All of lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH V14 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64
@ 2017-03-28 19:30 ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

When a memory error, CPU error, PCIe error, or other type of hardware error
that's covered by RAS occurs, firmware should populate the shared GHES memory
location with the proper GHES structures to notify the OS of the error.
For example, platforms that implement firmware first handling may implement
separate GHES sources for corrected errors and uncorrected errors. If the
error is an uncorrectable error, then the firmware will notify the OS
immediately since the error needs to be handled ASAP. The OS will then be able
to take the appropriate action needed such as offlining a page. If the error
is a corrected error, then the firmware will not interrupt the OS immediately.
Instead, the OS will see and report the error the next time it's GHES timer
expires. The kernel will first parse the GHES structures and report the errors
through the kernel logs and then notify the user space through RAS trace
events. This allows user space applications such as RAS Daemon to see the
errors and report them however the user desires. This patchset extends the
kernel functionality for RAS errors based on updates in the UEFI 2.6 and
ACPI 6.1 specifications.

An example flow from firmware to user space could be:

                 +---------------+
       +-------->|               |
       |         |  GHES polling |--+
+-------------+  |    source     |  |   +---------------+   +------------+
|             |  +---------------+  |   |  Kernel GHES  |   |            |
|  Firmware   |                     +-->|  CPER AER and |-->|  RAS trace |
|             |  +---------------+  |   |  EDAC drivers |   |   event    |
+-------------+  |               |  |   +---------------+   +------------+
       |         |  GHES sci     |--+
       +-------->|   source      |
                 +---------------+

Add support for Generic Hardware Error Source (GHES) v2, which introduces the
capability for the OS to acknowledge the consumption of the error record
generated by the Reliability, Availability and Serviceability (RAS) controller.
This eliminates potential race conditions between the OS and the RAS controller.

Add support for the timestamp field added to the Generic Error Data Entry v3,
allowing the OS to log the time that the error is generated by the firmware,
rather than the time the error is consumed. This improves the correctness of
event sequences when analyzing error logs. The timestamp is added in
ACPI 6.1, reference Table 18-343 Generic Error Data Entry.

Add support for ARMv8 Common Platform Error Record (CPER) per UEFI 2.6
specification. ARMv8 specific processor error information is reported as part of
the CPER records.  This provides more detail on for processor error logs. This
can help describe ARMv8 cache, tlb, and bus errors.

Synchronous External Abort (SEA) represents a specific processor error condition
in ARM systems. A handler is added to recognize SEA errors, and a notifier is
added to parse and report the errors before the process is killed. Refer to
section N.2.1.1 in the Common Platform Error Record appendix of the UEFI 2.6
specification.

Currently the kernel ignores CPER records that are unrecognized.
On the other hand, UEFI spec allows for non-standard (eg. vendor
proprietary) error section type in CPER (Common Platform Error Record),
as defined in section N2.3 of UEFI version 2.5. Therefore, user
is not able to see hardware error data of non-standard section.

If section Type field of Generic Error Data Entry is unrecognized,
prints out the raw data in dmesg buffer, and also adds a tracepoint
for reporting such hardware errors.

Currently even if an error status block's severity is fatal, the kernel
does not honor the severity level and panic. With the firmware first
model, the platform could inform the OS about a fatal hardware error
through the non-NMI GHES notification type. The OS should panic when a
hardware error record is received with this severity.

Add support to handle SEAs that occur while a KVM guest kernel is
running. Currently these are unsupported by the guest abort handling.

V14:Make sure function prototypes are in the __ASSEMBLY__ block
    Change is_abort_synchronous to is_abort_sea
    Use phys_addr_t for SEA address
    Return after successful SEA handling in handle_guest_abort()

V13:Rebase on 4.11rc2
    Print decimal and hex sizes for unknown CPER section errors
    Use proper CONFIG_* when using IS_ENABLED
    Move handle_guest_sea call prior to SEI check
    Add a return value to handle_guest_sea
    Move RCU locking into ghes_notify_sea
    Add valid bit checks to ARM trace event
    Remove GPIO, SEI, and GSIV cases in GHES
    Add ARCH_HAVE_NMI_SAFE_CMPXCHG since we added NMI usage

V12:Remove double quotes from CPER code
    Add helper function to check all SEA cases in KVM patch
    Replace nmi_enter/exit with rcu_read_lock/unlock for KVM SEA
    Change HAVE_ACPI_APEI_SEA to ACPI_APEI_SEA in KVM SEA case

V11:Change print_hex_dump calls to include ASCII output
    Change HAVE_ACPI_APEI_SEA to ACPI_APEI_SEA and make it 'default y'
    Add unknown print back when printing unknown CPER section
    Make sure to use "%s"" in CPER code
    Spacing fix when checking if SEA is enabled

V10:Fix spacing of trace event enabled if statement

V9: Move SEA_FnV_MASK to ESR_ELx_FnV
    Move HAVE_NMI into alphabetical order
    Remove duplicate hardirq.h include
    Only call ghes_notify_sea if HAVE_ACPI_APEI_SEA
    Make ACPI_APEI_SEA depend on ACPI_APEI_GHES
    Use phys_addr_t for physical address variable
    Make ghes_sea_add() return void
    Add include guard to ghes.h
    Verify HAVE_RAS before calling ras trace events
    Call __ghes_print_estatus() before __ghes_call_panic()
    Add trace_*_event_enabled() checks for both new trace events

V8: Remove SEA notifier
    Add FAR not valid bit check when populating the SEA error address
    Move nmi_enter/exit() to architecture specific code
    Add synchronize_rcu() usage to SEA handling
    Make GHES_IOREMAP_PAGES always 2
    Update ghes_ioremap_pfn_nmi() to work like ghes_ioremap_pfn_irq()
    Remove the SEA print from handle_guest_sea()

V7: Update a couple prints for ARM processor errors
    Add Print notifying if overflow occurred for ARM processor errors
    Check for ARM configuration to allow the compiler to ignore ARM code
     on non-ARM systems
    Use SEA acronym instead of spelling it out
    Update fault_info prints to be more clear
    Add NMI locking to SEA notification
    Remove error info structure from ARM trace event since there can be
     a variable amount of these structures

V6: Change HEST_TYPE_GENERIC_V2 to IS_HEST_TYPE_GENERIC_V2 for readability
    Move APEI helper defines from cper.h to ghes.h
    Add data_len decrement back into print loop
    Change references to ARMv8 to just ARM
    Rewrite ARM processor context info parsing
    Check valid bit of ARM error info field before printing it
    Add include of linux/uuid.h in ghes.c

V5: Fix GHES goto logic for error conditions
    Change ghes_do_read_ack to ghes_ack_error
    Make sure data version check is >= 3
    Use CPER helper functions in print functions
    Make handle_guest_sea() dummy function static for arm
    Add arm to subject line for KVM patch

V4: Add bit offset left shift to read_ack_write value
    Make HEST generic and generic_v2 structures a union in the ghes structure
    Move gdata v3 helper functions into ghes.h to avoid duplication
    Reorder the timestamp print and avoid memcpy
    Add helper functions for gdata size checking
    Rename the SEA functions
    Add helper function for GHES panics
    Set fru_id to NULL UUID at variable declaration
    Limit ARM trace event parameters to the needed structures
    Reorder the ARM trace event variables to save space
    Add comment for why we don't pass SEAs to the guest when it aborts
    Move ARM trace event call into GHES driver instead of CPER

V3: Fix unmapped address to the read_ack_register in ghes.c
    Add helper function to get the proper payload based on generic data entry
     version
    Move timestamp print to avoid changing function calls in cper.c
    Remove patch "arm64: exception: handle instruction abort at current EL"
     since the el1_ia handler is already added in 4.8
    Add EFI and ARM64 dependencies for HAVE_ACPI_APEI_SEA
    Add a new trace event for ARM type errors
    Add support to handle KVM guest SEAs

V2: Add PSCI state print for the ARMv8 error type.
    Separate timestamp year into year and century using BCD format.
    Rebase on top of ACPICA 20160318 release and remove header file changes
     in include/acpi/actbl1.h.
    Add panic OS with fatal error status block patch.
    Add processing of unrecognized CPER error section patches with updates
     from previous comments. Original patches: https://lkml.org/lkml/2015/9/8/646

V1: https://lkml.org/lkml/2016/2/5/544

Jonathan (Zhixiong) Zhang (1):
  acpi: apei: panic OS with fatal error status block

Tyler Baicar (9):
  acpi: apei: read ack upon ghes record consumption
  ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  efi: parse ARM processor error
  arm64: exception: handle Synchronous External Abort
  acpi: apei: handle SEA notification type for ARMv8
  efi: print unrecognized CPER section
  ras: acpi / apei: generate trace event for unrecognized CPER section
  trace, ras: add ARM processor error trace event
  arm/arm64: KVM: add guest SEA support

 arch/arm/include/asm/kvm_arm.h       |  10 ++
 arch/arm/include/asm/system_misc.h   |   5 +
 arch/arm/kvm/mmu.c                   |  34 +++++-
 arch/arm64/Kconfig                   |   2 +
 arch/arm64/include/asm/esr.h         |   1 +
 arch/arm64/include/asm/kvm_arm.h     |  10 ++
 arch/arm64/include/asm/system_misc.h |   2 +
 arch/arm64/mm/fault.c                |  75 +++++++++++--
 drivers/acpi/apei/Kconfig            |  15 +++
 drivers/acpi/apei/ghes.c             | 178 +++++++++++++++++++++++++----
 drivers/acpi/apei/hest.c             |   7 +-
 drivers/firmware/efi/cper.c          | 209 ++++++++++++++++++++++++++++++++---
 drivers/ras/ras.c                    |   2 +
 include/acpi/ghes.h                  |  34 +++++-
 include/linux/cper.h                 |  54 +++++++++
 include/ras/ras_event.h              |  90 +++++++++++++++
 16 files changed, 677 insertions(+), 51 deletions(-)

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64
@ 2017-03-28 19:30 ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

When a memory error, CPU error, PCIe error, or other type of hardware error
that's covered by RAS occurs, firmware should populate the shared GHES memory
location with the proper GHES structures to notify the OS of the error.
For example, platforms that implement firmware first handling may implement
separate GHES sources for corrected errors and uncorrected errors. If the
error is an uncorrectable error, then the firmware will notify the OS
immediately since the error needs to be handled ASAP. The OS will then be able
to take the appropriate action needed such as offlining a page. If the error
is a corrected error, then the firmware will not interrupt the OS immediately.
Instead, the OS will see and report the error the next time it's GHES timer
expires. The kernel will first parse the GHES structures and report the errors
through the kernel logs and then notify the user space through RAS trace
events. This allows user space applications such as RAS Daemon to see the
errors and report them however the user desires. This patchset extends the
kernel functionality for RAS errors based on updates in the UEFI 2.6 and
ACPI 6.1 specifications.

An example flow from firmware to user space could be:

                 +---------------+
       +-------->|               |
       |         |  GHES polling |--+
+-------------+  |    source     |  |   +---------------+   +------------+
|             |  +---------------+  |   |  Kernel GHES  |   |            |
|  Firmware   |                     +-->|  CPER AER and |-->|  RAS trace |
|             |  +---------------+  |   |  EDAC drivers |   |   event    |
+-------------+  |               |  |   +---------------+   +------------+
       |         |  GHES sci     |--+
       +-------->|   source      |
                 +---------------+

Add support for Generic Hardware Error Source (GHES) v2, which introduces the
capability for the OS to acknowledge the consumption of the error record
generated by the Reliability, Availability and Serviceability (RAS) controller.
This eliminates potential race conditions between the OS and the RAS controller.

Add support for the timestamp field added to the Generic Error Data Entry v3,
allowing the OS to log the time that the error is generated by the firmware,
rather than the time the error is consumed. This improves the correctness of
event sequences when analyzing error logs. The timestamp is added in
ACPI 6.1, reference Table 18-343 Generic Error Data Entry.

Add support for ARMv8 Common Platform Error Record (CPER) per UEFI 2.6
specification. ARMv8 specific processor error information is reported as part of
the CPER records.  This provides more detail on for processor error logs. This
can help describe ARMv8 cache, tlb, and bus errors.

Synchronous External Abort (SEA) represents a specific processor error condition
in ARM systems. A handler is added to recognize SEA errors, and a notifier is
added to parse and report the errors before the process is killed. Refer to
section N.2.1.1 in the Common Platform Error Record appendix of the UEFI 2.6
specification.

Currently the kernel ignores CPER records that are unrecognized.
On the other hand, UEFI spec allows for non-standard (eg. vendor
proprietary) error section type in CPER (Common Platform Error Record),
as defined in section N2.3 of UEFI version 2.5. Therefore, user
is not able to see hardware error data of non-standard section.

If section Type field of Generic Error Data Entry is unrecognized,
prints out the raw data in dmesg buffer, and also adds a tracepoint
for reporting such hardware errors.

Currently even if an error status block's severity is fatal, the kernel
does not honor the severity level and panic. With the firmware first
model, the platform could inform the OS about a fatal hardware error
through the non-NMI GHES notification type. The OS should panic when a
hardware error record is received with this severity.

Add support to handle SEAs that occur while a KVM guest kernel is
running. Currently these are unsupported by the guest abort handling.

V14:Make sure function prototypes are in the __ASSEMBLY__ block
    Change is_abort_synchronous to is_abort_sea
    Use phys_addr_t for SEA address
    Return after successful SEA handling in handle_guest_abort()

V13:Rebase on 4.11rc2
    Print decimal and hex sizes for unknown CPER section errors
    Use proper CONFIG_* when using IS_ENABLED
    Move handle_guest_sea call prior to SEI check
    Add a return value to handle_guest_sea
    Move RCU locking into ghes_notify_sea
    Add valid bit checks to ARM trace event
    Remove GPIO, SEI, and GSIV cases in GHES
    Add ARCH_HAVE_NMI_SAFE_CMPXCHG since we added NMI usage

V12:Remove double quotes from CPER code
    Add helper function to check all SEA cases in KVM patch
    Replace nmi_enter/exit with rcu_read_lock/unlock for KVM SEA
    Change HAVE_ACPI_APEI_SEA to ACPI_APEI_SEA in KVM SEA case

V11:Change print_hex_dump calls to include ASCII output
    Change HAVE_ACPI_APEI_SEA to ACPI_APEI_SEA and make it 'default y'
    Add unknown print back when printing unknown CPER section
    Make sure to use "%s"" in CPER code
    Spacing fix when checking if SEA is enabled

V10:Fix spacing of trace event enabled if statement

V9: Move SEA_FnV_MASK to ESR_ELx_FnV
    Move HAVE_NMI into alphabetical order
    Remove duplicate hardirq.h include
    Only call ghes_notify_sea if HAVE_ACPI_APEI_SEA
    Make ACPI_APEI_SEA depend on ACPI_APEI_GHES
    Use phys_addr_t for physical address variable
    Make ghes_sea_add() return void
    Add include guard to ghes.h
    Verify HAVE_RAS before calling ras trace events
    Call __ghes_print_estatus() before __ghes_call_panic()
    Add trace_*_event_enabled() checks for both new trace events

V8: Remove SEA notifier
    Add FAR not valid bit check when populating the SEA error address
    Move nmi_enter/exit() to architecture specific code
    Add synchronize_rcu() usage to SEA handling
    Make GHES_IOREMAP_PAGES always 2
    Update ghes_ioremap_pfn_nmi() to work like ghes_ioremap_pfn_irq()
    Remove the SEA print from handle_guest_sea()

V7: Update a couple prints for ARM processor errors
    Add Print notifying if overflow occurred for ARM processor errors
    Check for ARM configuration to allow the compiler to ignore ARM code
     on non-ARM systems
    Use SEA acronym instead of spelling it out
    Update fault_info prints to be more clear
    Add NMI locking to SEA notification
    Remove error info structure from ARM trace event since there can be
     a variable amount of these structures

V6: Change HEST_TYPE_GENERIC_V2 to IS_HEST_TYPE_GENERIC_V2 for readability
    Move APEI helper defines from cper.h to ghes.h
    Add data_len decrement back into print loop
    Change references to ARMv8 to just ARM
    Rewrite ARM processor context info parsing
    Check valid bit of ARM error info field before printing it
    Add include of linux/uuid.h in ghes.c

V5: Fix GHES goto logic for error conditions
    Change ghes_do_read_ack to ghes_ack_error
    Make sure data version check is >= 3
    Use CPER helper functions in print functions
    Make handle_guest_sea() dummy function static for arm
    Add arm to subject line for KVM patch

V4: Add bit offset left shift to read_ack_write value
    Make HEST generic and generic_v2 structures a union in the ghes structure
    Move gdata v3 helper functions into ghes.h to avoid duplication
    Reorder the timestamp print and avoid memcpy
    Add helper functions for gdata size checking
    Rename the SEA functions
    Add helper function for GHES panics
    Set fru_id to NULL UUID at variable declaration
    Limit ARM trace event parameters to the needed structures
    Reorder the ARM trace event variables to save space
    Add comment for why we don't pass SEAs to the guest when it aborts
    Move ARM trace event call into GHES driver instead of CPER

V3: Fix unmapped address to the read_ack_register in ghes.c
    Add helper function to get the proper payload based on generic data entry
     version
    Move timestamp print to avoid changing function calls in cper.c
    Remove patch "arm64: exception: handle instruction abort at current EL"
     since the el1_ia handler is already added in 4.8
    Add EFI and ARM64 dependencies for HAVE_ACPI_APEI_SEA
    Add a new trace event for ARM type errors
    Add support to handle KVM guest SEAs

V2: Add PSCI state print for the ARMv8 error type.
    Separate timestamp year into year and century using BCD format.
    Rebase on top of ACPICA 20160318 release and remove header file changes
     in include/acpi/actbl1.h.
    Add panic OS with fatal error status block patch.
    Add processing of unrecognized CPER error section patches with updates
     from previous comments. Original patches: https://lkml.org/lkml/2015/9/8/646

V1: https://lkml.org/lkml/2016/2/5/544

Jonathan (Zhixiong) Zhang (1):
  acpi: apei: panic OS with fatal error status block

Tyler Baicar (9):
  acpi: apei: read ack upon ghes record consumption
  ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  efi: parse ARM processor error
  arm64: exception: handle Synchronous External Abort
  acpi: apei: handle SEA notification type for ARMv8
  efi: print unrecognized CPER section
  ras: acpi / apei: generate trace event for unrecognized CPER section
  trace, ras: add ARM processor error trace event
  arm/arm64: KVM: add guest SEA support

 arch/arm/include/asm/kvm_arm.h       |  10 ++
 arch/arm/include/asm/system_misc.h   |   5 +
 arch/arm/kvm/mmu.c                   |  34 +++++-
 arch/arm64/Kconfig                   |   2 +
 arch/arm64/include/asm/esr.h         |   1 +
 arch/arm64/include/asm/kvm_arm.h     |  10 ++
 arch/arm64/include/asm/system_misc.h |   2 +
 arch/arm64/mm/fault.c                |  75 +++++++++++--
 drivers/acpi/apei/Kconfig            |  15 +++
 drivers/acpi/apei/ghes.c             | 178 +++++++++++++++++++++++++----
 drivers/acpi/apei/hest.c             |   7 +-
 drivers/firmware/efi/cper.c          | 209 ++++++++++++++++++++++++++++++++---
 drivers/ras/ras.c                    |   2 +
 include/acpi/ghes.h                  |  34 +++++-
 include/linux/cper.h                 |  54 +++++++++
 include/ras/ras_event.h              |  90 +++++++++++++++
 16 files changed, 677 insertions(+), 51 deletions(-)

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64
@ 2017-03-28 19:30 ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

When a memory error, CPU error, PCIe error, or other type of hardware error
that's covered by RAS occurs, firmware should populate the shared GHES memory
location with the proper GHES structures to notify the OS of the error.
For example, platforms that implement firmware first handling may implement
separate GHES sources for corrected errors and uncorrected errors. If the
error is an uncorrectable error, then the firmware will notify the OS
immediately since the error needs to be handled ASAP. The OS will then be able
to take the appropriate action needed such as offlining a page. If the error
is a corrected error, then the firmware will not interrupt the OS immediately.
Instead, the OS will see and report the error the next time it's GHES timer
expires. The kernel will first parse the GHES structures and report the errors
through the kernel logs and then notify the user space through RAS trace
events. This allows user space applications such as RAS Daemon to see the
errors and report them however the user desires. This patchset extends the
kernel functionality for RAS errors based on updates in the UEFI 2.6 and
ACPI 6.1 specifications.

An example flow from firmware to user space could be:

                 +---------------+
       +-------->|               |
       |         |  GHES polling |--+
+-------------+  |    source     |  |   +---------------+   +------------+
|             |  +---------------+  |   |  Kernel GHES  |   |            |
|  Firmware   |                     +-->|  CPER AER and |-->|  RAS trace |
|             |  +---------------+  |   |  EDAC drivers |   |   event    |
+-------------+  |               |  |   +---------------+   +------------+
       |         |  GHES sci     |--+
       +-------->|   source      |
                 +---------------+

Add support for Generic Hardware Error Source (GHES) v2, which introduces the
capability for the OS to acknowledge the consumption of the error record
generated by the Reliability, Availability and Serviceability (RAS) controller.
This eliminates potential race conditions between the OS and the RAS controller.

Add support for the timestamp field added to the Generic Error Data Entry v3,
allowing the OS to log the time that the error is generated by the firmware,
rather than the time the error is consumed. This improves the correctness of
event sequences when analyzing error logs. The timestamp is added in
ACPI 6.1, reference Table 18-343 Generic Error Data Entry.

Add support for ARMv8 Common Platform Error Record (CPER) per UEFI 2.6
specification. ARMv8 specific processor error information is reported as part of
the CPER records.  This provides more detail on for processor error logs. This
can help describe ARMv8 cache, tlb, and bus errors.

Synchronous External Abort (SEA) represents a specific processor error condition
in ARM systems. A handler is added to recognize SEA errors, and a notifier is
added to parse and report the errors before the process is killed. Refer to
section N.2.1.1 in the Common Platform Error Record appendix of the UEFI 2.6
specification.

Currently the kernel ignores CPER records that are unrecognized.
On the other hand, UEFI spec allows for non-standard (eg. vendor
proprietary) error section type in CPER (Common Platform Error Record),
as defined in section N2.3 of UEFI version 2.5. Therefore, user
is not able to see hardware error data of non-standard section.

If section Type field of Generic Error Data Entry is unrecognized,
prints out the raw data in dmesg buffer, and also adds a tracepoint
for reporting such hardware errors.

Currently even if an error status block's severity is fatal, the kernel
does not honor the severity level and panic. With the firmware first
model, the platform could inform the OS about a fatal hardware error
through the non-NMI GHES notification type. The OS should panic when a
hardware error record is received with this severity.

Add support to handle SEAs that occur while a KVM guest kernel is
running. Currently these are unsupported by the guest abort handling.

V14:Make sure function prototypes are in the __ASSEMBLY__ block
    Change is_abort_synchronous to is_abort_sea
    Use phys_addr_t for SEA address
    Return after successful SEA handling in handle_guest_abort()

V13:Rebase on 4.11rc2
    Print decimal and hex sizes for unknown CPER section errors
    Use proper CONFIG_* when using IS_ENABLED
    Move handle_guest_sea call prior to SEI check
    Add a return value to handle_guest_sea
    Move RCU locking into ghes_notify_sea
    Add valid bit checks to ARM trace event
    Remove GPIO, SEI, and GSIV cases in GHES
    Add ARCH_HAVE_NMI_SAFE_CMPXCHG since we added NMI usage

V12:Remove double quotes from CPER code
    Add helper function to check all SEA cases in KVM patch
    Replace nmi_enter/exit with rcu_read_lock/unlock for KVM SEA
    Change HAVE_ACPI_APEI_SEA to ACPI_APEI_SEA in KVM SEA case

V11:Change print_hex_dump calls to include ASCII output
    Change HAVE_ACPI_APEI_SEA to ACPI_APEI_SEA and make it 'default y'
    Add unknown print back when printing unknown CPER section
    Make sure to use "%s"" in CPER code
    Spacing fix when checking if SEA is enabled

V10:Fix spacing of trace event enabled if statement

V9: Move SEA_FnV_MASK to ESR_ELx_FnV
    Move HAVE_NMI into alphabetical order
    Remove duplicate hardirq.h include
    Only call ghes_notify_sea if HAVE_ACPI_APEI_SEA
    Make ACPI_APEI_SEA depend on ACPI_APEI_GHES
    Use phys_addr_t for physical address variable
    Make ghes_sea_add() return void
    Add include guard to ghes.h
    Verify HAVE_RAS before calling ras trace events
    Call __ghes_print_estatus() before __ghes_call_panic()
    Add trace_*_event_enabled() checks for both new trace events

V8: Remove SEA notifier
    Add FAR not valid bit check when populating the SEA error address
    Move nmi_enter/exit() to architecture specific code
    Add synchronize_rcu() usage to SEA handling
    Make GHES_IOREMAP_PAGES always 2
    Update ghes_ioremap_pfn_nmi() to work like ghes_ioremap_pfn_irq()
    Remove the SEA print from handle_guest_sea()

V7: Update a couple prints for ARM processor errors
    Add Print notifying if overflow occurred for ARM processor errors
    Check for ARM configuration to allow the compiler to ignore ARM code
     on non-ARM systems
    Use SEA acronym instead of spelling it out
    Update fault_info prints to be more clear
    Add NMI locking to SEA notification
    Remove error info structure from ARM trace event since there can be
     a variable amount of these structures

V6: Change HEST_TYPE_GENERIC_V2 to IS_HEST_TYPE_GENERIC_V2 for readability
    Move APEI helper defines from cper.h to ghes.h
    Add data_len decrement back into print loop
    Change references to ARMv8 to just ARM
    Rewrite ARM processor context info parsing
    Check valid bit of ARM error info field before printing it
    Add include of linux/uuid.h in ghes.c

V5: Fix GHES goto logic for error conditions
    Change ghes_do_read_ack to ghes_ack_error
    Make sure data version check is >= 3
    Use CPER helper functions in print functions
    Make handle_guest_sea() dummy function static for arm
    Add arm to subject line for KVM patch

V4: Add bit offset left shift to read_ack_write value
    Make HEST generic and generic_v2 structures a union in the ghes structure
    Move gdata v3 helper functions into ghes.h to avoid duplication
    Reorder the timestamp print and avoid memcpy
    Add helper functions for gdata size checking
    Rename the SEA functions
    Add helper function for GHES panics
    Set fru_id to NULL UUID at variable declaration
    Limit ARM trace event parameters to the needed structures
    Reorder the ARM trace event variables to save space
    Add comment for why we don't pass SEAs to the guest when it aborts
    Move ARM trace event call into GHES driver instead of CPER

V3: Fix unmapped address to the read_ack_register in ghes.c
    Add helper function to get the proper payload based on generic data entry
     version
    Move timestamp print to avoid changing function calls in cper.c
    Remove patch "arm64: exception: handle instruction abort at current EL"
     since the el1_ia handler is already added in 4.8
    Add EFI and ARM64 dependencies for HAVE_ACPI_APEI_SEA
    Add a new trace event for ARM type errors
    Add support to handle KVM guest SEAs

V2: Add PSCI state print for the ARMv8 error type.
    Separate timestamp year into year and century using BCD format.
    Rebase on top of ACPICA 20160318 release and remove header file changes
     in include/acpi/actbl1.h.
    Add panic OS with fatal error status block patch.
    Add processing of unrecognized CPER error section patches with updates
     from previous comments. Original patches: https://lkml.org/lkml/2015/9/8/646

V1: https://lkml.org/lkml/2016/2/5/544

Jonathan (Zhixiong) Zhang (1):
  acpi: apei: panic OS with fatal error status block

Tyler Baicar (9):
  acpi: apei: read ack upon ghes record consumption
  ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  efi: parse ARM processor error
  arm64: exception: handle Synchronous External Abort
  acpi: apei: handle SEA notification type for ARMv8
  efi: print unrecognized CPER section
  ras: acpi / apei: generate trace event for unrecognized CPER section
  trace, ras: add ARM processor error trace event
  arm/arm64: KVM: add guest SEA support

 arch/arm/include/asm/kvm_arm.h       |  10 ++
 arch/arm/include/asm/system_misc.h   |   5 +
 arch/arm/kvm/mmu.c                   |  34 +++++-
 arch/arm64/Kconfig                   |   2 +
 arch/arm64/include/asm/esr.h         |   1 +
 arch/arm64/include/asm/kvm_arm.h     |  10 ++
 arch/arm64/include/asm/system_misc.h |   2 +
 arch/arm64/mm/fault.c                |  75 +++++++++++--
 drivers/acpi/apei/Kconfig            |  15 +++
 drivers/acpi/apei/ghes.c             | 178 +++++++++++++++++++++++++----
 drivers/acpi/apei/hest.c             |   7 +-
 drivers/firmware/efi/cper.c          | 209 ++++++++++++++++++++++++++++++++---
 drivers/ras/ras.c                    |   2 +
 include/acpi/ghes.h                  |  34 +++++-
 include/linux/cper.h                 |  54 +++++++++
 include/ras/ras_event.h              |  90 +++++++++++++++
 16 files changed, 677 insertions(+), 51 deletions(-)

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

A RAS (Reliability, Availability, Serviceability) controller
may be a separate processor running in parallel with OS
execution, and may generate error records for consumption by
the OS. If the RAS controller produces multiple error records,
then they may be overwritten before the OS has consumed them.

The Generic Hardware Error Source (GHES) v2 structure
introduces the capability for the OS to acknowledge the
consumption of the error record generated by the RAS
controller. A RAS controller supporting GHESv2 shall wait for
the acknowledgment before writing a new error record, thus
eliminating the race condition.

Add support for parsing of GHESv2 sub-tables as well.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
 drivers/acpi/apei/hest.c |  7 +++++--
 include/acpi/ghes.h      |  5 ++++-
 3 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index b192b42..0241e36 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -46,6 +46,7 @@
 #include <linux/nmi.h>
 #include <linux/sched/clock.h>
 
+#include <acpi/actbl1.h>
 #include <acpi/ghes.h>
 #include <acpi/apei.h>
 #include <asm/tlbflush.h>
@@ -80,6 +81,10 @@
 	((struct acpi_hest_generic_status *)				\
 	 ((struct ghes_estatus_node *)(estatus_node) + 1))
 
+#define IS_HEST_TYPE_GENERIC_V2(ghes)				\
+	((struct acpi_hest_header *)ghes->generic)->type ==	\
+	 ACPI_HEST_TYPE_GENERIC_ERROR_V2
+
 /*
  * This driver isn't really modular, however for the time being,
  * continuing to use module_param is the easiest way to remain
@@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
 	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
 	if (!ghes)
 		return ERR_PTR(-ENOMEM);
+
 	ghes->generic = generic;
+	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
+		rc = apei_map_generic_address(
+			&ghes->generic_v2->read_ack_register);
+		if (rc)
+			goto err_free;
+	}
+
 	rc = apei_map_generic_address(&generic->error_status_address);
 	if (rc)
-		goto err_free;
+		goto err_unmap_read_ack_addr;
 	error_block_length = generic->error_block_length;
 	if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
 		pr_warning(FW_WARN GHES_PFX
@@ -264,13 +277,17 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
 	ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
 	if (!ghes->estatus) {
 		rc = -ENOMEM;
-		goto err_unmap;
+		goto err_unmap_status_addr;
 	}
 
 	return ghes;
 
-err_unmap:
+err_unmap_status_addr:
 	apei_unmap_generic_address(&generic->error_status_address);
+err_unmap_read_ack_addr:
+	if (IS_HEST_TYPE_GENERIC_V2(ghes))
+		apei_unmap_generic_address(
+			&ghes->generic_v2->read_ack_register);
 err_free:
 	kfree(ghes);
 	return ERR_PTR(rc);
@@ -280,6 +297,9 @@ static void ghes_fini(struct ghes *ghes)
 {
 	kfree(ghes->estatus);
 	apei_unmap_generic_address(&ghes->generic->error_status_address);
+	if (IS_HEST_TYPE_GENERIC_V2(ghes))
+		apei_unmap_generic_address(
+			&ghes->generic_v2->read_ack_register);
 }
 
 static inline int ghes_severity(int severity)
@@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
 	rcu_read_unlock();
 }
 
+static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
+{
+	int rc;
+	u64 val = 0;
+
+	rc = apei_read(&val, &generic_v2->read_ack_register);
+	if (rc)
+		return rc;
+	val &= generic_v2->read_ack_preserve <<
+		generic_v2->read_ack_register.bit_offset;
+	val |= generic_v2->read_ack_write <<
+		generic_v2->read_ack_register.bit_offset;
+	rc = apei_write(val, &generic_v2->read_ack_register);
+
+	return rc;
+}
+
 static int ghes_proc(struct ghes *ghes)
 {
 	int rc;
@@ -661,6 +698,12 @@ static int ghes_proc(struct ghes *ghes)
 			ghes_estatus_cache_add(ghes->generic, ghes->estatus);
 	}
 	ghes_do_proc(ghes, ghes->estatus);
+
+	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
+		rc = ghes_ack_error(ghes->generic_v2);
+		if (rc)
+			return rc;
+	}
 out:
 	ghes_clear_estatus(ghes);
 	return rc;
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index 8f2a98e..456b488 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -52,6 +52,7 @@
 	[ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
 	[ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
 	[ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
+	[ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
 };
 
 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
@@ -141,7 +142,8 @@ static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void
 {
 	int *count = data;
 
-	if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
+	if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
+	    hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
 		(*count)++;
 	return 0;
 }
@@ -152,7 +154,8 @@ static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
 	struct ghes_arr *ghes_arr = data;
 	int rc, i;
 
-	if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
+	if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
+	    hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
 		return 0;
 
 	if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 720446c..68f088a 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -13,7 +13,10 @@
 #define GHES_EXITING		0x0002
 
 struct ghes {
-	struct acpi_hest_generic *generic;
+	union {
+		struct acpi_hest_generic *generic;
+		struct acpi_hest_generic_v2 *generic_v2;
+	};
 	struct acpi_hest_generic_status *estatus;
 	u64 buffer_paddr;
 	unsigned long flags;
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

A RAS (Reliability, Availability, Serviceability) controller
may be a separate processor running in parallel with OS
execution, and may generate error records for consumption by
the OS. If the RAS controller produces multiple error records,
then they may be overwritten before the OS has consumed them.

The Generic Hardware Error Source (GHES) v2 structure
introduces the capability for the OS to acknowledge the
consumption of the error record generated by the RAS
controller. A RAS controller supporting GHESv2 shall wait for
the acknowledgment before writing a new error record, thus
eliminating the race condition.

Add support for parsing of GHESv2 sub-tables as well.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
 drivers/acpi/apei/hest.c |  7 +++++--
 include/acpi/ghes.h      |  5 ++++-
 3 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index b192b42..0241e36 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -46,6 +46,7 @@
 #include <linux/nmi.h>
 #include <linux/sched/clock.h>
 
+#include <acpi/actbl1.h>
 #include <acpi/ghes.h>
 #include <acpi/apei.h>
 #include <asm/tlbflush.h>
@@ -80,6 +81,10 @@
 	((struct acpi_hest_generic_status *)				\
 	 ((struct ghes_estatus_node *)(estatus_node) + 1))
 
+#define IS_HEST_TYPE_GENERIC_V2(ghes)				\
+	((struct acpi_hest_header *)ghes->generic)->type ==	\
+	 ACPI_HEST_TYPE_GENERIC_ERROR_V2
+
 /*
  * This driver isn't really modular, however for the time being,
  * continuing to use module_param is the easiest way to remain
@@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
 	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
 	if (!ghes)
 		return ERR_PTR(-ENOMEM);
+
 	ghes->generic = generic;
+	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
+		rc = apei_map_generic_address(
+			&ghes->generic_v2->read_ack_register);
+		if (rc)
+			goto err_free;
+	}
+
 	rc = apei_map_generic_address(&generic->error_status_address);
 	if (rc)
-		goto err_free;
+		goto err_unmap_read_ack_addr;
 	error_block_length = generic->error_block_length;
 	if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
 		pr_warning(FW_WARN GHES_PFX
@@ -264,13 +277,17 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
 	ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
 	if (!ghes->estatus) {
 		rc = -ENOMEM;
-		goto err_unmap;
+		goto err_unmap_status_addr;
 	}
 
 	return ghes;
 
-err_unmap:
+err_unmap_status_addr:
 	apei_unmap_generic_address(&generic->error_status_address);
+err_unmap_read_ack_addr:
+	if (IS_HEST_TYPE_GENERIC_V2(ghes))
+		apei_unmap_generic_address(
+			&ghes->generic_v2->read_ack_register);
 err_free:
 	kfree(ghes);
 	return ERR_PTR(rc);
@@ -280,6 +297,9 @@ static void ghes_fini(struct ghes *ghes)
 {
 	kfree(ghes->estatus);
 	apei_unmap_generic_address(&ghes->generic->error_status_address);
+	if (IS_HEST_TYPE_GENERIC_V2(ghes))
+		apei_unmap_generic_address(
+			&ghes->generic_v2->read_ack_register);
 }
 
 static inline int ghes_severity(int severity)
@@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
 	rcu_read_unlock();
 }
 
+static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
+{
+	int rc;
+	u64 val = 0;
+
+	rc = apei_read(&val, &generic_v2->read_ack_register);
+	if (rc)
+		return rc;
+	val &= generic_v2->read_ack_preserve <<
+		generic_v2->read_ack_register.bit_offset;
+	val |= generic_v2->read_ack_write <<
+		generic_v2->read_ack_register.bit_offset;
+	rc = apei_write(val, &generic_v2->read_ack_register);
+
+	return rc;
+}
+
 static int ghes_proc(struct ghes *ghes)
 {
 	int rc;
@@ -661,6 +698,12 @@ static int ghes_proc(struct ghes *ghes)
 			ghes_estatus_cache_add(ghes->generic, ghes->estatus);
 	}
 	ghes_do_proc(ghes, ghes->estatus);
+
+	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
+		rc = ghes_ack_error(ghes->generic_v2);
+		if (rc)
+			return rc;
+	}
 out:
 	ghes_clear_estatus(ghes);
 	return rc;
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index 8f2a98e..456b488 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -52,6 +52,7 @@
 	[ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
 	[ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
 	[ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
+	[ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
 };
 
 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
@@ -141,7 +142,8 @@ static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void
 {
 	int *count = data;
 
-	if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
+	if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
+	    hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
 		(*count)++;
 	return 0;
 }
@@ -152,7 +154,8 @@ static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
 	struct ghes_arr *ghes_arr = data;
 	int rc, i;
 
-	if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
+	if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
+	    hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
 		return 0;
 
 	if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 720446c..68f088a 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -13,7 +13,10 @@
 #define GHES_EXITING		0x0002
 
 struct ghes {
-	struct acpi_hest_generic *generic;
+	union {
+		struct acpi_hest_generic *generic;
+		struct acpi_hest_generic_v2 *generic_v2;
+	};
 	struct acpi_hest_generic_status *estatus;
 	u64 buffer_paddr;
 	unsigned long flags;
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

A RAS (Reliability, Availability, Serviceability) controller
may be a separate processor running in parallel with OS
execution, and may generate error records for consumption by
the OS. If the RAS controller produces multiple error records,
then they may be overwritten before the OS has consumed them.

The Generic Hardware Error Source (GHES) v2 structure
introduces the capability for the OS to acknowledge the
consumption of the error record generated by the RAS
controller. A RAS controller supporting GHESv2 shall wait for
the acknowledgment before writing a new error record, thus
eliminating the race condition.

Add support for parsing of GHESv2 sub-tables as well.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
 drivers/acpi/apei/hest.c |  7 +++++--
 include/acpi/ghes.h      |  5 ++++-
 3 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index b192b42..0241e36 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -46,6 +46,7 @@
 #include <linux/nmi.h>
 #include <linux/sched/clock.h>
 
+#include <acpi/actbl1.h>
 #include <acpi/ghes.h>
 #include <acpi/apei.h>
 #include <asm/tlbflush.h>
@@ -80,6 +81,10 @@
 	((struct acpi_hest_generic_status *)				\
 	 ((struct ghes_estatus_node *)(estatus_node) + 1))
 
+#define IS_HEST_TYPE_GENERIC_V2(ghes)				\
+	((struct acpi_hest_header *)ghes->generic)->type ==	\
+	 ACPI_HEST_TYPE_GENERIC_ERROR_V2
+
 /*
  * This driver isn't really modular, however for the time being,
  * continuing to use module_param is the easiest way to remain
@@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
 	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
 	if (!ghes)
 		return ERR_PTR(-ENOMEM);
+
 	ghes->generic = generic;
+	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
+		rc = apei_map_generic_address(
+			&ghes->generic_v2->read_ack_register);
+		if (rc)
+			goto err_free;
+	}
+
 	rc = apei_map_generic_address(&generic->error_status_address);
 	if (rc)
-		goto err_free;
+		goto err_unmap_read_ack_addr;
 	error_block_length = generic->error_block_length;
 	if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
 		pr_warning(FW_WARN GHES_PFX
@@ -264,13 +277,17 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
 	ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
 	if (!ghes->estatus) {
 		rc = -ENOMEM;
-		goto err_unmap;
+		goto err_unmap_status_addr;
 	}
 
 	return ghes;
 
-err_unmap:
+err_unmap_status_addr:
 	apei_unmap_generic_address(&generic->error_status_address);
+err_unmap_read_ack_addr:
+	if (IS_HEST_TYPE_GENERIC_V2(ghes))
+		apei_unmap_generic_address(
+			&ghes->generic_v2->read_ack_register);
 err_free:
 	kfree(ghes);
 	return ERR_PTR(rc);
@@ -280,6 +297,9 @@ static void ghes_fini(struct ghes *ghes)
 {
 	kfree(ghes->estatus);
 	apei_unmap_generic_address(&ghes->generic->error_status_address);
+	if (IS_HEST_TYPE_GENERIC_V2(ghes))
+		apei_unmap_generic_address(
+			&ghes->generic_v2->read_ack_register);
 }
 
 static inline int ghes_severity(int severity)
@@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
 	rcu_read_unlock();
 }
 
+static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
+{
+	int rc;
+	u64 val = 0;
+
+	rc = apei_read(&val, &generic_v2->read_ack_register);
+	if (rc)
+		return rc;
+	val &= generic_v2->read_ack_preserve <<
+		generic_v2->read_ack_register.bit_offset;
+	val |= generic_v2->read_ack_write <<
+		generic_v2->read_ack_register.bit_offset;
+	rc = apei_write(val, &generic_v2->read_ack_register);
+
+	return rc;
+}
+
 static int ghes_proc(struct ghes *ghes)
 {
 	int rc;
@@ -661,6 +698,12 @@ static int ghes_proc(struct ghes *ghes)
 			ghes_estatus_cache_add(ghes->generic, ghes->estatus);
 	}
 	ghes_do_proc(ghes, ghes->estatus);
+
+	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
+		rc = ghes_ack_error(ghes->generic_v2);
+		if (rc)
+			return rc;
+	}
 out:
 	ghes_clear_estatus(ghes);
 	return rc;
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index 8f2a98e..456b488 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -52,6 +52,7 @@
 	[ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
 	[ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
 	[ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
+	[ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
 };
 
 static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
@@ -141,7 +142,8 @@ static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void
 {
 	int *count = data;
 
-	if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR)
+	if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
+	    hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
 		(*count)++;
 	return 0;
 }
@@ -152,7 +154,8 @@ static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
 	struct ghes_arr *ghes_arr = data;
 	int rc, i;
 
-	if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR)
+	if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
+	    hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
 		return 0;
 
 	if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 720446c..68f088a 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -13,7 +13,10 @@
 #define GHES_EXITING		0x0002
 
 struct ghes {
-	struct acpi_hest_generic *generic;
+	union {
+		struct acpi_hest_generic *generic;
+		struct acpi_hest_generic_v2 *generic_v2;
+	};
 	struct acpi_hest_generic_status *estatus;
 	u64 buffer_paddr;
 	unsigned long flags;
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  2017-03-28 19:30 ` Tyler Baicar
  (?)
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi
  Cc: Tyler Baicar

Currently when a RAS error is reported it is not timestamped.
The ACPI 6.1 spec adds the timestamp field to the generic error
data entry v3 structure. The timestamp of when the firmware
generated the error is now being reported.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 drivers/acpi/apei/ghes.c    |  9 ++++---
 drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
 include/acpi/ghes.h         | 22 ++++++++++++++++
 3 files changed, 77 insertions(+), 17 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 0241e36..9ddbb93 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
 	int flags = -1;
 	int sec_sev = ghes_severity(gdata->error_severity);
 	struct cper_sec_mem_err *mem_err;
-	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
+
+	mem_err = acpi_hest_generic_data_payload(gdata);
 
 	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
 		return;
@@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
 		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
 				 CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem_err;
-			mem_err = (struct cper_sec_mem_err *)(gdata+1);
+
+			mem_err = acpi_hest_generic_data_payload(gdata);
 			ghes_edac_report_mem_error(ghes, sev, mem_err);
 
 			arch_apei_report_mem_error(sev, mem_err);
@@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
 		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
 				      CPER_SEC_PCIE)) {
 			struct cper_sec_pcie *pcie_err;
-			pcie_err = (struct cper_sec_pcie *)(gdata+1);
+
+			pcie_err = acpi_hest_generic_data_payload(gdata);
 			if (sev == GHES_SEV_RECOVERABLE &&
 			    sec_sev == GHES_SEV_RECOVERABLE &&
 			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index d425374..8fa4e23 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -32,6 +32,9 @@
 #include <linux/acpi.h>
 #include <linux/pci.h>
 #include <linux/aer.h>
+#include <linux/printk.h>
+#include <linux/bcd.h>
+#include <acpi/ghes.h>
 
 #define INDENT_SP	" "
 
@@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
 	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
 }
 
+static void cper_estatus_print_section_v300(const char *pfx,
+	const struct acpi_hest_generic_data_v300 *gdata)
+{
+	__u8 hour, min, sec, day, mon, year, century, *timestamp;
+
+	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
+		timestamp = (__u8 *)&(gdata->time_stamp);
+		sec = bcd2bin(timestamp[0]);
+		min = bcd2bin(timestamp[1]);
+		hour = bcd2bin(timestamp[2]);
+		day = bcd2bin(timestamp[4]);
+		mon = bcd2bin(timestamp[5]);
+		year = bcd2bin(timestamp[6]);
+		century = bcd2bin(timestamp[7]);
+		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
+			0x01 & *(timestamp + 3) ? "precise" : "", century,
+			year, mon, day, hour, min, sec);
+	}
+}
+
 static void cper_estatus_print_section(
-	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
+	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)
 {
 	uuid_le *sec_type = (uuid_le *)gdata->section_type;
 	__u16 severity;
 	char newpfx[64];
 
+	if (acpi_hest_generic_data_version(gdata) >= 3)
+		cper_estatus_print_section_v300(pfx,
+			(const struct acpi_hest_generic_data_v300 *)gdata);
+
 	severity = gdata->error_severity;
 	printk("%s""Error %d, type: %s\n", pfx, sec_no,
 	       cper_severity_str(severity));
@@ -403,14 +430,18 @@ static void cper_estatus_print_section(
 
 	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
 	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
-		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
+		struct cper_sec_proc_generic *proc_err;
+
+		proc_err = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: general processor error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*proc_err))
 			cper_print_proc_generic(newpfx, proc_err);
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
-		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
+		struct cper_sec_mem_err *mem_err;
+
+		mem_err = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: memory error\n", newpfx);
 		if (gdata->error_data_length >=
 		    sizeof(struct cper_sec_mem_err_old))
@@ -419,7 +450,9 @@ static void cper_estatus_print_section(
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
-		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
+		struct cper_sec_pcie *pcie;
+
+		pcie = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: PCIe error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*pcie))
 			cper_print_pcie(newpfx, pcie, gdata);
@@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
 			const struct acpi_hest_generic_status *estatus)
 {
 	struct acpi_hest_generic_data *gdata;
-	unsigned int data_len, gedata_len;
+	unsigned int data_len;
 	int sec_no = 0;
 	char newpfx[64];
 	__u16 severity;
@@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
 	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
+
 	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
-	while (data_len >= sizeof(*gdata)) {
-		gedata_len = gdata->error_data_length;
+
+	while (data_len >= acpi_hest_generic_data_size(gdata)) {
 		cper_estatus_print_section(newpfx, gdata, sec_no);
-		data_len -= gedata_len + sizeof(*gdata);
-		gdata = (void *)(gdata + 1) + gedata_len;
+		data_len -= acpi_hest_generic_data_record_size(gdata);
+		gdata = acpi_hest_generic_data_next(gdata);
 		sec_no++;
 	}
 }
@@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
 		return rc;
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
-	while (data_len >= sizeof(*gdata)) {
-		gedata_len = gdata->error_data_length;
-		if (gedata_len > data_len - sizeof(*gdata))
+
+	while (data_len >= acpi_hest_generic_data_size(gdata)) {
+		gedata_len = acpi_hest_generic_data_error_length(gdata);
+		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
 			return -EINVAL;
-		data_len -= gedata_len + sizeof(*gdata);
-		gdata = (void *)(gdata + 1) + gedata_len;
+		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
+		gdata = acpi_hest_generic_data_next(gdata);
 	}
 	if (data_len)
 		return -EINVAL;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 68f088a..6ae318b 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -12,6 +12,18 @@
 #define GHES_TO_CLEAR		0x0001
 #define GHES_EXITING		0x0002
 
+#define acpi_hest_generic_data_error_length(gdata)	\
+	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
+#define acpi_hest_generic_data_size(gdata)		\
+	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
+	sizeof(struct acpi_hest_generic_data_v300) :	\
+	sizeof(struct acpi_hest_generic_data))
+#define acpi_hest_generic_data_record_size(gdata)	\
+	(acpi_hest_generic_data_size(gdata) +		\
+	acpi_hest_generic_data_error_length(gdata))
+#define acpi_hest_generic_data_next(gdata)		\
+	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
+
 struct ghes {
 	union {
 		struct acpi_hest_generic *generic;
@@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
 {
 }
 #endif
+
+#define acpi_hest_generic_data_version(gdata)			\
+	(gdata->revision >> 8)
+
+static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
+{
+	return acpi_hest_generic_data_version(gdata) >= 3 ?
+		(void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1) :
+		gdata + 1;
+}
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.


^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

Currently when a RAS error is reported it is not timestamped.
The ACPI 6.1 spec adds the timestamp field to the generic error
data entry v3 structure. The timestamp of when the firmware
generated the error is now being reported.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 drivers/acpi/apei/ghes.c    |  9 ++++---
 drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
 include/acpi/ghes.h         | 22 ++++++++++++++++
 3 files changed, 77 insertions(+), 17 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 0241e36..9ddbb93 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
 	int flags = -1;
 	int sec_sev = ghes_severity(gdata->error_severity);
 	struct cper_sec_mem_err *mem_err;
-	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
+
+	mem_err = acpi_hest_generic_data_payload(gdata);
 
 	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
 		return;
@@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
 		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
 				 CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem_err;
-			mem_err = (struct cper_sec_mem_err *)(gdata+1);
+
+			mem_err = acpi_hest_generic_data_payload(gdata);
 			ghes_edac_report_mem_error(ghes, sev, mem_err);
 
 			arch_apei_report_mem_error(sev, mem_err);
@@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
 		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
 				      CPER_SEC_PCIE)) {
 			struct cper_sec_pcie *pcie_err;
-			pcie_err = (struct cper_sec_pcie *)(gdata+1);
+
+			pcie_err = acpi_hest_generic_data_payload(gdata);
 			if (sev == GHES_SEV_RECOVERABLE &&
 			    sec_sev == GHES_SEV_RECOVERABLE &&
 			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index d425374..8fa4e23 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -32,6 +32,9 @@
 #include <linux/acpi.h>
 #include <linux/pci.h>
 #include <linux/aer.h>
+#include <linux/printk.h>
+#include <linux/bcd.h>
+#include <acpi/ghes.h>
 
 #define INDENT_SP	" "
 
@@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
 	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
 }
 
+static void cper_estatus_print_section_v300(const char *pfx,
+	const struct acpi_hest_generic_data_v300 *gdata)
+{
+	__u8 hour, min, sec, day, mon, year, century, *timestamp;
+
+	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
+		timestamp = (__u8 *)&(gdata->time_stamp);
+		sec = bcd2bin(timestamp[0]);
+		min = bcd2bin(timestamp[1]);
+		hour = bcd2bin(timestamp[2]);
+		day = bcd2bin(timestamp[4]);
+		mon = bcd2bin(timestamp[5]);
+		year = bcd2bin(timestamp[6]);
+		century = bcd2bin(timestamp[7]);
+		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
+			0x01 & *(timestamp + 3) ? "precise" : "", century,
+			year, mon, day, hour, min, sec);
+	}
+}
+
 static void cper_estatus_print_section(
-	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
+	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)
 {
 	uuid_le *sec_type = (uuid_le *)gdata->section_type;
 	__u16 severity;
 	char newpfx[64];
 
+	if (acpi_hest_generic_data_version(gdata) >= 3)
+		cper_estatus_print_section_v300(pfx,
+			(const struct acpi_hest_generic_data_v300 *)gdata);
+
 	severity = gdata->error_severity;
 	printk("%s""Error %d, type: %s\n", pfx, sec_no,
 	       cper_severity_str(severity));
@@ -403,14 +430,18 @@ static void cper_estatus_print_section(
 
 	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
 	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
-		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
+		struct cper_sec_proc_generic *proc_err;
+
+		proc_err = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: general processor error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*proc_err))
 			cper_print_proc_generic(newpfx, proc_err);
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
-		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
+		struct cper_sec_mem_err *mem_err;
+
+		mem_err = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: memory error\n", newpfx);
 		if (gdata->error_data_length >=
 		    sizeof(struct cper_sec_mem_err_old))
@@ -419,7 +450,9 @@ static void cper_estatus_print_section(
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
-		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
+		struct cper_sec_pcie *pcie;
+
+		pcie = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: PCIe error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*pcie))
 			cper_print_pcie(newpfx, pcie, gdata);
@@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
 			const struct acpi_hest_generic_status *estatus)
 {
 	struct acpi_hest_generic_data *gdata;
-	unsigned int data_len, gedata_len;
+	unsigned int data_len;
 	int sec_no = 0;
 	char newpfx[64];
 	__u16 severity;
@@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
 	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
+
 	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
-	while (data_len >= sizeof(*gdata)) {
-		gedata_len = gdata->error_data_length;
+
+	while (data_len >= acpi_hest_generic_data_size(gdata)) {
 		cper_estatus_print_section(newpfx, gdata, sec_no);
-		data_len -= gedata_len + sizeof(*gdata);
-		gdata = (void *)(gdata + 1) + gedata_len;
+		data_len -= acpi_hest_generic_data_record_size(gdata);
+		gdata = acpi_hest_generic_data_next(gdata);
 		sec_no++;
 	}
 }
@@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
 		return rc;
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
-	while (data_len >= sizeof(*gdata)) {
-		gedata_len = gdata->error_data_length;
-		if (gedata_len > data_len - sizeof(*gdata))
+
+	while (data_len >= acpi_hest_generic_data_size(gdata)) {
+		gedata_len = acpi_hest_generic_data_error_length(gdata);
+		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
 			return -EINVAL;
-		data_len -= gedata_len + sizeof(*gdata);
-		gdata = (void *)(gdata + 1) + gedata_len;
+		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
+		gdata = acpi_hest_generic_data_next(gdata);
 	}
 	if (data_len)
 		return -EINVAL;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 68f088a..6ae318b 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -12,6 +12,18 @@
 #define GHES_TO_CLEAR		0x0001
 #define GHES_EXITING		0x0002
 
+#define acpi_hest_generic_data_error_length(gdata)	\
+	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
+#define acpi_hest_generic_data_size(gdata)		\
+	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
+	sizeof(struct acpi_hest_generic_data_v300) :	\
+	sizeof(struct acpi_hest_generic_data))
+#define acpi_hest_generic_data_record_size(gdata)	\
+	(acpi_hest_generic_data_size(gdata) +		\
+	acpi_hest_generic_data_error_length(gdata))
+#define acpi_hest_generic_data_next(gdata)		\
+	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
+
 struct ghes {
 	union {
 		struct acpi_hest_generic *generic;
@@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
 {
 }
 #endif
+
+#define acpi_hest_generic_data_version(gdata)			\
+	(gdata->revision >> 8)
+
+static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
+{
+	return acpi_hest_generic_data_version(gdata) >= 3 ?
+		(void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1) :
+		gdata + 1;
+}
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi
  Cc: Tyler Baicar

Currently when a RAS error is reported it is not timestamped.
The ACPI 6.1 spec adds the timestamp field to the generic error
data entry v3 structure. The timestamp of when the firmware
generated the error is now being reported.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 drivers/acpi/apei/ghes.c    |  9 ++++---
 drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
 include/acpi/ghes.h         | 22 ++++++++++++++++
 3 files changed, 77 insertions(+), 17 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 0241e36..9ddbb93 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
 	int flags = -1;
 	int sec_sev = ghes_severity(gdata->error_severity);
 	struct cper_sec_mem_err *mem_err;
-	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
+
+	mem_err = acpi_hest_generic_data_payload(gdata);
 
 	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
 		return;
@@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
 		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
 				 CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem_err;
-			mem_err = (struct cper_sec_mem_err *)(gdata+1);
+
+			mem_err = acpi_hest_generic_data_payload(gdata);
 			ghes_edac_report_mem_error(ghes, sev, mem_err);
 
 			arch_apei_report_mem_error(sev, mem_err);
@@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
 		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
 				      CPER_SEC_PCIE)) {
 			struct cper_sec_pcie *pcie_err;
-			pcie_err = (struct cper_sec_pcie *)(gdata+1);
+
+			pcie_err = acpi_hest_generic_data_payload(gdata);
 			if (sev == GHES_SEV_RECOVERABLE &&
 			    sec_sev == GHES_SEV_RECOVERABLE &&
 			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index d425374..8fa4e23 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -32,6 +32,9 @@
 #include <linux/acpi.h>
 #include <linux/pci.h>
 #include <linux/aer.h>
+#include <linux/printk.h>
+#include <linux/bcd.h>
+#include <acpi/ghes.h>
 
 #define INDENT_SP	" "
 
@@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
 	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
 }
 
+static void cper_estatus_print_section_v300(const char *pfx,
+	const struct acpi_hest_generic_data_v300 *gdata)
+{
+	__u8 hour, min, sec, day, mon, year, century, *timestamp;
+
+	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
+		timestamp = (__u8 *)&(gdata->time_stamp);
+		sec = bcd2bin(timestamp[0]);
+		min = bcd2bin(timestamp[1]);
+		hour = bcd2bin(timestamp[2]);
+		day = bcd2bin(timestamp[4]);
+		mon = bcd2bin(timestamp[5]);
+		year = bcd2bin(timestamp[6]);
+		century = bcd2bin(timestamp[7]);
+		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
+			0x01 & *(timestamp + 3) ? "precise" : "", century,
+			year, mon, day, hour, min, sec);
+	}
+}
+
 static void cper_estatus_print_section(
-	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
+	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)
 {
 	uuid_le *sec_type = (uuid_le *)gdata->section_type;
 	__u16 severity;
 	char newpfx[64];
 
+	if (acpi_hest_generic_data_version(gdata) >= 3)
+		cper_estatus_print_section_v300(pfx,
+			(const struct acpi_hest_generic_data_v300 *)gdata);
+
 	severity = gdata->error_severity;
 	printk("%s""Error %d, type: %s\n", pfx, sec_no,
 	       cper_severity_str(severity));
@@ -403,14 +430,18 @@ static void cper_estatus_print_section(
 
 	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
 	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
-		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
+		struct cper_sec_proc_generic *proc_err;
+
+		proc_err = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: general processor error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*proc_err))
 			cper_print_proc_generic(newpfx, proc_err);
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
-		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
+		struct cper_sec_mem_err *mem_err;
+
+		mem_err = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: memory error\n", newpfx);
 		if (gdata->error_data_length >=
 		    sizeof(struct cper_sec_mem_err_old))
@@ -419,7 +450,9 @@ static void cper_estatus_print_section(
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
-		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
+		struct cper_sec_pcie *pcie;
+
+		pcie = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: PCIe error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*pcie))
 			cper_print_pcie(newpfx, pcie, gdata);
@@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
 			const struct acpi_hest_generic_status *estatus)
 {
 	struct acpi_hest_generic_data *gdata;
-	unsigned int data_len, gedata_len;
+	unsigned int data_len;
 	int sec_no = 0;
 	char newpfx[64];
 	__u16 severity;
@@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
 	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
+
 	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
-	while (data_len >= sizeof(*gdata)) {
-		gedata_len = gdata->error_data_length;
+
+	while (data_len >= acpi_hest_generic_data_size(gdata)) {
 		cper_estatus_print_section(newpfx, gdata, sec_no);
-		data_len -= gedata_len + sizeof(*gdata);
-		gdata = (void *)(gdata + 1) + gedata_len;
+		data_len -= acpi_hest_generic_data_record_size(gdata);
+		gdata = acpi_hest_generic_data_next(gdata);
 		sec_no++;
 	}
 }
@@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
 		return rc;
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
-	while (data_len >= sizeof(*gdata)) {
-		gedata_len = gdata->error_data_length;
-		if (gedata_len > data_len - sizeof(*gdata))
+
+	while (data_len >= acpi_hest_generic_data_size(gdata)) {
+		gedata_len = acpi_hest_generic_data_error_length(gdata);
+		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
 			return -EINVAL;
-		data_len -= gedata_len + sizeof(*gdata);
-		gdata = (void *)(gdata + 1) + gedata_len;
+		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
+		gdata = acpi_hest_generic_data_next(gdata);
 	}
 	if (data_len)
 		return -EINVAL;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 68f088a..6ae318b 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -12,6 +12,18 @@
 #define GHES_TO_CLEAR		0x0001
 #define GHES_EXITING		0x0002
 
+#define acpi_hest_generic_data_error_length(gdata)	\
+	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
+#define acpi_hest_generic_data_size(gdata)		\
+	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
+	sizeof(struct acpi_hest_generic_data_v300) :	\
+	sizeof(struct acpi_hest_generic_data))
+#define acpi_hest_generic_data_record_size(gdata)	\
+	(acpi_hest_generic_data_size(gdata) +		\
+	acpi_hest_generic_data_error_length(gdata))
+#define acpi_hest_generic_data_next(gdata)		\
+	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
+
 struct ghes {
 	union {
 		struct acpi_hest_generic *generic;
@@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
 {
 }
 #endif
+
+#define acpi_hest_generic_data_version(gdata)			\
+	(gdata->revision >> 8)
+
+static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
+{
+	return acpi_hest_generic_data_version(gdata) >= 3 ?
+		(void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1) :
+		gdata + 1;
+}
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.


^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

Currently when a RAS error is reported it is not timestamped.
The ACPI 6.1 spec adds the timestamp field to the generic error
data entry v3 structure. The timestamp of when the firmware
generated the error is now being reported.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 drivers/acpi/apei/ghes.c    |  9 ++++---
 drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
 include/acpi/ghes.h         | 22 ++++++++++++++++
 3 files changed, 77 insertions(+), 17 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 0241e36..9ddbb93 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
 	int flags = -1;
 	int sec_sev = ghes_severity(gdata->error_severity);
 	struct cper_sec_mem_err *mem_err;
-	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
+
+	mem_err = acpi_hest_generic_data_payload(gdata);
 
 	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
 		return;
@@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
 		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
 				 CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem_err;
-			mem_err = (struct cper_sec_mem_err *)(gdata+1);
+
+			mem_err = acpi_hest_generic_data_payload(gdata);
 			ghes_edac_report_mem_error(ghes, sev, mem_err);
 
 			arch_apei_report_mem_error(sev, mem_err);
@@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
 		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
 				      CPER_SEC_PCIE)) {
 			struct cper_sec_pcie *pcie_err;
-			pcie_err = (struct cper_sec_pcie *)(gdata+1);
+
+			pcie_err = acpi_hest_generic_data_payload(gdata);
 			if (sev == GHES_SEV_RECOVERABLE &&
 			    sec_sev == GHES_SEV_RECOVERABLE &&
 			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index d425374..8fa4e23 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -32,6 +32,9 @@
 #include <linux/acpi.h>
 #include <linux/pci.h>
 #include <linux/aer.h>
+#include <linux/printk.h>
+#include <linux/bcd.h>
+#include <acpi/ghes.h>
 
 #define INDENT_SP	" "
 
@@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
 	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
 }
 
+static void cper_estatus_print_section_v300(const char *pfx,
+	const struct acpi_hest_generic_data_v300 *gdata)
+{
+	__u8 hour, min, sec, day, mon, year, century, *timestamp;
+
+	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
+		timestamp = (__u8 *)&(gdata->time_stamp);
+		sec = bcd2bin(timestamp[0]);
+		min = bcd2bin(timestamp[1]);
+		hour = bcd2bin(timestamp[2]);
+		day = bcd2bin(timestamp[4]);
+		mon = bcd2bin(timestamp[5]);
+		year = bcd2bin(timestamp[6]);
+		century = bcd2bin(timestamp[7]);
+		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
+			0x01 & *(timestamp + 3) ? "precise" : "", century,
+			year, mon, day, hour, min, sec);
+	}
+}
+
 static void cper_estatus_print_section(
-	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
+	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)
 {
 	uuid_le *sec_type = (uuid_le *)gdata->section_type;
 	__u16 severity;
 	char newpfx[64];
 
+	if (acpi_hest_generic_data_version(gdata) >= 3)
+		cper_estatus_print_section_v300(pfx,
+			(const struct acpi_hest_generic_data_v300 *)gdata);
+
 	severity = gdata->error_severity;
 	printk("%s""Error %d, type: %s\n", pfx, sec_no,
 	       cper_severity_str(severity));
@@ -403,14 +430,18 @@ static void cper_estatus_print_section(
 
 	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
 	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
-		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
+		struct cper_sec_proc_generic *proc_err;
+
+		proc_err = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: general processor error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*proc_err))
 			cper_print_proc_generic(newpfx, proc_err);
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
-		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
+		struct cper_sec_mem_err *mem_err;
+
+		mem_err = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: memory error\n", newpfx);
 		if (gdata->error_data_length >=
 		    sizeof(struct cper_sec_mem_err_old))
@@ -419,7 +450,9 @@ static void cper_estatus_print_section(
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
-		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
+		struct cper_sec_pcie *pcie;
+
+		pcie = acpi_hest_generic_data_payload(gdata);
 		printk("%s""section_type: PCIe error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*pcie))
 			cper_print_pcie(newpfx, pcie, gdata);
@@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
 			const struct acpi_hest_generic_status *estatus)
 {
 	struct acpi_hest_generic_data *gdata;
-	unsigned int data_len, gedata_len;
+	unsigned int data_len;
 	int sec_no = 0;
 	char newpfx[64];
 	__u16 severity;
@@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
 	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
+
 	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
-	while (data_len >= sizeof(*gdata)) {
-		gedata_len = gdata->error_data_length;
+
+	while (data_len >= acpi_hest_generic_data_size(gdata)) {
 		cper_estatus_print_section(newpfx, gdata, sec_no);
-		data_len -= gedata_len + sizeof(*gdata);
-		gdata = (void *)(gdata + 1) + gedata_len;
+		data_len -= acpi_hest_generic_data_record_size(gdata);
+		gdata = acpi_hest_generic_data_next(gdata);
 		sec_no++;
 	}
 }
@@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
 		return rc;
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
-	while (data_len >= sizeof(*gdata)) {
-		gedata_len = gdata->error_data_length;
-		if (gedata_len > data_len - sizeof(*gdata))
+
+	while (data_len >= acpi_hest_generic_data_size(gdata)) {
+		gedata_len = acpi_hest_generic_data_error_length(gdata);
+		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
 			return -EINVAL;
-		data_len -= gedata_len + sizeof(*gdata);
-		gdata = (void *)(gdata + 1) + gedata_len;
+		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
+		gdata = acpi_hest_generic_data_next(gdata);
 	}
 	if (data_len)
 		return -EINVAL;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 68f088a..6ae318b 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -12,6 +12,18 @@
 #define GHES_TO_CLEAR		0x0001
 #define GHES_EXITING		0x0002
 
+#define acpi_hest_generic_data_error_length(gdata)	\
+	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
+#define acpi_hest_generic_data_size(gdata)		\
+	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
+	sizeof(struct acpi_hest_generic_data_v300) :	\
+	sizeof(struct acpi_hest_generic_data))
+#define acpi_hest_generic_data_record_size(gdata)	\
+	(acpi_hest_generic_data_size(gdata) +		\
+	acpi_hest_generic_data_error_length(gdata))
+#define acpi_hest_generic_data_next(gdata)		\
+	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
+
 struct ghes {
 	union {
 		struct acpi_hest_generic *generic;
@@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
 {
 }
 #endif
+
+#define acpi_hest_generic_data_version(gdata)			\
+	(gdata->revision >> 8)
+
+static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
+{
+	return acpi_hest_generic_data_version(gdata) >= 3 ?
+		(void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1) :
+		gdata + 1;
+}
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 03/10] efi: parse ARM processor error
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

Add support for ARM Common Platform Error Record (CPER).
UEFI 2.6 specification adds support for ARM specific
processor error information to be reported as part of the
CPER records. This provides more detail on for processor error logs.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/cper.h        |  54 ++++++++++++++++++
 2 files changed, 187 insertions(+)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 8fa4e23..56aa516 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
 static const char * const proc_type_strs[] = {
 	"IA32/X64",
 	"IA64",
+	"ARM",
 };
 
 static const char * const proc_isa_strs[] = {
 	"IA32",
 	"IA64",
 	"X64",
+	"ARM A32/T32",
+	"ARM A64",
 };
 
 static const char * const proc_error_type_strs[] = {
@@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
 	"corrected",
 };
 
+static const char * const arm_reg_ctx_strs[] = {
+	"AArch32 general purpose registers",
+	"AArch32 EL1 context registers",
+	"AArch32 EL2 context registers",
+	"AArch32 secure context registers",
+	"AArch64 general purpose registers",
+	"AArch64 EL1 context registers",
+	"AArch64 EL2 context registers",
+	"AArch64 EL3 context registers",
+	"Misc. system register structure",
+};
+
 static void cper_print_proc_generic(const char *pfx,
 				    const struct cper_sec_proc_generic *proc)
 {
@@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
 		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
 }
 
+static void cper_print_proc_arm(const char *pfx,
+				const struct cper_sec_proc_arm *proc)
+{
+	int i, len, max_ctx_type;
+	struct cper_arm_err_info *err_info;
+	struct cper_arm_ctx_info *ctx_info;
+	char newpfx[64];
+
+	printk("%ssection length: %d\n", pfx, proc->section_length);
+	printk("%sMIDR: 0x%016llx\n", pfx, proc->midr);
+
+	len = proc->section_length - (sizeof(*proc) +
+		proc->err_info_num * (sizeof(*err_info)));
+	if (len < 0) {
+		printk("%ssection length is too small\n", pfx);
+		printk("%sfirmware-generated error record is incorrect\n", pfx);
+		printk("%sERR_INFO_NUM is %d\n", pfx, proc->err_info_num);
+		return;
+	}
+
+	if (proc->validation_bits & CPER_ARM_VALID_MPIDR)
+		printk("%sMPIDR: 0x%016llx\n", pfx, proc->mpidr);
+	if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL)
+		printk("%serror affinity level: %d\n", pfx,
+			proc->affinity_level);
+	if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) {
+		printk("%srunning state: 0x%x\n", pfx, proc->running_state);
+		printk("%sPSCI state: %d\n", pfx, proc->psci_state);
+	}
+
+	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
+
+	err_info = (struct cper_arm_err_info *)(proc + 1);
+	for (i = 0; i < proc->err_info_num; i++) {
+		printk("%sError info structure %d:\n", pfx, i);
+		printk("%sversion:%d\n", newpfx, err_info->version);
+		printk("%slength:%d\n", newpfx, err_info->length);
+		if (err_info->validation_bits &
+		    CPER_ARM_INFO_VALID_MULTI_ERR) {
+			if (err_info->multiple_error == 0)
+				printk("%ssingle error\n", newpfx);
+			else if (err_info->multiple_error == 1)
+				printk("%smultiple errors\n", newpfx);
+			else
+				printk("%smultiple errors count:%u\n",
+				newpfx, err_info->multiple_error);
+		}
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_FLAGS) {
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_FIRST)
+				printk("%sfirst error captured\n", newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_LAST)
+				printk("%slast error captured\n", newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_PROPAGATED)
+				printk("%spropagated error captured\n",
+				       newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_OVERFLOW)
+				printk("%soverflow occurred, error info is incomplete\n",
+				       newpfx);
+		}
+		printk("%serror_type: %d, %s\n", newpfx, err_info->type,
+			err_info->type < ARRAY_SIZE(proc_error_type_strs) ?
+			proc_error_type_strs[err_info->type] : "unknown");
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_ERR_INFO)
+			printk("%serror_info: 0x%016llx\n", newpfx,
+			       err_info->error_info);
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_VIRT_ADDR)
+			printk("%svirtual fault address: 0x%016llx\n",
+				newpfx, err_info->virt_fault_addr);
+		if (err_info->validation_bits &
+		    CPER_ARM_INFO_VALID_PHYSICAL_ADDR)
+			printk("%sphysical fault address: 0x%016llx\n",
+				newpfx, err_info->physical_fault_addr);
+		err_info += 1;
+	}
+	ctx_info = (struct cper_arm_ctx_info *)err_info;
+	max_ctx_type = ARRAY_SIZE(arm_reg_ctx_strs) - 1;
+	for (i = 0; i < proc->context_info_num; i++) {
+		int size = sizeof(*ctx_info) + ctx_info->size;
+
+		printk("%sContext info structure %d:\n", pfx, i);
+		if (len < size) {
+			printk("%ssection length is too small\n", newpfx);
+			printk("%sfirmware-generated error record is incorrect\n", pfx);
+			return;
+		}
+		if (ctx_info->type > max_ctx_type) {
+			printk("%sInvalid context type: %d\n", newpfx,
+							ctx_info->type);
+			printk("%sMax context type: %d\n", newpfx,
+							max_ctx_type);
+			return;
+		}
+		printk("%sregister context type %d: %s\n", newpfx,
+			ctx_info->type, arm_reg_ctx_strs[ctx_info->type]);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4,
+				(ctx_info + 1), ctx_info->size, 0);
+		len -= size;
+		ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + size);
+	}
+
+	if (len > 0) {
+		printk("%sVendor specific error info has %u bytes:\n", pfx,
+		       len);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, ctx_info,
+				len, true);
+	}
+}
+
 static const char * const mem_err_type_strs[] = {
 	"unknown",
 	"no error",
@@ -458,6 +581,16 @@ static void cper_estatus_print_section(
 			cper_print_pcie(newpfx, pcie, gdata);
 		else
 			goto err_section_too_small;
+	} else if ((IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_ARM)) &&
+		   !uuid_le_cmp(*sec_type, CPER_SEC_PROC_ARM)) {
+		struct cper_sec_proc_arm *arm_err;
+
+		arm_err = acpi_hest_generic_data_payload(gdata);
+		printk("%ssection_type: ARM processor error\n", newpfx);
+		if (gdata->error_data_length >= sizeof(*arm_err))
+			cper_print_proc_arm(newpfx, arm_err);
+		else
+			goto err_section_too_small;
 	} else
 		printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
 
diff --git a/include/linux/cper.h b/include/linux/cper.h
index dcacb1a..85450f3 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -180,6 +180,10 @@ enum {
 #define CPER_SEC_PROC_IPF						\
 	UUID_LE(0xE429FAF1, 0x3CB7, 0x11D4, 0x0B, 0xCA, 0x07, 0x00,	\
 		0x80, 0xC7, 0x3C, 0x88, 0x81)
+/* Processor Specific: ARM */
+#define CPER_SEC_PROC_ARM						\
+	UUID_LE(0xE19E3D16, 0xBC11, 0x11E4, 0x9C, 0xAA, 0xC2, 0x05,	\
+		0x1D, 0x5D, 0x46, 0xB0)
 /* Platform Memory */
 #define CPER_SEC_PLATFORM_MEM						\
 	UUID_LE(0xA5BC1114, 0x6F64, 0x4EDE, 0xB8, 0x63, 0x3E, 0x83,	\
@@ -255,6 +259,22 @@ enum {
 
 #define CPER_PCIE_SLOT_SHIFT			3
 
+#define CPER_ARM_VALID_MPIDR			0x00000001
+#define CPER_ARM_VALID_AFFINITY_LEVEL		0x00000002
+#define CPER_ARM_VALID_RUNNING_STATE		0x00000004
+#define CPER_ARM_VALID_VENDOR_INFO		0x00000008
+
+#define CPER_ARM_INFO_VALID_MULTI_ERR		0x0001
+#define CPER_ARM_INFO_VALID_FLAGS		0x0002
+#define CPER_ARM_INFO_VALID_ERR_INFO		0x0004
+#define CPER_ARM_INFO_VALID_VIRT_ADDR		0x0008
+#define CPER_ARM_INFO_VALID_PHYSICAL_ADDR	0x0010
+
+#define CPER_ARM_INFO_FLAGS_FIRST		0x0001
+#define CPER_ARM_INFO_FLAGS_LAST		0x0002
+#define CPER_ARM_INFO_FLAGS_PROPAGATED		0x0004
+#define CPER_ARM_INFO_FLAGS_OVERFLOW		0x0008
+
 /*
  * All tables and structs must be byte-packed to match CPER
  * specification, since the tables are provided by the system BIOS
@@ -340,6 +360,40 @@ struct cper_ia_proc_ctx {
 	__u64	mm_reg_addr;
 };
 
+/* ARM Processor Error Section */
+struct cper_sec_proc_arm {
+	__u32	validation_bits;
+	__u16	err_info_num; /* Number of Processor Error Info */
+	__u16	context_info_num; /* Number of Processor Context Info Records*/
+	__u32	section_length;
+	__u8	affinity_level;
+	__u8	reserved[3];	/* must be zero */
+	__u64	mpidr;
+	__u64	midr;
+	__u32	running_state; /* Bit 0 set - Processor running. PSCI = 0 */
+	__u32	psci_state;
+};
+
+/* ARM Processor Error Information Structure */
+struct cper_arm_err_info {
+	__u8	version;
+	__u8	length;
+	__u16	validation_bits;
+	__u8	type;
+	__u16	multiple_error;
+	__u8	flags;
+	__u64	error_info;
+	__u64	virt_fault_addr;
+	__u64	physical_fault_addr;
+};
+
+/* ARM Processor Context Information Structure */
+struct cper_arm_ctx_info {
+	__u16	version;
+	__u16	type;
+	__u32	size;
+};
+
 /* Old Memory Error Section UEFI 2.1, 2.2 */
 struct cper_sec_mem_err_old {
 	__u64	validation_bits;
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 03/10] efi: parse ARM processor error
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

Add support for ARM Common Platform Error Record (CPER).
UEFI 2.6 specification adds support for ARM specific
processor error information to be reported as part of the
CPER records. This provides more detail on for processor error logs.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/cper.h        |  54 ++++++++++++++++++
 2 files changed, 187 insertions(+)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 8fa4e23..56aa516 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
 static const char * const proc_type_strs[] = {
 	"IA32/X64",
 	"IA64",
+	"ARM",
 };
 
 static const char * const proc_isa_strs[] = {
 	"IA32",
 	"IA64",
 	"X64",
+	"ARM A32/T32",
+	"ARM A64",
 };
 
 static const char * const proc_error_type_strs[] = {
@@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
 	"corrected",
 };
 
+static const char * const arm_reg_ctx_strs[] = {
+	"AArch32 general purpose registers",
+	"AArch32 EL1 context registers",
+	"AArch32 EL2 context registers",
+	"AArch32 secure context registers",
+	"AArch64 general purpose registers",
+	"AArch64 EL1 context registers",
+	"AArch64 EL2 context registers",
+	"AArch64 EL3 context registers",
+	"Misc. system register structure",
+};
+
 static void cper_print_proc_generic(const char *pfx,
 				    const struct cper_sec_proc_generic *proc)
 {
@@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
 		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
 }
 
+static void cper_print_proc_arm(const char *pfx,
+				const struct cper_sec_proc_arm *proc)
+{
+	int i, len, max_ctx_type;
+	struct cper_arm_err_info *err_info;
+	struct cper_arm_ctx_info *ctx_info;
+	char newpfx[64];
+
+	printk("%ssection length: %d\n", pfx, proc->section_length);
+	printk("%sMIDR: 0x%016llx\n", pfx, proc->midr);
+
+	len = proc->section_length - (sizeof(*proc) +
+		proc->err_info_num * (sizeof(*err_info)));
+	if (len < 0) {
+		printk("%ssection length is too small\n", pfx);
+		printk("%sfirmware-generated error record is incorrect\n", pfx);
+		printk("%sERR_INFO_NUM is %d\n", pfx, proc->err_info_num);
+		return;
+	}
+
+	if (proc->validation_bits & CPER_ARM_VALID_MPIDR)
+		printk("%sMPIDR: 0x%016llx\n", pfx, proc->mpidr);
+	if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL)
+		printk("%serror affinity level: %d\n", pfx,
+			proc->affinity_level);
+	if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) {
+		printk("%srunning state: 0x%x\n", pfx, proc->running_state);
+		printk("%sPSCI state: %d\n", pfx, proc->psci_state);
+	}
+
+	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
+
+	err_info = (struct cper_arm_err_info *)(proc + 1);
+	for (i = 0; i < proc->err_info_num; i++) {
+		printk("%sError info structure %d:\n", pfx, i);
+		printk("%sversion:%d\n", newpfx, err_info->version);
+		printk("%slength:%d\n", newpfx, err_info->length);
+		if (err_info->validation_bits &
+		    CPER_ARM_INFO_VALID_MULTI_ERR) {
+			if (err_info->multiple_error == 0)
+				printk("%ssingle error\n", newpfx);
+			else if (err_info->multiple_error == 1)
+				printk("%smultiple errors\n", newpfx);
+			else
+				printk("%smultiple errors count:%u\n",
+				newpfx, err_info->multiple_error);
+		}
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_FLAGS) {
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_FIRST)
+				printk("%sfirst error captured\n", newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_LAST)
+				printk("%slast error captured\n", newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_PROPAGATED)
+				printk("%spropagated error captured\n",
+				       newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_OVERFLOW)
+				printk("%soverflow occurred, error info is incomplete\n",
+				       newpfx);
+		}
+		printk("%serror_type: %d, %s\n", newpfx, err_info->type,
+			err_info->type < ARRAY_SIZE(proc_error_type_strs) ?
+			proc_error_type_strs[err_info->type] : "unknown");
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_ERR_INFO)
+			printk("%serror_info: 0x%016llx\n", newpfx,
+			       err_info->error_info);
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_VIRT_ADDR)
+			printk("%svirtual fault address: 0x%016llx\n",
+				newpfx, err_info->virt_fault_addr);
+		if (err_info->validation_bits &
+		    CPER_ARM_INFO_VALID_PHYSICAL_ADDR)
+			printk("%sphysical fault address: 0x%016llx\n",
+				newpfx, err_info->physical_fault_addr);
+		err_info += 1;
+	}
+	ctx_info = (struct cper_arm_ctx_info *)err_info;
+	max_ctx_type = ARRAY_SIZE(arm_reg_ctx_strs) - 1;
+	for (i = 0; i < proc->context_info_num; i++) {
+		int size = sizeof(*ctx_info) + ctx_info->size;
+
+		printk("%sContext info structure %d:\n", pfx, i);
+		if (len < size) {
+			printk("%ssection length is too small\n", newpfx);
+			printk("%sfirmware-generated error record is incorrect\n", pfx);
+			return;
+		}
+		if (ctx_info->type > max_ctx_type) {
+			printk("%sInvalid context type: %d\n", newpfx,
+							ctx_info->type);
+			printk("%sMax context type: %d\n", newpfx,
+							max_ctx_type);
+			return;
+		}
+		printk("%sregister context type %d: %s\n", newpfx,
+			ctx_info->type, arm_reg_ctx_strs[ctx_info->type]);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4,
+				(ctx_info + 1), ctx_info->size, 0);
+		len -= size;
+		ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + size);
+	}
+
+	if (len > 0) {
+		printk("%sVendor specific error info has %u bytes:\n", pfx,
+		       len);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, ctx_info,
+				len, true);
+	}
+}
+
 static const char * const mem_err_type_strs[] = {
 	"unknown",
 	"no error",
@@ -458,6 +581,16 @@ static void cper_estatus_print_section(
 			cper_print_pcie(newpfx, pcie, gdata);
 		else
 			goto err_section_too_small;
+	} else if ((IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_ARM)) &&
+		   !uuid_le_cmp(*sec_type, CPER_SEC_PROC_ARM)) {
+		struct cper_sec_proc_arm *arm_err;
+
+		arm_err = acpi_hest_generic_data_payload(gdata);
+		printk("%ssection_type: ARM processor error\n", newpfx);
+		if (gdata->error_data_length >= sizeof(*arm_err))
+			cper_print_proc_arm(newpfx, arm_err);
+		else
+			goto err_section_too_small;
 	} else
 		printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
 
diff --git a/include/linux/cper.h b/include/linux/cper.h
index dcacb1a..85450f3 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -180,6 +180,10 @@ enum {
 #define CPER_SEC_PROC_IPF						\
 	UUID_LE(0xE429FAF1, 0x3CB7, 0x11D4, 0x0B, 0xCA, 0x07, 0x00,	\
 		0x80, 0xC7, 0x3C, 0x88, 0x81)
+/* Processor Specific: ARM */
+#define CPER_SEC_PROC_ARM						\
+	UUID_LE(0xE19E3D16, 0xBC11, 0x11E4, 0x9C, 0xAA, 0xC2, 0x05,	\
+		0x1D, 0x5D, 0x46, 0xB0)
 /* Platform Memory */
 #define CPER_SEC_PLATFORM_MEM						\
 	UUID_LE(0xA5BC1114, 0x6F64, 0x4EDE, 0xB8, 0x63, 0x3E, 0x83,	\
@@ -255,6 +259,22 @@ enum {
 
 #define CPER_PCIE_SLOT_SHIFT			3
 
+#define CPER_ARM_VALID_MPIDR			0x00000001
+#define CPER_ARM_VALID_AFFINITY_LEVEL		0x00000002
+#define CPER_ARM_VALID_RUNNING_STATE		0x00000004
+#define CPER_ARM_VALID_VENDOR_INFO		0x00000008
+
+#define CPER_ARM_INFO_VALID_MULTI_ERR		0x0001
+#define CPER_ARM_INFO_VALID_FLAGS		0x0002
+#define CPER_ARM_INFO_VALID_ERR_INFO		0x0004
+#define CPER_ARM_INFO_VALID_VIRT_ADDR		0x0008
+#define CPER_ARM_INFO_VALID_PHYSICAL_ADDR	0x0010
+
+#define CPER_ARM_INFO_FLAGS_FIRST		0x0001
+#define CPER_ARM_INFO_FLAGS_LAST		0x0002
+#define CPER_ARM_INFO_FLAGS_PROPAGATED		0x0004
+#define CPER_ARM_INFO_FLAGS_OVERFLOW		0x0008
+
 /*
  * All tables and structs must be byte-packed to match CPER
  * specification, since the tables are provided by the system BIOS
@@ -340,6 +360,40 @@ struct cper_ia_proc_ctx {
 	__u64	mm_reg_addr;
 };
 
+/* ARM Processor Error Section */
+struct cper_sec_proc_arm {
+	__u32	validation_bits;
+	__u16	err_info_num; /* Number of Processor Error Info */
+	__u16	context_info_num; /* Number of Processor Context Info Records*/
+	__u32	section_length;
+	__u8	affinity_level;
+	__u8	reserved[3];	/* must be zero */
+	__u64	mpidr;
+	__u64	midr;
+	__u32	running_state; /* Bit 0 set - Processor running. PSCI = 0 */
+	__u32	psci_state;
+};
+
+/* ARM Processor Error Information Structure */
+struct cper_arm_err_info {
+	__u8	version;
+	__u8	length;
+	__u16	validation_bits;
+	__u8	type;
+	__u16	multiple_error;
+	__u8	flags;
+	__u64	error_info;
+	__u64	virt_fault_addr;
+	__u64	physical_fault_addr;
+};
+
+/* ARM Processor Context Information Structure */
+struct cper_arm_ctx_info {
+	__u16	version;
+	__u16	type;
+	__u32	size;
+};
+
 /* Old Memory Error Section UEFI 2.1, 2.2 */
 struct cper_sec_mem_err_old {
 	__u64	validation_bits;
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 03/10] efi: parse ARM processor error
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

Add support for ARM Common Platform Error Record (CPER).
UEFI 2.6 specification adds support for ARM specific
processor error information to be reported as part of the
CPER records. This provides more detail on for processor error logs.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/cper.h        |  54 ++++++++++++++++++
 2 files changed, 187 insertions(+)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 8fa4e23..56aa516 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
 static const char * const proc_type_strs[] = {
 	"IA32/X64",
 	"IA64",
+	"ARM",
 };
 
 static const char * const proc_isa_strs[] = {
 	"IA32",
 	"IA64",
 	"X64",
+	"ARM A32/T32",
+	"ARM A64",
 };
 
 static const char * const proc_error_type_strs[] = {
@@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
 	"corrected",
 };
 
+static const char * const arm_reg_ctx_strs[] = {
+	"AArch32 general purpose registers",
+	"AArch32 EL1 context registers",
+	"AArch32 EL2 context registers",
+	"AArch32 secure context registers",
+	"AArch64 general purpose registers",
+	"AArch64 EL1 context registers",
+	"AArch64 EL2 context registers",
+	"AArch64 EL3 context registers",
+	"Misc. system register structure",
+};
+
 static void cper_print_proc_generic(const char *pfx,
 				    const struct cper_sec_proc_generic *proc)
 {
@@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
 		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
 }
 
+static void cper_print_proc_arm(const char *pfx,
+				const struct cper_sec_proc_arm *proc)
+{
+	int i, len, max_ctx_type;
+	struct cper_arm_err_info *err_info;
+	struct cper_arm_ctx_info *ctx_info;
+	char newpfx[64];
+
+	printk("%ssection length: %d\n", pfx, proc->section_length);
+	printk("%sMIDR: 0x%016llx\n", pfx, proc->midr);
+
+	len = proc->section_length - (sizeof(*proc) +
+		proc->err_info_num * (sizeof(*err_info)));
+	if (len < 0) {
+		printk("%ssection length is too small\n", pfx);
+		printk("%sfirmware-generated error record is incorrect\n", pfx);
+		printk("%sERR_INFO_NUM is %d\n", pfx, proc->err_info_num);
+		return;
+	}
+
+	if (proc->validation_bits & CPER_ARM_VALID_MPIDR)
+		printk("%sMPIDR: 0x%016llx\n", pfx, proc->mpidr);
+	if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL)
+		printk("%serror affinity level: %d\n", pfx,
+			proc->affinity_level);
+	if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) {
+		printk("%srunning state: 0x%x\n", pfx, proc->running_state);
+		printk("%sPSCI state: %d\n", pfx, proc->psci_state);
+	}
+
+	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
+
+	err_info = (struct cper_arm_err_info *)(proc + 1);
+	for (i = 0; i < proc->err_info_num; i++) {
+		printk("%sError info structure %d:\n", pfx, i);
+		printk("%sversion:%d\n", newpfx, err_info->version);
+		printk("%slength:%d\n", newpfx, err_info->length);
+		if (err_info->validation_bits &
+		    CPER_ARM_INFO_VALID_MULTI_ERR) {
+			if (err_info->multiple_error == 0)
+				printk("%ssingle error\n", newpfx);
+			else if (err_info->multiple_error == 1)
+				printk("%smultiple errors\n", newpfx);
+			else
+				printk("%smultiple errors count:%u\n",
+				newpfx, err_info->multiple_error);
+		}
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_FLAGS) {
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_FIRST)
+				printk("%sfirst error captured\n", newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_LAST)
+				printk("%slast error captured\n", newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_PROPAGATED)
+				printk("%spropagated error captured\n",
+				       newpfx);
+			if (err_info->flags & CPER_ARM_INFO_FLAGS_OVERFLOW)
+				printk("%soverflow occurred, error info is incomplete\n",
+				       newpfx);
+		}
+		printk("%serror_type: %d, %s\n", newpfx, err_info->type,
+			err_info->type < ARRAY_SIZE(proc_error_type_strs) ?
+			proc_error_type_strs[err_info->type] : "unknown");
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_ERR_INFO)
+			printk("%serror_info: 0x%016llx\n", newpfx,
+			       err_info->error_info);
+		if (err_info->validation_bits & CPER_ARM_INFO_VALID_VIRT_ADDR)
+			printk("%svirtual fault address: 0x%016llx\n",
+				newpfx, err_info->virt_fault_addr);
+		if (err_info->validation_bits &
+		    CPER_ARM_INFO_VALID_PHYSICAL_ADDR)
+			printk("%sphysical fault address: 0x%016llx\n",
+				newpfx, err_info->physical_fault_addr);
+		err_info += 1;
+	}
+	ctx_info = (struct cper_arm_ctx_info *)err_info;
+	max_ctx_type = ARRAY_SIZE(arm_reg_ctx_strs) - 1;
+	for (i = 0; i < proc->context_info_num; i++) {
+		int size = sizeof(*ctx_info) + ctx_info->size;
+
+		printk("%sContext info structure %d:\n", pfx, i);
+		if (len < size) {
+			printk("%ssection length is too small\n", newpfx);
+			printk("%sfirmware-generated error record is incorrect\n", pfx);
+			return;
+		}
+		if (ctx_info->type > max_ctx_type) {
+			printk("%sInvalid context type: %d\n", newpfx,
+							ctx_info->type);
+			printk("%sMax context type: %d\n", newpfx,
+							max_ctx_type);
+			return;
+		}
+		printk("%sregister context type %d: %s\n", newpfx,
+			ctx_info->type, arm_reg_ctx_strs[ctx_info->type]);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4,
+				(ctx_info + 1), ctx_info->size, 0);
+		len -= size;
+		ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + size);
+	}
+
+	if (len > 0) {
+		printk("%sVendor specific error info has %u bytes:\n", pfx,
+		       len);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, ctx_info,
+				len, true);
+	}
+}
+
 static const char * const mem_err_type_strs[] = {
 	"unknown",
 	"no error",
@@ -458,6 +581,16 @@ static void cper_estatus_print_section(
 			cper_print_pcie(newpfx, pcie, gdata);
 		else
 			goto err_section_too_small;
+	} else if ((IS_ENABLED(CONFIG_ARM64) || IS_ENABLED(CONFIG_ARM)) &&
+		   !uuid_le_cmp(*sec_type, CPER_SEC_PROC_ARM)) {
+		struct cper_sec_proc_arm *arm_err;
+
+		arm_err = acpi_hest_generic_data_payload(gdata);
+		printk("%ssection_type: ARM processor error\n", newpfx);
+		if (gdata->error_data_length >= sizeof(*arm_err))
+			cper_print_proc_arm(newpfx, arm_err);
+		else
+			goto err_section_too_small;
 	} else
 		printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
 
diff --git a/include/linux/cper.h b/include/linux/cper.h
index dcacb1a..85450f3 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -180,6 +180,10 @@ enum {
 #define CPER_SEC_PROC_IPF						\
 	UUID_LE(0xE429FAF1, 0x3CB7, 0x11D4, 0x0B, 0xCA, 0x07, 0x00,	\
 		0x80, 0xC7, 0x3C, 0x88, 0x81)
+/* Processor Specific: ARM */
+#define CPER_SEC_PROC_ARM						\
+	UUID_LE(0xE19E3D16, 0xBC11, 0x11E4, 0x9C, 0xAA, 0xC2, 0x05,	\
+		0x1D, 0x5D, 0x46, 0xB0)
 /* Platform Memory */
 #define CPER_SEC_PLATFORM_MEM						\
 	UUID_LE(0xA5BC1114, 0x6F64, 0x4EDE, 0xB8, 0x63, 0x3E, 0x83,	\
@@ -255,6 +259,22 @@ enum {
 
 #define CPER_PCIE_SLOT_SHIFT			3
 
+#define CPER_ARM_VALID_MPIDR			0x00000001
+#define CPER_ARM_VALID_AFFINITY_LEVEL		0x00000002
+#define CPER_ARM_VALID_RUNNING_STATE		0x00000004
+#define CPER_ARM_VALID_VENDOR_INFO		0x00000008
+
+#define CPER_ARM_INFO_VALID_MULTI_ERR		0x0001
+#define CPER_ARM_INFO_VALID_FLAGS		0x0002
+#define CPER_ARM_INFO_VALID_ERR_INFO		0x0004
+#define CPER_ARM_INFO_VALID_VIRT_ADDR		0x0008
+#define CPER_ARM_INFO_VALID_PHYSICAL_ADDR	0x0010
+
+#define CPER_ARM_INFO_FLAGS_FIRST		0x0001
+#define CPER_ARM_INFO_FLAGS_LAST		0x0002
+#define CPER_ARM_INFO_FLAGS_PROPAGATED		0x0004
+#define CPER_ARM_INFO_FLAGS_OVERFLOW		0x0008
+
 /*
  * All tables and structs must be byte-packed to match CPER
  * specification, since the tables are provided by the system BIOS
@@ -340,6 +360,40 @@ struct cper_ia_proc_ctx {
 	__u64	mm_reg_addr;
 };
 
+/* ARM Processor Error Section */
+struct cper_sec_proc_arm {
+	__u32	validation_bits;
+	__u16	err_info_num; /* Number of Processor Error Info */
+	__u16	context_info_num; /* Number of Processor Context Info Records*/
+	__u32	section_length;
+	__u8	affinity_level;
+	__u8	reserved[3];	/* must be zero */
+	__u64	mpidr;
+	__u64	midr;
+	__u32	running_state; /* Bit 0 set - Processor running. PSCI = 0 */
+	__u32	psci_state;
+};
+
+/* ARM Processor Error Information Structure */
+struct cper_arm_err_info {
+	__u8	version;
+	__u8	length;
+	__u16	validation_bits;
+	__u8	type;
+	__u16	multiple_error;
+	__u8	flags;
+	__u64	error_info;
+	__u64	virt_fault_addr;
+	__u64	physical_fault_addr;
+};
+
+/* ARM Processor Context Information Structure */
+struct cper_arm_ctx_info {
+	__u16	version;
+	__u16	type;
+	__u32	size;
+};
+
 /* Old Memory Error Section UEFI 2.1, 2.2 */
 struct cper_sec_mem_err_old {
 	__u64	validation_bits;
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 04/10] arm64: exception: handle Synchronous External Abort
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

SEA exceptions are often caused by an uncorrected hardware
error, and are handled when data abort and instruction abort
exception classes have specific values for their Fault Status
Code.
When SEA occurs, before killing the process, report the error
in the kernel logs.
Update fault_info[] with specific SEA faults so that the
new SEA handler is used.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/esr.h |  1 +
 arch/arm64/mm/fault.c        | 43 +++++++++++++++++++++++++++++++++----------
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index d14c478..f20c64a 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -83,6 +83,7 @@
 #define ESR_ELx_WNR		(UL(1) << 6)
 
 /* Shared ISS field definitions for Data/Instruction aborts */
+#define ESR_ELx_FnV		(UL(1) << 10)
 #define ESR_ELx_EA		(UL(1) << 9)
 #define ESR_ELx_S1PTW		(UL(1) << 7)
 
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 4bf899f..e17633d 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -488,6 +488,29 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	return 1;
 }
 
+/*
+ * This abort handler deals with Synchronous External Abort.
+ * It calls notifiers, and then returns "fault".
+ */
+static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
+{
+	struct siginfo info;
+
+	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
+		 fault_name(esr), esr, addr);
+
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code  = 0;
+	if (esr & ESR_ELx_FnV)
+		info.si_addr = 0;
+	else
+		info.si_addr  = (void __user *)addr;
+	arm64_notify_die("", regs, &info, esr);
+
+	return 0;
+}
+
 static const struct fault_info {
 	int	(*fn)(unsigned long addr, unsigned int esr, struct pt_regs *regs);
 	int	sig;
@@ -510,22 +533,22 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 1 permission fault"	},
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 2 permission fault"	},
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 permission fault"	},
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort"	},
+	{ do_sea,		SIGBUS,  0,		"synchronous external abort"	},
 	{ do_bad,		SIGBUS,  0,		"unknown 17"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 18"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 19"			},
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error"	},
+	{ do_sea,		SIGBUS,  0,		"level 0 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 1 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 2 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 3 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"synchronous parity or ECC error" },
 	{ do_bad,		SIGBUS,  0,		"unknown 25"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 26"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 27"			},
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
+	{ do_sea,		SIGBUS,  0,		"level 0 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 1 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 2 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 3 synchronous parity error (translation table walk)"	},
 	{ do_bad,		SIGBUS,  0,		"unknown 32"			},
 	{ do_alignment_fault,	SIGBUS,  BUS_ADRALN,	"alignment fault"		},
 	{ do_bad,		SIGBUS,  0,		"unknown 34"			},
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 04/10] arm64: exception: handle Synchronous External Abort
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

SEA exceptions are often caused by an uncorrected hardware
error, and are handled when data abort and instruction abort
exception classes have specific values for their Fault Status
Code.
When SEA occurs, before killing the process, report the error
in the kernel logs.
Update fault_info[] with specific SEA faults so that the
new SEA handler is used.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/esr.h |  1 +
 arch/arm64/mm/fault.c        | 43 +++++++++++++++++++++++++++++++++----------
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index d14c478..f20c64a 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -83,6 +83,7 @@
 #define ESR_ELx_WNR		(UL(1) << 6)
 
 /* Shared ISS field definitions for Data/Instruction aborts */
+#define ESR_ELx_FnV		(UL(1) << 10)
 #define ESR_ELx_EA		(UL(1) << 9)
 #define ESR_ELx_S1PTW		(UL(1) << 7)
 
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 4bf899f..e17633d 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -488,6 +488,29 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	return 1;
 }
 
+/*
+ * This abort handler deals with Synchronous External Abort.
+ * It calls notifiers, and then returns "fault".
+ */
+static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
+{
+	struct siginfo info;
+
+	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
+		 fault_name(esr), esr, addr);
+
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code  = 0;
+	if (esr & ESR_ELx_FnV)
+		info.si_addr = 0;
+	else
+		info.si_addr  = (void __user *)addr;
+	arm64_notify_die("", regs, &info, esr);
+
+	return 0;
+}
+
 static const struct fault_info {
 	int	(*fn)(unsigned long addr, unsigned int esr, struct pt_regs *regs);
 	int	sig;
@@ -510,22 +533,22 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 1 permission fault"	},
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 2 permission fault"	},
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 permission fault"	},
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort"	},
+	{ do_sea,		SIGBUS,  0,		"synchronous external abort"	},
 	{ do_bad,		SIGBUS,  0,		"unknown 17"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 18"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 19"			},
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error"	},
+	{ do_sea,		SIGBUS,  0,		"level 0 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 1 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 2 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 3 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"synchronous parity or ECC error" },
 	{ do_bad,		SIGBUS,  0,		"unknown 25"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 26"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 27"			},
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
+	{ do_sea,		SIGBUS,  0,		"level 0 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 1 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 2 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 3 synchronous parity error (translation table walk)"	},
 	{ do_bad,		SIGBUS,  0,		"unknown 32"			},
 	{ do_alignment_fault,	SIGBUS,  BUS_ADRALN,	"alignment fault"		},
 	{ do_bad,		SIGBUS,  0,		"unknown 34"			},
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 04/10] arm64: exception: handle Synchronous External Abort
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

SEA exceptions are often caused by an uncorrected hardware
error, and are handled when data abort and instruction abort
exception classes have specific values for their Fault Status
Code.
When SEA occurs, before killing the process, report the error
in the kernel logs.
Update fault_info[] with specific SEA faults so that the
new SEA handler is used.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/esr.h |  1 +
 arch/arm64/mm/fault.c        | 43 +++++++++++++++++++++++++++++++++----------
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index d14c478..f20c64a 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -83,6 +83,7 @@
 #define ESR_ELx_WNR		(UL(1) << 6)
 
 /* Shared ISS field definitions for Data/Instruction aborts */
+#define ESR_ELx_FnV		(UL(1) << 10)
 #define ESR_ELx_EA		(UL(1) << 9)
 #define ESR_ELx_S1PTW		(UL(1) << 7)
 
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 4bf899f..e17633d 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -488,6 +488,29 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	return 1;
 }
 
+/*
+ * This abort handler deals with Synchronous External Abort.
+ * It calls notifiers, and then returns "fault".
+ */
+static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
+{
+	struct siginfo info;
+
+	pr_err("Synchronous External Abort: %s (0x%08x)@0x%016lx\n",
+		 fault_name(esr), esr, addr);
+
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code  = 0;
+	if (esr & ESR_ELx_FnV)
+		info.si_addr = 0;
+	else
+		info.si_addr  = (void __user *)addr;
+	arm64_notify_die("", regs, &info, esr);
+
+	return 0;
+}
+
 static const struct fault_info {
 	int	(*fn)(unsigned long addr, unsigned int esr, struct pt_regs *regs);
 	int	sig;
@@ -510,22 +533,22 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 1 permission fault"	},
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 2 permission fault"	},
 	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 permission fault"	},
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort"	},
+	{ do_sea,		SIGBUS,  0,		"synchronous external abort"	},
 	{ do_bad,		SIGBUS,  0,		"unknown 17"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 18"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 19"			},
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error"	},
+	{ do_sea,		SIGBUS,  0,		"level 0 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 1 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 2 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 3 (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"synchronous parity or ECC error" },
 	{ do_bad,		SIGBUS,  0,		"unknown 25"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 26"			},
 	{ do_bad,		SIGBUS,  0,		"unknown 27"			},
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
-	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },
+	{ do_sea,		SIGBUS,  0,		"level 0 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 1 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 2 synchronous parity error (translation table walk)"	},
+	{ do_sea,		SIGBUS,  0,		"level 3 synchronous parity error (translation table walk)"	},
 	{ do_bad,		SIGBUS,  0,		"unknown 32"			},
 	{ do_alignment_fault,	SIGBUS,  BUS_ADRALN,	"alignment fault"		},
 	{ do_bad,		SIGBUS,  0,		"unknown 34"			},
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 05/10] acpi: apei: handle SEA notification type for ARMv8
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

ARM APEI extension proposal added SEA (Synchronous External Abort)
notification type for ARMv8.
Add a new GHES error source handling function for SEA. If an error
source's notification type is SEA, then this function can be registered
into the SEA exception handler. That way GHES will parse and report
SEA exceptions when they occur.
An SEA can interrupt code that had interrupts masked and is treated as
an NMI. To aid this the page of address space for mapping APEI buffers
while in_nmi() is always reserved, and ghes_ioremap_pfn_nmi() is
changed to use the helper methods to find the prot_t to map with in
the same way as ghes_ioremap_pfn_irq().

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/Kconfig        |  2 ++
 arch/arm64/mm/fault.c     | 13 +++++++++
 drivers/acpi/apei/Kconfig | 15 ++++++++++
 drivers/acpi/apei/ghes.c  | 70 +++++++++++++++++++++++++++++++++++++++++++----
 include/acpi/ghes.h       |  7 +++++
 5 files changed, 101 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 8c7c244..d542d17 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -18,6 +18,7 @@ config ARM64
 	select ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_HAS_STRICT_MODULE_RWX
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+	select ARCH_HAVE_NMI_SAFE_CMPXCHG if ACPI_APEI_SEA
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select ARCH_SUPPORTS_NUMA_BALANCING
@@ -92,6 +93,7 @@ config ARM64
 	select HAVE_IRQ_TIME_ACCOUNTING
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP if NUMA
+	select HAVE_NMI if ACPI_APEI_SEA
 	select HAVE_PATA_PLATFORM
 	select HAVE_PERF_EVENTS
 	select HAVE_PERF_REGS
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index e17633d..f7372ce 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -42,6 +42,8 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 
+#include <acpi/ghes.h>
+
 static const char *fault_name(unsigned int esr);
 
 #ifdef CONFIG_KPROBES
@@ -499,6 +501,17 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
 		 fault_name(esr), esr, addr);
 
+	/*
+	 * Synchronous aborts may interrupt code which had interrupts masked.
+	 * Before calling out into the wider kernel tell the interested
+	 * subsystems.
+	 */
+	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+		nmi_enter();
+		ghes_notify_sea();
+		nmi_exit();
+	}
+
 	info.si_signo = SIGBUS;
 	info.si_errno = 0;
 	info.si_code  = 0;
diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
index b0140c8..de14d49 100644
--- a/drivers/acpi/apei/Kconfig
+++ b/drivers/acpi/apei/Kconfig
@@ -39,6 +39,21 @@ config ACPI_APEI_PCIEAER
 	  PCIe AER errors may be reported via APEI firmware first mode.
 	  Turn on this option to enable the corresponding support.
 
+config ACPI_APEI_SEA
+	bool "APEI Synchronous External Abort logging/recovering support"
+	depends on ARM64 && ACPI_APEI_GHES
+	default y
+	help
+	  This option should be enabled if the system supports
+	  firmware first handling of SEA (Synchronous External Abort).
+	  SEA happens with certain faults of data abort or instruction
+	  abort synchronous exceptions on ARMv8 systems. If a system
+	  supports firmware first handling of SEA, the platform analyzes
+	  and handles hardware error notifications from SEA, and it may then
+	  form a HW error record for the OS to parse and handle. This
+	  option allows the OS to look for such hardware error record, and
+	  take appropriate action.
+
 config ACPI_APEI_MEMORY_FAILURE
 	bool "APEI memory error recovering support"
 	depends on ACPI_APEI && MEMORY_FAILURE
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 9ddbb93..b735a5c 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -115,11 +115,7 @@
  * Two virtual pages are used, one for IRQ/PROCESS context, the other for
  * NMI context (optionally).
  */
-#ifdef CONFIG_HAVE_ACPI_APEI_NMI
 #define GHES_IOREMAP_PAGES           2
-#else
-#define GHES_IOREMAP_PAGES           1
-#endif
 #define GHES_IOREMAP_IRQ_PAGE(base)	(base)
 #define GHES_IOREMAP_NMI_PAGE(base)	((base) + PAGE_SIZE)
 
@@ -158,10 +154,14 @@ static void ghes_ioremap_exit(void)
 static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
 {
 	unsigned long vaddr;
+	phys_addr_t paddr;
+	pgprot_t prot;
 
 	vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
-	ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
-			   pfn << PAGE_SHIFT, PAGE_KERNEL);
+
+	paddr = pfn << PAGE_SHIFT;
+	prot = arch_apei_get_mem_attribute(paddr);
+	ioremap_page_range(vaddr, vaddr + PAGE_SIZE, paddr, prot);
 
 	return (void __iomem *)vaddr;
 }
@@ -768,6 +768,50 @@ static int ghes_notify_sci(struct notifier_block *this,
 	.notifier_call = ghes_notify_sci,
 };
 
+#ifdef CONFIG_ACPI_APEI_SEA
+static LIST_HEAD(ghes_sea);
+
+void ghes_notify_sea(void)
+{
+	struct ghes *ghes;
+
+	/*
+	 * synchronize_rcu() will wait for nmi_exit(), so no need to
+	 * rcu_read_lock().
+	 */
+	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
+		ghes_proc(ghes);
+	}
+}
+
+static void ghes_sea_add(struct ghes *ghes)
+{
+	mutex_lock(&ghes_list_mutex);
+	list_add_rcu(&ghes->list, &ghes_sea);
+	mutex_unlock(&ghes_list_mutex);
+}
+
+static void ghes_sea_remove(struct ghes *ghes)
+{
+	mutex_lock(&ghes_list_mutex);
+	list_del_rcu(&ghes->list);
+	mutex_unlock(&ghes_list_mutex);
+	synchronize_rcu();
+}
+#else /* CONFIG_ACPI_APEI_SEA */
+static inline void ghes_sea_add(struct ghes *ghes)
+{
+	pr_err(GHES_PFX "ID: %d, trying to add SEA notification which is not supported\n",
+	       ghes->generic->header.source_id);
+}
+
+static inline void ghes_sea_remove(struct ghes *ghes)
+{
+	pr_err(GHES_PFX "ID: %d, trying to remove SEA notification which is not supported\n",
+	       ghes->generic->header.source_id);
+}
+#endif /* CONFIG_ACPI_APEI_SEA */
+
 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
 /*
  * printk is not safe in NMI context.  So in NMI handler, we allocate
@@ -1013,6 +1057,14 @@ static int ghes_probe(struct platform_device *ghes_dev)
 	case ACPI_HEST_NOTIFY_EXTERNAL:
 	case ACPI_HEST_NOTIFY_SCI:
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+			pr_warn(GHES_PFX "Generic hardware error source: %d notified via SEA is not supported\n",
+				generic->header.source_id);
+			rc = -ENOTSUPP;
+			goto err;
+		}
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
 			pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
@@ -1078,6 +1130,9 @@ static int ghes_probe(struct platform_device *ghes_dev)
 		list_add_rcu(&ghes->list, &ghes_sci);
 		mutex_unlock(&ghes_list_mutex);
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		ghes_sea_add(ghes);
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		ghes_nmi_add(ghes);
 		break;
@@ -1120,6 +1175,9 @@ static int ghes_remove(struct platform_device *ghes_dev)
 			unregister_acpi_hed_notifier(&ghes_notifier_sci);
 		mutex_unlock(&ghes_list_mutex);
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		ghes_sea_remove(ghes);
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		ghes_nmi_remove(ghes);
 		break;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 6ae318b..18bc935 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -1,3 +1,6 @@
+#ifndef GHES_H
+#define GHES_H
+
 #include <acpi/apei.h>
 #include <acpi/hed.h>
 
@@ -95,3 +98,7 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
 		(void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1) :
 		gdata + 1;
 }
+
+void ghes_notify_sea(void);
+
+#endif /* GHES_H */
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 05/10] acpi: apei: handle SEA notification type for ARMv8
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

ARM APEI extension proposal added SEA (Synchronous External Abort)
notification type for ARMv8.
Add a new GHES error source handling function for SEA. If an error
source's notification type is SEA, then this function can be registered
into the SEA exception handler. That way GHES will parse and report
SEA exceptions when they occur.
An SEA can interrupt code that had interrupts masked and is treated as
an NMI. To aid this the page of address space for mapping APEI buffers
while in_nmi() is always reserved, and ghes_ioremap_pfn_nmi() is
changed to use the helper methods to find the prot_t to map with in
the same way as ghes_ioremap_pfn_irq().

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/Kconfig        |  2 ++
 arch/arm64/mm/fault.c     | 13 +++++++++
 drivers/acpi/apei/Kconfig | 15 ++++++++++
 drivers/acpi/apei/ghes.c  | 70 +++++++++++++++++++++++++++++++++++++++++++----
 include/acpi/ghes.h       |  7 +++++
 5 files changed, 101 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 8c7c244..d542d17 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -18,6 +18,7 @@ config ARM64
 	select ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_HAS_STRICT_MODULE_RWX
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+	select ARCH_HAVE_NMI_SAFE_CMPXCHG if ACPI_APEI_SEA
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select ARCH_SUPPORTS_NUMA_BALANCING
@@ -92,6 +93,7 @@ config ARM64
 	select HAVE_IRQ_TIME_ACCOUNTING
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP if NUMA
+	select HAVE_NMI if ACPI_APEI_SEA
 	select HAVE_PATA_PLATFORM
 	select HAVE_PERF_EVENTS
 	select HAVE_PERF_REGS
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index e17633d..f7372ce 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -42,6 +42,8 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 
+#include <acpi/ghes.h>
+
 static const char *fault_name(unsigned int esr);
 
 #ifdef CONFIG_KPROBES
@@ -499,6 +501,17 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
 		 fault_name(esr), esr, addr);
 
+	/*
+	 * Synchronous aborts may interrupt code which had interrupts masked.
+	 * Before calling out into the wider kernel tell the interested
+	 * subsystems.
+	 */
+	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+		nmi_enter();
+		ghes_notify_sea();
+		nmi_exit();
+	}
+
 	info.si_signo = SIGBUS;
 	info.si_errno = 0;
 	info.si_code  = 0;
diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
index b0140c8..de14d49 100644
--- a/drivers/acpi/apei/Kconfig
+++ b/drivers/acpi/apei/Kconfig
@@ -39,6 +39,21 @@ config ACPI_APEI_PCIEAER
 	  PCIe AER errors may be reported via APEI firmware first mode.
 	  Turn on this option to enable the corresponding support.
 
+config ACPI_APEI_SEA
+	bool "APEI Synchronous External Abort logging/recovering support"
+	depends on ARM64 && ACPI_APEI_GHES
+	default y
+	help
+	  This option should be enabled if the system supports
+	  firmware first handling of SEA (Synchronous External Abort).
+	  SEA happens with certain faults of data abort or instruction
+	  abort synchronous exceptions on ARMv8 systems. If a system
+	  supports firmware first handling of SEA, the platform analyzes
+	  and handles hardware error notifications from SEA, and it may then
+	  form a HW error record for the OS to parse and handle. This
+	  option allows the OS to look for such hardware error record, and
+	  take appropriate action.
+
 config ACPI_APEI_MEMORY_FAILURE
 	bool "APEI memory error recovering support"
 	depends on ACPI_APEI && MEMORY_FAILURE
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 9ddbb93..b735a5c 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -115,11 +115,7 @@
  * Two virtual pages are used, one for IRQ/PROCESS context, the other for
  * NMI context (optionally).
  */
-#ifdef CONFIG_HAVE_ACPI_APEI_NMI
 #define GHES_IOREMAP_PAGES           2
-#else
-#define GHES_IOREMAP_PAGES           1
-#endif
 #define GHES_IOREMAP_IRQ_PAGE(base)	(base)
 #define GHES_IOREMAP_NMI_PAGE(base)	((base) + PAGE_SIZE)
 
@@ -158,10 +154,14 @@ static void ghes_ioremap_exit(void)
 static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
 {
 	unsigned long vaddr;
+	phys_addr_t paddr;
+	pgprot_t prot;
 
 	vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
-	ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
-			   pfn << PAGE_SHIFT, PAGE_KERNEL);
+
+	paddr = pfn << PAGE_SHIFT;
+	prot = arch_apei_get_mem_attribute(paddr);
+	ioremap_page_range(vaddr, vaddr + PAGE_SIZE, paddr, prot);
 
 	return (void __iomem *)vaddr;
 }
@@ -768,6 +768,50 @@ static int ghes_notify_sci(struct notifier_block *this,
 	.notifier_call = ghes_notify_sci,
 };
 
+#ifdef CONFIG_ACPI_APEI_SEA
+static LIST_HEAD(ghes_sea);
+
+void ghes_notify_sea(void)
+{
+	struct ghes *ghes;
+
+	/*
+	 * synchronize_rcu() will wait for nmi_exit(), so no need to
+	 * rcu_read_lock().
+	 */
+	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
+		ghes_proc(ghes);
+	}
+}
+
+static void ghes_sea_add(struct ghes *ghes)
+{
+	mutex_lock(&ghes_list_mutex);
+	list_add_rcu(&ghes->list, &ghes_sea);
+	mutex_unlock(&ghes_list_mutex);
+}
+
+static void ghes_sea_remove(struct ghes *ghes)
+{
+	mutex_lock(&ghes_list_mutex);
+	list_del_rcu(&ghes->list);
+	mutex_unlock(&ghes_list_mutex);
+	synchronize_rcu();
+}
+#else /* CONFIG_ACPI_APEI_SEA */
+static inline void ghes_sea_add(struct ghes *ghes)
+{
+	pr_err(GHES_PFX "ID: %d, trying to add SEA notification which is not supported\n",
+	       ghes->generic->header.source_id);
+}
+
+static inline void ghes_sea_remove(struct ghes *ghes)
+{
+	pr_err(GHES_PFX "ID: %d, trying to remove SEA notification which is not supported\n",
+	       ghes->generic->header.source_id);
+}
+#endif /* CONFIG_ACPI_APEI_SEA */
+
 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
 /*
  * printk is not safe in NMI context.  So in NMI handler, we allocate
@@ -1013,6 +1057,14 @@ static int ghes_probe(struct platform_device *ghes_dev)
 	case ACPI_HEST_NOTIFY_EXTERNAL:
 	case ACPI_HEST_NOTIFY_SCI:
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+			pr_warn(GHES_PFX "Generic hardware error source: %d notified via SEA is not supported\n",
+				generic->header.source_id);
+			rc = -ENOTSUPP;
+			goto err;
+		}
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
 			pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
@@ -1078,6 +1130,9 @@ static int ghes_probe(struct platform_device *ghes_dev)
 		list_add_rcu(&ghes->list, &ghes_sci);
 		mutex_unlock(&ghes_list_mutex);
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		ghes_sea_add(ghes);
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		ghes_nmi_add(ghes);
 		break;
@@ -1120,6 +1175,9 @@ static int ghes_remove(struct platform_device *ghes_dev)
 			unregister_acpi_hed_notifier(&ghes_notifier_sci);
 		mutex_unlock(&ghes_list_mutex);
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		ghes_sea_remove(ghes);
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		ghes_nmi_remove(ghes);
 		break;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 6ae318b..18bc935 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -1,3 +1,6 @@
+#ifndef GHES_H
+#define GHES_H
+
 #include <acpi/apei.h>
 #include <acpi/hed.h>
 
@@ -95,3 +98,7 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
 		(void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1) :
 		gdata + 1;
 }
+
+void ghes_notify_sea(void);
+
+#endif /* GHES_H */
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 05/10] acpi: apei: handle SEA notification type for ARMv8
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

ARM APEI extension proposal added SEA (Synchronous External Abort)
notification type for ARMv8.
Add a new GHES error source handling function for SEA. If an error
source's notification type is SEA, then this function can be registered
into the SEA exception handler. That way GHES will parse and report
SEA exceptions when they occur.
An SEA can interrupt code that had interrupts masked and is treated as
an NMI. To aid this the page of address space for mapping APEI buffers
while in_nmi() is always reserved, and ghes_ioremap_pfn_nmi() is
changed to use the helper methods to find the prot_t to map with in
the same way as ghes_ioremap_pfn_irq().

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/Kconfig        |  2 ++
 arch/arm64/mm/fault.c     | 13 +++++++++
 drivers/acpi/apei/Kconfig | 15 ++++++++++
 drivers/acpi/apei/ghes.c  | 70 +++++++++++++++++++++++++++++++++++++++++++----
 include/acpi/ghes.h       |  7 +++++
 5 files changed, 101 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 8c7c244..d542d17 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -18,6 +18,7 @@ config ARM64
 	select ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_HAS_STRICT_MODULE_RWX
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+	select ARCH_HAVE_NMI_SAFE_CMPXCHG if ACPI_APEI_SEA
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select ARCH_SUPPORTS_NUMA_BALANCING
@@ -92,6 +93,7 @@ config ARM64
 	select HAVE_IRQ_TIME_ACCOUNTING
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP if NUMA
+	select HAVE_NMI if ACPI_APEI_SEA
 	select HAVE_PATA_PLATFORM
 	select HAVE_PERF_EVENTS
 	select HAVE_PERF_REGS
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index e17633d..f7372ce 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -42,6 +42,8 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 
+#include <acpi/ghes.h>
+
 static const char *fault_name(unsigned int esr);
 
 #ifdef CONFIG_KPROBES
@@ -499,6 +501,17 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
 		 fault_name(esr), esr, addr);
 
+	/*
+	 * Synchronous aborts may interrupt code which had interrupts masked.
+	 * Before calling out into the wider kernel tell the interested
+	 * subsystems.
+	 */
+	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+		nmi_enter();
+		ghes_notify_sea();
+		nmi_exit();
+	}
+
 	info.si_signo = SIGBUS;
 	info.si_errno = 0;
 	info.si_code  = 0;
diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
index b0140c8..de14d49 100644
--- a/drivers/acpi/apei/Kconfig
+++ b/drivers/acpi/apei/Kconfig
@@ -39,6 +39,21 @@ config ACPI_APEI_PCIEAER
 	  PCIe AER errors may be reported via APEI firmware first mode.
 	  Turn on this option to enable the corresponding support.
 
+config ACPI_APEI_SEA
+	bool "APEI Synchronous External Abort logging/recovering support"
+	depends on ARM64 && ACPI_APEI_GHES
+	default y
+	help
+	  This option should be enabled if the system supports
+	  firmware first handling of SEA (Synchronous External Abort).
+	  SEA happens with certain faults of data abort or instruction
+	  abort synchronous exceptions on ARMv8 systems. If a system
+	  supports firmware first handling of SEA, the platform analyzes
+	  and handles hardware error notifications from SEA, and it may then
+	  form a HW error record for the OS to parse and handle. This
+	  option allows the OS to look for such hardware error record, and
+	  take appropriate action.
+
 config ACPI_APEI_MEMORY_FAILURE
 	bool "APEI memory error recovering support"
 	depends on ACPI_APEI && MEMORY_FAILURE
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 9ddbb93..b735a5c 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -115,11 +115,7 @@
  * Two virtual pages are used, one for IRQ/PROCESS context, the other for
  * NMI context (optionally).
  */
-#ifdef CONFIG_HAVE_ACPI_APEI_NMI
 #define GHES_IOREMAP_PAGES           2
-#else
-#define GHES_IOREMAP_PAGES           1
-#endif
 #define GHES_IOREMAP_IRQ_PAGE(base)	(base)
 #define GHES_IOREMAP_NMI_PAGE(base)	((base) + PAGE_SIZE)
 
@@ -158,10 +154,14 @@ static void ghes_ioremap_exit(void)
 static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
 {
 	unsigned long vaddr;
+	phys_addr_t paddr;
+	pgprot_t prot;
 
 	vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
-	ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
-			   pfn << PAGE_SHIFT, PAGE_KERNEL);
+
+	paddr = pfn << PAGE_SHIFT;
+	prot = arch_apei_get_mem_attribute(paddr);
+	ioremap_page_range(vaddr, vaddr + PAGE_SIZE, paddr, prot);
 
 	return (void __iomem *)vaddr;
 }
@@ -768,6 +768,50 @@ static int ghes_notify_sci(struct notifier_block *this,
 	.notifier_call = ghes_notify_sci,
 };
 
+#ifdef CONFIG_ACPI_APEI_SEA
+static LIST_HEAD(ghes_sea);
+
+void ghes_notify_sea(void)
+{
+	struct ghes *ghes;
+
+	/*
+	 * synchronize_rcu() will wait for nmi_exit(), so no need to
+	 * rcu_read_lock().
+	 */
+	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
+		ghes_proc(ghes);
+	}
+}
+
+static void ghes_sea_add(struct ghes *ghes)
+{
+	mutex_lock(&ghes_list_mutex);
+	list_add_rcu(&ghes->list, &ghes_sea);
+	mutex_unlock(&ghes_list_mutex);
+}
+
+static void ghes_sea_remove(struct ghes *ghes)
+{
+	mutex_lock(&ghes_list_mutex);
+	list_del_rcu(&ghes->list);
+	mutex_unlock(&ghes_list_mutex);
+	synchronize_rcu();
+}
+#else /* CONFIG_ACPI_APEI_SEA */
+static inline void ghes_sea_add(struct ghes *ghes)
+{
+	pr_err(GHES_PFX "ID: %d, trying to add SEA notification which is not supported\n",
+	       ghes->generic->header.source_id);
+}
+
+static inline void ghes_sea_remove(struct ghes *ghes)
+{
+	pr_err(GHES_PFX "ID: %d, trying to remove SEA notification which is not supported\n",
+	       ghes->generic->header.source_id);
+}
+#endif /* CONFIG_ACPI_APEI_SEA */
+
 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
 /*
  * printk is not safe in NMI context.  So in NMI handler, we allocate
@@ -1013,6 +1057,14 @@ static int ghes_probe(struct platform_device *ghes_dev)
 	case ACPI_HEST_NOTIFY_EXTERNAL:
 	case ACPI_HEST_NOTIFY_SCI:
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+			pr_warn(GHES_PFX "Generic hardware error source: %d notified via SEA is not supported\n",
+				generic->header.source_id);
+			rc = -ENOTSUPP;
+			goto err;
+		}
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
 			pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
@@ -1078,6 +1130,9 @@ static int ghes_probe(struct platform_device *ghes_dev)
 		list_add_rcu(&ghes->list, &ghes_sci);
 		mutex_unlock(&ghes_list_mutex);
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		ghes_sea_add(ghes);
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		ghes_nmi_add(ghes);
 		break;
@@ -1120,6 +1175,9 @@ static int ghes_remove(struct platform_device *ghes_dev)
 			unregister_acpi_hed_notifier(&ghes_notifier_sci);
 		mutex_unlock(&ghes_list_mutex);
 		break;
+	case ACPI_HEST_NOTIFY_SEA:
+		ghes_sea_remove(ghes);
+		break;
 	case ACPI_HEST_NOTIFY_NMI:
 		ghes_nmi_remove(ghes);
 		break;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 6ae318b..18bc935 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -1,3 +1,6 @@
+#ifndef GHES_H
+#define GHES_H
+
 #include <acpi/apei.h>
 #include <acpi/hed.h>
 
@@ -95,3 +98,7 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
 		(void *)(((struct acpi_hest_generic_data_v300 *)(gdata)) + 1) :
 		gdata + 1;
 }
+
+void ghes_notify_sea(void);
+
+#endif /* GHES_H */
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 06/10] acpi: apei: panic OS with fatal error status block
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

From: "Jonathan (Zhixiong) Zhang" <zjzhang@codeaurora.org>

Even if an error status block's severity is fatal, the kernel does not
honor the severity level and panic.

With the firmware first model, the platform could inform the OS about a
fatal hardware error through the non-NMI GHES notification type. The OS
should panic when a hardware error record is received with this
severity.

Call panic() after CPER data in error status block is printed if
severity is fatal, before each error section is handled.

Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/acpi/apei/ghes.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index b735a5c..7e3e5e0 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -134,6 +134,8 @@
 static struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
 static atomic_t ghes_estatus_cache_alloced;
 
+static int ghes_panic_timeout __read_mostly = 30;
+
 static int ghes_ioremap_init(void)
 {
 	ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
@@ -689,6 +691,13 @@ static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
 	return rc;
 }
 
+static void __ghes_call_panic(void)
+{
+	if (panic_timeout == 0)
+		panic_timeout = ghes_panic_timeout;
+	panic("Fatal hardware error!");
+}
+
 static int ghes_proc(struct ghes *ghes)
 {
 	int rc;
@@ -696,6 +705,10 @@ static int ghes_proc(struct ghes *ghes)
 	rc = ghes_read_estatus(ghes, 0);
 	if (rc)
 		goto out;
+	if (ghes_severity(ghes->estatus->error_severity) >= GHES_SEV_PANIC) {
+		__ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus);
+		__ghes_call_panic();
+	}
 	if (!ghes_estatus_cached(ghes->estatus)) {
 		if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
 			ghes_estatus_cache_add(ghes->generic, ghes->estatus);
@@ -832,8 +845,6 @@ static inline void ghes_sea_remove(struct ghes *ghes)
 
 static LIST_HEAD(ghes_nmi);
 
-static int ghes_panic_timeout	__read_mostly = 30;
-
 static void ghes_proc_in_irq(struct irq_work *irq_work)
 {
 	struct llist_node *llnode, *next;
@@ -926,9 +937,7 @@ static void __ghes_panic(struct ghes *ghes)
 	__ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus);
 
 	/* reboot to log the error! */
-	if (panic_timeout == 0)
-		panic_timeout = ghes_panic_timeout;
-	panic("Fatal hardware error!");
+	__ghes_call_panic();
 }
 
 static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 06/10] acpi: apei: panic OS with fatal error status block
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

From: "Jonathan (Zhixiong) Zhang" <zjzhang@codeaurora.org>

Even if an error status block's severity is fatal, the kernel does not
honor the severity level and panic.

With the firmware first model, the platform could inform the OS about a
fatal hardware error through the non-NMI GHES notification type. The OS
should panic when a hardware error record is received with this
severity.

Call panic() after CPER data in error status block is printed if
severity is fatal, before each error section is handled.

Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/acpi/apei/ghes.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index b735a5c..7e3e5e0 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -134,6 +134,8 @@
 static struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
 static atomic_t ghes_estatus_cache_alloced;
 
+static int ghes_panic_timeout __read_mostly = 30;
+
 static int ghes_ioremap_init(void)
 {
 	ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
@@ -689,6 +691,13 @@ static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
 	return rc;
 }
 
+static void __ghes_call_panic(void)
+{
+	if (panic_timeout == 0)
+		panic_timeout = ghes_panic_timeout;
+	panic("Fatal hardware error!");
+}
+
 static int ghes_proc(struct ghes *ghes)
 {
 	int rc;
@@ -696,6 +705,10 @@ static int ghes_proc(struct ghes *ghes)
 	rc = ghes_read_estatus(ghes, 0);
 	if (rc)
 		goto out;
+	if (ghes_severity(ghes->estatus->error_severity) >= GHES_SEV_PANIC) {
+		__ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus);
+		__ghes_call_panic();
+	}
 	if (!ghes_estatus_cached(ghes->estatus)) {
 		if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
 			ghes_estatus_cache_add(ghes->generic, ghes->estatus);
@@ -832,8 +845,6 @@ static inline void ghes_sea_remove(struct ghes *ghes)
 
 static LIST_HEAD(ghes_nmi);
 
-static int ghes_panic_timeout	__read_mostly = 30;
-
 static void ghes_proc_in_irq(struct irq_work *irq_work)
 {
 	struct llist_node *llnode, *next;
@@ -926,9 +937,7 @@ static void __ghes_panic(struct ghes *ghes)
 	__ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus);
 
 	/* reboot to log the error! */
-	if (panic_timeout == 0)
-		panic_timeout = ghes_panic_timeout;
-	panic("Fatal hardware error!");
+	__ghes_call_panic();
 }
 
 static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 06/10] acpi: apei: panic OS with fatal error status block
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

From: "Jonathan (Zhixiong) Zhang" <zjzhang@codeaurora.org>

Even if an error status block's severity is fatal, the kernel does not
honor the severity level and panic.

With the firmware first model, the platform could inform the OS about a
fatal hardware error through the non-NMI GHES notification type. The OS
should panic when a hardware error record is received with this
severity.

Call panic() after CPER data in error status block is printed if
severity is fatal, before each error section is handled.

Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/acpi/apei/ghes.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index b735a5c..7e3e5e0 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -134,6 +134,8 @@
 static struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
 static atomic_t ghes_estatus_cache_alloced;
 
+static int ghes_panic_timeout __read_mostly = 30;
+
 static int ghes_ioremap_init(void)
 {
 	ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
@@ -689,6 +691,13 @@ static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
 	return rc;
 }
 
+static void __ghes_call_panic(void)
+{
+	if (panic_timeout == 0)
+		panic_timeout = ghes_panic_timeout;
+	panic("Fatal hardware error!");
+}
+
 static int ghes_proc(struct ghes *ghes)
 {
 	int rc;
@@ -696,6 +705,10 @@ static int ghes_proc(struct ghes *ghes)
 	rc = ghes_read_estatus(ghes, 0);
 	if (rc)
 		goto out;
+	if (ghes_severity(ghes->estatus->error_severity) >= GHES_SEV_PANIC) {
+		__ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus);
+		__ghes_call_panic();
+	}
 	if (!ghes_estatus_cached(ghes->estatus)) {
 		if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
 			ghes_estatus_cache_add(ghes->generic, ghes->estatus);
@@ -832,8 +845,6 @@ static inline void ghes_sea_remove(struct ghes *ghes)
 
 static LIST_HEAD(ghes_nmi);
 
-static int ghes_panic_timeout	__read_mostly = 30;
-
 static void ghes_proc_in_irq(struct irq_work *irq_work)
 {
 	struct llist_node *llnode, *next;
@@ -926,9 +937,7 @@ static void __ghes_panic(struct ghes *ghes)
 	__ghes_print_estatus(KERN_EMERG, ghes->generic, ghes->estatus);
 
 	/* reboot to log the error! */
-	if (panic_timeout == 0)
-		panic_timeout = ghes_panic_timeout;
-	panic("Fatal hardware error!");
+	__ghes_call_panic();
 }
 
 static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 07/10] efi: print unrecognized CPER section
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

UEFI spec allows for non-standard section in Common Platform Error
Record. This is defined in section N.2.3 of UEFI version 2.5.

Currently if the CPER section's type (UUID) does not match with
one of the section types that the kernel knows how to parse, the
section is skipped. Therefore, user is not able to see
such CPER data, for instance, error record of non-standard section.

For above mentioned case, this change prints out the raw data in
hex in dmesg buffer. Data length is taken from Error Data length
field of Generic Error Data Entry.

The following is a sample output from dmesg:
[  140.739180] {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 2
[  140.739182] {1}[Hardware Error]: It has been corrected by h/w and requires no further action
[  140.739191] {1}[Hardware Error]: event severity: corrected
[  140.739196] {1}[Hardware Error]:  time: precise 2017-03-15 20:37:35
[  140.739197] {1}[Hardware Error]:  Error 0, type: corrected
[  140.739203] {1}[Hardware Error]:   section type: unknown, d2e2621c-f936-468d-0d84-15a4ed015c8b
[  140.739205] {1}[Hardware Error]:   section length: 568 (0x238)
[  140.739210] {1}[Hardware Error]:   00000000: 4d415201 4d492031 453a4d45 435f4343  .RAM1 IMEM:ECC_C
[  140.739214] {1}[Hardware Error]:   00000010: 53515f45 44525f42 00000000 00000000  E_QSB_RD........
[  140.739217] {1}[Hardware Error]:   00000020: 00000000 00000000 00000000 00000000  ................
[  140.739220] {1}[Hardware Error]:   00000030: 00000000 00000000 01010000 01010000  ................
[  140.739223] {1}[Hardware Error]:   00000040: 00000000 00000000 00000005 00000000  ................
[  140.739226] {1}[Hardware Error]:   00000050: 01010000 00000000 00000001 00dddd00  ................
...

The raw data from the error can then be decoded using vendor
specific tools.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/firmware/efi/cper.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 56aa516..d263bc8 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -591,8 +591,16 @@ static void cper_estatus_print_section(
 			cper_print_proc_arm(newpfx, arm_err);
 		else
 			goto err_section_too_small;
-	} else
-		printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
+	} else {
+		const void *unknown_err;
+
+		unknown_err = acpi_hest_generic_data_payload(gdata);
+		printk("%ssection type: unknown, %pUl\n", newpfx, sec_type);
+		printk("%ssection length: %d (%#x)\n", newpfx,
+		       gdata->error_data_length, gdata->error_data_length);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4,
+			       unknown_err, gdata->error_data_length, true);
+	}
 
 	return;
 
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 07/10] efi: print unrecognized CPER section
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

UEFI spec allows for non-standard section in Common Platform Error
Record. This is defined in section N.2.3 of UEFI version 2.5.

Currently if the CPER section's type (UUID) does not match with
one of the section types that the kernel knows how to parse, the
section is skipped. Therefore, user is not able to see
such CPER data, for instance, error record of non-standard section.

For above mentioned case, this change prints out the raw data in
hex in dmesg buffer. Data length is taken from Error Data length
field of Generic Error Data Entry.

The following is a sample output from dmesg:
[  140.739180] {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 2
[  140.739182] {1}[Hardware Error]: It has been corrected by h/w and requires no further action
[  140.739191] {1}[Hardware Error]: event severity: corrected
[  140.739196] {1}[Hardware Error]:  time: precise 2017-03-15 20:37:35
[  140.739197] {1}[Hardware Error]:  Error 0, type: corrected
[  140.739203] {1}[Hardware Error]:   section type: unknown, d2e2621c-f936-468d-0d84-15a4ed015c8b
[  140.739205] {1}[Hardware Error]:   section length: 568 (0x238)
[  140.739210] {1}[Hardware Error]:   00000000: 4d415201 4d492031 453a4d45 435f4343  .RAM1 IMEM:ECC_C
[  140.739214] {1}[Hardware Error]:   00000010: 53515f45 44525f42 00000000 00000000  E_QSB_RD........
[  140.739217] {1}[Hardware Error]:   00000020: 00000000 00000000 00000000 00000000  ................
[  140.739220] {1}[Hardware Error]:   00000030: 00000000 00000000 01010000 01010000  ................
[  140.739223] {1}[Hardware Error]:   00000040: 00000000 00000000 00000005 00000000  ................
[  140.739226] {1}[Hardware Error]:   00000050: 01010000 00000000 00000001 00dddd00  ................
...

The raw data from the error can then be decoded using vendor
specific tools.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/firmware/efi/cper.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 56aa516..d263bc8 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -591,8 +591,16 @@ static void cper_estatus_print_section(
 			cper_print_proc_arm(newpfx, arm_err);
 		else
 			goto err_section_too_small;
-	} else
-		printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
+	} else {
+		const void *unknown_err;
+
+		unknown_err = acpi_hest_generic_data_payload(gdata);
+		printk("%ssection type: unknown, %pUl\n", newpfx, sec_type);
+		printk("%ssection length: %d (%#x)\n", newpfx,
+		       gdata->error_data_length, gdata->error_data_length);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4,
+			       unknown_err, gdata->error_data_length, true);
+	}
 
 	return;
 
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 07/10] efi: print unrecognized CPER section
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

UEFI spec allows for non-standard section in Common Platform Error
Record. This is defined in section N.2.3 of UEFI version 2.5.

Currently if the CPER section's type (UUID) does not match with
one of the section types that the kernel knows how to parse, the
section is skipped. Therefore, user is not able to see
such CPER data, for instance, error record of non-standard section.

For above mentioned case, this change prints out the raw data in
hex in dmesg buffer. Data length is taken from Error Data length
field of Generic Error Data Entry.

The following is a sample output from dmesg:
[  140.739180] {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 2
[  140.739182] {1}[Hardware Error]: It has been corrected by h/w and requires no further action
[  140.739191] {1}[Hardware Error]: event severity: corrected
[  140.739196] {1}[Hardware Error]:  time: precise 2017-03-15 20:37:35
[  140.739197] {1}[Hardware Error]:  Error 0, type: corrected
[  140.739203] {1}[Hardware Error]:   section type: unknown, d2e2621c-f936-468d-0d84-15a4ed015c8b
[  140.739205] {1}[Hardware Error]:   section length: 568 (0x238)
[  140.739210] {1}[Hardware Error]:   00000000: 4d415201 4d492031 453a4d45 435f4343  .RAM1 IMEM:ECC_C
[  140.739214] {1}[Hardware Error]:   00000010: 53515f45 44525f42 00000000 00000000  E_QSB_RD........
[  140.739217] {1}[Hardware Error]:   00000020: 00000000 00000000 00000000 00000000  ................
[  140.739220] {1}[Hardware Error]:   00000030: 00000000 00000000 01010000 01010000  ................
[  140.739223] {1}[Hardware Error]:   00000040: 00000000 00000000 00000005 00000000  ................
[  140.739226] {1}[Hardware Error]:   00000050: 01010000 00000000 00000001 00dddd00  ................
...

The raw data from the error can then be decoded using vendor
specific tools.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: James Morse <james.morse@arm.com>
---
 drivers/firmware/efi/cper.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 56aa516..d263bc8 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -591,8 +591,16 @@ static void cper_estatus_print_section(
 			cper_print_proc_arm(newpfx, arm_err);
 		else
 			goto err_section_too_small;
-	} else
-		printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
+	} else {
+		const void *unknown_err;
+
+		unknown_err = acpi_hest_generic_data_payload(gdata);
+		printk("%ssection type: unknown, %pUl\n", newpfx, sec_type);
+		printk("%ssection length: %d (%#x)\n", newpfx,
+		       gdata->error_data_length, gdata->error_data_length);
+		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4,
+			       unknown_err, gdata->error_data_length, true);
+	}
 
 	return;
 
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 08/10] ras: acpi / apei: generate trace event for unrecognized CPER section
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

UEFI spec allows for non-standard section in Common Platform Error
Record. This is defined in section N.2.3 of UEFI version 2.5.

Currently if the CPER section's type (UUID) does not match with
any section type that the kernel knows how to parse, trace event
is not generated for such section. And thus user is not able to know
happening of such hardware error, including error record of
non-standard section.

This commit generates a trace event which contains raw error data
for unrecognized CPER section.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Tested-by: Shiju Jose <shiju.jose@huawei.com>
---
 drivers/acpi/apei/ghes.c | 24 ++++++++++++++++++++++--
 drivers/ras/ras.c        |  1 +
 include/ras/ras_event.h  | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 7e3e5e0..3ecbacc 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -45,11 +45,13 @@
 #include <linux/aer.h>
 #include <linux/nmi.h>
 #include <linux/sched/clock.h>
+#include <linux/uuid.h>
 
 #include <acpi/actbl1.h>
 #include <acpi/ghes.h>
 #include <acpi/apei.h>
 #include <asm/tlbflush.h>
+#include <ras/ras_event.h>
 
 #include "apei-internal.h"
 
@@ -454,11 +456,21 @@ static void ghes_do_proc(struct ghes *ghes,
 {
 	int sev, sec_sev;
 	struct acpi_hest_generic_data *gdata;
+	uuid_le sec_type;
+	uuid_le *fru_id = &NULL_UUID_LE;
+	char *fru_text = "";
 
 	sev = ghes_severity(estatus->error_severity);
 	apei_estatus_for_each_section(estatus, gdata) {
 		sec_sev = ghes_severity(gdata->error_severity);
-		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
+		sec_type = *(uuid_le *)gdata->section_type;
+
+		if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
+			fru_id = (uuid_le *)gdata->fru_id;
+		if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
+			fru_text = gdata->fru_text;
+
+		if (!uuid_le_cmp(sec_type,
 				 CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem_err;
 
@@ -469,7 +481,7 @@ static void ghes_do_proc(struct ghes *ghes,
 			ghes_handle_memory_failure(gdata, sev);
 		}
 #ifdef CONFIG_ACPI_APEI_PCIEAER
-		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
+		else if (!uuid_le_cmp(sec_type,
 				      CPER_SEC_PCIE)) {
 			struct cper_sec_pcie *pcie_err;
 
@@ -502,6 +514,14 @@ static void ghes_do_proc(struct ghes *ghes,
 
 		}
 #endif
+#ifdef CONFIG_RAS
+		else if (trace_unknown_sec_event_enabled()) {
+			void *unknown_err = acpi_hest_generic_data_payload(gdata);
+			trace_unknown_sec_event(&sec_type,
+					fru_id, fru_text, sec_sev,
+					unknown_err, gdata->error_data_length);
+		}
+#endif
 	}
 }
 
diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
index b67dd36..fb2500b 100644
--- a/drivers/ras/ras.c
+++ b/drivers/ras/ras.c
@@ -27,3 +27,4 @@ static int __init ras_init(void)
 EXPORT_TRACEPOINT_SYMBOL_GPL(extlog_mem_event);
 #endif
 EXPORT_TRACEPOINT_SYMBOL_GPL(mc_event);
+EXPORT_TRACEPOINT_SYMBOL_GPL(unknown_sec_event);
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 1791a12..5861b6f 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -162,6 +162,51 @@
 );
 
 /*
+ * Unknown Section Report
+ *
+ * This event is generated when hardware detected a hardware
+ * error event, which may be of non-standard section as defined
+ * in UEFI spec appendix "Common Platform Error Record", or may
+ * be of sections for which TRACE_EVENT is not defined.
+ *
+ */
+TRACE_EVENT(unknown_sec_event,
+
+	TP_PROTO(const uuid_le *sec_type,
+		 const uuid_le *fru_id,
+		 const char *fru_text,
+		 const u8 sev,
+		 const u8 *err,
+		 const u32 len),
+
+	TP_ARGS(sec_type, fru_id, fru_text, sev, err, len),
+
+	TP_STRUCT__entry(
+		__array(char, sec_type, 16)
+		__array(char, fru_id, 16)
+		__string(fru_text, fru_text)
+		__field(u8, sev)
+		__field(u32, len)
+		__dynamic_array(u8, buf, len)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->sec_type, sec_type, sizeof(uuid_le));
+		memcpy(__entry->fru_id, fru_id, sizeof(uuid_le));
+		__assign_str(fru_text, fru_text);
+		__entry->sev = sev;
+		__entry->len = len;
+		memcpy(__get_dynamic_array(buf), err, len);
+	),
+
+	TP_printk("severity: %d; sec type:%pU; FRU: %pU %s; data len:%d; raw data:%s",
+		  __entry->sev, __entry->sec_type,
+		  __entry->fru_id, __get_str(fru_text),
+		  __entry->len,
+		  __print_hex(__get_dynamic_array(buf), __entry->len))
+);
+
+/*
  * PCIe AER Trace event
  *
  * These events are generated when hardware detects a corrected or
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 08/10] ras: acpi / apei: generate trace event for unrecognized CPER section
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

UEFI spec allows for non-standard section in Common Platform Error
Record. This is defined in section N.2.3 of UEFI version 2.5.

Currently if the CPER section's type (UUID) does not match with
any section type that the kernel knows how to parse, trace event
is not generated for such section. And thus user is not able to know
happening of such hardware error, including error record of
non-standard section.

This commit generates a trace event which contains raw error data
for unrecognized CPER section.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Tested-by: Shiju Jose <shiju.jose@huawei.com>
---
 drivers/acpi/apei/ghes.c | 24 ++++++++++++++++++++++--
 drivers/ras/ras.c        |  1 +
 include/ras/ras_event.h  | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 7e3e5e0..3ecbacc 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -45,11 +45,13 @@
 #include <linux/aer.h>
 #include <linux/nmi.h>
 #include <linux/sched/clock.h>
+#include <linux/uuid.h>
 
 #include <acpi/actbl1.h>
 #include <acpi/ghes.h>
 #include <acpi/apei.h>
 #include <asm/tlbflush.h>
+#include <ras/ras_event.h>
 
 #include "apei-internal.h"
 
@@ -454,11 +456,21 @@ static void ghes_do_proc(struct ghes *ghes,
 {
 	int sev, sec_sev;
 	struct acpi_hest_generic_data *gdata;
+	uuid_le sec_type;
+	uuid_le *fru_id = &NULL_UUID_LE;
+	char *fru_text = "";
 
 	sev = ghes_severity(estatus->error_severity);
 	apei_estatus_for_each_section(estatus, gdata) {
 		sec_sev = ghes_severity(gdata->error_severity);
-		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
+		sec_type = *(uuid_le *)gdata->section_type;
+
+		if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
+			fru_id = (uuid_le *)gdata->fru_id;
+		if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
+			fru_text = gdata->fru_text;
+
+		if (!uuid_le_cmp(sec_type,
 				 CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem_err;
 
@@ -469,7 +481,7 @@ static void ghes_do_proc(struct ghes *ghes,
 			ghes_handle_memory_failure(gdata, sev);
 		}
 #ifdef CONFIG_ACPI_APEI_PCIEAER
-		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
+		else if (!uuid_le_cmp(sec_type,
 				      CPER_SEC_PCIE)) {
 			struct cper_sec_pcie *pcie_err;
 
@@ -502,6 +514,14 @@ static void ghes_do_proc(struct ghes *ghes,
 
 		}
 #endif
+#ifdef CONFIG_RAS
+		else if (trace_unknown_sec_event_enabled()) {
+			void *unknown_err = acpi_hest_generic_data_payload(gdata);
+			trace_unknown_sec_event(&sec_type,
+					fru_id, fru_text, sec_sev,
+					unknown_err, gdata->error_data_length);
+		}
+#endif
 	}
 }
 
diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
index b67dd36..fb2500b 100644
--- a/drivers/ras/ras.c
+++ b/drivers/ras/ras.c
@@ -27,3 +27,4 @@ static int __init ras_init(void)
 EXPORT_TRACEPOINT_SYMBOL_GPL(extlog_mem_event);
 #endif
 EXPORT_TRACEPOINT_SYMBOL_GPL(mc_event);
+EXPORT_TRACEPOINT_SYMBOL_GPL(unknown_sec_event);
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 1791a12..5861b6f 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -162,6 +162,51 @@
 );
 
 /*
+ * Unknown Section Report
+ *
+ * This event is generated when hardware detected a hardware
+ * error event, which may be of non-standard section as defined
+ * in UEFI spec appendix "Common Platform Error Record", or may
+ * be of sections for which TRACE_EVENT is not defined.
+ *
+ */
+TRACE_EVENT(unknown_sec_event,
+
+	TP_PROTO(const uuid_le *sec_type,
+		 const uuid_le *fru_id,
+		 const char *fru_text,
+		 const u8 sev,
+		 const u8 *err,
+		 const u32 len),
+
+	TP_ARGS(sec_type, fru_id, fru_text, sev, err, len),
+
+	TP_STRUCT__entry(
+		__array(char, sec_type, 16)
+		__array(char, fru_id, 16)
+		__string(fru_text, fru_text)
+		__field(u8, sev)
+		__field(u32, len)
+		__dynamic_array(u8, buf, len)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->sec_type, sec_type, sizeof(uuid_le));
+		memcpy(__entry->fru_id, fru_id, sizeof(uuid_le));
+		__assign_str(fru_text, fru_text);
+		__entry->sev = sev;
+		__entry->len = len;
+		memcpy(__get_dynamic_array(buf), err, len);
+	),
+
+	TP_printk("severity: %d; sec type:%pU; FRU: %pU %s; data len:%d; raw data:%s",
+		  __entry->sev, __entry->sec_type,
+		  __entry->fru_id, __get_str(fru_text),
+		  __entry->len,
+		  __print_hex(__get_dynamic_array(buf), __entry->len))
+);
+
+/*
  * PCIe AER Trace event
  *
  * These events are generated when hardware detects a corrected or
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 08/10] ras: acpi / apei: generate trace event for unrecognized CPER section
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

UEFI spec allows for non-standard section in Common Platform Error
Record. This is defined in section N.2.3 of UEFI version 2.5.

Currently if the CPER section's type (UUID) does not match with
any section type that the kernel knows how to parse, trace event
is not generated for such section. And thus user is not able to know
happening of such hardware error, including error record of
non-standard section.

This commit generates a trace event which contains raw error data
for unrecognized CPER section.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Tested-by: Shiju Jose <shiju.jose@huawei.com>
---
 drivers/acpi/apei/ghes.c | 24 ++++++++++++++++++++++--
 drivers/ras/ras.c        |  1 +
 include/ras/ras_event.h  | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 7e3e5e0..3ecbacc 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -45,11 +45,13 @@
 #include <linux/aer.h>
 #include <linux/nmi.h>
 #include <linux/sched/clock.h>
+#include <linux/uuid.h>
 
 #include <acpi/actbl1.h>
 #include <acpi/ghes.h>
 #include <acpi/apei.h>
 #include <asm/tlbflush.h>
+#include <ras/ras_event.h>
 
 #include "apei-internal.h"
 
@@ -454,11 +456,21 @@ static void ghes_do_proc(struct ghes *ghes,
 {
 	int sev, sec_sev;
 	struct acpi_hest_generic_data *gdata;
+	uuid_le sec_type;
+	uuid_le *fru_id = &NULL_UUID_LE;
+	char *fru_text = "";
 
 	sev = ghes_severity(estatus->error_severity);
 	apei_estatus_for_each_section(estatus, gdata) {
 		sec_sev = ghes_severity(gdata->error_severity);
-		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
+		sec_type = *(uuid_le *)gdata->section_type;
+
+		if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
+			fru_id = (uuid_le *)gdata->fru_id;
+		if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
+			fru_text = gdata->fru_text;
+
+		if (!uuid_le_cmp(sec_type,
 				 CPER_SEC_PLATFORM_MEM)) {
 			struct cper_sec_mem_err *mem_err;
 
@@ -469,7 +481,7 @@ static void ghes_do_proc(struct ghes *ghes,
 			ghes_handle_memory_failure(gdata, sev);
 		}
 #ifdef CONFIG_ACPI_APEI_PCIEAER
-		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
+		else if (!uuid_le_cmp(sec_type,
 				      CPER_SEC_PCIE)) {
 			struct cper_sec_pcie *pcie_err;
 
@@ -502,6 +514,14 @@ static void ghes_do_proc(struct ghes *ghes,
 
 		}
 #endif
+#ifdef CONFIG_RAS
+		else if (trace_unknown_sec_event_enabled()) {
+			void *unknown_err = acpi_hest_generic_data_payload(gdata);
+			trace_unknown_sec_event(&sec_type,
+					fru_id, fru_text, sec_sev,
+					unknown_err, gdata->error_data_length);
+		}
+#endif
 	}
 }
 
diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
index b67dd36..fb2500b 100644
--- a/drivers/ras/ras.c
+++ b/drivers/ras/ras.c
@@ -27,3 +27,4 @@ static int __init ras_init(void)
 EXPORT_TRACEPOINT_SYMBOL_GPL(extlog_mem_event);
 #endif
 EXPORT_TRACEPOINT_SYMBOL_GPL(mc_event);
+EXPORT_TRACEPOINT_SYMBOL_GPL(unknown_sec_event);
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 1791a12..5861b6f 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -162,6 +162,51 @@
 );
 
 /*
+ * Unknown Section Report
+ *
+ * This event is generated when hardware detected a hardware
+ * error event, which may be of non-standard section as defined
+ * in UEFI spec appendix "Common Platform Error Record", or may
+ * be of sections for which TRACE_EVENT is not defined.
+ *
+ */
+TRACE_EVENT(unknown_sec_event,
+
+	TP_PROTO(const uuid_le *sec_type,
+		 const uuid_le *fru_id,
+		 const char *fru_text,
+		 const u8 sev,
+		 const u8 *err,
+		 const u32 len),
+
+	TP_ARGS(sec_type, fru_id, fru_text, sev, err, len),
+
+	TP_STRUCT__entry(
+		__array(char, sec_type, 16)
+		__array(char, fru_id, 16)
+		__string(fru_text, fru_text)
+		__field(u8, sev)
+		__field(u32, len)
+		__dynamic_array(u8, buf, len)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->sec_type, sec_type, sizeof(uuid_le));
+		memcpy(__entry->fru_id, fru_id, sizeof(uuid_le));
+		__assign_str(fru_text, fru_text);
+		__entry->sev = sev;
+		__entry->len = len;
+		memcpy(__get_dynamic_array(buf), err, len);
+	),
+
+	TP_printk("severity: %d; sec type:%pU; FRU: %pU %s; data len:%d; raw data:%s",
+		  __entry->sev, __entry->sec_type,
+		  __entry->fru_id, __get_str(fru_text),
+		  __entry->len,
+		  __print_hex(__get_dynamic_array(buf), __entry->len))
+);
+
+/*
  * PCIe AER Trace event
  *
  * These events are generated when hardware detects a corrected or
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 09/10] trace, ras: add ARM processor error trace event
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

Currently there are trace events for the various RAS
errors with the exception of ARM processor type errors.
Add a new trace event for such errors so that the user
will know when they occur. These trace events are
consistent with the ARM processor error section type
defined in UEFI 2.6 spec section N.2.4.4.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
---
 drivers/acpi/apei/ghes.c    |  8 +++++++-
 drivers/firmware/efi/cper.c |  1 +
 drivers/ras/ras.c           |  1 +
 include/ras/ras_event.h     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 3ecbacc..230b095 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -515,7 +515,13 @@ static void ghes_do_proc(struct ghes *ghes,
 		}
 #endif
 #ifdef CONFIG_RAS
-		else if (trace_unknown_sec_event_enabled()) {
+		else if (!uuid_le_cmp(sec_type, CPER_SEC_PROC_ARM) &&
+			 trace_arm_event_enabled()) {
+			struct cper_sec_proc_arm *arm_err;
+
+			arm_err = acpi_hest_generic_data_payload(gdata);
+			trace_arm_event(arm_err);
+		} else if (trace_unknown_sec_event_enabled()) {
 			void *unknown_err = acpi_hest_generic_data_payload(gdata);
 			trace_unknown_sec_event(&sec_type,
 					fru_id, fru_text, sec_sev,
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index d263bc8..37a39af 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -35,6 +35,7 @@
 #include <linux/printk.h>
 #include <linux/bcd.h>
 #include <acpi/ghes.h>
+#include <ras/ras_event.h>
 
 #define INDENT_SP	" "
 
diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
index fb2500b..8ba5a94 100644
--- a/drivers/ras/ras.c
+++ b/drivers/ras/ras.c
@@ -28,3 +28,4 @@ static int __init ras_init(void)
 #endif
 EXPORT_TRACEPOINT_SYMBOL_GPL(mc_event);
 EXPORT_TRACEPOINT_SYMBOL_GPL(unknown_sec_event);
+EXPORT_TRACEPOINT_SYMBOL_GPL(arm_event);
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 5861b6f..13befad 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -162,6 +162,51 @@
 );
 
 /*
+ * ARM Processor Events Report
+ *
+ * This event is generated when hardware detects an ARM processor error
+ * has occurred. UEFI 2.6 spec section N.2.4.4.
+ */
+TRACE_EVENT(arm_event,
+
+	TP_PROTO(const struct cper_sec_proc_arm *proc),
+
+	TP_ARGS(proc),
+
+	TP_STRUCT__entry(
+		__field(u64, mpidr)
+		__field(u64, midr)
+		__field(u32, running_state)
+		__field(u32, psci_state)
+		__field(u8, affinity)
+	),
+
+	TP_fast_assign(
+		if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL)
+			__entry->affinity = proc->affinity_level;
+		else
+			__entry->affinity = ~0;
+		if (proc->validation_bits & CPER_ARM_VALID_MPIDR)
+			__entry->mpidr = proc->mpidr;
+		else
+			__entry->mpidr = 0ULL;
+		__entry->midr = proc->midr;
+		if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) {
+			__entry->running_state = proc->running_state;
+			__entry->psci_state = proc->psci_state;
+		} else {
+			__entry->running_state = ~0;
+			__entry->psci_state = ~0;
+		}
+	),
+
+	TP_printk("affinity level: %d; MPIDR: %016llx; MIDR: %016llx; "
+		  "running state: %d; PSCI state: %d",
+		  __entry->affinity, __entry->mpidr, __entry->midr,
+		  __entry->running_state, __entry->psci_state)
+);
+
+/*
  * Unknown Section Report
  *
  * This event is generated when hardware detected a hardware
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 09/10] trace, ras: add ARM processor error trace event
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

Currently there are trace events for the various RAS
errors with the exception of ARM processor type errors.
Add a new trace event for such errors so that the user
will know when they occur. These trace events are
consistent with the ARM processor error section type
defined in UEFI 2.6 spec section N.2.4.4.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
---
 drivers/acpi/apei/ghes.c    |  8 +++++++-
 drivers/firmware/efi/cper.c |  1 +
 drivers/ras/ras.c           |  1 +
 include/ras/ras_event.h     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 3ecbacc..230b095 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -515,7 +515,13 @@ static void ghes_do_proc(struct ghes *ghes,
 		}
 #endif
 #ifdef CONFIG_RAS
-		else if (trace_unknown_sec_event_enabled()) {
+		else if (!uuid_le_cmp(sec_type, CPER_SEC_PROC_ARM) &&
+			 trace_arm_event_enabled()) {
+			struct cper_sec_proc_arm *arm_err;
+
+			arm_err = acpi_hest_generic_data_payload(gdata);
+			trace_arm_event(arm_err);
+		} else if (trace_unknown_sec_event_enabled()) {
 			void *unknown_err = acpi_hest_generic_data_payload(gdata);
 			trace_unknown_sec_event(&sec_type,
 					fru_id, fru_text, sec_sev,
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index d263bc8..37a39af 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -35,6 +35,7 @@
 #include <linux/printk.h>
 #include <linux/bcd.h>
 #include <acpi/ghes.h>
+#include <ras/ras_event.h>
 
 #define INDENT_SP	" "
 
diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
index fb2500b..8ba5a94 100644
--- a/drivers/ras/ras.c
+++ b/drivers/ras/ras.c
@@ -28,3 +28,4 @@ static int __init ras_init(void)
 #endif
 EXPORT_TRACEPOINT_SYMBOL_GPL(mc_event);
 EXPORT_TRACEPOINT_SYMBOL_GPL(unknown_sec_event);
+EXPORT_TRACEPOINT_SYMBOL_GPL(arm_event);
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 5861b6f..13befad 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -162,6 +162,51 @@
 );
 
 /*
+ * ARM Processor Events Report
+ *
+ * This event is generated when hardware detects an ARM processor error
+ * has occurred. UEFI 2.6 spec section N.2.4.4.
+ */
+TRACE_EVENT(arm_event,
+
+	TP_PROTO(const struct cper_sec_proc_arm *proc),
+
+	TP_ARGS(proc),
+
+	TP_STRUCT__entry(
+		__field(u64, mpidr)
+		__field(u64, midr)
+		__field(u32, running_state)
+		__field(u32, psci_state)
+		__field(u8, affinity)
+	),
+
+	TP_fast_assign(
+		if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL)
+			__entry->affinity = proc->affinity_level;
+		else
+			__entry->affinity = ~0;
+		if (proc->validation_bits & CPER_ARM_VALID_MPIDR)
+			__entry->mpidr = proc->mpidr;
+		else
+			__entry->mpidr = 0ULL;
+		__entry->midr = proc->midr;
+		if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) {
+			__entry->running_state = proc->running_state;
+			__entry->psci_state = proc->psci_state;
+		} else {
+			__entry->running_state = ~0;
+			__entry->psci_state = ~0;
+		}
+	),
+
+	TP_printk("affinity level: %d; MPIDR: %016llx; MIDR: %016llx; "
+		  "running state: %d; PSCI state: %d",
+		  __entry->affinity, __entry->mpidr, __entry->midr,
+		  __entry->running_state, __entry->psci_state)
+);
+
+/*
  * Unknown Section Report
  *
  * This event is generated when hardware detected a hardware
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 09/10] trace, ras: add ARM processor error trace event
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

Currently there are trace events for the various RAS
errors with the exception of ARM processor type errors.
Add a new trace event for such errors so that the user
will know when they occur. These trace events are
consistent with the ARM processor error section type
defined in UEFI 2.6 spec section N.2.4.4.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
---
 drivers/acpi/apei/ghes.c    |  8 +++++++-
 drivers/firmware/efi/cper.c |  1 +
 drivers/ras/ras.c           |  1 +
 include/ras/ras_event.h     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 3ecbacc..230b095 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -515,7 +515,13 @@ static void ghes_do_proc(struct ghes *ghes,
 		}
 #endif
 #ifdef CONFIG_RAS
-		else if (trace_unknown_sec_event_enabled()) {
+		else if (!uuid_le_cmp(sec_type, CPER_SEC_PROC_ARM) &&
+			 trace_arm_event_enabled()) {
+			struct cper_sec_proc_arm *arm_err;
+
+			arm_err = acpi_hest_generic_data_payload(gdata);
+			trace_arm_event(arm_err);
+		} else if (trace_unknown_sec_event_enabled()) {
 			void *unknown_err = acpi_hest_generic_data_payload(gdata);
 			trace_unknown_sec_event(&sec_type,
 					fru_id, fru_text, sec_sev,
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index d263bc8..37a39af 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -35,6 +35,7 @@
 #include <linux/printk.h>
 #include <linux/bcd.h>
 #include <acpi/ghes.h>
+#include <ras/ras_event.h>
 
 #define INDENT_SP	" "
 
diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
index fb2500b..8ba5a94 100644
--- a/drivers/ras/ras.c
+++ b/drivers/ras/ras.c
@@ -28,3 +28,4 @@ static int __init ras_init(void)
 #endif
 EXPORT_TRACEPOINT_SYMBOL_GPL(mc_event);
 EXPORT_TRACEPOINT_SYMBOL_GPL(unknown_sec_event);
+EXPORT_TRACEPOINT_SYMBOL_GPL(arm_event);
diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 5861b6f..13befad 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -162,6 +162,51 @@
 );
 
 /*
+ * ARM Processor Events Report
+ *
+ * This event is generated when hardware detects an ARM processor error
+ * has occurred. UEFI 2.6 spec section N.2.4.4.
+ */
+TRACE_EVENT(arm_event,
+
+	TP_PROTO(const struct cper_sec_proc_arm *proc),
+
+	TP_ARGS(proc),
+
+	TP_STRUCT__entry(
+		__field(u64, mpidr)
+		__field(u64, midr)
+		__field(u32, running_state)
+		__field(u32, psci_state)
+		__field(u8, affinity)
+	),
+
+	TP_fast_assign(
+		if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL)
+			__entry->affinity = proc->affinity_level;
+		else
+			__entry->affinity = ~0;
+		if (proc->validation_bits & CPER_ARM_VALID_MPIDR)
+			__entry->mpidr = proc->mpidr;
+		else
+			__entry->mpidr = 0ULL;
+		__entry->midr = proc->midr;
+		if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) {
+			__entry->running_state = proc->running_state;
+			__entry->psci_state = proc->psci_state;
+		} else {
+			__entry->running_state = ~0;
+			__entry->psci_state = ~0;
+		}
+	),
+
+	TP_printk("affinity level: %d; MPIDR: %016llx; MIDR: %016llx; "
+		  "running state: %d; PSCI state: %d",
+		  __entry->affinity, __entry->mpidr, __entry->midr,
+		  __entry->running_state, __entry->psci_state)
+);
+
+/*
  * Unknown Section Report
  *
  * This event is generated when hardware detected a hardware
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-03-28 19:30   ` Tyler Baicar
  -1 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba
  Cc: Tyler Baicar

Currently external aborts are unsupported by the guest abort
handling. Add handling for SEAs so that the host kernel reports
SEAs which occur in the guest kernel.

When an SEA occurs in the guest kernel, the guest exits and is
routed to kvm_handle_guest_abort(). Prior to this patch, a print
message of an unsupported FSC would be printed and nothing else
would happen. With this patch, the code gets routed to the APEI
handling of SEAs in the host kernel to report the SEA information.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
 arch/arm/include/asm/system_misc.h   |  5 +++++
 arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
 arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
 arch/arm64/include/asm/system_misc.h |  2 ++
 arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
 drivers/acpi/apei/ghes.c             | 13 +++++++------
 include/acpi/ghes.h                  |  2 +-
 8 files changed, 87 insertions(+), 12 deletions(-)

diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
index a3f0b3d..ebf020b 100644
--- a/arch/arm/include/asm/kvm_arm.h
+++ b/arch/arm/include/asm/kvm_arm.h
@@ -187,6 +187,16 @@
 #define FSC_FAULT	(0x04)
 #define FSC_ACCESS	(0x08)
 #define FSC_PERM	(0x0c)
+#define FSC_SEA		(0x10)
+#define FSC_SEA_TTW0	(0x14)
+#define FSC_SEA_TTW1	(0x15)
+#define FSC_SEA_TTW2	(0x16)
+#define FSC_SEA_TTW3	(0x17)
+#define FSC_SECC	(0x18)
+#define FSC_SECC_TTW0	(0x1c)
+#define FSC_SECC_TTW1	(0x1d)
+#define FSC_SECC_TTW2	(0x1e)
+#define FSC_SECC_TTW3	(0x1f)
 
 /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
 #define HPFAR_MASK	(~0xf)
diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
index a3d61ad..8c4a89f 100644
--- a/arch/arm/include/asm/system_misc.h
+++ b/arch/arm/include/asm/system_misc.h
@@ -22,6 +22,11 @@
 
 extern unsigned int user_debug;
 
+static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
+{
+	return -1;
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_ARM_SYSTEM_MISC_H */
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 962616f..9a977c8 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -29,6 +29,7 @@
 #include <asm/kvm_asm.h>
 #include <asm/kvm_emulate.h>
 #include <asm/virt.h>
+#include <asm/system_misc.h>
 
 #include "trace.h"
 
@@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
 		kvm_set_pfn_accessed(pfn);
 }
 
+static bool is_abort_sea(unsigned long fault_status) {
+	switch (fault_status) {
+	case FSC_SEA:
+	case FSC_SEA_TTW0:
+	case FSC_SEA_TTW1:
+	case FSC_SEA_TTW2:
+	case FSC_SEA_TTW3:
+	case FSC_SECC:
+	case FSC_SECC_TTW0:
+	case FSC_SECC_TTW1:
+	case FSC_SECC_TTW2:
+	case FSC_SECC_TTW3:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /**
  * kvm_handle_guest_abort - handles all 2nd stage aborts
  * @vcpu:	the VCPU pointer
@@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	gfn_t gfn;
 	int ret, idx;
 
+	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
+
+	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
+
+	/*
+	 * The host kernel will handle the synchronous external abort. There
+	 * is no need to pass the error into the guest.
+	 */
+	if (is_abort_sea(fault_status))
+		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
+			return 1;
+
 	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
 	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
 		kvm_inject_vabt(vcpu);
 		return 1;
 	}
 
-	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
-
 	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
 			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
 
 	/* Check the stage-2 fault is trans. fault or write fault */
-	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
 	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
 	    fault_status != FSC_ACCESS) {
 		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 6e99978..61d694c 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -204,6 +204,16 @@
 #define FSC_FAULT	ESR_ELx_FSC_FAULT
 #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
 #define FSC_PERM	ESR_ELx_FSC_PERM
+#define FSC_SEA		ESR_ELx_FSC_EXTABT
+#define FSC_SEA_TTW0	(0x14)
+#define FSC_SEA_TTW1	(0x15)
+#define FSC_SEA_TTW2	(0x16)
+#define FSC_SEA_TTW3	(0x17)
+#define FSC_SECC	(0x18)
+#define FSC_SECC_TTW0	(0x1c)
+#define FSC_SECC_TTW1	(0x1d)
+#define FSC_SECC_TTW2	(0x1e)
+#define FSC_SECC_TTW3	(0x1f)
 
 /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
 #define HPFAR_MASK	(~UL(0xf))
diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
index bc81243..95aa442 100644
--- a/arch/arm64/include/asm/system_misc.h
+++ b/arch/arm64/include/asm/system_misc.h
@@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
 	__show_ratelimited;						\
 })
 
+int handle_guest_sea(phys_addr_t addr, unsigned int esr);
+
 #endif	/* __ASSEMBLY__ */
 
 #endif	/* __ASM_SYSTEM_MISC_H */
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index f7372ce..3abb367 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 {
 	struct siginfo info;
+	int ret = 0;
 
 	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
 		 fault_name(esr), esr, addr);
@@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	 */
 	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
 		nmi_enter();
-		ghes_notify_sea();
+		ret = ghes_notify_sea();
 		nmi_exit();
 	}
 
@@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 		info.si_addr  = (void __user *)addr;
 	arm64_notify_die("", regs, &info, esr);
 
-	return 0;
+	return ret;
 }
 
 static const struct fault_info {
@@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
 }
 
 /*
+ * Handle Synchronous External Aborts that occur in a guest kernel.
+ *
+ * The return value will be zero if the SEA was successfully handled
+ * and non-zero if there was an error processing the error or there was
+ * no error to process.
+ */
+int handle_guest_sea(phys_addr_t addr, unsigned int esr)
+{
+	int ret = -ENOENT;
+
+	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+		ret = ghes_notify_sea();
+	}
+
+	return ret;
+}
+
+/*
  * Dispatch a data abort to the relevant handler.
  */
 asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 230b095..81eabc6 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
 #ifdef CONFIG_ACPI_APEI_SEA
 static LIST_HEAD(ghes_sea);
 
-void ghes_notify_sea(void)
+int ghes_notify_sea(void)
 {
 	struct ghes *ghes;
+	int ret = -ENOENT;
 
-	/*
-	 * synchronize_rcu() will wait for nmi_exit(), so no need to
-	 * rcu_read_lock().
-	 */
+	rcu_read_lock();
 	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
-		ghes_proc(ghes);
+		if(!ghes_proc(ghes))
+			ret = 0;
 	}
+	rcu_read_unlock();
+	return ret;
 }
 
 static void ghes_sea_add(struct ghes *ghes)
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 18bc935..2a727dc 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
 		gdata + 1;
 }
 
-void ghes_notify_sea(void);
+int ghes_notify_sea(void);
 
 #endif /* GHES_H */
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi
  Cc: Tyler Baicar

Currently external aborts are unsupported by the guest abort
handling. Add handling for SEAs so that the host kernel reports
SEAs which occur in the guest kernel.

When an SEA occurs in the guest kernel, the guest exits and is
routed to kvm_handle_guest_abort(). Prior to this patch, a print
message of an unsupported FSC would be printed and nothing else
would happen. With this patch, the code gets routed to the APEI
handling of SEAs in the host kernel to report the SEA information.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
 arch/arm/include/asm/system_misc.h   |  5 +++++
 arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
 arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
 arch/arm64/include/asm/system_misc.h |  2 ++
 arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
 drivers/acpi/apei/ghes.c             | 13 +++++++------
 include/acpi/ghes.h                  |  2 +-
 8 files changed, 87 insertions(+), 12 deletions(-)

diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
index a3f0b3d..ebf020b 100644
--- a/arch/arm/include/asm/kvm_arm.h
+++ b/arch/arm/include/asm/kvm_arm.h
@@ -187,6 +187,16 @@
 #define FSC_FAULT	(0x04)
 #define FSC_ACCESS	(0x08)
 #define FSC_PERM	(0x0c)
+#define FSC_SEA		(0x10)
+#define FSC_SEA_TTW0	(0x14)
+#define FSC_SEA_TTW1	(0x15)
+#define FSC_SEA_TTW2	(0x16)
+#define FSC_SEA_TTW3	(0x17)
+#define FSC_SECC	(0x18)
+#define FSC_SECC_TTW0	(0x1c)
+#define FSC_SECC_TTW1	(0x1d)
+#define FSC_SECC_TTW2	(0x1e)
+#define FSC_SECC_TTW3	(0x1f)
 
 /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
 #define HPFAR_MASK	(~0xf)
diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
index a3d61ad..8c4a89f 100644
--- a/arch/arm/include/asm/system_misc.h
+++ b/arch/arm/include/asm/system_misc.h
@@ -22,6 +22,11 @@
 
 extern unsigned int user_debug;
 
+static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
+{
+	return -1;
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_ARM_SYSTEM_MISC_H */
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 962616f..9a977c8 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -29,6 +29,7 @@
 #include <asm/kvm_asm.h>
 #include <asm/kvm_emulate.h>
 #include <asm/virt.h>
+#include <asm/system_misc.h>
 
 #include "trace.h"
 
@@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
 		kvm_set_pfn_accessed(pfn);
 }
 
+static bool is_abort_sea(unsigned long fault_status) {
+	switch (fault_status) {
+	case FSC_SEA:
+	case FSC_SEA_TTW0:
+	case FSC_SEA_TTW1:
+	case FSC_SEA_TTW2:
+	case FSC_SEA_TTW3:
+	case FSC_SECC:
+	case FSC_SECC_TTW0:
+	case FSC_SECC_TTW1:
+	case FSC_SECC_TTW2:
+	case FSC_SECC_TTW3:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /**
  * kvm_handle_guest_abort - handles all 2nd stage aborts
  * @vcpu:	the VCPU pointer
@@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	gfn_t gfn;
 	int ret, idx;
 
+	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
+
+	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
+
+	/*
+	 * The host kernel will handle the synchronous external abort. There
+	 * is no need to pass the error into the guest.
+	 */
+	if (is_abort_sea(fault_status))
+		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
+			return 1;
+
 	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
 	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
 		kvm_inject_vabt(vcpu);
 		return 1;
 	}
 
-	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
-
 	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
 			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
 
 	/* Check the stage-2 fault is trans. fault or write fault */
-	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
 	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
 	    fault_status != FSC_ACCESS) {
 		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 6e99978..61d694c 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -204,6 +204,16 @@
 #define FSC_FAULT	ESR_ELx_FSC_FAULT
 #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
 #define FSC_PERM	ESR_ELx_FSC_PERM
+#define FSC_SEA		ESR_ELx_FSC_EXTABT
+#define FSC_SEA_TTW0	(0x14)
+#define FSC_SEA_TTW1	(0x15)
+#define FSC_SEA_TTW2	(0x16)
+#define FSC_SEA_TTW3	(0x17)
+#define FSC_SECC	(0x18)
+#define FSC_SECC_TTW0	(0x1c)
+#define FSC_SECC_TTW1	(0x1d)
+#define FSC_SECC_TTW2	(0x1e)
+#define FSC_SECC_TTW3	(0x1f)
 
 /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
 #define HPFAR_MASK	(~UL(0xf))
diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
index bc81243..95aa442 100644
--- a/arch/arm64/include/asm/system_misc.h
+++ b/arch/arm64/include/asm/system_misc.h
@@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
 	__show_ratelimited;						\
 })
 
+int handle_guest_sea(phys_addr_t addr, unsigned int esr);
+
 #endif	/* __ASSEMBLY__ */
 
 #endif	/* __ASM_SYSTEM_MISC_H */
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index f7372ce..3abb367 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 {
 	struct siginfo info;
+	int ret = 0;
 
 	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
 		 fault_name(esr), esr, addr);
@@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	 */
 	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
 		nmi_enter();
-		ghes_notify_sea();
+		ret = ghes_notify_sea();
 		nmi_exit();
 	}
 
@@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 		info.si_addr  = (void __user *)addr;
 	arm64_notify_die("", regs, &info, esr);
 
-	return 0;
+	return ret;
 }
 
 static const struct fault_info {
@@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
 }
 
 /*
+ * Handle Synchronous External Aborts that occur in a guest kernel.
+ *
+ * The return value will be zero if the SEA was successfully handled
+ * and non-zero if there was an error processing the error or there was
+ * no error to process.
+ */
+int handle_guest_sea(phys_addr_t addr, unsigned int esr)
+{
+	int ret = -ENOENT;
+
+	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+		ret = ghes_notify_sea();
+	}
+
+	return ret;
+}
+
+/*
  * Dispatch a data abort to the relevant handler.
  */
 asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 230b095..81eabc6 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
 #ifdef CONFIG_ACPI_APEI_SEA
 static LIST_HEAD(ghes_sea);
 
-void ghes_notify_sea(void)
+int ghes_notify_sea(void)
 {
 	struct ghes *ghes;
+	int ret = -ENOENT;
 
-	/*
-	 * synchronize_rcu() will wait for nmi_exit(), so no need to
-	 * rcu_read_lock().
-	 */
+	rcu_read_lock();
 	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
-		ghes_proc(ghes);
+		if(!ghes_proc(ghes))
+			ret = 0;
 	}
+	rcu_read_unlock();
+	return ret;
 }
 
 static void ghes_sea_add(struct ghes *ghes)
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 18bc935..2a727dc 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
 		gdata + 1;
 }
 
-void ghes_notify_sea(void);
+int ghes_notify_sea(void);
 
 #endif /* GHES_H */
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
@ 2017-03-28 19:30   ` Tyler Baicar
  0 siblings, 0 replies; 80+ messages in thread
From: Tyler Baicar @ 2017-03-28 19:30 UTC (permalink / raw)
  To: linux-arm-kernel

Currently external aborts are unsupported by the guest abort
handling. Add handling for SEAs so that the host kernel reports
SEAs which occur in the guest kernel.

When an SEA occurs in the guest kernel, the guest exits and is
routed to kvm_handle_guest_abort(). Prior to this patch, a print
message of an unsupported FSC would be printed and nothing else
would happen. With this patch, the code gets routed to the APEI
handling of SEAs in the host kernel to report the SEA information.

Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
 arch/arm/include/asm/system_misc.h   |  5 +++++
 arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
 arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
 arch/arm64/include/asm/system_misc.h |  2 ++
 arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
 drivers/acpi/apei/ghes.c             | 13 +++++++------
 include/acpi/ghes.h                  |  2 +-
 8 files changed, 87 insertions(+), 12 deletions(-)

diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
index a3f0b3d..ebf020b 100644
--- a/arch/arm/include/asm/kvm_arm.h
+++ b/arch/arm/include/asm/kvm_arm.h
@@ -187,6 +187,16 @@
 #define FSC_FAULT	(0x04)
 #define FSC_ACCESS	(0x08)
 #define FSC_PERM	(0x0c)
+#define FSC_SEA		(0x10)
+#define FSC_SEA_TTW0	(0x14)
+#define FSC_SEA_TTW1	(0x15)
+#define FSC_SEA_TTW2	(0x16)
+#define FSC_SEA_TTW3	(0x17)
+#define FSC_SECC	(0x18)
+#define FSC_SECC_TTW0	(0x1c)
+#define FSC_SECC_TTW1	(0x1d)
+#define FSC_SECC_TTW2	(0x1e)
+#define FSC_SECC_TTW3	(0x1f)
 
 /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
 #define HPFAR_MASK	(~0xf)
diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
index a3d61ad..8c4a89f 100644
--- a/arch/arm/include/asm/system_misc.h
+++ b/arch/arm/include/asm/system_misc.h
@@ -22,6 +22,11 @@
 
 extern unsigned int user_debug;
 
+static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
+{
+	return -1;
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_ARM_SYSTEM_MISC_H */
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 962616f..9a977c8 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -29,6 +29,7 @@
 #include <asm/kvm_asm.h>
 #include <asm/kvm_emulate.h>
 #include <asm/virt.h>
+#include <asm/system_misc.h>
 
 #include "trace.h"
 
@@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
 		kvm_set_pfn_accessed(pfn);
 }
 
+static bool is_abort_sea(unsigned long fault_status) {
+	switch (fault_status) {
+	case FSC_SEA:
+	case FSC_SEA_TTW0:
+	case FSC_SEA_TTW1:
+	case FSC_SEA_TTW2:
+	case FSC_SEA_TTW3:
+	case FSC_SECC:
+	case FSC_SECC_TTW0:
+	case FSC_SECC_TTW1:
+	case FSC_SECC_TTW2:
+	case FSC_SECC_TTW3:
+		return true;
+	default:
+		return false;
+	}
+}
+
 /**
  * kvm_handle_guest_abort - handles all 2nd stage aborts
  * @vcpu:	the VCPU pointer
@@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	gfn_t gfn;
 	int ret, idx;
 
+	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
+
+	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
+
+	/*
+	 * The host kernel will handle the synchronous external abort. There
+	 * is no need to pass the error into the guest.
+	 */
+	if (is_abort_sea(fault_status))
+		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
+			return 1;
+
 	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
 	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
 		kvm_inject_vabt(vcpu);
 		return 1;
 	}
 
-	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
-
 	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
 			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
 
 	/* Check the stage-2 fault is trans. fault or write fault */
-	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
 	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
 	    fault_status != FSC_ACCESS) {
 		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 6e99978..61d694c 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -204,6 +204,16 @@
 #define FSC_FAULT	ESR_ELx_FSC_FAULT
 #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
 #define FSC_PERM	ESR_ELx_FSC_PERM
+#define FSC_SEA		ESR_ELx_FSC_EXTABT
+#define FSC_SEA_TTW0	(0x14)
+#define FSC_SEA_TTW1	(0x15)
+#define FSC_SEA_TTW2	(0x16)
+#define FSC_SEA_TTW3	(0x17)
+#define FSC_SECC	(0x18)
+#define FSC_SECC_TTW0	(0x1c)
+#define FSC_SECC_TTW1	(0x1d)
+#define FSC_SECC_TTW2	(0x1e)
+#define FSC_SECC_TTW3	(0x1f)
 
 /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
 #define HPFAR_MASK	(~UL(0xf))
diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
index bc81243..95aa442 100644
--- a/arch/arm64/include/asm/system_misc.h
+++ b/arch/arm64/include/asm/system_misc.h
@@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
 	__show_ratelimited;						\
 })
 
+int handle_guest_sea(phys_addr_t addr, unsigned int esr);
+
 #endif	/* __ASSEMBLY__ */
 
 #endif	/* __ASM_SYSTEM_MISC_H */
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index f7372ce..3abb367 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 {
 	struct siginfo info;
+	int ret = 0;
 
 	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
 		 fault_name(esr), esr, addr);
@@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 	 */
 	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
 		nmi_enter();
-		ghes_notify_sea();
+		ret = ghes_notify_sea();
 		nmi_exit();
 	}
 
@@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 		info.si_addr  = (void __user *)addr;
 	arm64_notify_die("", regs, &info, esr);
 
-	return 0;
+	return ret;
 }
 
 static const struct fault_info {
@@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
 }
 
 /*
+ * Handle Synchronous External Aborts that occur in a guest kernel.
+ *
+ * The return value will be zero if the SEA was successfully handled
+ * and non-zero if there was an error processing the error or there was
+ * no error to process.
+ */
+int handle_guest_sea(phys_addr_t addr, unsigned int esr)
+{
+	int ret = -ENOENT;
+
+	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
+		ret = ghes_notify_sea();
+	}
+
+	return ret;
+}
+
+/*
  * Dispatch a data abort to the relevant handler.
  */
 asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 230b095..81eabc6 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
 #ifdef CONFIG_ACPI_APEI_SEA
 static LIST_HEAD(ghes_sea);
 
-void ghes_notify_sea(void)
+int ghes_notify_sea(void)
 {
 	struct ghes *ghes;
+	int ret = -ENOENT;
 
-	/*
-	 * synchronize_rcu() will wait for nmi_exit(), so no need to
-	 * rcu_read_lock().
-	 */
+	rcu_read_lock();
 	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
-		ghes_proc(ghes);
+		if(!ghes_proc(ghes))
+			ret = 0;
 	}
+	rcu_read_unlock();
+	return ret;
 }
 
 static void ghes_sea_add(struct ghes *ghes)
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 18bc935..2a727dc 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
 		gdata + 1;
 }
 
-void ghes_notify_sea(void);
+int ghes_notify_sea(void);
 
 #endif /* GHES_H */
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply related	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
  2017-03-28 19:30   ` Tyler Baicar
  (?)
@ 2017-03-28 20:26     ` Christoffer Dall
  -1 siblings, 0 replies; 80+ messages in thread
From: Christoffer Dall @ 2017-03-28 20:26 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: linux-efi, kvm, matt, catalin.marinas, will.deacon, robert.moore,
	paul.gortmaker, lv.zheng, kvmarm, fu.wei, zjzhang, linux,
	gengdongjiu, linux-acpi, eun.taik.lee, shijie.huang, labbott,
	lenb, harba, john.garry, marc.zyngier, punit.agrawal, rostedt,
	nkaje, sandeepa.s.prabhu, linux-arm-kernel, devel, rjw, rruigrok,
	linux-kernel, astone, hanjun.guo, joe, pbonzini, akpm, bristot,
	shiju.jose

On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
> Currently external aborts are unsupported by the guest abort
> handling. Add handling for SEAs so that the host kernel reports
> SEAs which occur in the guest kernel.
> 
> When an SEA occurs in the guest kernel, the guest exits and is
> routed to kvm_handle_guest_abort(). Prior to this patch, a print
> message of an unsupported FSC would be printed and nothing else
> would happen. With this patch, the code gets routed to the APEI
> handling of SEAs in the host kernel to report the SEA information.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
>  arch/arm/include/asm/system_misc.h   |  5 +++++
>  arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
>  arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
>  arch/arm64/include/asm/system_misc.h |  2 ++
>  arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
>  drivers/acpi/apei/ghes.c             | 13 +++++++------
>  include/acpi/ghes.h                  |  2 +-
>  8 files changed, 87 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
> index a3f0b3d..ebf020b 100644
> --- a/arch/arm/include/asm/kvm_arm.h
> +++ b/arch/arm/include/asm/kvm_arm.h
> @@ -187,6 +187,16 @@
>  #define FSC_FAULT	(0x04)
>  #define FSC_ACCESS	(0x08)
>  #define FSC_PERM	(0x0c)
> +#define FSC_SEA		(0x10)
> +#define FSC_SEA_TTW0	(0x14)
> +#define FSC_SEA_TTW1	(0x15)
> +#define FSC_SEA_TTW2	(0x16)
> +#define FSC_SEA_TTW3	(0x17)
> +#define FSC_SECC	(0x18)
> +#define FSC_SECC_TTW0	(0x1c)
> +#define FSC_SECC_TTW1	(0x1d)
> +#define FSC_SECC_TTW2	(0x1e)
> +#define FSC_SECC_TTW3	(0x1f)
>  
>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>  #define HPFAR_MASK	(~0xf)
> diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
> index a3d61ad..8c4a89f 100644
> --- a/arch/arm/include/asm/system_misc.h
> +++ b/arch/arm/include/asm/system_misc.h
> @@ -22,6 +22,11 @@
>  
>  extern unsigned int user_debug;
>  
> +static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +{
> +	return -1;
> +}
> +
>  #endif /* !__ASSEMBLY__ */
>  
>  #endif /* __ASM_ARM_SYSTEM_MISC_H */
> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> index 962616f..9a977c8 100644
> --- a/arch/arm/kvm/mmu.c
> +++ b/arch/arm/kvm/mmu.c
> @@ -29,6 +29,7 @@
>  #include <asm/kvm_asm.h>
>  #include <asm/kvm_emulate.h>
>  #include <asm/virt.h>
> +#include <asm/system_misc.h>
>  
>  #include "trace.h"
>  
> @@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
>  		kvm_set_pfn_accessed(pfn);
>  }
>  
> +static bool is_abort_sea(unsigned long fault_status) {
> +	switch (fault_status) {
> +	case FSC_SEA:
> +	case FSC_SEA_TTW0:
> +	case FSC_SEA_TTW1:
> +	case FSC_SEA_TTW2:
> +	case FSC_SEA_TTW3:
> +	case FSC_SECC:
> +	case FSC_SECC_TTW0:
> +	case FSC_SECC_TTW1:
> +	case FSC_SECC_TTW2:
> +	case FSC_SECC_TTW3:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
>  /**
>   * kvm_handle_guest_abort - handles all 2nd stage aborts
>   * @vcpu:	the VCPU pointer
> @@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
>  	gfn_t gfn;
>  	int ret, idx;
>  
> +	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> +
> +	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> +
> +	/*
> +	 * The host kernel will handle the synchronous external abort. There
> +	 * is no need to pass the error into the guest.
> +	 */
> +	if (is_abort_sea(fault_status))
> +		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
> +			return 1;
> +

So what's the logic in presenting this as a vabt to the guest when the
host couldn't handle it?  What do you do in other parts of the kernel if
you see an abort that the host cannot handle?

nit: I'd prefer to see braces around the the multi-line block above.


>  	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
>  	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
>  		kvm_inject_vabt(vcpu);
>  		return 1;
>  	}
>  
> -	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> -
>  	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
>  			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
>  
>  	/* Check the stage-2 fault is trans. fault or write fault */
> -	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>  	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
>  	    fault_status != FSC_ACCESS) {
>  		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> index 6e99978..61d694c 100644
> --- a/arch/arm64/include/asm/kvm_arm.h
> +++ b/arch/arm64/include/asm/kvm_arm.h
> @@ -204,6 +204,16 @@
>  #define FSC_FAULT	ESR_ELx_FSC_FAULT
>  #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
>  #define FSC_PERM	ESR_ELx_FSC_PERM
> +#define FSC_SEA		ESR_ELx_FSC_EXTABT
> +#define FSC_SEA_TTW0	(0x14)
> +#define FSC_SEA_TTW1	(0x15)
> +#define FSC_SEA_TTW2	(0x16)
> +#define FSC_SEA_TTW3	(0x17)
> +#define FSC_SECC	(0x18)
> +#define FSC_SECC_TTW0	(0x1c)
> +#define FSC_SECC_TTW1	(0x1d)
> +#define FSC_SECC_TTW2	(0x1e)
> +#define FSC_SECC_TTW3	(0x1f)
>  
>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>  #define HPFAR_MASK	(~UL(0xf))
> diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
> index bc81243..95aa442 100644
> --- a/arch/arm64/include/asm/system_misc.h
> +++ b/arch/arm64/include/asm/system_misc.h
> @@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
>  	__show_ratelimited;						\
>  })
>  
> +int handle_guest_sea(phys_addr_t addr, unsigned int esr);
> +
>  #endif	/* __ASSEMBLY__ */
>  
>  #endif	/* __ASM_SYSTEM_MISC_H */
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index f7372ce..3abb367 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  {
>  	struct siginfo info;
> +	int ret = 0;
>  
>  	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
>  		 fault_name(esr), esr, addr);
> @@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  	 */
>  	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
>  		nmi_enter();
> -		ghes_notify_sea();
> +		ret = ghes_notify_sea();
>  		nmi_exit();
>  	}
>  
> @@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  		info.si_addr  = (void __user *)addr;
>  	arm64_notify_die("", regs, &info, esr);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static const struct fault_info {
> @@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
>  }
>  
>  /*
> + * Handle Synchronous External Aborts that occur in a guest kernel.
> + *
> + * The return value will be zero if the SEA was successfully handled
> + * and non-zero if there was an error processing the error or there was
> + * no error to process.
> + */
> +int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +{
> +	int ret = -ENOENT;
> +
> +	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {

nit: missing white space

> +		ret = ghes_notify_sea();
> +	}
> +
> +	return ret;
> +}
> +
> +/*
>   * Dispatch a data abort to the relevant handler.
>   */
>  asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 230b095..81eabc6 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
>  #ifdef CONFIG_ACPI_APEI_SEA
>  static LIST_HEAD(ghes_sea);
>  
> -void ghes_notify_sea(void)
> +int ghes_notify_sea(void)
>  {
>  	struct ghes *ghes;
> +	int ret = -ENOENT;
>  
> -	/*
> -	 * synchronize_rcu() will wait for nmi_exit(), so no need to
> -	 * rcu_read_lock().
> -	 */
> +	rcu_read_lock();
>  	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
> -		ghes_proc(ghes);
> +		if(!ghes_proc(ghes))
> +			ret = 0;
>  	}
> +	rcu_read_unlock();
> +	return ret;
>  }
>  
>  static void ghes_sea_add(struct ghes *ghes)
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 18bc935..2a727dc 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
>  		gdata + 1;
>  }
>  
> -void ghes_notify_sea(void);
> +int ghes_notify_sea(void);
>  
>  #endif /* GHES_H */
> -- 

I feel like the changes to acpi/arm64 in this patch could have been a
separate patch or folded into previous patches, but for the KVM part of
this patch:

Acked-by: Christoffer Dall <cdall@linaro.org>

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
@ 2017-03-28 20:26     ` Christoffer Dall
  0 siblings, 0 replies; 80+ messages in thread
From: Christoffer Dall @ 2017-03-28 20:26 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
> Currently external aborts are unsupported by the guest abort
> handling. Add handling for SEAs so that the host kernel reports
> SEAs which occur in the guest kernel.
> 
> When an SEA occurs in the guest kernel, the guest exits and is
> routed to kvm_handle_guest_abort(). Prior to this patch, a print
> message of an unsupported FSC would be printed and nothing else
> would happen. With this patch, the code gets routed to the APEI
> handling of SEAs in the host kernel to report the SEA information.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
>  arch/arm/include/asm/system_misc.h   |  5 +++++
>  arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
>  arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
>  arch/arm64/include/asm/system_misc.h |  2 ++
>  arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
>  drivers/acpi/apei/ghes.c             | 13 +++++++------
>  include/acpi/ghes.h                  |  2 +-
>  8 files changed, 87 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
> index a3f0b3d..ebf020b 100644
> --- a/arch/arm/include/asm/kvm_arm.h
> +++ b/arch/arm/include/asm/kvm_arm.h
> @@ -187,6 +187,16 @@
>  #define FSC_FAULT	(0x04)
>  #define FSC_ACCESS	(0x08)
>  #define FSC_PERM	(0x0c)
> +#define FSC_SEA		(0x10)
> +#define FSC_SEA_TTW0	(0x14)
> +#define FSC_SEA_TTW1	(0x15)
> +#define FSC_SEA_TTW2	(0x16)
> +#define FSC_SEA_TTW3	(0x17)
> +#define FSC_SECC	(0x18)
> +#define FSC_SECC_TTW0	(0x1c)
> +#define FSC_SECC_TTW1	(0x1d)
> +#define FSC_SECC_TTW2	(0x1e)
> +#define FSC_SECC_TTW3	(0x1f)
>  
>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>  #define HPFAR_MASK	(~0xf)
> diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
> index a3d61ad..8c4a89f 100644
> --- a/arch/arm/include/asm/system_misc.h
> +++ b/arch/arm/include/asm/system_misc.h
> @@ -22,6 +22,11 @@
>  
>  extern unsigned int user_debug;
>  
> +static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +{
> +	return -1;
> +}
> +
>  #endif /* !__ASSEMBLY__ */
>  
>  #endif /* __ASM_ARM_SYSTEM_MISC_H */
> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> index 962616f..9a977c8 100644
> --- a/arch/arm/kvm/mmu.c
> +++ b/arch/arm/kvm/mmu.c
> @@ -29,6 +29,7 @@
>  #include <asm/kvm_asm.h>
>  #include <asm/kvm_emulate.h>
>  #include <asm/virt.h>
> +#include <asm/system_misc.h>
>  
>  #include "trace.h"
>  
> @@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
>  		kvm_set_pfn_accessed(pfn);
>  }
>  
> +static bool is_abort_sea(unsigned long fault_status) {
> +	switch (fault_status) {
> +	case FSC_SEA:
> +	case FSC_SEA_TTW0:
> +	case FSC_SEA_TTW1:
> +	case FSC_SEA_TTW2:
> +	case FSC_SEA_TTW3:
> +	case FSC_SECC:
> +	case FSC_SECC_TTW0:
> +	case FSC_SECC_TTW1:
> +	case FSC_SECC_TTW2:
> +	case FSC_SECC_TTW3:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
>  /**
>   * kvm_handle_guest_abort - handles all 2nd stage aborts
>   * @vcpu:	the VCPU pointer
> @@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
>  	gfn_t gfn;
>  	int ret, idx;
>  
> +	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> +
> +	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> +
> +	/*
> +	 * The host kernel will handle the synchronous external abort. There
> +	 * is no need to pass the error into the guest.
> +	 */
> +	if (is_abort_sea(fault_status))
> +		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
> +			return 1;
> +

So what's the logic in presenting this as a vabt to the guest when the
host couldn't handle it?  What do you do in other parts of the kernel if
you see an abort that the host cannot handle?

nit: I'd prefer to see braces around the the multi-line block above.


>  	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
>  	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
>  		kvm_inject_vabt(vcpu);
>  		return 1;
>  	}
>  
> -	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> -
>  	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
>  			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
>  
>  	/* Check the stage-2 fault is trans. fault or write fault */
> -	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>  	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
>  	    fault_status != FSC_ACCESS) {
>  		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> index 6e99978..61d694c 100644
> --- a/arch/arm64/include/asm/kvm_arm.h
> +++ b/arch/arm64/include/asm/kvm_arm.h
> @@ -204,6 +204,16 @@
>  #define FSC_FAULT	ESR_ELx_FSC_FAULT
>  #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
>  #define FSC_PERM	ESR_ELx_FSC_PERM
> +#define FSC_SEA		ESR_ELx_FSC_EXTABT
> +#define FSC_SEA_TTW0	(0x14)
> +#define FSC_SEA_TTW1	(0x15)
> +#define FSC_SEA_TTW2	(0x16)
> +#define FSC_SEA_TTW3	(0x17)
> +#define FSC_SECC	(0x18)
> +#define FSC_SECC_TTW0	(0x1c)
> +#define FSC_SECC_TTW1	(0x1d)
> +#define FSC_SECC_TTW2	(0x1e)
> +#define FSC_SECC_TTW3	(0x1f)
>  
>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>  #define HPFAR_MASK	(~UL(0xf))
> diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
> index bc81243..95aa442 100644
> --- a/arch/arm64/include/asm/system_misc.h
> +++ b/arch/arm64/include/asm/system_misc.h
> @@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
>  	__show_ratelimited;						\
>  })
>  
> +int handle_guest_sea(phys_addr_t addr, unsigned int esr);
> +
>  #endif	/* __ASSEMBLY__ */
>  
>  #endif	/* __ASM_SYSTEM_MISC_H */
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index f7372ce..3abb367 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  {
>  	struct siginfo info;
> +	int ret = 0;
>  
>  	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
>  		 fault_name(esr), esr, addr);
> @@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  	 */
>  	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
>  		nmi_enter();
> -		ghes_notify_sea();
> +		ret = ghes_notify_sea();
>  		nmi_exit();
>  	}
>  
> @@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  		info.si_addr  = (void __user *)addr;
>  	arm64_notify_die("", regs, &info, esr);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static const struct fault_info {
> @@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
>  }
>  
>  /*
> + * Handle Synchronous External Aborts that occur in a guest kernel.
> + *
> + * The return value will be zero if the SEA was successfully handled
> + * and non-zero if there was an error processing the error or there was
> + * no error to process.
> + */
> +int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +{
> +	int ret = -ENOENT;
> +
> +	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {

nit: missing white space

> +		ret = ghes_notify_sea();
> +	}
> +
> +	return ret;
> +}
> +
> +/*
>   * Dispatch a data abort to the relevant handler.
>   */
>  asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 230b095..81eabc6 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
>  #ifdef CONFIG_ACPI_APEI_SEA
>  static LIST_HEAD(ghes_sea);
>  
> -void ghes_notify_sea(void)
> +int ghes_notify_sea(void)
>  {
>  	struct ghes *ghes;
> +	int ret = -ENOENT;
>  
> -	/*
> -	 * synchronize_rcu() will wait for nmi_exit(), so no need to
> -	 * rcu_read_lock().
> -	 */
> +	rcu_read_lock();
>  	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
> -		ghes_proc(ghes);
> +		if(!ghes_proc(ghes))
> +			ret = 0;
>  	}
> +	rcu_read_unlock();
> +	return ret;
>  }
>  
>  static void ghes_sea_add(struct ghes *ghes)
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 18bc935..2a727dc 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
>  		gdata + 1;
>  }
>  
> -void ghes_notify_sea(void);
> +int ghes_notify_sea(void);
>  
>  #endif /* GHES_H */
> -- 

I feel like the changes to acpi/arm64 in this patch could have been a
separate patch or folded into previous patches, but for the KVM part of
this patch:

Acked-by: Christoffer Dall <cdall@linaro.org>

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
@ 2017-03-28 20:26     ` Christoffer Dall
  0 siblings, 0 replies; 80+ messages in thread
From: Christoffer Dall @ 2017-03-28 20:26 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
> Currently external aborts are unsupported by the guest abort
> handling. Add handling for SEAs so that the host kernel reports
> SEAs which occur in the guest kernel.
> 
> When an SEA occurs in the guest kernel, the guest exits and is
> routed to kvm_handle_guest_abort(). Prior to this patch, a print
> message of an unsupported FSC would be printed and nothing else
> would happen. With this patch, the code gets routed to the APEI
> handling of SEAs in the host kernel to report the SEA information.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
>  arch/arm/include/asm/system_misc.h   |  5 +++++
>  arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
>  arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
>  arch/arm64/include/asm/system_misc.h |  2 ++
>  arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
>  drivers/acpi/apei/ghes.c             | 13 +++++++------
>  include/acpi/ghes.h                  |  2 +-
>  8 files changed, 87 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
> index a3f0b3d..ebf020b 100644
> --- a/arch/arm/include/asm/kvm_arm.h
> +++ b/arch/arm/include/asm/kvm_arm.h
> @@ -187,6 +187,16 @@
>  #define FSC_FAULT	(0x04)
>  #define FSC_ACCESS	(0x08)
>  #define FSC_PERM	(0x0c)
> +#define FSC_SEA		(0x10)
> +#define FSC_SEA_TTW0	(0x14)
> +#define FSC_SEA_TTW1	(0x15)
> +#define FSC_SEA_TTW2	(0x16)
> +#define FSC_SEA_TTW3	(0x17)
> +#define FSC_SECC	(0x18)
> +#define FSC_SECC_TTW0	(0x1c)
> +#define FSC_SECC_TTW1	(0x1d)
> +#define FSC_SECC_TTW2	(0x1e)
> +#define FSC_SECC_TTW3	(0x1f)
>  
>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>  #define HPFAR_MASK	(~0xf)
> diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
> index a3d61ad..8c4a89f 100644
> --- a/arch/arm/include/asm/system_misc.h
> +++ b/arch/arm/include/asm/system_misc.h
> @@ -22,6 +22,11 @@
>  
>  extern unsigned int user_debug;
>  
> +static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +{
> +	return -1;
> +}
> +
>  #endif /* !__ASSEMBLY__ */
>  
>  #endif /* __ASM_ARM_SYSTEM_MISC_H */
> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> index 962616f..9a977c8 100644
> --- a/arch/arm/kvm/mmu.c
> +++ b/arch/arm/kvm/mmu.c
> @@ -29,6 +29,7 @@
>  #include <asm/kvm_asm.h>
>  #include <asm/kvm_emulate.h>
>  #include <asm/virt.h>
> +#include <asm/system_misc.h>
>  
>  #include "trace.h"
>  
> @@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
>  		kvm_set_pfn_accessed(pfn);
>  }
>  
> +static bool is_abort_sea(unsigned long fault_status) {
> +	switch (fault_status) {
> +	case FSC_SEA:
> +	case FSC_SEA_TTW0:
> +	case FSC_SEA_TTW1:
> +	case FSC_SEA_TTW2:
> +	case FSC_SEA_TTW3:
> +	case FSC_SECC:
> +	case FSC_SECC_TTW0:
> +	case FSC_SECC_TTW1:
> +	case FSC_SECC_TTW2:
> +	case FSC_SECC_TTW3:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
>  /**
>   * kvm_handle_guest_abort - handles all 2nd stage aborts
>   * @vcpu:	the VCPU pointer
> @@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
>  	gfn_t gfn;
>  	int ret, idx;
>  
> +	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> +
> +	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> +
> +	/*
> +	 * The host kernel will handle the synchronous external abort. There
> +	 * is no need to pass the error into the guest.
> +	 */
> +	if (is_abort_sea(fault_status))
> +		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
> +			return 1;
> +

So what's the logic in presenting this as a vabt to the guest when the
host couldn't handle it?  What do you do in other parts of the kernel if
you see an abort that the host cannot handle?

nit: I'd prefer to see braces around the the multi-line block above.


>  	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
>  	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
>  		kvm_inject_vabt(vcpu);
>  		return 1;
>  	}
>  
> -	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> -
>  	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
>  			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
>  
>  	/* Check the stage-2 fault is trans. fault or write fault */
> -	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>  	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
>  	    fault_status != FSC_ACCESS) {
>  		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> index 6e99978..61d694c 100644
> --- a/arch/arm64/include/asm/kvm_arm.h
> +++ b/arch/arm64/include/asm/kvm_arm.h
> @@ -204,6 +204,16 @@
>  #define FSC_FAULT	ESR_ELx_FSC_FAULT
>  #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
>  #define FSC_PERM	ESR_ELx_FSC_PERM
> +#define FSC_SEA		ESR_ELx_FSC_EXTABT
> +#define FSC_SEA_TTW0	(0x14)
> +#define FSC_SEA_TTW1	(0x15)
> +#define FSC_SEA_TTW2	(0x16)
> +#define FSC_SEA_TTW3	(0x17)
> +#define FSC_SECC	(0x18)
> +#define FSC_SECC_TTW0	(0x1c)
> +#define FSC_SECC_TTW1	(0x1d)
> +#define FSC_SECC_TTW2	(0x1e)
> +#define FSC_SECC_TTW3	(0x1f)
>  
>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>  #define HPFAR_MASK	(~UL(0xf))
> diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
> index bc81243..95aa442 100644
> --- a/arch/arm64/include/asm/system_misc.h
> +++ b/arch/arm64/include/asm/system_misc.h
> @@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
>  	__show_ratelimited;						\
>  })
>  
> +int handle_guest_sea(phys_addr_t addr, unsigned int esr);
> +
>  #endif	/* __ASSEMBLY__ */
>  
>  #endif	/* __ASM_SYSTEM_MISC_H */
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index f7372ce..3abb367 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  {
>  	struct siginfo info;
> +	int ret = 0;
>  
>  	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
>  		 fault_name(esr), esr, addr);
> @@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  	 */
>  	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
>  		nmi_enter();
> -		ghes_notify_sea();
> +		ret = ghes_notify_sea();
>  		nmi_exit();
>  	}
>  
> @@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>  		info.si_addr  = (void __user *)addr;
>  	arm64_notify_die("", regs, &info, esr);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static const struct fault_info {
> @@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
>  }
>  
>  /*
> + * Handle Synchronous External Aborts that occur in a guest kernel.
> + *
> + * The return value will be zero if the SEA was successfully handled
> + * and non-zero if there was an error processing the error or there was
> + * no error to process.
> + */
> +int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +{
> +	int ret = -ENOENT;
> +
> +	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {

nit: missing white space

> +		ret = ghes_notify_sea();
> +	}
> +
> +	return ret;
> +}
> +
> +/*
>   * Dispatch a data abort to the relevant handler.
>   */
>  asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 230b095..81eabc6 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
>  #ifdef CONFIG_ACPI_APEI_SEA
>  static LIST_HEAD(ghes_sea);
>  
> -void ghes_notify_sea(void)
> +int ghes_notify_sea(void)
>  {
>  	struct ghes *ghes;
> +	int ret = -ENOENT;
>  
> -	/*
> -	 * synchronize_rcu() will wait for nmi_exit(), so no need to
> -	 * rcu_read_lock().
> -	 */
> +	rcu_read_lock();
>  	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
> -		ghes_proc(ghes);
> +		if(!ghes_proc(ghes))
> +			ret = 0;
>  	}
> +	rcu_read_unlock();
> +	return ret;
>  }
>  
>  static void ghes_sea_add(struct ghes *ghes)
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 18bc935..2a727dc 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
>  		gdata + 1;
>  }
>  
> -void ghes_notify_sea(void);
> +int ghes_notify_sea(void);
>  
>  #endif /* GHES_H */
> -- 

I feel like the changes to acpi/arm64 in this patch could have been a
separate patch or folded into previous patches, but for the KVM part of
this patch:

Acked-by: Christoffer Dall <cdall@linaro.org>

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
  2017-03-28 20:26     ` Christoffer Dall
  (?)
@ 2017-03-28 21:33       ` Baicar, Tyler
  -1 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-03-28 21:33 UTC (permalink / raw)
  To: Christoffer Dall
  Cc: linux-efi, kvm, matt, catalin.marinas, will.deacon, robert.moore,
	paul.gortmaker, lv.zheng, kvmarm, fu.wei, zjzhang, linux,
	gengdongjiu, linux-acpi, eun.taik.lee, shijie.huang, labbott,
	lenb, harba, john.garry, marc.zyngier, punit.agrawal, rostedt,
	nkaje, sandeepa.s.prabhu, linux-arm-kernel, devel, rjw, rruigrok,
	linux-kernel, astone, hanjun.guo, joe, pbonzini, akpm, bristot,
	shiju.jose

Hello Christoffer,


On 3/28/2017 2:26 PM, Christoffer Dall wrote:
> On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
>> Currently external aborts are unsupported by the guest abort
>> handling. Add handling for SEAs so that the host kernel reports
>> SEAs which occur in the guest kernel.
>>
>> When an SEA occurs in the guest kernel, the guest exits and is
>> routed to kvm_handle_guest_abort(). Prior to this patch, a print
>> message of an unsupported FSC would be printed and nothing else
>> would happen. With this patch, the code gets routed to the APEI
>> handling of SEAs in the host kernel to report the SEA information.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
>> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
>> ---
>>   arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
>>   arch/arm/include/asm/system_misc.h   |  5 +++++
>>   arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
>>   arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
>>   arch/arm64/include/asm/system_misc.h |  2 ++
>>   arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
>>   drivers/acpi/apei/ghes.c             | 13 +++++++------
>>   include/acpi/ghes.h                  |  2 +-
>>   8 files changed, 87 insertions(+), 12 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
>> index a3f0b3d..ebf020b 100644
>> --- a/arch/arm/include/asm/kvm_arm.h
>> +++ b/arch/arm/include/asm/kvm_arm.h
>> @@ -187,6 +187,16 @@
>>   #define FSC_FAULT	(0x04)
>>   #define FSC_ACCESS	(0x08)
>>   #define FSC_PERM	(0x0c)
>> +#define FSC_SEA		(0x10)
>> +#define FSC_SEA_TTW0	(0x14)
>> +#define FSC_SEA_TTW1	(0x15)
>> +#define FSC_SEA_TTW2	(0x16)
>> +#define FSC_SEA_TTW3	(0x17)
>> +#define FSC_SECC	(0x18)
>> +#define FSC_SECC_TTW0	(0x1c)
>> +#define FSC_SECC_TTW1	(0x1d)
>> +#define FSC_SECC_TTW2	(0x1e)
>> +#define FSC_SECC_TTW3	(0x1f)
>>   
>>   /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>>   #define HPFAR_MASK	(~0xf)
>> diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
>> index a3d61ad..8c4a89f 100644
>> --- a/arch/arm/include/asm/system_misc.h
>> +++ b/arch/arm/include/asm/system_misc.h
>> @@ -22,6 +22,11 @@
>>   
>>   extern unsigned int user_debug;
>>   
>> +static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
>> +{
>> +	return -1;
>> +}
>> +
>>   #endif /* !__ASSEMBLY__ */
>>   
>>   #endif /* __ASM_ARM_SYSTEM_MISC_H */
>> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
>> index 962616f..9a977c8 100644
>> --- a/arch/arm/kvm/mmu.c
>> +++ b/arch/arm/kvm/mmu.c
>> @@ -29,6 +29,7 @@
>>   #include <asm/kvm_asm.h>
>>   #include <asm/kvm_emulate.h>
>>   #include <asm/virt.h>
>> +#include <asm/system_misc.h>
>>   
>>   #include "trace.h"
>>   
>> @@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
>>   		kvm_set_pfn_accessed(pfn);
>>   }
>>   
>> +static bool is_abort_sea(unsigned long fault_status) {
>> +	switch (fault_status) {
>> +	case FSC_SEA:
>> +	case FSC_SEA_TTW0:
>> +	case FSC_SEA_TTW1:
>> +	case FSC_SEA_TTW2:
>> +	case FSC_SEA_TTW3:
>> +	case FSC_SECC:
>> +	case FSC_SECC_TTW0:
>> +	case FSC_SECC_TTW1:
>> +	case FSC_SECC_TTW2:
>> +	case FSC_SECC_TTW3:
>> +		return true;
>> +	default:
>> +		return false;
>> +	}
>> +}
>> +
>>   /**
>>    * kvm_handle_guest_abort - handles all 2nd stage aborts
>>    * @vcpu:	the VCPU pointer
>> @@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
>>   	gfn_t gfn;
>>   	int ret, idx;
>>   
>> +	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>> +
>> +	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
>> +
>> +	/*
>> +	 * The host kernel will handle the synchronous external abort. There
>> +	 * is no need to pass the error into the guest.
>> +	 */
>> +	if (is_abort_sea(fault_status))
>> +		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
>> +			return 1;
>> +
> So what's the logic in presenting this as a vabt to the guest when the
> host couldn't handle it?  What do you do in other parts of the kernel if
> you see an abort that the host cannot handle?
The only cases that handle_guest_sea() will not return zero are there is 
no error to process
(firmware support isn't there) or the error populated is invalid. If 
there is no error to process,
we want to continue here with the handling that exists. If the error is 
invalid then GHES will
report that and since the error wasn't handled properly we should 
continue with existing
handling.

If there is an abort that GHES fails to handle in the host then GHES 
just reports that and we
also continue with the abort handling.
>
> nit: I'd prefer to see braces around the the multi-line block above.
I will add braces.
>
>
>>   	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
>>   	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
>>   		kvm_inject_vabt(vcpu);
>>   		return 1;
>>   	}
>>   
>> -	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
>> -
>>   	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
>>   			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
>>   
>>   	/* Check the stage-2 fault is trans. fault or write fault */
>> -	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>>   	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
>>   	    fault_status != FSC_ACCESS) {
>>   		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
>> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
>> index 6e99978..61d694c 100644
>> --- a/arch/arm64/include/asm/kvm_arm.h
>> +++ b/arch/arm64/include/asm/kvm_arm.h
>> @@ -204,6 +204,16 @@
>>   #define FSC_FAULT	ESR_ELx_FSC_FAULT
>>   #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
>>   #define FSC_PERM	ESR_ELx_FSC_PERM
>> +#define FSC_SEA		ESR_ELx_FSC_EXTABT
>> +#define FSC_SEA_TTW0	(0x14)
>> +#define FSC_SEA_TTW1	(0x15)
>> +#define FSC_SEA_TTW2	(0x16)
>> +#define FSC_SEA_TTW3	(0x17)
>> +#define FSC_SECC	(0x18)
>> +#define FSC_SECC_TTW0	(0x1c)
>> +#define FSC_SECC_TTW1	(0x1d)
>> +#define FSC_SECC_TTW2	(0x1e)
>> +#define FSC_SECC_TTW3	(0x1f)
>>   
>>   /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>>   #define HPFAR_MASK	(~UL(0xf))
>> diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
>> index bc81243..95aa442 100644
>> --- a/arch/arm64/include/asm/system_misc.h
>> +++ b/arch/arm64/include/asm/system_misc.h
>> @@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
>>   	__show_ratelimited;						\
>>   })
>>   
>> +int handle_guest_sea(phys_addr_t addr, unsigned int esr);
>> +
>>   #endif	/* __ASSEMBLY__ */
>>   
>>   #endif	/* __ASM_SYSTEM_MISC_H */
>> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
>> index f7372ce..3abb367 100644
>> --- a/arch/arm64/mm/fault.c
>> +++ b/arch/arm64/mm/fault.c
>> @@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   {
>>   	struct siginfo info;
>> +	int ret = 0;
>>   
>>   	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
>>   		 fault_name(esr), esr, addr);
>> @@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   	 */
>>   	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
>>   		nmi_enter();
>> -		ghes_notify_sea();
>> +		ret = ghes_notify_sea();
>>   		nmi_exit();
>>   	}
>>   
>> @@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   		info.si_addr  = (void __user *)addr;
>>   	arm64_notify_die("", regs, &info, esr);
>>   
>> -	return 0;
>> +	return ret;
>>   }
>>   
>>   static const struct fault_info {
>> @@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
>>   }
>>   
>>   /*
>> + * Handle Synchronous External Aborts that occur in a guest kernel.
>> + *
>> + * The return value will be zero if the SEA was successfully handled
>> + * and non-zero if there was an error processing the error or there was
>> + * no error to process.
>> + */
>> +int handle_guest_sea(phys_addr_t addr, unsigned int esr)
>> +{
>> +	int ret = -ENOENT;
>> +
>> +	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> nit: missing white space
I will add the space.
>
>> +		ret = ghes_notify_sea();
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +/*
>>    * Dispatch a data abort to the relevant handler.
>>    */
>>   asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index 230b095..81eabc6 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
>>   #ifdef CONFIG_ACPI_APEI_SEA
>>   static LIST_HEAD(ghes_sea);
>>   
>> -void ghes_notify_sea(void)
>> +int ghes_notify_sea(void)
>>   {
>>   	struct ghes *ghes;
>> +	int ret = -ENOENT;
>>   
>> -	/*
>> -	 * synchronize_rcu() will wait for nmi_exit(), so no need to
>> -	 * rcu_read_lock().
>> -	 */
>> +	rcu_read_lock();
>>   	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
>> -		ghes_proc(ghes);
>> +		if(!ghes_proc(ghes))
>> +			ret = 0;
>>   	}
>> +	rcu_read_unlock();
>> +	return ret;
>>   }
>>   
>>   static void ghes_sea_add(struct ghes *ghes)
>> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
>> index 18bc935..2a727dc 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
>>   		gdata + 1;
>>   }
>>   
>> -void ghes_notify_sea(void);
>> +int ghes_notify_sea(void);
>>   
>>   #endif /* GHES_H */
>> -- 
> I feel like the changes to acpi/arm64 in this patch could have been a
> separate patch or folded into previous patches, but for the KVM part of
> this patch:
>
> Acked-by: Christoffer Dall <cdall@linaro.org>
Thank you. I can break out the GHES changes if that is really desired.

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
@ 2017-03-28 21:33       ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-03-28 21:33 UTC (permalink / raw)
  To: Christoffer Dall
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

Hello Christoffer,


On 3/28/2017 2:26 PM, Christoffer Dall wrote:
> On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
>> Currently external aborts are unsupported by the guest abort
>> handling. Add handling for SEAs so that the host kernel reports
>> SEAs which occur in the guest kernel.
>>
>> When an SEA occurs in the guest kernel, the guest exits and is
>> routed to kvm_handle_guest_abort(). Prior to this patch, a print
>> message of an unsupported FSC would be printed and nothing else
>> would happen. With this patch, the code gets routed to the APEI
>> handling of SEAs in the host kernel to report the SEA information.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
>> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
>> ---
>>   arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
>>   arch/arm/include/asm/system_misc.h   |  5 +++++
>>   arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
>>   arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
>>   arch/arm64/include/asm/system_misc.h |  2 ++
>>   arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
>>   drivers/acpi/apei/ghes.c             | 13 +++++++------
>>   include/acpi/ghes.h                  |  2 +-
>>   8 files changed, 87 insertions(+), 12 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
>> index a3f0b3d..ebf020b 100644
>> --- a/arch/arm/include/asm/kvm_arm.h
>> +++ b/arch/arm/include/asm/kvm_arm.h
>> @@ -187,6 +187,16 @@
>>   #define FSC_FAULT	(0x04)
>>   #define FSC_ACCESS	(0x08)
>>   #define FSC_PERM	(0x0c)
>> +#define FSC_SEA		(0x10)
>> +#define FSC_SEA_TTW0	(0x14)
>> +#define FSC_SEA_TTW1	(0x15)
>> +#define FSC_SEA_TTW2	(0x16)
>> +#define FSC_SEA_TTW3	(0x17)
>> +#define FSC_SECC	(0x18)
>> +#define FSC_SECC_TTW0	(0x1c)
>> +#define FSC_SECC_TTW1	(0x1d)
>> +#define FSC_SECC_TTW2	(0x1e)
>> +#define FSC_SECC_TTW3	(0x1f)
>>   
>>   /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>>   #define HPFAR_MASK	(~0xf)
>> diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
>> index a3d61ad..8c4a89f 100644
>> --- a/arch/arm/include/asm/system_misc.h
>> +++ b/arch/arm/include/asm/system_misc.h
>> @@ -22,6 +22,11 @@
>>   
>>   extern unsigned int user_debug;
>>   
>> +static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
>> +{
>> +	return -1;
>> +}
>> +
>>   #endif /* !__ASSEMBLY__ */
>>   
>>   #endif /* __ASM_ARM_SYSTEM_MISC_H */
>> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
>> index 962616f..9a977c8 100644
>> --- a/arch/arm/kvm/mmu.c
>> +++ b/arch/arm/kvm/mmu.c
>> @@ -29,6 +29,7 @@
>>   #include <asm/kvm_asm.h>
>>   #include <asm/kvm_emulate.h>
>>   #include <asm/virt.h>
>> +#include <asm/system_misc.h>
>>   
>>   #include "trace.h"
>>   
>> @@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
>>   		kvm_set_pfn_accessed(pfn);
>>   }
>>   
>> +static bool is_abort_sea(unsigned long fault_status) {
>> +	switch (fault_status) {
>> +	case FSC_SEA:
>> +	case FSC_SEA_TTW0:
>> +	case FSC_SEA_TTW1:
>> +	case FSC_SEA_TTW2:
>> +	case FSC_SEA_TTW3:
>> +	case FSC_SECC:
>> +	case FSC_SECC_TTW0:
>> +	case FSC_SECC_TTW1:
>> +	case FSC_SECC_TTW2:
>> +	case FSC_SECC_TTW3:
>> +		return true;
>> +	default:
>> +		return false;
>> +	}
>> +}
>> +
>>   /**
>>    * kvm_handle_guest_abort - handles all 2nd stage aborts
>>    * @vcpu:	the VCPU pointer
>> @@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
>>   	gfn_t gfn;
>>   	int ret, idx;
>>   
>> +	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>> +
>> +	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
>> +
>> +	/*
>> +	 * The host kernel will handle the synchronous external abort. There
>> +	 * is no need to pass the error into the guest.
>> +	 */
>> +	if (is_abort_sea(fault_status))
>> +		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
>> +			return 1;
>> +
> So what's the logic in presenting this as a vabt to the guest when the
> host couldn't handle it?  What do you do in other parts of the kernel if
> you see an abort that the host cannot handle?
The only cases that handle_guest_sea() will not return zero are there is 
no error to process
(firmware support isn't there) or the error populated is invalid. If 
there is no error to process,
we want to continue here with the handling that exists. If the error is 
invalid then GHES will
report that and since the error wasn't handled properly we should 
continue with existing
handling.

If there is an abort that GHES fails to handle in the host then GHES 
just reports that and we
also continue with the abort handling.
>
> nit: I'd prefer to see braces around the the multi-line block above.
I will add braces.
>
>
>>   	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
>>   	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
>>   		kvm_inject_vabt(vcpu);
>>   		return 1;
>>   	}
>>   
>> -	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
>> -
>>   	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
>>   			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
>>   
>>   	/* Check the stage-2 fault is trans. fault or write fault */
>> -	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>>   	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
>>   	    fault_status != FSC_ACCESS) {
>>   		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
>> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
>> index 6e99978..61d694c 100644
>> --- a/arch/arm64/include/asm/kvm_arm.h
>> +++ b/arch/arm64/include/asm/kvm_arm.h
>> @@ -204,6 +204,16 @@
>>   #define FSC_FAULT	ESR_ELx_FSC_FAULT
>>   #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
>>   #define FSC_PERM	ESR_ELx_FSC_PERM
>> +#define FSC_SEA		ESR_ELx_FSC_EXTABT
>> +#define FSC_SEA_TTW0	(0x14)
>> +#define FSC_SEA_TTW1	(0x15)
>> +#define FSC_SEA_TTW2	(0x16)
>> +#define FSC_SEA_TTW3	(0x17)
>> +#define FSC_SECC	(0x18)
>> +#define FSC_SECC_TTW0	(0x1c)
>> +#define FSC_SECC_TTW1	(0x1d)
>> +#define FSC_SECC_TTW2	(0x1e)
>> +#define FSC_SECC_TTW3	(0x1f)
>>   
>>   /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>>   #define HPFAR_MASK	(~UL(0xf))
>> diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
>> index bc81243..95aa442 100644
>> --- a/arch/arm64/include/asm/system_misc.h
>> +++ b/arch/arm64/include/asm/system_misc.h
>> @@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
>>   	__show_ratelimited;						\
>>   })
>>   
>> +int handle_guest_sea(phys_addr_t addr, unsigned int esr);
>> +
>>   #endif	/* __ASSEMBLY__ */
>>   
>>   #endif	/* __ASM_SYSTEM_MISC_H */
>> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
>> index f7372ce..3abb367 100644
>> --- a/arch/arm64/mm/fault.c
>> +++ b/arch/arm64/mm/fault.c
>> @@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   {
>>   	struct siginfo info;
>> +	int ret = 0;
>>   
>>   	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
>>   		 fault_name(esr), esr, addr);
>> @@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   	 */
>>   	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
>>   		nmi_enter();
>> -		ghes_notify_sea();
>> +		ret = ghes_notify_sea();
>>   		nmi_exit();
>>   	}
>>   
>> @@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   		info.si_addr  = (void __user *)addr;
>>   	arm64_notify_die("", regs, &info, esr);
>>   
>> -	return 0;
>> +	return ret;
>>   }
>>   
>>   static const struct fault_info {
>> @@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
>>   }
>>   
>>   /*
>> + * Handle Synchronous External Aborts that occur in a guest kernel.
>> + *
>> + * The return value will be zero if the SEA was successfully handled
>> + * and non-zero if there was an error processing the error or there was
>> + * no error to process.
>> + */
>> +int handle_guest_sea(phys_addr_t addr, unsigned int esr)
>> +{
>> +	int ret = -ENOENT;
>> +
>> +	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> nit: missing white space
I will add the space.
>
>> +		ret = ghes_notify_sea();
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +/*
>>    * Dispatch a data abort to the relevant handler.
>>    */
>>   asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index 230b095..81eabc6 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
>>   #ifdef CONFIG_ACPI_APEI_SEA
>>   static LIST_HEAD(ghes_sea);
>>   
>> -void ghes_notify_sea(void)
>> +int ghes_notify_sea(void)
>>   {
>>   	struct ghes *ghes;
>> +	int ret = -ENOENT;
>>   
>> -	/*
>> -	 * synchronize_rcu() will wait for nmi_exit(), so no need to
>> -	 * rcu_read_lock().
>> -	 */
>> +	rcu_read_lock();
>>   	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
>> -		ghes_proc(ghes);
>> +		if(!ghes_proc(ghes))
>> +			ret = 0;
>>   	}
>> +	rcu_read_unlock();
>> +	return ret;
>>   }
>>   
>>   static void ghes_sea_add(struct ghes *ghes)
>> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
>> index 18bc935..2a727dc 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
>>   		gdata + 1;
>>   }
>>   
>> -void ghes_notify_sea(void);
>> +int ghes_notify_sea(void);
>>   
>>   #endif /* GHES_H */
>> -- 
> I feel like the changes to acpi/arm64 in this patch could have been a
> separate patch or folded into previous patches, but for the KVM part of
> this patch:
>
> Acked-by: Christoffer Dall <cdall@linaro.org>
Thank you. I can break out the GHES changes if that is really desired.

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
@ 2017-03-28 21:33       ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-03-28 21:33 UTC (permalink / raw)
  To: linux-arm-kernel

Hello Christoffer,


On 3/28/2017 2:26 PM, Christoffer Dall wrote:
> On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
>> Currently external aborts are unsupported by the guest abort
>> handling. Add handling for SEAs so that the host kernel reports
>> SEAs which occur in the guest kernel.
>>
>> When an SEA occurs in the guest kernel, the guest exits and is
>> routed to kvm_handle_guest_abort(). Prior to this patch, a print
>> message of an unsupported FSC would be printed and nothing else
>> would happen. With this patch, the code gets routed to the APEI
>> handling of SEAs in the host kernel to report the SEA information.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
>> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
>> ---
>>   arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
>>   arch/arm/include/asm/system_misc.h   |  5 +++++
>>   arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
>>   arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
>>   arch/arm64/include/asm/system_misc.h |  2 ++
>>   arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
>>   drivers/acpi/apei/ghes.c             | 13 +++++++------
>>   include/acpi/ghes.h                  |  2 +-
>>   8 files changed, 87 insertions(+), 12 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
>> index a3f0b3d..ebf020b 100644
>> --- a/arch/arm/include/asm/kvm_arm.h
>> +++ b/arch/arm/include/asm/kvm_arm.h
>> @@ -187,6 +187,16 @@
>>   #define FSC_FAULT	(0x04)
>>   #define FSC_ACCESS	(0x08)
>>   #define FSC_PERM	(0x0c)
>> +#define FSC_SEA		(0x10)
>> +#define FSC_SEA_TTW0	(0x14)
>> +#define FSC_SEA_TTW1	(0x15)
>> +#define FSC_SEA_TTW2	(0x16)
>> +#define FSC_SEA_TTW3	(0x17)
>> +#define FSC_SECC	(0x18)
>> +#define FSC_SECC_TTW0	(0x1c)
>> +#define FSC_SECC_TTW1	(0x1d)
>> +#define FSC_SECC_TTW2	(0x1e)
>> +#define FSC_SECC_TTW3	(0x1f)
>>   
>>   /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>>   #define HPFAR_MASK	(~0xf)
>> diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
>> index a3d61ad..8c4a89f 100644
>> --- a/arch/arm/include/asm/system_misc.h
>> +++ b/arch/arm/include/asm/system_misc.h
>> @@ -22,6 +22,11 @@
>>   
>>   extern unsigned int user_debug;
>>   
>> +static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
>> +{
>> +	return -1;
>> +}
>> +
>>   #endif /* !__ASSEMBLY__ */
>>   
>>   #endif /* __ASM_ARM_SYSTEM_MISC_H */
>> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
>> index 962616f..9a977c8 100644
>> --- a/arch/arm/kvm/mmu.c
>> +++ b/arch/arm/kvm/mmu.c
>> @@ -29,6 +29,7 @@
>>   #include <asm/kvm_asm.h>
>>   #include <asm/kvm_emulate.h>
>>   #include <asm/virt.h>
>> +#include <asm/system_misc.h>
>>   
>>   #include "trace.h"
>>   
>> @@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
>>   		kvm_set_pfn_accessed(pfn);
>>   }
>>   
>> +static bool is_abort_sea(unsigned long fault_status) {
>> +	switch (fault_status) {
>> +	case FSC_SEA:
>> +	case FSC_SEA_TTW0:
>> +	case FSC_SEA_TTW1:
>> +	case FSC_SEA_TTW2:
>> +	case FSC_SEA_TTW3:
>> +	case FSC_SECC:
>> +	case FSC_SECC_TTW0:
>> +	case FSC_SECC_TTW1:
>> +	case FSC_SECC_TTW2:
>> +	case FSC_SECC_TTW3:
>> +		return true;
>> +	default:
>> +		return false;
>> +	}
>> +}
>> +
>>   /**
>>    * kvm_handle_guest_abort - handles all 2nd stage aborts
>>    * @vcpu:	the VCPU pointer
>> @@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
>>   	gfn_t gfn;
>>   	int ret, idx;
>>   
>> +	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>> +
>> +	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
>> +
>> +	/*
>> +	 * The host kernel will handle the synchronous external abort. There
>> +	 * is no need to pass the error into the guest.
>> +	 */
>> +	if (is_abort_sea(fault_status))
>> +		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
>> +			return 1;
>> +
> So what's the logic in presenting this as a vabt to the guest when the
> host couldn't handle it?  What do you do in other parts of the kernel if
> you see an abort that the host cannot handle?
The only cases that handle_guest_sea() will not return zero are there is 
no error to process
(firmware support isn't there) or the error populated is invalid. If 
there is no error to process,
we want to continue here with the handling that exists. If the error is 
invalid then GHES will
report that and since the error wasn't handled properly we should 
continue with existing
handling.

If there is an abort that GHES fails to handle in the host then GHES 
just reports that and we
also continue with the abort handling.
>
> nit: I'd prefer to see braces around the the multi-line block above.
I will add braces.
>
>
>>   	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
>>   	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
>>   		kvm_inject_vabt(vcpu);
>>   		return 1;
>>   	}
>>   
>> -	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
>> -
>>   	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
>>   			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
>>   
>>   	/* Check the stage-2 fault is trans. fault or write fault */
>> -	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>>   	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
>>   	    fault_status != FSC_ACCESS) {
>>   		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
>> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
>> index 6e99978..61d694c 100644
>> --- a/arch/arm64/include/asm/kvm_arm.h
>> +++ b/arch/arm64/include/asm/kvm_arm.h
>> @@ -204,6 +204,16 @@
>>   #define FSC_FAULT	ESR_ELx_FSC_FAULT
>>   #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
>>   #define FSC_PERM	ESR_ELx_FSC_PERM
>> +#define FSC_SEA		ESR_ELx_FSC_EXTABT
>> +#define FSC_SEA_TTW0	(0x14)
>> +#define FSC_SEA_TTW1	(0x15)
>> +#define FSC_SEA_TTW2	(0x16)
>> +#define FSC_SEA_TTW3	(0x17)
>> +#define FSC_SECC	(0x18)
>> +#define FSC_SECC_TTW0	(0x1c)
>> +#define FSC_SECC_TTW1	(0x1d)
>> +#define FSC_SECC_TTW2	(0x1e)
>> +#define FSC_SECC_TTW3	(0x1f)
>>   
>>   /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
>>   #define HPFAR_MASK	(~UL(0xf))
>> diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
>> index bc81243..95aa442 100644
>> --- a/arch/arm64/include/asm/system_misc.h
>> +++ b/arch/arm64/include/asm/system_misc.h
>> @@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
>>   	__show_ratelimited;						\
>>   })
>>   
>> +int handle_guest_sea(phys_addr_t addr, unsigned int esr);
>> +
>>   #endif	/* __ASSEMBLY__ */
>>   
>>   #endif	/* __ASM_SYSTEM_MISC_H */
>> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
>> index f7372ce..3abb367 100644
>> --- a/arch/arm64/mm/fault.c
>> +++ b/arch/arm64/mm/fault.c
>> @@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   {
>>   	struct siginfo info;
>> +	int ret = 0;
>>   
>>   	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
>>   		 fault_name(esr), esr, addr);
>> @@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   	 */
>>   	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
>>   		nmi_enter();
>> -		ghes_notify_sea();
>> +		ret = ghes_notify_sea();
>>   		nmi_exit();
>>   	}
>>   
>> @@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>   		info.si_addr  = (void __user *)addr;
>>   	arm64_notify_die("", regs, &info, esr);
>>   
>> -	return 0;
>> +	return ret;
>>   }
>>   
>>   static const struct fault_info {
>> @@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
>>   }
>>   
>>   /*
>> + * Handle Synchronous External Aborts that occur in a guest kernel.
>> + *
>> + * The return value will be zero if the SEA was successfully handled
>> + * and non-zero if there was an error processing the error or there was
>> + * no error to process.
>> + */
>> +int handle_guest_sea(phys_addr_t addr, unsigned int esr)
>> +{
>> +	int ret = -ENOENT;
>> +
>> +	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> nit: missing white space
I will add the space.
>
>> +		ret = ghes_notify_sea();
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +/*
>>    * Dispatch a data abort to the relevant handler.
>>    */
>>   asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index 230b095..81eabc6 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
>>   #ifdef CONFIG_ACPI_APEI_SEA
>>   static LIST_HEAD(ghes_sea);
>>   
>> -void ghes_notify_sea(void)
>> +int ghes_notify_sea(void)
>>   {
>>   	struct ghes *ghes;
>> +	int ret = -ENOENT;
>>   
>> -	/*
>> -	 * synchronize_rcu() will wait for nmi_exit(), so no need to
>> -	 * rcu_read_lock().
>> -	 */
>> +	rcu_read_lock();
>>   	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
>> -		ghes_proc(ghes);
>> +		if(!ghes_proc(ghes))
>> +			ret = 0;
>>   	}
>> +	rcu_read_unlock();
>> +	return ret;
>>   }
>>   
>>   static void ghes_sea_add(struct ghes *ghes)
>> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
>> index 18bc935..2a727dc 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
>>   		gdata + 1;
>>   }
>>   
>> -void ghes_notify_sea(void);
>> +int ghes_notify_sea(void);
>>   
>>   #endif /* GHES_H */
>> -- 
> I feel like the changes to acpi/arm64 in this patch could have been a
> separate patch or folded into previous patches, but for the KVM part of
> this patch:
>
> Acked-by: Christoffer Dall <cdall@linaro.org>
Thank you. I can break out the GHES changes if that is really desired.

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
  2017-03-28 21:33       ` Baicar, Tyler
  (?)
@ 2017-03-28 22:18         ` Christoffer Dall
  -1 siblings, 0 replies; 80+ messages in thread
From: Christoffer Dall @ 2017-03-28 22:18 UTC (permalink / raw)
  To: Baicar, Tyler
  Cc: linux-efi, kvm, matt, catalin.marinas, will.deacon, robert.moore,
	paul.gortmaker, lv.zheng, kvmarm, fu.wei, zjzhang, linux,
	gengdongjiu, linux-acpi, eun.taik.lee, shijie.huang, labbott,
	lenb, harba, john.garry, marc.zyngier, punit.agrawal, rostedt,
	nkaje, sandeepa.s.prabhu, linux-arm-kernel, devel, rjw, rruigrok,
	linux-kernel, astone, hanjun.guo, joe, pbonzini, akpm, bristot,
	shiju.jose

On Tue, Mar 28, 2017 at 03:33:17PM -0600, Baicar, Tyler wrote:
> Hello Christoffer,
> 
> 
> On 3/28/2017 2:26 PM, Christoffer Dall wrote:
> >On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
> >>Currently external aborts are unsupported by the guest abort
> >>handling. Add handling for SEAs so that the host kernel reports
> >>SEAs which occur in the guest kernel.
> >>
> >>When an SEA occurs in the guest kernel, the guest exits and is
> >>routed to kvm_handle_guest_abort(). Prior to this patch, a print
> >>message of an unsupported FSC would be printed and nothing else
> >>would happen. With this patch, the code gets routed to the APEI
> >>handling of SEAs in the host kernel to report the SEA information.
> >>
> >>Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> >>Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> >>Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> >>---
> >>  arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
> >>  arch/arm/include/asm/system_misc.h   |  5 +++++
> >>  arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
> >>  arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
> >>  arch/arm64/include/asm/system_misc.h |  2 ++
> >>  arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
> >>  drivers/acpi/apei/ghes.c             | 13 +++++++------
> >>  include/acpi/ghes.h                  |  2 +-
> >>  8 files changed, 87 insertions(+), 12 deletions(-)
> >>
> >>diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
> >>index a3f0b3d..ebf020b 100644
> >>--- a/arch/arm/include/asm/kvm_arm.h
> >>+++ b/arch/arm/include/asm/kvm_arm.h
> >>@@ -187,6 +187,16 @@
> >>  #define FSC_FAULT	(0x04)
> >>  #define FSC_ACCESS	(0x08)
> >>  #define FSC_PERM	(0x0c)
> >>+#define FSC_SEA		(0x10)
> >>+#define FSC_SEA_TTW0	(0x14)
> >>+#define FSC_SEA_TTW1	(0x15)
> >>+#define FSC_SEA_TTW2	(0x16)
> >>+#define FSC_SEA_TTW3	(0x17)
> >>+#define FSC_SECC	(0x18)
> >>+#define FSC_SECC_TTW0	(0x1c)
> >>+#define FSC_SECC_TTW1	(0x1d)
> >>+#define FSC_SECC_TTW2	(0x1e)
> >>+#define FSC_SECC_TTW3	(0x1f)
> >>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
> >>  #define HPFAR_MASK	(~0xf)
> >>diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
> >>index a3d61ad..8c4a89f 100644
> >>--- a/arch/arm/include/asm/system_misc.h
> >>+++ b/arch/arm/include/asm/system_misc.h
> >>@@ -22,6 +22,11 @@
> >>  extern unsigned int user_debug;
> >>+static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> >>+{
> >>+	return -1;
> >>+}
> >>+
> >>  #endif /* !__ASSEMBLY__ */
> >>  #endif /* __ASM_ARM_SYSTEM_MISC_H */
> >>diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> >>index 962616f..9a977c8 100644
> >>--- a/arch/arm/kvm/mmu.c
> >>+++ b/arch/arm/kvm/mmu.c
> >>@@ -29,6 +29,7 @@
> >>  #include <asm/kvm_asm.h>
> >>  #include <asm/kvm_emulate.h>
> >>  #include <asm/virt.h>
> >>+#include <asm/system_misc.h>
> >>  #include "trace.h"
> >>@@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
> >>  		kvm_set_pfn_accessed(pfn);
> >>  }
> >>+static bool is_abort_sea(unsigned long fault_status) {
> >>+	switch (fault_status) {
> >>+	case FSC_SEA:
> >>+	case FSC_SEA_TTW0:
> >>+	case FSC_SEA_TTW1:
> >>+	case FSC_SEA_TTW2:
> >>+	case FSC_SEA_TTW3:
> >>+	case FSC_SECC:
> >>+	case FSC_SECC_TTW0:
> >>+	case FSC_SECC_TTW1:
> >>+	case FSC_SECC_TTW2:
> >>+	case FSC_SECC_TTW3:
> >>+		return true;
> >>+	default:
> >>+		return false;
> >>+	}
> >>+}
> >>+
> >>  /**
> >>   * kvm_handle_guest_abort - handles all 2nd stage aborts
> >>   * @vcpu:	the VCPU pointer
> >>@@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
> >>  	gfn_t gfn;
> >>  	int ret, idx;
> >>+	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> >>+
> >>+	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> >>+
> >>+	/*
> >>+	 * The host kernel will handle the synchronous external abort. There
> >>+	 * is no need to pass the error into the guest.
> >>+	 */
> >>+	if (is_abort_sea(fault_status))
> >>+		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
> >>+			return 1;
> >>+
> >So what's the logic in presenting this as a vabt to the guest when the
> >host couldn't handle it?  What do you do in other parts of the kernel if
> >you see an abort that the host cannot handle?
> The only cases that handle_guest_sea() will not return zero are
> there is no error to process
> (firmware support isn't there) or the error populated is invalid. If
> there is no error to process,
> we want to continue here with the handling that exists. If the error
> is invalid then GHES will
> report that and since the error wasn't handled properly we should
> continue with existing
> handling.
> 
> If there is an abort that GHES fails to handle in the host then GHES
> just reports that and we
> also continue with the abort handling.

Hmmm, I don't see how the guest can possibly handle the error better
than the host in this situation, where the host has already decided that
there is either no error or we have no way to obtain information about
that error.

Regardless of existing behavior that seems weird, but I suppose one
could argue that something strange happened while running the guest and
it should be notified somehow.

Anyway, I may just be failing to come up with a scenario where it makes
sense.

> >
> >nit: I'd prefer to see braces around the the multi-line block above.
> I will add braces.
> >
> >
> >>  	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
> >>  	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
> >>  		kvm_inject_vabt(vcpu);
> >>  		return 1;
> >>  	}
> >>-	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> >>-
> >>  	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
> >>  			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
> >>  	/* Check the stage-2 fault is trans. fault or write fault */
> >>-	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> >>  	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
> >>  	    fault_status != FSC_ACCESS) {
> >>  		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
> >>diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> >>index 6e99978..61d694c 100644
> >>--- a/arch/arm64/include/asm/kvm_arm.h
> >>+++ b/arch/arm64/include/asm/kvm_arm.h
> >>@@ -204,6 +204,16 @@
> >>  #define FSC_FAULT	ESR_ELx_FSC_FAULT
> >>  #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
> >>  #define FSC_PERM	ESR_ELx_FSC_PERM
> >>+#define FSC_SEA		ESR_ELx_FSC_EXTABT
> >>+#define FSC_SEA_TTW0	(0x14)
> >>+#define FSC_SEA_TTW1	(0x15)
> >>+#define FSC_SEA_TTW2	(0x16)
> >>+#define FSC_SEA_TTW3	(0x17)
> >>+#define FSC_SECC	(0x18)
> >>+#define FSC_SECC_TTW0	(0x1c)
> >>+#define FSC_SECC_TTW1	(0x1d)
> >>+#define FSC_SECC_TTW2	(0x1e)
> >>+#define FSC_SECC_TTW3	(0x1f)
> >>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
> >>  #define HPFAR_MASK	(~UL(0xf))
> >>diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
> >>index bc81243..95aa442 100644
> >>--- a/arch/arm64/include/asm/system_misc.h
> >>+++ b/arch/arm64/include/asm/system_misc.h
> >>@@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
> >>  	__show_ratelimited;						\
> >>  })
> >>+int handle_guest_sea(phys_addr_t addr, unsigned int esr);
> >>+
> >>  #endif	/* __ASSEMBLY__ */
> >>  #endif	/* __ASM_SYSTEM_MISC_H */
> >>diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> >>index f7372ce..3abb367 100644
> >>--- a/arch/arm64/mm/fault.c
> >>+++ b/arch/arm64/mm/fault.c
> >>@@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  {
> >>  	struct siginfo info;
> >>+	int ret = 0;
> >>  	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
> >>  		 fault_name(esr), esr, addr);
> >>@@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  	 */
> >>  	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> >>  		nmi_enter();
> >>-		ghes_notify_sea();
> >>+		ret = ghes_notify_sea();
> >>  		nmi_exit();
> >>  	}
> >>@@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  		info.si_addr  = (void __user *)addr;
> >>  	arm64_notify_die("", regs, &info, esr);
> >>-	return 0;
> >>+	return ret;
> >>  }
> >>  static const struct fault_info {
> >>@@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
> >>  }
> >>  /*
> >>+ * Handle Synchronous External Aborts that occur in a guest kernel.
> >>+ *
> >>+ * The return value will be zero if the SEA was successfully handled
> >>+ * and non-zero if there was an error processing the error or there was
> >>+ * no error to process.
> >>+ */
> >>+int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> >>+{
> >>+	int ret = -ENOENT;
> >>+
> >>+	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> >nit: missing white space
> I will add the space.
> >
> >>+		ret = ghes_notify_sea();
> >>+	}
> >>+
> >>+	return ret;
> >>+}
> >>+
> >>+/*
> >>   * Dispatch a data abort to the relevant handler.
> >>   */
> >>  asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
> >>diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> >>index 230b095..81eabc6 100644
> >>--- a/drivers/acpi/apei/ghes.c
> >>+++ b/drivers/acpi/apei/ghes.c
> >>@@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
> >>  #ifdef CONFIG_ACPI_APEI_SEA
> >>  static LIST_HEAD(ghes_sea);
> >>-void ghes_notify_sea(void)
> >>+int ghes_notify_sea(void)
> >>  {
> >>  	struct ghes *ghes;
> >>+	int ret = -ENOENT;
> >>-	/*
> >>-	 * synchronize_rcu() will wait for nmi_exit(), so no need to
> >>-	 * rcu_read_lock().
> >>-	 */
> >>+	rcu_read_lock();
> >>  	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
> >>-		ghes_proc(ghes);
> >>+		if(!ghes_proc(ghes))
> >>+			ret = 0;
> >>  	}
> >>+	rcu_read_unlock();
> >>+	return ret;
> >>  }
> >>  static void ghes_sea_add(struct ghes *ghes)
> >>diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> >>index 18bc935..2a727dc 100644
> >>--- a/include/acpi/ghes.h
> >>+++ b/include/acpi/ghes.h
> >>@@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
> >>  		gdata + 1;
> >>  }
> >>-void ghes_notify_sea(void);
> >>+int ghes_notify_sea(void);
> >>  #endif /* GHES_H */
> >>-- 
> >I feel like the changes to acpi/arm64 in this patch could have been a
> >separate patch or folded into previous patches, but for the KVM part of
> >this patch:
> >
> >Acked-by: Christoffer Dall <cdall@linaro.org>
> Thank you. I can break out the GHES changes if that is really desired.
> 
That's not for me to say, so if Catalin is happy with the current split,
you don't have to respin just for that or for the nits I pointed out on
account of me.

Thanks,
-Christoffer

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
@ 2017-03-28 22:18         ` Christoffer Dall
  0 siblings, 0 replies; 80+ messages in thread
From: Christoffer Dall @ 2017-03-28 22:18 UTC (permalink / raw)
  To: Baicar, Tyler
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On Tue, Mar 28, 2017 at 03:33:17PM -0600, Baicar, Tyler wrote:
> Hello Christoffer,
> 
> 
> On 3/28/2017 2:26 PM, Christoffer Dall wrote:
> >On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
> >>Currently external aborts are unsupported by the guest abort
> >>handling. Add handling for SEAs so that the host kernel reports
> >>SEAs which occur in the guest kernel.
> >>
> >>When an SEA occurs in the guest kernel, the guest exits and is
> >>routed to kvm_handle_guest_abort(). Prior to this patch, a print
> >>message of an unsupported FSC would be printed and nothing else
> >>would happen. With this patch, the code gets routed to the APEI
> >>handling of SEAs in the host kernel to report the SEA information.
> >>
> >>Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> >>Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> >>Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> >>---
> >>  arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
> >>  arch/arm/include/asm/system_misc.h   |  5 +++++
> >>  arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
> >>  arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
> >>  arch/arm64/include/asm/system_misc.h |  2 ++
> >>  arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
> >>  drivers/acpi/apei/ghes.c             | 13 +++++++------
> >>  include/acpi/ghes.h                  |  2 +-
> >>  8 files changed, 87 insertions(+), 12 deletions(-)
> >>
> >>diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
> >>index a3f0b3d..ebf020b 100644
> >>--- a/arch/arm/include/asm/kvm_arm.h
> >>+++ b/arch/arm/include/asm/kvm_arm.h
> >>@@ -187,6 +187,16 @@
> >>  #define FSC_FAULT	(0x04)
> >>  #define FSC_ACCESS	(0x08)
> >>  #define FSC_PERM	(0x0c)
> >>+#define FSC_SEA		(0x10)
> >>+#define FSC_SEA_TTW0	(0x14)
> >>+#define FSC_SEA_TTW1	(0x15)
> >>+#define FSC_SEA_TTW2	(0x16)
> >>+#define FSC_SEA_TTW3	(0x17)
> >>+#define FSC_SECC	(0x18)
> >>+#define FSC_SECC_TTW0	(0x1c)
> >>+#define FSC_SECC_TTW1	(0x1d)
> >>+#define FSC_SECC_TTW2	(0x1e)
> >>+#define FSC_SECC_TTW3	(0x1f)
> >>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
> >>  #define HPFAR_MASK	(~0xf)
> >>diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
> >>index a3d61ad..8c4a89f 100644
> >>--- a/arch/arm/include/asm/system_misc.h
> >>+++ b/arch/arm/include/asm/system_misc.h
> >>@@ -22,6 +22,11 @@
> >>  extern unsigned int user_debug;
> >>+static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> >>+{
> >>+	return -1;
> >>+}
> >>+
> >>  #endif /* !__ASSEMBLY__ */
> >>  #endif /* __ASM_ARM_SYSTEM_MISC_H */
> >>diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> >>index 962616f..9a977c8 100644
> >>--- a/arch/arm/kvm/mmu.c
> >>+++ b/arch/arm/kvm/mmu.c
> >>@@ -29,6 +29,7 @@
> >>  #include <asm/kvm_asm.h>
> >>  #include <asm/kvm_emulate.h>
> >>  #include <asm/virt.h>
> >>+#include <asm/system_misc.h>
> >>  #include "trace.h"
> >>@@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
> >>  		kvm_set_pfn_accessed(pfn);
> >>  }
> >>+static bool is_abort_sea(unsigned long fault_status) {
> >>+	switch (fault_status) {
> >>+	case FSC_SEA:
> >>+	case FSC_SEA_TTW0:
> >>+	case FSC_SEA_TTW1:
> >>+	case FSC_SEA_TTW2:
> >>+	case FSC_SEA_TTW3:
> >>+	case FSC_SECC:
> >>+	case FSC_SECC_TTW0:
> >>+	case FSC_SECC_TTW1:
> >>+	case FSC_SECC_TTW2:
> >>+	case FSC_SECC_TTW3:
> >>+		return true;
> >>+	default:
> >>+		return false;
> >>+	}
> >>+}
> >>+
> >>  /**
> >>   * kvm_handle_guest_abort - handles all 2nd stage aborts
> >>   * @vcpu:	the VCPU pointer
> >>@@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
> >>  	gfn_t gfn;
> >>  	int ret, idx;
> >>+	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> >>+
> >>+	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> >>+
> >>+	/*
> >>+	 * The host kernel will handle the synchronous external abort. There
> >>+	 * is no need to pass the error into the guest.
> >>+	 */
> >>+	if (is_abort_sea(fault_status))
> >>+		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
> >>+			return 1;
> >>+
> >So what's the logic in presenting this as a vabt to the guest when the
> >host couldn't handle it?  What do you do in other parts of the kernel if
> >you see an abort that the host cannot handle?
> The only cases that handle_guest_sea() will not return zero are
> there is no error to process
> (firmware support isn't there) or the error populated is invalid. If
> there is no error to process,
> we want to continue here with the handling that exists. If the error
> is invalid then GHES will
> report that and since the error wasn't handled properly we should
> continue with existing
> handling.
> 
> If there is an abort that GHES fails to handle in the host then GHES
> just reports that and we
> also continue with the abort handling.

Hmmm, I don't see how the guest can possibly handle the error better
than the host in this situation, where the host has already decided that
there is either no error or we have no way to obtain information about
that error.

Regardless of existing behavior that seems weird, but I suppose one
could argue that something strange happened while running the guest and
it should be notified somehow.

Anyway, I may just be failing to come up with a scenario where it makes
sense.

> >
> >nit: I'd prefer to see braces around the the multi-line block above.
> I will add braces.
> >
> >
> >>  	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
> >>  	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
> >>  		kvm_inject_vabt(vcpu);
> >>  		return 1;
> >>  	}
> >>-	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> >>-
> >>  	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
> >>  			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
> >>  	/* Check the stage-2 fault is trans. fault or write fault */
> >>-	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> >>  	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
> >>  	    fault_status != FSC_ACCESS) {
> >>  		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
> >>diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> >>index 6e99978..61d694c 100644
> >>--- a/arch/arm64/include/asm/kvm_arm.h
> >>+++ b/arch/arm64/include/asm/kvm_arm.h
> >>@@ -204,6 +204,16 @@
> >>  #define FSC_FAULT	ESR_ELx_FSC_FAULT
> >>  #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
> >>  #define FSC_PERM	ESR_ELx_FSC_PERM
> >>+#define FSC_SEA		ESR_ELx_FSC_EXTABT
> >>+#define FSC_SEA_TTW0	(0x14)
> >>+#define FSC_SEA_TTW1	(0x15)
> >>+#define FSC_SEA_TTW2	(0x16)
> >>+#define FSC_SEA_TTW3	(0x17)
> >>+#define FSC_SECC	(0x18)
> >>+#define FSC_SECC_TTW0	(0x1c)
> >>+#define FSC_SECC_TTW1	(0x1d)
> >>+#define FSC_SECC_TTW2	(0x1e)
> >>+#define FSC_SECC_TTW3	(0x1f)
> >>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
> >>  #define HPFAR_MASK	(~UL(0xf))
> >>diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
> >>index bc81243..95aa442 100644
> >>--- a/arch/arm64/include/asm/system_misc.h
> >>+++ b/arch/arm64/include/asm/system_misc.h
> >>@@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
> >>  	__show_ratelimited;						\
> >>  })
> >>+int handle_guest_sea(phys_addr_t addr, unsigned int esr);
> >>+
> >>  #endif	/* __ASSEMBLY__ */
> >>  #endif	/* __ASM_SYSTEM_MISC_H */
> >>diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> >>index f7372ce..3abb367 100644
> >>--- a/arch/arm64/mm/fault.c
> >>+++ b/arch/arm64/mm/fault.c
> >>@@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  {
> >>  	struct siginfo info;
> >>+	int ret = 0;
> >>  	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
> >>  		 fault_name(esr), esr, addr);
> >>@@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  	 */
> >>  	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> >>  		nmi_enter();
> >>-		ghes_notify_sea();
> >>+		ret = ghes_notify_sea();
> >>  		nmi_exit();
> >>  	}
> >>@@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  		info.si_addr  = (void __user *)addr;
> >>  	arm64_notify_die("", regs, &info, esr);
> >>-	return 0;
> >>+	return ret;
> >>  }
> >>  static const struct fault_info {
> >>@@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
> >>  }
> >>  /*
> >>+ * Handle Synchronous External Aborts that occur in a guest kernel.
> >>+ *
> >>+ * The return value will be zero if the SEA was successfully handled
> >>+ * and non-zero if there was an error processing the error or there was
> >>+ * no error to process.
> >>+ */
> >>+int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> >>+{
> >>+	int ret = -ENOENT;
> >>+
> >>+	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> >nit: missing white space
> I will add the space.
> >
> >>+		ret = ghes_notify_sea();
> >>+	}
> >>+
> >>+	return ret;
> >>+}
> >>+
> >>+/*
> >>   * Dispatch a data abort to the relevant handler.
> >>   */
> >>  asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
> >>diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> >>index 230b095..81eabc6 100644
> >>--- a/drivers/acpi/apei/ghes.c
> >>+++ b/drivers/acpi/apei/ghes.c
> >>@@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
> >>  #ifdef CONFIG_ACPI_APEI_SEA
> >>  static LIST_HEAD(ghes_sea);
> >>-void ghes_notify_sea(void)
> >>+int ghes_notify_sea(void)
> >>  {
> >>  	struct ghes *ghes;
> >>+	int ret = -ENOENT;
> >>-	/*
> >>-	 * synchronize_rcu() will wait for nmi_exit(), so no need to
> >>-	 * rcu_read_lock().
> >>-	 */
> >>+	rcu_read_lock();
> >>  	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
> >>-		ghes_proc(ghes);
> >>+		if(!ghes_proc(ghes))
> >>+			ret = 0;
> >>  	}
> >>+	rcu_read_unlock();
> >>+	return ret;
> >>  }
> >>  static void ghes_sea_add(struct ghes *ghes)
> >>diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> >>index 18bc935..2a727dc 100644
> >>--- a/include/acpi/ghes.h
> >>+++ b/include/acpi/ghes.h
> >>@@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
> >>  		gdata + 1;
> >>  }
> >>-void ghes_notify_sea(void);
> >>+int ghes_notify_sea(void);
> >>  #endif /* GHES_H */
> >>-- 
> >I feel like the changes to acpi/arm64 in this patch could have been a
> >separate patch or folded into previous patches, but for the KVM part of
> >this patch:
> >
> >Acked-by: Christoffer Dall <cdall@linaro.org>
> Thank you. I can break out the GHES changes if that is really desired.
> 
That's not for me to say, so if Catalin is happy with the current split,
you don't have to respin just for that or for the nits I pointed out on
account of me.

Thanks,
-Christoffer

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support
@ 2017-03-28 22:18         ` Christoffer Dall
  0 siblings, 0 replies; 80+ messages in thread
From: Christoffer Dall @ 2017-03-28 22:18 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, Mar 28, 2017 at 03:33:17PM -0600, Baicar, Tyler wrote:
> Hello Christoffer,
> 
> 
> On 3/28/2017 2:26 PM, Christoffer Dall wrote:
> >On Tue, Mar 28, 2017 at 01:30:40PM -0600, Tyler Baicar wrote:
> >>Currently external aborts are unsupported by the guest abort
> >>handling. Add handling for SEAs so that the host kernel reports
> >>SEAs which occur in the guest kernel.
> >>
> >>When an SEA occurs in the guest kernel, the guest exits and is
> >>routed to kvm_handle_guest_abort(). Prior to this patch, a print
> >>message of an unsupported FSC would be printed and nothing else
> >>would happen. With this patch, the code gets routed to the APEI
> >>handling of SEAs in the host kernel to report the SEA information.
> >>
> >>Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> >>Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> >>Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> >>---
> >>  arch/arm/include/asm/kvm_arm.h       | 10 ++++++++++
> >>  arch/arm/include/asm/system_misc.h   |  5 +++++
> >>  arch/arm/kvm/mmu.c                   | 34 +++++++++++++++++++++++++++++++---
> >>  arch/arm64/include/asm/kvm_arm.h     | 10 ++++++++++
> >>  arch/arm64/include/asm/system_misc.h |  2 ++
> >>  arch/arm64/mm/fault.c                | 23 +++++++++++++++++++++--
> >>  drivers/acpi/apei/ghes.c             | 13 +++++++------
> >>  include/acpi/ghes.h                  |  2 +-
> >>  8 files changed, 87 insertions(+), 12 deletions(-)
> >>
> >>diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
> >>index a3f0b3d..ebf020b 100644
> >>--- a/arch/arm/include/asm/kvm_arm.h
> >>+++ b/arch/arm/include/asm/kvm_arm.h
> >>@@ -187,6 +187,16 @@
> >>  #define FSC_FAULT	(0x04)
> >>  #define FSC_ACCESS	(0x08)
> >>  #define FSC_PERM	(0x0c)
> >>+#define FSC_SEA		(0x10)
> >>+#define FSC_SEA_TTW0	(0x14)
> >>+#define FSC_SEA_TTW1	(0x15)
> >>+#define FSC_SEA_TTW2	(0x16)
> >>+#define FSC_SEA_TTW3	(0x17)
> >>+#define FSC_SECC	(0x18)
> >>+#define FSC_SECC_TTW0	(0x1c)
> >>+#define FSC_SECC_TTW1	(0x1d)
> >>+#define FSC_SECC_TTW2	(0x1e)
> >>+#define FSC_SECC_TTW3	(0x1f)
> >>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
> >>  #define HPFAR_MASK	(~0xf)
> >>diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
> >>index a3d61ad..8c4a89f 100644
> >>--- a/arch/arm/include/asm/system_misc.h
> >>+++ b/arch/arm/include/asm/system_misc.h
> >>@@ -22,6 +22,11 @@
> >>  extern unsigned int user_debug;
> >>+static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> >>+{
> >>+	return -1;
> >>+}
> >>+
> >>  #endif /* !__ASSEMBLY__ */
> >>  #endif /* __ASM_ARM_SYSTEM_MISC_H */
> >>diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> >>index 962616f..9a977c8 100644
> >>--- a/arch/arm/kvm/mmu.c
> >>+++ b/arch/arm/kvm/mmu.c
> >>@@ -29,6 +29,7 @@
> >>  #include <asm/kvm_asm.h>
> >>  #include <asm/kvm_emulate.h>
> >>  #include <asm/virt.h>
> >>+#include <asm/system_misc.h>
> >>  #include "trace.h"
> >>@@ -1406,6 +1407,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
> >>  		kvm_set_pfn_accessed(pfn);
> >>  }
> >>+static bool is_abort_sea(unsigned long fault_status) {
> >>+	switch (fault_status) {
> >>+	case FSC_SEA:
> >>+	case FSC_SEA_TTW0:
> >>+	case FSC_SEA_TTW1:
> >>+	case FSC_SEA_TTW2:
> >>+	case FSC_SEA_TTW3:
> >>+	case FSC_SECC:
> >>+	case FSC_SECC_TTW0:
> >>+	case FSC_SECC_TTW1:
> >>+	case FSC_SECC_TTW2:
> >>+	case FSC_SECC_TTW3:
> >>+		return true;
> >>+	default:
> >>+		return false;
> >>+	}
> >>+}
> >>+
> >>  /**
> >>   * kvm_handle_guest_abort - handles all 2nd stage aborts
> >>   * @vcpu:	the VCPU pointer
> >>@@ -1428,19 +1447,28 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
> >>  	gfn_t gfn;
> >>  	int ret, idx;
> >>+	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> >>+
> >>+	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> >>+
> >>+	/*
> >>+	 * The host kernel will handle the synchronous external abort. There
> >>+	 * is no need to pass the error into the guest.
> >>+	 */
> >>+	if (is_abort_sea(fault_status))
> >>+		if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
> >>+			return 1;
> >>+
> >So what's the logic in presenting this as a vabt to the guest when the
> >host couldn't handle it?  What do you do in other parts of the kernel if
> >you see an abort that the host cannot handle?
> The only cases that handle_guest_sea() will not return zero are
> there is no error to process
> (firmware support isn't there) or the error populated is invalid. If
> there is no error to process,
> we want to continue here with the handling that exists. If the error
> is invalid then GHES will
> report that and since the error wasn't handled properly we should
> continue with existing
> handling.
> 
> If there is an abort that GHES fails to handle in the host then GHES
> just reports that and we
> also continue with the abort handling.

Hmmm, I don't see how the guest can possibly handle the error better
than the host in this situation, where the host has already decided that
there is either no error or we have no way to obtain information about
that error.

Regardless of existing behavior that seems weird, but I suppose one
could argue that something strange happened while running the guest and
it should be notified somehow.

Anyway, I may just be failing to come up with a scenario where it makes
sense.

> >
> >nit: I'd prefer to see braces around the the multi-line block above.
> I will add braces.
> >
> >
> >>  	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
> >>  	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
> >>  		kvm_inject_vabt(vcpu);
> >>  		return 1;
> >>  	}
> >>-	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> >>-
> >>  	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
> >>  			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
> >>  	/* Check the stage-2 fault is trans. fault or write fault */
> >>-	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
> >>  	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
> >>  	    fault_status != FSC_ACCESS) {
> >>  		kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
> >>diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> >>index 6e99978..61d694c 100644
> >>--- a/arch/arm64/include/asm/kvm_arm.h
> >>+++ b/arch/arm64/include/asm/kvm_arm.h
> >>@@ -204,6 +204,16 @@
> >>  #define FSC_FAULT	ESR_ELx_FSC_FAULT
> >>  #define FSC_ACCESS	ESR_ELx_FSC_ACCESS
> >>  #define FSC_PERM	ESR_ELx_FSC_PERM
> >>+#define FSC_SEA		ESR_ELx_FSC_EXTABT
> >>+#define FSC_SEA_TTW0	(0x14)
> >>+#define FSC_SEA_TTW1	(0x15)
> >>+#define FSC_SEA_TTW2	(0x16)
> >>+#define FSC_SEA_TTW3	(0x17)
> >>+#define FSC_SECC	(0x18)
> >>+#define FSC_SECC_TTW0	(0x1c)
> >>+#define FSC_SECC_TTW1	(0x1d)
> >>+#define FSC_SECC_TTW2	(0x1e)
> >>+#define FSC_SECC_TTW3	(0x1f)
> >>  /* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
> >>  #define HPFAR_MASK	(~UL(0xf))
> >>diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
> >>index bc81243..95aa442 100644
> >>--- a/arch/arm64/include/asm/system_misc.h
> >>+++ b/arch/arm64/include/asm/system_misc.h
> >>@@ -56,6 +56,8 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
> >>  	__show_ratelimited;						\
> >>  })
> >>+int handle_guest_sea(phys_addr_t addr, unsigned int esr);
> >>+
> >>  #endif	/* __ASSEMBLY__ */
> >>  #endif	/* __ASM_SYSTEM_MISC_H */
> >>diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> >>index f7372ce..3abb367 100644
> >>--- a/arch/arm64/mm/fault.c
> >>+++ b/arch/arm64/mm/fault.c
> >>@@ -497,6 +497,7 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  {
> >>  	struct siginfo info;
> >>+	int ret = 0;
> >>  	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
> >>  		 fault_name(esr), esr, addr);
> >>@@ -508,7 +509,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  	 */
> >>  	if (IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> >>  		nmi_enter();
> >>-		ghes_notify_sea();
> >>+		ret = ghes_notify_sea();
> >>  		nmi_exit();
> >>  	}
> >>@@ -521,7 +522,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
> >>  		info.si_addr  = (void __user *)addr;
> >>  	arm64_notify_die("", regs, &info, esr);
> >>-	return 0;
> >>+	return ret;
> >>  }
> >>  static const struct fault_info {
> >>@@ -603,6 +604,24 @@ static const char *fault_name(unsigned int esr)
> >>  }
> >>  /*
> >>+ * Handle Synchronous External Aborts that occur in a guest kernel.
> >>+ *
> >>+ * The return value will be zero if the SEA was successfully handled
> >>+ * and non-zero if there was an error processing the error or there was
> >>+ * no error to process.
> >>+ */
> >>+int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> >>+{
> >>+	int ret = -ENOENT;
> >>+
> >>+	if(IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
> >nit: missing white space
> I will add the space.
> >
> >>+		ret = ghes_notify_sea();
> >>+	}
> >>+
> >>+	return ret;
> >>+}
> >>+
> >>+/*
> >>   * Dispatch a data abort to the relevant handler.
> >>   */
> >>  asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
> >>diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> >>index 230b095..81eabc6 100644
> >>--- a/drivers/acpi/apei/ghes.c
> >>+++ b/drivers/acpi/apei/ghes.c
> >>@@ -810,17 +810,18 @@ static int ghes_notify_sci(struct notifier_block *this,
> >>  #ifdef CONFIG_ACPI_APEI_SEA
> >>  static LIST_HEAD(ghes_sea);
> >>-void ghes_notify_sea(void)
> >>+int ghes_notify_sea(void)
> >>  {
> >>  	struct ghes *ghes;
> >>+	int ret = -ENOENT;
> >>-	/*
> >>-	 * synchronize_rcu() will wait for nmi_exit(), so no need to
> >>-	 * rcu_read_lock().
> >>-	 */
> >>+	rcu_read_lock();
> >>  	list_for_each_entry_rcu(ghes, &ghes_sea, list) {
> >>-		ghes_proc(ghes);
> >>+		if(!ghes_proc(ghes))
> >>+			ret = 0;
> >>  	}
> >>+	rcu_read_unlock();
> >>+	return ret;
> >>  }
> >>  static void ghes_sea_add(struct ghes *ghes)
> >>diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> >>index 18bc935..2a727dc 100644
> >>--- a/include/acpi/ghes.h
> >>+++ b/include/acpi/ghes.h
> >>@@ -99,6 +99,6 @@ static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data
> >>  		gdata + 1;
> >>  }
> >>-void ghes_notify_sea(void);
> >>+int ghes_notify_sea(void);
> >>  #endif /* GHES_H */
> >>-- 
> >I feel like the changes to acpi/arm64 in this patch could have been a
> >separate patch or folded into previous patches, but for the KVM part of
> >this patch:
> >
> >Acked-by: Christoffer Dall <cdall@linaro.org>
> Thank you. I can break out the GHES changes if that is really desired.
> 
That's not for me to say, so if Catalin is happy with the current split,
you don't have to respin just for that or for the nits I pointed out on
account of me.

Thanks,
-Christoffer

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64
  2017-03-28 19:30 ` Tyler Baicar
  (?)
@ 2017-04-06 17:12     ` Catalin Marinas
  -1 siblings, 0 replies; 80+ messages in thread
From: Catalin Marinas @ 2017-04-06 17:12 UTC (permalink / raw)
  To: rjw-LthD3rsA81gm4RdzfppkhA
  Cc: Tyler Baicar, christoffer.dall-QSEj5FYQhm4dnm+yROfE0A,
	marc.zyngier-5wv7dgnIgG8, pbonzini-H+wXaHxf7aLQT0dZR+AlfA,
	rkrcmar-H+wXaHxf7aLQT0dZR+AlfA, linux-I+IVW8TIWO2tmTQ+vhA3Yw,
	will.deacon-5wv7dgnIgG8, lenb-DgEjT+Ai2ygdnm+yROfE0A,
	matt-mF/unelCI9GS6iBeEJttW/XRex20P6io,
	robert.moore-ral2JQCrhuEAvxtiuMwx3w,
	lv.zheng-ral2JQCrhuEAvxtiuMwx3w, nkaje-sgV2jX0FEOL9JmXXK+q4OQ,
	zjzhang-sgV2jX0FEOL9JmXXK+q4OQ, mark.rutland-5wv7dgnIgG8,
	james.morse-5wv7dgnIgG8, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b,
	eun.taik.lee-Sze3O3UU22JBDgjK7y7TUQ,
	sandeepa.s.prabhu-Re5JQEeQqe8AvxtiuMwx3w,
	labbott-H+wXaHxf7aLQT0dZR+AlfA, shijie.huang-5wv7dgnIgG8,
	rruigrok-sgV2jX0FEOL9JmXXK+q4OQ,
	paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ, tn-nYOzD4b6Jr9Wk0Htik3J/w,
	fu.wei-QSEj5FYQhm4dnm+yROfE0A, rostedt-nx8X9YLhiw1AfugRpC6u6w,
	bristot-H+wXaHxf7aLQT0dZR+AlfA,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
	kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg,
	kvm-u79uwXL29TY76Z2rM5mHXA, linux-kernel-u79uwXL29TY76Z2rM5mHXA,
	linux-acpi-u79uwXL29TY76Z2rM5mHXA,
	linux-efi-u79uwXL29TY76Z2rM5mHXA, dev

Hi Rafael,

On Tue, Mar 28, 2017 at 01:30:30PM -0600, Tyler Baicar wrote:
> Tyler Baicar (9):
>   acpi: apei: read ack upon ghes record consumption
>   ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
>   efi: parse ARM processor error
>   arm64: exception: handle Synchronous External Abort
>   acpi: apei: handle SEA notification type for ARMv8
>   efi: print unrecognized CPER section
>   ras: acpi / apei: generate trace event for unrecognized CPER section
>   trace, ras: add ARM processor error trace event
>   arm/arm64: KVM: add guest SEA support

It looks like the KVM parts are getting acked and the arm64 and efi bits
have been acked as well. Are you ok to take this series through the ACPI
tree?

Thanks.

-- 
Catalin

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64
@ 2017-04-06 17:12     ` Catalin Marinas
  0 siblings, 0 replies; 80+ messages in thread
From: Catalin Marinas @ 2017-04-06 17:12 UTC (permalink / raw)
  To: rjw
  Cc: Tyler Baicar, christoffer.dall, marc.zyngier, pbonzini, rkrcmar,
	linux, will.deacon, lenb, matt, robert.moore, lv.zheng, nkaje,
	zjzhang, mark.rutland, james.morse, akpm, eun.taik.lee,
	sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

Hi Rafael,

On Tue, Mar 28, 2017 at 01:30:30PM -0600, Tyler Baicar wrote:
> Tyler Baicar (9):
>   acpi: apei: read ack upon ghes record consumption
>   ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
>   efi: parse ARM processor error
>   arm64: exception: handle Synchronous External Abort
>   acpi: apei: handle SEA notification type for ARMv8
>   efi: print unrecognized CPER section
>   ras: acpi / apei: generate trace event for unrecognized CPER section
>   trace, ras: add ARM processor error trace event
>   arm/arm64: KVM: add guest SEA support

It looks like the KVM parts are getting acked and the arm64 and efi bits
have been acked as well. Are you ok to take this series through the ACPI
tree?

Thanks.

-- 
Catalin

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64
@ 2017-04-06 17:12     ` Catalin Marinas
  0 siblings, 0 replies; 80+ messages in thread
From: Catalin Marinas @ 2017-04-06 17:12 UTC (permalink / raw)
  To: linux-arm-kernel

Hi Rafael,

On Tue, Mar 28, 2017 at 01:30:30PM -0600, Tyler Baicar wrote:
> Tyler Baicar (9):
>   acpi: apei: read ack upon ghes record consumption
>   ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
>   efi: parse ARM processor error
>   arm64: exception: handle Synchronous External Abort
>   acpi: apei: handle SEA notification type for ARMv8
>   efi: print unrecognized CPER section
>   ras: acpi / apei: generate trace event for unrecognized CPER section
>   trace, ras: add ARM processor error trace event
>   arm/arm64: KVM: add guest SEA support

It looks like the KVM parts are getting acked and the arm64 and efi bits
have been acked as well. Are you ok to take this series through the ACPI
tree?

Thanks.

-- 
Catalin

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
  2017-03-28 19:30   ` Tyler Baicar
  (?)
  (?)
@ 2017-04-11 17:15       ` Borislav Petkov
  -1 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-11 17:15 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall-QSEj5FYQhm4dnm+yROfE0A,
	marc.zyngier-5wv7dgnIgG8, pbonzini-H+wXaHxf7aLQT0dZR+AlfA,
	rkrcmar-H+wXaHxf7aLQT0dZR+AlfA, linux-I+IVW8TIWO2tmTQ+vhA3Yw,
	catalin.marinas-5wv7dgnIgG8, will.deacon-5wv7dgnIgG8,
	rjw-LthD3rsA81gm4RdzfppkhA, lenb-DgEjT+Ai2ygdnm+yROfE0A,
	matt-mF/unelCI9GS6iBeEJttW/XRex20P6io,
	robert.moore-ral2JQCrhuEAvxtiuMwx3w,
	lv.zheng-ral2JQCrhuEAvxtiuMwx3w, nkaje-sgV2jX0FEOL9JmXXK+q4OQ,
	zjzhang-sgV2jX0FEOL9JmXXK+q4OQ, mark.rutland-5wv7dgnIgG8,
	james.morse-5wv7dgnIgG8, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b,
	eun.taik.lee-Sze3O3UU22JBDgjK7y7TUQ,
	sandeepa.s.prabhu-Re5JQEeQqe8AvxtiuMwx3w,
	labbott-H+wXaHxf7aLQT0dZR+AlfA, shijie.huang-5wv7dgnIgG8,
	rruigrok-sgV2jX0FEOL9JmXXK+q4OQ,
	paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ, tn-nYOzD4b6Jr9Wk0Htik3J/w,
	fu.wei-QSEj5FYQhm4dnm+yROfE0A, rostedt-nx8X9YLhiw1AfugRpC6u6w,
	bristot-H+wXaHxf7aLQT0dZR+AlfA,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
	kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg,
	kvm-u79uwXL29TY76Z2rM5mHXA, linux-kernel-u79uwXL29TY76Z2rM5mHXA,
	linux-acpi-u79uwXL29TY76Z2rM5mHXA,
	linux-efi-u79uwXL29TY76Z2rM5mHXA

On Tue, Mar 28, 2017 at 01:30:31PM -0600, Tyler Baicar wrote:
> A RAS (Reliability, Availability, Serviceability) controller
> may be a separate processor running in parallel with OS
> execution, and may generate error records for consumption by
> the OS. If the RAS controller produces multiple error records,
> then they may be overwritten before the OS has consumed them.
> 
> The Generic Hardware Error Source (GHES) v2 structure
> introduces the capability for the OS to acknowledge the
> consumption of the error record generated by the RAS
> controller. A RAS controller supporting GHESv2 shall wait for
> the acknowledgment before writing a new error record, thus
> eliminating the race condition.
> 
> Add support for parsing of GHESv2 sub-tables as well.
> 
> Signed-off-by: Tyler Baicar <tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> Reviewed-by: James Morse <james.morse-5wv7dgnIgG8@public.gmane.org>
> ---
>  drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
>  drivers/acpi/apei/hest.c |  7 +++++--
>  include/acpi/ghes.h      |  5 ++++-
>  3 files changed, 55 insertions(+), 6 deletions(-)

...

> @@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
>  	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
>  	if (!ghes)
>  		return ERR_PTR(-ENOMEM);
> +
>  	ghes->generic = generic;
> +	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
> +		rc = apei_map_generic_address(
> +			&ghes->generic_v2->read_ack_register);

Yeah, that linebreak just to keep the 80-cols rule makes the code ugly
and hard to read.

Please put that mapping and unmapping in wrappers called
map_gen_v2(ghes) and unmap_gen_v2(ghes) or so, so that you can call them
wherever needed. Thus should make the flow a bit more understandable
what's going on and you won't have to repeat the unmapping lines in
ghes_fini().

> @@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
>  	rcu_read_unlock();
>  }
>  
> +static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
> +{
> +	int rc;
> +	u64 val = 0;
> +
> +	rc = apei_read(&val, &generic_v2->read_ack_register);
> +	if (rc)
> +		return rc;
> +	val &= generic_v2->read_ack_preserve <<
> +		generic_v2->read_ack_register.bit_offset;
> +	val |= generic_v2->read_ack_write <<
> +		generic_v2->read_ack_register.bit_offset;

Yeah, let them stick out, it more readable this way. Line spacing is
helpful too:

...
        rc = apei_read(&val, &generic_v2->read_ack_register);
        if (rc)
                return rc;

        val &= generic_v2->read_ack_preserve << generic_v2->read_ack_register.bit_offset;
        val |= generic_v2->read_ack_write    << generic_v2->read_ack_register.bit_offset;

        return apei_write(val, &generic_v2->read_ack_register);
}

> +	rc = apei_write(val, &generic_v2->read_ack_register);
> +
> +	return rc;
> +}
> +
>  static int ghes_proc(struct ghes *ghes)
>  {
>  	int rc;
-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
@ 2017-04-11 17:15       ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-11 17:15 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On Tue, Mar 28, 2017 at 01:30:31PM -0600, Tyler Baicar wrote:
> A RAS (Reliability, Availability, Serviceability) controller
> may be a separate processor running in parallel with OS
> execution, and may generate error records for consumption by
> the OS. If the RAS controller produces multiple error records,
> then they may be overwritten before the OS has consumed them.
> 
> The Generic Hardware Error Source (GHES) v2 structure
> introduces the capability for the OS to acknowledge the
> consumption of the error record generated by the RAS
> controller. A RAS controller supporting GHESv2 shall wait for
> the acknowledgment before writing a new error record, thus
> eliminating the race condition.
> 
> Add support for parsing of GHESv2 sub-tables as well.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> ---
>  drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
>  drivers/acpi/apei/hest.c |  7 +++++--
>  include/acpi/ghes.h      |  5 ++++-
>  3 files changed, 55 insertions(+), 6 deletions(-)

...

> @@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
>  	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
>  	if (!ghes)
>  		return ERR_PTR(-ENOMEM);
> +
>  	ghes->generic = generic;
> +	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
> +		rc = apei_map_generic_address(
> +			&ghes->generic_v2->read_ack_register);

Yeah, that linebreak just to keep the 80-cols rule makes the code ugly
and hard to read.

Please put that mapping and unmapping in wrappers called
map_gen_v2(ghes) and unmap_gen_v2(ghes) or so, so that you can call them
wherever needed. Thus should make the flow a bit more understandable
what's going on and you won't have to repeat the unmapping lines in
ghes_fini().

> @@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
>  	rcu_read_unlock();
>  }
>  
> +static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
> +{
> +	int rc;
> +	u64 val = 0;
> +
> +	rc = apei_read(&val, &generic_v2->read_ack_register);
> +	if (rc)
> +		return rc;
> +	val &= generic_v2->read_ack_preserve <<
> +		generic_v2->read_ack_register.bit_offset;
> +	val |= generic_v2->read_ack_write <<
> +		generic_v2->read_ack_register.bit_offset;

Yeah, let them stick out, it more readable this way. Line spacing is
helpful too:

...
        rc = apei_read(&val, &generic_v2->read_ack_register);
        if (rc)
                return rc;

        val &= generic_v2->read_ack_preserve << generic_v2->read_ack_register.bit_offset;
        val |= generic_v2->read_ack_write    << generic_v2->read_ack_register.bit_offset;

        return apei_write(val, &generic_v2->read_ack_register);
}

> +	rc = apei_write(val, &generic_v2->read_ack_register);
> +
> +	return rc;
> +}
> +
>  static int ghes_proc(struct ghes *ghes)
>  {
>  	int rc;
-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
@ 2017-04-11 17:15       ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-11 17:15 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall-QSEj5FYQhm4dnm+yROfE0A,
	marc.zyngier-5wv7dgnIgG8, pbonzini-H+wXaHxf7aLQT0dZR+AlfA,
	rkrcmar-H+wXaHxf7aLQT0dZR+AlfA, linux-I+IVW8TIWO2tmTQ+vhA3Yw,
	catalin.marinas-5wv7dgnIgG8, will.deacon-5wv7dgnIgG8,
	rjw-LthD3rsA81gm4RdzfppkhA, lenb-DgEjT+Ai2ygdnm+yROfE0A,
	matt-mF/unelCI9GS6iBeEJttW/XRex20P6io,
	robert.moore-ral2JQCrhuEAvxtiuMwx3w,
	lv.zheng-ral2JQCrhuEAvxtiuMwx3w, nkaje-sgV2jX0FEOL9JmXXK+q4OQ,
	zjzhang-sgV2jX0FEOL9JmXXK+q4OQ, mark.rutland-5wv7dgnIgG8,
	james.morse-5wv7dgnIgG8, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b,
	eun.taik.lee-Sze3O3UU22JBDgjK7y7TUQ,
	sandeepa.s.prabhu-Re5JQEeQqe8AvxtiuMwx3w,
	labbott-H+wXaHxf7aLQT0dZR+AlfA, shijie.huang-5wv7dgnIgG8,
	rruigrok-sgV2jX0FEOL9JmXXK+q4OQ,
	paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ, tn-nYOzD4b6Jr9Wk0Htik3J/w,
	fu.wei-QSEj5FYQhm4dnm+yROfE0A, rostedt-nx8X9YLhiw1AfugRpC6u6w,
	bristot-H+wXaHxf7aLQT0dZR+AlfA,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
	kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg,
	kvm-u79uwXL29TY76Z2rM5mHXA, linux-kernel-u79uwXL29TY76Z2rM5mHXA,
	linux-acpi-u79uwXL29TY76Z2rM5mHXA,
	linux-efi-u79uwXL29TY76Z2rM5mHXA

On Tue, Mar 28, 2017 at 01:30:31PM -0600, Tyler Baicar wrote:
> A RAS (Reliability, Availability, Serviceability) controller
> may be a separate processor running in parallel with OS
> execution, and may generate error records for consumption by
> the OS. If the RAS controller produces multiple error records,
> then they may be overwritten before the OS has consumed them.
> 
> The Generic Hardware Error Source (GHES) v2 structure
> introduces the capability for the OS to acknowledge the
> consumption of the error record generated by the RAS
> controller. A RAS controller supporting GHESv2 shall wait for
> the acknowledgment before writing a new error record, thus
> eliminating the race condition.
> 
> Add support for parsing of GHESv2 sub-tables as well.
> 
> Signed-off-by: Tyler Baicar <tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> Reviewed-by: James Morse <james.morse-5wv7dgnIgG8@public.gmane.org>
> ---
>  drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
>  drivers/acpi/apei/hest.c |  7 +++++--
>  include/acpi/ghes.h      |  5 ++++-
>  3 files changed, 55 insertions(+), 6 deletions(-)

...

> @@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
>  	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
>  	if (!ghes)
>  		return ERR_PTR(-ENOMEM);
> +
>  	ghes->generic = generic;
> +	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
> +		rc = apei_map_generic_address(
> +			&ghes->generic_v2->read_ack_register);

Yeah, that linebreak just to keep the 80-cols rule makes the code ugly
and hard to read.

Please put that mapping and unmapping in wrappers called
map_gen_v2(ghes) and unmap_gen_v2(ghes) or so, so that you can call them
wherever needed. Thus should make the flow a bit more understandable
what's going on and you won't have to repeat the unmapping lines in
ghes_fini().

> @@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
>  	rcu_read_unlock();
>  }
>  
> +static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
> +{
> +	int rc;
> +	u64 val = 0;
> +
> +	rc = apei_read(&val, &generic_v2->read_ack_register);
> +	if (rc)
> +		return rc;
> +	val &= generic_v2->read_ack_preserve <<
> +		generic_v2->read_ack_register.bit_offset;
> +	val |= generic_v2->read_ack_write <<
> +		generic_v2->read_ack_register.bit_offset;

Yeah, let them stick out, it more readable this way. Line spacing is
helpful too:

...
        rc = apei_read(&val, &generic_v2->read_ack_register);
        if (rc)
                return rc;

        val &= generic_v2->read_ack_preserve << generic_v2->read_ack_register.bit_offset;
        val |= generic_v2->read_ack_write    << generic_v2->read_ack_register.bit_offset;

        return apei_write(val, &generic_v2->read_ack_register);
}

> +	rc = apei_write(val, &generic_v2->read_ack_register);
> +
> +	return rc;
> +}
> +
>  static int ghes_proc(struct ghes *ghes)
>  {
>  	int rc;
-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
@ 2017-04-11 17:15       ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-11 17:15 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, Mar 28, 2017 at 01:30:31PM -0600, Tyler Baicar wrote:
> A RAS (Reliability, Availability, Serviceability) controller
> may be a separate processor running in parallel with OS
> execution, and may generate error records for consumption by
> the OS. If the RAS controller produces multiple error records,
> then they may be overwritten before the OS has consumed them.
> 
> The Generic Hardware Error Source (GHES) v2 structure
> introduces the capability for the OS to acknowledge the
> consumption of the error record generated by the RAS
> controller. A RAS controller supporting GHESv2 shall wait for
> the acknowledgment before writing a new error record, thus
> eliminating the race condition.
> 
> Add support for parsing of GHESv2 sub-tables as well.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> ---
>  drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
>  drivers/acpi/apei/hest.c |  7 +++++--
>  include/acpi/ghes.h      |  5 ++++-
>  3 files changed, 55 insertions(+), 6 deletions(-)

...

> @@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
>  	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
>  	if (!ghes)
>  		return ERR_PTR(-ENOMEM);
> +
>  	ghes->generic = generic;
> +	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
> +		rc = apei_map_generic_address(
> +			&ghes->generic_v2->read_ack_register);

Yeah, that linebreak just to keep the 80-cols rule makes the code ugly
and hard to read.

Please put that mapping and unmapping in wrappers called
map_gen_v2(ghes) and unmap_gen_v2(ghes) or so, so that you can call them
wherever needed. Thus should make the flow a bit more understandable
what's going on and you won't have to repeat the unmapping lines in
ghes_fini().

> @@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
>  	rcu_read_unlock();
>  }
>  
> +static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
> +{
> +	int rc;
> +	u64 val = 0;
> +
> +	rc = apei_read(&val, &generic_v2->read_ack_register);
> +	if (rc)
> +		return rc;
> +	val &= generic_v2->read_ack_preserve <<
> +		generic_v2->read_ack_register.bit_offset;
> +	val |= generic_v2->read_ack_write <<
> +		generic_v2->read_ack_register.bit_offset;

Yeah, let them stick out, it more readable this way. Line spacing is
helpful too:

...
        rc = apei_read(&val, &generic_v2->read_ack_register);
        if (rc)
                return rc;

        val &= generic_v2->read_ack_preserve << generic_v2->read_ack_register.bit_offset;
        val |= generic_v2->read_ack_write    << generic_v2->read_ack_register.bit_offset;

        return apei_write(val, &generic_v2->read_ack_register);
}

> +	rc = apei_write(val, &generic_v2->read_ack_register);
> +
> +	return rc;
> +}
> +
>  static int ghes_proc(struct ghes *ghes)
>  {
>  	int rc;
-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  2017-03-28 19:30   ` Tyler Baicar
  (?)
  (?)
@ 2017-04-12 13:34     ` Borislav Petkov
  -1 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-12 13:34 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

> Subject: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1

Use a verb in your patch subjects: "Add support for ..." or so.

On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
> Currently when a RAS error is reported it is not timestamped.

What is a RAS error? You mean a hardware error?

> The ACPI 6.1 spec adds the timestamp field to the generic error
> data entry v3 structure. The timestamp of when the firmware
> generated the error is now being reported.

So what this patch does doesn't have a lot to to do with the Subject?
Please state what the patch does in the Subject.

Also, your commit message talks about adding timestamp but the patch
does more. You need to state that too and explain what this patch does
actually.

> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/acpi/apei/ghes.c    |  9 ++++---
>  drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
>  include/acpi/ghes.h         | 22 ++++++++++++++++
>  3 files changed, 77 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 0241e36..9ddbb93 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>  	int flags = -1;
>  	int sec_sev = ghes_severity(gdata->error_severity);
>  	struct cper_sec_mem_err *mem_err;
> -	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
> +
> +	mem_err = acpi_hest_generic_data_payload(gdata);
>  
>  	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
>  		return;
> @@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
>  		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>  				 CPER_SEC_PLATFORM_MEM)) {
>  			struct cper_sec_mem_err *mem_err;
> -			mem_err = (struct cper_sec_mem_err *)(gdata+1);
> +
> +			mem_err = acpi_hest_generic_data_payload(gdata);
>  			ghes_edac_report_mem_error(ghes, sev, mem_err);
>  
>  			arch_apei_report_mem_error(sev, mem_err);
> @@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
>  		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>  				      CPER_SEC_PCIE)) {
>  			struct cper_sec_pcie *pcie_err;
> -			pcie_err = (struct cper_sec_pcie *)(gdata+1);
> +
> +			pcie_err = acpi_hest_generic_data_payload(gdata);
>  			if (sev == GHES_SEV_RECOVERABLE &&
>  			    sec_sev == GHES_SEV_RECOVERABLE &&
>  			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index d425374..8fa4e23 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -32,6 +32,9 @@
>  #include <linux/acpi.h>
>  #include <linux/pci.h>
>  #include <linux/aer.h>
> +#include <linux/printk.h>
> +#include <linux/bcd.h>
> +#include <acpi/ghes.h>
>  
>  #define INDENT_SP	" "
>  
> @@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>  	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>  }
>  
> +static void cper_estatus_print_section_v300(const char *pfx,
> +	const struct acpi_hest_generic_data_v300 *gdata)

Yuck, acpi_hest_generic_data_v300. Can we make those struct names smaller pls?
And v300 is just silly.

And then align args at opening brace.

> +{
> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
> +
> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
> +		timestamp = (__u8 *)&(gdata->time_stamp);
> +		sec = bcd2bin(timestamp[0]);
> +		min = bcd2bin(timestamp[1]);
> +		hour = bcd2bin(timestamp[2]);
> +		day = bcd2bin(timestamp[4]);
> +		mon = bcd2bin(timestamp[5]);
> +		year = bcd2bin(timestamp[6]);
> +		century = bcd2bin(timestamp[7]);

Align those vertically on the = sign.

> +		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
> +			0x01 & *(timestamp + 3) ? "precise" : "",

Move that test in a separate if-statement - that printk is unreadable as
it is. Also, the test bit always comes second.

> 			century,
> +			year, mon, day, hour, min, sec);
> +	}
> +}
> +
>  static void cper_estatus_print_section(
> -	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
> +	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)

static void
cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
			   int sec_no)

looks much better.

>  {
>  	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>  	__u16 severity;
>  	char newpfx[64];
>  
> +	if (acpi_hest_generic_data_version(gdata) >= 3)

Jeez, that macro name is like a one-lined book!

Let's make that "hest_gdata_ver()" or something else shorter.

> +		cper_estatus_print_section_v300(pfx,
> +			(const struct acpi_hest_generic_data_v300 *)gdata);
> +
>  	severity = gdata->error_severity;
>  	printk("%s""Error %d, type: %s\n", pfx, sec_no,
>  	       cper_severity_str(severity));
> @@ -403,14 +430,18 @@ static void cper_estatus_print_section(
>  
>  	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>  	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
> -		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
> +		struct cper_sec_proc_generic *proc_err;
> +
> +		proc_err = acpi_hest_generic_data_payload(gdata);

This looks like an unrelated change. The payload function addition and the
conversion of the code to use it should be a separate patch. And shorten that
function name too pls.

>  		printk("%s""section_type: general processor error\n", newpfx);
>  		if (gdata->error_data_length >= sizeof(*proc_err))
>  			cper_print_proc_generic(newpfx, proc_err);
>  		else
>  			goto err_section_too_small;
>  	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
> -		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
> +		struct cper_sec_mem_err *mem_err;
> +
> +		mem_err = acpi_hest_generic_data_payload(gdata);
>  		printk("%s""section_type: memory error\n", newpfx);
>  		if (gdata->error_data_length >=
>  		    sizeof(struct cper_sec_mem_err_old))
> @@ -419,7 +450,9 @@ static void cper_estatus_print_section(
>  		else
>  			goto err_section_too_small;
>  	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
> -		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
> +		struct cper_sec_pcie *pcie;
> +
> +		pcie = acpi_hest_generic_data_payload(gdata);
>  		printk("%s""section_type: PCIe error\n", newpfx);
>  		if (gdata->error_data_length >= sizeof(*pcie))
>  			cper_print_pcie(newpfx, pcie, gdata);
> @@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
>  			const struct acpi_hest_generic_status *estatus)
>  {
>  	struct acpi_hest_generic_data *gdata;
> -	unsigned int data_len, gedata_len;
> +	unsigned int data_len;
>  	int sec_no = 0;
>  	char newpfx[64];
>  	__u16 severity;
> @@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
>  	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>  	data_len = estatus->data_length;
>  	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> +
>  	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
> -	while (data_len >= sizeof(*gdata)) {
> -		gedata_len = gdata->error_data_length;
> +
> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>  		cper_estatus_print_section(newpfx, gdata, sec_no);
> -		data_len -= gedata_len + sizeof(*gdata);
> -		gdata = (void *)(gdata + 1) + gedata_len;
> +		data_len -= acpi_hest_generic_data_record_size(gdata);
> +		gdata = acpi_hest_generic_data_next(gdata);
>  		sec_no++;
>  	}
>  }
> @@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>  		return rc;
>  	data_len = estatus->data_length;
>  	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> -	while (data_len >= sizeof(*gdata)) {
> -		gedata_len = gdata->error_data_length;
> -		if (gedata_len > data_len - sizeof(*gdata))
> +
> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
> +		gedata_len = acpi_hest_generic_data_error_length(gdata);
> +		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
>  			return -EINVAL;
> -		data_len -= gedata_len + sizeof(*gdata);
> -		gdata = (void *)(gdata + 1) + gedata_len;
> +		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
> +		gdata = acpi_hest_generic_data_next(gdata);
>  	}
>  	if (data_len)
>  		return -EINVAL;
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 68f088a..6ae318b 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -12,6 +12,18 @@
>  #define GHES_TO_CLEAR		0x0001
>  #define GHES_EXITING		0x0002
>  
> +#define acpi_hest_generic_data_error_length(gdata)	\
> +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
> +#define acpi_hest_generic_data_size(gdata)		\
> +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
> +	sizeof(struct acpi_hest_generic_data_v300) :	\
> +	sizeof(struct acpi_hest_generic_data))
> +#define acpi_hest_generic_data_record_size(gdata)	\
> +	(acpi_hest_generic_data_size(gdata) +		\
> +	acpi_hest_generic_data_error_length(gdata))
> +#define acpi_hest_generic_data_next(gdata)		\
> +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))

This is one unreadable pile of too long names with a clearly redundant
and too long prefix. Please shorten it all.

> +
>  struct ghes {
>  	union {
>  		struct acpi_hest_generic *generic;
> @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
>  {
>  }
>  #endif
> +
> +#define acpi_hest_generic_data_version(gdata)			\
> +	(gdata->revision >> 8)
> +
> +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)

Lemme try to shorten it:

static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
{
	if (hest_gdata_ver(d) >= 3)
		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
	else
		return d + 1;
}

Now this is much more readable IMO. You can actually see what's going
on. And you still know what the struct names are.

So let's drop all that unnecessary too long prefixing and make the
code readable. That cper thing needs a lot more scrubbing, of course,
but some other day.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-12 13:34     ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-12 13:34 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

> Subject: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1

Use a verb in your patch subjects: "Add support for ..." or so.

On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
> Currently when a RAS error is reported it is not timestamped.

What is a RAS error? You mean a hardware error?

> The ACPI 6.1 spec adds the timestamp field to the generic error
> data entry v3 structure. The timestamp of when the firmware
> generated the error is now being reported.

So what this patch does doesn't have a lot to to do with the Subject?
Please state what the patch does in the Subject.

Also, your commit message talks about adding timestamp but the patch
does more. You need to state that too and explain what this patch does
actually.

> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/acpi/apei/ghes.c    |  9 ++++---
>  drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
>  include/acpi/ghes.h         | 22 ++++++++++++++++
>  3 files changed, 77 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 0241e36..9ddbb93 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>  	int flags = -1;
>  	int sec_sev = ghes_severity(gdata->error_severity);
>  	struct cper_sec_mem_err *mem_err;
> -	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
> +
> +	mem_err = acpi_hest_generic_data_payload(gdata);
>  
>  	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
>  		return;
> @@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
>  		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>  				 CPER_SEC_PLATFORM_MEM)) {
>  			struct cper_sec_mem_err *mem_err;
> -			mem_err = (struct cper_sec_mem_err *)(gdata+1);
> +
> +			mem_err = acpi_hest_generic_data_payload(gdata);
>  			ghes_edac_report_mem_error(ghes, sev, mem_err);
>  
>  			arch_apei_report_mem_error(sev, mem_err);
> @@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
>  		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>  				      CPER_SEC_PCIE)) {
>  			struct cper_sec_pcie *pcie_err;
> -			pcie_err = (struct cper_sec_pcie *)(gdata+1);
> +
> +			pcie_err = acpi_hest_generic_data_payload(gdata);
>  			if (sev == GHES_SEV_RECOVERABLE &&
>  			    sec_sev == GHES_SEV_RECOVERABLE &&
>  			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index d425374..8fa4e23 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -32,6 +32,9 @@
>  #include <linux/acpi.h>
>  #include <linux/pci.h>
>  #include <linux/aer.h>
> +#include <linux/printk.h>
> +#include <linux/bcd.h>
> +#include <acpi/ghes.h>
>  
>  #define INDENT_SP	" "
>  
> @@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>  	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>  }
>  
> +static void cper_estatus_print_section_v300(const char *pfx,
> +	const struct acpi_hest_generic_data_v300 *gdata)

Yuck, acpi_hest_generic_data_v300. Can we make those struct names smaller pls?
And v300 is just silly.

And then align args at opening brace.

> +{
> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
> +
> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
> +		timestamp = (__u8 *)&(gdata->time_stamp);
> +		sec = bcd2bin(timestamp[0]);
> +		min = bcd2bin(timestamp[1]);
> +		hour = bcd2bin(timestamp[2]);
> +		day = bcd2bin(timestamp[4]);
> +		mon = bcd2bin(timestamp[5]);
> +		year = bcd2bin(timestamp[6]);
> +		century = bcd2bin(timestamp[7]);

Align those vertically on the = sign.

> +		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
> +			0x01 & *(timestamp + 3) ? "precise" : "",

Move that test in a separate if-statement - that printk is unreadable as
it is. Also, the test bit always comes second.

> 			century,
> +			year, mon, day, hour, min, sec);
> +	}
> +}
> +
>  static void cper_estatus_print_section(
> -	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
> +	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)

static void
cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
			   int sec_no)

looks much better.

>  {
>  	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>  	__u16 severity;
>  	char newpfx[64];
>  
> +	if (acpi_hest_generic_data_version(gdata) >= 3)

Jeez, that macro name is like a one-lined book!

Let's make that "hest_gdata_ver()" or something else shorter.

> +		cper_estatus_print_section_v300(pfx,
> +			(const struct acpi_hest_generic_data_v300 *)gdata);
> +
>  	severity = gdata->error_severity;
>  	printk("%s""Error %d, type: %s\n", pfx, sec_no,
>  	       cper_severity_str(severity));
> @@ -403,14 +430,18 @@ static void cper_estatus_print_section(
>  
>  	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>  	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
> -		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
> +		struct cper_sec_proc_generic *proc_err;
> +
> +		proc_err = acpi_hest_generic_data_payload(gdata);

This looks like an unrelated change. The payload function addition and the
conversion of the code to use it should be a separate patch. And shorten that
function name too pls.

>  		printk("%s""section_type: general processor error\n", newpfx);
>  		if (gdata->error_data_length >= sizeof(*proc_err))
>  			cper_print_proc_generic(newpfx, proc_err);
>  		else
>  			goto err_section_too_small;
>  	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
> -		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
> +		struct cper_sec_mem_err *mem_err;
> +
> +		mem_err = acpi_hest_generic_data_payload(gdata);
>  		printk("%s""section_type: memory error\n", newpfx);
>  		if (gdata->error_data_length >=
>  		    sizeof(struct cper_sec_mem_err_old))
> @@ -419,7 +450,9 @@ static void cper_estatus_print_section(
>  		else
>  			goto err_section_too_small;
>  	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
> -		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
> +		struct cper_sec_pcie *pcie;
> +
> +		pcie = acpi_hest_generic_data_payload(gdata);
>  		printk("%s""section_type: PCIe error\n", newpfx);
>  		if (gdata->error_data_length >= sizeof(*pcie))
>  			cper_print_pcie(newpfx, pcie, gdata);
> @@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
>  			const struct acpi_hest_generic_status *estatus)
>  {
>  	struct acpi_hest_generic_data *gdata;
> -	unsigned int data_len, gedata_len;
> +	unsigned int data_len;
>  	int sec_no = 0;
>  	char newpfx[64];
>  	__u16 severity;
> @@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
>  	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>  	data_len = estatus->data_length;
>  	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> +
>  	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
> -	while (data_len >= sizeof(*gdata)) {
> -		gedata_len = gdata->error_data_length;
> +
> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>  		cper_estatus_print_section(newpfx, gdata, sec_no);
> -		data_len -= gedata_len + sizeof(*gdata);
> -		gdata = (void *)(gdata + 1) + gedata_len;
> +		data_len -= acpi_hest_generic_data_record_size(gdata);
> +		gdata = acpi_hest_generic_data_next(gdata);
>  		sec_no++;
>  	}
>  }
> @@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>  		return rc;
>  	data_len = estatus->data_length;
>  	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> -	while (data_len >= sizeof(*gdata)) {
> -		gedata_len = gdata->error_data_length;
> -		if (gedata_len > data_len - sizeof(*gdata))
> +
> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
> +		gedata_len = acpi_hest_generic_data_error_length(gdata);
> +		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
>  			return -EINVAL;
> -		data_len -= gedata_len + sizeof(*gdata);
> -		gdata = (void *)(gdata + 1) + gedata_len;
> +		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
> +		gdata = acpi_hest_generic_data_next(gdata);
>  	}
>  	if (data_len)
>  		return -EINVAL;
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 68f088a..6ae318b 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -12,6 +12,18 @@
>  #define GHES_TO_CLEAR		0x0001
>  #define GHES_EXITING		0x0002
>  
> +#define acpi_hest_generic_data_error_length(gdata)	\
> +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
> +#define acpi_hest_generic_data_size(gdata)		\
> +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
> +	sizeof(struct acpi_hest_generic_data_v300) :	\
> +	sizeof(struct acpi_hest_generic_data))
> +#define acpi_hest_generic_data_record_size(gdata)	\
> +	(acpi_hest_generic_data_size(gdata) +		\
> +	acpi_hest_generic_data_error_length(gdata))
> +#define acpi_hest_generic_data_next(gdata)		\
> +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))

This is one unreadable pile of too long names with a clearly redundant
and too long prefix. Please shorten it all.

> +
>  struct ghes {
>  	union {
>  		struct acpi_hest_generic *generic;
> @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
>  {
>  }
>  #endif
> +
> +#define acpi_hest_generic_data_version(gdata)			\
> +	(gdata->revision >> 8)
> +
> +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)

Lemme try to shorten it:

static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
{
	if (hest_gdata_ver(d) >= 3)
		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
	else
		return d + 1;
}

Now this is much more readable IMO. You can actually see what's going
on. And you still know what the struct names are.

So let's drop all that unnecessary too long prefixing and make the
code readable. That cper thing needs a lot more scrubbing, of course,
but some other day.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-12 13:34     ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-12 13:34 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

> Subject: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1

Use a verb in your patch subjects: "Add support for ..." or so.

On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
> Currently when a RAS error is reported it is not timestamped.

What is a RAS error? You mean a hardware error?

> The ACPI 6.1 spec adds the timestamp field to the generic error
> data entry v3 structure. The timestamp of when the firmware
> generated the error is now being reported.

So what this patch does doesn't have a lot to to do with the Subject?
Please state what the patch does in the Subject.

Also, your commit message talks about adding timestamp but the patch
does more. You need to state that too and explain what this patch does
actually.

> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/acpi/apei/ghes.c    |  9 ++++---
>  drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
>  include/acpi/ghes.h         | 22 ++++++++++++++++
>  3 files changed, 77 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 0241e36..9ddbb93 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>  	int flags = -1;
>  	int sec_sev = ghes_severity(gdata->error_severity);
>  	struct cper_sec_mem_err *mem_err;
> -	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
> +
> +	mem_err = acpi_hest_generic_data_payload(gdata);
>  
>  	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
>  		return;
> @@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
>  		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>  				 CPER_SEC_PLATFORM_MEM)) {
>  			struct cper_sec_mem_err *mem_err;
> -			mem_err = (struct cper_sec_mem_err *)(gdata+1);
> +
> +			mem_err = acpi_hest_generic_data_payload(gdata);
>  			ghes_edac_report_mem_error(ghes, sev, mem_err);
>  
>  			arch_apei_report_mem_error(sev, mem_err);
> @@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
>  		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>  				      CPER_SEC_PCIE)) {
>  			struct cper_sec_pcie *pcie_err;
> -			pcie_err = (struct cper_sec_pcie *)(gdata+1);
> +
> +			pcie_err = acpi_hest_generic_data_payload(gdata);
>  			if (sev == GHES_SEV_RECOVERABLE &&
>  			    sec_sev == GHES_SEV_RECOVERABLE &&
>  			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index d425374..8fa4e23 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -32,6 +32,9 @@
>  #include <linux/acpi.h>
>  #include <linux/pci.h>
>  #include <linux/aer.h>
> +#include <linux/printk.h>
> +#include <linux/bcd.h>
> +#include <acpi/ghes.h>
>  
>  #define INDENT_SP	" "
>  
> @@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>  	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>  }
>  
> +static void cper_estatus_print_section_v300(const char *pfx,
> +	const struct acpi_hest_generic_data_v300 *gdata)

Yuck, acpi_hest_generic_data_v300. Can we make those struct names smaller pls?
And v300 is just silly.

And then align args at opening brace.

> +{
> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
> +
> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
> +		timestamp = (__u8 *)&(gdata->time_stamp);
> +		sec = bcd2bin(timestamp[0]);
> +		min = bcd2bin(timestamp[1]);
> +		hour = bcd2bin(timestamp[2]);
> +		day = bcd2bin(timestamp[4]);
> +		mon = bcd2bin(timestamp[5]);
> +		year = bcd2bin(timestamp[6]);
> +		century = bcd2bin(timestamp[7]);

Align those vertically on the = sign.

> +		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
> +			0x01 & *(timestamp + 3) ? "precise" : "",

Move that test in a separate if-statement - that printk is unreadable as
it is. Also, the test bit always comes second.

> 			century,
> +			year, mon, day, hour, min, sec);
> +	}
> +}
> +
>  static void cper_estatus_print_section(
> -	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
> +	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)

static void
cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
			   int sec_no)

looks much better.

>  {
>  	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>  	__u16 severity;
>  	char newpfx[64];
>  
> +	if (acpi_hest_generic_data_version(gdata) >= 3)

Jeez, that macro name is like a one-lined book!

Let's make that "hest_gdata_ver()" or something else shorter.

> +		cper_estatus_print_section_v300(pfx,
> +			(const struct acpi_hest_generic_data_v300 *)gdata);
> +
>  	severity = gdata->error_severity;
>  	printk("%s""Error %d, type: %s\n", pfx, sec_no,
>  	       cper_severity_str(severity));
> @@ -403,14 +430,18 @@ static void cper_estatus_print_section(
>  
>  	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>  	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
> -		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
> +		struct cper_sec_proc_generic *proc_err;
> +
> +		proc_err = acpi_hest_generic_data_payload(gdata);

This looks like an unrelated change. The payload function addition and the
conversion of the code to use it should be a separate patch. And shorten that
function name too pls.

>  		printk("%s""section_type: general processor error\n", newpfx);
>  		if (gdata->error_data_length >= sizeof(*proc_err))
>  			cper_print_proc_generic(newpfx, proc_err);
>  		else
>  			goto err_section_too_small;
>  	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
> -		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
> +		struct cper_sec_mem_err *mem_err;
> +
> +		mem_err = acpi_hest_generic_data_payload(gdata);
>  		printk("%s""section_type: memory error\n", newpfx);
>  		if (gdata->error_data_length >=
>  		    sizeof(struct cper_sec_mem_err_old))
> @@ -419,7 +450,9 @@ static void cper_estatus_print_section(
>  		else
>  			goto err_section_too_small;
>  	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
> -		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
> +		struct cper_sec_pcie *pcie;
> +
> +		pcie = acpi_hest_generic_data_payload(gdata);
>  		printk("%s""section_type: PCIe error\n", newpfx);
>  		if (gdata->error_data_length >= sizeof(*pcie))
>  			cper_print_pcie(newpfx, pcie, gdata);
> @@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
>  			const struct acpi_hest_generic_status *estatus)
>  {
>  	struct acpi_hest_generic_data *gdata;
> -	unsigned int data_len, gedata_len;
> +	unsigned int data_len;
>  	int sec_no = 0;
>  	char newpfx[64];
>  	__u16 severity;
> @@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
>  	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>  	data_len = estatus->data_length;
>  	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> +
>  	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
> -	while (data_len >= sizeof(*gdata)) {
> -		gedata_len = gdata->error_data_length;
> +
> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>  		cper_estatus_print_section(newpfx, gdata, sec_no);
> -		data_len -= gedata_len + sizeof(*gdata);
> -		gdata = (void *)(gdata + 1) + gedata_len;
> +		data_len -= acpi_hest_generic_data_record_size(gdata);
> +		gdata = acpi_hest_generic_data_next(gdata);
>  		sec_no++;
>  	}
>  }
> @@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>  		return rc;
>  	data_len = estatus->data_length;
>  	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> -	while (data_len >= sizeof(*gdata)) {
> -		gedata_len = gdata->error_data_length;
> -		if (gedata_len > data_len - sizeof(*gdata))
> +
> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
> +		gedata_len = acpi_hest_generic_data_error_length(gdata);
> +		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
>  			return -EINVAL;
> -		data_len -= gedata_len + sizeof(*gdata);
> -		gdata = (void *)(gdata + 1) + gedata_len;
> +		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
> +		gdata = acpi_hest_generic_data_next(gdata);
>  	}
>  	if (data_len)
>  		return -EINVAL;
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 68f088a..6ae318b 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -12,6 +12,18 @@
>  #define GHES_TO_CLEAR		0x0001
>  #define GHES_EXITING		0x0002
>  
> +#define acpi_hest_generic_data_error_length(gdata)	\
> +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
> +#define acpi_hest_generic_data_size(gdata)		\
> +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
> +	sizeof(struct acpi_hest_generic_data_v300) :	\
> +	sizeof(struct acpi_hest_generic_data))
> +#define acpi_hest_generic_data_record_size(gdata)	\
> +	(acpi_hest_generic_data_size(gdata) +		\
> +	acpi_hest_generic_data_error_length(gdata))
> +#define acpi_hest_generic_data_next(gdata)		\
> +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))

This is one unreadable pile of too long names with a clearly redundant
and too long prefix. Please shorten it all.

> +
>  struct ghes {
>  	union {
>  		struct acpi_hest_generic *generic;
> @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
>  {
>  }
>  #endif
> +
> +#define acpi_hest_generic_data_version(gdata)			\
> +	(gdata->revision >> 8)
> +
> +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)

Lemme try to shorten it:

static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
{
	if (hest_gdata_ver(d) >= 3)
		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
	else
		return d + 1;
}

Now this is much more readable IMO. You can actually see what's going
on. And you still know what the struct names are.

So let's drop all that unnecessary too long prefixing and make the
code readable. That cper thing needs a lot more scrubbing, of course,
but some other day.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-12 13:34     ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-12 13:34 UTC (permalink / raw)
  To: linux-arm-kernel

> Subject: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1

Use a verb in your patch subjects: "Add support for ..." or so.

On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
> Currently when a RAS error is reported it is not timestamped.

What is a RAS error? You mean a hardware error?

> The ACPI 6.1 spec adds the timestamp field to the generic error
> data entry v3 structure. The timestamp of when the firmware
> generated the error is now being reported.

So what this patch does doesn't have a lot to to do with the Subject?
Please state what the patch does in the Subject.

Also, your commit message talks about adding timestamp but the patch
does more. You need to state that too and explain what this patch does
actually.

> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/acpi/apei/ghes.c    |  9 ++++---
>  drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
>  include/acpi/ghes.h         | 22 ++++++++++++++++
>  3 files changed, 77 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 0241e36..9ddbb93 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>  	int flags = -1;
>  	int sec_sev = ghes_severity(gdata->error_severity);
>  	struct cper_sec_mem_err *mem_err;
> -	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
> +
> +	mem_err = acpi_hest_generic_data_payload(gdata);
>  
>  	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
>  		return;
> @@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
>  		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>  				 CPER_SEC_PLATFORM_MEM)) {
>  			struct cper_sec_mem_err *mem_err;
> -			mem_err = (struct cper_sec_mem_err *)(gdata+1);
> +
> +			mem_err = acpi_hest_generic_data_payload(gdata);
>  			ghes_edac_report_mem_error(ghes, sev, mem_err);
>  
>  			arch_apei_report_mem_error(sev, mem_err);
> @@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
>  		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>  				      CPER_SEC_PCIE)) {
>  			struct cper_sec_pcie *pcie_err;
> -			pcie_err = (struct cper_sec_pcie *)(gdata+1);
> +
> +			pcie_err = acpi_hest_generic_data_payload(gdata);
>  			if (sev == GHES_SEV_RECOVERABLE &&
>  			    sec_sev == GHES_SEV_RECOVERABLE &&
>  			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index d425374..8fa4e23 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -32,6 +32,9 @@
>  #include <linux/acpi.h>
>  #include <linux/pci.h>
>  #include <linux/aer.h>
> +#include <linux/printk.h>
> +#include <linux/bcd.h>
> +#include <acpi/ghes.h>
>  
>  #define INDENT_SP	" "
>  
> @@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>  	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>  }
>  
> +static void cper_estatus_print_section_v300(const char *pfx,
> +	const struct acpi_hest_generic_data_v300 *gdata)

Yuck, acpi_hest_generic_data_v300. Can we make those struct names smaller pls?
And v300 is just silly.

And then align args at opening brace.

> +{
> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
> +
> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
> +		timestamp = (__u8 *)&(gdata->time_stamp);
> +		sec = bcd2bin(timestamp[0]);
> +		min = bcd2bin(timestamp[1]);
> +		hour = bcd2bin(timestamp[2]);
> +		day = bcd2bin(timestamp[4]);
> +		mon = bcd2bin(timestamp[5]);
> +		year = bcd2bin(timestamp[6]);
> +		century = bcd2bin(timestamp[7]);

Align those vertically on the = sign.

> +		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
> +			0x01 & *(timestamp + 3) ? "precise" : "",

Move that test in a separate if-statement - that printk is unreadable as
it is. Also, the test bit always comes second.

> 			century,
> +			year, mon, day, hour, min, sec);
> +	}
> +}
> +
>  static void cper_estatus_print_section(
> -	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
> +	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)

static void
cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
			   int sec_no)

looks much better.

>  {
>  	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>  	__u16 severity;
>  	char newpfx[64];
>  
> +	if (acpi_hest_generic_data_version(gdata) >= 3)

Jeez, that macro name is like a one-lined book!

Let's make that "hest_gdata_ver()" or something else shorter.

> +		cper_estatus_print_section_v300(pfx,
> +			(const struct acpi_hest_generic_data_v300 *)gdata);
> +
>  	severity = gdata->error_severity;
>  	printk("%s""Error %d, type: %s\n", pfx, sec_no,
>  	       cper_severity_str(severity));
> @@ -403,14 +430,18 @@ static void cper_estatus_print_section(
>  
>  	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>  	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
> -		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
> +		struct cper_sec_proc_generic *proc_err;
> +
> +		proc_err = acpi_hest_generic_data_payload(gdata);

This looks like an unrelated change. The payload function addition and the
conversion of the code to use it should be a separate patch. And shorten that
function name too pls.

>  		printk("%s""section_type: general processor error\n", newpfx);
>  		if (gdata->error_data_length >= sizeof(*proc_err))
>  			cper_print_proc_generic(newpfx, proc_err);
>  		else
>  			goto err_section_too_small;
>  	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
> -		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
> +		struct cper_sec_mem_err *mem_err;
> +
> +		mem_err = acpi_hest_generic_data_payload(gdata);
>  		printk("%s""section_type: memory error\n", newpfx);
>  		if (gdata->error_data_length >=
>  		    sizeof(struct cper_sec_mem_err_old))
> @@ -419,7 +450,9 @@ static void cper_estatus_print_section(
>  		else
>  			goto err_section_too_small;
>  	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
> -		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
> +		struct cper_sec_pcie *pcie;
> +
> +		pcie = acpi_hest_generic_data_payload(gdata);
>  		printk("%s""section_type: PCIe error\n", newpfx);
>  		if (gdata->error_data_length >= sizeof(*pcie))
>  			cper_print_pcie(newpfx, pcie, gdata);
> @@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
>  			const struct acpi_hest_generic_status *estatus)
>  {
>  	struct acpi_hest_generic_data *gdata;
> -	unsigned int data_len, gedata_len;
> +	unsigned int data_len;
>  	int sec_no = 0;
>  	char newpfx[64];
>  	__u16 severity;
> @@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
>  	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>  	data_len = estatus->data_length;
>  	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> +
>  	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
> -	while (data_len >= sizeof(*gdata)) {
> -		gedata_len = gdata->error_data_length;
> +
> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>  		cper_estatus_print_section(newpfx, gdata, sec_no);
> -		data_len -= gedata_len + sizeof(*gdata);
> -		gdata = (void *)(gdata + 1) + gedata_len;
> +		data_len -= acpi_hest_generic_data_record_size(gdata);
> +		gdata = acpi_hest_generic_data_next(gdata);
>  		sec_no++;
>  	}
>  }
> @@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>  		return rc;
>  	data_len = estatus->data_length;
>  	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
> -	while (data_len >= sizeof(*gdata)) {
> -		gedata_len = gdata->error_data_length;
> -		if (gedata_len > data_len - sizeof(*gdata))
> +
> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
> +		gedata_len = acpi_hest_generic_data_error_length(gdata);
> +		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
>  			return -EINVAL;
> -		data_len -= gedata_len + sizeof(*gdata);
> -		gdata = (void *)(gdata + 1) + gedata_len;
> +		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
> +		gdata = acpi_hest_generic_data_next(gdata);
>  	}
>  	if (data_len)
>  		return -EINVAL;
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 68f088a..6ae318b 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -12,6 +12,18 @@
>  #define GHES_TO_CLEAR		0x0001
>  #define GHES_EXITING		0x0002
>  
> +#define acpi_hest_generic_data_error_length(gdata)	\
> +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
> +#define acpi_hest_generic_data_size(gdata)		\
> +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
> +	sizeof(struct acpi_hest_generic_data_v300) :	\
> +	sizeof(struct acpi_hest_generic_data))
> +#define acpi_hest_generic_data_record_size(gdata)	\
> +	(acpi_hest_generic_data_size(gdata) +		\
> +	acpi_hest_generic_data_error_length(gdata))
> +#define acpi_hest_generic_data_next(gdata)		\
> +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))

This is one unreadable pile of too long names with a clearly redundant
and too long prefix. Please shorten it all.

> +
>  struct ghes {
>  	union {
>  		struct acpi_hest_generic *generic;
> @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
>  {
>  }
>  #endif
> +
> +#define acpi_hest_generic_data_version(gdata)			\
> +	(gdata->revision >> 8)
> +
> +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)

Lemme try to shorten it:

static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
{
	if (hest_gdata_ver(d) >= 3)
		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
	else
		return d + 1;
}

Now this is much more readable IMO. You can actually see what's going
on. And you still know what the struct names are.

So let's drop all that unnecessary too long prefixing and make the
code readable. That cper thing needs a lot more scrubbing, of course,
but some other day.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  2017-04-12 13:34     ` Borislav Petkov
  (?)
@ 2017-04-12 16:40       ` Joe Perches
  -1 siblings, 0 replies; 80+ messages in thread
From: Joe Perches @ 2017-04-12 16:40 UTC (permalink / raw)
  To: Borislav Petkov, Tyler Baicar
  Cc: linux-efi, kvm, matt, catalin.marinas, will.deacon, robert.moore,
	paul.gortmaker, lv.zheng, kvmarm, fu.wei, zjzhang, linux,
	gengdongjiu, linux-acpi, eun.taik.lee, shijie.huang, labbott,
	lenb, harba, john.garry, marc.zyngier, punit.agrawal, rostedt,
	nkaje, sandeepa.s.prabhu, linux-arm-kernel, devel, rjw, rruigrok,
	linux-kernel, astone, hanjun.guo, pbonzini, akpm, bristot,
	shiju.jose

On Wed, 2017-04-12 at 15:34 +0200, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
> > Currently when a RAS error is reported it is not timestamped.
[]
> > diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
[]
> > +#define acpi_hest_generic_data_error_length(gdata)	\
> > +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
> > +#define acpi_hest_generic_data_size(gdata)		\
> > +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
> > +	sizeof(struct acpi_hest_generic_data_v300) :	\
> > +	sizeof(struct acpi_hest_generic_data))
> > +#define acpi_hest_generic_data_record_size(gdata)	\
> > +	(acpi_hest_generic_data_size(gdata) +		\
> > +	acpi_hest_generic_data_error_length(gdata))
> > +#define acpi_hest_generic_data_next(gdata)		\
> > +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
> 
> This is one unreadable pile of too long names with a clearly redundant
> and too long prefix. Please shorten it all.

Naming is generally author's choice and internal
consistency has value too.

acpi_hest_generic<foo> is already used throughout this codebase
in multiple files and paths.

> > @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
> >  {
> >  }
> >  #endif
> > +
> > +#define acpi_hest_generic_data_version(gdata)			\
> > +	(gdata->revision >> 8)
> > +
> > +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
> 
> Lemme try to shorten it:
> 
> static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
> {
> 	if (hest_gdata_ver(d) >= 3)
> 		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
> 	else
> 		return d + 1;
> }
> 
> Now this is much more readable IMO. You can actually see what's going
> on. And you still know what the struct names are.

trivial: unnecessary cast to void *

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-12 16:40       ` Joe Perches
  0 siblings, 0 replies; 80+ messages in thread
From: Joe Perches @ 2017-04-12 16:40 UTC (permalink / raw)
  To: Borislav Petkov, Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, gengdongjiu, xiexiuqi

On Wed, 2017-04-12 at 15:34 +0200, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
> > Currently when a RAS error is reported it is not timestamped.
[]
> > diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
[]
> > +#define acpi_hest_generic_data_error_length(gdata)	\
> > +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
> > +#define acpi_hest_generic_data_size(gdata)		\
> > +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
> > +	sizeof(struct acpi_hest_generic_data_v300) :	\
> > +	sizeof(struct acpi_hest_generic_data))
> > +#define acpi_hest_generic_data_record_size(gdata)	\
> > +	(acpi_hest_generic_data_size(gdata) +		\
> > +	acpi_hest_generic_data_error_length(gdata))
> > +#define acpi_hest_generic_data_next(gdata)		\
> > +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
> 
> This is one unreadable pile of too long names with a clearly redundant
> and too long prefix. Please shorten it all.

Naming is generally author's choice and internal
consistency has value too.

acpi_hest_generic<foo> is already used throughout this codebase
in multiple files and paths.

> > @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
> >  {
> >  }
> >  #endif
> > +
> > +#define acpi_hest_generic_data_version(gdata)			\
> > +	(gdata->revision >> 8)
> > +
> > +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
> 
> Lemme try to shorten it:
> 
> static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
> {
> 	if (hest_gdata_ver(d) >= 3)
> 		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
> 	else
> 		return d + 1;
> }
> 
> Now this is much more readable IMO. You can actually see what's going
> on. And you still know what the struct names are.

trivial: unnecessary cast to void *

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-12 16:40       ` Joe Perches
  0 siblings, 0 replies; 80+ messages in thread
From: Joe Perches @ 2017-04-12 16:40 UTC (permalink / raw)
  To: linux-arm-kernel

On Wed, 2017-04-12 at 15:34 +0200, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
> > Currently when a RAS error is reported it is not timestamped.
[]
> > diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
[]
> > +#define acpi_hest_generic_data_error_length(gdata)	\
> > +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
> > +#define acpi_hest_generic_data_size(gdata)		\
> > +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
> > +	sizeof(struct acpi_hest_generic_data_v300) :	\
> > +	sizeof(struct acpi_hest_generic_data))
> > +#define acpi_hest_generic_data_record_size(gdata)	\
> > +	(acpi_hest_generic_data_size(gdata) +		\
> > +	acpi_hest_generic_data_error_length(gdata))
> > +#define acpi_hest_generic_data_next(gdata)		\
> > +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
> 
> This is one unreadable pile of too long names with a clearly redundant
> and too long prefix. Please shorten it all.

Naming is generally author's choice and internal
consistency has value too.

acpi_hest_generic<foo> is already used throughout this codebase
in multiple files and paths.

> > @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
> >  {
> >  }
> >  #endif
> > +
> > +#define acpi_hest_generic_data_version(gdata)			\
> > +	(gdata->revision >> 8)
> > +
> > +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
> 
> Lemme try to shorten it:
> 
> static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
> {
> 	if (hest_gdata_ver(d) >= 3)
> 		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
> 	else
> 		return d + 1;
> }
> 
> Now this is much more readable IMO. You can actually see what's going
> on. And you still know what the struct names are.

trivial: unnecessary cast to void *

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 03/10] efi: parse ARM processor error
  2017-03-28 19:30   ` Tyler Baicar
  (?)
  (?)
@ 2017-04-12 16:51     ` Borislav Petkov
  -1 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-12 16:51 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

On Tue, Mar 28, 2017 at 01:30:33PM -0600, Tyler Baicar wrote:
> Add support for ARM Common Platform Error Record (CPER).
> UEFI 2.6 specification adds support for ARM specific
> processor error information to be reported as part of the
> CPER records. This provides more detail on for processor error logs.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/cper.h        |  54 ++++++++++++++++++
>  2 files changed, 187 insertions(+)
> 
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 8fa4e23..56aa516 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>  static const char * const proc_type_strs[] = {
>  	"IA32/X64",
>  	"IA64",
> +	"ARM",
>  };
>  
>  static const char * const proc_isa_strs[] = {
>  	"IA32",
>  	"IA64",
>  	"X64",
> +	"ARM A32/T32",
> +	"ARM A64",
>  };
>  
>  static const char * const proc_error_type_strs[] = {
> @@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>  	"corrected",
>  };
>  
> +static const char * const arm_reg_ctx_strs[] = {
> +	"AArch32 general purpose registers",
> +	"AArch32 EL1 context registers",
> +	"AArch32 EL2 context registers",
> +	"AArch32 secure context registers",
> +	"AArch64 general purpose registers",
> +	"AArch64 EL1 context registers",
> +	"AArch64 EL2 context registers",
> +	"AArch64 EL3 context registers",
> +	"Misc. system register structure",
> +};

That...

> +
>  static void cper_print_proc_generic(const char *pfx,
>  				    const struct cper_sec_proc_generic *proc)
>  {
> @@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
>  		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
>  }
>  
> +static void cper_print_proc_arm(const char *pfx,
> +				const struct cper_sec_proc_arm *proc)

... and that function should go into:

#if defined(CONFIG_ARM64) || defined(CONFIG_ARM)

Just put them close together so that you don't have too much ifdeffery.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 03/10] efi: parse ARM processor error
@ 2017-04-12 16:51     ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-12 16:51 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On Tue, Mar 28, 2017 at 01:30:33PM -0600, Tyler Baicar wrote:
> Add support for ARM Common Platform Error Record (CPER).
> UEFI 2.6 specification adds support for ARM specific
> processor error information to be reported as part of the
> CPER records. This provides more detail on for processor error logs.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/cper.h        |  54 ++++++++++++++++++
>  2 files changed, 187 insertions(+)
> 
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 8fa4e23..56aa516 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>  static const char * const proc_type_strs[] = {
>  	"IA32/X64",
>  	"IA64",
> +	"ARM",
>  };
>  
>  static const char * const proc_isa_strs[] = {
>  	"IA32",
>  	"IA64",
>  	"X64",
> +	"ARM A32/T32",
> +	"ARM A64",
>  };
>  
>  static const char * const proc_error_type_strs[] = {
> @@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>  	"corrected",
>  };
>  
> +static const char * const arm_reg_ctx_strs[] = {
> +	"AArch32 general purpose registers",
> +	"AArch32 EL1 context registers",
> +	"AArch32 EL2 context registers",
> +	"AArch32 secure context registers",
> +	"AArch64 general purpose registers",
> +	"AArch64 EL1 context registers",
> +	"AArch64 EL2 context registers",
> +	"AArch64 EL3 context registers",
> +	"Misc. system register structure",
> +};

That...

> +
>  static void cper_print_proc_generic(const char *pfx,
>  				    const struct cper_sec_proc_generic *proc)
>  {
> @@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
>  		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
>  }
>  
> +static void cper_print_proc_arm(const char *pfx,
> +				const struct cper_sec_proc_arm *proc)

... and that function should go into:

#if defined(CONFIG_ARM64) || defined(CONFIG_ARM)

Just put them close together so that you don't have too much ifdeffery.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 03/10] efi: parse ARM processor error
@ 2017-04-12 16:51     ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-12 16:51 UTC (permalink / raw)
  To: Tyler Baicar
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

On Tue, Mar 28, 2017 at 01:30:33PM -0600, Tyler Baicar wrote:
> Add support for ARM Common Platform Error Record (CPER).
> UEFI 2.6 specification adds support for ARM specific
> processor error information to be reported as part of the
> CPER records. This provides more detail on for processor error logs.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/cper.h        |  54 ++++++++++++++++++
>  2 files changed, 187 insertions(+)
> 
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 8fa4e23..56aa516 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>  static const char * const proc_type_strs[] = {
>  	"IA32/X64",
>  	"IA64",
> +	"ARM",
>  };
>  
>  static const char * const proc_isa_strs[] = {
>  	"IA32",
>  	"IA64",
>  	"X64",
> +	"ARM A32/T32",
> +	"ARM A64",
>  };
>  
>  static const char * const proc_error_type_strs[] = {
> @@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>  	"corrected",
>  };
>  
> +static const char * const arm_reg_ctx_strs[] = {
> +	"AArch32 general purpose registers",
> +	"AArch32 EL1 context registers",
> +	"AArch32 EL2 context registers",
> +	"AArch32 secure context registers",
> +	"AArch64 general purpose registers",
> +	"AArch64 EL1 context registers",
> +	"AArch64 EL2 context registers",
> +	"AArch64 EL3 context registers",
> +	"Misc. system register structure",
> +};

That...

> +
>  static void cper_print_proc_generic(const char *pfx,
>  				    const struct cper_sec_proc_generic *proc)
>  {
> @@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
>  		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
>  }
>  
> +static void cper_print_proc_arm(const char *pfx,
> +				const struct cper_sec_proc_arm *proc)

... and that function should go into:

#if defined(CONFIG_ARM64) || defined(CONFIG_ARM)

Just put them close together so that you don't have too much ifdeffery.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 03/10] efi: parse ARM processor error
@ 2017-04-12 16:51     ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-12 16:51 UTC (permalink / raw)
  To: linux-arm-kernel

On Tue, Mar 28, 2017 at 01:30:33PM -0600, Tyler Baicar wrote:
> Add support for ARM Common Platform Error Record (CPER).
> UEFI 2.6 specification adds support for ARM specific
> processor error information to be reported as part of the
> CPER records. This provides more detail on for processor error logs.
> 
> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Reviewed-by: James Morse <james.morse@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>  drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/cper.h        |  54 ++++++++++++++++++
>  2 files changed, 187 insertions(+)
> 
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 8fa4e23..56aa516 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>  static const char * const proc_type_strs[] = {
>  	"IA32/X64",
>  	"IA64",
> +	"ARM",
>  };
>  
>  static const char * const proc_isa_strs[] = {
>  	"IA32",
>  	"IA64",
>  	"X64",
> +	"ARM A32/T32",
> +	"ARM A64",
>  };
>  
>  static const char * const proc_error_type_strs[] = {
> @@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>  	"corrected",
>  };
>  
> +static const char * const arm_reg_ctx_strs[] = {
> +	"AArch32 general purpose registers",
> +	"AArch32 EL1 context registers",
> +	"AArch32 EL2 context registers",
> +	"AArch32 secure context registers",
> +	"AArch64 general purpose registers",
> +	"AArch64 EL1 context registers",
> +	"AArch64 EL2 context registers",
> +	"AArch64 EL3 context registers",
> +	"Misc. system register structure",
> +};

That...

> +
>  static void cper_print_proc_generic(const char *pfx,
>  				    const struct cper_sec_proc_generic *proc)
>  {
> @@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
>  		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
>  }
>  
> +static void cper_print_proc_arm(const char *pfx,
> +				const struct cper_sec_proc_arm *proc)

... and that function should go into:

#if defined(CONFIG_ARM64) || defined(CONFIG_ARM)

Just put them close together so that you don't have too much ifdeffery.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
  2017-04-11 17:15       ` Borislav Petkov
  (?)
  (?)
@ 2017-04-13 19:45         ` Baicar, Tyler
  -1 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 19:45 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

On 4/11/2017 11:15 AM, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:31PM -0600, Tyler Baicar wrote:
>> A RAS (Reliability, Availability, Serviceability) controller
>> may be a separate processor running in parallel with OS
>> execution, and may generate error records for consumption by
>> the OS. If the RAS controller produces multiple error records,
>> then they may be overwritten before the OS has consumed them.
>>
>> The Generic Hardware Error Source (GHES) v2 structure
>> introduces the capability for the OS to acknowledge the
>> consumption of the error record generated by the RAS
>> controller. A RAS controller supporting GHESv2 shall wait for
>> the acknowledgment before writing a new error record, thus
>> eliminating the race condition.
>>
>> Add support for parsing of GHESv2 sub-tables as well.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> ---
>>   drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
>>   drivers/acpi/apei/hest.c |  7 +++++--
>>   include/acpi/ghes.h      |  5 ++++-
>>   3 files changed, 55 insertions(+), 6 deletions(-)
> ...
>
>> @@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
>>   	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
>>   	if (!ghes)
>>   		return ERR_PTR(-ENOMEM);
>> +
>>   	ghes->generic = generic;
>> +	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
>> +		rc = apei_map_generic_address(
>> +			&ghes->generic_v2->read_ack_register);
> Yeah, that linebreak just to keep the 80-cols rule makes the code ugly
> and hard to read.
>
> Please put that mapping and unmapping in wrappers called
> map_gen_v2(ghes) and unmap_gen_v2(ghes) or so, so that you can call them
> wherever needed. Thus should make the flow a bit more understandable
> what's going on and you won't have to repeat the unmapping lines in
> ghes_fini().
Hello Boris,

Thank you for the feedback. I will make this change in the next version.
>> @@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
>>   	rcu_read_unlock();
>>   }
>>   
>> +static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
>> +{
>> +	int rc;
>> +	u64 val = 0;
>> +
>> +	rc = apei_read(&val, &generic_v2->read_ack_register);
>> +	if (rc)
>> +		return rc;
>> +	val &= generic_v2->read_ack_preserve <<
>> +		generic_v2->read_ack_register.bit_offset;
>> +	val |= generic_v2->read_ack_write <<
>> +		generic_v2->read_ack_register.bit_offset;
> Yeah, let them stick out, it more readable this way. Line spacing is
> helpful too:
>
> ...
>          rc = apei_read(&val, &generic_v2->read_ack_register);
>          if (rc)
>                  return rc;
>
>          val &= generic_v2->read_ack_preserve << generic_v2->read_ack_register.bit_offset;
>          val |= generic_v2->read_ack_write    << generic_v2->read_ack_register.bit_offset;
>
>          return apei_write(val, &generic_v2->read_ack_register);
> }
I will make this change in the next version.

Thanks,
Tyler
>> +	rc = apei_write(val, &generic_v2->read_ack_register);
>> +
>> +	return rc;
>> +}
>> +
>>   static int ghes_proc(struct ghes *ghes)
>>   {
>>   	int rc;

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.


^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
@ 2017-04-13 19:45         ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 19:45 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On 4/11/2017 11:15 AM, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:31PM -0600, Tyler Baicar wrote:
>> A RAS (Reliability, Availability, Serviceability) controller
>> may be a separate processor running in parallel with OS
>> execution, and may generate error records for consumption by
>> the OS. If the RAS controller produces multiple error records,
>> then they may be overwritten before the OS has consumed them.
>>
>> The Generic Hardware Error Source (GHES) v2 structure
>> introduces the capability for the OS to acknowledge the
>> consumption of the error record generated by the RAS
>> controller. A RAS controller supporting GHESv2 shall wait for
>> the acknowledgment before writing a new error record, thus
>> eliminating the race condition.
>>
>> Add support for parsing of GHESv2 sub-tables as well.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> ---
>>   drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
>>   drivers/acpi/apei/hest.c |  7 +++++--
>>   include/acpi/ghes.h      |  5 ++++-
>>   3 files changed, 55 insertions(+), 6 deletions(-)
> ...
>
>> @@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
>>   	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
>>   	if (!ghes)
>>   		return ERR_PTR(-ENOMEM);
>> +
>>   	ghes->generic = generic;
>> +	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
>> +		rc = apei_map_generic_address(
>> +			&ghes->generic_v2->read_ack_register);
> Yeah, that linebreak just to keep the 80-cols rule makes the code ugly
> and hard to read.
>
> Please put that mapping and unmapping in wrappers called
> map_gen_v2(ghes) and unmap_gen_v2(ghes) or so, so that you can call them
> wherever needed. Thus should make the flow a bit more understandable
> what's going on and you won't have to repeat the unmapping lines in
> ghes_fini().
Hello Boris,

Thank you for the feedback. I will make this change in the next version.
>> @@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
>>   	rcu_read_unlock();
>>   }
>>   
>> +static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
>> +{
>> +	int rc;
>> +	u64 val = 0;
>> +
>> +	rc = apei_read(&val, &generic_v2->read_ack_register);
>> +	if (rc)
>> +		return rc;
>> +	val &= generic_v2->read_ack_preserve <<
>> +		generic_v2->read_ack_register.bit_offset;
>> +	val |= generic_v2->read_ack_write <<
>> +		generic_v2->read_ack_register.bit_offset;
> Yeah, let them stick out, it more readable this way. Line spacing is
> helpful too:
>
> ...
>          rc = apei_read(&val, &generic_v2->read_ack_register);
>          if (rc)
>                  return rc;
>
>          val &= generic_v2->read_ack_preserve << generic_v2->read_ack_register.bit_offset;
>          val |= generic_v2->read_ack_write    << generic_v2->read_ack_register.bit_offset;
>
>          return apei_write(val, &generic_v2->read_ack_register);
> }
I will make this change in the next version.

Thanks,
Tyler
>> +	rc = apei_write(val, &generic_v2->read_ack_register);
>> +
>> +	return rc;
>> +}
>> +
>>   static int ghes_proc(struct ghes *ghes)
>>   {
>>   	int rc;

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
@ 2017-04-13 19:45         ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 19:45 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

On 4/11/2017 11:15 AM, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:31PM -0600, Tyler Baicar wrote:
>> A RAS (Reliability, Availability, Serviceability) controller
>> may be a separate processor running in parallel with OS
>> execution, and may generate error records for consumption by
>> the OS. If the RAS controller produces multiple error records,
>> then they may be overwritten before the OS has consumed them.
>>
>> The Generic Hardware Error Source (GHES) v2 structure
>> introduces the capability for the OS to acknowledge the
>> consumption of the error record generated by the RAS
>> controller. A RAS controller supporting GHESv2 shall wait for
>> the acknowledgment before writing a new error record, thus
>> eliminating the race condition.
>>
>> Add support for parsing of GHESv2 sub-tables as well.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> ---
>>   drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
>>   drivers/acpi/apei/hest.c |  7 +++++--
>>   include/acpi/ghes.h      |  5 ++++-
>>   3 files changed, 55 insertions(+), 6 deletions(-)
> ...
>
>> @@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
>>   	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
>>   	if (!ghes)
>>   		return ERR_PTR(-ENOMEM);
>> +
>>   	ghes->generic = generic;
>> +	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
>> +		rc = apei_map_generic_address(
>> +			&ghes->generic_v2->read_ack_register);
> Yeah, that linebreak just to keep the 80-cols rule makes the code ugly
> and hard to read.
>
> Please put that mapping and unmapping in wrappers called
> map_gen_v2(ghes) and unmap_gen_v2(ghes) or so, so that you can call them
> wherever needed. Thus should make the flow a bit more understandable
> what's going on and you won't have to repeat the unmapping lines in
> ghes_fini().
Hello Boris,

Thank you for the feedback. I will make this change in the next version.
>> @@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
>>   	rcu_read_unlock();
>>   }
>>   
>> +static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
>> +{
>> +	int rc;
>> +	u64 val = 0;
>> +
>> +	rc = apei_read(&val, &generic_v2->read_ack_register);
>> +	if (rc)
>> +		return rc;
>> +	val &= generic_v2->read_ack_preserve <<
>> +		generic_v2->read_ack_register.bit_offset;
>> +	val |= generic_v2->read_ack_write <<
>> +		generic_v2->read_ack_register.bit_offset;
> Yeah, let them stick out, it more readable this way. Line spacing is
> helpful too:
>
> ...
>          rc = apei_read(&val, &generic_v2->read_ack_register);
>          if (rc)
>                  return rc;
>
>          val &= generic_v2->read_ack_preserve << generic_v2->read_ack_register.bit_offset;
>          val |= generic_v2->read_ack_write    << generic_v2->read_ack_register.bit_offset;
>
>          return apei_write(val, &generic_v2->read_ack_register);
> }
I will make this change in the next version.

Thanks,
Tyler
>> +	rc = apei_write(val, &generic_v2->read_ack_register);
>> +
>> +	return rc;
>> +}
>> +
>>   static int ghes_proc(struct ghes *ghes)
>>   {
>>   	int rc;

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.


^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption
@ 2017-04-13 19:45         ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 19:45 UTC (permalink / raw)
  To: linux-arm-kernel

On 4/11/2017 11:15 AM, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:31PM -0600, Tyler Baicar wrote:
>> A RAS (Reliability, Availability, Serviceability) controller
>> may be a separate processor running in parallel with OS
>> execution, and may generate error records for consumption by
>> the OS. If the RAS controller produces multiple error records,
>> then they may be overwritten before the OS has consumed them.
>>
>> The Generic Hardware Error Source (GHES) v2 structure
>> introduces the capability for the OS to acknowledge the
>> consumption of the error record generated by the RAS
>> controller. A RAS controller supporting GHESv2 shall wait for
>> the acknowledgment before writing a new error record, thus
>> eliminating the race condition.
>>
>> Add support for parsing of GHESv2 sub-tables as well.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> ---
>>   drivers/acpi/apei/ghes.c | 49 +++++++++++++++++++++++++++++++++++++++++++++---
>>   drivers/acpi/apei/hest.c |  7 +++++--
>>   include/acpi/ghes.h      |  5 ++++-
>>   3 files changed, 55 insertions(+), 6 deletions(-)
> ...
>
>> @@ -249,10 +254,18 @@ static struct ghes *ghes_new(struct acpi_hest_generic *generic)
>>   	ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
>>   	if (!ghes)
>>   		return ERR_PTR(-ENOMEM);
>> +
>>   	ghes->generic = generic;
>> +	if (IS_HEST_TYPE_GENERIC_V2(ghes)) {
>> +		rc = apei_map_generic_address(
>> +			&ghes->generic_v2->read_ack_register);
> Yeah, that linebreak just to keep the 80-cols rule makes the code ugly
> and hard to read.
>
> Please put that mapping and unmapping in wrappers called
> map_gen_v2(ghes) and unmap_gen_v2(ghes) or so, so that you can call them
> wherever needed. Thus should make the flow a bit more understandable
> what's going on and you won't have to repeat the unmapping lines in
> ghes_fini().
Hello Boris,

Thank you for the feedback. I will make this change in the next version.
>> @@ -649,6 +669,23 @@ static void ghes_estatus_cache_add(
>>   	rcu_read_unlock();
>>   }
>>   
>> +static int ghes_ack_error(struct acpi_hest_generic_v2 *generic_v2)
>> +{
>> +	int rc;
>> +	u64 val = 0;
>> +
>> +	rc = apei_read(&val, &generic_v2->read_ack_register);
>> +	if (rc)
>> +		return rc;
>> +	val &= generic_v2->read_ack_preserve <<
>> +		generic_v2->read_ack_register.bit_offset;
>> +	val |= generic_v2->read_ack_write <<
>> +		generic_v2->read_ack_register.bit_offset;
> Yeah, let them stick out, it more readable this way. Line spacing is
> helpful too:
>
> ...
>          rc = apei_read(&val, &generic_v2->read_ack_register);
>          if (rc)
>                  return rc;
>
>          val &= generic_v2->read_ack_preserve << generic_v2->read_ack_register.bit_offset;
>          val |= generic_v2->read_ack_write    << generic_v2->read_ack_register.bit_offset;
>
>          return apei_write(val, &generic_v2->read_ack_register);
> }
I will make this change in the next version.

Thanks,
Tyler
>> +	rc = apei_write(val, &generic_v2->read_ack_register);
>> +
>> +	return rc;
>> +}
>> +
>>   static int ghes_proc(struct ghes *ghes)
>>   {
>>   	int rc;

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  2017-04-12 13:34     ` Borislav Petkov
  (?)
  (?)
@ 2017-04-13 20:30         ` Baicar, Tyler
  -1 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 20:30 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall-QSEj5FYQhm4dnm+yROfE0A,
	marc.zyngier-5wv7dgnIgG8, pbonzini-H+wXaHxf7aLQT0dZR+AlfA,
	rkrcmar-H+wXaHxf7aLQT0dZR+AlfA, linux-I+IVW8TIWO2tmTQ+vhA3Yw,
	catalin.marinas-5wv7dgnIgG8, will.deacon-5wv7dgnIgG8,
	rjw-LthD3rsA81gm4RdzfppkhA, lenb-DgEjT+Ai2ygdnm+yROfE0A,
	matt-mF/unelCI9GS6iBeEJttW/XRex20P6io,
	robert.moore-ral2JQCrhuEAvxtiuMwx3w,
	lv.zheng-ral2JQCrhuEAvxtiuMwx3w, nkaje-sgV2jX0FEOL9JmXXK+q4OQ,
	zjzhang-sgV2jX0FEOL9JmXXK+q4OQ, mark.rutland-5wv7dgnIgG8,
	james.morse-5wv7dgnIgG8, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b,
	eun.taik.lee-Sze3O3UU22JBDgjK7y7TUQ,
	sandeepa.s.prabhu-Re5JQEeQqe8AvxtiuMwx3w,
	labbott-H+wXaHxf7aLQT0dZR+AlfA, shijie.huang-5wv7dgnIgG8,
	rruigrok-sgV2jX0FEOL9JmXXK+q4OQ,
	paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ, tn-nYOzD4b6Jr9Wk0Htik3J/w,
	fu.wei-QSEj5FYQhm4dnm+yROfE0A, rostedt-nx8X9YLhiw1AfugRpC6u6w,
	bristot-H+wXaHxf7aLQT0dZR+AlfA,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
	kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg,
	kvm-u79uwXL29TY76Z2rM5mHXA, linux-kernel-u79uwXL29TY76Z2rM5mHXA,
	linux-acpi-u79uwXL29TY76Z2rM5mHXA,
	linux-efi-u79uwXL29TY76Z2rM5mHXA

On 4/12/2017 7:34 AM, Borislav Petkov wrote:
>> Subject: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
> Use a verb in your patch subjects: "Add support for ..." or so.
Hello Boris,

Will do in the next version.
>
> On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
>> Currently when a RAS error is reported it is not timestamped.
> What is a RAS error? You mean a hardware error?
Will change to hardware error.
>
>> The ACPI 6.1 spec adds the timestamp field to the generic error
>> data entry v3 structure. The timestamp of when the firmware
>> generated the error is now being reported.
> So what this patch does doesn't have a lot to to do with the Subject?
> Please state what the patch does in the Subject.
I'll change the wording to describe it better.
>
> Also, your commit message talks about adding timestamp but the patch
> does more. You need to state that too and explain what this patch does
> actually.
I'll break this up into two patches as you suggest below so that this 
only adds the timestamp and the new patch adds the helper defines and usage.
>> Signed-off-by: Tyler Baicar <tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>> Reviewed-by: James Morse <james.morse-5wv7dgnIgG8@public.gmane.org>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>> ---
>>   drivers/acpi/apei/ghes.c    |  9 ++++---
>>   drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
>>   include/acpi/ghes.h         | 22 ++++++++++++++++
>>   3 files changed, 77 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index 0241e36..9ddbb93 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>>   	int flags = -1;
>>   	int sec_sev = ghes_severity(gdata->error_severity);
>>   	struct cper_sec_mem_err *mem_err;
>> -	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
>> +
>> +	mem_err = acpi_hest_generic_data_payload(gdata);
>>   
>>   	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
>>   		return;
>> @@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
>>   		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>>   				 CPER_SEC_PLATFORM_MEM)) {
>>   			struct cper_sec_mem_err *mem_err;
>> -			mem_err = (struct cper_sec_mem_err *)(gdata+1);
>> +
>> +			mem_err = acpi_hest_generic_data_payload(gdata);
>>   			ghes_edac_report_mem_error(ghes, sev, mem_err);
>>   
>>   			arch_apei_report_mem_error(sev, mem_err);
>> @@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
>>   		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>>   				      CPER_SEC_PCIE)) {
>>   			struct cper_sec_pcie *pcie_err;
>> -			pcie_err = (struct cper_sec_pcie *)(gdata+1);
>> +
>> +			pcie_err = acpi_hest_generic_data_payload(gdata);
>>   			if (sev == GHES_SEV_RECOVERABLE &&
>>   			    sec_sev == GHES_SEV_RECOVERABLE &&
>>   			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index d425374..8fa4e23 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -32,6 +32,9 @@
>>   #include <linux/acpi.h>
>>   #include <linux/pci.h>
>>   #include <linux/aer.h>
>> +#include <linux/printk.h>
>> +#include <linux/bcd.h>
>> +#include <acpi/ghes.h>
>>   
>>   #define INDENT_SP	" "
>>   
>> @@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>>   	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>>   }
>>   
>> +static void cper_estatus_print_section_v300(const char *pfx,
>> +	const struct acpi_hest_generic_data_v300 *gdata)
> Yuck, acpi_hest_generic_data_v300. Can we make those struct names smaller pls?
> And v300 is just silly.
>
> And then align args at opening brace.
Will do.
>
>> +{
>> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
>> +
>> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
>> +		timestamp = (__u8 *)&(gdata->time_stamp);
>> +		sec = bcd2bin(timestamp[0]);
>> +		min = bcd2bin(timestamp[1]);
>> +		hour = bcd2bin(timestamp[2]);
>> +		day = bcd2bin(timestamp[4]);
>> +		mon = bcd2bin(timestamp[5]);
>> +		year = bcd2bin(timestamp[6]);
>> +		century = bcd2bin(timestamp[7]);
> Align those vertically on the = sign.
Will do.
>
>> +		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
>> +			0x01 & *(timestamp + 3) ? "precise" : "",
> Move that test in a separate if-statement - that printk is unreadable as
> it is. Also, the test bit always comes second.
Will do.
>> 			century,
>> +			year, mon, day, hour, min, sec);
>> +	}
>> +}
>> +
>>   static void cper_estatus_print_section(
>> -	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
>> +	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)
> static void
> cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
> 			   int sec_no)
>
> looks much better.
All I did here was remove the const, but will do.
>>   {
>>   	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>>   	__u16 severity;
>>   	char newpfx[64];
>>   
>> +	if (acpi_hest_generic_data_version(gdata) >= 3)
> Jeez, that macro name is like a one-lined book!
>
> Let's make that "hest_gdata_ver()" or something else shorter.
As Joe mentioned, acpi_hest_generic<foo> is already used throughout this 
code base. I do not see the value in varying from the preexisting naming 
style.
>
>> +		cper_estatus_print_section_v300(pfx,
>> +			(const struct acpi_hest_generic_data_v300 *)gdata);
>> +
>>   	severity = gdata->error_severity;
>>   	printk("%s""Error %d, type: %s\n", pfx, sec_no,
>>   	       cper_severity_str(severity));
>> @@ -403,14 +430,18 @@ static void cper_estatus_print_section(
>>   
>>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>>   	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
>> -		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
>> +		struct cper_sec_proc_generic *proc_err;
>> +
>> +		proc_err = acpi_hest_generic_data_payload(gdata);
> This looks like an unrelated change. The payload function addition and the
> conversion of the code to use it should be a separate patch. And shorten that
> function name too pls.
I'll break this into two patches.
>
>>   		printk("%s""section_type: general processor error\n", newpfx);
>>   		if (gdata->error_data_length >= sizeof(*proc_err))
>>   			cper_print_proc_generic(newpfx, proc_err);
>>   		else
>>   			goto err_section_too_small;
>>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
>> -		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
>> +		struct cper_sec_mem_err *mem_err;
>> +
>> +		mem_err = acpi_hest_generic_data_payload(gdata);
>>   		printk("%s""section_type: memory error\n", newpfx);
>>   		if (gdata->error_data_length >=
>>   		    sizeof(struct cper_sec_mem_err_old))
>> @@ -419,7 +450,9 @@ static void cper_estatus_print_section(
>>   		else
>>   			goto err_section_too_small;
>>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
>> -		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
>> +		struct cper_sec_pcie *pcie;
>> +
>> +		pcie = acpi_hest_generic_data_payload(gdata);
>>   		printk("%s""section_type: PCIe error\n", newpfx);
>>   		if (gdata->error_data_length >= sizeof(*pcie))
>>   			cper_print_pcie(newpfx, pcie, gdata);
>> @@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
>>   			const struct acpi_hest_generic_status *estatus)
>>   {
>>   	struct acpi_hest_generic_data *gdata;
>> -	unsigned int data_len, gedata_len;
>> +	unsigned int data_len;
>>   	int sec_no = 0;
>>   	char newpfx[64];
>>   	__u16 severity;
>> @@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
>>   	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>>   	data_len = estatus->data_length;
>>   	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>> +
>>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>> -	while (data_len >= sizeof(*gdata)) {
>> -		gedata_len = gdata->error_data_length;
>> +
>> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>>   		cper_estatus_print_section(newpfx, gdata, sec_no);
>> -		data_len -= gedata_len + sizeof(*gdata);
>> -		gdata = (void *)(gdata + 1) + gedata_len;
>> +		data_len -= acpi_hest_generic_data_record_size(gdata);
>> +		gdata = acpi_hest_generic_data_next(gdata);
>>   		sec_no++;
>>   	}
>>   }
>> @@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>>   		return rc;
>>   	data_len = estatus->data_length;
>>   	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>> -	while (data_len >= sizeof(*gdata)) {
>> -		gedata_len = gdata->error_data_length;
>> -		if (gedata_len > data_len - sizeof(*gdata))
>> +
>> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>> +		gedata_len = acpi_hest_generic_data_error_length(gdata);
>> +		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
>>   			return -EINVAL;
>> -		data_len -= gedata_len + sizeof(*gdata);
>> -		gdata = (void *)(gdata + 1) + gedata_len;
>> +		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
>> +		gdata = acpi_hest_generic_data_next(gdata);
>>   	}
>>   	if (data_len)
>>   		return -EINVAL;
>> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
>> index 68f088a..6ae318b 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -12,6 +12,18 @@
>>   #define GHES_TO_CLEAR		0x0001
>>   #define GHES_EXITING		0x0002
>>   
>> +#define acpi_hest_generic_data_error_length(gdata)	\
>> +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
>> +#define acpi_hest_generic_data_size(gdata)		\
>> +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
>> +	sizeof(struct acpi_hest_generic_data_v300) :	\
>> +	sizeof(struct acpi_hest_generic_data))
>> +#define acpi_hest_generic_data_record_size(gdata)	\
>> +	(acpi_hest_generic_data_size(gdata) +		\
>> +	acpi_hest_generic_data_error_length(gdata))
>> +#define acpi_hest_generic_data_next(gdata)		\
>> +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
> This is one unreadable pile of too long names with a clearly redundant
> and too long prefix. Please shorten it all.
>
>> +
>>   struct ghes {
>>   	union {
>>   		struct acpi_hest_generic *generic;
>> @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
>>   {
>>   }
>>   #endif
>> +
>> +#define acpi_hest_generic_data_version(gdata)			\
>> +	(gdata->revision >> 8)
>> +
>> +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
> Lemme try to shorten it:
>
> static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
> {
> 	if (hest_gdata_ver(d) >= 3)
> 		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
> 	else
> 		return d + 1;
> }
>
> Now this is much more readable IMO. You can actually see what's going
> on. And you still know what the struct names are.
>
> So let's drop all that unnecessary too long prefixing and make the
> code readable. That cper thing needs a lot more scrubbing, of course,
> but some other day.
I do not agree with this. The struct being passed to this function is 
already named acpi_hest_generic_data in the existing code and all over 
this code is named gdata not just d.

Also, these helpers already helped this code be significantly more 
readable. They were added in version 4 of this series to reduce code 
duplication and make iterating over the generic data entries readable. 
https://lkml.org/lkml/2016/10/11/454

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-13 20:30         ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 20:30 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On 4/12/2017 7:34 AM, Borislav Petkov wrote:
>> Subject: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
> Use a verb in your patch subjects: "Add support for ..." or so.
Hello Boris,

Will do in the next version.
>
> On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
>> Currently when a RAS error is reported it is not timestamped.
> What is a RAS error? You mean a hardware error?
Will change to hardware error.
>
>> The ACPI 6.1 spec adds the timestamp field to the generic error
>> data entry v3 structure. The timestamp of when the firmware
>> generated the error is now being reported.
> So what this patch does doesn't have a lot to to do with the Subject?
> Please state what the patch does in the Subject.
I'll change the wording to describe it better.
>
> Also, your commit message talks about adding timestamp but the patch
> does more. You need to state that too and explain what this patch does
> actually.
I'll break this up into two patches as you suggest below so that this 
only adds the timestamp and the new patch adds the helper defines and usage.
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>   drivers/acpi/apei/ghes.c    |  9 ++++---
>>   drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
>>   include/acpi/ghes.h         | 22 ++++++++++++++++
>>   3 files changed, 77 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index 0241e36..9ddbb93 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>>   	int flags = -1;
>>   	int sec_sev = ghes_severity(gdata->error_severity);
>>   	struct cper_sec_mem_err *mem_err;
>> -	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
>> +
>> +	mem_err = acpi_hest_generic_data_payload(gdata);
>>   
>>   	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
>>   		return;
>> @@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
>>   		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>>   				 CPER_SEC_PLATFORM_MEM)) {
>>   			struct cper_sec_mem_err *mem_err;
>> -			mem_err = (struct cper_sec_mem_err *)(gdata+1);
>> +
>> +			mem_err = acpi_hest_generic_data_payload(gdata);
>>   			ghes_edac_report_mem_error(ghes, sev, mem_err);
>>   
>>   			arch_apei_report_mem_error(sev, mem_err);
>> @@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
>>   		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>>   				      CPER_SEC_PCIE)) {
>>   			struct cper_sec_pcie *pcie_err;
>> -			pcie_err = (struct cper_sec_pcie *)(gdata+1);
>> +
>> +			pcie_err = acpi_hest_generic_data_payload(gdata);
>>   			if (sev == GHES_SEV_RECOVERABLE &&
>>   			    sec_sev == GHES_SEV_RECOVERABLE &&
>>   			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index d425374..8fa4e23 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -32,6 +32,9 @@
>>   #include <linux/acpi.h>
>>   #include <linux/pci.h>
>>   #include <linux/aer.h>
>> +#include <linux/printk.h>
>> +#include <linux/bcd.h>
>> +#include <acpi/ghes.h>
>>   
>>   #define INDENT_SP	" "
>>   
>> @@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>>   	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>>   }
>>   
>> +static void cper_estatus_print_section_v300(const char *pfx,
>> +	const struct acpi_hest_generic_data_v300 *gdata)
> Yuck, acpi_hest_generic_data_v300. Can we make those struct names smaller pls?
> And v300 is just silly.
>
> And then align args at opening brace.
Will do.
>
>> +{
>> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
>> +
>> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
>> +		timestamp = (__u8 *)&(gdata->time_stamp);
>> +		sec = bcd2bin(timestamp[0]);
>> +		min = bcd2bin(timestamp[1]);
>> +		hour = bcd2bin(timestamp[2]);
>> +		day = bcd2bin(timestamp[4]);
>> +		mon = bcd2bin(timestamp[5]);
>> +		year = bcd2bin(timestamp[6]);
>> +		century = bcd2bin(timestamp[7]);
> Align those vertically on the = sign.
Will do.
>
>> +		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
>> +			0x01 & *(timestamp + 3) ? "precise" : "",
> Move that test in a separate if-statement - that printk is unreadable as
> it is. Also, the test bit always comes second.
Will do.
>> 			century,
>> +			year, mon, day, hour, min, sec);
>> +	}
>> +}
>> +
>>   static void cper_estatus_print_section(
>> -	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
>> +	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)
> static void
> cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
> 			   int sec_no)
>
> looks much better.
All I did here was remove the const, but will do.
>>   {
>>   	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>>   	__u16 severity;
>>   	char newpfx[64];
>>   
>> +	if (acpi_hest_generic_data_version(gdata) >= 3)
> Jeez, that macro name is like a one-lined book!
>
> Let's make that "hest_gdata_ver()" or something else shorter.
As Joe mentioned, acpi_hest_generic<foo> is already used throughout this 
code base. I do not see the value in varying from the preexisting naming 
style.
>
>> +		cper_estatus_print_section_v300(pfx,
>> +			(const struct acpi_hest_generic_data_v300 *)gdata);
>> +
>>   	severity = gdata->error_severity;
>>   	printk("%s""Error %d, type: %s\n", pfx, sec_no,
>>   	       cper_severity_str(severity));
>> @@ -403,14 +430,18 @@ static void cper_estatus_print_section(
>>   
>>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>>   	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
>> -		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
>> +		struct cper_sec_proc_generic *proc_err;
>> +
>> +		proc_err = acpi_hest_generic_data_payload(gdata);
> This looks like an unrelated change. The payload function addition and the
> conversion of the code to use it should be a separate patch. And shorten that
> function name too pls.
I'll break this into two patches.
>
>>   		printk("%s""section_type: general processor error\n", newpfx);
>>   		if (gdata->error_data_length >= sizeof(*proc_err))
>>   			cper_print_proc_generic(newpfx, proc_err);
>>   		else
>>   			goto err_section_too_small;
>>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
>> -		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
>> +		struct cper_sec_mem_err *mem_err;
>> +
>> +		mem_err = acpi_hest_generic_data_payload(gdata);
>>   		printk("%s""section_type: memory error\n", newpfx);
>>   		if (gdata->error_data_length >=
>>   		    sizeof(struct cper_sec_mem_err_old))
>> @@ -419,7 +450,9 @@ static void cper_estatus_print_section(
>>   		else
>>   			goto err_section_too_small;
>>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
>> -		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
>> +		struct cper_sec_pcie *pcie;
>> +
>> +		pcie = acpi_hest_generic_data_payload(gdata);
>>   		printk("%s""section_type: PCIe error\n", newpfx);
>>   		if (gdata->error_data_length >= sizeof(*pcie))
>>   			cper_print_pcie(newpfx, pcie, gdata);
>> @@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
>>   			const struct acpi_hest_generic_status *estatus)
>>   {
>>   	struct acpi_hest_generic_data *gdata;
>> -	unsigned int data_len, gedata_len;
>> +	unsigned int data_len;
>>   	int sec_no = 0;
>>   	char newpfx[64];
>>   	__u16 severity;
>> @@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
>>   	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>>   	data_len = estatus->data_length;
>>   	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>> +
>>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>> -	while (data_len >= sizeof(*gdata)) {
>> -		gedata_len = gdata->error_data_length;
>> +
>> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>>   		cper_estatus_print_section(newpfx, gdata, sec_no);
>> -		data_len -= gedata_len + sizeof(*gdata);
>> -		gdata = (void *)(gdata + 1) + gedata_len;
>> +		data_len -= acpi_hest_generic_data_record_size(gdata);
>> +		gdata = acpi_hest_generic_data_next(gdata);
>>   		sec_no++;
>>   	}
>>   }
>> @@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>>   		return rc;
>>   	data_len = estatus->data_length;
>>   	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>> -	while (data_len >= sizeof(*gdata)) {
>> -		gedata_len = gdata->error_data_length;
>> -		if (gedata_len > data_len - sizeof(*gdata))
>> +
>> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>> +		gedata_len = acpi_hest_generic_data_error_length(gdata);
>> +		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
>>   			return -EINVAL;
>> -		data_len -= gedata_len + sizeof(*gdata);
>> -		gdata = (void *)(gdata + 1) + gedata_len;
>> +		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
>> +		gdata = acpi_hest_generic_data_next(gdata);
>>   	}
>>   	if (data_len)
>>   		return -EINVAL;
>> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
>> index 68f088a..6ae318b 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -12,6 +12,18 @@
>>   #define GHES_TO_CLEAR		0x0001
>>   #define GHES_EXITING		0x0002
>>   
>> +#define acpi_hest_generic_data_error_length(gdata)	\
>> +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
>> +#define acpi_hest_generic_data_size(gdata)		\
>> +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
>> +	sizeof(struct acpi_hest_generic_data_v300) :	\
>> +	sizeof(struct acpi_hest_generic_data))
>> +#define acpi_hest_generic_data_record_size(gdata)	\
>> +	(acpi_hest_generic_data_size(gdata) +		\
>> +	acpi_hest_generic_data_error_length(gdata))
>> +#define acpi_hest_generic_data_next(gdata)		\
>> +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
> This is one unreadable pile of too long names with a clearly redundant
> and too long prefix. Please shorten it all.
>
>> +
>>   struct ghes {
>>   	union {
>>   		struct acpi_hest_generic *generic;
>> @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
>>   {
>>   }
>>   #endif
>> +
>> +#define acpi_hest_generic_data_version(gdata)			\
>> +	(gdata->revision >> 8)
>> +
>> +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
> Lemme try to shorten it:
>
> static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
> {
> 	if (hest_gdata_ver(d) >= 3)
> 		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
> 	else
> 		return d + 1;
> }
>
> Now this is much more readable IMO. You can actually see what's going
> on. And you still know what the struct names are.
>
> So let's drop all that unnecessary too long prefixing and make the
> code readable. That cper thing needs a lot more scrubbing, of course,
> but some other day.
I do not agree with this. The struct being passed to this function is 
already named acpi_hest_generic_data in the existing code and all over 
this code is named gdata not just d.

Also, these helpers already helped this code be significantly more 
readable. They were added in version 4 of this series to reduce code 
duplication and make iterating over the generic data entries readable. 
https://lkml.org/lkml/2016/10/11/454

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-13 20:30         ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 20:30 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall-QSEj5FYQhm4dnm+yROfE0A,
	marc.zyngier-5wv7dgnIgG8, pbonzini-H+wXaHxf7aLQT0dZR+AlfA,
	rkrcmar-H+wXaHxf7aLQT0dZR+AlfA, linux-I+IVW8TIWO2tmTQ+vhA3Yw,
	catalin.marinas-5wv7dgnIgG8, will.deacon-5wv7dgnIgG8,
	rjw-LthD3rsA81gm4RdzfppkhA, lenb-DgEjT+Ai2ygdnm+yROfE0A,
	matt-mF/unelCI9GS6iBeEJttW/XRex20P6io,
	robert.moore-ral2JQCrhuEAvxtiuMwx3w,
	lv.zheng-ral2JQCrhuEAvxtiuMwx3w, nkaje-sgV2jX0FEOL9JmXXK+q4OQ,
	zjzhang-sgV2jX0FEOL9JmXXK+q4OQ, mark.rutland-5wv7dgnIgG8,
	james.morse-5wv7dgnIgG8, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b,
	eun.taik.lee-Sze3O3UU22JBDgjK7y7TUQ,
	sandeepa.s.prabhu-Re5JQEeQqe8AvxtiuMwx3w,
	labbott-H+wXaHxf7aLQT0dZR+AlfA, shijie.huang-5wv7dgnIgG8,
	rruigrok-sgV2jX0FEOL9JmXXK+q4OQ,
	paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ, tn-nYOzD4b6Jr9Wk0Htik3J/w,
	fu.wei-QSEj5FYQhm4dnm+yROfE0A, rostedt-nx8X9YLhiw1AfugRpC6u6w,
	bristot-H+wXaHxf7aLQT0dZR+AlfA,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
	kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg,
	kvm-u79uwXL29TY76Z2rM5mHXA, linux-kernel-u79uwXL29TY76Z2rM5mHXA,
	linux-acpi-u79uwXL29TY76Z2rM5mHXA,
	linux-efi-u79uwXL29TY76Z2rM5mHXA

On 4/12/2017 7:34 AM, Borislav Petkov wrote:
>> Subject: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
> Use a verb in your patch subjects: "Add support for ..." or so.
Hello Boris,

Will do in the next version.
>
> On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
>> Currently when a RAS error is reported it is not timestamped.
> What is a RAS error? You mean a hardware error?
Will change to hardware error.
>
>> The ACPI 6.1 spec adds the timestamp field to the generic error
>> data entry v3 structure. The timestamp of when the firmware
>> generated the error is now being reported.
> So what this patch does doesn't have a lot to to do with the Subject?
> Please state what the patch does in the Subject.
I'll change the wording to describe it better.
>
> Also, your commit message talks about adding timestamp but the patch
> does more. You need to state that too and explain what this patch does
> actually.
I'll break this up into two patches as you suggest below so that this 
only adds the timestamp and the new patch adds the helper defines and usage.
>> Signed-off-by: Tyler Baicar <tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>> Reviewed-by: James Morse <james.morse-5wv7dgnIgG8@public.gmane.org>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>> ---
>>   drivers/acpi/apei/ghes.c    |  9 ++++---
>>   drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
>>   include/acpi/ghes.h         | 22 ++++++++++++++++
>>   3 files changed, 77 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index 0241e36..9ddbb93 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>>   	int flags = -1;
>>   	int sec_sev = ghes_severity(gdata->error_severity);
>>   	struct cper_sec_mem_err *mem_err;
>> -	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
>> +
>> +	mem_err = acpi_hest_generic_data_payload(gdata);
>>   
>>   	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
>>   		return;
>> @@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
>>   		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>>   				 CPER_SEC_PLATFORM_MEM)) {
>>   			struct cper_sec_mem_err *mem_err;
>> -			mem_err = (struct cper_sec_mem_err *)(gdata+1);
>> +
>> +			mem_err = acpi_hest_generic_data_payload(gdata);
>>   			ghes_edac_report_mem_error(ghes, sev, mem_err);
>>   
>>   			arch_apei_report_mem_error(sev, mem_err);
>> @@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
>>   		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>>   				      CPER_SEC_PCIE)) {
>>   			struct cper_sec_pcie *pcie_err;
>> -			pcie_err = (struct cper_sec_pcie *)(gdata+1);
>> +
>> +			pcie_err = acpi_hest_generic_data_payload(gdata);
>>   			if (sev == GHES_SEV_RECOVERABLE &&
>>   			    sec_sev == GHES_SEV_RECOVERABLE &&
>>   			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index d425374..8fa4e23 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -32,6 +32,9 @@
>>   #include <linux/acpi.h>
>>   #include <linux/pci.h>
>>   #include <linux/aer.h>
>> +#include <linux/printk.h>
>> +#include <linux/bcd.h>
>> +#include <acpi/ghes.h>
>>   
>>   #define INDENT_SP	" "
>>   
>> @@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>>   	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>>   }
>>   
>> +static void cper_estatus_print_section_v300(const char *pfx,
>> +	const struct acpi_hest_generic_data_v300 *gdata)
> Yuck, acpi_hest_generic_data_v300. Can we make those struct names smaller pls?
> And v300 is just silly.
>
> And then align args at opening brace.
Will do.
>
>> +{
>> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
>> +
>> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
>> +		timestamp = (__u8 *)&(gdata->time_stamp);
>> +		sec = bcd2bin(timestamp[0]);
>> +		min = bcd2bin(timestamp[1]);
>> +		hour = bcd2bin(timestamp[2]);
>> +		day = bcd2bin(timestamp[4]);
>> +		mon = bcd2bin(timestamp[5]);
>> +		year = bcd2bin(timestamp[6]);
>> +		century = bcd2bin(timestamp[7]);
> Align those vertically on the = sign.
Will do.
>
>> +		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
>> +			0x01 & *(timestamp + 3) ? "precise" : "",
> Move that test in a separate if-statement - that printk is unreadable as
> it is. Also, the test bit always comes second.
Will do.
>> 			century,
>> +			year, mon, day, hour, min, sec);
>> +	}
>> +}
>> +
>>   static void cper_estatus_print_section(
>> -	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
>> +	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)
> static void
> cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
> 			   int sec_no)
>
> looks much better.
All I did here was remove the const, but will do.
>>   {
>>   	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>>   	__u16 severity;
>>   	char newpfx[64];
>>   
>> +	if (acpi_hest_generic_data_version(gdata) >= 3)
> Jeez, that macro name is like a one-lined book!
>
> Let's make that "hest_gdata_ver()" or something else shorter.
As Joe mentioned, acpi_hest_generic<foo> is already used throughout this 
code base. I do not see the value in varying from the preexisting naming 
style.
>
>> +		cper_estatus_print_section_v300(pfx,
>> +			(const struct acpi_hest_generic_data_v300 *)gdata);
>> +
>>   	severity = gdata->error_severity;
>>   	printk("%s""Error %d, type: %s\n", pfx, sec_no,
>>   	       cper_severity_str(severity));
>> @@ -403,14 +430,18 @@ static void cper_estatus_print_section(
>>   
>>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>>   	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
>> -		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
>> +		struct cper_sec_proc_generic *proc_err;
>> +
>> +		proc_err = acpi_hest_generic_data_payload(gdata);
> This looks like an unrelated change. The payload function addition and the
> conversion of the code to use it should be a separate patch. And shorten that
> function name too pls.
I'll break this into two patches.
>
>>   		printk("%s""section_type: general processor error\n", newpfx);
>>   		if (gdata->error_data_length >= sizeof(*proc_err))
>>   			cper_print_proc_generic(newpfx, proc_err);
>>   		else
>>   			goto err_section_too_small;
>>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
>> -		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
>> +		struct cper_sec_mem_err *mem_err;
>> +
>> +		mem_err = acpi_hest_generic_data_payload(gdata);
>>   		printk("%s""section_type: memory error\n", newpfx);
>>   		if (gdata->error_data_length >=
>>   		    sizeof(struct cper_sec_mem_err_old))
>> @@ -419,7 +450,9 @@ static void cper_estatus_print_section(
>>   		else
>>   			goto err_section_too_small;
>>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
>> -		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
>> +		struct cper_sec_pcie *pcie;
>> +
>> +		pcie = acpi_hest_generic_data_payload(gdata);
>>   		printk("%s""section_type: PCIe error\n", newpfx);
>>   		if (gdata->error_data_length >= sizeof(*pcie))
>>   			cper_print_pcie(newpfx, pcie, gdata);
>> @@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
>>   			const struct acpi_hest_generic_status *estatus)
>>   {
>>   	struct acpi_hest_generic_data *gdata;
>> -	unsigned int data_len, gedata_len;
>> +	unsigned int data_len;
>>   	int sec_no = 0;
>>   	char newpfx[64];
>>   	__u16 severity;
>> @@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
>>   	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>>   	data_len = estatus->data_length;
>>   	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>> +
>>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>> -	while (data_len >= sizeof(*gdata)) {
>> -		gedata_len = gdata->error_data_length;
>> +
>> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>>   		cper_estatus_print_section(newpfx, gdata, sec_no);
>> -		data_len -= gedata_len + sizeof(*gdata);
>> -		gdata = (void *)(gdata + 1) + gedata_len;
>> +		data_len -= acpi_hest_generic_data_record_size(gdata);
>> +		gdata = acpi_hest_generic_data_next(gdata);
>>   		sec_no++;
>>   	}
>>   }
>> @@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>>   		return rc;
>>   	data_len = estatus->data_length;
>>   	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>> -	while (data_len >= sizeof(*gdata)) {
>> -		gedata_len = gdata->error_data_length;
>> -		if (gedata_len > data_len - sizeof(*gdata))
>> +
>> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>> +		gedata_len = acpi_hest_generic_data_error_length(gdata);
>> +		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
>>   			return -EINVAL;
>> -		data_len -= gedata_len + sizeof(*gdata);
>> -		gdata = (void *)(gdata + 1) + gedata_len;
>> +		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
>> +		gdata = acpi_hest_generic_data_next(gdata);
>>   	}
>>   	if (data_len)
>>   		return -EINVAL;
>> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
>> index 68f088a..6ae318b 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -12,6 +12,18 @@
>>   #define GHES_TO_CLEAR		0x0001
>>   #define GHES_EXITING		0x0002
>>   
>> +#define acpi_hest_generic_data_error_length(gdata)	\
>> +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
>> +#define acpi_hest_generic_data_size(gdata)		\
>> +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
>> +	sizeof(struct acpi_hest_generic_data_v300) :	\
>> +	sizeof(struct acpi_hest_generic_data))
>> +#define acpi_hest_generic_data_record_size(gdata)	\
>> +	(acpi_hest_generic_data_size(gdata) +		\
>> +	acpi_hest_generic_data_error_length(gdata))
>> +#define acpi_hest_generic_data_next(gdata)		\
>> +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
> This is one unreadable pile of too long names with a clearly redundant
> and too long prefix. Please shorten it all.
>
>> +
>>   struct ghes {
>>   	union {
>>   		struct acpi_hest_generic *generic;
>> @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
>>   {
>>   }
>>   #endif
>> +
>> +#define acpi_hest_generic_data_version(gdata)			\
>> +	(gdata->revision >> 8)
>> +
>> +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
> Lemme try to shorten it:
>
> static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
> {
> 	if (hest_gdata_ver(d) >= 3)
> 		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
> 	else
> 		return d + 1;
> }
>
> Now this is much more readable IMO. You can actually see what's going
> on. And you still know what the struct names are.
>
> So let's drop all that unnecessary too long prefixing and make the
> code readable. That cper thing needs a lot more scrubbing, of course,
> but some other day.
I do not agree with this. The struct being passed to this function is 
already named acpi_hest_generic_data in the existing code and all over 
this code is named gdata not just d.

Also, these helpers already helped this code be significantly more 
readable. They were added in version 4 of this series to reduce code 
duplication and make iterating over the generic data entries readable. 
https://lkml.org/lkml/2016/10/11/454

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-13 20:30         ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 20:30 UTC (permalink / raw)
  To: linux-arm-kernel

On 4/12/2017 7:34 AM, Borislav Petkov wrote:
>> Subject: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
> Use a verb in your patch subjects: "Add support for ..." or so.
Hello Boris,

Will do in the next version.
>
> On Tue, Mar 28, 2017 at 01:30:32PM -0600, Tyler Baicar wrote:
>> Currently when a RAS error is reported it is not timestamped.
> What is a RAS error? You mean a hardware error?
Will change to hardware error.
>
>> The ACPI 6.1 spec adds the timestamp field to the generic error
>> data entry v3 structure. The timestamp of when the firmware
>> generated the error is now being reported.
> So what this patch does doesn't have a lot to to do with the Subject?
> Please state what the patch does in the Subject.
I'll change the wording to describe it better.
>
> Also, your commit message talks about adding timestamp but the patch
> does more. You need to state that too and explain what this patch does
> actually.
I'll break this up into two patches as you suggest below so that this 
only adds the timestamp and the new patch adds the helper defines and usage.
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>   drivers/acpi/apei/ghes.c    |  9 ++++---
>>   drivers/firmware/efi/cper.c | 63 +++++++++++++++++++++++++++++++++++----------
>>   include/acpi/ghes.h         | 22 ++++++++++++++++
>>   3 files changed, 77 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index 0241e36..9ddbb93 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -421,7 +421,8 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
>>   	int flags = -1;
>>   	int sec_sev = ghes_severity(gdata->error_severity);
>>   	struct cper_sec_mem_err *mem_err;
>> -	mem_err = (struct cper_sec_mem_err *)(gdata + 1);
>> +
>> +	mem_err = acpi_hest_generic_data_payload(gdata);
>>   
>>   	if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
>>   		return;
>> @@ -458,7 +459,8 @@ static void ghes_do_proc(struct ghes *ghes,
>>   		if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>>   				 CPER_SEC_PLATFORM_MEM)) {
>>   			struct cper_sec_mem_err *mem_err;
>> -			mem_err = (struct cper_sec_mem_err *)(gdata+1);
>> +
>> +			mem_err = acpi_hest_generic_data_payload(gdata);
>>   			ghes_edac_report_mem_error(ghes, sev, mem_err);
>>   
>>   			arch_apei_report_mem_error(sev, mem_err);
>> @@ -468,7 +470,8 @@ static void ghes_do_proc(struct ghes *ghes,
>>   		else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
>>   				      CPER_SEC_PCIE)) {
>>   			struct cper_sec_pcie *pcie_err;
>> -			pcie_err = (struct cper_sec_pcie *)(gdata+1);
>> +
>> +			pcie_err = acpi_hest_generic_data_payload(gdata);
>>   			if (sev == GHES_SEV_RECOVERABLE &&
>>   			    sec_sev == GHES_SEV_RECOVERABLE &&
>>   			    pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index d425374..8fa4e23 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -32,6 +32,9 @@
>>   #include <linux/acpi.h>
>>   #include <linux/pci.h>
>>   #include <linux/aer.h>
>> +#include <linux/printk.h>
>> +#include <linux/bcd.h>
>> +#include <acpi/ghes.h>
>>   
>>   #define INDENT_SP	" "
>>   
>> @@ -386,13 +389,37 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>>   	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>>   }
>>   
>> +static void cper_estatus_print_section_v300(const char *pfx,
>> +	const struct acpi_hest_generic_data_v300 *gdata)
> Yuck, acpi_hest_generic_data_v300. Can we make those struct names smaller pls?
> And v300 is just silly.
>
> And then align args at opening brace.
Will do.
>
>> +{
>> +	__u8 hour, min, sec, day, mon, year, century, *timestamp;
>> +
>> +	if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
>> +		timestamp = (__u8 *)&(gdata->time_stamp);
>> +		sec = bcd2bin(timestamp[0]);
>> +		min = bcd2bin(timestamp[1]);
>> +		hour = bcd2bin(timestamp[2]);
>> +		day = bcd2bin(timestamp[4]);
>> +		mon = bcd2bin(timestamp[5]);
>> +		year = bcd2bin(timestamp[6]);
>> +		century = bcd2bin(timestamp[7]);
> Align those vertically on the = sign.
Will do.
>
>> +		printk("%stime: %7s %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
>> +			0x01 & *(timestamp + 3) ? "precise" : "",
> Move that test in a separate if-statement - that printk is unreadable as
> it is. Also, the test bit always comes second.
Will do.
>> 			century,
>> +			year, mon, day, hour, min, sec);
>> +	}
>> +}
>> +
>>   static void cper_estatus_print_section(
>> -	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
>> +	const char *pfx, struct acpi_hest_generic_data *gdata, int sec_no)
> static void
> cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
> 			   int sec_no)
>
> looks much better.
All I did here was remove the const, but will do.
>>   {
>>   	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>>   	__u16 severity;
>>   	char newpfx[64];
>>   
>> +	if (acpi_hest_generic_data_version(gdata) >= 3)
> Jeez, that macro name is like a one-lined book!
>
> Let's make that "hest_gdata_ver()" or something else shorter.
As Joe mentioned, acpi_hest_generic<foo> is already used throughout this 
code base. I do not see the value in varying from the preexisting naming 
style.
>
>> +		cper_estatus_print_section_v300(pfx,
>> +			(const struct acpi_hest_generic_data_v300 *)gdata);
>> +
>>   	severity = gdata->error_severity;
>>   	printk("%s""Error %d, type: %s\n", pfx, sec_no,
>>   	       cper_severity_str(severity));
>> @@ -403,14 +430,18 @@ static void cper_estatus_print_section(
>>   
>>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>>   	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
>> -		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
>> +		struct cper_sec_proc_generic *proc_err;
>> +
>> +		proc_err = acpi_hest_generic_data_payload(gdata);
> This looks like an unrelated change. The payload function addition and the
> conversion of the code to use it should be a separate patch. And shorten that
> function name too pls.
I'll break this into two patches.
>
>>   		printk("%s""section_type: general processor error\n", newpfx);
>>   		if (gdata->error_data_length >= sizeof(*proc_err))
>>   			cper_print_proc_generic(newpfx, proc_err);
>>   		else
>>   			goto err_section_too_small;
>>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
>> -		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
>> +		struct cper_sec_mem_err *mem_err;
>> +
>> +		mem_err = acpi_hest_generic_data_payload(gdata);
>>   		printk("%s""section_type: memory error\n", newpfx);
>>   		if (gdata->error_data_length >=
>>   		    sizeof(struct cper_sec_mem_err_old))
>> @@ -419,7 +450,9 @@ static void cper_estatus_print_section(
>>   		else
>>   			goto err_section_too_small;
>>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
>> -		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
>> +		struct cper_sec_pcie *pcie;
>> +
>> +		pcie = acpi_hest_generic_data_payload(gdata);
>>   		printk("%s""section_type: PCIe error\n", newpfx);
>>   		if (gdata->error_data_length >= sizeof(*pcie))
>>   			cper_print_pcie(newpfx, pcie, gdata);
>> @@ -438,7 +471,7 @@ void cper_estatus_print(const char *pfx,
>>   			const struct acpi_hest_generic_status *estatus)
>>   {
>>   	struct acpi_hest_generic_data *gdata;
>> -	unsigned int data_len, gedata_len;
>> +	unsigned int data_len;
>>   	int sec_no = 0;
>>   	char newpfx[64];
>>   	__u16 severity;
>> @@ -451,12 +484,13 @@ void cper_estatus_print(const char *pfx,
>>   	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>>   	data_len = estatus->data_length;
>>   	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>> +
>>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>> -	while (data_len >= sizeof(*gdata)) {
>> -		gedata_len = gdata->error_data_length;
>> +
>> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>>   		cper_estatus_print_section(newpfx, gdata, sec_no);
>> -		data_len -= gedata_len + sizeof(*gdata);
>> -		gdata = (void *)(gdata + 1) + gedata_len;
>> +		data_len -= acpi_hest_generic_data_record_size(gdata);
>> +		gdata = acpi_hest_generic_data_next(gdata);
>>   		sec_no++;
>>   	}
>>   }
>> @@ -486,12 +520,13 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>>   		return rc;
>>   	data_len = estatus->data_length;
>>   	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>> -	while (data_len >= sizeof(*gdata)) {
>> -		gedata_len = gdata->error_data_length;
>> -		if (gedata_len > data_len - sizeof(*gdata))
>> +
>> +	while (data_len >= acpi_hest_generic_data_size(gdata)) {
>> +		gedata_len = acpi_hest_generic_data_error_length(gdata);
>> +		if (gedata_len > data_len - acpi_hest_generic_data_size(gdata))
>>   			return -EINVAL;
>> -		data_len -= gedata_len + sizeof(*gdata);
>> -		gdata = (void *)(gdata + 1) + gedata_len;
>> +		data_len -= gedata_len + acpi_hest_generic_data_size(gdata);
>> +		gdata = acpi_hest_generic_data_next(gdata);
>>   	}
>>   	if (data_len)
>>   		return -EINVAL;
>> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
>> index 68f088a..6ae318b 100644
>> --- a/include/acpi/ghes.h
>> +++ b/include/acpi/ghes.h
>> @@ -12,6 +12,18 @@
>>   #define GHES_TO_CLEAR		0x0001
>>   #define GHES_EXITING		0x0002
>>   
>> +#define acpi_hest_generic_data_error_length(gdata)	\
>> +	(((struct acpi_hest_generic_data *)(gdata))->error_data_length)
>> +#define acpi_hest_generic_data_size(gdata)		\
>> +	((acpi_hest_generic_data_version(gdata) >= 3) ?	\
>> +	sizeof(struct acpi_hest_generic_data_v300) :	\
>> +	sizeof(struct acpi_hest_generic_data))
>> +#define acpi_hest_generic_data_record_size(gdata)	\
>> +	(acpi_hest_generic_data_size(gdata) +		\
>> +	acpi_hest_generic_data_error_length(gdata))
>> +#define acpi_hest_generic_data_next(gdata)		\
>> +	((void *)(gdata) + acpi_hest_generic_data_record_size(gdata))
> This is one unreadable pile of too long names with a clearly redundant
> and too long prefix. Please shorten it all.
>
>> +
>>   struct ghes {
>>   	union {
>>   		struct acpi_hest_generic *generic;
>> @@ -73,3 +85,13 @@ static inline void ghes_edac_unregister(struct ghes *ghes)
>>   {
>>   }
>>   #endif
>> +
>> +#define acpi_hest_generic_data_version(gdata)			\
>> +	(gdata->revision >> 8)
>> +
>> +static inline void *acpi_hest_generic_data_payload(struct acpi_hest_generic_data *gdata)
> Lemme try to shorten it:
>
> static inline void *acpi_hest_get_payload(struct acpi_hest_gdata *d)
> {
> 	if (hest_gdata_ver(d) >= 3)
> 		return (void *)(((struct acpi_hest_gdata_v3 *)d) + 1);
> 	else
> 		return d + 1;
> }
>
> Now this is much more readable IMO. You can actually see what's going
> on. And you still know what the struct names are.
>
> So let's drop all that unnecessary too long prefixing and make the
> code readable. That cper thing needs a lot more scrubbing, of course,
> but some other day.
I do not agree with this. The struct being passed to this function is 
already named acpi_hest_generic_data in the existing code and all over 
this code is named gdata not just d.

Also, these helpers already helped this code be significantly more 
readable. They were added in version 4 of this series to reduce code 
duplication and make iterating over the generic data entries readable. 
https://lkml.org/lkml/2016/10/11/454

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 03/10] efi: parse ARM processor error
  2017-04-12 16:51     ` Borislav Petkov
  (?)
  (?)
@ 2017-04-13 20:32       ` Baicar, Tyler
  -1 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 20:32 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

On 4/12/2017 10:51 AM, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:33PM -0600, Tyler Baicar wrote:
>> Add support for ARM Common Platform Error Record (CPER).
>> UEFI 2.6 specification adds support for ARM specific
>> processor error information to be reported as part of the
>> CPER records. This provides more detail on for processor error logs.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>   drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
>>   include/linux/cper.h        |  54 ++++++++++++++++++
>>   2 files changed, 187 insertions(+)
>>
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index 8fa4e23..56aa516 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>>   static const char * const proc_type_strs[] = {
>>   	"IA32/X64",
>>   	"IA64",
>> +	"ARM",
>>   };
>>   
>>   static const char * const proc_isa_strs[] = {
>>   	"IA32",
>>   	"IA64",
>>   	"X64",
>> +	"ARM A32/T32",
>> +	"ARM A64",
>>   };
>>   
>>   static const char * const proc_error_type_strs[] = {
>> @@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>>   	"corrected",
>>   };
>>   
>> +static const char * const arm_reg_ctx_strs[] = {
>> +	"AArch32 general purpose registers",
>> +	"AArch32 EL1 context registers",
>> +	"AArch32 EL2 context registers",
>> +	"AArch32 secure context registers",
>> +	"AArch64 general purpose registers",
>> +	"AArch64 EL1 context registers",
>> +	"AArch64 EL2 context registers",
>> +	"AArch64 EL3 context registers",
>> +	"Misc. system register structure",
>> +};
> That...
>
>> +
>>   static void cper_print_proc_generic(const char *pfx,
>>   				    const struct cper_sec_proc_generic *proc)
>>   {
>> @@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
>>   		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
>>   }
>>   
>> +static void cper_print_proc_arm(const char *pfx,
>> +				const struct cper_sec_proc_arm *proc)
> ... and that function should go into:
>
> #if defined(CONFIG_ARM64) || defined(CONFIG_ARM)
>
> Just put them close together so that you don't have too much ifdeffery.
Hello Boris,

I will move them close together and add the ifdef.

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 03/10] efi: parse ARM processor error
@ 2017-04-13 20:32       ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 20:32 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On 4/12/2017 10:51 AM, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:33PM -0600, Tyler Baicar wrote:
>> Add support for ARM Common Platform Error Record (CPER).
>> UEFI 2.6 specification adds support for ARM specific
>> processor error information to be reported as part of the
>> CPER records. This provides more detail on for processor error logs.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>   drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
>>   include/linux/cper.h        |  54 ++++++++++++++++++
>>   2 files changed, 187 insertions(+)
>>
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index 8fa4e23..56aa516 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>>   static const char * const proc_type_strs[] = {
>>   	"IA32/X64",
>>   	"IA64",
>> +	"ARM",
>>   };
>>   
>>   static const char * const proc_isa_strs[] = {
>>   	"IA32",
>>   	"IA64",
>>   	"X64",
>> +	"ARM A32/T32",
>> +	"ARM A64",
>>   };
>>   
>>   static const char * const proc_error_type_strs[] = {
>> @@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>>   	"corrected",
>>   };
>>   
>> +static const char * const arm_reg_ctx_strs[] = {
>> +	"AArch32 general purpose registers",
>> +	"AArch32 EL1 context registers",
>> +	"AArch32 EL2 context registers",
>> +	"AArch32 secure context registers",
>> +	"AArch64 general purpose registers",
>> +	"AArch64 EL1 context registers",
>> +	"AArch64 EL2 context registers",
>> +	"AArch64 EL3 context registers",
>> +	"Misc. system register structure",
>> +};
> That...
>
>> +
>>   static void cper_print_proc_generic(const char *pfx,
>>   				    const struct cper_sec_proc_generic *proc)
>>   {
>> @@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
>>   		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
>>   }
>>   
>> +static void cper_print_proc_arm(const char *pfx,
>> +				const struct cper_sec_proc_arm *proc)
> ... and that function should go into:
>
> #if defined(CONFIG_ARM64) || defined(CONFIG_ARM)
>
> Just put them close together so that you don't have too much ifdeffery.
Hello Boris,

I will move them close together and add the ifdef.

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 03/10] efi: parse ARM processor error
@ 2017-04-13 20:32       ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 20:32 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

On 4/12/2017 10:51 AM, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:33PM -0600, Tyler Baicar wrote:
>> Add support for ARM Common Platform Error Record (CPER).
>> UEFI 2.6 specification adds support for ARM specific
>> processor error information to be reported as part of the
>> CPER records. This provides more detail on for processor error logs.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>   drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
>>   include/linux/cper.h        |  54 ++++++++++++++++++
>>   2 files changed, 187 insertions(+)
>>
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index 8fa4e23..56aa516 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>>   static const char * const proc_type_strs[] = {
>>   	"IA32/X64",
>>   	"IA64",
>> +	"ARM",
>>   };
>>   
>>   static const char * const proc_isa_strs[] = {
>>   	"IA32",
>>   	"IA64",
>>   	"X64",
>> +	"ARM A32/T32",
>> +	"ARM A64",
>>   };
>>   
>>   static const char * const proc_error_type_strs[] = {
>> @@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>>   	"corrected",
>>   };
>>   
>> +static const char * const arm_reg_ctx_strs[] = {
>> +	"AArch32 general purpose registers",
>> +	"AArch32 EL1 context registers",
>> +	"AArch32 EL2 context registers",
>> +	"AArch32 secure context registers",
>> +	"AArch64 general purpose registers",
>> +	"AArch64 EL1 context registers",
>> +	"AArch64 EL2 context registers",
>> +	"AArch64 EL3 context registers",
>> +	"Misc. system register structure",
>> +};
> That...
>
>> +
>>   static void cper_print_proc_generic(const char *pfx,
>>   				    const struct cper_sec_proc_generic *proc)
>>   {
>> @@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
>>   		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
>>   }
>>   
>> +static void cper_print_proc_arm(const char *pfx,
>> +				const struct cper_sec_proc_arm *proc)
> ... and that function should go into:
>
> #if defined(CONFIG_ARM64) || defined(CONFIG_ARM)
>
> Just put them close together so that you don't have too much ifdeffery.
Hello Boris,

I will move them close together and add the ifdef.

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 03/10] efi: parse ARM processor error
@ 2017-04-13 20:32       ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 20:32 UTC (permalink / raw)
  To: linux-arm-kernel

On 4/12/2017 10:51 AM, Borislav Petkov wrote:
> On Tue, Mar 28, 2017 at 01:30:33PM -0600, Tyler Baicar wrote:
>> Add support for ARM Common Platform Error Record (CPER).
>> UEFI 2.6 specification adds support for ARM specific
>> processor error information to be reported as part of the
>> CPER records. This provides more detail on for processor error logs.
>>
>> Signed-off-by: Tyler Baicar <tbaicar@codeaurora.org>
>> CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
>> Reviewed-by: James Morse <james.morse@arm.com>
>> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>   drivers/firmware/efi/cper.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
>>   include/linux/cper.h        |  54 ++++++++++++++++++
>>   2 files changed, 187 insertions(+)
>>
>> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
>> index 8fa4e23..56aa516 100644
>> --- a/drivers/firmware/efi/cper.c
>> +++ b/drivers/firmware/efi/cper.c
>> @@ -110,12 +110,15 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>>   static const char * const proc_type_strs[] = {
>>   	"IA32/X64",
>>   	"IA64",
>> +	"ARM",
>>   };
>>   
>>   static const char * const proc_isa_strs[] = {
>>   	"IA32",
>>   	"IA64",
>>   	"X64",
>> +	"ARM A32/T32",
>> +	"ARM A64",
>>   };
>>   
>>   static const char * const proc_error_type_strs[] = {
>> @@ -139,6 +142,18 @@ void cper_print_bits(const char *pfx, unsigned int bits,
>>   	"corrected",
>>   };
>>   
>> +static const char * const arm_reg_ctx_strs[] = {
>> +	"AArch32 general purpose registers",
>> +	"AArch32 EL1 context registers",
>> +	"AArch32 EL2 context registers",
>> +	"AArch32 secure context registers",
>> +	"AArch64 general purpose registers",
>> +	"AArch64 EL1 context registers",
>> +	"AArch64 EL2 context registers",
>> +	"AArch64 EL3 context registers",
>> +	"Misc. system register structure",
>> +};
> That...
>
>> +
>>   static void cper_print_proc_generic(const char *pfx,
>>   				    const struct cper_sec_proc_generic *proc)
>>   {
>> @@ -184,6 +199,114 @@ static void cper_print_proc_generic(const char *pfx,
>>   		printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
>>   }
>>   
>> +static void cper_print_proc_arm(const char *pfx,
>> +				const struct cper_sec_proc_arm *proc)
> ... and that function should go into:
>
> #if defined(CONFIG_ARM64) || defined(CONFIG_ARM)
>
> Just put them close together so that you don't have too much ifdeffery.
Hello Boris,

I will move them close together and add the ifdef.

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  2017-04-13 20:30         ` Baicar, Tyler
  (?)
@ 2017-04-13 20:47           ` Borislav Petkov
  -1 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-13 20:47 UTC (permalink / raw)
  To: Baicar, Tyler
  Cc: linux-efi, kvm, matt, catalin.marinas, will.deacon, robert.moore,
	paul.gortmaker, lv.zheng, kvmarm, fu.wei, zjzhang, linux,
	gengdongjiu, linux-acpi, eun.taik.lee, shijie.huang, labbott,
	lenb, harba, john.garry, marc.zyngier, punit.agrawal, rostedt,
	nkaje, sandeepa.s.prabhu, linux-arm-kernel, devel, rjw, rruigrok,
	linux-kernel, astone, hanjun.guo, joe, pbonzini, akpm, bristot,
	shiju.jose

On Thu, Apr 13, 2017 at 02:30:21PM -0600, Baicar, Tyler wrote:
> I do not agree with this. The struct being passed to this function is
> already named acpi_hest_generic_data in the existing code and all over this
> code is named gdata not just d.

And I'm saying they're too long - the preexisting ones and the ones
you're adding - and impair readability. This whole driver is one
unreadable ugly pile and if I were the maintainer I would never allowed
it in its current form.

But I don't think it really has a maintainer - poor Rafael has to deal
with it because it is under drivers/acpi/ and that whole RAS firmware
crap got thrown over the wall at some point and now we're stuck with it.

So this is just my opinion since he asked me to take a look.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-13 20:47           ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-13 20:47 UTC (permalink / raw)
  To: Baicar, Tyler
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On Thu, Apr 13, 2017 at 02:30:21PM -0600, Baicar, Tyler wrote:
> I do not agree with this. The struct being passed to this function is
> already named acpi_hest_generic_data in the existing code and all over this
> code is named gdata not just d.

And I'm saying they're too long - the preexisting ones and the ones
you're adding - and impair readability. This whole driver is one
unreadable ugly pile and if I were the maintainer I would never allowed
it in its current form.

But I don't think it really has a maintainer - poor Rafael has to deal
with it because it is under drivers/acpi/ and that whole RAS firmware
crap got thrown over the wall at some point and now we're stuck with it.

So this is just my opinion since he asked me to take a look.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-13 20:47           ` Borislav Petkov
  0 siblings, 0 replies; 80+ messages in thread
From: Borislav Petkov @ 2017-04-13 20:47 UTC (permalink / raw)
  To: linux-arm-kernel

On Thu, Apr 13, 2017 at 02:30:21PM -0600, Baicar, Tyler wrote:
> I do not agree with this. The struct being passed to this function is
> already named acpi_hest_generic_data in the existing code and all over this
> code is named gdata not just d.

And I'm saying they're too long - the preexisting ones and the ones
you're adding - and impair readability. This whole driver is one
unreadable ugly pile and if I were the maintainer I would never allowed
it in its current form.

But I don't think it really has a maintainer - poor Rafael has to deal
with it because it is under drivers/acpi/ and that whole RAS firmware
crap got thrown over the wall at some point and now we're stuck with it.

So this is just my opinion since he asked me to take a look.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
  2017-04-13 20:47           ` Borislav Petkov
  (?)
  (?)
@ 2017-04-13 21:33             ` Baicar, Tyler
  -1 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 21:33 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

On 4/13/2017 2:47 PM, Borislav Petkov wrote:
> On Thu, Apr 13, 2017 at 02:30:21PM -0600, Baicar, Tyler wrote:
>> I do not agree with this. The struct being passed to this function is
>> already named acpi_hest_generic_data in the existing code and all over this
>> code is named gdata not just d.
> And I'm saying they're too long - the preexisting ones and the ones
> you're adding - and impair readability. This whole driver is one
> unreadable ugly pile and if I were the maintainer I would never allowed
> it in its current form.
>
> But I don't think it really has a maintainer - poor Rafael has to deal
> with it because it is under drivers/acpi/ and that whole RAS firmware
> crap got thrown over the wall at some point and now we're stuck with it.
>
> So this is just my opinion since he asked me to take a look.
Okay, that makes sense. I'd prefer to avoid completely re-writing the 
existing code in this patch set :)

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-13 21:33             ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 21:33 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi, devel,
	Suzuki.Poulose, punit.agrawal, astone, harba, hanjun.guo,
	john.garry, shiju.jose, joe, gengdongjiu, xiexiuqi

On 4/13/2017 2:47 PM, Borislav Petkov wrote:
> On Thu, Apr 13, 2017 at 02:30:21PM -0600, Baicar, Tyler wrote:
>> I do not agree with this. The struct being passed to this function is
>> already named acpi_hest_generic_data in the existing code and all over this
>> code is named gdata not just d.
> And I'm saying they're too long - the preexisting ones and the ones
> you're adding - and impair readability. This whole driver is one
> unreadable ugly pile and if I were the maintainer I would never allowed
> it in its current form.
>
> But I don't think it really has a maintainer - poor Rafael has to deal
> with it because it is under drivers/acpi/ and that whole RAS firmware
> crap got thrown over the wall at some point and now we're stuck with it.
>
> So this is just my opinion since he asked me to take a look.
Okay, that makes sense. I'd prefer to avoid completely re-writing the 
existing code in this patch set :)

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* Re: [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-13 21:33             ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 21:33 UTC (permalink / raw)
  To: Borislav Petkov
  Cc: christoffer.dall, marc.zyngier, pbonzini, rkrcmar, linux,
	catalin.marinas, will.deacon, rjw, lenb, matt, robert.moore,
	lv.zheng, nkaje, zjzhang, mark.rutland, james.morse, akpm,
	eun.taik.lee, sandeepa.s.prabhu, labbott, shijie.huang, rruigrok,
	paul.gortmaker, tn, fu.wei, rostedt, bristot, linux-arm-kernel,
	kvmarm, kvm, linux-kernel, linux-acpi, linux-efi

On 4/13/2017 2:47 PM, Borislav Petkov wrote:
> On Thu, Apr 13, 2017 at 02:30:21PM -0600, Baicar, Tyler wrote:
>> I do not agree with this. The struct being passed to this function is
>> already named acpi_hest_generic_data in the existing code and all over this
>> code is named gdata not just d.
> And I'm saying they're too long - the preexisting ones and the ones
> you're adding - and impair readability. This whole driver is one
> unreadable ugly pile and if I were the maintainer I would never allowed
> it in its current form.
>
> But I don't think it really has a maintainer - poor Rafael has to deal
> with it because it is under drivers/acpi/ and that whole RAS firmware
> crap got thrown over the wall at some point and now we're stuck with it.
>
> So this is just my opinion since he asked me to take a look.
Okay, that makes sense. I'd prefer to avoid completely re-writing the 
existing code in this patch set :)

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
* [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1
@ 2017-04-13 21:33             ` Baicar, Tyler
  0 siblings, 0 replies; 80+ messages in thread
From: Baicar, Tyler @ 2017-04-13 21:33 UTC (permalink / raw)
  To: linux-arm-kernel

On 4/13/2017 2:47 PM, Borislav Petkov wrote:
> On Thu, Apr 13, 2017 at 02:30:21PM -0600, Baicar, Tyler wrote:
>> I do not agree with this. The struct being passed to this function is
>> already named acpi_hest_generic_data in the existing code and all over this
>> code is named gdata not just d.
> And I'm saying they're too long - the preexisting ones and the ones
> you're adding - and impair readability. This whole driver is one
> unreadable ugly pile and if I were the maintainer I would never allowed
> it in its current form.
>
> But I don't think it really has a maintainer - poor Rafael has to deal
> with it because it is under drivers/acpi/ and that whole RAS firmware
> crap got thrown over the wall at some point and now we're stuck with it.
>
> So this is just my opinion since he asked me to take a look.
Okay, that makes sense. I'd prefer to avoid completely re-writing the 
existing code in this patch set :)

Thanks,
Tyler

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.

^ permalink raw reply	[flat|nested] 80+ messages in thread
end of thread, other threads:[~2017-04-13 21:33 UTC | newest]

Thread overview: 80+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-03-28 19:30 [PATCH V14 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64 Tyler Baicar
2017-03-28 19:30 ` Tyler Baicar
2017-03-28 19:30 ` Tyler Baicar
2017-03-28 19:30 ` [PATCH V14 01/10] acpi: apei: read ack upon ghes record consumption Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
     [not found]   ` <1490729440-32591-2-git-send-email-tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-04-11 17:15     ` Borislav Petkov
2017-04-11 17:15       ` Borislav Petkov
2017-04-11 17:15       ` Borislav Petkov
2017-04-11 17:15       ` Borislav Petkov
2017-04-13 19:45       ` Baicar, Tyler
2017-04-13 19:45         ` Baicar, Tyler
2017-04-13 19:45         ` Baicar, Tyler
2017-04-13 19:45         ` Baicar, Tyler
2017-03-28 19:30 ` [PATCH V14 02/10] ras: acpi/apei: cper: generic error data entry v3 per ACPI 6.1 Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-04-12 13:34   ` Borislav Petkov
2017-04-12 13:34     ` Borislav Petkov
2017-04-12 13:34     ` Borislav Petkov
2017-04-12 13:34     ` Borislav Petkov
2017-04-12 16:40     ` Joe Perches
2017-04-12 16:40       ` Joe Perches
2017-04-12 16:40       ` Joe Perches
     [not found]     ` <20170412133447.n2yft7v266v6k6gh-fF5Pk5pvG8Y@public.gmane.org>
2017-04-13 20:30       ` Baicar, Tyler
2017-04-13 20:30         ` Baicar, Tyler
2017-04-13 20:30         ` Baicar, Tyler
2017-04-13 20:30         ` Baicar, Tyler
2017-04-13 20:47         ` Borislav Petkov
2017-04-13 20:47           ` Borislav Petkov
2017-04-13 20:47           ` Borislav Petkov
2017-04-13 21:33           ` Baicar, Tyler
2017-04-13 21:33             ` Baicar, Tyler
2017-04-13 21:33             ` Baicar, Tyler
2017-04-13 21:33             ` Baicar, Tyler
2017-03-28 19:30 ` [PATCH V14 03/10] efi: parse ARM processor error Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-04-12 16:51   ` Borislav Petkov
2017-04-12 16:51     ` Borislav Petkov
2017-04-12 16:51     ` Borislav Petkov
2017-04-12 16:51     ` Borislav Petkov
2017-04-13 20:32     ` Baicar, Tyler
2017-04-13 20:32       ` Baicar, Tyler
2017-04-13 20:32       ` Baicar, Tyler
2017-04-13 20:32       ` Baicar, Tyler
2017-03-28 19:30 ` [PATCH V14 04/10] arm64: exception: handle Synchronous External Abort Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30 ` [PATCH V14 05/10] acpi: apei: handle SEA notification type for ARMv8 Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30 ` [PATCH V14 06/10] acpi: apei: panic OS with fatal error status block Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30 ` [PATCH V14 07/10] efi: print unrecognized CPER section Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30 ` [PATCH V14 08/10] ras: acpi / apei: generate trace event for " Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30 ` [PATCH V14 09/10] trace, ras: add ARM processor error trace event Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30 ` [PATCH V14 10/10] arm/arm64: KVM: add guest SEA support Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 19:30   ` Tyler Baicar
2017-03-28 20:26   ` Christoffer Dall
2017-03-28 20:26     ` Christoffer Dall
2017-03-28 20:26     ` Christoffer Dall
2017-03-28 21:33     ` Baicar, Tyler
2017-03-28 21:33       ` Baicar, Tyler
2017-03-28 21:33       ` Baicar, Tyler
2017-03-28 22:18       ` Christoffer Dall
2017-03-28 22:18         ` Christoffer Dall
2017-03-28 22:18         ` Christoffer Dall
     [not found] ` <1490729440-32591-1-git-send-email-tbaicar-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2017-04-06 17:12   ` [PATCH V14 00/10] Add UEFI 2.6 and ACPI 6.1 updates for RAS on ARM64 Catalin Marinas
2017-04-06 17:12     ` Catalin Marinas
2017-04-06 17:12     ` Catalin Marinas

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.