[PATCH v4 00/13] Enable ACPI on ARM64 in Kconfig

[PATCH v4 00/13] Enable ACPI on ARM64 in Kconfig

[Hanjun Guo]

This patch set is the first part of ARM64 ACPI core patches to
running ACPI on ARM64, it just handle some compile errors when
ACPI is introduced to ARM64 platform and enable ACPI on ARM64
in Kconfig.

Following core patch sets for ACPI based SMP/GIC/Arch Timer
initialization to enable ACPI on ARM64 are under interally
review and will send out when ACPI 5.1 is released.

patch 1~3 are cleanups for ACPI core;
patch 4~13 are arch dependent code for ARM64 ACPI;

This patch set is based on linux-next branch of Rafael's linux-pm
tree, and PCI patches for ARM64 from Liviu:
Support for creating generic host_bridge from device tree
https://lkml.org/lkml/2014/3/14/279

Add support for PCI in AArch64
http://comments.gmane.org/gmane.linux.ports.arm.kernel/309392

Changes since v3:
- Introduce three new patches
	- acpi: arm64 does not have a BIOS add config for BIOS table scan
	- ACPI: Don't use acpi_lapic in ACPI core code
	- ARM64 / ACPI: if we chose to boot from acpi then disable FDT
- Rebase on the latest linux-next branch of Rafael's tree, and
  introduce asm/acenv.h for ARM64;
- Introduce ARCH_HAS_ACPI_PDC to move all the _PDC related code
  to a single place and make x86 and ia64 select ARCH_HAS_ACPI_PDC;
- Fix some checpatch warning;
- Fix broken Signed-off-by chain;
- Remove duplicate interface macros for ACPICA pointed out by Mark
  Rutland and Zheng Lv;
- Redefine ACPI_FLUSH_CPU_CACHE();
- Stub out some PCI functions suggested by Arnd and already merged into 3.16

Comments still need to be addressed:
	- Empty PCI implementation in arch/arm64 which suggested by Arnd;
	- suspend and sleep on ARM64 platform pointed out by Lorenzo;

Changes since v2:
- Make ACPI depend on PCI on ARM64
- rework all the patches and seperate some of the patches
  into fine-grained, and add some comments and changelog to
  make it easier for review.

Al Stone (3):
  ARM64 / ACPI: Introduce arm-core.c and its related head file
  ARM64 / ACPI: Introduce early_param for "acpi"
  ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on
    ARM64

Graeme Gregory (6):
  acpi: arm64 does not have a BIOS add config for BIOS table scan.
  ACPI: Don't use acpi_lapic in ACPI core code
  ARM64 : Add dummy asm/cpu.h
  ARM64 / ACPI: Introduce lowlevel suspend function
  ARM64 / ACPI: if we chose to boot from acpi then disable FDT
  ARM64 / ACPI: Enable ARM64 in Kconfig

Hanjun Guo (4):
  ACPI / processor: Introduce ARCH_HAS_ACPI_PDC
  ARM64 / ACPI: Introduce arch_fix_phys_package_id() for cpu topology
  ARM64 / ACPI: Introduce PCI functions for ACPI on ARM64
  ACPI: Make EC debugfs depend on X86 || IA64 in Kconfig

 Documentation/kernel-parameters.txt |    3 +-
 arch/arm64/Kconfig                  |    3 +
 arch/arm64/include/asm/acenv.h      |   18 +++
 arch/arm64/include/asm/acpi.h       |   61 +++++++++++
 arch/arm64/include/asm/cpu.h        |   11 ++
 arch/arm64/include/asm/pci.h        |    6 +
 arch/arm64/include/asm/topology.h   |    2 +
 arch/arm64/kernel/pci.c             |   28 +++++
 arch/arm64/kernel/setup.c           |    7 +-
 arch/arm64/kernel/topology.c        |   14 +++
 arch/ia64/Kconfig                   |    2 +
 arch/ia64/include/asm/acpi.h        |    5 +
 arch/x86/Kconfig                    |    2 +
 arch/x86/include/asm/acpi.h         |    5 +
 drivers/acpi/Kconfig                |   19 +++-
 drivers/acpi/Makefile               |    3 +
 drivers/acpi/acpi_processor.c       |    2 +-
 drivers/acpi/internal.h             |    5 +
 drivers/acpi/osl.c                  |    4 +-
 drivers/acpi/plat/Makefile          |    1 +
 drivers/acpi/plat/arm-core.c        |  138 +++++++++++++++++++++++
 drivers/acpi/processor_core.c       |  198 ---------------------------------
 drivers/acpi/processor_pdc.c        |  206 +++++++++++++++++++++++++++++++++++
 23 files changed, 539 insertions(+), 204 deletions(-)
 create mode 100644 arch/arm64/include/asm/acenv.h
 create mode 100644 arch/arm64/include/asm/acpi.h
 create mode 100644 arch/arm64/include/asm/cpu.h
 create mode 100644 drivers/acpi/plat/Makefile
 create mode 100644 drivers/acpi/plat/arm-core.c
 create mode 100644 drivers/acpi/processor_pdc.c

-- 
1.7.9.5

[PATCH v4 00/13] Enable ACPI on ARM64 in Kconfig

[Hanjun Guo]

This patch set is the first part of ARM64 ACPI core patches to
running ACPI on ARM64, it just handle some compile errors when
ACPI is introduced to ARM64 platform and enable ACPI on ARM64
in Kconfig.

Following core patch sets for ACPI based SMP/GIC/Arch Timer
initialization to enable ACPI on ARM64 are under interally
review and will send out when ACPI 5.1 is released.

patch 1~3 are cleanups for ACPI core;
patch 4~13 are arch dependent code for ARM64 ACPI;

This patch set is based on linux-next branch of Rafael's linux-pm
tree, and PCI patches for ARM64 from Liviu:
Support for creating generic host_bridge from device tree
https://lkml.org/lkml/2014/3/14/279

Add support for PCI in AArch64
http://comments.gmane.org/gmane.linux.ports.arm.kernel/309392

Changes since v3:
- Introduce three new patches
	- acpi: arm64 does not have a BIOS add config for BIOS table scan
	- ACPI: Don't use acpi_lapic in ACPI core code
	- ARM64 / ACPI: if we chose to boot from acpi then disable FDT
- Rebase on the latest linux-next branch of Rafael's tree, and
  introduce asm/acenv.h for ARM64;
- Introduce ARCH_HAS_ACPI_PDC to move all the _PDC related code
  to a single place and make x86 and ia64 select ARCH_HAS_ACPI_PDC;
- Fix some checpatch warning;
- Fix broken Signed-off-by chain;
- Remove duplicate interface macros for ACPICA pointed out by Mark
  Rutland and Zheng Lv;
- Redefine ACPI_FLUSH_CPU_CACHE();
- Stub out some PCI functions suggested by Arnd and already merged into 3.16

Comments still need to be addressed:
	- Empty PCI implementation in arch/arm64 which suggested by Arnd;
	- suspend and sleep on ARM64 platform pointed out by Lorenzo;

Changes since v2:
- Make ACPI depend on PCI on ARM64
- rework all the patches and seperate some of the patches
  into fine-grained, and add some comments and changelog to
  make it easier for review.

Al Stone (3):
  ARM64 / ACPI: Introduce arm-core.c and its related head file
  ARM64 / ACPI: Introduce early_param for "acpi"
  ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on
    ARM64

Graeme Gregory (6):
  acpi: arm64 does not have a BIOS add config for BIOS table scan.
  ACPI: Don't use acpi_lapic in ACPI core code
  ARM64 : Add dummy asm/cpu.h
  ARM64 / ACPI: Introduce lowlevel suspend function
  ARM64 / ACPI: if we chose to boot from acpi then disable FDT
  ARM64 / ACPI: Enable ARM64 in Kconfig

Hanjun Guo (4):
  ACPI / processor: Introduce ARCH_HAS_ACPI_PDC
  ARM64 / ACPI: Introduce arch_fix_phys_package_id() for cpu topology
  ARM64 / ACPI: Introduce PCI functions for ACPI on ARM64
  ACPI: Make EC debugfs depend on X86 || IA64 in Kconfig

 Documentation/kernel-parameters.txt |    3 +-
 arch/arm64/Kconfig                  |    3 +
 arch/arm64/include/asm/acenv.h      |   18 +++
 arch/arm64/include/asm/acpi.h       |   61 +++++++++++
 arch/arm64/include/asm/cpu.h        |   11 ++
 arch/arm64/include/asm/pci.h        |    6 +
 arch/arm64/include/asm/topology.h   |    2 +
 arch/arm64/kernel/pci.c             |   28 +++++
 arch/arm64/kernel/setup.c           |    7 +-
 arch/arm64/kernel/topology.c        |   14 +++
 arch/ia64/Kconfig                   |    2 +
 arch/ia64/include/asm/acpi.h        |    5 +
 arch/x86/Kconfig                    |    2 +
 arch/x86/include/asm/acpi.h         |    5 +
 drivers/acpi/Kconfig                |   19 +++-
 drivers/acpi/Makefile               |    3 +
 drivers/acpi/acpi_processor.c       |    2 +-
 drivers/acpi/internal.h             |    5 +
 drivers/acpi/osl.c                  |    4 +-
 drivers/acpi/plat/Makefile          |    1 +
 drivers/acpi/plat/arm-core.c        |  138 +++++++++++++++++++++++
 drivers/acpi/processor_core.c       |  198 ---------------------------------
 drivers/acpi/processor_pdc.c        |  206 +++++++++++++++++++++++++++++++++++
 23 files changed, 539 insertions(+), 204 deletions(-)
 create mode 100644 arch/arm64/include/asm/acenv.h
 create mode 100644 arch/arm64/include/asm/acpi.h
 create mode 100644 arch/arm64/include/asm/cpu.h
 create mode 100644 drivers/acpi/plat/Makefile
 create mode 100644 drivers/acpi/plat/arm-core.c
 create mode 100644 drivers/acpi/processor_pdc.c

-- 
1.7.9.5

[PATCH v4 01/13] acpi: arm64 does not have a BIOS add config for BIOS table scan.

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

With the addition of ARM64 that does not have a traditional BIOS to
scan, add a config option which is selected on x86 and ia64 to do
the traditional BIOS scanning for tables.

Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
---
 arch/ia64/Kconfig    |    1 +
 arch/x86/Kconfig     |    1 +
 drivers/acpi/Kconfig |    3 +++
 drivers/acpi/osl.c   |    4 +++-
 4 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 2f3abcf..f82b352 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -47,6 +47,7 @@ config IA64
 	select MODULES_USE_ELF_RELA
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_AUDITSYSCALL
+	select ACPI_SCAN_BIOS_NOT_EFI
 	default y
 	help
 	  The Itanium Processor Family is Intel's 64-bit successor to
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a8f749e..4865d44 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -131,6 +131,7 @@ config X86
 	select HAVE_CC_STACKPROTECTOR
 	select GENERIC_CPU_AUTOPROBE
 	select HAVE_ARCH_AUDITSYSCALL
+	select ACPI_SCAN_BIOS_NOT_EFI
 
 config INSTRUCTION_DECODER
 	def_bool y
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index a34a228..70eaf7a 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -2,6 +2,9 @@
 # ACPI Configuration
 #
 
+config ACPI_SCAN_BIOS_NOT_EFI
+	bool
+
 menuconfig ACPI
 	bool "ACPI (Advanced Configuration and Power Interface) Support"
 	depends on !IA64_HP_SIM
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index bad25b0..5ba0b74 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -259,12 +259,14 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
 			       "System description tables not found\n");
 			return 0;
 		}
-	} else {
+	} else if (IS_ENABLED(CONFIG_ACPI_SCAN_BIOS_NOT_EFI)) {
 		acpi_physical_address pa = 0;
 
 		acpi_find_root_pointer(&pa);
 		return pa;
 	}
+
+	return 0;
 }
 
 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
-- 
1.7.9.5

[PATCH v4 01/13] acpi: arm64 does not have a BIOS add config for BIOS table scan.

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

With the addition of ARM64 that does not have a traditional BIOS to
scan, add a config option which is selected on x86 and ia64 to do
the traditional BIOS scanning for tables.

Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
---
 arch/ia64/Kconfig    |    1 +
 arch/x86/Kconfig     |    1 +
 drivers/acpi/Kconfig |    3 +++
 drivers/acpi/osl.c   |    4 +++-
 4 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 2f3abcf..f82b352 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -47,6 +47,7 @@ config IA64
 	select MODULES_USE_ELF_RELA
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select HAVE_ARCH_AUDITSYSCALL
+	select ACPI_SCAN_BIOS_NOT_EFI
 	default y
 	help
 	  The Itanium Processor Family is Intel's 64-bit successor to
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a8f749e..4865d44 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -131,6 +131,7 @@ config X86
 	select HAVE_CC_STACKPROTECTOR
 	select GENERIC_CPU_AUTOPROBE
 	select HAVE_ARCH_AUDITSYSCALL
+	select ACPI_SCAN_BIOS_NOT_EFI
 
 config INSTRUCTION_DECODER
 	def_bool y
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index a34a228..70eaf7a 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -2,6 +2,9 @@
 # ACPI Configuration
 #
 
+config ACPI_SCAN_BIOS_NOT_EFI
+	bool
+
 menuconfig ACPI
 	bool "ACPI (Advanced Configuration and Power Interface) Support"
 	depends on !IA64_HP_SIM
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index bad25b0..5ba0b74 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -259,12 +259,14 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
 			       "System description tables not found\n");
 			return 0;
 		}
-	} else {
+	} else if (IS_ENABLED(CONFIG_ACPI_SCAN_BIOS_NOT_EFI)) {
 		acpi_physical_address pa = 0;
 
 		acpi_find_root_pointer(&pa);
 		return pa;
 	}
+
+	return 0;
 }
 
 /* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
-- 
1.7.9.5

[PATCH v4 02/13] ACPI: Don't use acpi_lapic in ACPI core code

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

Now ARM64 support is being added to ACPI so architecture specific
values can not be used in core ACPI code.

Following on the patch "ACPI / processor: Check if LAPIC is present
during initialization" which uses acpi_lapic in acpi_processor.c,
on ARM64 platform, GIC is used instead of local APIC, so acpi_lapic
is not a suitable value for ARM64.

What is actually important at this point is the SMPness of the system,
so introduce acpi_arch_is_smp() to be arch specific and generic.

Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/ia64/include/asm/acpi.h  |    5 +++++
 arch/x86/include/asm/acpi.h   |    5 +++++
 drivers/acpi/acpi_processor.c |    2 +-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
index 75dc59a..2fc0757 100644
--- a/arch/ia64/include/asm/acpi.h
+++ b/arch/ia64/include/asm/acpi.h
@@ -40,6 +40,11 @@ extern int acpi_lapic;
 #define acpi_noirq 0	/* ACPI always enabled on IA64 */
 #define acpi_pci_disabled 0 /* ACPI PCI always enabled on IA64 */
 #define acpi_strict 1	/* no ACPI spec workarounds on IA64 */
+
+static inline bool acpi_arch_is_smp(void)
+{
+	return acpi_lapic;
+}
 #endif
 #define acpi_processor_cstate_check(x) (x) /* no idle limits on IA64 :) */
 static inline void disable_acpi(void) { }
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index e06225e..939d377 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -121,6 +121,11 @@ static inline void arch_acpi_set_pdc_bits(u32 *buf)
 		buf[2] &= ~(ACPI_PDC_C_C2C3_FFH);
 }
 
+static inline bool acpi_arch_is_smp(void)
+{
+	return acpi_lapic;
+}
+
 #else /* !CONFIG_ACPI */
 
 #define acpi_lapic 0
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 1c08574..8622a0e 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -268,7 +268,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
 	pr->apic_id = apic_id;
 
 	cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
-	if (!cpu0_initialized && !acpi_lapic) {
+	if (!cpu0_initialized && !acpi_arch_is_smp()) {
 		cpu0_initialized = 1;
 		/* Handle UP system running SMP kernel, with no LAPIC in MADT */
 		if ((cpu_index == -1) && (num_online_cpus() == 1))
-- 
1.7.9.5

[PATCH v4 02/13] ACPI: Don't use acpi_lapic in ACPI core code

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

Now ARM64 support is being added to ACPI so architecture specific
values can not be used in core ACPI code.

Following on the patch "ACPI / processor: Check if LAPIC is present
during initialization" which uses acpi_lapic in acpi_processor.c,
on ARM64 platform, GIC is used instead of local APIC, so acpi_lapic
is not a suitable value for ARM64.

What is actually important at this point is the SMPness of the system,
so introduce acpi_arch_is_smp() to be arch specific and generic.

Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/ia64/include/asm/acpi.h  |    5 +++++
 arch/x86/include/asm/acpi.h   |    5 +++++
 drivers/acpi/acpi_processor.c |    2 +-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
index 75dc59a..2fc0757 100644
--- a/arch/ia64/include/asm/acpi.h
+++ b/arch/ia64/include/asm/acpi.h
@@ -40,6 +40,11 @@ extern int acpi_lapic;
 #define acpi_noirq 0	/* ACPI always enabled on IA64 */
 #define acpi_pci_disabled 0 /* ACPI PCI always enabled on IA64 */
 #define acpi_strict 1	/* no ACPI spec workarounds on IA64 */
+
+static inline bool acpi_arch_is_smp(void)
+{
+	return acpi_lapic;
+}
 #endif
 #define acpi_processor_cstate_check(x) (x) /* no idle limits on IA64 :) */
 static inline void disable_acpi(void) { }
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index e06225e..939d377 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -121,6 +121,11 @@ static inline void arch_acpi_set_pdc_bits(u32 *buf)
 		buf[2] &= ~(ACPI_PDC_C_C2C3_FFH);
 }
 
+static inline bool acpi_arch_is_smp(void)
+{
+	return acpi_lapic;
+}
+
 #else /* !CONFIG_ACPI */
 
 #define acpi_lapic 0
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 1c08574..8622a0e 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -268,7 +268,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
 	pr->apic_id = apic_id;
 
 	cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
-	if (!cpu0_initialized && !acpi_lapic) {
+	if (!cpu0_initialized && !acpi_arch_is_smp()) {
 		cpu0_initialized = 1;
 		/* Handle UP system running SMP kernel, with no LAPIC in MADT */
 		if ((cpu_index == -1) && (num_online_cpus() == 1))
-- 
1.7.9.5

[PATCH v4 03/13] ACPI / processor: Introduce ARCH_HAS_ACPI_PDC

[Hanjun Guo]

The use of _PDC is deprecated in ACPI 3.0 in favor of _OSC,
as ARM platform is supported only in ACPI 5.0 or higher version,
_PDC will not be used in ARM platform, so make Make _PDC only for
platforms with Intel CPUs.

Introduce ARCH_HAS_ACPI_PDC and move _PDC related code in ACPI
processor driver into a single file processor_pdc.c, make x86
and ia64 select ARCH_HAS_ACPI_PDC when ACPI is enabled.

This patch also use pr_* to replace printk to fix the checkpatch
warning and factor acpi_processor_alloc_pdc() a little bit to
avoid duplicate pr_err() code.

Suggested-by: Robert Richter <rric@kernel.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/ia64/Kconfig             |    1 +
 arch/x86/Kconfig              |    1 +
 drivers/acpi/Kconfig          |   10 ++
 drivers/acpi/Makefile         |    1 +
 drivers/acpi/internal.h       |    5 +
 drivers/acpi/processor_core.c |  198 ---------------------------------------
 drivers/acpi/processor_pdc.c  |  206 +++++++++++++++++++++++++++++++++++++++++
 7 files changed, 224 insertions(+), 198 deletions(-)
 create mode 100644 drivers/acpi/processor_pdc.c

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index f82b352..cde2626 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -10,6 +10,7 @@ config IA64
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select PCI if (!IA64_HP_SIM)
 	select ACPI if (!IA64_HP_SIM)
+	select ARCH_HAS_ACPI_PDC if ACPI
 	select PM if (!IA64_HP_SIM)
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_IDE
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4865d44..d60cec7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -21,6 +21,7 @@ config X86_64
 ### Arch settings
 config X86
 	def_bool y
+	select ARCH_HAS_ACPI_PDC if ACPI
 	select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 70eaf7a..0e6f72d 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -367,6 +367,16 @@ config ACPI_REDUCED_HARDWARE_ONLY
 
 	If you are unsure what to do, do not enable this option.
 
+config ARCH_HAS_ACPI_PDC
+	bool
+	help
+	  The _PDC object provides OSPM a mechanism to convey to the platform
+	  the capabilities supported by OSPM for processor power management.
+	  This allows the platform to modify the ACPI namespace objects returning
+	  configuration information for processor power management based on the
+	  level of support provided by OSPM.The use of _PDC is deprecated in
+	  ACPI 3.0 in favor of _OSC.
+
 source "drivers/acpi/apei/Kconfig"
 
 config ACPI_EXTLOG
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index ea55e01..b638e95 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -36,6 +36,7 @@ acpi-y				+= scan.o
 acpi-y				+= resource.o
 acpi-y				+= acpi_processor.o
 acpi-y				+= processor_core.o
+acpi-$(CONFIG_ARCH_HAS_ACPI_PDC) += processor_pdc.o
 acpi-y				+= ec.o
 acpi-$(CONFIG_ACPI_DOCK)	+= dock.o
 acpi-y				+= pci_root.o pci_link.o pci_irq.o
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 7de5b60..d7376ee 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -108,7 +108,12 @@ int acpi_power_transition(struct acpi_device *device, int state);
 int acpi_device_update_power(struct acpi_device *device, int *state_p);
 
 int acpi_wakeup_device_init(void);
+
+#ifdef CONFIG_ARCH_HAS_ACPI_PDC
 void acpi_early_processor_set_pdc(void);
+#else
+static inline void acpi_early_processor_set_pdc(void) {}
+#endif
 
 /* --------------------------------------------------------------------------
                                   Embedded Controller
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 71e2065..00f48d1 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -4,17 +4,11 @@
  *
  *	Alex Chiang <achiang@hp.com>
  *	- Unified x86/ia64 implementations
- *	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
- *	- Added _PDC for platforms with Intel CPUs
  */
 #include <linux/export.h>
-#include <linux/dmi.h>
-#include <linux/slab.h>
 #include <linux/acpi.h>
 #include <acpi/processor.h>
 
-#include "internal.h"
-
 #define _COMPONENT		ACPI_PROCESSOR_COMPONENT
 ACPI_MODULE_NAME("processor_core");
 
@@ -208,195 +202,3 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 	return acpi_map_cpuid(apic_id, acpi_id);
 }
 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
-
-static bool __init processor_physically_present(acpi_handle handle)
-{
-	int cpuid, type;
-	u32 acpi_id;
-	acpi_status status;
-	acpi_object_type acpi_type;
-	unsigned long long tmp;
-	union acpi_object object = { 0 };
-	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
-
-	status = acpi_get_type(handle, &acpi_type);
-	if (ACPI_FAILURE(status))
-		return false;
-
-	switch (acpi_type) {
-	case ACPI_TYPE_PROCESSOR:
-		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
-		if (ACPI_FAILURE(status))
-			return false;
-		acpi_id = object.processor.proc_id;
-		break;
-	case ACPI_TYPE_DEVICE:
-		status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
-		if (ACPI_FAILURE(status))
-			return false;
-		acpi_id = tmp;
-		break;
-	default:
-		return false;
-	}
-
-	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
-	cpuid = acpi_get_cpuid(handle, type, acpi_id);
-
-	if (cpuid == -1)
-		return false;
-
-	return true;
-}
-
-static void acpi_set_pdc_bits(u32 *buf)
-{
-	buf[0] = ACPI_PDC_REVISION_ID;
-	buf[1] = 1;
-
-	/* Enable coordination with firmware's _TSD info */
-	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
-
-	/* Twiddle arch-specific bits needed for _PDC */
-	arch_acpi_set_pdc_bits(buf);
-}
-
-static struct acpi_object_list *acpi_processor_alloc_pdc(void)
-{
-	struct acpi_object_list *obj_list;
-	union acpi_object *obj;
-	u32 *buf;
-
-	/* allocate and initialize pdc. It will be used later. */
-	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
-	if (!obj_list) {
-		printk(KERN_ERR "Memory allocation error\n");
-		return NULL;
-	}
-
-	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
-	if (!obj) {
-		printk(KERN_ERR "Memory allocation error\n");
-		kfree(obj_list);
-		return NULL;
-	}
-
-	buf = kmalloc(12, GFP_KERNEL);
-	if (!buf) {
-		printk(KERN_ERR "Memory allocation error\n");
-		kfree(obj);
-		kfree(obj_list);
-		return NULL;
-	}
-
-	acpi_set_pdc_bits(buf);
-
-	obj->type = ACPI_TYPE_BUFFER;
-	obj->buffer.length = 12;
-	obj->buffer.pointer = (u8 *) buf;
-	obj_list->count = 1;
-	obj_list->pointer = obj;
-
-	return obj_list;
-}
-
-/*
- * _PDC is required for a BIOS-OS handshake for most of the newer
- * ACPI processor features.
- */
-static acpi_status
-acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
-{
-	acpi_status status = AE_OK;
-
-	if (boot_option_idle_override == IDLE_NOMWAIT) {
-		/*
-		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
-		 * mode will be disabled in the parameter of _PDC object.
-		 * Of course C1_FFH access mode will also be disabled.
-		 */
-		union acpi_object *obj;
-		u32 *buffer = NULL;
-
-		obj = pdc_in->pointer;
-		buffer = (u32 *)(obj->buffer.pointer);
-		buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
-
-	}
-	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
-
-	if (ACPI_FAILURE(status))
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-		    "Could not evaluate _PDC, using legacy perf. control.\n"));
-
-	return status;
-}
-
-void acpi_processor_set_pdc(acpi_handle handle)
-{
-	struct acpi_object_list *obj_list;
-
-	if (arch_has_acpi_pdc() == false)
-		return;
-
-	obj_list = acpi_processor_alloc_pdc();
-	if (!obj_list)
-		return;
-
-	acpi_processor_eval_pdc(handle, obj_list);
-
-	kfree(obj_list->pointer->buffer.pointer);
-	kfree(obj_list->pointer);
-	kfree(obj_list);
-}
-
-static acpi_status __init
-early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
-	if (processor_physically_present(handle) == false)
-		return AE_OK;
-
-	acpi_processor_set_pdc(handle);
-	return AE_OK;
-}
-
-#if defined(CONFIG_X86) || defined(CONFIG_IA64)
-static int __init set_no_mwait(const struct dmi_system_id *id)
-{
-	pr_notice(PREFIX "%s detected - disabling mwait for CPU C-states\n",
-		  id->ident);
-	boot_option_idle_override = IDLE_NOMWAIT;
-	return 0;
-}
-
-static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
-	{
-	set_no_mwait, "Extensa 5220", {
-	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
-	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
-	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
-	{},
-};
-
-static void __init processor_dmi_check(void)
-{
-	/*
-	 * Check whether the system is DMI table. If yes, OSPM
-	 * should not use mwait for CPU-states.
-	 */
-	dmi_check_system(processor_idle_dmi_table);
-}
-#else
-static inline void processor_dmi_check(void) {}
-#endif
-
-void __init acpi_early_processor_set_pdc(void)
-{
-	processor_dmi_check();
-
-	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    early_init_pdc, NULL, NULL, NULL);
-	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
-}
diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
new file mode 100644
index 0000000..e5dd808
--- /dev/null
+++ b/drivers/acpi/processor_pdc.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright (C) 2005 Intel Corporation
+ * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
+ *
+ *      Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ *      - Added _PDC for platforms with Intel CPUs
+ */
+
+#define pr_fmt(fmt) "ACPI: " fmt
+
+#include <linux/dmi.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <acpi/processor.h>
+
+#include "internal.h"
+
+#define _COMPONENT              ACPI_PROCESSOR_COMPONENT
+ACPI_MODULE_NAME("processor_pdc");
+
+static bool __init processor_physically_present(acpi_handle handle)
+{
+	int cpuid, type;
+	u32 acpi_id;
+	acpi_status status;
+	acpi_object_type acpi_type;
+	unsigned long long tmp;
+	union acpi_object object = { 0 };
+	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
+
+	status = acpi_get_type(handle, &acpi_type);
+	if (ACPI_FAILURE(status))
+		return false;
+
+	switch (acpi_type) {
+	case ACPI_TYPE_PROCESSOR:
+		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
+		if (ACPI_FAILURE(status))
+			return false;
+		acpi_id = object.processor.proc_id;
+		break;
+	case ACPI_TYPE_DEVICE:
+		status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
+		if (ACPI_FAILURE(status))
+			return false;
+		acpi_id = tmp;
+		break;
+	default:
+		return false;
+	}
+
+	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
+	cpuid = acpi_get_cpuid(handle, type, acpi_id);
+
+	if (cpuid == -1)
+		return false;
+
+	return true;
+}
+
+static void acpi_set_pdc_bits(u32 *buf)
+{
+	buf[0] = ACPI_PDC_REVISION_ID;
+	buf[1] = 1;
+
+	/* Enable coordination with firmware's _TSD info */
+	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
+
+	/* Twiddle arch-specific bits needed for _PDC */
+	arch_acpi_set_pdc_bits(buf);
+}
+
+static struct acpi_object_list *acpi_processor_alloc_pdc(void)
+{
+	struct acpi_object_list *obj_list;
+	union acpi_object *obj;
+	u32 *buf;
+
+	/* allocate and initialize pdc. It will be used later. */
+	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
+	if (!obj_list)
+		goto out;
+
+	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
+	if (!obj) {
+		kfree(obj_list);
+		goto out;
+	}
+
+	buf = kmalloc(12, GFP_KERNEL);
+	if (!buf) {
+		kfree(obj);
+		kfree(obj_list);
+		goto out;
+	}
+
+	acpi_set_pdc_bits(buf);
+
+	obj->type = ACPI_TYPE_BUFFER;
+	obj->buffer.length = 12;
+	obj->buffer.pointer = (u8 *) buf;
+	obj_list->count = 1;
+	obj_list->pointer = obj;
+
+	return obj_list;
+out:
+	pr_err("Memory allocation error\n");
+	return NULL;
+}
+
+/*
+ * _PDC is required for a BIOS-OS handshake for most of the newer
+ * ACPI processor features.
+ */
+static acpi_status
+acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
+{
+	acpi_status status = AE_OK;
+
+	if (boot_option_idle_override == IDLE_NOMWAIT) {
+		/*
+		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
+		 * mode will be disabled in the parameter of _PDC object.
+		 * Of course C1_FFH access mode will also be disabled.
+		 */
+		union acpi_object *obj;
+		u32 *buffer = NULL;
+
+		obj = pdc_in->pointer;
+		buffer = (u32 *)(obj->buffer.pointer);
+		buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
+
+	}
+	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
+
+	if (ACPI_FAILURE(status))
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+		    "Could not evaluate _PDC, using legacy perf. control.\n"));
+
+	return status;
+}
+
+void acpi_processor_set_pdc(acpi_handle handle)
+{
+	struct acpi_object_list *obj_list;
+
+	if (arch_has_acpi_pdc() == false)
+		return;
+
+	obj_list = acpi_processor_alloc_pdc();
+	if (!obj_list)
+		return;
+
+	acpi_processor_eval_pdc(handle, obj_list);
+
+	kfree(obj_list->pointer->buffer.pointer);
+	kfree(obj_list->pointer);
+	kfree(obj_list);
+}
+
+static acpi_status __init
+early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+	if (processor_physically_present(handle) == false)
+		return AE_OK;
+
+	acpi_processor_set_pdc(handle);
+	return AE_OK;
+}
+
+static int __init set_no_mwait(const struct dmi_system_id *id)
+{
+	pr_notice("%s detected - disabling mwait for CPU C-states\n",
+		  id->ident);
+	boot_option_idle_override = IDLE_NOMWAIT;
+	return 0;
+}
+
+static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
+	{
+	set_no_mwait, "Extensa 5220", {
+	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
+	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
+	{},
+};
+
+static void __init processor_dmi_check(void)
+{
+	/*
+	 * Check whether the system is DMI table. If yes, OSPM
+	 * should not use mwait for CPU-states.
+	 */
+	dmi_check_system(processor_idle_dmi_table);
+}
+
+void __init acpi_early_processor_set_pdc(void)
+{
+	processor_dmi_check();
+
+	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
+			    ACPI_UINT32_MAX,
+			    early_init_pdc, NULL, NULL, NULL);
+	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
+}
-- 
1.7.9.5

[PATCH v4 03/13] ACPI / processor: Introduce ARCH_HAS_ACPI_PDC

[Hanjun Guo]

The use of _PDC is deprecated in ACPI 3.0 in favor of _OSC,
as ARM platform is supported only in ACPI 5.0 or higher version,
_PDC will not be used in ARM platform, so make Make _PDC only for
platforms with Intel CPUs.

Introduce ARCH_HAS_ACPI_PDC and move _PDC related code in ACPI
processor driver into a single file processor_pdc.c, make x86
and ia64 select ARCH_HAS_ACPI_PDC when ACPI is enabled.

This patch also use pr_* to replace printk to fix the checkpatch
warning and factor acpi_processor_alloc_pdc() a little bit to
avoid duplicate pr_err() code.

Suggested-by: Robert Richter <rric@kernel.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/ia64/Kconfig             |    1 +
 arch/x86/Kconfig              |    1 +
 drivers/acpi/Kconfig          |   10 ++
 drivers/acpi/Makefile         |    1 +
 drivers/acpi/internal.h       |    5 +
 drivers/acpi/processor_core.c |  198 ---------------------------------------
 drivers/acpi/processor_pdc.c  |  206 +++++++++++++++++++++++++++++++++++++++++
 7 files changed, 224 insertions(+), 198 deletions(-)
 create mode 100644 drivers/acpi/processor_pdc.c

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index f82b352..cde2626 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -10,6 +10,7 @@ config IA64
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select PCI if (!IA64_HP_SIM)
 	select ACPI if (!IA64_HP_SIM)
+	select ARCH_HAS_ACPI_PDC if ACPI
 	select PM if (!IA64_HP_SIM)
 	select HAVE_UNSTABLE_SCHED_CLOCK
 	select HAVE_IDE
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4865d44..d60cec7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -21,6 +21,7 @@ config X86_64
 ### Arch settings
 config X86
 	def_bool y
+	select ARCH_HAS_ACPI_PDC if ACPI
 	select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 70eaf7a..0e6f72d 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -367,6 +367,16 @@ config ACPI_REDUCED_HARDWARE_ONLY
 
 	If you are unsure what to do, do not enable this option.
 
+config ARCH_HAS_ACPI_PDC
+	bool
+	help
+	  The _PDC object provides OSPM a mechanism to convey to the platform
+	  the capabilities supported by OSPM for processor power management.
+	  This allows the platform to modify the ACPI namespace objects returning
+	  configuration information for processor power management based on the
+	  level of support provided by OSPM.The use of _PDC is deprecated in
+	  ACPI 3.0 in favor of _OSC.
+
 source "drivers/acpi/apei/Kconfig"
 
 config ACPI_EXTLOG
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index ea55e01..b638e95 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -36,6 +36,7 @@ acpi-y				+= scan.o
 acpi-y				+= resource.o
 acpi-y				+= acpi_processor.o
 acpi-y				+= processor_core.o
+acpi-$(CONFIG_ARCH_HAS_ACPI_PDC) += processor_pdc.o
 acpi-y				+= ec.o
 acpi-$(CONFIG_ACPI_DOCK)	+= dock.o
 acpi-y				+= pci_root.o pci_link.o pci_irq.o
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 7de5b60..d7376ee 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -108,7 +108,12 @@ int acpi_power_transition(struct acpi_device *device, int state);
 int acpi_device_update_power(struct acpi_device *device, int *state_p);
 
 int acpi_wakeup_device_init(void);
+
+#ifdef CONFIG_ARCH_HAS_ACPI_PDC
 void acpi_early_processor_set_pdc(void);
+#else
+static inline void acpi_early_processor_set_pdc(void) {}
+#endif
 
 /* --------------------------------------------------------------------------
                                   Embedded Controller
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 71e2065..00f48d1 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -4,17 +4,11 @@
  *
  *	Alex Chiang <achiang@hp.com>
  *	- Unified x86/ia64 implementations
- *	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
- *	- Added _PDC for platforms with Intel CPUs
  */
 #include <linux/export.h>
-#include <linux/dmi.h>
-#include <linux/slab.h>
 #include <linux/acpi.h>
 #include <acpi/processor.h>
 
-#include "internal.h"
-
 #define _COMPONENT		ACPI_PROCESSOR_COMPONENT
 ACPI_MODULE_NAME("processor_core");
 
@@ -208,195 +202,3 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 	return acpi_map_cpuid(apic_id, acpi_id);
 }
 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
-
-static bool __init processor_physically_present(acpi_handle handle)
-{
-	int cpuid, type;
-	u32 acpi_id;
-	acpi_status status;
-	acpi_object_type acpi_type;
-	unsigned long long tmp;
-	union acpi_object object = { 0 };
-	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
-
-	status = acpi_get_type(handle, &acpi_type);
-	if (ACPI_FAILURE(status))
-		return false;
-
-	switch (acpi_type) {
-	case ACPI_TYPE_PROCESSOR:
-		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
-		if (ACPI_FAILURE(status))
-			return false;
-		acpi_id = object.processor.proc_id;
-		break;
-	case ACPI_TYPE_DEVICE:
-		status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
-		if (ACPI_FAILURE(status))
-			return false;
-		acpi_id = tmp;
-		break;
-	default:
-		return false;
-	}
-
-	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
-	cpuid = acpi_get_cpuid(handle, type, acpi_id);
-
-	if (cpuid == -1)
-		return false;
-
-	return true;
-}
-
-static void acpi_set_pdc_bits(u32 *buf)
-{
-	buf[0] = ACPI_PDC_REVISION_ID;
-	buf[1] = 1;
-
-	/* Enable coordination with firmware's _TSD info */
-	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
-
-	/* Twiddle arch-specific bits needed for _PDC */
-	arch_acpi_set_pdc_bits(buf);
-}
-
-static struct acpi_object_list *acpi_processor_alloc_pdc(void)
-{
-	struct acpi_object_list *obj_list;
-	union acpi_object *obj;
-	u32 *buf;
-
-	/* allocate and initialize pdc. It will be used later. */
-	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
-	if (!obj_list) {
-		printk(KERN_ERR "Memory allocation error\n");
-		return NULL;
-	}
-
-	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
-	if (!obj) {
-		printk(KERN_ERR "Memory allocation error\n");
-		kfree(obj_list);
-		return NULL;
-	}
-
-	buf = kmalloc(12, GFP_KERNEL);
-	if (!buf) {
-		printk(KERN_ERR "Memory allocation error\n");
-		kfree(obj);
-		kfree(obj_list);
-		return NULL;
-	}
-
-	acpi_set_pdc_bits(buf);
-
-	obj->type = ACPI_TYPE_BUFFER;
-	obj->buffer.length = 12;
-	obj->buffer.pointer = (u8 *) buf;
-	obj_list->count = 1;
-	obj_list->pointer = obj;
-
-	return obj_list;
-}
-
-/*
- * _PDC is required for a BIOS-OS handshake for most of the newer
- * ACPI processor features.
- */
-static acpi_status
-acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
-{
-	acpi_status status = AE_OK;
-
-	if (boot_option_idle_override == IDLE_NOMWAIT) {
-		/*
-		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
-		 * mode will be disabled in the parameter of _PDC object.
-		 * Of course C1_FFH access mode will also be disabled.
-		 */
-		union acpi_object *obj;
-		u32 *buffer = NULL;
-
-		obj = pdc_in->pointer;
-		buffer = (u32 *)(obj->buffer.pointer);
-		buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
-
-	}
-	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
-
-	if (ACPI_FAILURE(status))
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-		    "Could not evaluate _PDC, using legacy perf. control.\n"));
-
-	return status;
-}
-
-void acpi_processor_set_pdc(acpi_handle handle)
-{
-	struct acpi_object_list *obj_list;
-
-	if (arch_has_acpi_pdc() == false)
-		return;
-
-	obj_list = acpi_processor_alloc_pdc();
-	if (!obj_list)
-		return;
-
-	acpi_processor_eval_pdc(handle, obj_list);
-
-	kfree(obj_list->pointer->buffer.pointer);
-	kfree(obj_list->pointer);
-	kfree(obj_list);
-}
-
-static acpi_status __init
-early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
-{
-	if (processor_physically_present(handle) == false)
-		return AE_OK;
-
-	acpi_processor_set_pdc(handle);
-	return AE_OK;
-}
-
-#if defined(CONFIG_X86) || defined(CONFIG_IA64)
-static int __init set_no_mwait(const struct dmi_system_id *id)
-{
-	pr_notice(PREFIX "%s detected - disabling mwait for CPU C-states\n",
-		  id->ident);
-	boot_option_idle_override = IDLE_NOMWAIT;
-	return 0;
-}
-
-static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
-	{
-	set_no_mwait, "Extensa 5220", {
-	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
-	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
-	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
-	{},
-};
-
-static void __init processor_dmi_check(void)
-{
-	/*
-	 * Check whether the system is DMI table. If yes, OSPM
-	 * should not use mwait for CPU-states.
-	 */
-	dmi_check_system(processor_idle_dmi_table);
-}
-#else
-static inline void processor_dmi_check(void) {}
-#endif
-
-void __init acpi_early_processor_set_pdc(void)
-{
-	processor_dmi_check();
-
-	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    early_init_pdc, NULL, NULL, NULL);
-	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
-}
diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
new file mode 100644
index 0000000..e5dd808
--- /dev/null
+++ b/drivers/acpi/processor_pdc.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright (C) 2005 Intel Corporation
+ * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
+ *
+ *      Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ *      - Added _PDC for platforms with Intel CPUs
+ */
+
+#define pr_fmt(fmt) "ACPI: " fmt
+
+#include <linux/dmi.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <acpi/processor.h>
+
+#include "internal.h"
+
+#define _COMPONENT              ACPI_PROCESSOR_COMPONENT
+ACPI_MODULE_NAME("processor_pdc");
+
+static bool __init processor_physically_present(acpi_handle handle)
+{
+	int cpuid, type;
+	u32 acpi_id;
+	acpi_status status;
+	acpi_object_type acpi_type;
+	unsigned long long tmp;
+	union acpi_object object = { 0 };
+	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
+
+	status = acpi_get_type(handle, &acpi_type);
+	if (ACPI_FAILURE(status))
+		return false;
+
+	switch (acpi_type) {
+	case ACPI_TYPE_PROCESSOR:
+		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
+		if (ACPI_FAILURE(status))
+			return false;
+		acpi_id = object.processor.proc_id;
+		break;
+	case ACPI_TYPE_DEVICE:
+		status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
+		if (ACPI_FAILURE(status))
+			return false;
+		acpi_id = tmp;
+		break;
+	default:
+		return false;
+	}
+
+	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
+	cpuid = acpi_get_cpuid(handle, type, acpi_id);
+
+	if (cpuid == -1)
+		return false;
+
+	return true;
+}
+
+static void acpi_set_pdc_bits(u32 *buf)
+{
+	buf[0] = ACPI_PDC_REVISION_ID;
+	buf[1] = 1;
+
+	/* Enable coordination with firmware's _TSD info */
+	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
+
+	/* Twiddle arch-specific bits needed for _PDC */
+	arch_acpi_set_pdc_bits(buf);
+}
+
+static struct acpi_object_list *acpi_processor_alloc_pdc(void)
+{
+	struct acpi_object_list *obj_list;
+	union acpi_object *obj;
+	u32 *buf;
+
+	/* allocate and initialize pdc. It will be used later. */
+	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
+	if (!obj_list)
+		goto out;
+
+	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
+	if (!obj) {
+		kfree(obj_list);
+		goto out;
+	}
+
+	buf = kmalloc(12, GFP_KERNEL);
+	if (!buf) {
+		kfree(obj);
+		kfree(obj_list);
+		goto out;
+	}
+
+	acpi_set_pdc_bits(buf);
+
+	obj->type = ACPI_TYPE_BUFFER;
+	obj->buffer.length = 12;
+	obj->buffer.pointer = (u8 *) buf;
+	obj_list->count = 1;
+	obj_list->pointer = obj;
+
+	return obj_list;
+out:
+	pr_err("Memory allocation error\n");
+	return NULL;
+}
+
+/*
+ * _PDC is required for a BIOS-OS handshake for most of the newer
+ * ACPI processor features.
+ */
+static acpi_status
+acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
+{
+	acpi_status status = AE_OK;
+
+	if (boot_option_idle_override == IDLE_NOMWAIT) {
+		/*
+		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
+		 * mode will be disabled in the parameter of _PDC object.
+		 * Of course C1_FFH access mode will also be disabled.
+		 */
+		union acpi_object *obj;
+		u32 *buffer = NULL;
+
+		obj = pdc_in->pointer;
+		buffer = (u32 *)(obj->buffer.pointer);
+		buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
+
+	}
+	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
+
+	if (ACPI_FAILURE(status))
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+		    "Could not evaluate _PDC, using legacy perf. control.\n"));
+
+	return status;
+}
+
+void acpi_processor_set_pdc(acpi_handle handle)
+{
+	struct acpi_object_list *obj_list;
+
+	if (arch_has_acpi_pdc() == false)
+		return;
+
+	obj_list = acpi_processor_alloc_pdc();
+	if (!obj_list)
+		return;
+
+	acpi_processor_eval_pdc(handle, obj_list);
+
+	kfree(obj_list->pointer->buffer.pointer);
+	kfree(obj_list->pointer);
+	kfree(obj_list);
+}
+
+static acpi_status __init
+early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+	if (processor_physically_present(handle) == false)
+		return AE_OK;
+
+	acpi_processor_set_pdc(handle);
+	return AE_OK;
+}
+
+static int __init set_no_mwait(const struct dmi_system_id *id)
+{
+	pr_notice("%s detected - disabling mwait for CPU C-states\n",
+		  id->ident);
+	boot_option_idle_override = IDLE_NOMWAIT;
+	return 0;
+}
+
+static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
+	{
+	set_no_mwait, "Extensa 5220", {
+	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
+	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
+	{},
+};
+
+static void __init processor_dmi_check(void)
+{
+	/*
+	 * Check whether the system is DMI table. If yes, OSPM
+	 * should not use mwait for CPU-states.
+	 */
+	dmi_check_system(processor_idle_dmi_table);
+}
+
+void __init acpi_early_processor_set_pdc(void)
+{
+	processor_dmi_check();
+
+	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
+			    ACPI_UINT32_MAX,
+			    early_init_pdc, NULL, NULL, NULL);
+	acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
+}
-- 
1.7.9.5

[PATCH v4 04/13] ARM64 : Add dummy asm/cpu.h

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

ACPI core requires a cpu.h, add a dummy one here temporarily.
This file will be updated in the future to add definitions for
arch_(un)register_cpu which are required for ACPI based physical
CPU hotplug when these standards have be ratified by the ASWG.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/cpu.h |   11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 arch/arm64/include/asm/cpu.h

diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
new file mode 100644
index 0000000..cee7d3f
--- /dev/null
+++ b/arch/arm64/include/asm/cpu.h
@@ -0,0 +1,11 @@
+/*
+ *  Copyright (C) 2013-2014 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_CPU_H
+#define __ASM_CPU_H
+
+#endif
-- 
1.7.9.5

[PATCH v4 04/13] ARM64 : Add dummy asm/cpu.h

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

ACPI core requires a cpu.h, add a dummy one here temporarily.
This file will be updated in the future to add definitions for
arch_(un)register_cpu which are required for ACPI based physical
CPU hotplug when these standards have be ratified by the ASWG.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/cpu.h |   11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 arch/arm64/include/asm/cpu.h

diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
new file mode 100644
index 0000000..cee7d3f
--- /dev/null
+++ b/arch/arm64/include/asm/cpu.h
@@ -0,0 +1,11 @@
+/*
+ *  Copyright (C) 2013-2014 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __ASM_CPU_H
+#define __ASM_CPU_H
+
+#endif
-- 
1.7.9.5

[PATCH v4 05/13] ARM64 / ACPI: Introduce arm-core.c and its related head file

[Hanjun Guo]

From: Al Stone <al.stone@linaro.org>

ACPI core need lots extern variables and functions which should
be provided by arch dependent code to make itself compilable. so
introduce arm-core.c and its related header file here, we need:
  - asm/acenv.h for arch specific ACPICA environments and
    implementation;
  - asm/acpi.h for arch specific variables and functions needed by
    ACPI driver core;
  - arm-core.c for ARM64 related ACPI implementation for ACPI driver
    core;

acpi_boot_table_init() will be called in setup_arch() before
paging_init(), so we should use eary_memremap() mechanism here
to get the RSDP and all the table pointers. with this patch,
we can get ACPI boot-time tables from firmware on ARM64.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/acenv.h |   18 +++++++
 arch/arm64/include/asm/acpi.h  |   49 ++++++++++++++++++
 arch/arm64/kernel/setup.c      |    4 ++
 drivers/acpi/Makefile          |    2 +
 drivers/acpi/plat/Makefile     |    1 +
 drivers/acpi/plat/arm-core.c   |  110 ++++++++++++++++++++++++++++++++++++++++
 6 files changed, 184 insertions(+)
 create mode 100644 arch/arm64/include/asm/acenv.h
 create mode 100644 arch/arm64/include/asm/acpi.h
 create mode 100644 drivers/acpi/plat/Makefile
 create mode 100644 drivers/acpi/plat/arm-core.c

diff --git a/arch/arm64/include/asm/acenv.h b/arch/arm64/include/asm/acenv.h
new file mode 100644
index 0000000..3899ee6
--- /dev/null
+++ b/arch/arm64/include/asm/acenv.h
@@ -0,0 +1,18 @@
+/*
+ * ARM64 specific ACPICA environments and implementation
+ *
+ * Copyright (C) 2014, Linaro Ltd.
+ *   Author: Hanjun Guo <hanjun.guo@linaro.org>
+ *   Author: Graeme Gregory <graeme.gregory@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _ASM_ACENV_H
+#define _ASM_ACENV_H
+
+#define ACPI_FLUSH_CPU_CACHE() WARN_ONCE(1, "Not currently supported on ARM64")
+
+#endif /* _ASM_ACENV_H */
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
new file mode 100644
index 0000000..3ea6b84
--- /dev/null
+++ b/arch/arm64/include/asm/acpi.h
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (C) 2013-2014, Linaro Ltd.
+ *	Author: Al Stone <al.stone@linaro.org>
+ *	Author: Graeme Gregory <graeme.gregory@linaro.org>
+ *	Author: Hanjun Guo <hanjun.guo@linaro.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#ifndef _ASM_ACPI_H
+#define _ASM_ACPI_H
+
+/* Basic configuration for ACPI */
+#ifdef	CONFIG_ACPI
+extern int acpi_disabled;
+extern int acpi_noirq;
+extern int acpi_pci_disabled;
+extern int acpi_strict;
+
+static inline void disable_acpi(void)
+{
+	acpi_disabled = 1;
+	acpi_pci_disabled = 1;
+	acpi_noirq = 1;
+}
+
+/*
+ * The ACPI processor driver for ACPI core code needs this macro.
+ * Temporarily define it to -1 so that the ACPI core can compile,
+ * but update it when we get the hardware ID from the MADT table.
+ */
+#define cpu_physical_id(cpu) -1
+
+static inline bool acpi_arch_is_smp(void)
+{
+	return 1;
+}
+
+#endif /* CONFIG_ACPI */
+
+#endif /*_ASM_ACPI_H*/
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 46d1125..9dedb0b 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -43,6 +43,7 @@
 #include <linux/of_fdt.h>
 #include <linux/of_platform.h>
 #include <linux/efi.h>
+#include <linux/acpi.h>
 
 #include <asm/fixmap.h>
 #include <asm/cputype.h>
@@ -385,6 +386,9 @@ void __init setup_arch(char **cmdline_p)
 	efi_init();
 	arm64_memblock_init();
 
+	/* Parse the ACPI tables for possible boot-time configuration */
+	acpi_boot_table_init();
+
 	paging_init();
 	request_standard_resources();
 
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index b638e95..c50ea88 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -86,3 +86,5 @@ obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
 obj-$(CONFIG_ACPI_APEI)		+= apei/
 
 obj-$(CONFIG_ACPI_EXTLOG)	+= acpi_extlog.o
+
+obj-y				+= plat/
diff --git a/drivers/acpi/plat/Makefile b/drivers/acpi/plat/Makefile
new file mode 100644
index 0000000..46bc65e
--- /dev/null
+++ b/drivers/acpi/plat/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ARM64)	+= arm-core.o
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
new file mode 100644
index 0000000..c6c7e03
--- /dev/null
+++ b/drivers/acpi/plat/arm-core.c
@@ -0,0 +1,110 @@
+/*
+ *  ARM/ARM64 Specific Low-Level ACPI Boot Support
+ *
+ *  Copyright (C) 2013-2014, Linaro Ltd.
+ *	Author: Al Stone <al.stone@linaro.org>
+ *	Author: Graeme Gregory <graeme.gregory@linaro.org>
+ *	Author: Hanjun Guo <hanjun.guo@linaro.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/cpumask.h>
+#include <linux/memblock.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/bootmem.h>
+#include <linux/smp.h>
+
+#include <asm/pgtable.h>
+
+/*
+ * We never plan to use RSDT on arm/arm64 as its deprecated in spec but this
+ * variable is still required by the ACPI core
+ */
+u32 acpi_rsdt_forced;
+
+int acpi_noirq;			/* skip ACPI IRQ initialization */
+int acpi_strict;
+int acpi_disabled;
+EXPORT_SYMBOL(acpi_disabled);
+
+int acpi_pci_disabled;		/* skip ACPI PCI scan and IRQ initialization */
+EXPORT_SYMBOL(acpi_pci_disabled);
+
+enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
+
+/*
+ * __acpi_map_table() will be called before page_init(), so early_ioremap()
+ * or early_memremap() should be called here.
+ */
+char *__init __acpi_map_table(unsigned long phys, unsigned long size)
+{
+	if (!phys || !size)
+		return NULL;
+
+	return early_memremap(phys, size);
+}
+
+void __init __acpi_unmap_table(char *map, unsigned long size)
+{
+	if (!map || !size)
+		return;
+
+	early_iounmap(map, size);
+}
+
+int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
+{
+	*irq = -1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
+
+/*
+ * success: return IRQ number (>0)
+ * failure: return =< 0
+ */
+int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
+{
+	return -1;
+}
+EXPORT_SYMBOL_GPL(acpi_register_gsi);
+
+void acpi_unregister_gsi(u32 gsi)
+{
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
+
+/*
+ * acpi_boot_table_init() called from setup_arch(), always.
+ *	1. find RSDP and get its address, and then find XSDT
+ *	2. extract all tables and checksums them all
+ *
+ * We can parse ACPI boot-time tables such as FADT, MADT after
+ * this function is called.
+ */
+void __init acpi_boot_table_init(void)
+{
+	/* If acpi_disabled, bail out */
+	if (acpi_disabled)
+		return;
+
+	/* Initialize the ACPI boot-time table parser. */
+	if (acpi_table_init()) {
+		disable_acpi();
+		return;
+	}
+}
-- 
1.7.9.5

[PATCH v4 05/13] ARM64 / ACPI: Introduce arm-core.c and its related head file

[Hanjun Guo]

From: Al Stone <al.stone@linaro.org>

ACPI core need lots extern variables and functions which should
be provided by arch dependent code to make itself compilable. so
introduce arm-core.c and its related header file here, we need:
  - asm/acenv.h for arch specific ACPICA environments and
    implementation;
  - asm/acpi.h for arch specific variables and functions needed by
    ACPI driver core;
  - arm-core.c for ARM64 related ACPI implementation for ACPI driver
    core;

acpi_boot_table_init() will be called in setup_arch() before
paging_init(), so we should use eary_memremap() mechanism here
to get the RSDP and all the table pointers. with this patch,
we can get ACPI boot-time tables from firmware on ARM64.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/acenv.h |   18 +++++++
 arch/arm64/include/asm/acpi.h  |   49 ++++++++++++++++++
 arch/arm64/kernel/setup.c      |    4 ++
 drivers/acpi/Makefile          |    2 +
 drivers/acpi/plat/Makefile     |    1 +
 drivers/acpi/plat/arm-core.c   |  110 ++++++++++++++++++++++++++++++++++++++++
 6 files changed, 184 insertions(+)
 create mode 100644 arch/arm64/include/asm/acenv.h
 create mode 100644 arch/arm64/include/asm/acpi.h
 create mode 100644 drivers/acpi/plat/Makefile
 create mode 100644 drivers/acpi/plat/arm-core.c

diff --git a/arch/arm64/include/asm/acenv.h b/arch/arm64/include/asm/acenv.h
new file mode 100644
index 0000000..3899ee6
--- /dev/null
+++ b/arch/arm64/include/asm/acenv.h
@@ -0,0 +1,18 @@
+/*
+ * ARM64 specific ACPICA environments and implementation
+ *
+ * Copyright (C) 2014, Linaro Ltd.
+ *   Author: Hanjun Guo <hanjun.guo@linaro.org>
+ *   Author: Graeme Gregory <graeme.gregory@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _ASM_ACENV_H
+#define _ASM_ACENV_H
+
+#define ACPI_FLUSH_CPU_CACHE() WARN_ONCE(1, "Not currently supported on ARM64")
+
+#endif /* _ASM_ACENV_H */
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
new file mode 100644
index 0000000..3ea6b84
--- /dev/null
+++ b/arch/arm64/include/asm/acpi.h
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (C) 2013-2014, Linaro Ltd.
+ *	Author: Al Stone <al.stone@linaro.org>
+ *	Author: Graeme Gregory <graeme.gregory@linaro.org>
+ *	Author: Hanjun Guo <hanjun.guo@linaro.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#ifndef _ASM_ACPI_H
+#define _ASM_ACPI_H
+
+/* Basic configuration for ACPI */
+#ifdef	CONFIG_ACPI
+extern int acpi_disabled;
+extern int acpi_noirq;
+extern int acpi_pci_disabled;
+extern int acpi_strict;
+
+static inline void disable_acpi(void)
+{
+	acpi_disabled = 1;
+	acpi_pci_disabled = 1;
+	acpi_noirq = 1;
+}
+
+/*
+ * The ACPI processor driver for ACPI core code needs this macro.
+ * Temporarily define it to -1 so that the ACPI core can compile,
+ * but update it when we get the hardware ID from the MADT table.
+ */
+#define cpu_physical_id(cpu) -1
+
+static inline bool acpi_arch_is_smp(void)
+{
+	return 1;
+}
+
+#endif /* CONFIG_ACPI */
+
+#endif /*_ASM_ACPI_H*/
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 46d1125..9dedb0b 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -43,6 +43,7 @@
 #include <linux/of_fdt.h>
 #include <linux/of_platform.h>
 #include <linux/efi.h>
+#include <linux/acpi.h>
 
 #include <asm/fixmap.h>
 #include <asm/cputype.h>
@@ -385,6 +386,9 @@ void __init setup_arch(char **cmdline_p)
 	efi_init();
 	arm64_memblock_init();
 
+	/* Parse the ACPI tables for possible boot-time configuration */
+	acpi_boot_table_init();
+
 	paging_init();
 	request_standard_resources();
 
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index b638e95..c50ea88 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -86,3 +86,5 @@ obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
 obj-$(CONFIG_ACPI_APEI)		+= apei/
 
 obj-$(CONFIG_ACPI_EXTLOG)	+= acpi_extlog.o
+
+obj-y				+= plat/
diff --git a/drivers/acpi/plat/Makefile b/drivers/acpi/plat/Makefile
new file mode 100644
index 0000000..46bc65e
--- /dev/null
+++ b/drivers/acpi/plat/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ARM64)	+= arm-core.o
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
new file mode 100644
index 0000000..c6c7e03
--- /dev/null
+++ b/drivers/acpi/plat/arm-core.c
@@ -0,0 +1,110 @@
+/*
+ *  ARM/ARM64 Specific Low-Level ACPI Boot Support
+ *
+ *  Copyright (C) 2013-2014, Linaro Ltd.
+ *	Author: Al Stone <al.stone@linaro.org>
+ *	Author: Graeme Gregory <graeme.gregory@linaro.org>
+ *	Author: Hanjun Guo <hanjun.guo@linaro.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/cpumask.h>
+#include <linux/memblock.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/bootmem.h>
+#include <linux/smp.h>
+
+#include <asm/pgtable.h>
+
+/*
+ * We never plan to use RSDT on arm/arm64 as its deprecated in spec but this
+ * variable is still required by the ACPI core
+ */
+u32 acpi_rsdt_forced;
+
+int acpi_noirq;			/* skip ACPI IRQ initialization */
+int acpi_strict;
+int acpi_disabled;
+EXPORT_SYMBOL(acpi_disabled);
+
+int acpi_pci_disabled;		/* skip ACPI PCI scan and IRQ initialization */
+EXPORT_SYMBOL(acpi_pci_disabled);
+
+enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
+
+/*
+ * __acpi_map_table() will be called before page_init(), so early_ioremap()
+ * or early_memremap() should be called here.
+ */
+char *__init __acpi_map_table(unsigned long phys, unsigned long size)
+{
+	if (!phys || !size)
+		return NULL;
+
+	return early_memremap(phys, size);
+}
+
+void __init __acpi_unmap_table(char *map, unsigned long size)
+{
+	if (!map || !size)
+		return;
+
+	early_iounmap(map, size);
+}
+
+int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
+{
+	*irq = -1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
+
+/*
+ * success: return IRQ number (>0)
+ * failure: return =< 0
+ */
+int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
+{
+	return -1;
+}
+EXPORT_SYMBOL_GPL(acpi_register_gsi);
+
+void acpi_unregister_gsi(u32 gsi)
+{
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
+
+/*
+ * acpi_boot_table_init() called from setup_arch(), always.
+ *	1. find RSDP and get its address, and then find XSDT
+ *	2. extract all tables and checksums them all
+ *
+ * We can parse ACPI boot-time tables such as FADT, MADT after
+ * this function is called.
+ */
+void __init acpi_boot_table_init(void)
+{
+	/* If acpi_disabled, bail out */
+	if (acpi_disabled)
+		return;
+
+	/* Initialize the ACPI boot-time table parser. */
+	if (acpi_table_init()) {
+		disable_acpi();
+		return;
+	}
+}
-- 
1.7.9.5

[PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi"

[Hanjun Guo]

From: Al Stone <al.stone@linaro.org>

Introduce two early parameters for "acpi", one is the parameter
to disable ACPI on ARM64 and another one is acpi=strict to disable
out-of-spec workarounds.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 Documentation/kernel-parameters.txt |    3 ++-
 drivers/acpi/plat/arm-core.c        |   21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8849049..b7e9fc0 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -165,7 +165,7 @@ multipliers 'Kilo', 'Mega', and 'Giga', equalling 2^10, 2^20, and 2^30
 bytes respectively. Such letter suffixes can also be entirely omitted.
 
 
-	acpi=		[HW,ACPI,X86]
+	acpi=		[HW,ACPI,X86,ARM]
 			Advanced Configuration and Power Interface
 			Format: { force | off | strict | noirq | rsdt }
 			force -- enable ACPI if default was off
@@ -175,6 +175,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 				strictly ACPI specification compliant.
 			rsdt -- prefer RSDT over (default) XSDT
 			copy_dsdt -- copy DSDT to memory
+			For ARM64, ONLY "off" and "strict" are available.
 
 			See also Documentation/power/runtime_pm.txt, pci=noacpi
 
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
index c6c7e03..cf46c25 100644
--- a/drivers/acpi/plat/arm-core.c
+++ b/drivers/acpi/plat/arm-core.c
@@ -108,3 +108,24 @@ void __init acpi_boot_table_init(void)
 		return;
 	}
 }
+
+static int __init parse_acpi(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+	/* "acpi=off" disables both ACPI table parsing and interpreter */
+	if (strcmp(arg, "off") == 0) {
+		disable_acpi();
+	}
+	/* acpi=strict disables out-of-spec workarounds */
+	else if (strcmp(arg, "strict") == 0) {
+		acpi_strict = 1;
+	} else {
+		/* Core will printk when we return error */
+		return -EINVAL;
+	}
+
+	return 0;
+}
+early_param("acpi", parse_acpi);
-- 
1.7.9.5

[PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi"

[Hanjun Guo]

From: Al Stone <al.stone@linaro.org>

Introduce two early parameters for "acpi", one is the parameter
to disable ACPI on ARM64 and another one is acpi=strict to disable
out-of-spec workarounds.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 Documentation/kernel-parameters.txt |    3 ++-
 drivers/acpi/plat/arm-core.c        |   21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8849049..b7e9fc0 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -165,7 +165,7 @@ multipliers 'Kilo', 'Mega', and 'Giga', equalling 2^10, 2^20, and 2^30
 bytes respectively. Such letter suffixes can also be entirely omitted.
 
 
-	acpi=		[HW,ACPI,X86]
+	acpi=		[HW,ACPI,X86,ARM]
 			Advanced Configuration and Power Interface
 			Format: { force | off | strict | noirq | rsdt }
 			force -- enable ACPI if default was off
@@ -175,6 +175,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 				strictly ACPI specification compliant.
 			rsdt -- prefer RSDT over (default) XSDT
 			copy_dsdt -- copy DSDT to memory
+			For ARM64, ONLY "off" and "strict" are available.
 
 			See also Documentation/power/runtime_pm.txt, pci=noacpi
 
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
index c6c7e03..cf46c25 100644
--- a/drivers/acpi/plat/arm-core.c
+++ b/drivers/acpi/plat/arm-core.c
@@ -108,3 +108,24 @@ void __init acpi_boot_table_init(void)
 		return;
 	}
 }
+
+static int __init parse_acpi(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+	/* "acpi=off" disables both ACPI table parsing and interpreter */
+	if (strcmp(arg, "off") == 0) {
+		disable_acpi();
+	}
+	/* acpi=strict disables out-of-spec workarounds */
+	else if (strcmp(arg, "strict") == 0) {
+		acpi_strict = 1;
+	} else {
+		/* Core will printk when we return error */
+		return -EINVAL;
+	}
+
+	return 0;
+}
+early_param("acpi", parse_acpi);
-- 
1.7.9.5

[PATCH v4 07/13] ARM64 / ACPI: Introduce lowlevel suspend function

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

acpi_wakeup_address is used on x86 as the address bios jumps into
when machine wakes up from suspend. As arm64 does not have such a
bios this mechanism will be provided by other means. But the define
is still required inside the acpi core.

Introduce a null stub for acpi_suspend_lowlevel as this is also
required by core. This will be filled in when standards are
defined for arm64 ACPI global power states.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/acpi.h |   12 ++++++++++++
 drivers/acpi/plat/arm-core.c  |    7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index 3ea6b84..a93e8ae 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -39,6 +39,18 @@ static inline void disable_acpi(void)
  */
 #define cpu_physical_id(cpu) -1
 
+/*
+ * Low-level suspend routine.
+ *
+ * ACPI S-states for ARM64 have to be defined
+ * and approved before doing anything else, maybe
+ * we need update the ACPI spec, here just we
+ * just introduce function and macro needed by
+ * ACPI core, and revisit them when the spec is ready.
+ */
+extern int (*acpi_suspend_lowlevel)(void);
+#define acpi_wakeup_address (0)
+
 static inline bool acpi_arch_is_smp(void)
 {
 	return 1;
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
index cf46c25..0155a98 100644
--- a/drivers/acpi/plat/arm-core.c
+++ b/drivers/acpi/plat/arm-core.c
@@ -129,3 +129,10 @@ static int __init parse_acpi(char *arg)
 	return 0;
 }
 early_param("acpi", parse_acpi);
+
+/*
+ * acpi_suspend_lowlevel() - save kernel state and suspend.
+ *
+ * TBD when ARM/ARM64 starts to support suspend...
+ */
+int (*acpi_suspend_lowlevel)(void);
-- 
1.7.9.5

[PATCH v4 07/13] ARM64 / ACPI: Introduce lowlevel suspend function

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

acpi_wakeup_address is used on x86 as the address bios jumps into
when machine wakes up from suspend. As arm64 does not have such a
bios this mechanism will be provided by other means. But the define
is still required inside the acpi core.

Introduce a null stub for acpi_suspend_lowlevel as this is also
required by core. This will be filled in when standards are
defined for arm64 ACPI global power states.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/acpi.h |   12 ++++++++++++
 drivers/acpi/plat/arm-core.c  |    7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index 3ea6b84..a93e8ae 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -39,6 +39,18 @@ static inline void disable_acpi(void)
  */
 #define cpu_physical_id(cpu) -1
 
+/*
+ * Low-level suspend routine.
+ *
+ * ACPI S-states for ARM64 have to be defined
+ * and approved before doing anything else, maybe
+ * we need update the ACPI spec, here just we
+ * just introduce function and macro needed by
+ * ACPI core, and revisit them when the spec is ready.
+ */
+extern int (*acpi_suspend_lowlevel)(void);
+#define acpi_wakeup_address (0)
+
 static inline bool acpi_arch_is_smp(void)
 {
 	return 1;
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
index cf46c25..0155a98 100644
--- a/drivers/acpi/plat/arm-core.c
+++ b/drivers/acpi/plat/arm-core.c
@@ -129,3 +129,10 @@ static int __init parse_acpi(char *arg)
 	return 0;
 }
 early_param("acpi", parse_acpi);
+
+/*
+ * acpi_suspend_lowlevel() - save kernel state and suspend.
+ *
+ * TBD when ARM/ARM64 starts to support suspend...
+ */
+int (*acpi_suspend_lowlevel)(void);
-- 
1.7.9.5

[PATCH v4 08/13] ARM64 / ACPI: Introduce arch_fix_phys_package_id() for cpu topology

[Hanjun Guo]

arch_fix_phys_package_id() will be called in ACPI core to use
the slot number provided by ACPI to update the physical package
id, then we can get the right value in the "physical id" field
of /proc/cpuinfo.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/topology.h |    2 ++
 arch/arm64/kernel/topology.c      |   14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h
index 7ebcd31..2b216d4 100644
--- a/arch/arm64/include/asm/topology.h
+++ b/arch/arm64/include/asm/topology.h
@@ -23,11 +23,13 @@ extern struct cpu_topology cpu_topology[NR_CPUS];
 void init_cpu_topology(void);
 void store_cpu_topology(unsigned int cpuid);
 const struct cpumask *cpu_coregroup_mask(int cpu);
+void arch_fix_phys_package_id(int num, u32 slot);
 
 #else
 
 static inline void init_cpu_topology(void) { }
 static inline void store_cpu_topology(unsigned int cpuid) { }
+static inline void arch_fix_phys_package_id(int num, u32 slot) { }
 
 #endif
 
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 43514f9..c547885 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -281,3 +281,17 @@ void __init init_cpu_topology(void)
 	if (parse_dt_topology())
 		reset_cpu_topology();
 }
+
+/*
+ * Use the CPU slot number provided by ACPI to update the physical
+ * package id when cpuid_topo->cluster_id is not available, then we
+ * can get the right value in the "physical id" field of /proc/cpuinfo.
+ */
+void arch_fix_phys_package_id(int num, u32 slot)
+{
+	struct cpu_topology *cpuid_topo = &cpu_topology[num];
+
+	if (cpuid_topo->cluster_id == -1)
+		cpuid_topo->cluster_id = slot;
+}
+EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
-- 
1.7.9.5

[PATCH v4 08/13] ARM64 / ACPI: Introduce arch_fix_phys_package_id() for cpu topology

[Hanjun Guo]

arch_fix_phys_package_id() will be called in ACPI core to use
the slot number provided by ACPI to update the physical package
id, then we can get the right value in the "physical id" field
of /proc/cpuinfo.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/topology.h |    2 ++
 arch/arm64/kernel/topology.c      |   14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h
index 7ebcd31..2b216d4 100644
--- a/arch/arm64/include/asm/topology.h
+++ b/arch/arm64/include/asm/topology.h
@@ -23,11 +23,13 @@ extern struct cpu_topology cpu_topology[NR_CPUS];
 void init_cpu_topology(void);
 void store_cpu_topology(unsigned int cpuid);
 const struct cpumask *cpu_coregroup_mask(int cpu);
+void arch_fix_phys_package_id(int num, u32 slot);
 
 #else
 
 static inline void init_cpu_topology(void) { }
 static inline void store_cpu_topology(unsigned int cpuid) { }
+static inline void arch_fix_phys_package_id(int num, u32 slot) { }
 
 #endif
 
diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 43514f9..c547885 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -281,3 +281,17 @@ void __init init_cpu_topology(void)
 	if (parse_dt_topology())
 		reset_cpu_topology();
 }
+
+/*
+ * Use the CPU slot number provided by ACPI to update the physical
+ * package id when cpuid_topo->cluster_id is not available, then we
+ * can get the right value in the "physical id" field of /proc/cpuinfo.
+ */
+void arch_fix_phys_package_id(int num, u32 slot)
+{
+	struct cpu_topology *cpuid_topo = &cpu_topology[num];
+
+	if (cpuid_topo->cluster_id == -1)
+		cpuid_topo->cluster_id = slot;
+}
+EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
-- 
1.7.9.5

[PATCH v4 09/13] ARM64 / ACPI: Introduce PCI functions for ACPI on ARM64

[Hanjun Guo]

CONFIG_ACPI depends CONFIG_PCI now, and ACPI provides ACPI based
PCI hotplug and PCI host bridge hotplug, introduce some PCI
functions to make ACPI core can be compiled, some of the functions
should be revisited when implemented on ARM64.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Originally-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/pci.h |    6 ++++++
 arch/arm64/kernel/pci.c      |   28 ++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
index d93576f..46501d4 100644
--- a/arch/arm64/include/asm/pci.h
+++ b/arch/arm64/include/asm/pci.h
@@ -21,6 +21,12 @@ struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus);
 #define pcibios_assign_all_busses() \
 	(pci_has_flag(PCI_REASSIGN_ALL_BUS))
 
+static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
+{
+	/* no legacy IRQ on arm64 */
+	return -ENODEV;
+}
+
 /*
  * PCI address space differs from physical memory address space
  */
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 9f29c9a..1f7aedd 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -17,6 +17,7 @@
 #include <linux/of_pci.h>
 #include <linux/of_platform.h>
 #include <linux/slab.h>
+#include <linux/acpi.h>
 
 #include <asm/pci-bridge.h>
 
@@ -171,3 +172,30 @@ unsigned long pci_ioremap_io(const struct resource *res, phys_addr_t phys_addr)
 	/* return io_offset */
 	return start * PAGE_SIZE - res->start;
 }
+
+/*
+ * raw_pci_read - Platform-specific PCI config space access.
+ *
+ * Default empty implementation.  Replace with an architecture-specific setup
+ * routine, if necessary.
+ */
+int raw_pci_read(unsigned int domain, unsigned int bus,
+		  unsigned int devfn, int reg, int len, u32 *val)
+{
+	return -EINVAL;
+}
+
+int raw_pci_write(unsigned int domain, unsigned int bus,
+		  unsigned int devfn, int reg, int len, u32 val)
+{
+	return -EINVAL;
+}
+
+#ifdef CONFIG_ACPI
+/* Root bridge scanning */
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+	/* TODO: Should be revisited when implementing PCI on ACPI */
+	return NULL;
+}
+#endif
-- 
1.7.9.5

[PATCH v4 09/13] ARM64 / ACPI: Introduce PCI functions for ACPI on ARM64

[Hanjun Guo]

CONFIG_ACPI depends CONFIG_PCI now, and ACPI provides ACPI based
PCI hotplug and PCI host bridge hotplug, introduce some PCI
functions to make ACPI core can be compiled, some of the functions
should be revisited when implemented on ARM64.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Originally-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/include/asm/pci.h |    6 ++++++
 arch/arm64/kernel/pci.c      |   28 ++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
index d93576f..46501d4 100644
--- a/arch/arm64/include/asm/pci.h
+++ b/arch/arm64/include/asm/pci.h
@@ -21,6 +21,12 @@ struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus);
 #define pcibios_assign_all_busses() \
 	(pci_has_flag(PCI_REASSIGN_ALL_BUS))
 
+static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
+{
+	/* no legacy IRQ on arm64 */
+	return -ENODEV;
+}
+
 /*
  * PCI address space differs from physical memory address space
  */
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 9f29c9a..1f7aedd 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -17,6 +17,7 @@
 #include <linux/of_pci.h>
 #include <linux/of_platform.h>
 #include <linux/slab.h>
+#include <linux/acpi.h>
 
 #include <asm/pci-bridge.h>
 
@@ -171,3 +172,30 @@ unsigned long pci_ioremap_io(const struct resource *res, phys_addr_t phys_addr)
 	/* return io_offset */
 	return start * PAGE_SIZE - res->start;
 }
+
+/*
+ * raw_pci_read - Platform-specific PCI config space access.
+ *
+ * Default empty implementation.  Replace with an architecture-specific setup
+ * routine, if necessary.
+ */
+int raw_pci_read(unsigned int domain, unsigned int bus,
+		  unsigned int devfn, int reg, int len, u32 *val)
+{
+	return -EINVAL;
+}
+
+int raw_pci_write(unsigned int domain, unsigned int bus,
+		  unsigned int devfn, int reg, int len, u32 val)
+{
+	return -EINVAL;
+}
+
+#ifdef CONFIG_ACPI
+/* Root bridge scanning */
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+	/* TODO: Should be revisited when implementing PCI on ACPI */
+	return NULL;
+}
+#endif
-- 
1.7.9.5

[PATCH v4 10/13] ACPI: Make EC debugfs depend on X86 || IA64 in Kconfig

[Hanjun Guo]

Since EC (Embedded controller) needs SCI for the interupt which
is not available on ARM64, make the EC debugfs depend on X86 || IA64
only in the Kconfig file.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 drivers/acpi/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 0e6f72d..7de5e3f 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -69,6 +69,7 @@ config ACPI_PROCFS_POWER
 
 config ACPI_EC_DEBUGFS
 	tristate "EC read/write access through /sys/kernel/debug/ec"
+	depends on X86 || IA64
 	default n
 	help
 	  Say N to disable Embedded Controller /sys/kernel/debug interface
-- 
1.7.9.5

[PATCH v4 10/13] ACPI: Make EC debugfs depend on X86 || IA64 in Kconfig

[Hanjun Guo]

Since EC (Embedded controller) needs SCI for the interupt which
is not available on ARM64, make the EC debugfs depend on X86 || IA64
only in the Kconfig file.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 drivers/acpi/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 0e6f72d..7de5e3f 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -69,6 +69,7 @@ config ACPI_PROCFS_POWER
 
 config ACPI_EC_DEBUGFS
 	tristate "EC read/write access through /sys/kernel/debug/ec"
+	depends on X86 || IA64
 	default n
 	help
 	  Say N to disable Embedded Controller /sys/kernel/debug interface
-- 
1.7.9.5

[PATCH v4 11/13] ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64

[Hanjun Guo]

From: Al Stone <al.stone@linaro.org>

ACPI reduced hardware mode is disabled by default, but ARM64
can only run properly in ACPI hardware reduced mode, so select
ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index db5190a..102384e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1,5 +1,6 @@
 config ARM64
 	def_bool y
+	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
 	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
-- 
1.7.9.5

[PATCH v4 11/13] ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64

[Hanjun Guo]

From: Al Stone <al.stone@linaro.org>

ACPI reduced hardware mode is disabled by default, but ARM64
can only run properly in ACPI hardware reduced mode, so select
ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index db5190a..102384e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1,5 +1,6 @@
 config ARM64
 	def_bool y
+	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
 	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
-- 
1.7.9.5

[PATCH v4 12/13] ARM64 / ACPI: if we chose to boot from acpi then disable FDT

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

If the early boot methods of acpi are happy that we have valid ACPI
tables and acpi=off has not been passed. Then do not unflat devicetree
effectively disabling further hardware probing from DT.

Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
---
 arch/arm64/kernel/setup.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 9dedb0b..487fd1f 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -394,7 +394,8 @@ void __init setup_arch(char **cmdline_p)
 
 	efi_idmap_init();
 
-	unflatten_device_tree();
+	if (acpi_disabled)
+		unflatten_device_tree();
 
 	psci_init();
 
-- 
1.7.9.5

[PATCH v4 12/13] ARM64 / ACPI: if we chose to boot from acpi then disable FDT

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

If the early boot methods of acpi are happy that we have valid ACPI
tables and acpi=off has not been passed. Then do not unflat devicetree
effectively disabling further hardware probing from DT.

Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
---
 arch/arm64/kernel/setup.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 9dedb0b..487fd1f 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -394,7 +394,8 @@ void __init setup_arch(char **cmdline_p)
 
 	efi_idmap_init();
 
-	unflatten_device_tree();
+	if (acpi_disabled)
+		unflatten_device_tree();
 
 	psci_init();
 
-- 
1.7.9.5

[PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

Add Kconfigs to build ACPI on ARM64, and make ACPI available on ARM64.

acpi_idle driver is x86/IA64 dependent now, so make CONFIG_ACPI_PROCESSOR
depend on X86 || IA64, and implement it on ARM64 in the future.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/Kconfig   |    2 ++
 drivers/acpi/Kconfig |    5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 102384e..314634f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -377,6 +377,8 @@ source "drivers/Kconfig"
 
 source "drivers/firmware/Kconfig"
 
+source "drivers/acpi/Kconfig"
+
 source "fs/Kconfig"
 
 source "arch/arm64/kvm/Kconfig"
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 7de5e3f..33d6dbb 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
 menuconfig ACPI
 	bool "ACPI (Advanced Configuration and Power Interface) Support"
 	depends on !IA64_HP_SIM
-	depends on IA64 || X86
+	depends on IA64 || X86 || ARM64
 	depends on PCI
 	select PNP
-	default y
+	default y if !ARM64
 	help
 	  Advanced Configuration and Power Interface (ACPI) support for 
 	  Linux requires an ACPI-compliant platform (hardware/firmware),
@@ -161,6 +161,7 @@ config ACPI_PROCESSOR
 	tristate "Processor"
 	select THERMAL
 	select CPU_IDLE
+	depends on X86 || IA64
 	default y
 	help
 	  This driver installs ACPI as the idle handler for Linux and uses
-- 
1.7.9.5

[PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Hanjun Guo]

From: Graeme Gregory <graeme.gregory@linaro.org>

Add Kconfigs to build ACPI on ARM64, and make ACPI available on ARM64.

acpi_idle driver is x86/IA64 dependent now, so make CONFIG_ACPI_PROCESSOR
depend on X86 || IA64, and implement it on ARM64 in the future.

Reviewed-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Signed-off-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/Kconfig   |    2 ++
 drivers/acpi/Kconfig |    5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 102384e..314634f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -377,6 +377,8 @@ source "drivers/Kconfig"
 
 source "drivers/firmware/Kconfig"
 
+source "drivers/acpi/Kconfig"
+
 source "fs/Kconfig"
 
 source "arch/arm64/kvm/Kconfig"
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 7de5e3f..33d6dbb 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
 menuconfig ACPI
 	bool "ACPI (Advanced Configuration and Power Interface) Support"
 	depends on !IA64_HP_SIM
-	depends on IA64 || X86
+	depends on IA64 || X86 || ARM64
 	depends on PCI
 	select PNP
-	default y
+	default y if !ARM64
 	help
 	  Advanced Configuration and Power Interface (ACPI) support for 
 	  Linux requires an ACPI-compliant platform (hardware/firmware),
@@ -161,6 +161,7 @@ config ACPI_PROCESSOR
 	tristate "Processor"
 	select THERMAL
 	select CPU_IDLE
+	depends on X86 || IA64
 	default y
 	help
 	  This driver installs ACPI as the idle handler for Linux and uses
-- 
1.7.9.5

Re: [PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi"

[Arnd Bergmann]

On Friday 27 June 2014 11:49:29 Hanjun Guo wrote:
> +
> +static int __init parse_acpi(char *arg)
> +{
> +       if (!arg)
> +               return -EINVAL;
> +
> +       /* "acpi=off" disables both ACPI table parsing and interpreter */
> +       if (strcmp(arg, "off") == 0) {
> +               disable_acpi();
> +       }
> +       /* acpi=strict disables out-of-spec workarounds */
> +       else if (strcmp(arg, "strict") == 0) {
> +               acpi_strict = 1;
> +       } else {
> +               /* Core will printk when we return error */
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +early_param("acpi", parse_acpi);

Can you explain in the changelog what happens for the acpi=off case? Does this
mean we fall back to using data from the dtb instead, or will it just not work?

If I understand correctly, this option makes sense on PC systems that will
still be able to boot using the legacy BIOS services and implicit assumptions
about the hardware, but that never works on arm64.

	Arnd

[PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi"

[Arnd Bergmann]

On Friday 27 June 2014 11:49:29 Hanjun Guo wrote:
> +
> +static int __init parse_acpi(char *arg)
> +{
> +       if (!arg)
> +               return -EINVAL;
> +
> +       /* "acpi=off" disables both ACPI table parsing and interpreter */
> +       if (strcmp(arg, "off") == 0) {
> +               disable_acpi();
> +       }
> +       /* acpi=strict disables out-of-spec workarounds */
> +       else if (strcmp(arg, "strict") == 0) {
> +               acpi_strict = 1;
> +       } else {
> +               /* Core will printk when we return error */
> +               return -EINVAL;
> +       }
> +
> +       return 0;
> +}
> +early_param("acpi", parse_acpi);

Can you explain in the changelog what happens for the acpi=off case? Does this
mean we fall back to using data from the dtb instead, or will it just not work?

If I understand correctly, this option makes sense on PC systems that will
still be able to boot using the legacy BIOS services and implicit assumptions
about the hardware, but that never works on arm64.

	Arnd

Re: [Linaro-acpi] [PATCH v4 12/13] ARM64 / ACPI: if we chose to boot from acpi then disable FDT

[Arnd Bergmann]

On Friday 27 June 2014 11:49:35 Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
> 
> If the early boot methods of acpi are happy that we have valid ACPI
> tables and acpi=off has not been passed. Then do not unflat devicetree
> effectively disabling further hardware probing from DT.
> 

I guess this answers the question I had on patch 4 ;-)

	Arnd

[Linaro-acpi] [PATCH v4 12/13] ARM64 / ACPI: if we chose to boot from acpi then disable FDT

[Arnd Bergmann]

On Friday 27 June 2014 11:49:35 Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
> 
> If the early boot methods of acpi are happy that we have valid ACPI
> tables and acpi=off has not been passed. Then do not unflat devicetree
> effectively disabling further hardware probing from DT.
> 

I guess this answers the question I had on patch 4 ;-)

	Arnd

Re: [PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi"

[Graeme Gregory]

On Fri, Jun 27, 2014 at 11:07:48AM +0200, Arnd Bergmann wrote:
> On Friday 27 June 2014 11:49:29 Hanjun Guo wrote:
> > +
> > +static int __init parse_acpi(char *arg)
> > +{
> > +       if (!arg)
> > +               return -EINVAL;
> > +
> > +       /* "acpi=off" disables both ACPI table parsing and interpreter */
> > +       if (strcmp(arg, "off") == 0) {
> > +               disable_acpi();
> > +       }
> > +       /* acpi=strict disables out-of-spec workarounds */
> > +       else if (strcmp(arg, "strict") == 0) {
> > +               acpi_strict = 1;
> > +       } else {
> > +               /* Core will printk when we return error */
> > +               return -EINVAL;
> > +       }
> > +
> > +       return 0;
> > +}
> > +early_param("acpi", parse_acpi);
> 
> Can you explain in the changelog what happens for the acpi=off case? Does this
> mean we fall back to using data from the dtb instead, or will it just not work?
> 
> If I understand correctly, this option makes sense on PC systems that will
> still be able to boot using the legacy BIOS services and implicit assumptions
> about the hardware, but that never works on arm64.
> 
Yes the way ACPI has been integrated on ARM64 in these patches if you
supply acpi=off it will fall back to DTB if supplied by firmware.

Graeme

Re: [PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi"

[Graeme Gregory]

On Fri, Jun 27, 2014 at 11:07:48AM +0200, Arnd Bergmann wrote:
> On Friday 27 June 2014 11:49:29 Hanjun Guo wrote:
> > +
> > +static int __init parse_acpi(char *arg)
> > +{
> > +       if (!arg)
> > +               return -EINVAL;
> > +
> > +       /* "acpi=off" disables both ACPI table parsing and interpreter */
> > +       if (strcmp(arg, "off") == 0) {
> > +               disable_acpi();
> > +       }
> > +       /* acpi=strict disables out-of-spec workarounds */
> > +       else if (strcmp(arg, "strict") == 0) {
> > +               acpi_strict = 1;
> > +       } else {
> > +               /* Core will printk when we return error */
> > +               return -EINVAL;
> > +       }
> > +
> > +       return 0;
> > +}
> > +early_param("acpi", parse_acpi);
> 
> Can you explain in the changelog what happens for the acpi=off case? Does this
> mean we fall back to using data from the dtb instead, or will it just not work?
> 
> If I understand correctly, this option makes sense on PC systems that will
> still be able to boot using the legacy BIOS services and implicit assumptions
> about the hardware, but that never works on arm64.
> 
Yes the way ACPI has been integrated on ARM64 in these patches if you
supply acpi=off it will fall back to DTB if supplied by firmware.

Graeme

[PATCH v4 06/13] ARM64 / ACPI: Introduce early_param for "acpi"

[Graeme Gregory]

On Fri, Jun 27, 2014 at 11:07:48AM +0200, Arnd Bergmann wrote:
> On Friday 27 June 2014 11:49:29 Hanjun Guo wrote:
> > +
> > +static int __init parse_acpi(char *arg)
> > +{
> > +       if (!arg)
> > +               return -EINVAL;
> > +
> > +       /* "acpi=off" disables both ACPI table parsing and interpreter */
> > +       if (strcmp(arg, "off") == 0) {
> > +               disable_acpi();
> > +       }
> > +       /* acpi=strict disables out-of-spec workarounds */
> > +       else if (strcmp(arg, "strict") == 0) {
> > +               acpi_strict = 1;
> > +       } else {
> > +               /* Core will printk when we return error */
> > +               return -EINVAL;
> > +       }
> > +
> > +       return 0;
> > +}
> > +early_param("acpi", parse_acpi);
> 
> Can you explain in the changelog what happens for the acpi=off case? Does this
> mean we fall back to using data from the dtb instead, or will it just not work?
> 
> If I understand correctly, this option makes sense on PC systems that will
> still be able to boot using the legacy BIOS services and implicit assumptions
> about the hardware, but that never works on arm64.
> 
Yes the way ACPI has been integrated on ARM64 in these patches if you
supply acpi=off it will fall back to DTB if supplied by firmware.

Graeme

Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:36AM +0100, Hanjun Guo wrote:
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 7de5e3f..33d6dbb 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
>  menuconfig ACPI
>  	bool "ACPI (Advanced Configuration and Power Interface) Support"
>  	depends on !IA64_HP_SIM
> -	depends on IA64 || X86
> +	depends on IA64 || X86 || ARM64

I still don't understand what the point of enabling ACPI for arm64
during this series is. Do you get any working arm64 functionality
(on hardware or model) without subsequent patches? If it's just for
compilation reasons, the best we could do is depending on (ARM64 &&
COMPILE_TEST) but even though I would not merge this patch until we have
most of the arm64 required features in place (some of which are
introduced by the upcoming ACPI version).

>  	depends on PCI
>  	select PNP
> -	default y
> +	default y if !ARM64

For the benefit of single Image, I think you can default to y here.

-- 
Catalin

Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:36AM +0100, Hanjun Guo wrote:
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 7de5e3f..33d6dbb 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
>  menuconfig ACPI
>  	bool "ACPI (Advanced Configuration and Power Interface) Support"
>  	depends on !IA64_HP_SIM
> -	depends on IA64 || X86
> +	depends on IA64 || X86 || ARM64

I still don't understand what the point of enabling ACPI for arm64
during this series is. Do you get any working arm64 functionality
(on hardware or model) without subsequent patches? If it's just for
compilation reasons, the best we could do is depending on (ARM64 &&
COMPILE_TEST) but even though I would not merge this patch until we have
most of the arm64 required features in place (some of which are
introduced by the upcoming ACPI version).

>  	depends on PCI
>  	select PNP
> -	default y
> +	default y if !ARM64

For the benefit of single Image, I think you can default to y here.

-- 
Catalin

[PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:36AM +0100, Hanjun Guo wrote:
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 7de5e3f..33d6dbb 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
>  menuconfig ACPI
>  	bool "ACPI (Advanced Configuration and Power Interface) Support"
>  	depends on !IA64_HP_SIM
> -	depends on IA64 || X86
> +	depends on IA64 || X86 || ARM64

I still don't understand what the point of enabling ACPI for arm64
during this series is. Do you get any working arm64 functionality
(on hardware or model) without subsequent patches? If it's just for
compilation reasons, the best we could do is depending on (ARM64 &&
COMPILE_TEST) but even though I would not merge this patch until we have
most of the arm64 required features in place (some of which are
introduced by the upcoming ACPI version).

>  	depends on PCI
>  	select PNP
> -	default y
> +	default y if !ARM64

For the benefit of single Image, I think you can default to y here.

-- 
Catalin

Re: [PATCH v4 05/13] ARM64 / ACPI: Introduce arm-core.c and its related head file

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:28AM +0100, Hanjun Guo wrote:
>  drivers/acpi/Makefile          |    2 +
>  drivers/acpi/plat/Makefile     |    1 +
>  drivers/acpi/plat/arm-core.c   |  110 ++++++++++++++++++++++++++++++++++++++++

Do you ever plan to add ACPI support for 32-bit ARM? If not, this part
could be placed under arch/arm64 (similar to x86).

-- 
Catalin

Re: [PATCH v4 05/13] ARM64 / ACPI: Introduce arm-core.c and its related head file

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:28AM +0100, Hanjun Guo wrote:
>  drivers/acpi/Makefile          |    2 +
>  drivers/acpi/plat/Makefile     |    1 +
>  drivers/acpi/plat/arm-core.c   |  110 ++++++++++++++++++++++++++++++++++++++++

Do you ever plan to add ACPI support for 32-bit ARM? If not, this part
could be placed under arch/arm64 (similar to x86).

-- 
Catalin

[PATCH v4 05/13] ARM64 / ACPI: Introduce arm-core.c and its related head file

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:28AM +0100, Hanjun Guo wrote:
>  drivers/acpi/Makefile          |    2 +
>  drivers/acpi/plat/Makefile     |    1 +
>  drivers/acpi/plat/arm-core.c   |  110 ++++++++++++++++++++++++++++++++++++++++

Do you ever plan to add ACPI support for 32-bit ARM? If not, this part
could be placed under arch/arm64 (similar to x86).

-- 
Catalin

Re: [PATCH v4 07/13] ARM64 / ACPI: Introduce lowlevel suspend function

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:30AM +0100, Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
> 
> acpi_wakeup_address is used on x86 as the address bios jumps into
> when machine wakes up from suspend. As arm64 does not have such a
> bios this mechanism will be provided by other means. But the define
> is still required inside the acpi core.

Why not fix the place where it is used rather than defining a dummy
pointer?

> Introduce a null stub for acpi_suspend_lowlevel as this is also
> required by core. This will be filled in when standards are
> defined for arm64 ACPI global power states.

I assume acpi_suspend_lowlevel would be just a dummy definition but it
will have some use when the standard allows.

-- 
Catalin

Re: [PATCH v4 07/13] ARM64 / ACPI: Introduce lowlevel suspend function

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:30AM +0100, Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
> 
> acpi_wakeup_address is used on x86 as the address bios jumps into
> when machine wakes up from suspend. As arm64 does not have such a
> bios this mechanism will be provided by other means. But the define
> is still required inside the acpi core.

Why not fix the place where it is used rather than defining a dummy
pointer?

> Introduce a null stub for acpi_suspend_lowlevel as this is also
> required by core. This will be filled in when standards are
> defined for arm64 ACPI global power states.

I assume acpi_suspend_lowlevel would be just a dummy definition but it
will have some use when the standard allows.

-- 
Catalin

[PATCH v4 07/13] ARM64 / ACPI: Introduce lowlevel suspend function

[Catalin Marinas]

On Fri, Jun 27, 2014 at 04:49:30AM +0100, Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@linaro.org>
> 
> acpi_wakeup_address is used on x86 as the address bios jumps into
> when machine wakes up from suspend. As arm64 does not have such a
> bios this mechanism will be provided by other means. But the define
> is still required inside the acpi core.

Why not fix the place where it is used rather than defining a dummy
pointer?

> Introduce a null stub for acpi_suspend_lowlevel as this is also
> required by core. This will be filled in when standards are
> defined for arm64 ACPI global power states.

I assume acpi_suspend_lowlevel would be just a dummy definition but it
will have some use when the standard allows.

-- 
Catalin

Re: [PATCH v4 05/13] ARM64 / ACPI: Introduce arm-core.c and its related head file

[Graeme Gregory]

On 30/06/2014 17:24, Catalin Marinas wrote:
> On Fri, Jun 27, 2014 at 04:49:28AM +0100, Hanjun Guo wrote:
>>   drivers/acpi/Makefile          |    2 +
>>   drivers/acpi/plat/Makefile     |    1 +
>>   drivers/acpi/plat/arm-core.c   |  110 ++++++++++++++++++++++++++++++++++++++++
> Do you ever plan to add ACPI support for 32-bit ARM? If not, this part
> could be placed under arch/arm64 (similar to x86).
>
Originally the plan was to support both platforms, but it seems people 
have stopped talking to Linaro about 32bit support now so unless anyone 
else has some actual info I guess it would be safe to move it into arm64.

Graeme

Re: [PATCH v4 05/13] ARM64 / ACPI: Introduce arm-core.c and its related head file

[Graeme Gregory]

On 30/06/2014 17:24, Catalin Marinas wrote:
> On Fri, Jun 27, 2014 at 04:49:28AM +0100, Hanjun Guo wrote:
>>   drivers/acpi/Makefile          |    2 +
>>   drivers/acpi/plat/Makefile     |    1 +
>>   drivers/acpi/plat/arm-core.c   |  110 ++++++++++++++++++++++++++++++++++++++++
> Do you ever plan to add ACPI support for 32-bit ARM? If not, this part
> could be placed under arch/arm64 (similar to x86).
>
Originally the plan was to support both platforms, but it seems people 
have stopped talking to Linaro about 32bit support now so unless anyone 
else has some actual info I guess it would be safe to move it into arm64.

Graeme

[PATCH v4 05/13] ARM64 / ACPI: Introduce arm-core.c and its related head file

[Graeme Gregory]

On 30/06/2014 17:24, Catalin Marinas wrote:
> On Fri, Jun 27, 2014 at 04:49:28AM +0100, Hanjun Guo wrote:
>>   drivers/acpi/Makefile          |    2 +
>>   drivers/acpi/plat/Makefile     |    1 +
>>   drivers/acpi/plat/arm-core.c   |  110 ++++++++++++++++++++++++++++++++++++++++
> Do you ever plan to add ACPI support for 32-bit ARM? If not, this part
> could be placed under arch/arm64 (similar to x86).
>
Originally the plan was to support both platforms, but it seems people 
have stopped talking to Linaro about 32bit support now so unless anyone 
else has some actual info I guess it would be safe to move it into arm64.

Graeme

Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Hanjun Guo]

On 2014-6-30 18:46, Catalin Marinas wrote:
> On Fri, Jun 27, 2014 at 04:49:36AM +0100, Hanjun Guo wrote:
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index 7de5e3f..33d6dbb 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
>>  menuconfig ACPI
>>  	bool "ACPI (Advanced Configuration and Power Interface) Support"
>>  	depends on !IA64_HP_SIM
>> -	depends on IA64 || X86
>> +	depends on IA64 || X86 || ARM64
> 
> I still don't understand what the point of enabling ACPI for arm64
> during this series is. Do you get any working arm64 functionality
> (on hardware or model) without subsequent patches? If it's just for
> compilation reasons, the best we could do is depending on (ARM64 &&
> COMPILE_TEST) but even though I would not merge this patch until we have
> most of the arm64 required features in place (some of which are
> introduced by the upcoming ACPI version).

it is ok to me to merge all the patches together, but if Rafael is happy
with the clean up patches (patch 1~3) for ACPI core, they can be merged
first.

> 
>>  	depends on PCI
>>  	select PNP
>> -	default y
>> +	default y if !ARM64
> 
> For the benefit of single Image, I think you can default to y here.

It ok to me. if we default to y here, devicetree will not be unflattened
in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
we chose to boot from acpi then disable FDT".

Thanks
Hanjun

Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Hanjun Guo]

On 2014-6-30 18:46, Catalin Marinas wrote:
> On Fri, Jun 27, 2014 at 04:49:36AM +0100, Hanjun Guo wrote:
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index 7de5e3f..33d6dbb 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
>>  menuconfig ACPI
>>  	bool "ACPI (Advanced Configuration and Power Interface) Support"
>>  	depends on !IA64_HP_SIM
>> -	depends on IA64 || X86
>> +	depends on IA64 || X86 || ARM64
> 
> I still don't understand what the point of enabling ACPI for arm64
> during this series is. Do you get any working arm64 functionality
> (on hardware or model) without subsequent patches? If it's just for
> compilation reasons, the best we could do is depending on (ARM64 &&
> COMPILE_TEST) but even though I would not merge this patch until we have
> most of the arm64 required features in place (some of which are
> introduced by the upcoming ACPI version).

it is ok to me to merge all the patches together, but if Rafael is happy
with the clean up patches (patch 1~3) for ACPI core, they can be merged
first.

> 
>>  	depends on PCI
>>  	select PNP
>> -	default y
>> +	default y if !ARM64
> 
> For the benefit of single Image, I think you can default to y here.

It ok to me. if we default to y here, devicetree will not be unflattened
in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
we chose to boot from acpi then disable FDT".

Thanks
Hanjun

[PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Hanjun Guo]

On 2014-6-30 18:46, Catalin Marinas wrote:
> On Fri, Jun 27, 2014 at 04:49:36AM +0100, Hanjun Guo wrote:
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index 7de5e3f..33d6dbb 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -8,10 +8,10 @@ config ACPI_SCAN_BIOS_NOT_EFI
>>  menuconfig ACPI
>>  	bool "ACPI (Advanced Configuration and Power Interface) Support"
>>  	depends on !IA64_HP_SIM
>> -	depends on IA64 || X86
>> +	depends on IA64 || X86 || ARM64
> 
> I still don't understand what the point of enabling ACPI for arm64
> during this series is. Do you get any working arm64 functionality
> (on hardware or model) without subsequent patches? If it's just for
> compilation reasons, the best we could do is depending on (ARM64 &&
> COMPILE_TEST) but even though I would not merge this patch until we have
> most of the arm64 required features in place (some of which are
> introduced by the upcoming ACPI version).

it is ok to me to merge all the patches together, but if Rafael is happy
with the clean up patches (patch 1~3) for ACPI core, they can be merged
first.

> 
>>  	depends on PCI
>>  	select PNP
>> -	default y
>> +	default y if !ARM64
> 
> For the benefit of single Image, I think you can default to y here.

It ok to me. if we default to y here, devicetree will not be unflattened
in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
we chose to boot from acpi then disable FDT".

Thanks
Hanjun

Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Hanjun Guo]

>>
>>>  	depends on PCI
>>>  	select PNP
>>> -	default y
>>> +	default y if !ARM64
>>
>> For the benefit of single Image, I think you can default to y here.
> 
> It ok to me. if we default to y here, devicetree will not be unflattened
> in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
> we chose to boot from acpi then disable FDT".

Ah, sorry I didn't describe it clearly. since there is no shipping board
with ACPI tables, so ACPI will disabled in the very early stage and FDT
still have chance to be unflattened, so will not break DT booting in
this patchset.

Thanks
Hanjun

Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Hanjun Guo]

>>
>>>  	depends on PCI
>>>  	select PNP
>>> -	default y
>>> +	default y if !ARM64
>>
>> For the benefit of single Image, I think you can default to y here.
> 
> It ok to me. if we default to y here, devicetree will not be unflattened
> in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
> we chose to boot from acpi then disable FDT".

Ah, sorry I didn't describe it clearly. since there is no shipping board
with ACPI tables, so ACPI will disabled in the very early stage and FDT
still have chance to be unflattened, so will not break DT booting in
this patchset.

Thanks
Hanjun

[PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Hanjun Guo]

>>
>>>  	depends on PCI
>>>  	select PNP
>>> -	default y
>>> +	default y if !ARM64
>>
>> For the benefit of single Image, I think you can default to y here.
> 
> It ok to me. if we default to y here, devicetree will not be unflattened
> in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
> we chose to boot from acpi then disable FDT".

Ah, sorry I didn't describe it clearly. since there is no shipping board
with ACPI tables, so ACPI will disabled in the very early stage and FDT
still have chance to be unflattened, so will not break DT booting in
this patchset.

Thanks
Hanjun

Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Catalin Marinas]

On Tue, Jul 01, 2014 at 09:20:20AM +0100, Hanjun Guo wrote:
> >>>  	depends on PCI
> >>>  	select PNP
> >>> -	default y
> >>> +	default y if !ARM64
> >>
> >> For the benefit of single Image, I think you can default to y here.
> > 
> > It ok to me. if we default to y here, devicetree will not be unflattened
> > in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
> > we chose to boot from acpi then disable FDT".
> 
> Ah, sorry I didn't describe it clearly. since there is no shipping board
> with ACPI tables, so ACPI will disabled in the very early stage and FDT
> still have chance to be unflattened, so will not break DT booting in
> this patchset.

That's what I thought. So leaving it as a default y is fine by me. But I
would not merge this patch now until we get some useful functionality
for arm64.

The x86-related cleanup patches can be merged separately via the
corresponding trees (it's up to the ACPI and x86 maintainers).

-- 
Catalin

Re: [PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Catalin Marinas]

On Tue, Jul 01, 2014 at 09:20:20AM +0100, Hanjun Guo wrote:
> >>>  	depends on PCI
> >>>  	select PNP
> >>> -	default y
> >>> +	default y if !ARM64
> >>
> >> For the benefit of single Image, I think you can default to y here.
> > 
> > It ok to me. if we default to y here, devicetree will not be unflattened
> > in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
> > we chose to boot from acpi then disable FDT".
> 
> Ah, sorry I didn't describe it clearly. since there is no shipping board
> with ACPI tables, so ACPI will disabled in the very early stage and FDT
> still have chance to be unflattened, so will not break DT booting in
> this patchset.

That's what I thought. So leaving it as a default y is fine by me. But I
would not merge this patch now until we get some useful functionality
for arm64.

The x86-related cleanup patches can be merged separately via the
corresponding trees (it's up to the ACPI and x86 maintainers).

-- 
Catalin

[PATCH v4 13/13] ARM64 / ACPI: Enable ARM64 in Kconfig

[Catalin Marinas]

On Tue, Jul 01, 2014 at 09:20:20AM +0100, Hanjun Guo wrote:
> >>>  	depends on PCI
> >>>  	select PNP
> >>> -	default y
> >>> +	default y if !ARM64
> >>
> >> For the benefit of single Image, I think you can default to y here.
> > 
> > It ok to me. if we default to y here, devicetree will not be unflattened
> > in default, is it ok to you? you can refer to "[PATCH 12/13] ARM64 / ACPI: if
> > we chose to boot from acpi then disable FDT".
> 
> Ah, sorry I didn't describe it clearly. since there is no shipping board
> with ACPI tables, so ACPI will disabled in the very early stage and FDT
> still have chance to be unflattened, so will not break DT booting in
> this patchset.

That's what I thought. So leaving it as a default y is fine by me. But I
would not merge this patch now until we get some useful functionality
for arm64.

The x86-related cleanup patches can be merged separately via the
corresponding trees (it's up to the ACPI and x86 maintainers).

-- 
Catalin