[PATCH v3 00/11] arch/x86: AMD QoS support

[PATCH v3 00/11] arch/x86: AMD QoS support

[Moger, Babu]

This series adds support for AMD64 architectural extensions for Platform
Quality of Service. These extensions are intended to provide for the
monitoring of the usage of certain system resources by one or more
processors and for the separate allocation and enforcement of limits on
the use of certain system resources by one or more processors.

The monitoring and enforcement are not necessarily applied across the
entire system, but in general apply to a QOS domain which corresponds to
some shared system resource.  The set of resources which are monitored and
the set for which the enforcement of limits is provided are implementation
dependent. Platform QOS features are implemented on a logical processor basis.
Therefore, multiple hardware threads of a single physical CPU core may have
independent resource monitoring and enforcement configurations.

AMD's next generation of processors support following QoS sub-features.
- L3 Cache allocation enforcement
- L3 Cache occupancy monitoring
- L3 Code-Data Prioritization support
- Memory Bandwidth Enforcement(Allocation)

The public specification for this feature is available at
https://developer.amd.com/wp-content/resources/56375.pdf

Obviously, there are multiple ways we can go about these changes. We felt
it is appropriate to rename and re-organize the code little bit before
making the functional changes. The first few patches(1-6) renames and
re-organizes the sources in preparation. Rest of the patches(7-11) adds
support for AMD QoS features.

Please review and provide me feedback.

Changes from v2 -> v3:
 a. Rebased the patches on top of below branch as suggested by Thomas Gleixner.
    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/cache
 b. Addressed comments from Reinette Chatre, Fenghua Yu and Borislav Petkov.
 c. Main changes are related to renaming the files and functions.
    Renamed from intel_rdt to more generic resctrl(patches 1 to 3).
 d. Config parameter changed from PLATFORM_QOS to more generic RESCTRL.
 e. Fixed minor indentation issues.

Changes from v1 -> v2:
 https://lore.kernel.org/lkml/20181005205512.29545-1-babu.moger@amd.com/
 a. Removed RFC from subject header. Based on the discussion so far, 
    plan is to go ahead with these patches and eventually re-structure
    the code to make arch and non-arch separate.
 b. Addressed comments from Reinette Chatre and Fenghua Yu.
 c. Separated quirks and MBA from rdt init code. Kept the rest of the
    code as is.
 d. Added _intel suffixes all the Intel only code just like AMD code.
 e. Added one more patch to bring the macros into header file.
 f. Few minor text changes.

v1:
 https://lore.kernel.org/lkml/20180924191841.29111-1-babu.moger@amd.com/


Babu Moger (10):
  arch/x86: Start renaming the rdt files to more generic names
  arch/x86: Rename the RDT functions and definitions
  arch/x86: Re-arrange RDT init code
  arch/x86: Bring all the macros to resctrl.h
  arch/x86: Introduce a new config parameter RESCTRL
  arch/x86: Use new config parameter RESCTRL for compilation
  arch/x86: Initialize the resource functions that are different
  arch/x86: Bring few more functions into the resource structure
  arch/x86: Introduce new config parameter AMD_QOS
  arch/x86: Introduce QOS feature for AMD

Sherry Hurwitz (1):
  arch/x86: Add AMD feature bit X86_FEATURE_MBA in cpuid bits array

 arch/x86/Kconfig                              |  19 ++
 .../{intel_rdt_sched.h => resctrl_sched.h}    |  28 +--
 arch/x86/kernel/cpu/Makefile                  |   6 +-
 .../x86/kernel/cpu/{intel_rdt.c => resctrl.c} | 169 +++++++++++++++---
 .../x86/kernel/cpu/{intel_rdt.h => resctrl.h} |  41 +++--
 ...dt_ctrlmondata.c => resctrl_ctrlmondata.c} |  80 ++++++++-
 ...{intel_rdt_monitor.c => resctrl_monitor.c} |  30 ++--
 ...dt_pseudo_lock.c => resctrl_pseudo_lock.c} |   6 +-
 ...ck_event.h => resctrl_pseudo_lock_event.h} |   2 +-
 ...ntel_rdt_rdtgroup.c => resctrl_rdtgroup.c} |  14 +-
 arch/x86/kernel/cpu/scattered.c               |   7 +-
 arch/x86/kernel/process_32.c                  |   4 +-
 arch/x86/kernel/process_64.c                  |   4 +-
 include/linux/sched.h                         |   2 +-
 14 files changed, 320 insertions(+), 92 deletions(-)
 rename arch/x86/include/asm/{intel_rdt_sched.h => resctrl_sched.h} (77%)
 rename arch/x86/kernel/cpu/{intel_rdt.c => resctrl.c} (84%)
 rename arch/x86/kernel/cpu/{intel_rdt.h => resctrl.h} (92%)
 rename arch/x86/kernel/cpu/{intel_rdt_ctrlmondata.c => resctrl_ctrlmondata.c} (86%)
 rename arch/x86/kernel/cpu/{intel_rdt_monitor.c => resctrl_monitor.c} (96%)
 rename arch/x86/kernel/cpu/{intel_rdt_pseudo_lock.c => resctrl_pseudo_lock.c} (99%)
 rename arch/x86/kernel/cpu/{intel_rdt_pseudo_lock_event.h => resctrl_pseudo_lock_event.h} (95%)
 rename arch/x86/kernel/cpu/{intel_rdt_rdtgroup.c => resctrl_rdtgroup.c} (99%)

-- 
2.17.1

[PATCH v3 01/11] arch/x86: Start renaming the rdt files to more generic names

[Moger, Babu]

New generation of AMD processors start supporting RDT(or QOS) features.
With more than one vendors supporting these features, it seems more
appropriate to rename these files.

Changed intel_rdt to resctrl where applicable.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/include/asm/{intel_rdt_sched.h => resctrl_sched.h} | 0
 arch/x86/kernel/cpu/Makefile                                | 6 +++---
 arch/x86/kernel/cpu/{intel_rdt.c => resctrl.c}              | 4 ++--
 arch/x86/kernel/cpu/{intel_rdt.h => resctrl.h}              | 6 +++---
 .../cpu/{intel_rdt_ctrlmondata.c => resctrl_ctrlmondata.c}  | 2 +-
 .../kernel/cpu/{intel_rdt_monitor.c => resctrl_monitor.c}   | 2 +-
 .../cpu/{intel_rdt_pseudo_lock.c => resctrl_pseudo_lock.c}  | 6 +++---
 ..._rdt_pseudo_lock_event.h => resctrl_pseudo_lock_event.h} | 2 +-
 .../kernel/cpu/{intel_rdt_rdtgroup.c => resctrl_rdtgroup.c} | 4 ++--
 arch/x86/kernel/process_32.c                                | 2 +-
 arch/x86/kernel/process_64.c                                | 2 +-
 11 files changed, 18 insertions(+), 18 deletions(-)
 rename arch/x86/include/asm/{intel_rdt_sched.h => resctrl_sched.h} (100%)
 rename arch/x86/kernel/cpu/{intel_rdt.c => resctrl.c} (99%)
 rename arch/x86/kernel/cpu/{intel_rdt.h => resctrl.h} (99%)
 rename arch/x86/kernel/cpu/{intel_rdt_ctrlmondata.c => resctrl_ctrlmondata.c} (99%)
 rename arch/x86/kernel/cpu/{intel_rdt_monitor.c => resctrl_monitor.c} (99%)
 rename arch/x86/kernel/cpu/{intel_rdt_pseudo_lock.c => resctrl_pseudo_lock.c} (99%)
 rename arch/x86/kernel/cpu/{intel_rdt_pseudo_lock_event.h => resctrl_pseudo_lock_event.h} (95%)
 rename arch/x86/kernel/cpu/{intel_rdt_rdtgroup.c => resctrl_rdtgroup.c} (99%)

diff --git a/arch/x86/include/asm/intel_rdt_sched.h b/arch/x86/include/asm/resctrl_sched.h
similarity index 100%
rename from arch/x86/include/asm/intel_rdt_sched.h
rename to arch/x86/include/asm/resctrl_sched.h
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 347137e80bf5..222cf8cc078d 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -35,9 +35,9 @@ obj-$(CONFIG_CPU_SUP_CENTAUR)		+= centaur.o
 obj-$(CONFIG_CPU_SUP_TRANSMETA_32)	+= transmeta.o
 obj-$(CONFIG_CPU_SUP_UMC_32)		+= umc.o
 
-obj-$(CONFIG_INTEL_RDT)	+= intel_rdt.o intel_rdt_rdtgroup.o intel_rdt_monitor.o
-obj-$(CONFIG_INTEL_RDT)	+= intel_rdt_ctrlmondata.o intel_rdt_pseudo_lock.o
-CFLAGS_intel_rdt_pseudo_lock.o = -I$(src)
+obj-$(CONFIG_INTEL_RDT)	+= resctrl.o resctrl_rdtgroup.o resctrl_monitor.o
+obj-$(CONFIG_INTEL_RDT)	+= resctrl_ctrlmondata.o resctrl_pseudo_lock.o
+CFLAGS_resctrl_pseudo_lock.o = -I$(src)
 
 obj-$(CONFIG_X86_MCE)			+= mcheck/
 obj-$(CONFIG_MTRR)			+= mtrr/
diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/resctrl.c
similarity index 99%
rename from arch/x86/kernel/cpu/intel_rdt.c
rename to arch/x86/kernel/cpu/resctrl.c
index 1214f3f7ec6d..3968b54902b1 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/resctrl.c
@@ -30,8 +30,8 @@
 #include <linux/cpuhotplug.h>
 
 #include <asm/intel-family.h>
-#include <asm/intel_rdt_sched.h>
-#include "intel_rdt.h"
+#include <asm/resctrl_sched.h>
+#include "resctrl.h"
 
 #define MBA_IS_LINEAR	0x4
 #define MBA_MAX_MBPS	U32_MAX
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/resctrl.h
similarity index 99%
rename from arch/x86/kernel/cpu/intel_rdt.h
rename to arch/x86/kernel/cpu/resctrl.h
index 3736f6dc9545..a9d906767bb2 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/resctrl.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_INTEL_RDT_H
-#define _ASM_X86_INTEL_RDT_H
+#ifndef _ASM_X86_RESCTRL_H
+#define _ASM_X86_RESCTRL_H
 
 #include <linux/sched.h>
 #include <linux/kernfs.h>
@@ -568,4 +568,4 @@ void cqm_handle_limbo(struct work_struct *work);
 bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
 void __check_limbo(struct rdt_domain *d, bool force_free);
 
-#endif /* _ASM_X86_INTEL_RDT_H */
+#endif /* _ASM_X86_RESCTRL_H */
diff --git a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c b/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
similarity index 99%
rename from arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
rename to arch/x86/kernel/cpu/resctrl_ctrlmondata.c
index 0f53049719cd..0c40a2e0a9b6 100644
--- a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
@@ -26,7 +26,7 @@
 #include <linux/kernfs.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
-#include "intel_rdt.h"
+#include "resctrl.h"
 
 /*
  * Check whether MBA bandwidth percentage value is correct. The value is
diff --git a/arch/x86/kernel/cpu/intel_rdt_monitor.c b/arch/x86/kernel/cpu/resctrl_monitor.c
similarity index 99%
rename from arch/x86/kernel/cpu/intel_rdt_monitor.c
rename to arch/x86/kernel/cpu/resctrl_monitor.c
index b0f3aed76b75..211d97bcbde5 100644
--- a/arch/x86/kernel/cpu/intel_rdt_monitor.c
+++ b/arch/x86/kernel/cpu/resctrl_monitor.c
@@ -26,7 +26,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <asm/cpu_device_id.h>
-#include "intel_rdt.h"
+#include "resctrl.h"
 
 #define MSR_IA32_QM_CTR		0x0c8e
 #define MSR_IA32_QM_EVTSEL		0x0c8d
diff --git a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c b/arch/x86/kernel/cpu/resctrl_pseudo_lock.c
similarity index 99%
rename from arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
rename to arch/x86/kernel/cpu/resctrl_pseudo_lock.c
index 41aeb431e834..67c747b6c61e 100644
--- a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl_pseudo_lock.c
@@ -24,14 +24,14 @@
 
 #include <asm/cacheflush.h>
 #include <asm/intel-family.h>
-#include <asm/intel_rdt_sched.h>
+#include <asm/resctrl_sched.h>
 #include <asm/perf_event.h>
 
 #include "../../events/perf_event.h" /* For X86_CONFIG() */
-#include "intel_rdt.h"
+#include "resctrl.h"
 
 #define CREATE_TRACE_POINTS
-#include "intel_rdt_pseudo_lock_event.h"
+#include "resctrl_pseudo_lock_event.h"
 
 /*
  * MSR_MISC_FEATURE_CONTROL register enables the modification of hardware
diff --git a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock_event.h b/arch/x86/kernel/cpu/resctrl_pseudo_lock_event.h
similarity index 95%
rename from arch/x86/kernel/cpu/intel_rdt_pseudo_lock_event.h
rename to arch/x86/kernel/cpu/resctrl_pseudo_lock_event.h
index 2c041e6d9f05..d354851ed66c 100644
--- a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock_event.h
+++ b/arch/x86/kernel/cpu/resctrl_pseudo_lock_event.h
@@ -39,5 +39,5 @@ TRACE_EVENT(pseudo_lock_l3,
 
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
-#define TRACE_INCLUDE_FILE intel_rdt_pseudo_lock_event
+#define TRACE_INCLUDE_FILE resctrl_pseudo_lock_event
 #include <trace/define_trace.h>
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/resctrl_rdtgroup.c
similarity index 99%
rename from arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
rename to arch/x86/kernel/cpu/resctrl_rdtgroup.c
index dbc7fc98b60a..7a0c9aad89f9 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl_rdtgroup.c
@@ -35,8 +35,8 @@
 
 #include <uapi/linux/magic.h>
 
-#include <asm/intel_rdt_sched.h>
-#include "intel_rdt.h"
+#include <asm/resctrl_sched.h>
+#include "resctrl.h"
 
 DEFINE_STATIC_KEY_FALSE(rdt_enable_key);
 DEFINE_STATIC_KEY_FALSE(rdt_mon_enable_key);
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 5046a3c9dec2..d16207e7d1e5 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -56,7 +56,7 @@
 #include <asm/debugreg.h>
 #include <asm/switch_to.h>
 #include <asm/vm86.h>
-#include <asm/intel_rdt_sched.h>
+#include <asm/resctrl_sched.h>
 #include <asm/proto.h>
 
 void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index ea5ea850348d..af73223ad6ba 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -52,7 +52,7 @@
 #include <asm/switch_to.h>
 #include <asm/xen/hypervisor.h>
 #include <asm/vdso.h>
-#include <asm/intel_rdt_sched.h>
+#include <asm/resctrl_sched.h>
 #include <asm/unistd.h>
 #ifdef CONFIG_IA32_EMULATION
 /* Not included via unistd.h */
-- 
2.17.1

Re: [PATCH v3 01/11] arch/x86: Start renaming the rdt files to more generic names

[Reinette Chatre]

Hi Babu,

On 10/11/2018 1:33 PM, Moger, Babu wrote:
> New generation of AMD processors start supporting RDT(or QOS) features.
> With more than one vendors supporting these features, it seems more
> appropriate to rename these files.
> 
> Changed intel_rdt to resctrl where applicable.
> 
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> ---
>  arch/x86/include/asm/{intel_rdt_sched.h => resctrl_sched.h} | 0
>  arch/x86/kernel/cpu/Makefile                                | 6 +++---
>  arch/x86/kernel/cpu/{intel_rdt.c => resctrl.c}              | 4 ++--
>  arch/x86/kernel/cpu/{intel_rdt.h => resctrl.h}              | 6 +++---
>  .../cpu/{intel_rdt_ctrlmondata.c => resctrl_ctrlmondata.c}  | 2 +-
>  .../kernel/cpu/{intel_rdt_monitor.c => resctrl_monitor.c}   | 2 +-
>  .../cpu/{intel_rdt_pseudo_lock.c => resctrl_pseudo_lock.c}  | 6 +++---
>  ..._rdt_pseudo_lock_event.h => resctrl_pseudo_lock_event.h} | 2 +-
>  .../kernel/cpu/{intel_rdt_rdtgroup.c => resctrl_rdtgroup.c} | 4 ++--
>  arch/x86/kernel/process_32.c                                | 2 +-
>  arch/x86/kernel/process_64.c                                | 2 +-
>  11 files changed, 18 insertions(+), 18 deletions(-)
>  rename arch/x86/include/asm/{intel_rdt_sched.h => resctrl_sched.h} (100%)
>  rename arch/x86/kernel/cpu/{intel_rdt.c => resctrl.c} (99%)
>  rename arch/x86/kernel/cpu/{intel_rdt.h => resctrl.h} (99%)
>  rename arch/x86/kernel/cpu/{intel_rdt_ctrlmondata.c => resctrl_ctrlmondata.c} (99%)
>  rename arch/x86/kernel/cpu/{intel_rdt_monitor.c => resctrl_monitor.c} (99%)
>  rename arch/x86/kernel/cpu/{intel_rdt_pseudo_lock.c => resctrl_pseudo_lock.c} (99%)
>  rename arch/x86/kernel/cpu/{intel_rdt_pseudo_lock_event.h => resctrl_pseudo_lock_event.h} (95%)
>  rename arch/x86/kernel/cpu/{intel_rdt_rdtgroup.c => resctrl_rdtgroup.c} (99%)
> 

I missed this earlier ... this change creates a need to change the
MAINTAINERS file. There were some other things that a run of
"checkpatch.pl --strict" picked up in the other patches that you could
consider.

Reinette

Re: [PATCH v3 01/11] arch/x86: Start renaming the rdt files to more generic names

[Moger, Babu]

Hi Reinette,

On 10/12/2018 02:07 PM, Reinette Chatre wrote:
> Hi Babu,
> 
> On 10/11/2018 1:33 PM, Moger, Babu wrote:
>> New generation of AMD processors start supporting RDT(or QOS) features.
>> With more than one vendors supporting these features, it seems more
>> appropriate to rename these files.
>>
>> Changed intel_rdt to resctrl where applicable.
>>
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> ---
>>  arch/x86/include/asm/{intel_rdt_sched.h => resctrl_sched.h} | 0
>>  arch/x86/kernel/cpu/Makefile                                | 6 +++---
>>  arch/x86/kernel/cpu/{intel_rdt.c => resctrl.c}              | 4 ++--
>>  arch/x86/kernel/cpu/{intel_rdt.h => resctrl.h}              | 6 +++---
>>  .../cpu/{intel_rdt_ctrlmondata.c => resctrl_ctrlmondata.c}  | 2 +-
>>  .../kernel/cpu/{intel_rdt_monitor.c => resctrl_monitor.c}   | 2 +-
>>  .../cpu/{intel_rdt_pseudo_lock.c => resctrl_pseudo_lock.c}  | 6 +++---
>>  ..._rdt_pseudo_lock_event.h => resctrl_pseudo_lock_event.h} | 2 +-
>>  .../kernel/cpu/{intel_rdt_rdtgroup.c => resctrl_rdtgroup.c} | 4 ++--
>>  arch/x86/kernel/process_32.c                                | 2 +-
>>  arch/x86/kernel/process_64.c                                | 2 +-
>>  11 files changed, 18 insertions(+), 18 deletions(-)
>>  rename arch/x86/include/asm/{intel_rdt_sched.h => resctrl_sched.h} (100%)
>>  rename arch/x86/kernel/cpu/{intel_rdt.c => resctrl.c} (99%)
>>  rename arch/x86/kernel/cpu/{intel_rdt.h => resctrl.h} (99%)
>>  rename arch/x86/kernel/cpu/{intel_rdt_ctrlmondata.c => resctrl_ctrlmondata.c} (99%)
>>  rename arch/x86/kernel/cpu/{intel_rdt_monitor.c => resctrl_monitor.c} (99%)
>>  rename arch/x86/kernel/cpu/{intel_rdt_pseudo_lock.c => resctrl_pseudo_lock.c} (99%)
>>  rename arch/x86/kernel/cpu/{intel_rdt_pseudo_lock_event.h => resctrl_pseudo_lock_event.h} (95%)
>>  rename arch/x86/kernel/cpu/{intel_rdt_rdtgroup.c => resctrl_rdtgroup.c} (99%)
>>
> 
> I missed this earlier ... this change creates a need to change the
> MAINTAINERS file. There were some other things that a run of

Yes. I see that now. We need to update MAINTAINERS file.
The file name Documentation/x86/intel_rdt_ui.txt needs rename. Also
contents of the file needs some minor changes. Will take care of it in
next revision.

> "checkpatch.pl --strict" picked up in the other patches that you could
> consider.

Yes. With --strict I see some more warnings. Will try to fix most of it.
Sorry, I did not run --strict before. There are couple of "line over 80
characters" warnings which are difficult to handle. I will skip those.

> 
> Reinette
> 

[PATCH v3 02/11] arch/x86: Rename the RDT functions and definitions

[Moger, Babu]

As AMD is starting to support RDT(or QOS) features, rename
the RDT functions and definitions to more generic names.

Replace intel_rdt to resctrl where applicable.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/include/asm/resctrl_sched.h   | 24 ++++++++++++------------
 arch/x86/kernel/cpu/resctrl.c          | 26 +++++++++++++-------------
 arch/x86/kernel/cpu/resctrl.h          |  2 +-
 arch/x86/kernel/cpu/resctrl_monitor.c  | 11 ++++++-----
 arch/x86/kernel/cpu/resctrl_rdtgroup.c | 10 +++++-----
 arch/x86/kernel/process_32.c           |  2 +-
 arch/x86/kernel/process_64.c           |  2 +-
 7 files changed, 39 insertions(+), 38 deletions(-)

diff --git a/arch/x86/include/asm/resctrl_sched.h b/arch/x86/include/asm/resctrl_sched.h
index 9acb06b6f81e..6e082697a613 100644
--- a/arch/x86/include/asm/resctrl_sched.h
+++ b/arch/x86/include/asm/resctrl_sched.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_INTEL_RDT_SCHED_H
-#define _ASM_X86_INTEL_RDT_SCHED_H
+#ifndef _ASM_X86_RESCTRL_SCHED_H
+#define _ASM_X86_RESCTRL_SCHED_H
 
 #ifdef CONFIG_INTEL_RDT
 
@@ -10,7 +10,7 @@
 #define IA32_PQR_ASSOC	0x0c8f
 
 /**
- * struct intel_pqr_state - State cache for the PQR MSR
+ * struct resctrl_pqr_state - State cache for the PQR MSR
  * @cur_rmid:		The cached Resource Monitoring ID
  * @cur_closid:	The cached Class Of Service ID
  * @default_rmid:	The user assigned Resource Monitoring ID
@@ -24,21 +24,21 @@
  * The cache also helps to avoid pointless updates if the value does
  * not change.
  */
-struct intel_pqr_state {
+struct resctrl_pqr_state {
 	u32			cur_rmid;
 	u32			cur_closid;
 	u32			default_rmid;
 	u32			default_closid;
 };
 
-DECLARE_PER_CPU(struct intel_pqr_state, pqr_state);
+DECLARE_PER_CPU(struct resctrl_pqr_state, pqr_state);
 
 DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
 DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
 DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
 
 /*
- * __intel_rdt_sched_in() - Writes the task's CLOSid/RMID to IA32_PQR_MSR
+ * __resctrl_sched_in() - Writes the task's CLOSid/RMID to IA32_PQR_MSR
  *
  * Following considerations are made so that this has minimal impact
  * on scheduler hot path:
@@ -51,9 +51,9 @@ DECLARE_STATIC_KEY_FALSE(rdt_mon_enable_key);
  *   simple as possible.
  * Must be called with preemption disabled.
  */
-static void __intel_rdt_sched_in(void)
+static void __resctrl_sched_in(void)
 {
-	struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);
+	struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state);
 	u32 closid = state->default_closid;
 	u32 rmid = state->default_rmid;
 
@@ -78,16 +78,16 @@ static void __intel_rdt_sched_in(void)
 	}
 }
 
-static inline void intel_rdt_sched_in(void)
+static inline void resctrl_sched_in(void)
 {
 	if (static_branch_likely(&rdt_enable_key))
-		__intel_rdt_sched_in();
+		__resctrl_sched_in();
 }
 
 #else
 
-static inline void intel_rdt_sched_in(void) {}
+static inline void resctrl_sched_in(void) {}
 
 #endif /* CONFIG_INTEL_RDT */
 
-#endif /* _ASM_X86_INTEL_RDT_SCHED_H */
+#endif /* _ASM_X86_RESCTRL_SCHED_H */
diff --git a/arch/x86/kernel/cpu/resctrl.c b/arch/x86/kernel/cpu/resctrl.c
index 3968b54902b1..07158963ca30 100644
--- a/arch/x86/kernel/cpu/resctrl.c
+++ b/arch/x86/kernel/cpu/resctrl.c
@@ -40,12 +40,12 @@
 DEFINE_MUTEX(rdtgroup_mutex);
 
 /*
- * The cached intel_pqr_state is strictly per CPU and can never be
+ * The cached resctrl_pqr_state is strictly per CPU and can never be
  * updated from a remote CPU. Functions which modify the state
  * are called with interrupts disabled and no preemption, which
  * is sufficient for the protection.
  */
-DEFINE_PER_CPU(struct intel_pqr_state, pqr_state);
+DEFINE_PER_CPU(struct resctrl_pqr_state, pqr_state);
 
 /*
  * Used to store the max resource name width and max resource data width
@@ -632,7 +632,7 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 
 static void clear_closid_rmid(int cpu)
 {
-	struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);
+	struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state);
 
 	state->default_closid = 0;
 	state->default_rmid = 0;
@@ -641,7 +641,7 @@ static void clear_closid_rmid(int cpu)
 	wrmsr(IA32_PQR_ASSOC, 0, 0);
 }
 
-static int intel_rdt_online_cpu(unsigned int cpu)
+static int resctrl_online_cpu(unsigned int cpu)
 {
 	struct rdt_resource *r;
 
@@ -667,7 +667,7 @@ static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
 	}
 }
 
-static int intel_rdt_offline_cpu(unsigned int cpu)
+static int resctrl_offline_cpu(unsigned int cpu)
 {
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
@@ -859,7 +859,7 @@ static __init bool get_rdt_resources(void)
 
 static enum cpuhp_state rdt_online;
 
-static int __init intel_rdt_late_init(void)
+static int __init resctrl_late_init(void)
 {
 	struct rdt_resource *r;
 	int state, ret;
@@ -870,8 +870,8 @@ static int __init intel_rdt_late_init(void)
 	rdt_init_padding();
 
 	state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
-				  "x86/rdt/cat:online:",
-				  intel_rdt_online_cpu, intel_rdt_offline_cpu);
+				  "x86/resctrl/cat:online:",
+				  resctrl_online_cpu, resctrl_offline_cpu);
 	if (state < 0)
 		return state;
 
@@ -883,20 +883,20 @@ static int __init intel_rdt_late_init(void)
 	rdt_online = state;
 
 	for_each_alloc_capable_rdt_resource(r)
-		pr_info("Intel RDT %s allocation detected\n", r->name);
+		pr_info("RESCTRL %s allocation detected\n", r->name);
 
 	for_each_mon_capable_rdt_resource(r)
-		pr_info("Intel RDT %s monitoring detected\n", r->name);
+		pr_info("RESCTRL %s monitoring detected\n", r->name);
 
 	return 0;
 }
 
-late_initcall(intel_rdt_late_init);
+late_initcall(resctrl_late_init);
 
-static void __exit intel_rdt_exit(void)
+static void __exit resctrl_exit(void)
 {
 	cpuhp_remove_state(rdt_online);
 	rdtgroup_exit();
 }
 
-__exitcall(intel_rdt_exit);
+__exitcall(resctrl_exit);
diff --git a/arch/x86/kernel/cpu/resctrl.h b/arch/x86/kernel/cpu/resctrl.h
index a9d906767bb2..abf5c7e4c625 100644
--- a/arch/x86/kernel/cpu/resctrl.h
+++ b/arch/x86/kernel/cpu/resctrl.h
@@ -69,7 +69,7 @@ struct rmid_read {
 	u64			val;
 };
 
-extern unsigned int intel_cqm_threshold;
+extern unsigned int resctrl_cqm_threshold;
 extern bool rdt_alloc_capable;
 extern bool rdt_mon_capable;
 extern unsigned int rdt_mon_features;
diff --git a/arch/x86/kernel/cpu/resctrl_monitor.c b/arch/x86/kernel/cpu/resctrl_monitor.c
index 211d97bcbde5..68dbdbbf47df 100644
--- a/arch/x86/kernel/cpu/resctrl_monitor.c
+++ b/arch/x86/kernel/cpu/resctrl_monitor.c
@@ -73,7 +73,7 @@ unsigned int rdt_mon_features;
  * This is the threshold cache occupancy at which we will consider an
  * RMID available for re-allocation.
  */
-unsigned int intel_cqm_threshold;
+unsigned int resctrl_cqm_threshold;
 
 static inline struct rmid_entry *__rmid_entry(u32 rmid)
 {
@@ -107,7 +107,7 @@ static bool rmid_dirty(struct rmid_entry *entry)
 {
 	u64 val = __rmid_read(entry->rmid, QOS_L3_OCCUP_EVENT_ID);
 
-	return val >= intel_cqm_threshold;
+	return val >= resctrl_cqm_threshold;
 }
 
 /*
@@ -187,7 +187,7 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
 	list_for_each_entry(d, &r->domains, list) {
 		if (cpumask_test_cpu(cpu, &d->cpu_mask)) {
 			val = __rmid_read(entry->rmid, QOS_L3_OCCUP_EVENT_ID);
-			if (val <= intel_cqm_threshold)
+			if (val <= resctrl_cqm_threshold)
 				continue;
 		}
 
@@ -637,10 +637,11 @@ int rdt_get_mon_l3_config(struct rdt_resource *r)
 	 *
 	 * For a 35MB LLC and 56 RMIDs, this is ~1.8% of the LLC.
 	 */
-	intel_cqm_threshold = boot_cpu_data.x86_cache_size * 1024 / r->num_rmid;
+	resctrl_cqm_threshold = boot_cpu_data.x86_cache_size * 1024 /
+				r->num_rmid;
 
 	/* h/w works in units of "boot_cpu_data.x86_cache_occ_scale" */
-	intel_cqm_threshold /= r->mon_scale;
+	resctrl_cqm_threshold /= r->mon_scale;
 
 	ret = dom_data_init(r);
 	if (ret)
diff --git a/arch/x86/kernel/cpu/resctrl_rdtgroup.c b/arch/x86/kernel/cpu/resctrl_rdtgroup.c
index 7a0c9aad89f9..879ff9206f42 100644
--- a/arch/x86/kernel/cpu/resctrl_rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl_rdtgroup.c
@@ -288,7 +288,7 @@ static int rdtgroup_cpus_show(struct kernfs_open_file *of,
 }
 
 /*
- * This is safe against intel_rdt_sched_in() called from __switch_to()
+ * This is safe against resctrl_sched_in() called from __switch_to()
  * because __switch_to() is executed with interrupts disabled. A local call
  * from update_closid_rmid() is proteced against __switch_to() because
  * preemption is disabled.
@@ -307,7 +307,7 @@ static void update_cpu_closid_rmid(void *info)
 	 * executing task might have its own closid selected. Just reuse
 	 * the context switch code.
 	 */
-	intel_rdt_sched_in();
+	resctrl_sched_in();
 }
 
 /*
@@ -532,7 +532,7 @@ static void move_myself(struct callback_head *head)
 
 	preempt_disable();
 	/* update PQR_ASSOC MSR to make resource group go into effect */
-	intel_rdt_sched_in();
+	resctrl_sched_in();
 	preempt_enable();
 
 	kfree(callback);
@@ -916,7 +916,7 @@ static int max_threshold_occ_show(struct kernfs_open_file *of,
 {
 	struct rdt_resource *r = of->kn->parent->priv;
 
-	seq_printf(seq, "%u\n", intel_cqm_threshold * r->mon_scale);
+	seq_printf(seq, "%u\n", resctrl_cqm_threshold * r->mon_scale);
 
 	return 0;
 }
@@ -935,7 +935,7 @@ static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
 	if (bytes > (boot_cpu_data.x86_cache_size * 1024))
 		return -EINVAL;
 
-	intel_cqm_threshold = bytes / r->mon_scale;
+	resctrl_cqm_threshold = bytes / r->mon_scale;
 
 	return nbytes;
 }
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index d16207e7d1e5..dc4d92764d1a 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -302,7 +302,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 	this_cpu_write(current_task, next_p);
 
 	/* Load the Intel cache allocation PQR MSR. */
-	intel_rdt_sched_in();
+	resctrl_sched_in();
 
 	return prev_p;
 }
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index af73223ad6ba..5ada7354b5d4 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -536,7 +536,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 	}
 
 	/* Load the Intel cache allocation PQR MSR. */
-	intel_rdt_sched_in();
+	resctrl_sched_in();
 
 	return prev_p;
 }
-- 
2.17.1

Re: [PATCH v3 02/11] arch/x86: Rename the RDT functions and definitions

[Reinette Chatre]

Hi Babu,

On 10/11/2018 1:33 PM, Moger, Babu wrote:
> @@ -883,20 +883,20 @@ static int __init intel_rdt_late_init(void)
>  	rdt_online = state;
>  
>  	for_each_alloc_capable_rdt_resource(r)
> -		pr_info("Intel RDT %s allocation detected\n", r->name);
> +		pr_info("RESCTRL %s allocation detected\n", r->name);
>  
>  	for_each_mon_capable_rdt_resource(r)
> -		pr_info("Intel RDT %s monitoring detected\n", r->name);
> +		pr_info("RESCTRL %s monitoring detected\n", r->name);
>  

I'm sorry - I know it was me who suggested the change to RESCTRL but I
clearly did not consider the final result which is (for example):

resctrl: RESCTRL %s allocation detected

Perhaps we could just drop that RESCTRL text?

Reinette

Re: [PATCH v3 02/11] arch/x86: Rename the RDT functions and definitions

[Moger, Babu]

On 10/12/2018 02:40 PM, Reinette Chatre wrote:
> Hi Babu,
> 
> On 10/11/2018 1:33 PM, Moger, Babu wrote:
>> @@ -883,20 +883,20 @@ static int __init intel_rdt_late_init(void)
>>  	rdt_online = state;
>>  
>>  	for_each_alloc_capable_rdt_resource(r)
>> -		pr_info("Intel RDT %s allocation detected\n", r->name);
>> +		pr_info("RESCTRL %s allocation detected\n", r->name);
>>  
>>  	for_each_mon_capable_rdt_resource(r)
>> -		pr_info("Intel RDT %s monitoring detected\n", r->name);
>> +		pr_info("RESCTRL %s monitoring detected\n", r->name);
>>  
> 
> I'm sorry - I know it was me who suggested the change to RESCTRL but I
> clearly did not consider the final result which is (for example):
> 
> resctrl: RESCTRL %s allocation detected
> 
> Perhaps we could just drop that RESCTRL text?

Yes. We can drop it.

> 
> Reinette
> 

[PATCH v3 03/11] arch/x86: Re-arrange RDT init code

[Moger, Babu]

Separate the call sequence for rdt_quirks and MBA feature.
This is in preparation to handle vendor differences in these
call sequences.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl.c b/arch/x86/kernel/cpu/resctrl.c
index 07158963ca30..2c564301e008 100644
--- a/arch/x86/kernel/cpu/resctrl.c
+++ b/arch/x86/kernel/cpu/resctrl.c
@@ -787,6 +787,16 @@ static bool __init rdt_cpu_has(int flag)
 	return ret;
 }
 
+static __init bool rdt_mba_config(void)
+{
+	if (rdt_cpu_has(X86_FEATURE_MBA)) {
+		if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
+			return true;
+	}
+
+	return false;
+}
+
 static __init bool get_rdt_alloc_resources(void)
 {
 	bool ret = false;
@@ -811,10 +821,9 @@ static __init bool get_rdt_alloc_resources(void)
 		ret = true;
 	}
 
-	if (rdt_cpu_has(X86_FEATURE_MBA)) {
-		if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
-			ret = true;
-	}
+	if (rdt_mba_config())
+		ret = true;
+
 	return ret;
 }
 
@@ -833,7 +842,7 @@ static __init bool get_rdt_mon_resources(void)
 	return !rdt_get_mon_l3_config(&rdt_resources_all[RDT_RESOURCE_L3]);
 }
 
-static __init void rdt_quirks(void)
+static __init void rdt_quirks_intel(void)
 {
 	switch (boot_cpu_data.x86_model) {
 	case INTEL_FAM6_HASWELL_X:
@@ -848,9 +857,14 @@ static __init void rdt_quirks(void)
 	}
 }
 
+static __init void rdt_quirks(void)
+{
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+		rdt_quirks_intel();
+}
+
 static __init bool get_rdt_resources(void)
 {
-	rdt_quirks();
 	rdt_alloc_capable = get_rdt_alloc_resources();
 	rdt_mon_capable = get_rdt_mon_resources();
 
@@ -864,6 +878,9 @@ static int __init resctrl_late_init(void)
 	struct rdt_resource *r;
 	int state, ret;
 
+	/* Run quirks first */
+	rdt_quirks();
+
 	if (!get_rdt_resources())
 		return -ENODEV;
 
-- 
2.17.1

[PATCH v3 04/11] arch/x86: Bring all the macros to resctrl.h

[Moger, Babu]

Bring all the macros to resctrl.h and rename for consistency.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl.c         | 3 ---
 arch/x86/kernel/cpu/resctrl.h         | 5 +++++
 arch/x86/kernel/cpu/resctrl_monitor.c | 7 ++-----
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl.c b/arch/x86/kernel/cpu/resctrl.c
index 2c564301e008..9c5480750069 100644
--- a/arch/x86/kernel/cpu/resctrl.c
+++ b/arch/x86/kernel/cpu/resctrl.c
@@ -33,9 +33,6 @@
 #include <asm/resctrl_sched.h>
 #include "resctrl.h"
 
-#define MBA_IS_LINEAR	0x4
-#define MBA_MAX_MBPS	U32_MAX
-
 /* Mutex to protect rdtgroup access. */
 DEFINE_MUTEX(rdtgroup_mutex);
 
diff --git a/arch/x86/kernel/cpu/resctrl.h b/arch/x86/kernel/cpu/resctrl.h
index abf5c7e4c625..e5f7bf6a8d09 100644
--- a/arch/x86/kernel/cpu/resctrl.h
+++ b/arch/x86/kernel/cpu/resctrl.h
@@ -12,6 +12,9 @@
 #define IA32_L2_CBM_BASE	0xd10
 #define IA32_MBA_THRTL_BASE	0xd50
 
+#define IA32_QM_CTR		0x0c8e
+#define IA32_QM_EVTSEL		0x0c8d
+
 #define L3_QOS_CDP_ENABLE	0x01ULL
 
 #define L2_QOS_CDP_ENABLE	0x01ULL
@@ -29,6 +32,8 @@
 #define MBM_CNTR_WIDTH			24
 #define MBM_OVERFLOW_INTERVAL		1000
 #define MAX_MBA_BW			100u
+#define MBA_IS_LINEAR			0x4
+#define MBA_MAX_MBPS			U32_MAX
 
 #define RMID_VAL_ERROR			BIT_ULL(63)
 #define RMID_VAL_UNAVAIL		BIT_ULL(62)
diff --git a/arch/x86/kernel/cpu/resctrl_monitor.c b/arch/x86/kernel/cpu/resctrl_monitor.c
index 68dbdbbf47df..ad0107bc16a0 100644
--- a/arch/x86/kernel/cpu/resctrl_monitor.c
+++ b/arch/x86/kernel/cpu/resctrl_monitor.c
@@ -28,9 +28,6 @@
 #include <asm/cpu_device_id.h>
 #include "resctrl.h"
 
-#define MSR_IA32_QM_CTR		0x0c8e
-#define MSR_IA32_QM_EVTSEL		0x0c8d
-
 struct rmid_entry {
 	u32				rmid;
 	int				busy;
@@ -97,8 +94,8 @@ static u64 __rmid_read(u32 rmid, u32 eventid)
 	 * IA32_QM_CTR.Error (bit 63) and IA32_QM_CTR.Unavailable (bit 62)
 	 * are error bits.
 	 */
-	wrmsr(MSR_IA32_QM_EVTSEL, eventid, rmid);
-	rdmsrl(MSR_IA32_QM_CTR, val);
+	wrmsr(IA32_QM_EVTSEL, eventid, rmid);
+	rdmsrl(IA32_QM_CTR, val);
 
 	return val;
 }
-- 
2.17.1

[PATCH v3 05/11] arch/x86: Introduce a new config parameter RESCTRL

[Moger, Babu]

Introduces a new config parameter RESCTRL.

This will be used as a common config parameter for both Intel and AMD.
Each vendor will have their own config parameter to enable RDT feature.
One for Intel(INTEL_RDT) and one for AMD(AMD_QOS). It can be enabled or
disabled separately. The new parameter RESCTRL will be dependent on
INTEL_RDT or AMD_QOS.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1a0be022f91d..91a703ebdc04 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -458,6 +458,10 @@ config INTEL_RDT
 
 	  Say N if unsure.
 
+config RESCTRL
+	def_bool y
+	depends on X86 && INTEL_RDT
+
 if X86_32
 config X86_BIGSMP
 	bool "Support for big SMP systems with more than 8 CPUs"
-- 
2.17.1

[PATCH v3 06/11] arch/x86: Use new config parameter RESCTRL for compilation

[Moger, Babu]

Use newly added config parameter RESCTRL to compile sources.
This is common parameter across both Intel and AMD.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/include/asm/resctrl_sched.h | 4 ++--
 arch/x86/kernel/cpu/Makefile         | 4 ++--
 include/linux/sched.h                | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/resctrl_sched.h b/arch/x86/include/asm/resctrl_sched.h
index 6e082697a613..54990fe2a3ae 100644
--- a/arch/x86/include/asm/resctrl_sched.h
+++ b/arch/x86/include/asm/resctrl_sched.h
@@ -2,7 +2,7 @@
 #ifndef _ASM_X86_RESCTRL_SCHED_H
 #define _ASM_X86_RESCTRL_SCHED_H
 
-#ifdef CONFIG_INTEL_RDT
+#ifdef CONFIG_RESCTRL
 
 #include <linux/sched.h>
 #include <linux/jump_label.h>
@@ -88,6 +88,6 @@ static inline void resctrl_sched_in(void)
 
 static inline void resctrl_sched_in(void) {}
 
-#endif /* CONFIG_INTEL_RDT */
+#endif /* CONFIG_RESCTRL */
 
 #endif /* _ASM_X86_RESCTRL_SCHED_H */
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 222cf8cc078d..79279953c5f9 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -35,8 +35,8 @@ obj-$(CONFIG_CPU_SUP_CENTAUR)		+= centaur.o
 obj-$(CONFIG_CPU_SUP_TRANSMETA_32)	+= transmeta.o
 obj-$(CONFIG_CPU_SUP_UMC_32)		+= umc.o
 
-obj-$(CONFIG_INTEL_RDT)	+= resctrl.o resctrl_rdtgroup.o resctrl_monitor.o
-obj-$(CONFIG_INTEL_RDT)	+= resctrl_ctrlmondata.o resctrl_pseudo_lock.o
+obj-$(CONFIG_RESCTRL)	+= resctrl.o resctrl_rdtgroup.o resctrl_monitor.o
+obj-$(CONFIG_RESCTRL)	+= resctrl_ctrlmondata.o resctrl_pseudo_lock.o
 CFLAGS_resctrl_pseudo_lock.o = -I$(src)
 
 obj-$(CONFIG_X86_MCE)			+= mcheck/
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 977cb57d7bc9..c4cf94c447b2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -985,7 +985,7 @@ struct task_struct {
 	/* cg_list protected by css_set_lock and tsk->alloc_lock: */
 	struct list_head		cg_list;
 #endif
-#ifdef CONFIG_INTEL_RDT
+#ifdef CONFIG_RESCTRL
 	u32				closid;
 	u32				rmid;
 #endif
-- 
2.17.1

[PATCH v3 07/11] arch/x86: Initialize the resource functions that are different

[Moger, Babu]

Initialize the resource functions that are different between the
vendors. Some features are initialized differently between the vendors.
Add _intel suffix to Intel specific functions.

For example, MBA feature varies significantly between Intel and AMD.
Separate the initialization of these resource functions. That way we
can easily add AMD's functions later.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl.c             | 34 +++++++++++++++++++----
 arch/x86/kernel/cpu/resctrl.h             |  8 ++++--
 arch/x86/kernel/cpu/resctrl_ctrlmondata.c |  4 +--
 3 files changed, 37 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl.c b/arch/x86/kernel/cpu/resctrl.c
index 9c5480750069..cff5564921c3 100644
--- a/arch/x86/kernel/cpu/resctrl.c
+++ b/arch/x86/kernel/cpu/resctrl.c
@@ -57,7 +57,8 @@ int max_name_width, max_data_width;
 bool rdt_alloc_capable;
 
 static void
-mba_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);
+mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
+		struct rdt_resource *r);
 static void
 cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);
 
@@ -171,10 +172,7 @@ struct rdt_resource rdt_resources_all[] = {
 		.rid			= RDT_RESOURCE_MBA,
 		.name			= "MB",
 		.domains		= domain_init(RDT_RESOURCE_MBA),
-		.msr_base		= IA32_MBA_THRTL_BASE,
-		.msr_update		= mba_wrmsr,
 		.cache_level		= 3,
-		.parse_ctrlval		= parse_bw,
 		.format_str		= "%d=%*u",
 		.fflags			= RFTYPE_RES_MB,
 	},
@@ -356,7 +354,8 @@ u32 delay_bw_map(unsigned long bw, struct rdt_resource *r)
 }
 
 static void
-mba_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
+mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
+		struct rdt_resource *r)
 {
 	unsigned int i;
 
@@ -868,6 +867,25 @@ static __init bool get_rdt_resources(void)
 	return (rdt_mon_capable || rdt_alloc_capable);
 }
 
+static __init void rdt_init_res_defs_intel(void)
+{
+	struct rdt_resource *r;
+
+	for_each_rdt_resource(r) {
+		if (r->rid == RDT_RESOURCE_MBA) {
+			r->msr_base = IA32_MBA_THRTL_BASE;
+			r->msr_update = mba_wrmsr_intel;
+			r->parse_ctrlval = parse_bw_intel;
+		}
+	}
+}
+
+static __init void rdt_init_res_defs(void)
+{
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+		rdt_init_res_defs_intel();
+}
+
 static enum cpuhp_state rdt_online;
 
 static int __init resctrl_late_init(void)
@@ -875,6 +893,12 @@ static int __init resctrl_late_init(void)
 	struct rdt_resource *r;
 	int state, ret;
 
+	/*
+	 * Initialize functions(or definitions) that are different
+	 * between vendors here.
+	 */
+	rdt_init_res_defs();
+
 	/* Run quirks first */
 	rdt_quirks();
 
diff --git a/arch/x86/kernel/cpu/resctrl.h b/arch/x86/kernel/cpu/resctrl.h
index e5f7bf6a8d09..8731b7c91c28 100644
--- a/arch/x86/kernel/cpu/resctrl.h
+++ b/arch/x86/kernel/cpu/resctrl.h
@@ -444,8 +444,8 @@ struct rdt_resource {
 
 int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 	      struct rdt_domain *d);
-int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
-	     struct rdt_domain *d);
+int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
+		   struct rdt_domain *d);
 
 extern struct mutex rdtgroup_mutex;
 
@@ -468,6 +468,10 @@ enum {
 	RDT_NUM_RESOURCES,
 };
 
+#define for_each_rdt_resource(r)					      \
+	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
+	     r++)
+
 #define for_each_capable_rdt_resource(r)				      \
 	for (r = rdt_resources_all; r < rdt_resources_all + RDT_NUM_RESOURCES;\
 	     r++)							      \
diff --git a/arch/x86/kernel/cpu/resctrl_ctrlmondata.c b/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
index 0c40a2e0a9b6..1da343b69f6e 100644
--- a/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
@@ -64,8 +64,8 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
 	return true;
 }
 
-int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
-	     struct rdt_domain *d)
+int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
+		   struct rdt_domain *d)
 {
 	unsigned long bw_val;
 
-- 
2.17.1

[PATCH v3 08/11] arch/x86: Bring few more functions into the resource structure

[Moger, Babu]

Bring all resource functions that are different between the vendors
into resource structure and initialize them dynamically.
Add _intel suffix to Intel specific functions.

Implement these functions separately for each vendors.
update_mba_bw : Feedback loop bandwidth update functionality is not
                needed for AMD.
cbm_validate  : Cache bitmask validate function. AMD allows
                non-contiguous masks. So, use separate functions for
                Intel and AMD.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl.c             | 10 +++++++++-
 arch/x86/kernel/cpu/resctrl.h             | 15 +++++++++++----
 arch/x86/kernel/cpu/resctrl_ctrlmondata.c |  4 ++--
 arch/x86/kernel/cpu/resctrl_monitor.c     | 10 +++++++---
 4 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl.c b/arch/x86/kernel/cpu/resctrl.c
index cff5564921c3..9eb5c102c300 100644
--- a/arch/x86/kernel/cpu/resctrl.c
+++ b/arch/x86/kernel/cpu/resctrl.c
@@ -872,10 +872,18 @@ static __init void rdt_init_res_defs_intel(void)
 	struct rdt_resource *r;
 
 	for_each_rdt_resource(r) {
-		if (r->rid == RDT_RESOURCE_MBA) {
+		if ((r->rid == RDT_RESOURCE_L3) ||
+		    (r->rid == RDT_RESOURCE_L3DATA) ||
+		    (r->rid == RDT_RESOURCE_L3CODE) ||
+		    (r->rid == RDT_RESOURCE_L2) ||
+		    (r->rid == RDT_RESOURCE_L2DATA) ||
+		    (r->rid == RDT_RESOURCE_L2CODE))
+			r->cbm_validate = cbm_validate_intel;
+		else if (r->rid == RDT_RESOURCE_MBA) {
 			r->msr_base = IA32_MBA_THRTL_BASE;
 			r->msr_update = mba_wrmsr_intel;
 			r->parse_ctrlval = parse_bw_intel;
+			r->update_mba_bw = update_mba_bw_intel;
 		}
 	}
 }
diff --git a/arch/x86/kernel/cpu/resctrl.h b/arch/x86/kernel/cpu/resctrl.h
index 8731b7c91c28..825d5571539e 100644
--- a/arch/x86/kernel/cpu/resctrl.h
+++ b/arch/x86/kernel/cpu/resctrl.h
@@ -410,10 +410,12 @@ struct rdt_parse_data {
  * @cache:		Cache allocation related data
  * @format_str:		Per resource format string to show domain value
  * @parse_ctrlval:	Per resource function pointer to parse control values
- * @evt_list:			List of monitoring events
- * @num_rmid:			Number of RMIDs available
- * @mon_scale:			cqm counter * mon_scale = occupancy in bytes
- * @fflags:			flags to choose base and info files
+ * @update_mba_bw:	Feedback loop for MBA software controller function
+ * @cbm_validate	Cache bitmask validate function
+ * @evt_list:		List of monitoring events
+ * @num_rmid:		Number of RMIDs available
+ * @mon_scale:		cqm counter * mon_scale = occupancy in bytes
+ * @fflags:		flags to choose base and info files
  */
 struct rdt_resource {
 	int			rid;
@@ -436,6 +438,9 @@ struct rdt_resource {
 	int (*parse_ctrlval)(struct rdt_parse_data *data,
 			     struct rdt_resource *r,
 			     struct rdt_domain *d);
+	void (*update_mba_bw)(struct rdtgroup *rgrp,
+			      struct rdt_domain *dom_mbm);
+	bool (*cbm_validate)(char *buf, u32 *data, struct rdt_resource *r);
 	struct list_head	evt_list;
 	int			num_rmid;
 	unsigned int		mon_scale;
@@ -576,5 +581,7 @@ void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
 void cqm_handle_limbo(struct work_struct *work);
 bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
 void __check_limbo(struct rdt_domain *d, bool force_free);
+void update_mba_bw_intel(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm);
+bool cbm_validate_intel(char *buf, u32 *data, struct rdt_resource *r);
 
 #endif /* _ASM_X86_RESCTRL_H */
diff --git a/arch/x86/kernel/cpu/resctrl_ctrlmondata.c b/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
index 1da343b69f6e..867da06223b5 100644
--- a/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
@@ -88,7 +88,7 @@ int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
  *	are allowed (e.g. FFFFH, 0FF0H, 003CH, etc.).
  * Additionally Haswell requires at least two bits set.
  */
-static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
+bool cbm_validate_intel(char *buf, u32 *data, struct rdt_resource *r)
 {
 	unsigned long first_bit, zero_bit, val;
 	unsigned int cbm_len = r->cache.cbm_len;
@@ -148,7 +148,7 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 		return -EINVAL;
 	}
 
-	if (!cbm_validate(data->buf, &cbm_val, r))
+	if (r->cbm_validate && !r->cbm_validate(data->buf, &cbm_val, r))
 		return -EINVAL;
 
 	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
diff --git a/arch/x86/kernel/cpu/resctrl_monitor.c b/arch/x86/kernel/cpu/resctrl_monitor.c
index ad0107bc16a0..3c189e8624b9 100644
--- a/arch/x86/kernel/cpu/resctrl_monitor.c
+++ b/arch/x86/kernel/cpu/resctrl_monitor.c
@@ -358,7 +358,7 @@ void mon_event_count(void *info)
  * throttle MSRs already have low percentage values.  To avoid
  * unnecessarily restricting such rdtgroups, we also increase the bandwidth.
  */
-static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
+void update_mba_bw_intel(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 {
 	u32 closid, rmid, cur_msr, cur_msr_val, new_msr_val;
 	struct mbm_state *pmbm_data, *cmbm_data;
@@ -517,6 +517,7 @@ void mbm_handle_overflow(struct work_struct *work)
 	unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
 	struct rdtgroup *prgrp, *crgrp;
 	int cpu = smp_processor_id();
+	struct rdt_resource *r_mba;
 	struct list_head *head;
 	struct rdt_domain *d;
 
@@ -536,8 +537,11 @@ void mbm_handle_overflow(struct work_struct *work)
 		list_for_each_entry(crgrp, head, mon.crdtgrp_list)
 			mbm_update(d, crgrp->mon.rmid);
 
-		if (is_mba_sc(NULL))
-			update_mba_bw(prgrp, d);
+		if (is_mba_sc(NULL)) {
+			r_mba = &rdt_resources_all[RDT_RESOURCE_MBA];
+			if (r_mba->update_mba_bw)
+				r_mba->update_mba_bw(prgrp, d);
+		}
 	}
 
 	schedule_delayed_work_on(cpu, &d->mbm_over, delay);
-- 
2.17.1

[PATCH v3 09/11] arch/x86: Introduce new config parameter AMD_QOS

[Moger, Babu]

Introduces the new config parameter AMD_QOS. This parameter will be
used to enable cache and memory bandwidth allocation and monitoring
features on AMD processors. This will enable common config parameter
RESCTRL if selected.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/Kconfig | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 91a703ebdc04..5cef55935a5a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -458,9 +458,24 @@ config INTEL_RDT
 
 	  Say N if unsure.
 
+config AMD_QOS
+	bool "AMD Quality of Service support"
+	default n
+	depends on X86 && CPU_SUP_AMD
+	select KERNFS
+	help
+	  Select to enable cache and memory bandwidth enforcement and monitoring
+	  features of AMD processors. These features are intended to provide
+	  support for the monitoring of the usage of certain system resources
+	  by one or more processors and for the separate allocation and
+	  enforcement of limits on the use of certain system resources by one or
+	  more processors.
+
+	  Say N if unsure.
+
 config RESCTRL
 	def_bool y
-	depends on X86 && INTEL_RDT
+	depends on X86 && (INTEL_RDT || AMD_QOS)
 
 if X86_32
 config X86_BIGSMP
-- 
2.17.1

Re: [PATCH v3 09/11] arch/x86: Introduce new config parameter AMD_QOS

[Borislav Petkov]

On Thu, Oct 11, 2018 at 08:33:35PM +0000, Moger, Babu wrote:
> Introduces the new config parameter AMD_QOS. This parameter will be
> used to enable cache and memory bandwidth allocation and monitoring
> features on AMD processors. This will enable common config parameter
> RESCTRL if selected.
> 
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> ---
>  arch/x86/Kconfig | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 91a703ebdc04..5cef55935a5a 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -458,9 +458,24 @@ config INTEL_RDT
>  
>  	  Say N if unsure.
>  
> +config AMD_QOS
> +	bool "AMD Quality of Service support"
> +	default n
> +	depends on X86 && CPU_SUP_AMD

Why the X86 dependency too? CPU_SUP_AMD is x86-specific and indirectly
implies X86, I'd say.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)

Re: [PATCH v3 09/11] arch/x86: Introduce new config parameter AMD_QOS

[Moger, Babu]

Boris,

On 10/11/2018 05:02 PM, Borislav Petkov wrote:
> On Thu, Oct 11, 2018 at 08:33:35PM +0000, Moger, Babu wrote:
>> Introduces the new config parameter AMD_QOS. This parameter will be
>> used to enable cache and memory bandwidth allocation and monitoring
>> features on AMD processors. This will enable common config parameter
>> RESCTRL if selected.
>>
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> ---
>>  arch/x86/Kconfig | 17 ++++++++++++++++-
>>  1 file changed, 16 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 91a703ebdc04..5cef55935a5a 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -458,9 +458,24 @@ config INTEL_RDT
>>  
>>  	  Say N if unsure.
>>  
>> +config AMD_QOS
>> +	bool "AMD Quality of Service support"
>> +	default n
>> +	depends on X86 && CPU_SUP_AMD
> 
> Why the X86 dependency too? CPU_SUP_AMD is x86-specific and indirectly
> implies X86, I'd say.

That is correct. CPU_SUP_AMD implicitly means x86.
To be more specific, I will change it to
"depends on X86_64 && CPU_SUP_AMD" as this feature is for X86_64 only.
Thanks

Re: [PATCH v3 09/11] arch/x86: Introduce new config parameter AMD_QOS

[Borislav Petkov]

On Fri, Oct 12, 2018 at 02:40:50PM +0000, Moger, Babu wrote:
> That is correct. CPU_SUP_AMD implicitly means x86.
> To be more specific, I will change it to
> "depends on X86_64 && CPU_SUP_AMD" as this feature is for X86_64 only.

No, what I'm saying is, make it dependent *only* on CPU_SUP_AMD.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)

Re: [PATCH v3 09/11] arch/x86: Introduce new config parameter AMD_QOS

[Moger, Babu]

On 10/12/2018 09:43 AM, Borislav Petkov wrote:
> On Fri, Oct 12, 2018 at 02:40:50PM +0000, Moger, Babu wrote:
>> That is correct. CPU_SUP_AMD implicitly means x86.
>> To be more specific, I will change it to
>> "depends on X86_64 && CPU_SUP_AMD" as this feature is for X86_64 only.
> 
> No, what I'm saying is, make it dependent *only* on CPU_SUP_AMD.

Sure. Will do in next revision. Thanks

[PATCH v3 10/11] arch/x86: Add AMD feature bit X86_FEATURE_MBA in cpuid bits array

[Moger, Babu]

From: Sherry Hurwitz <sherry.hurwitz@amd.com>

The feature bit X86_FEATURE_MBA is detected via CPUID leaf 0x80000008
EBX Bit 06. This bit indicates the support of AMD's MBA feature.

This feature is supported by both Intel and AMD. But they are detected
different CPUID leaves.

Signed-off-by: Sherry Hurwitz <sherry.hurwitz@amd.com>
Signed-off-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/scattered.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index 772c219b6889..bd7853334b27 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -17,7 +17,11 @@ struct cpuid_bit {
 	u32 sub_leaf;
 };
 
-/* Please keep the leaf sorted by cpuid_bit.level for faster search. */
+/*
+ * Please keep the leaf sorted by cpuid_bit.level for faster search.
+ * X86_FEATURE_MBA supported by both Intel and AMD. But the cpuid
+ * levels are different. Add a separate enty for each.
+ */
 static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_APERFMPERF,       CPUID_ECX,  0, 0x00000006, 0 },
 	{ X86_FEATURE_EPB,		CPUID_ECX,  3, 0x00000006, 0 },
@@ -29,6 +33,7 @@ static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_HW_PSTATE,	CPUID_EDX,  7, 0x80000007, 0 },
 	{ X86_FEATURE_CPB,		CPUID_EDX,  9, 0x80000007, 0 },
 	{ X86_FEATURE_PROC_FEEDBACK,    CPUID_EDX, 11, 0x80000007, 0 },
+	{ X86_FEATURE_MBA,		CPUID_EBX,  6, 0x80000008, 0 },
 	{ X86_FEATURE_SME,		CPUID_EAX,  0, 0x8000001f, 0 },
 	{ X86_FEATURE_SEV,		CPUID_EAX,  1, 0x8000001f, 0 },
 	{ 0, 0, 0, 0, 0 }
-- 
2.17.1

[PATCH v3 11/11] arch/x86: Introduce QOS feature for AMD

[Moger, Babu]

Enables QOS feature on AMD.
Following QoS sub-features are supported in AMD if the underlying
hardware supports it.
 - L3 Cache allocation enforcement
 - L3 Cache occupancy monitoring
 - L3 Code-Data Prioritization support
 - Memory Bandwidth Enforcement(Allocation)

The specification for this feature is available at
https://developer.amd.com/wp-content/resources/56375.pdf

There are differences in the way some of the features are implemented.
Separate those functions and add those as vendor specific functions.
The major difference is in MBA feature.
 - AMD uses CPUID leaf 0x80000020 to initialize the MBA features.
 - AMD uses direct bandwidth value instead of delay based on bandwidth
   values.
 - MSR register base addresses are different for MBA.
 - Also AMD allows non-contiguous L3 cache bit masks.

Adds following functions to take care of the differences.
rdt_get_mem_config_amd : MBA initialization function
parse_bw_amd : Bandwidth parsing
mba_wrmsr_amd: Writes bandwidth value
cbm_validate_amd : L3 cache bitmask validation

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
 arch/x86/kernel/cpu/resctrl.c             | 69 +++++++++++++++++++++-
 arch/x86/kernel/cpu/resctrl.h             |  5 ++
 arch/x86/kernel/cpu/resctrl_ctrlmondata.c | 70 +++++++++++++++++++++++
 3 files changed, 142 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl.c b/arch/x86/kernel/cpu/resctrl.c
index 9eb5c102c300..b1e31ef52bc0 100644
--- a/arch/x86/kernel/cpu/resctrl.c
+++ b/arch/x86/kernel/cpu/resctrl.c
@@ -61,6 +61,9 @@ mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
 		struct rdt_resource *r);
 static void
 cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);
+static void
+mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m,
+	      struct rdt_resource *r);
 
 #define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].domains)
 
@@ -280,6 +283,31 @@ static bool rdt_get_mem_config(struct rdt_resource *r)
 	return true;
 }
 
+static bool rdt_get_mem_config_amd(struct rdt_resource *r)
+{
+	union cpuid_0x10_3_eax eax;
+	union cpuid_0x10_x_edx edx;
+	u32 ebx, ecx;
+
+	cpuid_count(0x80000020, 1, &eax.full, &ebx, &ecx, &edx.full);
+	r->num_closid = edx.split.cos_max + 1;
+	r->default_ctrl = MAX_MBA_BW_AMD;
+
+	/* AMD does not use delay. Set delay_linear to false by default */
+	r->membw.delay_linear = false;
+
+	/* FIX ME - May need to be read from MSR */
+	r->membw.min_bw = 0;
+	r->membw.bw_gran = 1;
+	/* Max value is 2048, Data width should be 4 in decimal */
+	r->data_width = 4;
+
+	r->alloc_capable = true;
+	r->alloc_enabled = true;
+
+	return true;
+}
+
 static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
 {
 	union cpuid_0x10_1_eax eax;
@@ -339,6 +367,16 @@ static int get_cache_id(int cpu, int level)
 	return -1;
 }
 
+static void
+mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
+{
+	unsigned int i;
+
+	/*  Write the bw values for mba. */
+	for (i = m->low; i < m->high; i++)
+		wrmsrl(r->msr_base + i, d->ctrl_val[i]);
+}
+
 /*
  * Map the memory b/w percentage value to delay values
  * that can be written to QOS_MSRs.
@@ -786,8 +824,13 @@ static bool __init rdt_cpu_has(int flag)
 static __init bool rdt_mba_config(void)
 {
 	if (rdt_cpu_has(X86_FEATURE_MBA)) {
-		if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
-			return true;
+		if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
+			if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
+				return true;
+		} else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
+			if (rdt_get_mem_config_amd(&rdt_resources_all[RDT_RESOURCE_MBA]))
+				return true;
+		}
 	}
 
 	return false;
@@ -888,10 +931,32 @@ static __init void rdt_init_res_defs_intel(void)
 	}
 }
 
+static __init void rdt_init_res_defs_amd(void)
+{
+	struct rdt_resource *r;
+
+	for_each_rdt_resource(r) {
+		if ((r->rid == RDT_RESOURCE_L3) ||
+		    (r->rid == RDT_RESOURCE_L3DATA) ||
+		    (r->rid == RDT_RESOURCE_L3CODE) ||
+		    (r->rid == RDT_RESOURCE_L2) ||
+		    (r->rid == RDT_RESOURCE_L2DATA) ||
+		    (r->rid == RDT_RESOURCE_L2CODE))
+			r->cbm_validate = cbm_validate_amd;
+		else if (r->rid == RDT_RESOURCE_MBA) {
+			r->msr_base = IA32_MBA_BW_BASE;
+			r->msr_update = mba_wrmsr_amd;
+			r->parse_ctrlval = parse_bw_amd;
+		}
+	}
+}
+
 static __init void rdt_init_res_defs(void)
 {
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		rdt_init_res_defs_intel();
+	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+		rdt_init_res_defs_amd();
 }
 
 static enum cpuhp_state rdt_online;
diff --git a/arch/x86/kernel/cpu/resctrl.h b/arch/x86/kernel/cpu/resctrl.h
index 825d5571539e..3b8b5ade77ab 100644
--- a/arch/x86/kernel/cpu/resctrl.h
+++ b/arch/x86/kernel/cpu/resctrl.h
@@ -11,6 +11,7 @@
 #define IA32_L3_CBM_BASE	0xc90
 #define IA32_L2_CBM_BASE	0xd10
 #define IA32_MBA_THRTL_BASE	0xd50
+#define IA32_MBA_BW_BASE	0xc0000200
 
 #define IA32_QM_CTR		0x0c8e
 #define IA32_QM_EVTSEL		0x0c8d
@@ -34,6 +35,7 @@
 #define MAX_MBA_BW			100u
 #define MBA_IS_LINEAR			0x4
 #define MBA_MAX_MBPS			U32_MAX
+#define MAX_MBA_BW_AMD			0x800
 
 #define RMID_VAL_ERROR			BIT_ULL(63)
 #define RMID_VAL_UNAVAIL		BIT_ULL(62)
@@ -451,6 +453,8 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 	      struct rdt_domain *d);
 int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
 		   struct rdt_domain *d);
+int parse_bw_amd(struct rdt_parse_data *data, struct rdt_resource *r,
+		 struct rdt_domain *d);
 
 extern struct mutex rdtgroup_mutex;
 
@@ -583,5 +587,6 @@ bool has_busy_rmid(struct rdt_resource *r, struct rdt_domain *d);
 void __check_limbo(struct rdt_domain *d, bool force_free);
 void update_mba_bw_intel(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm);
 bool cbm_validate_intel(char *buf, u32 *data, struct rdt_resource *r);
+bool cbm_validate_amd(char *buf, u32 *data, struct rdt_resource *r);
 
 #endif /* _ASM_X86_RESCTRL_H */
diff --git a/arch/x86/kernel/cpu/resctrl_ctrlmondata.c b/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
index 867da06223b5..e071f2c6e36e 100644
--- a/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl_ctrlmondata.c
@@ -28,6 +28,52 @@
 #include <linux/slab.h>
 #include "resctrl.h"
 
+/*
+ * Check whether MBA bandwidth percentage value is correct. The value is
+ * checked against the minimum and max bandwidth values specified by the
+ * hardware. The allocated bandwidth percentage is rounded to the next
+ * control step available on the hardware.
+ */
+static bool bw_validate_amd(char *buf, unsigned long *data,
+			    struct rdt_resource *r)
+{
+	unsigned long bw;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &bw);
+	if (ret) {
+		rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
+		return false;
+	}
+
+	if (bw < r->membw.min_bw || bw > r->default_ctrl) {
+		rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
+				    r->membw.min_bw, r->default_ctrl);
+		return false;
+	}
+
+	*data = roundup(bw, (unsigned long)r->membw.bw_gran);
+	return true;
+}
+
+int parse_bw_amd(struct rdt_parse_data *data, struct rdt_resource *r,
+	     struct rdt_domain *d)
+{
+	unsigned long bw_val;
+
+	if (d->have_new_ctrl) {
+		rdt_last_cmd_printf("duplicate domain %d\n", d->id);
+		return -EINVAL;
+	}
+
+	if (!bw_validate_amd(data->buf, &bw_val, r))
+		return -EINVAL;
+	d->new_ctrl = bw_val;
+	d->have_new_ctrl = true;
+
+	return 0;
+}
+
 /*
  * Check whether MBA bandwidth percentage value is correct. The value is
  * checked against the minimum and max bandwidth values specified by the
@@ -123,6 +169,30 @@ bool cbm_validate_intel(char *buf, u32 *data, struct rdt_resource *r)
 	return true;
 }
 
+/*
+ * Check whether a cache bit mask is valid. AMD allows non-contiguous
+ * bitmasks
+ */
+bool cbm_validate_amd(char *buf, u32 *data, struct rdt_resource *r)
+{
+	unsigned long val;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &val);
+	if (ret) {
+		rdt_last_cmd_printf("non-hex character in mask %s\n", buf);
+		return false;
+	}
+
+	if (val > r->default_ctrl) {
+		rdt_last_cmd_puts("mask out of range\n");
+		return false;
+	}
+
+	*data = val;
+	return true;
+}
+
 /*
  * Read one cache bit mask (hex). Check that it is valid for the current
  * resource type.
-- 
2.17.1