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Subject: [PATCH v7 00/12] x86/resctrl: Support for AMD QoS new features
From:   Babu Moger <babu.moger@amd.com>
To:     <corbet@lwn.net>, <reinette.chatre@intel.com>,
        <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>
CC:     <fenghua.yu@intel.com>, <dave.hansen@linux.intel.com>,
        <x86@kernel.org>, <hpa@zytor.com>, <paulmck@kernel.org>,
        <akpm@linux-foundation.org>, <quic_neeraju@quicinc.com>,
        <rdunlap@infradead.org>, <damien.lemoal@opensource.wdc.com>,
        <songmuchun@bytedance.com>, <peterz@infradead.org>,
        <jpoimboe@kernel.org>, <pbonzini@redhat.com>, <babu.moger@amd.com>,
        <chang.seok.bae@intel.com>, <pawan.kumar.gupta@linux.intel.com>,
        <jmattson@google.com>, <daniel.sneddon@linux.intel.com>,
        <sandipan.das@amd.com>, <tony.luck@intel.com>,
        <james.morse@arm.com>, <linux-doc@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <bagasdotme@gmail.com>,
        <eranian@google.com>
Date:   Mon, 17 Oct 2022 17:25:58 -0500
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New AMD processors can now support following QoS features.=0A=
=0A=
1. Slow Memory Bandwidth Allocation (SMBA)=0A=
   With this feature, the QOS enforcement policies can be applied=0A=
   to the external slow memory connected to the host. QOS enforcement=0A=
   is accomplished by assigning a Class Of Service (COS) to a processor=0A=
   and specifying allocations or limits for that COS for each resource=0A=
   to be allocated.=0A=
=0A=
   Currently, CXL.memory is the only supported "slow" memory device. With=
=0A=
   the support of SMBA feature the hardware enables bandwidth allocation=0A=
   on the slow memory devices.=0A=
=0A=
2. Bandwidth Monitoring Event Configuration (BMEC)=0A=
   The bandwidth monitoring events mbm_total_event and mbm_local_event =0A=
   are set to count all the total and local reads/writes respectively.=0A=
   With the introduction of slow memory, the two counters are not enough=0A=
   to count all the different types are memory events. With the feature=0A=
   BMEC, the users have the option to configure mbm_total_event and=0A=
   mbm_local_event to count the specific type of events.=0A=
=0A=
   Following are the bitmaps of events supported.=0A=
   Bits    Description=0A=
     6       Dirty Victims from the QOS domain to all types of memory=0A=
     5       Reads to slow memory in the non-local NUMA domain=0A=
     4       Reads to slow memory in the local NUMA domain=0A=
     3       Non-temporal writes to non-local NUMA domain=0A=
     2       Non-temporal writes to local NUMA domain=0A=
     1       Reads to memory in the non-local NUMA domain=0A=
     0       Reads to memory in the local NUMA domain=0A=
=0A=
This series adds support for these features.=0A=
=0A=
Feature description is available in the specification, "AMD64 Technology Pl=
atform Quality of Service Extensions, Revision: 1.03 Publication # 56375=0A=
Revision: 1.03 Issue Date: February 2022".=0A=
=0A=
Link: https://www.amd.com/en/support/tech-docs/amd64-technology-platform-qu=
ality-service-extensions=0A=
Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D206537=0A=
---=0A=
v7:=0A=
 Changes:=0A=
 Not much of a change. Missed one comment from Reinette from v5. Corrected =
it now.=0A=
 Few format corrections from Sanjaya.=0A=
=0A=
v6:=0A=
 https://lore.kernel.org/lkml/166543345606.23830.3120625408601531368.stgit@=
bmoger-ubuntu/=0A=
 Summary of changes:=0A=
 1. Rebased on top of lastest tip tree. Fixed few minor conflicts.=0A=
 2. Fixed format issue with scattered.c.=0A=
 3. Removed config_name from the structure mon_evt. It is not required.=0A=
 4. The read/write format for mbm_total_config and mbm_local_config will be=
 same=0A=
    as schemata format "id0=3Dval0;id1=3Dval1;...". This is comment from Fe=
nghua.=0A=
 5. Added more comments MSR_IA32_EVT_CFG_BASE writng.=0A=
 5. Few text changes in resctrl.rst =0A=
 =0A=
v5:=0A=
  https://lore.kernel.org/lkml/166431016617.373387.1968875281081252467.stgi=
t@bmoger-ubuntu/=0A=
  Summary of changes.=0A=
  1. Split the series into two. The first two patches are bug fixes. So, se=
nt them separate.=0A=
  2. The config files mbm_total_config and mbm_local_config are now under=
=0A=
     /sys/fs/resctrl/info/L3_MON/. Removed these config files from mon grou=
ps.=0A=
  3. Ran "checkpatch --strict --codespell" on all the patches. Looks good w=
ith few known exceptions.=0A=
  4. Few minor text changes in resctrl.rst file. =0A=
=0A=
v4:=0A=
  https://lore.kernel.org/lkml/166257348081.1043018.11227924488792315932.st=
git@bmoger-ubuntu/=0A=
  Got numerios of comments from Reinette Chatre. Addressed most of them. =
=0A=
  Summary of changes.=0A=
  1. Removed mon_configurable under /sys/fs/resctrl/info/L3_MON/.  =0A=
  2. Updated mon_features texts if the BMEC is supported.=0A=
  3. Added more explanation about the slow memory support.=0A=
  4. Replaced smp_call_function_many with on_each_cpu_mask call.=0A=
  5. Removed arch_has_empty_bitmaps=0A=
  6. Few other text changes.=0A=
  7. Removed Reviewed-by if the patch is modified.=0A=
  8. Rebased the patches to latest tip.=0A=
=0A=
v3:=0A=
  https://lore.kernel.org/lkml/166117559756.6695.16047463526634290701.stgit=
@bmoger-ubuntu/=0A=
  a. Rebased the patches to latest tip. Resolved some conflicts.=0A=
     https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git=0A=
  b. Taken care of feedback from Bagas Sanjaya.=0A=
  c. Added Reviewed by from Mingo.=0A=
  Note: I am still looking for comments from Reinette or Fenghua.=0A=
=0A=
v2:=0A=
  https://lore.kernel.org/lkml/165938717220.724959.10931629283087443782.stg=
it@bmoger-ubuntu/=0A=
  a. Rebased the patches to latest stable tree (v5.18.15). Resolved some co=
nflicts.=0A=
  b. Added the patch to fix CBM issue on AMD. This was originally discussed=
=0A=
     https://lore.kernel.org/lkml/20220517001234.3137157-1-eranian@google.c=
om/=0A=
=0A=
v1:=0A=
  https://lore.kernel.org/lkml/165757543252.416408.13547339307237713464.stg=
it@bmoger-ubuntu/=0A=
=0A=
Babu Moger (12):=0A=
      x86/cpufeatures: Add Slow Memory Bandwidth Allocation feature flag=0A=
      x86/resctrl: Add a new resource type RDT_RESOURCE_SMBA=0A=
      x86/cpufeatures: Add Bandwidth Monitoring Event Configuration feature=
 flag=0A=
      x86/resctrl: Include new features in command line options=0A=
      x86/resctrl: Detect and configure Slow Memory Bandwidth allocation=0A=
      x86/resctrl: Introduce data structure to support monitor configuratio=
n=0A=
      x86/resctrl: Add sysfs interface to read mbm_total_bytes event config=
uration=0A=
      x86/resctrl: Add sysfs interface to read mbm_local_bytes event config=
uration=0A=
      x86/resctrl: Add sysfs interface to write mbm_total_bytes event confi=
guration=0A=
      x86/resctrl: Add sysfs interface to write mbm_local_bytes event confi=
guration=0A=
      x86/resctrl: Replace smp_call_function_many() with on_each_cpu_mask()=
=0A=
      Documentation/x86: Update resctrl.rst for new features=0A=
=0A=
=0A=
 .../admin-guide/kernel-parameters.txt         |   2 +-=0A=
 Documentation/x86/resctrl.rst                 | 139 +++++++-=0A=
 arch/x86/include/asm/cpufeatures.h            |   2 +=0A=
 arch/x86/kernel/cpu/cpuid-deps.c              |   1 +=0A=
 arch/x86/kernel/cpu/resctrl/core.c            |  51 ++-=0A=
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c     |   2 +-=0A=
 arch/x86/kernel/cpu/resctrl/internal.h        |  31 +-=0A=
 arch/x86/kernel/cpu/resctrl/monitor.c         |   7 +-=0A=
 arch/x86/kernel/cpu/resctrl/rdtgroup.c        | 313 ++++++++++++++++--=0A=
 arch/x86/kernel/cpu/scattered.c               |   2 +=0A=
 10 files changed, 513 insertions(+), 37 deletions(-)=0A=
=0A=
--=0A=