linux-kernel - [PATCH v3 00/10] x86/resctrl: Support for AMD QoS new features and bug fix

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Message-ID: <166117559756.6695.16047463526634290701.stgit@bmoger-ubuntu>
Date:   Mon, 22 Aug 2022 08:42:37 -0500
From:   Babu Moger <babu.moger@....com>
To:     <fenghua.yu@...el.com>, <reinette.chatre@...el.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC:     <eranian@...gle.com>, <dave.hansen@...ux.intel.com>,
        <x86@...nel.org>, <hpa@...or.com>, <corbet@....net>,
        <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <bagasdotme@...il.com>
Subject: [PATCH v3 00/10] x86/resctrl: Support for AMD QoS new features and
 bug fix

New AMD processors can now support following QoS features.
1. Slow Memory Bandwidth Conﬁguration
   With this feature, the QOS enforcement policies can be applied
   to the external slow memory connected to the host. QOS enforcement
   is accomplished by assigning a Class Of Service (COS) to a processor
   and specifying allocations or limits for that COS for each resource
   to be allocated.

2. Bandwidth Monitoring Event Configuration (BMEC)
   The bandwidth monitoring events mbm_total_event and mbm_local_event 
   are set to count all the total and local reads/writes respectively.
   With the introduction of slow memory, the two counters are not enough
   to count all the different types are memory events. With the feature
   BMEC, the users have the option to configure mbm_total_event and
   mbm_local_event to count the specific type of events.

   Following are the bitmaps of events supported.
   Bits    Description
      6       Dirty Victims from the QOS domain to all types of memory
      5       Reads to slow memory in the non-local NUMA domain
      4       Reads to slow memory in the local NUMA domain
      3       Non-temporal writes to non-local NUMA domain
      2       Non-temporal writes to local NUMA domain
      1       Reads to memory in the non-local NUMA domain
      0       Reads to memory in the local NUMA domain

This series adds support for these features.

Feature description is available in the specification, "AMD64 Technology Platform Quality
of Service Extensions, Revision: 1.03 Publication # 56375 Revision: 1.03 Issue Date: February 2022".

Link: https://www.amd.com/en/support/tech-docs/amd64-technology-platform-quality-service-extensions
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537
---

v3:
  a. Rebased the patches to latest tip. Resolved some conflicts.
     https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
  b. Taken care of feedback from Bagas Sanjaya.
  c. Added Reviewed by from Mingo.
  Note: I am still looking for comments from Reinette or Fenghua.

v2:
  a. Rebased the patches to latest stable tree (v5.18.15). Resolved some conflicts.
  b. Added the patch to fix CBM issue on AMD. This was originally discussed
     https://lore.kernel.org/lkml/20220517001234.3137157-1-eranian@google.com/
  https://lore.kernel.org/lkml/165938717220.724959.10931629283087443782.stgit@bmoger-ubuntu/

v1:
  https://lore.kernel.org/lkml/165757543252.416408.13547339307237713464.stgit@bmoger-ubuntu/

Babu Moger (10):
      x86/resctrl: Fix min_cbm_bits for AMD
      x86/cpufeatures: Add Slow Memory Bandwidth Allocation feature flag
      x86/resctrl: Add a new resource type RDT_RESOURCE_SMBA
      x86/resctrl: Detect and configure Slow Memory Bandwidth allocation
      x86/cpufeatures: Add Bandwidth Monitoring Event Configuration feature flag
      x86/resctrl: Introduce mon_configurable to detect Bandwidth Monitoring Event Configuration
      x86/resctrl: Add sysfs interface files to read/write event configuration
      x86/resctrl: Add the sysfs interface to read the event configuration
      x86/resctrl: Add sysfs interface to write the event configuration
      Documentation/x86: Update resctrl_ui.rst for new features


 Documentation/x86/resctrl.rst             | 126 ++++++++++++
 arch/x86/include/asm/cpufeatures.h        |   2 +
 arch/x86/kernel/cpu/resctrl/core.c        |  70 ++++++-
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |   2 +-
 arch/x86/kernel/cpu/resctrl/internal.h    |  26 +++
 arch/x86/kernel/cpu/resctrl/monitor.c     |  16 ++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 237 +++++++++++++++++++++-
 arch/x86/kernel/cpu/scattered.c           |   2 +
 include/linux/resctrl.h                   |   1 +
 9 files changed, 472 insertions(+), 10 deletions(-)

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