[Patch v5 00/10] arch-PEBS enabling for Intel platforms

[Dapeng Mi]

This patchset introduces architectural PEBS support for Intel platforms
like Clearwater Forest (CWF) and Panther Lake (PTL). The detailed
information about arch-PEBS can be found in chapter 11
"architectural PEBS" of "Intel Architecture Instruction Set Extensions
and Future Features".

This patch set doesn't include the SSP and SIMD regs (OPMASK/YMM/ZMM)
sampling support for arch-PEBS to avoid the dependency for the basic
SIMD regs sampling support patch series[1]. Once the basic SIMD regs
sampling is supported, the arch-PEBS based SSP and SIMD regs
(OPMASK/YMM/ZMM) sampling would be supported in a later patch set.

Changes:
  v4 -> v5:
  * Rebase code to 6.16-rc3
  * Allocate/free arch-PEBS buffer in callbacks *prepare_cpu/*dead_cpu
    (patch 07/10, Peter)
  * Code and comments refine (patch 09/10, Peter)

Tests:
  Run below tests on Clearwater Forest and Pantherlake, no issue is
  found.

  1. Basic perf counting case.
    perf stat -e '{branches,branches,branches,branches,branches,branches,branches,branches,cycles,instructions,ref-cycles}' sleep 1

  2. Basic PMI based perf sampling case.
    perf record -e '{branches,branches,branches,branches,branches,branches,branches,branches,cycles,instructions,ref-cycles}' sleep 1

  3. Basic PEBS based perf sampling case.
    perf record -e '{branches,branches,branches,branches,branches,branches,branches,branches,cycles,instructions,ref-cycles}:p' sleep 1

  4. PEBS sampling case with basic, GPRs, vector-registers and LBR groups
    perf record -e branches:p -Iax,bx,ip,xmm0 -b -c 10000 sleep 1

  5. User space PEBS sampling case with basic, GPRs and LBR groups
    perf record -e branches:p --user-regs=ax,bx,ip -b -c 10000 sleep 1

  6 PEBS sampling case with auxiliary (memory info) group
    perf mem record sleep 1

  7. PEBS sampling case with counter group
    perf record -e '{branches:p,branches,cycles}:S' -c 10000 sleep 1

  8. Perf stat and record test
    perf test 96; perf test 125


History:
  v4: https://lore.kernel.org/all/20250620103909.1586595-1-dapeng1.mi@xxxxxxxxxxxxxxx/
  v3: https://lore.kernel.org/all/20250415114428.341182-1-dapeng1.mi@xxxxxxxxxxxxxxx/
  v2: https://lore.kernel.org/all/20250218152818.158614-1-dapeng1.mi@xxxxxxxxxxxxxxx/
  v1: https://lore.kernel.org/all/20250123140721.2496639-1-dapeng1.mi@xxxxxxxxxxxxxxx/

Ref:
  [1]: https://lore.kernel.org/all/20250613134943.3186517-1-kan.liang@xxxxxxxxxxxxxxx/

Dapeng Mi (10):
  perf/x86/intel: Replace x86_pmu.drain_pebs calling with static call
  perf/x86/intel: Correct large PEBS flag check
  perf/x86/intel: Initialize architectural PEBS
  perf/x86/intel/ds: Factor out PEBS record processing code to functions
  perf/x86/intel/ds: Factor out PEBS group processing code to functions
  perf/x86/intel: Process arch-PEBS records or record fragments
  perf/x86/intel: Allocate arch-PEBS buffer and initialize PEBS_BASE MSR
  perf/x86/intel: Update dyn_constranit base on PEBS event precise level
  perf/x86/intel: Setup PEBS data configuration and enable legacy groups
  perf/x86/intel: Add counter group support for arch-PEBS

 arch/x86/events/core.c            |  21 +-
 arch/x86/events/intel/core.c      | 268 +++++++++++++-
 arch/x86/events/intel/ds.c        | 595 ++++++++++++++++++++++++------
 arch/x86/events/perf_event.h      |  40 +-
 arch/x86/include/asm/intel_ds.h   |  10 +-
 arch/x86/include/asm/msr-index.h  |  20 +
 arch/x86/include/asm/perf_event.h | 116 +++++-
 7 files changed, 930 insertions(+), 140 deletions(-)


base-commit: 86731a2a651e58953fc949573895f2fa6d456841
-- 
2.43.0