linux-kernel - [PATCH v5 0/2] perf/x86/amd: Fix for LBR Freeze

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Date: Mon, 25 Mar 2024 13:01:43 +0530
From: Sandipan Das <sandipan.das@....com>
To: <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <x86@...nel.org>, <peterz@...radead.org>, <mingo@...nel.org>,
	<acme@...nel.org>, <namhyung@...nel.org>, <mark.rutland@....com>,
	<alexander.shishkin@...ux.intel.com>, <jolsa@...nel.org>,
	<adrian.hunter@...el.com>, <tglx@...utronix.de>, <bp@...en8.de>,
	<seanjc@...gle.com>, <pbonzini@...hat.com>, <eranian@...gle.com>,
	<irogers@...gle.com>, <ravi.bangoria@....com>, <ananth.narayan@....com>,
	<sandipan.das@....com>
Subject: [PATCH v5 0/2] perf/x86/amd: Fix for LBR Freeze

Contains a fix for usage of LBR Freeze.

Previous versions can be found at:
v4: https://lore.kernel.org/all/cover.1710836172.git.sandipan.das@amd.com/
v3: https://lore.kernel.org/all/cover.1706526029.git.sandipan.das@amd.com/
v2: https://lore.kernel.org/all/cover.1704103399.git.sandipan.das@amd.com/
v1: https://lore.kernel.org/all/cover.1702833179.git.sandipan.das@amd.com/

Changes in v5:
 - Restore previously moved scattered bits and instead create a new
   Linux-defined feature word for new scattered bits as suggested by
   Boris and Ingo.

Changes in v4:
 - Move scattered feature bits from CPUID 0x80000022[EAX] to a dedicated
   word as suggested by Ingo.
 - Remove patches that have been merged (patch 2 and 3 from v3).

Changes in v3:
 - As suggested by Boris, update the commit message of the first patch
   with the reason behind making the LBR and PMC Freeze feature bit
   visible in /proc/cpuinfo.

Changes in v2:
 - Make the LBR and PMC Freeze feature bit visible in /proc/cpuinfo. As
   suggested by Stephane, this will be useful to determine if it is
   feasible to perform kernel FDO on a system.

Sandipan Das (2):
  x86/cpufeatures: Add new word for scattered features
  perf/x86/amd/lbr: Use freeze based on availability

 arch/x86/events/amd/core.c               |  4 ++--
 arch/x86/events/amd/lbr.c                | 16 ++++++++++------
 arch/x86/include/asm/cpufeature.h        |  6 ++++--
 arch/x86/include/asm/cpufeatures.h       | 10 +++++++++-
 arch/x86/include/asm/disabled-features.h |  3 ++-
 arch/x86/include/asm/required-features.h |  3 ++-
 arch/x86/kernel/cpu/scattered.c          |  1 +
 7 files changed, 30 insertions(+), 13 deletions(-)

-- 
2.34.1