linux-kernel - [PATCH 6.6.y 0/4] perf/x86/amd: add LBR capture support outside of hardware events

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Message-ID: <20260102090320.32843-1-leon.hwang@linux.dev>
Date: Fri,  2 Jan 2026 17:03:16 +0800
From: Leon Hwang <leon.hwang@...ux.dev>
To: stable@...r.kernel.org,
	greg@...ah.com
Cc: Andrii Nakryiko <andrii@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Leon Hwang <leon.hwang@...ux.dev>
Subject: [PATCH 6.6.y 0/4] perf/x86/amd: add LBR capture support outside of hardware events

Hi all,

This backport wires up AMD perfmon v2 so BPF and other software clients
can snapshot LBR stacks on demand, similar to the Intel support
upstream. The series keeps the LBR-freeze path branchless, adds the
perf_snapshot_branch_stack callback for AMD, and drops the
sampling-only restriction now that snapshots can be taken from software
contexts.

Leon Hwang (4):
  perf/x86/amd: Ensure amd_pmu_core_disable_all() is always inlined
  perf/x86/amd: Avoid taking branches before disabling LBR
  perf/x86/amd: Support capturing LBR from software events
  perf/x86/amd: Don't reject non-sampling events with configured LBR

 arch/x86/events/amd/core.c   | 37 +++++++++++++++++++++++++++++++++++-
 arch/x86/events/amd/lbr.c    | 13 +------------
 arch/x86/events/perf_event.h | 13 +++++++++++++
 3 files changed, 50 insertions(+), 13 deletions(-)

--
2.52.0