linux-kernel - [PATCH v4 0/3] Add support for a DRM tool like PMU

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Message-ID: <20250624231837.179536-1-irogers@google.com>
Date: Tue, 24 Jun 2025 16:18:34 -0700
From: Ian Rogers <irogers@...gle.com>
To: 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>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, James Clark <james.clark@...aro.org>, 
	Weilin Wang <weilin.wang@...el.com>, Dominique Martinet <asmadeus@...ewreck.org>, 
	Thomas Richter <tmricht@...ux.ibm.com>, Junhao He <hejunhao3@...wei.com>, 
	Jean-Philippe Romain <jean-philippe.romain@...s.st.com>, matthew.olson@...el.com, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org
Cc: Ian Rogers <irogers@...gle.com>
Subject: [PATCH v4 0/3] Add support for a DRM tool like PMU

DRM clients expose information through usage stats as documented in
Documentation/gpu/drm-usage-stats.rst (available online at
https://docs.kernel.org/gpu/drm-usage-stats.html). Add a tool like
PMU, similar to the hwmon PMU, that exposes DRM information.

v4: Rebase over changes like the auto merge stat to first wildcard PMU
    change and the clean up of tool PMU initialization.

v3: Minor tweak to the test so the skip (exit 2) doesn't trigger the
    trap cleanup.

v2: Add support to only scan hwmon and drm PMUs if the event or PMU
    wildcard can match. Add a test as requested by Namhyung. Add file
    comments.

v1:
https://lore.kernel.org/lkml/20250211071727.364389-1-irogers@google.com/

Ian Rogers (3):
  perf parse-events: Avoid scanning PMUs that can't contain events
  perf drm_pmu: Add a tool like PMU to expose DRM information
  perf tests: Add a DRM PMU test

 tools/perf/tests/shell/drm_pmu.sh |  78 ++++
 tools/perf/util/Build             |   1 +
 tools/perf/util/drm_pmu.c         | 686 ++++++++++++++++++++++++++++++
 tools/perf/util/drm_pmu.h         |  39 ++
 tools/perf/util/evsel.c           |   9 +
 tools/perf/util/parse-events.c    |  33 +-
 tools/perf/util/pmu.c             |  15 +
 tools/perf/util/pmu.h             |   4 +-
 tools/perf/util/pmus.c            | 101 ++++-
 tools/perf/util/pmus.h            |   2 +
 10 files changed, 951 insertions(+), 17 deletions(-)
 create mode 100755 tools/perf/tests/shell/drm_pmu.sh
 create mode 100644 tools/perf/util/drm_pmu.c
 create mode 100644 tools/perf/util/drm_pmu.h

-- 
2.50.0.727.gbf7dc18ff4-goog