[PATCH v1 0/3] perf pmu: Add tool-provided NVMe PMU

[Ian Rogers]

This patch series introduces a tool-provided PMU for NVMe devices to expose
various hardware logs as perf events.

Using libnvme, the new nvme_pmu extracts metrics from standard NVMe log pages
including:
- SMART / Health Information (e.g. data units read/written, power cycles,
  temperature)
- Endurance Group Information
- FDP (Flexible Data Placement) Statistics
- Error Information
- Zoned Namespaces (ZNS) Changed Zones

Key features:
- Dynamic probing of supported log pages on /dev/nvmeX. Unsupported events
  are marked as deprecated and hidden from `perf list` by default.
- Generic configuration encoding where the log type, size, and offset are
  encoded directly into the event configuration.
- Correct interval delta tracking using baseline offset snapshots. This mimics
  the behavior of the hwmon PMU, allowing gauges like Temperature to be
  reported instantaneously in `perf stat -I`, while standard counters
  correctly accumulate deltas.
- Robust handling of cross-architecture endianness when reading 128-bit and
  64-bit fields from the NVMe specification.

The series is broken down into:
1. Adding the libnvme feature detection via pkg-config in tools/build.
2. The core implementation of the NVMe tool PMU.
3. A unit test suite verifying the parsing and encoding of the NVMe PMU
   events using a mocked device.

Ian Rogers (3):
  perf build: Add libnvme feature detection
  perf pmu: Implement tool-provided NVMe PMU
  perf tests: Add NVMe PMU event parsing test

 tools/build/Makefile.feature       |   2 +
 tools/build/feature/Makefile       |   3 +
 tools/build/feature/test-libnvme.c |  11 +
 tools/perf/Makefile.config         |  12 +
 tools/perf/tests/Build             |   1 +
 tools/perf/tests/builtin-test.c    |   1 +
 tools/perf/tests/nvme_pmu.c        | 176 ++++++++++
 tools/perf/tests/tests.h           |   1 +
 tools/perf/util/Build              |   1 +
 tools/perf/util/evsel.c            |  11 +-
 tools/perf/util/nvme_pmu.c         | 535 +++++++++++++++++++++++++++++
 tools/perf/util/nvme_pmu.h         | 143 ++++++++
 tools/perf/util/pmu.c              |  15 +
 tools/perf/util/pmu.h              |   8 +-
 tools/perf/util/pmus.c             |  31 +-
 tools/perf/util/pmus.h             |   1 +
 16 files changed, 945 insertions(+), 7 deletions(-)
 create mode 100644 tools/build/feature/test-libnvme.c
 create mode 100644 tools/perf/tests/nvme_pmu.c
 create mode 100644 tools/perf/util/nvme_pmu.c
 create mode 100644 tools/perf/util/nvme_pmu.h

-- 
2.54.0.1064.gd145956f57-goog