[Intel-gfx] [PATCH v7 0/9] i915 PMU and engine busy stats

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Headline change is removal of the static branch optimisation since I couldn't
prove that it makes a significant difference in the real world. I was able
to meaure a small CPU usage decrease in our lrc tasklet, in one micro-benchmark,
but I did not feel that justified it.

There are also tweaks to engine busyness tracking and the delayed stats disable
got moved to a different patch due to the above.

Patch 1 is a small refactor to make the following work easier.

Patch 2 is the main bit.

Patch 3 is a small optimisation on top, to only run the sampling timer when it
is required. (Depending on GPU awake status and active PMU counters.)

Patches 4-6 add software engine busyness tracking, which is then used from the
PMU. This allows more efficient and more accurate engine busyness metric.

Patches 7-9 add the RC6 and interrupt count metric.

Tvrtko Ursulin (9):
  drm/i915: Extract intel_get_cagf
  drm/i915/pmu: Expose a PMU interface for perf queries
  drm/i915/pmu: Suspend sampling when GPU is idle
  drm/i915: Wrap context schedule notification
  drm/i915: Engine busy time tracking
  drm/i915/pmu: Wire up engine busy stats to PMU
  drm/i915/pmu: Add interrupt count metric
  drm/i915: Convert intel_rc6_residency_us to ns
  drm/i915/pmu: Add RC6 residency metrics

 drivers/gpu/drm/i915/Makefile           |   1 +
 drivers/gpu/drm/i915/i915_debugfs.c     |   9 +-
 drivers/gpu/drm/i915/i915_drv.c         |   2 +
 drivers/gpu/drm/i915/i915_drv.h         |  28 +-
 drivers/gpu/drm/i915/i915_gem.c         |   1 +
 drivers/gpu/drm/i915/i915_gem_request.c |   1 +
 drivers/gpu/drm/i915/i915_pmu.c         | 855 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_pmu.h         | 100 ++++
 drivers/gpu/drm/i915/i915_reg.h         |   3 +
 drivers/gpu/drm/i915/i915_sysfs.c       |  20 +-
 drivers/gpu/drm/i915/intel_engine_cs.c  | 122 +++++
 drivers/gpu/drm/i915/intel_lrc.c        |  19 +-
 drivers/gpu/drm/i915/intel_pm.c         |  41 +-
 drivers/gpu/drm/i915/intel_ringbuffer.h | 132 +++++
 include/uapi/drm/i915_drm.h             |  54 ++
 15 files changed, 1353 insertions(+), 35 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/i915_pmu.c
 create mode 100644 drivers/gpu/drm/i915/i915_pmu.h

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2.9.5