[PATCH v4 00/8] i915 PMU and engine busy stats

[Tvrtko Ursulin <tursulin@ursulin.net>]

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

Fourth spin of the i915 PMU series. Now with the RFC tag removed.

This is a cleaned up and bugfixed version with incorporated inital review
feedback. Some patches have been dropped for time being.

Patches 1-2 are small refactors to make the following work easier.

Patch 3 is the main bit.

Patch 4 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 5-7 add software engine busyness tracking, which is then used from the
PMU in patch 7. This allows more efficient and more accurate engine busyness
metric.

And finally patch 8 is an additional optimisation which hides the whole cost
of the software engine busyness tracking behind a single nop instruction in
the off case.

Tvrtko Ursulin (8):
  drm/i915: Convert intel_rc6_residency_us to ns
  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: Gate engine stats collection with a static key

 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         |  96 +++-
 drivers/gpu/drm/i915/i915_gem.c         |   1 +
 drivers/gpu/drm/i915/i915_gem_request.c |   1 +
 drivers/gpu/drm/i915/i915_pmu.c         | 853 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h         |   3 +
 drivers/gpu/drm/i915/i915_sysfs.c       |  20 +-
 drivers/gpu/drm/i915/intel_engine_cs.c  | 111 +++++
 drivers/gpu/drm/i915/intel_lrc.c        |  19 +-
 drivers/gpu/drm/i915/intel_pm.c         |  41 +-
 drivers/gpu/drm/i915/intel_ringbuffer.c |  25 +
 drivers/gpu/drm/i915/intel_ringbuffer.h | 147 ++++++
 include/uapi/drm/i915_drm.h             |  57 +++
 15 files changed, 1351 insertions(+), 35 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/i915_pmu.c

-- 
2.9.5

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