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

Tvrtko Ursulin
2017-10-11T12:55:25Z

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