[PATCH 0/3] Fix some races/bugs in GuC engine busyness

[Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>]

A few races and bugs in PMU busyness implementation are resulting in a wide
range of IGT failures. This series addresses some failures that are easily
reproduced.

To repro the issues, we run a couple iterations of igt@perf_pmu@busy-hang
followed by igt@perf_pmu@most-busy-idle-check-all test.

v2: Review rework

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>

Umesh Nerlige Ramappa (3):
  i915/guc: Reset engine utilization buffer before registration
  i915/guc: Ensure busyness counter increases motonically
  i915/guc: Accumulate active runtime on gt reset

 drivers/gpu/drm/i915/gt/intel_engine_types.h  |  5 +++
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 41 ++++++++++++++++++-
 2 files changed, 44 insertions(+), 2 deletions(-)

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2.34.1