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[0/3] Engine busyness v2

Message ID 20230922222510.2235213-1-John.C.Harrison@Intel.com (mailing list archive)
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Series Engine busyness v2 | expand

Message

John Harrison Sept. 22, 2023, 10:25 p.m. UTC 
From: John Harrison <John.C.Harrison@Intel.com>

The latest GuC implements a new and improved scheme for tracking
engine busyness. So make use of it.

Note that this change comes along with a new set of PMU counters. The
old counters have a fundamental problem that they are defined in terms
of wall time but the sampling is now all done by the GPU in terms of
clock ticks. This leads to issues with timebase conversion, some of
which are non-trivial.

For existing platforms, the old counters will still be updated by the
new scheme and will still suffer all the same issues. For newer
platforms (MTL onwards), the old counters are no longer supported.

Instead, there is a new set of tick based counters. These include the
actual busyness count per engine plus a total ticks count. The
intention is that they should be queried as an atomic pair and used
together to determine a busyness percentage. No assumptions may be made
about tick frequencies or relations to wall time.

Test-with: 20230922215233.2438200-1-umesh.nerlige.ramappa@intel.com
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>


John Harrison (1):
  drm/i915/guc: Support new and improved engine busyness

Umesh Nerlige Ramappa (2):
  drm/i915/mtl: Add a PMU counter for total active ticks
  drm/i915/mtl: Add counters for engine busyness ticks

 drivers/gpu/drm/i915/gt/intel_engine.h        |   1 +
 drivers/gpu/drm/i915/gt/intel_engine_cs.c     |  16 +
 drivers/gpu/drm/i915/gt/intel_engine_types.h  |  16 +-
 drivers/gpu/drm/i915/gt/intel_engine_user.c   |   1 +
 .../gpu/drm/i915/gt/uc/abi/guc_actions_abi.h  |   4 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |  82 ++--
 drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c    |  55 ++-
 drivers/gpu/drm/i915/gt/uc/intel_guc_ads.h    |   9 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc_fwif.h   |  23 +-
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 460 ++++++++++++++----
 .../gpu/drm/i915/gt/uc/intel_guc_submission.h |   1 +
 drivers/gpu/drm/i915/i915_pmu.c               |  31 +-
 drivers/gpu/drm/i915/i915_pmu.h               |   2 +-
 include/uapi/drm/i915_drm.h                   |  15 +-
 14 files changed, 570 insertions(+), 146 deletions(-)