drm/i915/gt: Always report the sample time for busy-stats

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Return the monotonic timestamp (ktime_get()) at the time of sampling the
busy-time. This is used in preference to taking ktime_get() separately
before or after the read seqlock as there can be some large variance in
reported timestamps. For selftests trying to ascertain that we are
reporting accurate to within a few microseconds, even a small delay
leads to the test failing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200617130916.15261-2-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2020-06-17 14:09:16 +01:00

parent 1b90e4a43b

commit 810b7ee300

6 changed files with 66 additions and 44 deletions

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3

drivers/gpu/drm/i915/gt/intel_engine.h

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12

drivers/gpu/drm/i915/gt/intel_engine_cs.c

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9

drivers/gpu/drm/i915/gt/intel_rps.c

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18

drivers/gpu/drm/i915/gt/selftest_engine_pm.c

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5

drivers/gpu/drm/i915/i915_pmu.c

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63

drivers/gpu/drm/i915/selftests/i915_request.c

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