drm/i915/selftest: Fix engine timestamp and ktime disparity

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While reading the engine timestamps there can be uncontrollable
concurrent mmio access via other i915 child drivers and by GuC,
which is not truly atomic context as expected by this selftest,
which may cause mmio latency to read the engine timestamps,
Account such latency to calculate time to read engine timestamp
such that selftest can validate the timestamp and ktime pair.

Cc: Chris Wilson <chris.p.wilson@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Badal Nilawar <badal.nilawar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230223100503.3323627-2-anshuman.gupta@intel.com

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This commit is contained in:

Anshuman Gupta 2023-02-23 15:35:02 +05:30

parent 5060060557

commit 29b41cf707

2 changed files with 3 additions and 3 deletions

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2

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

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4

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

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