drm/i915/gt: Add a safety submission flush in the heartbeat

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Just in case everything fails (like for example "missed interrupt
syndrome" on Sandybridge), always flush the submission tasklet from the
heartbeat. This papers over such issues, but will still appear as a
second long glitch, and prevents us from detecting it unless we happen
to be performing a timed test.

v2: We rely on flush_submission() synchronizing with the tasklet on
another CPU.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200615165013.22973-3-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2020-06-15 17:50:13 +01:00

parent f2e85e5736

commit 5948938700

2 changed files with 14 additions and 12 deletions

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23

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

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3

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

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