drm/i915/selftests: Try to detect rollback during batchbuffer preemption

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Since batch buffers dominant execution time, most preemption requests
should naturally occur during execution of a batch buffer. We wish to
verify that should a preemption occur within a batch buffer, when we
come to restart that batch buffer, it occurs at the interrupted
instruction and most importantly does not rollback to an earlier point.

v2: Do not clear the GPR at the start of the batch, but rely on them
being clear for new contexts.

Suggested-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200422100903.25216-1-chris@chris-wilson.co.uk

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Chris Wilson 2020-04-22 11:09:03 +01:00

parent cbb6f8805a

commit c92724de6d

1 changed files with 328 additions and 1 deletions

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

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