drm/i915/gt: Only retire on the last breadcrumb if the last request

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We use the completion of the last active breadcrumb to retire the
requests along a timeline. This is purely opportunistic as nothing
guarantees that any particular timeline is terminated by a breadcrumb;
except for parking the engine where we explicitly add a breadcrumb so
that we park quickly and do an explicit retire upon signaling to reduce
the latency dramatically (avoiding a retire worker roundtrip).

With scheduling, we anticipate retiring completed timelines as a matter
of course. Performing the same action from inside the breadcrumbs is
intended to provide similar functionality for legacy ringbuffer
submission.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210108204026.20682-5-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2021-01-08 20:40:24 +00:00

parent 2b2985a417

commit b1ad5f6d68

3 changed files with 13 additions and 6 deletions

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10

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

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2

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

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7

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

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