drm/i915/gt: Remove virtual breadcrumb before transfer

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The issue with stale virtual breadcrumbs remain. Now we have the problem
that if the irq-signaler is still referencing the stale breadcrumb as we
transfer it to a new sibling, the list becomes spaghetti. This is a very
small window, but that doesn't stop it being hit infrequently. To
prevent the lists being tangled (the iterator starting on one engine's
b->signalers but walking onto another list), always decouple the virtual
breadcrumb on schedule-out and make sure that the walker has stepped out
of the lists.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201224135544.1713-5-chris@chris-wilson.co.uk

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Chris Wilson 2020-12-24 13:55:40 +00:00

parent 6f0726b480

commit bab0557c8d

2 changed files with 18 additions and 2 deletions

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5

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

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15

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

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