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drm/i915: stop using seqcount for fence pruning

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After waiting for a reservation object use reservation_object_test_signaled_rcu
to opportunistically prune the fences on the object.

This allows removal of the seqcount handling in the reservation object.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/322032/?series=64786&rev=1
This commit is contained in:
Christian König 2019-08-05 13:18:43 +02:00
parent 96e95496b0
commit 4c2488cfaa
1 changed files with 5 additions and 9 deletions
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14
drivers/gpu/drm/i915/gem/i915_gem_wait.c
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@ -35,7 +35,6 @@ i915_gem_object_wait_reservation(struct reservation_object *resv,
unsigned int flags,
long timeout)
{
unsigned int seq = __read_seqcount_begin(&resv->seq);
struct dma_fence *excl;
bool prune_fences = false;
@ -83,15 +82,12 @@ i915_gem_object_wait_reservation(struct reservation_object *resv,
/*
* Opportunistically prune the fences iff we know they have *all* been
* signaled and that the reservation object has not been changed (i.e.
* no new fences have been added).
* signaled.
*/
if (prune_fences && !__read_seqcount_retry(&resv->seq, seq)) {
if (reservation_object_trylock(resv)) {
if (!__read_seqcount_retry(&resv->seq, seq))
reservation_object_add_excl_fence(resv, NULL);
reservation_object_unlock(resv);
}
if (prune_fences && reservation_object_trylock(resv)) {
if (reservation_object_test_signaled_rcu(resv, true))
reservation_object_add_excl_fence(resv, NULL);
reservation_object_unlock(resv);
}
return timeout;