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@xxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_wait.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_wait.c b/drivers/gpu/drm/i915/gem/i915_gem_wait.c
index 26ec6579b7cd..fa46a54bcbe7 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_wait.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_wait.c
@@ -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;
--
2.17.1
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