The reservation object should be capable of handling its internal memory
management itself. And since we search for a free slot to add the fence
from the beginning this is actually a waste of time and only minimal helpful.
Drop it to allow removal of the seqno handling in the reservation object.
This essentially reverts commit "drm/i915: Remove completed fences after a wait".
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_wait.c | 27 ------------------------
1 file changed, 27 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..bb64ec6bef8e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_wait.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_wait.c
@@ -35,9 +35,7 @@ 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;
if (flags & I915_WAIT_ALL) {
struct dma_fence **shared;
@@ -61,17 +59,6 @@ i915_gem_object_wait_reservation(struct reservation_object *resv,
for (; i < count; i++)
dma_fence_put(shared[i]);
kfree(shared);
-
- /*
- * If both shared fences and an exclusive fence exist,
- * then by construction the shared fences must be later
- * than the exclusive fence. If we successfully wait for
- * all the shared fences, we know that the exclusive fence
- * must all be signaled. If all the shared fences are
- * signaled, we can prune the array and recover the
- * floating references on the fences/requests.
- */
- prune_fences = count && timeout >= 0;
} else {
excl = reservation_object_get_excl_rcu(resv);
}
@@ -80,20 +67,6 @@ i915_gem_object_wait_reservation(struct reservation_object *resv,
timeout = i915_gem_object_wait_fence(excl, flags, timeout);
dma_fence_put(excl);
-
- /*
- * 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).
- */
- 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);
- }
- }
-
return timeout;
}
--
2.17.1
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