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dma-buf: keep only not signaled fence in reservation_object_add_shared_replace v3

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The amdgpu issue to also need signaled fences in the reservation objects
should be fixed by now.

Optimize the list by keeping only the not signaled yet fences around.

v2: temporary put the signaled fences at the end of the new container
v3: put the old fence at the end of the new container as well.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114142436.1360-1-christian.koenig@amd.com
This commit is contained in:
Christian König 2017-11-14 15:24:35 +01:00 committed by Alex Deucher
parent 0c51ef8684
commit 4d9c62e8ce
1 changed files with 21 additions and 17 deletions
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38
drivers/dma-buf/reservation.c
View file

@ -145,8 +145,7 @@ reservation_object_add_shared_replace(struct reservation_object *obj,
struct reservation_object_list *fobj,
struct dma_fence *fence)
{
unsigned i;
struct dma_fence *old_fence = NULL;
unsigned i, j, k;
dma_fence_get(fence);
@ -162,24 +161,21 @@ reservation_object_add_shared_replace(struct reservation_object *obj,
* references from the old struct are carried over to
* the new.
*/
fobj->shared_count = old->shared_count;
for (i = 0; i < old->shared_count; ++i) {
for (i = 0, j = 0, k = fobj->shared_max; i < old->shared_count; ++i) {
struct dma_fence *check;
check = rcu_dereference_protected(old->shared[i],
reservation_object_held(obj));
if (!old_fence && check->context == fence->context) {
old_fence = check;
RCU_INIT_POINTER(fobj->shared[i], fence);
} else
RCU_INIT_POINTER(fobj->shared[i], check);
}
if (!old_fence) {
RCU_INIT_POINTER(fobj->shared[fobj->shared_count], fence);
fobj->shared_count++;
if (check->context == fence->context ||
dma_fence_is_signaled(check))
RCU_INIT_POINTER(fobj->shared[--k], check);
else
RCU_INIT_POINTER(fobj->shared[j++], check);
}
fobj->shared_count = j;
RCU_INIT_POINTER(fobj->shared[fobj->shared_count], fence);
fobj->shared_count++;
done:
preempt_disable();
@ -192,10 +188,18 @@ reservation_object_add_shared_replace(struct reservation_object *obj,
write_seqcount_end(&obj->seq);
preempt_enable();
if (old)
kfree_rcu(old, rcu);
if (!old)
return;
dma_fence_put(old_fence);
/* Drop the references to the signaled fences */
for (i = k; i < fobj->shared_max; ++i) {
struct dma_fence *f;
f = rcu_dereference_protected(fobj->shared[i],
reservation_object_held(obj));
dma_fence_put(f);
}
kfree_rcu(old, rcu);
}
/**