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

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);
}
/**