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dma-buf: try to replace a signaled fence in reservation_object_add_shared_inplace

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

Optimize the handling by replacing a signaled fence when adding a new
shared one.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171114142436.1360-2-christian.koenig@amd.com
This commit is contained in:
Christian König 2017-11-14 15:24:36 +01:00 committed by Alex Deucher
parent 4d9c62e8ce
commit ca25fe5efe
1 changed files with 15 additions and 3 deletions
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14
drivers/dma-buf/reservation.c
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@ -104,7 +104,8 @@ reservation_object_add_shared_inplace(struct reservation_object *obj,
struct reservation_object_list *fobj,
struct dma_fence *fence)
{
u32 i;
struct dma_fence *signaled = NULL;
u32 i, signaled_idx;
dma_fence_get(fence);
@ -126,17 +127,28 @@ reservation_object_add_shared_inplace(struct reservation_object *obj,
dma_fence_put(old_fence);
return;
}
if (!signaled && dma_fence_is_signaled(old_fence)) {
signaled = old_fence;
signaled_idx = i;
}
}
/*
* memory barrier is added by write_seqcount_begin,
* fobj->shared_count is protected by this lock too
*/
if (signaled) {
RCU_INIT_POINTER(fobj->shared[signaled_idx], fence);
} else {
RCU_INIT_POINTER(fobj->shared[fobj->shared_count], fence);
fobj->shared_count++;
}
write_seqcount_end(&obj->seq);
preempt_enable();
dma_fence_put(signaled);
}
static void