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drm/amdgpu: add amdgpu_sync_clone 

Cloning a sync object is useful for waiting for a sync object
without locking the original structure indefinitely, blocking
other threads.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
hifive-unleashed-5.1
Felix Kuehling 2018-02-06 20:32:37 -05:00 committed by Oded Gabbay
parent 155494dbbb
commit 3c728d3aa1
2 changed files with 36 additions and 0 deletions
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35
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
View File

@ -322,6 +322,41 @@ struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync, bool *explicit
return NULL;
}
/**
* amdgpu_sync_clone - clone a sync object
*
* @source: sync object to clone
* @clone: pointer to destination sync object
*
* Adds references to all unsignaled fences in @source to @clone. Also
* removes signaled fences from @source while at it.
*/
int amdgpu_sync_clone(struct amdgpu_sync *source, struct amdgpu_sync *clone)
{
struct amdgpu_sync_entry *e;
struct hlist_node *tmp;
struct dma_fence *f;
int i, r;
hash_for_each_safe(source->fences, i, tmp, e, node) {
f = e->fence;
if (!dma_fence_is_signaled(f)) {
r = amdgpu_sync_fence(NULL, clone, f, e->explicit);
if (r)
return r;
} else {
hash_del(&e->node);
dma_fence_put(f);
kmem_cache_free(amdgpu_sync_slab, e);
}
}
dma_fence_put(clone->last_vm_update);
clone->last_vm_update = dma_fence_get(source->last_vm_update);
return 0;
}
int amdgpu_sync_wait(struct amdgpu_sync *sync, bool intr)
{
struct amdgpu_sync_entry *e;

1
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
View File

@ -50,6 +50,7 @@ int amdgpu_sync_resv(struct amdgpu_device *adev,
struct dma_fence *amdgpu_sync_peek_fence(struct amdgpu_sync *sync,
struct amdgpu_ring *ring);
struct dma_fence *amdgpu_sync_get_fence(struct amdgpu_sync *sync, bool *explicit);
int amdgpu_sync_clone(struct amdgpu_sync *source, struct amdgpu_sync *clone);
int amdgpu_sync_wait(struct amdgpu_sync *sync, bool intr);
void amdgpu_sync_free(struct amdgpu_sync *sync);
int amdgpu_sync_init(void);