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 at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 35 ++++++++++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h | 1 +
2 files changed, 36 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
index 0cb31d9..b871b97 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -321,6 +321,41 @@ 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;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
index 7aba38d..10cf23a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.h
@@ -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);
--
2.7.4
