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authorFelix Kuehling <Felix.Kuehling@amd.com>2018-02-07 04:32:37 +0300
committerOded Gabbay <oded.gabbay@gmail.com>2018-02-07 04:32:37 +0300
commit3c728d3aa1fd5c7c2461835a93ac8fad57813db6 (patch)
treececd89fba4db2b7cab21b4b0d7ee00d38a6484e9 /drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
parent155494dbbbf4d6d6512b8bc2dc6bc483e47e1c71 (diff)
downloadlinux-3c728d3aa1fd5c7c2461835a93ac8fad57813db6.tar.xz
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
index b8d3b87fd43e..2d6f5ec77a68 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -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;