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authorChristian König <ckoenig.leichtzumerken@gmail.com>2022-01-24 16:03:24 +0300
committerChristian König <christian.koenig@amd.com>2022-03-25 16:18:23 +0300
commitcaaf2ae712b7cc3c7717898fe267dbf882a502ef (patch)
tree3e68b66e021ef93c8c4fe132915ed5166e23f1b8 /drivers/dma-buf/dma-fence-array.c
parent7344bad7fb6daa4877a1c064b52c7d5f9182c41b (diff)
downloadlinux-caaf2ae712b7cc3c7717898fe267dbf882a502ef.tar.xz
dma-buf: Add dma_fence_array_for_each (v2)
Add a helper to iterate over all fences in a dma_fence_array object. v2 (Jason Ekstrand) - Return NULL from dma_fence_array_first if head == NULL. This matches the iterator behavior of dma_fence_chain_for_each in that it iterates zero times if head == NULL. - Return NULL from dma_fence_array_next if index > array->num_fences. Signed-off-by: Jason Ekstrand <jason@jlekstrand.net> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Reviewed-by: Christian König <christian.koenig@amd.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210610210925.642582-2-jason@jlekstrand.net Signed-off-by: Christian König <christian.koenig@amd.com>
Diffstat (limited to 'drivers/dma-buf/dma-fence-array.c')
-rw-r--r--drivers/dma-buf/dma-fence-array.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
index cb1bacb5a42b..52b85d292383 100644
--- a/drivers/dma-buf/dma-fence-array.c
+++ b/drivers/dma-buf/dma-fence-array.c
@@ -219,3 +219,30 @@ bool dma_fence_match_context(struct dma_fence *fence, u64 context)
return true;
}
EXPORT_SYMBOL(dma_fence_match_context);
+
+struct dma_fence *dma_fence_array_first(struct dma_fence *head)
+{
+ struct dma_fence_array *array;
+
+ if (!head)
+ return NULL;
+
+ array = to_dma_fence_array(head);
+ if (!array)
+ return head;
+
+ return array->fences[0];
+}
+EXPORT_SYMBOL(dma_fence_array_first);
+
+struct dma_fence *dma_fence_array_next(struct dma_fence *head,
+ unsigned int index)
+{
+ struct dma_fence_array *array = to_dma_fence_array(head);
+
+ if (!array || index >= array->num_fences)
+ return NULL;
+
+ return array->fences[index];
+}
+EXPORT_SYMBOL(dma_fence_array_next);