Useful to preallocate dma fence array and then arm in path of reclaim or
a dma fence.
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
drivers/dma-buf/dma-fence-array.c | 81 ++++++++++++++++++++++---------
include/linux/dma-fence-array.h | 7 +++
2 files changed, 66 insertions(+), 22 deletions(-)
diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
index c74ac197d5fe..b03e0a87a5cd 100644
--- a/drivers/dma-buf/dma-fence-array.c
+++ b/drivers/dma-buf/dma-fence-array.c
@@ -144,36 +144,38 @@ const struct dma_fence_ops dma_fence_array_ops = {
EXPORT_SYMBOL(dma_fence_array_ops);
/**
- * dma_fence_array_create - Create a custom fence array
+ * dma_fence_array_alloc - Allocate a custom fence array
+ * @num_fences: [in] number of fences to add in the array
+ *
+ * Return dma fence array on success, NULL on failure
+ */
+struct dma_fence_array *dma_fence_array_alloc(int num_fences)
+{
+ struct dma_fence_array *array;
+
+ return kzalloc(struct_size(array, callbacks, num_fences), GFP_KERNEL);
+}
+EXPORT_SYMBOL(dma_fence_array_alloc);
+
+/**
+ * dma_fence_array_arm - Arm a custom fence array
+ * @array: [in] dma fence array to arm
* @num_fences: [in] number of fences to add in the array
* @fences: [in] array containing the fences
* @context: [in] fence context to use
* @seqno: [in] sequence number to use
* @signal_on_any: [in] signal on any fence in the array
*
- * Allocate a dma_fence_array object and initialize the base fence with
- * dma_fence_init().
- * In case of error it returns NULL.
- *
- * The caller should allocate the fences array with num_fences size
- * and fill it with the fences it wants to add to the object. Ownership of this
- * array is taken and dma_fence_put() is used on each fence on release.
- *
- * If @signal_on_any is true the fence array signals if any fence in the array
- * signals, otherwise it signals when all fences in the array signal.
+ * Implementation of @dma_fence_array_create without allocation. Useful to arm a
+ * preallocated dma fence fence in the path of reclaim or dma fence signaling.
*/
-struct dma_fence_array *dma_fence_array_create(int num_fences,
- struct dma_fence **fences,
- u64 context, unsigned seqno,
- bool signal_on_any)
+void dma_fence_array_arm(struct dma_fence_array *array,
+ int num_fences,
+ struct dma_fence **fences,
+ u64 context, unsigned seqno,
+ bool signal_on_any)
{
- struct dma_fence_array *array;
-
- WARN_ON(!num_fences || !fences);
-
- array = kzalloc(struct_size(array, callbacks, num_fences), GFP_KERNEL);
- if (!array)
- return NULL;
+ WARN_ON(!array || !num_fences || !fences);
array->num_fences = num_fences;
@@ -200,6 +202,41 @@ struct dma_fence_array *dma_fence_array_create(int num_fences,
*/
while (num_fences--)
WARN_ON(dma_fence_is_container(fences[num_fences]));
+}
+EXPORT_SYMBOL(dma_fence_array_arm);
+
+/**
+ * dma_fence_array_create - Create a custom fence array
+ * @num_fences: [in] number of fences to add in the array
+ * @fences: [in] array containing the fences
+ * @context: [in] fence context to use
+ * @seqno: [in] sequence number to use
+ * @signal_on_any: [in] signal on any fence in the array
+ *
+ * Allocate a dma_fence_array object and initialize the base fence with
+ * dma_fence_init().
+ * In case of error it returns NULL.
+ *
+ * The caller should allocate the fences array with num_fences size
+ * and fill it with the fences it wants to add to the object. Ownership of this
+ * array is taken and dma_fence_put() is used on each fence on release.
+ *
+ * If @signal_on_any is true the fence array signals if any fence in the array
+ * signals, otherwise it signals when all fences in the array signal.
+ */
+struct dma_fence_array *dma_fence_array_create(int num_fences,
+ struct dma_fence **fences,
+ u64 context, unsigned seqno,
+ bool signal_on_any)
+{
+ struct dma_fence_array *array;
+
+ array = dma_fence_array_alloc(num_fences);
+ if (!array)
+ return NULL;
+
+ dma_fence_array_arm(array, num_fences, fences,
+ context, seqno, signal_on_any);
return array;
}
diff --git a/include/linux/dma-fence-array.h b/include/linux/dma-fence-array.h
index 29c5650c1038..3466ffc4b803 100644
--- a/include/linux/dma-fence-array.h
+++ b/include/linux/dma-fence-array.h
@@ -79,6 +79,13 @@ to_dma_fence_array(struct dma_fence *fence)
for (index = 0, fence = dma_fence_array_first(head); fence; \
++(index), fence = dma_fence_array_next(head, index))
+struct dma_fence_array *dma_fence_array_alloc(int num_fences);
+void dma_fence_array_arm(struct dma_fence_array *array,
+ int num_fences,
+ struct dma_fence **fences,
+ u64 context, unsigned seqno,
+ bool signal_on_any);
+
struct dma_fence_array *dma_fence_array_create(int num_fences,
struct dma_fence **fences,
u64 context, unsigned seqno,
--
2.34.1
