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Commit d5b72a21 authored by Philipp Zabel's avatar Philipp Zabel Committed by Sumit Semwal
Browse files

dma-fence: add dma_fence_match_context helper 



Add a helper to check if all fences in a fence array are from a given
context. For convenience, the function can also handle being given a
non-array fence.

Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: default avatarGustavo Padovan <gustavo.padovan@collabora.com>
Acked-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1489768492-25190-1-git-send-email-p.zabel@pengutronix.de
parent bb7d7856

drivers/dma-buf/dma-fence-array.c

+26 −0
Original line number Diff line number Diff line
@@ -144,3 +144,29 @@ struct dma_fence_array *dma_fence_array_create(int num_fences, 
	return array;

}

EXPORT_SYMBOL(dma_fence_array_create);



/**

 * dma_fence_match_context - Check if all fences are from the given context

 * @fence:		[in]	fence or fence array

 * @context:		[in]	fence context to check all fences against

 *

 * Checks the provided fence or, for a fence array, all fences in the array

 * against the given context. Returns false if any fence is from a different

 * context.

 */

bool dma_fence_match_context(struct dma_fence *fence, u64 context)

{

	struct dma_fence_array *array = to_dma_fence_array(fence);

	unsigned i;



	if (!dma_fence_is_array(fence))

		return fence->context == context;



	for (i = 0; i < array->num_fences; i++) {

		if (array->fences[i]->context != context)

			return false;

	}



	return true;

}

EXPORT_SYMBOL(dma_fence_match_context);

include/linux/dma-fence-array.h

+2 −0
Original line number Diff line number Diff line
@@ -83,4 +83,6 @@ struct dma_fence_array *dma_fence_array_create(int num_fences, 
					       u64 context, unsigned seqno,

					       bool signal_on_any);



bool dma_fence_match_context(struct dma_fence *fence, u64 context);



#endif /* __LINUX_DMA_FENCE_ARRAY_H */