From d5b72a2123dfaf9416b1a1177b4be041f8a8b6d4 Mon Sep 17 00:00:00 2001
From: Philipp Zabel
Date: Fri, 17 Mar 2017 17:34:49 +0100
Subject: 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: Philipp Zabel
Reviewed-by: Gustavo Padovan
Acked-by: Sumit Semwal
Signed-off-by: Sumit Semwal
Link: http://patchwork.freedesktop.org/patch/msgid/1489768492-25190-1-git-send-email-p.zabel@pengutronix.de
---
drivers/dma-buf/dma-fence-array.c | 26 ++++++++++++++++++++++++++
include/linux/dma-fence-array.h | 2 ++
2 files changed, 28 insertions(+)
diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
index 67eb7c8fb88c..0350829ba62e 100644
--- a/drivers/dma-buf/dma-fence-array.c
+++ b/drivers/dma-buf/dma-fence-array.c
@@ -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);
diff --git a/include/linux/dma-fence-array.h b/include/linux/dma-fence-array.h
index 5900945f962d..332a5420243c 100644
--- a/include/linux/dma-fence-array.h
+++ b/include/linux/dma-fence-array.h
@@ -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 */
--
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