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authorChris Wilson <chris@chris-wilson.co.uk>2017-06-29 15:59:24 +0300
committerGustavo Padovan <gustavo.padovan@collabora.com>2017-06-30 00:51:07 +0300
commit8111477663813caa1a4469cfe6afaae36cd04513 (patch)
treec287a1d0472dfaecffa2261d9381ebd14a42be6e /include/linux/dma-fence.h
parentfaa8b0b7534aabdc8095eb05310f04eff4024b36 (diff)
downloadlinux-8111477663813caa1a4469cfe6afaae36cd04513.tar.xz
dma-buf/dma-fence: Extract __dma_fence_is_later()
Often we have the task of comparing two seqno known to be on the same context, so provide a common __dma_fence_is_later(). Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Sean Paul <seanpaul@chromium.org> Cc: Gustavo Padovan <gustavo@padovan.org> Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170629125930.821-1-chris@chris-wilson.co.uk
Diffstat (limited to 'include/linux/dma-fence.h')
-rw-r--r--include/linux/dma-fence.h15
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index a5195a7d6f77..ac5987989e9a 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -336,6 +336,19 @@ dma_fence_is_signaled(struct dma_fence *fence)
}
/**
+ * __dma_fence_is_later - return if f1 is chronologically later than f2
+ * @f1: [in] the first fence's seqno
+ * @f2: [in] the second fence's seqno from the same context
+ *
+ * Returns true if f1 is chronologically later than f2. Both fences must be
+ * from the same context, since a seqno is not common across contexts.
+ */
+static inline bool __dma_fence_is_later(u32 f1, u32 f2)
+{
+ return (int)(f1 - f2) > 0;
+}
+
+/**
* dma_fence_is_later - return if f1 is chronologically later than f2
* @f1: [in] the first fence from the same context
* @f2: [in] the second fence from the same context
@@ -349,7 +362,7 @@ static inline bool dma_fence_is_later(struct dma_fence *f1,
if (WARN_ON(f1->context != f2->context))
return false;
- return (int)(f1->seqno - f2->seqno) > 0;
+ return __dma_fence_is_later(f1->seqno, f2->seqno);
}
/**