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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
This commit is contained in:
Chris Wilson 2017-06-29 13:59:24 +01:00 committed by Gustavo Padovan
parent faa8b0b753
commit 8111477663
1 changed files with 14 additions and 1 deletions
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15
include/linux/dma-fence.h
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@ -335,6 +335,19 @@ dma_fence_is_signaled(struct dma_fence *fence)
return false; return false;
} }
/**
* __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 * dma_fence_is_later - return if f1 is chronologically later than f2
* @f1: [in] the first fence from the same context * @f1: [in] the first 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)) if (WARN_ON(f1->context != f2->context))
return false; return false;
return (int)(f1->seqno - f2->seqno) > 0; return __dma_fence_is_later(f1->seqno, f2->seqno);
} }
/** /**