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dma-fence: Wrap querying the fence->status

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The fence->status is an optional field that is only valid once the fence
has been signaled. (Driver may fill the fence->status with an error code
prior to calling dma_fence_signal().) Given the restriction upon its
validity, wrap querying of the fence->status into a helper
dma_fence_get_status().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170104141222.6992-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-01-04 14:12:21 +00:00 • committed by Sumit Semwal
parent 83dd1376fd
commit d6c99f4bf0
4 changed files with 59 additions and 13 deletions
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24
include/linux/dma-fence.h
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@ -378,6 +378,30 @@ static inline struct dma_fence *dma_fence_later(struct dma_fence *f1,
return dma_fence_is_signaled(f2) ? NULL : f2;
}
/**
* dma_fence_get_status_locked - returns the status upon completion
* @fence: [in] the dma_fence to query
*
* Drivers can supply an optional error status condition before they signal
* the fence (to indicate whether the fence was completed due to an error
* rather than success). The value of the status condition is only valid
* if the fence has been signaled, dma_fence_get_status_locked() first checks
* the signal state before reporting the error status.
*
* Returns 0 if the fence has not yet been signaled, 1 if the fence has
* been signaled without an error condition, or a negative error code
* if the fence has been completed in err.
*/
static inline int dma_fence_get_status_locked(struct dma_fence *fence)
{
if (dma_fence_is_signaled_locked(fence))
return fence->status < 0 ? fence->status : 1;
else
return 0;
}
int dma_fence_get_status(struct dma_fence *fence);
signed long dma_fence_wait_timeout(struct dma_fence *,
bool intr, signed long timeout);
signed long dma_fence_wait_any_timeout(struct dma_fence **fences,