Am 04.11.2016 um 21:16 schrieb Alex Deucher:
> From: "monk.liu" <monk.liu at amd.com>
>
> Return the index of the first signaled fence. This information
> is useful in some APIs like Vulkan.
>
> v2: rebase on drm-next (fence -> dma_fence)
>
> Signed-off-by: monk.liu <monk.liu at amd.com>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> Cc: Sumit Semwal <sumit.semwal at linaro.org>
Both patches are Reviewed-by: Christian König <christian.koenig at amd.com>.
> ---
>
> This is the same patch set I send out yesterday, I just
> squashed the amdgpu patches together and rebased everything on
> the fence -> dma_fence renaming. This is used by our VK driver
> and we are planning to use it in mesa as well.
>
> drivers/dma-buf/dma-fence.c | 20 +++++++++++++++-----
> include/linux/dma-fence.h | 2 +-
> 2 files changed, 16 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
> index 9ef3c2f..dd00990 100644
> --- a/drivers/dma-buf/dma-fence.c
> +++ b/drivers/dma-buf/dma-fence.c
> @@ -402,14 +402,18 @@ dma_fence_default_wait(struct dma_fence *fence, bool
> intr, signed long timeout)
> EXPORT_SYMBOL(dma_fence_default_wait);
>
> static bool
> -dma_fence_test_signaled_any(struct dma_fence **fences, uint32_t count)
> +dma_fence_test_signaled_any(struct dma_fence **fences, uint32_t count,
> + uint32_t *idx)
> {
> int i;
>
> for (i = 0; i < count; ++i) {
> struct dma_fence *fence = fences[i];
> - if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
> + if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
> + if (idx)
> + *idx = i;
> return true;
> + }
> }
> return false;
> }
> @@ -421,6 +425,7 @@ dma_fence_test_signaled_any(struct dma_fence **fences,
> uint32_t count)
> * @count: [in] number of fences to wait on
> * @intr: [in] if true, do an interruptible wait
> * @timeout: [in] timeout value in jiffies, or
> MAX_SCHEDULE_TIMEOUT
> + * @idx: [out] the first signaled fence index, meaninful only on
> Returns positive
> *
> * Returns -EINVAL on custom fence wait implementation, -ERESTARTSYS if
> * interrupted, 0 if the wait timed out, or the remaining timeout in jiffies
> @@ -432,7 +437,7 @@ dma_fence_test_signaled_any(struct dma_fence **fences,
> uint32_t count)
> */
> signed long
> dma_fence_wait_any_timeout(struct dma_fence **fences, uint32_t count,
> - bool intr, signed long timeout)
> + bool intr, signed long timeout, uint32_t *idx)
> {
> struct default_wait_cb *cb;
> signed long ret = timeout;
> @@ -443,8 +448,11 @@ dma_fence_wait_any_timeout(struct dma_fence **fences,
> uint32_t count,
>
> if (timeout == 0) {
> for (i = 0; i < count; ++i)
> - if (dma_fence_is_signaled(fences[i]))
> + if (dma_fence_is_signaled(fences[i])) {
> + if (idx)
> + *idx = i;
> return 1;
> + }
>
> return 0;
> }
> @@ -467,6 +475,8 @@ dma_fence_wait_any_timeout(struct dma_fence **fences,
> uint32_t count,
> if (dma_fence_add_callback(fence, &cb[i].base,
> dma_fence_default_wait_cb)) {
> /* This fence is already signaled */
> + if (idx)
> + *idx = i;
> goto fence_rm_cb;
> }
> }
> @@ -477,7 +487,7 @@ dma_fence_wait_any_timeout(struct dma_fence **fences,
> uint32_t count,
> else
> set_current_state(TASK_UNINTERRUPTIBLE);
>
> - if (dma_fence_test_signaled_any(fences, count))
> + if (dma_fence_test_signaled_any(fences, count, idx))
> break;
>
> ret = schedule_timeout(ret);
> diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
> index ba60c04..e578fe7 100644
> --- a/include/linux/dma-fence.h
> +++ b/include/linux/dma-fence.h
> @@ -382,7 +382,7 @@ 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,
> uint32_t count,
> - bool intr, signed long timeout);
> + bool intr, signed long timeout, uint32_t
> *idx);
>
> /**
> * dma_fence_wait - sleep until the fence gets signaled
