diff options
| author | Philipp Stanner <phasta@kernel.org> | 2025-12-01 13:50:05 +0300 |
|---|---|---|
| committer | Philipp Stanner <phasta@kernel.org> | 2025-12-04 17:03:39 +0300 |
| commit | e58b4dea9054c85688c8f639ebdfc8115261dae2 (patch) | |
| tree | fc8551ccf8d59f2399318c90f8c35cfe9035d859 /include | |
| parent | 2976aeb0de77da599ad37691963efbdcb07435ce (diff) | |
| download | linux-e58b4dea9054c85688c8f639ebdfc8115261dae2.tar.xz | |
dma-buf/dma-fence: Add dma_fence_test_signaled_flag()
The dma_fence framework checks at many places whether the signaled flag
of a fence is already set. The code can be simplified and made more
readable by providing a helper function for that.
Add dma_fence_test_signaled_flag(), which only checks whether a fence is
signaled. Use it internally.
Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20251201105011.19386-3-phasta@kernel.org
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-fence.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h index 64639e104110..19972f5d176f 100644 --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -401,6 +401,26 @@ void dma_fence_enable_sw_signaling(struct dma_fence *fence); const char __rcu *dma_fence_driver_name(struct dma_fence *fence); const char __rcu *dma_fence_timeline_name(struct dma_fence *fence); +/* + * dma_fence_test_signaled_flag - Only check whether a fence is signaled yet. + * @fence: the fence to check + * + * This function just checks whether @fence is signaled, without interacting + * with the fence in any way. The user must, therefore, ensure through other + * means that fences get signaled eventually. + * + * This function uses test_bit(), which is thread-safe. Naturally, this function + * should be used opportunistically; a fence could get signaled at any moment + * after the check is done. + * + * Return: true if signaled, false otherwise. + */ +static inline bool +dma_fence_test_signaled_flag(struct dma_fence *fence) +{ + return test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags); +} + /** * dma_fence_is_signaled_locked - Return an indication if the fence * is signaled yet. @@ -418,7 +438,7 @@ const char __rcu *dma_fence_timeline_name(struct dma_fence *fence); static inline bool dma_fence_is_signaled_locked(struct dma_fence *fence) { - if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) + if (dma_fence_test_signaled_flag(fence)) return true; if (fence->ops->signaled && fence->ops->signaled(fence)) { @@ -448,7 +468,7 @@ dma_fence_is_signaled_locked(struct dma_fence *fence) static inline bool dma_fence_is_signaled(struct dma_fence *fence) { - if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) + if (dma_fence_test_signaled_flag(fence)) return true; if (fence->ops->signaled && fence->ops->signaled(fence)) { |