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| author | Christian König <christian.koenig@amd.com> | 2025-12-19 11:41:54 +0100 |
|---|---|---|
| committer | Christian König <christian.koenig@amd.com> | 2026-02-05 11:02:56 +0100 |
| commit | 2bcbc706dfa02ae50118173a6f6d8a12e735480c (patch) | |
| tree | 9fcaf1eaca2d7a94cb3001e085bb5e5d26358c01 /include | |
| parent | 2bebc88d5e37ddcb5ea5039a39f39527662b27f0 (diff) | |
| download | linux-2bcbc706dfa02ae50118173a6f6d8a12e735480c.tar.gz linux-2bcbc706dfa02ae50118173a6f6d8a12e735480c.zip | |
dma-buf: add dma_fence_was_initialized function v2
Some driver use fence->ops to test if a fence was initialized or not.
The problem is that this utilizes internal behavior of the dma_fence
implementation.
So better abstract that into a function.
v2: use a flag instead of testing fence->ops, rename the function, move
to the beginning of the patch set.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Link: https://lore.kernel.org/r/20260120105655.7134-2-christian.koenig@amd.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-fence.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h index d4c92fd35092..9c4d25289239 100644 --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -48,6 +48,7 @@ struct seq_file; * atomic ops (bit_*), so taking the spinlock will not be needed most * of the time. * + * DMA_FENCE_FLAG_INITIALIZED_BIT - fence was initialized * DMA_FENCE_FLAG_SIGNALED_BIT - fence is already signaled * DMA_FENCE_FLAG_TIMESTAMP_BIT - timestamp recorded for fence signaling * DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT - enable_signaling might have been called @@ -98,6 +99,7 @@ struct dma_fence { }; enum dma_fence_flag_bits { + DMA_FENCE_FLAG_INITIALIZED_BIT, DMA_FENCE_FLAG_SEQNO64_BIT, DMA_FENCE_FLAG_SIGNALED_BIT, DMA_FENCE_FLAG_TIMESTAMP_BIT, @@ -264,6 +266,19 @@ void dma_fence_free(struct dma_fence *fence); void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq); /** + * dma_fence_was_initialized - test if fence was initialized + * @fence: fence to test + * + * Return: True if fence was ever initialized, false otherwise. Works correctly + * only when memory backing the fence structure is zero initialized on + * allocation. + */ +static inline bool dma_fence_was_initialized(struct dma_fence *fence) +{ + return fence && test_bit(DMA_FENCE_FLAG_INITIALIZED_BIT, &fence->flags); +} + +/** * dma_fence_put - decreases refcount of the fence * @fence: fence to reduce refcount of */ |