diff options
| author | Christian König <christian.koenig@amd.com> | 2025-10-09 11:40:06 +0300 |
|---|---|---|
| committer | Christian König <christian.koenig@amd.com> | 2026-02-23 18:14:19 +0300 |
| commit | 3e5067931b5df667f5350fafe4410554e228e53e (patch) | |
| tree | 6563dbcaae6e4c6cba8e4def09d93db46d98f6e8 /include | |
| parent | 541c8f2468b933acc5d129e84bd264923675a66e (diff) | |
| download | linux-3e5067931b5df667f5350fafe4410554e228e53e.tar.xz | |
dma-buf: abstract fence locking v2
Add dma_fence_lock_irqsafe() and dma_fence_unlock_irqrestore() wrappers
and mechanically apply them everywhere.
Just a pre-requisite cleanup for a follow up patch.
v2: add some missing i915 bits, add abstraction for lockdep assertion as
well
v3: one more suggestion by Tvrtko
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Link: https://lore.kernel.org/r/20260219160822.1529-4-christian.koenig@amd.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dma-fence.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h index 9ff2c4a09cdc..85d6eac9fa85 100644 --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -377,6 +377,44 @@ dma_fence_get_rcu_safe(struct dma_fence __rcu **fencep) } while (1); } +/** + * dma_fence_spinlock - return pointer to the spinlock protecting the fence + * @fence: the fence to get the lock from + * + * Return the pointer to the extern lock. + */ +static inline spinlock_t *dma_fence_spinlock(struct dma_fence *fence) +{ + return fence->lock; +} + +/** + * dma_fence_lock_irqsave - irqsave lock the fence + * @fence: the fence to lock + * @flags: where to store the CPU flags. + * + * Lock the fence, preventing it from changing to the signaled state. + */ +#define dma_fence_lock_irqsave(fence, flags) \ + spin_lock_irqsave(fence->lock, flags) + +/** + * dma_fence_unlock_irqrestore - unlock the fence and irqrestore + * @fence: the fence to unlock + * @flags the CPU flags to restore + * + * Unlock the fence, allowing it to change it's state to signaled again. + */ +#define dma_fence_unlock_irqrestore(fence, flags) \ + spin_unlock_irqrestore(fence->lock, flags) + +/** + * dma_fence_assert_held - lockdep assertion that fence is locked + * @fence: the fence which should be locked + */ +#define dma_fence_assert_held(fence) \ + lockdep_assert_held(dma_fence_spinlock(fence)); + #ifdef CONFIG_LOCKDEP bool dma_fence_begin_signalling(void); void dma_fence_end_signalling(bool cookie); |