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| author |   Christian König <christian.koenig@amd.com> | 2021-06-15 15:10:03 +0200 |
|---|---|---|
| committer | Christian König <christian.koenig@amd.com> | 2021-10-07 14:49:11 +0200 |
| commit | 5baaac3184ab896d74993825858f1b1a46c460ce (patch) | |
| tree | 237b794f7a37d8a4abcfba5e3cc4962bf5fae5e5 /include/linux/dma-resv.h | |
| parent | drm/connector: refer to CTA-861-G in the "content type" prop docs (diff) | |
| download | wireguard-linux-5baaac3184ab896d74993825858f1b1a46c460ce.tar.xz wireguard-linux-5baaac3184ab896d74993825858f1b1a46c460ce.zip | |
dma-buf: add dma_resv_for_each_fence v3
A simpler version of the iterator to be used when the dma_resv object is
locked.
v2: fix index check here as well
v3: minor coding improvement, some documentation cleanup
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211006123609.2026-1-christian.koenig@amd.com
Diffstat (limited to 'include/linux/dma-resv.h')
| -rw-r--r-- | include/linux/dma-resv.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h index 764138ad8583..491359cea54c 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -179,6 +179,8 @@ struct dma_resv_iter { struct dma_fence *dma_resv_iter_first_unlocked(struct dma_resv_iter *cursor); struct dma_fence *dma_resv_iter_next_unlocked(struct dma_resv_iter *cursor); +struct dma_fence *dma_resv_iter_first(struct dma_resv_iter *cursor); +struct dma_fence *dma_resv_iter_next(struct dma_resv_iter *cursor); /** * dma_resv_iter_begin - initialize a dma_resv_iter object @@ -244,6 +246,24 @@ static inline bool dma_resv_iter_is_restarted(struct dma_resv_iter *cursor) for (fence = dma_resv_iter_first_unlocked(cursor); \ fence; fence = dma_resv_iter_next_unlocked(cursor)) +/** + * dma_resv_for_each_fence - fence iterator + * @cursor: a struct dma_resv_iter pointer + * @obj: a dma_resv object pointer + * @all_fences: true if all fences should be returned + * @fence: the current fence + * + * Iterate over the fences in a struct dma_resv object while holding the + * &dma_resv.lock. @all_fences controls if the shared fences are returned as + * well. The cursor initialisation is part of the iterator and the fence stays + * valid as long as the lock is held and so no extra reference to the fence is + * taken. + */ +#define dma_resv_for_each_fence(cursor, obj, all_fences, fence) \ + for (dma_resv_iter_begin(cursor, obj, all_fences), \ + fence = dma_resv_iter_first(cursor); fence; \ + fence = dma_resv_iter_next(cursor)) + #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base) #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base) |