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| author | Rob Clark <robdclark@chromium.org> | 2021-09-03 11:47:52 -0700 |
|---|---|---|
| committer | Rob Clark <robdclark@chromium.org> | 2023-03-25 10:55:07 -0700 |
| commit | aec11c8d7cb31c67deeba4c9fe015d09735c6813 (patch) | |
| tree | 7c9198c39b8bdeff6c5ad8559902e74ed3e7f79b /Documentation/driver-api | |
| parent | eeac8ede17557680855031c6f305ece2378af326 (diff) | |
dma-buf/dma-fence: Add deadline awareness
Add a way to hint to the fence signaler of an upcoming deadline, such as
vblank, which the fence waiter would prefer not to miss. This is to aid
the fence signaler in making power management decisions, like boosting
frequency as the deadline approaches and awareness of missing deadlines
so that can be factored in to the frequency scaling.
v2: Drop dma_fence::deadline and related logic to filter duplicate
deadlines, to avoid increasing dma_fence size. The fence-context
implementation will need similar logic to track deadlines of all
the fences on the same timeline. [ckoenig]
v3: Clarify locking wrt. set_deadline callback
v4: Clarify in docs comment that this is a hint
v5: Drop DMA_FENCE_FLAG_HAS_DEADLINE_BIT.
v6: More docs
v7: Fix typo, clarify past deadlines
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Diffstat (limited to 'Documentation/driver-api')
| -rw-r--r-- | Documentation/driver-api/dma-buf.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/driver-api/dma-buf.rst b/Documentation/driver-api/dma-buf.rst index 2e8dfd1a66b6..0625e7e21f6f 100644 --- a/Documentation/driver-api/dma-buf.rst +++ b/Documentation/driver-api/dma-buf.rst @@ -164,6 +164,12 @@ DMA Fence Signalling Annotations .. kernel-doc:: drivers/dma-buf/dma-fence.c :doc: fence signalling annotation +DMA Fence Deadline Hints +~~~~~~~~~~~~~~~~~~~~~~~~ + +.. kernel-doc:: drivers/dma-buf/dma-fence.c + :doc: deadline hints + DMA Fences Functions Reference ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |