dma-buf: add dma_fence_timestamp helper

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commit b83ce9cb4a upstream.

When a fence signals there is a very small race window where the timestamp
isn't updated yet. sync_file solves this by busy waiting for the
timestamp to appear, but on other ocassions didn't handled this
correctly.

Provide a dma_fence_timestamp() helper function for this and use it in
all appropriate cases.

Another alternative would be to grab the spinlock when that happens.

v2 by teddy: add a wait parameter to wait for the timestamp to show up, in case
   the accurate timestamp is needed and/or the timestamp is not based on
   ktime (e.g. hw timestamp)
v3 chk: drop the parameter again for unified handling

Signed-off-by: Yunxiang Li <Yunxiang.Li@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Fixes: 1774baa64f ("drm/scheduler: Change scheduled fence track v2")
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20230929104725.2358-1-christian.koenig@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Christian König 2023-09-08 10:27:23 +02:00 • committed by Greg Kroah-Hartman

parent cb8f1dd1b7

commit d67b5a2b97

4 changed files with 27 additions and 16 deletions

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13

drivers/dma-buf/dma-fence-unwrap.c

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9

drivers/dma-buf/sync_file.c

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2

drivers/gpu/drm/scheduler/sched_main.c

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19

include/linux/dma-fence.h

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