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drm/xe: Add xe_exec_queue_last_fence_test_dep

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Helpful to determine if a bind can immediately use CPU or needs to be
deferred a drm scheduler job.

v7:
 - Better wording in kernel doc (Matthew Auld)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240704041652.272920-4-matthew.brost@intel.com
This commit is contained in:
Matthew Brost
2024-07-03 21:16:48 -07:00
parent 2e524668c4
commit 96e7ebb220
2 changed files with 25 additions and 0 deletions
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23
drivers/gpu/drm/xe/xe_exec_queue.c
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@@ -906,3 +906,26 @@ void xe_exec_queue_last_fence_set(struct xe_exec_queue *q, struct xe_vm *vm,
xe_exec_queue_last_fence_put(q, vm);
q->last_fence = dma_fence_get(fence);
}
/**
* xe_exec_queue_last_fence_test_dep - Test last fence dependency of queue
* @q: The exec queue
* @vm: The VM the engine does a bind or exec for
*
* Returns:
* -ETIME if there exists an unsignalled last fence dependency, zero otherwise.
*/
int xe_exec_queue_last_fence_test_dep(struct xe_exec_queue *q, struct xe_vm *vm)
{
struct dma_fence *fence;
int err = 0;
fence = xe_exec_queue_last_fence_get(q, vm);
if (fence) {
err = test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags) ?
0 : -ETIME;
dma_fence_put(fence);
}
return err;
}