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drm/xe/hw_engine_group: Add helper to wait for dma fence jobs

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This is a required feature for faulting long running jobs not to be
submitted while dma fence jobs are running on the hw engine group.

v2: Switch to lockdep_assert_held_write in worker, get a proper reference
    for the last fence (Matt Brost)

v3: Directly call dma_fence_put with the fence ref (Matt Brost)

Signed-off-by: Francois Dugast <francois.dugast@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240809155156.1955925-8-francois.dugast@intel.com
This commit is contained in:
Francois Dugast 2024-08-09 17:51:32 +02:00 committed by Matthew Brost
parent 0d92cd8935
commit 2750ff97ee
1 changed files with 33 additions and 0 deletions
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33
drivers/gpu/drm/xe/xe_hw_engine_group.c
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@ -202,3 +202,36 @@ err_suspend:
up_write(&group->mode_sem);
return err;
}
/**
* xe_hw_engine_group_wait_for_dma_fence_jobs() - Wait for dma fence jobs to complete
* @group: The hw engine group
*
* This function is not meant to be called directly from a user IOCTL as dma_fence_wait()
* is not interruptible.
*
* Return: 0 on success,
* -ETIME if waiting for one job failed
*/
static int xe_hw_engine_group_wait_for_dma_fence_jobs(struct xe_hw_engine_group *group)
{
long timeout;
struct xe_exec_queue *q;
struct dma_fence *fence;
lockdep_assert_held_write(&group->mode_sem);
list_for_each_entry(q, &group->exec_queue_list, hw_engine_group_link) {
if (xe_vm_in_lr_mode(q->vm))
continue;
fence = xe_exec_queue_last_fence_get_for_resume(q, q->vm);
timeout = dma_fence_wait(fence, false);
dma_fence_put(fence);
if (timeout < 0)
return -ETIME;
}
return 0;
}