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drm/xe/hw_engine_group: Add helper to suspend faulting LR jobs

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This is a required feature for dma fence jobs to preempt faulting long
running jobs in order to ensure mutual exclusion on a given hw engine
group.

v2: Pipeline calls to suspend(q) and suspend_wait(q) to improve
    efficiency, switch to lockdep_assert_held_write (Matt Brost)

v3: Return error on suspend_wait failure to propagate on the call stack
    up to IOCTL (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/20240809155156.1955925-5-francois.dugast@intel.com
This commit is contained in:
Francois Dugast 2024-08-09 17:51:29 +02:00 committed by Matthew Brost
parent 7970cb3696
commit 53fdfa19e6
1 changed files with 36 additions and 0 deletions
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36
drivers/gpu/drm/xe/xe_hw_engine_group.c
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@ -166,3 +166,39 @@ void xe_hw_engine_group_del_exec_queue(struct xe_hw_engine_group *group, struct
up_write(&group->mode_sem);
}
/**
* xe_hw_engine_group_suspend_faulting_lr_jobs() - Suspend the faulting LR jobs of this group
* @group: The hw engine group
*
* Return: 0 on success, negative error code on error.
*/
static int xe_hw_engine_group_suspend_faulting_lr_jobs(struct xe_hw_engine_group *group)
{
int err;
struct xe_exec_queue *q;
lockdep_assert_held_write(&group->mode_sem);
list_for_each_entry(q, &group->exec_queue_list, hw_engine_group_link) {
if (!xe_vm_in_fault_mode(q->vm))
continue;
q->ops->suspend(q);
}
list_for_each_entry(q, &group->exec_queue_list, hw_engine_group_link) {
if (!xe_vm_in_fault_mode(q->vm))
continue;
err = q->ops->suspend_wait(q);
if (err)
goto err_suspend;
}
return 0;
err_suspend:
up_write(&group->mode_sem);
return err;
}