[PATCH v3 04/13] drm/xe/hw_engine_group: Add helper to suspend faulting LR jobs

[Francois Dugast]

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)

Signed-off-by: Francois Dugast <francois.dugast at intel.com>
---
 drivers/gpu/drm/xe/xe_hw_engine_group.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_hw_engine_group.c b/drivers/gpu/drm/xe/xe_hw_engine_group.c
index da1515068850..4dabb0e8908a 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine_group.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine_group.c
@@ -149,3 +149,28 @@ 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
+ */
+static void xe_hw_engine_group_suspend_faulting_lr_jobs(struct xe_hw_engine_group *group)
+{
+	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;
+
+		q->ops->suspend_wait(q);
+	}
+}
-- 
2.43.0