[PATCH 2/3] drm/xe: Introduce no_preempt exec queue op

[Ashutosh Dixit]

Introduce no_preempt exec queue op to allow an exec queue to run
uninterrupted (without preemption or timeslicing). The functionality is
used in OA in the next patch.

Cc: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
---
 drivers/gpu/drm/xe/xe_exec_queue_types.h |  2 ++
 drivers/gpu/drm/xe/xe_execlist.c         |  7 +++++
 drivers/gpu/drm/xe/xe_guc_submit.c       | 36 ++++++++++++++++++++++++
 3 files changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_exec_queue_types.h b/drivers/gpu/drm/xe/xe_exec_queue_types.h
index 201588ec33c3..52e281158b15 100644
--- a/drivers/gpu/drm/xe/xe_exec_queue_types.h
+++ b/drivers/gpu/drm/xe/xe_exec_queue_types.h
@@ -164,6 +164,8 @@ struct xe_exec_queue_ops {
 	int (*set_timeslice)(struct xe_exec_queue *q, u32 timeslice_us);
 	/** @set_preempt_timeout: Set preemption timeout for exec queue */
 	int (*set_preempt_timeout)(struct xe_exec_queue *q, u32 preempt_timeout_us);
+	/** @no_preempt: Disable preemption and timeslicing for exec queue */
+	int (*no_preempt)(struct xe_exec_queue *q, bool enable);
 	/**
 	 * @suspend: Suspend exec queue from executing, allowed to be called
 	 * multiple times in a row before resume with the caveat that
diff --git a/drivers/gpu/drm/xe/xe_execlist.c b/drivers/gpu/drm/xe/xe_execlist.c
index db906117db6d..15392c1d7005 100644
--- a/drivers/gpu/drm/xe/xe_execlist.c
+++ b/drivers/gpu/drm/xe/xe_execlist.c
@@ -416,6 +416,12 @@ static int execlist_exec_queue_set_preempt_timeout(struct xe_exec_queue *q,
 	return 0;
 }
 
+static int execlist_exec_queue_no_preempt(struct xe_exec_queue *q, bool enable)
+{
+	/* NIY */
+	return 0;
+}
+
 static int execlist_exec_queue_suspend(struct xe_exec_queue *q)
 {
 	/* NIY */
@@ -446,6 +452,7 @@ static const struct xe_exec_queue_ops execlist_exec_queue_ops = {
 	.set_priority = execlist_exec_queue_set_priority,
 	.set_timeslice = execlist_exec_queue_set_timeslice,
 	.set_preempt_timeout = execlist_exec_queue_set_preempt_timeout,
+	.no_preempt = execlist_exec_queue_no_preempt,
 	.suspend = execlist_exec_queue_suspend,
 	.suspend_wait = execlist_exec_queue_suspend_wait,
 	.resume = execlist_exec_queue_resume,
diff --git a/drivers/gpu/drm/xe/xe_guc_submit.c b/drivers/gpu/drm/xe/xe_guc_submit.c
index 373447758a60..db424133bc14 100644
--- a/drivers/gpu/drm/xe/xe_guc_submit.c
+++ b/drivers/gpu/drm/xe/xe_guc_submit.c
@@ -1548,6 +1548,41 @@ static int guc_exec_queue_set_preempt_timeout(struct xe_exec_queue *q,
 	return 0;
 }
 
+static int guc_exec_queue_no_preempt(struct xe_exec_queue *q, bool enable)
+{
+	struct xe_sched_msg *msg;
+
+	if (exec_queue_killed_or_banned_or_wedged(q))
+		return 0;
+
+	if (enable) {
+		if (!q->sched_props.preempt_timeout_us && !q->sched_props.timeslice_us)
+			return 0;
+	} else {
+		if (q->sched_props.preempt_timeout_us ==
+		    q->hwe->eclass->sched_props.preempt_timeout_us &&
+		    q->sched_props.timeslice_us == q->hwe->eclass->sched_props.timeslice_us)
+			return 0;
+	}
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	if (enable) {
+		/* Setting values to 0 will disable preemption and timeslicing */
+		q->sched_props.preempt_timeout_us = 0;
+		q->sched_props.timeslice_us = 0;
+	} else {
+		q->sched_props.preempt_timeout_us = q->hwe->eclass->sched_props.preempt_timeout_us;
+		q->sched_props.timeslice_us = q->hwe->eclass->sched_props.timeslice_us;
+	}
+
+	guc_exec_queue_add_msg(q, msg, SET_SCHED_PROPS);
+
+	return 0;
+}
+
 static int guc_exec_queue_suspend(struct xe_exec_queue *q)
 {
 	struct xe_sched_msg *msg = q->guc->static_msgs + STATIC_MSG_SUSPEND;
@@ -1598,6 +1633,7 @@ static const struct xe_exec_queue_ops guc_exec_queue_ops = {
 	.set_priority = guc_exec_queue_set_priority,
 	.set_timeslice = guc_exec_queue_set_timeslice,
 	.set_preempt_timeout = guc_exec_queue_set_preempt_timeout,
+	.no_preempt = guc_exec_queue_no_preempt,
 	.suspend = guc_exec_queue_suspend,
 	.suspend_wait = guc_exec_queue_suspend_wait,
 	.resume = guc_exec_queue_resume,
-- 
2.41.0