[Intel-xe] [PATCH V4 3/6] drm/xe: Add job timeout engine property to sysfs

[Tejas Upadhyay]

The time after which a job is removed from the scheduler.
Add sysfs entry to provide user defined job timeout to
scheduler.

The job timeout can be adjusted per-engine class using,

/sys/class/drm/cardX/device/tileN/gtN/engines/ccs/job_timeout_ms

V3:
  - Rebase
  - Update commit message to reflect tile update
V2:
  - Use sysfs_create_files as part of this patch

Signed-off-by: Tejas Upadhyay <tejas.upadhyay at intel.com>
---
 drivers/gpu/drm/xe/xe_engine_class_sysfs.c | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_engine_class_sysfs.c b/drivers/gpu/drm/xe/xe_engine_class_sysfs.c
index 7804cc27bd05..7f4ecef4ef81 100644
--- a/drivers/gpu/drm/xe/xe_engine_class_sysfs.c
+++ b/drivers/gpu/drm/xe/xe_engine_class_sysfs.c
@@ -39,6 +39,37 @@ kobj_xe_engine(struct kobject *parent, char *name)
 	return khwe;
 }
 
+static ssize_t job_timeout_store(struct kobject *kobj,
+				 struct kobj_attribute *attr,
+				 const char *buf, size_t count)
+{
+	struct xe_hw_engine *hwe = kobj_to_hwe(kobj);
+	u32 timeout;
+	int err;
+
+	err = kstrtou32(buf, 0, &timeout);
+	if (err)
+		return err;
+
+	if (timeout > jiffies_to_usecs(MAX_SCHEDULE_TIMEOUT))
+		return -EINVAL;
+
+	WRITE_ONCE(hwe->sched_props.job_timeout_ms, timeout);
+
+	return count;
+}
+
+static ssize_t job_timeout_show(struct kobject *kobj,
+				struct kobj_attribute *attr, char *buf)
+{
+	struct xe_hw_engine *hwe = kobj_to_hwe(kobj);
+
+	return sprintf(buf, "%u\n", hwe->sched_props.job_timeout_ms);
+}
+
+static struct kobj_attribute job_timeout_attr =
+__ATTR(job_timeout_ms, 0644, job_timeout_show, job_timeout_store);
+
 static ssize_t job_timeout_default(struct kobject *kobj,
 				   struct kobj_attribute *attr, char *buf)
 {
@@ -80,6 +111,11 @@ static const struct attribute *defaults[] = {
 	NULL
 };
 
+static const struct attribute *files[] = {
+	&job_timeout_attr.attr,
+	NULL
+};
+
 static int xe_add_engine_class_defaults(struct kobject *parent)
 {
 	struct kobject *kobj;
@@ -188,6 +224,12 @@ int xe_engine_class_sysfs_init(struct xe_gt *gt)
 			return err;
 		}
 
+		err = sysfs_create_files(&khwe->base, files);
+		if (err) {
+			kobject_put(kobj);
+			return err;
+		}
 	}
+
 	return err;
 }
-- 
2.25.1