[Intel-xe] [PATCH V3 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/gtN/engines/ccs/job_timeout_ms

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_gt_sysfs.c | 42 ++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_gt_sysfs.c b/drivers/gpu/drm/xe/xe_gt_sysfs.c
index 5f534f325823..4b2ff4f796b4 100644
--- a/drivers/gpu/drm/xe/xe_gt_sysfs.c
+++ b/drivers/gpu/drm/xe/xe_gt_sysfs.c
@@ -34,6 +34,42 @@ static const struct kobj_type kobj_xe_engine_type = {
 	.sysfs_ops = &kobj_sysfs_ops
 };
 
+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 const struct attribute *files[] = {
+	&job_timeout_attr.attr,
+	NULL
+};
+
 static ssize_t job_timeout_default(struct kobject *kobj,
 				   struct kobj_attribute *attr, char *buf)
 {
@@ -190,6 +226,12 @@ int xe_gt_sysfs_engines(struct xe_gt *gt)
 				 err);
 			return err;
 		}
+
+		err = sysfs_create_files(&khwe->base, files);
+		if (err) {
+			kobject_put(kobj);
+			return err;
+		}
 	}
 
 	return err;
-- 
2.25.1