[Intel-xe] [PATCH V12 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

V8:
  - Rebase
V7:
  - Rebase to use s/xe_engine/xe_hw_engine/ - Matt
V6:
  - Remove timeout validation, not relevant - Niranjana
  - Rebase to use common error path
V5:
  - Rebase to use engine class interface instead of hw engine
V4:
  - Rebase to per class engine props interface
V3:
  - Rebase
  - Update commit message to reflect tile update
V2:
  - Use sysfs_create_files as part of this patch

Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
Reviewed-by: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Tejas Upadhyay <tejas.upadhyay at intel.com>
---
 drivers/gpu/drm/xe/xe_hw_engine_class_sysfs.c | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_hw_engine_class_sysfs.c b/drivers/gpu/drm/xe/xe_hw_engine_class_sysfs.c
index b1432660abad..82b01a702fe8 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine_class_sysfs.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine_class_sysfs.c
@@ -41,6 +41,34 @@ kobj_xe_hw_engine_class(struct kobject *parent, char *name)
 	return keclass;
 }
 
+static ssize_t job_timeout_store(struct kobject *kobj,
+				 struct kobj_attribute *attr,
+				 const char *buf, size_t count)
+{
+	struct xe_hw_engine_class_intf *eclass = kobj_to_eclass(kobj);
+	u32 timeout;
+	int err;
+
+	err = kstrtou32(buf, 0, &timeout);
+	if (err)
+		return err;
+
+	WRITE_ONCE(eclass->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_class_intf *eclass = kobj_to_eclass(kobj);
+
+	return sprintf(buf, "%u\n", eclass->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)
 {
@@ -82,6 +110,11 @@ static const struct attribute *defaults[] = {
 	NULL
 };
 
+static const struct attribute *files[] = {
+	&job_timeout_attr.attr,
+	NULL
+};
+
 static int xe_add_hw_engine_class_defaults(struct kobject *parent)
 {
 	struct kobject *kobj;
@@ -191,6 +224,10 @@ int xe_hw_engine_class_sysfs_init(struct xe_gt *gt)
 				 err);
 			goto err_object;
 		}
+
+		err = sysfs_create_files(&keclass->base, files);
+		if (err)
+			goto err_object;
 	}
 	return err;
 err_object:
-- 
2.25.1