static struct kobj_attribute stop_timeout_attr =
__ATTR(stop_timeout_ms, 0644, stop_show, stop_store);
+static ssize_t
+preempt_timeout_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct intel_engine_cs *engine = kobj_to_engine(kobj);
+ unsigned long long timeout;
+ int err;
+
+ /*
+ * After initialising a preemption request, we give the current
+ * resident a small amount of time to vacate the GPU. The preemption
+ * request is for a higher priority context and should be immediate to
+ * maintain high quality of service (and avoid priority inversion).
+ * However, the preemption granularity of the GPU can be quite coarse
+ * and so we need a compromise.
+ */
+
+ err = kstrtoull(buf, 0, &timeout);
+ if (err)
+ return err;
+
+ if (timeout > jiffies_to_msecs(MAX_SCHEDULE_TIMEOUT))
+ return -EINVAL;
+
+ WRITE_ONCE(engine->props.preempt_timeout_ms, timeout);
+
+ if (READ_ONCE(engine->execlists.pending[0]))
+ set_timer_ms(&engine->execlists.preempt, timeout);
+
+ return count;
+}
+
+static ssize_t
+preempt_timeout_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ struct intel_engine_cs *engine = kobj_to_engine(kobj);
+
+ return sprintf(buf, "%lu\n", engine->props.preempt_timeout_ms);
+}
+
+static struct kobj_attribute preempt_timeout_attr =
+__ATTR(preempt_timeout_ms, 0644, preempt_timeout_show, preempt_timeout_store);
+
static void kobj_engine_release(struct kobject *kobj)
{
kfree(kobj);
sysfs_create_file(kobj, ×lice_duration_attr.attr))
goto err_engine;
+ if (intel_engine_has_preempt_reset(engine) &&
+ sysfs_create_file(kobj, &preempt_timeout_attr.attr))
+ goto err_engine;
+
if (0) {
err_object:
kobject_put(kobj);