drm/amdkfd: add event_age tracking when receiving interrupt

[linux-2.6-microblaze.git] / drivers / gpu / drm / amd / amdkfd / kfd_events.c

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index ddca23e..d71ea06 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -431,6 +431,7 @@ int kfd_event_create(struct file *devkfd, struct kfd_process *p,
        if (!ret) {
                *event_id = ev->event_id;
                *event_trigger_data = ev->event_id;
+               ev->event_age = 1;
        } else {
                kfree(ev);
        }
@@ -629,6 +630,11 @@ static void set_event(struct kfd_event *ev)
         * updating the wait queues in kfd_wait_on_events.
         */
        ev->signaled = !ev->auto_reset || !waitqueue_active(&ev->wq);
+       if (!(++ev->event_age)) {
+               /* Never wrap back to reserved/default event age 0/1 */
+               ev->event_age = 2;
+               WARN_ONCE(1, "event_age wrap back!");
+       }
 
        list_for_each_entry(waiter, &ev->wq.head, wait.entry)
                WRITE_ONCE(waiter->activated, true);