[PATCH v2 3/3] drm/amdkfd: don't sleep when event age unmatch

[James Zhu]

Don't sleep when event age unmatch, and update last_event_age.
It is only for KFD_EVENT_TYPE_SIGNAL which is checked by user space.

Signed-off-by: James Zhu <james....@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_events.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index c7689181cc22..f4ceb5be78ed 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -952,6 +952,21 @@ int kfd_wait_on_events(struct kfd_process *p,
                                        event_data.event_id);
                if (ret)
                        goto out_unlock;
+
+               /* last_event_age = 0 reserved for backward compatible */
+               if (event_data.signal_event_data.last_event_age &&
+                       event_waiters[i].event->event_age !=
+                               event_data.signal_event_data.last_event_age) {
+                       event_data.signal_event_data.last_event_age =
+                               event_waiters[i].event->event_age;
+                       WRITE_ONCE(event_waiters[i].activated, true);
+
+                       if (copy_to_user(&events[i], &event_data,
+                               sizeof(struct kfd_event_data))) {
+                               ret = -EFAULT;
+                               goto out_unlock;
+                       }
+               }
        }
 
        /* Check condition once. */
-- 
2.34.1