drm/amdkfd: Improve signal event slow path

If event slot is not signaled, kfd_signal_event_interrupt goes to slow
path to scan all event slots to find the signaled event, this is needed
for old ASICs that don't have the event ID or the event IDs are
incorrect in the IH payload.

There is case that GPU signal the same event twice, then driver process
the first event interrupt, set_event and event slot is auto-reset, then
for the second event interrupt, KFD goes to slow path as event is not
signaled, just drop the second event interrupt because the application
only need wakeup once.

Signed-off-by: Philip Yang <[e-mail]>
Reviewed-by: Felix Kuehling <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdkfd/kfd_events.c

···
 		uint64_t *slots = page_slots(p->signal_page);
 		uint32_t id;
 
+		/*
+		 * If id is valid but slot is not signaled, GPU may signal the same event twice
+		 * before driver have chance to process the first interrupt, then signal slot is
+		 * auto-reset after set_event wakeup the user space, just drop the second event as
+		 * the application only need wakeup once.
+		 */
+		if ((valid_id_bits > 31 || (1U << valid_id_bits) >= KFD_SIGNAL_EVENT_LIMIT) &&
+		    partial_id < KFD_SIGNAL_EVENT_LIMIT && slots[partial_id] == UNSIGNALED_EVENT_SLOT)
+			goto out_unlock;
+
 		if (valid_id_bits)
 			pr_debug_ratelimited("Partial ID invalid: %u (%u valid bits)\n",
 					     partial_id, valid_id_bits);
···
 		}
 	}
 
+out_unlock:
 	rcu_read_unlock();
 	kfd_unref_process(p);
 }