SWDEV-445864: SWDEV-445865: Update page migration events (#16)

* Update kfd ioctl header

- Adds new event for dropped events
- Mirrors kernel update by Philip Yang

* Add error code for page migration events

- Adds support for new error code field for page migration end events
  - Page migration end event is now generated for migration failure
  - Error code is zero for successful migration

* Add dropped event SMI event

- New event type indicates if events were dropped
  - Events are dropped if the buffer is full

tests/page-migration/validate.py

@@ -300,7 +300,7 @@ def test_page_migration_data(input_data):
     for op_name in bf_op_names:
         assert "PAGE_MIGRATION" in op_name
 
-    assert len(bf_op_names) == 8
+    assert len(bf_op_names) == 9
 
     nodes = set(x.id.handle for x in sdk_data.agents)
     allocations = get_allocated_pages(callback_records)
@@ -379,6 +379,11 @@ def test_page_migration_data(input_data):
                 validate_node(arg.agent_id, nodes)
                 assert 0 <= arg.trigger < 3
 
+            if "dropped_event" in r:
+                arg = r.dropped_event
+                # We shouldn't get any dropped events. If we do, our test needs to be redesigned.
+                assert arg.dropped_events_count == 0
+
 
 if __name__ == "__main__":
     exit_code = pytest.main(["-x", __file__] + sys.argv[1:])