hwtracing: hisi_ptt: Don't try to attach a task

PTT is an uncore PMU and shouldn't be attached to any task. Block
the usage in pmu::event_init().

Signed-off-by: Yicong Yang <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
Signed-off-by: Suzuki K Poulose <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Yicong Yang

drivers/hwtracing/ptt/hisi_ptt.c

@@ -1000,6 +1000,9 @@ static int hisi_ptt_pmu_event_init(struct perf_event *event)
 		return -EOPNOTSUPP;
 	}
 
+	if (event->attach_state & PERF_ATTACH_TASK)
+		return -EOPNOTSUPP;
+
 	if (event->attr.type != hisi_ptt->hisi_ptt_pmu.type)
 		return -ENOENT;