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

[ Upstream commit aff787f64ad7cbb54614b51b82c682fe06411ef3 ]

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 <yangyicong@hisilicon.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20231010084731.30450-5-yangyicong@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index dbed4fd..a991ecb 100644 (file)
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/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;