linux-kernel - [PATCH 4/5] hwtracing: hisi_ptt: Don't try to attach a task

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Date:   Wed, 9 Aug 2023 16:18:24 +0800
From:   Yicong Yang <yangyicong@...wei.com>
To:     <jonathan.cameron@...wei.com>, <suzuki.poulose@....com>,
        <mathieu.poirier@...aro.org>, <linux-kernel@...r.kernel.org>
CC:     <alexander.shishkin@...ux.intel.com>, <helgaas@...nel.org>,
        <linux-pci@...r.kernel.org>, <prime.zeng@...ilicon.com>,
        <linuxarm@...wei.com>, <yangyicong@...ilicon.com>,
        <hejunhao3@...wei.com>
Subject: [PATCH 4/5] hwtracing: hisi_ptt: Don't try to attach a task

From: Yicong Yang <yangyicong@...ilicon.com>

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@...ilicon.com>
---
 drivers/hwtracing/ptt/hisi_ptt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index 3aba7bb6e548..916686c6a9c8 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -1003,6 +1003,9 @@ 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;
 
-- 
2.24.0