linux-kernel - [PATCH AUTOSEL 6.1 02/29] hwtracing: hisi

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Message-ID: <20231211135457.381397-2-sashal@kernel.org>
Date:   Mon, 11 Dec 2023 08:53:46 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yicong Yang <yangyicong@...ilicon.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Sasha Levin <sashal@...nel.org>, jonathan.cameron@...wei.com,
        alexander.shishkin@...ux.intel.com
Subject: [PATCH AUTOSEL 6.1 02/29] hwtracing: hisi_ptt: Don't try to attach a task

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

[ 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@...ilicon.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Link: https://lore.kernel.org/r/20231010084731.30450-5-yangyicong@huawei.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 75a8f24fdafee..0a7190f2ba01d 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -659,6 +659,9 @@ 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;
 
-- 
2.42.0