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Message-ID: <20230809081825.11518-6-yangyicong@huawei.com>
Date: Wed, 9 Aug 2023 16:18:25 +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 5/5] hwtracing: hisi_ptt: Add dummy callback pmu::read()
From: Junhao He <hejunhao3@...wei.com>
When start trace with perf option "-C $cpu" and immediately stop it
with SIGTERM or others, the perf core will invoke pmu::read() while
the driver doesn't implement it. Add a dummy pmu::read() to avoid
any issues.
Signed-off-by: Junhao He <hejunhao3@...wei.com>
Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
---
drivers/hwtracing/ptt/hisi_ptt.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index 916686c6a9c8..7392e039b8c1 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -1184,6 +1184,10 @@ static void hisi_ptt_pmu_del(struct perf_event *event, int flags)
hisi_ptt_pmu_stop(event, PERF_EF_UPDATE);
}
+static void hisi_ptt_pmu_read(struct perf_event *event)
+{
+}
+
static void hisi_ptt_remove_cpuhp_instance(void *hotplug_node)
{
cpuhp_state_remove_instance_nocalls(hisi_ptt_pmu_online, hotplug_node);
@@ -1227,6 +1231,7 @@ static int hisi_ptt_register_pmu(struct hisi_ptt *hisi_ptt)
.stop = hisi_ptt_pmu_stop,
.add = hisi_ptt_pmu_add,
.del = hisi_ptt_pmu_del,
+ .read = hisi_ptt_pmu_read,
};
reg = readl(hisi_ptt->iobase + HISI_PTT_LOCATION);
--
2.24.0
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