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authorJunhao He <hejunhao3@huawei.com>2023-10-10 16:47:31 +0800
committerSuzuki K Poulose <suzuki.poulose@arm.com>2023-11-13 09:43:01 +0000
commit55e0a2fb0cb5ab7c9c99c1ad4d3e6954de8b73a0 (patch)
tree290afee22dbc0a8da4bedd53389f904a82a2a7f7 /drivers/hwtracing/ptt
parent287e82cf69aa264a52bc37591bd0eb407e20f85c (diff)
hwtracing: hisi_ptt: Add dummy callback pmu::read()
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. Fixes: ff0de066b463 ("hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device") Signed-off-by: Junhao He <hejunhao3@huawei.com> 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/20231010084731.30450-6-yangyicong@huawei.com
Diffstat (limited to 'drivers/hwtracing/ptt')
-rw-r--r--drivers/hwtracing/ptt/hisi_ptt.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index 49ea1b0f7489..3045d1894b81 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -1178,6 +1178,10 @@ 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);
@@ -1221,6 +1225,7 @@ 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);