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| author | Junhao He <hejunhao3@huawei.com> | 2023-10-10 16:47:31 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-13 18:45:28 +0100 |
| commit | 359d3fbcbc099430ca3f35a696e298e9c2d9e9ba (patch) | |
| tree | 4126caba97ae681fb684756889686de23d483d3b /drivers/hwtracing | |
| parent | 2f6b1527db82d959639be1f55db4069a869b71db (diff) | |
| download | linux-stable-359d3fbcbc099430ca3f35a696e298e9c2d9e9ba.tar.gz linux-stable-359d3fbcbc099430ca3f35a696e298e9c2d9e9ba.tar.bz2 linux-stable-359d3fbcbc099430ca3f35a696e298e9c2d9e9ba.zip | |
hwtracing: hisi_ptt: Add dummy callback pmu::read()
[ Upstream commit 55e0a2fb0cb5ab7c9c99c1ad4d3e6954de8b73a0 ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/ptt/hisi_ptt.c | 5 |
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); |