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linux/drivers/hwtracing
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Junhao He 672976c28e hwtracing: hisi_ptt: Add dummy callback pmu::read() 
[ Upstream commit 55e0a2fb0c ]

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: ff0de066b4 ("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>
History 2023-12-13 18:39:22 +01:00
..
coresight coresight: etm4x: Remove bogous __exit annotation for some functions 2023-12-13 18:39:22 +01:00
intel_th intel_th: pci: Add Raptor Lake-S CPU support 2022-07-08 15:43:15 +02:00
ptt hwtracing: hisi_ptt: Add dummy callback pmu::read() 2023-12-13 18:39:22 +01:00
stm stm class: Use correct UUID APIs 2021-04-16 07:26:50 +02:00
Kconfig hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device 2022-09-08 16:26:17 -06:00