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coresight: sysfs: Validate CPU online status for per-CPU sources

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The current SysFS flow first enables the links and sink, then rolls back
to disable them if the source fails to enable. This failure can occur if
the associated CPU is offline, which causes the SMP call to fail.

Validate whether the associated CPU is online for a per-CPU tracer.
If the CPU is offline, return -ENODEV and bail out.

Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-28-f88c4a3ecfe9@arm.com
This commit is contained in:
Leo Yan 2026-05-15 21:08:35 +01:00 committed by Suzuki K Poulose
parent 7105d2aa76
commit a5dd853fb7
1 changed files with 3 additions and 0 deletions
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3
drivers/hwtracing/coresight/coresight-sysfs.c
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@ -168,6 +168,9 @@ static int coresight_validate_source_sysfs(struct coresight_device *csdev,
return -EINVAL;
}
if (coresight_is_percpu_source(csdev) && !cpu_online(csdev->cpu))
return -ENODEV;
return 0;
}