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coresight: etm4x: Set active path on target CPU

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Set the path pointer on the target CPU during ETM enable and disable.

This ensures the device mode and path pointer are updated together and
observed atomically by the CPU PM notifier.

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>
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-v14-20-f88c4a3ecfe9@arm.com
This commit is contained in:
Leo Yan 2026-05-15 21:08:27 +01:00 committed by Suzuki K Poulose
parent ac8eac9062
commit b6d54a94dc
1 changed files with 15 additions and 3 deletions
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18
drivers/hwtracing/coresight/coresight-etm4x-core.c
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@ -238,6 +238,7 @@ void etm4_release_trace_id(struct etmv4_drvdata *drvdata)
struct etm4_enable_arg {
struct etmv4_drvdata *drvdata;
struct coresight_path *path;
int rc;
};
@ -625,8 +626,12 @@ static void etm4_enable_sysfs_smp_call(void *info)
arg->rc = etm4_enable_hw(arg->drvdata);
/* The tracer didn't start */
if (arg->rc)
if (arg->rc) {
coresight_set_mode(csdev, CS_MODE_DISABLED);
return;
}
csdev->path = arg->path;
}
/*
@ -894,9 +899,13 @@ static int etm4_enable_perf(struct coresight_device *csdev,
out:
/* Failed to start tracer; roll back to DISABLED mode */
if (ret)
if (ret) {
coresight_set_mode(csdev, CS_MODE_DISABLED);
return ret;
return ret;
}
csdev->path = path;
return 0;
}
static int etm4_enable_sysfs(struct coresight_device *csdev, struct coresight_path *path)
@ -926,6 +935,7 @@ static int etm4_enable_sysfs(struct coresight_device *csdev, struct coresight_pa
* ensures that register writes occur when cpu is powered.
*/
arg.drvdata = drvdata;
arg.path = path;
ret = smp_call_function_single(drvdata->cpu,
etm4_enable_sysfs_smp_call, &arg, 1);
if (!ret)
@ -1067,6 +1077,7 @@ static void etm4_disable_sysfs_smp_call(void *info)
etm4_disable_hw(drvdata);
drvdata->csdev->path = NULL;
coresight_set_mode(drvdata->csdev, CS_MODE_DISABLED);
}
@ -1096,6 +1107,7 @@ static int etm4_disable_perf(struct coresight_device *csdev,
/* TRCVICTLR::SSSTATUS, bit[9] */
filters->ssstatus = (control & BIT(9));
drvdata->csdev->path = NULL;
coresight_set_mode(drvdata->csdev, CS_MODE_DISABLED);
/*