github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-29 02:31:27 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

coresight: Introduce coresight_enable_source() helper

Browse Source 
Introduce the coresight_enable_source() helper for enabling source
device.

Add validation to ensure the device is a source before proceeding with
further operations.

Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: James Clark <james.clark@linaro.org>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
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-v14-18-f88c4a3ecfe9@arm.com
This commit is contained in:
Leo Yan 2026-05-15 21:08:25 +01:00 committed by Suzuki K Poulose
parent 0724585ace
commit a18e877b04
4 changed files with 21 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/hwtracing/coresight/coresight-core.c
View File

@ -479,11 +479,25 @@ static void coresight_disable_helpers(struct coresight_device *csdev,
}
/*
* coresight_disable_source() only disables the source, but do nothing for
* the associated helpers, which are controlled as part of the path.
* coresight_enable_source() and coresight_disable_source() only enable and
* disable the source, but do nothing for the associated helpers, which are
* controlled as part of the path.
*/
int coresight_enable_source(struct coresight_device *csdev,
struct perf_event *event, enum cs_mode mode,
struct coresight_path *path)
{
if (!coresight_is_device_source(csdev))
return -EINVAL;
return source_ops(csdev)->enable(csdev, event, mode, path);
}
void coresight_disable_source(struct coresight_device *csdev, void *data)
{
if (!coresight_is_device_source(csdev))
return;
source_ops(csdev)->disable(csdev, data);
}
EXPORT_SYMBOL_GPL(coresight_disable_source);

2
drivers/hwtracing/coresight/coresight-etm-perf.c
View File

@ -593,7 +593,7 @@ static void etm_event_start(struct perf_event *event, int flags)
goto fail_end_stop;
/* Finally enable the tracer */
if (source_ops(source)->enable(source, event, CS_MODE_PERF, path))
if (coresight_enable_source(source, event, CS_MODE_PERF, path))
goto fail_disable_path;
/*

3
drivers/hwtracing/coresight/coresight-priv.h
View File

@ -251,6 +251,9 @@ struct coresight_device *coresight_get_percpu_sink(int cpu);
struct coresight_device *coresight_get_source(struct coresight_path *path);
struct coresight_device *coresight_get_percpu_source_ref(int cpu);
void coresight_put_percpu_source_ref(struct coresight_device *csdev);
int coresight_enable_source(struct coresight_device *csdev,
struct perf_event *event, enum cs_mode mode,
struct coresight_path *path);
void coresight_disable_source(struct coresight_device *csdev, void *data);
void coresight_pause_source(struct coresight_device *csdev);
int coresight_resume_source(struct coresight_device *csdev);

2
drivers/hwtracing/coresight/coresight-sysfs.c
View File

@ -66,7 +66,7 @@ static int coresight_enable_source_sysfs(struct coresight_device *csdev,
*/
lockdep_assert_held(&coresight_mutex);
if (coresight_get_mode(csdev) != CS_MODE_SYSFS) {
ret = source_ops(csdev)->enable(csdev, NULL, mode, path);
ret = coresight_enable_source(csdev, NULL, mode, path);
if (ret)
return ret;
}