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| author | Leo Yan <leo.yan@arm.com> | 2026-05-15 23:08:26 +0300 |
|---|---|---|
| committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2026-05-18 12:18:46 +0300 |
| commit | ac8eac9062eefc33f5e97e526eef69bc98ecbdbc (patch) | |
| tree | 9b6687a600d6c23f3ba0c48b06c94ba4cb4eb128 /include | |
| parent | a18e877b0491ad21b24d6f1fe2afb854990e031d (diff) | |
| download | linux-ac8eac9062eefc33f5e97e526eef69bc98ecbdbc.tar.xz | |
coresight: Save active path for system tracers
This commit only set the path pointer for system tracers (e.g. STM) in
coresight_{enable|disable}_source().
Later changes will set the path pointer locally for per-CPU sources.
This is because the mode and path pointer must be set together, so that
they are observed atomically by the CPU PM notifier.
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-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-v14-19-f88c4a3ecfe9@arm.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/coresight.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 5f9d7ea9f594..58d474b26980 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -257,6 +257,7 @@ struct coresight_trace_id_map { * by @coresight_ops. * @access: Device i/o access abstraction for this device. * @dev: The device entity associated to this component. + * @path: Activated path pointer (only used for source device). * @mode: The device mode, i.e sysFS, Perf or disabled. This is actually * an 'enum cs_mode' but stored in an atomic type. Access is always * through atomic APIs, ensuring SMP-safe synchronisation between @@ -291,6 +292,7 @@ struct coresight_device { const struct coresight_ops *ops; struct csdev_access access; struct device dev; + struct coresight_path *path; atomic_t mode; int refcnt; int cpu; |