diff options
| author | Leo Yan <leo.yan@arm.com> | 2026-05-15 23:08:33 +0300 |
|---|---|---|
| committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2026-05-18 14:48:24 +0300 |
| commit | bf64b06ede93a8b56bf4dce0809e4edd111ccf36 (patch) | |
| tree | 43470852cfc6cd43378ef169086144c1d82d3e5e /include | |
| parent | da06d6eb523bdd20d063395d6cf7f4c873d338e8 (diff) | |
| download | linux-bf64b06ede93a8b56bf4dce0809e4edd111ccf36.tar.xz | |
coresight: sysfs: Increment refcount only for software source
Except for software sources (e.g. STM), other sources treat multiple
enables as equivalent to a single enable. The device mode already
tracks the binary state, so it is redundant to operate refcount.
Introduce a helper coresight_is_software_source() for check software
source. Refactor to maintain the refcount only for software sources.
This simplifies future CPU PM handling without refcount logic.
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-v14-26-f88c4a3ecfe9@arm.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/coresight.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 58d474b26980..76ef4c096512 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -611,6 +611,12 @@ static inline bool coresight_is_percpu_source(struct coresight_device *csdev) (csdev->subtype.source_subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_PROC); } +static inline bool coresight_is_software_source(struct coresight_device *csdev) +{ + return csdev && coresight_is_device_source(csdev) && + (csdev->subtype.source_subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE); +} + static inline bool coresight_is_percpu_sink(struct coresight_device *csdev) { return csdev && (csdev->type == CORESIGHT_DEV_TYPE_SINK) && |