[PATCH v3 1/4] thermal: core: Add helpers to browse the cdev, tz and governor list

Daniel Lezcano
2020-07-03T08:53:29Z

The cdev, tz and governor list, as well as their respective locks are
statically defined in the thermal_core.c file.

In order to give a sane access to these list, like browsing all the
thermal zones or all the cooling devices, let's define a set of
helpers where we pass a callback as a parameter to be called for each
thermal entity.

We keep the self-encapsulation and ensure the locks are correctly
taken when looking at the list.

Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
drivers/thermal/thermal_core.c | 51 ++++++++++++++++++++++++++++++++++
drivers/thermal/thermal_core.h | 9 ++++++
2 files changed, 60 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index b71196eaf90e..9caaa0b6d662 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -617,6 +617,57 @@ void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz,
mutex_unlock(&thermal_list_lock);
}

+int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
+ void *data)
+{
+ struct thermal_governor *gov;
+ int ret = 0;
+
+ mutex_lock(&thermal_governor_lock);
+ list_for_each_entry(gov, &thermal_governor_list, governor_list) {
+ ret = cb(gov, data);
+ if (ret)
+ break;
+ }
+ mutex_unlock(&thermal_governor_lock);
+
+ return ret;
+}
+
+int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
+ void *), void *data)
+{
+ struct thermal_cooling_device *cdev;
+ int ret = 0;
+
+ mutex_lock(&thermal_list_lock);
+ list_for_each_entry(cdev, &thermal_cdev_list, node) {
+ ret = cb(cdev, data);
+ if (ret)
+ break;
+ }
+ mutex_unlock(&thermal_list_lock);
+
+ return ret;
+}
+
+int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
+ void *data)
+{
+ struct thermal_zone_device *tz;
+ int ret = 0;
+
+ mutex_lock(&thermal_list_lock);
+ list_for_each_entry(tz, &thermal_tz_list, node) {
+ ret = cb(tz, data);
+ if (ret)
+ break;
+ }
+ mutex_unlock(&thermal_list_lock);
+
+ return ret;
+}
+
void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,
const char *cdev_type, size_t size)
{
diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
index c95689586e19..71d88dac0791 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -41,6 +41,15 @@ extern struct thermal_governor *__governor_thermal_table_end[];
__governor < __governor_thermal_table_end; \
__governor++)

+int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
+ void *);
+
+int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
+ void *), void *);
+
+int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
+ void *thermal_governor);
+
struct thermal_attr {
struct device_attribute attr;
char name[THERMAL_NAME_LENGTH];
--
2.17.1