This patch creates a structure to hold platform
thermal governor information, and provides APIs
for individual thermal governors to register/unregister
with the Thermal framework.
Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
---
drivers/thermal/thermal_sys.c | 90 +++++++++++++++++++++++++++++++++++++++++
include/linux/thermal.h | 16 ++++++++
2 files changed, 106 insertions(+)
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index a642d1c..541da47 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -49,7 +49,86 @@ static DEFINE_MUTEX(thermal_idr_lock);
static LIST_HEAD(thermal_tz_list);
static LIST_HEAD(thermal_cdev_list);
+static LIST_HEAD(thermal_governor_list);
+
static DEFINE_MUTEX(thermal_list_lock);
+static DEFINE_MUTEX(thermal_governor_lock);
+
+static struct thermal_governor *__find_governor(const char *name)
+{
+ struct thermal_governor *pos;
+
+ list_for_each_entry(pos, &thermal_governor_list, governor_list)
+ if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
+ return pos;
+
+ return NULL;
+}
+
+int thermal_register_governor(struct thermal_governor *governor)
+{
+ int err;
+ const char *name;
+ struct thermal_zone_device *pos;
+
+ if (!governor)
+ return -EINVAL;
+
+ mutex_lock(&thermal_governor_lock);
+
+ err = -EBUSY;
+ if (__find_governor(governor->name) == NULL) {
+ err = 0;
+ list_add(&governor->governor_list, &thermal_governor_list);
+ }
+
+ mutex_lock(&thermal_list_lock);
+
+ list_for_each_entry(pos, &thermal_tz_list, node) {
+ if (pos->governor)
+ continue;
+ if (pos->tzp)
+ name = pos->tzp->governor_name;
+ else
+ name = DEFAULT_THERMAL_GOVERNOR;
+ if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
+ pos->governor = governor;
+ }
+
+ mutex_unlock(&thermal_list_lock);
+ mutex_unlock(&thermal_governor_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(thermal_register_governor);
+
+void thermal_unregister_governor(struct thermal_governor *governor)
+{
+ struct thermal_zone_device *pos;
+
+ if (!governor)
+ return;
+
+ mutex_lock(&thermal_governor_lock);
+
+ if (__find_governor(governor->name) == NULL)
+ goto exit;
+
+ mutex_lock(&thermal_list_lock);
+
+ list_for_each_entry(pos, &thermal_tz_list, node) {
+ if (!strnicmp(pos->governor->name, governor->name,
+ THERMAL_NAME_LENGTH))
+ pos->governor = NULL;
+ }
+
+ mutex_unlock(&thermal_list_lock);
+ list_del(&governor->governor_list);
+exit:
+ mutex_unlock(&thermal_governor_lock);
+ return;
+}
+EXPORT_SYMBOL_GPL(thermal_unregister_governor);
static int get_idr(struct idr *idr, struct mutex *lock, int *id)
{
@@ -1439,6 +1518,16 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
if (result)
goto unregister;
+ /* Update 'this' zone's governor information */
+ mutex_lock(&thermal_governor_lock);
+
+ if (tz->tzp)
+ tz->governor = __find_governor(tz->tzp->governor_name);
+ else
+ tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
+
+ mutex_unlock(&thermal_governor_lock);
+
result = thermal_add_hwmon_sysfs(tz);
if (result)
goto unregister;
@@ -1502,6 +1591,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
if (tz->ops->get_mode)
device_remove_file(&tz->device, &dev_attr_mode);
remove_trip_attrs(tz);
+ tz->governor = NULL;
thermal_remove_hwmon_sysfs(tz);
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 58cb1c0..6182bd5 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -46,6 +46,9 @@
#define THERMAL_GENL_VERSION 0x01
#define THERMAL_GENL_MCAST_GROUP_NAME "thermal_mc_group"
+/* Default Thermal Governor: Does Linear Throttling */
+#define DEFAULT_THERMAL_GOVERNOR "step_wise"
+
struct thermal_zone_device;
struct thermal_cooling_device;
@@ -158,6 +161,7 @@ struct thermal_zone_device {
unsigned int forced_passive;
const struct thermal_zone_device_ops *ops;
const struct thermal_zone_params *tzp;
+ struct thermal_governor *governor;
struct list_head thermal_instances;
struct idr idr;
struct mutex lock; /* protect thermal_instances list */
@@ -165,6 +169,14 @@ struct thermal_zone_device {
struct delayed_work poll_queue;
};
+/* Structure that holds thermal governor information */
+struct thermal_governor {
+ char name[THERMAL_NAME_LENGTH];
+ int (*throttle)(struct thermal_zone_device *tz, int trip);
+ struct list_head governor_list;
+ struct module *owner;
+};
+
/* Structure that holds binding parameters for a zone */
struct thermal_bind_params {
struct thermal_cooling_device *cdev;
@@ -189,6 +201,7 @@ struct thermal_bind_params {
/* Structure to define Thermal Zone parameters */
struct thermal_zone_params {
+ char governor_name[THERMAL_NAME_LENGTH];
int num_tbps; /* Number of tbp entries */
struct thermal_bind_params *tbp;
};
@@ -219,6 +232,9 @@ int get_tz_trend(struct thermal_zone_device *, int);
struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
struct thermal_cooling_device *, int);
+int thermal_register_governor(struct thermal_governor *);
+void thermal_unregister_governor(struct thermal_governor *);
+
#ifdef CONFIG_NET
extern int thermal_generate_netlink_event(u32 orig, enum events event);
#else
--
1.7.9.5
--
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