Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752020AbaAPSbF (ORCPT ); Thu, 16 Jan 2014 13:31:05 -0500 Received: from mga14.intel.com ([143.182.124.37]:6313 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751642AbaAPS2m (ORCPT ); Thu, 16 Jan 2014 13:28:42 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.95,668,1384329600"; d="scan'208";a="404034947" From: Durgadoss R To: rui.zhang@intel.com, eduardo.valentin@ti.com, linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, hongbo.zhang@freescale.com, wni@nvidia.com, Durgadoss R Subject: [PATCHv5 04/10] Thermal: Create zone level APIs Date: Fri, 17 Jan 2014 05:26:21 +0530 Message-Id: <1389916587-2541-5-git-send-email-durgadoss.r@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1389916587-2541-1-git-send-email-durgadoss.r@intel.com> References: <1389916587-2541-1-git-send-email-durgadoss.r@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds a new thermal_zone structure to thermal.h. Also, adds zone level APIs to the thermal framework. A thermal zone is a hot spot on the platform, which can have one or more sensors and cooling devices attached to it. These sensors can be mapped to a set of cooling devices, which when throttled, can help to bring down the temperature of the hot spot. Signed-off-by: Durgadoss R --- drivers/thermal/thermal_core_new.c | 268 ++++++++++++++++++++++++++++++++++++ include/linux/thermal.h | 23 ++++ 2 files changed, 291 insertions(+) diff --git a/drivers/thermal/thermal_core_new.c b/drivers/thermal/thermal_core_new.c index ba38438..4f84cb5 100644 --- a/drivers/thermal/thermal_core_new.c +++ b/drivers/thermal/thermal_core_new.c @@ -40,13 +40,16 @@ MODULE_LICENSE("GPL v2"); static DEFINE_IDR(thermal_sensor_idr); static DEFINE_IDR(thermal_cdev_idr); +static DEFINE_IDR(thermal_zone_idr); static LIST_HEAD(thermal_sensor_list); static LIST_HEAD(thermal_cdev_list); +static LIST_HEAD(thermal_zone_list); static DEFINE_MUTEX(thermal_idr_lock); static DEFINE_MUTEX(sensor_list_lock); static DEFINE_MUTEX(cdev_list_lock); +static DEFINE_MUTEX(zone_list_lock); #define to_thermal_sensor(_dev) \ container_of(_dev, struct thermal_sensor, device) @@ -54,6 +57,35 @@ static DEFINE_MUTEX(cdev_list_lock); #define to_cooling_device(_dev) \ container_of(_dev, struct thermal_cooling_device, device) +#define to_thermal_zone(_dev) \ + container_of(_dev, struct thermal_zone, device) + +#define for_each_thermal_sensor(pos) \ + list_for_each_entry(pos, &thermal_sensor_list, node) + +#define for_each_thermal_zone(pos) \ + list_for_each_entry(pos, &thermal_zone_list, node) + +#define GET_INDEX(tz, ptr, type) \ +({ \ + int i, ret = -EINVAL; \ + do { \ + if (!tz || !ptr) \ + break; \ + mutex_lock(&tz->lock); \ + mutex_lock(&type##_list_lock); \ + for (i = 0; i < tz->type##_indx; i++) { \ + if (tz->type##s[i] == ptr) { \ + ret = i; \ + break; \ + } \ + } \ + mutex_unlock(&type##_list_lock); \ + mutex_unlock(&tz->lock); \ + } while (0); \ + ret; \ +}) + static int get_idr(struct idr *idr, int *id) { int ret; @@ -228,6 +260,14 @@ cur_state_store(struct device *dev, struct device_attribute *attr, return ret ? ret : count; } +static ssize_t +zone_name_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct thermal_zone *tz = to_thermal_zone(dev); + + return sprintf(buf, "%s\n", tz->name); +} + /* Thermal sensor attributes */ static DEVICE_ATTR_RO(name); static DEVICE_ATTR_RO(temp); @@ -237,6 +277,30 @@ static DEVICE_ATTR_RO(type); static DEVICE_ATTR_RO(max_state); static DEVICE_ATTR_RW(cur_state); +/* Thermal zone attributes */ +static DEVICE_ATTR_RO(zone_name); + +static void remove_sensor_from_zone(struct thermal_zone *tz, + struct thermal_sensor *ts) +{ + int j, indx; + + indx = GET_INDEX(tz, ts, sensor); + if (indx < 0) + return; + + sysfs_remove_link(&tz->device.kobj, kobject_name(&ts->device.kobj)); + + mutex_lock(&tz->lock); + + /* Shift the entries in the tz->sensors array */ + for (j = indx; j < MAX_SENSORS_PER_ZONE - 1; j++) + tz->sensors[j] = tz->sensors[j + 1]; + + tz->sensor_indx--; + mutex_unlock(&tz->lock); +} + /** * thermal_create_sensor_sysfs - create sysfs nodes for sensorX * @ts: the thermal sensor @@ -391,6 +455,7 @@ EXPORT_SYMBOL_GPL(thermal_sensor_register); void thermal_sensor_unregister(struct thermal_sensor *ts) { int i; + struct thermal_zone *tz; struct thermal_sensor *pos, *next; bool found = false; @@ -410,6 +475,13 @@ void thermal_sensor_unregister(struct thermal_sensor *ts) if (!found) return; + mutex_lock(&zone_list_lock); + + for_each_thermal_zone(tz) + remove_sensor_from_zone(tz, ts); + + mutex_unlock(&zone_list_lock); + for (i = 0; i < ts->thresholds; i++) { device_remove_file(&ts->device, &ts->thresh_attrs[i].attr); if (ts->ops->get_hyst) { @@ -549,3 +621,199 @@ void thermal_cdev_unregister(struct thermal_cooling_device *cdev) return; } EXPORT_SYMBOL_GPL(thermal_cdev_unregister); + +/** + * thermal_create_thermal_zone - create sysfs nodes for thermal zone + * @name: Name of the thermla zone + * @devdata: Data supplied by the caller + * + * On Success returns a thermal zone reference, otherwise: + * -EINVAL for invalid parameters, + * -ENOMEM for insufficient memory cases, + */ +struct thermal_zone *thermal_create_thermal_zone(const char *name, + void *devdata) +{ + struct thermal_zone *tz; + int ret; + + if (!name || (name && strlen(name) >= THERMAL_NAME_LENGTH)) + return ERR_PTR(-EINVAL); + + tz = kzalloc(sizeof(*tz), GFP_KERNEL); + if (!tz) + return ERR_PTR(-ENOMEM); + + idr_init(&tz->idr); + ret = get_idr(&thermal_zone_idr, &tz->id); + if (ret) + goto exit_free; + + mutex_init(&tz->lock); + strlcpy(tz->name, name, sizeof(tz->name)); + tz->devdata = devdata; + tz->device.class = &thermal_class; + + dev_set_name(&tz->device, "zone%d", tz->id); + ret = device_register(&tz->device); + if (ret) + goto exit_idr; + + ret = device_create_file(&tz->device, &dev_attr_zone_name); + if (ret) + goto exit_unregister; + + /* Add this zone to the global list of thermal zones */ + mutex_lock(&zone_list_lock); + list_add_tail(&tz->node, &thermal_zone_list); + mutex_unlock(&zone_list_lock); + return tz; + +exit_unregister: + device_unregister(&tz->device); +exit_idr: + mutex_destroy(&tz->lock); + release_idr(&thermal_zone_idr, tz->id); +exit_free: + kfree(tz); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(thermal_create_thermal_zone); + +/** + * thermal_remove_thermal_zone - removes the sysfs nodes for given tz + * @tz: Thermal zone to be removed. + */ +void thermal_remove_thermal_zone(struct thermal_zone *tz) +{ + struct thermal_zone *pos, *next; + struct thermal_sensor *ts; + bool found = false; + + if (!tz) + return; + + mutex_lock(&zone_list_lock); + + list_for_each_entry_safe(pos, next, &thermal_zone_list, node) { + if (pos == tz) { + list_del(&tz->node); + found = true; + break; + } + } + + if (!found) + goto exit; + + for_each_thermal_sensor(ts) + remove_sensor_from_zone(tz, ts); + + device_remove_file(&tz->device, &dev_attr_zone_name); + + mutex_destroy(&tz->lock); + release_idr(&thermal_zone_idr, tz->id); + idr_destroy(&tz->idr); + + device_unregister(&tz->device); + kfree(tz); +exit: + mutex_unlock(&zone_list_lock); + return; +} +EXPORT_SYMBOL_GPL(thermal_remove_thermal_zone); + +/** + * thermal_get_sensor_by_name() - search for a sensor and return its reference + * @name: thermal sensor name to fetch the reference + * + * On success returns a reference to a unique sensor with + * name matching that of @name, an ERR_PTR otherwise: + * -EINVAL for invalid paramenters + * -ENODEV for sensor not found + * -EEXIST for multiple matches + */ +struct thermal_sensor *thermal_get_sensor_by_name(const char *name) +{ + int found = 0; + struct thermal_sensor *pos; + struct thermal_sensor *ts = ERR_PTR(-EINVAL); + + if (!name) + return ts; + + mutex_lock(&sensor_list_lock); + for_each_thermal_sensor(pos) { + if (!strnicmp(pos->name, name, THERMAL_NAME_LENGTH)) { + found++; + ts = pos; + } + } + mutex_unlock(&sensor_list_lock); + + if (found == 0) + ts = ERR_PTR(-ENODEV); + else if (found > 1) + ts = ERR_PTR(-EEXIST); + + return ts; +} +EXPORT_SYMBOL_GPL(thermal_get_sensor_by_name); + +/** + * thermal_add_sensor_to_zone - Add @ts to thermal zone @tz + * @tz: Thermal zone reference + * @ts: Thermal sensor reference + * + * Returns 0 on success, otherwise + * -EINVAL for invalid paramenters + * -EINVAL when trying to add more zones than MAX_SENSORS_PER_ZONE + * -EEXIST when trying add existing thermal sensor again + */ +int thermal_add_sensor_to_zone(struct thermal_zone *tz, + struct thermal_sensor *ts) +{ + int ret; + + if (!tz || !ts) + return -EINVAL; + + mutex_lock(&zone_list_lock); + + /* Ensure we are not adding the same sensor again!! */ + ret = GET_INDEX(tz, ts, sensor); + if (ret >= 0) { + ret = -EEXIST; + goto exit_zone; + } + + /* Protect against 'ts' being unregistered */ + mutex_lock(&sensor_list_lock); + + ret = sysfs_create_link(&tz->device.kobj, &ts->device.kobj, + kobject_name(&ts->device.kobj)); + if (ret) + goto exit_sensor; + + mutex_lock(&tz->lock); + + if (tz->sensor_indx >= MAX_SENSORS_PER_ZONE - 1) { + dev_err(&tz->device, "Only %d sensors allowed per zone\n", + MAX_SENSORS_PER_ZONE); + sysfs_remove_link(&tz->device.kobj, + kobject_name(&ts->device.kobj)); + ret = -EINVAL; + goto exit_indx_check; + } + + tz->sensors[tz->sensor_indx++] = ts; + +exit_indx_check: + mutex_unlock(&tz->lock); +exit_sensor: + mutex_unlock(&sensor_list_lock); +exit_zone: + mutex_unlock(&zone_list_lock); + return ret; +} +EXPORT_SYMBOL_GPL(thermal_add_sensor_to_zone); diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 46d7dc3..2afc483 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -59,6 +59,8 @@ #define DEFAULT_THERMAL_GOVERNOR "user_space" #endif +#define MAX_SENSORS_PER_ZONE 5 + struct thermal_sensor; struct thermal_zone_device; struct thermal_cooling_device; @@ -210,6 +212,22 @@ struct thermal_zone_device { struct delayed_work poll_queue; }; +struct thermal_zone { + char name[THERMAL_NAME_LENGTH]; + int id; + void *devdata; + struct thermal_zone *ops; + struct thermal_governor *governor; + struct idr idr; + struct mutex lock; /* protect elements of this structure */ + struct device device; + struct list_head node; + + /* Sensor level information */ + int sensor_indx; /* index into 'sensors' array */ + struct thermal_sensor *sensors[MAX_SENSORS_PER_ZONE]; +}; + /* Structure that holds thermal governor information */ struct thermal_governor { char name[THERMAL_NAME_LENGTH]; @@ -320,6 +338,11 @@ struct thermal_instance *get_thermal_instance(struct thermal_zone_device *, void thermal_cdev_update(struct thermal_cooling_device *); void thermal_notify_framework(struct thermal_zone_device *, int); +struct thermal_zone *thermal_create_thermal_zone(const char *, void *); +void thermal_remove_thermal_zone(struct thermal_zone *); +int thermal_add_sensor_to_zone(struct thermal_zone *, struct thermal_sensor *); +struct thermal_sensor *thermal_get_sensor_by_name(const char *); + #ifdef CONFIG_NET extern int thermal_generate_netlink_event(struct thermal_zone_device *tz, enum events event); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/