From patchwork Tue Feb 5 10:46:17 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: durgadoss.r@intel.com X-Patchwork-Id: 2097451 X-Patchwork-Delegate: rui.zhang@intel.com Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 34E163FC23 for ; Tue, 5 Feb 2013 10:54:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754355Ab3BEKyA (ORCPT ); Tue, 5 Feb 2013 05:54:00 -0500 Received: from mga14.intel.com ([143.182.124.37]:3483 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754544Ab3BEKwE (ORCPT ); Tue, 5 Feb 2013 05:52:04 -0500 Received: from azsmga001.ch.intel.com ([10.2.17.19]) by azsmga102.ch.intel.com with ESMTP; 05 Feb 2013 02:52:04 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,602,1355126400"; d="scan'208";a="252768343" Received: from dr3-desktop.iind.intel.com ([10.223.107.127]) by azsmga001.ch.intel.com with ESMTP; 05 Feb 2013 02:52:01 -0800 From: Durgadoss R To: rui.zhang@intel.com, linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, eduardo.valentin@ti.com, hongbo.zhang@linaro.org, wni@nvidia.com, Durgadoss R Subject: [PATCH 2/8] Thermal: Create zone level APIs Date: Tue, 5 Feb 2013 16:16:17 +0530 Message-Id: <1360061183-14137-3-git-send-email-durgadoss.r@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1360061183-14137-1-git-send-email-durgadoss.r@intel.com> References: <1360061183-14137-1-git-send-email-durgadoss.r@intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@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_sys.c | 196 +++++++++++++++++++++++++++++++++++++++++ include/linux/thermal.h | 22 +++++ 2 files changed, 218 insertions(+) diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index cb94497..838d4fb 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -43,19 +43,46 @@ MODULE_DESCRIPTION("Generic thermal management sysfs support"); MODULE_LICENSE("GPL"); static DEFINE_IDR(thermal_tz_idr); +static DEFINE_IDR(thermal_zone_idr); static DEFINE_IDR(thermal_cdev_idr); static DEFINE_IDR(thermal_sensor_idr); static DEFINE_MUTEX(thermal_idr_lock); static LIST_HEAD(thermal_tz_list); static LIST_HEAD(thermal_sensor_list); +static LIST_HEAD(thermal_zone_list); static LIST_HEAD(thermal_cdev_list); static LIST_HEAD(thermal_governor_list); static DEFINE_MUTEX(thermal_list_lock); static DEFINE_MUTEX(sensor_list_lock); +static DEFINE_MUTEX(zone_list_lock); static DEFINE_MUTEX(thermal_governor_lock); +#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(&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); \ + } while (0); \ + ret; \ +}) + static struct thermal_governor *__find_governor(const char *name) { struct thermal_governor *pos; @@ -421,15 +448,44 @@ static void thermal_zone_device_check(struct work_struct *work) thermal_zone_device_update(tz); } +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)); + + /* 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--; +} + /* sys I/F for thermal zone */ #define to_thermal_zone(_dev) \ container_of(_dev, struct thermal_zone_device, device) +#define to_zone(_dev) \ + container_of(_dev, struct thermal_zone, device) + #define to_thermal_sensor(_dev) \ container_of(_dev, struct thermal_sensor, device) static ssize_t +zone_name_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct thermal_zone *tz = to_zone(dev); + + return sprintf(buf, "%s\n", tz->name); +} + +static ssize_t sensor_name_show(struct device *dev, struct device_attribute *attr, char *buf) { struct thermal_sensor *ts = to_thermal_sensor(dev); @@ -811,6 +867,8 @@ static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store); static DEVICE_ATTR(sensor_name, 0444, sensor_name_show, NULL); static DEVICE_ATTR(temp_input, 0444, sensor_temp_show, NULL); +static DEVICE_ATTR(zone_name, 0444, zone_name_show, NULL); + /* sys I/F for cooling device */ #define to_cooling_device(_dev) \ container_of(_dev, struct thermal_cooling_device, device) @@ -1656,6 +1714,136 @@ static int enable_sensor_thresholds(struct thermal_sensor *ts, int count) return 0; } +struct thermal_zone *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, &thermal_idr_lock, &tz->id); + if (ret) + goto exit_free; + + strcpy(tz->name, 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: + release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id); +exit_free: + kfree(tz); + return ERR_PTR(ret); +} +EXPORT_SYMBOL(create_thermal_zone); + +void remove_thermal_zone(struct thermal_zone *tz) +{ + struct thermal_zone *pos, *next; + 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; + + device_remove_file(&tz->device, &dev_attr_zone_name); + + release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id); + idr_destroy(&tz->idr); + + device_unregister(&tz->device); + kfree(tz); +exit: + mutex_unlock(&zone_list_lock); + return; +} +EXPORT_SYMBOL(remove_thermal_zone); + +struct thermal_sensor *get_sensor_by_name(const char *name) +{ + struct thermal_sensor *pos; + struct thermal_sensor *ts = NULL; + + mutex_lock(&sensor_list_lock); + for_each_thermal_sensor(pos) { + if (!strnicmp(pos->name, name, THERMAL_NAME_LENGTH)) { + ts = pos; + break; + } + } + mutex_unlock(&sensor_list_lock); + return ts; +} +EXPORT_SYMBOL(get_sensor_by_name); + +int 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; + } + + 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; + + tz->sensors[tz->sensor_indx++] = ts; + +exit_sensor: + mutex_unlock(&sensor_list_lock); +exit_zone: + mutex_unlock(&zone_list_lock); + return ret; +} +EXPORT_SYMBOL(add_sensor_to_zone); + /** * thermal_sensor_register - register a new thermal sensor * @name: name of the thermal sensor @@ -1732,6 +1920,7 @@ EXPORT_SYMBOL(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; @@ -1751,6 +1940,13 @@ 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) { diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 5470dae..2194519 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -55,6 +55,8 @@ #define DEFAULT_THERMAL_GOVERNOR "user_space" #endif +#define MAX_SENSORS_PER_ZONE 5 + struct thermal_sensor; struct thermal_zone_device; struct thermal_cooling_device; @@ -202,6 +204,21 @@ 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 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]; @@ -274,6 +291,11 @@ struct thermal_sensor *thermal_sensor_register(const char *, int, struct thermal_sensor_ops *, void *); void thermal_sensor_unregister(struct thermal_sensor *); +struct thermal_zone *create_thermal_zone(const char *, void *); +void remove_thermal_zone(struct thermal_zone *); +int add_sensor_to_zone(struct thermal_zone *, struct thermal_sensor *); +struct thermal_sensor *get_sensor_by_name(const char *); + #ifdef CONFIG_NET extern int thermal_generate_netlink_event(struct thermal_zone_device *tz, enum events event);