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Date: Mon, 5 Jun 2017 17:07:24 +0800
From: Tao Wang <kevin.wangtao@...ilicon.com>
To: <rui.zhang@...el.com>, <edubezval@...il.com>,
<amit.kachhap@...il.com>, <viresh.kumar@...aro.org>,
<javi.merino@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
<sunzhaosheng@...ilicon.com>, <vincent.guittot@...aro.org>,
<jean.wangtao@...aro.org>, Tao Wang <kevin.wangtao@...ilicon.com>
Subject: [PATCH RFC 1/2] thermal/cpu idle cooling: Introduce cpu idle cooling driver
cpu idle cooling driver performs synchronized idle injection across
all cpu in same cluster, offers a new method to cooling down cpu,
that is similar to intel_power_clamp driver, but is basically
designed for ARM platform.
Each cluster has its own idle cooling device, each core has its own
idle injection thread, idle injection thread use play_idle to enter
idle. In order to reach deepest idle state, all cores are aligned by
jiffies. the injected idle ratio can be controlled through cooling
device interface.
Signed-off-by: Tao Wang <kevin.wangtao@...ilicon.com>
---
drivers/thermal/Kconfig | 13 +
drivers/thermal/Makefile | 3 +
drivers/thermal/cpu_idle_cooling.c | 648 ++++++++++++++++++++++++++++++++++++
3 files changed, 664 insertions(+)
create mode 100644 drivers/thermal/cpu_idle_cooling.c
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index b5b5fac..f78e85c 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -154,6 +154,19 @@ config CPU_THERMAL
If you want this support, you should say Y here.
+config CPU_IDLE_THERMAL
+ tristate "generic cpu idle cooling support"
+ depends on CPU_FREQ
+ help
+ This implements the generic cpu cooling mechanism through idle
+ injection.
+
+ This will throttle cpu by injecting specified idle time in
+ a fixed cycle. All cpu in same cluster will enter idle synchronously
+ to reach deepest idle state when injecting idle.
+
+ If you want this support, you should say Y here.
+
config CLOCK_THERMAL
bool "Generic clock cooling support"
depends on COMMON_CLK
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 094d703..a4db66e 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -26,6 +26,9 @@ thermal_sys-$(CONFIG_CLOCK_THERMAL) += clock_cooling.o
# devfreq cooling
thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
+# cpu idle cooling
+obj-$(CONFIG_CPU_IDLE_THERMAL) += cpu_idle_cooling.o
+
# platform thermal drivers
obj-y += broadcom/
obj-$(CONFIG_QCOM_SPMI_TEMP_ALARM) += qcom-spmi-temp-alarm.o
diff --git a/drivers/thermal/cpu_idle_cooling.c b/drivers/thermal/cpu_idle_cooling.c
new file mode 100644
index 0000000..89a15c5
--- /dev/null
+++ b/drivers/thermal/cpu_idle_cooling.c
@@ -0,0 +1,648 @@
+/*
+ * linux/drivers/thermal/cpu_idle_cooling.c
+ *
+ * Copyright (C) 2017 Tao Wang <kevin.wangtao@...ilicon.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/kernel_stat.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/cpu.h>
+#include <linux/topology.h>
+#include <linux/cpufreq.h>
+#include <linux/cpumask.h>
+#include <linux/cpuidle.h>
+#include <linux/thermal.h>
+#include <linux/sched.h>
+#include <uapi/linux/sched/types.h>
+#include <linux/slab.h>
+#include <linux/tick.h>
+#include <linux/wait.h>
+#include <linux/sched/rt.h>
+
+#define MAX_TARGET_RATIO (50U)
+
+#define DEFAULT_WINDOW_SIZE (1)
+#define DEFAULT_DURATION_JIFFIES (20)
+
+struct cpu_idle_cooling_device {
+ int id;
+ struct thermal_cooling_device *cooling_dev;
+ wait_queue_head_t wait_queue;
+
+ /* The cpu assigned to collect stat and update
+ * control parameters. default to BSP but BSP
+ * can be offlined.
+ */
+ unsigned long control_cpu;
+
+ unsigned int set_target_ratio;
+ unsigned int current_ratio;
+ unsigned int control_ratio;
+ unsigned int duration;
+ unsigned int window_size;
+
+ cpumask_var_t related_cpus;
+ cpumask_var_t injected_cpus;
+ struct list_head node;
+ bool should_skip;
+ bool clamping;
+};
+
+static LIST_HEAD(cpu_idle_cooling_dev_list);
+static DEFINE_PER_CPU(struct task_struct *, idle_injection_thread_ptr);
+static DEFINE_MUTEX(cpu_idle_cooling_lock);
+
+unsigned long idle_time[NR_CPUS] = {0};
+unsigned long time_stamp[NR_CPUS] = {0};
+static enum cpuhp_state hp_state;
+
+#define STORE_PARAM(param, min, max) \
+static ssize_t store_##param(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ unsigned int new_value; \
+ struct thermal_cooling_device *cdev; \
+ struct cpu_idle_cooling_device *idle_cooling_dev; \
+ \
+ if (dev == NULL || attr == NULL) \
+ return 0; \
+ \
+ if (kstrtouint(buf, 10, &new_value)) \
+ return -EINVAL; \
+ \
+ if (new_value > max || new_value < min) { \
+ pr_err("Out of range %u, between %d-%d\n", \
+ new_value, min, max); \
+ return -EINVAL; \
+ } \
+ \
+ cdev = container_of(dev, struct thermal_cooling_device, device);\
+ idle_cooling_dev = cdev->devdata; \
+ idle_cooling_dev->param = new_value; \
+ \
+ /* make new value visible to other cpus */ \
+ smp_mb(); \
+ \
+ return count; \
+}
+
+STORE_PARAM(duration, 10, 500);
+STORE_PARAM(window_size, 1, 10);
+
+#define SHOW_PARAM(param) \
+static ssize_t show_##param(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct thermal_cooling_device *cdev; \
+ struct cpu_idle_cooling_device *idle_cooling_dev; \
+ \
+ if (dev == NULL || attr == NULL) \
+ return 0; \
+ \
+ cdev = container_of(dev, struct thermal_cooling_device, device);\
+ idle_cooling_dev = cdev->devdata; \
+ \
+ return snprintf(buf, 12UL, "%d\n", \
+ idle_cooling_dev->param); \
+}
+
+SHOW_PARAM(duration);
+SHOW_PARAM(window_size);
+
+static DEVICE_ATTR(duration, 0644, show_duration, store_duration);
+static DEVICE_ATTR(window_size, 0644, show_window_size, store_window_size);
+
+static struct cpu_idle_cooling_device *
+get_cpu_idle_cooling_dev(unsigned long cpu)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev;
+
+ list_for_each_entry(idle_cooling_dev,
+ &cpu_idle_cooling_dev_list, node) {
+ if (cpumask_test_cpu(cpu, idle_cooling_dev->related_cpus))
+ return idle_cooling_dev;
+ }
+
+ return NULL;
+}
+
+#define K_P 10
+#define MAX_COMP 10
+static unsigned int get_compensation(unsigned int current_ratio,
+ unsigned int target_ratio, unsigned int control_ratio)
+{
+ unsigned int comp;
+
+ comp = abs(current_ratio - target_ratio) * K_P / 10;
+ if (comp > MAX_COMP)
+ comp = MAX_COMP;
+
+ if (current_ratio > target_ratio) {
+ if (control_ratio > comp)
+ comp = control_ratio - comp;
+ else
+ comp = 1;
+ } else {
+ if (control_ratio + comp < MAX_TARGET_RATIO)
+ comp = control_ratio + comp;
+ else
+ comp = MAX_TARGET_RATIO;
+
+ if (comp > (target_ratio * 6 / 5))
+ comp = target_ratio * 6 / 5;
+ }
+
+ return comp;
+}
+
+static void update_stats(struct cpu_idle_cooling_device *idle_cooling_dev)
+{
+ unsigned long cpu;
+ u64 now, now_idle, delta_time, delta_idle;
+ u64 min_idle_ratio = 100;
+ u64 idle_ratio = 0;
+
+ for_each_cpu(cpu, idle_cooling_dev->related_cpus) {
+ now_idle = get_cpu_idle_time(cpu, &now, 0);
+ delta_idle = now_idle - idle_time[cpu];
+ delta_time = now - time_stamp[cpu];
+ idle_time[cpu] = now_idle;
+ time_stamp[cpu] = now;
+
+ if (delta_idle >= delta_time || !cpu_online(cpu))
+ now_idle = 100;
+ else if (delta_time)
+ now_idle = div64_u64(100 * delta_idle, delta_time);
+ else
+ return;
+
+ if (now_idle < min_idle_ratio)
+ min_idle_ratio = now_idle;
+
+ idle_ratio += now_idle;
+ }
+
+ idle_ratio /= cpumask_weight(idle_cooling_dev->related_cpus);
+ if (idle_ratio > MAX_TARGET_RATIO)
+ idle_ratio = min_idle_ratio;
+
+ if (idle_cooling_dev->should_skip)
+ idle_ratio = (idle_cooling_dev->current_ratio + idle_ratio) / 2;
+
+ idle_cooling_dev->current_ratio = (unsigned int)idle_ratio;
+ idle_cooling_dev->control_ratio = get_compensation(idle_ratio,
+ idle_cooling_dev->set_target_ratio,
+ idle_cooling_dev->control_ratio);
+ idle_cooling_dev->should_skip =
+ (idle_ratio > (2 * idle_cooling_dev->set_target_ratio));
+ /* make new control_ratio and should skip flag visible to other cpus */
+ smp_mb();
+}
+
+static void inject_idle_fn(struct cpu_idle_cooling_device *idle_cooling_dev)
+{
+ long sleeptime, guard;
+ unsigned int interval_ms; /* jiffies to sleep for each attempt */
+ unsigned long target_jiffies;
+ unsigned int duration_ms = idle_cooling_dev->duration;
+ unsigned long duration_jiffies = msecs_to_jiffies(duration_ms);
+
+ guard = DIV_ROUND_UP(duration_jiffies * (90 - MAX_TARGET_RATIO), 100);
+
+ /* align idle time */
+ target_jiffies = roundup(jiffies, duration_jiffies);
+ sleeptime = target_jiffies - jiffies;
+ if (sleeptime < guard)
+ sleeptime += duration_jiffies;
+
+ if (sleeptime > 0)
+ schedule_timeout_interruptible(sleeptime);
+
+ interval_ms = duration_ms * idle_cooling_dev->control_ratio / 100;
+
+ if (idle_cooling_dev->should_skip)
+ return;
+
+ if (interval_ms)
+ play_idle(interval_ms);
+}
+
+static int idle_injection_thread(void *arg)
+{
+ unsigned long cpunr = (unsigned long)arg;
+ struct sched_param param = { .sched_priority = MAX_USER_RT_PRIO/2 };
+ unsigned int count = 0;
+ struct cpu_idle_cooling_device *idle_cooling_dev;
+
+ set_freezable();
+
+ sched_setscheduler(current, SCHED_FIFO, ¶m);
+
+ mutex_lock(&cpu_idle_cooling_lock);
+ idle_cooling_dev = get_cpu_idle_cooling_dev(cpunr);
+ mutex_unlock(&cpu_idle_cooling_lock);
+
+ while (!kthread_should_stop()) {
+ wait_event_interruptible(idle_cooling_dev->wait_queue,
+ (idle_cooling_dev->clamping && cpu_online(cpunr)) ||
+ kthread_should_stop());
+
+ if (kthread_should_stop())
+ break;
+
+ /* rebind thread to cpu */
+ if (set_cpus_allowed_ptr(current, cpumask_of(cpunr)))
+ continue;
+
+ try_to_freeze();
+
+ while (idle_cooling_dev->clamping &&
+ cpu_online(cpunr)) {
+ try_to_freeze();
+
+ count++;
+ /*
+ * only elected controlling cpu can collect stats
+ * and update control parameters.
+ */
+ if (cpunr == idle_cooling_dev->control_cpu
+ && !(count % idle_cooling_dev->window_size))
+ update_stats(idle_cooling_dev);
+
+ inject_idle_fn(idle_cooling_dev);
+ }
+ }
+
+ return 0;
+}
+
+static int create_idle_thread(struct cpu_idle_cooling_device *idle_cooling_dev)
+{
+ unsigned long cpu;
+ struct task_struct *thread;
+
+ init_waitqueue_head(&idle_cooling_dev->wait_queue);
+
+ /* start one thread per online cpu */
+ for_each_cpu(cpu, idle_cooling_dev->related_cpus) {
+ thread = kthread_create_on_node(idle_injection_thread,
+ (void *) cpu,
+ cpu_to_node(cpu),
+ "kidle_inject/%lu", cpu);
+ /* bind to cpu here */
+ if (likely(!IS_ERR(thread))) {
+ cpumask_set_cpu(cpu, idle_cooling_dev->injected_cpus);
+ kthread_bind(thread, cpu);
+ wake_up_process(thread);
+ per_cpu(idle_injection_thread_ptr, cpu) = thread;
+ } else {
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+static void stop_idle_thread(struct cpu_idle_cooling_device *idle_cooling_dev)
+{
+ unsigned long cpu;
+ struct task_struct **percpu_thread;
+
+ idle_cooling_dev->clamping = false;
+ /*
+ * make clamping visible to other cpus and give per cpu threads
+ * sometime to exit, or gets killed later.
+ */
+ smp_mb();
+ msleep(idle_cooling_dev->duration);
+ for_each_cpu(cpu, idle_cooling_dev->injected_cpus) {
+ pr_debug("idle inject thread for cpu %lu alive, kill\n", cpu);
+ percpu_thread = per_cpu_ptr(&idle_injection_thread_ptr, cpu);
+ if (!IS_ERR_OR_NULL(*percpu_thread)) {
+ kthread_stop(*percpu_thread);
+ *percpu_thread = NULL;
+ }
+ cpumask_clear_cpu(cpu, idle_cooling_dev->injected_cpus);
+ }
+}
+
+static int idle_injection_cpu_online(unsigned int cpu)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev;
+
+ idle_cooling_dev = get_cpu_idle_cooling_dev(cpu);
+ if (idle_cooling_dev) {
+ /* prefer BSP as controlling CPU */
+ if (cpu == cpumask_first(idle_cooling_dev->injected_cpus)
+ || !cpu_online(idle_cooling_dev->control_cpu)) {
+ idle_cooling_dev->control_cpu = cpu;
+ /* make new control_cpu visible to other cpus */
+ smp_mb();
+ }
+ wake_up_interruptible(&idle_cooling_dev->wait_queue);
+ }
+
+ return 0;
+}
+
+static int idle_injection_cpu_predown(unsigned int cpu)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev;
+
+ idle_cooling_dev = get_cpu_idle_cooling_dev(cpu);
+ if (idle_cooling_dev) {
+ if (cpu == idle_cooling_dev->control_cpu) {
+ cpu = cpumask_next_and(-1,
+ idle_cooling_dev->injected_cpus,
+ cpu_online_mask);
+
+ if (cpu < nr_cpu_ids)
+ idle_cooling_dev->control_cpu = cpu;
+ /* make new control_cpu visible to other cpus */
+ smp_mb();
+ }
+ }
+
+ return 0;
+}
+
+static int idle_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ *state = MAX_TARGET_RATIO;
+
+ return 0;
+}
+
+static int idle_get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev = cdev->devdata;
+
+ if (true == idle_cooling_dev->clamping)
+ *state = (unsigned long)idle_cooling_dev->current_ratio;
+ else
+ *state = 0; /* indicates invalid state */
+
+ return 0;
+}
+
+static int idle_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long new_target_ratio)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev = cdev->devdata;
+ int ret = 0;
+
+ mutex_lock(&cdev->lock);
+
+ new_target_ratio = clamp(new_target_ratio, 0UL,
+ (unsigned long) MAX_TARGET_RATIO);
+ if (idle_cooling_dev->set_target_ratio == 0
+ && new_target_ratio > 0) {
+ idle_cooling_dev->set_target_ratio =
+ (unsigned int) new_target_ratio;
+ idle_cooling_dev->control_ratio =
+ idle_cooling_dev->set_target_ratio;
+ idle_cooling_dev->current_ratio =
+ idle_cooling_dev->set_target_ratio;
+ idle_cooling_dev->clamping = true;
+ wake_up_interruptible(&idle_cooling_dev->wait_queue);
+ } else if (idle_cooling_dev->set_target_ratio > 0) {
+ if (new_target_ratio == 0) {
+ idle_cooling_dev->set_target_ratio = 0;
+ idle_cooling_dev->clamping = false;
+ /* make clamping visible to other cpus */
+ smp_mb();
+ } else /* adjust currently running */ {
+ idle_cooling_dev->set_target_ratio =
+ (unsigned int) new_target_ratio;
+ /* make new set_target_ratio visible to other cpus */
+ smp_mb();
+ }
+ }
+
+ mutex_unlock(&cdev->lock);
+
+ return ret;
+}
+
+static struct thermal_cooling_device_ops cpu_idle_injection_cooling_ops = {
+ .get_max_state = idle_get_max_state,
+ .get_cur_state = idle_get_cur_state,
+ .set_cur_state = idle_set_cur_state,
+};
+
+unsigned long get_max_idle_state(const struct cpumask *clip_cpus)
+{
+ return MAX_TARGET_RATIO;
+}
+EXPORT_SYMBOL_GPL(get_max_idle_state);
+
+void set_idle_state(const struct cpumask *clip_cpus, unsigned long idle_ratio)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev;
+
+ mutex_lock(&cpu_idle_cooling_lock);
+ list_for_each_entry(idle_cooling_dev,
+ &cpu_idle_cooling_dev_list, node) {
+ if (cpumask_subset(idle_cooling_dev->related_cpus, clip_cpus))
+ idle_set_cur_state(idle_cooling_dev->cooling_dev,
+ idle_ratio);
+ }
+ mutex_unlock(&cpu_idle_cooling_lock);
+}
+EXPORT_SYMBOL_GPL(set_idle_state);
+
+struct thermal_cooling_device * __init
+cpu_idle_cooling_register(const struct cpumask *clip_cpus)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev;
+ struct thermal_cooling_device *ret;
+ unsigned long cpu;
+ char dev_name[THERMAL_NAME_LENGTH];
+
+ if (cpumask_empty(clip_cpus))
+ return ERR_PTR(-ENOMEM);
+
+ mutex_lock(&cpu_idle_cooling_lock);
+ get_online_cpus();
+ list_for_each_entry(idle_cooling_dev,
+ &cpu_idle_cooling_dev_list, node) {
+ if (cpumask_intersects(idle_cooling_dev->related_cpus,
+ clip_cpus)) {
+ ret = ERR_PTR(-EINVAL);
+ goto exit_unlock;
+ }
+ }
+
+ idle_cooling_dev = kzalloc(sizeof(*idle_cooling_dev), GFP_KERNEL);
+ if (!idle_cooling_dev) {
+ ret = ERR_PTR(-ENOMEM);
+ goto exit_unlock;
+ }
+
+ if (!zalloc_cpumask_var(&idle_cooling_dev->related_cpus, GFP_KERNEL)) {
+ ret = ERR_PTR(-ENOMEM);
+ goto exit_free_dev;
+ }
+
+ if (!zalloc_cpumask_var(&idle_cooling_dev->injected_cpus, GFP_KERNEL)) {
+ ret = ERR_PTR(-ENOMEM);
+ goto exit_free_related_cpus;
+ }
+
+ cpumask_copy(idle_cooling_dev->related_cpus, clip_cpus);
+ cpu = cpumask_first(clip_cpus);
+ idle_cooling_dev->control_cpu = cpu;
+ idle_cooling_dev->id = topology_physical_package_id(cpu);
+ idle_cooling_dev->window_size = DEFAULT_WINDOW_SIZE;
+ idle_cooling_dev->duration = jiffies_to_msecs(DEFAULT_DURATION_JIFFIES);
+
+ if (create_idle_thread(idle_cooling_dev)) {
+ ret = ERR_PTR(-ENOMEM);
+ goto exit_free_injected_cpus;
+ }
+
+ snprintf(dev_name, sizeof(dev_name), "thermal-cpuidle-%d",
+ idle_cooling_dev->id);
+ ret = thermal_cooling_device_register(dev_name,
+ idle_cooling_dev,
+ &cpu_idle_injection_cooling_ops);
+ if (IS_ERR(ret))
+ goto exit_stop_thread;
+
+ idle_cooling_dev->cooling_dev = ret;
+
+ if (device_create_file(&idle_cooling_dev->cooling_dev->device,
+ &dev_attr_duration)) {
+ ret = ERR_PTR(-ENOMEM);
+ goto exit_unregister_cdev;
+ }
+
+ if (device_create_file(&idle_cooling_dev->cooling_dev->device,
+ &dev_attr_window_size)) {
+ ret = ERR_PTR(-ENOMEM);
+ goto exit_remove_duration_attr;
+ }
+
+ list_add(&idle_cooling_dev->node, &cpu_idle_cooling_dev_list);
+
+ goto exit_unlock;
+
+exit_remove_duration_attr:
+ device_remove_file(&idle_cooling_dev->cooling_dev->device,
+ &dev_attr_duration);
+exit_unregister_cdev:
+ thermal_cooling_device_unregister(idle_cooling_dev->cooling_dev);
+exit_stop_thread:
+ stop_idle_thread(idle_cooling_dev);
+exit_free_injected_cpus:
+ free_cpumask_var(idle_cooling_dev->injected_cpus);
+exit_free_related_cpus:
+ free_cpumask_var(idle_cooling_dev->related_cpus);
+exit_free_dev:
+ kfree(idle_cooling_dev);
+exit_unlock:
+ put_online_cpus();
+ mutex_unlock(&cpu_idle_cooling_lock);
+ return ret;
+}
+
+void cpu_idle_cooling_unregister(struct thermal_cooling_device *cdev)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev;
+
+ if (IS_ERR_OR_NULL(cdev))
+ return;
+
+ idle_cooling_dev = cdev->devdata;
+
+ mutex_lock(&cpu_idle_cooling_lock);
+ get_online_cpus();
+ list_del(&idle_cooling_dev->node);
+ put_online_cpus();
+ mutex_unlock(&cpu_idle_cooling_lock);
+
+ device_remove_file(&cdev->device, &dev_attr_window_size);
+ device_remove_file(&cdev->device, &dev_attr_duration);
+ thermal_cooling_device_unregister(idle_cooling_dev->cooling_dev);
+
+ stop_idle_thread(idle_cooling_dev);
+ free_cpumask_var(idle_cooling_dev->injected_cpus);
+ free_cpumask_var(idle_cooling_dev->related_cpus);
+ kfree(idle_cooling_dev);
+}
+
+static void __cpu_idle_cooling_exit(void)
+{
+ struct cpu_idle_cooling_device *idle_cooling_dev;
+
+ while (!list_empty(&cpu_idle_cooling_dev_list)) {
+ idle_cooling_dev = list_first_entry(&cpu_idle_cooling_dev_list,
+ struct cpu_idle_cooling_device, node);
+ cpu_idle_cooling_unregister(idle_cooling_dev->cooling_dev);
+ }
+
+ if (hp_state > 0)
+ cpuhp_remove_state_nocalls(hp_state);
+}
+
+static int __init cpu_idle_cooling_init(void)
+{
+ struct thermal_cooling_device *ret;
+ cpumask_t rest_cpu_mask = CPU_MASK_ALL;
+ const struct cpumask *register_cpu_mask;
+
+ hp_state = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
+ "thermal/cpu_idle_cooling:online",
+ idle_injection_cpu_online,
+ idle_injection_cpu_predown);
+ if (hp_state < 0)
+ return hp_state;
+
+ do {
+ register_cpu_mask =
+ topology_core_cpumask(cpumask_first(&rest_cpu_mask));
+
+ if (cpumask_empty(register_cpu_mask))
+ break;
+
+ ret = cpu_idle_cooling_register(register_cpu_mask);
+ if (IS_ERR(ret)) {
+ __cpu_idle_cooling_exit();
+ return -ENOMEM;
+ }
+ } while (cpumask_andnot(&rest_cpu_mask,
+ &rest_cpu_mask,
+ register_cpu_mask));
+
+ return 0;
+}
+module_init(cpu_idle_cooling_init);
+
+static void __exit cpu_idle_cooling_exit(void)
+{
+ __cpu_idle_cooling_exit();
+}
+module_exit(cpu_idle_cooling_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Tao Wang <kevin.wangtao@...ilicon.com>");
+MODULE_DESCRIPTION("CPU Idle Cooling Driver for ARM Platform");
--
1.7.9.5
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