--- /dev/null
+/* kernel/power/wakelock.c
+ *
+ * Copyright (C) 2005-2008 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/suspend.h>
+#include <linux/syscalls.h> /* sys_sync */
+#include <linux/wakelock.h>
+#ifdef CONFIG_WAKELOCK_STAT
+#include <linux/proc_fs.h>
+#endif
+#include "power.h"
+
+enum {
+ DEBUG_EXIT_SUSPEND = 1U << 0,
+ DEBUG_WAKEUP = 1U << 1,
+ DEBUG_SUSPEND = 1U << 2,
+ DEBUG_EXPIRE = 1U << 3,
+ DEBUG_WAKE_LOCK = 1U << 4,
+};
+static int debug_mask = DEBUG_EXIT_SUSPEND | DEBUG_WAKEUP;
+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
+
+#define WAKE_LOCK_TYPE_MASK (0x0f)
+#define WAKE_LOCK_INITIALIZED (1U << 8)
+#define WAKE_LOCK_ACTIVE (1U << 9)
+#define WAKE_LOCK_AUTO_EXPIRE (1U << 10)
+#define WAKE_LOCK_PREVENTING_SUSPEND (1U << 11)
+
+static DEFINE_SPINLOCK(list_lock);
+static LIST_HEAD(inactive_locks);
+static struct list_head active_wake_locks[WAKE_LOCK_TYPE_COUNT];
+static int current_event_num;
+struct workqueue_struct *suspend_work_queue;
+struct wake_lock main_wake_lock;
+suspend_state_t requested_suspend_state = PM_SUSPEND_MEM;
+static struct wake_lock unknown_wakeup;
+
+#ifdef CONFIG_WAKELOCK_STAT
+static struct wake_lock deleted_wake_locks;
+static ktime_t last_sleep_time_update;
+static int wait_for_wakeup;
+
+int get_expired_time(struct wake_lock *lock, ktime_t *expire_time)
+{
+ struct timespec ts;
+ struct timespec kt;
+ struct timespec tomono;
+ struct timespec delta;
+ unsigned long seq;
+ long timeout;
+
+ if (!(lock->flags & WAKE_LOCK_AUTO_EXPIRE))
+ return 0;
+ do {
+ seq = read_seqbegin(&xtime_lock);
+ timeout = lock->expires - jiffies;
+ if (timeout > 0)
+ return 0;
+ kt = current_kernel_time();
+ tomono = wall_to_monotonic;
+ } while (read_seqretry(&xtime_lock, seq));
+ jiffies_to_timespec(-timeout, &delta);
+ set_normalized_timespec(&ts, kt.tv_sec + tomono.tv_sec - delta.tv_sec,
+ kt.tv_nsec + tomono.tv_nsec - delta.tv_nsec);
+ *expire_time = timespec_to_ktime(ts);
+ return 1;
+}
+
+
+static int print_lock_stat(char *buf, struct wake_lock *lock)
+{
+ int lock_count = lock->stat.count;
+ int expire_count = lock->stat.expire_count;
+ ktime_t active_time = ktime_set(0, 0);
+ ktime_t total_time = lock->stat.total_time;
+ ktime_t max_time = lock->stat.max_time;
+ ktime_t prevent_suspend_time = lock->stat.prevent_suspend_time;
+ if (lock->flags & WAKE_LOCK_ACTIVE) {
+ ktime_t now, add_time;
+ int expired = get_expired_time(lock, &now);
+ if (!expired)
+ now = ktime_get();
+ add_time = ktime_sub(now, lock->stat.last_time);
+ lock_count++;
+ if (!expired)
+ active_time = add_time;
+ else
+ expire_count++;
+ total_time = ktime_add(total_time, add_time);
+ if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND)
+ prevent_suspend_time = ktime_add(prevent_suspend_time,
+ ktime_sub(now, last_sleep_time_update));
+ if (add_time.tv64 > max_time.tv64)
+ max_time = add_time;
+ }
+
+ return sprintf(buf, "\"%s\"\t%d\t%d\t%d\t%lld\t%lld\t%lld\t%lld\t"
+ "%lld\n", lock->name, lock_count, expire_count,
+ lock->stat.wakeup_count, ktime_to_ns(active_time),
+ ktime_to_ns(total_time),
+ ktime_to_ns(prevent_suspend_time), ktime_to_ns(max_time),
+ ktime_to_ns(lock->stat.last_time));
+}
+
+
+static int wakelocks_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ unsigned long irqflags;
+ struct wake_lock *lock;
+ int len = 0;
+ char *p = page;
+ int type;
+
+ spin_lock_irqsave(&list_lock, irqflags);
+
+ p += sprintf(p, "name\tcount\texpire_count\twake_count\tactive_since"
+ "\ttotal_time\tsleep_time\tmax_time\tlast_change\n");
+ list_for_each_entry(lock, &inactive_locks, link) {
+ p += print_lock_stat(p, lock);
+ }
+ for (type = 0; type < WAKE_LOCK_TYPE_COUNT; type++) {
+ list_for_each_entry(lock, &active_wake_locks[type], link)
+ p += print_lock_stat(p, lock);
+ }
+ spin_unlock_irqrestore(&list_lock, irqflags);
+
+ *start = page + off;
+
+ len = p - page;
+ if (len > off)
+ len -= off;
+ else
+ len = 0;
+
+ return len < count ? len : count;
+}
+
+static void wake_unlock_stat_locked(struct wake_lock *lock, int expired)
+{
+ ktime_t duration;
+ ktime_t now;
+ if (!(lock->flags & WAKE_LOCK_ACTIVE))
+ return;
+ if (get_expired_time(lock, &now))
+ expired = 1;
+ else
+ now = ktime_get();
+ lock->stat.count++;
+ if (expired)
+ lock->stat.expire_count++;
+ duration = ktime_sub(now, lock->stat.last_time);
+ lock->stat.total_time = ktime_add(lock->stat.total_time, duration);
+ if (ktime_to_ns(duration) > ktime_to_ns(lock->stat.max_time))
+ lock->stat.max_time = duration;
+ lock->stat.last_time = ktime_get();
+ if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND) {
+ duration = ktime_sub(now, last_sleep_time_update);
+ lock->stat.prevent_suspend_time = ktime_add(
+ lock->stat.prevent_suspend_time, duration);
+ lock->flags &= ~WAKE_LOCK_PREVENTING_SUSPEND;
+ }
+}
+
+static void update_sleep_wait_stats_locked(int done)
+{
+ struct wake_lock *lock;
+ ktime_t now, etime, elapsed, add;
+ int expired;
+
+ now = ktime_get();
+ elapsed = ktime_sub(now, last_sleep_time_update);
+ list_for_each_entry(lock, &active_wake_locks[WAKE_LOCK_SUSPEND], link) {
+ expired = get_expired_time(lock, &etime);
+ if (lock->flags & WAKE_LOCK_PREVENTING_SUSPEND) {
+ if (expired)
+ add = ktime_sub(etime, last_sleep_time_update);
+ else
+ add = elapsed;
+ lock->stat.prevent_suspend_time = ktime_add(
+ lock->stat.prevent_suspend_time, add);
+ }
+ if (done || expired)
+ lock->flags &= ~WAKE_LOCK_PREVENTING_SUSPEND;
+ else
+ lock->flags |= WAKE_LOCK_PREVENTING_SUSPEND;
+ }
+ last_sleep_time_update = now;
+}
+#endif
+
+
+static void expire_wake_lock(struct wake_lock *lock)
+{
+#ifdef CONFIG_WAKELOCK_STAT
+ wake_unlock_stat_locked(lock, 1);
+#endif
+ lock->flags &= ~(WAKE_LOCK_ACTIVE | WAKE_LOCK_AUTO_EXPIRE);
+ list_del(&lock->link);
+ list_add(&lock->link, &inactive_locks);
+ if (debug_mask & (DEBUG_WAKE_LOCK | DEBUG_EXPIRE))
+ pr_info("expired wake lock %s\n", lock->name);
+}
+
+static void print_active_locks(int type)
+{
+ unsigned long irqflags;
+ struct wake_lock *lock;
+
+ BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
+ spin_lock_irqsave(&list_lock, irqflags);
+ list_for_each_entry(lock, &active_wake_locks[type], link) {
+ if (lock->flags & WAKE_LOCK_AUTO_EXPIRE) {
+ long timeout = lock->expires - jiffies;
+ if (timeout <= 0)
+ pr_info("wake lock %s, expired\n", lock->name);
+ else
+ pr_info("active wake lock %s, time left %ld\n",
+ lock->name, timeout);
+ } else
+ pr_info("active wake lock %s\n", lock->name);
+ }
+ spin_unlock_irqrestore(&list_lock, irqflags);
+}
+
+static long has_wake_lock_locked(int type)
+{
+ struct wake_lock *lock, *n;
+ long max_timeout = 0;
+
+ BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
+ list_for_each_entry_safe(lock, n, &active_wake_locks[type], link) {
+ if (lock->flags & WAKE_LOCK_AUTO_EXPIRE) {
+ long timeout = lock->expires - jiffies;
+ if (timeout <= 0)
+ expire_wake_lock(lock);
+ else if (timeout > max_timeout)
+ max_timeout = timeout;
+ } else
+ return -1;
+ }
+ return max_timeout;
+}
+
+long has_wake_lock(int type)
+{
+ long ret;
+ unsigned long irqflags;
+ spin_lock_irqsave(&list_lock, irqflags);
+ ret = has_wake_lock_locked(type);
+ spin_unlock_irqrestore(&list_lock, irqflags);
+ return ret;
+}
+
+static void suspend(struct work_struct *work)
+{
+ int ret;
+ int entry_event_num;
+
+ if (has_wake_lock(WAKE_LOCK_SUSPEND)) {
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("suspend: abort suspend\n");
+ return;
+ }
+
+ entry_event_num = current_event_num;
+ sys_sync();
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("suspend: enter suspend\n");
+ ret = pm_suspend(requested_suspend_state);
+ if (debug_mask & DEBUG_EXIT_SUSPEND) {
+ struct timespec ts;
+ struct rtc_time tm;
+ getnstimeofday(&ts);
+ rtc_time_to_tm(ts.tv_sec, &tm);
+ pr_info("suspend: exit suspend, ret = %d "
+ "(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n", ret,
+ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
+ }
+ if (current_event_num == entry_event_num) {
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("suspend: pm_suspend returned with no event\n");
+ wake_lock_timeout(&unknown_wakeup, HZ / 2);
+ }
+}
+static DECLARE_WORK(suspend_work, suspend);
+
+static void expire_wake_locks(unsigned long data)
+{
+ long has_lock;
+ unsigned long irqflags;
+ if (debug_mask & DEBUG_EXPIRE)
+ pr_info("expire_wake_locks: start\n");
+ if (debug_mask & DEBUG_SUSPEND)
+ print_active_locks(WAKE_LOCK_SUSPEND);
+ spin_lock_irqsave(&list_lock, irqflags);
+ has_lock = has_wake_lock_locked(WAKE_LOCK_SUSPEND);
+ if (debug_mask & DEBUG_EXPIRE)
+ pr_info("expire_wake_locks: done, has_lock %ld\n", has_lock);
+ if (has_lock == 0)
+ queue_work(suspend_work_queue, &suspend_work);
+ spin_unlock_irqrestore(&list_lock, irqflags);
+}
+static DEFINE_TIMER(expire_timer, expire_wake_locks, 0, 0);
+
+static int power_suspend_late(struct device *dev)
+{
+ int ret = has_wake_lock(WAKE_LOCK_SUSPEND) ? -EAGAIN : 0;
+#ifdef CONFIG_WAKELOCK_STAT
+ wait_for_wakeup = 1;
+#endif
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("power_suspend_late return %d\n", ret);
+ return ret;
+}
+
+static struct dev_pm_ops power_driver_pm_ops = {
+ .suspend_noirq = power_suspend_late,
+};
+
+static struct platform_driver power_driver = {
+ .driver.name = "power",
+ .driver.pm = &power_driver_pm_ops,
+};
+static struct platform_device power_device = {
+ .name = "power",
+};
+
+void wake_lock_init(struct wake_lock *lock, int type, const char *name)
+{
+ unsigned long irqflags = 0;
+
+ if (name)
+ lock->name = name;
+ BUG_ON(!lock->name);
+
+ if (debug_mask & DEBUG_WAKE_LOCK)
+ pr_info("wake_lock_init name=%s\n", lock->name);
+#ifdef CONFIG_WAKELOCK_STAT
+ lock->stat.count = 0;
+ lock->stat.expire_count = 0;
+ lock->stat.wakeup_count = 0;
+ lock->stat.total_time = ktime_set(0, 0);
+ lock->stat.prevent_suspend_time = ktime_set(0, 0);
+ lock->stat.max_time = ktime_set(0, 0);
+ lock->stat.last_time = ktime_set(0, 0);
+#endif
+ lock->flags = (type & WAKE_LOCK_TYPE_MASK) | WAKE_LOCK_INITIALIZED;
+
+ INIT_LIST_HEAD(&lock->link);
+ spin_lock_irqsave(&list_lock, irqflags);
+ list_add(&lock->link, &inactive_locks);
+ spin_unlock_irqrestore(&list_lock, irqflags);
+}
+EXPORT_SYMBOL(wake_lock_init);
+
+void wake_lock_destroy(struct wake_lock *lock)
+{
+ unsigned long irqflags;
+ if (debug_mask & DEBUG_WAKE_LOCK)
+ pr_info("wake_lock_destroy name=%s\n", lock->name);
+ spin_lock_irqsave(&list_lock, irqflags);
+ lock->flags &= ~WAKE_LOCK_INITIALIZED;
+#ifdef CONFIG_WAKELOCK_STAT
+ if (lock->stat.count) {
+ deleted_wake_locks.stat.count += lock->stat.count;
+ deleted_wake_locks.stat.expire_count += lock->stat.expire_count;
+ deleted_wake_locks.stat.total_time =
+ ktime_add(deleted_wake_locks.stat.total_time,
+ lock->stat.total_time);
+ deleted_wake_locks.stat.prevent_suspend_time =
+ ktime_add(deleted_wake_locks.stat.prevent_suspend_time,
+ lock->stat.prevent_suspend_time);
+ deleted_wake_locks.stat.max_time =
+ ktime_add(deleted_wake_locks.stat.max_time,
+ lock->stat.max_time);
+ }
+#endif
+ list_del(&lock->link);
+ spin_unlock_irqrestore(&list_lock, irqflags);
+}
+EXPORT_SYMBOL(wake_lock_destroy);
+
+static void wake_lock_internal(
+ struct wake_lock *lock, long timeout, int has_timeout)
+{
+ int type;
+ unsigned long irqflags;
+ long expire_in;
+
+ spin_lock_irqsave(&list_lock, irqflags);
+ type = lock->flags & WAKE_LOCK_TYPE_MASK;
+ BUG_ON(type >= WAKE_LOCK_TYPE_COUNT);
+ BUG_ON(!(lock->flags & WAKE_LOCK_INITIALIZED));
+#ifdef CONFIG_WAKELOCK_STAT
+ if (type == WAKE_LOCK_SUSPEND && wait_for_wakeup) {
+ if (debug_mask & DEBUG_WAKEUP)
+ pr_info("wakeup wake lock: %s\n", lock->name);
+ wait_for_wakeup = 0;
+ lock->stat.wakeup_count++;
+ }
+ if ((lock->flags & WAKE_LOCK_AUTO_EXPIRE) &&
+ (long)(lock->expires - jiffies) <= 0) {
+ wake_unlock_stat_locked(lock, 0);
+ lock->stat.last_time = ktime_get();
+ }
+#endif
+ if (!(lock->flags & WAKE_LOCK_ACTIVE)) {
+ lock->flags |= WAKE_LOCK_ACTIVE;
+#ifdef CONFIG_WAKELOCK_STAT
+ lock->stat.last_time = ktime_get();
+#endif
+ }
+ list_del(&lock->link);
+ if (has_timeout) {
+ if (debug_mask & DEBUG_WAKE_LOCK)
+ pr_info("wake_lock: %s, type %d, timeout %ld.%03lu\n",
+ lock->name, type, timeout / HZ,
+ (timeout % HZ) * MSEC_PER_SEC / HZ);
+ lock->expires = jiffies + timeout;
+ lock->flags |= WAKE_LOCK_AUTO_EXPIRE;
+ list_add_tail(&lock->link, &active_wake_locks[type]);
+ } else {
+ if (debug_mask & DEBUG_WAKE_LOCK)
+ pr_info("wake_lock: %s, type %d\n", lock->name, type);
+ lock->expires = LONG_MAX;
+ lock->flags &= ~WAKE_LOCK_AUTO_EXPIRE;
+ list_add(&lock->link, &active_wake_locks[type]);
+ }
+ if (type == WAKE_LOCK_SUSPEND) {
+ current_event_num++;
+#ifdef CONFIG_WAKELOCK_STAT
+ if (lock == &main_wake_lock)
+ update_sleep_wait_stats_locked(1);
+ else if (!wake_lock_active(&main_wake_lock))
+ update_sleep_wait_stats_locked(0);
+#endif
+ if (has_timeout)
+ expire_in = has_wake_lock_locked(type);
+ else
+ expire_in = -1;
+ if (expire_in > 0) {
+ if (debug_mask & DEBUG_EXPIRE)
+ pr_info("wake_lock: %s, start expire timer, "
+ "%ld\n", lock->name, expire_in);
+ mod_timer(&expire_timer, jiffies + expire_in);
+ } else {
+ if (del_timer(&expire_timer))
+ if (debug_mask & DEBUG_EXPIRE)
+ pr_info("wake_lock: %s, stop expire timer\n",
+ lock->name);
+ if (expire_in == 0)
+ queue_work(suspend_work_queue, &suspend_work);
+ }
+ }
+ spin_unlock_irqrestore(&list_lock, irqflags);
+}
+
+void wake_lock(struct wake_lock *lock)
+{
+ wake_lock_internal(lock, 0, 0);
+}
+EXPORT_SYMBOL(wake_lock);
+
+void wake_lock_timeout(struct wake_lock *lock, long timeout)
+{
+ wake_lock_internal(lock, timeout, 1);
+}
+EXPORT_SYMBOL(wake_lock_timeout);
+
+void wake_unlock(struct wake_lock *lock)
+{
+ int type;
+ unsigned long irqflags;
+ spin_lock_irqsave(&list_lock, irqflags);
+ type = lock->flags & WAKE_LOCK_TYPE_MASK;
+#ifdef CONFIG_WAKELOCK_STAT
+ wake_unlock_stat_locked(lock, 0);
+#endif
+ if (debug_mask & DEBUG_WAKE_LOCK)
+ pr_info("wake_unlock: %s\n", lock->name);
+ lock->flags &= ~(WAKE_LOCK_ACTIVE | WAKE_LOCK_AUTO_EXPIRE);
+ list_del(&lock->link);
+ list_add(&lock->link, &inactive_locks);
+ if (type == WAKE_LOCK_SUSPEND) {
+ long has_lock = has_wake_lock_locked(type);
+ if (has_lock > 0) {
+ if (debug_mask & DEBUG_EXPIRE)
+ pr_info("wake_unlock: %s, start expire timer, "
+ "%ld\n", lock->name, has_lock);
+ mod_timer(&expire_timer, jiffies + has_lock);
+ } else {
+ if (del_timer(&expire_timer))
+ if (debug_mask & DEBUG_EXPIRE)
+ pr_info("wake_unlock: %s, stop expire "
+ "timer\n", lock->name);
+ if (has_lock == 0)
+ queue_work(suspend_work_queue, &suspend_work);
+ }
+ if (lock == &main_wake_lock) {
+ if (debug_mask & DEBUG_SUSPEND)
+ print_active_locks(WAKE_LOCK_SUSPEND);
+#ifdef CONFIG_WAKELOCK_STAT
+ update_sleep_wait_stats_locked(0);
+#endif
+ }
+ }
+ spin_unlock_irqrestore(&list_lock, irqflags);
+}
+EXPORT_SYMBOL(wake_unlock);
+
+int wake_lock_active(struct wake_lock *lock)
+{
+ return !!(lock->flags & WAKE_LOCK_ACTIVE);
+}
+EXPORT_SYMBOL(wake_lock_active);
+
+static int __init wakelocks_init(void)
+{
+ int ret;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(active_wake_locks); i++)
+ INIT_LIST_HEAD(&active_wake_locks[i]);
+
+#ifdef CONFIG_WAKELOCK_STAT
+ wake_lock_init(&deleted_wake_locks, WAKE_LOCK_SUSPEND,
+ "deleted_wake_locks");
+#endif
+ wake_lock_init(&main_wake_lock, WAKE_LOCK_SUSPEND, "main");
+ wake_lock(&main_wake_lock);
+ wake_lock_init(&unknown_wakeup, WAKE_LOCK_SUSPEND, "unknown_wakeups");
+
+ ret = platform_device_register(&power_device);
+ if (ret) {
+ pr_err("wakelocks_init: platform_device_register failed\n");
+ goto err_platform_device_register;
+ }
+ ret = platform_driver_register(&power_driver);
+ if (ret) {
+ pr_err("wakelocks_init: platform_driver_register failed\n");
+ goto err_platform_driver_register;
+ }
+
+ suspend_work_queue = create_singlethread_workqueue("suspend");
+ if (suspend_work_queue == NULL) {
+ ret = -ENOMEM;
+ goto err_suspend_work_queue;
+ }
+
+#ifdef CONFIG_WAKELOCK_STAT
+ create_proc_read_entry("wakelocks", S_IRUGO, NULL,
+ wakelocks_read_proc, NULL);
+#endif
+
+ return 0;
+
+err_suspend_work_queue:
+ platform_driver_unregister(&power_driver);
+err_platform_driver_register:
+ platform_device_unregister(&power_device);
+err_platform_device_register:
+ wake_lock_destroy(&unknown_wakeup);
+ wake_lock_destroy(&main_wake_lock);
+#ifdef CONFIG_WAKELOCK_STAT
+ wake_lock_destroy(&deleted_wake_locks);
+#endif
+ return ret;
+}
+
+static void __exit wakelocks_exit(void)
+{
+#ifdef CONFIG_WAKELOCK_STAT
+ remove_proc_entry("wakelocks", NULL);
+#endif
+ destroy_workqueue(suspend_work_queue);
+ platform_driver_unregister(&power_driver);
+ platform_device_unregister(&power_device);
+ wake_lock_destroy(&unknown_wakeup);
+ wake_lock_destroy(&main_wake_lock);
+#ifdef CONFIG_WAKELOCK_STAT
+ wake_lock_destroy(&deleted_wake_locks);
+#endif
+}
+
+core_initcall(wakelocks_init);
+module_exit(wakelocks_exit);
OSDN Git Service
