Blame view
kernel/power/wakelock.c
5.89 KB
b24413180 License cleanup: ... |
1 |
// SPDX-License-Identifier: GPL-2.0 |
b86ff9820 PM / Sleep: Add u... |
2 3 4 5 6 7 8 9 10 11 |
/* * kernel/power/wakelock.c * * User space wakeup sources support. * * Copyright (C) 2012 Rafael J. Wysocki <rjw@sisk.pl> * * This code is based on the analogous interface allowing user space to * manipulate wakelocks on Android. */ |
11388c87d PM / Sleep: Requi... |
12 |
#include <linux/capability.h> |
b86ff9820 PM / Sleep: Add u... |
13 14 15 16 17 18 19 |
#include <linux/ctype.h> #include <linux/device.h> #include <linux/err.h> #include <linux/hrtimer.h> #include <linux/list.h> #include <linux/rbtree.h> #include <linux/slab.h> |
6ce12a977 PM / autosleep: U... |
20 |
#include <linux/workqueue.h> |
b86ff9820 PM / Sleep: Add u... |
21 |
|
6c5be2916 PM / wakeup: Incl... |
22 |
#include "power.h" |
b86ff9820 PM / Sleep: Add u... |
23 24 25 26 27 |
static DEFINE_MUTEX(wakelocks_lock); struct wakelock { char *name; struct rb_node node; |
2434aea58 PM / wakeup: Use ... |
28 |
struct wakeup_source *ws; |
4e585d25e PM / Sleep: User ... |
29 |
#ifdef CONFIG_PM_WAKELOCKS_GC |
b86ff9820 PM / Sleep: Add u... |
30 |
struct list_head lru; |
4e585d25e PM / Sleep: User ... |
31 |
#endif |
b86ff9820 PM / Sleep: Add u... |
32 33 34 |
}; static struct rb_root wakelocks_tree = RB_ROOT; |
b86ff9820 PM / Sleep: Add u... |
35 36 37 38 39 40 41 42 43 44 45 46 |
ssize_t pm_show_wakelocks(char *buf, bool show_active) { struct rb_node *node; struct wakelock *wl; char *str = buf; char *end = buf + PAGE_SIZE; mutex_lock(&wakelocks_lock); for (node = rb_first(&wakelocks_tree); node; node = rb_next(node)) { wl = rb_entry(node, struct wakelock, node); |
2434aea58 PM / wakeup: Use ... |
47 |
if (wl->ws->active == show_active) |
b86ff9820 PM / Sleep: Add u... |
48 49 50 51 52 53 54 55 56 57 58 |
str += scnprintf(str, end - str, "%s ", wl->name); } if (str > buf) str--; str += scnprintf(str, end - str, " "); mutex_unlock(&wakelocks_lock); return (str - buf); } |
c73893e2c PM / Sleep: Make ... |
59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 |
#if CONFIG_PM_WAKELOCKS_LIMIT > 0 static unsigned int number_of_wakelocks; static inline bool wakelocks_limit_exceeded(void) { return number_of_wakelocks > CONFIG_PM_WAKELOCKS_LIMIT; } static inline void increment_wakelocks_number(void) { number_of_wakelocks++; } static inline void decrement_wakelocks_number(void) { number_of_wakelocks--; } #else /* CONFIG_PM_WAKELOCKS_LIMIT = 0 */ static inline bool wakelocks_limit_exceeded(void) { return false; } static inline void increment_wakelocks_number(void) {} static inline void decrement_wakelocks_number(void) {} #endif /* CONFIG_PM_WAKELOCKS_LIMIT */ |
4e585d25e PM / Sleep: User ... |
81 82 83 |
#ifdef CONFIG_PM_WAKELOCKS_GC #define WL_GC_COUNT_MAX 100 #define WL_GC_TIME_SEC 300 |
6ce12a977 PM / autosleep: U... |
84 |
static void __wakelocks_gc(struct work_struct *work); |
4e585d25e PM / Sleep: User ... |
85 |
static LIST_HEAD(wakelocks_lru_list); |
6ce12a977 PM / autosleep: U... |
86 |
static DECLARE_WORK(wakelock_work, __wakelocks_gc); |
4e585d25e PM / Sleep: User ... |
87 88 89 90 91 92 93 94 95 96 97 |
static unsigned int wakelocks_gc_count; static inline void wakelocks_lru_add(struct wakelock *wl) { list_add(&wl->lru, &wakelocks_lru_list); } static inline void wakelocks_lru_most_recent(struct wakelock *wl) { list_move(&wl->lru, &wakelocks_lru_list); } |
6ce12a977 PM / autosleep: U... |
98 |
static void __wakelocks_gc(struct work_struct *work) |
4e585d25e PM / Sleep: User ... |
99 100 101 |
{ struct wakelock *wl, *aux; ktime_t now; |
6ce12a977 PM / autosleep: U... |
102 |
mutex_lock(&wakelocks_lock); |
4e585d25e PM / Sleep: User ... |
103 104 105 106 107 |
now = ktime_get(); list_for_each_entry_safe_reverse(wl, aux, &wakelocks_lru_list, lru) { u64 idle_time_ns; bool active; |
2434aea58 PM / wakeup: Use ... |
108 109 110 111 |
spin_lock_irq(&wl->ws->lock); idle_time_ns = ktime_to_ns(ktime_sub(now, wl->ws->last_time)); active = wl->ws->active; spin_unlock_irq(&wl->ws->lock); |
4e585d25e PM / Sleep: User ... |
112 113 114 115 116 |
if (idle_time_ns < ((u64)WL_GC_TIME_SEC * NSEC_PER_SEC)) break; if (!active) { |
2434aea58 PM / wakeup: Use ... |
117 |
wakeup_source_unregister(wl->ws); |
4e585d25e PM / Sleep: User ... |
118 119 120 121 122 123 124 125 |
rb_erase(&wl->node, &wakelocks_tree); list_del(&wl->lru); kfree(wl->name); kfree(wl); decrement_wakelocks_number(); } } wakelocks_gc_count = 0; |
6ce12a977 PM / autosleep: U... |
126 127 128 129 130 131 132 133 134 135 |
mutex_unlock(&wakelocks_lock); } static void wakelocks_gc(void) { if (++wakelocks_gc_count <= WL_GC_COUNT_MAX) return; schedule_work(&wakelock_work); |
4e585d25e PM / Sleep: User ... |
136 137 138 139 140 141 |
} #else /* !CONFIG_PM_WAKELOCKS_GC */ static inline void wakelocks_lru_add(struct wakelock *wl) {} static inline void wakelocks_lru_most_recent(struct wakelock *wl) {} static inline void wakelocks_gc(void) {} #endif /* !CONFIG_PM_WAKELOCKS_GC */ |
b86ff9820 PM / Sleep: Add u... |
142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 |
static struct wakelock *wakelock_lookup_add(const char *name, size_t len, bool add_if_not_found) { struct rb_node **node = &wakelocks_tree.rb_node; struct rb_node *parent = *node; struct wakelock *wl; while (*node) { int diff; parent = *node; wl = rb_entry(*node, struct wakelock, node); diff = strncmp(name, wl->name, len); if (diff == 0) { if (wl->name[len]) diff = -1; else return wl; } if (diff < 0) node = &(*node)->rb_left; else node = &(*node)->rb_right; } if (!add_if_not_found) return ERR_PTR(-EINVAL); |
c73893e2c PM / Sleep: Make ... |
168 |
if (wakelocks_limit_exceeded()) |
b86ff9820 PM / Sleep: Add u... |
169 170 171 172 173 174 175 176 177 178 179 180 |
return ERR_PTR(-ENOSPC); /* Not found, we have to add a new one. */ wl = kzalloc(sizeof(*wl), GFP_KERNEL); if (!wl) return ERR_PTR(-ENOMEM); wl->name = kstrndup(name, len, GFP_KERNEL); if (!wl->name) { kfree(wl); return ERR_PTR(-ENOMEM); } |
2434aea58 PM / wakeup: Use ... |
181 |
|
c8377adfa PM / wakeup: Show... |
182 |
wl->ws = wakeup_source_register(NULL, wl->name); |
2434aea58 PM / wakeup: Use ... |
183 184 185 186 187 188 |
if (!wl->ws) { kfree(wl->name); kfree(wl); return ERR_PTR(-ENOMEM); } wl->ws->last_time = ktime_get(); |
b86ff9820 PM / Sleep: Add u... |
189 190 |
rb_link_node(&wl->node, parent, node); rb_insert_color(&wl->node, &wakelocks_tree); |
4e585d25e PM / Sleep: User ... |
191 |
wakelocks_lru_add(wl); |
c73893e2c PM / Sleep: Make ... |
192 |
increment_wakelocks_number(); |
b86ff9820 PM / Sleep: Add u... |
193 194 195 196 197 198 199 200 201 202 |
return wl; } int pm_wake_lock(const char *buf) { const char *str = buf; struct wakelock *wl; u64 timeout_ns = 0; size_t len; int ret = 0; |
11388c87d PM / Sleep: Requi... |
203 204 |
if (!capable(CAP_BLOCK_SUSPEND)) return -EPERM; |
b86ff9820 PM / Sleep: Add u... |
205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 |
while (*str && !isspace(*str)) str++; len = str - buf; if (!len) return -EINVAL; if (*str && *str != ' ') { /* Find out if there's a valid timeout string appended. */ ret = kstrtou64(skip_spaces(str), 10, &timeout_ns); if (ret) return -EINVAL; } mutex_lock(&wakelocks_lock); wl = wakelock_lookup_add(buf, len, true); if (IS_ERR(wl)) { ret = PTR_ERR(wl); goto out; } if (timeout_ns) { u64 timeout_ms = timeout_ns + NSEC_PER_MSEC - 1; do_div(timeout_ms, NSEC_PER_MSEC); |
2434aea58 PM / wakeup: Use ... |
231 |
__pm_wakeup_event(wl->ws, timeout_ms); |
b86ff9820 PM / Sleep: Add u... |
232 |
} else { |
2434aea58 PM / wakeup: Use ... |
233 |
__pm_stay_awake(wl->ws); |
b86ff9820 PM / Sleep: Add u... |
234 |
} |
4e585d25e PM / Sleep: User ... |
235 |
wakelocks_lru_most_recent(wl); |
b86ff9820 PM / Sleep: Add u... |
236 237 238 239 240 |
out: mutex_unlock(&wakelocks_lock); return ret; } |
b86ff9820 PM / Sleep: Add u... |
241 242 243 244 245 |
int pm_wake_unlock(const char *buf) { struct wakelock *wl; size_t len; int ret = 0; |
11388c87d PM / Sleep: Requi... |
246 247 |
if (!capable(CAP_BLOCK_SUSPEND)) return -EPERM; |
b86ff9820 PM / Sleep: Add u... |
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 |
len = strlen(buf); if (!len) return -EINVAL; if (buf[len-1] == ' ') len--; if (!len) return -EINVAL; mutex_lock(&wakelocks_lock); wl = wakelock_lookup_add(buf, len, false); if (IS_ERR(wl)) { ret = PTR_ERR(wl); goto out; } |
2434aea58 PM / wakeup: Use ... |
266 |
__pm_relax(wl->ws); |
4e585d25e PM / Sleep: User ... |
267 268 269 |
wakelocks_lru_most_recent(wl); wakelocks_gc(); |
b86ff9820 PM / Sleep: Add u... |
270 271 272 273 274 |
out: mutex_unlock(&wakelocks_lock); return ret; } |