^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * kernel/power/wakelock.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * User space wakeup sources support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2012 Rafael J. Wysocki <rjw@sisk.pl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * This code is based on the analogous interface allowing user space to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * manipulate wakelocks on Android.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/capability.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/hrtimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/rbtree.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "power.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static DEFINE_MUTEX(wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct wakelock {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct rb_node node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct wakeup_source *ws;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #ifdef CONFIG_PM_WAKELOCKS_GC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct list_head lru;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static struct rb_root wakelocks_tree = RB_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ssize_t pm_show_wakelocks(char *buf, bool show_active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct rb_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct wakelock *wl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) mutex_lock(&wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) for (node = rb_first(&wakelocks_tree); node; node = rb_next(node)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) wl = rb_entry(node, struct wakelock, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (wl->ws->active == show_active)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) len += sysfs_emit_at(buf, len, "%s ", wl->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) len += sysfs_emit_at(buf, len, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) mutex_unlock(&wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #if CONFIG_PM_WAKELOCKS_LIMIT > 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static unsigned int number_of_wakelocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static inline bool wakelocks_limit_exceeded(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return number_of_wakelocks > CONFIG_PM_WAKELOCKS_LIMIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static inline void increment_wakelocks_number(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) number_of_wakelocks++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static inline void decrement_wakelocks_number(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) number_of_wakelocks--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #else /* CONFIG_PM_WAKELOCKS_LIMIT = 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static inline bool wakelocks_limit_exceeded(void) { return false; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static inline void increment_wakelocks_number(void) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static inline void decrement_wakelocks_number(void) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #endif /* CONFIG_PM_WAKELOCKS_LIMIT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #ifdef CONFIG_PM_WAKELOCKS_GC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #define WL_GC_COUNT_MAX 100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #define WL_GC_TIME_SEC 300
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static void __wakelocks_gc(struct work_struct *work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static LIST_HEAD(wakelocks_lru_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static DECLARE_WORK(wakelock_work, __wakelocks_gc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static unsigned int wakelocks_gc_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static inline void wakelocks_lru_add(struct wakelock *wl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) list_add(&wl->lru, &wakelocks_lru_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static inline void wakelocks_lru_most_recent(struct wakelock *wl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) list_move(&wl->lru, &wakelocks_lru_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static void __wakelocks_gc(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct wakelock *wl, *aux;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ktime_t now;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) mutex_lock(&wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) now = ktime_get();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) list_for_each_entry_safe_reverse(wl, aux, &wakelocks_lru_list, lru) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) u64 idle_time_ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) bool active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) spin_lock_irq(&wl->ws->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) idle_time_ns = ktime_to_ns(ktime_sub(now, wl->ws->last_time));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) active = wl->ws->active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) spin_unlock_irq(&wl->ws->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (idle_time_ns < ((u64)WL_GC_TIME_SEC * NSEC_PER_SEC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (!active) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) wakeup_source_unregister(wl->ws);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) rb_erase(&wl->node, &wakelocks_tree);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) list_del(&wl->lru);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) kfree(wl->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) kfree(wl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) decrement_wakelocks_number();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) wakelocks_gc_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) mutex_unlock(&wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static void wakelocks_gc(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (++wakelocks_gc_count <= WL_GC_COUNT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) schedule_work(&wakelock_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) #else /* !CONFIG_PM_WAKELOCKS_GC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static inline void wakelocks_lru_add(struct wakelock *wl) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static inline void wakelocks_lru_most_recent(struct wakelock *wl) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static inline void wakelocks_gc(void) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #endif /* !CONFIG_PM_WAKELOCKS_GC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static struct wakelock *wakelock_lookup_add(const char *name, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) bool add_if_not_found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) struct rb_node **node = &wakelocks_tree.rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct rb_node *parent = *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct wakelock *wl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) while (*node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int diff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) parent = *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) wl = rb_entry(*node, struct wakelock, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) diff = strncmp(name, wl->name, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (diff == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (wl->name[len])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) diff = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return wl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (diff < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) node = &(*node)->rb_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) node = &(*node)->rb_right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (!add_if_not_found)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (wakelocks_limit_exceeded())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return ERR_PTR(-ENOSPC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /* Not found, we have to add a new one. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) wl = kzalloc(sizeof(*wl), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (!wl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) wl->name = kstrndup(name, len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (!wl->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) kfree(wl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) wl->ws = wakeup_source_register(NULL, wl->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (!wl->ws) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) kfree(wl->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) kfree(wl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) wl->ws->last_time = ktime_get();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) rb_link_node(&wl->node, parent, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) rb_insert_color(&wl->node, &wakelocks_tree);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) wakelocks_lru_add(wl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) increment_wakelocks_number();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return wl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) int pm_wake_lock(const char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) const char *str = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct wakelock *wl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) u64 timeout_ns = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (!capable(CAP_BLOCK_SUSPEND))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) while (*str && !isspace(*str))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) len = str - buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (*str && *str != '\n') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /* Find out if there's a valid timeout string appended. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ret = kstrtou64(skip_spaces(str), 10, &timeout_ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) mutex_lock(&wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) wl = wakelock_lookup_add(buf, len, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (IS_ERR(wl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ret = PTR_ERR(wl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (timeout_ns) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) u64 timeout_ms = timeout_ns + NSEC_PER_MSEC - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) do_div(timeout_ms, NSEC_PER_MSEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) __pm_wakeup_event(wl->ws, timeout_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) __pm_stay_awake(wl->ws);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) wakelocks_lru_most_recent(wl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) mutex_unlock(&wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) int pm_wake_unlock(const char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct wakelock *wl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) if (!capable(CAP_BLOCK_SUSPEND))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) len = strlen(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (buf[len-1] == '\n')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) mutex_lock(&wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) wl = wakelock_lookup_add(buf, len, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (IS_ERR(wl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) ret = PTR_ERR(wl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) __pm_relax(wl->ws);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) wakelocks_lru_most_recent(wl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) wakelocks_gc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) mutex_unlock(&wakelocks_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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