Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 1 | /* |
| 2 | * kernel/power/suspend.c - Suspend to RAM and standby functionality. |
| 3 | * |
| 4 | * Copyright (c) 2003 Patrick Mochel |
| 5 | * Copyright (c) 2003 Open Source Development Lab |
| 6 | * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. |
| 7 | * |
| 8 | * This file is released under the GPLv2. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/string.h> |
| 12 | #include <linux/delay.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/console.h> |
| 16 | #include <linux/cpu.h> |
Rafael J. Wysocki | f3f1253 | 2014-04-20 23:43:01 +0200 | [diff] [blame] | 17 | #include <linux/cpuidle.h> |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 18 | #include <linux/syscalls.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/gfp.h> |
Matthew Garrett | dd4c4f1 | 2010-05-28 16:32:14 -0400 | [diff] [blame] | 20 | #include <linux/io.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/list.h> |
| 23 | #include <linux/mm.h> |
| 24 | #include <linux/slab.h> |
Paul Gortmaker | 6e5fdee | 2011-05-26 16:00:52 -0400 | [diff] [blame] | 25 | #include <linux/export.h> |
Matthew Garrett | dd4c4f1 | 2010-05-28 16:32:14 -0400 | [diff] [blame] | 26 | #include <linux/suspend.h> |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 27 | #include <linux/syscore_ops.h> |
Srivatsa S. Bhat | 443772d4 | 2012-06-16 15:30:45 +0200 | [diff] [blame] | 28 | #include <linux/ftrace.h> |
Todd Poynor | b9acbfe | 2012-05-29 17:33:56 -0700 | [diff] [blame] | 29 | #include <linux/rtc.h> |
Jean Pihet | 938cfed | 2011-01-05 19:49:01 +0100 | [diff] [blame] | 30 | #include <trace/events/power.h> |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 31 | #include <linux/compiler.h> |
Brian Norris | 1d4a9c1 | 2015-02-22 21:16:49 -0800 | [diff] [blame] | 32 | #include <linux/moduleparam.h> |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 33 | #include <linux/wakeup_reason.h> |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 34 | |
| 35 | #include "power.h" |
| 36 | |
Rafael J. Wysocki | 62109b4 | 2014-09-03 01:21:03 +0200 | [diff] [blame] | 37 | const char *pm_labels[] = { "mem", "standby", "freeze", NULL }; |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 38 | const char *pm_states[PM_SUSPEND_MAX]; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 39 | |
Rafael J. Wysocki | ef25ba0 | 2015-10-07 00:49:34 +0200 | [diff] [blame] | 40 | unsigned int pm_suspend_global_flags; |
| 41 | EXPORT_SYMBOL_GPL(pm_suspend_global_flags); |
| 42 | |
Lionel Debroux | 2f55ac0 | 2010-11-16 14:14:02 +0100 | [diff] [blame] | 43 | static const struct platform_suspend_ops *suspend_ops; |
Rafael J. Wysocki | 1f0b638 | 2014-05-15 23:29:57 +0200 | [diff] [blame] | 44 | static const struct platform_freeze_ops *freeze_ops; |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 45 | static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head); |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame] | 46 | |
| 47 | enum freeze_state __read_mostly suspend_freeze_state; |
| 48 | static DEFINE_SPINLOCK(suspend_freeze_lock); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 49 | |
Rafael J. Wysocki | 1f0b638 | 2014-05-15 23:29:57 +0200 | [diff] [blame] | 50 | void freeze_set_ops(const struct platform_freeze_ops *ops) |
| 51 | { |
| 52 | lock_system_sleep(); |
| 53 | freeze_ops = ops; |
| 54 | unlock_system_sleep(); |
| 55 | } |
| 56 | |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 57 | static void freeze_begin(void) |
| 58 | { |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame] | 59 | suspend_freeze_state = FREEZE_STATE_NONE; |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | static void freeze_enter(void) |
| 63 | { |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame] | 64 | spin_lock_irq(&suspend_freeze_lock); |
| 65 | if (pm_wakeup_pending()) |
| 66 | goto out; |
| 67 | |
| 68 | suspend_freeze_state = FREEZE_STATE_ENTER; |
| 69 | spin_unlock_irq(&suspend_freeze_lock); |
| 70 | |
| 71 | get_online_cpus(); |
Rafael J. Wysocki | f3f1253 | 2014-04-20 23:43:01 +0200 | [diff] [blame] | 72 | cpuidle_resume(); |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame] | 73 | |
| 74 | /* Push all the CPUs into the idle loop. */ |
| 75 | wake_up_all_idle_cpus(); |
| 76 | pr_debug("PM: suspend-to-idle\n"); |
| 77 | /* Make the current CPU wait so it can enter the idle loop too. */ |
| 78 | wait_event(suspend_freeze_wait_head, |
| 79 | suspend_freeze_state == FREEZE_STATE_WAKE); |
| 80 | pr_debug("PM: resume from suspend-to-idle\n"); |
| 81 | |
Rafael J. Wysocki | f3f1253 | 2014-04-20 23:43:01 +0200 | [diff] [blame] | 82 | cpuidle_pause(); |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame] | 83 | put_online_cpus(); |
| 84 | |
| 85 | spin_lock_irq(&suspend_freeze_lock); |
| 86 | |
| 87 | out: |
| 88 | suspend_freeze_state = FREEZE_STATE_NONE; |
| 89 | spin_unlock_irq(&suspend_freeze_lock); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | void freeze_wake(void) |
| 93 | { |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame] | 94 | unsigned long flags; |
| 95 | |
| 96 | spin_lock_irqsave(&suspend_freeze_lock, flags); |
| 97 | if (suspend_freeze_state > FREEZE_STATE_NONE) { |
| 98 | suspend_freeze_state = FREEZE_STATE_WAKE; |
| 99 | wake_up(&suspend_freeze_wait_head); |
| 100 | } |
| 101 | spin_unlock_irqrestore(&suspend_freeze_lock, flags); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 102 | } |
| 103 | EXPORT_SYMBOL_GPL(freeze_wake); |
| 104 | |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 105 | static bool valid_state(suspend_state_t state) |
| 106 | { |
| 107 | /* |
| 108 | * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level |
| 109 | * support and need to be valid to the low level |
| 110 | * implementation, no valid callback implies that none are valid. |
| 111 | */ |
| 112 | return suspend_ops && suspend_ops->valid && suspend_ops->valid(state); |
| 113 | } |
| 114 | |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 115 | /* |
| 116 | * If this is set, the "mem" label always corresponds to the deepest sleep state |
| 117 | * available, the "standby" label corresponds to the second deepest sleep state |
| 118 | * available (if any), and the "freeze" label corresponds to the remaining |
| 119 | * available sleep state (if there is one). |
| 120 | */ |
| 121 | static bool relative_states; |
| 122 | |
Sudeep Holla | fa7fd6f | 2016-08-19 14:41:00 +0100 | [diff] [blame] | 123 | void __init pm_states_init(void) |
| 124 | { |
| 125 | /* |
| 126 | * freeze state should be supported even without any suspend_ops, |
| 127 | * initialize pm_states accordingly here |
| 128 | */ |
| 129 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[relative_states ? 0 : 2]; |
| 130 | } |
| 131 | |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 132 | static int __init sleep_states_setup(char *str) |
| 133 | { |
| 134 | relative_states = !strncmp(str, "1", 1); |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 135 | return 1; |
| 136 | } |
| 137 | |
| 138 | __setup("relative_sleep_states=", sleep_states_setup); |
| 139 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 140 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 141 | * suspend_set_ops - Set the global suspend method table. |
| 142 | * @ops: Suspend operations to use. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 143 | */ |
Lionel Debroux | 2f55ac0 | 2010-11-16 14:14:02 +0100 | [diff] [blame] | 144 | void suspend_set_ops(const struct platform_suspend_ops *ops) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 145 | { |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 146 | suspend_state_t i; |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 147 | int j = 0; |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 148 | |
Srivatsa S. Bhat | bcda53f | 2011-12-07 22:29:54 +0100 | [diff] [blame] | 149 | lock_system_sleep(); |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 150 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 151 | suspend_ops = ops; |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 152 | for (i = PM_SUSPEND_MEM; i >= PM_SUSPEND_STANDBY; i--) |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 153 | if (valid_state(i)) { |
| 154 | pm_states[i] = pm_labels[j++]; |
| 155 | } else if (!relative_states) { |
| 156 | pm_states[i] = NULL; |
| 157 | j++; |
| 158 | } |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 159 | |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 160 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[j]; |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 161 | |
Srivatsa S. Bhat | bcda53f | 2011-12-07 22:29:54 +0100 | [diff] [blame] | 162 | unlock_system_sleep(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 163 | } |
Kevin Hilman | a5e4fd8 | 2011-06-27 01:01:07 +0200 | [diff] [blame] | 164 | EXPORT_SYMBOL_GPL(suspend_set_ops); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 165 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 166 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 167 | * suspend_valid_only_mem - Generic memory-only valid callback. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 168 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 169 | * Platform drivers that implement mem suspend only and only need to check for |
| 170 | * that in their .valid() callback can use this instead of rolling their own |
| 171 | * .valid() callback. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 172 | */ |
| 173 | int suspend_valid_only_mem(suspend_state_t state) |
| 174 | { |
| 175 | return state == PM_SUSPEND_MEM; |
| 176 | } |
Kevin Hilman | a5e4fd8 | 2011-06-27 01:01:07 +0200 | [diff] [blame] | 177 | EXPORT_SYMBOL_GPL(suspend_valid_only_mem); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 178 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 179 | static bool sleep_state_supported(suspend_state_t state) |
| 180 | { |
| 181 | return state == PM_SUSPEND_FREEZE || (suspend_ops && suspend_ops->enter); |
| 182 | } |
| 183 | |
| 184 | static int platform_suspend_prepare(suspend_state_t state) |
| 185 | { |
| 186 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare ? |
| 187 | suspend_ops->prepare() : 0; |
| 188 | } |
| 189 | |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 190 | static int platform_suspend_prepare_late(suspend_state_t state) |
| 191 | { |
Dmitry Eremin-Solenikov | 403b963 | 2014-11-08 19:17:13 +0300 | [diff] [blame] | 192 | return state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->prepare ? |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 193 | freeze_ops->prepare() : 0; |
| 194 | } |
| 195 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 196 | static int platform_suspend_prepare_noirq(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 197 | { |
| 198 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare_late ? |
| 199 | suspend_ops->prepare_late() : 0; |
| 200 | } |
| 201 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 202 | static void platform_resume_noirq(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 203 | { |
| 204 | if (state != PM_SUSPEND_FREEZE && suspend_ops->wake) |
| 205 | suspend_ops->wake(); |
| 206 | } |
| 207 | |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 208 | static void platform_resume_early(suspend_state_t state) |
| 209 | { |
Dmitry Eremin-Solenikov | 403b963 | 2014-11-08 19:17:13 +0300 | [diff] [blame] | 210 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->restore) |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 211 | freeze_ops->restore(); |
| 212 | } |
| 213 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 214 | static void platform_resume_finish(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 215 | { |
| 216 | if (state != PM_SUSPEND_FREEZE && suspend_ops->finish) |
| 217 | suspend_ops->finish(); |
| 218 | } |
| 219 | |
| 220 | static int platform_suspend_begin(suspend_state_t state) |
| 221 | { |
| 222 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->begin) |
| 223 | return freeze_ops->begin(); |
Sudeep Holla | fa7fd6f | 2016-08-19 14:41:00 +0100 | [diff] [blame] | 224 | else if (suspend_ops && suspend_ops->begin) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 225 | return suspend_ops->begin(state); |
| 226 | else |
| 227 | return 0; |
| 228 | } |
| 229 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 230 | static void platform_resume_end(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 231 | { |
| 232 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->end) |
| 233 | freeze_ops->end(); |
Sudeep Holla | fa7fd6f | 2016-08-19 14:41:00 +0100 | [diff] [blame] | 234 | else if (suspend_ops && suspend_ops->end) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 235 | suspend_ops->end(); |
| 236 | } |
| 237 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 238 | static void platform_recover(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 239 | { |
| 240 | if (state != PM_SUSPEND_FREEZE && suspend_ops->recover) |
| 241 | suspend_ops->recover(); |
| 242 | } |
| 243 | |
| 244 | static bool platform_suspend_again(suspend_state_t state) |
| 245 | { |
| 246 | return state != PM_SUSPEND_FREEZE && suspend_ops->suspend_again ? |
| 247 | suspend_ops->suspend_again() : false; |
| 248 | } |
| 249 | |
Brian Norris | 1d4a9c1 | 2015-02-22 21:16:49 -0800 | [diff] [blame] | 250 | #ifdef CONFIG_PM_DEBUG |
| 251 | static unsigned int pm_test_delay = 5; |
| 252 | module_param(pm_test_delay, uint, 0644); |
| 253 | MODULE_PARM_DESC(pm_test_delay, |
| 254 | "Number of seconds to wait before resuming from suspend test"); |
| 255 | #endif |
| 256 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 257 | static int suspend_test(int level) |
| 258 | { |
| 259 | #ifdef CONFIG_PM_DEBUG |
| 260 | if (pm_test_level == level) { |
saurabh | 22e09b3 | 2015-10-28 08:54:01 +0530 | [diff] [blame] | 261 | pr_info("suspend debug: Waiting for %d second(s).\n", |
Brian Norris | 1d4a9c1 | 2015-02-22 21:16:49 -0800 | [diff] [blame] | 262 | pm_test_delay); |
| 263 | mdelay(pm_test_delay * 1000); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 264 | return 1; |
| 265 | } |
| 266 | #endif /* !CONFIG_PM_DEBUG */ |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 271 | * suspend_prepare - Prepare for entering system sleep state. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 272 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 273 | * Common code run for every system sleep state that can be entered (except for |
| 274 | * hibernation). Run suspend notifiers, allocate the "suspend" console and |
| 275 | * freeze processes. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 276 | */ |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 277 | static int suspend_prepare(suspend_state_t state) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 278 | { |
Lianwei Wang | ea00f4f | 2016-06-19 23:52:27 -0700 | [diff] [blame] | 279 | int error, nr_calls = 0; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 280 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 281 | if (!sleep_state_supported(state)) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 282 | return -EPERM; |
| 283 | |
| 284 | pm_prepare_console(); |
| 285 | |
Lianwei Wang | ea00f4f | 2016-06-19 23:52:27 -0700 | [diff] [blame] | 286 | error = __pm_notifier_call_chain(PM_SUSPEND_PREPARE, -1, &nr_calls); |
| 287 | if (error) { |
| 288 | nr_calls--; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 289 | goto Finish; |
Lianwei Wang | ea00f4f | 2016-06-19 23:52:27 -0700 | [diff] [blame] | 290 | } |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 291 | |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 292 | trace_suspend_resume(TPS("freeze_processes"), 0, true); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 293 | error = suspend_freeze_processes(); |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 294 | trace_suspend_resume(TPS("freeze_processes"), 0, false); |
Tejun Heo | 03afed8 | 2011-11-21 12:32:24 -0800 | [diff] [blame] | 295 | if (!error) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 296 | return 0; |
| 297 | |
Tejun Heo | 03afed8 | 2011-11-21 12:32:24 -0800 | [diff] [blame] | 298 | suspend_stats.failed_freeze++; |
| 299 | dpm_save_failed_step(SUSPEND_FREEZE); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 300 | Finish: |
Lianwei Wang | ea00f4f | 2016-06-19 23:52:27 -0700 | [diff] [blame] | 301 | __pm_notifier_call_chain(PM_POST_SUSPEND, nr_calls, NULL); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 302 | pm_restore_console(); |
| 303 | return error; |
| 304 | } |
| 305 | |
| 306 | /* default implementation */ |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 307 | void __weak arch_suspend_disable_irqs(void) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 308 | { |
| 309 | local_irq_disable(); |
| 310 | } |
| 311 | |
| 312 | /* default implementation */ |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 313 | void __weak arch_suspend_enable_irqs(void) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 314 | { |
| 315 | local_irq_enable(); |
| 316 | } |
| 317 | |
| 318 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 319 | * suspend_enter - Make the system enter the given sleep state. |
| 320 | * @state: System sleep state to enter. |
| 321 | * @wakeup: Returns information that the sleep state should not be re-entered. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 322 | * |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 323 | * This function should be called after devices have been suspended. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 324 | */ |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 325 | static int suspend_enter(suspend_state_t state, bool *wakeup) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 326 | { |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 327 | char suspend_abort[MAX_SUSPEND_ABORT_LEN]; |
| 328 | int error, last_dev; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 329 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 330 | error = platform_suspend_prepare(state); |
| 331 | if (error) |
| 332 | goto Platform_finish; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 333 | |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 334 | error = dpm_suspend_late(PMSG_SUSPEND); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 335 | if (error) { |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 336 | last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; |
| 337 | last_dev %= REC_FAILED_NUM; |
saurabh | 22e09b3 | 2015-10-28 08:54:01 +0530 | [diff] [blame] | 338 | pr_err("PM: late suspend of devices failed\n"); |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 339 | log_suspend_abort_reason("%s device failed to power down", |
| 340 | suspend_stats.failed_devs[last_dev]); |
Rafael J. Wysocki | ce44101 | 2010-07-07 23:43:45 +0200 | [diff] [blame] | 341 | goto Platform_finish; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 342 | } |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 343 | error = platform_suspend_prepare_late(state); |
| 344 | if (error) |
| 345 | goto Devices_early_resume; |
| 346 | |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 347 | error = dpm_suspend_noirq(PMSG_SUSPEND); |
| 348 | if (error) { |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 349 | last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; |
| 350 | last_dev %= REC_FAILED_NUM; |
saurabh | 22e09b3 | 2015-10-28 08:54:01 +0530 | [diff] [blame] | 351 | pr_err("PM: noirq suspend of devices failed\n"); |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 352 | log_suspend_abort_reason("noirq suspend of %s device failed", |
| 353 | suspend_stats.failed_devs[last_dev]); |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 354 | goto Platform_early_resume; |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 355 | } |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 356 | error = platform_suspend_prepare_noirq(state); |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 357 | if (error) |
| 358 | goto Platform_wake; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 359 | |
Zhang Rui | 08605ac | 2013-03-27 03:36:10 +0000 | [diff] [blame] | 360 | if (suspend_test(TEST_PLATFORM)) |
| 361 | goto Platform_wake; |
| 362 | |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 363 | /* |
| 364 | * PM_SUSPEND_FREEZE equals |
| 365 | * frozen processes + suspended devices + idle processors. |
| 366 | * Thus we should invoke freeze_enter() soon after |
| 367 | * all the devices are suspended. |
| 368 | */ |
| 369 | if (state == PM_SUSPEND_FREEZE) { |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 370 | trace_suspend_resume(TPS("machine_suspend"), state, true); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 371 | freeze_enter(); |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 372 | trace_suspend_resume(TPS("machine_suspend"), state, false); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 373 | goto Platform_wake; |
| 374 | } |
| 375 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 376 | error = disable_nonboot_cpus(); |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 377 | if (error || suspend_test(TEST_CPUS)) { |
| 378 | log_suspend_abort_reason("Disabling non-boot cpus failed"); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 379 | goto Enable_cpus; |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 380 | } |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 381 | |
| 382 | arch_suspend_disable_irqs(); |
| 383 | BUG_ON(!irqs_disabled()); |
| 384 | |
Rafael J. Wysocki | 2e711c0 | 2011-04-26 19:15:07 +0200 | [diff] [blame] | 385 | error = syscore_suspend(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 386 | if (!error) { |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 387 | *wakeup = pm_wakeup_pending(); |
| 388 | if (!(suspend_test(TEST_CORE) || *wakeup)) { |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 389 | trace_suspend_resume(TPS("machine_suspend"), |
| 390 | state, true); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 391 | error = suspend_ops->enter(state); |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 392 | trace_suspend_resume(TPS("machine_suspend"), |
| 393 | state, false); |
Rafael J. Wysocki | c125e96 | 2010-07-05 22:43:53 +0200 | [diff] [blame] | 394 | events_check_enabled = false; |
Ruchi Kandoi | 6717673 | 2015-05-07 19:07:42 -0700 | [diff] [blame] | 395 | } else if (*wakeup) { |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 396 | pm_get_active_wakeup_sources(suspend_abort, |
| 397 | MAX_SUSPEND_ABORT_LEN); |
| 398 | log_suspend_abort_reason(suspend_abort); |
Ruchi Kandoi | 6717673 | 2015-05-07 19:07:42 -0700 | [diff] [blame] | 399 | error = -EBUSY; |
Rafael J. Wysocki | c125e96 | 2010-07-05 22:43:53 +0200 | [diff] [blame] | 400 | } |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 401 | syscore_resume(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | arch_suspend_enable_irqs(); |
| 405 | BUG_ON(irqs_disabled()); |
| 406 | |
| 407 | Enable_cpus: |
| 408 | enable_nonboot_cpus(); |
| 409 | |
| 410 | Platform_wake: |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 411 | platform_resume_noirq(state); |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 412 | dpm_resume_noirq(PMSG_RESUME); |
| 413 | |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 414 | Platform_early_resume: |
| 415 | platform_resume_early(state); |
| 416 | |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 417 | Devices_early_resume: |
| 418 | dpm_resume_early(PMSG_RESUME); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 419 | |
Rafael J. Wysocki | ce44101 | 2010-07-07 23:43:45 +0200 | [diff] [blame] | 420 | Platform_finish: |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 421 | platform_resume_finish(state); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 422 | return error; |
| 423 | } |
| 424 | |
| 425 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 426 | * suspend_devices_and_enter - Suspend devices and enter system sleep state. |
| 427 | * @state: System sleep state to enter. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 428 | */ |
| 429 | int suspend_devices_and_enter(suspend_state_t state) |
| 430 | { |
| 431 | int error; |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 432 | bool wakeup = false; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 433 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 434 | if (!sleep_state_supported(state)) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 435 | return -ENOSYS; |
| 436 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 437 | error = platform_suspend_begin(state); |
| 438 | if (error) |
| 439 | goto Close; |
| 440 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 441 | suspend_console(); |
| 442 | suspend_test_start(); |
| 443 | error = dpm_suspend_start(PMSG_SUSPEND); |
| 444 | if (error) { |
Bernie Thompson | 9350de06 | 2013-06-01 00:47:43 +0000 | [diff] [blame] | 445 | pr_err("PM: Some devices failed to suspend, or early wake event detected\n"); |
Ruchi Kandoi | c425eda | 2014-10-29 10:36:27 -0700 | [diff] [blame] | 446 | log_suspend_abort_reason("Some devices failed to suspend, or early wake event detected"); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 447 | goto Recover_platform; |
| 448 | } |
| 449 | suspend_test_finish("suspend devices"); |
| 450 | if (suspend_test(TEST_DEVICES)) |
| 451 | goto Recover_platform; |
| 452 | |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 453 | do { |
| 454 | error = suspend_enter(state, &wakeup); |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 455 | } while (!error && !wakeup && platform_suspend_again(state)); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 456 | |
| 457 | Resume_devices: |
| 458 | suspend_test_start(); |
| 459 | dpm_resume_end(PMSG_RESUME); |
| 460 | suspend_test_finish("resume devices"); |
Todd E Brandt | 0cadc70 | 2014-09-19 14:07:12 -0700 | [diff] [blame] | 461 | trace_suspend_resume(TPS("resume_console"), state, true); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 462 | resume_console(); |
Todd E Brandt | 0cadc70 | 2014-09-19 14:07:12 -0700 | [diff] [blame] | 463 | trace_suspend_resume(TPS("resume_console"), state, false); |
Rafael J. Wysocki | 1f0b638 | 2014-05-15 23:29:57 +0200 | [diff] [blame] | 464 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 465 | Close: |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 466 | platform_resume_end(state); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 467 | return error; |
| 468 | |
| 469 | Recover_platform: |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 470 | platform_recover(state); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 471 | goto Resume_devices; |
| 472 | } |
| 473 | |
| 474 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 475 | * suspend_finish - Clean up before finishing the suspend sequence. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 476 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 477 | * Call platform code to clean up, restart processes, and free the console that |
| 478 | * we've allocated. This routine is not called for hibernation. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 479 | */ |
| 480 | static void suspend_finish(void) |
| 481 | { |
| 482 | suspend_thaw_processes(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 483 | pm_notifier_call_chain(PM_POST_SUSPEND); |
| 484 | pm_restore_console(); |
| 485 | } |
| 486 | |
| 487 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 488 | * enter_state - Do common work needed to enter system sleep state. |
| 489 | * @state: System sleep state to enter. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 490 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 491 | * Make sure that no one else is trying to put the system into a sleep state. |
| 492 | * Fail if that's not the case. Otherwise, prepare for system suspend, make the |
| 493 | * system enter the given sleep state and clean up after wakeup. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 494 | */ |
Rafael J. Wysocki | 93e1ee4 | 2012-02-13 16:29:24 +0100 | [diff] [blame] | 495 | static int enter_state(suspend_state_t state) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 496 | { |
| 497 | int error; |
| 498 | |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 499 | trace_suspend_resume(TPS("suspend_enter"), state, true); |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 500 | if (state == PM_SUSPEND_FREEZE) { |
| 501 | #ifdef CONFIG_PM_DEBUG |
| 502 | if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) { |
Joe Perches | a395d6a | 2016-03-22 14:28:09 -0700 | [diff] [blame] | 503 | pr_warn("PM: Unsupported test mode for suspend to idle, please choose none/freezer/devices/platform.\n"); |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 504 | return -EAGAIN; |
| 505 | } |
| 506 | #endif |
| 507 | } else if (!valid_state(state)) { |
| 508 | return -EINVAL; |
| 509 | } |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 510 | if (!mutex_trylock(&pm_mutex)) |
| 511 | return -EBUSY; |
| 512 | |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 513 | if (state == PM_SUSPEND_FREEZE) |
| 514 | freeze_begin(); |
| 515 | |
Len Brown | 2fd77ff | 2015-07-31 12:46:17 -0400 | [diff] [blame] | 516 | #ifndef CONFIG_SUSPEND_SKIP_SYNC |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 517 | trace_suspend_resume(TPS("sync_filesystems"), 0, true); |
Jon Hunter | 1adb469 | 2016-10-21 16:24:09 +0100 | [diff] [blame] | 518 | pr_info("PM: Syncing filesystems ... "); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 519 | sys_sync(); |
Jon Hunter | 1adb469 | 2016-10-21 16:24:09 +0100 | [diff] [blame] | 520 | pr_cont("done.\n"); |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 521 | trace_suspend_resume(TPS("sync_filesystems"), 0, false); |
Len Brown | 2fd77ff | 2015-07-31 12:46:17 -0400 | [diff] [blame] | 522 | #endif |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 523 | |
Rafael J. Wysocki | a921504 | 2015-05-05 23:42:25 +0200 | [diff] [blame] | 524 | pr_debug("PM: Preparing system for sleep (%s)\n", pm_states[state]); |
Rafael J. Wysocki | ef25ba0 | 2015-10-07 00:49:34 +0200 | [diff] [blame] | 525 | pm_suspend_clear_flags(); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 526 | error = suspend_prepare(state); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 527 | if (error) |
| 528 | goto Unlock; |
| 529 | |
| 530 | if (suspend_test(TEST_FREEZER)) |
| 531 | goto Finish; |
| 532 | |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 533 | trace_suspend_resume(TPS("suspend_enter"), state, false); |
Rafael J. Wysocki | a921504 | 2015-05-05 23:42:25 +0200 | [diff] [blame] | 534 | pr_debug("PM: Suspending system (%s)\n", pm_states[state]); |
Rafael J. Wysocki | 8718647 | 2011-05-10 21:09:53 +0200 | [diff] [blame] | 535 | pm_restrict_gfp_mask(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 536 | error = suspend_devices_and_enter(state); |
Rafael J. Wysocki | 8718647 | 2011-05-10 21:09:53 +0200 | [diff] [blame] | 537 | pm_restore_gfp_mask(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 538 | |
| 539 | Finish: |
| 540 | pr_debug("PM: Finishing wakeup.\n"); |
| 541 | suspend_finish(); |
| 542 | Unlock: |
| 543 | mutex_unlock(&pm_mutex); |
| 544 | return error; |
| 545 | } |
| 546 | |
Todd Poynor | b9acbfe | 2012-05-29 17:33:56 -0700 | [diff] [blame] | 547 | static void pm_suspend_marker(char *annotation) |
| 548 | { |
| 549 | struct timespec ts; |
| 550 | struct rtc_time tm; |
| 551 | |
| 552 | getnstimeofday(&ts); |
| 553 | rtc_time_to_tm(ts.tv_sec, &tm); |
| 554 | pr_info("PM: suspend %s %d-%02d-%02d %02d:%02d:%02d.%09lu UTC\n", |
| 555 | annotation, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, |
| 556 | tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec); |
| 557 | } |
| 558 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 559 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 560 | * pm_suspend - Externally visible function for suspending the system. |
| 561 | * @state: System sleep state to enter. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 562 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 563 | * Check if the value of @state represents one of the supported states, |
| 564 | * execute enter_state() and update system suspend statistics. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 565 | */ |
| 566 | int pm_suspend(suspend_state_t state) |
| 567 | { |
Rafael J. Wysocki | bc25cf5 | 2012-02-13 16:29:33 +0100 | [diff] [blame] | 568 | int error; |
| 569 | |
| 570 | if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) |
| 571 | return -EINVAL; |
| 572 | |
Todd Poynor | b9acbfe | 2012-05-29 17:33:56 -0700 | [diff] [blame] | 573 | pm_suspend_marker("entry"); |
Rafael J. Wysocki | bc25cf5 | 2012-02-13 16:29:33 +0100 | [diff] [blame] | 574 | error = enter_state(state); |
| 575 | if (error) { |
| 576 | suspend_stats.fail++; |
| 577 | dpm_save_failed_errno(error); |
| 578 | } else { |
| 579 | suspend_stats.success++; |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 580 | } |
Todd Poynor | b9acbfe | 2012-05-29 17:33:56 -0700 | [diff] [blame] | 581 | pm_suspend_marker("exit"); |
Rafael J. Wysocki | bc25cf5 | 2012-02-13 16:29:33 +0100 | [diff] [blame] | 582 | return error; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 583 | } |
| 584 | EXPORT_SYMBOL(pm_suspend); |