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> |
Jean Pihet | 938cfed | 2011-01-05 19:49:01 +0100 | [diff] [blame] | 29 | #include <trace/events/power.h> |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 30 | #include <linux/compiler.h> |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 31 | |
| 32 | #include "power.h" |
| 33 | |
Rafael J. Wysocki | 62109b4 | 2014-09-03 01:21:03 +0200 | [diff] [blame] | 34 | const char *pm_labels[] = { "mem", "standby", "freeze", NULL }; |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 35 | const char *pm_states[PM_SUSPEND_MAX]; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 36 | |
Lionel Debroux | 2f55ac0 | 2010-11-16 14:14:02 +0100 | [diff] [blame] | 37 | static const struct platform_suspend_ops *suspend_ops; |
Rafael J. Wysocki | 1f0b638 | 2014-05-15 23:29:57 +0200 | [diff] [blame] | 38 | static const struct platform_freeze_ops *freeze_ops; |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 39 | static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head); |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame^] | 40 | |
| 41 | enum freeze_state __read_mostly suspend_freeze_state; |
| 42 | static DEFINE_SPINLOCK(suspend_freeze_lock); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 43 | |
Rafael J. Wysocki | 1f0b638 | 2014-05-15 23:29:57 +0200 | [diff] [blame] | 44 | void freeze_set_ops(const struct platform_freeze_ops *ops) |
| 45 | { |
| 46 | lock_system_sleep(); |
| 47 | freeze_ops = ops; |
| 48 | unlock_system_sleep(); |
| 49 | } |
| 50 | |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 51 | static void freeze_begin(void) |
| 52 | { |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame^] | 53 | suspend_freeze_state = FREEZE_STATE_NONE; |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | static void freeze_enter(void) |
| 57 | { |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame^] | 58 | spin_lock_irq(&suspend_freeze_lock); |
| 59 | if (pm_wakeup_pending()) |
| 60 | goto out; |
| 61 | |
| 62 | suspend_freeze_state = FREEZE_STATE_ENTER; |
| 63 | spin_unlock_irq(&suspend_freeze_lock); |
| 64 | |
| 65 | get_online_cpus(); |
Rafael J. Wysocki | f3f1253 | 2014-04-20 23:43:01 +0200 | [diff] [blame] | 66 | cpuidle_resume(); |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame^] | 67 | |
| 68 | /* Push all the CPUs into the idle loop. */ |
| 69 | wake_up_all_idle_cpus(); |
| 70 | pr_debug("PM: suspend-to-idle\n"); |
| 71 | /* Make the current CPU wait so it can enter the idle loop too. */ |
| 72 | wait_event(suspend_freeze_wait_head, |
| 73 | suspend_freeze_state == FREEZE_STATE_WAKE); |
| 74 | pr_debug("PM: resume from suspend-to-idle\n"); |
| 75 | |
Rafael J. Wysocki | f3f1253 | 2014-04-20 23:43:01 +0200 | [diff] [blame] | 76 | cpuidle_pause(); |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame^] | 77 | put_online_cpus(); |
| 78 | |
| 79 | spin_lock_irq(&suspend_freeze_lock); |
| 80 | |
| 81 | out: |
| 82 | suspend_freeze_state = FREEZE_STATE_NONE; |
| 83 | spin_unlock_irq(&suspend_freeze_lock); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | void freeze_wake(void) |
| 87 | { |
Rafael J. Wysocki | 3810631 | 2015-02-12 23:33:15 +0100 | [diff] [blame^] | 88 | unsigned long flags; |
| 89 | |
| 90 | spin_lock_irqsave(&suspend_freeze_lock, flags); |
| 91 | if (suspend_freeze_state > FREEZE_STATE_NONE) { |
| 92 | suspend_freeze_state = FREEZE_STATE_WAKE; |
| 93 | wake_up(&suspend_freeze_wait_head); |
| 94 | } |
| 95 | spin_unlock_irqrestore(&suspend_freeze_lock, flags); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 96 | } |
| 97 | EXPORT_SYMBOL_GPL(freeze_wake); |
| 98 | |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 99 | static bool valid_state(suspend_state_t state) |
| 100 | { |
| 101 | /* |
| 102 | * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level |
| 103 | * support and need to be valid to the low level |
| 104 | * implementation, no valid callback implies that none are valid. |
| 105 | */ |
| 106 | return suspend_ops && suspend_ops->valid && suspend_ops->valid(state); |
| 107 | } |
| 108 | |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 109 | /* |
| 110 | * If this is set, the "mem" label always corresponds to the deepest sleep state |
| 111 | * available, the "standby" label corresponds to the second deepest sleep state |
| 112 | * available (if any), and the "freeze" label corresponds to the remaining |
| 113 | * available sleep state (if there is one). |
| 114 | */ |
| 115 | static bool relative_states; |
| 116 | |
| 117 | static int __init sleep_states_setup(char *str) |
| 118 | { |
| 119 | relative_states = !strncmp(str, "1", 1); |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 120 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[relative_states ? 0 : 2]; |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 121 | return 1; |
| 122 | } |
| 123 | |
| 124 | __setup("relative_sleep_states=", sleep_states_setup); |
| 125 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 126 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 127 | * suspend_set_ops - Set the global suspend method table. |
| 128 | * @ops: Suspend operations to use. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 129 | */ |
Lionel Debroux | 2f55ac0 | 2010-11-16 14:14:02 +0100 | [diff] [blame] | 130 | void suspend_set_ops(const struct platform_suspend_ops *ops) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 131 | { |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 132 | suspend_state_t i; |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 133 | int j = 0; |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 134 | |
Srivatsa S. Bhat | bcda53f | 2011-12-07 22:29:54 +0100 | [diff] [blame] | 135 | lock_system_sleep(); |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 136 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 137 | suspend_ops = ops; |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 138 | for (i = PM_SUSPEND_MEM; i >= PM_SUSPEND_STANDBY; i--) |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 139 | if (valid_state(i)) { |
| 140 | pm_states[i] = pm_labels[j++]; |
| 141 | } else if (!relative_states) { |
| 142 | pm_states[i] = NULL; |
| 143 | j++; |
| 144 | } |
Rafael J. Wysocki | 0399d4d | 2014-05-26 13:40:59 +0200 | [diff] [blame] | 145 | |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 146 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[j]; |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 147 | |
Srivatsa S. Bhat | bcda53f | 2011-12-07 22:29:54 +0100 | [diff] [blame] | 148 | unlock_system_sleep(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 149 | } |
Kevin Hilman | a5e4fd8 | 2011-06-27 01:01:07 +0200 | [diff] [blame] | 150 | EXPORT_SYMBOL_GPL(suspend_set_ops); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 151 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 152 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 153 | * suspend_valid_only_mem - Generic memory-only valid callback. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 154 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 155 | * Platform drivers that implement mem suspend only and only need to check for |
| 156 | * that in their .valid() callback can use this instead of rolling their own |
| 157 | * .valid() callback. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 158 | */ |
| 159 | int suspend_valid_only_mem(suspend_state_t state) |
| 160 | { |
| 161 | return state == PM_SUSPEND_MEM; |
| 162 | } |
Kevin Hilman | a5e4fd8 | 2011-06-27 01:01:07 +0200 | [diff] [blame] | 163 | EXPORT_SYMBOL_GPL(suspend_valid_only_mem); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 164 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 165 | static bool sleep_state_supported(suspend_state_t state) |
| 166 | { |
| 167 | return state == PM_SUSPEND_FREEZE || (suspend_ops && suspend_ops->enter); |
| 168 | } |
| 169 | |
| 170 | static int platform_suspend_prepare(suspend_state_t state) |
| 171 | { |
| 172 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare ? |
| 173 | suspend_ops->prepare() : 0; |
| 174 | } |
| 175 | |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 176 | static int platform_suspend_prepare_late(suspend_state_t state) |
| 177 | { |
Dmitry Eremin-Solenikov | 403b963 | 2014-11-08 19:17:13 +0300 | [diff] [blame] | 178 | return state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->prepare ? |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 179 | freeze_ops->prepare() : 0; |
| 180 | } |
| 181 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 182 | static int platform_suspend_prepare_noirq(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 183 | { |
| 184 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare_late ? |
| 185 | suspend_ops->prepare_late() : 0; |
| 186 | } |
| 187 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 188 | static void platform_resume_noirq(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 189 | { |
| 190 | if (state != PM_SUSPEND_FREEZE && suspend_ops->wake) |
| 191 | suspend_ops->wake(); |
| 192 | } |
| 193 | |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 194 | static void platform_resume_early(suspend_state_t state) |
| 195 | { |
Dmitry Eremin-Solenikov | 403b963 | 2014-11-08 19:17:13 +0300 | [diff] [blame] | 196 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->restore) |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 197 | freeze_ops->restore(); |
| 198 | } |
| 199 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 200 | static void platform_resume_finish(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 201 | { |
| 202 | if (state != PM_SUSPEND_FREEZE && suspend_ops->finish) |
| 203 | suspend_ops->finish(); |
| 204 | } |
| 205 | |
| 206 | static int platform_suspend_begin(suspend_state_t state) |
| 207 | { |
| 208 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->begin) |
| 209 | return freeze_ops->begin(); |
| 210 | else if (suspend_ops->begin) |
| 211 | return suspend_ops->begin(state); |
| 212 | else |
| 213 | return 0; |
| 214 | } |
| 215 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 216 | static void platform_resume_end(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 217 | { |
| 218 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->end) |
| 219 | freeze_ops->end(); |
| 220 | else if (suspend_ops->end) |
| 221 | suspend_ops->end(); |
| 222 | } |
| 223 | |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 224 | static void platform_recover(suspend_state_t state) |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 225 | { |
| 226 | if (state != PM_SUSPEND_FREEZE && suspend_ops->recover) |
| 227 | suspend_ops->recover(); |
| 228 | } |
| 229 | |
| 230 | static bool platform_suspend_again(suspend_state_t state) |
| 231 | { |
| 232 | return state != PM_SUSPEND_FREEZE && suspend_ops->suspend_again ? |
| 233 | suspend_ops->suspend_again() : false; |
| 234 | } |
| 235 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 236 | static int suspend_test(int level) |
| 237 | { |
| 238 | #ifdef CONFIG_PM_DEBUG |
| 239 | if (pm_test_level == level) { |
| 240 | printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n"); |
| 241 | mdelay(5000); |
| 242 | return 1; |
| 243 | } |
| 244 | #endif /* !CONFIG_PM_DEBUG */ |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 249 | * suspend_prepare - Prepare for entering system sleep state. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 250 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 251 | * Common code run for every system sleep state that can be entered (except for |
| 252 | * hibernation). Run suspend notifiers, allocate the "suspend" console and |
| 253 | * freeze processes. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 254 | */ |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 255 | static int suspend_prepare(suspend_state_t state) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 256 | { |
| 257 | int error; |
| 258 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 259 | if (!sleep_state_supported(state)) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 260 | return -EPERM; |
| 261 | |
| 262 | pm_prepare_console(); |
| 263 | |
| 264 | error = pm_notifier_call_chain(PM_SUSPEND_PREPARE); |
| 265 | if (error) |
| 266 | goto Finish; |
| 267 | |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 268 | trace_suspend_resume(TPS("freeze_processes"), 0, true); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 269 | error = suspend_freeze_processes(); |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 270 | trace_suspend_resume(TPS("freeze_processes"), 0, false); |
Tejun Heo | 03afed8 | 2011-11-21 12:32:24 -0800 | [diff] [blame] | 271 | if (!error) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 272 | return 0; |
| 273 | |
Tejun Heo | 03afed8 | 2011-11-21 12:32:24 -0800 | [diff] [blame] | 274 | suspend_stats.failed_freeze++; |
| 275 | dpm_save_failed_step(SUSPEND_FREEZE); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 276 | Finish: |
| 277 | pm_notifier_call_chain(PM_POST_SUSPEND); |
| 278 | pm_restore_console(); |
| 279 | return error; |
| 280 | } |
| 281 | |
| 282 | /* default implementation */ |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 283 | void __weak arch_suspend_disable_irqs(void) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 284 | { |
| 285 | local_irq_disable(); |
| 286 | } |
| 287 | |
| 288 | /* default implementation */ |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 289 | void __weak arch_suspend_enable_irqs(void) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 290 | { |
| 291 | local_irq_enable(); |
| 292 | } |
| 293 | |
| 294 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 295 | * suspend_enter - Make the system enter the given sleep state. |
| 296 | * @state: System sleep state to enter. |
| 297 | * @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] | 298 | * |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 299 | * This function should be called after devices have been suspended. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 300 | */ |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 301 | static int suspend_enter(suspend_state_t state, bool *wakeup) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 302 | { |
| 303 | int error; |
| 304 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 305 | error = platform_suspend_prepare(state); |
| 306 | if (error) |
| 307 | goto Platform_finish; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 308 | |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 309 | error = dpm_suspend_late(PMSG_SUSPEND); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 310 | if (error) { |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 311 | printk(KERN_ERR "PM: late suspend of devices failed\n"); |
Rafael J. Wysocki | ce44101 | 2010-07-07 23:43:45 +0200 | [diff] [blame] | 312 | goto Platform_finish; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 313 | } |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 314 | error = platform_suspend_prepare_late(state); |
| 315 | if (error) |
| 316 | goto Devices_early_resume; |
| 317 | |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 318 | error = dpm_suspend_noirq(PMSG_SUSPEND); |
| 319 | if (error) { |
| 320 | printk(KERN_ERR "PM: noirq suspend of devices failed\n"); |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 321 | goto Platform_early_resume; |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 322 | } |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 323 | error = platform_suspend_prepare_noirq(state); |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 324 | if (error) |
| 325 | goto Platform_wake; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 326 | |
Zhang Rui | 08605ac | 2013-03-27 03:36:10 +0000 | [diff] [blame] | 327 | if (suspend_test(TEST_PLATFORM)) |
| 328 | goto Platform_wake; |
| 329 | |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 330 | /* |
| 331 | * PM_SUSPEND_FREEZE equals |
| 332 | * frozen processes + suspended devices + idle processors. |
| 333 | * Thus we should invoke freeze_enter() soon after |
| 334 | * all the devices are suspended. |
| 335 | */ |
| 336 | if (state == PM_SUSPEND_FREEZE) { |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 337 | trace_suspend_resume(TPS("machine_suspend"), state, true); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 338 | freeze_enter(); |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 339 | trace_suspend_resume(TPS("machine_suspend"), state, false); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 340 | goto Platform_wake; |
| 341 | } |
| 342 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 343 | error = disable_nonboot_cpus(); |
| 344 | if (error || suspend_test(TEST_CPUS)) |
| 345 | goto Enable_cpus; |
| 346 | |
| 347 | arch_suspend_disable_irqs(); |
| 348 | BUG_ON(!irqs_disabled()); |
| 349 | |
Rafael J. Wysocki | 2e711c0 | 2011-04-26 19:15:07 +0200 | [diff] [blame] | 350 | error = syscore_suspend(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 351 | if (!error) { |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 352 | *wakeup = pm_wakeup_pending(); |
| 353 | if (!(suspend_test(TEST_CORE) || *wakeup)) { |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 354 | trace_suspend_resume(TPS("machine_suspend"), |
| 355 | state, true); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 356 | error = suspend_ops->enter(state); |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 357 | trace_suspend_resume(TPS("machine_suspend"), |
| 358 | state, false); |
Rafael J. Wysocki | c125e96 | 2010-07-05 22:43:53 +0200 | [diff] [blame] | 359 | events_check_enabled = false; |
| 360 | } |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 361 | syscore_resume(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 362 | } |
| 363 | |
| 364 | arch_suspend_enable_irqs(); |
| 365 | BUG_ON(irqs_disabled()); |
| 366 | |
| 367 | Enable_cpus: |
| 368 | enable_nonboot_cpus(); |
| 369 | |
| 370 | Platform_wake: |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 371 | platform_resume_noirq(state); |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 372 | dpm_resume_noirq(PMSG_RESUME); |
| 373 | |
Rafael J. Wysocki | a8d46b9 | 2014-09-30 02:29:01 +0200 | [diff] [blame] | 374 | Platform_early_resume: |
| 375 | platform_resume_early(state); |
| 376 | |
Rafael J. Wysocki | 2a8a8ce | 2014-09-30 02:21:34 +0200 | [diff] [blame] | 377 | Devices_early_resume: |
| 378 | dpm_resume_early(PMSG_RESUME); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 379 | |
Rafael J. Wysocki | ce44101 | 2010-07-07 23:43:45 +0200 | [diff] [blame] | 380 | Platform_finish: |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 381 | platform_resume_finish(state); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 382 | return error; |
| 383 | } |
| 384 | |
| 385 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 386 | * suspend_devices_and_enter - Suspend devices and enter system sleep state. |
| 387 | * @state: System sleep state to enter. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 388 | */ |
| 389 | int suspend_devices_and_enter(suspend_state_t state) |
| 390 | { |
| 391 | int error; |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 392 | bool wakeup = false; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 393 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 394 | if (!sleep_state_supported(state)) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 395 | return -ENOSYS; |
| 396 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 397 | error = platform_suspend_begin(state); |
| 398 | if (error) |
| 399 | goto Close; |
| 400 | |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 401 | suspend_console(); |
| 402 | suspend_test_start(); |
| 403 | error = dpm_suspend_start(PMSG_SUSPEND); |
| 404 | if (error) { |
Bernie Thompson | 9350de06 | 2013-06-01 00:47:43 +0000 | [diff] [blame] | 405 | pr_err("PM: Some devices failed to suspend, or early wake event detected\n"); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 406 | goto Recover_platform; |
| 407 | } |
| 408 | suspend_test_finish("suspend devices"); |
| 409 | if (suspend_test(TEST_DEVICES)) |
| 410 | goto Recover_platform; |
| 411 | |
MyungJoo Ham | 3b5fe85 | 2011-06-12 15:57:05 +0200 | [diff] [blame] | 412 | do { |
| 413 | error = suspend_enter(state, &wakeup); |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 414 | } while (!error && !wakeup && platform_suspend_again(state)); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 415 | |
| 416 | Resume_devices: |
| 417 | suspend_test_start(); |
| 418 | dpm_resume_end(PMSG_RESUME); |
| 419 | suspend_test_finish("resume devices"); |
Todd E Brandt | 0cadc70 | 2014-09-19 14:07:12 -0700 | [diff] [blame] | 420 | trace_suspend_resume(TPS("resume_console"), state, true); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 421 | resume_console(); |
Todd E Brandt | 0cadc70 | 2014-09-19 14:07:12 -0700 | [diff] [blame] | 422 | trace_suspend_resume(TPS("resume_console"), state, false); |
Rafael J. Wysocki | 1f0b638 | 2014-05-15 23:29:57 +0200 | [diff] [blame] | 423 | |
Rafael J. Wysocki | 8490fdf | 2014-07-23 00:57:53 +0200 | [diff] [blame] | 424 | Close: |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 425 | platform_resume_end(state); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 426 | return error; |
| 427 | |
| 428 | Recover_platform: |
Rafael J. Wysocki | ebc3e41 | 2014-09-30 02:22:24 +0200 | [diff] [blame] | 429 | platform_recover(state); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 430 | goto Resume_devices; |
| 431 | } |
| 432 | |
| 433 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 434 | * suspend_finish - Clean up before finishing the suspend sequence. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 435 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 436 | * Call platform code to clean up, restart processes, and free the console that |
| 437 | * we've allocated. This routine is not called for hibernation. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 438 | */ |
| 439 | static void suspend_finish(void) |
| 440 | { |
| 441 | suspend_thaw_processes(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 442 | pm_notifier_call_chain(PM_POST_SUSPEND); |
| 443 | pm_restore_console(); |
| 444 | } |
| 445 | |
| 446 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 447 | * enter_state - Do common work needed to enter system sleep state. |
| 448 | * @state: System sleep state to enter. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 449 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 450 | * Make sure that no one else is trying to put the system into a sleep state. |
| 451 | * Fail if that's not the case. Otherwise, prepare for system suspend, make the |
| 452 | * system enter the given sleep state and clean up after wakeup. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 453 | */ |
Rafael J. Wysocki | 93e1ee4 | 2012-02-13 16:29:24 +0100 | [diff] [blame] | 454 | static int enter_state(suspend_state_t state) |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 455 | { |
| 456 | int error; |
| 457 | |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 458 | trace_suspend_resume(TPS("suspend_enter"), state, true); |
Rafael J. Wysocki | 43e8317 | 2014-05-26 13:40:53 +0200 | [diff] [blame] | 459 | if (state == PM_SUSPEND_FREEZE) { |
| 460 | #ifdef CONFIG_PM_DEBUG |
| 461 | if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) { |
| 462 | pr_warning("PM: Unsupported test mode for freeze state," |
| 463 | "please choose none/freezer/devices/platform.\n"); |
| 464 | return -EAGAIN; |
| 465 | } |
| 466 | #endif |
| 467 | } else if (!valid_state(state)) { |
| 468 | return -EINVAL; |
| 469 | } |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 470 | if (!mutex_trylock(&pm_mutex)) |
| 471 | return -EBUSY; |
| 472 | |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 473 | if (state == PM_SUSPEND_FREEZE) |
| 474 | freeze_begin(); |
| 475 | |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 476 | trace_suspend_resume(TPS("sync_filesystems"), 0, true); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 477 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
| 478 | sys_sync(); |
| 479 | printk("done.\n"); |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 480 | trace_suspend_resume(TPS("sync_filesystems"), 0, false); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 481 | |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 482 | pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); |
Zhang Rui | 7e73c5a | 2013-02-06 13:00:36 +0100 | [diff] [blame] | 483 | error = suspend_prepare(state); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 484 | if (error) |
| 485 | goto Unlock; |
| 486 | |
| 487 | if (suspend_test(TEST_FREEZER)) |
| 488 | goto Finish; |
| 489 | |
Todd E Brandt | bb3632c | 2014-06-06 05:40:17 -0700 | [diff] [blame] | 490 | trace_suspend_resume(TPS("suspend_enter"), state, false); |
Rafael J. Wysocki | d431cbc | 2014-07-15 22:02:11 +0200 | [diff] [blame] | 491 | pr_debug("PM: Entering %s sleep\n", pm_states[state]); |
Rafael J. Wysocki | 8718647 | 2011-05-10 21:09:53 +0200 | [diff] [blame] | 492 | pm_restrict_gfp_mask(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 493 | error = suspend_devices_and_enter(state); |
Rafael J. Wysocki | 8718647 | 2011-05-10 21:09:53 +0200 | [diff] [blame] | 494 | pm_restore_gfp_mask(); |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 495 | |
| 496 | Finish: |
| 497 | pr_debug("PM: Finishing wakeup.\n"); |
| 498 | suspend_finish(); |
| 499 | Unlock: |
| 500 | mutex_unlock(&pm_mutex); |
| 501 | return error; |
| 502 | } |
| 503 | |
| 504 | /** |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 505 | * pm_suspend - Externally visible function for suspending the system. |
| 506 | * @state: System sleep state to enter. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 507 | * |
Rafael J. Wysocki | 55ae451 | 2012-02-13 16:29:14 +0100 | [diff] [blame] | 508 | * Check if the value of @state represents one of the supported states, |
| 509 | * execute enter_state() and update system suspend statistics. |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 510 | */ |
| 511 | int pm_suspend(suspend_state_t state) |
| 512 | { |
Rafael J. Wysocki | bc25cf5 | 2012-02-13 16:29:33 +0100 | [diff] [blame] | 513 | int error; |
| 514 | |
| 515 | if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) |
| 516 | return -EINVAL; |
| 517 | |
| 518 | error = enter_state(state); |
| 519 | if (error) { |
| 520 | suspend_stats.fail++; |
| 521 | dpm_save_failed_errno(error); |
| 522 | } else { |
| 523 | suspend_stats.success++; |
ShuoX Liu | 2a77c46 | 2011-08-10 23:01:26 +0200 | [diff] [blame] | 524 | } |
Rafael J. Wysocki | bc25cf5 | 2012-02-13 16:29:33 +0100 | [diff] [blame] | 525 | return error; |
Rafael J. Wysocki | a9d7052 | 2009-06-10 01:27:12 +0200 | [diff] [blame] | 526 | } |
| 527 | EXPORT_SYMBOL(pm_suspend); |