| 1 | /* |
| 2 | * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support. |
| 3 | * |
| 4 | * Copyright (c) 2003 Patrick Mochel |
| 5 | * Copyright (c) 2003 Open Source Development Lab |
| 6 | * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz> |
| 7 | * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc. |
| 8 | * |
| 9 | * This file is released under the GPLv2. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/suspend.h> |
| 13 | #include <linux/syscalls.h> |
| 14 | #include <linux/reboot.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/async.h> |
| 18 | #include <linux/kmod.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/fs.h> |
| 21 | #include <linux/mount.h> |
| 22 | #include <linux/pm.h> |
| 23 | #include <linux/console.h> |
| 24 | #include <linux/cpu.h> |
| 25 | #include <linux/freezer.h> |
| 26 | #include <linux/gfp.h> |
| 27 | #include <linux/syscore_ops.h> |
| 28 | #include <scsi/scsi_scan.h> |
| 29 | |
| 30 | #include "power.h" |
| 31 | |
| 32 | |
| 33 | static int nocompress = 0; |
| 34 | static int noresume = 0; |
| 35 | static int resume_wait = 0; |
| 36 | static char resume_file[256] = CONFIG_PM_STD_PARTITION; |
| 37 | dev_t swsusp_resume_device; |
| 38 | sector_t swsusp_resume_block; |
| 39 | int in_suspend __nosavedata = 0; |
| 40 | |
| 41 | enum { |
| 42 | HIBERNATION_INVALID, |
| 43 | HIBERNATION_PLATFORM, |
| 44 | HIBERNATION_TEST, |
| 45 | HIBERNATION_TESTPROC, |
| 46 | HIBERNATION_SHUTDOWN, |
| 47 | HIBERNATION_REBOOT, |
| 48 | /* keep last */ |
| 49 | __HIBERNATION_AFTER_LAST |
| 50 | }; |
| 51 | #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1) |
| 52 | #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1) |
| 53 | |
| 54 | static int hibernation_mode = HIBERNATION_SHUTDOWN; |
| 55 | |
| 56 | static const struct platform_hibernation_ops *hibernation_ops; |
| 57 | |
| 58 | /** |
| 59 | * hibernation_set_ops - Set the global hibernate operations. |
| 60 | * @ops: Hibernation operations to use in subsequent hibernation transitions. |
| 61 | */ |
| 62 | void hibernation_set_ops(const struct platform_hibernation_ops *ops) |
| 63 | { |
| 64 | if (ops && !(ops->begin && ops->end && ops->pre_snapshot |
| 65 | && ops->prepare && ops->finish && ops->enter && ops->pre_restore |
| 66 | && ops->restore_cleanup && ops->leave)) { |
| 67 | WARN_ON(1); |
| 68 | return; |
| 69 | } |
| 70 | mutex_lock(&pm_mutex); |
| 71 | hibernation_ops = ops; |
| 72 | if (ops) |
| 73 | hibernation_mode = HIBERNATION_PLATFORM; |
| 74 | else if (hibernation_mode == HIBERNATION_PLATFORM) |
| 75 | hibernation_mode = HIBERNATION_SHUTDOWN; |
| 76 | |
| 77 | mutex_unlock(&pm_mutex); |
| 78 | } |
| 79 | |
| 80 | static bool entering_platform_hibernation; |
| 81 | |
| 82 | bool system_entering_hibernation(void) |
| 83 | { |
| 84 | return entering_platform_hibernation; |
| 85 | } |
| 86 | EXPORT_SYMBOL(system_entering_hibernation); |
| 87 | |
| 88 | #ifdef CONFIG_PM_DEBUG |
| 89 | static void hibernation_debug_sleep(void) |
| 90 | { |
| 91 | printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n"); |
| 92 | mdelay(5000); |
| 93 | } |
| 94 | |
| 95 | static int hibernation_testmode(int mode) |
| 96 | { |
| 97 | if (hibernation_mode == mode) { |
| 98 | hibernation_debug_sleep(); |
| 99 | return 1; |
| 100 | } |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static int hibernation_test(int level) |
| 105 | { |
| 106 | if (pm_test_level == level) { |
| 107 | hibernation_debug_sleep(); |
| 108 | return 1; |
| 109 | } |
| 110 | return 0; |
| 111 | } |
| 112 | #else /* !CONFIG_PM_DEBUG */ |
| 113 | static int hibernation_testmode(int mode) { return 0; } |
| 114 | static int hibernation_test(int level) { return 0; } |
| 115 | #endif /* !CONFIG_PM_DEBUG */ |
| 116 | |
| 117 | /** |
| 118 | * platform_begin - Call platform to start hibernation. |
| 119 | * @platform_mode: Whether or not to use the platform driver. |
| 120 | */ |
| 121 | static int platform_begin(int platform_mode) |
| 122 | { |
| 123 | return (platform_mode && hibernation_ops) ? |
| 124 | hibernation_ops->begin() : 0; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * platform_end - Call platform to finish transition to the working state. |
| 129 | * @platform_mode: Whether or not to use the platform driver. |
| 130 | */ |
| 131 | static void platform_end(int platform_mode) |
| 132 | { |
| 133 | if (platform_mode && hibernation_ops) |
| 134 | hibernation_ops->end(); |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * platform_pre_snapshot - Call platform to prepare the machine for hibernation. |
| 139 | * @platform_mode: Whether or not to use the platform driver. |
| 140 | * |
| 141 | * Use the platform driver to prepare the system for creating a hibernate image, |
| 142 | * if so configured, and return an error code if that fails. |
| 143 | */ |
| 144 | |
| 145 | static int platform_pre_snapshot(int platform_mode) |
| 146 | { |
| 147 | return (platform_mode && hibernation_ops) ? |
| 148 | hibernation_ops->pre_snapshot() : 0; |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * platform_leave - Call platform to prepare a transition to the working state. |
| 153 | * @platform_mode: Whether or not to use the platform driver. |
| 154 | * |
| 155 | * Use the platform driver prepare to prepare the machine for switching to the |
| 156 | * normal mode of operation. |
| 157 | * |
| 158 | * This routine is called on one CPU with interrupts disabled. |
| 159 | */ |
| 160 | static void platform_leave(int platform_mode) |
| 161 | { |
| 162 | if (platform_mode && hibernation_ops) |
| 163 | hibernation_ops->leave(); |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * platform_finish - Call platform to switch the system to the working state. |
| 168 | * @platform_mode: Whether or not to use the platform driver. |
| 169 | * |
| 170 | * Use the platform driver to switch the machine to the normal mode of |
| 171 | * operation. |
| 172 | * |
| 173 | * This routine must be called after platform_prepare(). |
| 174 | */ |
| 175 | static void platform_finish(int platform_mode) |
| 176 | { |
| 177 | if (platform_mode && hibernation_ops) |
| 178 | hibernation_ops->finish(); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * platform_pre_restore - Prepare for hibernate image restoration. |
| 183 | * @platform_mode: Whether or not to use the platform driver. |
| 184 | * |
| 185 | * Use the platform driver to prepare the system for resume from a hibernation |
| 186 | * image. |
| 187 | * |
| 188 | * If the restore fails after this function has been called, |
| 189 | * platform_restore_cleanup() must be called. |
| 190 | */ |
| 191 | static int platform_pre_restore(int platform_mode) |
| 192 | { |
| 193 | return (platform_mode && hibernation_ops) ? |
| 194 | hibernation_ops->pre_restore() : 0; |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * platform_restore_cleanup - Switch to the working state after failing restore. |
| 199 | * @platform_mode: Whether or not to use the platform driver. |
| 200 | * |
| 201 | * Use the platform driver to switch the system to the normal mode of operation |
| 202 | * after a failing restore. |
| 203 | * |
| 204 | * If platform_pre_restore() has been called before the failing restore, this |
| 205 | * function must be called too, regardless of the result of |
| 206 | * platform_pre_restore(). |
| 207 | */ |
| 208 | static void platform_restore_cleanup(int platform_mode) |
| 209 | { |
| 210 | if (platform_mode && hibernation_ops) |
| 211 | hibernation_ops->restore_cleanup(); |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * platform_recover - Recover from a failure to suspend devices. |
| 216 | * @platform_mode: Whether or not to use the platform driver. |
| 217 | */ |
| 218 | static void platform_recover(int platform_mode) |
| 219 | { |
| 220 | if (platform_mode && hibernation_ops && hibernation_ops->recover) |
| 221 | hibernation_ops->recover(); |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * swsusp_show_speed - Print time elapsed between two events during hibernation. |
| 226 | * @start: Starting event. |
| 227 | * @stop: Final event. |
| 228 | * @nr_pages: Number of memory pages processed between @start and @stop. |
| 229 | * @msg: Additional diagnostic message to print. |
| 230 | */ |
| 231 | void swsusp_show_speed(struct timeval *start, struct timeval *stop, |
| 232 | unsigned nr_pages, char *msg) |
| 233 | { |
| 234 | s64 elapsed_centisecs64; |
| 235 | int centisecs; |
| 236 | int k; |
| 237 | int kps; |
| 238 | |
| 239 | elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start); |
| 240 | do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); |
| 241 | centisecs = elapsed_centisecs64; |
| 242 | if (centisecs == 0) |
| 243 | centisecs = 1; /* avoid div-by-zero */ |
| 244 | k = nr_pages * (PAGE_SIZE / 1024); |
| 245 | kps = (k * 100) / centisecs; |
| 246 | printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", |
| 247 | msg, k, |
| 248 | centisecs / 100, centisecs % 100, |
| 249 | kps / 1000, (kps % 1000) / 10); |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * create_image - Create a hibernation image. |
| 254 | * @platform_mode: Whether or not to use the platform driver. |
| 255 | * |
| 256 | * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image |
| 257 | * and execute the drivers' .thaw_noirq() callbacks. |
| 258 | * |
| 259 | * Control reappears in this routine after the subsequent restore. |
| 260 | */ |
| 261 | static int create_image(int platform_mode) |
| 262 | { |
| 263 | int error; |
| 264 | |
| 265 | error = dpm_suspend_noirq(PMSG_FREEZE); |
| 266 | if (error) { |
| 267 | printk(KERN_ERR "PM: Some devices failed to power down, " |
| 268 | "aborting hibernation\n"); |
| 269 | return error; |
| 270 | } |
| 271 | |
| 272 | error = platform_pre_snapshot(platform_mode); |
| 273 | if (error || hibernation_test(TEST_PLATFORM)) |
| 274 | goto Platform_finish; |
| 275 | |
| 276 | error = disable_nonboot_cpus(); |
| 277 | if (error || hibernation_test(TEST_CPUS) |
| 278 | || hibernation_testmode(HIBERNATION_TEST)) |
| 279 | goto Enable_cpus; |
| 280 | |
| 281 | local_irq_disable(); |
| 282 | |
| 283 | error = syscore_suspend(); |
| 284 | if (error) { |
| 285 | printk(KERN_ERR "PM: Some system devices failed to power down, " |
| 286 | "aborting hibernation\n"); |
| 287 | goto Enable_irqs; |
| 288 | } |
| 289 | |
| 290 | if (hibernation_test(TEST_CORE) || pm_wakeup_pending()) |
| 291 | goto Power_up; |
| 292 | |
| 293 | in_suspend = 1; |
| 294 | save_processor_state(); |
| 295 | error = swsusp_arch_suspend(); |
| 296 | if (error) |
| 297 | printk(KERN_ERR "PM: Error %d creating hibernation image\n", |
| 298 | error); |
| 299 | /* Restore control flow magically appears here */ |
| 300 | restore_processor_state(); |
| 301 | if (!in_suspend) { |
| 302 | events_check_enabled = false; |
| 303 | platform_leave(platform_mode); |
| 304 | } |
| 305 | |
| 306 | Power_up: |
| 307 | syscore_resume(); |
| 308 | |
| 309 | Enable_irqs: |
| 310 | local_irq_enable(); |
| 311 | |
| 312 | Enable_cpus: |
| 313 | enable_nonboot_cpus(); |
| 314 | |
| 315 | Platform_finish: |
| 316 | platform_finish(platform_mode); |
| 317 | |
| 318 | dpm_resume_noirq(in_suspend ? |
| 319 | (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); |
| 320 | |
| 321 | return error; |
| 322 | } |
| 323 | |
| 324 | /** |
| 325 | * hibernation_snapshot - Quiesce devices and create a hibernation image. |
| 326 | * @platform_mode: If set, use platform driver to prepare for the transition. |
| 327 | * |
| 328 | * This routine must be called with pm_mutex held. |
| 329 | */ |
| 330 | int hibernation_snapshot(int platform_mode) |
| 331 | { |
| 332 | pm_message_t msg = PMSG_RECOVER; |
| 333 | int error; |
| 334 | |
| 335 | error = platform_begin(platform_mode); |
| 336 | if (error) |
| 337 | goto Close; |
| 338 | |
| 339 | /* Preallocate image memory before shutting down devices. */ |
| 340 | error = hibernate_preallocate_memory(); |
| 341 | if (error) |
| 342 | goto Close; |
| 343 | |
| 344 | error = freeze_kernel_threads(); |
| 345 | if (error) |
| 346 | goto Close; |
| 347 | |
| 348 | error = dpm_prepare(PMSG_FREEZE); |
| 349 | if (error) |
| 350 | goto Complete_devices; |
| 351 | |
| 352 | suspend_console(); |
| 353 | pm_restrict_gfp_mask(); |
| 354 | error = dpm_suspend(PMSG_FREEZE); |
| 355 | if (error) |
| 356 | goto Recover_platform; |
| 357 | |
| 358 | if (hibernation_test(TEST_DEVICES)) |
| 359 | goto Recover_platform; |
| 360 | |
| 361 | error = create_image(platform_mode); |
| 362 | /* |
| 363 | * Control returns here (1) after the image has been created or the |
| 364 | * image creation has failed and (2) after a successful restore. |
| 365 | */ |
| 366 | |
| 367 | Resume_devices: |
| 368 | /* We may need to release the preallocated image pages here. */ |
| 369 | if (error || !in_suspend) |
| 370 | swsusp_free(); |
| 371 | |
| 372 | msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE; |
| 373 | dpm_resume(msg); |
| 374 | |
| 375 | if (error || !in_suspend) |
| 376 | pm_restore_gfp_mask(); |
| 377 | |
| 378 | resume_console(); |
| 379 | |
| 380 | Complete_devices: |
| 381 | dpm_complete(msg); |
| 382 | |
| 383 | Close: |
| 384 | platform_end(platform_mode); |
| 385 | return error; |
| 386 | |
| 387 | Recover_platform: |
| 388 | platform_recover(platform_mode); |
| 389 | goto Resume_devices; |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * resume_target_kernel - Restore system state from a hibernation image. |
| 394 | * @platform_mode: Whether or not to use the platform driver. |
| 395 | * |
| 396 | * Execute device drivers' .freeze_noirq() callbacks, restore the contents of |
| 397 | * highmem that have not been restored yet from the image and run the low-level |
| 398 | * code that will restore the remaining contents of memory and switch to the |
| 399 | * just restored target kernel. |
| 400 | */ |
| 401 | static int resume_target_kernel(bool platform_mode) |
| 402 | { |
| 403 | int error; |
| 404 | |
| 405 | error = dpm_suspend_noirq(PMSG_QUIESCE); |
| 406 | if (error) { |
| 407 | printk(KERN_ERR "PM: Some devices failed to power down, " |
| 408 | "aborting resume\n"); |
| 409 | return error; |
| 410 | } |
| 411 | |
| 412 | error = platform_pre_restore(platform_mode); |
| 413 | if (error) |
| 414 | goto Cleanup; |
| 415 | |
| 416 | error = disable_nonboot_cpus(); |
| 417 | if (error) |
| 418 | goto Enable_cpus; |
| 419 | |
| 420 | local_irq_disable(); |
| 421 | |
| 422 | error = syscore_suspend(); |
| 423 | if (error) |
| 424 | goto Enable_irqs; |
| 425 | |
| 426 | save_processor_state(); |
| 427 | error = restore_highmem(); |
| 428 | if (!error) { |
| 429 | error = swsusp_arch_resume(); |
| 430 | /* |
| 431 | * The code below is only ever reached in case of a failure. |
| 432 | * Otherwise, execution continues at the place where |
| 433 | * swsusp_arch_suspend() was called. |
| 434 | */ |
| 435 | BUG_ON(!error); |
| 436 | /* |
| 437 | * This call to restore_highmem() reverts the changes made by |
| 438 | * the previous one. |
| 439 | */ |
| 440 | restore_highmem(); |
| 441 | } |
| 442 | /* |
| 443 | * The only reason why swsusp_arch_resume() can fail is memory being |
| 444 | * very tight, so we have to free it as soon as we can to avoid |
| 445 | * subsequent failures. |
| 446 | */ |
| 447 | swsusp_free(); |
| 448 | restore_processor_state(); |
| 449 | touch_softlockup_watchdog(); |
| 450 | |
| 451 | syscore_resume(); |
| 452 | |
| 453 | Enable_irqs: |
| 454 | local_irq_enable(); |
| 455 | |
| 456 | Enable_cpus: |
| 457 | enable_nonboot_cpus(); |
| 458 | |
| 459 | Cleanup: |
| 460 | platform_restore_cleanup(platform_mode); |
| 461 | |
| 462 | dpm_resume_noirq(PMSG_RECOVER); |
| 463 | |
| 464 | return error; |
| 465 | } |
| 466 | |
| 467 | /** |
| 468 | * hibernation_restore - Quiesce devices and restore from a hibernation image. |
| 469 | * @platform_mode: If set, use platform driver to prepare for the transition. |
| 470 | * |
| 471 | * This routine must be called with pm_mutex held. If it is successful, control |
| 472 | * reappears in the restored target kernel in hibernation_snapshot(). |
| 473 | */ |
| 474 | int hibernation_restore(int platform_mode) |
| 475 | { |
| 476 | int error; |
| 477 | |
| 478 | pm_prepare_console(); |
| 479 | suspend_console(); |
| 480 | pm_restrict_gfp_mask(); |
| 481 | error = dpm_suspend_start(PMSG_QUIESCE); |
| 482 | if (!error) { |
| 483 | error = resume_target_kernel(platform_mode); |
| 484 | dpm_resume_end(PMSG_RECOVER); |
| 485 | } |
| 486 | pm_restore_gfp_mask(); |
| 487 | resume_console(); |
| 488 | pm_restore_console(); |
| 489 | return error; |
| 490 | } |
| 491 | |
| 492 | /** |
| 493 | * hibernation_platform_enter - Power off the system using the platform driver. |
| 494 | */ |
| 495 | int hibernation_platform_enter(void) |
| 496 | { |
| 497 | int error; |
| 498 | |
| 499 | if (!hibernation_ops) |
| 500 | return -ENOSYS; |
| 501 | |
| 502 | /* |
| 503 | * We have cancelled the power transition by running |
| 504 | * hibernation_ops->finish() before saving the image, so we should let |
| 505 | * the firmware know that we're going to enter the sleep state after all |
| 506 | */ |
| 507 | error = hibernation_ops->begin(); |
| 508 | if (error) |
| 509 | goto Close; |
| 510 | |
| 511 | entering_platform_hibernation = true; |
| 512 | suspend_console(); |
| 513 | error = dpm_suspend_start(PMSG_HIBERNATE); |
| 514 | if (error) { |
| 515 | if (hibernation_ops->recover) |
| 516 | hibernation_ops->recover(); |
| 517 | goto Resume_devices; |
| 518 | } |
| 519 | |
| 520 | error = dpm_suspend_noirq(PMSG_HIBERNATE); |
| 521 | if (error) |
| 522 | goto Resume_devices; |
| 523 | |
| 524 | error = hibernation_ops->prepare(); |
| 525 | if (error) |
| 526 | goto Platform_finish; |
| 527 | |
| 528 | error = disable_nonboot_cpus(); |
| 529 | if (error) |
| 530 | goto Platform_finish; |
| 531 | |
| 532 | local_irq_disable(); |
| 533 | syscore_suspend(); |
| 534 | if (pm_wakeup_pending()) { |
| 535 | error = -EAGAIN; |
| 536 | goto Power_up; |
| 537 | } |
| 538 | |
| 539 | hibernation_ops->enter(); |
| 540 | /* We should never get here */ |
| 541 | while (1); |
| 542 | |
| 543 | Power_up: |
| 544 | syscore_resume(); |
| 545 | local_irq_enable(); |
| 546 | enable_nonboot_cpus(); |
| 547 | |
| 548 | Platform_finish: |
| 549 | hibernation_ops->finish(); |
| 550 | |
| 551 | dpm_resume_noirq(PMSG_RESTORE); |
| 552 | |
| 553 | Resume_devices: |
| 554 | entering_platform_hibernation = false; |
| 555 | dpm_resume_end(PMSG_RESTORE); |
| 556 | resume_console(); |
| 557 | |
| 558 | Close: |
| 559 | hibernation_ops->end(); |
| 560 | |
| 561 | return error; |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * power_down - Shut the machine down for hibernation. |
| 566 | * |
| 567 | * Use the platform driver, if configured, to put the system into the sleep |
| 568 | * state corresponding to hibernation, or try to power it off or reboot, |
| 569 | * depending on the value of hibernation_mode. |
| 570 | */ |
| 571 | static void power_down(void) |
| 572 | { |
| 573 | switch (hibernation_mode) { |
| 574 | case HIBERNATION_TEST: |
| 575 | case HIBERNATION_TESTPROC: |
| 576 | break; |
| 577 | case HIBERNATION_REBOOT: |
| 578 | kernel_restart(NULL); |
| 579 | break; |
| 580 | case HIBERNATION_PLATFORM: |
| 581 | hibernation_platform_enter(); |
| 582 | case HIBERNATION_SHUTDOWN: |
| 583 | kernel_power_off(); |
| 584 | break; |
| 585 | } |
| 586 | kernel_halt(); |
| 587 | /* |
| 588 | * Valid image is on the disk, if we continue we risk serious data |
| 589 | * corruption after resume. |
| 590 | */ |
| 591 | printk(KERN_CRIT "PM: Please power down manually\n"); |
| 592 | while(1); |
| 593 | } |
| 594 | |
| 595 | static int prepare_processes(void) |
| 596 | { |
| 597 | int error = 0; |
| 598 | |
| 599 | if (freeze_processes()) { |
| 600 | error = -EBUSY; |
| 601 | thaw_processes(); |
| 602 | } |
| 603 | return error; |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * hibernate - Carry out system hibernation, including saving the image. |
| 608 | */ |
| 609 | int hibernate(void) |
| 610 | { |
| 611 | int error; |
| 612 | |
| 613 | mutex_lock(&pm_mutex); |
| 614 | /* The snapshot device should not be opened while we're running */ |
| 615 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
| 616 | error = -EBUSY; |
| 617 | goto Unlock; |
| 618 | } |
| 619 | |
| 620 | pm_prepare_console(); |
| 621 | error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); |
| 622 | if (error) |
| 623 | goto Exit; |
| 624 | |
| 625 | error = usermodehelper_disable(); |
| 626 | if (error) |
| 627 | goto Exit; |
| 628 | |
| 629 | /* Allocate memory management structures */ |
| 630 | error = create_basic_memory_bitmaps(); |
| 631 | if (error) |
| 632 | goto Exit; |
| 633 | |
| 634 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
| 635 | sys_sync(); |
| 636 | printk("done.\n"); |
| 637 | |
| 638 | error = prepare_processes(); |
| 639 | if (error) |
| 640 | goto Finish; |
| 641 | |
| 642 | if (hibernation_test(TEST_FREEZER)) |
| 643 | goto Thaw; |
| 644 | |
| 645 | if (hibernation_testmode(HIBERNATION_TESTPROC)) |
| 646 | goto Thaw; |
| 647 | |
| 648 | error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); |
| 649 | if (error) |
| 650 | goto Thaw; |
| 651 | |
| 652 | if (in_suspend) { |
| 653 | unsigned int flags = 0; |
| 654 | |
| 655 | if (hibernation_mode == HIBERNATION_PLATFORM) |
| 656 | flags |= SF_PLATFORM_MODE; |
| 657 | if (nocompress) |
| 658 | flags |= SF_NOCOMPRESS_MODE; |
| 659 | pr_debug("PM: writing image.\n"); |
| 660 | error = swsusp_write(flags); |
| 661 | swsusp_free(); |
| 662 | if (!error) |
| 663 | power_down(); |
| 664 | in_suspend = 0; |
| 665 | pm_restore_gfp_mask(); |
| 666 | } else { |
| 667 | pr_debug("PM: Image restored successfully.\n"); |
| 668 | } |
| 669 | |
| 670 | Thaw: |
| 671 | thaw_processes(); |
| 672 | Finish: |
| 673 | free_basic_memory_bitmaps(); |
| 674 | usermodehelper_enable(); |
| 675 | Exit: |
| 676 | pm_notifier_call_chain(PM_POST_HIBERNATION); |
| 677 | pm_restore_console(); |
| 678 | atomic_inc(&snapshot_device_available); |
| 679 | Unlock: |
| 680 | mutex_unlock(&pm_mutex); |
| 681 | return error; |
| 682 | } |
| 683 | |
| 684 | |
| 685 | /** |
| 686 | * software_resume - Resume from a saved hibernation image. |
| 687 | * |
| 688 | * This routine is called as a late initcall, when all devices have been |
| 689 | * discovered and initialized already. |
| 690 | * |
| 691 | * The image reading code is called to see if there is a hibernation image |
| 692 | * available for reading. If that is the case, devices are quiesced and the |
| 693 | * contents of memory is restored from the saved image. |
| 694 | * |
| 695 | * If this is successful, control reappears in the restored target kernel in |
| 696 | * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine |
| 697 | * attempts to recover gracefully and make the kernel return to the normal mode |
| 698 | * of operation. |
| 699 | */ |
| 700 | static int software_resume(void) |
| 701 | { |
| 702 | int error; |
| 703 | unsigned int flags; |
| 704 | |
| 705 | /* |
| 706 | * If the user said "noresume".. bail out early. |
| 707 | */ |
| 708 | if (noresume) |
| 709 | return 0; |
| 710 | |
| 711 | /* |
| 712 | * name_to_dev_t() below takes a sysfs buffer mutex when sysfs |
| 713 | * is configured into the kernel. Since the regular hibernate |
| 714 | * trigger path is via sysfs which takes a buffer mutex before |
| 715 | * calling hibernate functions (which take pm_mutex) this can |
| 716 | * cause lockdep to complain about a possible ABBA deadlock |
| 717 | * which cannot happen since we're in the boot code here and |
| 718 | * sysfs can't be invoked yet. Therefore, we use a subclass |
| 719 | * here to avoid lockdep complaining. |
| 720 | */ |
| 721 | mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); |
| 722 | |
| 723 | if (swsusp_resume_device) |
| 724 | goto Check_image; |
| 725 | |
| 726 | if (!strlen(resume_file)) { |
| 727 | error = -ENOENT; |
| 728 | goto Unlock; |
| 729 | } |
| 730 | |
| 731 | pr_debug("PM: Checking hibernation image partition %s\n", resume_file); |
| 732 | |
| 733 | /* Check if the device is there */ |
| 734 | swsusp_resume_device = name_to_dev_t(resume_file); |
| 735 | if (!swsusp_resume_device) { |
| 736 | /* |
| 737 | * Some device discovery might still be in progress; we need |
| 738 | * to wait for this to finish. |
| 739 | */ |
| 740 | wait_for_device_probe(); |
| 741 | |
| 742 | if (resume_wait) { |
| 743 | while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) |
| 744 | msleep(10); |
| 745 | async_synchronize_full(); |
| 746 | } |
| 747 | |
| 748 | /* |
| 749 | * We can't depend on SCSI devices being available after loading |
| 750 | * one of their modules until scsi_complete_async_scans() is |
| 751 | * called and the resume device usually is a SCSI one. |
| 752 | */ |
| 753 | scsi_complete_async_scans(); |
| 754 | |
| 755 | swsusp_resume_device = name_to_dev_t(resume_file); |
| 756 | if (!swsusp_resume_device) { |
| 757 | error = -ENODEV; |
| 758 | goto Unlock; |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | Check_image: |
| 763 | pr_debug("PM: Hibernation image partition %d:%d present\n", |
| 764 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); |
| 765 | |
| 766 | pr_debug("PM: Looking for hibernation image.\n"); |
| 767 | error = swsusp_check(); |
| 768 | if (error) |
| 769 | goto Unlock; |
| 770 | |
| 771 | /* The snapshot device should not be opened while we're running */ |
| 772 | if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { |
| 773 | error = -EBUSY; |
| 774 | swsusp_close(FMODE_READ); |
| 775 | goto Unlock; |
| 776 | } |
| 777 | |
| 778 | pm_prepare_console(); |
| 779 | error = pm_notifier_call_chain(PM_RESTORE_PREPARE); |
| 780 | if (error) |
| 781 | goto close_finish; |
| 782 | |
| 783 | error = usermodehelper_disable(); |
| 784 | if (error) |
| 785 | goto close_finish; |
| 786 | |
| 787 | error = create_basic_memory_bitmaps(); |
| 788 | if (error) |
| 789 | goto close_finish; |
| 790 | |
| 791 | pr_debug("PM: Preparing processes for restore.\n"); |
| 792 | error = prepare_processes(); |
| 793 | if (error) { |
| 794 | swsusp_close(FMODE_READ); |
| 795 | goto Done; |
| 796 | } |
| 797 | |
| 798 | pr_debug("PM: Loading hibernation image.\n"); |
| 799 | |
| 800 | error = swsusp_read(&flags); |
| 801 | swsusp_close(FMODE_READ); |
| 802 | if (!error) |
| 803 | hibernation_restore(flags & SF_PLATFORM_MODE); |
| 804 | |
| 805 | printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); |
| 806 | swsusp_free(); |
| 807 | thaw_processes(); |
| 808 | Done: |
| 809 | free_basic_memory_bitmaps(); |
| 810 | usermodehelper_enable(); |
| 811 | Finish: |
| 812 | pm_notifier_call_chain(PM_POST_RESTORE); |
| 813 | pm_restore_console(); |
| 814 | atomic_inc(&snapshot_device_available); |
| 815 | /* For success case, the suspend path will release the lock */ |
| 816 | Unlock: |
| 817 | mutex_unlock(&pm_mutex); |
| 818 | pr_debug("PM: Hibernation image not present or could not be loaded.\n"); |
| 819 | return error; |
| 820 | close_finish: |
| 821 | swsusp_close(FMODE_READ); |
| 822 | goto Finish; |
| 823 | } |
| 824 | |
| 825 | late_initcall(software_resume); |
| 826 | |
| 827 | |
| 828 | static const char * const hibernation_modes[] = { |
| 829 | [HIBERNATION_PLATFORM] = "platform", |
| 830 | [HIBERNATION_SHUTDOWN] = "shutdown", |
| 831 | [HIBERNATION_REBOOT] = "reboot", |
| 832 | [HIBERNATION_TEST] = "test", |
| 833 | [HIBERNATION_TESTPROC] = "testproc", |
| 834 | }; |
| 835 | |
| 836 | /* |
| 837 | * /sys/power/disk - Control hibernation mode. |
| 838 | * |
| 839 | * Hibernation can be handled in several ways. There are a few different ways |
| 840 | * to put the system into the sleep state: using the platform driver (e.g. ACPI |
| 841 | * or other hibernation_ops), powering it off or rebooting it (for testing |
| 842 | * mostly), or using one of the two available test modes. |
| 843 | * |
| 844 | * The sysfs file /sys/power/disk provides an interface for selecting the |
| 845 | * hibernation mode to use. Reading from this file causes the available modes |
| 846 | * to be printed. There are 5 modes that can be supported: |
| 847 | * |
| 848 | * 'platform' |
| 849 | * 'shutdown' |
| 850 | * 'reboot' |
| 851 | * 'test' |
| 852 | * 'testproc' |
| 853 | * |
| 854 | * If a platform hibernation driver is in use, 'platform' will be supported |
| 855 | * and will be used by default. Otherwise, 'shutdown' will be used by default. |
| 856 | * The selected option (i.e. the one corresponding to the current value of |
| 857 | * hibernation_mode) is enclosed by a square bracket. |
| 858 | * |
| 859 | * To select a given hibernation mode it is necessary to write the mode's |
| 860 | * string representation (as returned by reading from /sys/power/disk) back |
| 861 | * into /sys/power/disk. |
| 862 | */ |
| 863 | |
| 864 | static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 865 | char *buf) |
| 866 | { |
| 867 | int i; |
| 868 | char *start = buf; |
| 869 | |
| 870 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
| 871 | if (!hibernation_modes[i]) |
| 872 | continue; |
| 873 | switch (i) { |
| 874 | case HIBERNATION_SHUTDOWN: |
| 875 | case HIBERNATION_REBOOT: |
| 876 | case HIBERNATION_TEST: |
| 877 | case HIBERNATION_TESTPROC: |
| 878 | break; |
| 879 | case HIBERNATION_PLATFORM: |
| 880 | if (hibernation_ops) |
| 881 | break; |
| 882 | /* not a valid mode, continue with loop */ |
| 883 | continue; |
| 884 | } |
| 885 | if (i == hibernation_mode) |
| 886 | buf += sprintf(buf, "[%s] ", hibernation_modes[i]); |
| 887 | else |
| 888 | buf += sprintf(buf, "%s ", hibernation_modes[i]); |
| 889 | } |
| 890 | buf += sprintf(buf, "\n"); |
| 891 | return buf-start; |
| 892 | } |
| 893 | |
| 894 | static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 895 | const char *buf, size_t n) |
| 896 | { |
| 897 | int error = 0; |
| 898 | int i; |
| 899 | int len; |
| 900 | char *p; |
| 901 | int mode = HIBERNATION_INVALID; |
| 902 | |
| 903 | p = memchr(buf, '\n', n); |
| 904 | len = p ? p - buf : n; |
| 905 | |
| 906 | mutex_lock(&pm_mutex); |
| 907 | for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { |
| 908 | if (len == strlen(hibernation_modes[i]) |
| 909 | && !strncmp(buf, hibernation_modes[i], len)) { |
| 910 | mode = i; |
| 911 | break; |
| 912 | } |
| 913 | } |
| 914 | if (mode != HIBERNATION_INVALID) { |
| 915 | switch (mode) { |
| 916 | case HIBERNATION_SHUTDOWN: |
| 917 | case HIBERNATION_REBOOT: |
| 918 | case HIBERNATION_TEST: |
| 919 | case HIBERNATION_TESTPROC: |
| 920 | hibernation_mode = mode; |
| 921 | break; |
| 922 | case HIBERNATION_PLATFORM: |
| 923 | if (hibernation_ops) |
| 924 | hibernation_mode = mode; |
| 925 | else |
| 926 | error = -EINVAL; |
| 927 | } |
| 928 | } else |
| 929 | error = -EINVAL; |
| 930 | |
| 931 | if (!error) |
| 932 | pr_debug("PM: Hibernation mode set to '%s'\n", |
| 933 | hibernation_modes[mode]); |
| 934 | mutex_unlock(&pm_mutex); |
| 935 | return error ? error : n; |
| 936 | } |
| 937 | |
| 938 | power_attr(disk); |
| 939 | |
| 940 | static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 941 | char *buf) |
| 942 | { |
| 943 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), |
| 944 | MINOR(swsusp_resume_device)); |
| 945 | } |
| 946 | |
| 947 | static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 948 | const char *buf, size_t n) |
| 949 | { |
| 950 | unsigned int maj, min; |
| 951 | dev_t res; |
| 952 | int ret = -EINVAL; |
| 953 | |
| 954 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
| 955 | goto out; |
| 956 | |
| 957 | res = MKDEV(maj,min); |
| 958 | if (maj != MAJOR(res) || min != MINOR(res)) |
| 959 | goto out; |
| 960 | |
| 961 | mutex_lock(&pm_mutex); |
| 962 | swsusp_resume_device = res; |
| 963 | mutex_unlock(&pm_mutex); |
| 964 | printk(KERN_INFO "PM: Starting manual resume from disk\n"); |
| 965 | noresume = 0; |
| 966 | software_resume(); |
| 967 | ret = n; |
| 968 | out: |
| 969 | return ret; |
| 970 | } |
| 971 | |
| 972 | power_attr(resume); |
| 973 | |
| 974 | static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, |
| 975 | char *buf) |
| 976 | { |
| 977 | return sprintf(buf, "%lu\n", image_size); |
| 978 | } |
| 979 | |
| 980 | static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, |
| 981 | const char *buf, size_t n) |
| 982 | { |
| 983 | unsigned long size; |
| 984 | |
| 985 | if (sscanf(buf, "%lu", &size) == 1) { |
| 986 | image_size = size; |
| 987 | return n; |
| 988 | } |
| 989 | |
| 990 | return -EINVAL; |
| 991 | } |
| 992 | |
| 993 | power_attr(image_size); |
| 994 | |
| 995 | static ssize_t reserved_size_show(struct kobject *kobj, |
| 996 | struct kobj_attribute *attr, char *buf) |
| 997 | { |
| 998 | return sprintf(buf, "%lu\n", reserved_size); |
| 999 | } |
| 1000 | |
| 1001 | static ssize_t reserved_size_store(struct kobject *kobj, |
| 1002 | struct kobj_attribute *attr, |
| 1003 | const char *buf, size_t n) |
| 1004 | { |
| 1005 | unsigned long size; |
| 1006 | |
| 1007 | if (sscanf(buf, "%lu", &size) == 1) { |
| 1008 | reserved_size = size; |
| 1009 | return n; |
| 1010 | } |
| 1011 | |
| 1012 | return -EINVAL; |
| 1013 | } |
| 1014 | |
| 1015 | power_attr(reserved_size); |
| 1016 | |
| 1017 | static struct attribute * g[] = { |
| 1018 | &disk_attr.attr, |
| 1019 | &resume_attr.attr, |
| 1020 | &image_size_attr.attr, |
| 1021 | &reserved_size_attr.attr, |
| 1022 | NULL, |
| 1023 | }; |
| 1024 | |
| 1025 | |
| 1026 | static struct attribute_group attr_group = { |
| 1027 | .attrs = g, |
| 1028 | }; |
| 1029 | |
| 1030 | |
| 1031 | static int __init pm_disk_init(void) |
| 1032 | { |
| 1033 | return sysfs_create_group(power_kobj, &attr_group); |
| 1034 | } |
| 1035 | |
| 1036 | core_initcall(pm_disk_init); |
| 1037 | |
| 1038 | |
| 1039 | static int __init resume_setup(char *str) |
| 1040 | { |
| 1041 | if (noresume) |
| 1042 | return 1; |
| 1043 | |
| 1044 | strncpy( resume_file, str, 255 ); |
| 1045 | return 1; |
| 1046 | } |
| 1047 | |
| 1048 | static int __init resume_offset_setup(char *str) |
| 1049 | { |
| 1050 | unsigned long long offset; |
| 1051 | |
| 1052 | if (noresume) |
| 1053 | return 1; |
| 1054 | |
| 1055 | if (sscanf(str, "%llu", &offset) == 1) |
| 1056 | swsusp_resume_block = offset; |
| 1057 | |
| 1058 | return 1; |
| 1059 | } |
| 1060 | |
| 1061 | static int __init hibernate_setup(char *str) |
| 1062 | { |
| 1063 | if (!strncmp(str, "noresume", 8)) |
| 1064 | noresume = 1; |
| 1065 | else if (!strncmp(str, "nocompress", 10)) |
| 1066 | nocompress = 1; |
| 1067 | return 1; |
| 1068 | } |
| 1069 | |
| 1070 | static int __init noresume_setup(char *str) |
| 1071 | { |
| 1072 | noresume = 1; |
| 1073 | return 1; |
| 1074 | } |
| 1075 | |
| 1076 | static int __init resumewait_setup(char *str) |
| 1077 | { |
| 1078 | resume_wait = 1; |
| 1079 | return 1; |
| 1080 | } |
| 1081 | |
| 1082 | __setup("noresume", noresume_setup); |
| 1083 | __setup("resume_offset=", resume_offset_setup); |
| 1084 | __setup("resume=", resume_setup); |
| 1085 | __setup("hibernate=", hibernate_setup); |
| 1086 | __setup("resumewait", resumewait_setup); |