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Another round of SPDX header file fixes for 5.2-rc4 These are all more "GPL-2.0-or-later" or "GPL-2.0-only" tags being added, based on the text in the files. We are slowly chipping away at the 700+ different ways people tried to write the license text. All of these were reviewed on the spdx mailing list by a number of different people. We now have over 60% of the kernel files covered with SPDX tags: $ ./scripts/spdxcheck.py -v 2>&1 | grep Files Files checked: 64533 Files with SPDX: 40392 Files with errors: 0 I think the majority of the "easy" fixups are now done, it's now the start of the longer-tail of crazy variants to wade through. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- iG0EABECAC0WIQT0tgzFv3jCIUoxPcsxR9QN2y37KQUCXPuGTg8cZ3JlZ0Brcm9h aC5jb20ACgkQMUfUDdst+ykBvQCg2SG+HmDH+tlwKLT/q7jZcLMPQigAoMpt9Uuy sxVEiFZo8ZU9v1IoRb1I =qU++ -----END PGP SIGNATURE----- Merge tag 'spdx-5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull yet more SPDX updates from Greg KH: "Another round of SPDX header file fixes for 5.2-rc4 These are all more "GPL-2.0-or-later" or "GPL-2.0-only" tags being added, based on the text in the files. We are slowly chipping away at the 700+ different ways people tried to write the license text. All of these were reviewed on the spdx mailing list by a number of different people. We now have over 60% of the kernel files covered with SPDX tags: $ ./scripts/spdxcheck.py -v 2>&1 | grep Files Files checked: 64533 Files with SPDX: 40392 Files with errors: 0 I think the majority of the "easy" fixups are now done, it's now the start of the longer-tail of crazy variants to wade through" * tag 'spdx-5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (159 commits) treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 450 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 449 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 448 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 446 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 445 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 444 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 443 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 442 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 440 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 438 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 437 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 436 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 435 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 434 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 433 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 432 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 431 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 430 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 429 ...
1239 lines
29 KiB
C
1239 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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* Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
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* Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
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* Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
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*/
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#define pr_fmt(fmt) "PM: " fmt
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#include <linux/export.h>
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#include <linux/suspend.h>
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#include <linux/reboot.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/async.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/pm.h>
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#include <linux/nmi.h>
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#include <linux/console.h>
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#include <linux/cpu.h>
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#include <linux/freezer.h>
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#include <linux/gfp.h>
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#include <linux/syscore_ops.h>
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#include <linux/ctype.h>
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#include <linux/genhd.h>
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#include <linux/ktime.h>
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#include <trace/events/power.h>
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#include "power.h"
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static int nocompress;
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static int noresume;
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static int nohibernate;
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static int resume_wait;
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static unsigned int resume_delay;
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static char resume_file[256] = CONFIG_PM_STD_PARTITION;
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dev_t swsusp_resume_device;
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sector_t swsusp_resume_block;
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__visible int in_suspend __nosavedata;
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enum {
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HIBERNATION_INVALID,
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HIBERNATION_PLATFORM,
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HIBERNATION_SHUTDOWN,
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HIBERNATION_REBOOT,
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#ifdef CONFIG_SUSPEND
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HIBERNATION_SUSPEND,
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#endif
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HIBERNATION_TEST_RESUME,
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/* keep last */
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__HIBERNATION_AFTER_LAST
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};
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#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
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#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
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static int hibernation_mode = HIBERNATION_SHUTDOWN;
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bool freezer_test_done;
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static const struct platform_hibernation_ops *hibernation_ops;
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bool hibernation_available(void)
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{
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return (nohibernate == 0);
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}
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/**
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* hibernation_set_ops - Set the global hibernate operations.
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* @ops: Hibernation operations to use in subsequent hibernation transitions.
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*/
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void hibernation_set_ops(const struct platform_hibernation_ops *ops)
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{
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if (ops && !(ops->begin && ops->end && ops->pre_snapshot
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&& ops->prepare && ops->finish && ops->enter && ops->pre_restore
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&& ops->restore_cleanup && ops->leave)) {
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WARN_ON(1);
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return;
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}
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lock_system_sleep();
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hibernation_ops = ops;
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if (ops)
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hibernation_mode = HIBERNATION_PLATFORM;
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else if (hibernation_mode == HIBERNATION_PLATFORM)
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hibernation_mode = HIBERNATION_SHUTDOWN;
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unlock_system_sleep();
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}
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EXPORT_SYMBOL_GPL(hibernation_set_ops);
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static bool entering_platform_hibernation;
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bool system_entering_hibernation(void)
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{
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return entering_platform_hibernation;
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}
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EXPORT_SYMBOL(system_entering_hibernation);
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#ifdef CONFIG_PM_DEBUG
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static void hibernation_debug_sleep(void)
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{
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pr_info("hibernation debug: Waiting for 5 seconds.\n");
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mdelay(5000);
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}
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static int hibernation_test(int level)
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{
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if (pm_test_level == level) {
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hibernation_debug_sleep();
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return 1;
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}
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return 0;
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}
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#else /* !CONFIG_PM_DEBUG */
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static int hibernation_test(int level) { return 0; }
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#endif /* !CONFIG_PM_DEBUG */
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/**
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* platform_begin - Call platform to start hibernation.
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* @platform_mode: Whether or not to use the platform driver.
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*/
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static int platform_begin(int platform_mode)
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{
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return (platform_mode && hibernation_ops) ?
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hibernation_ops->begin(PMSG_FREEZE) : 0;
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}
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/**
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* platform_end - Call platform to finish transition to the working state.
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* @platform_mode: Whether or not to use the platform driver.
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*/
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static void platform_end(int platform_mode)
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{
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if (platform_mode && hibernation_ops)
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hibernation_ops->end();
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}
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/**
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* platform_pre_snapshot - Call platform to prepare the machine for hibernation.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver to prepare the system for creating a hibernate image,
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* if so configured, and return an error code if that fails.
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*/
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static int platform_pre_snapshot(int platform_mode)
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{
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return (platform_mode && hibernation_ops) ?
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hibernation_ops->pre_snapshot() : 0;
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}
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/**
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* platform_leave - Call platform to prepare a transition to the working state.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver prepare to prepare the machine for switching to the
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* normal mode of operation.
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*
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* This routine is called on one CPU with interrupts disabled.
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*/
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static void platform_leave(int platform_mode)
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{
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if (platform_mode && hibernation_ops)
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hibernation_ops->leave();
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}
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/**
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* platform_finish - Call platform to switch the system to the working state.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver to switch the machine to the normal mode of
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* operation.
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*
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* This routine must be called after platform_prepare().
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*/
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static void platform_finish(int platform_mode)
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{
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if (platform_mode && hibernation_ops)
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hibernation_ops->finish();
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}
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/**
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* platform_pre_restore - Prepare for hibernate image restoration.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver to prepare the system for resume from a hibernation
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* image.
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*
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* If the restore fails after this function has been called,
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* platform_restore_cleanup() must be called.
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*/
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static int platform_pre_restore(int platform_mode)
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{
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return (platform_mode && hibernation_ops) ?
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hibernation_ops->pre_restore() : 0;
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}
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/**
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* platform_restore_cleanup - Switch to the working state after failing restore.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Use the platform driver to switch the system to the normal mode of operation
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* after a failing restore.
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*
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* If platform_pre_restore() has been called before the failing restore, this
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* function must be called too, regardless of the result of
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* platform_pre_restore().
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*/
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static void platform_restore_cleanup(int platform_mode)
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{
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if (platform_mode && hibernation_ops)
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hibernation_ops->restore_cleanup();
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}
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/**
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* platform_recover - Recover from a failure to suspend devices.
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* @platform_mode: Whether or not to use the platform driver.
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*/
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static void platform_recover(int platform_mode)
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{
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if (platform_mode && hibernation_ops && hibernation_ops->recover)
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hibernation_ops->recover();
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}
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/**
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* swsusp_show_speed - Print time elapsed between two events during hibernation.
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* @start: Starting event.
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* @stop: Final event.
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* @nr_pages: Number of memory pages processed between @start and @stop.
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* @msg: Additional diagnostic message to print.
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*/
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void swsusp_show_speed(ktime_t start, ktime_t stop,
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unsigned nr_pages, char *msg)
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{
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ktime_t diff;
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u64 elapsed_centisecs64;
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unsigned int centisecs;
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unsigned int k;
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unsigned int kps;
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diff = ktime_sub(stop, start);
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elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
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centisecs = elapsed_centisecs64;
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if (centisecs == 0)
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centisecs = 1; /* avoid div-by-zero */
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k = nr_pages * (PAGE_SIZE / 1024);
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kps = (k * 100) / centisecs;
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pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
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msg, k, centisecs / 100, centisecs % 100, kps / 1000,
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(kps % 1000) / 10);
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}
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__weak int arch_resume_nosmt(void)
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{
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return 0;
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}
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/**
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* create_image - Create a hibernation image.
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* @platform_mode: Whether or not to use the platform driver.
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*
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* Execute device drivers' "late" and "noirq" freeze callbacks, create a
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* hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
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*
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* Control reappears in this routine after the subsequent restore.
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*/
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static int create_image(int platform_mode)
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{
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int error;
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error = dpm_suspend_end(PMSG_FREEZE);
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if (error) {
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pr_err("Some devices failed to power down, aborting hibernation\n");
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return error;
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}
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error = platform_pre_snapshot(platform_mode);
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if (error || hibernation_test(TEST_PLATFORM))
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goto Platform_finish;
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error = suspend_disable_secondary_cpus();
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if (error || hibernation_test(TEST_CPUS))
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goto Enable_cpus;
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local_irq_disable();
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system_state = SYSTEM_SUSPEND;
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error = syscore_suspend();
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if (error) {
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pr_err("Some system devices failed to power down, aborting hibernation\n");
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goto Enable_irqs;
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}
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if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
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goto Power_up;
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in_suspend = 1;
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save_processor_state();
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trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
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error = swsusp_arch_suspend();
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/* Restore control flow magically appears here */
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restore_processor_state();
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trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
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if (error)
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pr_err("Error %d creating hibernation image\n", error);
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if (!in_suspend) {
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events_check_enabled = false;
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clear_free_pages();
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}
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platform_leave(platform_mode);
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Power_up:
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syscore_resume();
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Enable_irqs:
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system_state = SYSTEM_RUNNING;
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local_irq_enable();
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Enable_cpus:
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suspend_enable_secondary_cpus();
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/* Allow architectures to do nosmt-specific post-resume dances */
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if (!in_suspend)
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error = arch_resume_nosmt();
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Platform_finish:
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platform_finish(platform_mode);
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dpm_resume_start(in_suspend ?
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(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
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return error;
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}
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/**
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* hibernation_snapshot - Quiesce devices and create a hibernation image.
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* @platform_mode: If set, use platform driver to prepare for the transition.
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*
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* This routine must be called with system_transition_mutex held.
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*/
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int hibernation_snapshot(int platform_mode)
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{
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pm_message_t msg;
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int error;
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pm_suspend_clear_flags();
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error = platform_begin(platform_mode);
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if (error)
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goto Close;
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/* Preallocate image memory before shutting down devices. */
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error = hibernate_preallocate_memory();
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if (error)
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goto Close;
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error = freeze_kernel_threads();
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if (error)
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goto Cleanup;
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if (hibernation_test(TEST_FREEZER)) {
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/*
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* Indicate to the caller that we are returning due to a
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* successful freezer test.
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*/
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freezer_test_done = true;
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goto Thaw;
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}
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error = dpm_prepare(PMSG_FREEZE);
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if (error) {
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dpm_complete(PMSG_RECOVER);
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goto Thaw;
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}
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suspend_console();
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pm_restrict_gfp_mask();
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error = dpm_suspend(PMSG_FREEZE);
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if (error || hibernation_test(TEST_DEVICES))
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platform_recover(platform_mode);
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else
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error = create_image(platform_mode);
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/*
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* In the case that we call create_image() above, the control
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* returns here (1) after the image has been created or the
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* image creation has failed and (2) after a successful restore.
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*/
|
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/* We may need to release the preallocated image pages here. */
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if (error || !in_suspend)
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swsusp_free();
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msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
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dpm_resume(msg);
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if (error || !in_suspend)
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pm_restore_gfp_mask();
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resume_console();
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dpm_complete(msg);
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Close:
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platform_end(platform_mode);
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return error;
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Thaw:
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thaw_kernel_threads();
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Cleanup:
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swsusp_free();
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goto Close;
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}
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int __weak hibernate_resume_nonboot_cpu_disable(void)
|
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{
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|
return suspend_disable_secondary_cpus();
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}
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|
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/**
|
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* resume_target_kernel - Restore system state from a hibernation image.
|
|
* @platform_mode: Whether or not to use the platform driver.
|
|
*
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* Execute device drivers' "noirq" and "late" freeze callbacks, restore the
|
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* contents of highmem that have not been restored yet from the image and run
|
|
* the low-level code that will restore the remaining contents of memory and
|
|
* switch to the just restored target kernel.
|
|
*/
|
|
static int resume_target_kernel(bool platform_mode)
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{
|
|
int error;
|
|
|
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error = dpm_suspend_end(PMSG_QUIESCE);
|
|
if (error) {
|
|
pr_err("Some devices failed to power down, aborting resume\n");
|
|
return error;
|
|
}
|
|
|
|
error = platform_pre_restore(platform_mode);
|
|
if (error)
|
|
goto Cleanup;
|
|
|
|
error = hibernate_resume_nonboot_cpu_disable();
|
|
if (error)
|
|
goto Enable_cpus;
|
|
|
|
local_irq_disable();
|
|
system_state = SYSTEM_SUSPEND;
|
|
|
|
error = syscore_suspend();
|
|
if (error)
|
|
goto Enable_irqs;
|
|
|
|
save_processor_state();
|
|
error = restore_highmem();
|
|
if (!error) {
|
|
error = swsusp_arch_resume();
|
|
/*
|
|
* The code below is only ever reached in case of a failure.
|
|
* Otherwise, execution continues at the place where
|
|
* swsusp_arch_suspend() was called.
|
|
*/
|
|
BUG_ON(!error);
|
|
/*
|
|
* This call to restore_highmem() reverts the changes made by
|
|
* the previous one.
|
|
*/
|
|
restore_highmem();
|
|
}
|
|
/*
|
|
* The only reason why swsusp_arch_resume() can fail is memory being
|
|
* very tight, so we have to free it as soon as we can to avoid
|
|
* subsequent failures.
|
|
*/
|
|
swsusp_free();
|
|
restore_processor_state();
|
|
touch_softlockup_watchdog();
|
|
|
|
syscore_resume();
|
|
|
|
Enable_irqs:
|
|
system_state = SYSTEM_RUNNING;
|
|
local_irq_enable();
|
|
|
|
Enable_cpus:
|
|
suspend_enable_secondary_cpus();
|
|
|
|
Cleanup:
|
|
platform_restore_cleanup(platform_mode);
|
|
|
|
dpm_resume_start(PMSG_RECOVER);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* hibernation_restore - Quiesce devices and restore from a hibernation image.
|
|
* @platform_mode: If set, use platform driver to prepare for the transition.
|
|
*
|
|
* This routine must be called with system_transition_mutex held. If it is
|
|
* successful, control reappears in the restored target kernel in
|
|
* hibernation_snapshot().
|
|
*/
|
|
int hibernation_restore(int platform_mode)
|
|
{
|
|
int error;
|
|
|
|
pm_prepare_console();
|
|
suspend_console();
|
|
pm_restrict_gfp_mask();
|
|
error = dpm_suspend_start(PMSG_QUIESCE);
|
|
if (!error) {
|
|
error = resume_target_kernel(platform_mode);
|
|
/*
|
|
* The above should either succeed and jump to the new kernel,
|
|
* or return with an error. Otherwise things are just
|
|
* undefined, so let's be paranoid.
|
|
*/
|
|
BUG_ON(!error);
|
|
}
|
|
dpm_resume_end(PMSG_RECOVER);
|
|
pm_restore_gfp_mask();
|
|
resume_console();
|
|
pm_restore_console();
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* hibernation_platform_enter - Power off the system using the platform driver.
|
|
*/
|
|
int hibernation_platform_enter(void)
|
|
{
|
|
int error;
|
|
|
|
if (!hibernation_ops)
|
|
return -ENOSYS;
|
|
|
|
/*
|
|
* We have cancelled the power transition by running
|
|
* hibernation_ops->finish() before saving the image, so we should let
|
|
* the firmware know that we're going to enter the sleep state after all
|
|
*/
|
|
error = hibernation_ops->begin(PMSG_HIBERNATE);
|
|
if (error)
|
|
goto Close;
|
|
|
|
entering_platform_hibernation = true;
|
|
suspend_console();
|
|
error = dpm_suspend_start(PMSG_HIBERNATE);
|
|
if (error) {
|
|
if (hibernation_ops->recover)
|
|
hibernation_ops->recover();
|
|
goto Resume_devices;
|
|
}
|
|
|
|
error = dpm_suspend_end(PMSG_HIBERNATE);
|
|
if (error)
|
|
goto Resume_devices;
|
|
|
|
error = hibernation_ops->prepare();
|
|
if (error)
|
|
goto Platform_finish;
|
|
|
|
error = suspend_disable_secondary_cpus();
|
|
if (error)
|
|
goto Enable_cpus;
|
|
|
|
local_irq_disable();
|
|
system_state = SYSTEM_SUSPEND;
|
|
syscore_suspend();
|
|
if (pm_wakeup_pending()) {
|
|
error = -EAGAIN;
|
|
goto Power_up;
|
|
}
|
|
|
|
hibernation_ops->enter();
|
|
/* We should never get here */
|
|
while (1);
|
|
|
|
Power_up:
|
|
syscore_resume();
|
|
system_state = SYSTEM_RUNNING;
|
|
local_irq_enable();
|
|
|
|
Enable_cpus:
|
|
suspend_enable_secondary_cpus();
|
|
|
|
Platform_finish:
|
|
hibernation_ops->finish();
|
|
|
|
dpm_resume_start(PMSG_RESTORE);
|
|
|
|
Resume_devices:
|
|
entering_platform_hibernation = false;
|
|
dpm_resume_end(PMSG_RESTORE);
|
|
resume_console();
|
|
|
|
Close:
|
|
hibernation_ops->end();
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* power_down - Shut the machine down for hibernation.
|
|
*
|
|
* Use the platform driver, if configured, to put the system into the sleep
|
|
* state corresponding to hibernation, or try to power it off or reboot,
|
|
* depending on the value of hibernation_mode.
|
|
*/
|
|
static void power_down(void)
|
|
{
|
|
#ifdef CONFIG_SUSPEND
|
|
int error;
|
|
|
|
if (hibernation_mode == HIBERNATION_SUSPEND) {
|
|
error = suspend_devices_and_enter(PM_SUSPEND_MEM);
|
|
if (error) {
|
|
hibernation_mode = hibernation_ops ?
|
|
HIBERNATION_PLATFORM :
|
|
HIBERNATION_SHUTDOWN;
|
|
} else {
|
|
/* Restore swap signature. */
|
|
error = swsusp_unmark();
|
|
if (error)
|
|
pr_err("Swap will be unusable! Try swapon -a.\n");
|
|
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
switch (hibernation_mode) {
|
|
case HIBERNATION_REBOOT:
|
|
kernel_restart(NULL);
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
hibernation_platform_enter();
|
|
/* Fall through */
|
|
case HIBERNATION_SHUTDOWN:
|
|
if (pm_power_off)
|
|
kernel_power_off();
|
|
break;
|
|
}
|
|
kernel_halt();
|
|
/*
|
|
* Valid image is on the disk, if we continue we risk serious data
|
|
* corruption after resume.
|
|
*/
|
|
pr_crit("Power down manually\n");
|
|
while (1)
|
|
cpu_relax();
|
|
}
|
|
|
|
static int load_image_and_restore(void)
|
|
{
|
|
int error;
|
|
unsigned int flags;
|
|
|
|
pm_pr_dbg("Loading hibernation image.\n");
|
|
|
|
lock_device_hotplug();
|
|
error = create_basic_memory_bitmaps();
|
|
if (error)
|
|
goto Unlock;
|
|
|
|
error = swsusp_read(&flags);
|
|
swsusp_close(FMODE_READ);
|
|
if (!error)
|
|
hibernation_restore(flags & SF_PLATFORM_MODE);
|
|
|
|
pr_err("Failed to load hibernation image, recovering.\n");
|
|
swsusp_free();
|
|
free_basic_memory_bitmaps();
|
|
Unlock:
|
|
unlock_device_hotplug();
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* hibernate - Carry out system hibernation, including saving the image.
|
|
*/
|
|
int hibernate(void)
|
|
{
|
|
int error, nr_calls = 0;
|
|
bool snapshot_test = false;
|
|
|
|
if (!hibernation_available()) {
|
|
pm_pr_dbg("Hibernation not available.\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
lock_system_sleep();
|
|
/* The snapshot device should not be opened while we're running */
|
|
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
|
|
error = -EBUSY;
|
|
goto Unlock;
|
|
}
|
|
|
|
pr_info("hibernation entry\n");
|
|
pm_prepare_console();
|
|
error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
|
|
if (error) {
|
|
nr_calls--;
|
|
goto Exit;
|
|
}
|
|
|
|
ksys_sync_helper();
|
|
|
|
error = freeze_processes();
|
|
if (error)
|
|
goto Exit;
|
|
|
|
lock_device_hotplug();
|
|
/* Allocate memory management structures */
|
|
error = create_basic_memory_bitmaps();
|
|
if (error)
|
|
goto Thaw;
|
|
|
|
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
|
|
if (error || freezer_test_done)
|
|
goto Free_bitmaps;
|
|
|
|
if (in_suspend) {
|
|
unsigned int flags = 0;
|
|
|
|
if (hibernation_mode == HIBERNATION_PLATFORM)
|
|
flags |= SF_PLATFORM_MODE;
|
|
if (nocompress)
|
|
flags |= SF_NOCOMPRESS_MODE;
|
|
else
|
|
flags |= SF_CRC32_MODE;
|
|
|
|
pm_pr_dbg("Writing image.\n");
|
|
error = swsusp_write(flags);
|
|
swsusp_free();
|
|
if (!error) {
|
|
if (hibernation_mode == HIBERNATION_TEST_RESUME)
|
|
snapshot_test = true;
|
|
else
|
|
power_down();
|
|
}
|
|
in_suspend = 0;
|
|
pm_restore_gfp_mask();
|
|
} else {
|
|
pm_pr_dbg("Image restored successfully.\n");
|
|
}
|
|
|
|
Free_bitmaps:
|
|
free_basic_memory_bitmaps();
|
|
Thaw:
|
|
unlock_device_hotplug();
|
|
if (snapshot_test) {
|
|
pm_pr_dbg("Checking hibernation image\n");
|
|
error = swsusp_check();
|
|
if (!error)
|
|
error = load_image_and_restore();
|
|
}
|
|
thaw_processes();
|
|
|
|
/* Don't bother checking whether freezer_test_done is true */
|
|
freezer_test_done = false;
|
|
Exit:
|
|
__pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
|
|
pm_restore_console();
|
|
atomic_inc(&snapshot_device_available);
|
|
Unlock:
|
|
unlock_system_sleep();
|
|
pr_info("hibernation exit\n");
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/**
|
|
* software_resume - Resume from a saved hibernation image.
|
|
*
|
|
* This routine is called as a late initcall, when all devices have been
|
|
* discovered and initialized already.
|
|
*
|
|
* The image reading code is called to see if there is a hibernation image
|
|
* available for reading. If that is the case, devices are quiesced and the
|
|
* contents of memory is restored from the saved image.
|
|
*
|
|
* If this is successful, control reappears in the restored target kernel in
|
|
* hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
|
|
* attempts to recover gracefully and make the kernel return to the normal mode
|
|
* of operation.
|
|
*/
|
|
static int software_resume(void)
|
|
{
|
|
int error, nr_calls = 0;
|
|
|
|
/*
|
|
* If the user said "noresume".. bail out early.
|
|
*/
|
|
if (noresume || !hibernation_available())
|
|
return 0;
|
|
|
|
/*
|
|
* name_to_dev_t() below takes a sysfs buffer mutex when sysfs
|
|
* is configured into the kernel. Since the regular hibernate
|
|
* trigger path is via sysfs which takes a buffer mutex before
|
|
* calling hibernate functions (which take system_transition_mutex)
|
|
* this can cause lockdep to complain about a possible ABBA deadlock
|
|
* which cannot happen since we're in the boot code here and
|
|
* sysfs can't be invoked yet. Therefore, we use a subclass
|
|
* here to avoid lockdep complaining.
|
|
*/
|
|
mutex_lock_nested(&system_transition_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
if (swsusp_resume_device)
|
|
goto Check_image;
|
|
|
|
if (!strlen(resume_file)) {
|
|
error = -ENOENT;
|
|
goto Unlock;
|
|
}
|
|
|
|
pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
|
|
|
|
if (resume_delay) {
|
|
pr_info("Waiting %dsec before reading resume device ...\n",
|
|
resume_delay);
|
|
ssleep(resume_delay);
|
|
}
|
|
|
|
/* Check if the device is there */
|
|
swsusp_resume_device = name_to_dev_t(resume_file);
|
|
|
|
/*
|
|
* name_to_dev_t is ineffective to verify parition if resume_file is in
|
|
* integer format. (e.g. major:minor)
|
|
*/
|
|
if (isdigit(resume_file[0]) && resume_wait) {
|
|
int partno;
|
|
while (!get_gendisk(swsusp_resume_device, &partno))
|
|
msleep(10);
|
|
}
|
|
|
|
if (!swsusp_resume_device) {
|
|
/*
|
|
* Some device discovery might still be in progress; we need
|
|
* to wait for this to finish.
|
|
*/
|
|
wait_for_device_probe();
|
|
|
|
if (resume_wait) {
|
|
while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
|
|
msleep(10);
|
|
async_synchronize_full();
|
|
}
|
|
|
|
swsusp_resume_device = name_to_dev_t(resume_file);
|
|
if (!swsusp_resume_device) {
|
|
error = -ENODEV;
|
|
goto Unlock;
|
|
}
|
|
}
|
|
|
|
Check_image:
|
|
pm_pr_dbg("Hibernation image partition %d:%d present\n",
|
|
MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
|
|
|
|
pm_pr_dbg("Looking for hibernation image.\n");
|
|
error = swsusp_check();
|
|
if (error)
|
|
goto Unlock;
|
|
|
|
/* The snapshot device should not be opened while we're running */
|
|
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
|
|
error = -EBUSY;
|
|
swsusp_close(FMODE_READ);
|
|
goto Unlock;
|
|
}
|
|
|
|
pr_info("resume from hibernation\n");
|
|
pm_prepare_console();
|
|
error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
|
|
if (error) {
|
|
nr_calls--;
|
|
goto Close_Finish;
|
|
}
|
|
|
|
pm_pr_dbg("Preparing processes for restore.\n");
|
|
error = freeze_processes();
|
|
if (error)
|
|
goto Close_Finish;
|
|
error = load_image_and_restore();
|
|
thaw_processes();
|
|
Finish:
|
|
__pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
|
|
pm_restore_console();
|
|
pr_info("resume from hibernation failed (%d)\n", error);
|
|
atomic_inc(&snapshot_device_available);
|
|
/* For success case, the suspend path will release the lock */
|
|
Unlock:
|
|
mutex_unlock(&system_transition_mutex);
|
|
pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
|
|
return error;
|
|
Close_Finish:
|
|
swsusp_close(FMODE_READ);
|
|
goto Finish;
|
|
}
|
|
|
|
late_initcall_sync(software_resume);
|
|
|
|
|
|
static const char * const hibernation_modes[] = {
|
|
[HIBERNATION_PLATFORM] = "platform",
|
|
[HIBERNATION_SHUTDOWN] = "shutdown",
|
|
[HIBERNATION_REBOOT] = "reboot",
|
|
#ifdef CONFIG_SUSPEND
|
|
[HIBERNATION_SUSPEND] = "suspend",
|
|
#endif
|
|
[HIBERNATION_TEST_RESUME] = "test_resume",
|
|
};
|
|
|
|
/*
|
|
* /sys/power/disk - Control hibernation mode.
|
|
*
|
|
* Hibernation can be handled in several ways. There are a few different ways
|
|
* to put the system into the sleep state: using the platform driver (e.g. ACPI
|
|
* or other hibernation_ops), powering it off or rebooting it (for testing
|
|
* mostly).
|
|
*
|
|
* The sysfs file /sys/power/disk provides an interface for selecting the
|
|
* hibernation mode to use. Reading from this file causes the available modes
|
|
* to be printed. There are 3 modes that can be supported:
|
|
*
|
|
* 'platform'
|
|
* 'shutdown'
|
|
* 'reboot'
|
|
*
|
|
* If a platform hibernation driver is in use, 'platform' will be supported
|
|
* and will be used by default. Otherwise, 'shutdown' will be used by default.
|
|
* The selected option (i.e. the one corresponding to the current value of
|
|
* hibernation_mode) is enclosed by a square bracket.
|
|
*
|
|
* To select a given hibernation mode it is necessary to write the mode's
|
|
* string representation (as returned by reading from /sys/power/disk) back
|
|
* into /sys/power/disk.
|
|
*/
|
|
|
|
static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int i;
|
|
char *start = buf;
|
|
|
|
if (!hibernation_available())
|
|
return sprintf(buf, "[disabled]\n");
|
|
|
|
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
|
|
if (!hibernation_modes[i])
|
|
continue;
|
|
switch (i) {
|
|
case HIBERNATION_SHUTDOWN:
|
|
case HIBERNATION_REBOOT:
|
|
#ifdef CONFIG_SUSPEND
|
|
case HIBERNATION_SUSPEND:
|
|
#endif
|
|
case HIBERNATION_TEST_RESUME:
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
if (hibernation_ops)
|
|
break;
|
|
/* not a valid mode, continue with loop */
|
|
continue;
|
|
}
|
|
if (i == hibernation_mode)
|
|
buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
|
|
else
|
|
buf += sprintf(buf, "%s ", hibernation_modes[i]);
|
|
}
|
|
buf += sprintf(buf, "\n");
|
|
return buf-start;
|
|
}
|
|
|
|
static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
int error = 0;
|
|
int i;
|
|
int len;
|
|
char *p;
|
|
int mode = HIBERNATION_INVALID;
|
|
|
|
if (!hibernation_available())
|
|
return -EPERM;
|
|
|
|
p = memchr(buf, '\n', n);
|
|
len = p ? p - buf : n;
|
|
|
|
lock_system_sleep();
|
|
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
|
|
if (len == strlen(hibernation_modes[i])
|
|
&& !strncmp(buf, hibernation_modes[i], len)) {
|
|
mode = i;
|
|
break;
|
|
}
|
|
}
|
|
if (mode != HIBERNATION_INVALID) {
|
|
switch (mode) {
|
|
case HIBERNATION_SHUTDOWN:
|
|
case HIBERNATION_REBOOT:
|
|
#ifdef CONFIG_SUSPEND
|
|
case HIBERNATION_SUSPEND:
|
|
#endif
|
|
case HIBERNATION_TEST_RESUME:
|
|
hibernation_mode = mode;
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
if (hibernation_ops)
|
|
hibernation_mode = mode;
|
|
else
|
|
error = -EINVAL;
|
|
}
|
|
} else
|
|
error = -EINVAL;
|
|
|
|
if (!error)
|
|
pm_pr_dbg("Hibernation mode set to '%s'\n",
|
|
hibernation_modes[mode]);
|
|
unlock_system_sleep();
|
|
return error ? error : n;
|
|
}
|
|
|
|
power_attr(disk);
|
|
|
|
static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
|
|
MINOR(swsusp_resume_device));
|
|
}
|
|
|
|
static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
dev_t res;
|
|
int len = n;
|
|
char *name;
|
|
|
|
if (len && buf[len-1] == '\n')
|
|
len--;
|
|
name = kstrndup(buf, len, GFP_KERNEL);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
res = name_to_dev_t(name);
|
|
kfree(name);
|
|
if (!res)
|
|
return -EINVAL;
|
|
|
|
lock_system_sleep();
|
|
swsusp_resume_device = res;
|
|
unlock_system_sleep();
|
|
pm_pr_dbg("Configured resume from disk to %u\n", swsusp_resume_device);
|
|
noresume = 0;
|
|
software_resume();
|
|
return n;
|
|
}
|
|
|
|
power_attr(resume);
|
|
|
|
static ssize_t resume_offset_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
|
|
}
|
|
|
|
static ssize_t resume_offset_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr, const char *buf,
|
|
size_t n)
|
|
{
|
|
unsigned long long offset;
|
|
int rc;
|
|
|
|
rc = kstrtoull(buf, 0, &offset);
|
|
if (rc)
|
|
return rc;
|
|
swsusp_resume_block = offset;
|
|
|
|
return n;
|
|
}
|
|
|
|
power_attr(resume_offset);
|
|
|
|
static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%lu\n", image_size);
|
|
}
|
|
|
|
static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned long size;
|
|
|
|
if (sscanf(buf, "%lu", &size) == 1) {
|
|
image_size = size;
|
|
return n;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
power_attr(image_size);
|
|
|
|
static ssize_t reserved_size_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%lu\n", reserved_size);
|
|
}
|
|
|
|
static ssize_t reserved_size_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned long size;
|
|
|
|
if (sscanf(buf, "%lu", &size) == 1) {
|
|
reserved_size = size;
|
|
return n;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
power_attr(reserved_size);
|
|
|
|
static struct attribute * g[] = {
|
|
&disk_attr.attr,
|
|
&resume_offset_attr.attr,
|
|
&resume_attr.attr,
|
|
&image_size_attr.attr,
|
|
&reserved_size_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
|
|
static const struct attribute_group attr_group = {
|
|
.attrs = g,
|
|
};
|
|
|
|
|
|
static int __init pm_disk_init(void)
|
|
{
|
|
return sysfs_create_group(power_kobj, &attr_group);
|
|
}
|
|
|
|
core_initcall(pm_disk_init);
|
|
|
|
|
|
static int __init resume_setup(char *str)
|
|
{
|
|
if (noresume)
|
|
return 1;
|
|
|
|
strncpy( resume_file, str, 255 );
|
|
return 1;
|
|
}
|
|
|
|
static int __init resume_offset_setup(char *str)
|
|
{
|
|
unsigned long long offset;
|
|
|
|
if (noresume)
|
|
return 1;
|
|
|
|
if (sscanf(str, "%llu", &offset) == 1)
|
|
swsusp_resume_block = offset;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int __init hibernate_setup(char *str)
|
|
{
|
|
if (!strncmp(str, "noresume", 8)) {
|
|
noresume = 1;
|
|
} else if (!strncmp(str, "nocompress", 10)) {
|
|
nocompress = 1;
|
|
} else if (!strncmp(str, "no", 2)) {
|
|
noresume = 1;
|
|
nohibernate = 1;
|
|
} else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
|
|
&& !strncmp(str, "protect_image", 13)) {
|
|
enable_restore_image_protection();
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int __init noresume_setup(char *str)
|
|
{
|
|
noresume = 1;
|
|
return 1;
|
|
}
|
|
|
|
static int __init resumewait_setup(char *str)
|
|
{
|
|
resume_wait = 1;
|
|
return 1;
|
|
}
|
|
|
|
static int __init resumedelay_setup(char *str)
|
|
{
|
|
int rc = kstrtouint(str, 0, &resume_delay);
|
|
|
|
if (rc)
|
|
return rc;
|
|
return 1;
|
|
}
|
|
|
|
static int __init nohibernate_setup(char *str)
|
|
{
|
|
noresume = 1;
|
|
nohibernate = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("noresume", noresume_setup);
|
|
__setup("resume_offset=", resume_offset_setup);
|
|
__setup("resume=", resume_setup);
|
|
__setup("hibernate=", hibernate_setup);
|
|
__setup("resumewait", resumewait_setup);
|
|
__setup("resumedelay=", resumedelay_setup);
|
|
__setup("nohibernate", nohibernate_setup);
|