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* ACPI conversion to PM handling based on struct dev_pm_ops. * Conversion of a number of platform drivers to PM handling based on struct dev_pm_ops and removal of empty legacy PM callbacks from a couple of PCI drivers. * Suspend-to-both for in-kernel hibernation from Bojan Smojver. * cpuidle fixes and cleanups from ShuoX Liu, Daniel Lezcano and Preeti U Murthy. * cpufreq bug fixes from Jonghwa Lee and Stephen Boyd. * Suspend and hibernate fixes from Srivatsa S. Bhat and Colin Cross. * Generic PM domains framework updates. * RTC CMOS wakeup signaling update from Paul Fox. * sparse warnings fixes from Sachin Kamat. * Build warnings fixes for the generic PM domains framework and PM sysfs code. * sysfs switch for printing device suspend times from Sameer Nanda. * Documentation fix from Oskar Schirmer. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIcBAABAgAGBQJQDF5eAAoJEKhOf7ml8uNsEaAP/2wg4faoOGob5A0/7tLqG3Cw xnTmGsfL7wG07Q8ykCL1BSlBb1VeJz8L6LTmUpaABI4M//oIBlcYQKyCE0Tat1AO 9bJXFzK7qcHMhkTz6d6LDqtVzR3NGM3ypjZqj8aEXBov07LMR1AXvgNwXXhv25zM 0unwrh1XNinBN3n+oaktpWk1YHUjsa5IMU+2tQJrocuHXcgK30vGXZVrZ4g9w1c2 eS+ED1oKUqOYtFzIUX+aCtaDDheGaPlugk/GOtIB7Sae0s0vMlxH/T5ncB4SxRC+ v3s4OykqQc5Dc8+0bNlBH7ykSVNB0PoQiyKDY67CxtH+q1xQSc9/f3XJqnGMaVDE 17eZUZsL4qSyzRuCbPCGAgwBHmx3qNCMu1i1BcmnSxU+ikPUeCR7mYOP0mRThwPH OSfs+c/vZ+Ow6CwVE4UFrbm9Jve7ADnCrlZzT2m6XjhHGyjKP7SJlzP9TPsZ0LRk oxgQDYHmxbo50t9tBCz5L4ZTMKkDp28e78x84/CteP85srcW3GqDxrPyp2uzJu5O tvIEBvVlc4ucq8sG83RkugQwrG/2cQwG2HO9ERAwq01HHA1BYsuU3A961Jqf5CZo nFRSnByvVj/imPf47OWpDPAbVEs7jxufJuLEbPwGj1MkttTGDBIRu3zldXt2S6kP Q4qYU6fDaQQHFc90pqxQ =vC4/ -----END PGP SIGNATURE----- Merge tag 'pm-for-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management updates from Rafael Wysocki: - ACPI conversion to PM handling based on struct dev_pm_ops. - Conversion of a number of platform drivers to PM handling based on struct dev_pm_ops and removal of empty legacy PM callbacks from a couple of PCI drivers. - Suspend-to-both for in-kernel hibernation from Bojan Smojver. - cpuidle fixes and cleanups from ShuoX Liu, Daniel Lezcano and Preeti Murthy. - cpufreq bug fixes from Jonghwa Lee and Stephen Boyd. - Suspend and hibernate fixes from Srivatsa Bhat and Colin Cross. - Generic PM domains framework updates. - RTC CMOS wakeup signaling update from Paul Fox. - sparse warnings fixes from Sachin Kamat. - Build warnings fixes for the generic PM domains framework and PM sysfs code. - sysfs switch for printing device suspend times from Sameer Nanda. - Documentation fix from Oskar Schirmer. * tag 'pm-for-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (70 commits) cpufreq: Fix sysfs deadlock with concurrent hotplug/frequency switch EXYNOS: bugfix on retrieving old_index from freqs.old PM / Sleep: call early resume handlers when suspend_noirq fails PM / QoS: Use NULL pointer instead of plain integer in qos.c PM / QoS: Use NULL pointer instead of plain integer in pm_qos.h PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake_unlock PM / Sleep: Add missing static storage class specifiers in main.c cpuilde / ACPI: remove time from acpi_processor_cx structure cpuidle / ACPI: remove usage from acpi_processor_cx structure cpuidle / ACPI : remove latency_ticks from acpi_processor_cx structure rtc-cmos: report wakeups from interrupt handler PM / Sleep: Fix build warning in sysfs.c for CONFIG_PM_SLEEP unset PM / Domains: Fix build warning for CONFIG_PM_RUNTIME unset olpc-xo15-sci: Use struct dev_pm_ops for power management PM / Domains: Replace plain integer with NULL pointer in domain.c file PM / Domains: Add missing static storage class specifier in domain.c file PM / crypto / ux500: Use struct dev_pm_ops for power management PM / IPMI: Remove empty legacy PCI PM callbacks tpm_nsc: Use struct dev_pm_ops for power management tpm_tis: Use struct dev_pm_ops for power management ...
1117 lines
26 KiB
C
1117 lines
26 KiB
C
/*
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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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* This file is released under the GPLv2.
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*/
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#include <linux/export.h>
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#include <linux/suspend.h>
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#include <linux/syscalls.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/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 "power.h"
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static int nocompress;
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static int noresume;
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static int resume_wait;
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static 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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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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/* 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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/**
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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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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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printk(KERN_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() : 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(struct timeval *start, struct timeval *stop,
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unsigned nr_pages, char *msg)
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{
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s64 elapsed_centisecs64;
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int centisecs;
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int k;
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int kps;
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elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
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do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
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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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printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
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msg, k,
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centisecs / 100, centisecs % 100,
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kps / 1000, (kps % 1000) / 10);
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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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printk(KERN_ERR "PM: Some devices failed to power down, "
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"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 = disable_nonboot_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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error = syscore_suspend();
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if (error) {
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printk(KERN_ERR "PM: Some system devices failed to power down, "
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"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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error = swsusp_arch_suspend();
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if (error)
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printk(KERN_ERR "PM: Error %d creating hibernation image\n",
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error);
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/* Restore control flow magically appears here */
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restore_processor_state();
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if (!in_suspend) {
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events_check_enabled = false;
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platform_leave(platform_mode);
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}
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Power_up:
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syscore_resume();
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Enable_irqs:
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local_irq_enable();
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Enable_cpus:
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enable_nonboot_cpus();
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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 pm_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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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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ftrace_stop();
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pm_restrict_gfp_mask();
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|
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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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/*
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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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|
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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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|
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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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|
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if (error || !in_suspend)
|
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pm_restore_gfp_mask();
|
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|
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ftrace_start();
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resume_console();
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dpm_complete(msg);
|
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|
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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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* resume_target_kernel - Restore system state from a hibernation image.
|
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* @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.
|
|
*/
|
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static int resume_target_kernel(bool platform_mode)
|
|
{
|
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int error;
|
|
|
|
error = dpm_suspend_end(PMSG_QUIESCE);
|
|
if (error) {
|
|
printk(KERN_ERR "PM: Some devices failed to power down, "
|
|
"aborting resume\n");
|
|
return error;
|
|
}
|
|
|
|
error = platform_pre_restore(platform_mode);
|
|
if (error)
|
|
goto Cleanup;
|
|
|
|
error = disable_nonboot_cpus();
|
|
if (error)
|
|
goto Enable_cpus;
|
|
|
|
local_irq_disable();
|
|
|
|
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:
|
|
local_irq_enable();
|
|
|
|
Enable_cpus:
|
|
enable_nonboot_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 pm_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();
|
|
ftrace_stop();
|
|
pm_restrict_gfp_mask();
|
|
error = dpm_suspend_start(PMSG_QUIESCE);
|
|
if (!error) {
|
|
error = resume_target_kernel(platform_mode);
|
|
dpm_resume_end(PMSG_RECOVER);
|
|
}
|
|
pm_restore_gfp_mask();
|
|
ftrace_start();
|
|
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();
|
|
if (error)
|
|
goto Close;
|
|
|
|
entering_platform_hibernation = true;
|
|
suspend_console();
|
|
ftrace_stop();
|
|
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 = disable_nonboot_cpus();
|
|
if (error)
|
|
goto Platform_finish;
|
|
|
|
local_irq_disable();
|
|
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();
|
|
local_irq_enable();
|
|
enable_nonboot_cpus();
|
|
|
|
Platform_finish:
|
|
hibernation_ops->finish();
|
|
|
|
dpm_resume_start(PMSG_RESTORE);
|
|
|
|
Resume_devices:
|
|
entering_platform_hibernation = false;
|
|
dpm_resume_end(PMSG_RESTORE);
|
|
ftrace_start();
|
|
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;
|
|
#endif
|
|
|
|
switch (hibernation_mode) {
|
|
case HIBERNATION_REBOOT:
|
|
kernel_restart(NULL);
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
hibernation_platform_enter();
|
|
case HIBERNATION_SHUTDOWN:
|
|
kernel_power_off();
|
|
break;
|
|
#ifdef CONFIG_SUSPEND
|
|
case HIBERNATION_SUSPEND:
|
|
error = suspend_devices_and_enter(PM_SUSPEND_MEM);
|
|
if (error) {
|
|
if (hibernation_ops)
|
|
hibernation_mode = HIBERNATION_PLATFORM;
|
|
else
|
|
hibernation_mode = HIBERNATION_SHUTDOWN;
|
|
power_down();
|
|
}
|
|
/*
|
|
* Restore swap signature.
|
|
*/
|
|
error = swsusp_unmark();
|
|
if (error)
|
|
printk(KERN_ERR "PM: Swap will be unusable! "
|
|
"Try swapon -a.\n");
|
|
return;
|
|
#endif
|
|
}
|
|
kernel_halt();
|
|
/*
|
|
* Valid image is on the disk, if we continue we risk serious data
|
|
* corruption after resume.
|
|
*/
|
|
printk(KERN_CRIT "PM: Please power down manually\n");
|
|
while(1);
|
|
}
|
|
|
|
/**
|
|
* hibernate - Carry out system hibernation, including saving the image.
|
|
*/
|
|
int hibernate(void)
|
|
{
|
|
int error;
|
|
|
|
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;
|
|
}
|
|
|
|
pm_prepare_console();
|
|
error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
|
|
if (error)
|
|
goto Exit;
|
|
|
|
/* Allocate memory management structures */
|
|
error = create_basic_memory_bitmaps();
|
|
if (error)
|
|
goto Exit;
|
|
|
|
printk(KERN_INFO "PM: Syncing filesystems ... ");
|
|
sys_sync();
|
|
printk("done.\n");
|
|
|
|
error = freeze_processes();
|
|
if (error)
|
|
goto Free_bitmaps;
|
|
|
|
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
|
|
if (error || freezer_test_done)
|
|
goto Thaw;
|
|
|
|
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;
|
|
|
|
pr_debug("PM: writing image.\n");
|
|
error = swsusp_write(flags);
|
|
swsusp_free();
|
|
if (!error)
|
|
power_down();
|
|
in_suspend = 0;
|
|
pm_restore_gfp_mask();
|
|
} else {
|
|
pr_debug("PM: Image restored successfully.\n");
|
|
}
|
|
|
|
Thaw:
|
|
thaw_processes();
|
|
|
|
/* Don't bother checking whether freezer_test_done is true */
|
|
freezer_test_done = false;
|
|
|
|
Free_bitmaps:
|
|
free_basic_memory_bitmaps();
|
|
Exit:
|
|
pm_notifier_call_chain(PM_POST_HIBERNATION);
|
|
pm_restore_console();
|
|
atomic_inc(&snapshot_device_available);
|
|
Unlock:
|
|
unlock_system_sleep();
|
|
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_snaphot() 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;
|
|
unsigned int flags;
|
|
|
|
/*
|
|
* If the user said "noresume".. bail out early.
|
|
*/
|
|
if (noresume)
|
|
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 pm_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(&pm_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
if (swsusp_resume_device)
|
|
goto Check_image;
|
|
|
|
if (!strlen(resume_file)) {
|
|
error = -ENOENT;
|
|
goto Unlock;
|
|
}
|
|
|
|
pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
|
|
|
|
if (resume_delay) {
|
|
printk(KERN_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:
|
|
pr_debug("PM: Hibernation image partition %d:%d present\n",
|
|
MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
|
|
|
|
pr_debug("PM: 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;
|
|
}
|
|
|
|
pm_prepare_console();
|
|
error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
|
|
if (error)
|
|
goto close_finish;
|
|
|
|
error = create_basic_memory_bitmaps();
|
|
if (error)
|
|
goto close_finish;
|
|
|
|
pr_debug("PM: Preparing processes for restore.\n");
|
|
error = freeze_processes();
|
|
if (error) {
|
|
swsusp_close(FMODE_READ);
|
|
goto Done;
|
|
}
|
|
|
|
pr_debug("PM: Loading hibernation image.\n");
|
|
|
|
error = swsusp_read(&flags);
|
|
swsusp_close(FMODE_READ);
|
|
if (!error)
|
|
hibernation_restore(flags & SF_PLATFORM_MODE);
|
|
|
|
printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
|
|
swsusp_free();
|
|
thaw_processes();
|
|
Done:
|
|
free_basic_memory_bitmaps();
|
|
Finish:
|
|
pm_notifier_call_chain(PM_POST_RESTORE);
|
|
pm_restore_console();
|
|
atomic_inc(&snapshot_device_available);
|
|
/* For success case, the suspend path will release the lock */
|
|
Unlock:
|
|
mutex_unlock(&pm_mutex);
|
|
pr_debug("PM: Hibernation image not present or could not be loaded.\n");
|
|
return error;
|
|
close_finish:
|
|
swsusp_close(FMODE_READ);
|
|
goto Finish;
|
|
}
|
|
|
|
late_initcall(software_resume);
|
|
|
|
|
|
static const char * const hibernation_modes[] = {
|
|
[HIBERNATION_PLATFORM] = "platform",
|
|
[HIBERNATION_SHUTDOWN] = "shutdown",
|
|
[HIBERNATION_REBOOT] = "reboot",
|
|
#ifdef CONFIG_SUSPEND
|
|
[HIBERNATION_SUSPEND] = "suspend",
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* /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;
|
|
|
|
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
|
|
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;
|
|
|
|
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
|
|
hibernation_mode = mode;
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
if (hibernation_ops)
|
|
hibernation_mode = mode;
|
|
else
|
|
error = -EINVAL;
|
|
}
|
|
} else
|
|
error = -EINVAL;
|
|
|
|
if (!error)
|
|
pr_debug("PM: 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)
|
|
{
|
|
unsigned int maj, min;
|
|
dev_t res;
|
|
int ret = -EINVAL;
|
|
|
|
if (sscanf(buf, "%u:%u", &maj, &min) != 2)
|
|
goto out;
|
|
|
|
res = MKDEV(maj,min);
|
|
if (maj != MAJOR(res) || min != MINOR(res))
|
|
goto out;
|
|
|
|
lock_system_sleep();
|
|
swsusp_resume_device = res;
|
|
unlock_system_sleep();
|
|
printk(KERN_INFO "PM: Starting manual resume from disk\n");
|
|
noresume = 0;
|
|
software_resume();
|
|
ret = n;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
power_attr(resume);
|
|
|
|
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_attr.attr,
|
|
&image_size_attr.attr,
|
|
&reserved_size_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
|
|
static 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;
|
|
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)
|
|
{
|
|
resume_delay = simple_strtoul(str, NULL, 0);
|
|
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);
|