forked from luck/tmp_suning_uos_patched
386f275f5d
Switch all dynamically created ksets, that export simple attributes, to kobj_attribute from subsys_attribute. Struct subsys_attribute will be removed. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Cc: Mike Halcrow <mhalcrow@us.ibm.com> Cc: Phillip Hellewell <phillip@hellewell.homeip.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
754 lines
17 KiB
C
754 lines
17 KiB
C
/*
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* kernel/power/disk.c - 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@suse.cz>
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*
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* This file is released under the GPLv2.
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*
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*/
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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/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 "power.h"
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static int noresume = 0;
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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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enum {
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HIBERNATION_INVALID,
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HIBERNATION_PLATFORM,
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HIBERNATION_TEST,
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HIBERNATION_TESTPROC,
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HIBERNATION_SHUTDOWN,
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HIBERNATION_REBOOT,
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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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static 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: the hibernation operations to use in subsequent hibernation transitions
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*/
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void hibernation_set_ops(struct platform_hibernation_ops *ops)
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{
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if (ops && !(ops->start && ops->pre_snapshot && ops->finish
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&& ops->prepare && ops->enter && ops->pre_restore
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&& ops->restore_cleanup)) {
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WARN_ON(1);
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return;
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}
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mutex_lock(&pm_mutex);
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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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mutex_unlock(&pm_mutex);
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}
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/**
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* platform_start - tell the platform driver that we're starting
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* hibernation
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*/
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static int platform_start(int platform_mode)
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{
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return (platform_mode && hibernation_ops) ?
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hibernation_ops->start() : 0;
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}
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/**
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* platform_pre_snapshot - prepare the machine for hibernation using the
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* platform driver if so configured and return an error code if it 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 - prepare the machine for switching to the normal mode
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* of operation using the platform driver (called 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 - switch the machine to the normal mode of operation
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* using the platform driver (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 the platform for the restoration from a
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* hibernation image. If the restore fails after this function has been
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* called, 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 the platform to the normal mode of
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* operation after a failing restore. If platform_pre_restore() has been
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* called before the failing restore, this function must be called too,
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* regardless of the result of 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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* create_image - freeze devices that need to be frozen with interrupts
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* off, create the hibernation image and thaw those devices. Control
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* reappears in this routine after a restore.
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*/
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int create_image(int platform_mode)
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{
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int error;
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error = arch_prepare_suspend();
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if (error)
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return error;
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local_irq_disable();
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/* At this point, device_suspend() has been called, but *not*
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* device_power_down(). We *must* call device_power_down() now.
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* Otherwise, drivers for some devices (e.g. interrupt controllers)
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* become desynchronized with the actual state of the hardware
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* at resume time, and evil weirdness ensues.
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*/
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error = device_power_down(PMSG_FREEZE);
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if (error) {
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printk(KERN_ERR "Some devices failed to power down, "
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KERN_ERR "aborting suspend\n");
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goto Enable_irqs;
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}
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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 "Error %d while creating the image\n", 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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platform_leave(platform_mode);
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/* NOTE: device_power_up() is just a resume() for devices
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* that suspended with irqs off ... no overall powerup.
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*/
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device_power_up();
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Enable_irqs:
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local_irq_enable();
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return error;
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}
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/**
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* hibernation_snapshot - quiesce devices and create the hibernation
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* snapshot image.
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* @platform_mode - if set, use the platform driver, if available, to
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* prepare the platform frimware for the power transition.
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*
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* 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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int error;
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/* Free memory before shutting down devices. */
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error = swsusp_shrink_memory();
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if (error)
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return error;
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error = platform_start(platform_mode);
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if (error)
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return error;
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suspend_console();
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error = device_suspend(PMSG_FREEZE);
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if (error)
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goto Resume_console;
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error = platform_pre_snapshot(platform_mode);
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if (error)
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goto Resume_devices;
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error = disable_nonboot_cpus();
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if (!error) {
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if (hibernation_mode != HIBERNATION_TEST) {
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in_suspend = 1;
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error = create_image(platform_mode);
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/* Control returns here after successful restore */
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} else {
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printk("swsusp debug: Waiting for 5 seconds.\n");
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mdelay(5000);
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}
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}
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enable_nonboot_cpus();
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Resume_devices:
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platform_finish(platform_mode);
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device_resume();
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Resume_console:
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resume_console();
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return error;
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}
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/**
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* hibernation_restore - quiesce devices and restore the hibernation
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* snapshot image. If successful, control returns in hibernation_snaphot()
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* @platform_mode - if set, use the platform driver, if available, to
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* prepare the platform frimware for the transition.
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*
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* Must be called with pm_mutex held
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*/
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int hibernation_restore(int platform_mode)
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{
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int error;
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pm_prepare_console();
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suspend_console();
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error = device_suspend(PMSG_PRETHAW);
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if (error)
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goto Finish;
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error = platform_pre_restore(platform_mode);
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if (!error) {
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error = disable_nonboot_cpus();
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if (!error)
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error = swsusp_resume();
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enable_nonboot_cpus();
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}
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platform_restore_cleanup(platform_mode);
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device_resume();
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Finish:
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resume_console();
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pm_restore_console();
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return error;
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}
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/**
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* hibernation_platform_enter - enter the hibernation state using the
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* platform driver (if available)
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*/
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int hibernation_platform_enter(void)
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{
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int error;
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if (!hibernation_ops)
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return -ENOSYS;
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/*
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* We have cancelled the power transition by running
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* hibernation_ops->finish() before saving the image, so we should let
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* the firmware know that we're going to enter the sleep state after all
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*/
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error = hibernation_ops->start();
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if (error)
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return error;
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suspend_console();
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error = device_suspend(PMSG_SUSPEND);
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if (error)
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goto Resume_console;
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error = hibernation_ops->prepare();
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if (error)
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goto Resume_devices;
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error = disable_nonboot_cpus();
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if (error)
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goto Finish;
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local_irq_disable();
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error = device_power_down(PMSG_SUSPEND);
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if (!error) {
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hibernation_ops->enter();
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/* We should never get here */
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while (1);
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}
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local_irq_enable();
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/*
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* We don't need to reenable the nonboot CPUs or resume consoles, since
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* the system is going to be halted anyway.
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*/
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Finish:
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hibernation_ops->finish();
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Resume_devices:
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device_resume();
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Resume_console:
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resume_console();
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return error;
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}
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/**
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* power_down - Shut the machine down for hibernation.
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*
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* Use the platform driver, if configured so; otherwise try
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* to power off or reboot.
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*/
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static void power_down(void)
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{
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switch (hibernation_mode) {
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case HIBERNATION_TEST:
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case HIBERNATION_TESTPROC:
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break;
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case HIBERNATION_REBOOT:
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kernel_restart(NULL);
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break;
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case HIBERNATION_PLATFORM:
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hibernation_platform_enter();
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case HIBERNATION_SHUTDOWN:
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kernel_power_off();
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break;
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}
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kernel_halt();
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/*
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* Valid image is on the disk, if we continue we risk serious data
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* corruption after resume.
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*/
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printk(KERN_CRIT "Please power me down manually\n");
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while(1);
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}
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static void unprepare_processes(void)
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{
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thaw_processes();
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pm_restore_console();
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}
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static int prepare_processes(void)
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{
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int error = 0;
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pm_prepare_console();
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if (freeze_processes()) {
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error = -EBUSY;
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unprepare_processes();
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}
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return error;
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}
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/**
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* hibernate - The granpappy of the built-in hibernation management
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*/
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int hibernate(void)
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{
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int error;
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mutex_lock(&pm_mutex);
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/* The snapshot device should not be opened while we're running */
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if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
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error = -EBUSY;
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goto Unlock;
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}
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error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
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if (error)
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goto Exit;
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/* Allocate memory management structures */
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error = create_basic_memory_bitmaps();
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if (error)
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goto Exit;
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printk("Syncing filesystems ... ");
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sys_sync();
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printk("done.\n");
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error = prepare_processes();
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if (error)
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goto Finish;
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if (hibernation_mode == HIBERNATION_TESTPROC) {
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printk("swsusp debug: Waiting for 5 seconds.\n");
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mdelay(5000);
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goto Thaw;
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}
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error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
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if (in_suspend && !error) {
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unsigned int flags = 0;
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if (hibernation_mode == HIBERNATION_PLATFORM)
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flags |= SF_PLATFORM_MODE;
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pr_debug("PM: writing image.\n");
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error = swsusp_write(flags);
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swsusp_free();
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if (!error)
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power_down();
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} else {
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pr_debug("PM: Image restored successfully.\n");
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swsusp_free();
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}
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Thaw:
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unprepare_processes();
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Finish:
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free_basic_memory_bitmaps();
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Exit:
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pm_notifier_call_chain(PM_POST_HIBERNATION);
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atomic_inc(&snapshot_device_available);
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Unlock:
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mutex_unlock(&pm_mutex);
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return error;
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}
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/**
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* software_resume - Resume from a saved image.
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*
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* Called as a late_initcall (so all devices are discovered and
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* initialized), we call swsusp to see if we have a saved image or not.
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* If so, we quiesce devices, the restore the saved image. We will
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* return above (in hibernate() ) if everything goes well.
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* Otherwise, we fail gracefully and return to the normally
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* scheduled program.
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*
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*/
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static int software_resume(void)
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{
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int error;
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unsigned int flags;
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/*
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* name_to_dev_t() below takes a sysfs buffer mutex when sysfs
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* is configured into the kernel. Since the regular hibernate
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* trigger path is via sysfs which takes a buffer mutex before
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* calling hibernate functions (which take pm_mutex) this can
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* cause lockdep to complain about a possible ABBA deadlock
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* which cannot happen since we're in the boot code here and
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* sysfs can't be invoked yet. Therefore, we use a subclass
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* here to avoid lockdep complaining.
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*/
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mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
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if (!swsusp_resume_device) {
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if (!strlen(resume_file)) {
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mutex_unlock(&pm_mutex);
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return -ENOENT;
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}
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swsusp_resume_device = name_to_dev_t(resume_file);
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pr_debug("swsusp: Resume From Partition %s\n", resume_file);
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} else {
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pr_debug("swsusp: Resume From Partition %d:%d\n",
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MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
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}
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if (noresume) {
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/**
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* FIXME: If noresume is specified, we need to find the partition
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* and reset it back to normal swap space.
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*/
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mutex_unlock(&pm_mutex);
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return 0;
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}
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pr_debug("PM: Checking swsusp image.\n");
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error = swsusp_check();
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if (error)
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goto Unlock;
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/* The snapshot device should not be opened while we're running */
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if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
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error = -EBUSY;
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goto Unlock;
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}
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error = create_basic_memory_bitmaps();
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if (error)
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goto Finish;
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pr_debug("PM: Preparing processes for restore.\n");
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error = prepare_processes();
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if (error) {
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swsusp_close();
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goto Done;
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}
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pr_debug("PM: Reading swsusp image.\n");
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error = swsusp_read(&flags);
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if (!error)
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hibernation_restore(flags & SF_PLATFORM_MODE);
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printk(KERN_ERR "PM: Restore failed, recovering.\n");
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swsusp_free();
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unprepare_processes();
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Done:
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free_basic_memory_bitmaps();
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Finish:
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atomic_inc(&snapshot_device_available);
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/* For success case, the suspend path will release the lock */
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Unlock:
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mutex_unlock(&pm_mutex);
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pr_debug("PM: Resume from disk failed.\n");
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return error;
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}
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late_initcall(software_resume);
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static const char * const hibernation_modes[] = {
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[HIBERNATION_PLATFORM] = "platform",
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[HIBERNATION_SHUTDOWN] = "shutdown",
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[HIBERNATION_REBOOT] = "reboot",
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[HIBERNATION_TEST] = "test",
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[HIBERNATION_TESTPROC] = "testproc",
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};
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/**
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* disk - Control hibernation mode
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*
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* Suspend-to-disk can be handled in several ways. We have a few options
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* for putting the system to sleep - using the platform driver (e.g. ACPI
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* or other hibernation_ops), powering off the system or rebooting the
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* system (for testing) as well as the two test modes.
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*
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* The system can support 'platform', and that is known a priori (and
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* encoded by the presence of hibernation_ops). However, the user may
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* choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
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* test modes, 'test' or 'testproc'.
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*
|
|
* show() will display what the mode is currently set to.
|
|
* store() will accept one of
|
|
*
|
|
* 'platform'
|
|
* 'shutdown'
|
|
* 'reboot'
|
|
* 'test'
|
|
* 'testproc'
|
|
*
|
|
* It will only change to 'platform' if the system
|
|
* supports it (as determined by having hibernation_ops).
|
|
*/
|
|
|
|
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:
|
|
case HIBERNATION_TEST:
|
|
case HIBERNATION_TESTPROC:
|
|
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;
|
|
|
|
mutex_lock(&pm_mutex);
|
|
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:
|
|
case HIBERNATION_TEST:
|
|
case HIBERNATION_TESTPROC:
|
|
hibernation_mode = mode;
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
if (hibernation_ops)
|
|
hibernation_mode = mode;
|
|
else
|
|
error = -EINVAL;
|
|
}
|
|
} else
|
|
error = -EINVAL;
|
|
|
|
if (!error)
|
|
pr_debug("PM: suspend-to-disk mode set to '%s'\n",
|
|
hibernation_modes[mode]);
|
|
mutex_unlock(&pm_mutex);
|
|
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;
|
|
|
|
mutex_lock(&pm_mutex);
|
|
swsusp_resume_device = res;
|
|
mutex_unlock(&pm_mutex);
|
|
printk("Attempting manual resume\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 struct attribute * g[] = {
|
|
&disk_attr.attr,
|
|
&resume_attr.attr,
|
|
&image_size_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
|
|
static struct attribute_group attr_group = {
|
|
.attrs = g,
|
|
};
|
|
|
|
|
|
static int __init pm_disk_init(void)
|
|
{
|
|
return sysfs_create_group(&power_kset->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 noresume_setup(char *str)
|
|
{
|
|
noresume = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("noresume", noresume_setup);
|
|
__setup("resume_offset=", resume_offset_setup);
|
|
__setup("resume=", resume_setup);
|