2005-04-17 06:20:36 +08:00
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/*
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* linux/kernel/power/swsusp.c
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*
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2005-10-31 06:59:58 +08:00
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* This file provides code to write suspend image to swap and read it back.
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2005-04-17 06:20:36 +08:00
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*
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* Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
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2005-10-31 06:59:56 +08:00
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* Copyright (C) 1998,2001-2005 Pavel Machek <pavel@suse.cz>
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2005-04-17 06:20:36 +08:00
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*
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* This file is released under the GPLv2.
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*
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* I'd like to thank the following people for their work:
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2005-06-26 05:55:12 +08:00
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*
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2005-04-17 06:20:36 +08:00
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* Pavel Machek <pavel@ucw.cz>:
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* Modifications, defectiveness pointing, being with me at the very beginning,
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* suspend to swap space, stop all tasks. Port to 2.4.18-ac and 2.5.17.
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*
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2005-06-26 05:55:12 +08:00
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* Steve Doddi <dirk@loth.demon.co.uk>:
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2005-04-17 06:20:36 +08:00
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* Support the possibility of hardware state restoring.
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*
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* Raph <grey.havens@earthling.net>:
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* Support for preserving states of network devices and virtual console
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* (including X and svgatextmode)
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*
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* Kurt Garloff <garloff@suse.de>:
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* Straightened the critical function in order to prevent compilers from
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* playing tricks with local variables.
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*
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* Andreas Mohr <a.mohr@mailto.de>
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*
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* Alex Badea <vampire@go.ro>:
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* Fixed runaway init
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*
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2006-01-06 16:13:05 +08:00
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* Rafael J. Wysocki <rjw@sisk.pl>
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2006-03-23 19:00:00 +08:00
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* Reworked the freeing of memory and the handling of swap
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2006-01-06 16:13:05 +08:00
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*
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2005-04-17 06:20:36 +08:00
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* More state savers are welcome. Especially for the scsi layer...
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*
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* For TODOs,FIXMEs also look in Documentation/power/swsusp.txt
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*/
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#include <linux/mm.h>
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#include <linux/suspend.h>
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#include <linux/spinlock.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/swap.h>
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#include <linux/pm.h>
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#include <linux/swapops.h>
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#include <linux/bootmem.h>
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#include <linux/syscalls.h>
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#include <linux/highmem.h>
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2006-12-07 12:34:32 +08:00
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#include <linux/time.h>
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2007-05-07 05:50:47 +08:00
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#include <linux/rbtree.h>
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2009-04-01 06:23:37 +08:00
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#include <linux/io.h>
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2005-04-17 06:20:36 +08:00
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#include "power.h"
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2006-03-23 18:59:59 +08:00
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int in_suspend __nosavedata = 0;
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2005-04-17 06:20:36 +08:00
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/**
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2006-03-23 18:59:59 +08:00
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* The following functions are used for tracing the allocated
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* swap pages, so that they can be freed in case of an error.
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2005-04-17 06:20:36 +08:00
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*/
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2006-01-06 16:13:05 +08:00
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2007-05-07 05:50:47 +08:00
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struct swsusp_extent {
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struct rb_node node;
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unsigned long start;
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unsigned long end;
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};
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2005-04-17 06:20:36 +08:00
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2007-05-07 05:50:47 +08:00
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static struct rb_root swsusp_extents = RB_ROOT;
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2006-01-06 16:13:05 +08:00
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2007-05-07 05:50:47 +08:00
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static int swsusp_extents_insert(unsigned long swap_offset)
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2006-01-06 16:13:05 +08:00
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{
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2007-05-07 05:50:47 +08:00
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struct rb_node **new = &(swsusp_extents.rb_node);
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struct rb_node *parent = NULL;
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struct swsusp_extent *ext;
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/* Figure out where to put the new node */
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while (*new) {
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ext = container_of(*new, struct swsusp_extent, node);
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parent = *new;
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if (swap_offset < ext->start) {
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/* Try to merge */
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if (swap_offset == ext->start - 1) {
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ext->start--;
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return 0;
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}
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new = &((*new)->rb_left);
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} else if (swap_offset > ext->end) {
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/* Try to merge */
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if (swap_offset == ext->end + 1) {
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ext->end++;
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return 0;
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}
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new = &((*new)->rb_right);
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} else {
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/* It already is in the tree */
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return -EINVAL;
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2006-01-06 16:13:05 +08:00
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}
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2005-04-17 06:20:36 +08:00
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}
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2007-05-07 05:50:47 +08:00
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/* Add the new node and rebalance the tree. */
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ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);
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if (!ext)
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return -ENOMEM;
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ext->start = swap_offset;
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ext->end = swap_offset;
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rb_link_node(&ext->node, parent, new);
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rb_insert_color(&ext->node, &swsusp_extents);
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2006-03-23 18:59:59 +08:00
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return 0;
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2006-01-06 16:13:05 +08:00
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}
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2005-04-17 06:20:36 +08:00
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2007-05-07 05:50:47 +08:00
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/**
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* alloc_swapdev_block - allocate a swap page and register that it has
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* been allocated, so that it can be freed in case of an error.
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*/
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sector_t alloc_swapdev_block(int swap)
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2006-01-06 16:13:05 +08:00
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{
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2006-03-23 18:59:59 +08:00
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unsigned long offset;
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offset = swp_offset(get_swap_page_of_type(swap));
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if (offset) {
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2007-05-07 05:50:47 +08:00
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if (swsusp_extents_insert(offset))
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2006-03-23 18:59:59 +08:00
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swap_free(swp_entry(swap, offset));
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2006-12-07 12:34:10 +08:00
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else
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return swapdev_block(swap, offset);
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2006-01-06 16:13:05 +08:00
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}
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2006-12-07 12:34:10 +08:00
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return 0;
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2006-01-06 16:13:05 +08:00
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}
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2005-04-17 06:20:36 +08:00
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2007-05-07 05:50:47 +08:00
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/**
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* free_all_swap_pages - free swap pages allocated for saving image data.
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* It also frees the extents used to register which swap entres had been
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* allocated.
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*/
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void free_all_swap_pages(int swap)
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2006-01-06 16:13:05 +08:00
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{
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2007-05-07 05:50:47 +08:00
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struct rb_node *node;
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while ((node = swsusp_extents.rb_node)) {
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struct swsusp_extent *ext;
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unsigned long offset;
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ext = container_of(node, struct swsusp_extent, node);
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rb_erase(node, &swsusp_extents);
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for (offset = ext->start; offset <= ext->end; offset++)
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swap_free(swp_entry(swap, offset));
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kfree(ext);
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2005-04-17 06:20:36 +08:00
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}
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2006-01-06 16:13:05 +08:00
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}
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2007-05-07 05:50:47 +08:00
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int swsusp_swap_in_use(void)
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{
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return (swsusp_extents.rb_node != NULL);
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}
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2006-12-07 12:34:32 +08:00
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/**
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* swsusp_show_speed - print the time elapsed between two events represented by
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* @start and @stop
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*
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* @nr_pages - number of pages processed between @start and @stop
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* @msg - introductory 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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2007-12-08 09:09:43 +08:00
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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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2006-12-07 12:34:32 +08:00
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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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