aboutsummaryrefslogtreecommitdiff
path: root/kernel/power/swsusp.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/power/swsusp.c')
-rw-r--r--kernel/power/swsusp.c287
1 files changed, 0 insertions, 287 deletions
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
deleted file mode 100644
index 0b66659dc51..00000000000
--- a/kernel/power/swsusp.c
+++ /dev/null
@@ -1,287 +0,0 @@
-/*
- * linux/kernel/power/swsusp.c
- *
- * This file provides code to write suspend image to swap and read it back.
- *
- * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
- * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@suse.cz>
- *
- * This file is released under the GPLv2.
- *
- * I'd like to thank the following people for their work:
- *
- * Pavel Machek <pavel@ucw.cz>:
- * Modifications, defectiveness pointing, being with me at the very beginning,
- * suspend to swap space, stop all tasks. Port to 2.4.18-ac and 2.5.17.
- *
- * Steve Doddi <dirk@loth.demon.co.uk>:
- * Support the possibility of hardware state restoring.
- *
- * Raph <grey.havens@earthling.net>:
- * Support for preserving states of network devices and virtual console
- * (including X and svgatextmode)
- *
- * Kurt Garloff <garloff@suse.de>:
- * Straightened the critical function in order to prevent compilers from
- * playing tricks with local variables.
- *
- * Andreas Mohr <a.mohr@mailto.de>
- *
- * Alex Badea <vampire@go.ro>:
- * Fixed runaway init
- *
- * Rafael J. Wysocki <rjw@sisk.pl>
- * Reworked the freeing of memory and the handling of swap
- *
- * More state savers are welcome. Especially for the scsi layer...
- *
- * For TODOs,FIXMEs also look in Documentation/power/swsusp.txt
- */
-
-#include <linux/mm.h>
-#include <linux/suspend.h>
-#include <linux/spinlock.h>
-#include <linux/kernel.h>
-#include <linux/major.h>
-#include <linux/swap.h>
-#include <linux/pm.h>
-#include <linux/swapops.h>
-#include <linux/bootmem.h>
-#include <linux/syscalls.h>
-#include <linux/highmem.h>
-
-#include "power.h"
-
-/*
- * Preferred image size in bytes (tunable via /sys/power/image_size).
- * When it is set to N, swsusp will do its best to ensure the image
- * size will not exceed N bytes, but if that is impossible, it will
- * try to create the smallest image possible.
- */
-unsigned long image_size = 500 * 1024 * 1024;
-
-int in_suspend __nosavedata = 0;
-
-#ifdef CONFIG_HIGHMEM
-unsigned int count_highmem_pages(void);
-int save_highmem(void);
-int restore_highmem(void);
-#else
-static inline int save_highmem(void) { return 0; }
-static inline int restore_highmem(void) { return 0; }
-static inline unsigned int count_highmem_pages(void) { return 0; }
-#endif
-
-/**
- * The following functions are used for tracing the allocated
- * swap pages, so that they can be freed in case of an error.
- *
- * The functions operate on a linked bitmap structure defined
- * in power.h
- */
-
-void free_bitmap(struct bitmap_page *bitmap)
-{
- struct bitmap_page *bp;
-
- while (bitmap) {
- bp = bitmap->next;
- free_page((unsigned long)bitmap);
- bitmap = bp;
- }
-}
-
-struct bitmap_page *alloc_bitmap(unsigned int nr_bits)
-{
- struct bitmap_page *bitmap, *bp;
- unsigned int n;
-
- if (!nr_bits)
- return NULL;
-
- bitmap = (struct bitmap_page *)get_zeroed_page(GFP_KERNEL);
- bp = bitmap;
- for (n = BITMAP_PAGE_BITS; n < nr_bits; n += BITMAP_PAGE_BITS) {
- bp->next = (struct bitmap_page *)get_zeroed_page(GFP_KERNEL);
- bp = bp->next;
- if (!bp) {
- free_bitmap(bitmap);
- return NULL;
- }
- }
- return bitmap;
-}
-
-static int bitmap_set(struct bitmap_page *bitmap, unsigned long bit)
-{
- unsigned int n;
-
- n = BITMAP_PAGE_BITS;
- while (bitmap && n <= bit) {
- n += BITMAP_PAGE_BITS;
- bitmap = bitmap->next;
- }
- if (!bitmap)
- return -EINVAL;
- n -= BITMAP_PAGE_BITS;
- bit -= n;
- n = 0;
- while (bit >= BITS_PER_CHUNK) {
- bit -= BITS_PER_CHUNK;
- n++;
- }
- bitmap->chunks[n] |= (1UL << bit);
- return 0;
-}
-
-unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap)
-{
- unsigned long offset;
-
- offset = swp_offset(get_swap_page_of_type(swap));
- if (offset) {
- if (bitmap_set(bitmap, offset)) {
- swap_free(swp_entry(swap, offset));
- offset = 0;
- }
- }
- return offset;
-}
-
-void free_all_swap_pages(int swap, struct bitmap_page *bitmap)
-{
- unsigned int bit, n;
- unsigned long test;
-
- bit = 0;
- while (bitmap) {
- for (n = 0; n < BITMAP_PAGE_CHUNKS; n++)
- for (test = 1UL; test; test <<= 1) {
- if (bitmap->chunks[n] & test)
- swap_free(swp_entry(swap, bit));
- bit++;
- }
- bitmap = bitmap->next;
- }
-}
-
-/**
- * swsusp_shrink_memory - Try to free as much memory as needed
- *
- * ... but do not OOM-kill anyone
- *
- * Notice: all userland should be stopped before it is called, or
- * livelock is possible.
- */
-
-#define SHRINK_BITE 10000
-static inline unsigned long __shrink_memory(long tmp)
-{
- if (tmp > SHRINK_BITE)
- tmp = SHRINK_BITE;
- return shrink_all_memory(tmp);
-}
-
-int swsusp_shrink_memory(void)
-{
- long size, tmp;
- struct zone *zone;
- unsigned long pages = 0;
- unsigned int i = 0;
- char *p = "-\\|/";
-
- printk("Shrinking memory... ");
- do {
- size = 2 * count_highmem_pages();
- size += size / 50 + count_data_pages() + PAGES_FOR_IO;
- tmp = size;
- for_each_zone (zone)
- if (!is_highmem(zone) && populated_zone(zone)) {
- tmp -= zone->free_pages;
- tmp += zone->lowmem_reserve[ZONE_NORMAL];
- tmp += snapshot_additional_pages(zone);
- }
- if (tmp > 0) {
- tmp = __shrink_memory(tmp);
- if (!tmp)
- return -ENOMEM;
- pages += tmp;
- } else if (size > image_size / PAGE_SIZE) {
- tmp = __shrink_memory(size - (image_size / PAGE_SIZE));
- pages += tmp;
- }
- printk("\b%c", p[i++%4]);
- } while (tmp > 0);
- printk("\bdone (%lu pages freed)\n", pages);
-
- return 0;
-}
-
-int swsusp_suspend(void)
-{
- int error;
-
- if ((error = arch_prepare_suspend()))
- return error;
- local_irq_disable();
- /* At this point, device_suspend() has been called, but *not*
- * device_power_down(). We *must* device_power_down() now.
- * Otherwise, drivers for some devices (e.g. interrupt controllers)
- * become desynchronized with the actual state of the hardware
- * at resume time, and evil weirdness ensues.
- */
- if ((error = device_power_down(PMSG_FREEZE))) {
- printk(KERN_ERR "Some devices failed to power down, aborting suspend\n");
- goto Enable_irqs;
- }
-
- if ((error = save_highmem())) {
- printk(KERN_ERR "swsusp: Not enough free pages for highmem\n");
- goto Restore_highmem;
- }
-
- save_processor_state();
- if ((error = swsusp_arch_suspend()))
- printk(KERN_ERR "Error %d suspending\n", error);
- /* Restore control flow magically appears here */
- restore_processor_state();
-Restore_highmem:
- restore_highmem();
- /* NOTE: device_power_up() is just a resume() for devices
- * that suspended with irqs off ... no overall powerup.
- */
- device_power_up();
-Enable_irqs:
- local_irq_enable();
- return error;
-}
-
-int swsusp_resume(void)
-{
- int error;
-
- local_irq_disable();
- /* NOTE: device_power_down() is just a suspend() with irqs off;
- * it has no special "power things down" semantics
- */
- if (device_power_down(PMSG_PRETHAW))
- printk(KERN_ERR "Some devices failed to power down, very bad\n");
- /* We'll ignore saved state, but this gets preempt count (etc) right */
- save_processor_state();
- error = swsusp_arch_resume();
- /* Code below is only ever reached in case of failure. Otherwise
- * execution continues at place where swsusp_arch_suspend was called
- */
- BUG_ON(!error);
- /* 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();
- restore_highmem();
- touch_softlockup_watchdog();
- device_power_up();
- local_irq_enable();
- return error;
-}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-07 06:42:54 +0000