/*
* linux/kernel/power/snapshot.c
*
- * This file provide system snapshot/restore functionality.
+ * This file provides system snapshot/restore functionality for swsusp.
*
* Copyright (C) 1998-2005 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
*
- * This file is released under the GPLv2, and is based on swsusp.c.
+ * This file is released under the GPLv2.
*
*/
-
+#include <linux/version.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/suspend.h>
#include "power.h"
-struct pbe *pagedir_nosave;
-unsigned int nr_copy_pages;
+/* List of PBEs needed for restoring the pages that were allocated before
+ * the suspend and included in the suspend image, but have also been
+ * allocated by the "resume" kernel, so their contents cannot be written
+ * directly to their "original" page frames.
+ */
+struct pbe *restore_pblist;
-#ifdef CONFIG_HIGHMEM
-unsigned int count_highmem_pages(void)
+/* Pointer to an auxiliary buffer (1 page) */
+static void *buffer;
+
+/**
+ * @safe_needed - on resume, for storing the PBE list and the image,
+ * we can only use memory pages that do not conflict with the pages
+ * used before suspend. The unsafe pages have PageNosaveFree set
+ * and we count them using unsafe_pages.
+ *
+ * Each allocated image page is marked as PageNosave and PageNosaveFree
+ * so that swsusp_free() can release it.
+ */
+
+#define PG_ANY 0
+#define PG_SAFE 1
+#define PG_UNSAFE_CLEAR 1
+#define PG_UNSAFE_KEEP 0
+
+static unsigned int allocated_unsafe_pages;
+
+static void *get_image_page(gfp_t gfp_mask, int safe_needed)
{
- struct zone *zone;
- unsigned long zone_pfn;
- unsigned int n = 0;
+ void *res;
- for_each_zone (zone)
- if (is_highmem(zone)) {
- mark_free_pages(zone);
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; zone_pfn++) {
- struct page *page;
- unsigned long pfn = zone_pfn + zone->zone_start_pfn;
- if (!pfn_valid(pfn))
- continue;
- page = pfn_to_page(pfn);
- if (PageReserved(page))
- continue;
- if (PageNosaveFree(page))
- continue;
- n++;
- }
+ res = (void *)get_zeroed_page(gfp_mask);
+ if (safe_needed)
+ while (res && PageNosaveFree(virt_to_page(res))) {
+ /* The page is unsafe, mark it for swsusp_free() */
+ SetPageNosave(virt_to_page(res));
+ allocated_unsafe_pages++;
+ res = (void *)get_zeroed_page(gfp_mask);
}
- return n;
+ if (res) {
+ SetPageNosave(virt_to_page(res));
+ SetPageNosaveFree(virt_to_page(res));
+ }
+ return res;
+}
+
+unsigned long get_safe_page(gfp_t gfp_mask)
+{
+ return (unsigned long)get_image_page(gfp_mask, PG_SAFE);
}
-struct highmem_page {
- char *data;
+static struct page *alloc_image_page(gfp_t gfp_mask)
+{
struct page *page;
- struct highmem_page *next;
-};
-static struct highmem_page *highmem_copy;
+ page = alloc_page(gfp_mask);
+ if (page) {
+ SetPageNosave(page);
+ SetPageNosaveFree(page);
+ }
+ return page;
+}
+
+/**
+ * free_image_page - free page represented by @addr, allocated with
+ * get_image_page (page flags set by it must be cleared)
+ */
-static int save_highmem_zone(struct zone *zone)
+static inline void free_image_page(void *addr, int clear_nosave_free)
{
- unsigned long zone_pfn;
- mark_free_pages(zone);
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) {
- struct page *page;
- struct highmem_page *save;
- void *kaddr;
- unsigned long pfn = zone_pfn + zone->zone_start_pfn;
+ struct page *page;
- if (!(pfn%1000))
- printk(".");
- if (!pfn_valid(pfn))
- continue;
- page = pfn_to_page(pfn);
- /*
- * This condition results from rvmalloc() sans vmalloc_32()
- * and architectural memory reservations. This should be
- * corrected eventually when the cases giving rise to this
- * are better understood.
- */
- if (PageReserved(page))
- continue;
- BUG_ON(PageNosave(page));
- if (PageNosaveFree(page))
- continue;
- save = kmalloc(sizeof(struct highmem_page), GFP_ATOMIC);
- if (!save)
- return -ENOMEM;
- save->next = highmem_copy;
- save->page = page;
- save->data = (void *) get_zeroed_page(GFP_ATOMIC);
- if (!save->data) {
- kfree(save);
- return -ENOMEM;
- }
- kaddr = kmap_atomic(page, KM_USER0);
- memcpy(save->data, kaddr, PAGE_SIZE);
- kunmap_atomic(kaddr, KM_USER0);
- highmem_copy = save;
- }
- return 0;
+ BUG_ON(!virt_addr_valid(addr));
+
+ page = virt_to_page(addr);
+
+ ClearPageNosave(page);
+ if (clear_nosave_free)
+ ClearPageNosaveFree(page);
+
+ __free_page(page);
}
-int save_highmem(void)
+/* struct linked_page is used to build chains of pages */
+
+#define LINKED_PAGE_DATA_SIZE (PAGE_SIZE - sizeof(void *))
+
+struct linked_page {
+ struct linked_page *next;
+ char data[LINKED_PAGE_DATA_SIZE];
+} __attribute__((packed));
+
+static inline void
+free_list_of_pages(struct linked_page *list, int clear_page_nosave)
{
- struct zone *zone;
- int res = 0;
+ while (list) {
+ struct linked_page *lp = list->next;
- pr_debug("swsusp: Saving Highmem\n");
- for_each_zone (zone) {
- if (is_highmem(zone))
- res = save_highmem_zone(zone);
- if (res)
- return res;
+ free_image_page(list, clear_page_nosave);
+ list = lp;
}
- return 0;
}
-int restore_highmem(void)
+/**
+ * struct chain_allocator is used for allocating small objects out of
+ * a linked list of pages called 'the chain'.
+ *
+ * The chain grows each time when there is no room for a new object in
+ * the current page. The allocated objects cannot be freed individually.
+ * It is only possible to free them all at once, by freeing the entire
+ * chain.
+ *
+ * NOTE: The chain allocator may be inefficient if the allocated objects
+ * are not much smaller than PAGE_SIZE.
+ */
+
+struct chain_allocator {
+ struct linked_page *chain; /* the chain */
+ unsigned int used_space; /* total size of objects allocated out
+ * of the current page
+ */
+ gfp_t gfp_mask; /* mask for allocating pages */
+ int safe_needed; /* if set, only "safe" pages are allocated */
+};
+
+static void
+chain_init(struct chain_allocator *ca, gfp_t gfp_mask, int safe_needed)
+{
+ ca->chain = NULL;
+ ca->used_space = LINKED_PAGE_DATA_SIZE;
+ ca->gfp_mask = gfp_mask;
+ ca->safe_needed = safe_needed;
+}
+
+static void *chain_alloc(struct chain_allocator *ca, unsigned int size)
{
- printk("swsusp: Restoring Highmem\n");
- while (highmem_copy) {
- struct highmem_page *save = highmem_copy;
- void *kaddr;
- highmem_copy = save->next;
+ void *ret;
- kaddr = kmap_atomic(save->page, KM_USER0);
- memcpy(kaddr, save->data, PAGE_SIZE);
- kunmap_atomic(kaddr, KM_USER0);
- free_page((long) save->data);
- kfree(save);
+ if (LINKED_PAGE_DATA_SIZE - ca->used_space < size) {
+ struct linked_page *lp;
+
+ lp = get_image_page(ca->gfp_mask, ca->safe_needed);
+ if (!lp)
+ return NULL;
+
+ lp->next = ca->chain;
+ ca->chain = lp;
+ ca->used_space = 0;
}
- return 0;
+ ret = ca->chain->data + ca->used_space;
+ ca->used_space += size;
+ return ret;
}
-#endif
-static int pfn_is_nosave(unsigned long pfn)
+static void chain_free(struct chain_allocator *ca, int clear_page_nosave)
{
- unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
- unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
- return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
+ free_list_of_pages(ca->chain, clear_page_nosave);
+ memset(ca, 0, sizeof(struct chain_allocator));
}
/**
- * saveable - Determine whether a page should be cloned or not.
- * @pfn: The page
+ * Data types related to memory bitmaps.
+ *
+ * Memory bitmap is a structure consiting of many linked lists of
+ * objects. The main list's elements are of type struct zone_bitmap
+ * and each of them corresonds to one zone. For each zone bitmap
+ * object there is a list of objects of type struct bm_block that
+ * represent each blocks of bit chunks in which information is
+ * stored.
+ *
+ * struct memory_bitmap contains a pointer to the main list of zone
+ * bitmap objects, a struct bm_position used for browsing the bitmap,
+ * and a pointer to the list of pages used for allocating all of the
+ * zone bitmap objects and bitmap block objects.
*
- * We save a page if it's Reserved, and not in the range of pages
- * statically defined as 'unsaveable', or if it isn't reserved, and
- * isn't part of a free chunk of pages.
+ * NOTE: It has to be possible to lay out the bitmap in memory
+ * using only allocations of order 0. Additionally, the bitmap is
+ * designed to work with arbitrary number of zones (this is over the
+ * top for now, but let's avoid making unnecessary assumptions ;-).
+ *
+ * struct zone_bitmap contains a pointer to a list of bitmap block
+ * objects and a pointer to the bitmap block object that has been
+ * most recently used for setting bits. Additionally, it contains the
+ * pfns that correspond to the start and end of the represented zone.
+ *
+ * struct bm_block contains a pointer to the memory page in which
+ * information is stored (in the form of a block of bit chunks
+ * of type unsigned long each). It also contains the pfns that
+ * correspond to the start and end of the represented memory area and
+ * the number of bit chunks in the block.
+ *
+ * NOTE: Memory bitmaps are used for two types of operations only:
+ * "set a bit" and "find the next bit set". Moreover, the searching
+ * is always carried out after all of the "set a bit" operations
+ * on given bitmap.
*/
-static int saveable(struct zone *zone, unsigned long *zone_pfn)
-{
- unsigned long pfn = *zone_pfn + zone->zone_start_pfn;
- struct page *page;
+#define BM_END_OF_MAP (~0UL)
- if (!pfn_valid(pfn))
- return 0;
+#define BM_CHUNKS_PER_BLOCK (PAGE_SIZE / sizeof(long))
+#define BM_BITS_PER_CHUNK (sizeof(long) << 3)
+#define BM_BITS_PER_BLOCK (PAGE_SIZE << 3)
- page = pfn_to_page(pfn);
- BUG_ON(PageReserved(page) && PageNosave(page));
- if (PageNosave(page))
- return 0;
- if (PageReserved(page) && pfn_is_nosave(pfn))
- return 0;
- if (PageNosaveFree(page))
- return 0;
+struct bm_block {
+ struct bm_block *next; /* next element of the list */
+ unsigned long start_pfn; /* pfn represented by the first bit */
+ unsigned long end_pfn; /* pfn represented by the last bit plus 1 */
+ unsigned int size; /* number of bit chunks */
+ unsigned long *data; /* chunks of bits representing pages */
+};
- return 1;
-}
+struct zone_bitmap {
+ struct zone_bitmap *next; /* next element of the list */
+ unsigned long start_pfn; /* minimal pfn in this zone */
+ unsigned long end_pfn; /* maximal pfn in this zone plus 1 */
+ struct bm_block *bm_blocks; /* list of bitmap blocks */
+ struct bm_block *cur_block; /* recently used bitmap block */
+};
-unsigned int count_data_pages(void)
-{
- struct zone *zone;
- unsigned long zone_pfn;
- unsigned int n = 0;
+/* strcut bm_position is used for browsing memory bitmaps */
- for_each_zone (zone) {
- if (is_highmem(zone))
- continue;
- mark_free_pages(zone);
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
- n += saveable(zone, &zone_pfn);
- }
- return n;
+struct bm_position {
+ struct zone_bitmap *zone_bm;
+ struct bm_block *block;
+ int chunk;
+ int bit;
+};
+
+struct memory_bitmap {
+ struct zone_bitmap *zone_bm_list; /* list of zone bitmaps */
+ struct linked_page *p_list; /* list of pages used to store zone
+ * bitmap objects and bitmap block
+ * objects
+ */
+ struct bm_position cur; /* most recently used bit position */
+};
+
+/* Functions that operate on memory bitmaps */
+
+static inline void memory_bm_reset_chunk(struct memory_bitmap *bm)
+{
+ bm->cur.chunk = 0;
+ bm->cur.bit = -1;
}
-static void copy_data_pages(struct pbe *pblist)
+static void memory_bm_position_reset(struct memory_bitmap *bm)
{
- struct zone *zone;
- unsigned long zone_pfn;
- struct pbe *pbe, *p;
+ struct zone_bitmap *zone_bm;
- pbe = pblist;
- for_each_zone (zone) {
- if (is_highmem(zone))
- continue;
- mark_free_pages(zone);
- /* This is necessary for swsusp_free() */
- for_each_pb_page (p, pblist)
- SetPageNosaveFree(virt_to_page(p));
- for_each_pbe (p, pblist)
- SetPageNosaveFree(virt_to_page(p->address));
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) {
- if (saveable(zone, &zone_pfn)) {
- struct page *page;
- page = pfn_to_page(zone_pfn + zone->zone_start_pfn);
- BUG_ON(!pbe);
- pbe->orig_address = (unsigned long)page_address(page);
- /* copy_page is not usable for copying task structs. */
- memcpy((void *)pbe->address, (void *)pbe->orig_address, PAGE_SIZE);
- pbe = pbe->next;
- }
- }
- }
- BUG_ON(pbe);
+ zone_bm = bm->zone_bm_list;
+ bm->cur.zone_bm = zone_bm;
+ bm->cur.block = zone_bm->bm_blocks;
+ memory_bm_reset_chunk(bm);
}
+static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free);
/**
- * free_pagedir - free pages allocated with alloc_pagedir()
+ * create_bm_block_list - create a list of block bitmap objects
*/
-void free_pagedir(struct pbe *pblist)
+static inline struct bm_block *
+create_bm_block_list(unsigned int nr_blocks, struct chain_allocator *ca)
{
- struct pbe *pbe;
+ struct bm_block *bblist = NULL;
+
+ while (nr_blocks-- > 0) {
+ struct bm_block *bb;
+
+ bb = chain_alloc(ca, sizeof(struct bm_block));
+ if (!bb)
+ return NULL;
- while (pblist) {
- pbe = (pblist + PB_PAGE_SKIP)->next;
- ClearPageNosave(virt_to_page(pblist));
- ClearPageNosaveFree(virt_to_page(pblist));
- free_page((unsigned long)pblist);
- pblist = pbe;
+ bb->next = bblist;
+ bblist = bb;
}
+ return bblist;
}
/**
- * fill_pb_page - Create a list of PBEs on a given memory page
+ * create_zone_bm_list - create a list of zone bitmap objects
*/
-static inline void fill_pb_page(struct pbe *pbpage)
+static inline struct zone_bitmap *
+create_zone_bm_list(unsigned int nr_zones, struct chain_allocator *ca)
{
- struct pbe *p;
+ struct zone_bitmap *zbmlist = NULL;
- p = pbpage;
- pbpage += PB_PAGE_SKIP;
- do
- p->next = p + 1;
- while (++p < pbpage);
+ while (nr_zones-- > 0) {
+ struct zone_bitmap *zbm;
+
+ zbm = chain_alloc(ca, sizeof(struct zone_bitmap));
+ if (!zbm)
+ return NULL;
+
+ zbm->next = zbmlist;
+ zbmlist = zbm;
+ }
+ return zbmlist;
}
/**
- * create_pbe_list - Create a list of PBEs on top of a given chain
- * of memory pages allocated with alloc_pagedir()
- */
+ * memory_bm_create - allocate memory for a memory bitmap
+ */
-static inline void create_pbe_list(struct pbe *pblist, unsigned int nr_pages)
+static int
+memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask, int safe_needed)
{
- struct pbe *pbpage, *p;
- unsigned int num = PBES_PER_PAGE;
+ struct chain_allocator ca;
+ struct zone *zone;
+ struct zone_bitmap *zone_bm;
+ struct bm_block *bb;
+ unsigned int nr;
+
+ chain_init(&ca, gfp_mask, safe_needed);
+
+ /* Compute the number of zones */
+ nr = 0;
+ for_each_zone(zone)
+ if (populated_zone(zone))
+ nr++;
+
+ /* Allocate the list of zones bitmap objects */
+ zone_bm = create_zone_bm_list(nr, &ca);
+ bm->zone_bm_list = zone_bm;
+ if (!zone_bm) {
+ chain_free(&ca, PG_UNSAFE_CLEAR);
+ return -ENOMEM;
+ }
- for_each_pb_page (pbpage, pblist) {
- if (num >= nr_pages)
- break;
+ /* Initialize the zone bitmap objects */
+ for_each_zone(zone) {
+ unsigned long pfn;
+
+ if (!populated_zone(zone))
+ continue;
- fill_pb_page(pbpage);
- num += PBES_PER_PAGE;
+ zone_bm->start_pfn = zone->zone_start_pfn;
+ zone_bm->end_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ /* Allocate the list of bitmap block objects */
+ nr = DIV_ROUND_UP(zone->spanned_pages, BM_BITS_PER_BLOCK);
+ bb = create_bm_block_list(nr, &ca);
+ zone_bm->bm_blocks = bb;
+ zone_bm->cur_block = bb;
+ if (!bb)
+ goto Free;
+
+ nr = zone->spanned_pages;
+ pfn = zone->zone_start_pfn;
+ /* Initialize the bitmap block objects */
+ while (bb) {
+ unsigned long *ptr;
+
+ ptr = get_image_page(gfp_mask, safe_needed);
+ bb->data = ptr;
+ if (!ptr)
+ goto Free;
+
+ bb->start_pfn = pfn;
+ if (nr >= BM_BITS_PER_BLOCK) {
+ pfn += BM_BITS_PER_BLOCK;
+ bb->size = BM_CHUNKS_PER_BLOCK;
+ nr -= BM_BITS_PER_BLOCK;
+ } else {
+ /* This is executed only once in the loop */
+ pfn += nr;
+ bb->size = DIV_ROUND_UP(nr, BM_BITS_PER_CHUNK);
+ }
+ bb->end_pfn = pfn;
+ bb = bb->next;
+ }
+ zone_bm = zone_bm->next;
}
- if (pbpage) {
- for (num -= PBES_PER_PAGE - 1, p = pbpage; num < nr_pages; p++, num++)
- p->next = p + 1;
- p->next = NULL;
+ bm->p_list = ca.chain;
+ memory_bm_position_reset(bm);
+ return 0;
+
+ Free:
+ bm->p_list = ca.chain;
+ memory_bm_free(bm, PG_UNSAFE_CLEAR);
+ return -ENOMEM;
+}
+
+/**
+ * memory_bm_free - free memory occupied by the memory bitmap @bm
+ */
+
+static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free)
+{
+ struct zone_bitmap *zone_bm;
+
+ /* Free the list of bit blocks for each zone_bitmap object */
+ zone_bm = bm->zone_bm_list;
+ while (zone_bm) {
+ struct bm_block *bb;
+
+ bb = zone_bm->bm_blocks;
+ while (bb) {
+ if (bb->data)
+ free_image_page(bb->data, clear_nosave_free);
+ bb = bb->next;
+ }
+ zone_bm = zone_bm->next;
}
+ free_list_of_pages(bm->p_list, clear_nosave_free);
+ bm->zone_bm_list = NULL;
}
/**
- * On resume it is necessary to trace and eventually free the unsafe
- * pages that have been allocated, because they are needed for I/O
- * (on x86-64 we likely will "eat" these pages once again while
- * creating the temporary page translation tables)
+ * memory_bm_set_bit - set the bit in the bitmap @bm that corresponds
+ * to given pfn. The cur_zone_bm member of @bm and the cur_block member
+ * of @bm->cur_zone_bm are updated.
+ *
+ * If the bit cannot be set, the function returns -EINVAL .
*/
-struct eaten_page {
- struct eaten_page *next;
- char padding[PAGE_SIZE - sizeof(void *)];
-};
+static int
+memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn)
+{
+ struct zone_bitmap *zone_bm;
+ struct bm_block *bb;
+
+ /* Check if the pfn is from the current zone */
+ zone_bm = bm->cur.zone_bm;
+ if (pfn < zone_bm->start_pfn || pfn >= zone_bm->end_pfn) {
+ zone_bm = bm->zone_bm_list;
+ /* We don't assume that the zones are sorted by pfns */
+ while (pfn < zone_bm->start_pfn || pfn >= zone_bm->end_pfn) {
+ zone_bm = zone_bm->next;
+ if (unlikely(!zone_bm))
+ return -EINVAL;
+ }
+ bm->cur.zone_bm = zone_bm;
+ }
+ /* Check if the pfn corresponds to the current bitmap block */
+ bb = zone_bm->cur_block;
+ if (pfn < bb->start_pfn)
+ bb = zone_bm->bm_blocks;
+
+ while (pfn >= bb->end_pfn) {
+ bb = bb->next;
+ if (unlikely(!bb))
+ return -EINVAL;
+ }
+ zone_bm->cur_block = bb;
+ pfn -= bb->start_pfn;
+ set_bit(pfn % BM_BITS_PER_CHUNK, bb->data + pfn / BM_BITS_PER_CHUNK);
+ return 0;
+}
+
+/* Two auxiliary functions for memory_bm_next_pfn */
+
+/* Find the first set bit in the given chunk, if there is one */
+
+static inline int next_bit_in_chunk(int bit, unsigned long *chunk_p)
+{
+ bit++;
+ while (bit < BM_BITS_PER_CHUNK) {
+ if (test_bit(bit, chunk_p))
+ return bit;
+
+ bit++;
+ }
+ return -1;
+}
-static struct eaten_page *eaten_pages = NULL;
+/* Find a chunk containing some bits set in given block of bits */
-void release_eaten_pages(void)
+static inline int next_chunk_in_block(int n, struct bm_block *bb)
{
- struct eaten_page *p, *q;
+ n++;
+ while (n < bb->size) {
+ if (bb->data[n])
+ return n;
- p = eaten_pages;
- while (p) {
- q = p->next;
- /* We don't want swsusp_free() to free this page again */
- ClearPageNosave(virt_to_page(p));
- free_page((unsigned long)p);
- p = q;
+ n++;
}
- eaten_pages = NULL;
+ return -1;
}
/**
- * @safe_needed - on resume, for storing the PBE list and the image,
- * we can only use memory pages that do not conflict with the pages
- * which had been used before suspend.
+ * memory_bm_next_pfn - find the pfn that corresponds to the next set bit
+ * in the bitmap @bm. If the pfn cannot be found, BM_END_OF_MAP is
+ * returned.
*
- * The unsafe pages are marked with the PG_nosave_free flag
- *
- * Allocated but unusable (ie eaten) memory pages should be marked
- * so that swsusp_free() can release them
+ * It is required to run memory_bm_position_reset() before the first call to
+ * this function.
*/
-static inline void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
+static unsigned long memory_bm_next_pfn(struct memory_bitmap *bm)
{
- void *res;
+ struct zone_bitmap *zone_bm;
+ struct bm_block *bb;
+ int chunk;
+ int bit;
- if (safe_needed)
+ do {
+ bb = bm->cur.block;
do {
- res = (void *)get_zeroed_page(gfp_mask);
- if (res && PageNosaveFree(virt_to_page(res))) {
- /* This is for swsusp_free() */
- SetPageNosave(virt_to_page(res));
- ((struct eaten_page *)res)->next = eaten_pages;
- eaten_pages = res;
- }
- } while (res && PageNosaveFree(virt_to_page(res)));
- else
- res = (void *)get_zeroed_page(gfp_mask);
- if (res) {
- SetPageNosave(virt_to_page(res));
- SetPageNosaveFree(virt_to_page(res));
- }
- return res;
+ chunk = bm->cur.chunk;
+ bit = bm->cur.bit;
+ do {
+ bit = next_bit_in_chunk(bit, bb->data + chunk);
+ if (bit >= 0)
+ goto Return_pfn;
+
+ chunk = next_chunk_in_block(chunk, bb);
+ bit = -1;
+ } while (chunk >= 0);
+ bb = bb->next;
+ bm->cur.block = bb;
+ memory_bm_reset_chunk(bm);
+ } while (bb);
+ zone_bm = bm->cur.zone_bm->next;
+ if (zone_bm) {
+ bm->cur.zone_bm = zone_bm;
+ bm->cur.block = zone_bm->bm_blocks;
+ memory_bm_reset_chunk(bm);
+ }
+ } while (zone_bm);
+ memory_bm_position_reset(bm);
+ return BM_END_OF_MAP;
+
+ Return_pfn:
+ bm->cur.chunk = chunk;
+ bm->cur.bit = bit;
+ return bb->start_pfn + chunk * BM_BITS_PER_CHUNK + bit;
}
-unsigned long get_safe_page(gfp_t gfp_mask)
+/**
+ * snapshot_additional_pages - estimate the number of additional pages
+ * be needed for setting up the suspend image data structures for given
+ * zone (usually the returned value is greater than the exact number)
+ */
+
+unsigned int snapshot_additional_pages(struct zone *zone)
{
- return (unsigned long)alloc_image_page(gfp_mask, 1);
+ unsigned int res;
+
+ res = DIV_ROUND_UP(zone->spanned_pages, BM_BITS_PER_BLOCK);
+ res += DIV_ROUND_UP(res * sizeof(struct bm_block), PAGE_SIZE);
+ return 2 * res;
}
+#ifdef CONFIG_HIGHMEM
/**
- * alloc_pagedir - Allocate the page directory.
- *
- * First, determine exactly how many pages we need and
- * allocate them.
- *
- * We arrange the pages in a chain: each page is an array of PBES_PER_PAGE
- * struct pbe elements (pbes) and the last element in the page points
- * to the next page.
- *
- * On each page we set up a list of struct_pbe elements.
+ * count_free_highmem_pages - compute the total number of free highmem
+ * pages, system-wide.
*/
-struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask, int safe_needed)
+static unsigned int count_free_highmem_pages(void)
{
- unsigned int num;
- struct pbe *pblist, *pbe;
+ struct zone *zone;
+ unsigned int cnt = 0;
- if (!nr_pages)
- return NULL;
+ for_each_zone(zone)
+ if (populated_zone(zone) && is_highmem(zone))
+ cnt += zone->free_pages;
- pr_debug("alloc_pagedir(): nr_pages = %d\n", nr_pages);
- pblist = alloc_image_page(gfp_mask, safe_needed);
- /* FIXME: rewrite this ugly loop */
- for (pbe = pblist, num = PBES_PER_PAGE; pbe && num < nr_pages;
- pbe = pbe->next, num += PBES_PER_PAGE) {
- pbe += PB_PAGE_SKIP;
- pbe->next = alloc_image_page(gfp_mask, safe_needed);
- }
- if (!pbe) { /* get_zeroed_page() failed */
- free_pagedir(pblist);
- pblist = NULL;
- } else
- create_pbe_list(pblist, nr_pages);
- return pblist;
+ return cnt;
}
/**
- * Free pages we allocated for suspend. Suspend pages are alocated
- * before atomic copy, so we need to free them after resume.
+ * saveable_highmem_page - Determine whether a highmem page should be
+ * included in the suspend image.
+ *
+ * We should save the page if it isn't Nosave or NosaveFree, or Reserved,
+ * and it isn't a part of a free chunk of pages.
*/
-void swsusp_free(void)
+static struct page *saveable_highmem_page(unsigned long pfn)
{
- struct zone *zone;
- unsigned long zone_pfn;
+ struct page *page;
- for_each_zone(zone) {
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
- if (pfn_valid(zone_pfn + zone->zone_start_pfn)) {
- struct page *page;
- page = pfn_to_page(zone_pfn + zone->zone_start_pfn);
- if (PageNosave(page) && PageNosaveFree(page)) {
- ClearPageNosave(page);
- ClearPageNosaveFree(page);
- free_page((long) page_address(page));
- }
- }
- }
-}
+ if (!pfn_valid(pfn))
+ return NULL;
+
+ page = pfn_to_page(pfn);
+
+ BUG_ON(!PageHighMem(page));
+
+ if (PageNosave(page) || PageReserved(page) || PageNosaveFree(page))
+ return NULL;
+ return page;
+}
/**
- * enough_free_mem - Make sure we enough free memory to snapshot.
- *
- * Returns TRUE or FALSE after checking the number of available
- * free pages.
+ * count_highmem_pages - compute the total number of saveable highmem
+ * pages.
*/
-static int enough_free_mem(unsigned int nr_pages)
+unsigned int count_highmem_pages(void)
{
struct zone *zone;
unsigned int n = 0;
- for_each_zone (zone)
+ for_each_zone(zone) {
+ unsigned long pfn, max_zone_pfn;
+
if (!is_highmem(zone))
- n += zone->free_pages;
- pr_debug("swsusp: available memory: %u pages\n", n);
- return n > (nr_pages + PAGES_FOR_IO +
- (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
+ continue;
+
+ mark_free_pages(zone);
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ if (saveable_highmem_page(pfn))
+ n++;
+ }
+ return n;
}
+#else
+static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
+static inline unsigned int count_highmem_pages(void) { return 0; }
+#endif /* CONFIG_HIGHMEM */
-int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed)
-{
- struct pbe *p;
+/**
+ * pfn_is_nosave - check if given pfn is in the 'nosave' section
+ */
- for_each_pbe (p, pblist) {
- p->address = (unsigned long)alloc_image_page(gfp_mask, safe_needed);
- if (!p->address)
- return -ENOMEM;
- }
- return 0;
+static inline int pfn_is_nosave(unsigned long pfn)
+{
+ unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
+ unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
+ return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
}
-static struct pbe *swsusp_alloc(unsigned int nr_pages)
+/**
+ * saveable - Determine whether a non-highmem page should be included in
+ * the suspend image.
+ *
+ * We should save the page if it isn't Nosave, and is not in the range
+ * of pages statically defined as 'unsaveable', and it isn't a part of
+ * a free chunk of pages.
+ */
+
+static struct page *saveable_page(unsigned long pfn)
{
- struct pbe *pblist;
+ struct page *page;
- if (!(pblist = alloc_pagedir(nr_pages, GFP_ATOMIC | __GFP_COLD, 0))) {
- printk(KERN_ERR "suspend: Allocating pagedir failed.\n");
+ if (!pfn_valid(pfn))
return NULL;
- }
- if (alloc_data_pages(pblist, GFP_ATOMIC | __GFP_COLD, 0)) {
- printk(KERN_ERR "suspend: Allocating image pages failed.\n");
- swsusp_free();
+ page = pfn_to_page(pfn);
+
+ BUG_ON(PageHighMem(page));
+
+ if (PageNosave(page) || PageNosaveFree(page))
+ return NULL;
+
+ if (PageReserved(page) && pfn_is_nosave(pfn))
return NULL;
- }
- return pblist;
+ return page;
}
-asmlinkage int swsusp_save(void)
+/**
+ * count_data_pages - compute the total number of saveable non-highmem
+ * pages.
+ */
+
+unsigned int count_data_pages(void)
{
- unsigned int nr_pages;
+ struct zone *zone;
+ unsigned long pfn, max_zone_pfn;
+ unsigned int n = 0;
- pr_debug("swsusp: critical section: \n");
+ for_each_zone(zone) {
+ if (is_highmem(zone))
+ continue;
- drain_local_pages();
- nr_pages = count_data_pages();
- printk("swsusp: Need to copy %u pages\n", nr_pages);
+ mark_free_pages(zone);
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ if(saveable_page(pfn))
+ n++;
+ }
+ return n;
+}
- pr_debug("swsusp: pages needed: %u + %lu + %u, free: %u\n",
- nr_pages,
- (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE,
- PAGES_FOR_IO, nr_free_pages());
+/* This is needed, because copy_page and memcpy are not usable for copying
+ * task structs.
+ */
+static inline void do_copy_page(long *dst, long *src)
+{
+ int n;
- if (!enough_free_mem(nr_pages)) {
- printk(KERN_ERR "swsusp: Not enough free memory\n");
- return -ENOMEM;
- }
+ for (n = PAGE_SIZE / sizeof(long); n; n--)
+ *dst++ = *src++;
+}
- pagedir_nosave = swsusp_alloc(nr_pages);
- if (!pagedir_nosave)
- return -ENOMEM;
+#ifdef CONFIG_HIGHMEM
+static inline struct page *
+page_is_saveable(struct zone *zone, unsigned long pfn)
+{
+ return is_highmem(zone) ?
+ saveable_highmem_page(pfn) : saveable_page(pfn);
+}
+
+static inline void
+copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
+{
+ struct page *s_page, *d_page;
+ void *src, *dst;
+
+ s_page = pfn_to_page(src_pfn);
+ d_page = pfn_to_page(dst_pfn);
+ if (PageHighMem(s_page)) {
+ src = kmap_atomic(s_page, KM_USER0);
+ dst = kmap_atomic(d_page, KM_USER1);
+ do_copy_page(dst, src);
+ kunmap_atomic(src, KM_USER0);
+ kunmap_atomic(dst, KM_USER1);
+ } else {
+ src = page_address(s_page);
+ if (PageHighMem(d_page)) {
+ /* Page pointed to by src may contain some kernel
+ * data modified by kmap_atomic()
+ */
+ do_copy_page(buffer, src);
+ dst = kmap_atomic(pfn_to_page(dst_pfn), KM_USER0);
+ memcpy(dst, buffer, PAGE_SIZE);
+ kunmap_atomic(dst, KM_USER0);
+ } else {
+ dst = page_address(d_page);
+ do_copy_page(dst, src);
+ }
+ }
+}
+#else
+#define page_is_saveable(zone, pfn) saveable_page(pfn)
+
+static inline void
+copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
+{
+ do_copy_page(page_address(pfn_to_page(dst_pfn)),
+ page_address(pfn_to_page(src_pfn)));
+}
+#endif /* CONFIG_HIGHMEM */
+
+static void
+copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm)
+{
+ struct zone *zone;
+ unsigned long pfn;
+
+ for_each_zone(zone) {
+ unsigned long max_zone_pfn;
+
+ mark_free_pages(zone);
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ if (page_is_saveable(zone, pfn))
+ memory_bm_set_bit(orig_bm, pfn);
+ }
+ memory_bm_position_reset(orig_bm);
+ memory_bm_position_reset(copy_bm);
+ do {
+ pfn = memory_bm_next_pfn(orig_bm);
+ if (likely(pfn != BM_END_OF_MAP))
+ copy_data_page(memory_bm_next_pfn(copy_bm), pfn);
+ } while (pfn != BM_END_OF_MAP);
+}
+
+/* Total number of image pages */
+static unsigned int nr_copy_pages;
+/* Number of pages needed for saving the original pfns of the image pages */
+static unsigned int nr_meta_pages;
+
+/**
+ * swsusp_free - free pages allocated for the suspend.
+ *
+ * Suspend pages are alocated before the atomic copy is made, so we
+ * need to release them after the resume.
+ */
+
+void swsusp_free(void)
+{
+ struct zone *zone;
+ unsigned long pfn, max_zone_pfn;
+
+ for_each_zone(zone) {
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ if (pfn_valid(pfn)) {
+ struct page *page = pfn_to_page(pfn);
+
+ if (PageNosave(page) && PageNosaveFree(page)) {
+ ClearPageNosave(page);
+ ClearPageNosaveFree(page);
+ __free_page(page);
+ }
+ }
+ }
+ nr_copy_pages = 0;
+ nr_meta_pages = 0;
+ restore_pblist = NULL;
+ buffer = NULL;
+}
+
+#ifdef CONFIG_HIGHMEM
+/**
+ * count_pages_for_highmem - compute the number of non-highmem pages
+ * that will be necessary for creating copies of highmem pages.
+ */
+
+static unsigned int count_pages_for_highmem(unsigned int nr_highmem)
+{
+ unsigned int free_highmem = count_free_highmem_pages();
+
+ if (free_highmem >= nr_highmem)
+ nr_highmem = 0;
+ else
+ nr_highmem -= free_highmem;
+
+ return nr_highmem;
+}
+#else
+static unsigned int
+count_pages_for_highmem(unsigned int nr_highmem) { return 0; }
+#endif /* CONFIG_HIGHMEM */
+
+/**
+ * enough_free_mem - Make sure we have enough free memory for the
+ * snapshot image.
+ */
+
+static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
+{
+ struct zone *zone;
+ unsigned int free = 0, meta = 0;
+
+ for_each_zone(zone) {
+ meta += snapshot_additional_pages(zone);
+ if (!is_highmem(zone))
+ free += zone->free_pages;
+ }
+
+ nr_pages += count_pages_for_highmem(nr_highmem);
+ pr_debug("swsusp: Normal pages needed: %u + %u + %u, available pages: %u\n",
+ nr_pages, PAGES_FOR_IO, meta, free);
+
+ return free > nr_pages + PAGES_FOR_IO + meta;
+}
+
+#ifdef CONFIG_HIGHMEM
+/**
+ * get_highmem_buffer - if there are some highmem pages in the suspend
+ * image, we may need the buffer to copy them and/or load their data.
+ */
+
+static inline int get_highmem_buffer(int safe_needed)
+{
+ buffer = get_image_page(GFP_ATOMIC | __GFP_COLD, safe_needed);
+ return buffer ? 0 : -ENOMEM;
+}
+
+/**
+ * alloc_highmem_image_pages - allocate some highmem pages for the image.
+ * Try to allocate as many pages as needed, but if the number of free
+ * highmem pages is lesser than that, allocate them all.
+ */
+
+static inline unsigned int
+alloc_highmem_image_pages(struct memory_bitmap *bm, unsigned int nr_highmem)
+{
+ unsigned int to_alloc = count_free_highmem_pages();
+
+ if (to_alloc > nr_highmem)
+ to_alloc = nr_highmem;
+
+ nr_highmem -= to_alloc;
+ while (to_alloc-- > 0) {
+ struct page *page;
+
+ page = alloc_image_page(__GFP_HIGHMEM);
+ memory_bm_set_bit(bm, page_to_pfn(page));
+ }
+ return nr_highmem;
+}
+#else
+static inline int get_highmem_buffer(int safe_needed) { return 0; }
+
+static inline unsigned int
+alloc_highmem_image_pages(struct memory_bitmap *bm, unsigned int n) { return 0; }
+#endif /* CONFIG_HIGHMEM */
+
+/**
+ * swsusp_alloc - allocate memory for the suspend image
+ *
+ * We first try to allocate as many highmem pages as there are
+ * saveable highmem pages in the system. If that fails, we allocate
+ * non-highmem pages for the copies of the remaining highmem ones.
+ *
+ * In this approach it is likely that the copies of highmem pages will
+ * also be located in the high memory, because of the way in which
+ * copy_data_pages() works.
+ */
+
+static int
+swsusp_alloc(struct memory_bitmap *orig_bm, struct memory_bitmap *copy_bm,
+ unsigned int nr_pages, unsigned int nr_highmem)
+{
+ int error;
+
+ error = memory_bm_create(orig_bm, GFP_ATOMIC | __GFP_COLD, PG_ANY);
+ if (error)
+ goto Free;
+
+ error = memory_bm_create(copy_bm, GFP_ATOMIC | __GFP_COLD, PG_ANY);
+ if (error)
+ goto Free;
+
+ if (nr_highmem > 0) {
+ error = get_highmem_buffer(PG_ANY);
+ if (error)
+ goto Free;
+
+ nr_pages += alloc_highmem_image_pages(copy_bm, nr_highmem);
+ }
+ while (nr_pages-- > 0) {
+ struct page *page = alloc_image_page(GFP_ATOMIC | __GFP_COLD);
+
+ if (!page)
+ goto Free;
+
+ memory_bm_set_bit(copy_bm, page_to_pfn(page));
+ }
+ return 0;
+
+ Free:
+ swsusp_free();
+ return -ENOMEM;
+}
+
+/* Memory bitmap used for marking saveable pages (during suspend) or the
+ * suspend image pages (during resume)
+ */
+static struct memory_bitmap orig_bm;
+/* Memory bitmap used on suspend for marking allocated pages that will contain
+ * the copies of saveable pages. During resume it is initially used for
+ * marking the suspend image pages, but then its set bits are duplicated in
+ * @orig_bm and it is released. Next, on systems with high memory, it may be
+ * used for marking "safe" highmem pages, but it has to be reinitialized for
+ * this purpose.
+ */
+static struct memory_bitmap copy_bm;
+
+asmlinkage int swsusp_save(void)
+{
+ unsigned int nr_pages, nr_highmem;
+
+ printk("swsusp: critical section: \n");
+
+ drain_local_pages();
+ nr_pages = count_data_pages();
+ nr_highmem = count_highmem_pages();
+ printk("swsusp: Need to copy %u pages\n", nr_pages + nr_highmem);
+
+ if (!enough_free_mem(nr_pages, nr_highmem)) {
+ printk(KERN_ERR "swsusp: Not enough free memory\n");
+ return -ENOMEM;
+ }
+
+ if (swsusp_alloc(&orig_bm, ©_bm, nr_pages, nr_highmem)) {
+ printk(KERN_ERR "swsusp: Memory allocation failed\n");
+ return -ENOMEM;
+ }
/* During allocating of suspend pagedir, new cold pages may appear.
* Kill them.
*/
drain_local_pages();
- copy_data_pages(pagedir_nosave);
+ copy_data_pages(©_bm, &orig_bm);
/*
* End of critical section. From now on, we can write to memory,
* touch swap space! Except we must write out our image of course.
*/
+ nr_pages += nr_highmem;
nr_copy_pages = nr_pages;
+ nr_meta_pages = DIV_ROUND_UP(nr_pages * sizeof(long), PAGE_SIZE);
printk("swsusp: critical section/: done (%d pages copied)\n", nr_pages);
+
+ return 0;
+}
+
+static void init_header(struct swsusp_info *info)
+{
+ memset(info, 0, sizeof(struct swsusp_info));
+ info->version_code = LINUX_VERSION_CODE;
+ info->num_physpages = num_physpages;
+ memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname));
+ info->cpus = num_online_cpus();
+ info->image_pages = nr_copy_pages;
+ info->pages = nr_copy_pages + nr_meta_pages + 1;
+ info->size = info->pages;
+ info->size <<= PAGE_SHIFT;
+}
+
+/**
+ * pack_pfns - pfns corresponding to the set bits found in the bitmap @bm
+ * are stored in the array @buf[] (1 page at a time)
+ */
+
+static inline void
+pack_pfns(unsigned long *buf, struct memory_bitmap *bm)
+{
+ int j;
+
+ for (j = 0; j < PAGE_SIZE / sizeof(long); j++) {
+ buf[j] = memory_bm_next_pfn(bm);
+ if (unlikely(buf[j] == BM_END_OF_MAP))
+ break;
+ }
+}
+
+/**
+ * snapshot_read_next - used for reading the system memory snapshot.
+ *
+ * On the first call to it @handle should point to a zeroed
+ * snapshot_handle structure. The structure gets updated and a pointer
+ * to it should be passed to this function every next time.
+ *
+ * The @count parameter should contain the number of bytes the caller
+ * wants to read from the snapshot. It must not be zero.
+ *
+ * On success the function returns a positive number. Then, the caller
+ * is allowed to read up to the returned number of bytes from the memory
+ * location computed by the data_of() macro. The number returned
+ * may be smaller than @count, but this only happens if the read would
+ * cross a page boundary otherwise.
+ *
+ * The function returns 0 to indicate the end of data stream condition,
+ * and a negative number is returned on error. In such cases the
+ * structure pointed to by @handle is not updated and should not be used
+ * any more.
+ */
+
+int snapshot_read_next(struct snapshot_handle *handle, size_t count)
+{
+ if (handle->cur > nr_meta_pages + nr_copy_pages)
+ return 0;
+
+ if (!buffer) {
+ /* This makes the buffer be freed by swsusp_free() */
+ buffer = get_image_page(GFP_ATOMIC, PG_ANY);
+ if (!buffer)
+ return -ENOMEM;
+ }
+ if (!handle->offset) {
+ init_header((struct swsusp_info *)buffer);
+ handle->buffer = buffer;
+ memory_bm_position_reset(&orig_bm);
+ memory_bm_position_reset(©_bm);
+ }
+ if (handle->prev < handle->cur) {
+ if (handle->cur <= nr_meta_pages) {
+ memset(buffer, 0, PAGE_SIZE);
+ pack_pfns(buffer, &orig_bm);
+ } else {
+ struct page *page;
+
+ page = pfn_to_page(memory_bm_next_pfn(©_bm));
+ if (PageHighMem(page)) {
+ /* Highmem pages are copied to the buffer,
+ * because we can't return with a kmapped
+ * highmem page (we may not be called again).
+ */
+ void *kaddr;
+
+ kaddr = kmap_atomic(page, KM_USER0);
+ memcpy(buffer, kaddr, PAGE_SIZE);
+ kunmap_atomic(kaddr, KM_USER0);
+ handle->buffer = buffer;
+ } else {
+ handle->buffer = page_address(page);
+ }
+ }
+ handle->prev = handle->cur;
+ }
+ handle->buf_offset = handle->cur_offset;
+ if (handle->cur_offset + count >= PAGE_SIZE) {
+ count = PAGE_SIZE - handle->cur_offset;
+ handle->cur_offset = 0;
+ handle->cur++;
+ } else {
+ handle->cur_offset += count;
+ }
+ handle->offset += count;
+ return count;
+}
+
+/**
+ * mark_unsafe_pages - mark the pages that cannot be used for storing
+ * the image during resume, because they conflict with the pages that
+ * had been used before suspend
+ */
+
+static int mark_unsafe_pages(struct memory_bitmap *bm)
+{
+ struct zone *zone;
+ unsigned long pfn, max_zone_pfn;
+
+ /* Clear page flags */
+ for_each_zone(zone) {
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ if (pfn_valid(pfn))
+ ClearPageNosaveFree(pfn_to_page(pfn));
+ }
+
+ /* Mark pages that correspond to the "original" pfns as "unsafe" */
+ memory_bm_position_reset(bm);
+ do {
+ pfn = memory_bm_next_pfn(bm);
+ if (likely(pfn != BM_END_OF_MAP)) {
+ if (likely(pfn_valid(pfn)))
+ SetPageNosaveFree(pfn_to_page(pfn));
+ else
+ return -EFAULT;
+ }
+ } while (pfn != BM_END_OF_MAP);
+
+ allocated_unsafe_pages = 0;
+
+ return 0;
+}
+
+static void
+duplicate_memory_bitmap(struct memory_bitmap *dst, struct memory_bitmap *src)
+{
+ unsigned long pfn;
+
+ memory_bm_position_reset(src);
+ pfn = memory_bm_next_pfn(src);
+ while (pfn != BM_END_OF_MAP) {
+ memory_bm_set_bit(dst, pfn);
+ pfn = memory_bm_next_pfn(src);
+ }
+}
+
+static inline int check_header(struct swsusp_info *info)
+{
+ char *reason = NULL;
+
+ if (info->version_code != LINUX_VERSION_CODE)
+ reason = "kernel version";
+ if (info->num_physpages != num_physpages)
+ reason = "memory size";
+ if (strcmp(info->uts.sysname,init_utsname()->sysname))
+ reason = "system type";
+ if (strcmp(info->uts.release,init_utsname()->release))
+ reason = "kernel release";
+ if (strcmp(info->uts.version,init_utsname()->version))
+ reason = "version";
+ if (strcmp(info->uts.machine,init_utsname()->machine))
+ reason = "machine";
+ if (reason) {
+ printk(KERN_ERR "swsusp: Resume mismatch: %s\n", reason);
+ return -EPERM;
+ }
+ return 0;
+}
+
+/**
+ * load header - check the image header and copy data from it
+ */
+
+static int
+load_header(struct swsusp_info *info)
+{
+ int error;
+
+ restore_pblist = NULL;
+ error = check_header(info);
+ if (!error) {
+ nr_copy_pages = info->image_pages;
+ nr_meta_pages = info->pages - info->image_pages - 1;
+ }
+ return error;
+}
+
+/**
+ * unpack_orig_pfns - for each element of @buf[] (1 page at a time) set
+ * the corresponding bit in the memory bitmap @bm
+ */
+
+static inline void
+unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm)
+{
+ int j;
+
+ for (j = 0; j < PAGE_SIZE / sizeof(long); j++) {
+ if (unlikely(buf[j] == BM_END_OF_MAP))
+ break;
+
+ memory_bm_set_bit(bm, buf[j]);
+ }
+}
+
+/* List of "safe" pages that may be used to store data loaded from the suspend
+ * image
+ */
+static struct linked_page *safe_pages_list;
+
+#ifdef CONFIG_HIGHMEM
+/* struct highmem_pbe is used for creating the list of highmem pages that
+ * should be restored atomically during the resume from disk, because the page
+ * frames they have occupied before the suspend are in use.
+ */
+struct highmem_pbe {
+ struct page *copy_page; /* data is here now */
+ struct page *orig_page; /* data was here before the suspend */
+ struct highmem_pbe *next;
+};
+
+/* List of highmem PBEs needed for restoring the highmem pages that were
+ * allocated before the suspend and included in the suspend image, but have
+ * also been allocated by the "resume" kernel, so their contents cannot be
+ * written directly to their "original" page frames.
+ */
+static struct highmem_pbe *highmem_pblist;
+
+/**
+ * count_highmem_image_pages - compute the number of highmem pages in the
+ * suspend image. The bits in the memory bitmap @bm that correspond to the
+ * image pages are assumed to be set.
+ */
+
+static unsigned int count_highmem_image_pages(struct memory_bitmap *bm)
+{
+ unsigned long pfn;
+ unsigned int cnt = 0;
+
+ memory_bm_position_reset(bm);
+ pfn = memory_bm_next_pfn(bm);
+ while (pfn != BM_END_OF_MAP) {
+ if (PageHighMem(pfn_to_page(pfn)))
+ cnt++;
+
+ pfn = memory_bm_next_pfn(bm);
+ }
+ return cnt;
+}
+
+/**
+ * prepare_highmem_image - try to allocate as many highmem pages as
+ * there are highmem image pages (@nr_highmem_p points to the variable
+ * containing the number of highmem image pages). The pages that are
+ * "safe" (ie. will not be overwritten when the suspend image is
+ * restored) have the corresponding bits set in @bm (it must be
+ * unitialized).
+ *
+ * NOTE: This function should not be called if there are no highmem
+ * image pages.
+ */
+
+static unsigned int safe_highmem_pages;
+
+static struct memory_bitmap *safe_highmem_bm;
+
+static int
+prepare_highmem_image(struct memory_bitmap *bm, unsigned int *nr_highmem_p)
+{
+ unsigned int to_alloc;
+
+ if (memory_bm_create(bm, GFP_ATOMIC, PG_SAFE))
+ return -ENOMEM;
+
+ if (get_highmem_buffer(PG_SAFE))
+ return -ENOMEM;
+
+ to_alloc = count_free_highmem_pages();
+ if (to_alloc > *nr_highmem_p)
+ to_alloc = *nr_highmem_p;
+ else
+ *nr_highmem_p = to_alloc;
+
+ safe_highmem_pages = 0;
+ while (to_alloc-- > 0) {
+ struct page *page;
+
+ page = alloc_page(__GFP_HIGHMEM);
+ if (!PageNosaveFree(page)) {
+ /* The page is "safe", set its bit the bitmap */
+ memory_bm_set_bit(bm, page_to_pfn(page));
+ safe_highmem_pages++;
+ }
+ /* Mark the page as allocated */
+ SetPageNosave(page);
+ SetPageNosaveFree(page);
+ }
+ memory_bm_position_reset(bm);
+ safe_highmem_bm = bm;
+ return 0;
+}
+
+/**
+ * get_highmem_page_buffer - for given highmem image page find the buffer
+ * that suspend_write_next() should set for its caller to write to.
+ *
+ * If the page is to be saved to its "original" page frame or a copy of
+ * the page is to be made in the highmem, @buffer is returned. Otherwise,
+ * the copy of the page is to be made in normal memory, so the address of
+ * the copy is returned.
+ *
+ * If @buffer is returned, the caller of suspend_write_next() will write
+ * the page's contents to @buffer, so they will have to be copied to the
+ * right location on the next call to suspend_write_next() and it is done
+ * with the help of copy_last_highmem_page(). For this purpose, if
+ * @buffer is returned, @last_highmem page is set to the page to which
+ * the data will have to be copied from @buffer.
+ */
+
+static struct page *last_highmem_page;
+
+static void *
+get_highmem_page_buffer(struct page *page, struct chain_allocator *ca)
+{
+ struct highmem_pbe *pbe;
+ void *kaddr;
+
+ if (PageNosave(page) && PageNosaveFree(page)) {
+ /* We have allocated the "original" page frame and we can
+ * use it directly to store the loaded page.
+ */
+ last_highmem_page = page;
+ return buffer;
+ }
+ /* The "original" page frame has not been allocated and we have to
+ * use a "safe" page frame to store the loaded page.
+ */
+ pbe = chain_alloc(ca, sizeof(struct highmem_pbe));
+ if (!pbe) {
+ swsusp_free();
+ return NULL;
+ }
+ pbe->orig_page = page;
+ if (safe_highmem_pages > 0) {
+ struct page *tmp;
+
+ /* Copy of the page will be stored in high memory */
+ kaddr = buffer;
+ tmp = pfn_to_page(memory_bm_next_pfn(safe_highmem_bm));
+ safe_highmem_pages--;
+ last_highmem_page = tmp;
+ pbe->copy_page = tmp;
+ } else {
+ /* Copy of the page will be stored in normal memory */
+ kaddr = safe_pages_list;
+ safe_pages_list = safe_pages_list->next;
+ pbe->copy_page = virt_to_page(kaddr);
+ }
+ pbe->next = highmem_pblist;
+ highmem_pblist = pbe;
+ return kaddr;
+}
+
+/**
+ * copy_last_highmem_page - copy the contents of a highmem image from
+ * @buffer, where the caller of snapshot_write_next() has place them,
+ * to the right location represented by @last_highmem_page .
+ */
+
+static void copy_last_highmem_page(void)
+{
+ if (last_highmem_page) {
+ void *dst;
+
+ dst = kmap_atomic(last_highmem_page, KM_USER0);
+ memcpy(dst, buffer, PAGE_SIZE);
+ kunmap_atomic(dst, KM_USER0);
+ last_highmem_page = NULL;
+ }
+}
+
+static inline int last_highmem_page_copied(void)
+{
+ return !last_highmem_page;
+}
+
+static inline void free_highmem_data(void)
+{
+ if (safe_highmem_bm)
+ memory_bm_free(safe_highmem_bm, PG_UNSAFE_CLEAR);
+
+ if (buffer)
+ free_image_page(buffer, PG_UNSAFE_CLEAR);
+}
+#else
+static inline int get_safe_write_buffer(void) { return 0; }
+
+static unsigned int
+count_highmem_image_pages(struct memory_bitmap *bm) { return 0; }
+
+static inline int
+prepare_highmem_image(struct memory_bitmap *bm, unsigned int *nr_highmem_p)
+{
+ return 0;
+}
+
+static inline void *
+get_highmem_page_buffer(struct page *page, struct chain_allocator *ca)
+{
+ return NULL;
+}
+
+static inline void copy_last_highmem_page(void) {}
+static inline int last_highmem_page_copied(void) { return 1; }
+static inline void free_highmem_data(void) {}
+#endif /* CONFIG_HIGHMEM */
+
+/**
+ * prepare_image - use the memory bitmap @bm to mark the pages that will
+ * be overwritten in the process of restoring the system memory state
+ * from the suspend image ("unsafe" pages) and allocate memory for the
+ * image.
+ *
+ * The idea is to allocate a new memory bitmap first and then allocate
+ * as many pages as needed for the image data, but not to assign these
+ * pages to specific tasks initially. Instead, we just mark them as
+ * allocated and create a lists of "safe" pages that will be used
+ * later. On systems with high memory a list of "safe" highmem pages is
+ * also created.
+ */
+
+#define PBES_PER_LINKED_PAGE (LINKED_PAGE_DATA_SIZE / sizeof(struct pbe))
+
+static int
+prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm)
+{
+ unsigned int nr_pages, nr_highmem;
+ struct linked_page *sp_list, *lp;
+ int error;
+
+ /* If there is no highmem, the buffer will not be necessary */
+ free_image_page(buffer, PG_UNSAFE_CLEAR);
+ buffer = NULL;
+
+ nr_highmem = count_highmem_image_pages(bm);
+ error = mark_unsafe_pages(bm);
+ if (error)
+ goto Free;
+
+ error = memory_bm_create(new_bm, GFP_ATOMIC, PG_SAFE);
+ if (error)
+ goto Free;
+
+ duplicate_memory_bitmap(new_bm, bm);
+ memory_bm_free(bm, PG_UNSAFE_KEEP);
+ if (nr_highmem > 0) {
+ error = prepare_highmem_image(bm, &nr_highmem);
+ if (error)
+ goto Free;
+ }
+ /* Reserve some safe pages for potential later use.
+ *
+ * NOTE: This way we make sure there will be enough safe pages for the
+ * chain_alloc() in get_buffer(). It is a bit wasteful, but
+ * nr_copy_pages cannot be greater than 50% of the memory anyway.
+ */
+ sp_list = NULL;
+ /* nr_copy_pages cannot be lesser than allocated_unsafe_pages */
+ nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages;
+ nr_pages = DIV_ROUND_UP(nr_pages, PBES_PER_LINKED_PAGE);
+ while (nr_pages > 0) {
+ lp = get_image_page(GFP_ATOMIC, PG_SAFE);
+ if (!lp) {
+ error = -ENOMEM;
+ goto Free;
+ }
+ lp->next = sp_list;
+ sp_list = lp;
+ nr_pages--;
+ }
+ /* Preallocate memory for the image */
+ safe_pages_list = NULL;
+ nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages;
+ while (nr_pages > 0) {
+ lp = (struct linked_page *)get_zeroed_page(GFP_ATOMIC);
+ if (!lp) {
+ error = -ENOMEM;
+ goto Free;
+ }
+ if (!PageNosaveFree(virt_to_page(lp))) {
+ /* The page is "safe", add it to the list */
+ lp->next = safe_pages_list;
+ safe_pages_list = lp;
+ }
+ /* Mark the page as allocated */
+ SetPageNosave(virt_to_page(lp));
+ SetPageNosaveFree(virt_to_page(lp));
+ nr_pages--;
+ }
+ /* Free the reserved safe pages so that chain_alloc() can use them */
+ while (sp_list) {
+ lp = sp_list->next;
+ free_image_page(sp_list, PG_UNSAFE_CLEAR);
+ sp_list = lp;
+ }
+ return 0;
+
+ Free:
+ swsusp_free();
+ return error;
+}
+
+/**
+ * get_buffer - compute the address that snapshot_write_next() should
+ * set for its caller to write to.
+ */
+
+static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca)
+{
+ struct pbe *pbe;
+ struct page *page = pfn_to_page(memory_bm_next_pfn(bm));
+
+ if (PageHighMem(page))
+ return get_highmem_page_buffer(page, ca);
+
+ if (PageNosave(page) && PageNosaveFree(page))
+ /* We have allocated the "original" page frame and we can
+ * use it directly to store the loaded page.
+ */
+ return page_address(page);
+
+ /* The "original" page frame has not been allocated and we have to
+ * use a "safe" page frame to store the loaded page.
+ */
+ pbe = chain_alloc(ca, sizeof(struct pbe));
+ if (!pbe) {
+ swsusp_free();
+ return NULL;
+ }
+ pbe->orig_address = page_address(page);
+ pbe->address = safe_pages_list;
+ safe_pages_list = safe_pages_list->next;
+ pbe->next = restore_pblist;
+ restore_pblist = pbe;
+ return pbe->address;
+}
+
+/**
+ * snapshot_write_next - used for writing the system memory snapshot.
+ *
+ * On the first call to it @handle should point to a zeroed
+ * snapshot_handle structure. The structure gets updated and a pointer
+ * to it should be passed to this function every next time.
+ *
+ * The @count parameter should contain the number of bytes the caller
+ * wants to write to the image. It must not be zero.
+ *
+ * On success the function returns a positive number. Then, the caller
+ * is allowed to write up to the returned number of bytes to the memory
+ * location computed by the data_of() macro. The number returned
+ * may be smaller than @count, but this only happens if the write would
+ * cross a page boundary otherwise.
+ *
+ * The function returns 0 to indicate the "end of file" condition,
+ * and a negative number is returned on error. In such cases the
+ * structure pointed to by @handle is not updated and should not be used
+ * any more.
+ */
+
+int snapshot_write_next(struct snapshot_handle *handle, size_t count)
+{
+ static struct chain_allocator ca;
+ int error = 0;
+
+ /* Check if we have already loaded the entire image */
+ if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages)
+ return 0;
+
+ if (handle->offset == 0) {
+ if (!buffer)
+ /* This makes the buffer be freed by swsusp_free() */
+ buffer = get_image_page(GFP_ATOMIC, PG_ANY);
+
+ if (!buffer)
+ return -ENOMEM;
+
+ handle->buffer = buffer;
+ }
+ handle->sync_read = 1;
+ if (handle->prev < handle->cur) {
+ if (handle->prev == 0) {
+ error = load_header(buffer);
+ if (error)
+ return error;
+
+ error = memory_bm_create(©_bm, GFP_ATOMIC, PG_ANY);
+ if (error)
+ return error;
+
+ } else if (handle->prev <= nr_meta_pages) {
+ unpack_orig_pfns(buffer, ©_bm);
+ if (handle->prev == nr_meta_pages) {
+ error = prepare_image(&orig_bm, ©_bm);
+ if (error)
+ return error;
+
+ chain_init(&ca, GFP_ATOMIC, PG_SAFE);
+ memory_bm_position_reset(&orig_bm);
+ restore_pblist = NULL;
+ handle->buffer = get_buffer(&orig_bm, &ca);
+ handle->sync_read = 0;
+ if (!handle->buffer)
+ return -ENOMEM;
+ }
+ } else {
+ copy_last_highmem_page();
+ handle->buffer = get_buffer(&orig_bm, &ca);
+ if (handle->buffer != buffer)
+ handle->sync_read = 0;
+ }
+ handle->prev = handle->cur;
+ }
+ handle->buf_offset = handle->cur_offset;
+ if (handle->cur_offset + count >= PAGE_SIZE) {
+ count = PAGE_SIZE - handle->cur_offset;
+ handle->cur_offset = 0;
+ handle->cur++;
+ } else {
+ handle->cur_offset += count;
+ }
+ handle->offset += count;
+ return count;
+}
+
+/**
+ * snapshot_write_finalize - must be called after the last call to
+ * snapshot_write_next() in case the last page in the image happens
+ * to be a highmem page and its contents should be stored in the
+ * highmem. Additionally, it releases the memory that will not be
+ * used any more.
+ */
+
+void snapshot_write_finalize(struct snapshot_handle *handle)
+{
+ copy_last_highmem_page();
+ /* Free only if we have loaded the image entirely */
+ if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages) {
+ memory_bm_free(&orig_bm, PG_UNSAFE_CLEAR);
+ free_highmem_data();
+ }
+}
+
+int snapshot_image_loaded(struct snapshot_handle *handle)
+{
+ return !(!nr_copy_pages || !last_highmem_page_copied() ||
+ handle->cur <= nr_meta_pages + nr_copy_pages);
+}
+
+#ifdef CONFIG_HIGHMEM
+/* Assumes that @buf is ready and points to a "safe" page */
+static inline void
+swap_two_pages_data(struct page *p1, struct page *p2, void *buf)
+{
+ void *kaddr1, *kaddr2;
+
+ kaddr1 = kmap_atomic(p1, KM_USER0);
+ kaddr2 = kmap_atomic(p2, KM_USER1);
+ memcpy(buf, kaddr1, PAGE_SIZE);
+ memcpy(kaddr1, kaddr2, PAGE_SIZE);
+ memcpy(kaddr2, buf, PAGE_SIZE);
+ kunmap_atomic(kaddr1, KM_USER0);
+ kunmap_atomic(kaddr2, KM_USER1);
+}
+
+/**
+ * restore_highmem - for each highmem page that was allocated before
+ * the suspend and included in the suspend image, and also has been
+ * allocated by the "resume" kernel swap its current (ie. "before
+ * resume") contents with the previous (ie. "before suspend") one.
+ *
+ * If the resume eventually fails, we can call this function once
+ * again and restore the "before resume" highmem state.
+ */
+
+int restore_highmem(void)
+{
+ struct highmem_pbe *pbe = highmem_pblist;
+ void *buf;
+
+ if (!pbe)
+ return 0;
+
+ buf = get_image_page(GFP_ATOMIC, PG_SAFE);
+ if (!buf)
+ return -ENOMEM;
+
+ while (pbe) {
+ swap_two_pages_data(pbe->copy_page, pbe->orig_page, buf);
+ pbe = pbe->next;
+ }
+ free_image_page(buf, PG_UNSAFE_CLEAR);
return 0;
}
+#endif /* CONFIG_HIGHMEM */
git://git.onelab.eu / linux-2.6.git / blobdiff