*/
struct pbe *restore_pblist;
+/* 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];
+} __packed;
+
+/*
+ * List of "safe" pages (ie. pages that were not used by the image kernel
+ * before hibernation) that may be used as temporary storage for image kernel
+ * memory contents.
+ */
+static struct linked_page *safe_pages_list;
+
/* Pointer to an auxiliary buffer (1 page) */
static void *buffer;
return res;
}
+static void *__get_safe_page(gfp_t gfp_mask)
+{
+ if (safe_pages_list) {
+ void *ret = safe_pages_list;
+
+ safe_pages_list = safe_pages_list->next;
+ memset(ret, 0, PAGE_SIZE);
+ return ret;
+ }
+ return get_image_page(gfp_mask, PG_SAFE);
+}
+
unsigned long get_safe_page(gfp_t gfp_mask)
{
- return (unsigned long)get_image_page(gfp_mask, PG_SAFE);
+ return (unsigned long)__get_safe_page(gfp_mask);
}
static struct page *alloc_image_page(gfp_t gfp_mask)
return page;
}
+static void recycle_safe_page(void *page_address)
+{
+ struct linked_page *lp = page_address;
+
+ lp->next = safe_pages_list;
+ safe_pages_list = lp;
+}
+
/**
* free_image_page - free page represented by @addr, allocated with
* get_image_page (page flags set by it must be cleared)
__free_page(page);
}
-/* 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];
-} __packed;
-
-static inline void
-free_list_of_pages(struct linked_page *list, int clear_page_nosave)
+static inline void free_list_of_pages(struct linked_page *list,
+ int clear_page_nosave)
{
while (list) {
struct linked_page *lp = list->next;
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)
+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;
if (LINKED_PAGE_DATA_SIZE - ca->used_space < size) {
struct linked_page *lp;
- lp = get_image_page(ca->gfp_mask, ca->safe_needed);
+ lp = ca->safe_needed ? __get_safe_page(ca->gfp_mask) :
+ get_image_page(ca->gfp_mask, PG_ANY);
if (!lp)
return NULL;
* This function also allocated and builds the radix tree for the
* zone.
*/
-static struct mem_zone_bm_rtree *
-create_zone_bm_rtree(gfp_t gfp_mask, int safe_needed,
- struct chain_allocator *ca,
- unsigned long start, unsigned long end)
+static struct mem_zone_bm_rtree *create_zone_bm_rtree(gfp_t gfp_mask,
+ int safe_needed,
+ struct chain_allocator *ca,
+ unsigned long start,
+ unsigned long end)
{
struct mem_zone_bm_rtree *zone;
unsigned int i, nr_blocks;
/**
* memory_bm_create - allocate memory for a memory bitmap
*/
-static int
-memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask, int safe_needed)
+static int memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask,
+ int safe_needed)
{
struct chain_allocator ca;
struct list_head mem_extents;
static LIST_HEAD(nosave_regions);
+static void recycle_zone_bm_rtree(struct mem_zone_bm_rtree *zone)
+{
+ struct rtree_node *node;
+
+ list_for_each_entry(node, &zone->nodes, list)
+ recycle_safe_page(node->data);
+
+ list_for_each_entry(node, &zone->leaves, list)
+ recycle_safe_page(node->data);
+}
+
+static void memory_bm_recycle(struct memory_bitmap *bm)
+{
+ struct mem_zone_bm_rtree *zone;
+ struct linked_page *p_list;
+
+ list_for_each_entry(zone, &bm->zones, list)
+ recycle_zone_bm_rtree(zone);
+
+ p_list = bm->p_list;
+ while (p_list) {
+ struct linked_page *lp = p_list;
+
+ p_list = lp->next;
+ recycle_safe_page(lp);
+ }
+}
+
/**
* register_nosave_region - register a range of page frames the contents
* of which should not be saved during the suspend (to be used in the early
* initialization code)
*/
-void __init
-__register_nosave_region(unsigned long start_pfn, unsigned long end_pfn,
- int use_kmalloc)
+void __init __register_nosave_region(unsigned long start_pfn,
+ unsigned long end_pfn, int use_kmalloc)
{
struct nosave_region *region;
#ifdef CONFIG_HIGHMEM
-static inline struct page *
-page_is_saveable(struct zone *zone, unsigned long pfn)
+static inline struct page *page_is_saveable(struct zone *zone, unsigned long pfn)
{
return is_highmem(zone) ?
saveable_highmem_page(zone, pfn) : saveable_page(zone, pfn);
}
#endif /* CONFIG_HIGHMEM */
-static void
-copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm)
+static void copy_data_pages(struct memory_bitmap *copy_bm,
+ struct memory_bitmap *orig_bm)
{
struct zone *zone;
unsigned long pfn;
}
static unsigned long preallocate_highmem_fraction(unsigned long nr_pages,
- unsigned long highmem,
- unsigned long total)
+ unsigned long highmem,
+ unsigned long total)
{
unsigned long alloc = __fraction(nr_pages, highmem, total);
}
static inline unsigned long preallocate_highmem_fraction(unsigned long nr_pages,
- unsigned long highmem,
- unsigned long total)
+ unsigned long highmem,
+ unsigned long total)
{
return 0;
}
return nr_highmem;
}
#else
-static unsigned int
-count_pages_for_highmem(unsigned int nr_highmem) { return 0; }
+static unsigned int count_pages_for_highmem(unsigned int nr_highmem) { return 0; }
#endif /* CONFIG_HIGHMEM */
/**
* highmem pages is lesser than that, allocate them all.
*/
-static inline unsigned int
-alloc_highmem_pages(struct memory_bitmap *bm, unsigned int nr_highmem)
+static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm,
+ unsigned int nr_highmem)
{
unsigned int to_alloc = count_free_highmem_pages();
#else
static inline int get_highmem_buffer(int safe_needed) { return 0; }
-static inline unsigned int
-alloc_highmem_pages(struct memory_bitmap *bm, unsigned int n) { return 0; }
+static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm,
+ unsigned int n) { return 0; }
#endif /* CONFIG_HIGHMEM */
/**
* 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)
+static int swsusp_alloc(struct memory_bitmap *orig_bm,
+ struct memory_bitmap *copy_bm,
+ unsigned int nr_pages, unsigned int nr_highmem)
{
if (nr_highmem > 0) {
if (get_highmem_buffer(PG_ANY))
* are stored in the array @buf[] (1 page at a time)
*/
-static inline void
-pack_pfns(unsigned long *buf, struct memory_bitmap *bm)
+static inline void pack_pfns(unsigned long *buf, struct memory_bitmap *bm)
{
int j;
return PAGE_SIZE;
}
+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);
+ }
+}
+
/**
* 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)
+static void mark_unsafe_pages(struct memory_bitmap *bm)
{
- struct zone *zone;
- unsigned long pfn, max_zone_pfn;
+ unsigned long pfn;
- /* Clear page flags */
- for_each_populated_zone(zone) {
- max_zone_pfn = zone_end_pfn(zone);
- for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
- if (pfn_valid(pfn))
- swsusp_unset_page_free(pfn_to_page(pfn));
+ /* Clear the "free"/"unsafe" bit for all PFNs */
+ memory_bm_position_reset(free_pages_map);
+ pfn = memory_bm_next_pfn(free_pages_map);
+ while (pfn != BM_END_OF_MAP) {
+ memory_bm_clear_current(free_pages_map);
+ pfn = memory_bm_next_pfn(free_pages_map);
}
- /* 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)))
- swsusp_set_page_free(pfn_to_page(pfn));
- else
- return -EFAULT;
- }
- } while (pfn != BM_END_OF_MAP);
+ /* Mark pages that correspond to the "original" PFNs as "unsafe" */
+ duplicate_memory_bitmap(free_pages_map, bm);
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 int check_header(struct swsusp_info *info)
* load header - check the image header and copy data from it
*/
-static int
-load_header(struct swsusp_info *info)
+static int load_header(struct swsusp_info *info)
{
int error;
/* Extract and buffer page key for data page (s390 only). */
page_key_memorize(buf + j);
- if (memory_bm_pfn_present(bm, buf[j]))
+ if (pfn_valid(buf[j]) && memory_bm_pfn_present(bm, buf[j]))
memory_bm_set_bit(bm, buf[j]);
else
return -EFAULT;
return 0;
}
-/* 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
static struct memory_bitmap *safe_highmem_bm;
-static int
-prepare_highmem_image(struct memory_bitmap *bm, unsigned int *nr_highmem_p)
+static int prepare_highmem_image(struct memory_bitmap *bm,
+ unsigned int *nr_highmem_p)
{
unsigned int to_alloc;
static struct page *last_highmem_page;
-static void *
-get_highmem_page_buffer(struct page *page, struct chain_allocator *ca)
+static void *get_highmem_page_buffer(struct page *page,
+ struct chain_allocator *ca)
{
struct highmem_pbe *pbe;
void *kaddr;
free_image_page(buffer, PG_UNSAFE_CLEAR);
}
#else
-static unsigned int
-count_highmem_image_pages(struct memory_bitmap *bm) { 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 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)
+static inline void *get_highmem_page_buffer(struct page *page,
+ struct chain_allocator *ca)
{
return ERR_PTR(-EINVAL);
}
#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)
+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;
+ struct linked_page *lp;
int error;
/* If there is no highmem, the buffer will not be necessary */
buffer = NULL;
nr_highmem = count_highmem_image_pages(bm);
- error = mark_unsafe_pages(bm);
- if (error)
- goto Free;
+ mark_unsafe_pages(bm);
error = memory_bm_create(new_bm, GFP_ATOMIC, PG_SAFE);
if (error)
* 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.
+ *
+ * nr_copy_pages cannot be less than allocated_unsafe_pages too.
*/
- 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) {
error = -ENOMEM;
goto Free;
}
- lp->next = sp_list;
- sp_list = lp;
+ lp->next = safe_pages_list;
+ safe_pages_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);
swsusp_set_page_free(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:
if (error)
return error;
+ safe_pages_list = NULL;
+
error = memory_bm_create(©_bm, GFP_ATOMIC, PG_ANY);
if (error)
return error;
/* Restore page key for data page (s390 only). */
page_key_write(handle->buffer);
page_key_free();
- /* Free only if we have loaded the image entirely */
+ /* Do that only if we have loaded the image entirely */
if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) {
- memory_bm_free(&orig_bm, PG_UNSAFE_CLEAR);
+ memory_bm_recycle(&orig_bm);
free_highmem_data();
}
}
#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)
+static inline void swap_two_pages_data(struct page *p1, struct page *p2,
+ void *buf)
{
void *kaddr1, *kaddr2;
projects / cascardo / linux.git / blobdiff