static unsigned int nr_meta_pages;
static unsigned long *buffer;
-struct arch_saveable_page {
- unsigned long start;
- unsigned long end;
- char *data;
- struct arch_saveable_page *next;
-};
-static struct arch_saveable_page *arch_pages;
-
-int swsusp_add_arch_pages(unsigned long start, unsigned long end)
-{
- struct arch_saveable_page *tmp;
-
- while (start < end) {
- tmp = kzalloc(sizeof(struct arch_saveable_page), GFP_KERNEL);
- if (!tmp)
- return -ENOMEM;
- tmp->start = start;
- tmp->end = ((start >> PAGE_SHIFT) + 1) << PAGE_SHIFT;
- if (tmp->end > end)
- tmp->end = end;
- tmp->next = arch_pages;
- start = tmp->end;
- arch_pages = tmp;
- }
- return 0;
-}
-
-static unsigned int count_arch_pages(void)
-{
- unsigned int count = 0;
- struct arch_saveable_page *tmp = arch_pages;
- while (tmp) {
- count++;
- tmp = tmp->next;
- }
- return count;
-}
-
-static int save_arch_mem(void)
-{
- char *kaddr;
- struct arch_saveable_page *tmp = arch_pages;
- int offset;
-
- pr_debug("swsusp: Saving arch specific memory");
- while (tmp) {
- tmp->data = (char *)__get_free_page(GFP_ATOMIC);
- if (!tmp->data)
- return -ENOMEM;
- offset = tmp->start - (tmp->start & PAGE_MASK);
- /* arch pages might haven't a 'struct page' */
- kaddr = kmap_atomic_pfn(tmp->start >> PAGE_SHIFT, KM_USER0);
- memcpy(tmp->data + offset, kaddr + offset,
- tmp->end - tmp->start);
- kunmap_atomic(kaddr, KM_USER0);
-
- tmp = tmp->next;
- }
- return 0;
-}
-
-static int restore_arch_mem(void)
-{
- char *kaddr;
- struct arch_saveable_page *tmp = arch_pages;
- int offset;
-
- while (tmp) {
- if (!tmp->data)
- continue;
- offset = tmp->start - (tmp->start & PAGE_MASK);
- kaddr = kmap_atomic_pfn(tmp->start >> PAGE_SHIFT, KM_USER0);
- memcpy(kaddr + offset, tmp->data + offset,
- tmp->end - tmp->start);
- kunmap_atomic(kaddr, KM_USER0);
- free_page((long)tmp->data);
- tmp->data = NULL;
- tmp = tmp->next;
- }
- return 0;
-}
-
#ifdef CONFIG_HIGHMEM
-static unsigned int count_highmem_pages(void)
+unsigned int count_highmem_pages(void)
{
struct zone *zone;
unsigned long zone_pfn;
return 0;
}
-static int save_highmem(void)
+int save_highmem(void)
{
struct zone *zone;
int res = 0;
return 0;
}
-static int restore_highmem(void)
+int restore_highmem(void)
{
printk("swsusp: Restoring Highmem\n");
while (highmem_copy) {
static inline int restore_highmem(void) {return 0;}
#endif
-unsigned int count_special_pages(void)
-{
- return count_arch_pages() + count_highmem_pages();
-}
-
-int save_special_mem(void)
-{
- int ret;
- ret = save_arch_mem();
- if (!ret)
- ret = save_highmem();
- return ret;
-}
-
-int restore_special_mem(void)
-{
- int ret;
- ret = restore_arch_mem();
- if (!ret)
- ret = restore_highmem();
- return ret;
-}
-
-static int pfn_is_nosave(unsigned long pfn)
+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;
* saveable - Determine whether a page should be cloned or not.
* @pfn: The page
*
- * 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.
+ * We save a 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 int saveable(struct zone *zone, unsigned long *zone_pfn)
+static struct page *saveable_page(unsigned long pfn)
{
- unsigned long pfn = *zone_pfn + zone->zone_start_pfn;
struct page *page;
if (!pfn_valid(pfn))
- return 0;
+ return NULL;
page = pfn_to_page(pfn);
+
if (PageNosave(page))
- return 0;
+ return NULL;
if (PageReserved(page) && pfn_is_nosave(pfn))
- return 0;
+ return NULL;
if (PageNosaveFree(page))
- return 0;
+ return NULL;
- return 1;
+ return page;
}
unsigned int count_data_pages(void)
{
struct zone *zone;
- unsigned long zone_pfn;
+ unsigned long pfn, max_zone_pfn;
unsigned int n = 0;
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);
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
+ n += !!saveable_page(pfn);
}
return n;
}
+static inline void copy_data_page(long *dst, long *src)
+{
+ int n;
+
+ /* copy_page and memcpy are not usable for copying task structs. */
+ for (n = PAGE_SIZE / sizeof(long); n; n--)
+ *dst++ = *src++;
+}
+
static void copy_data_pages(struct pbe *pblist)
{
struct zone *zone;
- unsigned long zone_pfn;
- struct pbe *pbe, *p;
+ unsigned long pfn, max_zone_pfn;
+ struct pbe *pbe;
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);
+ max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
+ for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {
+ struct page *page = saveable_page(pfn);
+
+ if (page) {
+ void *ptr = page_address(page);
+
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);
+ copy_data_page((void *)pbe->address, ptr);
+ pbe->orig_address = (unsigned long)ptr;
pbe = pbe->next;
}
}
* and we count them using unsafe_pages
*/
-static inline void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
+static void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
{
void *res;
void swsusp_free(void)
{
struct zone *zone;
- unsigned long zone_pfn;
+ unsigned long pfn, max_zone_pfn;
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);
+ 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);
int snapshot_read_next(struct snapshot_handle *handle, size_t count)
{
- if (handle->page > nr_meta_pages + nr_copy_pages)
+ if (handle->cur > nr_meta_pages + nr_copy_pages)
return 0;
if (!buffer) {
/* This makes the buffer be freed by swsusp_free() */
handle->buffer = buffer;
handle->pbe = pagedir_nosave;
}
- if (handle->prev < handle->page) {
- if (handle->page <= nr_meta_pages) {
+ if (handle->prev < handle->cur) {
+ if (handle->cur <= nr_meta_pages) {
handle->pbe = pack_orig_addresses(buffer, handle->pbe);
if (!handle->pbe)
handle->pbe = pagedir_nosave;
handle->buffer = (void *)handle->pbe->address;
handle->pbe = handle->pbe->next;
}
- handle->prev = handle->page;
+ handle->prev = handle->cur;
}
- handle->buf_offset = handle->page_offset;
- if (handle->page_offset + count >= PAGE_SIZE) {
- count = PAGE_SIZE - handle->page_offset;
- handle->page_offset = 0;
- handle->page++;
+ 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->page_offset += count;
+ handle->cur_offset += count;
}
handle->offset += count;
return count;
static int mark_unsafe_pages(struct pbe *pblist)
{
struct zone *zone;
- unsigned long zone_pfn;
+ unsigned long pfn, max_zone_pfn;
struct pbe *p;
if (!pblist) /* a sanity check */
/* Clear page flags */
for_each_zone (zone) {
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
- if (pfn_valid(zone_pfn + zone->zone_start_pfn))
- ClearPageNosaveFree(pfn_to_page(zone_pfn +
- zone->zone_start_pfn));
+ 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 orig addresses */
{
int error = 0;
- if (handle->prev && handle->page > nr_meta_pages + nr_copy_pages)
+ if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages)
return 0;
if (!buffer) {
/* This makes the buffer be freed by swsusp_free() */
}
if (!handle->offset)
handle->buffer = buffer;
- if (handle->prev < handle->page) {
+ handle->sync_read = 1;
+ if (handle->prev < handle->cur) {
if (!handle->prev) {
- error = load_header(handle, (struct swsusp_info *)buffer);
+ error = load_header(handle,
+ (struct swsusp_info *)buffer);
if (error)
return error;
} else if (handle->prev <= nr_meta_pages) {
- handle->pbe = unpack_orig_addresses(buffer, handle->pbe);
+ handle->pbe = unpack_orig_addresses(buffer,
+ handle->pbe);
if (!handle->pbe) {
error = prepare_image(handle);
if (error)
handle->pbe = pagedir_nosave;
handle->last_pbe = NULL;
handle->buffer = get_buffer(handle);
+ handle->sync_read = 0;
}
} else {
handle->pbe = handle->pbe->next;
handle->buffer = get_buffer(handle);
+ handle->sync_read = 0;
}
- handle->prev = handle->page;
+ handle->prev = handle->cur;
}
- handle->buf_offset = handle->page_offset;
- if (handle->page_offset + count >= PAGE_SIZE) {
- count = PAGE_SIZE - handle->page_offset;
- handle->page_offset = 0;
- handle->page++;
+ 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->page_offset += count;
+ handle->cur_offset += count;
}
handle->offset += count;
return count;
int snapshot_image_loaded(struct snapshot_handle *handle)
{
return !(!handle->pbe || handle->pbe->next || !nr_copy_pages ||
- handle->page <= nr_meta_pages + nr_copy_pages);
+ handle->cur <= nr_meta_pages + nr_copy_pages);
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff