#include "power.h"
+struct pbe *pagedir_nosave;
+unsigned int nr_copy_pages;
+
#ifdef CONFIG_HIGHMEM
+unsigned int count_highmem_pages(void)
+{
+ struct zone *zone;
+ unsigned long zone_pfn;
+ unsigned int n = 0;
+
+ 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++;
+ }
+ }
+ return n;
+}
+
struct highmem_page {
char *data;
struct page *page;
return 0;
}
-
-static int save_highmem(void)
+int save_highmem(void)
{
struct zone *zone;
int res = 0;
}
return 0;
}
-#else
-static int save_highmem(void) { return 0; }
-int restore_highmem(void) { return 0; }
-#endif /* CONFIG_HIGHMEM */
-
+#endif
static int pfn_is_nosave(unsigned long pfn)
{
BUG_ON(PageReserved(page) && PageNosave(page));
if (PageNosave(page))
return 0;
- if (PageReserved(page) && pfn_is_nosave(pfn)) {
- pr_debug("[nosave pfn 0x%lx]", pfn);
+ if (PageReserved(page) && pfn_is_nosave(pfn))
return 0;
- }
if (PageNosaveFree(page))
return 0;
return 1;
}
-static unsigned count_data_pages(void)
+unsigned int count_data_pages(void)
{
struct zone *zone;
unsigned long zone_pfn;
* free_pagedir - free pages allocated with alloc_pagedir()
*/
-static void free_pagedir(struct pbe *pblist)
+void free_pagedir(struct pbe *pblist)
{
struct pbe *pbe;
* of memory pages allocated with alloc_pagedir()
*/
-void create_pbe_list(struct pbe *pblist, unsigned int nr_pages)
+static inline void create_pbe_list(struct pbe *pblist, unsigned int nr_pages)
{
struct pbe *pbpage, *p;
unsigned int num = PBES_PER_PAGE;
p->next = p + 1;
p->next = NULL;
}
- pr_debug("create_pbe_list(): initialized %d PBEs\n", num);
}
-static void *alloc_image_page(void)
+/**
+ * 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)
+ */
+
+struct eaten_page {
+ struct eaten_page *next;
+ char padding[PAGE_SIZE - sizeof(void *)];
+};
+
+static struct eaten_page *eaten_pages = NULL;
+
+void release_eaten_pages(void)
{
- void *res = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_COLD);
+ struct eaten_page *p, *q;
+
+ 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;
+ }
+ eaten_pages = NULL;
+}
+
+/**
+ * @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.
+ *
+ * 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
+ */
+
+static inline void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
+{
+ void *res;
+
+ if (safe_needed)
+ 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;
}
+unsigned long get_safe_page(gfp_t gfp_mask)
+{
+ return (unsigned long)alloc_image_page(gfp_mask, 1);
+}
+
/**
* alloc_pagedir - Allocate the page directory.
*
* On each page we set up a list of struct_pbe elements.
*/
-struct pbe *alloc_pagedir(unsigned int nr_pages)
+struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask, int safe_needed)
{
unsigned int num;
struct pbe *pblist, *pbe;
return NULL;
pr_debug("alloc_pagedir(): nr_pages = %d\n", nr_pages);
- pblist = alloc_image_page();
+ 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();
+ 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;
}
static int enough_free_mem(unsigned int nr_pages)
{
- pr_debug("swsusp: available memory: %u pages\n", nr_free_pages());
- return nr_free_pages() > (nr_pages + PAGES_FOR_IO +
+ struct zone *zone;
+ unsigned int n = 0;
+
+ for_each_zone (zone)
+ 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);
}
+int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed)
+{
+ struct pbe *p;
+
+ for_each_pbe (p, pblist) {
+ p->address = (unsigned long)alloc_image_page(gfp_mask, safe_needed);
+ if (!p->address)
+ return -ENOMEM;
+ }
+ return 0;
+}
static struct pbe *swsusp_alloc(unsigned int nr_pages)
{
- struct pbe *pblist, *p;
+ struct pbe *pblist;
- if (!(pblist = alloc_pagedir(nr_pages))) {
+ if (!(pblist = alloc_pagedir(nr_pages, GFP_ATOMIC | __GFP_COLD, 0))) {
printk(KERN_ERR "suspend: Allocating pagedir failed.\n");
return NULL;
}
- create_pbe_list(pblist, nr_pages);
- for_each_pbe (p, pblist) {
- p->address = (unsigned long)alloc_image_page();
- if (!p->address) {
- printk(KERN_ERR "suspend: Allocating image pages failed.\n");
- swsusp_free();
- return NULL;
- }
+ if (alloc_data_pages(pblist, GFP_ATOMIC | __GFP_COLD, 0)) {
+ printk(KERN_ERR "suspend: Allocating image pages failed.\n");
+ swsusp_free();
+ return NULL;
}
return pblist;
unsigned int nr_pages;
pr_debug("swsusp: critical section: \n");
- if (save_highmem()) {
- printk(KERN_CRIT "swsusp: Not enough free pages for highmem\n");
- restore_highmem();
- return -ENOMEM;
- }
drain_local_pages();
nr_pages = count_data_pages();
(nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE,
PAGES_FOR_IO, nr_free_pages());
- /* This is needed because of the fixed size of swsusp_info */
- if (MAX_PBES < (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE)
- return -ENOSPC;
-
if (!enough_free_mem(nr_pages)) {
printk(KERN_ERR "swsusp: Not enough free memory\n");
return -ENOMEM;
}
- if (!enough_swap(nr_pages)) {
- printk(KERN_ERR "swsusp: Not enough free swap\n");
- return -ENOSPC;
- }
-
pagedir_nosave = swsusp_alloc(nr_pages);
if (!pagedir_nosave)
return -ENOMEM;
projects / linux-2.6-omap-h63xx.git / blobdiff