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-rw-r--r--kernel/power/snapshot.c89
1 files changed, 74 insertions, 15 deletions
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 4a6dbcefd378..41f66365f0d8 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -33,7 +33,35 @@
#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;
@@ -149,17 +177,15 @@ static int saveable(struct zone *zone, unsigned long *zone_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;
@@ -244,7 +270,7 @@ static inline void fill_pb_page(struct pbe *pbpage)
* 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;
@@ -261,7 +287,35 @@ void create_pbe_list(struct pbe *pblist, unsigned int nr_pages)
p->next = p + 1;
p->next = NULL;
}
- pr_debug("create_pbe_list(): initialized %d PBEs\n", num);
+}
+
+/**
+ * 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)
+{
+ 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;
}
/**
@@ -282,9 +336,12 @@ static inline void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
if (safe_needed)
do {
res = (void *)get_zeroed_page(gfp_mask);
- if (res && PageNosaveFree(virt_to_page(res)))
+ 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);
@@ -332,7 +389,8 @@ struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask, int safe_needed
if (!pbe) { /* get_zeroed_page() failed */
free_pagedir(pblist);
pblist = NULL;
- }
+ } else
+ create_pbe_list(pblist, nr_pages);
return pblist;
}
@@ -370,8 +428,14 @@ void swsusp_free(void)
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);
}
@@ -395,7 +459,6 @@ static struct pbe *swsusp_alloc(unsigned int nr_pages)
printk(KERN_ERR "suspend: Allocating pagedir failed.\n");
return NULL;
}
- create_pbe_list(pblist, nr_pages);
if (alloc_data_pages(pblist, GFP_ATOMIC | __GFP_COLD, 0)) {
printk(KERN_ERR "suspend: Allocating image pages failed.\n");
@@ -421,10 +484,6 @@ asmlinkage int swsusp_save(void)
(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;