*/
-#include <linux/version.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/suspend.h>
#include "power.h"
struct pbe *pagedir_nosave;
-static unsigned int nr_copy_pages;
-static unsigned int nr_meta_pages;
-static unsigned long *buffer;
+unsigned int nr_copy_pages;
#ifdef CONFIG_HIGHMEM
unsigned int count_highmem_pages(void)
void *kaddr;
unsigned long pfn = zone_pfn + zone->zone_start_pfn;
- if (!(pfn%10000))
+ if (!(pfn%1000))
printk(".");
if (!pfn_valid(pfn))
continue;
struct zone *zone;
int res = 0;
- pr_debug("swsusp: Saving Highmem");
- drain_local_pages();
+ pr_debug("swsusp: Saving Highmem\n");
for_each_zone (zone) {
if (is_highmem(zone))
res = save_highmem_zone(zone);
if (res)
return res;
}
- printk("\n");
return 0;
}
}
return 0;
}
-#else
-static inline unsigned int count_highmem_pages(void) {return 0;}
-static inline int save_highmem(void) {return 0;}
-static inline int restore_highmem(void) {return 0;}
#endif
-static inline int pfn_is_nosave(unsigned long pfn)
+static 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 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.
+ * 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.
*/
-static struct page *saveable_page(unsigned long pfn)
+static int saveable(struct zone *zone, unsigned long *zone_pfn)
{
+ unsigned long pfn = *zone_pfn + zone->zone_start_pfn;
struct page *page;
if (!pfn_valid(pfn))
- return NULL;
+ return 0;
page = pfn_to_page(pfn);
-
+ BUG_ON(PageReserved(page) && PageNosave(page));
if (PageNosave(page))
- return NULL;
+ return 0;
if (PageReserved(page) && pfn_is_nosave(pfn))
- return NULL;
+ return 0;
if (PageNosaveFree(page))
- return NULL;
+ return 0;
- return page;
+ return 1;
}
unsigned int count_data_pages(void)
{
struct zone *zone;
- unsigned long pfn, max_zone_pfn;
+ unsigned long zone_pfn;
unsigned int n = 0;
for_each_zone (zone) {
if (is_highmem(zone))
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++)
- n += !!saveable_page(pfn);
+ for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
+ n += saveable(zone, &zone_pfn);
}
return n;
}
static void copy_data_pages(struct pbe *pblist)
{
struct zone *zone;
- unsigned long pfn, max_zone_pfn;
+ unsigned long zone_pfn;
struct pbe *pbe, *p;
pbe = pblist;
SetPageNosaveFree(virt_to_page(p));
for_each_pbe (p, pblist)
SetPageNosaveFree(virt_to_page(p->address));
- 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) {
- long *src, *dst;
- int n;
-
+ 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 and memcpy are not usable for copying task structs. */
- dst = (long *)pbe->address;
- src = (long *)pbe->orig_address;
- for (n = PAGE_SIZE / sizeof(long); n; n--)
- *dst++ = *src++;
+ /* copy_page is not usable for copying task structs. */
+ memcpy((void *)pbe->address, (void *)pbe->orig_address, PAGE_SIZE);
pbe = pbe->next;
}
}
* free_pagedir - free pages allocated with alloc_pagedir()
*/
-static void free_pagedir(struct pbe *pblist, int clear_nosave_free)
+void free_pagedir(struct pbe *pblist)
{
struct pbe *pbe;
while (pblist) {
pbe = (pblist + PB_PAGE_SKIP)->next;
ClearPageNosave(virt_to_page(pblist));
- if (clear_nosave_free)
- ClearPageNosaveFree(virt_to_page(pblist));
+ ClearPageNosaveFree(virt_to_page(pblist));
free_page((unsigned long)pblist);
pblist = pbe;
}
}
}
-static unsigned int unsafe_pages;
+/**
+ * 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;
+}
/**
* @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.
+ * which had been used before suspend.
*
* The unsafe pages are marked with the PG_nosave_free flag
- * and we count them using unsafe_pages
+ *
+ * Allocated but unusable (ie eaten) memory pages should be marked
+ * so that swsusp_free() can release them
*/
-static void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
+static inline void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
{
void *res;
- 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));
- unsafe_pages++;
+ 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));
* On each page we set up a list of struct_pbe elements.
*/
-static struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask,
- int safe_needed)
+struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask, int safe_needed)
{
unsigned int num;
struct pbe *pblist, *pbe;
if (!nr_pages)
return NULL;
+ 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->next = alloc_image_page(gfp_mask, safe_needed);
}
if (!pbe) { /* get_zeroed_page() failed */
- free_pagedir(pblist, 1);
+ free_pagedir(pblist);
pblist = NULL;
} else
- create_pbe_list(pblist, nr_pages);
+ create_pbe_list(pblist, nr_pages);
return pblist;
}
void swsusp_free(void)
{
struct zone *zone;
- unsigned long pfn, max_zone_pfn;
+ unsigned long 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);
-
+ 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);
}
}
}
- nr_copy_pages = 0;
- nr_meta_pages = 0;
- pagedir_nosave = NULL;
- buffer = NULL;
}
(nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
}
-static int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed)
+int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed)
{
struct pbe *p;
*/
nr_copy_pages = nr_pages;
- nr_meta_pages = (nr_pages * sizeof(long) + PAGE_SIZE - 1) >> PAGE_SHIFT;
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, &system_utsname, sizeof(system_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_orig_addresses - the .orig_address fields of the PBEs from the
- * list starting at @pbe are stored in the array @buf[] (1 page)
- */
-
-static inline struct pbe *pack_orig_addresses(unsigned long *buf, struct pbe *pbe)
-{
- int j;
-
- for (j = 0; j < PAGE_SIZE / sizeof(long) && pbe; j++) {
- buf[j] = pbe->orig_address;
- pbe = pbe->next;
- }
- if (!pbe)
- for (; j < PAGE_SIZE / sizeof(long); j++)
- buf[j] = 0;
- return pbe;
-}
-
-/**
- * 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 = alloc_image_page(GFP_ATOMIC, 0);
- if (!buffer)
- return -ENOMEM;
- }
- if (!handle->offset) {
- init_header((struct swsusp_info *)buffer);
- handle->buffer = buffer;
- handle->pbe = pagedir_nosave;
- }
- 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;
- } else {
- handle->buffer = (void *)handle->pbe->address;
- handle->pbe = handle->pbe->next;
- }
- 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 pbe *pblist)
-{
- struct zone *zone;
- unsigned long pfn, max_zone_pfn;
- struct pbe *p;
-
- if (!pblist) /* a sanity check */
- return -EINVAL;
-
- /* 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 orig addresses */
- for_each_pbe (p, pblist) {
- if (virt_addr_valid(p->orig_address))
- SetPageNosaveFree(virt_to_page(p->orig_address));
- else
- return -EFAULT;
- }
-
- unsafe_pages = 0;
-
- return 0;
-}
-
-static void copy_page_backup_list(struct pbe *dst, struct pbe *src)
-{
- /* We assume both lists contain the same number of elements */
- while (src) {
- dst->orig_address = src->orig_address;
- dst = dst->next;
- src = src->next;
- }
-}
-
-static 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,system_utsname.sysname))
- reason = "system type";
- if (strcmp(info->uts.release,system_utsname.release))
- reason = "kernel release";
- if (strcmp(info->uts.version,system_utsname.version))
- reason = "version";
- if (strcmp(info->uts.machine,system_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 snapshot_handle *handle,
- struct swsusp_info *info)
-{
- int error;
- struct pbe *pblist;
-
- error = check_header(info);
- if (!error) {
- pblist = alloc_pagedir(info->image_pages, GFP_ATOMIC, 0);
- if (!pblist)
- return -ENOMEM;
- pagedir_nosave = pblist;
- handle->pbe = pblist;
- nr_copy_pages = info->image_pages;
- nr_meta_pages = info->pages - info->image_pages - 1;
- }
- return error;
-}
-
-/**
- * unpack_orig_addresses - copy the elements of @buf[] (1 page) to
- * the PBEs in the list starting at @pbe
- */
-
-static inline struct pbe *unpack_orig_addresses(unsigned long *buf,
- struct pbe *pbe)
-{
- int j;
-
- for (j = 0; j < PAGE_SIZE / sizeof(long) && pbe; j++) {
- pbe->orig_address = buf[j];
- pbe = pbe->next;
- }
- return pbe;
-}
-
-/**
- * prepare_image - use metadata contained in the PBE list
- * pointed to by pagedir_nosave to mark the pages that will
- * be overwritten in the process of restoring the system
- * memory state from the image ("unsafe" pages) and allocate
- * memory for the image
- *
- * The idea is to allocate the PBE list first and then
- * allocate as many pages as it's needed for the image data,
- * but not to assign these pages to the PBEs initially.
- * Instead, we just mark them as allocated and create a list
- * of "safe" which will be used later
- */
-
-struct safe_page {
- struct safe_page *next;
- char padding[PAGE_SIZE - sizeof(void *)];
-};
-
-static struct safe_page *safe_pages;
-
-static int prepare_image(struct snapshot_handle *handle)
-{
- int error = 0;
- unsigned int nr_pages = nr_copy_pages;
- struct pbe *p, *pblist = NULL;
-
- p = pagedir_nosave;
- error = mark_unsafe_pages(p);
- if (!error) {
- pblist = alloc_pagedir(nr_pages, GFP_ATOMIC, 1);
- if (pblist)
- copy_page_backup_list(pblist, p);
- free_pagedir(p, 0);
- if (!pblist)
- error = -ENOMEM;
- }
- safe_pages = NULL;
- if (!error && nr_pages > unsafe_pages) {
- nr_pages -= unsafe_pages;
- while (nr_pages--) {
- struct safe_page *ptr;
-
- ptr = (struct safe_page *)get_zeroed_page(GFP_ATOMIC);
- if (!ptr) {
- error = -ENOMEM;
- break;
- }
- if (!PageNosaveFree(virt_to_page(ptr))) {
- /* The page is "safe", add it to the list */
- ptr->next = safe_pages;
- safe_pages = ptr;
- }
- /* Mark the page as allocated */
- SetPageNosave(virt_to_page(ptr));
- SetPageNosaveFree(virt_to_page(ptr));
- }
- }
- if (!error) {
- pagedir_nosave = pblist;
- } else {
- handle->pbe = NULL;
- swsusp_free();
- }
- return error;
-}
-
-static void *get_buffer(struct snapshot_handle *handle)
-{
- struct pbe *pbe = handle->pbe, *last = handle->last_pbe;
- struct page *page = virt_to_page(pbe->orig_address);
-
- if (PageNosave(page) && PageNosaveFree(page)) {
- /*
- * We have allocated the "original" page frame and we can
- * use it directly to store the read page
- */
- pbe->address = 0;
- if (last && last->next)
- last->next = NULL;
- return (void *)pbe->orig_address;
- }
- /*
- * The "original" page frame has not been allocated and we have to
- * use a "safe" page frame to store the read page
- */
- pbe->address = (unsigned long)safe_pages;
- safe_pages = safe_pages->next;
- if (last)
- last->next = pbe;
- handle->last_pbe = pbe;
- return (void *)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)
-{
- int error = 0;
-
- if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages)
- return 0;
- if (!buffer) {
- /* This makes the buffer be freed by swsusp_free() */
- buffer = alloc_image_page(GFP_ATOMIC, 0);
- if (!buffer)
- return -ENOMEM;
- }
- if (!handle->offset)
- handle->buffer = buffer;
- handle->sync_read = 1;
- if (handle->prev < handle->cur) {
- if (!handle->prev) {
- 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);
- if (!handle->pbe) {
- error = prepare_image(handle);
- if (error)
- return 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->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;
-}
-
-int snapshot_image_loaded(struct snapshot_handle *handle)
-{
- return !(!handle->pbe || handle->pbe->next || !nr_copy_pages ||
- handle->cur <= nr_meta_pages + nr_copy_pages);
-}
git://git.onelab.eu / linux-2.6.git / blobdiff