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-rw-r--r--kernel/power/Makefile2
-rw-r--r--kernel/power/disk.c22
-rw-r--r--kernel/power/main.c5
-rw-r--r--kernel/power/power.h17
-rw-r--r--kernel/power/snapshot.c435
-rw-r--r--kernel/power/swsusp.c569
6 files changed, 511 insertions, 539 deletions
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 2f438d0eaa1..c71eb4579c0 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -4,7 +4,7 @@ EXTRA_CFLAGS += -DDEBUG
endif
obj-y := main.o process.o console.o pm.o
-obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o disk.o
+obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o disk.o snapshot.o
obj-$(CONFIG_SUSPEND_SMP) += smp.o
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 761956e813f..027322a564f 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -30,7 +30,6 @@ extern int swsusp_check(void);
extern int swsusp_read(void);
extern void swsusp_close(void);
extern int swsusp_resume(void);
-extern int swsusp_free(void);
static int noresume = 0;
@@ -93,10 +92,7 @@ static void free_some_memory(void)
printk("Freeing memory... ");
while ((tmp = shrink_all_memory(10000))) {
pages += tmp;
- printk("\b%c", p[i]);
- i++;
- if (i > 3)
- i = 0;
+ printk("\b%c", p[i++ % 4]);
}
printk("\bdone (%li pages freed)\n", pages);
}
@@ -178,13 +174,12 @@ int pm_suspend_disk(void)
goto Done;
if (in_suspend) {
+ device_resume();
pr_debug("PM: writing image.\n");
error = swsusp_write();
if (!error)
power_down(pm_disk_mode);
else {
- /* swsusp_write can not fail in device_resume,
- no need to do second device_resume */
swsusp_free();
unprepare_processes();
return error;
@@ -252,14 +247,17 @@ static int software_resume(void)
pr_debug("PM: Reading swsusp image.\n");
- if ((error = swsusp_read()))
- goto Cleanup;
+ if ((error = swsusp_read())) {
+ swsusp_free();
+ goto Thaw;
+ }
pr_debug("PM: Preparing devices for restore.\n");
if ((error = device_suspend(PMSG_FREEZE))) {
printk("Some devices failed to suspend\n");
- goto Free;
+ swsusp_free();
+ goto Thaw;
}
mb();
@@ -268,9 +266,7 @@ static int software_resume(void)
swsusp_resume();
pr_debug("PM: Restore failed, recovering.n");
device_resume();
- Free:
- swsusp_free();
- Cleanup:
+ Thaw:
unprepare_processes();
Done:
/* For success case, the suspend path will release the lock */
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 22bdc93cc03..18d7d693fbb 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -167,6 +167,8 @@ static int enter_state(suspend_state_t state)
{
int error;
+ if (pm_ops->valid && !pm_ops->valid(state))
+ return -ENODEV;
if (down_trylock(&pm_sem))
return -EBUSY;
@@ -236,7 +238,8 @@ static ssize_t state_show(struct subsystem * subsys, char * buf)
char * s = buf;
for (i = 0; i < PM_SUSPEND_MAX; i++) {
- if (pm_states[i])
+ if (pm_states[i] && pm_ops && (!pm_ops->valid
+ ||(pm_ops->valid && pm_ops->valid(i))))
s += sprintf(s,"%s ",pm_states[i]);
}
s += sprintf(s,"\n");
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 6748de23e83..d4fd96a135a 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -53,3 +53,20 @@ extern void thaw_processes(void);
extern int pm_prepare_console(void);
extern void pm_restore_console(void);
+
+
+/* References to section boundaries */
+extern const void __nosave_begin, __nosave_end;
+
+extern unsigned int nr_copy_pages;
+extern suspend_pagedir_t *pagedir_nosave;
+extern suspend_pagedir_t *pagedir_save;
+
+extern asmlinkage int swsusp_arch_suspend(void);
+extern asmlinkage int swsusp_arch_resume(void);
+
+extern int restore_highmem(void);
+extern struct pbe * alloc_pagedir(unsigned nr_pages);
+extern void create_pbe_list(struct pbe *pblist, unsigned nr_pages);
+extern void swsusp_free(void);
+extern int enough_swap(unsigned nr_pages);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
new file mode 100644
index 00000000000..42a62870439
--- /dev/null
+++ b/kernel/power/snapshot.c
@@ -0,0 +1,435 @@
+/*
+ * linux/kernel/power/snapshot.c
+ *
+ * This file provide system snapshot/restore functionality.
+ *
+ * Copyright (C) 1998-2005 Pavel Machek <pavel@suse.cz>
+ *
+ * This file is released under the GPLv2, and is based on swsusp.c.
+ *
+ */
+
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/suspend.h>
+#include <linux/smp_lock.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/bootmem.h>
+#include <linux/syscalls.h>
+#include <linux/console.h>
+#include <linux/highmem.h>
+
+#include <asm/uaccess.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/io.h>
+
+#include "power.h"
+
+#ifdef CONFIG_HIGHMEM
+struct highmem_page {
+ char *data;
+ struct page *page;
+ struct highmem_page *next;
+};
+
+static struct highmem_page *highmem_copy;
+
+static int save_highmem_zone(struct zone *zone)
+{
+ unsigned long zone_pfn;
+ mark_free_pages(zone);
+ for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) {
+ struct page *page;
+ struct highmem_page *save;
+ void *kaddr;
+ unsigned long pfn = zone_pfn + zone->zone_start_pfn;
+
+ if (!(pfn%1000))
+ printk(".");
+ if (!pfn_valid(pfn))
+ continue;
+ page = pfn_to_page(pfn);
+ /*
+ * This condition results from rvmalloc() sans vmalloc_32()
+ * and architectural memory reservations. This should be
+ * corrected eventually when the cases giving rise to this
+ * are better understood.
+ */
+ if (PageReserved(page)) {
+ printk("highmem reserved page?!\n");
+ continue;
+ }
+ BUG_ON(PageNosave(page));
+ if (PageNosaveFree(page))
+ continue;
+ save = kmalloc(sizeof(struct highmem_page), GFP_ATOMIC);
+ if (!save)
+ return -ENOMEM;
+ save->next = highmem_copy;
+ save->page = page;
+ save->data = (void *) get_zeroed_page(GFP_ATOMIC);
+ if (!save->data) {
+ kfree(save);
+ return -ENOMEM;
+ }
+ kaddr = kmap_atomic(page, KM_USER0);
+ memcpy(save->data, kaddr, PAGE_SIZE);
+ kunmap_atomic(kaddr, KM_USER0);
+ highmem_copy = save;
+ }
+ return 0;
+}
+
+
+static int save_highmem(void)
+{
+ struct zone *zone;
+ int res = 0;
+
+ pr_debug("swsusp: Saving Highmem\n");
+ for_each_zone (zone) {
+ if (is_highmem(zone))
+ res = save_highmem_zone(zone);
+ if (res)
+ return res;
+ }
+ return 0;
+}
+
+int restore_highmem(void)
+{
+ printk("swsusp: Restoring Highmem\n");
+ while (highmem_copy) {
+ struct highmem_page *save = highmem_copy;
+ void *kaddr;
+ highmem_copy = save->next;
+
+ kaddr = kmap_atomic(save->page, KM_USER0);
+ memcpy(kaddr, save->data, PAGE_SIZE);
+ kunmap_atomic(kaddr, KM_USER0);
+ free_page((long) save->data);
+ kfree(save);
+ }
+ return 0;
+}
+#else
+static int save_highmem(void) { return 0; }
+int restore_highmem(void) { return 0; }
+#endif /* CONFIG_HIGHMEM */
+
+
+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;
+ return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
+}
+
+/**
+ * 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.
+ */
+
+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 0;
+
+ page = pfn_to_page(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);
+ return 0;
+ }
+ if (PageNosaveFree(page))
+ return 0;
+
+ return 1;
+}
+
+static unsigned count_data_pages(void)
+{
+ struct zone *zone;
+ unsigned long zone_pfn;
+ unsigned n;
+
+ 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);
+ }
+ return n;
+}
+
+static void copy_data_pages(struct pbe *pblist)
+{
+ struct zone *zone;
+ unsigned long zone_pfn;
+ struct pbe *pbe, *p;
+
+ 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);
+ 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);
+ pbe = pbe->next;
+ }
+ }
+ }
+ BUG_ON(pbe);
+}
+
+
+/**
+ * free_pagedir - free pages allocated with alloc_pagedir()
+ */
+
+static void free_pagedir(struct pbe *pblist)
+{
+ struct pbe *pbe;
+
+ while (pblist) {
+ pbe = (pblist + PB_PAGE_SKIP)->next;
+ ClearPageNosave(virt_to_page(pblist));
+ ClearPageNosaveFree(virt_to_page(pblist));
+ free_page((unsigned long)pblist);
+ pblist = pbe;
+ }
+}
+
+/**
+ * fill_pb_page - Create a list of PBEs on a given memory page
+ */
+
+static inline void fill_pb_page(struct pbe *pbpage)
+{
+ struct pbe *p;
+
+ p = pbpage;
+ pbpage += PB_PAGE_SKIP;
+ do
+ p->next = p + 1;
+ while (++p < pbpage);
+}
+
+/**
+ * create_pbe_list - Create a list of PBEs on top of a given chain
+ * of memory pages allocated with alloc_pagedir()
+ */
+
+void create_pbe_list(struct pbe *pblist, unsigned nr_pages)
+{
+ struct pbe *pbpage, *p;
+ unsigned num = PBES_PER_PAGE;
+
+ for_each_pb_page (pbpage, pblist) {
+ if (num >= nr_pages)
+ break;
+
+ fill_pb_page(pbpage);
+ num += PBES_PER_PAGE;
+ }
+ if (pbpage) {
+ for (num -= PBES_PER_PAGE - 1, p = pbpage; num < nr_pages; p++, num++)
+ p->next = p + 1;
+ p->next = NULL;
+ }
+ pr_debug("create_pbe_list(): initialized %d PBEs\n", num);
+}
+
+static void *alloc_image_page(void)
+{
+ void *res = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_COLD);
+ if (res) {
+ SetPageNosave(virt_to_page(res));
+ SetPageNosaveFree(virt_to_page(res));
+ }
+ return res;
+}
+
+/**
+ * alloc_pagedir - Allocate the page directory.
+ *
+ * First, determine exactly how many pages we need and
+ * allocate them.
+ *
+ * We arrange the pages in a chain: each page is an array of PBES_PER_PAGE
+ * struct pbe elements (pbes) and the last element in the page points
+ * to the next page.
+ *
+ * On each page we set up a list of struct_pbe elements.
+ */
+
+struct pbe *alloc_pagedir(unsigned nr_pages)
+{
+ unsigned num;
+ struct pbe *pblist, *pbe;
+
+ if (!nr_pages)
+ return NULL;
+
+ pr_debug("alloc_pagedir(): nr_pages = %d\n", nr_pages);
+ pblist = alloc_image_page();
+ /* 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();
+ }
+ if (!pbe) { /* get_zeroed_page() failed */
+ free_pagedir(pblist);
+ pblist = NULL;
+ }
+ return pblist;
+}
+
+/**
+ * Free pages we allocated for suspend. Suspend pages are alocated
+ * before atomic copy, so we need to free them after resume.
+ */
+
+void swsusp_free(void)
+{
+ struct zone *zone;
+ unsigned long 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);
+ if (PageNosave(page) && PageNosaveFree(page)) {
+ ClearPageNosave(page);
+ ClearPageNosaveFree(page);
+ free_page((long) page_address(page));
+ }
+ }
+ }
+}
+
+
+/**
+ * enough_free_mem - Make sure we enough free memory to snapshot.
+ *
+ * Returns TRUE or FALSE after checking the number of available
+ * free pages.
+ */
+
+static int enough_free_mem(unsigned nr_pages)
+{
+ pr_debug("swsusp: available memory: %u pages\n", nr_free_pages());
+ return nr_free_pages() > (nr_pages + PAGES_FOR_IO +
+ (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
+}
+
+
+static struct pbe *swsusp_alloc(unsigned nr_pages)
+{
+ struct pbe *pblist, *p;
+
+ if (!(pblist = alloc_pagedir(nr_pages))) {
+ 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;
+ }
+ }
+
+ return pblist;
+}
+
+asmlinkage int swsusp_save(void)
+{
+ unsigned 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();
+ printk("swsusp: Need to copy %u pages\n", nr_pages);
+
+ pr_debug("swsusp: pages needed: %u + %lu + %u, free: %u\n",
+ nr_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;
+
+ /* During allocating of suspend pagedir, new cold pages may appear.
+ * Kill them.
+ */
+ drain_local_pages();
+ copy_data_pages(pagedir_nosave);
+
+ /*
+ * End of critical section. From now on, we can write to memory,
+ * but we should not touch disk. This specially means we must _not_
+ * touch swap space! Except we must write out our image of course.
+ */
+
+ nr_copy_pages = nr_pages;
+
+ printk("swsusp: critical section/: done (%d pages copied)\n", nr_pages);
+ return 0;
+}
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 2d5c4567644..12db1d2ad61 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -1,11 +1,10 @@
/*
* linux/kernel/power/swsusp.c
*
- * This file is to realize architecture-independent
- * machine suspend feature using pretty near only high-level routines
+ * This file provides code to write suspend image to swap and read it back.
*
* Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
- * Copyright (C) 1998,2001-2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@suse.cz>
*
* This file is released under the GPLv2.
*
@@ -47,11 +46,7 @@
#include <linux/utsname.h>
#include <linux/version.h>
#include <linux/delay.h>
-#include <linux/reboot.h>
#include <linux/bitops.h>
-#include <linux/vt_kern.h>
-#include <linux/kbd_kern.h>
-#include <linux/keyboard.h>
#include <linux/spinlock.h>
#include <linux/genhd.h>
#include <linux/kernel.h>
@@ -63,10 +58,8 @@
#include <linux/swapops.h>
#include <linux/bootmem.h>
#include <linux/syscalls.h>
-#include <linux/console.h>
#include <linux/highmem.h>
#include <linux/bio.h>
-#include <linux/mount.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
@@ -84,16 +77,10 @@
#define MAXKEY 32
#define MAXIV 32
-/* References to section boundaries */
-extern const void __nosave_begin, __nosave_end;
-
-/* Variables to be preserved over suspend */
-static int nr_copy_pages_check;
-
extern char resume_file[];
/* Local variables that should not be affected by save */
-static unsigned int nr_copy_pages __nosavedata = 0;
+unsigned int nr_copy_pages __nosavedata = 0;
/* Suspend pagedir is allocated before final copy, therefore it
must be freed after resume
@@ -109,7 +96,7 @@ static unsigned int nr_copy_pages __nosavedata = 0;
MMU hardware.
*/
suspend_pagedir_t *pagedir_nosave __nosavedata = NULL;
-static suspend_pagedir_t *pagedir_save;
+suspend_pagedir_t *pagedir_save;
#define SWSUSP_SIG "S1SUSPEND"
@@ -124,12 +111,6 @@ static struct swsusp_header {
static struct swsusp_info swsusp_info;
/*
- * XXX: We try to keep some more pages free so that I/O operations succeed
- * without paging. Might this be more?
- */
-#define PAGES_FOR_IO 512
-
-/*
* Saving part...
*/
@@ -552,346 +533,6 @@ static int write_suspend_image(void)
goto Done;
}
-
-#ifdef CONFIG_HIGHMEM
-struct highmem_page {
- char *data;
- struct page *page;
- struct highmem_page *next;
-};
-
-static struct highmem_page *highmem_copy;
-
-static int save_highmem_zone(struct zone *zone)
-{
- unsigned long zone_pfn;
- mark_free_pages(zone);
- for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) {
- struct page *page;
- struct highmem_page *save;
- void *kaddr;
- unsigned long pfn = zone_pfn + zone->zone_start_pfn;
-
- if (!(pfn%1000))
- printk(".");
- if (!pfn_valid(pfn))
- continue;
- page = pfn_to_page(pfn);
- /*
- * This condition results from rvmalloc() sans vmalloc_32()
- * and architectural memory reservations. This should be
- * corrected eventually when the cases giving rise to this
- * are better understood.
- */
- if (PageReserved(page)) {
- printk("highmem reserved page?!\n");
- continue;
- }
- BUG_ON(PageNosave(page));
- if (PageNosaveFree(page))
- continue;
- save = kmalloc(sizeof(struct highmem_page), GFP_ATOMIC);
- if (!save)
- return -ENOMEM;
- save->next = highmem_copy;
- save->page = page;
- save->data = (void *) get_zeroed_page(GFP_ATOMIC);
- if (!save->data) {
- kfree(save);
- return -ENOMEM;
- }
- kaddr = kmap_atomic(page, KM_USER0);
- memcpy(save->data, kaddr, PAGE_SIZE);
- kunmap_atomic(kaddr, KM_USER0);
- highmem_copy = save;
- }
- return 0;
-}
-#endif /* CONFIG_HIGHMEM */
-
-
-static int save_highmem(void)
-{
-#ifdef CONFIG_HIGHMEM
- struct zone *zone;
- int res = 0;
-
- pr_debug("swsusp: Saving Highmem\n");
- for_each_zone (zone) {
- if (is_highmem(zone))
- res = save_highmem_zone(zone);
- if (res)
- return res;
- }
-#endif
- return 0;
-}
-
-static int restore_highmem(void)
-{
-#ifdef CONFIG_HIGHMEM
- printk("swsusp: Restoring Highmem\n");
- while (highmem_copy) {
- struct highmem_page *save = highmem_copy;
- void *kaddr;
- highmem_copy = save->next;
-
- kaddr = kmap_atomic(save->page, KM_USER0);
- memcpy(kaddr, save->data, PAGE_SIZE);
- kunmap_atomic(kaddr, KM_USER0);
- free_page((long) save->data);
- kfree(save);
- }
-#endif
- return 0;
-}
-
-
-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;
- return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
-}
-
-/**
- * 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.
- */
-
-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 0;
-
- page = pfn_to_page(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);
- return 0;
- }
- if (PageNosaveFree(page))
- return 0;
-
- return 1;
-}
-
-static void count_data_pages(void)
-{
- struct zone *zone;
- unsigned long zone_pfn;
-
- nr_copy_pages = 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)
- nr_copy_pages += saveable(zone, &zone_pfn);
- }
-}
-
-
-static void copy_data_pages(void)
-{
- struct zone *zone;
- unsigned long zone_pfn;
- struct pbe * pbe = pagedir_nosave;
-
- pr_debug("copy_data_pages(): pages to copy: %d\n", nr_copy_pages);
- for_each_zone (zone) {
- if (is_highmem(zone))
- continue;
- mark_free_pages(zone);
- 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 = (long) page_address(page);
- /* copy_page is not usable for copying task structs. */
- memcpy((void *)pbe->address, (void *)pbe->orig_address, PAGE_SIZE);
- pbe = pbe->next;
- }
- }
- }
- BUG_ON(pbe);
-}
-
-
-/**
- * calc_nr - Determine the number of pages needed for a pbe list.
- */
-
-static int calc_nr(int nr_copy)
-{
- return nr_copy + (nr_copy+PBES_PER_PAGE-2)/(PBES_PER_PAGE-1);
-}
-
-/**
- * free_pagedir - free pages allocated with alloc_pagedir()
- */
-
-static inline void free_pagedir(struct pbe *pblist)
-{
- struct pbe *pbe;
-
- while (pblist) {
- pbe = (pblist + PB_PAGE_SKIP)->next;
- free_page((unsigned long)pblist);
- pblist = pbe;
- }
-}
-
-/**
- * fill_pb_page - Create a list of PBEs on a given memory page
- */
-
-static inline void fill_pb_page(struct pbe *pbpage)
-{
- struct pbe *p;
-
- p = pbpage;
- pbpage += PB_PAGE_SKIP;
- do
- p->next = p + 1;
- while (++p < pbpage);
-}
-
-/**
- * create_pbe_list - Create a list of PBEs on top of a given chain
- * of memory pages allocated with alloc_pagedir()
- */
-
-static void create_pbe_list(struct pbe *pblist, unsigned nr_pages)
-{
- struct pbe *pbpage, *p;
- unsigned num = PBES_PER_PAGE;
-
- for_each_pb_page (pbpage, pblist) {
- if (num >= nr_pages)
- break;
-
- fill_pb_page(pbpage);
- num += PBES_PER_PAGE;
- }
- if (pbpage) {
- for (num -= PBES_PER_PAGE - 1, p = pbpage; num < nr_pages; p++, num++)
- p->next = p + 1;
- p->next = NULL;
- }
- pr_debug("create_pbe_list(): initialized %d PBEs\n", num);
-}
-
-/**
- * alloc_pagedir - Allocate the page directory.
- *
- * First, determine exactly how many pages we need and
- * allocate them.
- *
- * We arrange the pages in a chain: each page is an array of PBES_PER_PAGE
- * struct pbe elements (pbes) and the last element in the page points
- * to the next page.
- *
- * On each page we set up a list of struct_pbe elements.
- */
-
-static struct pbe * alloc_pagedir(unsigned nr_pages)
-{
- unsigned num;
- struct pbe *pblist, *pbe;
-
- if (!nr_pages)
- return NULL;
-
- pr_debug("alloc_pagedir(): nr_pages = %d\n", nr_pages);
- pblist = (struct pbe *)get_zeroed_page(GFP_ATOMIC | __GFP_COLD);
- for (pbe = pblist, num = PBES_PER_PAGE; pbe && num < nr_pages;
- pbe = pbe->next, num += PBES_PER_PAGE) {
- pbe += PB_PAGE_SKIP;
- pbe->next = (struct pbe *)get_zeroed_page(GFP_ATOMIC | __GFP_COLD);
- }
- if (!pbe) { /* get_zeroed_page() failed */
- free_pagedir(pblist);
- pblist = NULL;
- }
- return pblist;
-}
-
-/**
- * free_image_pages - Free pages allocated for snapshot
- */
-
-static void free_image_pages(void)
-{
- struct pbe * p;
-
- for_each_pbe (p, pagedir_save) {
- if (p->address) {
- ClearPageNosave(virt_to_page(p->address));
- free_page(p->address);
- p->address = 0;
- }
- }
-}
-
-/**
- * alloc_image_pages - Allocate pages for the snapshot.
- */
-
-static int alloc_image_pages(void)
-{
- struct pbe * p;
-
- for_each_pbe (p, pagedir_save) {
- p->address = get_zeroed_page(GFP_ATOMIC | __GFP_COLD);
- if (!p->address)
- return -ENOMEM;
- SetPageNosave(virt_to_page(p->address));
- }
- return 0;
-}
-
-/* Free pages we allocated for suspend. Suspend pages are alocated
- * before atomic copy, so we need to free them after resume.
- */
-void swsusp_free(void)
-{
- BUG_ON(PageNosave(virt_to_page(pagedir_save)));
- BUG_ON(PageNosaveFree(virt_to_page(pagedir_save)));
- free_image_pages();
- free_pagedir(pagedir_save);
-}
-
-
-/**
- * enough_free_mem - Make sure we enough free memory to snapshot.
- *
- * Returns TRUE or FALSE after checking the number of available
- * free pages.
- */
-
-static int enough_free_mem(void)
-{
- if (nr_free_pages() < (nr_copy_pages + PAGES_FOR_IO)) {
- pr_debug("swsusp: Not enough free pages: Have %d\n",
- nr_free_pages());
- return 0;
- }
- return 1;
-}
-
-
/**
* enough_swap - Make sure we have enough swap to save the image.
*
@@ -902,87 +543,14 @@ static int enough_free_mem(void)
* We should only consider resume_device.
*/
-static int enough_swap(void)
+int enough_swap(unsigned nr_pages)
{
struct sysinfo i;
si_swapinfo(&i);
- if (i.freeswap < (nr_copy_pages + PAGES_FOR_IO)) {
- pr_debug("swsusp: Not enough swap. Need %ld\n",i.freeswap);
- return 0;
- }
- return 1;
-}
-
-static int swsusp_alloc(void)
-{
- int error;
-
- pagedir_nosave = NULL;
- nr_copy_pages = calc_nr(nr_copy_pages);
- nr_copy_pages_check = nr_copy_pages;
-
- pr_debug("suspend: (pages needed: %d + %d free: %d)\n",
- nr_copy_pages, PAGES_FOR_IO, nr_free_pages());
-
- if (!enough_free_mem())
- return -ENOMEM;
-
- if (!enough_swap())
- return -ENOSPC;
-
- if (MAX_PBES < nr_copy_pages / PBES_PER_PAGE +
- !!(nr_copy_pages % PBES_PER_PAGE))
- return -ENOSPC;
-
- if (!(pagedir_save = alloc_pagedir(nr_copy_pages))) {
- printk(KERN_ERR "suspend: Allocating pagedir failed.\n");
- return -ENOMEM;
- }
- create_pbe_list(pagedir_save, nr_copy_pages);
- pagedir_nosave = pagedir_save;
- if ((error = alloc_image_pages())) {
- printk(KERN_ERR "suspend: Allocating image pages failed.\n");
- swsusp_free();
- return error;
- }
-
- return 0;
-}
-
-static int suspend_prepare_image(void)
-{
- int error;
-
- pr_debug("swsusp: critical section: \n");
- if (save_highmem()) {
- printk(KERN_CRIT "Suspend machine: Not enough free pages for highmem\n");
- restore_highmem();
- return -ENOMEM;
- }
-
- drain_local_pages();
- count_data_pages();
- printk("swsusp: Need to copy %u pages\n", nr_copy_pages);
-
- error = swsusp_alloc();
- if (error)
- return error;
-
- /* During allocating of suspend pagedir, new cold pages may appear.
- * Kill them.
- */
- drain_local_pages();
- copy_data_pages();
-
- /*
- * End of critical section. From now on, we can write to memory,
- * but we should not touch disk. This specially means we must _not_
- * touch swap space! Except we must write out our image of course.
- */
-
- printk("swsusp: critical section/: done (%d pages copied)\n", nr_copy_pages );
- return 0;
+ pr_debug("swsusp: available swap: %lu pages\n", i.freeswap);
+ return i.freeswap > (nr_pages + PAGES_FOR_IO +
+ (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
}
@@ -994,7 +562,7 @@ static int suspend_prepare_image(void)
int swsusp_write(void)
{
int error;
- device_resume();
+
lock_swapdevices();
error = write_suspend_image();
/* This will unlock ignored swap devices since writing is finished */
@@ -1004,14 +572,6 @@ int swsusp_write(void)
}
-extern asmlinkage int swsusp_arch_suspend(void);
-extern asmlinkage int swsusp_arch_resume(void);
-
-
-asmlinkage int swsusp_save(void)
-{
- return suspend_prepare_image();
-}
int swsusp_suspend(void)
{
@@ -1043,7 +603,6 @@ int swsusp_suspend(void)
printk(KERN_ERR "Error %d suspending\n", error);
/* Restore control flow magically appears here */
restore_processor_state();
- BUG_ON (nr_copy_pages_check != nr_copy_pages);
restore_highmem();
device_power_up();
local_irq_enable();
@@ -1063,6 +622,11 @@ int swsusp_resume(void)
* execution continues at place where swsusp_arch_suspend was called
*/
BUG_ON(!error);
+ /* The only reason why swsusp_arch_resume() can fail is memory being
+ * very tight, so we have to free it as soon as we can to avoid
+ * subsequent failures
+ */
+ swsusp_free();
restore_processor_state();
restore_highmem();
touch_softlockup_watchdog();
@@ -1078,54 +642,28 @@ int swsusp_resume(void)
*
* We don't know which pages are usable until we allocate them.
*
- * Allocated but unusable (ie eaten) memory pages are linked together
- * to create a list, so that we can free them easily
- *
- * We could have used a type other than (void *)
- * for this purpose, but ...
+ * Allocated but unusable (ie eaten) memory pages are marked so that
+ * swsusp_free() can release them
*/
-static void **eaten_memory = NULL;
-
-static inline void eat_page(void *page)
-{
- void **c;
-
- c = eaten_memory;
- eaten_memory = page;
- *eaten_memory = c;
-}
-unsigned long get_usable_page(unsigned gfp_mask)
+unsigned long get_safe_page(gfp_t gfp_mask)
{
unsigned long m;
- m = get_zeroed_page(gfp_mask);
- while (!PageNosaveFree(virt_to_page(m))) {
- eat_page((void *)m);
+ do {
m = get_zeroed_page(gfp_mask);
- if (!m)
- break;
+ if (m && PageNosaveFree(virt_to_page(m)))
+ /* This is for swsusp_free() */
+ SetPageNosave(virt_to_page(m));
+ } while (m && PageNosaveFree(virt_to_page(m)));
+ if (m) {
+ /* This is for swsusp_free() */
+ SetPageNosave(virt_to_page(m));
+ SetPageNosaveFree(virt_to_page(m));
}
return m;
}
-void free_eaten_memory(void)
-{
- unsigned long m;
- void **c;
- int i = 0;
-
- c = eaten_memory;
- while (c) {
- m = (unsigned long)c;
- c = *c;
- free_page(m);
- i++;
- }
- eaten_memory = NULL;
- pr_debug("swsusp: %d unused pages freed\n", i);
-}
-
/**
* check_pagedir - We ensure here that pages that the PBEs point to
* won't collide with pages where we're going to restore from the loaded
@@ -1143,7 +681,7 @@ static int check_pagedir(struct pbe *pblist)
p->address = 0UL;
for_each_pbe (p, pblist) {
- p->address = get_usable_page(GFP_ATOMIC);
+ p->address = get_safe_page(GFP_ATOMIC);
if (!p->address)
return -ENOMEM;
}
@@ -1162,7 +700,7 @@ static struct pbe * swsusp_pagedir_relocate(struct pbe *pblist)
unsigned long zone_pfn;
struct pbe *pbpage, *tail, *p;
void *m;
- int rel = 0, error = 0;
+ int rel = 0;
if (!pblist) /* a sanity check */
return NULL;
@@ -1170,41 +708,37 @@ static struct pbe * swsusp_pagedir_relocate(struct pbe *pblist)
pr_debug("swsusp: Relocating pagedir (%lu pages to check)\n",
swsusp_info.pagedir_pages);
- /* Set page flags */
+ /* Clear page flags */
for_each_zone (zone) {
for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
- SetPageNosaveFree(pfn_to_page(zone_pfn +
+ if (pfn_valid(zone_pfn + zone->zone_start_pfn))
+ ClearPageNosaveFree(pfn_to_page(zone_pfn +
zone->zone_start_pfn));
}
- /* Clear orig addresses */
+ /* Mark orig addresses */
for_each_pbe (p, pblist)
- ClearPageNosaveFree(virt_to_page(p->orig_address));
+ SetPageNosaveFree(virt_to_page(p->orig_address));
tail = pblist + PB_PAGE_SKIP;
/* Relocate colliding pages */
for_each_pb_page (pbpage, pblist) {
- if (!PageNosaveFree(virt_to_page((unsigned long)pbpage))) {
- m = (void *)get_usable_page(GFP_ATOMIC | __GFP_COLD);
- if (!m) {
- error = -ENOMEM;
- break;
- }
+ if (PageNosaveFree(virt_to_page((unsigned long)pbpage))) {
+ m = (void *)get_safe_page(GFP_ATOMIC | __GFP_COLD);
+ if (!m)
+ return NULL;
memcpy(m, (void *)pbpage, PAGE_SIZE);
if (pbpage == pblist)
pblist = (struct pbe *)m;
else
tail->next = (struct pbe *)m;
-
- eat_page((void *)pbpage);
pbpage = (struct pbe *)m;
/* We have to link the PBEs again */
-
for (p = pbpage; p < pbpage + PB_PAGE_SKIP; p++)
if (p->next) /* needed to save the end */
p->next = p + 1;
@@ -1214,15 +748,13 @@ static struct pbe * swsusp_pagedir_relocate(struct pbe *pblist)
tail = pbpage + PB_PAGE_SKIP;
}
- if (error) {
- printk("\nswsusp: Out of memory\n\n");
- free_pagedir(pblist);
- free_eaten_memory();
- pblist = NULL;
- /* Is this even worth handling? It should never ever happen, and we
- have just lost user's state, anyway... */
- } else
- printk("swsusp: Relocated %d pages\n", rel);
+ /* This is for swsusp_free() */
+ for_each_pb_page (pbpage, pblist) {
+ SetPageNosave(virt_to_page(pbpage));
+ SetPageNosaveFree(virt_to_page(pbpage));
+ }
+
+ printk("swsusp: Relocated %d pages\n", rel);
return pblist;
}
@@ -1440,9 +972,7 @@ static int read_pagedir(struct pbe *pblist)
break;
}
- if (error)
- free_pagedir(pblist);
- else
+ if (!error)
BUG_ON(i != swsusp_info.pagedir_pages);
return error;
@@ -1485,15 +1015,6 @@ static int read_suspend_image(void)
if (!error)
error = data_read(pagedir_nosave);
- if (error) { /* We fail cleanly */
- free_eaten_memory();
- for_each_pbe (p, pagedir_nosave)
- if (p->address) {
- free_page(p->address);
- p->address = 0UL;
- }
- free_pagedir(pagedir_nosave);
- }
return error;
}