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Subject[swsusp] separate snapshot functionality to separate file
Split swsusp.c into swsusp.c and snapshot.c. Snapshot only cares
provides system snapshot/restore functionality, while swsusp.c will
provide disk i/o. It should enable untangling of the code in future;
swsusp.c parts can mostly be done in userspace.

No code changes.

Signed-off-by: Pavel Machek <pavel@suse.cz>

---
commit 747dfd4b9b6abd5df42d6a003cf4ab5dc36a4026
tree 6e6c3ed712122d1aafb6cadcc21fa077aed0fc82
parent f3dae2d929b7f33da6d9f8a70b9a80b705ed20c7
author <pavel@amd.(none)> Mon, 03 Oct 2005 00:45:49 +0200
committer <pavel@amd.(none)> Mon, 03 Oct 2005 00:45:49 +0200
include/linux/suspend.h | 6 +
kernel/power/Makefile | 2
kernel/power/power.h | 17 ++
kernel/power/snapshot.c | 464 +++++++++++++++++++++++++++++++++++++++++++++++
kernel/power/swsusp.c | 432 --------------------------------------------
5 files changed, 492 insertions(+), 429 deletions(-)
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -72,4 +72,10 @@ struct saved_context;
void __save_processor_state(struct saved_context *ctxt);
void __restore_processor_state(struct saved_context *ctxt);

+/*
+ * 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
+
#endif /* _LINUX_SWSUSP_H */
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
--- 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/power.h b/kernel/power/power.h
--- 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 void free_pagedir(struct pbe *pblist);
+extern struct pbe * alloc_pagedir(unsigned nr_pages);
+extern void create_pbe_list(struct pbe *pblist, unsigned nr_pages);
+extern int enough_swap(void);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
new file mode 100644
--- /dev/null
+++ b/kernel/power/snapshot.c
@@ -0,0 +1,464 @@
+/*
+ * linux/kernel/power/swsusp.c
+ *
+ * This file is to realize architecture-independent
+ * machine suspend feature using pretty near only high-level routines
+ *
+ * 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/file.h>
+#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>
+#include <linux/major.h>
+#include <linux/swap.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/buffer_head.h>
+#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>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/io.h>
+
+#include <linux/random.h>
+#include <linux/crypto.h>
+#include <asm/scatterlist.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;
+}
+#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;
+}
+
+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, *p;
+
+ 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);
+ /* This is necessary for swsusp_free() */
+ for_each_pb_page (p, pagedir_nosave)
+ SetPageNosaveFree(virt_to_page(p));
+ for_each_pbe(p, pagedir_nosave)
+ 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()
+ */
+
+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 = (struct pbe *)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 = (struct pbe *)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(void)
+{
+ pr_debug("swsusp: available memory: %u pages\n", nr_free_pages());
+ return nr_free_pages() > (nr_copy_pages + PAGES_FOR_IO +
+ nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE));
+}
+
+
+static int swsusp_alloc(void)
+{
+ struct pbe * p;
+
+ pagedir_nosave = NULL;
+
+ 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;
+
+ for_each_pbe (p, pagedir_save) {
+ p->address = (unsigned long)alloc_image_page();
+ if (!p->address) {
+ printk(KERN_ERR "suspend: Allocating image pages failed.\n");
+ swsusp_free();
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+static int suspend_prepare_image(void)
+{
+ int error;
+
+ 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();
+ count_data_pages();
+ printk("swsusp: Need to copy %u pages\n", nr_copy_pages);
+
+ pr_debug("swsusp: pages needed: %u + %u + %u, free: %u\n",
+ nr_copy_pages,
+ nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE),
+ PAGES_FOR_IO, nr_free_pages());
+
+ if (!enough_free_mem()) {
+ printk(KERN_ERR "swsusp: Not enough free memory\n");
+ return -ENOMEM;
+ }
+
+ if (!enough_swap()) {
+ printk(KERN_ERR "swsusp: Not enough free swap\n");
+ return -ENOSPC;
+ }
+
+ 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;
+}
+
+
+asmlinkage int swsusp_save(void)
+{
+ return suspend_prepare_image();
+}
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -5,7 +5,7 @@
* machine suspend feature using pretty near only high-level routines
*
* 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.
*
@@ -84,16 +84,10 @@
#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 +103,7 @@ static unsigned int nr_copy_pages __nosa
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 +118,6 @@ 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...
*/

@@ -553,328 +541,6 @@ static int write_suspend_image(void)
}


-#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, *p;
-
- 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);
- /* This is necessary for swsusp_free() */
- for_each_pb_page (p, pagedir_nosave)
- SetPageNosaveFree(virt_to_page(p));
- for_each_pbe(p, pagedir_nosave)
- 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 inline 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()
- */
-
-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);
-}
-
-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.
- */
-
-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 *)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 = (struct pbe *)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(void)
-{
- pr_debug("swsusp: available memory: %u pages\n", nr_free_pages());
- return nr_free_pages() > (nr_copy_pages + PAGES_FOR_IO +
- nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE));
-}
-
-
/**
* enough_swap - Make sure we have enough swap to save the image.
*
@@ -885,7 +551,7 @@ static int enough_free_mem(void)
* We should only consider resume_device.
*/

-static int enough_swap(void)
+int enough_swap(void)
{
struct sysinfo i;

@@ -895,87 +561,6 @@ static int enough_swap(void)
nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE));
}

-static int swsusp_alloc(void)
-{
- struct pbe * p;
-
- pagedir_nosave = NULL;
-
- 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;
-
- for_each_pbe (p, pagedir_save) {
- p->address = (unsigned long)alloc_image_page();
- if (!p->address) {
- printk(KERN_ERR "suspend: Allocating image pages failed.\n");
- swsusp_free();
- return -ENOMEM;
- }
- }
-
- return 0;
-}
-
-static int suspend_prepare_image(void)
-{
- int error;
-
- 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();
- count_data_pages();
- printk("swsusp: Need to copy %u pages\n", nr_copy_pages);
- nr_copy_pages_check = nr_copy_pages;
-
- pr_debug("swsusp: pages needed: %u + %u + %u, free: %u\n",
- nr_copy_pages,
- nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE),
- PAGES_FOR_IO, nr_free_pages());
-
- if (!enough_free_mem()) {
- printk(KERN_ERR "swsusp: Not enough free memory\n");
- return -ENOMEM;
- }
-
- if (!enough_swap()) {
- printk(KERN_ERR "swsusp: Not enough free swap\n");
- return -ENOSPC;
- }
-
- 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;
-}
-
-
/* It is important _NOT_ to umount filesystems at this point. We want
* them synced (in case something goes wrong) but we DO not want to mark
* filesystem clean: it is not. (And it does not matter, if we resume
@@ -994,14 +579,6 @@ 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)
{
@@ -1033,7 +610,6 @@ 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();
--
if you have sharp zaurus hardware you don't need... you know my address
-
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