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-rw-r--r--kernel/power/Kconfig11
-rw-r--r--kernel/power/disk.c77
-rw-r--r--kernel/power/main.c29
-rw-r--r--kernel/power/power.h49
-rw-r--r--kernel/power/process.c6
-rw-r--r--kernel/power/snapshot.c309
-rw-r--r--kernel/power/swap.c60
-rw-r--r--kernel/power/swsusp.c139
-rw-r--r--kernel/power/user.c39
9 files changed, 491 insertions, 228 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 5001c652028..495b7d4dd33 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -78,17 +78,22 @@ config PM_SYSFS_DEPRECATED
are likely to be bus or driver specific.
config SOFTWARE_SUSPEND
- bool "Software Suspend"
+ bool "Software Suspend (Hibernation)"
depends on PM && SWAP && (((X86 || PPC64_SWSUSP) && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP))
---help---
- Enable the suspend to disk (STD) functionality.
+ Enable the suspend to disk (STD) functionality, which is usually
+ called "hibernation" in user interfaces. STD checkpoints the
+ system and powers it off; and restores that checkpoint on reboot.
You can suspend your machine with 'echo disk > /sys/power/state'.
Alternatively, you can use the additional userland tools available
from <http://suspend.sf.net>.
In principle it does not require ACPI or APM, although for example
- ACPI will be used if available.
+ ACPI will be used for the final steps when it is available. One
+ of the reasons to use software suspend is that the firmware hooks
+ for suspend states like suspend-to-RAM (STR) often don't work very
+ well with Linux.
It creates an image which is saved in your active swap. Upon the next
boot, pass the 'resume=/dev/swappartition' argument to the kernel to
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 02e4fb69111..06331374d86 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -130,15 +130,25 @@ int pm_suspend_disk(void)
{
int error;
+ /* The snapshot device should not be opened while we're running */
+ if (!atomic_add_unless(&snapshot_device_available, -1, 0))
+ return -EBUSY;
+
+ /* Allocate memory management structures */
+ error = create_basic_memory_bitmaps();
+ if (error)
+ goto Exit;
+
error = prepare_processes();
if (error)
- return error;
+ goto Finish;
if (pm_disk_mode == PM_DISK_TESTPROC) {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
goto Thaw;
}
+
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
if (error)
@@ -196,6 +206,10 @@ int pm_suspend_disk(void)
resume_console();
Thaw:
unprepare_processes();
+ Finish:
+ free_basic_memory_bitmaps();
+ Exit:
+ atomic_inc(&snapshot_device_available);
return error;
}
@@ -239,13 +253,21 @@ static int software_resume(void)
}
pr_debug("PM: Checking swsusp image.\n");
-
error = swsusp_check();
if (error)
- goto Done;
+ goto Unlock;
- pr_debug("PM: Preparing processes for restore.\n");
+ /* The snapshot device should not be opened while we're running */
+ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
+ error = -EBUSY;
+ goto Unlock;
+ }
+ error = create_basic_memory_bitmaps();
+ if (error)
+ goto Finish;
+
+ pr_debug("PM: Preparing processes for restore.\n");
error = prepare_processes();
if (error) {
swsusp_close();
@@ -280,7 +302,11 @@ static int software_resume(void)
printk(KERN_ERR "PM: Restore failed, recovering.\n");
unprepare_processes();
Done:
+ free_basic_memory_bitmaps();
+ Finish:
+ atomic_inc(&snapshot_device_available);
/* For success case, the suspend path will release the lock */
+ Unlock:
mutex_unlock(&pm_mutex);
pr_debug("PM: Resume from disk failed.\n");
return 0;
@@ -322,13 +348,40 @@ static const char * const pm_disk_modes[] = {
* supports it (as determined from pm_ops->pm_disk_mode).
*/
-static ssize_t disk_show(struct subsystem * subsys, char * buf)
+static ssize_t disk_show(struct kset *kset, char *buf)
{
- return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
+ int i;
+ char *start = buf;
+
+ for (i = PM_DISK_PLATFORM; i < PM_DISK_MAX; i++) {
+ if (!pm_disk_modes[i])
+ continue;
+ switch (i) {
+ case PM_DISK_SHUTDOWN:
+ case PM_DISK_REBOOT:
+ case PM_DISK_TEST:
+ case PM_DISK_TESTPROC:
+ break;
+ default:
+ if (pm_ops && pm_ops->enter &&
+ (i == pm_ops->pm_disk_mode))
+ break;
+ /* not a valid mode, continue with loop */
+ continue;
+ }
+ if (i == pm_disk_mode)
+ buf += sprintf(buf, "[%s]", pm_disk_modes[i]);
+ else
+ buf += sprintf(buf, "%s", pm_disk_modes[i]);
+ if (i+1 != PM_DISK_MAX)
+ buf += sprintf(buf, " ");
+ }
+ buf += sprintf(buf, "\n");
+ return buf-start;
}
-static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
+static ssize_t disk_store(struct kset *kset, const char *buf, size_t n)
{
int error = 0;
int i;
@@ -373,13 +426,13 @@ static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
power_attr(disk);
-static ssize_t resume_show(struct subsystem * subsys, char *buf)
+static ssize_t resume_show(struct kset *kset, char *buf)
{
return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
MINOR(swsusp_resume_device));
}
-static ssize_t resume_store(struct subsystem *subsys, const char *buf, size_t n)
+static ssize_t resume_store(struct kset *kset, const char *buf, size_t n)
{
unsigned int maj, min;
dev_t res;
@@ -405,12 +458,12 @@ static ssize_t resume_store(struct subsystem *subsys, const char *buf, size_t n)
power_attr(resume);
-static ssize_t image_size_show(struct subsystem * subsys, char *buf)
+static ssize_t image_size_show(struct kset *kset, char *buf)
{
return sprintf(buf, "%lu\n", image_size);
}
-static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n)
+static ssize_t image_size_store(struct kset *kset, const char *buf, size_t n)
{
unsigned long size;
@@ -439,7 +492,7 @@ static struct attribute_group attr_group = {
static int __init pm_disk_init(void)
{
- return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
+ return sysfs_create_group(&power_subsys.kobj, &attr_group);
}
core_initcall(pm_disk_init);
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 72419a3b1be..f6dda685e7e 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -184,17 +184,21 @@ static void suspend_finish(suspend_state_t state)
static const char * const pm_states[PM_SUSPEND_MAX] = {
[PM_SUSPEND_STANDBY] = "standby",
[PM_SUSPEND_MEM] = "mem",
-#ifdef CONFIG_SOFTWARE_SUSPEND
[PM_SUSPEND_DISK] = "disk",
-#endif
};
static inline int valid_state(suspend_state_t state)
{
/* Suspend-to-disk does not really need low-level support.
- * It can work with reboot if needed. */
+ * It can work with shutdown/reboot if needed. If it isn't
+ * configured, then it cannot be supported.
+ */
if (state == PM_SUSPEND_DISK)
+#ifdef CONFIG_SOFTWARE_SUSPEND
return 1;
+#else
+ return 0;
+#endif
/* all other states need lowlevel support and need to be
* valid to the lowlevel implementation, no valid callback
@@ -244,15 +248,6 @@ static int enter_state(suspend_state_t state)
return error;
}
-/*
- * This is main interface to the outside world. It needs to be
- * called from process context.
- */
-int software_suspend(void)
-{
- return enter_state(PM_SUSPEND_DISK);
-}
-
/**
* pm_suspend - Externally visible function for suspending system.
@@ -285,7 +280,7 @@ decl_subsys(power,NULL,NULL);
* proper enumerated value, and initiates a suspend transition.
*/
-static ssize_t state_show(struct subsystem * subsys, char * buf)
+static ssize_t state_show(struct kset *kset, char *buf)
{
int i;
char * s = buf;
@@ -298,7 +293,7 @@ static ssize_t state_show(struct subsystem * subsys, char * buf)
return (s - buf);
}
-static ssize_t state_store(struct subsystem * subsys, const char * buf, size_t n)
+static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
{
suspend_state_t state = PM_SUSPEND_STANDBY;
const char * const *s;
@@ -325,13 +320,13 @@ power_attr(state);
#ifdef CONFIG_PM_TRACE
int pm_trace_enabled;
-static ssize_t pm_trace_show(struct subsystem * subsys, char * buf)
+static ssize_t pm_trace_show(struct kset *kset, char *buf)
{
return sprintf(buf, "%d\n", pm_trace_enabled);
}
static ssize_t
-pm_trace_store(struct subsystem * subsys, const char * buf, size_t n)
+pm_trace_store(struct kset *kset, const char *buf, size_t n)
{
int val;
@@ -365,7 +360,7 @@ static int __init pm_init(void)
{
int error = subsystem_register(&power_subsys);
if (!error)
- error = sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
+ error = sysfs_create_group(&power_subsys.kobj,&attr_group);
return error;
}
diff --git a/kernel/power/power.h b/kernel/power/power.h
index eb461b816bf..34b43542785 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -14,8 +14,18 @@ struct swsusp_info {
#ifdef CONFIG_SOFTWARE_SUSPEND
-extern int pm_suspend_disk(void);
+/*
+ * Keep some memory free so that I/O operations can succeed without paging
+ * [Might this be more than 4 MB?]
+ */
+#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
+/*
+ * Keep 1 MB of memory free so that device drivers can allocate some pages in
+ * their .suspend() routines without breaking the suspend to disk.
+ */
+#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
+extern int pm_suspend_disk(void);
#else
static inline int pm_suspend_disk(void)
{
@@ -23,6 +33,8 @@ static inline int pm_suspend_disk(void)
}
#endif
+extern int pfn_is_nosave(unsigned long);
+
extern struct mutex pm_mutex;
#define power_attr(_name) \
@@ -35,10 +47,7 @@ static struct subsys_attribute _name##_attr = { \
.store = _name##_store, \
}
-extern struct subsystem power_subsys;
-
-/* References to section boundaries */
-extern const void __nosave_begin, __nosave_end;
+extern struct kset power_subsys;
/* Preferred image size in bytes (default 500 MB) */
extern unsigned long image_size;
@@ -49,6 +58,8 @@ extern sector_t swsusp_resume_block;
extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);
+extern int create_basic_memory_bitmaps(void);
+extern void free_basic_memory_bitmaps(void);
extern unsigned int count_data_pages(void);
/**
@@ -139,30 +150,12 @@ struct resume_swap_area {
#define PMOPS_ENTER 2
#define PMOPS_FINISH 3
-/**
- * The bitmap is used for tracing allocated swap pages
- *
- * The entire bitmap consists of a number of bitmap_page
- * structures linked with the help of the .next member.
- * Thus each page can be allocated individually, so we only
- * need to make 0-order memory allocations to create
- * the bitmap.
- */
-
-#define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *))
-#define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long))
-#define BITS_PER_CHUNK (sizeof(long) * 8)
-#define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
-
-struct bitmap_page {
- unsigned long chunks[BITMAP_PAGE_CHUNKS];
- struct bitmap_page *next;
-};
+/* If unset, the snapshot device cannot be open. */
+extern atomic_t snapshot_device_available;
-extern void free_bitmap(struct bitmap_page *bitmap);
-extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
-extern sector_t alloc_swapdev_block(int swap, struct bitmap_page *bitmap);
-extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
+extern sector_t alloc_swapdev_block(int swap);
+extern void free_all_swap_pages(int swap);
+extern int swsusp_swap_in_use(void);
extern int swsusp_check(void);
extern int swsusp_shrink_memory(void);
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 6d566bf7085..0eb5c420e8e 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -47,8 +47,10 @@ void refrigerator(void)
recalc_sigpending(); /* We sent fake signal, clean it up */
spin_unlock_irq(&current->sighand->siglock);
- while (frozen(current)) {
- current->state = TASK_UNINTERRUPTIBLE;
+ for (;;) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (!frozen(current))
+ break;
schedule();
}
pr_debug("%s left refrigerator\n", current->comm);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index fc53ad06812..128da11f01c 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/pm.h>
#include <linux/device.h>
+#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/syscalls.h>
#include <linux/console.h>
@@ -34,6 +35,10 @@
#include "power.h"
+static int swsusp_page_is_free(struct page *);
+static void swsusp_set_page_forbidden(struct page *);
+static void swsusp_unset_page_forbidden(struct page *);
+
/* List of PBEs needed for restoring the pages that were allocated before
* the suspend and included in the suspend image, but have also been
* allocated by the "resume" kernel, so their contents cannot be written
@@ -67,15 +72,15 @@ static void *get_image_page(gfp_t gfp_mask, int safe_needed)
res = (void *)get_zeroed_page(gfp_mask);
if (safe_needed)
- while (res && PageNosaveFree(virt_to_page(res))) {
+ while (res && swsusp_page_is_free(virt_to_page(res))) {
/* The page is unsafe, mark it for swsusp_free() */
- SetPageNosave(virt_to_page(res));
+ swsusp_set_page_forbidden(virt_to_page(res));
allocated_unsafe_pages++;
res = (void *)get_zeroed_page(gfp_mask);
}
if (res) {
- SetPageNosave(virt_to_page(res));
- SetPageNosaveFree(virt_to_page(res));
+ swsusp_set_page_forbidden(virt_to_page(res));
+ swsusp_set_page_free(virt_to_page(res));
}
return res;
}
@@ -91,8 +96,8 @@ static struct page *alloc_image_page(gfp_t gfp_mask)
page = alloc_page(gfp_mask);
if (page) {
- SetPageNosave(page);
- SetPageNosaveFree(page);
+ swsusp_set_page_forbidden(page);
+ swsusp_set_page_free(page);
}
return page;
}
@@ -110,9 +115,9 @@ static inline void free_image_page(void *addr, int clear_nosave_free)
page = virt_to_page(addr);
- ClearPageNosave(page);
+ swsusp_unset_page_forbidden(page);
if (clear_nosave_free)
- ClearPageNosaveFree(page);
+ swsusp_unset_page_free(page);
__free_page(page);
}
@@ -224,11 +229,6 @@ static void chain_free(struct chain_allocator *ca, int clear_page_nosave)
* of type unsigned long each). It also contains the pfns that
* correspond to the start and end of the represented memory area and
* the number of bit chunks in the block.
- *
- * NOTE: Memory bitmaps are used for two types of operations only:
- * "set a bit" and "find the next bit set". Moreover, the searching
- * is always carried out after all of the "set a bit" operations
- * on given bitmap.
*/
#define BM_END_OF_MAP (~0UL)
@@ -443,15 +443,13 @@ static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free)
}
/**
- * memory_bm_set_bit - set the bit in the bitmap @bm that corresponds
+ * memory_bm_find_bit - find the bit in the bitmap @bm that corresponds
* to given pfn. The cur_zone_bm member of @bm and the cur_block member
* of @bm->cur_zone_bm are updated.
- *
- * If the bit cannot be set, the function returns -EINVAL .
*/
-static int
-memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn)
+static void memory_bm_find_bit(struct memory_bitmap *bm, unsigned long pfn,
+ void **addr, unsigned int *bit_nr)
{
struct zone_bitmap *zone_bm;
struct bm_block *bb;
@@ -463,8 +461,8 @@ memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn)
/* We don't assume that the zones are sorted by pfns */
while (pfn < zone_bm->start_pfn || pfn >= zone_bm->end_pfn) {
zone_bm = zone_bm->next;
- if (unlikely(!zone_bm))
- return -EINVAL;
+
+ BUG_ON(!zone_bm);
}
bm->cur.zone_bm = zone_bm;
}
@@ -475,13 +473,40 @@ memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn)
while (pfn >= bb->end_pfn) {
bb = bb->next;
- if (unlikely(!bb))
- return -EINVAL;
+
+ BUG_ON(!bb);
}
zone_bm->cur_block = bb;
pfn -= bb->start_pfn;
- set_bit(pfn % BM_BITS_PER_CHUNK, bb->data + pfn / BM_BITS_PER_CHUNK);
- return 0;
+ *bit_nr = pfn % BM_BITS_PER_CHUNK;
+ *addr = bb->data + pfn / BM_BITS_PER_CHUNK;
+}
+
+static void memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn)
+{
+ void *addr;
+ unsigned int bit;
+
+ memory_bm_find_bit(bm, pfn, &addr, &bit);
+ set_bit(bit, addr);
+}
+
+static void memory_bm_clear_bit(struct memory_bitmap *bm, unsigned long pfn)
+{
+ void *addr;
+ unsigned int bit;
+
+ memory_bm_find_bit(bm, pfn, &addr, &bit);
+ clear_bit(bit, addr);
+}
+
+static int memory_bm_test_bit(struct memory_bitmap *bm, unsigned long pfn)
+{
+ void *addr;
+ unsigned int bit;
+
+ memory_bm_find_bit(bm, pfn, &addr, &bit);
+ return test_bit(bit, addr);
}
/* Two auxiliary functions for memory_bm_next_pfn */
@@ -564,6 +589,199 @@ static unsigned long memory_bm_next_pfn(struct memory_bitmap *bm)
}
/**
+ * This structure represents a range of page frames the contents of which
+ * should not be saved during the suspend.
+ */
+
+struct nosave_region {
+ struct list_head list;
+ unsigned long start_pfn;
+ unsigned long end_pfn;
+};
+
+static LIST_HEAD(nosave_regions);
+
+/**
+ * register_nosave_region - register a range of page frames the contents
+ * of which should not be saved during the suspend (to be used in the early
+ * initialization code)
+ */
+
+void __init
+register_nosave_region(unsigned long start_pfn, unsigned long end_pfn)
+{
+ struct nosave_region *region;
+
+ if (start_pfn >= end_pfn)
+ return;
+
+ if (!list_empty(&nosave_regions)) {
+ /* Try to extend the previous region (they should be sorted) */
+ region = list_entry(nosave_regions.prev,
+ struct nosave_region, list);
+ if (region->end_pfn == start_pfn) {
+ region->end_pfn = end_pfn;
+ goto Report;
+ }
+ }
+ /* This allocation cannot fail */
+ region = alloc_bootmem_low(sizeof(struct nosave_region));
+ region->start_pfn = start_pfn;
+ region->end_pfn = end_pfn;
+ list_add_tail(&region->list, &nosave_regions);
+ Report:
+ printk("swsusp: Registered nosave memory region: %016lx - %016lx\n",
+ start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
+}
+
+/*
+ * Set bits in this map correspond to the page frames the contents of which
+ * should not be saved during the suspend.
+ */
+static struct memory_bitmap *forbidden_pages_map;
+
+/* Set bits in this map correspond to free page frames. */
+static struct memory_bitmap *free_pages_map;
+
+/*
+ * Each page frame allocated for creating the image is marked by setting the
+ * corresponding bits in forbidden_pages_map and free_pages_map simultaneously
+ */
+
+void swsusp_set_page_free(struct page *page)
+{
+ if (free_pages_map)
+ memory_bm_set_bit(free_pages_map, page_to_pfn(page));
+}
+
+static int swsusp_page_is_free(struct page *page)
+{
+ return free_pages_map ?
+ memory_bm_test_bit(free_pages_map, page_to_pfn(page)) : 0;
+}
+
+void swsusp_unset_page_free(struct page *page)
+{
+ if (free_pages_map)
+ memory_bm_clear_bit(free_pages_map, page_to_pfn(page));
+}
+
+static void swsusp_set_page_forbidden(struct page *page)
+{
+ if (forbidden_pages_map)
+ memory_bm_set_bit(forbidden_pages_map, page_to_pfn(page));
+}
+
+int swsusp_page_is_forbidden(struct page *page)
+{
+ return forbidden_pages_map ?
+ memory_bm_test_bit(forbidden_pages_map, page_to_pfn(page)) : 0;
+}
+
+static void swsusp_unset_page_forbidden(struct page *page)
+{
+ if (forbidden_pages_map)
+ memory_bm_clear_bit(forbidden_pages_map, page_to_pfn(page));
+}
+
+/**
+ * mark_nosave_pages - set bits corresponding to the page frames the
+ * contents of which should not be saved in a given bitmap.
+ */
+
+static void mark_nosave_pages(struct memory_bitmap *bm)
+{
+ struct nosave_region *region;
+
+ if (list_empty(&nosave_regions))
+ return;
+
+ list_for_each_entry(region, &nosave_regions, list) {
+ unsigned long pfn;
+
+ printk("swsusp: Marking nosave pages: %016lx - %016lx\n",
+ region->start_pfn << PAGE_SHIFT,
+ region->end_pfn << PAGE_SHIFT);
+
+ for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++)
+ memory_bm_set_bit(bm, pfn);
+ }
+}
+
+/**
+ * create_basic_memory_bitmaps - create bitmaps needed for marking page
+ * frames that should not be saved and free page frames. The pointers
+ * forbidden_pages_map and free_pages_map are only modified if everything
+ * goes well, because we don't want the bits to be used before both bitmaps
+ * are set up.
+ */
+
+int create_basic_memory_bitmaps(void)
+{
+ struct memory_bitmap *bm1, *bm2;
+ int error = 0;
+
+ BUG_ON(forbidden_pages_map || free_pages_map);
+
+ bm1 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL);
+ if (!bm1)
+ return -ENOMEM;
+
+ error = memory_bm_create(bm1, GFP_KERNEL, PG_ANY);
+ if (error)
+ goto Free_first_object;
+
+ bm2 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL);
+ if (!bm2)
+ goto Free_first_bitmap;
+
+ error = memory_bm_create(bm2, GFP_KERNEL, PG_ANY);
+ if (error)
+ goto Free_second_object;
+
+ forbidden_pages_map = bm1;
+ free_pages_map = bm2;
+ mark_nosave_pages(forbidden_pages_map);
+
+ printk("swsusp: Basic memory bitmaps created\n");
+
+ return 0;
+
+ Free_second_object:
+ kfree(bm2);
+ Free_first_bitmap:
+ memory_bm_free(bm1, PG_UNSAFE_CLEAR);
+ Free_first_object:
+ kfree(bm1);
+ return -ENOMEM;
+}
+
+/**
+ * free_basic_memory_bitmaps - free memory bitmaps allocated by
+ * create_basic_memory_bitmaps(). The auxiliary pointers are necessary
+ * so that the bitmaps themselves are not referred to while they are being
+ * freed.
+ */
+
+void free_basic_memory_bitmaps(void)
+{
+ struct memory_bitmap *bm1, *bm2;
+
+ BUG_ON(!(forbidden_pages_map && free_pages_map));
+
+ bm1 = forbidden_pages_map;
+ bm2 = free_pages_map;
+ forbidden_pages_map = NULL;
+ free_pages_map = NULL;
+ memory_bm_free(bm1, PG_UNSAFE_CLEAR);
+ kfree(bm1);
+ memory_bm_free(bm2, PG_UNSAFE_CLEAR);
+ kfree(bm2);
+
+ printk("swsusp: Basic memory bitmaps freed\n");
+}
+
+/**
* snapshot_additional_pages - estimate the number of additional pages
* be needed for setting up the suspend image data structures for given
* zone (usually the returned value is greater than the exact number)
@@ -615,7 +833,8 @@ static struct page *saveable_highmem_page(unsigned long pfn)
BUG_ON(!PageHighMem(page));
- if (PageNosave(page) || PageReserved(page) || PageNosaveFree(page))
+ if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page) ||
+ PageReserved(page))
return NULL;
return page;
@@ -651,17 +870,6 @@ static inline unsigned int count_highmem_pages(void) { return 0; }
#endif /* CONFIG_HIGHMEM */
/**
- * pfn_is_nosave - check if given pfn is in the 'nosave' section
- */
-
-static inline 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 non-highmem page should be included in
* the suspend image.
*
@@ -681,7 +889,7 @@ static struct page *saveable_page(unsigned long pfn)
BUG_ON(PageHighMem(page));
- if (PageNosave(page) || PageNosaveFree(page))
+ if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page))
return NULL;
if (PageReserved(page) && pfn_is_nosave(pfn))
@@ -821,9 +1029,10 @@ void swsusp_free(void)
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
- if (PageNosave(page) && PageNosaveFree(page)) {
- ClearPageNosave(page);
- ClearPageNosaveFree(page);
+ if (swsusp_page_is_forbidden(page) &&
+ swsusp_page_is_free(page)) {
+ swsusp_unset_page_forbidden(page);
+ swsusp_unset_page_free(page);
__free_page(page);
}
}
@@ -1146,7 +1355,7 @@ static int mark_unsafe_pages(struct memory_bitmap *bm)
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));
+ swsusp_unset_page_free(pfn_to_page(pfn));
}
/* Mark pages that correspond to the "original" pfns as "unsafe" */
@@ -1155,7 +1364,7 @@ static int mark_unsafe_pages(struct memory_bitmap *bm)
pfn = memory_bm_next_pfn(bm);
if (likely(pfn != BM_END_OF_MAP)) {
if (likely(pfn_valid(pfn)))
- SetPageNosaveFree(pfn_to_page(pfn));
+ swsusp_set_page_free(pfn_to_page(pfn));
else
return -EFAULT;
}
@@ -1321,14 +1530,14 @@ prepare_highmem_image(struct memory_bitmap *bm, unsigned int *nr_highmem_p)
struct page *page;
page = alloc_page(__GFP_HIGHMEM);
- if (!PageNosaveFree(page)) {
+ if (!swsusp_page_is_free(page)) {
/* The page is "safe", set its bit the bitmap */
memory_bm_set_bit(bm, page_to_pfn(page));
safe_highmem_pages++;
}
/* Mark the page as allocated */
- SetPageNosave(page);
- SetPageNosaveFree(page);
+ swsusp_set_page_forbidden(page);
+ swsusp_set_page_free(page);
}
memory_bm_position_reset(bm);
safe_highmem_bm = bm;
@@ -1360,7 +1569,7 @@ get_highmem_page_buffer(struct page *page, struct chain_allocator *ca)
struct highmem_pbe *pbe;
void *kaddr;
- if (PageNosave(page) && PageNosaveFree(page)) {
+ if (swsusp_page_is_forbidden(page) && swsusp_page_is_free(page)) {
/* We have allocated the "original" page frame and we can
* use it directly to store the loaded page.
*/
@@ -1522,14 +1731,14 @@ prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm)
error = -ENOMEM;
goto Free;
}
- if (!PageNosaveFree(virt_to_page(lp))) {
+ if (!swsusp_page_is_free(virt_to_page(lp))) {
/* The page is "safe", add it to the list */
lp->next = safe_pages_list;
safe_pages_list = lp;
}
/* Mark the page as allocated */
- SetPageNosave(virt_to_page(lp));
- SetPageNosaveFree(virt_to_page(lp));
+ swsusp_set_page_forbidden(virt_to_page(lp));
+ swsusp_set_page_free(virt_to_page(lp));
nr_pages--;
}
/* Free the reserved safe pages so that chain_alloc() can use them */
@@ -1558,7 +1767,7 @@ static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca)
if (PageHighMem(page))
return get_highmem_page_buffer(page, ca);
- if (PageNosave(page) && PageNosaveFree(page))
+ if (swsusp_page_is_forbidden(page) && swsusp_page_is_free(page))
/* We have allocated the "original" page frame and we can
* use it directly to store the loaded page.
*/
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 3581f8f86ac..e83ed9945a8 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -33,12 +33,14 @@ extern char resume_file[];
#define SWSUSP_SIG "S1SUSPEND"
-static struct swsusp_header {
+struct swsusp_header {
char reserved[PAGE_SIZE - 20 - sizeof(sector_t)];
sector_t image;
char orig_sig[10];
char sig[10];
-} __attribute__((packed, aligned(PAGE_SIZE))) swsusp_header;
+} __attribute__((packed));
+
+static struct swsusp_header *swsusp_header;
/*
* General things
@@ -141,14 +143,14 @@ static int mark_swapfiles(sector_t start)
{
int error;
- bio_read_page(swsusp_resume_block, &swsusp_header, NULL);
- if (!memcmp("SWAP-SPACE",swsusp_header.sig, 10) ||
- !memcmp("SWAPSPACE2",swsusp_header.sig, 10)) {
- memcpy(swsusp_header.orig_sig,swsusp_header.sig, 10);
- memcpy(swsusp_header.sig,SWSUSP_SIG, 10);
- swsusp_header.image = start;
+ bio_read_page(swsusp_resume_block, swsusp_header, NULL);
+ if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
+ !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
+ memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
+ memcpy(swsusp_header->sig,SWSUSP_SIG, 10);
+ swsusp_header->image = start;
error = bio_write_page(swsusp_resume_block,
- &swsusp_header, NULL);
+ swsusp_header, NULL);
} else {
printk(KERN_ERR "swsusp: Swap header not found!\n");
error = -ENODEV;
@@ -241,7 +243,6 @@ struct swap_map_page {
struct swap_map_handle {
struct swap_map_page *cur;
sector_t cur_swap;
- struct bitmap_page *bitmap;
unsigned int k;
};
@@ -250,9 +251,6 @@ static void release_swap_writer(struct swap_map_handle *handle)
if (handle->cur)
free_page((unsigned long)handle->cur);
handle->cur = NULL;
- if (handle->bitmap)
- free_bitmap(handle->bitmap);
- handle->bitmap = NULL;
}
static int get_swap_writer(struct swap_map_handle *handle)
@@ -260,12 +258,7 @@ static int get_swap_writer(struct swap_map_handle *handle)
handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
if (!handle->cur)
return -ENOMEM;
- handle->bitmap = alloc_bitmap(count_swap_pages(root_swap, 0));
- if (!handle->bitmap) {
- release_swap_writer(handle);
- return -ENOMEM;
- }
- handle->cur_swap = alloc_swapdev_block(root_swap, handle->bitmap);
+ handle->cur_swap = alloc_swapdev_block(root_swap);
if (!handle->cur_swap) {
release_swap_writer(handle);
return -ENOSPC;
@@ -282,7 +275,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
if (!handle->cur)
return -EINVAL;
- offset = alloc_swapdev_block(root_swap, handle->bitmap);
+ offset = alloc_swapdev_block(root_swap);
error = write_page(buf, offset, bio_chain);
if (error)
return error;
@@ -291,7 +284,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
error = wait_on_bio_chain(bio_chain);
if (error)
goto out;
- offset = alloc_swapdev_block(root_swap, handle->bitmap);
+ offset = alloc_swapdev_block(root_swap);
if (!offset)
return -ENOSPC;
handle->cur->next_swap = offset;
@@ -428,7 +421,8 @@ int swsusp_write(void)
}
}
if (error)
- free_all_swap_pages(root_swap, handle.bitmap);
+ free_all_swap_pages(root_swap);
+
release_swap_writer(&handle);
out:
swsusp_close();
@@ -564,7 +558,7 @@ int swsusp_read(void)
if (error < PAGE_SIZE)
return error < 0 ? error : -EFAULT;
header = (struct swsusp_info *)data_of(snapshot);
- error = get_swap_reader(&handle, swsusp_header.image);
+ error = get_swap_reader(&handle, swsusp_header->image);
if (!error)
error = swap_read_page(&handle, header, NULL);
if (!error)
@@ -591,17 +585,17 @@ int swsusp_check(void)
resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
if (!IS_ERR(resume_bdev)) {
set_blocksize(resume_bdev, PAGE_SIZE);
- memset(&swsusp_header, 0, sizeof(swsusp_header));
+ memset(swsusp_header, 0, sizeof(PAGE_SIZE));
error = bio_read_page(swsusp_resume_block,
- &swsusp_header, NULL);
+ swsusp_header, NULL);
if (error)
return error;
- if (!memcmp(SWSUSP_SIG, swsusp_header.sig, 10)) {
- memcpy(swsusp_header.sig, swsusp_header.orig_sig, 10);
+ if (!memcmp(SWSUSP_SIG, swsusp_header->sig, 10)) {
+ memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
/* Reset swap signature now */
error = bio_write_page(swsusp_resume_block,
- &swsusp_header, NULL);
+ swsusp_header, NULL);
} else {
return -EINVAL;
}
@@ -632,3 +626,13 @@ void swsusp_close(void)
blkdev_put(resume_bdev);
}
+
+static int swsusp_header_init(void)
+{
+ swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL);
+ if (!swsusp_header)
+ panic("Could not allocate memory for swsusp_header\n");
+ return 0;
+}
+
+core_initcall(swsusp_header_init);
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 175370824f3..5da304c8f1f 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -50,6 +50,7 @@
#include <linux/syscalls.h>
#include <linux/highmem.h>
#include <linux/time.h>
+#include <linux/rbtree.h>
#include "power.h"
@@ -74,72 +75,69 @@ static inline unsigned int count_highmem_pages(void) { return 0; }
/**
* The following functions are used for tracing the allocated
* swap pages, so that they can be freed in case of an error.
- *
- * The functions operate on a linked bitmap structure defined
- * in power.h
*/
-void free_bitmap(struct bitmap_page *bitmap)
-{
- struct bitmap_page *bp;
+struct swsusp_extent {
+ struct rb_node node;
+ unsigned long start;
+ unsigned long end;
+};
- while (bitmap) {
- bp = bitmap->next;
- free_page((unsigned long)bitmap);
- bitmap = bp;
- }
-}
+static struct rb_root swsusp_extents = RB_ROOT;
-struct bitmap_page *alloc_bitmap(unsigned int nr_bits)
+static int swsusp_extents_insert(unsigned long swap_offset)
{
- struct bitmap_page *bitmap, *bp;
- unsigned int n;
-
- if (!nr_bits)
- return NULL;
-
- bitmap = (struct bitmap_page *)get_zeroed_page(GFP_KERNEL);
- bp = bitmap;
- for (n = BITMAP_PAGE_BITS; n < nr_bits; n += BITMAP_PAGE_BITS) {
- bp->next = (struct bitmap_page *)get_zeroed_page(GFP_KERNEL);
- bp = bp->next;
- if (!bp) {
- free_bitmap(bitmap);
- return NULL;
+ struct rb_node **new = &(swsusp_extents.rb_node);
+ struct rb_node *parent = NULL;
+ struct swsusp_extent *ext;
+
+ /* Figure out where to put the new node */
+ while (*new) {
+ ext = container_of(*new, struct swsusp_extent, node);
+ parent = *new;
+ if (swap_offset < ext->start) {
+ /* Try to merge */
+ if (swap_offset == ext->start - 1) {
+ ext->start--;
+ return 0;
+ }
+ new = &((*new)->rb_left);
+ } else if (swap_offset > ext->end) {
+ /* Try to merge */
+ if (swap_offset == ext->end + 1) {
+ ext->end++;
+ return 0;
+ }
+ new = &((*new)->rb_right);
+ } else {
+ /* It already is in the tree */
+ return -EINVAL;
}
}
- return bitmap;
-}
-
-static int bitmap_set(struct bitmap_page *bitmap, unsigned long bit)
-{
- unsigned int n;
-
- n = BITMAP_PAGE_BITS;
- while (bitmap && n <= bit) {
- n += BITMAP_PAGE_BITS;
- bitmap = bitmap->next;
- }
- if (!bitmap)
- return -EINVAL;
- n -= BITMAP_PAGE_BITS;
- bit -= n;
- n = 0;
- while (bit >= BITS_PER_CHUNK) {
- bit -= BITS_PER_CHUNK;
- n++;
- }
- bitmap->chunks[n] |= (1UL << bit);
+ /* Add the new node and rebalance the tree. */
+ ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);
+ if (!ext)
+ return -ENOMEM;
+
+ ext->start = swap_offset;
+ ext->end = swap_offset;
+ rb_link_node(&ext->node, parent, new);
+ rb_insert_color(&ext->node, &swsusp_extents);
return 0;
}
-sector_t alloc_swapdev_block(int swap, struct bitmap_page *bitmap)
+/**
+ * alloc_swapdev_block - allocate a swap page and register that it has
+ * been allocated, so that it can be freed in case of an error.
+ */
+
+sector_t alloc_swapdev_block(int swap)
{
unsigned long offset;
offset = swp_offset(get_swap_page_of_type(swap));
if (offset) {
- if (bitmap_set(bitmap, offset))
+ if (swsusp_extents_insert(offset))
swap_free(swp_entry(swap, offset));
else
return swapdev_block(swap, offset);
@@ -147,23 +145,34 @@ sector_t alloc_swapdev_block(int swap, struct bitmap_page *bitmap)
return 0;
}
-void free_all_swap_pages(int swap, struct bitmap_page *bitmap)
+/**
+ * free_all_swap_pages - free swap pages allocated for saving image data.
+ * It also frees the extents used to register which swap entres had been
+ * allocated.
+ */
+
+void free_all_swap_pages(int swap)
{
- unsigned int bit, n;
- unsigned long test;
-
- bit = 0;
- while (bitmap) {
- for (n = 0; n < BITMAP_PAGE_CHUNKS; n++)
- for (test = 1UL; test; test <<= 1) {
- if (bitmap->chunks[n] & test)
- swap_free(swp_entry(swap, bit));
- bit++;
- }
- bitmap = bitmap->next;
+ struct rb_node *node;
+
+ while ((node = swsusp_extents.rb_node)) {
+ struct swsusp_extent *ext;
+ unsigned long offset;
+
+ ext = container_of(node, struct swsusp_extent, node);
+ rb_erase(node, &swsusp_extents);
+ for (offset = ext->start; offset <= ext->end; offset++)
+ swap_free(swp_entry(swap, offset));
+
+ kfree(ext);
}
}
+int swsusp_swap_in_use(void)
+{
+ return (swsusp_extents.rb_node != NULL);
+}
+
/**
* swsusp_show_speed - print the time elapsed between two events represented by
* @start and @stop
@@ -224,7 +233,7 @@ int swsusp_shrink_memory(void)
long size, highmem_size;
highmem_size = count_highmem_pages();
- size = count_data_pages() + PAGES_FOR_IO;
+ size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;
tmp = size;
size += highmem_size;
for_each_zone (zone)
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 7cf6713b232..040560d9c31 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -33,25 +33,29 @@
static struct snapshot_data {
struct snapshot_handle handle;
int swap;
- struct bitmap_page *bitmap;
int mode;
char frozen;
char ready;
char platform_suspend;
} snapshot_state;
-static atomic_t device_available = ATOMIC_INIT(1);
+atomic_t snapshot_device_available = ATOMIC_INIT(1);
static int snapshot_open(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
- if (!atomic_add_unless(&device_available, -1, 0))
+ if (!atomic_add_unless(&snapshot_device_available, -1, 0))
return -EBUSY;
- if ((filp->f_flags & O_ACCMODE) == O_RDWR)
+ if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
+ atomic_inc(&snapshot_device_available);
return -ENOSYS;
-
+ }
+ if(create_basic_memory_bitmaps()) {
+ atomic_inc(&snapshot_device_available);
+ return -ENOMEM;
+ }
nonseekable_open(inode, filp);
data = &snapshot_state;
filp->private_data = data;
@@ -64,7 +68,6 @@ static int snapshot_open(struct inode *inode, struct file *filp)
data->swap = -1;
data->mode = O_WRONLY;
}
- data->bitmap = NULL;
data->frozen = 0;
data->ready = 0;
data->platform_suspend = 0;
@@ -77,16 +80,15 @@ static int snapshot_release(struct inode *inode, struct file *filp)
struct snapshot_data *data;
swsusp_free();
+ free_basic_memory_bitmaps();
data = filp->private_data;
- free_all_swap_pages(data->swap, data->bitmap);
- free_bitmap(data->bitmap);
+ free_all_swap_pages(data->swap);
if (data->frozen) {
mutex_lock(&pm_mutex);
thaw_processes();
- enable_nonboot_cpus();
mutex_unlock(&pm_mutex);
}
- atomic_inc(&device_available);
+ atomic_inc(&snapshot_device_available);
return 0;
}
@@ -294,14 +296,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = -ENODEV;
break;
}
- if (!data->bitmap) {
- data->bitmap = alloc_bitmap(count_swap_pages(data->swap, 0));
- if (!data->bitmap) {
- error = -ENOMEM;
- break;
- }
- }
- offset = alloc_swapdev_block(data->swap, data->bitmap);
+ offset = alloc_swapdev_block(data->swap);
if (offset) {
offset <<= PAGE_SHIFT;
error = put_user(offset, (sector_t __user *)arg);
@@ -315,13 +310,11 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = -ENODEV;
break;
}
- free_all_swap_pages(data->swap, data->bitmap);
- free_bitmap(data->bitmap);
- data->bitmap = NULL;
+ free_all_swap_pages(data->swap);
break;
case SNAPSHOT_SET_SWAP_FILE:
- if (!data->bitmap) {
+ if (!swsusp_swap_in_use()) {
/*
* User space encodes device types as two-byte values,
* so we need to recode them
@@ -420,7 +413,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
break;
case SNAPSHOT_SET_SWAP_AREA:
- if (data->bitmap) {
+ if (swsusp_swap_in_use()) {
error = -EPERM;
} else {
struct resume_swap_area swap_area;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-23 03:15:13 +0000