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Merge branch 'suspend' into release

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This commit is contained in:
Len Brown 2009-01-09 03:38:15 -05:00
commit 3cc8a5f4ba
9 changed files with 446 additions and 201 deletions
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45
Documentation/kernel-parameters.txt
View File

@ -150,16 +150,20 @@ and is between 256 and 4096 characters. It is defined in the file
default: 0
acpi_sleep= [HW,ACPI] Sleep options
Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, old_ordering }
See Documentation/power/video.txt for s3_bios and s3_mode.
Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig,
old_ordering, s4_nonvs }
See Documentation/power/video.txt for information on
s3_bios and s3_mode.
s3_beep is for debugging; it makes the PC's speaker beep
as soon as the kernel's real-mode entry point is called.
s4_nohwsig prevents ACPI hardware signature from being
used during resume from hibernation.
old_ordering causes the ACPI 1.0 ordering of the _PTS
control method, wrt putting devices into low power
states, to be enforced (the ACPI 2.0 ordering of _PTS is
used by default).
control method, with respect to putting devices into
low power states, to be enforced (the ACPI 2.0 ordering
of _PTS is used by default).
s4_nonvs prevents the kernel from saving/restoring the
ACPI NVS memory during hibernation.
acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
Format: { level | edge | high | low }
@ -194,7 +198,7 @@ and is between 256 and 4096 characters. It is defined in the file
acpi_skip_timer_override [HW,ACPI]
Recognize and ignore IRQ0/pin2 Interrupt Override.
For broken nForce2 BIOS resulting in XT-PIC timer.
acpi_use_timer_override [HW,ACPI}
acpi_use_timer_override [HW,ACPI]
Use timer override. For some broken Nvidia NF5 boards
that require a timer override, but don't have
HPET
@ -861,17 +865,19 @@ and is between 256 and 4096 characters. It is defined in the file
See Documentation/ide/ide.txt.
idle= [X86]
Format: idle=poll or idle=mwait, idle=halt, idle=nomwait
Poll forces a polling idle loop that can slightly improves the performance
of waking up a idle CPU, but will use a lot of power and make the system
run hot. Not recommended.
idle=mwait. On systems which support MONITOR/MWAIT but the kernel chose
to not use it because it doesn't save as much power as a normal idle
loop use the MONITOR/MWAIT idle loop anyways. Performance should be the same
as idle=poll.
idle=halt. Halt is forced to be used for CPU idle.
Format: idle=poll, idle=mwait, idle=halt, idle=nomwait
Poll forces a polling idle loop that can slightly
improve the performance of waking up a idle CPU, but
will use a lot of power and make the system run hot.
Not recommended.
idle=mwait: On systems which support MONITOR/MWAIT but
the kernel chose to not use it because it doesn't save
as much power as a normal idle loop, use the
MONITOR/MWAIT idle loop anyways. Performance should be
the same as idle=poll.
idle=halt: Halt is forced to be used for CPU idle.
In such case C2/C3 won't be used again.
idle=nomwait. Disable mwait for CPU C-states
idle=nomwait: Disable mwait for CPU C-states
ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
Claim all unknown PCI IDE storage controllers.
@ -1053,8 +1059,8 @@ and is between 256 and 4096 characters. It is defined in the file
lapic [X86-32,APIC] Enable the local APIC even if BIOS
disabled it.
lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer in
C2 power state.
lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer
in C2 power state.
libata.dma= [LIBATA] DMA control
libata.dma=0 Disable all PATA and SATA DMA
@ -2242,7 +2248,8 @@ and is between 256 and 4096 characters. It is defined in the file
thermal.psv= [HW,ACPI]
-1: disable all passive trip points
<degrees C>: override all passive trip points to this value
<degrees C>: override all passive trip points to this
value
thermal.tzp= [HW,ACPI]
Specify global default ACPI thermal zone polling rate

2
arch/x86/kernel/acpi/sleep.c
View File

@ -159,6 +159,8 @@ static int __init acpi_sleep_setup(char *str)
#endif
if (strncmp(str, "old_ordering", 12) == 0)
acpi_old_suspend_ordering();
if (strncmp(str, "s4_nonvs", 8) == 0)
acpi_s4_no_nvs();
str = strchr(str, ',');
if (str != NULL)
str += strspn(str, ", \t");

21
arch/x86/kernel/e820.c
View File

@ -665,6 +665,27 @@ void __init e820_mark_nosave_regions(unsigned long limit_pfn)
}
#endif
#ifdef CONFIG_HIBERNATION
/**
* Mark ACPI NVS memory region, so that we can save/restore it during
* hibernation and the subsequent resume.
*/
static int __init e820_mark_nvs_memory(void)
{
int i;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
if (ei->type == E820_NVS)
hibernate_nvs_register(ei->addr, ei->size);
}
return 0;
}
core_initcall(e820_mark_nvs_memory);
#endif
/*
* Early reserved memory areas.
*/

67
drivers/acpi/main.c
View File

@ -101,6 +101,19 @@ void __init acpi_old_suspend_ordering(void)
* cases.
*/
static bool set_sci_en_on_resume;
/*
* The ACPI specification wants us to save NVS memory regions during hibernation
* and to restore them during the subsequent resume. However, it is not certain
* if this mechanism is going to work on all machines, so we allow the user to
* disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
* option.
*/
static bool s4_no_nvs;
void __init acpi_s4_no_nvs(void)
{
s4_no_nvs = true;
}
/**
* acpi_pm_disable_gpes - Disable the GPEs.
@ -394,9 +407,25 @@ void __init acpi_no_s4_hw_signature(void)
static int acpi_hibernation_begin(void)
{
acpi_target_sleep_state = ACPI_STATE_S4;
acpi_sleep_tts_switch(acpi_target_sleep_state);
return 0;
int error;
error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
if (!error) {
acpi_target_sleep_state = ACPI_STATE_S4;
acpi_sleep_tts_switch(acpi_target_sleep_state);
}
return error;
}
static int acpi_hibernation_pre_snapshot(void)
{
int error = acpi_pm_prepare();
if (!error)
hibernate_nvs_save();
return error;
}
static int acpi_hibernation_enter(void)
@ -417,6 +446,12 @@ static int acpi_hibernation_enter(void)
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
static void acpi_hibernation_finish(void)
{
hibernate_nvs_free();
acpi_pm_finish();
}
static void acpi_hibernation_leave(void)
{
/*
@ -432,6 +467,8 @@ static void acpi_hibernation_leave(void)
"cannot resume!\n");
panic("ACPI S4 hardware signature mismatch");
}
/* Restore the NVS memory area */
hibernate_nvs_restore();
}
static void acpi_pm_enable_gpes(void)
@ -442,8 +479,8 @@ static void acpi_pm_enable_gpes(void)
static struct platform_hibernation_ops acpi_hibernation_ops = {
.begin = acpi_hibernation_begin,
.end = acpi_pm_end,
.pre_snapshot = acpi_pm_prepare,
.finish = acpi_pm_finish,
.pre_snapshot = acpi_hibernation_pre_snapshot,
.finish = acpi_hibernation_finish,
.prepare = acpi_pm_prepare,
.enter = acpi_hibernation_enter,
.leave = acpi_hibernation_leave,
@ -469,8 +506,22 @@ static int acpi_hibernation_begin_old(void)
error = acpi_sleep_prepare(ACPI_STATE_S4);
if (!error) {
if (!s4_no_nvs)
error = hibernate_nvs_alloc();
if (!error)
acpi_target_sleep_state = ACPI_STATE_S4;
}
return error;
}
static int acpi_hibernation_pre_snapshot_old(void)
{
int error = acpi_pm_disable_gpes();
if (!error)
acpi_target_sleep_state = ACPI_STATE_S4;
hibernate_nvs_save();
return error;
}
@ -481,8 +532,8 @@ static int acpi_hibernation_begin_old(void)
static struct platform_hibernation_ops acpi_hibernation_ops_old = {
.begin = acpi_hibernation_begin_old,
.end = acpi_pm_end,
.pre_snapshot = acpi_pm_disable_gpes,
.finish = acpi_pm_finish,
.pre_snapshot = acpi_hibernation_pre_snapshot_old,
.finish = acpi_hibernation_finish,
.prepare = acpi_pm_disable_gpes,
.enter = acpi_hibernation_enter,
.leave = acpi_hibernation_leave,

1
include/linux/acpi.h
View File

@ -270,6 +270,7 @@ int acpi_check_mem_region(resource_size_t start, resource_size_t n,
#ifdef CONFIG_PM_SLEEP
void __init acpi_no_s4_hw_signature(void);
void __init acpi_old_suspend_ordering(void);
void __init acpi_s4_no_nvs(void);
#endif /* CONFIG_PM_SLEEP */
#else /* CONFIG_ACPI */

13
include/linux/suspend.h
View File

@ -232,6 +232,11 @@ extern unsigned long get_safe_page(gfp_t gfp_mask);
extern void hibernation_set_ops(struct platform_hibernation_ops *ops);
extern int hibernate(void);
extern int hibernate_nvs_register(unsigned long start, unsigned long size);
extern int hibernate_nvs_alloc(void);
extern void hibernate_nvs_free(void);
extern void hibernate_nvs_save(void);
extern void hibernate_nvs_restore(void);
#else /* CONFIG_HIBERNATION */
static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
static inline void swsusp_set_page_free(struct page *p) {}
@ -239,6 +244,14 @@ static inline void swsusp_unset_page_free(struct page *p) {}
static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {}
static inline int hibernate(void) { return -ENOSYS; }
static inline int hibernate_nvs_register(unsigned long a, unsigned long b)
{
return 0;
}
static inline int hibernate_nvs_alloc(void) { return 0; }
static inline void hibernate_nvs_free(void) {}
static inline void hibernate_nvs_save(void) {}
static inline void hibernate_nvs_restore(void) {}
#endif /* CONFIG_HIBERNATION */
#ifdef CONFIG_PM_SLEEP

6
kernel/power/disk.c
View File

@ -259,12 +259,12 @@ int hibernation_snapshot(int platform_mode)
{
int error, ftrace_save;
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
error = platform_begin(platform_mode);
if (error)
return error;
error = platform_begin(platform_mode);
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
if (error)
goto Close;

370
kernel/power/snapshot.c
View File

@ -25,6 +25,7 @@
#include <linux/syscalls.h>
#include <linux/console.h>
#include <linux/highmem.h>
#include <linux/list.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
@ -192,12 +193,6 @@ static void *chain_alloc(struct chain_allocator *ca, unsigned int size)
return ret;
}
static void chain_free(struct chain_allocator *ca, int clear_page_nosave)
{
free_list_of_pages(ca->chain, clear_page_nosave);
memset(ca, 0, sizeof(struct chain_allocator));
}
/**
* Data types related to memory bitmaps.
*
@ -233,7 +228,7 @@ static void chain_free(struct chain_allocator *ca, int clear_page_nosave)
#define BM_BITS_PER_BLOCK (PAGE_SIZE << 3)
struct bm_block {
struct bm_block *next; /* next element of the list */
struct list_head hook; /* hook into a list of bitmap blocks */
unsigned long start_pfn; /* pfn represented by the first bit */
unsigned long end_pfn; /* pfn represented by the last bit plus 1 */
unsigned long *data; /* bitmap representing pages */
@ -244,24 +239,15 @@ static inline unsigned long bm_block_bits(struct bm_block *bb)
return bb->end_pfn - bb->start_pfn;
}
struct zone_bitmap {
struct zone_bitmap *next; /* next element of the list */
unsigned long start_pfn; /* minimal pfn in this zone */
unsigned long end_pfn; /* maximal pfn in this zone plus 1 */
struct bm_block *bm_blocks; /* list of bitmap blocks */
struct bm_block *cur_block; /* recently used bitmap block */
};
/* strcut bm_position is used for browsing memory bitmaps */
struct bm_position {
struct zone_bitmap *zone_bm;
struct bm_block *block;
int bit;
};
struct memory_bitmap {
struct zone_bitmap *zone_bm_list; /* list of zone bitmaps */
struct list_head blocks; /* list of bitmap blocks */
struct linked_page *p_list; /* list of pages used to store zone
* bitmap objects and bitmap block
* objects
@ -273,11 +259,7 @@ struct memory_bitmap {
static void memory_bm_position_reset(struct memory_bitmap *bm)
{
struct zone_bitmap *zone_bm;
zone_bm = bm->zone_bm_list;
bm->cur.zone_bm = zone_bm;
bm->cur.block = zone_bm->bm_blocks;
bm->cur.block = list_entry(bm->blocks.next, struct bm_block, hook);
bm->cur.bit = 0;
}
@ -285,151 +267,184 @@ static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free);
/**
* create_bm_block_list - create a list of block bitmap objects
* @nr_blocks - number of blocks to allocate
* @list - list to put the allocated blocks into
* @ca - chain allocator to be used for allocating memory
*/
static inline struct bm_block *
create_bm_block_list(unsigned int nr_blocks, struct chain_allocator *ca)
static int create_bm_block_list(unsigned long pages,
struct list_head *list,
struct chain_allocator *ca)
{
struct bm_block *bblist = NULL;
unsigned int nr_blocks = DIV_ROUND_UP(pages, BM_BITS_PER_BLOCK);
while (nr_blocks-- > 0) {
struct bm_block *bb;
bb = chain_alloc(ca, sizeof(struct bm_block));
if (!bb)
return NULL;
bb->next = bblist;
bblist = bb;
return -ENOMEM;
list_add(&bb->hook, list);
}
return 0;
}
struct mem_extent {
struct list_head hook;
unsigned long start;
unsigned long end;
};
/**
* free_mem_extents - free a list of memory extents
* @list - list of extents to empty
*/
static void free_mem_extents(struct list_head *list)
{
struct mem_extent *ext, *aux;
list_for_each_entry_safe(ext, aux, list, hook) {
list_del(&ext->hook);
kfree(ext);
}
return bblist;
}
/**
* create_zone_bm_list - create a list of zone bitmap objects
* create_mem_extents - create a list of memory extents representing
* contiguous ranges of PFNs
* @list - list to put the extents into
* @gfp_mask - mask to use for memory allocations
*/
static inline struct zone_bitmap *
create_zone_bm_list(unsigned int nr_zones, struct chain_allocator *ca)
static int create_mem_extents(struct list_head *list, gfp_t gfp_mask)
{
struct zone_bitmap *zbmlist = NULL;
struct zone *zone;
while (nr_zones-- > 0) {
struct zone_bitmap *zbm;
INIT_LIST_HEAD(list);
zbm = chain_alloc(ca, sizeof(struct zone_bitmap));
if (!zbm)
return NULL;
for_each_zone(zone) {
unsigned long zone_start, zone_end;
struct mem_extent *ext, *cur, *aux;
zbm->next = zbmlist;
zbmlist = zbm;
if (!populated_zone(zone))
continue;
zone_start = zone->zone_start_pfn;
zone_end = zone->zone_start_pfn + zone->spanned_pages;
list_for_each_entry(ext, list, hook)
if (zone_start <= ext->end)
break;
if (&ext->hook == list || zone_end < ext->start) {
/* New extent is necessary */
struct mem_extent *new_ext;
new_ext = kzalloc(sizeof(struct mem_extent), gfp_mask);
if (!new_ext) {
free_mem_extents(list);
return -ENOMEM;
}
new_ext->start = zone_start;
new_ext->end = zone_end;
list_add_tail(&new_ext->hook, &ext->hook);
continue;
}
/* Merge this zone's range of PFNs with the existing one */
if (zone_start < ext->start)
ext->start = zone_start;
if (zone_end > ext->end)
ext->end = zone_end;
/* More merging may be possible */
cur = ext;
list_for_each_entry_safe_continue(cur, aux, list, hook) {
if (zone_end < cur->start)
break;
if (zone_end < cur->end)
ext->end = cur->end;
list_del(&cur->hook);
kfree(cur);
}
}
return zbmlist;
return 0;
}
/**
* memory_bm_create - allocate memory for a memory bitmap
*/
static int
memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask, int safe_needed)
{
struct chain_allocator ca;
struct zone *zone;
struct zone_bitmap *zone_bm;
struct bm_block *bb;
unsigned int nr;
struct list_head mem_extents;
struct mem_extent *ext;
int error;
chain_init(&ca, gfp_mask, safe_needed);
INIT_LIST_HEAD(&bm->blocks);
/* Compute the number of zones */
nr = 0;
for_each_zone(zone)
if (populated_zone(zone))
nr++;
error = create_mem_extents(&mem_extents, gfp_mask);
if (error)
return error;
/* Allocate the list of zones bitmap objects */
zone_bm = create_zone_bm_list(nr, &ca);
bm->zone_bm_list = zone_bm;
if (!zone_bm) {
chain_free(&ca, PG_UNSAFE_CLEAR);
return -ENOMEM;
}
list_for_each_entry(ext, &mem_extents, hook) {
struct bm_block *bb;
unsigned long pfn = ext->start;
unsigned long pages = ext->end - ext->start;
/* Initialize the zone bitmap objects */
for_each_zone(zone) {
unsigned long pfn;
bb = list_entry(bm->blocks.prev, struct bm_block, hook);
if (!populated_zone(zone))
continue;
error = create_bm_block_list(pages, bm->blocks.prev, &ca);
if (error)
goto Error;
zone_bm->start_pfn = zone->zone_start_pfn;
zone_bm->end_pfn = zone->zone_start_pfn + zone->spanned_pages;
/* Allocate the list of bitmap block objects */
nr = DIV_ROUND_UP(zone->spanned_pages, BM_BITS_PER_BLOCK);
bb = create_bm_block_list(nr, &ca);
zone_bm->bm_blocks = bb;
zone_bm->cur_block = bb;
if (!bb)
goto Free;
nr = zone->spanned_pages;
pfn = zone->zone_start_pfn;
/* Initialize the bitmap block objects */
while (bb) {
unsigned long *ptr;
ptr = get_image_page(gfp_mask, safe_needed);
bb->data = ptr;
if (!ptr)
goto Free;
list_for_each_entry_continue(bb, &bm->blocks, hook) {
bb->data = get_image_page(gfp_mask, safe_needed);
if (!bb->data) {
error = -ENOMEM;
goto Error;
}
bb->start_pfn = pfn;
if (nr >= BM_BITS_PER_BLOCK) {
if (pages >= BM_BITS_PER_BLOCK) {
pfn += BM_BITS_PER_BLOCK;
nr -= BM_BITS_PER_BLOCK;
pages -= BM_BITS_PER_BLOCK;
} else {
/* This is executed only once in the loop */
pfn += nr;
pfn += pages;
}
bb->end_pfn = pfn;
bb = bb->next;
}
zone_bm = zone_bm->next;
}
bm->p_list = ca.chain;
memory_bm_position_reset(bm);
return 0;
Exit:
free_mem_extents(&mem_extents);
return error;
Free:
Error:
bm->p_list = ca.chain;
memory_bm_free(bm, PG_UNSAFE_CLEAR);
return -ENOMEM;
goto Exit;
}
/**
* memory_bm_free - free memory occupied by the memory bitmap @bm
*/
static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free)
{
struct zone_bitmap *zone_bm;
struct bm_block *bb;
/* Free the list of bit blocks for each zone_bitmap object */
zone_bm = bm->zone_bm_list;
while (zone_bm) {
struct bm_block *bb;
list_for_each_entry(bb, &bm->blocks, hook)
if (bb->data)
free_image_page(bb->data, clear_nosave_free);
bb = zone_bm->bm_blocks;
while (bb) {
if (bb->data)
free_image_page(bb->data, clear_nosave_free);
bb = bb->next;
}
zone_bm = zone_bm->next;
}
free_list_of_pages(bm->p_list, clear_nosave_free);
bm->zone_bm_list = NULL;
INIT_LIST_HEAD(&bm->blocks);
}
/**
@ -437,38 +452,33 @@ static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free)
* to given pfn. The cur_zone_bm member of @bm and the cur_block member
* of @bm->cur_zone_bm are updated.
*/
static int 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;
/* Check if the pfn is from the current zone */
zone_bm = bm->cur.zone_bm;
if (pfn < zone_bm->start_pfn || pfn >= zone_bm->end_pfn) {
zone_bm = bm->zone_bm_list;
/* 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 (!zone_bm)
return -EFAULT;
}
bm->cur.zone_bm = zone_bm;
}
/* Check if the pfn corresponds to the current bitmap block */
bb = zone_bm->cur_block;
/*
* Check if the pfn corresponds to the current bitmap block and find
* the block where it fits if this is not the case.
*/
bb = bm->cur.block;
if (pfn < bb->start_pfn)
bb = zone_bm->bm_blocks;
list_for_each_entry_continue_reverse(bb, &bm->blocks, hook)
if (pfn >= bb->start_pfn)
break;
while (pfn >= bb->end_pfn) {
bb = bb->next;
if (pfn >= bb->end_pfn)
list_for_each_entry_continue(bb, &bm->blocks, hook)
if (pfn >= bb->start_pfn && pfn < bb->end_pfn)
break;
BUG_ON(!bb);
}
zone_bm->cur_block = bb;
if (&bb->hook == &bm->blocks)
return -EFAULT;
/* The block has been found */
bm->cur.block = bb;
pfn -= bb->start_pfn;
bm->cur.bit = pfn + 1;
*bit_nr = pfn;
*addr = bb->data;
return 0;
@ -519,6 +529,14 @@ static int memory_bm_test_bit(struct memory_bitmap *bm, unsigned long pfn)
return test_bit(bit, addr);
}
static bool memory_bm_pfn_present(struct memory_bitmap *bm, unsigned long pfn)
{
void *addr;
unsigned int bit;
return !memory_bm_find_bit(bm, pfn, &addr, &bit);
}
/**
* memory_bm_next_pfn - find the pfn that corresponds to the next set bit
* in the bitmap @bm. If the pfn cannot be found, BM_END_OF_MAP is
@ -530,29 +548,21 @@ static int memory_bm_test_bit(struct memory_bitmap *bm, unsigned long pfn)
static unsigned long memory_bm_next_pfn(struct memory_bitmap *bm)
{
struct zone_bitmap *zone_bm;
struct bm_block *bb;
int bit;
bb = bm->cur.block;
do {
bb = bm->cur.block;
do {
bit = bm->cur.bit;
bit = find_next_bit(bb->data, bm_block_bits(bb), bit);
if (bit < bm_block_bits(bb))
goto Return_pfn;
bit = bm->cur.bit;
bit = find_next_bit(bb->data, bm_block_bits(bb), bit);
if (bit < bm_block_bits(bb))
goto Return_pfn;
bb = list_entry(bb->hook.next, struct bm_block, hook);
bm->cur.block = bb;
bm->cur.bit = 0;
} while (&bb->hook != &bm->blocks);
bb = bb->next;
bm->cur.block = bb;
bm->cur.bit = 0;
} while (bb);
zone_bm = bm->cur.zone_bm->next;
if (zone_bm) {
bm->cur.zone_bm = zone_bm;
bm->cur.block = zone_bm->bm_blocks;
bm->cur.bit = 0;
}
} while (zone_bm);
memory_bm_position_reset(bm);
return BM_END_OF_MAP;
@ -808,8 +818,7 @@ static unsigned int count_free_highmem_pages(void)
* We should save the page if it isn't Nosave or NosaveFree, or Reserved,
* and it isn't a part of a free chunk of pages.
*/
static struct page *saveable_highmem_page(unsigned long pfn)
static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn)
{
struct page *page;
@ -817,6 +826,8 @@ static struct page *saveable_highmem_page(unsigned long pfn)
return NULL;
page = pfn_to_page(pfn);
if (page_zone(page) != zone)
return NULL;
BUG_ON(!PageHighMem(page));
@ -846,13 +857,16 @@ unsigned int count_highmem_pages(void)
mark_free_pages(zone);
max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
if (saveable_highmem_page(pfn))
if (saveable_highmem_page(zone, pfn))
n++;
}
return n;
}
#else
static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
static inline void *saveable_highmem_page(struct zone *z, unsigned long p)
{
return NULL;
}
#endif /* CONFIG_HIGHMEM */
/**
@ -863,8 +877,7 @@ static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
* of pages statically defined as 'unsaveable', and it isn't a part of
* a free chunk of pages.
*/
static struct page *saveable_page(unsigned long pfn)
static struct page *saveable_page(struct zone *zone, unsigned long pfn)
{
struct page *page;
@ -872,6 +885,8 @@ static struct page *saveable_page(unsigned long pfn)
return NULL;
page = pfn_to_page(pfn);
if (page_zone(page) != zone)
return NULL;
BUG_ON(PageHighMem(page));
@ -903,7 +918,7 @@ unsigned int count_data_pages(void)
mark_free_pages(zone);
max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
if(saveable_page(pfn))
if (saveable_page(zone, pfn))
n++;
}
return n;
@ -944,7 +959,7 @@ static inline struct page *
page_is_saveable(struct zone *zone, unsigned long pfn)
{
return is_highmem(zone) ?
saveable_highmem_page(pfn) : saveable_page(pfn);
saveable_highmem_page(zone, pfn) : saveable_page(zone, pfn);
}
static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
@ -966,7 +981,7 @@ static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
* data modified by kmap_atomic()
*/
safe_copy_page(buffer, s_page);
dst = kmap_atomic(pfn_to_page(dst_pfn), KM_USER0);
dst = kmap_atomic(d_page, KM_USER0);
memcpy(dst, buffer, PAGE_SIZE);
kunmap_atomic(dst, KM_USER0);
} else {
@ -975,7 +990,7 @@ static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
}
}
#else
#define page_is_saveable(zone, pfn) saveable_page(pfn)
#define page_is_saveable(zone, pfn) saveable_page(zone, pfn)
static inline void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn)
{
@ -1459,9 +1474,7 @@ load_header(struct swsusp_info *info)
* unpack_orig_pfns - for each element of @buf[] (1 page at a time) set
* the corresponding bit in the memory bitmap @bm
*/
static inline void
unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm)
static int unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm)
{
int j;
@ -1469,8 +1482,13 @@ unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm)
if (unlikely(buf[j] == BM_END_OF_MAP))
break;
memory_bm_set_bit(bm, buf[j]);
if (memory_bm_pfn_present(bm, buf[j]))
memory_bm_set_bit(bm, buf[j]);
else
return -EFAULT;
}
return 0;
}
/* List of "safe" pages that may be used to store data loaded from the suspend
@ -1608,7 +1626,7 @@ get_highmem_page_buffer(struct page *page, struct chain_allocator *ca)
pbe = chain_alloc(ca, sizeof(struct highmem_pbe));
if (!pbe) {
swsusp_free();
return NULL;
return ERR_PTR(-ENOMEM);
}
pbe->orig_page = page;
if (safe_highmem_pages > 0) {
@ -1677,7 +1695,7 @@ prepare_highmem_image(struct memory_bitmap *bm, unsigned int *nr_highmem_p)
static inline void *
get_highmem_page_buffer(struct page *page, struct chain_allocator *ca)
{
return NULL;
return ERR_PTR(-EINVAL);
}
static inline void copy_last_highmem_page(void) {}
@ -1788,8 +1806,13 @@ prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm)
static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca)
{
struct pbe *pbe;
struct page *page = pfn_to_page(memory_bm_next_pfn(bm));
struct page *page;
unsigned long pfn = memory_bm_next_pfn(bm);
if (pfn == BM_END_OF_MAP)
return ERR_PTR(-EFAULT);
page = pfn_to_page(pfn);
if (PageHighMem(page))
return get_highmem_page_buffer(page, ca);
@ -1805,7 +1828,7 @@ static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca)
pbe = chain_alloc(ca, sizeof(struct pbe));
if (!pbe) {
swsusp_free();
return NULL;
return ERR_PTR(-ENOMEM);
}
pbe->orig_address = page_address(page);
pbe->address = safe_pages_list;
@ -1868,7 +1891,10 @@ int snapshot_write_next(struct snapshot_handle *handle, size_t count)
return error;
} else if (handle->prev <= nr_meta_pages) {
unpack_orig_pfns(buffer, &copy_bm);
error = unpack_orig_pfns(buffer, &copy_bm);
if (error)
return error;
if (handle->prev == nr_meta_pages) {
error = prepare_image(&orig_bm, &copy_bm);
if (error)
@ -1879,12 +1905,14 @@ int snapshot_write_next(struct snapshot_handle *handle, size_t count)
restore_pblist = NULL;
handle->buffer = get_buffer(&orig_bm, &ca);
handle->sync_read = 0;
if (!handle->buffer)
return -ENOMEM;
if (IS_ERR(handle->buffer))
return PTR_ERR(handle->buffer);
}
} else {
copy_last_highmem_page();
handle->buffer = get_buffer(&orig_bm, &ca);
if (IS_ERR(handle->buffer))
return PTR_ERR(handle->buffer);
if (handle->buffer != buffer)
handle->sync_read = 0;
}

122
kernel/power/swsusp.c
View File

@ -262,3 +262,125 @@ int swsusp_shrink_memory(void)
return 0;
}
/*
* Platforms, like ACPI, may want us to save some memory used by them during
* hibernation and to restore the contents of this memory during the subsequent
* resume. The code below implements a mechanism allowing us to do that.
*/
struct nvs_page {
unsigned long phys_start;
unsigned int size;
void *kaddr;
void *data;
struct list_head node;
};
static LIST_HEAD(nvs_list);
/**
* hibernate_nvs_register - register platform NVS memory region to save
* @start - physical address of the region
* @size - size of the region
*
* The NVS region need not be page-aligned (both ends) and we arrange
* things so that the data from page-aligned addresses in this region will
* be copied into separate RAM pages.
*/
int hibernate_nvs_register(unsigned long start, unsigned long size)
{
struct nvs_page *entry, *next;
while (size > 0) {
unsigned int nr_bytes;
entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL);
if (!entry)
goto Error;
list_add_tail(&entry->node, &nvs_list);
entry->phys_start = start;
nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK);
entry->size = (size < nr_bytes) ? size : nr_bytes;
start += entry->size;
size -= entry->size;
}
return 0;
Error:
list_for_each_entry_safe(entry, next, &nvs_list, node) {
list_del(&entry->node);
kfree(entry);
}
return -ENOMEM;
}
/**
* hibernate_nvs_free - free data pages allocated for saving NVS regions
*/
void hibernate_nvs_free(void)
{
struct nvs_page *entry;
list_for_each_entry(entry, &nvs_list, node)
if (entry->data) {
free_page((unsigned long)entry->data);
entry->data = NULL;
if (entry->kaddr) {
iounmap(entry->kaddr);
entry->kaddr = NULL;
}
}
}
/**
* hibernate_nvs_alloc - allocate memory necessary for saving NVS regions
*/
int hibernate_nvs_alloc(void)
{
struct nvs_page *entry;
list_for_each_entry(entry, &nvs_list, node) {
entry->data = (void *)__get_free_page(GFP_KERNEL);
if (!entry->data) {
hibernate_nvs_free();
return -ENOMEM;
}
}
return 0;
}
/**
* hibernate_nvs_save - save NVS memory regions
*/
void hibernate_nvs_save(void)
{
struct nvs_page *entry;
printk(KERN_INFO "PM: Saving platform NVS memory\n");
list_for_each_entry(entry, &nvs_list, node)
if (entry->data) {
entry->kaddr = ioremap(entry->phys_start, entry->size);
memcpy(entry->data, entry->kaddr, entry->size);
}
}
/**
* hibernate_nvs_restore - restore NVS memory regions
*
* This function is going to be called with interrupts disabled, so it
* cannot iounmap the virtual addresses used to access the NVS region.
*/
void hibernate_nvs_restore(void)
{
struct nvs_page *entry;
printk(KERN_INFO "PM: Restoring platform NVS memory\n");
list_for_each_entry(entry, &nvs_list, node)
if (entry->data)
memcpy(entry->kaddr, entry->data, entry->size);
}