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-rw-r--r--kernel/power/main.c2
-rw-r--r--kernel/power/power.h6
-rw-r--r--kernel/power/snapshot.c260
-rw-r--r--kernel/power/swsusp.c32
4 files changed, 219 insertions, 81 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 0a907f0dc56..cdf0f07af92 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -15,7 +15,7 @@
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/pm.h>
-
+#include <linux/console.h>
#include "power.h"
diff --git a/kernel/power/power.h b/kernel/power/power.h
index f06f12f2176..98c41423f3b 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -55,7 +55,7 @@ struct snapshot_handle {
unsigned int page;
unsigned int page_offset;
unsigned int prev;
- struct pbe *pbe;
+ struct pbe *pbe, *last_pbe;
void *buffer;
unsigned int buf_offset;
};
@@ -105,6 +105,10 @@ extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
+extern unsigned int count_special_pages(void);
+extern int save_special_mem(void);
+extern int restore_special_mem(void);
+
extern int swsusp_check(void);
extern int swsusp_shrink_memory(void);
extern void swsusp_free(void);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 3eeedbb13b7..3d9284100b2 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -39,8 +39,90 @@ static unsigned int nr_copy_pages;
static unsigned int nr_meta_pages;
static unsigned long *buffer;
+struct arch_saveable_page {
+ unsigned long start;
+ unsigned long end;
+ char *data;
+ struct arch_saveable_page *next;
+};
+static struct arch_saveable_page *arch_pages;
+
+int swsusp_add_arch_pages(unsigned long start, unsigned long end)
+{
+ struct arch_saveable_page *tmp;
+
+ while (start < end) {
+ tmp = kzalloc(sizeof(struct arch_saveable_page), GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+ tmp->start = start;
+ tmp->end = ((start >> PAGE_SHIFT) + 1) << PAGE_SHIFT;
+ if (tmp->end > end)
+ tmp->end = end;
+ tmp->next = arch_pages;
+ start = tmp->end;
+ arch_pages = tmp;
+ }
+ return 0;
+}
+
+static unsigned int count_arch_pages(void)
+{
+ unsigned int count = 0;
+ struct arch_saveable_page *tmp = arch_pages;
+ while (tmp) {
+ count++;
+ tmp = tmp->next;
+ }
+ return count;
+}
+
+static int save_arch_mem(void)
+{
+ char *kaddr;
+ struct arch_saveable_page *tmp = arch_pages;
+ int offset;
+
+ pr_debug("swsusp: Saving arch specific memory");
+ while (tmp) {
+ tmp->data = (char *)__get_free_page(GFP_ATOMIC);
+ if (!tmp->data)
+ return -ENOMEM;
+ offset = tmp->start - (tmp->start & PAGE_MASK);
+ /* arch pages might haven't a 'struct page' */
+ kaddr = kmap_atomic_pfn(tmp->start >> PAGE_SHIFT, KM_USER0);
+ memcpy(tmp->data + offset, kaddr + offset,
+ tmp->end - tmp->start);
+ kunmap_atomic(kaddr, KM_USER0);
+
+ tmp = tmp->next;
+ }
+ return 0;
+}
+
+static int restore_arch_mem(void)
+{
+ char *kaddr;
+ struct arch_saveable_page *tmp = arch_pages;
+ int offset;
+
+ while (tmp) {
+ if (!tmp->data)
+ continue;
+ offset = tmp->start - (tmp->start & PAGE_MASK);
+ kaddr = kmap_atomic_pfn(tmp->start >> PAGE_SHIFT, KM_USER0);
+ memcpy(kaddr + offset, tmp->data + offset,
+ tmp->end - tmp->start);
+ kunmap_atomic(kaddr, KM_USER0);
+ free_page((long)tmp->data);
+ tmp->data = NULL;
+ tmp = tmp->next;
+ }
+ return 0;
+}
+
#ifdef CONFIG_HIGHMEM
-unsigned int count_highmem_pages(void)
+static unsigned int count_highmem_pages(void)
{
struct zone *zone;
unsigned long zone_pfn;
@@ -117,7 +199,7 @@ static int save_highmem_zone(struct zone *zone)
return 0;
}
-int save_highmem(void)
+static int save_highmem(void)
{
struct zone *zone;
int res = 0;
@@ -134,7 +216,7 @@ int save_highmem(void)
return 0;
}
-int restore_highmem(void)
+static int restore_highmem(void)
{
printk("swsusp: Restoring Highmem\n");
while (highmem_copy) {
@@ -150,8 +232,35 @@ int restore_highmem(void)
}
return 0;
}
+#else
+static inline unsigned int count_highmem_pages(void) {return 0;}
+static inline int save_highmem(void) {return 0;}
+static inline int restore_highmem(void) {return 0;}
#endif
+unsigned int count_special_pages(void)
+{
+ return count_arch_pages() + count_highmem_pages();
+}
+
+int save_special_mem(void)
+{
+ int ret;
+ ret = save_arch_mem();
+ if (!ret)
+ ret = save_highmem();
+ return ret;
+}
+
+int restore_special_mem(void)
+{
+ int ret;
+ ret = restore_arch_mem();
+ if (!ret)
+ ret = restore_highmem();
+ return ret;
+}
+
static int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
@@ -177,7 +286,6 @@ static int saveable(struct zone *zone, unsigned long *zone_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))
@@ -293,62 +401,29 @@ static inline void create_pbe_list(struct pbe *pblist, unsigned int nr_pages)
}
}
-/**
- * On resume it is necessary to trace and eventually free the unsafe
- * pages that have been allocated, because they are needed for I/O
- * (on x86-64 we likely will "eat" these pages once again while
- * creating the temporary page translation tables)
- */
-
-struct eaten_page {
- struct eaten_page *next;
- char padding[PAGE_SIZE - sizeof(void *)];
-};
-
-static struct eaten_page *eaten_pages = NULL;
-
-static void release_eaten_pages(void)
-{
- struct eaten_page *p, *q;
-
- p = eaten_pages;
- while (p) {
- q = p->next;
- /* We don't want swsusp_free() to free this page again */
- ClearPageNosave(virt_to_page(p));
- free_page((unsigned long)p);
- p = q;
- }
- eaten_pages = NULL;
-}
+static unsigned int unsafe_pages;
/**
* @safe_needed - on resume, for storing the PBE list and the image,
* we can only use memory pages that do not conflict with the pages
- * which had been used before suspend.
+ * used before suspend.
*
* The unsafe pages are marked with the PG_nosave_free flag
- *
- * Allocated but unusable (ie eaten) memory pages should be marked
- * so that swsusp_free() can release them
+ * and we count them using unsafe_pages
*/
static inline void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
{
void *res;
+ res = (void *)get_zeroed_page(gfp_mask);
if (safe_needed)
- do {
+ while (res && PageNosaveFree(virt_to_page(res))) {
+ /* The page is unsafe, mark it for swsusp_free() */
+ SetPageNosave(virt_to_page(res));
+ unsafe_pages++;
res = (void *)get_zeroed_page(gfp_mask);
- if (res && PageNosaveFree(virt_to_page(res))) {
- /* This is for swsusp_free() */
- SetPageNosave(virt_to_page(res));
- ((struct eaten_page *)res)->next = eaten_pages;
- eaten_pages = res;
- }
- } while (res && PageNosaveFree(virt_to_page(res)));
- else
- res = (void *)get_zeroed_page(gfp_mask);
+ }
if (res) {
SetPageNosave(virt_to_page(res));
SetPageNosaveFree(virt_to_page(res));
@@ -374,7 +449,8 @@ unsigned long get_safe_page(gfp_t gfp_mask)
* On each page we set up a list of struct_pbe elements.
*/
-struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask, int safe_needed)
+static struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask,
+ int safe_needed)
{
unsigned int num;
struct pbe *pblist, *pbe;
@@ -642,6 +718,8 @@ static int mark_unsafe_pages(struct pbe *pblist)
return -EFAULT;
}
+ unsafe_pages = 0;
+
return 0;
}
@@ -719,42 +797,99 @@ static inline struct pbe *unpack_orig_addresses(unsigned long *buf,
}
/**
- * create_image - use metadata contained in the PBE list
+ * prepare_image - use metadata contained in the PBE list
* pointed to by pagedir_nosave to mark the pages that will
* be overwritten in the process of restoring the system
- * memory state from the image and allocate memory for
- * the image avoiding these pages
+ * memory state from the image ("unsafe" pages) and allocate
+ * memory for the image
+ *
+ * The idea is to allocate the PBE list first and then
+ * allocate as many pages as it's needed for the image data,
+ * but not to assign these pages to the PBEs initially.
+ * Instead, we just mark them as allocated and create a list
+ * of "safe" which will be used later
*/
-static int create_image(struct snapshot_handle *handle)
+struct safe_page {
+ struct safe_page *next;
+ char padding[PAGE_SIZE - sizeof(void *)];
+};
+
+static struct safe_page *safe_pages;
+
+static int prepare_image(struct snapshot_handle *handle)
{
int error = 0;
- struct pbe *p, *pblist;
+ unsigned int nr_pages = nr_copy_pages;
+ struct pbe *p, *pblist = NULL;
p = pagedir_nosave;
error = mark_unsafe_pages(p);
if (!error) {
- pblist = alloc_pagedir(nr_copy_pages, GFP_ATOMIC, 1);
+ pblist = alloc_pagedir(nr_pages, GFP_ATOMIC, 1);
if (pblist)
copy_page_backup_list(pblist, p);
free_pagedir(p, 0);
if (!pblist)
error = -ENOMEM;
}
- if (!error)
- error = alloc_data_pages(pblist, GFP_ATOMIC, 1);
+ safe_pages = NULL;
+ if (!error && nr_pages > unsafe_pages) {
+ nr_pages -= unsafe_pages;
+ while (nr_pages--) {
+ struct safe_page *ptr;
+
+ ptr = (struct safe_page *)get_zeroed_page(GFP_ATOMIC);
+ if (!ptr) {
+ error = -ENOMEM;
+ break;
+ }
+ if (!PageNosaveFree(virt_to_page(ptr))) {
+ /* The page is "safe", add it to the list */
+ ptr->next = safe_pages;
+ safe_pages = ptr;
+ }
+ /* Mark the page as allocated */
+ SetPageNosave(virt_to_page(ptr));
+ SetPageNosaveFree(virt_to_page(ptr));
+ }
+ }
if (!error) {
- release_eaten_pages();
pagedir_nosave = pblist;
} else {
- pagedir_nosave = NULL;
handle->pbe = NULL;
- nr_copy_pages = 0;
- nr_meta_pages = 0;
+ swsusp_free();
}
return error;
}
+static void *get_buffer(struct snapshot_handle *handle)
+{
+ struct pbe *pbe = handle->pbe, *last = handle->last_pbe;
+ struct page *page = virt_to_page(pbe->orig_address);
+
+ if (PageNosave(page) && PageNosaveFree(page)) {
+ /*
+ * We have allocated the "original" page frame and we can
+ * use it directly to store the read page
+ */
+ pbe->address = 0;
+ if (last && last->next)
+ last->next = NULL;
+ return (void *)pbe->orig_address;
+ }
+ /*
+ * The "original" page frame has not been allocated and we have to
+ * use a "safe" page frame to store the read page
+ */
+ pbe->address = (unsigned long)safe_pages;
+ safe_pages = safe_pages->next;
+ if (last)
+ last->next = pbe;
+ handle->last_pbe = pbe;
+ return (void *)pbe->address;
+}
+
/**
* snapshot_write_next - used for writing the system memory snapshot.
*
@@ -799,15 +934,16 @@ int snapshot_write_next(struct snapshot_handle *handle, size_t count)
} else if (handle->prev <= nr_meta_pages) {
handle->pbe = unpack_orig_addresses(buffer, handle->pbe);
if (!handle->pbe) {
- error = create_image(handle);
+ error = prepare_image(handle);
if (error)
return error;
handle->pbe = pagedir_nosave;
- handle->buffer = (void *)handle->pbe->address;
+ handle->last_pbe = NULL;
+ handle->buffer = get_buffer(handle);
}
} else {
handle->pbe = handle->pbe->next;
- handle->buffer = (void *)handle->pbe->address;
+ handle->buffer = get_buffer(handle);
}
handle->prev = handle->page;
}
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index c4016cbbd3e..f0ee4e7780d 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -62,16 +62,6 @@ unsigned long image_size = 500 * 1024 * 1024;
int in_suspend __nosavedata = 0;
-#ifdef CONFIG_HIGHMEM
-unsigned int count_highmem_pages(void);
-int save_highmem(void);
-int restore_highmem(void);
-#else
-static int save_highmem(void) { return 0; }
-static int restore_highmem(void) { return 0; }
-static unsigned int count_highmem_pages(void) { return 0; }
-#endif
-
/**
* The following functions are used for tracing the allocated
* swap pages, so that they can be freed in case of an error.
@@ -175,6 +165,12 @@ void free_all_swap_pages(int swap, struct bitmap_page *bitmap)
*/
#define SHRINK_BITE 10000
+static inline unsigned long __shrink_memory(long tmp)
+{
+ if (tmp > SHRINK_BITE)
+ tmp = SHRINK_BITE;
+ return shrink_all_memory(tmp);
+}
int swsusp_shrink_memory(void)
{
@@ -186,21 +182,23 @@ int swsusp_shrink_memory(void)
printk("Shrinking memory... ");
do {
- size = 2 * count_highmem_pages();
+ size = 2 * count_special_pages();
size += size / 50 + count_data_pages();
size += (size + PBES_PER_PAGE - 1) / PBES_PER_PAGE +
PAGES_FOR_IO;
tmp = size;
for_each_zone (zone)
- if (!is_highmem(zone))
+ if (!is_highmem(zone) && populated_zone(zone)) {
tmp -= zone->free_pages;
+ tmp += zone->lowmem_reserve[ZONE_NORMAL];
+ }
if (tmp > 0) {
- tmp = shrink_all_memory(SHRINK_BITE);
+ tmp = __shrink_memory(tmp);
if (!tmp)
return -ENOMEM;
pages += tmp;
} else if (size > image_size / PAGE_SIZE) {
- tmp = shrink_all_memory(SHRINK_BITE);
+ tmp = __shrink_memory(size - (image_size / PAGE_SIZE));
pages += tmp;
}
printk("\b%c", p[i++%4]);
@@ -228,7 +226,7 @@ int swsusp_suspend(void)
goto Enable_irqs;
}
- if ((error = save_highmem())) {
+ if ((error = save_special_mem())) {
printk(KERN_ERR "swsusp: Not enough free pages for highmem\n");
goto Restore_highmem;
}
@@ -239,7 +237,7 @@ int swsusp_suspend(void)
/* Restore control flow magically appears here */
restore_processor_state();
Restore_highmem:
- restore_highmem();
+ restore_special_mem();
device_power_up();
Enable_irqs:
local_irq_enable();
@@ -265,7 +263,7 @@ int swsusp_resume(void)
*/
swsusp_free();
restore_processor_state();
- restore_highmem();
+ restore_special_mem();
touch_softlockup_watchdog();
device_power_up();
local_irq_enable();
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-29 03:56:40 +0000