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authorShaohua Li <shaohua.li@intel.com>2006-06-23 02:04:44 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-23 07:42:59 -0700
commitce4ab0012b32c1a4a1d6e934aeb73bf3151c48d9 (patch)
tree83b5ba44e93eeb8b72fe14028ac25943f77844fe /kernel/power/snapshot.c
parent82dcaafc92fdfbe2c1d6c50b9f5e17d533caf950 (diff)
[PATCH] swsusp: add architecture special saveable pages support
1. Add architecture specific pages save/restore support. Next two patches will use this to save/restore 'ACPI NVS' pages. 2. Allow reserved pages 'nosave'. This could avoid save/restore BIOS reserved pages. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Nigel Cunningham <nigel@suspend2.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power/snapshot.c')
-rw-r--r--kernel/power/snapshot.c110
1 files changed, 109 insertions, 1 deletions
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 3eeedbb13b7..7f511d89c66 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -39,6 +39,88 @@ 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)
{
@@ -150,8 +232,35 @@ int restore_highmem(void)
}
return 0;
}
+#else
+static unsigned int count_highmem_pages(void) {return 0;}
+static int save_highmem(void) {return 0;}
+static 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))