From ce4ab0012b32c1a4a1d6e934aeb73bf3151c48d9 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Fri, 23 Jun 2006 02:04:44 -0700 Subject: [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 Cc: Pavel Machek Cc: "Rafael J. Wysocki" Cc: Nigel Cunningham Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/snapshot.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 109 insertions(+), 1 deletion(-) (limited to 'kernel/power/snapshot.c') diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 3eeedbb13b78..7f511d89c667 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)) -- cgit v1.2.3