From d307c4a8e826c44f9633bd3f7e60d0491e7d885a Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 18 Oct 2007 03:04:52 -0700 Subject: [PATCH] Hibernation: Arbitrary boot kernel support - generic code Add the bits needed for supporting arbitrary boot kernels to the common hibernation code. To support arbitrary boot kernels, make it possible to replace the 'struct new_utsname' and the kernel version in the hibernation image header by some architecture specific data that will be used to verify if the image is valid and to restore the image. Signed-off-by: Rafael J. Wysocki Acked-by: Pavel Machek Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/power.h | 22 +++++++++++++++-- kernel/power/snapshot.c | 53 +++++++++++++++++++++++++++-------------- 2 files changed, 55 insertions(+), 20 deletions(-) diff --git a/kernel/power/power.h b/kernel/power/power.h index 95fbf2dd3fe3..a0204dfc6c4c 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -11,14 +11,32 @@ struct swsusp_info { unsigned long size; } __attribute__((aligned(PAGE_SIZE))); - - #ifdef CONFIG_HIBERNATION +#ifdef CONFIG_ARCH_HIBERNATION_HEADER +/* Maximum size of architecture specific data in a hibernation header */ +#define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4) + +extern int arch_hibernation_header_save(void *addr, unsigned int max_size); +extern int arch_hibernation_header_restore(void *addr); + +static inline int init_header_complete(struct swsusp_info *info) +{ + return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE); +} + +static inline char *check_image_kernel(struct swsusp_info *info) +{ + return arch_hibernation_header_restore(info) ? + "architecture specific data" : NULL; +} +#endif /* CONFIG_ARCH_HIBERNATION_HEADER */ + /* * 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. diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index a686590d88c1..ccc95ac07bed 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -1239,17 +1239,39 @@ asmlinkage int swsusp_save(void) return 0; } -static void init_header(struct swsusp_info *info) +#ifndef CONFIG_ARCH_HIBERNATION_HEADER +static int init_header_complete(struct swsusp_info *info) +{ + memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname)); + info->version_code = LINUX_VERSION_CODE; + return 0; +} + +static char *check_image_kernel(struct swsusp_info *info) +{ + if (info->version_code != LINUX_VERSION_CODE) + return "kernel version"; + if (strcmp(info->uts.sysname,init_utsname()->sysname)) + return "system type"; + if (strcmp(info->uts.release,init_utsname()->release)) + return "kernel release"; + if (strcmp(info->uts.version,init_utsname()->version)) + return "version"; + if (strcmp(info->uts.machine,init_utsname()->machine)) + return "machine"; + return NULL; +} +#endif /* CONFIG_ARCH_HIBERNATION_HEADER */ + +static int init_header(struct swsusp_info *info) { memset(info, 0, sizeof(struct swsusp_info)); - info->version_code = LINUX_VERSION_CODE; info->num_physpages = num_physpages; - memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname)); - info->cpus = num_online_cpus(); info->image_pages = nr_copy_pages; info->pages = nr_copy_pages + nr_meta_pages + 1; info->size = info->pages; info->size <<= PAGE_SHIFT; + return init_header_complete(info); } /** @@ -1303,7 +1325,11 @@ int snapshot_read_next(struct snapshot_handle *handle, size_t count) return -ENOMEM; } if (!handle->offset) { - init_header((struct swsusp_info *)buffer); + int error; + + error = init_header((struct swsusp_info *)buffer); + if (error) + return error; handle->buffer = buffer; memory_bm_position_reset(&orig_bm); memory_bm_position_reset(©_bm); @@ -1394,22 +1420,13 @@ duplicate_memory_bitmap(struct memory_bitmap *dst, struct memory_bitmap *src) } } -static inline int check_header(struct swsusp_info *info) +static int check_header(struct swsusp_info *info) { - char *reason = NULL; + char *reason; - if (info->version_code != LINUX_VERSION_CODE) - reason = "kernel version"; - if (info->num_physpages != num_physpages) + reason = check_image_kernel(info); + if (!reason && info->num_physpages != num_physpages) reason = "memory size"; - if (strcmp(info->uts.sysname,init_utsname()->sysname)) - reason = "system type"; - if (strcmp(info->uts.release,init_utsname()->release)) - reason = "kernel release"; - if (strcmp(info->uts.version,init_utsname()->version)) - reason = "version"; - if (strcmp(info->uts.machine,init_utsname()->machine)) - reason = "machine"; if (reason) { printk(KERN_ERR "swsusp: Resume mismatch: %s\n", reason); return -EPERM;