Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1 | /* |
Pavel Machek | 96bc7ae | 2005-10-30 14:59:58 -0800 | [diff] [blame] | 2 | * linux/kernel/power/snapshot.c |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 3 | * |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 4 | * This file provides system snapshot/restore functionality for swsusp. |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 5 | * |
Pavel Machek | a253129 | 2010-07-18 14:27:13 +0200 | [diff] [blame] | 6 | * Copyright (C) 1998-2005 Pavel Machek <pavel@ucw.cz> |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 7 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 8 | * |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 9 | * This file is released under the GPLv2. |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 10 | * |
| 11 | */ |
| 12 | |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 13 | #include <linux/version.h> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 14 | #include <linux/module.h> |
| 15 | #include <linux/mm.h> |
| 16 | #include <linux/suspend.h> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 17 | #include <linux/delay.h> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 18 | #include <linux/bitops.h> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 19 | #include <linux/spinlock.h> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 20 | #include <linux/kernel.h> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 21 | #include <linux/pm.h> |
| 22 | #include <linux/device.h> |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 23 | #include <linux/init.h> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 24 | #include <linux/bootmem.h> |
| 25 | #include <linux/syscalls.h> |
| 26 | #include <linux/console.h> |
| 27 | #include <linux/highmem.h> |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 28 | #include <linux/list.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 29 | #include <linux/slab.h> |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 30 | #include <linux/compiler.h> |
Tina Ruchandani | db59760 | 2014-10-30 11:04:53 -0700 | [diff] [blame] | 31 | #include <linux/ktime.h> |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 32 | |
| 33 | #include <asm/uaccess.h> |
| 34 | #include <asm/mmu_context.h> |
| 35 | #include <asm/pgtable.h> |
| 36 | #include <asm/tlbflush.h> |
| 37 | #include <asm/io.h> |
| 38 | |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 39 | #include "power.h" |
| 40 | |
Rafael J. Wysocki | 4c0b6c1 | 2016-07-10 02:12:10 +0200 | [diff] [blame] | 41 | #ifdef CONFIG_DEBUG_RODATA |
| 42 | static bool hibernate_restore_protection; |
| 43 | static bool hibernate_restore_protection_active; |
| 44 | |
| 45 | void enable_restore_image_protection(void) |
| 46 | { |
| 47 | hibernate_restore_protection = true; |
| 48 | } |
| 49 | |
| 50 | static inline void hibernate_restore_protection_begin(void) |
| 51 | { |
| 52 | hibernate_restore_protection_active = hibernate_restore_protection; |
| 53 | } |
| 54 | |
| 55 | static inline void hibernate_restore_protection_end(void) |
| 56 | { |
| 57 | hibernate_restore_protection_active = false; |
| 58 | } |
| 59 | |
| 60 | static inline void hibernate_restore_protect_page(void *page_address) |
| 61 | { |
| 62 | if (hibernate_restore_protection_active) |
| 63 | set_memory_ro((unsigned long)page_address, 1); |
| 64 | } |
| 65 | |
| 66 | static inline void hibernate_restore_unprotect_page(void *page_address) |
| 67 | { |
| 68 | if (hibernate_restore_protection_active) |
| 69 | set_memory_rw((unsigned long)page_address, 1); |
| 70 | } |
| 71 | #else |
| 72 | static inline void hibernate_restore_protection_begin(void) {} |
| 73 | static inline void hibernate_restore_protection_end(void) {} |
| 74 | static inline void hibernate_restore_protect_page(void *page_address) {} |
| 75 | static inline void hibernate_restore_unprotect_page(void *page_address) {} |
| 76 | #endif /* CONFIG_DEBUG_RODATA */ |
| 77 | |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 78 | static int swsusp_page_is_free(struct page *); |
| 79 | static void swsusp_set_page_forbidden(struct page *); |
| 80 | static void swsusp_unset_page_forbidden(struct page *); |
| 81 | |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 82 | /* |
Rafael J. Wysocki | ddeb648 | 2011-05-15 11:38:48 +0200 | [diff] [blame] | 83 | * Number of bytes to reserve for memory allocations made by device drivers |
| 84 | * from their ->freeze() and ->freeze_noirq() callbacks so that they don't |
| 85 | * cause image creation to fail (tunable via /sys/power/reserved_size). |
| 86 | */ |
| 87 | unsigned long reserved_size; |
| 88 | |
| 89 | void __init hibernate_reserved_size_init(void) |
| 90 | { |
| 91 | reserved_size = SPARE_PAGES * PAGE_SIZE; |
| 92 | } |
| 93 | |
| 94 | /* |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 95 | * Preferred image size in bytes (tunable via /sys/power/image_size). |
Rafael J. Wysocki | 1c1be3a | 2011-05-15 11:39:48 +0200 | [diff] [blame] | 96 | * When it is set to N, swsusp will do its best to ensure the image |
| 97 | * size will not exceed N bytes, but if that is impossible, it will |
| 98 | * try to create the smallest image possible. |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 99 | */ |
Rafael J. Wysocki | ac5c24ec | 2010-09-20 19:44:56 +0200 | [diff] [blame] | 100 | unsigned long image_size; |
| 101 | |
| 102 | void __init hibernate_image_size_init(void) |
| 103 | { |
Rafael J. Wysocki | 1c1be3a | 2011-05-15 11:39:48 +0200 | [diff] [blame] | 104 | image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE; |
Rafael J. Wysocki | ac5c24ec | 2010-09-20 19:44:56 +0200 | [diff] [blame] | 105 | } |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 106 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 107 | /* |
| 108 | * List of PBEs needed for restoring the pages that were allocated before |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 109 | * the suspend and included in the suspend image, but have also been |
| 110 | * allocated by the "resume" kernel, so their contents cannot be written |
| 111 | * directly to their "original" page frames. |
| 112 | */ |
Rafael J. Wysocki | 75534b5 | 2006-09-25 23:32:52 -0700 | [diff] [blame] | 113 | struct pbe *restore_pblist; |
| 114 | |
Rafael J. Wysocki | 9c74448 | 2016-06-29 03:00:51 +0200 | [diff] [blame] | 115 | /* struct linked_page is used to build chains of pages */ |
| 116 | |
| 117 | #define LINKED_PAGE_DATA_SIZE (PAGE_SIZE - sizeof(void *)) |
| 118 | |
| 119 | struct linked_page { |
| 120 | struct linked_page *next; |
| 121 | char data[LINKED_PAGE_DATA_SIZE]; |
| 122 | } __packed; |
| 123 | |
| 124 | /* |
| 125 | * List of "safe" pages (ie. pages that were not used by the image kernel |
| 126 | * before hibernation) that may be used as temporary storage for image kernel |
| 127 | * memory contents. |
| 128 | */ |
| 129 | static struct linked_page *safe_pages_list; |
| 130 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 131 | /* Pointer to an auxiliary buffer (1 page) */ |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 132 | static void *buffer; |
Rafael J. Wysocki | 7088a5c | 2006-01-06 00:13:05 -0800 | [diff] [blame] | 133 | |
Rafael J. Wysocki | 0bcd888 | 2006-09-25 23:32:52 -0700 | [diff] [blame] | 134 | #define PG_ANY 0 |
| 135 | #define PG_SAFE 1 |
| 136 | #define PG_UNSAFE_CLEAR 1 |
| 137 | #define PG_UNSAFE_KEEP 0 |
| 138 | |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 139 | static unsigned int allocated_unsafe_pages; |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 140 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 141 | /** |
| 142 | * get_image_page - Allocate a page for a hibernation image. |
| 143 | * @gfp_mask: GFP mask for the allocation. |
| 144 | * @safe_needed: Get pages that were not used before hibernation (restore only) |
| 145 | * |
| 146 | * During image restoration, for storing the PBE list and the image data, we can |
| 147 | * only use memory pages that do not conflict with the pages used before |
| 148 | * hibernation. The "unsafe" pages have PageNosaveFree set and we count them |
| 149 | * using allocated_unsafe_pages. |
| 150 | * |
| 151 | * Each allocated image page is marked as PageNosave and PageNosaveFree so that |
| 152 | * swsusp_free() can release it. |
| 153 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 154 | static void *get_image_page(gfp_t gfp_mask, int safe_needed) |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 155 | { |
| 156 | void *res; |
| 157 | |
| 158 | res = (void *)get_zeroed_page(gfp_mask); |
| 159 | if (safe_needed) |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 160 | while (res && swsusp_page_is_free(virt_to_page(res))) { |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 161 | /* The page is unsafe, mark it for swsusp_free() */ |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 162 | swsusp_set_page_forbidden(virt_to_page(res)); |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 163 | allocated_unsafe_pages++; |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 164 | res = (void *)get_zeroed_page(gfp_mask); |
| 165 | } |
| 166 | if (res) { |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 167 | swsusp_set_page_forbidden(virt_to_page(res)); |
| 168 | swsusp_set_page_free(virt_to_page(res)); |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 169 | } |
| 170 | return res; |
| 171 | } |
| 172 | |
Rafael J. Wysocki | 9c74448 | 2016-06-29 03:00:51 +0200 | [diff] [blame] | 173 | static void *__get_safe_page(gfp_t gfp_mask) |
| 174 | { |
| 175 | if (safe_pages_list) { |
| 176 | void *ret = safe_pages_list; |
| 177 | |
| 178 | safe_pages_list = safe_pages_list->next; |
| 179 | memset(ret, 0, PAGE_SIZE); |
| 180 | return ret; |
| 181 | } |
| 182 | return get_image_page(gfp_mask, PG_SAFE); |
| 183 | } |
| 184 | |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 185 | unsigned long get_safe_page(gfp_t gfp_mask) |
| 186 | { |
Rafael J. Wysocki | 9c74448 | 2016-06-29 03:00:51 +0200 | [diff] [blame] | 187 | return (unsigned long)__get_safe_page(gfp_mask); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 188 | } |
| 189 | |
Rafael J. Wysocki | 5b6d15d | 2006-12-06 20:34:43 -0800 | [diff] [blame] | 190 | static struct page *alloc_image_page(gfp_t gfp_mask) |
| 191 | { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 192 | struct page *page; |
| 193 | |
| 194 | page = alloc_page(gfp_mask); |
| 195 | if (page) { |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 196 | swsusp_set_page_forbidden(page); |
| 197 | swsusp_set_page_free(page); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 198 | } |
| 199 | return page; |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 200 | } |
| 201 | |
Rafael J. Wysocki | 307c597 | 2016-06-29 03:05:10 +0200 | [diff] [blame] | 202 | static void recycle_safe_page(void *page_address) |
| 203 | { |
| 204 | struct linked_page *lp = page_address; |
| 205 | |
| 206 | lp->next = safe_pages_list; |
| 207 | safe_pages_list = lp; |
| 208 | } |
| 209 | |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 210 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 211 | * free_image_page - Free a page allocated for hibernation image. |
| 212 | * @addr: Address of the page to free. |
| 213 | * @clear_nosave_free: If set, clear the PageNosaveFree bit for the page. |
| 214 | * |
| 215 | * The page to free should have been allocated by get_image_page() (page flags |
| 216 | * set by it are affected). |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 217 | */ |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 218 | static inline void free_image_page(void *addr, int clear_nosave_free) |
| 219 | { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 220 | struct page *page; |
| 221 | |
| 222 | BUG_ON(!virt_addr_valid(addr)); |
| 223 | |
| 224 | page = virt_to_page(addr); |
| 225 | |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 226 | swsusp_unset_page_forbidden(page); |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 227 | if (clear_nosave_free) |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 228 | swsusp_unset_page_free(page); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 229 | |
| 230 | __free_page(page); |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 231 | } |
| 232 | |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 233 | static inline void free_list_of_pages(struct linked_page *list, |
| 234 | int clear_page_nosave) |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 235 | { |
| 236 | while (list) { |
| 237 | struct linked_page *lp = list->next; |
| 238 | |
| 239 | free_image_page(list, clear_page_nosave); |
| 240 | list = lp; |
| 241 | } |
| 242 | } |
| 243 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 244 | /* |
| 245 | * struct chain_allocator is used for allocating small objects out of |
| 246 | * a linked list of pages called 'the chain'. |
| 247 | * |
| 248 | * The chain grows each time when there is no room for a new object in |
| 249 | * the current page. The allocated objects cannot be freed individually. |
| 250 | * It is only possible to free them all at once, by freeing the entire |
| 251 | * chain. |
| 252 | * |
| 253 | * NOTE: The chain allocator may be inefficient if the allocated objects |
| 254 | * are not much smaller than PAGE_SIZE. |
| 255 | */ |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 256 | struct chain_allocator { |
| 257 | struct linked_page *chain; /* the chain */ |
| 258 | unsigned int used_space; /* total size of objects allocated out |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 259 | of the current page */ |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 260 | gfp_t gfp_mask; /* mask for allocating pages */ |
| 261 | int safe_needed; /* if set, only "safe" pages are allocated */ |
| 262 | }; |
| 263 | |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 264 | static void chain_init(struct chain_allocator *ca, gfp_t gfp_mask, |
| 265 | int safe_needed) |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 266 | { |
| 267 | ca->chain = NULL; |
| 268 | ca->used_space = LINKED_PAGE_DATA_SIZE; |
| 269 | ca->gfp_mask = gfp_mask; |
| 270 | ca->safe_needed = safe_needed; |
| 271 | } |
| 272 | |
| 273 | static void *chain_alloc(struct chain_allocator *ca, unsigned int size) |
| 274 | { |
| 275 | void *ret; |
| 276 | |
| 277 | if (LINKED_PAGE_DATA_SIZE - ca->used_space < size) { |
| 278 | struct linked_page *lp; |
| 279 | |
Rafael J. Wysocki | 9c74448 | 2016-06-29 03:00:51 +0200 | [diff] [blame] | 280 | lp = ca->safe_needed ? __get_safe_page(ca->gfp_mask) : |
| 281 | get_image_page(ca->gfp_mask, PG_ANY); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 282 | if (!lp) |
| 283 | return NULL; |
| 284 | |
| 285 | lp->next = ca->chain; |
| 286 | ca->chain = lp; |
| 287 | ca->used_space = 0; |
| 288 | } |
| 289 | ret = ca->chain->data + ca->used_space; |
| 290 | ca->used_space += size; |
| 291 | return ret; |
| 292 | } |
| 293 | |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 294 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 295 | * Data types related to memory bitmaps. |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 296 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 297 | * Memory bitmap is a structure consiting of many linked lists of |
| 298 | * objects. The main list's elements are of type struct zone_bitmap |
| 299 | * and each of them corresonds to one zone. For each zone bitmap |
| 300 | * object there is a list of objects of type struct bm_block that |
| 301 | * represent each blocks of bitmap in which information is stored. |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 302 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 303 | * struct memory_bitmap contains a pointer to the main list of zone |
| 304 | * bitmap objects, a struct bm_position used for browsing the bitmap, |
| 305 | * and a pointer to the list of pages used for allocating all of the |
| 306 | * zone bitmap objects and bitmap block objects. |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 307 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 308 | * NOTE: It has to be possible to lay out the bitmap in memory |
| 309 | * using only allocations of order 0. Additionally, the bitmap is |
| 310 | * designed to work with arbitrary number of zones (this is over the |
| 311 | * top for now, but let's avoid making unnecessary assumptions ;-). |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 312 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 313 | * struct zone_bitmap contains a pointer to a list of bitmap block |
| 314 | * objects and a pointer to the bitmap block object that has been |
| 315 | * most recently used for setting bits. Additionally, it contains the |
| 316 | * PFNs that correspond to the start and end of the represented zone. |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 317 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 318 | * struct bm_block contains a pointer to the memory page in which |
| 319 | * information is stored (in the form of a block of bitmap) |
| 320 | * It also contains the pfns that correspond to the start and end of |
| 321 | * the represented memory area. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 322 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 323 | * The memory bitmap is organized as a radix tree to guarantee fast random |
| 324 | * access to the bits. There is one radix tree for each zone (as returned |
| 325 | * from create_mem_extents). |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 326 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 327 | * One radix tree is represented by one struct mem_zone_bm_rtree. There are |
| 328 | * two linked lists for the nodes of the tree, one for the inner nodes and |
| 329 | * one for the leave nodes. The linked leave nodes are used for fast linear |
| 330 | * access of the memory bitmap. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 331 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 332 | * The struct rtree_node represents one node of the radix tree. |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 333 | */ |
| 334 | |
| 335 | #define BM_END_OF_MAP (~0UL) |
| 336 | |
Wu Fengguang | 8de0307 | 2009-07-22 19:56:10 +0200 | [diff] [blame] | 337 | #define BM_BITS_PER_BLOCK (PAGE_SIZE * BITS_PER_BYTE) |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 338 | #define BM_BLOCK_SHIFT (PAGE_SHIFT + 3) |
| 339 | #define BM_BLOCK_MASK ((1UL << BM_BLOCK_SHIFT) - 1) |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 340 | |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 341 | /* |
| 342 | * struct rtree_node is a wrapper struct to link the nodes |
| 343 | * of the rtree together for easy linear iteration over |
| 344 | * bits and easy freeing |
| 345 | */ |
| 346 | struct rtree_node { |
| 347 | struct list_head list; |
| 348 | unsigned long *data; |
| 349 | }; |
| 350 | |
| 351 | /* |
| 352 | * struct mem_zone_bm_rtree represents a bitmap used for one |
| 353 | * populated memory zone. |
| 354 | */ |
| 355 | struct mem_zone_bm_rtree { |
| 356 | struct list_head list; /* Link Zones together */ |
| 357 | struct list_head nodes; /* Radix Tree inner nodes */ |
| 358 | struct list_head leaves; /* Radix Tree leaves */ |
| 359 | unsigned long start_pfn; /* Zone start page frame */ |
| 360 | unsigned long end_pfn; /* Zone end page frame + 1 */ |
| 361 | struct rtree_node *rtree; /* Radix Tree Root */ |
| 362 | int levels; /* Number of Radix Tree Levels */ |
| 363 | unsigned int blocks; /* Number of Bitmap Blocks */ |
| 364 | }; |
| 365 | |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 366 | /* strcut bm_position is used for browsing memory bitmaps */ |
| 367 | |
| 368 | struct bm_position { |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 369 | struct mem_zone_bm_rtree *zone; |
| 370 | struct rtree_node *node; |
| 371 | unsigned long node_pfn; |
| 372 | int node_bit; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 373 | }; |
| 374 | |
| 375 | struct memory_bitmap { |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 376 | struct list_head zones; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 377 | struct linked_page *p_list; /* list of pages used to store zone |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 378 | bitmap objects and bitmap block |
| 379 | objects */ |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 380 | struct bm_position cur; /* most recently used bit position */ |
| 381 | }; |
| 382 | |
| 383 | /* Functions that operate on memory bitmaps */ |
| 384 | |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 385 | #define BM_ENTRIES_PER_LEVEL (PAGE_SIZE / sizeof(unsigned long)) |
| 386 | #if BITS_PER_LONG == 32 |
| 387 | #define BM_RTREE_LEVEL_SHIFT (PAGE_SHIFT - 2) |
| 388 | #else |
| 389 | #define BM_RTREE_LEVEL_SHIFT (PAGE_SHIFT - 3) |
| 390 | #endif |
| 391 | #define BM_RTREE_LEVEL_MASK ((1UL << BM_RTREE_LEVEL_SHIFT) - 1) |
| 392 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 393 | /** |
| 394 | * alloc_rtree_node - Allocate a new node and add it to the radix tree. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 395 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 396 | * This function is used to allocate inner nodes as well as the |
| 397 | * leave nodes of the radix tree. It also adds the node to the |
| 398 | * corresponding linked list passed in by the *list parameter. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 399 | */ |
| 400 | static struct rtree_node *alloc_rtree_node(gfp_t gfp_mask, int safe_needed, |
| 401 | struct chain_allocator *ca, |
| 402 | struct list_head *list) |
| 403 | { |
| 404 | struct rtree_node *node; |
| 405 | |
| 406 | node = chain_alloc(ca, sizeof(struct rtree_node)); |
| 407 | if (!node) |
| 408 | return NULL; |
| 409 | |
| 410 | node->data = get_image_page(gfp_mask, safe_needed); |
| 411 | if (!node->data) |
| 412 | return NULL; |
| 413 | |
| 414 | list_add_tail(&node->list, list); |
| 415 | |
| 416 | return node; |
| 417 | } |
| 418 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 419 | /** |
| 420 | * add_rtree_block - Add a new leave node to the radix tree. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 421 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 422 | * The leave nodes need to be allocated in order to keep the leaves |
| 423 | * linked list in order. This is guaranteed by the zone->blocks |
| 424 | * counter. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 425 | */ |
| 426 | static int add_rtree_block(struct mem_zone_bm_rtree *zone, gfp_t gfp_mask, |
| 427 | int safe_needed, struct chain_allocator *ca) |
| 428 | { |
| 429 | struct rtree_node *node, *block, **dst; |
| 430 | unsigned int levels_needed, block_nr; |
| 431 | int i; |
| 432 | |
| 433 | block_nr = zone->blocks; |
| 434 | levels_needed = 0; |
| 435 | |
| 436 | /* How many levels do we need for this block nr? */ |
| 437 | while (block_nr) { |
| 438 | levels_needed += 1; |
| 439 | block_nr >>= BM_RTREE_LEVEL_SHIFT; |
| 440 | } |
| 441 | |
| 442 | /* Make sure the rtree has enough levels */ |
| 443 | for (i = zone->levels; i < levels_needed; i++) { |
| 444 | node = alloc_rtree_node(gfp_mask, safe_needed, ca, |
| 445 | &zone->nodes); |
| 446 | if (!node) |
| 447 | return -ENOMEM; |
| 448 | |
| 449 | node->data[0] = (unsigned long)zone->rtree; |
| 450 | zone->rtree = node; |
| 451 | zone->levels += 1; |
| 452 | } |
| 453 | |
| 454 | /* Allocate new block */ |
| 455 | block = alloc_rtree_node(gfp_mask, safe_needed, ca, &zone->leaves); |
| 456 | if (!block) |
| 457 | return -ENOMEM; |
| 458 | |
| 459 | /* Now walk the rtree to insert the block */ |
| 460 | node = zone->rtree; |
| 461 | dst = &zone->rtree; |
| 462 | block_nr = zone->blocks; |
| 463 | for (i = zone->levels; i > 0; i--) { |
| 464 | int index; |
| 465 | |
| 466 | if (!node) { |
| 467 | node = alloc_rtree_node(gfp_mask, safe_needed, ca, |
| 468 | &zone->nodes); |
| 469 | if (!node) |
| 470 | return -ENOMEM; |
| 471 | *dst = node; |
| 472 | } |
| 473 | |
| 474 | index = block_nr >> ((i - 1) * BM_RTREE_LEVEL_SHIFT); |
| 475 | index &= BM_RTREE_LEVEL_MASK; |
| 476 | dst = (struct rtree_node **)&((*dst)->data[index]); |
| 477 | node = *dst; |
| 478 | } |
| 479 | |
| 480 | zone->blocks += 1; |
| 481 | *dst = block; |
| 482 | |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | static void free_zone_bm_rtree(struct mem_zone_bm_rtree *zone, |
| 487 | int clear_nosave_free); |
| 488 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 489 | /** |
| 490 | * create_zone_bm_rtree - Create a radix tree for one zone. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 491 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 492 | * Allocated the mem_zone_bm_rtree structure and initializes it. |
| 493 | * This function also allocated and builds the radix tree for the |
| 494 | * zone. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 495 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 496 | static struct mem_zone_bm_rtree *create_zone_bm_rtree(gfp_t gfp_mask, |
| 497 | int safe_needed, |
| 498 | struct chain_allocator *ca, |
| 499 | unsigned long start, |
| 500 | unsigned long end) |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 501 | { |
| 502 | struct mem_zone_bm_rtree *zone; |
| 503 | unsigned int i, nr_blocks; |
| 504 | unsigned long pages; |
| 505 | |
| 506 | pages = end - start; |
| 507 | zone = chain_alloc(ca, sizeof(struct mem_zone_bm_rtree)); |
| 508 | if (!zone) |
| 509 | return NULL; |
| 510 | |
| 511 | INIT_LIST_HEAD(&zone->nodes); |
| 512 | INIT_LIST_HEAD(&zone->leaves); |
| 513 | zone->start_pfn = start; |
| 514 | zone->end_pfn = end; |
| 515 | nr_blocks = DIV_ROUND_UP(pages, BM_BITS_PER_BLOCK); |
| 516 | |
| 517 | for (i = 0; i < nr_blocks; i++) { |
| 518 | if (add_rtree_block(zone, gfp_mask, safe_needed, ca)) { |
| 519 | free_zone_bm_rtree(zone, PG_UNSAFE_CLEAR); |
| 520 | return NULL; |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | return zone; |
| 525 | } |
| 526 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 527 | /** |
| 528 | * free_zone_bm_rtree - Free the memory of the radix tree. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 529 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 530 | * Free all node pages of the radix tree. The mem_zone_bm_rtree |
| 531 | * structure itself is not freed here nor are the rtree_node |
| 532 | * structs. |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 533 | */ |
| 534 | static void free_zone_bm_rtree(struct mem_zone_bm_rtree *zone, |
| 535 | int clear_nosave_free) |
| 536 | { |
| 537 | struct rtree_node *node; |
| 538 | |
| 539 | list_for_each_entry(node, &zone->nodes, list) |
| 540 | free_image_page(node->data, clear_nosave_free); |
| 541 | |
| 542 | list_for_each_entry(node, &zone->leaves, list) |
| 543 | free_image_page(node->data, clear_nosave_free); |
| 544 | } |
| 545 | |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 546 | static void memory_bm_position_reset(struct memory_bitmap *bm) |
| 547 | { |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 548 | bm->cur.zone = list_entry(bm->zones.next, struct mem_zone_bm_rtree, |
| 549 | list); |
| 550 | bm->cur.node = list_entry(bm->cur.zone->leaves.next, |
| 551 | struct rtree_node, list); |
| 552 | bm->cur.node_pfn = 0; |
| 553 | bm->cur.node_bit = 0; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 554 | } |
| 555 | |
| 556 | static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free); |
| 557 | |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 558 | struct mem_extent { |
| 559 | struct list_head hook; |
| 560 | unsigned long start; |
| 561 | unsigned long end; |
| 562 | }; |
| 563 | |
| 564 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 565 | * free_mem_extents - Free a list of memory extents. |
| 566 | * @list: List of extents to free. |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 567 | */ |
| 568 | static void free_mem_extents(struct list_head *list) |
| 569 | { |
| 570 | struct mem_extent *ext, *aux; |
| 571 | |
| 572 | list_for_each_entry_safe(ext, aux, list, hook) { |
| 573 | list_del(&ext->hook); |
| 574 | kfree(ext); |
| 575 | } |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 576 | } |
| 577 | |
| 578 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 579 | * create_mem_extents - Create a list of memory extents. |
| 580 | * @list: List to put the extents into. |
| 581 | * @gfp_mask: Mask to use for memory allocations. |
| 582 | * |
| 583 | * The extents represent contiguous ranges of PFNs. |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 584 | */ |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 585 | static int create_mem_extents(struct list_head *list, gfp_t gfp_mask) |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 586 | { |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 587 | struct zone *zone; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 588 | |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 589 | INIT_LIST_HEAD(list); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 590 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 591 | for_each_populated_zone(zone) { |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 592 | unsigned long zone_start, zone_end; |
| 593 | struct mem_extent *ext, *cur, *aux; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 594 | |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 595 | zone_start = zone->zone_start_pfn; |
Xishi Qiu | c33bc31 | 2013-09-11 14:21:44 -0700 | [diff] [blame] | 596 | zone_end = zone_end_pfn(zone); |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 597 | |
| 598 | list_for_each_entry(ext, list, hook) |
| 599 | if (zone_start <= ext->end) |
| 600 | break; |
| 601 | |
| 602 | if (&ext->hook == list || zone_end < ext->start) { |
| 603 | /* New extent is necessary */ |
| 604 | struct mem_extent *new_ext; |
| 605 | |
| 606 | new_ext = kzalloc(sizeof(struct mem_extent), gfp_mask); |
| 607 | if (!new_ext) { |
| 608 | free_mem_extents(list); |
| 609 | return -ENOMEM; |
| 610 | } |
| 611 | new_ext->start = zone_start; |
| 612 | new_ext->end = zone_end; |
| 613 | list_add_tail(&new_ext->hook, &ext->hook); |
| 614 | continue; |
| 615 | } |
| 616 | |
| 617 | /* Merge this zone's range of PFNs with the existing one */ |
| 618 | if (zone_start < ext->start) |
| 619 | ext->start = zone_start; |
| 620 | if (zone_end > ext->end) |
| 621 | ext->end = zone_end; |
| 622 | |
| 623 | /* More merging may be possible */ |
| 624 | cur = ext; |
| 625 | list_for_each_entry_safe_continue(cur, aux, list, hook) { |
| 626 | if (zone_end < cur->start) |
| 627 | break; |
| 628 | if (zone_end < cur->end) |
| 629 | ext->end = cur->end; |
| 630 | list_del(&cur->hook); |
| 631 | kfree(cur); |
| 632 | } |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 633 | } |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 634 | |
| 635 | return 0; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 636 | } |
| 637 | |
| 638 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 639 | * memory_bm_create - Allocate memory for a memory bitmap. |
| 640 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 641 | static int memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask, |
| 642 | int safe_needed) |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 643 | { |
| 644 | struct chain_allocator ca; |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 645 | struct list_head mem_extents; |
| 646 | struct mem_extent *ext; |
| 647 | int error; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 648 | |
| 649 | chain_init(&ca, gfp_mask, safe_needed); |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 650 | INIT_LIST_HEAD(&bm->zones); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 651 | |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 652 | error = create_mem_extents(&mem_extents, gfp_mask); |
| 653 | if (error) |
| 654 | return error; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 655 | |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 656 | list_for_each_entry(ext, &mem_extents, hook) { |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 657 | struct mem_zone_bm_rtree *zone; |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 658 | |
| 659 | zone = create_zone_bm_rtree(gfp_mask, safe_needed, &ca, |
| 660 | ext->start, ext->end); |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 661 | if (!zone) { |
| 662 | error = -ENOMEM; |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 663 | goto Error; |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 664 | } |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 665 | list_add_tail(&zone->list, &bm->zones); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 666 | } |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 667 | |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 668 | bm->p_list = ca.chain; |
| 669 | memory_bm_position_reset(bm); |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 670 | Exit: |
| 671 | free_mem_extents(&mem_extents); |
| 672 | return error; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 673 | |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 674 | Error: |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 675 | bm->p_list = ca.chain; |
| 676 | memory_bm_free(bm, PG_UNSAFE_CLEAR); |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 677 | goto Exit; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 681 | * memory_bm_free - Free memory occupied by the memory bitmap. |
| 682 | * @bm: Memory bitmap. |
| 683 | */ |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 684 | static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free) |
| 685 | { |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 686 | struct mem_zone_bm_rtree *zone; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 687 | |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 688 | list_for_each_entry(zone, &bm->zones, list) |
| 689 | free_zone_bm_rtree(zone, clear_nosave_free); |
| 690 | |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 691 | free_list_of_pages(bm->p_list, clear_nosave_free); |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 692 | |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 693 | INIT_LIST_HEAD(&bm->zones); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 694 | } |
| 695 | |
| 696 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 697 | * memory_bm_find_bit - Find the bit for a given PFN in a memory bitmap. |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 698 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 699 | * Find the bit in memory bitmap @bm that corresponds to the given PFN. |
| 700 | * The cur.zone, cur.block and cur.node_pfn members of @bm are updated. |
| 701 | * |
| 702 | * Walk the radix tree to find the page containing the bit that represents @pfn |
| 703 | * and return the position of the bit in @addr and @bit_nr. |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 704 | */ |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 705 | static int memory_bm_find_bit(struct memory_bitmap *bm, unsigned long pfn, |
| 706 | void **addr, unsigned int *bit_nr) |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 707 | { |
| 708 | struct mem_zone_bm_rtree *curr, *zone; |
| 709 | struct rtree_node *node; |
| 710 | int i, block_nr; |
| 711 | |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 712 | zone = bm->cur.zone; |
| 713 | |
| 714 | if (pfn >= zone->start_pfn && pfn < zone->end_pfn) |
| 715 | goto zone_found; |
| 716 | |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 717 | zone = NULL; |
| 718 | |
| 719 | /* Find the right zone */ |
| 720 | list_for_each_entry(curr, &bm->zones, list) { |
| 721 | if (pfn >= curr->start_pfn && pfn < curr->end_pfn) { |
| 722 | zone = curr; |
| 723 | break; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | if (!zone) |
| 728 | return -EFAULT; |
| 729 | |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 730 | zone_found: |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 731 | /* |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 732 | * We have found the zone. Now walk the radix tree to find the leaf node |
| 733 | * for our PFN. |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 734 | */ |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 735 | node = bm->cur.node; |
| 736 | if (((pfn - zone->start_pfn) & ~BM_BLOCK_MASK) == bm->cur.node_pfn) |
| 737 | goto node_found; |
| 738 | |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 739 | node = zone->rtree; |
| 740 | block_nr = (pfn - zone->start_pfn) >> BM_BLOCK_SHIFT; |
| 741 | |
| 742 | for (i = zone->levels; i > 0; i--) { |
| 743 | int index; |
| 744 | |
| 745 | index = block_nr >> ((i - 1) * BM_RTREE_LEVEL_SHIFT); |
| 746 | index &= BM_RTREE_LEVEL_MASK; |
| 747 | BUG_ON(node->data[index] == 0); |
| 748 | node = (struct rtree_node *)node->data[index]; |
| 749 | } |
| 750 | |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 751 | node_found: |
| 752 | /* Update last position */ |
| 753 | bm->cur.zone = zone; |
| 754 | bm->cur.node = node; |
| 755 | bm->cur.node_pfn = (pfn - zone->start_pfn) & ~BM_BLOCK_MASK; |
| 756 | |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 757 | /* Set return values */ |
| 758 | *addr = node->data; |
| 759 | *bit_nr = (pfn - zone->start_pfn) & BM_BLOCK_MASK; |
| 760 | |
| 761 | return 0; |
| 762 | } |
| 763 | |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 764 | static void memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn) |
| 765 | { |
| 766 | void *addr; |
| 767 | unsigned int bit; |
Rafael J. Wysocki | a82f711 | 2008-03-12 00:34:57 +0100 | [diff] [blame] | 768 | int error; |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 769 | |
Rafael J. Wysocki | a82f711 | 2008-03-12 00:34:57 +0100 | [diff] [blame] | 770 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
| 771 | BUG_ON(error); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 772 | set_bit(bit, addr); |
| 773 | } |
| 774 | |
Rafael J. Wysocki | a82f711 | 2008-03-12 00:34:57 +0100 | [diff] [blame] | 775 | static int mem_bm_set_bit_check(struct memory_bitmap *bm, unsigned long pfn) |
| 776 | { |
| 777 | void *addr; |
| 778 | unsigned int bit; |
| 779 | int error; |
| 780 | |
| 781 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
| 782 | if (!error) |
| 783 | set_bit(bit, addr); |
Joerg Roedel | 07a3382 | 2014-07-21 12:26:58 +0200 | [diff] [blame] | 784 | |
Rafael J. Wysocki | a82f711 | 2008-03-12 00:34:57 +0100 | [diff] [blame] | 785 | return error; |
| 786 | } |
| 787 | |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 788 | static void memory_bm_clear_bit(struct memory_bitmap *bm, unsigned long pfn) |
| 789 | { |
| 790 | void *addr; |
| 791 | unsigned int bit; |
Rafael J. Wysocki | a82f711 | 2008-03-12 00:34:57 +0100 | [diff] [blame] | 792 | int error; |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 793 | |
Rafael J. Wysocki | a82f711 | 2008-03-12 00:34:57 +0100 | [diff] [blame] | 794 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
| 795 | BUG_ON(error); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 796 | clear_bit(bit, addr); |
| 797 | } |
| 798 | |
Joerg Roedel | fdd64ed | 2014-09-30 13:31:29 +0200 | [diff] [blame] | 799 | static void memory_bm_clear_current(struct memory_bitmap *bm) |
| 800 | { |
| 801 | int bit; |
| 802 | |
| 803 | bit = max(bm->cur.node_bit - 1, 0); |
| 804 | clear_bit(bit, bm->cur.node->data); |
| 805 | } |
| 806 | |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 807 | static int memory_bm_test_bit(struct memory_bitmap *bm, unsigned long pfn) |
| 808 | { |
| 809 | void *addr; |
| 810 | unsigned int bit; |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 811 | int error; |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 812 | |
Rafael J. Wysocki | a82f711 | 2008-03-12 00:34:57 +0100 | [diff] [blame] | 813 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
| 814 | BUG_ON(error); |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 815 | return test_bit(bit, addr); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 816 | } |
| 817 | |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 818 | static bool memory_bm_pfn_present(struct memory_bitmap *bm, unsigned long pfn) |
| 819 | { |
| 820 | void *addr; |
| 821 | unsigned int bit; |
| 822 | |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 823 | return !memory_bm_find_bit(bm, pfn, &addr, &bit); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 824 | } |
| 825 | |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 826 | /* |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 827 | * rtree_next_node - Jump to the next leaf node. |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 828 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 829 | * Set the position to the beginning of the next node in the |
| 830 | * memory bitmap. This is either the next node in the current |
| 831 | * zone's radix tree or the first node in the radix tree of the |
| 832 | * next zone. |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 833 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 834 | * Return true if there is a next node, false otherwise. |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 835 | */ |
| 836 | static bool rtree_next_node(struct memory_bitmap *bm) |
| 837 | { |
James Morse | 924d869 | 2016-08-16 10:46:38 +0100 | [diff] [blame] | 838 | if (!list_is_last(&bm->cur.node->list, &bm->cur.zone->leaves)) { |
| 839 | bm->cur.node = list_entry(bm->cur.node->list.next, |
| 840 | struct rtree_node, list); |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 841 | bm->cur.node_pfn += BM_BITS_PER_BLOCK; |
| 842 | bm->cur.node_bit = 0; |
Joerg Roedel | 0f7d83e | 2014-07-21 12:27:02 +0200 | [diff] [blame] | 843 | touch_softlockup_watchdog(); |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 844 | return true; |
| 845 | } |
| 846 | |
| 847 | /* No more nodes, goto next zone */ |
James Morse | 924d869 | 2016-08-16 10:46:38 +0100 | [diff] [blame] | 848 | if (!list_is_last(&bm->cur.zone->list, &bm->zones)) { |
| 849 | bm->cur.zone = list_entry(bm->cur.zone->list.next, |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 850 | struct mem_zone_bm_rtree, list); |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 851 | bm->cur.node = list_entry(bm->cur.zone->leaves.next, |
| 852 | struct rtree_node, list); |
| 853 | bm->cur.node_pfn = 0; |
| 854 | bm->cur.node_bit = 0; |
| 855 | return true; |
| 856 | } |
| 857 | |
| 858 | /* No more zones */ |
| 859 | return false; |
| 860 | } |
| 861 | |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 862 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 863 | * memory_bm_rtree_next_pfn - Find the next set bit in a memory bitmap. |
| 864 | * @bm: Memory bitmap. |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 865 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 866 | * Starting from the last returned position this function searches for the next |
| 867 | * set bit in @bm and returns the PFN represented by it. If no more bits are |
| 868 | * set, BM_END_OF_MAP is returned. |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 869 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 870 | * It is required to run memory_bm_position_reset() before the first call to |
| 871 | * this function for the given memory bitmap. |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 872 | */ |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 873 | static unsigned long memory_bm_next_pfn(struct memory_bitmap *bm) |
Joerg Roedel | 3a20cb1 | 2014-07-21 12:26:59 +0200 | [diff] [blame] | 874 | { |
| 875 | unsigned long bits, pfn, pages; |
| 876 | int bit; |
| 877 | |
| 878 | do { |
| 879 | pages = bm->cur.zone->end_pfn - bm->cur.zone->start_pfn; |
| 880 | bits = min(pages - bm->cur.node_pfn, BM_BITS_PER_BLOCK); |
| 881 | bit = find_next_bit(bm->cur.node->data, bits, |
| 882 | bm->cur.node_bit); |
| 883 | if (bit < bits) { |
| 884 | pfn = bm->cur.zone->start_pfn + bm->cur.node_pfn + bit; |
| 885 | bm->cur.node_bit = bit + 1; |
| 886 | return pfn; |
| 887 | } |
| 888 | } while (rtree_next_node(bm)); |
| 889 | |
| 890 | return BM_END_OF_MAP; |
| 891 | } |
| 892 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 893 | /* |
| 894 | * This structure represents a range of page frames the contents of which |
| 895 | * should not be saved during hibernation. |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 896 | */ |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 897 | struct nosave_region { |
| 898 | struct list_head list; |
| 899 | unsigned long start_pfn; |
| 900 | unsigned long end_pfn; |
| 901 | }; |
| 902 | |
| 903 | static LIST_HEAD(nosave_regions); |
| 904 | |
Rafael J. Wysocki | 307c597 | 2016-06-29 03:05:10 +0200 | [diff] [blame] | 905 | static void recycle_zone_bm_rtree(struct mem_zone_bm_rtree *zone) |
| 906 | { |
| 907 | struct rtree_node *node; |
| 908 | |
| 909 | list_for_each_entry(node, &zone->nodes, list) |
| 910 | recycle_safe_page(node->data); |
| 911 | |
| 912 | list_for_each_entry(node, &zone->leaves, list) |
| 913 | recycle_safe_page(node->data); |
| 914 | } |
| 915 | |
| 916 | static void memory_bm_recycle(struct memory_bitmap *bm) |
| 917 | { |
| 918 | struct mem_zone_bm_rtree *zone; |
| 919 | struct linked_page *p_list; |
| 920 | |
| 921 | list_for_each_entry(zone, &bm->zones, list) |
| 922 | recycle_zone_bm_rtree(zone); |
| 923 | |
| 924 | p_list = bm->p_list; |
| 925 | while (p_list) { |
| 926 | struct linked_page *lp = p_list; |
| 927 | |
| 928 | p_list = lp->next; |
| 929 | recycle_safe_page(lp); |
| 930 | } |
| 931 | } |
| 932 | |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 933 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 934 | * register_nosave_region - Register a region of unsaveable memory. |
| 935 | * |
| 936 | * Register a range of page frames the contents of which should not be saved |
| 937 | * during hibernation (to be used in the early initialization code). |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 938 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 939 | void __init __register_nosave_region(unsigned long start_pfn, |
| 940 | unsigned long end_pfn, int use_kmalloc) |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 941 | { |
| 942 | struct nosave_region *region; |
| 943 | |
| 944 | if (start_pfn >= end_pfn) |
| 945 | return; |
| 946 | |
| 947 | if (!list_empty(&nosave_regions)) { |
| 948 | /* Try to extend the previous region (they should be sorted) */ |
| 949 | region = list_entry(nosave_regions.prev, |
| 950 | struct nosave_region, list); |
| 951 | if (region->end_pfn == start_pfn) { |
| 952 | region->end_pfn = end_pfn; |
| 953 | goto Report; |
| 954 | } |
| 955 | } |
Johannes Berg | 940d67f | 2007-05-08 19:23:49 +1000 | [diff] [blame] | 956 | if (use_kmalloc) { |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 957 | /* During init, this shouldn't fail */ |
Johannes Berg | 940d67f | 2007-05-08 19:23:49 +1000 | [diff] [blame] | 958 | region = kmalloc(sizeof(struct nosave_region), GFP_KERNEL); |
| 959 | BUG_ON(!region); |
Rafael J. Wysocki | d5f32af | 2016-07-06 23:44:31 +0200 | [diff] [blame] | 960 | } else { |
Johannes Berg | 940d67f | 2007-05-08 19:23:49 +1000 | [diff] [blame] | 961 | /* This allocation cannot fail */ |
Santosh Shilimkar | c2f69cd | 2014-01-21 15:50:27 -0800 | [diff] [blame] | 962 | region = memblock_virt_alloc(sizeof(struct nosave_region), 0); |
Rafael J. Wysocki | d5f32af | 2016-07-06 23:44:31 +0200 | [diff] [blame] | 963 | } |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 964 | region->start_pfn = start_pfn; |
| 965 | region->end_pfn = end_pfn; |
| 966 | list_add_tail(®ion->list, &nosave_regions); |
| 967 | Report: |
Bjorn Helgaas | cd38ca8 | 2013-06-03 18:20:29 +0000 | [diff] [blame] | 968 | printk(KERN_INFO "PM: Registered nosave memory: [mem %#010llx-%#010llx]\n", |
| 969 | (unsigned long long) start_pfn << PAGE_SHIFT, |
| 970 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 971 | } |
| 972 | |
| 973 | /* |
| 974 | * Set bits in this map correspond to the page frames the contents of which |
| 975 | * should not be saved during the suspend. |
| 976 | */ |
| 977 | static struct memory_bitmap *forbidden_pages_map; |
| 978 | |
| 979 | /* Set bits in this map correspond to free page frames. */ |
| 980 | static struct memory_bitmap *free_pages_map; |
| 981 | |
| 982 | /* |
| 983 | * Each page frame allocated for creating the image is marked by setting the |
| 984 | * corresponding bits in forbidden_pages_map and free_pages_map simultaneously |
| 985 | */ |
| 986 | |
| 987 | void swsusp_set_page_free(struct page *page) |
| 988 | { |
| 989 | if (free_pages_map) |
| 990 | memory_bm_set_bit(free_pages_map, page_to_pfn(page)); |
| 991 | } |
| 992 | |
| 993 | static int swsusp_page_is_free(struct page *page) |
| 994 | { |
| 995 | return free_pages_map ? |
| 996 | memory_bm_test_bit(free_pages_map, page_to_pfn(page)) : 0; |
| 997 | } |
| 998 | |
| 999 | void swsusp_unset_page_free(struct page *page) |
| 1000 | { |
| 1001 | if (free_pages_map) |
| 1002 | memory_bm_clear_bit(free_pages_map, page_to_pfn(page)); |
| 1003 | } |
| 1004 | |
| 1005 | static void swsusp_set_page_forbidden(struct page *page) |
| 1006 | { |
| 1007 | if (forbidden_pages_map) |
| 1008 | memory_bm_set_bit(forbidden_pages_map, page_to_pfn(page)); |
| 1009 | } |
| 1010 | |
| 1011 | int swsusp_page_is_forbidden(struct page *page) |
| 1012 | { |
| 1013 | return forbidden_pages_map ? |
| 1014 | memory_bm_test_bit(forbidden_pages_map, page_to_pfn(page)) : 0; |
| 1015 | } |
| 1016 | |
| 1017 | static void swsusp_unset_page_forbidden(struct page *page) |
| 1018 | { |
| 1019 | if (forbidden_pages_map) |
| 1020 | memory_bm_clear_bit(forbidden_pages_map, page_to_pfn(page)); |
| 1021 | } |
| 1022 | |
| 1023 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1024 | * mark_nosave_pages - Mark pages that should not be saved. |
| 1025 | * @bm: Memory bitmap. |
| 1026 | * |
| 1027 | * Set the bits in @bm that correspond to the page frames the contents of which |
| 1028 | * should not be saved. |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1029 | */ |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1030 | static void mark_nosave_pages(struct memory_bitmap *bm) |
| 1031 | { |
| 1032 | struct nosave_region *region; |
| 1033 | |
| 1034 | if (list_empty(&nosave_regions)) |
| 1035 | return; |
| 1036 | |
| 1037 | list_for_each_entry(region, &nosave_regions, list) { |
| 1038 | unsigned long pfn; |
| 1039 | |
Bjorn Helgaas | 69f1d47 | 2012-02-14 22:20:52 +0100 | [diff] [blame] | 1040 | pr_debug("PM: Marking nosave pages: [mem %#010llx-%#010llx]\n", |
| 1041 | (unsigned long long) region->start_pfn << PAGE_SHIFT, |
| 1042 | ((unsigned long long) region->end_pfn << PAGE_SHIFT) |
| 1043 | - 1); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1044 | |
| 1045 | for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++) |
Rafael J. Wysocki | a82f711 | 2008-03-12 00:34:57 +0100 | [diff] [blame] | 1046 | if (pfn_valid(pfn)) { |
| 1047 | /* |
| 1048 | * It is safe to ignore the result of |
| 1049 | * mem_bm_set_bit_check() here, since we won't |
| 1050 | * touch the PFNs for which the error is |
| 1051 | * returned anyway. |
| 1052 | */ |
| 1053 | mem_bm_set_bit_check(bm, pfn); |
| 1054 | } |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1055 | } |
| 1056 | } |
| 1057 | |
| 1058 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1059 | * create_basic_memory_bitmaps - Create bitmaps to hold basic page information. |
| 1060 | * |
| 1061 | * Create bitmaps needed for marking page frames that should not be saved and |
| 1062 | * free page frames. The forbidden_pages_map and free_pages_map pointers are |
| 1063 | * only modified if everything goes well, because we don't want the bits to be |
| 1064 | * touched before both bitmaps are set up. |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1065 | */ |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1066 | int create_basic_memory_bitmaps(void) |
| 1067 | { |
| 1068 | struct memory_bitmap *bm1, *bm2; |
| 1069 | int error = 0; |
| 1070 | |
Rafael J. Wysocki | aab1728 | 2013-09-30 19:40:56 +0200 | [diff] [blame] | 1071 | if (forbidden_pages_map && free_pages_map) |
| 1072 | return 0; |
| 1073 | else |
| 1074 | BUG_ON(forbidden_pages_map || free_pages_map); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1075 | |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 1076 | bm1 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1077 | if (!bm1) |
| 1078 | return -ENOMEM; |
| 1079 | |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 1080 | error = memory_bm_create(bm1, GFP_KERNEL, PG_ANY); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1081 | if (error) |
| 1082 | goto Free_first_object; |
| 1083 | |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 1084 | bm2 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1085 | if (!bm2) |
| 1086 | goto Free_first_bitmap; |
| 1087 | |
Rafael J. Wysocki | 0709db6 | 2007-05-06 14:50:45 -0700 | [diff] [blame] | 1088 | error = memory_bm_create(bm2, GFP_KERNEL, PG_ANY); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1089 | if (error) |
| 1090 | goto Free_second_object; |
| 1091 | |
| 1092 | forbidden_pages_map = bm1; |
| 1093 | free_pages_map = bm2; |
| 1094 | mark_nosave_pages(forbidden_pages_map); |
| 1095 | |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1096 | pr_debug("PM: Basic memory bitmaps created\n"); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1097 | |
| 1098 | return 0; |
| 1099 | |
| 1100 | Free_second_object: |
| 1101 | kfree(bm2); |
| 1102 | Free_first_bitmap: |
| 1103 | memory_bm_free(bm1, PG_UNSAFE_CLEAR); |
| 1104 | Free_first_object: |
| 1105 | kfree(bm1); |
| 1106 | return -ENOMEM; |
| 1107 | } |
| 1108 | |
| 1109 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1110 | * free_basic_memory_bitmaps - Free memory bitmaps holding basic information. |
| 1111 | * |
| 1112 | * Free memory bitmaps allocated by create_basic_memory_bitmaps(). The |
| 1113 | * auxiliary pointers are necessary so that the bitmaps themselves are not |
| 1114 | * referred to while they are being freed. |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1115 | */ |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1116 | void free_basic_memory_bitmaps(void) |
| 1117 | { |
| 1118 | struct memory_bitmap *bm1, *bm2; |
| 1119 | |
Rafael J. Wysocki | 6a0c7cd | 2013-11-14 23:26:58 +0100 | [diff] [blame] | 1120 | if (WARN_ON(!(forbidden_pages_map && free_pages_map))) |
| 1121 | return; |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1122 | |
| 1123 | bm1 = forbidden_pages_map; |
| 1124 | bm2 = free_pages_map; |
| 1125 | forbidden_pages_map = NULL; |
| 1126 | free_pages_map = NULL; |
| 1127 | memory_bm_free(bm1, PG_UNSAFE_CLEAR); |
| 1128 | kfree(bm1); |
| 1129 | memory_bm_free(bm2, PG_UNSAFE_CLEAR); |
| 1130 | kfree(bm2); |
| 1131 | |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1132 | pr_debug("PM: Basic memory bitmaps freed\n"); |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1133 | } |
| 1134 | |
Anisse Astier | 1ad1410 | 2016-09-09 10:43:32 +0200 | [diff] [blame] | 1135 | void clear_free_pages(void) |
| 1136 | { |
| 1137 | #ifdef CONFIG_PAGE_POISONING_ZERO |
| 1138 | struct memory_bitmap *bm = free_pages_map; |
| 1139 | unsigned long pfn; |
| 1140 | |
| 1141 | if (WARN_ON(!(free_pages_map))) |
| 1142 | return; |
| 1143 | |
| 1144 | memory_bm_position_reset(bm); |
| 1145 | pfn = memory_bm_next_pfn(bm); |
| 1146 | while (pfn != BM_END_OF_MAP) { |
| 1147 | if (pfn_valid(pfn)) |
| 1148 | clear_highpage(pfn_to_page(pfn)); |
| 1149 | |
| 1150 | pfn = memory_bm_next_pfn(bm); |
| 1151 | } |
| 1152 | memory_bm_position_reset(bm); |
| 1153 | pr_info("PM: free pages cleared after restore\n"); |
| 1154 | #endif /* PAGE_POISONING_ZERO */ |
| 1155 | } |
| 1156 | |
Rafael J. Wysocki | 74dfd66 | 2007-05-06 14:50:43 -0700 | [diff] [blame] | 1157 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1158 | * snapshot_additional_pages - Estimate the number of extra pages needed. |
| 1159 | * @zone: Memory zone to carry out the computation for. |
| 1160 | * |
| 1161 | * Estimate the number of additional pages needed for setting up a hibernation |
| 1162 | * image data structures for @zone (usually, the returned value is greater than |
| 1163 | * the exact number). |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1164 | */ |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1165 | unsigned int snapshot_additional_pages(struct zone *zone) |
| 1166 | { |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 1167 | unsigned int rtree, nodes; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1168 | |
Joerg Roedel | f469f02 | 2014-07-21 12:26:57 +0200 | [diff] [blame] | 1169 | rtree = nodes = DIV_ROUND_UP(zone->spanned_pages, BM_BITS_PER_BLOCK); |
| 1170 | rtree += DIV_ROUND_UP(rtree * sizeof(struct rtree_node), |
| 1171 | LINKED_PAGE_DATA_SIZE); |
| 1172 | while (nodes > 1) { |
| 1173 | nodes = DIV_ROUND_UP(nodes, BM_ENTRIES_PER_LEVEL); |
| 1174 | rtree += nodes; |
| 1175 | } |
| 1176 | |
Joerg Roedel | 9047eb6 | 2014-07-21 12:27:01 +0200 | [diff] [blame] | 1177 | return 2 * rtree; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1178 | } |
| 1179 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1180 | #ifdef CONFIG_HIGHMEM |
| 1181 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1182 | * count_free_highmem_pages - Compute the total number of free highmem pages. |
| 1183 | * |
| 1184 | * The returned number is system-wide. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1185 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1186 | static unsigned int count_free_highmem_pages(void) |
| 1187 | { |
| 1188 | struct zone *zone; |
| 1189 | unsigned int cnt = 0; |
| 1190 | |
KOSAKI Motohiro | ee99c71 | 2009-03-31 15:19:31 -0700 | [diff] [blame] | 1191 | for_each_populated_zone(zone) |
| 1192 | if (is_highmem(zone)) |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 1193 | cnt += zone_page_state(zone, NR_FREE_PAGES); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1194 | |
| 1195 | return cnt; |
| 1196 | } |
| 1197 | |
| 1198 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1199 | * saveable_highmem_page - Check if a highmem page is saveable. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1200 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1201 | * Determine whether a highmem page should be included in a hibernation image. |
| 1202 | * |
| 1203 | * We should save the page if it isn't Nosave or NosaveFree, or Reserved, |
| 1204 | * and it isn't part of a free chunk of pages. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1205 | */ |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1206 | static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1207 | { |
| 1208 | struct page *page; |
| 1209 | |
| 1210 | if (!pfn_valid(pfn)) |
| 1211 | return NULL; |
| 1212 | |
| 1213 | page = pfn_to_page(pfn); |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1214 | if (page_zone(page) != zone) |
| 1215 | return NULL; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1216 | |
| 1217 | BUG_ON(!PageHighMem(page)); |
| 1218 | |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 1219 | if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page) || |
| 1220 | PageReserved(page)) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1221 | return NULL; |
| 1222 | |
Stanislaw Gruszka | c6968e7 | 2012-01-10 15:07:31 -0800 | [diff] [blame] | 1223 | if (page_is_guard(page)) |
| 1224 | return NULL; |
| 1225 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1226 | return page; |
| 1227 | } |
| 1228 | |
| 1229 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1230 | * count_highmem_pages - Compute the total number of saveable highmem pages. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1231 | */ |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1232 | static unsigned int count_highmem_pages(void) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1233 | { |
| 1234 | struct zone *zone; |
| 1235 | unsigned int n = 0; |
| 1236 | |
Gerald Schaefer | 98e73dc | 2009-07-22 00:36:56 +0200 | [diff] [blame] | 1237 | for_each_populated_zone(zone) { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1238 | unsigned long pfn, max_zone_pfn; |
| 1239 | |
| 1240 | if (!is_highmem(zone)) |
| 1241 | continue; |
| 1242 | |
| 1243 | mark_free_pages(zone); |
Xishi Qiu | c33bc31 | 2013-09-11 14:21:44 -0700 | [diff] [blame] | 1244 | max_zone_pfn = zone_end_pfn(zone); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1245 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1246 | if (saveable_highmem_page(zone, pfn)) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1247 | n++; |
| 1248 | } |
| 1249 | return n; |
| 1250 | } |
| 1251 | #else |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1252 | static inline void *saveable_highmem_page(struct zone *z, unsigned long p) |
| 1253 | { |
| 1254 | return NULL; |
| 1255 | } |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1256 | #endif /* CONFIG_HIGHMEM */ |
| 1257 | |
Rafael J. Wysocki | f6143aa | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 1258 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1259 | * saveable_page - Check if the given page is saveable. |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1260 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1261 | * Determine whether a non-highmem page should be included in a hibernation |
| 1262 | * image. |
| 1263 | * |
| 1264 | * We should save the page if it isn't Nosave, and is not in the range |
| 1265 | * of pages statically defined as 'unsaveable', and it isn't part of |
| 1266 | * a free chunk of pages. |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1267 | */ |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1268 | static struct page *saveable_page(struct zone *zone, unsigned long pfn) |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1269 | { |
Pavel Machek | de49186 | 2005-10-30 14:59:59 -0800 | [diff] [blame] | 1270 | struct page *page; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1271 | |
| 1272 | if (!pfn_valid(pfn)) |
Rafael J. Wysocki | ae83c5ee | 2006-09-25 23:32:45 -0700 | [diff] [blame] | 1273 | return NULL; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1274 | |
| 1275 | page = pfn_to_page(pfn); |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1276 | if (page_zone(page) != zone) |
| 1277 | return NULL; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1278 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1279 | BUG_ON(PageHighMem(page)); |
| 1280 | |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 1281 | if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page)) |
Rafael J. Wysocki | ae83c5ee | 2006-09-25 23:32:45 -0700 | [diff] [blame] | 1282 | return NULL; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1283 | |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1284 | if (PageReserved(page) |
| 1285 | && (!kernel_page_present(page) || pfn_is_nosave(pfn))) |
Rafael J. Wysocki | ae83c5ee | 2006-09-25 23:32:45 -0700 | [diff] [blame] | 1286 | return NULL; |
Rafael J. Wysocki | ae83c5ee | 2006-09-25 23:32:45 -0700 | [diff] [blame] | 1287 | |
Stanislaw Gruszka | c6968e7 | 2012-01-10 15:07:31 -0800 | [diff] [blame] | 1288 | if (page_is_guard(page)) |
| 1289 | return NULL; |
| 1290 | |
Rafael J. Wysocki | ae83c5ee | 2006-09-25 23:32:45 -0700 | [diff] [blame] | 1291 | return page; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1292 | } |
| 1293 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1294 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1295 | * count_data_pages - Compute the total number of saveable non-highmem pages. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1296 | */ |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1297 | static unsigned int count_data_pages(void) |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1298 | { |
| 1299 | struct zone *zone; |
Rafael J. Wysocki | ae83c5ee | 2006-09-25 23:32:45 -0700 | [diff] [blame] | 1300 | unsigned long pfn, max_zone_pfn; |
Pavel Machek | dc19d50 | 2005-11-07 00:58:40 -0800 | [diff] [blame] | 1301 | unsigned int n = 0; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1302 | |
Gerald Schaefer | 98e73dc | 2009-07-22 00:36:56 +0200 | [diff] [blame] | 1303 | for_each_populated_zone(zone) { |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1304 | if (is_highmem(zone)) |
| 1305 | continue; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1306 | |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1307 | mark_free_pages(zone); |
Xishi Qiu | c33bc31 | 2013-09-11 14:21:44 -0700 | [diff] [blame] | 1308 | max_zone_pfn = zone_end_pfn(zone); |
Rafael J. Wysocki | ae83c5ee | 2006-09-25 23:32:45 -0700 | [diff] [blame] | 1309 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1310 | if (saveable_page(zone, pfn)) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1311 | n++; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1312 | } |
Rafael J. Wysocki | a0f4965 | 2005-10-30 14:59:57 -0800 | [diff] [blame] | 1313 | return n; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1314 | } |
| 1315 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1316 | /* |
| 1317 | * This is needed, because copy_page and memcpy are not usable for copying |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1318 | * task structs. |
| 1319 | */ |
| 1320 | static inline void do_copy_page(long *dst, long *src) |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1321 | { |
| 1322 | int n; |
| 1323 | |
Rafael J. Wysocki | f623f0d | 2006-09-25 23:32:49 -0700 | [diff] [blame] | 1324 | for (n = PAGE_SIZE / sizeof(long); n; n--) |
| 1325 | *dst++ = *src++; |
| 1326 | } |
| 1327 | |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1328 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1329 | * safe_copy_page - Copy a page in a safe way. |
| 1330 | * |
| 1331 | * Check if the page we are going to copy is marked as present in the kernel |
| 1332 | * page tables (this always is the case if CONFIG_DEBUG_PAGEALLOC is not set |
| 1333 | * and in that case kernel_page_present() always returns 'true'). |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1334 | */ |
| 1335 | static void safe_copy_page(void *dst, struct page *s_page) |
| 1336 | { |
| 1337 | if (kernel_page_present(s_page)) { |
| 1338 | do_copy_page(dst, page_address(s_page)); |
| 1339 | } else { |
| 1340 | kernel_map_pages(s_page, 1, 1); |
| 1341 | do_copy_page(dst, page_address(s_page)); |
| 1342 | kernel_map_pages(s_page, 1, 0); |
| 1343 | } |
| 1344 | } |
| 1345 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1346 | #ifdef CONFIG_HIGHMEM |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 1347 | static inline struct page *page_is_saveable(struct zone *zone, unsigned long pfn) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1348 | { |
| 1349 | return is_highmem(zone) ? |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1350 | saveable_highmem_page(zone, pfn) : saveable_page(zone, pfn); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1351 | } |
| 1352 | |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1353 | static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1354 | { |
| 1355 | struct page *s_page, *d_page; |
| 1356 | void *src, *dst; |
| 1357 | |
| 1358 | s_page = pfn_to_page(src_pfn); |
| 1359 | d_page = pfn_to_page(dst_pfn); |
| 1360 | if (PageHighMem(s_page)) { |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 1361 | src = kmap_atomic(s_page); |
| 1362 | dst = kmap_atomic(d_page); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1363 | do_copy_page(dst, src); |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 1364 | kunmap_atomic(dst); |
| 1365 | kunmap_atomic(src); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1366 | } else { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1367 | if (PageHighMem(d_page)) { |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1368 | /* |
| 1369 | * The page pointed to by src may contain some kernel |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1370 | * data modified by kmap_atomic() |
| 1371 | */ |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1372 | safe_copy_page(buffer, s_page); |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 1373 | dst = kmap_atomic(d_page); |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 1374 | copy_page(dst, buffer); |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 1375 | kunmap_atomic(dst); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1376 | } else { |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1377 | safe_copy_page(page_address(d_page), s_page); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1378 | } |
| 1379 | } |
| 1380 | } |
| 1381 | #else |
Rafael J. Wysocki | 846705d | 2008-11-26 18:00:24 -0500 | [diff] [blame] | 1382 | #define page_is_saveable(zone, pfn) saveable_page(zone, pfn) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1383 | |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1384 | static inline void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1385 | { |
Rafael J. Wysocki | 8a235ef | 2008-02-20 01:47:44 +0100 | [diff] [blame] | 1386 | safe_copy_page(page_address(pfn_to_page(dst_pfn)), |
| 1387 | pfn_to_page(src_pfn)); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1388 | } |
| 1389 | #endif /* CONFIG_HIGHMEM */ |
| 1390 | |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 1391 | static void copy_data_pages(struct memory_bitmap *copy_bm, |
| 1392 | struct memory_bitmap *orig_bm) |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1393 | { |
| 1394 | struct zone *zone; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1395 | unsigned long pfn; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1396 | |
Gerald Schaefer | 98e73dc | 2009-07-22 00:36:56 +0200 | [diff] [blame] | 1397 | for_each_populated_zone(zone) { |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1398 | unsigned long max_zone_pfn; |
| 1399 | |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1400 | mark_free_pages(zone); |
Xishi Qiu | c33bc31 | 2013-09-11 14:21:44 -0700 | [diff] [blame] | 1401 | max_zone_pfn = zone_end_pfn(zone); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1402 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1403 | if (page_is_saveable(zone, pfn)) |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1404 | memory_bm_set_bit(orig_bm, pfn); |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1405 | } |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1406 | memory_bm_position_reset(orig_bm); |
| 1407 | memory_bm_position_reset(copy_bm); |
Fengguang Wu | df7c487 | 2007-10-20 02:26:04 +0200 | [diff] [blame] | 1408 | for(;;) { |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1409 | pfn = memory_bm_next_pfn(orig_bm); |
Fengguang Wu | df7c487 | 2007-10-20 02:26:04 +0200 | [diff] [blame] | 1410 | if (unlikely(pfn == BM_END_OF_MAP)) |
| 1411 | break; |
| 1412 | copy_data_page(memory_bm_next_pfn(copy_bm), pfn); |
| 1413 | } |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1414 | } |
| 1415 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1416 | /* Total number of image pages */ |
| 1417 | static unsigned int nr_copy_pages; |
| 1418 | /* Number of pages needed for saving the original pfns of the image pages */ |
| 1419 | static unsigned int nr_meta_pages; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1420 | /* |
| 1421 | * Numbers of normal and highmem page frames allocated for hibernation image |
| 1422 | * before suspending devices. |
| 1423 | */ |
| 1424 | unsigned int alloc_normal, alloc_highmem; |
| 1425 | /* |
| 1426 | * Memory bitmap used for marking saveable pages (during hibernation) or |
| 1427 | * hibernation image pages (during restore) |
| 1428 | */ |
| 1429 | static struct memory_bitmap orig_bm; |
| 1430 | /* |
| 1431 | * Memory bitmap used during hibernation for marking allocated page frames that |
| 1432 | * will contain copies of saveable pages. During restore it is initially used |
| 1433 | * for marking hibernation image pages, but then the set bits from it are |
| 1434 | * duplicated in @orig_bm and it is released. On highmem systems it is next |
| 1435 | * used for marking "safe" highmem pages, but it has to be reinitialized for |
| 1436 | * this purpose. |
| 1437 | */ |
| 1438 | static struct memory_bitmap copy_bm; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1439 | |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1440 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1441 | * swsusp_free - Free pages allocated for hibernation image. |
Rafael J. Wysocki | cd560bb | 2006-09-25 23:32:50 -0700 | [diff] [blame] | 1442 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1443 | * Image pages are alocated before snapshot creation, so they need to be |
| 1444 | * released after resume. |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1445 | */ |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1446 | void swsusp_free(void) |
| 1447 | { |
Joerg Roedel | fdd64ed | 2014-09-30 13:31:29 +0200 | [diff] [blame] | 1448 | unsigned long fb_pfn, fr_pfn; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1449 | |
Joerg Roedel | fdd64ed | 2014-09-30 13:31:29 +0200 | [diff] [blame] | 1450 | if (!forbidden_pages_map || !free_pages_map) |
| 1451 | goto out; |
Rafael J. Wysocki | ae83c5ee | 2006-09-25 23:32:45 -0700 | [diff] [blame] | 1452 | |
Joerg Roedel | fdd64ed | 2014-09-30 13:31:29 +0200 | [diff] [blame] | 1453 | memory_bm_position_reset(forbidden_pages_map); |
| 1454 | memory_bm_position_reset(free_pages_map); |
| 1455 | |
| 1456 | loop: |
| 1457 | fr_pfn = memory_bm_next_pfn(free_pages_map); |
| 1458 | fb_pfn = memory_bm_next_pfn(forbidden_pages_map); |
| 1459 | |
| 1460 | /* |
| 1461 | * Find the next bit set in both bitmaps. This is guaranteed to |
| 1462 | * terminate when fb_pfn == fr_pfn == BM_END_OF_MAP. |
| 1463 | */ |
| 1464 | do { |
| 1465 | if (fb_pfn < fr_pfn) |
| 1466 | fb_pfn = memory_bm_next_pfn(forbidden_pages_map); |
| 1467 | if (fr_pfn < fb_pfn) |
| 1468 | fr_pfn = memory_bm_next_pfn(free_pages_map); |
| 1469 | } while (fb_pfn != fr_pfn); |
| 1470 | |
| 1471 | if (fr_pfn != BM_END_OF_MAP && pfn_valid(fr_pfn)) { |
| 1472 | struct page *page = pfn_to_page(fr_pfn); |
| 1473 | |
| 1474 | memory_bm_clear_current(forbidden_pages_map); |
| 1475 | memory_bm_clear_current(free_pages_map); |
Rafael J. Wysocki | 4c0b6c1 | 2016-07-10 02:12:10 +0200 | [diff] [blame] | 1476 | hibernate_restore_unprotect_page(page_address(page)); |
Joerg Roedel | fdd64ed | 2014-09-30 13:31:29 +0200 | [diff] [blame] | 1477 | __free_page(page); |
| 1478 | goto loop; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1479 | } |
Joerg Roedel | fdd64ed | 2014-09-30 13:31:29 +0200 | [diff] [blame] | 1480 | |
| 1481 | out: |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 1482 | nr_copy_pages = 0; |
| 1483 | nr_meta_pages = 0; |
Rafael J. Wysocki | 75534b5 | 2006-09-25 23:32:52 -0700 | [diff] [blame] | 1484 | restore_pblist = NULL; |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 1485 | buffer = NULL; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1486 | alloc_normal = 0; |
| 1487 | alloc_highmem = 0; |
Rafael J. Wysocki | 4c0b6c1 | 2016-07-10 02:12:10 +0200 | [diff] [blame] | 1488 | hibernate_restore_protection_end(); |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1489 | } |
| 1490 | |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1491 | /* Helper functions used for the shrinking of memory. */ |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1492 | |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1493 | #define GFP_IMAGE (GFP_KERNEL | __GFP_NOWARN) |
| 1494 | |
| 1495 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1496 | * preallocate_image_pages - Allocate a number of pages for hibernation image. |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1497 | * @nr_pages: Number of page frames to allocate. |
| 1498 | * @mask: GFP flags to use for the allocation. |
| 1499 | * |
| 1500 | * Return value: Number of page frames actually allocated |
| 1501 | */ |
| 1502 | static unsigned long preallocate_image_pages(unsigned long nr_pages, gfp_t mask) |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1503 | { |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1504 | unsigned long nr_alloc = 0; |
| 1505 | |
| 1506 | while (nr_pages > 0) { |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1507 | struct page *page; |
| 1508 | |
| 1509 | page = alloc_image_page(mask); |
| 1510 | if (!page) |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1511 | break; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1512 | memory_bm_set_bit(©_bm, page_to_pfn(page)); |
| 1513 | if (PageHighMem(page)) |
| 1514 | alloc_highmem++; |
| 1515 | else |
| 1516 | alloc_normal++; |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1517 | nr_pages--; |
| 1518 | nr_alloc++; |
| 1519 | } |
| 1520 | |
| 1521 | return nr_alloc; |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1522 | } |
| 1523 | |
Rafael J. Wysocki | 6715045 | 2010-09-11 20:58:27 +0200 | [diff] [blame] | 1524 | static unsigned long preallocate_image_memory(unsigned long nr_pages, |
| 1525 | unsigned long avail_normal) |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1526 | { |
Rafael J. Wysocki | 6715045 | 2010-09-11 20:58:27 +0200 | [diff] [blame] | 1527 | unsigned long alloc; |
| 1528 | |
| 1529 | if (avail_normal <= alloc_normal) |
| 1530 | return 0; |
| 1531 | |
| 1532 | alloc = avail_normal - alloc_normal; |
| 1533 | if (nr_pages < alloc) |
| 1534 | alloc = nr_pages; |
| 1535 | |
| 1536 | return preallocate_image_pages(alloc, GFP_IMAGE); |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1537 | } |
| 1538 | |
| 1539 | #ifdef CONFIG_HIGHMEM |
| 1540 | static unsigned long preallocate_image_highmem(unsigned long nr_pages) |
| 1541 | { |
| 1542 | return preallocate_image_pages(nr_pages, GFP_IMAGE | __GFP_HIGHMEM); |
| 1543 | } |
| 1544 | |
| 1545 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1546 | * __fraction - Compute (an approximation of) x * (multiplier / base). |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1547 | */ |
| 1548 | static unsigned long __fraction(u64 x, u64 multiplier, u64 base) |
| 1549 | { |
| 1550 | x *= multiplier; |
| 1551 | do_div(x, base); |
| 1552 | return (unsigned long)x; |
| 1553 | } |
| 1554 | |
| 1555 | static unsigned long preallocate_highmem_fraction(unsigned long nr_pages, |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 1556 | unsigned long highmem, |
| 1557 | unsigned long total) |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1558 | { |
| 1559 | unsigned long alloc = __fraction(nr_pages, highmem, total); |
| 1560 | |
| 1561 | return preallocate_image_pages(alloc, GFP_IMAGE | __GFP_HIGHMEM); |
| 1562 | } |
| 1563 | #else /* CONFIG_HIGHMEM */ |
| 1564 | static inline unsigned long preallocate_image_highmem(unsigned long nr_pages) |
| 1565 | { |
| 1566 | return 0; |
| 1567 | } |
| 1568 | |
| 1569 | static inline unsigned long preallocate_highmem_fraction(unsigned long nr_pages, |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 1570 | unsigned long highmem, |
| 1571 | unsigned long total) |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1572 | { |
| 1573 | return 0; |
| 1574 | } |
| 1575 | #endif /* CONFIG_HIGHMEM */ |
| 1576 | |
| 1577 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1578 | * free_unnecessary_pages - Release preallocated pages not needed for the image. |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1579 | */ |
Wonhong Kwon | a64fc82 | 2015-02-03 17:22:00 +0900 | [diff] [blame] | 1580 | static unsigned long free_unnecessary_pages(void) |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1581 | { |
Wonhong Kwon | a64fc82 | 2015-02-03 17:22:00 +0900 | [diff] [blame] | 1582 | unsigned long save, to_free_normal, to_free_highmem, free; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1583 | |
Rafael J. Wysocki | 6715045 | 2010-09-11 20:58:27 +0200 | [diff] [blame] | 1584 | save = count_data_pages(); |
| 1585 | if (alloc_normal >= save) { |
| 1586 | to_free_normal = alloc_normal - save; |
| 1587 | save = 0; |
| 1588 | } else { |
| 1589 | to_free_normal = 0; |
| 1590 | save -= alloc_normal; |
| 1591 | } |
| 1592 | save += count_highmem_pages(); |
| 1593 | if (alloc_highmem >= save) { |
| 1594 | to_free_highmem = alloc_highmem - save; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1595 | } else { |
| 1596 | to_free_highmem = 0; |
Rafael J. Wysocki | 4d4cf23 | 2011-07-06 20:15:23 +0200 | [diff] [blame] | 1597 | save -= alloc_highmem; |
| 1598 | if (to_free_normal > save) |
| 1599 | to_free_normal -= save; |
| 1600 | else |
| 1601 | to_free_normal = 0; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1602 | } |
Wonhong Kwon | a64fc82 | 2015-02-03 17:22:00 +0900 | [diff] [blame] | 1603 | free = to_free_normal + to_free_highmem; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1604 | |
| 1605 | memory_bm_position_reset(©_bm); |
| 1606 | |
Rafael J. Wysocki | a9c9b44 | 2010-02-25 22:32:37 +0100 | [diff] [blame] | 1607 | while (to_free_normal > 0 || to_free_highmem > 0) { |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1608 | unsigned long pfn = memory_bm_next_pfn(©_bm); |
| 1609 | struct page *page = pfn_to_page(pfn); |
| 1610 | |
| 1611 | if (PageHighMem(page)) { |
| 1612 | if (!to_free_highmem) |
| 1613 | continue; |
| 1614 | to_free_highmem--; |
| 1615 | alloc_highmem--; |
| 1616 | } else { |
| 1617 | if (!to_free_normal) |
| 1618 | continue; |
| 1619 | to_free_normal--; |
| 1620 | alloc_normal--; |
| 1621 | } |
| 1622 | memory_bm_clear_bit(©_bm, pfn); |
| 1623 | swsusp_unset_page_forbidden(page); |
| 1624 | swsusp_unset_page_free(page); |
| 1625 | __free_page(page); |
| 1626 | } |
Wonhong Kwon | a64fc82 | 2015-02-03 17:22:00 +0900 | [diff] [blame] | 1627 | |
| 1628 | return free; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1629 | } |
| 1630 | |
| 1631 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1632 | * minimum_image_size - Estimate the minimum acceptable size of an image. |
Rafael J. Wysocki | ef4aede | 2009-07-08 13:24:12 +0200 | [diff] [blame] | 1633 | * @saveable: Number of saveable pages in the system. |
| 1634 | * |
| 1635 | * We want to avoid attempting to free too much memory too hard, so estimate the |
| 1636 | * minimum acceptable size of a hibernation image to use as the lower limit for |
| 1637 | * preallocating memory. |
| 1638 | * |
| 1639 | * We assume that the minimum image size should be proportional to |
| 1640 | * |
| 1641 | * [number of saveable pages] - [number of pages that can be freed in theory] |
| 1642 | * |
| 1643 | * where the second term is the sum of (1) reclaimable slab pages, (2) active |
Geert Uytterhoeven | 4d43482 | 2014-03-11 11:23:41 +0100 | [diff] [blame] | 1644 | * and (3) inactive anonymous pages, (4) active and (5) inactive file pages, |
Rafael J. Wysocki | ef4aede | 2009-07-08 13:24:12 +0200 | [diff] [blame] | 1645 | * minus mapped file pages. |
| 1646 | */ |
| 1647 | static unsigned long minimum_image_size(unsigned long saveable) |
| 1648 | { |
| 1649 | unsigned long size; |
| 1650 | |
| 1651 | size = global_page_state(NR_SLAB_RECLAIMABLE) |
Mel Gorman | 599d0c9 | 2016-07-28 15:45:31 -0700 | [diff] [blame] | 1652 | + global_node_page_state(NR_ACTIVE_ANON) |
| 1653 | + global_node_page_state(NR_INACTIVE_ANON) |
| 1654 | + global_node_page_state(NR_ACTIVE_FILE) |
| 1655 | + global_node_page_state(NR_INACTIVE_FILE) |
| 1656 | - global_node_page_state(NR_FILE_MAPPED); |
Rafael J. Wysocki | ef4aede | 2009-07-08 13:24:12 +0200 | [diff] [blame] | 1657 | |
| 1658 | return saveable <= size ? 0 : saveable - size; |
| 1659 | } |
| 1660 | |
| 1661 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1662 | * hibernate_preallocate_memory - Preallocate memory for hibernation image. |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1663 | * |
| 1664 | * To create a hibernation image it is necessary to make a copy of every page |
| 1665 | * frame in use. We also need a number of page frames to be free during |
| 1666 | * hibernation for allocations made while saving the image and for device |
| 1667 | * drivers, in case they need to allocate memory from their hibernation |
Rafael J. Wysocki | ddeb648 | 2011-05-15 11:38:48 +0200 | [diff] [blame] | 1668 | * callbacks (these two numbers are given by PAGES_FOR_IO (which is a rough |
| 1669 | * estimate) and reserverd_size divided by PAGE_SIZE (which is tunable through |
| 1670 | * /sys/power/reserved_size, respectively). To make this happen, we compute the |
| 1671 | * total number of available page frames and allocate at least |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1672 | * |
Rafael J. Wysocki | ddeb648 | 2011-05-15 11:38:48 +0200 | [diff] [blame] | 1673 | * ([page frames total] + PAGES_FOR_IO + [metadata pages]) / 2 |
| 1674 | * + 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE) |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1675 | * |
| 1676 | * of them, which corresponds to the maximum size of a hibernation image. |
| 1677 | * |
| 1678 | * If image_size is set below the number following from the above formula, |
| 1679 | * the preallocation of memory is continued until the total number of saveable |
Rafael J. Wysocki | ef4aede | 2009-07-08 13:24:12 +0200 | [diff] [blame] | 1680 | * pages in the system is below the requested image size or the minimum |
| 1681 | * acceptable image size returned by minimum_image_size(), whichever is greater. |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1682 | */ |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1683 | int hibernate_preallocate_memory(void) |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1684 | { |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1685 | struct zone *zone; |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1686 | unsigned long saveable, size, max_size, count, highmem, pages = 0; |
Rafael J. Wysocki | 6715045 | 2010-09-11 20:58:27 +0200 | [diff] [blame] | 1687 | unsigned long alloc, save_highmem, pages_highmem, avail_normal; |
Tina Ruchandani | db59760 | 2014-10-30 11:04:53 -0700 | [diff] [blame] | 1688 | ktime_t start, stop; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1689 | int error; |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1690 | |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1691 | printk(KERN_INFO "PM: Preallocating image memory... "); |
Tina Ruchandani | db59760 | 2014-10-30 11:04:53 -0700 | [diff] [blame] | 1692 | start = ktime_get(); |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1693 | |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1694 | error = memory_bm_create(&orig_bm, GFP_IMAGE, PG_ANY); |
| 1695 | if (error) |
| 1696 | goto err_out; |
| 1697 | |
| 1698 | error = memory_bm_create(©_bm, GFP_IMAGE, PG_ANY); |
| 1699 | if (error) |
| 1700 | goto err_out; |
| 1701 | |
| 1702 | alloc_normal = 0; |
| 1703 | alloc_highmem = 0; |
| 1704 | |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1705 | /* Count the number of saveable data pages. */ |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1706 | save_highmem = count_highmem_pages(); |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1707 | saveable = count_data_pages(); |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1708 | |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1709 | /* |
| 1710 | * Compute the total number of page frames we can use (count) and the |
| 1711 | * number of pages needed for image metadata (size). |
| 1712 | */ |
| 1713 | count = saveable; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1714 | saveable += save_highmem; |
| 1715 | highmem = save_highmem; |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1716 | size = 0; |
| 1717 | for_each_populated_zone(zone) { |
| 1718 | size += snapshot_additional_pages(zone); |
| 1719 | if (is_highmem(zone)) |
| 1720 | highmem += zone_page_state(zone, NR_FREE_PAGES); |
| 1721 | else |
| 1722 | count += zone_page_state(zone, NR_FREE_PAGES); |
| 1723 | } |
Rafael J. Wysocki | 6715045 | 2010-09-11 20:58:27 +0200 | [diff] [blame] | 1724 | avail_normal = count; |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1725 | count += highmem; |
| 1726 | count -= totalreserve_pages; |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1727 | |
Martin Schwidefsky | 85055dd | 2011-08-17 20:42:24 +0200 | [diff] [blame] | 1728 | /* Add number of pages required for page keys (s390 only). */ |
| 1729 | size += page_key_additional_pages(saveable); |
| 1730 | |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1731 | /* Compute the maximum number of saveable pages to leave in memory. */ |
Rafael J. Wysocki | ddeb648 | 2011-05-15 11:38:48 +0200 | [diff] [blame] | 1732 | max_size = (count - (size + PAGES_FOR_IO)) / 2 |
| 1733 | - 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE); |
Rafael J. Wysocki | 266f1a2 | 2010-09-20 19:44:38 +0200 | [diff] [blame] | 1734 | /* Compute the desired number of image pages specified by image_size. */ |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1735 | size = DIV_ROUND_UP(image_size, PAGE_SIZE); |
| 1736 | if (size > max_size) |
| 1737 | size = max_size; |
| 1738 | /* |
Rafael J. Wysocki | 266f1a2 | 2010-09-20 19:44:38 +0200 | [diff] [blame] | 1739 | * If the desired number of image pages is at least as large as the |
| 1740 | * current number of saveable pages in memory, allocate page frames for |
| 1741 | * the image and we're done. |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1742 | */ |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1743 | if (size >= saveable) { |
| 1744 | pages = preallocate_image_highmem(save_highmem); |
Rafael J. Wysocki | 6715045 | 2010-09-11 20:58:27 +0200 | [diff] [blame] | 1745 | pages += preallocate_image_memory(saveable - pages, avail_normal); |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1746 | goto out; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1747 | } |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1748 | |
Rafael J. Wysocki | ef4aede | 2009-07-08 13:24:12 +0200 | [diff] [blame] | 1749 | /* Estimate the minimum size of the image. */ |
| 1750 | pages = minimum_image_size(saveable); |
Rafael J. Wysocki | 6715045 | 2010-09-11 20:58:27 +0200 | [diff] [blame] | 1751 | /* |
| 1752 | * To avoid excessive pressure on the normal zone, leave room in it to |
| 1753 | * accommodate an image of the minimum size (unless it's already too |
| 1754 | * small, in which case don't preallocate pages from it at all). |
| 1755 | */ |
| 1756 | if (avail_normal > pages) |
| 1757 | avail_normal -= pages; |
| 1758 | else |
| 1759 | avail_normal = 0; |
Rafael J. Wysocki | ef4aede | 2009-07-08 13:24:12 +0200 | [diff] [blame] | 1760 | if (size < pages) |
| 1761 | size = min_t(unsigned long, pages, max_size); |
| 1762 | |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1763 | /* |
| 1764 | * Let the memory management subsystem know that we're going to need a |
| 1765 | * large number of page frames to allocate and make it free some memory. |
| 1766 | * NOTE: If this is not done, performance will be hurt badly in some |
| 1767 | * test cases. |
| 1768 | */ |
| 1769 | shrink_all_memory(saveable - size); |
| 1770 | |
| 1771 | /* |
| 1772 | * The number of saveable pages in memory was too high, so apply some |
| 1773 | * pressure to decrease it. First, make room for the largest possible |
| 1774 | * image and fail if that doesn't work. Next, try to decrease the size |
Rafael J. Wysocki | ef4aede | 2009-07-08 13:24:12 +0200 | [diff] [blame] | 1775 | * of the image as much as indicated by 'size' using allocations from |
| 1776 | * highmem and non-highmem zones separately. |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1777 | */ |
| 1778 | pages_highmem = preallocate_image_highmem(highmem / 2); |
Aaron Lu | fd432b9 | 2013-11-06 08:41:31 +0800 | [diff] [blame] | 1779 | alloc = count - max_size; |
| 1780 | if (alloc > pages_highmem) |
| 1781 | alloc -= pages_highmem; |
| 1782 | else |
| 1783 | alloc = 0; |
Rafael J. Wysocki | 6715045 | 2010-09-11 20:58:27 +0200 | [diff] [blame] | 1784 | pages = preallocate_image_memory(alloc, avail_normal); |
| 1785 | if (pages < alloc) { |
| 1786 | /* We have exhausted non-highmem pages, try highmem. */ |
| 1787 | alloc -= pages; |
| 1788 | pages += pages_highmem; |
| 1789 | pages_highmem = preallocate_image_highmem(alloc); |
| 1790 | if (pages_highmem < alloc) |
| 1791 | goto err_out; |
| 1792 | pages += pages_highmem; |
| 1793 | /* |
| 1794 | * size is the desired number of saveable pages to leave in |
| 1795 | * memory, so try to preallocate (all memory - size) pages. |
| 1796 | */ |
| 1797 | alloc = (count - pages) - size; |
| 1798 | pages += preallocate_image_highmem(alloc); |
| 1799 | } else { |
| 1800 | /* |
| 1801 | * There are approximately max_size saveable pages at this point |
| 1802 | * and we want to reduce this number down to size. |
| 1803 | */ |
| 1804 | alloc = max_size - size; |
| 1805 | size = preallocate_highmem_fraction(alloc, highmem, count); |
| 1806 | pages_highmem += size; |
| 1807 | alloc -= size; |
| 1808 | size = preallocate_image_memory(alloc, avail_normal); |
| 1809 | pages_highmem += preallocate_image_highmem(alloc - size); |
| 1810 | pages += pages_highmem + size; |
| 1811 | } |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1812 | |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1813 | /* |
| 1814 | * We only need as many page frames for the image as there are saveable |
| 1815 | * pages in memory, but we have allocated more. Release the excessive |
| 1816 | * ones now. |
| 1817 | */ |
Wonhong Kwon | a64fc82 | 2015-02-03 17:22:00 +0900 | [diff] [blame] | 1818 | pages -= free_unnecessary_pages(); |
Rafael J. Wysocki | 4bb3343 | 2009-07-08 13:23:51 +0200 | [diff] [blame] | 1819 | |
| 1820 | out: |
Tina Ruchandani | db59760 | 2014-10-30 11:04:53 -0700 | [diff] [blame] | 1821 | stop = ktime_get(); |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1822 | printk(KERN_CONT "done (allocated %lu pages)\n", pages); |
Tina Ruchandani | db59760 | 2014-10-30 11:04:53 -0700 | [diff] [blame] | 1823 | swsusp_show_speed(start, stop, pages, "Allocated"); |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1824 | |
| 1825 | return 0; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1826 | |
| 1827 | err_out: |
| 1828 | printk(KERN_CONT "\n"); |
| 1829 | swsusp_free(); |
| 1830 | return -ENOMEM; |
Rafael J. Wysocki | fe41953 | 2009-06-11 23:11:17 +0200 | [diff] [blame] | 1831 | } |
| 1832 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1833 | #ifdef CONFIG_HIGHMEM |
| 1834 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1835 | * count_pages_for_highmem - Count non-highmem pages needed for copying highmem. |
| 1836 | * |
| 1837 | * Compute the number of non-highmem pages that will be necessary for creating |
| 1838 | * copies of highmem pages. |
| 1839 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1840 | static unsigned int count_pages_for_highmem(unsigned int nr_highmem) |
| 1841 | { |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1842 | unsigned int free_highmem = count_free_highmem_pages() + alloc_highmem; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1843 | |
| 1844 | if (free_highmem >= nr_highmem) |
| 1845 | nr_highmem = 0; |
| 1846 | else |
| 1847 | nr_highmem -= free_highmem; |
| 1848 | |
| 1849 | return nr_highmem; |
| 1850 | } |
| 1851 | #else |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 1852 | static unsigned int count_pages_for_highmem(unsigned int nr_highmem) { return 0; } |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1853 | #endif /* CONFIG_HIGHMEM */ |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1854 | |
| 1855 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1856 | * enough_free_mem - Check if there is enough free memory for the image. |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1857 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1858 | static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem) |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1859 | { |
Rafael J. Wysocki | e5e2fa7 | 2006-01-06 00:14:20 -0800 | [diff] [blame] | 1860 | struct zone *zone; |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1861 | unsigned int free = alloc_normal; |
Rafael J. Wysocki | e5e2fa7 | 2006-01-06 00:14:20 -0800 | [diff] [blame] | 1862 | |
Gerald Schaefer | 98e73dc | 2009-07-22 00:36:56 +0200 | [diff] [blame] | 1863 | for_each_populated_zone(zone) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1864 | if (!is_highmem(zone)) |
Christoph Lameter | d23ad42 | 2007-02-10 01:43:02 -0800 | [diff] [blame] | 1865 | free += zone_page_state(zone, NR_FREE_PAGES); |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 1866 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1867 | nr_pages += count_pages_for_highmem(nr_highmem); |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1868 | pr_debug("PM: Normal pages needed: %u + %u, available pages: %u\n", |
| 1869 | nr_pages, PAGES_FOR_IO, free); |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 1870 | |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1871 | return free > nr_pages + PAGES_FOR_IO; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1872 | } |
| 1873 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1874 | #ifdef CONFIG_HIGHMEM |
| 1875 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1876 | * get_highmem_buffer - Allocate a buffer for highmem pages. |
| 1877 | * |
| 1878 | * If there are some highmem pages in the hibernation image, we may need a |
| 1879 | * buffer to copy them and/or load their data. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1880 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1881 | static inline int get_highmem_buffer(int safe_needed) |
| 1882 | { |
| 1883 | buffer = get_image_page(GFP_ATOMIC | __GFP_COLD, safe_needed); |
| 1884 | return buffer ? 0 : -ENOMEM; |
| 1885 | } |
| 1886 | |
| 1887 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1888 | * alloc_highmem_image_pages - Allocate some highmem pages for the image. |
| 1889 | * |
| 1890 | * Try to allocate as many pages as needed, but if the number of free highmem |
| 1891 | * pages is less than that, allocate them all. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1892 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 1893 | static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm, |
| 1894 | unsigned int nr_highmem) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1895 | { |
| 1896 | unsigned int to_alloc = count_free_highmem_pages(); |
| 1897 | |
| 1898 | if (to_alloc > nr_highmem) |
| 1899 | to_alloc = nr_highmem; |
| 1900 | |
| 1901 | nr_highmem -= to_alloc; |
| 1902 | while (to_alloc-- > 0) { |
| 1903 | struct page *page; |
| 1904 | |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1905 | page = alloc_image_page(__GFP_HIGHMEM|__GFP_KSWAPD_RECLAIM); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1906 | memory_bm_set_bit(bm, page_to_pfn(page)); |
| 1907 | } |
| 1908 | return nr_highmem; |
| 1909 | } |
| 1910 | #else |
| 1911 | static inline int get_highmem_buffer(int safe_needed) { return 0; } |
| 1912 | |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 1913 | static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm, |
| 1914 | unsigned int n) { return 0; } |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1915 | #endif /* CONFIG_HIGHMEM */ |
| 1916 | |
| 1917 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1918 | * swsusp_alloc - Allocate memory for hibernation image. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1919 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1920 | * We first try to allocate as many highmem pages as there are |
| 1921 | * saveable highmem pages in the system. If that fails, we allocate |
| 1922 | * non-highmem pages for the copies of the remaining highmem ones. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1923 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1924 | * In this approach it is likely that the copies of highmem pages will |
| 1925 | * also be located in the high memory, because of the way in which |
| 1926 | * copy_data_pages() works. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1927 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 1928 | static int swsusp_alloc(struct memory_bitmap *orig_bm, |
| 1929 | struct memory_bitmap *copy_bm, |
| 1930 | unsigned int nr_pages, unsigned int nr_highmem) |
Rafael J. Wysocki | 054bd4c | 2005-11-08 21:34:39 -0800 | [diff] [blame] | 1931 | { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1932 | if (nr_highmem > 0) { |
Stanislaw Gruszka | 2e725a0 | 2011-02-12 21:06:51 +0100 | [diff] [blame] | 1933 | if (get_highmem_buffer(PG_ANY)) |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1934 | goto err_out; |
| 1935 | if (nr_highmem > alloc_highmem) { |
| 1936 | nr_highmem -= alloc_highmem; |
| 1937 | nr_pages += alloc_highmem_pages(copy_bm, nr_highmem); |
| 1938 | } |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1939 | } |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1940 | if (nr_pages > alloc_normal) { |
| 1941 | nr_pages -= alloc_normal; |
| 1942 | while (nr_pages-- > 0) { |
| 1943 | struct page *page; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1944 | |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1945 | page = alloc_image_page(GFP_ATOMIC | __GFP_COLD); |
| 1946 | if (!page) |
| 1947 | goto err_out; |
| 1948 | memory_bm_set_bit(copy_bm, page_to_pfn(page)); |
| 1949 | } |
Rafael J. Wysocki | 054bd4c | 2005-11-08 21:34:39 -0800 | [diff] [blame] | 1950 | } |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1951 | |
Rafael J. Wysocki | 054bd4c | 2005-11-08 21:34:39 -0800 | [diff] [blame] | 1952 | return 0; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1953 | |
Rafael J. Wysocki | 64a473c | 2009-07-08 13:24:05 +0200 | [diff] [blame] | 1954 | err_out: |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1955 | swsusp_free(); |
Stanislaw Gruszka | 2e725a0 | 2011-02-12 21:06:51 +0100 | [diff] [blame] | 1956 | return -ENOMEM; |
Rafael J. Wysocki | 054bd4c | 2005-11-08 21:34:39 -0800 | [diff] [blame] | 1957 | } |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1958 | |
Andi Kleen | 722a9f9 | 2014-05-02 00:44:38 +0200 | [diff] [blame] | 1959 | asmlinkage __visible int swsusp_save(void) |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1960 | { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1961 | unsigned int nr_pages, nr_highmem; |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1962 | |
Frans Pop | 07c3bb5 | 2010-02-11 23:09:08 +0100 | [diff] [blame] | 1963 | printk(KERN_INFO "PM: Creating hibernation image:\n"); |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1964 | |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1965 | drain_local_pages(NULL); |
Rafael J. Wysocki | a0f4965 | 2005-10-30 14:59:57 -0800 | [diff] [blame] | 1966 | nr_pages = count_data_pages(); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1967 | nr_highmem = count_highmem_pages(); |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1968 | printk(KERN_INFO "PM: Need to copy %u pages\n", nr_pages + nr_highmem); |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1969 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1970 | if (!enough_free_mem(nr_pages, nr_highmem)) { |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1971 | printk(KERN_ERR "PM: Not enough free memory\n"); |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1972 | return -ENOMEM; |
| 1973 | } |
| 1974 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1975 | if (swsusp_alloc(&orig_bm, ©_bm, nr_pages, nr_highmem)) { |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1976 | printk(KERN_ERR "PM: Memory allocation failed\n"); |
Rafael J. Wysocki | a0f4965 | 2005-10-30 14:59:57 -0800 | [diff] [blame] | 1977 | return -ENOMEM; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1978 | } |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1979 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 1980 | /* |
| 1981 | * During allocating of suspend pagedir, new cold pages may appear. |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1982 | * Kill them. |
| 1983 | */ |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1984 | drain_local_pages(NULL); |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 1985 | copy_data_pages(©_bm, &orig_bm); |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 1986 | |
| 1987 | /* |
| 1988 | * End of critical section. From now on, we can write to memory, |
| 1989 | * but we should not touch disk. This specially means we must _not_ |
| 1990 | * touch swap space! Except we must write out our image of course. |
| 1991 | */ |
| 1992 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1993 | nr_pages += nr_highmem; |
Rafael J. Wysocki | a0f4965 | 2005-10-30 14:59:57 -0800 | [diff] [blame] | 1994 | nr_copy_pages = nr_pages; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1995 | nr_meta_pages = DIV_ROUND_UP(nr_pages * sizeof(long), PAGE_SIZE); |
Rafael J. Wysocki | a0f4965 | 2005-10-30 14:59:57 -0800 | [diff] [blame] | 1996 | |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 1997 | printk(KERN_INFO "PM: Hibernation image created (%d pages copied)\n", |
| 1998 | nr_pages); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 1999 | |
Rafael J. Wysocki | 25761b6 | 2005-10-30 14:59:56 -0800 | [diff] [blame] | 2000 | return 0; |
| 2001 | } |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2002 | |
Rafael J. Wysocki | d307c4a | 2007-10-18 03:04:52 -0700 | [diff] [blame] | 2003 | #ifndef CONFIG_ARCH_HIBERNATION_HEADER |
| 2004 | static int init_header_complete(struct swsusp_info *info) |
| 2005 | { |
| 2006 | memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname)); |
| 2007 | info->version_code = LINUX_VERSION_CODE; |
| 2008 | return 0; |
| 2009 | } |
| 2010 | |
| 2011 | static char *check_image_kernel(struct swsusp_info *info) |
| 2012 | { |
| 2013 | if (info->version_code != LINUX_VERSION_CODE) |
| 2014 | return "kernel version"; |
| 2015 | if (strcmp(info->uts.sysname,init_utsname()->sysname)) |
| 2016 | return "system type"; |
| 2017 | if (strcmp(info->uts.release,init_utsname()->release)) |
| 2018 | return "kernel release"; |
| 2019 | if (strcmp(info->uts.version,init_utsname()->version)) |
| 2020 | return "version"; |
| 2021 | if (strcmp(info->uts.machine,init_utsname()->machine)) |
| 2022 | return "machine"; |
| 2023 | return NULL; |
| 2024 | } |
| 2025 | #endif /* CONFIG_ARCH_HIBERNATION_HEADER */ |
| 2026 | |
Rafael J. Wysocki | af508b3 | 2007-10-26 00:59:31 +0200 | [diff] [blame] | 2027 | unsigned long snapshot_get_image_size(void) |
| 2028 | { |
| 2029 | return nr_copy_pages + nr_meta_pages + 1; |
| 2030 | } |
| 2031 | |
Rafael J. Wysocki | d307c4a | 2007-10-18 03:04:52 -0700 | [diff] [blame] | 2032 | static int init_header(struct swsusp_info *info) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2033 | { |
| 2034 | memset(info, 0, sizeof(struct swsusp_info)); |
Jiang Liu | 0ed5fd1 | 2013-07-03 15:03:43 -0700 | [diff] [blame] | 2035 | info->num_physpages = get_num_physpages(); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2036 | info->image_pages = nr_copy_pages; |
Rafael J. Wysocki | af508b3 | 2007-10-26 00:59:31 +0200 | [diff] [blame] | 2037 | info->pages = snapshot_get_image_size(); |
Rafael J. Wysocki | 6e1819d | 2006-03-23 03:00:03 -0800 | [diff] [blame] | 2038 | info->size = info->pages; |
| 2039 | info->size <<= PAGE_SHIFT; |
Rafael J. Wysocki | d307c4a | 2007-10-18 03:04:52 -0700 | [diff] [blame] | 2040 | return init_header_complete(info); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2041 | } |
| 2042 | |
| 2043 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2044 | * pack_pfns - Prepare PFNs for saving. |
| 2045 | * @bm: Memory bitmap. |
| 2046 | * @buf: Memory buffer to store the PFNs in. |
| 2047 | * |
| 2048 | * PFNs corresponding to set bits in @bm are stored in the area of memory |
| 2049 | * pointed to by @buf (1 page at a time). |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2050 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2051 | static inline void pack_pfns(unsigned long *buf, struct memory_bitmap *bm) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2052 | { |
| 2053 | int j; |
| 2054 | |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 2055 | for (j = 0; j < PAGE_SIZE / sizeof(long); j++) { |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2056 | buf[j] = memory_bm_next_pfn(bm); |
| 2057 | if (unlikely(buf[j] == BM_END_OF_MAP)) |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 2058 | break; |
Martin Schwidefsky | 85055dd | 2011-08-17 20:42:24 +0200 | [diff] [blame] | 2059 | /* Save page key for data page (s390 only). */ |
| 2060 | page_key_read(buf + j); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2061 | } |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2062 | } |
| 2063 | |
| 2064 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2065 | * snapshot_read_next - Get the address to read the next image page from. |
| 2066 | * @handle: Snapshot handle to be used for the reading. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2067 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2068 | * On the first call, @handle should point to a zeroed snapshot_handle |
| 2069 | * structure. The structure gets populated then and a pointer to it should be |
| 2070 | * passed to this function every next time. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2071 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2072 | * On success, the function returns a positive number. Then, the caller |
| 2073 | * is allowed to read up to the returned number of bytes from the memory |
| 2074 | * location computed by the data_of() macro. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2075 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2076 | * The function returns 0 to indicate the end of the data stream condition, |
| 2077 | * and negative numbers are returned on errors. If that happens, the structure |
| 2078 | * pointed to by @handle is not updated and should not be used any more. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2079 | */ |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2080 | int snapshot_read_next(struct snapshot_handle *handle) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2081 | { |
Rafael J. Wysocki | fb13a28 | 2006-09-25 23:32:46 -0700 | [diff] [blame] | 2082 | if (handle->cur > nr_meta_pages + nr_copy_pages) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2083 | return 0; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 2084 | |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2085 | if (!buffer) { |
| 2086 | /* This makes the buffer be freed by swsusp_free() */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2087 | buffer = get_image_page(GFP_ATOMIC, PG_ANY); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2088 | if (!buffer) |
| 2089 | return -ENOMEM; |
| 2090 | } |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2091 | if (!handle->cur) { |
Rafael J. Wysocki | d307c4a | 2007-10-18 03:04:52 -0700 | [diff] [blame] | 2092 | int error; |
| 2093 | |
| 2094 | error = init_header((struct swsusp_info *)buffer); |
| 2095 | if (error) |
| 2096 | return error; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2097 | handle->buffer = buffer; |
Rafael J. Wysocki | b788db7 | 2006-09-25 23:32:54 -0700 | [diff] [blame] | 2098 | memory_bm_position_reset(&orig_bm); |
| 2099 | memory_bm_position_reset(©_bm); |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2100 | } else if (handle->cur <= nr_meta_pages) { |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 2101 | clear_page(buffer); |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2102 | pack_pfns(buffer, &orig_bm); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2103 | } else { |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2104 | struct page *page; |
| 2105 | |
| 2106 | page = pfn_to_page(memory_bm_next_pfn(©_bm)); |
| 2107 | if (PageHighMem(page)) { |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2108 | /* |
| 2109 | * Highmem pages are copied to the buffer, |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2110 | * because we can't return with a kmapped |
| 2111 | * highmem page (we may not be called again). |
| 2112 | */ |
| 2113 | void *kaddr; |
| 2114 | |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 2115 | kaddr = kmap_atomic(page); |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 2116 | copy_page(buffer, kaddr); |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 2117 | kunmap_atomic(kaddr); |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2118 | handle->buffer = buffer; |
| 2119 | } else { |
| 2120 | handle->buffer = page_address(page); |
| 2121 | } |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2122 | } |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2123 | handle->cur++; |
| 2124 | return PAGE_SIZE; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2125 | } |
| 2126 | |
Rafael J. Wysocki | 6dbecfd | 2016-06-29 03:02:16 +0200 | [diff] [blame] | 2127 | static void duplicate_memory_bitmap(struct memory_bitmap *dst, |
| 2128 | struct memory_bitmap *src) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2129 | { |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2130 | unsigned long pfn; |
| 2131 | |
| 2132 | memory_bm_position_reset(src); |
| 2133 | pfn = memory_bm_next_pfn(src); |
| 2134 | while (pfn != BM_END_OF_MAP) { |
| 2135 | memory_bm_set_bit(dst, pfn); |
| 2136 | pfn = memory_bm_next_pfn(src); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2137 | } |
| 2138 | } |
| 2139 | |
Rafael J. Wysocki | 6dbecfd | 2016-06-29 03:02:16 +0200 | [diff] [blame] | 2140 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2141 | * mark_unsafe_pages - Mark pages that were used before hibernation. |
| 2142 | * |
| 2143 | * Mark the pages that cannot be used for storing the image during restoration, |
| 2144 | * because they conflict with the pages that had been used before hibernation. |
Rafael J. Wysocki | 6dbecfd | 2016-06-29 03:02:16 +0200 | [diff] [blame] | 2145 | */ |
Rafael J. Wysocki | 6dbecfd | 2016-06-29 03:02:16 +0200 | [diff] [blame] | 2146 | static void mark_unsafe_pages(struct memory_bitmap *bm) |
| 2147 | { |
| 2148 | unsigned long pfn; |
| 2149 | |
| 2150 | /* Clear the "free"/"unsafe" bit for all PFNs */ |
| 2151 | memory_bm_position_reset(free_pages_map); |
| 2152 | pfn = memory_bm_next_pfn(free_pages_map); |
| 2153 | while (pfn != BM_END_OF_MAP) { |
| 2154 | memory_bm_clear_current(free_pages_map); |
| 2155 | pfn = memory_bm_next_pfn(free_pages_map); |
| 2156 | } |
| 2157 | |
| 2158 | /* Mark pages that correspond to the "original" PFNs as "unsafe" */ |
| 2159 | duplicate_memory_bitmap(free_pages_map, bm); |
| 2160 | |
| 2161 | allocated_unsafe_pages = 0; |
| 2162 | } |
| 2163 | |
Rafael J. Wysocki | d307c4a | 2007-10-18 03:04:52 -0700 | [diff] [blame] | 2164 | static int check_header(struct swsusp_info *info) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2165 | { |
Rafael J. Wysocki | d307c4a | 2007-10-18 03:04:52 -0700 | [diff] [blame] | 2166 | char *reason; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2167 | |
Rafael J. Wysocki | d307c4a | 2007-10-18 03:04:52 -0700 | [diff] [blame] | 2168 | reason = check_image_kernel(info); |
Jiang Liu | 0ed5fd1 | 2013-07-03 15:03:43 -0700 | [diff] [blame] | 2169 | if (!reason && info->num_physpages != get_num_physpages()) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2170 | reason = "memory size"; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2171 | if (reason) { |
Rafael J. Wysocki | 2397672 | 2007-12-08 02:09:43 +0100 | [diff] [blame] | 2172 | printk(KERN_ERR "PM: Image mismatch: %s\n", reason); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2173 | return -EPERM; |
| 2174 | } |
| 2175 | return 0; |
| 2176 | } |
| 2177 | |
| 2178 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2179 | * load header - Check the image header and copy the data from it. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2180 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2181 | static int load_header(struct swsusp_info *info) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2182 | { |
| 2183 | int error; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2184 | |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2185 | restore_pblist = NULL; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2186 | error = check_header(info); |
| 2187 | if (!error) { |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2188 | nr_copy_pages = info->image_pages; |
| 2189 | nr_meta_pages = info->pages - info->image_pages - 1; |
| 2190 | } |
| 2191 | return error; |
| 2192 | } |
| 2193 | |
| 2194 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2195 | * unpack_orig_pfns - Set bits corresponding to given PFNs in a memory bitmap. |
| 2196 | * @bm: Memory bitmap. |
| 2197 | * @buf: Area of memory containing the PFNs. |
| 2198 | * |
| 2199 | * For each element of the array pointed to by @buf (1 page at a time), set the |
| 2200 | * corresponding bit in @bm. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2201 | */ |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2202 | static int unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2203 | { |
| 2204 | int j; |
| 2205 | |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2206 | for (j = 0; j < PAGE_SIZE / sizeof(long); j++) { |
| 2207 | if (unlikely(buf[j] == BM_END_OF_MAP)) |
| 2208 | break; |
| 2209 | |
Martin Schwidefsky | 85055dd | 2011-08-17 20:42:24 +0200 | [diff] [blame] | 2210 | /* Extract and buffer page key for data page (s390 only). */ |
| 2211 | page_key_memorize(buf + j); |
| 2212 | |
Rafael J. Wysocki | 6dbecfd | 2016-06-29 03:02:16 +0200 | [diff] [blame] | 2213 | if (pfn_valid(buf[j]) && memory_bm_pfn_present(bm, buf[j])) |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2214 | memory_bm_set_bit(bm, buf[j]); |
| 2215 | else |
| 2216 | return -EFAULT; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2217 | } |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2218 | |
| 2219 | return 0; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2220 | } |
| 2221 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2222 | #ifdef CONFIG_HIGHMEM |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2223 | /* |
| 2224 | * struct highmem_pbe is used for creating the list of highmem pages that |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2225 | * should be restored atomically during the resume from disk, because the page |
| 2226 | * frames they have occupied before the suspend are in use. |
| 2227 | */ |
| 2228 | struct highmem_pbe { |
| 2229 | struct page *copy_page; /* data is here now */ |
| 2230 | struct page *orig_page; /* data was here before the suspend */ |
| 2231 | struct highmem_pbe *next; |
| 2232 | }; |
| 2233 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2234 | /* |
| 2235 | * List of highmem PBEs needed for restoring the highmem pages that were |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2236 | * allocated before the suspend and included in the suspend image, but have |
| 2237 | * also been allocated by the "resume" kernel, so their contents cannot be |
| 2238 | * written directly to their "original" page frames. |
| 2239 | */ |
| 2240 | static struct highmem_pbe *highmem_pblist; |
| 2241 | |
| 2242 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2243 | * count_highmem_image_pages - Compute the number of highmem pages in the image. |
| 2244 | * @bm: Memory bitmap. |
| 2245 | * |
| 2246 | * The bits in @bm that correspond to image pages are assumed to be set. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2247 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2248 | static unsigned int count_highmem_image_pages(struct memory_bitmap *bm) |
| 2249 | { |
| 2250 | unsigned long pfn; |
| 2251 | unsigned int cnt = 0; |
| 2252 | |
| 2253 | memory_bm_position_reset(bm); |
| 2254 | pfn = memory_bm_next_pfn(bm); |
| 2255 | while (pfn != BM_END_OF_MAP) { |
| 2256 | if (PageHighMem(pfn_to_page(pfn))) |
| 2257 | cnt++; |
| 2258 | |
| 2259 | pfn = memory_bm_next_pfn(bm); |
| 2260 | } |
| 2261 | return cnt; |
| 2262 | } |
| 2263 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2264 | static unsigned int safe_highmem_pages; |
| 2265 | |
| 2266 | static struct memory_bitmap *safe_highmem_bm; |
| 2267 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2268 | /** |
| 2269 | * prepare_highmem_image - Allocate memory for loading highmem data from image. |
| 2270 | * @bm: Pointer to an uninitialized memory bitmap structure. |
| 2271 | * @nr_highmem_p: Pointer to the number of highmem image pages. |
| 2272 | * |
| 2273 | * Try to allocate as many highmem pages as there are highmem image pages |
| 2274 | * (@nr_highmem_p points to the variable containing the number of highmem image |
| 2275 | * pages). The pages that are "safe" (ie. will not be overwritten when the |
| 2276 | * hibernation image is restored entirely) have the corresponding bits set in |
| 2277 | * @bm (it must be unitialized). |
| 2278 | * |
| 2279 | * NOTE: This function should not be called if there are no highmem image pages. |
| 2280 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2281 | static int prepare_highmem_image(struct memory_bitmap *bm, |
| 2282 | unsigned int *nr_highmem_p) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2283 | { |
| 2284 | unsigned int to_alloc; |
| 2285 | |
| 2286 | if (memory_bm_create(bm, GFP_ATOMIC, PG_SAFE)) |
| 2287 | return -ENOMEM; |
| 2288 | |
| 2289 | if (get_highmem_buffer(PG_SAFE)) |
| 2290 | return -ENOMEM; |
| 2291 | |
| 2292 | to_alloc = count_free_highmem_pages(); |
| 2293 | if (to_alloc > *nr_highmem_p) |
| 2294 | to_alloc = *nr_highmem_p; |
| 2295 | else |
| 2296 | *nr_highmem_p = to_alloc; |
| 2297 | |
| 2298 | safe_highmem_pages = 0; |
| 2299 | while (to_alloc-- > 0) { |
| 2300 | struct page *page; |
| 2301 | |
| 2302 | page = alloc_page(__GFP_HIGHMEM); |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 2303 | if (!swsusp_page_is_free(page)) { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2304 | /* The page is "safe", set its bit the bitmap */ |
| 2305 | memory_bm_set_bit(bm, page_to_pfn(page)); |
| 2306 | safe_highmem_pages++; |
| 2307 | } |
| 2308 | /* Mark the page as allocated */ |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 2309 | swsusp_set_page_forbidden(page); |
| 2310 | swsusp_set_page_free(page); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2311 | } |
| 2312 | memory_bm_position_reset(bm); |
| 2313 | safe_highmem_bm = bm; |
| 2314 | return 0; |
| 2315 | } |
| 2316 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2317 | static struct page *last_highmem_page; |
| 2318 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2319 | /** |
| 2320 | * get_highmem_page_buffer - Prepare a buffer to store a highmem image page. |
| 2321 | * |
| 2322 | * For a given highmem image page get a buffer that suspend_write_next() should |
| 2323 | * return to its caller to write to. |
| 2324 | * |
| 2325 | * If the page is to be saved to its "original" page frame or a copy of |
| 2326 | * the page is to be made in the highmem, @buffer is returned. Otherwise, |
| 2327 | * the copy of the page is to be made in normal memory, so the address of |
| 2328 | * the copy is returned. |
| 2329 | * |
| 2330 | * If @buffer is returned, the caller of suspend_write_next() will write |
| 2331 | * the page's contents to @buffer, so they will have to be copied to the |
| 2332 | * right location on the next call to suspend_write_next() and it is done |
| 2333 | * with the help of copy_last_highmem_page(). For this purpose, if |
| 2334 | * @buffer is returned, @last_highmem_page is set to the page to which |
| 2335 | * the data will have to be copied from @buffer. |
| 2336 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2337 | static void *get_highmem_page_buffer(struct page *page, |
| 2338 | struct chain_allocator *ca) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2339 | { |
| 2340 | struct highmem_pbe *pbe; |
| 2341 | void *kaddr; |
| 2342 | |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 2343 | if (swsusp_page_is_forbidden(page) && swsusp_page_is_free(page)) { |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2344 | /* |
| 2345 | * We have allocated the "original" page frame and we can |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2346 | * use it directly to store the loaded page. |
| 2347 | */ |
| 2348 | last_highmem_page = page; |
| 2349 | return buffer; |
| 2350 | } |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2351 | /* |
| 2352 | * The "original" page frame has not been allocated and we have to |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2353 | * use a "safe" page frame to store the loaded page. |
| 2354 | */ |
| 2355 | pbe = chain_alloc(ca, sizeof(struct highmem_pbe)); |
| 2356 | if (!pbe) { |
| 2357 | swsusp_free(); |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2358 | return ERR_PTR(-ENOMEM); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2359 | } |
| 2360 | pbe->orig_page = page; |
| 2361 | if (safe_highmem_pages > 0) { |
| 2362 | struct page *tmp; |
| 2363 | |
| 2364 | /* Copy of the page will be stored in high memory */ |
| 2365 | kaddr = buffer; |
| 2366 | tmp = pfn_to_page(memory_bm_next_pfn(safe_highmem_bm)); |
| 2367 | safe_highmem_pages--; |
| 2368 | last_highmem_page = tmp; |
| 2369 | pbe->copy_page = tmp; |
| 2370 | } else { |
| 2371 | /* Copy of the page will be stored in normal memory */ |
| 2372 | kaddr = safe_pages_list; |
| 2373 | safe_pages_list = safe_pages_list->next; |
| 2374 | pbe->copy_page = virt_to_page(kaddr); |
| 2375 | } |
| 2376 | pbe->next = highmem_pblist; |
| 2377 | highmem_pblist = pbe; |
| 2378 | return kaddr; |
| 2379 | } |
| 2380 | |
| 2381 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2382 | * copy_last_highmem_page - Copy most the most recent highmem image page. |
| 2383 | * |
| 2384 | * Copy the contents of a highmem image from @buffer, where the caller of |
| 2385 | * snapshot_write_next() has stored them, to the right location represented by |
| 2386 | * @last_highmem_page . |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2387 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2388 | static void copy_last_highmem_page(void) |
| 2389 | { |
| 2390 | if (last_highmem_page) { |
| 2391 | void *dst; |
| 2392 | |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 2393 | dst = kmap_atomic(last_highmem_page); |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 2394 | copy_page(dst, buffer); |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 2395 | kunmap_atomic(dst); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2396 | last_highmem_page = NULL; |
| 2397 | } |
| 2398 | } |
| 2399 | |
| 2400 | static inline int last_highmem_page_copied(void) |
| 2401 | { |
| 2402 | return !last_highmem_page; |
| 2403 | } |
| 2404 | |
| 2405 | static inline void free_highmem_data(void) |
| 2406 | { |
| 2407 | if (safe_highmem_bm) |
| 2408 | memory_bm_free(safe_highmem_bm, PG_UNSAFE_CLEAR); |
| 2409 | |
| 2410 | if (buffer) |
| 2411 | free_image_page(buffer, PG_UNSAFE_CLEAR); |
| 2412 | } |
| 2413 | #else |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2414 | static unsigned int count_highmem_image_pages(struct memory_bitmap *bm) { return 0; } |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2415 | |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2416 | static inline int prepare_highmem_image(struct memory_bitmap *bm, |
| 2417 | unsigned int *nr_highmem_p) { return 0; } |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2418 | |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2419 | static inline void *get_highmem_page_buffer(struct page *page, |
| 2420 | struct chain_allocator *ca) |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2421 | { |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2422 | return ERR_PTR(-EINVAL); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2423 | } |
| 2424 | |
| 2425 | static inline void copy_last_highmem_page(void) {} |
| 2426 | static inline int last_highmem_page_copied(void) { return 1; } |
| 2427 | static inline void free_highmem_data(void) {} |
| 2428 | #endif /* CONFIG_HIGHMEM */ |
| 2429 | |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2430 | #define PBES_PER_LINKED_PAGE (LINKED_PAGE_DATA_SIZE / sizeof(struct pbe)) |
Rafael J. Wysocki | 968808b8 | 2006-06-23 02:04:48 -0700 | [diff] [blame] | 2431 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2432 | /** |
| 2433 | * prepare_image - Make room for loading hibernation image. |
| 2434 | * @new_bm: Unitialized memory bitmap structure. |
| 2435 | * @bm: Memory bitmap with unsafe pages marked. |
| 2436 | * |
| 2437 | * Use @bm to mark the pages that will be overwritten in the process of |
| 2438 | * restoring the system memory state from the suspend image ("unsafe" pages) |
| 2439 | * and allocate memory for the image. |
| 2440 | * |
| 2441 | * The idea is to allocate a new memory bitmap first and then allocate |
| 2442 | * as many pages as needed for image data, but without specifying what those |
| 2443 | * pages will be used for just yet. Instead, we mark them all as allocated and |
| 2444 | * create a lists of "safe" pages to be used later. On systems with high |
| 2445 | * memory a list of "safe" highmem pages is created too. |
| 2446 | */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2447 | static int prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2448 | { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2449 | unsigned int nr_pages, nr_highmem; |
Rafael J. Wysocki | 9c74448 | 2016-06-29 03:00:51 +0200 | [diff] [blame] | 2450 | struct linked_page *lp; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2451 | int error; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2452 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2453 | /* If there is no highmem, the buffer will not be necessary */ |
| 2454 | free_image_page(buffer, PG_UNSAFE_CLEAR); |
| 2455 | buffer = NULL; |
| 2456 | |
| 2457 | nr_highmem = count_highmem_image_pages(bm); |
Rafael J. Wysocki | 6dbecfd | 2016-06-29 03:02:16 +0200 | [diff] [blame] | 2458 | mark_unsafe_pages(bm); |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2459 | |
| 2460 | error = memory_bm_create(new_bm, GFP_ATOMIC, PG_SAFE); |
| 2461 | if (error) |
| 2462 | goto Free; |
| 2463 | |
| 2464 | duplicate_memory_bitmap(new_bm, bm); |
| 2465 | memory_bm_free(bm, PG_UNSAFE_KEEP); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2466 | if (nr_highmem > 0) { |
| 2467 | error = prepare_highmem_image(bm, &nr_highmem); |
| 2468 | if (error) |
| 2469 | goto Free; |
| 2470 | } |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2471 | /* |
| 2472 | * Reserve some safe pages for potential later use. |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2473 | * |
| 2474 | * NOTE: This way we make sure there will be enough safe pages for the |
| 2475 | * chain_alloc() in get_buffer(). It is a bit wasteful, but |
| 2476 | * nr_copy_pages cannot be greater than 50% of the memory anyway. |
Rafael J. Wysocki | 9c74448 | 2016-06-29 03:00:51 +0200 | [diff] [blame] | 2477 | * |
| 2478 | * nr_copy_pages cannot be less than allocated_unsafe_pages too. |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2479 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2480 | nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2481 | nr_pages = DIV_ROUND_UP(nr_pages, PBES_PER_LINKED_PAGE); |
| 2482 | while (nr_pages > 0) { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2483 | lp = get_image_page(GFP_ATOMIC, PG_SAFE); |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2484 | if (!lp) { |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2485 | error = -ENOMEM; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2486 | goto Free; |
Rafael J. Wysocki | 968808b8 | 2006-06-23 02:04:48 -0700 | [diff] [blame] | 2487 | } |
Rafael J. Wysocki | 9c74448 | 2016-06-29 03:00:51 +0200 | [diff] [blame] | 2488 | lp->next = safe_pages_list; |
| 2489 | safe_pages_list = lp; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2490 | nr_pages--; |
Rafael J. Wysocki | 968808b8 | 2006-06-23 02:04:48 -0700 | [diff] [blame] | 2491 | } |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2492 | /* Preallocate memory for the image */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2493 | nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2494 | while (nr_pages > 0) { |
| 2495 | lp = (struct linked_page *)get_zeroed_page(GFP_ATOMIC); |
| 2496 | if (!lp) { |
| 2497 | error = -ENOMEM; |
| 2498 | goto Free; |
| 2499 | } |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 2500 | if (!swsusp_page_is_free(virt_to_page(lp))) { |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2501 | /* The page is "safe", add it to the list */ |
| 2502 | lp->next = safe_pages_list; |
| 2503 | safe_pages_list = lp; |
| 2504 | } |
| 2505 | /* Mark the page as allocated */ |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 2506 | swsusp_set_page_forbidden(virt_to_page(lp)); |
| 2507 | swsusp_set_page_free(virt_to_page(lp)); |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2508 | nr_pages--; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2509 | } |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2510 | return 0; |
| 2511 | |
Rafael J. Wysocki | 59a49335 | 2006-12-06 20:34:44 -0800 | [diff] [blame] | 2512 | Free: |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2513 | swsusp_free(); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2514 | return error; |
| 2515 | } |
| 2516 | |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2517 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2518 | * get_buffer - Get the address to store the next image data page. |
| 2519 | * |
| 2520 | * Get the address that snapshot_write_next() should return to its caller to |
| 2521 | * write to. |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2522 | */ |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2523 | static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca) |
| 2524 | { |
| 2525 | struct pbe *pbe; |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2526 | struct page *page; |
| 2527 | unsigned long pfn = memory_bm_next_pfn(bm); |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2528 | |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2529 | if (pfn == BM_END_OF_MAP) |
| 2530 | return ERR_PTR(-EFAULT); |
| 2531 | |
| 2532 | page = pfn_to_page(pfn); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2533 | if (PageHighMem(page)) |
| 2534 | return get_highmem_page_buffer(page, ca); |
| 2535 | |
Rafael J. Wysocki | 7be9823 | 2007-05-06 14:50:42 -0700 | [diff] [blame] | 2536 | if (swsusp_page_is_forbidden(page) && swsusp_page_is_free(page)) |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2537 | /* |
| 2538 | * We have allocated the "original" page frame and we can |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2539 | * use it directly to store the loaded page. |
Rafael J. Wysocki | 968808b8 | 2006-06-23 02:04:48 -0700 | [diff] [blame] | 2540 | */ |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2541 | return page_address(page); |
| 2542 | |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2543 | /* |
| 2544 | * The "original" page frame has not been allocated and we have to |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2545 | * use a "safe" page frame to store the loaded page. |
Rafael J. Wysocki | 968808b8 | 2006-06-23 02:04:48 -0700 | [diff] [blame] | 2546 | */ |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2547 | pbe = chain_alloc(ca, sizeof(struct pbe)); |
| 2548 | if (!pbe) { |
| 2549 | swsusp_free(); |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2550 | return ERR_PTR(-ENOMEM); |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2551 | } |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2552 | pbe->orig_address = page_address(page); |
| 2553 | pbe->address = safe_pages_list; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2554 | safe_pages_list = safe_pages_list->next; |
| 2555 | pbe->next = restore_pblist; |
| 2556 | restore_pblist = pbe; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2557 | return pbe->address; |
Rafael J. Wysocki | 968808b8 | 2006-06-23 02:04:48 -0700 | [diff] [blame] | 2558 | } |
| 2559 | |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2560 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2561 | * snapshot_write_next - Get the address to store the next image page. |
| 2562 | * @handle: Snapshot handle structure to guide the writing. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2563 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2564 | * On the first call, @handle should point to a zeroed snapshot_handle |
| 2565 | * structure. The structure gets populated then and a pointer to it should be |
| 2566 | * passed to this function every next time. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2567 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2568 | * On success, the function returns a positive number. Then, the caller |
| 2569 | * is allowed to write up to the returned number of bytes to the memory |
| 2570 | * location computed by the data_of() macro. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2571 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2572 | * The function returns 0 to indicate the "end of file" condition. Negative |
| 2573 | * numbers are returned on errors, in which cases the structure pointed to by |
| 2574 | * @handle is not updated and should not be used any more. |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2575 | */ |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2576 | int snapshot_write_next(struct snapshot_handle *handle) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2577 | { |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2578 | static struct chain_allocator ca; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2579 | int error = 0; |
| 2580 | |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2581 | /* Check if we have already loaded the entire image */ |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2582 | if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2583 | return 0; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2584 | |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2585 | handle->sync_read = 1; |
| 2586 | |
| 2587 | if (!handle->cur) { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2588 | if (!buffer) |
| 2589 | /* This makes the buffer be freed by swsusp_free() */ |
| 2590 | buffer = get_image_page(GFP_ATOMIC, PG_ANY); |
| 2591 | |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2592 | if (!buffer) |
| 2593 | return -ENOMEM; |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2594 | |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2595 | handle->buffer = buffer; |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2596 | } else if (handle->cur == 1) { |
| 2597 | error = load_header(buffer); |
| 2598 | if (error) |
| 2599 | return error; |
| 2600 | |
Rafael J. Wysocki | 9c74448 | 2016-06-29 03:00:51 +0200 | [diff] [blame] | 2601 | safe_pages_list = NULL; |
| 2602 | |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2603 | error = memory_bm_create(©_bm, GFP_ATOMIC, PG_ANY); |
| 2604 | if (error) |
| 2605 | return error; |
| 2606 | |
Martin Schwidefsky | 85055dd | 2011-08-17 20:42:24 +0200 | [diff] [blame] | 2607 | /* Allocate buffer for page keys. */ |
| 2608 | error = page_key_alloc(nr_copy_pages); |
| 2609 | if (error) |
| 2610 | return error; |
| 2611 | |
Rafael J. Wysocki | 4c0b6c1 | 2016-07-10 02:12:10 +0200 | [diff] [blame] | 2612 | hibernate_restore_protection_begin(); |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2613 | } else if (handle->cur <= nr_meta_pages + 1) { |
| 2614 | error = unpack_orig_pfns(buffer, ©_bm); |
| 2615 | if (error) |
| 2616 | return error; |
| 2617 | |
| 2618 | if (handle->cur == nr_meta_pages + 1) { |
| 2619 | error = prepare_image(&orig_bm, ©_bm); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2620 | if (error) |
| 2621 | return error; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2622 | |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2623 | chain_init(&ca, GFP_ATOMIC, PG_SAFE); |
| 2624 | memory_bm_position_reset(&orig_bm); |
| 2625 | restore_pblist = NULL; |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2626 | handle->buffer = get_buffer(&orig_bm, &ca); |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2627 | handle->sync_read = 0; |
Rafael J. Wysocki | 6964327 | 2008-11-11 21:32:44 +0100 | [diff] [blame] | 2628 | if (IS_ERR(handle->buffer)) |
| 2629 | return PTR_ERR(handle->buffer); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2630 | } |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2631 | } else { |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2632 | copy_last_highmem_page(); |
Martin Schwidefsky | 85055dd | 2011-08-17 20:42:24 +0200 | [diff] [blame] | 2633 | /* Restore page key for data page (s390 only). */ |
| 2634 | page_key_write(handle->buffer); |
Rafael J. Wysocki | 4c0b6c1 | 2016-07-10 02:12:10 +0200 | [diff] [blame] | 2635 | hibernate_restore_protect_page(handle->buffer); |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2636 | handle->buffer = get_buffer(&orig_bm, &ca); |
| 2637 | if (IS_ERR(handle->buffer)) |
| 2638 | return PTR_ERR(handle->buffer); |
| 2639 | if (handle->buffer != buffer) |
| 2640 | handle->sync_read = 0; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2641 | } |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2642 | handle->cur++; |
| 2643 | return PAGE_SIZE; |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2644 | } |
| 2645 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2646 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2647 | * snapshot_write_finalize - Complete the loading of a hibernation image. |
| 2648 | * |
| 2649 | * Must be called after the last call to snapshot_write_next() in case the last |
| 2650 | * page in the image happens to be a highmem page and its contents should be |
| 2651 | * stored in highmem. Additionally, it recycles bitmap memory that's not |
| 2652 | * necessary any more. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2653 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2654 | void snapshot_write_finalize(struct snapshot_handle *handle) |
| 2655 | { |
| 2656 | copy_last_highmem_page(); |
Martin Schwidefsky | 85055dd | 2011-08-17 20:42:24 +0200 | [diff] [blame] | 2657 | /* Restore page key for data page (s390 only). */ |
| 2658 | page_key_write(handle->buffer); |
| 2659 | page_key_free(); |
Rafael J. Wysocki | 4c0b6c1 | 2016-07-10 02:12:10 +0200 | [diff] [blame] | 2660 | hibernate_restore_protect_page(handle->buffer); |
Rafael J. Wysocki | 307c597 | 2016-06-29 03:05:10 +0200 | [diff] [blame] | 2661 | /* Do that only if we have loaded the image entirely */ |
Jiri Slaby | d3c1b24 | 2010-05-01 23:52:02 +0200 | [diff] [blame] | 2662 | if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) { |
Rafael J. Wysocki | 307c597 | 2016-06-29 03:05:10 +0200 | [diff] [blame] | 2663 | memory_bm_recycle(&orig_bm); |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2664 | free_highmem_data(); |
| 2665 | } |
| 2666 | } |
| 2667 | |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2668 | int snapshot_image_loaded(struct snapshot_handle *handle) |
| 2669 | { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2670 | return !(!nr_copy_pages || !last_highmem_page_copied() || |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2671 | handle->cur <= nr_meta_pages + nr_copy_pages); |
| 2672 | } |
| 2673 | |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2674 | #ifdef CONFIG_HIGHMEM |
| 2675 | /* Assumes that @buf is ready and points to a "safe" page */ |
Rafael J. Wysocki | efd5a85 | 2016-07-06 23:42:46 +0200 | [diff] [blame] | 2676 | static inline void swap_two_pages_data(struct page *p1, struct page *p2, |
| 2677 | void *buf) |
Rafael J. Wysocki | 940864d | 2006-09-25 23:32:55 -0700 | [diff] [blame] | 2678 | { |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2679 | void *kaddr1, *kaddr2; |
| 2680 | |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 2681 | kaddr1 = kmap_atomic(p1); |
| 2682 | kaddr2 = kmap_atomic(p2); |
Jan Beulich | 3ecb01d | 2010-10-26 14:22:27 -0700 | [diff] [blame] | 2683 | copy_page(buf, kaddr1); |
| 2684 | copy_page(kaddr1, kaddr2); |
| 2685 | copy_page(kaddr2, buf); |
Cong Wang | 0de9a1e | 2011-11-25 23:14:38 +0800 | [diff] [blame] | 2686 | kunmap_atomic(kaddr2); |
| 2687 | kunmap_atomic(kaddr1); |
Rafael J. Wysocki | f577eb3 | 2006-03-23 02:59:59 -0800 | [diff] [blame] | 2688 | } |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2689 | |
| 2690 | /** |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2691 | * restore_highmem - Put highmem image pages into their original locations. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2692 | * |
Rafael J. Wysocki | ef96f63 | 2016-07-06 23:43:46 +0200 | [diff] [blame] | 2693 | * For each highmem page that was in use before hibernation and is included in |
| 2694 | * the image, and also has been allocated by the "restore" kernel, swap its |
| 2695 | * current contents with the previous (ie. "before hibernation") ones. |
| 2696 | * |
| 2697 | * If the restore eventually fails, we can call this function once again and |
| 2698 | * restore the highmem state as seen by the restore kernel. |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2699 | */ |
Rafael J. Wysocki | 8357376 | 2006-12-06 20:34:18 -0800 | [diff] [blame] | 2700 | int restore_highmem(void) |
| 2701 | { |
| 2702 | struct highmem_pbe *pbe = highmem_pblist; |
| 2703 | void *buf; |
| 2704 | |
| 2705 | if (!pbe) |
| 2706 | return 0; |
| 2707 | |
| 2708 | buf = get_image_page(GFP_ATOMIC, PG_SAFE); |
| 2709 | if (!buf) |
| 2710 | return -ENOMEM; |
| 2711 | |
| 2712 | while (pbe) { |
| 2713 | swap_two_pages_data(pbe->copy_page, pbe->orig_page, buf); |
| 2714 | pbe = pbe->next; |
| 2715 | } |
| 2716 | free_image_page(buf, PG_UNSAFE_CLEAR); |
| 2717 | return 0; |
| 2718 | } |
| 2719 | #endif /* CONFIG_HIGHMEM */ |