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55716d26 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
25761b6e | 2 | /* |
96bc7aec | 3 | * linux/kernel/power/snapshot.c |
25761b6e | 4 | * |
8357376d | 5 | * This file provides system snapshot/restore functionality for swsusp. |
25761b6e | 6 | * |
a2531293 | 7 | * Copyright (C) 1998-2005 Pavel Machek <pavel@ucw.cz> |
8357376d | 8 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
25761b6e RW |
9 | */ |
10 | ||
64ec72a1 JP |
11 | #define pr_fmt(fmt) "PM: " fmt |
12 | ||
f577eb30 | 13 | #include <linux/version.h> |
25761b6e RW |
14 | #include <linux/module.h> |
15 | #include <linux/mm.h> | |
16 | #include <linux/suspend.h> | |
25761b6e | 17 | #include <linux/delay.h> |
25761b6e | 18 | #include <linux/bitops.h> |
25761b6e | 19 | #include <linux/spinlock.h> |
25761b6e | 20 | #include <linux/kernel.h> |
25761b6e RW |
21 | #include <linux/pm.h> |
22 | #include <linux/device.h> | |
74dfd666 | 23 | #include <linux/init.h> |
57c8a661 | 24 | #include <linux/memblock.h> |
38b8d208 | 25 | #include <linux/nmi.h> |
25761b6e RW |
26 | #include <linux/syscalls.h> |
27 | #include <linux/console.h> | |
28 | #include <linux/highmem.h> | |
846705de | 29 | #include <linux/list.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
52f5684c | 31 | #include <linux/compiler.h> |
db597605 | 32 | #include <linux/ktime.h> |
61f6d09a | 33 | #include <linux/set_memory.h> |
25761b6e | 34 | |
7c0f6ba6 | 35 | #include <linux/uaccess.h> |
25761b6e RW |
36 | #include <asm/mmu_context.h> |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/tlbflush.h> | |
39 | #include <asm/io.h> | |
40 | ||
25761b6e RW |
41 | #include "power.h" |
42 | ||
49368a47 | 43 | #if defined(CONFIG_STRICT_KERNEL_RWX) && defined(CONFIG_ARCH_HAS_SET_MEMORY) |
4c0b6c10 RW |
44 | static bool hibernate_restore_protection; |
45 | static bool hibernate_restore_protection_active; | |
46 | ||
47 | void enable_restore_image_protection(void) | |
48 | { | |
49 | hibernate_restore_protection = true; | |
50 | } | |
51 | ||
52 | static inline void hibernate_restore_protection_begin(void) | |
53 | { | |
54 | hibernate_restore_protection_active = hibernate_restore_protection; | |
55 | } | |
56 | ||
57 | static inline void hibernate_restore_protection_end(void) | |
58 | { | |
59 | hibernate_restore_protection_active = false; | |
60 | } | |
61 | ||
62 | static inline void hibernate_restore_protect_page(void *page_address) | |
63 | { | |
64 | if (hibernate_restore_protection_active) | |
65 | set_memory_ro((unsigned long)page_address, 1); | |
66 | } | |
67 | ||
68 | static inline void hibernate_restore_unprotect_page(void *page_address) | |
69 | { | |
70 | if (hibernate_restore_protection_active) | |
71 | set_memory_rw((unsigned long)page_address, 1); | |
72 | } | |
73 | #else | |
74 | static inline void hibernate_restore_protection_begin(void) {} | |
75 | static inline void hibernate_restore_protection_end(void) {} | |
76 | static inline void hibernate_restore_protect_page(void *page_address) {} | |
77 | static inline void hibernate_restore_unprotect_page(void *page_address) {} | |
49368a47 | 78 | #endif /* CONFIG_STRICT_KERNEL_RWX && CONFIG_ARCH_HAS_SET_MEMORY */ |
4c0b6c10 | 79 | |
74dfd666 RW |
80 | static int swsusp_page_is_free(struct page *); |
81 | static void swsusp_set_page_forbidden(struct page *); | |
82 | static void swsusp_unset_page_forbidden(struct page *); | |
83 | ||
ddeb6487 RW |
84 | /* |
85 | * Number of bytes to reserve for memory allocations made by device drivers | |
86 | * from their ->freeze() and ->freeze_noirq() callbacks so that they don't | |
87 | * cause image creation to fail (tunable via /sys/power/reserved_size). | |
88 | */ | |
89 | unsigned long reserved_size; | |
90 | ||
91 | void __init hibernate_reserved_size_init(void) | |
92 | { | |
93 | reserved_size = SPARE_PAGES * PAGE_SIZE; | |
94 | } | |
95 | ||
fe419535 RW |
96 | /* |
97 | * Preferred image size in bytes (tunable via /sys/power/image_size). | |
1c1be3a9 RW |
98 | * When it is set to N, swsusp will do its best to ensure the image |
99 | * size will not exceed N bytes, but if that is impossible, it will | |
100 | * try to create the smallest image possible. | |
fe419535 | 101 | */ |
ac5c24ec RW |
102 | unsigned long image_size; |
103 | ||
104 | void __init hibernate_image_size_init(void) | |
105 | { | |
ca79b0c2 | 106 | image_size = ((totalram_pages() * 2) / 5) * PAGE_SIZE; |
ac5c24ec | 107 | } |
fe419535 | 108 | |
ef96f639 RW |
109 | /* |
110 | * List of PBEs needed for restoring the pages that were allocated before | |
8357376d RW |
111 | * the suspend and included in the suspend image, but have also been |
112 | * allocated by the "resume" kernel, so their contents cannot be written | |
113 | * directly to their "original" page frames. | |
114 | */ | |
75534b50 RW |
115 | struct pbe *restore_pblist; |
116 | ||
9c744481 RW |
117 | /* struct linked_page is used to build chains of pages */ |
118 | ||
119 | #define LINKED_PAGE_DATA_SIZE (PAGE_SIZE - sizeof(void *)) | |
120 | ||
121 | struct linked_page { | |
122 | struct linked_page *next; | |
123 | char data[LINKED_PAGE_DATA_SIZE]; | |
124 | } __packed; | |
125 | ||
126 | /* | |
127 | * List of "safe" pages (ie. pages that were not used by the image kernel | |
128 | * before hibernation) that may be used as temporary storage for image kernel | |
129 | * memory contents. | |
130 | */ | |
131 | static struct linked_page *safe_pages_list; | |
132 | ||
8357376d | 133 | /* Pointer to an auxiliary buffer (1 page) */ |
940864dd | 134 | static void *buffer; |
7088a5c0 | 135 | |
0bcd888d RW |
136 | #define PG_ANY 0 |
137 | #define PG_SAFE 1 | |
138 | #define PG_UNSAFE_CLEAR 1 | |
139 | #define PG_UNSAFE_KEEP 0 | |
140 | ||
940864dd | 141 | static unsigned int allocated_unsafe_pages; |
f6143aa6 | 142 | |
ef96f639 RW |
143 | /** |
144 | * get_image_page - Allocate a page for a hibernation image. | |
145 | * @gfp_mask: GFP mask for the allocation. | |
146 | * @safe_needed: Get pages that were not used before hibernation (restore only) | |
147 | * | |
148 | * During image restoration, for storing the PBE list and the image data, we can | |
149 | * only use memory pages that do not conflict with the pages used before | |
150 | * hibernation. The "unsafe" pages have PageNosaveFree set and we count them | |
151 | * using allocated_unsafe_pages. | |
152 | * | |
153 | * Each allocated image page is marked as PageNosave and PageNosaveFree so that | |
154 | * swsusp_free() can release it. | |
155 | */ | |
8357376d | 156 | static void *get_image_page(gfp_t gfp_mask, int safe_needed) |
f6143aa6 RW |
157 | { |
158 | void *res; | |
159 | ||
160 | res = (void *)get_zeroed_page(gfp_mask); | |
161 | if (safe_needed) | |
7be98234 | 162 | while (res && swsusp_page_is_free(virt_to_page(res))) { |
f6143aa6 | 163 | /* The page is unsafe, mark it for swsusp_free() */ |
7be98234 | 164 | swsusp_set_page_forbidden(virt_to_page(res)); |
940864dd | 165 | allocated_unsafe_pages++; |
f6143aa6 RW |
166 | res = (void *)get_zeroed_page(gfp_mask); |
167 | } | |
168 | if (res) { | |
7be98234 RW |
169 | swsusp_set_page_forbidden(virt_to_page(res)); |
170 | swsusp_set_page_free(virt_to_page(res)); | |
f6143aa6 RW |
171 | } |
172 | return res; | |
173 | } | |
174 | ||
9c744481 RW |
175 | static void *__get_safe_page(gfp_t gfp_mask) |
176 | { | |
177 | if (safe_pages_list) { | |
178 | void *ret = safe_pages_list; | |
179 | ||
180 | safe_pages_list = safe_pages_list->next; | |
181 | memset(ret, 0, PAGE_SIZE); | |
182 | return ret; | |
183 | } | |
184 | return get_image_page(gfp_mask, PG_SAFE); | |
185 | } | |
186 | ||
f6143aa6 RW |
187 | unsigned long get_safe_page(gfp_t gfp_mask) |
188 | { | |
9c744481 | 189 | return (unsigned long)__get_safe_page(gfp_mask); |
8357376d RW |
190 | } |
191 | ||
5b6d15de RW |
192 | static struct page *alloc_image_page(gfp_t gfp_mask) |
193 | { | |
8357376d RW |
194 | struct page *page; |
195 | ||
196 | page = alloc_page(gfp_mask); | |
197 | if (page) { | |
7be98234 RW |
198 | swsusp_set_page_forbidden(page); |
199 | swsusp_set_page_free(page); | |
8357376d RW |
200 | } |
201 | return page; | |
f6143aa6 RW |
202 | } |
203 | ||
307c5971 RW |
204 | static void recycle_safe_page(void *page_address) |
205 | { | |
206 | struct linked_page *lp = page_address; | |
207 | ||
208 | lp->next = safe_pages_list; | |
209 | safe_pages_list = lp; | |
210 | } | |
211 | ||
f6143aa6 | 212 | /** |
ef96f639 RW |
213 | * free_image_page - Free a page allocated for hibernation image. |
214 | * @addr: Address of the page to free. | |
215 | * @clear_nosave_free: If set, clear the PageNosaveFree bit for the page. | |
216 | * | |
217 | * The page to free should have been allocated by get_image_page() (page flags | |
218 | * set by it are affected). | |
f6143aa6 | 219 | */ |
f6143aa6 RW |
220 | static inline void free_image_page(void *addr, int clear_nosave_free) |
221 | { | |
8357376d RW |
222 | struct page *page; |
223 | ||
224 | BUG_ON(!virt_addr_valid(addr)); | |
225 | ||
226 | page = virt_to_page(addr); | |
227 | ||
7be98234 | 228 | swsusp_unset_page_forbidden(page); |
f6143aa6 | 229 | if (clear_nosave_free) |
7be98234 | 230 | swsusp_unset_page_free(page); |
8357376d RW |
231 | |
232 | __free_page(page); | |
f6143aa6 RW |
233 | } |
234 | ||
efd5a852 RW |
235 | static inline void free_list_of_pages(struct linked_page *list, |
236 | int clear_page_nosave) | |
b788db79 RW |
237 | { |
238 | while (list) { | |
239 | struct linked_page *lp = list->next; | |
240 | ||
241 | free_image_page(list, clear_page_nosave); | |
242 | list = lp; | |
243 | } | |
244 | } | |
245 | ||
ef96f639 RW |
246 | /* |
247 | * struct chain_allocator is used for allocating small objects out of | |
248 | * a linked list of pages called 'the chain'. | |
249 | * | |
250 | * The chain grows each time when there is no room for a new object in | |
251 | * the current page. The allocated objects cannot be freed individually. | |
252 | * It is only possible to free them all at once, by freeing the entire | |
253 | * chain. | |
254 | * | |
255 | * NOTE: The chain allocator may be inefficient if the allocated objects | |
256 | * are not much smaller than PAGE_SIZE. | |
257 | */ | |
b788db79 RW |
258 | struct chain_allocator { |
259 | struct linked_page *chain; /* the chain */ | |
260 | unsigned int used_space; /* total size of objects allocated out | |
ef96f639 | 261 | of the current page */ |
b788db79 RW |
262 | gfp_t gfp_mask; /* mask for allocating pages */ |
263 | int safe_needed; /* if set, only "safe" pages are allocated */ | |
264 | }; | |
265 | ||
efd5a852 RW |
266 | static void chain_init(struct chain_allocator *ca, gfp_t gfp_mask, |
267 | int safe_needed) | |
b788db79 RW |
268 | { |
269 | ca->chain = NULL; | |
270 | ca->used_space = LINKED_PAGE_DATA_SIZE; | |
271 | ca->gfp_mask = gfp_mask; | |
272 | ca->safe_needed = safe_needed; | |
273 | } | |
274 | ||
275 | static void *chain_alloc(struct chain_allocator *ca, unsigned int size) | |
276 | { | |
277 | void *ret; | |
278 | ||
279 | if (LINKED_PAGE_DATA_SIZE - ca->used_space < size) { | |
280 | struct linked_page *lp; | |
281 | ||
9c744481 RW |
282 | lp = ca->safe_needed ? __get_safe_page(ca->gfp_mask) : |
283 | get_image_page(ca->gfp_mask, PG_ANY); | |
b788db79 RW |
284 | if (!lp) |
285 | return NULL; | |
286 | ||
287 | lp->next = ca->chain; | |
288 | ca->chain = lp; | |
289 | ca->used_space = 0; | |
290 | } | |
291 | ret = ca->chain->data + ca->used_space; | |
292 | ca->used_space += size; | |
293 | return ret; | |
294 | } | |
295 | ||
b788db79 | 296 | /** |
ef96f639 | 297 | * Data types related to memory bitmaps. |
b788db79 | 298 | * |
ef96f639 RW |
299 | * Memory bitmap is a structure consiting of many linked lists of |
300 | * objects. The main list's elements are of type struct zone_bitmap | |
301 | * and each of them corresonds to one zone. For each zone bitmap | |
302 | * object there is a list of objects of type struct bm_block that | |
303 | * represent each blocks of bitmap in which information is stored. | |
b788db79 | 304 | * |
ef96f639 RW |
305 | * struct memory_bitmap contains a pointer to the main list of zone |
306 | * bitmap objects, a struct bm_position used for browsing the bitmap, | |
307 | * and a pointer to the list of pages used for allocating all of the | |
308 | * zone bitmap objects and bitmap block objects. | |
b788db79 | 309 | * |
ef96f639 RW |
310 | * NOTE: It has to be possible to lay out the bitmap in memory |
311 | * using only allocations of order 0. Additionally, the bitmap is | |
312 | * designed to work with arbitrary number of zones (this is over the | |
313 | * top for now, but let's avoid making unnecessary assumptions ;-). | |
b788db79 | 314 | * |
ef96f639 RW |
315 | * struct zone_bitmap contains a pointer to a list of bitmap block |
316 | * objects and a pointer to the bitmap block object that has been | |
317 | * most recently used for setting bits. Additionally, it contains the | |
318 | * PFNs that correspond to the start and end of the represented zone. | |
b788db79 | 319 | * |
ef96f639 RW |
320 | * struct bm_block contains a pointer to the memory page in which |
321 | * information is stored (in the form of a block of bitmap) | |
322 | * It also contains the pfns that correspond to the start and end of | |
323 | * the represented memory area. | |
f469f02d | 324 | * |
ef96f639 RW |
325 | * The memory bitmap is organized as a radix tree to guarantee fast random |
326 | * access to the bits. There is one radix tree for each zone (as returned | |
327 | * from create_mem_extents). | |
f469f02d | 328 | * |
ef96f639 RW |
329 | * One radix tree is represented by one struct mem_zone_bm_rtree. There are |
330 | * two linked lists for the nodes of the tree, one for the inner nodes and | |
331 | * one for the leave nodes. The linked leave nodes are used for fast linear | |
332 | * access of the memory bitmap. | |
f469f02d | 333 | * |
ef96f639 | 334 | * The struct rtree_node represents one node of the radix tree. |
b788db79 RW |
335 | */ |
336 | ||
337 | #define BM_END_OF_MAP (~0UL) | |
338 | ||
8de03073 | 339 | #define BM_BITS_PER_BLOCK (PAGE_SIZE * BITS_PER_BYTE) |
f469f02d JR |
340 | #define BM_BLOCK_SHIFT (PAGE_SHIFT + 3) |
341 | #define BM_BLOCK_MASK ((1UL << BM_BLOCK_SHIFT) - 1) | |
b788db79 | 342 | |
f469f02d JR |
343 | /* |
344 | * struct rtree_node is a wrapper struct to link the nodes | |
345 | * of the rtree together for easy linear iteration over | |
346 | * bits and easy freeing | |
347 | */ | |
348 | struct rtree_node { | |
349 | struct list_head list; | |
350 | unsigned long *data; | |
351 | }; | |
352 | ||
353 | /* | |
354 | * struct mem_zone_bm_rtree represents a bitmap used for one | |
355 | * populated memory zone. | |
356 | */ | |
357 | struct mem_zone_bm_rtree { | |
358 | struct list_head list; /* Link Zones together */ | |
359 | struct list_head nodes; /* Radix Tree inner nodes */ | |
360 | struct list_head leaves; /* Radix Tree leaves */ | |
361 | unsigned long start_pfn; /* Zone start page frame */ | |
362 | unsigned long end_pfn; /* Zone end page frame + 1 */ | |
363 | struct rtree_node *rtree; /* Radix Tree Root */ | |
364 | int levels; /* Number of Radix Tree Levels */ | |
365 | unsigned int blocks; /* Number of Bitmap Blocks */ | |
366 | }; | |
367 | ||
b788db79 RW |
368 | /* strcut bm_position is used for browsing memory bitmaps */ |
369 | ||
370 | struct bm_position { | |
3a20cb17 JR |
371 | struct mem_zone_bm_rtree *zone; |
372 | struct rtree_node *node; | |
373 | unsigned long node_pfn; | |
374 | int node_bit; | |
b788db79 RW |
375 | }; |
376 | ||
377 | struct memory_bitmap { | |
f469f02d | 378 | struct list_head zones; |
b788db79 | 379 | struct linked_page *p_list; /* list of pages used to store zone |
ef96f639 RW |
380 | bitmap objects and bitmap block |
381 | objects */ | |
b788db79 RW |
382 | struct bm_position cur; /* most recently used bit position */ |
383 | }; | |
384 | ||
385 | /* Functions that operate on memory bitmaps */ | |
386 | ||
f469f02d JR |
387 | #define BM_ENTRIES_PER_LEVEL (PAGE_SIZE / sizeof(unsigned long)) |
388 | #if BITS_PER_LONG == 32 | |
389 | #define BM_RTREE_LEVEL_SHIFT (PAGE_SHIFT - 2) | |
390 | #else | |
391 | #define BM_RTREE_LEVEL_SHIFT (PAGE_SHIFT - 3) | |
392 | #endif | |
393 | #define BM_RTREE_LEVEL_MASK ((1UL << BM_RTREE_LEVEL_SHIFT) - 1) | |
394 | ||
ef96f639 RW |
395 | /** |
396 | * alloc_rtree_node - Allocate a new node and add it to the radix tree. | |
f469f02d | 397 | * |
ef96f639 RW |
398 | * This function is used to allocate inner nodes as well as the |
399 | * leave nodes of the radix tree. It also adds the node to the | |
400 | * corresponding linked list passed in by the *list parameter. | |
f469f02d JR |
401 | */ |
402 | static struct rtree_node *alloc_rtree_node(gfp_t gfp_mask, int safe_needed, | |
403 | struct chain_allocator *ca, | |
404 | struct list_head *list) | |
405 | { | |
406 | struct rtree_node *node; | |
407 | ||
408 | node = chain_alloc(ca, sizeof(struct rtree_node)); | |
409 | if (!node) | |
410 | return NULL; | |
411 | ||
412 | node->data = get_image_page(gfp_mask, safe_needed); | |
413 | if (!node->data) | |
414 | return NULL; | |
415 | ||
416 | list_add_tail(&node->list, list); | |
417 | ||
418 | return node; | |
419 | } | |
420 | ||
ef96f639 RW |
421 | /** |
422 | * add_rtree_block - Add a new leave node to the radix tree. | |
f469f02d | 423 | * |
ef96f639 RW |
424 | * The leave nodes need to be allocated in order to keep the leaves |
425 | * linked list in order. This is guaranteed by the zone->blocks | |
426 | * counter. | |
f469f02d JR |
427 | */ |
428 | static int add_rtree_block(struct mem_zone_bm_rtree *zone, gfp_t gfp_mask, | |
429 | int safe_needed, struct chain_allocator *ca) | |
430 | { | |
431 | struct rtree_node *node, *block, **dst; | |
432 | unsigned int levels_needed, block_nr; | |
433 | int i; | |
434 | ||
435 | block_nr = zone->blocks; | |
436 | levels_needed = 0; | |
437 | ||
438 | /* How many levels do we need for this block nr? */ | |
439 | while (block_nr) { | |
440 | levels_needed += 1; | |
441 | block_nr >>= BM_RTREE_LEVEL_SHIFT; | |
442 | } | |
443 | ||
444 | /* Make sure the rtree has enough levels */ | |
445 | for (i = zone->levels; i < levels_needed; i++) { | |
446 | node = alloc_rtree_node(gfp_mask, safe_needed, ca, | |
447 | &zone->nodes); | |
448 | if (!node) | |
449 | return -ENOMEM; | |
450 | ||
451 | node->data[0] = (unsigned long)zone->rtree; | |
452 | zone->rtree = node; | |
453 | zone->levels += 1; | |
454 | } | |
455 | ||
456 | /* Allocate new block */ | |
457 | block = alloc_rtree_node(gfp_mask, safe_needed, ca, &zone->leaves); | |
458 | if (!block) | |
459 | return -ENOMEM; | |
460 | ||
461 | /* Now walk the rtree to insert the block */ | |
462 | node = zone->rtree; | |
463 | dst = &zone->rtree; | |
464 | block_nr = zone->blocks; | |
465 | for (i = zone->levels; i > 0; i--) { | |
466 | int index; | |
467 | ||
468 | if (!node) { | |
469 | node = alloc_rtree_node(gfp_mask, safe_needed, ca, | |
470 | &zone->nodes); | |
471 | if (!node) | |
472 | return -ENOMEM; | |
473 | *dst = node; | |
474 | } | |
475 | ||
476 | index = block_nr >> ((i - 1) * BM_RTREE_LEVEL_SHIFT); | |
477 | index &= BM_RTREE_LEVEL_MASK; | |
478 | dst = (struct rtree_node **)&((*dst)->data[index]); | |
479 | node = *dst; | |
480 | } | |
481 | ||
482 | zone->blocks += 1; | |
483 | *dst = block; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | static void free_zone_bm_rtree(struct mem_zone_bm_rtree *zone, | |
489 | int clear_nosave_free); | |
490 | ||
ef96f639 RW |
491 | /** |
492 | * create_zone_bm_rtree - Create a radix tree for one zone. | |
f469f02d | 493 | * |
ef96f639 RW |
494 | * Allocated the mem_zone_bm_rtree structure and initializes it. |
495 | * This function also allocated and builds the radix tree for the | |
496 | * zone. | |
f469f02d | 497 | */ |
efd5a852 RW |
498 | static struct mem_zone_bm_rtree *create_zone_bm_rtree(gfp_t gfp_mask, |
499 | int safe_needed, | |
500 | struct chain_allocator *ca, | |
501 | unsigned long start, | |
502 | unsigned long end) | |
f469f02d JR |
503 | { |
504 | struct mem_zone_bm_rtree *zone; | |
505 | unsigned int i, nr_blocks; | |
506 | unsigned long pages; | |
507 | ||
508 | pages = end - start; | |
509 | zone = chain_alloc(ca, sizeof(struct mem_zone_bm_rtree)); | |
510 | if (!zone) | |
511 | return NULL; | |
512 | ||
513 | INIT_LIST_HEAD(&zone->nodes); | |
514 | INIT_LIST_HEAD(&zone->leaves); | |
515 | zone->start_pfn = start; | |
516 | zone->end_pfn = end; | |
517 | nr_blocks = DIV_ROUND_UP(pages, BM_BITS_PER_BLOCK); | |
518 | ||
519 | for (i = 0; i < nr_blocks; i++) { | |
520 | if (add_rtree_block(zone, gfp_mask, safe_needed, ca)) { | |
521 | free_zone_bm_rtree(zone, PG_UNSAFE_CLEAR); | |
522 | return NULL; | |
523 | } | |
524 | } | |
525 | ||
526 | return zone; | |
527 | } | |
528 | ||
ef96f639 RW |
529 | /** |
530 | * free_zone_bm_rtree - Free the memory of the radix tree. | |
f469f02d | 531 | * |
ef96f639 RW |
532 | * Free all node pages of the radix tree. The mem_zone_bm_rtree |
533 | * structure itself is not freed here nor are the rtree_node | |
534 | * structs. | |
f469f02d JR |
535 | */ |
536 | static void free_zone_bm_rtree(struct mem_zone_bm_rtree *zone, | |
537 | int clear_nosave_free) | |
538 | { | |
539 | struct rtree_node *node; | |
540 | ||
541 | list_for_each_entry(node, &zone->nodes, list) | |
542 | free_image_page(node->data, clear_nosave_free); | |
543 | ||
544 | list_for_each_entry(node, &zone->leaves, list) | |
545 | free_image_page(node->data, clear_nosave_free); | |
546 | } | |
547 | ||
b788db79 RW |
548 | static void memory_bm_position_reset(struct memory_bitmap *bm) |
549 | { | |
3a20cb17 JR |
550 | bm->cur.zone = list_entry(bm->zones.next, struct mem_zone_bm_rtree, |
551 | list); | |
552 | bm->cur.node = list_entry(bm->cur.zone->leaves.next, | |
553 | struct rtree_node, list); | |
554 | bm->cur.node_pfn = 0; | |
555 | bm->cur.node_bit = 0; | |
b788db79 RW |
556 | } |
557 | ||
558 | static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free); | |
559 | ||
846705de RW |
560 | struct mem_extent { |
561 | struct list_head hook; | |
562 | unsigned long start; | |
563 | unsigned long end; | |
564 | }; | |
565 | ||
b788db79 | 566 | /** |
ef96f639 RW |
567 | * free_mem_extents - Free a list of memory extents. |
568 | * @list: List of extents to free. | |
b788db79 | 569 | */ |
846705de RW |
570 | static void free_mem_extents(struct list_head *list) |
571 | { | |
572 | struct mem_extent *ext, *aux; | |
b788db79 | 573 | |
846705de RW |
574 | list_for_each_entry_safe(ext, aux, list, hook) { |
575 | list_del(&ext->hook); | |
576 | kfree(ext); | |
577 | } | |
578 | } | |
579 | ||
580 | /** | |
ef96f639 RW |
581 | * create_mem_extents - Create a list of memory extents. |
582 | * @list: List to put the extents into. | |
583 | * @gfp_mask: Mask to use for memory allocations. | |
584 | * | |
585 | * The extents represent contiguous ranges of PFNs. | |
846705de RW |
586 | */ |
587 | static int create_mem_extents(struct list_head *list, gfp_t gfp_mask) | |
b788db79 | 588 | { |
846705de | 589 | struct zone *zone; |
b788db79 | 590 | |
846705de | 591 | INIT_LIST_HEAD(list); |
b788db79 | 592 | |
ee99c71c | 593 | for_each_populated_zone(zone) { |
846705de RW |
594 | unsigned long zone_start, zone_end; |
595 | struct mem_extent *ext, *cur, *aux; | |
596 | ||
846705de | 597 | zone_start = zone->zone_start_pfn; |
c33bc315 | 598 | zone_end = zone_end_pfn(zone); |
846705de RW |
599 | |
600 | list_for_each_entry(ext, list, hook) | |
601 | if (zone_start <= ext->end) | |
602 | break; | |
b788db79 | 603 | |
846705de RW |
604 | if (&ext->hook == list || zone_end < ext->start) { |
605 | /* New extent is necessary */ | |
606 | struct mem_extent *new_ext; | |
607 | ||
608 | new_ext = kzalloc(sizeof(struct mem_extent), gfp_mask); | |
609 | if (!new_ext) { | |
610 | free_mem_extents(list); | |
611 | return -ENOMEM; | |
612 | } | |
613 | new_ext->start = zone_start; | |
614 | new_ext->end = zone_end; | |
615 | list_add_tail(&new_ext->hook, &ext->hook); | |
616 | continue; | |
617 | } | |
618 | ||
619 | /* Merge this zone's range of PFNs with the existing one */ | |
620 | if (zone_start < ext->start) | |
621 | ext->start = zone_start; | |
622 | if (zone_end > ext->end) | |
623 | ext->end = zone_end; | |
624 | ||
625 | /* More merging may be possible */ | |
626 | cur = ext; | |
627 | list_for_each_entry_safe_continue(cur, aux, list, hook) { | |
628 | if (zone_end < cur->start) | |
629 | break; | |
630 | if (zone_end < cur->end) | |
631 | ext->end = cur->end; | |
632 | list_del(&cur->hook); | |
633 | kfree(cur); | |
634 | } | |
b788db79 | 635 | } |
846705de RW |
636 | |
637 | return 0; | |
b788db79 RW |
638 | } |
639 | ||
640 | /** | |
ef96f639 RW |
641 | * memory_bm_create - Allocate memory for a memory bitmap. |
642 | */ | |
efd5a852 RW |
643 | static int memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask, |
644 | int safe_needed) | |
b788db79 RW |
645 | { |
646 | struct chain_allocator ca; | |
846705de RW |
647 | struct list_head mem_extents; |
648 | struct mem_extent *ext; | |
649 | int error; | |
b788db79 RW |
650 | |
651 | chain_init(&ca, gfp_mask, safe_needed); | |
f469f02d | 652 | INIT_LIST_HEAD(&bm->zones); |
b788db79 | 653 | |
846705de RW |
654 | error = create_mem_extents(&mem_extents, gfp_mask); |
655 | if (error) | |
656 | return error; | |
b788db79 | 657 | |
846705de | 658 | list_for_each_entry(ext, &mem_extents, hook) { |
f469f02d | 659 | struct mem_zone_bm_rtree *zone; |
f469f02d JR |
660 | |
661 | zone = create_zone_bm_rtree(gfp_mask, safe_needed, &ca, | |
662 | ext->start, ext->end); | |
9047eb62 JR |
663 | if (!zone) { |
664 | error = -ENOMEM; | |
f469f02d | 665 | goto Error; |
9047eb62 | 666 | } |
f469f02d | 667 | list_add_tail(&zone->list, &bm->zones); |
b788db79 | 668 | } |
846705de | 669 | |
b788db79 RW |
670 | bm->p_list = ca.chain; |
671 | memory_bm_position_reset(bm); | |
846705de RW |
672 | Exit: |
673 | free_mem_extents(&mem_extents); | |
674 | return error; | |
b788db79 | 675 | |
846705de | 676 | Error: |
b788db79 RW |
677 | bm->p_list = ca.chain; |
678 | memory_bm_free(bm, PG_UNSAFE_CLEAR); | |
846705de | 679 | goto Exit; |
b788db79 RW |
680 | } |
681 | ||
682 | /** | |
ef96f639 RW |
683 | * memory_bm_free - Free memory occupied by the memory bitmap. |
684 | * @bm: Memory bitmap. | |
685 | */ | |
b788db79 RW |
686 | static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free) |
687 | { | |
f469f02d | 688 | struct mem_zone_bm_rtree *zone; |
b788db79 | 689 | |
f469f02d JR |
690 | list_for_each_entry(zone, &bm->zones, list) |
691 | free_zone_bm_rtree(zone, clear_nosave_free); | |
692 | ||
b788db79 | 693 | free_list_of_pages(bm->p_list, clear_nosave_free); |
846705de | 694 | |
f469f02d | 695 | INIT_LIST_HEAD(&bm->zones); |
b788db79 RW |
696 | } |
697 | ||
698 | /** | |
ef96f639 | 699 | * memory_bm_find_bit - Find the bit for a given PFN in a memory bitmap. |
07a33823 | 700 | * |
ef96f639 RW |
701 | * Find the bit in memory bitmap @bm that corresponds to the given PFN. |
702 | * The cur.zone, cur.block and cur.node_pfn members of @bm are updated. | |
703 | * | |
704 | * Walk the radix tree to find the page containing the bit that represents @pfn | |
705 | * and return the position of the bit in @addr and @bit_nr. | |
07a33823 | 706 | */ |
9047eb62 JR |
707 | static int memory_bm_find_bit(struct memory_bitmap *bm, unsigned long pfn, |
708 | void **addr, unsigned int *bit_nr) | |
07a33823 JR |
709 | { |
710 | struct mem_zone_bm_rtree *curr, *zone; | |
711 | struct rtree_node *node; | |
712 | int i, block_nr; | |
713 | ||
3a20cb17 JR |
714 | zone = bm->cur.zone; |
715 | ||
716 | if (pfn >= zone->start_pfn && pfn < zone->end_pfn) | |
717 | goto zone_found; | |
718 | ||
07a33823 JR |
719 | zone = NULL; |
720 | ||
721 | /* Find the right zone */ | |
722 | list_for_each_entry(curr, &bm->zones, list) { | |
723 | if (pfn >= curr->start_pfn && pfn < curr->end_pfn) { | |
724 | zone = curr; | |
725 | break; | |
726 | } | |
727 | } | |
728 | ||
729 | if (!zone) | |
730 | return -EFAULT; | |
731 | ||
3a20cb17 | 732 | zone_found: |
07a33823 | 733 | /* |
ef96f639 RW |
734 | * We have found the zone. Now walk the radix tree to find the leaf node |
735 | * for our PFN. | |
07a33823 | 736 | */ |
3a20cb17 JR |
737 | node = bm->cur.node; |
738 | if (((pfn - zone->start_pfn) & ~BM_BLOCK_MASK) == bm->cur.node_pfn) | |
739 | goto node_found; | |
740 | ||
07a33823 JR |
741 | node = zone->rtree; |
742 | block_nr = (pfn - zone->start_pfn) >> BM_BLOCK_SHIFT; | |
743 | ||
744 | for (i = zone->levels; i > 0; i--) { | |
745 | int index; | |
746 | ||
747 | index = block_nr >> ((i - 1) * BM_RTREE_LEVEL_SHIFT); | |
748 | index &= BM_RTREE_LEVEL_MASK; | |
749 | BUG_ON(node->data[index] == 0); | |
750 | node = (struct rtree_node *)node->data[index]; | |
751 | } | |
752 | ||
3a20cb17 JR |
753 | node_found: |
754 | /* Update last position */ | |
755 | bm->cur.zone = zone; | |
756 | bm->cur.node = node; | |
757 | bm->cur.node_pfn = (pfn - zone->start_pfn) & ~BM_BLOCK_MASK; | |
758 | ||
07a33823 JR |
759 | /* Set return values */ |
760 | *addr = node->data; | |
761 | *bit_nr = (pfn - zone->start_pfn) & BM_BLOCK_MASK; | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
74dfd666 RW |
766 | static void memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn) |
767 | { | |
768 | void *addr; | |
769 | unsigned int bit; | |
a82f7119 | 770 | int error; |
74dfd666 | 771 | |
a82f7119 RW |
772 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
773 | BUG_ON(error); | |
74dfd666 RW |
774 | set_bit(bit, addr); |
775 | } | |
776 | ||
a82f7119 RW |
777 | static int mem_bm_set_bit_check(struct memory_bitmap *bm, unsigned long pfn) |
778 | { | |
779 | void *addr; | |
780 | unsigned int bit; | |
781 | int error; | |
782 | ||
783 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); | |
07a33823 JR |
784 | if (!error) |
785 | set_bit(bit, addr); | |
786 | ||
a82f7119 RW |
787 | return error; |
788 | } | |
789 | ||
74dfd666 RW |
790 | static void memory_bm_clear_bit(struct memory_bitmap *bm, unsigned long pfn) |
791 | { | |
792 | void *addr; | |
793 | unsigned int bit; | |
a82f7119 | 794 | int error; |
74dfd666 | 795 | |
a82f7119 RW |
796 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
797 | BUG_ON(error); | |
74dfd666 RW |
798 | clear_bit(bit, addr); |
799 | } | |
800 | ||
fdd64ed5 JR |
801 | static void memory_bm_clear_current(struct memory_bitmap *bm) |
802 | { | |
803 | int bit; | |
804 | ||
805 | bit = max(bm->cur.node_bit - 1, 0); | |
806 | clear_bit(bit, bm->cur.node->data); | |
807 | } | |
808 | ||
74dfd666 RW |
809 | static int memory_bm_test_bit(struct memory_bitmap *bm, unsigned long pfn) |
810 | { | |
811 | void *addr; | |
812 | unsigned int bit; | |
9047eb62 | 813 | int error; |
74dfd666 | 814 | |
a82f7119 RW |
815 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
816 | BUG_ON(error); | |
9047eb62 | 817 | return test_bit(bit, addr); |
b788db79 RW |
818 | } |
819 | ||
69643279 RW |
820 | static bool memory_bm_pfn_present(struct memory_bitmap *bm, unsigned long pfn) |
821 | { | |
822 | void *addr; | |
823 | unsigned int bit; | |
07a33823 | 824 | |
9047eb62 | 825 | return !memory_bm_find_bit(bm, pfn, &addr, &bit); |
b788db79 RW |
826 | } |
827 | ||
3a20cb17 | 828 | /* |
ef96f639 | 829 | * rtree_next_node - Jump to the next leaf node. |
3a20cb17 | 830 | * |
ef96f639 RW |
831 | * Set the position to the beginning of the next node in the |
832 | * memory bitmap. This is either the next node in the current | |
833 | * zone's radix tree or the first node in the radix tree of the | |
834 | * next zone. | |
3a20cb17 | 835 | * |
ef96f639 | 836 | * Return true if there is a next node, false otherwise. |
3a20cb17 JR |
837 | */ |
838 | static bool rtree_next_node(struct memory_bitmap *bm) | |
839 | { | |
924d8696 JM |
840 | if (!list_is_last(&bm->cur.node->list, &bm->cur.zone->leaves)) { |
841 | bm->cur.node = list_entry(bm->cur.node->list.next, | |
842 | struct rtree_node, list); | |
3a20cb17 JR |
843 | bm->cur.node_pfn += BM_BITS_PER_BLOCK; |
844 | bm->cur.node_bit = 0; | |
0f7d83e8 | 845 | touch_softlockup_watchdog(); |
3a20cb17 JR |
846 | return true; |
847 | } | |
848 | ||
849 | /* No more nodes, goto next zone */ | |
924d8696 JM |
850 | if (!list_is_last(&bm->cur.zone->list, &bm->zones)) { |
851 | bm->cur.zone = list_entry(bm->cur.zone->list.next, | |
3a20cb17 | 852 | struct mem_zone_bm_rtree, list); |
3a20cb17 JR |
853 | bm->cur.node = list_entry(bm->cur.zone->leaves.next, |
854 | struct rtree_node, list); | |
855 | bm->cur.node_pfn = 0; | |
856 | bm->cur.node_bit = 0; | |
857 | return true; | |
858 | } | |
859 | ||
860 | /* No more zones */ | |
861 | return false; | |
862 | } | |
863 | ||
9047eb62 | 864 | /** |
ef96f639 RW |
865 | * memory_bm_rtree_next_pfn - Find the next set bit in a memory bitmap. |
866 | * @bm: Memory bitmap. | |
3a20cb17 | 867 | * |
ef96f639 RW |
868 | * Starting from the last returned position this function searches for the next |
869 | * set bit in @bm and returns the PFN represented by it. If no more bits are | |
870 | * set, BM_END_OF_MAP is returned. | |
9047eb62 | 871 | * |
ef96f639 RW |
872 | * It is required to run memory_bm_position_reset() before the first call to |
873 | * this function for the given memory bitmap. | |
3a20cb17 | 874 | */ |
9047eb62 | 875 | static unsigned long memory_bm_next_pfn(struct memory_bitmap *bm) |
3a20cb17 JR |
876 | { |
877 | unsigned long bits, pfn, pages; | |
878 | int bit; | |
879 | ||
880 | do { | |
881 | pages = bm->cur.zone->end_pfn - bm->cur.zone->start_pfn; | |
882 | bits = min(pages - bm->cur.node_pfn, BM_BITS_PER_BLOCK); | |
883 | bit = find_next_bit(bm->cur.node->data, bits, | |
884 | bm->cur.node_bit); | |
885 | if (bit < bits) { | |
886 | pfn = bm->cur.zone->start_pfn + bm->cur.node_pfn + bit; | |
887 | bm->cur.node_bit = bit + 1; | |
888 | return pfn; | |
889 | } | |
890 | } while (rtree_next_node(bm)); | |
891 | ||
892 | return BM_END_OF_MAP; | |
893 | } | |
894 | ||
ef96f639 RW |
895 | /* |
896 | * This structure represents a range of page frames the contents of which | |
897 | * should not be saved during hibernation. | |
74dfd666 | 898 | */ |
74dfd666 RW |
899 | struct nosave_region { |
900 | struct list_head list; | |
901 | unsigned long start_pfn; | |
902 | unsigned long end_pfn; | |
903 | }; | |
904 | ||
905 | static LIST_HEAD(nosave_regions); | |
906 | ||
307c5971 RW |
907 | static void recycle_zone_bm_rtree(struct mem_zone_bm_rtree *zone) |
908 | { | |
909 | struct rtree_node *node; | |
910 | ||
911 | list_for_each_entry(node, &zone->nodes, list) | |
912 | recycle_safe_page(node->data); | |
913 | ||
914 | list_for_each_entry(node, &zone->leaves, list) | |
915 | recycle_safe_page(node->data); | |
916 | } | |
917 | ||
918 | static void memory_bm_recycle(struct memory_bitmap *bm) | |
919 | { | |
920 | struct mem_zone_bm_rtree *zone; | |
921 | struct linked_page *p_list; | |
922 | ||
923 | list_for_each_entry(zone, &bm->zones, list) | |
924 | recycle_zone_bm_rtree(zone); | |
925 | ||
926 | p_list = bm->p_list; | |
927 | while (p_list) { | |
928 | struct linked_page *lp = p_list; | |
929 | ||
930 | p_list = lp->next; | |
931 | recycle_safe_page(lp); | |
932 | } | |
933 | } | |
934 | ||
74dfd666 | 935 | /** |
ef96f639 RW |
936 | * register_nosave_region - Register a region of unsaveable memory. |
937 | * | |
938 | * Register a range of page frames the contents of which should not be saved | |
939 | * during hibernation (to be used in the early initialization code). | |
74dfd666 | 940 | */ |
efd5a852 RW |
941 | void __init __register_nosave_region(unsigned long start_pfn, |
942 | unsigned long end_pfn, int use_kmalloc) | |
74dfd666 RW |
943 | { |
944 | struct nosave_region *region; | |
945 | ||
946 | if (start_pfn >= end_pfn) | |
947 | return; | |
948 | ||
949 | if (!list_empty(&nosave_regions)) { | |
950 | /* Try to extend the previous region (they should be sorted) */ | |
951 | region = list_entry(nosave_regions.prev, | |
952 | struct nosave_region, list); | |
953 | if (region->end_pfn == start_pfn) { | |
954 | region->end_pfn = end_pfn; | |
955 | goto Report; | |
956 | } | |
957 | } | |
940d67f6 | 958 | if (use_kmalloc) { |
ef96f639 | 959 | /* During init, this shouldn't fail */ |
940d67f6 JB |
960 | region = kmalloc(sizeof(struct nosave_region), GFP_KERNEL); |
961 | BUG_ON(!region); | |
d5f32af3 | 962 | } else { |
940d67f6 | 963 | /* This allocation cannot fail */ |
7e1c4e27 MR |
964 | region = memblock_alloc(sizeof(struct nosave_region), |
965 | SMP_CACHE_BYTES); | |
8a7f97b9 MR |
966 | if (!region) |
967 | panic("%s: Failed to allocate %zu bytes\n", __func__, | |
968 | sizeof(struct nosave_region)); | |
d5f32af3 | 969 | } |
74dfd666 RW |
970 | region->start_pfn = start_pfn; |
971 | region->end_pfn = end_pfn; | |
972 | list_add_tail(®ion->list, &nosave_regions); | |
973 | Report: | |
64ec72a1 | 974 | pr_info("Registered nosave memory: [mem %#010llx-%#010llx]\n", |
cd38ca85 BH |
975 | (unsigned long long) start_pfn << PAGE_SHIFT, |
976 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
74dfd666 RW |
977 | } |
978 | ||
979 | /* | |
980 | * Set bits in this map correspond to the page frames the contents of which | |
981 | * should not be saved during the suspend. | |
982 | */ | |
983 | static struct memory_bitmap *forbidden_pages_map; | |
984 | ||
985 | /* Set bits in this map correspond to free page frames. */ | |
986 | static struct memory_bitmap *free_pages_map; | |
987 | ||
988 | /* | |
989 | * Each page frame allocated for creating the image is marked by setting the | |
990 | * corresponding bits in forbidden_pages_map and free_pages_map simultaneously | |
991 | */ | |
992 | ||
993 | void swsusp_set_page_free(struct page *page) | |
994 | { | |
995 | if (free_pages_map) | |
996 | memory_bm_set_bit(free_pages_map, page_to_pfn(page)); | |
997 | } | |
998 | ||
999 | static int swsusp_page_is_free(struct page *page) | |
1000 | { | |
1001 | return free_pages_map ? | |
1002 | memory_bm_test_bit(free_pages_map, page_to_pfn(page)) : 0; | |
1003 | } | |
1004 | ||
1005 | void swsusp_unset_page_free(struct page *page) | |
1006 | { | |
1007 | if (free_pages_map) | |
1008 | memory_bm_clear_bit(free_pages_map, page_to_pfn(page)); | |
1009 | } | |
1010 | ||
1011 | static void swsusp_set_page_forbidden(struct page *page) | |
1012 | { | |
1013 | if (forbidden_pages_map) | |
1014 | memory_bm_set_bit(forbidden_pages_map, page_to_pfn(page)); | |
1015 | } | |
1016 | ||
1017 | int swsusp_page_is_forbidden(struct page *page) | |
1018 | { | |
1019 | return forbidden_pages_map ? | |
1020 | memory_bm_test_bit(forbidden_pages_map, page_to_pfn(page)) : 0; | |
1021 | } | |
1022 | ||
1023 | static void swsusp_unset_page_forbidden(struct page *page) | |
1024 | { | |
1025 | if (forbidden_pages_map) | |
1026 | memory_bm_clear_bit(forbidden_pages_map, page_to_pfn(page)); | |
1027 | } | |
1028 | ||
1029 | /** | |
ef96f639 RW |
1030 | * mark_nosave_pages - Mark pages that should not be saved. |
1031 | * @bm: Memory bitmap. | |
1032 | * | |
1033 | * Set the bits in @bm that correspond to the page frames the contents of which | |
1034 | * should not be saved. | |
74dfd666 | 1035 | */ |
74dfd666 RW |
1036 | static void mark_nosave_pages(struct memory_bitmap *bm) |
1037 | { | |
1038 | struct nosave_region *region; | |
1039 | ||
1040 | if (list_empty(&nosave_regions)) | |
1041 | return; | |
1042 | ||
1043 | list_for_each_entry(region, &nosave_regions, list) { | |
1044 | unsigned long pfn; | |
1045 | ||
64ec72a1 | 1046 | pr_debug("Marking nosave pages: [mem %#010llx-%#010llx]\n", |
69f1d475 BH |
1047 | (unsigned long long) region->start_pfn << PAGE_SHIFT, |
1048 | ((unsigned long long) region->end_pfn << PAGE_SHIFT) | |
1049 | - 1); | |
74dfd666 RW |
1050 | |
1051 | for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++) | |
a82f7119 RW |
1052 | if (pfn_valid(pfn)) { |
1053 | /* | |
1054 | * It is safe to ignore the result of | |
1055 | * mem_bm_set_bit_check() here, since we won't | |
1056 | * touch the PFNs for which the error is | |
1057 | * returned anyway. | |
1058 | */ | |
1059 | mem_bm_set_bit_check(bm, pfn); | |
1060 | } | |
74dfd666 RW |
1061 | } |
1062 | } | |
1063 | ||
1064 | /** | |
ef96f639 RW |
1065 | * create_basic_memory_bitmaps - Create bitmaps to hold basic page information. |
1066 | * | |
1067 | * Create bitmaps needed for marking page frames that should not be saved and | |
1068 | * free page frames. The forbidden_pages_map and free_pages_map pointers are | |
1069 | * only modified if everything goes well, because we don't want the bits to be | |
1070 | * touched before both bitmaps are set up. | |
74dfd666 | 1071 | */ |
74dfd666 RW |
1072 | int create_basic_memory_bitmaps(void) |
1073 | { | |
1074 | struct memory_bitmap *bm1, *bm2; | |
1075 | int error = 0; | |
1076 | ||
aab17289 RW |
1077 | if (forbidden_pages_map && free_pages_map) |
1078 | return 0; | |
1079 | else | |
1080 | BUG_ON(forbidden_pages_map || free_pages_map); | |
74dfd666 | 1081 | |
0709db60 | 1082 | bm1 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL); |
74dfd666 RW |
1083 | if (!bm1) |
1084 | return -ENOMEM; | |
1085 | ||
0709db60 | 1086 | error = memory_bm_create(bm1, GFP_KERNEL, PG_ANY); |
74dfd666 RW |
1087 | if (error) |
1088 | goto Free_first_object; | |
1089 | ||
0709db60 | 1090 | bm2 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL); |
74dfd666 RW |
1091 | if (!bm2) |
1092 | goto Free_first_bitmap; | |
1093 | ||
0709db60 | 1094 | error = memory_bm_create(bm2, GFP_KERNEL, PG_ANY); |
74dfd666 RW |
1095 | if (error) |
1096 | goto Free_second_object; | |
1097 | ||
1098 | forbidden_pages_map = bm1; | |
1099 | free_pages_map = bm2; | |
1100 | mark_nosave_pages(forbidden_pages_map); | |
1101 | ||
64ec72a1 | 1102 | pr_debug("Basic memory bitmaps created\n"); |
74dfd666 RW |
1103 | |
1104 | return 0; | |
1105 | ||
1106 | Free_second_object: | |
1107 | kfree(bm2); | |
1108 | Free_first_bitmap: | |
1109 | memory_bm_free(bm1, PG_UNSAFE_CLEAR); | |
1110 | Free_first_object: | |
1111 | kfree(bm1); | |
1112 | return -ENOMEM; | |
1113 | } | |
1114 | ||
1115 | /** | |
ef96f639 RW |
1116 | * free_basic_memory_bitmaps - Free memory bitmaps holding basic information. |
1117 | * | |
1118 | * Free memory bitmaps allocated by create_basic_memory_bitmaps(). The | |
1119 | * auxiliary pointers are necessary so that the bitmaps themselves are not | |
1120 | * referred to while they are being freed. | |
74dfd666 | 1121 | */ |
74dfd666 RW |
1122 | void free_basic_memory_bitmaps(void) |
1123 | { | |
1124 | struct memory_bitmap *bm1, *bm2; | |
1125 | ||
6a0c7cd3 RW |
1126 | if (WARN_ON(!(forbidden_pages_map && free_pages_map))) |
1127 | return; | |
74dfd666 RW |
1128 | |
1129 | bm1 = forbidden_pages_map; | |
1130 | bm2 = free_pages_map; | |
1131 | forbidden_pages_map = NULL; | |
1132 | free_pages_map = NULL; | |
1133 | memory_bm_free(bm1, PG_UNSAFE_CLEAR); | |
1134 | kfree(bm1); | |
1135 | memory_bm_free(bm2, PG_UNSAFE_CLEAR); | |
1136 | kfree(bm2); | |
1137 | ||
64ec72a1 | 1138 | pr_debug("Basic memory bitmaps freed\n"); |
74dfd666 RW |
1139 | } |
1140 | ||
1ad1410f AA |
1141 | void clear_free_pages(void) |
1142 | { | |
1143 | #ifdef CONFIG_PAGE_POISONING_ZERO | |
1144 | struct memory_bitmap *bm = free_pages_map; | |
1145 | unsigned long pfn; | |
1146 | ||
1147 | if (WARN_ON(!(free_pages_map))) | |
1148 | return; | |
1149 | ||
1150 | memory_bm_position_reset(bm); | |
1151 | pfn = memory_bm_next_pfn(bm); | |
1152 | while (pfn != BM_END_OF_MAP) { | |
1153 | if (pfn_valid(pfn)) | |
1154 | clear_highpage(pfn_to_page(pfn)); | |
1155 | ||
1156 | pfn = memory_bm_next_pfn(bm); | |
1157 | } | |
1158 | memory_bm_position_reset(bm); | |
64ec72a1 | 1159 | pr_info("free pages cleared after restore\n"); |
1ad1410f AA |
1160 | #endif /* PAGE_POISONING_ZERO */ |
1161 | } | |
1162 | ||
b788db79 | 1163 | /** |
ef96f639 RW |
1164 | * snapshot_additional_pages - Estimate the number of extra pages needed. |
1165 | * @zone: Memory zone to carry out the computation for. | |
1166 | * | |
1167 | * Estimate the number of additional pages needed for setting up a hibernation | |
1168 | * image data structures for @zone (usually, the returned value is greater than | |
1169 | * the exact number). | |
b788db79 | 1170 | */ |
b788db79 RW |
1171 | unsigned int snapshot_additional_pages(struct zone *zone) |
1172 | { | |
f469f02d | 1173 | unsigned int rtree, nodes; |
b788db79 | 1174 | |
f469f02d JR |
1175 | rtree = nodes = DIV_ROUND_UP(zone->spanned_pages, BM_BITS_PER_BLOCK); |
1176 | rtree += DIV_ROUND_UP(rtree * sizeof(struct rtree_node), | |
1177 | LINKED_PAGE_DATA_SIZE); | |
1178 | while (nodes > 1) { | |
1179 | nodes = DIV_ROUND_UP(nodes, BM_ENTRIES_PER_LEVEL); | |
1180 | rtree += nodes; | |
1181 | } | |
1182 | ||
9047eb62 | 1183 | return 2 * rtree; |
b788db79 RW |
1184 | } |
1185 | ||
8357376d RW |
1186 | #ifdef CONFIG_HIGHMEM |
1187 | /** | |
ef96f639 RW |
1188 | * count_free_highmem_pages - Compute the total number of free highmem pages. |
1189 | * | |
1190 | * The returned number is system-wide. | |
8357376d | 1191 | */ |
8357376d RW |
1192 | static unsigned int count_free_highmem_pages(void) |
1193 | { | |
1194 | struct zone *zone; | |
1195 | unsigned int cnt = 0; | |
1196 | ||
ee99c71c KM |
1197 | for_each_populated_zone(zone) |
1198 | if (is_highmem(zone)) | |
d23ad423 | 1199 | cnt += zone_page_state(zone, NR_FREE_PAGES); |
8357376d RW |
1200 | |
1201 | return cnt; | |
1202 | } | |
1203 | ||
1204 | /** | |
ef96f639 RW |
1205 | * saveable_highmem_page - Check if a highmem page is saveable. |
1206 | * | |
1207 | * Determine whether a highmem page should be included in a hibernation image. | |
8357376d | 1208 | * |
ef96f639 RW |
1209 | * We should save the page if it isn't Nosave or NosaveFree, or Reserved, |
1210 | * and it isn't part of a free chunk of pages. | |
8357376d | 1211 | */ |
846705de | 1212 | static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn) |
8357376d RW |
1213 | { |
1214 | struct page *page; | |
1215 | ||
1216 | if (!pfn_valid(pfn)) | |
1217 | return NULL; | |
1218 | ||
5b56db37 DH |
1219 | page = pfn_to_online_page(pfn); |
1220 | if (!page || page_zone(page) != zone) | |
846705de | 1221 | return NULL; |
8357376d RW |
1222 | |
1223 | BUG_ON(!PageHighMem(page)); | |
1224 | ||
abd02ac6 DH |
1225 | if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page)) |
1226 | return NULL; | |
1227 | ||
1228 | if (PageReserved(page) || PageOffline(page)) | |
8357376d RW |
1229 | return NULL; |
1230 | ||
c6968e73 SG |
1231 | if (page_is_guard(page)) |
1232 | return NULL; | |
1233 | ||
8357376d RW |
1234 | return page; |
1235 | } | |
1236 | ||
1237 | /** | |
ef96f639 | 1238 | * count_highmem_pages - Compute the total number of saveable highmem pages. |
8357376d | 1239 | */ |
fe419535 | 1240 | static unsigned int count_highmem_pages(void) |
8357376d RW |
1241 | { |
1242 | struct zone *zone; | |
1243 | unsigned int n = 0; | |
1244 | ||
98e73dc5 | 1245 | for_each_populated_zone(zone) { |
8357376d RW |
1246 | unsigned long pfn, max_zone_pfn; |
1247 | ||
1248 | if (!is_highmem(zone)) | |
1249 | continue; | |
1250 | ||
1251 | mark_free_pages(zone); | |
c33bc315 | 1252 | max_zone_pfn = zone_end_pfn(zone); |
8357376d | 1253 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
846705de | 1254 | if (saveable_highmem_page(zone, pfn)) |
8357376d RW |
1255 | n++; |
1256 | } | |
1257 | return n; | |
1258 | } | |
1259 | #else | |
846705de RW |
1260 | static inline void *saveable_highmem_page(struct zone *z, unsigned long p) |
1261 | { | |
1262 | return NULL; | |
1263 | } | |
8357376d RW |
1264 | #endif /* CONFIG_HIGHMEM */ |
1265 | ||
25761b6e | 1266 | /** |
ef96f639 RW |
1267 | * saveable_page - Check if the given page is saveable. |
1268 | * | |
1269 | * Determine whether a non-highmem page should be included in a hibernation | |
1270 | * image. | |
25761b6e | 1271 | * |
ef96f639 RW |
1272 | * We should save the page if it isn't Nosave, and is not in the range |
1273 | * of pages statically defined as 'unsaveable', and it isn't part of | |
1274 | * a free chunk of pages. | |
25761b6e | 1275 | */ |
846705de | 1276 | static struct page *saveable_page(struct zone *zone, unsigned long pfn) |
25761b6e | 1277 | { |
de491861 | 1278 | struct page *page; |
25761b6e RW |
1279 | |
1280 | if (!pfn_valid(pfn)) | |
ae83c5ee | 1281 | return NULL; |
25761b6e | 1282 | |
5b56db37 DH |
1283 | page = pfn_to_online_page(pfn); |
1284 | if (!page || page_zone(page) != zone) | |
846705de | 1285 | return NULL; |
ae83c5ee | 1286 | |
8357376d RW |
1287 | BUG_ON(PageHighMem(page)); |
1288 | ||
7be98234 | 1289 | if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page)) |
ae83c5ee | 1290 | return NULL; |
8357376d | 1291 | |
abd02ac6 DH |
1292 | if (PageOffline(page)) |
1293 | return NULL; | |
1294 | ||
8a235efa RW |
1295 | if (PageReserved(page) |
1296 | && (!kernel_page_present(page) || pfn_is_nosave(pfn))) | |
ae83c5ee | 1297 | return NULL; |
25761b6e | 1298 | |
c6968e73 SG |
1299 | if (page_is_guard(page)) |
1300 | return NULL; | |
1301 | ||
ae83c5ee | 1302 | return page; |
25761b6e RW |
1303 | } |
1304 | ||
8357376d | 1305 | /** |
ef96f639 | 1306 | * count_data_pages - Compute the total number of saveable non-highmem pages. |
8357376d | 1307 | */ |
fe419535 | 1308 | static unsigned int count_data_pages(void) |
25761b6e RW |
1309 | { |
1310 | struct zone *zone; | |
ae83c5ee | 1311 | unsigned long pfn, max_zone_pfn; |
dc19d507 | 1312 | unsigned int n = 0; |
25761b6e | 1313 | |
98e73dc5 | 1314 | for_each_populated_zone(zone) { |
25761b6e RW |
1315 | if (is_highmem(zone)) |
1316 | continue; | |
8357376d | 1317 | |
25761b6e | 1318 | mark_free_pages(zone); |
c33bc315 | 1319 | max_zone_pfn = zone_end_pfn(zone); |
ae83c5ee | 1320 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
846705de | 1321 | if (saveable_page(zone, pfn)) |
8357376d | 1322 | n++; |
25761b6e | 1323 | } |
a0f49651 | 1324 | return n; |
25761b6e RW |
1325 | } |
1326 | ||
ef96f639 RW |
1327 | /* |
1328 | * This is needed, because copy_page and memcpy are not usable for copying | |
8357376d RW |
1329 | * task structs. |
1330 | */ | |
1331 | static inline void do_copy_page(long *dst, long *src) | |
f623f0db RW |
1332 | { |
1333 | int n; | |
1334 | ||
f623f0db RW |
1335 | for (n = PAGE_SIZE / sizeof(long); n; n--) |
1336 | *dst++ = *src++; | |
1337 | } | |
1338 | ||
8a235efa | 1339 | /** |
ef96f639 RW |
1340 | * safe_copy_page - Copy a page in a safe way. |
1341 | * | |
1342 | * Check if the page we are going to copy is marked as present in the kernel | |
d6332692 RE |
1343 | * page tables. This always is the case if CONFIG_DEBUG_PAGEALLOC or |
1344 | * CONFIG_ARCH_HAS_SET_DIRECT_MAP is not set. In that case kernel_page_present() | |
1345 | * always returns 'true'. | |
8a235efa RW |
1346 | */ |
1347 | static void safe_copy_page(void *dst, struct page *s_page) | |
1348 | { | |
1349 | if (kernel_page_present(s_page)) { | |
1350 | do_copy_page(dst, page_address(s_page)); | |
1351 | } else { | |
1352 | kernel_map_pages(s_page, 1, 1); | |
1353 | do_copy_page(dst, page_address(s_page)); | |
1354 | kernel_map_pages(s_page, 1, 0); | |
1355 | } | |
1356 | } | |
1357 | ||
8357376d | 1358 | #ifdef CONFIG_HIGHMEM |
efd5a852 | 1359 | static inline struct page *page_is_saveable(struct zone *zone, unsigned long pfn) |
8357376d RW |
1360 | { |
1361 | return is_highmem(zone) ? | |
846705de | 1362 | saveable_highmem_page(zone, pfn) : saveable_page(zone, pfn); |
8357376d RW |
1363 | } |
1364 | ||
8a235efa | 1365 | static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn) |
8357376d RW |
1366 | { |
1367 | struct page *s_page, *d_page; | |
1368 | void *src, *dst; | |
1369 | ||
1370 | s_page = pfn_to_page(src_pfn); | |
1371 | d_page = pfn_to_page(dst_pfn); | |
1372 | if (PageHighMem(s_page)) { | |
0de9a1e2 CW |
1373 | src = kmap_atomic(s_page); |
1374 | dst = kmap_atomic(d_page); | |
8357376d | 1375 | do_copy_page(dst, src); |
0de9a1e2 CW |
1376 | kunmap_atomic(dst); |
1377 | kunmap_atomic(src); | |
8357376d | 1378 | } else { |
8357376d | 1379 | if (PageHighMem(d_page)) { |
ef96f639 RW |
1380 | /* |
1381 | * The page pointed to by src may contain some kernel | |
8357376d RW |
1382 | * data modified by kmap_atomic() |
1383 | */ | |
8a235efa | 1384 | safe_copy_page(buffer, s_page); |
0de9a1e2 | 1385 | dst = kmap_atomic(d_page); |
3ecb01df | 1386 | copy_page(dst, buffer); |
0de9a1e2 | 1387 | kunmap_atomic(dst); |
8357376d | 1388 | } else { |
8a235efa | 1389 | safe_copy_page(page_address(d_page), s_page); |
8357376d RW |
1390 | } |
1391 | } | |
1392 | } | |
1393 | #else | |
846705de | 1394 | #define page_is_saveable(zone, pfn) saveable_page(zone, pfn) |
8357376d | 1395 | |
8a235efa | 1396 | static inline void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn) |
8357376d | 1397 | { |
8a235efa RW |
1398 | safe_copy_page(page_address(pfn_to_page(dst_pfn)), |
1399 | pfn_to_page(src_pfn)); | |
8357376d RW |
1400 | } |
1401 | #endif /* CONFIG_HIGHMEM */ | |
1402 | ||
efd5a852 RW |
1403 | static void copy_data_pages(struct memory_bitmap *copy_bm, |
1404 | struct memory_bitmap *orig_bm) | |
25761b6e RW |
1405 | { |
1406 | struct zone *zone; | |
b788db79 | 1407 | unsigned long pfn; |
25761b6e | 1408 | |
98e73dc5 | 1409 | for_each_populated_zone(zone) { |
b788db79 RW |
1410 | unsigned long max_zone_pfn; |
1411 | ||
25761b6e | 1412 | mark_free_pages(zone); |
c33bc315 | 1413 | max_zone_pfn = zone_end_pfn(zone); |
b788db79 | 1414 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
8357376d | 1415 | if (page_is_saveable(zone, pfn)) |
b788db79 | 1416 | memory_bm_set_bit(orig_bm, pfn); |
25761b6e | 1417 | } |
b788db79 RW |
1418 | memory_bm_position_reset(orig_bm); |
1419 | memory_bm_position_reset(copy_bm); | |
df7c4872 | 1420 | for(;;) { |
b788db79 | 1421 | pfn = memory_bm_next_pfn(orig_bm); |
df7c4872 FW |
1422 | if (unlikely(pfn == BM_END_OF_MAP)) |
1423 | break; | |
1424 | copy_data_page(memory_bm_next_pfn(copy_bm), pfn); | |
1425 | } | |
25761b6e RW |
1426 | } |
1427 | ||
8357376d RW |
1428 | /* Total number of image pages */ |
1429 | static unsigned int nr_copy_pages; | |
1430 | /* Number of pages needed for saving the original pfns of the image pages */ | |
1431 | static unsigned int nr_meta_pages; | |
64a473cb RW |
1432 | /* |
1433 | * Numbers of normal and highmem page frames allocated for hibernation image | |
1434 | * before suspending devices. | |
1435 | */ | |
0bae5fd3 | 1436 | static unsigned int alloc_normal, alloc_highmem; |
64a473cb RW |
1437 | /* |
1438 | * Memory bitmap used for marking saveable pages (during hibernation) or | |
1439 | * hibernation image pages (during restore) | |
1440 | */ | |
1441 | static struct memory_bitmap orig_bm; | |
1442 | /* | |
1443 | * Memory bitmap used during hibernation for marking allocated page frames that | |
1444 | * will contain copies of saveable pages. During restore it is initially used | |
1445 | * for marking hibernation image pages, but then the set bits from it are | |
1446 | * duplicated in @orig_bm and it is released. On highmem systems it is next | |
1447 | * used for marking "safe" highmem pages, but it has to be reinitialized for | |
1448 | * this purpose. | |
1449 | */ | |
1450 | static struct memory_bitmap copy_bm; | |
8357376d | 1451 | |
25761b6e | 1452 | /** |
ef96f639 | 1453 | * swsusp_free - Free pages allocated for hibernation image. |
cd560bb2 | 1454 | * |
ef96f639 RW |
1455 | * Image pages are alocated before snapshot creation, so they need to be |
1456 | * released after resume. | |
25761b6e | 1457 | */ |
25761b6e RW |
1458 | void swsusp_free(void) |
1459 | { | |
fdd64ed5 | 1460 | unsigned long fb_pfn, fr_pfn; |
6efde38f | 1461 | |
fdd64ed5 JR |
1462 | if (!forbidden_pages_map || !free_pages_map) |
1463 | goto out; | |
1464 | ||
1465 | memory_bm_position_reset(forbidden_pages_map); | |
1466 | memory_bm_position_reset(free_pages_map); | |
1467 | ||
1468 | loop: | |
1469 | fr_pfn = memory_bm_next_pfn(free_pages_map); | |
1470 | fb_pfn = memory_bm_next_pfn(forbidden_pages_map); | |
1471 | ||
1472 | /* | |
1473 | * Find the next bit set in both bitmaps. This is guaranteed to | |
1474 | * terminate when fb_pfn == fr_pfn == BM_END_OF_MAP. | |
1475 | */ | |
1476 | do { | |
1477 | if (fb_pfn < fr_pfn) | |
1478 | fb_pfn = memory_bm_next_pfn(forbidden_pages_map); | |
1479 | if (fr_pfn < fb_pfn) | |
1480 | fr_pfn = memory_bm_next_pfn(free_pages_map); | |
1481 | } while (fb_pfn != fr_pfn); | |
1482 | ||
1483 | if (fr_pfn != BM_END_OF_MAP && pfn_valid(fr_pfn)) { | |
1484 | struct page *page = pfn_to_page(fr_pfn); | |
1485 | ||
1486 | memory_bm_clear_current(forbidden_pages_map); | |
1487 | memory_bm_clear_current(free_pages_map); | |
4c0b6c10 | 1488 | hibernate_restore_unprotect_page(page_address(page)); |
fdd64ed5 JR |
1489 | __free_page(page); |
1490 | goto loop; | |
25761b6e | 1491 | } |
fdd64ed5 JR |
1492 | |
1493 | out: | |
f577eb30 RW |
1494 | nr_copy_pages = 0; |
1495 | nr_meta_pages = 0; | |
75534b50 | 1496 | restore_pblist = NULL; |
6e1819d6 | 1497 | buffer = NULL; |
64a473cb RW |
1498 | alloc_normal = 0; |
1499 | alloc_highmem = 0; | |
4c0b6c10 | 1500 | hibernate_restore_protection_end(); |
25761b6e RW |
1501 | } |
1502 | ||
4bb33435 RW |
1503 | /* Helper functions used for the shrinking of memory. */ |
1504 | ||
1505 | #define GFP_IMAGE (GFP_KERNEL | __GFP_NOWARN) | |
1506 | ||
fe419535 | 1507 | /** |
ef96f639 | 1508 | * preallocate_image_pages - Allocate a number of pages for hibernation image. |
4bb33435 RW |
1509 | * @nr_pages: Number of page frames to allocate. |
1510 | * @mask: GFP flags to use for the allocation. | |
fe419535 | 1511 | * |
4bb33435 RW |
1512 | * Return value: Number of page frames actually allocated |
1513 | */ | |
1514 | static unsigned long preallocate_image_pages(unsigned long nr_pages, gfp_t mask) | |
1515 | { | |
1516 | unsigned long nr_alloc = 0; | |
1517 | ||
1518 | while (nr_pages > 0) { | |
64a473cb RW |
1519 | struct page *page; |
1520 | ||
1521 | page = alloc_image_page(mask); | |
1522 | if (!page) | |
4bb33435 | 1523 | break; |
64a473cb RW |
1524 | memory_bm_set_bit(©_bm, page_to_pfn(page)); |
1525 | if (PageHighMem(page)) | |
1526 | alloc_highmem++; | |
1527 | else | |
1528 | alloc_normal++; | |
4bb33435 RW |
1529 | nr_pages--; |
1530 | nr_alloc++; | |
1531 | } | |
1532 | ||
1533 | return nr_alloc; | |
1534 | } | |
1535 | ||
6715045d RW |
1536 | static unsigned long preallocate_image_memory(unsigned long nr_pages, |
1537 | unsigned long avail_normal) | |
4bb33435 | 1538 | { |
6715045d RW |
1539 | unsigned long alloc; |
1540 | ||
1541 | if (avail_normal <= alloc_normal) | |
1542 | return 0; | |
1543 | ||
1544 | alloc = avail_normal - alloc_normal; | |
1545 | if (nr_pages < alloc) | |
1546 | alloc = nr_pages; | |
1547 | ||
1548 | return preallocate_image_pages(alloc, GFP_IMAGE); | |
4bb33435 RW |
1549 | } |
1550 | ||
1551 | #ifdef CONFIG_HIGHMEM | |
1552 | static unsigned long preallocate_image_highmem(unsigned long nr_pages) | |
1553 | { | |
1554 | return preallocate_image_pages(nr_pages, GFP_IMAGE | __GFP_HIGHMEM); | |
1555 | } | |
1556 | ||
1557 | /** | |
ef96f639 | 1558 | * __fraction - Compute (an approximation of) x * (multiplier / base). |
fe419535 | 1559 | */ |
4bb33435 RW |
1560 | static unsigned long __fraction(u64 x, u64 multiplier, u64 base) |
1561 | { | |
1562 | x *= multiplier; | |
1563 | do_div(x, base); | |
1564 | return (unsigned long)x; | |
1565 | } | |
fe419535 | 1566 | |
4bb33435 | 1567 | static unsigned long preallocate_highmem_fraction(unsigned long nr_pages, |
efd5a852 RW |
1568 | unsigned long highmem, |
1569 | unsigned long total) | |
fe419535 | 1570 | { |
4bb33435 RW |
1571 | unsigned long alloc = __fraction(nr_pages, highmem, total); |
1572 | ||
1573 | return preallocate_image_pages(alloc, GFP_IMAGE | __GFP_HIGHMEM); | |
fe419535 | 1574 | } |
4bb33435 RW |
1575 | #else /* CONFIG_HIGHMEM */ |
1576 | static inline unsigned long preallocate_image_highmem(unsigned long nr_pages) | |
1577 | { | |
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | static inline unsigned long preallocate_highmem_fraction(unsigned long nr_pages, | |
efd5a852 RW |
1582 | unsigned long highmem, |
1583 | unsigned long total) | |
4bb33435 RW |
1584 | { |
1585 | return 0; | |
1586 | } | |
1587 | #endif /* CONFIG_HIGHMEM */ | |
fe419535 | 1588 | |
4bb33435 | 1589 | /** |
ef96f639 | 1590 | * free_unnecessary_pages - Release preallocated pages not needed for the image. |
64a473cb | 1591 | */ |
a64fc82c | 1592 | static unsigned long free_unnecessary_pages(void) |
64a473cb | 1593 | { |
a64fc82c | 1594 | unsigned long save, to_free_normal, to_free_highmem, free; |
64a473cb | 1595 | |
6715045d RW |
1596 | save = count_data_pages(); |
1597 | if (alloc_normal >= save) { | |
1598 | to_free_normal = alloc_normal - save; | |
1599 | save = 0; | |
1600 | } else { | |
1601 | to_free_normal = 0; | |
1602 | save -= alloc_normal; | |
1603 | } | |
1604 | save += count_highmem_pages(); | |
1605 | if (alloc_highmem >= save) { | |
1606 | to_free_highmem = alloc_highmem - save; | |
64a473cb RW |
1607 | } else { |
1608 | to_free_highmem = 0; | |
4d4cf23c RW |
1609 | save -= alloc_highmem; |
1610 | if (to_free_normal > save) | |
1611 | to_free_normal -= save; | |
1612 | else | |
1613 | to_free_normal = 0; | |
64a473cb | 1614 | } |
a64fc82c | 1615 | free = to_free_normal + to_free_highmem; |
64a473cb RW |
1616 | |
1617 | memory_bm_position_reset(©_bm); | |
1618 | ||
a9c9b442 | 1619 | while (to_free_normal > 0 || to_free_highmem > 0) { |
64a473cb RW |
1620 | unsigned long pfn = memory_bm_next_pfn(©_bm); |
1621 | struct page *page = pfn_to_page(pfn); | |
1622 | ||
1623 | if (PageHighMem(page)) { | |
1624 | if (!to_free_highmem) | |
1625 | continue; | |
1626 | to_free_highmem--; | |
1627 | alloc_highmem--; | |
1628 | } else { | |
1629 | if (!to_free_normal) | |
1630 | continue; | |
1631 | to_free_normal--; | |
1632 | alloc_normal--; | |
1633 | } | |
1634 | memory_bm_clear_bit(©_bm, pfn); | |
1635 | swsusp_unset_page_forbidden(page); | |
1636 | swsusp_unset_page_free(page); | |
1637 | __free_page(page); | |
1638 | } | |
a64fc82c WK |
1639 | |
1640 | return free; | |
64a473cb RW |
1641 | } |
1642 | ||
ef4aede3 | 1643 | /** |
ef96f639 | 1644 | * minimum_image_size - Estimate the minimum acceptable size of an image. |
ef4aede3 RW |
1645 | * @saveable: Number of saveable pages in the system. |
1646 | * | |
1647 | * We want to avoid attempting to free too much memory too hard, so estimate the | |
1648 | * minimum acceptable size of a hibernation image to use as the lower limit for | |
1649 | * preallocating memory. | |
1650 | * | |
1651 | * We assume that the minimum image size should be proportional to | |
1652 | * | |
1653 | * [number of saveable pages] - [number of pages that can be freed in theory] | |
1654 | * | |
1655 | * where the second term is the sum of (1) reclaimable slab pages, (2) active | |
bdbc98ab | 1656 | * and (3) inactive anonymous pages, (4) active and (5) inactive file pages. |
ef4aede3 RW |
1657 | */ |
1658 | static unsigned long minimum_image_size(unsigned long saveable) | |
1659 | { | |
1660 | unsigned long size; | |
1661 | ||
d507e2eb | 1662 | size = global_node_page_state(NR_SLAB_RECLAIMABLE) |
599d0c95 MG |
1663 | + global_node_page_state(NR_ACTIVE_ANON) |
1664 | + global_node_page_state(NR_INACTIVE_ANON) | |
1665 | + global_node_page_state(NR_ACTIVE_FILE) | |
bdbc98ab | 1666 | + global_node_page_state(NR_INACTIVE_FILE); |
ef4aede3 RW |
1667 | |
1668 | return saveable <= size ? 0 : saveable - size; | |
1669 | } | |
1670 | ||
64a473cb | 1671 | /** |
ef96f639 | 1672 | * hibernate_preallocate_memory - Preallocate memory for hibernation image. |
4bb33435 RW |
1673 | * |
1674 | * To create a hibernation image it is necessary to make a copy of every page | |
1675 | * frame in use. We also need a number of page frames to be free during | |
1676 | * hibernation for allocations made while saving the image and for device | |
1677 | * drivers, in case they need to allocate memory from their hibernation | |
ddeb6487 RW |
1678 | * callbacks (these two numbers are given by PAGES_FOR_IO (which is a rough |
1679 | * estimate) and reserverd_size divided by PAGE_SIZE (which is tunable through | |
1680 | * /sys/power/reserved_size, respectively). To make this happen, we compute the | |
1681 | * total number of available page frames and allocate at least | |
4bb33435 | 1682 | * |
ddeb6487 RW |
1683 | * ([page frames total] + PAGES_FOR_IO + [metadata pages]) / 2 |
1684 | * + 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE) | |
4bb33435 RW |
1685 | * |
1686 | * of them, which corresponds to the maximum size of a hibernation image. | |
1687 | * | |
1688 | * If image_size is set below the number following from the above formula, | |
1689 | * the preallocation of memory is continued until the total number of saveable | |
ef4aede3 RW |
1690 | * pages in the system is below the requested image size or the minimum |
1691 | * acceptable image size returned by minimum_image_size(), whichever is greater. | |
4bb33435 | 1692 | */ |
64a473cb | 1693 | int hibernate_preallocate_memory(void) |
fe419535 | 1694 | { |
fe419535 | 1695 | struct zone *zone; |
4bb33435 | 1696 | unsigned long saveable, size, max_size, count, highmem, pages = 0; |
6715045d | 1697 | unsigned long alloc, save_highmem, pages_highmem, avail_normal; |
db597605 | 1698 | ktime_t start, stop; |
64a473cb | 1699 | int error; |
fe419535 | 1700 | |
64ec72a1 | 1701 | pr_info("Preallocating image memory... "); |
db597605 | 1702 | start = ktime_get(); |
fe419535 | 1703 | |
64a473cb RW |
1704 | error = memory_bm_create(&orig_bm, GFP_IMAGE, PG_ANY); |
1705 | if (error) | |
1706 | goto err_out; | |
1707 | ||
1708 | error = memory_bm_create(©_bm, GFP_IMAGE, PG_ANY); | |
1709 | if (error) | |
1710 | goto err_out; | |
1711 | ||
1712 | alloc_normal = 0; | |
1713 | alloc_highmem = 0; | |
1714 | ||
4bb33435 | 1715 | /* Count the number of saveable data pages. */ |
64a473cb | 1716 | save_highmem = count_highmem_pages(); |
4bb33435 | 1717 | saveable = count_data_pages(); |
fe419535 | 1718 | |
4bb33435 RW |
1719 | /* |
1720 | * Compute the total number of page frames we can use (count) and the | |
1721 | * number of pages needed for image metadata (size). | |
1722 | */ | |
1723 | count = saveable; | |
64a473cb RW |
1724 | saveable += save_highmem; |
1725 | highmem = save_highmem; | |
4bb33435 RW |
1726 | size = 0; |
1727 | for_each_populated_zone(zone) { | |
1728 | size += snapshot_additional_pages(zone); | |
1729 | if (is_highmem(zone)) | |
1730 | highmem += zone_page_state(zone, NR_FREE_PAGES); | |
1731 | else | |
1732 | count += zone_page_state(zone, NR_FREE_PAGES); | |
1733 | } | |
6715045d | 1734 | avail_normal = count; |
4bb33435 RW |
1735 | count += highmem; |
1736 | count -= totalreserve_pages; | |
1737 | ||
85055dd8 MS |
1738 | /* Add number of pages required for page keys (s390 only). */ |
1739 | size += page_key_additional_pages(saveable); | |
1740 | ||
4bb33435 | 1741 | /* Compute the maximum number of saveable pages to leave in memory. */ |
ddeb6487 RW |
1742 | max_size = (count - (size + PAGES_FOR_IO)) / 2 |
1743 | - 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE); | |
266f1a25 | 1744 | /* Compute the desired number of image pages specified by image_size. */ |
4bb33435 RW |
1745 | size = DIV_ROUND_UP(image_size, PAGE_SIZE); |
1746 | if (size > max_size) | |
1747 | size = max_size; | |
1748 | /* | |
266f1a25 RW |
1749 | * If the desired number of image pages is at least as large as the |
1750 | * current number of saveable pages in memory, allocate page frames for | |
1751 | * the image and we're done. | |
4bb33435 | 1752 | */ |
64a473cb RW |
1753 | if (size >= saveable) { |
1754 | pages = preallocate_image_highmem(save_highmem); | |
6715045d | 1755 | pages += preallocate_image_memory(saveable - pages, avail_normal); |
4bb33435 | 1756 | goto out; |
64a473cb | 1757 | } |
4bb33435 | 1758 | |
ef4aede3 RW |
1759 | /* Estimate the minimum size of the image. */ |
1760 | pages = minimum_image_size(saveable); | |
6715045d RW |
1761 | /* |
1762 | * To avoid excessive pressure on the normal zone, leave room in it to | |
1763 | * accommodate an image of the minimum size (unless it's already too | |
1764 | * small, in which case don't preallocate pages from it at all). | |
1765 | */ | |
1766 | if (avail_normal > pages) | |
1767 | avail_normal -= pages; | |
1768 | else | |
1769 | avail_normal = 0; | |
ef4aede3 RW |
1770 | if (size < pages) |
1771 | size = min_t(unsigned long, pages, max_size); | |
1772 | ||
4bb33435 RW |
1773 | /* |
1774 | * Let the memory management subsystem know that we're going to need a | |
1775 | * large number of page frames to allocate and make it free some memory. | |
1776 | * NOTE: If this is not done, performance will be hurt badly in some | |
1777 | * test cases. | |
1778 | */ | |
1779 | shrink_all_memory(saveable - size); | |
1780 | ||
1781 | /* | |
1782 | * The number of saveable pages in memory was too high, so apply some | |
1783 | * pressure to decrease it. First, make room for the largest possible | |
1784 | * image and fail if that doesn't work. Next, try to decrease the size | |
ef4aede3 RW |
1785 | * of the image as much as indicated by 'size' using allocations from |
1786 | * highmem and non-highmem zones separately. | |
4bb33435 RW |
1787 | */ |
1788 | pages_highmem = preallocate_image_highmem(highmem / 2); | |
fd432b9f AL |
1789 | alloc = count - max_size; |
1790 | if (alloc > pages_highmem) | |
1791 | alloc -= pages_highmem; | |
1792 | else | |
1793 | alloc = 0; | |
6715045d RW |
1794 | pages = preallocate_image_memory(alloc, avail_normal); |
1795 | if (pages < alloc) { | |
1796 | /* We have exhausted non-highmem pages, try highmem. */ | |
1797 | alloc -= pages; | |
1798 | pages += pages_highmem; | |
1799 | pages_highmem = preallocate_image_highmem(alloc); | |
1800 | if (pages_highmem < alloc) | |
1801 | goto err_out; | |
1802 | pages += pages_highmem; | |
1803 | /* | |
1804 | * size is the desired number of saveable pages to leave in | |
1805 | * memory, so try to preallocate (all memory - size) pages. | |
1806 | */ | |
1807 | alloc = (count - pages) - size; | |
1808 | pages += preallocate_image_highmem(alloc); | |
1809 | } else { | |
1810 | /* | |
1811 | * There are approximately max_size saveable pages at this point | |
1812 | * and we want to reduce this number down to size. | |
1813 | */ | |
1814 | alloc = max_size - size; | |
1815 | size = preallocate_highmem_fraction(alloc, highmem, count); | |
1816 | pages_highmem += size; | |
1817 | alloc -= size; | |
1818 | size = preallocate_image_memory(alloc, avail_normal); | |
1819 | pages_highmem += preallocate_image_highmem(alloc - size); | |
1820 | pages += pages_highmem + size; | |
1821 | } | |
4bb33435 | 1822 | |
64a473cb RW |
1823 | /* |
1824 | * We only need as many page frames for the image as there are saveable | |
1825 | * pages in memory, but we have allocated more. Release the excessive | |
1826 | * ones now. | |
1827 | */ | |
a64fc82c | 1828 | pages -= free_unnecessary_pages(); |
4bb33435 RW |
1829 | |
1830 | out: | |
db597605 | 1831 | stop = ktime_get(); |
64ec72a1 | 1832 | pr_cont("done (allocated %lu pages)\n", pages); |
db597605 | 1833 | swsusp_show_speed(start, stop, pages, "Allocated"); |
fe419535 RW |
1834 | |
1835 | return 0; | |
64a473cb RW |
1836 | |
1837 | err_out: | |
64ec72a1 | 1838 | pr_cont("\n"); |
64a473cb RW |
1839 | swsusp_free(); |
1840 | return -ENOMEM; | |
fe419535 RW |
1841 | } |
1842 | ||
8357376d RW |
1843 | #ifdef CONFIG_HIGHMEM |
1844 | /** | |
ef96f639 RW |
1845 | * count_pages_for_highmem - Count non-highmem pages needed for copying highmem. |
1846 | * | |
1847 | * Compute the number of non-highmem pages that will be necessary for creating | |
1848 | * copies of highmem pages. | |
1849 | */ | |
8357376d RW |
1850 | static unsigned int count_pages_for_highmem(unsigned int nr_highmem) |
1851 | { | |
64a473cb | 1852 | unsigned int free_highmem = count_free_highmem_pages() + alloc_highmem; |
8357376d RW |
1853 | |
1854 | if (free_highmem >= nr_highmem) | |
1855 | nr_highmem = 0; | |
1856 | else | |
1857 | nr_highmem -= free_highmem; | |
1858 | ||
1859 | return nr_highmem; | |
1860 | } | |
1861 | #else | |
efd5a852 | 1862 | static unsigned int count_pages_for_highmem(unsigned int nr_highmem) { return 0; } |
8357376d | 1863 | #endif /* CONFIG_HIGHMEM */ |
25761b6e RW |
1864 | |
1865 | /** | |
ef96f639 | 1866 | * enough_free_mem - Check if there is enough free memory for the image. |
25761b6e | 1867 | */ |
8357376d | 1868 | static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem) |
25761b6e | 1869 | { |
e5e2fa78 | 1870 | struct zone *zone; |
64a473cb | 1871 | unsigned int free = alloc_normal; |
e5e2fa78 | 1872 | |
98e73dc5 | 1873 | for_each_populated_zone(zone) |
8357376d | 1874 | if (!is_highmem(zone)) |
d23ad423 | 1875 | free += zone_page_state(zone, NR_FREE_PAGES); |
940864dd | 1876 | |
8357376d | 1877 | nr_pages += count_pages_for_highmem(nr_highmem); |
64ec72a1 JP |
1878 | pr_debug("Normal pages needed: %u + %u, available pages: %u\n", |
1879 | nr_pages, PAGES_FOR_IO, free); | |
940864dd | 1880 | |
64a473cb | 1881 | return free > nr_pages + PAGES_FOR_IO; |
25761b6e RW |
1882 | } |
1883 | ||
8357376d RW |
1884 | #ifdef CONFIG_HIGHMEM |
1885 | /** | |
ef96f639 RW |
1886 | * get_highmem_buffer - Allocate a buffer for highmem pages. |
1887 | * | |
1888 | * If there are some highmem pages in the hibernation image, we may need a | |
1889 | * buffer to copy them and/or load their data. | |
8357376d | 1890 | */ |
8357376d RW |
1891 | static inline int get_highmem_buffer(int safe_needed) |
1892 | { | |
453f85d4 | 1893 | buffer = get_image_page(GFP_ATOMIC, safe_needed); |
8357376d RW |
1894 | return buffer ? 0 : -ENOMEM; |
1895 | } | |
1896 | ||
1897 | /** | |
ef96f639 RW |
1898 | * alloc_highmem_image_pages - Allocate some highmem pages for the image. |
1899 | * | |
1900 | * Try to allocate as many pages as needed, but if the number of free highmem | |
1901 | * pages is less than that, allocate them all. | |
8357376d | 1902 | */ |
efd5a852 RW |
1903 | static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm, |
1904 | unsigned int nr_highmem) | |
8357376d RW |
1905 | { |
1906 | unsigned int to_alloc = count_free_highmem_pages(); | |
1907 | ||
1908 | if (to_alloc > nr_highmem) | |
1909 | to_alloc = nr_highmem; | |
1910 | ||
1911 | nr_highmem -= to_alloc; | |
1912 | while (to_alloc-- > 0) { | |
1913 | struct page *page; | |
1914 | ||
d0164adc | 1915 | page = alloc_image_page(__GFP_HIGHMEM|__GFP_KSWAPD_RECLAIM); |
8357376d RW |
1916 | memory_bm_set_bit(bm, page_to_pfn(page)); |
1917 | } | |
1918 | return nr_highmem; | |
1919 | } | |
1920 | #else | |
1921 | static inline int get_highmem_buffer(int safe_needed) { return 0; } | |
1922 | ||
efd5a852 RW |
1923 | static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm, |
1924 | unsigned int n) { return 0; } | |
8357376d RW |
1925 | #endif /* CONFIG_HIGHMEM */ |
1926 | ||
1927 | /** | |
ef96f639 | 1928 | * swsusp_alloc - Allocate memory for hibernation image. |
8357376d | 1929 | * |
ef96f639 RW |
1930 | * We first try to allocate as many highmem pages as there are |
1931 | * saveable highmem pages in the system. If that fails, we allocate | |
1932 | * non-highmem pages for the copies of the remaining highmem ones. | |
8357376d | 1933 | * |
ef96f639 RW |
1934 | * In this approach it is likely that the copies of highmem pages will |
1935 | * also be located in the high memory, because of the way in which | |
1936 | * copy_data_pages() works. | |
8357376d | 1937 | */ |
eba74c29 | 1938 | static int swsusp_alloc(struct memory_bitmap *copy_bm, |
efd5a852 | 1939 | unsigned int nr_pages, unsigned int nr_highmem) |
054bd4c1 | 1940 | { |
8357376d | 1941 | if (nr_highmem > 0) { |
2e725a06 | 1942 | if (get_highmem_buffer(PG_ANY)) |
64a473cb RW |
1943 | goto err_out; |
1944 | if (nr_highmem > alloc_highmem) { | |
1945 | nr_highmem -= alloc_highmem; | |
1946 | nr_pages += alloc_highmem_pages(copy_bm, nr_highmem); | |
1947 | } | |
8357376d | 1948 | } |
64a473cb RW |
1949 | if (nr_pages > alloc_normal) { |
1950 | nr_pages -= alloc_normal; | |
1951 | while (nr_pages-- > 0) { | |
1952 | struct page *page; | |
1953 | ||
453f85d4 | 1954 | page = alloc_image_page(GFP_ATOMIC); |
64a473cb RW |
1955 | if (!page) |
1956 | goto err_out; | |
1957 | memory_bm_set_bit(copy_bm, page_to_pfn(page)); | |
1958 | } | |
25761b6e | 1959 | } |
64a473cb | 1960 | |
b788db79 | 1961 | return 0; |
25761b6e | 1962 | |
64a473cb | 1963 | err_out: |
b788db79 | 1964 | swsusp_free(); |
2e725a06 | 1965 | return -ENOMEM; |
25761b6e RW |
1966 | } |
1967 | ||
722a9f92 | 1968 | asmlinkage __visible int swsusp_save(void) |
25761b6e | 1969 | { |
8357376d | 1970 | unsigned int nr_pages, nr_highmem; |
25761b6e | 1971 | |
64ec72a1 | 1972 | pr_info("Creating hibernation image:\n"); |
25761b6e | 1973 | |
9f8f2172 | 1974 | drain_local_pages(NULL); |
a0f49651 | 1975 | nr_pages = count_data_pages(); |
8357376d | 1976 | nr_highmem = count_highmem_pages(); |
64ec72a1 | 1977 | pr_info("Need to copy %u pages\n", nr_pages + nr_highmem); |
25761b6e | 1978 | |
8357376d | 1979 | if (!enough_free_mem(nr_pages, nr_highmem)) { |
64ec72a1 | 1980 | pr_err("Not enough free memory\n"); |
25761b6e RW |
1981 | return -ENOMEM; |
1982 | } | |
1983 | ||
eba74c29 | 1984 | if (swsusp_alloc(©_bm, nr_pages, nr_highmem)) { |
64ec72a1 | 1985 | pr_err("Memory allocation failed\n"); |
a0f49651 | 1986 | return -ENOMEM; |
8357376d | 1987 | } |
25761b6e | 1988 | |
ef96f639 RW |
1989 | /* |
1990 | * During allocating of suspend pagedir, new cold pages may appear. | |
25761b6e RW |
1991 | * Kill them. |
1992 | */ | |
9f8f2172 | 1993 | drain_local_pages(NULL); |
b788db79 | 1994 | copy_data_pages(©_bm, &orig_bm); |
25761b6e RW |
1995 | |
1996 | /* | |
1997 | * End of critical section. From now on, we can write to memory, | |
1998 | * but we should not touch disk. This specially means we must _not_ | |
1999 | * touch swap space! Except we must write out our image of course. | |
2000 | */ | |
2001 | ||
8357376d | 2002 | nr_pages += nr_highmem; |
a0f49651 | 2003 | nr_copy_pages = nr_pages; |
8357376d | 2004 | nr_meta_pages = DIV_ROUND_UP(nr_pages * sizeof(long), PAGE_SIZE); |
a0f49651 | 2005 | |
64ec72a1 | 2006 | pr_info("Hibernation image created (%d pages copied)\n", nr_pages); |
8357376d | 2007 | |
25761b6e RW |
2008 | return 0; |
2009 | } | |
f577eb30 | 2010 | |
d307c4a8 RW |
2011 | #ifndef CONFIG_ARCH_HIBERNATION_HEADER |
2012 | static int init_header_complete(struct swsusp_info *info) | |
f577eb30 | 2013 | { |
d307c4a8 | 2014 | memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname)); |
f577eb30 | 2015 | info->version_code = LINUX_VERSION_CODE; |
d307c4a8 RW |
2016 | return 0; |
2017 | } | |
2018 | ||
2019 | static char *check_image_kernel(struct swsusp_info *info) | |
2020 | { | |
2021 | if (info->version_code != LINUX_VERSION_CODE) | |
2022 | return "kernel version"; | |
2023 | if (strcmp(info->uts.sysname,init_utsname()->sysname)) | |
2024 | return "system type"; | |
2025 | if (strcmp(info->uts.release,init_utsname()->release)) | |
2026 | return "kernel release"; | |
2027 | if (strcmp(info->uts.version,init_utsname()->version)) | |
2028 | return "version"; | |
2029 | if (strcmp(info->uts.machine,init_utsname()->machine)) | |
2030 | return "machine"; | |
2031 | return NULL; | |
2032 | } | |
2033 | #endif /* CONFIG_ARCH_HIBERNATION_HEADER */ | |
2034 | ||
af508b34 RW |
2035 | unsigned long snapshot_get_image_size(void) |
2036 | { | |
2037 | return nr_copy_pages + nr_meta_pages + 1; | |
2038 | } | |
2039 | ||
d307c4a8 RW |
2040 | static int init_header(struct swsusp_info *info) |
2041 | { | |
2042 | memset(info, 0, sizeof(struct swsusp_info)); | |
0ed5fd13 | 2043 | info->num_physpages = get_num_physpages(); |
f577eb30 | 2044 | info->image_pages = nr_copy_pages; |
af508b34 | 2045 | info->pages = snapshot_get_image_size(); |
6e1819d6 RW |
2046 | info->size = info->pages; |
2047 | info->size <<= PAGE_SHIFT; | |
d307c4a8 | 2048 | return init_header_complete(info); |
f577eb30 RW |
2049 | } |
2050 | ||
2051 | /** | |
ef96f639 RW |
2052 | * pack_pfns - Prepare PFNs for saving. |
2053 | * @bm: Memory bitmap. | |
2054 | * @buf: Memory buffer to store the PFNs in. | |
2055 | * | |
2056 | * PFNs corresponding to set bits in @bm are stored in the area of memory | |
2057 | * pointed to by @buf (1 page at a time). | |
f577eb30 | 2058 | */ |
efd5a852 | 2059 | static inline void pack_pfns(unsigned long *buf, struct memory_bitmap *bm) |
f577eb30 RW |
2060 | { |
2061 | int j; | |
2062 | ||
b788db79 | 2063 | for (j = 0; j < PAGE_SIZE / sizeof(long); j++) { |
940864dd RW |
2064 | buf[j] = memory_bm_next_pfn(bm); |
2065 | if (unlikely(buf[j] == BM_END_OF_MAP)) | |
b788db79 | 2066 | break; |
85055dd8 MS |
2067 | /* Save page key for data page (s390 only). */ |
2068 | page_key_read(buf + j); | |
f577eb30 | 2069 | } |
f577eb30 RW |
2070 | } |
2071 | ||
2072 | /** | |
ef96f639 RW |
2073 | * snapshot_read_next - Get the address to read the next image page from. |
2074 | * @handle: Snapshot handle to be used for the reading. | |
f577eb30 | 2075 | * |
ef96f639 RW |
2076 | * On the first call, @handle should point to a zeroed snapshot_handle |
2077 | * structure. The structure gets populated then and a pointer to it should be | |
2078 | * passed to this function every next time. | |
f577eb30 | 2079 | * |
ef96f639 RW |
2080 | * On success, the function returns a positive number. Then, the caller |
2081 | * is allowed to read up to the returned number of bytes from the memory | |
2082 | * location computed by the data_of() macro. | |
f577eb30 | 2083 | * |
ef96f639 RW |
2084 | * The function returns 0 to indicate the end of the data stream condition, |
2085 | * and negative numbers are returned on errors. If that happens, the structure | |
2086 | * pointed to by @handle is not updated and should not be used any more. | |
f577eb30 | 2087 | */ |
d3c1b24c | 2088 | int snapshot_read_next(struct snapshot_handle *handle) |
f577eb30 | 2089 | { |
fb13a28b | 2090 | if (handle->cur > nr_meta_pages + nr_copy_pages) |
f577eb30 | 2091 | return 0; |
b788db79 | 2092 | |
f577eb30 RW |
2093 | if (!buffer) { |
2094 | /* This makes the buffer be freed by swsusp_free() */ | |
8357376d | 2095 | buffer = get_image_page(GFP_ATOMIC, PG_ANY); |
f577eb30 RW |
2096 | if (!buffer) |
2097 | return -ENOMEM; | |
2098 | } | |
d3c1b24c | 2099 | if (!handle->cur) { |
d307c4a8 RW |
2100 | int error; |
2101 | ||
2102 | error = init_header((struct swsusp_info *)buffer); | |
2103 | if (error) | |
2104 | return error; | |
f577eb30 | 2105 | handle->buffer = buffer; |
b788db79 RW |
2106 | memory_bm_position_reset(&orig_bm); |
2107 | memory_bm_position_reset(©_bm); | |
d3c1b24c | 2108 | } else if (handle->cur <= nr_meta_pages) { |
3ecb01df | 2109 | clear_page(buffer); |
d3c1b24c JS |
2110 | pack_pfns(buffer, &orig_bm); |
2111 | } else { | |
2112 | struct page *page; | |
b788db79 | 2113 | |
d3c1b24c JS |
2114 | page = pfn_to_page(memory_bm_next_pfn(©_bm)); |
2115 | if (PageHighMem(page)) { | |
ef96f639 RW |
2116 | /* |
2117 | * Highmem pages are copied to the buffer, | |
d3c1b24c JS |
2118 | * because we can't return with a kmapped |
2119 | * highmem page (we may not be called again). | |
2120 | */ | |
2121 | void *kaddr; | |
8357376d | 2122 | |
0de9a1e2 | 2123 | kaddr = kmap_atomic(page); |
3ecb01df | 2124 | copy_page(buffer, kaddr); |
0de9a1e2 | 2125 | kunmap_atomic(kaddr); |
d3c1b24c JS |
2126 | handle->buffer = buffer; |
2127 | } else { | |
2128 | handle->buffer = page_address(page); | |
f577eb30 | 2129 | } |
f577eb30 | 2130 | } |
d3c1b24c JS |
2131 | handle->cur++; |
2132 | return PAGE_SIZE; | |
f577eb30 RW |
2133 | } |
2134 | ||
6dbecfd3 RW |
2135 | static void duplicate_memory_bitmap(struct memory_bitmap *dst, |
2136 | struct memory_bitmap *src) | |
2137 | { | |
2138 | unsigned long pfn; | |
2139 | ||
2140 | memory_bm_position_reset(src); | |
2141 | pfn = memory_bm_next_pfn(src); | |
2142 | while (pfn != BM_END_OF_MAP) { | |
2143 | memory_bm_set_bit(dst, pfn); | |
2144 | pfn = memory_bm_next_pfn(src); | |
2145 | } | |
2146 | } | |
2147 | ||
f577eb30 | 2148 | /** |
ef96f639 RW |
2149 | * mark_unsafe_pages - Mark pages that were used before hibernation. |
2150 | * | |
2151 | * Mark the pages that cannot be used for storing the image during restoration, | |
2152 | * because they conflict with the pages that had been used before hibernation. | |
f577eb30 | 2153 | */ |
6dbecfd3 | 2154 | static void mark_unsafe_pages(struct memory_bitmap *bm) |
f577eb30 | 2155 | { |
6dbecfd3 | 2156 | unsigned long pfn; |
f577eb30 | 2157 | |
6dbecfd3 RW |
2158 | /* Clear the "free"/"unsafe" bit for all PFNs */ |
2159 | memory_bm_position_reset(free_pages_map); | |
2160 | pfn = memory_bm_next_pfn(free_pages_map); | |
2161 | while (pfn != BM_END_OF_MAP) { | |
2162 | memory_bm_clear_current(free_pages_map); | |
2163 | pfn = memory_bm_next_pfn(free_pages_map); | |
f577eb30 RW |
2164 | } |
2165 | ||
6dbecfd3 RW |
2166 | /* Mark pages that correspond to the "original" PFNs as "unsafe" */ |
2167 | duplicate_memory_bitmap(free_pages_map, bm); | |
f577eb30 | 2168 | |
940864dd | 2169 | allocated_unsafe_pages = 0; |
f577eb30 RW |
2170 | } |
2171 | ||
d307c4a8 | 2172 | static int check_header(struct swsusp_info *info) |
f577eb30 | 2173 | { |
d307c4a8 | 2174 | char *reason; |
f577eb30 | 2175 | |
d307c4a8 | 2176 | reason = check_image_kernel(info); |
0ed5fd13 | 2177 | if (!reason && info->num_physpages != get_num_physpages()) |
f577eb30 | 2178 | reason = "memory size"; |
f577eb30 | 2179 | if (reason) { |
64ec72a1 | 2180 | pr_err("Image mismatch: %s\n", reason); |
f577eb30 RW |
2181 | return -EPERM; |
2182 | } | |
2183 | return 0; | |
2184 | } | |
2185 | ||
2186 | /** | |
ef96f639 | 2187 | * load header - Check the image header and copy the data from it. |
f577eb30 | 2188 | */ |
efd5a852 | 2189 | static int load_header(struct swsusp_info *info) |
f577eb30 RW |
2190 | { |
2191 | int error; | |
f577eb30 | 2192 | |
940864dd | 2193 | restore_pblist = NULL; |
f577eb30 RW |
2194 | error = check_header(info); |
2195 | if (!error) { | |
f577eb30 RW |
2196 | nr_copy_pages = info->image_pages; |
2197 | nr_meta_pages = info->pages - info->image_pages - 1; | |
2198 | } | |
2199 | return error; | |
2200 | } | |
2201 | ||
2202 | /** | |
ef96f639 RW |
2203 | * unpack_orig_pfns - Set bits corresponding to given PFNs in a memory bitmap. |
2204 | * @bm: Memory bitmap. | |
2205 | * @buf: Area of memory containing the PFNs. | |
2206 | * | |
2207 | * For each element of the array pointed to by @buf (1 page at a time), set the | |
2208 | * corresponding bit in @bm. | |
f577eb30 | 2209 | */ |
69643279 | 2210 | static int unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm) |
f577eb30 RW |
2211 | { |
2212 | int j; | |
2213 | ||
940864dd RW |
2214 | for (j = 0; j < PAGE_SIZE / sizeof(long); j++) { |
2215 | if (unlikely(buf[j] == BM_END_OF_MAP)) | |
2216 | break; | |
2217 | ||
85055dd8 MS |
2218 | /* Extract and buffer page key for data page (s390 only). */ |
2219 | page_key_memorize(buf + j); | |
2220 | ||
6dbecfd3 | 2221 | if (pfn_valid(buf[j]) && memory_bm_pfn_present(bm, buf[j])) |
69643279 RW |
2222 | memory_bm_set_bit(bm, buf[j]); |
2223 | else | |
2224 | return -EFAULT; | |
f577eb30 | 2225 | } |
69643279 RW |
2226 | |
2227 | return 0; | |
f577eb30 RW |
2228 | } |
2229 | ||
8357376d | 2230 | #ifdef CONFIG_HIGHMEM |
ef96f639 RW |
2231 | /* |
2232 | * struct highmem_pbe is used for creating the list of highmem pages that | |
8357376d RW |
2233 | * should be restored atomically during the resume from disk, because the page |
2234 | * frames they have occupied before the suspend are in use. | |
2235 | */ | |
2236 | struct highmem_pbe { | |
2237 | struct page *copy_page; /* data is here now */ | |
2238 | struct page *orig_page; /* data was here before the suspend */ | |
2239 | struct highmem_pbe *next; | |
2240 | }; | |
2241 | ||
ef96f639 RW |
2242 | /* |
2243 | * List of highmem PBEs needed for restoring the highmem pages that were | |
8357376d RW |
2244 | * allocated before the suspend and included in the suspend image, but have |
2245 | * also been allocated by the "resume" kernel, so their contents cannot be | |
2246 | * written directly to their "original" page frames. | |
2247 | */ | |
2248 | static struct highmem_pbe *highmem_pblist; | |
2249 | ||
2250 | /** | |
ef96f639 RW |
2251 | * count_highmem_image_pages - Compute the number of highmem pages in the image. |
2252 | * @bm: Memory bitmap. | |
2253 | * | |
2254 | * The bits in @bm that correspond to image pages are assumed to be set. | |
8357376d | 2255 | */ |
8357376d RW |
2256 | static unsigned int count_highmem_image_pages(struct memory_bitmap *bm) |
2257 | { | |
2258 | unsigned long pfn; | |
2259 | unsigned int cnt = 0; | |
2260 | ||
2261 | memory_bm_position_reset(bm); | |
2262 | pfn = memory_bm_next_pfn(bm); | |
2263 | while (pfn != BM_END_OF_MAP) { | |
2264 | if (PageHighMem(pfn_to_page(pfn))) | |
2265 | cnt++; | |
2266 | ||
2267 | pfn = memory_bm_next_pfn(bm); | |
2268 | } | |
2269 | return cnt; | |
2270 | } | |
2271 | ||
8357376d RW |
2272 | static unsigned int safe_highmem_pages; |
2273 | ||
2274 | static struct memory_bitmap *safe_highmem_bm; | |
2275 | ||
ef96f639 RW |
2276 | /** |
2277 | * prepare_highmem_image - Allocate memory for loading highmem data from image. | |
2278 | * @bm: Pointer to an uninitialized memory bitmap structure. | |
2279 | * @nr_highmem_p: Pointer to the number of highmem image pages. | |
2280 | * | |
2281 | * Try to allocate as many highmem pages as there are highmem image pages | |
2282 | * (@nr_highmem_p points to the variable containing the number of highmem image | |
2283 | * pages). The pages that are "safe" (ie. will not be overwritten when the | |
2284 | * hibernation image is restored entirely) have the corresponding bits set in | |
2285 | * @bm (it must be unitialized). | |
2286 | * | |
2287 | * NOTE: This function should not be called if there are no highmem image pages. | |
2288 | */ | |
efd5a852 RW |
2289 | static int prepare_highmem_image(struct memory_bitmap *bm, |
2290 | unsigned int *nr_highmem_p) | |
8357376d RW |
2291 | { |
2292 | unsigned int to_alloc; | |
2293 | ||
2294 | if (memory_bm_create(bm, GFP_ATOMIC, PG_SAFE)) | |
2295 | return -ENOMEM; | |
2296 | ||
2297 | if (get_highmem_buffer(PG_SAFE)) | |
2298 | return -ENOMEM; | |
2299 | ||
2300 | to_alloc = count_free_highmem_pages(); | |
2301 | if (to_alloc > *nr_highmem_p) | |
2302 | to_alloc = *nr_highmem_p; | |
2303 | else | |
2304 | *nr_highmem_p = to_alloc; | |
2305 | ||
2306 | safe_highmem_pages = 0; | |
2307 | while (to_alloc-- > 0) { | |
2308 | struct page *page; | |
2309 | ||
2310 | page = alloc_page(__GFP_HIGHMEM); | |
7be98234 | 2311 | if (!swsusp_page_is_free(page)) { |
8357376d RW |
2312 | /* The page is "safe", set its bit the bitmap */ |
2313 | memory_bm_set_bit(bm, page_to_pfn(page)); | |
2314 | safe_highmem_pages++; | |
2315 | } | |
2316 | /* Mark the page as allocated */ | |
7be98234 RW |
2317 | swsusp_set_page_forbidden(page); |
2318 | swsusp_set_page_free(page); | |
8357376d RW |
2319 | } |
2320 | memory_bm_position_reset(bm); | |
2321 | safe_highmem_bm = bm; | |
2322 | return 0; | |
2323 | } | |
2324 | ||
ef96f639 RW |
2325 | static struct page *last_highmem_page; |
2326 | ||
8357376d | 2327 | /** |
ef96f639 RW |
2328 | * get_highmem_page_buffer - Prepare a buffer to store a highmem image page. |
2329 | * | |
2330 | * For a given highmem image page get a buffer that suspend_write_next() should | |
2331 | * return to its caller to write to. | |
8357376d | 2332 | * |
ef96f639 RW |
2333 | * If the page is to be saved to its "original" page frame or a copy of |
2334 | * the page is to be made in the highmem, @buffer is returned. Otherwise, | |
2335 | * the copy of the page is to be made in normal memory, so the address of | |
2336 | * the copy is returned. | |
8357376d | 2337 | * |
ef96f639 RW |
2338 | * If @buffer is returned, the caller of suspend_write_next() will write |
2339 | * the page's contents to @buffer, so they will have to be copied to the | |
2340 | * right location on the next call to suspend_write_next() and it is done | |
2341 | * with the help of copy_last_highmem_page(). For this purpose, if | |
2342 | * @buffer is returned, @last_highmem_page is set to the page to which | |
2343 | * the data will have to be copied from @buffer. | |
8357376d | 2344 | */ |
efd5a852 RW |
2345 | static void *get_highmem_page_buffer(struct page *page, |
2346 | struct chain_allocator *ca) | |
8357376d RW |
2347 | { |
2348 | struct highmem_pbe *pbe; | |
2349 | void *kaddr; | |
2350 | ||
7be98234 | 2351 | if (swsusp_page_is_forbidden(page) && swsusp_page_is_free(page)) { |
ef96f639 RW |
2352 | /* |
2353 | * We have allocated the "original" page frame and we can | |
8357376d RW |
2354 | * use it directly to store the loaded page. |
2355 | */ | |
2356 | last_highmem_page = page; | |
2357 | return buffer; | |
2358 | } | |
ef96f639 RW |
2359 | /* |
2360 | * The "original" page frame has not been allocated and we have to | |
8357376d RW |
2361 | * use a "safe" page frame to store the loaded page. |
2362 | */ | |
2363 | pbe = chain_alloc(ca, sizeof(struct highmem_pbe)); | |
2364 | if (!pbe) { | |
2365 | swsusp_free(); | |
69643279 | 2366 | return ERR_PTR(-ENOMEM); |
8357376d RW |
2367 | } |
2368 | pbe->orig_page = page; | |
2369 | if (safe_highmem_pages > 0) { | |
2370 | struct page *tmp; | |
2371 | ||
2372 | /* Copy of the page will be stored in high memory */ | |
2373 | kaddr = buffer; | |
2374 | tmp = pfn_to_page(memory_bm_next_pfn(safe_highmem_bm)); | |
2375 | safe_highmem_pages--; | |
2376 | last_highmem_page = tmp; | |
2377 | pbe->copy_page = tmp; | |
2378 | } else { | |
2379 | /* Copy of the page will be stored in normal memory */ | |
2380 | kaddr = safe_pages_list; | |
2381 | safe_pages_list = safe_pages_list->next; | |
2382 | pbe->copy_page = virt_to_page(kaddr); | |
2383 | } | |
2384 | pbe->next = highmem_pblist; | |
2385 | highmem_pblist = pbe; | |
2386 | return kaddr; | |
2387 | } | |
2388 | ||
2389 | /** | |
ef96f639 RW |
2390 | * copy_last_highmem_page - Copy most the most recent highmem image page. |
2391 | * | |
2392 | * Copy the contents of a highmem image from @buffer, where the caller of | |
2393 | * snapshot_write_next() has stored them, to the right location represented by | |
2394 | * @last_highmem_page . | |
8357376d | 2395 | */ |
8357376d RW |
2396 | static void copy_last_highmem_page(void) |
2397 | { | |
2398 | if (last_highmem_page) { | |
2399 | void *dst; | |
2400 | ||
0de9a1e2 | 2401 | dst = kmap_atomic(last_highmem_page); |
3ecb01df | 2402 | copy_page(dst, buffer); |
0de9a1e2 | 2403 | kunmap_atomic(dst); |
8357376d RW |
2404 | last_highmem_page = NULL; |
2405 | } | |
2406 | } | |
2407 | ||
2408 | static inline int last_highmem_page_copied(void) | |
2409 | { | |
2410 | return !last_highmem_page; | |
2411 | } | |
2412 | ||
2413 | static inline void free_highmem_data(void) | |
2414 | { | |
2415 | if (safe_highmem_bm) | |
2416 | memory_bm_free(safe_highmem_bm, PG_UNSAFE_CLEAR); | |
2417 | ||
2418 | if (buffer) | |
2419 | free_image_page(buffer, PG_UNSAFE_CLEAR); | |
2420 | } | |
2421 | #else | |
efd5a852 | 2422 | static unsigned int count_highmem_image_pages(struct memory_bitmap *bm) { return 0; } |
8357376d | 2423 | |
efd5a852 RW |
2424 | static inline int prepare_highmem_image(struct memory_bitmap *bm, |
2425 | unsigned int *nr_highmem_p) { return 0; } | |
8357376d | 2426 | |
efd5a852 RW |
2427 | static inline void *get_highmem_page_buffer(struct page *page, |
2428 | struct chain_allocator *ca) | |
8357376d | 2429 | { |
69643279 | 2430 | return ERR_PTR(-EINVAL); |
8357376d RW |
2431 | } |
2432 | ||
2433 | static inline void copy_last_highmem_page(void) {} | |
2434 | static inline int last_highmem_page_copied(void) { return 1; } | |
2435 | static inline void free_highmem_data(void) {} | |
2436 | #endif /* CONFIG_HIGHMEM */ | |
2437 | ||
ef96f639 RW |
2438 | #define PBES_PER_LINKED_PAGE (LINKED_PAGE_DATA_SIZE / sizeof(struct pbe)) |
2439 | ||
f577eb30 | 2440 | /** |
ef96f639 RW |
2441 | * prepare_image - Make room for loading hibernation image. |
2442 | * @new_bm: Unitialized memory bitmap structure. | |
2443 | * @bm: Memory bitmap with unsafe pages marked. | |
2444 | * | |
2445 | * Use @bm to mark the pages that will be overwritten in the process of | |
2446 | * restoring the system memory state from the suspend image ("unsafe" pages) | |
2447 | * and allocate memory for the image. | |
968808b8 | 2448 | * |
ef96f639 RW |
2449 | * The idea is to allocate a new memory bitmap first and then allocate |
2450 | * as many pages as needed for image data, but without specifying what those | |
2451 | * pages will be used for just yet. Instead, we mark them all as allocated and | |
2452 | * create a lists of "safe" pages to be used later. On systems with high | |
2453 | * memory a list of "safe" highmem pages is created too. | |
f577eb30 | 2454 | */ |
efd5a852 | 2455 | static int prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm) |
f577eb30 | 2456 | { |
8357376d | 2457 | unsigned int nr_pages, nr_highmem; |
9c744481 | 2458 | struct linked_page *lp; |
940864dd | 2459 | int error; |
f577eb30 | 2460 | |
8357376d RW |
2461 | /* If there is no highmem, the buffer will not be necessary */ |
2462 | free_image_page(buffer, PG_UNSAFE_CLEAR); | |
2463 | buffer = NULL; | |
2464 | ||
2465 | nr_highmem = count_highmem_image_pages(bm); | |
6dbecfd3 | 2466 | mark_unsafe_pages(bm); |
940864dd RW |
2467 | |
2468 | error = memory_bm_create(new_bm, GFP_ATOMIC, PG_SAFE); | |
2469 | if (error) | |
2470 | goto Free; | |
2471 | ||
2472 | duplicate_memory_bitmap(new_bm, bm); | |
2473 | memory_bm_free(bm, PG_UNSAFE_KEEP); | |
8357376d RW |
2474 | if (nr_highmem > 0) { |
2475 | error = prepare_highmem_image(bm, &nr_highmem); | |
2476 | if (error) | |
2477 | goto Free; | |
2478 | } | |
ef96f639 RW |
2479 | /* |
2480 | * Reserve some safe pages for potential later use. | |
940864dd RW |
2481 | * |
2482 | * NOTE: This way we make sure there will be enough safe pages for the | |
2483 | * chain_alloc() in get_buffer(). It is a bit wasteful, but | |
2484 | * nr_copy_pages cannot be greater than 50% of the memory anyway. | |
9c744481 RW |
2485 | * |
2486 | * nr_copy_pages cannot be less than allocated_unsafe_pages too. | |
940864dd | 2487 | */ |
8357376d | 2488 | nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages; |
940864dd RW |
2489 | nr_pages = DIV_ROUND_UP(nr_pages, PBES_PER_LINKED_PAGE); |
2490 | while (nr_pages > 0) { | |
8357376d | 2491 | lp = get_image_page(GFP_ATOMIC, PG_SAFE); |
940864dd | 2492 | if (!lp) { |
f577eb30 | 2493 | error = -ENOMEM; |
940864dd RW |
2494 | goto Free; |
2495 | } | |
9c744481 RW |
2496 | lp->next = safe_pages_list; |
2497 | safe_pages_list = lp; | |
940864dd | 2498 | nr_pages--; |
f577eb30 | 2499 | } |
940864dd | 2500 | /* Preallocate memory for the image */ |
8357376d | 2501 | nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages; |
940864dd RW |
2502 | while (nr_pages > 0) { |
2503 | lp = (struct linked_page *)get_zeroed_page(GFP_ATOMIC); | |
2504 | if (!lp) { | |
2505 | error = -ENOMEM; | |
2506 | goto Free; | |
2507 | } | |
7be98234 | 2508 | if (!swsusp_page_is_free(virt_to_page(lp))) { |
940864dd RW |
2509 | /* The page is "safe", add it to the list */ |
2510 | lp->next = safe_pages_list; | |
2511 | safe_pages_list = lp; | |
968808b8 | 2512 | } |
940864dd | 2513 | /* Mark the page as allocated */ |
7be98234 RW |
2514 | swsusp_set_page_forbidden(virt_to_page(lp)); |
2515 | swsusp_set_page_free(virt_to_page(lp)); | |
940864dd | 2516 | nr_pages--; |
968808b8 | 2517 | } |
940864dd RW |
2518 | return 0; |
2519 | ||
59a49335 | 2520 | Free: |
940864dd | 2521 | swsusp_free(); |
f577eb30 RW |
2522 | return error; |
2523 | } | |
2524 | ||
940864dd | 2525 | /** |
ef96f639 RW |
2526 | * get_buffer - Get the address to store the next image data page. |
2527 | * | |
2528 | * Get the address that snapshot_write_next() should return to its caller to | |
2529 | * write to. | |
940864dd | 2530 | */ |
940864dd | 2531 | static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca) |
968808b8 | 2532 | { |
940864dd | 2533 | struct pbe *pbe; |
69643279 RW |
2534 | struct page *page; |
2535 | unsigned long pfn = memory_bm_next_pfn(bm); | |
968808b8 | 2536 | |
69643279 RW |
2537 | if (pfn == BM_END_OF_MAP) |
2538 | return ERR_PTR(-EFAULT); | |
2539 | ||
2540 | page = pfn_to_page(pfn); | |
8357376d RW |
2541 | if (PageHighMem(page)) |
2542 | return get_highmem_page_buffer(page, ca); | |
2543 | ||
7be98234 | 2544 | if (swsusp_page_is_forbidden(page) && swsusp_page_is_free(page)) |
ef96f639 RW |
2545 | /* |
2546 | * We have allocated the "original" page frame and we can | |
940864dd | 2547 | * use it directly to store the loaded page. |
968808b8 | 2548 | */ |
940864dd RW |
2549 | return page_address(page); |
2550 | ||
ef96f639 RW |
2551 | /* |
2552 | * The "original" page frame has not been allocated and we have to | |
940864dd | 2553 | * use a "safe" page frame to store the loaded page. |
968808b8 | 2554 | */ |
940864dd RW |
2555 | pbe = chain_alloc(ca, sizeof(struct pbe)); |
2556 | if (!pbe) { | |
2557 | swsusp_free(); | |
69643279 | 2558 | return ERR_PTR(-ENOMEM); |
940864dd | 2559 | } |
8357376d RW |
2560 | pbe->orig_address = page_address(page); |
2561 | pbe->address = safe_pages_list; | |
940864dd RW |
2562 | safe_pages_list = safe_pages_list->next; |
2563 | pbe->next = restore_pblist; | |
2564 | restore_pblist = pbe; | |
8357376d | 2565 | return pbe->address; |
968808b8 RW |
2566 | } |
2567 | ||
f577eb30 | 2568 | /** |
ef96f639 RW |
2569 | * snapshot_write_next - Get the address to store the next image page. |
2570 | * @handle: Snapshot handle structure to guide the writing. | |
f577eb30 | 2571 | * |
ef96f639 RW |
2572 | * On the first call, @handle should point to a zeroed snapshot_handle |
2573 | * structure. The structure gets populated then and a pointer to it should be | |
2574 | * passed to this function every next time. | |
f577eb30 | 2575 | * |
ef96f639 RW |
2576 | * On success, the function returns a positive number. Then, the caller |
2577 | * is allowed to write up to the returned number of bytes to the memory | |
2578 | * location computed by the data_of() macro. | |
f577eb30 | 2579 | * |
ef96f639 RW |
2580 | * The function returns 0 to indicate the "end of file" condition. Negative |
2581 | * numbers are returned on errors, in which cases the structure pointed to by | |
2582 | * @handle is not updated and should not be used any more. | |
f577eb30 | 2583 | */ |
d3c1b24c | 2584 | int snapshot_write_next(struct snapshot_handle *handle) |
f577eb30 | 2585 | { |
940864dd | 2586 | static struct chain_allocator ca; |
f577eb30 RW |
2587 | int error = 0; |
2588 | ||
940864dd | 2589 | /* Check if we have already loaded the entire image */ |
d3c1b24c | 2590 | if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) |
f577eb30 | 2591 | return 0; |
940864dd | 2592 | |
d3c1b24c JS |
2593 | handle->sync_read = 1; |
2594 | ||
2595 | if (!handle->cur) { | |
8357376d RW |
2596 | if (!buffer) |
2597 | /* This makes the buffer be freed by swsusp_free() */ | |
2598 | buffer = get_image_page(GFP_ATOMIC, PG_ANY); | |
2599 | ||
f577eb30 RW |
2600 | if (!buffer) |
2601 | return -ENOMEM; | |
8357376d | 2602 | |
f577eb30 | 2603 | handle->buffer = buffer; |
d3c1b24c JS |
2604 | } else if (handle->cur == 1) { |
2605 | error = load_header(buffer); | |
2606 | if (error) | |
2607 | return error; | |
940864dd | 2608 | |
9c744481 RW |
2609 | safe_pages_list = NULL; |
2610 | ||
d3c1b24c JS |
2611 | error = memory_bm_create(©_bm, GFP_ATOMIC, PG_ANY); |
2612 | if (error) | |
2613 | return error; | |
2614 | ||
85055dd8 MS |
2615 | /* Allocate buffer for page keys. */ |
2616 | error = page_key_alloc(nr_copy_pages); | |
2617 | if (error) | |
2618 | return error; | |
2619 | ||
4c0b6c10 | 2620 | hibernate_restore_protection_begin(); |
d3c1b24c JS |
2621 | } else if (handle->cur <= nr_meta_pages + 1) { |
2622 | error = unpack_orig_pfns(buffer, ©_bm); | |
2623 | if (error) | |
2624 | return error; | |
940864dd | 2625 | |
d3c1b24c JS |
2626 | if (handle->cur == nr_meta_pages + 1) { |
2627 | error = prepare_image(&orig_bm, ©_bm); | |
69643279 RW |
2628 | if (error) |
2629 | return error; | |
2630 | ||
d3c1b24c JS |
2631 | chain_init(&ca, GFP_ATOMIC, PG_SAFE); |
2632 | memory_bm_position_reset(&orig_bm); | |
2633 | restore_pblist = NULL; | |
940864dd | 2634 | handle->buffer = get_buffer(&orig_bm, &ca); |
d3c1b24c | 2635 | handle->sync_read = 0; |
69643279 RW |
2636 | if (IS_ERR(handle->buffer)) |
2637 | return PTR_ERR(handle->buffer); | |
f577eb30 | 2638 | } |
f577eb30 | 2639 | } else { |
d3c1b24c | 2640 | copy_last_highmem_page(); |
85055dd8 MS |
2641 | /* Restore page key for data page (s390 only). */ |
2642 | page_key_write(handle->buffer); | |
4c0b6c10 | 2643 | hibernate_restore_protect_page(handle->buffer); |
d3c1b24c JS |
2644 | handle->buffer = get_buffer(&orig_bm, &ca); |
2645 | if (IS_ERR(handle->buffer)) | |
2646 | return PTR_ERR(handle->buffer); | |
2647 | if (handle->buffer != buffer) | |
2648 | handle->sync_read = 0; | |
f577eb30 | 2649 | } |
d3c1b24c JS |
2650 | handle->cur++; |
2651 | return PAGE_SIZE; | |
f577eb30 RW |
2652 | } |
2653 | ||
8357376d | 2654 | /** |
ef96f639 RW |
2655 | * snapshot_write_finalize - Complete the loading of a hibernation image. |
2656 | * | |
2657 | * Must be called after the last call to snapshot_write_next() in case the last | |
2658 | * page in the image happens to be a highmem page and its contents should be | |
2659 | * stored in highmem. Additionally, it recycles bitmap memory that's not | |
2660 | * necessary any more. | |
8357376d | 2661 | */ |
8357376d RW |
2662 | void snapshot_write_finalize(struct snapshot_handle *handle) |
2663 | { | |
2664 | copy_last_highmem_page(); | |
85055dd8 MS |
2665 | /* Restore page key for data page (s390 only). */ |
2666 | page_key_write(handle->buffer); | |
2667 | page_key_free(); | |
4c0b6c10 | 2668 | hibernate_restore_protect_page(handle->buffer); |
307c5971 | 2669 | /* Do that only if we have loaded the image entirely */ |
d3c1b24c | 2670 | if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) { |
307c5971 | 2671 | memory_bm_recycle(&orig_bm); |
8357376d RW |
2672 | free_highmem_data(); |
2673 | } | |
2674 | } | |
2675 | ||
f577eb30 RW |
2676 | int snapshot_image_loaded(struct snapshot_handle *handle) |
2677 | { | |
8357376d | 2678 | return !(!nr_copy_pages || !last_highmem_page_copied() || |
940864dd RW |
2679 | handle->cur <= nr_meta_pages + nr_copy_pages); |
2680 | } | |
2681 | ||
8357376d RW |
2682 | #ifdef CONFIG_HIGHMEM |
2683 | /* Assumes that @buf is ready and points to a "safe" page */ | |
efd5a852 RW |
2684 | static inline void swap_two_pages_data(struct page *p1, struct page *p2, |
2685 | void *buf) | |
940864dd | 2686 | { |
8357376d RW |
2687 | void *kaddr1, *kaddr2; |
2688 | ||
0de9a1e2 CW |
2689 | kaddr1 = kmap_atomic(p1); |
2690 | kaddr2 = kmap_atomic(p2); | |
3ecb01df JB |
2691 | copy_page(buf, kaddr1); |
2692 | copy_page(kaddr1, kaddr2); | |
2693 | copy_page(kaddr2, buf); | |
0de9a1e2 CW |
2694 | kunmap_atomic(kaddr2); |
2695 | kunmap_atomic(kaddr1); | |
8357376d RW |
2696 | } |
2697 | ||
2698 | /** | |
ef96f639 RW |
2699 | * restore_highmem - Put highmem image pages into their original locations. |
2700 | * | |
2701 | * For each highmem page that was in use before hibernation and is included in | |
2702 | * the image, and also has been allocated by the "restore" kernel, swap its | |
2703 | * current contents with the previous (ie. "before hibernation") ones. | |
8357376d | 2704 | * |
ef96f639 RW |
2705 | * If the restore eventually fails, we can call this function once again and |
2706 | * restore the highmem state as seen by the restore kernel. | |
8357376d | 2707 | */ |
8357376d RW |
2708 | int restore_highmem(void) |
2709 | { | |
2710 | struct highmem_pbe *pbe = highmem_pblist; | |
2711 | void *buf; | |
2712 | ||
2713 | if (!pbe) | |
2714 | return 0; | |
2715 | ||
2716 | buf = get_image_page(GFP_ATOMIC, PG_SAFE); | |
2717 | if (!buf) | |
2718 | return -ENOMEM; | |
2719 | ||
2720 | while (pbe) { | |
2721 | swap_two_pages_data(pbe->copy_page, pbe->orig_page, buf); | |
2722 | pbe = pbe->next; | |
2723 | } | |
2724 | free_image_page(buf, PG_UNSAFE_CLEAR); | |
2725 | return 0; | |
f577eb30 | 2726 | } |
8357376d | 2727 | #endif /* CONFIG_HIGHMEM */ |