Commit | Line | Data |
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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 | ||
7a7b99bf | 11 | #define pr_fmt(fmt) "PM: hibernation: " fmt |
64ec72a1 | 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 | 36 | #include <asm/mmu_context.h> |
25761b6e RW |
37 | #include <asm/tlbflush.h> |
38 | #include <asm/io.h> | |
39 | ||
25761b6e RW |
40 | #include "power.h" |
41 | ||
49368a47 | 42 | #if defined(CONFIG_STRICT_KERNEL_RWX) && defined(CONFIG_ARCH_HAS_SET_MEMORY) |
4c0b6c10 RW |
43 | static bool hibernate_restore_protection; |
44 | static bool hibernate_restore_protection_active; | |
45 | ||
46 | void enable_restore_image_protection(void) | |
47 | { | |
48 | hibernate_restore_protection = true; | |
49 | } | |
50 | ||
51 | static inline void hibernate_restore_protection_begin(void) | |
52 | { | |
53 | hibernate_restore_protection_active = hibernate_restore_protection; | |
54 | } | |
55 | ||
56 | static inline void hibernate_restore_protection_end(void) | |
57 | { | |
58 | hibernate_restore_protection_active = false; | |
59 | } | |
60 | ||
61 | static inline void hibernate_restore_protect_page(void *page_address) | |
62 | { | |
63 | if (hibernate_restore_protection_active) | |
64 | set_memory_ro((unsigned long)page_address, 1); | |
65 | } | |
66 | ||
67 | static inline void hibernate_restore_unprotect_page(void *page_address) | |
68 | { | |
69 | if (hibernate_restore_protection_active) | |
70 | set_memory_rw((unsigned long)page_address, 1); | |
71 | } | |
72 | #else | |
73 | static inline void hibernate_restore_protection_begin(void) {} | |
74 | static inline void hibernate_restore_protection_end(void) {} | |
75 | static inline void hibernate_restore_protect_page(void *page_address) {} | |
76 | static inline void hibernate_restore_unprotect_page(void *page_address) {} | |
49368a47 | 77 | #endif /* CONFIG_STRICT_KERNEL_RWX && CONFIG_ARCH_HAS_SET_MEMORY */ |
4c0b6c10 | 78 | |
2abf962a MR |
79 | |
80 | /* | |
81 | * The calls to set_direct_map_*() should not fail because remapping a page | |
82 | * here means that we only update protection bits in an existing PTE. | |
83 | * It is still worth to have a warning here if something changes and this | |
84 | * will no longer be the case. | |
85 | */ | |
86 | static inline void hibernate_map_page(struct page *page) | |
87 | { | |
88 | if (IS_ENABLED(CONFIG_ARCH_HAS_SET_DIRECT_MAP)) { | |
89 | int ret = set_direct_map_default_noflush(page); | |
90 | ||
91 | if (ret) | |
92 | pr_warn_once("Failed to remap page\n"); | |
93 | } else { | |
94 | debug_pagealloc_map_pages(page, 1); | |
95 | } | |
96 | } | |
97 | ||
98 | static inline void hibernate_unmap_page(struct page *page) | |
99 | { | |
100 | if (IS_ENABLED(CONFIG_ARCH_HAS_SET_DIRECT_MAP)) { | |
101 | unsigned long addr = (unsigned long)page_address(page); | |
102 | int ret = set_direct_map_invalid_noflush(page); | |
103 | ||
104 | if (ret) | |
105 | pr_warn_once("Failed to remap page\n"); | |
106 | ||
107 | flush_tlb_kernel_range(addr, addr + PAGE_SIZE); | |
108 | } else { | |
109 | debug_pagealloc_unmap_pages(page, 1); | |
110 | } | |
111 | } | |
112 | ||
74dfd666 RW |
113 | static int swsusp_page_is_free(struct page *); |
114 | static void swsusp_set_page_forbidden(struct page *); | |
115 | static void swsusp_unset_page_forbidden(struct page *); | |
116 | ||
ddeb6487 RW |
117 | /* |
118 | * Number of bytes to reserve for memory allocations made by device drivers | |
119 | * from their ->freeze() and ->freeze_noirq() callbacks so that they don't | |
120 | * cause image creation to fail (tunable via /sys/power/reserved_size). | |
121 | */ | |
122 | unsigned long reserved_size; | |
123 | ||
124 | void __init hibernate_reserved_size_init(void) | |
125 | { | |
126 | reserved_size = SPARE_PAGES * PAGE_SIZE; | |
127 | } | |
128 | ||
fe419535 RW |
129 | /* |
130 | * Preferred image size in bytes (tunable via /sys/power/image_size). | |
1c1be3a9 RW |
131 | * When it is set to N, swsusp will do its best to ensure the image |
132 | * size will not exceed N bytes, but if that is impossible, it will | |
133 | * try to create the smallest image possible. | |
fe419535 | 134 | */ |
ac5c24ec RW |
135 | unsigned long image_size; |
136 | ||
137 | void __init hibernate_image_size_init(void) | |
138 | { | |
ca79b0c2 | 139 | image_size = ((totalram_pages() * 2) / 5) * PAGE_SIZE; |
ac5c24ec | 140 | } |
fe419535 | 141 | |
ef96f639 RW |
142 | /* |
143 | * List of PBEs needed for restoring the pages that were allocated before | |
8357376d RW |
144 | * the suspend and included in the suspend image, but have also been |
145 | * allocated by the "resume" kernel, so their contents cannot be written | |
146 | * directly to their "original" page frames. | |
147 | */ | |
75534b50 RW |
148 | struct pbe *restore_pblist; |
149 | ||
9c744481 RW |
150 | /* struct linked_page is used to build chains of pages */ |
151 | ||
152 | #define LINKED_PAGE_DATA_SIZE (PAGE_SIZE - sizeof(void *)) | |
153 | ||
154 | struct linked_page { | |
155 | struct linked_page *next; | |
156 | char data[LINKED_PAGE_DATA_SIZE]; | |
157 | } __packed; | |
158 | ||
159 | /* | |
160 | * List of "safe" pages (ie. pages that were not used by the image kernel | |
161 | * before hibernation) that may be used as temporary storage for image kernel | |
162 | * memory contents. | |
163 | */ | |
164 | static struct linked_page *safe_pages_list; | |
165 | ||
8357376d | 166 | /* Pointer to an auxiliary buffer (1 page) */ |
940864dd | 167 | static void *buffer; |
7088a5c0 | 168 | |
0bcd888d RW |
169 | #define PG_ANY 0 |
170 | #define PG_SAFE 1 | |
171 | #define PG_UNSAFE_CLEAR 1 | |
172 | #define PG_UNSAFE_KEEP 0 | |
173 | ||
940864dd | 174 | static unsigned int allocated_unsafe_pages; |
f6143aa6 | 175 | |
ef96f639 RW |
176 | /** |
177 | * get_image_page - Allocate a page for a hibernation image. | |
178 | * @gfp_mask: GFP mask for the allocation. | |
179 | * @safe_needed: Get pages that were not used before hibernation (restore only) | |
180 | * | |
181 | * During image restoration, for storing the PBE list and the image data, we can | |
182 | * only use memory pages that do not conflict with the pages used before | |
183 | * hibernation. The "unsafe" pages have PageNosaveFree set and we count them | |
184 | * using allocated_unsafe_pages. | |
185 | * | |
186 | * Each allocated image page is marked as PageNosave and PageNosaveFree so that | |
187 | * swsusp_free() can release it. | |
188 | */ | |
8357376d | 189 | static void *get_image_page(gfp_t gfp_mask, int safe_needed) |
f6143aa6 RW |
190 | { |
191 | void *res; | |
192 | ||
193 | res = (void *)get_zeroed_page(gfp_mask); | |
194 | if (safe_needed) | |
7be98234 | 195 | while (res && swsusp_page_is_free(virt_to_page(res))) { |
f6143aa6 | 196 | /* The page is unsafe, mark it for swsusp_free() */ |
7be98234 | 197 | swsusp_set_page_forbidden(virt_to_page(res)); |
940864dd | 198 | allocated_unsafe_pages++; |
f6143aa6 RW |
199 | res = (void *)get_zeroed_page(gfp_mask); |
200 | } | |
201 | if (res) { | |
7be98234 RW |
202 | swsusp_set_page_forbidden(virt_to_page(res)); |
203 | swsusp_set_page_free(virt_to_page(res)); | |
f6143aa6 RW |
204 | } |
205 | return res; | |
206 | } | |
207 | ||
9c744481 RW |
208 | static void *__get_safe_page(gfp_t gfp_mask) |
209 | { | |
210 | if (safe_pages_list) { | |
211 | void *ret = safe_pages_list; | |
212 | ||
213 | safe_pages_list = safe_pages_list->next; | |
214 | memset(ret, 0, PAGE_SIZE); | |
215 | return ret; | |
216 | } | |
217 | return get_image_page(gfp_mask, PG_SAFE); | |
218 | } | |
219 | ||
f6143aa6 RW |
220 | unsigned long get_safe_page(gfp_t gfp_mask) |
221 | { | |
9c744481 | 222 | return (unsigned long)__get_safe_page(gfp_mask); |
8357376d RW |
223 | } |
224 | ||
5b6d15de RW |
225 | static struct page *alloc_image_page(gfp_t gfp_mask) |
226 | { | |
8357376d RW |
227 | struct page *page; |
228 | ||
229 | page = alloc_page(gfp_mask); | |
230 | if (page) { | |
7be98234 RW |
231 | swsusp_set_page_forbidden(page); |
232 | swsusp_set_page_free(page); | |
8357376d RW |
233 | } |
234 | return page; | |
f6143aa6 RW |
235 | } |
236 | ||
307c5971 RW |
237 | static void recycle_safe_page(void *page_address) |
238 | { | |
239 | struct linked_page *lp = page_address; | |
240 | ||
241 | lp->next = safe_pages_list; | |
242 | safe_pages_list = lp; | |
243 | } | |
244 | ||
f6143aa6 | 245 | /** |
ef96f639 RW |
246 | * free_image_page - Free a page allocated for hibernation image. |
247 | * @addr: Address of the page to free. | |
248 | * @clear_nosave_free: If set, clear the PageNosaveFree bit for the page. | |
249 | * | |
250 | * The page to free should have been allocated by get_image_page() (page flags | |
251 | * set by it are affected). | |
f6143aa6 | 252 | */ |
f6143aa6 RW |
253 | static inline void free_image_page(void *addr, int clear_nosave_free) |
254 | { | |
8357376d RW |
255 | struct page *page; |
256 | ||
257 | BUG_ON(!virt_addr_valid(addr)); | |
258 | ||
259 | page = virt_to_page(addr); | |
260 | ||
7be98234 | 261 | swsusp_unset_page_forbidden(page); |
f6143aa6 | 262 | if (clear_nosave_free) |
7be98234 | 263 | swsusp_unset_page_free(page); |
8357376d RW |
264 | |
265 | __free_page(page); | |
f6143aa6 RW |
266 | } |
267 | ||
efd5a852 RW |
268 | static inline void free_list_of_pages(struct linked_page *list, |
269 | int clear_page_nosave) | |
b788db79 RW |
270 | { |
271 | while (list) { | |
272 | struct linked_page *lp = list->next; | |
273 | ||
274 | free_image_page(list, clear_page_nosave); | |
275 | list = lp; | |
276 | } | |
277 | } | |
278 | ||
ef96f639 RW |
279 | /* |
280 | * struct chain_allocator is used for allocating small objects out of | |
281 | * a linked list of pages called 'the chain'. | |
282 | * | |
283 | * The chain grows each time when there is no room for a new object in | |
284 | * the current page. The allocated objects cannot be freed individually. | |
285 | * It is only possible to free them all at once, by freeing the entire | |
286 | * chain. | |
287 | * | |
288 | * NOTE: The chain allocator may be inefficient if the allocated objects | |
289 | * are not much smaller than PAGE_SIZE. | |
290 | */ | |
b788db79 RW |
291 | struct chain_allocator { |
292 | struct linked_page *chain; /* the chain */ | |
293 | unsigned int used_space; /* total size of objects allocated out | |
ef96f639 | 294 | of the current page */ |
b788db79 RW |
295 | gfp_t gfp_mask; /* mask for allocating pages */ |
296 | int safe_needed; /* if set, only "safe" pages are allocated */ | |
297 | }; | |
298 | ||
efd5a852 RW |
299 | static void chain_init(struct chain_allocator *ca, gfp_t gfp_mask, |
300 | int safe_needed) | |
b788db79 RW |
301 | { |
302 | ca->chain = NULL; | |
303 | ca->used_space = LINKED_PAGE_DATA_SIZE; | |
304 | ca->gfp_mask = gfp_mask; | |
305 | ca->safe_needed = safe_needed; | |
306 | } | |
307 | ||
308 | static void *chain_alloc(struct chain_allocator *ca, unsigned int size) | |
309 | { | |
310 | void *ret; | |
311 | ||
312 | if (LINKED_PAGE_DATA_SIZE - ca->used_space < size) { | |
313 | struct linked_page *lp; | |
314 | ||
9c744481 RW |
315 | lp = ca->safe_needed ? __get_safe_page(ca->gfp_mask) : |
316 | get_image_page(ca->gfp_mask, PG_ANY); | |
b788db79 RW |
317 | if (!lp) |
318 | return NULL; | |
319 | ||
320 | lp->next = ca->chain; | |
321 | ca->chain = lp; | |
322 | ca->used_space = 0; | |
323 | } | |
324 | ret = ca->chain->data + ca->used_space; | |
325 | ca->used_space += size; | |
326 | return ret; | |
327 | } | |
328 | ||
b788db79 | 329 | /** |
ef96f639 | 330 | * Data types related to memory bitmaps. |
b788db79 | 331 | * |
e4b2897a | 332 | * Memory bitmap is a structure consisting of many linked lists of |
ef96f639 RW |
333 | * objects. The main list's elements are of type struct zone_bitmap |
334 | * and each of them corresonds to one zone. For each zone bitmap | |
335 | * object there is a list of objects of type struct bm_block that | |
336 | * represent each blocks of bitmap in which information is stored. | |
b788db79 | 337 | * |
ef96f639 RW |
338 | * struct memory_bitmap contains a pointer to the main list of zone |
339 | * bitmap objects, a struct bm_position used for browsing the bitmap, | |
340 | * and a pointer to the list of pages used for allocating all of the | |
341 | * zone bitmap objects and bitmap block objects. | |
b788db79 | 342 | * |
ef96f639 RW |
343 | * NOTE: It has to be possible to lay out the bitmap in memory |
344 | * using only allocations of order 0. Additionally, the bitmap is | |
345 | * designed to work with arbitrary number of zones (this is over the | |
346 | * top for now, but let's avoid making unnecessary assumptions ;-). | |
b788db79 | 347 | * |
ef96f639 RW |
348 | * struct zone_bitmap contains a pointer to a list of bitmap block |
349 | * objects and a pointer to the bitmap block object that has been | |
350 | * most recently used for setting bits. Additionally, it contains the | |
351 | * PFNs that correspond to the start and end of the represented zone. | |
b788db79 | 352 | * |
ef96f639 RW |
353 | * struct bm_block contains a pointer to the memory page in which |
354 | * information is stored (in the form of a block of bitmap) | |
355 | * It also contains the pfns that correspond to the start and end of | |
356 | * the represented memory area. | |
f469f02d | 357 | * |
ef96f639 RW |
358 | * The memory bitmap is organized as a radix tree to guarantee fast random |
359 | * access to the bits. There is one radix tree for each zone (as returned | |
360 | * from create_mem_extents). | |
f469f02d | 361 | * |
ef96f639 RW |
362 | * One radix tree is represented by one struct mem_zone_bm_rtree. There are |
363 | * two linked lists for the nodes of the tree, one for the inner nodes and | |
364 | * one for the leave nodes. The linked leave nodes are used for fast linear | |
365 | * access of the memory bitmap. | |
f469f02d | 366 | * |
ef96f639 | 367 | * The struct rtree_node represents one node of the radix tree. |
b788db79 RW |
368 | */ |
369 | ||
370 | #define BM_END_OF_MAP (~0UL) | |
371 | ||
8de03073 | 372 | #define BM_BITS_PER_BLOCK (PAGE_SIZE * BITS_PER_BYTE) |
f469f02d JR |
373 | #define BM_BLOCK_SHIFT (PAGE_SHIFT + 3) |
374 | #define BM_BLOCK_MASK ((1UL << BM_BLOCK_SHIFT) - 1) | |
b788db79 | 375 | |
f469f02d JR |
376 | /* |
377 | * struct rtree_node is a wrapper struct to link the nodes | |
378 | * of the rtree together for easy linear iteration over | |
379 | * bits and easy freeing | |
380 | */ | |
381 | struct rtree_node { | |
382 | struct list_head list; | |
383 | unsigned long *data; | |
384 | }; | |
385 | ||
386 | /* | |
387 | * struct mem_zone_bm_rtree represents a bitmap used for one | |
388 | * populated memory zone. | |
389 | */ | |
390 | struct mem_zone_bm_rtree { | |
391 | struct list_head list; /* Link Zones together */ | |
392 | struct list_head nodes; /* Radix Tree inner nodes */ | |
393 | struct list_head leaves; /* Radix Tree leaves */ | |
394 | unsigned long start_pfn; /* Zone start page frame */ | |
395 | unsigned long end_pfn; /* Zone end page frame + 1 */ | |
396 | struct rtree_node *rtree; /* Radix Tree Root */ | |
397 | int levels; /* Number of Radix Tree Levels */ | |
398 | unsigned int blocks; /* Number of Bitmap Blocks */ | |
399 | }; | |
400 | ||
b788db79 RW |
401 | /* strcut bm_position is used for browsing memory bitmaps */ |
402 | ||
403 | struct bm_position { | |
3a20cb17 JR |
404 | struct mem_zone_bm_rtree *zone; |
405 | struct rtree_node *node; | |
406 | unsigned long node_pfn; | |
407 | int node_bit; | |
b788db79 RW |
408 | }; |
409 | ||
410 | struct memory_bitmap { | |
f469f02d | 411 | struct list_head zones; |
b788db79 | 412 | struct linked_page *p_list; /* list of pages used to store zone |
ef96f639 RW |
413 | bitmap objects and bitmap block |
414 | objects */ | |
b788db79 RW |
415 | struct bm_position cur; /* most recently used bit position */ |
416 | }; | |
417 | ||
418 | /* Functions that operate on memory bitmaps */ | |
419 | ||
f469f02d JR |
420 | #define BM_ENTRIES_PER_LEVEL (PAGE_SIZE / sizeof(unsigned long)) |
421 | #if BITS_PER_LONG == 32 | |
422 | #define BM_RTREE_LEVEL_SHIFT (PAGE_SHIFT - 2) | |
423 | #else | |
424 | #define BM_RTREE_LEVEL_SHIFT (PAGE_SHIFT - 3) | |
425 | #endif | |
426 | #define BM_RTREE_LEVEL_MASK ((1UL << BM_RTREE_LEVEL_SHIFT) - 1) | |
427 | ||
ef96f639 RW |
428 | /** |
429 | * alloc_rtree_node - Allocate a new node and add it to the radix tree. | |
f469f02d | 430 | * |
ef96f639 RW |
431 | * This function is used to allocate inner nodes as well as the |
432 | * leave nodes of the radix tree. It also adds the node to the | |
433 | * corresponding linked list passed in by the *list parameter. | |
f469f02d JR |
434 | */ |
435 | static struct rtree_node *alloc_rtree_node(gfp_t gfp_mask, int safe_needed, | |
436 | struct chain_allocator *ca, | |
437 | struct list_head *list) | |
438 | { | |
439 | struct rtree_node *node; | |
440 | ||
441 | node = chain_alloc(ca, sizeof(struct rtree_node)); | |
442 | if (!node) | |
443 | return NULL; | |
444 | ||
445 | node->data = get_image_page(gfp_mask, safe_needed); | |
446 | if (!node->data) | |
447 | return NULL; | |
448 | ||
449 | list_add_tail(&node->list, list); | |
450 | ||
451 | return node; | |
452 | } | |
453 | ||
ef96f639 RW |
454 | /** |
455 | * add_rtree_block - Add a new leave node to the radix tree. | |
f469f02d | 456 | * |
ef96f639 RW |
457 | * The leave nodes need to be allocated in order to keep the leaves |
458 | * linked list in order. This is guaranteed by the zone->blocks | |
459 | * counter. | |
f469f02d JR |
460 | */ |
461 | static int add_rtree_block(struct mem_zone_bm_rtree *zone, gfp_t gfp_mask, | |
462 | int safe_needed, struct chain_allocator *ca) | |
463 | { | |
464 | struct rtree_node *node, *block, **dst; | |
465 | unsigned int levels_needed, block_nr; | |
466 | int i; | |
467 | ||
468 | block_nr = zone->blocks; | |
469 | levels_needed = 0; | |
470 | ||
471 | /* How many levels do we need for this block nr? */ | |
472 | while (block_nr) { | |
473 | levels_needed += 1; | |
474 | block_nr >>= BM_RTREE_LEVEL_SHIFT; | |
475 | } | |
476 | ||
477 | /* Make sure the rtree has enough levels */ | |
478 | for (i = zone->levels; i < levels_needed; i++) { | |
479 | node = alloc_rtree_node(gfp_mask, safe_needed, ca, | |
480 | &zone->nodes); | |
481 | if (!node) | |
482 | return -ENOMEM; | |
483 | ||
484 | node->data[0] = (unsigned long)zone->rtree; | |
485 | zone->rtree = node; | |
486 | zone->levels += 1; | |
487 | } | |
488 | ||
489 | /* Allocate new block */ | |
490 | block = alloc_rtree_node(gfp_mask, safe_needed, ca, &zone->leaves); | |
491 | if (!block) | |
492 | return -ENOMEM; | |
493 | ||
494 | /* Now walk the rtree to insert the block */ | |
495 | node = zone->rtree; | |
496 | dst = &zone->rtree; | |
497 | block_nr = zone->blocks; | |
498 | for (i = zone->levels; i > 0; i--) { | |
499 | int index; | |
500 | ||
501 | if (!node) { | |
502 | node = alloc_rtree_node(gfp_mask, safe_needed, ca, | |
503 | &zone->nodes); | |
504 | if (!node) | |
505 | return -ENOMEM; | |
506 | *dst = node; | |
507 | } | |
508 | ||
509 | index = block_nr >> ((i - 1) * BM_RTREE_LEVEL_SHIFT); | |
510 | index &= BM_RTREE_LEVEL_MASK; | |
511 | dst = (struct rtree_node **)&((*dst)->data[index]); | |
512 | node = *dst; | |
513 | } | |
514 | ||
515 | zone->blocks += 1; | |
516 | *dst = block; | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | static void free_zone_bm_rtree(struct mem_zone_bm_rtree *zone, | |
522 | int clear_nosave_free); | |
523 | ||
ef96f639 RW |
524 | /** |
525 | * create_zone_bm_rtree - Create a radix tree for one zone. | |
f469f02d | 526 | * |
ef96f639 RW |
527 | * Allocated the mem_zone_bm_rtree structure and initializes it. |
528 | * This function also allocated and builds the radix tree for the | |
529 | * zone. | |
f469f02d | 530 | */ |
efd5a852 RW |
531 | static struct mem_zone_bm_rtree *create_zone_bm_rtree(gfp_t gfp_mask, |
532 | int safe_needed, | |
533 | struct chain_allocator *ca, | |
534 | unsigned long start, | |
535 | unsigned long end) | |
f469f02d JR |
536 | { |
537 | struct mem_zone_bm_rtree *zone; | |
538 | unsigned int i, nr_blocks; | |
539 | unsigned long pages; | |
540 | ||
541 | pages = end - start; | |
542 | zone = chain_alloc(ca, sizeof(struct mem_zone_bm_rtree)); | |
543 | if (!zone) | |
544 | return NULL; | |
545 | ||
546 | INIT_LIST_HEAD(&zone->nodes); | |
547 | INIT_LIST_HEAD(&zone->leaves); | |
548 | zone->start_pfn = start; | |
549 | zone->end_pfn = end; | |
550 | nr_blocks = DIV_ROUND_UP(pages, BM_BITS_PER_BLOCK); | |
551 | ||
552 | for (i = 0; i < nr_blocks; i++) { | |
553 | if (add_rtree_block(zone, gfp_mask, safe_needed, ca)) { | |
554 | free_zone_bm_rtree(zone, PG_UNSAFE_CLEAR); | |
555 | return NULL; | |
556 | } | |
557 | } | |
558 | ||
559 | return zone; | |
560 | } | |
561 | ||
ef96f639 RW |
562 | /** |
563 | * free_zone_bm_rtree - Free the memory of the radix tree. | |
f469f02d | 564 | * |
ef96f639 RW |
565 | * Free all node pages of the radix tree. The mem_zone_bm_rtree |
566 | * structure itself is not freed here nor are the rtree_node | |
567 | * structs. | |
f469f02d JR |
568 | */ |
569 | static void free_zone_bm_rtree(struct mem_zone_bm_rtree *zone, | |
570 | int clear_nosave_free) | |
571 | { | |
572 | struct rtree_node *node; | |
573 | ||
574 | list_for_each_entry(node, &zone->nodes, list) | |
575 | free_image_page(node->data, clear_nosave_free); | |
576 | ||
577 | list_for_each_entry(node, &zone->leaves, list) | |
578 | free_image_page(node->data, clear_nosave_free); | |
579 | } | |
580 | ||
b788db79 RW |
581 | static void memory_bm_position_reset(struct memory_bitmap *bm) |
582 | { | |
3a20cb17 JR |
583 | bm->cur.zone = list_entry(bm->zones.next, struct mem_zone_bm_rtree, |
584 | list); | |
585 | bm->cur.node = list_entry(bm->cur.zone->leaves.next, | |
586 | struct rtree_node, list); | |
587 | bm->cur.node_pfn = 0; | |
588 | bm->cur.node_bit = 0; | |
b788db79 RW |
589 | } |
590 | ||
591 | static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free); | |
592 | ||
846705de RW |
593 | struct mem_extent { |
594 | struct list_head hook; | |
595 | unsigned long start; | |
596 | unsigned long end; | |
597 | }; | |
598 | ||
b788db79 | 599 | /** |
ef96f639 RW |
600 | * free_mem_extents - Free a list of memory extents. |
601 | * @list: List of extents to free. | |
b788db79 | 602 | */ |
846705de RW |
603 | static void free_mem_extents(struct list_head *list) |
604 | { | |
605 | struct mem_extent *ext, *aux; | |
b788db79 | 606 | |
846705de RW |
607 | list_for_each_entry_safe(ext, aux, list, hook) { |
608 | list_del(&ext->hook); | |
609 | kfree(ext); | |
610 | } | |
611 | } | |
612 | ||
613 | /** | |
ef96f639 RW |
614 | * create_mem_extents - Create a list of memory extents. |
615 | * @list: List to put the extents into. | |
616 | * @gfp_mask: Mask to use for memory allocations. | |
617 | * | |
618 | * The extents represent contiguous ranges of PFNs. | |
846705de RW |
619 | */ |
620 | static int create_mem_extents(struct list_head *list, gfp_t gfp_mask) | |
b788db79 | 621 | { |
846705de | 622 | struct zone *zone; |
b788db79 | 623 | |
846705de | 624 | INIT_LIST_HEAD(list); |
b788db79 | 625 | |
ee99c71c | 626 | for_each_populated_zone(zone) { |
846705de RW |
627 | unsigned long zone_start, zone_end; |
628 | struct mem_extent *ext, *cur, *aux; | |
629 | ||
846705de | 630 | zone_start = zone->zone_start_pfn; |
c33bc315 | 631 | zone_end = zone_end_pfn(zone); |
846705de RW |
632 | |
633 | list_for_each_entry(ext, list, hook) | |
634 | if (zone_start <= ext->end) | |
635 | break; | |
b788db79 | 636 | |
846705de RW |
637 | if (&ext->hook == list || zone_end < ext->start) { |
638 | /* New extent is necessary */ | |
639 | struct mem_extent *new_ext; | |
640 | ||
641 | new_ext = kzalloc(sizeof(struct mem_extent), gfp_mask); | |
642 | if (!new_ext) { | |
643 | free_mem_extents(list); | |
644 | return -ENOMEM; | |
645 | } | |
646 | new_ext->start = zone_start; | |
647 | new_ext->end = zone_end; | |
648 | list_add_tail(&new_ext->hook, &ext->hook); | |
649 | continue; | |
650 | } | |
651 | ||
652 | /* Merge this zone's range of PFNs with the existing one */ | |
653 | if (zone_start < ext->start) | |
654 | ext->start = zone_start; | |
655 | if (zone_end > ext->end) | |
656 | ext->end = zone_end; | |
657 | ||
658 | /* More merging may be possible */ | |
659 | cur = ext; | |
660 | list_for_each_entry_safe_continue(cur, aux, list, hook) { | |
661 | if (zone_end < cur->start) | |
662 | break; | |
663 | if (zone_end < cur->end) | |
664 | ext->end = cur->end; | |
665 | list_del(&cur->hook); | |
666 | kfree(cur); | |
667 | } | |
b788db79 | 668 | } |
846705de RW |
669 | |
670 | return 0; | |
b788db79 RW |
671 | } |
672 | ||
673 | /** | |
ef96f639 RW |
674 | * memory_bm_create - Allocate memory for a memory bitmap. |
675 | */ | |
efd5a852 RW |
676 | static int memory_bm_create(struct memory_bitmap *bm, gfp_t gfp_mask, |
677 | int safe_needed) | |
b788db79 RW |
678 | { |
679 | struct chain_allocator ca; | |
846705de RW |
680 | struct list_head mem_extents; |
681 | struct mem_extent *ext; | |
682 | int error; | |
b788db79 RW |
683 | |
684 | chain_init(&ca, gfp_mask, safe_needed); | |
f469f02d | 685 | INIT_LIST_HEAD(&bm->zones); |
b788db79 | 686 | |
846705de RW |
687 | error = create_mem_extents(&mem_extents, gfp_mask); |
688 | if (error) | |
689 | return error; | |
b788db79 | 690 | |
846705de | 691 | list_for_each_entry(ext, &mem_extents, hook) { |
f469f02d | 692 | struct mem_zone_bm_rtree *zone; |
f469f02d JR |
693 | |
694 | zone = create_zone_bm_rtree(gfp_mask, safe_needed, &ca, | |
695 | ext->start, ext->end); | |
9047eb62 JR |
696 | if (!zone) { |
697 | error = -ENOMEM; | |
f469f02d | 698 | goto Error; |
9047eb62 | 699 | } |
f469f02d | 700 | list_add_tail(&zone->list, &bm->zones); |
b788db79 | 701 | } |
846705de | 702 | |
b788db79 RW |
703 | bm->p_list = ca.chain; |
704 | memory_bm_position_reset(bm); | |
846705de RW |
705 | Exit: |
706 | free_mem_extents(&mem_extents); | |
707 | return error; | |
b788db79 | 708 | |
846705de | 709 | Error: |
b788db79 RW |
710 | bm->p_list = ca.chain; |
711 | memory_bm_free(bm, PG_UNSAFE_CLEAR); | |
846705de | 712 | goto Exit; |
b788db79 RW |
713 | } |
714 | ||
715 | /** | |
ef96f639 RW |
716 | * memory_bm_free - Free memory occupied by the memory bitmap. |
717 | * @bm: Memory bitmap. | |
718 | */ | |
b788db79 RW |
719 | static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free) |
720 | { | |
f469f02d | 721 | struct mem_zone_bm_rtree *zone; |
b788db79 | 722 | |
f469f02d JR |
723 | list_for_each_entry(zone, &bm->zones, list) |
724 | free_zone_bm_rtree(zone, clear_nosave_free); | |
725 | ||
b788db79 | 726 | free_list_of_pages(bm->p_list, clear_nosave_free); |
846705de | 727 | |
f469f02d | 728 | INIT_LIST_HEAD(&bm->zones); |
b788db79 RW |
729 | } |
730 | ||
731 | /** | |
ef96f639 | 732 | * memory_bm_find_bit - Find the bit for a given PFN in a memory bitmap. |
07a33823 | 733 | * |
ef96f639 RW |
734 | * Find the bit in memory bitmap @bm that corresponds to the given PFN. |
735 | * The cur.zone, cur.block and cur.node_pfn members of @bm are updated. | |
736 | * | |
737 | * Walk the radix tree to find the page containing the bit that represents @pfn | |
738 | * and return the position of the bit in @addr and @bit_nr. | |
07a33823 | 739 | */ |
9047eb62 JR |
740 | static int memory_bm_find_bit(struct memory_bitmap *bm, unsigned long pfn, |
741 | void **addr, unsigned int *bit_nr) | |
07a33823 JR |
742 | { |
743 | struct mem_zone_bm_rtree *curr, *zone; | |
744 | struct rtree_node *node; | |
745 | int i, block_nr; | |
746 | ||
3a20cb17 JR |
747 | zone = bm->cur.zone; |
748 | ||
749 | if (pfn >= zone->start_pfn && pfn < zone->end_pfn) | |
750 | goto zone_found; | |
751 | ||
07a33823 JR |
752 | zone = NULL; |
753 | ||
754 | /* Find the right zone */ | |
755 | list_for_each_entry(curr, &bm->zones, list) { | |
756 | if (pfn >= curr->start_pfn && pfn < curr->end_pfn) { | |
757 | zone = curr; | |
758 | break; | |
759 | } | |
760 | } | |
761 | ||
762 | if (!zone) | |
763 | return -EFAULT; | |
764 | ||
3a20cb17 | 765 | zone_found: |
07a33823 | 766 | /* |
ef96f639 RW |
767 | * We have found the zone. Now walk the radix tree to find the leaf node |
768 | * for our PFN. | |
07a33823 | 769 | */ |
da6043fe AW |
770 | |
771 | /* | |
7b7b8a2c | 772 | * If the zone we wish to scan is the current zone and the |
da6043fe AW |
773 | * pfn falls into the current node then we do not need to walk |
774 | * the tree. | |
775 | */ | |
3a20cb17 | 776 | node = bm->cur.node; |
da6043fe AW |
777 | if (zone == bm->cur.zone && |
778 | ((pfn - zone->start_pfn) & ~BM_BLOCK_MASK) == bm->cur.node_pfn) | |
3a20cb17 JR |
779 | goto node_found; |
780 | ||
07a33823 JR |
781 | node = zone->rtree; |
782 | block_nr = (pfn - zone->start_pfn) >> BM_BLOCK_SHIFT; | |
783 | ||
784 | for (i = zone->levels; i > 0; i--) { | |
785 | int index; | |
786 | ||
787 | index = block_nr >> ((i - 1) * BM_RTREE_LEVEL_SHIFT); | |
788 | index &= BM_RTREE_LEVEL_MASK; | |
789 | BUG_ON(node->data[index] == 0); | |
790 | node = (struct rtree_node *)node->data[index]; | |
791 | } | |
792 | ||
3a20cb17 JR |
793 | node_found: |
794 | /* Update last position */ | |
795 | bm->cur.zone = zone; | |
796 | bm->cur.node = node; | |
797 | bm->cur.node_pfn = (pfn - zone->start_pfn) & ~BM_BLOCK_MASK; | |
798 | ||
07a33823 JR |
799 | /* Set return values */ |
800 | *addr = node->data; | |
801 | *bit_nr = (pfn - zone->start_pfn) & BM_BLOCK_MASK; | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
74dfd666 RW |
806 | static void memory_bm_set_bit(struct memory_bitmap *bm, unsigned long pfn) |
807 | { | |
808 | void *addr; | |
809 | unsigned int bit; | |
a82f7119 | 810 | int error; |
74dfd666 | 811 | |
a82f7119 RW |
812 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
813 | BUG_ON(error); | |
74dfd666 RW |
814 | set_bit(bit, addr); |
815 | } | |
816 | ||
a82f7119 RW |
817 | static int mem_bm_set_bit_check(struct memory_bitmap *bm, unsigned long pfn) |
818 | { | |
819 | void *addr; | |
820 | unsigned int bit; | |
821 | int error; | |
822 | ||
823 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); | |
07a33823 JR |
824 | if (!error) |
825 | set_bit(bit, addr); | |
826 | ||
a82f7119 RW |
827 | return error; |
828 | } | |
829 | ||
74dfd666 RW |
830 | static void memory_bm_clear_bit(struct memory_bitmap *bm, unsigned long pfn) |
831 | { | |
832 | void *addr; | |
833 | unsigned int bit; | |
a82f7119 | 834 | int error; |
74dfd666 | 835 | |
a82f7119 RW |
836 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
837 | BUG_ON(error); | |
74dfd666 RW |
838 | clear_bit(bit, addr); |
839 | } | |
840 | ||
fdd64ed5 JR |
841 | static void memory_bm_clear_current(struct memory_bitmap *bm) |
842 | { | |
843 | int bit; | |
844 | ||
845 | bit = max(bm->cur.node_bit - 1, 0); | |
846 | clear_bit(bit, bm->cur.node->data); | |
847 | } | |
848 | ||
74dfd666 RW |
849 | static int memory_bm_test_bit(struct memory_bitmap *bm, unsigned long pfn) |
850 | { | |
851 | void *addr; | |
852 | unsigned int bit; | |
9047eb62 | 853 | int error; |
74dfd666 | 854 | |
a82f7119 RW |
855 | error = memory_bm_find_bit(bm, pfn, &addr, &bit); |
856 | BUG_ON(error); | |
9047eb62 | 857 | return test_bit(bit, addr); |
b788db79 RW |
858 | } |
859 | ||
69643279 RW |
860 | static bool memory_bm_pfn_present(struct memory_bitmap *bm, unsigned long pfn) |
861 | { | |
862 | void *addr; | |
863 | unsigned int bit; | |
07a33823 | 864 | |
9047eb62 | 865 | return !memory_bm_find_bit(bm, pfn, &addr, &bit); |
b788db79 RW |
866 | } |
867 | ||
3a20cb17 | 868 | /* |
ef96f639 | 869 | * rtree_next_node - Jump to the next leaf node. |
3a20cb17 | 870 | * |
ef96f639 RW |
871 | * Set the position to the beginning of the next node in the |
872 | * memory bitmap. This is either the next node in the current | |
873 | * zone's radix tree or the first node in the radix tree of the | |
874 | * next zone. | |
3a20cb17 | 875 | * |
ef96f639 | 876 | * Return true if there is a next node, false otherwise. |
3a20cb17 JR |
877 | */ |
878 | static bool rtree_next_node(struct memory_bitmap *bm) | |
879 | { | |
924d8696 JM |
880 | if (!list_is_last(&bm->cur.node->list, &bm->cur.zone->leaves)) { |
881 | bm->cur.node = list_entry(bm->cur.node->list.next, | |
882 | struct rtree_node, list); | |
3a20cb17 JR |
883 | bm->cur.node_pfn += BM_BITS_PER_BLOCK; |
884 | bm->cur.node_bit = 0; | |
0f7d83e8 | 885 | touch_softlockup_watchdog(); |
3a20cb17 JR |
886 | return true; |
887 | } | |
888 | ||
889 | /* No more nodes, goto next zone */ | |
924d8696 JM |
890 | if (!list_is_last(&bm->cur.zone->list, &bm->zones)) { |
891 | bm->cur.zone = list_entry(bm->cur.zone->list.next, | |
3a20cb17 | 892 | struct mem_zone_bm_rtree, list); |
3a20cb17 JR |
893 | bm->cur.node = list_entry(bm->cur.zone->leaves.next, |
894 | struct rtree_node, list); | |
895 | bm->cur.node_pfn = 0; | |
896 | bm->cur.node_bit = 0; | |
897 | return true; | |
898 | } | |
899 | ||
900 | /* No more zones */ | |
901 | return false; | |
902 | } | |
903 | ||
9047eb62 | 904 | /** |
ef96f639 RW |
905 | * memory_bm_rtree_next_pfn - Find the next set bit in a memory bitmap. |
906 | * @bm: Memory bitmap. | |
3a20cb17 | 907 | * |
ef96f639 RW |
908 | * Starting from the last returned position this function searches for the next |
909 | * set bit in @bm and returns the PFN represented by it. If no more bits are | |
910 | * set, BM_END_OF_MAP is returned. | |
9047eb62 | 911 | * |
ef96f639 RW |
912 | * It is required to run memory_bm_position_reset() before the first call to |
913 | * this function for the given memory bitmap. | |
3a20cb17 | 914 | */ |
9047eb62 | 915 | static unsigned long memory_bm_next_pfn(struct memory_bitmap *bm) |
3a20cb17 JR |
916 | { |
917 | unsigned long bits, pfn, pages; | |
918 | int bit; | |
919 | ||
920 | do { | |
921 | pages = bm->cur.zone->end_pfn - bm->cur.zone->start_pfn; | |
922 | bits = min(pages - bm->cur.node_pfn, BM_BITS_PER_BLOCK); | |
923 | bit = find_next_bit(bm->cur.node->data, bits, | |
924 | bm->cur.node_bit); | |
925 | if (bit < bits) { | |
926 | pfn = bm->cur.zone->start_pfn + bm->cur.node_pfn + bit; | |
927 | bm->cur.node_bit = bit + 1; | |
928 | return pfn; | |
929 | } | |
930 | } while (rtree_next_node(bm)); | |
931 | ||
932 | return BM_END_OF_MAP; | |
933 | } | |
934 | ||
ef96f639 RW |
935 | /* |
936 | * This structure represents a range of page frames the contents of which | |
937 | * should not be saved during hibernation. | |
74dfd666 | 938 | */ |
74dfd666 RW |
939 | struct nosave_region { |
940 | struct list_head list; | |
941 | unsigned long start_pfn; | |
942 | unsigned long end_pfn; | |
943 | }; | |
944 | ||
945 | static LIST_HEAD(nosave_regions); | |
946 | ||
307c5971 RW |
947 | static void recycle_zone_bm_rtree(struct mem_zone_bm_rtree *zone) |
948 | { | |
949 | struct rtree_node *node; | |
950 | ||
951 | list_for_each_entry(node, &zone->nodes, list) | |
952 | recycle_safe_page(node->data); | |
953 | ||
954 | list_for_each_entry(node, &zone->leaves, list) | |
955 | recycle_safe_page(node->data); | |
956 | } | |
957 | ||
958 | static void memory_bm_recycle(struct memory_bitmap *bm) | |
959 | { | |
960 | struct mem_zone_bm_rtree *zone; | |
961 | struct linked_page *p_list; | |
962 | ||
963 | list_for_each_entry(zone, &bm->zones, list) | |
964 | recycle_zone_bm_rtree(zone); | |
965 | ||
966 | p_list = bm->p_list; | |
967 | while (p_list) { | |
968 | struct linked_page *lp = p_list; | |
969 | ||
970 | p_list = lp->next; | |
971 | recycle_safe_page(lp); | |
972 | } | |
973 | } | |
974 | ||
74dfd666 | 975 | /** |
ef96f639 RW |
976 | * register_nosave_region - Register a region of unsaveable memory. |
977 | * | |
978 | * Register a range of page frames the contents of which should not be saved | |
979 | * during hibernation (to be used in the early initialization code). | |
74dfd666 | 980 | */ |
efd5a852 RW |
981 | void __init __register_nosave_region(unsigned long start_pfn, |
982 | unsigned long end_pfn, int use_kmalloc) | |
74dfd666 RW |
983 | { |
984 | struct nosave_region *region; | |
985 | ||
986 | if (start_pfn >= end_pfn) | |
987 | return; | |
988 | ||
989 | if (!list_empty(&nosave_regions)) { | |
990 | /* Try to extend the previous region (they should be sorted) */ | |
991 | region = list_entry(nosave_regions.prev, | |
992 | struct nosave_region, list); | |
993 | if (region->end_pfn == start_pfn) { | |
994 | region->end_pfn = end_pfn; | |
995 | goto Report; | |
996 | } | |
997 | } | |
940d67f6 | 998 | if (use_kmalloc) { |
ef96f639 | 999 | /* During init, this shouldn't fail */ |
940d67f6 JB |
1000 | region = kmalloc(sizeof(struct nosave_region), GFP_KERNEL); |
1001 | BUG_ON(!region); | |
d5f32af3 | 1002 | } else { |
940d67f6 | 1003 | /* This allocation cannot fail */ |
7e1c4e27 MR |
1004 | region = memblock_alloc(sizeof(struct nosave_region), |
1005 | SMP_CACHE_BYTES); | |
8a7f97b9 MR |
1006 | if (!region) |
1007 | panic("%s: Failed to allocate %zu bytes\n", __func__, | |
1008 | sizeof(struct nosave_region)); | |
d5f32af3 | 1009 | } |
74dfd666 RW |
1010 | region->start_pfn = start_pfn; |
1011 | region->end_pfn = end_pfn; | |
1012 | list_add_tail(®ion->list, &nosave_regions); | |
1013 | Report: | |
64ec72a1 | 1014 | pr_info("Registered nosave memory: [mem %#010llx-%#010llx]\n", |
cd38ca85 BH |
1015 | (unsigned long long) start_pfn << PAGE_SHIFT, |
1016 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
74dfd666 RW |
1017 | } |
1018 | ||
1019 | /* | |
1020 | * Set bits in this map correspond to the page frames the contents of which | |
1021 | * should not be saved during the suspend. | |
1022 | */ | |
1023 | static struct memory_bitmap *forbidden_pages_map; | |
1024 | ||
1025 | /* Set bits in this map correspond to free page frames. */ | |
1026 | static struct memory_bitmap *free_pages_map; | |
1027 | ||
1028 | /* | |
1029 | * Each page frame allocated for creating the image is marked by setting the | |
1030 | * corresponding bits in forbidden_pages_map and free_pages_map simultaneously | |
1031 | */ | |
1032 | ||
1033 | void swsusp_set_page_free(struct page *page) | |
1034 | { | |
1035 | if (free_pages_map) | |
1036 | memory_bm_set_bit(free_pages_map, page_to_pfn(page)); | |
1037 | } | |
1038 | ||
1039 | static int swsusp_page_is_free(struct page *page) | |
1040 | { | |
1041 | return free_pages_map ? | |
1042 | memory_bm_test_bit(free_pages_map, page_to_pfn(page)) : 0; | |
1043 | } | |
1044 | ||
1045 | void swsusp_unset_page_free(struct page *page) | |
1046 | { | |
1047 | if (free_pages_map) | |
1048 | memory_bm_clear_bit(free_pages_map, page_to_pfn(page)); | |
1049 | } | |
1050 | ||
1051 | static void swsusp_set_page_forbidden(struct page *page) | |
1052 | { | |
1053 | if (forbidden_pages_map) | |
1054 | memory_bm_set_bit(forbidden_pages_map, page_to_pfn(page)); | |
1055 | } | |
1056 | ||
1057 | int swsusp_page_is_forbidden(struct page *page) | |
1058 | { | |
1059 | return forbidden_pages_map ? | |
1060 | memory_bm_test_bit(forbidden_pages_map, page_to_pfn(page)) : 0; | |
1061 | } | |
1062 | ||
1063 | static void swsusp_unset_page_forbidden(struct page *page) | |
1064 | { | |
1065 | if (forbidden_pages_map) | |
1066 | memory_bm_clear_bit(forbidden_pages_map, page_to_pfn(page)); | |
1067 | } | |
1068 | ||
1069 | /** | |
ef96f639 RW |
1070 | * mark_nosave_pages - Mark pages that should not be saved. |
1071 | * @bm: Memory bitmap. | |
1072 | * | |
1073 | * Set the bits in @bm that correspond to the page frames the contents of which | |
1074 | * should not be saved. | |
74dfd666 | 1075 | */ |
74dfd666 RW |
1076 | static void mark_nosave_pages(struct memory_bitmap *bm) |
1077 | { | |
1078 | struct nosave_region *region; | |
1079 | ||
1080 | if (list_empty(&nosave_regions)) | |
1081 | return; | |
1082 | ||
1083 | list_for_each_entry(region, &nosave_regions, list) { | |
1084 | unsigned long pfn; | |
1085 | ||
64ec72a1 | 1086 | pr_debug("Marking nosave pages: [mem %#010llx-%#010llx]\n", |
69f1d475 BH |
1087 | (unsigned long long) region->start_pfn << PAGE_SHIFT, |
1088 | ((unsigned long long) region->end_pfn << PAGE_SHIFT) | |
1089 | - 1); | |
74dfd666 RW |
1090 | |
1091 | for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++) | |
a82f7119 RW |
1092 | if (pfn_valid(pfn)) { |
1093 | /* | |
1094 | * It is safe to ignore the result of | |
1095 | * mem_bm_set_bit_check() here, since we won't | |
1096 | * touch the PFNs for which the error is | |
1097 | * returned anyway. | |
1098 | */ | |
1099 | mem_bm_set_bit_check(bm, pfn); | |
1100 | } | |
74dfd666 RW |
1101 | } |
1102 | } | |
1103 | ||
1104 | /** | |
ef96f639 RW |
1105 | * create_basic_memory_bitmaps - Create bitmaps to hold basic page information. |
1106 | * | |
1107 | * Create bitmaps needed for marking page frames that should not be saved and | |
1108 | * free page frames. The forbidden_pages_map and free_pages_map pointers are | |
1109 | * only modified if everything goes well, because we don't want the bits to be | |
1110 | * touched before both bitmaps are set up. | |
74dfd666 | 1111 | */ |
74dfd666 RW |
1112 | int create_basic_memory_bitmaps(void) |
1113 | { | |
1114 | struct memory_bitmap *bm1, *bm2; | |
1115 | int error = 0; | |
1116 | ||
aab17289 RW |
1117 | if (forbidden_pages_map && free_pages_map) |
1118 | return 0; | |
1119 | else | |
1120 | BUG_ON(forbidden_pages_map || free_pages_map); | |
74dfd666 | 1121 | |
0709db60 | 1122 | bm1 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL); |
74dfd666 RW |
1123 | if (!bm1) |
1124 | return -ENOMEM; | |
1125 | ||
0709db60 | 1126 | error = memory_bm_create(bm1, GFP_KERNEL, PG_ANY); |
74dfd666 RW |
1127 | if (error) |
1128 | goto Free_first_object; | |
1129 | ||
0709db60 | 1130 | bm2 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL); |
74dfd666 RW |
1131 | if (!bm2) |
1132 | goto Free_first_bitmap; | |
1133 | ||
0709db60 | 1134 | error = memory_bm_create(bm2, GFP_KERNEL, PG_ANY); |
74dfd666 RW |
1135 | if (error) |
1136 | goto Free_second_object; | |
1137 | ||
1138 | forbidden_pages_map = bm1; | |
1139 | free_pages_map = bm2; | |
1140 | mark_nosave_pages(forbidden_pages_map); | |
1141 | ||
64ec72a1 | 1142 | pr_debug("Basic memory bitmaps created\n"); |
74dfd666 RW |
1143 | |
1144 | return 0; | |
1145 | ||
1146 | Free_second_object: | |
1147 | kfree(bm2); | |
1148 | Free_first_bitmap: | |
1149 | memory_bm_free(bm1, PG_UNSAFE_CLEAR); | |
1150 | Free_first_object: | |
1151 | kfree(bm1); | |
1152 | return -ENOMEM; | |
1153 | } | |
1154 | ||
1155 | /** | |
ef96f639 RW |
1156 | * free_basic_memory_bitmaps - Free memory bitmaps holding basic information. |
1157 | * | |
1158 | * Free memory bitmaps allocated by create_basic_memory_bitmaps(). The | |
1159 | * auxiliary pointers are necessary so that the bitmaps themselves are not | |
1160 | * referred to while they are being freed. | |
74dfd666 | 1161 | */ |
74dfd666 RW |
1162 | void free_basic_memory_bitmaps(void) |
1163 | { | |
1164 | struct memory_bitmap *bm1, *bm2; | |
1165 | ||
6a0c7cd3 RW |
1166 | if (WARN_ON(!(forbidden_pages_map && free_pages_map))) |
1167 | return; | |
74dfd666 RW |
1168 | |
1169 | bm1 = forbidden_pages_map; | |
1170 | bm2 = free_pages_map; | |
1171 | forbidden_pages_map = NULL; | |
1172 | free_pages_map = NULL; | |
1173 | memory_bm_free(bm1, PG_UNSAFE_CLEAR); | |
1174 | kfree(bm1); | |
1175 | memory_bm_free(bm2, PG_UNSAFE_CLEAR); | |
1176 | kfree(bm2); | |
1177 | ||
64ec72a1 | 1178 | pr_debug("Basic memory bitmaps freed\n"); |
74dfd666 RW |
1179 | } |
1180 | ||
03b6c9a3 VB |
1181 | static void clear_or_poison_free_page(struct page *page) |
1182 | { | |
1183 | if (page_poisoning_enabled_static()) | |
1184 | __kernel_poison_pages(page, 1); | |
1185 | else if (want_init_on_free()) | |
1186 | clear_highpage(page); | |
1187 | } | |
1188 | ||
1189 | void clear_or_poison_free_pages(void) | |
1ad1410f | 1190 | { |
1ad1410f AA |
1191 | struct memory_bitmap *bm = free_pages_map; |
1192 | unsigned long pfn; | |
1193 | ||
1194 | if (WARN_ON(!(free_pages_map))) | |
1195 | return; | |
1196 | ||
03b6c9a3 | 1197 | if (page_poisoning_enabled() || want_init_on_free()) { |
18451f9f | 1198 | memory_bm_position_reset(bm); |
1ad1410f | 1199 | pfn = memory_bm_next_pfn(bm); |
18451f9f AP |
1200 | while (pfn != BM_END_OF_MAP) { |
1201 | if (pfn_valid(pfn)) | |
03b6c9a3 | 1202 | clear_or_poison_free_page(pfn_to_page(pfn)); |
18451f9f AP |
1203 | |
1204 | pfn = memory_bm_next_pfn(bm); | |
1205 | } | |
1206 | memory_bm_position_reset(bm); | |
1207 | pr_info("free pages cleared after restore\n"); | |
1ad1410f | 1208 | } |
1ad1410f AA |
1209 | } |
1210 | ||
b788db79 | 1211 | /** |
ef96f639 RW |
1212 | * snapshot_additional_pages - Estimate the number of extra pages needed. |
1213 | * @zone: Memory zone to carry out the computation for. | |
1214 | * | |
1215 | * Estimate the number of additional pages needed for setting up a hibernation | |
1216 | * image data structures for @zone (usually, the returned value is greater than | |
1217 | * the exact number). | |
b788db79 | 1218 | */ |
b788db79 RW |
1219 | unsigned int snapshot_additional_pages(struct zone *zone) |
1220 | { | |
f469f02d | 1221 | unsigned int rtree, nodes; |
b788db79 | 1222 | |
f469f02d JR |
1223 | rtree = nodes = DIV_ROUND_UP(zone->spanned_pages, BM_BITS_PER_BLOCK); |
1224 | rtree += DIV_ROUND_UP(rtree * sizeof(struct rtree_node), | |
1225 | LINKED_PAGE_DATA_SIZE); | |
1226 | while (nodes > 1) { | |
1227 | nodes = DIV_ROUND_UP(nodes, BM_ENTRIES_PER_LEVEL); | |
1228 | rtree += nodes; | |
1229 | } | |
1230 | ||
9047eb62 | 1231 | return 2 * rtree; |
b788db79 RW |
1232 | } |
1233 | ||
8357376d RW |
1234 | #ifdef CONFIG_HIGHMEM |
1235 | /** | |
ef96f639 RW |
1236 | * count_free_highmem_pages - Compute the total number of free highmem pages. |
1237 | * | |
1238 | * The returned number is system-wide. | |
8357376d | 1239 | */ |
8357376d RW |
1240 | static unsigned int count_free_highmem_pages(void) |
1241 | { | |
1242 | struct zone *zone; | |
1243 | unsigned int cnt = 0; | |
1244 | ||
ee99c71c KM |
1245 | for_each_populated_zone(zone) |
1246 | if (is_highmem(zone)) | |
d23ad423 | 1247 | cnt += zone_page_state(zone, NR_FREE_PAGES); |
8357376d RW |
1248 | |
1249 | return cnt; | |
1250 | } | |
1251 | ||
1252 | /** | |
ef96f639 RW |
1253 | * saveable_highmem_page - Check if a highmem page is saveable. |
1254 | * | |
1255 | * Determine whether a highmem page should be included in a hibernation image. | |
8357376d | 1256 | * |
ef96f639 RW |
1257 | * We should save the page if it isn't Nosave or NosaveFree, or Reserved, |
1258 | * and it isn't part of a free chunk of pages. | |
8357376d | 1259 | */ |
846705de | 1260 | static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn) |
8357376d RW |
1261 | { |
1262 | struct page *page; | |
1263 | ||
1264 | if (!pfn_valid(pfn)) | |
1265 | return NULL; | |
1266 | ||
5b56db37 DH |
1267 | page = pfn_to_online_page(pfn); |
1268 | if (!page || page_zone(page) != zone) | |
846705de | 1269 | return NULL; |
8357376d RW |
1270 | |
1271 | BUG_ON(!PageHighMem(page)); | |
1272 | ||
abd02ac6 DH |
1273 | if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page)) |
1274 | return NULL; | |
1275 | ||
1276 | if (PageReserved(page) || PageOffline(page)) | |
8357376d RW |
1277 | return NULL; |
1278 | ||
c6968e73 SG |
1279 | if (page_is_guard(page)) |
1280 | return NULL; | |
1281 | ||
8357376d RW |
1282 | return page; |
1283 | } | |
1284 | ||
1285 | /** | |
ef96f639 | 1286 | * count_highmem_pages - Compute the total number of saveable highmem pages. |
8357376d | 1287 | */ |
fe419535 | 1288 | static unsigned int count_highmem_pages(void) |
8357376d RW |
1289 | { |
1290 | struct zone *zone; | |
1291 | unsigned int n = 0; | |
1292 | ||
98e73dc5 | 1293 | for_each_populated_zone(zone) { |
8357376d RW |
1294 | unsigned long pfn, max_zone_pfn; |
1295 | ||
1296 | if (!is_highmem(zone)) | |
1297 | continue; | |
1298 | ||
1299 | mark_free_pages(zone); | |
c33bc315 | 1300 | max_zone_pfn = zone_end_pfn(zone); |
8357376d | 1301 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
846705de | 1302 | if (saveable_highmem_page(zone, pfn)) |
8357376d RW |
1303 | n++; |
1304 | } | |
1305 | return n; | |
1306 | } | |
1307 | #else | |
846705de RW |
1308 | static inline void *saveable_highmem_page(struct zone *z, unsigned long p) |
1309 | { | |
1310 | return NULL; | |
1311 | } | |
8357376d RW |
1312 | #endif /* CONFIG_HIGHMEM */ |
1313 | ||
25761b6e | 1314 | /** |
ef96f639 RW |
1315 | * saveable_page - Check if the given page is saveable. |
1316 | * | |
1317 | * Determine whether a non-highmem page should be included in a hibernation | |
1318 | * image. | |
25761b6e | 1319 | * |
ef96f639 RW |
1320 | * We should save the page if it isn't Nosave, and is not in the range |
1321 | * of pages statically defined as 'unsaveable', and it isn't part of | |
1322 | * a free chunk of pages. | |
25761b6e | 1323 | */ |
846705de | 1324 | static struct page *saveable_page(struct zone *zone, unsigned long pfn) |
25761b6e | 1325 | { |
de491861 | 1326 | struct page *page; |
25761b6e RW |
1327 | |
1328 | if (!pfn_valid(pfn)) | |
ae83c5ee | 1329 | return NULL; |
25761b6e | 1330 | |
5b56db37 DH |
1331 | page = pfn_to_online_page(pfn); |
1332 | if (!page || page_zone(page) != zone) | |
846705de | 1333 | return NULL; |
ae83c5ee | 1334 | |
8357376d RW |
1335 | BUG_ON(PageHighMem(page)); |
1336 | ||
7be98234 | 1337 | if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page)) |
ae83c5ee | 1338 | return NULL; |
8357376d | 1339 | |
abd02ac6 DH |
1340 | if (PageOffline(page)) |
1341 | return NULL; | |
1342 | ||
8a235efa RW |
1343 | if (PageReserved(page) |
1344 | && (!kernel_page_present(page) || pfn_is_nosave(pfn))) | |
ae83c5ee | 1345 | return NULL; |
25761b6e | 1346 | |
c6968e73 SG |
1347 | if (page_is_guard(page)) |
1348 | return NULL; | |
1349 | ||
ae83c5ee | 1350 | return page; |
25761b6e RW |
1351 | } |
1352 | ||
8357376d | 1353 | /** |
ef96f639 | 1354 | * count_data_pages - Compute the total number of saveable non-highmem pages. |
8357376d | 1355 | */ |
fe419535 | 1356 | static unsigned int count_data_pages(void) |
25761b6e RW |
1357 | { |
1358 | struct zone *zone; | |
ae83c5ee | 1359 | unsigned long pfn, max_zone_pfn; |
dc19d507 | 1360 | unsigned int n = 0; |
25761b6e | 1361 | |
98e73dc5 | 1362 | for_each_populated_zone(zone) { |
25761b6e RW |
1363 | if (is_highmem(zone)) |
1364 | continue; | |
8357376d | 1365 | |
25761b6e | 1366 | mark_free_pages(zone); |
c33bc315 | 1367 | max_zone_pfn = zone_end_pfn(zone); |
ae83c5ee | 1368 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
846705de | 1369 | if (saveable_page(zone, pfn)) |
8357376d | 1370 | n++; |
25761b6e | 1371 | } |
a0f49651 | 1372 | return n; |
25761b6e RW |
1373 | } |
1374 | ||
ef96f639 RW |
1375 | /* |
1376 | * This is needed, because copy_page and memcpy are not usable for copying | |
8357376d RW |
1377 | * task structs. |
1378 | */ | |
1379 | static inline void do_copy_page(long *dst, long *src) | |
f623f0db RW |
1380 | { |
1381 | int n; | |
1382 | ||
f623f0db RW |
1383 | for (n = PAGE_SIZE / sizeof(long); n; n--) |
1384 | *dst++ = *src++; | |
1385 | } | |
1386 | ||
8a235efa | 1387 | /** |
ef96f639 RW |
1388 | * safe_copy_page - Copy a page in a safe way. |
1389 | * | |
1390 | * Check if the page we are going to copy is marked as present in the kernel | |
d6332692 RE |
1391 | * page tables. This always is the case if CONFIG_DEBUG_PAGEALLOC or |
1392 | * CONFIG_ARCH_HAS_SET_DIRECT_MAP is not set. In that case kernel_page_present() | |
1393 | * always returns 'true'. | |
8a235efa RW |
1394 | */ |
1395 | static void safe_copy_page(void *dst, struct page *s_page) | |
1396 | { | |
1397 | if (kernel_page_present(s_page)) { | |
1398 | do_copy_page(dst, page_address(s_page)); | |
1399 | } else { | |
2abf962a | 1400 | hibernate_map_page(s_page); |
8a235efa | 1401 | do_copy_page(dst, page_address(s_page)); |
2abf962a | 1402 | hibernate_unmap_page(s_page); |
8a235efa RW |
1403 | } |
1404 | } | |
1405 | ||
8357376d | 1406 | #ifdef CONFIG_HIGHMEM |
efd5a852 | 1407 | static inline struct page *page_is_saveable(struct zone *zone, unsigned long pfn) |
8357376d RW |
1408 | { |
1409 | return is_highmem(zone) ? | |
846705de | 1410 | saveable_highmem_page(zone, pfn) : saveable_page(zone, pfn); |
8357376d RW |
1411 | } |
1412 | ||
8a235efa | 1413 | static void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn) |
8357376d RW |
1414 | { |
1415 | struct page *s_page, *d_page; | |
1416 | void *src, *dst; | |
1417 | ||
1418 | s_page = pfn_to_page(src_pfn); | |
1419 | d_page = pfn_to_page(dst_pfn); | |
1420 | if (PageHighMem(s_page)) { | |
0de9a1e2 CW |
1421 | src = kmap_atomic(s_page); |
1422 | dst = kmap_atomic(d_page); | |
8357376d | 1423 | do_copy_page(dst, src); |
0de9a1e2 CW |
1424 | kunmap_atomic(dst); |
1425 | kunmap_atomic(src); | |
8357376d | 1426 | } else { |
8357376d | 1427 | if (PageHighMem(d_page)) { |
ef96f639 RW |
1428 | /* |
1429 | * The page pointed to by src may contain some kernel | |
8357376d RW |
1430 | * data modified by kmap_atomic() |
1431 | */ | |
8a235efa | 1432 | safe_copy_page(buffer, s_page); |
0de9a1e2 | 1433 | dst = kmap_atomic(d_page); |
3ecb01df | 1434 | copy_page(dst, buffer); |
0de9a1e2 | 1435 | kunmap_atomic(dst); |
8357376d | 1436 | } else { |
8a235efa | 1437 | safe_copy_page(page_address(d_page), s_page); |
8357376d RW |
1438 | } |
1439 | } | |
1440 | } | |
1441 | #else | |
846705de | 1442 | #define page_is_saveable(zone, pfn) saveable_page(zone, pfn) |
8357376d | 1443 | |
8a235efa | 1444 | static inline void copy_data_page(unsigned long dst_pfn, unsigned long src_pfn) |
8357376d | 1445 | { |
8a235efa RW |
1446 | safe_copy_page(page_address(pfn_to_page(dst_pfn)), |
1447 | pfn_to_page(src_pfn)); | |
8357376d RW |
1448 | } |
1449 | #endif /* CONFIG_HIGHMEM */ | |
1450 | ||
efd5a852 RW |
1451 | static void copy_data_pages(struct memory_bitmap *copy_bm, |
1452 | struct memory_bitmap *orig_bm) | |
25761b6e RW |
1453 | { |
1454 | struct zone *zone; | |
b788db79 | 1455 | unsigned long pfn; |
25761b6e | 1456 | |
98e73dc5 | 1457 | for_each_populated_zone(zone) { |
b788db79 RW |
1458 | unsigned long max_zone_pfn; |
1459 | ||
25761b6e | 1460 | mark_free_pages(zone); |
c33bc315 | 1461 | max_zone_pfn = zone_end_pfn(zone); |
b788db79 | 1462 | for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) |
8357376d | 1463 | if (page_is_saveable(zone, pfn)) |
b788db79 | 1464 | memory_bm_set_bit(orig_bm, pfn); |
25761b6e | 1465 | } |
b788db79 RW |
1466 | memory_bm_position_reset(orig_bm); |
1467 | memory_bm_position_reset(copy_bm); | |
df7c4872 | 1468 | for(;;) { |
b788db79 | 1469 | pfn = memory_bm_next_pfn(orig_bm); |
df7c4872 FW |
1470 | if (unlikely(pfn == BM_END_OF_MAP)) |
1471 | break; | |
1472 | copy_data_page(memory_bm_next_pfn(copy_bm), pfn); | |
1473 | } | |
25761b6e RW |
1474 | } |
1475 | ||
8357376d RW |
1476 | /* Total number of image pages */ |
1477 | static unsigned int nr_copy_pages; | |
1478 | /* Number of pages needed for saving the original pfns of the image pages */ | |
1479 | static unsigned int nr_meta_pages; | |
64a473cb RW |
1480 | /* |
1481 | * Numbers of normal and highmem page frames allocated for hibernation image | |
1482 | * before suspending devices. | |
1483 | */ | |
0bae5fd3 | 1484 | static unsigned int alloc_normal, alloc_highmem; |
64a473cb RW |
1485 | /* |
1486 | * Memory bitmap used for marking saveable pages (during hibernation) or | |
1487 | * hibernation image pages (during restore) | |
1488 | */ | |
1489 | static struct memory_bitmap orig_bm; | |
1490 | /* | |
1491 | * Memory bitmap used during hibernation for marking allocated page frames that | |
1492 | * will contain copies of saveable pages. During restore it is initially used | |
1493 | * for marking hibernation image pages, but then the set bits from it are | |
1494 | * duplicated in @orig_bm and it is released. On highmem systems it is next | |
1495 | * used for marking "safe" highmem pages, but it has to be reinitialized for | |
1496 | * this purpose. | |
1497 | */ | |
1498 | static struct memory_bitmap copy_bm; | |
8357376d | 1499 | |
25761b6e | 1500 | /** |
ef96f639 | 1501 | * swsusp_free - Free pages allocated for hibernation image. |
cd560bb2 | 1502 | * |
ef96f639 RW |
1503 | * Image pages are alocated before snapshot creation, so they need to be |
1504 | * released after resume. | |
25761b6e | 1505 | */ |
25761b6e RW |
1506 | void swsusp_free(void) |
1507 | { | |
fdd64ed5 | 1508 | unsigned long fb_pfn, fr_pfn; |
6efde38f | 1509 | |
fdd64ed5 JR |
1510 | if (!forbidden_pages_map || !free_pages_map) |
1511 | goto out; | |
1512 | ||
1513 | memory_bm_position_reset(forbidden_pages_map); | |
1514 | memory_bm_position_reset(free_pages_map); | |
1515 | ||
1516 | loop: | |
1517 | fr_pfn = memory_bm_next_pfn(free_pages_map); | |
1518 | fb_pfn = memory_bm_next_pfn(forbidden_pages_map); | |
1519 | ||
1520 | /* | |
1521 | * Find the next bit set in both bitmaps. This is guaranteed to | |
1522 | * terminate when fb_pfn == fr_pfn == BM_END_OF_MAP. | |
1523 | */ | |
1524 | do { | |
1525 | if (fb_pfn < fr_pfn) | |
1526 | fb_pfn = memory_bm_next_pfn(forbidden_pages_map); | |
1527 | if (fr_pfn < fb_pfn) | |
1528 | fr_pfn = memory_bm_next_pfn(free_pages_map); | |
1529 | } while (fb_pfn != fr_pfn); | |
1530 | ||
1531 | if (fr_pfn != BM_END_OF_MAP && pfn_valid(fr_pfn)) { | |
1532 | struct page *page = pfn_to_page(fr_pfn); | |
1533 | ||
1534 | memory_bm_clear_current(forbidden_pages_map); | |
1535 | memory_bm_clear_current(free_pages_map); | |
4c0b6c10 | 1536 | hibernate_restore_unprotect_page(page_address(page)); |
fdd64ed5 JR |
1537 | __free_page(page); |
1538 | goto loop; | |
25761b6e | 1539 | } |
fdd64ed5 JR |
1540 | |
1541 | out: | |
f577eb30 RW |
1542 | nr_copy_pages = 0; |
1543 | nr_meta_pages = 0; | |
75534b50 | 1544 | restore_pblist = NULL; |
6e1819d6 | 1545 | buffer = NULL; |
64a473cb RW |
1546 | alloc_normal = 0; |
1547 | alloc_highmem = 0; | |
4c0b6c10 | 1548 | hibernate_restore_protection_end(); |
25761b6e RW |
1549 | } |
1550 | ||
4bb33435 RW |
1551 | /* Helper functions used for the shrinking of memory. */ |
1552 | ||
1553 | #define GFP_IMAGE (GFP_KERNEL | __GFP_NOWARN) | |
1554 | ||
fe419535 | 1555 | /** |
ef96f639 | 1556 | * preallocate_image_pages - Allocate a number of pages for hibernation image. |
4bb33435 RW |
1557 | * @nr_pages: Number of page frames to allocate. |
1558 | * @mask: GFP flags to use for the allocation. | |
fe419535 | 1559 | * |
4bb33435 RW |
1560 | * Return value: Number of page frames actually allocated |
1561 | */ | |
1562 | static unsigned long preallocate_image_pages(unsigned long nr_pages, gfp_t mask) | |
1563 | { | |
1564 | unsigned long nr_alloc = 0; | |
1565 | ||
1566 | while (nr_pages > 0) { | |
64a473cb RW |
1567 | struct page *page; |
1568 | ||
1569 | page = alloc_image_page(mask); | |
1570 | if (!page) | |
4bb33435 | 1571 | break; |
64a473cb RW |
1572 | memory_bm_set_bit(©_bm, page_to_pfn(page)); |
1573 | if (PageHighMem(page)) | |
1574 | alloc_highmem++; | |
1575 | else | |
1576 | alloc_normal++; | |
4bb33435 RW |
1577 | nr_pages--; |
1578 | nr_alloc++; | |
1579 | } | |
1580 | ||
1581 | return nr_alloc; | |
1582 | } | |
1583 | ||
6715045d RW |
1584 | static unsigned long preallocate_image_memory(unsigned long nr_pages, |
1585 | unsigned long avail_normal) | |
4bb33435 | 1586 | { |
6715045d RW |
1587 | unsigned long alloc; |
1588 | ||
1589 | if (avail_normal <= alloc_normal) | |
1590 | return 0; | |
1591 | ||
1592 | alloc = avail_normal - alloc_normal; | |
1593 | if (nr_pages < alloc) | |
1594 | alloc = nr_pages; | |
1595 | ||
1596 | return preallocate_image_pages(alloc, GFP_IMAGE); | |
4bb33435 RW |
1597 | } |
1598 | ||
1599 | #ifdef CONFIG_HIGHMEM | |
1600 | static unsigned long preallocate_image_highmem(unsigned long nr_pages) | |
1601 | { | |
1602 | return preallocate_image_pages(nr_pages, GFP_IMAGE | __GFP_HIGHMEM); | |
1603 | } | |
1604 | ||
1605 | /** | |
ef96f639 | 1606 | * __fraction - Compute (an approximation of) x * (multiplier / base). |
fe419535 | 1607 | */ |
4bb33435 RW |
1608 | static unsigned long __fraction(u64 x, u64 multiplier, u64 base) |
1609 | { | |
809ed78a | 1610 | return div64_u64(x * multiplier, base); |
4bb33435 | 1611 | } |
fe419535 | 1612 | |
4bb33435 | 1613 | static unsigned long preallocate_highmem_fraction(unsigned long nr_pages, |
efd5a852 RW |
1614 | unsigned long highmem, |
1615 | unsigned long total) | |
fe419535 | 1616 | { |
4bb33435 RW |
1617 | unsigned long alloc = __fraction(nr_pages, highmem, total); |
1618 | ||
1619 | return preallocate_image_pages(alloc, GFP_IMAGE | __GFP_HIGHMEM); | |
fe419535 | 1620 | } |
4bb33435 RW |
1621 | #else /* CONFIG_HIGHMEM */ |
1622 | static inline unsigned long preallocate_image_highmem(unsigned long nr_pages) | |
1623 | { | |
1624 | return 0; | |
1625 | } | |
1626 | ||
1627 | static inline unsigned long preallocate_highmem_fraction(unsigned long nr_pages, | |
efd5a852 RW |
1628 | unsigned long highmem, |
1629 | unsigned long total) | |
4bb33435 RW |
1630 | { |
1631 | return 0; | |
1632 | } | |
1633 | #endif /* CONFIG_HIGHMEM */ | |
fe419535 | 1634 | |
4bb33435 | 1635 | /** |
ef96f639 | 1636 | * free_unnecessary_pages - Release preallocated pages not needed for the image. |
64a473cb | 1637 | */ |
a64fc82c | 1638 | static unsigned long free_unnecessary_pages(void) |
64a473cb | 1639 | { |
a64fc82c | 1640 | unsigned long save, to_free_normal, to_free_highmem, free; |
64a473cb | 1641 | |
6715045d RW |
1642 | save = count_data_pages(); |
1643 | if (alloc_normal >= save) { | |
1644 | to_free_normal = alloc_normal - save; | |
1645 | save = 0; | |
1646 | } else { | |
1647 | to_free_normal = 0; | |
1648 | save -= alloc_normal; | |
1649 | } | |
1650 | save += count_highmem_pages(); | |
1651 | if (alloc_highmem >= save) { | |
1652 | to_free_highmem = alloc_highmem - save; | |
64a473cb RW |
1653 | } else { |
1654 | to_free_highmem = 0; | |
4d4cf23c RW |
1655 | save -= alloc_highmem; |
1656 | if (to_free_normal > save) | |
1657 | to_free_normal -= save; | |
1658 | else | |
1659 | to_free_normal = 0; | |
64a473cb | 1660 | } |
a64fc82c | 1661 | free = to_free_normal + to_free_highmem; |
64a473cb RW |
1662 | |
1663 | memory_bm_position_reset(©_bm); | |
1664 | ||
a9c9b442 | 1665 | while (to_free_normal > 0 || to_free_highmem > 0) { |
64a473cb RW |
1666 | unsigned long pfn = memory_bm_next_pfn(©_bm); |
1667 | struct page *page = pfn_to_page(pfn); | |
1668 | ||
1669 | if (PageHighMem(page)) { | |
1670 | if (!to_free_highmem) | |
1671 | continue; | |
1672 | to_free_highmem--; | |
1673 | alloc_highmem--; | |
1674 | } else { | |
1675 | if (!to_free_normal) | |
1676 | continue; | |
1677 | to_free_normal--; | |
1678 | alloc_normal--; | |
1679 | } | |
1680 | memory_bm_clear_bit(©_bm, pfn); | |
1681 | swsusp_unset_page_forbidden(page); | |
1682 | swsusp_unset_page_free(page); | |
1683 | __free_page(page); | |
1684 | } | |
a64fc82c WK |
1685 | |
1686 | return free; | |
64a473cb RW |
1687 | } |
1688 | ||
ef4aede3 | 1689 | /** |
ef96f639 | 1690 | * minimum_image_size - Estimate the minimum acceptable size of an image. |
ef4aede3 RW |
1691 | * @saveable: Number of saveable pages in the system. |
1692 | * | |
1693 | * We want to avoid attempting to free too much memory too hard, so estimate the | |
1694 | * minimum acceptable size of a hibernation image to use as the lower limit for | |
1695 | * preallocating memory. | |
1696 | * | |
1697 | * We assume that the minimum image size should be proportional to | |
1698 | * | |
1699 | * [number of saveable pages] - [number of pages that can be freed in theory] | |
1700 | * | |
1701 | * where the second term is the sum of (1) reclaimable slab pages, (2) active | |
bdbc98ab | 1702 | * and (3) inactive anonymous pages, (4) active and (5) inactive file pages. |
ef4aede3 RW |
1703 | */ |
1704 | static unsigned long minimum_image_size(unsigned long saveable) | |
1705 | { | |
1706 | unsigned long size; | |
1707 | ||
d42f3245 | 1708 | size = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) |
599d0c95 MG |
1709 | + global_node_page_state(NR_ACTIVE_ANON) |
1710 | + global_node_page_state(NR_INACTIVE_ANON) | |
1711 | + global_node_page_state(NR_ACTIVE_FILE) | |
bdbc98ab | 1712 | + global_node_page_state(NR_INACTIVE_FILE); |
ef4aede3 RW |
1713 | |
1714 | return saveable <= size ? 0 : saveable - size; | |
1715 | } | |
1716 | ||
64a473cb | 1717 | /** |
ef96f639 | 1718 | * hibernate_preallocate_memory - Preallocate memory for hibernation image. |
4bb33435 RW |
1719 | * |
1720 | * To create a hibernation image it is necessary to make a copy of every page | |
1721 | * frame in use. We also need a number of page frames to be free during | |
1722 | * hibernation for allocations made while saving the image and for device | |
1723 | * drivers, in case they need to allocate memory from their hibernation | |
ddeb6487 | 1724 | * callbacks (these two numbers are given by PAGES_FOR_IO (which is a rough |
b0c609ab | 1725 | * estimate) and reserved_size divided by PAGE_SIZE (which is tunable through |
ddeb6487 RW |
1726 | * /sys/power/reserved_size, respectively). To make this happen, we compute the |
1727 | * total number of available page frames and allocate at least | |
4bb33435 | 1728 | * |
ddeb6487 RW |
1729 | * ([page frames total] + PAGES_FOR_IO + [metadata pages]) / 2 |
1730 | * + 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE) | |
4bb33435 RW |
1731 | * |
1732 | * of them, which corresponds to the maximum size of a hibernation image. | |
1733 | * | |
1734 | * If image_size is set below the number following from the above formula, | |
1735 | * the preallocation of memory is continued until the total number of saveable | |
ef4aede3 RW |
1736 | * pages in the system is below the requested image size or the minimum |
1737 | * acceptable image size returned by minimum_image_size(), whichever is greater. | |
4bb33435 | 1738 | */ |
64a473cb | 1739 | int hibernate_preallocate_memory(void) |
fe419535 | 1740 | { |
fe419535 | 1741 | struct zone *zone; |
4bb33435 | 1742 | unsigned long saveable, size, max_size, count, highmem, pages = 0; |
6715045d | 1743 | unsigned long alloc, save_highmem, pages_highmem, avail_normal; |
db597605 | 1744 | ktime_t start, stop; |
64a473cb | 1745 | int error; |
fe419535 | 1746 | |
7a7b99bf | 1747 | pr_info("Preallocating image memory\n"); |
db597605 | 1748 | start = ktime_get(); |
fe419535 | 1749 | |
64a473cb | 1750 | error = memory_bm_create(&orig_bm, GFP_IMAGE, PG_ANY); |
7a7b99bf LS |
1751 | if (error) { |
1752 | pr_err("Cannot allocate original bitmap\n"); | |
64a473cb | 1753 | goto err_out; |
7a7b99bf | 1754 | } |
64a473cb RW |
1755 | |
1756 | error = memory_bm_create(©_bm, GFP_IMAGE, PG_ANY); | |
7a7b99bf LS |
1757 | if (error) { |
1758 | pr_err("Cannot allocate copy bitmap\n"); | |
64a473cb | 1759 | goto err_out; |
7a7b99bf | 1760 | } |
64a473cb RW |
1761 | |
1762 | alloc_normal = 0; | |
1763 | alloc_highmem = 0; | |
1764 | ||
4bb33435 | 1765 | /* Count the number of saveable data pages. */ |
64a473cb | 1766 | save_highmem = count_highmem_pages(); |
4bb33435 | 1767 | saveable = count_data_pages(); |
fe419535 | 1768 | |
4bb33435 RW |
1769 | /* |
1770 | * Compute the total number of page frames we can use (count) and the | |
1771 | * number of pages needed for image metadata (size). | |
1772 | */ | |
1773 | count = saveable; | |
64a473cb RW |
1774 | saveable += save_highmem; |
1775 | highmem = save_highmem; | |
4bb33435 RW |
1776 | size = 0; |
1777 | for_each_populated_zone(zone) { | |
1778 | size += snapshot_additional_pages(zone); | |
1779 | if (is_highmem(zone)) | |
1780 | highmem += zone_page_state(zone, NR_FREE_PAGES); | |
1781 | else | |
1782 | count += zone_page_state(zone, NR_FREE_PAGES); | |
1783 | } | |
6715045d | 1784 | avail_normal = count; |
4bb33435 RW |
1785 | count += highmem; |
1786 | count -= totalreserve_pages; | |
1787 | ||
1788 | /* Compute the maximum number of saveable pages to leave in memory. */ | |
ddeb6487 RW |
1789 | max_size = (count - (size + PAGES_FOR_IO)) / 2 |
1790 | - 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE); | |
266f1a25 | 1791 | /* Compute the desired number of image pages specified by image_size. */ |
4bb33435 RW |
1792 | size = DIV_ROUND_UP(image_size, PAGE_SIZE); |
1793 | if (size > max_size) | |
1794 | size = max_size; | |
1795 | /* | |
266f1a25 RW |
1796 | * If the desired number of image pages is at least as large as the |
1797 | * current number of saveable pages in memory, allocate page frames for | |
1798 | * the image and we're done. | |
4bb33435 | 1799 | */ |
64a473cb RW |
1800 | if (size >= saveable) { |
1801 | pages = preallocate_image_highmem(save_highmem); | |
6715045d | 1802 | pages += preallocate_image_memory(saveable - pages, avail_normal); |
4bb33435 | 1803 | goto out; |
64a473cb | 1804 | } |
4bb33435 | 1805 | |
ef4aede3 RW |
1806 | /* Estimate the minimum size of the image. */ |
1807 | pages = minimum_image_size(saveable); | |
6715045d RW |
1808 | /* |
1809 | * To avoid excessive pressure on the normal zone, leave room in it to | |
1810 | * accommodate an image of the minimum size (unless it's already too | |
1811 | * small, in which case don't preallocate pages from it at all). | |
1812 | */ | |
1813 | if (avail_normal > pages) | |
1814 | avail_normal -= pages; | |
1815 | else | |
1816 | avail_normal = 0; | |
ef4aede3 RW |
1817 | if (size < pages) |
1818 | size = min_t(unsigned long, pages, max_size); | |
1819 | ||
4bb33435 RW |
1820 | /* |
1821 | * Let the memory management subsystem know that we're going to need a | |
1822 | * large number of page frames to allocate and make it free some memory. | |
1823 | * NOTE: If this is not done, performance will be hurt badly in some | |
1824 | * test cases. | |
1825 | */ | |
1826 | shrink_all_memory(saveable - size); | |
1827 | ||
1828 | /* | |
1829 | * The number of saveable pages in memory was too high, so apply some | |
1830 | * pressure to decrease it. First, make room for the largest possible | |
1831 | * image and fail if that doesn't work. Next, try to decrease the size | |
ef4aede3 RW |
1832 | * of the image as much as indicated by 'size' using allocations from |
1833 | * highmem and non-highmem zones separately. | |
4bb33435 RW |
1834 | */ |
1835 | pages_highmem = preallocate_image_highmem(highmem / 2); | |
fd432b9f AL |
1836 | alloc = count - max_size; |
1837 | if (alloc > pages_highmem) | |
1838 | alloc -= pages_highmem; | |
1839 | else | |
1840 | alloc = 0; | |
6715045d RW |
1841 | pages = preallocate_image_memory(alloc, avail_normal); |
1842 | if (pages < alloc) { | |
1843 | /* We have exhausted non-highmem pages, try highmem. */ | |
1844 | alloc -= pages; | |
1845 | pages += pages_highmem; | |
1846 | pages_highmem = preallocate_image_highmem(alloc); | |
7a7b99bf LS |
1847 | if (pages_highmem < alloc) { |
1848 | pr_err("Image allocation is %lu pages short\n", | |
1849 | alloc - pages_highmem); | |
6715045d | 1850 | goto err_out; |
7a7b99bf | 1851 | } |
6715045d RW |
1852 | pages += pages_highmem; |
1853 | /* | |
1854 | * size is the desired number of saveable pages to leave in | |
1855 | * memory, so try to preallocate (all memory - size) pages. | |
1856 | */ | |
1857 | alloc = (count - pages) - size; | |
1858 | pages += preallocate_image_highmem(alloc); | |
1859 | } else { | |
1860 | /* | |
1861 | * There are approximately max_size saveable pages at this point | |
1862 | * and we want to reduce this number down to size. | |
1863 | */ | |
1864 | alloc = max_size - size; | |
1865 | size = preallocate_highmem_fraction(alloc, highmem, count); | |
1866 | pages_highmem += size; | |
1867 | alloc -= size; | |
1868 | size = preallocate_image_memory(alloc, avail_normal); | |
1869 | pages_highmem += preallocate_image_highmem(alloc - size); | |
1870 | pages += pages_highmem + size; | |
1871 | } | |
4bb33435 | 1872 | |
64a473cb RW |
1873 | /* |
1874 | * We only need as many page frames for the image as there are saveable | |
1875 | * pages in memory, but we have allocated more. Release the excessive | |
1876 | * ones now. | |
1877 | */ | |
a64fc82c | 1878 | pages -= free_unnecessary_pages(); |
4bb33435 RW |
1879 | |
1880 | out: | |
db597605 | 1881 | stop = ktime_get(); |
5c0e9de0 | 1882 | pr_info("Allocated %lu pages for snapshot\n", pages); |
db597605 | 1883 | swsusp_show_speed(start, stop, pages, "Allocated"); |
fe419535 RW |
1884 | |
1885 | return 0; | |
64a473cb RW |
1886 | |
1887 | err_out: | |
64a473cb RW |
1888 | swsusp_free(); |
1889 | return -ENOMEM; | |
fe419535 RW |
1890 | } |
1891 | ||
8357376d RW |
1892 | #ifdef CONFIG_HIGHMEM |
1893 | /** | |
ef96f639 RW |
1894 | * count_pages_for_highmem - Count non-highmem pages needed for copying highmem. |
1895 | * | |
1896 | * Compute the number of non-highmem pages that will be necessary for creating | |
1897 | * copies of highmem pages. | |
1898 | */ | |
8357376d RW |
1899 | static unsigned int count_pages_for_highmem(unsigned int nr_highmem) |
1900 | { | |
64a473cb | 1901 | unsigned int free_highmem = count_free_highmem_pages() + alloc_highmem; |
8357376d RW |
1902 | |
1903 | if (free_highmem >= nr_highmem) | |
1904 | nr_highmem = 0; | |
1905 | else | |
1906 | nr_highmem -= free_highmem; | |
1907 | ||
1908 | return nr_highmem; | |
1909 | } | |
1910 | #else | |
efd5a852 | 1911 | static unsigned int count_pages_for_highmem(unsigned int nr_highmem) { return 0; } |
8357376d | 1912 | #endif /* CONFIG_HIGHMEM */ |
25761b6e RW |
1913 | |
1914 | /** | |
ef96f639 | 1915 | * enough_free_mem - Check if there is enough free memory for the image. |
25761b6e | 1916 | */ |
8357376d | 1917 | static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem) |
25761b6e | 1918 | { |
e5e2fa78 | 1919 | struct zone *zone; |
64a473cb | 1920 | unsigned int free = alloc_normal; |
e5e2fa78 | 1921 | |
98e73dc5 | 1922 | for_each_populated_zone(zone) |
8357376d | 1923 | if (!is_highmem(zone)) |
d23ad423 | 1924 | free += zone_page_state(zone, NR_FREE_PAGES); |
940864dd | 1925 | |
8357376d | 1926 | nr_pages += count_pages_for_highmem(nr_highmem); |
64ec72a1 JP |
1927 | pr_debug("Normal pages needed: %u + %u, available pages: %u\n", |
1928 | nr_pages, PAGES_FOR_IO, free); | |
940864dd | 1929 | |
64a473cb | 1930 | return free > nr_pages + PAGES_FOR_IO; |
25761b6e RW |
1931 | } |
1932 | ||
8357376d RW |
1933 | #ifdef CONFIG_HIGHMEM |
1934 | /** | |
ef96f639 RW |
1935 | * get_highmem_buffer - Allocate a buffer for highmem pages. |
1936 | * | |
1937 | * If there are some highmem pages in the hibernation image, we may need a | |
1938 | * buffer to copy them and/or load their data. | |
8357376d | 1939 | */ |
8357376d RW |
1940 | static inline int get_highmem_buffer(int safe_needed) |
1941 | { | |
453f85d4 | 1942 | buffer = get_image_page(GFP_ATOMIC, safe_needed); |
8357376d RW |
1943 | return buffer ? 0 : -ENOMEM; |
1944 | } | |
1945 | ||
1946 | /** | |
ef96f639 RW |
1947 | * alloc_highmem_image_pages - Allocate some highmem pages for the image. |
1948 | * | |
1949 | * Try to allocate as many pages as needed, but if the number of free highmem | |
1950 | * pages is less than that, allocate them all. | |
8357376d | 1951 | */ |
efd5a852 RW |
1952 | static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm, |
1953 | unsigned int nr_highmem) | |
8357376d RW |
1954 | { |
1955 | unsigned int to_alloc = count_free_highmem_pages(); | |
1956 | ||
1957 | if (to_alloc > nr_highmem) | |
1958 | to_alloc = nr_highmem; | |
1959 | ||
1960 | nr_highmem -= to_alloc; | |
1961 | while (to_alloc-- > 0) { | |
1962 | struct page *page; | |
1963 | ||
d0164adc | 1964 | page = alloc_image_page(__GFP_HIGHMEM|__GFP_KSWAPD_RECLAIM); |
8357376d RW |
1965 | memory_bm_set_bit(bm, page_to_pfn(page)); |
1966 | } | |
1967 | return nr_highmem; | |
1968 | } | |
1969 | #else | |
1970 | static inline int get_highmem_buffer(int safe_needed) { return 0; } | |
1971 | ||
efd5a852 RW |
1972 | static inline unsigned int alloc_highmem_pages(struct memory_bitmap *bm, |
1973 | unsigned int n) { return 0; } | |
8357376d RW |
1974 | #endif /* CONFIG_HIGHMEM */ |
1975 | ||
1976 | /** | |
ef96f639 | 1977 | * swsusp_alloc - Allocate memory for hibernation image. |
8357376d | 1978 | * |
ef96f639 RW |
1979 | * We first try to allocate as many highmem pages as there are |
1980 | * saveable highmem pages in the system. If that fails, we allocate | |
1981 | * non-highmem pages for the copies of the remaining highmem ones. | |
8357376d | 1982 | * |
ef96f639 RW |
1983 | * In this approach it is likely that the copies of highmem pages will |
1984 | * also be located in the high memory, because of the way in which | |
1985 | * copy_data_pages() works. | |
8357376d | 1986 | */ |
eba74c29 | 1987 | static int swsusp_alloc(struct memory_bitmap *copy_bm, |
efd5a852 | 1988 | unsigned int nr_pages, unsigned int nr_highmem) |
054bd4c1 | 1989 | { |
8357376d | 1990 | if (nr_highmem > 0) { |
2e725a06 | 1991 | if (get_highmem_buffer(PG_ANY)) |
64a473cb RW |
1992 | goto err_out; |
1993 | if (nr_highmem > alloc_highmem) { | |
1994 | nr_highmem -= alloc_highmem; | |
1995 | nr_pages += alloc_highmem_pages(copy_bm, nr_highmem); | |
1996 | } | |
8357376d | 1997 | } |
64a473cb RW |
1998 | if (nr_pages > alloc_normal) { |
1999 | nr_pages -= alloc_normal; | |
2000 | while (nr_pages-- > 0) { | |
2001 | struct page *page; | |
2002 | ||
453f85d4 | 2003 | page = alloc_image_page(GFP_ATOMIC); |
64a473cb RW |
2004 | if (!page) |
2005 | goto err_out; | |
2006 | memory_bm_set_bit(copy_bm, page_to_pfn(page)); | |
2007 | } | |
25761b6e | 2008 | } |
64a473cb | 2009 | |
b788db79 | 2010 | return 0; |
25761b6e | 2011 | |
64a473cb | 2012 | err_out: |
b788db79 | 2013 | swsusp_free(); |
2e725a06 | 2014 | return -ENOMEM; |
25761b6e RW |
2015 | } |
2016 | ||
722a9f92 | 2017 | asmlinkage __visible int swsusp_save(void) |
25761b6e | 2018 | { |
8357376d | 2019 | unsigned int nr_pages, nr_highmem; |
25761b6e | 2020 | |
7a7b99bf | 2021 | pr_info("Creating image:\n"); |
25761b6e | 2022 | |
9f8f2172 | 2023 | drain_local_pages(NULL); |
a0f49651 | 2024 | nr_pages = count_data_pages(); |
8357376d | 2025 | nr_highmem = count_highmem_pages(); |
64ec72a1 | 2026 | pr_info("Need to copy %u pages\n", nr_pages + nr_highmem); |
25761b6e | 2027 | |
8357376d | 2028 | if (!enough_free_mem(nr_pages, nr_highmem)) { |
64ec72a1 | 2029 | pr_err("Not enough free memory\n"); |
25761b6e RW |
2030 | return -ENOMEM; |
2031 | } | |
2032 | ||
eba74c29 | 2033 | if (swsusp_alloc(©_bm, nr_pages, nr_highmem)) { |
64ec72a1 | 2034 | pr_err("Memory allocation failed\n"); |
a0f49651 | 2035 | return -ENOMEM; |
8357376d | 2036 | } |
25761b6e | 2037 | |
ef96f639 RW |
2038 | /* |
2039 | * During allocating of suspend pagedir, new cold pages may appear. | |
25761b6e RW |
2040 | * Kill them. |
2041 | */ | |
9f8f2172 | 2042 | drain_local_pages(NULL); |
b788db79 | 2043 | copy_data_pages(©_bm, &orig_bm); |
25761b6e RW |
2044 | |
2045 | /* | |
2046 | * End of critical section. From now on, we can write to memory, | |
2047 | * but we should not touch disk. This specially means we must _not_ | |
2048 | * touch swap space! Except we must write out our image of course. | |
2049 | */ | |
2050 | ||
8357376d | 2051 | nr_pages += nr_highmem; |
a0f49651 | 2052 | nr_copy_pages = nr_pages; |
8357376d | 2053 | nr_meta_pages = DIV_ROUND_UP(nr_pages * sizeof(long), PAGE_SIZE); |
a0f49651 | 2054 | |
7a7b99bf | 2055 | pr_info("Image created (%d pages copied)\n", nr_pages); |
8357376d | 2056 | |
25761b6e RW |
2057 | return 0; |
2058 | } | |
f577eb30 | 2059 | |
d307c4a8 RW |
2060 | #ifndef CONFIG_ARCH_HIBERNATION_HEADER |
2061 | static int init_header_complete(struct swsusp_info *info) | |
f577eb30 | 2062 | { |
d307c4a8 | 2063 | memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname)); |
f577eb30 | 2064 | info->version_code = LINUX_VERSION_CODE; |
d307c4a8 RW |
2065 | return 0; |
2066 | } | |
2067 | ||
02d7f400 | 2068 | static const char *check_image_kernel(struct swsusp_info *info) |
d307c4a8 RW |
2069 | { |
2070 | if (info->version_code != LINUX_VERSION_CODE) | |
2071 | return "kernel version"; | |
2072 | if (strcmp(info->uts.sysname,init_utsname()->sysname)) | |
2073 | return "system type"; | |
2074 | if (strcmp(info->uts.release,init_utsname()->release)) | |
2075 | return "kernel release"; | |
2076 | if (strcmp(info->uts.version,init_utsname()->version)) | |
2077 | return "version"; | |
2078 | if (strcmp(info->uts.machine,init_utsname()->machine)) | |
2079 | return "machine"; | |
2080 | return NULL; | |
2081 | } | |
2082 | #endif /* CONFIG_ARCH_HIBERNATION_HEADER */ | |
2083 | ||
af508b34 RW |
2084 | unsigned long snapshot_get_image_size(void) |
2085 | { | |
2086 | return nr_copy_pages + nr_meta_pages + 1; | |
2087 | } | |
2088 | ||
d307c4a8 RW |
2089 | static int init_header(struct swsusp_info *info) |
2090 | { | |
2091 | memset(info, 0, sizeof(struct swsusp_info)); | |
0ed5fd13 | 2092 | info->num_physpages = get_num_physpages(); |
f577eb30 | 2093 | info->image_pages = nr_copy_pages; |
af508b34 | 2094 | info->pages = snapshot_get_image_size(); |
6e1819d6 RW |
2095 | info->size = info->pages; |
2096 | info->size <<= PAGE_SHIFT; | |
d307c4a8 | 2097 | return init_header_complete(info); |
f577eb30 RW |
2098 | } |
2099 | ||
2100 | /** | |
ef96f639 RW |
2101 | * pack_pfns - Prepare PFNs for saving. |
2102 | * @bm: Memory bitmap. | |
2103 | * @buf: Memory buffer to store the PFNs in. | |
2104 | * | |
2105 | * PFNs corresponding to set bits in @bm are stored in the area of memory | |
2106 | * pointed to by @buf (1 page at a time). | |
f577eb30 | 2107 | */ |
efd5a852 | 2108 | static inline void pack_pfns(unsigned long *buf, struct memory_bitmap *bm) |
f577eb30 RW |
2109 | { |
2110 | int j; | |
2111 | ||
b788db79 | 2112 | for (j = 0; j < PAGE_SIZE / sizeof(long); j++) { |
940864dd RW |
2113 | buf[j] = memory_bm_next_pfn(bm); |
2114 | if (unlikely(buf[j] == BM_END_OF_MAP)) | |
b788db79 | 2115 | break; |
f577eb30 | 2116 | } |
f577eb30 RW |
2117 | } |
2118 | ||
2119 | /** | |
ef96f639 RW |
2120 | * snapshot_read_next - Get the address to read the next image page from. |
2121 | * @handle: Snapshot handle to be used for the reading. | |
f577eb30 | 2122 | * |
ef96f639 RW |
2123 | * On the first call, @handle should point to a zeroed snapshot_handle |
2124 | * structure. The structure gets populated then and a pointer to it should be | |
2125 | * passed to this function every next time. | |
f577eb30 | 2126 | * |
ef96f639 RW |
2127 | * On success, the function returns a positive number. Then, the caller |
2128 | * is allowed to read up to the returned number of bytes from the memory | |
2129 | * location computed by the data_of() macro. | |
f577eb30 | 2130 | * |
ef96f639 RW |
2131 | * The function returns 0 to indicate the end of the data stream condition, |
2132 | * and negative numbers are returned on errors. If that happens, the structure | |
2133 | * pointed to by @handle is not updated and should not be used any more. | |
f577eb30 | 2134 | */ |
d3c1b24c | 2135 | int snapshot_read_next(struct snapshot_handle *handle) |
f577eb30 | 2136 | { |
fb13a28b | 2137 | if (handle->cur > nr_meta_pages + nr_copy_pages) |
f577eb30 | 2138 | return 0; |
b788db79 | 2139 | |
f577eb30 RW |
2140 | if (!buffer) { |
2141 | /* This makes the buffer be freed by swsusp_free() */ | |
8357376d | 2142 | buffer = get_image_page(GFP_ATOMIC, PG_ANY); |
f577eb30 RW |
2143 | if (!buffer) |
2144 | return -ENOMEM; | |
2145 | } | |
d3c1b24c | 2146 | if (!handle->cur) { |
d307c4a8 RW |
2147 | int error; |
2148 | ||
2149 | error = init_header((struct swsusp_info *)buffer); | |
2150 | if (error) | |
2151 | return error; | |
f577eb30 | 2152 | handle->buffer = buffer; |
b788db79 RW |
2153 | memory_bm_position_reset(&orig_bm); |
2154 | memory_bm_position_reset(©_bm); | |
d3c1b24c | 2155 | } else if (handle->cur <= nr_meta_pages) { |
3ecb01df | 2156 | clear_page(buffer); |
d3c1b24c JS |
2157 | pack_pfns(buffer, &orig_bm); |
2158 | } else { | |
2159 | struct page *page; | |
b788db79 | 2160 | |
d3c1b24c JS |
2161 | page = pfn_to_page(memory_bm_next_pfn(©_bm)); |
2162 | if (PageHighMem(page)) { | |
ef96f639 RW |
2163 | /* |
2164 | * Highmem pages are copied to the buffer, | |
d3c1b24c JS |
2165 | * because we can't return with a kmapped |
2166 | * highmem page (we may not be called again). | |
2167 | */ | |
2168 | void *kaddr; | |
8357376d | 2169 | |
0de9a1e2 | 2170 | kaddr = kmap_atomic(page); |
3ecb01df | 2171 | copy_page(buffer, kaddr); |
0de9a1e2 | 2172 | kunmap_atomic(kaddr); |
d3c1b24c JS |
2173 | handle->buffer = buffer; |
2174 | } else { | |
2175 | handle->buffer = page_address(page); | |
f577eb30 | 2176 | } |
f577eb30 | 2177 | } |
d3c1b24c JS |
2178 | handle->cur++; |
2179 | return PAGE_SIZE; | |
f577eb30 RW |
2180 | } |
2181 | ||
6dbecfd3 RW |
2182 | static void duplicate_memory_bitmap(struct memory_bitmap *dst, |
2183 | struct memory_bitmap *src) | |
2184 | { | |
2185 | unsigned long pfn; | |
2186 | ||
2187 | memory_bm_position_reset(src); | |
2188 | pfn = memory_bm_next_pfn(src); | |
2189 | while (pfn != BM_END_OF_MAP) { | |
2190 | memory_bm_set_bit(dst, pfn); | |
2191 | pfn = memory_bm_next_pfn(src); | |
2192 | } | |
2193 | } | |
2194 | ||
f577eb30 | 2195 | /** |
ef96f639 RW |
2196 | * mark_unsafe_pages - Mark pages that were used before hibernation. |
2197 | * | |
2198 | * Mark the pages that cannot be used for storing the image during restoration, | |
2199 | * because they conflict with the pages that had been used before hibernation. | |
f577eb30 | 2200 | */ |
6dbecfd3 | 2201 | static void mark_unsafe_pages(struct memory_bitmap *bm) |
f577eb30 | 2202 | { |
6dbecfd3 | 2203 | unsigned long pfn; |
f577eb30 | 2204 | |
6dbecfd3 RW |
2205 | /* Clear the "free"/"unsafe" bit for all PFNs */ |
2206 | memory_bm_position_reset(free_pages_map); | |
2207 | pfn = memory_bm_next_pfn(free_pages_map); | |
2208 | while (pfn != BM_END_OF_MAP) { | |
2209 | memory_bm_clear_current(free_pages_map); | |
2210 | pfn = memory_bm_next_pfn(free_pages_map); | |
f577eb30 RW |
2211 | } |
2212 | ||
6dbecfd3 RW |
2213 | /* Mark pages that correspond to the "original" PFNs as "unsafe" */ |
2214 | duplicate_memory_bitmap(free_pages_map, bm); | |
f577eb30 | 2215 | |
940864dd | 2216 | allocated_unsafe_pages = 0; |
f577eb30 RW |
2217 | } |
2218 | ||
d307c4a8 | 2219 | static int check_header(struct swsusp_info *info) |
f577eb30 | 2220 | { |
02d7f400 | 2221 | const char *reason; |
f577eb30 | 2222 | |
d307c4a8 | 2223 | reason = check_image_kernel(info); |
0ed5fd13 | 2224 | if (!reason && info->num_physpages != get_num_physpages()) |
f577eb30 | 2225 | reason = "memory size"; |
f577eb30 | 2226 | if (reason) { |
64ec72a1 | 2227 | pr_err("Image mismatch: %s\n", reason); |
f577eb30 RW |
2228 | return -EPERM; |
2229 | } | |
2230 | return 0; | |
2231 | } | |
2232 | ||
2233 | /** | |
ef96f639 | 2234 | * load header - Check the image header and copy the data from it. |
f577eb30 | 2235 | */ |
efd5a852 | 2236 | static int load_header(struct swsusp_info *info) |
f577eb30 RW |
2237 | { |
2238 | int error; | |
f577eb30 | 2239 | |
940864dd | 2240 | restore_pblist = NULL; |
f577eb30 RW |
2241 | error = check_header(info); |
2242 | if (!error) { | |
f577eb30 RW |
2243 | nr_copy_pages = info->image_pages; |
2244 | nr_meta_pages = info->pages - info->image_pages - 1; | |
2245 | } | |
2246 | return error; | |
2247 | } | |
2248 | ||
2249 | /** | |
ef96f639 RW |
2250 | * unpack_orig_pfns - Set bits corresponding to given PFNs in a memory bitmap. |
2251 | * @bm: Memory bitmap. | |
2252 | * @buf: Area of memory containing the PFNs. | |
2253 | * | |
2254 | * For each element of the array pointed to by @buf (1 page at a time), set the | |
2255 | * corresponding bit in @bm. | |
f577eb30 | 2256 | */ |
69643279 | 2257 | static int unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm) |
f577eb30 RW |
2258 | { |
2259 | int j; | |
2260 | ||
940864dd RW |
2261 | for (j = 0; j < PAGE_SIZE / sizeof(long); j++) { |
2262 | if (unlikely(buf[j] == BM_END_OF_MAP)) | |
2263 | break; | |
2264 | ||
6dbecfd3 | 2265 | if (pfn_valid(buf[j]) && memory_bm_pfn_present(bm, buf[j])) |
69643279 RW |
2266 | memory_bm_set_bit(bm, buf[j]); |
2267 | else | |
2268 | return -EFAULT; | |
f577eb30 | 2269 | } |
69643279 RW |
2270 | |
2271 | return 0; | |
f577eb30 RW |
2272 | } |
2273 | ||
8357376d | 2274 | #ifdef CONFIG_HIGHMEM |
ef96f639 RW |
2275 | /* |
2276 | * struct highmem_pbe is used for creating the list of highmem pages that | |
8357376d RW |
2277 | * should be restored atomically during the resume from disk, because the page |
2278 | * frames they have occupied before the suspend are in use. | |
2279 | */ | |
2280 | struct highmem_pbe { | |
2281 | struct page *copy_page; /* data is here now */ | |
2282 | struct page *orig_page; /* data was here before the suspend */ | |
2283 | struct highmem_pbe *next; | |
2284 | }; | |
2285 | ||
ef96f639 RW |
2286 | /* |
2287 | * List of highmem PBEs needed for restoring the highmem pages that were | |
8357376d RW |
2288 | * allocated before the suspend and included in the suspend image, but have |
2289 | * also been allocated by the "resume" kernel, so their contents cannot be | |
2290 | * written directly to their "original" page frames. | |
2291 | */ | |
2292 | static struct highmem_pbe *highmem_pblist; | |
2293 | ||
2294 | /** | |
ef96f639 RW |
2295 | * count_highmem_image_pages - Compute the number of highmem pages in the image. |
2296 | * @bm: Memory bitmap. | |
2297 | * | |
2298 | * The bits in @bm that correspond to image pages are assumed to be set. | |
8357376d | 2299 | */ |
8357376d RW |
2300 | static unsigned int count_highmem_image_pages(struct memory_bitmap *bm) |
2301 | { | |
2302 | unsigned long pfn; | |
2303 | unsigned int cnt = 0; | |
2304 | ||
2305 | memory_bm_position_reset(bm); | |
2306 | pfn = memory_bm_next_pfn(bm); | |
2307 | while (pfn != BM_END_OF_MAP) { | |
2308 | if (PageHighMem(pfn_to_page(pfn))) | |
2309 | cnt++; | |
2310 | ||
2311 | pfn = memory_bm_next_pfn(bm); | |
2312 | } | |
2313 | return cnt; | |
2314 | } | |
2315 | ||
8357376d RW |
2316 | static unsigned int safe_highmem_pages; |
2317 | ||
2318 | static struct memory_bitmap *safe_highmem_bm; | |
2319 | ||
ef96f639 RW |
2320 | /** |
2321 | * prepare_highmem_image - Allocate memory for loading highmem data from image. | |
2322 | * @bm: Pointer to an uninitialized memory bitmap structure. | |
2323 | * @nr_highmem_p: Pointer to the number of highmem image pages. | |
2324 | * | |
2325 | * Try to allocate as many highmem pages as there are highmem image pages | |
2326 | * (@nr_highmem_p points to the variable containing the number of highmem image | |
2327 | * pages). The pages that are "safe" (ie. will not be overwritten when the | |
2328 | * hibernation image is restored entirely) have the corresponding bits set in | |
2329 | * @bm (it must be unitialized). | |
2330 | * | |
2331 | * NOTE: This function should not be called if there are no highmem image pages. | |
2332 | */ | |
efd5a852 RW |
2333 | static int prepare_highmem_image(struct memory_bitmap *bm, |
2334 | unsigned int *nr_highmem_p) | |
8357376d RW |
2335 | { |
2336 | unsigned int to_alloc; | |
2337 | ||
2338 | if (memory_bm_create(bm, GFP_ATOMIC, PG_SAFE)) | |
2339 | return -ENOMEM; | |
2340 | ||
2341 | if (get_highmem_buffer(PG_SAFE)) | |
2342 | return -ENOMEM; | |
2343 | ||
2344 | to_alloc = count_free_highmem_pages(); | |
2345 | if (to_alloc > *nr_highmem_p) | |
2346 | to_alloc = *nr_highmem_p; | |
2347 | else | |
2348 | *nr_highmem_p = to_alloc; | |
2349 | ||
2350 | safe_highmem_pages = 0; | |
2351 | while (to_alloc-- > 0) { | |
2352 | struct page *page; | |
2353 | ||
2354 | page = alloc_page(__GFP_HIGHMEM); | |
7be98234 | 2355 | if (!swsusp_page_is_free(page)) { |
8357376d RW |
2356 | /* The page is "safe", set its bit the bitmap */ |
2357 | memory_bm_set_bit(bm, page_to_pfn(page)); | |
2358 | safe_highmem_pages++; | |
2359 | } | |
2360 | /* Mark the page as allocated */ | |
7be98234 RW |
2361 | swsusp_set_page_forbidden(page); |
2362 | swsusp_set_page_free(page); | |
8357376d RW |
2363 | } |
2364 | memory_bm_position_reset(bm); | |
2365 | safe_highmem_bm = bm; | |
2366 | return 0; | |
2367 | } | |
2368 | ||
ef96f639 RW |
2369 | static struct page *last_highmem_page; |
2370 | ||
8357376d | 2371 | /** |
ef96f639 RW |
2372 | * get_highmem_page_buffer - Prepare a buffer to store a highmem image page. |
2373 | * | |
2374 | * For a given highmem image page get a buffer that suspend_write_next() should | |
2375 | * return to its caller to write to. | |
8357376d | 2376 | * |
ef96f639 RW |
2377 | * If the page is to be saved to its "original" page frame or a copy of |
2378 | * the page is to be made in the highmem, @buffer is returned. Otherwise, | |
2379 | * the copy of the page is to be made in normal memory, so the address of | |
2380 | * the copy is returned. | |
8357376d | 2381 | * |
ef96f639 RW |
2382 | * If @buffer is returned, the caller of suspend_write_next() will write |
2383 | * the page's contents to @buffer, so they will have to be copied to the | |
2384 | * right location on the next call to suspend_write_next() and it is done | |
2385 | * with the help of copy_last_highmem_page(). For this purpose, if | |
2386 | * @buffer is returned, @last_highmem_page is set to the page to which | |
2387 | * the data will have to be copied from @buffer. | |
8357376d | 2388 | */ |
efd5a852 RW |
2389 | static void *get_highmem_page_buffer(struct page *page, |
2390 | struct chain_allocator *ca) | |
8357376d RW |
2391 | { |
2392 | struct highmem_pbe *pbe; | |
2393 | void *kaddr; | |
2394 | ||
7be98234 | 2395 | if (swsusp_page_is_forbidden(page) && swsusp_page_is_free(page)) { |
ef96f639 RW |
2396 | /* |
2397 | * We have allocated the "original" page frame and we can | |
8357376d RW |
2398 | * use it directly to store the loaded page. |
2399 | */ | |
2400 | last_highmem_page = page; | |
2401 | return buffer; | |
2402 | } | |
ef96f639 RW |
2403 | /* |
2404 | * The "original" page frame has not been allocated and we have to | |
8357376d RW |
2405 | * use a "safe" page frame to store the loaded page. |
2406 | */ | |
2407 | pbe = chain_alloc(ca, sizeof(struct highmem_pbe)); | |
2408 | if (!pbe) { | |
2409 | swsusp_free(); | |
69643279 | 2410 | return ERR_PTR(-ENOMEM); |
8357376d RW |
2411 | } |
2412 | pbe->orig_page = page; | |
2413 | if (safe_highmem_pages > 0) { | |
2414 | struct page *tmp; | |
2415 | ||
2416 | /* Copy of the page will be stored in high memory */ | |
2417 | kaddr = buffer; | |
2418 | tmp = pfn_to_page(memory_bm_next_pfn(safe_highmem_bm)); | |
2419 | safe_highmem_pages--; | |
2420 | last_highmem_page = tmp; | |
2421 | pbe->copy_page = tmp; | |
2422 | } else { | |
2423 | /* Copy of the page will be stored in normal memory */ | |
2424 | kaddr = safe_pages_list; | |
2425 | safe_pages_list = safe_pages_list->next; | |
2426 | pbe->copy_page = virt_to_page(kaddr); | |
2427 | } | |
2428 | pbe->next = highmem_pblist; | |
2429 | highmem_pblist = pbe; | |
2430 | return kaddr; | |
2431 | } | |
2432 | ||
2433 | /** | |
ef96f639 RW |
2434 | * copy_last_highmem_page - Copy most the most recent highmem image page. |
2435 | * | |
2436 | * Copy the contents of a highmem image from @buffer, where the caller of | |
2437 | * snapshot_write_next() has stored them, to the right location represented by | |
2438 | * @last_highmem_page . | |
8357376d | 2439 | */ |
8357376d RW |
2440 | static void copy_last_highmem_page(void) |
2441 | { | |
2442 | if (last_highmem_page) { | |
2443 | void *dst; | |
2444 | ||
0de9a1e2 | 2445 | dst = kmap_atomic(last_highmem_page); |
3ecb01df | 2446 | copy_page(dst, buffer); |
0de9a1e2 | 2447 | kunmap_atomic(dst); |
8357376d RW |
2448 | last_highmem_page = NULL; |
2449 | } | |
2450 | } | |
2451 | ||
2452 | static inline int last_highmem_page_copied(void) | |
2453 | { | |
2454 | return !last_highmem_page; | |
2455 | } | |
2456 | ||
2457 | static inline void free_highmem_data(void) | |
2458 | { | |
2459 | if (safe_highmem_bm) | |
2460 | memory_bm_free(safe_highmem_bm, PG_UNSAFE_CLEAR); | |
2461 | ||
2462 | if (buffer) | |
2463 | free_image_page(buffer, PG_UNSAFE_CLEAR); | |
2464 | } | |
2465 | #else | |
efd5a852 | 2466 | static unsigned int count_highmem_image_pages(struct memory_bitmap *bm) { return 0; } |
8357376d | 2467 | |
efd5a852 RW |
2468 | static inline int prepare_highmem_image(struct memory_bitmap *bm, |
2469 | unsigned int *nr_highmem_p) { return 0; } | |
8357376d | 2470 | |
efd5a852 RW |
2471 | static inline void *get_highmem_page_buffer(struct page *page, |
2472 | struct chain_allocator *ca) | |
8357376d | 2473 | { |
69643279 | 2474 | return ERR_PTR(-EINVAL); |
8357376d RW |
2475 | } |
2476 | ||
2477 | static inline void copy_last_highmem_page(void) {} | |
2478 | static inline int last_highmem_page_copied(void) { return 1; } | |
2479 | static inline void free_highmem_data(void) {} | |
2480 | #endif /* CONFIG_HIGHMEM */ | |
2481 | ||
ef96f639 RW |
2482 | #define PBES_PER_LINKED_PAGE (LINKED_PAGE_DATA_SIZE / sizeof(struct pbe)) |
2483 | ||
f577eb30 | 2484 | /** |
ef96f639 RW |
2485 | * prepare_image - Make room for loading hibernation image. |
2486 | * @new_bm: Unitialized memory bitmap structure. | |
2487 | * @bm: Memory bitmap with unsafe pages marked. | |
2488 | * | |
2489 | * Use @bm to mark the pages that will be overwritten in the process of | |
2490 | * restoring the system memory state from the suspend image ("unsafe" pages) | |
2491 | * and allocate memory for the image. | |
968808b8 | 2492 | * |
ef96f639 RW |
2493 | * The idea is to allocate a new memory bitmap first and then allocate |
2494 | * as many pages as needed for image data, but without specifying what those | |
2495 | * pages will be used for just yet. Instead, we mark them all as allocated and | |
2496 | * create a lists of "safe" pages to be used later. On systems with high | |
2497 | * memory a list of "safe" highmem pages is created too. | |
f577eb30 | 2498 | */ |
efd5a852 | 2499 | static int prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm) |
f577eb30 | 2500 | { |
8357376d | 2501 | unsigned int nr_pages, nr_highmem; |
9c744481 | 2502 | struct linked_page *lp; |
940864dd | 2503 | int error; |
f577eb30 | 2504 | |
8357376d RW |
2505 | /* If there is no highmem, the buffer will not be necessary */ |
2506 | free_image_page(buffer, PG_UNSAFE_CLEAR); | |
2507 | buffer = NULL; | |
2508 | ||
2509 | nr_highmem = count_highmem_image_pages(bm); | |
6dbecfd3 | 2510 | mark_unsafe_pages(bm); |
940864dd RW |
2511 | |
2512 | error = memory_bm_create(new_bm, GFP_ATOMIC, PG_SAFE); | |
2513 | if (error) | |
2514 | goto Free; | |
2515 | ||
2516 | duplicate_memory_bitmap(new_bm, bm); | |
2517 | memory_bm_free(bm, PG_UNSAFE_KEEP); | |
8357376d RW |
2518 | if (nr_highmem > 0) { |
2519 | error = prepare_highmem_image(bm, &nr_highmem); | |
2520 | if (error) | |
2521 | goto Free; | |
2522 | } | |
ef96f639 RW |
2523 | /* |
2524 | * Reserve some safe pages for potential later use. | |
940864dd RW |
2525 | * |
2526 | * NOTE: This way we make sure there will be enough safe pages for the | |
2527 | * chain_alloc() in get_buffer(). It is a bit wasteful, but | |
2528 | * nr_copy_pages cannot be greater than 50% of the memory anyway. | |
9c744481 RW |
2529 | * |
2530 | * nr_copy_pages cannot be less than allocated_unsafe_pages too. | |
940864dd | 2531 | */ |
8357376d | 2532 | nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages; |
940864dd RW |
2533 | nr_pages = DIV_ROUND_UP(nr_pages, PBES_PER_LINKED_PAGE); |
2534 | while (nr_pages > 0) { | |
8357376d | 2535 | lp = get_image_page(GFP_ATOMIC, PG_SAFE); |
940864dd | 2536 | if (!lp) { |
f577eb30 | 2537 | error = -ENOMEM; |
940864dd RW |
2538 | goto Free; |
2539 | } | |
9c744481 RW |
2540 | lp->next = safe_pages_list; |
2541 | safe_pages_list = lp; | |
940864dd | 2542 | nr_pages--; |
f577eb30 | 2543 | } |
940864dd | 2544 | /* Preallocate memory for the image */ |
8357376d | 2545 | nr_pages = nr_copy_pages - nr_highmem - allocated_unsafe_pages; |
940864dd RW |
2546 | while (nr_pages > 0) { |
2547 | lp = (struct linked_page *)get_zeroed_page(GFP_ATOMIC); | |
2548 | if (!lp) { | |
2549 | error = -ENOMEM; | |
2550 | goto Free; | |
2551 | } | |
7be98234 | 2552 | if (!swsusp_page_is_free(virt_to_page(lp))) { |
940864dd RW |
2553 | /* The page is "safe", add it to the list */ |
2554 | lp->next = safe_pages_list; | |
2555 | safe_pages_list = lp; | |
968808b8 | 2556 | } |
940864dd | 2557 | /* Mark the page as allocated */ |
7be98234 RW |
2558 | swsusp_set_page_forbidden(virt_to_page(lp)); |
2559 | swsusp_set_page_free(virt_to_page(lp)); | |
940864dd | 2560 | nr_pages--; |
968808b8 | 2561 | } |
940864dd RW |
2562 | return 0; |
2563 | ||
59a49335 | 2564 | Free: |
940864dd | 2565 | swsusp_free(); |
f577eb30 RW |
2566 | return error; |
2567 | } | |
2568 | ||
940864dd | 2569 | /** |
ef96f639 RW |
2570 | * get_buffer - Get the address to store the next image data page. |
2571 | * | |
2572 | * Get the address that snapshot_write_next() should return to its caller to | |
2573 | * write to. | |
940864dd | 2574 | */ |
940864dd | 2575 | static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca) |
968808b8 | 2576 | { |
940864dd | 2577 | struct pbe *pbe; |
69643279 RW |
2578 | struct page *page; |
2579 | unsigned long pfn = memory_bm_next_pfn(bm); | |
968808b8 | 2580 | |
69643279 RW |
2581 | if (pfn == BM_END_OF_MAP) |
2582 | return ERR_PTR(-EFAULT); | |
2583 | ||
2584 | page = pfn_to_page(pfn); | |
8357376d RW |
2585 | if (PageHighMem(page)) |
2586 | return get_highmem_page_buffer(page, ca); | |
2587 | ||
7be98234 | 2588 | if (swsusp_page_is_forbidden(page) && swsusp_page_is_free(page)) |
ef96f639 RW |
2589 | /* |
2590 | * We have allocated the "original" page frame and we can | |
940864dd | 2591 | * use it directly to store the loaded page. |
968808b8 | 2592 | */ |
940864dd RW |
2593 | return page_address(page); |
2594 | ||
ef96f639 RW |
2595 | /* |
2596 | * The "original" page frame has not been allocated and we have to | |
940864dd | 2597 | * use a "safe" page frame to store the loaded page. |
968808b8 | 2598 | */ |
940864dd RW |
2599 | pbe = chain_alloc(ca, sizeof(struct pbe)); |
2600 | if (!pbe) { | |
2601 | swsusp_free(); | |
69643279 | 2602 | return ERR_PTR(-ENOMEM); |
940864dd | 2603 | } |
8357376d RW |
2604 | pbe->orig_address = page_address(page); |
2605 | pbe->address = safe_pages_list; | |
940864dd RW |
2606 | safe_pages_list = safe_pages_list->next; |
2607 | pbe->next = restore_pblist; | |
2608 | restore_pblist = pbe; | |
8357376d | 2609 | return pbe->address; |
968808b8 RW |
2610 | } |
2611 | ||
f577eb30 | 2612 | /** |
ef96f639 RW |
2613 | * snapshot_write_next - Get the address to store the next image page. |
2614 | * @handle: Snapshot handle structure to guide the writing. | |
f577eb30 | 2615 | * |
ef96f639 RW |
2616 | * On the first call, @handle should point to a zeroed snapshot_handle |
2617 | * structure. The structure gets populated then and a pointer to it should be | |
2618 | * passed to this function every next time. | |
f577eb30 | 2619 | * |
ef96f639 RW |
2620 | * On success, the function returns a positive number. Then, the caller |
2621 | * is allowed to write up to the returned number of bytes to the memory | |
2622 | * location computed by the data_of() macro. | |
f577eb30 | 2623 | * |
ef96f639 RW |
2624 | * The function returns 0 to indicate the "end of file" condition. Negative |
2625 | * numbers are returned on errors, in which cases the structure pointed to by | |
2626 | * @handle is not updated and should not be used any more. | |
f577eb30 | 2627 | */ |
d3c1b24c | 2628 | int snapshot_write_next(struct snapshot_handle *handle) |
f577eb30 | 2629 | { |
940864dd | 2630 | static struct chain_allocator ca; |
f577eb30 RW |
2631 | int error = 0; |
2632 | ||
940864dd | 2633 | /* Check if we have already loaded the entire image */ |
d3c1b24c | 2634 | if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) |
f577eb30 | 2635 | return 0; |
940864dd | 2636 | |
d3c1b24c JS |
2637 | handle->sync_read = 1; |
2638 | ||
2639 | if (!handle->cur) { | |
8357376d RW |
2640 | if (!buffer) |
2641 | /* This makes the buffer be freed by swsusp_free() */ | |
2642 | buffer = get_image_page(GFP_ATOMIC, PG_ANY); | |
2643 | ||
f577eb30 RW |
2644 | if (!buffer) |
2645 | return -ENOMEM; | |
8357376d | 2646 | |
f577eb30 | 2647 | handle->buffer = buffer; |
d3c1b24c JS |
2648 | } else if (handle->cur == 1) { |
2649 | error = load_header(buffer); | |
2650 | if (error) | |
2651 | return error; | |
940864dd | 2652 | |
9c744481 RW |
2653 | safe_pages_list = NULL; |
2654 | ||
d3c1b24c JS |
2655 | error = memory_bm_create(©_bm, GFP_ATOMIC, PG_ANY); |
2656 | if (error) | |
2657 | return error; | |
2658 | ||
4c0b6c10 | 2659 | hibernate_restore_protection_begin(); |
d3c1b24c JS |
2660 | } else if (handle->cur <= nr_meta_pages + 1) { |
2661 | error = unpack_orig_pfns(buffer, ©_bm); | |
2662 | if (error) | |
2663 | return error; | |
940864dd | 2664 | |
d3c1b24c JS |
2665 | if (handle->cur == nr_meta_pages + 1) { |
2666 | error = prepare_image(&orig_bm, ©_bm); | |
69643279 RW |
2667 | if (error) |
2668 | return error; | |
2669 | ||
d3c1b24c JS |
2670 | chain_init(&ca, GFP_ATOMIC, PG_SAFE); |
2671 | memory_bm_position_reset(&orig_bm); | |
2672 | restore_pblist = NULL; | |
940864dd | 2673 | handle->buffer = get_buffer(&orig_bm, &ca); |
d3c1b24c | 2674 | handle->sync_read = 0; |
69643279 RW |
2675 | if (IS_ERR(handle->buffer)) |
2676 | return PTR_ERR(handle->buffer); | |
f577eb30 | 2677 | } |
f577eb30 | 2678 | } else { |
d3c1b24c | 2679 | copy_last_highmem_page(); |
4c0b6c10 | 2680 | hibernate_restore_protect_page(handle->buffer); |
d3c1b24c JS |
2681 | handle->buffer = get_buffer(&orig_bm, &ca); |
2682 | if (IS_ERR(handle->buffer)) | |
2683 | return PTR_ERR(handle->buffer); | |
2684 | if (handle->buffer != buffer) | |
2685 | handle->sync_read = 0; | |
f577eb30 | 2686 | } |
d3c1b24c JS |
2687 | handle->cur++; |
2688 | return PAGE_SIZE; | |
f577eb30 RW |
2689 | } |
2690 | ||
8357376d | 2691 | /** |
ef96f639 RW |
2692 | * snapshot_write_finalize - Complete the loading of a hibernation image. |
2693 | * | |
2694 | * Must be called after the last call to snapshot_write_next() in case the last | |
2695 | * page in the image happens to be a highmem page and its contents should be | |
2696 | * stored in highmem. Additionally, it recycles bitmap memory that's not | |
2697 | * necessary any more. | |
8357376d | 2698 | */ |
8357376d RW |
2699 | void snapshot_write_finalize(struct snapshot_handle *handle) |
2700 | { | |
2701 | copy_last_highmem_page(); | |
4c0b6c10 | 2702 | hibernate_restore_protect_page(handle->buffer); |
307c5971 | 2703 | /* Do that only if we have loaded the image entirely */ |
d3c1b24c | 2704 | if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) { |
307c5971 | 2705 | memory_bm_recycle(&orig_bm); |
8357376d RW |
2706 | free_highmem_data(); |
2707 | } | |
2708 | } | |
2709 | ||
f577eb30 RW |
2710 | int snapshot_image_loaded(struct snapshot_handle *handle) |
2711 | { | |
8357376d | 2712 | return !(!nr_copy_pages || !last_highmem_page_copied() || |
940864dd RW |
2713 | handle->cur <= nr_meta_pages + nr_copy_pages); |
2714 | } | |
2715 | ||
8357376d RW |
2716 | #ifdef CONFIG_HIGHMEM |
2717 | /* Assumes that @buf is ready and points to a "safe" page */ | |
efd5a852 RW |
2718 | static inline void swap_two_pages_data(struct page *p1, struct page *p2, |
2719 | void *buf) | |
940864dd | 2720 | { |
8357376d RW |
2721 | void *kaddr1, *kaddr2; |
2722 | ||
0de9a1e2 CW |
2723 | kaddr1 = kmap_atomic(p1); |
2724 | kaddr2 = kmap_atomic(p2); | |
3ecb01df JB |
2725 | copy_page(buf, kaddr1); |
2726 | copy_page(kaddr1, kaddr2); | |
2727 | copy_page(kaddr2, buf); | |
0de9a1e2 CW |
2728 | kunmap_atomic(kaddr2); |
2729 | kunmap_atomic(kaddr1); | |
8357376d RW |
2730 | } |
2731 | ||
2732 | /** | |
ef96f639 RW |
2733 | * restore_highmem - Put highmem image pages into their original locations. |
2734 | * | |
2735 | * For each highmem page that was in use before hibernation and is included in | |
2736 | * the image, and also has been allocated by the "restore" kernel, swap its | |
2737 | * current contents with the previous (ie. "before hibernation") ones. | |
8357376d | 2738 | * |
ef96f639 RW |
2739 | * If the restore eventually fails, we can call this function once again and |
2740 | * restore the highmem state as seen by the restore kernel. | |
8357376d | 2741 | */ |
8357376d RW |
2742 | int restore_highmem(void) |
2743 | { | |
2744 | struct highmem_pbe *pbe = highmem_pblist; | |
2745 | void *buf; | |
2746 | ||
2747 | if (!pbe) | |
2748 | return 0; | |
2749 | ||
2750 | buf = get_image_page(GFP_ATOMIC, PG_SAFE); | |
2751 | if (!buf) | |
2752 | return -ENOMEM; | |
2753 | ||
2754 | while (pbe) { | |
2755 | swap_two_pages_data(pbe->copy_page, pbe->orig_page, buf); | |
2756 | pbe = pbe->next; | |
2757 | } | |
2758 | free_image_page(buf, PG_UNSAFE_CLEAR); | |
2759 | return 0; | |
f577eb30 | 2760 | } |
8357376d | 2761 | #endif /* CONFIG_HIGHMEM */ |