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25761b6e RW |
1 | /* |
2 | * linux/kernel/power/swsusp.c | |
3 | * | |
4 | * This file is to realize architecture-independent | |
5 | * machine suspend feature using pretty near only high-level routines | |
6 | * | |
7 | * Copyright (C) 1998-2005 Pavel Machek <pavel@suse.cz> | |
8 | * | |
9 | * This file is released under the GPLv2, and is based on swsusp.c. | |
10 | * | |
11 | */ | |
12 | ||
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/suspend.h> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/file.h> | |
19 | #include <linux/utsname.h> | |
20 | #include <linux/version.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/reboot.h> | |
23 | #include <linux/bitops.h> | |
24 | #include <linux/vt_kern.h> | |
25 | #include <linux/kbd_kern.h> | |
26 | #include <linux/keyboard.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/genhd.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/major.h> | |
31 | #include <linux/swap.h> | |
32 | #include <linux/pm.h> | |
33 | #include <linux/device.h> | |
34 | #include <linux/buffer_head.h> | |
35 | #include <linux/swapops.h> | |
36 | #include <linux/bootmem.h> | |
37 | #include <linux/syscalls.h> | |
38 | #include <linux/console.h> | |
39 | #include <linux/highmem.h> | |
40 | #include <linux/bio.h> | |
41 | #include <linux/mount.h> | |
42 | ||
43 | #include <asm/uaccess.h> | |
44 | #include <asm/mmu_context.h> | |
45 | #include <asm/pgtable.h> | |
46 | #include <asm/tlbflush.h> | |
47 | #include <asm/io.h> | |
48 | ||
49 | #include <linux/random.h> | |
50 | #include <linux/crypto.h> | |
51 | #include <asm/scatterlist.h> | |
52 | ||
53 | #include "power.h" | |
54 | ||
55 | ||
56 | ||
57 | ||
58 | #ifdef CONFIG_HIGHMEM | |
59 | struct highmem_page { | |
60 | char *data; | |
61 | struct page *page; | |
62 | struct highmem_page *next; | |
63 | }; | |
64 | ||
65 | static struct highmem_page *highmem_copy; | |
66 | ||
67 | static int save_highmem_zone(struct zone *zone) | |
68 | { | |
69 | unsigned long zone_pfn; | |
70 | mark_free_pages(zone); | |
71 | for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) { | |
72 | struct page *page; | |
73 | struct highmem_page *save; | |
74 | void *kaddr; | |
75 | unsigned long pfn = zone_pfn + zone->zone_start_pfn; | |
76 | ||
77 | if (!(pfn%1000)) | |
78 | printk("."); | |
79 | if (!pfn_valid(pfn)) | |
80 | continue; | |
81 | page = pfn_to_page(pfn); | |
82 | /* | |
83 | * This condition results from rvmalloc() sans vmalloc_32() | |
84 | * and architectural memory reservations. This should be | |
85 | * corrected eventually when the cases giving rise to this | |
86 | * are better understood. | |
87 | */ | |
88 | if (PageReserved(page)) { | |
89 | printk("highmem reserved page?!\n"); | |
90 | continue; | |
91 | } | |
92 | BUG_ON(PageNosave(page)); | |
93 | if (PageNosaveFree(page)) | |
94 | continue; | |
95 | save = kmalloc(sizeof(struct highmem_page), GFP_ATOMIC); | |
96 | if (!save) | |
97 | return -ENOMEM; | |
98 | save->next = highmem_copy; | |
99 | save->page = page; | |
100 | save->data = (void *) get_zeroed_page(GFP_ATOMIC); | |
101 | if (!save->data) { | |
102 | kfree(save); | |
103 | return -ENOMEM; | |
104 | } | |
105 | kaddr = kmap_atomic(page, KM_USER0); | |
106 | memcpy(save->data, kaddr, PAGE_SIZE); | |
107 | kunmap_atomic(kaddr, KM_USER0); | |
108 | highmem_copy = save; | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | #endif /* CONFIG_HIGHMEM */ | |
113 | ||
114 | ||
115 | static int save_highmem(void) | |
116 | { | |
117 | #ifdef CONFIG_HIGHMEM | |
118 | struct zone *zone; | |
119 | int res = 0; | |
120 | ||
121 | pr_debug("swsusp: Saving Highmem\n"); | |
122 | for_each_zone (zone) { | |
123 | if (is_highmem(zone)) | |
124 | res = save_highmem_zone(zone); | |
125 | if (res) | |
126 | return res; | |
127 | } | |
128 | #endif | |
129 | return 0; | |
130 | } | |
131 | ||
132 | int restore_highmem(void) | |
133 | { | |
134 | #ifdef CONFIG_HIGHMEM | |
135 | printk("swsusp: Restoring Highmem\n"); | |
136 | while (highmem_copy) { | |
137 | struct highmem_page *save = highmem_copy; | |
138 | void *kaddr; | |
139 | highmem_copy = save->next; | |
140 | ||
141 | kaddr = kmap_atomic(save->page, KM_USER0); | |
142 | memcpy(kaddr, save->data, PAGE_SIZE); | |
143 | kunmap_atomic(kaddr, KM_USER0); | |
144 | free_page((long) save->data); | |
145 | kfree(save); | |
146 | } | |
147 | #endif | |
148 | return 0; | |
149 | } | |
150 | ||
151 | ||
152 | static int pfn_is_nosave(unsigned long pfn) | |
153 | { | |
154 | unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT; | |
155 | unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT; | |
156 | return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn); | |
157 | } | |
158 | ||
159 | /** | |
160 | * saveable - Determine whether a page should be cloned or not. | |
161 | * @pfn: The page | |
162 | * | |
163 | * We save a page if it's Reserved, and not in the range of pages | |
164 | * statically defined as 'unsaveable', or if it isn't reserved, and | |
165 | * isn't part of a free chunk of pages. | |
166 | */ | |
167 | ||
168 | static int saveable(struct zone * zone, unsigned long * zone_pfn) | |
169 | { | |
170 | unsigned long pfn = *zone_pfn + zone->zone_start_pfn; | |
171 | struct page * page; | |
172 | ||
173 | if (!pfn_valid(pfn)) | |
174 | return 0; | |
175 | ||
176 | page = pfn_to_page(pfn); | |
177 | BUG_ON(PageReserved(page) && PageNosave(page)); | |
178 | if (PageNosave(page)) | |
179 | return 0; | |
180 | if (PageReserved(page) && pfn_is_nosave(pfn)) { | |
181 | pr_debug("[nosave pfn 0x%lx]", pfn); | |
182 | return 0; | |
183 | } | |
184 | if (PageNosaveFree(page)) | |
185 | return 0; | |
186 | ||
187 | return 1; | |
188 | } | |
189 | ||
a0f49651 | 190 | static unsigned count_data_pages(void) |
25761b6e RW |
191 | { |
192 | struct zone *zone; | |
193 | unsigned long zone_pfn; | |
a0f49651 | 194 | unsigned n; |
25761b6e | 195 | |
a0f49651 | 196 | n = 0; |
25761b6e RW |
197 | for_each_zone (zone) { |
198 | if (is_highmem(zone)) | |
199 | continue; | |
200 | mark_free_pages(zone); | |
201 | for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) | |
a0f49651 | 202 | n += saveable(zone, &zone_pfn); |
25761b6e | 203 | } |
a0f49651 | 204 | return n; |
25761b6e RW |
205 | } |
206 | ||
a0f49651 | 207 | static void copy_data_pages(struct pbe *pblist) |
25761b6e RW |
208 | { |
209 | struct zone *zone; | |
210 | unsigned long zone_pfn; | |
a0f49651 | 211 | struct pbe *pbe, *p; |
25761b6e | 212 | |
a0f49651 | 213 | pbe = pblist; |
25761b6e RW |
214 | for_each_zone (zone) { |
215 | if (is_highmem(zone)) | |
216 | continue; | |
217 | mark_free_pages(zone); | |
218 | /* This is necessary for swsusp_free() */ | |
a0f49651 | 219 | for_each_pb_page (p, pblist) |
25761b6e | 220 | SetPageNosaveFree(virt_to_page(p)); |
a0f49651 | 221 | for_each_pbe (p, pblist) |
25761b6e RW |
222 | SetPageNosaveFree(virt_to_page(p->address)); |
223 | for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) { | |
224 | if (saveable(zone, &zone_pfn)) { | |
225 | struct page * page; | |
226 | page = pfn_to_page(zone_pfn + zone->zone_start_pfn); | |
227 | BUG_ON(!pbe); | |
228 | pbe->orig_address = (unsigned long)page_address(page); | |
229 | /* copy_page is not usable for copying task structs. */ | |
230 | memcpy((void *)pbe->address, (void *)pbe->orig_address, PAGE_SIZE); | |
231 | pbe = pbe->next; | |
232 | } | |
233 | } | |
234 | } | |
235 | BUG_ON(pbe); | |
236 | } | |
237 | ||
238 | ||
239 | /** | |
240 | * free_pagedir - free pages allocated with alloc_pagedir() | |
241 | */ | |
242 | ||
2c1b4a5c | 243 | static void free_pagedir(struct pbe *pblist) |
25761b6e RW |
244 | { |
245 | struct pbe *pbe; | |
246 | ||
247 | while (pblist) { | |
248 | pbe = (pblist + PB_PAGE_SKIP)->next; | |
249 | ClearPageNosave(virt_to_page(pblist)); | |
250 | ClearPageNosaveFree(virt_to_page(pblist)); | |
251 | free_page((unsigned long)pblist); | |
252 | pblist = pbe; | |
253 | } | |
254 | } | |
255 | ||
256 | /** | |
257 | * fill_pb_page - Create a list of PBEs on a given memory page | |
258 | */ | |
259 | ||
260 | static inline void fill_pb_page(struct pbe *pbpage) | |
261 | { | |
262 | struct pbe *p; | |
263 | ||
264 | p = pbpage; | |
265 | pbpage += PB_PAGE_SKIP; | |
266 | do | |
267 | p->next = p + 1; | |
268 | while (++p < pbpage); | |
269 | } | |
270 | ||
271 | /** | |
272 | * create_pbe_list - Create a list of PBEs on top of a given chain | |
273 | * of memory pages allocated with alloc_pagedir() | |
274 | */ | |
275 | ||
276 | void create_pbe_list(struct pbe *pblist, unsigned nr_pages) | |
277 | { | |
278 | struct pbe *pbpage, *p; | |
279 | unsigned num = PBES_PER_PAGE; | |
280 | ||
281 | for_each_pb_page (pbpage, pblist) { | |
282 | if (num >= nr_pages) | |
283 | break; | |
284 | ||
285 | fill_pb_page(pbpage); | |
286 | num += PBES_PER_PAGE; | |
287 | } | |
288 | if (pbpage) { | |
289 | for (num -= PBES_PER_PAGE - 1, p = pbpage; num < nr_pages; p++, num++) | |
290 | p->next = p + 1; | |
291 | p->next = NULL; | |
292 | } | |
293 | pr_debug("create_pbe_list(): initialized %d PBEs\n", num); | |
294 | } | |
295 | ||
296 | static void *alloc_image_page(void) | |
297 | { | |
298 | void *res = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_COLD); | |
299 | if (res) { | |
300 | SetPageNosave(virt_to_page(res)); | |
301 | SetPageNosaveFree(virt_to_page(res)); | |
302 | } | |
303 | return res; | |
304 | } | |
305 | ||
306 | /** | |
307 | * alloc_pagedir - Allocate the page directory. | |
308 | * | |
309 | * First, determine exactly how many pages we need and | |
310 | * allocate them. | |
311 | * | |
312 | * We arrange the pages in a chain: each page is an array of PBES_PER_PAGE | |
313 | * struct pbe elements (pbes) and the last element in the page points | |
314 | * to the next page. | |
315 | * | |
316 | * On each page we set up a list of struct_pbe elements. | |
317 | */ | |
318 | ||
319 | struct pbe * alloc_pagedir(unsigned nr_pages) | |
320 | { | |
321 | unsigned num; | |
322 | struct pbe *pblist, *pbe; | |
323 | ||
324 | if (!nr_pages) | |
325 | return NULL; | |
326 | ||
327 | pr_debug("alloc_pagedir(): nr_pages = %d\n", nr_pages); | |
328 | pblist = (struct pbe *)alloc_image_page(); | |
329 | /* FIXME: rewrite this ugly loop */ | |
330 | for (pbe = pblist, num = PBES_PER_PAGE; pbe && num < nr_pages; | |
331 | pbe = pbe->next, num += PBES_PER_PAGE) { | |
332 | pbe += PB_PAGE_SKIP; | |
333 | pbe->next = (struct pbe *)alloc_image_page(); | |
334 | } | |
335 | if (!pbe) { /* get_zeroed_page() failed */ | |
336 | free_pagedir(pblist); | |
337 | pblist = NULL; | |
338 | } | |
339 | return pblist; | |
340 | } | |
341 | ||
342 | /** | |
343 | * Free pages we allocated for suspend. Suspend pages are alocated | |
344 | * before atomic copy, so we need to free them after resume. | |
345 | */ | |
346 | ||
347 | void swsusp_free(void) | |
348 | { | |
349 | struct zone *zone; | |
350 | unsigned long zone_pfn; | |
351 | ||
352 | for_each_zone(zone) { | |
353 | for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) | |
354 | if (pfn_valid(zone_pfn + zone->zone_start_pfn)) { | |
355 | struct page * page; | |
356 | page = pfn_to_page(zone_pfn + zone->zone_start_pfn); | |
357 | if (PageNosave(page) && PageNosaveFree(page)) { | |
358 | ClearPageNosave(page); | |
359 | ClearPageNosaveFree(page); | |
360 | free_page((long) page_address(page)); | |
361 | } | |
362 | } | |
363 | } | |
364 | } | |
365 | ||
366 | ||
367 | /** | |
368 | * enough_free_mem - Make sure we enough free memory to snapshot. | |
369 | * | |
370 | * Returns TRUE or FALSE after checking the number of available | |
371 | * free pages. | |
372 | */ | |
373 | ||
a0f49651 | 374 | static int enough_free_mem(unsigned nr_pages) |
25761b6e RW |
375 | { |
376 | pr_debug("swsusp: available memory: %u pages\n", nr_free_pages()); | |
a0f49651 RW |
377 | return nr_free_pages() > (nr_pages + PAGES_FOR_IO + |
378 | (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE); | |
25761b6e RW |
379 | } |
380 | ||
381 | ||
a0f49651 | 382 | static struct pbe *swsusp_alloc(unsigned nr_pages) |
25761b6e | 383 | { |
a0f49651 | 384 | struct pbe *pblist, *p; |
25761b6e | 385 | |
a0f49651 | 386 | if (!(pblist = alloc_pagedir(nr_pages))) { |
25761b6e | 387 | printk(KERN_ERR "suspend: Allocating pagedir failed.\n"); |
a0f49651 | 388 | return NULL; |
25761b6e | 389 | } |
a0f49651 | 390 | create_pbe_list(pblist, nr_pages); |
25761b6e | 391 | |
a0f49651 | 392 | for_each_pbe (p, pblist) { |
25761b6e RW |
393 | p->address = (unsigned long)alloc_image_page(); |
394 | if (!p->address) { | |
395 | printk(KERN_ERR "suspend: Allocating image pages failed.\n"); | |
396 | swsusp_free(); | |
a0f49651 | 397 | return NULL; |
25761b6e RW |
398 | } |
399 | } | |
400 | ||
a0f49651 | 401 | return pblist; |
25761b6e RW |
402 | } |
403 | ||
404 | static int suspend_prepare_image(void) | |
405 | { | |
a0f49651 | 406 | unsigned nr_pages; |
25761b6e RW |
407 | |
408 | pr_debug("swsusp: critical section: \n"); | |
409 | if (save_highmem()) { | |
410 | printk(KERN_CRIT "swsusp: Not enough free pages for highmem\n"); | |
411 | restore_highmem(); | |
412 | return -ENOMEM; | |
413 | } | |
414 | ||
415 | drain_local_pages(); | |
a0f49651 RW |
416 | nr_pages = count_data_pages(); |
417 | printk("swsusp: Need to copy %u pages\n", nr_pages); | |
25761b6e RW |
418 | |
419 | pr_debug("swsusp: pages needed: %u + %lu + %u, free: %u\n", | |
a0f49651 RW |
420 | nr_pages, |
421 | (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE, | |
25761b6e RW |
422 | PAGES_FOR_IO, nr_free_pages()); |
423 | ||
a0f49651 RW |
424 | /* This is needed because of the fixed size of swsusp_info */ |
425 | if (MAX_PBES < (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE) | |
426 | return -ENOSPC; | |
427 | ||
428 | if (!enough_free_mem(nr_pages)) { | |
25761b6e RW |
429 | printk(KERN_ERR "swsusp: Not enough free memory\n"); |
430 | return -ENOMEM; | |
431 | } | |
432 | ||
a0f49651 | 433 | if (!enough_swap(nr_pages)) { |
25761b6e RW |
434 | printk(KERN_ERR "swsusp: Not enough free swap\n"); |
435 | return -ENOSPC; | |
436 | } | |
437 | ||
a0f49651 RW |
438 | pagedir_nosave = swsusp_alloc(nr_pages); |
439 | if (!pagedir_nosave) | |
440 | return -ENOMEM; | |
25761b6e RW |
441 | |
442 | /* During allocating of suspend pagedir, new cold pages may appear. | |
443 | * Kill them. | |
444 | */ | |
445 | drain_local_pages(); | |
a0f49651 | 446 | copy_data_pages(pagedir_nosave); |
25761b6e RW |
447 | |
448 | /* | |
449 | * End of critical section. From now on, we can write to memory, | |
450 | * but we should not touch disk. This specially means we must _not_ | |
451 | * touch swap space! Except we must write out our image of course. | |
452 | */ | |
453 | ||
a0f49651 RW |
454 | nr_copy_pages = nr_pages; |
455 | ||
456 | printk("swsusp: critical section/: done (%d pages copied)\n", nr_pages); | |
25761b6e RW |
457 | return 0; |
458 | } | |
459 | ||
460 | ||
461 | asmlinkage int swsusp_save(void) | |
462 | { | |
463 | return suspend_prepare_image(); | |
464 | } |