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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 | ||
190 | static void count_data_pages(void) | |
191 | { | |
192 | struct zone *zone; | |
193 | unsigned long zone_pfn; | |
194 | ||
195 | nr_copy_pages = 0; | |
196 | ||
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) | |
202 | nr_copy_pages += saveable(zone, &zone_pfn); | |
203 | } | |
204 | } | |
205 | ||
206 | static void copy_data_pages(void) | |
207 | { | |
208 | struct zone *zone; | |
209 | unsigned long zone_pfn; | |
210 | struct pbe *pbe = pagedir_nosave, *p; | |
211 | ||
212 | pr_debug("copy_data_pages(): pages to copy: %d\n", nr_copy_pages); | |
213 | for_each_zone (zone) { | |
214 | if (is_highmem(zone)) | |
215 | continue; | |
216 | mark_free_pages(zone); | |
217 | /* This is necessary for swsusp_free() */ | |
218 | for_each_pb_page (p, pagedir_nosave) | |
219 | SetPageNosaveFree(virt_to_page(p)); | |
220 | for_each_pbe(p, pagedir_nosave) | |
221 | SetPageNosaveFree(virt_to_page(p->address)); | |
222 | for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) { | |
223 | if (saveable(zone, &zone_pfn)) { | |
224 | struct page * page; | |
225 | page = pfn_to_page(zone_pfn + zone->zone_start_pfn); | |
226 | BUG_ON(!pbe); | |
227 | pbe->orig_address = (unsigned long)page_address(page); | |
228 | /* copy_page is not usable for copying task structs. */ | |
229 | memcpy((void *)pbe->address, (void *)pbe->orig_address, PAGE_SIZE); | |
230 | pbe = pbe->next; | |
231 | } | |
232 | } | |
233 | } | |
234 | BUG_ON(pbe); | |
235 | } | |
236 | ||
237 | ||
238 | /** | |
239 | * free_pagedir - free pages allocated with alloc_pagedir() | |
240 | */ | |
241 | ||
242 | void free_pagedir(struct pbe *pblist) | |
243 | { | |
244 | struct pbe *pbe; | |
245 | ||
246 | while (pblist) { | |
247 | pbe = (pblist + PB_PAGE_SKIP)->next; | |
248 | ClearPageNosave(virt_to_page(pblist)); | |
249 | ClearPageNosaveFree(virt_to_page(pblist)); | |
250 | free_page((unsigned long)pblist); | |
251 | pblist = pbe; | |
252 | } | |
253 | } | |
254 | ||
255 | /** | |
256 | * fill_pb_page - Create a list of PBEs on a given memory page | |
257 | */ | |
258 | ||
259 | static inline void fill_pb_page(struct pbe *pbpage) | |
260 | { | |
261 | struct pbe *p; | |
262 | ||
263 | p = pbpage; | |
264 | pbpage += PB_PAGE_SKIP; | |
265 | do | |
266 | p->next = p + 1; | |
267 | while (++p < pbpage); | |
268 | } | |
269 | ||
270 | /** | |
271 | * create_pbe_list - Create a list of PBEs on top of a given chain | |
272 | * of memory pages allocated with alloc_pagedir() | |
273 | */ | |
274 | ||
275 | void create_pbe_list(struct pbe *pblist, unsigned nr_pages) | |
276 | { | |
277 | struct pbe *pbpage, *p; | |
278 | unsigned num = PBES_PER_PAGE; | |
279 | ||
280 | for_each_pb_page (pbpage, pblist) { | |
281 | if (num >= nr_pages) | |
282 | break; | |
283 | ||
284 | fill_pb_page(pbpage); | |
285 | num += PBES_PER_PAGE; | |
286 | } | |
287 | if (pbpage) { | |
288 | for (num -= PBES_PER_PAGE - 1, p = pbpage; num < nr_pages; p++, num++) | |
289 | p->next = p + 1; | |
290 | p->next = NULL; | |
291 | } | |
292 | pr_debug("create_pbe_list(): initialized %d PBEs\n", num); | |
293 | } | |
294 | ||
295 | static void *alloc_image_page(void) | |
296 | { | |
297 | void *res = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_COLD); | |
298 | if (res) { | |
299 | SetPageNosave(virt_to_page(res)); | |
300 | SetPageNosaveFree(virt_to_page(res)); | |
301 | } | |
302 | return res; | |
303 | } | |
304 | ||
305 | /** | |
306 | * alloc_pagedir - Allocate the page directory. | |
307 | * | |
308 | * First, determine exactly how many pages we need and | |
309 | * allocate them. | |
310 | * | |
311 | * We arrange the pages in a chain: each page is an array of PBES_PER_PAGE | |
312 | * struct pbe elements (pbes) and the last element in the page points | |
313 | * to the next page. | |
314 | * | |
315 | * On each page we set up a list of struct_pbe elements. | |
316 | */ | |
317 | ||
318 | struct pbe * alloc_pagedir(unsigned nr_pages) | |
319 | { | |
320 | unsigned num; | |
321 | struct pbe *pblist, *pbe; | |
322 | ||
323 | if (!nr_pages) | |
324 | return NULL; | |
325 | ||
326 | pr_debug("alloc_pagedir(): nr_pages = %d\n", nr_pages); | |
327 | pblist = (struct pbe *)alloc_image_page(); | |
328 | /* FIXME: rewrite this ugly loop */ | |
329 | for (pbe = pblist, num = PBES_PER_PAGE; pbe && num < nr_pages; | |
330 | pbe = pbe->next, num += PBES_PER_PAGE) { | |
331 | pbe += PB_PAGE_SKIP; | |
332 | pbe->next = (struct pbe *)alloc_image_page(); | |
333 | } | |
334 | if (!pbe) { /* get_zeroed_page() failed */ | |
335 | free_pagedir(pblist); | |
336 | pblist = NULL; | |
337 | } | |
338 | return pblist; | |
339 | } | |
340 | ||
341 | /** | |
342 | * Free pages we allocated for suspend. Suspend pages are alocated | |
343 | * before atomic copy, so we need to free them after resume. | |
344 | */ | |
345 | ||
346 | void swsusp_free(void) | |
347 | { | |
348 | struct zone *zone; | |
349 | unsigned long zone_pfn; | |
350 | ||
351 | for_each_zone(zone) { | |
352 | for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) | |
353 | if (pfn_valid(zone_pfn + zone->zone_start_pfn)) { | |
354 | struct page * page; | |
355 | page = pfn_to_page(zone_pfn + zone->zone_start_pfn); | |
356 | if (PageNosave(page) && PageNosaveFree(page)) { | |
357 | ClearPageNosave(page); | |
358 | ClearPageNosaveFree(page); | |
359 | free_page((long) page_address(page)); | |
360 | } | |
361 | } | |
362 | } | |
363 | } | |
364 | ||
365 | ||
366 | /** | |
367 | * enough_free_mem - Make sure we enough free memory to snapshot. | |
368 | * | |
369 | * Returns TRUE or FALSE after checking the number of available | |
370 | * free pages. | |
371 | */ | |
372 | ||
373 | static int enough_free_mem(void) | |
374 | { | |
375 | pr_debug("swsusp: available memory: %u pages\n", nr_free_pages()); | |
376 | return nr_free_pages() > (nr_copy_pages + PAGES_FOR_IO + | |
377 | nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE)); | |
378 | } | |
379 | ||
380 | ||
381 | static int swsusp_alloc(void) | |
382 | { | |
383 | struct pbe * p; | |
384 | ||
385 | pagedir_nosave = NULL; | |
386 | ||
387 | if (MAX_PBES < nr_copy_pages / PBES_PER_PAGE + | |
388 | !!(nr_copy_pages % PBES_PER_PAGE)) | |
389 | return -ENOSPC; | |
390 | ||
391 | if (!(pagedir_save = alloc_pagedir(nr_copy_pages))) { | |
392 | printk(KERN_ERR "suspend: Allocating pagedir failed.\n"); | |
393 | return -ENOMEM; | |
394 | } | |
395 | create_pbe_list(pagedir_save, nr_copy_pages); | |
396 | pagedir_nosave = pagedir_save; | |
397 | ||
398 | for_each_pbe (p, pagedir_save) { | |
399 | p->address = (unsigned long)alloc_image_page(); | |
400 | if (!p->address) { | |
401 | printk(KERN_ERR "suspend: Allocating image pages failed.\n"); | |
402 | swsusp_free(); | |
403 | return -ENOMEM; | |
404 | } | |
405 | } | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | static int suspend_prepare_image(void) | |
411 | { | |
412 | int error; | |
413 | ||
414 | pr_debug("swsusp: critical section: \n"); | |
415 | if (save_highmem()) { | |
416 | printk(KERN_CRIT "swsusp: Not enough free pages for highmem\n"); | |
417 | restore_highmem(); | |
418 | return -ENOMEM; | |
419 | } | |
420 | ||
421 | drain_local_pages(); | |
422 | count_data_pages(); | |
423 | printk("swsusp: Need to copy %u pages\n", nr_copy_pages); | |
424 | ||
425 | pr_debug("swsusp: pages needed: %u + %lu + %u, free: %u\n", | |
426 | nr_copy_pages, | |
427 | nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE), | |
428 | PAGES_FOR_IO, nr_free_pages()); | |
429 | ||
430 | if (!enough_free_mem()) { | |
431 | printk(KERN_ERR "swsusp: Not enough free memory\n"); | |
432 | return -ENOMEM; | |
433 | } | |
434 | ||
435 | if (!enough_swap()) { | |
436 | printk(KERN_ERR "swsusp: Not enough free swap\n"); | |
437 | return -ENOSPC; | |
438 | } | |
439 | ||
440 | error = swsusp_alloc(); | |
441 | if (error) | |
442 | return error; | |
443 | ||
444 | /* During allocating of suspend pagedir, new cold pages may appear. | |
445 | * Kill them. | |
446 | */ | |
447 | drain_local_pages(); | |
448 | copy_data_pages(); | |
449 | ||
450 | /* | |
451 | * End of critical section. From now on, we can write to memory, | |
452 | * but we should not touch disk. This specially means we must _not_ | |
453 | * touch swap space! Except we must write out our image of course. | |
454 | */ | |
455 | ||
456 | printk("swsusp: critical section/: done (%d pages copied)\n", nr_copy_pages ); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | ||
461 | asmlinkage int swsusp_save(void) | |
462 | { | |
463 | return suspend_prepare_image(); | |
464 | } |