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1da177e4 LT |
1 | /* |
2 | * kernel/power/disk.c - Suspend-to-disk support. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * Copyright (c) 2004 Pavel Machek <pavel@suse.cz> | |
7 | * | |
8 | * This file is released under the GPLv2. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/suspend.h> | |
13 | #include <linux/syscalls.h> | |
14 | #include <linux/reboot.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/fs.h> | |
d53d9f16 | 19 | #include <linux/mount.h> |
88d10bba | 20 | #include <linux/pm.h> |
d53d9f16 | 21 | |
1da177e4 LT |
22 | #include "power.h" |
23 | ||
24 | ||
25 | extern suspend_disk_method_t pm_disk_mode; | |
1da177e4 | 26 | |
72a97e08 | 27 | extern int swsusp_shrink_memory(void); |
1da177e4 | 28 | extern int swsusp_suspend(void); |
7088a5c0 | 29 | extern int swsusp_write(struct pbe *pblist, unsigned int nr_pages); |
1da177e4 | 30 | extern int swsusp_check(void); |
7088a5c0 | 31 | extern int swsusp_read(struct pbe **pblist_ptr); |
1da177e4 LT |
32 | extern void swsusp_close(void); |
33 | extern int swsusp_resume(void); | |
1da177e4 LT |
34 | |
35 | ||
36 | static int noresume = 0; | |
37 | char resume_file[256] = CONFIG_PM_STD_PARTITION; | |
38 | dev_t swsusp_resume_device; | |
39 | ||
40 | /** | |
41 | * power_down - Shut machine down for hibernate. | |
42 | * @mode: Suspend-to-disk mode | |
43 | * | |
44 | * Use the platform driver, if configured so, and return gracefully if it | |
45 | * fails. | |
46 | * Otherwise, try to power off and reboot. If they fail, halt the machine, | |
47 | * there ain't no turning back. | |
48 | */ | |
49 | ||
50 | static void power_down(suspend_disk_method_t mode) | |
51 | { | |
1da177e4 LT |
52 | int error = 0; |
53 | ||
1da177e4 LT |
54 | switch(mode) { |
55 | case PM_DISK_PLATFORM: | |
88d10bba | 56 | kernel_power_off_prepare(); |
1da177e4 LT |
57 | error = pm_ops->enter(PM_SUSPEND_DISK); |
58 | break; | |
59 | case PM_DISK_SHUTDOWN: | |
fdde86ac | 60 | kernel_power_off(); |
1da177e4 LT |
61 | break; |
62 | case PM_DISK_REBOOT: | |
fdde86ac | 63 | kernel_restart(NULL); |
1da177e4 LT |
64 | break; |
65 | } | |
fdde86ac | 66 | kernel_halt(); |
1da177e4 LT |
67 | /* Valid image is on the disk, if we continue we risk serious data corruption |
68 | after resume. */ | |
69 | printk(KERN_CRIT "Please power me down manually\n"); | |
70 | while(1); | |
71 | } | |
72 | ||
73 | ||
74 | static int in_suspend __nosavedata = 0; | |
75 | ||
76 | ||
1da177e4 LT |
77 | static inline void platform_finish(void) |
78 | { | |
79 | if (pm_disk_mode == PM_DISK_PLATFORM) { | |
80 | if (pm_ops && pm_ops->finish) | |
81 | pm_ops->finish(PM_SUSPEND_DISK); | |
82 | } | |
83 | } | |
84 | ||
1da177e4 LT |
85 | static int prepare_processes(void) |
86 | { | |
87 | int error; | |
88 | ||
89 | pm_prepare_console(); | |
1da177e4 | 90 | sys_sync(); |
5a72e04d LS |
91 | disable_nonboot_cpus(); |
92 | ||
1da177e4 LT |
93 | if (freeze_processes()) { |
94 | error = -EBUSY; | |
5a72e04d | 95 | goto thaw; |
1da177e4 LT |
96 | } |
97 | ||
98 | if (pm_disk_mode == PM_DISK_PLATFORM) { | |
99 | if (pm_ops && pm_ops->prepare) { | |
100 | if ((error = pm_ops->prepare(PM_SUSPEND_DISK))) | |
5a72e04d | 101 | goto thaw; |
1da177e4 LT |
102 | } |
103 | } | |
104 | ||
105 | /* Free memory before shutting down devices. */ | |
72a97e08 RW |
106 | if (!(error = swsusp_shrink_memory())) |
107 | return 0; | |
5a72e04d LS |
108 | thaw: |
109 | thaw_processes(); | |
110 | enable_nonboot_cpus(); | |
111 | pm_restore_console(); | |
112 | return error; | |
1da177e4 LT |
113 | } |
114 | ||
115 | static void unprepare_processes(void) | |
116 | { | |
5a72e04d | 117 | platform_finish(); |
1da177e4 | 118 | thaw_processes(); |
5a72e04d | 119 | enable_nonboot_cpus(); |
1da177e4 LT |
120 | pm_restore_console(); |
121 | } | |
122 | ||
1da177e4 LT |
123 | /** |
124 | * pm_suspend_disk - The granpappy of power management. | |
125 | * | |
126 | * If we're going through the firmware, then get it over with quickly. | |
127 | * | |
128 | * If not, then call swsusp to do its thing, then figure out how | |
129 | * to power down the system. | |
130 | */ | |
131 | ||
132 | int pm_suspend_disk(void) | |
133 | { | |
134 | int error; | |
135 | ||
136 | error = prepare_processes(); | |
5a72e04d LS |
137 | if (error) |
138 | return error; | |
1da177e4 | 139 | |
99dc7d63 | 140 | error = device_suspend(PMSG_FREEZE); |
1da177e4 | 141 | if (error) { |
99dc7d63 | 142 | printk("Some devices failed to suspend\n"); |
1da177e4 LT |
143 | unprepare_processes(); |
144 | return error; | |
145 | } | |
146 | ||
1da177e4 LT |
147 | pr_debug("PM: snapshotting memory.\n"); |
148 | in_suspend = 1; | |
149 | if ((error = swsusp_suspend())) | |
150 | goto Done; | |
151 | ||
152 | if (in_suspend) { | |
0245b3e7 | 153 | device_resume(); |
1da177e4 | 154 | pr_debug("PM: writing image.\n"); |
7088a5c0 | 155 | error = swsusp_write(pagedir_nosave, nr_copy_pages); |
1da177e4 LT |
156 | if (!error) |
157 | power_down(pm_disk_mode); | |
99dc7d63 | 158 | else { |
99dc7d63 PM |
159 | swsusp_free(); |
160 | unprepare_processes(); | |
161 | return error; | |
162 | } | |
1da177e4 LT |
163 | } else |
164 | pr_debug("PM: Image restored successfully.\n"); | |
99dc7d63 | 165 | |
1da177e4 LT |
166 | swsusp_free(); |
167 | Done: | |
99dc7d63 PM |
168 | device_resume(); |
169 | unprepare_processes(); | |
1da177e4 LT |
170 | return error; |
171 | } | |
172 | ||
173 | ||
174 | /** | |
175 | * software_resume - Resume from a saved image. | |
176 | * | |
177 | * Called as a late_initcall (so all devices are discovered and | |
178 | * initialized), we call swsusp to see if we have a saved image or not. | |
179 | * If so, we quiesce devices, the restore the saved image. We will | |
180 | * return above (in pm_suspend_disk() ) if everything goes well. | |
181 | * Otherwise, we fail gracefully and return to the normally | |
182 | * scheduled program. | |
183 | * | |
184 | */ | |
185 | ||
186 | static int software_resume(void) | |
187 | { | |
188 | int error; | |
189 | ||
dd5d666b | 190 | down(&pm_sem); |
3efa147a | 191 | if (!swsusp_resume_device) { |
dd5d666b SL |
192 | if (!strlen(resume_file)) { |
193 | up(&pm_sem); | |
3efa147a | 194 | return -ENOENT; |
dd5d666b | 195 | } |
3efa147a PM |
196 | swsusp_resume_device = name_to_dev_t(resume_file); |
197 | pr_debug("swsusp: Resume From Partition %s\n", resume_file); | |
198 | } else { | |
199 | pr_debug("swsusp: Resume From Partition %d:%d\n", | |
200 | MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); | |
201 | } | |
202 | ||
1da177e4 LT |
203 | if (noresume) { |
204 | /** | |
205 | * FIXME: If noresume is specified, we need to find the partition | |
206 | * and reset it back to normal swap space. | |
207 | */ | |
dd5d666b | 208 | up(&pm_sem); |
1da177e4 LT |
209 | return 0; |
210 | } | |
211 | ||
212 | pr_debug("PM: Checking swsusp image.\n"); | |
213 | ||
214 | if ((error = swsusp_check())) | |
215 | goto Done; | |
216 | ||
217 | pr_debug("PM: Preparing processes for restore.\n"); | |
218 | ||
219 | if ((error = prepare_processes())) { | |
220 | swsusp_close(); | |
5a72e04d | 221 | goto Done; |
1da177e4 LT |
222 | } |
223 | ||
224 | pr_debug("PM: Reading swsusp image.\n"); | |
225 | ||
7088a5c0 | 226 | if ((error = swsusp_read(&pagedir_nosave))) { |
2c1b4a5c RW |
227 | swsusp_free(); |
228 | goto Thaw; | |
229 | } | |
1da177e4 LT |
230 | |
231 | pr_debug("PM: Preparing devices for restore.\n"); | |
232 | ||
99dc7d63 PM |
233 | if ((error = device_suspend(PMSG_FREEZE))) { |
234 | printk("Some devices failed to suspend\n"); | |
2c1b4a5c RW |
235 | swsusp_free(); |
236 | goto Thaw; | |
99dc7d63 | 237 | } |
1da177e4 LT |
238 | |
239 | mb(); | |
240 | ||
241 | pr_debug("PM: Restoring saved image.\n"); | |
242 | swsusp_resume(); | |
243 | pr_debug("PM: Restore failed, recovering.n"); | |
99dc7d63 | 244 | device_resume(); |
2c1b4a5c | 245 | Thaw: |
1da177e4 LT |
246 | unprepare_processes(); |
247 | Done: | |
dd5d666b SL |
248 | /* For success case, the suspend path will release the lock */ |
249 | up(&pm_sem); | |
1da177e4 LT |
250 | pr_debug("PM: Resume from disk failed.\n"); |
251 | return 0; | |
252 | } | |
253 | ||
254 | late_initcall(software_resume); | |
255 | ||
256 | ||
257 | static char * pm_disk_modes[] = { | |
258 | [PM_DISK_FIRMWARE] = "firmware", | |
259 | [PM_DISK_PLATFORM] = "platform", | |
260 | [PM_DISK_SHUTDOWN] = "shutdown", | |
261 | [PM_DISK_REBOOT] = "reboot", | |
262 | }; | |
263 | ||
264 | /** | |
265 | * disk - Control suspend-to-disk mode | |
266 | * | |
267 | * Suspend-to-disk can be handled in several ways. The greatest | |
268 | * distinction is who writes memory to disk - the firmware or the OS. | |
269 | * If the firmware does it, we assume that it also handles suspending | |
270 | * the system. | |
271 | * If the OS does it, then we have three options for putting the system | |
272 | * to sleep - using the platform driver (e.g. ACPI or other PM registers), | |
273 | * powering off the system or rebooting the system (for testing). | |
274 | * | |
275 | * The system will support either 'firmware' or 'platform', and that is | |
276 | * known a priori (and encoded in pm_ops). But, the user may choose | |
277 | * 'shutdown' or 'reboot' as alternatives. | |
278 | * | |
279 | * show() will display what the mode is currently set to. | |
280 | * store() will accept one of | |
281 | * | |
282 | * 'firmware' | |
283 | * 'platform' | |
284 | * 'shutdown' | |
285 | * 'reboot' | |
286 | * | |
287 | * It will only change to 'firmware' or 'platform' if the system | |
288 | * supports it (as determined from pm_ops->pm_disk_mode). | |
289 | */ | |
290 | ||
291 | static ssize_t disk_show(struct subsystem * subsys, char * buf) | |
292 | { | |
293 | return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]); | |
294 | } | |
295 | ||
296 | ||
297 | static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n) | |
298 | { | |
299 | int error = 0; | |
300 | int i; | |
301 | int len; | |
302 | char *p; | |
303 | suspend_disk_method_t mode = 0; | |
304 | ||
305 | p = memchr(buf, '\n', n); | |
306 | len = p ? p - buf : n; | |
307 | ||
308 | down(&pm_sem); | |
309 | for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) { | |
310 | if (!strncmp(buf, pm_disk_modes[i], len)) { | |
311 | mode = i; | |
312 | break; | |
313 | } | |
314 | } | |
315 | if (mode) { | |
316 | if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT) | |
317 | pm_disk_mode = mode; | |
318 | else { | |
319 | if (pm_ops && pm_ops->enter && | |
320 | (mode == pm_ops->pm_disk_mode)) | |
321 | pm_disk_mode = mode; | |
322 | else | |
323 | error = -EINVAL; | |
324 | } | |
325 | } else | |
326 | error = -EINVAL; | |
327 | ||
328 | pr_debug("PM: suspend-to-disk mode set to '%s'\n", | |
329 | pm_disk_modes[mode]); | |
330 | up(&pm_sem); | |
331 | return error ? error : n; | |
332 | } | |
333 | ||
334 | power_attr(disk); | |
335 | ||
336 | static ssize_t resume_show(struct subsystem * subsys, char *buf) | |
337 | { | |
338 | return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device), | |
339 | MINOR(swsusp_resume_device)); | |
340 | } | |
341 | ||
a576219a | 342 | static ssize_t resume_store(struct subsystem *subsys, const char *buf, size_t n) |
1da177e4 | 343 | { |
1da177e4 | 344 | unsigned int maj, min; |
1da177e4 | 345 | dev_t res; |
a576219a | 346 | int ret = -EINVAL; |
1da177e4 | 347 | |
a576219a AM |
348 | if (sscanf(buf, "%u:%u", &maj, &min) != 2) |
349 | goto out; | |
1da177e4 | 350 | |
a576219a AM |
351 | res = MKDEV(maj,min); |
352 | if (maj != MAJOR(res) || min != MINOR(res)) | |
353 | goto out; | |
1da177e4 | 354 | |
a576219a AM |
355 | down(&pm_sem); |
356 | swsusp_resume_device = res; | |
357 | up(&pm_sem); | |
358 | printk("Attempting manual resume\n"); | |
359 | noresume = 0; | |
360 | software_resume(); | |
361 | ret = n; | |
362 | out: | |
363 | return ret; | |
1da177e4 LT |
364 | } |
365 | ||
366 | power_attr(resume); | |
367 | ||
368 | static struct attribute * g[] = { | |
369 | &disk_attr.attr, | |
370 | &resume_attr.attr, | |
371 | NULL, | |
372 | }; | |
373 | ||
374 | ||
375 | static struct attribute_group attr_group = { | |
376 | .attrs = g, | |
377 | }; | |
378 | ||
379 | ||
380 | static int __init pm_disk_init(void) | |
381 | { | |
382 | return sysfs_create_group(&power_subsys.kset.kobj,&attr_group); | |
383 | } | |
384 | ||
385 | core_initcall(pm_disk_init); | |
386 | ||
387 | ||
388 | static int __init resume_setup(char *str) | |
389 | { | |
390 | if (noresume) | |
391 | return 1; | |
392 | ||
393 | strncpy( resume_file, str, 255 ); | |
394 | return 1; | |
395 | } | |
396 | ||
397 | static int __init noresume_setup(char *str) | |
398 | { | |
399 | noresume = 1; | |
400 | return 1; | |
401 | } | |
402 | ||
403 | __setup("noresume", noresume_setup); | |
404 | __setup("resume=", resume_setup); |