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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * Copyright (c) Nokia Corporation, 2007 | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * Author: Artem Bityutskiy (Битюцкий Артём), | |
20 | * Frank Haverkamp | |
21 | */ | |
22 | ||
23 | /* | |
9f961b57 AB |
24 | * This file includes UBI initialization and building of UBI devices. |
25 | * | |
26 | * When UBI is initialized, it attaches all the MTD devices specified as the | |
27 | * module load parameters or the kernel boot parameters. If MTD devices were | |
28 | * specified, UBI does not attach any MTD device, but it is possible to do | |
29 | * later using the "UBI control device". | |
30 | * | |
31 | * At the moment we only attach UBI devices by scanning, which will become a | |
32 | * bottleneck when flashes reach certain large size. Then one may improve UBI | |
33 | * and add other methods, although it does not seem to be easy to do. | |
801c135c AB |
34 | */ |
35 | ||
36 | #include <linux/err.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/moduleparam.h> | |
39 | #include <linux/stringify.h> | |
f9b0080e | 40 | #include <linux/namei.h> |
801c135c | 41 | #include <linux/stat.h> |
9f961b57 | 42 | #include <linux/miscdevice.h> |
7753f169 | 43 | #include <linux/log2.h> |
cdfa788a | 44 | #include <linux/kthread.h> |
d9dd0887 | 45 | #include <linux/reboot.h> |
774b1382 | 46 | #include <linux/kernel.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
801c135c AB |
48 | #include "ubi.h" |
49 | ||
50 | /* Maximum length of the 'mtd=' parameter */ | |
51 | #define MTD_PARAM_LEN_MAX 64 | |
52 | ||
53 | /** | |
54 | * struct mtd_dev_param - MTD device parameter description data structure. | |
f9b0080e AB |
55 | * @name: MTD character device node path, MTD device name, or MTD device number |
56 | * string | |
801c135c | 57 | * @vid_hdr_offs: VID header offset |
801c135c | 58 | */ |
9c9ec147 | 59 | struct mtd_dev_param { |
801c135c AB |
60 | char name[MTD_PARAM_LEN_MAX]; |
61 | int vid_hdr_offs; | |
801c135c AB |
62 | }; |
63 | ||
64 | /* Numbers of elements set in the @mtd_dev_param array */ | |
9e0c7ef3 | 65 | static int __initdata mtd_devs; |
801c135c AB |
66 | |
67 | /* MTD devices specification parameters */ | |
9e0c7ef3 | 68 | static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES]; |
801c135c | 69 | |
801c135c AB |
70 | /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */ |
71 | struct class *ubi_class; | |
72 | ||
06b68ba1 AB |
73 | /* Slab cache for wear-leveling entries */ |
74 | struct kmem_cache *ubi_wl_entry_slab; | |
75 | ||
9f961b57 AB |
76 | /* UBI control character device */ |
77 | static struct miscdevice ubi_ctrl_cdev = { | |
78 | .minor = MISC_DYNAMIC_MINOR, | |
79 | .name = "ubi_ctrl", | |
80 | .fops = &ubi_ctrl_cdev_operations, | |
81 | }; | |
06b68ba1 | 82 | |
e73f4459 AB |
83 | /* All UBI devices in system */ |
84 | static struct ubi_device *ubi_devices[UBI_MAX_DEVICES]; | |
85 | ||
cdfa788a AB |
86 | /* Serializes UBI devices creations and removals */ |
87 | DEFINE_MUTEX(ubi_devices_mutex); | |
88 | ||
e73f4459 AB |
89 | /* Protects @ubi_devices and @ubi->ref_count */ |
90 | static DEFINE_SPINLOCK(ubi_devices_lock); | |
91 | ||
801c135c | 92 | /* "Show" method for files in '/<sysfs>/class/ubi/' */ |
28812fe1 AK |
93 | static ssize_t ubi_version_show(struct class *class, struct class_attribute *attr, |
94 | char *buf) | |
801c135c AB |
95 | { |
96 | return sprintf(buf, "%d\n", UBI_VERSION); | |
97 | } | |
98 | ||
99 | /* UBI version attribute ('/<sysfs>/class/ubi/version') */ | |
100 | static struct class_attribute ubi_version = | |
101 | __ATTR(version, S_IRUGO, ubi_version_show, NULL); | |
102 | ||
103 | static ssize_t dev_attribute_show(struct device *dev, | |
104 | struct device_attribute *attr, char *buf); | |
105 | ||
106 | /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */ | |
107 | static struct device_attribute dev_eraseblock_size = | |
108 | __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL); | |
109 | static struct device_attribute dev_avail_eraseblocks = | |
110 | __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
111 | static struct device_attribute dev_total_eraseblocks = | |
112 | __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
113 | static struct device_attribute dev_volumes_count = | |
114 | __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL); | |
115 | static struct device_attribute dev_max_ec = | |
116 | __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL); | |
117 | static struct device_attribute dev_reserved_for_bad = | |
118 | __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL); | |
119 | static struct device_attribute dev_bad_peb_count = | |
120 | __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL); | |
121 | static struct device_attribute dev_max_vol_count = | |
122 | __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL); | |
123 | static struct device_attribute dev_min_io_size = | |
124 | __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL); | |
125 | static struct device_attribute dev_bgt_enabled = | |
126 | __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL); | |
b6b76ba4 AB |
127 | static struct device_attribute dev_mtd_num = |
128 | __ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL); | |
801c135c | 129 | |
0e0ee1cc DP |
130 | /** |
131 | * ubi_volume_notify - send a volume change notification. | |
132 | * @ubi: UBI device description object | |
133 | * @vol: volume description object of the changed volume | |
134 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
135 | * | |
136 | * This is a helper function which notifies all subscribers about a volume | |
137 | * change event (creation, removal, re-sizing, re-naming, updating). Returns | |
138 | * zero in case of success and a negative error code in case of failure. | |
139 | */ | |
140 | int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype) | |
141 | { | |
142 | struct ubi_notification nt; | |
143 | ||
144 | ubi_do_get_device_info(ubi, &nt.di); | |
145 | ubi_do_get_volume_info(ubi, vol, &nt.vi); | |
146 | return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt); | |
147 | } | |
148 | ||
149 | /** | |
150 | * ubi_notify_all - send a notification to all volumes. | |
151 | * @ubi: UBI device description object | |
152 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
153 | * @nb: the notifier to call | |
154 | * | |
155 | * This function walks all volumes of UBI device @ubi and sends the @ntype | |
156 | * notification for each volume. If @nb is %NULL, then all registered notifiers | |
157 | * are called, otherwise only the @nb notifier is called. Returns the number of | |
158 | * sent notifications. | |
159 | */ | |
160 | int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb) | |
161 | { | |
162 | struct ubi_notification nt; | |
163 | int i, count = 0; | |
164 | ||
165 | ubi_do_get_device_info(ubi, &nt.di); | |
166 | ||
167 | mutex_lock(&ubi->device_mutex); | |
168 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
169 | /* | |
170 | * Since the @ubi->device is locked, and we are not going to | |
171 | * change @ubi->volumes, we do not have to lock | |
172 | * @ubi->volumes_lock. | |
173 | */ | |
174 | if (!ubi->volumes[i]) | |
175 | continue; | |
176 | ||
177 | ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi); | |
178 | if (nb) | |
179 | nb->notifier_call(nb, ntype, &nt); | |
180 | else | |
181 | blocking_notifier_call_chain(&ubi_notifiers, ntype, | |
182 | &nt); | |
183 | count += 1; | |
184 | } | |
185 | mutex_unlock(&ubi->device_mutex); | |
186 | ||
187 | return count; | |
188 | } | |
189 | ||
190 | /** | |
191 | * ubi_enumerate_volumes - send "add" notification for all existing volumes. | |
192 | * @nb: the notifier to call | |
193 | * | |
194 | * This function walks all UBI devices and volumes and sends the | |
195 | * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all | |
196 | * registered notifiers are called, otherwise only the @nb notifier is called. | |
197 | * Returns the number of sent notifications. | |
198 | */ | |
199 | int ubi_enumerate_volumes(struct notifier_block *nb) | |
200 | { | |
201 | int i, count = 0; | |
202 | ||
203 | /* | |
204 | * Since the @ubi_devices_mutex is locked, and we are not going to | |
205 | * change @ubi_devices, we do not have to lock @ubi_devices_lock. | |
206 | */ | |
207 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
208 | struct ubi_device *ubi = ubi_devices[i]; | |
209 | ||
210 | if (!ubi) | |
211 | continue; | |
212 | count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb); | |
213 | } | |
214 | ||
215 | return count; | |
216 | } | |
217 | ||
e73f4459 AB |
218 | /** |
219 | * ubi_get_device - get UBI device. | |
220 | * @ubi_num: UBI device number | |
221 | * | |
222 | * This function returns UBI device description object for UBI device number | |
223 | * @ubi_num, or %NULL if the device does not exist. This function increases the | |
224 | * device reference count to prevent removal of the device. In other words, the | |
225 | * device cannot be removed if its reference count is not zero. | |
226 | */ | |
227 | struct ubi_device *ubi_get_device(int ubi_num) | |
228 | { | |
229 | struct ubi_device *ubi; | |
230 | ||
231 | spin_lock(&ubi_devices_lock); | |
232 | ubi = ubi_devices[ubi_num]; | |
233 | if (ubi) { | |
234 | ubi_assert(ubi->ref_count >= 0); | |
235 | ubi->ref_count += 1; | |
236 | get_device(&ubi->dev); | |
237 | } | |
238 | spin_unlock(&ubi_devices_lock); | |
239 | ||
240 | return ubi; | |
241 | } | |
242 | ||
243 | /** | |
244 | * ubi_put_device - drop an UBI device reference. | |
245 | * @ubi: UBI device description object | |
246 | */ | |
247 | void ubi_put_device(struct ubi_device *ubi) | |
248 | { | |
249 | spin_lock(&ubi_devices_lock); | |
250 | ubi->ref_count -= 1; | |
251 | put_device(&ubi->dev); | |
252 | spin_unlock(&ubi_devices_lock); | |
253 | } | |
254 | ||
255 | /** | |
ebaaf1af | 256 | * ubi_get_by_major - get UBI device by character device major number. |
e73f4459 AB |
257 | * @major: major number |
258 | * | |
259 | * This function is similar to 'ubi_get_device()', but it searches the device | |
260 | * by its major number. | |
261 | */ | |
262 | struct ubi_device *ubi_get_by_major(int major) | |
263 | { | |
264 | int i; | |
265 | struct ubi_device *ubi; | |
266 | ||
267 | spin_lock(&ubi_devices_lock); | |
268 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
269 | ubi = ubi_devices[i]; | |
270 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
271 | ubi_assert(ubi->ref_count >= 0); | |
272 | ubi->ref_count += 1; | |
273 | get_device(&ubi->dev); | |
274 | spin_unlock(&ubi_devices_lock); | |
275 | return ubi; | |
276 | } | |
277 | } | |
278 | spin_unlock(&ubi_devices_lock); | |
279 | ||
280 | return NULL; | |
281 | } | |
282 | ||
283 | /** | |
284 | * ubi_major2num - get UBI device number by character device major number. | |
285 | * @major: major number | |
286 | * | |
287 | * This function searches UBI device number object by its major number. If UBI | |
cdfa788a | 288 | * device was not found, this function returns -ENODEV, otherwise the UBI device |
e73f4459 AB |
289 | * number is returned. |
290 | */ | |
291 | int ubi_major2num(int major) | |
292 | { | |
293 | int i, ubi_num = -ENODEV; | |
294 | ||
295 | spin_lock(&ubi_devices_lock); | |
296 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
297 | struct ubi_device *ubi = ubi_devices[i]; | |
298 | ||
299 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
300 | ubi_num = ubi->ubi_num; | |
301 | break; | |
302 | } | |
303 | } | |
304 | spin_unlock(&ubi_devices_lock); | |
305 | ||
306 | return ubi_num; | |
307 | } | |
308 | ||
801c135c AB |
309 | /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */ |
310 | static ssize_t dev_attribute_show(struct device *dev, | |
311 | struct device_attribute *attr, char *buf) | |
312 | { | |
e73f4459 AB |
313 | ssize_t ret; |
314 | struct ubi_device *ubi; | |
801c135c | 315 | |
e73f4459 AB |
316 | /* |
317 | * The below code looks weird, but it actually makes sense. We get the | |
318 | * UBI device reference from the contained 'struct ubi_device'. But it | |
319 | * is unclear if the device was removed or not yet. Indeed, if the | |
320 | * device was removed before we increased its reference count, | |
321 | * 'ubi_get_device()' will return -ENODEV and we fail. | |
322 | * | |
323 | * Remember, 'struct ubi_device' is freed in the release function, so | |
324 | * we still can use 'ubi->ubi_num'. | |
325 | */ | |
801c135c | 326 | ubi = container_of(dev, struct ubi_device, dev); |
e73f4459 AB |
327 | ubi = ubi_get_device(ubi->ubi_num); |
328 | if (!ubi) | |
329 | return -ENODEV; | |
330 | ||
801c135c | 331 | if (attr == &dev_eraseblock_size) |
e73f4459 | 332 | ret = sprintf(buf, "%d\n", ubi->leb_size); |
801c135c | 333 | else if (attr == &dev_avail_eraseblocks) |
e73f4459 | 334 | ret = sprintf(buf, "%d\n", ubi->avail_pebs); |
801c135c | 335 | else if (attr == &dev_total_eraseblocks) |
e73f4459 | 336 | ret = sprintf(buf, "%d\n", ubi->good_peb_count); |
801c135c | 337 | else if (attr == &dev_volumes_count) |
4b3cc340 | 338 | ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT); |
801c135c | 339 | else if (attr == &dev_max_ec) |
e73f4459 | 340 | ret = sprintf(buf, "%d\n", ubi->max_ec); |
801c135c | 341 | else if (attr == &dev_reserved_for_bad) |
e73f4459 | 342 | ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs); |
801c135c | 343 | else if (attr == &dev_bad_peb_count) |
e73f4459 | 344 | ret = sprintf(buf, "%d\n", ubi->bad_peb_count); |
801c135c | 345 | else if (attr == &dev_max_vol_count) |
e73f4459 | 346 | ret = sprintf(buf, "%d\n", ubi->vtbl_slots); |
801c135c | 347 | else if (attr == &dev_min_io_size) |
e73f4459 | 348 | ret = sprintf(buf, "%d\n", ubi->min_io_size); |
801c135c | 349 | else if (attr == &dev_bgt_enabled) |
e73f4459 | 350 | ret = sprintf(buf, "%d\n", ubi->thread_enabled); |
b6b76ba4 AB |
351 | else if (attr == &dev_mtd_num) |
352 | ret = sprintf(buf, "%d\n", ubi->mtd->index); | |
801c135c | 353 | else |
b6b76ba4 | 354 | ret = -EINVAL; |
801c135c | 355 | |
e73f4459 AB |
356 | ubi_put_device(ubi); |
357 | return ret; | |
801c135c AB |
358 | } |
359 | ||
36b477d0 AB |
360 | static void dev_release(struct device *dev) |
361 | { | |
362 | struct ubi_device *ubi = container_of(dev, struct ubi_device, dev); | |
363 | ||
364 | kfree(ubi); | |
365 | } | |
801c135c AB |
366 | |
367 | /** | |
368 | * ubi_sysfs_init - initialize sysfs for an UBI device. | |
369 | * @ubi: UBI device description object | |
0bf1c439 AB |
370 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
371 | * taken | |
801c135c AB |
372 | * |
373 | * This function returns zero in case of success and a negative error code in | |
374 | * case of failure. | |
375 | */ | |
0bf1c439 | 376 | static int ubi_sysfs_init(struct ubi_device *ubi, int *ref) |
801c135c AB |
377 | { |
378 | int err; | |
379 | ||
380 | ubi->dev.release = dev_release; | |
49dfc299 | 381 | ubi->dev.devt = ubi->cdev.dev; |
801c135c | 382 | ubi->dev.class = ubi_class; |
160bbab3 | 383 | dev_set_name(&ubi->dev, UBI_NAME_STR"%d", ubi->ubi_num); |
801c135c AB |
384 | err = device_register(&ubi->dev); |
385 | if (err) | |
db6e5770 | 386 | return err; |
801c135c | 387 | |
0bf1c439 | 388 | *ref = 1; |
801c135c AB |
389 | err = device_create_file(&ubi->dev, &dev_eraseblock_size); |
390 | if (err) | |
db6e5770 | 391 | return err; |
801c135c AB |
392 | err = device_create_file(&ubi->dev, &dev_avail_eraseblocks); |
393 | if (err) | |
db6e5770 | 394 | return err; |
801c135c AB |
395 | err = device_create_file(&ubi->dev, &dev_total_eraseblocks); |
396 | if (err) | |
db6e5770 | 397 | return err; |
801c135c AB |
398 | err = device_create_file(&ubi->dev, &dev_volumes_count); |
399 | if (err) | |
db6e5770 | 400 | return err; |
801c135c AB |
401 | err = device_create_file(&ubi->dev, &dev_max_ec); |
402 | if (err) | |
db6e5770 | 403 | return err; |
801c135c AB |
404 | err = device_create_file(&ubi->dev, &dev_reserved_for_bad); |
405 | if (err) | |
db6e5770 | 406 | return err; |
801c135c AB |
407 | err = device_create_file(&ubi->dev, &dev_bad_peb_count); |
408 | if (err) | |
db6e5770 | 409 | return err; |
801c135c AB |
410 | err = device_create_file(&ubi->dev, &dev_max_vol_count); |
411 | if (err) | |
db6e5770 | 412 | return err; |
801c135c AB |
413 | err = device_create_file(&ubi->dev, &dev_min_io_size); |
414 | if (err) | |
db6e5770 | 415 | return err; |
801c135c | 416 | err = device_create_file(&ubi->dev, &dev_bgt_enabled); |
b6b76ba4 AB |
417 | if (err) |
418 | return err; | |
419 | err = device_create_file(&ubi->dev, &dev_mtd_num); | |
801c135c AB |
420 | return err; |
421 | } | |
422 | ||
423 | /** | |
424 | * ubi_sysfs_close - close sysfs for an UBI device. | |
425 | * @ubi: UBI device description object | |
426 | */ | |
427 | static void ubi_sysfs_close(struct ubi_device *ubi) | |
428 | { | |
b6b76ba4 | 429 | device_remove_file(&ubi->dev, &dev_mtd_num); |
801c135c AB |
430 | device_remove_file(&ubi->dev, &dev_bgt_enabled); |
431 | device_remove_file(&ubi->dev, &dev_min_io_size); | |
432 | device_remove_file(&ubi->dev, &dev_max_vol_count); | |
433 | device_remove_file(&ubi->dev, &dev_bad_peb_count); | |
434 | device_remove_file(&ubi->dev, &dev_reserved_for_bad); | |
435 | device_remove_file(&ubi->dev, &dev_max_ec); | |
436 | device_remove_file(&ubi->dev, &dev_volumes_count); | |
437 | device_remove_file(&ubi->dev, &dev_total_eraseblocks); | |
438 | device_remove_file(&ubi->dev, &dev_avail_eraseblocks); | |
439 | device_remove_file(&ubi->dev, &dev_eraseblock_size); | |
440 | device_unregister(&ubi->dev); | |
441 | } | |
442 | ||
443 | /** | |
0bf1c439 | 444 | * kill_volumes - destroy all user volumes. |
801c135c AB |
445 | * @ubi: UBI device description object |
446 | */ | |
447 | static void kill_volumes(struct ubi_device *ubi) | |
448 | { | |
449 | int i; | |
450 | ||
451 | for (i = 0; i < ubi->vtbl_slots; i++) | |
452 | if (ubi->volumes[i]) | |
89b96b69 | 453 | ubi_free_volume(ubi, ubi->volumes[i]); |
801c135c AB |
454 | } |
455 | ||
456 | /** | |
457 | * uif_init - initialize user interfaces for an UBI device. | |
458 | * @ubi: UBI device description object | |
0bf1c439 AB |
459 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
460 | * taken, otherwise set to %0 | |
461 | * | |
462 | * This function initializes various user interfaces for an UBI device. If the | |
463 | * initialization fails at an early stage, this function frees all the | |
464 | * resources it allocated, returns an error, and @ref is set to %0. However, | |
465 | * if the initialization fails after the UBI device was registered in the | |
466 | * driver core subsystem, this function takes a reference to @ubi->dev, because | |
467 | * otherwise the release function ('dev_release()') would free whole @ubi | |
468 | * object. The @ref argument is set to %1 in this case. The caller has to put | |
469 | * this reference. | |
801c135c AB |
470 | * |
471 | * This function returns zero in case of success and a negative error code in | |
0bf1c439 | 472 | * case of failure. |
801c135c | 473 | */ |
0bf1c439 | 474 | static int uif_init(struct ubi_device *ubi, int *ref) |
801c135c | 475 | { |
8c4c19f1 | 476 | int i, err; |
801c135c AB |
477 | dev_t dev; |
478 | ||
0bf1c439 | 479 | *ref = 0; |
801c135c AB |
480 | sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num); |
481 | ||
482 | /* | |
483 | * Major numbers for the UBI character devices are allocated | |
484 | * dynamically. Major numbers of volume character devices are | |
485 | * equivalent to ones of the corresponding UBI character device. Minor | |
486 | * numbers of UBI character devices are 0, while minor numbers of | |
487 | * volume character devices start from 1. Thus, we allocate one major | |
488 | * number and ubi->vtbl_slots + 1 minor numbers. | |
489 | */ | |
490 | err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name); | |
491 | if (err) { | |
492 | ubi_err("cannot register UBI character devices"); | |
493 | return err; | |
494 | } | |
495 | ||
49dfc299 | 496 | ubi_assert(MINOR(dev) == 0); |
801c135c | 497 | cdev_init(&ubi->cdev, &ubi_cdev_operations); |
c8566350 | 498 | dbg_gen("%s major is %u", ubi->ubi_name, MAJOR(dev)); |
801c135c AB |
499 | ubi->cdev.owner = THIS_MODULE; |
500 | ||
801c135c AB |
501 | err = cdev_add(&ubi->cdev, dev, 1); |
502 | if (err) { | |
01f7b309 | 503 | ubi_err("cannot add character device"); |
801c135c AB |
504 | goto out_unreg; |
505 | } | |
506 | ||
0bf1c439 | 507 | err = ubi_sysfs_init(ubi, ref); |
801c135c | 508 | if (err) |
db6e5770 | 509 | goto out_sysfs; |
801c135c AB |
510 | |
511 | for (i = 0; i < ubi->vtbl_slots; i++) | |
512 | if (ubi->volumes[i]) { | |
89b96b69 | 513 | err = ubi_add_volume(ubi, ubi->volumes[i]); |
01f7b309 AB |
514 | if (err) { |
515 | ubi_err("cannot add volume %d", i); | |
801c135c | 516 | goto out_volumes; |
01f7b309 | 517 | } |
801c135c AB |
518 | } |
519 | ||
520 | return 0; | |
521 | ||
522 | out_volumes: | |
523 | kill_volumes(ubi); | |
db6e5770 | 524 | out_sysfs: |
0bf1c439 AB |
525 | if (*ref) |
526 | get_device(&ubi->dev); | |
801c135c | 527 | ubi_sysfs_close(ubi); |
801c135c AB |
528 | cdev_del(&ubi->cdev); |
529 | out_unreg: | |
49dfc299 | 530 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
01f7b309 | 531 | ubi_err("cannot initialize UBI %s, error %d", ubi->ubi_name, err); |
801c135c AB |
532 | return err; |
533 | } | |
534 | ||
535 | /** | |
536 | * uif_close - close user interfaces for an UBI device. | |
537 | * @ubi: UBI device description object | |
505d1caa AB |
538 | * |
539 | * Note, since this function un-registers UBI volume device objects (@vol->dev), | |
540 | * the memory allocated voe the volumes is freed as well (in the release | |
541 | * function). | |
801c135c AB |
542 | */ |
543 | static void uif_close(struct ubi_device *ubi) | |
544 | { | |
545 | kill_volumes(ubi); | |
546 | ubi_sysfs_close(ubi); | |
547 | cdev_del(&ubi->cdev); | |
49dfc299 | 548 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
801c135c AB |
549 | } |
550 | ||
505d1caa AB |
551 | /** |
552 | * free_internal_volumes - free internal volumes. | |
553 | * @ubi: UBI device description object | |
554 | */ | |
555 | static void free_internal_volumes(struct ubi_device *ubi) | |
556 | { | |
557 | int i; | |
558 | ||
559 | for (i = ubi->vtbl_slots; | |
560 | i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { | |
561 | kfree(ubi->volumes[i]->eba_tbl); | |
562 | kfree(ubi->volumes[i]); | |
563 | } | |
564 | } | |
565 | ||
801c135c AB |
566 | /** |
567 | * attach_by_scanning - attach an MTD device using scanning method. | |
568 | * @ubi: UBI device descriptor | |
569 | * | |
570 | * This function returns zero in case of success and a negative error code in | |
571 | * case of failure. | |
572 | * | |
573 | * Note, currently this is the only method to attach UBI devices. Hopefully in | |
574 | * the future we'll have more scalable attaching methods and avoid full media | |
575 | * scanning. But even in this case scanning will be needed as a fall-back | |
576 | * attaching method if there are some on-flash table corruptions. | |
577 | */ | |
578 | static int attach_by_scanning(struct ubi_device *ubi) | |
579 | { | |
580 | int err; | |
581 | struct ubi_scan_info *si; | |
582 | ||
583 | si = ubi_scan(ubi); | |
584 | if (IS_ERR(si)) | |
585 | return PTR_ERR(si); | |
586 | ||
587 | ubi->bad_peb_count = si->bad_peb_count; | |
588 | ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count; | |
589 | ubi->max_ec = si->max_ec; | |
590 | ubi->mean_ec = si->mean_ec; | |
591 | ||
592 | err = ubi_read_volume_table(ubi, si); | |
593 | if (err) | |
594 | goto out_si; | |
595 | ||
596 | err = ubi_wl_init_scan(ubi, si); | |
597 | if (err) | |
598 | goto out_vtbl; | |
599 | ||
600 | err = ubi_eba_init_scan(ubi, si); | |
601 | if (err) | |
602 | goto out_wl; | |
603 | ||
604 | ubi_scan_destroy_si(si); | |
605 | return 0; | |
606 | ||
607 | out_wl: | |
608 | ubi_wl_close(ubi); | |
609 | out_vtbl: | |
505d1caa | 610 | free_internal_volumes(ubi); |
d7f0c4dc | 611 | vfree(ubi->vtbl); |
801c135c AB |
612 | out_si: |
613 | ubi_scan_destroy_si(si); | |
614 | return err; | |
615 | } | |
616 | ||
617 | /** | |
85c6e6e2 | 618 | * io_init - initialize I/O sub-system for a given UBI device. |
801c135c AB |
619 | * @ubi: UBI device description object |
620 | * | |
621 | * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are | |
622 | * assumed: | |
623 | * o EC header is always at offset zero - this cannot be changed; | |
624 | * o VID header starts just after the EC header at the closest address | |
cdfa788a | 625 | * aligned to @io->hdrs_min_io_size; |
801c135c | 626 | * o data starts just after the VID header at the closest address aligned to |
cdfa788a | 627 | * @io->min_io_size |
801c135c AB |
628 | * |
629 | * This function returns zero in case of success and a negative error code in | |
630 | * case of failure. | |
631 | */ | |
632 | static int io_init(struct ubi_device *ubi) | |
633 | { | |
634 | if (ubi->mtd->numeraseregions != 0) { | |
635 | /* | |
636 | * Some flashes have several erase regions. Different regions | |
637 | * may have different eraseblock size and other | |
638 | * characteristics. It looks like mostly multi-region flashes | |
639 | * have one "main" region and one or more small regions to | |
640 | * store boot loader code or boot parameters or whatever. I | |
641 | * guess we should just pick the largest region. But this is | |
642 | * not implemented. | |
643 | */ | |
644 | ubi_err("multiple regions, not implemented"); | |
645 | return -EINVAL; | |
646 | } | |
647 | ||
dd38fccf | 648 | if (ubi->vid_hdr_offset < 0) |
cdfa788a AB |
649 | return -EINVAL; |
650 | ||
801c135c AB |
651 | /* |
652 | * Note, in this implementation we support MTD devices with 0x7FFFFFFF | |
653 | * physical eraseblocks maximum. | |
654 | */ | |
655 | ||
656 | ubi->peb_size = ubi->mtd->erasesize; | |
69423d99 | 657 | ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd); |
801c135c AB |
658 | ubi->flash_size = ubi->mtd->size; |
659 | ||
660 | if (ubi->mtd->block_isbad && ubi->mtd->block_markbad) | |
661 | ubi->bad_allowed = 1; | |
662 | ||
ebf53f42 AB |
663 | if (ubi->mtd->type == MTD_NORFLASH) { |
664 | ubi_assert(ubi->mtd->writesize == 1); | |
665 | ubi->nor_flash = 1; | |
666 | } | |
667 | ||
801c135c AB |
668 | ubi->min_io_size = ubi->mtd->writesize; |
669 | ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; | |
670 | ||
cadb40cc KP |
671 | /* |
672 | * Make sure minimal I/O unit is power of 2. Note, there is no | |
673 | * fundamental reason for this assumption. It is just an optimization | |
674 | * which allows us to avoid costly division operations. | |
675 | */ | |
7753f169 | 676 | if (!is_power_of_2(ubi->min_io_size)) { |
01f7b309 AB |
677 | ubi_err("min. I/O unit (%d) is not power of 2", |
678 | ubi->min_io_size); | |
801c135c AB |
679 | return -EINVAL; |
680 | } | |
681 | ||
682 | ubi_assert(ubi->hdrs_min_io_size > 0); | |
683 | ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size); | |
684 | ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0); | |
685 | ||
686 | /* Calculate default aligned sizes of EC and VID headers */ | |
687 | ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size); | |
688 | ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size); | |
689 | ||
690 | dbg_msg("min_io_size %d", ubi->min_io_size); | |
691 | dbg_msg("hdrs_min_io_size %d", ubi->hdrs_min_io_size); | |
692 | dbg_msg("ec_hdr_alsize %d", ubi->ec_hdr_alsize); | |
693 | dbg_msg("vid_hdr_alsize %d", ubi->vid_hdr_alsize); | |
694 | ||
695 | if (ubi->vid_hdr_offset == 0) | |
696 | /* Default offset */ | |
697 | ubi->vid_hdr_offset = ubi->vid_hdr_aloffset = | |
698 | ubi->ec_hdr_alsize; | |
699 | else { | |
700 | ubi->vid_hdr_aloffset = ubi->vid_hdr_offset & | |
701 | ~(ubi->hdrs_min_io_size - 1); | |
702 | ubi->vid_hdr_shift = ubi->vid_hdr_offset - | |
703 | ubi->vid_hdr_aloffset; | |
704 | } | |
705 | ||
706 | /* Similar for the data offset */ | |
d5360587 | 707 | ubi->leb_start = ubi->vid_hdr_offset + UBI_EC_HDR_SIZE; |
dd38fccf | 708 | ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size); |
801c135c AB |
709 | |
710 | dbg_msg("vid_hdr_offset %d", ubi->vid_hdr_offset); | |
711 | dbg_msg("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset); | |
712 | dbg_msg("vid_hdr_shift %d", ubi->vid_hdr_shift); | |
713 | dbg_msg("leb_start %d", ubi->leb_start); | |
714 | ||
715 | /* The shift must be aligned to 32-bit boundary */ | |
716 | if (ubi->vid_hdr_shift % 4) { | |
717 | ubi_err("unaligned VID header shift %d", | |
718 | ubi->vid_hdr_shift); | |
719 | return -EINVAL; | |
720 | } | |
721 | ||
722 | /* Check sanity */ | |
723 | if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE || | |
724 | ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE || | |
725 | ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE || | |
cadb40cc | 726 | ubi->leb_start & (ubi->min_io_size - 1)) { |
801c135c AB |
727 | ubi_err("bad VID header (%d) or data offsets (%d)", |
728 | ubi->vid_hdr_offset, ubi->leb_start); | |
729 | return -EINVAL; | |
730 | } | |
731 | ||
b86a2c56 AB |
732 | /* |
733 | * Set maximum amount of physical erroneous eraseblocks to be 10%. | |
734 | * Erroneous PEB are those which have read errors. | |
735 | */ | |
736 | ubi->max_erroneous = ubi->peb_count / 10; | |
737 | if (ubi->max_erroneous < 16) | |
738 | ubi->max_erroneous = 16; | |
739 | dbg_msg("max_erroneous %d", ubi->max_erroneous); | |
740 | ||
801c135c AB |
741 | /* |
742 | * It may happen that EC and VID headers are situated in one minimal | |
743 | * I/O unit. In this case we can only accept this UBI image in | |
744 | * read-only mode. | |
745 | */ | |
746 | if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) { | |
747 | ubi_warn("EC and VID headers are in the same minimal I/O unit, " | |
748 | "switch to read-only mode"); | |
749 | ubi->ro_mode = 1; | |
750 | } | |
751 | ||
752 | ubi->leb_size = ubi->peb_size - ubi->leb_start; | |
753 | ||
754 | if (!(ubi->mtd->flags & MTD_WRITEABLE)) { | |
755 | ubi_msg("MTD device %d is write-protected, attach in " | |
756 | "read-only mode", ubi->mtd->index); | |
757 | ubi->ro_mode = 1; | |
758 | } | |
759 | ||
434b825e AB |
760 | ubi_msg("physical eraseblock size: %d bytes (%d KiB)", |
761 | ubi->peb_size, ubi->peb_size >> 10); | |
762 | ubi_msg("logical eraseblock size: %d bytes", ubi->leb_size); | |
763 | ubi_msg("smallest flash I/O unit: %d", ubi->min_io_size); | |
764 | if (ubi->hdrs_min_io_size != ubi->min_io_size) | |
765 | ubi_msg("sub-page size: %d", | |
766 | ubi->hdrs_min_io_size); | |
767 | ubi_msg("VID header offset: %d (aligned %d)", | |
768 | ubi->vid_hdr_offset, ubi->vid_hdr_aloffset); | |
769 | ubi_msg("data offset: %d", ubi->leb_start); | |
801c135c AB |
770 | |
771 | /* | |
772 | * Note, ideally, we have to initialize ubi->bad_peb_count here. But | |
773 | * unfortunately, MTD does not provide this information. We should loop | |
774 | * over all physical eraseblocks and invoke mtd->block_is_bad() for | |
775 | * each physical eraseblock. So, we skip ubi->bad_peb_count | |
776 | * uninitialized and initialize it after scanning. | |
777 | */ | |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
4ccf8cff AB |
782 | /** |
783 | * autoresize - re-size the volume which has the "auto-resize" flag set. | |
784 | * @ubi: UBI device description object | |
785 | * @vol_id: ID of the volume to re-size | |
786 | * | |
787 | * This function re-sizes the volume marked by the @UBI_VTBL_AUTORESIZE_FLG in | |
788 | * the volume table to the largest possible size. See comments in ubi-header.h | |
789 | * for more description of the flag. Returns zero in case of success and a | |
790 | * negative error code in case of failure. | |
791 | */ | |
792 | static int autoresize(struct ubi_device *ubi, int vol_id) | |
793 | { | |
794 | struct ubi_volume_desc desc; | |
795 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
796 | int err, old_reserved_pebs = vol->reserved_pebs; | |
797 | ||
798 | /* | |
799 | * Clear the auto-resize flag in the volume in-memory copy of the | |
505d1caa | 800 | * volume table, and 'ubi_resize_volume()' will propagate this change |
4ccf8cff AB |
801 | * to the flash. |
802 | */ | |
803 | ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG; | |
804 | ||
805 | if (ubi->avail_pebs == 0) { | |
806 | struct ubi_vtbl_record vtbl_rec; | |
807 | ||
808 | /* | |
505d1caa | 809 | * No available PEBs to re-size the volume, clear the flag on |
4ccf8cff AB |
810 | * flash and exit. |
811 | */ | |
812 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], | |
813 | sizeof(struct ubi_vtbl_record)); | |
814 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
815 | if (err) | |
816 | ubi_err("cannot clean auto-resize flag for volume %d", | |
817 | vol_id); | |
818 | } else { | |
819 | desc.vol = vol; | |
820 | err = ubi_resize_volume(&desc, | |
821 | old_reserved_pebs + ubi->avail_pebs); | |
822 | if (err) | |
823 | ubi_err("cannot auto-resize volume %d", vol_id); | |
824 | } | |
825 | ||
826 | if (err) | |
827 | return err; | |
828 | ||
829 | ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id, | |
830 | vol->name, old_reserved_pebs, vol->reserved_pebs); | |
831 | return 0; | |
832 | } | |
833 | ||
d9dd0887 KC |
834 | /** |
835 | * ubi_reboot_notifier - halt UBI transactions immediately prior to a reboot. | |
836 | * @n: reboot notifier object | |
837 | * @state: SYS_RESTART, SYS_HALT, or SYS_POWER_OFF | |
838 | * @cmd: pointer to command string for RESTART2 | |
839 | * | |
840 | * This function stops the UBI background thread so that the flash device | |
841 | * remains quiescent when Linux restarts the system. Any queued work will be | |
842 | * discarded, but this function will block until do_work() finishes if an | |
843 | * operation is already in progress. | |
844 | * | |
845 | * This function solves a real-life problem observed on NOR flashes when an | |
846 | * PEB erase operation starts, then the system is rebooted before the erase is | |
847 | * finishes, and the boot loader gets confused and dies. So we prefer to finish | |
848 | * the ongoing operation before rebooting. | |
849 | */ | |
850 | static int ubi_reboot_notifier(struct notifier_block *n, unsigned long state, | |
851 | void *cmd) | |
852 | { | |
853 | struct ubi_device *ubi; | |
854 | ||
855 | ubi = container_of(n, struct ubi_device, reboot_notifier); | |
856 | if (ubi->bgt_thread) | |
857 | kthread_stop(ubi->bgt_thread); | |
858 | ubi_sync(ubi->ubi_num); | |
859 | return NOTIFY_DONE; | |
860 | } | |
861 | ||
801c135c | 862 | /** |
cdfa788a | 863 | * ubi_attach_mtd_dev - attach an MTD device. |
ebaaf1af | 864 | * @mtd: MTD device description object |
897a316c | 865 | * @ubi_num: number to assign to the new UBI device |
801c135c | 866 | * @vid_hdr_offset: VID header offset |
801c135c | 867 | * |
897a316c AB |
868 | * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number |
869 | * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in | |
505d1caa | 870 | * which case this function finds a vacant device number and assigns it |
897a316c AB |
871 | * automatically. Returns the new UBI device number in case of success and a |
872 | * negative error code in case of failure. | |
cdfa788a AB |
873 | * |
874 | * Note, the invocations of this function has to be serialized by the | |
875 | * @ubi_devices_mutex. | |
801c135c | 876 | */ |
897a316c | 877 | int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset) |
801c135c AB |
878 | { |
879 | struct ubi_device *ubi; | |
0bf1c439 | 880 | int i, err, ref = 0; |
801c135c | 881 | |
cdfa788a AB |
882 | /* |
883 | * Check if we already have the same MTD device attached. | |
884 | * | |
885 | * Note, this function assumes that UBI devices creations and deletions | |
886 | * are serialized, so it does not take the &ubi_devices_lock. | |
887 | */ | |
897a316c | 888 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
b96bf4c3 | 889 | ubi = ubi_devices[i]; |
cdfa788a | 890 | if (ubi && mtd->index == ubi->mtd->index) { |
897a316c | 891 | dbg_err("mtd%d is already attached to ubi%d", |
801c135c | 892 | mtd->index, i); |
897a316c | 893 | return -EEXIST; |
801c135c | 894 | } |
897a316c | 895 | } |
801c135c | 896 | |
897a316c AB |
897 | /* |
898 | * Make sure this MTD device is not emulated on top of an UBI volume | |
899 | * already. Well, generally this recursion works fine, but there are | |
900 | * different problems like the UBI module takes a reference to itself | |
901 | * by attaching (and thus, opening) the emulated MTD device. This | |
902 | * results in inability to unload the module. And in general it makes | |
903 | * no sense to attach emulated MTD devices, so we prohibit this. | |
904 | */ | |
905 | if (mtd->type == MTD_UBIVOLUME) { | |
906 | ubi_err("refuse attaching mtd%d - it is already emulated on " | |
907 | "top of UBI", mtd->index); | |
908 | return -EINVAL; | |
909 | } | |
910 | ||
911 | if (ubi_num == UBI_DEV_NUM_AUTO) { | |
912 | /* Search for an empty slot in the @ubi_devices array */ | |
913 | for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) | |
914 | if (!ubi_devices[ubi_num]) | |
915 | break; | |
916 | if (ubi_num == UBI_MAX_DEVICES) { | |
9c9ec147 AB |
917 | dbg_err("only %d UBI devices may be created", |
918 | UBI_MAX_DEVICES); | |
897a316c AB |
919 | return -ENFILE; |
920 | } | |
921 | } else { | |
922 | if (ubi_num >= UBI_MAX_DEVICES) | |
923 | return -EINVAL; | |
b96bf4c3 | 924 | |
897a316c AB |
925 | /* Make sure ubi_num is not busy */ |
926 | if (ubi_devices[ubi_num]) { | |
927 | dbg_err("ubi%d already exists", ubi_num); | |
928 | return -EEXIST; | |
929 | } | |
b96bf4c3 AB |
930 | } |
931 | ||
cdfa788a AB |
932 | ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL); |
933 | if (!ubi) | |
934 | return -ENOMEM; | |
801c135c | 935 | |
cdfa788a | 936 | ubi->mtd = mtd; |
897a316c | 937 | ubi->ubi_num = ubi_num; |
801c135c | 938 | ubi->vid_hdr_offset = vid_hdr_offset; |
4ccf8cff AB |
939 | ubi->autoresize_vol_id = -1; |
940 | ||
941 | mutex_init(&ubi->buf_mutex); | |
942 | mutex_init(&ubi->ckvol_mutex); | |
f089c0b2 | 943 | mutex_init(&ubi->device_mutex); |
4ccf8cff | 944 | spin_lock_init(&ubi->volumes_lock); |
cdfa788a | 945 | |
697fa972 | 946 | ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num); |
cdfa788a | 947 | |
801c135c AB |
948 | err = io_init(ubi); |
949 | if (err) | |
950 | goto out_free; | |
951 | ||
ad5942ba | 952 | err = -ENOMEM; |
e88d6e10 AB |
953 | ubi->peb_buf1 = vmalloc(ubi->peb_size); |
954 | if (!ubi->peb_buf1) | |
955 | goto out_free; | |
956 | ||
957 | ubi->peb_buf2 = vmalloc(ubi->peb_size); | |
958 | if (!ubi->peb_buf2) | |
ad5942ba | 959 | goto out_free; |
e88d6e10 | 960 | |
2cb81e21 | 961 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID |
e88d6e10 AB |
962 | mutex_init(&ubi->dbg_buf_mutex); |
963 | ubi->dbg_peb_buf = vmalloc(ubi->peb_size); | |
964 | if (!ubi->dbg_peb_buf) | |
ad5942ba | 965 | goto out_free; |
e88d6e10 AB |
966 | #endif |
967 | ||
801c135c AB |
968 | err = attach_by_scanning(ubi); |
969 | if (err) { | |
970 | dbg_err("failed to attach by scanning, error %d", err); | |
971 | goto out_free; | |
972 | } | |
973 | ||
4ccf8cff AB |
974 | if (ubi->autoresize_vol_id != -1) { |
975 | err = autoresize(ubi, ubi->autoresize_vol_id); | |
976 | if (err) | |
977 | goto out_detach; | |
978 | } | |
979 | ||
0bf1c439 | 980 | err = uif_init(ubi, &ref); |
801c135c | 981 | if (err) |
0bf1c439 | 982 | goto out_detach; |
801c135c | 983 | |
cdfa788a AB |
984 | ubi->bgt_thread = kthread_create(ubi_thread, ubi, ubi->bgt_name); |
985 | if (IS_ERR(ubi->bgt_thread)) { | |
986 | err = PTR_ERR(ubi->bgt_thread); | |
987 | ubi_err("cannot spawn \"%s\", error %d", ubi->bgt_name, | |
988 | err); | |
989 | goto out_uif; | |
990 | } | |
991 | ||
897a316c | 992 | ubi_msg("attached mtd%d to ubi%d", mtd->index, ubi_num); |
cdfa788a | 993 | ubi_msg("MTD device name: \"%s\"", mtd->name); |
801c135c | 994 | ubi_msg("MTD device size: %llu MiB", ubi->flash_size >> 20); |
801c135c AB |
995 | ubi_msg("number of good PEBs: %d", ubi->good_peb_count); |
996 | ubi_msg("number of bad PEBs: %d", ubi->bad_peb_count); | |
801c135c AB |
997 | ubi_msg("max. allowed volumes: %d", ubi->vtbl_slots); |
998 | ubi_msg("wear-leveling threshold: %d", CONFIG_MTD_UBI_WL_THRESHOLD); | |
999 | ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT); | |
1000 | ubi_msg("number of user volumes: %d", | |
1001 | ubi->vol_count - UBI_INT_VOL_COUNT); | |
1002 | ubi_msg("available PEBs: %d", ubi->avail_pebs); | |
1003 | ubi_msg("total number of reserved PEBs: %d", ubi->rsvd_pebs); | |
1004 | ubi_msg("number of PEBs reserved for bad PEB handling: %d", | |
1005 | ubi->beb_rsvd_pebs); | |
1006 | ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec); | |
0c6c7fa1 | 1007 | ubi_msg("image sequence number: %d", ubi->image_seq); |
801c135c | 1008 | |
ddbd3b61 AB |
1009 | /* |
1010 | * The below lock makes sure we do not race with 'ubi_thread()' which | |
1011 | * checks @ubi->thread_enabled. Otherwise we may fail to wake it up. | |
1012 | */ | |
1013 | spin_lock(&ubi->wl_lock); | |
d37e6bf6 | 1014 | if (!DBG_DISABLE_BGT) |
801c135c | 1015 | ubi->thread_enabled = 1; |
d37e6bf6 | 1016 | wake_up_process(ubi->bgt_thread); |
ddbd3b61 | 1017 | spin_unlock(&ubi->wl_lock); |
801c135c | 1018 | |
d9dd0887 KC |
1019 | /* Flash device priority is 0 - UBI needs to shut down first */ |
1020 | ubi->reboot_notifier.priority = 1; | |
1021 | ubi->reboot_notifier.notifier_call = ubi_reboot_notifier; | |
1022 | register_reboot_notifier(&ubi->reboot_notifier); | |
1023 | ||
897a316c | 1024 | ubi_devices[ubi_num] = ubi; |
0e0ee1cc | 1025 | ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL); |
897a316c | 1026 | return ubi_num; |
801c135c | 1027 | |
cdfa788a AB |
1028 | out_uif: |
1029 | uif_close(ubi); | |
801c135c | 1030 | out_detach: |
801c135c | 1031 | ubi_wl_close(ubi); |
505d1caa | 1032 | free_internal_volumes(ubi); |
d7f0c4dc | 1033 | vfree(ubi->vtbl); |
801c135c | 1034 | out_free: |
e88d6e10 AB |
1035 | vfree(ubi->peb_buf1); |
1036 | vfree(ubi->peb_buf2); | |
2cb81e21 | 1037 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID |
e88d6e10 AB |
1038 | vfree(ubi->dbg_peb_buf); |
1039 | #endif | |
0bf1c439 AB |
1040 | if (ref) |
1041 | put_device(&ubi->dev); | |
1042 | else | |
1043 | kfree(ubi); | |
801c135c AB |
1044 | return err; |
1045 | } | |
1046 | ||
1047 | /** | |
cdfa788a AB |
1048 | * ubi_detach_mtd_dev - detach an MTD device. |
1049 | * @ubi_num: UBI device number to detach from | |
1050 | * @anyway: detach MTD even if device reference count is not zero | |
1051 | * | |
1052 | * This function destroys an UBI device number @ubi_num and detaches the | |
1053 | * underlying MTD device. Returns zero in case of success and %-EBUSY if the | |
1054 | * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not | |
1055 | * exist. | |
1056 | * | |
1057 | * Note, the invocations of this function has to be serialized by the | |
1058 | * @ubi_devices_mutex. | |
801c135c | 1059 | */ |
cdfa788a | 1060 | int ubi_detach_mtd_dev(int ubi_num, int anyway) |
801c135c | 1061 | { |
cdfa788a AB |
1062 | struct ubi_device *ubi; |
1063 | ||
1064 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
1065 | return -EINVAL; | |
1066 | ||
0e0ee1cc DP |
1067 | ubi = ubi_get_device(ubi_num); |
1068 | if (!ubi) | |
cdfa788a | 1069 | return -EINVAL; |
cdfa788a | 1070 | |
0e0ee1cc DP |
1071 | spin_lock(&ubi_devices_lock); |
1072 | put_device(&ubi->dev); | |
1073 | ubi->ref_count -= 1; | |
cdfa788a AB |
1074 | if (ubi->ref_count) { |
1075 | if (!anyway) { | |
897a316c | 1076 | spin_unlock(&ubi_devices_lock); |
cdfa788a AB |
1077 | return -EBUSY; |
1078 | } | |
1079 | /* This may only happen if there is a bug */ | |
1080 | ubi_err("%s reference count %d, destroy anyway", | |
1081 | ubi->ubi_name, ubi->ref_count); | |
1082 | } | |
897a316c | 1083 | ubi_devices[ubi_num] = NULL; |
cdfa788a AB |
1084 | spin_unlock(&ubi_devices_lock); |
1085 | ||
897a316c | 1086 | ubi_assert(ubi_num == ubi->ubi_num); |
0e0ee1cc | 1087 | ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL); |
897a316c | 1088 | dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num); |
cdfa788a AB |
1089 | |
1090 | /* | |
1091 | * Before freeing anything, we have to stop the background thread to | |
1092 | * prevent it from doing anything on this device while we are freeing. | |
1093 | */ | |
d9dd0887 | 1094 | unregister_reboot_notifier(&ubi->reboot_notifier); |
cdfa788a AB |
1095 | if (ubi->bgt_thread) |
1096 | kthread_stop(ubi->bgt_thread); | |
801c135c | 1097 | |
36b477d0 AB |
1098 | /* |
1099 | * Get a reference to the device in order to prevent 'dev_release()' | |
0bf1c439 | 1100 | * from freeing the @ubi object. |
36b477d0 AB |
1101 | */ |
1102 | get_device(&ubi->dev); | |
1103 | ||
801c135c | 1104 | uif_close(ubi); |
801c135c | 1105 | ubi_wl_close(ubi); |
505d1caa | 1106 | free_internal_volumes(ubi); |
92ad8f37 | 1107 | vfree(ubi->vtbl); |
801c135c | 1108 | put_mtd_device(ubi->mtd); |
e88d6e10 AB |
1109 | vfree(ubi->peb_buf1); |
1110 | vfree(ubi->peb_buf2); | |
2cb81e21 | 1111 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID |
e88d6e10 AB |
1112 | vfree(ubi->dbg_peb_buf); |
1113 | #endif | |
cdfa788a | 1114 | ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num); |
36b477d0 | 1115 | put_device(&ubi->dev); |
cdfa788a | 1116 | return 0; |
801c135c AB |
1117 | } |
1118 | ||
cdfa788a | 1119 | /** |
f9b0080e AB |
1120 | * open_mtd_by_chdev - open an MTD device by its character device node path. |
1121 | * @mtd_dev: MTD character device node path | |
1122 | * | |
1123 | * This helper function opens an MTD device by its character node device path. | |
1124 | * Returns MTD device description object in case of success and a negative | |
1125 | * error code in case of failure. | |
1126 | */ | |
1127 | static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev) | |
1128 | { | |
1129 | int err, major, minor, mode; | |
1130 | struct path path; | |
1131 | ||
1132 | /* Probably this is an MTD character device node path */ | |
1133 | err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path); | |
1134 | if (err) | |
1135 | return ERR_PTR(err); | |
1136 | ||
1137 | /* MTD device number is defined by the major / minor numbers */ | |
1138 | major = imajor(path.dentry->d_inode); | |
1139 | minor = iminor(path.dentry->d_inode); | |
1140 | mode = path.dentry->d_inode->i_mode; | |
1141 | path_put(&path); | |
1142 | if (major != MTD_CHAR_MAJOR || !S_ISCHR(mode)) | |
1143 | return ERR_PTR(-EINVAL); | |
1144 | ||
1145 | if (minor & 1) | |
1146 | /* | |
1147 | * Just do not think the "/dev/mtdrX" devices support is need, | |
1148 | * so do not support them to avoid doing extra work. | |
1149 | */ | |
1150 | return ERR_PTR(-EINVAL); | |
1151 | ||
1152 | return get_mtd_device(NULL, minor / 2); | |
1153 | } | |
1154 | ||
1155 | /** | |
1156 | * open_mtd_device - open MTD device by name, character device path, or number. | |
1157 | * @mtd_dev: name, character device node path, or MTD device device number | |
cdfa788a | 1158 | * |
d1f3dd6c | 1159 | * This function tries to open and MTD device described by @mtd_dev string, |
f9b0080e AB |
1160 | * which is first treated as ASCII MTD device number, and if it is not true, it |
1161 | * is treated as MTD device name, and if that is also not true, it is treated | |
1162 | * as MTD character device node path. Returns MTD device description object in | |
1163 | * case of success and a negative error code in case of failure. | |
cdfa788a AB |
1164 | */ |
1165 | static struct mtd_info * __init open_mtd_device(const char *mtd_dev) | |
1166 | { | |
1167 | struct mtd_info *mtd; | |
d1f3dd6c AB |
1168 | int mtd_num; |
1169 | char *endp; | |
cdfa788a | 1170 | |
d1f3dd6c AB |
1171 | mtd_num = simple_strtoul(mtd_dev, &endp, 0); |
1172 | if (*endp != '\0' || mtd_dev == endp) { | |
cdfa788a | 1173 | /* |
d1f3dd6c AB |
1174 | * This does not look like an ASCII integer, probably this is |
1175 | * MTD device name. | |
cdfa788a | 1176 | */ |
d1f3dd6c | 1177 | mtd = get_mtd_device_nm(mtd_dev); |
f9b0080e AB |
1178 | if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV) |
1179 | /* Probably this is an MTD character device node path */ | |
1180 | mtd = open_mtd_by_chdev(mtd_dev); | |
d1f3dd6c | 1181 | } else |
cdfa788a | 1182 | mtd = get_mtd_device(NULL, mtd_num); |
cdfa788a AB |
1183 | |
1184 | return mtd; | |
1185 | } | |
1186 | ||
801c135c AB |
1187 | static int __init ubi_init(void) |
1188 | { | |
1189 | int err, i, k; | |
1190 | ||
1191 | /* Ensure that EC and VID headers have correct size */ | |
1192 | BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64); | |
1193 | BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64); | |
1194 | ||
1195 | if (mtd_devs > UBI_MAX_DEVICES) { | |
c4506092 | 1196 | ubi_err("too many MTD devices, maximum is %d", UBI_MAX_DEVICES); |
801c135c AB |
1197 | return -EINVAL; |
1198 | } | |
1199 | ||
9f961b57 | 1200 | /* Create base sysfs directory and sysfs files */ |
801c135c | 1201 | ubi_class = class_create(THIS_MODULE, UBI_NAME_STR); |
9f961b57 AB |
1202 | if (IS_ERR(ubi_class)) { |
1203 | err = PTR_ERR(ubi_class); | |
c4506092 | 1204 | ubi_err("cannot create UBI class"); |
9f961b57 AB |
1205 | goto out; |
1206 | } | |
801c135c AB |
1207 | |
1208 | err = class_create_file(ubi_class, &ubi_version); | |
9f961b57 | 1209 | if (err) { |
c4506092 | 1210 | ubi_err("cannot create sysfs file"); |
801c135c | 1211 | goto out_class; |
9f961b57 AB |
1212 | } |
1213 | ||
1214 | err = misc_register(&ubi_ctrl_cdev); | |
1215 | if (err) { | |
c4506092 | 1216 | ubi_err("cannot register device"); |
9f961b57 AB |
1217 | goto out_version; |
1218 | } | |
801c135c | 1219 | |
06b68ba1 | 1220 | ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab", |
c4506092 AB |
1221 | sizeof(struct ubi_wl_entry), |
1222 | 0, 0, NULL); | |
06b68ba1 | 1223 | if (!ubi_wl_entry_slab) |
b9a06623 | 1224 | goto out_dev_unreg; |
06b68ba1 | 1225 | |
801c135c AB |
1226 | /* Attach MTD devices */ |
1227 | for (i = 0; i < mtd_devs; i++) { | |
1228 | struct mtd_dev_param *p = &mtd_dev_param[i]; | |
cdfa788a | 1229 | struct mtd_info *mtd; |
801c135c AB |
1230 | |
1231 | cond_resched(); | |
cdfa788a AB |
1232 | |
1233 | mtd = open_mtd_device(p->name); | |
1234 | if (IS_ERR(mtd)) { | |
1235 | err = PTR_ERR(mtd); | |
1236 | goto out_detach; | |
1237 | } | |
1238 | ||
1239 | mutex_lock(&ubi_devices_mutex); | |
897a316c AB |
1240 | err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, |
1241 | p->vid_hdr_offs); | |
cdfa788a AB |
1242 | mutex_unlock(&ubi_devices_mutex); |
1243 | if (err < 0) { | |
1244 | put_mtd_device(mtd); | |
c4506092 | 1245 | ubi_err("cannot attach mtd%d", mtd->index); |
801c135c | 1246 | goto out_detach; |
9f961b57 | 1247 | } |
801c135c AB |
1248 | } |
1249 | ||
1250 | return 0; | |
1251 | ||
1252 | out_detach: | |
1253 | for (k = 0; k < i; k++) | |
cdfa788a AB |
1254 | if (ubi_devices[k]) { |
1255 | mutex_lock(&ubi_devices_mutex); | |
1256 | ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1); | |
1257 | mutex_unlock(&ubi_devices_mutex); | |
1258 | } | |
06b68ba1 | 1259 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 AB |
1260 | out_dev_unreg: |
1261 | misc_deregister(&ubi_ctrl_cdev); | |
3a8d4642 | 1262 | out_version: |
801c135c AB |
1263 | class_remove_file(ubi_class, &ubi_version); |
1264 | out_class: | |
1265 | class_destroy(ubi_class); | |
9f961b57 | 1266 | out: |
c4506092 | 1267 | ubi_err("UBI error: cannot initialize UBI, error %d", err); |
801c135c AB |
1268 | return err; |
1269 | } | |
1270 | module_init(ubi_init); | |
1271 | ||
1272 | static void __exit ubi_exit(void) | |
1273 | { | |
b96bf4c3 | 1274 | int i; |
801c135c | 1275 | |
b96bf4c3 | 1276 | for (i = 0; i < UBI_MAX_DEVICES; i++) |
cdfa788a AB |
1277 | if (ubi_devices[i]) { |
1278 | mutex_lock(&ubi_devices_mutex); | |
1279 | ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1); | |
1280 | mutex_unlock(&ubi_devices_mutex); | |
1281 | } | |
06b68ba1 | 1282 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 | 1283 | misc_deregister(&ubi_ctrl_cdev); |
801c135c AB |
1284 | class_remove_file(ubi_class, &ubi_version); |
1285 | class_destroy(ubi_class); | |
1286 | } | |
1287 | module_exit(ubi_exit); | |
1288 | ||
1289 | /** | |
ebaaf1af | 1290 | * bytes_str_to_int - convert a number of bytes string into an integer. |
801c135c AB |
1291 | * @str: the string to convert |
1292 | * | |
1293 | * This function returns positive resulting integer in case of success and a | |
1294 | * negative error code in case of failure. | |
1295 | */ | |
1296 | static int __init bytes_str_to_int(const char *str) | |
1297 | { | |
1298 | char *endp; | |
1299 | unsigned long result; | |
1300 | ||
1301 | result = simple_strtoul(str, &endp, 0); | |
774b1382 | 1302 | if (str == endp || result >= INT_MAX) { |
458dbb3d AB |
1303 | printk(KERN_ERR "UBI error: incorrect bytes count: \"%s\"\n", |
1304 | str); | |
801c135c AB |
1305 | return -EINVAL; |
1306 | } | |
1307 | ||
1308 | switch (*endp) { | |
1309 | case 'G': | |
1310 | result *= 1024; | |
1311 | case 'M': | |
1312 | result *= 1024; | |
1313 | case 'K': | |
801c135c | 1314 | result *= 1024; |
aeddb877 | 1315 | if (endp[1] == 'i' && endp[2] == 'B') |
801c135c AB |
1316 | endp += 2; |
1317 | case '\0': | |
1318 | break; | |
1319 | default: | |
458dbb3d AB |
1320 | printk(KERN_ERR "UBI error: incorrect bytes count: \"%s\"\n", |
1321 | str); | |
801c135c AB |
1322 | return -EINVAL; |
1323 | } | |
1324 | ||
1325 | return result; | |
1326 | } | |
1327 | ||
1328 | /** | |
1329 | * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter. | |
1330 | * @val: the parameter value to parse | |
1331 | * @kp: not used | |
1332 | * | |
1333 | * This function returns zero in case of success and a negative error code in | |
1334 | * case of error. | |
1335 | */ | |
1336 | static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp) | |
1337 | { | |
1338 | int i, len; | |
1339 | struct mtd_dev_param *p; | |
1340 | char buf[MTD_PARAM_LEN_MAX]; | |
1341 | char *pbuf = &buf[0]; | |
ddc49391 | 1342 | char *tokens[2] = {NULL, NULL}; |
801c135c | 1343 | |
77c722dd AB |
1344 | if (!val) |
1345 | return -EINVAL; | |
1346 | ||
801c135c | 1347 | if (mtd_devs == UBI_MAX_DEVICES) { |
458dbb3d | 1348 | printk(KERN_ERR "UBI error: too many parameters, max. is %d\n", |
801c135c AB |
1349 | UBI_MAX_DEVICES); |
1350 | return -EINVAL; | |
1351 | } | |
1352 | ||
1353 | len = strnlen(val, MTD_PARAM_LEN_MAX); | |
1354 | if (len == MTD_PARAM_LEN_MAX) { | |
458dbb3d AB |
1355 | printk(KERN_ERR "UBI error: parameter \"%s\" is too long, " |
1356 | "max. is %d\n", val, MTD_PARAM_LEN_MAX); | |
801c135c AB |
1357 | return -EINVAL; |
1358 | } | |
1359 | ||
1360 | if (len == 0) { | |
458dbb3d AB |
1361 | printk(KERN_WARNING "UBI warning: empty 'mtd=' parameter - " |
1362 | "ignored\n"); | |
801c135c AB |
1363 | return 0; |
1364 | } | |
1365 | ||
1366 | strcpy(buf, val); | |
1367 | ||
1368 | /* Get rid of the final newline */ | |
1369 | if (buf[len - 1] == '\n') | |
503990eb | 1370 | buf[len - 1] = '\0'; |
801c135c | 1371 | |
ddc49391 | 1372 | for (i = 0; i < 2; i++) |
801c135c AB |
1373 | tokens[i] = strsep(&pbuf, ","); |
1374 | ||
1375 | if (pbuf) { | |
458dbb3d AB |
1376 | printk(KERN_ERR "UBI error: too many arguments at \"%s\"\n", |
1377 | val); | |
801c135c AB |
1378 | return -EINVAL; |
1379 | } | |
1380 | ||
801c135c AB |
1381 | p = &mtd_dev_param[mtd_devs]; |
1382 | strcpy(&p->name[0], tokens[0]); | |
1383 | ||
1384 | if (tokens[1]) | |
1385 | p->vid_hdr_offs = bytes_str_to_int(tokens[1]); | |
801c135c AB |
1386 | |
1387 | if (p->vid_hdr_offs < 0) | |
1388 | return p->vid_hdr_offs; | |
801c135c AB |
1389 | |
1390 | mtd_devs += 1; | |
1391 | return 0; | |
1392 | } | |
1393 | ||
1394 | module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000); | |
1395 | MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: " | |
f9b0080e | 1396 | "mtd=<name|num|path>[,<vid_hdr_offs>].\n" |
801c135c | 1397 | "Multiple \"mtd\" parameters may be specified.\n" |
f9b0080e AB |
1398 | "MTD devices may be specified by their number, name, or " |
1399 | "path to the MTD character device node.\n" | |
dd38fccf | 1400 | "Optional \"vid_hdr_offs\" parameter specifies UBI VID " |
f9b0080e AB |
1401 | "header position to be used by UBI.\n" |
1402 | "Example 1: mtd=/dev/mtd0 - attach MTD device " | |
1403 | "/dev/mtd0.\n" | |
1404 | "Example 2: mtd=content,1984 mtd=4 - attach MTD device " | |
dd38fccf AB |
1405 | "with name \"content\" using VID header offset 1984, and " |
1406 | "MTD device number 4 with default VID header offset."); | |
801c135c AB |
1407 | |
1408 | MODULE_VERSION(__stringify(UBI_VERSION)); | |
1409 | MODULE_DESCRIPTION("UBI - Unsorted Block Images"); | |
1410 | MODULE_AUTHOR("Artem Bityutskiy"); | |
1411 | MODULE_LICENSE("GPL"); |