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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". | |
801c135c AB |
30 | */ |
31 | ||
32 | #include <linux/err.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/moduleparam.h> | |
35 | #include <linux/stringify.h> | |
f9b0080e | 36 | #include <linux/namei.h> |
801c135c | 37 | #include <linux/stat.h> |
9f961b57 | 38 | #include <linux/miscdevice.h> |
ba4087e9 | 39 | #include <linux/mtd/partitions.h> |
7753f169 | 40 | #include <linux/log2.h> |
cdfa788a | 41 | #include <linux/kthread.h> |
774b1382 | 42 | #include <linux/kernel.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
801c135c AB |
44 | #include "ubi.h" |
45 | ||
46 | /* Maximum length of the 'mtd=' parameter */ | |
47 | #define MTD_PARAM_LEN_MAX 64 | |
48 | ||
5993f9b7 | 49 | /* Maximum number of comma-separated items in the 'mtd=' parameter */ |
edac493d | 50 | #define MTD_PARAM_MAX_COUNT 3 |
5993f9b7 | 51 | |
d2f588f9 RG |
52 | /* Maximum value for the number of bad PEBs per 1024 PEBs */ |
53 | #define MAX_MTD_UBI_BEB_LIMIT 768 | |
54 | ||
af7ad7a0 MKB |
55 | #ifdef CONFIG_MTD_UBI_MODULE |
56 | #define ubi_is_module() 1 | |
57 | #else | |
58 | #define ubi_is_module() 0 | |
59 | #endif | |
60 | ||
801c135c AB |
61 | /** |
62 | * struct mtd_dev_param - MTD device parameter description data structure. | |
f9b0080e AB |
63 | * @name: MTD character device node path, MTD device name, or MTD device number |
64 | * string | |
801c135c | 65 | * @vid_hdr_offs: VID header offset |
edac493d | 66 | * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs |
801c135c | 67 | */ |
9c9ec147 | 68 | struct mtd_dev_param { |
801c135c AB |
69 | char name[MTD_PARAM_LEN_MAX]; |
70 | int vid_hdr_offs; | |
edac493d | 71 | int max_beb_per1024; |
801c135c AB |
72 | }; |
73 | ||
74 | /* Numbers of elements set in the @mtd_dev_param array */ | |
9e0c7ef3 | 75 | static int __initdata mtd_devs; |
801c135c AB |
76 | |
77 | /* MTD devices specification parameters */ | |
9e0c7ef3 | 78 | static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES]; |
77e6c2f0 RW |
79 | #ifdef CONFIG_MTD_UBI_FASTMAP |
80 | /* UBI module parameter to enable fastmap automatically on non-fastmap images */ | |
81 | static bool fm_autoconvert; | |
82 | #endif | |
801c135c AB |
83 | /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */ |
84 | struct class *ubi_class; | |
85 | ||
06b68ba1 AB |
86 | /* Slab cache for wear-leveling entries */ |
87 | struct kmem_cache *ubi_wl_entry_slab; | |
88 | ||
9f961b57 AB |
89 | /* UBI control character device */ |
90 | static struct miscdevice ubi_ctrl_cdev = { | |
91 | .minor = MISC_DYNAMIC_MINOR, | |
92 | .name = "ubi_ctrl", | |
93 | .fops = &ubi_ctrl_cdev_operations, | |
94 | }; | |
06b68ba1 | 95 | |
e73f4459 AB |
96 | /* All UBI devices in system */ |
97 | static struct ubi_device *ubi_devices[UBI_MAX_DEVICES]; | |
98 | ||
cdfa788a AB |
99 | /* Serializes UBI devices creations and removals */ |
100 | DEFINE_MUTEX(ubi_devices_mutex); | |
101 | ||
e73f4459 AB |
102 | /* Protects @ubi_devices and @ubi->ref_count */ |
103 | static DEFINE_SPINLOCK(ubi_devices_lock); | |
104 | ||
801c135c | 105 | /* "Show" method for files in '/<sysfs>/class/ubi/' */ |
c174a08c AB |
106 | static ssize_t ubi_version_show(struct class *class, |
107 | struct class_attribute *attr, char *buf) | |
801c135c AB |
108 | { |
109 | return sprintf(buf, "%d\n", UBI_VERSION); | |
110 | } | |
111 | ||
112 | /* UBI version attribute ('/<sysfs>/class/ubi/version') */ | |
113 | static struct class_attribute ubi_version = | |
114 | __ATTR(version, S_IRUGO, ubi_version_show, NULL); | |
115 | ||
116 | static ssize_t dev_attribute_show(struct device *dev, | |
117 | struct device_attribute *attr, char *buf); | |
118 | ||
119 | /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */ | |
120 | static struct device_attribute dev_eraseblock_size = | |
121 | __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL); | |
122 | static struct device_attribute dev_avail_eraseblocks = | |
123 | __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
124 | static struct device_attribute dev_total_eraseblocks = | |
125 | __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
126 | static struct device_attribute dev_volumes_count = | |
127 | __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL); | |
128 | static struct device_attribute dev_max_ec = | |
129 | __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL); | |
130 | static struct device_attribute dev_reserved_for_bad = | |
131 | __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL); | |
132 | static struct device_attribute dev_bad_peb_count = | |
133 | __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL); | |
134 | static struct device_attribute dev_max_vol_count = | |
135 | __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL); | |
136 | static struct device_attribute dev_min_io_size = | |
137 | __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL); | |
138 | static struct device_attribute dev_bgt_enabled = | |
139 | __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL); | |
b6b76ba4 AB |
140 | static struct device_attribute dev_mtd_num = |
141 | __ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL); | |
801c135c | 142 | |
0e0ee1cc DP |
143 | /** |
144 | * ubi_volume_notify - send a volume change notification. | |
145 | * @ubi: UBI device description object | |
146 | * @vol: volume description object of the changed volume | |
147 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
148 | * | |
149 | * This is a helper function which notifies all subscribers about a volume | |
150 | * change event (creation, removal, re-sizing, re-naming, updating). Returns | |
151 | * zero in case of success and a negative error code in case of failure. | |
152 | */ | |
153 | int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype) | |
154 | { | |
155 | struct ubi_notification nt; | |
156 | ||
157 | ubi_do_get_device_info(ubi, &nt.di); | |
158 | ubi_do_get_volume_info(ubi, vol, &nt.vi); | |
77e6c2f0 RW |
159 | |
160 | #ifdef CONFIG_MTD_UBI_FASTMAP | |
161 | switch (ntype) { | |
162 | case UBI_VOLUME_ADDED: | |
163 | case UBI_VOLUME_REMOVED: | |
164 | case UBI_VOLUME_RESIZED: | |
165 | case UBI_VOLUME_RENAMED: | |
166 | if (ubi_update_fastmap(ubi)) { | |
167 | ubi_err("Unable to update fastmap!"); | |
168 | ubi_ro_mode(ubi); | |
169 | } | |
170 | } | |
171 | #endif | |
0e0ee1cc DP |
172 | return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt); |
173 | } | |
174 | ||
175 | /** | |
176 | * ubi_notify_all - send a notification to all volumes. | |
177 | * @ubi: UBI device description object | |
178 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
179 | * @nb: the notifier to call | |
180 | * | |
181 | * This function walks all volumes of UBI device @ubi and sends the @ntype | |
182 | * notification for each volume. If @nb is %NULL, then all registered notifiers | |
183 | * are called, otherwise only the @nb notifier is called. Returns the number of | |
184 | * sent notifications. | |
185 | */ | |
186 | int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb) | |
187 | { | |
188 | struct ubi_notification nt; | |
189 | int i, count = 0; | |
190 | ||
191 | ubi_do_get_device_info(ubi, &nt.di); | |
192 | ||
193 | mutex_lock(&ubi->device_mutex); | |
194 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
195 | /* | |
196 | * Since the @ubi->device is locked, and we are not going to | |
197 | * change @ubi->volumes, we do not have to lock | |
198 | * @ubi->volumes_lock. | |
199 | */ | |
200 | if (!ubi->volumes[i]) | |
201 | continue; | |
202 | ||
203 | ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi); | |
204 | if (nb) | |
205 | nb->notifier_call(nb, ntype, &nt); | |
206 | else | |
207 | blocking_notifier_call_chain(&ubi_notifiers, ntype, | |
208 | &nt); | |
209 | count += 1; | |
210 | } | |
211 | mutex_unlock(&ubi->device_mutex); | |
212 | ||
213 | return count; | |
214 | } | |
215 | ||
216 | /** | |
217 | * ubi_enumerate_volumes - send "add" notification for all existing volumes. | |
218 | * @nb: the notifier to call | |
219 | * | |
220 | * This function walks all UBI devices and volumes and sends the | |
221 | * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all | |
222 | * registered notifiers are called, otherwise only the @nb notifier is called. | |
223 | * Returns the number of sent notifications. | |
224 | */ | |
225 | int ubi_enumerate_volumes(struct notifier_block *nb) | |
226 | { | |
227 | int i, count = 0; | |
228 | ||
229 | /* | |
230 | * Since the @ubi_devices_mutex is locked, and we are not going to | |
231 | * change @ubi_devices, we do not have to lock @ubi_devices_lock. | |
232 | */ | |
233 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
234 | struct ubi_device *ubi = ubi_devices[i]; | |
235 | ||
236 | if (!ubi) | |
237 | continue; | |
238 | count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb); | |
239 | } | |
240 | ||
241 | return count; | |
242 | } | |
243 | ||
e73f4459 AB |
244 | /** |
245 | * ubi_get_device - get UBI device. | |
246 | * @ubi_num: UBI device number | |
247 | * | |
248 | * This function returns UBI device description object for UBI device number | |
249 | * @ubi_num, or %NULL if the device does not exist. This function increases the | |
250 | * device reference count to prevent removal of the device. In other words, the | |
251 | * device cannot be removed if its reference count is not zero. | |
252 | */ | |
253 | struct ubi_device *ubi_get_device(int ubi_num) | |
254 | { | |
255 | struct ubi_device *ubi; | |
256 | ||
257 | spin_lock(&ubi_devices_lock); | |
258 | ubi = ubi_devices[ubi_num]; | |
259 | if (ubi) { | |
260 | ubi_assert(ubi->ref_count >= 0); | |
261 | ubi->ref_count += 1; | |
262 | get_device(&ubi->dev); | |
263 | } | |
264 | spin_unlock(&ubi_devices_lock); | |
265 | ||
266 | return ubi; | |
267 | } | |
268 | ||
269 | /** | |
270 | * ubi_put_device - drop an UBI device reference. | |
271 | * @ubi: UBI device description object | |
272 | */ | |
273 | void ubi_put_device(struct ubi_device *ubi) | |
274 | { | |
275 | spin_lock(&ubi_devices_lock); | |
276 | ubi->ref_count -= 1; | |
277 | put_device(&ubi->dev); | |
278 | spin_unlock(&ubi_devices_lock); | |
279 | } | |
280 | ||
281 | /** | |
ebaaf1af | 282 | * ubi_get_by_major - get UBI device by character device major number. |
e73f4459 AB |
283 | * @major: major number |
284 | * | |
285 | * This function is similar to 'ubi_get_device()', but it searches the device | |
286 | * by its major number. | |
287 | */ | |
288 | struct ubi_device *ubi_get_by_major(int major) | |
289 | { | |
290 | int i; | |
291 | struct ubi_device *ubi; | |
292 | ||
293 | spin_lock(&ubi_devices_lock); | |
294 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
295 | ubi = ubi_devices[i]; | |
296 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
297 | ubi_assert(ubi->ref_count >= 0); | |
298 | ubi->ref_count += 1; | |
299 | get_device(&ubi->dev); | |
300 | spin_unlock(&ubi_devices_lock); | |
301 | return ubi; | |
302 | } | |
303 | } | |
304 | spin_unlock(&ubi_devices_lock); | |
305 | ||
306 | return NULL; | |
307 | } | |
308 | ||
309 | /** | |
310 | * ubi_major2num - get UBI device number by character device major number. | |
311 | * @major: major number | |
312 | * | |
313 | * This function searches UBI device number object by its major number. If UBI | |
cdfa788a | 314 | * device was not found, this function returns -ENODEV, otherwise the UBI device |
e73f4459 AB |
315 | * number is returned. |
316 | */ | |
317 | int ubi_major2num(int major) | |
318 | { | |
319 | int i, ubi_num = -ENODEV; | |
320 | ||
321 | spin_lock(&ubi_devices_lock); | |
322 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
323 | struct ubi_device *ubi = ubi_devices[i]; | |
324 | ||
325 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
326 | ubi_num = ubi->ubi_num; | |
327 | break; | |
328 | } | |
329 | } | |
330 | spin_unlock(&ubi_devices_lock); | |
331 | ||
332 | return ubi_num; | |
333 | } | |
334 | ||
801c135c AB |
335 | /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */ |
336 | static ssize_t dev_attribute_show(struct device *dev, | |
337 | struct device_attribute *attr, char *buf) | |
338 | { | |
e73f4459 AB |
339 | ssize_t ret; |
340 | struct ubi_device *ubi; | |
801c135c | 341 | |
e73f4459 AB |
342 | /* |
343 | * The below code looks weird, but it actually makes sense. We get the | |
344 | * UBI device reference from the contained 'struct ubi_device'. But it | |
345 | * is unclear if the device was removed or not yet. Indeed, if the | |
346 | * device was removed before we increased its reference count, | |
347 | * 'ubi_get_device()' will return -ENODEV and we fail. | |
348 | * | |
349 | * Remember, 'struct ubi_device' is freed in the release function, so | |
350 | * we still can use 'ubi->ubi_num'. | |
351 | */ | |
801c135c | 352 | ubi = container_of(dev, struct ubi_device, dev); |
e73f4459 AB |
353 | ubi = ubi_get_device(ubi->ubi_num); |
354 | if (!ubi) | |
355 | return -ENODEV; | |
356 | ||
801c135c | 357 | if (attr == &dev_eraseblock_size) |
e73f4459 | 358 | ret = sprintf(buf, "%d\n", ubi->leb_size); |
801c135c | 359 | else if (attr == &dev_avail_eraseblocks) |
e73f4459 | 360 | ret = sprintf(buf, "%d\n", ubi->avail_pebs); |
801c135c | 361 | else if (attr == &dev_total_eraseblocks) |
e73f4459 | 362 | ret = sprintf(buf, "%d\n", ubi->good_peb_count); |
801c135c | 363 | else if (attr == &dev_volumes_count) |
4b3cc340 | 364 | ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT); |
801c135c | 365 | else if (attr == &dev_max_ec) |
e73f4459 | 366 | ret = sprintf(buf, "%d\n", ubi->max_ec); |
801c135c | 367 | else if (attr == &dev_reserved_for_bad) |
e73f4459 | 368 | ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs); |
801c135c | 369 | else if (attr == &dev_bad_peb_count) |
e73f4459 | 370 | ret = sprintf(buf, "%d\n", ubi->bad_peb_count); |
801c135c | 371 | else if (attr == &dev_max_vol_count) |
e73f4459 | 372 | ret = sprintf(buf, "%d\n", ubi->vtbl_slots); |
801c135c | 373 | else if (attr == &dev_min_io_size) |
e73f4459 | 374 | ret = sprintf(buf, "%d\n", ubi->min_io_size); |
801c135c | 375 | else if (attr == &dev_bgt_enabled) |
e73f4459 | 376 | ret = sprintf(buf, "%d\n", ubi->thread_enabled); |
b6b76ba4 AB |
377 | else if (attr == &dev_mtd_num) |
378 | ret = sprintf(buf, "%d\n", ubi->mtd->index); | |
801c135c | 379 | else |
b6b76ba4 | 380 | ret = -EINVAL; |
801c135c | 381 | |
e73f4459 AB |
382 | ubi_put_device(ubi); |
383 | return ret; | |
801c135c AB |
384 | } |
385 | ||
36b477d0 AB |
386 | static void dev_release(struct device *dev) |
387 | { | |
388 | struct ubi_device *ubi = container_of(dev, struct ubi_device, dev); | |
389 | ||
390 | kfree(ubi); | |
391 | } | |
801c135c AB |
392 | |
393 | /** | |
394 | * ubi_sysfs_init - initialize sysfs for an UBI device. | |
395 | * @ubi: UBI device description object | |
0bf1c439 AB |
396 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
397 | * taken | |
801c135c AB |
398 | * |
399 | * This function returns zero in case of success and a negative error code in | |
400 | * case of failure. | |
401 | */ | |
0bf1c439 | 402 | static int ubi_sysfs_init(struct ubi_device *ubi, int *ref) |
801c135c AB |
403 | { |
404 | int err; | |
405 | ||
406 | ubi->dev.release = dev_release; | |
49dfc299 | 407 | ubi->dev.devt = ubi->cdev.dev; |
801c135c | 408 | ubi->dev.class = ubi_class; |
160bbab3 | 409 | dev_set_name(&ubi->dev, UBI_NAME_STR"%d", ubi->ubi_num); |
801c135c AB |
410 | err = device_register(&ubi->dev); |
411 | if (err) | |
db6e5770 | 412 | return err; |
801c135c | 413 | |
0bf1c439 | 414 | *ref = 1; |
801c135c AB |
415 | err = device_create_file(&ubi->dev, &dev_eraseblock_size); |
416 | if (err) | |
db6e5770 | 417 | return err; |
801c135c AB |
418 | err = device_create_file(&ubi->dev, &dev_avail_eraseblocks); |
419 | if (err) | |
db6e5770 | 420 | return err; |
801c135c AB |
421 | err = device_create_file(&ubi->dev, &dev_total_eraseblocks); |
422 | if (err) | |
db6e5770 | 423 | return err; |
801c135c AB |
424 | err = device_create_file(&ubi->dev, &dev_volumes_count); |
425 | if (err) | |
db6e5770 | 426 | return err; |
801c135c AB |
427 | err = device_create_file(&ubi->dev, &dev_max_ec); |
428 | if (err) | |
db6e5770 | 429 | return err; |
801c135c AB |
430 | err = device_create_file(&ubi->dev, &dev_reserved_for_bad); |
431 | if (err) | |
db6e5770 | 432 | return err; |
801c135c AB |
433 | err = device_create_file(&ubi->dev, &dev_bad_peb_count); |
434 | if (err) | |
db6e5770 | 435 | return err; |
801c135c AB |
436 | err = device_create_file(&ubi->dev, &dev_max_vol_count); |
437 | if (err) | |
db6e5770 | 438 | return err; |
801c135c AB |
439 | err = device_create_file(&ubi->dev, &dev_min_io_size); |
440 | if (err) | |
db6e5770 | 441 | return err; |
801c135c | 442 | err = device_create_file(&ubi->dev, &dev_bgt_enabled); |
b6b76ba4 AB |
443 | if (err) |
444 | return err; | |
445 | err = device_create_file(&ubi->dev, &dev_mtd_num); | |
801c135c AB |
446 | return err; |
447 | } | |
448 | ||
449 | /** | |
450 | * ubi_sysfs_close - close sysfs for an UBI device. | |
451 | * @ubi: UBI device description object | |
452 | */ | |
453 | static void ubi_sysfs_close(struct ubi_device *ubi) | |
454 | { | |
b6b76ba4 | 455 | device_remove_file(&ubi->dev, &dev_mtd_num); |
801c135c AB |
456 | device_remove_file(&ubi->dev, &dev_bgt_enabled); |
457 | device_remove_file(&ubi->dev, &dev_min_io_size); | |
458 | device_remove_file(&ubi->dev, &dev_max_vol_count); | |
459 | device_remove_file(&ubi->dev, &dev_bad_peb_count); | |
460 | device_remove_file(&ubi->dev, &dev_reserved_for_bad); | |
461 | device_remove_file(&ubi->dev, &dev_max_ec); | |
462 | device_remove_file(&ubi->dev, &dev_volumes_count); | |
463 | device_remove_file(&ubi->dev, &dev_total_eraseblocks); | |
464 | device_remove_file(&ubi->dev, &dev_avail_eraseblocks); | |
465 | device_remove_file(&ubi->dev, &dev_eraseblock_size); | |
466 | device_unregister(&ubi->dev); | |
467 | } | |
468 | ||
469 | /** | |
0bf1c439 | 470 | * kill_volumes - destroy all user volumes. |
801c135c AB |
471 | * @ubi: UBI device description object |
472 | */ | |
473 | static void kill_volumes(struct ubi_device *ubi) | |
474 | { | |
475 | int i; | |
476 | ||
477 | for (i = 0; i < ubi->vtbl_slots; i++) | |
478 | if (ubi->volumes[i]) | |
89b96b69 | 479 | ubi_free_volume(ubi, ubi->volumes[i]); |
801c135c AB |
480 | } |
481 | ||
482 | /** | |
483 | * uif_init - initialize user interfaces for an UBI device. | |
484 | * @ubi: UBI device description object | |
0bf1c439 AB |
485 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
486 | * taken, otherwise set to %0 | |
487 | * | |
488 | * This function initializes various user interfaces for an UBI device. If the | |
489 | * initialization fails at an early stage, this function frees all the | |
490 | * resources it allocated, returns an error, and @ref is set to %0. However, | |
491 | * if the initialization fails after the UBI device was registered in the | |
492 | * driver core subsystem, this function takes a reference to @ubi->dev, because | |
493 | * otherwise the release function ('dev_release()') would free whole @ubi | |
494 | * object. The @ref argument is set to %1 in this case. The caller has to put | |
495 | * this reference. | |
801c135c AB |
496 | * |
497 | * This function returns zero in case of success and a negative error code in | |
0bf1c439 | 498 | * case of failure. |
801c135c | 499 | */ |
0bf1c439 | 500 | static int uif_init(struct ubi_device *ubi, int *ref) |
801c135c | 501 | { |
8c4c19f1 | 502 | int i, err; |
801c135c AB |
503 | dev_t dev; |
504 | ||
0bf1c439 | 505 | *ref = 0; |
801c135c AB |
506 | sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num); |
507 | ||
508 | /* | |
509 | * Major numbers for the UBI character devices are allocated | |
510 | * dynamically. Major numbers of volume character devices are | |
511 | * equivalent to ones of the corresponding UBI character device. Minor | |
512 | * numbers of UBI character devices are 0, while minor numbers of | |
513 | * volume character devices start from 1. Thus, we allocate one major | |
514 | * number and ubi->vtbl_slots + 1 minor numbers. | |
515 | */ | |
516 | err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name); | |
517 | if (err) { | |
518 | ubi_err("cannot register UBI character devices"); | |
519 | return err; | |
520 | } | |
521 | ||
49dfc299 | 522 | ubi_assert(MINOR(dev) == 0); |
801c135c | 523 | cdev_init(&ubi->cdev, &ubi_cdev_operations); |
c8566350 | 524 | dbg_gen("%s major is %u", ubi->ubi_name, MAJOR(dev)); |
801c135c AB |
525 | ubi->cdev.owner = THIS_MODULE; |
526 | ||
801c135c AB |
527 | err = cdev_add(&ubi->cdev, dev, 1); |
528 | if (err) { | |
01f7b309 | 529 | ubi_err("cannot add character device"); |
801c135c AB |
530 | goto out_unreg; |
531 | } | |
532 | ||
0bf1c439 | 533 | err = ubi_sysfs_init(ubi, ref); |
801c135c | 534 | if (err) |
db6e5770 | 535 | goto out_sysfs; |
801c135c AB |
536 | |
537 | for (i = 0; i < ubi->vtbl_slots; i++) | |
538 | if (ubi->volumes[i]) { | |
89b96b69 | 539 | err = ubi_add_volume(ubi, ubi->volumes[i]); |
01f7b309 AB |
540 | if (err) { |
541 | ubi_err("cannot add volume %d", i); | |
801c135c | 542 | goto out_volumes; |
01f7b309 | 543 | } |
801c135c AB |
544 | } |
545 | ||
546 | return 0; | |
547 | ||
548 | out_volumes: | |
549 | kill_volumes(ubi); | |
db6e5770 | 550 | out_sysfs: |
0bf1c439 AB |
551 | if (*ref) |
552 | get_device(&ubi->dev); | |
801c135c | 553 | ubi_sysfs_close(ubi); |
801c135c AB |
554 | cdev_del(&ubi->cdev); |
555 | out_unreg: | |
49dfc299 | 556 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
01f7b309 | 557 | ubi_err("cannot initialize UBI %s, error %d", ubi->ubi_name, err); |
801c135c AB |
558 | return err; |
559 | } | |
560 | ||
561 | /** | |
562 | * uif_close - close user interfaces for an UBI device. | |
563 | * @ubi: UBI device description object | |
505d1caa AB |
564 | * |
565 | * Note, since this function un-registers UBI volume device objects (@vol->dev), | |
566 | * the memory allocated voe the volumes is freed as well (in the release | |
567 | * function). | |
801c135c AB |
568 | */ |
569 | static void uif_close(struct ubi_device *ubi) | |
570 | { | |
571 | kill_volumes(ubi); | |
572 | ubi_sysfs_close(ubi); | |
573 | cdev_del(&ubi->cdev); | |
49dfc299 | 574 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
801c135c AB |
575 | } |
576 | ||
505d1caa | 577 | /** |
47e1ec70 | 578 | * ubi_free_internal_volumes - free internal volumes. |
505d1caa AB |
579 | * @ubi: UBI device description object |
580 | */ | |
47e1ec70 | 581 | void ubi_free_internal_volumes(struct ubi_device *ubi) |
505d1caa AB |
582 | { |
583 | int i; | |
584 | ||
585 | for (i = ubi->vtbl_slots; | |
586 | i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { | |
587 | kfree(ubi->volumes[i]->eba_tbl); | |
588 | kfree(ubi->volumes[i]); | |
589 | } | |
590 | } | |
591 | ||
95e6fb02 RG |
592 | static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024) |
593 | { | |
594 | int limit, device_pebs; | |
595 | uint64_t device_size; | |
596 | ||
597 | if (!max_beb_per1024) | |
598 | return 0; | |
599 | ||
600 | /* | |
601 | * Here we are using size of the entire flash chip and | |
602 | * not just the MTD partition size because the maximum | |
603 | * number of bad eraseblocks is a percentage of the | |
604 | * whole device and bad eraseblocks are not fairly | |
605 | * distributed over the flash chip. So the worst case | |
606 | * is that all the bad eraseblocks of the chip are in | |
607 | * the MTD partition we are attaching (ubi->mtd). | |
608 | */ | |
609 | device_size = mtd_get_device_size(ubi->mtd); | |
610 | device_pebs = mtd_div_by_eb(device_size, ubi->mtd); | |
611 | limit = mult_frac(device_pebs, max_beb_per1024, 1024); | |
612 | ||
613 | /* Round it up */ | |
614 | if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs) | |
615 | limit += 1; | |
616 | ||
617 | return limit; | |
618 | } | |
619 | ||
801c135c | 620 | /** |
85c6e6e2 | 621 | * io_init - initialize I/O sub-system for a given UBI device. |
801c135c | 622 | * @ubi: UBI device description object |
256334c3 | 623 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
801c135c AB |
624 | * |
625 | * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are | |
626 | * assumed: | |
627 | * o EC header is always at offset zero - this cannot be changed; | |
628 | * o VID header starts just after the EC header at the closest address | |
cdfa788a | 629 | * aligned to @io->hdrs_min_io_size; |
801c135c | 630 | * o data starts just after the VID header at the closest address aligned to |
cdfa788a | 631 | * @io->min_io_size |
801c135c AB |
632 | * |
633 | * This function returns zero in case of success and a negative error code in | |
634 | * case of failure. | |
635 | */ | |
256334c3 | 636 | static int io_init(struct ubi_device *ubi, int max_beb_per1024) |
801c135c | 637 | { |
719bb840 AB |
638 | dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb)); |
639 | dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry)); | |
640 | ||
801c135c AB |
641 | if (ubi->mtd->numeraseregions != 0) { |
642 | /* | |
643 | * Some flashes have several erase regions. Different regions | |
644 | * may have different eraseblock size and other | |
645 | * characteristics. It looks like mostly multi-region flashes | |
646 | * have one "main" region and one or more small regions to | |
647 | * store boot loader code or boot parameters or whatever. I | |
648 | * guess we should just pick the largest region. But this is | |
649 | * not implemented. | |
650 | */ | |
651 | ubi_err("multiple regions, not implemented"); | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
dd38fccf | 655 | if (ubi->vid_hdr_offset < 0) |
cdfa788a AB |
656 | return -EINVAL; |
657 | ||
801c135c AB |
658 | /* |
659 | * Note, in this implementation we support MTD devices with 0x7FFFFFFF | |
660 | * physical eraseblocks maximum. | |
661 | */ | |
662 | ||
663 | ubi->peb_size = ubi->mtd->erasesize; | |
69423d99 | 664 | ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd); |
801c135c AB |
665 | ubi->flash_size = ubi->mtd->size; |
666 | ||
8beeb3bb | 667 | if (mtd_can_have_bb(ubi->mtd)) { |
801c135c | 668 | ubi->bad_allowed = 1; |
95e6fb02 | 669 | ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024); |
8beeb3bb | 670 | } |
801c135c | 671 | |
ebf53f42 AB |
672 | if (ubi->mtd->type == MTD_NORFLASH) { |
673 | ubi_assert(ubi->mtd->writesize == 1); | |
674 | ubi->nor_flash = 1; | |
675 | } | |
676 | ||
801c135c AB |
677 | ubi->min_io_size = ubi->mtd->writesize; |
678 | ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; | |
679 | ||
cadb40cc KP |
680 | /* |
681 | * Make sure minimal I/O unit is power of 2. Note, there is no | |
682 | * fundamental reason for this assumption. It is just an optimization | |
683 | * which allows us to avoid costly division operations. | |
684 | */ | |
7753f169 | 685 | if (!is_power_of_2(ubi->min_io_size)) { |
01f7b309 AB |
686 | ubi_err("min. I/O unit (%d) is not power of 2", |
687 | ubi->min_io_size); | |
801c135c AB |
688 | return -EINVAL; |
689 | } | |
690 | ||
691 | ubi_assert(ubi->hdrs_min_io_size > 0); | |
692 | ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size); | |
693 | ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0); | |
694 | ||
30b542ef AB |
695 | ubi->max_write_size = ubi->mtd->writebufsize; |
696 | /* | |
697 | * Maximum write size has to be greater or equivalent to min. I/O | |
698 | * size, and be multiple of min. I/O size. | |
699 | */ | |
700 | if (ubi->max_write_size < ubi->min_io_size || | |
701 | ubi->max_write_size % ubi->min_io_size || | |
702 | !is_power_of_2(ubi->max_write_size)) { | |
703 | ubi_err("bad write buffer size %d for %d min. I/O unit", | |
704 | ubi->max_write_size, ubi->min_io_size); | |
705 | return -EINVAL; | |
706 | } | |
707 | ||
801c135c AB |
708 | /* Calculate default aligned sizes of EC and VID headers */ |
709 | ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size); | |
710 | ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size); | |
711 | ||
719bb840 AB |
712 | dbg_gen("min_io_size %d", ubi->min_io_size); |
713 | dbg_gen("max_write_size %d", ubi->max_write_size); | |
714 | dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size); | |
715 | dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize); | |
716 | dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize); | |
801c135c AB |
717 | |
718 | if (ubi->vid_hdr_offset == 0) | |
719 | /* Default offset */ | |
720 | ubi->vid_hdr_offset = ubi->vid_hdr_aloffset = | |
721 | ubi->ec_hdr_alsize; | |
722 | else { | |
723 | ubi->vid_hdr_aloffset = ubi->vid_hdr_offset & | |
724 | ~(ubi->hdrs_min_io_size - 1); | |
725 | ubi->vid_hdr_shift = ubi->vid_hdr_offset - | |
726 | ubi->vid_hdr_aloffset; | |
727 | } | |
728 | ||
729 | /* Similar for the data offset */ | |
e8cfe009 | 730 | ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE; |
dd38fccf | 731 | ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size); |
801c135c | 732 | |
719bb840 AB |
733 | dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset); |
734 | dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset); | |
735 | dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift); | |
736 | dbg_gen("leb_start %d", ubi->leb_start); | |
801c135c AB |
737 | |
738 | /* The shift must be aligned to 32-bit boundary */ | |
739 | if (ubi->vid_hdr_shift % 4) { | |
740 | ubi_err("unaligned VID header shift %d", | |
741 | ubi->vid_hdr_shift); | |
742 | return -EINVAL; | |
743 | } | |
744 | ||
745 | /* Check sanity */ | |
746 | if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE || | |
747 | ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE || | |
748 | ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE || | |
cadb40cc | 749 | ubi->leb_start & (ubi->min_io_size - 1)) { |
801c135c AB |
750 | ubi_err("bad VID header (%d) or data offsets (%d)", |
751 | ubi->vid_hdr_offset, ubi->leb_start); | |
752 | return -EINVAL; | |
753 | } | |
754 | ||
b86a2c56 AB |
755 | /* |
756 | * Set maximum amount of physical erroneous eraseblocks to be 10%. | |
757 | * Erroneous PEB are those which have read errors. | |
758 | */ | |
759 | ubi->max_erroneous = ubi->peb_count / 10; | |
760 | if (ubi->max_erroneous < 16) | |
761 | ubi->max_erroneous = 16; | |
719bb840 | 762 | dbg_gen("max_erroneous %d", ubi->max_erroneous); |
b86a2c56 | 763 | |
801c135c AB |
764 | /* |
765 | * It may happen that EC and VID headers are situated in one minimal | |
766 | * I/O unit. In this case we can only accept this UBI image in | |
767 | * read-only mode. | |
768 | */ | |
769 | if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) { | |
049333ce | 770 | ubi_warn("EC and VID headers are in the same minimal I/O unit, switch to read-only mode"); |
801c135c AB |
771 | ubi->ro_mode = 1; |
772 | } | |
773 | ||
774 | ubi->leb_size = ubi->peb_size - ubi->leb_start; | |
775 | ||
776 | if (!(ubi->mtd->flags & MTD_WRITEABLE)) { | |
049333ce AB |
777 | ubi_msg("MTD device %d is write-protected, attach in read-only mode", |
778 | ubi->mtd->index); | |
801c135c AB |
779 | ubi->ro_mode = 1; |
780 | } | |
781 | ||
801c135c | 782 | /* |
fbd0107f | 783 | * Note, ideally, we have to initialize @ubi->bad_peb_count here. But |
801c135c AB |
784 | * unfortunately, MTD does not provide this information. We should loop |
785 | * over all physical eraseblocks and invoke mtd->block_is_bad() for | |
fbd0107f AB |
786 | * each physical eraseblock. So, we leave @ubi->bad_peb_count |
787 | * uninitialized so far. | |
801c135c AB |
788 | */ |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
4ccf8cff AB |
793 | /** |
794 | * autoresize - re-size the volume which has the "auto-resize" flag set. | |
795 | * @ubi: UBI device description object | |
796 | * @vol_id: ID of the volume to re-size | |
797 | * | |
fbd0107f | 798 | * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in |
4ccf8cff AB |
799 | * the volume table to the largest possible size. See comments in ubi-header.h |
800 | * for more description of the flag. Returns zero in case of success and a | |
801 | * negative error code in case of failure. | |
802 | */ | |
803 | static int autoresize(struct ubi_device *ubi, int vol_id) | |
804 | { | |
805 | struct ubi_volume_desc desc; | |
806 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
807 | int err, old_reserved_pebs = vol->reserved_pebs; | |
808 | ||
abb3e011 AB |
809 | if (ubi->ro_mode) { |
810 | ubi_warn("skip auto-resize because of R/O mode"); | |
811 | return 0; | |
812 | } | |
813 | ||
4ccf8cff AB |
814 | /* |
815 | * Clear the auto-resize flag in the volume in-memory copy of the | |
505d1caa | 816 | * volume table, and 'ubi_resize_volume()' will propagate this change |
4ccf8cff AB |
817 | * to the flash. |
818 | */ | |
819 | ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG; | |
820 | ||
821 | if (ubi->avail_pebs == 0) { | |
822 | struct ubi_vtbl_record vtbl_rec; | |
823 | ||
824 | /* | |
505d1caa | 825 | * No available PEBs to re-size the volume, clear the flag on |
4ccf8cff AB |
826 | * flash and exit. |
827 | */ | |
d856c13c | 828 | vtbl_rec = ubi->vtbl[vol_id]; |
4ccf8cff AB |
829 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
830 | if (err) | |
831 | ubi_err("cannot clean auto-resize flag for volume %d", | |
832 | vol_id); | |
833 | } else { | |
834 | desc.vol = vol; | |
835 | err = ubi_resize_volume(&desc, | |
836 | old_reserved_pebs + ubi->avail_pebs); | |
837 | if (err) | |
838 | ubi_err("cannot auto-resize volume %d", vol_id); | |
839 | } | |
840 | ||
841 | if (err) | |
842 | return err; | |
843 | ||
844 | ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id, | |
845 | vol->name, old_reserved_pebs, vol->reserved_pebs); | |
846 | return 0; | |
847 | } | |
848 | ||
801c135c | 849 | /** |
cdfa788a | 850 | * ubi_attach_mtd_dev - attach an MTD device. |
ebaaf1af | 851 | * @mtd: MTD device description object |
897a316c | 852 | * @ubi_num: number to assign to the new UBI device |
801c135c | 853 | * @vid_hdr_offset: VID header offset |
edac493d | 854 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
801c135c | 855 | * |
897a316c AB |
856 | * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number |
857 | * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in | |
505d1caa | 858 | * which case this function finds a vacant device number and assigns it |
897a316c AB |
859 | * automatically. Returns the new UBI device number in case of success and a |
860 | * negative error code in case of failure. | |
cdfa788a AB |
861 | * |
862 | * Note, the invocations of this function has to be serialized by the | |
863 | * @ubi_devices_mutex. | |
801c135c | 864 | */ |
256334c3 RG |
865 | int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, |
866 | int vid_hdr_offset, int max_beb_per1024) | |
801c135c AB |
867 | { |
868 | struct ubi_device *ubi; | |
0bf1c439 | 869 | int i, err, ref = 0; |
801c135c | 870 | |
d2f588f9 RG |
871 | if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT) |
872 | return -EINVAL; | |
873 | ||
874 | if (!max_beb_per1024) | |
875 | max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT; | |
876 | ||
cdfa788a AB |
877 | /* |
878 | * Check if we already have the same MTD device attached. | |
879 | * | |
880 | * Note, this function assumes that UBI devices creations and deletions | |
881 | * are serialized, so it does not take the &ubi_devices_lock. | |
882 | */ | |
897a316c | 883 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
b96bf4c3 | 884 | ubi = ubi_devices[i]; |
cdfa788a | 885 | if (ubi && mtd->index == ubi->mtd->index) { |
e2986827 | 886 | ubi_err("mtd%d is already attached to ubi%d", |
801c135c | 887 | mtd->index, i); |
897a316c | 888 | return -EEXIST; |
801c135c | 889 | } |
897a316c | 890 | } |
801c135c | 891 | |
897a316c AB |
892 | /* |
893 | * Make sure this MTD device is not emulated on top of an UBI volume | |
894 | * already. Well, generally this recursion works fine, but there are | |
895 | * different problems like the UBI module takes a reference to itself | |
896 | * by attaching (and thus, opening) the emulated MTD device. This | |
897 | * results in inability to unload the module. And in general it makes | |
898 | * no sense to attach emulated MTD devices, so we prohibit this. | |
899 | */ | |
900 | if (mtd->type == MTD_UBIVOLUME) { | |
049333ce AB |
901 | ubi_err("refuse attaching mtd%d - it is already emulated on top of UBI", |
902 | mtd->index); | |
897a316c AB |
903 | return -EINVAL; |
904 | } | |
905 | ||
906 | if (ubi_num == UBI_DEV_NUM_AUTO) { | |
907 | /* Search for an empty slot in the @ubi_devices array */ | |
908 | for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) | |
909 | if (!ubi_devices[ubi_num]) | |
910 | break; | |
911 | if (ubi_num == UBI_MAX_DEVICES) { | |
e2986827 | 912 | ubi_err("only %d UBI devices may be created", |
9c9ec147 | 913 | UBI_MAX_DEVICES); |
897a316c AB |
914 | return -ENFILE; |
915 | } | |
916 | } else { | |
917 | if (ubi_num >= UBI_MAX_DEVICES) | |
918 | return -EINVAL; | |
b96bf4c3 | 919 | |
897a316c AB |
920 | /* Make sure ubi_num is not busy */ |
921 | if (ubi_devices[ubi_num]) { | |
e2986827 | 922 | ubi_err("ubi%d already exists", ubi_num); |
897a316c AB |
923 | return -EEXIST; |
924 | } | |
b96bf4c3 AB |
925 | } |
926 | ||
cdfa788a AB |
927 | ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL); |
928 | if (!ubi) | |
929 | return -ENOMEM; | |
801c135c | 930 | |
cdfa788a | 931 | ubi->mtd = mtd; |
897a316c | 932 | ubi->ubi_num = ubi_num; |
801c135c | 933 | ubi->vid_hdr_offset = vid_hdr_offset; |
4ccf8cff AB |
934 | ubi->autoresize_vol_id = -1; |
935 | ||
77e6c2f0 RW |
936 | #ifdef CONFIG_MTD_UBI_FASTMAP |
937 | ubi->fm_pool.used = ubi->fm_pool.size = 0; | |
938 | ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0; | |
939 | ||
940 | /* | |
941 | * fm_pool.max_size is 5% of the total number of PEBs but it's also | |
942 | * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE. | |
943 | */ | |
944 | ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size, | |
945 | ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE); | |
946 | if (ubi->fm_pool.max_size < UBI_FM_MIN_POOL_SIZE) | |
947 | ubi->fm_pool.max_size = UBI_FM_MIN_POOL_SIZE; | |
948 | ||
949 | ubi->fm_wl_pool.max_size = UBI_FM_WL_POOL_SIZE; | |
950 | ubi->fm_disabled = !fm_autoconvert; | |
951 | ||
952 | if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) | |
953 | <= UBI_FM_MAX_START) { | |
954 | ubi_err("More than %i PEBs are needed for fastmap, sorry.", | |
955 | UBI_FM_MAX_START); | |
956 | ubi->fm_disabled = 1; | |
957 | } | |
958 | ||
959 | ubi_msg("default fastmap pool size: %d", ubi->fm_pool.max_size); | |
960 | ubi_msg("default fastmap WL pool size: %d", ubi->fm_wl_pool.max_size); | |
961 | #else | |
962 | ubi->fm_disabled = 1; | |
963 | #endif | |
4ccf8cff AB |
964 | mutex_init(&ubi->buf_mutex); |
965 | mutex_init(&ubi->ckvol_mutex); | |
f089c0b2 | 966 | mutex_init(&ubi->device_mutex); |
4ccf8cff | 967 | spin_lock_init(&ubi->volumes_lock); |
77e6c2f0 RW |
968 | mutex_init(&ubi->fm_mutex); |
969 | init_rwsem(&ubi->fm_sem); | |
cdfa788a | 970 | |
697fa972 | 971 | ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num); |
cdfa788a | 972 | |
256334c3 | 973 | err = io_init(ubi, max_beb_per1024); |
801c135c AB |
974 | if (err) |
975 | goto out_free; | |
976 | ||
ad5942ba | 977 | err = -ENOMEM; |
0ca39d74 AB |
978 | ubi->peb_buf = vmalloc(ubi->peb_size); |
979 | if (!ubi->peb_buf) | |
e88d6e10 AB |
980 | goto out_free; |
981 | ||
77e6c2f0 RW |
982 | #ifdef CONFIG_MTD_UBI_FASTMAP |
983 | ubi->fm_size = ubi_calc_fm_size(ubi); | |
984 | ubi->fm_buf = vzalloc(ubi->fm_size); | |
985 | if (!ubi->fm_buf) | |
986 | goto out_free; | |
987 | #endif | |
dac6e208 | 988 | err = ubi_attach(ubi, 0); |
801c135c | 989 | if (err) { |
47e1ec70 | 990 | ubi_err("failed to attach mtd%d, error %d", mtd->index, err); |
eab73772 | 991 | goto out_free; |
801c135c AB |
992 | } |
993 | ||
4ccf8cff AB |
994 | if (ubi->autoresize_vol_id != -1) { |
995 | err = autoresize(ubi, ubi->autoresize_vol_id); | |
996 | if (err) | |
997 | goto out_detach; | |
998 | } | |
999 | ||
0bf1c439 | 1000 | err = uif_init(ubi, &ref); |
801c135c | 1001 | if (err) |
0bf1c439 | 1002 | goto out_detach; |
801c135c | 1003 | |
2a734bb8 AB |
1004 | err = ubi_debugfs_init_dev(ubi); |
1005 | if (err) | |
1006 | goto out_uif; | |
1007 | ||
cdfa788a AB |
1008 | ubi->bgt_thread = kthread_create(ubi_thread, ubi, ubi->bgt_name); |
1009 | if (IS_ERR(ubi->bgt_thread)) { | |
1010 | err = PTR_ERR(ubi->bgt_thread); | |
1011 | ubi_err("cannot spawn \"%s\", error %d", ubi->bgt_name, | |
1012 | err); | |
2a734bb8 | 1013 | goto out_debugfs; |
cdfa788a AB |
1014 | } |
1015 | ||
719bb840 AB |
1016 | ubi_msg("attached mtd%d (name \"%s\", size %llu MiB) to ubi%d", |
1017 | mtd->index, mtd->name, ubi->flash_size >> 20, ubi_num); | |
1018 | ubi_msg("PEB size: %d bytes (%d KiB), LEB size: %d bytes", | |
1019 | ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size); | |
1020 | ubi_msg("min./max. I/O unit sizes: %d/%d, sub-page size %d", | |
1021 | ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size); | |
1022 | ubi_msg("VID header offset: %d (aligned %d), data offset: %d", | |
1023 | ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start); | |
1024 | ubi_msg("good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d", | |
1025 | ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count); | |
1026 | ubi_msg("user volume: %d, internal volumes: %d, max. volumes count: %d", | |
1027 | ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT, | |
1028 | ubi->vtbl_slots); | |
1029 | ubi_msg("max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u", | |
1030 | ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD, | |
1031 | ubi->image_seq); | |
1032 | ubi_msg("available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d", | |
1033 | ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs); | |
801c135c | 1034 | |
ddbd3b61 AB |
1035 | /* |
1036 | * The below lock makes sure we do not race with 'ubi_thread()' which | |
1037 | * checks @ubi->thread_enabled. Otherwise we may fail to wake it up. | |
1038 | */ | |
1039 | spin_lock(&ubi->wl_lock); | |
28237e45 | 1040 | ubi->thread_enabled = 1; |
d37e6bf6 | 1041 | wake_up_process(ubi->bgt_thread); |
ddbd3b61 | 1042 | spin_unlock(&ubi->wl_lock); |
801c135c | 1043 | |
897a316c | 1044 | ubi_devices[ubi_num] = ubi; |
0e0ee1cc | 1045 | ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL); |
897a316c | 1046 | return ubi_num; |
801c135c | 1047 | |
2a734bb8 AB |
1048 | out_debugfs: |
1049 | ubi_debugfs_exit_dev(ubi); | |
cdfa788a | 1050 | out_uif: |
01a4110d AB |
1051 | get_device(&ubi->dev); |
1052 | ubi_assert(ref); | |
cdfa788a | 1053 | uif_close(ubi); |
801c135c | 1054 | out_detach: |
801c135c | 1055 | ubi_wl_close(ubi); |
47e1ec70 | 1056 | ubi_free_internal_volumes(ubi); |
d7f0c4dc | 1057 | vfree(ubi->vtbl); |
801c135c | 1058 | out_free: |
0ca39d74 | 1059 | vfree(ubi->peb_buf); |
77e6c2f0 | 1060 | vfree(ubi->fm_buf); |
0bf1c439 AB |
1061 | if (ref) |
1062 | put_device(&ubi->dev); | |
1063 | else | |
1064 | kfree(ubi); | |
801c135c AB |
1065 | return err; |
1066 | } | |
1067 | ||
1068 | /** | |
cdfa788a AB |
1069 | * ubi_detach_mtd_dev - detach an MTD device. |
1070 | * @ubi_num: UBI device number to detach from | |
1071 | * @anyway: detach MTD even if device reference count is not zero | |
1072 | * | |
1073 | * This function destroys an UBI device number @ubi_num and detaches the | |
1074 | * underlying MTD device. Returns zero in case of success and %-EBUSY if the | |
1075 | * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not | |
1076 | * exist. | |
1077 | * | |
1078 | * Note, the invocations of this function has to be serialized by the | |
1079 | * @ubi_devices_mutex. | |
801c135c | 1080 | */ |
cdfa788a | 1081 | int ubi_detach_mtd_dev(int ubi_num, int anyway) |
801c135c | 1082 | { |
cdfa788a AB |
1083 | struct ubi_device *ubi; |
1084 | ||
1085 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
1086 | return -EINVAL; | |
1087 | ||
0e0ee1cc DP |
1088 | ubi = ubi_get_device(ubi_num); |
1089 | if (!ubi) | |
cdfa788a | 1090 | return -EINVAL; |
cdfa788a | 1091 | |
0e0ee1cc DP |
1092 | spin_lock(&ubi_devices_lock); |
1093 | put_device(&ubi->dev); | |
1094 | ubi->ref_count -= 1; | |
cdfa788a AB |
1095 | if (ubi->ref_count) { |
1096 | if (!anyway) { | |
897a316c | 1097 | spin_unlock(&ubi_devices_lock); |
cdfa788a AB |
1098 | return -EBUSY; |
1099 | } | |
1100 | /* This may only happen if there is a bug */ | |
1101 | ubi_err("%s reference count %d, destroy anyway", | |
1102 | ubi->ubi_name, ubi->ref_count); | |
1103 | } | |
897a316c | 1104 | ubi_devices[ubi_num] = NULL; |
cdfa788a AB |
1105 | spin_unlock(&ubi_devices_lock); |
1106 | ||
897a316c | 1107 | ubi_assert(ubi_num == ubi->ubi_num); |
0e0ee1cc | 1108 | ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL); |
719bb840 | 1109 | ubi_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num); |
77e6c2f0 RW |
1110 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1111 | /* If we don't write a new fastmap at detach time we lose all | |
1112 | * EC updates that have been made since the last written fastmap. */ | |
1113 | ubi_update_fastmap(ubi); | |
1114 | #endif | |
cdfa788a AB |
1115 | /* |
1116 | * Before freeing anything, we have to stop the background thread to | |
1117 | * prevent it from doing anything on this device while we are freeing. | |
1118 | */ | |
1119 | if (ubi->bgt_thread) | |
1120 | kthread_stop(ubi->bgt_thread); | |
801c135c | 1121 | |
36b477d0 AB |
1122 | /* |
1123 | * Get a reference to the device in order to prevent 'dev_release()' | |
0bf1c439 | 1124 | * from freeing the @ubi object. |
36b477d0 AB |
1125 | */ |
1126 | get_device(&ubi->dev); | |
1127 | ||
2a734bb8 | 1128 | ubi_debugfs_exit_dev(ubi); |
801c135c | 1129 | uif_close(ubi); |
77e6c2f0 | 1130 | |
801c135c | 1131 | ubi_wl_close(ubi); |
47e1ec70 | 1132 | ubi_free_internal_volumes(ubi); |
92ad8f37 | 1133 | vfree(ubi->vtbl); |
801c135c | 1134 | put_mtd_device(ubi->mtd); |
0ca39d74 | 1135 | vfree(ubi->peb_buf); |
77e6c2f0 | 1136 | vfree(ubi->fm_buf); |
cdfa788a | 1137 | ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num); |
36b477d0 | 1138 | put_device(&ubi->dev); |
cdfa788a | 1139 | return 0; |
801c135c AB |
1140 | } |
1141 | ||
cdfa788a | 1142 | /** |
f9b0080e AB |
1143 | * open_mtd_by_chdev - open an MTD device by its character device node path. |
1144 | * @mtd_dev: MTD character device node path | |
1145 | * | |
1146 | * This helper function opens an MTD device by its character node device path. | |
1147 | * Returns MTD device description object in case of success and a negative | |
1148 | * error code in case of failure. | |
1149 | */ | |
1150 | static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev) | |
1151 | { | |
1152 | int err, major, minor, mode; | |
1153 | struct path path; | |
1154 | ||
1155 | /* Probably this is an MTD character device node path */ | |
1156 | err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path); | |
1157 | if (err) | |
1158 | return ERR_PTR(err); | |
1159 | ||
1160 | /* MTD device number is defined by the major / minor numbers */ | |
1161 | major = imajor(path.dentry->d_inode); | |
1162 | minor = iminor(path.dentry->d_inode); | |
1163 | mode = path.dentry->d_inode->i_mode; | |
1164 | path_put(&path); | |
1165 | if (major != MTD_CHAR_MAJOR || !S_ISCHR(mode)) | |
1166 | return ERR_PTR(-EINVAL); | |
1167 | ||
1168 | if (minor & 1) | |
1169 | /* | |
1170 | * Just do not think the "/dev/mtdrX" devices support is need, | |
1171 | * so do not support them to avoid doing extra work. | |
1172 | */ | |
1173 | return ERR_PTR(-EINVAL); | |
1174 | ||
1175 | return get_mtd_device(NULL, minor / 2); | |
1176 | } | |
1177 | ||
1178 | /** | |
1179 | * open_mtd_device - open MTD device by name, character device path, or number. | |
1180 | * @mtd_dev: name, character device node path, or MTD device device number | |
cdfa788a | 1181 | * |
d1f3dd6c | 1182 | * This function tries to open and MTD device described by @mtd_dev string, |
f9b0080e AB |
1183 | * which is first treated as ASCII MTD device number, and if it is not true, it |
1184 | * is treated as MTD device name, and if that is also not true, it is treated | |
1185 | * as MTD character device node path. Returns MTD device description object in | |
1186 | * case of success and a negative error code in case of failure. | |
cdfa788a AB |
1187 | */ |
1188 | static struct mtd_info * __init open_mtd_device(const char *mtd_dev) | |
1189 | { | |
1190 | struct mtd_info *mtd; | |
d1f3dd6c AB |
1191 | int mtd_num; |
1192 | char *endp; | |
cdfa788a | 1193 | |
d1f3dd6c AB |
1194 | mtd_num = simple_strtoul(mtd_dev, &endp, 0); |
1195 | if (*endp != '\0' || mtd_dev == endp) { | |
cdfa788a | 1196 | /* |
d1f3dd6c AB |
1197 | * This does not look like an ASCII integer, probably this is |
1198 | * MTD device name. | |
cdfa788a | 1199 | */ |
d1f3dd6c | 1200 | mtd = get_mtd_device_nm(mtd_dev); |
f9b0080e AB |
1201 | if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV) |
1202 | /* Probably this is an MTD character device node path */ | |
1203 | mtd = open_mtd_by_chdev(mtd_dev); | |
d1f3dd6c | 1204 | } else |
cdfa788a | 1205 | mtd = get_mtd_device(NULL, mtd_num); |
cdfa788a AB |
1206 | |
1207 | return mtd; | |
1208 | } | |
1209 | ||
801c135c AB |
1210 | static int __init ubi_init(void) |
1211 | { | |
1212 | int err, i, k; | |
1213 | ||
1214 | /* Ensure that EC and VID headers have correct size */ | |
1215 | BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64); | |
1216 | BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64); | |
1217 | ||
1218 | if (mtd_devs > UBI_MAX_DEVICES) { | |
c4506092 | 1219 | ubi_err("too many MTD devices, maximum is %d", UBI_MAX_DEVICES); |
801c135c AB |
1220 | return -EINVAL; |
1221 | } | |
1222 | ||
9f961b57 | 1223 | /* Create base sysfs directory and sysfs files */ |
801c135c | 1224 | ubi_class = class_create(THIS_MODULE, UBI_NAME_STR); |
9f961b57 AB |
1225 | if (IS_ERR(ubi_class)) { |
1226 | err = PTR_ERR(ubi_class); | |
c4506092 | 1227 | ubi_err("cannot create UBI class"); |
9f961b57 AB |
1228 | goto out; |
1229 | } | |
801c135c AB |
1230 | |
1231 | err = class_create_file(ubi_class, &ubi_version); | |
9f961b57 | 1232 | if (err) { |
c4506092 | 1233 | ubi_err("cannot create sysfs file"); |
801c135c | 1234 | goto out_class; |
9f961b57 AB |
1235 | } |
1236 | ||
1237 | err = misc_register(&ubi_ctrl_cdev); | |
1238 | if (err) { | |
c4506092 | 1239 | ubi_err("cannot register device"); |
9f961b57 AB |
1240 | goto out_version; |
1241 | } | |
801c135c | 1242 | |
06b68ba1 | 1243 | ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab", |
c4506092 AB |
1244 | sizeof(struct ubi_wl_entry), |
1245 | 0, 0, NULL); | |
06b68ba1 | 1246 | if (!ubi_wl_entry_slab) |
b9a06623 | 1247 | goto out_dev_unreg; |
06b68ba1 | 1248 | |
2a734bb8 AB |
1249 | err = ubi_debugfs_init(); |
1250 | if (err) | |
1251 | goto out_slab; | |
1252 | ||
1253 | ||
801c135c AB |
1254 | /* Attach MTD devices */ |
1255 | for (i = 0; i < mtd_devs; i++) { | |
1256 | struct mtd_dev_param *p = &mtd_dev_param[i]; | |
cdfa788a | 1257 | struct mtd_info *mtd; |
801c135c AB |
1258 | |
1259 | cond_resched(); | |
cdfa788a AB |
1260 | |
1261 | mtd = open_mtd_device(p->name); | |
1262 | if (IS_ERR(mtd)) { | |
1263 | err = PTR_ERR(mtd); | |
1264 | goto out_detach; | |
1265 | } | |
1266 | ||
1267 | mutex_lock(&ubi_devices_mutex); | |
897a316c | 1268 | err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, |
edac493d | 1269 | p->vid_hdr_offs, p->max_beb_per1024); |
cdfa788a AB |
1270 | mutex_unlock(&ubi_devices_mutex); |
1271 | if (err < 0) { | |
c4506092 | 1272 | ubi_err("cannot attach mtd%d", mtd->index); |
af7ad7a0 MKB |
1273 | put_mtd_device(mtd); |
1274 | ||
1275 | /* | |
1276 | * Originally UBI stopped initializing on any error. | |
1277 | * However, later on it was found out that this | |
1278 | * behavior is not very good when UBI is compiled into | |
1279 | * the kernel and the MTD devices to attach are passed | |
1280 | * through the command line. Indeed, UBI failure | |
1281 | * stopped whole boot sequence. | |
1282 | * | |
1283 | * To fix this, we changed the behavior for the | |
1284 | * non-module case, but preserved the old behavior for | |
1285 | * the module case, just for compatibility. This is a | |
1286 | * little inconsistent, though. | |
1287 | */ | |
1288 | if (ubi_is_module()) | |
1289 | goto out_detach; | |
9f961b57 | 1290 | } |
801c135c AB |
1291 | } |
1292 | ||
1293 | return 0; | |
1294 | ||
1295 | out_detach: | |
1296 | for (k = 0; k < i; k++) | |
cdfa788a AB |
1297 | if (ubi_devices[k]) { |
1298 | mutex_lock(&ubi_devices_mutex); | |
1299 | ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1); | |
1300 | mutex_unlock(&ubi_devices_mutex); | |
1301 | } | |
2a734bb8 AB |
1302 | ubi_debugfs_exit(); |
1303 | out_slab: | |
06b68ba1 | 1304 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 AB |
1305 | out_dev_unreg: |
1306 | misc_deregister(&ubi_ctrl_cdev); | |
3a8d4642 | 1307 | out_version: |
801c135c AB |
1308 | class_remove_file(ubi_class, &ubi_version); |
1309 | out_class: | |
1310 | class_destroy(ubi_class); | |
9f961b57 | 1311 | out: |
c4506092 | 1312 | ubi_err("UBI error: cannot initialize UBI, error %d", err); |
801c135c AB |
1313 | return err; |
1314 | } | |
cf38aca5 | 1315 | late_initcall(ubi_init); |
801c135c AB |
1316 | |
1317 | static void __exit ubi_exit(void) | |
1318 | { | |
b96bf4c3 | 1319 | int i; |
801c135c | 1320 | |
b96bf4c3 | 1321 | for (i = 0; i < UBI_MAX_DEVICES; i++) |
cdfa788a AB |
1322 | if (ubi_devices[i]) { |
1323 | mutex_lock(&ubi_devices_mutex); | |
1324 | ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1); | |
1325 | mutex_unlock(&ubi_devices_mutex); | |
1326 | } | |
2a734bb8 | 1327 | ubi_debugfs_exit(); |
06b68ba1 | 1328 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 | 1329 | misc_deregister(&ubi_ctrl_cdev); |
801c135c AB |
1330 | class_remove_file(ubi_class, &ubi_version); |
1331 | class_destroy(ubi_class); | |
1332 | } | |
1333 | module_exit(ubi_exit); | |
1334 | ||
1335 | /** | |
ebaaf1af | 1336 | * bytes_str_to_int - convert a number of bytes string into an integer. |
801c135c AB |
1337 | * @str: the string to convert |
1338 | * | |
1339 | * This function returns positive resulting integer in case of success and a | |
1340 | * negative error code in case of failure. | |
1341 | */ | |
1342 | static int __init bytes_str_to_int(const char *str) | |
1343 | { | |
1344 | char *endp; | |
1345 | unsigned long result; | |
1346 | ||
1347 | result = simple_strtoul(str, &endp, 0); | |
774b1382 | 1348 | if (str == endp || result >= INT_MAX) { |
e28453bb | 1349 | ubi_err("UBI error: incorrect bytes count: \"%s\"\n", str); |
801c135c AB |
1350 | return -EINVAL; |
1351 | } | |
1352 | ||
1353 | switch (*endp) { | |
1354 | case 'G': | |
1355 | result *= 1024; | |
1356 | case 'M': | |
1357 | result *= 1024; | |
1358 | case 'K': | |
801c135c | 1359 | result *= 1024; |
aeddb877 | 1360 | if (endp[1] == 'i' && endp[2] == 'B') |
801c135c AB |
1361 | endp += 2; |
1362 | case '\0': | |
1363 | break; | |
1364 | default: | |
e28453bb | 1365 | ubi_err("UBI error: incorrect bytes count: \"%s\"\n", str); |
801c135c AB |
1366 | return -EINVAL; |
1367 | } | |
1368 | ||
1369 | return result; | |
1370 | } | |
1371 | ||
1372 | /** | |
1373 | * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter. | |
1374 | * @val: the parameter value to parse | |
1375 | * @kp: not used | |
1376 | * | |
1377 | * This function returns zero in case of success and a negative error code in | |
1378 | * case of error. | |
1379 | */ | |
1380 | static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp) | |
1381 | { | |
1382 | int i, len; | |
1383 | struct mtd_dev_param *p; | |
1384 | char buf[MTD_PARAM_LEN_MAX]; | |
1385 | char *pbuf = &buf[0]; | |
5993f9b7 | 1386 | char *tokens[MTD_PARAM_MAX_COUNT]; |
801c135c | 1387 | |
77c722dd AB |
1388 | if (!val) |
1389 | return -EINVAL; | |
1390 | ||
801c135c | 1391 | if (mtd_devs == UBI_MAX_DEVICES) { |
e28453bb AB |
1392 | ubi_err("UBI error: too many parameters, max. is %d\n", |
1393 | UBI_MAX_DEVICES); | |
801c135c AB |
1394 | return -EINVAL; |
1395 | } | |
1396 | ||
1397 | len = strnlen(val, MTD_PARAM_LEN_MAX); | |
1398 | if (len == MTD_PARAM_LEN_MAX) { | |
e28453bb AB |
1399 | ubi_err("UBI error: parameter \"%s\" is too long, max. is %d\n", |
1400 | val, MTD_PARAM_LEN_MAX); | |
801c135c AB |
1401 | return -EINVAL; |
1402 | } | |
1403 | ||
1404 | if (len == 0) { | |
e28453bb | 1405 | pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n"); |
801c135c AB |
1406 | return 0; |
1407 | } | |
1408 | ||
1409 | strcpy(buf, val); | |
1410 | ||
1411 | /* Get rid of the final newline */ | |
1412 | if (buf[len - 1] == '\n') | |
503990eb | 1413 | buf[len - 1] = '\0'; |
801c135c | 1414 | |
5993f9b7 | 1415 | for (i = 0; i < MTD_PARAM_MAX_COUNT; i++) |
801c135c AB |
1416 | tokens[i] = strsep(&pbuf, ","); |
1417 | ||
1418 | if (pbuf) { | |
e28453bb | 1419 | ubi_err("UBI error: too many arguments at \"%s\"\n", val); |
801c135c AB |
1420 | return -EINVAL; |
1421 | } | |
1422 | ||
801c135c AB |
1423 | p = &mtd_dev_param[mtd_devs]; |
1424 | strcpy(&p->name[0], tokens[0]); | |
1425 | ||
1426 | if (tokens[1]) | |
1427 | p->vid_hdr_offs = bytes_str_to_int(tokens[1]); | |
801c135c AB |
1428 | |
1429 | if (p->vid_hdr_offs < 0) | |
1430 | return p->vid_hdr_offs; | |
801c135c | 1431 | |
edac493d RG |
1432 | if (tokens[2]) { |
1433 | int err = kstrtoint(tokens[2], 10, &p->max_beb_per1024); | |
1434 | ||
1435 | if (err) { | |
e28453bb AB |
1436 | ubi_err("UBI error: bad value for max_beb_per1024 parameter: %s", |
1437 | tokens[2]); | |
edac493d RG |
1438 | return -EINVAL; |
1439 | } | |
1440 | } | |
1441 | ||
801c135c AB |
1442 | mtd_devs += 1; |
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000); | |
edac493d | 1447 | MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024]].\n" |
801c135c | 1448 | "Multiple \"mtd\" parameters may be specified.\n" |
edac493d RG |
1449 | "MTD devices may be specified by their number, name, or path to the MTD character device node.\n" |
1450 | "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n" | |
1451 | "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value (" | |
1452 | __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n" | |
1453 | "\n" | |
1454 | "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n" | |
1455 | "Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n" | |
1456 | "Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n" | |
1457 | "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device)."); | |
77e6c2f0 RW |
1458 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1459 | module_param(fm_autoconvert, bool, 0644); | |
1460 | MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap."); | |
1461 | #endif | |
801c135c AB |
1462 | MODULE_VERSION(__stringify(UBI_VERSION)); |
1463 | MODULE_DESCRIPTION("UBI - Unsorted Block Images"); | |
1464 | MODULE_AUTHOR("Artem Bityutskiy"); | |
1465 | MODULE_LICENSE("GPL"); |