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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> |
f83c3838 | 44 | #include <linux/major.h> |
801c135c AB |
45 | #include "ubi.h" |
46 | ||
47 | /* Maximum length of the 'mtd=' parameter */ | |
48 | #define MTD_PARAM_LEN_MAX 64 | |
49 | ||
5993f9b7 | 50 | /* Maximum number of comma-separated items in the 'mtd=' parameter */ |
83ff59a0 | 51 | #define MTD_PARAM_MAX_COUNT 4 |
5993f9b7 | 52 | |
d2f588f9 RG |
53 | /* Maximum value for the number of bad PEBs per 1024 PEBs */ |
54 | #define MAX_MTD_UBI_BEB_LIMIT 768 | |
55 | ||
af7ad7a0 MKB |
56 | #ifdef CONFIG_MTD_UBI_MODULE |
57 | #define ubi_is_module() 1 | |
58 | #else | |
59 | #define ubi_is_module() 0 | |
60 | #endif | |
61 | ||
801c135c AB |
62 | /** |
63 | * struct mtd_dev_param - MTD device parameter description data structure. | |
f9b0080e AB |
64 | * @name: MTD character device node path, MTD device name, or MTD device number |
65 | * string | |
801c135c | 66 | * @vid_hdr_offs: VID header offset |
edac493d | 67 | * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs |
801c135c | 68 | */ |
9c9ec147 | 69 | struct mtd_dev_param { |
801c135c | 70 | char name[MTD_PARAM_LEN_MAX]; |
83ff59a0 | 71 | int ubi_num; |
801c135c | 72 | int vid_hdr_offs; |
edac493d | 73 | int max_beb_per1024; |
801c135c AB |
74 | }; |
75 | ||
76 | /* Numbers of elements set in the @mtd_dev_param array */ | |
9e0c7ef3 | 77 | static int __initdata mtd_devs; |
801c135c AB |
78 | |
79 | /* MTD devices specification parameters */ | |
9e0c7ef3 | 80 | static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES]; |
77e6c2f0 RW |
81 | #ifdef CONFIG_MTD_UBI_FASTMAP |
82 | /* UBI module parameter to enable fastmap automatically on non-fastmap images */ | |
83 | static bool fm_autoconvert; | |
479c2c0c | 84 | static bool fm_debug; |
77e6c2f0 | 85 | #endif |
801c135c | 86 | |
06b68ba1 AB |
87 | /* Slab cache for wear-leveling entries */ |
88 | struct kmem_cache *ubi_wl_entry_slab; | |
89 | ||
9f961b57 AB |
90 | /* UBI control character device */ |
91 | static struct miscdevice ubi_ctrl_cdev = { | |
92 | .minor = MISC_DYNAMIC_MINOR, | |
93 | .name = "ubi_ctrl", | |
94 | .fops = &ubi_ctrl_cdev_operations, | |
95 | }; | |
06b68ba1 | 96 | |
e73f4459 AB |
97 | /* All UBI devices in system */ |
98 | static struct ubi_device *ubi_devices[UBI_MAX_DEVICES]; | |
99 | ||
cdfa788a AB |
100 | /* Serializes UBI devices creations and removals */ |
101 | DEFINE_MUTEX(ubi_devices_mutex); | |
102 | ||
e73f4459 AB |
103 | /* Protects @ubi_devices and @ubi->ref_count */ |
104 | static DEFINE_SPINLOCK(ubi_devices_lock); | |
105 | ||
801c135c | 106 | /* "Show" method for files in '/<sysfs>/class/ubi/' */ |
c174a08c AB |
107 | static ssize_t ubi_version_show(struct class *class, |
108 | struct class_attribute *attr, char *buf) | |
801c135c AB |
109 | { |
110 | return sprintf(buf, "%d\n", UBI_VERSION); | |
111 | } | |
112 | ||
113 | /* UBI version attribute ('/<sysfs>/class/ubi/version') */ | |
53cd255c TI |
114 | static struct class_attribute ubi_class_attrs[] = { |
115 | __ATTR(version, S_IRUGO, ubi_version_show, NULL), | |
116 | __ATTR_NULL | |
117 | }; | |
118 | ||
119 | /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */ | |
120 | struct class ubi_class = { | |
121 | .name = UBI_NAME_STR, | |
122 | .owner = THIS_MODULE, | |
123 | .class_attrs = ubi_class_attrs, | |
124 | }; | |
801c135c AB |
125 | |
126 | static ssize_t dev_attribute_show(struct device *dev, | |
127 | struct device_attribute *attr, char *buf); | |
128 | ||
129 | /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */ | |
130 | static struct device_attribute dev_eraseblock_size = | |
131 | __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL); | |
132 | static struct device_attribute dev_avail_eraseblocks = | |
133 | __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
134 | static struct device_attribute dev_total_eraseblocks = | |
135 | __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
136 | static struct device_attribute dev_volumes_count = | |
137 | __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL); | |
138 | static struct device_attribute dev_max_ec = | |
139 | __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL); | |
140 | static struct device_attribute dev_reserved_for_bad = | |
141 | __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL); | |
142 | static struct device_attribute dev_bad_peb_count = | |
143 | __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL); | |
144 | static struct device_attribute dev_max_vol_count = | |
145 | __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL); | |
146 | static struct device_attribute dev_min_io_size = | |
147 | __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL); | |
148 | static struct device_attribute dev_bgt_enabled = | |
149 | __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL); | |
b6b76ba4 AB |
150 | static struct device_attribute dev_mtd_num = |
151 | __ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL); | |
801c135c | 152 | |
0e0ee1cc DP |
153 | /** |
154 | * ubi_volume_notify - send a volume change notification. | |
155 | * @ubi: UBI device description object | |
156 | * @vol: volume description object of the changed volume | |
157 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
158 | * | |
159 | * This is a helper function which notifies all subscribers about a volume | |
160 | * change event (creation, removal, re-sizing, re-naming, updating). Returns | |
161 | * zero in case of success and a negative error code in case of failure. | |
162 | */ | |
163 | int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype) | |
164 | { | |
84b678f4 | 165 | int ret; |
0e0ee1cc DP |
166 | struct ubi_notification nt; |
167 | ||
168 | ubi_do_get_device_info(ubi, &nt.di); | |
169 | ubi_do_get_volume_info(ubi, vol, &nt.vi); | |
77e6c2f0 | 170 | |
77e6c2f0 RW |
171 | switch (ntype) { |
172 | case UBI_VOLUME_ADDED: | |
173 | case UBI_VOLUME_REMOVED: | |
174 | case UBI_VOLUME_RESIZED: | |
175 | case UBI_VOLUME_RENAMED: | |
84b678f4 RW |
176 | ret = ubi_update_fastmap(ubi); |
177 | if (ret) | |
178 | ubi_msg(ubi, "Unable to write a new fastmap: %i", ret); | |
77e6c2f0 | 179 | } |
84b678f4 | 180 | |
0e0ee1cc DP |
181 | return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt); |
182 | } | |
183 | ||
184 | /** | |
185 | * ubi_notify_all - send a notification to all volumes. | |
186 | * @ubi: UBI device description object | |
187 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
188 | * @nb: the notifier to call | |
189 | * | |
190 | * This function walks all volumes of UBI device @ubi and sends the @ntype | |
191 | * notification for each volume. If @nb is %NULL, then all registered notifiers | |
192 | * are called, otherwise only the @nb notifier is called. Returns the number of | |
193 | * sent notifications. | |
194 | */ | |
195 | int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb) | |
196 | { | |
197 | struct ubi_notification nt; | |
198 | int i, count = 0; | |
199 | ||
200 | ubi_do_get_device_info(ubi, &nt.di); | |
201 | ||
202 | mutex_lock(&ubi->device_mutex); | |
203 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
204 | /* | |
205 | * Since the @ubi->device is locked, and we are not going to | |
206 | * change @ubi->volumes, we do not have to lock | |
207 | * @ubi->volumes_lock. | |
208 | */ | |
209 | if (!ubi->volumes[i]) | |
210 | continue; | |
211 | ||
212 | ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi); | |
213 | if (nb) | |
214 | nb->notifier_call(nb, ntype, &nt); | |
215 | else | |
216 | blocking_notifier_call_chain(&ubi_notifiers, ntype, | |
217 | &nt); | |
218 | count += 1; | |
219 | } | |
220 | mutex_unlock(&ubi->device_mutex); | |
221 | ||
222 | return count; | |
223 | } | |
224 | ||
225 | /** | |
226 | * ubi_enumerate_volumes - send "add" notification for all existing volumes. | |
227 | * @nb: the notifier to call | |
228 | * | |
229 | * This function walks all UBI devices and volumes and sends the | |
230 | * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all | |
231 | * registered notifiers are called, otherwise only the @nb notifier is called. | |
232 | * Returns the number of sent notifications. | |
233 | */ | |
234 | int ubi_enumerate_volumes(struct notifier_block *nb) | |
235 | { | |
236 | int i, count = 0; | |
237 | ||
238 | /* | |
239 | * Since the @ubi_devices_mutex is locked, and we are not going to | |
240 | * change @ubi_devices, we do not have to lock @ubi_devices_lock. | |
241 | */ | |
242 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
243 | struct ubi_device *ubi = ubi_devices[i]; | |
244 | ||
245 | if (!ubi) | |
246 | continue; | |
247 | count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb); | |
248 | } | |
249 | ||
250 | return count; | |
251 | } | |
252 | ||
e73f4459 AB |
253 | /** |
254 | * ubi_get_device - get UBI device. | |
255 | * @ubi_num: UBI device number | |
256 | * | |
257 | * This function returns UBI device description object for UBI device number | |
258 | * @ubi_num, or %NULL if the device does not exist. This function increases the | |
259 | * device reference count to prevent removal of the device. In other words, the | |
260 | * device cannot be removed if its reference count is not zero. | |
261 | */ | |
262 | struct ubi_device *ubi_get_device(int ubi_num) | |
263 | { | |
264 | struct ubi_device *ubi; | |
265 | ||
266 | spin_lock(&ubi_devices_lock); | |
267 | ubi = ubi_devices[ubi_num]; | |
268 | if (ubi) { | |
269 | ubi_assert(ubi->ref_count >= 0); | |
270 | ubi->ref_count += 1; | |
271 | get_device(&ubi->dev); | |
272 | } | |
273 | spin_unlock(&ubi_devices_lock); | |
274 | ||
275 | return ubi; | |
276 | } | |
277 | ||
278 | /** | |
279 | * ubi_put_device - drop an UBI device reference. | |
280 | * @ubi: UBI device description object | |
281 | */ | |
282 | void ubi_put_device(struct ubi_device *ubi) | |
283 | { | |
284 | spin_lock(&ubi_devices_lock); | |
285 | ubi->ref_count -= 1; | |
286 | put_device(&ubi->dev); | |
287 | spin_unlock(&ubi_devices_lock); | |
288 | } | |
289 | ||
290 | /** | |
ebaaf1af | 291 | * ubi_get_by_major - get UBI device by character device major number. |
e73f4459 AB |
292 | * @major: major number |
293 | * | |
294 | * This function is similar to 'ubi_get_device()', but it searches the device | |
295 | * by its major number. | |
296 | */ | |
297 | struct ubi_device *ubi_get_by_major(int major) | |
298 | { | |
299 | int i; | |
300 | struct ubi_device *ubi; | |
301 | ||
302 | spin_lock(&ubi_devices_lock); | |
303 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
304 | ubi = ubi_devices[i]; | |
305 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
306 | ubi_assert(ubi->ref_count >= 0); | |
307 | ubi->ref_count += 1; | |
308 | get_device(&ubi->dev); | |
309 | spin_unlock(&ubi_devices_lock); | |
310 | return ubi; | |
311 | } | |
312 | } | |
313 | spin_unlock(&ubi_devices_lock); | |
314 | ||
315 | return NULL; | |
316 | } | |
317 | ||
318 | /** | |
319 | * ubi_major2num - get UBI device number by character device major number. | |
320 | * @major: major number | |
321 | * | |
322 | * This function searches UBI device number object by its major number. If UBI | |
cdfa788a | 323 | * device was not found, this function returns -ENODEV, otherwise the UBI device |
e73f4459 AB |
324 | * number is returned. |
325 | */ | |
326 | int ubi_major2num(int major) | |
327 | { | |
328 | int i, ubi_num = -ENODEV; | |
329 | ||
330 | spin_lock(&ubi_devices_lock); | |
331 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
332 | struct ubi_device *ubi = ubi_devices[i]; | |
333 | ||
334 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
335 | ubi_num = ubi->ubi_num; | |
336 | break; | |
337 | } | |
338 | } | |
339 | spin_unlock(&ubi_devices_lock); | |
340 | ||
341 | return ubi_num; | |
342 | } | |
343 | ||
801c135c AB |
344 | /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */ |
345 | static ssize_t dev_attribute_show(struct device *dev, | |
346 | struct device_attribute *attr, char *buf) | |
347 | { | |
e73f4459 AB |
348 | ssize_t ret; |
349 | struct ubi_device *ubi; | |
801c135c | 350 | |
e73f4459 AB |
351 | /* |
352 | * The below code looks weird, but it actually makes sense. We get the | |
353 | * UBI device reference from the contained 'struct ubi_device'. But it | |
354 | * is unclear if the device was removed or not yet. Indeed, if the | |
355 | * device was removed before we increased its reference count, | |
356 | * 'ubi_get_device()' will return -ENODEV and we fail. | |
357 | * | |
358 | * Remember, 'struct ubi_device' is freed in the release function, so | |
359 | * we still can use 'ubi->ubi_num'. | |
360 | */ | |
801c135c | 361 | ubi = container_of(dev, struct ubi_device, dev); |
e73f4459 AB |
362 | ubi = ubi_get_device(ubi->ubi_num); |
363 | if (!ubi) | |
364 | return -ENODEV; | |
365 | ||
801c135c | 366 | if (attr == &dev_eraseblock_size) |
e73f4459 | 367 | ret = sprintf(buf, "%d\n", ubi->leb_size); |
801c135c | 368 | else if (attr == &dev_avail_eraseblocks) |
e73f4459 | 369 | ret = sprintf(buf, "%d\n", ubi->avail_pebs); |
801c135c | 370 | else if (attr == &dev_total_eraseblocks) |
e73f4459 | 371 | ret = sprintf(buf, "%d\n", ubi->good_peb_count); |
801c135c | 372 | else if (attr == &dev_volumes_count) |
4b3cc340 | 373 | ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT); |
801c135c | 374 | else if (attr == &dev_max_ec) |
e73f4459 | 375 | ret = sprintf(buf, "%d\n", ubi->max_ec); |
801c135c | 376 | else if (attr == &dev_reserved_for_bad) |
e73f4459 | 377 | ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs); |
801c135c | 378 | else if (attr == &dev_bad_peb_count) |
e73f4459 | 379 | ret = sprintf(buf, "%d\n", ubi->bad_peb_count); |
801c135c | 380 | else if (attr == &dev_max_vol_count) |
e73f4459 | 381 | ret = sprintf(buf, "%d\n", ubi->vtbl_slots); |
801c135c | 382 | else if (attr == &dev_min_io_size) |
e73f4459 | 383 | ret = sprintf(buf, "%d\n", ubi->min_io_size); |
801c135c | 384 | else if (attr == &dev_bgt_enabled) |
e73f4459 | 385 | ret = sprintf(buf, "%d\n", ubi->thread_enabled); |
b6b76ba4 AB |
386 | else if (attr == &dev_mtd_num) |
387 | ret = sprintf(buf, "%d\n", ubi->mtd->index); | |
801c135c | 388 | else |
b6b76ba4 | 389 | ret = -EINVAL; |
801c135c | 390 | |
e73f4459 AB |
391 | ubi_put_device(ubi); |
392 | return ret; | |
801c135c AB |
393 | } |
394 | ||
53cd255c TI |
395 | static struct attribute *ubi_dev_attrs[] = { |
396 | &dev_eraseblock_size.attr, | |
397 | &dev_avail_eraseblocks.attr, | |
398 | &dev_total_eraseblocks.attr, | |
399 | &dev_volumes_count.attr, | |
400 | &dev_max_ec.attr, | |
401 | &dev_reserved_for_bad.attr, | |
402 | &dev_bad_peb_count.attr, | |
403 | &dev_max_vol_count.attr, | |
404 | &dev_min_io_size.attr, | |
405 | &dev_bgt_enabled.attr, | |
406 | &dev_mtd_num.attr, | |
407 | NULL | |
408 | }; | |
409 | ATTRIBUTE_GROUPS(ubi_dev); | |
410 | ||
36b477d0 AB |
411 | static void dev_release(struct device *dev) |
412 | { | |
413 | struct ubi_device *ubi = container_of(dev, struct ubi_device, dev); | |
414 | ||
415 | kfree(ubi); | |
416 | } | |
801c135c AB |
417 | |
418 | /** | |
419 | * ubi_sysfs_init - initialize sysfs for an UBI device. | |
420 | * @ubi: UBI device description object | |
0bf1c439 AB |
421 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
422 | * taken | |
801c135c AB |
423 | * |
424 | * This function returns zero in case of success and a negative error code in | |
425 | * case of failure. | |
426 | */ | |
0bf1c439 | 427 | static int ubi_sysfs_init(struct ubi_device *ubi, int *ref) |
801c135c AB |
428 | { |
429 | int err; | |
430 | ||
431 | ubi->dev.release = dev_release; | |
49dfc299 | 432 | ubi->dev.devt = ubi->cdev.dev; |
53cd255c TI |
433 | ubi->dev.class = &ubi_class; |
434 | ubi->dev.groups = ubi_dev_groups; | |
160bbab3 | 435 | dev_set_name(&ubi->dev, UBI_NAME_STR"%d", ubi->ubi_num); |
801c135c AB |
436 | err = device_register(&ubi->dev); |
437 | if (err) | |
db6e5770 | 438 | return err; |
801c135c | 439 | |
0bf1c439 | 440 | *ref = 1; |
53cd255c | 441 | return 0; |
801c135c AB |
442 | } |
443 | ||
444 | /** | |
445 | * ubi_sysfs_close - close sysfs for an UBI device. | |
446 | * @ubi: UBI device description object | |
447 | */ | |
448 | static void ubi_sysfs_close(struct ubi_device *ubi) | |
449 | { | |
801c135c AB |
450 | device_unregister(&ubi->dev); |
451 | } | |
452 | ||
453 | /** | |
0bf1c439 | 454 | * kill_volumes - destroy all user volumes. |
801c135c AB |
455 | * @ubi: UBI device description object |
456 | */ | |
457 | static void kill_volumes(struct ubi_device *ubi) | |
458 | { | |
459 | int i; | |
460 | ||
461 | for (i = 0; i < ubi->vtbl_slots; i++) | |
462 | if (ubi->volumes[i]) | |
89b96b69 | 463 | ubi_free_volume(ubi, ubi->volumes[i]); |
801c135c AB |
464 | } |
465 | ||
466 | /** | |
467 | * uif_init - initialize user interfaces for an UBI device. | |
468 | * @ubi: UBI device description object | |
0bf1c439 AB |
469 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
470 | * taken, otherwise set to %0 | |
471 | * | |
472 | * This function initializes various user interfaces for an UBI device. If the | |
473 | * initialization fails at an early stage, this function frees all the | |
474 | * resources it allocated, returns an error, and @ref is set to %0. However, | |
475 | * if the initialization fails after the UBI device was registered in the | |
476 | * driver core subsystem, this function takes a reference to @ubi->dev, because | |
477 | * otherwise the release function ('dev_release()') would free whole @ubi | |
478 | * object. The @ref argument is set to %1 in this case. The caller has to put | |
479 | * this reference. | |
801c135c AB |
480 | * |
481 | * This function returns zero in case of success and a negative error code in | |
0bf1c439 | 482 | * case of failure. |
801c135c | 483 | */ |
0bf1c439 | 484 | static int uif_init(struct ubi_device *ubi, int *ref) |
801c135c | 485 | { |
8c4c19f1 | 486 | int i, err; |
801c135c AB |
487 | dev_t dev; |
488 | ||
0bf1c439 | 489 | *ref = 0; |
801c135c AB |
490 | sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num); |
491 | ||
492 | /* | |
493 | * Major numbers for the UBI character devices are allocated | |
494 | * dynamically. Major numbers of volume character devices are | |
495 | * equivalent to ones of the corresponding UBI character device. Minor | |
496 | * numbers of UBI character devices are 0, while minor numbers of | |
497 | * volume character devices start from 1. Thus, we allocate one major | |
498 | * number and ubi->vtbl_slots + 1 minor numbers. | |
499 | */ | |
500 | err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name); | |
501 | if (err) { | |
32608703 | 502 | ubi_err(ubi, "cannot register UBI character devices"); |
801c135c AB |
503 | return err; |
504 | } | |
505 | ||
49dfc299 | 506 | ubi_assert(MINOR(dev) == 0); |
801c135c | 507 | cdev_init(&ubi->cdev, &ubi_cdev_operations); |
c8566350 | 508 | dbg_gen("%s major is %u", ubi->ubi_name, MAJOR(dev)); |
801c135c AB |
509 | ubi->cdev.owner = THIS_MODULE; |
510 | ||
801c135c AB |
511 | err = cdev_add(&ubi->cdev, dev, 1); |
512 | if (err) { | |
32608703 | 513 | ubi_err(ubi, "cannot add character device"); |
801c135c AB |
514 | goto out_unreg; |
515 | } | |
516 | ||
0bf1c439 | 517 | err = ubi_sysfs_init(ubi, ref); |
801c135c | 518 | if (err) |
db6e5770 | 519 | goto out_sysfs; |
801c135c AB |
520 | |
521 | for (i = 0; i < ubi->vtbl_slots; i++) | |
522 | if (ubi->volumes[i]) { | |
89b96b69 | 523 | err = ubi_add_volume(ubi, ubi->volumes[i]); |
01f7b309 | 524 | if (err) { |
32608703 | 525 | ubi_err(ubi, "cannot add volume %d", i); |
801c135c | 526 | goto out_volumes; |
01f7b309 | 527 | } |
801c135c AB |
528 | } |
529 | ||
530 | return 0; | |
531 | ||
532 | out_volumes: | |
533 | kill_volumes(ubi); | |
db6e5770 | 534 | out_sysfs: |
0bf1c439 AB |
535 | if (*ref) |
536 | get_device(&ubi->dev); | |
801c135c | 537 | ubi_sysfs_close(ubi); |
801c135c AB |
538 | cdev_del(&ubi->cdev); |
539 | out_unreg: | |
49dfc299 | 540 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
32608703 TB |
541 | ubi_err(ubi, "cannot initialize UBI %s, error %d", |
542 | ubi->ubi_name, err); | |
801c135c AB |
543 | return err; |
544 | } | |
545 | ||
546 | /** | |
547 | * uif_close - close user interfaces for an UBI device. | |
548 | * @ubi: UBI device description object | |
505d1caa AB |
549 | * |
550 | * Note, since this function un-registers UBI volume device objects (@vol->dev), | |
551 | * the memory allocated voe the volumes is freed as well (in the release | |
552 | * function). | |
801c135c AB |
553 | */ |
554 | static void uif_close(struct ubi_device *ubi) | |
555 | { | |
556 | kill_volumes(ubi); | |
557 | ubi_sysfs_close(ubi); | |
558 | cdev_del(&ubi->cdev); | |
49dfc299 | 559 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
801c135c AB |
560 | } |
561 | ||
505d1caa | 562 | /** |
47e1ec70 | 563 | * ubi_free_internal_volumes - free internal volumes. |
505d1caa AB |
564 | * @ubi: UBI device description object |
565 | */ | |
47e1ec70 | 566 | void ubi_free_internal_volumes(struct ubi_device *ubi) |
505d1caa AB |
567 | { |
568 | int i; | |
569 | ||
570 | for (i = ubi->vtbl_slots; | |
571 | i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { | |
572 | kfree(ubi->volumes[i]->eba_tbl); | |
573 | kfree(ubi->volumes[i]); | |
574 | } | |
575 | } | |
576 | ||
95e6fb02 RG |
577 | static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024) |
578 | { | |
579 | int limit, device_pebs; | |
580 | uint64_t device_size; | |
581 | ||
582 | if (!max_beb_per1024) | |
583 | return 0; | |
584 | ||
585 | /* | |
586 | * Here we are using size of the entire flash chip and | |
587 | * not just the MTD partition size because the maximum | |
588 | * number of bad eraseblocks is a percentage of the | |
589 | * whole device and bad eraseblocks are not fairly | |
590 | * distributed over the flash chip. So the worst case | |
591 | * is that all the bad eraseblocks of the chip are in | |
592 | * the MTD partition we are attaching (ubi->mtd). | |
593 | */ | |
594 | device_size = mtd_get_device_size(ubi->mtd); | |
595 | device_pebs = mtd_div_by_eb(device_size, ubi->mtd); | |
596 | limit = mult_frac(device_pebs, max_beb_per1024, 1024); | |
597 | ||
598 | /* Round it up */ | |
599 | if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs) | |
600 | limit += 1; | |
601 | ||
602 | return limit; | |
603 | } | |
604 | ||
801c135c | 605 | /** |
85c6e6e2 | 606 | * io_init - initialize I/O sub-system for a given UBI device. |
801c135c | 607 | * @ubi: UBI device description object |
256334c3 | 608 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
801c135c AB |
609 | * |
610 | * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are | |
611 | * assumed: | |
612 | * o EC header is always at offset zero - this cannot be changed; | |
613 | * o VID header starts just after the EC header at the closest address | |
cdfa788a | 614 | * aligned to @io->hdrs_min_io_size; |
801c135c | 615 | * o data starts just after the VID header at the closest address aligned to |
cdfa788a | 616 | * @io->min_io_size |
801c135c AB |
617 | * |
618 | * This function returns zero in case of success and a negative error code in | |
619 | * case of failure. | |
620 | */ | |
256334c3 | 621 | static int io_init(struct ubi_device *ubi, int max_beb_per1024) |
801c135c | 622 | { |
719bb840 AB |
623 | dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb)); |
624 | dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry)); | |
625 | ||
801c135c AB |
626 | if (ubi->mtd->numeraseregions != 0) { |
627 | /* | |
628 | * Some flashes have several erase regions. Different regions | |
629 | * may have different eraseblock size and other | |
630 | * characteristics. It looks like mostly multi-region flashes | |
631 | * have one "main" region and one or more small regions to | |
632 | * store boot loader code or boot parameters or whatever. I | |
633 | * guess we should just pick the largest region. But this is | |
634 | * not implemented. | |
635 | */ | |
32608703 | 636 | ubi_err(ubi, "multiple regions, not implemented"); |
801c135c AB |
637 | return -EINVAL; |
638 | } | |
639 | ||
dd38fccf | 640 | if (ubi->vid_hdr_offset < 0) |
cdfa788a AB |
641 | return -EINVAL; |
642 | ||
801c135c AB |
643 | /* |
644 | * Note, in this implementation we support MTD devices with 0x7FFFFFFF | |
645 | * physical eraseblocks maximum. | |
646 | */ | |
647 | ||
648 | ubi->peb_size = ubi->mtd->erasesize; | |
69423d99 | 649 | ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd); |
801c135c AB |
650 | ubi->flash_size = ubi->mtd->size; |
651 | ||
8beeb3bb | 652 | if (mtd_can_have_bb(ubi->mtd)) { |
801c135c | 653 | ubi->bad_allowed = 1; |
95e6fb02 | 654 | ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024); |
8beeb3bb | 655 | } |
801c135c | 656 | |
ebf53f42 AB |
657 | if (ubi->mtd->type == MTD_NORFLASH) { |
658 | ubi_assert(ubi->mtd->writesize == 1); | |
659 | ubi->nor_flash = 1; | |
660 | } | |
661 | ||
801c135c AB |
662 | ubi->min_io_size = ubi->mtd->writesize; |
663 | ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; | |
664 | ||
cadb40cc KP |
665 | /* |
666 | * Make sure minimal I/O unit is power of 2. Note, there is no | |
667 | * fundamental reason for this assumption. It is just an optimization | |
668 | * which allows us to avoid costly division operations. | |
669 | */ | |
7753f169 | 670 | if (!is_power_of_2(ubi->min_io_size)) { |
32608703 | 671 | ubi_err(ubi, "min. I/O unit (%d) is not power of 2", |
01f7b309 | 672 | ubi->min_io_size); |
801c135c AB |
673 | return -EINVAL; |
674 | } | |
675 | ||
676 | ubi_assert(ubi->hdrs_min_io_size > 0); | |
677 | ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size); | |
678 | ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0); | |
679 | ||
30b542ef AB |
680 | ubi->max_write_size = ubi->mtd->writebufsize; |
681 | /* | |
682 | * Maximum write size has to be greater or equivalent to min. I/O | |
683 | * size, and be multiple of min. I/O size. | |
684 | */ | |
685 | if (ubi->max_write_size < ubi->min_io_size || | |
686 | ubi->max_write_size % ubi->min_io_size || | |
687 | !is_power_of_2(ubi->max_write_size)) { | |
32608703 | 688 | ubi_err(ubi, "bad write buffer size %d for %d min. I/O unit", |
30b542ef AB |
689 | ubi->max_write_size, ubi->min_io_size); |
690 | return -EINVAL; | |
691 | } | |
692 | ||
801c135c AB |
693 | /* Calculate default aligned sizes of EC and VID headers */ |
694 | ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size); | |
695 | ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size); | |
696 | ||
719bb840 AB |
697 | dbg_gen("min_io_size %d", ubi->min_io_size); |
698 | dbg_gen("max_write_size %d", ubi->max_write_size); | |
699 | dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size); | |
700 | dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize); | |
701 | dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize); | |
801c135c AB |
702 | |
703 | if (ubi->vid_hdr_offset == 0) | |
704 | /* Default offset */ | |
705 | ubi->vid_hdr_offset = ubi->vid_hdr_aloffset = | |
706 | ubi->ec_hdr_alsize; | |
707 | else { | |
708 | ubi->vid_hdr_aloffset = ubi->vid_hdr_offset & | |
709 | ~(ubi->hdrs_min_io_size - 1); | |
710 | ubi->vid_hdr_shift = ubi->vid_hdr_offset - | |
711 | ubi->vid_hdr_aloffset; | |
712 | } | |
713 | ||
714 | /* Similar for the data offset */ | |
e8cfe009 | 715 | ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE; |
dd38fccf | 716 | ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size); |
801c135c | 717 | |
719bb840 AB |
718 | dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset); |
719 | dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset); | |
720 | dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift); | |
721 | dbg_gen("leb_start %d", ubi->leb_start); | |
801c135c AB |
722 | |
723 | /* The shift must be aligned to 32-bit boundary */ | |
724 | if (ubi->vid_hdr_shift % 4) { | |
32608703 | 725 | ubi_err(ubi, "unaligned VID header shift %d", |
801c135c AB |
726 | ubi->vid_hdr_shift); |
727 | return -EINVAL; | |
728 | } | |
729 | ||
730 | /* Check sanity */ | |
731 | if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE || | |
732 | ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE || | |
733 | ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE || | |
cadb40cc | 734 | ubi->leb_start & (ubi->min_io_size - 1)) { |
32608703 | 735 | ubi_err(ubi, "bad VID header (%d) or data offsets (%d)", |
801c135c AB |
736 | ubi->vid_hdr_offset, ubi->leb_start); |
737 | return -EINVAL; | |
738 | } | |
739 | ||
b86a2c56 AB |
740 | /* |
741 | * Set maximum amount of physical erroneous eraseblocks to be 10%. | |
742 | * Erroneous PEB are those which have read errors. | |
743 | */ | |
744 | ubi->max_erroneous = ubi->peb_count / 10; | |
745 | if (ubi->max_erroneous < 16) | |
746 | ubi->max_erroneous = 16; | |
719bb840 | 747 | dbg_gen("max_erroneous %d", ubi->max_erroneous); |
b86a2c56 | 748 | |
801c135c AB |
749 | /* |
750 | * It may happen that EC and VID headers are situated in one minimal | |
751 | * I/O unit. In this case we can only accept this UBI image in | |
752 | * read-only mode. | |
753 | */ | |
754 | if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) { | |
32608703 | 755 | ubi_warn(ubi, "EC and VID headers are in the same minimal I/O unit, switch to read-only mode"); |
801c135c AB |
756 | ubi->ro_mode = 1; |
757 | } | |
758 | ||
759 | ubi->leb_size = ubi->peb_size - ubi->leb_start; | |
760 | ||
761 | if (!(ubi->mtd->flags & MTD_WRITEABLE)) { | |
32608703 | 762 | ubi_msg(ubi, "MTD device %d is write-protected, attach in read-only mode", |
049333ce | 763 | ubi->mtd->index); |
801c135c AB |
764 | ubi->ro_mode = 1; |
765 | } | |
766 | ||
801c135c | 767 | /* |
fbd0107f | 768 | * Note, ideally, we have to initialize @ubi->bad_peb_count here. But |
801c135c AB |
769 | * unfortunately, MTD does not provide this information. We should loop |
770 | * over all physical eraseblocks and invoke mtd->block_is_bad() for | |
fbd0107f AB |
771 | * each physical eraseblock. So, we leave @ubi->bad_peb_count |
772 | * uninitialized so far. | |
801c135c AB |
773 | */ |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
4ccf8cff AB |
778 | /** |
779 | * autoresize - re-size the volume which has the "auto-resize" flag set. | |
780 | * @ubi: UBI device description object | |
781 | * @vol_id: ID of the volume to re-size | |
782 | * | |
fbd0107f | 783 | * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in |
4ccf8cff AB |
784 | * the volume table to the largest possible size. See comments in ubi-header.h |
785 | * for more description of the flag. Returns zero in case of success and a | |
786 | * negative error code in case of failure. | |
787 | */ | |
788 | static int autoresize(struct ubi_device *ubi, int vol_id) | |
789 | { | |
790 | struct ubi_volume_desc desc; | |
791 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
792 | int err, old_reserved_pebs = vol->reserved_pebs; | |
793 | ||
abb3e011 | 794 | if (ubi->ro_mode) { |
32608703 | 795 | ubi_warn(ubi, "skip auto-resize because of R/O mode"); |
abb3e011 AB |
796 | return 0; |
797 | } | |
798 | ||
4ccf8cff AB |
799 | /* |
800 | * Clear the auto-resize flag in the volume in-memory copy of the | |
505d1caa | 801 | * volume table, and 'ubi_resize_volume()' will propagate this change |
4ccf8cff AB |
802 | * to the flash. |
803 | */ | |
804 | ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG; | |
805 | ||
806 | if (ubi->avail_pebs == 0) { | |
807 | struct ubi_vtbl_record vtbl_rec; | |
808 | ||
809 | /* | |
505d1caa | 810 | * No available PEBs to re-size the volume, clear the flag on |
4ccf8cff AB |
811 | * flash and exit. |
812 | */ | |
d856c13c | 813 | vtbl_rec = ubi->vtbl[vol_id]; |
4ccf8cff AB |
814 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
815 | if (err) | |
32608703 | 816 | ubi_err(ubi, "cannot clean auto-resize flag for volume %d", |
4ccf8cff AB |
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) | |
32608703 TB |
823 | ubi_err(ubi, "cannot auto-resize volume %d", |
824 | vol_id); | |
4ccf8cff AB |
825 | } |
826 | ||
827 | if (err) | |
828 | return err; | |
829 | ||
32608703 TB |
830 | ubi_msg(ubi, "volume %d (\"%s\") re-sized from %d to %d LEBs", |
831 | vol_id, vol->name, old_reserved_pebs, vol->reserved_pebs); | |
4ccf8cff AB |
832 | return 0; |
833 | } | |
834 | ||
801c135c | 835 | /** |
cdfa788a | 836 | * ubi_attach_mtd_dev - attach an MTD device. |
ebaaf1af | 837 | * @mtd: MTD device description object |
897a316c | 838 | * @ubi_num: number to assign to the new UBI device |
801c135c | 839 | * @vid_hdr_offset: VID header offset |
edac493d | 840 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
801c135c | 841 | * |
897a316c AB |
842 | * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number |
843 | * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in | |
505d1caa | 844 | * which case this function finds a vacant device number and assigns it |
897a316c AB |
845 | * automatically. Returns the new UBI device number in case of success and a |
846 | * negative error code in case of failure. | |
cdfa788a AB |
847 | * |
848 | * Note, the invocations of this function has to be serialized by the | |
849 | * @ubi_devices_mutex. | |
801c135c | 850 | */ |
256334c3 RG |
851 | int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, |
852 | int vid_hdr_offset, int max_beb_per1024) | |
801c135c AB |
853 | { |
854 | struct ubi_device *ubi; | |
0bf1c439 | 855 | int i, err, ref = 0; |
801c135c | 856 | |
d2f588f9 RG |
857 | if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT) |
858 | return -EINVAL; | |
859 | ||
860 | if (!max_beb_per1024) | |
861 | max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT; | |
862 | ||
cdfa788a AB |
863 | /* |
864 | * Check if we already have the same MTD device attached. | |
865 | * | |
866 | * Note, this function assumes that UBI devices creations and deletions | |
867 | * are serialized, so it does not take the &ubi_devices_lock. | |
868 | */ | |
897a316c | 869 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
b96bf4c3 | 870 | ubi = ubi_devices[i]; |
cdfa788a | 871 | if (ubi && mtd->index == ubi->mtd->index) { |
32608703 | 872 | ubi_err(ubi, "mtd%d is already attached to ubi%d", |
801c135c | 873 | mtd->index, i); |
897a316c | 874 | return -EEXIST; |
801c135c | 875 | } |
897a316c | 876 | } |
801c135c | 877 | |
897a316c AB |
878 | /* |
879 | * Make sure this MTD device is not emulated on top of an UBI volume | |
880 | * already. Well, generally this recursion works fine, but there are | |
881 | * different problems like the UBI module takes a reference to itself | |
882 | * by attaching (and thus, opening) the emulated MTD device. This | |
883 | * results in inability to unload the module. And in general it makes | |
884 | * no sense to attach emulated MTD devices, so we prohibit this. | |
885 | */ | |
886 | if (mtd->type == MTD_UBIVOLUME) { | |
32608703 | 887 | ubi_err(ubi, "refuse attaching mtd%d - it is already emulated on top of UBI", |
049333ce | 888 | mtd->index); |
897a316c AB |
889 | return -EINVAL; |
890 | } | |
891 | ||
892 | if (ubi_num == UBI_DEV_NUM_AUTO) { | |
893 | /* Search for an empty slot in the @ubi_devices array */ | |
894 | for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) | |
895 | if (!ubi_devices[ubi_num]) | |
896 | break; | |
897 | if (ubi_num == UBI_MAX_DEVICES) { | |
32608703 | 898 | ubi_err(ubi, "only %d UBI devices may be created", |
9c9ec147 | 899 | UBI_MAX_DEVICES); |
897a316c AB |
900 | return -ENFILE; |
901 | } | |
902 | } else { | |
903 | if (ubi_num >= UBI_MAX_DEVICES) | |
904 | return -EINVAL; | |
b96bf4c3 | 905 | |
897a316c AB |
906 | /* Make sure ubi_num is not busy */ |
907 | if (ubi_devices[ubi_num]) { | |
45fc5c81 | 908 | ubi_err(ubi, "already exists"); |
897a316c AB |
909 | return -EEXIST; |
910 | } | |
b96bf4c3 AB |
911 | } |
912 | ||
cdfa788a AB |
913 | ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL); |
914 | if (!ubi) | |
915 | return -ENOMEM; | |
801c135c | 916 | |
cdfa788a | 917 | ubi->mtd = mtd; |
897a316c | 918 | ubi->ubi_num = ubi_num; |
801c135c | 919 | ubi->vid_hdr_offset = vid_hdr_offset; |
4ccf8cff AB |
920 | ubi->autoresize_vol_id = -1; |
921 | ||
77e6c2f0 RW |
922 | #ifdef CONFIG_MTD_UBI_FASTMAP |
923 | ubi->fm_pool.used = ubi->fm_pool.size = 0; | |
924 | ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0; | |
925 | ||
926 | /* | |
927 | * fm_pool.max_size is 5% of the total number of PEBs but it's also | |
928 | * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE. | |
929 | */ | |
930 | ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size, | |
931 | ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE); | |
212240df | 932 | ubi->fm_pool.max_size = max(ubi->fm_pool.max_size, |
933 | UBI_FM_MIN_POOL_SIZE); | |
77e6c2f0 | 934 | |
68e3226b | 935 | ubi->fm_wl_pool.max_size = ubi->fm_pool.max_size / 2; |
77e6c2f0 | 936 | ubi->fm_disabled = !fm_autoconvert; |
479c2c0c RW |
937 | if (fm_debug) |
938 | ubi_enable_dbg_chk_fastmap(ubi); | |
77e6c2f0 RW |
939 | |
940 | if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) | |
941 | <= UBI_FM_MAX_START) { | |
32608703 | 942 | ubi_err(ubi, "More than %i PEBs are needed for fastmap, sorry.", |
77e6c2f0 RW |
943 | UBI_FM_MAX_START); |
944 | ubi->fm_disabled = 1; | |
945 | } | |
946 | ||
32608703 TB |
947 | ubi_msg(ubi, "default fastmap pool size: %d", ubi->fm_pool.max_size); |
948 | ubi_msg(ubi, "default fastmap WL pool size: %d", | |
949 | ubi->fm_wl_pool.max_size); | |
77e6c2f0 RW |
950 | #else |
951 | ubi->fm_disabled = 1; | |
952 | #endif | |
4ccf8cff AB |
953 | mutex_init(&ubi->buf_mutex); |
954 | mutex_init(&ubi->ckvol_mutex); | |
f089c0b2 | 955 | mutex_init(&ubi->device_mutex); |
4ccf8cff | 956 | spin_lock_init(&ubi->volumes_lock); |
111ab0b2 RW |
957 | init_rwsem(&ubi->fm_protect); |
958 | init_rwsem(&ubi->fm_eba_sem); | |
cdfa788a | 959 | |
45fc5c81 | 960 | ubi_msg(ubi, "attaching mtd%d", mtd->index); |
cdfa788a | 961 | |
256334c3 | 962 | err = io_init(ubi, max_beb_per1024); |
801c135c AB |
963 | if (err) |
964 | goto out_free; | |
965 | ||
ad5942ba | 966 | err = -ENOMEM; |
0ca39d74 AB |
967 | ubi->peb_buf = vmalloc(ubi->peb_size); |
968 | if (!ubi->peb_buf) | |
e88d6e10 AB |
969 | goto out_free; |
970 | ||
77e6c2f0 RW |
971 | #ifdef CONFIG_MTD_UBI_FASTMAP |
972 | ubi->fm_size = ubi_calc_fm_size(ubi); | |
973 | ubi->fm_buf = vzalloc(ubi->fm_size); | |
974 | if (!ubi->fm_buf) | |
975 | goto out_free; | |
976 | #endif | |
dac6e208 | 977 | err = ubi_attach(ubi, 0); |
801c135c | 978 | if (err) { |
32608703 TB |
979 | ubi_err(ubi, "failed to attach mtd%d, error %d", |
980 | mtd->index, err); | |
eab73772 | 981 | goto out_free; |
801c135c AB |
982 | } |
983 | ||
4ccf8cff AB |
984 | if (ubi->autoresize_vol_id != -1) { |
985 | err = autoresize(ubi, ubi->autoresize_vol_id); | |
986 | if (err) | |
987 | goto out_detach; | |
988 | } | |
989 | ||
0bf1c439 | 990 | err = uif_init(ubi, &ref); |
801c135c | 991 | if (err) |
0bf1c439 | 992 | goto out_detach; |
801c135c | 993 | |
2a734bb8 AB |
994 | err = ubi_debugfs_init_dev(ubi); |
995 | if (err) | |
996 | goto out_uif; | |
997 | ||
f170168b | 998 | ubi->bgt_thread = kthread_create(ubi_thread, ubi, "%s", ubi->bgt_name); |
cdfa788a AB |
999 | if (IS_ERR(ubi->bgt_thread)) { |
1000 | err = PTR_ERR(ubi->bgt_thread); | |
32608703 TB |
1001 | ubi_err(ubi, "cannot spawn \"%s\", error %d", |
1002 | ubi->bgt_name, err); | |
2a734bb8 | 1003 | goto out_debugfs; |
cdfa788a AB |
1004 | } |
1005 | ||
32608703 TB |
1006 | ubi_msg(ubi, "attached mtd%d (name \"%s\", size %llu MiB)", |
1007 | mtd->index, mtd->name, ubi->flash_size >> 20); | |
1008 | ubi_msg(ubi, "PEB size: %d bytes (%d KiB), LEB size: %d bytes", | |
719bb840 | 1009 | ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size); |
32608703 | 1010 | ubi_msg(ubi, "min./max. I/O unit sizes: %d/%d, sub-page size %d", |
719bb840 | 1011 | ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size); |
32608703 | 1012 | ubi_msg(ubi, "VID header offset: %d (aligned %d), data offset: %d", |
719bb840 | 1013 | ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start); |
32608703 | 1014 | ubi_msg(ubi, "good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d", |
719bb840 | 1015 | ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count); |
32608703 | 1016 | ubi_msg(ubi, "user volume: %d, internal volumes: %d, max. volumes count: %d", |
719bb840 AB |
1017 | ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT, |
1018 | ubi->vtbl_slots); | |
32608703 | 1019 | ubi_msg(ubi, "max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u", |
719bb840 AB |
1020 | ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD, |
1021 | ubi->image_seq); | |
32608703 | 1022 | ubi_msg(ubi, "available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d", |
719bb840 | 1023 | ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs); |
801c135c | 1024 | |
ddbd3b61 AB |
1025 | /* |
1026 | * The below lock makes sure we do not race with 'ubi_thread()' which | |
1027 | * checks @ubi->thread_enabled. Otherwise we may fail to wake it up. | |
1028 | */ | |
1029 | spin_lock(&ubi->wl_lock); | |
28237e45 | 1030 | ubi->thread_enabled = 1; |
d37e6bf6 | 1031 | wake_up_process(ubi->bgt_thread); |
ddbd3b61 | 1032 | spin_unlock(&ubi->wl_lock); |
801c135c | 1033 | |
897a316c | 1034 | ubi_devices[ubi_num] = ubi; |
0e0ee1cc | 1035 | ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL); |
897a316c | 1036 | return ubi_num; |
801c135c | 1037 | |
2a734bb8 AB |
1038 | out_debugfs: |
1039 | ubi_debugfs_exit_dev(ubi); | |
cdfa788a | 1040 | out_uif: |
01a4110d AB |
1041 | get_device(&ubi->dev); |
1042 | ubi_assert(ref); | |
cdfa788a | 1043 | uif_close(ubi); |
801c135c | 1044 | out_detach: |
801c135c | 1045 | ubi_wl_close(ubi); |
47e1ec70 | 1046 | ubi_free_internal_volumes(ubi); |
d7f0c4dc | 1047 | vfree(ubi->vtbl); |
801c135c | 1048 | out_free: |
0ca39d74 | 1049 | vfree(ubi->peb_buf); |
77e6c2f0 | 1050 | vfree(ubi->fm_buf); |
0bf1c439 AB |
1051 | if (ref) |
1052 | put_device(&ubi->dev); | |
1053 | else | |
1054 | kfree(ubi); | |
801c135c AB |
1055 | return err; |
1056 | } | |
1057 | ||
1058 | /** | |
cdfa788a AB |
1059 | * ubi_detach_mtd_dev - detach an MTD device. |
1060 | * @ubi_num: UBI device number to detach from | |
1061 | * @anyway: detach MTD even if device reference count is not zero | |
1062 | * | |
1063 | * This function destroys an UBI device number @ubi_num and detaches the | |
1064 | * underlying MTD device. Returns zero in case of success and %-EBUSY if the | |
1065 | * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not | |
1066 | * exist. | |
1067 | * | |
1068 | * Note, the invocations of this function has to be serialized by the | |
1069 | * @ubi_devices_mutex. | |
801c135c | 1070 | */ |
cdfa788a | 1071 | int ubi_detach_mtd_dev(int ubi_num, int anyway) |
801c135c | 1072 | { |
cdfa788a AB |
1073 | struct ubi_device *ubi; |
1074 | ||
1075 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
1076 | return -EINVAL; | |
1077 | ||
0e0ee1cc DP |
1078 | ubi = ubi_get_device(ubi_num); |
1079 | if (!ubi) | |
cdfa788a | 1080 | return -EINVAL; |
cdfa788a | 1081 | |
0e0ee1cc DP |
1082 | spin_lock(&ubi_devices_lock); |
1083 | put_device(&ubi->dev); | |
1084 | ubi->ref_count -= 1; | |
cdfa788a AB |
1085 | if (ubi->ref_count) { |
1086 | if (!anyway) { | |
897a316c | 1087 | spin_unlock(&ubi_devices_lock); |
cdfa788a AB |
1088 | return -EBUSY; |
1089 | } | |
1090 | /* This may only happen if there is a bug */ | |
32608703 | 1091 | ubi_err(ubi, "%s reference count %d, destroy anyway", |
cdfa788a AB |
1092 | ubi->ubi_name, ubi->ref_count); |
1093 | } | |
897a316c | 1094 | ubi_devices[ubi_num] = NULL; |
cdfa788a AB |
1095 | spin_unlock(&ubi_devices_lock); |
1096 | ||
897a316c | 1097 | ubi_assert(ubi_num == ubi->ubi_num); |
0e0ee1cc | 1098 | ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL); |
32608703 | 1099 | ubi_msg(ubi, "detaching mtd%d", ubi->mtd->index); |
77e6c2f0 RW |
1100 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1101 | /* If we don't write a new fastmap at detach time we lose all | |
24b7a347 RW |
1102 | * EC updates that have been made since the last written fastmap. |
1103 | * In case of fastmap debugging we omit the update to simulate an | |
1104 | * unclean shutdown. */ | |
1105 | if (!ubi_dbg_chk_fastmap(ubi)) | |
1106 | ubi_update_fastmap(ubi); | |
77e6c2f0 | 1107 | #endif |
cdfa788a AB |
1108 | /* |
1109 | * Before freeing anything, we have to stop the background thread to | |
1110 | * prevent it from doing anything on this device while we are freeing. | |
1111 | */ | |
1112 | if (ubi->bgt_thread) | |
1113 | kthread_stop(ubi->bgt_thread); | |
801c135c | 1114 | |
36b477d0 AB |
1115 | /* |
1116 | * Get a reference to the device in order to prevent 'dev_release()' | |
0bf1c439 | 1117 | * from freeing the @ubi object. |
36b477d0 AB |
1118 | */ |
1119 | get_device(&ubi->dev); | |
1120 | ||
2a734bb8 | 1121 | ubi_debugfs_exit_dev(ubi); |
801c135c | 1122 | uif_close(ubi); |
77e6c2f0 | 1123 | |
801c135c | 1124 | ubi_wl_close(ubi); |
47e1ec70 | 1125 | ubi_free_internal_volumes(ubi); |
92ad8f37 | 1126 | vfree(ubi->vtbl); |
801c135c | 1127 | put_mtd_device(ubi->mtd); |
0ca39d74 | 1128 | vfree(ubi->peb_buf); |
77e6c2f0 | 1129 | vfree(ubi->fm_buf); |
32608703 | 1130 | ubi_msg(ubi, "mtd%d is detached", ubi->mtd->index); |
36b477d0 | 1131 | put_device(&ubi->dev); |
cdfa788a | 1132 | return 0; |
801c135c AB |
1133 | } |
1134 | ||
cdfa788a | 1135 | /** |
f9b0080e AB |
1136 | * open_mtd_by_chdev - open an MTD device by its character device node path. |
1137 | * @mtd_dev: MTD character device node path | |
1138 | * | |
1139 | * This helper function opens an MTD device by its character node device path. | |
1140 | * Returns MTD device description object in case of success and a negative | |
1141 | * error code in case of failure. | |
1142 | */ | |
1143 | static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev) | |
1144 | { | |
1145 | int err, major, minor, mode; | |
1146 | struct path path; | |
1147 | ||
1148 | /* Probably this is an MTD character device node path */ | |
1149 | err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path); | |
1150 | if (err) | |
1151 | return ERR_PTR(err); | |
1152 | ||
1153 | /* MTD device number is defined by the major / minor numbers */ | |
bb668734 DH |
1154 | major = imajor(d_backing_inode(path.dentry)); |
1155 | minor = iminor(d_backing_inode(path.dentry)); | |
1156 | mode = d_backing_inode(path.dentry)->i_mode; | |
f9b0080e AB |
1157 | path_put(&path); |
1158 | if (major != MTD_CHAR_MAJOR || !S_ISCHR(mode)) | |
1159 | return ERR_PTR(-EINVAL); | |
1160 | ||
1161 | if (minor & 1) | |
1162 | /* | |
1163 | * Just do not think the "/dev/mtdrX" devices support is need, | |
1164 | * so do not support them to avoid doing extra work. | |
1165 | */ | |
1166 | return ERR_PTR(-EINVAL); | |
1167 | ||
1168 | return get_mtd_device(NULL, minor / 2); | |
1169 | } | |
1170 | ||
1171 | /** | |
1172 | * open_mtd_device - open MTD device by name, character device path, or number. | |
1173 | * @mtd_dev: name, character device node path, or MTD device device number | |
cdfa788a | 1174 | * |
d1f3dd6c | 1175 | * This function tries to open and MTD device described by @mtd_dev string, |
f9b0080e AB |
1176 | * which is first treated as ASCII MTD device number, and if it is not true, it |
1177 | * is treated as MTD device name, and if that is also not true, it is treated | |
1178 | * as MTD character device node path. Returns MTD device description object in | |
1179 | * case of success and a negative error code in case of failure. | |
cdfa788a AB |
1180 | */ |
1181 | static struct mtd_info * __init open_mtd_device(const char *mtd_dev) | |
1182 | { | |
1183 | struct mtd_info *mtd; | |
d1f3dd6c AB |
1184 | int mtd_num; |
1185 | char *endp; | |
cdfa788a | 1186 | |
d1f3dd6c AB |
1187 | mtd_num = simple_strtoul(mtd_dev, &endp, 0); |
1188 | if (*endp != '\0' || mtd_dev == endp) { | |
cdfa788a | 1189 | /* |
d1f3dd6c AB |
1190 | * This does not look like an ASCII integer, probably this is |
1191 | * MTD device name. | |
cdfa788a | 1192 | */ |
d1f3dd6c | 1193 | mtd = get_mtd_device_nm(mtd_dev); |
f9b0080e AB |
1194 | if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV) |
1195 | /* Probably this is an MTD character device node path */ | |
1196 | mtd = open_mtd_by_chdev(mtd_dev); | |
d1f3dd6c | 1197 | } else |
cdfa788a | 1198 | mtd = get_mtd_device(NULL, mtd_num); |
cdfa788a AB |
1199 | |
1200 | return mtd; | |
1201 | } | |
1202 | ||
801c135c AB |
1203 | static int __init ubi_init(void) |
1204 | { | |
1205 | int err, i, k; | |
1206 | ||
1207 | /* Ensure that EC and VID headers have correct size */ | |
1208 | BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64); | |
1209 | BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64); | |
1210 | ||
1211 | if (mtd_devs > UBI_MAX_DEVICES) { | |
32608703 TB |
1212 | pr_err("UBI error: too many MTD devices, maximum is %d", |
1213 | UBI_MAX_DEVICES); | |
801c135c AB |
1214 | return -EINVAL; |
1215 | } | |
1216 | ||
9f961b57 | 1217 | /* Create base sysfs directory and sysfs files */ |
53cd255c TI |
1218 | err = class_register(&ubi_class); |
1219 | if (err < 0) | |
1220 | return err; | |
9f961b57 AB |
1221 | |
1222 | err = misc_register(&ubi_ctrl_cdev); | |
1223 | if (err) { | |
32608703 | 1224 | pr_err("UBI error: cannot register device"); |
53cd255c | 1225 | goto out; |
9f961b57 | 1226 | } |
801c135c | 1227 | |
06b68ba1 | 1228 | ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab", |
c4506092 AB |
1229 | sizeof(struct ubi_wl_entry), |
1230 | 0, 0, NULL); | |
4d525145 JL |
1231 | if (!ubi_wl_entry_slab) { |
1232 | err = -ENOMEM; | |
b9a06623 | 1233 | goto out_dev_unreg; |
4d525145 | 1234 | } |
06b68ba1 | 1235 | |
2a734bb8 AB |
1236 | err = ubi_debugfs_init(); |
1237 | if (err) | |
1238 | goto out_slab; | |
1239 | ||
1240 | ||
801c135c AB |
1241 | /* Attach MTD devices */ |
1242 | for (i = 0; i < mtd_devs; i++) { | |
1243 | struct mtd_dev_param *p = &mtd_dev_param[i]; | |
cdfa788a | 1244 | struct mtd_info *mtd; |
801c135c AB |
1245 | |
1246 | cond_resched(); | |
cdfa788a AB |
1247 | |
1248 | mtd = open_mtd_device(p->name); | |
1249 | if (IS_ERR(mtd)) { | |
1250 | err = PTR_ERR(mtd); | |
32608703 TB |
1251 | pr_err("UBI error: cannot open mtd %s, error %d", |
1252 | p->name, err); | |
1557b9e1 MF |
1253 | /* See comment below re-ubi_is_module(). */ |
1254 | if (ubi_is_module()) | |
1255 | goto out_detach; | |
1256 | continue; | |
cdfa788a AB |
1257 | } |
1258 | ||
1259 | mutex_lock(&ubi_devices_mutex); | |
83ff59a0 | 1260 | err = ubi_attach_mtd_dev(mtd, p->ubi_num, |
edac493d | 1261 | p->vid_hdr_offs, p->max_beb_per1024); |
cdfa788a AB |
1262 | mutex_unlock(&ubi_devices_mutex); |
1263 | if (err < 0) { | |
32608703 TB |
1264 | pr_err("UBI error: cannot attach mtd%d", |
1265 | mtd->index); | |
af7ad7a0 MKB |
1266 | put_mtd_device(mtd); |
1267 | ||
1268 | /* | |
1269 | * Originally UBI stopped initializing on any error. | |
1270 | * However, later on it was found out that this | |
1271 | * behavior is not very good when UBI is compiled into | |
1272 | * the kernel and the MTD devices to attach are passed | |
1273 | * through the command line. Indeed, UBI failure | |
1274 | * stopped whole boot sequence. | |
1275 | * | |
1276 | * To fix this, we changed the behavior for the | |
1277 | * non-module case, but preserved the old behavior for | |
1278 | * the module case, just for compatibility. This is a | |
1279 | * little inconsistent, though. | |
1280 | */ | |
1281 | if (ubi_is_module()) | |
1282 | goto out_detach; | |
9f961b57 | 1283 | } |
801c135c AB |
1284 | } |
1285 | ||
9d54c8a3 EG |
1286 | err = ubiblock_init(); |
1287 | if (err) { | |
32608703 | 1288 | pr_err("UBI error: block: cannot initialize, error %d", err); |
9d54c8a3 EG |
1289 | |
1290 | /* See comment above re-ubi_is_module(). */ | |
1291 | if (ubi_is_module()) | |
1292 | goto out_detach; | |
1293 | } | |
1294 | ||
801c135c AB |
1295 | return 0; |
1296 | ||
1297 | out_detach: | |
1298 | for (k = 0; k < i; k++) | |
cdfa788a AB |
1299 | if (ubi_devices[k]) { |
1300 | mutex_lock(&ubi_devices_mutex); | |
1301 | ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1); | |
1302 | mutex_unlock(&ubi_devices_mutex); | |
1303 | } | |
2a734bb8 AB |
1304 | ubi_debugfs_exit(); |
1305 | out_slab: | |
06b68ba1 | 1306 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 AB |
1307 | out_dev_unreg: |
1308 | misc_deregister(&ubi_ctrl_cdev); | |
9f961b57 | 1309 | out: |
53cd255c | 1310 | class_unregister(&ubi_class); |
32608703 | 1311 | pr_err("UBI error: cannot initialize UBI, error %d", err); |
801c135c AB |
1312 | return err; |
1313 | } | |
cf38aca5 | 1314 | late_initcall(ubi_init); |
801c135c AB |
1315 | |
1316 | static void __exit ubi_exit(void) | |
1317 | { | |
b96bf4c3 | 1318 | int i; |
801c135c | 1319 | |
9d54c8a3 EG |
1320 | ubiblock_exit(); |
1321 | ||
b96bf4c3 | 1322 | for (i = 0; i < UBI_MAX_DEVICES; i++) |
cdfa788a AB |
1323 | if (ubi_devices[i]) { |
1324 | mutex_lock(&ubi_devices_mutex); | |
1325 | ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1); | |
1326 | mutex_unlock(&ubi_devices_mutex); | |
1327 | } | |
2a734bb8 | 1328 | ubi_debugfs_exit(); |
06b68ba1 | 1329 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 | 1330 | misc_deregister(&ubi_ctrl_cdev); |
53cd255c | 1331 | class_unregister(&ubi_class); |
801c135c AB |
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) { |
32608703 | 1349 | pr_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: | |
32608703 | 1365 | pr_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]; | |
83ff59a0 | 1386 | char *tokens[MTD_PARAM_MAX_COUNT], *token; |
801c135c | 1387 | |
77c722dd AB |
1388 | if (!val) |
1389 | return -EINVAL; | |
1390 | ||
801c135c | 1391 | if (mtd_devs == UBI_MAX_DEVICES) { |
32608703 TB |
1392 | pr_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) { | |
32608703 TB |
1399 | pr_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) { | |
45fc5c81 | 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) { | |
32608703 | 1419 | pr_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 | ||
83ff59a0 MF |
1426 | token = tokens[1]; |
1427 | if (token) { | |
1428 | p->vid_hdr_offs = bytes_str_to_int(token); | |
801c135c | 1429 | |
83ff59a0 MF |
1430 | if (p->vid_hdr_offs < 0) |
1431 | return p->vid_hdr_offs; | |
1432 | } | |
801c135c | 1433 | |
83ff59a0 MF |
1434 | token = tokens[2]; |
1435 | if (token) { | |
1436 | int err = kstrtoint(token, 10, &p->max_beb_per1024); | |
edac493d RG |
1437 | |
1438 | if (err) { | |
32608703 TB |
1439 | pr_err("UBI error: bad value for max_beb_per1024 parameter: %s", |
1440 | token); | |
edac493d RG |
1441 | return -EINVAL; |
1442 | } | |
1443 | } | |
1444 | ||
83ff59a0 MF |
1445 | token = tokens[3]; |
1446 | if (token) { | |
1447 | int err = kstrtoint(token, 10, &p->ubi_num); | |
1448 | ||
1449 | if (err) { | |
32608703 TB |
1450 | pr_err("UBI error: bad value for ubi_num parameter: %s", |
1451 | token); | |
83ff59a0 MF |
1452 | return -EINVAL; |
1453 | } | |
1454 | } else | |
1455 | p->ubi_num = UBI_DEV_NUM_AUTO; | |
1456 | ||
801c135c AB |
1457 | mtd_devs += 1; |
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000); | |
83ff59a0 | 1462 | MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024[,ubi_num]]].\n" |
801c135c | 1463 | "Multiple \"mtd\" parameters may be specified.\n" |
edac493d RG |
1464 | "MTD devices may be specified by their number, name, or path to the MTD character device node.\n" |
1465 | "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n" | |
1466 | "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value (" | |
1467 | __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n" | |
83ff59a0 | 1468 | "Optional \"ubi_num\" parameter specifies UBI device number which have to be assigned to the newly created UBI device (assigned automatically by default)\n" |
edac493d RG |
1469 | "\n" |
1470 | "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n" | |
1471 | "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" | |
1472 | "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" | |
83ff59a0 | 1473 | "Example 4: mtd=/dev/mtd1,0,0,5 - attach MTD device /dev/mtd1 to UBI 5 and using default values for the other fields.\n" |
edac493d | 1474 | "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device)."); |
77e6c2f0 RW |
1475 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1476 | module_param(fm_autoconvert, bool, 0644); | |
1477 | MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap."); | |
479c2c0c RW |
1478 | module_param(fm_debug, bool, 0); |
1479 | MODULE_PARM_DESC(fm_debug, "Set this parameter to enable fastmap debugging by default. Warning, this will make fastmap slow!"); | |
77e6c2f0 | 1480 | #endif |
801c135c AB |
1481 | MODULE_VERSION(__stringify(UBI_VERSION)); |
1482 | MODULE_DESCRIPTION("UBI - Unsorted Block Images"); | |
1483 | MODULE_AUTHOR("Artem Bityutskiy"); | |
1484 | MODULE_LICENSE("GPL"); |