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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); | |
525bab71 EG |
152 | static struct device_attribute dev_ro_mode = |
153 | __ATTR(ro_mode, S_IRUGO, dev_attribute_show, NULL); | |
801c135c | 154 | |
0e0ee1cc DP |
155 | /** |
156 | * ubi_volume_notify - send a volume change notification. | |
157 | * @ubi: UBI device description object | |
158 | * @vol: volume description object of the changed volume | |
159 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
160 | * | |
161 | * This is a helper function which notifies all subscribers about a volume | |
162 | * change event (creation, removal, re-sizing, re-naming, updating). Returns | |
163 | * zero in case of success and a negative error code in case of failure. | |
164 | */ | |
165 | int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype) | |
166 | { | |
84b678f4 | 167 | int ret; |
0e0ee1cc DP |
168 | struct ubi_notification nt; |
169 | ||
170 | ubi_do_get_device_info(ubi, &nt.di); | |
171 | ubi_do_get_volume_info(ubi, vol, &nt.vi); | |
77e6c2f0 | 172 | |
77e6c2f0 RW |
173 | switch (ntype) { |
174 | case UBI_VOLUME_ADDED: | |
175 | case UBI_VOLUME_REMOVED: | |
176 | case UBI_VOLUME_RESIZED: | |
177 | case UBI_VOLUME_RENAMED: | |
84b678f4 RW |
178 | ret = ubi_update_fastmap(ubi); |
179 | if (ret) | |
180 | ubi_msg(ubi, "Unable to write a new fastmap: %i", ret); | |
77e6c2f0 | 181 | } |
84b678f4 | 182 | |
0e0ee1cc DP |
183 | return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt); |
184 | } | |
185 | ||
186 | /** | |
187 | * ubi_notify_all - send a notification to all volumes. | |
188 | * @ubi: UBI device description object | |
189 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
190 | * @nb: the notifier to call | |
191 | * | |
192 | * This function walks all volumes of UBI device @ubi and sends the @ntype | |
193 | * notification for each volume. If @nb is %NULL, then all registered notifiers | |
194 | * are called, otherwise only the @nb notifier is called. Returns the number of | |
195 | * sent notifications. | |
196 | */ | |
197 | int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb) | |
198 | { | |
199 | struct ubi_notification nt; | |
200 | int i, count = 0; | |
201 | ||
202 | ubi_do_get_device_info(ubi, &nt.di); | |
203 | ||
204 | mutex_lock(&ubi->device_mutex); | |
205 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
206 | /* | |
207 | * Since the @ubi->device is locked, and we are not going to | |
208 | * change @ubi->volumes, we do not have to lock | |
209 | * @ubi->volumes_lock. | |
210 | */ | |
211 | if (!ubi->volumes[i]) | |
212 | continue; | |
213 | ||
214 | ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi); | |
215 | if (nb) | |
216 | nb->notifier_call(nb, ntype, &nt); | |
217 | else | |
218 | blocking_notifier_call_chain(&ubi_notifiers, ntype, | |
219 | &nt); | |
220 | count += 1; | |
221 | } | |
222 | mutex_unlock(&ubi->device_mutex); | |
223 | ||
224 | return count; | |
225 | } | |
226 | ||
227 | /** | |
228 | * ubi_enumerate_volumes - send "add" notification for all existing volumes. | |
229 | * @nb: the notifier to call | |
230 | * | |
231 | * This function walks all UBI devices and volumes and sends the | |
232 | * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all | |
233 | * registered notifiers are called, otherwise only the @nb notifier is called. | |
234 | * Returns the number of sent notifications. | |
235 | */ | |
236 | int ubi_enumerate_volumes(struct notifier_block *nb) | |
237 | { | |
238 | int i, count = 0; | |
239 | ||
240 | /* | |
241 | * Since the @ubi_devices_mutex is locked, and we are not going to | |
242 | * change @ubi_devices, we do not have to lock @ubi_devices_lock. | |
243 | */ | |
244 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
245 | struct ubi_device *ubi = ubi_devices[i]; | |
246 | ||
247 | if (!ubi) | |
248 | continue; | |
249 | count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb); | |
250 | } | |
251 | ||
252 | return count; | |
253 | } | |
254 | ||
e73f4459 AB |
255 | /** |
256 | * ubi_get_device - get UBI device. | |
257 | * @ubi_num: UBI device number | |
258 | * | |
259 | * This function returns UBI device description object for UBI device number | |
260 | * @ubi_num, or %NULL if the device does not exist. This function increases the | |
261 | * device reference count to prevent removal of the device. In other words, the | |
262 | * device cannot be removed if its reference count is not zero. | |
263 | */ | |
264 | struct ubi_device *ubi_get_device(int ubi_num) | |
265 | { | |
266 | struct ubi_device *ubi; | |
267 | ||
268 | spin_lock(&ubi_devices_lock); | |
269 | ubi = ubi_devices[ubi_num]; | |
270 | if (ubi) { | |
271 | ubi_assert(ubi->ref_count >= 0); | |
272 | ubi->ref_count += 1; | |
273 | get_device(&ubi->dev); | |
274 | } | |
275 | spin_unlock(&ubi_devices_lock); | |
276 | ||
277 | return ubi; | |
278 | } | |
279 | ||
280 | /** | |
281 | * ubi_put_device - drop an UBI device reference. | |
282 | * @ubi: UBI device description object | |
283 | */ | |
284 | void ubi_put_device(struct ubi_device *ubi) | |
285 | { | |
286 | spin_lock(&ubi_devices_lock); | |
287 | ubi->ref_count -= 1; | |
288 | put_device(&ubi->dev); | |
289 | spin_unlock(&ubi_devices_lock); | |
290 | } | |
291 | ||
292 | /** | |
ebaaf1af | 293 | * ubi_get_by_major - get UBI device by character device major number. |
e73f4459 AB |
294 | * @major: major number |
295 | * | |
296 | * This function is similar to 'ubi_get_device()', but it searches the device | |
297 | * by its major number. | |
298 | */ | |
299 | struct ubi_device *ubi_get_by_major(int major) | |
300 | { | |
301 | int i; | |
302 | struct ubi_device *ubi; | |
303 | ||
304 | spin_lock(&ubi_devices_lock); | |
305 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
306 | ubi = ubi_devices[i]; | |
307 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
308 | ubi_assert(ubi->ref_count >= 0); | |
309 | ubi->ref_count += 1; | |
310 | get_device(&ubi->dev); | |
311 | spin_unlock(&ubi_devices_lock); | |
312 | return ubi; | |
313 | } | |
314 | } | |
315 | spin_unlock(&ubi_devices_lock); | |
316 | ||
317 | return NULL; | |
318 | } | |
319 | ||
320 | /** | |
321 | * ubi_major2num - get UBI device number by character device major number. | |
322 | * @major: major number | |
323 | * | |
324 | * This function searches UBI device number object by its major number. If UBI | |
cdfa788a | 325 | * device was not found, this function returns -ENODEV, otherwise the UBI device |
e73f4459 AB |
326 | * number is returned. |
327 | */ | |
328 | int ubi_major2num(int major) | |
329 | { | |
330 | int i, ubi_num = -ENODEV; | |
331 | ||
332 | spin_lock(&ubi_devices_lock); | |
333 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
334 | struct ubi_device *ubi = ubi_devices[i]; | |
335 | ||
336 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
337 | ubi_num = ubi->ubi_num; | |
338 | break; | |
339 | } | |
340 | } | |
341 | spin_unlock(&ubi_devices_lock); | |
342 | ||
343 | return ubi_num; | |
344 | } | |
345 | ||
801c135c AB |
346 | /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */ |
347 | static ssize_t dev_attribute_show(struct device *dev, | |
348 | struct device_attribute *attr, char *buf) | |
349 | { | |
e73f4459 AB |
350 | ssize_t ret; |
351 | struct ubi_device *ubi; | |
801c135c | 352 | |
e73f4459 AB |
353 | /* |
354 | * The below code looks weird, but it actually makes sense. We get the | |
355 | * UBI device reference from the contained 'struct ubi_device'. But it | |
356 | * is unclear if the device was removed or not yet. Indeed, if the | |
357 | * device was removed before we increased its reference count, | |
358 | * 'ubi_get_device()' will return -ENODEV and we fail. | |
359 | * | |
360 | * Remember, 'struct ubi_device' is freed in the release function, so | |
361 | * we still can use 'ubi->ubi_num'. | |
362 | */ | |
801c135c | 363 | ubi = container_of(dev, struct ubi_device, dev); |
e73f4459 AB |
364 | ubi = ubi_get_device(ubi->ubi_num); |
365 | if (!ubi) | |
366 | return -ENODEV; | |
367 | ||
801c135c | 368 | if (attr == &dev_eraseblock_size) |
e73f4459 | 369 | ret = sprintf(buf, "%d\n", ubi->leb_size); |
801c135c | 370 | else if (attr == &dev_avail_eraseblocks) |
e73f4459 | 371 | ret = sprintf(buf, "%d\n", ubi->avail_pebs); |
801c135c | 372 | else if (attr == &dev_total_eraseblocks) |
e73f4459 | 373 | ret = sprintf(buf, "%d\n", ubi->good_peb_count); |
801c135c | 374 | else if (attr == &dev_volumes_count) |
4b3cc340 | 375 | ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT); |
801c135c | 376 | else if (attr == &dev_max_ec) |
e73f4459 | 377 | ret = sprintf(buf, "%d\n", ubi->max_ec); |
801c135c | 378 | else if (attr == &dev_reserved_for_bad) |
e73f4459 | 379 | ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs); |
801c135c | 380 | else if (attr == &dev_bad_peb_count) |
e73f4459 | 381 | ret = sprintf(buf, "%d\n", ubi->bad_peb_count); |
801c135c | 382 | else if (attr == &dev_max_vol_count) |
e73f4459 | 383 | ret = sprintf(buf, "%d\n", ubi->vtbl_slots); |
801c135c | 384 | else if (attr == &dev_min_io_size) |
e73f4459 | 385 | ret = sprintf(buf, "%d\n", ubi->min_io_size); |
801c135c | 386 | else if (attr == &dev_bgt_enabled) |
e73f4459 | 387 | ret = sprintf(buf, "%d\n", ubi->thread_enabled); |
b6b76ba4 AB |
388 | else if (attr == &dev_mtd_num) |
389 | ret = sprintf(buf, "%d\n", ubi->mtd->index); | |
525bab71 EG |
390 | else if (attr == &dev_ro_mode) |
391 | ret = sprintf(buf, "%d\n", ubi->ro_mode); | |
801c135c | 392 | else |
b6b76ba4 | 393 | ret = -EINVAL; |
801c135c | 394 | |
e73f4459 AB |
395 | ubi_put_device(ubi); |
396 | return ret; | |
801c135c AB |
397 | } |
398 | ||
53cd255c TI |
399 | static struct attribute *ubi_dev_attrs[] = { |
400 | &dev_eraseblock_size.attr, | |
401 | &dev_avail_eraseblocks.attr, | |
402 | &dev_total_eraseblocks.attr, | |
403 | &dev_volumes_count.attr, | |
404 | &dev_max_ec.attr, | |
405 | &dev_reserved_for_bad.attr, | |
406 | &dev_bad_peb_count.attr, | |
407 | &dev_max_vol_count.attr, | |
408 | &dev_min_io_size.attr, | |
409 | &dev_bgt_enabled.attr, | |
410 | &dev_mtd_num.attr, | |
525bab71 | 411 | &dev_ro_mode.attr, |
53cd255c TI |
412 | NULL |
413 | }; | |
414 | ATTRIBUTE_GROUPS(ubi_dev); | |
415 | ||
36b477d0 AB |
416 | static void dev_release(struct device *dev) |
417 | { | |
418 | struct ubi_device *ubi = container_of(dev, struct ubi_device, dev); | |
419 | ||
420 | kfree(ubi); | |
421 | } | |
801c135c AB |
422 | |
423 | /** | |
424 | * ubi_sysfs_init - initialize sysfs for an UBI device. | |
425 | * @ubi: UBI device description object | |
0bf1c439 AB |
426 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
427 | * taken | |
801c135c AB |
428 | * |
429 | * This function returns zero in case of success and a negative error code in | |
430 | * case of failure. | |
431 | */ | |
0bf1c439 | 432 | static int ubi_sysfs_init(struct ubi_device *ubi, int *ref) |
801c135c AB |
433 | { |
434 | int err; | |
435 | ||
436 | ubi->dev.release = dev_release; | |
49dfc299 | 437 | ubi->dev.devt = ubi->cdev.dev; |
53cd255c TI |
438 | ubi->dev.class = &ubi_class; |
439 | ubi->dev.groups = ubi_dev_groups; | |
160bbab3 | 440 | dev_set_name(&ubi->dev, UBI_NAME_STR"%d", ubi->ubi_num); |
801c135c AB |
441 | err = device_register(&ubi->dev); |
442 | if (err) | |
db6e5770 | 443 | return err; |
801c135c | 444 | |
0bf1c439 | 445 | *ref = 1; |
53cd255c | 446 | return 0; |
801c135c AB |
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 | { | |
801c135c AB |
455 | device_unregister(&ubi->dev); |
456 | } | |
457 | ||
458 | /** | |
0bf1c439 | 459 | * kill_volumes - destroy all user volumes. |
801c135c AB |
460 | * @ubi: UBI device description object |
461 | */ | |
462 | static void kill_volumes(struct ubi_device *ubi) | |
463 | { | |
464 | int i; | |
465 | ||
466 | for (i = 0; i < ubi->vtbl_slots; i++) | |
467 | if (ubi->volumes[i]) | |
89b96b69 | 468 | ubi_free_volume(ubi, ubi->volumes[i]); |
801c135c AB |
469 | } |
470 | ||
471 | /** | |
472 | * uif_init - initialize user interfaces for an UBI device. | |
473 | * @ubi: UBI device description object | |
0bf1c439 AB |
474 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
475 | * taken, otherwise set to %0 | |
476 | * | |
477 | * This function initializes various user interfaces for an UBI device. If the | |
478 | * initialization fails at an early stage, this function frees all the | |
479 | * resources it allocated, returns an error, and @ref is set to %0. However, | |
480 | * if the initialization fails after the UBI device was registered in the | |
481 | * driver core subsystem, this function takes a reference to @ubi->dev, because | |
482 | * otherwise the release function ('dev_release()') would free whole @ubi | |
483 | * object. The @ref argument is set to %1 in this case. The caller has to put | |
484 | * this reference. | |
801c135c AB |
485 | * |
486 | * This function returns zero in case of success and a negative error code in | |
0bf1c439 | 487 | * case of failure. |
801c135c | 488 | */ |
0bf1c439 | 489 | static int uif_init(struct ubi_device *ubi, int *ref) |
801c135c | 490 | { |
8c4c19f1 | 491 | int i, err; |
801c135c AB |
492 | dev_t dev; |
493 | ||
0bf1c439 | 494 | *ref = 0; |
801c135c AB |
495 | sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num); |
496 | ||
497 | /* | |
498 | * Major numbers for the UBI character devices are allocated | |
499 | * dynamically. Major numbers of volume character devices are | |
500 | * equivalent to ones of the corresponding UBI character device. Minor | |
501 | * numbers of UBI character devices are 0, while minor numbers of | |
502 | * volume character devices start from 1. Thus, we allocate one major | |
503 | * number and ubi->vtbl_slots + 1 minor numbers. | |
504 | */ | |
505 | err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name); | |
506 | if (err) { | |
32608703 | 507 | ubi_err(ubi, "cannot register UBI character devices"); |
801c135c AB |
508 | return err; |
509 | } | |
510 | ||
49dfc299 | 511 | ubi_assert(MINOR(dev) == 0); |
801c135c | 512 | cdev_init(&ubi->cdev, &ubi_cdev_operations); |
c8566350 | 513 | dbg_gen("%s major is %u", ubi->ubi_name, MAJOR(dev)); |
801c135c AB |
514 | ubi->cdev.owner = THIS_MODULE; |
515 | ||
801c135c AB |
516 | err = cdev_add(&ubi->cdev, dev, 1); |
517 | if (err) { | |
32608703 | 518 | ubi_err(ubi, "cannot add character device"); |
801c135c AB |
519 | goto out_unreg; |
520 | } | |
521 | ||
0bf1c439 | 522 | err = ubi_sysfs_init(ubi, ref); |
801c135c | 523 | if (err) |
db6e5770 | 524 | goto out_sysfs; |
801c135c AB |
525 | |
526 | for (i = 0; i < ubi->vtbl_slots; i++) | |
527 | if (ubi->volumes[i]) { | |
89b96b69 | 528 | err = ubi_add_volume(ubi, ubi->volumes[i]); |
01f7b309 | 529 | if (err) { |
32608703 | 530 | ubi_err(ubi, "cannot add volume %d", i); |
801c135c | 531 | goto out_volumes; |
01f7b309 | 532 | } |
801c135c AB |
533 | } |
534 | ||
535 | return 0; | |
536 | ||
537 | out_volumes: | |
538 | kill_volumes(ubi); | |
db6e5770 | 539 | out_sysfs: |
0bf1c439 AB |
540 | if (*ref) |
541 | get_device(&ubi->dev); | |
801c135c | 542 | ubi_sysfs_close(ubi); |
801c135c AB |
543 | cdev_del(&ubi->cdev); |
544 | out_unreg: | |
49dfc299 | 545 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
32608703 TB |
546 | ubi_err(ubi, "cannot initialize UBI %s, error %d", |
547 | ubi->ubi_name, err); | |
801c135c AB |
548 | return err; |
549 | } | |
550 | ||
551 | /** | |
552 | * uif_close - close user interfaces for an UBI device. | |
553 | * @ubi: UBI device description object | |
505d1caa AB |
554 | * |
555 | * Note, since this function un-registers UBI volume device objects (@vol->dev), | |
556 | * the memory allocated voe the volumes is freed as well (in the release | |
557 | * function). | |
801c135c AB |
558 | */ |
559 | static void uif_close(struct ubi_device *ubi) | |
560 | { | |
561 | kill_volumes(ubi); | |
562 | ubi_sysfs_close(ubi); | |
563 | cdev_del(&ubi->cdev); | |
49dfc299 | 564 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
801c135c AB |
565 | } |
566 | ||
505d1caa | 567 | /** |
47e1ec70 | 568 | * ubi_free_internal_volumes - free internal volumes. |
505d1caa AB |
569 | * @ubi: UBI device description object |
570 | */ | |
47e1ec70 | 571 | void ubi_free_internal_volumes(struct ubi_device *ubi) |
505d1caa AB |
572 | { |
573 | int i; | |
574 | ||
575 | for (i = ubi->vtbl_slots; | |
576 | i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { | |
577 | kfree(ubi->volumes[i]->eba_tbl); | |
578 | kfree(ubi->volumes[i]); | |
579 | } | |
580 | } | |
581 | ||
95e6fb02 RG |
582 | static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024) |
583 | { | |
584 | int limit, device_pebs; | |
585 | uint64_t device_size; | |
586 | ||
587 | if (!max_beb_per1024) | |
588 | return 0; | |
589 | ||
590 | /* | |
591 | * Here we are using size of the entire flash chip and | |
592 | * not just the MTD partition size because the maximum | |
593 | * number of bad eraseblocks is a percentage of the | |
594 | * whole device and bad eraseblocks are not fairly | |
595 | * distributed over the flash chip. So the worst case | |
596 | * is that all the bad eraseblocks of the chip are in | |
597 | * the MTD partition we are attaching (ubi->mtd). | |
598 | */ | |
599 | device_size = mtd_get_device_size(ubi->mtd); | |
600 | device_pebs = mtd_div_by_eb(device_size, ubi->mtd); | |
601 | limit = mult_frac(device_pebs, max_beb_per1024, 1024); | |
602 | ||
603 | /* Round it up */ | |
604 | if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs) | |
605 | limit += 1; | |
606 | ||
607 | return limit; | |
608 | } | |
609 | ||
801c135c | 610 | /** |
85c6e6e2 | 611 | * io_init - initialize I/O sub-system for a given UBI device. |
801c135c | 612 | * @ubi: UBI device description object |
256334c3 | 613 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
801c135c AB |
614 | * |
615 | * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are | |
616 | * assumed: | |
617 | * o EC header is always at offset zero - this cannot be changed; | |
618 | * o VID header starts just after the EC header at the closest address | |
cdfa788a | 619 | * aligned to @io->hdrs_min_io_size; |
801c135c | 620 | * o data starts just after the VID header at the closest address aligned to |
cdfa788a | 621 | * @io->min_io_size |
801c135c AB |
622 | * |
623 | * This function returns zero in case of success and a negative error code in | |
624 | * case of failure. | |
625 | */ | |
256334c3 | 626 | static int io_init(struct ubi_device *ubi, int max_beb_per1024) |
801c135c | 627 | { |
719bb840 AB |
628 | dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb)); |
629 | dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry)); | |
630 | ||
801c135c AB |
631 | if (ubi->mtd->numeraseregions != 0) { |
632 | /* | |
633 | * Some flashes have several erase regions. Different regions | |
634 | * may have different eraseblock size and other | |
635 | * characteristics. It looks like mostly multi-region flashes | |
636 | * have one "main" region and one or more small regions to | |
637 | * store boot loader code or boot parameters or whatever. I | |
638 | * guess we should just pick the largest region. But this is | |
639 | * not implemented. | |
640 | */ | |
32608703 | 641 | ubi_err(ubi, "multiple regions, not implemented"); |
801c135c AB |
642 | return -EINVAL; |
643 | } | |
644 | ||
dd38fccf | 645 | if (ubi->vid_hdr_offset < 0) |
cdfa788a AB |
646 | return -EINVAL; |
647 | ||
801c135c AB |
648 | /* |
649 | * Note, in this implementation we support MTD devices with 0x7FFFFFFF | |
650 | * physical eraseblocks maximum. | |
651 | */ | |
652 | ||
653 | ubi->peb_size = ubi->mtd->erasesize; | |
69423d99 | 654 | ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd); |
801c135c AB |
655 | ubi->flash_size = ubi->mtd->size; |
656 | ||
8beeb3bb | 657 | if (mtd_can_have_bb(ubi->mtd)) { |
801c135c | 658 | ubi->bad_allowed = 1; |
95e6fb02 | 659 | ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024); |
8beeb3bb | 660 | } |
801c135c | 661 | |
ebf53f42 AB |
662 | if (ubi->mtd->type == MTD_NORFLASH) { |
663 | ubi_assert(ubi->mtd->writesize == 1); | |
664 | ubi->nor_flash = 1; | |
665 | } | |
666 | ||
801c135c AB |
667 | ubi->min_io_size = ubi->mtd->writesize; |
668 | ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; | |
669 | ||
cadb40cc KP |
670 | /* |
671 | * Make sure minimal I/O unit is power of 2. Note, there is no | |
672 | * fundamental reason for this assumption. It is just an optimization | |
673 | * which allows us to avoid costly division operations. | |
674 | */ | |
7753f169 | 675 | if (!is_power_of_2(ubi->min_io_size)) { |
32608703 | 676 | ubi_err(ubi, "min. I/O unit (%d) is not power of 2", |
01f7b309 | 677 | ubi->min_io_size); |
801c135c AB |
678 | return -EINVAL; |
679 | } | |
680 | ||
681 | ubi_assert(ubi->hdrs_min_io_size > 0); | |
682 | ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size); | |
683 | ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0); | |
684 | ||
30b542ef AB |
685 | ubi->max_write_size = ubi->mtd->writebufsize; |
686 | /* | |
687 | * Maximum write size has to be greater or equivalent to min. I/O | |
688 | * size, and be multiple of min. I/O size. | |
689 | */ | |
690 | if (ubi->max_write_size < ubi->min_io_size || | |
691 | ubi->max_write_size % ubi->min_io_size || | |
692 | !is_power_of_2(ubi->max_write_size)) { | |
32608703 | 693 | ubi_err(ubi, "bad write buffer size %d for %d min. I/O unit", |
30b542ef AB |
694 | ubi->max_write_size, ubi->min_io_size); |
695 | return -EINVAL; | |
696 | } | |
697 | ||
801c135c AB |
698 | /* Calculate default aligned sizes of EC and VID headers */ |
699 | ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size); | |
700 | ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size); | |
701 | ||
719bb840 AB |
702 | dbg_gen("min_io_size %d", ubi->min_io_size); |
703 | dbg_gen("max_write_size %d", ubi->max_write_size); | |
704 | dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size); | |
705 | dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize); | |
706 | dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize); | |
801c135c AB |
707 | |
708 | if (ubi->vid_hdr_offset == 0) | |
709 | /* Default offset */ | |
710 | ubi->vid_hdr_offset = ubi->vid_hdr_aloffset = | |
711 | ubi->ec_hdr_alsize; | |
712 | else { | |
713 | ubi->vid_hdr_aloffset = ubi->vid_hdr_offset & | |
714 | ~(ubi->hdrs_min_io_size - 1); | |
715 | ubi->vid_hdr_shift = ubi->vid_hdr_offset - | |
716 | ubi->vid_hdr_aloffset; | |
717 | } | |
718 | ||
719 | /* Similar for the data offset */ | |
e8cfe009 | 720 | ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE; |
dd38fccf | 721 | ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size); |
801c135c | 722 | |
719bb840 AB |
723 | dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset); |
724 | dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset); | |
725 | dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift); | |
726 | dbg_gen("leb_start %d", ubi->leb_start); | |
801c135c AB |
727 | |
728 | /* The shift must be aligned to 32-bit boundary */ | |
729 | if (ubi->vid_hdr_shift % 4) { | |
32608703 | 730 | ubi_err(ubi, "unaligned VID header shift %d", |
801c135c AB |
731 | ubi->vid_hdr_shift); |
732 | return -EINVAL; | |
733 | } | |
734 | ||
735 | /* Check sanity */ | |
736 | if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE || | |
737 | ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE || | |
738 | ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE || | |
cadb40cc | 739 | ubi->leb_start & (ubi->min_io_size - 1)) { |
32608703 | 740 | ubi_err(ubi, "bad VID header (%d) or data offsets (%d)", |
801c135c AB |
741 | ubi->vid_hdr_offset, ubi->leb_start); |
742 | return -EINVAL; | |
743 | } | |
744 | ||
b86a2c56 AB |
745 | /* |
746 | * Set maximum amount of physical erroneous eraseblocks to be 10%. | |
747 | * Erroneous PEB are those which have read errors. | |
748 | */ | |
749 | ubi->max_erroneous = ubi->peb_count / 10; | |
750 | if (ubi->max_erroneous < 16) | |
751 | ubi->max_erroneous = 16; | |
719bb840 | 752 | dbg_gen("max_erroneous %d", ubi->max_erroneous); |
b86a2c56 | 753 | |
801c135c AB |
754 | /* |
755 | * It may happen that EC and VID headers are situated in one minimal | |
756 | * I/O unit. In this case we can only accept this UBI image in | |
757 | * read-only mode. | |
758 | */ | |
759 | if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) { | |
32608703 | 760 | ubi_warn(ubi, "EC and VID headers are in the same minimal I/O unit, switch to read-only mode"); |
801c135c AB |
761 | ubi->ro_mode = 1; |
762 | } | |
763 | ||
764 | ubi->leb_size = ubi->peb_size - ubi->leb_start; | |
765 | ||
766 | if (!(ubi->mtd->flags & MTD_WRITEABLE)) { | |
32608703 | 767 | ubi_msg(ubi, "MTD device %d is write-protected, attach in read-only mode", |
049333ce | 768 | ubi->mtd->index); |
801c135c AB |
769 | ubi->ro_mode = 1; |
770 | } | |
771 | ||
801c135c | 772 | /* |
fbd0107f | 773 | * Note, ideally, we have to initialize @ubi->bad_peb_count here. But |
801c135c AB |
774 | * unfortunately, MTD does not provide this information. We should loop |
775 | * over all physical eraseblocks and invoke mtd->block_is_bad() for | |
fbd0107f AB |
776 | * each physical eraseblock. So, we leave @ubi->bad_peb_count |
777 | * uninitialized so far. | |
801c135c AB |
778 | */ |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
4ccf8cff AB |
783 | /** |
784 | * autoresize - re-size the volume which has the "auto-resize" flag set. | |
785 | * @ubi: UBI device description object | |
786 | * @vol_id: ID of the volume to re-size | |
787 | * | |
fbd0107f | 788 | * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in |
4ccf8cff AB |
789 | * the volume table to the largest possible size. See comments in ubi-header.h |
790 | * for more description of the flag. Returns zero in case of success and a | |
791 | * negative error code in case of failure. | |
792 | */ | |
793 | static int autoresize(struct ubi_device *ubi, int vol_id) | |
794 | { | |
795 | struct ubi_volume_desc desc; | |
796 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
797 | int err, old_reserved_pebs = vol->reserved_pebs; | |
798 | ||
abb3e011 | 799 | if (ubi->ro_mode) { |
32608703 | 800 | ubi_warn(ubi, "skip auto-resize because of R/O mode"); |
abb3e011 AB |
801 | return 0; |
802 | } | |
803 | ||
4ccf8cff AB |
804 | /* |
805 | * Clear the auto-resize flag in the volume in-memory copy of the | |
505d1caa | 806 | * volume table, and 'ubi_resize_volume()' will propagate this change |
4ccf8cff AB |
807 | * to the flash. |
808 | */ | |
809 | ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG; | |
810 | ||
811 | if (ubi->avail_pebs == 0) { | |
812 | struct ubi_vtbl_record vtbl_rec; | |
813 | ||
814 | /* | |
505d1caa | 815 | * No available PEBs to re-size the volume, clear the flag on |
4ccf8cff AB |
816 | * flash and exit. |
817 | */ | |
d856c13c | 818 | vtbl_rec = ubi->vtbl[vol_id]; |
4ccf8cff AB |
819 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
820 | if (err) | |
32608703 | 821 | ubi_err(ubi, "cannot clean auto-resize flag for volume %d", |
4ccf8cff AB |
822 | vol_id); |
823 | } else { | |
824 | desc.vol = vol; | |
825 | err = ubi_resize_volume(&desc, | |
826 | old_reserved_pebs + ubi->avail_pebs); | |
827 | if (err) | |
32608703 TB |
828 | ubi_err(ubi, "cannot auto-resize volume %d", |
829 | vol_id); | |
4ccf8cff AB |
830 | } |
831 | ||
832 | if (err) | |
833 | return err; | |
834 | ||
32608703 TB |
835 | ubi_msg(ubi, "volume %d (\"%s\") re-sized from %d to %d LEBs", |
836 | vol_id, vol->name, old_reserved_pebs, vol->reserved_pebs); | |
4ccf8cff AB |
837 | return 0; |
838 | } | |
839 | ||
801c135c | 840 | /** |
cdfa788a | 841 | * ubi_attach_mtd_dev - attach an MTD device. |
ebaaf1af | 842 | * @mtd: MTD device description object |
897a316c | 843 | * @ubi_num: number to assign to the new UBI device |
801c135c | 844 | * @vid_hdr_offset: VID header offset |
edac493d | 845 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
801c135c | 846 | * |
897a316c AB |
847 | * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number |
848 | * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in | |
505d1caa | 849 | * which case this function finds a vacant device number and assigns it |
897a316c AB |
850 | * automatically. Returns the new UBI device number in case of success and a |
851 | * negative error code in case of failure. | |
cdfa788a AB |
852 | * |
853 | * Note, the invocations of this function has to be serialized by the | |
854 | * @ubi_devices_mutex. | |
801c135c | 855 | */ |
256334c3 RG |
856 | int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, |
857 | int vid_hdr_offset, int max_beb_per1024) | |
801c135c AB |
858 | { |
859 | struct ubi_device *ubi; | |
0bf1c439 | 860 | int i, err, ref = 0; |
801c135c | 861 | |
d2f588f9 RG |
862 | if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT) |
863 | return -EINVAL; | |
864 | ||
865 | if (!max_beb_per1024) | |
866 | max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT; | |
867 | ||
cdfa788a AB |
868 | /* |
869 | * Check if we already have the same MTD device attached. | |
870 | * | |
871 | * Note, this function assumes that UBI devices creations and deletions | |
872 | * are serialized, so it does not take the &ubi_devices_lock. | |
873 | */ | |
897a316c | 874 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
b96bf4c3 | 875 | ubi = ubi_devices[i]; |
cdfa788a | 876 | if (ubi && mtd->index == ubi->mtd->index) { |
32608703 | 877 | ubi_err(ubi, "mtd%d is already attached to ubi%d", |
801c135c | 878 | mtd->index, i); |
897a316c | 879 | return -EEXIST; |
801c135c | 880 | } |
897a316c | 881 | } |
801c135c | 882 | |
897a316c AB |
883 | /* |
884 | * Make sure this MTD device is not emulated on top of an UBI volume | |
885 | * already. Well, generally this recursion works fine, but there are | |
886 | * different problems like the UBI module takes a reference to itself | |
887 | * by attaching (and thus, opening) the emulated MTD device. This | |
888 | * results in inability to unload the module. And in general it makes | |
889 | * no sense to attach emulated MTD devices, so we prohibit this. | |
890 | */ | |
891 | if (mtd->type == MTD_UBIVOLUME) { | |
32608703 | 892 | ubi_err(ubi, "refuse attaching mtd%d - it is already emulated on top of UBI", |
049333ce | 893 | mtd->index); |
897a316c AB |
894 | return -EINVAL; |
895 | } | |
896 | ||
897 | if (ubi_num == UBI_DEV_NUM_AUTO) { | |
898 | /* Search for an empty slot in the @ubi_devices array */ | |
899 | for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) | |
900 | if (!ubi_devices[ubi_num]) | |
901 | break; | |
902 | if (ubi_num == UBI_MAX_DEVICES) { | |
32608703 | 903 | ubi_err(ubi, "only %d UBI devices may be created", |
9c9ec147 | 904 | UBI_MAX_DEVICES); |
897a316c AB |
905 | return -ENFILE; |
906 | } | |
907 | } else { | |
908 | if (ubi_num >= UBI_MAX_DEVICES) | |
909 | return -EINVAL; | |
b96bf4c3 | 910 | |
897a316c AB |
911 | /* Make sure ubi_num is not busy */ |
912 | if (ubi_devices[ubi_num]) { | |
45fc5c81 | 913 | ubi_err(ubi, "already exists"); |
897a316c AB |
914 | return -EEXIST; |
915 | } | |
b96bf4c3 AB |
916 | } |
917 | ||
cdfa788a AB |
918 | ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL); |
919 | if (!ubi) | |
920 | return -ENOMEM; | |
801c135c | 921 | |
cdfa788a | 922 | ubi->mtd = mtd; |
897a316c | 923 | ubi->ubi_num = ubi_num; |
801c135c | 924 | ubi->vid_hdr_offset = vid_hdr_offset; |
4ccf8cff AB |
925 | ubi->autoresize_vol_id = -1; |
926 | ||
77e6c2f0 RW |
927 | #ifdef CONFIG_MTD_UBI_FASTMAP |
928 | ubi->fm_pool.used = ubi->fm_pool.size = 0; | |
929 | ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0; | |
930 | ||
931 | /* | |
932 | * fm_pool.max_size is 5% of the total number of PEBs but it's also | |
933 | * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE. | |
934 | */ | |
935 | ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size, | |
936 | ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE); | |
212240df | 937 | ubi->fm_pool.max_size = max(ubi->fm_pool.max_size, |
938 | UBI_FM_MIN_POOL_SIZE); | |
77e6c2f0 | 939 | |
68e3226b | 940 | ubi->fm_wl_pool.max_size = ubi->fm_pool.max_size / 2; |
77e6c2f0 | 941 | ubi->fm_disabled = !fm_autoconvert; |
479c2c0c RW |
942 | if (fm_debug) |
943 | ubi_enable_dbg_chk_fastmap(ubi); | |
77e6c2f0 RW |
944 | |
945 | if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) | |
946 | <= UBI_FM_MAX_START) { | |
32608703 | 947 | ubi_err(ubi, "More than %i PEBs are needed for fastmap, sorry.", |
77e6c2f0 RW |
948 | UBI_FM_MAX_START); |
949 | ubi->fm_disabled = 1; | |
950 | } | |
951 | ||
32608703 TB |
952 | ubi_msg(ubi, "default fastmap pool size: %d", ubi->fm_pool.max_size); |
953 | ubi_msg(ubi, "default fastmap WL pool size: %d", | |
954 | ubi->fm_wl_pool.max_size); | |
77e6c2f0 RW |
955 | #else |
956 | ubi->fm_disabled = 1; | |
957 | #endif | |
4ccf8cff AB |
958 | mutex_init(&ubi->buf_mutex); |
959 | mutex_init(&ubi->ckvol_mutex); | |
f089c0b2 | 960 | mutex_init(&ubi->device_mutex); |
4ccf8cff | 961 | spin_lock_init(&ubi->volumes_lock); |
111ab0b2 RW |
962 | init_rwsem(&ubi->fm_protect); |
963 | init_rwsem(&ubi->fm_eba_sem); | |
cdfa788a | 964 | |
45fc5c81 | 965 | ubi_msg(ubi, "attaching mtd%d", mtd->index); |
cdfa788a | 966 | |
256334c3 | 967 | err = io_init(ubi, max_beb_per1024); |
801c135c AB |
968 | if (err) |
969 | goto out_free; | |
970 | ||
ad5942ba | 971 | err = -ENOMEM; |
0ca39d74 AB |
972 | ubi->peb_buf = vmalloc(ubi->peb_size); |
973 | if (!ubi->peb_buf) | |
e88d6e10 AB |
974 | goto out_free; |
975 | ||
77e6c2f0 RW |
976 | #ifdef CONFIG_MTD_UBI_FASTMAP |
977 | ubi->fm_size = ubi_calc_fm_size(ubi); | |
978 | ubi->fm_buf = vzalloc(ubi->fm_size); | |
979 | if (!ubi->fm_buf) | |
980 | goto out_free; | |
981 | #endif | |
dac6e208 | 982 | err = ubi_attach(ubi, 0); |
801c135c | 983 | if (err) { |
32608703 TB |
984 | ubi_err(ubi, "failed to attach mtd%d, error %d", |
985 | mtd->index, err); | |
eab73772 | 986 | goto out_free; |
801c135c AB |
987 | } |
988 | ||
4ccf8cff AB |
989 | if (ubi->autoresize_vol_id != -1) { |
990 | err = autoresize(ubi, ubi->autoresize_vol_id); | |
991 | if (err) | |
992 | goto out_detach; | |
993 | } | |
994 | ||
0bf1c439 | 995 | err = uif_init(ubi, &ref); |
801c135c | 996 | if (err) |
0bf1c439 | 997 | goto out_detach; |
801c135c | 998 | |
2a734bb8 AB |
999 | err = ubi_debugfs_init_dev(ubi); |
1000 | if (err) | |
1001 | goto out_uif; | |
1002 | ||
f170168b | 1003 | ubi->bgt_thread = kthread_create(ubi_thread, ubi, "%s", ubi->bgt_name); |
cdfa788a AB |
1004 | if (IS_ERR(ubi->bgt_thread)) { |
1005 | err = PTR_ERR(ubi->bgt_thread); | |
32608703 TB |
1006 | ubi_err(ubi, "cannot spawn \"%s\", error %d", |
1007 | ubi->bgt_name, err); | |
2a734bb8 | 1008 | goto out_debugfs; |
cdfa788a AB |
1009 | } |
1010 | ||
32608703 TB |
1011 | ubi_msg(ubi, "attached mtd%d (name \"%s\", size %llu MiB)", |
1012 | mtd->index, mtd->name, ubi->flash_size >> 20); | |
1013 | ubi_msg(ubi, "PEB size: %d bytes (%d KiB), LEB size: %d bytes", | |
719bb840 | 1014 | ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size); |
32608703 | 1015 | ubi_msg(ubi, "min./max. I/O unit sizes: %d/%d, sub-page size %d", |
719bb840 | 1016 | ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size); |
32608703 | 1017 | ubi_msg(ubi, "VID header offset: %d (aligned %d), data offset: %d", |
719bb840 | 1018 | ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start); |
32608703 | 1019 | ubi_msg(ubi, "good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d", |
719bb840 | 1020 | ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count); |
32608703 | 1021 | ubi_msg(ubi, "user volume: %d, internal volumes: %d, max. volumes count: %d", |
719bb840 AB |
1022 | ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT, |
1023 | ubi->vtbl_slots); | |
32608703 | 1024 | ubi_msg(ubi, "max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u", |
719bb840 AB |
1025 | ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD, |
1026 | ubi->image_seq); | |
32608703 | 1027 | ubi_msg(ubi, "available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d", |
719bb840 | 1028 | ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs); |
801c135c | 1029 | |
ddbd3b61 AB |
1030 | /* |
1031 | * The below lock makes sure we do not race with 'ubi_thread()' which | |
1032 | * checks @ubi->thread_enabled. Otherwise we may fail to wake it up. | |
1033 | */ | |
1034 | spin_lock(&ubi->wl_lock); | |
28237e45 | 1035 | ubi->thread_enabled = 1; |
d37e6bf6 | 1036 | wake_up_process(ubi->bgt_thread); |
ddbd3b61 | 1037 | spin_unlock(&ubi->wl_lock); |
801c135c | 1038 | |
897a316c | 1039 | ubi_devices[ubi_num] = ubi; |
0e0ee1cc | 1040 | ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL); |
897a316c | 1041 | return ubi_num; |
801c135c | 1042 | |
2a734bb8 AB |
1043 | out_debugfs: |
1044 | ubi_debugfs_exit_dev(ubi); | |
cdfa788a | 1045 | out_uif: |
01a4110d AB |
1046 | get_device(&ubi->dev); |
1047 | ubi_assert(ref); | |
cdfa788a | 1048 | uif_close(ubi); |
801c135c | 1049 | out_detach: |
801c135c | 1050 | ubi_wl_close(ubi); |
47e1ec70 | 1051 | ubi_free_internal_volumes(ubi); |
d7f0c4dc | 1052 | vfree(ubi->vtbl); |
801c135c | 1053 | out_free: |
0ca39d74 | 1054 | vfree(ubi->peb_buf); |
77e6c2f0 | 1055 | vfree(ubi->fm_buf); |
0bf1c439 AB |
1056 | if (ref) |
1057 | put_device(&ubi->dev); | |
1058 | else | |
1059 | kfree(ubi); | |
801c135c AB |
1060 | return err; |
1061 | } | |
1062 | ||
1063 | /** | |
cdfa788a AB |
1064 | * ubi_detach_mtd_dev - detach an MTD device. |
1065 | * @ubi_num: UBI device number to detach from | |
1066 | * @anyway: detach MTD even if device reference count is not zero | |
1067 | * | |
1068 | * This function destroys an UBI device number @ubi_num and detaches the | |
1069 | * underlying MTD device. Returns zero in case of success and %-EBUSY if the | |
1070 | * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not | |
1071 | * exist. | |
1072 | * | |
1073 | * Note, the invocations of this function has to be serialized by the | |
1074 | * @ubi_devices_mutex. | |
801c135c | 1075 | */ |
cdfa788a | 1076 | int ubi_detach_mtd_dev(int ubi_num, int anyway) |
801c135c | 1077 | { |
cdfa788a AB |
1078 | struct ubi_device *ubi; |
1079 | ||
1080 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
1081 | return -EINVAL; | |
1082 | ||
0e0ee1cc DP |
1083 | ubi = ubi_get_device(ubi_num); |
1084 | if (!ubi) | |
cdfa788a | 1085 | return -EINVAL; |
cdfa788a | 1086 | |
0e0ee1cc DP |
1087 | spin_lock(&ubi_devices_lock); |
1088 | put_device(&ubi->dev); | |
1089 | ubi->ref_count -= 1; | |
cdfa788a AB |
1090 | if (ubi->ref_count) { |
1091 | if (!anyway) { | |
897a316c | 1092 | spin_unlock(&ubi_devices_lock); |
cdfa788a AB |
1093 | return -EBUSY; |
1094 | } | |
1095 | /* This may only happen if there is a bug */ | |
32608703 | 1096 | ubi_err(ubi, "%s reference count %d, destroy anyway", |
cdfa788a AB |
1097 | ubi->ubi_name, ubi->ref_count); |
1098 | } | |
897a316c | 1099 | ubi_devices[ubi_num] = NULL; |
cdfa788a AB |
1100 | spin_unlock(&ubi_devices_lock); |
1101 | ||
897a316c | 1102 | ubi_assert(ubi_num == ubi->ubi_num); |
0e0ee1cc | 1103 | ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL); |
32608703 | 1104 | ubi_msg(ubi, "detaching mtd%d", ubi->mtd->index); |
77e6c2f0 RW |
1105 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1106 | /* If we don't write a new fastmap at detach time we lose all | |
24b7a347 RW |
1107 | * EC updates that have been made since the last written fastmap. |
1108 | * In case of fastmap debugging we omit the update to simulate an | |
1109 | * unclean shutdown. */ | |
1110 | if (!ubi_dbg_chk_fastmap(ubi)) | |
1111 | ubi_update_fastmap(ubi); | |
77e6c2f0 | 1112 | #endif |
cdfa788a AB |
1113 | /* |
1114 | * Before freeing anything, we have to stop the background thread to | |
1115 | * prevent it from doing anything on this device while we are freeing. | |
1116 | */ | |
1117 | if (ubi->bgt_thread) | |
1118 | kthread_stop(ubi->bgt_thread); | |
801c135c | 1119 | |
36b477d0 AB |
1120 | /* |
1121 | * Get a reference to the device in order to prevent 'dev_release()' | |
0bf1c439 | 1122 | * from freeing the @ubi object. |
36b477d0 AB |
1123 | */ |
1124 | get_device(&ubi->dev); | |
1125 | ||
2a734bb8 | 1126 | ubi_debugfs_exit_dev(ubi); |
801c135c | 1127 | uif_close(ubi); |
77e6c2f0 | 1128 | |
801c135c | 1129 | ubi_wl_close(ubi); |
47e1ec70 | 1130 | ubi_free_internal_volumes(ubi); |
92ad8f37 | 1131 | vfree(ubi->vtbl); |
801c135c | 1132 | put_mtd_device(ubi->mtd); |
0ca39d74 | 1133 | vfree(ubi->peb_buf); |
77e6c2f0 | 1134 | vfree(ubi->fm_buf); |
32608703 | 1135 | ubi_msg(ubi, "mtd%d is detached", ubi->mtd->index); |
36b477d0 | 1136 | put_device(&ubi->dev); |
cdfa788a | 1137 | return 0; |
801c135c AB |
1138 | } |
1139 | ||
cdfa788a | 1140 | /** |
f9b0080e AB |
1141 | * open_mtd_by_chdev - open an MTD device by its character device node path. |
1142 | * @mtd_dev: MTD character device node path | |
1143 | * | |
1144 | * This helper function opens an MTD device by its character node device path. | |
1145 | * Returns MTD device description object in case of success and a negative | |
1146 | * error code in case of failure. | |
1147 | */ | |
1148 | static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev) | |
1149 | { | |
87f15d4a AV |
1150 | struct kstat stat; |
1151 | int err, minor; | |
f9b0080e AB |
1152 | |
1153 | /* Probably this is an MTD character device node path */ | |
87f15d4a | 1154 | err = vfs_stat(mtd_dev, &stat); |
f9b0080e AB |
1155 | if (err) |
1156 | return ERR_PTR(err); | |
1157 | ||
1158 | /* MTD device number is defined by the major / minor numbers */ | |
87f15d4a | 1159 | if (MAJOR(stat.rdev) != MTD_CHAR_MAJOR || !S_ISCHR(stat.mode)) |
f9b0080e AB |
1160 | return ERR_PTR(-EINVAL); |
1161 | ||
87f15d4a | 1162 | minor = MINOR(stat.rdev); |
f9b0080e AB |
1163 | if (minor & 1) |
1164 | /* | |
1165 | * Just do not think the "/dev/mtdrX" devices support is need, | |
1166 | * so do not support them to avoid doing extra work. | |
1167 | */ | |
1168 | return ERR_PTR(-EINVAL); | |
1169 | ||
1170 | return get_mtd_device(NULL, minor / 2); | |
1171 | } | |
1172 | ||
1173 | /** | |
1174 | * open_mtd_device - open MTD device by name, character device path, or number. | |
1175 | * @mtd_dev: name, character device node path, or MTD device device number | |
cdfa788a | 1176 | * |
d1f3dd6c | 1177 | * This function tries to open and MTD device described by @mtd_dev string, |
f9b0080e AB |
1178 | * which is first treated as ASCII MTD device number, and if it is not true, it |
1179 | * is treated as MTD device name, and if that is also not true, it is treated | |
1180 | * as MTD character device node path. Returns MTD device description object in | |
1181 | * case of success and a negative error code in case of failure. | |
cdfa788a AB |
1182 | */ |
1183 | static struct mtd_info * __init open_mtd_device(const char *mtd_dev) | |
1184 | { | |
1185 | struct mtd_info *mtd; | |
d1f3dd6c AB |
1186 | int mtd_num; |
1187 | char *endp; | |
cdfa788a | 1188 | |
d1f3dd6c AB |
1189 | mtd_num = simple_strtoul(mtd_dev, &endp, 0); |
1190 | if (*endp != '\0' || mtd_dev == endp) { | |
cdfa788a | 1191 | /* |
d1f3dd6c AB |
1192 | * This does not look like an ASCII integer, probably this is |
1193 | * MTD device name. | |
cdfa788a | 1194 | */ |
d1f3dd6c | 1195 | mtd = get_mtd_device_nm(mtd_dev); |
f9b0080e AB |
1196 | if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV) |
1197 | /* Probably this is an MTD character device node path */ | |
1198 | mtd = open_mtd_by_chdev(mtd_dev); | |
d1f3dd6c | 1199 | } else |
cdfa788a | 1200 | mtd = get_mtd_device(NULL, mtd_num); |
cdfa788a AB |
1201 | |
1202 | return mtd; | |
1203 | } | |
1204 | ||
801c135c AB |
1205 | static int __init ubi_init(void) |
1206 | { | |
1207 | int err, i, k; | |
1208 | ||
1209 | /* Ensure that EC and VID headers have correct size */ | |
1210 | BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64); | |
1211 | BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64); | |
1212 | ||
1213 | if (mtd_devs > UBI_MAX_DEVICES) { | |
32608703 TB |
1214 | pr_err("UBI error: too many MTD devices, maximum is %d", |
1215 | UBI_MAX_DEVICES); | |
801c135c AB |
1216 | return -EINVAL; |
1217 | } | |
1218 | ||
9f961b57 | 1219 | /* Create base sysfs directory and sysfs files */ |
53cd255c TI |
1220 | err = class_register(&ubi_class); |
1221 | if (err < 0) | |
1222 | return err; | |
9f961b57 AB |
1223 | |
1224 | err = misc_register(&ubi_ctrl_cdev); | |
1225 | if (err) { | |
32608703 | 1226 | pr_err("UBI error: cannot register device"); |
53cd255c | 1227 | goto out; |
9f961b57 | 1228 | } |
801c135c | 1229 | |
06b68ba1 | 1230 | ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab", |
c4506092 AB |
1231 | sizeof(struct ubi_wl_entry), |
1232 | 0, 0, NULL); | |
4d525145 JL |
1233 | if (!ubi_wl_entry_slab) { |
1234 | err = -ENOMEM; | |
b9a06623 | 1235 | goto out_dev_unreg; |
4d525145 | 1236 | } |
06b68ba1 | 1237 | |
2a734bb8 AB |
1238 | err = ubi_debugfs_init(); |
1239 | if (err) | |
1240 | goto out_slab; | |
1241 | ||
1242 | ||
801c135c AB |
1243 | /* Attach MTD devices */ |
1244 | for (i = 0; i < mtd_devs; i++) { | |
1245 | struct mtd_dev_param *p = &mtd_dev_param[i]; | |
cdfa788a | 1246 | struct mtd_info *mtd; |
801c135c AB |
1247 | |
1248 | cond_resched(); | |
cdfa788a AB |
1249 | |
1250 | mtd = open_mtd_device(p->name); | |
1251 | if (IS_ERR(mtd)) { | |
1252 | err = PTR_ERR(mtd); | |
32608703 TB |
1253 | pr_err("UBI error: cannot open mtd %s, error %d", |
1254 | p->name, err); | |
1557b9e1 MF |
1255 | /* See comment below re-ubi_is_module(). */ |
1256 | if (ubi_is_module()) | |
1257 | goto out_detach; | |
1258 | continue; | |
cdfa788a AB |
1259 | } |
1260 | ||
1261 | mutex_lock(&ubi_devices_mutex); | |
83ff59a0 | 1262 | err = ubi_attach_mtd_dev(mtd, p->ubi_num, |
edac493d | 1263 | p->vid_hdr_offs, p->max_beb_per1024); |
cdfa788a AB |
1264 | mutex_unlock(&ubi_devices_mutex); |
1265 | if (err < 0) { | |
32608703 TB |
1266 | pr_err("UBI error: cannot attach mtd%d", |
1267 | mtd->index); | |
af7ad7a0 MKB |
1268 | put_mtd_device(mtd); |
1269 | ||
1270 | /* | |
1271 | * Originally UBI stopped initializing on any error. | |
1272 | * However, later on it was found out that this | |
1273 | * behavior is not very good when UBI is compiled into | |
1274 | * the kernel and the MTD devices to attach are passed | |
1275 | * through the command line. Indeed, UBI failure | |
1276 | * stopped whole boot sequence. | |
1277 | * | |
1278 | * To fix this, we changed the behavior for the | |
1279 | * non-module case, but preserved the old behavior for | |
1280 | * the module case, just for compatibility. This is a | |
1281 | * little inconsistent, though. | |
1282 | */ | |
1283 | if (ubi_is_module()) | |
1284 | goto out_detach; | |
9f961b57 | 1285 | } |
801c135c AB |
1286 | } |
1287 | ||
9d54c8a3 EG |
1288 | err = ubiblock_init(); |
1289 | if (err) { | |
32608703 | 1290 | pr_err("UBI error: block: cannot initialize, error %d", err); |
9d54c8a3 EG |
1291 | |
1292 | /* See comment above re-ubi_is_module(). */ | |
1293 | if (ubi_is_module()) | |
1294 | goto out_detach; | |
1295 | } | |
1296 | ||
801c135c AB |
1297 | return 0; |
1298 | ||
1299 | out_detach: | |
1300 | for (k = 0; k < i; k++) | |
cdfa788a AB |
1301 | if (ubi_devices[k]) { |
1302 | mutex_lock(&ubi_devices_mutex); | |
1303 | ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1); | |
1304 | mutex_unlock(&ubi_devices_mutex); | |
1305 | } | |
2a734bb8 AB |
1306 | ubi_debugfs_exit(); |
1307 | out_slab: | |
06b68ba1 | 1308 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 AB |
1309 | out_dev_unreg: |
1310 | misc_deregister(&ubi_ctrl_cdev); | |
9f961b57 | 1311 | out: |
53cd255c | 1312 | class_unregister(&ubi_class); |
32608703 | 1313 | pr_err("UBI error: cannot initialize UBI, error %d", err); |
801c135c AB |
1314 | return err; |
1315 | } | |
cf38aca5 | 1316 | late_initcall(ubi_init); |
801c135c AB |
1317 | |
1318 | static void __exit ubi_exit(void) | |
1319 | { | |
b96bf4c3 | 1320 | int i; |
801c135c | 1321 | |
9d54c8a3 EG |
1322 | ubiblock_exit(); |
1323 | ||
b96bf4c3 | 1324 | for (i = 0; i < UBI_MAX_DEVICES; i++) |
cdfa788a AB |
1325 | if (ubi_devices[i]) { |
1326 | mutex_lock(&ubi_devices_mutex); | |
1327 | ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1); | |
1328 | mutex_unlock(&ubi_devices_mutex); | |
1329 | } | |
2a734bb8 | 1330 | ubi_debugfs_exit(); |
06b68ba1 | 1331 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 | 1332 | misc_deregister(&ubi_ctrl_cdev); |
53cd255c | 1333 | class_unregister(&ubi_class); |
801c135c AB |
1334 | } |
1335 | module_exit(ubi_exit); | |
1336 | ||
1337 | /** | |
ebaaf1af | 1338 | * bytes_str_to_int - convert a number of bytes string into an integer. |
801c135c AB |
1339 | * @str: the string to convert |
1340 | * | |
1341 | * This function returns positive resulting integer in case of success and a | |
1342 | * negative error code in case of failure. | |
1343 | */ | |
1344 | static int __init bytes_str_to_int(const char *str) | |
1345 | { | |
1346 | char *endp; | |
1347 | unsigned long result; | |
1348 | ||
1349 | result = simple_strtoul(str, &endp, 0); | |
774b1382 | 1350 | if (str == endp || result >= INT_MAX) { |
32608703 | 1351 | pr_err("UBI error: incorrect bytes count: \"%s\"\n", str); |
801c135c AB |
1352 | return -EINVAL; |
1353 | } | |
1354 | ||
1355 | switch (*endp) { | |
1356 | case 'G': | |
1357 | result *= 1024; | |
1358 | case 'M': | |
1359 | result *= 1024; | |
1360 | case 'K': | |
801c135c | 1361 | result *= 1024; |
aeddb877 | 1362 | if (endp[1] == 'i' && endp[2] == 'B') |
801c135c AB |
1363 | endp += 2; |
1364 | case '\0': | |
1365 | break; | |
1366 | default: | |
32608703 | 1367 | pr_err("UBI error: incorrect bytes count: \"%s\"\n", str); |
801c135c AB |
1368 | return -EINVAL; |
1369 | } | |
1370 | ||
1371 | return result; | |
1372 | } | |
1373 | ||
1374 | /** | |
1375 | * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter. | |
1376 | * @val: the parameter value to parse | |
1377 | * @kp: not used | |
1378 | * | |
1379 | * This function returns zero in case of success and a negative error code in | |
1380 | * case of error. | |
1381 | */ | |
1382 | static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp) | |
1383 | { | |
1384 | int i, len; | |
1385 | struct mtd_dev_param *p; | |
1386 | char buf[MTD_PARAM_LEN_MAX]; | |
1387 | char *pbuf = &buf[0]; | |
83ff59a0 | 1388 | char *tokens[MTD_PARAM_MAX_COUNT], *token; |
801c135c | 1389 | |
77c722dd AB |
1390 | if (!val) |
1391 | return -EINVAL; | |
1392 | ||
801c135c | 1393 | if (mtd_devs == UBI_MAX_DEVICES) { |
32608703 TB |
1394 | pr_err("UBI error: too many parameters, max. is %d\n", |
1395 | UBI_MAX_DEVICES); | |
801c135c AB |
1396 | return -EINVAL; |
1397 | } | |
1398 | ||
1399 | len = strnlen(val, MTD_PARAM_LEN_MAX); | |
1400 | if (len == MTD_PARAM_LEN_MAX) { | |
32608703 TB |
1401 | pr_err("UBI error: parameter \"%s\" is too long, max. is %d\n", |
1402 | val, MTD_PARAM_LEN_MAX); | |
801c135c AB |
1403 | return -EINVAL; |
1404 | } | |
1405 | ||
1406 | if (len == 0) { | |
45fc5c81 | 1407 | pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n"); |
801c135c AB |
1408 | return 0; |
1409 | } | |
1410 | ||
1411 | strcpy(buf, val); | |
1412 | ||
1413 | /* Get rid of the final newline */ | |
1414 | if (buf[len - 1] == '\n') | |
503990eb | 1415 | buf[len - 1] = '\0'; |
801c135c | 1416 | |
5993f9b7 | 1417 | for (i = 0; i < MTD_PARAM_MAX_COUNT; i++) |
801c135c AB |
1418 | tokens[i] = strsep(&pbuf, ","); |
1419 | ||
1420 | if (pbuf) { | |
32608703 | 1421 | pr_err("UBI error: too many arguments at \"%s\"\n", val); |
801c135c AB |
1422 | return -EINVAL; |
1423 | } | |
1424 | ||
801c135c AB |
1425 | p = &mtd_dev_param[mtd_devs]; |
1426 | strcpy(&p->name[0], tokens[0]); | |
1427 | ||
83ff59a0 MF |
1428 | token = tokens[1]; |
1429 | if (token) { | |
1430 | p->vid_hdr_offs = bytes_str_to_int(token); | |
801c135c | 1431 | |
83ff59a0 MF |
1432 | if (p->vid_hdr_offs < 0) |
1433 | return p->vid_hdr_offs; | |
1434 | } | |
801c135c | 1435 | |
83ff59a0 MF |
1436 | token = tokens[2]; |
1437 | if (token) { | |
1438 | int err = kstrtoint(token, 10, &p->max_beb_per1024); | |
edac493d RG |
1439 | |
1440 | if (err) { | |
32608703 TB |
1441 | pr_err("UBI error: bad value for max_beb_per1024 parameter: %s", |
1442 | token); | |
edac493d RG |
1443 | return -EINVAL; |
1444 | } | |
1445 | } | |
1446 | ||
83ff59a0 MF |
1447 | token = tokens[3]; |
1448 | if (token) { | |
1449 | int err = kstrtoint(token, 10, &p->ubi_num); | |
1450 | ||
1451 | if (err) { | |
32608703 TB |
1452 | pr_err("UBI error: bad value for ubi_num parameter: %s", |
1453 | token); | |
83ff59a0 MF |
1454 | return -EINVAL; |
1455 | } | |
1456 | } else | |
1457 | p->ubi_num = UBI_DEV_NUM_AUTO; | |
1458 | ||
801c135c AB |
1459 | mtd_devs += 1; |
1460 | return 0; | |
1461 | } | |
1462 | ||
1463 | module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000); | |
83ff59a0 | 1464 | MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024[,ubi_num]]].\n" |
801c135c | 1465 | "Multiple \"mtd\" parameters may be specified.\n" |
edac493d RG |
1466 | "MTD devices may be specified by their number, name, or path to the MTD character device node.\n" |
1467 | "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n" | |
1468 | "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value (" | |
1469 | __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n" | |
83ff59a0 | 1470 | "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 |
1471 | "\n" |
1472 | "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n" | |
1473 | "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" | |
1474 | "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 | 1475 | "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 | 1476 | "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device)."); |
77e6c2f0 RW |
1477 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1478 | module_param(fm_autoconvert, bool, 0644); | |
1479 | MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap."); | |
479c2c0c RW |
1480 | module_param(fm_debug, bool, 0); |
1481 | MODULE_PARM_DESC(fm_debug, "Set this parameter to enable fastmap debugging by default. Warning, this will make fastmap slow!"); | |
77e6c2f0 | 1482 | #endif |
801c135c AB |
1483 | MODULE_VERSION(__stringify(UBI_VERSION)); |
1484 | MODULE_DESCRIPTION("UBI - Unsorted Block Images"); | |
1485 | MODULE_AUTHOR("Artem Bityutskiy"); | |
1486 | MODULE_LICENSE("GPL"); |