Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
801c135c AB |
2 | /* |
3 | * Copyright (c) International Business Machines Corp., 2006 | |
4 | * Copyright (c) Nokia Corporation, 2007 | |
5 | * | |
801c135c AB |
6 | * Author: Artem Bityutskiy (Битюцкий Артём), |
7 | * Frank Haverkamp | |
8 | */ | |
9 | ||
10 | /* | |
9f961b57 AB |
11 | * This file includes UBI initialization and building of UBI devices. |
12 | * | |
13 | * When UBI is initialized, it attaches all the MTD devices specified as the | |
14 | * module load parameters or the kernel boot parameters. If MTD devices were | |
15 | * specified, UBI does not attach any MTD device, but it is possible to do | |
16 | * later using the "UBI control device". | |
801c135c AB |
17 | */ |
18 | ||
19 | #include <linux/err.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/moduleparam.h> | |
22 | #include <linux/stringify.h> | |
f9b0080e | 23 | #include <linux/namei.h> |
801c135c | 24 | #include <linux/stat.h> |
9f961b57 | 25 | #include <linux/miscdevice.h> |
ba4087e9 | 26 | #include <linux/mtd/partitions.h> |
7753f169 | 27 | #include <linux/log2.h> |
cdfa788a | 28 | #include <linux/kthread.h> |
774b1382 | 29 | #include <linux/kernel.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
f83c3838 | 31 | #include <linux/major.h> |
801c135c AB |
32 | #include "ubi.h" |
33 | ||
34 | /* Maximum length of the 'mtd=' parameter */ | |
35 | #define MTD_PARAM_LEN_MAX 64 | |
36 | ||
5993f9b7 | 37 | /* Maximum number of comma-separated items in the 'mtd=' parameter */ |
83ff59a0 | 38 | #define MTD_PARAM_MAX_COUNT 4 |
5993f9b7 | 39 | |
d2f588f9 RG |
40 | /* Maximum value for the number of bad PEBs per 1024 PEBs */ |
41 | #define MAX_MTD_UBI_BEB_LIMIT 768 | |
42 | ||
af7ad7a0 MKB |
43 | #ifdef CONFIG_MTD_UBI_MODULE |
44 | #define ubi_is_module() 1 | |
45 | #else | |
46 | #define ubi_is_module() 0 | |
47 | #endif | |
48 | ||
801c135c AB |
49 | /** |
50 | * struct mtd_dev_param - MTD device parameter description data structure. | |
f9b0080e AB |
51 | * @name: MTD character device node path, MTD device name, or MTD device number |
52 | * string | |
801c135c | 53 | * @vid_hdr_offs: VID header offset |
edac493d | 54 | * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs |
801c135c | 55 | */ |
9c9ec147 | 56 | struct mtd_dev_param { |
801c135c | 57 | char name[MTD_PARAM_LEN_MAX]; |
83ff59a0 | 58 | int ubi_num; |
801c135c | 59 | int vid_hdr_offs; |
edac493d | 60 | int max_beb_per1024; |
801c135c AB |
61 | }; |
62 | ||
63 | /* Numbers of elements set in the @mtd_dev_param array */ | |
435009d4 | 64 | static int mtd_devs; |
801c135c AB |
65 | |
66 | /* MTD devices specification parameters */ | |
435009d4 | 67 | static struct mtd_dev_param mtd_dev_param[UBI_MAX_DEVICES]; |
77e6c2f0 RW |
68 | #ifdef CONFIG_MTD_UBI_FASTMAP |
69 | /* UBI module parameter to enable fastmap automatically on non-fastmap images */ | |
70 | static bool fm_autoconvert; | |
479c2c0c | 71 | static bool fm_debug; |
77e6c2f0 | 72 | #endif |
801c135c | 73 | |
06b68ba1 AB |
74 | /* Slab cache for wear-leveling entries */ |
75 | struct kmem_cache *ubi_wl_entry_slab; | |
76 | ||
9f961b57 AB |
77 | /* UBI control character device */ |
78 | static struct miscdevice ubi_ctrl_cdev = { | |
79 | .minor = MISC_DYNAMIC_MINOR, | |
80 | .name = "ubi_ctrl", | |
81 | .fops = &ubi_ctrl_cdev_operations, | |
82 | }; | |
06b68ba1 | 83 | |
e73f4459 AB |
84 | /* All UBI devices in system */ |
85 | static struct ubi_device *ubi_devices[UBI_MAX_DEVICES]; | |
86 | ||
cdfa788a AB |
87 | /* Serializes UBI devices creations and removals */ |
88 | DEFINE_MUTEX(ubi_devices_mutex); | |
89 | ||
e73f4459 AB |
90 | /* Protects @ubi_devices and @ubi->ref_count */ |
91 | static DEFINE_SPINLOCK(ubi_devices_lock); | |
92 | ||
801c135c | 93 | /* "Show" method for files in '/<sysfs>/class/ubi/' */ |
219eccda GKH |
94 | /* UBI version attribute ('/<sysfs>/class/ubi/version') */ |
95 | static ssize_t version_show(struct class *class, struct class_attribute *attr, | |
96 | char *buf) | |
801c135c AB |
97 | { |
98 | return sprintf(buf, "%d\n", UBI_VERSION); | |
99 | } | |
219eccda | 100 | static CLASS_ATTR_RO(version); |
801c135c | 101 | |
219eccda GKH |
102 | static struct attribute *ubi_class_attrs[] = { |
103 | &class_attr_version.attr, | |
104 | NULL, | |
53cd255c | 105 | }; |
219eccda | 106 | ATTRIBUTE_GROUPS(ubi_class); |
53cd255c TI |
107 | |
108 | /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */ | |
109 | struct class ubi_class = { | |
110 | .name = UBI_NAME_STR, | |
111 | .owner = THIS_MODULE, | |
219eccda | 112 | .class_groups = ubi_class_groups, |
53cd255c | 113 | }; |
801c135c AB |
114 | |
115 | static ssize_t dev_attribute_show(struct device *dev, | |
116 | struct device_attribute *attr, char *buf); | |
117 | ||
118 | /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */ | |
119 | static struct device_attribute dev_eraseblock_size = | |
120 | __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL); | |
121 | static struct device_attribute dev_avail_eraseblocks = | |
122 | __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
123 | static struct device_attribute dev_total_eraseblocks = | |
124 | __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
125 | static struct device_attribute dev_volumes_count = | |
126 | __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL); | |
127 | static struct device_attribute dev_max_ec = | |
128 | __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL); | |
129 | static struct device_attribute dev_reserved_for_bad = | |
130 | __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL); | |
131 | static struct device_attribute dev_bad_peb_count = | |
132 | __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL); | |
133 | static struct device_attribute dev_max_vol_count = | |
134 | __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL); | |
135 | static struct device_attribute dev_min_io_size = | |
136 | __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL); | |
137 | static struct device_attribute dev_bgt_enabled = | |
138 | __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL); | |
b6b76ba4 AB |
139 | static struct device_attribute dev_mtd_num = |
140 | __ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL); | |
525bab71 EG |
141 | static struct device_attribute dev_ro_mode = |
142 | __ATTR(ro_mode, S_IRUGO, dev_attribute_show, NULL); | |
801c135c | 143 | |
0e0ee1cc DP |
144 | /** |
145 | * ubi_volume_notify - send a volume change notification. | |
146 | * @ubi: UBI device description object | |
147 | * @vol: volume description object of the changed volume | |
148 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
149 | * | |
150 | * This is a helper function which notifies all subscribers about a volume | |
151 | * change event (creation, removal, re-sizing, re-naming, updating). Returns | |
152 | * zero in case of success and a negative error code in case of failure. | |
153 | */ | |
154 | int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype) | |
155 | { | |
84b678f4 | 156 | int ret; |
0e0ee1cc DP |
157 | struct ubi_notification nt; |
158 | ||
159 | ubi_do_get_device_info(ubi, &nt.di); | |
160 | ubi_do_get_volume_info(ubi, vol, &nt.vi); | |
77e6c2f0 | 161 | |
77e6c2f0 RW |
162 | switch (ntype) { |
163 | case UBI_VOLUME_ADDED: | |
164 | case UBI_VOLUME_REMOVED: | |
165 | case UBI_VOLUME_RESIZED: | |
166 | case UBI_VOLUME_RENAMED: | |
84b678f4 RW |
167 | ret = ubi_update_fastmap(ubi); |
168 | if (ret) | |
169 | ubi_msg(ubi, "Unable to write a new fastmap: %i", ret); | |
77e6c2f0 | 170 | } |
84b678f4 | 171 | |
0e0ee1cc DP |
172 | return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt); |
173 | } | |
174 | ||
175 | /** | |
176 | * ubi_notify_all - send a notification to all volumes. | |
177 | * @ubi: UBI device description object | |
178 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
179 | * @nb: the notifier to call | |
180 | * | |
181 | * This function walks all volumes of UBI device @ubi and sends the @ntype | |
182 | * notification for each volume. If @nb is %NULL, then all registered notifiers | |
183 | * are called, otherwise only the @nb notifier is called. Returns the number of | |
184 | * sent notifications. | |
185 | */ | |
186 | int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb) | |
187 | { | |
188 | struct ubi_notification nt; | |
189 | int i, count = 0; | |
190 | ||
191 | ubi_do_get_device_info(ubi, &nt.di); | |
192 | ||
193 | mutex_lock(&ubi->device_mutex); | |
194 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
195 | /* | |
196 | * Since the @ubi->device is locked, and we are not going to | |
197 | * change @ubi->volumes, we do not have to lock | |
198 | * @ubi->volumes_lock. | |
199 | */ | |
200 | if (!ubi->volumes[i]) | |
201 | continue; | |
202 | ||
203 | ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi); | |
204 | if (nb) | |
205 | nb->notifier_call(nb, ntype, &nt); | |
206 | else | |
207 | blocking_notifier_call_chain(&ubi_notifiers, ntype, | |
208 | &nt); | |
209 | count += 1; | |
210 | } | |
211 | mutex_unlock(&ubi->device_mutex); | |
212 | ||
213 | return count; | |
214 | } | |
215 | ||
216 | /** | |
217 | * ubi_enumerate_volumes - send "add" notification for all existing volumes. | |
218 | * @nb: the notifier to call | |
219 | * | |
220 | * This function walks all UBI devices and volumes and sends the | |
221 | * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all | |
222 | * registered notifiers are called, otherwise only the @nb notifier is called. | |
223 | * Returns the number of sent notifications. | |
224 | */ | |
225 | int ubi_enumerate_volumes(struct notifier_block *nb) | |
226 | { | |
227 | int i, count = 0; | |
228 | ||
229 | /* | |
230 | * Since the @ubi_devices_mutex is locked, and we are not going to | |
231 | * change @ubi_devices, we do not have to lock @ubi_devices_lock. | |
232 | */ | |
233 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
234 | struct ubi_device *ubi = ubi_devices[i]; | |
235 | ||
236 | if (!ubi) | |
237 | continue; | |
238 | count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb); | |
239 | } | |
240 | ||
241 | return count; | |
242 | } | |
243 | ||
e73f4459 AB |
244 | /** |
245 | * ubi_get_device - get UBI device. | |
246 | * @ubi_num: UBI device number | |
247 | * | |
248 | * This function returns UBI device description object for UBI device number | |
249 | * @ubi_num, or %NULL if the device does not exist. This function increases the | |
250 | * device reference count to prevent removal of the device. In other words, the | |
251 | * device cannot be removed if its reference count is not zero. | |
252 | */ | |
253 | struct ubi_device *ubi_get_device(int ubi_num) | |
254 | { | |
255 | struct ubi_device *ubi; | |
256 | ||
257 | spin_lock(&ubi_devices_lock); | |
258 | ubi = ubi_devices[ubi_num]; | |
259 | if (ubi) { | |
260 | ubi_assert(ubi->ref_count >= 0); | |
261 | ubi->ref_count += 1; | |
262 | get_device(&ubi->dev); | |
263 | } | |
264 | spin_unlock(&ubi_devices_lock); | |
265 | ||
266 | return ubi; | |
267 | } | |
268 | ||
269 | /** | |
270 | * ubi_put_device - drop an UBI device reference. | |
271 | * @ubi: UBI device description object | |
272 | */ | |
273 | void ubi_put_device(struct ubi_device *ubi) | |
274 | { | |
275 | spin_lock(&ubi_devices_lock); | |
276 | ubi->ref_count -= 1; | |
277 | put_device(&ubi->dev); | |
278 | spin_unlock(&ubi_devices_lock); | |
279 | } | |
280 | ||
281 | /** | |
ebaaf1af | 282 | * ubi_get_by_major - get UBI device by character device major number. |
e73f4459 AB |
283 | * @major: major number |
284 | * | |
285 | * This function is similar to 'ubi_get_device()', but it searches the device | |
286 | * by its major number. | |
287 | */ | |
288 | struct ubi_device *ubi_get_by_major(int major) | |
289 | { | |
290 | int i; | |
291 | struct ubi_device *ubi; | |
292 | ||
293 | spin_lock(&ubi_devices_lock); | |
294 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
295 | ubi = ubi_devices[i]; | |
296 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
297 | ubi_assert(ubi->ref_count >= 0); | |
298 | ubi->ref_count += 1; | |
299 | get_device(&ubi->dev); | |
300 | spin_unlock(&ubi_devices_lock); | |
301 | return ubi; | |
302 | } | |
303 | } | |
304 | spin_unlock(&ubi_devices_lock); | |
305 | ||
306 | return NULL; | |
307 | } | |
308 | ||
309 | /** | |
310 | * ubi_major2num - get UBI device number by character device major number. | |
311 | * @major: major number | |
312 | * | |
313 | * This function searches UBI device number object by its major number. If UBI | |
cdfa788a | 314 | * device was not found, this function returns -ENODEV, otherwise the UBI device |
e73f4459 AB |
315 | * number is returned. |
316 | */ | |
317 | int ubi_major2num(int major) | |
318 | { | |
319 | int i, ubi_num = -ENODEV; | |
320 | ||
321 | spin_lock(&ubi_devices_lock); | |
322 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
323 | struct ubi_device *ubi = ubi_devices[i]; | |
324 | ||
325 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
326 | ubi_num = ubi->ubi_num; | |
327 | break; | |
328 | } | |
329 | } | |
330 | spin_unlock(&ubi_devices_lock); | |
331 | ||
332 | return ubi_num; | |
333 | } | |
334 | ||
801c135c AB |
335 | /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */ |
336 | static ssize_t dev_attribute_show(struct device *dev, | |
337 | struct device_attribute *attr, char *buf) | |
338 | { | |
e73f4459 AB |
339 | ssize_t ret; |
340 | struct ubi_device *ubi; | |
801c135c | 341 | |
e73f4459 AB |
342 | /* |
343 | * The below code looks weird, but it actually makes sense. We get the | |
344 | * UBI device reference from the contained 'struct ubi_device'. But it | |
345 | * is unclear if the device was removed or not yet. Indeed, if the | |
346 | * device was removed before we increased its reference count, | |
347 | * 'ubi_get_device()' will return -ENODEV and we fail. | |
348 | * | |
349 | * Remember, 'struct ubi_device' is freed in the release function, so | |
350 | * we still can use 'ubi->ubi_num'. | |
351 | */ | |
801c135c | 352 | ubi = container_of(dev, struct ubi_device, dev); |
e73f4459 AB |
353 | ubi = ubi_get_device(ubi->ubi_num); |
354 | if (!ubi) | |
355 | return -ENODEV; | |
356 | ||
801c135c | 357 | if (attr == &dev_eraseblock_size) |
e73f4459 | 358 | ret = sprintf(buf, "%d\n", ubi->leb_size); |
801c135c | 359 | else if (attr == &dev_avail_eraseblocks) |
e73f4459 | 360 | ret = sprintf(buf, "%d\n", ubi->avail_pebs); |
801c135c | 361 | else if (attr == &dev_total_eraseblocks) |
e73f4459 | 362 | ret = sprintf(buf, "%d\n", ubi->good_peb_count); |
801c135c | 363 | else if (attr == &dev_volumes_count) |
4b3cc340 | 364 | ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT); |
801c135c | 365 | else if (attr == &dev_max_ec) |
e73f4459 | 366 | ret = sprintf(buf, "%d\n", ubi->max_ec); |
801c135c | 367 | else if (attr == &dev_reserved_for_bad) |
e73f4459 | 368 | ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs); |
801c135c | 369 | else if (attr == &dev_bad_peb_count) |
e73f4459 | 370 | ret = sprintf(buf, "%d\n", ubi->bad_peb_count); |
801c135c | 371 | else if (attr == &dev_max_vol_count) |
e73f4459 | 372 | ret = sprintf(buf, "%d\n", ubi->vtbl_slots); |
801c135c | 373 | else if (attr == &dev_min_io_size) |
e73f4459 | 374 | ret = sprintf(buf, "%d\n", ubi->min_io_size); |
801c135c | 375 | else if (attr == &dev_bgt_enabled) |
e73f4459 | 376 | ret = sprintf(buf, "%d\n", ubi->thread_enabled); |
b6b76ba4 AB |
377 | else if (attr == &dev_mtd_num) |
378 | ret = sprintf(buf, "%d\n", ubi->mtd->index); | |
525bab71 EG |
379 | else if (attr == &dev_ro_mode) |
380 | ret = sprintf(buf, "%d\n", ubi->ro_mode); | |
801c135c | 381 | else |
b6b76ba4 | 382 | ret = -EINVAL; |
801c135c | 383 | |
e73f4459 AB |
384 | ubi_put_device(ubi); |
385 | return ret; | |
801c135c AB |
386 | } |
387 | ||
53cd255c TI |
388 | static struct attribute *ubi_dev_attrs[] = { |
389 | &dev_eraseblock_size.attr, | |
390 | &dev_avail_eraseblocks.attr, | |
391 | &dev_total_eraseblocks.attr, | |
392 | &dev_volumes_count.attr, | |
393 | &dev_max_ec.attr, | |
394 | &dev_reserved_for_bad.attr, | |
395 | &dev_bad_peb_count.attr, | |
396 | &dev_max_vol_count.attr, | |
397 | &dev_min_io_size.attr, | |
398 | &dev_bgt_enabled.attr, | |
399 | &dev_mtd_num.attr, | |
525bab71 | 400 | &dev_ro_mode.attr, |
53cd255c TI |
401 | NULL |
402 | }; | |
403 | ATTRIBUTE_GROUPS(ubi_dev); | |
404 | ||
36b477d0 AB |
405 | static void dev_release(struct device *dev) |
406 | { | |
407 | struct ubi_device *ubi = container_of(dev, struct ubi_device, dev); | |
408 | ||
409 | kfree(ubi); | |
410 | } | |
801c135c | 411 | |
801c135c | 412 | /** |
0bf1c439 | 413 | * kill_volumes - destroy all user volumes. |
801c135c AB |
414 | * @ubi: UBI device description object |
415 | */ | |
416 | static void kill_volumes(struct ubi_device *ubi) | |
417 | { | |
418 | int i; | |
419 | ||
420 | for (i = 0; i < ubi->vtbl_slots; i++) | |
421 | if (ubi->volumes[i]) | |
89b96b69 | 422 | ubi_free_volume(ubi, ubi->volumes[i]); |
801c135c AB |
423 | } |
424 | ||
425 | /** | |
426 | * uif_init - initialize user interfaces for an UBI device. | |
427 | * @ubi: UBI device description object | |
0bf1c439 AB |
428 | * |
429 | * This function initializes various user interfaces for an UBI device. If the | |
430 | * initialization fails at an early stage, this function frees all the | |
493cfaea | 431 | * resources it allocated, returns an error. |
801c135c AB |
432 | * |
433 | * This function returns zero in case of success and a negative error code in | |
0bf1c439 | 434 | * case of failure. |
801c135c | 435 | */ |
493cfaea | 436 | static int uif_init(struct ubi_device *ubi) |
801c135c | 437 | { |
8c4c19f1 | 438 | int i, err; |
801c135c AB |
439 | dev_t dev; |
440 | ||
801c135c AB |
441 | sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num); |
442 | ||
443 | /* | |
444 | * Major numbers for the UBI character devices are allocated | |
445 | * dynamically. Major numbers of volume character devices are | |
446 | * equivalent to ones of the corresponding UBI character device. Minor | |
447 | * numbers of UBI character devices are 0, while minor numbers of | |
448 | * volume character devices start from 1. Thus, we allocate one major | |
449 | * number and ubi->vtbl_slots + 1 minor numbers. | |
450 | */ | |
451 | err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name); | |
452 | if (err) { | |
32608703 | 453 | ubi_err(ubi, "cannot register UBI character devices"); |
801c135c AB |
454 | return err; |
455 | } | |
456 | ||
493cfaea LG |
457 | ubi->dev.devt = dev; |
458 | ||
49dfc299 | 459 | ubi_assert(MINOR(dev) == 0); |
801c135c | 460 | cdev_init(&ubi->cdev, &ubi_cdev_operations); |
c8566350 | 461 | dbg_gen("%s major is %u", ubi->ubi_name, MAJOR(dev)); |
801c135c AB |
462 | ubi->cdev.owner = THIS_MODULE; |
463 | ||
493cfaea LG |
464 | dev_set_name(&ubi->dev, UBI_NAME_STR "%d", ubi->ubi_num); |
465 | err = cdev_device_add(&ubi->cdev, &ubi->dev); | |
801c135c | 466 | if (err) |
493cfaea | 467 | goto out_unreg; |
801c135c AB |
468 | |
469 | for (i = 0; i < ubi->vtbl_slots; i++) | |
470 | if (ubi->volumes[i]) { | |
89b96b69 | 471 | err = ubi_add_volume(ubi, ubi->volumes[i]); |
01f7b309 | 472 | if (err) { |
32608703 | 473 | ubi_err(ubi, "cannot add volume %d", i); |
801c135c | 474 | goto out_volumes; |
01f7b309 | 475 | } |
801c135c AB |
476 | } |
477 | ||
478 | return 0; | |
479 | ||
480 | out_volumes: | |
481 | kill_volumes(ubi); | |
493cfaea | 482 | cdev_device_del(&ubi->cdev, &ubi->dev); |
801c135c | 483 | out_unreg: |
49dfc299 | 484 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
32608703 TB |
485 | ubi_err(ubi, "cannot initialize UBI %s, error %d", |
486 | ubi->ubi_name, err); | |
801c135c AB |
487 | return err; |
488 | } | |
489 | ||
490 | /** | |
491 | * uif_close - close user interfaces for an UBI device. | |
492 | * @ubi: UBI device description object | |
505d1caa AB |
493 | * |
494 | * Note, since this function un-registers UBI volume device objects (@vol->dev), | |
495 | * the memory allocated voe the volumes is freed as well (in the release | |
496 | * function). | |
801c135c AB |
497 | */ |
498 | static void uif_close(struct ubi_device *ubi) | |
499 | { | |
500 | kill_volumes(ubi); | |
493cfaea | 501 | cdev_device_del(&ubi->cdev, &ubi->dev); |
49dfc299 | 502 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); |
801c135c AB |
503 | } |
504 | ||
505d1caa | 505 | /** |
47e1ec70 | 506 | * ubi_free_internal_volumes - free internal volumes. |
505d1caa AB |
507 | * @ubi: UBI device description object |
508 | */ | |
47e1ec70 | 509 | void ubi_free_internal_volumes(struct ubi_device *ubi) |
505d1caa AB |
510 | { |
511 | int i; | |
512 | ||
513 | for (i = ubi->vtbl_slots; | |
514 | i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { | |
799dca34 | 515 | ubi_eba_replace_table(ubi->volumes[i], NULL); |
34653fd8 | 516 | ubi_fastmap_destroy_checkmap(ubi->volumes[i]); |
505d1caa AB |
517 | kfree(ubi->volumes[i]); |
518 | } | |
519 | } | |
520 | ||
95e6fb02 RG |
521 | static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024) |
522 | { | |
523 | int limit, device_pebs; | |
524 | uint64_t device_size; | |
525 | ||
c0e860ba JW |
526 | if (!max_beb_per1024) { |
527 | /* | |
528 | * Since max_beb_per1024 has not been set by the user in either | |
529 | * the cmdline or Kconfig, use mtd_max_bad_blocks to set the | |
530 | * limit if it is supported by the device. | |
531 | */ | |
532 | limit = mtd_max_bad_blocks(ubi->mtd, 0, ubi->mtd->size); | |
533 | if (limit < 0) | |
534 | return 0; | |
535 | return limit; | |
536 | } | |
95e6fb02 RG |
537 | |
538 | /* | |
539 | * Here we are using size of the entire flash chip and | |
540 | * not just the MTD partition size because the maximum | |
541 | * number of bad eraseblocks is a percentage of the | |
542 | * whole device and bad eraseblocks are not fairly | |
543 | * distributed over the flash chip. So the worst case | |
544 | * is that all the bad eraseblocks of the chip are in | |
545 | * the MTD partition we are attaching (ubi->mtd). | |
546 | */ | |
547 | device_size = mtd_get_device_size(ubi->mtd); | |
548 | device_pebs = mtd_div_by_eb(device_size, ubi->mtd); | |
549 | limit = mult_frac(device_pebs, max_beb_per1024, 1024); | |
550 | ||
551 | /* Round it up */ | |
552 | if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs) | |
553 | limit += 1; | |
554 | ||
555 | return limit; | |
556 | } | |
557 | ||
801c135c | 558 | /** |
85c6e6e2 | 559 | * io_init - initialize I/O sub-system for a given UBI device. |
801c135c | 560 | * @ubi: UBI device description object |
256334c3 | 561 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
801c135c AB |
562 | * |
563 | * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are | |
564 | * assumed: | |
565 | * o EC header is always at offset zero - this cannot be changed; | |
566 | * o VID header starts just after the EC header at the closest address | |
cdfa788a | 567 | * aligned to @io->hdrs_min_io_size; |
801c135c | 568 | * o data starts just after the VID header at the closest address aligned to |
cdfa788a | 569 | * @io->min_io_size |
801c135c AB |
570 | * |
571 | * This function returns zero in case of success and a negative error code in | |
572 | * case of failure. | |
573 | */ | |
256334c3 | 574 | static int io_init(struct ubi_device *ubi, int max_beb_per1024) |
801c135c | 575 | { |
719bb840 AB |
576 | dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb)); |
577 | dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry)); | |
578 | ||
801c135c AB |
579 | if (ubi->mtd->numeraseregions != 0) { |
580 | /* | |
581 | * Some flashes have several erase regions. Different regions | |
582 | * may have different eraseblock size and other | |
583 | * characteristics. It looks like mostly multi-region flashes | |
584 | * have one "main" region and one or more small regions to | |
585 | * store boot loader code or boot parameters or whatever. I | |
586 | * guess we should just pick the largest region. But this is | |
587 | * not implemented. | |
588 | */ | |
32608703 | 589 | ubi_err(ubi, "multiple regions, not implemented"); |
801c135c AB |
590 | return -EINVAL; |
591 | } | |
592 | ||
dd38fccf | 593 | if (ubi->vid_hdr_offset < 0) |
cdfa788a AB |
594 | return -EINVAL; |
595 | ||
801c135c AB |
596 | /* |
597 | * Note, in this implementation we support MTD devices with 0x7FFFFFFF | |
598 | * physical eraseblocks maximum. | |
599 | */ | |
600 | ||
601 | ubi->peb_size = ubi->mtd->erasesize; | |
69423d99 | 602 | ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd); |
801c135c AB |
603 | ubi->flash_size = ubi->mtd->size; |
604 | ||
8beeb3bb | 605 | if (mtd_can_have_bb(ubi->mtd)) { |
801c135c | 606 | ubi->bad_allowed = 1; |
95e6fb02 | 607 | ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024); |
8beeb3bb | 608 | } |
801c135c | 609 | |
ebf53f42 AB |
610 | if (ubi->mtd->type == MTD_NORFLASH) { |
611 | ubi_assert(ubi->mtd->writesize == 1); | |
612 | ubi->nor_flash = 1; | |
613 | } | |
614 | ||
801c135c AB |
615 | ubi->min_io_size = ubi->mtd->writesize; |
616 | ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; | |
617 | ||
cadb40cc KP |
618 | /* |
619 | * Make sure minimal I/O unit is power of 2. Note, there is no | |
620 | * fundamental reason for this assumption. It is just an optimization | |
621 | * which allows us to avoid costly division operations. | |
622 | */ | |
7753f169 | 623 | if (!is_power_of_2(ubi->min_io_size)) { |
32608703 | 624 | ubi_err(ubi, "min. I/O unit (%d) is not power of 2", |
01f7b309 | 625 | ubi->min_io_size); |
801c135c AB |
626 | return -EINVAL; |
627 | } | |
628 | ||
629 | ubi_assert(ubi->hdrs_min_io_size > 0); | |
630 | ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size); | |
631 | ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0); | |
632 | ||
30b542ef AB |
633 | ubi->max_write_size = ubi->mtd->writebufsize; |
634 | /* | |
635 | * Maximum write size has to be greater or equivalent to min. I/O | |
636 | * size, and be multiple of min. I/O size. | |
637 | */ | |
638 | if (ubi->max_write_size < ubi->min_io_size || | |
639 | ubi->max_write_size % ubi->min_io_size || | |
640 | !is_power_of_2(ubi->max_write_size)) { | |
32608703 | 641 | ubi_err(ubi, "bad write buffer size %d for %d min. I/O unit", |
30b542ef AB |
642 | ubi->max_write_size, ubi->min_io_size); |
643 | return -EINVAL; | |
644 | } | |
645 | ||
801c135c AB |
646 | /* Calculate default aligned sizes of EC and VID headers */ |
647 | ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size); | |
648 | ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size); | |
649 | ||
719bb840 AB |
650 | dbg_gen("min_io_size %d", ubi->min_io_size); |
651 | dbg_gen("max_write_size %d", ubi->max_write_size); | |
652 | dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size); | |
653 | dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize); | |
654 | dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize); | |
801c135c AB |
655 | |
656 | if (ubi->vid_hdr_offset == 0) | |
657 | /* Default offset */ | |
658 | ubi->vid_hdr_offset = ubi->vid_hdr_aloffset = | |
659 | ubi->ec_hdr_alsize; | |
660 | else { | |
661 | ubi->vid_hdr_aloffset = ubi->vid_hdr_offset & | |
662 | ~(ubi->hdrs_min_io_size - 1); | |
663 | ubi->vid_hdr_shift = ubi->vid_hdr_offset - | |
664 | ubi->vid_hdr_aloffset; | |
665 | } | |
666 | ||
667 | /* Similar for the data offset */ | |
e8cfe009 | 668 | ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE; |
dd38fccf | 669 | ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size); |
801c135c | 670 | |
719bb840 AB |
671 | dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset); |
672 | dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset); | |
673 | dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift); | |
674 | dbg_gen("leb_start %d", ubi->leb_start); | |
801c135c AB |
675 | |
676 | /* The shift must be aligned to 32-bit boundary */ | |
677 | if (ubi->vid_hdr_shift % 4) { | |
32608703 | 678 | ubi_err(ubi, "unaligned VID header shift %d", |
801c135c AB |
679 | ubi->vid_hdr_shift); |
680 | return -EINVAL; | |
681 | } | |
682 | ||
683 | /* Check sanity */ | |
684 | if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE || | |
685 | ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE || | |
686 | ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE || | |
cadb40cc | 687 | ubi->leb_start & (ubi->min_io_size - 1)) { |
32608703 | 688 | ubi_err(ubi, "bad VID header (%d) or data offsets (%d)", |
801c135c AB |
689 | ubi->vid_hdr_offset, ubi->leb_start); |
690 | return -EINVAL; | |
691 | } | |
692 | ||
b86a2c56 AB |
693 | /* |
694 | * Set maximum amount of physical erroneous eraseblocks to be 10%. | |
695 | * Erroneous PEB are those which have read errors. | |
696 | */ | |
697 | ubi->max_erroneous = ubi->peb_count / 10; | |
698 | if (ubi->max_erroneous < 16) | |
699 | ubi->max_erroneous = 16; | |
719bb840 | 700 | dbg_gen("max_erroneous %d", ubi->max_erroneous); |
b86a2c56 | 701 | |
801c135c AB |
702 | /* |
703 | * It may happen that EC and VID headers are situated in one minimal | |
704 | * I/O unit. In this case we can only accept this UBI image in | |
705 | * read-only mode. | |
706 | */ | |
707 | if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) { | |
32608703 | 708 | ubi_warn(ubi, "EC and VID headers are in the same minimal I/O unit, switch to read-only mode"); |
801c135c AB |
709 | ubi->ro_mode = 1; |
710 | } | |
711 | ||
712 | ubi->leb_size = ubi->peb_size - ubi->leb_start; | |
713 | ||
714 | if (!(ubi->mtd->flags & MTD_WRITEABLE)) { | |
32608703 | 715 | ubi_msg(ubi, "MTD device %d is write-protected, attach in read-only mode", |
049333ce | 716 | ubi->mtd->index); |
801c135c AB |
717 | ubi->ro_mode = 1; |
718 | } | |
719 | ||
801c135c | 720 | /* |
fbd0107f | 721 | * Note, ideally, we have to initialize @ubi->bad_peb_count here. But |
801c135c AB |
722 | * unfortunately, MTD does not provide this information. We should loop |
723 | * over all physical eraseblocks and invoke mtd->block_is_bad() for | |
fbd0107f AB |
724 | * each physical eraseblock. So, we leave @ubi->bad_peb_count |
725 | * uninitialized so far. | |
801c135c AB |
726 | */ |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
4ccf8cff AB |
731 | /** |
732 | * autoresize - re-size the volume which has the "auto-resize" flag set. | |
733 | * @ubi: UBI device description object | |
734 | * @vol_id: ID of the volume to re-size | |
735 | * | |
fbd0107f | 736 | * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in |
4ccf8cff AB |
737 | * the volume table to the largest possible size. See comments in ubi-header.h |
738 | * for more description of the flag. Returns zero in case of success and a | |
739 | * negative error code in case of failure. | |
740 | */ | |
741 | static int autoresize(struct ubi_device *ubi, int vol_id) | |
742 | { | |
743 | struct ubi_volume_desc desc; | |
744 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
745 | int err, old_reserved_pebs = vol->reserved_pebs; | |
746 | ||
abb3e011 | 747 | if (ubi->ro_mode) { |
32608703 | 748 | ubi_warn(ubi, "skip auto-resize because of R/O mode"); |
abb3e011 AB |
749 | return 0; |
750 | } | |
751 | ||
4ccf8cff AB |
752 | /* |
753 | * Clear the auto-resize flag in the volume in-memory copy of the | |
505d1caa | 754 | * volume table, and 'ubi_resize_volume()' will propagate this change |
4ccf8cff AB |
755 | * to the flash. |
756 | */ | |
757 | ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG; | |
758 | ||
759 | if (ubi->avail_pebs == 0) { | |
760 | struct ubi_vtbl_record vtbl_rec; | |
761 | ||
762 | /* | |
505d1caa | 763 | * No available PEBs to re-size the volume, clear the flag on |
4ccf8cff AB |
764 | * flash and exit. |
765 | */ | |
d856c13c | 766 | vtbl_rec = ubi->vtbl[vol_id]; |
4ccf8cff AB |
767 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
768 | if (err) | |
32608703 | 769 | ubi_err(ubi, "cannot clean auto-resize flag for volume %d", |
4ccf8cff AB |
770 | vol_id); |
771 | } else { | |
772 | desc.vol = vol; | |
773 | err = ubi_resize_volume(&desc, | |
774 | old_reserved_pebs + ubi->avail_pebs); | |
775 | if (err) | |
32608703 TB |
776 | ubi_err(ubi, "cannot auto-resize volume %d", |
777 | vol_id); | |
4ccf8cff AB |
778 | } |
779 | ||
780 | if (err) | |
781 | return err; | |
782 | ||
32608703 TB |
783 | ubi_msg(ubi, "volume %d (\"%s\") re-sized from %d to %d LEBs", |
784 | vol_id, vol->name, old_reserved_pebs, vol->reserved_pebs); | |
4ccf8cff AB |
785 | return 0; |
786 | } | |
787 | ||
801c135c | 788 | /** |
cdfa788a | 789 | * ubi_attach_mtd_dev - attach an MTD device. |
ebaaf1af | 790 | * @mtd: MTD device description object |
897a316c | 791 | * @ubi_num: number to assign to the new UBI device |
801c135c | 792 | * @vid_hdr_offset: VID header offset |
edac493d | 793 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
801c135c | 794 | * |
897a316c AB |
795 | * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number |
796 | * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in | |
505d1caa | 797 | * which case this function finds a vacant device number and assigns it |
897a316c AB |
798 | * automatically. Returns the new UBI device number in case of success and a |
799 | * negative error code in case of failure. | |
cdfa788a AB |
800 | * |
801 | * Note, the invocations of this function has to be serialized by the | |
802 | * @ubi_devices_mutex. | |
801c135c | 803 | */ |
256334c3 RG |
804 | int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, |
805 | int vid_hdr_offset, int max_beb_per1024) | |
801c135c AB |
806 | { |
807 | struct ubi_device *ubi; | |
493cfaea | 808 | int i, err; |
801c135c | 809 | |
d2f588f9 RG |
810 | if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT) |
811 | return -EINVAL; | |
812 | ||
813 | if (!max_beb_per1024) | |
814 | max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT; | |
815 | ||
cdfa788a AB |
816 | /* |
817 | * Check if we already have the same MTD device attached. | |
818 | * | |
819 | * Note, this function assumes that UBI devices creations and deletions | |
820 | * are serialized, so it does not take the &ubi_devices_lock. | |
821 | */ | |
897a316c | 822 | for (i = 0; i < UBI_MAX_DEVICES; i++) { |
b96bf4c3 | 823 | ubi = ubi_devices[i]; |
cdfa788a | 824 | if (ubi && mtd->index == ubi->mtd->index) { |
a51b7ccf | 825 | pr_err("ubi: mtd%d is already attached to ubi%d\n", |
801c135c | 826 | mtd->index, i); |
897a316c | 827 | return -EEXIST; |
801c135c | 828 | } |
897a316c | 829 | } |
801c135c | 830 | |
897a316c AB |
831 | /* |
832 | * Make sure this MTD device is not emulated on top of an UBI volume | |
833 | * already. Well, generally this recursion works fine, but there are | |
834 | * different problems like the UBI module takes a reference to itself | |
835 | * by attaching (and thus, opening) the emulated MTD device. This | |
836 | * results in inability to unload the module. And in general it makes | |
837 | * no sense to attach emulated MTD devices, so we prohibit this. | |
838 | */ | |
839 | if (mtd->type == MTD_UBIVOLUME) { | |
a51b7ccf | 840 | pr_err("ubi: refuse attaching mtd%d - it is already emulated on top of UBI\n", |
049333ce | 841 | mtd->index); |
897a316c AB |
842 | return -EINVAL; |
843 | } | |
844 | ||
b5094b7f RW |
845 | /* |
846 | * Both UBI and UBIFS have been designed for SLC NAND and NOR flashes. | |
847 | * MLC NAND is different and needs special care, otherwise UBI or UBIFS | |
848 | * will die soon and you will lose all your data. | |
849 | */ | |
850 | if (mtd->type == MTD_MLCNANDFLASH) { | |
851 | pr_err("ubi: refuse attaching mtd%d - MLC NAND is not supported\n", | |
852 | mtd->index); | |
853 | return -EINVAL; | |
854 | } | |
855 | ||
897a316c AB |
856 | if (ubi_num == UBI_DEV_NUM_AUTO) { |
857 | /* Search for an empty slot in the @ubi_devices array */ | |
858 | for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) | |
859 | if (!ubi_devices[ubi_num]) | |
860 | break; | |
861 | if (ubi_num == UBI_MAX_DEVICES) { | |
a51b7ccf | 862 | pr_err("ubi: only %d UBI devices may be created\n", |
9c9ec147 | 863 | UBI_MAX_DEVICES); |
897a316c AB |
864 | return -ENFILE; |
865 | } | |
866 | } else { | |
867 | if (ubi_num >= UBI_MAX_DEVICES) | |
868 | return -EINVAL; | |
b96bf4c3 | 869 | |
897a316c AB |
870 | /* Make sure ubi_num is not busy */ |
871 | if (ubi_devices[ubi_num]) { | |
a51b7ccf | 872 | pr_err("ubi: ubi%i already exists\n", ubi_num); |
897a316c AB |
873 | return -EEXIST; |
874 | } | |
b96bf4c3 AB |
875 | } |
876 | ||
cdfa788a AB |
877 | ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL); |
878 | if (!ubi) | |
879 | return -ENOMEM; | |
801c135c | 880 | |
493cfaea LG |
881 | device_initialize(&ubi->dev); |
882 | ubi->dev.release = dev_release; | |
883 | ubi->dev.class = &ubi_class; | |
884 | ubi->dev.groups = ubi_dev_groups; | |
885 | ||
cdfa788a | 886 | ubi->mtd = mtd; |
897a316c | 887 | ubi->ubi_num = ubi_num; |
801c135c | 888 | ubi->vid_hdr_offset = vid_hdr_offset; |
4ccf8cff AB |
889 | ubi->autoresize_vol_id = -1; |
890 | ||
77e6c2f0 RW |
891 | #ifdef CONFIG_MTD_UBI_FASTMAP |
892 | ubi->fm_pool.used = ubi->fm_pool.size = 0; | |
893 | ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0; | |
894 | ||
895 | /* | |
896 | * fm_pool.max_size is 5% of the total number of PEBs but it's also | |
897 | * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE. | |
898 | */ | |
899 | ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size, | |
900 | ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE); | |
212240df | 901 | ubi->fm_pool.max_size = max(ubi->fm_pool.max_size, |
902 | UBI_FM_MIN_POOL_SIZE); | |
77e6c2f0 | 903 | |
68e3226b | 904 | ubi->fm_wl_pool.max_size = ubi->fm_pool.max_size / 2; |
77e6c2f0 | 905 | ubi->fm_disabled = !fm_autoconvert; |
479c2c0c RW |
906 | if (fm_debug) |
907 | ubi_enable_dbg_chk_fastmap(ubi); | |
77e6c2f0 RW |
908 | |
909 | if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) | |
910 | <= UBI_FM_MAX_START) { | |
32608703 | 911 | ubi_err(ubi, "More than %i PEBs are needed for fastmap, sorry.", |
77e6c2f0 RW |
912 | UBI_FM_MAX_START); |
913 | ubi->fm_disabled = 1; | |
914 | } | |
915 | ||
32608703 TB |
916 | ubi_msg(ubi, "default fastmap pool size: %d", ubi->fm_pool.max_size); |
917 | ubi_msg(ubi, "default fastmap WL pool size: %d", | |
918 | ubi->fm_wl_pool.max_size); | |
77e6c2f0 RW |
919 | #else |
920 | ubi->fm_disabled = 1; | |
921 | #endif | |
4ccf8cff AB |
922 | mutex_init(&ubi->buf_mutex); |
923 | mutex_init(&ubi->ckvol_mutex); | |
f089c0b2 | 924 | mutex_init(&ubi->device_mutex); |
4ccf8cff | 925 | spin_lock_init(&ubi->volumes_lock); |
111ab0b2 RW |
926 | init_rwsem(&ubi->fm_protect); |
927 | init_rwsem(&ubi->fm_eba_sem); | |
cdfa788a | 928 | |
45fc5c81 | 929 | ubi_msg(ubi, "attaching mtd%d", mtd->index); |
cdfa788a | 930 | |
256334c3 | 931 | err = io_init(ubi, max_beb_per1024); |
801c135c AB |
932 | if (err) |
933 | goto out_free; | |
934 | ||
ad5942ba | 935 | err = -ENOMEM; |
0ca39d74 AB |
936 | ubi->peb_buf = vmalloc(ubi->peb_size); |
937 | if (!ubi->peb_buf) | |
e88d6e10 AB |
938 | goto out_free; |
939 | ||
77e6c2f0 RW |
940 | #ifdef CONFIG_MTD_UBI_FASTMAP |
941 | ubi->fm_size = ubi_calc_fm_size(ubi); | |
942 | ubi->fm_buf = vzalloc(ubi->fm_size); | |
943 | if (!ubi->fm_buf) | |
944 | goto out_free; | |
945 | #endif | |
dac6e208 | 946 | err = ubi_attach(ubi, 0); |
801c135c | 947 | if (err) { |
32608703 TB |
948 | ubi_err(ubi, "failed to attach mtd%d, error %d", |
949 | mtd->index, err); | |
eab73772 | 950 | goto out_free; |
801c135c AB |
951 | } |
952 | ||
4ccf8cff AB |
953 | if (ubi->autoresize_vol_id != -1) { |
954 | err = autoresize(ubi, ubi->autoresize_vol_id); | |
955 | if (err) | |
956 | goto out_detach; | |
957 | } | |
958 | ||
714fb87e IH |
959 | /* Make device "available" before it becomes accessible via sysfs */ |
960 | ubi_devices[ubi_num] = ubi; | |
961 | ||
493cfaea | 962 | err = uif_init(ubi); |
801c135c | 963 | if (err) |
0bf1c439 | 964 | goto out_detach; |
801c135c | 965 | |
2a734bb8 AB |
966 | err = ubi_debugfs_init_dev(ubi); |
967 | if (err) | |
968 | goto out_uif; | |
969 | ||
f170168b | 970 | ubi->bgt_thread = kthread_create(ubi_thread, ubi, "%s", ubi->bgt_name); |
cdfa788a AB |
971 | if (IS_ERR(ubi->bgt_thread)) { |
972 | err = PTR_ERR(ubi->bgt_thread); | |
32608703 TB |
973 | ubi_err(ubi, "cannot spawn \"%s\", error %d", |
974 | ubi->bgt_name, err); | |
2a734bb8 | 975 | goto out_debugfs; |
cdfa788a AB |
976 | } |
977 | ||
32608703 TB |
978 | ubi_msg(ubi, "attached mtd%d (name \"%s\", size %llu MiB)", |
979 | mtd->index, mtd->name, ubi->flash_size >> 20); | |
980 | ubi_msg(ubi, "PEB size: %d bytes (%d KiB), LEB size: %d bytes", | |
719bb840 | 981 | ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size); |
32608703 | 982 | ubi_msg(ubi, "min./max. I/O unit sizes: %d/%d, sub-page size %d", |
719bb840 | 983 | ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size); |
32608703 | 984 | ubi_msg(ubi, "VID header offset: %d (aligned %d), data offset: %d", |
719bb840 | 985 | ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start); |
32608703 | 986 | ubi_msg(ubi, "good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d", |
719bb840 | 987 | ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count); |
32608703 | 988 | ubi_msg(ubi, "user volume: %d, internal volumes: %d, max. volumes count: %d", |
719bb840 AB |
989 | ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT, |
990 | ubi->vtbl_slots); | |
32608703 | 991 | ubi_msg(ubi, "max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u", |
719bb840 AB |
992 | ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD, |
993 | ubi->image_seq); | |
32608703 | 994 | ubi_msg(ubi, "available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d", |
719bb840 | 995 | ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs); |
801c135c | 996 | |
ddbd3b61 AB |
997 | /* |
998 | * The below lock makes sure we do not race with 'ubi_thread()' which | |
999 | * checks @ubi->thread_enabled. Otherwise we may fail to wake it up. | |
1000 | */ | |
1001 | spin_lock(&ubi->wl_lock); | |
28237e45 | 1002 | ubi->thread_enabled = 1; |
d37e6bf6 | 1003 | wake_up_process(ubi->bgt_thread); |
ddbd3b61 | 1004 | spin_unlock(&ubi->wl_lock); |
801c135c | 1005 | |
0e0ee1cc | 1006 | ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL); |
897a316c | 1007 | return ubi_num; |
801c135c | 1008 | |
2a734bb8 AB |
1009 | out_debugfs: |
1010 | ubi_debugfs_exit_dev(ubi); | |
cdfa788a AB |
1011 | out_uif: |
1012 | uif_close(ubi); | |
801c135c | 1013 | out_detach: |
714fb87e | 1014 | ubi_devices[ubi_num] = NULL; |
801c135c | 1015 | ubi_wl_close(ubi); |
47e1ec70 | 1016 | ubi_free_internal_volumes(ubi); |
d7f0c4dc | 1017 | vfree(ubi->vtbl); |
801c135c | 1018 | out_free: |
0ca39d74 | 1019 | vfree(ubi->peb_buf); |
77e6c2f0 | 1020 | vfree(ubi->fm_buf); |
493cfaea | 1021 | put_device(&ubi->dev); |
801c135c AB |
1022 | return err; |
1023 | } | |
1024 | ||
1025 | /** | |
cdfa788a AB |
1026 | * ubi_detach_mtd_dev - detach an MTD device. |
1027 | * @ubi_num: UBI device number to detach from | |
1028 | * @anyway: detach MTD even if device reference count is not zero | |
1029 | * | |
1030 | * This function destroys an UBI device number @ubi_num and detaches the | |
1031 | * underlying MTD device. Returns zero in case of success and %-EBUSY if the | |
1032 | * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not | |
1033 | * exist. | |
1034 | * | |
1035 | * Note, the invocations of this function has to be serialized by the | |
1036 | * @ubi_devices_mutex. | |
801c135c | 1037 | */ |
cdfa788a | 1038 | int ubi_detach_mtd_dev(int ubi_num, int anyway) |
801c135c | 1039 | { |
cdfa788a AB |
1040 | struct ubi_device *ubi; |
1041 | ||
1042 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
1043 | return -EINVAL; | |
1044 | ||
0e0ee1cc DP |
1045 | ubi = ubi_get_device(ubi_num); |
1046 | if (!ubi) | |
cdfa788a | 1047 | return -EINVAL; |
cdfa788a | 1048 | |
0e0ee1cc DP |
1049 | spin_lock(&ubi_devices_lock); |
1050 | put_device(&ubi->dev); | |
1051 | ubi->ref_count -= 1; | |
cdfa788a AB |
1052 | if (ubi->ref_count) { |
1053 | if (!anyway) { | |
897a316c | 1054 | spin_unlock(&ubi_devices_lock); |
cdfa788a AB |
1055 | return -EBUSY; |
1056 | } | |
1057 | /* This may only happen if there is a bug */ | |
32608703 | 1058 | ubi_err(ubi, "%s reference count %d, destroy anyway", |
cdfa788a AB |
1059 | ubi->ubi_name, ubi->ref_count); |
1060 | } | |
897a316c | 1061 | ubi_devices[ubi_num] = NULL; |
cdfa788a AB |
1062 | spin_unlock(&ubi_devices_lock); |
1063 | ||
897a316c | 1064 | ubi_assert(ubi_num == ubi->ubi_num); |
0e0ee1cc | 1065 | ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL); |
32608703 | 1066 | ubi_msg(ubi, "detaching mtd%d", ubi->mtd->index); |
77e6c2f0 RW |
1067 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1068 | /* If we don't write a new fastmap at detach time we lose all | |
24b7a347 RW |
1069 | * EC updates that have been made since the last written fastmap. |
1070 | * In case of fastmap debugging we omit the update to simulate an | |
1071 | * unclean shutdown. */ | |
1072 | if (!ubi_dbg_chk_fastmap(ubi)) | |
1073 | ubi_update_fastmap(ubi); | |
77e6c2f0 | 1074 | #endif |
cdfa788a AB |
1075 | /* |
1076 | * Before freeing anything, we have to stop the background thread to | |
1077 | * prevent it from doing anything on this device while we are freeing. | |
1078 | */ | |
1079 | if (ubi->bgt_thread) | |
1080 | kthread_stop(ubi->bgt_thread); | |
801c135c | 1081 | |
6e7d8016 RW |
1082 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1083 | cancel_work_sync(&ubi->fm_work); | |
1084 | #endif | |
2a734bb8 | 1085 | ubi_debugfs_exit_dev(ubi); |
801c135c | 1086 | uif_close(ubi); |
77e6c2f0 | 1087 | |
801c135c | 1088 | ubi_wl_close(ubi); |
47e1ec70 | 1089 | ubi_free_internal_volumes(ubi); |
92ad8f37 | 1090 | vfree(ubi->vtbl); |
0ca39d74 | 1091 | vfree(ubi->peb_buf); |
77e6c2f0 | 1092 | vfree(ubi->fm_buf); |
32608703 | 1093 | ubi_msg(ubi, "mtd%d is detached", ubi->mtd->index); |
b95f83ab | 1094 | put_mtd_device(ubi->mtd); |
36b477d0 | 1095 | put_device(&ubi->dev); |
cdfa788a | 1096 | return 0; |
801c135c AB |
1097 | } |
1098 | ||
cdfa788a | 1099 | /** |
f9b0080e AB |
1100 | * open_mtd_by_chdev - open an MTD device by its character device node path. |
1101 | * @mtd_dev: MTD character device node path | |
1102 | * | |
1103 | * This helper function opens an MTD device by its character node device path. | |
1104 | * Returns MTD device description object in case of success and a negative | |
1105 | * error code in case of failure. | |
1106 | */ | |
1107 | static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev) | |
1108 | { | |
61edc3f3 | 1109 | int err, minor; |
1a498ec4 | 1110 | struct path path; |
61edc3f3 | 1111 | struct kstat stat; |
f9b0080e AB |
1112 | |
1113 | /* Probably this is an MTD character device node path */ | |
1a498ec4 | 1114 | err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path); |
f9b0080e AB |
1115 | if (err) |
1116 | return ERR_PTR(err); | |
1117 | ||
a528d35e | 1118 | err = vfs_getattr(&path, &stat, STATX_TYPE, AT_STATX_SYNC_AS_STAT); |
1a498ec4 | 1119 | path_put(&path); |
61edc3f3 RW |
1120 | if (err) |
1121 | return ERR_PTR(err); | |
1122 | ||
1123 | /* MTD device number is defined by the major / minor numbers */ | |
1124 | if (MAJOR(stat.rdev) != MTD_CHAR_MAJOR || !S_ISCHR(stat.mode)) | |
f9b0080e AB |
1125 | return ERR_PTR(-EINVAL); |
1126 | ||
61edc3f3 RW |
1127 | minor = MINOR(stat.rdev); |
1128 | ||
f9b0080e AB |
1129 | if (minor & 1) |
1130 | /* | |
1131 | * Just do not think the "/dev/mtdrX" devices support is need, | |
1132 | * so do not support them to avoid doing extra work. | |
1133 | */ | |
1134 | return ERR_PTR(-EINVAL); | |
1135 | ||
1136 | return get_mtd_device(NULL, minor / 2); | |
1137 | } | |
1138 | ||
1139 | /** | |
1140 | * open_mtd_device - open MTD device by name, character device path, or number. | |
1141 | * @mtd_dev: name, character device node path, or MTD device device number | |
cdfa788a | 1142 | * |
d1f3dd6c | 1143 | * This function tries to open and MTD device described by @mtd_dev string, |
f9b0080e AB |
1144 | * which is first treated as ASCII MTD device number, and if it is not true, it |
1145 | * is treated as MTD device name, and if that is also not true, it is treated | |
1146 | * as MTD character device node path. Returns MTD device description object in | |
1147 | * case of success and a negative error code in case of failure. | |
cdfa788a AB |
1148 | */ |
1149 | static struct mtd_info * __init open_mtd_device(const char *mtd_dev) | |
1150 | { | |
1151 | struct mtd_info *mtd; | |
d1f3dd6c AB |
1152 | int mtd_num; |
1153 | char *endp; | |
cdfa788a | 1154 | |
d1f3dd6c AB |
1155 | mtd_num = simple_strtoul(mtd_dev, &endp, 0); |
1156 | if (*endp != '\0' || mtd_dev == endp) { | |
cdfa788a | 1157 | /* |
d1f3dd6c AB |
1158 | * This does not look like an ASCII integer, probably this is |
1159 | * MTD device name. | |
cdfa788a | 1160 | */ |
d1f3dd6c | 1161 | mtd = get_mtd_device_nm(mtd_dev); |
f9b0080e AB |
1162 | if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV) |
1163 | /* Probably this is an MTD character device node path */ | |
1164 | mtd = open_mtd_by_chdev(mtd_dev); | |
d1f3dd6c | 1165 | } else |
cdfa788a | 1166 | mtd = get_mtd_device(NULL, mtd_num); |
cdfa788a AB |
1167 | |
1168 | return mtd; | |
1169 | } | |
1170 | ||
801c135c AB |
1171 | static int __init ubi_init(void) |
1172 | { | |
1173 | int err, i, k; | |
1174 | ||
1175 | /* Ensure that EC and VID headers have correct size */ | |
1176 | BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64); | |
1177 | BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64); | |
1178 | ||
1179 | if (mtd_devs > UBI_MAX_DEVICES) { | |
278f31a7 | 1180 | pr_err("UBI error: too many MTD devices, maximum is %d\n", |
32608703 | 1181 | UBI_MAX_DEVICES); |
801c135c AB |
1182 | return -EINVAL; |
1183 | } | |
1184 | ||
9f961b57 | 1185 | /* Create base sysfs directory and sysfs files */ |
53cd255c TI |
1186 | err = class_register(&ubi_class); |
1187 | if (err < 0) | |
1188 | return err; | |
9f961b57 AB |
1189 | |
1190 | err = misc_register(&ubi_ctrl_cdev); | |
1191 | if (err) { | |
278f31a7 | 1192 | pr_err("UBI error: cannot register device\n"); |
53cd255c | 1193 | goto out; |
9f961b57 | 1194 | } |
801c135c | 1195 | |
06b68ba1 | 1196 | ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab", |
c4506092 AB |
1197 | sizeof(struct ubi_wl_entry), |
1198 | 0, 0, NULL); | |
4d525145 JL |
1199 | if (!ubi_wl_entry_slab) { |
1200 | err = -ENOMEM; | |
b9a06623 | 1201 | goto out_dev_unreg; |
4d525145 | 1202 | } |
06b68ba1 | 1203 | |
2a734bb8 AB |
1204 | err = ubi_debugfs_init(); |
1205 | if (err) | |
1206 | goto out_slab; | |
1207 | ||
1208 | ||
801c135c AB |
1209 | /* Attach MTD devices */ |
1210 | for (i = 0; i < mtd_devs; i++) { | |
1211 | struct mtd_dev_param *p = &mtd_dev_param[i]; | |
cdfa788a | 1212 | struct mtd_info *mtd; |
801c135c AB |
1213 | |
1214 | cond_resched(); | |
cdfa788a AB |
1215 | |
1216 | mtd = open_mtd_device(p->name); | |
1217 | if (IS_ERR(mtd)) { | |
1218 | err = PTR_ERR(mtd); | |
278f31a7 | 1219 | pr_err("UBI error: cannot open mtd %s, error %d\n", |
32608703 | 1220 | p->name, err); |
1557b9e1 MF |
1221 | /* See comment below re-ubi_is_module(). */ |
1222 | if (ubi_is_module()) | |
1223 | goto out_detach; | |
1224 | continue; | |
cdfa788a AB |
1225 | } |
1226 | ||
1227 | mutex_lock(&ubi_devices_mutex); | |
83ff59a0 | 1228 | err = ubi_attach_mtd_dev(mtd, p->ubi_num, |
edac493d | 1229 | p->vid_hdr_offs, p->max_beb_per1024); |
cdfa788a AB |
1230 | mutex_unlock(&ubi_devices_mutex); |
1231 | if (err < 0) { | |
278f31a7 | 1232 | pr_err("UBI error: cannot attach mtd%d\n", |
32608703 | 1233 | mtd->index); |
af7ad7a0 MKB |
1234 | put_mtd_device(mtd); |
1235 | ||
1236 | /* | |
1237 | * Originally UBI stopped initializing on any error. | |
1238 | * However, later on it was found out that this | |
1239 | * behavior is not very good when UBI is compiled into | |
1240 | * the kernel and the MTD devices to attach are passed | |
1241 | * through the command line. Indeed, UBI failure | |
1242 | * stopped whole boot sequence. | |
1243 | * | |
1244 | * To fix this, we changed the behavior for the | |
1245 | * non-module case, but preserved the old behavior for | |
1246 | * the module case, just for compatibility. This is a | |
1247 | * little inconsistent, though. | |
1248 | */ | |
1249 | if (ubi_is_module()) | |
1250 | goto out_detach; | |
9f961b57 | 1251 | } |
801c135c AB |
1252 | } |
1253 | ||
9d54c8a3 EG |
1254 | err = ubiblock_init(); |
1255 | if (err) { | |
278f31a7 | 1256 | pr_err("UBI error: block: cannot initialize, error %d\n", err); |
9d54c8a3 EG |
1257 | |
1258 | /* See comment above re-ubi_is_module(). */ | |
1259 | if (ubi_is_module()) | |
1260 | goto out_detach; | |
1261 | } | |
1262 | ||
801c135c AB |
1263 | return 0; |
1264 | ||
1265 | out_detach: | |
1266 | for (k = 0; k < i; k++) | |
cdfa788a AB |
1267 | if (ubi_devices[k]) { |
1268 | mutex_lock(&ubi_devices_mutex); | |
1269 | ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1); | |
1270 | mutex_unlock(&ubi_devices_mutex); | |
1271 | } | |
2a734bb8 AB |
1272 | ubi_debugfs_exit(); |
1273 | out_slab: | |
06b68ba1 | 1274 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 AB |
1275 | out_dev_unreg: |
1276 | misc_deregister(&ubi_ctrl_cdev); | |
9f961b57 | 1277 | out: |
53cd255c | 1278 | class_unregister(&ubi_class); |
278f31a7 | 1279 | pr_err("UBI error: cannot initialize UBI, error %d\n", err); |
801c135c AB |
1280 | return err; |
1281 | } | |
cf38aca5 | 1282 | late_initcall(ubi_init); |
801c135c AB |
1283 | |
1284 | static void __exit ubi_exit(void) | |
1285 | { | |
b96bf4c3 | 1286 | int i; |
801c135c | 1287 | |
9d54c8a3 EG |
1288 | ubiblock_exit(); |
1289 | ||
b96bf4c3 | 1290 | for (i = 0; i < UBI_MAX_DEVICES; i++) |
cdfa788a AB |
1291 | if (ubi_devices[i]) { |
1292 | mutex_lock(&ubi_devices_mutex); | |
1293 | ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1); | |
1294 | mutex_unlock(&ubi_devices_mutex); | |
1295 | } | |
2a734bb8 | 1296 | ubi_debugfs_exit(); |
06b68ba1 | 1297 | kmem_cache_destroy(ubi_wl_entry_slab); |
9f961b57 | 1298 | misc_deregister(&ubi_ctrl_cdev); |
53cd255c | 1299 | class_unregister(&ubi_class); |
801c135c AB |
1300 | } |
1301 | module_exit(ubi_exit); | |
1302 | ||
1303 | /** | |
ebaaf1af | 1304 | * bytes_str_to_int - convert a number of bytes string into an integer. |
801c135c AB |
1305 | * @str: the string to convert |
1306 | * | |
1307 | * This function returns positive resulting integer in case of success and a | |
1308 | * negative error code in case of failure. | |
1309 | */ | |
435009d4 | 1310 | static int bytes_str_to_int(const char *str) |
801c135c AB |
1311 | { |
1312 | char *endp; | |
1313 | unsigned long result; | |
1314 | ||
1315 | result = simple_strtoul(str, &endp, 0); | |
774b1382 | 1316 | if (str == endp || result >= INT_MAX) { |
32608703 | 1317 | pr_err("UBI error: incorrect bytes count: \"%s\"\n", str); |
801c135c AB |
1318 | return -EINVAL; |
1319 | } | |
1320 | ||
1321 | switch (*endp) { | |
1322 | case 'G': | |
1323 | result *= 1024; | |
7e5583fd | 1324 | /* fall through */ |
801c135c AB |
1325 | case 'M': |
1326 | result *= 1024; | |
7e5583fd | 1327 | /* fall through */ |
801c135c | 1328 | case 'K': |
801c135c | 1329 | result *= 1024; |
aeddb877 | 1330 | if (endp[1] == 'i' && endp[2] == 'B') |
801c135c AB |
1331 | endp += 2; |
1332 | case '\0': | |
1333 | break; | |
1334 | default: | |
32608703 | 1335 | pr_err("UBI error: incorrect bytes count: \"%s\"\n", str); |
801c135c AB |
1336 | return -EINVAL; |
1337 | } | |
1338 | ||
1339 | return result; | |
1340 | } | |
1341 | ||
1342 | /** | |
1343 | * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter. | |
1344 | * @val: the parameter value to parse | |
1345 | * @kp: not used | |
1346 | * | |
1347 | * This function returns zero in case of success and a negative error code in | |
1348 | * case of error. | |
1349 | */ | |
e4dca7b7 | 1350 | static int ubi_mtd_param_parse(const char *val, const struct kernel_param *kp) |
801c135c AB |
1351 | { |
1352 | int i, len; | |
1353 | struct mtd_dev_param *p; | |
1354 | char buf[MTD_PARAM_LEN_MAX]; | |
1355 | char *pbuf = &buf[0]; | |
83ff59a0 | 1356 | char *tokens[MTD_PARAM_MAX_COUNT], *token; |
801c135c | 1357 | |
77c722dd AB |
1358 | if (!val) |
1359 | return -EINVAL; | |
1360 | ||
801c135c | 1361 | if (mtd_devs == UBI_MAX_DEVICES) { |
32608703 TB |
1362 | pr_err("UBI error: too many parameters, max. is %d\n", |
1363 | UBI_MAX_DEVICES); | |
801c135c AB |
1364 | return -EINVAL; |
1365 | } | |
1366 | ||
1367 | len = strnlen(val, MTD_PARAM_LEN_MAX); | |
1368 | if (len == MTD_PARAM_LEN_MAX) { | |
32608703 TB |
1369 | pr_err("UBI error: parameter \"%s\" is too long, max. is %d\n", |
1370 | val, MTD_PARAM_LEN_MAX); | |
801c135c AB |
1371 | return -EINVAL; |
1372 | } | |
1373 | ||
1374 | if (len == 0) { | |
45fc5c81 | 1375 | pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n"); |
801c135c AB |
1376 | return 0; |
1377 | } | |
1378 | ||
1379 | strcpy(buf, val); | |
1380 | ||
1381 | /* Get rid of the final newline */ | |
1382 | if (buf[len - 1] == '\n') | |
503990eb | 1383 | buf[len - 1] = '\0'; |
801c135c | 1384 | |
5993f9b7 | 1385 | for (i = 0; i < MTD_PARAM_MAX_COUNT; i++) |
801c135c AB |
1386 | tokens[i] = strsep(&pbuf, ","); |
1387 | ||
1388 | if (pbuf) { | |
32608703 | 1389 | pr_err("UBI error: too many arguments at \"%s\"\n", val); |
801c135c AB |
1390 | return -EINVAL; |
1391 | } | |
1392 | ||
801c135c AB |
1393 | p = &mtd_dev_param[mtd_devs]; |
1394 | strcpy(&p->name[0], tokens[0]); | |
1395 | ||
83ff59a0 MF |
1396 | token = tokens[1]; |
1397 | if (token) { | |
1398 | p->vid_hdr_offs = bytes_str_to_int(token); | |
801c135c | 1399 | |
83ff59a0 MF |
1400 | if (p->vid_hdr_offs < 0) |
1401 | return p->vid_hdr_offs; | |
1402 | } | |
801c135c | 1403 | |
83ff59a0 MF |
1404 | token = tokens[2]; |
1405 | if (token) { | |
1406 | int err = kstrtoint(token, 10, &p->max_beb_per1024); | |
edac493d RG |
1407 | |
1408 | if (err) { | |
32608703 TB |
1409 | pr_err("UBI error: bad value for max_beb_per1024 parameter: %s", |
1410 | token); | |
edac493d RG |
1411 | return -EINVAL; |
1412 | } | |
1413 | } | |
1414 | ||
83ff59a0 MF |
1415 | token = tokens[3]; |
1416 | if (token) { | |
1417 | int err = kstrtoint(token, 10, &p->ubi_num); | |
1418 | ||
1419 | if (err) { | |
32608703 TB |
1420 | pr_err("UBI error: bad value for ubi_num parameter: %s", |
1421 | token); | |
83ff59a0 MF |
1422 | return -EINVAL; |
1423 | } | |
1424 | } else | |
1425 | p->ubi_num = UBI_DEV_NUM_AUTO; | |
1426 | ||
801c135c AB |
1427 | mtd_devs += 1; |
1428 | return 0; | |
1429 | } | |
1430 | ||
997d30cb | 1431 | module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 0400); |
83ff59a0 | 1432 | MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024[,ubi_num]]].\n" |
801c135c | 1433 | "Multiple \"mtd\" parameters may be specified.\n" |
edac493d RG |
1434 | "MTD devices may be specified by their number, name, or path to the MTD character device node.\n" |
1435 | "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n" | |
1436 | "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value (" | |
1437 | __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n" | |
83ff59a0 | 1438 | "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 |
1439 | "\n" |
1440 | "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n" | |
1441 | "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" | |
1442 | "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 | 1443 | "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 | 1444 | "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device)."); |
77e6c2f0 RW |
1445 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1446 | module_param(fm_autoconvert, bool, 0644); | |
1447 | MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap."); | |
479c2c0c RW |
1448 | module_param(fm_debug, bool, 0); |
1449 | MODULE_PARM_DESC(fm_debug, "Set this parameter to enable fastmap debugging by default. Warning, this will make fastmap slow!"); | |
77e6c2f0 | 1450 | #endif |
801c135c AB |
1451 | MODULE_VERSION(__stringify(UBI_VERSION)); |
1452 | MODULE_DESCRIPTION("UBI - Unsorted Block Images"); | |
1453 | MODULE_AUTHOR("Artem Bityutskiy"); | |
1454 | MODULE_LICENSE("GPL"); |