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f399d4a2 KP |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * Copyright (c) Nokia Corporation, 2007 | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
f399d4a2 KP |
6 | * |
7 | * Author: Artem Bityutskiy (Битюцкий Артём), | |
8 | * Frank Haverkamp | |
9 | */ | |
10 | ||
11 | /* | |
12 | * This file includes UBI initialization and building of UBI devices. | |
13 | * | |
14 | * When UBI is initialized, it attaches all the MTD devices specified as the | |
15 | * module load parameters or the kernel boot parameters. If MTD devices were | |
16 | * specified, UBI does not attach any MTD device, but it is possible to do | |
17 | * later using the "UBI control device". | |
f399d4a2 KP |
18 | */ |
19 | ||
ff94bc40 | 20 | #ifndef __UBOOT__ |
f399d4a2 KP |
21 | #include <linux/module.h> |
22 | #include <linux/moduleparam.h> | |
23 | #include <linux/stringify.h> | |
ff94bc40 | 24 | #include <linux/namei.h> |
f399d4a2 KP |
25 | #include <linux/stat.h> |
26 | #include <linux/miscdevice.h> | |
27 | #include <linux/log2.h> | |
28 | #include <linux/kthread.h> | |
ff94bc40 HS |
29 | #include <linux/kernel.h> |
30 | #include <linux/slab.h> | |
31 | #include <linux/major.h> | |
32 | #else | |
84b8bf6d | 33 | #include <linux/bug.h> |
f8fdb81f | 34 | #include <linux/log2.h> |
f399d4a2 | 35 | #endif |
ff94bc40 | 36 | #include <linux/err.h> |
f399d4a2 | 37 | #include <ubi_uboot.h> |
ff94bc40 HS |
38 | #include <linux/mtd/partitions.h> |
39 | ||
f399d4a2 KP |
40 | #include "ubi.h" |
41 | ||
ff94bc40 HS |
42 | /* Maximum length of the 'mtd=' parameter */ |
43 | #define MTD_PARAM_LEN_MAX 64 | |
44 | ||
45 | /* Maximum number of comma-separated items in the 'mtd=' parameter */ | |
46 | #define MTD_PARAM_MAX_COUNT 4 | |
47 | ||
48 | /* Maximum value for the number of bad PEBs per 1024 PEBs */ | |
49 | #define MAX_MTD_UBI_BEB_LIMIT 768 | |
50 | ||
51 | #ifdef CONFIG_MTD_UBI_MODULE | |
52 | #define ubi_is_module() 1 | |
53 | #else | |
54 | #define ubi_is_module() 0 | |
55 | #endif | |
56 | ||
60cfe87b SR |
57 | #if (CONFIG_SYS_MALLOC_LEN < (512 << 10)) |
58 | #error Malloc area too small for UBI, increase CONFIG_SYS_MALLOC_LEN to >= 512k | |
59 | #endif | |
60 | ||
f399d4a2 KP |
61 | /** |
62 | * struct mtd_dev_param - MTD device parameter description data structure. | |
ff94bc40 HS |
63 | * @name: MTD character device node path, MTD device name, or MTD device number |
64 | * string | |
f399d4a2 | 65 | * @vid_hdr_offs: VID header offset |
ff94bc40 | 66 | * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs |
f399d4a2 | 67 | */ |
ff94bc40 | 68 | struct mtd_dev_param { |
f399d4a2 | 69 | char name[MTD_PARAM_LEN_MAX]; |
ff94bc40 | 70 | int ubi_num; |
f399d4a2 | 71 | int vid_hdr_offs; |
ff94bc40 | 72 | int max_beb_per1024; |
f399d4a2 KP |
73 | }; |
74 | ||
75 | /* Numbers of elements set in the @mtd_dev_param array */ | |
ff94bc40 | 76 | static int __initdata mtd_devs; |
f399d4a2 KP |
77 | |
78 | /* MTD devices specification parameters */ | |
ff94bc40 HS |
79 | static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES]; |
80 | #ifndef __UBOOT__ | |
81 | #ifdef CONFIG_MTD_UBI_FASTMAP | |
82 | /* UBI module parameter to enable fastmap automatically on non-fastmap images */ | |
83 | static bool fm_autoconvert; | |
0195a7bb | 84 | static bool fm_debug; |
ff94bc40 HS |
85 | #endif |
86 | #else | |
87 | #ifdef CONFIG_MTD_UBI_FASTMAP | |
88 | #if !defined(CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT) | |
89 | #define CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT 0 | |
90 | #endif | |
91 | static bool fm_autoconvert = CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT; | |
0195a7bb HS |
92 | #if !defined(CONFIG_MTD_UBI_FM_DEBUG) |
93 | #define CONFIG_MTD_UBI_FM_DEBUG 0 | |
94 | #endif | |
95 | static bool fm_debug = CONFIG_MTD_UBI_FM_DEBUG; | |
ff94bc40 HS |
96 | #endif |
97 | #endif | |
f399d4a2 | 98 | |
f399d4a2 KP |
99 | /* Slab cache for wear-leveling entries */ |
100 | struct kmem_cache *ubi_wl_entry_slab; | |
101 | ||
ff94bc40 | 102 | #ifndef __UBOOT__ |
f399d4a2 KP |
103 | /* UBI control character device */ |
104 | static struct miscdevice ubi_ctrl_cdev = { | |
105 | .minor = MISC_DYNAMIC_MINOR, | |
106 | .name = "ubi_ctrl", | |
107 | .fops = &ubi_ctrl_cdev_operations, | |
108 | }; | |
109 | #endif | |
110 | ||
111 | /* All UBI devices in system */ | |
ff94bc40 HS |
112 | #ifndef __UBOOT__ |
113 | static struct ubi_device *ubi_devices[UBI_MAX_DEVICES]; | |
114 | #else | |
f399d4a2 | 115 | struct ubi_device *ubi_devices[UBI_MAX_DEVICES]; |
ff94bc40 | 116 | #endif |
0195a7bb | 117 | |
ff94bc40 | 118 | #ifndef __UBOOT__ |
f399d4a2 KP |
119 | /* Serializes UBI devices creations and removals */ |
120 | DEFINE_MUTEX(ubi_devices_mutex); | |
121 | ||
122 | /* Protects @ubi_devices and @ubi->ref_count */ | |
123 | static DEFINE_SPINLOCK(ubi_devices_lock); | |
124 | ||
125 | /* "Show" method for files in '/<sysfs>/class/ubi/' */ | |
ff94bc40 HS |
126 | static ssize_t ubi_version_show(struct class *class, |
127 | struct class_attribute *attr, char *buf) | |
f399d4a2 KP |
128 | { |
129 | return sprintf(buf, "%d\n", UBI_VERSION); | |
130 | } | |
131 | ||
132 | /* UBI version attribute ('/<sysfs>/class/ubi/version') */ | |
0195a7bb HS |
133 | static struct class_attribute ubi_class_attrs[] = { |
134 | __ATTR(version, S_IRUGO, ubi_version_show, NULL), | |
135 | __ATTR_NULL | |
136 | }; | |
137 | ||
138 | /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */ | |
139 | struct class ubi_class = { | |
140 | .name = UBI_NAME_STR, | |
141 | .owner = THIS_MODULE, | |
142 | .class_attrs = ubi_class_attrs, | |
143 | }; | |
f399d4a2 KP |
144 | |
145 | static ssize_t dev_attribute_show(struct device *dev, | |
146 | struct device_attribute *attr, char *buf); | |
147 | ||
148 | /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */ | |
149 | static struct device_attribute dev_eraseblock_size = | |
150 | __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL); | |
151 | static struct device_attribute dev_avail_eraseblocks = | |
152 | __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
153 | static struct device_attribute dev_total_eraseblocks = | |
154 | __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL); | |
155 | static struct device_attribute dev_volumes_count = | |
156 | __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL); | |
157 | static struct device_attribute dev_max_ec = | |
158 | __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL); | |
159 | static struct device_attribute dev_reserved_for_bad = | |
160 | __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL); | |
161 | static struct device_attribute dev_bad_peb_count = | |
162 | __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL); | |
163 | static struct device_attribute dev_max_vol_count = | |
164 | __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL); | |
165 | static struct device_attribute dev_min_io_size = | |
166 | __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL); | |
167 | static struct device_attribute dev_bgt_enabled = | |
168 | __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL); | |
169 | static struct device_attribute dev_mtd_num = | |
170 | __ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL); | |
171 | #endif | |
172 | ||
ff94bc40 HS |
173 | /** |
174 | * ubi_volume_notify - send a volume change notification. | |
175 | * @ubi: UBI device description object | |
176 | * @vol: volume description object of the changed volume | |
177 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
178 | * | |
179 | * This is a helper function which notifies all subscribers about a volume | |
180 | * change event (creation, removal, re-sizing, re-naming, updating). Returns | |
181 | * zero in case of success and a negative error code in case of failure. | |
182 | */ | |
183 | int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype) | |
184 | { | |
0195a7bb | 185 | int ret; |
ff94bc40 HS |
186 | struct ubi_notification nt; |
187 | ||
188 | ubi_do_get_device_info(ubi, &nt.di); | |
189 | ubi_do_get_volume_info(ubi, vol, &nt.vi); | |
190 | ||
ff94bc40 HS |
191 | switch (ntype) { |
192 | case UBI_VOLUME_ADDED: | |
193 | case UBI_VOLUME_REMOVED: | |
194 | case UBI_VOLUME_RESIZED: | |
195 | case UBI_VOLUME_RENAMED: | |
0195a7bb HS |
196 | ret = ubi_update_fastmap(ubi); |
197 | if (ret) | |
198 | ubi_msg(ubi, "Unable to write a new fastmap: %i", ret); | |
ff94bc40 | 199 | } |
0195a7bb | 200 | |
ff94bc40 HS |
201 | return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt); |
202 | } | |
203 | ||
204 | /** | |
205 | * ubi_notify_all - send a notification to all volumes. | |
206 | * @ubi: UBI device description object | |
207 | * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) | |
208 | * @nb: the notifier to call | |
209 | * | |
210 | * This function walks all volumes of UBI device @ubi and sends the @ntype | |
211 | * notification for each volume. If @nb is %NULL, then all registered notifiers | |
212 | * are called, otherwise only the @nb notifier is called. Returns the number of | |
213 | * sent notifications. | |
214 | */ | |
215 | int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb) | |
216 | { | |
217 | struct ubi_notification nt; | |
218 | int i, count = 0; | |
219 | #ifndef __UBOOT__ | |
220 | int ret; | |
221 | #endif | |
222 | ||
223 | ubi_do_get_device_info(ubi, &nt.di); | |
224 | ||
225 | mutex_lock(&ubi->device_mutex); | |
226 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
227 | /* | |
228 | * Since the @ubi->device is locked, and we are not going to | |
229 | * change @ubi->volumes, we do not have to lock | |
230 | * @ubi->volumes_lock. | |
231 | */ | |
232 | if (!ubi->volumes[i]) | |
233 | continue; | |
234 | ||
235 | ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi); | |
236 | #ifndef __UBOOT__ | |
237 | if (nb) | |
238 | nb->notifier_call(nb, ntype, &nt); | |
239 | else | |
240 | ret = blocking_notifier_call_chain(&ubi_notifiers, ntype, | |
241 | &nt); | |
242 | #endif | |
243 | count += 1; | |
244 | } | |
245 | mutex_unlock(&ubi->device_mutex); | |
246 | ||
247 | return count; | |
248 | } | |
249 | ||
250 | /** | |
251 | * ubi_enumerate_volumes - send "add" notification for all existing volumes. | |
252 | * @nb: the notifier to call | |
253 | * | |
254 | * This function walks all UBI devices and volumes and sends the | |
255 | * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all | |
256 | * registered notifiers are called, otherwise only the @nb notifier is called. | |
257 | * Returns the number of sent notifications. | |
258 | */ | |
259 | int ubi_enumerate_volumes(struct notifier_block *nb) | |
260 | { | |
261 | int i, count = 0; | |
262 | ||
263 | /* | |
264 | * Since the @ubi_devices_mutex is locked, and we are not going to | |
265 | * change @ubi_devices, we do not have to lock @ubi_devices_lock. | |
266 | */ | |
267 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
268 | struct ubi_device *ubi = ubi_devices[i]; | |
269 | ||
270 | if (!ubi) | |
271 | continue; | |
272 | count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb); | |
273 | } | |
274 | ||
275 | return count; | |
276 | } | |
277 | ||
f399d4a2 KP |
278 | /** |
279 | * ubi_get_device - get UBI device. | |
280 | * @ubi_num: UBI device number | |
281 | * | |
282 | * This function returns UBI device description object for UBI device number | |
283 | * @ubi_num, or %NULL if the device does not exist. This function increases the | |
284 | * device reference count to prevent removal of the device. In other words, the | |
285 | * device cannot be removed if its reference count is not zero. | |
286 | */ | |
287 | struct ubi_device *ubi_get_device(int ubi_num) | |
288 | { | |
289 | struct ubi_device *ubi; | |
290 | ||
291 | spin_lock(&ubi_devices_lock); | |
292 | ubi = ubi_devices[ubi_num]; | |
293 | if (ubi) { | |
294 | ubi_assert(ubi->ref_count >= 0); | |
295 | ubi->ref_count += 1; | |
296 | get_device(&ubi->dev); | |
297 | } | |
298 | spin_unlock(&ubi_devices_lock); | |
299 | ||
300 | return ubi; | |
301 | } | |
302 | ||
303 | /** | |
304 | * ubi_put_device - drop an UBI device reference. | |
305 | * @ubi: UBI device description object | |
306 | */ | |
307 | void ubi_put_device(struct ubi_device *ubi) | |
308 | { | |
309 | spin_lock(&ubi_devices_lock); | |
310 | ubi->ref_count -= 1; | |
311 | put_device(&ubi->dev); | |
312 | spin_unlock(&ubi_devices_lock); | |
313 | } | |
314 | ||
315 | /** | |
ff94bc40 | 316 | * ubi_get_by_major - get UBI device by character device major number. |
f399d4a2 KP |
317 | * @major: major number |
318 | * | |
319 | * This function is similar to 'ubi_get_device()', but it searches the device | |
320 | * by its major number. | |
321 | */ | |
322 | struct ubi_device *ubi_get_by_major(int major) | |
323 | { | |
324 | int i; | |
325 | struct ubi_device *ubi; | |
326 | ||
327 | spin_lock(&ubi_devices_lock); | |
328 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
329 | ubi = ubi_devices[i]; | |
330 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
331 | ubi_assert(ubi->ref_count >= 0); | |
332 | ubi->ref_count += 1; | |
333 | get_device(&ubi->dev); | |
334 | spin_unlock(&ubi_devices_lock); | |
335 | return ubi; | |
336 | } | |
337 | } | |
338 | spin_unlock(&ubi_devices_lock); | |
339 | ||
340 | return NULL; | |
341 | } | |
342 | ||
343 | /** | |
344 | * ubi_major2num - get UBI device number by character device major number. | |
345 | * @major: major number | |
346 | * | |
347 | * This function searches UBI device number object by its major number. If UBI | |
348 | * device was not found, this function returns -ENODEV, otherwise the UBI device | |
349 | * number is returned. | |
350 | */ | |
351 | int ubi_major2num(int major) | |
352 | { | |
353 | int i, ubi_num = -ENODEV; | |
354 | ||
355 | spin_lock(&ubi_devices_lock); | |
356 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
357 | struct ubi_device *ubi = ubi_devices[i]; | |
358 | ||
359 | if (ubi && MAJOR(ubi->cdev.dev) == major) { | |
360 | ubi_num = ubi->ubi_num; | |
361 | break; | |
362 | } | |
363 | } | |
364 | spin_unlock(&ubi_devices_lock); | |
365 | ||
366 | return ubi_num; | |
367 | } | |
368 | ||
ff94bc40 | 369 | #ifndef __UBOOT__ |
f399d4a2 KP |
370 | /* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */ |
371 | static ssize_t dev_attribute_show(struct device *dev, | |
372 | struct device_attribute *attr, char *buf) | |
373 | { | |
374 | ssize_t ret; | |
375 | struct ubi_device *ubi; | |
376 | ||
377 | /* | |
378 | * The below code looks weird, but it actually makes sense. We get the | |
379 | * UBI device reference from the contained 'struct ubi_device'. But it | |
380 | * is unclear if the device was removed or not yet. Indeed, if the | |
381 | * device was removed before we increased its reference count, | |
382 | * 'ubi_get_device()' will return -ENODEV and we fail. | |
383 | * | |
384 | * Remember, 'struct ubi_device' is freed in the release function, so | |
385 | * we still can use 'ubi->ubi_num'. | |
386 | */ | |
387 | ubi = container_of(dev, struct ubi_device, dev); | |
388 | ubi = ubi_get_device(ubi->ubi_num); | |
389 | if (!ubi) | |
390 | return -ENODEV; | |
391 | ||
392 | if (attr == &dev_eraseblock_size) | |
393 | ret = sprintf(buf, "%d\n", ubi->leb_size); | |
394 | else if (attr == &dev_avail_eraseblocks) | |
395 | ret = sprintf(buf, "%d\n", ubi->avail_pebs); | |
396 | else if (attr == &dev_total_eraseblocks) | |
397 | ret = sprintf(buf, "%d\n", ubi->good_peb_count); | |
398 | else if (attr == &dev_volumes_count) | |
399 | ret = sprintf(buf, "%d\n", ubi->vol_count - UBI_INT_VOL_COUNT); | |
400 | else if (attr == &dev_max_ec) | |
401 | ret = sprintf(buf, "%d\n", ubi->max_ec); | |
402 | else if (attr == &dev_reserved_for_bad) | |
403 | ret = sprintf(buf, "%d\n", ubi->beb_rsvd_pebs); | |
404 | else if (attr == &dev_bad_peb_count) | |
405 | ret = sprintf(buf, "%d\n", ubi->bad_peb_count); | |
406 | else if (attr == &dev_max_vol_count) | |
407 | ret = sprintf(buf, "%d\n", ubi->vtbl_slots); | |
408 | else if (attr == &dev_min_io_size) | |
409 | ret = sprintf(buf, "%d\n", ubi->min_io_size); | |
410 | else if (attr == &dev_bgt_enabled) | |
411 | ret = sprintf(buf, "%d\n", ubi->thread_enabled); | |
412 | else if (attr == &dev_mtd_num) | |
413 | ret = sprintf(buf, "%d\n", ubi->mtd->index); | |
414 | else | |
415 | ret = -EINVAL; | |
416 | ||
417 | ubi_put_device(ubi); | |
418 | return ret; | |
419 | } | |
420 | ||
0195a7bb HS |
421 | static struct attribute *ubi_dev_attrs[] = { |
422 | &dev_eraseblock_size.attr, | |
423 | &dev_avail_eraseblocks.attr, | |
424 | &dev_total_eraseblocks.attr, | |
425 | &dev_volumes_count.attr, | |
426 | &dev_max_ec.attr, | |
427 | &dev_reserved_for_bad.attr, | |
428 | &dev_bad_peb_count.attr, | |
429 | &dev_max_vol_count.attr, | |
430 | &dev_min_io_size.attr, | |
431 | &dev_bgt_enabled.attr, | |
432 | &dev_mtd_num.attr, | |
433 | NULL | |
434 | }; | |
435 | ATTRIBUTE_GROUPS(ubi_dev); | |
436 | ||
ff94bc40 HS |
437 | static void dev_release(struct device *dev) |
438 | { | |
439 | struct ubi_device *ubi = container_of(dev, struct ubi_device, dev); | |
440 | ||
441 | kfree(ubi); | |
442 | } | |
f399d4a2 KP |
443 | |
444 | /** | |
445 | * ubi_sysfs_init - initialize sysfs for an UBI device. | |
446 | * @ubi: UBI device description object | |
ff94bc40 HS |
447 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
448 | * taken | |
f399d4a2 KP |
449 | * |
450 | * This function returns zero in case of success and a negative error code in | |
451 | * case of failure. | |
452 | */ | |
ff94bc40 | 453 | static int ubi_sysfs_init(struct ubi_device *ubi, int *ref) |
f399d4a2 KP |
454 | { |
455 | int err; | |
456 | ||
457 | ubi->dev.release = dev_release; | |
458 | ubi->dev.devt = ubi->cdev.dev; | |
0195a7bb HS |
459 | ubi->dev.class = &ubi_class; |
460 | ubi->dev.groups = ubi_dev_groups; | |
ff94bc40 | 461 | dev_set_name(&ubi->dev, UBI_NAME_STR"%d", ubi->ubi_num); |
f399d4a2 KP |
462 | err = device_register(&ubi->dev); |
463 | if (err) | |
464 | return err; | |
465 | ||
ff94bc40 | 466 | *ref = 1; |
0195a7bb | 467 | return 0; |
f399d4a2 KP |
468 | } |
469 | ||
470 | /** | |
471 | * ubi_sysfs_close - close sysfs for an UBI device. | |
472 | * @ubi: UBI device description object | |
473 | */ | |
474 | static void ubi_sysfs_close(struct ubi_device *ubi) | |
475 | { | |
f399d4a2 KP |
476 | device_unregister(&ubi->dev); |
477 | } | |
478 | #endif | |
479 | ||
480 | /** | |
ff94bc40 | 481 | * kill_volumes - destroy all user volumes. |
f399d4a2 KP |
482 | * @ubi: UBI device description object |
483 | */ | |
484 | static void kill_volumes(struct ubi_device *ubi) | |
485 | { | |
486 | int i; | |
487 | ||
488 | for (i = 0; i < ubi->vtbl_slots; i++) | |
489 | if (ubi->volumes[i]) | |
490 | ubi_free_volume(ubi, ubi->volumes[i]); | |
491 | } | |
492 | ||
493 | /** | |
494 | * uif_init - initialize user interfaces for an UBI device. | |
495 | * @ubi: UBI device description object | |
ff94bc40 HS |
496 | * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was |
497 | * taken, otherwise set to %0 | |
498 | * | |
499 | * This function initializes various user interfaces for an UBI device. If the | |
500 | * initialization fails at an early stage, this function frees all the | |
501 | * resources it allocated, returns an error, and @ref is set to %0. However, | |
502 | * if the initialization fails after the UBI device was registered in the | |
503 | * driver core subsystem, this function takes a reference to @ubi->dev, because | |
504 | * otherwise the release function ('dev_release()') would free whole @ubi | |
505 | * object. The @ref argument is set to %1 in this case. The caller has to put | |
506 | * this reference. | |
f399d4a2 KP |
507 | * |
508 | * This function returns zero in case of success and a negative error code in | |
509 | * case of failure. | |
510 | */ | |
ff94bc40 | 511 | static int uif_init(struct ubi_device *ubi, int *ref) |
f399d4a2 KP |
512 | { |
513 | int i, err; | |
ff94bc40 | 514 | #ifndef __UBOOT__ |
f399d4a2 KP |
515 | dev_t dev; |
516 | #endif | |
517 | ||
ff94bc40 | 518 | *ref = 0; |
f399d4a2 KP |
519 | sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num); |
520 | ||
521 | /* | |
522 | * Major numbers for the UBI character devices are allocated | |
523 | * dynamically. Major numbers of volume character devices are | |
524 | * equivalent to ones of the corresponding UBI character device. Minor | |
525 | * numbers of UBI character devices are 0, while minor numbers of | |
526 | * volume character devices start from 1. Thus, we allocate one major | |
527 | * number and ubi->vtbl_slots + 1 minor numbers. | |
528 | */ | |
529 | err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name); | |
530 | if (err) { | |
0195a7bb | 531 | ubi_err(ubi, "cannot register UBI character devices"); |
f399d4a2 KP |
532 | return err; |
533 | } | |
534 | ||
535 | ubi_assert(MINOR(dev) == 0); | |
536 | cdev_init(&ubi->cdev, &ubi_cdev_operations); | |
ff94bc40 | 537 | dbg_gen("%s major is %u", ubi->ubi_name, MAJOR(dev)); |
f399d4a2 KP |
538 | ubi->cdev.owner = THIS_MODULE; |
539 | ||
540 | err = cdev_add(&ubi->cdev, dev, 1); | |
541 | if (err) { | |
0195a7bb | 542 | ubi_err(ubi, "cannot add character device"); |
f399d4a2 KP |
543 | goto out_unreg; |
544 | } | |
545 | ||
ff94bc40 | 546 | err = ubi_sysfs_init(ubi, ref); |
f399d4a2 KP |
547 | if (err) |
548 | goto out_sysfs; | |
549 | ||
550 | for (i = 0; i < ubi->vtbl_slots; i++) | |
551 | if (ubi->volumes[i]) { | |
552 | err = ubi_add_volume(ubi, ubi->volumes[i]); | |
553 | if (err) { | |
0195a7bb | 554 | ubi_err(ubi, "cannot add volume %d", i); |
f399d4a2 KP |
555 | goto out_volumes; |
556 | } | |
557 | } | |
558 | ||
559 | return 0; | |
560 | ||
561 | out_volumes: | |
562 | kill_volumes(ubi); | |
563 | out_sysfs: | |
ff94bc40 HS |
564 | if (*ref) |
565 | get_device(&ubi->dev); | |
f399d4a2 KP |
566 | ubi_sysfs_close(ubi); |
567 | cdev_del(&ubi->cdev); | |
568 | out_unreg: | |
569 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); | |
0195a7bb HS |
570 | ubi_err(ubi, "cannot initialize UBI %s, error %d", |
571 | ubi->ubi_name, err); | |
f399d4a2 KP |
572 | return err; |
573 | } | |
574 | ||
575 | /** | |
576 | * uif_close - close user interfaces for an UBI device. | |
577 | * @ubi: UBI device description object | |
ff94bc40 HS |
578 | * |
579 | * Note, since this function un-registers UBI volume device objects (@vol->dev), | |
580 | * the memory allocated voe the volumes is freed as well (in the release | |
581 | * function). | |
f399d4a2 KP |
582 | */ |
583 | static void uif_close(struct ubi_device *ubi) | |
584 | { | |
585 | kill_volumes(ubi); | |
586 | ubi_sysfs_close(ubi); | |
587 | cdev_del(&ubi->cdev); | |
588 | unregister_chrdev_region(ubi->cdev.dev, ubi->vtbl_slots + 1); | |
589 | } | |
590 | ||
591 | /** | |
ff94bc40 HS |
592 | * ubi_free_internal_volumes - free internal volumes. |
593 | * @ubi: UBI device description object | |
f399d4a2 | 594 | */ |
ff94bc40 | 595 | void ubi_free_internal_volumes(struct ubi_device *ubi) |
f399d4a2 | 596 | { |
ff94bc40 | 597 | int i; |
f399d4a2 | 598 | |
ff94bc40 HS |
599 | for (i = ubi->vtbl_slots; |
600 | i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { | |
601 | kfree(ubi->volumes[i]->eba_tbl); | |
602 | kfree(ubi->volumes[i]); | |
603 | } | |
604 | } | |
f399d4a2 | 605 | |
ff94bc40 HS |
606 | static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024) |
607 | { | |
608 | int limit, device_pebs; | |
609 | uint64_t device_size; | |
f399d4a2 | 610 | |
ff94bc40 HS |
611 | if (!max_beb_per1024) |
612 | return 0; | |
f399d4a2 | 613 | |
ff94bc40 HS |
614 | /* |
615 | * Here we are using size of the entire flash chip and | |
616 | * not just the MTD partition size because the maximum | |
617 | * number of bad eraseblocks is a percentage of the | |
618 | * whole device and bad eraseblocks are not fairly | |
619 | * distributed over the flash chip. So the worst case | |
620 | * is that all the bad eraseblocks of the chip are in | |
621 | * the MTD partition we are attaching (ubi->mtd). | |
622 | */ | |
623 | device_size = mtd_get_device_size(ubi->mtd); | |
624 | device_pebs = mtd_div_by_eb(device_size, ubi->mtd); | |
625 | limit = mult_frac(device_pebs, max_beb_per1024, 1024); | |
f399d4a2 | 626 | |
ff94bc40 HS |
627 | /* Round it up */ |
628 | if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs) | |
629 | limit += 1; | |
d6389465 | 630 | |
ff94bc40 | 631 | return limit; |
f399d4a2 KP |
632 | } |
633 | ||
634 | /** | |
ff94bc40 | 635 | * io_init - initialize I/O sub-system for a given UBI device. |
f399d4a2 | 636 | * @ubi: UBI device description object |
ff94bc40 | 637 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
f399d4a2 KP |
638 | * |
639 | * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are | |
640 | * assumed: | |
641 | * o EC header is always at offset zero - this cannot be changed; | |
642 | * o VID header starts just after the EC header at the closest address | |
643 | * aligned to @io->hdrs_min_io_size; | |
644 | * o data starts just after the VID header at the closest address aligned to | |
645 | * @io->min_io_size | |
646 | * | |
647 | * This function returns zero in case of success and a negative error code in | |
648 | * case of failure. | |
649 | */ | |
ff94bc40 | 650 | static int io_init(struct ubi_device *ubi, int max_beb_per1024) |
f399d4a2 | 651 | { |
ff94bc40 HS |
652 | dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb)); |
653 | dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry)); | |
654 | ||
f399d4a2 KP |
655 | if (ubi->mtd->numeraseregions != 0) { |
656 | /* | |
657 | * Some flashes have several erase regions. Different regions | |
658 | * may have different eraseblock size and other | |
659 | * characteristics. It looks like mostly multi-region flashes | |
660 | * have one "main" region and one or more small regions to | |
661 | * store boot loader code or boot parameters or whatever. I | |
662 | * guess we should just pick the largest region. But this is | |
663 | * not implemented. | |
664 | */ | |
0195a7bb | 665 | ubi_err(ubi, "multiple regions, not implemented"); |
f399d4a2 KP |
666 | return -EINVAL; |
667 | } | |
668 | ||
669 | if (ubi->vid_hdr_offset < 0) | |
670 | return -EINVAL; | |
671 | ||
672 | /* | |
673 | * Note, in this implementation we support MTD devices with 0x7FFFFFFF | |
674 | * physical eraseblocks maximum. | |
675 | */ | |
676 | ||
677 | ubi->peb_size = ubi->mtd->erasesize; | |
d318d0c4 | 678 | ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd); |
f399d4a2 KP |
679 | ubi->flash_size = ubi->mtd->size; |
680 | ||
ff94bc40 | 681 | if (mtd_can_have_bb(ubi->mtd)) { |
f399d4a2 | 682 | ubi->bad_allowed = 1; |
ff94bc40 HS |
683 | ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024); |
684 | } | |
685 | ||
686 | if (ubi->mtd->type == MTD_NORFLASH) { | |
687 | ubi_assert(ubi->mtd->writesize == 1); | |
688 | ubi->nor_flash = 1; | |
689 | } | |
f399d4a2 KP |
690 | |
691 | ubi->min_io_size = ubi->mtd->writesize; | |
692 | ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; | |
693 | ||
694 | /* | |
695 | * Make sure minimal I/O unit is power of 2. Note, there is no | |
696 | * fundamental reason for this assumption. It is just an optimization | |
697 | * which allows us to avoid costly division operations. | |
698 | */ | |
699 | if (!is_power_of_2(ubi->min_io_size)) { | |
0195a7bb | 700 | ubi_err(ubi, "min. I/O unit (%d) is not power of 2", |
f399d4a2 KP |
701 | ubi->min_io_size); |
702 | return -EINVAL; | |
703 | } | |
704 | ||
705 | ubi_assert(ubi->hdrs_min_io_size > 0); | |
706 | ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size); | |
707 | ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0); | |
708 | ||
ff94bc40 HS |
709 | ubi->max_write_size = ubi->mtd->writebufsize; |
710 | /* | |
711 | * Maximum write size has to be greater or equivalent to min. I/O | |
712 | * size, and be multiple of min. I/O size. | |
713 | */ | |
714 | if (ubi->max_write_size < ubi->min_io_size || | |
715 | ubi->max_write_size % ubi->min_io_size || | |
716 | !is_power_of_2(ubi->max_write_size)) { | |
0195a7bb | 717 | ubi_err(ubi, "bad write buffer size %d for %d min. I/O unit", |
ff94bc40 HS |
718 | ubi->max_write_size, ubi->min_io_size); |
719 | return -EINVAL; | |
720 | } | |
721 | ||
f399d4a2 KP |
722 | /* Calculate default aligned sizes of EC and VID headers */ |
723 | ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size); | |
724 | ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size); | |
725 | ||
ff94bc40 HS |
726 | dbg_gen("min_io_size %d", ubi->min_io_size); |
727 | dbg_gen("max_write_size %d", ubi->max_write_size); | |
728 | dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size); | |
729 | dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize); | |
730 | dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize); | |
f399d4a2 KP |
731 | |
732 | if (ubi->vid_hdr_offset == 0) | |
733 | /* Default offset */ | |
734 | ubi->vid_hdr_offset = ubi->vid_hdr_aloffset = | |
735 | ubi->ec_hdr_alsize; | |
736 | else { | |
737 | ubi->vid_hdr_aloffset = ubi->vid_hdr_offset & | |
738 | ~(ubi->hdrs_min_io_size - 1); | |
739 | ubi->vid_hdr_shift = ubi->vid_hdr_offset - | |
740 | ubi->vid_hdr_aloffset; | |
741 | } | |
742 | ||
743 | /* Similar for the data offset */ | |
ff94bc40 | 744 | ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE; |
f399d4a2 KP |
745 | ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size); |
746 | ||
ff94bc40 HS |
747 | dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset); |
748 | dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset); | |
749 | dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift); | |
750 | dbg_gen("leb_start %d", ubi->leb_start); | |
f399d4a2 KP |
751 | |
752 | /* The shift must be aligned to 32-bit boundary */ | |
753 | if (ubi->vid_hdr_shift % 4) { | |
0195a7bb | 754 | ubi_err(ubi, "unaligned VID header shift %d", |
f399d4a2 KP |
755 | ubi->vid_hdr_shift); |
756 | return -EINVAL; | |
757 | } | |
758 | ||
759 | /* Check sanity */ | |
760 | if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE || | |
761 | ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE || | |
762 | ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE || | |
763 | ubi->leb_start & (ubi->min_io_size - 1)) { | |
0195a7bb | 764 | ubi_err(ubi, "bad VID header (%d) or data offsets (%d)", |
f399d4a2 KP |
765 | ubi->vid_hdr_offset, ubi->leb_start); |
766 | return -EINVAL; | |
767 | } | |
768 | ||
ff94bc40 HS |
769 | /* |
770 | * Set maximum amount of physical erroneous eraseblocks to be 10%. | |
771 | * Erroneous PEB are those which have read errors. | |
772 | */ | |
773 | ubi->max_erroneous = ubi->peb_count / 10; | |
774 | if (ubi->max_erroneous < 16) | |
775 | ubi->max_erroneous = 16; | |
776 | dbg_gen("max_erroneous %d", ubi->max_erroneous); | |
777 | ||
f399d4a2 KP |
778 | /* |
779 | * It may happen that EC and VID headers are situated in one minimal | |
780 | * I/O unit. In this case we can only accept this UBI image in | |
781 | * read-only mode. | |
782 | */ | |
783 | if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) { | |
0195a7bb | 784 | ubi_warn(ubi, "EC and VID headers are in the same minimal I/O unit, switch to read-only mode"); |
f399d4a2 KP |
785 | ubi->ro_mode = 1; |
786 | } | |
787 | ||
788 | ubi->leb_size = ubi->peb_size - ubi->leb_start; | |
789 | ||
790 | if (!(ubi->mtd->flags & MTD_WRITEABLE)) { | |
0195a7bb | 791 | ubi_msg(ubi, "MTD device %d is write-protected, attach in read-only mode", |
ff94bc40 | 792 | ubi->mtd->index); |
f399d4a2 KP |
793 | ubi->ro_mode = 1; |
794 | } | |
795 | ||
f399d4a2 | 796 | /* |
ff94bc40 | 797 | * Note, ideally, we have to initialize @ubi->bad_peb_count here. But |
f399d4a2 KP |
798 | * unfortunately, MTD does not provide this information. We should loop |
799 | * over all physical eraseblocks and invoke mtd->block_is_bad() for | |
ff94bc40 HS |
800 | * each physical eraseblock. So, we leave @ubi->bad_peb_count |
801 | * uninitialized so far. | |
f399d4a2 KP |
802 | */ |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
807 | /** | |
808 | * autoresize - re-size the volume which has the "auto-resize" flag set. | |
809 | * @ubi: UBI device description object | |
810 | * @vol_id: ID of the volume to re-size | |
811 | * | |
ff94bc40 | 812 | * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in |
f399d4a2 KP |
813 | * the volume table to the largest possible size. See comments in ubi-header.h |
814 | * for more description of the flag. Returns zero in case of success and a | |
815 | * negative error code in case of failure. | |
816 | */ | |
817 | static int autoresize(struct ubi_device *ubi, int vol_id) | |
818 | { | |
819 | struct ubi_volume_desc desc; | |
820 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
821 | int err, old_reserved_pebs = vol->reserved_pebs; | |
822 | ||
ff94bc40 | 823 | if (ubi->ro_mode) { |
0195a7bb | 824 | ubi_warn(ubi, "skip auto-resize because of R/O mode"); |
ff94bc40 HS |
825 | return 0; |
826 | } | |
827 | ||
f399d4a2 KP |
828 | /* |
829 | * Clear the auto-resize flag in the volume in-memory copy of the | |
ff94bc40 | 830 | * volume table, and 'ubi_resize_volume()' will propagate this change |
f399d4a2 KP |
831 | * to the flash. |
832 | */ | |
833 | ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG; | |
834 | ||
835 | if (ubi->avail_pebs == 0) { | |
836 | struct ubi_vtbl_record vtbl_rec; | |
837 | ||
838 | /* | |
ff94bc40 | 839 | * No available PEBs to re-size the volume, clear the flag on |
f399d4a2 KP |
840 | * flash and exit. |
841 | */ | |
ff94bc40 | 842 | vtbl_rec = ubi->vtbl[vol_id]; |
f399d4a2 KP |
843 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
844 | if (err) | |
0195a7bb | 845 | ubi_err(ubi, "cannot clean auto-resize flag for volume %d", |
f399d4a2 KP |
846 | vol_id); |
847 | } else { | |
848 | desc.vol = vol; | |
849 | err = ubi_resize_volume(&desc, | |
850 | old_reserved_pebs + ubi->avail_pebs); | |
851 | if (err) | |
0195a7bb HS |
852 | ubi_err(ubi, "cannot auto-resize volume %d", |
853 | vol_id); | |
f399d4a2 KP |
854 | } |
855 | ||
856 | if (err) | |
857 | return err; | |
858 | ||
0195a7bb HS |
859 | ubi_msg(ubi, "volume %d (\"%s\") re-sized from %d to %d LEBs", |
860 | vol_id, vol->name, old_reserved_pebs, vol->reserved_pebs); | |
f399d4a2 KP |
861 | return 0; |
862 | } | |
863 | ||
864 | /** | |
865 | * ubi_attach_mtd_dev - attach an MTD device. | |
ff94bc40 | 866 | * @mtd: MTD device description object |
f399d4a2 KP |
867 | * @ubi_num: number to assign to the new UBI device |
868 | * @vid_hdr_offset: VID header offset | |
ff94bc40 | 869 | * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs |
f399d4a2 KP |
870 | * |
871 | * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number | |
872 | * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in | |
ff94bc40 | 873 | * which case this function finds a vacant device number and assigns it |
f399d4a2 KP |
874 | * automatically. Returns the new UBI device number in case of success and a |
875 | * negative error code in case of failure. | |
876 | * | |
877 | * Note, the invocations of this function has to be serialized by the | |
878 | * @ubi_devices_mutex. | |
879 | */ | |
ff94bc40 HS |
880 | int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, |
881 | int vid_hdr_offset, int max_beb_per1024) | |
f399d4a2 KP |
882 | { |
883 | struct ubi_device *ubi; | |
ff94bc40 HS |
884 | int i, err, ref = 0; |
885 | ||
886 | if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT) | |
887 | return -EINVAL; | |
888 | ||
889 | if (!max_beb_per1024) | |
890 | max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT; | |
f399d4a2 KP |
891 | |
892 | /* | |
893 | * Check if we already have the same MTD device attached. | |
894 | * | |
895 | * Note, this function assumes that UBI devices creations and deletions | |
896 | * are serialized, so it does not take the &ubi_devices_lock. | |
897 | */ | |
898 | for (i = 0; i < UBI_MAX_DEVICES; i++) { | |
899 | ubi = ubi_devices[i]; | |
900 | if (ubi && mtd->index == ubi->mtd->index) { | |
0195a7bb | 901 | ubi_err(ubi, "mtd%d is already attached to ubi%d", |
f399d4a2 KP |
902 | mtd->index, i); |
903 | return -EEXIST; | |
904 | } | |
905 | } | |
906 | ||
907 | /* | |
908 | * Make sure this MTD device is not emulated on top of an UBI volume | |
909 | * already. Well, generally this recursion works fine, but there are | |
910 | * different problems like the UBI module takes a reference to itself | |
911 | * by attaching (and thus, opening) the emulated MTD device. This | |
912 | * results in inability to unload the module. And in general it makes | |
913 | * no sense to attach emulated MTD devices, so we prohibit this. | |
914 | */ | |
915 | if (mtd->type == MTD_UBIVOLUME) { | |
0195a7bb | 916 | ubi_err(ubi, "refuse attaching mtd%d - it is already emulated on top of UBI", |
ff94bc40 | 917 | mtd->index); |
f399d4a2 KP |
918 | return -EINVAL; |
919 | } | |
920 | ||
921 | if (ubi_num == UBI_DEV_NUM_AUTO) { | |
922 | /* Search for an empty slot in the @ubi_devices array */ | |
923 | for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) | |
924 | if (!ubi_devices[ubi_num]) | |
925 | break; | |
926 | if (ubi_num == UBI_MAX_DEVICES) { | |
0195a7bb | 927 | ubi_err(ubi, "only %d UBI devices may be created", |
ff94bc40 | 928 | UBI_MAX_DEVICES); |
f399d4a2 KP |
929 | return -ENFILE; |
930 | } | |
931 | } else { | |
932 | if (ubi_num >= UBI_MAX_DEVICES) | |
933 | return -EINVAL; | |
934 | ||
935 | /* Make sure ubi_num is not busy */ | |
936 | if (ubi_devices[ubi_num]) { | |
0195a7bb | 937 | ubi_err(ubi, "already exists"); |
f399d4a2 KP |
938 | return -EEXIST; |
939 | } | |
940 | } | |
941 | ||
942 | ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL); | |
943 | if (!ubi) | |
944 | return -ENOMEM; | |
945 | ||
946 | ubi->mtd = mtd; | |
947 | ubi->ubi_num = ubi_num; | |
948 | ubi->vid_hdr_offset = vid_hdr_offset; | |
949 | ubi->autoresize_vol_id = -1; | |
950 | ||
ff94bc40 HS |
951 | #ifdef CONFIG_MTD_UBI_FASTMAP |
952 | ubi->fm_pool.used = ubi->fm_pool.size = 0; | |
953 | ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0; | |
954 | ||
955 | /* | |
956 | * fm_pool.max_size is 5% of the total number of PEBs but it's also | |
957 | * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE. | |
958 | */ | |
959 | ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size, | |
960 | ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE); | |
0195a7bb HS |
961 | ubi->fm_pool.max_size = max(ubi->fm_pool.max_size, |
962 | UBI_FM_MIN_POOL_SIZE); | |
ff94bc40 | 963 | |
0195a7bb | 964 | ubi->fm_wl_pool.max_size = ubi->fm_pool.max_size / 2; |
ff94bc40 | 965 | ubi->fm_disabled = !fm_autoconvert; |
0195a7bb HS |
966 | if (fm_debug) |
967 | ubi_enable_dbg_chk_fastmap(ubi); | |
ff94bc40 HS |
968 | |
969 | if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) | |
970 | <= UBI_FM_MAX_START) { | |
0195a7bb | 971 | ubi_err(ubi, "More than %i PEBs are needed for fastmap, sorry.", |
ff94bc40 HS |
972 | UBI_FM_MAX_START); |
973 | ubi->fm_disabled = 1; | |
974 | } | |
975 | ||
0195a7bb HS |
976 | ubi_msg(ubi, "default fastmap pool size: %d", ubi->fm_pool.max_size); |
977 | ubi_msg(ubi, "default fastmap WL pool size: %d", | |
978 | ubi->fm_wl_pool.max_size); | |
ff94bc40 HS |
979 | #else |
980 | ubi->fm_disabled = 1; | |
981 | #endif | |
f399d4a2 KP |
982 | mutex_init(&ubi->buf_mutex); |
983 | mutex_init(&ubi->ckvol_mutex); | |
ff94bc40 | 984 | mutex_init(&ubi->device_mutex); |
f399d4a2 | 985 | spin_lock_init(&ubi->volumes_lock); |
0195a7bb HS |
986 | init_rwsem(&ubi->fm_protect); |
987 | init_rwsem(&ubi->fm_eba_sem); | |
f399d4a2 | 988 | |
0195a7bb | 989 | ubi_msg(ubi, "attaching mtd%d", mtd->index); |
f399d4a2 | 990 | |
ff94bc40 | 991 | err = io_init(ubi, max_beb_per1024); |
f399d4a2 KP |
992 | if (err) |
993 | goto out_free; | |
994 | ||
81732935 | 995 | err = -ENOMEM; |
ff94bc40 HS |
996 | ubi->peb_buf = vmalloc(ubi->peb_size); |
997 | if (!ubi->peb_buf) | |
f399d4a2 KP |
998 | goto out_free; |
999 | ||
ff94bc40 HS |
1000 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1001 | ubi->fm_size = ubi_calc_fm_size(ubi); | |
1002 | ubi->fm_buf = vzalloc(ubi->fm_size); | |
1003 | if (!ubi->fm_buf) | |
81732935 | 1004 | goto out_free; |
f399d4a2 | 1005 | #endif |
ff94bc40 | 1006 | err = ubi_attach(ubi, 0); |
f399d4a2 | 1007 | if (err) { |
0195a7bb HS |
1008 | ubi_err(ubi, "failed to attach mtd%d, error %d", |
1009 | mtd->index, err); | |
f399d4a2 KP |
1010 | goto out_free; |
1011 | } | |
1012 | ||
1013 | if (ubi->autoresize_vol_id != -1) { | |
1014 | err = autoresize(ubi, ubi->autoresize_vol_id); | |
1015 | if (err) | |
1016 | goto out_detach; | |
1017 | } | |
1018 | ||
ff94bc40 | 1019 | err = uif_init(ubi, &ref); |
f399d4a2 KP |
1020 | if (err) |
1021 | goto out_detach; | |
1022 | ||
ff94bc40 HS |
1023 | err = ubi_debugfs_init_dev(ubi); |
1024 | if (err) | |
1025 | goto out_uif; | |
1026 | ||
1027 | ubi->bgt_thread = kthread_create(ubi_thread, ubi, "%s", ubi->bgt_name); | |
f399d4a2 KP |
1028 | if (IS_ERR(ubi->bgt_thread)) { |
1029 | err = PTR_ERR(ubi->bgt_thread); | |
0195a7bb HS |
1030 | ubi_err(ubi, "cannot spawn \"%s\", error %d", |
1031 | ubi->bgt_name, err); | |
ff94bc40 | 1032 | goto out_debugfs; |
f399d4a2 KP |
1033 | } |
1034 | ||
0195a7bb HS |
1035 | ubi_msg(ubi, "attached mtd%d (name \"%s\", size %llu MiB)", |
1036 | mtd->index, mtd->name, ubi->flash_size >> 20); | |
1037 | ubi_msg(ubi, "PEB size: %d bytes (%d KiB), LEB size: %d bytes", | |
ff94bc40 | 1038 | ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size); |
0195a7bb | 1039 | ubi_msg(ubi, "min./max. I/O unit sizes: %d/%d, sub-page size %d", |
ff94bc40 | 1040 | ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size); |
0195a7bb | 1041 | ubi_msg(ubi, "VID header offset: %d (aligned %d), data offset: %d", |
ff94bc40 | 1042 | ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start); |
0195a7bb | 1043 | ubi_msg(ubi, "good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d", |
ff94bc40 | 1044 | ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count); |
0195a7bb | 1045 | ubi_msg(ubi, "user volume: %d, internal volumes: %d, max. volumes count: %d", |
ff94bc40 HS |
1046 | ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT, |
1047 | ubi->vtbl_slots); | |
0195a7bb | 1048 | ubi_msg(ubi, "max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u", |
ff94bc40 HS |
1049 | ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD, |
1050 | ubi->image_seq); | |
0195a7bb | 1051 | ubi_msg(ubi, "available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d", |
ff94bc40 HS |
1052 | ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs); |
1053 | ||
1054 | /* | |
1055 | * The below lock makes sure we do not race with 'ubi_thread()' which | |
1056 | * checks @ubi->thread_enabled. Otherwise we may fail to wake it up. | |
1057 | */ | |
1058 | spin_lock(&ubi->wl_lock); | |
1059 | ubi->thread_enabled = 1; | |
0195a7bb | 1060 | #ifndef __UBOOT__ |
ff94bc40 | 1061 | wake_up_process(ubi->bgt_thread); |
0195a7bb | 1062 | #else |
f82290af | 1063 | ubi_do_worker(ubi); |
0195a7bb HS |
1064 | #endif |
1065 | ||
ff94bc40 | 1066 | spin_unlock(&ubi->wl_lock); |
f399d4a2 KP |
1067 | |
1068 | ubi_devices[ubi_num] = ubi; | |
ff94bc40 | 1069 | ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL); |
f399d4a2 KP |
1070 | return ubi_num; |
1071 | ||
ff94bc40 HS |
1072 | out_debugfs: |
1073 | ubi_debugfs_exit_dev(ubi); | |
f399d4a2 | 1074 | out_uif: |
ff94bc40 HS |
1075 | get_device(&ubi->dev); |
1076 | ubi_assert(ref); | |
f399d4a2 KP |
1077 | uif_close(ubi); |
1078 | out_detach: | |
f399d4a2 | 1079 | ubi_wl_close(ubi); |
ff94bc40 | 1080 | ubi_free_internal_volumes(ubi); |
f399d4a2 KP |
1081 | vfree(ubi->vtbl); |
1082 | out_free: | |
ff94bc40 HS |
1083 | vfree(ubi->peb_buf); |
1084 | vfree(ubi->fm_buf); | |
1085 | if (ref) | |
1086 | put_device(&ubi->dev); | |
1087 | else | |
1088 | kfree(ubi); | |
f399d4a2 KP |
1089 | return err; |
1090 | } | |
1091 | ||
1092 | /** | |
1093 | * ubi_detach_mtd_dev - detach an MTD device. | |
1094 | * @ubi_num: UBI device number to detach from | |
1095 | * @anyway: detach MTD even if device reference count is not zero | |
1096 | * | |
1097 | * This function destroys an UBI device number @ubi_num and detaches the | |
1098 | * underlying MTD device. Returns zero in case of success and %-EBUSY if the | |
1099 | * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not | |
1100 | * exist. | |
1101 | * | |
1102 | * Note, the invocations of this function has to be serialized by the | |
1103 | * @ubi_devices_mutex. | |
1104 | */ | |
1105 | int ubi_detach_mtd_dev(int ubi_num, int anyway) | |
1106 | { | |
1107 | struct ubi_device *ubi; | |
1108 | ||
1109 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
1110 | return -EINVAL; | |
1111 | ||
ff94bc40 HS |
1112 | ubi = ubi_get_device(ubi_num); |
1113 | if (!ubi) | |
f399d4a2 | 1114 | return -EINVAL; |
f399d4a2 | 1115 | |
ff94bc40 HS |
1116 | spin_lock(&ubi_devices_lock); |
1117 | put_device(&ubi->dev); | |
1118 | ubi->ref_count -= 1; | |
f399d4a2 KP |
1119 | if (ubi->ref_count) { |
1120 | if (!anyway) { | |
1121 | spin_unlock(&ubi_devices_lock); | |
1122 | return -EBUSY; | |
1123 | } | |
1124 | /* This may only happen if there is a bug */ | |
0195a7bb | 1125 | ubi_err(ubi, "%s reference count %d, destroy anyway", |
f399d4a2 KP |
1126 | ubi->ubi_name, ubi->ref_count); |
1127 | } | |
1128 | ubi_devices[ubi_num] = NULL; | |
1129 | spin_unlock(&ubi_devices_lock); | |
1130 | ||
1131 | ubi_assert(ubi_num == ubi->ubi_num); | |
ff94bc40 | 1132 | ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL); |
0195a7bb | 1133 | ubi_msg(ubi, "detaching mtd%d", ubi->mtd->index); |
ff94bc40 HS |
1134 | #ifdef CONFIG_MTD_UBI_FASTMAP |
1135 | /* If we don't write a new fastmap at detach time we lose all | |
0195a7bb HS |
1136 | * EC updates that have been made since the last written fastmap. |
1137 | * In case of fastmap debugging we omit the update to simulate an | |
1138 | * unclean shutdown. */ | |
1139 | if (!ubi_dbg_chk_fastmap(ubi)) | |
1140 | ubi_update_fastmap(ubi); | |
ff94bc40 | 1141 | #endif |
f399d4a2 KP |
1142 | /* |
1143 | * Before freeing anything, we have to stop the background thread to | |
1144 | * prevent it from doing anything on this device while we are freeing. | |
1145 | */ | |
1146 | if (ubi->bgt_thread) | |
1147 | kthread_stop(ubi->bgt_thread); | |
1148 | ||
ff94bc40 HS |
1149 | /* |
1150 | * Get a reference to the device in order to prevent 'dev_release()' | |
1151 | * from freeing the @ubi object. | |
1152 | */ | |
1153 | get_device(&ubi->dev); | |
1154 | ||
1155 | ubi_debugfs_exit_dev(ubi); | |
f399d4a2 | 1156 | uif_close(ubi); |
ff94bc40 | 1157 | |
f399d4a2 | 1158 | ubi_wl_close(ubi); |
ff94bc40 | 1159 | ubi_free_internal_volumes(ubi); |
f399d4a2 KP |
1160 | vfree(ubi->vtbl); |
1161 | put_mtd_device(ubi->mtd); | |
ff94bc40 HS |
1162 | vfree(ubi->peb_buf); |
1163 | vfree(ubi->fm_buf); | |
0195a7bb | 1164 | ubi_msg(ubi, "mtd%d is detached", ubi->mtd->index); |
ff94bc40 | 1165 | put_device(&ubi->dev); |
f399d4a2 KP |
1166 | return 0; |
1167 | } | |
1168 | ||
ff94bc40 | 1169 | #ifndef __UBOOT__ |
f399d4a2 | 1170 | /** |
ff94bc40 HS |
1171 | * open_mtd_by_chdev - open an MTD device by its character device node path. |
1172 | * @mtd_dev: MTD character device node path | |
1173 | * | |
1174 | * This helper function opens an MTD device by its character node device path. | |
1175 | * Returns MTD device description object in case of success and a negative | |
1176 | * error code in case of failure. | |
1177 | */ | |
1178 | static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev) | |
1179 | { | |
1180 | int err, major, minor, mode; | |
1181 | struct path path; | |
1182 | ||
1183 | /* Probably this is an MTD character device node path */ | |
1184 | err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path); | |
1185 | if (err) | |
1186 | return ERR_PTR(err); | |
1187 | ||
1188 | /* MTD device number is defined by the major / minor numbers */ | |
0195a7bb HS |
1189 | major = imajor(d_backing_inode(path.dentry)); |
1190 | minor = iminor(d_backing_inode(path.dentry)); | |
1191 | mode = d_backing_inode(path.dentry)->i_mode; | |
ff94bc40 HS |
1192 | path_put(&path); |
1193 | if (major != MTD_CHAR_MAJOR || !S_ISCHR(mode)) | |
1194 | return ERR_PTR(-EINVAL); | |
1195 | ||
1196 | if (minor & 1) | |
1197 | /* | |
1198 | * Just do not think the "/dev/mtdrX" devices support is need, | |
1199 | * so do not support them to avoid doing extra work. | |
1200 | */ | |
1201 | return ERR_PTR(-EINVAL); | |
1202 | ||
1203 | return get_mtd_device(NULL, minor / 2); | |
1204 | } | |
1205 | #endif | |
1206 | ||
1207 | /** | |
1208 | * open_mtd_device - open MTD device by name, character device path, or number. | |
1209 | * @mtd_dev: name, character device node path, or MTD device device number | |
f399d4a2 KP |
1210 | * |
1211 | * This function tries to open and MTD device described by @mtd_dev string, | |
ff94bc40 HS |
1212 | * which is first treated as ASCII MTD device number, and if it is not true, it |
1213 | * is treated as MTD device name, and if that is also not true, it is treated | |
1214 | * as MTD character device node path. Returns MTD device description object in | |
1215 | * case of success and a negative error code in case of failure. | |
f399d4a2 KP |
1216 | */ |
1217 | static struct mtd_info * __init open_mtd_device(const char *mtd_dev) | |
1218 | { | |
1219 | struct mtd_info *mtd; | |
1220 | int mtd_num; | |
1221 | char *endp; | |
1222 | ||
1223 | mtd_num = simple_strtoul(mtd_dev, &endp, 0); | |
1224 | if (*endp != '\0' || mtd_dev == endp) { | |
1225 | /* | |
1226 | * This does not look like an ASCII integer, probably this is | |
1227 | * MTD device name. | |
1228 | */ | |
1229 | mtd = get_mtd_device_nm(mtd_dev); | |
ff94bc40 HS |
1230 | #ifndef __UBOOT__ |
1231 | if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV) | |
1232 | /* Probably this is an MTD character device node path */ | |
1233 | mtd = open_mtd_by_chdev(mtd_dev); | |
1234 | #endif | |
f399d4a2 KP |
1235 | } else |
1236 | mtd = get_mtd_device(NULL, mtd_num); | |
1237 | ||
1238 | return mtd; | |
1239 | } | |
1240 | ||
ff94bc40 HS |
1241 | #ifndef __UBOOT__ |
1242 | static int __init ubi_init(void) | |
1243 | #else | |
1244 | int ubi_init(void) | |
1245 | #endif | |
f399d4a2 KP |
1246 | { |
1247 | int err, i, k; | |
1248 | ||
1249 | /* Ensure that EC and VID headers have correct size */ | |
1250 | BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64); | |
1251 | BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64); | |
1252 | ||
1253 | if (mtd_devs > UBI_MAX_DEVICES) { | |
0195a7bb HS |
1254 | pr_err("UBI error: too many MTD devices, maximum is %d", |
1255 | UBI_MAX_DEVICES); | |
f399d4a2 KP |
1256 | return -EINVAL; |
1257 | } | |
1258 | ||
1259 | /* Create base sysfs directory and sysfs files */ | |
0195a7bb HS |
1260 | err = class_register(&ubi_class); |
1261 | if (err < 0) | |
1262 | return err; | |
f399d4a2 KP |
1263 | |
1264 | err = misc_register(&ubi_ctrl_cdev); | |
1265 | if (err) { | |
0195a7bb HS |
1266 | pr_err("UBI error: cannot register device"); |
1267 | goto out; | |
f399d4a2 KP |
1268 | } |
1269 | ||
f399d4a2 KP |
1270 | ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab", |
1271 | sizeof(struct ubi_wl_entry), | |
1272 | 0, 0, NULL); | |
ff94bc40 HS |
1273 | if (!ubi_wl_entry_slab) { |
1274 | err = -ENOMEM; | |
f399d4a2 | 1275 | goto out_dev_unreg; |
ff94bc40 HS |
1276 | } |
1277 | ||
1278 | err = ubi_debugfs_init(); | |
1279 | if (err) | |
1280 | goto out_slab; | |
1281 | ||
f399d4a2 KP |
1282 | |
1283 | /* Attach MTD devices */ | |
1284 | for (i = 0; i < mtd_devs; i++) { | |
1285 | struct mtd_dev_param *p = &mtd_dev_param[i]; | |
1286 | struct mtd_info *mtd; | |
1287 | ||
1288 | cond_resched(); | |
1289 | ||
1290 | mtd = open_mtd_device(p->name); | |
1291 | if (IS_ERR(mtd)) { | |
1292 | err = PTR_ERR(mtd); | |
0195a7bb HS |
1293 | pr_err("UBI error: cannot open mtd %s, error %d", |
1294 | p->name, err); | |
ff94bc40 HS |
1295 | /* See comment below re-ubi_is_module(). */ |
1296 | if (ubi_is_module()) | |
1297 | goto out_detach; | |
1298 | continue; | |
f399d4a2 KP |
1299 | } |
1300 | ||
1301 | mutex_lock(&ubi_devices_mutex); | |
ff94bc40 HS |
1302 | err = ubi_attach_mtd_dev(mtd, p->ubi_num, |
1303 | p->vid_hdr_offs, p->max_beb_per1024); | |
f399d4a2 KP |
1304 | mutex_unlock(&ubi_devices_mutex); |
1305 | if (err < 0) { | |
0195a7bb HS |
1306 | pr_err("UBI error: cannot attach mtd%d", |
1307 | mtd->index); | |
ff94bc40 HS |
1308 | put_mtd_device(mtd); |
1309 | ||
1310 | /* | |
1311 | * Originally UBI stopped initializing on any error. | |
1312 | * However, later on it was found out that this | |
1313 | * behavior is not very good when UBI is compiled into | |
1314 | * the kernel and the MTD devices to attach are passed | |
1315 | * through the command line. Indeed, UBI failure | |
1316 | * stopped whole boot sequence. | |
1317 | * | |
1318 | * To fix this, we changed the behavior for the | |
1319 | * non-module case, but preserved the old behavior for | |
1320 | * the module case, just for compatibility. This is a | |
1321 | * little inconsistent, though. | |
1322 | */ | |
1323 | if (ubi_is_module()) | |
1324 | goto out_detach; | |
f399d4a2 KP |
1325 | } |
1326 | } | |
1327 | ||
4e67c571 HS |
1328 | err = ubiblock_init(); |
1329 | if (err) { | |
0195a7bb | 1330 | pr_err("UBI error: block: cannot initialize, error %d", err); |
4e67c571 HS |
1331 | |
1332 | /* See comment above re-ubi_is_module(). */ | |
1333 | if (ubi_is_module()) | |
1334 | goto out_detach; | |
1335 | } | |
1336 | ||
f399d4a2 KP |
1337 | return 0; |
1338 | ||
1339 | out_detach: | |
1340 | for (k = 0; k < i; k++) | |
1341 | if (ubi_devices[k]) { | |
1342 | mutex_lock(&ubi_devices_mutex); | |
1343 | ubi_detach_mtd_dev(ubi_devices[k]->ubi_num, 1); | |
1344 | mutex_unlock(&ubi_devices_mutex); | |
1345 | } | |
ff94bc40 HS |
1346 | ubi_debugfs_exit(); |
1347 | out_slab: | |
f399d4a2 KP |
1348 | kmem_cache_destroy(ubi_wl_entry_slab); |
1349 | out_dev_unreg: | |
f399d4a2 | 1350 | misc_deregister(&ubi_ctrl_cdev); |
f399d4a2 | 1351 | out: |
40da2a2a HS |
1352 | #ifdef __UBOOT__ |
1353 | /* Reset any globals that the driver depends on being zeroed */ | |
1354 | mtd_devs = 0; | |
1355 | #endif | |
0195a7bb HS |
1356 | class_unregister(&ubi_class); |
1357 | pr_err("UBI error: cannot initialize UBI, error %d", err); | |
f399d4a2 KP |
1358 | return err; |
1359 | } | |
ff94bc40 | 1360 | late_initcall(ubi_init); |
f399d4a2 | 1361 | |
ff94bc40 HS |
1362 | #ifndef __UBOOT__ |
1363 | static void __exit ubi_exit(void) | |
1364 | #else | |
1365 | void ubi_exit(void) | |
1366 | #endif | |
f399d4a2 KP |
1367 | { |
1368 | int i; | |
1369 | ||
4e67c571 HS |
1370 | ubiblock_exit(); |
1371 | ||
f399d4a2 KP |
1372 | for (i = 0; i < UBI_MAX_DEVICES; i++) |
1373 | if (ubi_devices[i]) { | |
1374 | mutex_lock(&ubi_devices_mutex); | |
1375 | ubi_detach_mtd_dev(ubi_devices[i]->ubi_num, 1); | |
1376 | mutex_unlock(&ubi_devices_mutex); | |
1377 | } | |
ff94bc40 | 1378 | ubi_debugfs_exit(); |
f399d4a2 KP |
1379 | kmem_cache_destroy(ubi_wl_entry_slab); |
1380 | misc_deregister(&ubi_ctrl_cdev); | |
0195a7bb | 1381 | class_unregister(&ubi_class); |
40da2a2a HS |
1382 | #ifdef __UBOOT__ |
1383 | /* Reset any globals that the driver depends on being zeroed */ | |
1384 | mtd_devs = 0; | |
1385 | #endif | |
f399d4a2 KP |
1386 | } |
1387 | module_exit(ubi_exit); | |
1388 | ||
1389 | /** | |
ff94bc40 | 1390 | * bytes_str_to_int - convert a number of bytes string into an integer. |
f399d4a2 KP |
1391 | * @str: the string to convert |
1392 | * | |
1393 | * This function returns positive resulting integer in case of success and a | |
1394 | * negative error code in case of failure. | |
1395 | */ | |
1396 | static int __init bytes_str_to_int(const char *str) | |
1397 | { | |
1398 | char *endp; | |
1399 | unsigned long result; | |
1400 | ||
1401 | result = simple_strtoul(str, &endp, 0); | |
ff94bc40 | 1402 | if (str == endp || result >= INT_MAX) { |
0195a7bb | 1403 | pr_err("UBI error: incorrect bytes count: \"%s\"\n", str); |
f399d4a2 KP |
1404 | return -EINVAL; |
1405 | } | |
1406 | ||
1407 | switch (*endp) { | |
1408 | case 'G': | |
1409 | result *= 1024; | |
1410 | case 'M': | |
1411 | result *= 1024; | |
1412 | case 'K': | |
1413 | result *= 1024; | |
1414 | if (endp[1] == 'i' && endp[2] == 'B') | |
1415 | endp += 2; | |
1416 | case '\0': | |
1417 | break; | |
1418 | default: | |
0195a7bb | 1419 | pr_err("UBI error: incorrect bytes count: \"%s\"\n", str); |
f399d4a2 KP |
1420 | return -EINVAL; |
1421 | } | |
1422 | ||
1423 | return result; | |
1424 | } | |
1425 | ||
ff94bc40 HS |
1426 | int kstrtoint(const char *s, unsigned int base, int *res) |
1427 | { | |
1428 | unsigned long long tmp; | |
1429 | ||
1430 | tmp = simple_strtoull(s, NULL, base); | |
1431 | if (tmp != (unsigned long long)(int)tmp) | |
1432 | return -ERANGE; | |
1433 | ||
1434 | return (int)tmp; | |
1435 | } | |
1436 | ||
f399d4a2 KP |
1437 | /** |
1438 | * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter. | |
1439 | * @val: the parameter value to parse | |
1440 | * @kp: not used | |
1441 | * | |
1442 | * This function returns zero in case of success and a negative error code in | |
1443 | * case of error. | |
1444 | */ | |
ff94bc40 HS |
1445 | #ifndef __UBOOT__ |
1446 | static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp) | |
1447 | #else | |
1448 | int ubi_mtd_param_parse(const char *val, struct kernel_param *kp) | |
1449 | #endif | |
f399d4a2 KP |
1450 | { |
1451 | int i, len; | |
1452 | struct mtd_dev_param *p; | |
1453 | char buf[MTD_PARAM_LEN_MAX]; | |
1454 | char *pbuf = &buf[0]; | |
ff94bc40 | 1455 | char *tokens[MTD_PARAM_MAX_COUNT], *token; |
f399d4a2 KP |
1456 | |
1457 | if (!val) | |
1458 | return -EINVAL; | |
1459 | ||
1460 | if (mtd_devs == UBI_MAX_DEVICES) { | |
0195a7bb HS |
1461 | pr_err("UBI error: too many parameters, max. is %d\n", |
1462 | UBI_MAX_DEVICES); | |
f399d4a2 KP |
1463 | return -EINVAL; |
1464 | } | |
1465 | ||
1466 | len = strnlen(val, MTD_PARAM_LEN_MAX); | |
1467 | if (len == MTD_PARAM_LEN_MAX) { | |
0195a7bb HS |
1468 | pr_err("UBI error: parameter \"%s\" is too long, max. is %d\n", |
1469 | val, MTD_PARAM_LEN_MAX); | |
f399d4a2 KP |
1470 | return -EINVAL; |
1471 | } | |
1472 | ||
1473 | if (len == 0) { | |
ff94bc40 | 1474 | pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n"); |
f399d4a2 KP |
1475 | return 0; |
1476 | } | |
1477 | ||
1478 | strcpy(buf, val); | |
1479 | ||
1480 | /* Get rid of the final newline */ | |
1481 | if (buf[len - 1] == '\n') | |
1482 | buf[len - 1] = '\0'; | |
1483 | ||
ff94bc40 | 1484 | for (i = 0; i < MTD_PARAM_MAX_COUNT; i++) |
f399d4a2 KP |
1485 | tokens[i] = strsep(&pbuf, ","); |
1486 | ||
1487 | if (pbuf) { | |
0195a7bb | 1488 | pr_err("UBI error: too many arguments at \"%s\"\n", val); |
f399d4a2 KP |
1489 | return -EINVAL; |
1490 | } | |
1491 | ||
1492 | p = &mtd_dev_param[mtd_devs]; | |
1493 | strcpy(&p->name[0], tokens[0]); | |
1494 | ||
ff94bc40 HS |
1495 | token = tokens[1]; |
1496 | if (token) { | |
1497 | p->vid_hdr_offs = bytes_str_to_int(token); | |
1498 | ||
1499 | if (p->vid_hdr_offs < 0) | |
1500 | return p->vid_hdr_offs; | |
1501 | } | |
f399d4a2 | 1502 | |
ff94bc40 HS |
1503 | token = tokens[2]; |
1504 | if (token) { | |
1505 | int err = kstrtoint(token, 10, &p->max_beb_per1024); | |
1506 | ||
1507 | if (err) { | |
0195a7bb HS |
1508 | pr_err("UBI error: bad value for max_beb_per1024 parameter: %s", |
1509 | token); | |
ff94bc40 HS |
1510 | return -EINVAL; |
1511 | } | |
1512 | } | |
1513 | ||
1514 | token = tokens[3]; | |
1515 | if (token) { | |
1516 | int err = kstrtoint(token, 10, &p->ubi_num); | |
1517 | ||
1518 | if (err) { | |
0195a7bb HS |
1519 | pr_err("UBI error: bad value for ubi_num parameter: %s", |
1520 | token); | |
ff94bc40 HS |
1521 | return -EINVAL; |
1522 | } | |
1523 | } else | |
1524 | p->ubi_num = UBI_DEV_NUM_AUTO; | |
f399d4a2 KP |
1525 | |
1526 | mtd_devs += 1; | |
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000); | |
ff94bc40 | 1531 | MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024[,ubi_num]]].\n" |
f399d4a2 | 1532 | "Multiple \"mtd\" parameters may be specified.\n" |
ff94bc40 HS |
1533 | "MTD devices may be specified by their number, name, or path to the MTD character device node.\n" |
1534 | "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n" | |
1535 | "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value (" | |
1536 | __stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n" | |
1537 | "Optional \"ubi_num\" parameter specifies UBI device number which have to be assigned to the newly created UBI device (assigned automatically by default)\n" | |
1538 | "\n" | |
1539 | "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n" | |
1540 | "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" | |
1541 | "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" | |
1542 | "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" | |
1543 | "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device)."); | |
1544 | #ifdef CONFIG_MTD_UBI_FASTMAP | |
1545 | module_param(fm_autoconvert, bool, 0644); | |
1546 | MODULE_PARM_DESC(fm_autoconvert, "Set this parameter to enable fastmap automatically on images without a fastmap."); | |
0195a7bb HS |
1547 | module_param(fm_debug, bool, 0); |
1548 | MODULE_PARM_DESC(fm_debug, "Set this parameter to enable fastmap debugging by default. Warning, this will make fastmap slow!"); | |
ff94bc40 | 1549 | #endif |
f399d4a2 KP |
1550 | MODULE_VERSION(__stringify(UBI_VERSION)); |
1551 | MODULE_DESCRIPTION("UBI - Unsorted Block Images"); | |
1552 | MODULE_AUTHOR("Artem Bityutskiy"); | |
1553 | MODULE_LICENSE("GPL"); |