2 * Copyright (c) International Business Machines Corp., 2006
3 * Copyright (c) Nokia Corporation, 2007
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * Author: Artem Bityutskiy (Битюцкий Артём),
24 * This file includes UBI initialization and building of UBI devices.
26 * When UBI is initialized, it attaches all the MTD devices specified as the
27 * module load parameters or the kernel boot parameters. If MTD devices were
28 * specified, UBI does not attach any MTD device, but it is possible to do
29 * later using the "UBI control device".
32 #include <linux/err.h>
33 #include <linux/module.h>
34 #include <linux/moduleparam.h>
35 #include <linux/stringify.h>
36 #include <linux/namei.h>
37 #include <linux/stat.h>
38 #include <linux/miscdevice.h>
39 #include <linux/mtd/partitions.h>
40 #include <linux/log2.h>
41 #include <linux/kthread.h>
42 #include <linux/kernel.h>
43 #include <linux/slab.h>
46 /* Maximum length of the 'mtd=' parameter */
47 #define MTD_PARAM_LEN_MAX 64
49 /* Maximum number of comma-separated items in the 'mtd=' parameter */
50 #define MTD_PARAM_MAX_COUNT 3
52 /* Maximum value for the number of bad PEBs per 1024 PEBs */
53 #define MAX_MTD_UBI_BEB_LIMIT 768
55 #ifdef CONFIG_MTD_UBI_MODULE
56 #define ubi_is_module() 1
58 #define ubi_is_module() 0
62 * struct mtd_dev_param - MTD device parameter description data structure.
63 * @name: MTD character device node path, MTD device name, or MTD device number
65 * @vid_hdr_offs: VID header offset
66 * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs
68 struct mtd_dev_param
{
69 char name
[MTD_PARAM_LEN_MAX
];
74 /* Numbers of elements set in the @mtd_dev_param array */
75 static int __initdata mtd_devs
;
77 /* MTD devices specification parameters */
78 static struct mtd_dev_param __initdata mtd_dev_param
[UBI_MAX_DEVICES
];
79 #ifdef CONFIG_MTD_UBI_FASTMAP
80 /* UBI module parameter to enable fastmap automatically on non-fastmap images */
81 static bool fm_autoconvert
;
83 /* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
84 struct class *ubi_class
;
86 /* Slab cache for wear-leveling entries */
87 struct kmem_cache
*ubi_wl_entry_slab
;
89 /* UBI control character device */
90 static struct miscdevice ubi_ctrl_cdev
= {
91 .minor
= MISC_DYNAMIC_MINOR
,
93 .fops
= &ubi_ctrl_cdev_operations
,
96 /* All UBI devices in system */
97 static struct ubi_device
*ubi_devices
[UBI_MAX_DEVICES
];
99 /* Serializes UBI devices creations and removals */
100 DEFINE_MUTEX(ubi_devices_mutex
);
102 /* Protects @ubi_devices and @ubi->ref_count */
103 static DEFINE_SPINLOCK(ubi_devices_lock
);
105 /* "Show" method for files in '/<sysfs>/class/ubi/' */
106 static ssize_t
ubi_version_show(struct class *class,
107 struct class_attribute
*attr
, char *buf
)
109 return sprintf(buf
, "%d\n", UBI_VERSION
);
112 /* UBI version attribute ('/<sysfs>/class/ubi/version') */
113 static struct class_attribute ubi_version
=
114 __ATTR(version
, S_IRUGO
, ubi_version_show
, NULL
);
116 static ssize_t
dev_attribute_show(struct device
*dev
,
117 struct device_attribute
*attr
, char *buf
);
119 /* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */
120 static struct device_attribute dev_eraseblock_size
=
121 __ATTR(eraseblock_size
, S_IRUGO
, dev_attribute_show
, NULL
);
122 static struct device_attribute dev_avail_eraseblocks
=
123 __ATTR(avail_eraseblocks
, S_IRUGO
, dev_attribute_show
, NULL
);
124 static struct device_attribute dev_total_eraseblocks
=
125 __ATTR(total_eraseblocks
, S_IRUGO
, dev_attribute_show
, NULL
);
126 static struct device_attribute dev_volumes_count
=
127 __ATTR(volumes_count
, S_IRUGO
, dev_attribute_show
, NULL
);
128 static struct device_attribute dev_max_ec
=
129 __ATTR(max_ec
, S_IRUGO
, dev_attribute_show
, NULL
);
130 static struct device_attribute dev_reserved_for_bad
=
131 __ATTR(reserved_for_bad
, S_IRUGO
, dev_attribute_show
, NULL
);
132 static struct device_attribute dev_bad_peb_count
=
133 __ATTR(bad_peb_count
, S_IRUGO
, dev_attribute_show
, NULL
);
134 static struct device_attribute dev_max_vol_count
=
135 __ATTR(max_vol_count
, S_IRUGO
, dev_attribute_show
, NULL
);
136 static struct device_attribute dev_min_io_size
=
137 __ATTR(min_io_size
, S_IRUGO
, dev_attribute_show
, NULL
);
138 static struct device_attribute dev_bgt_enabled
=
139 __ATTR(bgt_enabled
, S_IRUGO
, dev_attribute_show
, NULL
);
140 static struct device_attribute dev_mtd_num
=
141 __ATTR(mtd_num
, S_IRUGO
, dev_attribute_show
, NULL
);
144 * ubi_volume_notify - send a volume change notification.
145 * @ubi: UBI device description object
146 * @vol: volume description object of the changed volume
147 * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
149 * This is a helper function which notifies all subscribers about a volume
150 * change event (creation, removal, re-sizing, re-naming, updating). Returns
151 * zero in case of success and a negative error code in case of failure.
153 int ubi_volume_notify(struct ubi_device
*ubi
, struct ubi_volume
*vol
, int ntype
)
155 struct ubi_notification nt
;
157 ubi_do_get_device_info(ubi
, &nt
.di
);
158 ubi_do_get_volume_info(ubi
, vol
, &nt
.vi
);
160 #ifdef CONFIG_MTD_UBI_FASTMAP
162 case UBI_VOLUME_ADDED
:
163 case UBI_VOLUME_REMOVED
:
164 case UBI_VOLUME_RESIZED
:
165 case UBI_VOLUME_RENAMED
:
166 if (ubi_update_fastmap(ubi
)) {
167 ubi_err("Unable to update fastmap!");
172 return blocking_notifier_call_chain(&ubi_notifiers
, ntype
, &nt
);
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
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.
186 int ubi_notify_all(struct ubi_device
*ubi
, int ntype
, struct notifier_block
*nb
)
188 struct ubi_notification nt
;
191 ubi_do_get_device_info(ubi
, &nt
.di
);
193 mutex_lock(&ubi
->device_mutex
);
194 for (i
= 0; i
< ubi
->vtbl_slots
; i
++) {
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.
200 if (!ubi
->volumes
[i
])
203 ubi_do_get_volume_info(ubi
, ubi
->volumes
[i
], &nt
.vi
);
205 nb
->notifier_call(nb
, ntype
, &nt
);
207 blocking_notifier_call_chain(&ubi_notifiers
, ntype
,
211 mutex_unlock(&ubi
->device_mutex
);
217 * ubi_enumerate_volumes - send "add" notification for all existing volumes.
218 * @nb: the notifier to call
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.
225 int ubi_enumerate_volumes(struct notifier_block
*nb
)
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.
233 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
234 struct ubi_device
*ubi
= ubi_devices
[i
];
238 count
+= ubi_notify_all(ubi
, UBI_VOLUME_ADDED
, nb
);
245 * ubi_get_device - get UBI device.
246 * @ubi_num: UBI device number
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.
253 struct ubi_device
*ubi_get_device(int ubi_num
)
255 struct ubi_device
*ubi
;
257 spin_lock(&ubi_devices_lock
);
258 ubi
= ubi_devices
[ubi_num
];
260 ubi_assert(ubi
->ref_count
>= 0);
262 get_device(&ubi
->dev
);
264 spin_unlock(&ubi_devices_lock
);
270 * ubi_put_device - drop an UBI device reference.
271 * @ubi: UBI device description object
273 void ubi_put_device(struct ubi_device
*ubi
)
275 spin_lock(&ubi_devices_lock
);
277 put_device(&ubi
->dev
);
278 spin_unlock(&ubi_devices_lock
);
282 * ubi_get_by_major - get UBI device by character device major number.
283 * @major: major number
285 * This function is similar to 'ubi_get_device()', but it searches the device
286 * by its major number.
288 struct ubi_device
*ubi_get_by_major(int major
)
291 struct ubi_device
*ubi
;
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);
299 get_device(&ubi
->dev
);
300 spin_unlock(&ubi_devices_lock
);
304 spin_unlock(&ubi_devices_lock
);
310 * ubi_major2num - get UBI device number by character device major number.
311 * @major: major number
313 * This function searches UBI device number object by its major number. If UBI
314 * device was not found, this function returns -ENODEV, otherwise the UBI device
315 * number is returned.
317 int ubi_major2num(int major
)
319 int i
, ubi_num
= -ENODEV
;
321 spin_lock(&ubi_devices_lock
);
322 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
323 struct ubi_device
*ubi
= ubi_devices
[i
];
325 if (ubi
&& MAJOR(ubi
->cdev
.dev
) == major
) {
326 ubi_num
= ubi
->ubi_num
;
330 spin_unlock(&ubi_devices_lock
);
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
)
340 struct ubi_device
*ubi
;
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.
349 * Remember, 'struct ubi_device' is freed in the release function, so
350 * we still can use 'ubi->ubi_num'.
352 ubi
= container_of(dev
, struct ubi_device
, dev
);
353 ubi
= ubi_get_device(ubi
->ubi_num
);
357 if (attr
== &dev_eraseblock_size
)
358 ret
= sprintf(buf
, "%d\n", ubi
->leb_size
);
359 else if (attr
== &dev_avail_eraseblocks
)
360 ret
= sprintf(buf
, "%d\n", ubi
->avail_pebs
);
361 else if (attr
== &dev_total_eraseblocks
)
362 ret
= sprintf(buf
, "%d\n", ubi
->good_peb_count
);
363 else if (attr
== &dev_volumes_count
)
364 ret
= sprintf(buf
, "%d\n", ubi
->vol_count
- UBI_INT_VOL_COUNT
);
365 else if (attr
== &dev_max_ec
)
366 ret
= sprintf(buf
, "%d\n", ubi
->max_ec
);
367 else if (attr
== &dev_reserved_for_bad
)
368 ret
= sprintf(buf
, "%d\n", ubi
->beb_rsvd_pebs
);
369 else if (attr
== &dev_bad_peb_count
)
370 ret
= sprintf(buf
, "%d\n", ubi
->bad_peb_count
);
371 else if (attr
== &dev_max_vol_count
)
372 ret
= sprintf(buf
, "%d\n", ubi
->vtbl_slots
);
373 else if (attr
== &dev_min_io_size
)
374 ret
= sprintf(buf
, "%d\n", ubi
->min_io_size
);
375 else if (attr
== &dev_bgt_enabled
)
376 ret
= sprintf(buf
, "%d\n", ubi
->thread_enabled
);
377 else if (attr
== &dev_mtd_num
)
378 ret
= sprintf(buf
, "%d\n", ubi
->mtd
->index
);
386 static void dev_release(struct device
*dev
)
388 struct ubi_device
*ubi
= container_of(dev
, struct ubi_device
, dev
);
394 * ubi_sysfs_init - initialize sysfs for an UBI device.
395 * @ubi: UBI device description object
396 * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
399 * This function returns zero in case of success and a negative error code in
402 static int ubi_sysfs_init(struct ubi_device
*ubi
, int *ref
)
406 ubi
->dev
.release
= dev_release
;
407 ubi
->dev
.devt
= ubi
->cdev
.dev
;
408 ubi
->dev
.class = ubi_class
;
409 dev_set_name(&ubi
->dev
, UBI_NAME_STR
"%d", ubi
->ubi_num
);
410 err
= device_register(&ubi
->dev
);
415 err
= device_create_file(&ubi
->dev
, &dev_eraseblock_size
);
418 err
= device_create_file(&ubi
->dev
, &dev_avail_eraseblocks
);
421 err
= device_create_file(&ubi
->dev
, &dev_total_eraseblocks
);
424 err
= device_create_file(&ubi
->dev
, &dev_volumes_count
);
427 err
= device_create_file(&ubi
->dev
, &dev_max_ec
);
430 err
= device_create_file(&ubi
->dev
, &dev_reserved_for_bad
);
433 err
= device_create_file(&ubi
->dev
, &dev_bad_peb_count
);
436 err
= device_create_file(&ubi
->dev
, &dev_max_vol_count
);
439 err
= device_create_file(&ubi
->dev
, &dev_min_io_size
);
442 err
= device_create_file(&ubi
->dev
, &dev_bgt_enabled
);
445 err
= device_create_file(&ubi
->dev
, &dev_mtd_num
);
450 * ubi_sysfs_close - close sysfs for an UBI device.
451 * @ubi: UBI device description object
453 static void ubi_sysfs_close(struct ubi_device
*ubi
)
455 device_remove_file(&ubi
->dev
, &dev_mtd_num
);
456 device_remove_file(&ubi
->dev
, &dev_bgt_enabled
);
457 device_remove_file(&ubi
->dev
, &dev_min_io_size
);
458 device_remove_file(&ubi
->dev
, &dev_max_vol_count
);
459 device_remove_file(&ubi
->dev
, &dev_bad_peb_count
);
460 device_remove_file(&ubi
->dev
, &dev_reserved_for_bad
);
461 device_remove_file(&ubi
->dev
, &dev_max_ec
);
462 device_remove_file(&ubi
->dev
, &dev_volumes_count
);
463 device_remove_file(&ubi
->dev
, &dev_total_eraseblocks
);
464 device_remove_file(&ubi
->dev
, &dev_avail_eraseblocks
);
465 device_remove_file(&ubi
->dev
, &dev_eraseblock_size
);
466 device_unregister(&ubi
->dev
);
470 * kill_volumes - destroy all user volumes.
471 * @ubi: UBI device description object
473 static void kill_volumes(struct ubi_device
*ubi
)
477 for (i
= 0; i
< ubi
->vtbl_slots
; i
++)
479 ubi_free_volume(ubi
, ubi
->volumes
[i
]);
483 * uif_init - initialize user interfaces for an UBI device.
484 * @ubi: UBI device description object
485 * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
486 * taken, otherwise set to %0
488 * This function initializes various user interfaces for an UBI device. If the
489 * initialization fails at an early stage, this function frees all the
490 * resources it allocated, returns an error, and @ref is set to %0. However,
491 * if the initialization fails after the UBI device was registered in the
492 * driver core subsystem, this function takes a reference to @ubi->dev, because
493 * otherwise the release function ('dev_release()') would free whole @ubi
494 * object. The @ref argument is set to %1 in this case. The caller has to put
497 * This function returns zero in case of success and a negative error code in
500 static int uif_init(struct ubi_device
*ubi
, int *ref
)
506 sprintf(ubi
->ubi_name
, UBI_NAME_STR
"%d", ubi
->ubi_num
);
509 * Major numbers for the UBI character devices are allocated
510 * dynamically. Major numbers of volume character devices are
511 * equivalent to ones of the corresponding UBI character device. Minor
512 * numbers of UBI character devices are 0, while minor numbers of
513 * volume character devices start from 1. Thus, we allocate one major
514 * number and ubi->vtbl_slots + 1 minor numbers.
516 err
= alloc_chrdev_region(&dev
, 0, ubi
->vtbl_slots
+ 1, ubi
->ubi_name
);
518 ubi_err("cannot register UBI character devices");
522 ubi_assert(MINOR(dev
) == 0);
523 cdev_init(&ubi
->cdev
, &ubi_cdev_operations
);
524 dbg_gen("%s major is %u", ubi
->ubi_name
, MAJOR(dev
));
525 ubi
->cdev
.owner
= THIS_MODULE
;
527 err
= cdev_add(&ubi
->cdev
, dev
, 1);
529 ubi_err("cannot add character device");
533 err
= ubi_sysfs_init(ubi
, ref
);
537 for (i
= 0; i
< ubi
->vtbl_slots
; i
++)
538 if (ubi
->volumes
[i
]) {
539 err
= ubi_add_volume(ubi
, ubi
->volumes
[i
]);
541 ubi_err("cannot add volume %d", i
);
552 get_device(&ubi
->dev
);
553 ubi_sysfs_close(ubi
);
554 cdev_del(&ubi
->cdev
);
556 unregister_chrdev_region(ubi
->cdev
.dev
, ubi
->vtbl_slots
+ 1);
557 ubi_err("cannot initialize UBI %s, error %d", ubi
->ubi_name
, err
);
562 * uif_close - close user interfaces for an UBI device.
563 * @ubi: UBI device description object
565 * Note, since this function un-registers UBI volume device objects (@vol->dev),
566 * the memory allocated voe the volumes is freed as well (in the release
569 static void uif_close(struct ubi_device
*ubi
)
572 ubi_sysfs_close(ubi
);
573 cdev_del(&ubi
->cdev
);
574 unregister_chrdev_region(ubi
->cdev
.dev
, ubi
->vtbl_slots
+ 1);
578 * ubi_free_internal_volumes - free internal volumes.
579 * @ubi: UBI device description object
581 void ubi_free_internal_volumes(struct ubi_device
*ubi
)
585 for (i
= ubi
->vtbl_slots
;
586 i
< ubi
->vtbl_slots
+ UBI_INT_VOL_COUNT
; i
++) {
587 kfree(ubi
->volumes
[i
]->eba_tbl
);
588 kfree(ubi
->volumes
[i
]);
592 static int get_bad_peb_limit(const struct ubi_device
*ubi
, int max_beb_per1024
)
594 int limit
, device_pebs
;
595 uint64_t device_size
;
597 if (!max_beb_per1024
)
601 * Here we are using size of the entire flash chip and
602 * not just the MTD partition size because the maximum
603 * number of bad eraseblocks is a percentage of the
604 * whole device and bad eraseblocks are not fairly
605 * distributed over the flash chip. So the worst case
606 * is that all the bad eraseblocks of the chip are in
607 * the MTD partition we are attaching (ubi->mtd).
609 device_size
= mtd_get_device_size(ubi
->mtd
);
610 device_pebs
= mtd_div_by_eb(device_size
, ubi
->mtd
);
611 limit
= mult_frac(device_pebs
, max_beb_per1024
, 1024);
614 if (mult_frac(limit
, 1024, max_beb_per1024
) < device_pebs
)
621 * io_init - initialize I/O sub-system for a given UBI device.
622 * @ubi: UBI device description object
623 * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
625 * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
627 * o EC header is always at offset zero - this cannot be changed;
628 * o VID header starts just after the EC header at the closest address
629 * aligned to @io->hdrs_min_io_size;
630 * o data starts just after the VID header at the closest address aligned to
633 * This function returns zero in case of success and a negative error code in
636 static int io_init(struct ubi_device
*ubi
, int max_beb_per1024
)
638 dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb
));
639 dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry
));
641 if (ubi
->mtd
->numeraseregions
!= 0) {
643 * Some flashes have several erase regions. Different regions
644 * may have different eraseblock size and other
645 * characteristics. It looks like mostly multi-region flashes
646 * have one "main" region and one or more small regions to
647 * store boot loader code or boot parameters or whatever. I
648 * guess we should just pick the largest region. But this is
651 ubi_err("multiple regions, not implemented");
655 if (ubi
->vid_hdr_offset
< 0)
659 * Note, in this implementation we support MTD devices with 0x7FFFFFFF
660 * physical eraseblocks maximum.
663 ubi
->peb_size
= ubi
->mtd
->erasesize
;
664 ubi
->peb_count
= mtd_div_by_eb(ubi
->mtd
->size
, ubi
->mtd
);
665 ubi
->flash_size
= ubi
->mtd
->size
;
667 if (mtd_can_have_bb(ubi
->mtd
)) {
668 ubi
->bad_allowed
= 1;
669 ubi
->bad_peb_limit
= get_bad_peb_limit(ubi
, max_beb_per1024
);
672 if (ubi
->mtd
->type
== MTD_NORFLASH
) {
673 ubi_assert(ubi
->mtd
->writesize
== 1);
677 ubi
->min_io_size
= ubi
->mtd
->writesize
;
678 ubi
->hdrs_min_io_size
= ubi
->mtd
->writesize
>> ubi
->mtd
->subpage_sft
;
681 * Make sure minimal I/O unit is power of 2. Note, there is no
682 * fundamental reason for this assumption. It is just an optimization
683 * which allows us to avoid costly division operations.
685 if (!is_power_of_2(ubi
->min_io_size
)) {
686 ubi_err("min. I/O unit (%d) is not power of 2",
691 ubi_assert(ubi
->hdrs_min_io_size
> 0);
692 ubi_assert(ubi
->hdrs_min_io_size
<= ubi
->min_io_size
);
693 ubi_assert(ubi
->min_io_size
% ubi
->hdrs_min_io_size
== 0);
695 ubi
->max_write_size
= ubi
->mtd
->writebufsize
;
697 * Maximum write size has to be greater or equivalent to min. I/O
698 * size, and be multiple of min. I/O size.
700 if (ubi
->max_write_size
< ubi
->min_io_size
||
701 ubi
->max_write_size
% ubi
->min_io_size
||
702 !is_power_of_2(ubi
->max_write_size
)) {
703 ubi_err("bad write buffer size %d for %d min. I/O unit",
704 ubi
->max_write_size
, ubi
->min_io_size
);
708 /* Calculate default aligned sizes of EC and VID headers */
709 ubi
->ec_hdr_alsize
= ALIGN(UBI_EC_HDR_SIZE
, ubi
->hdrs_min_io_size
);
710 ubi
->vid_hdr_alsize
= ALIGN(UBI_VID_HDR_SIZE
, ubi
->hdrs_min_io_size
);
712 dbg_gen("min_io_size %d", ubi
->min_io_size
);
713 dbg_gen("max_write_size %d", ubi
->max_write_size
);
714 dbg_gen("hdrs_min_io_size %d", ubi
->hdrs_min_io_size
);
715 dbg_gen("ec_hdr_alsize %d", ubi
->ec_hdr_alsize
);
716 dbg_gen("vid_hdr_alsize %d", ubi
->vid_hdr_alsize
);
718 if (ubi
->vid_hdr_offset
== 0)
720 ubi
->vid_hdr_offset
= ubi
->vid_hdr_aloffset
=
723 ubi
->vid_hdr_aloffset
= ubi
->vid_hdr_offset
&
724 ~(ubi
->hdrs_min_io_size
- 1);
725 ubi
->vid_hdr_shift
= ubi
->vid_hdr_offset
-
726 ubi
->vid_hdr_aloffset
;
729 /* Similar for the data offset */
730 ubi
->leb_start
= ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
;
731 ubi
->leb_start
= ALIGN(ubi
->leb_start
, ubi
->min_io_size
);
733 dbg_gen("vid_hdr_offset %d", ubi
->vid_hdr_offset
);
734 dbg_gen("vid_hdr_aloffset %d", ubi
->vid_hdr_aloffset
);
735 dbg_gen("vid_hdr_shift %d", ubi
->vid_hdr_shift
);
736 dbg_gen("leb_start %d", ubi
->leb_start
);
738 /* The shift must be aligned to 32-bit boundary */
739 if (ubi
->vid_hdr_shift
% 4) {
740 ubi_err("unaligned VID header shift %d",
746 if (ubi
->vid_hdr_offset
< UBI_EC_HDR_SIZE
||
747 ubi
->leb_start
< ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
||
748 ubi
->leb_start
> ubi
->peb_size
- UBI_VID_HDR_SIZE
||
749 ubi
->leb_start
& (ubi
->min_io_size
- 1)) {
750 ubi_err("bad VID header (%d) or data offsets (%d)",
751 ubi
->vid_hdr_offset
, ubi
->leb_start
);
756 * Set maximum amount of physical erroneous eraseblocks to be 10%.
757 * Erroneous PEB are those which have read errors.
759 ubi
->max_erroneous
= ubi
->peb_count
/ 10;
760 if (ubi
->max_erroneous
< 16)
761 ubi
->max_erroneous
= 16;
762 dbg_gen("max_erroneous %d", ubi
->max_erroneous
);
765 * It may happen that EC and VID headers are situated in one minimal
766 * I/O unit. In this case we can only accept this UBI image in
769 if (ubi
->vid_hdr_offset
+ UBI_VID_HDR_SIZE
<= ubi
->hdrs_min_io_size
) {
770 ubi_warn("EC and VID headers are in the same minimal I/O unit, switch to read-only mode");
774 ubi
->leb_size
= ubi
->peb_size
- ubi
->leb_start
;
776 if (!(ubi
->mtd
->flags
& MTD_WRITEABLE
)) {
777 ubi_msg("MTD device %d is write-protected, attach in read-only mode",
783 * Note, ideally, we have to initialize @ubi->bad_peb_count here. But
784 * unfortunately, MTD does not provide this information. We should loop
785 * over all physical eraseblocks and invoke mtd->block_is_bad() for
786 * each physical eraseblock. So, we leave @ubi->bad_peb_count
787 * uninitialized so far.
794 * autoresize - re-size the volume which has the "auto-resize" flag set.
795 * @ubi: UBI device description object
796 * @vol_id: ID of the volume to re-size
798 * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in
799 * the volume table to the largest possible size. See comments in ubi-header.h
800 * for more description of the flag. Returns zero in case of success and a
801 * negative error code in case of failure.
803 static int autoresize(struct ubi_device
*ubi
, int vol_id
)
805 struct ubi_volume_desc desc
;
806 struct ubi_volume
*vol
= ubi
->volumes
[vol_id
];
807 int err
, old_reserved_pebs
= vol
->reserved_pebs
;
810 ubi_warn("skip auto-resize because of R/O mode");
815 * Clear the auto-resize flag in the volume in-memory copy of the
816 * volume table, and 'ubi_resize_volume()' will propagate this change
819 ubi
->vtbl
[vol_id
].flags
&= ~UBI_VTBL_AUTORESIZE_FLG
;
821 if (ubi
->avail_pebs
== 0) {
822 struct ubi_vtbl_record vtbl_rec
;
825 * No available PEBs to re-size the volume, clear the flag on
828 memcpy(&vtbl_rec
, &ubi
->vtbl
[vol_id
],
829 sizeof(struct ubi_vtbl_record
));
830 err
= ubi_change_vtbl_record(ubi
, vol_id
, &vtbl_rec
);
832 ubi_err("cannot clean auto-resize flag for volume %d",
836 err
= ubi_resize_volume(&desc
,
837 old_reserved_pebs
+ ubi
->avail_pebs
);
839 ubi_err("cannot auto-resize volume %d", vol_id
);
845 ubi_msg("volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id
,
846 vol
->name
, old_reserved_pebs
, vol
->reserved_pebs
);
851 * ubi_attach_mtd_dev - attach an MTD device.
852 * @mtd: MTD device description object
853 * @ubi_num: number to assign to the new UBI device
854 * @vid_hdr_offset: VID header offset
855 * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
857 * This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number
858 * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in
859 * which case this function finds a vacant device number and assigns it
860 * automatically. Returns the new UBI device number in case of success and a
861 * negative error code in case of failure.
863 * Note, the invocations of this function has to be serialized by the
864 * @ubi_devices_mutex.
866 int ubi_attach_mtd_dev(struct mtd_info
*mtd
, int ubi_num
,
867 int vid_hdr_offset
, int max_beb_per1024
)
869 struct ubi_device
*ubi
;
872 if (max_beb_per1024
< 0 || max_beb_per1024
> MAX_MTD_UBI_BEB_LIMIT
)
875 if (!max_beb_per1024
)
876 max_beb_per1024
= CONFIG_MTD_UBI_BEB_LIMIT
;
879 * Check if we already have the same MTD device attached.
881 * Note, this function assumes that UBI devices creations and deletions
882 * are serialized, so it does not take the &ubi_devices_lock.
884 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++) {
885 ubi
= ubi_devices
[i
];
886 if (ubi
&& mtd
->index
== ubi
->mtd
->index
) {
887 ubi_err("mtd%d is already attached to ubi%d",
894 * Make sure this MTD device is not emulated on top of an UBI volume
895 * already. Well, generally this recursion works fine, but there are
896 * different problems like the UBI module takes a reference to itself
897 * by attaching (and thus, opening) the emulated MTD device. This
898 * results in inability to unload the module. And in general it makes
899 * no sense to attach emulated MTD devices, so we prohibit this.
901 if (mtd
->type
== MTD_UBIVOLUME
) {
902 ubi_err("refuse attaching mtd%d - it is already emulated on top of UBI",
907 if (ubi_num
== UBI_DEV_NUM_AUTO
) {
908 /* Search for an empty slot in the @ubi_devices array */
909 for (ubi_num
= 0; ubi_num
< UBI_MAX_DEVICES
; ubi_num
++)
910 if (!ubi_devices
[ubi_num
])
912 if (ubi_num
== UBI_MAX_DEVICES
) {
913 ubi_err("only %d UBI devices may be created",
918 if (ubi_num
>= UBI_MAX_DEVICES
)
921 /* Make sure ubi_num is not busy */
922 if (ubi_devices
[ubi_num
]) {
923 ubi_err("ubi%d already exists", ubi_num
);
928 ubi
= kzalloc(sizeof(struct ubi_device
), GFP_KERNEL
);
933 ubi
->ubi_num
= ubi_num
;
934 ubi
->vid_hdr_offset
= vid_hdr_offset
;
935 ubi
->autoresize_vol_id
= -1;
937 #ifdef CONFIG_MTD_UBI_FASTMAP
938 ubi
->fm_pool
.used
= ubi
->fm_pool
.size
= 0;
939 ubi
->fm_wl_pool
.used
= ubi
->fm_wl_pool
.size
= 0;
942 * fm_pool.max_size is 5% of the total number of PEBs but it's also
943 * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE.
945 ubi
->fm_pool
.max_size
= min(((int)mtd_div_by_eb(ubi
->mtd
->size
,
946 ubi
->mtd
) / 100) * 5, UBI_FM_MAX_POOL_SIZE
);
947 if (ubi
->fm_pool
.max_size
< UBI_FM_MIN_POOL_SIZE
)
948 ubi
->fm_pool
.max_size
= UBI_FM_MIN_POOL_SIZE
;
950 ubi
->fm_wl_pool
.max_size
= UBI_FM_WL_POOL_SIZE
;
951 ubi
->fm_disabled
= !fm_autoconvert
;
953 if (!ubi
->fm_disabled
&& (int)mtd_div_by_eb(ubi
->mtd
->size
, ubi
->mtd
)
954 <= UBI_FM_MAX_START
) {
955 ubi_err("More than %i PEBs are needed for fastmap, sorry.",
957 ubi
->fm_disabled
= 1;
960 ubi_msg("default fastmap pool size: %d", ubi
->fm_pool
.max_size
);
961 ubi_msg("default fastmap WL pool size: %d", ubi
->fm_wl_pool
.max_size
);
963 ubi
->fm_disabled
= 1;
965 mutex_init(&ubi
->buf_mutex
);
966 mutex_init(&ubi
->ckvol_mutex
);
967 mutex_init(&ubi
->device_mutex
);
968 spin_lock_init(&ubi
->volumes_lock
);
969 mutex_init(&ubi
->fm_mutex
);
970 init_rwsem(&ubi
->fm_sem
);
972 ubi_msg("attaching mtd%d to ubi%d", mtd
->index
, ubi_num
);
974 err
= io_init(ubi
, max_beb_per1024
);
979 ubi
->peb_buf
= vmalloc(ubi
->peb_size
);
983 #ifdef CONFIG_MTD_UBI_FASTMAP
984 ubi
->fm_size
= ubi_calc_fm_size(ubi
);
985 ubi
->fm_buf
= vzalloc(ubi
->fm_size
);
989 err
= ubi_debugging_init_dev(ubi
);
993 err
= ubi_attach(ubi
, 0);
995 ubi_err("failed to attach mtd%d, error %d", mtd
->index
, err
);
999 if (ubi
->autoresize_vol_id
!= -1) {
1000 err
= autoresize(ubi
, ubi
->autoresize_vol_id
);
1005 err
= uif_init(ubi
, &ref
);
1009 err
= ubi_debugfs_init_dev(ubi
);
1013 ubi
->bgt_thread
= kthread_create(ubi_thread
, ubi
, ubi
->bgt_name
);
1014 if (IS_ERR(ubi
->bgt_thread
)) {
1015 err
= PTR_ERR(ubi
->bgt_thread
);
1016 ubi_err("cannot spawn \"%s\", error %d", ubi
->bgt_name
,
1021 ubi_msg("attached mtd%d (name \"%s\", size %llu MiB) to ubi%d",
1022 mtd
->index
, mtd
->name
, ubi
->flash_size
>> 20, ubi_num
);
1023 ubi_msg("PEB size: %d bytes (%d KiB), LEB size: %d bytes",
1024 ubi
->peb_size
, ubi
->peb_size
>> 10, ubi
->leb_size
);
1025 ubi_msg("min./max. I/O unit sizes: %d/%d, sub-page size %d",
1026 ubi
->min_io_size
, ubi
->max_write_size
, ubi
->hdrs_min_io_size
);
1027 ubi_msg("VID header offset: %d (aligned %d), data offset: %d",
1028 ubi
->vid_hdr_offset
, ubi
->vid_hdr_aloffset
, ubi
->leb_start
);
1029 ubi_msg("good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d",
1030 ubi
->good_peb_count
, ubi
->bad_peb_count
, ubi
->corr_peb_count
);
1031 ubi_msg("user volume: %d, internal volumes: %d, max. volumes count: %d",
1032 ubi
->vol_count
- UBI_INT_VOL_COUNT
, UBI_INT_VOL_COUNT
,
1034 ubi_msg("max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u",
1035 ubi
->max_ec
, ubi
->mean_ec
, CONFIG_MTD_UBI_WL_THRESHOLD
,
1037 ubi_msg("available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d",
1038 ubi
->avail_pebs
, ubi
->rsvd_pebs
, ubi
->beb_rsvd_pebs
);
1041 * The below lock makes sure we do not race with 'ubi_thread()' which
1042 * checks @ubi->thread_enabled. Otherwise we may fail to wake it up.
1044 spin_lock(&ubi
->wl_lock
);
1045 ubi
->thread_enabled
= 1;
1046 wake_up_process(ubi
->bgt_thread
);
1047 spin_unlock(&ubi
->wl_lock
);
1049 ubi_devices
[ubi_num
] = ubi
;
1050 ubi_notify_all(ubi
, UBI_VOLUME_ADDED
, NULL
);
1054 ubi_debugfs_exit_dev(ubi
);
1056 get_device(&ubi
->dev
);
1061 ubi_free_internal_volumes(ubi
);
1064 ubi_debugging_exit_dev(ubi
);
1066 vfree(ubi
->peb_buf
);
1069 put_device(&ubi
->dev
);
1076 * ubi_detach_mtd_dev - detach an MTD device.
1077 * @ubi_num: UBI device number to detach from
1078 * @anyway: detach MTD even if device reference count is not zero
1080 * This function destroys an UBI device number @ubi_num and detaches the
1081 * underlying MTD device. Returns zero in case of success and %-EBUSY if the
1082 * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not
1085 * Note, the invocations of this function has to be serialized by the
1086 * @ubi_devices_mutex.
1088 int ubi_detach_mtd_dev(int ubi_num
, int anyway
)
1090 struct ubi_device
*ubi
;
1092 if (ubi_num
< 0 || ubi_num
>= UBI_MAX_DEVICES
)
1095 ubi
= ubi_get_device(ubi_num
);
1099 spin_lock(&ubi_devices_lock
);
1100 put_device(&ubi
->dev
);
1101 ubi
->ref_count
-= 1;
1102 if (ubi
->ref_count
) {
1104 spin_unlock(&ubi_devices_lock
);
1107 /* This may only happen if there is a bug */
1108 ubi_err("%s reference count %d, destroy anyway",
1109 ubi
->ubi_name
, ubi
->ref_count
);
1111 ubi_devices
[ubi_num
] = NULL
;
1112 spin_unlock(&ubi_devices_lock
);
1114 ubi_assert(ubi_num
== ubi
->ubi_num
);
1115 ubi_notify_all(ubi
, UBI_VOLUME_REMOVED
, NULL
);
1116 ubi_msg("detaching mtd%d from ubi%d", ubi
->mtd
->index
, ubi_num
);
1117 #ifdef CONFIG_MTD_UBI_FASTMAP
1118 /* If we don't write a new fastmap at detach time we lose all
1119 * EC updates that have been made since the last written fastmap. */
1120 ubi_update_fastmap(ubi
);
1123 * Before freeing anything, we have to stop the background thread to
1124 * prevent it from doing anything on this device while we are freeing.
1126 if (ubi
->bgt_thread
)
1127 kthread_stop(ubi
->bgt_thread
);
1130 * Get a reference to the device in order to prevent 'dev_release()'
1131 * from freeing the @ubi object.
1133 get_device(&ubi
->dev
);
1135 ubi_debugfs_exit_dev(ubi
);
1139 ubi_free_internal_volumes(ubi
);
1141 put_mtd_device(ubi
->mtd
);
1142 ubi_debugging_exit_dev(ubi
);
1143 vfree(ubi
->peb_buf
);
1145 ubi_msg("mtd%d is detached from ubi%d", ubi
->mtd
->index
, ubi
->ubi_num
);
1146 put_device(&ubi
->dev
);
1151 * open_mtd_by_chdev - open an MTD device by its character device node path.
1152 * @mtd_dev: MTD character device node path
1154 * This helper function opens an MTD device by its character node device path.
1155 * Returns MTD device description object in case of success and a negative
1156 * error code in case of failure.
1158 static struct mtd_info
* __init
open_mtd_by_chdev(const char *mtd_dev
)
1160 int err
, major
, minor
, mode
;
1163 /* Probably this is an MTD character device node path */
1164 err
= kern_path(mtd_dev
, LOOKUP_FOLLOW
, &path
);
1166 return ERR_PTR(err
);
1168 /* MTD device number is defined by the major / minor numbers */
1169 major
= imajor(path
.dentry
->d_inode
);
1170 minor
= iminor(path
.dentry
->d_inode
);
1171 mode
= path
.dentry
->d_inode
->i_mode
;
1173 if (major
!= MTD_CHAR_MAJOR
|| !S_ISCHR(mode
))
1174 return ERR_PTR(-EINVAL
);
1178 * Just do not think the "/dev/mtdrX" devices support is need,
1179 * so do not support them to avoid doing extra work.
1181 return ERR_PTR(-EINVAL
);
1183 return get_mtd_device(NULL
, minor
/ 2);
1187 * open_mtd_device - open MTD device by name, character device path, or number.
1188 * @mtd_dev: name, character device node path, or MTD device device number
1190 * This function tries to open and MTD device described by @mtd_dev string,
1191 * which is first treated as ASCII MTD device number, and if it is not true, it
1192 * is treated as MTD device name, and if that is also not true, it is treated
1193 * as MTD character device node path. Returns MTD device description object in
1194 * case of success and a negative error code in case of failure.
1196 static struct mtd_info
* __init
open_mtd_device(const char *mtd_dev
)
1198 struct mtd_info
*mtd
;
1202 mtd_num
= simple_strtoul(mtd_dev
, &endp
, 0);
1203 if (*endp
!= '\0' || mtd_dev
== endp
) {
1205 * This does not look like an ASCII integer, probably this is
1208 mtd
= get_mtd_device_nm(mtd_dev
);
1209 if (IS_ERR(mtd
) && PTR_ERR(mtd
) == -ENODEV
)
1210 /* Probably this is an MTD character device node path */
1211 mtd
= open_mtd_by_chdev(mtd_dev
);
1213 mtd
= get_mtd_device(NULL
, mtd_num
);
1218 static int __init
ubi_init(void)
1222 /* Ensure that EC and VID headers have correct size */
1223 BUILD_BUG_ON(sizeof(struct ubi_ec_hdr
) != 64);
1224 BUILD_BUG_ON(sizeof(struct ubi_vid_hdr
) != 64);
1226 if (mtd_devs
> UBI_MAX_DEVICES
) {
1227 ubi_err("too many MTD devices, maximum is %d", UBI_MAX_DEVICES
);
1231 /* Create base sysfs directory and sysfs files */
1232 ubi_class
= class_create(THIS_MODULE
, UBI_NAME_STR
);
1233 if (IS_ERR(ubi_class
)) {
1234 err
= PTR_ERR(ubi_class
);
1235 ubi_err("cannot create UBI class");
1239 err
= class_create_file(ubi_class
, &ubi_version
);
1241 ubi_err("cannot create sysfs file");
1245 err
= misc_register(&ubi_ctrl_cdev
);
1247 ubi_err("cannot register device");
1251 ubi_wl_entry_slab
= kmem_cache_create("ubi_wl_entry_slab",
1252 sizeof(struct ubi_wl_entry
),
1254 if (!ubi_wl_entry_slab
)
1257 err
= ubi_debugfs_init();
1262 /* Attach MTD devices */
1263 for (i
= 0; i
< mtd_devs
; i
++) {
1264 struct mtd_dev_param
*p
= &mtd_dev_param
[i
];
1265 struct mtd_info
*mtd
;
1269 mtd
= open_mtd_device(p
->name
);
1275 mutex_lock(&ubi_devices_mutex
);
1276 err
= ubi_attach_mtd_dev(mtd
, UBI_DEV_NUM_AUTO
,
1277 p
->vid_hdr_offs
, p
->max_beb_per1024
);
1278 mutex_unlock(&ubi_devices_mutex
);
1280 ubi_err("cannot attach mtd%d", mtd
->index
);
1281 put_mtd_device(mtd
);
1284 * Originally UBI stopped initializing on any error.
1285 * However, later on it was found out that this
1286 * behavior is not very good when UBI is compiled into
1287 * the kernel and the MTD devices to attach are passed
1288 * through the command line. Indeed, UBI failure
1289 * stopped whole boot sequence.
1291 * To fix this, we changed the behavior for the
1292 * non-module case, but preserved the old behavior for
1293 * the module case, just for compatibility. This is a
1294 * little inconsistent, though.
1296 if (ubi_is_module())
1304 for (k
= 0; k
< i
; k
++)
1305 if (ubi_devices
[k
]) {
1306 mutex_lock(&ubi_devices_mutex
);
1307 ubi_detach_mtd_dev(ubi_devices
[k
]->ubi_num
, 1);
1308 mutex_unlock(&ubi_devices_mutex
);
1312 kmem_cache_destroy(ubi_wl_entry_slab
);
1314 misc_deregister(&ubi_ctrl_cdev
);
1316 class_remove_file(ubi_class
, &ubi_version
);
1318 class_destroy(ubi_class
);
1320 ubi_err("UBI error: cannot initialize UBI, error %d", err
);
1323 late_initcall(ubi_init
);
1325 static void __exit
ubi_exit(void)
1329 for (i
= 0; i
< UBI_MAX_DEVICES
; i
++)
1330 if (ubi_devices
[i
]) {
1331 mutex_lock(&ubi_devices_mutex
);
1332 ubi_detach_mtd_dev(ubi_devices
[i
]->ubi_num
, 1);
1333 mutex_unlock(&ubi_devices_mutex
);
1336 kmem_cache_destroy(ubi_wl_entry_slab
);
1337 misc_deregister(&ubi_ctrl_cdev
);
1338 class_remove_file(ubi_class
, &ubi_version
);
1339 class_destroy(ubi_class
);
1341 module_exit(ubi_exit
);
1344 * bytes_str_to_int - convert a number of bytes string into an integer.
1345 * @str: the string to convert
1347 * This function returns positive resulting integer in case of success and a
1348 * negative error code in case of failure.
1350 static int __init
bytes_str_to_int(const char *str
)
1353 unsigned long result
;
1355 result
= simple_strtoul(str
, &endp
, 0);
1356 if (str
== endp
|| result
>= INT_MAX
) {
1357 ubi_err("UBI error: incorrect bytes count: \"%s\"\n", str
);
1368 if (endp
[1] == 'i' && endp
[2] == 'B')
1373 ubi_err("UBI error: incorrect bytes count: \"%s\"\n", str
);
1381 * ubi_mtd_param_parse - parse the 'mtd=' UBI parameter.
1382 * @val: the parameter value to parse
1385 * This function returns zero in case of success and a negative error code in
1388 static int __init
ubi_mtd_param_parse(const char *val
, struct kernel_param
*kp
)
1391 struct mtd_dev_param
*p
;
1392 char buf
[MTD_PARAM_LEN_MAX
];
1393 char *pbuf
= &buf
[0];
1394 char *tokens
[MTD_PARAM_MAX_COUNT
];
1399 if (mtd_devs
== UBI_MAX_DEVICES
) {
1400 ubi_err("UBI error: too many parameters, max. is %d\n",
1405 len
= strnlen(val
, MTD_PARAM_LEN_MAX
);
1406 if (len
== MTD_PARAM_LEN_MAX
) {
1407 ubi_err("UBI error: parameter \"%s\" is too long, max. is %d\n",
1408 val
, MTD_PARAM_LEN_MAX
);
1413 pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n");
1419 /* Get rid of the final newline */
1420 if (buf
[len
- 1] == '\n')
1421 buf
[len
- 1] = '\0';
1423 for (i
= 0; i
< MTD_PARAM_MAX_COUNT
; i
++)
1424 tokens
[i
] = strsep(&pbuf
, ",");
1427 ubi_err("UBI error: too many arguments at \"%s\"\n", val
);
1431 p
= &mtd_dev_param
[mtd_devs
];
1432 strcpy(&p
->name
[0], tokens
[0]);
1435 p
->vid_hdr_offs
= bytes_str_to_int(tokens
[1]);
1437 if (p
->vid_hdr_offs
< 0)
1438 return p
->vid_hdr_offs
;
1441 int err
= kstrtoint(tokens
[2], 10, &p
->max_beb_per1024
);
1444 ubi_err("UBI error: bad value for max_beb_per1024 parameter: %s",
1454 module_param_call(mtd
, ubi_mtd_param_parse
, NULL
, NULL
, 000);
1455 MODULE_PARM_DESC(mtd
, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024]].\n"
1456 "Multiple \"mtd\" parameters may be specified.\n"
1457 "MTD devices may be specified by their number, name, or path to the MTD character device node.\n"
1458 "Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n"
1459 "Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value ("
1460 __stringify(CONFIG_MTD_UBI_BEB_LIMIT
) ") if 0)\n"
1462 "Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n"
1463 "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"
1464 "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"
1465 "\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
1466 #ifdef CONFIG_MTD_UBI_FASTMAP
1467 module_param(fm_autoconvert
, bool, 0644);
1468 MODULE_PARM_DESC(fm_autoconvert
, "Set this parameter to enable fastmap automatically on images without a fastmap.");
1470 MODULE_VERSION(__stringify(UBI_VERSION
));
1471 MODULE_DESCRIPTION("UBI - Unsorted Block Images");
1472 MODULE_AUTHOR("Artem Bityutskiy");
1473 MODULE_LICENSE("GPL");