Commit | Line | Data |
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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * Copyright (c) Nokia Corporation, 2006, 2007 | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
20 | */ | |
21 | ||
22 | /* | |
85c6e6e2 | 23 | * UBI input/output sub-system. |
801c135c | 24 | * |
85c6e6e2 AB |
25 | * This sub-system provides a uniform way to work with all kinds of the |
26 | * underlying MTD devices. It also implements handy functions for reading and | |
27 | * writing UBI headers. | |
801c135c AB |
28 | * |
29 | * We are trying to have a paranoid mindset and not to trust to what we read | |
85c6e6e2 AB |
30 | * from the flash media in order to be more secure and robust. So this |
31 | * sub-system validates every single header it reads from the flash media. | |
801c135c AB |
32 | * |
33 | * Some words about how the eraseblock headers are stored. | |
34 | * | |
35 | * The erase counter header is always stored at offset zero. By default, the | |
36 | * VID header is stored after the EC header at the closest aligned offset | |
37 | * (i.e. aligned to the minimum I/O unit size). Data starts next to the VID | |
38 | * header at the closest aligned offset. But this default layout may be | |
39 | * changed. For example, for different reasons (e.g., optimization) UBI may be | |
40 | * asked to put the VID header at further offset, and even at an unaligned | |
41 | * offset. Of course, if the offset of the VID header is unaligned, UBI adds | |
42 | * proper padding in front of it. Data offset may also be changed but it has to | |
43 | * be aligned. | |
44 | * | |
45 | * About minimal I/O units. In general, UBI assumes flash device model where | |
46 | * there is only one minimal I/O unit size. E.g., in case of NOR flash it is 1, | |
47 | * in case of NAND flash it is a NAND page, etc. This is reported by MTD in the | |
48 | * @ubi->mtd->writesize field. But as an exception, UBI admits of using another | |
49 | * (smaller) minimal I/O unit size for EC and VID headers to make it possible | |
50 | * to do different optimizations. | |
51 | * | |
52 | * This is extremely useful in case of NAND flashes which admit of several | |
53 | * write operations to one NAND page. In this case UBI can fit EC and VID | |
54 | * headers at one NAND page. Thus, UBI may use "sub-page" size as the minimal | |
55 | * I/O unit for the headers (the @ubi->hdrs_min_io_size field). But it still | |
56 | * reports NAND page size (@ubi->min_io_size) as a minimal I/O unit for the UBI | |
57 | * users. | |
58 | * | |
59 | * Example: some Samsung NANDs with 2KiB pages allow 4x 512-byte writes, so | |
60 | * although the minimal I/O unit is 2K, UBI uses 512 bytes for EC and VID | |
61 | * headers. | |
62 | * | |
63 | * Q: why not just to treat sub-page as a minimal I/O unit of this flash | |
64 | * device, e.g., make @ubi->min_io_size = 512 in the example above? | |
65 | * | |
66 | * A: because when writing a sub-page, MTD still writes a full 2K page but the | |
67 | * bytes which are no relevant to the sub-page are 0xFF. So, basically, writing | |
68 | * 4x512 sub-pages is 4 times slower then writing one 2KiB NAND page. Thus, we | |
69 | * prefer to use sub-pages only for EV and VID headers. | |
70 | * | |
71 | * As it was noted above, the VID header may start at a non-aligned offset. | |
72 | * For example, in case of a 2KiB page NAND flash with a 512 bytes sub-page, | |
73 | * the VID header may reside at offset 1984 which is the last 64 bytes of the | |
74 | * last sub-page (EC header is always at offset zero). This causes some | |
75 | * difficulties when reading and writing VID headers. | |
76 | * | |
77 | * Suppose we have a 64-byte buffer and we read a VID header at it. We change | |
78 | * the data and want to write this VID header out. As we can only write in | |
79 | * 512-byte chunks, we have to allocate one more buffer and copy our VID header | |
80 | * to offset 448 of this buffer. | |
81 | * | |
85c6e6e2 AB |
82 | * The I/O sub-system does the following trick in order to avoid this extra |
83 | * copy. It always allocates a @ubi->vid_hdr_alsize bytes buffer for the VID | |
84 | * header and returns a pointer to offset @ubi->vid_hdr_shift of this buffer. | |
85 | * When the VID header is being written out, it shifts the VID header pointer | |
86 | * back and writes the whole sub-page. | |
801c135c AB |
87 | */ |
88 | ||
89 | #include <linux/crc32.h> | |
90 | #include <linux/err.h> | |
91 | #include "ubi.h" | |
92 | ||
93 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
94 | static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum); | |
95 | static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum); | |
96 | static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum, | |
97 | const struct ubi_ec_hdr *ec_hdr); | |
98 | static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum); | |
99 | static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum, | |
100 | const struct ubi_vid_hdr *vid_hdr); | |
801c135c AB |
101 | #else |
102 | #define paranoid_check_not_bad(ubi, pnum) 0 | |
103 | #define paranoid_check_peb_ec_hdr(ubi, pnum) 0 | |
104 | #define paranoid_check_ec_hdr(ubi, pnum, ec_hdr) 0 | |
105 | #define paranoid_check_peb_vid_hdr(ubi, pnum) 0 | |
106 | #define paranoid_check_vid_hdr(ubi, pnum, vid_hdr) 0 | |
801c135c AB |
107 | #endif |
108 | ||
109 | /** | |
110 | * ubi_io_read - read data from a physical eraseblock. | |
111 | * @ubi: UBI device description object | |
112 | * @buf: buffer where to store the read data | |
113 | * @pnum: physical eraseblock number to read from | |
114 | * @offset: offset within the physical eraseblock from where to read | |
115 | * @len: how many bytes to read | |
116 | * | |
117 | * This function reads data from offset @offset of physical eraseblock @pnum | |
118 | * and stores the read data in the @buf buffer. The following return codes are | |
119 | * possible: | |
120 | * | |
121 | * o %0 if all the requested data were successfully read; | |
122 | * o %UBI_IO_BITFLIPS if all the requested data were successfully read, but | |
123 | * correctable bit-flips were detected; this is harmless but may indicate | |
124 | * that this eraseblock may become bad soon (but do not have to); | |
63b6c1ed AB |
125 | * o %-EBADMSG if the MTD subsystem reported about data integrity problems, for |
126 | * example it can be an ECC error in case of NAND; this most probably means | |
127 | * that the data is corrupted; | |
801c135c AB |
128 | * o %-EIO if some I/O error occurred; |
129 | * o other negative error codes in case of other errors. | |
130 | */ | |
131 | int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, | |
132 | int len) | |
133 | { | |
134 | int err, retries = 0; | |
135 | size_t read; | |
136 | loff_t addr; | |
137 | ||
138 | dbg_io("read %d bytes from PEB %d:%d", len, pnum, offset); | |
139 | ||
140 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
141 | ubi_assert(offset >= 0 && offset + len <= ubi->peb_size); | |
142 | ubi_assert(len > 0); | |
143 | ||
144 | err = paranoid_check_not_bad(ubi, pnum); | |
145 | if (err) | |
146 | return err > 0 ? -EINVAL : err; | |
147 | ||
148 | addr = (loff_t)pnum * ubi->peb_size + offset; | |
149 | retry: | |
150 | err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf); | |
151 | if (err) { | |
152 | if (err == -EUCLEAN) { | |
153 | /* | |
154 | * -EUCLEAN is reported if there was a bit-flip which | |
155 | * was corrected, so this is harmless. | |
8c1e6ee1 AB |
156 | * |
157 | * We do not report about it here unless debugging is | |
158 | * enabled. A corresponding message will be printed | |
159 | * later, when it is has been scrubbed. | |
801c135c | 160 | */ |
8c1e6ee1 | 161 | dbg_msg("fixable bit-flip detected at PEB %d", pnum); |
801c135c AB |
162 | ubi_assert(len == read); |
163 | return UBI_IO_BITFLIPS; | |
164 | } | |
165 | ||
166 | if (read != len && retries++ < UBI_IO_RETRIES) { | |
9c9ec147 AB |
167 | dbg_io("error %d while reading %d bytes from PEB %d:%d," |
168 | " read only %zd bytes, retry", | |
801c135c AB |
169 | err, len, pnum, offset, read); |
170 | yield(); | |
171 | goto retry; | |
172 | } | |
173 | ||
174 | ubi_err("error %d while reading %d bytes from PEB %d:%d, " | |
175 | "read %zd bytes", err, len, pnum, offset, read); | |
176 | ubi_dbg_dump_stack(); | |
2362a53e AB |
177 | |
178 | /* | |
179 | * The driver should never return -EBADMSG if it failed to read | |
180 | * all the requested data. But some buggy drivers might do | |
181 | * this, so we change it to -EIO. | |
182 | */ | |
183 | if (read != len && err == -EBADMSG) { | |
184 | ubi_assert(0); | |
185 | err = -EIO; | |
186 | } | |
801c135c AB |
187 | } else { |
188 | ubi_assert(len == read); | |
189 | ||
190 | if (ubi_dbg_is_bitflip()) { | |
c8566350 | 191 | dbg_gen("bit-flip (emulated)"); |
801c135c AB |
192 | err = UBI_IO_BITFLIPS; |
193 | } | |
194 | } | |
195 | ||
196 | return err; | |
197 | } | |
198 | ||
199 | /** | |
200 | * ubi_io_write - write data to a physical eraseblock. | |
201 | * @ubi: UBI device description object | |
202 | * @buf: buffer with the data to write | |
203 | * @pnum: physical eraseblock number to write to | |
204 | * @offset: offset within the physical eraseblock where to write | |
205 | * @len: how many bytes to write | |
206 | * | |
207 | * This function writes @len bytes of data from buffer @buf to offset @offset | |
208 | * of physical eraseblock @pnum. If all the data were successfully written, | |
209 | * zero is returned. If an error occurred, this function returns a negative | |
210 | * error code. If %-EIO is returned, the physical eraseblock most probably went | |
211 | * bad. | |
212 | * | |
213 | * Note, in case of an error, it is possible that something was still written | |
214 | * to the flash media, but may be some garbage. | |
215 | */ | |
e88d6e10 AB |
216 | int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset, |
217 | int len) | |
801c135c AB |
218 | { |
219 | int err; | |
220 | size_t written; | |
221 | loff_t addr; | |
222 | ||
223 | dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset); | |
224 | ||
225 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
226 | ubi_assert(offset >= 0 && offset + len <= ubi->peb_size); | |
227 | ubi_assert(offset % ubi->hdrs_min_io_size == 0); | |
228 | ubi_assert(len > 0 && len % ubi->hdrs_min_io_size == 0); | |
229 | ||
230 | if (ubi->ro_mode) { | |
231 | ubi_err("read-only mode"); | |
232 | return -EROFS; | |
233 | } | |
234 | ||
235 | /* The below has to be compiled out if paranoid checks are disabled */ | |
236 | ||
237 | err = paranoid_check_not_bad(ubi, pnum); | |
238 | if (err) | |
239 | return err > 0 ? -EINVAL : err; | |
240 | ||
241 | /* The area we are writing to has to contain all 0xFF bytes */ | |
40a71a87 | 242 | err = ubi_dbg_check_all_ff(ubi, pnum, offset, len); |
801c135c AB |
243 | if (err) |
244 | return err > 0 ? -EINVAL : err; | |
245 | ||
246 | if (offset >= ubi->leb_start) { | |
247 | /* | |
248 | * We write to the data area of the physical eraseblock. Make | |
249 | * sure it has valid EC and VID headers. | |
250 | */ | |
251 | err = paranoid_check_peb_ec_hdr(ubi, pnum); | |
252 | if (err) | |
253 | return err > 0 ? -EINVAL : err; | |
254 | err = paranoid_check_peb_vid_hdr(ubi, pnum); | |
255 | if (err) | |
256 | return err > 0 ? -EINVAL : err; | |
257 | } | |
258 | ||
259 | if (ubi_dbg_is_write_failure()) { | |
260 | dbg_err("cannot write %d bytes to PEB %d:%d " | |
261 | "(emulated)", len, pnum, offset); | |
262 | ubi_dbg_dump_stack(); | |
263 | return -EIO; | |
264 | } | |
265 | ||
266 | addr = (loff_t)pnum * ubi->peb_size + offset; | |
267 | err = ubi->mtd->write(ubi->mtd, addr, len, &written, buf); | |
268 | if (err) { | |
ebf53f42 AB |
269 | ubi_err("error %d while writing %d bytes to PEB %d:%d, written " |
270 | "%zd bytes", err, len, pnum, offset, written); | |
801c135c | 271 | ubi_dbg_dump_stack(); |
867996b1 | 272 | ubi_dbg_dump_flash(ubi, pnum, offset, len); |
801c135c AB |
273 | } else |
274 | ubi_assert(written == len); | |
275 | ||
276 | return err; | |
277 | } | |
278 | ||
279 | /** | |
280 | * erase_callback - MTD erasure call-back. | |
281 | * @ei: MTD erase information object. | |
282 | * | |
283 | * Note, even though MTD erase interface is asynchronous, all the current | |
284 | * implementations are synchronous anyway. | |
285 | */ | |
286 | static void erase_callback(struct erase_info *ei) | |
287 | { | |
288 | wake_up_interruptible((wait_queue_head_t *)ei->priv); | |
289 | } | |
290 | ||
291 | /** | |
292 | * do_sync_erase - synchronously erase a physical eraseblock. | |
293 | * @ubi: UBI device description object | |
294 | * @pnum: the physical eraseblock number to erase | |
295 | * | |
296 | * This function synchronously erases physical eraseblock @pnum and returns | |
297 | * zero in case of success and a negative error code in case of failure. If | |
298 | * %-EIO is returned, the physical eraseblock most probably went bad. | |
299 | */ | |
e88d6e10 | 300 | static int do_sync_erase(struct ubi_device *ubi, int pnum) |
801c135c AB |
301 | { |
302 | int err, retries = 0; | |
303 | struct erase_info ei; | |
304 | wait_queue_head_t wq; | |
305 | ||
306 | dbg_io("erase PEB %d", pnum); | |
307 | ||
308 | retry: | |
309 | init_waitqueue_head(&wq); | |
310 | memset(&ei, 0, sizeof(struct erase_info)); | |
311 | ||
312 | ei.mtd = ubi->mtd; | |
2f176f79 | 313 | ei.addr = (loff_t)pnum * ubi->peb_size; |
801c135c AB |
314 | ei.len = ubi->peb_size; |
315 | ei.callback = erase_callback; | |
316 | ei.priv = (unsigned long)&wq; | |
317 | ||
318 | err = ubi->mtd->erase(ubi->mtd, &ei); | |
319 | if (err) { | |
320 | if (retries++ < UBI_IO_RETRIES) { | |
321 | dbg_io("error %d while erasing PEB %d, retry", | |
322 | err, pnum); | |
323 | yield(); | |
324 | goto retry; | |
325 | } | |
326 | ubi_err("cannot erase PEB %d, error %d", pnum, err); | |
327 | ubi_dbg_dump_stack(); | |
328 | return err; | |
329 | } | |
330 | ||
331 | err = wait_event_interruptible(wq, ei.state == MTD_ERASE_DONE || | |
332 | ei.state == MTD_ERASE_FAILED); | |
333 | if (err) { | |
334 | ubi_err("interrupted PEB %d erasure", pnum); | |
335 | return -EINTR; | |
336 | } | |
337 | ||
338 | if (ei.state == MTD_ERASE_FAILED) { | |
339 | if (retries++ < UBI_IO_RETRIES) { | |
340 | dbg_io("error while erasing PEB %d, retry", pnum); | |
341 | yield(); | |
342 | goto retry; | |
343 | } | |
344 | ubi_err("cannot erase PEB %d", pnum); | |
345 | ubi_dbg_dump_stack(); | |
346 | return -EIO; | |
347 | } | |
348 | ||
40a71a87 | 349 | err = ubi_dbg_check_all_ff(ubi, pnum, 0, ubi->peb_size); |
801c135c AB |
350 | if (err) |
351 | return err > 0 ? -EINVAL : err; | |
352 | ||
353 | if (ubi_dbg_is_erase_failure() && !err) { | |
354 | dbg_err("cannot erase PEB %d (emulated)", pnum); | |
355 | return -EIO; | |
356 | } | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | /** | |
362 | * check_pattern - check if buffer contains only a certain byte pattern. | |
363 | * @buf: buffer to check | |
364 | * @patt: the pattern to check | |
365 | * @size: buffer size in bytes | |
366 | * | |
367 | * This function returns %1 in there are only @patt bytes in @buf, and %0 if | |
368 | * something else was also found. | |
369 | */ | |
370 | static int check_pattern(const void *buf, uint8_t patt, int size) | |
371 | { | |
372 | int i; | |
373 | ||
374 | for (i = 0; i < size; i++) | |
375 | if (((const uint8_t *)buf)[i] != patt) | |
376 | return 0; | |
377 | return 1; | |
378 | } | |
379 | ||
380 | /* Patterns to write to a physical eraseblock when torturing it */ | |
381 | static uint8_t patterns[] = {0xa5, 0x5a, 0x0}; | |
382 | ||
383 | /** | |
384 | * torture_peb - test a supposedly bad physical eraseblock. | |
385 | * @ubi: UBI device description object | |
386 | * @pnum: the physical eraseblock number to test | |
387 | * | |
388 | * This function returns %-EIO if the physical eraseblock did not pass the | |
389 | * test, a positive number of erase operations done if the test was | |
390 | * successfully passed, and other negative error codes in case of other errors. | |
391 | */ | |
e88d6e10 | 392 | static int torture_peb(struct ubi_device *ubi, int pnum) |
801c135c | 393 | { |
801c135c AB |
394 | int err, i, patt_count; |
395 | ||
8c1e6ee1 | 396 | ubi_msg("run torture test for PEB %d", pnum); |
801c135c AB |
397 | patt_count = ARRAY_SIZE(patterns); |
398 | ubi_assert(patt_count > 0); | |
399 | ||
e88d6e10 | 400 | mutex_lock(&ubi->buf_mutex); |
801c135c AB |
401 | for (i = 0; i < patt_count; i++) { |
402 | err = do_sync_erase(ubi, pnum); | |
403 | if (err) | |
404 | goto out; | |
405 | ||
406 | /* Make sure the PEB contains only 0xFF bytes */ | |
e88d6e10 | 407 | err = ubi_io_read(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size); |
801c135c AB |
408 | if (err) |
409 | goto out; | |
410 | ||
e88d6e10 | 411 | err = check_pattern(ubi->peb_buf1, 0xFF, ubi->peb_size); |
801c135c AB |
412 | if (err == 0) { |
413 | ubi_err("erased PEB %d, but a non-0xFF byte found", | |
414 | pnum); | |
415 | err = -EIO; | |
416 | goto out; | |
417 | } | |
418 | ||
419 | /* Write a pattern and check it */ | |
e88d6e10 AB |
420 | memset(ubi->peb_buf1, patterns[i], ubi->peb_size); |
421 | err = ubi_io_write(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size); | |
801c135c AB |
422 | if (err) |
423 | goto out; | |
424 | ||
e88d6e10 AB |
425 | memset(ubi->peb_buf1, ~patterns[i], ubi->peb_size); |
426 | err = ubi_io_read(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size); | |
801c135c AB |
427 | if (err) |
428 | goto out; | |
429 | ||
e88d6e10 | 430 | err = check_pattern(ubi->peb_buf1, patterns[i], ubi->peb_size); |
801c135c AB |
431 | if (err == 0) { |
432 | ubi_err("pattern %x checking failed for PEB %d", | |
433 | patterns[i], pnum); | |
434 | err = -EIO; | |
435 | goto out; | |
436 | } | |
437 | } | |
438 | ||
439 | err = patt_count; | |
8c1e6ee1 | 440 | ubi_msg("PEB %d passed torture test, do not mark it a bad", pnum); |
801c135c AB |
441 | |
442 | out: | |
e88d6e10 | 443 | mutex_unlock(&ubi->buf_mutex); |
8d2d4011 | 444 | if (err == UBI_IO_BITFLIPS || err == -EBADMSG) { |
801c135c AB |
445 | /* |
446 | * If a bit-flip or data integrity error was detected, the test | |
447 | * has not passed because it happened on a freshly erased | |
448 | * physical eraseblock which means something is wrong with it. | |
449 | */ | |
8d2d4011 AB |
450 | ubi_err("read problems on freshly erased PEB %d, must be bad", |
451 | pnum); | |
801c135c | 452 | err = -EIO; |
8d2d4011 | 453 | } |
801c135c AB |
454 | return err; |
455 | } | |
456 | ||
ebf53f42 AB |
457 | /** |
458 | * nor_erase_prepare - prepare a NOR flash PEB for erasure. | |
459 | * @ubi: UBI device description object | |
460 | * @pnum: physical eraseblock number to prepare | |
461 | * | |
462 | * NOR flash, or at least some of them, have peculiar embedded PEB erasure | |
463 | * algorithm: the PEB is first filled with zeroes, then it is erased. And | |
464 | * filling with zeroes starts from the end of the PEB. This was observed with | |
465 | * Spansion S29GL512N NOR flash. | |
466 | * | |
467 | * This means that in case of a power cut we may end up with intact data at the | |
468 | * beginning of the PEB, and all zeroes at the end of PEB. In other words, the | |
469 | * EC and VID headers are OK, but a large chunk of data at the end of PEB is | |
470 | * zeroed. This makes UBI mistakenly treat this PEB as used and associate it | |
471 | * with an LEB, which leads to subsequent failures (e.g., UBIFS fails). | |
472 | * | |
473 | * This function is called before erasing NOR PEBs and it zeroes out EC and VID | |
474 | * magic numbers in order to invalidate them and prevent the failures. Returns | |
475 | * zero in case of success and a negative error code in case of failure. | |
476 | */ | |
477 | static int nor_erase_prepare(struct ubi_device *ubi, int pnum) | |
478 | { | |
479 | int err; | |
480 | size_t written; | |
481 | loff_t addr; | |
482 | uint32_t data = 0; | |
483 | ||
5b289b56 | 484 | addr = (loff_t)pnum * ubi->peb_size + ubi->vid_hdr_aloffset; |
83c2099f | 485 | err = ubi->mtd->write(ubi->mtd, addr, 4, &written, (void *)&data); |
ebf53f42 | 486 | if (err) { |
83c2099f | 487 | ubi_err("error %d while writing 4 bytes to PEB %d:%d, written " |
5b289b56 | 488 | "%zd bytes", err, pnum, ubi->vid_hdr_aloffset, written); |
ebf53f42 AB |
489 | ubi_dbg_dump_stack(); |
490 | return err; | |
491 | } | |
492 | ||
5b289b56 | 493 | addr -= ubi->vid_hdr_aloffset; |
83c2099f | 494 | err = ubi->mtd->write(ubi->mtd, addr, 4, &written, (void *)&data); |
ebf53f42 AB |
495 | if (err) { |
496 | ubi_err("error %d while writing 4 bytes to PEB %d:%d, written " | |
5b289b56 | 497 | "%zd bytes", err, pnum, 0, written); |
ebf53f42 AB |
498 | ubi_dbg_dump_stack(); |
499 | return err; | |
500 | } | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
801c135c AB |
505 | /** |
506 | * ubi_io_sync_erase - synchronously erase a physical eraseblock. | |
507 | * @ubi: UBI device description object | |
508 | * @pnum: physical eraseblock number to erase | |
509 | * @torture: if this physical eraseblock has to be tortured | |
510 | * | |
511 | * This function synchronously erases physical eraseblock @pnum. If @torture | |
512 | * flag is not zero, the physical eraseblock is checked by means of writing | |
513 | * different patterns to it and reading them back. If the torturing is enabled, | |
025dfdaf | 514 | * the physical eraseblock is erased more than once. |
801c135c AB |
515 | * |
516 | * This function returns the number of erasures made in case of success, %-EIO | |
517 | * if the erasure failed or the torturing test failed, and other negative error | |
518 | * codes in case of other errors. Note, %-EIO means that the physical | |
519 | * eraseblock is bad. | |
520 | */ | |
e88d6e10 | 521 | int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture) |
801c135c AB |
522 | { |
523 | int err, ret = 0; | |
524 | ||
525 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
526 | ||
527 | err = paranoid_check_not_bad(ubi, pnum); | |
528 | if (err != 0) | |
529 | return err > 0 ? -EINVAL : err; | |
530 | ||
531 | if (ubi->ro_mode) { | |
532 | ubi_err("read-only mode"); | |
533 | return -EROFS; | |
534 | } | |
535 | ||
ebf53f42 AB |
536 | if (ubi->nor_flash) { |
537 | err = nor_erase_prepare(ubi, pnum); | |
538 | if (err) | |
539 | return err; | |
540 | } | |
541 | ||
801c135c AB |
542 | if (torture) { |
543 | ret = torture_peb(ubi, pnum); | |
544 | if (ret < 0) | |
545 | return ret; | |
546 | } | |
547 | ||
548 | err = do_sync_erase(ubi, pnum); | |
549 | if (err) | |
550 | return err; | |
551 | ||
552 | return ret + 1; | |
553 | } | |
554 | ||
555 | /** | |
556 | * ubi_io_is_bad - check if a physical eraseblock is bad. | |
557 | * @ubi: UBI device description object | |
558 | * @pnum: the physical eraseblock number to check | |
559 | * | |
560 | * This function returns a positive number if the physical eraseblock is bad, | |
561 | * zero if not, and a negative error code if an error occurred. | |
562 | */ | |
563 | int ubi_io_is_bad(const struct ubi_device *ubi, int pnum) | |
564 | { | |
565 | struct mtd_info *mtd = ubi->mtd; | |
566 | ||
567 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
568 | ||
569 | if (ubi->bad_allowed) { | |
570 | int ret; | |
571 | ||
572 | ret = mtd->block_isbad(mtd, (loff_t)pnum * ubi->peb_size); | |
573 | if (ret < 0) | |
574 | ubi_err("error %d while checking if PEB %d is bad", | |
575 | ret, pnum); | |
576 | else if (ret) | |
577 | dbg_io("PEB %d is bad", pnum); | |
578 | return ret; | |
579 | } | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | /** | |
585 | * ubi_io_mark_bad - mark a physical eraseblock as bad. | |
586 | * @ubi: UBI device description object | |
587 | * @pnum: the physical eraseblock number to mark | |
588 | * | |
589 | * This function returns zero in case of success and a negative error code in | |
590 | * case of failure. | |
591 | */ | |
592 | int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum) | |
593 | { | |
594 | int err; | |
595 | struct mtd_info *mtd = ubi->mtd; | |
596 | ||
597 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
598 | ||
599 | if (ubi->ro_mode) { | |
600 | ubi_err("read-only mode"); | |
601 | return -EROFS; | |
602 | } | |
603 | ||
604 | if (!ubi->bad_allowed) | |
605 | return 0; | |
606 | ||
607 | err = mtd->block_markbad(mtd, (loff_t)pnum * ubi->peb_size); | |
608 | if (err) | |
609 | ubi_err("cannot mark PEB %d bad, error %d", pnum, err); | |
610 | return err; | |
611 | } | |
612 | ||
613 | /** | |
614 | * validate_ec_hdr - validate an erase counter header. | |
615 | * @ubi: UBI device description object | |
616 | * @ec_hdr: the erase counter header to check | |
617 | * | |
618 | * This function returns zero if the erase counter header is OK, and %1 if | |
619 | * not. | |
620 | */ | |
fe96efc1 | 621 | static int validate_ec_hdr(const struct ubi_device *ubi, |
801c135c AB |
622 | const struct ubi_ec_hdr *ec_hdr) |
623 | { | |
624 | long long ec; | |
fe96efc1 | 625 | int vid_hdr_offset, leb_start; |
801c135c | 626 | |
3261ebd7 CH |
627 | ec = be64_to_cpu(ec_hdr->ec); |
628 | vid_hdr_offset = be32_to_cpu(ec_hdr->vid_hdr_offset); | |
629 | leb_start = be32_to_cpu(ec_hdr->data_offset); | |
801c135c AB |
630 | |
631 | if (ec_hdr->version != UBI_VERSION) { | |
632 | ubi_err("node with incompatible UBI version found: " | |
633 | "this UBI version is %d, image version is %d", | |
634 | UBI_VERSION, (int)ec_hdr->version); | |
635 | goto bad; | |
636 | } | |
637 | ||
638 | if (vid_hdr_offset != ubi->vid_hdr_offset) { | |
639 | ubi_err("bad VID header offset %d, expected %d", | |
640 | vid_hdr_offset, ubi->vid_hdr_offset); | |
641 | goto bad; | |
642 | } | |
643 | ||
644 | if (leb_start != ubi->leb_start) { | |
645 | ubi_err("bad data offset %d, expected %d", | |
646 | leb_start, ubi->leb_start); | |
647 | goto bad; | |
648 | } | |
649 | ||
650 | if (ec < 0 || ec > UBI_MAX_ERASECOUNTER) { | |
651 | ubi_err("bad erase counter %lld", ec); | |
652 | goto bad; | |
653 | } | |
654 | ||
655 | return 0; | |
656 | ||
657 | bad: | |
658 | ubi_err("bad EC header"); | |
659 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
660 | ubi_dbg_dump_stack(); | |
661 | return 1; | |
662 | } | |
663 | ||
664 | /** | |
665 | * ubi_io_read_ec_hdr - read and check an erase counter header. | |
666 | * @ubi: UBI device description object | |
667 | * @pnum: physical eraseblock to read from | |
668 | * @ec_hdr: a &struct ubi_ec_hdr object where to store the read erase counter | |
669 | * header | |
670 | * @verbose: be verbose if the header is corrupted or was not found | |
671 | * | |
672 | * This function reads erase counter header from physical eraseblock @pnum and | |
673 | * stores it in @ec_hdr. This function also checks CRC checksum of the read | |
674 | * erase counter header. The following codes may be returned: | |
675 | * | |
676 | * o %0 if the CRC checksum is correct and the header was successfully read; | |
677 | * o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected | |
678 | * and corrected by the flash driver; this is harmless but may indicate that | |
679 | * this eraseblock may become bad soon (but may be not); | |
680 | * o %UBI_IO_BAD_EC_HDR if the erase counter header is corrupted (a CRC error); | |
681 | * o %UBI_IO_PEB_EMPTY if the physical eraseblock is empty; | |
682 | * o a negative error code in case of failure. | |
683 | */ | |
e88d6e10 | 684 | int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
685 | struct ubi_ec_hdr *ec_hdr, int verbose) |
686 | { | |
687 | int err, read_err = 0; | |
688 | uint32_t crc, magic, hdr_crc; | |
689 | ||
690 | dbg_io("read EC header from PEB %d", pnum); | |
691 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
692 | ||
693 | err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE); | |
694 | if (err) { | |
695 | if (err != UBI_IO_BITFLIPS && err != -EBADMSG) | |
696 | return err; | |
697 | ||
698 | /* | |
699 | * We read all the data, but either a correctable bit-flip | |
700 | * occurred, or MTD reported about some data integrity error, | |
701 | * like an ECC error in case of NAND. The former is harmless, | |
702 | * the later may mean that the read data is corrupted. But we | |
703 | * have a CRC check-sum and we will detect this. If the EC | |
704 | * header is still OK, we just report this as there was a | |
705 | * bit-flip. | |
706 | */ | |
707 | read_err = err; | |
708 | } | |
709 | ||
3261ebd7 | 710 | magic = be32_to_cpu(ec_hdr->magic); |
801c135c AB |
711 | if (magic != UBI_EC_HDR_MAGIC) { |
712 | /* | |
713 | * The magic field is wrong. Let's check if we have read all | |
714 | * 0xFF. If yes, this physical eraseblock is assumed to be | |
715 | * empty. | |
716 | * | |
717 | * But if there was a read error, we do not test it for all | |
718 | * 0xFFs. Even if it does contain all 0xFFs, this error | |
719 | * indicates that something is still wrong with this physical | |
720 | * eraseblock and we anyway cannot treat it as empty. | |
721 | */ | |
722 | if (read_err != -EBADMSG && | |
723 | check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) { | |
724 | /* The physical eraseblock is supposedly empty */ | |
801c135c AB |
725 | if (verbose) |
726 | ubi_warn("no EC header found at PEB %d, " | |
727 | "only 0xFF bytes", pnum); | |
ed45819f AB |
728 | else if (UBI_IO_DEBUG) |
729 | dbg_msg("no EC header found at PEB %d, " | |
730 | "only 0xFF bytes", pnum); | |
801c135c AB |
731 | return UBI_IO_PEB_EMPTY; |
732 | } | |
733 | ||
734 | /* | |
735 | * This is not a valid erase counter header, and these are not | |
736 | * 0xFF bytes. Report that the header is corrupted. | |
737 | */ | |
738 | if (verbose) { | |
739 | ubi_warn("bad magic number at PEB %d: %08x instead of " | |
740 | "%08x", pnum, magic, UBI_EC_HDR_MAGIC); | |
741 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
ed45819f AB |
742 | } else if (UBI_IO_DEBUG) |
743 | dbg_msg("bad magic number at PEB %d: %08x instead of " | |
744 | "%08x", pnum, magic, UBI_EC_HDR_MAGIC); | |
801c135c AB |
745 | return UBI_IO_BAD_EC_HDR; |
746 | } | |
747 | ||
748 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 749 | hdr_crc = be32_to_cpu(ec_hdr->hdr_crc); |
801c135c AB |
750 | |
751 | if (hdr_crc != crc) { | |
752 | if (verbose) { | |
9c9ec147 AB |
753 | ubi_warn("bad EC header CRC at PEB %d, calculated " |
754 | "%#08x, read %#08x", pnum, crc, hdr_crc); | |
801c135c | 755 | ubi_dbg_dump_ec_hdr(ec_hdr); |
ed45819f AB |
756 | } else if (UBI_IO_DEBUG) |
757 | dbg_msg("bad EC header CRC at PEB %d, calculated " | |
758 | "%#08x, read %#08x", pnum, crc, hdr_crc); | |
801c135c AB |
759 | return UBI_IO_BAD_EC_HDR; |
760 | } | |
761 | ||
762 | /* And of course validate what has just been read from the media */ | |
763 | err = validate_ec_hdr(ubi, ec_hdr); | |
764 | if (err) { | |
765 | ubi_err("validation failed for PEB %d", pnum); | |
766 | return -EINVAL; | |
767 | } | |
768 | ||
769 | return read_err ? UBI_IO_BITFLIPS : 0; | |
770 | } | |
771 | ||
772 | /** | |
773 | * ubi_io_write_ec_hdr - write an erase counter header. | |
774 | * @ubi: UBI device description object | |
775 | * @pnum: physical eraseblock to write to | |
776 | * @ec_hdr: the erase counter header to write | |
777 | * | |
778 | * This function writes erase counter header described by @ec_hdr to physical | |
779 | * eraseblock @pnum. It also fills most fields of @ec_hdr before writing, so | |
780 | * the caller do not have to fill them. Callers must only fill the @ec_hdr->ec | |
781 | * field. | |
782 | * | |
783 | * This function returns zero in case of success and a negative error code in | |
784 | * case of failure. If %-EIO is returned, the physical eraseblock most probably | |
785 | * went bad. | |
786 | */ | |
e88d6e10 | 787 | int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
788 | struct ubi_ec_hdr *ec_hdr) |
789 | { | |
790 | int err; | |
791 | uint32_t crc; | |
792 | ||
793 | dbg_io("write EC header to PEB %d", pnum); | |
794 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
795 | ||
3261ebd7 | 796 | ec_hdr->magic = cpu_to_be32(UBI_EC_HDR_MAGIC); |
801c135c | 797 | ec_hdr->version = UBI_VERSION; |
3261ebd7 CH |
798 | ec_hdr->vid_hdr_offset = cpu_to_be32(ubi->vid_hdr_offset); |
799 | ec_hdr->data_offset = cpu_to_be32(ubi->leb_start); | |
0c6c7fa1 | 800 | ec_hdr->image_seq = cpu_to_be32(ubi->image_seq); |
801c135c | 801 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); |
3261ebd7 | 802 | ec_hdr->hdr_crc = cpu_to_be32(crc); |
801c135c AB |
803 | |
804 | err = paranoid_check_ec_hdr(ubi, pnum, ec_hdr); | |
805 | if (err) | |
806 | return -EINVAL; | |
807 | ||
808 | err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize); | |
809 | return err; | |
810 | } | |
811 | ||
812 | /** | |
813 | * validate_vid_hdr - validate a volume identifier header. | |
814 | * @ubi: UBI device description object | |
815 | * @vid_hdr: the volume identifier header to check | |
816 | * | |
817 | * This function checks that data stored in the volume identifier header | |
818 | * @vid_hdr. Returns zero if the VID header is OK and %1 if not. | |
819 | */ | |
820 | static int validate_vid_hdr(const struct ubi_device *ubi, | |
821 | const struct ubi_vid_hdr *vid_hdr) | |
822 | { | |
823 | int vol_type = vid_hdr->vol_type; | |
824 | int copy_flag = vid_hdr->copy_flag; | |
3261ebd7 CH |
825 | int vol_id = be32_to_cpu(vid_hdr->vol_id); |
826 | int lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c | 827 | int compat = vid_hdr->compat; |
3261ebd7 CH |
828 | int data_size = be32_to_cpu(vid_hdr->data_size); |
829 | int used_ebs = be32_to_cpu(vid_hdr->used_ebs); | |
830 | int data_pad = be32_to_cpu(vid_hdr->data_pad); | |
831 | int data_crc = be32_to_cpu(vid_hdr->data_crc); | |
801c135c AB |
832 | int usable_leb_size = ubi->leb_size - data_pad; |
833 | ||
834 | if (copy_flag != 0 && copy_flag != 1) { | |
835 | dbg_err("bad copy_flag"); | |
836 | goto bad; | |
837 | } | |
838 | ||
839 | if (vol_id < 0 || lnum < 0 || data_size < 0 || used_ebs < 0 || | |
840 | data_pad < 0) { | |
841 | dbg_err("negative values"); | |
842 | goto bad; | |
843 | } | |
844 | ||
845 | if (vol_id >= UBI_MAX_VOLUMES && vol_id < UBI_INTERNAL_VOL_START) { | |
846 | dbg_err("bad vol_id"); | |
847 | goto bad; | |
848 | } | |
849 | ||
850 | if (vol_id < UBI_INTERNAL_VOL_START && compat != 0) { | |
851 | dbg_err("bad compat"); | |
852 | goto bad; | |
853 | } | |
854 | ||
855 | if (vol_id >= UBI_INTERNAL_VOL_START && compat != UBI_COMPAT_DELETE && | |
856 | compat != UBI_COMPAT_RO && compat != UBI_COMPAT_PRESERVE && | |
857 | compat != UBI_COMPAT_REJECT) { | |
858 | dbg_err("bad compat"); | |
859 | goto bad; | |
860 | } | |
861 | ||
862 | if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) { | |
863 | dbg_err("bad vol_type"); | |
864 | goto bad; | |
865 | } | |
866 | ||
867 | if (data_pad >= ubi->leb_size / 2) { | |
868 | dbg_err("bad data_pad"); | |
869 | goto bad; | |
870 | } | |
871 | ||
872 | if (vol_type == UBI_VID_STATIC) { | |
873 | /* | |
874 | * Although from high-level point of view static volumes may | |
875 | * contain zero bytes of data, but no VID headers can contain | |
876 | * zero at these fields, because they empty volumes do not have | |
877 | * mapped logical eraseblocks. | |
878 | */ | |
879 | if (used_ebs == 0) { | |
880 | dbg_err("zero used_ebs"); | |
881 | goto bad; | |
882 | } | |
883 | if (data_size == 0) { | |
884 | dbg_err("zero data_size"); | |
885 | goto bad; | |
886 | } | |
887 | if (lnum < used_ebs - 1) { | |
888 | if (data_size != usable_leb_size) { | |
889 | dbg_err("bad data_size"); | |
890 | goto bad; | |
891 | } | |
892 | } else if (lnum == used_ebs - 1) { | |
893 | if (data_size == 0) { | |
894 | dbg_err("bad data_size at last LEB"); | |
895 | goto bad; | |
896 | } | |
897 | } else { | |
898 | dbg_err("too high lnum"); | |
899 | goto bad; | |
900 | } | |
901 | } else { | |
902 | if (copy_flag == 0) { | |
903 | if (data_crc != 0) { | |
904 | dbg_err("non-zero data CRC"); | |
905 | goto bad; | |
906 | } | |
907 | if (data_size != 0) { | |
908 | dbg_err("non-zero data_size"); | |
909 | goto bad; | |
910 | } | |
911 | } else { | |
912 | if (data_size == 0) { | |
913 | dbg_err("zero data_size of copy"); | |
914 | goto bad; | |
915 | } | |
916 | } | |
917 | if (used_ebs != 0) { | |
918 | dbg_err("bad used_ebs"); | |
919 | goto bad; | |
920 | } | |
921 | } | |
922 | ||
923 | return 0; | |
924 | ||
925 | bad: | |
926 | ubi_err("bad VID header"); | |
927 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
928 | ubi_dbg_dump_stack(); | |
929 | return 1; | |
930 | } | |
931 | ||
932 | /** | |
933 | * ubi_io_read_vid_hdr - read and check a volume identifier header. | |
934 | * @ubi: UBI device description object | |
935 | * @pnum: physical eraseblock number to read from | |
936 | * @vid_hdr: &struct ubi_vid_hdr object where to store the read volume | |
937 | * identifier header | |
938 | * @verbose: be verbose if the header is corrupted or wasn't found | |
939 | * | |
940 | * This function reads the volume identifier header from physical eraseblock | |
941 | * @pnum and stores it in @vid_hdr. It also checks CRC checksum of the read | |
942 | * volume identifier header. The following codes may be returned: | |
943 | * | |
944 | * o %0 if the CRC checksum is correct and the header was successfully read; | |
945 | * o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected | |
946 | * and corrected by the flash driver; this is harmless but may indicate that | |
947 | * this eraseblock may become bad soon; | |
815bc5f8 | 948 | * o %UBI_IO_BAD_VID_HDR if the volume identifier header is corrupted (a CRC |
801c135c AB |
949 | * error detected); |
950 | * o %UBI_IO_PEB_FREE if the physical eraseblock is free (i.e., there is no VID | |
951 | * header there); | |
952 | * o a negative error code in case of failure. | |
953 | */ | |
e88d6e10 | 954 | int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
955 | struct ubi_vid_hdr *vid_hdr, int verbose) |
956 | { | |
957 | int err, read_err = 0; | |
958 | uint32_t crc, magic, hdr_crc; | |
959 | void *p; | |
960 | ||
961 | dbg_io("read VID header from PEB %d", pnum); | |
962 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
963 | ||
964 | p = (char *)vid_hdr - ubi->vid_hdr_shift; | |
965 | err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset, | |
966 | ubi->vid_hdr_alsize); | |
967 | if (err) { | |
968 | if (err != UBI_IO_BITFLIPS && err != -EBADMSG) | |
969 | return err; | |
970 | ||
971 | /* | |
972 | * We read all the data, but either a correctable bit-flip | |
973 | * occurred, or MTD reported about some data integrity error, | |
974 | * like an ECC error in case of NAND. The former is harmless, | |
975 | * the later may mean the read data is corrupted. But we have a | |
976 | * CRC check-sum and we will identify this. If the VID header is | |
977 | * still OK, we just report this as there was a bit-flip. | |
978 | */ | |
979 | read_err = err; | |
980 | } | |
981 | ||
3261ebd7 | 982 | magic = be32_to_cpu(vid_hdr->magic); |
801c135c AB |
983 | if (magic != UBI_VID_HDR_MAGIC) { |
984 | /* | |
985 | * If we have read all 0xFF bytes, the VID header probably does | |
986 | * not exist and the physical eraseblock is assumed to be free. | |
987 | * | |
988 | * But if there was a read error, we do not test the data for | |
989 | * 0xFFs. Even if it does contain all 0xFFs, this error | |
990 | * indicates that something is still wrong with this physical | |
991 | * eraseblock and it cannot be regarded as free. | |
992 | */ | |
993 | if (read_err != -EBADMSG && | |
994 | check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) { | |
995 | /* The physical eraseblock is supposedly free */ | |
801c135c AB |
996 | if (verbose) |
997 | ubi_warn("no VID header found at PEB %d, " | |
998 | "only 0xFF bytes", pnum); | |
ed45819f AB |
999 | else if (UBI_IO_DEBUG) |
1000 | dbg_msg("no VID header found at PEB %d, " | |
1001 | "only 0xFF bytes", pnum); | |
801c135c AB |
1002 | return UBI_IO_PEB_FREE; |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * This is not a valid VID header, and these are not 0xFF | |
1007 | * bytes. Report that the header is corrupted. | |
1008 | */ | |
1009 | if (verbose) { | |
1010 | ubi_warn("bad magic number at PEB %d: %08x instead of " | |
1011 | "%08x", pnum, magic, UBI_VID_HDR_MAGIC); | |
1012 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
ed45819f AB |
1013 | } else if (UBI_IO_DEBUG) |
1014 | dbg_msg("bad magic number at PEB %d: %08x instead of " | |
1015 | "%08x", pnum, magic, UBI_VID_HDR_MAGIC); | |
801c135c AB |
1016 | return UBI_IO_BAD_VID_HDR; |
1017 | } | |
1018 | ||
1019 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); | |
3261ebd7 | 1020 | hdr_crc = be32_to_cpu(vid_hdr->hdr_crc); |
801c135c AB |
1021 | |
1022 | if (hdr_crc != crc) { | |
1023 | if (verbose) { | |
1024 | ubi_warn("bad CRC at PEB %d, calculated %#08x, " | |
1025 | "read %#08x", pnum, crc, hdr_crc); | |
1026 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
ed45819f AB |
1027 | } else if (UBI_IO_DEBUG) |
1028 | dbg_msg("bad CRC at PEB %d, calculated %#08x, " | |
1029 | "read %#08x", pnum, crc, hdr_crc); | |
801c135c AB |
1030 | return UBI_IO_BAD_VID_HDR; |
1031 | } | |
1032 | ||
1033 | /* Validate the VID header that we have just read */ | |
1034 | err = validate_vid_hdr(ubi, vid_hdr); | |
1035 | if (err) { | |
1036 | ubi_err("validation failed for PEB %d", pnum); | |
1037 | return -EINVAL; | |
1038 | } | |
1039 | ||
1040 | return read_err ? UBI_IO_BITFLIPS : 0; | |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * ubi_io_write_vid_hdr - write a volume identifier header. | |
1045 | * @ubi: UBI device description object | |
1046 | * @pnum: the physical eraseblock number to write to | |
1047 | * @vid_hdr: the volume identifier header to write | |
1048 | * | |
1049 | * This function writes the volume identifier header described by @vid_hdr to | |
1050 | * physical eraseblock @pnum. This function automatically fills the | |
1051 | * @vid_hdr->magic and the @vid_hdr->version fields, as well as calculates | |
1052 | * header CRC checksum and stores it at vid_hdr->hdr_crc. | |
1053 | * | |
1054 | * This function returns zero in case of success and a negative error code in | |
1055 | * case of failure. If %-EIO is returned, the physical eraseblock probably went | |
1056 | * bad. | |
1057 | */ | |
e88d6e10 | 1058 | int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
1059 | struct ubi_vid_hdr *vid_hdr) |
1060 | { | |
1061 | int err; | |
1062 | uint32_t crc; | |
1063 | void *p; | |
1064 | ||
1065 | dbg_io("write VID header to PEB %d", pnum); | |
1066 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
1067 | ||
1068 | err = paranoid_check_peb_ec_hdr(ubi, pnum); | |
1069 | if (err) | |
f2863c54 | 1070 | return err > 0 ? -EINVAL : err; |
801c135c | 1071 | |
3261ebd7 | 1072 | vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC); |
801c135c AB |
1073 | vid_hdr->version = UBI_VERSION; |
1074 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); | |
3261ebd7 | 1075 | vid_hdr->hdr_crc = cpu_to_be32(crc); |
801c135c AB |
1076 | |
1077 | err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr); | |
1078 | if (err) | |
1079 | return -EINVAL; | |
1080 | ||
1081 | p = (char *)vid_hdr - ubi->vid_hdr_shift; | |
1082 | err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset, | |
1083 | ubi->vid_hdr_alsize); | |
1084 | return err; | |
1085 | } | |
1086 | ||
1087 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
1088 | ||
1089 | /** | |
1090 | * paranoid_check_not_bad - ensure that a physical eraseblock is not bad. | |
1091 | * @ubi: UBI device description object | |
1092 | * @pnum: physical eraseblock number to check | |
1093 | * | |
1094 | * This function returns zero if the physical eraseblock is good, a positive | |
1095 | * number if it is bad and a negative error code if an error occurred. | |
1096 | */ | |
1097 | static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum) | |
1098 | { | |
1099 | int err; | |
1100 | ||
1101 | err = ubi_io_is_bad(ubi, pnum); | |
1102 | if (!err) | |
1103 | return err; | |
1104 | ||
1105 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1106 | ubi_dbg_dump_stack(); | |
1107 | return err; | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * paranoid_check_ec_hdr - check if an erase counter header is all right. | |
1112 | * @ubi: UBI device description object | |
1113 | * @pnum: physical eraseblock number the erase counter header belongs to | |
1114 | * @ec_hdr: the erase counter header to check | |
1115 | * | |
1116 | * This function returns zero if the erase counter header contains valid | |
1117 | * values, and %1 if not. | |
1118 | */ | |
1119 | static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum, | |
1120 | const struct ubi_ec_hdr *ec_hdr) | |
1121 | { | |
1122 | int err; | |
1123 | uint32_t magic; | |
1124 | ||
3261ebd7 | 1125 | magic = be32_to_cpu(ec_hdr->magic); |
801c135c AB |
1126 | if (magic != UBI_EC_HDR_MAGIC) { |
1127 | ubi_err("bad magic %#08x, must be %#08x", | |
1128 | magic, UBI_EC_HDR_MAGIC); | |
1129 | goto fail; | |
1130 | } | |
1131 | ||
1132 | err = validate_ec_hdr(ubi, ec_hdr); | |
1133 | if (err) { | |
1134 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1135 | goto fail; | |
1136 | } | |
1137 | ||
1138 | return 0; | |
1139 | ||
1140 | fail: | |
1141 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
1142 | ubi_dbg_dump_stack(); | |
1143 | return 1; | |
1144 | } | |
1145 | ||
1146 | /** | |
ebaaf1af | 1147 | * paranoid_check_peb_ec_hdr - check erase counter header. |
801c135c AB |
1148 | * @ubi: UBI device description object |
1149 | * @pnum: the physical eraseblock number to check | |
1150 | * | |
1151 | * This function returns zero if the erase counter header is all right, %1 if | |
1152 | * not, and a negative error code if an error occurred. | |
1153 | */ | |
1154 | static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum) | |
1155 | { | |
1156 | int err; | |
1157 | uint32_t crc, hdr_crc; | |
1158 | struct ubi_ec_hdr *ec_hdr; | |
1159 | ||
33818bbb | 1160 | ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS); |
801c135c AB |
1161 | if (!ec_hdr) |
1162 | return -ENOMEM; | |
1163 | ||
1164 | err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE); | |
1165 | if (err && err != UBI_IO_BITFLIPS && err != -EBADMSG) | |
1166 | goto exit; | |
1167 | ||
1168 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 1169 | hdr_crc = be32_to_cpu(ec_hdr->hdr_crc); |
801c135c AB |
1170 | if (hdr_crc != crc) { |
1171 | ubi_err("bad CRC, calculated %#08x, read %#08x", crc, hdr_crc); | |
1172 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1173 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
1174 | ubi_dbg_dump_stack(); | |
1175 | err = 1; | |
1176 | goto exit; | |
1177 | } | |
1178 | ||
1179 | err = paranoid_check_ec_hdr(ubi, pnum, ec_hdr); | |
1180 | ||
1181 | exit: | |
1182 | kfree(ec_hdr); | |
1183 | return err; | |
1184 | } | |
1185 | ||
1186 | /** | |
1187 | * paranoid_check_vid_hdr - check that a volume identifier header is all right. | |
1188 | * @ubi: UBI device description object | |
1189 | * @pnum: physical eraseblock number the volume identifier header belongs to | |
1190 | * @vid_hdr: the volume identifier header to check | |
1191 | * | |
1192 | * This function returns zero if the volume identifier header is all right, and | |
1193 | * %1 if not. | |
1194 | */ | |
1195 | static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum, | |
1196 | const struct ubi_vid_hdr *vid_hdr) | |
1197 | { | |
1198 | int err; | |
1199 | uint32_t magic; | |
1200 | ||
3261ebd7 | 1201 | magic = be32_to_cpu(vid_hdr->magic); |
801c135c AB |
1202 | if (magic != UBI_VID_HDR_MAGIC) { |
1203 | ubi_err("bad VID header magic %#08x at PEB %d, must be %#08x", | |
1204 | magic, pnum, UBI_VID_HDR_MAGIC); | |
1205 | goto fail; | |
1206 | } | |
1207 | ||
1208 | err = validate_vid_hdr(ubi, vid_hdr); | |
1209 | if (err) { | |
1210 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1211 | goto fail; | |
1212 | } | |
1213 | ||
1214 | return err; | |
1215 | ||
1216 | fail: | |
1217 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1218 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
1219 | ubi_dbg_dump_stack(); | |
1220 | return 1; | |
1221 | ||
1222 | } | |
1223 | ||
1224 | /** | |
ebaaf1af | 1225 | * paranoid_check_peb_vid_hdr - check volume identifier header. |
801c135c AB |
1226 | * @ubi: UBI device description object |
1227 | * @pnum: the physical eraseblock number to check | |
1228 | * | |
1229 | * This function returns zero if the volume identifier header is all right, | |
1230 | * %1 if not, and a negative error code if an error occurred. | |
1231 | */ | |
1232 | static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum) | |
1233 | { | |
1234 | int err; | |
1235 | uint32_t crc, hdr_crc; | |
1236 | struct ubi_vid_hdr *vid_hdr; | |
1237 | void *p; | |
1238 | ||
33818bbb | 1239 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
1240 | if (!vid_hdr) |
1241 | return -ENOMEM; | |
1242 | ||
1243 | p = (char *)vid_hdr - ubi->vid_hdr_shift; | |
1244 | err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset, | |
1245 | ubi->vid_hdr_alsize); | |
1246 | if (err && err != UBI_IO_BITFLIPS && err != -EBADMSG) | |
1247 | goto exit; | |
1248 | ||
1249 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 1250 | hdr_crc = be32_to_cpu(vid_hdr->hdr_crc); |
801c135c AB |
1251 | if (hdr_crc != crc) { |
1252 | ubi_err("bad VID header CRC at PEB %d, calculated %#08x, " | |
1253 | "read %#08x", pnum, crc, hdr_crc); | |
1254 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1255 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
1256 | ubi_dbg_dump_stack(); | |
1257 | err = 1; | |
1258 | goto exit; | |
1259 | } | |
1260 | ||
1261 | err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr); | |
1262 | ||
1263 | exit: | |
1264 | ubi_free_vid_hdr(ubi, vid_hdr); | |
1265 | return err; | |
1266 | } | |
1267 | ||
1268 | /** | |
40a71a87 | 1269 | * ubi_dbg_check_all_ff - check that a region of flash is empty. |
801c135c AB |
1270 | * @ubi: UBI device description object |
1271 | * @pnum: the physical eraseblock number to check | |
1272 | * @offset: the starting offset within the physical eraseblock to check | |
1273 | * @len: the length of the region to check | |
1274 | * | |
1275 | * This function returns zero if only 0xFF bytes are present at offset | |
1276 | * @offset of the physical eraseblock @pnum, %1 if not, and a negative error | |
1277 | * code if an error occurred. | |
1278 | */ | |
40a71a87 | 1279 | int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len) |
801c135c AB |
1280 | { |
1281 | size_t read; | |
1282 | int err; | |
801c135c AB |
1283 | loff_t addr = (loff_t)pnum * ubi->peb_size + offset; |
1284 | ||
e88d6e10 AB |
1285 | mutex_lock(&ubi->dbg_buf_mutex); |
1286 | err = ubi->mtd->read(ubi->mtd, addr, len, &read, ubi->dbg_peb_buf); | |
801c135c AB |
1287 | if (err && err != -EUCLEAN) { |
1288 | ubi_err("error %d while reading %d bytes from PEB %d:%d, " | |
1289 | "read %zd bytes", err, len, pnum, offset, read); | |
1290 | goto error; | |
1291 | } | |
1292 | ||
e88d6e10 | 1293 | err = check_pattern(ubi->dbg_peb_buf, 0xFF, len); |
801c135c AB |
1294 | if (err == 0) { |
1295 | ubi_err("flash region at PEB %d:%d, length %d does not " | |
1296 | "contain all 0xFF bytes", pnum, offset, len); | |
1297 | goto fail; | |
1298 | } | |
e88d6e10 | 1299 | mutex_unlock(&ubi->dbg_buf_mutex); |
801c135c | 1300 | |
801c135c AB |
1301 | return 0; |
1302 | ||
1303 | fail: | |
1304 | ubi_err("paranoid check failed for PEB %d", pnum); | |
c8566350 | 1305 | ubi_msg("hex dump of the %d-%d region", offset, offset + len); |
6986646b | 1306 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
e88d6e10 | 1307 | ubi->dbg_peb_buf, len, 1); |
801c135c AB |
1308 | err = 1; |
1309 | error: | |
1310 | ubi_dbg_dump_stack(); | |
e88d6e10 | 1311 | mutex_unlock(&ubi->dbg_buf_mutex); |
801c135c AB |
1312 | return err; |
1313 | } | |
1314 | ||
1315 | #endif /* CONFIG_MTD_UBI_DEBUG_PARANOID */ |