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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
801c135c AB |
2 | /* |
3 | * Copyright (c) International Business Machines Corp., 2006 | |
4 | * Copyright (c) Nokia Corporation, 2006, 2007 | |
5 | * | |
801c135c AB |
6 | * Author: Artem Bityutskiy (Битюцкий Артём) |
7 | */ | |
8 | ||
9 | /* | |
85c6e6e2 | 10 | * UBI input/output sub-system. |
801c135c | 11 | * |
85c6e6e2 AB |
12 | * This sub-system provides a uniform way to work with all kinds of the |
13 | * underlying MTD devices. It also implements handy functions for reading and | |
14 | * writing UBI headers. | |
801c135c AB |
15 | * |
16 | * We are trying to have a paranoid mindset and not to trust to what we read | |
85c6e6e2 AB |
17 | * from the flash media in order to be more secure and robust. So this |
18 | * sub-system validates every single header it reads from the flash media. | |
801c135c AB |
19 | * |
20 | * Some words about how the eraseblock headers are stored. | |
21 | * | |
22 | * The erase counter header is always stored at offset zero. By default, the | |
23 | * VID header is stored after the EC header at the closest aligned offset | |
24 | * (i.e. aligned to the minimum I/O unit size). Data starts next to the VID | |
25 | * header at the closest aligned offset. But this default layout may be | |
26 | * changed. For example, for different reasons (e.g., optimization) UBI may be | |
27 | * asked to put the VID header at further offset, and even at an unaligned | |
28 | * offset. Of course, if the offset of the VID header is unaligned, UBI adds | |
29 | * proper padding in front of it. Data offset may also be changed but it has to | |
30 | * be aligned. | |
31 | * | |
32 | * About minimal I/O units. In general, UBI assumes flash device model where | |
33 | * there is only one minimal I/O unit size. E.g., in case of NOR flash it is 1, | |
34 | * in case of NAND flash it is a NAND page, etc. This is reported by MTD in the | |
2fae1312 | 35 | * @ubi->mtd->writesize field. But as an exception, UBI admits use of another |
801c135c AB |
36 | * (smaller) minimal I/O unit size for EC and VID headers to make it possible |
37 | * to do different optimizations. | |
38 | * | |
39 | * This is extremely useful in case of NAND flashes which admit of several | |
40 | * write operations to one NAND page. In this case UBI can fit EC and VID | |
41 | * headers at one NAND page. Thus, UBI may use "sub-page" size as the minimal | |
42 | * I/O unit for the headers (the @ubi->hdrs_min_io_size field). But it still | |
43 | * reports NAND page size (@ubi->min_io_size) as a minimal I/O unit for the UBI | |
44 | * users. | |
45 | * | |
46 | * Example: some Samsung NANDs with 2KiB pages allow 4x 512-byte writes, so | |
47 | * although the minimal I/O unit is 2K, UBI uses 512 bytes for EC and VID | |
48 | * headers. | |
49 | * | |
50 | * Q: why not just to treat sub-page as a minimal I/O unit of this flash | |
51 | * device, e.g., make @ubi->min_io_size = 512 in the example above? | |
52 | * | |
53 | * A: because when writing a sub-page, MTD still writes a full 2K page but the | |
be436f62 SK |
54 | * bytes which are not relevant to the sub-page are 0xFF. So, basically, |
55 | * writing 4x512 sub-pages is 4 times slower than writing one 2KiB NAND page. | |
56 | * Thus, we prefer to use sub-pages only for EC and VID headers. | |
801c135c AB |
57 | * |
58 | * As it was noted above, the VID header may start at a non-aligned offset. | |
59 | * For example, in case of a 2KiB page NAND flash with a 512 bytes sub-page, | |
60 | * the VID header may reside at offset 1984 which is the last 64 bytes of the | |
61 | * last sub-page (EC header is always at offset zero). This causes some | |
62 | * difficulties when reading and writing VID headers. | |
63 | * | |
64 | * Suppose we have a 64-byte buffer and we read a VID header at it. We change | |
65 | * the data and want to write this VID header out. As we can only write in | |
66 | * 512-byte chunks, we have to allocate one more buffer and copy our VID header | |
67 | * to offset 448 of this buffer. | |
68 | * | |
85c6e6e2 AB |
69 | * The I/O sub-system does the following trick in order to avoid this extra |
70 | * copy. It always allocates a @ubi->vid_hdr_alsize bytes buffer for the VID | |
71 | * header and returns a pointer to offset @ubi->vid_hdr_shift of this buffer. | |
72 | * When the VID header is being written out, it shifts the VID header pointer | |
73 | * back and writes the whole sub-page. | |
801c135c AB |
74 | */ |
75 | ||
76 | #include <linux/crc32.h> | |
77 | #include <linux/err.h> | |
5a0e3ad6 | 78 | #include <linux/slab.h> |
801c135c AB |
79 | #include "ubi.h" |
80 | ||
8056eb4a AB |
81 | static int self_check_not_bad(const struct ubi_device *ubi, int pnum); |
82 | static int self_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum); | |
83 | static int self_check_ec_hdr(const struct ubi_device *ubi, int pnum, | |
84 | const struct ubi_ec_hdr *ec_hdr); | |
85 | static int self_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum); | |
86 | static int self_check_vid_hdr(const struct ubi_device *ubi, int pnum, | |
87 | const struct ubi_vid_hdr *vid_hdr); | |
97d6104b AB |
88 | static int self_check_write(struct ubi_device *ubi, const void *buf, int pnum, |
89 | int offset, int len); | |
801c135c AB |
90 | |
91 | /** | |
92 | * ubi_io_read - read data from a physical eraseblock. | |
93 | * @ubi: UBI device description object | |
94 | * @buf: buffer where to store the read data | |
95 | * @pnum: physical eraseblock number to read from | |
96 | * @offset: offset within the physical eraseblock from where to read | |
97 | * @len: how many bytes to read | |
98 | * | |
99 | * This function reads data from offset @offset of physical eraseblock @pnum | |
100 | * and stores the read data in the @buf buffer. The following return codes are | |
101 | * possible: | |
102 | * | |
103 | * o %0 if all the requested data were successfully read; | |
104 | * o %UBI_IO_BITFLIPS if all the requested data were successfully read, but | |
105 | * correctable bit-flips were detected; this is harmless but may indicate | |
106 | * that this eraseblock may become bad soon (but do not have to); | |
63b6c1ed AB |
107 | * o %-EBADMSG if the MTD subsystem reported about data integrity problems, for |
108 | * example it can be an ECC error in case of NAND; this most probably means | |
109 | * that the data is corrupted; | |
801c135c AB |
110 | * o %-EIO if some I/O error occurred; |
111 | * o other negative error codes in case of other errors. | |
112 | */ | |
113 | int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, | |
114 | int len) | |
115 | { | |
116 | int err, retries = 0; | |
117 | size_t read; | |
118 | loff_t addr; | |
119 | ||
120 | dbg_io("read %d bytes from PEB %d:%d", len, pnum, offset); | |
121 | ||
122 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
123 | ubi_assert(offset >= 0 && offset + len <= ubi->peb_size); | |
124 | ubi_assert(len > 0); | |
125 | ||
8056eb4a | 126 | err = self_check_not_bad(ubi, pnum); |
801c135c | 127 | if (err) |
adbf05e3 | 128 | return err; |
801c135c | 129 | |
276832d8 AB |
130 | /* |
131 | * Deliberately corrupt the buffer to improve robustness. Indeed, if we | |
132 | * do not do this, the following may happen: | |
133 | * 1. The buffer contains data from previous operation, e.g., read from | |
134 | * another PEB previously. The data looks like expected, e.g., if we | |
135 | * just do not read anything and return - the caller would not | |
136 | * notice this. E.g., if we are reading a VID header, the buffer may | |
137 | * contain a valid VID header from another PEB. | |
138 | * 2. The driver is buggy and returns us success or -EBADMSG or | |
139 | * -EUCLEAN, but it does not actually put any data to the buffer. | |
140 | * | |
141 | * This may confuse UBI or upper layers - they may think the buffer | |
142 | * contains valid data while in fact it is just old data. This is | |
143 | * especially possible because UBI (and UBIFS) relies on CRC, and | |
144 | * treats data as correct even in case of ECC errors if the CRC is | |
145 | * correct. | |
146 | * | |
147 | * Try to prevent this situation by changing the first byte of the | |
148 | * buffer. | |
149 | */ | |
150 | *((uint8_t *)buf) ^= 0xFF; | |
151 | ||
801c135c AB |
152 | addr = (loff_t)pnum * ubi->peb_size + offset; |
153 | retry: | |
329ad399 | 154 | err = mtd_read(ubi->mtd, addr, len, &read, buf); |
801c135c | 155 | if (err) { |
d57f4054 | 156 | const char *errstr = mtd_is_eccerr(err) ? " (ECC error)" : ""; |
1a49af2c | 157 | |
d57f4054 | 158 | if (mtd_is_bitflip(err)) { |
801c135c AB |
159 | /* |
160 | * -EUCLEAN is reported if there was a bit-flip which | |
161 | * was corrected, so this is harmless. | |
8c1e6ee1 AB |
162 | * |
163 | * We do not report about it here unless debugging is | |
164 | * enabled. A corresponding message will be printed | |
165 | * later, when it is has been scrubbed. | |
801c135c | 166 | */ |
32608703 TB |
167 | ubi_msg(ubi, "fixable bit-flip detected at PEB %d", |
168 | pnum); | |
801c135c AB |
169 | ubi_assert(len == read); |
170 | return UBI_IO_BITFLIPS; | |
171 | } | |
172 | ||
a87f29cb | 173 | if (retries++ < UBI_IO_RETRIES) { |
32608703 | 174 | ubi_warn(ubi, "error %d%s while reading %d bytes from PEB %d:%d, read only %zd bytes, retry", |
f01e2d16 | 175 | err, errstr, len, pnum, offset, read); |
801c135c AB |
176 | yield(); |
177 | goto retry; | |
178 | } | |
179 | ||
32608703 | 180 | ubi_err(ubi, "error %d%s while reading %d bytes from PEB %d:%d, read %zd bytes", |
049333ce | 181 | err, errstr, len, pnum, offset, read); |
25886a36 | 182 | dump_stack(); |
2362a53e AB |
183 | |
184 | /* | |
185 | * The driver should never return -EBADMSG if it failed to read | |
186 | * all the requested data. But some buggy drivers might do | |
187 | * this, so we change it to -EIO. | |
188 | */ | |
d57f4054 | 189 | if (read != len && mtd_is_eccerr(err)) { |
2362a53e AB |
190 | ubi_assert(0); |
191 | err = -EIO; | |
192 | } | |
801c135c AB |
193 | } else { |
194 | ubi_assert(len == read); | |
195 | ||
27a0f2a3 | 196 | if (ubi_dbg_is_bitflip(ubi)) { |
c8566350 | 197 | dbg_gen("bit-flip (emulated)"); |
7cd8d1f8 ZW |
198 | return UBI_IO_BITFLIPS; |
199 | } | |
200 | ||
201 | if (ubi_dbg_is_read_failure(ubi, MASK_READ_FAILURE)) { | |
202 | ubi_warn(ubi, "cannot read %d bytes from PEB %d:%d (emulated)", | |
203 | len, pnum, offset); | |
204 | return -EIO; | |
205 | } | |
206 | ||
207 | if (ubi_dbg_is_eccerr(ubi)) { | |
208 | ubi_warn(ubi, "ECC error (emulated) while reading %d bytes from PEB %d:%d, read %zd bytes", | |
209 | len, pnum, offset, read); | |
210 | return -EBADMSG; | |
801c135c AB |
211 | } |
212 | } | |
213 | ||
214 | return err; | |
215 | } | |
216 | ||
217 | /** | |
218 | * ubi_io_write - write data to a physical eraseblock. | |
219 | * @ubi: UBI device description object | |
220 | * @buf: buffer with the data to write | |
221 | * @pnum: physical eraseblock number to write to | |
222 | * @offset: offset within the physical eraseblock where to write | |
223 | * @len: how many bytes to write | |
224 | * | |
225 | * This function writes @len bytes of data from buffer @buf to offset @offset | |
226 | * of physical eraseblock @pnum. If all the data were successfully written, | |
227 | * zero is returned. If an error occurred, this function returns a negative | |
228 | * error code. If %-EIO is returned, the physical eraseblock most probably went | |
229 | * bad. | |
230 | * | |
231 | * Note, in case of an error, it is possible that something was still written | |
232 | * to the flash media, but may be some garbage. | |
233 | */ | |
e88d6e10 AB |
234 | int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset, |
235 | int len) | |
801c135c AB |
236 | { |
237 | int err; | |
238 | size_t written; | |
239 | loff_t addr; | |
240 | ||
241 | dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset); | |
242 | ||
243 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
244 | ubi_assert(offset >= 0 && offset + len <= ubi->peb_size); | |
245 | ubi_assert(offset % ubi->hdrs_min_io_size == 0); | |
246 | ubi_assert(len > 0 && len % ubi->hdrs_min_io_size == 0); | |
247 | ||
248 | if (ubi->ro_mode) { | |
32608703 | 249 | ubi_err(ubi, "read-only mode"); |
801c135c AB |
250 | return -EROFS; |
251 | } | |
252 | ||
8056eb4a | 253 | err = self_check_not_bad(ubi, pnum); |
801c135c | 254 | if (err) |
adbf05e3 | 255 | return err; |
801c135c AB |
256 | |
257 | /* The area we are writing to has to contain all 0xFF bytes */ | |
97d6104b | 258 | err = ubi_self_check_all_ff(ubi, pnum, offset, len); |
801c135c | 259 | if (err) |
adbf05e3 | 260 | return err; |
801c135c AB |
261 | |
262 | if (offset >= ubi->leb_start) { | |
263 | /* | |
264 | * We write to the data area of the physical eraseblock. Make | |
265 | * sure it has valid EC and VID headers. | |
266 | */ | |
8056eb4a | 267 | err = self_check_peb_ec_hdr(ubi, pnum); |
801c135c | 268 | if (err) |
adbf05e3 | 269 | return err; |
8056eb4a | 270 | err = self_check_peb_vid_hdr(ubi, pnum); |
801c135c | 271 | if (err) |
adbf05e3 | 272 | return err; |
801c135c AB |
273 | } |
274 | ||
27a0f2a3 | 275 | if (ubi_dbg_is_write_failure(ubi)) { |
32608703 | 276 | ubi_err(ubi, "cannot write %d bytes to PEB %d:%d (emulated)", |
049333ce | 277 | len, pnum, offset); |
25886a36 | 278 | dump_stack(); |
801c135c AB |
279 | return -EIO; |
280 | } | |
281 | ||
282 | addr = (loff_t)pnum * ubi->peb_size + offset; | |
eda95cbf | 283 | err = mtd_write(ubi->mtd, addr, len, &written, buf); |
801c135c | 284 | if (err) { |
32608703 | 285 | ubi_err(ubi, "error %d while writing %d bytes to PEB %d:%d, written %zd bytes", |
049333ce | 286 | err, len, pnum, offset, written); |
25886a36 | 287 | dump_stack(); |
ef7088e7 | 288 | ubi_dump_flash(ubi, pnum, offset, len); |
801c135c AB |
289 | } else |
290 | ubi_assert(written == len); | |
291 | ||
6e9065d7 | 292 | if (!err) { |
97d6104b | 293 | err = self_check_write(ubi, buf, pnum, offset, len); |
6e9065d7 AB |
294 | if (err) |
295 | return err; | |
296 | ||
297 | /* | |
298 | * Since we always write sequentially, the rest of the PEB has | |
299 | * to contain only 0xFF bytes. | |
300 | */ | |
301 | offset += len; | |
302 | len = ubi->peb_size - offset; | |
303 | if (len) | |
97d6104b | 304 | err = ubi_self_check_all_ff(ubi, pnum, offset, len); |
6e9065d7 AB |
305 | } |
306 | ||
801c135c AB |
307 | return err; |
308 | } | |
309 | ||
801c135c AB |
310 | /** |
311 | * do_sync_erase - synchronously erase a physical eraseblock. | |
312 | * @ubi: UBI device description object | |
313 | * @pnum: the physical eraseblock number to erase | |
314 | * | |
315 | * This function synchronously erases physical eraseblock @pnum and returns | |
316 | * zero in case of success and a negative error code in case of failure. If | |
317 | * %-EIO is returned, the physical eraseblock most probably went bad. | |
318 | */ | |
e88d6e10 | 319 | static int do_sync_erase(struct ubi_device *ubi, int pnum) |
801c135c AB |
320 | { |
321 | int err, retries = 0; | |
322 | struct erase_info ei; | |
801c135c AB |
323 | |
324 | dbg_io("erase PEB %d", pnum); | |
3efe5090 AB |
325 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); |
326 | ||
327 | if (ubi->ro_mode) { | |
32608703 | 328 | ubi_err(ubi, "read-only mode"); |
3efe5090 AB |
329 | return -EROFS; |
330 | } | |
801c135c AB |
331 | |
332 | retry: | |
801c135c AB |
333 | memset(&ei, 0, sizeof(struct erase_info)); |
334 | ||
2f176f79 | 335 | ei.addr = (loff_t)pnum * ubi->peb_size; |
801c135c | 336 | ei.len = ubi->peb_size; |
801c135c | 337 | |
7e1f0dc0 | 338 | err = mtd_erase(ubi->mtd, &ei); |
801c135c AB |
339 | if (err) { |
340 | if (retries++ < UBI_IO_RETRIES) { | |
32608703 | 341 | ubi_warn(ubi, "error %d while erasing PEB %d, retry", |
f01e2d16 | 342 | err, pnum); |
801c135c AB |
343 | yield(); |
344 | goto retry; | |
345 | } | |
32608703 | 346 | ubi_err(ubi, "cannot erase PEB %d, error %d", pnum, err); |
25886a36 | 347 | dump_stack(); |
801c135c AB |
348 | return err; |
349 | } | |
350 | ||
97d6104b | 351 | err = ubi_self_check_all_ff(ubi, pnum, 0, ubi->peb_size); |
801c135c | 352 | if (err) |
adbf05e3 | 353 | return err; |
801c135c | 354 | |
27a0f2a3 | 355 | if (ubi_dbg_is_erase_failure(ubi)) { |
32608703 | 356 | ubi_err(ubi, "cannot erase PEB %d (emulated)", pnum); |
801c135c AB |
357 | return -EIO; |
358 | } | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
801c135c AB |
363 | /* Patterns to write to a physical eraseblock when torturing it */ |
364 | static uint8_t patterns[] = {0xa5, 0x5a, 0x0}; | |
365 | ||
366 | /** | |
367 | * torture_peb - test a supposedly bad physical eraseblock. | |
368 | * @ubi: UBI device description object | |
369 | * @pnum: the physical eraseblock number to test | |
370 | * | |
371 | * This function returns %-EIO if the physical eraseblock did not pass the | |
372 | * test, a positive number of erase operations done if the test was | |
373 | * successfully passed, and other negative error codes in case of other errors. | |
374 | */ | |
e88d6e10 | 375 | static int torture_peb(struct ubi_device *ubi, int pnum) |
801c135c | 376 | { |
801c135c AB |
377 | int err, i, patt_count; |
378 | ||
32608703 | 379 | ubi_msg(ubi, "run torture test for PEB %d", pnum); |
801c135c AB |
380 | patt_count = ARRAY_SIZE(patterns); |
381 | ubi_assert(patt_count > 0); | |
382 | ||
e88d6e10 | 383 | mutex_lock(&ubi->buf_mutex); |
801c135c AB |
384 | for (i = 0; i < patt_count; i++) { |
385 | err = do_sync_erase(ubi, pnum); | |
386 | if (err) | |
387 | goto out; | |
388 | ||
389 | /* Make sure the PEB contains only 0xFF bytes */ | |
0ca39d74 | 390 | err = ubi_io_read(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size); |
801c135c AB |
391 | if (err) |
392 | goto out; | |
393 | ||
0ca39d74 | 394 | err = ubi_check_pattern(ubi->peb_buf, 0xFF, ubi->peb_size); |
801c135c | 395 | if (err == 0) { |
32608703 | 396 | ubi_err(ubi, "erased PEB %d, but a non-0xFF byte found", |
801c135c AB |
397 | pnum); |
398 | err = -EIO; | |
399 | goto out; | |
400 | } | |
401 | ||
402 | /* Write a pattern and check it */ | |
0ca39d74 AB |
403 | memset(ubi->peb_buf, patterns[i], ubi->peb_size); |
404 | err = ubi_io_write(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size); | |
801c135c AB |
405 | if (err) |
406 | goto out; | |
407 | ||
0ca39d74 AB |
408 | memset(ubi->peb_buf, ~patterns[i], ubi->peb_size); |
409 | err = ubi_io_read(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size); | |
801c135c AB |
410 | if (err) |
411 | goto out; | |
412 | ||
0ca39d74 | 413 | err = ubi_check_pattern(ubi->peb_buf, patterns[i], |
bb00e180 | 414 | ubi->peb_size); |
801c135c | 415 | if (err == 0) { |
32608703 | 416 | ubi_err(ubi, "pattern %x checking failed for PEB %d", |
801c135c AB |
417 | patterns[i], pnum); |
418 | err = -EIO; | |
419 | goto out; | |
420 | } | |
421 | } | |
422 | ||
423 | err = patt_count; | |
32608703 | 424 | ubi_msg(ubi, "PEB %d passed torture test, do not mark it as bad", pnum); |
801c135c AB |
425 | |
426 | out: | |
e88d6e10 | 427 | mutex_unlock(&ubi->buf_mutex); |
d57f4054 | 428 | if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err)) { |
801c135c AB |
429 | /* |
430 | * If a bit-flip or data integrity error was detected, the test | |
431 | * has not passed because it happened on a freshly erased | |
432 | * physical eraseblock which means something is wrong with it. | |
433 | */ | |
32608703 | 434 | ubi_err(ubi, "read problems on freshly erased PEB %d, must be bad", |
8d2d4011 | 435 | pnum); |
801c135c | 436 | err = -EIO; |
8d2d4011 | 437 | } |
801c135c AB |
438 | return err; |
439 | } | |
440 | ||
ebf53f42 AB |
441 | /** |
442 | * nor_erase_prepare - prepare a NOR flash PEB for erasure. | |
443 | * @ubi: UBI device description object | |
444 | * @pnum: physical eraseblock number to prepare | |
445 | * | |
446 | * NOR flash, or at least some of them, have peculiar embedded PEB erasure | |
447 | * algorithm: the PEB is first filled with zeroes, then it is erased. And | |
448 | * filling with zeroes starts from the end of the PEB. This was observed with | |
449 | * Spansion S29GL512N NOR flash. | |
450 | * | |
451 | * This means that in case of a power cut we may end up with intact data at the | |
452 | * beginning of the PEB, and all zeroes at the end of PEB. In other words, the | |
453 | * EC and VID headers are OK, but a large chunk of data at the end of PEB is | |
454 | * zeroed. This makes UBI mistakenly treat this PEB as used and associate it | |
455 | * with an LEB, which leads to subsequent failures (e.g., UBIFS fails). | |
456 | * | |
457 | * This function is called before erasing NOR PEBs and it zeroes out EC and VID | |
458 | * magic numbers in order to invalidate them and prevent the failures. Returns | |
459 | * zero in case of success and a negative error code in case of failure. | |
460 | */ | |
461 | static int nor_erase_prepare(struct ubi_device *ubi, int pnum) | |
462 | { | |
2c7ca5cc | 463 | int err; |
ebf53f42 AB |
464 | size_t written; |
465 | loff_t addr; | |
466 | uint32_t data = 0; | |
2c7ca5cc | 467 | struct ubi_ec_hdr ec_hdr; |
3291b52f | 468 | struct ubi_vid_io_buf vidb; |
2c7ca5cc | 469 | |
2fff570e AB |
470 | /* |
471 | * Note, we cannot generally define VID header buffers on stack, | |
472 | * because of the way we deal with these buffers (see the header | |
473 | * comment in this file). But we know this is a NOR-specific piece of | |
474 | * code, so we can do this. But yes, this is error-prone and we should | |
475 | * (pre-)allocate VID header buffer instead. | |
476 | */ | |
de75c771 | 477 | struct ubi_vid_hdr vid_hdr; |
ebf53f42 | 478 | |
7ac760c2 | 479 | /* |
2c7ca5cc | 480 | * If VID or EC is valid, we have to corrupt them before erasing. |
7ac760c2 AB |
481 | * It is important to first invalidate the EC header, and then the VID |
482 | * header. Otherwise a power cut may lead to valid EC header and | |
483 | * invalid VID header, in which case UBI will treat this PEB as | |
fbd0107f | 484 | * corrupted and will try to preserve it, and print scary warnings. |
7ac760c2 AB |
485 | */ |
486 | addr = (loff_t)pnum * ubi->peb_size; | |
2c7ca5cc QW |
487 | err = ubi_io_read_ec_hdr(ubi, pnum, &ec_hdr, 0); |
488 | if (err != UBI_IO_BAD_HDR_EBADMSG && err != UBI_IO_BAD_HDR && | |
489 | err != UBI_IO_FF){ | |
eda95cbf | 490 | err = mtd_write(ubi->mtd, addr, 4, &written, (void *)&data); |
2c7ca5cc QW |
491 | if(err) |
492 | goto error; | |
ebf53f42 AB |
493 | } |
494 | ||
3291b52f BB |
495 | ubi_init_vid_buf(ubi, &vidb, &vid_hdr); |
496 | ubi_assert(&vid_hdr == ubi_get_vid_hdr(&vidb)); | |
497 | ||
498 | err = ubi_io_read_vid_hdr(ubi, pnum, &vidb, 0); | |
2c7ca5cc QW |
499 | if (err != UBI_IO_BAD_HDR_EBADMSG && err != UBI_IO_BAD_HDR && |
500 | err != UBI_IO_FF){ | |
501 | addr += ubi->vid_hdr_aloffset; | |
502 | err = mtd_write(ubi->mtd, addr, 4, &written, (void *)&data); | |
503 | if (err) | |
504 | goto error; | |
7ac760c2 | 505 | } |
2c7ca5cc | 506 | return 0; |
de75c771 | 507 | |
2c7ca5cc | 508 | error: |
de75c771 | 509 | /* |
2c7ca5cc QW |
510 | * The PEB contains a valid VID or EC header, but we cannot invalidate |
511 | * it. Supposedly the flash media or the driver is screwed up, so | |
512 | * return an error. | |
de75c771 | 513 | */ |
32608703 | 514 | ubi_err(ubi, "cannot invalidate PEB %d, write returned %d", pnum, err); |
ef7088e7 | 515 | ubi_dump_flash(ubi, pnum, 0, ubi->peb_size); |
de75c771 | 516 | return -EIO; |
ebf53f42 AB |
517 | } |
518 | ||
801c135c AB |
519 | /** |
520 | * ubi_io_sync_erase - synchronously erase a physical eraseblock. | |
521 | * @ubi: UBI device description object | |
522 | * @pnum: physical eraseblock number to erase | |
523 | * @torture: if this physical eraseblock has to be tortured | |
524 | * | |
525 | * This function synchronously erases physical eraseblock @pnum. If @torture | |
526 | * flag is not zero, the physical eraseblock is checked by means of writing | |
527 | * different patterns to it and reading them back. If the torturing is enabled, | |
025dfdaf | 528 | * the physical eraseblock is erased more than once. |
801c135c AB |
529 | * |
530 | * This function returns the number of erasures made in case of success, %-EIO | |
531 | * if the erasure failed or the torturing test failed, and other negative error | |
532 | * codes in case of other errors. Note, %-EIO means that the physical | |
533 | * eraseblock is bad. | |
534 | */ | |
e88d6e10 | 535 | int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture) |
801c135c AB |
536 | { |
537 | int err, ret = 0; | |
538 | ||
539 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
540 | ||
8056eb4a | 541 | err = self_check_not_bad(ubi, pnum); |
801c135c | 542 | if (err != 0) |
adbf05e3 | 543 | return err; |
801c135c AB |
544 | |
545 | if (ubi->ro_mode) { | |
32608703 | 546 | ubi_err(ubi, "read-only mode"); |
801c135c AB |
547 | return -EROFS; |
548 | } | |
549 | ||
f669e74b PY |
550 | /* |
551 | * If the flash is ECC-ed then we have to erase the ECC block before we | |
552 | * can write to it. But the write is in preparation to an erase in the | |
553 | * first place. This means we cannot zero out EC and VID before the | |
554 | * erase and we just have to hope the flash starts erasing from the | |
555 | * start of the page. | |
556 | */ | |
557 | if (ubi->nor_flash && ubi->mtd->writesize == 1) { | |
ebf53f42 AB |
558 | err = nor_erase_prepare(ubi, pnum); |
559 | if (err) | |
560 | return err; | |
561 | } | |
562 | ||
801c135c AB |
563 | if (torture) { |
564 | ret = torture_peb(ubi, pnum); | |
565 | if (ret < 0) | |
566 | return ret; | |
567 | } | |
568 | ||
569 | err = do_sync_erase(ubi, pnum); | |
570 | if (err) | |
571 | return err; | |
572 | ||
573 | return ret + 1; | |
574 | } | |
575 | ||
576 | /** | |
577 | * ubi_io_is_bad - check if a physical eraseblock is bad. | |
578 | * @ubi: UBI device description object | |
579 | * @pnum: the physical eraseblock number to check | |
580 | * | |
581 | * This function returns a positive number if the physical eraseblock is bad, | |
582 | * zero if not, and a negative error code if an error occurred. | |
583 | */ | |
584 | int ubi_io_is_bad(const struct ubi_device *ubi, int pnum) | |
585 | { | |
586 | struct mtd_info *mtd = ubi->mtd; | |
587 | ||
588 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
589 | ||
590 | if (ubi->bad_allowed) { | |
591 | int ret; | |
592 | ||
7086c19d | 593 | ret = mtd_block_isbad(mtd, (loff_t)pnum * ubi->peb_size); |
801c135c | 594 | if (ret < 0) |
32608703 | 595 | ubi_err(ubi, "error %d while checking if PEB %d is bad", |
801c135c AB |
596 | ret, pnum); |
597 | else if (ret) | |
598 | dbg_io("PEB %d is bad", pnum); | |
599 | return ret; | |
600 | } | |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
605 | /** | |
606 | * ubi_io_mark_bad - mark a physical eraseblock as bad. | |
607 | * @ubi: UBI device description object | |
608 | * @pnum: the physical eraseblock number to mark | |
609 | * | |
610 | * This function returns zero in case of success and a negative error code in | |
611 | * case of failure. | |
612 | */ | |
613 | int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum) | |
614 | { | |
615 | int err; | |
616 | struct mtd_info *mtd = ubi->mtd; | |
617 | ||
618 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
619 | ||
620 | if (ubi->ro_mode) { | |
32608703 | 621 | ubi_err(ubi, "read-only mode"); |
801c135c AB |
622 | return -EROFS; |
623 | } | |
624 | ||
625 | if (!ubi->bad_allowed) | |
626 | return 0; | |
627 | ||
5942ddbc | 628 | err = mtd_block_markbad(mtd, (loff_t)pnum * ubi->peb_size); |
801c135c | 629 | if (err) |
32608703 | 630 | ubi_err(ubi, "cannot mark PEB %d bad, error %d", pnum, err); |
801c135c AB |
631 | return err; |
632 | } | |
633 | ||
634 | /** | |
635 | * validate_ec_hdr - validate an erase counter header. | |
636 | * @ubi: UBI device description object | |
637 | * @ec_hdr: the erase counter header to check | |
638 | * | |
639 | * This function returns zero if the erase counter header is OK, and %1 if | |
640 | * not. | |
641 | */ | |
fe96efc1 | 642 | static int validate_ec_hdr(const struct ubi_device *ubi, |
801c135c AB |
643 | const struct ubi_ec_hdr *ec_hdr) |
644 | { | |
645 | long long ec; | |
fe96efc1 | 646 | int vid_hdr_offset, leb_start; |
801c135c | 647 | |
3261ebd7 CH |
648 | ec = be64_to_cpu(ec_hdr->ec); |
649 | vid_hdr_offset = be32_to_cpu(ec_hdr->vid_hdr_offset); | |
650 | leb_start = be32_to_cpu(ec_hdr->data_offset); | |
801c135c AB |
651 | |
652 | if (ec_hdr->version != UBI_VERSION) { | |
32608703 | 653 | ubi_err(ubi, "node with incompatible UBI version found: this UBI version is %d, image version is %d", |
801c135c AB |
654 | UBI_VERSION, (int)ec_hdr->version); |
655 | goto bad; | |
656 | } | |
657 | ||
658 | if (vid_hdr_offset != ubi->vid_hdr_offset) { | |
32608703 | 659 | ubi_err(ubi, "bad VID header offset %d, expected %d", |
801c135c AB |
660 | vid_hdr_offset, ubi->vid_hdr_offset); |
661 | goto bad; | |
662 | } | |
663 | ||
664 | if (leb_start != ubi->leb_start) { | |
32608703 | 665 | ubi_err(ubi, "bad data offset %d, expected %d", |
801c135c AB |
666 | leb_start, ubi->leb_start); |
667 | goto bad; | |
668 | } | |
669 | ||
670 | if (ec < 0 || ec > UBI_MAX_ERASECOUNTER) { | |
32608703 | 671 | ubi_err(ubi, "bad erase counter %lld", ec); |
801c135c AB |
672 | goto bad; |
673 | } | |
674 | ||
675 | return 0; | |
676 | ||
677 | bad: | |
32608703 | 678 | ubi_err(ubi, "bad EC header"); |
a904e3f1 | 679 | ubi_dump_ec_hdr(ec_hdr); |
25886a36 | 680 | dump_stack(); |
801c135c AB |
681 | return 1; |
682 | } | |
683 | ||
684 | /** | |
685 | * ubi_io_read_ec_hdr - read and check an erase counter header. | |
686 | * @ubi: UBI device description object | |
687 | * @pnum: physical eraseblock to read from | |
688 | * @ec_hdr: a &struct ubi_ec_hdr object where to store the read erase counter | |
689 | * header | |
690 | * @verbose: be verbose if the header is corrupted or was not found | |
691 | * | |
692 | * This function reads erase counter header from physical eraseblock @pnum and | |
693 | * stores it in @ec_hdr. This function also checks CRC checksum of the read | |
694 | * erase counter header. The following codes may be returned: | |
695 | * | |
696 | * o %0 if the CRC checksum is correct and the header was successfully read; | |
697 | * o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected | |
698 | * and corrected by the flash driver; this is harmless but may indicate that | |
699 | * this eraseblock may become bad soon (but may be not); | |
786d7831 | 700 | * o %UBI_IO_BAD_HDR if the erase counter header is corrupted (a CRC error); |
756e1df1 AB |
701 | * o %UBI_IO_BAD_HDR_EBADMSG is the same as %UBI_IO_BAD_HDR, but there also was |
702 | * a data integrity error (uncorrectable ECC error in case of NAND); | |
74d82d26 | 703 | * o %UBI_IO_FF if only 0xFF bytes were read (the PEB is supposedly empty) |
801c135c AB |
704 | * o a negative error code in case of failure. |
705 | */ | |
e88d6e10 | 706 | int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
707 | struct ubi_ec_hdr *ec_hdr, int verbose) |
708 | { | |
92e1a7d9 | 709 | int err, read_err; |
801c135c AB |
710 | uint32_t crc, magic, hdr_crc; |
711 | ||
712 | dbg_io("read EC header from PEB %d", pnum); | |
713 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
714 | ||
92e1a7d9 AB |
715 | read_err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE); |
716 | if (read_err) { | |
d57f4054 | 717 | if (read_err != UBI_IO_BITFLIPS && !mtd_is_eccerr(read_err)) |
92e1a7d9 | 718 | return read_err; |
801c135c AB |
719 | |
720 | /* | |
721 | * We read all the data, but either a correctable bit-flip | |
756e1df1 AB |
722 | * occurred, or MTD reported a data integrity error |
723 | * (uncorrectable ECC error in case of NAND). The former is | |
724 | * harmless, the later may mean that the read data is | |
725 | * corrupted. But we have a CRC check-sum and we will detect | |
726 | * this. If the EC header is still OK, we just report this as | |
727 | * there was a bit-flip, to force scrubbing. | |
801c135c | 728 | */ |
801c135c AB |
729 | } |
730 | ||
3261ebd7 | 731 | magic = be32_to_cpu(ec_hdr->magic); |
801c135c | 732 | if (magic != UBI_EC_HDR_MAGIC) { |
d57f4054 | 733 | if (mtd_is_eccerr(read_err)) |
92e1a7d9 | 734 | return UBI_IO_BAD_HDR_EBADMSG; |
eb89580e | 735 | |
801c135c AB |
736 | /* |
737 | * The magic field is wrong. Let's check if we have read all | |
738 | * 0xFF. If yes, this physical eraseblock is assumed to be | |
739 | * empty. | |
801c135c | 740 | */ |
bb00e180 | 741 | if (ubi_check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) { |
801c135c | 742 | /* The physical eraseblock is supposedly empty */ |
801c135c | 743 | if (verbose) |
32608703 | 744 | ubi_warn(ubi, "no EC header found at PEB %d, only 0xFF bytes", |
049333ce AB |
745 | pnum); |
746 | dbg_bld("no EC header found at PEB %d, only 0xFF bytes", | |
747 | pnum); | |
92e1a7d9 AB |
748 | if (!read_err) |
749 | return UBI_IO_FF; | |
750 | else | |
751 | return UBI_IO_FF_BITFLIPS; | |
801c135c AB |
752 | } |
753 | ||
754 | /* | |
755 | * This is not a valid erase counter header, and these are not | |
756 | * 0xFF bytes. Report that the header is corrupted. | |
757 | */ | |
758 | if (verbose) { | |
32608703 | 759 | ubi_warn(ubi, "bad magic number at PEB %d: %08x instead of %08x", |
049333ce | 760 | pnum, magic, UBI_EC_HDR_MAGIC); |
a904e3f1 | 761 | ubi_dump_ec_hdr(ec_hdr); |
6f9fdf62 | 762 | } |
049333ce AB |
763 | dbg_bld("bad magic number at PEB %d: %08x instead of %08x", |
764 | pnum, magic, UBI_EC_HDR_MAGIC); | |
786d7831 | 765 | return UBI_IO_BAD_HDR; |
801c135c AB |
766 | } |
767 | ||
768 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 769 | hdr_crc = be32_to_cpu(ec_hdr->hdr_crc); |
801c135c AB |
770 | |
771 | if (hdr_crc != crc) { | |
772 | if (verbose) { | |
32608703 | 773 | ubi_warn(ubi, "bad EC header CRC at PEB %d, calculated %#08x, read %#08x", |
049333ce | 774 | pnum, crc, hdr_crc); |
a904e3f1 | 775 | ubi_dump_ec_hdr(ec_hdr); |
6f9fdf62 | 776 | } |
049333ce AB |
777 | dbg_bld("bad EC header CRC at PEB %d, calculated %#08x, read %#08x", |
778 | pnum, crc, hdr_crc); | |
92e1a7d9 AB |
779 | |
780 | if (!read_err) | |
781 | return UBI_IO_BAD_HDR; | |
782 | else | |
783 | return UBI_IO_BAD_HDR_EBADMSG; | |
801c135c AB |
784 | } |
785 | ||
786 | /* And of course validate what has just been read from the media */ | |
787 | err = validate_ec_hdr(ubi, ec_hdr); | |
788 | if (err) { | |
32608703 | 789 | ubi_err(ubi, "validation failed for PEB %d", pnum); |
801c135c AB |
790 | return -EINVAL; |
791 | } | |
792 | ||
eb89580e AB |
793 | /* |
794 | * If there was %-EBADMSG, but the header CRC is still OK, report about | |
795 | * a bit-flip to force scrubbing on this PEB. | |
796 | */ | |
7cd8d1f8 ZW |
797 | if (read_err) |
798 | return UBI_IO_BITFLIPS; | |
799 | ||
800 | if (ubi_dbg_is_read_failure(ubi, MASK_READ_FAILURE_EC)) { | |
801 | ubi_warn(ubi, "cannot read EC header from PEB %d (emulated)", | |
802 | pnum); | |
803 | return -EIO; | |
804 | } | |
805 | ||
806 | if (ubi_dbg_is_ff(ubi, MASK_IO_FF_EC)) { | |
807 | ubi_warn(ubi, "bit-all-ff (emulated)"); | |
808 | return UBI_IO_FF; | |
809 | } | |
810 | ||
811 | if (ubi_dbg_is_ff_bitflips(ubi, MASK_IO_FF_BITFLIPS_EC)) { | |
812 | ubi_warn(ubi, "bit-all-ff with error reported by MTD driver (emulated)"); | |
813 | return UBI_IO_FF_BITFLIPS; | |
814 | } | |
815 | ||
816 | if (ubi_dbg_is_bad_hdr(ubi, MASK_BAD_HDR_EC)) { | |
817 | ubi_warn(ubi, "bad_hdr (emulated)"); | |
818 | return UBI_IO_BAD_HDR; | |
819 | } | |
820 | ||
821 | if (ubi_dbg_is_bad_hdr_ebadmsg(ubi, MASK_BAD_HDR_EBADMSG_EC)) { | |
822 | ubi_warn(ubi, "bad_hdr with ECC error (emulated)"); | |
823 | return UBI_IO_BAD_HDR_EBADMSG; | |
824 | } | |
825 | ||
826 | return 0; | |
801c135c AB |
827 | } |
828 | ||
829 | /** | |
830 | * ubi_io_write_ec_hdr - write an erase counter header. | |
831 | * @ubi: UBI device description object | |
832 | * @pnum: physical eraseblock to write to | |
833 | * @ec_hdr: the erase counter header to write | |
834 | * | |
835 | * This function writes erase counter header described by @ec_hdr to physical | |
836 | * eraseblock @pnum. It also fills most fields of @ec_hdr before writing, so | |
837 | * the caller do not have to fill them. Callers must only fill the @ec_hdr->ec | |
838 | * field. | |
839 | * | |
840 | * This function returns zero in case of success and a negative error code in | |
841 | * case of failure. If %-EIO is returned, the physical eraseblock most probably | |
842 | * went bad. | |
843 | */ | |
e88d6e10 | 844 | int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
845 | struct ubi_ec_hdr *ec_hdr) |
846 | { | |
847 | int err; | |
848 | uint32_t crc; | |
849 | ||
850 | dbg_io("write EC header to PEB %d", pnum); | |
851 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
852 | ||
3261ebd7 | 853 | ec_hdr->magic = cpu_to_be32(UBI_EC_HDR_MAGIC); |
801c135c | 854 | ec_hdr->version = UBI_VERSION; |
3261ebd7 CH |
855 | ec_hdr->vid_hdr_offset = cpu_to_be32(ubi->vid_hdr_offset); |
856 | ec_hdr->data_offset = cpu_to_be32(ubi->leb_start); | |
0c6c7fa1 | 857 | ec_hdr->image_seq = cpu_to_be32(ubi->image_seq); |
801c135c | 858 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); |
3261ebd7 | 859 | ec_hdr->hdr_crc = cpu_to_be32(crc); |
801c135c | 860 | |
8056eb4a | 861 | err = self_check_ec_hdr(ubi, pnum, ec_hdr); |
801c135c | 862 | if (err) |
adbf05e3 | 863 | return err; |
801c135c | 864 | |
6931fb44 ZW |
865 | if (ubi_dbg_is_power_cut(ubi, MASK_POWER_CUT_EC)) { |
866 | ubi_warn(ubi, "emulating a power cut when writing EC header"); | |
867 | ubi_ro_mode(ubi); | |
50269067 | 868 | return -EROFS; |
6931fb44 | 869 | } |
50269067 | 870 | |
801c135c AB |
871 | err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize); |
872 | return err; | |
873 | } | |
874 | ||
875 | /** | |
876 | * validate_vid_hdr - validate a volume identifier header. | |
877 | * @ubi: UBI device description object | |
878 | * @vid_hdr: the volume identifier header to check | |
879 | * | |
880 | * This function checks that data stored in the volume identifier header | |
881 | * @vid_hdr. Returns zero if the VID header is OK and %1 if not. | |
882 | */ | |
883 | static int validate_vid_hdr(const struct ubi_device *ubi, | |
884 | const struct ubi_vid_hdr *vid_hdr) | |
885 | { | |
886 | int vol_type = vid_hdr->vol_type; | |
887 | int copy_flag = vid_hdr->copy_flag; | |
3261ebd7 CH |
888 | int vol_id = be32_to_cpu(vid_hdr->vol_id); |
889 | int lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c | 890 | int compat = vid_hdr->compat; |
3261ebd7 CH |
891 | int data_size = be32_to_cpu(vid_hdr->data_size); |
892 | int used_ebs = be32_to_cpu(vid_hdr->used_ebs); | |
893 | int data_pad = be32_to_cpu(vid_hdr->data_pad); | |
894 | int data_crc = be32_to_cpu(vid_hdr->data_crc); | |
801c135c AB |
895 | int usable_leb_size = ubi->leb_size - data_pad; |
896 | ||
897 | if (copy_flag != 0 && copy_flag != 1) { | |
32608703 | 898 | ubi_err(ubi, "bad copy_flag"); |
801c135c AB |
899 | goto bad; |
900 | } | |
901 | ||
902 | if (vol_id < 0 || lnum < 0 || data_size < 0 || used_ebs < 0 || | |
903 | data_pad < 0) { | |
32608703 | 904 | ubi_err(ubi, "negative values"); |
801c135c AB |
905 | goto bad; |
906 | } | |
907 | ||
908 | if (vol_id >= UBI_MAX_VOLUMES && vol_id < UBI_INTERNAL_VOL_START) { | |
32608703 | 909 | ubi_err(ubi, "bad vol_id"); |
801c135c AB |
910 | goto bad; |
911 | } | |
912 | ||
913 | if (vol_id < UBI_INTERNAL_VOL_START && compat != 0) { | |
32608703 | 914 | ubi_err(ubi, "bad compat"); |
801c135c AB |
915 | goto bad; |
916 | } | |
917 | ||
918 | if (vol_id >= UBI_INTERNAL_VOL_START && compat != UBI_COMPAT_DELETE && | |
919 | compat != UBI_COMPAT_RO && compat != UBI_COMPAT_PRESERVE && | |
920 | compat != UBI_COMPAT_REJECT) { | |
32608703 | 921 | ubi_err(ubi, "bad compat"); |
801c135c AB |
922 | goto bad; |
923 | } | |
924 | ||
925 | if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) { | |
32608703 | 926 | ubi_err(ubi, "bad vol_type"); |
801c135c AB |
927 | goto bad; |
928 | } | |
929 | ||
930 | if (data_pad >= ubi->leb_size / 2) { | |
32608703 | 931 | ubi_err(ubi, "bad data_pad"); |
801c135c AB |
932 | goto bad; |
933 | } | |
934 | ||
281fda27 RW |
935 | if (data_size > ubi->leb_size) { |
936 | ubi_err(ubi, "bad data_size"); | |
937 | goto bad; | |
938 | } | |
939 | ||
801c135c AB |
940 | if (vol_type == UBI_VID_STATIC) { |
941 | /* | |
942 | * Although from high-level point of view static volumes may | |
943 | * contain zero bytes of data, but no VID headers can contain | |
944 | * zero at these fields, because they empty volumes do not have | |
945 | * mapped logical eraseblocks. | |
946 | */ | |
947 | if (used_ebs == 0) { | |
32608703 | 948 | ubi_err(ubi, "zero used_ebs"); |
801c135c AB |
949 | goto bad; |
950 | } | |
951 | if (data_size == 0) { | |
32608703 | 952 | ubi_err(ubi, "zero data_size"); |
801c135c AB |
953 | goto bad; |
954 | } | |
955 | if (lnum < used_ebs - 1) { | |
956 | if (data_size != usable_leb_size) { | |
32608703 | 957 | ubi_err(ubi, "bad data_size"); |
801c135c AB |
958 | goto bad; |
959 | } | |
cf0838df | 960 | } else if (lnum > used_ebs - 1) { |
32608703 | 961 | ubi_err(ubi, "too high lnum"); |
801c135c AB |
962 | goto bad; |
963 | } | |
964 | } else { | |
965 | if (copy_flag == 0) { | |
966 | if (data_crc != 0) { | |
32608703 | 967 | ubi_err(ubi, "non-zero data CRC"); |
801c135c AB |
968 | goto bad; |
969 | } | |
970 | if (data_size != 0) { | |
32608703 | 971 | ubi_err(ubi, "non-zero data_size"); |
801c135c AB |
972 | goto bad; |
973 | } | |
974 | } else { | |
975 | if (data_size == 0) { | |
32608703 | 976 | ubi_err(ubi, "zero data_size of copy"); |
801c135c AB |
977 | goto bad; |
978 | } | |
979 | } | |
980 | if (used_ebs != 0) { | |
32608703 | 981 | ubi_err(ubi, "bad used_ebs"); |
801c135c AB |
982 | goto bad; |
983 | } | |
984 | } | |
985 | ||
986 | return 0; | |
987 | ||
988 | bad: | |
32608703 | 989 | ubi_err(ubi, "bad VID header"); |
a904e3f1 | 990 | ubi_dump_vid_hdr(vid_hdr); |
25886a36 | 991 | dump_stack(); |
801c135c AB |
992 | return 1; |
993 | } | |
994 | ||
995 | /** | |
996 | * ubi_io_read_vid_hdr - read and check a volume identifier header. | |
997 | * @ubi: UBI device description object | |
998 | * @pnum: physical eraseblock number to read from | |
3291b52f | 999 | * @vidb: the volume identifier buffer to store data in |
801c135c AB |
1000 | * @verbose: be verbose if the header is corrupted or wasn't found |
1001 | * | |
1002 | * This function reads the volume identifier header from physical eraseblock | |
3291b52f | 1003 | * @pnum and stores it in @vidb. It also checks CRC checksum of the read |
74d82d26 AB |
1004 | * volume identifier header. The error codes are the same as in |
1005 | * 'ubi_io_read_ec_hdr()'. | |
801c135c | 1006 | * |
74d82d26 AB |
1007 | * Note, the implementation of this function is also very similar to |
1008 | * 'ubi_io_read_ec_hdr()', so refer commentaries in 'ubi_io_read_ec_hdr()'. | |
801c135c | 1009 | */ |
e88d6e10 | 1010 | int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, |
3291b52f | 1011 | struct ubi_vid_io_buf *vidb, int verbose) |
801c135c | 1012 | { |
92e1a7d9 | 1013 | int err, read_err; |
801c135c | 1014 | uint32_t crc, magic, hdr_crc; |
3291b52f BB |
1015 | struct ubi_vid_hdr *vid_hdr = ubi_get_vid_hdr(vidb); |
1016 | void *p = vidb->buffer; | |
801c135c AB |
1017 | |
1018 | dbg_io("read VID header from PEB %d", pnum); | |
1019 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
1020 | ||
92e1a7d9 | 1021 | read_err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset, |
8a8e8d2f | 1022 | ubi->vid_hdr_shift + UBI_VID_HDR_SIZE); |
d57f4054 | 1023 | if (read_err && read_err != UBI_IO_BITFLIPS && !mtd_is_eccerr(read_err)) |
92e1a7d9 | 1024 | return read_err; |
801c135c | 1025 | |
3261ebd7 | 1026 | magic = be32_to_cpu(vid_hdr->magic); |
801c135c | 1027 | if (magic != UBI_VID_HDR_MAGIC) { |
d57f4054 | 1028 | if (mtd_is_eccerr(read_err)) |
92e1a7d9 | 1029 | return UBI_IO_BAD_HDR_EBADMSG; |
eb89580e | 1030 | |
bb00e180 | 1031 | if (ubi_check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) { |
801c135c | 1032 | if (verbose) |
32608703 | 1033 | ubi_warn(ubi, "no VID header found at PEB %d, only 0xFF bytes", |
049333ce AB |
1034 | pnum); |
1035 | dbg_bld("no VID header found at PEB %d, only 0xFF bytes", | |
1036 | pnum); | |
92e1a7d9 AB |
1037 | if (!read_err) |
1038 | return UBI_IO_FF; | |
1039 | else | |
1040 | return UBI_IO_FF_BITFLIPS; | |
801c135c AB |
1041 | } |
1042 | ||
801c135c | 1043 | if (verbose) { |
32608703 | 1044 | ubi_warn(ubi, "bad magic number at PEB %d: %08x instead of %08x", |
049333ce | 1045 | pnum, magic, UBI_VID_HDR_MAGIC); |
a904e3f1 | 1046 | ubi_dump_vid_hdr(vid_hdr); |
6f9fdf62 | 1047 | } |
049333ce AB |
1048 | dbg_bld("bad magic number at PEB %d: %08x instead of %08x", |
1049 | pnum, magic, UBI_VID_HDR_MAGIC); | |
786d7831 | 1050 | return UBI_IO_BAD_HDR; |
801c135c AB |
1051 | } |
1052 | ||
1053 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); | |
3261ebd7 | 1054 | hdr_crc = be32_to_cpu(vid_hdr->hdr_crc); |
801c135c AB |
1055 | |
1056 | if (hdr_crc != crc) { | |
1057 | if (verbose) { | |
32608703 | 1058 | ubi_warn(ubi, "bad CRC at PEB %d, calculated %#08x, read %#08x", |
049333ce | 1059 | pnum, crc, hdr_crc); |
a904e3f1 | 1060 | ubi_dump_vid_hdr(vid_hdr); |
6f9fdf62 | 1061 | } |
049333ce AB |
1062 | dbg_bld("bad CRC at PEB %d, calculated %#08x, read %#08x", |
1063 | pnum, crc, hdr_crc); | |
92e1a7d9 AB |
1064 | if (!read_err) |
1065 | return UBI_IO_BAD_HDR; | |
1066 | else | |
1067 | return UBI_IO_BAD_HDR_EBADMSG; | |
801c135c AB |
1068 | } |
1069 | ||
801c135c AB |
1070 | err = validate_vid_hdr(ubi, vid_hdr); |
1071 | if (err) { | |
32608703 | 1072 | ubi_err(ubi, "validation failed for PEB %d", pnum); |
801c135c AB |
1073 | return -EINVAL; |
1074 | } | |
1075 | ||
7cd8d1f8 ZW |
1076 | if (read_err) |
1077 | return UBI_IO_BITFLIPS; | |
1078 | ||
1079 | if (ubi_dbg_is_read_failure(ubi, MASK_READ_FAILURE_VID)) { | |
1080 | ubi_warn(ubi, "cannot read VID header from PEB %d (emulated)", | |
1081 | pnum); | |
1082 | return -EIO; | |
1083 | } | |
1084 | ||
1085 | if (ubi_dbg_is_ff(ubi, MASK_IO_FF_VID)) { | |
1086 | ubi_warn(ubi, "bit-all-ff (emulated)"); | |
1087 | return UBI_IO_FF; | |
1088 | } | |
1089 | ||
1090 | if (ubi_dbg_is_ff_bitflips(ubi, MASK_IO_FF_BITFLIPS_VID)) { | |
1091 | ubi_warn(ubi, "bit-all-ff with error reported by MTD driver (emulated)"); | |
1092 | return UBI_IO_FF_BITFLIPS; | |
1093 | } | |
1094 | ||
1095 | if (ubi_dbg_is_bad_hdr(ubi, MASK_BAD_HDR_VID)) { | |
1096 | ubi_warn(ubi, "bad_hdr (emulated)"); | |
1097 | return UBI_IO_BAD_HDR; | |
1098 | } | |
1099 | ||
1100 | if (ubi_dbg_is_bad_hdr_ebadmsg(ubi, MASK_BAD_HDR_EBADMSG_VID)) { | |
1101 | ubi_warn(ubi, "bad_hdr with ECC error (emulated)"); | |
1102 | return UBI_IO_BAD_HDR_EBADMSG; | |
1103 | } | |
1104 | ||
1105 | return 0; | |
801c135c AB |
1106 | } |
1107 | ||
1108 | /** | |
1109 | * ubi_io_write_vid_hdr - write a volume identifier header. | |
1110 | * @ubi: UBI device description object | |
1111 | * @pnum: the physical eraseblock number to write to | |
3291b52f | 1112 | * @vidb: the volume identifier buffer to write |
801c135c AB |
1113 | * |
1114 | * This function writes the volume identifier header described by @vid_hdr to | |
1115 | * physical eraseblock @pnum. This function automatically fills the | |
3291b52f BB |
1116 | * @vidb->hdr->magic and the @vidb->hdr->version fields, as well as calculates |
1117 | * header CRC checksum and stores it at vidb->hdr->hdr_crc. | |
801c135c AB |
1118 | * |
1119 | * This function returns zero in case of success and a negative error code in | |
1120 | * case of failure. If %-EIO is returned, the physical eraseblock probably went | |
1121 | * bad. | |
1122 | */ | |
e88d6e10 | 1123 | int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, |
3291b52f | 1124 | struct ubi_vid_io_buf *vidb) |
801c135c | 1125 | { |
3291b52f | 1126 | struct ubi_vid_hdr *vid_hdr = ubi_get_vid_hdr(vidb); |
801c135c AB |
1127 | int err; |
1128 | uint32_t crc; | |
3291b52f | 1129 | void *p = vidb->buffer; |
801c135c AB |
1130 | |
1131 | dbg_io("write VID header to PEB %d", pnum); | |
1132 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
1133 | ||
8056eb4a | 1134 | err = self_check_peb_ec_hdr(ubi, pnum); |
801c135c | 1135 | if (err) |
adbf05e3 | 1136 | return err; |
801c135c | 1137 | |
3261ebd7 | 1138 | vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC); |
801c135c AB |
1139 | vid_hdr->version = UBI_VERSION; |
1140 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); | |
3261ebd7 | 1141 | vid_hdr->hdr_crc = cpu_to_be32(crc); |
801c135c | 1142 | |
8056eb4a | 1143 | err = self_check_vid_hdr(ubi, pnum, vid_hdr); |
801c135c | 1144 | if (err) |
adbf05e3 | 1145 | return err; |
801c135c | 1146 | |
6931fb44 ZW |
1147 | if (ubi_dbg_is_power_cut(ubi, MASK_POWER_CUT_VID)) { |
1148 | ubi_warn(ubi, "emulating a power cut when writing VID header"); | |
1149 | ubi_ro_mode(ubi); | |
50269067 | 1150 | return -EROFS; |
6931fb44 | 1151 | } |
50269067 | 1152 | |
801c135c AB |
1153 | err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset, |
1154 | ubi->vid_hdr_alsize); | |
1155 | return err; | |
1156 | } | |
1157 | ||
801c135c | 1158 | /** |
8056eb4a | 1159 | * self_check_not_bad - ensure that a physical eraseblock is not bad. |
801c135c AB |
1160 | * @ubi: UBI device description object |
1161 | * @pnum: physical eraseblock number to check | |
1162 | * | |
adbf05e3 AB |
1163 | * This function returns zero if the physical eraseblock is good, %-EINVAL if |
1164 | * it is bad and a negative error code if an error occurred. | |
801c135c | 1165 | */ |
8056eb4a | 1166 | static int self_check_not_bad(const struct ubi_device *ubi, int pnum) |
801c135c AB |
1167 | { |
1168 | int err; | |
1169 | ||
64575574 | 1170 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1171 | return 0; |
1172 | ||
801c135c AB |
1173 | err = ubi_io_is_bad(ubi, pnum); |
1174 | if (!err) | |
1175 | return err; | |
1176 | ||
32608703 | 1177 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
25886a36 | 1178 | dump_stack(); |
adbf05e3 | 1179 | return err > 0 ? -EINVAL : err; |
801c135c AB |
1180 | } |
1181 | ||
1182 | /** | |
8056eb4a | 1183 | * self_check_ec_hdr - check if an erase counter header is all right. |
801c135c AB |
1184 | * @ubi: UBI device description object |
1185 | * @pnum: physical eraseblock number the erase counter header belongs to | |
1186 | * @ec_hdr: the erase counter header to check | |
1187 | * | |
1188 | * This function returns zero if the erase counter header contains valid | |
adbf05e3 | 1189 | * values, and %-EINVAL if not. |
801c135c | 1190 | */ |
8056eb4a AB |
1191 | static int self_check_ec_hdr(const struct ubi_device *ubi, int pnum, |
1192 | const struct ubi_ec_hdr *ec_hdr) | |
801c135c AB |
1193 | { |
1194 | int err; | |
1195 | uint32_t magic; | |
1196 | ||
64575574 | 1197 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1198 | return 0; |
1199 | ||
3261ebd7 | 1200 | magic = be32_to_cpu(ec_hdr->magic); |
801c135c | 1201 | if (magic != UBI_EC_HDR_MAGIC) { |
32608703 | 1202 | ubi_err(ubi, "bad magic %#08x, must be %#08x", |
801c135c AB |
1203 | magic, UBI_EC_HDR_MAGIC); |
1204 | goto fail; | |
1205 | } | |
1206 | ||
1207 | err = validate_ec_hdr(ubi, ec_hdr); | |
1208 | if (err) { | |
32608703 | 1209 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
801c135c AB |
1210 | goto fail; |
1211 | } | |
1212 | ||
1213 | return 0; | |
1214 | ||
1215 | fail: | |
a904e3f1 | 1216 | ubi_dump_ec_hdr(ec_hdr); |
25886a36 | 1217 | dump_stack(); |
adbf05e3 | 1218 | return -EINVAL; |
801c135c AB |
1219 | } |
1220 | ||
1221 | /** | |
8056eb4a | 1222 | * self_check_peb_ec_hdr - check erase counter header. |
801c135c AB |
1223 | * @ubi: UBI device description object |
1224 | * @pnum: the physical eraseblock number to check | |
1225 | * | |
ec1f97f5 | 1226 | * This function returns zero if the erase counter header is all right and |
adbf05e3 | 1227 | * a negative error code if not or if an error occurred. |
801c135c | 1228 | */ |
8056eb4a | 1229 | static int self_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum) |
801c135c AB |
1230 | { |
1231 | int err; | |
1232 | uint32_t crc, hdr_crc; | |
1233 | struct ubi_ec_hdr *ec_hdr; | |
1234 | ||
64575574 | 1235 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1236 | return 0; |
1237 | ||
33818bbb | 1238 | ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS); |
801c135c AB |
1239 | if (!ec_hdr) |
1240 | return -ENOMEM; | |
1241 | ||
1242 | err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE); | |
d57f4054 | 1243 | if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err)) |
801c135c AB |
1244 | goto exit; |
1245 | ||
1246 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 1247 | hdr_crc = be32_to_cpu(ec_hdr->hdr_crc); |
801c135c | 1248 | if (hdr_crc != crc) { |
32608703 TB |
1249 | ubi_err(ubi, "bad CRC, calculated %#08x, read %#08x", |
1250 | crc, hdr_crc); | |
1251 | ubi_err(ubi, "self-check failed for PEB %d", pnum); | |
a904e3f1 | 1252 | ubi_dump_ec_hdr(ec_hdr); |
25886a36 | 1253 | dump_stack(); |
adbf05e3 | 1254 | err = -EINVAL; |
801c135c AB |
1255 | goto exit; |
1256 | } | |
1257 | ||
8056eb4a | 1258 | err = self_check_ec_hdr(ubi, pnum, ec_hdr); |
801c135c AB |
1259 | |
1260 | exit: | |
1261 | kfree(ec_hdr); | |
1262 | return err; | |
1263 | } | |
1264 | ||
1265 | /** | |
8056eb4a | 1266 | * self_check_vid_hdr - check that a volume identifier header is all right. |
801c135c AB |
1267 | * @ubi: UBI device description object |
1268 | * @pnum: physical eraseblock number the volume identifier header belongs to | |
1269 | * @vid_hdr: the volume identifier header to check | |
1270 | * | |
1271 | * This function returns zero if the volume identifier header is all right, and | |
adbf05e3 | 1272 | * %-EINVAL if not. |
801c135c | 1273 | */ |
8056eb4a AB |
1274 | static int self_check_vid_hdr(const struct ubi_device *ubi, int pnum, |
1275 | const struct ubi_vid_hdr *vid_hdr) | |
801c135c AB |
1276 | { |
1277 | int err; | |
1278 | uint32_t magic; | |
1279 | ||
64575574 | 1280 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1281 | return 0; |
1282 | ||
3261ebd7 | 1283 | magic = be32_to_cpu(vid_hdr->magic); |
801c135c | 1284 | if (magic != UBI_VID_HDR_MAGIC) { |
32608703 | 1285 | ubi_err(ubi, "bad VID header magic %#08x at PEB %d, must be %#08x", |
801c135c AB |
1286 | magic, pnum, UBI_VID_HDR_MAGIC); |
1287 | goto fail; | |
1288 | } | |
1289 | ||
1290 | err = validate_vid_hdr(ubi, vid_hdr); | |
1291 | if (err) { | |
32608703 | 1292 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
801c135c AB |
1293 | goto fail; |
1294 | } | |
1295 | ||
1296 | return err; | |
1297 | ||
1298 | fail: | |
32608703 | 1299 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
a904e3f1 | 1300 | ubi_dump_vid_hdr(vid_hdr); |
25886a36 | 1301 | dump_stack(); |
adbf05e3 | 1302 | return -EINVAL; |
801c135c AB |
1303 | |
1304 | } | |
1305 | ||
1306 | /** | |
8056eb4a | 1307 | * self_check_peb_vid_hdr - check volume identifier header. |
801c135c AB |
1308 | * @ubi: UBI device description object |
1309 | * @pnum: the physical eraseblock number to check | |
1310 | * | |
1311 | * This function returns zero if the volume identifier header is all right, | |
adbf05e3 | 1312 | * and a negative error code if not or if an error occurred. |
801c135c | 1313 | */ |
8056eb4a | 1314 | static int self_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum) |
801c135c AB |
1315 | { |
1316 | int err; | |
1317 | uint32_t crc, hdr_crc; | |
3291b52f | 1318 | struct ubi_vid_io_buf *vidb; |
801c135c AB |
1319 | struct ubi_vid_hdr *vid_hdr; |
1320 | void *p; | |
1321 | ||
64575574 | 1322 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1323 | return 0; |
1324 | ||
3291b52f BB |
1325 | vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS); |
1326 | if (!vidb) | |
801c135c AB |
1327 | return -ENOMEM; |
1328 | ||
3291b52f BB |
1329 | vid_hdr = ubi_get_vid_hdr(vidb); |
1330 | p = vidb->buffer; | |
801c135c AB |
1331 | err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset, |
1332 | ubi->vid_hdr_alsize); | |
d57f4054 | 1333 | if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err)) |
801c135c AB |
1334 | goto exit; |
1335 | ||
2e69d491 | 1336 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); |
3261ebd7 | 1337 | hdr_crc = be32_to_cpu(vid_hdr->hdr_crc); |
801c135c | 1338 | if (hdr_crc != crc) { |
32608703 | 1339 | ubi_err(ubi, "bad VID header CRC at PEB %d, calculated %#08x, read %#08x", |
049333ce | 1340 | pnum, crc, hdr_crc); |
32608703 | 1341 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
a904e3f1 | 1342 | ubi_dump_vid_hdr(vid_hdr); |
25886a36 | 1343 | dump_stack(); |
adbf05e3 | 1344 | err = -EINVAL; |
801c135c AB |
1345 | goto exit; |
1346 | } | |
1347 | ||
8056eb4a | 1348 | err = self_check_vid_hdr(ubi, pnum, vid_hdr); |
801c135c AB |
1349 | |
1350 | exit: | |
3291b52f | 1351 | ubi_free_vid_buf(vidb); |
801c135c AB |
1352 | return err; |
1353 | } | |
1354 | ||
6e9065d7 | 1355 | /** |
97d6104b | 1356 | * self_check_write - make sure write succeeded. |
6e9065d7 AB |
1357 | * @ubi: UBI device description object |
1358 | * @buf: buffer with data which were written | |
1359 | * @pnum: physical eraseblock number the data were written to | |
1360 | * @offset: offset within the physical eraseblock the data were written to | |
1361 | * @len: how many bytes were written | |
1362 | * | |
1363 | * This functions reads data which were recently written and compares it with | |
1364 | * the original data buffer - the data have to match. Returns zero if the data | |
1365 | * match and a negative error code if not or in case of failure. | |
1366 | */ | |
97d6104b AB |
1367 | static int self_check_write(struct ubi_device *ubi, const void *buf, int pnum, |
1368 | int offset, int len) | |
6e9065d7 AB |
1369 | { |
1370 | int err, i; | |
7950d023 | 1371 | size_t read; |
a7586743 | 1372 | void *buf1; |
7950d023 | 1373 | loff_t addr = (loff_t)pnum * ubi->peb_size + offset; |
6e9065d7 | 1374 | |
64575574 | 1375 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1376 | return 0; |
1377 | ||
88dca4ca | 1378 | buf1 = __vmalloc(len, GFP_NOFS); |
a7586743 | 1379 | if (!buf1) { |
32608703 | 1380 | ubi_err(ubi, "cannot allocate memory to check writes"); |
a7586743 AB |
1381 | return 0; |
1382 | } | |
1383 | ||
329ad399 | 1384 | err = mtd_read(ubi->mtd, addr, len, &read, buf1); |
d57f4054 | 1385 | if (err && !mtd_is_bitflip(err)) |
a7586743 | 1386 | goto out_free; |
6e9065d7 AB |
1387 | |
1388 | for (i = 0; i < len; i++) { | |
1389 | uint8_t c = ((uint8_t *)buf)[i]; | |
a7586743 | 1390 | uint8_t c1 = ((uint8_t *)buf1)[i]; |
6e9065d7 AB |
1391 | int dump_len; |
1392 | ||
1393 | if (c == c1) | |
1394 | continue; | |
1395 | ||
32608703 | 1396 | ubi_err(ubi, "self-check failed for PEB %d:%d, len %d", |
6e9065d7 | 1397 | pnum, offset, len); |
32608703 | 1398 | ubi_msg(ubi, "data differ at position %d", i); |
6e9065d7 | 1399 | dump_len = max_t(int, 128, len - i); |
32608703 | 1400 | ubi_msg(ubi, "hex dump of the original buffer from %d to %d", |
6e9065d7 AB |
1401 | i, i + dump_len); |
1402 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, | |
1403 | buf + i, dump_len, 1); | |
32608703 | 1404 | ubi_msg(ubi, "hex dump of the read buffer from %d to %d", |
6e9065d7 AB |
1405 | i, i + dump_len); |
1406 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, | |
a7586743 | 1407 | buf1 + i, dump_len, 1); |
25886a36 | 1408 | dump_stack(); |
6e9065d7 | 1409 | err = -EINVAL; |
a7586743 | 1410 | goto out_free; |
6e9065d7 | 1411 | } |
6e9065d7 | 1412 | |
a7586743 | 1413 | vfree(buf1); |
6e9065d7 AB |
1414 | return 0; |
1415 | ||
a7586743 AB |
1416 | out_free: |
1417 | vfree(buf1); | |
6e9065d7 AB |
1418 | return err; |
1419 | } | |
1420 | ||
801c135c | 1421 | /** |
97d6104b | 1422 | * ubi_self_check_all_ff - check that a region of flash is empty. |
801c135c AB |
1423 | * @ubi: UBI device description object |
1424 | * @pnum: the physical eraseblock number to check | |
1425 | * @offset: the starting offset within the physical eraseblock to check | |
1426 | * @len: the length of the region to check | |
1427 | * | |
1428 | * This function returns zero if only 0xFF bytes are present at offset | |
adbf05e3 AB |
1429 | * @offset of the physical eraseblock @pnum, and a negative error code if not |
1430 | * or if an error occurred. | |
801c135c | 1431 | */ |
97d6104b | 1432 | int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len) |
801c135c AB |
1433 | { |
1434 | size_t read; | |
1435 | int err; | |
332873d6 | 1436 | void *buf; |
801c135c AB |
1437 | loff_t addr = (loff_t)pnum * ubi->peb_size + offset; |
1438 | ||
64575574 | 1439 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1440 | return 0; |
1441 | ||
88dca4ca | 1442 | buf = __vmalloc(len, GFP_NOFS); |
332873d6 | 1443 | if (!buf) { |
32608703 | 1444 | ubi_err(ubi, "cannot allocate memory to check for 0xFFs"); |
332873d6 AB |
1445 | return 0; |
1446 | } | |
1447 | ||
329ad399 | 1448 | err = mtd_read(ubi->mtd, addr, len, &read, buf); |
d57f4054 | 1449 | if (err && !mtd_is_bitflip(err)) { |
32608703 | 1450 | ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes", |
049333ce | 1451 | err, len, pnum, offset, read); |
801c135c AB |
1452 | goto error; |
1453 | } | |
1454 | ||
332873d6 | 1455 | err = ubi_check_pattern(buf, 0xFF, len); |
801c135c | 1456 | if (err == 0) { |
32608703 | 1457 | ubi_err(ubi, "flash region at PEB %d:%d, length %d does not contain all 0xFF bytes", |
049333ce | 1458 | pnum, offset, len); |
801c135c AB |
1459 | goto fail; |
1460 | } | |
1461 | ||
332873d6 | 1462 | vfree(buf); |
801c135c AB |
1463 | return 0; |
1464 | ||
1465 | fail: | |
32608703 | 1466 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
45fc5c81 | 1467 | ubi_msg(ubi, "hex dump of the %d-%d region", offset, offset + len); |
332873d6 | 1468 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); |
adbf05e3 | 1469 | err = -EINVAL; |
801c135c | 1470 | error: |
25886a36 | 1471 | dump_stack(); |
332873d6 | 1472 | vfree(buf); |
801c135c AB |
1473 | return err; |
1474 | } |