Commit | Line | Data |
---|---|---|
801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
801c135c | 21 | #include "ubi.h" |
2a734bb8 AB |
22 | #include <linux/debugfs.h> |
23 | #include <linux/uaccess.h> | |
b342efd4 | 24 | #include <linux/module.h> |
7bccd12d | 25 | #include <linux/seq_file.h> |
801c135c | 26 | |
ef7088e7 AB |
27 | |
28 | /** | |
29 | * ubi_dump_flash - dump a region of flash. | |
30 | * @ubi: UBI device description object | |
31 | * @pnum: the physical eraseblock number to dump | |
32 | * @offset: the starting offset within the physical eraseblock to dump | |
33 | * @len: the length of the region to dump | |
34 | */ | |
35 | void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len) | |
36 | { | |
37 | int err; | |
38 | size_t read; | |
39 | void *buf; | |
40 | loff_t addr = (loff_t)pnum * ubi->peb_size + offset; | |
41 | ||
42 | buf = vmalloc(len); | |
43 | if (!buf) | |
44 | return; | |
45 | err = mtd_read(ubi->mtd, addr, len, &read, buf); | |
46 | if (err && err != -EUCLEAN) { | |
32608703 | 47 | ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes", |
049333ce | 48 | err, len, pnum, offset, read); |
ef7088e7 AB |
49 | goto out; |
50 | } | |
51 | ||
32608703 | 52 | ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d", |
ef7088e7 AB |
53 | len, pnum, offset); |
54 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); | |
55 | out: | |
56 | vfree(buf); | |
57 | return; | |
58 | } | |
59 | ||
801c135c | 60 | /** |
a904e3f1 | 61 | * ubi_dump_ec_hdr - dump an erase counter header. |
801c135c AB |
62 | * @ec_hdr: the erase counter header to dump |
63 | */ | |
a904e3f1 | 64 | void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr) |
801c135c | 65 | { |
e28453bb AB |
66 | pr_err("Erase counter header dump:\n"); |
67 | pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic)); | |
68 | pr_err("\tversion %d\n", (int)ec_hdr->version); | |
69 | pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec)); | |
70 | pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset)); | |
71 | pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset)); | |
72 | pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq)); | |
73 | pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc)); | |
74 | pr_err("erase counter header hexdump:\n"); | |
6986646b AB |
75 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
76 | ec_hdr, UBI_EC_HDR_SIZE, 1); | |
801c135c AB |
77 | } |
78 | ||
79 | /** | |
a904e3f1 | 80 | * ubi_dump_vid_hdr - dump a volume identifier header. |
801c135c AB |
81 | * @vid_hdr: the volume identifier header to dump |
82 | */ | |
a904e3f1 | 83 | void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr) |
801c135c | 84 | { |
e28453bb AB |
85 | pr_err("Volume identifier header dump:\n"); |
86 | pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic)); | |
87 | pr_err("\tversion %d\n", (int)vid_hdr->version); | |
88 | pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type); | |
89 | pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag); | |
90 | pr_err("\tcompat %d\n", (int)vid_hdr->compat); | |
91 | pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id)); | |
92 | pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum)); | |
93 | pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size)); | |
94 | pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs)); | |
95 | pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad)); | |
96 | pr_err("\tsqnum %llu\n", | |
3261ebd7 | 97 | (unsigned long long)be64_to_cpu(vid_hdr->sqnum)); |
e28453bb AB |
98 | pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc)); |
99 | pr_err("Volume identifier header hexdump:\n"); | |
c8566350 AB |
100 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
101 | vid_hdr, UBI_VID_HDR_SIZE, 1); | |
801c135c AB |
102 | } |
103 | ||
104 | /** | |
766381f0 | 105 | * ubi_dump_vol_info - dump volume information. |
801c135c AB |
106 | * @vol: UBI volume description object |
107 | */ | |
766381f0 | 108 | void ubi_dump_vol_info(const struct ubi_volume *vol) |
801c135c | 109 | { |
e28453bb AB |
110 | pr_err("Volume information dump:\n"); |
111 | pr_err("\tvol_id %d\n", vol->vol_id); | |
112 | pr_err("\treserved_pebs %d\n", vol->reserved_pebs); | |
113 | pr_err("\talignment %d\n", vol->alignment); | |
114 | pr_err("\tdata_pad %d\n", vol->data_pad); | |
115 | pr_err("\tvol_type %d\n", vol->vol_type); | |
116 | pr_err("\tname_len %d\n", vol->name_len); | |
117 | pr_err("\tusable_leb_size %d\n", vol->usable_leb_size); | |
118 | pr_err("\tused_ebs %d\n", vol->used_ebs); | |
119 | pr_err("\tused_bytes %lld\n", vol->used_bytes); | |
120 | pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes); | |
121 | pr_err("\tcorrupted %d\n", vol->corrupted); | |
122 | pr_err("\tupd_marker %d\n", vol->upd_marker); | |
801c135c AB |
123 | |
124 | if (vol->name_len <= UBI_VOL_NAME_MAX && | |
125 | strnlen(vol->name, vol->name_len + 1) == vol->name_len) { | |
e28453bb | 126 | pr_err("\tname %s\n", vol->name); |
801c135c | 127 | } else { |
e28453bb | 128 | pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", |
c8566350 AB |
129 | vol->name[0], vol->name[1], vol->name[2], |
130 | vol->name[3], vol->name[4]); | |
801c135c AB |
131 | } |
132 | } | |
133 | ||
134 | /** | |
1f021e1d | 135 | * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object. |
801c135c AB |
136 | * @r: the object to dump |
137 | * @idx: volume table index | |
138 | */ | |
1f021e1d | 139 | void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx) |
801c135c | 140 | { |
3261ebd7 | 141 | int name_len = be16_to_cpu(r->name_len); |
801c135c | 142 | |
e28453bb AB |
143 | pr_err("Volume table record %d dump:\n", idx); |
144 | pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs)); | |
145 | pr_err("\talignment %d\n", be32_to_cpu(r->alignment)); | |
146 | pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad)); | |
147 | pr_err("\tvol_type %d\n", (int)r->vol_type); | |
148 | pr_err("\tupd_marker %d\n", (int)r->upd_marker); | |
149 | pr_err("\tname_len %d\n", name_len); | |
801c135c AB |
150 | |
151 | if (r->name[0] == '\0') { | |
e28453bb | 152 | pr_err("\tname NULL\n"); |
801c135c AB |
153 | return; |
154 | } | |
155 | ||
156 | if (name_len <= UBI_VOL_NAME_MAX && | |
157 | strnlen(&r->name[0], name_len + 1) == name_len) { | |
e28453bb | 158 | pr_err("\tname %s\n", &r->name[0]); |
801c135c | 159 | } else { |
e28453bb | 160 | pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", |
801c135c AB |
161 | r->name[0], r->name[1], r->name[2], r->name[3], |
162 | r->name[4]); | |
163 | } | |
e28453bb | 164 | pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc)); |
801c135c AB |
165 | } |
166 | ||
167 | /** | |
517af48c AB |
168 | * ubi_dump_av - dump a &struct ubi_ainf_volume object. |
169 | * @av: the object to dump | |
801c135c | 170 | */ |
517af48c | 171 | void ubi_dump_av(const struct ubi_ainf_volume *av) |
801c135c | 172 | { |
e28453bb AB |
173 | pr_err("Volume attaching information dump:\n"); |
174 | pr_err("\tvol_id %d\n", av->vol_id); | |
175 | pr_err("\thighest_lnum %d\n", av->highest_lnum); | |
176 | pr_err("\tleb_count %d\n", av->leb_count); | |
177 | pr_err("\tcompat %d\n", av->compat); | |
178 | pr_err("\tvol_type %d\n", av->vol_type); | |
179 | pr_err("\tused_ebs %d\n", av->used_ebs); | |
180 | pr_err("\tlast_data_size %d\n", av->last_data_size); | |
181 | pr_err("\tdata_pad %d\n", av->data_pad); | |
801c135c AB |
182 | } |
183 | ||
184 | /** | |
2c5ec5ce AB |
185 | * ubi_dump_aeb - dump a &struct ubi_ainf_peb object. |
186 | * @aeb: the object to dump | |
801c135c AB |
187 | * @type: object type: 0 - not corrupted, 1 - corrupted |
188 | */ | |
2c5ec5ce | 189 | void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type) |
801c135c | 190 | { |
e28453bb AB |
191 | pr_err("eraseblock attaching information dump:\n"); |
192 | pr_err("\tec %d\n", aeb->ec); | |
193 | pr_err("\tpnum %d\n", aeb->pnum); | |
801c135c | 194 | if (type == 0) { |
e28453bb AB |
195 | pr_err("\tlnum %d\n", aeb->lnum); |
196 | pr_err("\tscrub %d\n", aeb->scrub); | |
197 | pr_err("\tsqnum %llu\n", aeb->sqnum); | |
801c135c AB |
198 | } |
199 | } | |
200 | ||
201 | /** | |
718c00bb | 202 | * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object. |
801c135c AB |
203 | * @req: the object to dump |
204 | */ | |
718c00bb | 205 | void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req) |
801c135c AB |
206 | { |
207 | char nm[17]; | |
208 | ||
e28453bb AB |
209 | pr_err("Volume creation request dump:\n"); |
210 | pr_err("\tvol_id %d\n", req->vol_id); | |
211 | pr_err("\talignment %d\n", req->alignment); | |
212 | pr_err("\tbytes %lld\n", (long long)req->bytes); | |
213 | pr_err("\tvol_type %d\n", req->vol_type); | |
214 | pr_err("\tname_len %d\n", req->name_len); | |
801c135c AB |
215 | |
216 | memcpy(nm, req->name, 16); | |
217 | nm[16] = 0; | |
e28453bb | 218 | pr_err("\t1st 16 characters of name: %s\n", nm); |
801c135c AB |
219 | } |
220 | ||
2a734bb8 AB |
221 | /* |
222 | * Root directory for UBI stuff in debugfs. Contains sub-directories which | |
223 | * contain the stuff specific to particular UBI devices. | |
224 | */ | |
225 | static struct dentry *dfs_rootdir; | |
226 | ||
227 | /** | |
228 | * ubi_debugfs_init - create UBI debugfs directory. | |
229 | * | |
230 | * Create UBI debugfs directory. Returns zero in case of success and a negative | |
231 | * error code in case of failure. | |
232 | */ | |
233 | int ubi_debugfs_init(void) | |
234 | { | |
903e0e4e | 235 | if (!IS_ENABLED(CONFIG_DEBUG_FS)) |
e9b4cf20 AB |
236 | return 0; |
237 | ||
2a734bb8 AB |
238 | dfs_rootdir = debugfs_create_dir("ubi", NULL); |
239 | if (IS_ERR_OR_NULL(dfs_rootdir)) { | |
97cb69dd | 240 | int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV; |
2a734bb8 | 241 | |
32608703 TB |
242 | pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n", |
243 | err); | |
2a734bb8 AB |
244 | return err; |
245 | } | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | /** | |
251 | * ubi_debugfs_exit - remove UBI debugfs directory. | |
252 | */ | |
253 | void ubi_debugfs_exit(void) | |
254 | { | |
903e0e4e | 255 | if (IS_ENABLED(CONFIG_DEBUG_FS)) |
e9b4cf20 | 256 | debugfs_remove(dfs_rootdir); |
2a734bb8 AB |
257 | } |
258 | ||
259 | /* Read an UBI debugfs file */ | |
260 | static ssize_t dfs_file_read(struct file *file, char __user *user_buf, | |
261 | size_t count, loff_t *ppos) | |
262 | { | |
263 | unsigned long ubi_num = (unsigned long)file->private_data; | |
264 | struct dentry *dent = file->f_path.dentry; | |
265 | struct ubi_device *ubi; | |
266 | struct ubi_debug_info *d; | |
50269067 | 267 | char buf[8]; |
2a734bb8 AB |
268 | int val; |
269 | ||
270 | ubi = ubi_get_device(ubi_num); | |
271 | if (!ubi) | |
272 | return -ENODEV; | |
eab73772 | 273 | d = &ubi->dbg; |
2a734bb8 AB |
274 | |
275 | if (dent == d->dfs_chk_gen) | |
276 | val = d->chk_gen; | |
277 | else if (dent == d->dfs_chk_io) | |
278 | val = d->chk_io; | |
5fa7fa5d RW |
279 | else if (dent == d->dfs_chk_fastmap) |
280 | val = d->chk_fastmap; | |
cd6d8567 AB |
281 | else if (dent == d->dfs_disable_bgt) |
282 | val = d->disable_bgt; | |
283 | else if (dent == d->dfs_emulate_bitflips) | |
284 | val = d->emulate_bitflips; | |
285 | else if (dent == d->dfs_emulate_io_failures) | |
286 | val = d->emulate_io_failures; | |
50269067 | 287 | else if (dent == d->dfs_emulate_power_cut) { |
288 | snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut); | |
289 | count = simple_read_from_buffer(user_buf, count, ppos, | |
290 | buf, strlen(buf)); | |
291 | goto out; | |
292 | } else if (dent == d->dfs_power_cut_min) { | |
293 | snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min); | |
294 | count = simple_read_from_buffer(user_buf, count, ppos, | |
295 | buf, strlen(buf)); | |
296 | goto out; | |
297 | } else if (dent == d->dfs_power_cut_max) { | |
298 | snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max); | |
299 | count = simple_read_from_buffer(user_buf, count, ppos, | |
300 | buf, strlen(buf)); | |
301 | goto out; | |
302 | } | |
2a734bb8 AB |
303 | else { |
304 | count = -EINVAL; | |
305 | goto out; | |
306 | } | |
307 | ||
308 | if (val) | |
309 | buf[0] = '1'; | |
310 | else | |
311 | buf[0] = '0'; | |
312 | buf[1] = '\n'; | |
313 | buf[2] = 0x00; | |
314 | ||
315 | count = simple_read_from_buffer(user_buf, count, ppos, buf, 2); | |
316 | ||
317 | out: | |
318 | ubi_put_device(ubi); | |
319 | return count; | |
320 | } | |
321 | ||
322 | /* Write an UBI debugfs file */ | |
323 | static ssize_t dfs_file_write(struct file *file, const char __user *user_buf, | |
324 | size_t count, loff_t *ppos) | |
325 | { | |
326 | unsigned long ubi_num = (unsigned long)file->private_data; | |
327 | struct dentry *dent = file->f_path.dentry; | |
328 | struct ubi_device *ubi; | |
329 | struct ubi_debug_info *d; | |
330 | size_t buf_size; | |
50269067 | 331 | char buf[8] = {0}; |
2a734bb8 AB |
332 | int val; |
333 | ||
334 | ubi = ubi_get_device(ubi_num); | |
335 | if (!ubi) | |
336 | return -ENODEV; | |
eab73772 | 337 | d = &ubi->dbg; |
2a734bb8 AB |
338 | |
339 | buf_size = min_t(size_t, count, (sizeof(buf) - 1)); | |
340 | if (copy_from_user(buf, user_buf, buf_size)) { | |
341 | count = -EFAULT; | |
342 | goto out; | |
343 | } | |
344 | ||
50269067 | 345 | if (dent == d->dfs_power_cut_min) { |
346 | if (kstrtouint(buf, 0, &d->power_cut_min) != 0) | |
347 | count = -EINVAL; | |
348 | goto out; | |
349 | } else if (dent == d->dfs_power_cut_max) { | |
350 | if (kstrtouint(buf, 0, &d->power_cut_max) != 0) | |
351 | count = -EINVAL; | |
352 | goto out; | |
353 | } else if (dent == d->dfs_emulate_power_cut) { | |
354 | if (kstrtoint(buf, 0, &val) != 0) | |
355 | count = -EINVAL; | |
24663e72 DC |
356 | else |
357 | d->emulate_power_cut = val; | |
50269067 | 358 | goto out; |
359 | } | |
360 | ||
2a734bb8 AB |
361 | if (buf[0] == '1') |
362 | val = 1; | |
363 | else if (buf[0] == '0') | |
364 | val = 0; | |
365 | else { | |
366 | count = -EINVAL; | |
367 | goto out; | |
368 | } | |
369 | ||
370 | if (dent == d->dfs_chk_gen) | |
371 | d->chk_gen = val; | |
372 | else if (dent == d->dfs_chk_io) | |
373 | d->chk_io = val; | |
5fa7fa5d RW |
374 | else if (dent == d->dfs_chk_fastmap) |
375 | d->chk_fastmap = val; | |
cd6d8567 AB |
376 | else if (dent == d->dfs_disable_bgt) |
377 | d->disable_bgt = val; | |
378 | else if (dent == d->dfs_emulate_bitflips) | |
379 | d->emulate_bitflips = val; | |
380 | else if (dent == d->dfs_emulate_io_failures) | |
381 | d->emulate_io_failures = val; | |
2a734bb8 AB |
382 | else |
383 | count = -EINVAL; | |
384 | ||
385 | out: | |
386 | ubi_put_device(ubi); | |
387 | return count; | |
388 | } | |
389 | ||
7bccd12d BS |
390 | /* File operations for all UBI debugfs files except |
391 | * detailed_erase_block_info | |
392 | */ | |
2a734bb8 AB |
393 | static const struct file_operations dfs_fops = { |
394 | .read = dfs_file_read, | |
395 | .write = dfs_file_write, | |
234e3405 | 396 | .open = simple_open, |
2a734bb8 AB |
397 | .llseek = no_llseek, |
398 | .owner = THIS_MODULE, | |
399 | }; | |
400 | ||
7bccd12d BS |
401 | /* As long as the position is less then that total number of erase blocks, |
402 | * we still have more to print. | |
403 | */ | |
404 | static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos) | |
405 | { | |
406 | struct ubi_device *ubi = s->private; | |
407 | ||
408 | if (*pos == 0) | |
409 | return SEQ_START_TOKEN; | |
410 | ||
411 | if (*pos < ubi->peb_count) | |
412 | return pos; | |
413 | ||
414 | return NULL; | |
415 | } | |
416 | ||
417 | /* Since we are using the position as the iterator, we just need to check if we | |
418 | * are done and increment the position. | |
419 | */ | |
420 | static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
421 | { | |
422 | struct ubi_device *ubi = s->private; | |
423 | ||
424 | if (v == SEQ_START_TOKEN) | |
425 | return pos; | |
426 | (*pos)++; | |
427 | ||
428 | if (*pos < ubi->peb_count) | |
429 | return pos; | |
430 | ||
431 | return NULL; | |
432 | } | |
433 | ||
434 | static void eraseblk_count_seq_stop(struct seq_file *s, void *v) | |
435 | { | |
436 | } | |
437 | ||
438 | static int eraseblk_count_seq_show(struct seq_file *s, void *iter) | |
439 | { | |
440 | struct ubi_device *ubi = s->private; | |
441 | struct ubi_wl_entry *wl; | |
442 | int *block_number = iter; | |
443 | int erase_count = -1; | |
444 | int err; | |
445 | ||
446 | /* If this is the start, print a header */ | |
447 | if (iter == SEQ_START_TOKEN) { | |
448 | seq_puts(s, | |
449 | "physical_block_number\terase_count\tblock_status\tread_status\n"); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | err = ubi_io_is_bad(ubi, *block_number); | |
454 | if (err) | |
455 | return err; | |
456 | ||
457 | spin_lock(&ubi->wl_lock); | |
458 | ||
459 | wl = ubi->lookuptbl[*block_number]; | |
460 | if (wl) | |
461 | erase_count = wl->ec; | |
462 | ||
463 | spin_unlock(&ubi->wl_lock); | |
464 | ||
465 | if (erase_count < 0) | |
466 | return 0; | |
467 | ||
468 | seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static const struct seq_operations eraseblk_count_seq_ops = { | |
474 | .start = eraseblk_count_seq_start, | |
475 | .next = eraseblk_count_seq_next, | |
476 | .stop = eraseblk_count_seq_stop, | |
477 | .show = eraseblk_count_seq_show | |
478 | }; | |
479 | ||
480 | static int eraseblk_count_open(struct inode *inode, struct file *f) | |
481 | { | |
482 | struct seq_file *s; | |
483 | int err; | |
484 | ||
485 | err = seq_open(f, &eraseblk_count_seq_ops); | |
486 | if (err) | |
487 | return err; | |
488 | ||
489 | s = f->private_data; | |
490 | s->private = ubi_get_device((unsigned long)inode->i_private); | |
491 | ||
492 | if (!s->private) | |
493 | return -ENODEV; | |
494 | else | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static int eraseblk_count_release(struct inode *inode, struct file *f) | |
499 | { | |
500 | struct seq_file *s = f->private_data; | |
501 | struct ubi_device *ubi = s->private; | |
502 | ||
503 | ubi_put_device(ubi); | |
504 | ||
505 | return seq_release(inode, f); | |
506 | } | |
507 | ||
508 | static const struct file_operations eraseblk_count_fops = { | |
509 | .owner = THIS_MODULE, | |
510 | .open = eraseblk_count_open, | |
511 | .read = seq_read, | |
512 | .llseek = seq_lseek, | |
513 | .release = eraseblk_count_release, | |
514 | }; | |
515 | ||
2a734bb8 AB |
516 | /** |
517 | * ubi_debugfs_init_dev - initialize debugfs for an UBI device. | |
518 | * @ubi: UBI device description object | |
519 | * | |
520 | * This function creates all debugfs files for UBI device @ubi. Returns zero in | |
521 | * case of success and a negative error code in case of failure. | |
522 | */ | |
523 | int ubi_debugfs_init_dev(struct ubi_device *ubi) | |
524 | { | |
525 | int err, n; | |
526 | unsigned long ubi_num = ubi->ubi_num; | |
527 | const char *fname; | |
528 | struct dentry *dent; | |
eab73772 | 529 | struct ubi_debug_info *d = &ubi->dbg; |
2a734bb8 | 530 | |
903e0e4e | 531 | if (!IS_ENABLED(CONFIG_DEBUG_FS)) |
e9b4cf20 AB |
532 | return 0; |
533 | ||
2a734bb8 AB |
534 | n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, |
535 | ubi->ubi_num); | |
536 | if (n == UBI_DFS_DIR_LEN) { | |
537 | /* The array size is too small */ | |
538 | fname = UBI_DFS_DIR_NAME; | |
539 | dent = ERR_PTR(-EINVAL); | |
540 | goto out; | |
541 | } | |
542 | ||
543 | fname = d->dfs_dir_name; | |
544 | dent = debugfs_create_dir(fname, dfs_rootdir); | |
545 | if (IS_ERR_OR_NULL(dent)) | |
546 | goto out; | |
547 | d->dfs_dir = dent; | |
548 | ||
549 | fname = "chk_gen"; | |
550 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
551 | &dfs_fops); | |
552 | if (IS_ERR_OR_NULL(dent)) | |
553 | goto out_remove; | |
554 | d->dfs_chk_gen = dent; | |
555 | ||
556 | fname = "chk_io"; | |
557 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
558 | &dfs_fops); | |
559 | if (IS_ERR_OR_NULL(dent)) | |
560 | goto out_remove; | |
561 | d->dfs_chk_io = dent; | |
562 | ||
5fa7fa5d RW |
563 | fname = "chk_fastmap"; |
564 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
565 | &dfs_fops); | |
566 | if (IS_ERR_OR_NULL(dent)) | |
567 | goto out_remove; | |
568 | d->dfs_chk_fastmap = dent; | |
569 | ||
cd6d8567 AB |
570 | fname = "tst_disable_bgt"; |
571 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
572 | &dfs_fops); | |
573 | if (IS_ERR_OR_NULL(dent)) | |
574 | goto out_remove; | |
575 | d->dfs_disable_bgt = dent; | |
576 | ||
577 | fname = "tst_emulate_bitflips"; | |
578 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
579 | &dfs_fops); | |
580 | if (IS_ERR_OR_NULL(dent)) | |
581 | goto out_remove; | |
582 | d->dfs_emulate_bitflips = dent; | |
583 | ||
584 | fname = "tst_emulate_io_failures"; | |
585 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
586 | &dfs_fops); | |
587 | if (IS_ERR_OR_NULL(dent)) | |
588 | goto out_remove; | |
589 | d->dfs_emulate_io_failures = dent; | |
590 | ||
50269067 | 591 | fname = "tst_emulate_power_cut"; |
592 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
593 | &dfs_fops); | |
594 | if (IS_ERR_OR_NULL(dent)) | |
595 | goto out_remove; | |
596 | d->dfs_emulate_power_cut = dent; | |
597 | ||
598 | fname = "tst_emulate_power_cut_min"; | |
599 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
600 | &dfs_fops); | |
601 | if (IS_ERR_OR_NULL(dent)) | |
602 | goto out_remove; | |
603 | d->dfs_power_cut_min = dent; | |
604 | ||
605 | fname = "tst_emulate_power_cut_max"; | |
606 | dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, | |
607 | &dfs_fops); | |
608 | if (IS_ERR_OR_NULL(dent)) | |
609 | goto out_remove; | |
610 | d->dfs_power_cut_max = dent; | |
611 | ||
7bccd12d BS |
612 | fname = "detailed_erase_block_info"; |
613 | dent = debugfs_create_file(fname, S_IRUSR, d->dfs_dir, (void *)ubi_num, | |
614 | &eraseblk_count_fops); | |
615 | if (IS_ERR_OR_NULL(dent)) | |
616 | goto out_remove; | |
617 | ||
2a734bb8 AB |
618 | return 0; |
619 | ||
620 | out_remove: | |
621 | debugfs_remove_recursive(d->dfs_dir); | |
622 | out: | |
623 | err = dent ? PTR_ERR(dent) : -ENODEV; | |
32608703 | 624 | ubi_err(ubi, "cannot create \"%s\" debugfs file or directory, error %d\n", |
2a734bb8 AB |
625 | fname, err); |
626 | return err; | |
627 | } | |
628 | ||
629 | /** | |
630 | * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi | |
631 | * @ubi: UBI device description object | |
632 | */ | |
633 | void ubi_debugfs_exit_dev(struct ubi_device *ubi) | |
634 | { | |
903e0e4e | 635 | if (IS_ENABLED(CONFIG_DEBUG_FS)) |
eab73772 | 636 | debugfs_remove_recursive(ubi->dbg.dfs_dir); |
2a734bb8 | 637 | } |
50269067 | 638 | |
639 | /** | |
640 | * ubi_dbg_power_cut - emulate a power cut if it is time to do so | |
641 | * @ubi: UBI device description object | |
642 | * @caller: Flags set to indicate from where the function is being called | |
643 | * | |
644 | * Returns non-zero if a power cut was emulated, zero if not. | |
645 | */ | |
646 | int ubi_dbg_power_cut(struct ubi_device *ubi, int caller) | |
647 | { | |
648 | unsigned int range; | |
649 | ||
650 | if ((ubi->dbg.emulate_power_cut & caller) == 0) | |
651 | return 0; | |
652 | ||
653 | if (ubi->dbg.power_cut_counter == 0) { | |
654 | ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min; | |
655 | ||
656 | if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) { | |
657 | range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min; | |
658 | ubi->dbg.power_cut_counter += prandom_u32() % range; | |
659 | } | |
660 | return 0; | |
661 | } | |
662 | ||
663 | ubi->dbg.power_cut_counter--; | |
664 | if (ubi->dbg.power_cut_counter) | |
665 | return 0; | |
666 | ||
667 | ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX"); | |
668 | ubi_ro_mode(ubi); | |
669 | return 1; | |
670 | } |