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Commit | Line | Data |
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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 | * | |
801c135c AB |
5 | * Author: Artem Bityutskiy (Битюцкий Артём) |
6 | */ | |
7 | ||
801c135c | 8 | #include "ubi.h" |
2a734bb8 AB |
9 | #include <linux/debugfs.h> |
10 | #include <linux/uaccess.h> | |
b342efd4 | 11 | #include <linux/module.h> |
7bccd12d | 12 | #include <linux/seq_file.h> |
801c135c | 13 | |
ef7088e7 AB |
14 | |
15 | /** | |
16 | * ubi_dump_flash - dump a region of flash. | |
17 | * @ubi: UBI device description object | |
18 | * @pnum: the physical eraseblock number to dump | |
19 | * @offset: the starting offset within the physical eraseblock to dump | |
20 | * @len: the length of the region to dump | |
21 | */ | |
22 | void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len) | |
23 | { | |
24 | int err; | |
25 | size_t read; | |
26 | void *buf; | |
27 | loff_t addr = (loff_t)pnum * ubi->peb_size + offset; | |
28 | ||
29 | buf = vmalloc(len); | |
30 | if (!buf) | |
31 | return; | |
32 | err = mtd_read(ubi->mtd, addr, len, &read, buf); | |
33 | if (err && err != -EUCLEAN) { | |
32608703 | 34 | ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes", |
049333ce | 35 | err, len, pnum, offset, read); |
ef7088e7 AB |
36 | goto out; |
37 | } | |
38 | ||
32608703 | 39 | ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d", |
ef7088e7 AB |
40 | len, pnum, offset); |
41 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); | |
42 | out: | |
43 | vfree(buf); | |
44 | return; | |
45 | } | |
46 | ||
801c135c | 47 | /** |
a904e3f1 | 48 | * ubi_dump_ec_hdr - dump an erase counter header. |
801c135c AB |
49 | * @ec_hdr: the erase counter header to dump |
50 | */ | |
a904e3f1 | 51 | void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr) |
801c135c | 52 | { |
e28453bb AB |
53 | pr_err("Erase counter header dump:\n"); |
54 | pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic)); | |
55 | pr_err("\tversion %d\n", (int)ec_hdr->version); | |
56 | pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec)); | |
57 | pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset)); | |
58 | pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset)); | |
59 | pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq)); | |
60 | pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc)); | |
61 | pr_err("erase counter header hexdump:\n"); | |
6986646b AB |
62 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
63 | ec_hdr, UBI_EC_HDR_SIZE, 1); | |
801c135c AB |
64 | } |
65 | ||
66 | /** | |
a904e3f1 | 67 | * ubi_dump_vid_hdr - dump a volume identifier header. |
801c135c AB |
68 | * @vid_hdr: the volume identifier header to dump |
69 | */ | |
a904e3f1 | 70 | void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr) |
801c135c | 71 | { |
e28453bb AB |
72 | pr_err("Volume identifier header dump:\n"); |
73 | pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic)); | |
74 | pr_err("\tversion %d\n", (int)vid_hdr->version); | |
75 | pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type); | |
76 | pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag); | |
77 | pr_err("\tcompat %d\n", (int)vid_hdr->compat); | |
78 | pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id)); | |
79 | pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum)); | |
80 | pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size)); | |
81 | pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs)); | |
82 | pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad)); | |
83 | pr_err("\tsqnum %llu\n", | |
3261ebd7 | 84 | (unsigned long long)be64_to_cpu(vid_hdr->sqnum)); |
e28453bb AB |
85 | pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc)); |
86 | pr_err("Volume identifier header hexdump:\n"); | |
c8566350 AB |
87 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
88 | vid_hdr, UBI_VID_HDR_SIZE, 1); | |
801c135c AB |
89 | } |
90 | ||
91 | /** | |
766381f0 | 92 | * ubi_dump_vol_info - dump volume information. |
801c135c AB |
93 | * @vol: UBI volume description object |
94 | */ | |
766381f0 | 95 | void ubi_dump_vol_info(const struct ubi_volume *vol) |
801c135c | 96 | { |
e28453bb AB |
97 | pr_err("Volume information dump:\n"); |
98 | pr_err("\tvol_id %d\n", vol->vol_id); | |
99 | pr_err("\treserved_pebs %d\n", vol->reserved_pebs); | |
100 | pr_err("\talignment %d\n", vol->alignment); | |
101 | pr_err("\tdata_pad %d\n", vol->data_pad); | |
102 | pr_err("\tvol_type %d\n", vol->vol_type); | |
103 | pr_err("\tname_len %d\n", vol->name_len); | |
104 | pr_err("\tusable_leb_size %d\n", vol->usable_leb_size); | |
105 | pr_err("\tused_ebs %d\n", vol->used_ebs); | |
106 | pr_err("\tused_bytes %lld\n", vol->used_bytes); | |
107 | pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes); | |
108 | pr_err("\tcorrupted %d\n", vol->corrupted); | |
109 | pr_err("\tupd_marker %d\n", vol->upd_marker); | |
188945e9 | 110 | pr_err("\tskip_check %d\n", vol->skip_check); |
801c135c AB |
111 | |
112 | if (vol->name_len <= UBI_VOL_NAME_MAX && | |
113 | strnlen(vol->name, vol->name_len + 1) == vol->name_len) { | |
e28453bb | 114 | pr_err("\tname %s\n", vol->name); |
801c135c | 115 | } else { |
e28453bb | 116 | pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", |
c8566350 AB |
117 | vol->name[0], vol->name[1], vol->name[2], |
118 | vol->name[3], vol->name[4]); | |
801c135c AB |
119 | } |
120 | } | |
121 | ||
122 | /** | |
1f021e1d | 123 | * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object. |
801c135c AB |
124 | * @r: the object to dump |
125 | * @idx: volume table index | |
126 | */ | |
1f021e1d | 127 | void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx) |
801c135c | 128 | { |
3261ebd7 | 129 | int name_len = be16_to_cpu(r->name_len); |
801c135c | 130 | |
e28453bb AB |
131 | pr_err("Volume table record %d dump:\n", idx); |
132 | pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs)); | |
133 | pr_err("\talignment %d\n", be32_to_cpu(r->alignment)); | |
134 | pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad)); | |
135 | pr_err("\tvol_type %d\n", (int)r->vol_type); | |
136 | pr_err("\tupd_marker %d\n", (int)r->upd_marker); | |
137 | pr_err("\tname_len %d\n", name_len); | |
801c135c AB |
138 | |
139 | if (r->name[0] == '\0') { | |
e28453bb | 140 | pr_err("\tname NULL\n"); |
801c135c AB |
141 | return; |
142 | } | |
143 | ||
144 | if (name_len <= UBI_VOL_NAME_MAX && | |
145 | strnlen(&r->name[0], name_len + 1) == name_len) { | |
e28453bb | 146 | pr_err("\tname %s\n", &r->name[0]); |
801c135c | 147 | } else { |
e28453bb | 148 | pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", |
801c135c AB |
149 | r->name[0], r->name[1], r->name[2], r->name[3], |
150 | r->name[4]); | |
151 | } | |
e28453bb | 152 | pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc)); |
801c135c AB |
153 | } |
154 | ||
155 | /** | |
517af48c AB |
156 | * ubi_dump_av - dump a &struct ubi_ainf_volume object. |
157 | * @av: the object to dump | |
801c135c | 158 | */ |
517af48c | 159 | void ubi_dump_av(const struct ubi_ainf_volume *av) |
801c135c | 160 | { |
e28453bb AB |
161 | pr_err("Volume attaching information dump:\n"); |
162 | pr_err("\tvol_id %d\n", av->vol_id); | |
163 | pr_err("\thighest_lnum %d\n", av->highest_lnum); | |
164 | pr_err("\tleb_count %d\n", av->leb_count); | |
165 | pr_err("\tcompat %d\n", av->compat); | |
166 | pr_err("\tvol_type %d\n", av->vol_type); | |
167 | pr_err("\tused_ebs %d\n", av->used_ebs); | |
168 | pr_err("\tlast_data_size %d\n", av->last_data_size); | |
169 | pr_err("\tdata_pad %d\n", av->data_pad); | |
801c135c AB |
170 | } |
171 | ||
172 | /** | |
2c5ec5ce AB |
173 | * ubi_dump_aeb - dump a &struct ubi_ainf_peb object. |
174 | * @aeb: the object to dump | |
801c135c AB |
175 | * @type: object type: 0 - not corrupted, 1 - corrupted |
176 | */ | |
2c5ec5ce | 177 | void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type) |
801c135c | 178 | { |
e28453bb AB |
179 | pr_err("eraseblock attaching information dump:\n"); |
180 | pr_err("\tec %d\n", aeb->ec); | |
181 | pr_err("\tpnum %d\n", aeb->pnum); | |
801c135c | 182 | if (type == 0) { |
e28453bb AB |
183 | pr_err("\tlnum %d\n", aeb->lnum); |
184 | pr_err("\tscrub %d\n", aeb->scrub); | |
185 | pr_err("\tsqnum %llu\n", aeb->sqnum); | |
801c135c AB |
186 | } |
187 | } | |
188 | ||
189 | /** | |
718c00bb | 190 | * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object. |
801c135c AB |
191 | * @req: the object to dump |
192 | */ | |
718c00bb | 193 | void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req) |
801c135c AB |
194 | { |
195 | char nm[17]; | |
196 | ||
e28453bb AB |
197 | pr_err("Volume creation request dump:\n"); |
198 | pr_err("\tvol_id %d\n", req->vol_id); | |
199 | pr_err("\talignment %d\n", req->alignment); | |
200 | pr_err("\tbytes %lld\n", (long long)req->bytes); | |
201 | pr_err("\tvol_type %d\n", req->vol_type); | |
202 | pr_err("\tname_len %d\n", req->name_len); | |
801c135c AB |
203 | |
204 | memcpy(nm, req->name, 16); | |
205 | nm[16] = 0; | |
e28453bb | 206 | pr_err("\t1st 16 characters of name: %s\n", nm); |
801c135c AB |
207 | } |
208 | ||
2a734bb8 AB |
209 | /* |
210 | * Root directory for UBI stuff in debugfs. Contains sub-directories which | |
211 | * contain the stuff specific to particular UBI devices. | |
212 | */ | |
213 | static struct dentry *dfs_rootdir; | |
214 | ||
215 | /** | |
216 | * ubi_debugfs_init - create UBI debugfs directory. | |
217 | * | |
218 | * Create UBI debugfs directory. Returns zero in case of success and a negative | |
219 | * error code in case of failure. | |
220 | */ | |
221 | int ubi_debugfs_init(void) | |
222 | { | |
903e0e4e | 223 | if (!IS_ENABLED(CONFIG_DEBUG_FS)) |
e9b4cf20 AB |
224 | return 0; |
225 | ||
2a734bb8 AB |
226 | dfs_rootdir = debugfs_create_dir("ubi", NULL); |
227 | if (IS_ERR_OR_NULL(dfs_rootdir)) { | |
97cb69dd | 228 | int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV; |
2a734bb8 | 229 | |
32608703 TB |
230 | pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n", |
231 | err); | |
2a734bb8 AB |
232 | return err; |
233 | } | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | /** | |
239 | * ubi_debugfs_exit - remove UBI debugfs directory. | |
240 | */ | |
241 | void ubi_debugfs_exit(void) | |
242 | { | |
903e0e4e | 243 | if (IS_ENABLED(CONFIG_DEBUG_FS)) |
e9b4cf20 | 244 | debugfs_remove(dfs_rootdir); |
2a734bb8 AB |
245 | } |
246 | ||
247 | /* Read an UBI debugfs file */ | |
248 | static ssize_t dfs_file_read(struct file *file, char __user *user_buf, | |
249 | size_t count, loff_t *ppos) | |
250 | { | |
251 | unsigned long ubi_num = (unsigned long)file->private_data; | |
252 | struct dentry *dent = file->f_path.dentry; | |
253 | struct ubi_device *ubi; | |
254 | struct ubi_debug_info *d; | |
50269067 | 255 | char buf[8]; |
2a734bb8 AB |
256 | int val; |
257 | ||
258 | ubi = ubi_get_device(ubi_num); | |
259 | if (!ubi) | |
260 | return -ENODEV; | |
eab73772 | 261 | d = &ubi->dbg; |
2a734bb8 AB |
262 | |
263 | if (dent == d->dfs_chk_gen) | |
264 | val = d->chk_gen; | |
265 | else if (dent == d->dfs_chk_io) | |
266 | val = d->chk_io; | |
5fa7fa5d RW |
267 | else if (dent == d->dfs_chk_fastmap) |
268 | val = d->chk_fastmap; | |
cd6d8567 AB |
269 | else if (dent == d->dfs_disable_bgt) |
270 | val = d->disable_bgt; | |
271 | else if (dent == d->dfs_emulate_bitflips) | |
272 | val = d->emulate_bitflips; | |
273 | else if (dent == d->dfs_emulate_io_failures) | |
274 | val = d->emulate_io_failures; | |
50269067 | 275 | else if (dent == d->dfs_emulate_power_cut) { |
276 | snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut); | |
277 | count = simple_read_from_buffer(user_buf, count, ppos, | |
278 | buf, strlen(buf)); | |
279 | goto out; | |
280 | } else if (dent == d->dfs_power_cut_min) { | |
281 | snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min); | |
282 | count = simple_read_from_buffer(user_buf, count, ppos, | |
283 | buf, strlen(buf)); | |
284 | goto out; | |
285 | } else if (dent == d->dfs_power_cut_max) { | |
286 | snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max); | |
287 | count = simple_read_from_buffer(user_buf, count, ppos, | |
288 | buf, strlen(buf)); | |
289 | goto out; | |
290 | } | |
2a734bb8 AB |
291 | else { |
292 | count = -EINVAL; | |
293 | goto out; | |
294 | } | |
295 | ||
296 | if (val) | |
297 | buf[0] = '1'; | |
298 | else | |
299 | buf[0] = '0'; | |
300 | buf[1] = '\n'; | |
301 | buf[2] = 0x00; | |
302 | ||
303 | count = simple_read_from_buffer(user_buf, count, ppos, buf, 2); | |
304 | ||
305 | out: | |
306 | ubi_put_device(ubi); | |
307 | return count; | |
308 | } | |
309 | ||
310 | /* Write an UBI debugfs file */ | |
311 | static ssize_t dfs_file_write(struct file *file, const char __user *user_buf, | |
312 | size_t count, loff_t *ppos) | |
313 | { | |
314 | unsigned long ubi_num = (unsigned long)file->private_data; | |
315 | struct dentry *dent = file->f_path.dentry; | |
316 | struct ubi_device *ubi; | |
317 | struct ubi_debug_info *d; | |
318 | size_t buf_size; | |
50269067 | 319 | char buf[8] = {0}; |
2a734bb8 AB |
320 | int val; |
321 | ||
322 | ubi = ubi_get_device(ubi_num); | |
323 | if (!ubi) | |
324 | return -ENODEV; | |
eab73772 | 325 | d = &ubi->dbg; |
2a734bb8 AB |
326 | |
327 | buf_size = min_t(size_t, count, (sizeof(buf) - 1)); | |
328 | if (copy_from_user(buf, user_buf, buf_size)) { | |
329 | count = -EFAULT; | |
330 | goto out; | |
331 | } | |
332 | ||
50269067 | 333 | if (dent == d->dfs_power_cut_min) { |
334 | if (kstrtouint(buf, 0, &d->power_cut_min) != 0) | |
335 | count = -EINVAL; | |
336 | goto out; | |
337 | } else if (dent == d->dfs_power_cut_max) { | |
338 | if (kstrtouint(buf, 0, &d->power_cut_max) != 0) | |
339 | count = -EINVAL; | |
340 | goto out; | |
341 | } else if (dent == d->dfs_emulate_power_cut) { | |
342 | if (kstrtoint(buf, 0, &val) != 0) | |
343 | count = -EINVAL; | |
24663e72 DC |
344 | else |
345 | d->emulate_power_cut = val; | |
50269067 | 346 | goto out; |
347 | } | |
348 | ||
2a734bb8 AB |
349 | if (buf[0] == '1') |
350 | val = 1; | |
351 | else if (buf[0] == '0') | |
352 | val = 0; | |
353 | else { | |
354 | count = -EINVAL; | |
355 | goto out; | |
356 | } | |
357 | ||
358 | if (dent == d->dfs_chk_gen) | |
359 | d->chk_gen = val; | |
360 | else if (dent == d->dfs_chk_io) | |
361 | d->chk_io = val; | |
5fa7fa5d RW |
362 | else if (dent == d->dfs_chk_fastmap) |
363 | d->chk_fastmap = val; | |
cd6d8567 AB |
364 | else if (dent == d->dfs_disable_bgt) |
365 | d->disable_bgt = val; | |
366 | else if (dent == d->dfs_emulate_bitflips) | |
367 | d->emulate_bitflips = val; | |
368 | else if (dent == d->dfs_emulate_io_failures) | |
369 | d->emulate_io_failures = val; | |
2a734bb8 AB |
370 | else |
371 | count = -EINVAL; | |
372 | ||
373 | out: | |
374 | ubi_put_device(ubi); | |
375 | return count; | |
376 | } | |
377 | ||
7bccd12d BS |
378 | /* File operations for all UBI debugfs files except |
379 | * detailed_erase_block_info | |
380 | */ | |
2a734bb8 AB |
381 | static const struct file_operations dfs_fops = { |
382 | .read = dfs_file_read, | |
383 | .write = dfs_file_write, | |
234e3405 | 384 | .open = simple_open, |
2a734bb8 AB |
385 | .llseek = no_llseek, |
386 | .owner = THIS_MODULE, | |
387 | }; | |
388 | ||
7bccd12d BS |
389 | /* As long as the position is less then that total number of erase blocks, |
390 | * we still have more to print. | |
391 | */ | |
392 | static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos) | |
393 | { | |
394 | struct ubi_device *ubi = s->private; | |
395 | ||
7bccd12d BS |
396 | if (*pos < ubi->peb_count) |
397 | return pos; | |
398 | ||
399 | return NULL; | |
400 | } | |
401 | ||
402 | /* Since we are using the position as the iterator, we just need to check if we | |
403 | * are done and increment the position. | |
404 | */ | |
405 | static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
406 | { | |
407 | struct ubi_device *ubi = s->private; | |
408 | ||
7bccd12d BS |
409 | (*pos)++; |
410 | ||
411 | if (*pos < ubi->peb_count) | |
412 | return pos; | |
413 | ||
414 | return NULL; | |
415 | } | |
416 | ||
417 | static void eraseblk_count_seq_stop(struct seq_file *s, void *v) | |
418 | { | |
419 | } | |
420 | ||
421 | static int eraseblk_count_seq_show(struct seq_file *s, void *iter) | |
422 | { | |
423 | struct ubi_device *ubi = s->private; | |
424 | struct ubi_wl_entry *wl; | |
425 | int *block_number = iter; | |
426 | int erase_count = -1; | |
427 | int err; | |
428 | ||
429 | /* If this is the start, print a header */ | |
0e7572cf RW |
430 | if (*block_number == 0) |
431 | seq_puts(s, "physical_block_number\terase_count\n"); | |
7bccd12d BS |
432 | |
433 | err = ubi_io_is_bad(ubi, *block_number); | |
434 | if (err) | |
435 | return err; | |
436 | ||
437 | spin_lock(&ubi->wl_lock); | |
438 | ||
439 | wl = ubi->lookuptbl[*block_number]; | |
440 | if (wl) | |
441 | erase_count = wl->ec; | |
442 | ||
443 | spin_unlock(&ubi->wl_lock); | |
444 | ||
445 | if (erase_count < 0) | |
446 | return 0; | |
447 | ||
448 | seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count); | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | static const struct seq_operations eraseblk_count_seq_ops = { | |
454 | .start = eraseblk_count_seq_start, | |
455 | .next = eraseblk_count_seq_next, | |
456 | .stop = eraseblk_count_seq_stop, | |
457 | .show = eraseblk_count_seq_show | |
458 | }; | |
459 | ||
460 | static int eraseblk_count_open(struct inode *inode, struct file *f) | |
461 | { | |
462 | struct seq_file *s; | |
463 | int err; | |
464 | ||
465 | err = seq_open(f, &eraseblk_count_seq_ops); | |
466 | if (err) | |
467 | return err; | |
468 | ||
469 | s = f->private_data; | |
470 | s->private = ubi_get_device((unsigned long)inode->i_private); | |
471 | ||
472 | if (!s->private) | |
473 | return -ENODEV; | |
474 | else | |
475 | return 0; | |
476 | } | |
477 | ||
478 | static int eraseblk_count_release(struct inode *inode, struct file *f) | |
479 | { | |
480 | struct seq_file *s = f->private_data; | |
481 | struct ubi_device *ubi = s->private; | |
482 | ||
483 | ubi_put_device(ubi); | |
484 | ||
485 | return seq_release(inode, f); | |
486 | } | |
487 | ||
488 | static const struct file_operations eraseblk_count_fops = { | |
489 | .owner = THIS_MODULE, | |
490 | .open = eraseblk_count_open, | |
491 | .read = seq_read, | |
492 | .llseek = seq_lseek, | |
493 | .release = eraseblk_count_release, | |
494 | }; | |
495 | ||
2a734bb8 AB |
496 | /** |
497 | * ubi_debugfs_init_dev - initialize debugfs for an UBI device. | |
498 | * @ubi: UBI device description object | |
499 | * | |
500 | * This function creates all debugfs files for UBI device @ubi. Returns zero in | |
501 | * case of success and a negative error code in case of failure. | |
502 | */ | |
503 | int ubi_debugfs_init_dev(struct ubi_device *ubi) | |
504 | { | |
2a734bb8 | 505 | unsigned long ubi_num = ubi->ubi_num; |
eab73772 | 506 | struct ubi_debug_info *d = &ubi->dbg; |
c2d73ba8 | 507 | int n; |
2a734bb8 | 508 | |
903e0e4e | 509 | if (!IS_ENABLED(CONFIG_DEBUG_FS)) |
e9b4cf20 AB |
510 | return 0; |
511 | ||
2a734bb8 AB |
512 | n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, |
513 | ubi->ubi_num); | |
514 | if (n == UBI_DFS_DIR_LEN) { | |
515 | /* The array size is too small */ | |
c2d73ba8 | 516 | return -EINVAL; |
2a734bb8 AB |
517 | } |
518 | ||
c2d73ba8 | 519 | d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir); |
7bccd12d | 520 | |
c2d73ba8 GKH |
521 | d->dfs_chk_gen = debugfs_create_file("chk_gen", S_IWUSR, d->dfs_dir, |
522 | (void *)ubi_num, &dfs_fops); | |
2a734bb8 | 523 | |
c2d73ba8 GKH |
524 | d->dfs_chk_io = debugfs_create_file("chk_io", S_IWUSR, d->dfs_dir, |
525 | (void *)ubi_num, &dfs_fops); | |
526 | ||
527 | d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", S_IWUSR, | |
528 | d->dfs_dir, (void *)ubi_num, | |
529 | &dfs_fops); | |
530 | ||
531 | d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", S_IWUSR, | |
532 | d->dfs_dir, (void *)ubi_num, | |
533 | &dfs_fops); | |
534 | ||
535 | d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips", | |
536 | S_IWUSR, d->dfs_dir, | |
537 | (void *)ubi_num, | |
538 | &dfs_fops); | |
539 | ||
540 | d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures", | |
541 | S_IWUSR, d->dfs_dir, | |
542 | (void *)ubi_num, | |
543 | &dfs_fops); | |
544 | ||
545 | d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut", | |
546 | S_IWUSR, d->dfs_dir, | |
547 | (void *)ubi_num, | |
548 | &dfs_fops); | |
549 | ||
550 | d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min", | |
551 | S_IWUSR, d->dfs_dir, | |
552 | (void *)ubi_num, &dfs_fops); | |
553 | ||
554 | d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max", | |
555 | S_IWUSR, d->dfs_dir, | |
556 | (void *)ubi_num, &dfs_fops); | |
557 | ||
558 | debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir, | |
559 | (void *)ubi_num, &eraseblk_count_fops); | |
560 | ||
561 | return 0; | |
2a734bb8 AB |
562 | } |
563 | ||
564 | /** | |
565 | * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi | |
566 | * @ubi: UBI device description object | |
567 | */ | |
568 | void ubi_debugfs_exit_dev(struct ubi_device *ubi) | |
569 | { | |
903e0e4e | 570 | if (IS_ENABLED(CONFIG_DEBUG_FS)) |
eab73772 | 571 | debugfs_remove_recursive(ubi->dbg.dfs_dir); |
2a734bb8 | 572 | } |
50269067 | 573 | |
574 | /** | |
575 | * ubi_dbg_power_cut - emulate a power cut if it is time to do so | |
576 | * @ubi: UBI device description object | |
577 | * @caller: Flags set to indicate from where the function is being called | |
578 | * | |
579 | * Returns non-zero if a power cut was emulated, zero if not. | |
580 | */ | |
581 | int ubi_dbg_power_cut(struct ubi_device *ubi, int caller) | |
582 | { | |
583 | unsigned int range; | |
584 | ||
585 | if ((ubi->dbg.emulate_power_cut & caller) == 0) | |
586 | return 0; | |
587 | ||
588 | if (ubi->dbg.power_cut_counter == 0) { | |
589 | ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min; | |
590 | ||
591 | if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) { | |
592 | range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min; | |
593 | ubi->dbg.power_cut_counter += prandom_u32() % range; | |
594 | } | |
595 | return 0; | |
596 | } | |
597 | ||
598 | ubi->dbg.power_cut_counter--; | |
599 | if (ubi->dbg.power_cut_counter) | |
600 | return 0; | |
601 | ||
602 | ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX"); | |
603 | ubi_ro_mode(ubi); | |
604 | return 1; | |
605 | } |