1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2006
4 *
5 * Author: Artem Bityutskiy (Битюцкий Артём)
6 */
7
8 #include "ubi.h"
9 #include <linux/debugfs.h>
10 #include <linux/uaccess.h>
11 #include <linux/module.h>
12 #include <linux/seq_file.h>
13
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 */
ubi_dump_flash(struct ubi_device * ubi,int pnum,int offset,int len)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) {
34 ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes",
35 err, len, pnum, offset, read);
36 goto out;
37 }
38
39 ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d",
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
47 /**
48 * ubi_dump_ec_hdr - dump an erase counter header.
49 * @ec_hdr: the erase counter header to dump
50 */
ubi_dump_ec_hdr(const struct ubi_ec_hdr * ec_hdr)51 void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)
52 {
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");
62 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
63 ec_hdr, UBI_EC_HDR_SIZE, 1);
64 }
65
66 /**
67 * ubi_dump_vid_hdr - dump a volume identifier header.
68 * @vid_hdr: the volume identifier header to dump
69 */
ubi_dump_vid_hdr(const struct ubi_vid_hdr * vid_hdr)70 void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr)
71 {
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",
84 (unsigned long long)be64_to_cpu(vid_hdr->sqnum));
85 pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc));
86 pr_err("Volume identifier header hexdump:\n");
87 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
88 vid_hdr, UBI_VID_HDR_SIZE, 1);
89 }
90
91 /**
92 * ubi_dump_vol_info - dump volume information.
93 * @vol: UBI volume description object
94 */
ubi_dump_vol_info(const struct ubi_volume * vol)95 void ubi_dump_vol_info(const struct ubi_volume *vol)
96 {
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);
110 pr_err("\tskip_check %d\n", vol->skip_check);
111
112 if (vol->name_len <= UBI_VOL_NAME_MAX &&
113 strnlen(vol->name, vol->name_len + 1) == vol->name_len) {
114 pr_err("\tname %s\n", vol->name);
115 } else {
116 pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
117 vol->name[0], vol->name[1], vol->name[2],
118 vol->name[3], vol->name[4]);
119 }
120 }
121
122 /**
123 * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object.
124 * @r: the object to dump
125 * @idx: volume table index
126 */
ubi_dump_vtbl_record(const struct ubi_vtbl_record * r,int idx)127 void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)
128 {
129 int name_len = be16_to_cpu(r->name_len);
130
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);
138
139 if (r->name[0] == '\0') {
140 pr_err("\tname NULL\n");
141 return;
142 }
143
144 if (name_len <= UBI_VOL_NAME_MAX &&
145 strnlen(&r->name[0], name_len + 1) == name_len) {
146 pr_err("\tname %s\n", &r->name[0]);
147 } else {
148 pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
149 r->name[0], r->name[1], r->name[2], r->name[3],
150 r->name[4]);
151 }
152 pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc));
153 }
154
155 /**
156 * ubi_dump_av - dump a &struct ubi_ainf_volume object.
157 * @av: the object to dump
158 */
ubi_dump_av(const struct ubi_ainf_volume * av)159 void ubi_dump_av(const struct ubi_ainf_volume *av)
160 {
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);
170 }
171
172 /**
173 * ubi_dump_aeb - dump a &struct ubi_ainf_peb object.
174 * @aeb: the object to dump
175 * @type: object type: 0 - not corrupted, 1 - corrupted
176 */
ubi_dump_aeb(const struct ubi_ainf_peb * aeb,int type)177 void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type)
178 {
179 pr_err("eraseblock attaching information dump:\n");
180 pr_err("\tec %d\n", aeb->ec);
181 pr_err("\tpnum %d\n", aeb->pnum);
182 if (type == 0) {
183 pr_err("\tlnum %d\n", aeb->lnum);
184 pr_err("\tscrub %d\n", aeb->scrub);
185 pr_err("\tsqnum %llu\n", aeb->sqnum);
186 }
187 }
188
189 /**
190 * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object.
191 * @req: the object to dump
192 */
ubi_dump_mkvol_req(const struct ubi_mkvol_req * req)193 void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req)
194 {
195 char nm[17];
196
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);
203
204 memcpy(nm, req->name, 16);
205 nm[16] = 0;
206 pr_err("\t1st 16 characters of name: %s\n", nm);
207 }
208
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 */
ubi_debugfs_init(void)221 int ubi_debugfs_init(void)
222 {
223 if (!IS_ENABLED(CONFIG_DEBUG_FS))
224 return 0;
225
226 dfs_rootdir = debugfs_create_dir("ubi", NULL);
227 if (IS_ERR_OR_NULL(dfs_rootdir)) {
228 int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV;
229
230 pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n",
231 err);
232 return err;
233 }
234
235 return 0;
236 }
237
238 /**
239 * ubi_debugfs_exit - remove UBI debugfs directory.
240 */
ubi_debugfs_exit(void)241 void ubi_debugfs_exit(void)
242 {
243 if (IS_ENABLED(CONFIG_DEBUG_FS))
244 debugfs_remove(dfs_rootdir);
245 }
246
247 /* Read an UBI debugfs file */
dfs_file_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)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;
255 char buf[8];
256 int val;
257
258 ubi = ubi_get_device(ubi_num);
259 if (!ubi)
260 return -ENODEV;
261 d = &ubi->dbg;
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;
267 else if (dent == d->dfs_chk_fastmap)
268 val = d->chk_fastmap;
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;
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 }
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 */
dfs_file_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)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;
319 char buf[8] = {0};
320 int val;
321
322 ubi = ubi_get_device(ubi_num);
323 if (!ubi)
324 return -ENODEV;
325 d = &ubi->dbg;
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
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;
344 else
345 d->emulate_power_cut = val;
346 goto out;
347 }
348
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;
362 else if (dent == d->dfs_chk_fastmap)
363 d->chk_fastmap = val;
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;
370 else
371 count = -EINVAL;
372
373 out:
374 ubi_put_device(ubi);
375 return count;
376 }
377
378 /* File operations for all UBI debugfs files except
379 * detailed_erase_block_info
380 */
381 static const struct file_operations dfs_fops = {
382 .read = dfs_file_read,
383 .write = dfs_file_write,
384 .open = simple_open,
385 .llseek = no_llseek,
386 .owner = THIS_MODULE,
387 };
388
389 /* As long as the position is less then that total number of erase blocks,
390 * we still have more to print.
391 */
eraseblk_count_seq_start(struct seq_file * s,loff_t * pos)392 static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos)
393 {
394 struct ubi_device *ubi = s->private;
395
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 */
eraseblk_count_seq_next(struct seq_file * s,void * v,loff_t * pos)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
409 (*pos)++;
410
411 if (*pos < ubi->peb_count)
412 return pos;
413
414 return NULL;
415 }
416
eraseblk_count_seq_stop(struct seq_file * s,void * v)417 static void eraseblk_count_seq_stop(struct seq_file *s, void *v)
418 {
419 }
420
eraseblk_count_seq_show(struct seq_file * s,void * iter)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 */
430 if (*block_number == 0)
431 seq_puts(s, "physical_block_number\terase_count\n");
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
eraseblk_count_open(struct inode * inode,struct file * f)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
eraseblk_count_release(struct inode * inode,struct file * f)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
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 */
ubi_debugfs_init_dev(struct ubi_device * ubi)503 int ubi_debugfs_init_dev(struct ubi_device *ubi)
504 {
505 unsigned long ubi_num = ubi->ubi_num;
506 struct ubi_debug_info *d = &ubi->dbg;
507 int n;
508
509 if (!IS_ENABLED(CONFIG_DEBUG_FS))
510 return 0;
511
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 */
516 return -EINVAL;
517 }
518
519 d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir);
520
521 d->dfs_chk_gen = debugfs_create_file("chk_gen", S_IWUSR, d->dfs_dir,
522 (void *)ubi_num, &dfs_fops);
523
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;
562 }
563
564 /**
565 * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi
566 * @ubi: UBI device description object
567 */
ubi_debugfs_exit_dev(struct ubi_device * ubi)568 void ubi_debugfs_exit_dev(struct ubi_device *ubi)
569 {
570 if (IS_ENABLED(CONFIG_DEBUG_FS))
571 debugfs_remove_recursive(ubi->dbg.dfs_dir);
572 }
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 */
ubi_dbg_power_cut(struct ubi_device * ubi,int caller)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 }
606
