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
111 if (vol->name_len <= UBI_VOL_NAME_MAX &&
112 strnlen(vol->name, vol->name_len + 1) == vol->name_len) {
113 pr_err("\tname %s\n", vol->name);
114 } else {
115 pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
116 vol->name[0], vol->name[1], vol->name[2],
117 vol->name[3], vol->name[4]);
118 }
119 }
120
121 /**
122 * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object.
123 * @r: the object to dump
124 * @idx: volume table index
125 */
ubi_dump_vtbl_record(const struct ubi_vtbl_record * r,int idx)126 void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)
127 {
128 int name_len = be16_to_cpu(r->name_len);
129
130 pr_err("Volume table record %d dump:\n", idx);
131 pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs));
132 pr_err("\talignment %d\n", be32_to_cpu(r->alignment));
133 pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad));
134 pr_err("\tvol_type %d\n", (int)r->vol_type);
135 pr_err("\tupd_marker %d\n", (int)r->upd_marker);
136 pr_err("\tname_len %d\n", name_len);
137
138 if (r->name[0] == '\0') {
139 pr_err("\tname NULL\n");
140 return;
141 }
142
143 if (name_len <= UBI_VOL_NAME_MAX &&
144 strnlen(&r->name[0], name_len + 1) == name_len) {
145 pr_err("\tname %s\n", &r->name[0]);
146 } else {
147 pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
148 r->name[0], r->name[1], r->name[2], r->name[3],
149 r->name[4]);
150 }
151 pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc));
152 }
153
154 /**
155 * ubi_dump_av - dump a &struct ubi_ainf_volume object.
156 * @av: the object to dump
157 */
ubi_dump_av(const struct ubi_ainf_volume * av)158 void ubi_dump_av(const struct ubi_ainf_volume *av)
159 {
160 pr_err("Volume attaching information dump:\n");
161 pr_err("\tvol_id %d\n", av->vol_id);
162 pr_err("\thighest_lnum %d\n", av->highest_lnum);
163 pr_err("\tleb_count %d\n", av->leb_count);
164 pr_err("\tcompat %d\n", av->compat);
165 pr_err("\tvol_type %d\n", av->vol_type);
166 pr_err("\tused_ebs %d\n", av->used_ebs);
167 pr_err("\tlast_data_size %d\n", av->last_data_size);
168 pr_err("\tdata_pad %d\n", av->data_pad);
169 }
170
171 /**
172 * ubi_dump_aeb - dump a &struct ubi_ainf_peb object.
173 * @aeb: the object to dump
174 * @type: object type: 0 - not corrupted, 1 - corrupted
175 */
ubi_dump_aeb(const struct ubi_ainf_peb * aeb,int type)176 void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type)
177 {
178 pr_err("eraseblock attaching information dump:\n");
179 pr_err("\tec %d\n", aeb->ec);
180 pr_err("\tpnum %d\n", aeb->pnum);
181 if (type == 0) {
182 pr_err("\tlnum %d\n", aeb->lnum);
183 pr_err("\tscrub %d\n", aeb->scrub);
184 pr_err("\tsqnum %llu\n", aeb->sqnum);
185 }
186 }
187
188 /**
189 * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object.
190 * @req: the object to dump
191 */
ubi_dump_mkvol_req(const struct ubi_mkvol_req * req)192 void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req)
193 {
194 char nm[17];
195
196 pr_err("Volume creation request dump:\n");
197 pr_err("\tvol_id %d\n", req->vol_id);
198 pr_err("\talignment %d\n", req->alignment);
199 pr_err("\tbytes %lld\n", (long long)req->bytes);
200 pr_err("\tvol_type %d\n", req->vol_type);
201 pr_err("\tname_len %d\n", req->name_len);
202
203 memcpy(nm, req->name, 16);
204 nm[16] = 0;
205 pr_err("\t1st 16 characters of name: %s\n", nm);
206 }
207
208 /*
209 * Root directory for UBI stuff in debugfs. Contains sub-directories which
210 * contain the stuff specific to particular UBI devices.
211 */
212 static struct dentry *dfs_rootdir;
213
214 /**
215 * ubi_debugfs_init - create UBI debugfs directory.
216 *
217 * Create UBI debugfs directory. Returns zero in case of success and a negative
218 * error code in case of failure.
219 */
ubi_debugfs_init(void)220 int ubi_debugfs_init(void)
221 {
222 if (!IS_ENABLED(CONFIG_DEBUG_FS))
223 return 0;
224
225 dfs_rootdir = debugfs_create_dir("ubi", NULL);
226 if (IS_ERR_OR_NULL(dfs_rootdir)) {
227 int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV;
228
229 pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n",
230 err);
231 return err;
232 }
233
234 return 0;
235 }
236
237 /**
238 * ubi_debugfs_exit - remove UBI debugfs directory.
239 */
ubi_debugfs_exit(void)240 void ubi_debugfs_exit(void)
241 {
242 if (IS_ENABLED(CONFIG_DEBUG_FS))
243 debugfs_remove(dfs_rootdir);
244 }
245
246 /* Read an UBI debugfs file */
dfs_file_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)247 static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
248 size_t count, loff_t *ppos)
249 {
250 unsigned long ubi_num = (unsigned long)file->private_data;
251 struct dentry *dent = file->f_path.dentry;
252 struct ubi_device *ubi;
253 struct ubi_debug_info *d;
254 char buf[8];
255 int val;
256
257 ubi = ubi_get_device(ubi_num);
258 if (!ubi)
259 return -ENODEV;
260 d = &ubi->dbg;
261
262 if (dent == d->dfs_chk_gen)
263 val = d->chk_gen;
264 else if (dent == d->dfs_chk_io)
265 val = d->chk_io;
266 else if (dent == d->dfs_chk_fastmap)
267 val = d->chk_fastmap;
268 else if (dent == d->dfs_disable_bgt)
269 val = d->disable_bgt;
270 else if (dent == d->dfs_emulate_bitflips)
271 val = d->emulate_bitflips;
272 else if (dent == d->dfs_emulate_io_failures)
273 val = d->emulate_io_failures;
274 else if (dent == d->dfs_emulate_power_cut) {
275 snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
276 count = simple_read_from_buffer(user_buf, count, ppos,
277 buf, strlen(buf));
278 goto out;
279 } else if (dent == d->dfs_power_cut_min) {
280 snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min);
281 count = simple_read_from_buffer(user_buf, count, ppos,
282 buf, strlen(buf));
283 goto out;
284 } else if (dent == d->dfs_power_cut_max) {
285 snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max);
286 count = simple_read_from_buffer(user_buf, count, ppos,
287 buf, strlen(buf));
288 goto out;
289 }
290 else {
291 count = -EINVAL;
292 goto out;
293 }
294
295 if (val)
296 buf[0] = '1';
297 else
298 buf[0] = '0';
299 buf[1] = '\n';
300 buf[2] = 0x00;
301
302 count = simple_read_from_buffer(user_buf, count, ppos, buf, 2);
303
304 out:
305 ubi_put_device(ubi);
306 return count;
307 }
308
309 /* Write an UBI debugfs file */
dfs_file_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)310 static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
311 size_t count, loff_t *ppos)
312 {
313 unsigned long ubi_num = (unsigned long)file->private_data;
314 struct dentry *dent = file->f_path.dentry;
315 struct ubi_device *ubi;
316 struct ubi_debug_info *d;
317 size_t buf_size;
318 char buf[8] = {0};
319 int val;
320
321 ubi = ubi_get_device(ubi_num);
322 if (!ubi)
323 return -ENODEV;
324 d = &ubi->dbg;
325
326 buf_size = min_t(size_t, count, (sizeof(buf) - 1));
327 if (copy_from_user(buf, user_buf, buf_size)) {
328 count = -EFAULT;
329 goto out;
330 }
331
332 if (dent == d->dfs_power_cut_min) {
333 if (kstrtouint(buf, 0, &d->power_cut_min) != 0)
334 count = -EINVAL;
335 goto out;
336 } else if (dent == d->dfs_power_cut_max) {
337 if (kstrtouint(buf, 0, &d->power_cut_max) != 0)
338 count = -EINVAL;
339 goto out;
340 } else if (dent == d->dfs_emulate_power_cut) {
341 if (kstrtoint(buf, 0, &val) != 0)
342 count = -EINVAL;
343 else
344 d->emulate_power_cut = val;
345 goto out;
346 }
347
348 if (buf[0] == '1')
349 val = 1;
350 else if (buf[0] == '0')
351 val = 0;
352 else {
353 count = -EINVAL;
354 goto out;
355 }
356
357 if (dent == d->dfs_chk_gen)
358 d->chk_gen = val;
359 else if (dent == d->dfs_chk_io)
360 d->chk_io = val;
361 else if (dent == d->dfs_chk_fastmap)
362 d->chk_fastmap = val;
363 else if (dent == d->dfs_disable_bgt)
364 d->disable_bgt = val;
365 else if (dent == d->dfs_emulate_bitflips)
366 d->emulate_bitflips = val;
367 else if (dent == d->dfs_emulate_io_failures)
368 d->emulate_io_failures = val;
369 else
370 count = -EINVAL;
371
372 out:
373 ubi_put_device(ubi);
374 return count;
375 }
376
377 /* File operations for all UBI debugfs files except
378 * detailed_erase_block_info
379 */
380 static const struct file_operations dfs_fops = {
381 .read = dfs_file_read,
382 .write = dfs_file_write,
383 .open = simple_open,
384 .llseek = no_llseek,
385 .owner = THIS_MODULE,
386 };
387
388 /* As long as the position is less then that total number of erase blocks,
389 * we still have more to print.
390 */
eraseblk_count_seq_start(struct seq_file * s,loff_t * pos)391 static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos)
392 {
393 struct ubi_device *ubi = s->private;
394
395 if (*pos < ubi->peb_count)
396 return pos;
397
398 return NULL;
399 }
400
401 /* Since we are using the position as the iterator, we just need to check if we
402 * are done and increment the position.
403 */
eraseblk_count_seq_next(struct seq_file * s,void * v,loff_t * pos)404 static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos)
405 {
406 struct ubi_device *ubi = s->private;
407
408 (*pos)++;
409
410 if (*pos < ubi->peb_count)
411 return pos;
412
413 return NULL;
414 }
415
eraseblk_count_seq_stop(struct seq_file * s,void * v)416 static void eraseblk_count_seq_stop(struct seq_file *s, void *v)
417 {
418 }
419
eraseblk_count_seq_show(struct seq_file * s,void * iter)420 static int eraseblk_count_seq_show(struct seq_file *s, void *iter)
421 {
422 struct ubi_device *ubi = s->private;
423 struct ubi_wl_entry *wl;
424 int *block_number = iter;
425 int erase_count = -1;
426 int err;
427
428 /* If this is the start, print a header */
429 if (*block_number == 0)
430 seq_puts(s, "physical_block_number\terase_count\n");
431
432 err = ubi_io_is_bad(ubi, *block_number);
433 if (err)
434 return err;
435
436 spin_lock(&ubi->wl_lock);
437
438 wl = ubi->lookuptbl[*block_number];
439 if (wl)
440 erase_count = wl->ec;
441
442 spin_unlock(&ubi->wl_lock);
443
444 if (erase_count < 0)
445 return 0;
446
447 seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count);
448
449 return 0;
450 }
451
452 static const struct seq_operations eraseblk_count_seq_ops = {
453 .start = eraseblk_count_seq_start,
454 .next = eraseblk_count_seq_next,
455 .stop = eraseblk_count_seq_stop,
456 .show = eraseblk_count_seq_show
457 };
458
eraseblk_count_open(struct inode * inode,struct file * f)459 static int eraseblk_count_open(struct inode *inode, struct file *f)
460 {
461 struct seq_file *s;
462 int err;
463
464 err = seq_open(f, &eraseblk_count_seq_ops);
465 if (err)
466 return err;
467
468 s = f->private_data;
469 s->private = ubi_get_device((unsigned long)inode->i_private);
470
471 if (!s->private)
472 return -ENODEV;
473 else
474 return 0;
475 }
476
eraseblk_count_release(struct inode * inode,struct file * f)477 static int eraseblk_count_release(struct inode *inode, struct file *f)
478 {
479 struct seq_file *s = f->private_data;
480 struct ubi_device *ubi = s->private;
481
482 ubi_put_device(ubi);
483
484 return seq_release(inode, f);
485 }
486
487 static const struct file_operations eraseblk_count_fops = {
488 .owner = THIS_MODULE,
489 .open = eraseblk_count_open,
490 .read = seq_read,
491 .llseek = seq_lseek,
492 .release = eraseblk_count_release,
493 };
494
495 /**
496 * ubi_debugfs_init_dev - initialize debugfs for an UBI device.
497 * @ubi: UBI device description object
498 *
499 * This function creates all debugfs files for UBI device @ubi. Returns zero in
500 * case of success and a negative error code in case of failure.
501 */
ubi_debugfs_init_dev(struct ubi_device * ubi)502 int ubi_debugfs_init_dev(struct ubi_device *ubi)
503 {
504 int err, n;
505 unsigned long ubi_num = ubi->ubi_num;
506 const char *fname;
507 struct dentry *dent;
508 struct ubi_debug_info *d = &ubi->dbg;
509
510 if (!IS_ENABLED(CONFIG_DEBUG_FS))
511 return 0;
512
513 n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME,
514 ubi->ubi_num);
515 if (n == UBI_DFS_DIR_LEN) {
516 /* The array size is too small */
517 fname = UBI_DFS_DIR_NAME;
518 dent = ERR_PTR(-EINVAL);
519 goto out;
520 }
521
522 fname = d->dfs_dir_name;
523 dent = debugfs_create_dir(fname, dfs_rootdir);
524 if (IS_ERR_OR_NULL(dent))
525 goto out;
526 d->dfs_dir = dent;
527
528 fname = "chk_gen";
529 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
530 &dfs_fops);
531 if (IS_ERR_OR_NULL(dent))
532 goto out_remove;
533 d->dfs_chk_gen = dent;
534
535 fname = "chk_io";
536 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
537 &dfs_fops);
538 if (IS_ERR_OR_NULL(dent))
539 goto out_remove;
540 d->dfs_chk_io = dent;
541
542 fname = "chk_fastmap";
543 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
544 &dfs_fops);
545 if (IS_ERR_OR_NULL(dent))
546 goto out_remove;
547 d->dfs_chk_fastmap = dent;
548
549 fname = "tst_disable_bgt";
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_disable_bgt = dent;
555
556 fname = "tst_emulate_bitflips";
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_emulate_bitflips = dent;
562
563 fname = "tst_emulate_io_failures";
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_emulate_io_failures = dent;
569
570 fname = "tst_emulate_power_cut";
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_emulate_power_cut = dent;
576
577 fname = "tst_emulate_power_cut_min";
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_power_cut_min = dent;
583
584 fname = "tst_emulate_power_cut_max";
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_power_cut_max = dent;
590
591 fname = "detailed_erase_block_info";
592 dent = debugfs_create_file(fname, S_IRUSR, d->dfs_dir, (void *)ubi_num,
593 &eraseblk_count_fops);
594 if (IS_ERR_OR_NULL(dent))
595 goto out_remove;
596
597 return 0;
598
599 out_remove:
600 debugfs_remove_recursive(d->dfs_dir);
601 out:
602 err = dent ? PTR_ERR(dent) : -ENODEV;
603 ubi_err(ubi, "cannot create \"%s\" debugfs file or directory, error %d\n",
604 fname, err);
605 return err;
606 }
607
608 /**
609 * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi
610 * @ubi: UBI device description object
611 */
ubi_debugfs_exit_dev(struct ubi_device * ubi)612 void ubi_debugfs_exit_dev(struct ubi_device *ubi)
613 {
614 if (IS_ENABLED(CONFIG_DEBUG_FS))
615 debugfs_remove_recursive(ubi->dbg.dfs_dir);
616 }
617
618 /**
619 * ubi_dbg_power_cut - emulate a power cut if it is time to do so
620 * @ubi: UBI device description object
621 * @caller: Flags set to indicate from where the function is being called
622 *
623 * Returns non-zero if a power cut was emulated, zero if not.
624 */
ubi_dbg_power_cut(struct ubi_device * ubi,int caller)625 int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
626 {
627 unsigned int range;
628
629 if ((ubi->dbg.emulate_power_cut & caller) == 0)
630 return 0;
631
632 if (ubi->dbg.power_cut_counter == 0) {
633 ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min;
634
635 if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
636 range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
637 ubi->dbg.power_cut_counter += prandom_u32() % range;
638 }
639 return 0;
640 }
641
642 ubi->dbg.power_cut_counter--;
643 if (ubi->dbg.power_cut_counter)
644 return 0;
645
646 ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX");
647 ubi_ro_mode(ubi);
648 return 1;
649 }
650