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#include <linux/fault-inject.h>
14
15#ifdef CONFIG_MTD_UBI_FAULT_INJECTION
16static DECLARE_FAULT_ATTR(fault_eccerr_attr);
17static DECLARE_FAULT_ATTR(fault_bitflips_attr);
18static DECLARE_FAULT_ATTR(fault_read_failure_attr);
19static DECLARE_FAULT_ATTR(fault_write_failure_attr);
20static DECLARE_FAULT_ATTR(fault_erase_failure_attr);
21static DECLARE_FAULT_ATTR(fault_power_cut_attr);
22static DECLARE_FAULT_ATTR(fault_io_ff_attr);
23static DECLARE_FAULT_ATTR(fault_io_ff_bitflips_attr);
24static DECLARE_FAULT_ATTR(fault_bad_hdr_attr);
25static DECLARE_FAULT_ATTR(fault_bad_hdr_ebadmsg_attr);
26
27#define FAIL_ACTION(name, fault_attr) \
28bool should_fail_##name(void) \
29{ \
30 return should_fail(&fault_attr, 1); \
31}
32
33FAIL_ACTION(eccerr, fault_eccerr_attr)
34FAIL_ACTION(bitflips, fault_bitflips_attr)
35FAIL_ACTION(read_failure, fault_read_failure_attr)
36FAIL_ACTION(write_failure, fault_write_failure_attr)
37FAIL_ACTION(erase_failure, fault_erase_failure_attr)
38FAIL_ACTION(power_cut, fault_power_cut_attr)
39FAIL_ACTION(io_ff, fault_io_ff_attr)
40FAIL_ACTION(io_ff_bitflips, fault_io_ff_bitflips_attr)
41FAIL_ACTION(bad_hdr, fault_bad_hdr_attr)
42FAIL_ACTION(bad_hdr_ebadmsg, fault_bad_hdr_ebadmsg_attr)
43#endif
44
45/**
46 * ubi_dump_flash - dump a region of flash.
47 * @ubi: UBI device description object
48 * @pnum: the physical eraseblock number to dump
49 * @offset: the starting offset within the physical eraseblock to dump
50 * @len: the length of the region to dump
51 */
52void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len)
53{
54 int err;
55 size_t read;
56 void *buf;
57 loff_t addr = (loff_t)pnum * ubi->peb_size + offset;
58
59 buf = vmalloc(len);
60 if (!buf)
61 return;
62 err = mtd_read(mtd: ubi->mtd, from: addr, len, retlen: &read, buf);
63 if (err && err != -EUCLEAN) {
64 ubi_err(ubi, fmt: "err %d while reading %d bytes from PEB %d:%d, read %zd bytes",
65 err, len, pnum, offset, read);
66 goto out;
67 }
68
69 ubi_msg(ubi, fmt: "dumping %d bytes of data from PEB %d, offset %d",
70 len, pnum, offset);
71 print_hex_dump(KERN_DEBUG, prefix_str: "", prefix_type: DUMP_PREFIX_OFFSET, rowsize: 32, groupsize: 1, buf, len, ascii: 1);
72out:
73 vfree(addr: buf);
74 return;
75}
76
77/**
78 * ubi_dump_ec_hdr - dump an erase counter header.
79 * @ec_hdr: the erase counter header to dump
80 */
81void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)
82{
83 pr_err("Erase counter header dump:\n");
84 pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic));
85 pr_err("\tversion %d\n", (int)ec_hdr->version);
86 pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec));
87 pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset));
88 pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset));
89 pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq));
90 pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc));
91 pr_err("erase counter header hexdump:\n");
92 print_hex_dump(KERN_DEBUG, prefix_str: "", prefix_type: DUMP_PREFIX_OFFSET, rowsize: 32, groupsize: 1,
93 buf: ec_hdr, UBI_EC_HDR_SIZE, ascii: 1);
94}
95
96/**
97 * ubi_dump_vid_hdr - dump a volume identifier header.
98 * @vid_hdr: the volume identifier header to dump
99 */
100void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr)
101{
102 pr_err("Volume identifier header dump:\n");
103 pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic));
104 pr_err("\tversion %d\n", (int)vid_hdr->version);
105 pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type);
106 pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag);
107 pr_err("\tcompat %d\n", (int)vid_hdr->compat);
108 pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id));
109 pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum));
110 pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size));
111 pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs));
112 pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad));
113 pr_err("\tsqnum %llu\n",
114 (unsigned long long)be64_to_cpu(vid_hdr->sqnum));
115 pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc));
116 pr_err("Volume identifier header hexdump:\n");
117 print_hex_dump(KERN_DEBUG, prefix_str: "", prefix_type: DUMP_PREFIX_OFFSET, rowsize: 32, groupsize: 1,
118 buf: vid_hdr, UBI_VID_HDR_SIZE, ascii: 1);
119}
120
121/**
122 * ubi_dump_vol_info - dump volume information.
123 * @vol: UBI volume description object
124 */
125void ubi_dump_vol_info(const struct ubi_volume *vol)
126{
127 pr_err("Volume information dump:\n");
128 pr_err("\tvol_id %d\n", vol->vol_id);
129 pr_err("\treserved_pebs %d\n", vol->reserved_pebs);
130 pr_err("\talignment %d\n", vol->alignment);
131 pr_err("\tdata_pad %d\n", vol->data_pad);
132 pr_err("\tvol_type %d\n", vol->vol_type);
133 pr_err("\tname_len %d\n", vol->name_len);
134 pr_err("\tusable_leb_size %d\n", vol->usable_leb_size);
135 pr_err("\tused_ebs %d\n", vol->used_ebs);
136 pr_err("\tused_bytes %lld\n", vol->used_bytes);
137 pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes);
138 pr_err("\tcorrupted %d\n", vol->corrupted);
139 pr_err("\tupd_marker %d\n", vol->upd_marker);
140 pr_err("\tskip_check %d\n", vol->skip_check);
141
142 if (vol->name_len <= UBI_VOL_NAME_MAX &&
143 strnlen(p: vol->name, maxlen: vol->name_len + 1) == vol->name_len) {
144 pr_err("\tname %s\n", vol->name);
145 } else {
146 pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
147 vol->name[0], vol->name[1], vol->name[2],
148 vol->name[3], vol->name[4]);
149 }
150}
151
152/**
153 * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object.
154 * @r: the object to dump
155 * @idx: volume table index
156 */
157void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)
158{
159 int name_len = be16_to_cpu(r->name_len);
160
161 pr_err("Volume table record %d dump:\n", idx);
162 pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs));
163 pr_err("\talignment %d\n", be32_to_cpu(r->alignment));
164 pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad));
165 pr_err("\tvol_type %d\n", (int)r->vol_type);
166 pr_err("\tupd_marker %d\n", (int)r->upd_marker);
167 pr_err("\tname_len %d\n", name_len);
168
169 if (r->name[0] == '\0') {
170 pr_err("\tname NULL\n");
171 return;
172 }
173
174 if (name_len <= UBI_VOL_NAME_MAX &&
175 strnlen(p: &r->name[0], maxlen: name_len + 1) == name_len) {
176 pr_err("\tname %s\n", &r->name[0]);
177 } else {
178 pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
179 r->name[0], r->name[1], r->name[2], r->name[3],
180 r->name[4]);
181 }
182 pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc));
183}
184
185/**
186 * ubi_dump_av - dump a &struct ubi_ainf_volume object.
187 * @av: the object to dump
188 */
189void ubi_dump_av(const struct ubi_ainf_volume *av)
190{
191 pr_err("Volume attaching information dump:\n");
192 pr_err("\tvol_id %d\n", av->vol_id);
193 pr_err("\thighest_lnum %d\n", av->highest_lnum);
194 pr_err("\tleb_count %d\n", av->leb_count);
195 pr_err("\tcompat %d\n", av->compat);
196 pr_err("\tvol_type %d\n", av->vol_type);
197 pr_err("\tused_ebs %d\n", av->used_ebs);
198 pr_err("\tlast_data_size %d\n", av->last_data_size);
199 pr_err("\tdata_pad %d\n", av->data_pad);
200}
201
202/**
203 * ubi_dump_aeb - dump a &struct ubi_ainf_peb object.
204 * @aeb: the object to dump
205 * @type: object type: 0 - not corrupted, 1 - corrupted
206 */
207void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type)
208{
209 pr_err("eraseblock attaching information dump:\n");
210 pr_err("\tec %d\n", aeb->ec);
211 pr_err("\tpnum %d\n", aeb->pnum);
212 if (type == 0) {
213 pr_err("\tlnum %d\n", aeb->lnum);
214 pr_err("\tscrub %d\n", aeb->scrub);
215 pr_err("\tsqnum %llu\n", aeb->sqnum);
216 }
217}
218
219/**
220 * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object.
221 * @req: the object to dump
222 */
223void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req)
224{
225 char nm[17];
226
227 pr_err("Volume creation request dump:\n");
228 pr_err("\tvol_id %d\n", req->vol_id);
229 pr_err("\talignment %d\n", req->alignment);
230 pr_err("\tbytes %lld\n", (long long)req->bytes);
231 pr_err("\tvol_type %d\n", req->vol_type);
232 pr_err("\tname_len %d\n", req->name_len);
233
234 memcpy(nm, req->name, 16);
235 nm[16] = 0;
236 pr_err("\t1st 16 characters of name: %s\n", nm);
237}
238
239/*
240 * Root directory for UBI stuff in debugfs. Contains sub-directories which
241 * contain the stuff specific to particular UBI devices.
242 */
243static struct dentry *dfs_rootdir;
244
245#ifdef CONFIG_MTD_UBI_FAULT_INJECTION
246static void dfs_create_fault_entry(struct dentry *parent)
247{
248 struct dentry *dir;
249
250 dir = debugfs_create_dir(name: "fault_inject", parent);
251 if (IS_ERR_OR_NULL(ptr: dir)) {
252 int err = dir ? PTR_ERR(ptr: dir) : -ENODEV;
253
254 pr_warn("UBI error: cannot create \"fault_inject\" debugfs directory, error %d\n",
255 err);
256 return;
257 }
258
259 fault_create_debugfs_attr(name: "emulate_eccerr", parent: dir,
260 attr: &fault_eccerr_attr);
261
262 fault_create_debugfs_attr(name: "emulate_read_failure", parent: dir,
263 attr: &fault_read_failure_attr);
264
265 fault_create_debugfs_attr(name: "emulate_bitflips", parent: dir,
266 attr: &fault_bitflips_attr);
267
268 fault_create_debugfs_attr(name: "emulate_write_failure", parent: dir,
269 attr: &fault_write_failure_attr);
270
271 fault_create_debugfs_attr(name: "emulate_erase_failure", parent: dir,
272 attr: &fault_erase_failure_attr);
273
274 fault_create_debugfs_attr(name: "emulate_power_cut", parent: dir,
275 attr: &fault_power_cut_attr);
276
277 fault_create_debugfs_attr(name: "emulate_io_ff", parent: dir,
278 attr: &fault_io_ff_attr);
279
280 fault_create_debugfs_attr(name: "emulate_io_ff_bitflips", parent: dir,
281 attr: &fault_io_ff_bitflips_attr);
282
283 fault_create_debugfs_attr(name: "emulate_bad_hdr", parent: dir,
284 attr: &fault_bad_hdr_attr);
285
286 fault_create_debugfs_attr(name: "emulate_bad_hdr_ebadmsg", parent: dir,
287 attr: &fault_bad_hdr_ebadmsg_attr);
288}
289#endif
290
291/**
292 * ubi_debugfs_init - create UBI debugfs directory.
293 *
294 * Create UBI debugfs directory. Returns zero in case of success and a negative
295 * error code in case of failure.
296 */
297int ubi_debugfs_init(void)
298{
299 if (!IS_ENABLED(CONFIG_DEBUG_FS))
300 return 0;
301
302 dfs_rootdir = debugfs_create_dir(name: "ubi", NULL);
303 if (IS_ERR_OR_NULL(ptr: dfs_rootdir)) {
304 int err = dfs_rootdir ? PTR_ERR(ptr: dfs_rootdir) : -ENODEV;
305
306 pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n",
307 err);
308 return err;
309 }
310
311#ifdef CONFIG_MTD_UBI_FAULT_INJECTION
312 dfs_create_fault_entry(parent: dfs_rootdir);
313#endif
314
315 return 0;
316}
317
318/**
319 * ubi_debugfs_exit - remove UBI debugfs directory.
320 */
321void ubi_debugfs_exit(void)
322{
323 if (IS_ENABLED(CONFIG_DEBUG_FS))
324 debugfs_remove(dentry: dfs_rootdir);
325}
326
327/* Read an UBI debugfs file */
328static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
329 size_t count, loff_t *ppos)
330{
331 unsigned long ubi_num = (unsigned long)file->private_data;
332 struct dentry *dent = file->f_path.dentry;
333 struct ubi_device *ubi;
334 struct ubi_debug_info *d;
335 char buf[16];
336 int val;
337
338 ubi = ubi_get_device(ubi_num);
339 if (!ubi)
340 return -ENODEV;
341 d = &ubi->dbg;
342
343 if (dent == d->dfs_chk_gen)
344 val = d->chk_gen;
345 else if (dent == d->dfs_chk_io)
346 val = d->chk_io;
347 else if (dent == d->dfs_chk_fastmap)
348 val = d->chk_fastmap;
349 else if (dent == d->dfs_disable_bgt)
350 val = d->disable_bgt;
351 else if (dent == d->dfs_emulate_bitflips)
352 val = d->emulate_bitflips;
353 else if (dent == d->dfs_emulate_io_failures)
354 val = d->emulate_io_failures;
355 else if (dent == d->dfs_emulate_failures) {
356 snprintf(buf, size: sizeof(buf), fmt: "0x%04x\n", d->emulate_failures);
357 count = simple_read_from_buffer(to: user_buf, count, ppos,
358 from: buf, strlen(buf));
359 goto out;
360 } else if (dent == d->dfs_emulate_power_cut) {
361 snprintf(buf, size: sizeof(buf), fmt: "%u\n", d->emulate_power_cut);
362 count = simple_read_from_buffer(to: user_buf, count, ppos,
363 from: buf, strlen(buf));
364 goto out;
365 } else if (dent == d->dfs_power_cut_min) {
366 snprintf(buf, size: sizeof(buf), fmt: "%u\n", d->power_cut_min);
367 count = simple_read_from_buffer(to: user_buf, count, ppos,
368 from: buf, strlen(buf));
369 goto out;
370 } else if (dent == d->dfs_power_cut_max) {
371 snprintf(buf, size: sizeof(buf), fmt: "%u\n", d->power_cut_max);
372 count = simple_read_from_buffer(to: user_buf, count, ppos,
373 from: buf, strlen(buf));
374 goto out;
375 } else {
376 count = -EINVAL;
377 goto out;
378 }
379
380 if (val)
381 buf[0] = '1';
382 else
383 buf[0] = '0';
384 buf[1] = '\n';
385 buf[2] = 0x00;
386
387 count = simple_read_from_buffer(to: user_buf, count, ppos, from: buf, available: 2);
388
389out:
390 ubi_put_device(ubi);
391 return count;
392}
393
394/* Write an UBI debugfs file */
395static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
396 size_t count, loff_t *ppos)
397{
398 unsigned long ubi_num = (unsigned long)file->private_data;
399 struct dentry *dent = file->f_path.dentry;
400 struct ubi_device *ubi;
401 struct ubi_debug_info *d;
402 size_t buf_size;
403 char buf[16] = {0};
404 int val;
405
406 ubi = ubi_get_device(ubi_num);
407 if (!ubi)
408 return -ENODEV;
409 d = &ubi->dbg;
410
411 buf_size = min_t(size_t, count, (sizeof(buf) - 1));
412 if (copy_from_user(to: buf, from: user_buf, n: buf_size)) {
413 count = -EFAULT;
414 goto out;
415 }
416
417 if (dent == d->dfs_emulate_failures) {
418 if (kstrtouint(s: buf, base: 0, res: &d->emulate_failures) != 0)
419 count = -EINVAL;
420 goto out;
421 } else if (dent == d->dfs_power_cut_min) {
422 if (kstrtouint(s: buf, base: 0, res: &d->power_cut_min) != 0)
423 count = -EINVAL;
424 goto out;
425 } else if (dent == d->dfs_power_cut_max) {
426 if (kstrtouint(s: buf, base: 0, res: &d->power_cut_max) != 0)
427 count = -EINVAL;
428 goto out;
429 } else if (dent == d->dfs_emulate_power_cut) {
430 if (kstrtoint(s: buf, base: 0, res: &val) != 0)
431 count = -EINVAL;
432 else
433 d->emulate_power_cut = val;
434 goto out;
435 }
436
437 if (buf[0] == '1')
438 val = 1;
439 else if (buf[0] == '0')
440 val = 0;
441 else {
442 count = -EINVAL;
443 goto out;
444 }
445
446 if (dent == d->dfs_chk_gen)
447 d->chk_gen = val;
448 else if (dent == d->dfs_chk_io)
449 d->chk_io = val;
450 else if (dent == d->dfs_chk_fastmap)
451 d->chk_fastmap = val;
452 else if (dent == d->dfs_disable_bgt)
453 d->disable_bgt = val;
454 else if (dent == d->dfs_emulate_bitflips)
455 d->emulate_bitflips = val;
456 else if (dent == d->dfs_emulate_io_failures)
457 d->emulate_io_failures = val;
458 else
459 count = -EINVAL;
460
461out:
462 ubi_put_device(ubi);
463 return count;
464}
465
466/* File operations for all UBI debugfs files except
467 * detailed_erase_block_info
468 */
469static const struct file_operations dfs_fops = {
470 .read = dfs_file_read,
471 .write = dfs_file_write,
472 .open = simple_open,
473 .owner = THIS_MODULE,
474};
475
476/* As long as the position is less then that total number of erase blocks,
477 * we still have more to print.
478 */
479static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos)
480{
481 struct ubi_device *ubi = s->private;
482
483 if (*pos < ubi->peb_count)
484 return pos;
485
486 return NULL;
487}
488
489/* Since we are using the position as the iterator, we just need to check if we
490 * are done and increment the position.
491 */
492static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos)
493{
494 struct ubi_device *ubi = s->private;
495
496 (*pos)++;
497
498 if (*pos < ubi->peb_count)
499 return pos;
500
501 return NULL;
502}
503
504static void eraseblk_count_seq_stop(struct seq_file *s, void *v)
505{
506}
507
508static int eraseblk_count_seq_show(struct seq_file *s, void *iter)
509{
510 struct ubi_device *ubi = s->private;
511 struct ubi_wl_entry *wl;
512 int *block_number = iter;
513 int erase_count = -1;
514 int err;
515
516 /* If this is the start, print a header */
517 if (*block_number == 0)
518 seq_puts(m: s, s: "physical_block_number\terase_count\n");
519
520 err = ubi_io_is_bad(ubi, pnum: *block_number);
521 if (err)
522 return err;
523
524 spin_lock(lock: &ubi->wl_lock);
525
526 wl = ubi->lookuptbl[*block_number];
527 if (wl)
528 erase_count = wl->ec;
529
530 spin_unlock(lock: &ubi->wl_lock);
531
532 if (erase_count < 0)
533 return 0;
534
535 seq_printf(m: s, fmt: "%-22d\t%-11d\n", *block_number, erase_count);
536
537 return 0;
538}
539
540static const struct seq_operations eraseblk_count_seq_ops = {
541 .start = eraseblk_count_seq_start,
542 .next = eraseblk_count_seq_next,
543 .stop = eraseblk_count_seq_stop,
544 .show = eraseblk_count_seq_show
545};
546
547static int eraseblk_count_open(struct inode *inode, struct file *f)
548{
549 struct seq_file *s;
550 int err;
551
552 err = seq_open(f, &eraseblk_count_seq_ops);
553 if (err)
554 return err;
555
556 s = f->private_data;
557 s->private = ubi_get_device(ubi_num: (unsigned long)inode->i_private);
558
559 if (!s->private)
560 return -ENODEV;
561 else
562 return 0;
563}
564
565static int eraseblk_count_release(struct inode *inode, struct file *f)
566{
567 struct seq_file *s = f->private_data;
568 struct ubi_device *ubi = s->private;
569
570 ubi_put_device(ubi);
571
572 return seq_release(inode, f);
573}
574
575static const struct file_operations eraseblk_count_fops = {
576 .owner = THIS_MODULE,
577 .open = eraseblk_count_open,
578 .read = seq_read,
579 .llseek = seq_lseek,
580 .release = eraseblk_count_release,
581};
582
583/**
584 * ubi_debugfs_init_dev - initialize debugfs for an UBI device.
585 * @ubi: UBI device description object
586 *
587 * This function creates all debugfs files for UBI device @ubi. Returns zero in
588 * case of success and a negative error code in case of failure.
589 */
590int ubi_debugfs_init_dev(struct ubi_device *ubi)
591{
592 unsigned long ubi_num = ubi->ubi_num;
593 struct ubi_debug_info *d = &ubi->dbg;
594 umode_t mode = S_IRUSR | S_IWUSR;
595 int n;
596
597 if (!IS_ENABLED(CONFIG_DEBUG_FS))
598 return 0;
599
600 n = snprintf(buf: d->dfs_dir_name, UBI_DFS_DIR_LEN, UBI_DFS_DIR_NAME,
601 ubi->ubi_num);
602 if (n >= UBI_DFS_DIR_LEN) {
603 /* The array size is too small */
604 return -EINVAL;
605 }
606
607 d->dfs_dir = debugfs_create_dir(name: d->dfs_dir_name, parent: dfs_rootdir);
608
609 d->dfs_chk_gen = debugfs_create_file("chk_gen", mode, d->dfs_dir,
610 (void *)ubi_num, &dfs_fops);
611
612 d->dfs_chk_io = debugfs_create_file("chk_io", mode, d->dfs_dir,
613 (void *)ubi_num, &dfs_fops);
614
615 d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", mode,
616 d->dfs_dir, (void *)ubi_num,
617 &dfs_fops);
618
619 d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", mode,
620 d->dfs_dir, (void *)ubi_num,
621 &dfs_fops);
622
623 d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips",
624 mode, d->dfs_dir,
625 (void *)ubi_num,
626 &dfs_fops);
627
628 d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures",
629 mode, d->dfs_dir,
630 (void *)ubi_num,
631 &dfs_fops);
632
633 d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut",
634 mode, d->dfs_dir,
635 (void *)ubi_num,
636 &dfs_fops);
637
638 d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min",
639 mode, d->dfs_dir,
640 (void *)ubi_num, &dfs_fops);
641
642 d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max",
643 mode, d->dfs_dir,
644 (void *)ubi_num, &dfs_fops);
645
646 debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir,
647 (void *)ubi_num, &eraseblk_count_fops);
648
649#ifdef CONFIG_MTD_UBI_FAULT_INJECTION
650 d->dfs_emulate_failures = debugfs_create_file("emulate_failures",
651 mode, d->dfs_dir,
652 (void *)ubi_num,
653 &dfs_fops);
654#endif
655 return 0;
656}
657
658/**
659 * ubi_debugfs_exit_dev - free all debugfs files corresponding to device @ubi
660 * @ubi: UBI device description object
661 */
662void ubi_debugfs_exit_dev(struct ubi_device *ubi)
663{
664 if (IS_ENABLED(CONFIG_DEBUG_FS))
665 debugfs_remove_recursive(dentry: ubi->dbg.dfs_dir);
666}
667
668/**
669 * ubi_dbg_power_cut - emulate a power cut if it is time to do so
670 * @ubi: UBI device description object
671 * @caller: Flags set to indicate from where the function is being called
672 *
673 * Returns non-zero if a power cut was emulated, zero if not.
674 */
675int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
676{
677 unsigned int range;
678
679 if ((ubi->dbg.emulate_power_cut & caller) == 0)
680 return 0;
681
682 if (ubi->dbg.power_cut_counter == 0) {
683 ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min;
684
685 if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
686 range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
687 ubi->dbg.power_cut_counter += get_random_u32_below(ceil: range);
688 }
689 return 0;
690 }
691
692 ubi->dbg.power_cut_counter--;
693 if (ubi->dbg.power_cut_counter)
694 return 0;
695
696 return 1;
697}
698

source code of linux/drivers/mtd/ubi/debug.c