1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (c) International Business Machines Corp., 2006 4 * 5 * Author: Artem Bityutskiy (���������������� ����������) 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(ubi->mtd, addr, len, &read, buf); 63 if (err && err != -EUCLEAN) { 64 ubi_err(ubi, "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, "dumping %d bytes of data from PEB %d, offset %d", 70 len, pnum, offset); 71 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); 72out: 73 vfree(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, "", DUMP_PREFIX_OFFSET, 32, 1, 93 ec_hdr, UBI_EC_HDR_SIZE, 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, "", DUMP_PREFIX_OFFSET, 32, 1, 118 vid_hdr, UBI_VID_HDR_SIZE, 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(vol->name, 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(&r->name[0], 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("fault_inject", parent); 251 if (IS_ERR_OR_NULL(dir)) { 252 int err = dir ? PTR_ERR(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("emulate_eccerr", dir, 260 &fault_eccerr_attr); 261 262 fault_create_debugfs_attr("emulate_read_failure", dir, 263 &fault_read_failure_attr); 264 265 fault_create_debugfs_attr("emulate_bitflips", dir, 266 &fault_bitflips_attr); 267 268 fault_create_debugfs_attr("emulate_write_failure", dir, 269 &fault_write_failure_attr); 270 271 fault_create_debugfs_attr("emulate_erase_failure", dir, 272 &fault_erase_failure_attr); 273 274 fault_create_debugfs_attr("emulate_power_cut", dir, 275 &fault_power_cut_attr); 276 277 fault_create_debugfs_attr("emulate_io_ff", dir, 278 &fault_io_ff_attr); 279 280 fault_create_debugfs_attr("emulate_io_ff_bitflips", dir, 281 &fault_io_ff_bitflips_attr); 282 283 fault_create_debugfs_attr("emulate_bad_hdr", dir, 284 &fault_bad_hdr_attr); 285 286 fault_create_debugfs_attr("emulate_bad_hdr_ebadmsg", dir, 287 &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("ubi", NULL); 303 if (IS_ERR_OR_NULL(dfs_rootdir)) { 304 int err = dfs_rootdir ? PTR_ERR(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(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(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, sizeof(buf), "0x%04x\n", d->emulate_failures); 357 count = simple_read_from_buffer(user_buf, count, ppos, 358 buf, strlen(buf)); 359 goto out; 360 } else if (dent == d->dfs_emulate_power_cut) { 361 snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut); 362 count = simple_read_from_buffer(user_buf, count, ppos, 363 buf, strlen(buf)); 364 goto out; 365 } else if (dent == d->dfs_power_cut_min) { 366 snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min); 367 count = simple_read_from_buffer(user_buf, count, ppos, 368 buf, strlen(buf)); 369 goto out; 370 } else if (dent == d->dfs_power_cut_max) { 371 snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max); 372 count = simple_read_from_buffer(user_buf, count, ppos, 373 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(user_buf, count, ppos, buf, 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(buf, user_buf, buf_size)) { 413 count = -EFAULT; 414 goto out; 415 } 416 417 if (dent == d->dfs_emulate_failures) { 418 if (kstrtouint(buf, 0, &d->emulate_failures) != 0) 419 count = -EINVAL; 420 goto out; 421 } else if (dent == d->dfs_power_cut_min) { 422 if (kstrtouint(buf, 0, &d->power_cut_min) != 0) 423 count = -EINVAL; 424 goto out; 425 } else if (dent == d->dfs_power_cut_max) { 426 if (kstrtouint(buf, 0, &d->power_cut_max) != 0) 427 count = -EINVAL; 428 goto out; 429 } else if (dent == d->dfs_emulate_power_cut) { 430 if (kstrtoint(buf, 0, &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 .llseek = no_llseek, 474 .owner = THIS_MODULE, 475}; 476 477/* As long as the position is less then that total number of erase blocks, 478 * we still have more to print. 479 */ 480static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos) 481{ 482 struct ubi_device *ubi = s->private; 483 484 if (*pos < ubi->peb_count) 485 return pos; 486 487 return NULL; 488} 489 490/* Since we are using the position as the iterator, we just need to check if we 491 * are done and increment the position. 492 */ 493static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos) 494{ 495 struct ubi_device *ubi = s->private; 496 497 (*pos)++; 498 499 if (*pos < ubi->peb_count) 500 return pos; 501 502 return NULL; 503} 504 505static void eraseblk_count_seq_stop(struct seq_file *s, void *v) 506{ 507} 508 509static int eraseblk_count_seq_show(struct seq_file *s, void *iter) 510{ 511 struct ubi_device *ubi = s->private; 512 struct ubi_wl_entry *wl; 513 int *block_number = iter; 514 int erase_count = -1; 515 int err; 516 517 /* If this is the start, print a header */ 518 if (*block_number == 0) 519 seq_puts(s, "physical_block_number\terase_count\n"); 520 521 err = ubi_io_is_bad(ubi, *block_number); 522 if (err) 523 return err; 524 525 spin_lock(&ubi->wl_lock); 526 527 wl = ubi->lookuptbl[*block_number]; 528 if (wl) 529 erase_count = wl->ec; 530 531 spin_unlock(&ubi->wl_lock); 532 533 if (erase_count < 0) 534 return 0; 535 536 seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count); 537 538 return 0; 539} 540 541static const struct seq_operations eraseblk_count_seq_ops = { 542 .start = eraseblk_count_seq_start, 543 .next = eraseblk_count_seq_next, 544 .stop = eraseblk_count_seq_stop, 545 .show = eraseblk_count_seq_show 546}; 547 548static int eraseblk_count_open(struct inode *inode, struct file *f) 549{ 550 struct seq_file *s; 551 int err; 552 553 err = seq_open(f, &eraseblk_count_seq_ops); 554 if (err) 555 return err; 556 557 s = f->private_data; 558 s->private = ubi_get_device((unsigned long)inode->i_private); 559 560 if (!s->private) 561 return -ENODEV; 562 else 563 return 0; 564} 565 566static int eraseblk_count_release(struct inode *inode, struct file *f) 567{ 568 struct seq_file *s = f->private_data; 569 struct ubi_device *ubi = s->private; 570 571 ubi_put_device(ubi); 572 573 return seq_release(inode, f); 574} 575 576static const struct file_operations eraseblk_count_fops = { 577 .owner = THIS_MODULE, 578 .open = eraseblk_count_open, 579 .read = seq_read, 580 .llseek = seq_lseek, 581 .release = eraseblk_count_release, 582}; 583 584/** 585 * ubi_debugfs_init_dev - initialize debugfs for an UBI device. 586 * @ubi: UBI device description object 587 * 588 * This function creates all debugfs files for UBI device @ubi. Returns zero in 589 * case of success and a negative error code in case of failure. 590 */ 591int ubi_debugfs_init_dev(struct ubi_device *ubi) 592{ 593 unsigned long ubi_num = ubi->ubi_num; 594 struct ubi_debug_info *d = &ubi->dbg; 595 umode_t mode = S_IRUSR | S_IWUSR; 596 int n; 597 598 if (!IS_ENABLED(CONFIG_DEBUG_FS)) 599 return 0; 600 601 n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, 602 ubi->ubi_num); 603 if (n > UBI_DFS_DIR_LEN) { 604 /* The array size is too small */ 605 return -EINVAL; 606 } 607 608 d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir); 609 610 d->dfs_chk_gen = debugfs_create_file("chk_gen", mode, d->dfs_dir, 611 (void *)ubi_num, &dfs_fops); 612 613 d->dfs_chk_io = debugfs_create_file("chk_io", mode, d->dfs_dir, 614 (void *)ubi_num, &dfs_fops); 615 616 d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", mode, 617 d->dfs_dir, (void *)ubi_num, 618 &dfs_fops); 619 620 d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", mode, 621 d->dfs_dir, (void *)ubi_num, 622 &dfs_fops); 623 624 d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips", 625 mode, d->dfs_dir, 626 (void *)ubi_num, 627 &dfs_fops); 628 629 d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures", 630 mode, d->dfs_dir, 631 (void *)ubi_num, 632 &dfs_fops); 633 634 d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut", 635 mode, d->dfs_dir, 636 (void *)ubi_num, 637 &dfs_fops); 638 639 d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min", 640 mode, d->dfs_dir, 641 (void *)ubi_num, &dfs_fops); 642 643 d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max", 644 mode, d->dfs_dir, 645 (void *)ubi_num, &dfs_fops); 646 647 debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir, 648 (void *)ubi_num, &eraseblk_count_fops); 649 650#ifdef CONFIG_MTD_UBI_FAULT_INJECTION 651 d->dfs_emulate_failures = debugfs_create_file("emulate_failures", 652 mode, d->dfs_dir, 653 (void *)ubi_num, 654 &dfs_fops); 655#endif 656 return 0; 657} 658 659/** 660 * ubi_debugfs_exit_dev - free all debugfs files corresponding to device @ubi 661 * @ubi: UBI device description object 662 */ 663void ubi_debugfs_exit_dev(struct ubi_device *ubi) 664{ 665 if (IS_ENABLED(CONFIG_DEBUG_FS)) 666 debugfs_remove_recursive(ubi->dbg.dfs_dir); 667} 668 669/** 670 * ubi_dbg_power_cut - emulate a power cut if it is time to do so 671 * @ubi: UBI device description object 672 * @caller: Flags set to indicate from where the function is being called 673 * 674 * Returns non-zero if a power cut was emulated, zero if not. 675 */ 676int ubi_dbg_power_cut(struct ubi_device *ubi, int caller) 677{ 678 unsigned int range; 679 680 if ((ubi->dbg.emulate_power_cut & caller) == 0) 681 return 0; 682 683 if (ubi->dbg.power_cut_counter == 0) { 684 ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min; 685 686 if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) { 687 range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min; 688 ubi->dbg.power_cut_counter += get_random_u32_below(range); 689 } 690 return 0; 691 } 692 693 ubi->dbg.power_cut_counter--; 694 if (ubi->dbg.power_cut_counter) 695 return 0; 696 697 return 1; 698} 699