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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 == 0) 397 return SEQ_START_TOKEN; 398 399 if (*pos < ubi->peb_count) 400 return pos; 401 402 return NULL; 403 } 404 405 /* Since we are using the position as the iterator, we just need to check if we 406 * are done and increment the position. 407 */ 408 static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos) 409 { 410 struct ubi_device *ubi = s->private; 411 412 if (v == SEQ_START_TOKEN) 413 return pos; 414 (*pos)++; 415 416 if (*pos < ubi->peb_count) 417 return pos; 418 419 return NULL; 420 } 421 422 static void eraseblk_count_seq_stop(struct seq_file *s, void *v) 423 { 424 } 425 426 static int eraseblk_count_seq_show(struct seq_file *s, void *iter) 427 { 428 struct ubi_device *ubi = s->private; 429 struct ubi_wl_entry *wl; 430 int *block_number = iter; 431 int erase_count = -1; 432 int err; 433 434 /* If this is the start, print a header */ 435 if (iter == SEQ_START_TOKEN) { 436 seq_puts(s, 437 "physical_block_number\terase_count\tblock_status\tread_status\n"); 438 return 0; 439 } 440 441 err = ubi_io_is_bad(ubi, *block_number); 442 if (err) 443 return err; 444 445 spin_lock(&ubi->wl_lock); 446 447 wl = ubi->lookuptbl[*block_number]; 448 if (wl) 449 erase_count = wl->ec; 450 451 spin_unlock(&ubi->wl_lock); 452 453 if (erase_count < 0) 454 return 0; 455 456 seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count); 457 458 return 0; 459 } 460 461 static const struct seq_operations eraseblk_count_seq_ops = { 462 .start = eraseblk_count_seq_start, 463 .next = eraseblk_count_seq_next, 464 .stop = eraseblk_count_seq_stop, 465 .show = eraseblk_count_seq_show 466 }; 467 468 static int eraseblk_count_open(struct inode *inode, struct file *f) 469 { 470 struct seq_file *s; 471 int err; 472 473 err = seq_open(f, &eraseblk_count_seq_ops); 474 if (err) 475 return err; 476 477 s = f->private_data; 478 s->private = ubi_get_device((unsigned long)inode->i_private); 479 480 if (!s->private) 481 return -ENODEV; 482 else 483 return 0; 484 } 485 486 static int eraseblk_count_release(struct inode *inode, struct file *f) 487 { 488 struct seq_file *s = f->private_data; 489 struct ubi_device *ubi = s->private; 490 491 ubi_put_device(ubi); 492 493 return seq_release(inode, f); 494 } 495 496 static const struct file_operations eraseblk_count_fops = { 497 .owner = THIS_MODULE, 498 .open = eraseblk_count_open, 499 .read = seq_read, 500 .llseek = seq_lseek, 501 .release = eraseblk_count_release, 502 }; 503 504 /** 505 * ubi_debugfs_init_dev - initialize debugfs for an UBI device. 506 * @ubi: UBI device description object 507 * 508 * This function creates all debugfs files for UBI device @ubi. Returns zero in 509 * case of success and a negative error code in case of failure. 510 */ 511 int ubi_debugfs_init_dev(struct ubi_device *ubi) 512 { 513 unsigned long ubi_num = ubi->ubi_num; 514 struct ubi_debug_info *d = &ubi->dbg; 515 int n; 516 517 if (!IS_ENABLED(CONFIG_DEBUG_FS)) 518 return 0; 519 520 n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, 521 ubi->ubi_num); 522 if (n == UBI_DFS_DIR_LEN) { 523 /* The array size is too small */ 524 return -EINVAL; 525 } 526 527 d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir); 528 529 d->dfs_chk_gen = debugfs_create_file("chk_gen", S_IWUSR, d->dfs_dir, 530 (void *)ubi_num, &dfs_fops); 531 532 d->dfs_chk_io = debugfs_create_file("chk_io", S_IWUSR, d->dfs_dir, 533 (void *)ubi_num, &dfs_fops); 534 535 d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", S_IWUSR, 536 d->dfs_dir, (void *)ubi_num, 537 &dfs_fops); 538 539 d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", S_IWUSR, 540 d->dfs_dir, (void *)ubi_num, 541 &dfs_fops); 542 543 d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips", 544 S_IWUSR, d->dfs_dir, 545 (void *)ubi_num, 546 &dfs_fops); 547 548 d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures", 549 S_IWUSR, d->dfs_dir, 550 (void *)ubi_num, 551 &dfs_fops); 552 553 d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut", 554 S_IWUSR, d->dfs_dir, 555 (void *)ubi_num, 556 &dfs_fops); 557 558 d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min", 559 S_IWUSR, d->dfs_dir, 560 (void *)ubi_num, &dfs_fops); 561 562 d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max", 563 S_IWUSR, d->dfs_dir, 564 (void *)ubi_num, &dfs_fops); 565 566 debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir, 567 (void *)ubi_num, &eraseblk_count_fops); 568 569 return 0; 570 } 571 572 /** 573 * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi 574 * @ubi: UBI device description object 575 */ 576 void ubi_debugfs_exit_dev(struct ubi_device *ubi) 577 { 578 if (IS_ENABLED(CONFIG_DEBUG_FS)) 579 debugfs_remove_recursive(ubi->dbg.dfs_dir); 580 } 581 582 /** 583 * ubi_dbg_power_cut - emulate a power cut if it is time to do so 584 * @ubi: UBI device description object 585 * @caller: Flags set to indicate from where the function is being called 586 * 587 * Returns non-zero if a power cut was emulated, zero if not. 588 */ 589 int ubi_dbg_power_cut(struct ubi_device *ubi, int caller) 590 { 591 unsigned int range; 592 593 if ((ubi->dbg.emulate_power_cut & caller) == 0) 594 return 0; 595 596 if (ubi->dbg.power_cut_counter == 0) { 597 ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min; 598 599 if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) { 600 range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min; 601 ubi->dbg.power_cut_counter += prandom_u32() % range; 602 } 603 return 0; 604 } 605 606 ubi->dbg.power_cut_counter--; 607 if (ubi->dbg.power_cut_counter) 608 return 0; 609 610 ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX"); 611 ubi_ro_mode(ubi); 612 return 1; 613 } 614