1 /* 2 * Copyright (c) International Business Machines Corp., 2006 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 * 18 * Author: Artem Bityutskiy (Битюцкий Артём) 19 */ 20 21 #include "ubi.h" 22 #include <linux/debugfs.h> 23 #include <linux/uaccess.h> 24 #include <linux/module.h> 25 26 27 /** 28 * ubi_dump_flash - dump a region of flash. 29 * @ubi: UBI device description object 30 * @pnum: the physical eraseblock number to dump 31 * @offset: the starting offset within the physical eraseblock to dump 32 * @len: the length of the region to dump 33 */ 34 void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len) 35 { 36 int err; 37 size_t read; 38 void *buf; 39 loff_t addr = (loff_t)pnum * ubi->peb_size + offset; 40 41 buf = vmalloc(len); 42 if (!buf) 43 return; 44 err = mtd_read(ubi->mtd, addr, len, &read, buf); 45 if (err && err != -EUCLEAN) { 46 ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes", 47 err, len, pnum, offset, read); 48 goto out; 49 } 50 51 ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d", 52 len, pnum, offset); 53 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); 54 out: 55 vfree(buf); 56 return; 57 } 58 59 /** 60 * ubi_dump_ec_hdr - dump an erase counter header. 61 * @ec_hdr: the erase counter header to dump 62 */ 63 void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr) 64 { 65 pr_err("Erase counter header dump:\n"); 66 pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic)); 67 pr_err("\tversion %d\n", (int)ec_hdr->version); 68 pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec)); 69 pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset)); 70 pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset)); 71 pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq)); 72 pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc)); 73 pr_err("erase counter header hexdump:\n"); 74 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, 75 ec_hdr, UBI_EC_HDR_SIZE, 1); 76 } 77 78 /** 79 * ubi_dump_vid_hdr - dump a volume identifier header. 80 * @vid_hdr: the volume identifier header to dump 81 */ 82 void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr) 83 { 84 pr_err("Volume identifier header dump:\n"); 85 pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic)); 86 pr_err("\tversion %d\n", (int)vid_hdr->version); 87 pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type); 88 pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag); 89 pr_err("\tcompat %d\n", (int)vid_hdr->compat); 90 pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id)); 91 pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum)); 92 pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size)); 93 pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs)); 94 pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad)); 95 pr_err("\tsqnum %llu\n", 96 (unsigned long long)be64_to_cpu(vid_hdr->sqnum)); 97 pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc)); 98 pr_err("Volume identifier header hexdump:\n"); 99 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, 100 vid_hdr, UBI_VID_HDR_SIZE, 1); 101 } 102 103 /** 104 * ubi_dump_vol_info - dump volume information. 105 * @vol: UBI volume description object 106 */ 107 void ubi_dump_vol_info(const struct ubi_volume *vol) 108 { 109 pr_err("Volume information dump:\n"); 110 pr_err("\tvol_id %d\n", vol->vol_id); 111 pr_err("\treserved_pebs %d\n", vol->reserved_pebs); 112 pr_err("\talignment %d\n", vol->alignment); 113 pr_err("\tdata_pad %d\n", vol->data_pad); 114 pr_err("\tvol_type %d\n", vol->vol_type); 115 pr_err("\tname_len %d\n", vol->name_len); 116 pr_err("\tusable_leb_size %d\n", vol->usable_leb_size); 117 pr_err("\tused_ebs %d\n", vol->used_ebs); 118 pr_err("\tused_bytes %lld\n", vol->used_bytes); 119 pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes); 120 pr_err("\tcorrupted %d\n", vol->corrupted); 121 pr_err("\tupd_marker %d\n", vol->upd_marker); 122 123 if (vol->name_len <= UBI_VOL_NAME_MAX && 124 strnlen(vol->name, vol->name_len + 1) == vol->name_len) { 125 pr_err("\tname %s\n", vol->name); 126 } else { 127 pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", 128 vol->name[0], vol->name[1], vol->name[2], 129 vol->name[3], vol->name[4]); 130 } 131 } 132 133 /** 134 * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object. 135 * @r: the object to dump 136 * @idx: volume table index 137 */ 138 void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx) 139 { 140 int name_len = be16_to_cpu(r->name_len); 141 142 pr_err("Volume table record %d dump:\n", idx); 143 pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs)); 144 pr_err("\talignment %d\n", be32_to_cpu(r->alignment)); 145 pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad)); 146 pr_err("\tvol_type %d\n", (int)r->vol_type); 147 pr_err("\tupd_marker %d\n", (int)r->upd_marker); 148 pr_err("\tname_len %d\n", name_len); 149 150 if (r->name[0] == '\0') { 151 pr_err("\tname NULL\n"); 152 return; 153 } 154 155 if (name_len <= UBI_VOL_NAME_MAX && 156 strnlen(&r->name[0], name_len + 1) == name_len) { 157 pr_err("\tname %s\n", &r->name[0]); 158 } else { 159 pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", 160 r->name[0], r->name[1], r->name[2], r->name[3], 161 r->name[4]); 162 } 163 pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc)); 164 } 165 166 /** 167 * ubi_dump_av - dump a &struct ubi_ainf_volume object. 168 * @av: the object to dump 169 */ 170 void ubi_dump_av(const struct ubi_ainf_volume *av) 171 { 172 pr_err("Volume attaching information dump:\n"); 173 pr_err("\tvol_id %d\n", av->vol_id); 174 pr_err("\thighest_lnum %d\n", av->highest_lnum); 175 pr_err("\tleb_count %d\n", av->leb_count); 176 pr_err("\tcompat %d\n", av->compat); 177 pr_err("\tvol_type %d\n", av->vol_type); 178 pr_err("\tused_ebs %d\n", av->used_ebs); 179 pr_err("\tlast_data_size %d\n", av->last_data_size); 180 pr_err("\tdata_pad %d\n", av->data_pad); 181 } 182 183 /** 184 * ubi_dump_aeb - dump a &struct ubi_ainf_peb object. 185 * @aeb: the object to dump 186 * @type: object type: 0 - not corrupted, 1 - corrupted 187 */ 188 void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type) 189 { 190 pr_err("eraseblock attaching information dump:\n"); 191 pr_err("\tec %d\n", aeb->ec); 192 pr_err("\tpnum %d\n", aeb->pnum); 193 if (type == 0) { 194 pr_err("\tlnum %d\n", aeb->lnum); 195 pr_err("\tscrub %d\n", aeb->scrub); 196 pr_err("\tsqnum %llu\n", aeb->sqnum); 197 } 198 } 199 200 /** 201 * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object. 202 * @req: the object to dump 203 */ 204 void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req) 205 { 206 char nm[17]; 207 208 pr_err("Volume creation request dump:\n"); 209 pr_err("\tvol_id %d\n", req->vol_id); 210 pr_err("\talignment %d\n", req->alignment); 211 pr_err("\tbytes %lld\n", (long long)req->bytes); 212 pr_err("\tvol_type %d\n", req->vol_type); 213 pr_err("\tname_len %d\n", req->name_len); 214 215 memcpy(nm, req->name, 16); 216 nm[16] = 0; 217 pr_err("\t1st 16 characters of name: %s\n", nm); 218 } 219 220 /* 221 * Root directory for UBI stuff in debugfs. Contains sub-directories which 222 * contain the stuff specific to particular UBI devices. 223 */ 224 static struct dentry *dfs_rootdir; 225 226 /** 227 * ubi_debugfs_init - create UBI debugfs directory. 228 * 229 * Create UBI debugfs directory. Returns zero in case of success and a negative 230 * error code in case of failure. 231 */ 232 int ubi_debugfs_init(void) 233 { 234 if (!IS_ENABLED(CONFIG_DEBUG_FS)) 235 return 0; 236 237 dfs_rootdir = debugfs_create_dir("ubi", NULL); 238 if (IS_ERR_OR_NULL(dfs_rootdir)) { 239 int err = dfs_rootdir ? -ENODEV : PTR_ERR(dfs_rootdir); 240 241 pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n", 242 err); 243 return err; 244 } 245 246 return 0; 247 } 248 249 /** 250 * ubi_debugfs_exit - remove UBI debugfs directory. 251 */ 252 void ubi_debugfs_exit(void) 253 { 254 if (IS_ENABLED(CONFIG_DEBUG_FS)) 255 debugfs_remove(dfs_rootdir); 256 } 257 258 /* Read an UBI debugfs file */ 259 static ssize_t dfs_file_read(struct file *file, char __user *user_buf, 260 size_t count, loff_t *ppos) 261 { 262 unsigned long ubi_num = (unsigned long)file->private_data; 263 struct dentry *dent = file->f_path.dentry; 264 struct ubi_device *ubi; 265 struct ubi_debug_info *d; 266 char buf[8]; 267 int val; 268 269 ubi = ubi_get_device(ubi_num); 270 if (!ubi) 271 return -ENODEV; 272 d = &ubi->dbg; 273 274 if (dent == d->dfs_chk_gen) 275 val = d->chk_gen; 276 else if (dent == d->dfs_chk_io) 277 val = d->chk_io; 278 else if (dent == d->dfs_chk_fastmap) 279 val = d->chk_fastmap; 280 else if (dent == d->dfs_disable_bgt) 281 val = d->disable_bgt; 282 else if (dent == d->dfs_emulate_bitflips) 283 val = d->emulate_bitflips; 284 else if (dent == d->dfs_emulate_io_failures) 285 val = d->emulate_io_failures; 286 else if (dent == d->dfs_emulate_power_cut) { 287 snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut); 288 count = simple_read_from_buffer(user_buf, count, ppos, 289 buf, strlen(buf)); 290 goto out; 291 } else if (dent == d->dfs_power_cut_min) { 292 snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min); 293 count = simple_read_from_buffer(user_buf, count, ppos, 294 buf, strlen(buf)); 295 goto out; 296 } else if (dent == d->dfs_power_cut_max) { 297 snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max); 298 count = simple_read_from_buffer(user_buf, count, ppos, 299 buf, strlen(buf)); 300 goto out; 301 } 302 else { 303 count = -EINVAL; 304 goto out; 305 } 306 307 if (val) 308 buf[0] = '1'; 309 else 310 buf[0] = '0'; 311 buf[1] = '\n'; 312 buf[2] = 0x00; 313 314 count = simple_read_from_buffer(user_buf, count, ppos, buf, 2); 315 316 out: 317 ubi_put_device(ubi); 318 return count; 319 } 320 321 /* Write an UBI debugfs file */ 322 static ssize_t dfs_file_write(struct file *file, const char __user *user_buf, 323 size_t count, loff_t *ppos) 324 { 325 unsigned long ubi_num = (unsigned long)file->private_data; 326 struct dentry *dent = file->f_path.dentry; 327 struct ubi_device *ubi; 328 struct ubi_debug_info *d; 329 size_t buf_size; 330 char buf[8] = {0}; 331 int val; 332 333 ubi = ubi_get_device(ubi_num); 334 if (!ubi) 335 return -ENODEV; 336 d = &ubi->dbg; 337 338 buf_size = min_t(size_t, count, (sizeof(buf) - 1)); 339 if (copy_from_user(buf, user_buf, buf_size)) { 340 count = -EFAULT; 341 goto out; 342 } 343 344 if (dent == d->dfs_power_cut_min) { 345 if (kstrtouint(buf, 0, &d->power_cut_min) != 0) 346 count = -EINVAL; 347 goto out; 348 } else if (dent == d->dfs_power_cut_max) { 349 if (kstrtouint(buf, 0, &d->power_cut_max) != 0) 350 count = -EINVAL; 351 goto out; 352 } else if (dent == d->dfs_emulate_power_cut) { 353 if (kstrtoint(buf, 0, &val) != 0) 354 count = -EINVAL; 355 d->emulate_power_cut = val; 356 goto out; 357 } 358 359 if (buf[0] == '1') 360 val = 1; 361 else if (buf[0] == '0') 362 val = 0; 363 else { 364 count = -EINVAL; 365 goto out; 366 } 367 368 if (dent == d->dfs_chk_gen) 369 d->chk_gen = val; 370 else if (dent == d->dfs_chk_io) 371 d->chk_io = val; 372 else if (dent == d->dfs_chk_fastmap) 373 d->chk_fastmap = val; 374 else if (dent == d->dfs_disable_bgt) 375 d->disable_bgt = val; 376 else if (dent == d->dfs_emulate_bitflips) 377 d->emulate_bitflips = val; 378 else if (dent == d->dfs_emulate_io_failures) 379 d->emulate_io_failures = val; 380 else 381 count = -EINVAL; 382 383 out: 384 ubi_put_device(ubi); 385 return count; 386 } 387 388 /* File operations for all UBI debugfs files */ 389 static const struct file_operations dfs_fops = { 390 .read = dfs_file_read, 391 .write = dfs_file_write, 392 .open = simple_open, 393 .llseek = no_llseek, 394 .owner = THIS_MODULE, 395 }; 396 397 /** 398 * ubi_debugfs_init_dev - initialize debugfs for an UBI device. 399 * @ubi: UBI device description object 400 * 401 * This function creates all debugfs files for UBI device @ubi. Returns zero in 402 * case of success and a negative error code in case of failure. 403 */ 404 int ubi_debugfs_init_dev(struct ubi_device *ubi) 405 { 406 int err, n; 407 unsigned long ubi_num = ubi->ubi_num; 408 const char *fname; 409 struct dentry *dent; 410 struct ubi_debug_info *d = &ubi->dbg; 411 412 if (!IS_ENABLED(CONFIG_DEBUG_FS)) 413 return 0; 414 415 n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, 416 ubi->ubi_num); 417 if (n == UBI_DFS_DIR_LEN) { 418 /* The array size is too small */ 419 fname = UBI_DFS_DIR_NAME; 420 dent = ERR_PTR(-EINVAL); 421 goto out; 422 } 423 424 fname = d->dfs_dir_name; 425 dent = debugfs_create_dir(fname, dfs_rootdir); 426 if (IS_ERR_OR_NULL(dent)) 427 goto out; 428 d->dfs_dir = dent; 429 430 fname = "chk_gen"; 431 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 432 &dfs_fops); 433 if (IS_ERR_OR_NULL(dent)) 434 goto out_remove; 435 d->dfs_chk_gen = dent; 436 437 fname = "chk_io"; 438 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 439 &dfs_fops); 440 if (IS_ERR_OR_NULL(dent)) 441 goto out_remove; 442 d->dfs_chk_io = dent; 443 444 fname = "chk_fastmap"; 445 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 446 &dfs_fops); 447 if (IS_ERR_OR_NULL(dent)) 448 goto out_remove; 449 d->dfs_chk_fastmap = dent; 450 451 fname = "tst_disable_bgt"; 452 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 453 &dfs_fops); 454 if (IS_ERR_OR_NULL(dent)) 455 goto out_remove; 456 d->dfs_disable_bgt = dent; 457 458 fname = "tst_emulate_bitflips"; 459 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 460 &dfs_fops); 461 if (IS_ERR_OR_NULL(dent)) 462 goto out_remove; 463 d->dfs_emulate_bitflips = dent; 464 465 fname = "tst_emulate_io_failures"; 466 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 467 &dfs_fops); 468 if (IS_ERR_OR_NULL(dent)) 469 goto out_remove; 470 d->dfs_emulate_io_failures = dent; 471 472 fname = "tst_emulate_power_cut"; 473 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 474 &dfs_fops); 475 if (IS_ERR_OR_NULL(dent)) 476 goto out_remove; 477 d->dfs_emulate_power_cut = dent; 478 479 fname = "tst_emulate_power_cut_min"; 480 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 481 &dfs_fops); 482 if (IS_ERR_OR_NULL(dent)) 483 goto out_remove; 484 d->dfs_power_cut_min = dent; 485 486 fname = "tst_emulate_power_cut_max"; 487 dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, 488 &dfs_fops); 489 if (IS_ERR_OR_NULL(dent)) 490 goto out_remove; 491 d->dfs_power_cut_max = dent; 492 493 return 0; 494 495 out_remove: 496 debugfs_remove_recursive(d->dfs_dir); 497 out: 498 err = dent ? PTR_ERR(dent) : -ENODEV; 499 ubi_err(ubi, "cannot create \"%s\" debugfs file or directory, error %d\n", 500 fname, err); 501 return err; 502 } 503 504 /** 505 * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi 506 * @ubi: UBI device description object 507 */ 508 void ubi_debugfs_exit_dev(struct ubi_device *ubi) 509 { 510 if (IS_ENABLED(CONFIG_DEBUG_FS)) 511 debugfs_remove_recursive(ubi->dbg.dfs_dir); 512 } 513 514 /** 515 * ubi_dbg_power_cut - emulate a power cut if it is time to do so 516 * @ubi: UBI device description object 517 * @caller: Flags set to indicate from where the function is being called 518 * 519 * Returns non-zero if a power cut was emulated, zero if not. 520 */ 521 int ubi_dbg_power_cut(struct ubi_device *ubi, int caller) 522 { 523 unsigned int range; 524 525 if ((ubi->dbg.emulate_power_cut & caller) == 0) 526 return 0; 527 528 if (ubi->dbg.power_cut_counter == 0) { 529 ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min; 530 531 if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) { 532 range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min; 533 ubi->dbg.power_cut_counter += prandom_u32() % range; 534 } 535 return 0; 536 } 537 538 ubi->dbg.power_cut_counter--; 539 if (ubi->dbg.power_cut_counter) 540 return 0; 541 542 ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX"); 543 ubi_ro_mode(ubi); 544 return 1; 545 } 546