drivers/lightnvm/pblk-sysfs.c

   1 /*
   2  * Copyright (C) 2016 CNEX Labs
   3  * Initial release: Javier Gonzalez <javier@cnexlabs.com>
   4  *                  Matias Bjorling <matias@cnexlabs.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version
   8  * 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * Implementation of a physical block-device target for Open-channel SSDs.
  16  *
  17  * pblk-sysfs.c - pblk's sysfs
  18  *
  19  */
  20
  21 #include "pblk.h"
  22
  23 static ssize_t pblk_sysfs_luns_show(struct pblk *pblk, char *page)
  24 {
  25         struct nvm_tgt_dev *dev = pblk->dev;
  26         struct nvm_geo *geo = &dev->geo;
  27         struct pblk_lun *rlun;
  28         ssize_t sz = 0;
  29         int i;
  30
  31         for (i = 0; i < geo->nr_luns; i++) {
  32                 int active = 1;
  33
  34                 rlun = &pblk->luns[i];
  35                 if (!down_trylock(&rlun->wr_sem)) {
  36                         active = 0;
  37                         up(&rlun->wr_sem);
  38                 }
  39                 sz += snprintf(page + sz, PAGE_SIZE - sz,
  40                                 "pblk: pos:%d, ch:%d, lun:%d - %d\n",
  41                                         i,
  42                                         rlun->bppa.g.ch,
  43                                         rlun->bppa.g.lun,
  44                                         active);
  45         }
  46
  47         return sz;
  48 }
  49
  50 static ssize_t pblk_sysfs_rate_limiter(struct pblk *pblk, char *page)
  51 {
  52         int free_blocks, total_blocks;
  53         int rb_user_max, rb_user_cnt;
  54         int rb_gc_max, rb_gc_cnt, rb_budget, rb_state;
  55
  56         free_blocks = atomic_read(&pblk->rl.free_blocks);
  57         rb_user_max = pblk->rl.rb_user_max;
  58         rb_user_cnt = atomic_read(&pblk->rl.rb_user_cnt);
  59         rb_gc_max = pblk->rl.rb_gc_max;
  60         rb_gc_cnt = atomic_read(&pblk->rl.rb_gc_cnt);
  61         rb_budget = pblk->rl.rb_budget;
  62         rb_state = pblk->rl.rb_state;
  63
  64         total_blocks = pblk->rl.total_blocks;
  65
  66         return snprintf(page, PAGE_SIZE,
  67                 "u:%u/%u,gc:%u/%u(%u/%u)(stop:<%u,full:>%u,free:%d/%d)-%d\n",
  68                                 rb_user_cnt,
  69                                 rb_user_max,
  70                                 rb_gc_cnt,
  71                                 rb_gc_max,
  72                                 rb_state,
  73                                 rb_budget,
  74                                 pblk->rl.low,
  75                                 pblk->rl.high,
  76                                 free_blocks,
  77                                 total_blocks,
  78                                 READ_ONCE(pblk->rl.rb_user_active));
  79 }
  80
  81 static ssize_t pblk_sysfs_gc_state_show(struct pblk *pblk, char *page)
  82 {
  83         int gc_enabled, gc_active;
  84
  85         pblk_gc_sysfs_state_show(pblk, &gc_enabled, &gc_active);
  86         return snprintf(page, PAGE_SIZE, "gc_enabled=%d, gc_active=%d\n",
  87                                         gc_enabled, gc_active);
  88 }
  89
  90 static ssize_t pblk_sysfs_stats(struct pblk *pblk, char *page)
  91 {
  92         ssize_t sz;
  93
  94         sz = snprintf(page, PAGE_SIZE,
  95                         "read_failed=%lu, read_high_ecc=%lu, read_empty=%lu, read_failed_gc=%lu, write_failed=%lu, erase_failed=%lu\n",
  96                         atomic_long_read(&pblk->read_failed),
  97                         atomic_long_read(&pblk->read_high_ecc),
  98                         atomic_long_read(&pblk->read_empty),
  99                         atomic_long_read(&pblk->read_failed_gc),
 100                         atomic_long_read(&pblk->write_failed),
 101                         atomic_long_read(&pblk->erase_failed));
 102
 103         return sz;
 104 }
 105
 106 static ssize_t pblk_sysfs_write_buffer(struct pblk *pblk, char *page)
 107 {
 108         return pblk_rb_sysfs(&pblk->rwb, page);
 109 }
 110
 111 static ssize_t pblk_sysfs_ppaf(struct pblk *pblk, char *page)
 112 {
 113         struct nvm_tgt_dev *dev = pblk->dev;
 114         struct nvm_geo *geo = &dev->geo;
 115         ssize_t sz = 0;
 116
 117         sz = snprintf(page, PAGE_SIZE - sz,
 118                 "g:(b:%d)blk:%d/%d,pg:%d/%d,lun:%d/%d,ch:%d/%d,pl:%d/%d,sec:%d/%d\n",
 119                 pblk->ppaf_bitsize,
 120                 pblk->ppaf.blk_offset, geo->ppaf.blk_len,
 121                 pblk->ppaf.pg_offset, geo->ppaf.pg_len,
 122                 pblk->ppaf.lun_offset, geo->ppaf.lun_len,
 123                 pblk->ppaf.ch_offset, geo->ppaf.ch_len,
 124                 pblk->ppaf.pln_offset, geo->ppaf.pln_len,
 125                 pblk->ppaf.sec_offset, geo->ppaf.sect_len);
 126
 127         sz += snprintf(page + sz, PAGE_SIZE - sz,
 128                 "d:blk:%d/%d,pg:%d/%d,lun:%d/%d,ch:%d/%d,pl:%d/%d,sec:%d/%d\n",
 129                 geo->ppaf.blk_offset, geo->ppaf.blk_len,
 130                 geo->ppaf.pg_offset, geo->ppaf.pg_len,
 131                 geo->ppaf.lun_offset, geo->ppaf.lun_len,
 132                 geo->ppaf.ch_offset, geo->ppaf.ch_len,
 133                 geo->ppaf.pln_offset, geo->ppaf.pln_len,
 134                 geo->ppaf.sect_offset, geo->ppaf.sect_len);
 135
 136         return sz;
 137 }
 138
 139 static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page)
 140 {
 141         struct nvm_tgt_dev *dev = pblk->dev;
 142         struct nvm_geo *geo = &dev->geo;
 143         struct pblk_line_meta *lm = &pblk->lm;
 144         struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 145         struct pblk_line *line;
 146         ssize_t sz = 0;
 147         int nr_free_lines;
 148         int cur_data, cur_log;
 149         int free_line_cnt = 0, closed_line_cnt = 0, emeta_line_cnt = 0;
 150         int d_line_cnt = 0, l_line_cnt = 0;
 151         int gc_full = 0, gc_high = 0, gc_mid = 0, gc_low = 0, gc_empty = 0;
 152         int bad = 0, cor = 0;
 153         int msecs = 0, cur_sec = 0, vsc = 0, sec_in_line = 0;
 154         int map_weight = 0, meta_weight = 0;
 155
 156         spin_lock(&l_mg->free_lock);
 157         cur_data = (l_mg->data_line) ? l_mg->data_line->id : -1;
 158         cur_log = (l_mg->log_line) ? l_mg->log_line->id : -1;
 159         nr_free_lines = l_mg->nr_free_lines;
 160
 161         list_for_each_entry(line, &l_mg->free_list, list)
 162                 free_line_cnt++;
 163         spin_unlock(&l_mg->free_lock);
 164
 165         spin_lock(&l_mg->close_lock);
 166         list_for_each_entry(line, &l_mg->emeta_list, list)
 167                 emeta_line_cnt++;
 168         spin_unlock(&l_mg->close_lock);
 169
 170         spin_lock(&l_mg->gc_lock);
 171         list_for_each_entry(line, &l_mg->gc_full_list, list) {
 172                 if (line->type == PBLK_LINETYPE_DATA)
 173                         d_line_cnt++;
 174                 else if (line->type == PBLK_LINETYPE_LOG)
 175                         l_line_cnt++;
 176                 closed_line_cnt++;
 177                 gc_full++;
 178         }
 179
 180         list_for_each_entry(line, &l_mg->gc_high_list, list) {
 181                 if (line->type == PBLK_LINETYPE_DATA)
 182                         d_line_cnt++;
 183                 else if (line->type == PBLK_LINETYPE_LOG)
 184                         l_line_cnt++;
 185                 closed_line_cnt++;
 186                 gc_high++;
 187         }
 188
 189         list_for_each_entry(line, &l_mg->gc_mid_list, list) {
 190                 if (line->type == PBLK_LINETYPE_DATA)
 191                         d_line_cnt++;
 192                 else if (line->type == PBLK_LINETYPE_LOG)
 193                         l_line_cnt++;
 194                 closed_line_cnt++;
 195                 gc_mid++;
 196         }
 197
 198         list_for_each_entry(line, &l_mg->gc_low_list, list) {
 199                 if (line->type == PBLK_LINETYPE_DATA)
 200                         d_line_cnt++;
 201                 else if (line->type == PBLK_LINETYPE_LOG)
 202                         l_line_cnt++;
 203                 closed_line_cnt++;
 204                 gc_low++;
 205         }
 206
 207         list_for_each_entry(line, &l_mg->gc_empty_list, list) {
 208                 if (line->type == PBLK_LINETYPE_DATA)
 209                         d_line_cnt++;
 210                 else if (line->type == PBLK_LINETYPE_LOG)
 211                         l_line_cnt++;
 212                 closed_line_cnt++;
 213                 gc_empty++;
 214         }
 215
 216         list_for_each_entry(line, &l_mg->bad_list, list)
 217                 bad++;
 218         list_for_each_entry(line, &l_mg->corrupt_list, list)
 219                 cor++;
 220         spin_unlock(&l_mg->gc_lock);
 221
 222         spin_lock(&l_mg->free_lock);
 223         if (l_mg->data_line) {
 224                 cur_sec = l_mg->data_line->cur_sec;
 225                 msecs = l_mg->data_line->left_msecs;
 226                 vsc = le32_to_cpu(*l_mg->data_line->vsc);
 227                 sec_in_line = l_mg->data_line->sec_in_line;
 228                 meta_weight = bitmap_weight(&l_mg->meta_bitmap,
 229                                                         PBLK_DATA_LINES);
 230                 map_weight = bitmap_weight(l_mg->data_line->map_bitmap,
 231                                                         lm->sec_per_line);
 232         }
 233         spin_unlock(&l_mg->free_lock);
 234
 235         if (nr_free_lines != free_line_cnt)
 236                 pr_err("pblk: corrupted free line list:%d/%d\n",
 237                                                 nr_free_lines, free_line_cnt);
 238
 239         sz = snprintf(page, PAGE_SIZE - sz,
 240                 "line: nluns:%d, nblks:%d, nsecs:%d\n",
 241                 geo->nr_luns, lm->blk_per_line, lm->sec_per_line);
 242
 243         sz += snprintf(page + sz, PAGE_SIZE - sz,
 244                 "lines:d:%d,l:%d-f:%d,m:%d/%d,c:%d,b:%d,co:%d(d:%d,l:%d)t:%d\n",
 245                                         cur_data, cur_log,
 246                                         nr_free_lines,
 247                                         emeta_line_cnt, meta_weight,
 248                                         closed_line_cnt,
 249                                         bad, cor,
 250                                         d_line_cnt, l_line_cnt,
 251                                         l_mg->nr_lines);
 252
 253         sz += snprintf(page + sz, PAGE_SIZE - sz,
 254                 "GC: full:%d, high:%d, mid:%d, low:%d, empty:%d, queue:%d\n",
 255                         gc_full, gc_high, gc_mid, gc_low, gc_empty,
 256                         atomic_read(&pblk->gc.inflight_gc));
 257
 258         sz += snprintf(page + sz, PAGE_SIZE - sz,
 259                 "data (%d) cur:%d, left:%d, vsc:%d, s:%d, map:%d/%d (%d)\n",
 260                         cur_data, cur_sec, msecs, vsc, sec_in_line,
 261                         map_weight, lm->sec_per_line,
 262                         atomic_read(&pblk->inflight_io));
 263
 264         return sz;
 265 }
 266
 267 static ssize_t pblk_sysfs_lines_info(struct pblk *pblk, char *page)
 268 {
 269         struct nvm_tgt_dev *dev = pblk->dev;
 270         struct nvm_geo *geo = &dev->geo;
 271         struct pblk_line_meta *lm = &pblk->lm;
 272         ssize_t sz = 0;
 273
 274         sz = snprintf(page, PAGE_SIZE - sz,
 275                                 "smeta - len:%d, secs:%d\n",
 276                                         lm->smeta_len, lm->smeta_sec);
 277         sz += snprintf(page + sz, PAGE_SIZE - sz,
 278                                 "emeta - len:%d, sec:%d, bb_start:%d\n",
 279                                         lm->emeta_len[0], lm->emeta_sec[0],
 280                                         lm->emeta_bb);
 281         sz += snprintf(page + sz, PAGE_SIZE - sz,
 282                                 "bitmap lengths: sec:%d, blk:%d, lun:%d\n",
 283                                         lm->sec_bitmap_len,
 284                                         lm->blk_bitmap_len,
 285                                         lm->lun_bitmap_len);
 286         sz += snprintf(page + sz, PAGE_SIZE - sz,
 287                                 "blk_line:%d, sec_line:%d, sec_blk:%d\n",
 288                                         lm->blk_per_line,
 289                                         lm->sec_per_line,
 290                                         geo->sec_per_blk);
 291
 292         return sz;
 293 }
 294
 295 static ssize_t pblk_sysfs_get_sec_per_write(struct pblk *pblk, char *page)
 296 {
 297         return snprintf(page, PAGE_SIZE, "%d\n", pblk->sec_per_write);
 298 }
 299
 300 #ifdef CONFIG_NVM_DEBUG
 301 static ssize_t pblk_sysfs_stats_debug(struct pblk *pblk, char *page)
 302 {
 303         return snprintf(page, PAGE_SIZE,
 304                 "%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\n",
 305                         atomic_long_read(&pblk->inflight_writes),
 306                         atomic_long_read(&pblk->inflight_reads),
 307                         atomic_long_read(&pblk->req_writes),
 308                         atomic_long_read(&pblk->nr_flush),
 309                         atomic_long_read(&pblk->padded_writes),
 310                         atomic_long_read(&pblk->padded_wb),
 311                         atomic_long_read(&pblk->sub_writes),
 312                         atomic_long_read(&pblk->sync_writes),
 313                         atomic_long_read(&pblk->recov_writes),
 314                         atomic_long_read(&pblk->recov_gc_writes),
 315                         atomic_long_read(&pblk->recov_gc_reads),
 316                         atomic_long_read(&pblk->cache_reads),
 317                         atomic_long_read(&pblk->sync_reads));
 318 }
 319 #endif
 320
 321 static ssize_t pblk_sysfs_gc_force(struct pblk *pblk, const char *page,
 322                                    size_t len)
 323 {
 324         size_t c_len;
 325         int force;
 326
 327         c_len = strcspn(page, "\n");
 328         if (c_len >= len)
 329                 return -EINVAL;
 330
 331         if (kstrtouint(page, 0, &force))
 332                 return -EINVAL;
 333
 334         pblk_gc_sysfs_force(pblk, force);
 335
 336         return len;
 337 }
 338
 339 static ssize_t pblk_sysfs_set_sec_per_write(struct pblk *pblk,
 340                                              const char *page, size_t len)
 341 {
 342         size_t c_len;
 343         int sec_per_write;
 344
 345         c_len = strcspn(page, "\n");
 346         if (c_len >= len)
 347                 return -EINVAL;
 348
 349         if (kstrtouint(page, 0, &sec_per_write))
 350                 return -EINVAL;
 351
 352         if (sec_per_write < pblk->min_write_pgs
 353                                 || sec_per_write > pblk->max_write_pgs
 354                                 || sec_per_write % pblk->min_write_pgs != 0)
 355                 return -EINVAL;
 356
 357         pblk_set_sec_per_write(pblk, sec_per_write);
 358
 359         return len;
 360 }
 361
 362 static struct attribute sys_write_luns = {
 363         .name = "write_luns",
 364         .mode = 0444,
 365 };
 366
 367 static struct attribute sys_rate_limiter_attr = {
 368         .name = "rate_limiter",
 369         .mode = 0444,
 370 };
 371
 372 static struct attribute sys_gc_state = {
 373         .name = "gc_state",
 374         .mode = 0444,
 375 };
 376
 377 static struct attribute sys_errors_attr = {
 378         .name = "errors",
 379         .mode = 0444,
 380 };
 381
 382 static struct attribute sys_rb_attr = {
 383         .name = "write_buffer",
 384         .mode = 0444,
 385 };
 386
 387 static struct attribute sys_stats_ppaf_attr = {
 388         .name = "ppa_format",
 389         .mode = 0444,
 390 };
 391
 392 static struct attribute sys_lines_attr = {
 393         .name = "lines",
 394         .mode = 0444,
 395 };
 396
 397 static struct attribute sys_lines_info_attr = {
 398         .name = "lines_info",
 399         .mode = 0444,
 400 };
 401
 402 static struct attribute sys_gc_force = {
 403         .name = "gc_force",
 404         .mode = 0200,
 405 };
 406
 407 static struct attribute sys_max_sec_per_write = {
 408         .name = "max_sec_per_write",
 409         .mode = 0644,
 410 };
 411
 412 #ifdef CONFIG_NVM_DEBUG
 413 static struct attribute sys_stats_debug_attr = {
 414         .name = "stats",
 415         .mode = 0444,
 416 };
 417 #endif
 418
 419 static struct attribute *pblk_attrs[] = {
 420         &sys_write_luns,
 421         &sys_rate_limiter_attr,
 422         &sys_errors_attr,
 423         &sys_gc_state,
 424         &sys_gc_force,
 425         &sys_max_sec_per_write,
 426         &sys_rb_attr,
 427         &sys_stats_ppaf_attr,
 428         &sys_lines_attr,
 429         &sys_lines_info_attr,
 430 #ifdef CONFIG_NVM_DEBUG
 431         &sys_stats_debug_attr,
 432 #endif
 433         NULL,
 434 };
 435
 436 static ssize_t pblk_sysfs_show(struct kobject *kobj, struct attribute *attr,
 437                                char *buf)
 438 {
 439         struct pblk *pblk = container_of(kobj, struct pblk, kobj);
 440
 441         if (strcmp(attr->name, "rate_limiter") == 0)
 442                 return pblk_sysfs_rate_limiter(pblk, buf);
 443         else if (strcmp(attr->name, "write_luns") == 0)
 444                 return pblk_sysfs_luns_show(pblk, buf);
 445         else if (strcmp(attr->name, "gc_state") == 0)
 446                 return pblk_sysfs_gc_state_show(pblk, buf);
 447         else if (strcmp(attr->name, "errors") == 0)
 448                 return pblk_sysfs_stats(pblk, buf);
 449         else if (strcmp(attr->name, "write_buffer") == 0)
 450                 return pblk_sysfs_write_buffer(pblk, buf);
 451         else if (strcmp(attr->name, "ppa_format") == 0)
 452                 return pblk_sysfs_ppaf(pblk, buf);
 453         else if (strcmp(attr->name, "lines") == 0)
 454                 return pblk_sysfs_lines(pblk, buf);
 455         else if (strcmp(attr->name, "lines_info") == 0)
 456                 return pblk_sysfs_lines_info(pblk, buf);
 457         else if (strcmp(attr->name, "max_sec_per_write") == 0)
 458                 return pblk_sysfs_get_sec_per_write(pblk, buf);
 459 #ifdef CONFIG_NVM_DEBUG
 460         else if (strcmp(attr->name, "stats") == 0)
 461                 return pblk_sysfs_stats_debug(pblk, buf);
 462 #endif
 463         return 0;
 464 }
 465
 466 static ssize_t pblk_sysfs_store(struct kobject *kobj, struct attribute *attr,
 467                                 const char *buf, size_t len)
 468 {
 469         struct pblk *pblk = container_of(kobj, struct pblk, kobj);
 470
 471         if (strcmp(attr->name, "gc_force") == 0)
 472                 return pblk_sysfs_gc_force(pblk, buf, len);
 473         else if (strcmp(attr->name, "max_sec_per_write") == 0)
 474                 return pblk_sysfs_set_sec_per_write(pblk, buf, len);
 475
 476         return 0;
 477 }
 478
 479 static const struct sysfs_ops pblk_sysfs_ops = {
 480         .show = pblk_sysfs_show,
 481         .store = pblk_sysfs_store,
 482 };
 483
 484 static struct kobj_type pblk_ktype = {
 485         .sysfs_ops      = &pblk_sysfs_ops,
 486         .default_attrs  = pblk_attrs,
 487 };
 488
 489 int pblk_sysfs_init(struct gendisk *tdisk)
 490 {
 491         struct pblk *pblk = tdisk->private_data;
 492         struct device *parent_dev = disk_to_dev(pblk->disk);
 493         int ret;
 494
 495         ret = kobject_init_and_add(&pblk->kobj, &pblk_ktype,
 496                                         kobject_get(&parent_dev->kobj),
 497                                         "%s", "pblk");
 498         if (ret) {
 499                 pr_err("pblk: could not register %s/pblk\n",
 500                                                 tdisk->disk_name);
 501                 return ret;
 502         }
 503
 504         kobject_uevent(&pblk->kobj, KOBJ_ADD);
 505         return 0;
 506 }
 507
 508 void pblk_sysfs_exit(struct gendisk *tdisk)
 509 {
 510         struct pblk *pblk = tdisk->private_data;
 511
 512         kobject_uevent(&pblk->kobj, KOBJ_REMOVE);
 513         kobject_del(&pblk->kobj);
 514         kobject_put(&pblk->kobj);
 515 }