Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 IT University of Copenhagen (rrpc.c) |
| 3 | * Copyright (C) 2016 CNEX Labs |
| 4 | * Initial release: Javier Gonzalez <javier@cnexlabs.com> |
| 5 | * Matias Bjorling <matias@cnexlabs.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License version |
| 9 | * 2 as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * Implementation of a physical block-device target for Open-channel SSDs. |
| 17 | * |
| 18 | * pblk-init.c - pblk's initialization. |
| 19 | */ |
| 20 | |
| 21 | #include "pblk.h" |
| 22 | |
| 23 | static struct kmem_cache *pblk_blk_ws_cache, *pblk_rec_cache, *pblk_r_rq_cache, |
| 24 | *pblk_w_rq_cache, *pblk_line_meta_cache; |
| 25 | static DECLARE_RWSEM(pblk_lock); |
| 26 | |
| 27 | static int pblk_rw_io(struct request_queue *q, struct pblk *pblk, |
| 28 | struct bio *bio) |
| 29 | { |
| 30 | int ret; |
| 31 | |
| 32 | /* Read requests must be <= 256kb due to NVMe's 64 bit completion bitmap |
| 33 | * constraint. Writes can be of arbitrary size. |
| 34 | */ |
| 35 | if (bio_data_dir(bio) == READ) { |
| 36 | blk_queue_split(q, &bio, q->bio_split); |
| 37 | ret = pblk_submit_read(pblk, bio); |
| 38 | if (ret == NVM_IO_DONE && bio_flagged(bio, BIO_CLONED)) |
| 39 | bio_put(bio); |
| 40 | |
| 41 | return ret; |
| 42 | } |
| 43 | |
| 44 | /* Prevent deadlock in the case of a modest LUN configuration and large |
| 45 | * user I/Os. Unless stalled, the rate limiter leaves at least 256KB |
| 46 | * available for user I/O. |
| 47 | */ |
| 48 | if (unlikely(pblk_get_secs(bio) >= pblk_rl_sysfs_rate_show(&pblk->rl))) |
| 49 | blk_queue_split(q, &bio, q->bio_split); |
| 50 | |
| 51 | return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER); |
| 52 | } |
| 53 | |
| 54 | static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio) |
| 55 | { |
| 56 | struct pblk *pblk = q->queuedata; |
| 57 | |
| 58 | if (bio_op(bio) == REQ_OP_DISCARD) { |
| 59 | pblk_discard(pblk, bio); |
| 60 | if (!(bio->bi_opf & REQ_PREFLUSH)) { |
| 61 | bio_endio(bio); |
| 62 | return BLK_QC_T_NONE; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | switch (pblk_rw_io(q, pblk, bio)) { |
| 67 | case NVM_IO_ERR: |
| 68 | bio_io_error(bio); |
| 69 | break; |
| 70 | case NVM_IO_DONE: |
| 71 | bio_endio(bio); |
| 72 | break; |
| 73 | } |
| 74 | |
| 75 | return BLK_QC_T_NONE; |
| 76 | } |
| 77 | |
| 78 | static void pblk_l2p_free(struct pblk *pblk) |
| 79 | { |
| 80 | vfree(pblk->trans_map); |
| 81 | } |
| 82 | |
| 83 | static int pblk_l2p_init(struct pblk *pblk) |
| 84 | { |
| 85 | sector_t i; |
| 86 | struct ppa_addr ppa; |
| 87 | int entry_size = 8; |
| 88 | |
| 89 | if (pblk->ppaf_bitsize < 32) |
| 90 | entry_size = 4; |
| 91 | |
| 92 | pblk->trans_map = vmalloc(entry_size * pblk->rl.nr_secs); |
| 93 | if (!pblk->trans_map) |
| 94 | return -ENOMEM; |
| 95 | |
| 96 | pblk_ppa_set_empty(&ppa); |
| 97 | |
| 98 | for (i = 0; i < pblk->rl.nr_secs; i++) |
| 99 | pblk_trans_map_set(pblk, i, ppa); |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static void pblk_rwb_free(struct pblk *pblk) |
| 105 | { |
| 106 | if (pblk_rb_tear_down_check(&pblk->rwb)) |
| 107 | pr_err("pblk: write buffer error on tear down\n"); |
| 108 | |
| 109 | pblk_rb_data_free(&pblk->rwb); |
| 110 | vfree(pblk_rb_entries_ref(&pblk->rwb)); |
| 111 | } |
| 112 | |
| 113 | static int pblk_rwb_init(struct pblk *pblk) |
| 114 | { |
| 115 | struct nvm_tgt_dev *dev = pblk->dev; |
| 116 | struct nvm_geo *geo = &dev->geo; |
| 117 | struct pblk_rb_entry *entries; |
| 118 | unsigned long nr_entries; |
| 119 | unsigned int power_size, power_seg_sz; |
| 120 | |
| 121 | nr_entries = pblk_rb_calculate_size(pblk->pgs_in_buffer); |
| 122 | |
| 123 | entries = vzalloc(nr_entries * sizeof(struct pblk_rb_entry)); |
| 124 | if (!entries) |
| 125 | return -ENOMEM; |
| 126 | |
| 127 | power_size = get_count_order(nr_entries); |
| 128 | power_seg_sz = get_count_order(geo->sec_size); |
| 129 | |
| 130 | return pblk_rb_init(&pblk->rwb, entries, power_size, power_seg_sz); |
| 131 | } |
| 132 | |
| 133 | /* Minimum pages needed within a lun */ |
| 134 | #define PAGE_POOL_SIZE 16 |
| 135 | #define ADDR_POOL_SIZE 64 |
| 136 | |
| 137 | static int pblk_set_ppaf(struct pblk *pblk) |
| 138 | { |
| 139 | struct nvm_tgt_dev *dev = pblk->dev; |
| 140 | struct nvm_geo *geo = &dev->geo; |
| 141 | struct nvm_addr_format ppaf = geo->ppaf; |
| 142 | int power_len; |
| 143 | |
| 144 | /* Re-calculate channel and lun format to adapt to configuration */ |
| 145 | power_len = get_count_order(geo->nr_chnls); |
| 146 | if (1 << power_len != geo->nr_chnls) { |
| 147 | pr_err("pblk: supports only power-of-two channel config.\n"); |
| 148 | return -EINVAL; |
| 149 | } |
| 150 | ppaf.ch_len = power_len; |
| 151 | |
| 152 | power_len = get_count_order(geo->luns_per_chnl); |
| 153 | if (1 << power_len != geo->luns_per_chnl) { |
| 154 | pr_err("pblk: supports only power-of-two LUN config.\n"); |
| 155 | return -EINVAL; |
| 156 | } |
| 157 | ppaf.lun_len = power_len; |
| 158 | |
| 159 | pblk->ppaf.sec_offset = 0; |
| 160 | pblk->ppaf.pln_offset = ppaf.sect_len; |
| 161 | pblk->ppaf.ch_offset = pblk->ppaf.pln_offset + ppaf.pln_len; |
| 162 | pblk->ppaf.lun_offset = pblk->ppaf.ch_offset + ppaf.ch_len; |
| 163 | pblk->ppaf.pg_offset = pblk->ppaf.lun_offset + ppaf.lun_len; |
| 164 | pblk->ppaf.blk_offset = pblk->ppaf.pg_offset + ppaf.pg_len; |
| 165 | pblk->ppaf.sec_mask = (1ULL << ppaf.sect_len) - 1; |
| 166 | pblk->ppaf.pln_mask = ((1ULL << ppaf.pln_len) - 1) << |
| 167 | pblk->ppaf.pln_offset; |
| 168 | pblk->ppaf.ch_mask = ((1ULL << ppaf.ch_len) - 1) << |
| 169 | pblk->ppaf.ch_offset; |
| 170 | pblk->ppaf.lun_mask = ((1ULL << ppaf.lun_len) - 1) << |
| 171 | pblk->ppaf.lun_offset; |
| 172 | pblk->ppaf.pg_mask = ((1ULL << ppaf.pg_len) - 1) << |
| 173 | pblk->ppaf.pg_offset; |
| 174 | pblk->ppaf.blk_mask = ((1ULL << ppaf.blk_len) - 1) << |
| 175 | pblk->ppaf.blk_offset; |
| 176 | |
| 177 | pblk->ppaf_bitsize = pblk->ppaf.blk_offset + ppaf.blk_len; |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static int pblk_init_global_caches(struct pblk *pblk) |
| 183 | { |
| 184 | char cache_name[PBLK_CACHE_NAME_LEN]; |
| 185 | |
| 186 | down_write(&pblk_lock); |
| 187 | pblk_blk_ws_cache = kmem_cache_create("pblk_blk_ws", |
| 188 | sizeof(struct pblk_line_ws), 0, 0, NULL); |
| 189 | if (!pblk_blk_ws_cache) { |
| 190 | up_write(&pblk_lock); |
| 191 | return -ENOMEM; |
| 192 | } |
| 193 | |
| 194 | pblk_rec_cache = kmem_cache_create("pblk_rec", |
| 195 | sizeof(struct pblk_rec_ctx), 0, 0, NULL); |
| 196 | if (!pblk_rec_cache) { |
| 197 | kmem_cache_destroy(pblk_blk_ws_cache); |
| 198 | up_write(&pblk_lock); |
| 199 | return -ENOMEM; |
| 200 | } |
| 201 | |
| 202 | pblk_r_rq_cache = kmem_cache_create("pblk_r_rq", pblk_r_rq_size, |
| 203 | 0, 0, NULL); |
| 204 | if (!pblk_r_rq_cache) { |
| 205 | kmem_cache_destroy(pblk_blk_ws_cache); |
| 206 | kmem_cache_destroy(pblk_rec_cache); |
| 207 | up_write(&pblk_lock); |
| 208 | return -ENOMEM; |
| 209 | } |
| 210 | |
| 211 | pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size, |
| 212 | 0, 0, NULL); |
| 213 | if (!pblk_w_rq_cache) { |
| 214 | kmem_cache_destroy(pblk_blk_ws_cache); |
| 215 | kmem_cache_destroy(pblk_rec_cache); |
| 216 | kmem_cache_destroy(pblk_r_rq_cache); |
| 217 | up_write(&pblk_lock); |
| 218 | return -ENOMEM; |
| 219 | } |
| 220 | |
| 221 | snprintf(cache_name, sizeof(cache_name), "pblk_line_m_%s", |
| 222 | pblk->disk->disk_name); |
| 223 | pblk_line_meta_cache = kmem_cache_create(cache_name, |
| 224 | pblk->lm.sec_bitmap_len, 0, 0, NULL); |
| 225 | if (!pblk_line_meta_cache) { |
| 226 | kmem_cache_destroy(pblk_blk_ws_cache); |
| 227 | kmem_cache_destroy(pblk_rec_cache); |
| 228 | kmem_cache_destroy(pblk_r_rq_cache); |
| 229 | kmem_cache_destroy(pblk_w_rq_cache); |
| 230 | up_write(&pblk_lock); |
| 231 | return -ENOMEM; |
| 232 | } |
| 233 | up_write(&pblk_lock); |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static int pblk_core_init(struct pblk *pblk) |
| 239 | { |
| 240 | struct nvm_tgt_dev *dev = pblk->dev; |
| 241 | struct nvm_geo *geo = &dev->geo; |
| 242 | int max_write_ppas; |
| 243 | int mod; |
| 244 | |
| 245 | pblk->min_write_pgs = geo->sec_per_pl * (geo->sec_size / PAGE_SIZE); |
| 246 | max_write_ppas = pblk->min_write_pgs * geo->nr_luns; |
| 247 | pblk->max_write_pgs = (max_write_ppas < nvm_max_phys_sects(dev)) ? |
| 248 | max_write_ppas : nvm_max_phys_sects(dev); |
| 249 | pblk->pgs_in_buffer = NVM_MEM_PAGE_WRITE * geo->sec_per_pg * |
| 250 | geo->nr_planes * geo->nr_luns; |
| 251 | |
| 252 | if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) { |
| 253 | pr_err("pblk: cannot support device max_phys_sect\n"); |
| 254 | return -EINVAL; |
| 255 | } |
| 256 | |
| 257 | div_u64_rem(geo->sec_per_blk, pblk->min_write_pgs, &mod); |
| 258 | if (mod) { |
| 259 | pr_err("pblk: bad configuration of sectors/pages\n"); |
| 260 | return -EINVAL; |
| 261 | } |
| 262 | |
| 263 | if (pblk_init_global_caches(pblk)) |
| 264 | return -ENOMEM; |
| 265 | |
| 266 | pblk->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0); |
| 267 | if (!pblk->page_pool) |
| 268 | return -ENOMEM; |
| 269 | |
| 270 | pblk->line_ws_pool = mempool_create_slab_pool(geo->nr_luns, |
| 271 | pblk_blk_ws_cache); |
| 272 | if (!pblk->line_ws_pool) |
| 273 | goto free_page_pool; |
| 274 | |
| 275 | pblk->rec_pool = mempool_create_slab_pool(geo->nr_luns, pblk_rec_cache); |
| 276 | if (!pblk->rec_pool) |
| 277 | goto free_blk_ws_pool; |
| 278 | |
| 279 | pblk->r_rq_pool = mempool_create_slab_pool(64, pblk_r_rq_cache); |
| 280 | if (!pblk->r_rq_pool) |
| 281 | goto free_rec_pool; |
| 282 | |
| 283 | pblk->w_rq_pool = mempool_create_slab_pool(64, pblk_w_rq_cache); |
| 284 | if (!pblk->w_rq_pool) |
| 285 | goto free_r_rq_pool; |
| 286 | |
| 287 | pblk->line_meta_pool = |
| 288 | mempool_create_slab_pool(16, pblk_line_meta_cache); |
| 289 | if (!pblk->line_meta_pool) |
| 290 | goto free_w_rq_pool; |
| 291 | |
| 292 | pblk->kw_wq = alloc_workqueue("pblk-aux-wq", |
| 293 | WQ_MEM_RECLAIM | WQ_UNBOUND, 1); |
| 294 | if (!pblk->kw_wq) |
| 295 | goto free_line_meta_pool; |
| 296 | |
| 297 | if (pblk_set_ppaf(pblk)) |
| 298 | goto free_kw_wq; |
| 299 | |
| 300 | if (pblk_rwb_init(pblk)) |
| 301 | goto free_kw_wq; |
| 302 | |
| 303 | INIT_LIST_HEAD(&pblk->compl_list); |
| 304 | return 0; |
| 305 | |
| 306 | free_kw_wq: |
| 307 | destroy_workqueue(pblk->kw_wq); |
| 308 | free_line_meta_pool: |
| 309 | mempool_destroy(pblk->line_meta_pool); |
| 310 | free_w_rq_pool: |
| 311 | mempool_destroy(pblk->w_rq_pool); |
| 312 | free_r_rq_pool: |
| 313 | mempool_destroy(pblk->r_rq_pool); |
| 314 | free_rec_pool: |
| 315 | mempool_destroy(pblk->rec_pool); |
| 316 | free_blk_ws_pool: |
| 317 | mempool_destroy(pblk->line_ws_pool); |
| 318 | free_page_pool: |
| 319 | mempool_destroy(pblk->page_pool); |
| 320 | return -ENOMEM; |
| 321 | } |
| 322 | |
| 323 | static void pblk_core_free(struct pblk *pblk) |
| 324 | { |
| 325 | if (pblk->kw_wq) |
| 326 | destroy_workqueue(pblk->kw_wq); |
| 327 | |
| 328 | mempool_destroy(pblk->page_pool); |
| 329 | mempool_destroy(pblk->line_ws_pool); |
| 330 | mempool_destroy(pblk->rec_pool); |
| 331 | mempool_destroy(pblk->r_rq_pool); |
| 332 | mempool_destroy(pblk->w_rq_pool); |
| 333 | mempool_destroy(pblk->line_meta_pool); |
| 334 | |
| 335 | kmem_cache_destroy(pblk_blk_ws_cache); |
| 336 | kmem_cache_destroy(pblk_rec_cache); |
| 337 | kmem_cache_destroy(pblk_r_rq_cache); |
| 338 | kmem_cache_destroy(pblk_w_rq_cache); |
| 339 | kmem_cache_destroy(pblk_line_meta_cache); |
| 340 | } |
| 341 | |
| 342 | static void pblk_luns_free(struct pblk *pblk) |
| 343 | { |
| 344 | kfree(pblk->luns); |
| 345 | } |
| 346 | |
| 347 | static void pblk_lines_free(struct pblk *pblk) |
| 348 | { |
| 349 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; |
| 350 | struct pblk_line *line; |
| 351 | int i; |
| 352 | |
| 353 | spin_lock(&l_mg->free_lock); |
| 354 | for (i = 0; i < l_mg->nr_lines; i++) { |
| 355 | line = &pblk->lines[i]; |
| 356 | |
| 357 | pblk_line_free(pblk, line); |
| 358 | kfree(line->blk_bitmap); |
| 359 | kfree(line->erase_bitmap); |
| 360 | } |
| 361 | spin_unlock(&l_mg->free_lock); |
| 362 | } |
| 363 | |
| 364 | static void pblk_line_meta_free(struct pblk *pblk) |
| 365 | { |
| 366 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; |
| 367 | int i; |
| 368 | |
| 369 | kfree(l_mg->bb_template); |
| 370 | kfree(l_mg->bb_aux); |
| 371 | |
| 372 | for (i = 0; i < PBLK_DATA_LINES; i++) { |
| 373 | pblk_mfree(l_mg->sline_meta[i].meta, l_mg->smeta_alloc_type); |
| 374 | pblk_mfree(l_mg->eline_meta[i].meta, l_mg->emeta_alloc_type); |
| 375 | } |
| 376 | |
| 377 | kfree(pblk->lines); |
| 378 | } |
| 379 | |
| 380 | static int pblk_bb_discovery(struct nvm_tgt_dev *dev, struct pblk_lun *rlun) |
| 381 | { |
| 382 | struct nvm_geo *geo = &dev->geo; |
| 383 | struct ppa_addr ppa; |
| 384 | u8 *blks; |
| 385 | int nr_blks, ret; |
| 386 | |
| 387 | nr_blks = geo->blks_per_lun * geo->plane_mode; |
| 388 | blks = kmalloc(nr_blks, GFP_KERNEL); |
| 389 | if (!blks) |
| 390 | return -ENOMEM; |
| 391 | |
| 392 | ppa.ppa = 0; |
| 393 | ppa.g.ch = rlun->bppa.g.ch; |
| 394 | ppa.g.lun = rlun->bppa.g.lun; |
| 395 | |
| 396 | ret = nvm_get_tgt_bb_tbl(dev, ppa, blks); |
| 397 | if (ret) |
| 398 | goto out; |
| 399 | |
| 400 | nr_blks = nvm_bb_tbl_fold(dev->parent, blks, nr_blks); |
| 401 | if (nr_blks < 0) { |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 402 | ret = nr_blks; |
Wei Yongjun | 5136a4f | 2017-04-25 16:15:30 +0000 | [diff] [blame^] | 403 | goto out; |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | rlun->bb_list = blks; |
| 407 | |
Wei Yongjun | 5136a4f | 2017-04-25 16:15:30 +0000 | [diff] [blame^] | 408 | return 0; |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 409 | out: |
Wei Yongjun | 5136a4f | 2017-04-25 16:15:30 +0000 | [diff] [blame^] | 410 | kfree(blks); |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 411 | return ret; |
| 412 | } |
| 413 | |
| 414 | static int pblk_bb_line(struct pblk *pblk, struct pblk_line *line) |
| 415 | { |
| 416 | struct pblk_line_meta *lm = &pblk->lm; |
| 417 | struct pblk_lun *rlun; |
| 418 | int bb_cnt = 0; |
| 419 | int i; |
| 420 | |
| 421 | line->blk_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL); |
| 422 | if (!line->blk_bitmap) |
| 423 | return -ENOMEM; |
| 424 | |
| 425 | line->erase_bitmap = kzalloc(lm->blk_bitmap_len, GFP_KERNEL); |
| 426 | if (!line->erase_bitmap) { |
| 427 | kfree(line->blk_bitmap); |
| 428 | return -ENOMEM; |
| 429 | } |
| 430 | |
| 431 | for (i = 0; i < lm->blk_per_line; i++) { |
| 432 | rlun = &pblk->luns[i]; |
| 433 | if (rlun->bb_list[line->id] == NVM_BLK_T_FREE) |
| 434 | continue; |
| 435 | |
| 436 | set_bit(i, line->blk_bitmap); |
| 437 | bb_cnt++; |
| 438 | } |
| 439 | |
| 440 | return bb_cnt; |
| 441 | } |
| 442 | |
| 443 | static int pblk_luns_init(struct pblk *pblk, struct ppa_addr *luns) |
| 444 | { |
| 445 | struct nvm_tgt_dev *dev = pblk->dev; |
| 446 | struct nvm_geo *geo = &dev->geo; |
| 447 | struct pblk_lun *rlun; |
| 448 | int i, ret; |
| 449 | |
| 450 | /* TODO: Implement unbalanced LUN support */ |
| 451 | if (geo->luns_per_chnl < 0) { |
| 452 | pr_err("pblk: unbalanced LUN config.\n"); |
| 453 | return -EINVAL; |
| 454 | } |
| 455 | |
| 456 | pblk->luns = kcalloc(geo->nr_luns, sizeof(struct pblk_lun), GFP_KERNEL); |
| 457 | if (!pblk->luns) |
| 458 | return -ENOMEM; |
| 459 | |
| 460 | for (i = 0; i < geo->nr_luns; i++) { |
| 461 | /* Stripe across channels */ |
| 462 | int ch = i % geo->nr_chnls; |
| 463 | int lun_raw = i / geo->nr_chnls; |
| 464 | int lunid = lun_raw + ch * geo->luns_per_chnl; |
| 465 | |
| 466 | rlun = &pblk->luns[i]; |
| 467 | rlun->bppa = luns[lunid]; |
| 468 | |
| 469 | sema_init(&rlun->wr_sem, 1); |
| 470 | |
| 471 | ret = pblk_bb_discovery(dev, rlun); |
| 472 | if (ret) { |
| 473 | while (--i >= 0) |
| 474 | kfree(pblk->luns[i].bb_list); |
| 475 | return ret; |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | static int pblk_lines_configure(struct pblk *pblk, int flags) |
| 483 | { |
| 484 | struct pblk_line *line = NULL; |
| 485 | int ret = 0; |
| 486 | |
| 487 | if (!(flags & NVM_TARGET_FACTORY)) { |
| 488 | line = pblk_recov_l2p(pblk); |
| 489 | if (IS_ERR(line)) { |
| 490 | pr_err("pblk: could not recover l2p table\n"); |
| 491 | ret = -EFAULT; |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | if (!line) { |
| 496 | /* Configure next line for user data */ |
| 497 | line = pblk_line_get_first_data(pblk); |
| 498 | if (!line) { |
| 499 | pr_err("pblk: line list corrupted\n"); |
| 500 | ret = -EFAULT; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | return ret; |
| 505 | } |
| 506 | |
| 507 | /* See comment over struct line_emeta definition */ |
| 508 | static unsigned int calc_emeta_len(struct pblk *pblk, struct pblk_line_meta *lm) |
| 509 | { |
| 510 | return (sizeof(struct line_emeta) + |
| 511 | ((lm->sec_per_line - lm->emeta_sec) * sizeof(u64)) + |
| 512 | (pblk->l_mg.nr_lines * sizeof(u32)) + |
| 513 | lm->blk_bitmap_len); |
| 514 | } |
| 515 | |
| 516 | static void pblk_set_provision(struct pblk *pblk, long nr_free_blks) |
| 517 | { |
| 518 | struct nvm_tgt_dev *dev = pblk->dev; |
| 519 | struct nvm_geo *geo = &dev->geo; |
| 520 | sector_t provisioned; |
| 521 | |
| 522 | pblk->over_pct = 20; |
| 523 | |
| 524 | provisioned = nr_free_blks; |
| 525 | provisioned *= (100 - pblk->over_pct); |
| 526 | sector_div(provisioned, 100); |
| 527 | |
| 528 | /* Internally pblk manages all free blocks, but all calculations based |
| 529 | * on user capacity consider only provisioned blocks |
| 530 | */ |
| 531 | pblk->rl.total_blocks = nr_free_blks; |
| 532 | pblk->rl.nr_secs = nr_free_blks * geo->sec_per_blk; |
| 533 | pblk->capacity = provisioned * geo->sec_per_blk; |
| 534 | atomic_set(&pblk->rl.free_blocks, nr_free_blks); |
| 535 | } |
| 536 | |
| 537 | static int pblk_lines_init(struct pblk *pblk) |
| 538 | { |
| 539 | struct nvm_tgt_dev *dev = pblk->dev; |
| 540 | struct nvm_geo *geo = &dev->geo; |
| 541 | struct pblk_line_mgmt *l_mg = &pblk->l_mg; |
| 542 | struct pblk_line_meta *lm = &pblk->lm; |
| 543 | struct pblk_line *line; |
| 544 | unsigned int smeta_len, emeta_len; |
| 545 | long nr_bad_blks, nr_meta_blks, nr_free_blks; |
| 546 | int bb_distance; |
| 547 | int i; |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 548 | int ret; |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 549 | |
| 550 | lm->sec_per_line = geo->sec_per_blk * geo->nr_luns; |
| 551 | lm->blk_per_line = geo->nr_luns; |
| 552 | lm->blk_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long); |
| 553 | lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long); |
| 554 | lm->lun_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long); |
| 555 | lm->high_thrs = lm->sec_per_line / 2; |
| 556 | lm->mid_thrs = lm->sec_per_line / 4; |
| 557 | |
| 558 | /* Calculate necessary pages for smeta. See comment over struct |
| 559 | * line_smeta definition |
| 560 | */ |
| 561 | lm->smeta_len = sizeof(struct line_smeta) + |
| 562 | PBLK_LINE_NR_LUN_BITMAP * lm->lun_bitmap_len; |
| 563 | |
| 564 | i = 1; |
| 565 | add_smeta_page: |
| 566 | lm->smeta_sec = i * geo->sec_per_pl; |
| 567 | lm->smeta_len = lm->smeta_sec * geo->sec_size; |
| 568 | |
| 569 | smeta_len = sizeof(struct line_smeta) + |
| 570 | PBLK_LINE_NR_LUN_BITMAP * lm->lun_bitmap_len; |
| 571 | if (smeta_len > lm->smeta_len) { |
| 572 | i++; |
| 573 | goto add_smeta_page; |
| 574 | } |
| 575 | |
| 576 | /* Calculate necessary pages for emeta. See comment over struct |
| 577 | * line_emeta definition |
| 578 | */ |
| 579 | i = 1; |
| 580 | add_emeta_page: |
| 581 | lm->emeta_sec = i * geo->sec_per_pl; |
| 582 | lm->emeta_len = lm->emeta_sec * geo->sec_size; |
| 583 | |
| 584 | emeta_len = calc_emeta_len(pblk, lm); |
| 585 | if (emeta_len > lm->emeta_len) { |
| 586 | i++; |
| 587 | goto add_emeta_page; |
| 588 | } |
| 589 | lm->emeta_bb = geo->nr_luns - i; |
| 590 | |
| 591 | nr_meta_blks = (lm->smeta_sec + lm->emeta_sec + |
| 592 | (geo->sec_per_blk / 2)) / geo->sec_per_blk; |
| 593 | lm->min_blk_line = nr_meta_blks + 1; |
| 594 | |
| 595 | l_mg->nr_lines = geo->blks_per_lun; |
| 596 | l_mg->log_line = l_mg->data_line = NULL; |
| 597 | l_mg->l_seq_nr = l_mg->d_seq_nr = 0; |
| 598 | l_mg->nr_free_lines = 0; |
| 599 | bitmap_zero(&l_mg->meta_bitmap, PBLK_DATA_LINES); |
| 600 | |
| 601 | /* smeta is always small enough to fit on a kmalloc memory allocation, |
| 602 | * emeta depends on the number of LUNs allocated to the pblk instance |
| 603 | */ |
| 604 | l_mg->smeta_alloc_type = PBLK_KMALLOC_META; |
| 605 | for (i = 0; i < PBLK_DATA_LINES; i++) { |
| 606 | l_mg->sline_meta[i].meta = kmalloc(lm->smeta_len, GFP_KERNEL); |
| 607 | if (!l_mg->sline_meta[i].meta) |
| 608 | while (--i >= 0) { |
| 609 | kfree(l_mg->sline_meta[i].meta); |
| 610 | ret = -ENOMEM; |
| 611 | goto fail; |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | if (lm->emeta_len > KMALLOC_MAX_CACHE_SIZE) { |
| 616 | l_mg->emeta_alloc_type = PBLK_VMALLOC_META; |
| 617 | |
| 618 | for (i = 0; i < PBLK_DATA_LINES; i++) { |
| 619 | l_mg->eline_meta[i].meta = vmalloc(lm->emeta_len); |
| 620 | if (!l_mg->eline_meta[i].meta) |
| 621 | while (--i >= 0) { |
| 622 | vfree(l_mg->eline_meta[i].meta); |
| 623 | ret = -ENOMEM; |
| 624 | goto fail; |
| 625 | } |
| 626 | } |
| 627 | } else { |
| 628 | l_mg->emeta_alloc_type = PBLK_KMALLOC_META; |
| 629 | |
| 630 | for (i = 0; i < PBLK_DATA_LINES; i++) { |
| 631 | l_mg->eline_meta[i].meta = |
| 632 | kmalloc(lm->emeta_len, GFP_KERNEL); |
| 633 | if (!l_mg->eline_meta[i].meta) |
| 634 | while (--i >= 0) { |
| 635 | kfree(l_mg->eline_meta[i].meta); |
| 636 | ret = -ENOMEM; |
| 637 | goto fail; |
| 638 | } |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | l_mg->bb_template = kzalloc(lm->sec_bitmap_len, GFP_KERNEL); |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 643 | if (!l_mg->bb_template) { |
| 644 | ret = -ENOMEM; |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 645 | goto fail_free_meta; |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 646 | } |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 647 | |
| 648 | l_mg->bb_aux = kzalloc(lm->sec_bitmap_len, GFP_KERNEL); |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 649 | if (!l_mg->bb_aux) { |
| 650 | ret = -ENOMEM; |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 651 | goto fail_free_bb_template; |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 652 | } |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 653 | |
| 654 | bb_distance = (geo->nr_luns) * geo->sec_per_pl; |
| 655 | for (i = 0; i < lm->sec_per_line; i += bb_distance) |
| 656 | bitmap_set(l_mg->bb_template, i, geo->sec_per_pl); |
| 657 | |
| 658 | INIT_LIST_HEAD(&l_mg->free_list); |
| 659 | INIT_LIST_HEAD(&l_mg->corrupt_list); |
| 660 | INIT_LIST_HEAD(&l_mg->bad_list); |
| 661 | INIT_LIST_HEAD(&l_mg->gc_full_list); |
| 662 | INIT_LIST_HEAD(&l_mg->gc_high_list); |
| 663 | INIT_LIST_HEAD(&l_mg->gc_mid_list); |
| 664 | INIT_LIST_HEAD(&l_mg->gc_low_list); |
| 665 | INIT_LIST_HEAD(&l_mg->gc_empty_list); |
| 666 | |
| 667 | l_mg->gc_lists[0] = &l_mg->gc_high_list; |
| 668 | l_mg->gc_lists[1] = &l_mg->gc_mid_list; |
| 669 | l_mg->gc_lists[2] = &l_mg->gc_low_list; |
| 670 | |
| 671 | spin_lock_init(&l_mg->free_lock); |
| 672 | spin_lock_init(&l_mg->gc_lock); |
| 673 | |
| 674 | pblk->lines = kcalloc(l_mg->nr_lines, sizeof(struct pblk_line), |
| 675 | GFP_KERNEL); |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 676 | if (!pblk->lines) { |
| 677 | ret = -ENOMEM; |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 678 | goto fail_free_bb_aux; |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 679 | } |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 680 | |
| 681 | nr_free_blks = 0; |
| 682 | for (i = 0; i < l_mg->nr_lines; i++) { |
Javier González | a44f53f | 2017-04-22 01:32:49 +0200 | [diff] [blame] | 683 | int blk_in_line; |
| 684 | |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 685 | line = &pblk->lines[i]; |
| 686 | |
| 687 | line->pblk = pblk; |
| 688 | line->id = i; |
| 689 | line->type = PBLK_LINETYPE_FREE; |
| 690 | line->state = PBLK_LINESTATE_FREE; |
| 691 | line->gc_group = PBLK_LINEGC_NONE; |
| 692 | spin_lock_init(&line->lock); |
| 693 | |
| 694 | nr_bad_blks = pblk_bb_line(pblk, line); |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 695 | if (nr_bad_blks < 0 || nr_bad_blks > lm->blk_per_line) { |
| 696 | ret = -EINVAL; |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 697 | goto fail_free_lines; |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 698 | } |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 699 | |
Javier González | a44f53f | 2017-04-22 01:32:49 +0200 | [diff] [blame] | 700 | blk_in_line = lm->blk_per_line - nr_bad_blks; |
| 701 | if (blk_in_line < lm->min_blk_line) { |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 702 | line->state = PBLK_LINESTATE_BAD; |
| 703 | list_add_tail(&line->list, &l_mg->bad_list); |
| 704 | continue; |
| 705 | } |
| 706 | |
Javier González | a44f53f | 2017-04-22 01:32:49 +0200 | [diff] [blame] | 707 | nr_free_blks += blk_in_line; |
| 708 | atomic_set(&line->blk_in_line, blk_in_line); |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 709 | |
| 710 | l_mg->nr_free_lines++; |
| 711 | list_add_tail(&line->list, &l_mg->free_list); |
| 712 | } |
| 713 | |
| 714 | pblk_set_provision(pblk, nr_free_blks); |
| 715 | |
| 716 | sema_init(&pblk->erase_sem, 1); |
| 717 | |
| 718 | /* Cleanup per-LUN bad block lists - managed within lines on run-time */ |
| 719 | for (i = 0; i < geo->nr_luns; i++) |
| 720 | kfree(pblk->luns[i].bb_list); |
| 721 | |
| 722 | return 0; |
| 723 | fail_free_lines: |
| 724 | kfree(pblk->lines); |
| 725 | fail_free_bb_aux: |
| 726 | kfree(l_mg->bb_aux); |
| 727 | fail_free_bb_template: |
| 728 | kfree(l_mg->bb_template); |
| 729 | fail_free_meta: |
| 730 | for (i = 0; i < PBLK_DATA_LINES; i++) { |
| 731 | pblk_mfree(l_mg->sline_meta[i].meta, l_mg->smeta_alloc_type); |
| 732 | pblk_mfree(l_mg->eline_meta[i].meta, l_mg->emeta_alloc_type); |
| 733 | } |
| 734 | fail: |
| 735 | for (i = 0; i < geo->nr_luns; i++) |
| 736 | kfree(pblk->luns[i].bb_list); |
| 737 | |
| 738 | return ret; |
| 739 | } |
| 740 | |
| 741 | static int pblk_writer_init(struct pblk *pblk) |
| 742 | { |
| 743 | setup_timer(&pblk->wtimer, pblk_write_timer_fn, (unsigned long)pblk); |
| 744 | mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(100)); |
| 745 | |
| 746 | pblk->writer_ts = kthread_create(pblk_write_ts, pblk, "pblk-writer-t"); |
| 747 | if (IS_ERR(pblk->writer_ts)) { |
| 748 | pr_err("pblk: could not allocate writer kthread\n"); |
Dan Carpenter | 1c6286f | 2017-04-15 20:55:53 +0200 | [diff] [blame] | 749 | return PTR_ERR(pblk->writer_ts); |
Javier González | a4bd217 | 2017-04-15 20:55:50 +0200 | [diff] [blame] | 750 | } |
| 751 | |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | static void pblk_writer_stop(struct pblk *pblk) |
| 756 | { |
| 757 | if (pblk->writer_ts) |
| 758 | kthread_stop(pblk->writer_ts); |
| 759 | del_timer(&pblk->wtimer); |
| 760 | } |
| 761 | |
| 762 | static void pblk_free(struct pblk *pblk) |
| 763 | { |
| 764 | pblk_luns_free(pblk); |
| 765 | pblk_lines_free(pblk); |
| 766 | pblk_line_meta_free(pblk); |
| 767 | pblk_core_free(pblk); |
| 768 | pblk_l2p_free(pblk); |
| 769 | |
| 770 | kfree(pblk); |
| 771 | } |
| 772 | |
| 773 | static void pblk_tear_down(struct pblk *pblk) |
| 774 | { |
| 775 | pblk_flush_writer(pblk); |
| 776 | pblk_writer_stop(pblk); |
| 777 | pblk_rb_sync_l2p(&pblk->rwb); |
| 778 | pblk_recov_pad(pblk); |
| 779 | pblk_rwb_free(pblk); |
| 780 | pblk_rl_free(&pblk->rl); |
| 781 | |
| 782 | pr_debug("pblk: consistent tear down\n"); |
| 783 | } |
| 784 | |
| 785 | static void pblk_exit(void *private) |
| 786 | { |
| 787 | struct pblk *pblk = private; |
| 788 | |
| 789 | down_write(&pblk_lock); |
| 790 | pblk_gc_exit(pblk); |
| 791 | pblk_tear_down(pblk); |
| 792 | pblk_free(pblk); |
| 793 | up_write(&pblk_lock); |
| 794 | } |
| 795 | |
| 796 | static sector_t pblk_capacity(void *private) |
| 797 | { |
| 798 | struct pblk *pblk = private; |
| 799 | |
| 800 | return pblk->capacity * NR_PHY_IN_LOG; |
| 801 | } |
| 802 | |
| 803 | static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk, |
| 804 | int flags) |
| 805 | { |
| 806 | struct nvm_geo *geo = &dev->geo; |
| 807 | struct request_queue *bqueue = dev->q; |
| 808 | struct request_queue *tqueue = tdisk->queue; |
| 809 | struct pblk *pblk; |
| 810 | int ret; |
| 811 | |
| 812 | if (dev->identity.dom & NVM_RSP_L2P) { |
| 813 | pr_err("pblk: device-side L2P table not supported. (%x)\n", |
| 814 | dev->identity.dom); |
| 815 | return ERR_PTR(-EINVAL); |
| 816 | } |
| 817 | |
| 818 | pblk = kzalloc(sizeof(struct pblk), GFP_KERNEL); |
| 819 | if (!pblk) |
| 820 | return ERR_PTR(-ENOMEM); |
| 821 | |
| 822 | pblk->dev = dev; |
| 823 | pblk->disk = tdisk; |
| 824 | |
| 825 | spin_lock_init(&pblk->trans_lock); |
| 826 | spin_lock_init(&pblk->lock); |
| 827 | |
| 828 | if (flags & NVM_TARGET_FACTORY) |
| 829 | pblk_setup_uuid(pblk); |
| 830 | |
| 831 | #ifdef CONFIG_NVM_DEBUG |
| 832 | atomic_long_set(&pblk->inflight_writes, 0); |
| 833 | atomic_long_set(&pblk->padded_writes, 0); |
| 834 | atomic_long_set(&pblk->padded_wb, 0); |
| 835 | atomic_long_set(&pblk->nr_flush, 0); |
| 836 | atomic_long_set(&pblk->req_writes, 0); |
| 837 | atomic_long_set(&pblk->sub_writes, 0); |
| 838 | atomic_long_set(&pblk->sync_writes, 0); |
| 839 | atomic_long_set(&pblk->compl_writes, 0); |
| 840 | atomic_long_set(&pblk->inflight_reads, 0); |
| 841 | atomic_long_set(&pblk->sync_reads, 0); |
| 842 | atomic_long_set(&pblk->recov_writes, 0); |
| 843 | atomic_long_set(&pblk->recov_writes, 0); |
| 844 | atomic_long_set(&pblk->recov_gc_writes, 0); |
| 845 | #endif |
| 846 | |
| 847 | atomic_long_set(&pblk->read_failed, 0); |
| 848 | atomic_long_set(&pblk->read_empty, 0); |
| 849 | atomic_long_set(&pblk->read_high_ecc, 0); |
| 850 | atomic_long_set(&pblk->read_failed_gc, 0); |
| 851 | atomic_long_set(&pblk->write_failed, 0); |
| 852 | atomic_long_set(&pblk->erase_failed, 0); |
| 853 | |
| 854 | ret = pblk_luns_init(pblk, dev->luns); |
| 855 | if (ret) { |
| 856 | pr_err("pblk: could not initialize luns\n"); |
| 857 | goto fail; |
| 858 | } |
| 859 | |
| 860 | ret = pblk_lines_init(pblk); |
| 861 | if (ret) { |
| 862 | pr_err("pblk: could not initialize lines\n"); |
| 863 | goto fail_free_luns; |
| 864 | } |
| 865 | |
| 866 | ret = pblk_core_init(pblk); |
| 867 | if (ret) { |
| 868 | pr_err("pblk: could not initialize core\n"); |
| 869 | goto fail_free_line_meta; |
| 870 | } |
| 871 | |
| 872 | ret = pblk_l2p_init(pblk); |
| 873 | if (ret) { |
| 874 | pr_err("pblk: could not initialize maps\n"); |
| 875 | goto fail_free_core; |
| 876 | } |
| 877 | |
| 878 | ret = pblk_lines_configure(pblk, flags); |
| 879 | if (ret) { |
| 880 | pr_err("pblk: could not configure lines\n"); |
| 881 | goto fail_free_l2p; |
| 882 | } |
| 883 | |
| 884 | ret = pblk_writer_init(pblk); |
| 885 | if (ret) { |
| 886 | pr_err("pblk: could not initialize write thread\n"); |
| 887 | goto fail_free_lines; |
| 888 | } |
| 889 | |
| 890 | ret = pblk_gc_init(pblk); |
| 891 | if (ret) { |
| 892 | pr_err("pblk: could not initialize gc\n"); |
| 893 | goto fail_stop_writer; |
| 894 | } |
| 895 | |
| 896 | /* inherit the size from the underlying device */ |
| 897 | blk_queue_logical_block_size(tqueue, queue_physical_block_size(bqueue)); |
| 898 | blk_queue_max_hw_sectors(tqueue, queue_max_hw_sectors(bqueue)); |
| 899 | |
| 900 | blk_queue_write_cache(tqueue, true, false); |
| 901 | |
| 902 | tqueue->limits.discard_granularity = geo->pgs_per_blk * geo->pfpg_size; |
| 903 | tqueue->limits.discard_alignment = 0; |
| 904 | blk_queue_max_discard_sectors(tqueue, UINT_MAX >> 9); |
| 905 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, tqueue); |
| 906 | |
| 907 | pr_info("pblk init: luns:%u, lines:%d, secs:%llu, buf entries:%u\n", |
| 908 | geo->nr_luns, pblk->l_mg.nr_lines, |
| 909 | (unsigned long long)pblk->rl.nr_secs, |
| 910 | pblk->rwb.nr_entries); |
| 911 | |
| 912 | wake_up_process(pblk->writer_ts); |
| 913 | return pblk; |
| 914 | |
| 915 | fail_stop_writer: |
| 916 | pblk_writer_stop(pblk); |
| 917 | fail_free_lines: |
| 918 | pblk_lines_free(pblk); |
| 919 | fail_free_l2p: |
| 920 | pblk_l2p_free(pblk); |
| 921 | fail_free_core: |
| 922 | pblk_core_free(pblk); |
| 923 | fail_free_line_meta: |
| 924 | pblk_line_meta_free(pblk); |
| 925 | fail_free_luns: |
| 926 | pblk_luns_free(pblk); |
| 927 | fail: |
| 928 | kfree(pblk); |
| 929 | return ERR_PTR(ret); |
| 930 | } |
| 931 | |
| 932 | /* physical block device target */ |
| 933 | static struct nvm_tgt_type tt_pblk = { |
| 934 | .name = "pblk", |
| 935 | .version = {1, 0, 0}, |
| 936 | |
| 937 | .make_rq = pblk_make_rq, |
| 938 | .capacity = pblk_capacity, |
| 939 | |
| 940 | .init = pblk_init, |
| 941 | .exit = pblk_exit, |
| 942 | |
| 943 | .sysfs_init = pblk_sysfs_init, |
| 944 | .sysfs_exit = pblk_sysfs_exit, |
| 945 | }; |
| 946 | |
| 947 | static int __init pblk_module_init(void) |
| 948 | { |
| 949 | return nvm_register_tgt_type(&tt_pblk); |
| 950 | } |
| 951 | |
| 952 | static void pblk_module_exit(void) |
| 953 | { |
| 954 | nvm_unregister_tgt_type(&tt_pblk); |
| 955 | } |
| 956 | |
| 957 | module_init(pblk_module_init); |
| 958 | module_exit(pblk_module_exit); |
| 959 | MODULE_AUTHOR("Javier Gonzalez <javier@cnexlabs.com>"); |
| 960 | MODULE_AUTHOR("Matias Bjorling <matias@cnexlabs.com>"); |
| 961 | MODULE_LICENSE("GPL v2"); |
| 962 | MODULE_DESCRIPTION("Physical Block-Device for Open-Channel SSDs"); |