1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2015 IT University of Copenhagen. All rights reserved. 4 * Initial release: Matias Bjorling <m@bjorling.me> 5 */ 6 7#define pr_fmt(fmt) "nvm: " fmt 8 9#include <linux/list.h> 10#include <linux/types.h> 11#include <linux/sem.h> 12#include <linux/bitmap.h> 13#include <linux/module.h> 14#include <linux/moduleparam.h> 15#include <linux/miscdevice.h> 16#include <linux/lightnvm.h> 17#include <linux/sched/sysctl.h> 18 19static LIST_HEAD(nvm_tgt_types); 20static DECLARE_RWSEM(nvm_tgtt_lock); 21static LIST_HEAD(nvm_devices); 22static DECLARE_RWSEM(nvm_lock); 23 24/* Map between virtual and physical channel and lun */ 25struct nvm_ch_map { 26 int ch_off; 27 int num_lun; 28 int *lun_offs; 29}; 30 31struct nvm_dev_map { 32 struct nvm_ch_map *chnls; 33 int num_ch; 34}; 35 36static void nvm_free(struct kref *ref); 37 38static struct nvm_target *nvm_find_target(struct nvm_dev *dev, const char *name) 39{ 40 struct nvm_target *tgt; 41 42 list_for_each_entry(tgt, &dev->targets, list) 43 if (!strcmp(name, tgt->disk->disk_name)) 44 return tgt; 45 46 return NULL; 47} 48 49static bool nvm_target_exists(const char *name) 50{ 51 struct nvm_dev *dev; 52 struct nvm_target *tgt; 53 bool ret = false; 54 55 down_write(&nvm_lock); 56 list_for_each_entry(dev, &nvm_devices, devices) { 57 mutex_lock(&dev->mlock); 58 list_for_each_entry(tgt, &dev->targets, list) { 59 if (!strcmp(name, tgt->disk->disk_name)) { 60 ret = true; 61 mutex_unlock(&dev->mlock); 62 goto out; 63 } 64 } 65 mutex_unlock(&dev->mlock); 66 } 67 68out: 69 up_write(&nvm_lock); 70 return ret; 71} 72 73static int nvm_reserve_luns(struct nvm_dev *dev, int lun_begin, int lun_end) 74{ 75 int i; 76 77 for (i = lun_begin; i <= lun_end; i++) { 78 if (test_and_set_bit(i, dev->lun_map)) { 79 pr_err("lun %d already allocated\n", i); 80 goto err; 81 } 82 } 83 84 return 0; 85err: 86 while (--i >= lun_begin) 87 clear_bit(i, dev->lun_map); 88 89 return -EBUSY; 90} 91 92static void nvm_release_luns_err(struct nvm_dev *dev, int lun_begin, 93 int lun_end) 94{ 95 int i; 96 97 for (i = lun_begin; i <= lun_end; i++) 98 WARN_ON(!test_and_clear_bit(i, dev->lun_map)); 99} 100 101static void nvm_remove_tgt_dev(struct nvm_tgt_dev *tgt_dev, int clear) 102{ 103 struct nvm_dev *dev = tgt_dev->parent; 104 struct nvm_dev_map *dev_map = tgt_dev->map; 105 int i, j; 106 107 for (i = 0; i < dev_map->num_ch; i++) { 108 struct nvm_ch_map *ch_map = &dev_map->chnls[i]; 109 int *lun_offs = ch_map->lun_offs; 110 int ch = i + ch_map->ch_off; 111 112 if (clear) { 113 for (j = 0; j < ch_map->num_lun; j++) { 114 int lun = j + lun_offs[j]; 115 int lunid = (ch * dev->geo.num_lun) + lun; 116 117 WARN_ON(!test_and_clear_bit(lunid, 118 dev->lun_map)); 119 } 120 } 121 122 kfree(ch_map->lun_offs); 123 } 124 125 kfree(dev_map->chnls); 126 kfree(dev_map); 127 128 kfree(tgt_dev->luns); 129 kfree(tgt_dev); 130} 131 132static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev, 133 u16 lun_begin, u16 lun_end, 134 u16 op) 135{ 136 struct nvm_tgt_dev *tgt_dev = NULL; 137 struct nvm_dev_map *dev_rmap = dev->rmap; 138 struct nvm_dev_map *dev_map; 139 struct ppa_addr *luns; 140 int num_lun = lun_end - lun_begin + 1; 141 int luns_left = num_lun; 142 int num_ch = num_lun / dev->geo.num_lun; 143 int num_ch_mod = num_lun % dev->geo.num_lun; 144 int bch = lun_begin / dev->geo.num_lun; 145 int blun = lun_begin % dev->geo.num_lun; 146 int lunid = 0; 147 int lun_balanced = 1; 148 int sec_per_lun, prev_num_lun; 149 int i, j; 150 151 num_ch = (num_ch_mod == 0) ? num_ch : num_ch + 1; 152 153 dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL); 154 if (!dev_map) 155 goto err_dev; 156 157 dev_map->chnls = kcalloc(num_ch, sizeof(struct nvm_ch_map), GFP_KERNEL); 158 if (!dev_map->chnls) 159 goto err_chnls; 160 161 luns = kcalloc(num_lun, sizeof(struct ppa_addr), GFP_KERNEL); 162 if (!luns) 163 goto err_luns; 164 165 prev_num_lun = (luns_left > dev->geo.num_lun) ? 166 dev->geo.num_lun : luns_left; 167 for (i = 0; i < num_ch; i++) { 168 struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[i + bch]; 169 int *lun_roffs = ch_rmap->lun_offs; 170 struct nvm_ch_map *ch_map = &dev_map->chnls[i]; 171 int *lun_offs; 172 int luns_in_chnl = (luns_left > dev->geo.num_lun) ? 173 dev->geo.num_lun : luns_left; 174 175 if (lun_balanced && prev_num_lun != luns_in_chnl) 176 lun_balanced = 0; 177 178 ch_map->ch_off = ch_rmap->ch_off = bch; 179 ch_map->num_lun = luns_in_chnl; 180 181 lun_offs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL); 182 if (!lun_offs) 183 goto err_ch; 184 185 for (j = 0; j < luns_in_chnl; j++) { 186 luns[lunid].ppa = 0; 187 luns[lunid].a.ch = i; 188 luns[lunid++].a.lun = j; 189 190 lun_offs[j] = blun; 191 lun_roffs[j + blun] = blun; 192 } 193 194 ch_map->lun_offs = lun_offs; 195 196 /* when starting a new channel, lun offset is reset */ 197 blun = 0; 198 luns_left -= luns_in_chnl; 199 } 200 201 dev_map->num_ch = num_ch; 202 203 tgt_dev = kmalloc(sizeof(struct nvm_tgt_dev), GFP_KERNEL); 204 if (!tgt_dev) 205 goto err_ch; 206 207 /* Inherit device geometry from parent */ 208 memcpy(&tgt_dev->geo, &dev->geo, sizeof(struct nvm_geo)); 209 210 /* Target device only owns a portion of the physical device */ 211 tgt_dev->geo.num_ch = num_ch; 212 tgt_dev->geo.num_lun = (lun_balanced) ? prev_num_lun : -1; 213 tgt_dev->geo.all_luns = num_lun; 214 tgt_dev->geo.all_chunks = num_lun * dev->geo.num_chk; 215 216 tgt_dev->geo.op = op; 217 218 sec_per_lun = dev->geo.clba * dev->geo.num_chk; 219 tgt_dev->geo.total_secs = num_lun * sec_per_lun; 220 221 tgt_dev->q = dev->q; 222 tgt_dev->map = dev_map; 223 tgt_dev->luns = luns; 224 tgt_dev->parent = dev; 225 226 return tgt_dev; 227err_ch: 228 while (--i >= 0) 229 kfree(dev_map->chnls[i].lun_offs); 230 kfree(luns); 231err_luns: 232 kfree(dev_map->chnls); 233err_chnls: 234 kfree(dev_map); 235err_dev: 236 return tgt_dev; 237} 238 239static struct nvm_tgt_type *__nvm_find_target_type(const char *name) 240{ 241 struct nvm_tgt_type *tt; 242 243 list_for_each_entry(tt, &nvm_tgt_types, list) 244 if (!strcmp(name, tt->name)) 245 return tt; 246 247 return NULL; 248} 249 250static struct nvm_tgt_type *nvm_find_target_type(const char *name) 251{ 252 struct nvm_tgt_type *tt; 253 254 down_write(&nvm_tgtt_lock); 255 tt = __nvm_find_target_type(name); 256 up_write(&nvm_tgtt_lock); 257 258 return tt; 259} 260 261static int nvm_config_check_luns(struct nvm_geo *geo, int lun_begin, 262 int lun_end) 263{ 264 if (lun_begin > lun_end || lun_end >= geo->all_luns) { 265 pr_err("lun out of bound (%u:%u > %u)\n", 266 lun_begin, lun_end, geo->all_luns - 1); 267 return -EINVAL; 268 } 269 270 return 0; 271} 272 273static int __nvm_config_simple(struct nvm_dev *dev, 274 struct nvm_ioctl_create_simple *s) 275{ 276 struct nvm_geo *geo = &dev->geo; 277 278 if (s->lun_begin == -1 && s->lun_end == -1) { 279 s->lun_begin = 0; 280 s->lun_end = geo->all_luns - 1; 281 } 282 283 return nvm_config_check_luns(geo, s->lun_begin, s->lun_end); 284} 285 286static int __nvm_config_extended(struct nvm_dev *dev, 287 struct nvm_ioctl_create_extended *e) 288{ 289 if (e->lun_begin == 0xFFFF && e->lun_end == 0xFFFF) { 290 e->lun_begin = 0; 291 e->lun_end = dev->geo.all_luns - 1; 292 } 293 294 /* op not set falls into target's default */ 295 if (e->op == 0xFFFF) { 296 e->op = NVM_TARGET_DEFAULT_OP; 297 } else if (e->op < NVM_TARGET_MIN_OP || e->op > NVM_TARGET_MAX_OP) { 298 pr_err("invalid over provisioning value\n"); 299 return -EINVAL; 300 } 301 302 return nvm_config_check_luns(&dev->geo, e->lun_begin, e->lun_end); 303} 304 305static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) 306{ 307 struct nvm_ioctl_create_extended e; 308 struct request_queue *tqueue; 309 struct gendisk *tdisk; 310 struct nvm_tgt_type *tt; 311 struct nvm_target *t; 312 struct nvm_tgt_dev *tgt_dev; 313 void *targetdata; 314 unsigned int mdts; 315 int ret; 316 317 switch (create->conf.type) { 318 case NVM_CONFIG_TYPE_SIMPLE: 319 ret = __nvm_config_simple(dev, &create->conf.s); 320 if (ret) 321 return ret; 322 323 e.lun_begin = create->conf.s.lun_begin; 324 e.lun_end = create->conf.s.lun_end; 325 e.op = NVM_TARGET_DEFAULT_OP; 326 break; 327 case NVM_CONFIG_TYPE_EXTENDED: 328 ret = __nvm_config_extended(dev, &create->conf.e); 329 if (ret) 330 return ret; 331 332 e = create->conf.e; 333 break; 334 default: 335 pr_err("config type not valid\n"); 336 return -EINVAL; 337 } 338 339 tt = nvm_find_target_type(create->tgttype); 340 if (!tt) { 341 pr_err("target type %s not found\n", create->tgttype); 342 return -EINVAL; 343 } 344 345 if ((tt->flags & NVM_TGT_F_HOST_L2P) != (dev->geo.dom & NVM_RSP_L2P)) { 346 pr_err("device is incompatible with target L2P type.\n"); 347 return -EINVAL; 348 } 349 350 if (nvm_target_exists(create->tgtname)) { 351 pr_err("target name already exists (%s)\n", 352 create->tgtname); 353 return -EINVAL; 354 } 355 356 ret = nvm_reserve_luns(dev, e.lun_begin, e.lun_end); 357 if (ret) 358 return ret; 359 360 t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL); 361 if (!t) { 362 ret = -ENOMEM; 363 goto err_reserve; 364 } 365 366 tgt_dev = nvm_create_tgt_dev(dev, e.lun_begin, e.lun_end, e.op); 367 if (!tgt_dev) { 368 pr_err("could not create target device\n"); 369 ret = -ENOMEM; 370 goto err_t; 371 } 372 373 tdisk = alloc_disk(0); 374 if (!tdisk) { 375 ret = -ENOMEM; 376 goto err_dev; 377 } 378 379 tqueue = blk_alloc_queue(dev->q->node); 380 if (!tqueue) { 381 ret = -ENOMEM; 382 goto err_disk; 383 } 384 385 strlcpy(tdisk->disk_name, create->tgtname, sizeof(tdisk->disk_name)); 386 tdisk->flags = GENHD_FL_EXT_DEVT; 387 tdisk->major = 0; 388 tdisk->first_minor = 0; 389 tdisk->fops = tt->bops; 390 tdisk->queue = tqueue; 391 392 targetdata = tt->init(tgt_dev, tdisk, create->flags); 393 if (IS_ERR(targetdata)) { 394 ret = PTR_ERR(targetdata); 395 goto err_init; 396 } 397 398 tdisk->private_data = targetdata; 399 tqueue->queuedata = targetdata; 400 401 mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA; 402 if (dev->geo.mdts) { 403 mdts = min_t(u32, dev->geo.mdts, 404 (dev->geo.csecs >> 9) * NVM_MAX_VLBA); 405 } 406 blk_queue_max_hw_sectors(tqueue, mdts); 407 408 set_capacity(tdisk, tt->capacity(targetdata)); 409 add_disk(tdisk); 410 411 if (tt->sysfs_init && tt->sysfs_init(tdisk)) { 412 ret = -ENOMEM; 413 goto err_sysfs; 414 } 415 416 t->type = tt; 417 t->disk = tdisk; 418 t->dev = tgt_dev; 419 420 mutex_lock(&dev->mlock); 421 list_add_tail(&t->list, &dev->targets); 422 mutex_unlock(&dev->mlock); 423 424 __module_get(tt->owner); 425 426 return 0; 427err_sysfs: 428 if (tt->exit) 429 tt->exit(targetdata, true); 430err_init: 431 blk_cleanup_queue(tqueue); 432 tdisk->queue = NULL; 433err_disk: 434 put_disk(tdisk); 435err_dev: 436 nvm_remove_tgt_dev(tgt_dev, 0); 437err_t: 438 kfree(t); 439err_reserve: 440 nvm_release_luns_err(dev, e.lun_begin, e.lun_end); 441 return ret; 442} 443 444static void __nvm_remove_target(struct nvm_target *t, bool graceful) 445{ 446 struct nvm_tgt_type *tt = t->type; 447 struct gendisk *tdisk = t->disk; 448 struct request_queue *q = tdisk->queue; 449 450 del_gendisk(tdisk); 451 blk_cleanup_queue(q); 452 453 if (tt->sysfs_exit) 454 tt->sysfs_exit(tdisk); 455 456 if (tt->exit) 457 tt->exit(tdisk->private_data, graceful); 458 459 nvm_remove_tgt_dev(t->dev, 1); 460 put_disk(tdisk); 461 module_put(t->type->owner); 462 463 list_del(&t->list); 464 kfree(t); 465} 466 467/** 468 * nvm_remove_tgt - Removes a target from the media manager 469 * @remove: ioctl structure with target name to remove. 470 * 471 * Returns: 472 * 0: on success 473 * 1: on not found 474 * <0: on error 475 */ 476static int nvm_remove_tgt(struct nvm_ioctl_remove *remove) 477{ 478 struct nvm_target *t = NULL; 479 struct nvm_dev *dev; 480 481 down_read(&nvm_lock); 482 list_for_each_entry(dev, &nvm_devices, devices) { 483 mutex_lock(&dev->mlock); 484 t = nvm_find_target(dev, remove->tgtname); 485 if (t) { 486 mutex_unlock(&dev->mlock); 487 break; 488 } 489 mutex_unlock(&dev->mlock); 490 } 491 up_read(&nvm_lock); 492 493 if (!t) { 494 pr_err("failed to remove target %s\n", 495 remove->tgtname); 496 return 1; 497 } 498 499 __nvm_remove_target(t, true); 500 kref_put(&dev->ref, nvm_free); 501 502 return 0; 503} 504 505static int nvm_register_map(struct nvm_dev *dev) 506{ 507 struct nvm_dev_map *rmap; 508 int i, j; 509 510 rmap = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL); 511 if (!rmap) 512 goto err_rmap; 513 514 rmap->chnls = kcalloc(dev->geo.num_ch, sizeof(struct nvm_ch_map), 515 GFP_KERNEL); 516 if (!rmap->chnls) 517 goto err_chnls; 518 519 for (i = 0; i < dev->geo.num_ch; i++) { 520 struct nvm_ch_map *ch_rmap; 521 int *lun_roffs; 522 int luns_in_chnl = dev->geo.num_lun; 523 524 ch_rmap = &rmap->chnls[i]; 525 526 ch_rmap->ch_off = -1; 527 ch_rmap->num_lun = luns_in_chnl; 528 529 lun_roffs = kcalloc(luns_in_chnl, sizeof(int), GFP_KERNEL); 530 if (!lun_roffs) 531 goto err_ch; 532 533 for (j = 0; j < luns_in_chnl; j++) 534 lun_roffs[j] = -1; 535 536 ch_rmap->lun_offs = lun_roffs; 537 } 538 539 dev->rmap = rmap; 540 541 return 0; 542err_ch: 543 while (--i >= 0) 544 kfree(rmap->chnls[i].lun_offs); 545err_chnls: 546 kfree(rmap); 547err_rmap: 548 return -ENOMEM; 549} 550 551static void nvm_unregister_map(struct nvm_dev *dev) 552{ 553 struct nvm_dev_map *rmap = dev->rmap; 554 int i; 555 556 for (i = 0; i < dev->geo.num_ch; i++) 557 kfree(rmap->chnls[i].lun_offs); 558 559 kfree(rmap->chnls); 560 kfree(rmap); 561} 562 563static void nvm_map_to_dev(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p) 564{ 565 struct nvm_dev_map *dev_map = tgt_dev->map; 566 struct nvm_ch_map *ch_map = &dev_map->chnls[p->a.ch]; 567 int lun_off = ch_map->lun_offs[p->a.lun]; 568 569 p->a.ch += ch_map->ch_off; 570 p->a.lun += lun_off; 571} 572 573static void nvm_map_to_tgt(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *p) 574{ 575 struct nvm_dev *dev = tgt_dev->parent; 576 struct nvm_dev_map *dev_rmap = dev->rmap; 577 struct nvm_ch_map *ch_rmap = &dev_rmap->chnls[p->a.ch]; 578 int lun_roff = ch_rmap->lun_offs[p->a.lun]; 579 580 p->a.ch -= ch_rmap->ch_off; 581 p->a.lun -= lun_roff; 582} 583 584static void nvm_ppa_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, 585 struct ppa_addr *ppa_list, int nr_ppas) 586{ 587 int i; 588 589 for (i = 0; i < nr_ppas; i++) { 590 nvm_map_to_dev(tgt_dev, &ppa_list[i]); 591 ppa_list[i] = generic_to_dev_addr(tgt_dev->parent, ppa_list[i]); 592 } 593} 594 595static void nvm_ppa_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, 596 struct ppa_addr *ppa_list, int nr_ppas) 597{ 598 int i; 599 600 for (i = 0; i < nr_ppas; i++) { 601 ppa_list[i] = dev_to_generic_addr(tgt_dev->parent, ppa_list[i]); 602 nvm_map_to_tgt(tgt_dev, &ppa_list[i]); 603 } 604} 605 606static void nvm_rq_tgt_to_dev(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) 607{ 608 struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); 609 610 nvm_ppa_tgt_to_dev(tgt_dev, ppa_list, rqd->nr_ppas); 611} 612 613static void nvm_rq_dev_to_tgt(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) 614{ 615 struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); 616 617 nvm_ppa_dev_to_tgt(tgt_dev, ppa_list, rqd->nr_ppas); 618} 619 620int nvm_register_tgt_type(struct nvm_tgt_type *tt) 621{ 622 int ret = 0; 623 624 down_write(&nvm_tgtt_lock); 625 if (__nvm_find_target_type(tt->name)) 626 ret = -EEXIST; 627 else 628 list_add(&tt->list, &nvm_tgt_types); 629 up_write(&nvm_tgtt_lock); 630 631 return ret; 632} 633EXPORT_SYMBOL(nvm_register_tgt_type); 634 635void nvm_unregister_tgt_type(struct nvm_tgt_type *tt) 636{ 637 if (!tt) 638 return; 639 640 down_write(&nvm_tgtt_lock); 641 list_del(&tt->list); 642 up_write(&nvm_tgtt_lock); 643} 644EXPORT_SYMBOL(nvm_unregister_tgt_type); 645 646void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags, 647 dma_addr_t *dma_handler) 648{ 649 return dev->ops->dev_dma_alloc(dev, dev->dma_pool, mem_flags, 650 dma_handler); 651} 652EXPORT_SYMBOL(nvm_dev_dma_alloc); 653 654void nvm_dev_dma_free(struct nvm_dev *dev, void *addr, dma_addr_t dma_handler) 655{ 656 dev->ops->dev_dma_free(dev->dma_pool, addr, dma_handler); 657} 658EXPORT_SYMBOL(nvm_dev_dma_free); 659 660static struct nvm_dev *nvm_find_nvm_dev(const char *name) 661{ 662 struct nvm_dev *dev; 663 664 list_for_each_entry(dev, &nvm_devices, devices) 665 if (!strcmp(name, dev->name)) 666 return dev; 667 668 return NULL; 669} 670 671static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, 672 const struct ppa_addr *ppas, int nr_ppas) 673{ 674 struct nvm_dev *dev = tgt_dev->parent; 675 struct nvm_geo *geo = &tgt_dev->geo; 676 int i, plane_cnt, pl_idx; 677 struct ppa_addr ppa; 678 679 if (geo->pln_mode == NVM_PLANE_SINGLE && nr_ppas == 1) { 680 rqd->nr_ppas = nr_ppas; 681 rqd->ppa_addr = ppas[0]; 682 683 return 0; 684 } 685 686 rqd->nr_ppas = nr_ppas; 687 rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list); 688 if (!rqd->ppa_list) { 689 pr_err("failed to allocate dma memory\n"); 690 return -ENOMEM; 691 } 692 693 plane_cnt = geo->pln_mode; 694 rqd->nr_ppas *= plane_cnt; 695 696 for (i = 0; i < nr_ppas; i++) { 697 for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { 698 ppa = ppas[i]; 699 ppa.g.pl = pl_idx; 700 rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa; 701 } 702 } 703 704 return 0; 705} 706 707static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, 708 struct nvm_rq *rqd) 709{ 710 if (!rqd->ppa_list) 711 return; 712 713 nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list); 714} 715 716static int nvm_set_flags(struct nvm_geo *geo, struct nvm_rq *rqd) 717{ 718 int flags = 0; 719 720 if (geo->version == NVM_OCSSD_SPEC_20) 721 return 0; 722 723 if (rqd->is_seq) 724 flags |= geo->pln_mode >> 1; 725 726 if (rqd->opcode == NVM_OP_PREAD) 727 flags |= (NVM_IO_SCRAMBLE_ENABLE | NVM_IO_SUSPEND); 728 else if (rqd->opcode == NVM_OP_PWRITE) 729 flags |= NVM_IO_SCRAMBLE_ENABLE; 730 731 return flags; 732} 733 734int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, void *buf) 735{ 736 struct nvm_dev *dev = tgt_dev->parent; 737 int ret; 738 739 if (!dev->ops->submit_io) 740 return -ENODEV; 741 742 nvm_rq_tgt_to_dev(tgt_dev, rqd); 743 744 rqd->dev = tgt_dev; 745 rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd); 746 747 /* In case of error, fail with right address format */ 748 ret = dev->ops->submit_io(dev, rqd, buf); 749 if (ret) 750 nvm_rq_dev_to_tgt(tgt_dev, rqd); 751 return ret; 752} 753EXPORT_SYMBOL(nvm_submit_io); 754 755static void nvm_sync_end_io(struct nvm_rq *rqd) 756{ 757 struct completion *waiting = rqd->private; 758 759 complete(waiting); 760} 761 762static int nvm_submit_io_wait(struct nvm_dev *dev, struct nvm_rq *rqd, 763 void *buf) 764{ 765 DECLARE_COMPLETION_ONSTACK(wait); 766 int ret = 0; 767 768 rqd->end_io = nvm_sync_end_io; 769 rqd->private = &wait; 770 771 ret = dev->ops->submit_io(dev, rqd, buf); 772 if (ret) 773 return ret; 774 775 wait_for_completion_io(&wait); 776 777 return 0; 778} 779 780int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, 781 void *buf) 782{ 783 struct nvm_dev *dev = tgt_dev->parent; 784 int ret; 785 786 if (!dev->ops->submit_io) 787 return -ENODEV; 788 789 nvm_rq_tgt_to_dev(tgt_dev, rqd); 790 791 rqd->dev = tgt_dev; 792 rqd->flags = nvm_set_flags(&tgt_dev->geo, rqd); 793 794 ret = nvm_submit_io_wait(dev, rqd, buf); 795 796 return ret; 797} 798EXPORT_SYMBOL(nvm_submit_io_sync); 799 800void nvm_end_io(struct nvm_rq *rqd) 801{ 802 struct nvm_tgt_dev *tgt_dev = rqd->dev; 803 804 /* Convert address space */ 805 if (tgt_dev) 806 nvm_rq_dev_to_tgt(tgt_dev, rqd); 807 808 if (rqd->end_io) 809 rqd->end_io(rqd); 810} 811EXPORT_SYMBOL(nvm_end_io); 812 813static int nvm_submit_io_sync_raw(struct nvm_dev *dev, struct nvm_rq *rqd) 814{ 815 if (!dev->ops->submit_io) 816 return -ENODEV; 817 818 rqd->dev = NULL; 819 rqd->flags = nvm_set_flags(&dev->geo, rqd); 820 821 return nvm_submit_io_wait(dev, rqd, NULL); 822} 823 824static int nvm_bb_chunk_sense(struct nvm_dev *dev, struct ppa_addr ppa) 825{ 826 struct nvm_rq rqd = { NULL }; 827 struct bio bio; 828 struct bio_vec bio_vec; 829 struct page *page; 830 int ret; 831 832 page = alloc_page(GFP_KERNEL); 833 if (!page) 834 return -ENOMEM; 835 836 bio_init(&bio, &bio_vec, 1); 837 bio_add_page(&bio, page, PAGE_SIZE, 0); 838 bio_set_op_attrs(&bio, REQ_OP_READ, 0); 839 840 rqd.bio = &bio; 841 rqd.opcode = NVM_OP_PREAD; 842 rqd.is_seq = 1; 843 rqd.nr_ppas = 1; 844 rqd.ppa_addr = generic_to_dev_addr(dev, ppa); 845 846 ret = nvm_submit_io_sync_raw(dev, &rqd); 847 __free_page(page); 848 if (ret) 849 return ret; 850 851 return rqd.error; 852} 853 854/* 855 * Scans a 1.2 chunk first and last page to determine if its state. 856 * If the chunk is found to be open, also scan it to update the write 857 * pointer. 858 */ 859static int nvm_bb_chunk_scan(struct nvm_dev *dev, struct ppa_addr ppa, 860 struct nvm_chk_meta *meta) 861{ 862 struct nvm_geo *geo = &dev->geo; 863 int ret, pg, pl; 864 865 /* sense first page */ 866 ret = nvm_bb_chunk_sense(dev, ppa); 867 if (ret < 0) /* io error */ 868 return ret; 869 else if (ret == 0) /* valid data */ 870 meta->state = NVM_CHK_ST_OPEN; 871 else if (ret > 0) { 872 /* 873 * If empty page, the chunk is free, else it is an 874 * actual io error. In that case, mark it offline. 875 */ 876 switch (ret) { 877 case NVM_RSP_ERR_EMPTYPAGE: 878 meta->state = NVM_CHK_ST_FREE; 879 return 0; 880 case NVM_RSP_ERR_FAILCRC: 881 case NVM_RSP_ERR_FAILECC: 882 case NVM_RSP_WARN_HIGHECC: 883 meta->state = NVM_CHK_ST_OPEN; 884 goto scan; 885 default: 886 return -ret; /* other io error */ 887 } 888 } 889 890 /* sense last page */ 891 ppa.g.pg = geo->num_pg - 1; 892 ppa.g.pl = geo->num_pln - 1; 893 894 ret = nvm_bb_chunk_sense(dev, ppa); 895 if (ret < 0) /* io error */ 896 return ret; 897 else if (ret == 0) { /* Chunk fully written */ 898 meta->state = NVM_CHK_ST_CLOSED; 899 meta->wp = geo->clba; 900 return 0; 901 } else if (ret > 0) { 902 switch (ret) { 903 case NVM_RSP_ERR_EMPTYPAGE: 904 case NVM_RSP_ERR_FAILCRC: 905 case NVM_RSP_ERR_FAILECC: 906 case NVM_RSP_WARN_HIGHECC: 907 meta->state = NVM_CHK_ST_OPEN; 908 break; 909 default: 910 return -ret; /* other io error */ 911 } 912 } 913 914scan: 915 /* 916 * chunk is open, we scan sequentially to update the write pointer. 917 * We make the assumption that targets write data across all planes 918 * before moving to the next page. 919 */ 920 for (pg = 0; pg < geo->num_pg; pg++) { 921 for (pl = 0; pl < geo->num_pln; pl++) { 922 ppa.g.pg = pg; 923 ppa.g.pl = pl; 924 925 ret = nvm_bb_chunk_sense(dev, ppa); 926 if (ret < 0) /* io error */ 927 return ret; 928 else if (ret == 0) { 929 meta->wp += geo->ws_min; 930 } else if (ret > 0) { 931 switch (ret) { 932 case NVM_RSP_ERR_EMPTYPAGE: 933 return 0; 934 case NVM_RSP_ERR_FAILCRC: 935 case NVM_RSP_ERR_FAILECC: 936 case NVM_RSP_WARN_HIGHECC: 937 meta->wp += geo->ws_min; 938 break; 939 default: 940 return -ret; /* other io error */ 941 } 942 } 943 } 944 } 945 946 return 0; 947} 948 949/* 950 * folds a bad block list from its plane representation to its 951 * chunk representation. 952 * 953 * If any of the planes status are bad or grown bad, the chunk is marked 954 * offline. If not bad, the first plane state acts as the chunk state. 955 */ 956static int nvm_bb_to_chunk(struct nvm_dev *dev, struct ppa_addr ppa, 957 u8 *blks, int nr_blks, struct nvm_chk_meta *meta) 958{ 959 struct nvm_geo *geo = &dev->geo; 960 int ret, blk, pl, offset, blktype; 961 962 for (blk = 0; blk < geo->num_chk; blk++) { 963 offset = blk * geo->pln_mode; 964 blktype = blks[offset]; 965 966 for (pl = 0; pl < geo->pln_mode; pl++) { 967 if (blks[offset + pl] & 968 (NVM_BLK_T_BAD|NVM_BLK_T_GRWN_BAD)) { 969 blktype = blks[offset + pl]; 970 break; 971 } 972 } 973 974 ppa.g.blk = blk; 975 976 meta->wp = 0; 977 meta->type = NVM_CHK_TP_W_SEQ; 978 meta->wi = 0; 979 meta->slba = generic_to_dev_addr(dev, ppa).ppa; 980 meta->cnlb = dev->geo.clba; 981 982 if (blktype == NVM_BLK_T_FREE) { 983 ret = nvm_bb_chunk_scan(dev, ppa, meta); 984 if (ret) 985 return ret; 986 } else { 987 meta->state = NVM_CHK_ST_OFFLINE; 988 } 989 990 meta++; 991 } 992 993 return 0; 994} 995 996static int nvm_get_bb_meta(struct nvm_dev *dev, sector_t slba, 997 int nchks, struct nvm_chk_meta *meta) 998{ 999 struct nvm_geo *geo = &dev->geo; 1000 struct ppa_addr ppa; 1001 u8 *blks; 1002 int ch, lun, nr_blks; 1003 int ret = 0; 1004 1005 ppa.ppa = slba; 1006 ppa = dev_to_generic_addr(dev, ppa); 1007 1008 if (ppa.g.blk != 0) 1009 return -EINVAL; 1010 1011 if ((nchks % geo->num_chk) != 0) 1012 return -EINVAL; 1013 1014 nr_blks = geo->num_chk * geo->pln_mode; 1015 1016 blks = kmalloc(nr_blks, GFP_KERNEL); 1017 if (!blks) 1018 return -ENOMEM; 1019 1020 for (ch = ppa.g.ch; ch < geo->num_ch; ch++) { 1021 for (lun = ppa.g.lun; lun < geo->num_lun; lun++) { 1022 struct ppa_addr ppa_gen, ppa_dev; 1023 1024 if (!nchks) 1025 goto done; 1026 1027 ppa_gen.ppa = 0; 1028 ppa_gen.g.ch = ch; 1029 ppa_gen.g.lun = lun; 1030 ppa_dev = generic_to_dev_addr(dev, ppa_gen); 1031 1032 ret = dev->ops->get_bb_tbl(dev, ppa_dev, blks); 1033 if (ret) 1034 goto done; 1035 1036 ret = nvm_bb_to_chunk(dev, ppa_gen, blks, nr_blks, 1037 meta); 1038 if (ret) 1039 goto done; 1040 1041 meta += geo->num_chk; 1042 nchks -= geo->num_chk; 1043 } 1044 } 1045done: 1046 kfree(blks); 1047 return ret; 1048} 1049 1050int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr ppa, 1051 int nchks, struct nvm_chk_meta *meta) 1052{ 1053 struct nvm_dev *dev = tgt_dev->parent; 1054 1055 nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1); 1056 1057 if (dev->geo.version == NVM_OCSSD_SPEC_12) 1058 return nvm_get_bb_meta(dev, (sector_t)ppa.ppa, nchks, meta); 1059 1060 return dev->ops->get_chk_meta(dev, (sector_t)ppa.ppa, nchks, meta); 1061} 1062EXPORT_SYMBOL_GPL(nvm_get_chunk_meta); 1063 1064int nvm_set_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, 1065 int nr_ppas, int type) 1066{ 1067 struct nvm_dev *dev = tgt_dev->parent; 1068 struct nvm_rq rqd; 1069 int ret; 1070 1071 if (dev->geo.version == NVM_OCSSD_SPEC_20) 1072 return 0; 1073 1074 if (nr_ppas > NVM_MAX_VLBA) { 1075 pr_err("unable to update all blocks atomically\n"); 1076 return -EINVAL; 1077 } 1078 1079 memset(&rqd, 0, sizeof(struct nvm_rq)); 1080 1081 nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas); 1082 nvm_rq_tgt_to_dev(tgt_dev, &rqd); 1083 1084 ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type); 1085 nvm_free_rqd_ppalist(tgt_dev, &rqd); 1086 if (ret) 1087 return -EINVAL; 1088 1089 return 0; 1090} 1091EXPORT_SYMBOL_GPL(nvm_set_chunk_meta); 1092 1093static int nvm_core_init(struct nvm_dev *dev) 1094{ 1095 struct nvm_geo *geo = &dev->geo; 1096 int ret; 1097 1098 dev->lun_map = kcalloc(BITS_TO_LONGS(geo->all_luns), 1099 sizeof(unsigned long), GFP_KERNEL); 1100 if (!dev->lun_map) 1101 return -ENOMEM; 1102 1103 INIT_LIST_HEAD(&dev->area_list); 1104 INIT_LIST_HEAD(&dev->targets); 1105 mutex_init(&dev->mlock); 1106 spin_lock_init(&dev->lock); 1107 1108 ret = nvm_register_map(dev); 1109 if (ret) 1110 goto err_fmtype; 1111 1112 return 0; 1113err_fmtype: 1114 kfree(dev->lun_map); 1115 return ret; 1116} 1117 1118static void nvm_free(struct kref *ref) 1119{ 1120 struct nvm_dev *dev = container_of(ref, struct nvm_dev, ref); 1121 1122 if (dev->dma_pool) 1123 dev->ops->destroy_dma_pool(dev->dma_pool); 1124 1125 if (dev->rmap) 1126 nvm_unregister_map(dev); 1127 1128 kfree(dev->lun_map); 1129 kfree(dev); 1130} 1131 1132static int nvm_init(struct nvm_dev *dev) 1133{ 1134 struct nvm_geo *geo = &dev->geo; 1135 int ret = -EINVAL; 1136 1137 if (dev->ops->identity(dev)) { 1138 pr_err("device could not be identified\n"); 1139 goto err; 1140 } 1141 1142 pr_debug("ver:%u.%u nvm_vendor:%x\n", geo->major_ver_id, 1143 geo->minor_ver_id, geo->vmnt); 1144 1145 ret = nvm_core_init(dev); 1146 if (ret) { 1147 pr_err("could not initialize core structures.\n"); 1148 goto err; 1149 } 1150 1151 pr_info("registered %s [%u/%u/%u/%u/%u]\n", 1152 dev->name, dev->geo.ws_min, dev->geo.ws_opt, 1153 dev->geo.num_chk, dev->geo.all_luns, 1154 dev->geo.num_ch); 1155 return 0; 1156err: 1157 pr_err("failed to initialize nvm\n"); 1158 return ret; 1159} 1160 1161struct nvm_dev *nvm_alloc_dev(int node) 1162{ 1163 struct nvm_dev *dev; 1164 1165 dev = kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node); 1166 if (dev) 1167 kref_init(&dev->ref); 1168 1169 return dev; 1170} 1171EXPORT_SYMBOL(nvm_alloc_dev); 1172 1173int nvm_register(struct nvm_dev *dev) 1174{ 1175 int ret, exp_pool_size; 1176 1177 if (!dev->q || !dev->ops) { 1178 kref_put(&dev->ref, nvm_free); 1179 return -EINVAL; 1180 } 1181 1182 ret = nvm_init(dev); 1183 if (ret) { 1184 kref_put(&dev->ref, nvm_free); 1185 return ret; 1186 } 1187 1188 exp_pool_size = max_t(int, PAGE_SIZE, 1189 (NVM_MAX_VLBA * (sizeof(u64) + dev->geo.sos))); 1190 exp_pool_size = round_up(exp_pool_size, PAGE_SIZE); 1191 1192 dev->dma_pool = dev->ops->create_dma_pool(dev, "ppalist", 1193 exp_pool_size); 1194 if (!dev->dma_pool) { 1195 pr_err("could not create dma pool\n"); 1196 kref_put(&dev->ref, nvm_free); 1197 return -ENOMEM; 1198 } 1199 1200 /* register device with a supported media manager */ 1201 down_write(&nvm_lock); 1202 list_add(&dev->devices, &nvm_devices); 1203 up_write(&nvm_lock); 1204 1205 return 0; 1206} 1207EXPORT_SYMBOL(nvm_register); 1208 1209void nvm_unregister(struct nvm_dev *dev) 1210{ 1211 struct nvm_target *t, *tmp; 1212 1213 mutex_lock(&dev->mlock); 1214 list_for_each_entry_safe(t, tmp, &dev->targets, list) { 1215 if (t->dev->parent != dev) 1216 continue; 1217 __nvm_remove_target(t, false); 1218 kref_put(&dev->ref, nvm_free); 1219 } 1220 mutex_unlock(&dev->mlock); 1221 1222 down_write(&nvm_lock); 1223 list_del(&dev->devices); 1224 up_write(&nvm_lock); 1225 1226 kref_put(&dev->ref, nvm_free); 1227} 1228EXPORT_SYMBOL(nvm_unregister); 1229 1230static int __nvm_configure_create(struct nvm_ioctl_create *create) 1231{ 1232 struct nvm_dev *dev; 1233 int ret; 1234 1235 down_write(&nvm_lock); 1236 dev = nvm_find_nvm_dev(create->dev); 1237 up_write(&nvm_lock); 1238 1239 if (!dev) { 1240 pr_err("device not found\n"); 1241 return -EINVAL; 1242 } 1243 1244 kref_get(&dev->ref); 1245 ret = nvm_create_tgt(dev, create); 1246 if (ret) 1247 kref_put(&dev->ref, nvm_free); 1248 1249 return ret; 1250} 1251 1252static long nvm_ioctl_info(struct file *file, void __user *arg) 1253{ 1254 struct nvm_ioctl_info *info; 1255 struct nvm_tgt_type *tt; 1256 int tgt_iter = 0; 1257 1258 info = memdup_user(arg, sizeof(struct nvm_ioctl_info)); 1259 if (IS_ERR(info)) 1260 return -EFAULT; 1261 1262 info->version[0] = NVM_VERSION_MAJOR; 1263 info->version[1] = NVM_VERSION_MINOR; 1264 info->version[2] = NVM_VERSION_PATCH; 1265 1266 down_write(&nvm_tgtt_lock); 1267 list_for_each_entry(tt, &nvm_tgt_types, list) { 1268 struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter]; 1269 1270 tgt->version[0] = tt->version[0]; 1271 tgt->version[1] = tt->version[1]; 1272 tgt->version[2] = tt->version[2]; 1273 strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX); 1274 1275 tgt_iter++; 1276 } 1277 1278 info->tgtsize = tgt_iter; 1279 up_write(&nvm_tgtt_lock); 1280 1281 if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) { 1282 kfree(info); 1283 return -EFAULT; 1284 } 1285 1286 kfree(info); 1287 return 0; 1288} 1289 1290static long nvm_ioctl_get_devices(struct file *file, void __user *arg) 1291{ 1292 struct nvm_ioctl_get_devices *devices; 1293 struct nvm_dev *dev; 1294 int i = 0; 1295 1296 devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL); 1297 if (!devices) 1298 return -ENOMEM; 1299 1300 down_write(&nvm_lock); 1301 list_for_each_entry(dev, &nvm_devices, devices) { 1302 struct nvm_ioctl_device_info *info = &devices->info[i]; 1303 1304 strlcpy(info->devname, dev->name, sizeof(info->devname)); 1305 1306 /* kept for compatibility */ 1307 info->bmversion[0] = 1; 1308 info->bmversion[1] = 0; 1309 info->bmversion[2] = 0; 1310 strlcpy(info->bmname, "gennvm", sizeof(info->bmname)); 1311 i++; 1312 1313 if (i >= ARRAY_SIZE(devices->info)) { 1314 pr_err("max %zd devices can be reported.\n", 1315 ARRAY_SIZE(devices->info)); 1316 break; 1317 } 1318 } 1319 up_write(&nvm_lock); 1320 1321 devices->nr_devices = i; 1322 1323 if (copy_to_user(arg, devices, 1324 sizeof(struct nvm_ioctl_get_devices))) { 1325 kfree(devices); 1326 return -EFAULT; 1327 } 1328 1329 kfree(devices); 1330 return 0; 1331} 1332 1333static long nvm_ioctl_dev_create(struct file *file, void __user *arg) 1334{ 1335 struct nvm_ioctl_create create; 1336 1337 if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create))) 1338 return -EFAULT; 1339 1340 if (create.conf.type == NVM_CONFIG_TYPE_EXTENDED && 1341 create.conf.e.rsv != 0) { 1342 pr_err("reserved config field in use\n"); 1343 return -EINVAL; 1344 } 1345 1346 create.dev[DISK_NAME_LEN - 1] = '\0'; 1347 create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0'; 1348 create.tgtname[DISK_NAME_LEN - 1] = '\0'; 1349 1350 if (create.flags != 0) { 1351 __u32 flags = create.flags; 1352 1353 /* Check for valid flags */ 1354 if (flags & NVM_TARGET_FACTORY) 1355 flags &= ~NVM_TARGET_FACTORY; 1356 1357 if (flags) { 1358 pr_err("flag not supported\n"); 1359 return -EINVAL; 1360 } 1361 } 1362 1363 return __nvm_configure_create(&create); 1364} 1365 1366static long nvm_ioctl_dev_remove(struct file *file, void __user *arg) 1367{ 1368 struct nvm_ioctl_remove remove; 1369 1370 if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove))) 1371 return -EFAULT; 1372 1373 remove.tgtname[DISK_NAME_LEN - 1] = '\0'; 1374 1375 if (remove.flags != 0) { 1376 pr_err("no flags supported\n"); 1377 return -EINVAL; 1378 } 1379 1380 return nvm_remove_tgt(&remove); 1381} 1382 1383/* kept for compatibility reasons */ 1384static long nvm_ioctl_dev_init(struct file *file, void __user *arg) 1385{ 1386 struct nvm_ioctl_dev_init init; 1387 1388 if (copy_from_user(&init, arg, sizeof(struct nvm_ioctl_dev_init))) 1389 return -EFAULT; 1390 1391 if (init.flags != 0) { 1392 pr_err("no flags supported\n"); 1393 return -EINVAL; 1394 } 1395 1396 return 0; 1397} 1398 1399/* Kept for compatibility reasons */ 1400static long nvm_ioctl_dev_factory(struct file *file, void __user *arg) 1401{ 1402 struct nvm_ioctl_dev_factory fact; 1403 1404 if (copy_from_user(&fact, arg, sizeof(struct nvm_ioctl_dev_factory))) 1405 return -EFAULT; 1406 1407 fact.dev[DISK_NAME_LEN - 1] = '\0'; 1408 1409 if (fact.flags & ~(NVM_FACTORY_NR_BITS - 1)) 1410 return -EINVAL; 1411 1412 return 0; 1413} 1414 1415static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg) 1416{ 1417 void __user *argp = (void __user *)arg; 1418 1419 if (!capable(CAP_SYS_ADMIN)) 1420 return -EPERM; 1421 1422 switch (cmd) { 1423 case NVM_INFO: 1424 return nvm_ioctl_info(file, argp); 1425 case NVM_GET_DEVICES: 1426 return nvm_ioctl_get_devices(file, argp); 1427 case NVM_DEV_CREATE: 1428 return nvm_ioctl_dev_create(file, argp); 1429 case NVM_DEV_REMOVE: 1430 return nvm_ioctl_dev_remove(file, argp); 1431 case NVM_DEV_INIT: 1432 return nvm_ioctl_dev_init(file, argp); 1433 case NVM_DEV_FACTORY: 1434 return nvm_ioctl_dev_factory(file, argp); 1435 } 1436 return 0; 1437} 1438 1439static const struct file_operations _ctl_fops = { 1440 .open = nonseekable_open, 1441 .unlocked_ioctl = nvm_ctl_ioctl, 1442 .owner = THIS_MODULE, 1443 .llseek = noop_llseek, 1444}; 1445 1446static struct miscdevice _nvm_misc = { 1447 .minor = MISC_DYNAMIC_MINOR, 1448 .name = "lightnvm", 1449 .nodename = "lightnvm/control", 1450 .fops = &_ctl_fops, 1451}; 1452builtin_misc_device(_nvm_misc); 1453