drivers/nvme/host/lightnvm.c

   1 /*
   2  * nvme-lightnvm.c - LightNVM NVMe device
   3  *
   4  * Copyright (C) 2014-2015 IT University of Copenhagen
   5  * Initial release: Matias Bjorling <mb@lightnvm.io>
   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  * You should have received a copy of the GNU General Public License
  17  * along with this program; see the file COPYING.  If not, write to
  18  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
  19  * USA.
  20  *
  21  */
  22
  23 #include "nvme.h"
  24
  25 #include <linux/nvme.h>
  26 #include <linux/bitops.h>
  27 #include <linux/lightnvm.h>
  28 #include <linux/vmalloc.h>
  29
  30 enum nvme_nvm_admin_opcode {
  31         nvme_nvm_admin_identity         = 0xe2,
  32         nvme_nvm_admin_get_l2p_tbl      = 0xea,
  33         nvme_nvm_admin_get_bb_tbl       = 0xf2,
  34         nvme_nvm_admin_set_bb_tbl       = 0xf1,
  35 };
  36
  37 struct nvme_nvm_hb_rw {
  38         __u8                    opcode;
  39         __u8                    flags;
  40         __u16                   command_id;
  41         __le32                  nsid;
  42         __u64                   rsvd2;
  43         __le64                  metadata;
  44         __le64                  prp1;
  45         __le64                  prp2;
  46         __le64                  spba;
  47         __le16                  length;
  48         __le16                  control;
  49         __le32                  dsmgmt;
  50         __le64                  slba;
  51 };
  52
  53 struct nvme_nvm_ph_rw {
  54         __u8                    opcode;
  55         __u8                    flags;
  56         __u16                   command_id;
  57         __le32                  nsid;
  58         __u64                   rsvd2;
  59         __le64                  metadata;
  60         __le64                  prp1;
  61         __le64                  prp2;
  62         __le64                  spba;
  63         __le16                  length;
  64         __le16                  control;
  65         __le32                  dsmgmt;
  66         __le64                  resv;
  67 };
  68
  69 struct nvme_nvm_identity {
  70         __u8                    opcode;
  71         __u8                    flags;
  72         __u16                   command_id;
  73         __le32                  nsid;
  74         __u64                   rsvd[2];
  75         __le64                  prp1;
  76         __le64                  prp2;
  77         __le32                  chnl_off;
  78         __u32                   rsvd11[5];
  79 };
  80
  81 struct nvme_nvm_l2ptbl {
  82         __u8                    opcode;
  83         __u8                    flags;
  84         __u16                   command_id;
  85         __le32                  nsid;
  86         __le32                  cdw2[4];
  87         __le64                  prp1;
  88         __le64                  prp2;
  89         __le64                  slba;
  90         __le32                  nlb;
  91         __le16                  cdw14[6];
  92 };
  93
  94 struct nvme_nvm_getbbtbl {
  95         __u8                    opcode;
  96         __u8                    flags;
  97         __u16                   command_id;
  98         __le32                  nsid;
  99         __u64                   rsvd[2];
 100         __le64                  prp1;
 101         __le64                  prp2;
 102         __le64                  spba;
 103         __u32                   rsvd4[4];
 104 };
 105
 106 struct nvme_nvm_setbbtbl {
 107         __u8                    opcode;
 108         __u8                    flags;
 109         __u16                   command_id;
 110         __le32                  nsid;
 111         __le64                  rsvd[2];
 112         __le64                  prp1;
 113         __le64                  prp2;
 114         __le64                  spba;
 115         __le16                  nlb;
 116         __u8                    value;
 117         __u8                    rsvd3;
 118         __u32                   rsvd4[3];
 119 };
 120
 121 struct nvme_nvm_erase_blk {
 122         __u8                    opcode;
 123         __u8                    flags;
 124         __u16                   command_id;
 125         __le32                  nsid;
 126         __u64                   rsvd[2];
 127         __le64                  prp1;
 128         __le64                  prp2;
 129         __le64                  spba;
 130         __le16                  length;
 131         __le16                  control;
 132         __le32                  dsmgmt;
 133         __le64                  resv;
 134 };
 135
 136 struct nvme_nvm_command {
 137         union {
 138                 struct nvme_common_command common;
 139                 struct nvme_nvm_identity identity;
 140                 struct nvme_nvm_hb_rw hb_rw;
 141                 struct nvme_nvm_ph_rw ph_rw;
 142                 struct nvme_nvm_l2ptbl l2p;
 143                 struct nvme_nvm_getbbtbl get_bb;
 144                 struct nvme_nvm_setbbtbl set_bb;
 145                 struct nvme_nvm_erase_blk erase;
 146         };
 147 };
 148
 149 #define NVME_NVM_LP_MLC_PAIRS 886
 150 struct nvme_nvm_lp_mlc {
 151         __le16                  num_pairs;
 152         __u8                    pairs[NVME_NVM_LP_MLC_PAIRS];
 153 };
 154
 155 struct nvme_nvm_lp_tbl {
 156         __u8                    id[8];
 157         struct nvme_nvm_lp_mlc  mlc;
 158 };
 159
 160 struct nvme_nvm_id_group {
 161         __u8                    mtype;
 162         __u8                    fmtype;
 163         __le16                  res16;
 164         __u8                    num_ch;
 165         __u8                    num_lun;
 166         __u8                    num_pln;
 167         __u8                    rsvd1;
 168         __le16                  num_blk;
 169         __le16                  num_pg;
 170         __le16                  fpg_sz;
 171         __le16                  csecs;
 172         __le16                  sos;
 173         __le16                  rsvd2;
 174         __le32                  trdt;
 175         __le32                  trdm;
 176         __le32                  tprt;
 177         __le32                  tprm;
 178         __le32                  tbet;
 179         __le32                  tbem;
 180         __le32                  mpos;
 181         __le32                  mccap;
 182         __le16                  cpar;
 183         __u8                    reserved[10];
 184         struct nvme_nvm_lp_tbl lptbl;
 185 } __packed;
 186
 187 struct nvme_nvm_addr_format {
 188         __u8                    ch_offset;
 189         __u8                    ch_len;
 190         __u8                    lun_offset;
 191         __u8                    lun_len;
 192         __u8                    pln_offset;
 193         __u8                    pln_len;
 194         __u8                    blk_offset;
 195         __u8                    blk_len;
 196         __u8                    pg_offset;
 197         __u8                    pg_len;
 198         __u8                    sect_offset;
 199         __u8                    sect_len;
 200         __u8                    res[4];
 201 } __packed;
 202
 203 struct nvme_nvm_id {
 204         __u8                    ver_id;
 205         __u8                    vmnt;
 206         __u8                    cgrps;
 207         __u8                    res;
 208         __le32                  cap;
 209         __le32                  dom;
 210         struct nvme_nvm_addr_format ppaf;
 211         __u8                    resv[228];
 212         struct nvme_nvm_id_group groups[4];
 213 } __packed;
 214
 215 struct nvme_nvm_bb_tbl {
 216         __u8    tblid[4];
 217         __le16  verid;
 218         __le16  revid;
 219         __le32  rvsd1;
 220         __le32  tblks;
 221         __le32  tfact;
 222         __le32  tgrown;
 223         __le32  tdresv;
 224         __le32  thresv;
 225         __le32  rsvd2[8];
 226         __u8    blk[0];
 227 };
 228
 229 /*
 230  * Check we didn't inadvertently grow the command struct
 231  */
 232 static inline void _nvme_nvm_check_size(void)
 233 {
 234         BUILD_BUG_ON(sizeof(struct nvme_nvm_identity) != 64);
 235         BUILD_BUG_ON(sizeof(struct nvme_nvm_hb_rw) != 64);
 236         BUILD_BUG_ON(sizeof(struct nvme_nvm_ph_rw) != 64);
 237         BUILD_BUG_ON(sizeof(struct nvme_nvm_getbbtbl) != 64);
 238         BUILD_BUG_ON(sizeof(struct nvme_nvm_setbbtbl) != 64);
 239         BUILD_BUG_ON(sizeof(struct nvme_nvm_l2ptbl) != 64);
 240         BUILD_BUG_ON(sizeof(struct nvme_nvm_erase_blk) != 64);
 241         BUILD_BUG_ON(sizeof(struct nvme_nvm_id_group) != 960);
 242         BUILD_BUG_ON(sizeof(struct nvme_nvm_addr_format) != 128);
 243         BUILD_BUG_ON(sizeof(struct nvme_nvm_id) != 4096);
 244         BUILD_BUG_ON(sizeof(struct nvme_nvm_bb_tbl) != 512);
 245 }
 246
 247 static int init_grps(struct nvm_id *nvm_id, struct nvme_nvm_id *nvme_nvm_id)
 248 {
 249         struct nvme_nvm_id_group *src;
 250         struct nvm_id_group *dst;
 251         int i, end;
 252
 253         end = min_t(u32, 4, nvm_id->cgrps);
 254
 255         for (i = 0; i < end; i++) {
 256                 src = &nvme_nvm_id->groups[i];
 257                 dst = &nvm_id->groups[i];
 258
 259                 dst->mtype = src->mtype;
 260                 dst->fmtype = src->fmtype;
 261                 dst->num_ch = src->num_ch;
 262                 dst->num_lun = src->num_lun;
 263                 dst->num_pln = src->num_pln;
 264
 265                 dst->num_pg = le16_to_cpu(src->num_pg);
 266                 dst->num_blk = le16_to_cpu(src->num_blk);
 267                 dst->fpg_sz = le16_to_cpu(src->fpg_sz);
 268                 dst->csecs = le16_to_cpu(src->csecs);
 269                 dst->sos = le16_to_cpu(src->sos);
 270
 271                 dst->trdt = le32_to_cpu(src->trdt);
 272                 dst->trdm = le32_to_cpu(src->trdm);
 273                 dst->tprt = le32_to_cpu(src->tprt);
 274                 dst->tprm = le32_to_cpu(src->tprm);
 275                 dst->tbet = le32_to_cpu(src->tbet);
 276                 dst->tbem = le32_to_cpu(src->tbem);
 277                 dst->mpos = le32_to_cpu(src->mpos);
 278                 dst->mccap = le32_to_cpu(src->mccap);
 279
 280                 dst->cpar = le16_to_cpu(src->cpar);
 281
 282                 if (dst->fmtype == NVM_ID_FMTYPE_MLC) {
 283                         memcpy(dst->lptbl.id, src->lptbl.id, 8);
 284                         dst->lptbl.mlc.num_pairs =
 285                                         le16_to_cpu(src->lptbl.mlc.num_pairs);
 286
 287                         if (dst->lptbl.mlc.num_pairs > NVME_NVM_LP_MLC_PAIRS) {
 288                                 pr_err("nvm: number of MLC pairs not supported\n");
 289                                 return -EINVAL;
 290                         }
 291
 292                         memcpy(dst->lptbl.mlc.pairs, src->lptbl.mlc.pairs,
 293                                                 dst->lptbl.mlc.num_pairs);
 294                 }
 295         }
 296
 297         return 0;
 298 }
 299
 300 static int nvme_nvm_identity(struct nvm_dev *nvmdev, struct nvm_id *nvm_id)
 301 {
 302         struct nvme_ns *ns = nvmdev->q->queuedata;
 303         struct nvme_nvm_id *nvme_nvm_id;
 304         struct nvme_nvm_command c = {};
 305         int ret;
 306
 307         c.identity.opcode = nvme_nvm_admin_identity;
 308         c.identity.nsid = cpu_to_le32(ns->ns_id);
 309         c.identity.chnl_off = 0;
 310
 311         nvme_nvm_id = kmalloc(sizeof(struct nvme_nvm_id), GFP_KERNEL);
 312         if (!nvme_nvm_id)
 313                 return -ENOMEM;
 314
 315         ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, (struct nvme_command *)&c,
 316                                 nvme_nvm_id, sizeof(struct nvme_nvm_id));
 317         if (ret) {
 318                 ret = -EIO;
 319                 goto out;
 320         }
 321
 322         nvm_id->ver_id = nvme_nvm_id->ver_id;
 323         nvm_id->vmnt = nvme_nvm_id->vmnt;
 324         nvm_id->cgrps = nvme_nvm_id->cgrps;
 325         nvm_id->cap = le32_to_cpu(nvme_nvm_id->cap);
 326         nvm_id->dom = le32_to_cpu(nvme_nvm_id->dom);
 327         memcpy(&nvm_id->ppaf, &nvme_nvm_id->ppaf,
 328                                         sizeof(struct nvme_nvm_addr_format));
 329
 330         ret = init_grps(nvm_id, nvme_nvm_id);
 331 out:
 332         kfree(nvme_nvm_id);
 333         return ret;
 334 }
 335
 336 static int nvme_nvm_get_l2p_tbl(struct nvm_dev *nvmdev, u64 slba, u32 nlb,
 337                                 nvm_l2p_update_fn *update_l2p, void *priv)
 338 {
 339         struct nvme_ns *ns = nvmdev->q->queuedata;
 340         struct nvme_nvm_command c = {};
 341         u32 len = queue_max_hw_sectors(ns->ctrl->admin_q) << 9;
 342         u32 nlb_pr_rq = len / sizeof(u64);
 343         u64 cmd_slba = slba;
 344         void *entries;
 345         int ret = 0;
 346
 347         c.l2p.opcode = nvme_nvm_admin_get_l2p_tbl;
 348         c.l2p.nsid = cpu_to_le32(ns->ns_id);
 349         entries = kmalloc(len, GFP_KERNEL);
 350         if (!entries)
 351                 return -ENOMEM;
 352
 353         while (nlb) {
 354                 u32 cmd_nlb = min(nlb_pr_rq, nlb);
 355
 356                 c.l2p.slba = cpu_to_le64(cmd_slba);
 357                 c.l2p.nlb = cpu_to_le32(cmd_nlb);
 358
 359                 ret = nvme_submit_sync_cmd(ns->ctrl->admin_q,
 360                                 (struct nvme_command *)&c, entries, len);
 361                 if (ret) {
 362                         dev_err(ns->ctrl->device,
 363                                 "L2P table transfer failed (%d)\n", ret);
 364                         ret = -EIO;
 365                         goto out;
 366                 }
 367
 368                 if (update_l2p(cmd_slba, cmd_nlb, entries, priv)) {
 369                         ret = -EINTR;
 370                         goto out;
 371                 }
 372
 373                 cmd_slba += cmd_nlb;
 374                 nlb -= cmd_nlb;
 375         }
 376
 377 out:
 378         kfree(entries);
 379         return ret;
 380 }
 381
 382 static int nvme_nvm_get_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr ppa,
 383                                                                 u8 *blks)
 384 {
 385         struct request_queue *q = nvmdev->q;
 386         struct nvme_ns *ns = q->queuedata;
 387         struct nvme_ctrl *ctrl = ns->ctrl;
 388         struct nvme_nvm_command c = {};
 389         struct nvme_nvm_bb_tbl *bb_tbl;
 390         int nr_blks = nvmdev->blks_per_lun * nvmdev->plane_mode;
 391         int tblsz = sizeof(struct nvme_nvm_bb_tbl) + nr_blks;
 392         int ret = 0;
 393
 394         c.get_bb.opcode = nvme_nvm_admin_get_bb_tbl;
 395         c.get_bb.nsid = cpu_to_le32(ns->ns_id);
 396         c.get_bb.spba = cpu_to_le64(ppa.ppa);
 397
 398         bb_tbl = kzalloc(tblsz, GFP_KERNEL);
 399         if (!bb_tbl)
 400                 return -ENOMEM;
 401
 402         ret = nvme_submit_sync_cmd(ctrl->admin_q, (struct nvme_command *)&c,
 403                                                                 bb_tbl, tblsz);
 404         if (ret) {
 405                 dev_err(ctrl->device, "get bad block table failed (%d)\n", ret);
 406                 ret = -EIO;
 407                 goto out;
 408         }
 409
 410         if (bb_tbl->tblid[0] != 'B' || bb_tbl->tblid[1] != 'B' ||
 411                 bb_tbl->tblid[2] != 'L' || bb_tbl->tblid[3] != 'T') {
 412                 dev_err(ctrl->device, "bbt format mismatch\n");
 413                 ret = -EINVAL;
 414                 goto out;
 415         }
 416
 417         if (le16_to_cpu(bb_tbl->verid) != 1) {
 418                 ret = -EINVAL;
 419                 dev_err(ctrl->device, "bbt version not supported\n");
 420                 goto out;
 421         }
 422
 423         if (le32_to_cpu(bb_tbl->tblks) != nr_blks) {
 424                 ret = -EINVAL;
 425                 dev_err(ctrl->device,
 426                                 "bbt unsuspected blocks returned (%u!=%u)",
 427                                 le32_to_cpu(bb_tbl->tblks), nr_blks);
 428                 goto out;
 429         }
 430
 431         memcpy(blks, bb_tbl->blk, nvmdev->blks_per_lun * nvmdev->plane_mode);
 432 out:
 433         kfree(bb_tbl);
 434         return ret;
 435 }
 436
 437 static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr *ppas,
 438                                                         int nr_ppas, int type)
 439 {
 440         struct nvme_ns *ns = nvmdev->q->queuedata;
 441         struct nvme_nvm_command c = {};
 442         int ret = 0;
 443
 444         c.set_bb.opcode = nvme_nvm_admin_set_bb_tbl;
 445         c.set_bb.nsid = cpu_to_le32(ns->ns_id);
 446         c.set_bb.spba = cpu_to_le64(ppas->ppa);
 447         c.set_bb.nlb = cpu_to_le16(nr_ppas - 1);
 448         c.set_bb.value = type;
 449
 450         ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, (struct nvme_command *)&c,
 451                                                                 NULL, 0);
 452         if (ret)
 453                 dev_err(ns->ctrl->device, "set bad block table failed (%d)\n",
 454                                                                         ret);
 455         return ret;
 456 }
 457
 458 static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd,
 459                                 struct nvme_ns *ns, struct nvme_nvm_command *c)
 460 {
 461         c->ph_rw.opcode = rqd->opcode;
 462         c->ph_rw.nsid = cpu_to_le32(ns->ns_id);
 463         c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa);
 464         c->ph_rw.metadata = cpu_to_le64(rqd->dma_meta_list);
 465         c->ph_rw.control = cpu_to_le16(rqd->flags);
 466         c->ph_rw.length = cpu_to_le16(rqd->nr_ppas - 1);
 467
 468         if (rqd->opcode == NVM_OP_HBWRITE || rqd->opcode == NVM_OP_HBREAD)
 469                 c->hb_rw.slba = cpu_to_le64(nvme_block_nr(ns,
 470                                         rqd->bio->bi_iter.bi_sector));
 471 }
 472
 473 static void nvme_nvm_end_io(struct request *rq, int error)
 474 {
 475         struct nvm_rq *rqd = rq->end_io_data;
 476
 477         rqd->ppa_status = nvme_req(rq)->result.u64;
 478         nvm_end_io(rqd, error);
 479
 480         kfree(rq->cmd);
 481         blk_mq_free_request(rq);
 482 }
 483
 484 static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
 485 {
 486         struct request_queue *q = dev->q;
 487         struct nvme_ns *ns = q->queuedata;
 488         struct request *rq;
 489         struct bio *bio = rqd->bio;
 490         struct nvme_nvm_command *cmd;
 491
 492         cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
 493         if (!cmd)
 494                 return -ENOMEM;
 495
 496         rq = nvme_alloc_request(q, (struct nvme_command *)cmd, 0, NVME_QID_ANY);
 497         if (IS_ERR(rq)) {
 498                 kfree(cmd);
 499                 return -ENOMEM;
 500         }
 501         rq->cmd_flags &= ~REQ_FAILFAST_DRIVER;
 502
 503         rq->ioprio = bio_prio(bio);
 504         if (bio_has_data(bio))
 505                 rq->nr_phys_segments = bio_phys_segments(q, bio);
 506
 507         rq->__data_len = bio->bi_iter.bi_size;
 508         rq->bio = rq->biotail = bio;
 509
 510         nvme_nvm_rqtocmd(rq, rqd, ns, cmd);
 511
 512         rq->end_io_data = rqd;
 513
 514         blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io);
 515
 516         return 0;
 517 }
 518
 519 static int nvme_nvm_erase_block(struct nvm_dev *dev, struct nvm_rq *rqd)
 520 {
 521         struct request_queue *q = dev->q;
 522         struct nvme_ns *ns = q->queuedata;
 523         struct nvme_nvm_command c = {};
 524
 525         c.erase.opcode = NVM_OP_ERASE;
 526         c.erase.nsid = cpu_to_le32(ns->ns_id);
 527         c.erase.spba = cpu_to_le64(rqd->ppa_addr.ppa);
 528         c.erase.length = cpu_to_le16(rqd->nr_ppas - 1);
 529
 530         return nvme_submit_sync_cmd(q, (struct nvme_command *)&c, NULL, 0);
 531 }
 532
 533 static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name)
 534 {
 535         struct nvme_ns *ns = nvmdev->q->queuedata;
 536
 537         return dma_pool_create(name, ns->ctrl->dev, PAGE_SIZE, PAGE_SIZE, 0);
 538 }
 539
 540 static void nvme_nvm_destroy_dma_pool(void *pool)
 541 {
 542         struct dma_pool *dma_pool = pool;
 543
 544         dma_pool_destroy(dma_pool);
 545 }
 546
 547 static void *nvme_nvm_dev_dma_alloc(struct nvm_dev *dev, void *pool,
 548                                     gfp_t mem_flags, dma_addr_t *dma_handler)
 549 {
 550         return dma_pool_alloc(pool, mem_flags, dma_handler);
 551 }
 552
 553 static void nvme_nvm_dev_dma_free(void *pool, void *addr,
 554                                                         dma_addr_t dma_handler)
 555 {
 556         dma_pool_free(pool, addr, dma_handler);
 557 }
 558
 559 static struct nvm_dev_ops nvme_nvm_dev_ops = {
 560         .identity               = nvme_nvm_identity,
 561
 562         .get_l2p_tbl            = nvme_nvm_get_l2p_tbl,
 563
 564         .get_bb_tbl             = nvme_nvm_get_bb_tbl,
 565         .set_bb_tbl             = nvme_nvm_set_bb_tbl,
 566
 567         .submit_io              = nvme_nvm_submit_io,
 568         .erase_block            = nvme_nvm_erase_block,
 569
 570         .create_dma_pool        = nvme_nvm_create_dma_pool,
 571         .destroy_dma_pool       = nvme_nvm_destroy_dma_pool,
 572         .dev_dma_alloc          = nvme_nvm_dev_dma_alloc,
 573         .dev_dma_free           = nvme_nvm_dev_dma_free,
 574
 575         .max_phys_sect          = 64,
 576 };
 577
 578 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node,
 579                       const struct attribute_group *attrs)
 580 {
 581         struct request_queue *q = ns->queue;
 582         struct nvm_dev *dev;
 583         int ret;
 584
 585         dev = nvm_alloc_dev(node);
 586         if (!dev)
 587                 return -ENOMEM;
 588
 589         dev->q = q;
 590         memcpy(dev->name, disk_name, DISK_NAME_LEN);
 591         dev->ops = &nvme_nvm_dev_ops;
 592         dev->parent_dev = ns->ctrl->device;
 593         dev->private_data = ns;
 594         ns->ndev = dev;
 595
 596         ret = nvm_register(dev);
 597
 598         ns->lba_shift = ilog2(dev->sec_size) - 9;
 599
 600         if (sysfs_create_group(&dev->dev.kobj, attrs))
 601                 pr_warn("%s: failed to create sysfs group for identification\n",
 602                         disk_name);
 603         return ret;
 604 }
 605
 606 void nvme_nvm_unregister(struct nvme_ns *ns)
 607 {
 608         nvm_unregister(ns->ndev);
 609 }
 610
 611 /* move to shared place when used in multiple places. */
 612 #define PCI_VENDOR_ID_CNEX 0x1d1d
 613 #define PCI_DEVICE_ID_CNEX_WL 0x2807
 614 #define PCI_DEVICE_ID_CNEX_QEMU 0x1f1f
 615
 616 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
 617 {
 618         struct nvme_ctrl *ctrl = ns->ctrl;
 619         /* XXX: this is poking into PCI structures from generic code! */
 620         struct pci_dev *pdev = to_pci_dev(ctrl->dev);
 621
 622         /* QEMU NVMe simulator - PCI ID + Vendor specific bit */
 623         if (pdev->vendor == PCI_VENDOR_ID_CNEX &&
 624                                 pdev->device == PCI_DEVICE_ID_CNEX_QEMU &&
 625                                                         id->vs[0] == 0x1)
 626                 return 1;
 627
 628         /* CNEX Labs - PCI ID + Vendor specific bit */
 629         if (pdev->vendor == PCI_VENDOR_ID_CNEX &&
 630                                 pdev->device == PCI_DEVICE_ID_CNEX_WL &&
 631                                                         id->vs[0] == 0x1)
 632                 return 1;
 633
 634         return 0;
 635 }