kernel/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 struct nvme_nvm_id_group {
 150         __u8                    mtype;
 151         __u8                    fmtype;
 152         __le16                  res16;
 153         __u8                    num_ch;
 154         __u8                    num_lun;
 155         __u8                    num_pln;
 156         __u8                    rsvd1;
 157         __le16                  num_blk;
 158         __le16                  num_pg;
 159         __le16                  fpg_sz;
 160         __le16                  csecs;
 161         __le16                  sos;
 162         __le16                  rsvd2;
 163         __le32                  trdt;
 164         __le32                  trdm;
 165         __le32                  tprt;
 166         __le32                  tprm;
 167         __le32                  tbet;
 168         __le32                  tbem;
 169         __le32                  mpos;
 170         __le32                  mccap;
 171         __le16                  cpar;
 172         __u8                    reserved[906];
 173 } __packed;
 174
 175 struct nvme_nvm_addr_format {
 176         __u8                    ch_offset;
 177         __u8                    ch_len;
 178         __u8                    lun_offset;
 179         __u8                    lun_len;
 180         __u8                    pln_offset;
 181         __u8                    pln_len;
 182         __u8                    blk_offset;
 183         __u8                    blk_len;
 184         __u8                    pg_offset;
 185         __u8                    pg_len;
 186         __u8                    sect_offset;
 187         __u8                    sect_len;
 188         __u8                    res[4];
 189 } __packed;
 190
 191 struct nvme_nvm_id {
 192         __u8                    ver_id;
 193         __u8                    vmnt;
 194         __u8                    cgrps;
 195         __u8                    res;
 196         __le32                  cap;
 197         __le32                  dom;
 198         struct nvme_nvm_addr_format ppaf;
 199         __u8                    resv[228];
 200         struct nvme_nvm_id_group groups[4];
 201 } __packed;
 202
 203 struct nvme_nvm_bb_tbl {
 204         __u8    tblid[4];
 205         __le16  verid;
 206         __le16  revid;
 207         __le32  rvsd1;
 208         __le32  tblks;
 209         __le32  tfact;
 210         __le32  tgrown;
 211         __le32  tdresv;
 212         __le32  thresv;
 213         __le32  rsvd2[8];
 214         __u8    blk[0];
 215 };
 216
 217 /*
 218  * Check we didn't inadvertently grow the command struct
 219  */
 220 static inline void _nvme_nvm_check_size(void)
 221 {
 222         BUILD_BUG_ON(sizeof(struct nvme_nvm_identity) != 64);
 223         BUILD_BUG_ON(sizeof(struct nvme_nvm_hb_rw) != 64);
 224         BUILD_BUG_ON(sizeof(struct nvme_nvm_ph_rw) != 64);
 225         BUILD_BUG_ON(sizeof(struct nvme_nvm_getbbtbl) != 64);
 226         BUILD_BUG_ON(sizeof(struct nvme_nvm_setbbtbl) != 64);
 227         BUILD_BUG_ON(sizeof(struct nvme_nvm_l2ptbl) != 64);
 228         BUILD_BUG_ON(sizeof(struct nvme_nvm_erase_blk) != 64);
 229         BUILD_BUG_ON(sizeof(struct nvme_nvm_id_group) != 960);
 230         BUILD_BUG_ON(sizeof(struct nvme_nvm_addr_format) != 128);
 231         BUILD_BUG_ON(sizeof(struct nvme_nvm_id) != 4096);
 232         BUILD_BUG_ON(sizeof(struct nvme_nvm_bb_tbl) != 512);
 233 }
 234
 235 static int init_grps(struct nvm_id *nvm_id, struct nvme_nvm_id *nvme_nvm_id)
 236 {
 237         struct nvme_nvm_id_group *src;
 238         struct nvm_id_group *dst;
 239         int i, end;
 240
 241         end = min_t(u32, 4, nvm_id->cgrps);
 242
 243         for (i = 0; i < end; i++) {
 244                 src = &nvme_nvm_id->groups[i];
 245                 dst = &nvm_id->groups[i];
 246
 247                 dst->mtype = src->mtype;
 248                 dst->fmtype = src->fmtype;
 249                 dst->num_ch = src->num_ch;
 250                 dst->num_lun = src->num_lun;
 251                 dst->num_pln = src->num_pln;
 252
 253                 dst->num_pg = le16_to_cpu(src->num_pg);
 254                 dst->num_blk = le16_to_cpu(src->num_blk);
 255                 dst->fpg_sz = le16_to_cpu(src->fpg_sz);
 256                 dst->csecs = le16_to_cpu(src->csecs);
 257                 dst->sos = le16_to_cpu(src->sos);
 258
 259                 dst->trdt = le32_to_cpu(src->trdt);
 260                 dst->trdm = le32_to_cpu(src->trdm);
 261                 dst->tprt = le32_to_cpu(src->tprt);
 262                 dst->tprm = le32_to_cpu(src->tprm);
 263                 dst->tbet = le32_to_cpu(src->tbet);
 264                 dst->tbem = le32_to_cpu(src->tbem);
 265                 dst->mpos = le32_to_cpu(src->mpos);
 266                 dst->mccap = le32_to_cpu(src->mccap);
 267
 268                 dst->cpar = le16_to_cpu(src->cpar);
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int nvme_nvm_identity(struct nvm_dev *nvmdev, struct nvm_id *nvm_id)
 275 {
 276         struct nvme_ns *ns = nvmdev->q->queuedata;
 277         struct nvme_dev *dev = ns->dev;
 278         struct nvme_nvm_id *nvme_nvm_id;
 279         struct nvme_nvm_command c = {};
 280         int ret;
 281
 282         c.identity.opcode = nvme_nvm_admin_identity;
 283         c.identity.nsid = cpu_to_le32(ns->ns_id);
 284         c.identity.chnl_off = 0;
 285
 286         nvme_nvm_id = kmalloc(sizeof(struct nvme_nvm_id), GFP_KERNEL);
 287         if (!nvme_nvm_id)
 288                 return -ENOMEM;
 289
 290         ret = nvme_submit_sync_cmd(dev->admin_q, (struct nvme_command *)&c,
 291                                 nvme_nvm_id, sizeof(struct nvme_nvm_id));
 292         if (ret) {
 293                 ret = -EIO;
 294                 goto out;
 295         }
 296
 297         nvm_id->ver_id = nvme_nvm_id->ver_id;
 298         nvm_id->vmnt = nvme_nvm_id->vmnt;
 299         nvm_id->cgrps = nvme_nvm_id->cgrps;
 300         nvm_id->cap = le32_to_cpu(nvme_nvm_id->cap);
 301         nvm_id->dom = le32_to_cpu(nvme_nvm_id->dom);
 302         memcpy(&nvm_id->ppaf, &nvme_nvm_id->ppaf,
 303                                         sizeof(struct nvme_nvm_addr_format));
 304
 305         ret = init_grps(nvm_id, nvme_nvm_id);
 306 out:
 307         kfree(nvme_nvm_id);
 308         return ret;
 309 }
 310
 311 static int nvme_nvm_get_l2p_tbl(struct nvm_dev *nvmdev, u64 slba, u32 nlb,
 312                                 nvm_l2p_update_fn *update_l2p, void *priv)
 313 {
 314         struct nvme_ns *ns = nvmdev->q->queuedata;
 315         struct nvme_dev *dev = ns->dev;
 316         struct nvme_nvm_command c = {};
 317         u32 len = queue_max_hw_sectors(dev->admin_q) << 9;
 318         u32 nlb_pr_rq = len / sizeof(u64);
 319         u64 cmd_slba = slba;
 320         void *entries;
 321         int ret = 0;
 322
 323         c.l2p.opcode = nvme_nvm_admin_get_l2p_tbl;
 324         c.l2p.nsid = cpu_to_le32(ns->ns_id);
 325         entries = kmalloc(len, GFP_KERNEL);
 326         if (!entries)
 327                 return -ENOMEM;
 328
 329         while (nlb) {
 330                 u32 cmd_nlb = min(nlb_pr_rq, nlb);
 331
 332                 c.l2p.slba = cpu_to_le64(cmd_slba);
 333                 c.l2p.nlb = cpu_to_le32(cmd_nlb);
 334
 335                 ret = nvme_submit_sync_cmd(dev->admin_q,
 336                                 (struct nvme_command *)&c, entries, len);
 337                 if (ret) {
 338                         dev_err(dev->dev, "L2P table transfer failed (%d)\n",
 339                                                                         ret);
 340                         ret = -EIO;
 341                         goto out;
 342                 }
 343
 344                 if (update_l2p(cmd_slba, cmd_nlb, entries, priv)) {
 345                         ret = -EINTR;
 346                         goto out;
 347                 }
 348
 349                 cmd_slba += cmd_nlb;
 350                 nlb -= cmd_nlb;
 351         }
 352
 353 out:
 354         kfree(entries);
 355         return ret;
 356 }
 357
 358 static int nvme_nvm_get_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr ppa,
 359                                 int nr_blocks, nvm_bb_update_fn *update_bbtbl,
 360                                 void *priv)
 361 {
 362         struct request_queue *q = nvmdev->q;
 363         struct nvme_ns *ns = q->queuedata;
 364         struct nvme_dev *dev = ns->dev;
 365         struct nvme_nvm_command c = {};
 366         struct nvme_nvm_bb_tbl *bb_tbl;
 367         int tblsz = sizeof(struct nvme_nvm_bb_tbl) + nr_blocks;
 368         int ret = 0;
 369
 370         c.get_bb.opcode = nvme_nvm_admin_get_bb_tbl;
 371         c.get_bb.nsid = cpu_to_le32(ns->ns_id);
 372         c.get_bb.spba = cpu_to_le64(ppa.ppa);
 373
 374         bb_tbl = kzalloc(tblsz, GFP_KERNEL);
 375         if (!bb_tbl)
 376                 return -ENOMEM;
 377
 378         ret = nvme_submit_sync_cmd(dev->admin_q, (struct nvme_command *)&c,
 379                                                                 bb_tbl, tblsz);
 380         if (ret) {
 381                 dev_err(dev->dev, "get bad block table failed (%d)\n", ret);
 382                 ret = -EIO;
 383                 goto out;
 384         }
 385
 386         if (bb_tbl->tblid[0] != 'B' || bb_tbl->tblid[1] != 'B' ||
 387                 bb_tbl->tblid[2] != 'L' || bb_tbl->tblid[3] != 'T') {
 388                 dev_err(dev->dev, "bbt format mismatch\n");
 389                 ret = -EINVAL;
 390                 goto out;
 391         }
 392
 393         if (le16_to_cpu(bb_tbl->verid) != 1) {
 394                 ret = -EINVAL;
 395                 dev_err(dev->dev, "bbt version not supported\n");
 396                 goto out;
 397         }
 398
 399         if (le32_to_cpu(bb_tbl->tblks) != nr_blocks) {
 400                 ret = -EINVAL;
 401                 dev_err(dev->dev, "bbt unsuspected blocks returned (%u!=%u)",
 402                                         le32_to_cpu(bb_tbl->tblks), nr_blocks);
 403                 goto out;
 404         }
 405
 406         ppa = dev_to_generic_addr(nvmdev, ppa);
 407         ret = update_bbtbl(ppa, nr_blocks, bb_tbl->blk, priv);
 408         if (ret) {
 409                 ret = -EINTR;
 410                 goto out;
 411         }
 412
 413 out:
 414         kfree(bb_tbl);
 415         return ret;
 416 }
 417
 418 static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct nvm_rq *rqd,
 419                                                                 int type)
 420 {
 421         struct nvme_ns *ns = nvmdev->q->queuedata;
 422         struct nvme_dev *dev = ns->dev;
 423         struct nvme_nvm_command c = {};
 424         int ret = 0;
 425
 426         c.set_bb.opcode = nvme_nvm_admin_set_bb_tbl;
 427         c.set_bb.nsid = cpu_to_le32(ns->ns_id);
 428         c.set_bb.spba = cpu_to_le64(rqd->ppa_addr.ppa);
 429         c.set_bb.nlb = cpu_to_le16(rqd->nr_pages - 1);
 430         c.set_bb.value = type;
 431
 432         ret = nvme_submit_sync_cmd(dev->admin_q, (struct nvme_command *)&c,
 433                                                                 NULL, 0);
 434         if (ret)
 435                 dev_err(dev->dev, "set bad block table failed (%d)\n", ret);
 436         return ret;
 437 }
 438
 439 static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd,
 440                                 struct nvme_ns *ns, struct nvme_nvm_command *c)
 441 {
 442         c->ph_rw.opcode = rqd->opcode;
 443         c->ph_rw.nsid = cpu_to_le32(ns->ns_id);
 444         c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa);
 445         c->ph_rw.control = cpu_to_le16(rqd->flags);
 446         c->ph_rw.length = cpu_to_le16(rqd->nr_pages - 1);
 447
 448         if (rqd->opcode == NVM_OP_HBWRITE || rqd->opcode == NVM_OP_HBREAD)
 449                 c->hb_rw.slba = cpu_to_le64(nvme_block_nr(ns,
 450                                                 rqd->bio->bi_iter.bi_sector));
 451 }
 452
 453 static void nvme_nvm_end_io(struct request *rq, int error)
 454 {
 455         struct nvm_rq *rqd = rq->end_io_data;
 456         struct nvm_dev *dev = rqd->dev;
 457
 458         if (dev->mt && dev->mt->end_io(rqd, error))
 459                 pr_err("nvme: err status: %x result: %lx\n",
 460                                 rq->errors, (unsigned long)rq->special);
 461
 462         kfree(rq->cmd);
 463         blk_mq_free_request(rq);
 464 }
 465
 466 static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
 467 {
 468         struct request_queue *q = dev->q;
 469         struct nvme_ns *ns = q->queuedata;
 470         struct request *rq;
 471         struct bio *bio = rqd->bio;
 472         struct nvme_nvm_command *cmd;
 473
 474         rq = blk_mq_alloc_request(q, bio_rw(bio), GFP_KERNEL, 0);
 475         if (IS_ERR(rq))
 476                 return -ENOMEM;
 477
 478         cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
 479         if (!cmd) {
 480                 blk_mq_free_request(rq);
 481                 return -ENOMEM;
 482         }
 483
 484         rq->cmd_type = REQ_TYPE_DRV_PRIV;
 485         rq->ioprio = bio_prio(bio);
 486
 487         if (bio_has_data(bio))
 488                 rq->nr_phys_segments = bio_phys_segments(q, bio);
 489
 490         rq->__data_len = bio->bi_iter.bi_size;
 491         rq->bio = rq->biotail = bio;
 492
 493         nvme_nvm_rqtocmd(rq, rqd, ns, cmd);
 494
 495         rq->cmd = (unsigned char *)cmd;
 496         rq->cmd_len = sizeof(struct nvme_nvm_command);
 497         rq->special = (void *)0;
 498
 499         rq->end_io_data = rqd;
 500
 501         blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io);
 502
 503         return 0;
 504 }
 505
 506 static int nvme_nvm_erase_block(struct nvm_dev *dev, struct nvm_rq *rqd)
 507 {
 508         struct request_queue *q = dev->q;
 509         struct nvme_ns *ns = q->queuedata;
 510         struct nvme_nvm_command c = {};
 511
 512         c.erase.opcode = NVM_OP_ERASE;
 513         c.erase.nsid = cpu_to_le32(ns->ns_id);
 514         c.erase.spba = cpu_to_le64(rqd->ppa_addr.ppa);
 515         c.erase.length = cpu_to_le16(rqd->nr_pages - 1);
 516
 517         return nvme_submit_sync_cmd(q, (struct nvme_command *)&c, NULL, 0);
 518 }
 519
 520 static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name)
 521 {
 522         struct nvme_ns *ns = nvmdev->q->queuedata;
 523         struct nvme_dev *dev = ns->dev;
 524
 525         return dma_pool_create(name, dev->dev, PAGE_SIZE, PAGE_SIZE, 0);
 526 }
 527
 528 static void nvme_nvm_destroy_dma_pool(void *pool)
 529 {
 530         struct dma_pool *dma_pool = pool;
 531
 532         dma_pool_destroy(dma_pool);
 533 }
 534
 535 static void *nvme_nvm_dev_dma_alloc(struct nvm_dev *dev, void *pool,
 536                                     gfp_t mem_flags, dma_addr_t *dma_handler)
 537 {
 538         return dma_pool_alloc(pool, mem_flags, dma_handler);
 539 }
 540
 541 static void nvme_nvm_dev_dma_free(void *pool, void *ppa_list,
 542                                                         dma_addr_t dma_handler)
 543 {
 544         dma_pool_free(pool, ppa_list, dma_handler);
 545 }
 546
 547 static struct nvm_dev_ops nvme_nvm_dev_ops = {
 548         .identity               = nvme_nvm_identity,
 549
 550         .get_l2p_tbl            = nvme_nvm_get_l2p_tbl,
 551
 552         .get_bb_tbl             = nvme_nvm_get_bb_tbl,
 553         .set_bb_tbl             = nvme_nvm_set_bb_tbl,
 554
 555         .submit_io              = nvme_nvm_submit_io,
 556         .erase_block            = nvme_nvm_erase_block,
 557
 558         .create_dma_pool        = nvme_nvm_create_dma_pool,
 559         .destroy_dma_pool       = nvme_nvm_destroy_dma_pool,
 560         .dev_dma_alloc          = nvme_nvm_dev_dma_alloc,
 561         .dev_dma_free           = nvme_nvm_dev_dma_free,
 562
 563         .max_phys_sect          = 64,
 564 };
 565
 566 int nvme_nvm_register(struct request_queue *q, char *disk_name)
 567 {
 568         return nvm_register(q, disk_name, &nvme_nvm_dev_ops);
 569 }
 570
 571 void nvme_nvm_unregister(struct request_queue *q, char *disk_name)
 572 {
 573         nvm_unregister(disk_name);
 574 }
 575
 576 /* move to shared place when used in multiple places. */
 577 #define PCI_VENDOR_ID_CNEX 0x1d1d
 578 #define PCI_DEVICE_ID_CNEX_WL 0x2807
 579 #define PCI_DEVICE_ID_CNEX_QEMU 0x1f1f
 580
 581 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
 582 {
 583         struct nvme_dev *dev = ns->dev;
 584         struct pci_dev *pdev = to_pci_dev(dev->dev);
 585
 586         /* QEMU NVMe simulator - PCI ID + Vendor specific bit */
 587         if (pdev->vendor == PCI_VENDOR_ID_CNEX &&
 588                                 pdev->device == PCI_DEVICE_ID_CNEX_QEMU &&
 589                                                         id->vs[0] == 0x1)
 590                 return 1;
 591
 592         /* CNEX Labs - PCI ID + Vendor specific bit */
 593         if (pdev->vendor == PCI_VENDOR_ID_CNEX &&
 594                                 pdev->device == PCI_DEVICE_ID_CNEX_WL &&
 595                                                         id->vs[0] == 0x1)
 596                 return 1;
 597
 598         return 0;
 599 }