drivers/nvme/target/admin-cmd.c

   1 /*
   2  * NVMe admin command implementation.
   3  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15 #include <linux/module.h>
  16 #include <linux/rculist.h>
  17
  18 #include <generated/utsrelease.h>
  19 #include <asm/unaligned.h>
  20 #include "nvmet.h"
  21
  22 /*
  23  * This helper allows us to clear the AEN based on the RAE bit,
  24  * Please use this helper when processing the log pages which are
  25  * associated with the AEN.
  26  */
  27 static inline void nvmet_clear_aen(struct nvmet_req *req, u32 aen_bit)
  28 {
  29         int rae = le32_to_cpu(req->cmd->common.cdw10[0]) & 1 << 15;
  30
  31         if (!rae)
  32                 clear_bit(aen_bit, &req->sq->ctrl->aen_masked);
  33 }
  34
  35 u32 nvmet_get_log_page_len(struct nvme_command *cmd)
  36 {
  37         u32 len = le16_to_cpu(cmd->get_log_page.numdu);
  38
  39         len <<= 16;
  40         len += le16_to_cpu(cmd->get_log_page.numdl);
  41         /* NUMD is a 0's based value */
  42         len += 1;
  43         len *= sizeof(u32);
  44
  45         return len;
  46 }
  47
  48 static void nvmet_execute_get_log_page_noop(struct nvmet_req *req)
  49 {
  50         nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->data_len));
  51 }
  52
  53 static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
  54                 struct nvme_smart_log *slog)
  55 {
  56         struct nvmet_ns *ns;
  57         u64 host_reads, host_writes, data_units_read, data_units_written;
  58
  59         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid);
  60         if (!ns) {
  61                 pr_err("Could not find namespace id : %d\n",
  62                                 le32_to_cpu(req->cmd->get_log_page.nsid));
  63                 return NVME_SC_INVALID_NS;
  64         }
  65
  66         /* we don't have the right data for file backed ns */
  67         if (!ns->bdev)
  68                 goto out;
  69
  70         host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
  71         data_units_read = part_stat_read(ns->bdev->bd_part, sectors[READ]);
  72         host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
  73         data_units_written = part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
  74
  75         put_unaligned_le64(host_reads, &slog->host_reads[0]);
  76         put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
  77         put_unaligned_le64(host_writes, &slog->host_writes[0]);
  78         put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
  79 out:
  80         nvmet_put_namespace(ns);
  81
  82         return NVME_SC_SUCCESS;
  83 }
  84
  85 static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
  86                 struct nvme_smart_log *slog)
  87 {
  88         u64 host_reads = 0, host_writes = 0;
  89         u64 data_units_read = 0, data_units_written = 0;
  90         struct nvmet_ns *ns;
  91         struct nvmet_ctrl *ctrl;
  92
  93         ctrl = req->sq->ctrl;
  94
  95         rcu_read_lock();
  96         list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
  97                 /* we don't have the right data for file backed ns */
  98                 if (!ns->bdev)
  99                         continue;
 100                 host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
 101                 data_units_read +=
 102                         part_stat_read(ns->bdev->bd_part, sectors[READ]);
 103                 host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]);
 104                 data_units_written +=
 105                         part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
 106
 107         }
 108         rcu_read_unlock();
 109
 110         put_unaligned_le64(host_reads, &slog->host_reads[0]);
 111         put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
 112         put_unaligned_le64(host_writes, &slog->host_writes[0]);
 113         put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
 114
 115         return NVME_SC_SUCCESS;
 116 }
 117
 118 static void nvmet_execute_get_log_page_smart(struct nvmet_req *req)
 119 {
 120         struct nvme_smart_log *log;
 121         u16 status = NVME_SC_INTERNAL;
 122
 123         if (req->data_len != sizeof(*log))
 124                 goto out;
 125
 126         log = kzalloc(sizeof(*log), GFP_KERNEL);
 127         if (!log)
 128                 goto out;
 129
 130         if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL))
 131                 status = nvmet_get_smart_log_all(req, log);
 132         else
 133                 status = nvmet_get_smart_log_nsid(req, log);
 134         if (status)
 135                 goto out_free_log;
 136
 137         status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
 138 out_free_log:
 139         kfree(log);
 140 out:
 141         nvmet_req_complete(req, status);
 142 }
 143
 144 static void nvmet_execute_get_log_cmd_effects_ns(struct nvmet_req *req)
 145 {
 146         u16 status = NVME_SC_INTERNAL;
 147         struct nvme_effects_log *log;
 148
 149         log = kzalloc(sizeof(*log), GFP_KERNEL);
 150         if (!log)
 151                 goto out;
 152
 153         log->acs[nvme_admin_get_log_page]       = cpu_to_le32(1 << 0);
 154         log->acs[nvme_admin_identify]           = cpu_to_le32(1 << 0);
 155         log->acs[nvme_admin_abort_cmd]          = cpu_to_le32(1 << 0);
 156         log->acs[nvme_admin_set_features]       = cpu_to_le32(1 << 0);
 157         log->acs[nvme_admin_get_features]       = cpu_to_le32(1 << 0);
 158         log->acs[nvme_admin_async_event]        = cpu_to_le32(1 << 0);
 159         log->acs[nvme_admin_keep_alive]         = cpu_to_le32(1 << 0);
 160
 161         log->iocs[nvme_cmd_read]                = cpu_to_le32(1 << 0);
 162         log->iocs[nvme_cmd_write]               = cpu_to_le32(1 << 0);
 163         log->iocs[nvme_cmd_flush]               = cpu_to_le32(1 << 0);
 164         log->iocs[nvme_cmd_dsm]                 = cpu_to_le32(1 << 0);
 165         log->iocs[nvme_cmd_write_zeroes]        = cpu_to_le32(1 << 0);
 166
 167         status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
 168
 169         kfree(log);
 170 out:
 171         nvmet_req_complete(req, status);
 172 }
 173
 174 static void nvmet_execute_get_log_changed_ns(struct nvmet_req *req)
 175 {
 176         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 177         u16 status = NVME_SC_INTERNAL;
 178         size_t len;
 179
 180         if (req->data_len != NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32))
 181                 goto out;
 182
 183         mutex_lock(&ctrl->lock);
 184         if (ctrl->nr_changed_ns == U32_MAX)
 185                 len = sizeof(__le32);
 186         else
 187                 len = ctrl->nr_changed_ns * sizeof(__le32);
 188         status = nvmet_copy_to_sgl(req, 0, ctrl->changed_ns_list, len);
 189         if (!status)
 190                 status = nvmet_zero_sgl(req, len, req->data_len - len);
 191         ctrl->nr_changed_ns = 0;
 192         nvmet_clear_aen(req, NVME_AEN_CFG_NS_ATTR);
 193         mutex_unlock(&ctrl->lock);
 194 out:
 195         nvmet_req_complete(req, status);
 196 }
 197
 198 static u32 nvmet_format_ana_group(struct nvmet_req *req, u32 grpid,
 199                 struct nvme_ana_group_desc *desc)
 200 {
 201         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 202         struct nvmet_ns *ns;
 203         u32 count = 0;
 204
 205         if (!(req->cmd->get_log_page.lsp & NVME_ANA_LOG_RGO)) {
 206                 rcu_read_lock();
 207                 list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link)
 208                         if (ns->anagrpid == grpid)
 209                                 desc->nsids[count++] = cpu_to_le32(ns->nsid);
 210                 rcu_read_unlock();
 211         }
 212
 213         desc->grpid = cpu_to_le32(grpid);
 214         desc->nnsids = cpu_to_le32(count);
 215         desc->chgcnt = cpu_to_le64(nvmet_ana_chgcnt);
 216         desc->state = req->port->ana_state[grpid];
 217         memset(desc->rsvd17, 0, sizeof(desc->rsvd17));
 218         return sizeof(struct nvme_ana_group_desc) + count * sizeof(__le32);
 219 }
 220
 221 static void nvmet_execute_get_log_page_ana(struct nvmet_req *req)
 222 {
 223         struct nvme_ana_rsp_hdr hdr = { 0, };
 224         struct nvme_ana_group_desc *desc;
 225         size_t offset = sizeof(struct nvme_ana_rsp_hdr); /* start beyond hdr */
 226         size_t len;
 227         u32 grpid;
 228         u16 ngrps = 0;
 229         u16 status;
 230
 231         status = NVME_SC_INTERNAL;
 232         desc = kmalloc(sizeof(struct nvme_ana_group_desc) +
 233                         NVMET_MAX_NAMESPACES * sizeof(__le32), GFP_KERNEL);
 234         if (!desc)
 235                 goto out;
 236
 237         down_read(&nvmet_ana_sem);
 238         for (grpid = 1; grpid <= NVMET_MAX_ANAGRPS; grpid++) {
 239                 if (!nvmet_ana_group_enabled[grpid])
 240                         continue;
 241                 len = nvmet_format_ana_group(req, grpid, desc);
 242                 status = nvmet_copy_to_sgl(req, offset, desc, len);
 243                 if (status)
 244                         break;
 245                 offset += len;
 246                 ngrps++;
 247         }
 248         for ( ; grpid <= NVMET_MAX_ANAGRPS; grpid++) {
 249                 if (nvmet_ana_group_enabled[grpid])
 250                         ngrps++;
 251         }
 252
 253         hdr.chgcnt = cpu_to_le64(nvmet_ana_chgcnt);
 254         hdr.ngrps = cpu_to_le16(ngrps);
 255         nvmet_clear_aen(req, NVME_AEN_CFG_ANA_CHANGE);
 256         up_read(&nvmet_ana_sem);
 257
 258         kfree(desc);
 259
 260         /* copy the header last once we know the number of groups */
 261         status = nvmet_copy_to_sgl(req, 0, &hdr, sizeof(hdr));
 262 out:
 263         nvmet_req_complete(req, status);
 264 }
 265
 266 static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 267 {
 268         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 269         struct nvme_id_ctrl *id;
 270         u16 status = 0;
 271         const char model[] = "Linux";
 272
 273         id = kzalloc(sizeof(*id), GFP_KERNEL);
 274         if (!id) {
 275                 status = NVME_SC_INTERNAL;
 276                 goto out;
 277         }
 278
 279         /* XXX: figure out how to assign real vendors IDs. */
 280         id->vid = 0;
 281         id->ssvid = 0;
 282
 283         memset(id->sn, ' ', sizeof(id->sn));
 284         bin2hex(id->sn, &ctrl->subsys->serial,
 285                 min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2));
 286         memcpy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1, ' ');
 287         memcpy_and_pad(id->fr, sizeof(id->fr),
 288                        UTS_RELEASE, strlen(UTS_RELEASE), ' ');
 289
 290         id->rab = 6;
 291
 292         /*
 293          * XXX: figure out how we can assign a IEEE OUI, but until then
 294          * the safest is to leave it as zeroes.
 295          */
 296
 297         /* we support multiple ports, multiples hosts and ANA: */
 298         id->cmic = (1 << 0) | (1 << 1) | (1 << 3);
 299
 300         /* no limit on data transfer sizes for now */
 301         id->mdts = 0;
 302         id->cntlid = cpu_to_le16(ctrl->cntlid);
 303         id->ver = cpu_to_le32(ctrl->subsys->ver);
 304
 305         /* XXX: figure out what to do about RTD3R/RTD3 */
 306         id->oaes = cpu_to_le32(NVMET_AEN_CFG_OPTIONAL);
 307         id->ctratt = cpu_to_le32(NVME_CTRL_ATTR_HID_128_BIT |
 308                 NVME_CTRL_ATTR_TBKAS);
 309
 310         id->oacs = 0;
 311
 312         /*
 313          * We don't really have a practical limit on the number of abort
 314          * comands.  But we don't do anything useful for abort either, so
 315          * no point in allowing more abort commands than the spec requires.
 316          */
 317         id->acl = 3;
 318
 319         id->aerl = NVMET_ASYNC_EVENTS - 1;
 320
 321         /* first slot is read-only, only one slot supported */
 322         id->frmw = (1 << 0) | (1 << 1);
 323         id->lpa = (1 << 0) | (1 << 1) | (1 << 2);
 324         id->elpe = NVMET_ERROR_LOG_SLOTS - 1;
 325         id->npss = 0;
 326
 327         /* We support keep-alive timeout in granularity of seconds */
 328         id->kas = cpu_to_le16(NVMET_KAS);
 329
 330         id->sqes = (0x6 << 4) | 0x6;
 331         id->cqes = (0x4 << 4) | 0x4;
 332
 333         /* no enforcement soft-limit for maxcmd - pick arbitrary high value */
 334         id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
 335
 336         id->nn = cpu_to_le32(ctrl->subsys->max_nsid);
 337         id->mnan = cpu_to_le32(NVMET_MAX_NAMESPACES);
 338         id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM |
 339                         NVME_CTRL_ONCS_WRITE_ZEROES);
 340
 341         /* XXX: don't report vwc if the underlying device is write through */
 342         id->vwc = NVME_CTRL_VWC_PRESENT;
 343
 344         /*
 345          * We can't support atomic writes bigger than a LBA without support
 346          * from the backend device.
 347          */
 348         id->awun = 0;
 349         id->awupf = 0;
 350
 351         id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
 352         if (ctrl->ops->has_keyed_sgls)
 353                 id->sgls |= cpu_to_le32(1 << 2);
 354         if (req->port->inline_data_size)
 355                 id->sgls |= cpu_to_le32(1 << 20);
 356
 357         strlcpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));
 358
 359         /* Max command capsule size is sqe + single page of in-capsule data */
 360         id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
 361                                   req->port->inline_data_size) / 16);
 362         /* Max response capsule size is cqe */
 363         id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
 364
 365         id->msdbd = ctrl->ops->msdbd;
 366
 367         id->anacap = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4);
 368         id->anatt = 10; /* random value */
 369         id->anagrpmax = cpu_to_le32(NVMET_MAX_ANAGRPS);
 370         id->nanagrpid = cpu_to_le32(NVMET_MAX_ANAGRPS);
 371
 372         /*
 373          * Meh, we don't really support any power state.  Fake up the same
 374          * values that qemu does.
 375          */
 376         id->psd[0].max_power = cpu_to_le16(0x9c4);
 377         id->psd[0].entry_lat = cpu_to_le32(0x10);
 378         id->psd[0].exit_lat = cpu_to_le32(0x4);
 379
 380         id->nwpc = 1 << 0; /* write protect and no write protect */
 381
 382         status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
 383
 384         kfree(id);
 385 out:
 386         nvmet_req_complete(req, status);
 387 }
 388
 389 static void nvmet_execute_identify_ns(struct nvmet_req *req)
 390 {
 391         struct nvmet_ns *ns;
 392         struct nvme_id_ns *id;
 393         u16 status = 0;
 394
 395         if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
 396                 status = NVME_SC_INVALID_NS | NVME_SC_DNR;
 397                 goto out;
 398         }
 399
 400         id = kzalloc(sizeof(*id), GFP_KERNEL);
 401         if (!id) {
 402                 status = NVME_SC_INTERNAL;
 403                 goto out;
 404         }
 405
 406         /* return an all zeroed buffer if we can't find an active namespace */
 407         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
 408         if (!ns)
 409                 goto done;
 410
 411         /*
 412          * nuse = ncap = nsze isn't always true, but we have no way to find
 413          * that out from the underlying device.
 414          */
 415         id->ncap = id->nsze = cpu_to_le64(ns->size >> ns->blksize_shift);
 416         switch (req->port->ana_state[ns->anagrpid]) {
 417         case NVME_ANA_INACCESSIBLE:
 418         case NVME_ANA_PERSISTENT_LOSS:
 419                 break;
 420         default:
 421                 id->nuse = id->nsze;
 422                 break;
 423         }
 424
 425         /*
 426          * We just provide a single LBA format that matches what the
 427          * underlying device reports.
 428          */
 429         id->nlbaf = 0;
 430         id->flbas = 0;
 431
 432         /*
 433          * Our namespace might always be shared.  Not just with other
 434          * controllers, but also with any other user of the block device.
 435          */
 436         id->nmic = (1 << 0);
 437         id->anagrpid = cpu_to_le32(ns->anagrpid);
 438
 439         memcpy(&id->nguid, &ns->nguid, sizeof(id->nguid));
 440
 441         id->lbaf[0].ds = ns->blksize_shift;
 442
 443         if (ns->readonly)
 444                 id->nsattr |= (1 << 0);
 445         nvmet_put_namespace(ns);
 446 done:
 447         status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
 448         kfree(id);
 449 out:
 450         nvmet_req_complete(req, status);
 451 }
 452
 453 static void nvmet_execute_identify_nslist(struct nvmet_req *req)
 454 {
 455         static const int buf_size = NVME_IDENTIFY_DATA_SIZE;
 456         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 457         struct nvmet_ns *ns;
 458         u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid);
 459         __le32 *list;
 460         u16 status = 0;
 461         int i = 0;
 462
 463         list = kzalloc(buf_size, GFP_KERNEL);
 464         if (!list) {
 465                 status = NVME_SC_INTERNAL;
 466                 goto out;
 467         }
 468
 469         rcu_read_lock();
 470         list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
 471                 if (ns->nsid <= min_nsid)
 472                         continue;
 473                 list[i++] = cpu_to_le32(ns->nsid);
 474                 if (i == buf_size / sizeof(__le32))
 475                         break;
 476         }
 477         rcu_read_unlock();
 478
 479         status = nvmet_copy_to_sgl(req, 0, list, buf_size);
 480
 481         kfree(list);
 482 out:
 483         nvmet_req_complete(req, status);
 484 }
 485
 486 static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
 487                                     void *id, off_t *off)
 488 {
 489         struct nvme_ns_id_desc desc = {
 490                 .nidt = type,
 491                 .nidl = len,
 492         };
 493         u16 status;
 494
 495         status = nvmet_copy_to_sgl(req, *off, &desc, sizeof(desc));
 496         if (status)
 497                 return status;
 498         *off += sizeof(desc);
 499
 500         status = nvmet_copy_to_sgl(req, *off, id, len);
 501         if (status)
 502                 return status;
 503         *off += len;
 504
 505         return 0;
 506 }
 507
 508 static void nvmet_execute_identify_desclist(struct nvmet_req *req)
 509 {
 510         struct nvmet_ns *ns;
 511         u16 status = 0;
 512         off_t off = 0;
 513
 514         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
 515         if (!ns) {
 516                 status = NVME_SC_INVALID_NS | NVME_SC_DNR;
 517                 goto out;
 518         }
 519
 520         if (memchr_inv(&ns->uuid, 0, sizeof(ns->uuid))) {
 521                 status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID,
 522                                                   NVME_NIDT_UUID_LEN,
 523                                                   &ns->uuid, &off);
 524                 if (status)
 525                         goto out_put_ns;
 526         }
 527         if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) {
 528                 status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID,
 529                                                   NVME_NIDT_NGUID_LEN,
 530                                                   &ns->nguid, &off);
 531                 if (status)
 532                         goto out_put_ns;
 533         }
 534
 535         if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off,
 536                         off) != NVME_IDENTIFY_DATA_SIZE - off)
 537                 status = NVME_SC_INTERNAL | NVME_SC_DNR;
 538 out_put_ns:
 539         nvmet_put_namespace(ns);
 540 out:
 541         nvmet_req_complete(req, status);
 542 }
 543
 544 /*
 545  * A "minimum viable" abort implementation: the command is mandatory in the
 546  * spec, but we are not required to do any useful work.  We couldn't really
 547  * do a useful abort, so don't bother even with waiting for the command
 548  * to be exectuted and return immediately telling the command to abort
 549  * wasn't found.
 550  */
 551 static void nvmet_execute_abort(struct nvmet_req *req)
 552 {
 553         nvmet_set_result(req, 1);
 554         nvmet_req_complete(req, 0);
 555 }
 556
 557 static u16 nvmet_write_protect_flush_sync(struct nvmet_req *req)
 558 {
 559         u16 status;
 560
 561         if (req->ns->file)
 562                 status = nvmet_file_flush(req);
 563         else
 564                 status = nvmet_bdev_flush(req);
 565
 566         if (status)
 567                 pr_err("write protect flush failed nsid: %u\n", req->ns->nsid);
 568         return status;
 569 }
 570
 571 static u16 nvmet_set_feat_write_protect(struct nvmet_req *req)
 572 {
 573         u32 write_protect = le32_to_cpu(req->cmd->common.cdw10[1]);
 574         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 575         u16 status = NVME_SC_FEATURE_NOT_CHANGEABLE;
 576
 577         req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->rw.nsid);
 578         if (unlikely(!req->ns))
 579                 return status;
 580
 581         mutex_lock(&subsys->lock);
 582         switch (write_protect) {
 583         case NVME_NS_WRITE_PROTECT:
 584                 req->ns->readonly = true;
 585                 status = nvmet_write_protect_flush_sync(req);
 586                 if (status)
 587                         req->ns->readonly = false;
 588                 break;
 589         case NVME_NS_NO_WRITE_PROTECT:
 590                 req->ns->readonly = false;
 591                 status = 0;
 592                 break;
 593         default:
 594                 break;
 595         }
 596
 597         if (!status)
 598                 nvmet_ns_changed(subsys, req->ns->nsid);
 599         mutex_unlock(&subsys->lock);
 600         return status;
 601 }
 602
 603 static void nvmet_execute_set_features(struct nvmet_req *req)
 604 {
 605         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 606         u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]);
 607         u32 val32;
 608         u16 status = 0;
 609
 610         switch (cdw10 & 0xff) {
 611         case NVME_FEAT_NUM_QUEUES:
 612                 nvmet_set_result(req,
 613                         (subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
 614                 break;
 615         case NVME_FEAT_KATO:
 616                 val32 = le32_to_cpu(req->cmd->common.cdw10[1]);
 617                 req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000);
 618                 nvmet_set_result(req, req->sq->ctrl->kato);
 619                 break;
 620         case NVME_FEAT_ASYNC_EVENT:
 621                 val32 = le32_to_cpu(req->cmd->common.cdw10[1]);
 622                 if (val32 & ~NVMET_AEN_CFG_ALL) {
 623                         status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 624                         break;
 625                 }
 626
 627                 WRITE_ONCE(req->sq->ctrl->aen_enabled, val32);
 628                 nvmet_set_result(req, val32);
 629                 break;
 630         case NVME_FEAT_HOST_ID:
 631                 status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
 632                 break;
 633         case NVME_FEAT_WRITE_PROTECT:
 634                 status = nvmet_set_feat_write_protect(req);
 635                 break;
 636         default:
 637                 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 638                 break;
 639         }
 640
 641         nvmet_req_complete(req, status);
 642 }
 643
 644 static u16 nvmet_get_feat_write_protect(struct nvmet_req *req)
 645 {
 646         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 647         u32 result;
 648
 649         req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->common.nsid);
 650         if (!req->ns)
 651                 return NVME_SC_INVALID_NS | NVME_SC_DNR;
 652
 653         mutex_lock(&subsys->lock);
 654         if (req->ns->readonly == true)
 655                 result = NVME_NS_WRITE_PROTECT;
 656         else
 657                 result = NVME_NS_NO_WRITE_PROTECT;
 658         nvmet_set_result(req, result);
 659         mutex_unlock(&subsys->lock);
 660
 661         return 0;
 662 }
 663
 664 static void nvmet_execute_get_features(struct nvmet_req *req)
 665 {
 666         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 667         u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]);
 668         u16 status = 0;
 669
 670         switch (cdw10 & 0xff) {
 671         /*
 672          * These features are mandatory in the spec, but we don't
 673          * have a useful way to implement them.  We'll eventually
 674          * need to come up with some fake values for these.
 675          */
 676 #if 0
 677         case NVME_FEAT_ARBITRATION:
 678                 break;
 679         case NVME_FEAT_POWER_MGMT:
 680                 break;
 681         case NVME_FEAT_TEMP_THRESH:
 682                 break;
 683         case NVME_FEAT_ERR_RECOVERY:
 684                 break;
 685         case NVME_FEAT_IRQ_COALESCE:
 686                 break;
 687         case NVME_FEAT_IRQ_CONFIG:
 688                 break;
 689         case NVME_FEAT_WRITE_ATOMIC:
 690                 break;
 691 #endif
 692         case NVME_FEAT_ASYNC_EVENT:
 693                 nvmet_set_result(req, READ_ONCE(req->sq->ctrl->aen_enabled));
 694                 break;
 695         case NVME_FEAT_VOLATILE_WC:
 696                 nvmet_set_result(req, 1);
 697                 break;
 698         case NVME_FEAT_NUM_QUEUES:
 699                 nvmet_set_result(req,
 700                         (subsys->max_qid-1) | ((subsys->max_qid-1) << 16));
 701                 break;
 702         case NVME_FEAT_KATO:
 703                 nvmet_set_result(req, req->sq->ctrl->kato * 1000);
 704                 break;
 705         case NVME_FEAT_HOST_ID:
 706                 /* need 128-bit host identifier flag */
 707                 if (!(req->cmd->common.cdw10[1] & cpu_to_le32(1 << 0))) {
 708                         status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 709                         break;
 710                 }
 711
 712                 status = nvmet_copy_to_sgl(req, 0, &req->sq->ctrl->hostid,
 713                                 sizeof(req->sq->ctrl->hostid));
 714                 break;
 715         case NVME_FEAT_WRITE_PROTECT:
 716                 status = nvmet_get_feat_write_protect(req);
 717                 break;
 718         default:
 719                 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 720                 break;
 721         }
 722
 723         nvmet_req_complete(req, status);
 724 }
 725
 726 static void nvmet_execute_async_event(struct nvmet_req *req)
 727 {
 728         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 729
 730         mutex_lock(&ctrl->lock);
 731         if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) {
 732                 mutex_unlock(&ctrl->lock);
 733                 nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR);
 734                 return;
 735         }
 736         ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
 737         mutex_unlock(&ctrl->lock);
 738
 739         schedule_work(&ctrl->async_event_work);
 740 }
 741
 742 static void nvmet_execute_keep_alive(struct nvmet_req *req)
 743 {
 744         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 745
 746         pr_debug("ctrl %d update keep-alive timer for %d secs\n",
 747                 ctrl->cntlid, ctrl->kato);
 748
 749         mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
 750         nvmet_req_complete(req, 0);
 751 }
 752
 753 u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
 754 {
 755         struct nvme_command *cmd = req->cmd;
 756         u16 ret;
 757
 758         ret = nvmet_check_ctrl_status(req, cmd);
 759         if (unlikely(ret))
 760                 return ret;
 761
 762         switch (cmd->common.opcode) {
 763         case nvme_admin_get_log_page:
 764                 req->data_len = nvmet_get_log_page_len(cmd);
 765
 766                 switch (cmd->get_log_page.lid) {
 767                 case NVME_LOG_ERROR:
 768                         /*
 769                          * We currently never set the More bit in the status
 770                          * field, so all error log entries are invalid and can
 771                          * be zeroed out.  This is called a minum viable
 772                          * implementation (TM) of this mandatory log page.
 773                          */
 774                         req->execute = nvmet_execute_get_log_page_noop;
 775                         return 0;
 776                 case NVME_LOG_SMART:
 777                         req->execute = nvmet_execute_get_log_page_smart;
 778                         return 0;
 779                 case NVME_LOG_FW_SLOT:
 780                         /*
 781                          * We only support a single firmware slot which always
 782                          * is active, so we can zero out the whole firmware slot
 783                          * log and still claim to fully implement this mandatory
 784                          * log page.
 785                          */
 786                         req->execute = nvmet_execute_get_log_page_noop;
 787                         return 0;
 788                 case NVME_LOG_CHANGED_NS:
 789                         req->execute = nvmet_execute_get_log_changed_ns;
 790                         return 0;
 791                 case NVME_LOG_CMD_EFFECTS:
 792                         req->execute = nvmet_execute_get_log_cmd_effects_ns;
 793                         return 0;
 794                 case NVME_LOG_ANA:
 795                         req->execute = nvmet_execute_get_log_page_ana;
 796                         return 0;
 797                 }
 798                 break;
 799         case nvme_admin_identify:
 800                 req->data_len = NVME_IDENTIFY_DATA_SIZE;
 801                 switch (cmd->identify.cns) {
 802                 case NVME_ID_CNS_NS:
 803                         req->execute = nvmet_execute_identify_ns;
 804                         return 0;
 805                 case NVME_ID_CNS_CTRL:
 806                         req->execute = nvmet_execute_identify_ctrl;
 807                         return 0;
 808                 case NVME_ID_CNS_NS_ACTIVE_LIST:
 809                         req->execute = nvmet_execute_identify_nslist;
 810                         return 0;
 811                 case NVME_ID_CNS_NS_DESC_LIST:
 812                         req->execute = nvmet_execute_identify_desclist;
 813                         return 0;
 814                 }
 815                 break;
 816         case nvme_admin_abort_cmd:
 817                 req->execute = nvmet_execute_abort;
 818                 req->data_len = 0;
 819                 return 0;
 820         case nvme_admin_set_features:
 821                 req->execute = nvmet_execute_set_features;
 822                 req->data_len = 0;
 823                 return 0;
 824         case nvme_admin_get_features:
 825                 req->execute = nvmet_execute_get_features;
 826                 req->data_len = 0;
 827                 return 0;
 828         case nvme_admin_async_event:
 829                 req->execute = nvmet_execute_async_event;
 830                 req->data_len = 0;
 831                 return 0;
 832         case nvme_admin_keep_alive:
 833                 req->execute = nvmet_execute_keep_alive;
 834                 req->data_len = 0;
 835                 return 0;
 836         }
 837
 838         pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
 839                req->sq->qid);
 840         return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
 841 }