drivers/nvme/target/admin-cmd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * NVMe admin command implementation.
   4  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
   5  */
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7 #include <linux/module.h>
   8 #include <linux/rculist.h>
   9
  10 #include <generated/utsrelease.h>
  11 #include <asm/unaligned.h>
  12 #include "nvmet.h"
  13
  14 u32 nvmet_get_log_page_len(struct nvme_command *cmd)
  15 {
  16         u32 len = le16_to_cpu(cmd->get_log_page.numdu);
  17
  18         len <<= 16;
  19         len += le16_to_cpu(cmd->get_log_page.numdl);
  20         /* NUMD is a 0's based value */
  21         len += 1;
  22         len *= sizeof(u32);
  23
  24         return len;
  25 }
  26
  27 u64 nvmet_get_log_page_offset(struct nvme_command *cmd)
  28 {
  29         return le64_to_cpu(cmd->get_log_page.lpo);
  30 }
  31
  32 static void nvmet_execute_get_log_page_noop(struct nvmet_req *req)
  33 {
  34         nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->data_len));
  35 }
  36
  37 static void nvmet_execute_get_log_page_error(struct nvmet_req *req)
  38 {
  39         struct nvmet_ctrl *ctrl = req->sq->ctrl;
  40         u16 status = NVME_SC_SUCCESS;
  41         unsigned long flags;
  42         off_t offset = 0;
  43         u64 slot;
  44         u64 i;
  45
  46         spin_lock_irqsave(&ctrl->error_lock, flags);
  47         slot = ctrl->err_counter % NVMET_ERROR_LOG_SLOTS;
  48
  49         for (i = 0; i < NVMET_ERROR_LOG_SLOTS; i++) {
  50                 status = nvmet_copy_to_sgl(req, offset, &ctrl->slots[slot],
  51                                 sizeof(struct nvme_error_slot));
  52                 if (status)
  53                         break;
  54
  55                 if (slot == 0)
  56                         slot = NVMET_ERROR_LOG_SLOTS - 1;
  57                 else
  58                         slot--;
  59                 offset += sizeof(struct nvme_error_slot);
  60         }
  61         spin_unlock_irqrestore(&ctrl->error_lock, flags);
  62         nvmet_req_complete(req, status);
  63 }
  64
  65 static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
  66                 struct nvme_smart_log *slog)
  67 {
  68         struct nvmet_ns *ns;
  69         u64 host_reads, host_writes, data_units_read, data_units_written;
  70
  71         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid);
  72         if (!ns) {
  73                 pr_err("Could not find namespace id : %d\n",
  74                                 le32_to_cpu(req->cmd->get_log_page.nsid));
  75                 req->error_loc = offsetof(struct nvme_rw_command, nsid);
  76                 return NVME_SC_INVALID_NS;
  77         }
  78
  79         /* we don't have the right data for file backed ns */
  80         if (!ns->bdev)
  81                 goto out;
  82
  83         host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
  84         data_units_read = part_stat_read(ns->bdev->bd_part, sectors[READ]);
  85         host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
  86         data_units_written = part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
  87
  88         put_unaligned_le64(host_reads, &slog->host_reads[0]);
  89         put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
  90         put_unaligned_le64(host_writes, &slog->host_writes[0]);
  91         put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
  92 out:
  93         nvmet_put_namespace(ns);
  94
  95         return NVME_SC_SUCCESS;
  96 }
  97
  98 static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
  99                 struct nvme_smart_log *slog)
 100 {
 101         u64 host_reads = 0, host_writes = 0;
 102         u64 data_units_read = 0, data_units_written = 0;
 103         struct nvmet_ns *ns;
 104         struct nvmet_ctrl *ctrl;
 105
 106         ctrl = req->sq->ctrl;
 107
 108         rcu_read_lock();
 109         list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
 110                 /* we don't have the right data for file backed ns */
 111                 if (!ns->bdev)
 112                         continue;
 113                 host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
 114                 data_units_read +=
 115                         part_stat_read(ns->bdev->bd_part, sectors[READ]);
 116                 host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]);
 117                 data_units_written +=
 118                         part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
 119
 120         }
 121         rcu_read_unlock();
 122
 123         put_unaligned_le64(host_reads, &slog->host_reads[0]);
 124         put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
 125         put_unaligned_le64(host_writes, &slog->host_writes[0]);
 126         put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
 127
 128         return NVME_SC_SUCCESS;
 129 }
 130
 131 static void nvmet_execute_get_log_page_smart(struct nvmet_req *req)
 132 {
 133         struct nvme_smart_log *log;
 134         u16 status = NVME_SC_INTERNAL;
 135         unsigned long flags;
 136
 137         if (req->data_len != sizeof(*log))
 138                 goto out;
 139
 140         log = kzalloc(sizeof(*log), GFP_KERNEL);
 141         if (!log)
 142                 goto out;
 143
 144         if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL))
 145                 status = nvmet_get_smart_log_all(req, log);
 146         else
 147                 status = nvmet_get_smart_log_nsid(req, log);
 148         if (status)
 149                 goto out_free_log;
 150
 151         spin_lock_irqsave(&req->sq->ctrl->error_lock, flags);
 152         put_unaligned_le64(req->sq->ctrl->err_counter,
 153                         &log->num_err_log_entries);
 154         spin_unlock_irqrestore(&req->sq->ctrl->error_lock, flags);
 155
 156         status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
 157 out_free_log:
 158         kfree(log);
 159 out:
 160         nvmet_req_complete(req, status);
 161 }
 162
 163 static void nvmet_execute_get_log_cmd_effects_ns(struct nvmet_req *req)
 164 {
 165         u16 status = NVME_SC_INTERNAL;
 166         struct nvme_effects_log *log;
 167
 168         log = kzalloc(sizeof(*log), GFP_KERNEL);
 169         if (!log)
 170                 goto out;
 171
 172         log->acs[nvme_admin_get_log_page]       = cpu_to_le32(1 << 0);
 173         log->acs[nvme_admin_identify]           = cpu_to_le32(1 << 0);
 174         log->acs[nvme_admin_abort_cmd]          = cpu_to_le32(1 << 0);
 175         log->acs[nvme_admin_set_features]       = cpu_to_le32(1 << 0);
 176         log->acs[nvme_admin_get_features]       = cpu_to_le32(1 << 0);
 177         log->acs[nvme_admin_async_event]        = cpu_to_le32(1 << 0);
 178         log->acs[nvme_admin_keep_alive]         = cpu_to_le32(1 << 0);
 179
 180         log->iocs[nvme_cmd_read]                = cpu_to_le32(1 << 0);
 181         log->iocs[nvme_cmd_write]               = cpu_to_le32(1 << 0);
 182         log->iocs[nvme_cmd_flush]               = cpu_to_le32(1 << 0);
 183         log->iocs[nvme_cmd_dsm]                 = cpu_to_le32(1 << 0);
 184         log->iocs[nvme_cmd_write_zeroes]        = cpu_to_le32(1 << 0);
 185
 186         status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
 187
 188         kfree(log);
 189 out:
 190         nvmet_req_complete(req, status);
 191 }
 192
 193 static void nvmet_execute_get_log_changed_ns(struct nvmet_req *req)
 194 {
 195         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 196         u16 status = NVME_SC_INTERNAL;
 197         size_t len;
 198
 199         if (req->data_len != NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32))
 200                 goto out;
 201
 202         mutex_lock(&ctrl->lock);
 203         if (ctrl->nr_changed_ns == U32_MAX)
 204                 len = sizeof(__le32);
 205         else
 206                 len = ctrl->nr_changed_ns * sizeof(__le32);
 207         status = nvmet_copy_to_sgl(req, 0, ctrl->changed_ns_list, len);
 208         if (!status)
 209                 status = nvmet_zero_sgl(req, len, req->data_len - len);
 210         ctrl->nr_changed_ns = 0;
 211         nvmet_clear_aen_bit(req, NVME_AEN_BIT_NS_ATTR);
 212         mutex_unlock(&ctrl->lock);
 213 out:
 214         nvmet_req_complete(req, status);
 215 }
 216
 217 static u32 nvmet_format_ana_group(struct nvmet_req *req, u32 grpid,
 218                 struct nvme_ana_group_desc *desc)
 219 {
 220         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 221         struct nvmet_ns *ns;
 222         u32 count = 0;
 223
 224         if (!(req->cmd->get_log_page.lsp & NVME_ANA_LOG_RGO)) {
 225                 rcu_read_lock();
 226                 list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link)
 227                         if (ns->anagrpid == grpid)
 228                                 desc->nsids[count++] = cpu_to_le32(ns->nsid);
 229                 rcu_read_unlock();
 230         }
 231
 232         desc->grpid = cpu_to_le32(grpid);
 233         desc->nnsids = cpu_to_le32(count);
 234         desc->chgcnt = cpu_to_le64(nvmet_ana_chgcnt);
 235         desc->state = req->port->ana_state[grpid];
 236         memset(desc->rsvd17, 0, sizeof(desc->rsvd17));
 237         return sizeof(struct nvme_ana_group_desc) + count * sizeof(__le32);
 238 }
 239
 240 static void nvmet_execute_get_log_page_ana(struct nvmet_req *req)
 241 {
 242         struct nvme_ana_rsp_hdr hdr = { 0, };
 243         struct nvme_ana_group_desc *desc;
 244         size_t offset = sizeof(struct nvme_ana_rsp_hdr); /* start beyond hdr */
 245         size_t len;
 246         u32 grpid;
 247         u16 ngrps = 0;
 248         u16 status;
 249
 250         status = NVME_SC_INTERNAL;
 251         desc = kmalloc(sizeof(struct nvme_ana_group_desc) +
 252                         NVMET_MAX_NAMESPACES * sizeof(__le32), GFP_KERNEL);
 253         if (!desc)
 254                 goto out;
 255
 256         down_read(&nvmet_ana_sem);
 257         for (grpid = 1; grpid <= NVMET_MAX_ANAGRPS; grpid++) {
 258                 if (!nvmet_ana_group_enabled[grpid])
 259                         continue;
 260                 len = nvmet_format_ana_group(req, grpid, desc);
 261                 status = nvmet_copy_to_sgl(req, offset, desc, len);
 262                 if (status)
 263                         break;
 264                 offset += len;
 265                 ngrps++;
 266         }
 267         for ( ; grpid <= NVMET_MAX_ANAGRPS; grpid++) {
 268                 if (nvmet_ana_group_enabled[grpid])
 269                         ngrps++;
 270         }
 271
 272         hdr.chgcnt = cpu_to_le64(nvmet_ana_chgcnt);
 273         hdr.ngrps = cpu_to_le16(ngrps);
 274         nvmet_clear_aen_bit(req, NVME_AEN_BIT_ANA_CHANGE);
 275         up_read(&nvmet_ana_sem);
 276
 277         kfree(desc);
 278
 279         /* copy the header last once we know the number of groups */
 280         status = nvmet_copy_to_sgl(req, 0, &hdr, sizeof(hdr));
 281 out:
 282         nvmet_req_complete(req, status);
 283 }
 284
 285 static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
 286 {
 287         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 288         struct nvme_id_ctrl *id;
 289         u16 status = 0;
 290         const char model[] = "Linux";
 291
 292         id = kzalloc(sizeof(*id), GFP_KERNEL);
 293         if (!id) {
 294                 status = NVME_SC_INTERNAL;
 295                 goto out;
 296         }
 297
 298         /* XXX: figure out how to assign real vendors IDs. */
 299         id->vid = 0;
 300         id->ssvid = 0;
 301
 302         memset(id->sn, ' ', sizeof(id->sn));
 303         bin2hex(id->sn, &ctrl->subsys->serial,
 304                 min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2));
 305         memcpy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1, ' ');
 306         memcpy_and_pad(id->fr, sizeof(id->fr),
 307                        UTS_RELEASE, strlen(UTS_RELEASE), ' ');
 308
 309         id->rab = 6;
 310
 311         /*
 312          * XXX: figure out how we can assign a IEEE OUI, but until then
 313          * the safest is to leave it as zeroes.
 314          */
 315
 316         /* we support multiple ports, multiples hosts and ANA: */
 317         id->cmic = (1 << 0) | (1 << 1) | (1 << 3);
 318
 319         /* no limit on data transfer sizes for now */
 320         id->mdts = 0;
 321         id->cntlid = cpu_to_le16(ctrl->cntlid);
 322         id->ver = cpu_to_le32(ctrl->subsys->ver);
 323
 324         /* XXX: figure out what to do about RTD3R/RTD3 */
 325         id->oaes = cpu_to_le32(NVMET_AEN_CFG_OPTIONAL);
 326         id->ctratt = cpu_to_le32(NVME_CTRL_ATTR_HID_128_BIT |
 327                 NVME_CTRL_ATTR_TBKAS);
 328
 329         id->oacs = 0;
 330
 331         /*
 332          * We don't really have a practical limit on the number of abort
 333          * comands.  But we don't do anything useful for abort either, so
 334          * no point in allowing more abort commands than the spec requires.
 335          */
 336         id->acl = 3;
 337
 338         id->aerl = NVMET_ASYNC_EVENTS - 1;
 339
 340         /* first slot is read-only, only one slot supported */
 341         id->frmw = (1 << 0) | (1 << 1);
 342         id->lpa = (1 << 0) | (1 << 1) | (1 << 2);
 343         id->elpe = NVMET_ERROR_LOG_SLOTS - 1;
 344         id->npss = 0;
 345
 346         /* We support keep-alive timeout in granularity of seconds */
 347         id->kas = cpu_to_le16(NVMET_KAS);
 348
 349         id->sqes = (0x6 << 4) | 0x6;
 350         id->cqes = (0x4 << 4) | 0x4;
 351
 352         /* no enforcement soft-limit for maxcmd - pick arbitrary high value */
 353         id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
 354
 355         id->nn = cpu_to_le32(ctrl->subsys->max_nsid);
 356         id->mnan = cpu_to_le32(NVMET_MAX_NAMESPACES);
 357         id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM |
 358                         NVME_CTRL_ONCS_WRITE_ZEROES);
 359
 360         /* XXX: don't report vwc if the underlying device is write through */
 361         id->vwc = NVME_CTRL_VWC_PRESENT;
 362
 363         /*
 364          * We can't support atomic writes bigger than a LBA without support
 365          * from the backend device.
 366          */
 367         id->awun = 0;
 368         id->awupf = 0;
 369
 370         id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
 371         if (ctrl->ops->has_keyed_sgls)
 372                 id->sgls |= cpu_to_le32(1 << 2);
 373         if (req->port->inline_data_size)
 374                 id->sgls |= cpu_to_le32(1 << 20);
 375
 376         strlcpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));
 377
 378         /* Max command capsule size is sqe + single page of in-capsule data */
 379         id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
 380                                   req->port->inline_data_size) / 16);
 381         /* Max response capsule size is cqe */
 382         id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
 383
 384         id->msdbd = ctrl->ops->msdbd;
 385
 386         id->anacap = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4);
 387         id->anatt = 10; /* random value */
 388         id->anagrpmax = cpu_to_le32(NVMET_MAX_ANAGRPS);
 389         id->nanagrpid = cpu_to_le32(NVMET_MAX_ANAGRPS);
 390
 391         /*
 392          * Meh, we don't really support any power state.  Fake up the same
 393          * values that qemu does.
 394          */
 395         id->psd[0].max_power = cpu_to_le16(0x9c4);
 396         id->psd[0].entry_lat = cpu_to_le32(0x10);
 397         id->psd[0].exit_lat = cpu_to_le32(0x4);
 398
 399         id->nwpc = 1 << 0; /* write protect and no write protect */
 400
 401         status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
 402
 403         kfree(id);
 404 out:
 405         nvmet_req_complete(req, status);
 406 }
 407
 408 static void nvmet_execute_identify_ns(struct nvmet_req *req)
 409 {
 410         struct nvmet_ns *ns;
 411         struct nvme_id_ns *id;
 412         u16 status = 0;
 413
 414         if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
 415                 req->error_loc = offsetof(struct nvme_identify, nsid);
 416                 status = NVME_SC_INVALID_NS | NVME_SC_DNR;
 417                 goto out;
 418         }
 419
 420         id = kzalloc(sizeof(*id), GFP_KERNEL);
 421         if (!id) {
 422                 status = NVME_SC_INTERNAL;
 423                 goto out;
 424         }
 425
 426         /* return an all zeroed buffer if we can't find an active namespace */
 427         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
 428         if (!ns)
 429                 goto done;
 430
 431         /*
 432          * nuse = ncap = nsze isn't always true, but we have no way to find
 433          * that out from the underlying device.
 434          */
 435         id->ncap = id->nsze = cpu_to_le64(ns->size >> ns->blksize_shift);
 436         switch (req->port->ana_state[ns->anagrpid]) {
 437         case NVME_ANA_INACCESSIBLE:
 438         case NVME_ANA_PERSISTENT_LOSS:
 439                 break;
 440         default:
 441                 id->nuse = id->nsze;
 442                 break;
 443         }
 444
 445         if (ns->bdev)
 446                 nvmet_bdev_set_limits(ns->bdev, id);
 447
 448         /*
 449          * We just provide a single LBA format that matches what the
 450          * underlying device reports.
 451          */
 452         id->nlbaf = 0;
 453         id->flbas = 0;
 454
 455         /*
 456          * Our namespace might always be shared.  Not just with other
 457          * controllers, but also with any other user of the block device.
 458          */
 459         id->nmic = (1 << 0);
 460         id->anagrpid = cpu_to_le32(ns->anagrpid);
 461
 462         memcpy(&id->nguid, &ns->nguid, sizeof(id->nguid));
 463
 464         id->lbaf[0].ds = ns->blksize_shift;
 465
 466         if (ns->readonly)
 467                 id->nsattr |= (1 << 0);
 468         nvmet_put_namespace(ns);
 469 done:
 470         status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
 471         kfree(id);
 472 out:
 473         nvmet_req_complete(req, status);
 474 }
 475
 476 static void nvmet_execute_identify_nslist(struct nvmet_req *req)
 477 {
 478         static const int buf_size = NVME_IDENTIFY_DATA_SIZE;
 479         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 480         struct nvmet_ns *ns;
 481         u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid);
 482         __le32 *list;
 483         u16 status = 0;
 484         int i = 0;
 485
 486         list = kzalloc(buf_size, GFP_KERNEL);
 487         if (!list) {
 488                 status = NVME_SC_INTERNAL;
 489                 goto out;
 490         }
 491
 492         rcu_read_lock();
 493         list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
 494                 if (ns->nsid <= min_nsid)
 495                         continue;
 496                 list[i++] = cpu_to_le32(ns->nsid);
 497                 if (i == buf_size / sizeof(__le32))
 498                         break;
 499         }
 500         rcu_read_unlock();
 501
 502         status = nvmet_copy_to_sgl(req, 0, list, buf_size);
 503
 504         kfree(list);
 505 out:
 506         nvmet_req_complete(req, status);
 507 }
 508
 509 static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
 510                                     void *id, off_t *off)
 511 {
 512         struct nvme_ns_id_desc desc = {
 513                 .nidt = type,
 514                 .nidl = len,
 515         };
 516         u16 status;
 517
 518         status = nvmet_copy_to_sgl(req, *off, &desc, sizeof(desc));
 519         if (status)
 520                 return status;
 521         *off += sizeof(desc);
 522
 523         status = nvmet_copy_to_sgl(req, *off, id, len);
 524         if (status)
 525                 return status;
 526         *off += len;
 527
 528         return 0;
 529 }
 530
 531 static void nvmet_execute_identify_desclist(struct nvmet_req *req)
 532 {
 533         struct nvmet_ns *ns;
 534         u16 status = 0;
 535         off_t off = 0;
 536
 537         ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
 538         if (!ns) {
 539                 req->error_loc = offsetof(struct nvme_identify, nsid);
 540                 status = NVME_SC_INVALID_NS | NVME_SC_DNR;
 541                 goto out;
 542         }
 543
 544         if (memchr_inv(&ns->uuid, 0, sizeof(ns->uuid))) {
 545                 status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID,
 546                                                   NVME_NIDT_UUID_LEN,
 547                                                   &ns->uuid, &off);
 548                 if (status)
 549                         goto out_put_ns;
 550         }
 551         if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) {
 552                 status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID,
 553                                                   NVME_NIDT_NGUID_LEN,
 554                                                   &ns->nguid, &off);
 555                 if (status)
 556                         goto out_put_ns;
 557         }
 558
 559         if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off,
 560                         off) != NVME_IDENTIFY_DATA_SIZE - off)
 561                 status = NVME_SC_INTERNAL | NVME_SC_DNR;
 562 out_put_ns:
 563         nvmet_put_namespace(ns);
 564 out:
 565         nvmet_req_complete(req, status);
 566 }
 567
 568 /*
 569  * A "minimum viable" abort implementation: the command is mandatory in the
 570  * spec, but we are not required to do any useful work.  We couldn't really
 571  * do a useful abort, so don't bother even with waiting for the command
 572  * to be exectuted and return immediately telling the command to abort
 573  * wasn't found.
 574  */
 575 static void nvmet_execute_abort(struct nvmet_req *req)
 576 {
 577         nvmet_set_result(req, 1);
 578         nvmet_req_complete(req, 0);
 579 }
 580
 581 static u16 nvmet_write_protect_flush_sync(struct nvmet_req *req)
 582 {
 583         u16 status;
 584
 585         if (req->ns->file)
 586                 status = nvmet_file_flush(req);
 587         else
 588                 status = nvmet_bdev_flush(req);
 589
 590         if (status)
 591                 pr_err("write protect flush failed nsid: %u\n", req->ns->nsid);
 592         return status;
 593 }
 594
 595 static u16 nvmet_set_feat_write_protect(struct nvmet_req *req)
 596 {
 597         u32 write_protect = le32_to_cpu(req->cmd->common.cdw11);
 598         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 599         u16 status = NVME_SC_FEATURE_NOT_CHANGEABLE;
 600
 601         req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->rw.nsid);
 602         if (unlikely(!req->ns)) {
 603                 req->error_loc = offsetof(struct nvme_common_command, nsid);
 604                 return status;
 605         }
 606
 607         mutex_lock(&subsys->lock);
 608         switch (write_protect) {
 609         case NVME_NS_WRITE_PROTECT:
 610                 req->ns->readonly = true;
 611                 status = nvmet_write_protect_flush_sync(req);
 612                 if (status)
 613                         req->ns->readonly = false;
 614                 break;
 615         case NVME_NS_NO_WRITE_PROTECT:
 616                 req->ns->readonly = false;
 617                 status = 0;
 618                 break;
 619         default:
 620                 break;
 621         }
 622
 623         if (!status)
 624                 nvmet_ns_changed(subsys, req->ns->nsid);
 625         mutex_unlock(&subsys->lock);
 626         return status;
 627 }
 628
 629 u16 nvmet_set_feat_kato(struct nvmet_req *req)
 630 {
 631         u32 val32 = le32_to_cpu(req->cmd->common.cdw11);
 632
 633         req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000);
 634
 635         nvmet_set_result(req, req->sq->ctrl->kato);
 636
 637         return 0;
 638 }
 639
 640 u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask)
 641 {
 642         u32 val32 = le32_to_cpu(req->cmd->common.cdw11);
 643
 644         if (val32 & ~mask) {
 645                 req->error_loc = offsetof(struct nvme_common_command, cdw11);
 646                 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 647         }
 648
 649         WRITE_ONCE(req->sq->ctrl->aen_enabled, val32);
 650         nvmet_set_result(req, val32);
 651
 652         return 0;
 653 }
 654
 655 static void nvmet_execute_set_features(struct nvmet_req *req)
 656 {
 657         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 658         u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
 659         u16 status = 0;
 660
 661         switch (cdw10 & 0xff) {
 662         case NVME_FEAT_NUM_QUEUES:
 663                 nvmet_set_result(req,
 664                         (subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
 665                 break;
 666         case NVME_FEAT_KATO:
 667                 status = nvmet_set_feat_kato(req);
 668                 break;
 669         case NVME_FEAT_ASYNC_EVENT:
 670                 status = nvmet_set_feat_async_event(req, NVMET_AEN_CFG_ALL);
 671                 break;
 672         case NVME_FEAT_HOST_ID:
 673                 status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
 674                 break;
 675         case NVME_FEAT_WRITE_PROTECT:
 676                 status = nvmet_set_feat_write_protect(req);
 677                 break;
 678         default:
 679                 req->error_loc = offsetof(struct nvme_common_command, cdw10);
 680                 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 681                 break;
 682         }
 683
 684         nvmet_req_complete(req, status);
 685 }
 686
 687 static u16 nvmet_get_feat_write_protect(struct nvmet_req *req)
 688 {
 689         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 690         u32 result;
 691
 692         req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->common.nsid);
 693         if (!req->ns)  {
 694                 req->error_loc = offsetof(struct nvme_common_command, nsid);
 695                 return NVME_SC_INVALID_NS | NVME_SC_DNR;
 696         }
 697         mutex_lock(&subsys->lock);
 698         if (req->ns->readonly == true)
 699                 result = NVME_NS_WRITE_PROTECT;
 700         else
 701                 result = NVME_NS_NO_WRITE_PROTECT;
 702         nvmet_set_result(req, result);
 703         mutex_unlock(&subsys->lock);
 704
 705         return 0;
 706 }
 707
 708 void nvmet_get_feat_kato(struct nvmet_req *req)
 709 {
 710         nvmet_set_result(req, req->sq->ctrl->kato * 1000);
 711 }
 712
 713 void nvmet_get_feat_async_event(struct nvmet_req *req)
 714 {
 715         nvmet_set_result(req, READ_ONCE(req->sq->ctrl->aen_enabled));
 716 }
 717
 718 static void nvmet_execute_get_features(struct nvmet_req *req)
 719 {
 720         struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
 721         u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
 722         u16 status = 0;
 723
 724         switch (cdw10 & 0xff) {
 725         /*
 726          * These features are mandatory in the spec, but we don't
 727          * have a useful way to implement them.  We'll eventually
 728          * need to come up with some fake values for these.
 729          */
 730 #if 0
 731         case NVME_FEAT_ARBITRATION:
 732                 break;
 733         case NVME_FEAT_POWER_MGMT:
 734                 break;
 735         case NVME_FEAT_TEMP_THRESH:
 736                 break;
 737         case NVME_FEAT_ERR_RECOVERY:
 738                 break;
 739         case NVME_FEAT_IRQ_COALESCE:
 740                 break;
 741         case NVME_FEAT_IRQ_CONFIG:
 742                 break;
 743         case NVME_FEAT_WRITE_ATOMIC:
 744                 break;
 745 #endif
 746         case NVME_FEAT_ASYNC_EVENT:
 747                 nvmet_get_feat_async_event(req);
 748                 break;
 749         case NVME_FEAT_VOLATILE_WC:
 750                 nvmet_set_result(req, 1);
 751                 break;
 752         case NVME_FEAT_NUM_QUEUES:
 753                 nvmet_set_result(req,
 754                         (subsys->max_qid-1) | ((subsys->max_qid-1) << 16));
 755                 break;
 756         case NVME_FEAT_KATO:
 757                 nvmet_get_feat_kato(req);
 758                 break;
 759         case NVME_FEAT_HOST_ID:
 760                 /* need 128-bit host identifier flag */
 761                 if (!(req->cmd->common.cdw11 & cpu_to_le32(1 << 0))) {
 762                         req->error_loc =
 763                                 offsetof(struct nvme_common_command, cdw11);
 764                         status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 765                         break;
 766                 }
 767
 768                 status = nvmet_copy_to_sgl(req, 0, &req->sq->ctrl->hostid,
 769                                 sizeof(req->sq->ctrl->hostid));
 770                 break;
 771         case NVME_FEAT_WRITE_PROTECT:
 772                 status = nvmet_get_feat_write_protect(req);
 773                 break;
 774         default:
 775                 req->error_loc =
 776                         offsetof(struct nvme_common_command, cdw10);
 777                 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
 778                 break;
 779         }
 780
 781         nvmet_req_complete(req, status);
 782 }
 783
 784 void nvmet_execute_async_event(struct nvmet_req *req)
 785 {
 786         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 787
 788         mutex_lock(&ctrl->lock);
 789         if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) {
 790                 mutex_unlock(&ctrl->lock);
 791                 nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR);
 792                 return;
 793         }
 794         ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
 795         mutex_unlock(&ctrl->lock);
 796
 797         schedule_work(&ctrl->async_event_work);
 798 }
 799
 800 void nvmet_execute_keep_alive(struct nvmet_req *req)
 801 {
 802         struct nvmet_ctrl *ctrl = req->sq->ctrl;
 803
 804         pr_debug("ctrl %d update keep-alive timer for %d secs\n",
 805                 ctrl->cntlid, ctrl->kato);
 806
 807         mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
 808         nvmet_req_complete(req, 0);
 809 }
 810
 811 u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
 812 {
 813         struct nvme_command *cmd = req->cmd;
 814         u16 ret;
 815
 816         ret = nvmet_check_ctrl_status(req, cmd);
 817         if (unlikely(ret))
 818                 return ret;
 819
 820         switch (cmd->common.opcode) {
 821         case nvme_admin_get_log_page:
 822                 req->data_len = nvmet_get_log_page_len(cmd);
 823
 824                 switch (cmd->get_log_page.lid) {
 825                 case NVME_LOG_ERROR:
 826                         req->execute = nvmet_execute_get_log_page_error;
 827                         return 0;
 828                 case NVME_LOG_SMART:
 829                         req->execute = nvmet_execute_get_log_page_smart;
 830                         return 0;
 831                 case NVME_LOG_FW_SLOT:
 832                         /*
 833                          * We only support a single firmware slot which always
 834                          * is active, so we can zero out the whole firmware slot
 835                          * log and still claim to fully implement this mandatory
 836                          * log page.
 837                          */
 838                         req->execute = nvmet_execute_get_log_page_noop;
 839                         return 0;
 840                 case NVME_LOG_CHANGED_NS:
 841                         req->execute = nvmet_execute_get_log_changed_ns;
 842                         return 0;
 843                 case NVME_LOG_CMD_EFFECTS:
 844                         req->execute = nvmet_execute_get_log_cmd_effects_ns;
 845                         return 0;
 846                 case NVME_LOG_ANA:
 847                         req->execute = nvmet_execute_get_log_page_ana;
 848                         return 0;
 849                 }
 850                 break;
 851         case nvme_admin_identify:
 852                 req->data_len = NVME_IDENTIFY_DATA_SIZE;
 853                 switch (cmd->identify.cns) {
 854                 case NVME_ID_CNS_NS:
 855                         req->execute = nvmet_execute_identify_ns;
 856                         return 0;
 857                 case NVME_ID_CNS_CTRL:
 858                         req->execute = nvmet_execute_identify_ctrl;
 859                         return 0;
 860                 case NVME_ID_CNS_NS_ACTIVE_LIST:
 861                         req->execute = nvmet_execute_identify_nslist;
 862                         return 0;
 863                 case NVME_ID_CNS_NS_DESC_LIST:
 864                         req->execute = nvmet_execute_identify_desclist;
 865                         return 0;
 866                 }
 867                 break;
 868         case nvme_admin_abort_cmd:
 869                 req->execute = nvmet_execute_abort;
 870                 req->data_len = 0;
 871                 return 0;
 872         case nvme_admin_set_features:
 873                 req->execute = nvmet_execute_set_features;
 874                 req->data_len = 0;
 875                 return 0;
 876         case nvme_admin_get_features:
 877                 req->execute = nvmet_execute_get_features;
 878                 req->data_len = 0;
 879                 return 0;
 880         case nvme_admin_async_event:
 881                 req->execute = nvmet_execute_async_event;
 882                 req->data_len = 0;
 883                 return 0;
 884         case nvme_admin_keep_alive:
 885                 req->execute = nvmet_execute_keep_alive;
 886                 req->data_len = 0;
 887                 return 0;
 888         }
 889
 890         pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
 891                req->sq->qid);
 892         req->error_loc = offsetof(struct nvme_common_command, opcode);
 893         return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
 894 }