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