sys/dev/nvme/nvme_qpair.c

   1 /*-
   2  * Copyright (C) 2012-2014 Intel Corporation
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/bus.h>
  32
  33 #include <dev/pci/pcivar.h>
  34
  35 #include "nvme_private.h"
  36
  37 static void     _nvme_qpair_submit_request(struct nvme_qpair *qpair,
  38                                            struct nvme_request *req);
  39
  40 struct nvme_opcode_string {
  41
  42         uint16_t        opc;
  43         const char *    str;
  44 };
  45
  46 static struct nvme_opcode_string admin_opcode[] = {
  47         { NVME_OPC_DELETE_IO_SQ, "DELETE IO SQ" },
  48         { NVME_OPC_CREATE_IO_SQ, "CREATE IO SQ" },
  49         { NVME_OPC_GET_LOG_PAGE, "GET LOG PAGE" },
  50         { NVME_OPC_DELETE_IO_CQ, "DELETE IO CQ" },
  51         { NVME_OPC_CREATE_IO_CQ, "CREATE IO CQ" },
  52         { NVME_OPC_IDENTIFY, "IDENTIFY" },
  53         { NVME_OPC_ABORT, "ABORT" },
  54         { NVME_OPC_SET_FEATURES, "SET FEATURES" },
  55         { NVME_OPC_GET_FEATURES, "GET FEATURES" },
  56         { NVME_OPC_ASYNC_EVENT_REQUEST, "ASYNC EVENT REQUEST" },
  57         { NVME_OPC_FIRMWARE_ACTIVATE, "FIRMWARE ACTIVATE" },
  58         { NVME_OPC_FIRMWARE_IMAGE_DOWNLOAD, "FIRMWARE IMAGE DOWNLOAD" },
  59         { NVME_OPC_FORMAT_NVM, "FORMAT NVM" },
  60         { NVME_OPC_SECURITY_SEND, "SECURITY SEND" },
  61         { NVME_OPC_SECURITY_RECEIVE, "SECURITY RECEIVE" },
  62         { 0xFFFF, "ADMIN COMMAND" }
  63 };
  64
  65 static struct nvme_opcode_string io_opcode[] = {
  66         { NVME_OPC_FLUSH, "FLUSH" },
  67         { NVME_OPC_WRITE, "WRITE" },
  68         { NVME_OPC_READ, "READ" },
  69         { NVME_OPC_WRITE_UNCORRECTABLE, "WRITE UNCORRECTABLE" },
  70         { NVME_OPC_COMPARE, "COMPARE" },
  71         { NVME_OPC_DATASET_MANAGEMENT, "DATASET MANAGEMENT" },
  72         { 0xFFFF, "IO COMMAND" }
  73 };
  74
  75 static const char *
  76 get_admin_opcode_string(uint16_t opc)
  77 {
  78         struct nvme_opcode_string *entry;
  79
  80         entry = admin_opcode;
  81
  82         while (entry->opc != 0xFFFF) {
  83                 if (entry->opc == opc)
  84                         return (entry->str);
  85                 entry++;
  86         }
  87         return (entry->str);
  88 }
  89
  90 static const char *
  91 get_io_opcode_string(uint16_t opc)
  92 {
  93         struct nvme_opcode_string *entry;
  94
  95         entry = io_opcode;
  96
  97         while (entry->opc != 0xFFFF) {
  98                 if (entry->opc == opc)
  99                         return (entry->str);
 100                 entry++;
 101         }
 102         return (entry->str);
 103 }
 104
 105
 106 static void
 107 nvme_admin_qpair_print_command(struct nvme_qpair *qpair,
 108     struct nvme_command *cmd)
 109 {
 110
 111         nvme_printf(qpair->ctrlr, "%s (%02x) sqid:%d cid:%d nsid:%x "
 112             "cdw10:%08x cdw11:%08x\n",
 113             get_admin_opcode_string(cmd->opc), cmd->opc, qpair->id, cmd->cid,
 114             cmd->nsid, cmd->cdw10, cmd->cdw11);
 115 }
 116
 117 static void
 118 nvme_io_qpair_print_command(struct nvme_qpair *qpair,
 119     struct nvme_command *cmd)
 120 {
 121
 122         switch (cmd->opc) {
 123         case NVME_OPC_WRITE:
 124         case NVME_OPC_READ:
 125         case NVME_OPC_WRITE_UNCORRECTABLE:
 126         case NVME_OPC_COMPARE:
 127                 nvme_printf(qpair->ctrlr, "%s sqid:%d cid:%d nsid:%d "
 128                     "lba:%llu len:%d\n",
 129                     get_io_opcode_string(cmd->opc), qpair->id, cmd->cid,
 130                     cmd->nsid,
 131                     ((unsigned long long)cmd->cdw11 << 32) + cmd->cdw10,
 132                     (cmd->cdw12 & 0xFFFF) + 1);
 133                 break;
 134         case NVME_OPC_FLUSH:
 135         case NVME_OPC_DATASET_MANAGEMENT:
 136                 nvme_printf(qpair->ctrlr, "%s sqid:%d cid:%d nsid:%d\n",
 137                     get_io_opcode_string(cmd->opc), qpair->id, cmd->cid,
 138                     cmd->nsid);
 139                 break;
 140         default:
 141                 nvme_printf(qpair->ctrlr, "%s (%02x) sqid:%d cid:%d nsid:%d\n",
 142                     get_io_opcode_string(cmd->opc), cmd->opc, qpair->id,
 143                     cmd->cid, cmd->nsid);
 144                 break;
 145         }
 146 }
 147
 148 static void
 149 nvme_qpair_print_command(struct nvme_qpair *qpair, struct nvme_command *cmd)
 150 {
 151         if (qpair->id == 0)
 152                 nvme_admin_qpair_print_command(qpair, cmd);
 153         else
 154                 nvme_io_qpair_print_command(qpair, cmd);
 155 }
 156
 157 struct nvme_status_string {
 158
 159         uint16_t        sc;
 160         const char *    str;
 161 };
 162
 163 static struct nvme_status_string generic_status[] = {
 164         { NVME_SC_SUCCESS, "SUCCESS" },
 165         { NVME_SC_INVALID_OPCODE, "INVALID OPCODE" },
 166         { NVME_SC_INVALID_FIELD, "INVALID_FIELD" },
 167         { NVME_SC_COMMAND_ID_CONFLICT, "COMMAND ID CONFLICT" },
 168         { NVME_SC_DATA_TRANSFER_ERROR, "DATA TRANSFER ERROR" },
 169         { NVME_SC_ABORTED_POWER_LOSS, "ABORTED - POWER LOSS" },
 170         { NVME_SC_INTERNAL_DEVICE_ERROR, "INTERNAL DEVICE ERROR" },
 171         { NVME_SC_ABORTED_BY_REQUEST, "ABORTED - BY REQUEST" },
 172         { NVME_SC_ABORTED_SQ_DELETION, "ABORTED - SQ DELETION" },
 173         { NVME_SC_ABORTED_FAILED_FUSED, "ABORTED - FAILED FUSED" },
 174         { NVME_SC_ABORTED_MISSING_FUSED, "ABORTED - MISSING FUSED" },
 175         { NVME_SC_INVALID_NAMESPACE_OR_FORMAT, "INVALID NAMESPACE OR FORMAT" },
 176         { NVME_SC_COMMAND_SEQUENCE_ERROR, "COMMAND SEQUENCE ERROR" },
 177         { NVME_SC_LBA_OUT_OF_RANGE, "LBA OUT OF RANGE" },
 178         { NVME_SC_CAPACITY_EXCEEDED, "CAPACITY EXCEEDED" },
 179         { NVME_SC_NAMESPACE_NOT_READY, "NAMESPACE NOT READY" },
 180         { 0xFFFF, "GENERIC" }
 181 };
 182
 183 static struct nvme_status_string command_specific_status[] = {
 184         { NVME_SC_COMPLETION_QUEUE_INVALID, "INVALID COMPLETION QUEUE" },
 185         { NVME_SC_INVALID_QUEUE_IDENTIFIER, "INVALID QUEUE IDENTIFIER" },
 186         { NVME_SC_MAXIMUM_QUEUE_SIZE_EXCEEDED, "MAX QUEUE SIZE EXCEEDED" },
 187         { NVME_SC_ABORT_COMMAND_LIMIT_EXCEEDED, "ABORT CMD LIMIT EXCEEDED" },
 188         { NVME_SC_ASYNC_EVENT_REQUEST_LIMIT_EXCEEDED, "ASYNC LIMIT EXCEEDED" },
 189         { NVME_SC_INVALID_FIRMWARE_SLOT, "INVALID FIRMWARE SLOT" },
 190         { NVME_SC_INVALID_FIRMWARE_IMAGE, "INVALID FIRMWARE IMAGE" },
 191         { NVME_SC_INVALID_INTERRUPT_VECTOR, "INVALID INTERRUPT VECTOR" },
 192         { NVME_SC_INVALID_LOG_PAGE, "INVALID LOG PAGE" },
 193         { NVME_SC_INVALID_FORMAT, "INVALID FORMAT" },
 194         { NVME_SC_FIRMWARE_REQUIRES_RESET, "FIRMWARE REQUIRES RESET" },
 195         { NVME_SC_CONFLICTING_ATTRIBUTES, "CONFLICTING ATTRIBUTES" },
 196         { NVME_SC_INVALID_PROTECTION_INFO, "INVALID PROTECTION INFO" },
 197         { NVME_SC_ATTEMPTED_WRITE_TO_RO_PAGE, "WRITE TO RO PAGE" },
 198         { 0xFFFF, "COMMAND SPECIFIC" }
 199 };
 200
 201 static struct nvme_status_string media_error_status[] = {
 202         { NVME_SC_WRITE_FAULTS, "WRITE FAULTS" },
 203         { NVME_SC_UNRECOVERED_READ_ERROR, "UNRECOVERED READ ERROR" },
 204         { NVME_SC_GUARD_CHECK_ERROR, "GUARD CHECK ERROR" },
 205         { NVME_SC_APPLICATION_TAG_CHECK_ERROR, "APPLICATION TAG CHECK ERROR" },
 206         { NVME_SC_REFERENCE_TAG_CHECK_ERROR, "REFERENCE TAG CHECK ERROR" },
 207         { NVME_SC_COMPARE_FAILURE, "COMPARE FAILURE" },
 208         { NVME_SC_ACCESS_DENIED, "ACCESS DENIED" },
 209         { 0xFFFF, "MEDIA ERROR" }
 210 };
 211
 212 static const char *
 213 get_status_string(uint16_t sct, uint16_t sc)
 214 {
 215         struct nvme_status_string *entry;
 216
 217         switch (sct) {
 218         case NVME_SCT_GENERIC:
 219                 entry = generic_status;
 220                 break;
 221         case NVME_SCT_COMMAND_SPECIFIC:
 222                 entry = command_specific_status;
 223                 break;
 224         case NVME_SCT_MEDIA_ERROR:
 225                 entry = media_error_status;
 226                 break;
 227         case NVME_SCT_VENDOR_SPECIFIC:
 228                 return ("VENDOR SPECIFIC");
 229         default:
 230                 return ("RESERVED");
 231         }
 232
 233         while (entry->sc != 0xFFFF) {
 234                 if (entry->sc == sc)
 235                         return (entry->str);
 236                 entry++;
 237         }
 238         return (entry->str);
 239 }
 240
 241 static void
 242 nvme_qpair_print_completion(struct nvme_qpair *qpair,
 243     struct nvme_completion *cpl)
 244 {
 245         nvme_printf(qpair->ctrlr, "%s (%02x/%02x) sqid:%d cid:%d cdw0:%x\n",
 246             get_status_string(cpl->status.sct, cpl->status.sc),
 247             cpl->status.sct, cpl->status.sc, cpl->sqid, cpl->cid, cpl->cdw0);
 248 }
 249
 250 static boolean_t
 251 nvme_completion_is_retry(const struct nvme_completion *cpl)
 252 {
 253         /*
 254          * TODO: spec is not clear how commands that are aborted due
 255          *  to TLER will be marked.  So for now, it seems
 256          *  NAMESPACE_NOT_READY is the only case where we should
 257          *  look at the DNR bit.
 258          */
 259         switch (cpl->status.sct) {
 260         case NVME_SCT_GENERIC:
 261                 switch (cpl->status.sc) {
 262                 case NVME_SC_ABORTED_BY_REQUEST:
 263                 case NVME_SC_NAMESPACE_NOT_READY:
 264                         if (cpl->status.dnr)
 265                                 return (0);
 266                         else
 267                                 return (1);
 268                 case NVME_SC_INVALID_OPCODE:
 269                 case NVME_SC_INVALID_FIELD:
 270                 case NVME_SC_COMMAND_ID_CONFLICT:
 271                 case NVME_SC_DATA_TRANSFER_ERROR:
 272                 case NVME_SC_ABORTED_POWER_LOSS:
 273                 case NVME_SC_INTERNAL_DEVICE_ERROR:
 274                 case NVME_SC_ABORTED_SQ_DELETION:
 275                 case NVME_SC_ABORTED_FAILED_FUSED:
 276                 case NVME_SC_ABORTED_MISSING_FUSED:
 277                 case NVME_SC_INVALID_NAMESPACE_OR_FORMAT:
 278                 case NVME_SC_COMMAND_SEQUENCE_ERROR:
 279                 case NVME_SC_LBA_OUT_OF_RANGE:
 280                 case NVME_SC_CAPACITY_EXCEEDED:
 281                 default:
 282                         return (0);
 283                 }
 284         case NVME_SCT_COMMAND_SPECIFIC:
 285         case NVME_SCT_MEDIA_ERROR:
 286         case NVME_SCT_VENDOR_SPECIFIC:
 287         default:
 288                 return (0);
 289         }
 290 }
 291
 292 static void
 293 nvme_qpair_construct_tracker(struct nvme_qpair *qpair, struct nvme_tracker *tr,
 294     uint16_t cid)
 295 {
 296
 297         bus_dmamap_create(qpair->dma_tag, 0, &tr->payload_dma_map);
 298         bus_dmamap_create(qpair->dma_tag, 0, &tr->prp_dma_map);
 299
 300         bus_dmamap_load(qpair->dma_tag, tr->prp_dma_map, tr->prp,
 301             sizeof(tr->prp), nvme_single_map, &tr->prp_bus_addr, 0);
 302
 303         callout_init(&tr->timer, 1);
 304         tr->cid = cid;
 305         tr->qpair = qpair;
 306 }
 307
 308 static void
 309 nvme_qpair_complete_tracker(struct nvme_qpair *qpair, struct nvme_tracker *tr,
 310     struct nvme_completion *cpl, boolean_t print_on_error)
 311 {
 312         struct nvme_request     *req;
 313         boolean_t               retry, error;
 314
 315         req = tr->req;
 316         error = nvme_completion_is_error(cpl);
 317         retry = error && nvme_completion_is_retry(cpl) &&
 318            req->retries < nvme_retry_count;
 319
 320         if (error && print_on_error) {
 321                 nvme_qpair_print_command(qpair, &req->cmd);
 322                 nvme_qpair_print_completion(qpair, cpl);
 323         }
 324
 325         qpair->act_tr[cpl->cid] = NULL;
 326
 327         KASSERT(cpl->cid == req->cmd.cid, ("cpl cid does not match cmd cid\n"));
 328
 329         if (req->cb_fn && !retry)
 330                 req->cb_fn(req->cb_arg, cpl);
 331
 332         mtx_lock(&qpair->lock);
 333         callout_stop(&tr->timer);
 334
 335         if (retry) {
 336                 req->retries++;
 337                 nvme_qpair_submit_tracker(qpair, tr);
 338         } else {
 339                 if (req->type != NVME_REQUEST_NULL)
 340                         bus_dmamap_unload(qpair->dma_tag,
 341                             tr->payload_dma_map);
 342
 343                 nvme_free_request(req);
 344                 tr->req = NULL;
 345
 346                 TAILQ_REMOVE(&qpair->outstanding_tr, tr, tailq);
 347                 TAILQ_INSERT_HEAD(&qpair->free_tr, tr, tailq);
 348
 349                 /*
 350                  * If the controller is in the middle of resetting, don't
 351                  *  try to submit queued requests here - let the reset logic
 352                  *  handle that instead.
 353                  */
 354                 if (!STAILQ_EMPTY(&qpair->queued_req) &&
 355                     !qpair->ctrlr->is_resetting) {
 356                         req = STAILQ_FIRST(&qpair->queued_req);
 357                         STAILQ_REMOVE_HEAD(&qpair->queued_req, stailq);
 358                         _nvme_qpair_submit_request(qpair, req);
 359                 }
 360         }
 361
 362         mtx_unlock(&qpair->lock);
 363 }
 364
 365 static void
 366 nvme_qpair_manual_complete_tracker(struct nvme_qpair *qpair,
 367     struct nvme_tracker *tr, uint32_t sct, uint32_t sc, uint32_t dnr,
 368     boolean_t print_on_error)
 369 {
 370         struct nvme_completion  cpl;
 371
 372         memset(&cpl, 0, sizeof(cpl));
 373         cpl.sqid = qpair->id;
 374         cpl.cid = tr->cid;
 375         cpl.status.sct = sct;
 376         cpl.status.sc = sc;
 377         cpl.status.dnr = dnr;
 378         nvme_qpair_complete_tracker(qpair, tr, &cpl, print_on_error);
 379 }
 380
 381 void
 382 nvme_qpair_manual_complete_request(struct nvme_qpair *qpair,
 383     struct nvme_request *req, uint32_t sct, uint32_t sc,
 384     boolean_t print_on_error)
 385 {
 386         struct nvme_completion  cpl;
 387         boolean_t               error;
 388
 389         memset(&cpl, 0, sizeof(cpl));
 390         cpl.sqid = qpair->id;
 391         cpl.status.sct = sct;
 392         cpl.status.sc = sc;
 393
 394         error = nvme_completion_is_error(&cpl);
 395
 396         if (error && print_on_error) {
 397                 nvme_qpair_print_command(qpair, &req->cmd);
 398                 nvme_qpair_print_completion(qpair, &cpl);
 399         }
 400
 401         if (req->cb_fn)
 402                 req->cb_fn(req->cb_arg, &cpl);
 403
 404         nvme_free_request(req);
 405 }
 406
 407 void
 408 nvme_qpair_process_completions(struct nvme_qpair *qpair)
 409 {
 410         struct nvme_tracker     *tr;
 411         struct nvme_completion  *cpl;
 412
 413         qpair->num_intr_handler_calls++;
 414
 415         if (!qpair->is_enabled)
 416                 /*
 417                  * qpair is not enabled, likely because a controller reset is
 418                  *  is in progress.  Ignore the interrupt - any I/O that was
 419                  *  associated with this interrupt will get retried when the
 420                  *  reset is complete.
 421                  */
 422                 return;
 423
 424         while (1) {
 425                 cpl = &qpair->cpl[qpair->cq_head];
 426
 427                 if (cpl->status.p != qpair->phase)
 428                         break;
 429
 430                 tr = qpair->act_tr[cpl->cid];
 431
 432                 if (tr != NULL) {
 433                         nvme_qpair_complete_tracker(qpair, tr, cpl, TRUE);
 434                         qpair->sq_head = cpl->sqhd;
 435                 } else {
 436                         nvme_printf(qpair->ctrlr,
 437                             "cpl does not map to outstanding cmd\n");
 438                         nvme_dump_completion(cpl);
 439                         KASSERT(0, ("received completion for unknown cmd\n"));
 440                 }
 441
 442                 if (++qpair->cq_head == qpair->num_entries) {
 443                         qpair->cq_head = 0;
 444                         qpair->phase = !qpair->phase;
 445                 }
 446
 447                 nvme_mmio_write_4(qpair->ctrlr, doorbell[qpair->id].cq_hdbl,
 448                     qpair->cq_head);
 449         }
 450 }
 451
 452 static void
 453 nvme_qpair_msix_handler(void *arg)
 454 {
 455         struct nvme_qpair *qpair = arg;
 456
 457         nvme_qpair_process_completions(qpair);
 458 }
 459
 460 void
 461 nvme_qpair_construct(struct nvme_qpair *qpair, uint32_t id,
 462     uint16_t vector, uint32_t num_entries, uint32_t num_trackers,
 463     struct nvme_controller *ctrlr)
 464 {
 465         struct nvme_tracker     *tr;
 466         uint32_t                i;
 467
 468         qpair->id = id;
 469         qpair->vector = vector;
 470         qpair->num_entries = num_entries;
 471 #ifdef CHATHAM2
 472         /*
 473          * Chatham prototype board starts having issues at higher queue
 474          *  depths.  So use a conservative estimate here of no more than 64
 475          *  outstanding I/O per queue at any one point.
 476          */
 477         if (pci_get_devid(ctrlr->dev) == CHATHAM_PCI_ID)
 478                 num_trackers = min(num_trackers, 64);
 479 #endif
 480         qpair->num_trackers = num_trackers;
 481         qpair->ctrlr = ctrlr;
 482
 483         if (ctrlr->msix_enabled) {
 484
 485                 /*
 486                  * MSI-X vector resource IDs start at 1, so we add one to
 487                  *  the queue's vector to get the corresponding rid to use.
 488                  */
 489                 qpair->rid = vector + 1;
 490                 qpair->res = ctrlr->msi_res[vector];
 491
 492                 bus_setup_intr(ctrlr->dev, qpair->res,
 493                     INTR_TYPE_MISC | INTR_MPSAFE, NULL,
 494                     nvme_qpair_msix_handler, qpair, &qpair->tag);
 495         }
 496
 497         mtx_init(&qpair->lock, "nvme qpair lock", NULL, MTX_DEF);
 498
 499         /* Note: NVMe PRP format is restricted to 4-byte alignment. */
 500         bus_dma_tag_create(bus_get_dma_tag(ctrlr->dev),
 501             4, PAGE_SIZE, BUS_SPACE_MAXADDR,
 502             BUS_SPACE_MAXADDR, NULL, NULL, NVME_MAX_XFER_SIZE,
 503             (NVME_MAX_XFER_SIZE/PAGE_SIZE)+1, PAGE_SIZE, 0,
 504             NULL, NULL, &qpair->dma_tag);
 505
 506         qpair->num_cmds = 0;
 507         qpair->num_intr_handler_calls = 0;
 508
 509         qpair->cmd = contigmalloc(qpair->num_entries *
 510             sizeof(struct nvme_command), M_NVME, M_ZERO,
 511             0, BUS_SPACE_MAXADDR, PAGE_SIZE, 0);
 512         qpair->cpl = contigmalloc(qpair->num_entries *
 513             sizeof(struct nvme_completion), M_NVME, M_ZERO,
 514             0, BUS_SPACE_MAXADDR, PAGE_SIZE, 0);
 515
 516         bus_dmamap_create(qpair->dma_tag, 0, &qpair->cmd_dma_map);
 517         bus_dmamap_create(qpair->dma_tag, 0, &qpair->cpl_dma_map);
 518
 519         bus_dmamap_load(qpair->dma_tag, qpair->cmd_dma_map,
 520             qpair->cmd, qpair->num_entries * sizeof(struct nvme_command),
 521             nvme_single_map, &qpair->cmd_bus_addr, 0);
 522         bus_dmamap_load(qpair->dma_tag, qpair->cpl_dma_map,
 523             qpair->cpl, qpair->num_entries * sizeof(struct nvme_completion),
 524             nvme_single_map, &qpair->cpl_bus_addr, 0);
 525
 526         qpair->sq_tdbl_off = nvme_mmio_offsetof(doorbell[id].sq_tdbl);
 527         qpair->cq_hdbl_off = nvme_mmio_offsetof(doorbell[id].cq_hdbl);
 528
 529         TAILQ_INIT(&qpair->free_tr);
 530         TAILQ_INIT(&qpair->outstanding_tr);
 531         STAILQ_INIT(&qpair->queued_req);
 532
 533         for (i = 0; i < qpair->num_trackers; i++) {
 534                 tr = malloc(sizeof(*tr), M_NVME, M_ZERO | M_WAITOK);
 535                 nvme_qpair_construct_tracker(qpair, tr, i);
 536                 TAILQ_INSERT_HEAD(&qpair->free_tr, tr, tailq);
 537         }
 538
 539         qpair->act_tr = malloc(sizeof(struct nvme_tracker *) * qpair->num_entries,
 540             M_NVME, M_ZERO | M_WAITOK);
 541 }
 542
 543 static void
 544 nvme_qpair_destroy(struct nvme_qpair *qpair)
 545 {
 546         struct nvme_tracker     *tr;
 547
 548         if (qpair->tag)
 549                 bus_teardown_intr(qpair->ctrlr->dev, qpair->res, qpair->tag);
 550
 551         if (qpair->res)
 552                 bus_release_resource(qpair->ctrlr->dev, SYS_RES_IRQ,
 553                     rman_get_rid(qpair->res), qpair->res);
 554
 555         if (qpair->cmd) {
 556                 bus_dmamap_unload(qpair->dma_tag, qpair->cmd_dma_map);
 557                 bus_dmamap_destroy(qpair->dma_tag, qpair->cmd_dma_map);
 558                 contigfree(qpair->cmd,
 559                     qpair->num_entries * sizeof(struct nvme_command), M_NVME);
 560         }
 561
 562         if (qpair->cpl) {
 563                 bus_dmamap_unload(qpair->dma_tag, qpair->cpl_dma_map);
 564                 bus_dmamap_destroy(qpair->dma_tag, qpair->cpl_dma_map);
 565                 contigfree(qpair->cpl,
 566                     qpair->num_entries * sizeof(struct nvme_completion),
 567                     M_NVME);
 568         }
 569
 570         if (qpair->dma_tag)
 571                 bus_dma_tag_destroy(qpair->dma_tag);
 572
 573         if (qpair->act_tr)
 574                 free(qpair->act_tr, M_NVME);
 575
 576         while (!TAILQ_EMPTY(&qpair->free_tr)) {
 577                 tr = TAILQ_FIRST(&qpair->free_tr);
 578                 TAILQ_REMOVE(&qpair->free_tr, tr, tailq);
 579                 bus_dmamap_destroy(qpair->dma_tag, tr->payload_dma_map);
 580                 bus_dmamap_destroy(qpair->dma_tag, tr->prp_dma_map);
 581                 free(tr, M_NVME);
 582         }
 583 }
 584
 585 static void
 586 nvme_admin_qpair_abort_aers(struct nvme_qpair *qpair)
 587 {
 588         struct nvme_tracker     *tr;
 589
 590         tr = TAILQ_FIRST(&qpair->outstanding_tr);
 591         while (tr != NULL) {
 592                 if (tr->req->cmd.opc == NVME_OPC_ASYNC_EVENT_REQUEST) {
 593                         nvme_qpair_manual_complete_tracker(qpair, tr,
 594                             NVME_SCT_GENERIC, NVME_SC_ABORTED_SQ_DELETION, 0,
 595                             FALSE);
 596                         tr = TAILQ_FIRST(&qpair->outstanding_tr);
 597                 } else {
 598                         tr = TAILQ_NEXT(tr, tailq);
 599                 }
 600         }
 601 }
 602
 603 void
 604 nvme_admin_qpair_destroy(struct nvme_qpair *qpair)
 605 {
 606
 607         nvme_admin_qpair_abort_aers(qpair);
 608         nvme_qpair_destroy(qpair);
 609 }
 610
 611 void
 612 nvme_io_qpair_destroy(struct nvme_qpair *qpair)
 613 {
 614
 615         nvme_qpair_destroy(qpair);
 616 }
 617
 618 static void
 619 nvme_abort_complete(void *arg, const struct nvme_completion *status)
 620 {
 621         struct nvme_tracker     *tr = arg;
 622
 623         /*
 624          * If cdw0 == 1, the controller was not able to abort the command
 625          *  we requested.  We still need to check the active tracker array,
 626          *  to cover race where I/O timed out at same time controller was
 627          *  completing the I/O.
 628          */
 629         if (status->cdw0 == 1 && tr->qpair->act_tr[tr->cid] != NULL) {
 630                 /*
 631                  * An I/O has timed out, and the controller was unable to
 632                  *  abort it for some reason.  Construct a fake completion
 633                  *  status, and then complete the I/O's tracker manually.
 634                  */
 635                 nvme_printf(tr->qpair->ctrlr,
 636                     "abort command failed, aborting command manually\n");
 637                 nvme_qpair_manual_complete_tracker(tr->qpair, tr,
 638                     NVME_SCT_GENERIC, NVME_SC_ABORTED_BY_REQUEST, 0, TRUE);
 639         }
 640 }
 641
 642 static void
 643 nvme_timeout(void *arg)
 644 {
 645         struct nvme_tracker     *tr = arg;
 646         struct nvme_qpair       *qpair = tr->qpair;
 647         struct nvme_controller  *ctrlr = qpair->ctrlr;
 648         union csts_register     csts;
 649
 650         /* Read csts to get value of cfs - controller fatal status. */
 651         csts.raw = nvme_mmio_read_4(ctrlr, csts);
 652
 653         if (ctrlr->enable_aborts && csts.bits.cfs == 0) {
 654                 /*
 655                  * If aborts are enabled, only use them if the controller is
 656                  *  not reporting fatal status.
 657                  */
 658                 nvme_ctrlr_cmd_abort(ctrlr, tr->cid, qpair->id,
 659                     nvme_abort_complete, tr);
 660         } else
 661                 nvme_ctrlr_reset(ctrlr);
 662 }
 663
 664 void
 665 nvme_qpair_submit_tracker(struct nvme_qpair *qpair, struct nvme_tracker *tr)
 666 {
 667         struct nvme_request     *req;
 668         struct nvme_controller  *ctrlr;
 669
 670         mtx_assert(&qpair->lock, MA_OWNED);
 671
 672         req = tr->req;
 673         req->cmd.cid = tr->cid;
 674         qpair->act_tr[tr->cid] = tr;
 675         ctrlr = qpair->ctrlr;
 676
 677         if (req->timeout)
 678 #if __FreeBSD_version >= 800030
 679                 callout_reset_curcpu(&tr->timer, ctrlr->timeout_period * hz,
 680                     nvme_timeout, tr);
 681 #else
 682                 callout_reset(&tr->timer, ctrlr->timeout_period * hz,
 683                     nvme_timeout, tr);
 684 #endif
 685
 686         /* Copy the command from the tracker to the submission queue. */
 687         memcpy(&qpair->cmd[qpair->sq_tail], &req->cmd, sizeof(req->cmd));
 688
 689         if (++qpair->sq_tail == qpair->num_entries)
 690                 qpair->sq_tail = 0;
 691
 692         wmb();
 693         nvme_mmio_write_4(qpair->ctrlr, doorbell[qpair->id].sq_tdbl,
 694             qpair->sq_tail);
 695
 696         qpair->num_cmds++;
 697 }
 698
 699 static void
 700 nvme_payload_map(void *arg, bus_dma_segment_t *seg, int nseg, int error)
 701 {
 702         struct nvme_tracker     *tr = arg;
 703         uint32_t                cur_nseg;
 704
 705         /*
 706          * If the mapping operation failed, return immediately.  The caller
 707          *  is responsible for detecting the error status and failing the
 708          *  tracker manually.
 709          */
 710         if (error != 0)
 711                 return;
 712
 713         /*
 714          * Note that we specified PAGE_SIZE for alignment and max
 715          *  segment size when creating the bus dma tags.  So here
 716          *  we can safely just transfer each segment to its
 717          *  associated PRP entry.
 718          */
 719         tr->req->cmd.prp1 = seg[0].ds_addr;
 720
 721         if (nseg == 2) {
 722                 tr->req->cmd.prp2 = seg[1].ds_addr;
 723         } else if (nseg > 2) {
 724                 cur_nseg = 1;
 725                 tr->req->cmd.prp2 = (uint64_t)tr->prp_bus_addr;
 726                 while (cur_nseg < nseg) {
 727                         tr->prp[cur_nseg-1] =
 728                             (uint64_t)seg[cur_nseg].ds_addr;
 729                         cur_nseg++;
 730                 }
 731         }
 732
 733         nvme_qpair_submit_tracker(tr->qpair, tr);
 734 }
 735
 736 static void
 737 _nvme_qpair_submit_request(struct nvme_qpair *qpair, struct nvme_request *req)
 738 {
 739         struct nvme_tracker     *tr;
 740         int                     err = 0;
 741
 742         mtx_assert(&qpair->lock, MA_OWNED);
 743
 744         tr = TAILQ_FIRST(&qpair->free_tr);
 745         req->qpair = qpair;
 746
 747         if (tr == NULL || !qpair->is_enabled) {
 748                 /*
 749                  * No tracker is available, or the qpair is disabled due to
 750                  *  an in-progress controller-level reset or controller
 751                  *  failure.
 752                  */
 753
 754                 if (qpair->ctrlr->is_failed) {
 755                         /*
 756                          * The controller has failed.  Post the request to a
 757                          *  task where it will be aborted, so that we do not
 758                          *  invoke the request's callback in the context
 759                          *  of the submission.
 760                          */
 761                         nvme_ctrlr_post_failed_request(qpair->ctrlr, req);
 762                 } else {
 763                         /*
 764                          * Put the request on the qpair's request queue to be
 765                          *  processed when a tracker frees up via a command
 766                          *  completion or when the controller reset is
 767                          *  completed.
 768                          */
 769                         STAILQ_INSERT_TAIL(&qpair->queued_req, req, stailq);
 770                 }
 771                 return;
 772         }
 773
 774         TAILQ_REMOVE(&qpair->free_tr, tr, tailq);
 775         TAILQ_INSERT_TAIL(&qpair->outstanding_tr, tr, tailq);
 776         tr->req = req;
 777
 778         switch (req->type) {
 779         case NVME_REQUEST_VADDR:
 780                 KASSERT(req->payload_size <= qpair->ctrlr->max_xfer_size,
 781                     ("payload_size (%d) exceeds max_xfer_size (%d)\n",
 782                     req->payload_size, qpair->ctrlr->max_xfer_size));
 783                 err = bus_dmamap_load(tr->qpair->dma_tag, tr->payload_dma_map,
 784                     req->u.payload, req->payload_size, nvme_payload_map, tr, 0);
 785                 if (err != 0)
 786                         nvme_printf(qpair->ctrlr,
 787                             "bus_dmamap_load returned 0x%x!\n", err);
 788                 break;
 789         case NVME_REQUEST_NULL:
 790                 nvme_qpair_submit_tracker(tr->qpair, tr);
 791                 break;
 792 #ifdef NVME_UNMAPPED_BIO_SUPPORT
 793         case NVME_REQUEST_BIO:
 794                 KASSERT(req->u.bio->bio_bcount <= qpair->ctrlr->max_xfer_size,
 795                     ("bio->bio_bcount (%jd) exceeds max_xfer_size (%d)\n",
 796                     (intmax_t)req->u.bio->bio_bcount,
 797                     qpair->ctrlr->max_xfer_size));
 798                 err = bus_dmamap_load_bio(tr->qpair->dma_tag,
 799                     tr->payload_dma_map, req->u.bio, nvme_payload_map, tr, 0);
 800                 if (err != 0)
 801                         nvme_printf(qpair->ctrlr,
 802                             "bus_dmamap_load_bio returned 0x%x!\n", err);
 803                 break;
 804 #endif
 805         default:
 806                 panic("unknown nvme request type 0x%x\n", req->type);
 807                 break;
 808         }
 809
 810         if (err != 0) {
 811                 /*
 812                  * The dmamap operation failed, so we manually fail the
 813                  *  tracker here with DATA_TRANSFER_ERROR status.
 814                  *
 815                  * nvme_qpair_manual_complete_tracker must not be called
 816                  *  with the qpair lock held.
 817                  */
 818                 mtx_unlock(&qpair->lock);
 819                 nvme_qpair_manual_complete_tracker(qpair, tr, NVME_SCT_GENERIC,
 820                     NVME_SC_DATA_TRANSFER_ERROR, 1 /* do not retry */, TRUE);
 821                 mtx_lock(&qpair->lock);
 822         }
 823 }
 824
 825 void
 826 nvme_qpair_submit_request(struct nvme_qpair *qpair, struct nvme_request *req)
 827 {
 828
 829         mtx_lock(&qpair->lock);
 830         _nvme_qpair_submit_request(qpair, req);
 831         mtx_unlock(&qpair->lock);
 832 }
 833
 834 static void
 835 nvme_qpair_enable(struct nvme_qpair *qpair)
 836 {
 837
 838         qpair->is_enabled = TRUE;
 839 }
 840
 841 void
 842 nvme_qpair_reset(struct nvme_qpair *qpair)
 843 {
 844
 845         qpair->sq_head = qpair->sq_tail = qpair->cq_head = 0;
 846
 847         /*
 848          * First time through the completion queue, HW will set phase
 849          *  bit on completions to 1.  So set this to 1 here, indicating
 850          *  we're looking for a 1 to know which entries have completed.
 851          *  we'll toggle the bit each time when the completion queue
 852          *  rolls over.
 853          */
 854         qpair->phase = 1;
 855
 856         memset(qpair->cmd, 0,
 857             qpair->num_entries * sizeof(struct nvme_command));
 858         memset(qpair->cpl, 0,
 859             qpair->num_entries * sizeof(struct nvme_completion));
 860 }
 861
 862 void
 863 nvme_admin_qpair_enable(struct nvme_qpair *qpair)
 864 {
 865         struct nvme_tracker             *tr;
 866         struct nvme_tracker             *tr_temp;
 867
 868         /*
 869          * Manually abort each outstanding admin command.  Do not retry
 870          *  admin commands found here, since they will be left over from
 871          *  a controller reset and its likely the context in which the
 872          *  command was issued no longer applies.
 873          */
 874         TAILQ_FOREACH_SAFE(tr, &qpair->outstanding_tr, tailq, tr_temp) {
 875                 nvme_printf(qpair->ctrlr,
 876                     "aborting outstanding admin command\n");
 877                 nvme_qpair_manual_complete_tracker(qpair, tr, NVME_SCT_GENERIC,
 878                     NVME_SC_ABORTED_BY_REQUEST, 1 /* do not retry */, TRUE);
 879         }
 880
 881         nvme_qpair_enable(qpair);
 882 }
 883
 884 void
 885 nvme_io_qpair_enable(struct nvme_qpair *qpair)
 886 {
 887         STAILQ_HEAD(, nvme_request)     temp;
 888         struct nvme_tracker             *tr;
 889         struct nvme_tracker             *tr_temp;
 890         struct nvme_request             *req;
 891
 892         /*
 893          * Manually abort each outstanding I/O.  This normally results in a
 894          *  retry, unless the retry count on the associated request has
 895          *  reached its limit.
 896          */
 897         TAILQ_FOREACH_SAFE(tr, &qpair->outstanding_tr, tailq, tr_temp) {
 898                 nvme_printf(qpair->ctrlr, "aborting outstanding i/o\n");
 899                 nvme_qpair_manual_complete_tracker(qpair, tr, NVME_SCT_GENERIC,
 900                     NVME_SC_ABORTED_BY_REQUEST, 0, TRUE);
 901         }
 902
 903         mtx_lock(&qpair->lock);
 904
 905         nvme_qpair_enable(qpair);
 906
 907         STAILQ_INIT(&temp);
 908         STAILQ_SWAP(&qpair->queued_req, &temp, nvme_request);
 909
 910         while (!STAILQ_EMPTY(&temp)) {
 911                 req = STAILQ_FIRST(&temp);
 912                 STAILQ_REMOVE_HEAD(&temp, stailq);
 913                 nvme_printf(qpair->ctrlr, "resubmitting queued i/o\n");
 914                 nvme_qpair_print_command(qpair, &req->cmd);
 915                 _nvme_qpair_submit_request(qpair, req);
 916         }
 917
 918         mtx_unlock(&qpair->lock);
 919 }
 920
 921 static void
 922 nvme_qpair_disable(struct nvme_qpair *qpair)
 923 {
 924         struct nvme_tracker *tr;
 925
 926         qpair->is_enabled = FALSE;
 927         mtx_lock(&qpair->lock);
 928         TAILQ_FOREACH(tr, &qpair->outstanding_tr, tailq)
 929                 callout_stop(&tr->timer);
 930         mtx_unlock(&qpair->lock);
 931 }
 932
 933 void
 934 nvme_admin_qpair_disable(struct nvme_qpair *qpair)
 935 {
 936
 937         nvme_qpair_disable(qpair);
 938         nvme_admin_qpair_abort_aers(qpair);
 939 }
 940
 941 void
 942 nvme_io_qpair_disable(struct nvme_qpair *qpair)
 943 {
 944
 945         nvme_qpair_disable(qpair);
 946 }
 947
 948 void
 949 nvme_qpair_fail(struct nvme_qpair *qpair)
 950 {
 951         struct nvme_tracker             *tr;
 952         struct nvme_request             *req;
 953
 954         mtx_lock(&qpair->lock);
 955
 956         while (!STAILQ_EMPTY(&qpair->queued_req)) {
 957                 req = STAILQ_FIRST(&qpair->queued_req);
 958                 STAILQ_REMOVE_HEAD(&qpair->queued_req, stailq);
 959                 nvme_printf(qpair->ctrlr, "failing queued i/o\n");
 960                 mtx_unlock(&qpair->lock);
 961                 nvme_qpair_manual_complete_request(qpair, req, NVME_SCT_GENERIC,
 962                     NVME_SC_ABORTED_BY_REQUEST, TRUE);
 963                 mtx_lock(&qpair->lock);
 964         }
 965
 966         /* Manually abort each outstanding I/O. */
 967         while (!TAILQ_EMPTY(&qpair->outstanding_tr)) {
 968                 tr = TAILQ_FIRST(&qpair->outstanding_tr);
 969                 /*
 970                  * Do not remove the tracker.  The abort_tracker path will
 971                  *  do that for us.
 972                  */
 973                 nvme_printf(qpair->ctrlr, "failing outstanding i/o\n");
 974                 mtx_unlock(&qpair->lock);
 975                 nvme_qpair_manual_complete_tracker(qpair, tr, NVME_SCT_GENERIC,
 976                     NVME_SC_ABORTED_BY_REQUEST, 1 /* do not retry */, TRUE);
 977                 mtx_lock(&qpair->lock);
 978         }
 979
 980         mtx_unlock(&qpair->lock);
 981 }
 982