sys/dev/nvme/nvme_qpair.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (C) 2012-2014 Intel Corporation
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/bus.h>
  34 #include <sys/conf.h>
  35 #include <sys/domainset.h>
  36 #include <sys/proc.h>
  37
  38 #include <dev/pci/pcivar.h>
  39
  40 #include "nvme_private.h"
  41
  42 typedef enum error_print { ERROR_PRINT_NONE, ERROR_PRINT_NO_RETRY, ERROR_PRINT_ALL } error_print_t;
  43 #define DO_NOT_RETRY    1
  44
  45 static void     _nvme_qpair_submit_request(struct nvme_qpair *qpair,
  46                                            struct nvme_request *req);
  47 static void     nvme_qpair_destroy(struct nvme_qpair *qpair);
  48
  49 struct nvme_opcode_string {
  50         uint16_t        opc;
  51         const char *    str;
  52 };
  53
  54 static struct nvme_opcode_string admin_opcode[] = {
  55         { NVME_OPC_DELETE_IO_SQ, "DELETE IO SQ" },
  56         { NVME_OPC_CREATE_IO_SQ, "CREATE IO SQ" },
  57         { NVME_OPC_GET_LOG_PAGE, "GET LOG PAGE" },
  58         { NVME_OPC_DELETE_IO_CQ, "DELETE IO CQ" },
  59         { NVME_OPC_CREATE_IO_CQ, "CREATE IO CQ" },
  60         { NVME_OPC_IDENTIFY, "IDENTIFY" },
  61         { NVME_OPC_ABORT, "ABORT" },
  62         { NVME_OPC_SET_FEATURES, "SET FEATURES" },
  63         { NVME_OPC_GET_FEATURES, "GET FEATURES" },
  64         { NVME_OPC_ASYNC_EVENT_REQUEST, "ASYNC EVENT REQUEST" },
  65         { NVME_OPC_FIRMWARE_ACTIVATE, "FIRMWARE ACTIVATE" },
  66         { NVME_OPC_FIRMWARE_IMAGE_DOWNLOAD, "FIRMWARE IMAGE DOWNLOAD" },
  67         { NVME_OPC_DEVICE_SELF_TEST, "DEVICE SELF-TEST" },
  68         { NVME_OPC_NAMESPACE_ATTACHMENT, "NAMESPACE ATTACHMENT" },
  69         { NVME_OPC_KEEP_ALIVE, "KEEP ALIVE" },
  70         { NVME_OPC_DIRECTIVE_SEND, "DIRECTIVE SEND" },
  71         { NVME_OPC_DIRECTIVE_RECEIVE, "DIRECTIVE RECEIVE" },
  72         { NVME_OPC_VIRTUALIZATION_MANAGEMENT, "VIRTUALIZATION MANAGEMENT" },
  73         { NVME_OPC_NVME_MI_SEND, "NVME-MI SEND" },
  74         { NVME_OPC_NVME_MI_RECEIVE, "NVME-MI RECEIVE" },
  75         { NVME_OPC_DOORBELL_BUFFER_CONFIG, "DOORBELL BUFFER CONFIG" },
  76         { NVME_OPC_FORMAT_NVM, "FORMAT NVM" },
  77         { NVME_OPC_SECURITY_SEND, "SECURITY SEND" },
  78         { NVME_OPC_SECURITY_RECEIVE, "SECURITY RECEIVE" },
  79         { NVME_OPC_SANITIZE, "SANITIZE" },
  80         { NVME_OPC_GET_LBA_STATUS, "GET LBA STATUS" },
  81         { 0xFFFF, "ADMIN COMMAND" }
  82 };
  83
  84 static struct nvme_opcode_string io_opcode[] = {
  85         { NVME_OPC_FLUSH, "FLUSH" },
  86         { NVME_OPC_WRITE, "WRITE" },
  87         { NVME_OPC_READ, "READ" },
  88         { NVME_OPC_WRITE_UNCORRECTABLE, "WRITE UNCORRECTABLE" },
  89         { NVME_OPC_COMPARE, "COMPARE" },
  90         { NVME_OPC_WRITE_ZEROES, "WRITE ZEROES" },
  91         { NVME_OPC_DATASET_MANAGEMENT, "DATASET MANAGEMENT" },
  92         { NVME_OPC_VERIFY, "VERIFY" },
  93         { NVME_OPC_RESERVATION_REGISTER, "RESERVATION REGISTER" },
  94         { NVME_OPC_RESERVATION_REPORT, "RESERVATION REPORT" },
  95         { NVME_OPC_RESERVATION_ACQUIRE, "RESERVATION ACQUIRE" },
  96         { NVME_OPC_RESERVATION_RELEASE, "RESERVATION RELEASE" },
  97         { 0xFFFF, "IO COMMAND" }
  98 };
  99
 100 static const char *
 101 get_admin_opcode_string(uint16_t opc)
 102 {
 103         struct nvme_opcode_string *entry;
 104
 105         entry = admin_opcode;
 106
 107         while (entry->opc != 0xFFFF) {
 108                 if (entry->opc == opc)
 109                         return (entry->str);
 110                 entry++;
 111         }
 112         return (entry->str);
 113 }
 114
 115 static const char *
 116 get_io_opcode_string(uint16_t opc)
 117 {
 118         struct nvme_opcode_string *entry;
 119
 120         entry = io_opcode;
 121
 122         while (entry->opc != 0xFFFF) {
 123                 if (entry->opc == opc)
 124                         return (entry->str);
 125                 entry++;
 126         }
 127         return (entry->str);
 128 }
 129
 130 static void
 131 nvme_admin_qpair_print_command(struct nvme_qpair *qpair,
 132     struct nvme_command *cmd)
 133 {
 134
 135         nvme_printf(qpair->ctrlr, "%s (%02x) sqid:%d cid:%d nsid:%x "
 136             "cdw10:%08x cdw11:%08x\n",
 137             get_admin_opcode_string(cmd->opc), cmd->opc, qpair->id, cmd->cid,
 138             le32toh(cmd->nsid), le32toh(cmd->cdw10), le32toh(cmd->cdw11));
 139 }
 140
 141 static void
 142 nvme_io_qpair_print_command(struct nvme_qpair *qpair,
 143     struct nvme_command *cmd)
 144 {
 145
 146         switch (cmd->opc) {
 147         case NVME_OPC_WRITE:
 148         case NVME_OPC_READ:
 149         case NVME_OPC_WRITE_UNCORRECTABLE:
 150         case NVME_OPC_COMPARE:
 151         case NVME_OPC_WRITE_ZEROES:
 152         case NVME_OPC_VERIFY:
 153                 nvme_printf(qpair->ctrlr, "%s sqid:%d cid:%d nsid:%d "
 154                     "lba:%llu len:%d\n",
 155                     get_io_opcode_string(cmd->opc), qpair->id, cmd->cid, le32toh(cmd->nsid),
 156                     ((unsigned long long)le32toh(cmd->cdw11) << 32) + le32toh(cmd->cdw10),
 157                     (le32toh(cmd->cdw12) & 0xFFFF) + 1);
 158                 break;
 159         case NVME_OPC_FLUSH:
 160         case NVME_OPC_DATASET_MANAGEMENT:
 161         case NVME_OPC_RESERVATION_REGISTER:
 162         case NVME_OPC_RESERVATION_REPORT:
 163         case NVME_OPC_RESERVATION_ACQUIRE:
 164         case NVME_OPC_RESERVATION_RELEASE:
 165                 nvme_printf(qpair->ctrlr, "%s sqid:%d cid:%d nsid:%d\n",
 166                     get_io_opcode_string(cmd->opc), qpair->id, cmd->cid, le32toh(cmd->nsid));
 167                 break;
 168         default:
 169                 nvme_printf(qpair->ctrlr, "%s (%02x) sqid:%d cid:%d nsid:%d\n",
 170                     get_io_opcode_string(cmd->opc), cmd->opc, qpair->id,
 171                     cmd->cid, le32toh(cmd->nsid));
 172                 break;
 173         }
 174 }
 175
 176 static void
 177 nvme_qpair_print_command(struct nvme_qpair *qpair, struct nvme_command *cmd)
 178 {
 179         if (qpair->id == 0)
 180                 nvme_admin_qpair_print_command(qpair, cmd);
 181         else
 182                 nvme_io_qpair_print_command(qpair, cmd);
 183         if (nvme_verbose_cmd_dump) {
 184                 nvme_printf(qpair->ctrlr,
 185                     "nsid:%#x rsvd2:%#x rsvd3:%#x mptr:%#jx prp1:%#jx prp2:%#jx\n",
 186                     cmd->nsid, cmd->rsvd2, cmd->rsvd3, (uintmax_t)cmd->mptr,
 187                     (uintmax_t)cmd->prp1, (uintmax_t)cmd->prp2);
 188                 nvme_printf(qpair->ctrlr,
 189                     "cdw10: %#x cdw11:%#x cdw12:%#x cdw13:%#x cdw14:%#x cdw15:%#x\n",
 190                     cmd->cdw10, cmd->cdw11, cmd->cdw12, cmd->cdw13, cmd->cdw14,
 191                     cmd->cdw15);
 192         }
 193 }
 194
 195 struct nvme_status_string {
 196         uint16_t        sc;
 197         const char *    str;
 198 };
 199
 200 static struct nvme_status_string generic_status[] = {
 201         { NVME_SC_SUCCESS, "SUCCESS" },
 202         { NVME_SC_INVALID_OPCODE, "INVALID OPCODE" },
 203         { NVME_SC_INVALID_FIELD, "INVALID_FIELD" },
 204         { NVME_SC_COMMAND_ID_CONFLICT, "COMMAND ID CONFLICT" },
 205         { NVME_SC_DATA_TRANSFER_ERROR, "DATA TRANSFER ERROR" },
 206         { NVME_SC_ABORTED_POWER_LOSS, "ABORTED - POWER LOSS" },
 207         { NVME_SC_INTERNAL_DEVICE_ERROR, "INTERNAL DEVICE ERROR" },
 208         { NVME_SC_ABORTED_BY_REQUEST, "ABORTED - BY REQUEST" },
 209         { NVME_SC_ABORTED_SQ_DELETION, "ABORTED - SQ DELETION" },
 210         { NVME_SC_ABORTED_FAILED_FUSED, "ABORTED - FAILED FUSED" },
 211         { NVME_SC_ABORTED_MISSING_FUSED, "ABORTED - MISSING FUSED" },
 212         { NVME_SC_INVALID_NAMESPACE_OR_FORMAT, "INVALID NAMESPACE OR FORMAT" },
 213         { NVME_SC_COMMAND_SEQUENCE_ERROR, "COMMAND SEQUENCE ERROR" },
 214         { NVME_SC_INVALID_SGL_SEGMENT_DESCR, "INVALID SGL SEGMENT DESCRIPTOR" },
 215         { NVME_SC_INVALID_NUMBER_OF_SGL_DESCR, "INVALID NUMBER OF SGL DESCRIPTORS" },
 216         { NVME_SC_DATA_SGL_LENGTH_INVALID, "DATA SGL LENGTH INVALID" },
 217         { NVME_SC_METADATA_SGL_LENGTH_INVALID, "METADATA SGL LENGTH INVALID" },
 218         { NVME_SC_SGL_DESCRIPTOR_TYPE_INVALID, "SGL DESCRIPTOR TYPE INVALID" },
 219         { NVME_SC_INVALID_USE_OF_CMB, "INVALID USE OF CONTROLLER MEMORY BUFFER" },
 220         { NVME_SC_PRP_OFFET_INVALID, "PRP OFFET INVALID" },
 221         { NVME_SC_ATOMIC_WRITE_UNIT_EXCEEDED, "ATOMIC WRITE UNIT EXCEEDED" },
 222         { NVME_SC_OPERATION_DENIED, "OPERATION DENIED" },
 223         { NVME_SC_SGL_OFFSET_INVALID, "SGL OFFSET INVALID" },
 224         { NVME_SC_HOST_ID_INCONSISTENT_FORMAT, "HOST IDENTIFIER INCONSISTENT FORMAT" },
 225         { NVME_SC_KEEP_ALIVE_TIMEOUT_EXPIRED, "KEEP ALIVE TIMEOUT EXPIRED" },
 226         { NVME_SC_KEEP_ALIVE_TIMEOUT_INVALID, "KEEP ALIVE TIMEOUT INVALID" },
 227         { NVME_SC_ABORTED_DUE_TO_PREEMPT, "COMMAND ABORTED DUE TO PREEMPT AND ABORT" },
 228         { NVME_SC_SANITIZE_FAILED, "SANITIZE FAILED" },
 229         { NVME_SC_SANITIZE_IN_PROGRESS, "SANITIZE IN PROGRESS" },
 230         { NVME_SC_SGL_DATA_BLOCK_GRAN_INVALID, "SGL_DATA_BLOCK_GRANULARITY_INVALID" },
 231         { NVME_SC_NOT_SUPPORTED_IN_CMB, "COMMAND NOT SUPPORTED FOR QUEUE IN CMB" },
 232         { NVME_SC_NAMESPACE_IS_WRITE_PROTECTED, "NAMESPACE IS WRITE PROTECTED" },
 233         { NVME_SC_COMMAND_INTERRUPTED, "COMMAND INTERRUPTED" },
 234         { NVME_SC_TRANSIENT_TRANSPORT_ERROR, "TRANSIENT TRANSPORT ERROR" },
 235
 236         { NVME_SC_LBA_OUT_OF_RANGE, "LBA OUT OF RANGE" },
 237         { NVME_SC_CAPACITY_EXCEEDED, "CAPACITY EXCEEDED" },
 238         { NVME_SC_NAMESPACE_NOT_READY, "NAMESPACE NOT READY" },
 239         { NVME_SC_RESERVATION_CONFLICT, "RESERVATION CONFLICT" },
 240         { NVME_SC_FORMAT_IN_PROGRESS, "FORMAT IN PROGRESS" },
 241         { 0xFFFF, "GENERIC" }
 242 };
 243
 244 static struct nvme_status_string command_specific_status[] = {
 245         { NVME_SC_COMPLETION_QUEUE_INVALID, "INVALID COMPLETION QUEUE" },
 246         { NVME_SC_INVALID_QUEUE_IDENTIFIER, "INVALID QUEUE IDENTIFIER" },
 247         { NVME_SC_MAXIMUM_QUEUE_SIZE_EXCEEDED, "MAX QUEUE SIZE EXCEEDED" },
 248         { NVME_SC_ABORT_COMMAND_LIMIT_EXCEEDED, "ABORT CMD LIMIT EXCEEDED" },
 249         { NVME_SC_ASYNC_EVENT_REQUEST_LIMIT_EXCEEDED, "ASYNC LIMIT EXCEEDED" },
 250         { NVME_SC_INVALID_FIRMWARE_SLOT, "INVALID FIRMWARE SLOT" },
 251         { NVME_SC_INVALID_FIRMWARE_IMAGE, "INVALID FIRMWARE IMAGE" },
 252         { NVME_SC_INVALID_INTERRUPT_VECTOR, "INVALID INTERRUPT VECTOR" },
 253         { NVME_SC_INVALID_LOG_PAGE, "INVALID LOG PAGE" },
 254         { NVME_SC_INVALID_FORMAT, "INVALID FORMAT" },
 255         { NVME_SC_FIRMWARE_REQUIRES_RESET, "FIRMWARE REQUIRES RESET" },
 256         { NVME_SC_INVALID_QUEUE_DELETION, "INVALID QUEUE DELETION" },
 257         { NVME_SC_FEATURE_NOT_SAVEABLE, "FEATURE IDENTIFIER NOT SAVEABLE" },
 258         { NVME_SC_FEATURE_NOT_CHANGEABLE, "FEATURE NOT CHANGEABLE" },
 259         { NVME_SC_FEATURE_NOT_NS_SPECIFIC, "FEATURE NOT NAMESPACE SPECIFIC" },
 260         { NVME_SC_FW_ACT_REQUIRES_NVMS_RESET, "FIRMWARE ACTIVATION REQUIRES NVM SUBSYSTEM RESET" },
 261         { NVME_SC_FW_ACT_REQUIRES_RESET, "FIRMWARE ACTIVATION REQUIRES RESET" },
 262         { NVME_SC_FW_ACT_REQUIRES_TIME, "FIRMWARE ACTIVATION REQUIRES MAXIMUM TIME VIOLATION" },
 263         { NVME_SC_FW_ACT_PROHIBITED, "FIRMWARE ACTIVATION PROHIBITED" },
 264         { NVME_SC_OVERLAPPING_RANGE, "OVERLAPPING RANGE" },
 265         { NVME_SC_NS_INSUFFICIENT_CAPACITY, "NAMESPACE INSUFFICIENT CAPACITY" },
 266         { NVME_SC_NS_ID_UNAVAILABLE, "NAMESPACE IDENTIFIER UNAVAILABLE" },
 267         { NVME_SC_NS_ALREADY_ATTACHED, "NAMESPACE ALREADY ATTACHED" },
 268         { NVME_SC_NS_IS_PRIVATE, "NAMESPACE IS PRIVATE" },
 269         { NVME_SC_NS_NOT_ATTACHED, "NS NOT ATTACHED" },
 270         { NVME_SC_THIN_PROV_NOT_SUPPORTED, "THIN PROVISIONING NOT SUPPORTED" },
 271         { NVME_SC_CTRLR_LIST_INVALID, "CONTROLLER LIST INVALID" },
 272         { NVME_SC_SELF_TEST_IN_PROGRESS, "DEVICE SELF-TEST IN PROGRESS" },
 273         { NVME_SC_BOOT_PART_WRITE_PROHIB, "BOOT PARTITION WRITE PROHIBITED" },
 274         { NVME_SC_INVALID_CTRLR_ID, "INVALID CONTROLLER IDENTIFIER" },
 275         { NVME_SC_INVALID_SEC_CTRLR_STATE, "INVALID SECONDARY CONTROLLER STATE" },
 276         { NVME_SC_INVALID_NUM_OF_CTRLR_RESRC, "INVALID NUMBER OF CONTROLLER RESOURCES" },
 277         { NVME_SC_INVALID_RESOURCE_ID, "INVALID RESOURCE IDENTIFIER" },
 278         { NVME_SC_SANITIZE_PROHIBITED_WPMRE, "SANITIZE PROHIBITED WRITE PERSISTENT MEMORY REGION ENABLED" },
 279         { NVME_SC_ANA_GROUP_ID_INVALID, "ANA GROUP IDENTIFIED INVALID" },
 280         { NVME_SC_ANA_ATTACH_FAILED, "ANA ATTACH FAILED" },
 281
 282         { NVME_SC_CONFLICTING_ATTRIBUTES, "CONFLICTING ATTRIBUTES" },
 283         { NVME_SC_INVALID_PROTECTION_INFO, "INVALID PROTECTION INFO" },
 284         { NVME_SC_ATTEMPTED_WRITE_TO_RO_PAGE, "WRITE TO RO PAGE" },
 285         { 0xFFFF, "COMMAND SPECIFIC" }
 286 };
 287
 288 static struct nvme_status_string media_error_status[] = {
 289         { NVME_SC_WRITE_FAULTS, "WRITE FAULTS" },
 290         { NVME_SC_UNRECOVERED_READ_ERROR, "UNRECOVERED READ ERROR" },
 291         { NVME_SC_GUARD_CHECK_ERROR, "GUARD CHECK ERROR" },
 292         { NVME_SC_APPLICATION_TAG_CHECK_ERROR, "APPLICATION TAG CHECK ERROR" },
 293         { NVME_SC_REFERENCE_TAG_CHECK_ERROR, "REFERENCE TAG CHECK ERROR" },
 294         { NVME_SC_COMPARE_FAILURE, "COMPARE FAILURE" },
 295         { NVME_SC_ACCESS_DENIED, "ACCESS DENIED" },
 296         { NVME_SC_DEALLOCATED_OR_UNWRITTEN, "DEALLOCATED OR UNWRITTEN LOGICAL BLOCK" },
 297         { 0xFFFF, "MEDIA ERROR" }
 298 };
 299
 300 static struct nvme_status_string path_related_status[] = {
 301         { NVME_SC_INTERNAL_PATH_ERROR, "INTERNAL PATH ERROR" },
 302         { NVME_SC_ASYMMETRIC_ACCESS_PERSISTENT_LOSS, "ASYMMETRIC ACCESS PERSISTENT LOSS" },
 303         { NVME_SC_ASYMMETRIC_ACCESS_INACCESSIBLE, "ASYMMETRIC ACCESS INACCESSIBLE" },
 304         { NVME_SC_ASYMMETRIC_ACCESS_TRANSITION, "ASYMMETRIC ACCESS TRANSITION" },
 305         { NVME_SC_CONTROLLER_PATHING_ERROR, "CONTROLLER PATHING ERROR" },
 306         { NVME_SC_HOST_PATHING_ERROR, "HOST PATHING ERROR" },
 307         { NVME_SC_COMMAND_ABOTHED_BY_HOST, "COMMAND ABOTHED BY HOST" },
 308         { 0xFFFF, "PATH RELATED" },
 309 };
 310
 311 static const char *
 312 get_status_string(uint16_t sct, uint16_t sc)
 313 {
 314         struct nvme_status_string *entry;
 315
 316         switch (sct) {
 317         case NVME_SCT_GENERIC:
 318                 entry = generic_status;
 319                 break;
 320         case NVME_SCT_COMMAND_SPECIFIC:
 321                 entry = command_specific_status;
 322                 break;
 323         case NVME_SCT_MEDIA_ERROR:
 324                 entry = media_error_status;
 325                 break;
 326         case NVME_SCT_PATH_RELATED:
 327                 entry = path_related_status;
 328                 break;
 329         case NVME_SCT_VENDOR_SPECIFIC:
 330                 return ("VENDOR SPECIFIC");
 331         default:
 332                 return ("RESERVED");
 333         }
 334
 335         while (entry->sc != 0xFFFF) {
 336                 if (entry->sc == sc)
 337                         return (entry->str);
 338                 entry++;
 339         }
 340         return (entry->str);
 341 }
 342
 343 static void
 344 nvme_qpair_print_completion(struct nvme_qpair *qpair,
 345     struct nvme_completion *cpl)
 346 {
 347         uint16_t sct, sc;
 348
 349         sct = NVME_STATUS_GET_SCT(cpl->status);
 350         sc = NVME_STATUS_GET_SC(cpl->status);
 351
 352         nvme_printf(qpair->ctrlr, "%s (%02x/%02x) sqid:%d cid:%d cdw0:%x\n",
 353             get_status_string(sct, sc), sct, sc, cpl->sqid, cpl->cid,
 354             cpl->cdw0);
 355 }
 356
 357 static bool
 358 nvme_completion_is_retry(const struct nvme_completion *cpl)
 359 {
 360         uint8_t sct, sc, dnr;
 361
 362         sct = NVME_STATUS_GET_SCT(cpl->status);
 363         sc = NVME_STATUS_GET_SC(cpl->status);
 364         dnr = NVME_STATUS_GET_DNR(cpl->status); /* Do Not Retry Bit */
 365
 366         /*
 367          * TODO: spec is not clear how commands that are aborted due
 368          *  to TLER will be marked.  So for now, it seems
 369          *  NAMESPACE_NOT_READY is the only case where we should
 370          *  look at the DNR bit. Requests failed with ABORTED_BY_REQUEST
 371          *  set the DNR bit correctly since the driver controls that.
 372          */
 373         switch (sct) {
 374         case NVME_SCT_GENERIC:
 375                 switch (sc) {
 376                 case NVME_SC_ABORTED_BY_REQUEST:
 377                 case NVME_SC_NAMESPACE_NOT_READY:
 378                         if (dnr)
 379                                 return (0);
 380                         else
 381                                 return (1);
 382                 case NVME_SC_INVALID_OPCODE:
 383                 case NVME_SC_INVALID_FIELD:
 384                 case NVME_SC_COMMAND_ID_CONFLICT:
 385                 case NVME_SC_DATA_TRANSFER_ERROR:
 386                 case NVME_SC_ABORTED_POWER_LOSS:
 387                 case NVME_SC_INTERNAL_DEVICE_ERROR:
 388                 case NVME_SC_ABORTED_SQ_DELETION:
 389                 case NVME_SC_ABORTED_FAILED_FUSED:
 390                 case NVME_SC_ABORTED_MISSING_FUSED:
 391                 case NVME_SC_INVALID_NAMESPACE_OR_FORMAT:
 392                 case NVME_SC_COMMAND_SEQUENCE_ERROR:
 393                 case NVME_SC_LBA_OUT_OF_RANGE:
 394                 case NVME_SC_CAPACITY_EXCEEDED:
 395                 default:
 396                         return (0);
 397                 }
 398         case NVME_SCT_COMMAND_SPECIFIC:
 399         case NVME_SCT_MEDIA_ERROR:
 400                 return (0);
 401         case NVME_SCT_PATH_RELATED:
 402                 switch (sc) {
 403                 case NVME_SC_INTERNAL_PATH_ERROR:
 404                         if (dnr)
 405                                 return (0);
 406                         else
 407                                 return (1);
 408                 default:
 409                         return (0);
 410                 }
 411         case NVME_SCT_VENDOR_SPECIFIC:
 412         default:
 413                 return (0);
 414         }
 415 }
 416
 417 static void
 418 nvme_qpair_complete_tracker(struct nvme_tracker *tr,
 419     struct nvme_completion *cpl, error_print_t print_on_error)
 420 {
 421         struct nvme_qpair * qpair = tr->qpair;
 422         struct nvme_request     *req;
 423         bool                    retry, error, retriable;
 424
 425         req = tr->req;
 426         error = nvme_completion_is_error(cpl);
 427         retriable = nvme_completion_is_retry(cpl);
 428         retry = error && retriable && req->retries < nvme_retry_count;
 429         if (retry)
 430                 qpair->num_retries++;
 431         if (error && req->retries >= nvme_retry_count && retriable)
 432                 qpair->num_failures++;
 433
 434         if (error && (print_on_error == ERROR_PRINT_ALL ||
 435                 (!retry && print_on_error == ERROR_PRINT_NO_RETRY))) {
 436                 nvme_qpair_print_command(qpair, &req->cmd);
 437                 nvme_qpair_print_completion(qpair, cpl);
 438         }
 439
 440         qpair->act_tr[cpl->cid] = NULL;
 441
 442         KASSERT(cpl->cid == req->cmd.cid, ("cpl cid does not match cmd cid\n"));
 443
 444         if (!retry) {
 445                 if (req->type != NVME_REQUEST_NULL) {
 446                         bus_dmamap_sync(qpair->dma_tag_payload,
 447                             tr->payload_dma_map,
 448                             BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
 449                 }
 450                 if (req->cb_fn)
 451                         req->cb_fn(req->cb_arg, cpl);
 452         }
 453
 454         mtx_lock(&qpair->lock);
 455         callout_stop(&tr->timer);
 456
 457         if (retry) {
 458                 req->retries++;
 459                 nvme_qpair_submit_tracker(qpair, tr);
 460         } else {
 461                 if (req->type != NVME_REQUEST_NULL) {
 462                         bus_dmamap_unload(qpair->dma_tag_payload,
 463                             tr->payload_dma_map);
 464                 }
 465
 466                 nvme_free_request(req);
 467                 tr->req = NULL;
 468
 469                 TAILQ_REMOVE(&qpair->outstanding_tr, tr, tailq);
 470                 TAILQ_INSERT_HEAD(&qpair->free_tr, tr, tailq);
 471
 472                 /*
 473                  * If the controller is in the middle of resetting, don't
 474                  *  try to submit queued requests here - let the reset logic
 475                  *  handle that instead.
 476                  */
 477                 if (!STAILQ_EMPTY(&qpair->queued_req) &&
 478                     !qpair->ctrlr->is_resetting) {
 479                         req = STAILQ_FIRST(&qpair->queued_req);
 480                         STAILQ_REMOVE_HEAD(&qpair->queued_req, stailq);
 481                         _nvme_qpair_submit_request(qpair, req);
 482                 }
 483         }
 484
 485         mtx_unlock(&qpair->lock);
 486 }
 487
 488 static void
 489 nvme_qpair_manual_complete_tracker(
 490     struct nvme_tracker *tr, uint32_t sct, uint32_t sc, uint32_t dnr,
 491     error_print_t print_on_error)
 492 {
 493         struct nvme_completion  cpl;
 494
 495         memset(&cpl, 0, sizeof(cpl));
 496
 497         struct nvme_qpair * qpair = tr->qpair;
 498
 499         cpl.sqid = qpair->id;
 500         cpl.cid = tr->cid;
 501         cpl.status |= (sct & NVME_STATUS_SCT_MASK) << NVME_STATUS_SCT_SHIFT;
 502         cpl.status |= (sc & NVME_STATUS_SC_MASK) << NVME_STATUS_SC_SHIFT;
 503         cpl.status |= (dnr & NVME_STATUS_DNR_MASK) << NVME_STATUS_DNR_SHIFT;
 504         nvme_qpair_complete_tracker(tr, &cpl, print_on_error);
 505 }
 506
 507 void
 508 nvme_qpair_manual_complete_request(struct nvme_qpair *qpair,
 509     struct nvme_request *req, uint32_t sct, uint32_t sc)
 510 {
 511         struct nvme_completion  cpl;
 512         bool                    error;
 513
 514         memset(&cpl, 0, sizeof(cpl));
 515         cpl.sqid = qpair->id;
 516         cpl.status |= (sct & NVME_STATUS_SCT_MASK) << NVME_STATUS_SCT_SHIFT;
 517         cpl.status |= (sc & NVME_STATUS_SC_MASK) << NVME_STATUS_SC_SHIFT;
 518
 519         error = nvme_completion_is_error(&cpl);
 520
 521         if (error) {
 522                 nvme_qpair_print_command(qpair, &req->cmd);
 523                 nvme_qpair_print_completion(qpair, &cpl);
 524         }
 525
 526         if (req->cb_fn)
 527                 req->cb_fn(req->cb_arg, &cpl);
 528
 529         nvme_free_request(req);
 530 }
 531
 532 bool
 533 nvme_qpair_process_completions(struct nvme_qpair *qpair)
 534 {
 535         struct nvme_tracker     *tr;
 536         struct nvme_completion  cpl;
 537         int done = 0;
 538         bool in_panic = dumping || SCHEDULER_STOPPED();
 539
 540         qpair->num_intr_handler_calls++;
 541
 542         /*
 543          * qpair is not enabled, likely because a controller reset is is in
 544          * progress.  Ignore the interrupt - any I/O that was associated with
 545          * this interrupt will get retried when the reset is complete.
 546          */
 547         if (!qpair->is_enabled)
 548                 return (false);
 549
 550         bus_dmamap_sync(qpair->dma_tag, qpair->queuemem_map,
 551             BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
 552         /*
 553          * A panic can stop the CPU this routine is running on at any point.  If
 554          * we're called during a panic, complete the sq_head wrap protocol for
 555          * the case where we are interrupted just after the increment at 1
 556          * below, but before we can reset cq_head to zero at 2. Also cope with
 557          * the case where we do the zero at 2, but may or may not have done the
 558          * phase adjustment at step 3. The panic machinery flushes all pending
 559          * memory writes, so we can make these strong ordering assumptions
 560          * that would otherwise be unwise if we were racing in real time.
 561          */
 562         if (__predict_false(in_panic)) {
 563                 if (qpair->cq_head == qpair->num_entries) {
 564                         /*
 565                          * Here we know that we need to zero cq_head and then negate
 566                          * the phase, which hasn't been assigned if cq_head isn't
 567                          * zero due to the atomic_store_rel.
 568                          */
 569                         qpair->cq_head = 0;
 570                         qpair->phase = !qpair->phase;
 571                 } else if (qpair->cq_head == 0) {
 572                         /*
 573                          * In this case, we know that the assignment at 2
 574                          * happened below, but we don't know if it 3 happened or
 575                          * not. To do this, we look at the last completion
 576                          * entry and set the phase to the opposite phase
 577                          * that it has. This gets us back in sync
 578                          */
 579                         cpl = qpair->cpl[qpair->num_entries - 1];
 580                         nvme_completion_swapbytes(&cpl);
 581                         qpair->phase = !NVME_STATUS_GET_P(cpl.status);
 582                 }
 583         }
 584
 585         while (1) {
 586                 cpl = qpair->cpl[qpair->cq_head];
 587
 588                 /* Convert to host endian */
 589                 nvme_completion_swapbytes(&cpl);
 590
 591                 if (NVME_STATUS_GET_P(cpl.status) != qpair->phase)
 592                         break;
 593
 594                 tr = qpair->act_tr[cpl.cid];
 595
 596                 if (tr != NULL) {
 597                         nvme_qpair_complete_tracker(tr, &cpl, ERROR_PRINT_ALL);
 598                         qpair->sq_head = cpl.sqhd;
 599                         done++;
 600                 } else if (!in_panic) {
 601                         /*
 602                          * A missing tracker is normally an error.  However, a
 603                          * panic can stop the CPU this routine is running on
 604                          * after completing an I/O but before updating
 605                          * qpair->cq_head at 1 below.  Later, we re-enter this
 606                          * routine to poll I/O associated with the kernel
 607                          * dump. We find that the tr has been set to null before
 608                          * calling the completion routine.  If it hasn't
 609                          * completed (or it triggers a panic), then '1' below
 610                          * won't have updated cq_head. Rather than panic again,
 611                          * ignore this condition because it's not unexpected.
 612                          */
 613                         nvme_printf(qpair->ctrlr,
 614                             "cpl does not map to outstanding cmd\n");
 615                         /* nvme_dump_completion expects device endianess */
 616                         nvme_dump_completion(&qpair->cpl[qpair->cq_head]);
 617                         KASSERT(0, ("received completion for unknown cmd"));
 618                 }
 619
 620                 /*
 621                  * There's a number of races with the following (see above) when
 622                  * the system panics. We compensate for each one of them by
 623                  * using the atomic store to force strong ordering (at least when
 624                  * viewed in the aftermath of a panic).
 625                  */
 626                 if (++qpair->cq_head == qpair->num_entries) {           /* 1 */
 627                         atomic_store_rel_int(&qpair->cq_head, 0);       /* 2 */
 628                         qpair->phase = !qpair->phase;                   /* 3 */
 629                 }
 630
 631                 bus_space_write_4(qpair->ctrlr->bus_tag, qpair->ctrlr->bus_handle,
 632                     qpair->cq_hdbl_off, qpair->cq_head);
 633         }
 634         return (done != 0);
 635 }
 636
 637 static void
 638 nvme_qpair_msix_handler(void *arg)
 639 {
 640         struct nvme_qpair *qpair = arg;
 641
 642         nvme_qpair_process_completions(qpair);
 643 }
 644
 645 int
 646 nvme_qpair_construct(struct nvme_qpair *qpair,
 647     uint32_t num_entries, uint32_t num_trackers,
 648     struct nvme_controller *ctrlr)
 649 {
 650         struct nvme_tracker     *tr;
 651         size_t                  cmdsz, cplsz, prpsz, allocsz, prpmemsz;
 652         uint64_t                queuemem_phys, prpmem_phys, list_phys;
 653         uint8_t                 *queuemem, *prpmem, *prp_list;
 654         int                     i, err;
 655
 656         qpair->vector = ctrlr->msix_enabled ? qpair->id : 0;
 657         qpair->num_entries = num_entries;
 658         qpair->num_trackers = num_trackers;
 659         qpair->ctrlr = ctrlr;
 660
 661         if (ctrlr->msix_enabled) {
 662                 /*
 663                  * MSI-X vector resource IDs start at 1, so we add one to
 664                  *  the queue's vector to get the corresponding rid to use.
 665                  */
 666                 qpair->rid = qpair->vector + 1;
 667
 668                 qpair->res = bus_alloc_resource_any(ctrlr->dev, SYS_RES_IRQ,
 669                     &qpair->rid, RF_ACTIVE);
 670                 if (bus_setup_intr(ctrlr->dev, qpair->res,
 671                     INTR_TYPE_MISC | INTR_MPSAFE, NULL,
 672                     nvme_qpair_msix_handler, qpair, &qpair->tag) != 0) {
 673                         nvme_printf(ctrlr, "unable to setup intx handler\n");
 674                         goto out;
 675                 }
 676                 if (qpair->id == 0) {
 677                         bus_describe_intr(ctrlr->dev, qpair->res, qpair->tag,
 678                             "admin");
 679                 } else {
 680                         bus_describe_intr(ctrlr->dev, qpair->res, qpair->tag,
 681                             "io%d", qpair->id - 1);
 682                 }
 683         }
 684
 685         mtx_init(&qpair->lock, "nvme qpair lock", NULL, MTX_DEF);
 686
 687         /* Note: NVMe PRP format is restricted to 4-byte alignment. */
 688         err = bus_dma_tag_create(bus_get_dma_tag(ctrlr->dev),
 689             4, PAGE_SIZE, BUS_SPACE_MAXADDR,
 690             BUS_SPACE_MAXADDR, NULL, NULL, ctrlr->max_xfer_size,
 691             btoc(ctrlr->max_xfer_size) + 1, PAGE_SIZE, 0,
 692             NULL, NULL, &qpair->dma_tag_payload);
 693         if (err != 0) {
 694                 nvme_printf(ctrlr, "payload tag create failed %d\n", err);
 695                 goto out;
 696         }
 697
 698         /*
 699          * Each component must be page aligned, and individual PRP lists
 700          * cannot cross a page boundary.
 701          */
 702         cmdsz = qpair->num_entries * sizeof(struct nvme_command);
 703         cmdsz = roundup2(cmdsz, PAGE_SIZE);
 704         cplsz = qpair->num_entries * sizeof(struct nvme_completion);
 705         cplsz = roundup2(cplsz, PAGE_SIZE);
 706         /*
 707          * For commands requiring more than 2 PRP entries, one PRP will be
 708          * embedded in the command (prp1), and the rest of the PRP entries
 709          * will be in a list pointed to by the command (prp2).
 710          */
 711         prpsz = sizeof(uint64_t) * btoc(ctrlr->max_xfer_size);
 712         prpmemsz = qpair->num_trackers * prpsz;
 713         allocsz = cmdsz + cplsz + prpmemsz;
 714
 715         err = bus_dma_tag_create(bus_get_dma_tag(ctrlr->dev),
 716             PAGE_SIZE, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
 717             allocsz, 1, allocsz, 0, NULL, NULL, &qpair->dma_tag);
 718         if (err != 0) {
 719                 nvme_printf(ctrlr, "tag create failed %d\n", err);
 720                 goto out;
 721         }
 722         bus_dma_tag_set_domain(qpair->dma_tag, qpair->domain);
 723
 724         if (bus_dmamem_alloc(qpair->dma_tag, (void **)&queuemem,
 725              BUS_DMA_COHERENT | BUS_DMA_NOWAIT, &qpair->queuemem_map)) {
 726                 nvme_printf(ctrlr, "failed to alloc qpair memory\n");
 727                 goto out;
 728         }
 729
 730         if (bus_dmamap_load(qpair->dma_tag, qpair->queuemem_map,
 731             queuemem, allocsz, nvme_single_map, &queuemem_phys, 0) != 0) {
 732                 nvme_printf(ctrlr, "failed to load qpair memory\n");
 733                 bus_dmamem_free(qpair->dma_tag, qpair->cmd,
 734                     qpair->queuemem_map);
 735                 goto out;
 736         }
 737
 738         qpair->num_cmds = 0;
 739         qpair->num_intr_handler_calls = 0;
 740         qpair->num_retries = 0;
 741         qpair->num_failures = 0;
 742         qpair->cmd = (struct nvme_command *)queuemem;
 743         qpair->cpl = (struct nvme_completion *)(queuemem + cmdsz);
 744         prpmem = (uint8_t *)(queuemem + cmdsz + cplsz);
 745         qpair->cmd_bus_addr = queuemem_phys;
 746         qpair->cpl_bus_addr = queuemem_phys + cmdsz;
 747         prpmem_phys = queuemem_phys + cmdsz + cplsz;
 748
 749         /*
 750          * Calcuate the stride of the doorbell register. Many emulators set this
 751          * value to correspond to a cache line. However, some hardware has set
 752          * it to various small values.
 753          */
 754         qpair->sq_tdbl_off = nvme_mmio_offsetof(doorbell[0]) +
 755             (qpair->id << (ctrlr->dstrd + 1));
 756         qpair->cq_hdbl_off = nvme_mmio_offsetof(doorbell[0]) +
 757             (qpair->id << (ctrlr->dstrd + 1)) + (1 << ctrlr->dstrd);
 758
 759         TAILQ_INIT(&qpair->free_tr);
 760         TAILQ_INIT(&qpair->outstanding_tr);
 761         STAILQ_INIT(&qpair->queued_req);
 762
 763         list_phys = prpmem_phys;
 764         prp_list = prpmem;
 765         for (i = 0; i < qpair->num_trackers; i++) {
 766                 if (list_phys + prpsz > prpmem_phys + prpmemsz) {
 767                         qpair->num_trackers = i;
 768                         break;
 769                 }
 770
 771                 /*
 772                  * Make sure that the PRP list for this tracker doesn't
 773                  * overflow to another page.
 774                  */
 775                 if (trunc_page(list_phys) !=
 776                     trunc_page(list_phys + prpsz - 1)) {
 777                         list_phys = roundup2(list_phys, PAGE_SIZE);
 778                         prp_list =
 779                             (uint8_t *)roundup2((uintptr_t)prp_list, PAGE_SIZE);
 780                 }
 781
 782                 tr = malloc_domainset(sizeof(*tr), M_NVME,
 783                     DOMAINSET_PREF(qpair->domain), M_ZERO | M_WAITOK);
 784                 bus_dmamap_create(qpair->dma_tag_payload, 0,
 785                     &tr->payload_dma_map);
 786                 callout_init(&tr->timer, 1);
 787                 tr->cid = i;
 788                 tr->qpair = qpair;
 789                 tr->prp = (uint64_t *)prp_list;
 790                 tr->prp_bus_addr = list_phys;
 791                 TAILQ_INSERT_HEAD(&qpair->free_tr, tr, tailq);
 792                 list_phys += prpsz;
 793                 prp_list += prpsz;
 794         }
 795
 796         if (qpair->num_trackers == 0) {
 797                 nvme_printf(ctrlr, "failed to allocate enough trackers\n");
 798                 goto out;
 799         }
 800
 801         qpair->act_tr = malloc_domainset(sizeof(struct nvme_tracker *) *
 802             qpair->num_entries, M_NVME, DOMAINSET_PREF(qpair->domain),
 803             M_ZERO | M_WAITOK);
 804         return (0);
 805
 806 out:
 807         nvme_qpair_destroy(qpair);
 808         return (ENOMEM);
 809 }
 810
 811 static void
 812 nvme_qpair_destroy(struct nvme_qpair *qpair)
 813 {
 814         struct nvme_tracker     *tr;
 815
 816         if (qpair->tag) {
 817                 bus_teardown_intr(qpair->ctrlr->dev, qpair->res, qpair->tag);
 818                 qpair->tag = NULL;
 819         }
 820
 821         if (qpair->act_tr) {
 822                 free(qpair->act_tr, M_NVME);
 823                 qpair->act_tr = NULL;
 824         }
 825
 826         while (!TAILQ_EMPTY(&qpair->free_tr)) {
 827                 tr = TAILQ_FIRST(&qpair->free_tr);
 828                 TAILQ_REMOVE(&qpair->free_tr, tr, tailq);
 829                 bus_dmamap_destroy(qpair->dma_tag_payload,
 830                     tr->payload_dma_map);
 831                 free(tr, M_NVME);
 832         }
 833
 834         if (qpair->cmd != NULL) {
 835                 bus_dmamap_unload(qpair->dma_tag, qpair->queuemem_map);
 836                 bus_dmamem_free(qpair->dma_tag, qpair->cmd,
 837                     qpair->queuemem_map);
 838                 qpair->cmd = NULL;
 839         }
 840
 841         if (qpair->dma_tag) {
 842                 bus_dma_tag_destroy(qpair->dma_tag);
 843                 qpair->dma_tag = NULL;
 844         }
 845
 846         if (qpair->dma_tag_payload) {
 847                 bus_dma_tag_destroy(qpair->dma_tag_payload);
 848                 qpair->dma_tag_payload = NULL;
 849         }
 850
 851         if (mtx_initialized(&qpair->lock))
 852                 mtx_destroy(&qpair->lock);
 853
 854         if (qpair->res) {
 855                 bus_release_resource(qpair->ctrlr->dev, SYS_RES_IRQ,
 856                     rman_get_rid(qpair->res), qpair->res);
 857                 qpair->res = NULL;
 858         }
 859 }
 860
 861 static void
 862 nvme_admin_qpair_abort_aers(struct nvme_qpair *qpair)
 863 {
 864         struct nvme_tracker     *tr;
 865
 866         tr = TAILQ_FIRST(&qpair->outstanding_tr);
 867         while (tr != NULL) {
 868                 if (tr->req->cmd.opc == NVME_OPC_ASYNC_EVENT_REQUEST) {
 869                         nvme_qpair_manual_complete_tracker(tr,
 870                             NVME_SCT_GENERIC, NVME_SC_ABORTED_SQ_DELETION, 0,
 871                             ERROR_PRINT_NONE);
 872                         tr = TAILQ_FIRST(&qpair->outstanding_tr);
 873                 } else {
 874                         tr = TAILQ_NEXT(tr, tailq);
 875                 }
 876         }
 877 }
 878
 879 void
 880 nvme_admin_qpair_destroy(struct nvme_qpair *qpair)
 881 {
 882
 883         nvme_admin_qpair_abort_aers(qpair);
 884         nvme_qpair_destroy(qpair);
 885 }
 886
 887 void
 888 nvme_io_qpair_destroy(struct nvme_qpair *qpair)
 889 {
 890
 891         nvme_qpair_destroy(qpair);
 892 }
 893
 894 static void
 895 nvme_abort_complete(void *arg, const struct nvme_completion *status)
 896 {
 897         struct nvme_tracker     *tr = arg;
 898
 899         /*
 900          * If cdw0 == 1, the controller was not able to abort the command
 901          *  we requested.  We still need to check the active tracker array,
 902          *  to cover race where I/O timed out at same time controller was
 903          *  completing the I/O.
 904          */
 905         if (status->cdw0 == 1 && tr->qpair->act_tr[tr->cid] != NULL) {
 906                 /*
 907                  * An I/O has timed out, and the controller was unable to
 908                  *  abort it for some reason.  Construct a fake completion
 909                  *  status, and then complete the I/O's tracker manually.
 910                  */
 911                 nvme_printf(tr->qpair->ctrlr,
 912                     "abort command failed, aborting command manually\n");
 913                 nvme_qpair_manual_complete_tracker(tr,
 914                     NVME_SCT_GENERIC, NVME_SC_ABORTED_BY_REQUEST, 0, ERROR_PRINT_ALL);
 915         }
 916 }
 917
 918 static void
 919 nvme_timeout(void *arg)
 920 {
 921         struct nvme_tracker     *tr = arg;
 922         struct nvme_qpair       *qpair = tr->qpair;
 923         struct nvme_controller  *ctrlr = qpair->ctrlr;
 924         uint32_t                csts;
 925         uint8_t                 cfs;
 926
 927         /*
 928          * Read csts to get value of cfs - controller fatal status.
 929          * If no fatal status, try to call the completion routine, and
 930          * if completes transactions, report a missed interrupt and
 931          * return (this may need to be rate limited). Otherwise, if
 932          * aborts are enabled and the controller is not reporting
 933          * fatal status, abort the command. Otherwise, just reset the
 934          * controller and hope for the best.
 935          */
 936         csts = nvme_mmio_read_4(ctrlr, csts);
 937         cfs = (csts >> NVME_CSTS_REG_CFS_SHIFT) & NVME_CSTS_REG_CFS_MASK;
 938         if (cfs == 0 && nvme_qpair_process_completions(qpair)) {
 939                 nvme_printf(ctrlr, "Missing interrupt\n");
 940                 return;
 941         }
 942         if (ctrlr->enable_aborts && cfs == 0) {
 943                 nvme_printf(ctrlr, "Aborting command due to a timeout.\n");
 944                 nvme_ctrlr_cmd_abort(ctrlr, tr->cid, qpair->id,
 945                     nvme_abort_complete, tr);
 946         } else {
 947                 nvme_printf(ctrlr, "Resetting controller due to a timeout%s.\n",
 948                     (csts == 0xffffffff) ? " and possible hot unplug" :
 949                     (cfs ? " and fatal error status" : ""));
 950                 nvme_ctrlr_reset(ctrlr);
 951         }
 952 }
 953
 954 void
 955 nvme_qpair_submit_tracker(struct nvme_qpair *qpair, struct nvme_tracker *tr)
 956 {
 957         struct nvme_request     *req;
 958         struct nvme_controller  *ctrlr;
 959         int timeout;
 960
 961         mtx_assert(&qpair->lock, MA_OWNED);
 962
 963         req = tr->req;
 964         req->cmd.cid = tr->cid;
 965         qpair->act_tr[tr->cid] = tr;
 966         ctrlr = qpair->ctrlr;
 967
 968         if (req->timeout) {
 969                 if (req->cb_fn == nvme_completion_poll_cb)
 970                         timeout = hz;
 971                 else
 972                         timeout = ctrlr->timeout_period * hz;
 973                 callout_reset_on(&tr->timer, timeout, nvme_timeout, tr,
 974                     qpair->cpu);
 975         }
 976
 977         /* Copy the command from the tracker to the submission queue. */
 978         memcpy(&qpair->cmd[qpair->sq_tail], &req->cmd, sizeof(req->cmd));
 979
 980         if (++qpair->sq_tail == qpair->num_entries)
 981                 qpair->sq_tail = 0;
 982
 983         bus_dmamap_sync(qpair->dma_tag, qpair->queuemem_map,
 984             BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
 985         bus_space_write_4(qpair->ctrlr->bus_tag, qpair->ctrlr->bus_handle,
 986             qpair->sq_tdbl_off, qpair->sq_tail);
 987         qpair->num_cmds++;
 988 }
 989
 990 static void
 991 nvme_payload_map(void *arg, bus_dma_segment_t *seg, int nseg, int error)
 992 {
 993         struct nvme_tracker     *tr = arg;
 994         uint32_t                cur_nseg;
 995
 996         /*
 997          * If the mapping operation failed, return immediately.  The caller
 998          *  is responsible for detecting the error status and failing the
 999          *  tracker manually.
1000          */
1001         if (error != 0) {
1002                 nvme_printf(tr->qpair->ctrlr,
1003                     "nvme_payload_map err %d\n", error);
1004                 return;
1005         }
1006
1007         /*
1008          * Note that we specified PAGE_SIZE for alignment and max
1009          *  segment size when creating the bus dma tags.  So here
1010          *  we can safely just transfer each segment to its
1011          *  associated PRP entry.
1012          */
1013         tr->req->cmd.prp1 = htole64(seg[0].ds_addr);
1014
1015         if (nseg == 2) {
1016                 tr->req->cmd.prp2 = htole64(seg[1].ds_addr);
1017         } else if (nseg > 2) {
1018                 cur_nseg = 1;
1019                 tr->req->cmd.prp2 = htole64((uint64_t)tr->prp_bus_addr);
1020                 while (cur_nseg < nseg) {
1021                         tr->prp[cur_nseg-1] =
1022                             htole64((uint64_t)seg[cur_nseg].ds_addr);
1023                         cur_nseg++;
1024                 }
1025         } else {
1026                 /*
1027                  * prp2 should not be used by the controller
1028                  *  since there is only one segment, but set
1029                  *  to 0 just to be safe.
1030                  */
1031                 tr->req->cmd.prp2 = 0;
1032         }
1033
1034         bus_dmamap_sync(tr->qpair->dma_tag_payload, tr->payload_dma_map,
1035             BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
1036         nvme_qpair_submit_tracker(tr->qpair, tr);
1037 }
1038
1039 static void
1040 _nvme_qpair_submit_request(struct nvme_qpair *qpair, struct nvme_request *req)
1041 {
1042         struct nvme_tracker     *tr;
1043         int                     err = 0;
1044
1045         mtx_assert(&qpair->lock, MA_OWNED);
1046
1047         tr = TAILQ_FIRST(&qpair->free_tr);
1048         req->qpair = qpair;
1049
1050         if (tr == NULL || !qpair->is_enabled) {
1051                 /*
1052                  * No tracker is available, or the qpair is disabled due to
1053                  *  an in-progress controller-level reset or controller
1054                  *  failure.
1055                  */
1056
1057                 if (qpair->ctrlr->is_failed) {
1058                         /*
1059                          * The controller has failed.  Post the request to a
1060                          *  task where it will be aborted, so that we do not
1061                          *  invoke the request's callback in the context
1062                          *  of the submission.
1063                          */
1064                         nvme_ctrlr_post_failed_request(qpair->ctrlr, req);
1065                 } else {
1066                         /*
1067                          * Put the request on the qpair's request queue to be
1068                          *  processed when a tracker frees up via a command
1069                          *  completion or when the controller reset is
1070                          *  completed.
1071                          */
1072                         STAILQ_INSERT_TAIL(&qpair->queued_req, req, stailq);
1073                 }
1074                 return;
1075         }
1076
1077         TAILQ_REMOVE(&qpair->free_tr, tr, tailq);
1078         TAILQ_INSERT_TAIL(&qpair->outstanding_tr, tr, tailq);
1079         tr->req = req;
1080
1081         switch (req->type) {
1082         case NVME_REQUEST_VADDR:
1083                 KASSERT(req->payload_size <= qpair->ctrlr->max_xfer_size,
1084                     ("payload_size (%d) exceeds max_xfer_size (%d)\n",
1085                     req->payload_size, qpair->ctrlr->max_xfer_size));
1086                 err = bus_dmamap_load(tr->qpair->dma_tag_payload,
1087                     tr->payload_dma_map, req->u.payload, req->payload_size,
1088                     nvme_payload_map, tr, 0);
1089                 if (err != 0)
1090                         nvme_printf(qpair->ctrlr,
1091                             "bus_dmamap_load returned 0x%x!\n", err);
1092                 break;
1093         case NVME_REQUEST_NULL:
1094                 nvme_qpair_submit_tracker(tr->qpair, tr);
1095                 break;
1096         case NVME_REQUEST_BIO:
1097                 KASSERT(req->u.bio->bio_bcount <= qpair->ctrlr->max_xfer_size,
1098                     ("bio->bio_bcount (%jd) exceeds max_xfer_size (%d)\n",
1099                     (intmax_t)req->u.bio->bio_bcount,
1100                     qpair->ctrlr->max_xfer_size));
1101                 err = bus_dmamap_load_bio(tr->qpair->dma_tag_payload,
1102                     tr->payload_dma_map, req->u.bio, nvme_payload_map, tr, 0);
1103                 if (err != 0)
1104                         nvme_printf(qpair->ctrlr,
1105                             "bus_dmamap_load_bio returned 0x%x!\n", err);
1106                 break;
1107         case NVME_REQUEST_CCB:
1108                 err = bus_dmamap_load_ccb(tr->qpair->dma_tag_payload,
1109                     tr->payload_dma_map, req->u.payload,
1110                     nvme_payload_map, tr, 0);
1111                 if (err != 0)
1112                         nvme_printf(qpair->ctrlr,
1113                             "bus_dmamap_load_ccb returned 0x%x!\n", err);
1114                 break;
1115         default:
1116                 panic("unknown nvme request type 0x%x\n", req->type);
1117                 break;
1118         }
1119
1120         if (err != 0) {
1121                 /*
1122                  * The dmamap operation failed, so we manually fail the
1123                  *  tracker here with DATA_TRANSFER_ERROR status.
1124                  *
1125                  * nvme_qpair_manual_complete_tracker must not be called
1126                  *  with the qpair lock held.
1127                  */
1128                 mtx_unlock(&qpair->lock);
1129                 nvme_qpair_manual_complete_tracker(tr, NVME_SCT_GENERIC,
1130                     NVME_SC_DATA_TRANSFER_ERROR, DO_NOT_RETRY, ERROR_PRINT_ALL);
1131                 mtx_lock(&qpair->lock);
1132         }
1133 }
1134
1135 void
1136 nvme_qpair_submit_request(struct nvme_qpair *qpair, struct nvme_request *req)
1137 {
1138
1139         mtx_lock(&qpair->lock);
1140         _nvme_qpair_submit_request(qpair, req);
1141         mtx_unlock(&qpair->lock);
1142 }
1143
1144 static void
1145 nvme_qpair_enable(struct nvme_qpair *qpair)
1146 {
1147
1148         qpair->is_enabled = true;
1149 }
1150
1151 void
1152 nvme_qpair_reset(struct nvme_qpair *qpair)
1153 {
1154
1155         qpair->sq_head = qpair->sq_tail = qpair->cq_head = 0;
1156
1157         /*
1158          * First time through the completion queue, HW will set phase
1159          *  bit on completions to 1.  So set this to 1 here, indicating
1160          *  we're looking for a 1 to know which entries have completed.
1161          *  we'll toggle the bit each time when the completion queue
1162          *  rolls over.
1163          */
1164         qpair->phase = 1;
1165
1166         memset(qpair->cmd, 0,
1167             qpair->num_entries * sizeof(struct nvme_command));
1168         memset(qpair->cpl, 0,
1169             qpair->num_entries * sizeof(struct nvme_completion));
1170 }
1171
1172 void
1173 nvme_admin_qpair_enable(struct nvme_qpair *qpair)
1174 {
1175         struct nvme_tracker             *tr;
1176         struct nvme_tracker             *tr_temp;
1177
1178         /*
1179          * Manually abort each outstanding admin command.  Do not retry
1180          *  admin commands found here, since they will be left over from
1181          *  a controller reset and its likely the context in which the
1182          *  command was issued no longer applies.
1183          */
1184         TAILQ_FOREACH_SAFE(tr, &qpair->outstanding_tr, tailq, tr_temp) {
1185                 nvme_printf(qpair->ctrlr,
1186                     "aborting outstanding admin command\n");
1187                 nvme_qpair_manual_complete_tracker(tr, NVME_SCT_GENERIC,
1188                     NVME_SC_ABORTED_BY_REQUEST, DO_NOT_RETRY, ERROR_PRINT_ALL);
1189         }
1190
1191         nvme_qpair_enable(qpair);
1192 }
1193
1194 void
1195 nvme_io_qpair_enable(struct nvme_qpair *qpair)
1196 {
1197         STAILQ_HEAD(, nvme_request)     temp;
1198         struct nvme_tracker             *tr;
1199         struct nvme_tracker             *tr_temp;
1200         struct nvme_request             *req;
1201
1202         /*
1203          * Manually abort each outstanding I/O.  This normally results in a
1204          *  retry, unless the retry count on the associated request has
1205          *  reached its limit.
1206          */
1207         TAILQ_FOREACH_SAFE(tr, &qpair->outstanding_tr, tailq, tr_temp) {
1208                 nvme_printf(qpair->ctrlr, "aborting outstanding i/o\n");
1209                 nvme_qpair_manual_complete_tracker(tr, NVME_SCT_GENERIC,
1210                     NVME_SC_ABORTED_BY_REQUEST, 0, ERROR_PRINT_NO_RETRY);
1211         }
1212
1213         mtx_lock(&qpair->lock);
1214
1215         nvme_qpair_enable(qpair);
1216
1217         STAILQ_INIT(&temp);
1218         STAILQ_SWAP(&qpair->queued_req, &temp, nvme_request);
1219
1220         while (!STAILQ_EMPTY(&temp)) {
1221                 req = STAILQ_FIRST(&temp);
1222                 STAILQ_REMOVE_HEAD(&temp, stailq);
1223                 nvme_printf(qpair->ctrlr, "resubmitting queued i/o\n");
1224                 nvme_qpair_print_command(qpair, &req->cmd);
1225                 _nvme_qpair_submit_request(qpair, req);
1226         }
1227
1228         mtx_unlock(&qpair->lock);
1229 }
1230
1231 static void
1232 nvme_qpair_disable(struct nvme_qpair *qpair)
1233 {
1234         struct nvme_tracker *tr;
1235
1236         qpair->is_enabled = false;
1237         mtx_lock(&qpair->lock);
1238         TAILQ_FOREACH(tr, &qpair->outstanding_tr, tailq)
1239                 callout_stop(&tr->timer);
1240         mtx_unlock(&qpair->lock);
1241 }
1242
1243 void
1244 nvme_admin_qpair_disable(struct nvme_qpair *qpair)
1245 {
1246
1247         nvme_qpair_disable(qpair);
1248         nvme_admin_qpair_abort_aers(qpair);
1249 }
1250
1251 void
1252 nvme_io_qpair_disable(struct nvme_qpair *qpair)
1253 {
1254
1255         nvme_qpair_disable(qpair);
1256 }
1257
1258 void
1259 nvme_qpair_fail(struct nvme_qpair *qpair)
1260 {
1261         struct nvme_tracker             *tr;
1262         struct nvme_request             *req;
1263
1264         if (!mtx_initialized(&qpair->lock))
1265                 return;
1266
1267         mtx_lock(&qpair->lock);
1268
1269         while (!STAILQ_EMPTY(&qpair->queued_req)) {
1270                 req = STAILQ_FIRST(&qpair->queued_req);
1271                 STAILQ_REMOVE_HEAD(&qpair->queued_req, stailq);
1272                 nvme_printf(qpair->ctrlr, "failing queued i/o\n");
1273                 mtx_unlock(&qpair->lock);
1274                 nvme_qpair_manual_complete_request(qpair, req, NVME_SCT_GENERIC,
1275                     NVME_SC_ABORTED_BY_REQUEST);
1276                 mtx_lock(&qpair->lock);
1277         }
1278
1279         /* Manually abort each outstanding I/O. */
1280         while (!TAILQ_EMPTY(&qpair->outstanding_tr)) {
1281                 tr = TAILQ_FIRST(&qpair->outstanding_tr);
1282                 /*
1283                  * Do not remove the tracker.  The abort_tracker path will
1284                  *  do that for us.
1285                  */
1286                 nvme_printf(qpair->ctrlr, "failing outstanding i/o\n");
1287                 mtx_unlock(&qpair->lock);
1288                 nvme_qpair_manual_complete_tracker(tr, NVME_SCT_GENERIC,
1289                     NVME_SC_ABORTED_BY_REQUEST, DO_NOT_RETRY, ERROR_PRINT_ALL);
1290                 mtx_lock(&qpair->lock);
1291         }
1292
1293         mtx_unlock(&qpair->lock);
1294 }