drivers/scsi/qla2xxx/qla_iocb.c

   1 /*
   2  * QLogic Fibre Channel HBA Driver
   3  * Copyright (c)  2003-2008 QLogic Corporation
   4  *
   5  * See LICENSE.qla2xxx for copyright and licensing details.
   6  */
   7 #include "qla_def.h"
   8
   9 #include <linux/blkdev.h>
  10 #include <linux/delay.h>
  11
  12 #include <scsi/scsi_tcq.h>
  13
  14 static request_t *qla2x00_req_pkt(scsi_qla_host_t *ha);
  15 static void qla2x00_isp_cmd(scsi_qla_host_t *ha);
  16
  17 /**
  18  * qla2x00_get_cmd_direction() - Determine control_flag data direction.
  19  * @cmd: SCSI command
  20  *
  21  * Returns the proper CF_* direction based on CDB.
  22  */
  23 static inline uint16_t
  24 qla2x00_get_cmd_direction(struct scsi_cmnd *cmd)
  25 {
  26         uint16_t cflags;
  27
  28         cflags = 0;
  29
  30         /* Set transfer direction */
  31         if (cmd->sc_data_direction == DMA_TO_DEVICE)
  32                 cflags = CF_WRITE;
  33         else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
  34                 cflags = CF_READ;
  35         return (cflags);
  36 }
  37
  38 /**
  39  * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
  40  * Continuation Type 0 IOCBs to allocate.
  41  *
  42  * @dsds: number of data segment decriptors needed
  43  *
  44  * Returns the number of IOCB entries needed to store @dsds.
  45  */
  46 uint16_t
  47 qla2x00_calc_iocbs_32(uint16_t dsds)
  48 {
  49         uint16_t iocbs;
  50
  51         iocbs = 1;
  52         if (dsds > 3) {
  53                 iocbs += (dsds - 3) / 7;
  54                 if ((dsds - 3) % 7)
  55                         iocbs++;
  56         }
  57         return (iocbs);
  58 }
  59
  60 /**
  61  * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
  62  * Continuation Type 1 IOCBs to allocate.
  63  *
  64  * @dsds: number of data segment decriptors needed
  65  *
  66  * Returns the number of IOCB entries needed to store @dsds.
  67  */
  68 uint16_t
  69 qla2x00_calc_iocbs_64(uint16_t dsds)
  70 {
  71         uint16_t iocbs;
  72
  73         iocbs = 1;
  74         if (dsds > 2) {
  75                 iocbs += (dsds - 2) / 5;
  76                 if ((dsds - 2) % 5)
  77                         iocbs++;
  78         }
  79         return (iocbs);
  80 }
  81
  82 /**
  83  * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
  84  * @ha: HA context
  85  *
  86  * Returns a pointer to the Continuation Type 0 IOCB packet.
  87  */
  88 static inline cont_entry_t *
  89 qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *ha)
  90 {
  91         cont_entry_t *cont_pkt;
  92
  93         /* Adjust ring index. */
  94         ha->req_ring_index++;
  95         if (ha->req_ring_index == ha->request_q_length) {
  96                 ha->req_ring_index = 0;
  97                 ha->request_ring_ptr = ha->request_ring;
  98         } else {
  99                 ha->request_ring_ptr++;
 100         }
 101
 102         cont_pkt = (cont_entry_t *)ha->request_ring_ptr;
 103
 104         /* Load packet defaults. */
 105         *((uint32_t *)(&cont_pkt->entry_type)) =
 106             __constant_cpu_to_le32(CONTINUE_TYPE);
 107
 108         return (cont_pkt);
 109 }
 110
 111 /**
 112  * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
 113  * @ha: HA context
 114  *
 115  * Returns a pointer to the continuation type 1 IOCB packet.
 116  */
 117 static inline cont_a64_entry_t *
 118 qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *ha)
 119 {
 120         cont_a64_entry_t *cont_pkt;
 121
 122         /* Adjust ring index. */
 123         ha->req_ring_index++;
 124         if (ha->req_ring_index == ha->request_q_length) {
 125                 ha->req_ring_index = 0;
 126                 ha->request_ring_ptr = ha->request_ring;
 127         } else {
 128                 ha->request_ring_ptr++;
 129         }
 130
 131         cont_pkt = (cont_a64_entry_t *)ha->request_ring_ptr;
 132
 133         /* Load packet defaults. */
 134         *((uint32_t *)(&cont_pkt->entry_type)) =
 135             __constant_cpu_to_le32(CONTINUE_A64_TYPE);
 136
 137         return (cont_pkt);
 138 }
 139
 140 /**
 141  * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
 142  * capable IOCB types.
 143  *
 144  * @sp: SRB command to process
 145  * @cmd_pkt: Command type 2 IOCB
 146  * @tot_dsds: Total number of segments to transfer
 147  */
 148 void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
 149     uint16_t tot_dsds)
 150 {
 151         uint16_t        avail_dsds;
 152         uint32_t        *cur_dsd;
 153         scsi_qla_host_t *ha;
 154         struct scsi_cmnd *cmd;
 155         struct scatterlist *sg;
 156         int i;
 157
 158         cmd = sp->cmd;
 159
 160         /* Update entry type to indicate Command Type 2 IOCB */
 161         *((uint32_t *)(&cmd_pkt->entry_type)) =
 162             __constant_cpu_to_le32(COMMAND_TYPE);
 163
 164         /* No data transfer */
 165         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 166                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 167                 return;
 168         }
 169
 170         ha = sp->ha;
 171
 172         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
 173
 174         /* Three DSDs are available in the Command Type 2 IOCB */
 175         avail_dsds = 3;
 176         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 177
 178         /* Load data segments */
 179         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 180                 cont_entry_t *cont_pkt;
 181
 182                 /* Allocate additional continuation packets? */
 183                 if (avail_dsds == 0) {
 184                         /*
 185                          * Seven DSDs are available in the Continuation
 186                          * Type 0 IOCB.
 187                          */
 188                         cont_pkt = qla2x00_prep_cont_type0_iocb(ha);
 189                         cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
 190                         avail_dsds = 7;
 191                 }
 192
 193                 *cur_dsd++ = cpu_to_le32(sg_dma_address(sg));
 194                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 195                 avail_dsds--;
 196         }
 197 }
 198
 199 /**
 200  * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
 201  * capable IOCB types.
 202  *
 203  * @sp: SRB command to process
 204  * @cmd_pkt: Command type 3 IOCB
 205  * @tot_dsds: Total number of segments to transfer
 206  */
 207 void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
 208     uint16_t tot_dsds)
 209 {
 210         uint16_t        avail_dsds;
 211         uint32_t        *cur_dsd;
 212         scsi_qla_host_t *ha;
 213         struct scsi_cmnd *cmd;
 214         struct scatterlist *sg;
 215         int i;
 216
 217         cmd = sp->cmd;
 218
 219         /* Update entry type to indicate Command Type 3 IOCB */
 220         *((uint32_t *)(&cmd_pkt->entry_type)) =
 221             __constant_cpu_to_le32(COMMAND_A64_TYPE);
 222
 223         /* No data transfer */
 224         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 225                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 226                 return;
 227         }
 228
 229         ha = sp->ha;
 230
 231         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
 232
 233         /* Two DSDs are available in the Command Type 3 IOCB */
 234         avail_dsds = 2;
 235         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 236
 237         /* Load data segments */
 238         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 239                 dma_addr_t      sle_dma;
 240                 cont_a64_entry_t *cont_pkt;
 241
 242                 /* Allocate additional continuation packets? */
 243                 if (avail_dsds == 0) {
 244                         /*
 245                          * Five DSDs are available in the Continuation
 246                          * Type 1 IOCB.
 247                          */
 248                         cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
 249                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 250                         avail_dsds = 5;
 251                 }
 252
 253                 sle_dma = sg_dma_address(sg);
 254                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 255                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 256                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 257                 avail_dsds--;
 258         }
 259 }
 260
 261 /**
 262  * qla2x00_start_scsi() - Send a SCSI command to the ISP
 263  * @sp: command to send to the ISP
 264  *
 265  * Returns non-zero if a failure occured, else zero.
 266  */
 267 int
 268 qla2x00_start_scsi(srb_t *sp)
 269 {
 270         int             ret, nseg;
 271         unsigned long   flags;
 272         scsi_qla_host_t *ha;
 273         struct scsi_cmnd *cmd;
 274         uint32_t        *clr_ptr;
 275         uint32_t        index;
 276         uint32_t        handle;
 277         cmd_entry_t     *cmd_pkt;
 278         uint16_t        cnt;
 279         uint16_t        req_cnt;
 280         uint16_t        tot_dsds;
 281         struct device_reg_2xxx __iomem *reg;
 282
 283         /* Setup device pointers. */
 284         ret = 0;
 285         ha = sp->ha;
 286         reg = &ha->iobase->isp;
 287         cmd = sp->cmd;
 288         /* So we know we haven't pci_map'ed anything yet */
 289         tot_dsds = 0;
 290
 291         /* Send marker if required */
 292         if (ha->marker_needed != 0) {
 293                 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
 294                         return (QLA_FUNCTION_FAILED);
 295                 }
 296                 ha->marker_needed = 0;
 297         }
 298
 299         /* Acquire ring specific lock */
 300         spin_lock_irqsave(&ha->hardware_lock, flags);
 301
 302         /* Check for room in outstanding command list. */
 303         handle = ha->current_outstanding_cmd;
 304         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 305                 handle++;
 306                 if (handle == MAX_OUTSTANDING_COMMANDS)
 307                         handle = 1;
 308                 if (!ha->outstanding_cmds[handle])
 309                         break;
 310         }
 311         if (index == MAX_OUTSTANDING_COMMANDS)
 312                 goto queuing_error;
 313
 314         /* Map the sg table so we have an accurate count of sg entries needed */
 315         if (scsi_sg_count(cmd)) {
 316                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
 317                     scsi_sg_count(cmd), cmd->sc_data_direction);
 318                 if (unlikely(!nseg))
 319                         goto queuing_error;
 320         } else
 321                 nseg = 0;
 322
 323         tot_dsds = nseg;
 324
 325         /* Calculate the number of request entries needed. */
 326         req_cnt = ha->isp_ops->calc_req_entries(tot_dsds);
 327         if (ha->req_q_cnt < (req_cnt + 2)) {
 328                 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
 329                 if (ha->req_ring_index < cnt)
 330                         ha->req_q_cnt = cnt - ha->req_ring_index;
 331                 else
 332                         ha->req_q_cnt = ha->request_q_length -
 333                             (ha->req_ring_index - cnt);
 334         }
 335         if (ha->req_q_cnt < (req_cnt + 2))
 336                 goto queuing_error;
 337
 338         /* Build command packet */
 339         ha->current_outstanding_cmd = handle;
 340         ha->outstanding_cmds[handle] = sp;
 341         sp->ha = ha;
 342         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 343         ha->req_q_cnt -= req_cnt;
 344
 345         cmd_pkt = (cmd_entry_t *)ha->request_ring_ptr;
 346         cmd_pkt->handle = handle;
 347         /* Zero out remaining portion of packet. */
 348         clr_ptr = (uint32_t *)cmd_pkt + 2;
 349         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 350         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 351
 352         /* Set target ID and LUN number*/
 353         SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
 354         cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
 355
 356         /* Update tagged queuing modifier */
 357         cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
 358
 359         /* Load SCSI command packet. */
 360         memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
 361         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 362
 363         /* Build IOCB segments */
 364         ha->isp_ops->build_iocbs(sp, cmd_pkt, tot_dsds);
 365
 366         /* Set total data segment count. */
 367         cmd_pkt->entry_count = (uint8_t)req_cnt;
 368         wmb();
 369
 370         /* Adjust ring index. */
 371         ha->req_ring_index++;
 372         if (ha->req_ring_index == ha->request_q_length) {
 373                 ha->req_ring_index = 0;
 374                 ha->request_ring_ptr = ha->request_ring;
 375         } else
 376                 ha->request_ring_ptr++;
 377
 378         sp->flags |= SRB_DMA_VALID;
 379
 380         /* Set chip new ring index. */
 381         WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
 382         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));     /* PCI Posting. */
 383
 384         /* Manage unprocessed RIO/ZIO commands in response queue. */
 385         if (ha->flags.process_response_queue &&
 386             ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
 387                 qla2x00_process_response_queue(ha);
 388
 389         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 390         return (QLA_SUCCESS);
 391
 392 queuing_error:
 393         if (tot_dsds)
 394                 scsi_dma_unmap(cmd);
 395
 396         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 397
 398         return (QLA_FUNCTION_FAILED);
 399 }
 400
 401 /**
 402  * qla2x00_marker() - Send a marker IOCB to the firmware.
 403  * @ha: HA context
 404  * @loop_id: loop ID
 405  * @lun: LUN
 406  * @type: marker modifier
 407  *
 408  * Can be called from both normal and interrupt context.
 409  *
 410  * Returns non-zero if a failure occured, else zero.
 411  */
 412 int
 413 __qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
 414     uint8_t type)
 415 {
 416         mrk_entry_t *mrk;
 417         struct mrk_entry_24xx *mrk24;
 418         scsi_qla_host_t *pha = to_qla_parent(ha);
 419
 420         mrk24 = NULL;
 421         mrk = (mrk_entry_t *)qla2x00_req_pkt(pha);
 422         if (mrk == NULL) {
 423                 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
 424                     __func__, ha->host_no));
 425
 426                 return (QLA_FUNCTION_FAILED);
 427         }
 428
 429         mrk->entry_type = MARKER_TYPE;
 430         mrk->modifier = type;
 431         if (type != MK_SYNC_ALL) {
 432                 if (IS_FWI2_CAPABLE(ha)) {
 433                         mrk24 = (struct mrk_entry_24xx *) mrk;
 434                         mrk24->nport_handle = cpu_to_le16(loop_id);
 435                         mrk24->lun[1] = LSB(lun);
 436                         mrk24->lun[2] = MSB(lun);
 437                         host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun));
 438                         mrk24->vp_index = ha->vp_idx;
 439                 } else {
 440                         SET_TARGET_ID(ha, mrk->target, loop_id);
 441                         mrk->lun = cpu_to_le16(lun);
 442                 }
 443         }
 444         wmb();
 445
 446         qla2x00_isp_cmd(pha);
 447
 448         return (QLA_SUCCESS);
 449 }
 450
 451 int
 452 qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
 453     uint8_t type)
 454 {
 455         int ret;
 456         unsigned long flags = 0;
 457
 458         spin_lock_irqsave(&ha->hardware_lock, flags);
 459         ret = __qla2x00_marker(ha, loop_id, lun, type);
 460         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 461
 462         return (ret);
 463 }
 464
 465 /**
 466  * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
 467  * @ha: HA context
 468  *
 469  * Note: The caller must hold the hardware lock before calling this routine.
 470  *
 471  * Returns NULL if function failed, else, a pointer to the request packet.
 472  */
 473 static request_t *
 474 qla2x00_req_pkt(scsi_qla_host_t *ha)
 475 {
 476         device_reg_t __iomem *reg = ha->iobase;
 477         request_t       *pkt = NULL;
 478         uint16_t        cnt;
 479         uint32_t        *dword_ptr;
 480         uint32_t        timer;
 481         uint16_t        req_cnt = 1;
 482
 483         /* Wait 1 second for slot. */
 484         for (timer = HZ; timer; timer--) {
 485                 if ((req_cnt + 2) >= ha->req_q_cnt) {
 486                         /* Calculate number of free request entries. */
 487                         if (IS_FWI2_CAPABLE(ha))
 488                                 cnt = (uint16_t)RD_REG_DWORD(
 489                                     &reg->isp24.req_q_out);
 490                         else
 491                                 cnt = qla2x00_debounce_register(
 492                                     ISP_REQ_Q_OUT(ha, &reg->isp));
 493                         if  (ha->req_ring_index < cnt)
 494                                 ha->req_q_cnt = cnt - ha->req_ring_index;
 495                         else
 496                                 ha->req_q_cnt = ha->request_q_length -
 497                                     (ha->req_ring_index - cnt);
 498                 }
 499                 /* If room for request in request ring. */
 500                 if ((req_cnt + 2) < ha->req_q_cnt) {
 501                         ha->req_q_cnt--;
 502                         pkt = ha->request_ring_ptr;
 503
 504                         /* Zero out packet. */
 505                         dword_ptr = (uint32_t *)pkt;
 506                         for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
 507                                 *dword_ptr++ = 0;
 508
 509                         /* Set system defined field. */
 510                         pkt->sys_define = (uint8_t)ha->req_ring_index;
 511
 512                         /* Set entry count. */
 513                         pkt->entry_count = 1;
 514
 515                         break;
 516                 }
 517
 518                 /* Release ring specific lock */
 519                 spin_unlock(&ha->hardware_lock);
 520
 521                 udelay(2);   /* 2 us */
 522
 523                 /* Check for pending interrupts. */
 524                 /* During init we issue marker directly */
 525                 if (!ha->marker_needed && !ha->flags.init_done)
 526                         qla2x00_poll(ha);
 527
 528                 spin_lock_irq(&ha->hardware_lock);
 529         }
 530         if (!pkt) {
 531                 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
 532         }
 533
 534         return (pkt);
 535 }
 536
 537 /**
 538  * qla2x00_isp_cmd() - Modify the request ring pointer.
 539  * @ha: HA context
 540  *
 541  * Note: The caller must hold the hardware lock before calling this routine.
 542  */
 543 static void
 544 qla2x00_isp_cmd(scsi_qla_host_t *ha)
 545 {
 546         device_reg_t __iomem *reg = ha->iobase;
 547
 548         DEBUG5(printk("%s(): IOCB data:\n", __func__));
 549         DEBUG5(qla2x00_dump_buffer(
 550             (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE));
 551
 552         /* Adjust ring index. */
 553         ha->req_ring_index++;
 554         if (ha->req_ring_index == ha->request_q_length) {
 555                 ha->req_ring_index = 0;
 556                 ha->request_ring_ptr = ha->request_ring;
 557         } else
 558                 ha->request_ring_ptr++;
 559
 560         /* Set chip new ring index. */
 561         if (IS_FWI2_CAPABLE(ha)) {
 562                 WRT_REG_DWORD(&reg->isp24.req_q_in, ha->req_ring_index);
 563                 RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
 564         } else {
 565                 WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp), ha->req_ring_index);
 566                 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
 567         }
 568
 569 }
 570
 571 /**
 572  * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
 573  * Continuation Type 1 IOCBs to allocate.
 574  *
 575  * @dsds: number of data segment decriptors needed
 576  *
 577  * Returns the number of IOCB entries needed to store @dsds.
 578  */
 579 static inline uint16_t
 580 qla24xx_calc_iocbs(uint16_t dsds)
 581 {
 582         uint16_t iocbs;
 583
 584         iocbs = 1;
 585         if (dsds > 1) {
 586                 iocbs += (dsds - 1) / 5;
 587                 if ((dsds - 1) % 5)
 588                         iocbs++;
 589         }
 590         return iocbs;
 591 }
 592
 593 /**
 594  * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
 595  * IOCB types.
 596  *
 597  * @sp: SRB command to process
 598  * @cmd_pkt: Command type 3 IOCB
 599  * @tot_dsds: Total number of segments to transfer
 600  */
 601 static inline void
 602 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 603     uint16_t tot_dsds)
 604 {
 605         uint16_t        avail_dsds;
 606         uint32_t        *cur_dsd;
 607         scsi_qla_host_t *ha;
 608         struct scsi_cmnd *cmd;
 609         struct scatterlist *sg;
 610         int i;
 611
 612         cmd = sp->cmd;
 613
 614         /* Update entry type to indicate Command Type 3 IOCB */
 615         *((uint32_t *)(&cmd_pkt->entry_type)) =
 616             __constant_cpu_to_le32(COMMAND_TYPE_7);
 617
 618         /* No data transfer */
 619         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 620                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 621                 return;
 622         }
 623
 624         ha = sp->ha;
 625
 626         /* Set transfer direction */
 627         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 628                 cmd_pkt->task_mgmt_flags =
 629                     __constant_cpu_to_le16(TMF_WRITE_DATA);
 630         else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 631                 cmd_pkt->task_mgmt_flags =
 632                     __constant_cpu_to_le16(TMF_READ_DATA);
 633
 634         /* One DSD is available in the Command Type 3 IOCB */
 635         avail_dsds = 1;
 636         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 637
 638         /* Load data segments */
 639
 640         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 641                 dma_addr_t      sle_dma;
 642                 cont_a64_entry_t *cont_pkt;
 643
 644                 /* Allocate additional continuation packets? */
 645                 if (avail_dsds == 0) {
 646                         /*
 647                          * Five DSDs are available in the Continuation
 648                          * Type 1 IOCB.
 649                          */
 650                         cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
 651                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 652                         avail_dsds = 5;
 653                 }
 654
 655                 sle_dma = sg_dma_address(sg);
 656                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 657                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 658                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 659                 avail_dsds--;
 660         }
 661 }
 662
 663
 664 /**
 665  * qla24xx_start_scsi() - Send a SCSI command to the ISP
 666  * @sp: command to send to the ISP
 667  *
 668  * Returns non-zero if a failure occured, else zero.
 669  */
 670 int
 671 qla24xx_start_scsi(srb_t *sp)
 672 {
 673         int             ret, nseg;
 674         unsigned long   flags;
 675         scsi_qla_host_t *ha;
 676         struct scsi_cmnd *cmd;
 677         uint32_t        *clr_ptr;
 678         uint32_t        index;
 679         uint32_t        handle;
 680         struct cmd_type_7 *cmd_pkt;
 681         uint16_t        cnt;
 682         uint16_t        req_cnt;
 683         uint16_t        tot_dsds;
 684         struct device_reg_24xx __iomem *reg;
 685
 686         /* Setup device pointers. */
 687         ret = 0;
 688         ha = sp->ha;
 689         reg = &ha->iobase->isp24;
 690         cmd = sp->cmd;
 691         /* So we know we haven't pci_map'ed anything yet */
 692         tot_dsds = 0;
 693
 694         /* Send marker if required */
 695         if (ha->marker_needed != 0) {
 696                 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
 697                         return QLA_FUNCTION_FAILED;
 698                 }
 699                 ha->marker_needed = 0;
 700         }
 701
 702         /* Acquire ring specific lock */
 703         spin_lock_irqsave(&ha->hardware_lock, flags);
 704
 705         /* Check for room in outstanding command list. */
 706         handle = ha->current_outstanding_cmd;
 707         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 708                 handle++;
 709                 if (handle == MAX_OUTSTANDING_COMMANDS)
 710                         handle = 1;
 711                 if (!ha->outstanding_cmds[handle])
 712                         break;
 713         }
 714         if (index == MAX_OUTSTANDING_COMMANDS)
 715                 goto queuing_error;
 716
 717         /* Map the sg table so we have an accurate count of sg entries needed */
 718         if (scsi_sg_count(cmd)) {
 719                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
 720                     scsi_sg_count(cmd), cmd->sc_data_direction);
 721                 if (unlikely(!nseg))
 722                         goto queuing_error;
 723         } else
 724                 nseg = 0;
 725
 726         tot_dsds = nseg;
 727
 728         req_cnt = qla24xx_calc_iocbs(tot_dsds);
 729         if (ha->req_q_cnt < (req_cnt + 2)) {
 730                 cnt = (uint16_t)RD_REG_DWORD_RELAXED(&reg->req_q_out);
 731                 if (ha->req_ring_index < cnt)
 732                         ha->req_q_cnt = cnt - ha->req_ring_index;
 733                 else
 734                         ha->req_q_cnt = ha->request_q_length -
 735                                 (ha->req_ring_index - cnt);
 736         }
 737         if (ha->req_q_cnt < (req_cnt + 2))
 738                 goto queuing_error;
 739
 740         /* Build command packet. */
 741         ha->current_outstanding_cmd = handle;
 742         ha->outstanding_cmds[handle] = sp;
 743         sp->ha = ha;
 744         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 745         ha->req_q_cnt -= req_cnt;
 746
 747         cmd_pkt = (struct cmd_type_7 *)ha->request_ring_ptr;
 748         cmd_pkt->handle = handle;
 749
 750         /* Zero out remaining portion of packet. */
 751         /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
 752         clr_ptr = (uint32_t *)cmd_pkt + 2;
 753         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 754         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 755
 756         /* Set NPORT-ID and LUN number*/
 757         cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
 758         cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
 759         cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
 760         cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
 761         cmd_pkt->vp_index = sp->fcport->vp_idx;
 762
 763         int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
 764         host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
 765
 766         /* Load SCSI command packet. */
 767         memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
 768         host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
 769
 770         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 771
 772         /* Build IOCB segments */
 773         qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
 774
 775         /* Set total data segment count. */
 776         cmd_pkt->entry_count = (uint8_t)req_cnt;
 777         wmb();
 778
 779         /* Adjust ring index. */
 780         ha->req_ring_index++;
 781         if (ha->req_ring_index == ha->request_q_length) {
 782                 ha->req_ring_index = 0;
 783                 ha->request_ring_ptr = ha->request_ring;
 784         } else
 785                 ha->request_ring_ptr++;
 786
 787         sp->flags |= SRB_DMA_VALID;
 788
 789         /* Set chip new ring index. */
 790         WRT_REG_DWORD(&reg->req_q_in, ha->req_ring_index);
 791         RD_REG_DWORD_RELAXED(&reg->req_q_in);           /* PCI Posting. */
 792
 793         /* Manage unprocessed RIO/ZIO commands in response queue. */
 794         if (ha->flags.process_response_queue &&
 795             ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
 796                 qla24xx_process_response_queue(ha);
 797
 798         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 799         return QLA_SUCCESS;
 800
 801 queuing_error:
 802         if (tot_dsds)
 803                 scsi_dma_unmap(cmd);
 804
 805         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 806
 807         return QLA_FUNCTION_FAILED;
 808 }