git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/qla2xxx/qla_iocb.c

   1 /*
   2  * QLogic Fibre Channel HBA Driver
   3  * Copyright (c)  2003-2005 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 inline uint16_t qla2x00_get_cmd_direction(struct scsi_cmnd *cmd);
  15 static inline cont_entry_t *qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *);
  16 static inline cont_a64_entry_t *qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *);
  17 static request_t *qla2x00_req_pkt(scsi_qla_host_t *ha);
  18 static void qla2x00_isp_cmd(scsi_qla_host_t *ha);
  19
  20 /**
  21  * qla2x00_get_cmd_direction() - Determine control_flag data direction.
  22  * @cmd: SCSI command
  23  *
  24  * Returns the proper CF_* direction based on CDB.
  25  */
  26 static inline uint16_t
  27 qla2x00_get_cmd_direction(struct scsi_cmnd *cmd)
  28 {
  29         uint16_t cflags;
  30
  31         cflags = 0;
  32
  33         /* Set transfer direction */
  34         if (cmd->sc_data_direction == DMA_TO_DEVICE)
  35                 cflags = CF_WRITE;
  36         else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
  37                 cflags = CF_READ;
  38         return (cflags);
  39 }
  40
  41 /**
  42  * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
  43  * Continuation Type 0 IOCBs to allocate.
  44  *
  45  * @dsds: number of data segment decriptors needed
  46  *
  47  * Returns the number of IOCB entries needed to store @dsds.
  48  */
  49 uint16_t
  50 qla2x00_calc_iocbs_32(uint16_t dsds)
  51 {
  52         uint16_t iocbs;
  53
  54         iocbs = 1;
  55         if (dsds > 3) {
  56                 iocbs += (dsds - 3) / 7;
  57                 if ((dsds - 3) % 7)
  58                         iocbs++;
  59         }
  60         return (iocbs);
  61 }
  62
  63 /**
  64  * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
  65  * Continuation Type 1 IOCBs to allocate.
  66  *
  67  * @dsds: number of data segment decriptors needed
  68  *
  69  * Returns the number of IOCB entries needed to store @dsds.
  70  */
  71 uint16_t
  72 qla2x00_calc_iocbs_64(uint16_t dsds)
  73 {
  74         uint16_t iocbs;
  75
  76         iocbs = 1;
  77         if (dsds > 2) {
  78                 iocbs += (dsds - 2) / 5;
  79                 if ((dsds - 2) % 5)
  80                         iocbs++;
  81         }
  82         return (iocbs);
  83 }
  84
  85 /**
  86  * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
  87  * @ha: HA context
  88  *
  89  * Returns a pointer to the Continuation Type 0 IOCB packet.
  90  */
  91 static inline cont_entry_t *
  92 qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *ha)
  93 {
  94         cont_entry_t *cont_pkt;
  95
  96         /* Adjust ring index. */
  97         ha->req_ring_index++;
  98         if (ha->req_ring_index == ha->request_q_length) {
  99                 ha->req_ring_index = 0;
 100                 ha->request_ring_ptr = ha->request_ring;
 101         } else {
 102                 ha->request_ring_ptr++;
 103         }
 104
 105         cont_pkt = (cont_entry_t *)ha->request_ring_ptr;
 106
 107         /* Load packet defaults. */
 108         *((uint32_t *)(&cont_pkt->entry_type)) =
 109             __constant_cpu_to_le32(CONTINUE_TYPE);
 110
 111         return (cont_pkt);
 112 }
 113
 114 /**
 115  * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
 116  * @ha: HA context
 117  *
 118  * Returns a pointer to the continuation type 1 IOCB packet.
 119  */
 120 static inline cont_a64_entry_t *
 121 qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *ha)
 122 {
 123         cont_a64_entry_t *cont_pkt;
 124
 125         /* Adjust ring index. */
 126         ha->req_ring_index++;
 127         if (ha->req_ring_index == ha->request_q_length) {
 128                 ha->req_ring_index = 0;
 129                 ha->request_ring_ptr = ha->request_ring;
 130         } else {
 131                 ha->request_ring_ptr++;
 132         }
 133
 134         cont_pkt = (cont_a64_entry_t *)ha->request_ring_ptr;
 135
 136         /* Load packet defaults. */
 137         *((uint32_t *)(&cont_pkt->entry_type)) =
 138             __constant_cpu_to_le32(CONTINUE_A64_TYPE);
 139
 140         return (cont_pkt);
 141 }
 142
 143 /**
 144  * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
 145  * capable IOCB types.
 146  *
 147  * @sp: SRB command to process
 148  * @cmd_pkt: Command type 2 IOCB
 149  * @tot_dsds: Total number of segments to transfer
 150  */
 151 void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
 152     uint16_t tot_dsds)
 153 {
 154         uint16_t        avail_dsds;
 155         uint32_t        *cur_dsd;
 156         scsi_qla_host_t *ha;
 157         struct scsi_cmnd *cmd;
 158         struct scatterlist *sg;
 159         int i;
 160
 161         cmd = sp->cmd;
 162
 163         /* Update entry type to indicate Command Type 2 IOCB */
 164         *((uint32_t *)(&cmd_pkt->entry_type)) =
 165             __constant_cpu_to_le32(COMMAND_TYPE);
 166
 167         /* No data transfer */
 168         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 169                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 170                 return;
 171         }
 172
 173         ha = sp->ha;
 174
 175         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
 176
 177         /* Three DSDs are available in the Command Type 2 IOCB */
 178         avail_dsds = 3;
 179         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 180
 181         /* Load data segments */
 182         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 183                 cont_entry_t *cont_pkt;
 184
 185                 /* Allocate additional continuation packets? */
 186                 if (avail_dsds == 0) {
 187                         /*
 188                          * Seven DSDs are available in the Continuation
 189                          * Type 0 IOCB.
 190                          */
 191                         cont_pkt = qla2x00_prep_cont_type0_iocb(ha);
 192                         cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
 193                         avail_dsds = 7;
 194                 }
 195
 196                 *cur_dsd++ = cpu_to_le32(sg_dma_address(sg));
 197                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 198                 avail_dsds--;
 199         }
 200 }
 201
 202 /**
 203  * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
 204  * capable IOCB types.
 205  *
 206  * @sp: SRB command to process
 207  * @cmd_pkt: Command type 3 IOCB
 208  * @tot_dsds: Total number of segments to transfer
 209  */
 210 void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
 211     uint16_t tot_dsds)
 212 {
 213         uint16_t        avail_dsds;
 214         uint32_t        *cur_dsd;
 215         scsi_qla_host_t *ha;
 216         struct scsi_cmnd *cmd;
 217         struct scatterlist *sg;
 218         int i;
 219
 220         cmd = sp->cmd;
 221
 222         /* Update entry type to indicate Command Type 3 IOCB */
 223         *((uint32_t *)(&cmd_pkt->entry_type)) =
 224             __constant_cpu_to_le32(COMMAND_A64_TYPE);
 225
 226         /* No data transfer */
 227         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 228                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 229                 return;
 230         }
 231
 232         ha = sp->ha;
 233
 234         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
 235
 236         /* Two DSDs are available in the Command Type 3 IOCB */
 237         avail_dsds = 2;
 238         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 239
 240         /* Load data segments */
 241         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 242                 dma_addr_t      sle_dma;
 243                 cont_a64_entry_t *cont_pkt;
 244
 245                 /* Allocate additional continuation packets? */
 246                 if (avail_dsds == 0) {
 247                         /*
 248                          * Five DSDs are available in the Continuation
 249                          * Type 1 IOCB.
 250                          */
 251                         cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
 252                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 253                         avail_dsds = 5;
 254                 }
 255
 256                 sle_dma = sg_dma_address(sg);
 257                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 258                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 259                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 260                 avail_dsds--;
 261         }
 262 }
 263
 264 /**
 265  * qla2x00_start_scsi() - Send a SCSI command to the ISP
 266  * @sp: command to send to the ISP
 267  *
 268  * Returns non-zero if a failure occured, else zero.
 269  */
 270 int
 271 qla2x00_start_scsi(srb_t *sp)
 272 {
 273         int             ret, nseg;
 274         unsigned long   flags;
 275         scsi_qla_host_t *ha;
 276         struct scsi_cmnd *cmd;
 277         uint32_t        *clr_ptr;
 278         uint32_t        index;
 279         uint32_t        handle;
 280         cmd_entry_t     *cmd_pkt;
 281         uint16_t        cnt;
 282         uint16_t        req_cnt;
 283         uint16_t        tot_dsds;
 284         struct device_reg_2xxx __iomem *reg;
 285
 286         /* Setup device pointers. */
 287         ret = 0;
 288         ha = sp->ha;
 289         reg = &ha->iobase->isp;
 290         cmd = sp->cmd;
 291         /* So we know we haven't pci_map'ed anything yet */
 292         tot_dsds = 0;
 293
 294         /* Send marker if required */
 295         if (ha->marker_needed != 0) {
 296                 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
 297                         return (QLA_FUNCTION_FAILED);
 298                 }
 299                 ha->marker_needed = 0;
 300         }
 301
 302         /* Acquire ring specific lock */
 303         spin_lock_irqsave(&ha->hardware_lock, flags);
 304
 305         /* Check for room in outstanding command list. */
 306         handle = ha->current_outstanding_cmd;
 307         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 308                 handle++;
 309                 if (handle == MAX_OUTSTANDING_COMMANDS)
 310                         handle = 1;
 311                 if (ha->outstanding_cmds[handle] == 0)
 312                         break;
 313         }
 314         if (index == MAX_OUTSTANDING_COMMANDS)
 315                 goto queuing_error;
 316
 317         /* Map the sg table so we have an accurate count of sg entries needed */
 318         if (scsi_sg_count(cmd)) {
 319                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
 320                     scsi_sg_count(cmd), cmd->sc_data_direction);
 321                 if (unlikely(!nseg))
 322                         goto queuing_error;
 323         } else
 324                 nseg = 0;
 325
 326         tot_dsds = nseg;
 327
 328         /* Calculate the number of request entries needed. */
 329         req_cnt = ha->isp_ops.calc_req_entries(tot_dsds);
 330         if (ha->req_q_cnt < (req_cnt + 2)) {
 331                 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
 332                 if (ha->req_ring_index < cnt)
 333                         ha->req_q_cnt = cnt - ha->req_ring_index;
 334                 else
 335                         ha->req_q_cnt = ha->request_q_length -
 336                             (ha->req_ring_index - cnt);
 337         }
 338         if (ha->req_q_cnt < (req_cnt + 2))
 339                 goto queuing_error;
 340
 341         /* Build command packet */
 342         ha->current_outstanding_cmd = handle;
 343         ha->outstanding_cmds[handle] = sp;
 344         sp->ha = ha;
 345         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 346         ha->req_q_cnt -= req_cnt;
 347
 348         cmd_pkt = (cmd_entry_t *)ha->request_ring_ptr;
 349         cmd_pkt->handle = handle;
 350         /* Zero out remaining portion of packet. */
 351         clr_ptr = (uint32_t *)cmd_pkt + 2;
 352         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 353         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 354
 355         /* Set target ID and LUN number*/
 356         SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
 357         cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
 358
 359         /* Update tagged queuing modifier */
 360         cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
 361
 362         /* Load SCSI command packet. */
 363         memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
 364         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 365
 366         /* Build IOCB segments */
 367         ha->isp_ops.build_iocbs(sp, cmd_pkt, tot_dsds);
 368
 369         /* Set total data segment count. */
 370         cmd_pkt->entry_count = (uint8_t)req_cnt;
 371         wmb();
 372
 373         /* Adjust ring index. */
 374         ha->req_ring_index++;
 375         if (ha->req_ring_index == ha->request_q_length) {
 376                 ha->req_ring_index = 0;
 377                 ha->request_ring_ptr = ha->request_ring;
 378         } else
 379                 ha->request_ring_ptr++;
 380
 381         sp->flags |= SRB_DMA_VALID;
 382
 383         /* Set chip new ring index. */
 384         WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
 385         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));     /* PCI Posting. */
 386
 387         /* Manage unprocessed RIO/ZIO commands in response queue. */
 388         if (ha->flags.process_response_queue &&
 389             ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
 390                 qla2x00_process_response_queue(ha);
 391
 392         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 393         return (QLA_SUCCESS);
 394
 395 queuing_error:
 396         if (tot_dsds)
 397                 scsi_dma_unmap(cmd);
 398
 399         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 400
 401         return (QLA_FUNCTION_FAILED);
 402 }
 403
 404 /**
 405  * qla2x00_marker() - Send a marker IOCB to the firmware.
 406  * @ha: HA context
 407  * @loop_id: loop ID
 408  * @lun: LUN
 409  * @type: marker modifier
 410  *
 411  * Can be called from both normal and interrupt context.
 412  *
 413  * Returns non-zero if a failure occured, else zero.
 414  */
 415 int
 416 __qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
 417     uint8_t type)
 418 {
 419         mrk_entry_t *mrk;
 420         struct mrk_entry_24xx *mrk24;
 421         scsi_qla_host_t *pha = to_qla_parent(ha);
 422
 423         mrk24 = NULL;
 424         mrk = (mrk_entry_t *)qla2x00_req_pkt(pha);
 425         if (mrk == NULL) {
 426                 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
 427                     __func__, ha->host_no));
 428
 429                 return (QLA_FUNCTION_FAILED);
 430         }
 431
 432         mrk->entry_type = MARKER_TYPE;
 433         mrk->modifier = type;
 434         if (type != MK_SYNC_ALL) {
 435                 if (IS_QLA24XX(ha) || IS_QLA54XX(ha)) {
 436                         mrk24 = (struct mrk_entry_24xx *) mrk;
 437                         mrk24->nport_handle = cpu_to_le16(loop_id);
 438                         mrk24->lun[1] = LSB(lun);
 439                         mrk24->lun[2] = MSB(lun);
 440                         host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun));
 441                         mrk24->vp_index = ha->vp_idx;
 442                 } else {
 443                         SET_TARGET_ID(ha, mrk->target, loop_id);
 444                         mrk->lun = cpu_to_le16(lun);
 445                 }
 446         }
 447         wmb();
 448
 449         qla2x00_isp_cmd(pha);
 450
 451         return (QLA_SUCCESS);
 452 }
 453
 454 int
 455 qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
 456     uint8_t type)
 457 {
 458         int ret;
 459         unsigned long flags = 0;
 460
 461         spin_lock_irqsave(&ha->hardware_lock, flags);
 462         ret = __qla2x00_marker(ha, loop_id, lun, type);
 463         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 464
 465         return (ret);
 466 }
 467
 468 /**
 469  * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
 470  * @ha: HA context
 471  *
 472  * Note: The caller must hold the hardware lock before calling this routine.
 473  *
 474  * Returns NULL if function failed, else, a pointer to the request packet.
 475  */
 476 static request_t *
 477 qla2x00_req_pkt(scsi_qla_host_t *ha)
 478 {
 479         device_reg_t __iomem *reg = ha->iobase;
 480         request_t       *pkt = NULL;
 481         uint16_t        cnt;
 482         uint32_t        *dword_ptr;
 483         uint32_t        timer;
 484         uint16_t        req_cnt = 1;
 485
 486         /* Wait 1 second for slot. */
 487         for (timer = HZ; timer; timer--) {
 488                 if ((req_cnt + 2) >= ha->req_q_cnt) {
 489                         /* Calculate number of free request entries. */
 490                         if (IS_QLA24XX(ha) || IS_QLA54XX(ha))
 491                                 cnt = (uint16_t)RD_REG_DWORD(
 492                                     &reg->isp24.req_q_out);
 493                         else
 494                                 cnt = qla2x00_debounce_register(
 495                                     ISP_REQ_Q_OUT(ha, &reg->isp));
 496                         if  (ha->req_ring_index < cnt)
 497                                 ha->req_q_cnt = cnt - ha->req_ring_index;
 498                         else
 499                                 ha->req_q_cnt = ha->request_q_length -
 500                                     (ha->req_ring_index - cnt);
 501                 }
 502                 /* If room for request in request ring. */
 503                 if ((req_cnt + 2) < ha->req_q_cnt) {
 504                         ha->req_q_cnt--;
 505                         pkt = ha->request_ring_ptr;
 506
 507                         /* Zero out packet. */
 508                         dword_ptr = (uint32_t *)pkt;
 509                         for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
 510                                 *dword_ptr++ = 0;
 511
 512                         /* Set system defined field. */
 513                         pkt->sys_define = (uint8_t)ha->req_ring_index;
 514
 515                         /* Set entry count. */
 516                         pkt->entry_count = 1;
 517
 518                         break;
 519                 }
 520
 521                 /* Release ring specific lock */
 522                 spin_unlock(&ha->hardware_lock);
 523
 524                 udelay(2);   /* 2 us */
 525
 526                 /* Check for pending interrupts. */
 527                 /* During init we issue marker directly */
 528                 if (!ha->marker_needed)
 529                         qla2x00_poll(ha);
 530
 531                 spin_lock_irq(&ha->hardware_lock);
 532         }
 533         if (!pkt) {
 534                 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
 535         }
 536
 537         return (pkt);
 538 }
 539
 540 /**
 541  * qla2x00_isp_cmd() - Modify the request ring pointer.
 542  * @ha: HA context
 543  *
 544  * Note: The caller must hold the hardware lock before calling this routine.
 545  */
 546 static void
 547 qla2x00_isp_cmd(scsi_qla_host_t *ha)
 548 {
 549         device_reg_t __iomem *reg = ha->iobase;
 550
 551         DEBUG5(printk("%s(): IOCB data:\n", __func__));
 552         DEBUG5(qla2x00_dump_buffer(
 553             (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE));
 554
 555         /* Adjust ring index. */
 556         ha->req_ring_index++;
 557         if (ha->req_ring_index == ha->request_q_length) {
 558                 ha->req_ring_index = 0;
 559                 ha->request_ring_ptr = ha->request_ring;
 560         } else
 561                 ha->request_ring_ptr++;
 562
 563         /* Set chip new ring index. */
 564         if (IS_QLA24XX(ha) || IS_QLA54XX(ha)) {
 565                 WRT_REG_DWORD(&reg->isp24.req_q_in, ha->req_ring_index);
 566                 RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
 567         } else {
 568                 WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp), ha->req_ring_index);
 569                 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
 570         }
 571
 572 }
 573
 574 /**
 575  * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
 576  * Continuation Type 1 IOCBs to allocate.
 577  *
 578  * @dsds: number of data segment decriptors needed
 579  *
 580  * Returns the number of IOCB entries needed to store @dsds.
 581  */
 582 static inline uint16_t
 583 qla24xx_calc_iocbs(uint16_t dsds)
 584 {
 585         uint16_t iocbs;
 586
 587         iocbs = 1;
 588         if (dsds > 1) {
 589                 iocbs += (dsds - 1) / 5;
 590                 if ((dsds - 1) % 5)
 591                         iocbs++;
 592         }
 593         return iocbs;
 594 }
 595
 596 /**
 597  * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
 598  * IOCB types.
 599  *
 600  * @sp: SRB command to process
 601  * @cmd_pkt: Command type 3 IOCB
 602  * @tot_dsds: Total number of segments to transfer
 603  */
 604 static inline void
 605 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 606     uint16_t tot_dsds)
 607 {
 608         uint16_t        avail_dsds;
 609         uint32_t        *cur_dsd;
 610         scsi_qla_host_t *ha;
 611         struct scsi_cmnd *cmd;
 612         struct scatterlist *sg;
 613         int i;
 614
 615         cmd = sp->cmd;
 616
 617         /* Update entry type to indicate Command Type 3 IOCB */
 618         *((uint32_t *)(&cmd_pkt->entry_type)) =
 619             __constant_cpu_to_le32(COMMAND_TYPE_7);
 620
 621         /* No data transfer */
 622         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 623                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 624                 return;
 625         }
 626
 627         ha = sp->ha;
 628
 629         /* Set transfer direction */
 630         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 631                 cmd_pkt->task_mgmt_flags =
 632                     __constant_cpu_to_le16(TMF_WRITE_DATA);
 633         else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 634                 cmd_pkt->task_mgmt_flags =
 635                     __constant_cpu_to_le16(TMF_READ_DATA);
 636
 637         /* One DSD is available in the Command Type 3 IOCB */
 638         avail_dsds = 1;
 639         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 640
 641         /* Load data segments */
 642
 643         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 644                 dma_addr_t      sle_dma;
 645                 cont_a64_entry_t *cont_pkt;
 646
 647                 /* Allocate additional continuation packets? */
 648                 if (avail_dsds == 0) {
 649                         /*
 650                          * Five DSDs are available in the Continuation
 651                          * Type 1 IOCB.
 652                          */
 653                         cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
 654                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 655                         avail_dsds = 5;
 656                 }
 657
 658                 sle_dma = sg_dma_address(sg);
 659                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 660                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 661                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 662                 avail_dsds--;
 663         }
 664 }
 665
 666
 667 /**
 668  * qla24xx_start_scsi() - Send a SCSI command to the ISP
 669  * @sp: command to send to the ISP
 670  *
 671  * Returns non-zero if a failure occured, else zero.
 672  */
 673 int
 674 qla24xx_start_scsi(srb_t *sp)
 675 {
 676         int             ret, nseg;
 677         unsigned long   flags;
 678         scsi_qla_host_t *ha;
 679         struct scsi_cmnd *cmd;
 680         uint32_t        *clr_ptr;
 681         uint32_t        index;
 682         uint32_t        handle;
 683         struct cmd_type_7 *cmd_pkt;
 684         uint16_t        cnt;
 685         uint16_t        req_cnt;
 686         uint16_t        tot_dsds;
 687         struct device_reg_24xx __iomem *reg;
 688
 689         /* Setup device pointers. */
 690         ret = 0;
 691         ha = sp->ha;
 692         reg = &ha->iobase->isp24;
 693         cmd = sp->cmd;
 694         /* So we know we haven't pci_map'ed anything yet */
 695         tot_dsds = 0;
 696
 697         /* Send marker if required */
 698         if (ha->marker_needed != 0) {
 699                 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
 700                         return QLA_FUNCTION_FAILED;
 701                 }
 702                 ha->marker_needed = 0;
 703         }
 704
 705         /* Acquire ring specific lock */
 706         spin_lock_irqsave(&ha->hardware_lock, flags);
 707
 708         /* Check for room in outstanding command list. */
 709         handle = ha->current_outstanding_cmd;
 710         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 711                 handle++;
 712                 if (handle == MAX_OUTSTANDING_COMMANDS)
 713                         handle = 1;
 714                 if (ha->outstanding_cmds[handle] == 0)
 715                         break;
 716         }
 717         if (index == MAX_OUTSTANDING_COMMANDS)
 718                 goto queuing_error;
 719
 720         /* Map the sg table so we have an accurate count of sg entries needed */
 721         if (scsi_sg_count(cmd)) {
 722                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
 723                     scsi_sg_count(cmd), cmd->sc_data_direction);
 724                 if (unlikely(!nseg))
 725                         goto queuing_error;
 726         } else
 727                 nseg = 0;
 728
 729         tot_dsds = nseg;
 730
 731         req_cnt = qla24xx_calc_iocbs(tot_dsds);
 732         if (ha->req_q_cnt < (req_cnt + 2)) {
 733                 cnt = (uint16_t)RD_REG_DWORD_RELAXED(&reg->req_q_out);
 734                 if (ha->req_ring_index < cnt)
 735                         ha->req_q_cnt = cnt - ha->req_ring_index;
 736                 else
 737                         ha->req_q_cnt = ha->request_q_length -
 738                                 (ha->req_ring_index - cnt);
 739         }
 740         if (ha->req_q_cnt < (req_cnt + 2))
 741                 goto queuing_error;
 742
 743         /* Build command packet. */
 744         ha->current_outstanding_cmd = handle;
 745         ha->outstanding_cmds[handle] = sp;
 746         sp->ha = ha;
 747         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 748         ha->req_q_cnt -= req_cnt;
 749
 750         cmd_pkt = (struct cmd_type_7 *)ha->request_ring_ptr;
 751         cmd_pkt->handle = handle;
 752
 753         /* Zero out remaining portion of packet. */
 754         /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
 755         clr_ptr = (uint32_t *)cmd_pkt + 2;
 756         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 757         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 758
 759         /* Set NPORT-ID and LUN number*/
 760         cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
 761         cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
 762         cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
 763         cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
 764         cmd_pkt->vp_index = sp->fcport->vp_idx;
 765
 766         int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
 767         host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
 768
 769         /* Load SCSI command packet. */
 770         memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
 771         host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
 772
 773         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 774
 775         /* Build IOCB segments */
 776         qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
 777
 778         /* Set total data segment count. */
 779         cmd_pkt->entry_count = (uint8_t)req_cnt;
 780         wmb();
 781
 782         /* Adjust ring index. */
 783         ha->req_ring_index++;
 784         if (ha->req_ring_index == ha->request_q_length) {
 785                 ha->req_ring_index = 0;
 786                 ha->request_ring_ptr = ha->request_ring;
 787         } else
 788                 ha->request_ring_ptr++;
 789
 790         sp->flags |= SRB_DMA_VALID;
 791
 792         /* Set chip new ring index. */
 793         WRT_REG_DWORD(&reg->req_q_in, ha->req_ring_index);
 794         RD_REG_DWORD_RELAXED(&reg->req_q_in);           /* PCI Posting. */
 795
 796         /* Manage unprocessed RIO/ZIO commands in response queue. */
 797         if (ha->flags.process_response_queue &&
 798             ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
 799                 qla24xx_process_response_queue(ha);
 800
 801         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 802         return QLA_SUCCESS;
 803
 804 queuing_error:
 805         if (tot_dsds)
 806                 scsi_dma_unmap(cmd);
 807
 808         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 809
 810         return QLA_FUNCTION_FAILED;
 811 }