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

   1 /*
   2  * QLogic Fibre Channel HBA Driver
   3  * Copyright (c)  2003-2008 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(struct scsi_qla_host *, struct req_que *,
  15                                                         struct rsp_que *rsp);
  16 static void qla2x00_isp_cmd(struct scsi_qla_host *, struct req_que *);
  17
  18 /**
  19  * qla2x00_get_cmd_direction() - Determine control_flag data direction.
  20  * @cmd: SCSI command
  21  *
  22  * Returns the proper CF_* direction based on CDB.
  23  */
  24 static inline uint16_t
  25 qla2x00_get_cmd_direction(srb_t *sp)
  26 {
  27         uint16_t cflags;
  28
  29         cflags = 0;
  30
  31         /* Set transfer direction */
  32         if (sp->cmd->sc_data_direction == DMA_TO_DEVICE) {
  33                 cflags = CF_WRITE;
  34                 sp->fcport->vha->hw->qla_stats.output_bytes +=
  35                     scsi_bufflen(sp->cmd);
  36         } else if (sp->cmd->sc_data_direction == DMA_FROM_DEVICE) {
  37                 cflags = CF_READ;
  38                 sp->fcport->vha->hw->qla_stats.input_bytes +=
  39                     scsi_bufflen(sp->cmd);
  40         }
  41         return (cflags);
  42 }
  43
  44 /**
  45  * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
  46  * Continuation Type 0 IOCBs to allocate.
  47  *
  48  * @dsds: number of data segment decriptors needed
  49  *
  50  * Returns the number of IOCB entries needed to store @dsds.
  51  */
  52 uint16_t
  53 qla2x00_calc_iocbs_32(uint16_t dsds)
  54 {
  55         uint16_t iocbs;
  56
  57         iocbs = 1;
  58         if (dsds > 3) {
  59                 iocbs += (dsds - 3) / 7;
  60                 if ((dsds - 3) % 7)
  61                         iocbs++;
  62         }
  63         return (iocbs);
  64 }
  65
  66 /**
  67  * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
  68  * Continuation Type 1 IOCBs to allocate.
  69  *
  70  * @dsds: number of data segment decriptors needed
  71  *
  72  * Returns the number of IOCB entries needed to store @dsds.
  73  */
  74 uint16_t
  75 qla2x00_calc_iocbs_64(uint16_t dsds)
  76 {
  77         uint16_t iocbs;
  78
  79         iocbs = 1;
  80         if (dsds > 2) {
  81                 iocbs += (dsds - 2) / 5;
  82                 if ((dsds - 2) % 5)
  83                         iocbs++;
  84         }
  85         return (iocbs);
  86 }
  87
  88 /**
  89  * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
  90  * @ha: HA context
  91  *
  92  * Returns a pointer to the Continuation Type 0 IOCB packet.
  93  */
  94 static inline cont_entry_t *
  95 qla2x00_prep_cont_type0_iocb(struct req_que *req, struct scsi_qla_host *vha)
  96 {
  97         cont_entry_t *cont_pkt;
  98         /* Adjust ring index. */
  99         req->ring_index++;
 100         if (req->ring_index == req->length) {
 101                 req->ring_index = 0;
 102                 req->ring_ptr = req->ring;
 103         } else {
 104                 req->ring_ptr++;
 105         }
 106
 107         cont_pkt = (cont_entry_t *)req->ring_ptr;
 108
 109         /* Load packet defaults. */
 110         *((uint32_t *)(&cont_pkt->entry_type)) =
 111             __constant_cpu_to_le32(CONTINUE_TYPE);
 112
 113         return (cont_pkt);
 114 }
 115
 116 /**
 117  * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
 118  * @ha: HA context
 119  *
 120  * Returns a pointer to the continuation type 1 IOCB packet.
 121  */
 122 static inline cont_a64_entry_t *
 123 qla2x00_prep_cont_type1_iocb(struct req_que *req, scsi_qla_host_t *vha)
 124 {
 125         cont_a64_entry_t *cont_pkt;
 126
 127         /* Adjust ring index. */
 128         req->ring_index++;
 129         if (req->ring_index == req->length) {
 130                 req->ring_index = 0;
 131                 req->ring_ptr = req->ring;
 132         } else {
 133                 req->ring_ptr++;
 134         }
 135
 136         cont_pkt = (cont_a64_entry_t *)req->ring_ptr;
 137
 138         /* Load packet defaults. */
 139         *((uint32_t *)(&cont_pkt->entry_type)) =
 140             __constant_cpu_to_le32(CONTINUE_A64_TYPE);
 141
 142         return (cont_pkt);
 143 }
 144
 145 /**
 146  * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
 147  * capable IOCB types.
 148  *
 149  * @sp: SRB command to process
 150  * @cmd_pkt: Command type 2 IOCB
 151  * @tot_dsds: Total number of segments to transfer
 152  */
 153 void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
 154     uint16_t tot_dsds)
 155 {
 156         uint16_t        avail_dsds;
 157         uint32_t        *cur_dsd;
 158         scsi_qla_host_t *vha;
 159         struct scsi_cmnd *cmd;
 160         struct scatterlist *sg;
 161         int i;
 162         struct req_que *req;
 163
 164         cmd = sp->cmd;
 165
 166         /* Update entry type to indicate Command Type 2 IOCB */
 167         *((uint32_t *)(&cmd_pkt->entry_type)) =
 168             __constant_cpu_to_le32(COMMAND_TYPE);
 169
 170         /* No data transfer */
 171         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 172                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 173                 return;
 174         }
 175
 176         vha = sp->fcport->vha;
 177         req = sp->que;
 178
 179         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(sp));
 180
 181         /* Three DSDs are available in the Command Type 2 IOCB */
 182         avail_dsds = 3;
 183         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 184
 185         /* Load data segments */
 186         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 187                 cont_entry_t *cont_pkt;
 188
 189                 /* Allocate additional continuation packets? */
 190                 if (avail_dsds == 0) {
 191                         /*
 192                          * Seven DSDs are available in the Continuation
 193                          * Type 0 IOCB.
 194                          */
 195                         cont_pkt = qla2x00_prep_cont_type0_iocb(req, vha);
 196                         cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
 197                         avail_dsds = 7;
 198                 }
 199
 200                 *cur_dsd++ = cpu_to_le32(sg_dma_address(sg));
 201                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 202                 avail_dsds--;
 203         }
 204 }
 205
 206 /**
 207  * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
 208  * capable IOCB types.
 209  *
 210  * @sp: SRB command to process
 211  * @cmd_pkt: Command type 3 IOCB
 212  * @tot_dsds: Total number of segments to transfer
 213  */
 214 void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
 215     uint16_t tot_dsds)
 216 {
 217         uint16_t        avail_dsds;
 218         uint32_t        *cur_dsd;
 219         scsi_qla_host_t *vha;
 220         struct scsi_cmnd *cmd;
 221         struct scatterlist *sg;
 222         int i;
 223         struct req_que *req;
 224
 225         cmd = sp->cmd;
 226
 227         /* Update entry type to indicate Command Type 3 IOCB */
 228         *((uint32_t *)(&cmd_pkt->entry_type)) =
 229             __constant_cpu_to_le32(COMMAND_A64_TYPE);
 230
 231         /* No data transfer */
 232         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 233                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 234                 return;
 235         }
 236
 237         vha = sp->fcport->vha;
 238         req = sp->que;
 239
 240         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(sp));
 241
 242         /* Two DSDs are available in the Command Type 3 IOCB */
 243         avail_dsds = 2;
 244         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 245
 246         /* Load data segments */
 247         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 248                 dma_addr_t      sle_dma;
 249                 cont_a64_entry_t *cont_pkt;
 250
 251                 /* Allocate additional continuation packets? */
 252                 if (avail_dsds == 0) {
 253                         /*
 254                          * Five DSDs are available in the Continuation
 255                          * Type 1 IOCB.
 256                          */
 257                         cont_pkt = qla2x00_prep_cont_type1_iocb(req, vha);
 258                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 259                         avail_dsds = 5;
 260                 }
 261
 262                 sle_dma = sg_dma_address(sg);
 263                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 264                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 265                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 266                 avail_dsds--;
 267         }
 268 }
 269
 270 /**
 271  * qla2x00_start_scsi() - Send a SCSI command to the ISP
 272  * @sp: command to send to the ISP
 273  *
 274  * Returns non-zero if a failure occurred, else zero.
 275  */
 276 int
 277 qla2x00_start_scsi(srb_t *sp)
 278 {
 279         int             ret, nseg;
 280         unsigned long   flags;
 281         scsi_qla_host_t *vha;
 282         struct scsi_cmnd *cmd;
 283         uint32_t        *clr_ptr;
 284         uint32_t        index;
 285         uint32_t        handle;
 286         cmd_entry_t     *cmd_pkt;
 287         uint16_t        cnt;
 288         uint16_t        req_cnt;
 289         uint16_t        tot_dsds;
 290         struct device_reg_2xxx __iomem *reg;
 291         struct qla_hw_data *ha;
 292         struct req_que *req;
 293         struct rsp_que *rsp;
 294
 295         /* Setup device pointers. */
 296         ret = 0;
 297         vha = sp->fcport->vha;
 298         ha = vha->hw;
 299         reg = &ha->iobase->isp;
 300         cmd = sp->cmd;
 301         req = ha->req_q_map[0];
 302         rsp = ha->rsp_q_map[0];
 303         /* So we know we haven't pci_map'ed anything yet */
 304         tot_dsds = 0;
 305
 306         /* Send marker if required */
 307         if (vha->marker_needed != 0) {
 308                 if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL)
 309                                                         != QLA_SUCCESS)
 310                         return (QLA_FUNCTION_FAILED);
 311                 vha->marker_needed = 0;
 312         }
 313
 314         /* Acquire ring specific lock */
 315         spin_lock_irqsave(&ha->hardware_lock, flags);
 316
 317         /* Check for room in outstanding command list. */
 318         handle = req->current_outstanding_cmd;
 319         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 320                 handle++;
 321                 if (handle == MAX_OUTSTANDING_COMMANDS)
 322                         handle = 1;
 323                 if (!req->outstanding_cmds[handle])
 324                         break;
 325         }
 326         if (index == MAX_OUTSTANDING_COMMANDS)
 327                 goto queuing_error;
 328
 329         /* Map the sg table so we have an accurate count of sg entries needed */
 330         if (scsi_sg_count(cmd)) {
 331                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
 332                     scsi_sg_count(cmd), cmd->sc_data_direction);
 333                 if (unlikely(!nseg))
 334                         goto queuing_error;
 335         } else
 336                 nseg = 0;
 337
 338         tot_dsds = nseg;
 339
 340         /* Calculate the number of request entries needed. */
 341         req_cnt = ha->isp_ops->calc_req_entries(tot_dsds);
 342         if (req->cnt < (req_cnt + 2)) {
 343                 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
 344                 if (req->ring_index < cnt)
 345                         req->cnt = cnt - req->ring_index;
 346                 else
 347                         req->cnt = req->length -
 348                             (req->ring_index - cnt);
 349         }
 350         if (req->cnt < (req_cnt + 2))
 351                 goto queuing_error;
 352
 353         /* Build command packet */
 354         req->current_outstanding_cmd = handle;
 355         req->outstanding_cmds[handle] = sp;
 356         sp->que = req;
 357         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 358         req->cnt -= req_cnt;
 359
 360         cmd_pkt = (cmd_entry_t *)req->ring_ptr;
 361         cmd_pkt->handle = handle;
 362         /* Zero out remaining portion of packet. */
 363         clr_ptr = (uint32_t *)cmd_pkt + 2;
 364         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 365         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 366
 367         /* Set target ID and LUN number*/
 368         SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
 369         cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
 370
 371         /* Update tagged queuing modifier */
 372         cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
 373
 374         /* Load SCSI command packet. */
 375         memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
 376         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 377
 378         /* Build IOCB segments */
 379         ha->isp_ops->build_iocbs(sp, cmd_pkt, tot_dsds);
 380
 381         /* Set total data segment count. */
 382         cmd_pkt->entry_count = (uint8_t)req_cnt;
 383         wmb();
 384
 385         /* Adjust ring index. */
 386         req->ring_index++;
 387         if (req->ring_index == req->length) {
 388                 req->ring_index = 0;
 389                 req->ring_ptr = req->ring;
 390         } else
 391                 req->ring_ptr++;
 392
 393         sp->flags |= SRB_DMA_VALID;
 394
 395         /* Set chip new ring index. */
 396         WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), req->ring_index);
 397         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));     /* PCI Posting. */
 398
 399         /* Manage unprocessed RIO/ZIO commands in response queue. */
 400         if (vha->flags.process_response_queue &&
 401             rsp->ring_ptr->signature != RESPONSE_PROCESSED)
 402                 qla2x00_process_response_queue(rsp);
 403
 404         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 405         return (QLA_SUCCESS);
 406
 407 queuing_error:
 408         if (tot_dsds)
 409                 scsi_dma_unmap(cmd);
 410
 411         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 412
 413         return (QLA_FUNCTION_FAILED);
 414 }
 415
 416 /**
 417  * qla2x00_marker() - Send a marker IOCB to the firmware.
 418  * @ha: HA context
 419  * @loop_id: loop ID
 420  * @lun: LUN
 421  * @type: marker modifier
 422  *
 423  * Can be called from both normal and interrupt context.
 424  *
 425  * Returns non-zero if a failure occurred, else zero.
 426  */
 427 int
 428 __qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
 429                         struct rsp_que *rsp, uint16_t loop_id,
 430                         uint16_t lun, uint8_t type)
 431 {
 432         mrk_entry_t *mrk;
 433         struct mrk_entry_24xx *mrk24;
 434         struct qla_hw_data *ha = vha->hw;
 435         scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
 436
 437         mrk24 = NULL;
 438         mrk = (mrk_entry_t *)qla2x00_req_pkt(vha, req, rsp);
 439         if (mrk == NULL) {
 440                 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
 441                     __func__, base_vha->host_no));
 442
 443                 return (QLA_FUNCTION_FAILED);
 444         }
 445
 446         mrk->entry_type = MARKER_TYPE;
 447         mrk->modifier = type;
 448         if (type != MK_SYNC_ALL) {
 449                 if (IS_FWI2_CAPABLE(ha)) {
 450                         mrk24 = (struct mrk_entry_24xx *) mrk;
 451                         mrk24->nport_handle = cpu_to_le16(loop_id);
 452                         mrk24->lun[1] = LSB(lun);
 453                         mrk24->lun[2] = MSB(lun);
 454                         host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun));
 455                         mrk24->vp_index = vha->vp_idx;
 456                 } else {
 457                         SET_TARGET_ID(ha, mrk->target, loop_id);
 458                         mrk->lun = cpu_to_le16(lun);
 459                 }
 460         }
 461         wmb();
 462
 463         qla2x00_isp_cmd(vha, req);
 464
 465         return (QLA_SUCCESS);
 466 }
 467
 468 int
 469 qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
 470                 struct rsp_que *rsp, uint16_t loop_id, uint16_t lun,
 471                 uint8_t type)
 472 {
 473         int ret;
 474         unsigned long flags = 0;
 475
 476         spin_lock_irqsave(&vha->hw->hardware_lock, flags);
 477         ret = __qla2x00_marker(vha, req, rsp, loop_id, lun, type);
 478         spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
 479
 480         return (ret);
 481 }
 482
 483 /**
 484  * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
 485  * @ha: HA context
 486  *
 487  * Note: The caller must hold the hardware lock before calling this routine.
 488  *
 489  * Returns NULL if function failed, else, a pointer to the request packet.
 490  */
 491 static request_t *
 492 qla2x00_req_pkt(struct scsi_qla_host *vha, struct req_que *req,
 493                 struct rsp_que *rsp)
 494 {
 495         struct qla_hw_data *ha = vha->hw;
 496         device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);
 497         request_t       *pkt = NULL;
 498         uint16_t        cnt;
 499         uint32_t        *dword_ptr;
 500         uint32_t        timer;
 501         uint16_t        req_cnt = 1;
 502
 503         /* Wait 1 second for slot. */
 504         for (timer = HZ; timer; timer--) {
 505                 if ((req_cnt + 2) >= req->cnt) {
 506                         /* Calculate number of free request entries. */
 507                         if (ha->mqenable)
 508                                 cnt = (uint16_t)
 509                                         RD_REG_DWORD(&reg->isp25mq.req_q_out);
 510                         else {
 511                                 if (IS_FWI2_CAPABLE(ha))
 512                                         cnt = (uint16_t)RD_REG_DWORD(
 513                                                 &reg->isp24.req_q_out);
 514                                 else
 515                                         cnt = qla2x00_debounce_register(
 516                                                 ISP_REQ_Q_OUT(ha, &reg->isp));
 517                         }
 518                         if  (req->ring_index < cnt)
 519                                 req->cnt = cnt - req->ring_index;
 520                         else
 521                                 req->cnt = req->length -
 522                                     (req->ring_index - cnt);
 523                 }
 524                 /* If room for request in request ring. */
 525                 if ((req_cnt + 2) < req->cnt) {
 526                         req->cnt--;
 527                         pkt = req->ring_ptr;
 528
 529                         /* Zero out packet. */
 530                         dword_ptr = (uint32_t *)pkt;
 531                         for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
 532                                 *dword_ptr++ = 0;
 533
 534                         /* Set system defined field. */
 535                         pkt->sys_define = (uint8_t)req->ring_index;
 536
 537                         /* Set entry count. */
 538                         pkt->entry_count = 1;
 539
 540                         break;
 541                 }
 542
 543                 /* Release ring specific lock */
 544                 spin_unlock_irq(&ha->hardware_lock);
 545
 546                 udelay(2);   /* 2 us */
 547
 548                 /* Check for pending interrupts. */
 549                 /* During init we issue marker directly */
 550                 if (!vha->marker_needed && !vha->flags.init_done)
 551                         qla2x00_poll(rsp);
 552                 spin_lock_irq(&ha->hardware_lock);
 553         }
 554         if (!pkt) {
 555                 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
 556         }
 557
 558         return (pkt);
 559 }
 560
 561 /**
 562  * qla2x00_isp_cmd() - Modify the request ring pointer.
 563  * @ha: HA context
 564  *
 565  * Note: The caller must hold the hardware lock before calling this routine.
 566  */
 567 static void
 568 qla2x00_isp_cmd(struct scsi_qla_host *vha, struct req_que *req)
 569 {
 570         struct qla_hw_data *ha = vha->hw;
 571         device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);
 572         struct device_reg_2xxx __iomem *ioreg = &ha->iobase->isp;
 573
 574         DEBUG5(printk("%s(): IOCB data:\n", __func__));
 575         DEBUG5(qla2x00_dump_buffer(
 576             (uint8_t *)req->ring_ptr, REQUEST_ENTRY_SIZE));
 577
 578         /* Adjust ring index. */
 579         req->ring_index++;
 580         if (req->ring_index == req->length) {
 581                 req->ring_index = 0;
 582                 req->ring_ptr = req->ring;
 583         } else
 584                 req->ring_ptr++;
 585
 586         /* Set chip new ring index. */
 587         if (ha->mqenable) {
 588                 WRT_REG_DWORD(&reg->isp25mq.req_q_in, req->ring_index);
 589                 RD_REG_DWORD(&ioreg->hccr);
 590         }
 591         else {
 592                 if (IS_FWI2_CAPABLE(ha)) {
 593                         WRT_REG_DWORD(&reg->isp24.req_q_in, req->ring_index);
 594                         RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
 595                 } else {
 596                         WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp),
 597                                 req->ring_index);
 598                         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
 599                 }
 600         }
 601
 602 }
 603
 604 /**
 605  * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
 606  * Continuation Type 1 IOCBs to allocate.
 607  *
 608  * @dsds: number of data segment decriptors needed
 609  *
 610  * Returns the number of IOCB entries needed to store @dsds.
 611  */
 612 static inline uint16_t
 613 qla24xx_calc_iocbs(uint16_t dsds)
 614 {
 615         uint16_t iocbs;
 616
 617         iocbs = 1;
 618         if (dsds > 1) {
 619                 iocbs += (dsds - 1) / 5;
 620                 if ((dsds - 1) % 5)
 621                         iocbs++;
 622         }
 623         return iocbs;
 624 }
 625
 626 /**
 627  * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
 628  * IOCB types.
 629  *
 630  * @sp: SRB command to process
 631  * @cmd_pkt: Command type 3 IOCB
 632  * @tot_dsds: Total number of segments to transfer
 633  */
 634 static inline void
 635 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 636     uint16_t tot_dsds)
 637 {
 638         uint16_t        avail_dsds;
 639         uint32_t        *cur_dsd;
 640         scsi_qla_host_t *vha;
 641         struct scsi_cmnd *cmd;
 642         struct scatterlist *sg;
 643         int i;
 644         struct req_que *req;
 645
 646         cmd = sp->cmd;
 647
 648         /* Update entry type to indicate Command Type 3 IOCB */
 649         *((uint32_t *)(&cmd_pkt->entry_type)) =
 650             __constant_cpu_to_le32(COMMAND_TYPE_7);
 651
 652         /* No data transfer */
 653         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 654                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 655                 return;
 656         }
 657
 658         vha = sp->fcport->vha;
 659         req = sp->que;
 660
 661         /* Set transfer direction */
 662         if (cmd->sc_data_direction == DMA_TO_DEVICE) {
 663                 cmd_pkt->task_mgmt_flags =
 664                     __constant_cpu_to_le16(TMF_WRITE_DATA);
 665                 sp->fcport->vha->hw->qla_stats.output_bytes +=
 666                     scsi_bufflen(sp->cmd);
 667         } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
 668                 cmd_pkt->task_mgmt_flags =
 669                     __constant_cpu_to_le16(TMF_READ_DATA);
 670                 sp->fcport->vha->hw->qla_stats.input_bytes +=
 671                     scsi_bufflen(sp->cmd);
 672         }
 673
 674         /* One DSD is available in the Command Type 3 IOCB */
 675         avail_dsds = 1;
 676         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 677
 678         /* Load data segments */
 679
 680         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 681                 dma_addr_t      sle_dma;
 682                 cont_a64_entry_t *cont_pkt;
 683
 684                 /* Allocate additional continuation packets? */
 685                 if (avail_dsds == 0) {
 686                         /*
 687                          * Five DSDs are available in the Continuation
 688                          * Type 1 IOCB.
 689                          */
 690                         cont_pkt = qla2x00_prep_cont_type1_iocb(req, vha);
 691                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 692                         avail_dsds = 5;
 693                 }
 694
 695                 sle_dma = sg_dma_address(sg);
 696                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 697                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 698                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 699                 avail_dsds--;
 700         }
 701 }
 702
 703
 704 /**
 705  * qla24xx_start_scsi() - Send a SCSI command to the ISP
 706  * @sp: command to send to the ISP
 707  *
 708  * Returns non-zero if a failure occurred, else zero.
 709  */
 710 int
 711 qla24xx_start_scsi(srb_t *sp)
 712 {
 713         int             ret, nseg;
 714         unsigned long   flags;
 715         uint32_t        *clr_ptr;
 716         uint32_t        index;
 717         uint32_t        handle;
 718         struct cmd_type_7 *cmd_pkt;
 719         uint16_t        cnt;
 720         uint16_t        req_cnt;
 721         uint16_t        tot_dsds;
 722         struct req_que *req = NULL;
 723         struct rsp_que *rsp = NULL;
 724         struct scsi_cmnd *cmd = sp->cmd;
 725         struct scsi_qla_host *vha = sp->fcport->vha;
 726         struct qla_hw_data *ha = vha->hw;
 727         uint16_t que_id;
 728
 729         /* Setup device pointers. */
 730         ret = 0;
 731         que_id = vha->req_ques[0];
 732
 733         req = ha->req_q_map[que_id];
 734         sp->que = req;
 735
 736         if (req->rsp)
 737                 rsp = req->rsp;
 738         else
 739                 rsp = ha->rsp_q_map[que_id];
 740         /* So we know we haven't pci_map'ed anything yet */
 741         tot_dsds = 0;
 742
 743         /* Send marker if required */
 744         if (vha->marker_needed != 0) {
 745                 if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL)
 746                                                         != QLA_SUCCESS)
 747                         return QLA_FUNCTION_FAILED;
 748                 vha->marker_needed = 0;
 749         }
 750
 751         /* Acquire ring specific lock */
 752         spin_lock_irqsave(&ha->hardware_lock, flags);
 753
 754         /* Check for room in outstanding command list. */
 755         handle = req->current_outstanding_cmd;
 756         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 757                 handle++;
 758                 if (handle == MAX_OUTSTANDING_COMMANDS)
 759                         handle = 1;
 760                 if (!req->outstanding_cmds[handle])
 761                         break;
 762         }
 763         if (index == MAX_OUTSTANDING_COMMANDS)
 764                 goto queuing_error;
 765
 766         /* Map the sg table so we have an accurate count of sg entries needed */
 767         if (scsi_sg_count(cmd)) {
 768                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
 769                     scsi_sg_count(cmd), cmd->sc_data_direction);
 770                 if (unlikely(!nseg))
 771                         goto queuing_error;
 772         } else
 773                 nseg = 0;
 774
 775         tot_dsds = nseg;
 776
 777         req_cnt = qla24xx_calc_iocbs(tot_dsds);
 778         if (req->cnt < (req_cnt + 2)) {
 779                 cnt = RD_REG_DWORD_RELAXED(req->req_q_out);
 780
 781                 if (req->ring_index < cnt)
 782                         req->cnt = cnt - req->ring_index;
 783                 else
 784                         req->cnt = req->length -
 785                                 (req->ring_index - cnt);
 786         }
 787         if (req->cnt < (req_cnt + 2))
 788                 goto queuing_error;
 789
 790         /* Build command packet. */
 791         req->current_outstanding_cmd = handle;
 792         req->outstanding_cmds[handle] = sp;
 793         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 794         req->cnt -= req_cnt;
 795
 796         cmd_pkt = (struct cmd_type_7 *)req->ring_ptr;
 797         cmd_pkt->handle = handle;
 798
 799         /* Zero out remaining portion of packet. */
 800         /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
 801         clr_ptr = (uint32_t *)cmd_pkt + 2;
 802         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 803         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 804
 805         /* Set NPORT-ID and LUN number*/
 806         cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
 807         cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
 808         cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
 809         cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
 810         cmd_pkt->vp_index = sp->fcport->vp_idx;
 811
 812         int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
 813         host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
 814
 815         /* Load SCSI command packet. */
 816         memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
 817         host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
 818
 819         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 820
 821         /* Build IOCB segments */
 822         qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
 823
 824         /* Set total data segment count. */
 825         cmd_pkt->entry_count = (uint8_t)req_cnt;
 826         wmb();
 827
 828         /* Adjust ring index. */
 829         req->ring_index++;
 830         if (req->ring_index == req->length) {
 831                 req->ring_index = 0;
 832                 req->ring_ptr = req->ring;
 833         } else
 834                 req->ring_ptr++;
 835
 836         sp->flags |= SRB_DMA_VALID;
 837
 838         /* Set chip new ring index. */
 839         WRT_REG_DWORD(req->req_q_in, req->ring_index);
 840         RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
 841
 842         /* Manage unprocessed RIO/ZIO commands in response queue. */
 843         if (vha->flags.process_response_queue &&
 844                 rsp->ring_ptr->signature != RESPONSE_PROCESSED)
 845                 qla24xx_process_response_queue(rsp);
 846
 847         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 848         return QLA_SUCCESS;
 849
 850 queuing_error:
 851         if (tot_dsds)
 852                 scsi_dma_unmap(cmd);
 853
 854         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 855
 856         return QLA_FUNCTION_FAILED;
 857 }