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
  19 /**
  20  * qla2x00_get_cmd_direction() - Determine control_flag data direction.
  21  * @cmd: SCSI command
  22  *
  23  * Returns the proper CF_* direction based on CDB.
  24  */
  25 static inline uint16_t
  26 qla2x00_get_cmd_direction(struct scsi_cmnd *cmd)
  27 {
  28         uint16_t cflags;
  29
  30         cflags = 0;
  31
  32         /* Set transfer direction */
  33         if (cmd->sc_data_direction == DMA_TO_DEVICE)
  34                 cflags = CF_WRITE;
  35         else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
  36                 cflags = CF_READ;
  37         return (cflags);
  38 }
  39
  40 /**
  41  * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
  42  * Continuation Type 0 IOCBs to allocate.
  43  *
  44  * @dsds: number of data segment decriptors needed
  45  *
  46  * Returns the number of IOCB entries needed to store @dsds.
  47  */
  48 uint16_t
  49 qla2x00_calc_iocbs_32(uint16_t dsds)
  50 {
  51         uint16_t iocbs;
  52
  53         iocbs = 1;
  54         if (dsds > 3) {
  55                 iocbs += (dsds - 3) / 7;
  56                 if ((dsds - 3) % 7)
  57                         iocbs++;
  58         }
  59         return (iocbs);
  60 }
  61
  62 /**
  63  * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
  64  * Continuation Type 1 IOCBs to allocate.
  65  *
  66  * @dsds: number of data segment decriptors needed
  67  *
  68  * Returns the number of IOCB entries needed to store @dsds.
  69  */
  70 uint16_t
  71 qla2x00_calc_iocbs_64(uint16_t dsds)
  72 {
  73         uint16_t iocbs;
  74
  75         iocbs = 1;
  76         if (dsds > 2) {
  77                 iocbs += (dsds - 2) / 5;
  78                 if ((dsds - 2) % 5)
  79                         iocbs++;
  80         }
  81         return (iocbs);
  82 }
  83
  84 /**
  85  * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
  86  * @ha: HA context
  87  *
  88  * Returns a pointer to the Continuation Type 0 IOCB packet.
  89  */
  90 static inline cont_entry_t *
  91 qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *ha)
  92 {
  93         cont_entry_t *cont_pkt;
  94
  95         /* Adjust ring index. */
  96         ha->req_ring_index++;
  97         if (ha->req_ring_index == ha->request_q_length) {
  98                 ha->req_ring_index = 0;
  99                 ha->request_ring_ptr = ha->request_ring;
 100         } else {
 101                 ha->request_ring_ptr++;
 102         }
 103
 104         cont_pkt = (cont_entry_t *)ha->request_ring_ptr;
 105
 106         /* Load packet defaults. */
 107         *((uint32_t *)(&cont_pkt->entry_type)) =
 108             __constant_cpu_to_le32(CONTINUE_TYPE);
 109
 110         return (cont_pkt);
 111 }
 112
 113 /**
 114  * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
 115  * @ha: HA context
 116  *
 117  * Returns a pointer to the continuation type 1 IOCB packet.
 118  */
 119 static inline cont_a64_entry_t *
 120 qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *ha)
 121 {
 122         cont_a64_entry_t *cont_pkt;
 123
 124         /* Adjust ring index. */
 125         ha->req_ring_index++;
 126         if (ha->req_ring_index == ha->request_q_length) {
 127                 ha->req_ring_index = 0;
 128                 ha->request_ring_ptr = ha->request_ring;
 129         } else {
 130                 ha->request_ring_ptr++;
 131         }
 132
 133         cont_pkt = (cont_a64_entry_t *)ha->request_ring_ptr;
 134
 135         /* Load packet defaults. */
 136         *((uint32_t *)(&cont_pkt->entry_type)) =
 137             __constant_cpu_to_le32(CONTINUE_A64_TYPE);
 138
 139         return (cont_pkt);
 140 }
 141
 142 /**
 143  * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
 144  * capable IOCB types.
 145  *
 146  * @sp: SRB command to process
 147  * @cmd_pkt: Command type 2 IOCB
 148  * @tot_dsds: Total number of segments to transfer
 149  */
 150 void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
 151     uint16_t tot_dsds)
 152 {
 153         uint16_t        avail_dsds;
 154         uint32_t        *cur_dsd;
 155         scsi_qla_host_t *ha;
 156         struct scsi_cmnd *cmd;
 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 (cmd->request_bufflen == 0 || 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         if (cmd->use_sg != 0) {
 180                 struct  scatterlist *cur_seg;
 181                 struct  scatterlist *end_seg;
 182
 183                 cur_seg = (struct scatterlist *)cmd->request_buffer;
 184                 end_seg = cur_seg + tot_dsds;
 185                 while (cur_seg < end_seg) {
 186                         cont_entry_t    *cont_pkt;
 187
 188                         /* Allocate additional continuation packets? */
 189                         if (avail_dsds == 0) {
 190                                 /*
 191                                  * Seven DSDs are available in the Continuation
 192                                  * Type 0 IOCB.
 193                                  */
 194                                 cont_pkt = qla2x00_prep_cont_type0_iocb(ha);
 195                                 cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
 196                                 avail_dsds = 7;
 197                         }
 198
 199                         *cur_dsd++ = cpu_to_le32(sg_dma_address(cur_seg));
 200                         *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
 201                         avail_dsds--;
 202
 203                         cur_seg++;
 204                 }
 205         } else {
 206                 *cur_dsd++ = cpu_to_le32(sp->dma_handle);
 207                 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
 208         }
 209 }
 210
 211 /**
 212  * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
 213  * capable IOCB types.
 214  *
 215  * @sp: SRB command to process
 216  * @cmd_pkt: Command type 3 IOCB
 217  * @tot_dsds: Total number of segments to transfer
 218  */
 219 void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
 220     uint16_t tot_dsds)
 221 {
 222         uint16_t        avail_dsds;
 223         uint32_t        *cur_dsd;
 224         scsi_qla_host_t *ha;
 225         struct scsi_cmnd *cmd;
 226
 227         cmd = sp->cmd;
 228
 229         /* Update entry type to indicate Command Type 3 IOCB */
 230         *((uint32_t *)(&cmd_pkt->entry_type)) =
 231             __constant_cpu_to_le32(COMMAND_A64_TYPE);
 232
 233         /* No data transfer */
 234         if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
 235                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 236                 return;
 237         }
 238
 239         ha = sp->ha;
 240
 241         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
 242
 243         /* Two DSDs are available in the Command Type 3 IOCB */
 244         avail_dsds = 2;
 245         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 246
 247         /* Load data segments */
 248         if (cmd->use_sg != 0) {
 249                 struct  scatterlist *cur_seg;
 250                 struct  scatterlist *end_seg;
 251
 252                 cur_seg = (struct scatterlist *)cmd->request_buffer;
 253                 end_seg = cur_seg + tot_dsds;
 254                 while (cur_seg < end_seg) {
 255                         dma_addr_t      sle_dma;
 256                         cont_a64_entry_t *cont_pkt;
 257
 258                         /* Allocate additional continuation packets? */
 259                         if (avail_dsds == 0) {
 260                                 /*
 261                                  * Five DSDs are available in the Continuation
 262                                  * Type 1 IOCB.
 263                                  */
 264                                 cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
 265                                 cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 266                                 avail_dsds = 5;
 267                         }
 268
 269                         sle_dma = sg_dma_address(cur_seg);
 270                         *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 271                         *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 272                         *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
 273                         avail_dsds--;
 274
 275                         cur_seg++;
 276                 }
 277         } else {
 278                 *cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
 279                 *cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
 280                 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
 281         }
 282 }
 283
 284 /**
 285  * qla2x00_start_scsi() - Send a SCSI command to the ISP
 286  * @sp: command to send to the ISP
 287  *
 288  * Returns non-zero if a failure occured, else zero.
 289  */
 290 int
 291 qla2x00_start_scsi(srb_t *sp)
 292 {
 293         int             ret;
 294         unsigned long   flags;
 295         scsi_qla_host_t *ha;
 296         struct scsi_cmnd *cmd;
 297         uint32_t        *clr_ptr;
 298         uint32_t        index;
 299         uint32_t        handle;
 300         cmd_entry_t     *cmd_pkt;
 301         struct scatterlist *sg;
 302         uint16_t        cnt;
 303         uint16_t        req_cnt;
 304         uint16_t        tot_dsds;
 305         struct device_reg_2xxx __iomem *reg;
 306
 307         /* Setup device pointers. */
 308         ret = 0;
 309         ha = sp->ha;
 310         reg = &ha->iobase->isp;
 311         cmd = sp->cmd;
 312         /* So we know we haven't pci_map'ed anything yet */
 313         tot_dsds = 0;
 314
 315         /* Send marker if required */
 316         if (ha->marker_needed != 0) {
 317                 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
 318                         return (QLA_FUNCTION_FAILED);
 319                 }
 320                 ha->marker_needed = 0;
 321         }
 322
 323         /* Acquire ring specific lock */
 324         spin_lock_irqsave(&ha->hardware_lock, flags);
 325
 326         /* Check for room in outstanding command list. */
 327         handle = ha->current_outstanding_cmd;
 328         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 329                 handle++;
 330                 if (handle == MAX_OUTSTANDING_COMMANDS)
 331                         handle = 1;
 332                 if (ha->outstanding_cmds[handle] == 0)
 333                         break;
 334         }
 335         if (index == MAX_OUTSTANDING_COMMANDS)
 336                 goto queuing_error;
 337
 338         /* Map the sg table so we have an accurate count of sg entries needed */
 339         if (cmd->use_sg) {
 340                 sg = (struct scatterlist *) cmd->request_buffer;
 341                 tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
 342                     cmd->sc_data_direction);
 343                 if (tot_dsds == 0)
 344                         goto queuing_error;
 345         } else if (cmd->request_bufflen) {
 346                 dma_addr_t      req_dma;
 347
 348                 req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
 349                     cmd->request_bufflen, cmd->sc_data_direction);
 350                 if (dma_mapping_error(req_dma))
 351                         goto queuing_error;
 352
 353                 sp->dma_handle = req_dma;
 354                 tot_dsds = 1;
 355         }
 356
 357         /* Calculate the number of request entries needed. */
 358         req_cnt = ha->isp_ops.calc_req_entries(tot_dsds);
 359         if (ha->req_q_cnt < (req_cnt + 2)) {
 360                 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
 361                 if (ha->req_ring_index < cnt)
 362                         ha->req_q_cnt = cnt - ha->req_ring_index;
 363                 else
 364                         ha->req_q_cnt = ha->request_q_length -
 365                             (ha->req_ring_index - cnt);
 366         }
 367         if (ha->req_q_cnt < (req_cnt + 2))
 368                 goto queuing_error;
 369
 370         /* Build command packet */
 371         ha->current_outstanding_cmd = handle;
 372         ha->outstanding_cmds[handle] = sp;
 373         sp->ha = ha;
 374         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 375         ha->req_q_cnt -= req_cnt;
 376
 377         cmd_pkt = (cmd_entry_t *)ha->request_ring_ptr;
 378         cmd_pkt->handle = handle;
 379         /* Zero out remaining portion of packet. */
 380         clr_ptr = (uint32_t *)cmd_pkt + 2;
 381         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 382         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 383
 384         /* Set target ID and LUN number*/
 385         SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
 386         cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
 387
 388         /* Update tagged queuing modifier */
 389         cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
 390
 391         /* Load SCSI command packet. */
 392         memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
 393         cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
 394
 395         /* Build IOCB segments */
 396         ha->isp_ops.build_iocbs(sp, cmd_pkt, tot_dsds);
 397
 398         /* Set total data segment count. */
 399         cmd_pkt->entry_count = (uint8_t)req_cnt;
 400         wmb();
 401
 402         /* Adjust ring index. */
 403         ha->req_ring_index++;
 404         if (ha->req_ring_index == ha->request_q_length) {
 405                 ha->req_ring_index = 0;
 406                 ha->request_ring_ptr = ha->request_ring;
 407         } else
 408                 ha->request_ring_ptr++;
 409
 410         sp->flags |= SRB_DMA_VALID;
 411         sp->state = SRB_ACTIVE_STATE;
 412
 413         /* Set chip new ring index. */
 414         WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
 415         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));     /* PCI Posting. */
 416
 417         /* Manage unprocessed RIO/ZIO commands in response queue. */
 418         if (ha->flags.process_response_queue &&
 419             ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
 420                 qla2x00_process_response_queue(ha);
 421
 422         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 423         return (QLA_SUCCESS);
 424
 425 queuing_error:
 426         if (cmd->use_sg && tot_dsds) {
 427                 sg = (struct scatterlist *) cmd->request_buffer;
 428                 pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
 429                     cmd->sc_data_direction);
 430         } else if (tot_dsds) {
 431                 pci_unmap_single(ha->pdev, sp->dma_handle,
 432                     cmd->request_bufflen, cmd->sc_data_direction);
 433         }
 434         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 435
 436         return (QLA_FUNCTION_FAILED);
 437 }
 438
 439 /**
 440  * qla2x00_marker() - Send a marker IOCB to the firmware.
 441  * @ha: HA context
 442  * @loop_id: loop ID
 443  * @lun: LUN
 444  * @type: marker modifier
 445  *
 446  * Can be called from both normal and interrupt context.
 447  *
 448  * Returns non-zero if a failure occured, else zero.
 449  */
 450 int
 451 __qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
 452     uint8_t type)
 453 {
 454         mrk_entry_t *mrk;
 455         struct mrk_entry_24xx *mrk24;
 456
 457         mrk24 = NULL;
 458         mrk = (mrk_entry_t *)qla2x00_req_pkt(ha);
 459         if (mrk == NULL) {
 460                 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
 461                     __func__, ha->host_no));
 462
 463                 return (QLA_FUNCTION_FAILED);
 464         }
 465
 466         mrk->entry_type = MARKER_TYPE;
 467         mrk->modifier = type;
 468         if (type != MK_SYNC_ALL) {
 469                 if (IS_QLA24XX(ha) || IS_QLA54XX(ha)) {
 470                         mrk24 = (struct mrk_entry_24xx *) mrk;
 471                         mrk24->nport_handle = cpu_to_le16(loop_id);
 472                         mrk24->lun[1] = LSB(lun);
 473                         mrk24->lun[2] = MSB(lun);
 474                 } else {
 475                         SET_TARGET_ID(ha, mrk->target, loop_id);
 476                         mrk->lun = cpu_to_le16(lun);
 477                 }
 478         }
 479         wmb();
 480
 481         qla2x00_isp_cmd(ha);
 482
 483         return (QLA_SUCCESS);
 484 }
 485
 486 int
 487 qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
 488     uint8_t type)
 489 {
 490         int ret;
 491         unsigned long flags = 0;
 492
 493         spin_lock_irqsave(&ha->hardware_lock, flags);
 494         ret = __qla2x00_marker(ha, loop_id, lun, type);
 495         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 496
 497         return (ret);
 498 }
 499
 500 /**
 501  * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
 502  * @ha: HA context
 503  *
 504  * Note: The caller must hold the hardware lock before calling this routine.
 505  *
 506  * Returns NULL if function failed, else, a pointer to the request packet.
 507  */
 508 static request_t *
 509 qla2x00_req_pkt(scsi_qla_host_t *ha)
 510 {
 511         device_reg_t __iomem *reg = ha->iobase;
 512         request_t       *pkt = NULL;
 513         uint16_t        cnt;
 514         uint32_t        *dword_ptr;
 515         uint32_t        timer;
 516         uint16_t        req_cnt = 1;
 517
 518         /* Wait 1 second for slot. */
 519         for (timer = HZ; timer; timer--) {
 520                 if ((req_cnt + 2) >= ha->req_q_cnt) {
 521                         /* Calculate number of free request entries. */
 522                         if (IS_QLA24XX(ha) || IS_QLA54XX(ha))
 523                                 cnt = (uint16_t)RD_REG_DWORD(
 524                                     &reg->isp24.req_q_out);
 525                         else
 526                                 cnt = qla2x00_debounce_register(
 527                                     ISP_REQ_Q_OUT(ha, &reg->isp));
 528                         if  (ha->req_ring_index < cnt)
 529                                 ha->req_q_cnt = cnt - ha->req_ring_index;
 530                         else
 531                                 ha->req_q_cnt = ha->request_q_length -
 532                                     (ha->req_ring_index - cnt);
 533                 }
 534                 /* If room for request in request ring. */
 535                 if ((req_cnt + 2) < ha->req_q_cnt) {
 536                         ha->req_q_cnt--;
 537                         pkt = ha->request_ring_ptr;
 538
 539                         /* Zero out packet. */
 540                         dword_ptr = (uint32_t *)pkt;
 541                         for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
 542                                 *dword_ptr++ = 0;
 543
 544                         /* Set system defined field. */
 545                         pkt->sys_define = (uint8_t)ha->req_ring_index;
 546
 547                         /* Set entry count. */
 548                         pkt->entry_count = 1;
 549
 550                         break;
 551                 }
 552
 553                 /* Release ring specific lock */
 554                 spin_unlock(&ha->hardware_lock);
 555
 556                 udelay(2);   /* 2 us */
 557
 558                 /* Check for pending interrupts. */
 559                 /* During init we issue marker directly */
 560                 if (!ha->marker_needed)
 561                         qla2x00_poll(ha);
 562
 563                 spin_lock_irq(&ha->hardware_lock);
 564         }
 565         if (!pkt) {
 566                 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
 567         }
 568
 569         return (pkt);
 570 }
 571
 572 /**
 573  * qla2x00_isp_cmd() - Modify the request ring pointer.
 574  * @ha: HA context
 575  *
 576  * Note: The caller must hold the hardware lock before calling this routine.
 577  */
 578 void
 579 qla2x00_isp_cmd(scsi_qla_host_t *ha)
 580 {
 581         device_reg_t __iomem *reg = ha->iobase;
 582
 583         DEBUG5(printk("%s(): IOCB data:\n", __func__));
 584         DEBUG5(qla2x00_dump_buffer(
 585             (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE));
 586
 587         /* Adjust ring index. */
 588         ha->req_ring_index++;
 589         if (ha->req_ring_index == ha->request_q_length) {
 590                 ha->req_ring_index = 0;
 591                 ha->request_ring_ptr = ha->request_ring;
 592         } else
 593                 ha->request_ring_ptr++;
 594
 595         /* Set chip new ring index. */
 596         if (IS_QLA24XX(ha) || IS_QLA54XX(ha)) {
 597                 WRT_REG_DWORD(&reg->isp24.req_q_in, ha->req_ring_index);
 598                 RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
 599         } else {
 600                 WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp), ha->req_ring_index);
 601                 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
 602         }
 603
 604 }
 605
 606 /**
 607  * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
 608  * Continuation Type 1 IOCBs to allocate.
 609  *
 610  * @dsds: number of data segment decriptors needed
 611  *
 612  * Returns the number of IOCB entries needed to store @dsds.
 613  */
 614 static inline uint16_t
 615 qla24xx_calc_iocbs(uint16_t dsds)
 616 {
 617         uint16_t iocbs;
 618
 619         iocbs = 1;
 620         if (dsds > 1) {
 621                 iocbs += (dsds - 1) / 5;
 622                 if ((dsds - 1) % 5)
 623                         iocbs++;
 624         }
 625         return iocbs;
 626 }
 627
 628 /**
 629  * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
 630  * IOCB types.
 631  *
 632  * @sp: SRB command to process
 633  * @cmd_pkt: Command type 3 IOCB
 634  * @tot_dsds: Total number of segments to transfer
 635  */
 636 static inline void
 637 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 638     uint16_t tot_dsds)
 639 {
 640         uint16_t        avail_dsds;
 641         uint32_t        *cur_dsd;
 642         scsi_qla_host_t *ha;
 643         struct scsi_cmnd *cmd;
 644
 645         cmd = sp->cmd;
 646
 647         /* Update entry type to indicate Command Type 3 IOCB */
 648         *((uint32_t *)(&cmd_pkt->entry_type)) =
 649             __constant_cpu_to_le32(COMMAND_TYPE_7);
 650
 651         /* No data transfer */
 652         if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
 653                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 654                 return;
 655         }
 656
 657         ha = sp->ha;
 658
 659         /* Set transfer direction */
 660         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 661                 cmd_pkt->task_mgmt_flags =
 662                     __constant_cpu_to_le16(TMF_WRITE_DATA);
 663         else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 664                 cmd_pkt->task_mgmt_flags =
 665                     __constant_cpu_to_le16(TMF_READ_DATA);
 666
 667         /* One DSD is available in the Command Type 3 IOCB */
 668         avail_dsds = 1;
 669         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 670
 671         /* Load data segments */
 672         if (cmd->use_sg != 0) {
 673                 struct  scatterlist *cur_seg;
 674                 struct  scatterlist *end_seg;
 675
 676                 cur_seg = (struct scatterlist *)cmd->request_buffer;
 677                 end_seg = cur_seg + tot_dsds;
 678                 while (cur_seg < end_seg) {
 679                         dma_addr_t      sle_dma;
 680                         cont_a64_entry_t *cont_pkt;
 681
 682                         /* Allocate additional continuation packets? */
 683                         if (avail_dsds == 0) {
 684                                 /*
 685                                  * Five DSDs are available in the Continuation
 686                                  * Type 1 IOCB.
 687                                  */
 688                                 cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
 689                                 cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 690                                 avail_dsds = 5;
 691                         }
 692
 693                         sle_dma = sg_dma_address(cur_seg);
 694                         *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 695                         *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 696                         *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
 697                         avail_dsds--;
 698
 699                         cur_seg++;
 700                 }
 701         } else {
 702                 *cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
 703                 *cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
 704                 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
 705         }
 706 }
 707
 708
 709 /**
 710  * qla24xx_start_scsi() - Send a SCSI command to the ISP
 711  * @sp: command to send to the ISP
 712  *
 713  * Returns non-zero if a failure occured, else zero.
 714  */
 715 int
 716 qla24xx_start_scsi(srb_t *sp)
 717 {
 718         int             ret;
 719         unsigned long   flags;
 720         scsi_qla_host_t *ha;
 721         struct scsi_cmnd *cmd;
 722         uint32_t        *clr_ptr;
 723         uint32_t        index;
 724         uint32_t        handle;
 725         struct cmd_type_7 *cmd_pkt;
 726         struct scatterlist *sg;
 727         uint16_t        cnt;
 728         uint16_t        req_cnt;
 729         uint16_t        tot_dsds;
 730         struct device_reg_24xx __iomem *reg;
 731
 732         /* Setup device pointers. */
 733         ret = 0;
 734         ha = sp->ha;
 735         reg = &ha->iobase->isp24;
 736         cmd = sp->cmd;
 737         /* So we know we haven't pci_map'ed anything yet */
 738         tot_dsds = 0;
 739
 740         /* Send marker if required */
 741         if (ha->marker_needed != 0) {
 742                 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
 743                         return QLA_FUNCTION_FAILED;
 744                 }
 745                 ha->marker_needed = 0;
 746         }
 747
 748         /* Acquire ring specific lock */
 749         spin_lock_irqsave(&ha->hardware_lock, flags);
 750
 751         /* Check for room in outstanding command list. */
 752         handle = ha->current_outstanding_cmd;
 753         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 754                 handle++;
 755                 if (handle == MAX_OUTSTANDING_COMMANDS)
 756                         handle = 1;
 757                 if (ha->outstanding_cmds[handle] == 0)
 758                         break;
 759         }
 760         if (index == MAX_OUTSTANDING_COMMANDS)
 761                 goto queuing_error;
 762
 763         /* Map the sg table so we have an accurate count of sg entries needed */
 764         if (cmd->use_sg) {
 765                 sg = (struct scatterlist *) cmd->request_buffer;
 766                 tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
 767                     cmd->sc_data_direction);
 768                 if (tot_dsds == 0)
 769                         goto queuing_error;
 770         } else if (cmd->request_bufflen) {
 771                 dma_addr_t      req_dma;
 772
 773                 req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
 774                     cmd->request_bufflen, cmd->sc_data_direction);
 775                 if (dma_mapping_error(req_dma))
 776                         goto queuing_error;
 777
 778                 sp->dma_handle = req_dma;
 779                 tot_dsds = 1;
 780         }
 781
 782         req_cnt = qla24xx_calc_iocbs(tot_dsds);
 783         if (ha->req_q_cnt < (req_cnt + 2)) {
 784                 cnt = (uint16_t)RD_REG_DWORD_RELAXED(&reg->req_q_out);
 785                 if (ha->req_ring_index < cnt)
 786                         ha->req_q_cnt = cnt - ha->req_ring_index;
 787                 else
 788                         ha->req_q_cnt = ha->request_q_length -
 789                                 (ha->req_ring_index - cnt);
 790         }
 791         if (ha->req_q_cnt < (req_cnt + 2))
 792                 goto queuing_error;
 793
 794         /* Build command packet. */
 795         ha->current_outstanding_cmd = handle;
 796         ha->outstanding_cmds[handle] = sp;
 797         sp->ha = ha;
 798         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 799         ha->req_q_cnt -= req_cnt;
 800
 801         cmd_pkt = (struct cmd_type_7 *)ha->request_ring_ptr;
 802         cmd_pkt->handle = handle;
 803
 804         /* Zero out remaining portion of packet. */
 805         /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
 806         clr_ptr = (uint32_t *)cmd_pkt + 2;
 807         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 808         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 809
 810         /* Set NPORT-ID and LUN number*/
 811         cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
 812         cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
 813         cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
 814         cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
 815
 816         int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
 817         host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
 818
 819         /* Load SCSI command packet. */
 820         memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
 821         host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
 822
 823         cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
 824
 825         /* Build IOCB segments */
 826         qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
 827
 828         /* Set total data segment count. */
 829         cmd_pkt->entry_count = (uint8_t)req_cnt;
 830         wmb();
 831
 832         /* Adjust ring index. */
 833         ha->req_ring_index++;
 834         if (ha->req_ring_index == ha->request_q_length) {
 835                 ha->req_ring_index = 0;
 836                 ha->request_ring_ptr = ha->request_ring;
 837         } else
 838                 ha->request_ring_ptr++;
 839
 840         sp->flags |= SRB_DMA_VALID;
 841         sp->state = SRB_ACTIVE_STATE;
 842
 843         /* Set chip new ring index. */
 844         WRT_REG_DWORD(&reg->req_q_in, ha->req_ring_index);
 845         RD_REG_DWORD_RELAXED(&reg->req_q_in);           /* PCI Posting. */
 846
 847         /* Manage unprocessed RIO/ZIO commands in response queue. */
 848         if (ha->flags.process_response_queue &&
 849             ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
 850                 qla24xx_process_response_queue(ha);
 851
 852         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 853         return QLA_SUCCESS;
 854
 855 queuing_error:
 856         if (cmd->use_sg && tot_dsds) {
 857                 sg = (struct scatterlist *) cmd->request_buffer;
 858                 pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
 859                     cmd->sc_data_direction);
 860         } else if (tot_dsds) {
 861                 pci_unmap_single(ha->pdev, sp->dma_handle,
 862                     cmd->request_bufflen, cmd->sc_data_direction);
 863         }
 864         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 865
 866         return QLA_FUNCTION_FAILED;
 867 }