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
 412         /* Set chip new ring index. */
 413         WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
 414         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));     /* PCI Posting. */
 415
 416         /* Manage unprocessed RIO/ZIO commands in response queue. */
 417         if (ha->flags.process_response_queue &&
 418             ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
 419                 qla2x00_process_response_queue(ha);
 420
 421         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 422         return (QLA_SUCCESS);
 423
 424 queuing_error:
 425         if (cmd->use_sg && tot_dsds) {
 426                 sg = (struct scatterlist *) cmd->request_buffer;
 427                 pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
 428                     cmd->sc_data_direction);
 429         } else if (tot_dsds) {
 430                 pci_unmap_single(ha->pdev, sp->dma_handle,
 431                     cmd->request_bufflen, cmd->sc_data_direction);
 432         }
 433         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 434
 435         return (QLA_FUNCTION_FAILED);
 436 }
 437
 438 /**
 439  * qla2x00_marker() - Send a marker IOCB to the firmware.
 440  * @ha: HA context
 441  * @loop_id: loop ID
 442  * @lun: LUN
 443  * @type: marker modifier
 444  *
 445  * Can be called from both normal and interrupt context.
 446  *
 447  * Returns non-zero if a failure occured, else zero.
 448  */
 449 int
 450 __qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
 451     uint8_t type)
 452 {
 453         mrk_entry_t *mrk;
 454         struct mrk_entry_24xx *mrk24;
 455
 456         mrk24 = NULL;
 457         mrk = (mrk_entry_t *)qla2x00_req_pkt(ha);
 458         if (mrk == NULL) {
 459                 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
 460                     __func__, ha->host_no));
 461
 462                 return (QLA_FUNCTION_FAILED);
 463         }
 464
 465         mrk->entry_type = MARKER_TYPE;
 466         mrk->modifier = type;
 467         if (type != MK_SYNC_ALL) {
 468                 if (IS_QLA24XX(ha) || IS_QLA54XX(ha)) {
 469                         mrk24 = (struct mrk_entry_24xx *) mrk;
 470                         mrk24->nport_handle = cpu_to_le16(loop_id);
 471                         mrk24->lun[1] = LSB(lun);
 472                         mrk24->lun[2] = MSB(lun);
 473                 } else {
 474                         SET_TARGET_ID(ha, mrk->target, loop_id);
 475                         mrk->lun = cpu_to_le16(lun);
 476                 }
 477         }
 478         wmb();
 479
 480         qla2x00_isp_cmd(ha);
 481
 482         return (QLA_SUCCESS);
 483 }
 484
 485 int
 486 qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
 487     uint8_t type)
 488 {
 489         int ret;
 490         unsigned long flags = 0;
 491
 492         spin_lock_irqsave(&ha->hardware_lock, flags);
 493         ret = __qla2x00_marker(ha, loop_id, lun, type);
 494         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 495
 496         return (ret);
 497 }
 498
 499 /**
 500  * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
 501  * @ha: HA context
 502  *
 503  * Note: The caller must hold the hardware lock before calling this routine.
 504  *
 505  * Returns NULL if function failed, else, a pointer to the request packet.
 506  */
 507 static request_t *
 508 qla2x00_req_pkt(scsi_qla_host_t *ha)
 509 {
 510         device_reg_t __iomem *reg = ha->iobase;
 511         request_t       *pkt = NULL;
 512         uint16_t        cnt;
 513         uint32_t        *dword_ptr;
 514         uint32_t        timer;
 515         uint16_t        req_cnt = 1;
 516
 517         /* Wait 1 second for slot. */
 518         for (timer = HZ; timer; timer--) {
 519                 if ((req_cnt + 2) >= ha->req_q_cnt) {
 520                         /* Calculate number of free request entries. */
 521                         if (IS_QLA24XX(ha) || IS_QLA54XX(ha))
 522                                 cnt = (uint16_t)RD_REG_DWORD(
 523                                     &reg->isp24.req_q_out);
 524                         else
 525                                 cnt = qla2x00_debounce_register(
 526                                     ISP_REQ_Q_OUT(ha, &reg->isp));
 527                         if  (ha->req_ring_index < cnt)
 528                                 ha->req_q_cnt = cnt - ha->req_ring_index;
 529                         else
 530                                 ha->req_q_cnt = ha->request_q_length -
 531                                     (ha->req_ring_index - cnt);
 532                 }
 533                 /* If room for request in request ring. */
 534                 if ((req_cnt + 2) < ha->req_q_cnt) {
 535                         ha->req_q_cnt--;
 536                         pkt = ha->request_ring_ptr;
 537
 538                         /* Zero out packet. */
 539                         dword_ptr = (uint32_t *)pkt;
 540                         for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
 541                                 *dword_ptr++ = 0;
 542
 543                         /* Set system defined field. */
 544                         pkt->sys_define = (uint8_t)ha->req_ring_index;
 545
 546                         /* Set entry count. */
 547                         pkt->entry_count = 1;
 548
 549                         break;
 550                 }
 551
 552                 /* Release ring specific lock */
 553                 spin_unlock(&ha->hardware_lock);
 554
 555                 udelay(2);   /* 2 us */
 556
 557                 /* Check for pending interrupts. */
 558                 /* During init we issue marker directly */
 559                 if (!ha->marker_needed)
 560                         qla2x00_poll(ha);
 561
 562                 spin_lock_irq(&ha->hardware_lock);
 563         }
 564         if (!pkt) {
 565                 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
 566         }
 567
 568         return (pkt);
 569 }
 570
 571 /**
 572  * qla2x00_isp_cmd() - Modify the request ring pointer.
 573  * @ha: HA context
 574  *
 575  * Note: The caller must hold the hardware lock before calling this routine.
 576  */
 577 void
 578 qla2x00_isp_cmd(scsi_qla_host_t *ha)
 579 {
 580         device_reg_t __iomem *reg = ha->iobase;
 581
 582         DEBUG5(printk("%s(): IOCB data:\n", __func__));
 583         DEBUG5(qla2x00_dump_buffer(
 584             (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE));
 585
 586         /* Adjust ring index. */
 587         ha->req_ring_index++;
 588         if (ha->req_ring_index == ha->request_q_length) {
 589                 ha->req_ring_index = 0;
 590                 ha->request_ring_ptr = ha->request_ring;
 591         } else
 592                 ha->request_ring_ptr++;
 593
 594         /* Set chip new ring index. */
 595         if (IS_QLA24XX(ha) || IS_QLA54XX(ha)) {
 596                 WRT_REG_DWORD(&reg->isp24.req_q_in, ha->req_ring_index);
 597                 RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
 598         } else {
 599                 WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp), ha->req_ring_index);
 600                 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
 601         }
 602
 603 }
 604
 605 /**
 606  * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
 607  * Continuation Type 1 IOCBs to allocate.
 608  *
 609  * @dsds: number of data segment decriptors needed
 610  *
 611  * Returns the number of IOCB entries needed to store @dsds.
 612  */
 613 static inline uint16_t
 614 qla24xx_calc_iocbs(uint16_t dsds)
 615 {
 616         uint16_t iocbs;
 617
 618         iocbs = 1;
 619         if (dsds > 1) {
 620                 iocbs += (dsds - 1) / 5;
 621                 if ((dsds - 1) % 5)
 622                         iocbs++;
 623         }
 624         return iocbs;
 625 }
 626
 627 /**
 628  * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
 629  * IOCB types.
 630  *
 631  * @sp: SRB command to process
 632  * @cmd_pkt: Command type 3 IOCB
 633  * @tot_dsds: Total number of segments to transfer
 634  */
 635 static inline void
 636 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 637     uint16_t tot_dsds)
 638 {
 639         uint16_t        avail_dsds;
 640         uint32_t        *cur_dsd;
 641         scsi_qla_host_t *ha;
 642         struct scsi_cmnd *cmd;
 643
 644         cmd = sp->cmd;
 645
 646         /* Update entry type to indicate Command Type 3 IOCB */
 647         *((uint32_t *)(&cmd_pkt->entry_type)) =
 648             __constant_cpu_to_le32(COMMAND_TYPE_7);
 649
 650         /* No data transfer */
 651         if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
 652                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 653                 return;
 654         }
 655
 656         ha = sp->ha;
 657
 658         /* Set transfer direction */
 659         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 660                 cmd_pkt->task_mgmt_flags =
 661                     __constant_cpu_to_le16(TMF_WRITE_DATA);
 662         else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 663                 cmd_pkt->task_mgmt_flags =
 664                     __constant_cpu_to_le16(TMF_READ_DATA);
 665
 666         /* One DSD is available in the Command Type 3 IOCB */
 667         avail_dsds = 1;
 668         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 669
 670         /* Load data segments */
 671         if (cmd->use_sg != 0) {
 672                 struct  scatterlist *cur_seg;
 673                 struct  scatterlist *end_seg;
 674
 675                 cur_seg = (struct scatterlist *)cmd->request_buffer;
 676                 end_seg = cur_seg + tot_dsds;
 677                 while (cur_seg < end_seg) {
 678                         dma_addr_t      sle_dma;
 679                         cont_a64_entry_t *cont_pkt;
 680
 681                         /* Allocate additional continuation packets? */
 682                         if (avail_dsds == 0) {
 683                                 /*
 684                                  * Five DSDs are available in the Continuation
 685                                  * Type 1 IOCB.
 686                                  */
 687                                 cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
 688                                 cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 689                                 avail_dsds = 5;
 690                         }
 691
 692                         sle_dma = sg_dma_address(cur_seg);
 693                         *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 694                         *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 695                         *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
 696                         avail_dsds--;
 697
 698                         cur_seg++;
 699                 }
 700         } else {
 701                 *cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
 702                 *cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
 703                 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
 704         }
 705 }
 706
 707
 708 /**
 709  * qla24xx_start_scsi() - Send a SCSI command to the ISP
 710  * @sp: command to send to the ISP
 711  *
 712  * Returns non-zero if a failure occured, else zero.
 713  */
 714 int
 715 qla24xx_start_scsi(srb_t *sp)
 716 {
 717         int             ret;
 718         unsigned long   flags;
 719         scsi_qla_host_t *ha;
 720         struct scsi_cmnd *cmd;
 721         uint32_t        *clr_ptr;
 722         uint32_t        index;
 723         uint32_t        handle;
 724         struct cmd_type_7 *cmd_pkt;
 725         struct scatterlist *sg;
 726         uint16_t        cnt;
 727         uint16_t        req_cnt;
 728         uint16_t        tot_dsds;
 729         struct device_reg_24xx __iomem *reg;
 730
 731         /* Setup device pointers. */
 732         ret = 0;
 733         ha = sp->ha;
 734         reg = &ha->iobase->isp24;
 735         cmd = sp->cmd;
 736         /* So we know we haven't pci_map'ed anything yet */
 737         tot_dsds = 0;
 738
 739         /* Send marker if required */
 740         if (ha->marker_needed != 0) {
 741                 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
 742                         return QLA_FUNCTION_FAILED;
 743                 }
 744                 ha->marker_needed = 0;
 745         }
 746
 747         /* Acquire ring specific lock */
 748         spin_lock_irqsave(&ha->hardware_lock, flags);
 749
 750         /* Check for room in outstanding command list. */
 751         handle = ha->current_outstanding_cmd;
 752         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 753                 handle++;
 754                 if (handle == MAX_OUTSTANDING_COMMANDS)
 755                         handle = 1;
 756                 if (ha->outstanding_cmds[handle] == 0)
 757                         break;
 758         }
 759         if (index == MAX_OUTSTANDING_COMMANDS)
 760                 goto queuing_error;
 761
 762         /* Map the sg table so we have an accurate count of sg entries needed */
 763         if (cmd->use_sg) {
 764                 sg = (struct scatterlist *) cmd->request_buffer;
 765                 tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
 766                     cmd->sc_data_direction);
 767                 if (tot_dsds == 0)
 768                         goto queuing_error;
 769         } else if (cmd->request_bufflen) {
 770                 dma_addr_t      req_dma;
 771
 772                 req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
 773                     cmd->request_bufflen, cmd->sc_data_direction);
 774                 if (dma_mapping_error(req_dma))
 775                         goto queuing_error;
 776
 777                 sp->dma_handle = req_dma;
 778                 tot_dsds = 1;
 779         }
 780
 781         req_cnt = qla24xx_calc_iocbs(tot_dsds);
 782         if (ha->req_q_cnt < (req_cnt + 2)) {
 783                 cnt = (uint16_t)RD_REG_DWORD_RELAXED(&reg->req_q_out);
 784                 if (ha->req_ring_index < cnt)
 785                         ha->req_q_cnt = cnt - ha->req_ring_index;
 786                 else
 787                         ha->req_q_cnt = ha->request_q_length -
 788                                 (ha->req_ring_index - cnt);
 789         }
 790         if (ha->req_q_cnt < (req_cnt + 2))
 791                 goto queuing_error;
 792
 793         /* Build command packet. */
 794         ha->current_outstanding_cmd = handle;
 795         ha->outstanding_cmds[handle] = sp;
 796         sp->ha = ha;
 797         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 798         ha->req_q_cnt -= req_cnt;
 799
 800         cmd_pkt = (struct cmd_type_7 *)ha->request_ring_ptr;
 801         cmd_pkt->handle = handle;
 802
 803         /* Zero out remaining portion of packet. */
 804         /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
 805         clr_ptr = (uint32_t *)cmd_pkt + 2;
 806         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 807         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 808
 809         /* Set NPORT-ID and LUN number*/
 810         cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
 811         cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
 812         cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
 813         cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
 814
 815         int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
 816         host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
 817
 818         /* Load SCSI command packet. */
 819         memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
 820         host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
 821
 822         cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
 823
 824         /* Build IOCB segments */
 825         qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
 826
 827         /* Set total data segment count. */
 828         cmd_pkt->entry_count = (uint8_t)req_cnt;
 829         wmb();
 830
 831         /* Adjust ring index. */
 832         ha->req_ring_index++;
 833         if (ha->req_ring_index == ha->request_q_length) {
 834                 ha->req_ring_index = 0;
 835                 ha->request_ring_ptr = ha->request_ring;
 836         } else
 837                 ha->request_ring_ptr++;
 838
 839         sp->flags |= SRB_DMA_VALID;
 840
 841         /* Set chip new ring index. */
 842         WRT_REG_DWORD(&reg->req_q_in, ha->req_ring_index);
 843         RD_REG_DWORD_RELAXED(&reg->req_q_in);           /* PCI Posting. */
 844
 845         /* Manage unprocessed RIO/ZIO commands in response queue. */
 846         if (ha->flags.process_response_queue &&
 847             ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
 848                 qla24xx_process_response_queue(ha);
 849
 850         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 851         return QLA_SUCCESS;
 852
 853 queuing_error:
 854         if (cmd->use_sg && tot_dsds) {
 855                 sg = (struct scatterlist *) cmd->request_buffer;
 856                 pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
 857                     cmd->sc_data_direction);
 858         } else if (tot_dsds) {
 859                 pci_unmap_single(ha->pdev, sp->dma_handle,
 860                     cmd->request_bufflen, cmd->sc_data_direction);
 861         }
 862         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 863
 864         return QLA_FUNCTION_FAILED;
 865 }