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                         mrk24->handle = MAKE_HANDLE(req->id, mrk24->handle);
 457                 } else {
 458                         SET_TARGET_ID(ha, mrk->target, loop_id);
 459                         mrk->lun = cpu_to_le16(lun);
 460                 }
 461         }
 462         wmb();
 463
 464         qla2x00_isp_cmd(vha, req);
 465
 466         return (QLA_SUCCESS);
 467 }
 468
 469 int
 470 qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
 471                 struct rsp_que *rsp, uint16_t loop_id, uint16_t lun,
 472                 uint8_t type)
 473 {
 474         int ret;
 475         unsigned long flags = 0;
 476
 477         spin_lock_irqsave(&vha->hw->hardware_lock, flags);
 478         ret = __qla2x00_marker(vha, req, rsp, loop_id, lun, type);
 479         spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
 480
 481         return (ret);
 482 }
 483
 484 /**
 485  * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
 486  * @ha: HA context
 487  *
 488  * Note: The caller must hold the hardware lock before calling this routine.
 489  *
 490  * Returns NULL if function failed, else, a pointer to the request packet.
 491  */
 492 static request_t *
 493 qla2x00_req_pkt(struct scsi_qla_host *vha, struct req_que *req,
 494                 struct rsp_que *rsp)
 495 {
 496         struct qla_hw_data *ha = vha->hw;
 497         device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);
 498         request_t       *pkt = NULL;
 499         uint16_t        cnt;
 500         uint32_t        *dword_ptr;
 501         uint32_t        timer;
 502         uint16_t        req_cnt = 1;
 503
 504         /* Wait 1 second for slot. */
 505         for (timer = HZ; timer; timer--) {
 506                 if ((req_cnt + 2) >= req->cnt) {
 507                         /* Calculate number of free request entries. */
 508                         if (ha->mqenable)
 509                                 cnt = (uint16_t)
 510                                         RD_REG_DWORD(&reg->isp25mq.req_q_out);
 511                         else {
 512                                 if (IS_FWI2_CAPABLE(ha))
 513                                         cnt = (uint16_t)RD_REG_DWORD(
 514                                                 &reg->isp24.req_q_out);
 515                                 else
 516                                         cnt = qla2x00_debounce_register(
 517                                                 ISP_REQ_Q_OUT(ha, &reg->isp));
 518                         }
 519                         if  (req->ring_index < cnt)
 520                                 req->cnt = cnt - req->ring_index;
 521                         else
 522                                 req->cnt = req->length -
 523                                     (req->ring_index - cnt);
 524                 }
 525                 /* If room for request in request ring. */
 526                 if ((req_cnt + 2) < req->cnt) {
 527                         req->cnt--;
 528                         pkt = req->ring_ptr;
 529
 530                         /* Zero out packet. */
 531                         dword_ptr = (uint32_t *)pkt;
 532                         for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
 533                                 *dword_ptr++ = 0;
 534
 535                         /* Set entry count. */
 536                         pkt->entry_count = 1;
 537
 538                         break;
 539                 }
 540
 541                 /* Release ring specific lock */
 542                 spin_unlock_irq(&ha->hardware_lock);
 543
 544                 udelay(2);   /* 2 us */
 545
 546                 /* Check for pending interrupts. */
 547                 /* During init we issue marker directly */
 548                 if (!vha->marker_needed && !vha->flags.init_done)
 549                         qla2x00_poll(rsp);
 550                 spin_lock_irq(&ha->hardware_lock);
 551         }
 552         if (!pkt) {
 553                 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
 554         }
 555
 556         return (pkt);
 557 }
 558
 559 /**
 560  * qla2x00_isp_cmd() - Modify the request ring pointer.
 561  * @ha: HA context
 562  *
 563  * Note: The caller must hold the hardware lock before calling this routine.
 564  */
 565 static void
 566 qla2x00_isp_cmd(struct scsi_qla_host *vha, struct req_que *req)
 567 {
 568         struct qla_hw_data *ha = vha->hw;
 569         device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);
 570         struct device_reg_2xxx __iomem *ioreg = &ha->iobase->isp;
 571
 572         DEBUG5(printk("%s(): IOCB data:\n", __func__));
 573         DEBUG5(qla2x00_dump_buffer(
 574             (uint8_t *)req->ring_ptr, REQUEST_ENTRY_SIZE));
 575
 576         /* Adjust ring index. */
 577         req->ring_index++;
 578         if (req->ring_index == req->length) {
 579                 req->ring_index = 0;
 580                 req->ring_ptr = req->ring;
 581         } else
 582                 req->ring_ptr++;
 583
 584         /* Set chip new ring index. */
 585         if (ha->mqenable) {
 586                 WRT_REG_DWORD(&reg->isp25mq.req_q_in, req->ring_index);
 587                 RD_REG_DWORD(&ioreg->hccr);
 588         }
 589         else {
 590                 if (IS_FWI2_CAPABLE(ha)) {
 591                         WRT_REG_DWORD(&reg->isp24.req_q_in, req->ring_index);
 592                         RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
 593                 } else {
 594                         WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp),
 595                                 req->ring_index);
 596                         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
 597                 }
 598         }
 599
 600 }
 601
 602 /**
 603  * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
 604  * Continuation Type 1 IOCBs to allocate.
 605  *
 606  * @dsds: number of data segment decriptors needed
 607  *
 608  * Returns the number of IOCB entries needed to store @dsds.
 609  */
 610 static inline uint16_t
 611 qla24xx_calc_iocbs(uint16_t dsds)
 612 {
 613         uint16_t iocbs;
 614
 615         iocbs = 1;
 616         if (dsds > 1) {
 617                 iocbs += (dsds - 1) / 5;
 618                 if ((dsds - 1) % 5)
 619                         iocbs++;
 620         }
 621         return iocbs;
 622 }
 623
 624 /**
 625  * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
 626  * IOCB types.
 627  *
 628  * @sp: SRB command to process
 629  * @cmd_pkt: Command type 3 IOCB
 630  * @tot_dsds: Total number of segments to transfer
 631  */
 632 static inline void
 633 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 634     uint16_t tot_dsds)
 635 {
 636         uint16_t        avail_dsds;
 637         uint32_t        *cur_dsd;
 638         scsi_qla_host_t *vha;
 639         struct scsi_cmnd *cmd;
 640         struct scatterlist *sg;
 641         int i;
 642         struct req_que *req;
 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 (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 652                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 653                 return;
 654         }
 655
 656         vha = sp->fcport->vha;
 657         req = sp->que;
 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                 sp->fcport->vha->hw->qla_stats.output_bytes +=
 664                     scsi_bufflen(sp->cmd);
 665         } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
 666                 cmd_pkt->task_mgmt_flags =
 667                     __constant_cpu_to_le16(TMF_READ_DATA);
 668                 sp->fcport->vha->hw->qla_stats.input_bytes +=
 669                     scsi_bufflen(sp->cmd);
 670         }
 671
 672         /* One DSD is available in the Command Type 3 IOCB */
 673         avail_dsds = 1;
 674         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 675
 676         /* Load data segments */
 677
 678         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 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(req, vha);
 689                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 690                         avail_dsds = 5;
 691                 }
 692
 693                 sle_dma = sg_dma_address(sg);
 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(sg));
 697                 avail_dsds--;
 698         }
 699 }
 700
 701
 702 /**
 703  * qla24xx_start_scsi() - Send a SCSI command to the ISP
 704  * @sp: command to send to the ISP
 705  *
 706  * Returns non-zero if a failure occurred, else zero.
 707  */
 708 int
 709 qla24xx_start_scsi(srb_t *sp)
 710 {
 711         int             ret, nseg;
 712         unsigned long   flags;
 713         uint32_t        *clr_ptr;
 714         uint32_t        index;
 715         uint32_t        handle;
 716         struct cmd_type_7 *cmd_pkt;
 717         uint16_t        cnt;
 718         uint16_t        req_cnt;
 719         uint16_t        tot_dsds;
 720         struct req_que *req = NULL;
 721         struct rsp_que *rsp = NULL;
 722         struct scsi_cmnd *cmd = sp->cmd;
 723         struct scsi_qla_host *vha = sp->fcport->vha;
 724         struct qla_hw_data *ha = vha->hw;
 725
 726         /* Setup device pointers. */
 727         ret = 0;
 728
 729         req = vha->req;
 730         rsp = ha->rsp_q_map[0];
 731         sp->que = req;
 732
 733         /* So we know we haven't pci_map'ed anything yet */
 734         tot_dsds = 0;
 735
 736         /* Send marker if required */
 737         if (vha->marker_needed != 0) {
 738                 if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL)
 739                                                         != QLA_SUCCESS)
 740                         return QLA_FUNCTION_FAILED;
 741                 vha->marker_needed = 0;
 742         }
 743
 744         /* Acquire ring specific lock */
 745         spin_lock_irqsave(&ha->hardware_lock, flags);
 746
 747         /* Check for room in outstanding command list. */
 748         handle = req->current_outstanding_cmd;
 749         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 750                 handle++;
 751                 if (handle == MAX_OUTSTANDING_COMMANDS)
 752                         handle = 1;
 753                 if (!req->outstanding_cmds[handle])
 754                         break;
 755         }
 756         if (index == MAX_OUTSTANDING_COMMANDS)
 757                 goto queuing_error;
 758
 759         /* Map the sg table so we have an accurate count of sg entries needed */
 760         if (scsi_sg_count(cmd)) {
 761                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
 762                     scsi_sg_count(cmd), cmd->sc_data_direction);
 763                 if (unlikely(!nseg))
 764                         goto queuing_error;
 765         } else
 766                 nseg = 0;
 767
 768         tot_dsds = nseg;
 769
 770         req_cnt = qla24xx_calc_iocbs(tot_dsds);
 771         if (req->cnt < (req_cnt + 2)) {
 772                 cnt = RD_REG_DWORD_RELAXED(req->req_q_out);
 773
 774                 if (req->ring_index < cnt)
 775                         req->cnt = cnt - req->ring_index;
 776                 else
 777                         req->cnt = req->length -
 778                                 (req->ring_index - cnt);
 779         }
 780         if (req->cnt < (req_cnt + 2))
 781                 goto queuing_error;
 782
 783         /* Build command packet. */
 784         req->current_outstanding_cmd = handle;
 785         req->outstanding_cmds[handle] = sp;
 786         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 787         req->cnt -= req_cnt;
 788
 789         cmd_pkt = (struct cmd_type_7 *)req->ring_ptr;
 790         cmd_pkt->handle = MAKE_HANDLE(req->id, handle);
 791
 792         /* Zero out remaining portion of packet. */
 793         /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
 794         clr_ptr = (uint32_t *)cmd_pkt + 2;
 795         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 796         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 797
 798         /* Set NPORT-ID and LUN number*/
 799         cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
 800         cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
 801         cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
 802         cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
 803         cmd_pkt->vp_index = sp->fcport->vp_idx;
 804
 805         int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
 806         host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
 807
 808         /* Load SCSI command packet. */
 809         memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
 810         host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
 811
 812         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 813
 814         /* Build IOCB segments */
 815         qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
 816
 817         /* Set total data segment count. */
 818         cmd_pkt->entry_count = (uint8_t)req_cnt;
 819         /* Specify response queue number where completion should happen */
 820         cmd_pkt->entry_status = (uint8_t) rsp->id;
 821         wmb();
 822
 823         /* Adjust ring index. */
 824         req->ring_index++;
 825         if (req->ring_index == req->length) {
 826                 req->ring_index = 0;
 827                 req->ring_ptr = req->ring;
 828         } else
 829                 req->ring_ptr++;
 830
 831         sp->flags |= SRB_DMA_VALID;
 832
 833         /* Set chip new ring index. */
 834         WRT_REG_DWORD(req->req_q_in, req->ring_index);
 835         RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
 836
 837         /* Manage unprocessed RIO/ZIO commands in response queue. */
 838         if (vha->flags.process_response_queue &&
 839                 rsp->ring_ptr->signature != RESPONSE_PROCESSED)
 840                 qla24xx_process_response_queue(vha, rsp);
 841
 842         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 843         return QLA_SUCCESS;
 844
 845 queuing_error:
 846         if (tot_dsds)
 847                 scsi_dma_unmap(cmd);
 848
 849         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 850
 851         return QLA_FUNCTION_FAILED;
 852 }