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

   1 /*
   2  * QLogic Fibre Channel HBA Driver
   3  * Copyright (c)  2003-2008 QLogic Corporation
   4  *
   5  * See LICENSE.qla2xxx for copyright and licensing details.
   6  */
   7 #include "qla_def.h"
   8
   9 #include <linux/blkdev.h>
  10 #include <linux/delay.h>
  11
  12 #include <scsi/scsi_tcq.h>
  13
  14 static request_t *qla2x00_req_pkt(struct scsi_qla_host *, struct req_que *,
  15                                                         struct rsp_que *rsp);
  16 static void qla2x00_isp_cmd(struct scsi_qla_host *, struct req_que *);
  17
  18 /**
  19  * qla2x00_get_cmd_direction() - Determine control_flag data direction.
  20  * @cmd: SCSI command
  21  *
  22  * Returns the proper CF_* direction based on CDB.
  23  */
  24 static inline uint16_t
  25 qla2x00_get_cmd_direction(srb_t *sp)
  26 {
  27         uint16_t cflags;
  28
  29         cflags = 0;
  30
  31         /* Set transfer direction */
  32         if (sp->cmd->sc_data_direction == DMA_TO_DEVICE) {
  33                 cflags = CF_WRITE;
  34                 sp->fcport->vha->hw->qla_stats.output_bytes +=
  35                     scsi_bufflen(sp->cmd);
  36         } else if (sp->cmd->sc_data_direction == DMA_FROM_DEVICE) {
  37                 cflags = CF_READ;
  38                 sp->fcport->vha->hw->qla_stats.input_bytes +=
  39                     scsi_bufflen(sp->cmd);
  40         }
  41         return (cflags);
  42 }
  43
  44 /**
  45  * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
  46  * Continuation Type 0 IOCBs to allocate.
  47  *
  48  * @dsds: number of data segment decriptors needed
  49  *
  50  * Returns the number of IOCB entries needed to store @dsds.
  51  */
  52 uint16_t
  53 qla2x00_calc_iocbs_32(uint16_t dsds)
  54 {
  55         uint16_t iocbs;
  56
  57         iocbs = 1;
  58         if (dsds > 3) {
  59                 iocbs += (dsds - 3) / 7;
  60                 if ((dsds - 3) % 7)
  61                         iocbs++;
  62         }
  63         return (iocbs);
  64 }
  65
  66 /**
  67  * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
  68  * Continuation Type 1 IOCBs to allocate.
  69  *
  70  * @dsds: number of data segment decriptors needed
  71  *
  72  * Returns the number of IOCB entries needed to store @dsds.
  73  */
  74 uint16_t
  75 qla2x00_calc_iocbs_64(uint16_t dsds)
  76 {
  77         uint16_t iocbs;
  78
  79         iocbs = 1;
  80         if (dsds > 2) {
  81                 iocbs += (dsds - 2) / 5;
  82                 if ((dsds - 2) % 5)
  83                         iocbs++;
  84         }
  85         return (iocbs);
  86 }
  87
  88 /**
  89  * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
  90  * @ha: HA context
  91  *
  92  * Returns a pointer to the Continuation Type 0 IOCB packet.
  93  */
  94 static inline cont_entry_t *
  95 qla2x00_prep_cont_type0_iocb(struct req_que *req, struct scsi_qla_host *vha)
  96 {
  97         cont_entry_t *cont_pkt;
  98         /* Adjust ring index. */
  99         req->ring_index++;
 100         if (req->ring_index == req->length) {
 101                 req->ring_index = 0;
 102                 req->ring_ptr = req->ring;
 103         } else {
 104                 req->ring_ptr++;
 105         }
 106
 107         cont_pkt = (cont_entry_t *)req->ring_ptr;
 108
 109         /* Load packet defaults. */
 110         *((uint32_t *)(&cont_pkt->entry_type)) =
 111             __constant_cpu_to_le32(CONTINUE_TYPE);
 112
 113         return (cont_pkt);
 114 }
 115
 116 /**
 117  * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
 118  * @ha: HA context
 119  *
 120  * Returns a pointer to the continuation type 1 IOCB packet.
 121  */
 122 static inline cont_a64_entry_t *
 123 qla2x00_prep_cont_type1_iocb(struct req_que *req, scsi_qla_host_t *vha)
 124 {
 125         cont_a64_entry_t *cont_pkt;
 126
 127         /* Adjust ring index. */
 128         req->ring_index++;
 129         if (req->ring_index == req->length) {
 130                 req->ring_index = 0;
 131                 req->ring_ptr = req->ring;
 132         } else {
 133                 req->ring_ptr++;
 134         }
 135
 136         cont_pkt = (cont_a64_entry_t *)req->ring_ptr;
 137
 138         /* Load packet defaults. */
 139         *((uint32_t *)(&cont_pkt->entry_type)) =
 140             __constant_cpu_to_le32(CONTINUE_A64_TYPE);
 141
 142         return (cont_pkt);
 143 }
 144
 145 /**
 146  * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
 147  * capable IOCB types.
 148  *
 149  * @sp: SRB command to process
 150  * @cmd_pkt: Command type 2 IOCB
 151  * @tot_dsds: Total number of segments to transfer
 152  */
 153 void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
 154     uint16_t tot_dsds)
 155 {
 156         uint16_t        avail_dsds;
 157         uint32_t        *cur_dsd;
 158         scsi_qla_host_t *vha;
 159         struct scsi_cmnd *cmd;
 160         struct scatterlist *sg;
 161         int i;
 162         struct req_que *req;
 163
 164         cmd = sp->cmd;
 165
 166         /* Update entry type to indicate Command Type 2 IOCB */
 167         *((uint32_t *)(&cmd_pkt->entry_type)) =
 168             __constant_cpu_to_le32(COMMAND_TYPE);
 169
 170         /* No data transfer */
 171         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 172                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 173                 return;
 174         }
 175
 176         vha = sp->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->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->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->vha = vha;
 357         sp->que = req;
 358         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 359         req->cnt -= req_cnt;
 360
 361         cmd_pkt = (cmd_entry_t *)req->ring_ptr;
 362         cmd_pkt->handle = handle;
 363         /* Zero out remaining portion of packet. */
 364         clr_ptr = (uint32_t *)cmd_pkt + 2;
 365         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 366         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 367
 368         /* Set target ID and LUN number*/
 369         SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
 370         cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
 371
 372         /* Update tagged queuing modifier */
 373         cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
 374
 375         /* Load SCSI command packet. */
 376         memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
 377         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 378
 379         /* Build IOCB segments */
 380         ha->isp_ops->build_iocbs(sp, cmd_pkt, tot_dsds);
 381
 382         /* Set total data segment count. */
 383         cmd_pkt->entry_count = (uint8_t)req_cnt;
 384         wmb();
 385
 386         /* Adjust ring index. */
 387         req->ring_index++;
 388         if (req->ring_index == req->length) {
 389                 req->ring_index = 0;
 390                 req->ring_ptr = req->ring;
 391         } else
 392                 req->ring_ptr++;
 393
 394         sp->flags |= SRB_DMA_VALID;
 395
 396         /* Set chip new ring index. */
 397         WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), req->ring_index);
 398         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));     /* PCI Posting. */
 399
 400         /* Manage unprocessed RIO/ZIO commands in response queue. */
 401         if (vha->flags.process_response_queue &&
 402             rsp->ring_ptr->signature != RESPONSE_PROCESSED)
 403                 qla2x00_process_response_queue(rsp);
 404
 405         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 406         return (QLA_SUCCESS);
 407
 408 queuing_error:
 409         if (tot_dsds)
 410                 scsi_dma_unmap(cmd);
 411
 412         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 413
 414         return (QLA_FUNCTION_FAILED);
 415 }
 416
 417 /**
 418  * qla2x00_marker() - Send a marker IOCB to the firmware.
 419  * @ha: HA context
 420  * @loop_id: loop ID
 421  * @lun: LUN
 422  * @type: marker modifier
 423  *
 424  * Can be called from both normal and interrupt context.
 425  *
 426  * Returns non-zero if a failure occurred, else zero.
 427  */
 428 int
 429 __qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
 430                         struct rsp_que *rsp, uint16_t loop_id,
 431                         uint16_t lun, uint8_t type)
 432 {
 433         mrk_entry_t *mrk;
 434         struct mrk_entry_24xx *mrk24;
 435         struct qla_hw_data *ha = vha->hw;
 436         scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
 437
 438         mrk24 = NULL;
 439         mrk = (mrk_entry_t *)qla2x00_req_pkt(vha, req, rsp);
 440         if (mrk == NULL) {
 441                 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
 442                     __func__, base_vha->host_no));
 443
 444                 return (QLA_FUNCTION_FAILED);
 445         }
 446
 447         mrk->entry_type = MARKER_TYPE;
 448         mrk->modifier = type;
 449         if (type != MK_SYNC_ALL) {
 450                 if (IS_FWI2_CAPABLE(ha)) {
 451                         mrk24 = (struct mrk_entry_24xx *) mrk;
 452                         mrk24->nport_handle = cpu_to_le16(loop_id);
 453                         mrk24->lun[1] = LSB(lun);
 454                         mrk24->lun[2] = MSB(lun);
 455                         host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun));
 456                         mrk24->vp_index = vha->vp_idx;
 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 system defined field. */
 536                         pkt->sys_define = (uint8_t)req->ring_index;
 537
 538                         /* Set entry count. */
 539                         pkt->entry_count = 1;
 540
 541                         break;
 542                 }
 543
 544                 /* Release ring specific lock */
 545                 spin_unlock_irq(&ha->hardware_lock);
 546
 547                 udelay(2);   /* 2 us */
 548
 549                 /* Check for pending interrupts. */
 550                 /* During init we issue marker directly */
 551                 if (!vha->marker_needed && !vha->flags.init_done)
 552                         qla2x00_poll(rsp);
 553                 spin_lock_irq(&ha->hardware_lock);
 554         }
 555         if (!pkt) {
 556                 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
 557         }
 558
 559         return (pkt);
 560 }
 561
 562 /**
 563  * qla2x00_isp_cmd() - Modify the request ring pointer.
 564  * @ha: HA context
 565  *
 566  * Note: The caller must hold the hardware lock before calling this routine.
 567  */
 568 static void
 569 qla2x00_isp_cmd(struct scsi_qla_host *vha, struct req_que *req)
 570 {
 571         struct qla_hw_data *ha = vha->hw;
 572         device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);
 573         struct device_reg_2xxx __iomem *ioreg = &ha->iobase->isp;
 574
 575         DEBUG5(printk("%s(): IOCB data:\n", __func__));
 576         DEBUG5(qla2x00_dump_buffer(
 577             (uint8_t *)req->ring_ptr, REQUEST_ENTRY_SIZE));
 578
 579         /* Adjust ring index. */
 580         req->ring_index++;
 581         if (req->ring_index == req->length) {
 582                 req->ring_index = 0;
 583                 req->ring_ptr = req->ring;
 584         } else
 585                 req->ring_ptr++;
 586
 587         /* Set chip new ring index. */
 588         if (ha->mqenable) {
 589                 WRT_REG_DWORD(&reg->isp25mq.req_q_in, req->ring_index);
 590                 RD_REG_DWORD(&ioreg->hccr);
 591         }
 592         else {
 593                 if (IS_FWI2_CAPABLE(ha)) {
 594                         WRT_REG_DWORD(&reg->isp24.req_q_in, req->ring_index);
 595                         RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
 596                 } else {
 597                         WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp),
 598                                 req->ring_index);
 599                         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
 600                 }
 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 *vha;
 642         struct scsi_cmnd *cmd;
 643         struct scatterlist *sg;
 644         int i;
 645         struct req_que *req;
 646
 647         cmd = sp->cmd;
 648
 649         /* Update entry type to indicate Command Type 3 IOCB */
 650         *((uint32_t *)(&cmd_pkt->entry_type)) =
 651             __constant_cpu_to_le32(COMMAND_TYPE_7);
 652
 653         /* No data transfer */
 654         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 655                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 656                 return;
 657         }
 658
 659         vha = sp->vha;
 660         req = sp->que;
 661
 662         /* Set transfer direction */
 663         if (cmd->sc_data_direction == DMA_TO_DEVICE) {
 664                 cmd_pkt->task_mgmt_flags =
 665                     __constant_cpu_to_le16(TMF_WRITE_DATA);
 666                 sp->fcport->vha->hw->qla_stats.output_bytes +=
 667                     scsi_bufflen(sp->cmd);
 668         } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
 669                 cmd_pkt->task_mgmt_flags =
 670                     __constant_cpu_to_le16(TMF_READ_DATA);
 671                 sp->fcport->vha->hw->qla_stats.input_bytes +=
 672                     scsi_bufflen(sp->cmd);
 673         }
 674
 675         /* One DSD is available in the Command Type 3 IOCB */
 676         avail_dsds = 1;
 677         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 678
 679         /* Load data segments */
 680
 681         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 682                 dma_addr_t      sle_dma;
 683                 cont_a64_entry_t *cont_pkt;
 684
 685                 /* Allocate additional continuation packets? */
 686                 if (avail_dsds == 0) {
 687                         /*
 688                          * Five DSDs are available in the Continuation
 689                          * Type 1 IOCB.
 690                          */
 691                         cont_pkt = qla2x00_prep_cont_type1_iocb(req, vha);
 692                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
 693                         avail_dsds = 5;
 694                 }
 695
 696                 sle_dma = sg_dma_address(sg);
 697                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
 698                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
 699                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
 700                 avail_dsds--;
 701         }
 702 }
 703
 704
 705 /**
 706  * qla24xx_start_scsi() - Send a SCSI command to the ISP
 707  * @sp: command to send to the ISP
 708  *
 709  * Returns non-zero if a failure occurred, else zero.
 710  */
 711 int
 712 qla24xx_start_scsi(srb_t *sp)
 713 {
 714         int             ret, nseg;
 715         unsigned long   flags;
 716         uint32_t        *clr_ptr;
 717         uint32_t        index;
 718         uint32_t        handle;
 719         struct cmd_type_7 *cmd_pkt;
 720         uint16_t        cnt;
 721         uint16_t        req_cnt;
 722         uint16_t        tot_dsds;
 723         struct req_que *req = NULL;
 724         struct rsp_que *rsp = NULL;
 725         struct scsi_cmnd *cmd = sp->cmd;
 726         struct scsi_qla_host *vha = sp->vha;
 727         struct qla_hw_data *ha = vha->hw;
 728         uint16_t que_id;
 729
 730         /* Setup device pointers. */
 731         ret = 0;
 732         que_id = vha->req_ques[0];
 733
 734         req = ha->req_q_map[que_id];
 735         sp->que = req;
 736
 737         if (req->rsp)
 738                 rsp = req->rsp;
 739         else
 740                 rsp = ha->rsp_q_map[que_id];
 741         /* So we know we haven't pci_map'ed anything yet */
 742         tot_dsds = 0;
 743
 744         /* Send marker if required */
 745         if (vha->marker_needed != 0) {
 746                 if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL)
 747                                                         != QLA_SUCCESS)
 748                         return QLA_FUNCTION_FAILED;
 749                 vha->marker_needed = 0;
 750         }
 751
 752         /* Acquire ring specific lock */
 753         spin_lock_irqsave(&ha->hardware_lock, flags);
 754
 755         /* Check for room in outstanding command list. */
 756         handle = req->current_outstanding_cmd;
 757         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
 758                 handle++;
 759                 if (handle == MAX_OUTSTANDING_COMMANDS)
 760                         handle = 1;
 761                 if (!req->outstanding_cmds[handle])
 762                         break;
 763         }
 764         if (index == MAX_OUTSTANDING_COMMANDS)
 765                 goto queuing_error;
 766
 767         /* Map the sg table so we have an accurate count of sg entries needed */
 768         if (scsi_sg_count(cmd)) {
 769                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
 770                     scsi_sg_count(cmd), cmd->sc_data_direction);
 771                 if (unlikely(!nseg))
 772                         goto queuing_error;
 773         } else
 774                 nseg = 0;
 775
 776         tot_dsds = nseg;
 777
 778         req_cnt = qla24xx_calc_iocbs(tot_dsds);
 779         if (req->cnt < (req_cnt + 2)) {
 780                 cnt = ha->isp_ops->rd_req_reg(ha, req->id);
 781
 782                 if (req->ring_index < cnt)
 783                         req->cnt = cnt - req->ring_index;
 784                 else
 785                         req->cnt = req->length -
 786                                 (req->ring_index - cnt);
 787         }
 788         if (req->cnt < (req_cnt + 2))
 789                 goto queuing_error;
 790
 791         /* Build command packet. */
 792         req->current_outstanding_cmd = handle;
 793         req->outstanding_cmds[handle] = sp;
 794         sp->vha = vha;
 795         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
 796         req->cnt -= req_cnt;
 797
 798         cmd_pkt = (struct cmd_type_7 *)req->ring_ptr;
 799         cmd_pkt->handle = handle;
 800
 801         /* Zero out remaining portion of packet. */
 802         /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
 803         clr_ptr = (uint32_t *)cmd_pkt + 2;
 804         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
 805         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
 806
 807         /* Set NPORT-ID and LUN number*/
 808         cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
 809         cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
 810         cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
 811         cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
 812         cmd_pkt->vp_index = sp->fcport->vp_idx;
 813
 814         int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
 815         host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
 816
 817         /* Load SCSI command packet. */
 818         memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
 819         host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
 820
 821         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 822
 823         /* Build IOCB segments */
 824         qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
 825
 826         /* Set total data segment count. */
 827         cmd_pkt->entry_count = (uint8_t)req_cnt;
 828         wmb();
 829
 830         /* Adjust ring index. */
 831         req->ring_index++;
 832         if (req->ring_index == req->length) {
 833                 req->ring_index = 0;
 834                 req->ring_ptr = req->ring;
 835         } else
 836                 req->ring_ptr++;
 837
 838         sp->flags |= SRB_DMA_VALID;
 839
 840         /* Set chip new ring index. */
 841         ha->isp_ops->wrt_req_reg(ha, req->id, req->ring_index);
 842
 843         /* Manage unprocessed RIO/ZIO commands in response queue. */
 844         if (vha->flags.process_response_queue &&
 845                 rsp->ring_ptr->signature != RESPONSE_PROCESSED)
 846                 qla24xx_process_response_queue(rsp);
 847
 848         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 849         return QLA_SUCCESS;
 850
 851 queuing_error:
 852         if (tot_dsds)
 853                 scsi_dma_unmap(cmd);
 854
 855         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 856
 857         return QLA_FUNCTION_FAILED;
 858 }
 859
 860 uint16_t
 861 qla24xx_rd_req_reg(struct qla_hw_data *ha, uint16_t id)
 862 {
 863         device_reg_t __iomem *reg = (void *) ha->iobase;
 864         return RD_REG_DWORD_RELAXED(&reg->isp24.req_q_out);
 865 }
 866
 867 uint16_t
 868 qla25xx_rd_req_reg(struct qla_hw_data *ha, uint16_t id)
 869 {
 870         device_reg_t __iomem *reg = (void *) ha->mqiobase + QLA_QUE_PAGE * id;
 871         return RD_REG_DWORD_RELAXED(&reg->isp25mq.req_q_out);
 872 }
 873
 874 void
 875 qla24xx_wrt_req_reg(struct qla_hw_data *ha, uint16_t id, uint16_t index)
 876 {
 877         device_reg_t __iomem *reg = (void *) ha->iobase;
 878         WRT_REG_DWORD(&reg->isp24.req_q_in, index);
 879         RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
 880 }
 881
 882 void
 883 qla25xx_wrt_req_reg(struct qla_hw_data *ha, uint16_t id, uint16_t index)
 884 {
 885         device_reg_t __iomem *reg = (void *) ha->mqiobase + QLA_QUE_PAGE * id;
 886         struct device_reg_2xxx __iomem *ioreg = &ha->iobase->isp;
 887         WRT_REG_DWORD(&reg->isp25mq.req_q_in, index);
 888         RD_REG_DWORD(&ioreg->hccr); /* PCI posting */
 889 }
 890