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 static void qla2x00_isp_cmd(scsi_qla_host_t *ha); 19 20 /** 21 * qla2x00_get_cmd_direction() - Determine control_flag data direction. 22 * @cmd: SCSI command 23 * 24 * Returns the proper CF_* direction based on CDB. 25 */ 26 static inline uint16_t 27 qla2x00_get_cmd_direction(struct scsi_cmnd *cmd) 28 { 29 uint16_t cflags; 30 31 cflags = 0; 32 33 /* Set transfer direction */ 34 if (cmd->sc_data_direction == DMA_TO_DEVICE) 35 cflags = CF_WRITE; 36 else if (cmd->sc_data_direction == DMA_FROM_DEVICE) 37 cflags = CF_READ; 38 return (cflags); 39 } 40 41 /** 42 * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and 43 * Continuation Type 0 IOCBs to allocate. 44 * 45 * @dsds: number of data segment decriptors needed 46 * 47 * Returns the number of IOCB entries needed to store @dsds. 48 */ 49 uint16_t 50 qla2x00_calc_iocbs_32(uint16_t dsds) 51 { 52 uint16_t iocbs; 53 54 iocbs = 1; 55 if (dsds > 3) { 56 iocbs += (dsds - 3) / 7; 57 if ((dsds - 3) % 7) 58 iocbs++; 59 } 60 return (iocbs); 61 } 62 63 /** 64 * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and 65 * Continuation Type 1 IOCBs to allocate. 66 * 67 * @dsds: number of data segment decriptors needed 68 * 69 * Returns the number of IOCB entries needed to store @dsds. 70 */ 71 uint16_t 72 qla2x00_calc_iocbs_64(uint16_t dsds) 73 { 74 uint16_t iocbs; 75 76 iocbs = 1; 77 if (dsds > 2) { 78 iocbs += (dsds - 2) / 5; 79 if ((dsds - 2) % 5) 80 iocbs++; 81 } 82 return (iocbs); 83 } 84 85 /** 86 * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB. 87 * @ha: HA context 88 * 89 * Returns a pointer to the Continuation Type 0 IOCB packet. 90 */ 91 static inline cont_entry_t * 92 qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *ha) 93 { 94 cont_entry_t *cont_pkt; 95 96 /* Adjust ring index. */ 97 ha->req_ring_index++; 98 if (ha->req_ring_index == ha->request_q_length) { 99 ha->req_ring_index = 0; 100 ha->request_ring_ptr = ha->request_ring; 101 } else { 102 ha->request_ring_ptr++; 103 } 104 105 cont_pkt = (cont_entry_t *)ha->request_ring_ptr; 106 107 /* Load packet defaults. */ 108 *((uint32_t *)(&cont_pkt->entry_type)) = 109 __constant_cpu_to_le32(CONTINUE_TYPE); 110 111 return (cont_pkt); 112 } 113 114 /** 115 * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB. 116 * @ha: HA context 117 * 118 * Returns a pointer to the continuation type 1 IOCB packet. 119 */ 120 static inline cont_a64_entry_t * 121 qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *ha) 122 { 123 cont_a64_entry_t *cont_pkt; 124 125 /* Adjust ring index. */ 126 ha->req_ring_index++; 127 if (ha->req_ring_index == ha->request_q_length) { 128 ha->req_ring_index = 0; 129 ha->request_ring_ptr = ha->request_ring; 130 } else { 131 ha->request_ring_ptr++; 132 } 133 134 cont_pkt = (cont_a64_entry_t *)ha->request_ring_ptr; 135 136 /* Load packet defaults. */ 137 *((uint32_t *)(&cont_pkt->entry_type)) = 138 __constant_cpu_to_le32(CONTINUE_A64_TYPE); 139 140 return (cont_pkt); 141 } 142 143 /** 144 * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit 145 * capable IOCB types. 146 * 147 * @sp: SRB command to process 148 * @cmd_pkt: Command type 2 IOCB 149 * @tot_dsds: Total number of segments to transfer 150 */ 151 void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt, 152 uint16_t tot_dsds) 153 { 154 uint16_t avail_dsds; 155 uint32_t *cur_dsd; 156 scsi_qla_host_t *ha; 157 struct scsi_cmnd *cmd; 158 struct scatterlist *sg; 159 int i; 160 161 cmd = sp->cmd; 162 163 /* Update entry type to indicate Command Type 2 IOCB */ 164 *((uint32_t *)(&cmd_pkt->entry_type)) = 165 __constant_cpu_to_le32(COMMAND_TYPE); 166 167 /* No data transfer */ 168 if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) { 169 cmd_pkt->byte_count = __constant_cpu_to_le32(0); 170 return; 171 } 172 173 ha = sp->ha; 174 175 cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd)); 176 177 /* Three DSDs are available in the Command Type 2 IOCB */ 178 avail_dsds = 3; 179 cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address; 180 181 /* Load data segments */ 182 scsi_for_each_sg(cmd, sg, tot_dsds, i) { 183 cont_entry_t *cont_pkt; 184 185 /* Allocate additional continuation packets? */ 186 if (avail_dsds == 0) { 187 /* 188 * Seven DSDs are available in the Continuation 189 * Type 0 IOCB. 190 */ 191 cont_pkt = qla2x00_prep_cont_type0_iocb(ha); 192 cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address; 193 avail_dsds = 7; 194 } 195 196 *cur_dsd++ = cpu_to_le32(sg_dma_address(sg)); 197 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg)); 198 avail_dsds--; 199 } 200 } 201 202 /** 203 * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit 204 * capable IOCB types. 205 * 206 * @sp: SRB command to process 207 * @cmd_pkt: Command type 3 IOCB 208 * @tot_dsds: Total number of segments to transfer 209 */ 210 void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt, 211 uint16_t tot_dsds) 212 { 213 uint16_t avail_dsds; 214 uint32_t *cur_dsd; 215 scsi_qla_host_t *ha; 216 struct scsi_cmnd *cmd; 217 struct scatterlist *sg; 218 int i; 219 220 cmd = sp->cmd; 221 222 /* Update entry type to indicate Command Type 3 IOCB */ 223 *((uint32_t *)(&cmd_pkt->entry_type)) = 224 __constant_cpu_to_le32(COMMAND_A64_TYPE); 225 226 /* No data transfer */ 227 if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) { 228 cmd_pkt->byte_count = __constant_cpu_to_le32(0); 229 return; 230 } 231 232 ha = sp->ha; 233 234 cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd)); 235 236 /* Two DSDs are available in the Command Type 3 IOCB */ 237 avail_dsds = 2; 238 cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address; 239 240 /* Load data segments */ 241 scsi_for_each_sg(cmd, sg, tot_dsds, i) { 242 dma_addr_t sle_dma; 243 cont_a64_entry_t *cont_pkt; 244 245 /* Allocate additional continuation packets? */ 246 if (avail_dsds == 0) { 247 /* 248 * Five DSDs are available in the Continuation 249 * Type 1 IOCB. 250 */ 251 cont_pkt = qla2x00_prep_cont_type1_iocb(ha); 252 cur_dsd = (uint32_t *)cont_pkt->dseg_0_address; 253 avail_dsds = 5; 254 } 255 256 sle_dma = sg_dma_address(sg); 257 *cur_dsd++ = cpu_to_le32(LSD(sle_dma)); 258 *cur_dsd++ = cpu_to_le32(MSD(sle_dma)); 259 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg)); 260 avail_dsds--; 261 } 262 } 263 264 /** 265 * qla2x00_start_scsi() - Send a SCSI command to the ISP 266 * @sp: command to send to the ISP 267 * 268 * Returns non-zero if a failure occured, else zero. 269 */ 270 int 271 qla2x00_start_scsi(srb_t *sp) 272 { 273 int ret, nseg; 274 unsigned long flags; 275 scsi_qla_host_t *ha; 276 struct scsi_cmnd *cmd; 277 uint32_t *clr_ptr; 278 uint32_t index; 279 uint32_t handle; 280 cmd_entry_t *cmd_pkt; 281 uint16_t cnt; 282 uint16_t req_cnt; 283 uint16_t tot_dsds; 284 struct device_reg_2xxx __iomem *reg; 285 286 /* Setup device pointers. */ 287 ret = 0; 288 ha = sp->ha; 289 reg = &ha->iobase->isp; 290 cmd = sp->cmd; 291 /* So we know we haven't pci_map'ed anything yet */ 292 tot_dsds = 0; 293 294 /* Send marker if required */ 295 if (ha->marker_needed != 0) { 296 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) { 297 return (QLA_FUNCTION_FAILED); 298 } 299 ha->marker_needed = 0; 300 } 301 302 /* Acquire ring specific lock */ 303 spin_lock_irqsave(&ha->hardware_lock, flags); 304 305 /* Check for room in outstanding command list. */ 306 handle = ha->current_outstanding_cmd; 307 for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) { 308 handle++; 309 if (handle == MAX_OUTSTANDING_COMMANDS) 310 handle = 1; 311 if (!ha->outstanding_cmds[handle]) 312 break; 313 } 314 if (index == MAX_OUTSTANDING_COMMANDS) 315 goto queuing_error; 316 317 /* Map the sg table so we have an accurate count of sg entries needed */ 318 if (scsi_sg_count(cmd)) { 319 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd), 320 scsi_sg_count(cmd), cmd->sc_data_direction); 321 if (unlikely(!nseg)) 322 goto queuing_error; 323 } else 324 nseg = 0; 325 326 tot_dsds = nseg; 327 328 /* Calculate the number of request entries needed. */ 329 req_cnt = ha->isp_ops->calc_req_entries(tot_dsds); 330 if (ha->req_q_cnt < (req_cnt + 2)) { 331 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg)); 332 if (ha->req_ring_index < cnt) 333 ha->req_q_cnt = cnt - ha->req_ring_index; 334 else 335 ha->req_q_cnt = ha->request_q_length - 336 (ha->req_ring_index - cnt); 337 } 338 if (ha->req_q_cnt < (req_cnt + 2)) 339 goto queuing_error; 340 341 /* Build command packet */ 342 ha->current_outstanding_cmd = handle; 343 ha->outstanding_cmds[handle] = sp; 344 sp->ha = ha; 345 sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle; 346 ha->req_q_cnt -= req_cnt; 347 348 cmd_pkt = (cmd_entry_t *)ha->request_ring_ptr; 349 cmd_pkt->handle = handle; 350 /* Zero out remaining portion of packet. */ 351 clr_ptr = (uint32_t *)cmd_pkt + 2; 352 memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8); 353 cmd_pkt->dseg_count = cpu_to_le16(tot_dsds); 354 355 /* Set target ID and LUN number*/ 356 SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id); 357 cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun); 358 359 /* Update tagged queuing modifier */ 360 cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG); 361 362 /* Load SCSI command packet. */ 363 memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len); 364 cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd)); 365 366 /* Build IOCB segments */ 367 ha->isp_ops->build_iocbs(sp, cmd_pkt, tot_dsds); 368 369 /* Set total data segment count. */ 370 cmd_pkt->entry_count = (uint8_t)req_cnt; 371 wmb(); 372 373 /* Adjust ring index. */ 374 ha->req_ring_index++; 375 if (ha->req_ring_index == ha->request_q_length) { 376 ha->req_ring_index = 0; 377 ha->request_ring_ptr = ha->request_ring; 378 } else 379 ha->request_ring_ptr++; 380 381 sp->flags |= SRB_DMA_VALID; 382 383 /* Set chip new ring index. */ 384 WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index); 385 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg)); /* PCI Posting. */ 386 387 /* Manage unprocessed RIO/ZIO commands in response queue. */ 388 if (ha->flags.process_response_queue && 389 ha->response_ring_ptr->signature != RESPONSE_PROCESSED) 390 qla2x00_process_response_queue(ha); 391 392 spin_unlock_irqrestore(&ha->hardware_lock, flags); 393 return (QLA_SUCCESS); 394 395 queuing_error: 396 if (tot_dsds) 397 scsi_dma_unmap(cmd); 398 399 spin_unlock_irqrestore(&ha->hardware_lock, flags); 400 401 return (QLA_FUNCTION_FAILED); 402 } 403 404 /** 405 * qla2x00_marker() - Send a marker IOCB to the firmware. 406 * @ha: HA context 407 * @loop_id: loop ID 408 * @lun: LUN 409 * @type: marker modifier 410 * 411 * Can be called from both normal and interrupt context. 412 * 413 * Returns non-zero if a failure occured, else zero. 414 */ 415 int 416 __qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun, 417 uint8_t type) 418 { 419 mrk_entry_t *mrk; 420 struct mrk_entry_24xx *mrk24; 421 scsi_qla_host_t *pha = to_qla_parent(ha); 422 423 mrk24 = NULL; 424 mrk = (mrk_entry_t *)qla2x00_req_pkt(pha); 425 if (mrk == NULL) { 426 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n", 427 __func__, ha->host_no)); 428 429 return (QLA_FUNCTION_FAILED); 430 } 431 432 mrk->entry_type = MARKER_TYPE; 433 mrk->modifier = type; 434 if (type != MK_SYNC_ALL) { 435 if (IS_FWI2_CAPABLE(ha)) { 436 mrk24 = (struct mrk_entry_24xx *) mrk; 437 mrk24->nport_handle = cpu_to_le16(loop_id); 438 mrk24->lun[1] = LSB(lun); 439 mrk24->lun[2] = MSB(lun); 440 host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun)); 441 mrk24->vp_index = ha->vp_idx; 442 } else { 443 SET_TARGET_ID(ha, mrk->target, loop_id); 444 mrk->lun = cpu_to_le16(lun); 445 } 446 } 447 wmb(); 448 449 qla2x00_isp_cmd(pha); 450 451 return (QLA_SUCCESS); 452 } 453 454 int 455 qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun, 456 uint8_t type) 457 { 458 int ret; 459 unsigned long flags = 0; 460 461 spin_lock_irqsave(&ha->hardware_lock, flags); 462 ret = __qla2x00_marker(ha, loop_id, lun, type); 463 spin_unlock_irqrestore(&ha->hardware_lock, flags); 464 465 return (ret); 466 } 467 468 /** 469 * qla2x00_req_pkt() - Retrieve a request packet from the request ring. 470 * @ha: HA context 471 * 472 * Note: The caller must hold the hardware lock before calling this routine. 473 * 474 * Returns NULL if function failed, else, a pointer to the request packet. 475 */ 476 static request_t * 477 qla2x00_req_pkt(scsi_qla_host_t *ha) 478 { 479 device_reg_t __iomem *reg = ha->iobase; 480 request_t *pkt = NULL; 481 uint16_t cnt; 482 uint32_t *dword_ptr; 483 uint32_t timer; 484 uint16_t req_cnt = 1; 485 486 /* Wait 1 second for slot. */ 487 for (timer = HZ; timer; timer--) { 488 if ((req_cnt + 2) >= ha->req_q_cnt) { 489 /* Calculate number of free request entries. */ 490 if (IS_FWI2_CAPABLE(ha)) 491 cnt = (uint16_t)RD_REG_DWORD( 492 ®->isp24.req_q_out); 493 else 494 cnt = qla2x00_debounce_register( 495 ISP_REQ_Q_OUT(ha, ®->isp)); 496 if (ha->req_ring_index < cnt) 497 ha->req_q_cnt = cnt - ha->req_ring_index; 498 else 499 ha->req_q_cnt = ha->request_q_length - 500 (ha->req_ring_index - cnt); 501 } 502 /* If room for request in request ring. */ 503 if ((req_cnt + 2) < ha->req_q_cnt) { 504 ha->req_q_cnt--; 505 pkt = ha->request_ring_ptr; 506 507 /* Zero out packet. */ 508 dword_ptr = (uint32_t *)pkt; 509 for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++) 510 *dword_ptr++ = 0; 511 512 /* Set system defined field. */ 513 pkt->sys_define = (uint8_t)ha->req_ring_index; 514 515 /* Set entry count. */ 516 pkt->entry_count = 1; 517 518 break; 519 } 520 521 /* Release ring specific lock */ 522 spin_unlock(&ha->hardware_lock); 523 524 udelay(2); /* 2 us */ 525 526 /* Check for pending interrupts. */ 527 /* During init we issue marker directly */ 528 if (!ha->marker_needed && !ha->flags.init_done) 529 qla2x00_poll(ha); 530 531 spin_lock_irq(&ha->hardware_lock); 532 } 533 if (!pkt) { 534 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__)); 535 } 536 537 return (pkt); 538 } 539 540 /** 541 * qla2x00_isp_cmd() - Modify the request ring pointer. 542 * @ha: HA context 543 * 544 * Note: The caller must hold the hardware lock before calling this routine. 545 */ 546 static void 547 qla2x00_isp_cmd(scsi_qla_host_t *ha) 548 { 549 device_reg_t __iomem *reg = ha->iobase; 550 551 DEBUG5(printk("%s(): IOCB data:\n", __func__)); 552 DEBUG5(qla2x00_dump_buffer( 553 (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE)); 554 555 /* Adjust ring index. */ 556 ha->req_ring_index++; 557 if (ha->req_ring_index == ha->request_q_length) { 558 ha->req_ring_index = 0; 559 ha->request_ring_ptr = ha->request_ring; 560 } else 561 ha->request_ring_ptr++; 562 563 /* Set chip new ring index. */ 564 if (IS_FWI2_CAPABLE(ha)) { 565 WRT_REG_DWORD(®->isp24.req_q_in, ha->req_ring_index); 566 RD_REG_DWORD_RELAXED(®->isp24.req_q_in); 567 } else { 568 WRT_REG_WORD(ISP_REQ_Q_IN(ha, ®->isp), ha->req_ring_index); 569 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, ®->isp)); 570 } 571 572 } 573 574 /** 575 * qla24xx_calc_iocbs() - Determine number of Command Type 3 and 576 * Continuation Type 1 IOCBs to allocate. 577 * 578 * @dsds: number of data segment decriptors needed 579 * 580 * Returns the number of IOCB entries needed to store @dsds. 581 */ 582 static inline uint16_t 583 qla24xx_calc_iocbs(uint16_t dsds) 584 { 585 uint16_t iocbs; 586 587 iocbs = 1; 588 if (dsds > 1) { 589 iocbs += (dsds - 1) / 5; 590 if ((dsds - 1) % 5) 591 iocbs++; 592 } 593 return iocbs; 594 } 595 596 /** 597 * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7 598 * IOCB types. 599 * 600 * @sp: SRB command to process 601 * @cmd_pkt: Command type 3 IOCB 602 * @tot_dsds: Total number of segments to transfer 603 */ 604 static inline void 605 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt, 606 uint16_t tot_dsds) 607 { 608 uint16_t avail_dsds; 609 uint32_t *cur_dsd; 610 scsi_qla_host_t *ha; 611 struct scsi_cmnd *cmd; 612 struct scatterlist *sg; 613 int i; 614 615 cmd = sp->cmd; 616 617 /* Update entry type to indicate Command Type 3 IOCB */ 618 *((uint32_t *)(&cmd_pkt->entry_type)) = 619 __constant_cpu_to_le32(COMMAND_TYPE_7); 620 621 /* No data transfer */ 622 if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) { 623 cmd_pkt->byte_count = __constant_cpu_to_le32(0); 624 return; 625 } 626 627 ha = sp->ha; 628 629 /* Set transfer direction */ 630 if (cmd->sc_data_direction == DMA_TO_DEVICE) 631 cmd_pkt->task_mgmt_flags = 632 __constant_cpu_to_le16(TMF_WRITE_DATA); 633 else if (cmd->sc_data_direction == DMA_FROM_DEVICE) 634 cmd_pkt->task_mgmt_flags = 635 __constant_cpu_to_le16(TMF_READ_DATA); 636 637 /* One DSD is available in the Command Type 3 IOCB */ 638 avail_dsds = 1; 639 cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address; 640 641 /* Load data segments */ 642 643 scsi_for_each_sg(cmd, sg, tot_dsds, i) { 644 dma_addr_t sle_dma; 645 cont_a64_entry_t *cont_pkt; 646 647 /* Allocate additional continuation packets? */ 648 if (avail_dsds == 0) { 649 /* 650 * Five DSDs are available in the Continuation 651 * Type 1 IOCB. 652 */ 653 cont_pkt = qla2x00_prep_cont_type1_iocb(ha); 654 cur_dsd = (uint32_t *)cont_pkt->dseg_0_address; 655 avail_dsds = 5; 656 } 657 658 sle_dma = sg_dma_address(sg); 659 *cur_dsd++ = cpu_to_le32(LSD(sle_dma)); 660 *cur_dsd++ = cpu_to_le32(MSD(sle_dma)); 661 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg)); 662 avail_dsds--; 663 } 664 } 665 666 667 /** 668 * qla24xx_start_scsi() - Send a SCSI command to the ISP 669 * @sp: command to send to the ISP 670 * 671 * Returns non-zero if a failure occured, else zero. 672 */ 673 int 674 qla24xx_start_scsi(srb_t *sp) 675 { 676 int ret, nseg; 677 unsigned long flags; 678 scsi_qla_host_t *ha; 679 struct scsi_cmnd *cmd; 680 uint32_t *clr_ptr; 681 uint32_t index; 682 uint32_t handle; 683 struct cmd_type_7 *cmd_pkt; 684 uint16_t cnt; 685 uint16_t req_cnt; 686 uint16_t tot_dsds; 687 struct device_reg_24xx __iomem *reg; 688 689 /* Setup device pointers. */ 690 ret = 0; 691 ha = sp->ha; 692 reg = &ha->iobase->isp24; 693 cmd = sp->cmd; 694 /* So we know we haven't pci_map'ed anything yet */ 695 tot_dsds = 0; 696 697 /* Send marker if required */ 698 if (ha->marker_needed != 0) { 699 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) { 700 return QLA_FUNCTION_FAILED; 701 } 702 ha->marker_needed = 0; 703 } 704 705 /* Acquire ring specific lock */ 706 spin_lock_irqsave(&ha->hardware_lock, flags); 707 708 /* Check for room in outstanding command list. */ 709 handle = ha->current_outstanding_cmd; 710 for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) { 711 handle++; 712 if (handle == MAX_OUTSTANDING_COMMANDS) 713 handle = 1; 714 if (!ha->outstanding_cmds[handle]) 715 break; 716 } 717 if (index == MAX_OUTSTANDING_COMMANDS) 718 goto queuing_error; 719 720 /* Map the sg table so we have an accurate count of sg entries needed */ 721 if (scsi_sg_count(cmd)) { 722 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd), 723 scsi_sg_count(cmd), cmd->sc_data_direction); 724 if (unlikely(!nseg)) 725 goto queuing_error; 726 } else 727 nseg = 0; 728 729 tot_dsds = nseg; 730 731 req_cnt = qla24xx_calc_iocbs(tot_dsds); 732 if (ha->req_q_cnt < (req_cnt + 2)) { 733 cnt = (uint16_t)RD_REG_DWORD_RELAXED(®->req_q_out); 734 if (ha->req_ring_index < cnt) 735 ha->req_q_cnt = cnt - ha->req_ring_index; 736 else 737 ha->req_q_cnt = ha->request_q_length - 738 (ha->req_ring_index - cnt); 739 } 740 if (ha->req_q_cnt < (req_cnt + 2)) 741 goto queuing_error; 742 743 /* Build command packet. */ 744 ha->current_outstanding_cmd = handle; 745 ha->outstanding_cmds[handle] = sp; 746 sp->ha = ha; 747 sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle; 748 ha->req_q_cnt -= req_cnt; 749 750 cmd_pkt = (struct cmd_type_7 *)ha->request_ring_ptr; 751 cmd_pkt->handle = handle; 752 753 /* Zero out remaining portion of packet. */ 754 /* tagged queuing modifier -- default is TSK_SIMPLE (0). */ 755 clr_ptr = (uint32_t *)cmd_pkt + 2; 756 memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8); 757 cmd_pkt->dseg_count = cpu_to_le16(tot_dsds); 758 759 /* Set NPORT-ID and LUN number*/ 760 cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id); 761 cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa; 762 cmd_pkt->port_id[1] = sp->fcport->d_id.b.area; 763 cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain; 764 cmd_pkt->vp_index = sp->fcport->vp_idx; 765 766 int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun); 767 host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun)); 768 769 /* Load SCSI command packet. */ 770 memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len); 771 host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb)); 772 773 cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd)); 774 775 /* Build IOCB segments */ 776 qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds); 777 778 /* Set total data segment count. */ 779 cmd_pkt->entry_count = (uint8_t)req_cnt; 780 wmb(); 781 782 /* Adjust ring index. */ 783 ha->req_ring_index++; 784 if (ha->req_ring_index == ha->request_q_length) { 785 ha->req_ring_index = 0; 786 ha->request_ring_ptr = ha->request_ring; 787 } else 788 ha->request_ring_ptr++; 789 790 sp->flags |= SRB_DMA_VALID; 791 792 /* Set chip new ring index. */ 793 WRT_REG_DWORD(®->req_q_in, ha->req_ring_index); 794 RD_REG_DWORD_RELAXED(®->req_q_in); /* PCI Posting. */ 795 796 /* Manage unprocessed RIO/ZIO commands in response queue. */ 797 if (ha->flags.process_response_queue && 798 ha->response_ring_ptr->signature != RESPONSE_PROCESSED) 799 qla24xx_process_response_queue(ha); 800 801 spin_unlock_irqrestore(&ha->hardware_lock, flags); 802 return QLA_SUCCESS; 803 804 queuing_error: 805 if (tot_dsds) 806 scsi_dma_unmap(cmd); 807 808 spin_unlock_irqrestore(&ha->hardware_lock, flags); 809 810 return QLA_FUNCTION_FAILED; 811 } 812