1 /* 2 * QLogic iSCSI HBA Driver 3 * Copyright (c) 2003-2013 QLogic Corporation 4 * 5 * See LICENSE.qla4xxx for copyright and licensing details. 6 */ 7 8 #include "ql4_def.h" 9 #include "ql4_glbl.h" 10 #include "ql4_dbg.h" 11 #include "ql4_inline.h" 12 13 #include <scsi/scsi_tcq.h> 14 15 static int 16 qla4xxx_space_in_req_ring(struct scsi_qla_host *ha, uint16_t req_cnt) 17 { 18 uint16_t cnt; 19 20 /* Calculate number of free request entries. */ 21 if ((req_cnt + 2) >= ha->req_q_count) { 22 cnt = (uint16_t) ha->isp_ops->rd_shdw_req_q_out(ha); 23 if (ha->request_in < cnt) 24 ha->req_q_count = cnt - ha->request_in; 25 else 26 ha->req_q_count = REQUEST_QUEUE_DEPTH - 27 (ha->request_in - cnt); 28 } 29 30 /* Check if room for request in request ring. */ 31 if ((req_cnt + 2) < ha->req_q_count) 32 return 1; 33 else 34 return 0; 35 } 36 37 static void qla4xxx_advance_req_ring_ptr(struct scsi_qla_host *ha) 38 { 39 /* Advance request queue pointer */ 40 if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) { 41 ha->request_in = 0; 42 ha->request_ptr = ha->request_ring; 43 } else { 44 ha->request_in++; 45 ha->request_ptr++; 46 } 47 } 48 49 /** 50 * qla4xxx_get_req_pkt - returns a valid entry in request queue. 51 * @ha: Pointer to host adapter structure. 52 * @queue_entry: Pointer to pointer to queue entry structure 53 * 54 * This routine performs the following tasks: 55 * - returns the current request_in pointer (if queue not full) 56 * - advances the request_in pointer 57 * - checks for queue full 58 **/ 59 static int qla4xxx_get_req_pkt(struct scsi_qla_host *ha, 60 struct queue_entry **queue_entry) 61 { 62 uint16_t req_cnt = 1; 63 64 if (qla4xxx_space_in_req_ring(ha, req_cnt)) { 65 *queue_entry = ha->request_ptr; 66 memset(*queue_entry, 0, sizeof(**queue_entry)); 67 68 qla4xxx_advance_req_ring_ptr(ha); 69 ha->req_q_count -= req_cnt; 70 return QLA_SUCCESS; 71 } 72 73 return QLA_ERROR; 74 } 75 76 /** 77 * qla4xxx_send_marker_iocb - issues marker iocb to HBA 78 * @ha: Pointer to host adapter structure. 79 * @ddb_entry: Pointer to device database entry 80 * @lun: SCSI LUN 81 * @marker_type: marker identifier 82 * 83 * This routine issues a marker IOCB. 84 **/ 85 int qla4xxx_send_marker_iocb(struct scsi_qla_host *ha, 86 struct ddb_entry *ddb_entry, int lun, uint16_t mrkr_mod) 87 { 88 struct qla4_marker_entry *marker_entry; 89 unsigned long flags = 0; 90 uint8_t status = QLA_SUCCESS; 91 92 /* Acquire hardware specific lock */ 93 spin_lock_irqsave(&ha->hardware_lock, flags); 94 95 /* Get pointer to the queue entry for the marker */ 96 if (qla4xxx_get_req_pkt(ha, (struct queue_entry **) &marker_entry) != 97 QLA_SUCCESS) { 98 status = QLA_ERROR; 99 goto exit_send_marker; 100 } 101 102 /* Put the marker in the request queue */ 103 marker_entry->hdr.entryType = ET_MARKER; 104 marker_entry->hdr.entryCount = 1; 105 marker_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index); 106 marker_entry->modifier = cpu_to_le16(mrkr_mod); 107 int_to_scsilun(lun, &marker_entry->lun); 108 wmb(); 109 110 /* Tell ISP it's got a new I/O request */ 111 ha->isp_ops->queue_iocb(ha); 112 113 exit_send_marker: 114 spin_unlock_irqrestore(&ha->hardware_lock, flags); 115 return status; 116 } 117 118 static struct continuation_t1_entry * 119 qla4xxx_alloc_cont_entry(struct scsi_qla_host *ha) 120 { 121 struct continuation_t1_entry *cont_entry; 122 123 cont_entry = (struct continuation_t1_entry *)ha->request_ptr; 124 125 qla4xxx_advance_req_ring_ptr(ha); 126 127 /* Load packet defaults */ 128 cont_entry->hdr.entryType = ET_CONTINUE; 129 cont_entry->hdr.entryCount = 1; 130 cont_entry->hdr.systemDefined = (uint8_t) cpu_to_le16(ha->request_in); 131 132 return cont_entry; 133 } 134 135 static uint16_t qla4xxx_calc_request_entries(uint16_t dsds) 136 { 137 uint16_t iocbs; 138 139 iocbs = 1; 140 if (dsds > COMMAND_SEG) { 141 iocbs += (dsds - COMMAND_SEG) / CONTINUE_SEG; 142 if ((dsds - COMMAND_SEG) % CONTINUE_SEG) 143 iocbs++; 144 } 145 return iocbs; 146 } 147 148 static void qla4xxx_build_scsi_iocbs(struct srb *srb, 149 struct command_t3_entry *cmd_entry, 150 uint16_t tot_dsds) 151 { 152 struct scsi_qla_host *ha; 153 uint16_t avail_dsds; 154 struct data_seg_a64 *cur_dsd; 155 struct scsi_cmnd *cmd; 156 struct scatterlist *sg; 157 int i; 158 159 cmd = srb->cmd; 160 ha = srb->ha; 161 162 if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) { 163 /* No data being transferred */ 164 cmd_entry->ttlByteCnt = __constant_cpu_to_le32(0); 165 return; 166 } 167 168 avail_dsds = COMMAND_SEG; 169 cur_dsd = (struct data_seg_a64 *) & (cmd_entry->dataseg[0]); 170 171 scsi_for_each_sg(cmd, sg, tot_dsds, i) { 172 dma_addr_t sle_dma; 173 174 /* Allocate additional continuation packets? */ 175 if (avail_dsds == 0) { 176 struct continuation_t1_entry *cont_entry; 177 178 cont_entry = qla4xxx_alloc_cont_entry(ha); 179 cur_dsd = 180 (struct data_seg_a64 *) 181 &cont_entry->dataseg[0]; 182 avail_dsds = CONTINUE_SEG; 183 } 184 185 sle_dma = sg_dma_address(sg); 186 cur_dsd->base.addrLow = cpu_to_le32(LSDW(sle_dma)); 187 cur_dsd->base.addrHigh = cpu_to_le32(MSDW(sle_dma)); 188 cur_dsd->count = cpu_to_le32(sg_dma_len(sg)); 189 avail_dsds--; 190 191 cur_dsd++; 192 } 193 } 194 195 void qla4_83xx_queue_iocb(struct scsi_qla_host *ha) 196 { 197 writel(ha->request_in, &ha->qla4_83xx_reg->req_q_in); 198 readl(&ha->qla4_83xx_reg->req_q_in); 199 } 200 201 void qla4_83xx_complete_iocb(struct scsi_qla_host *ha) 202 { 203 writel(ha->response_out, &ha->qla4_83xx_reg->rsp_q_out); 204 readl(&ha->qla4_83xx_reg->rsp_q_out); 205 } 206 207 /** 208 * qla4_82xx_queue_iocb - Tell ISP it's got new request(s) 209 * @ha: pointer to host adapter structure. 210 * 211 * This routine notifies the ISP that one or more new request 212 * queue entries have been placed on the request queue. 213 **/ 214 void qla4_82xx_queue_iocb(struct scsi_qla_host *ha) 215 { 216 uint32_t dbval = 0; 217 218 dbval = 0x14 | (ha->func_num << 5); 219 dbval = dbval | (0 << 8) | (ha->request_in << 16); 220 221 qla4_82xx_wr_32(ha, ha->nx_db_wr_ptr, ha->request_in); 222 } 223 224 /** 225 * qla4_82xx_complete_iocb - Tell ISP we're done with response(s) 226 * @ha: pointer to host adapter structure. 227 * 228 * This routine notifies the ISP that one or more response/completion 229 * queue entries have been processed by the driver. 230 * This also clears the interrupt. 231 **/ 232 void qla4_82xx_complete_iocb(struct scsi_qla_host *ha) 233 { 234 writel(ha->response_out, &ha->qla4_82xx_reg->rsp_q_out); 235 readl(&ha->qla4_82xx_reg->rsp_q_out); 236 } 237 238 /** 239 * qla4xxx_queue_iocb - Tell ISP it's got new request(s) 240 * @ha: pointer to host adapter structure. 241 * 242 * This routine is notifies the ISP that one or more new request 243 * queue entries have been placed on the request queue. 244 **/ 245 void qla4xxx_queue_iocb(struct scsi_qla_host *ha) 246 { 247 writel(ha->request_in, &ha->reg->req_q_in); 248 readl(&ha->reg->req_q_in); 249 } 250 251 /** 252 * qla4xxx_complete_iocb - Tell ISP we're done with response(s) 253 * @ha: pointer to host adapter structure. 254 * 255 * This routine is notifies the ISP that one or more response/completion 256 * queue entries have been processed by the driver. 257 * This also clears the interrupt. 258 **/ 259 void qla4xxx_complete_iocb(struct scsi_qla_host *ha) 260 { 261 writel(ha->response_out, &ha->reg->rsp_q_out); 262 readl(&ha->reg->rsp_q_out); 263 } 264 265 /** 266 * qla4xxx_send_command_to_isp - issues command to HBA 267 * @ha: pointer to host adapter structure. 268 * @srb: pointer to SCSI Request Block to be sent to ISP 269 * 270 * This routine is called by qla4xxx_queuecommand to build an ISP 271 * command and pass it to the ISP for execution. 272 **/ 273 int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb) 274 { 275 struct scsi_cmnd *cmd = srb->cmd; 276 struct ddb_entry *ddb_entry; 277 struct command_t3_entry *cmd_entry; 278 int nseg; 279 uint16_t tot_dsds; 280 uint16_t req_cnt; 281 unsigned long flags; 282 uint32_t index; 283 char tag[2]; 284 285 /* Get real lun and adapter */ 286 ddb_entry = srb->ddb; 287 288 tot_dsds = 0; 289 290 /* Acquire hardware specific lock */ 291 spin_lock_irqsave(&ha->hardware_lock, flags); 292 293 index = (uint32_t)cmd->request->tag; 294 295 /* 296 * Check to see if adapter is online before placing request on 297 * request queue. If a reset occurs and a request is in the queue, 298 * the firmware will still attempt to process the request, retrieving 299 * garbage for pointers. 300 */ 301 if (!test_bit(AF_ONLINE, &ha->flags)) { 302 DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! " 303 "Do not issue command.\n", 304 ha->host_no, __func__)); 305 goto queuing_error; 306 } 307 308 /* Calculate the number of request entries needed. */ 309 nseg = scsi_dma_map(cmd); 310 if (nseg < 0) 311 goto queuing_error; 312 tot_dsds = nseg; 313 314 req_cnt = qla4xxx_calc_request_entries(tot_dsds); 315 if (!qla4xxx_space_in_req_ring(ha, req_cnt)) 316 goto queuing_error; 317 318 /* total iocbs active */ 319 if ((ha->iocb_cnt + req_cnt) >= ha->iocb_hiwat) 320 goto queuing_error; 321 322 /* Build command packet */ 323 cmd_entry = (struct command_t3_entry *) ha->request_ptr; 324 memset(cmd_entry, 0, sizeof(struct command_t3_entry)); 325 cmd_entry->hdr.entryType = ET_COMMAND; 326 cmd_entry->handle = cpu_to_le32(index); 327 cmd_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index); 328 329 int_to_scsilun(cmd->device->lun, &cmd_entry->lun); 330 cmd_entry->ttlByteCnt = cpu_to_le32(scsi_bufflen(cmd)); 331 memcpy(cmd_entry->cdb, cmd->cmnd, cmd->cmd_len); 332 cmd_entry->dataSegCnt = cpu_to_le16(tot_dsds); 333 cmd_entry->hdr.entryCount = req_cnt; 334 335 /* Set data transfer direction control flags 336 * NOTE: Look at data_direction bits iff there is data to be 337 * transferred, as the data direction bit is sometimed filled 338 * in when there is no data to be transferred */ 339 cmd_entry->control_flags = CF_NO_DATA; 340 if (scsi_bufflen(cmd)) { 341 if (cmd->sc_data_direction == DMA_TO_DEVICE) 342 cmd_entry->control_flags = CF_WRITE; 343 else if (cmd->sc_data_direction == DMA_FROM_DEVICE) 344 cmd_entry->control_flags = CF_READ; 345 346 ha->bytes_xfered += scsi_bufflen(cmd); 347 if (ha->bytes_xfered & ~0xFFFFF){ 348 ha->total_mbytes_xferred += ha->bytes_xfered >> 20; 349 ha->bytes_xfered &= 0xFFFFF; 350 } 351 } 352 353 /* Set tagged queueing control flags */ 354 cmd_entry->control_flags |= CF_SIMPLE_TAG; 355 if (scsi_populate_tag_msg(cmd, tag)) 356 switch (tag[0]) { 357 case MSG_HEAD_TAG: 358 cmd_entry->control_flags |= CF_HEAD_TAG; 359 break; 360 case MSG_ORDERED_TAG: 361 cmd_entry->control_flags |= CF_ORDERED_TAG; 362 break; 363 } 364 365 qla4xxx_advance_req_ring_ptr(ha); 366 qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds); 367 wmb(); 368 369 srb->cmd->host_scribble = (unsigned char *)(unsigned long)index; 370 371 /* update counters */ 372 srb->state = SRB_ACTIVE_STATE; 373 srb->flags |= SRB_DMA_VALID; 374 375 /* Track IOCB used */ 376 ha->iocb_cnt += req_cnt; 377 srb->iocb_cnt = req_cnt; 378 ha->req_q_count -= req_cnt; 379 380 ha->isp_ops->queue_iocb(ha); 381 spin_unlock_irqrestore(&ha->hardware_lock, flags); 382 383 return QLA_SUCCESS; 384 385 queuing_error: 386 if (tot_dsds) 387 scsi_dma_unmap(cmd); 388 389 spin_unlock_irqrestore(&ha->hardware_lock, flags); 390 391 return QLA_ERROR; 392 } 393 394 int qla4xxx_send_passthru0(struct iscsi_task *task) 395 { 396 struct passthru0 *passthru_iocb; 397 struct iscsi_session *sess = task->conn->session; 398 struct ddb_entry *ddb_entry = sess->dd_data; 399 struct scsi_qla_host *ha = ddb_entry->ha; 400 struct ql4_task_data *task_data = task->dd_data; 401 uint16_t ctrl_flags = 0; 402 unsigned long flags; 403 int ret = QLA_ERROR; 404 405 spin_lock_irqsave(&ha->hardware_lock, flags); 406 task_data->iocb_req_cnt = 1; 407 /* Put the IOCB on the request queue */ 408 if (!qla4xxx_space_in_req_ring(ha, task_data->iocb_req_cnt)) 409 goto queuing_error; 410 411 passthru_iocb = (struct passthru0 *) ha->request_ptr; 412 413 memset(passthru_iocb, 0, sizeof(struct passthru0)); 414 passthru_iocb->hdr.entryType = ET_PASSTHRU0; 415 passthru_iocb->hdr.systemDefined = SD_ISCSI_PDU; 416 passthru_iocb->hdr.entryCount = task_data->iocb_req_cnt; 417 passthru_iocb->handle = task->itt; 418 passthru_iocb->target = cpu_to_le16(ddb_entry->fw_ddb_index); 419 passthru_iocb->timeout = cpu_to_le16(PT_DEFAULT_TIMEOUT); 420 421 /* Setup the out & in DSDs */ 422 if (task_data->req_len) { 423 memcpy((uint8_t *)task_data->req_buffer + 424 sizeof(struct iscsi_hdr), task->data, task->data_count); 425 ctrl_flags |= PT_FLAG_SEND_BUFFER; 426 passthru_iocb->out_dsd.base.addrLow = 427 cpu_to_le32(LSDW(task_data->req_dma)); 428 passthru_iocb->out_dsd.base.addrHigh = 429 cpu_to_le32(MSDW(task_data->req_dma)); 430 passthru_iocb->out_dsd.count = 431 cpu_to_le32(task->data_count + 432 sizeof(struct iscsi_hdr)); 433 } 434 if (task_data->resp_len) { 435 passthru_iocb->in_dsd.base.addrLow = 436 cpu_to_le32(LSDW(task_data->resp_dma)); 437 passthru_iocb->in_dsd.base.addrHigh = 438 cpu_to_le32(MSDW(task_data->resp_dma)); 439 passthru_iocb->in_dsd.count = 440 cpu_to_le32(task_data->resp_len); 441 } 442 443 ctrl_flags |= (PT_FLAG_ISCSI_PDU | PT_FLAG_WAIT_4_RESPONSE); 444 passthru_iocb->control_flags = cpu_to_le16(ctrl_flags); 445 446 /* Update the request pointer */ 447 qla4xxx_advance_req_ring_ptr(ha); 448 wmb(); 449 450 /* Track IOCB used */ 451 ha->iocb_cnt += task_data->iocb_req_cnt; 452 ha->req_q_count -= task_data->iocb_req_cnt; 453 ha->isp_ops->queue_iocb(ha); 454 ret = QLA_SUCCESS; 455 456 queuing_error: 457 spin_unlock_irqrestore(&ha->hardware_lock, flags); 458 return ret; 459 } 460 461 static struct mrb *qla4xxx_get_new_mrb(struct scsi_qla_host *ha) 462 { 463 struct mrb *mrb; 464 465 mrb = kzalloc(sizeof(*mrb), GFP_KERNEL); 466 if (!mrb) 467 return mrb; 468 469 mrb->ha = ha; 470 return mrb; 471 } 472 473 static int qla4xxx_send_mbox_iocb(struct scsi_qla_host *ha, struct mrb *mrb, 474 uint32_t *in_mbox) 475 { 476 int rval = QLA_SUCCESS; 477 uint32_t i; 478 unsigned long flags; 479 uint32_t index = 0; 480 481 /* Acquire hardware specific lock */ 482 spin_lock_irqsave(&ha->hardware_lock, flags); 483 484 /* Get pointer to the queue entry for the marker */ 485 rval = qla4xxx_get_req_pkt(ha, (struct queue_entry **) &(mrb->mbox)); 486 if (rval != QLA_SUCCESS) 487 goto exit_mbox_iocb; 488 489 index = ha->mrb_index; 490 /* get valid mrb index*/ 491 for (i = 0; i < MAX_MRB; i++) { 492 index++; 493 if (index == MAX_MRB) 494 index = 1; 495 if (ha->active_mrb_array[index] == NULL) { 496 ha->mrb_index = index; 497 break; 498 } 499 } 500 501 mrb->iocb_cnt = 1; 502 ha->active_mrb_array[index] = mrb; 503 mrb->mbox->handle = index; 504 mrb->mbox->hdr.entryType = ET_MBOX_CMD; 505 mrb->mbox->hdr.entryCount = mrb->iocb_cnt; 506 memcpy(mrb->mbox->in_mbox, in_mbox, 32); 507 mrb->mbox_cmd = in_mbox[0]; 508 wmb(); 509 510 ha->iocb_cnt += mrb->iocb_cnt; 511 ha->isp_ops->queue_iocb(ha); 512 exit_mbox_iocb: 513 spin_unlock_irqrestore(&ha->hardware_lock, flags); 514 return rval; 515 } 516 517 int qla4xxx_ping_iocb(struct scsi_qla_host *ha, uint32_t options, 518 uint32_t payload_size, uint32_t pid, uint8_t *ipaddr) 519 { 520 uint32_t in_mbox[8]; 521 struct mrb *mrb = NULL; 522 int rval = QLA_SUCCESS; 523 524 memset(in_mbox, 0, sizeof(in_mbox)); 525 526 mrb = qla4xxx_get_new_mrb(ha); 527 if (!mrb) { 528 DEBUG2(ql4_printk(KERN_WARNING, ha, "%s: fail to get new mrb\n", 529 __func__)); 530 rval = QLA_ERROR; 531 goto exit_ping; 532 } 533 534 in_mbox[0] = MBOX_CMD_PING; 535 in_mbox[1] = options; 536 memcpy(&in_mbox[2], &ipaddr[0], 4); 537 memcpy(&in_mbox[3], &ipaddr[4], 4); 538 memcpy(&in_mbox[4], &ipaddr[8], 4); 539 memcpy(&in_mbox[5], &ipaddr[12], 4); 540 in_mbox[6] = payload_size; 541 542 mrb->pid = pid; 543 rval = qla4xxx_send_mbox_iocb(ha, mrb, in_mbox); 544 545 if (rval != QLA_SUCCESS) 546 goto exit_ping; 547 548 return rval; 549 exit_ping: 550 kfree(mrb); 551 return rval; 552 } 553