drivers/scsi/qla4xxx/ql4_iocb.c

   1 /*
   2  * QLogic iSCSI HBA Driver
   3  * Copyright (c)  2003-2006 QLogic Corporation
   4  *
   5  * See LICENSE.qla4xxx for copyright and licensing details.
   6  */
   7
   8 #include "ql4_def.h"
   9
  10 #include <scsi/scsi_tcq.h>
  11
  12 /**
  13  * qla4xxx_get_req_pkt - returns a valid entry in request queue.
  14  * @ha: Pointer to host adapter structure.
  15  * @queue_entry: Pointer to pointer to queue entry structure
  16  *
  17  * This routine performs the following tasks:
  18  *      - returns the current request_in pointer (if queue not full)
  19  *      - advances the request_in pointer
  20  *      - checks for queue full
  21  **/
  22 int qla4xxx_get_req_pkt(struct scsi_qla_host *ha,
  23                         struct queue_entry **queue_entry)
  24 {
  25         uint16_t request_in;
  26         uint8_t status = QLA_SUCCESS;
  27
  28         *queue_entry = ha->request_ptr;
  29
  30         /* get the latest request_in and request_out index */
  31         request_in = ha->request_in;
  32         ha->request_out = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
  33
  34         /* Advance request queue pointer and check for queue full */
  35         if (request_in == (REQUEST_QUEUE_DEPTH - 1)) {
  36                 request_in = 0;
  37                 ha->request_ptr = ha->request_ring;
  38         } else {
  39                 request_in++;
  40                 ha->request_ptr++;
  41         }
  42
  43         /* request queue is full, try again later */
  44         if ((ha->iocb_cnt + 1) >= ha->iocb_hiwat) {
  45                 /* restore request pointer */
  46                 ha->request_ptr = *queue_entry;
  47                 status = QLA_ERROR;
  48         } else {
  49                 ha->request_in = request_in;
  50                 memset(*queue_entry, 0, sizeof(**queue_entry));
  51         }
  52
  53         return status;
  54 }
  55
  56 /**
  57  * qla4xxx_send_marker_iocb - issues marker iocb to HBA
  58  * @ha: Pointer to host adapter structure.
  59  * @ddb_entry: Pointer to device database entry
  60  * @lun: SCSI LUN
  61  * @marker_type: marker identifier
  62  *
  63  * This routine issues a marker IOCB.
  64  **/
  65 int qla4xxx_send_marker_iocb(struct scsi_qla_host *ha,
  66                              struct ddb_entry *ddb_entry, int lun)
  67 {
  68         struct marker_entry *marker_entry;
  69         unsigned long flags = 0;
  70         uint8_t status = QLA_SUCCESS;
  71
  72         /* Acquire hardware specific lock */
  73         spin_lock_irqsave(&ha->hardware_lock, flags);
  74
  75         /* Get pointer to the queue entry for the marker */
  76         if (qla4xxx_get_req_pkt(ha, (struct queue_entry **) &marker_entry) !=
  77             QLA_SUCCESS) {
  78                 status = QLA_ERROR;
  79                 goto exit_send_marker;
  80         }
  81
  82         /* Put the marker in the request queue */
  83         marker_entry->hdr.entryType = ET_MARKER;
  84         marker_entry->hdr.entryCount = 1;
  85         marker_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
  86         marker_entry->modifier = cpu_to_le16(MM_LUN_RESET);
  87         int_to_scsilun(lun, &marker_entry->lun);
  88         wmb();
  89
  90         /* Tell ISP it's got a new I/O request */
  91         writel(ha->request_in, &ha->reg->req_q_in);
  92         readl(&ha->reg->req_q_in);
  93
  94 exit_send_marker:
  95         spin_unlock_irqrestore(&ha->hardware_lock, flags);
  96         return status;
  97 }
  98
  99 struct continuation_t1_entry* qla4xxx_alloc_cont_entry(
 100         struct scsi_qla_host *ha)
 101 {
 102         struct continuation_t1_entry *cont_entry;
 103
 104         cont_entry = (struct continuation_t1_entry *)ha->request_ptr;
 105
 106         /* Advance request queue pointer */
 107         if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) {
 108                 ha->request_in = 0;
 109                 ha->request_ptr = ha->request_ring;
 110         } else {
 111                 ha->request_in++;
 112                 ha->request_ptr++;
 113         }
 114
 115         /* Load packet defaults */
 116         cont_entry->hdr.entryType = ET_CONTINUE;
 117         cont_entry->hdr.entryCount = 1;
 118         cont_entry->hdr.systemDefined = (uint8_t) cpu_to_le16(ha->request_in);
 119
 120         return cont_entry;
 121 }
 122
 123 uint16_t qla4xxx_calc_request_entries(uint16_t dsds)
 124 {
 125         uint16_t iocbs;
 126
 127         iocbs = 1;
 128         if (dsds > COMMAND_SEG) {
 129                 iocbs += (dsds - COMMAND_SEG) / CONTINUE_SEG;
 130                 if ((dsds - COMMAND_SEG) % CONTINUE_SEG)
 131                         iocbs++;
 132         }
 133         return iocbs;
 134 }
 135
 136 void qla4xxx_build_scsi_iocbs(struct srb *srb,
 137                               struct command_t3_entry *cmd_entry,
 138                               uint16_t tot_dsds)
 139 {
 140         struct scsi_qla_host *ha;
 141         uint16_t avail_dsds;
 142         struct data_seg_a64 *cur_dsd;
 143         struct scsi_cmnd *cmd;
 144
 145         cmd = srb->cmd;
 146         ha = srb->ha;
 147
 148         if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
 149                 /* No data being transferred */
 150                 cmd_entry->ttlByteCnt = __constant_cpu_to_le32(0);
 151                 return;
 152         }
 153
 154         avail_dsds = COMMAND_SEG;
 155         cur_dsd = (struct data_seg_a64 *) & (cmd_entry->dataseg[0]);
 156
 157         /* Load data segments */
 158         if (cmd->use_sg) {
 159                 struct scatterlist *cur_seg;
 160                 struct scatterlist *end_seg;
 161
 162                 cur_seg = (struct scatterlist *)cmd->request_buffer;
 163                 end_seg = cur_seg + tot_dsds;
 164                 while (cur_seg < end_seg) {
 165                         dma_addr_t sle_dma;
 166
 167                         /* Allocate additional continuation packets? */
 168                         if (avail_dsds == 0) {
 169                                 struct continuation_t1_entry *cont_entry;
 170
 171                                 cont_entry = qla4xxx_alloc_cont_entry(ha);
 172                                 cur_dsd =
 173                                         (struct data_seg_a64 *)
 174                                         &cont_entry->dataseg[0];
 175                                 avail_dsds = CONTINUE_SEG;
 176                         }
 177
 178                         sle_dma = sg_dma_address(cur_seg);
 179                         cur_dsd->base.addrLow = cpu_to_le32(LSDW(sle_dma));
 180                         cur_dsd->base.addrHigh = cpu_to_le32(MSDW(sle_dma));
 181                         cur_dsd->count = cpu_to_le32(sg_dma_len(cur_seg));
 182                         avail_dsds--;
 183
 184                         cur_dsd++;
 185                         cur_seg++;
 186                 }
 187         } else {
 188                 cur_dsd->base.addrLow = cpu_to_le32(LSDW(srb->dma_handle));
 189                 cur_dsd->base.addrHigh = cpu_to_le32(MSDW(srb->dma_handle));
 190                 cur_dsd->count = cpu_to_le32(cmd->request_bufflen);
 191         }
 192 }
 193
 194 /**
 195  * qla4xxx_send_command_to_isp - issues command to HBA
 196  * @ha: pointer to host adapter structure.
 197  * @srb: pointer to SCSI Request Block to be sent to ISP
 198  *
 199  * This routine is called by qla4xxx_queuecommand to build an ISP
 200  * command and pass it to the ISP for execution.
 201  **/
 202 int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
 203 {
 204         struct scsi_cmnd *cmd = srb->cmd;
 205         struct ddb_entry *ddb_entry;
 206         struct command_t3_entry *cmd_entry;
 207         struct scatterlist *sg = NULL;
 208
 209         uint16_t tot_dsds;
 210         uint16_t req_cnt;
 211
 212         unsigned long flags;
 213         uint16_t cnt;
 214         uint32_t index;
 215         char tag[2];
 216
 217         /* Get real lun and adapter */
 218         ddb_entry = srb->ddb;
 219
 220         /* Send marker(s) if needed. */
 221         if (ha->marker_needed == 1) {
 222                 if (qla4xxx_send_marker_iocb(ha, ddb_entry,
 223                                              cmd->device->lun) != QLA_SUCCESS)
 224                         return QLA_ERROR;
 225
 226                 ha->marker_needed = 0;
 227         }
 228         tot_dsds = 0;
 229
 230         /* Acquire hardware specific lock */
 231         spin_lock_irqsave(&ha->hardware_lock, flags);
 232
 233         index = (uint32_t)cmd->request->tag;
 234
 235         /* Calculate the number of request entries needed. */
 236         if (cmd->use_sg) {
 237                 sg = (struct scatterlist *)cmd->request_buffer;
 238                 tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
 239                                       cmd->sc_data_direction);
 240                 if (tot_dsds == 0)
 241                         goto queuing_error;
 242         } else if (cmd->request_bufflen) {
 243                 dma_addr_t      req_dma;
 244
 245                 req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
 246                                          cmd->request_bufflen,
 247                                          cmd->sc_data_direction);
 248                 if (dma_mapping_error(req_dma))
 249                         goto queuing_error;
 250
 251                 srb->dma_handle = req_dma;
 252                 tot_dsds = 1;
 253         }
 254         req_cnt = qla4xxx_calc_request_entries(tot_dsds);
 255
 256         if (ha->req_q_count < (req_cnt + 2)) {
 257                 cnt = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
 258                 if (ha->request_in < cnt)
 259                         ha->req_q_count = cnt - ha->request_in;
 260                 else
 261                         ha->req_q_count = REQUEST_QUEUE_DEPTH -
 262                                 (ha->request_in - cnt);
 263         }
 264
 265         if (ha->req_q_count < (req_cnt + 2))
 266                 goto queuing_error;
 267
 268         /* total iocbs active */
 269         if ((ha->iocb_cnt + req_cnt) >= REQUEST_QUEUE_DEPTH)
 270                 goto queuing_error;
 271
 272         /* Build command packet */
 273         cmd_entry = (struct command_t3_entry *) ha->request_ptr;
 274         memset(cmd_entry, 0, sizeof(struct command_t3_entry));
 275         cmd_entry->hdr.entryType = ET_COMMAND;
 276         cmd_entry->handle = cpu_to_le32(index);
 277         cmd_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
 278         cmd_entry->connection_id = cpu_to_le16(ddb_entry->connection_id);
 279
 280         int_to_scsilun(cmd->device->lun, &cmd_entry->lun);
 281         cmd_entry->cmdSeqNum = cpu_to_le32(ddb_entry->CmdSn);
 282         cmd_entry->ttlByteCnt = cpu_to_le32(cmd->request_bufflen);
 283         memcpy(cmd_entry->cdb, cmd->cmnd, cmd->cmd_len);
 284         cmd_entry->dataSegCnt = cpu_to_le16(tot_dsds);
 285         cmd_entry->hdr.entryCount = req_cnt;
 286
 287         /* Set data transfer direction control flags
 288          * NOTE: Look at data_direction bits iff there is data to be
 289          *       transferred, as the data direction bit is sometimed filled
 290          *       in when there is no data to be transferred */
 291         cmd_entry->control_flags = CF_NO_DATA;
 292         if (cmd->request_bufflen) {
 293                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
 294                         cmd_entry->control_flags = CF_WRITE;
 295                 else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 296                         cmd_entry->control_flags = CF_READ;
 297
 298                 ha->bytes_xfered += cmd->request_bufflen;
 299                 if (ha->bytes_xfered & ~0xFFFFF){
 300                         ha->total_mbytes_xferred += ha->bytes_xfered >> 20;
 301                         ha->bytes_xfered &= 0xFFFFF;
 302                 }
 303         }
 304
 305         /* Set tagged queueing control flags */
 306         cmd_entry->control_flags |= CF_SIMPLE_TAG;
 307         if (scsi_populate_tag_msg(cmd, tag))
 308                 switch (tag[0]) {
 309                 case MSG_HEAD_TAG:
 310                         cmd_entry->control_flags |= CF_HEAD_TAG;
 311                         break;
 312                 case MSG_ORDERED_TAG:
 313                         cmd_entry->control_flags |= CF_ORDERED_TAG;
 314                         break;
 315                 }
 316
 317
 318         /* Advance request queue pointer */
 319         ha->request_in++;
 320         if (ha->request_in == REQUEST_QUEUE_DEPTH) {
 321                 ha->request_in = 0;
 322                 ha->request_ptr = ha->request_ring;
 323         } else
 324                 ha->request_ptr++;
 325
 326
 327         qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds);
 328         wmb();
 329
 330         /*
 331          * Check to see if adapter is online before placing request on
 332          * request queue.  If a reset occurs and a request is in the queue,
 333          * the firmware will still attempt to process the request, retrieving
 334          * garbage for pointers.
 335          */
 336         if (!test_bit(AF_ONLINE, &ha->flags)) {
 337                 DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! "
 338                               "Do not issue command.\n",
 339                               ha->host_no, __func__));
 340                 goto queuing_error;
 341         }
 342
 343         srb->cmd->host_scribble = (unsigned char *)srb;
 344
 345         /* update counters */
 346         srb->state = SRB_ACTIVE_STATE;
 347         srb->flags |= SRB_DMA_VALID;
 348
 349         /* Track IOCB used */
 350         ha->iocb_cnt += req_cnt;
 351         srb->iocb_cnt = req_cnt;
 352         ha->req_q_count -= req_cnt;
 353
 354         /* Debug print statements */
 355         writel(ha->request_in, &ha->reg->req_q_in);
 356         readl(&ha->reg->req_q_in);
 357         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 358
 359         return QLA_SUCCESS;
 360
 361 queuing_error:
 362
 363         if (cmd->use_sg && tot_dsds) {
 364                 sg = (struct scatterlist *) cmd->request_buffer;
 365                 pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
 366                              cmd->sc_data_direction);
 367         } else if (tot_dsds)
 368                 pci_unmap_single(ha->pdev, srb->dma_handle,
 369                                  cmd->request_bufflen, cmd->sc_data_direction);
 370         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 371
 372         return QLA_ERROR;
 373 }
 374