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 #include "ql4_glbl.h"
  10 #include "ql4_dbg.h"
  11 #include "ql4_inline.h"
  12
  13
  14 #include <scsi/scsi_tcq.h>
  15
  16 /**
  17  * qla4xxx_get_req_pkt - returns a valid entry in request queue.
  18  * @ha: Pointer to host adapter structure.
  19  * @queue_entry: Pointer to pointer to queue entry structure
  20  *
  21  * This routine performs the following tasks:
  22  *      - returns the current request_in pointer (if queue not full)
  23  *      - advances the request_in pointer
  24  *      - checks for queue full
  25  **/
  26 static int qla4xxx_get_req_pkt(struct scsi_qla_host *ha,
  27                                struct queue_entry **queue_entry)
  28 {
  29         uint16_t request_in;
  30         uint8_t status = QLA_SUCCESS;
  31
  32         *queue_entry = ha->request_ptr;
  33
  34         /* get the latest request_in and request_out index */
  35         request_in = ha->request_in;
  36         ha->request_out = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
  37
  38         /* Advance request queue pointer and check for queue full */
  39         if (request_in == (REQUEST_QUEUE_DEPTH - 1)) {
  40                 request_in = 0;
  41                 ha->request_ptr = ha->request_ring;
  42         } else {
  43                 request_in++;
  44                 ha->request_ptr++;
  45         }
  46
  47         /* request queue is full, try again later */
  48         if ((ha->iocb_cnt + 1) >= ha->iocb_hiwat) {
  49                 /* restore request pointer */
  50                 ha->request_ptr = *queue_entry;
  51                 status = QLA_ERROR;
  52         } else {
  53                 ha->request_in = request_in;
  54                 memset(*queue_entry, 0, sizeof(**queue_entry));
  55         }
  56
  57         return status;
  58 }
  59
  60 /**
  61  * qla4xxx_send_marker_iocb - issues marker iocb to HBA
  62  * @ha: Pointer to host adapter structure.
  63  * @ddb_entry: Pointer to device database entry
  64  * @lun: SCSI LUN
  65  * @marker_type: marker identifier
  66  *
  67  * This routine issues a marker IOCB.
  68  **/
  69 static int qla4xxx_send_marker_iocb(struct scsi_qla_host *ha,
  70                                     struct ddb_entry *ddb_entry, int lun)
  71 {
  72         struct qla4_marker_entry *marker_entry;
  73         unsigned long flags = 0;
  74         uint8_t status = QLA_SUCCESS;
  75
  76         /* Acquire hardware specific lock */
  77         spin_lock_irqsave(&ha->hardware_lock, flags);
  78
  79         /* Get pointer to the queue entry for the marker */
  80         if (qla4xxx_get_req_pkt(ha, (struct queue_entry **) &marker_entry) !=
  81             QLA_SUCCESS) {
  82                 status = QLA_ERROR;
  83                 goto exit_send_marker;
  84         }
  85
  86         /* Put the marker in the request queue */
  87         marker_entry->hdr.entryType = ET_MARKER;
  88         marker_entry->hdr.entryCount = 1;
  89         marker_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
  90         marker_entry->modifier = cpu_to_le16(MM_LUN_RESET);
  91         int_to_scsilun(lun, &marker_entry->lun);
  92         wmb();
  93
  94         /* Tell ISP it's got a new I/O request */
  95         writel(ha->request_in, &ha->reg->req_q_in);
  96         readl(&ha->reg->req_q_in);
  97
  98 exit_send_marker:
  99         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 100         return status;
 101 }
 102
 103 static struct continuation_t1_entry* qla4xxx_alloc_cont_entry(
 104         struct scsi_qla_host *ha)
 105 {
 106         struct continuation_t1_entry *cont_entry;
 107
 108         cont_entry = (struct continuation_t1_entry *)ha->request_ptr;
 109
 110         /* Advance request queue pointer */
 111         if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) {
 112                 ha->request_in = 0;
 113                 ha->request_ptr = ha->request_ring;
 114         } else {
 115                 ha->request_in++;
 116                 ha->request_ptr++;
 117         }
 118
 119         /* Load packet defaults */
 120         cont_entry->hdr.entryType = ET_CONTINUE;
 121         cont_entry->hdr.entryCount = 1;
 122         cont_entry->hdr.systemDefined = (uint8_t) cpu_to_le16(ha->request_in);
 123
 124         return cont_entry;
 125 }
 126
 127 static uint16_t qla4xxx_calc_request_entries(uint16_t dsds)
 128 {
 129         uint16_t iocbs;
 130
 131         iocbs = 1;
 132         if (dsds > COMMAND_SEG) {
 133                 iocbs += (dsds - COMMAND_SEG) / CONTINUE_SEG;
 134                 if ((dsds - COMMAND_SEG) % CONTINUE_SEG)
 135                         iocbs++;
 136         }
 137         return iocbs;
 138 }
 139
 140 static void qla4xxx_build_scsi_iocbs(struct srb *srb,
 141                                      struct command_t3_entry *cmd_entry,
 142                                      uint16_t tot_dsds)
 143 {
 144         struct scsi_qla_host *ha;
 145         uint16_t avail_dsds;
 146         struct data_seg_a64 *cur_dsd;
 147         struct scsi_cmnd *cmd;
 148         struct scatterlist *sg;
 149         int i;
 150
 151         cmd = srb->cmd;
 152         ha = srb->ha;
 153
 154         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 155                 /* No data being transferred */
 156                 cmd_entry->ttlByteCnt = __constant_cpu_to_le32(0);
 157                 return;
 158         }
 159
 160         avail_dsds = COMMAND_SEG;
 161         cur_dsd = (struct data_seg_a64 *) & (cmd_entry->dataseg[0]);
 162
 163         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
 164                 dma_addr_t sle_dma;
 165
 166                 /* Allocate additional continuation packets? */
 167                 if (avail_dsds == 0) {
 168                         struct continuation_t1_entry *cont_entry;
 169
 170                         cont_entry = qla4xxx_alloc_cont_entry(ha);
 171                         cur_dsd =
 172                                 (struct data_seg_a64 *)
 173                                 &cont_entry->dataseg[0];
 174                         avail_dsds = CONTINUE_SEG;
 175                 }
 176
 177                 sle_dma = sg_dma_address(sg);
 178                 cur_dsd->base.addrLow = cpu_to_le32(LSDW(sle_dma));
 179                 cur_dsd->base.addrHigh = cpu_to_le32(MSDW(sle_dma));
 180                 cur_dsd->count = cpu_to_le32(sg_dma_len(sg));
 181                 avail_dsds--;
 182
 183                 cur_dsd++;
 184         }
 185 }
 186
 187 /**
 188  * qla4xxx_send_command_to_isp - issues command to HBA
 189  * @ha: pointer to host adapter structure.
 190  * @srb: pointer to SCSI Request Block to be sent to ISP
 191  *
 192  * This routine is called by qla4xxx_queuecommand to build an ISP
 193  * command and pass it to the ISP for execution.
 194  **/
 195 int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
 196 {
 197         struct scsi_cmnd *cmd = srb->cmd;
 198         struct ddb_entry *ddb_entry;
 199         struct command_t3_entry *cmd_entry;
 200
 201         int nseg;
 202         uint16_t tot_dsds;
 203         uint16_t req_cnt;
 204
 205         unsigned long flags;
 206         uint16_t cnt;
 207         uint32_t index;
 208         char tag[2];
 209
 210         /* Get real lun and adapter */
 211         ddb_entry = srb->ddb;
 212
 213         /* Send marker(s) if needed. */
 214         if (ha->marker_needed == 1) {
 215                 if (qla4xxx_send_marker_iocb(ha, ddb_entry,
 216                                              cmd->device->lun) != QLA_SUCCESS)
 217                         return QLA_ERROR;
 218
 219                 ha->marker_needed = 0;
 220         }
 221         tot_dsds = 0;
 222
 223         /* Acquire hardware specific lock */
 224         spin_lock_irqsave(&ha->hardware_lock, flags);
 225
 226         index = (uint32_t)cmd->request->tag;
 227
 228         /* Calculate the number of request entries needed. */
 229         nseg = scsi_dma_map(cmd);
 230         if (nseg < 0)
 231                 goto queuing_error;
 232         tot_dsds = nseg;
 233
 234         req_cnt = qla4xxx_calc_request_entries(tot_dsds);
 235
 236         if (ha->req_q_count < (req_cnt + 2)) {
 237                 cnt = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
 238                 if (ha->request_in < cnt)
 239                         ha->req_q_count = cnt - ha->request_in;
 240                 else
 241                         ha->req_q_count = REQUEST_QUEUE_DEPTH -
 242                                 (ha->request_in - cnt);
 243         }
 244
 245         if (ha->req_q_count < (req_cnt + 2))
 246                 goto queuing_error;
 247
 248         /* total iocbs active */
 249         if ((ha->iocb_cnt + req_cnt) >= REQUEST_QUEUE_DEPTH)
 250                 goto queuing_error;
 251
 252         /* Build command packet */
 253         cmd_entry = (struct command_t3_entry *) ha->request_ptr;
 254         memset(cmd_entry, 0, sizeof(struct command_t3_entry));
 255         cmd_entry->hdr.entryType = ET_COMMAND;
 256         cmd_entry->handle = cpu_to_le32(index);
 257         cmd_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
 258         cmd_entry->connection_id = cpu_to_le16(ddb_entry->connection_id);
 259
 260         int_to_scsilun(cmd->device->lun, &cmd_entry->lun);
 261         cmd_entry->cmdSeqNum = cpu_to_le32(ddb_entry->CmdSn);
 262         cmd_entry->ttlByteCnt = cpu_to_le32(scsi_bufflen(cmd));
 263         memcpy(cmd_entry->cdb, cmd->cmnd, cmd->cmd_len);
 264         cmd_entry->dataSegCnt = cpu_to_le16(tot_dsds);
 265         cmd_entry->hdr.entryCount = req_cnt;
 266
 267         /* Set data transfer direction control flags
 268          * NOTE: Look at data_direction bits iff there is data to be
 269          *       transferred, as the data direction bit is sometimed filled
 270          *       in when there is no data to be transferred */
 271         cmd_entry->control_flags = CF_NO_DATA;
 272         if (scsi_bufflen(cmd)) {
 273                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
 274                         cmd_entry->control_flags = CF_WRITE;
 275                 else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 276                         cmd_entry->control_flags = CF_READ;
 277
 278                 ha->bytes_xfered += scsi_bufflen(cmd);
 279                 if (ha->bytes_xfered & ~0xFFFFF){
 280                         ha->total_mbytes_xferred += ha->bytes_xfered >> 20;
 281                         ha->bytes_xfered &= 0xFFFFF;
 282                 }
 283         }
 284
 285         /* Set tagged queueing control flags */
 286         cmd_entry->control_flags |= CF_SIMPLE_TAG;
 287         if (scsi_populate_tag_msg(cmd, tag))
 288                 switch (tag[0]) {
 289                 case MSG_HEAD_TAG:
 290                         cmd_entry->control_flags |= CF_HEAD_TAG;
 291                         break;
 292                 case MSG_ORDERED_TAG:
 293                         cmd_entry->control_flags |= CF_ORDERED_TAG;
 294                         break;
 295                 }
 296
 297
 298         /* Advance request queue pointer */
 299         ha->request_in++;
 300         if (ha->request_in == REQUEST_QUEUE_DEPTH) {
 301                 ha->request_in = 0;
 302                 ha->request_ptr = ha->request_ring;
 303         } else
 304                 ha->request_ptr++;
 305
 306
 307         qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds);
 308         wmb();
 309
 310         /*
 311          * Check to see if adapter is online before placing request on
 312          * request queue.  If a reset occurs and a request is in the queue,
 313          * the firmware will still attempt to process the request, retrieving
 314          * garbage for pointers.
 315          */
 316         if (!test_bit(AF_ONLINE, &ha->flags)) {
 317                 DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! "
 318                               "Do not issue command.\n",
 319                               ha->host_no, __func__));
 320                 goto queuing_error;
 321         }
 322
 323         srb->cmd->host_scribble = (unsigned char *)srb;
 324
 325         /* update counters */
 326         srb->state = SRB_ACTIVE_STATE;
 327         srb->flags |= SRB_DMA_VALID;
 328
 329         /* Track IOCB used */
 330         ha->iocb_cnt += req_cnt;
 331         srb->iocb_cnt = req_cnt;
 332         ha->req_q_count -= req_cnt;
 333
 334         /* Debug print statements */
 335         writel(ha->request_in, &ha->reg->req_q_in);
 336         readl(&ha->reg->req_q_in);
 337         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 338
 339         return QLA_SUCCESS;
 340
 341 queuing_error:
 342         if (tot_dsds)
 343                 scsi_dma_unmap(cmd);
 344
 345         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 346
 347         return QLA_ERROR;
 348 }
 349