release/src-rt-6.x.4708/linux/linux-2.6.36/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 #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 /**
 196  * qla4_8xxx_queue_iocb - Tell ISP it's got new request(s)
 197  * @ha: pointer to host adapter structure.
 198  *
 199  * This routine notifies the ISP that one or more new request
 200  * queue entries have been placed on the request queue.
 201  **/
 202 void qla4_8xxx_queue_iocb(struct scsi_qla_host *ha)
 203 {
 204         uint32_t dbval = 0;
 205         unsigned long wtime;
 206
 207         dbval = 0x14 | (ha->func_num << 5);
 208         dbval = dbval | (0 << 8) | (ha->request_in << 16);
 209         writel(dbval, (unsigned long __iomem *)ha->nx_db_wr_ptr);
 210         wmb();
 211
 212         wtime = jiffies + (2 * HZ);
 213         while (readl((void __iomem *)ha->nx_db_rd_ptr) != dbval &&
 214             !time_after_eq(jiffies, wtime)) {
 215                 writel(dbval, (unsigned long __iomem *)ha->nx_db_wr_ptr);
 216                 wmb();
 217         }
 218 }
 219
 220 /**
 221  * qla4_8xxx_complete_iocb - Tell ISP we're done with response(s)
 222  * @ha: pointer to host adapter structure.
 223  *
 224  * This routine notifies the ISP that one or more response/completion
 225  * queue entries have been processed by the driver.
 226  * This also clears the interrupt.
 227  **/
 228 void qla4_8xxx_complete_iocb(struct scsi_qla_host *ha)
 229 {
 230         writel(ha->response_out, &ha->qla4_8xxx_reg->rsp_q_out);
 231         readl(&ha->qla4_8xxx_reg->rsp_q_out);
 232 }
 233
 234 /**
 235  * qla4xxx_queue_iocb - Tell ISP it's got new request(s)
 236  * @ha: pointer to host adapter structure.
 237  *
 238  * This routine is notifies the ISP that one or more new request
 239  * queue entries have been placed on the request queue.
 240  **/
 241 void qla4xxx_queue_iocb(struct scsi_qla_host *ha)
 242 {
 243         writel(ha->request_in, &ha->reg->req_q_in);
 244         readl(&ha->reg->req_q_in);
 245 }
 246
 247 /**
 248  * qla4xxx_complete_iocb - Tell ISP we're done with response(s)
 249  * @ha: pointer to host adapter structure.
 250  *
 251  * This routine is notifies the ISP that one or more response/completion
 252  * queue entries have been processed by the driver.
 253  * This also clears the interrupt.
 254  **/
 255 void qla4xxx_complete_iocb(struct scsi_qla_host *ha)
 256 {
 257         writel(ha->response_out, &ha->reg->rsp_q_out);
 258         readl(&ha->reg->rsp_q_out);
 259 }
 260
 261 /**
 262  * qla4xxx_send_command_to_isp - issues command to HBA
 263  * @ha: pointer to host adapter structure.
 264  * @srb: pointer to SCSI Request Block to be sent to ISP
 265  *
 266  * This routine is called by qla4xxx_queuecommand to build an ISP
 267  * command and pass it to the ISP for execution.
 268  **/
 269 int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
 270 {
 271         struct scsi_cmnd *cmd = srb->cmd;
 272         struct ddb_entry *ddb_entry;
 273         struct command_t3_entry *cmd_entry;
 274         int nseg;
 275         uint16_t tot_dsds;
 276         uint16_t req_cnt;
 277         unsigned long flags;
 278         uint32_t index;
 279         char tag[2];
 280
 281         /* Get real lun and adapter */
 282         ddb_entry = srb->ddb;
 283
 284         tot_dsds = 0;
 285
 286         /* Acquire hardware specific lock */
 287         spin_lock_irqsave(&ha->hardware_lock, flags);
 288
 289         index = (uint32_t)cmd->request->tag;
 290
 291         /*
 292          * Check to see if adapter is online before placing request on
 293          * request queue.  If a reset occurs and a request is in the queue,
 294          * the firmware will still attempt to process the request, retrieving
 295          * garbage for pointers.
 296          */
 297         if (!test_bit(AF_ONLINE, &ha->flags)) {
 298                 DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! "
 299                               "Do not issue command.\n",
 300                               ha->host_no, __func__));
 301                 goto queuing_error;
 302         }
 303
 304         /* Calculate the number of request entries needed. */
 305         nseg = scsi_dma_map(cmd);
 306         if (nseg < 0)
 307                 goto queuing_error;
 308         tot_dsds = nseg;
 309
 310         req_cnt = qla4xxx_calc_request_entries(tot_dsds);
 311         if (!qla4xxx_space_in_req_ring(ha, req_cnt))
 312                 goto queuing_error;
 313
 314         /* total iocbs active */
 315         if ((ha->iocb_cnt + req_cnt) >= REQUEST_QUEUE_DEPTH)
 316                 goto queuing_error;
 317
 318         /* Build command packet */
 319         cmd_entry = (struct command_t3_entry *) ha->request_ptr;
 320         memset(cmd_entry, 0, sizeof(struct command_t3_entry));
 321         cmd_entry->hdr.entryType = ET_COMMAND;
 322         cmd_entry->handle = cpu_to_le32(index);
 323         cmd_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
 324         cmd_entry->connection_id = cpu_to_le16(ddb_entry->connection_id);
 325
 326         int_to_scsilun(cmd->device->lun, &cmd_entry->lun);
 327         cmd_entry->cmdSeqNum = cpu_to_le32(ddb_entry->CmdSn);
 328         cmd_entry->ttlByteCnt = cpu_to_le32(scsi_bufflen(cmd));
 329         memcpy(cmd_entry->cdb, cmd->cmnd, cmd->cmd_len);
 330         cmd_entry->dataSegCnt = cpu_to_le16(tot_dsds);
 331         cmd_entry->hdr.entryCount = req_cnt;
 332
 333         /* Set data transfer direction control flags
 334          * NOTE: Look at data_direction bits iff there is data to be
 335          *       transferred, as the data direction bit is sometimed filled
 336          *       in when there is no data to be transferred */
 337         cmd_entry->control_flags = CF_NO_DATA;
 338         if (scsi_bufflen(cmd)) {
 339                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
 340                         cmd_entry->control_flags = CF_WRITE;
 341                 else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
 342                         cmd_entry->control_flags = CF_READ;
 343
 344                 ha->bytes_xfered += scsi_bufflen(cmd);
 345                 if (ha->bytes_xfered & ~0xFFFFF){
 346                         ha->total_mbytes_xferred += ha->bytes_xfered >> 20;
 347                         ha->bytes_xfered &= 0xFFFFF;
 348                 }
 349         }
 350
 351         /* Set tagged queueing control flags */
 352         cmd_entry->control_flags |= CF_SIMPLE_TAG;
 353         if (scsi_populate_tag_msg(cmd, tag))
 354                 switch (tag[0]) {
 355                 case MSG_HEAD_TAG:
 356                         cmd_entry->control_flags |= CF_HEAD_TAG;
 357                         break;
 358                 case MSG_ORDERED_TAG:
 359                         cmd_entry->control_flags |= CF_ORDERED_TAG;
 360                         break;
 361                 }
 362
 363         qla4xxx_advance_req_ring_ptr(ha);
 364         qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds);
 365         wmb();
 366
 367         srb->cmd->host_scribble = (unsigned char *)(unsigned long)index;
 368
 369         /* update counters */
 370         srb->state = SRB_ACTIVE_STATE;
 371         srb->flags |= SRB_DMA_VALID;
 372
 373         /* Track IOCB used */
 374         ha->iocb_cnt += req_cnt;
 375         srb->iocb_cnt = req_cnt;
 376         ha->req_q_count -= req_cnt;
 377
 378         ha->isp_ops->queue_iocb(ha);
 379         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 380
 381         return QLA_SUCCESS;
 382
 383 queuing_error:
 384         if (tot_dsds)
 385                 scsi_dma_unmap(cmd);
 386
 387         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 388
 389         return QLA_ERROR;
 390 }