git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/lpfc/lpfc_scsi.c

   1 /*******************************************************************
   2  * This file is part of the Emulex Linux Device Driver for         *
   3  * Fibre Channel Host Bus Adapters.                                *
   4  * Copyright (C) 2004-2006 Emulex.  All rights reserved.           *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
   8  *                                                                 *
   9  * This program is free software; you can redistribute it and/or   *
  10  * modify it under the terms of version 2 of the GNU General       *
  11  * Public License as published by the Free Software Foundation.    *
  12  * This program is distributed in the hope that it will be useful. *
  13  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  14  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  15  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  16  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  17  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  18  * more details, a copy of which can be found in the file COPYING  *
  19  * included with this package.                                     *
  20  *******************************************************************/
  21
  22 #include <linux/pci.h>
  23 #include <linux/interrupt.h>
  24
  25 #include <scsi/scsi.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <scsi/scsi_transport_fc.h>
  30
  31 #include "lpfc_version.h"
  32 #include "lpfc_hw.h"
  33 #include "lpfc_sli.h"
  34 #include "lpfc_disc.h"
  35 #include "lpfc_scsi.h"
  36 #include "lpfc.h"
  37 #include "lpfc_logmsg.h"
  38 #include "lpfc_crtn.h"
  39
  40 #define LPFC_RESET_WAIT  2
  41 #define LPFC_ABORT_WAIT  2
  42
  43
  44 static inline void
  45 lpfc_block_requests(struct lpfc_hba * phba)
  46 {
  47         down(&phba->hba_can_block);
  48         scsi_block_requests(phba->host);
  49 }
  50
  51 static inline void
  52 lpfc_unblock_requests(struct lpfc_hba * phba)
  53 {
  54         scsi_unblock_requests(phba->host);
  55         up(&phba->hba_can_block);
  56 }
  57
  58 /*
  59  * This routine allocates a scsi buffer, which contains all the necessary
  60  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
  61  * contains information to build the IOCB.  The DMAable region contains
  62  * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
  63  * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
  64  * and the BPL BDE is setup in the IOCB.
  65  */
  66 static struct lpfc_scsi_buf *
  67 lpfc_new_scsi_buf(struct lpfc_hba * phba)
  68 {
  69         struct lpfc_scsi_buf *psb;
  70         struct ulp_bde64 *bpl;
  71         IOCB_t *iocb;
  72         dma_addr_t pdma_phys;
  73         uint16_t iotag;
  74
  75         psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
  76         if (!psb)
  77                 return NULL;
  78         memset(psb, 0, sizeof (struct lpfc_scsi_buf));
  79         psb->scsi_hba = phba;
  80
  81         /*
  82          * Get memory from the pci pool to map the virt space to pci bus space
  83          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
  84          * struct fcp_rsp and the number of bde's necessary to support the
  85          * sg_tablesize.
  86          */
  87         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
  88                                                         &psb->dma_handle);
  89         if (!psb->data) {
  90                 kfree(psb);
  91                 return NULL;
  92         }
  93
  94         /* Initialize virtual ptrs to dma_buf region. */
  95         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
  96
  97         /* Allocate iotag for psb->cur_iocbq. */
  98         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
  99         if (iotag == 0) {
 100                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
 101                               psb->data, psb->dma_handle);
 102                 kfree (psb);
 103                 return NULL;
 104         }
 105         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
 106
 107         psb->fcp_cmnd = psb->data;
 108         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
 109         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
 110                                                         sizeof(struct fcp_rsp);
 111
 112         /* Initialize local short-hand pointers. */
 113         bpl = psb->fcp_bpl;
 114         pdma_phys = psb->dma_handle;
 115
 116         /*
 117          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
 118          * list bdes.  Initialize the first two and leave the rest for
 119          * queuecommand.
 120          */
 121         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 122         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 123         bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
 124         bpl->tus.f.bdeFlags = BUFF_USE_CMND;
 125         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 126         bpl++;
 127
 128         /* Setup the physical region for the FCP RSP */
 129         pdma_phys += sizeof (struct fcp_cmnd);
 130         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 131         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 132         bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
 133         bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
 134         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 135
 136         /*
 137          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
 138          * initialize it with all known data now.
 139          */
 140         pdma_phys += (sizeof (struct fcp_rsp));
 141         iocb = &psb->cur_iocbq.iocb;
 142         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
 143         iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
 144         iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
 145         iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 146         iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
 147         iocb->ulpBdeCount = 1;
 148         iocb->ulpClass = CLASS3;
 149
 150         return psb;
 151 }
 152
 153 static struct lpfc_scsi_buf*
 154 lpfc_get_scsi_buf(struct lpfc_hba * phba)
 155 {
 156         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
 157         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
 158         unsigned long iflag = 0;
 159
 160         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 161         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
 162         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 163         return  lpfc_cmd;
 164 }
 165
 166 static void
 167 lpfc_release_scsi_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 168 {
 169         unsigned long iflag = 0;
 170         /*
 171          * There are only two special cases to consider.  (1) the scsi command
 172          * requested scatter-gather usage or (2) the scsi command allocated
 173          * a request buffer, but did not request use_sg.  There is a third
 174          * case, but it does not require resource deallocation.
 175          */
 176         if ((psb->seg_cnt > 0) && (psb->pCmd->use_sg)) {
 177                 dma_unmap_sg(&phba->pcidev->dev, psb->pCmd->request_buffer,
 178                                 psb->seg_cnt, psb->pCmd->sc_data_direction);
 179         } else {
 180                  if ((psb->nonsg_phys) && (psb->pCmd->request_bufflen)) {
 181                         dma_unmap_single(&phba->pcidev->dev, psb->nonsg_phys,
 182                                                 psb->pCmd->request_bufflen,
 183                                                 psb->pCmd->sc_data_direction);
 184                  }
 185         }
 186
 187         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 188         psb->pCmd = NULL;
 189         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
 190         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 191 }
 192
 193 static int
 194 lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
 195 {
 196         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 197         struct scatterlist *sgel = NULL;
 198         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 199         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
 200         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 201         dma_addr_t physaddr;
 202         uint32_t i, num_bde = 0;
 203         int datadir = scsi_cmnd->sc_data_direction;
 204         int dma_error;
 205
 206         /*
 207          * There are three possibilities here - use scatter-gather segment, use
 208          * the single mapping, or neither.  Start the lpfc command prep by
 209          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 210          * data bde entry.
 211          */
 212         bpl += 2;
 213         if (scsi_cmnd->use_sg) {
 214                 /*
 215                  * The driver stores the segment count returned from pci_map_sg
 216                  * because this a count of dma-mappings used to map the use_sg
 217                  * pages.  They are not guaranteed to be the same for those
 218                  * architectures that implement an IOMMU.
 219                  */
 220                 sgel = (struct scatterlist *)scsi_cmnd->request_buffer;
 221                 lpfc_cmd->seg_cnt = dma_map_sg(&phba->pcidev->dev, sgel,
 222                                                 scsi_cmnd->use_sg, datadir);
 223                 if (lpfc_cmd->seg_cnt == 0)
 224                         return 1;
 225
 226                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
 227                         printk(KERN_ERR "%s: Too many sg segments from "
 228                                "dma_map_sg.  Config %d, seg_cnt %d",
 229                                __FUNCTION__, phba->cfg_sg_seg_cnt,
 230                                lpfc_cmd->seg_cnt);
 231                         dma_unmap_sg(&phba->pcidev->dev, sgel,
 232                                      lpfc_cmd->seg_cnt, datadir);
 233                         return 1;
 234                 }
 235
 236                 /*
 237                  * The driver established a maximum scatter-gather segment count
 238                  * during probe that limits the number of sg elements in any
 239                  * single scsi command.  Just run through the seg_cnt and format
 240                  * the bde's.
 241                  */
 242                 for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
 243                         physaddr = sg_dma_address(sgel);
 244                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 245                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 246                         bpl->tus.f.bdeSize = sg_dma_len(sgel);
 247                         if (datadir == DMA_TO_DEVICE)
 248                                 bpl->tus.f.bdeFlags = 0;
 249                         else
 250                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 251                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 252                         bpl++;
 253                         sgel++;
 254                         num_bde++;
 255                 }
 256         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 257                 physaddr = dma_map_single(&phba->pcidev->dev,
 258                                           scsi_cmnd->request_buffer,
 259                                           scsi_cmnd->request_bufflen,
 260                                           datadir);
 261                 dma_error = dma_mapping_error(physaddr);
 262                 if (dma_error) {
 263                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 264                                 "%d:0718 Unable to dma_map_single "
 265                                 "request_buffer: x%x\n",
 266                                 phba->brd_no, dma_error);
 267                         return 1;
 268                 }
 269
 270                 lpfc_cmd->nonsg_phys = physaddr;
 271                 bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 272                 bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 273                 bpl->tus.f.bdeSize = scsi_cmnd->request_bufflen;
 274                 if (datadir == DMA_TO_DEVICE)
 275                         bpl->tus.f.bdeFlags = 0;
 276                 else
 277                         bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 278                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
 279                 num_bde = 1;
 280                 bpl++;
 281         }
 282
 283         /*
 284          * Finish initializing those IOCB fields that are dependent on the
 285          * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
 286          * reinitialized since all iocb memory resources are used many times
 287          * for transmit, receive, and continuation bpl's.
 288          */
 289         iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 290         iocb_cmd->un.fcpi64.bdl.bdeSize +=
 291                 (num_bde * sizeof (struct ulp_bde64));
 292         iocb_cmd->ulpBdeCount = 1;
 293         iocb_cmd->ulpLe = 1;
 294         fcp_cmnd->fcpDl = be32_to_cpu(scsi_cmnd->request_bufflen);
 295         return 0;
 296 }
 297
 298 static void
 299 lpfc_handle_fcp_err(struct lpfc_scsi_buf *lpfc_cmd)
 300 {
 301         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 302         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
 303         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 304         struct lpfc_hba *phba = lpfc_cmd->scsi_hba;
 305         uint32_t fcpi_parm = lpfc_cmd->cur_iocbq.iocb.un.fcpi.fcpi_parm;
 306         uint32_t resp_info = fcprsp->rspStatus2;
 307         uint32_t scsi_status = fcprsp->rspStatus3;
 308         uint32_t host_status = DID_OK;
 309         uint32_t rsplen = 0;
 310
 311         /*
 312          *  If this is a task management command, there is no
 313          *  scsi packet associated with this lpfc_cmd.  The driver
 314          *  consumes it.
 315          */
 316         if (fcpcmd->fcpCntl2) {
 317                 scsi_status = 0;
 318                 goto out;
 319         }
 320
 321         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 322                         "%d:0730 FCP command failed: RSP "
 323                         "Data: x%x x%x x%x x%x x%x x%x\n",
 324                         phba->brd_no, resp_info, scsi_status,
 325                         be32_to_cpu(fcprsp->rspResId),
 326                         be32_to_cpu(fcprsp->rspSnsLen),
 327                         be32_to_cpu(fcprsp->rspRspLen),
 328                         fcprsp->rspInfo3);
 329
 330         if (resp_info & RSP_LEN_VALID) {
 331                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
 332                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
 333                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
 334                         host_status = DID_ERROR;
 335                         goto out;
 336                 }
 337         }
 338
 339         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
 340                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
 341                 if (snslen > SCSI_SENSE_BUFFERSIZE)
 342                         snslen = SCSI_SENSE_BUFFERSIZE;
 343
 344                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
 345         }
 346
 347         cmnd->resid = 0;
 348         if (resp_info & RESID_UNDER) {
 349                 cmnd->resid = be32_to_cpu(fcprsp->rspResId);
 350
 351                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 352                                 "%d:0716 FCP Read Underrun, expected %d, "
 353                                 "residual %d Data: x%x x%x x%x\n", phba->brd_no,
 354                                 be32_to_cpu(fcpcmd->fcpDl), cmnd->resid,
 355                                 fcpi_parm, cmnd->cmnd[0], cmnd->underflow);
 356
 357                 /*
 358                  * The cmnd->underflow is the minimum number of bytes that must
 359                  * be transfered for this command.  Provided a sense condition
 360                  * is not present, make sure the actual amount transferred is at
 361                  * least the underflow value or fail.
 362                  */
 363                 if (!(resp_info & SNS_LEN_VALID) &&
 364                     (scsi_status == SAM_STAT_GOOD) &&
 365                     (cmnd->request_bufflen - cmnd->resid) < cmnd->underflow) {
 366                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 367                                         "%d:0717 FCP command x%x residual "
 368                                         "underrun converted to error "
 369                                         "Data: x%x x%x x%x\n", phba->brd_no,
 370                                         cmnd->cmnd[0], cmnd->request_bufflen,
 371                                         cmnd->resid, cmnd->underflow);
 372
 373                         host_status = DID_ERROR;
 374                 }
 375         } else if (resp_info & RESID_OVER) {
 376                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 377                                 "%d:0720 FCP command x%x residual "
 378                                 "overrun error. Data: x%x x%x \n",
 379                                 phba->brd_no, cmnd->cmnd[0],
 380                                 cmnd->request_bufflen, cmnd->resid);
 381                 host_status = DID_ERROR;
 382
 383         /*
 384          * Check SLI validation that all the transfer was actually done
 385          * (fcpi_parm should be zero). Apply check only to reads.
 386          */
 387         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
 388                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
 389                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 390                         "%d:0734 FCP Read Check Error Data: "
 391                         "x%x x%x x%x x%x\n", phba->brd_no,
 392                         be32_to_cpu(fcpcmd->fcpDl),
 393                         be32_to_cpu(fcprsp->rspResId),
 394                         fcpi_parm, cmnd->cmnd[0]);
 395                 host_status = DID_ERROR;
 396                 cmnd->resid = cmnd->request_bufflen;
 397         }
 398
 399  out:
 400         cmnd->result = ScsiResult(host_status, scsi_status);
 401 }
 402
 403 static void
 404 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 405                         struct lpfc_iocbq *pIocbOut)
 406 {
 407         struct lpfc_scsi_buf *lpfc_cmd =
 408                 (struct lpfc_scsi_buf *) pIocbIn->context1;
 409         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 410         struct lpfc_nodelist *pnode = rdata->pnode;
 411         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
 412         int result;
 413         struct scsi_device *sdev, *tmp_sdev;
 414         int depth = 0;
 415
 416         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 417         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 418
 419         if (lpfc_cmd->status) {
 420                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 421                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 422                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 423                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 424                         lpfc_cmd->status = IOSTAT_DEFAULT;
 425
 426                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 427                                 "%d:0729 FCP cmd x%x failed <%d/%d> status: "
 428                                 "x%x result: x%x Data: x%x x%x\n",
 429                                 phba->brd_no, cmd->cmnd[0], cmd->device->id,
 430                                 cmd->device->lun, lpfc_cmd->status,
 431                                 lpfc_cmd->result, pIocbOut->iocb.ulpContext,
 432                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 433
 434                 switch (lpfc_cmd->status) {
 435                 case IOSTAT_FCP_RSP_ERROR:
 436                         /* Call FCP RSP handler to determine result */
 437                         lpfc_handle_fcp_err(lpfc_cmd);
 438                         break;
 439                 case IOSTAT_NPORT_BSY:
 440                 case IOSTAT_FABRIC_BSY:
 441                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
 442                         break;
 443                 default:
 444                         cmd->result = ScsiResult(DID_ERROR, 0);
 445                         break;
 446                 }
 447
 448                 if ((pnode == NULL )
 449                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
 450                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
 451         } else {
 452                 cmd->result = ScsiResult(DID_OK, 0);
 453         }
 454
 455         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
 456                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
 457
 458                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 459                                 "%d:0710 Iodone <%d/%d> cmd %p, error x%x "
 460                                 "SNS x%x x%x Data: x%x x%x\n",
 461                                 phba->brd_no, cmd->device->id,
 462                                 cmd->device->lun, cmd, cmd->result,
 463                                 *lp, *(lp + 3), cmd->retries, cmd->resid);
 464         }
 465
 466         result = cmd->result;
 467         sdev = cmd->device;
 468         cmd->scsi_done(cmd);
 469
 470         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 471                 lpfc_release_scsi_buf(phba, lpfc_cmd);
 472                 return;
 473         }
 474
 475         if (!result && pnode != NULL &&
 476            ((jiffies - pnode->last_ramp_up_time) >
 477                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 478            ((jiffies - pnode->last_q_full_time) >
 479                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 480            (phba->cfg_lun_queue_depth > sdev->queue_depth)) {
 481                 shost_for_each_device(tmp_sdev, sdev->host) {
 482                         if (phba->cfg_lun_queue_depth > tmp_sdev->queue_depth) {
 483                                 if (tmp_sdev->id != sdev->id)
 484                                         continue;
 485                                 if (tmp_sdev->ordered_tags)
 486                                         scsi_adjust_queue_depth(tmp_sdev,
 487                                                 MSG_ORDERED_TAG,
 488                                                 tmp_sdev->queue_depth+1);
 489                                 else
 490                                         scsi_adjust_queue_depth(tmp_sdev,
 491                                                 MSG_SIMPLE_TAG,
 492                                                 tmp_sdev->queue_depth+1);
 493
 494                                 pnode->last_ramp_up_time = jiffies;
 495                         }
 496                 }
 497         }
 498
 499         /*
 500          * Check for queue full.  If the lun is reporting queue full, then
 501          * back off the lun queue depth to prevent target overloads.
 502          */
 503         if (result == SAM_STAT_TASK_SET_FULL && pnode != NULL) {
 504                 pnode->last_q_full_time = jiffies;
 505
 506                 shost_for_each_device(tmp_sdev, sdev->host) {
 507                         if (tmp_sdev->id != sdev->id)
 508                                 continue;
 509                         depth = scsi_track_queue_full(tmp_sdev,
 510                                         tmp_sdev->queue_depth - 1);
 511                 }
 512                 /*
 513                  * The queue depth cannot be lowered any more.
 514                  * Modify the returned error code to store
 515                  * the final depth value set by
 516                  * scsi_track_queue_full.
 517                  */
 518                 if (depth == -1)
 519                         depth = sdev->host->cmd_per_lun;
 520
 521                 if (depth) {
 522                         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 523                                 "%d:0711 detected queue full - lun queue depth "
 524                                 " adjusted to %d.\n", phba->brd_no, depth);
 525                 }
 526         }
 527
 528         lpfc_release_scsi_buf(phba, lpfc_cmd);
 529 }
 530
 531 static void
 532 lpfc_scsi_prep_cmnd(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd,
 533                         struct lpfc_nodelist *pnode)
 534 {
 535         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 536         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 537         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 538         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
 539         int datadir = scsi_cmnd->sc_data_direction;
 540
 541         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
 542         /* clear task management bits */
 543         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
 544
 545         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 546                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 547
 548         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
 549
 550         if (scsi_cmnd->device->tagged_supported) {
 551                 switch (scsi_cmnd->tag) {
 552                 case HEAD_OF_QUEUE_TAG:
 553                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
 554                         break;
 555                 case ORDERED_QUEUE_TAG:
 556                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
 557                         break;
 558                 default:
 559                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
 560                         break;
 561                 }
 562         } else
 563                 fcp_cmnd->fcpCntl1 = 0;
 564
 565         /*
 566          * There are three possibilities here - use scatter-gather segment, use
 567          * the single mapping, or neither.  Start the lpfc command prep by
 568          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 569          * data bde entry.
 570          */
 571         if (scsi_cmnd->use_sg) {
 572                 if (datadir == DMA_TO_DEVICE) {
 573                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 574                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 575                         iocb_cmd->ulpPU = 0;
 576                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 577                         phba->fc4OutputRequests++;
 578                 } else {
 579                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 580                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 581                         iocb_cmd->un.fcpi.fcpi_parm =
 582                                 scsi_cmnd->request_bufflen;
 583                         fcp_cmnd->fcpCntl3 = READ_DATA;
 584                         phba->fc4InputRequests++;
 585                 }
 586         } else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
 587                 if (datadir == DMA_TO_DEVICE) {
 588                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 589                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 590                         iocb_cmd->ulpPU = 0;
 591                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 592                         phba->fc4OutputRequests++;
 593                 } else {
 594                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 595                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 596                         iocb_cmd->un.fcpi.fcpi_parm =
 597                                 scsi_cmnd->request_bufflen;
 598                         fcp_cmnd->fcpCntl3 = READ_DATA;
 599                         phba->fc4InputRequests++;
 600                 }
 601         } else {
 602                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
 603                 iocb_cmd->un.fcpi.fcpi_parm = 0;
 604                 iocb_cmd->ulpPU = 0;
 605                 fcp_cmnd->fcpCntl3 = 0;
 606                 phba->fc4ControlRequests++;
 607         }
 608
 609         /*
 610          * Finish initializing those IOCB fields that are independent
 611          * of the scsi_cmnd request_buffer
 612          */
 613         piocbq->iocb.ulpContext = pnode->nlp_rpi;
 614         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
 615                 piocbq->iocb.ulpFCP2Rcvy = 1;
 616
 617         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
 618         piocbq->context1  = lpfc_cmd;
 619         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
 620         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
 621 }
 622
 623 static int
 624 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba,
 625                              struct lpfc_scsi_buf *lpfc_cmd,
 626                              uint8_t task_mgmt_cmd)
 627 {
 628         struct lpfc_sli *psli;
 629         struct lpfc_iocbq *piocbq;
 630         IOCB_t *piocb;
 631         struct fcp_cmnd *fcp_cmnd;
 632         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 633         struct lpfc_nodelist *ndlp = rdata->pnode;
 634
 635         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
 636                 return 0;
 637         }
 638
 639         psli = &phba->sli;
 640         piocbq = &(lpfc_cmd->cur_iocbq);
 641         piocb = &piocbq->iocb;
 642
 643         fcp_cmnd = lpfc_cmd->fcp_cmnd;
 644         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 645                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 646         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
 647
 648         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
 649
 650         piocb->ulpContext = ndlp->nlp_rpi;
 651         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
 652                 piocb->ulpFCP2Rcvy = 1;
 653         }
 654         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
 655
 656         /* ulpTimeout is only one byte */
 657         if (lpfc_cmd->timeout > 0xff) {
 658                 /*
 659                  * Do not timeout the command at the firmware level.
 660                  * The driver will provide the timeout mechanism.
 661                  */
 662                 piocb->ulpTimeout = 0;
 663         } else {
 664                 piocb->ulpTimeout = lpfc_cmd->timeout;
 665         }
 666
 667         return (1);
 668 }
 669
 670 static int
 671 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba,
 672                     unsigned  tgt_id, struct lpfc_rport_data *rdata)
 673 {
 674         struct lpfc_iocbq *iocbq;
 675         struct lpfc_iocbq *iocbqrsp;
 676         int ret;
 677
 678         lpfc_cmd->rdata = rdata;
 679         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_TARGET_RESET);
 680         if (!ret)
 681                 return FAILED;
 682
 683         lpfc_cmd->scsi_hba = phba;
 684         iocbq = &lpfc_cmd->cur_iocbq;
 685         iocbqrsp = lpfc_sli_get_iocbq(phba);
 686
 687         if (!iocbqrsp)
 688                 return FAILED;
 689
 690         /* Issue Target Reset to TGT <num> */
 691         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 692                         "%d:0702 Issue Target Reset to TGT %d "
 693                         "Data: x%x x%x\n",
 694                         phba->brd_no, tgt_id, rdata->pnode->nlp_rpi,
 695                         rdata->pnode->nlp_flag);
 696
 697         ret = lpfc_sli_issue_iocb_wait(phba,
 698                                        &phba->sli.ring[phba->sli.fcp_ring],
 699                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 700         if (ret != IOCB_SUCCESS) {
 701                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 702                 ret = FAILED;
 703         } else {
 704                 ret = SUCCESS;
 705                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 706                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 707                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 708                         (lpfc_cmd->result & IOERR_DRVR_MASK))
 709                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 710         }
 711
 712         lpfc_sli_release_iocbq(phba, iocbqrsp);
 713         return ret;
 714 }
 715
 716 const char *
 717 lpfc_info(struct Scsi_Host *host)
 718 {
 719         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata;
 720         int len;
 721         static char  lpfcinfobuf[384];
 722
 723         memset(lpfcinfobuf,0,384);
 724         if (phba && phba->pcidev){
 725                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
 726                 len = strlen(lpfcinfobuf);
 727                 snprintf(lpfcinfobuf + len,
 728                         384-len,
 729                         " on PCI bus %02x device %02x irq %d",
 730                         phba->pcidev->bus->number,
 731                         phba->pcidev->devfn,
 732                         phba->pcidev->irq);
 733                 len = strlen(lpfcinfobuf);
 734                 if (phba->Port[0]) {
 735                         snprintf(lpfcinfobuf + len,
 736                                  384-len,
 737                                  " port %s",
 738                                  phba->Port);
 739                 }
 740         }
 741         return lpfcinfobuf;
 742 }
 743
 744 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
 745 {
 746         unsigned long  poll_tmo_expires =
 747                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
 748
 749         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
 750                 mod_timer(&phba->fcp_poll_timer,
 751                           poll_tmo_expires);
 752 }
 753
 754 void lpfc_poll_start_timer(struct lpfc_hba * phba)
 755 {
 756         lpfc_poll_rearm_timer(phba);
 757 }
 758
 759 void lpfc_poll_timeout(unsigned long ptr)
 760 {
 761         struct lpfc_hba *phba = (struct lpfc_hba *)ptr;
 762         unsigned long iflag;
 763
 764         spin_lock_irqsave(phba->host->host_lock, iflag);
 765
 766         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 767                 lpfc_sli_poll_fcp_ring (phba);
 768                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 769                         lpfc_poll_rearm_timer(phba);
 770         }
 771
 772         spin_unlock_irqrestore(phba->host->host_lock, iflag);
 773 }
 774
 775 static int
 776 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 777 {
 778         struct lpfc_hba *phba =
 779                 (struct lpfc_hba *) cmnd->device->host->hostdata;
 780         struct lpfc_sli *psli = &phba->sli;
 781         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 782         struct lpfc_nodelist *ndlp = rdata->pnode;
 783         struct lpfc_scsi_buf *lpfc_cmd;
 784         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 785         int err;
 786
 787         err = fc_remote_port_chkready(rport);
 788         if (err) {
 789                 cmnd->result = err;
 790                 goto out_fail_command;
 791         }
 792
 793         /*
 794          * Catch race where our node has transitioned, but the
 795          * transport is still transitioning.
 796          */
 797         if (!ndlp) {
 798                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
 799                 goto out_fail_command;
 800         }
 801         lpfc_cmd = lpfc_get_scsi_buf (phba);
 802         if (lpfc_cmd == NULL) {
 803                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 804                                 "%d:0707 driver's buffer pool is empty, "
 805                                 "IO busied\n", phba->brd_no);
 806                 goto out_host_busy;
 807         }
 808
 809         /*
 810          * Store the midlayer's command structure for the completion phase
 811          * and complete the command initialization.
 812          */
 813         lpfc_cmd->pCmd  = cmnd;
 814         lpfc_cmd->rdata = rdata;
 815         lpfc_cmd->timeout = 0;
 816         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
 817         cmnd->scsi_done = done;
 818
 819         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
 820         if (err)
 821                 goto out_host_busy_free_buf;
 822
 823         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
 824
 825         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
 826                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
 827         if (err)
 828                 goto out_host_busy_free_buf;
 829
 830         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 831                 lpfc_sli_poll_fcp_ring(phba);
 832                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 833                         lpfc_poll_rearm_timer(phba);
 834         }
 835
 836         return 0;
 837
 838  out_host_busy_free_buf:
 839         lpfc_release_scsi_buf(phba, lpfc_cmd);
 840  out_host_busy:
 841         return SCSI_MLQUEUE_HOST_BUSY;
 842
 843  out_fail_command:
 844         done(cmnd);
 845         return 0;
 846 }
 847
 848
 849 static int
 850 lpfc_abort_handler(struct scsi_cmnd *cmnd)
 851 {
 852         struct Scsi_Host *shost = cmnd->device->host;
 853         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 854         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
 855         struct lpfc_iocbq *iocb;
 856         struct lpfc_iocbq *abtsiocb;
 857         struct lpfc_scsi_buf *lpfc_cmd;
 858         IOCB_t *cmd, *icmd;
 859         unsigned int loop_count = 0;
 860         int ret = SUCCESS;
 861
 862         lpfc_block_requests(phba);
 863         spin_lock_irq(shost->host_lock);
 864
 865         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
 866         BUG_ON(!lpfc_cmd);
 867
 868         /*
 869          * If pCmd field of the corresponding lpfc_scsi_buf structure
 870          * points to a different SCSI command, then the driver has
 871          * already completed this command, but the midlayer did not
 872          * see the completion before the eh fired.  Just return
 873          * SUCCESS.
 874          */
 875         iocb = &lpfc_cmd->cur_iocbq;
 876         if (lpfc_cmd->pCmd != cmnd)
 877                 goto out;
 878
 879         BUG_ON(iocb->context1 != lpfc_cmd);
 880
 881         abtsiocb = lpfc_sli_get_iocbq(phba);
 882         if (abtsiocb == NULL) {
 883                 ret = FAILED;
 884                 goto out;
 885         }
 886
 887         /*
 888          * The scsi command can not be in txq and it is in flight because the
 889          * pCmd is still pointig at the SCSI command we have to abort. There
 890          * is no need to search the txcmplq. Just send an abort to the FW.
 891          */
 892
 893         cmd = &iocb->iocb;
 894         icmd = &abtsiocb->iocb;
 895         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
 896         icmd->un.acxri.abortContextTag = cmd->ulpContext;
 897         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
 898
 899         icmd->ulpLe = 1;
 900         icmd->ulpClass = cmd->ulpClass;
 901         if (phba->hba_state >= LPFC_LINK_UP)
 902                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
 903         else
 904                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
 905
 906         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
 907         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
 908                 lpfc_sli_release_iocbq(phba, abtsiocb);
 909                 ret = FAILED;
 910                 goto out;
 911         }
 912
 913         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 914                 lpfc_sli_poll_fcp_ring (phba);
 915
 916         /* Wait for abort to complete */
 917         while (lpfc_cmd->pCmd == cmnd)
 918         {
 919                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 920                         lpfc_sli_poll_fcp_ring (phba);
 921
 922                 spin_unlock_irq(phba->host->host_lock);
 923                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
 924                 spin_lock_irq(phba->host->host_lock);
 925                 if (++loop_count
 926                     > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
 927                         break;
 928         }
 929
 930         if (lpfc_cmd->pCmd == cmnd) {
 931                 ret = FAILED;
 932                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
 933                                 "%d:0748 abort handler timed out waiting for "
 934                                 "abort to complete: ret %#x, ID %d, LUN %d, "
 935                                 "snum %#lx\n",
 936                                 phba->brd_no,  ret, cmnd->device->id,
 937                                 cmnd->device->lun, cmnd->serial_number);
 938         }
 939
 940  out:
 941         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 942                         "%d:0749 SCSI Layer I/O Abort Request "
 943                         "Status x%x ID %d LUN %d snum %#lx\n",
 944                         phba->brd_no, ret, cmnd->device->id,
 945                         cmnd->device->lun, cmnd->serial_number);
 946
 947         spin_unlock_irq(shost->host_lock);
 948         lpfc_unblock_requests(phba);
 949
 950         return ret;
 951 }
 952
 953 static int
 954 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
 955 {
 956         struct Scsi_Host *shost = cmnd->device->host;
 957         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
 958         struct lpfc_scsi_buf *lpfc_cmd;
 959         struct lpfc_iocbq *iocbq, *iocbqrsp;
 960         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 961         struct lpfc_nodelist *pnode = rdata->pnode;
 962         uint32_t cmd_result = 0, cmd_status = 0;
 963         int ret = FAILED;
 964         int cnt, loopcnt;
 965
 966         lpfc_block_requests(phba);
 967         spin_lock_irq(shost->host_lock);
 968         /*
 969          * If target is not in a MAPPED state, delay the reset until
 970          * target is rediscovered or nodev timeout expires.
 971          */
 972         while ( 1 ) {
 973                 if (!pnode)
 974                         break;
 975
 976                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
 977                         spin_unlock_irq(phba->host->host_lock);
 978                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
 979                         spin_lock_irq(phba->host->host_lock);
 980                 }
 981                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
 982                         break;
 983         }
 984
 985         lpfc_cmd = lpfc_get_scsi_buf (phba);
 986         if (lpfc_cmd == NULL)
 987                 goto out;
 988
 989         lpfc_cmd->pCmd = cmnd;
 990         lpfc_cmd->timeout = 60;
 991         lpfc_cmd->scsi_hba = phba;
 992         lpfc_cmd->rdata = rdata;
 993
 994         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_LUN_RESET);
 995         if (!ret)
 996                 goto out_free_scsi_buf;
 997
 998         iocbq = &lpfc_cmd->cur_iocbq;
 999
1000         /* get a buffer for this IOCB command response */
1001         iocbqrsp = lpfc_sli_get_iocbq(phba);
1002         if (iocbqrsp == NULL)
1003                 goto out_free_scsi_buf;
1004
1005         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
1006                         "%d:0703 Issue LUN Reset to TGT %d LUN %d "
1007                         "Data: x%x x%x\n", phba->brd_no, cmnd->device->id,
1008                         cmnd->device->lun, pnode->nlp_rpi, pnode->nlp_flag);
1009
1010         ret = lpfc_sli_issue_iocb_wait(phba,
1011                                        &phba->sli.ring[phba->sli.fcp_ring],
1012                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
1013         if (ret == IOCB_SUCCESS)
1014                 ret = SUCCESS;
1015
1016
1017         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
1018         cmd_status = iocbqrsp->iocb.ulpStatus;
1019
1020         lpfc_sli_release_iocbq(phba, iocbqrsp);
1021         lpfc_release_scsi_buf(phba, lpfc_cmd);
1022
1023         /*
1024          * All outstanding txcmplq I/Os should have been aborted by the device.
1025          * Unfortunately, some targets do not abide by this forcing the driver
1026          * to double check.
1027          */
1028         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1029                                 cmnd->device->id, cmnd->device->lun,
1030                                 LPFC_CTX_LUN);
1031         if (cnt)
1032                 lpfc_sli_abort_iocb(phba,
1033                                     &phba->sli.ring[phba->sli.fcp_ring],
1034                                     cmnd->device->id, cmnd->device->lun,
1035                                     0, LPFC_CTX_LUN);
1036         loopcnt = 0;
1037         while(cnt) {
1038                 spin_unlock_irq(phba->host->host_lock);
1039                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1040                 spin_lock_irq(phba->host->host_lock);
1041
1042                 if (++loopcnt
1043                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1044                         break;
1045
1046                 cnt = lpfc_sli_sum_iocb(phba,
1047                                         &phba->sli.ring[phba->sli.fcp_ring],
1048                                         cmnd->device->id, cmnd->device->lun,
1049                                         LPFC_CTX_LUN);
1050         }
1051
1052         if (cnt) {
1053                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1054                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
1055                         phba->brd_no, cnt);
1056                 ret = FAILED;
1057         }
1058
1059 out_free_scsi_buf:
1060         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1061                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
1062                         "Data: x%x x%x x%x\n",
1063                         phba->brd_no, cmnd->device->id,cmnd->device->lun,
1064                         ret, cmd_status, cmd_result);
1065
1066 out:
1067         spin_unlock_irq(shost->host_lock);
1068         lpfc_unblock_requests(phba);
1069         return ret;
1070 }
1071
1072 static int
1073 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1074 {
1075         struct Scsi_Host *shost = cmnd->device->host;
1076         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
1077         struct lpfc_nodelist *ndlp = NULL;
1078         int match;
1079         int ret = FAILED, i, err_count = 0;
1080         int cnt, loopcnt;
1081         struct lpfc_scsi_buf * lpfc_cmd;
1082
1083         lpfc_block_requests(phba);
1084         spin_lock_irq(shost->host_lock);
1085
1086         lpfc_cmd = lpfc_get_scsi_buf(phba);
1087         if (lpfc_cmd == NULL)
1088                 goto out;
1089
1090         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1091         lpfc_cmd->timeout = 60;
1092         lpfc_cmd->pCmd = cmnd;
1093         lpfc_cmd->scsi_hba = phba;
1094
1095         /*
1096          * Since the driver manages a single bus device, reset all
1097          * targets known to the driver.  Should any target reset
1098          * fail, this routine returns failure to the midlayer.
1099          */
1100         for (i = 0; i < MAX_FCP_TARGET; i++) {
1101                 /* Search the mapped list for this target ID */
1102                 match = 0;
1103                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1104                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1105                                 match = 1;
1106                                 break;
1107                         }
1108                 }
1109                 if (!match)
1110                         continue;
1111
1112                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba,
1113                                           i, ndlp->rport->dd_data);
1114                 if (ret != SUCCESS) {
1115                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1116                                 "%d:0713 Bus Reset on target %d failed\n",
1117                                 phba->brd_no, i);
1118                         err_count++;
1119                 }
1120         }
1121
1122         if (err_count == 0)
1123                 ret = SUCCESS;
1124
1125         lpfc_release_scsi_buf(phba, lpfc_cmd);
1126
1127         /*
1128          * All outstanding txcmplq I/Os should have been aborted by
1129          * the targets.  Unfortunately, some targets do not abide by
1130          * this forcing the driver to double check.
1131          */
1132         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1133                                 0, 0, LPFC_CTX_HOST);
1134         if (cnt)
1135                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1136                                     0, 0, 0, LPFC_CTX_HOST);
1137         loopcnt = 0;
1138         while(cnt) {
1139                 spin_unlock_irq(phba->host->host_lock);
1140                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1141                 spin_lock_irq(phba->host->host_lock);
1142
1143                 if (++loopcnt
1144                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1145                         break;
1146
1147                 cnt = lpfc_sli_sum_iocb(phba,
1148                                         &phba->sli.ring[phba->sli.fcp_ring],
1149                                         0, 0, LPFC_CTX_HOST);
1150         }
1151
1152         if (cnt) {
1153                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1154                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1155                    phba->brd_no, cnt, i);
1156                 ret = FAILED;
1157         }
1158
1159         lpfc_printf_log(phba,
1160                         KERN_ERR,
1161                         LOG_FCP,
1162                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1163                         phba->brd_no, ret);
1164 out:
1165         spin_unlock_irq(shost->host_lock);
1166         lpfc_unblock_requests(phba);
1167         return ret;
1168 }
1169
1170 static int
1171 lpfc_slave_alloc(struct scsi_device *sdev)
1172 {
1173         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata;
1174         struct lpfc_scsi_buf *scsi_buf = NULL;
1175         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1176         uint32_t total = 0, i;
1177         uint32_t num_to_alloc = 0;
1178         unsigned long flags;
1179
1180         if (!rport || fc_remote_port_chkready(rport))
1181                 return -ENXIO;
1182
1183         sdev->hostdata = rport->dd_data;
1184
1185         /*
1186          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1187          * available list of scsi buffers.  Don't allocate more than the
1188          * HBA limit conveyed to the midlayer via the host structure.  The
1189          * formula accounts for the lun_queue_depth + error handlers + 1
1190          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1191          */
1192         total = phba->total_scsi_bufs;
1193         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1194         if (total >= phba->cfg_hba_queue_depth) {
1195                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1196                                 "%d:0704 At limitation of %d preallocated "
1197                                 "command buffers\n", phba->brd_no, total);
1198                 return 0;
1199         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1200                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1201                                 "%d:0705 Allocation request of %d command "
1202                                 "buffers will exceed max of %d.  Reducing "
1203                                 "allocation request to %d.\n", phba->brd_no,
1204                                 num_to_alloc, phba->cfg_hba_queue_depth,
1205                                 (phba->cfg_hba_queue_depth - total));
1206                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1207         }
1208
1209         for (i = 0; i < num_to_alloc; i++) {
1210                 scsi_buf = lpfc_new_scsi_buf(phba);
1211                 if (!scsi_buf) {
1212                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1213                                         "%d:0706 Failed to allocate command "
1214                                         "buffer\n", phba->brd_no);
1215                         break;
1216                 }
1217
1218                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1219                 phba->total_scsi_bufs++;
1220                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1221                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1222         }
1223         return 0;
1224 }
1225
1226 static int
1227 lpfc_slave_configure(struct scsi_device *sdev)
1228 {
1229         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata;
1230         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1231
1232         if (sdev->tagged_supported)
1233                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1234         else
1235                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1236
1237         /*
1238          * Initialize the fc transport attributes for the target
1239          * containing this scsi device.  Also note that the driver's
1240          * target pointer is stored in the starget_data for the
1241          * driver's sysfs entry point functions.
1242          */
1243         rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;
1244
1245         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1246                 lpfc_sli_poll_fcp_ring(phba);
1247                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1248                         lpfc_poll_rearm_timer(phba);
1249         }
1250
1251         return 0;
1252 }
1253
1254 static void
1255 lpfc_slave_destroy(struct scsi_device *sdev)
1256 {
1257         sdev->hostdata = NULL;
1258         return;
1259 }
1260
1261 struct scsi_host_template lpfc_template = {
1262         .module                 = THIS_MODULE,
1263         .name                   = LPFC_DRIVER_NAME,
1264         .info                   = lpfc_info,
1265         .queuecommand           = lpfc_queuecommand,
1266         .eh_abort_handler       = lpfc_abort_handler,
1267         .eh_device_reset_handler= lpfc_reset_lun_handler,
1268         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1269         .slave_alloc            = lpfc_slave_alloc,
1270         .slave_configure        = lpfc_slave_configure,
1271         .slave_destroy          = lpfc_slave_destroy,
1272         .this_id                = -1,
1273         .sg_tablesize           = LPFC_SG_SEG_CNT,
1274         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1275         .use_clustering         = ENABLE_CLUSTERING,
1276         .shost_attrs            = lpfc_host_attrs,
1277         .max_sectors            = 0xFFFF,
1278 };