[PATCH] lpfc 8.1.3: Fix polling mode panic
[linux-2.6.git] / 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 scsi_device *scsi_dev = lpfc_cmd->pCmd->device;
633         struct lpfc_rport_data *rdata = scsi_dev->hostdata;
634         struct lpfc_nodelist *ndlp = rdata->pnode;
635
636         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
637                 return 0;
638         }
639
640         psli = &phba->sli;
641         piocbq = &(lpfc_cmd->cur_iocbq);
642         piocb = &piocbq->iocb;
643
644         fcp_cmnd = lpfc_cmd->fcp_cmnd;
645         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
646                         &lpfc_cmd->fcp_cmnd->fcp_lun);
647         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
648
649         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
650
651         piocb->ulpContext = ndlp->nlp_rpi;
652         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
653                 piocb->ulpFCP2Rcvy = 1;
654         }
655         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
656
657         /* ulpTimeout is only one byte */
658         if (lpfc_cmd->timeout > 0xff) {
659                 /*
660                  * Do not timeout the command at the firmware level.
661                  * The driver will provide the timeout mechanism.
662                  */
663                 piocb->ulpTimeout = 0;
664         } else {
665                 piocb->ulpTimeout = lpfc_cmd->timeout;
666         }
667
668         lpfc_cmd->rdata = rdata;
669
670         switch (task_mgmt_cmd) {
671         case FCP_LUN_RESET:
672                 /* Issue LUN Reset to TGT <num> LUN <num> */
673                 lpfc_printf_log(phba,
674                                 KERN_INFO,
675                                 LOG_FCP,
676                                 "%d:0703 Issue LUN Reset to TGT %d LUN %d "
677                                 "Data: x%x x%x\n",
678                                 phba->brd_no,
679                                 scsi_dev->id, scsi_dev->lun,
680                                 ndlp->nlp_rpi, ndlp->nlp_flag);
681
682                 break;
683         case FCP_ABORT_TASK_SET:
684                 /* Issue Abort Task Set to TGT <num> LUN <num> */
685                 lpfc_printf_log(phba,
686                                 KERN_INFO,
687                                 LOG_FCP,
688                                 "%d:0701 Issue Abort Task Set to TGT %d LUN %d "
689                                 "Data: x%x x%x\n",
690                                 phba->brd_no,
691                                 scsi_dev->id, scsi_dev->lun,
692                                 ndlp->nlp_rpi, ndlp->nlp_flag);
693
694                 break;
695         case FCP_TARGET_RESET:
696                 /* Issue Target Reset to TGT <num> */
697                 lpfc_printf_log(phba,
698                                 KERN_INFO,
699                                 LOG_FCP,
700                                 "%d:0702 Issue Target Reset to TGT %d "
701                                 "Data: x%x x%x\n",
702                                 phba->brd_no,
703                                 scsi_dev->id, ndlp->nlp_rpi,
704                                 ndlp->nlp_flag);
705                 break;
706         }
707
708         return (1);
709 }
710
711 static int
712 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf * lpfc_cmd, struct lpfc_hba * phba)
713 {
714         struct lpfc_iocbq *iocbq;
715         struct lpfc_iocbq *iocbqrsp;
716         int ret;
717
718         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_TARGET_RESET);
719         if (!ret)
720                 return FAILED;
721
722         lpfc_cmd->scsi_hba = phba;
723         iocbq = &lpfc_cmd->cur_iocbq;
724         iocbqrsp = lpfc_sli_get_iocbq(phba);
725
726         if (!iocbqrsp)
727                 return FAILED;
728
729         ret = lpfc_sli_issue_iocb_wait(phba,
730                                        &phba->sli.ring[phba->sli.fcp_ring],
731                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
732         if (ret != IOCB_SUCCESS) {
733                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
734                 ret = FAILED;
735         } else {
736                 ret = SUCCESS;
737                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
738                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
739                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
740                         (lpfc_cmd->result & IOERR_DRVR_MASK))
741                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
742         }
743
744         lpfc_sli_release_iocbq(phba, iocbqrsp);
745         return ret;
746 }
747
748 const char *
749 lpfc_info(struct Scsi_Host *host)
750 {
751         struct lpfc_hba    *phba = (struct lpfc_hba *) host->hostdata;
752         int len;
753         static char  lpfcinfobuf[384];
754
755         memset(lpfcinfobuf,0,384);
756         if (phba && phba->pcidev){
757                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
758                 len = strlen(lpfcinfobuf);
759                 snprintf(lpfcinfobuf + len,
760                         384-len,
761                         " on PCI bus %02x device %02x irq %d",
762                         phba->pcidev->bus->number,
763                         phba->pcidev->devfn,
764                         phba->pcidev->irq);
765                 len = strlen(lpfcinfobuf);
766                 if (phba->Port[0]) {
767                         snprintf(lpfcinfobuf + len,
768                                  384-len,
769                                  " port %s",
770                                  phba->Port);
771                 }
772         }
773         return lpfcinfobuf;
774 }
775
776 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
777 {
778         unsigned long  poll_tmo_expires =
779                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
780
781         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
782                 mod_timer(&phba->fcp_poll_timer,
783                           poll_tmo_expires);
784 }
785
786 void lpfc_poll_start_timer(struct lpfc_hba * phba)
787 {
788         lpfc_poll_rearm_timer(phba);
789 }
790
791 void lpfc_poll_timeout(unsigned long ptr)
792 {
793         struct lpfc_hba *phba = (struct lpfc_hba *)ptr;
794         unsigned long iflag;
795
796         spin_lock_irqsave(phba->host->host_lock, iflag);
797
798         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
799                 lpfc_sli_poll_fcp_ring (phba);
800                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
801                         lpfc_poll_rearm_timer(phba);
802         }
803
804         spin_unlock_irqrestore(phba->host->host_lock, iflag);
805 }
806
807 static int
808 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
809 {
810         struct lpfc_hba *phba =
811                 (struct lpfc_hba *) cmnd->device->host->hostdata;
812         struct lpfc_sli *psli = &phba->sli;
813         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
814         struct lpfc_nodelist *ndlp = rdata->pnode;
815         struct lpfc_scsi_buf *lpfc_cmd;
816         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
817         int err;
818
819         err = fc_remote_port_chkready(rport);
820         if (err) {
821                 cmnd->result = err;
822                 goto out_fail_command;
823         }
824
825         /*
826          * Catch race where our node has transitioned, but the
827          * transport is still transitioning.
828          */
829         if (!ndlp) {
830                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
831                 goto out_fail_command;
832         }
833         lpfc_cmd = lpfc_get_scsi_buf (phba);
834         if (lpfc_cmd == NULL) {
835                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
836                                 "%d:0707 driver's buffer pool is empty, "
837                                 "IO busied\n", phba->brd_no);
838                 goto out_host_busy;
839         }
840
841         /*
842          * Store the midlayer's command structure for the completion phase
843          * and complete the command initialization.
844          */
845         lpfc_cmd->pCmd  = cmnd;
846         lpfc_cmd->rdata = rdata;
847         lpfc_cmd->timeout = 0;
848         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
849         cmnd->scsi_done = done;
850
851         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
852         if (err)
853                 goto out_host_busy_free_buf;
854
855         lpfc_scsi_prep_cmnd(phba, lpfc_cmd, ndlp);
856
857         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
858                                 &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
859         if (err)
860                 goto out_host_busy_free_buf;
861
862         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
863                 lpfc_sli_poll_fcp_ring(phba);
864                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
865                         lpfc_poll_rearm_timer(phba);
866         }
867
868         return 0;
869
870  out_host_busy_free_buf:
871         lpfc_release_scsi_buf(phba, lpfc_cmd);
872  out_host_busy:
873         return SCSI_MLQUEUE_HOST_BUSY;
874
875  out_fail_command:
876         done(cmnd);
877         return 0;
878 }
879
880
881 static int
882 lpfc_abort_handler(struct scsi_cmnd *cmnd)
883 {
884         struct Scsi_Host *shost = cmnd->device->host;
885         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
886         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
887         struct lpfc_iocbq *iocb;
888         struct lpfc_iocbq *abtsiocb;
889         struct lpfc_scsi_buf *lpfc_cmd;
890         IOCB_t *cmd, *icmd;
891         unsigned int loop_count = 0;
892         int ret = SUCCESS;
893
894         lpfc_block_requests(phba);
895         spin_lock_irq(shost->host_lock);
896
897         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
898         BUG_ON(!lpfc_cmd);
899
900         /*
901          * If pCmd field of the corresponding lpfc_scsi_buf structure
902          * points to a different SCSI command, then the driver has
903          * already completed this command, but the midlayer did not
904          * see the completion before the eh fired.  Just return
905          * SUCCESS.
906          */
907         iocb = &lpfc_cmd->cur_iocbq;
908         if (lpfc_cmd->pCmd != cmnd)
909                 goto out;
910
911         BUG_ON(iocb->context1 != lpfc_cmd);
912
913         abtsiocb = lpfc_sli_get_iocbq(phba);
914         if (abtsiocb == NULL) {
915                 ret = FAILED;
916                 goto out;
917         }
918
919         /*
920          * The scsi command can not be in txq and it is in flight because the
921          * pCmd is still pointig at the SCSI command we have to abort. There
922          * is no need to search the txcmplq. Just send an abort to the FW.
923          */
924
925         cmd = &iocb->iocb;
926         icmd = &abtsiocb->iocb;
927         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
928         icmd->un.acxri.abortContextTag = cmd->ulpContext;
929         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
930
931         icmd->ulpLe = 1;
932         icmd->ulpClass = cmd->ulpClass;
933         if (phba->hba_state >= LPFC_LINK_UP)
934                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
935         else
936                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
937
938         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
939         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
940                 lpfc_sli_release_iocbq(phba, abtsiocb);
941                 ret = FAILED;
942                 goto out;
943         }
944
945         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
946                 lpfc_sli_poll_fcp_ring (phba);
947
948         /* Wait for abort to complete */
949         while (lpfc_cmd->pCmd == cmnd)
950         {
951                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
952                         lpfc_sli_poll_fcp_ring (phba);
953
954                 spin_unlock_irq(phba->host->host_lock);
955                         schedule_timeout_uninterruptible(LPFC_ABORT_WAIT*HZ);
956                 spin_lock_irq(phba->host->host_lock);
957                 if (++loop_count
958                     > (2 * phba->cfg_nodev_tmo)/LPFC_ABORT_WAIT)
959                         break;
960         }
961
962         if (lpfc_cmd->pCmd == cmnd) {
963                 ret = FAILED;
964                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
965                                 "%d:0748 abort handler timed out waiting for "
966                                 "abort to complete: ret %#x, ID %d, LUN %d, "
967                                 "snum %#lx\n",
968                                 phba->brd_no,  ret, cmnd->device->id,
969                                 cmnd->device->lun, cmnd->serial_number);
970         }
971
972  out:
973         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
974                         "%d:0749 SCSI Layer I/O Abort Request "
975                         "Status x%x ID %d LUN %d snum %#lx\n",
976                         phba->brd_no, ret, cmnd->device->id,
977                         cmnd->device->lun, cmnd->serial_number);
978
979         spin_unlock_irq(shost->host_lock);
980         lpfc_unblock_requests(phba);
981
982         return ret;
983 }
984
985 static int
986 lpfc_reset_lun_handler(struct scsi_cmnd *cmnd)
987 {
988         struct Scsi_Host *shost = cmnd->device->host;
989         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
990         struct lpfc_scsi_buf *lpfc_cmd;
991         struct lpfc_iocbq *iocbq, *iocbqrsp;
992         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
993         struct lpfc_nodelist *pnode = rdata->pnode;
994         uint32_t cmd_result = 0, cmd_status = 0;
995         int ret = FAILED;
996         int cnt, loopcnt;
997
998         lpfc_block_requests(phba);
999         spin_lock_irq(shost->host_lock);
1000         /*
1001          * If target is not in a MAPPED state, delay the reset until
1002          * target is rediscovered or nodev timeout expires.
1003          */
1004         while ( 1 ) {
1005                 if (!pnode)
1006                         break;
1007
1008                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
1009                         spin_unlock_irq(phba->host->host_lock);
1010                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
1011                         spin_lock_irq(phba->host->host_lock);
1012                 }
1013                 if ((pnode) && (pnode->nlp_state == NLP_STE_MAPPED_NODE))
1014                         break;
1015         }
1016
1017         lpfc_cmd = lpfc_get_scsi_buf (phba);
1018         if (lpfc_cmd == NULL)
1019                 goto out;
1020
1021         lpfc_cmd->pCmd = cmnd;
1022         lpfc_cmd->timeout = 60;
1023         lpfc_cmd->scsi_hba = phba;
1024
1025         ret = lpfc_scsi_prep_task_mgmt_cmd(phba, lpfc_cmd, FCP_LUN_RESET);
1026         if (!ret)
1027                 goto out_free_scsi_buf;
1028
1029         iocbq = &lpfc_cmd->cur_iocbq;
1030
1031         /* get a buffer for this IOCB command response */
1032         iocbqrsp = lpfc_sli_get_iocbq(phba);
1033         if (iocbqrsp == NULL)
1034                 goto out_free_scsi_buf;
1035
1036         ret = lpfc_sli_issue_iocb_wait(phba,
1037                                        &phba->sli.ring[phba->sli.fcp_ring],
1038                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
1039         if (ret == IOCB_SUCCESS)
1040                 ret = SUCCESS;
1041
1042
1043         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
1044         cmd_status = iocbqrsp->iocb.ulpStatus;
1045
1046         lpfc_sli_release_iocbq(phba, iocbqrsp);
1047         lpfc_release_scsi_buf(phba, lpfc_cmd);
1048
1049         /*
1050          * All outstanding txcmplq I/Os should have been aborted by the device.
1051          * Unfortunately, some targets do not abide by this forcing the driver
1052          * to double check.
1053          */
1054         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1055                                 cmnd->device->id, cmnd->device->lun,
1056                                 LPFC_CTX_LUN);
1057         if (cnt)
1058                 lpfc_sli_abort_iocb(phba,
1059                                     &phba->sli.ring[phba->sli.fcp_ring],
1060                                     cmnd->device->id, cmnd->device->lun,
1061                                     0, LPFC_CTX_LUN);
1062         loopcnt = 0;
1063         while(cnt) {
1064                 spin_unlock_irq(phba->host->host_lock);
1065                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1066                 spin_lock_irq(phba->host->host_lock);
1067
1068                 if (++loopcnt
1069                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1070                         break;
1071
1072                 cnt = lpfc_sli_sum_iocb(phba,
1073                                         &phba->sli.ring[phba->sli.fcp_ring],
1074                                         cmnd->device->id, cmnd->device->lun,
1075                                         LPFC_CTX_LUN);
1076         }
1077
1078         if (cnt) {
1079                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1080                         "%d:0719 LUN Reset I/O flush failure: cnt x%x\n",
1081                         phba->brd_no, cnt);
1082                 ret = FAILED;
1083         }
1084
1085 out_free_scsi_buf:
1086         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1087                         "%d:0713 SCSI layer issued LUN reset (%d, %d) "
1088                         "Data: x%x x%x x%x\n",
1089                         phba->brd_no, cmnd->device->id,cmnd->device->lun,
1090                         ret, cmd_status, cmd_result);
1091
1092 out:
1093         spin_unlock_irq(shost->host_lock);
1094         lpfc_unblock_requests(phba);
1095         return ret;
1096 }
1097
1098 static int
1099 lpfc_reset_bus_handler(struct scsi_cmnd *cmnd)
1100 {
1101         struct Scsi_Host *shost = cmnd->device->host;
1102         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
1103         struct lpfc_nodelist *ndlp = NULL;
1104         int match;
1105         int ret = FAILED, i, err_count = 0;
1106         int cnt, loopcnt;
1107         unsigned int midlayer_id = 0;
1108         struct lpfc_scsi_buf * lpfc_cmd;
1109
1110         lpfc_block_requests(phba);
1111         spin_lock_irq(shost->host_lock);
1112
1113         lpfc_cmd = lpfc_get_scsi_buf(phba);
1114         if (lpfc_cmd == NULL)
1115                 goto out;
1116
1117         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1118         lpfc_cmd->timeout = 60;
1119         lpfc_cmd->pCmd = cmnd;
1120         lpfc_cmd->scsi_hba = phba;
1121
1122         /*
1123          * Since the driver manages a single bus device, reset all
1124          * targets known to the driver.  Should any target reset
1125          * fail, this routine returns failure to the midlayer.
1126          */
1127         midlayer_id = cmnd->device->id;
1128         for (i = 0; i < MAX_FCP_TARGET; i++) {
1129                 /* Search the mapped list for this target ID */
1130                 match = 0;
1131                 list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
1132                         if ((i == ndlp->nlp_sid) && ndlp->rport) {
1133                                 match = 1;
1134                                 break;
1135                         }
1136                 }
1137                 if (!match)
1138                         continue;
1139
1140                 lpfc_cmd->pCmd->device->id = i;
1141                 lpfc_cmd->pCmd->device->hostdata = ndlp->rport->dd_data;
1142                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, phba);
1143                 if (ret != SUCCESS) {
1144                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1145                                 "%d:0713 Bus Reset on target %d failed\n",
1146                                 phba->brd_no, i);
1147                         err_count++;
1148                 }
1149         }
1150
1151         if (err_count == 0)
1152                 ret = SUCCESS;
1153
1154         lpfc_release_scsi_buf(phba, lpfc_cmd);
1155
1156         /*
1157          * All outstanding txcmplq I/Os should have been aborted by
1158          * the targets.  Unfortunately, some targets do not abide by
1159          * this forcing the driver to double check.
1160          */
1161         cmnd->device->id = midlayer_id;
1162         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1163                                 0, 0, LPFC_CTX_HOST);
1164         if (cnt)
1165                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1166                                     0, 0, 0, LPFC_CTX_HOST);
1167         loopcnt = 0;
1168         while(cnt) {
1169                 spin_unlock_irq(phba->host->host_lock);
1170                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1171                 spin_lock_irq(phba->host->host_lock);
1172
1173                 if (++loopcnt
1174                     > (2 * phba->cfg_nodev_tmo)/LPFC_RESET_WAIT)
1175                         break;
1176
1177                 cnt = lpfc_sli_sum_iocb(phba,
1178                                         &phba->sli.ring[phba->sli.fcp_ring],
1179                                         0, 0, LPFC_CTX_HOST);
1180         }
1181
1182         if (cnt) {
1183                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1184                    "%d:0715 Bus Reset I/O flush failure: cnt x%x left x%x\n",
1185                    phba->brd_no, cnt, i);
1186                 ret = FAILED;
1187         }
1188
1189         lpfc_printf_log(phba,
1190                         KERN_ERR,
1191                         LOG_FCP,
1192                         "%d:0714 SCSI layer issued Bus Reset Data: x%x\n",
1193                         phba->brd_no, ret);
1194 out:
1195         spin_unlock_irq(shost->host_lock);
1196         lpfc_unblock_requests(phba);
1197         return ret;
1198 }
1199
1200 static int
1201 lpfc_slave_alloc(struct scsi_device *sdev)
1202 {
1203         struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata;
1204         struct lpfc_scsi_buf *scsi_buf = NULL;
1205         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1206         uint32_t total = 0, i;
1207         uint32_t num_to_alloc = 0;
1208         unsigned long flags;
1209
1210         if (!rport || fc_remote_port_chkready(rport))
1211                 return -ENXIO;
1212
1213         sdev->hostdata = rport->dd_data;
1214
1215         /*
1216          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1217          * available list of scsi buffers.  Don't allocate more than the
1218          * HBA limit conveyed to the midlayer via the host structure.  The
1219          * formula accounts for the lun_queue_depth + error handlers + 1
1220          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1221          */
1222         total = phba->total_scsi_bufs;
1223         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1224         if (total >= phba->cfg_hba_queue_depth) {
1225                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1226                                 "%d:0704 At limitation of %d preallocated "
1227                                 "command buffers\n", phba->brd_no, total);
1228                 return 0;
1229         } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) {
1230                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1231                                 "%d:0705 Allocation request of %d command "
1232                                 "buffers will exceed max of %d.  Reducing "
1233                                 "allocation request to %d.\n", phba->brd_no,
1234                                 num_to_alloc, phba->cfg_hba_queue_depth,
1235                                 (phba->cfg_hba_queue_depth - total));
1236                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1237         }
1238
1239         for (i = 0; i < num_to_alloc; i++) {
1240                 scsi_buf = lpfc_new_scsi_buf(phba);
1241                 if (!scsi_buf) {
1242                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1243                                         "%d:0706 Failed to allocate command "
1244                                         "buffer\n", phba->brd_no);
1245                         break;
1246                 }
1247
1248                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1249                 phba->total_scsi_bufs++;
1250                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1251                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1252         }
1253         return 0;
1254 }
1255
1256 static int
1257 lpfc_slave_configure(struct scsi_device *sdev)
1258 {
1259         struct lpfc_hba *phba = (struct lpfc_hba *) sdev->host->hostdata;
1260         struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
1261
1262         if (sdev->tagged_supported)
1263                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1264         else
1265                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1266
1267         /*
1268          * Initialize the fc transport attributes for the target
1269          * containing this scsi device.  Also note that the driver's
1270          * target pointer is stored in the starget_data for the
1271          * driver's sysfs entry point functions.
1272          */
1273         rport->dev_loss_tmo = phba->cfg_nodev_tmo + 5;
1274
1275         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1276                 lpfc_sli_poll_fcp_ring(phba);
1277                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1278                         lpfc_poll_rearm_timer(phba);
1279         }
1280
1281         return 0;
1282 }
1283
1284 static void
1285 lpfc_slave_destroy(struct scsi_device *sdev)
1286 {
1287         sdev->hostdata = NULL;
1288         return;
1289 }
1290
1291 struct scsi_host_template lpfc_template = {
1292         .module                 = THIS_MODULE,
1293         .name                   = LPFC_DRIVER_NAME,
1294         .info                   = lpfc_info,
1295         .queuecommand           = lpfc_queuecommand,
1296         .eh_abort_handler       = lpfc_abort_handler,
1297         .eh_device_reset_handler= lpfc_reset_lun_handler,
1298         .eh_bus_reset_handler   = lpfc_reset_bus_handler,
1299         .slave_alloc            = lpfc_slave_alloc,
1300         .slave_configure        = lpfc_slave_configure,
1301         .slave_destroy          = lpfc_slave_destroy,
1302         .this_id                = -1,
1303         .sg_tablesize           = LPFC_SG_SEG_CNT,
1304         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1305         .use_clustering         = ENABLE_CLUSTERING,
1306         .shost_attrs            = lpfc_host_attrs,
1307         .max_sectors            = 0xFFFF,
1308 };