Merge master.kernel.org:/home/rmk/linux-2.6-serial
[linux-2.6] / 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 };