Merge branch 'for-2.6.30' into for-2.6.31
[linux-2.6] / drivers / scsi / qla2xxx / qla_iocb.c
1 /*
2  * QLogic Fibre Channel HBA Driver
3  * Copyright (c)  2003-2008 QLogic Corporation
4  *
5  * See LICENSE.qla2xxx for copyright and licensing details.
6  */
7 #include "qla_def.h"
8
9 #include <linux/blkdev.h>
10 #include <linux/delay.h>
11
12 #include <scsi/scsi_tcq.h>
13
14 static request_t *qla2x00_req_pkt(struct scsi_qla_host *, struct req_que *,
15                                                         struct rsp_que *rsp);
16 static void qla2x00_isp_cmd(struct scsi_qla_host *, struct req_que *);
17
18 /**
19  * qla2x00_get_cmd_direction() - Determine control_flag data direction.
20  * @cmd: SCSI command
21  *
22  * Returns the proper CF_* direction based on CDB.
23  */
24 static inline uint16_t
25 qla2x00_get_cmd_direction(srb_t *sp)
26 {
27         uint16_t cflags;
28
29         cflags = 0;
30
31         /* Set transfer direction */
32         if (sp->cmd->sc_data_direction == DMA_TO_DEVICE) {
33                 cflags = CF_WRITE;
34                 sp->fcport->vha->hw->qla_stats.output_bytes +=
35                     scsi_bufflen(sp->cmd);
36         } else if (sp->cmd->sc_data_direction == DMA_FROM_DEVICE) {
37                 cflags = CF_READ;
38                 sp->fcport->vha->hw->qla_stats.input_bytes +=
39                     scsi_bufflen(sp->cmd);
40         }
41         return (cflags);
42 }
43
44 /**
45  * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
46  * Continuation Type 0 IOCBs to allocate.
47  *
48  * @dsds: number of data segment decriptors needed
49  *
50  * Returns the number of IOCB entries needed to store @dsds.
51  */
52 uint16_t
53 qla2x00_calc_iocbs_32(uint16_t dsds)
54 {
55         uint16_t iocbs;
56
57         iocbs = 1;
58         if (dsds > 3) {
59                 iocbs += (dsds - 3) / 7;
60                 if ((dsds - 3) % 7)
61                         iocbs++;
62         }
63         return (iocbs);
64 }
65
66 /**
67  * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
68  * Continuation Type 1 IOCBs to allocate.
69  *
70  * @dsds: number of data segment decriptors needed
71  *
72  * Returns the number of IOCB entries needed to store @dsds.
73  */
74 uint16_t
75 qla2x00_calc_iocbs_64(uint16_t dsds)
76 {
77         uint16_t iocbs;
78
79         iocbs = 1;
80         if (dsds > 2) {
81                 iocbs += (dsds - 2) / 5;
82                 if ((dsds - 2) % 5)
83                         iocbs++;
84         }
85         return (iocbs);
86 }
87
88 /**
89  * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
90  * @ha: HA context
91  *
92  * Returns a pointer to the Continuation Type 0 IOCB packet.
93  */
94 static inline cont_entry_t *
95 qla2x00_prep_cont_type0_iocb(struct req_que *req, struct scsi_qla_host *vha)
96 {
97         cont_entry_t *cont_pkt;
98         /* Adjust ring index. */
99         req->ring_index++;
100         if (req->ring_index == req->length) {
101                 req->ring_index = 0;
102                 req->ring_ptr = req->ring;
103         } else {
104                 req->ring_ptr++;
105         }
106
107         cont_pkt = (cont_entry_t *)req->ring_ptr;
108
109         /* Load packet defaults. */
110         *((uint32_t *)(&cont_pkt->entry_type)) =
111             __constant_cpu_to_le32(CONTINUE_TYPE);
112
113         return (cont_pkt);
114 }
115
116 /**
117  * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
118  * @ha: HA context
119  *
120  * Returns a pointer to the continuation type 1 IOCB packet.
121  */
122 static inline cont_a64_entry_t *
123 qla2x00_prep_cont_type1_iocb(struct req_que *req, scsi_qla_host_t *vha)
124 {
125         cont_a64_entry_t *cont_pkt;
126
127         /* Adjust ring index. */
128         req->ring_index++;
129         if (req->ring_index == req->length) {
130                 req->ring_index = 0;
131                 req->ring_ptr = req->ring;
132         } else {
133                 req->ring_ptr++;
134         }
135
136         cont_pkt = (cont_a64_entry_t *)req->ring_ptr;
137
138         /* Load packet defaults. */
139         *((uint32_t *)(&cont_pkt->entry_type)) =
140             __constant_cpu_to_le32(CONTINUE_A64_TYPE);
141
142         return (cont_pkt);
143 }
144
145 /**
146  * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
147  * capable IOCB types.
148  *
149  * @sp: SRB command to process
150  * @cmd_pkt: Command type 2 IOCB
151  * @tot_dsds: Total number of segments to transfer
152  */
153 void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
154     uint16_t tot_dsds)
155 {
156         uint16_t        avail_dsds;
157         uint32_t        *cur_dsd;
158         scsi_qla_host_t *vha;
159         struct scsi_cmnd *cmd;
160         struct scatterlist *sg;
161         int i;
162         struct req_que *req;
163
164         cmd = sp->cmd;
165
166         /* Update entry type to indicate Command Type 2 IOCB */
167         *((uint32_t *)(&cmd_pkt->entry_type)) =
168             __constant_cpu_to_le32(COMMAND_TYPE);
169
170         /* No data transfer */
171         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
172                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
173                 return;
174         }
175
176         vha = sp->fcport->vha;
177         req = sp->que;
178
179         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(sp));
180
181         /* Three DSDs are available in the Command Type 2 IOCB */
182         avail_dsds = 3;
183         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
184
185         /* Load data segments */
186         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
187                 cont_entry_t *cont_pkt;
188
189                 /* Allocate additional continuation packets? */
190                 if (avail_dsds == 0) {
191                         /*
192                          * Seven DSDs are available in the Continuation
193                          * Type 0 IOCB.
194                          */
195                         cont_pkt = qla2x00_prep_cont_type0_iocb(req, vha);
196                         cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
197                         avail_dsds = 7;
198                 }
199
200                 *cur_dsd++ = cpu_to_le32(sg_dma_address(sg));
201                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
202                 avail_dsds--;
203         }
204 }
205
206 /**
207  * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
208  * capable IOCB types.
209  *
210  * @sp: SRB command to process
211  * @cmd_pkt: Command type 3 IOCB
212  * @tot_dsds: Total number of segments to transfer
213  */
214 void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
215     uint16_t tot_dsds)
216 {
217         uint16_t        avail_dsds;
218         uint32_t        *cur_dsd;
219         scsi_qla_host_t *vha;
220         struct scsi_cmnd *cmd;
221         struct scatterlist *sg;
222         int i;
223         struct req_que *req;
224
225         cmd = sp->cmd;
226
227         /* Update entry type to indicate Command Type 3 IOCB */
228         *((uint32_t *)(&cmd_pkt->entry_type)) =
229             __constant_cpu_to_le32(COMMAND_A64_TYPE);
230
231         /* No data transfer */
232         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
233                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
234                 return;
235         }
236
237         vha = sp->fcport->vha;
238         req = sp->que;
239
240         cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(sp));
241
242         /* Two DSDs are available in the Command Type 3 IOCB */
243         avail_dsds = 2;
244         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
245
246         /* Load data segments */
247         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
248                 dma_addr_t      sle_dma;
249                 cont_a64_entry_t *cont_pkt;
250
251                 /* Allocate additional continuation packets? */
252                 if (avail_dsds == 0) {
253                         /*
254                          * Five DSDs are available in the Continuation
255                          * Type 1 IOCB.
256                          */
257                         cont_pkt = qla2x00_prep_cont_type1_iocb(req, vha);
258                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
259                         avail_dsds = 5;
260                 }
261
262                 sle_dma = sg_dma_address(sg);
263                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
264                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
265                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
266                 avail_dsds--;
267         }
268 }
269
270 /**
271  * qla2x00_start_scsi() - Send a SCSI command to the ISP
272  * @sp: command to send to the ISP
273  *
274  * Returns non-zero if a failure occurred, else zero.
275  */
276 int
277 qla2x00_start_scsi(srb_t *sp)
278 {
279         int             ret, nseg;
280         unsigned long   flags;
281         scsi_qla_host_t *vha;
282         struct scsi_cmnd *cmd;
283         uint32_t        *clr_ptr;
284         uint32_t        index;
285         uint32_t        handle;
286         cmd_entry_t     *cmd_pkt;
287         uint16_t        cnt;
288         uint16_t        req_cnt;
289         uint16_t        tot_dsds;
290         struct device_reg_2xxx __iomem *reg;
291         struct qla_hw_data *ha;
292         struct req_que *req;
293         struct rsp_que *rsp;
294
295         /* Setup device pointers. */
296         ret = 0;
297         vha = sp->fcport->vha;
298         ha = vha->hw;
299         reg = &ha->iobase->isp;
300         cmd = sp->cmd;
301         req = ha->req_q_map[0];
302         rsp = ha->rsp_q_map[0];
303         /* So we know we haven't pci_map'ed anything yet */
304         tot_dsds = 0;
305
306         /* Send marker if required */
307         if (vha->marker_needed != 0) {
308                 if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL)
309                                                         != QLA_SUCCESS)
310                         return (QLA_FUNCTION_FAILED);
311                 vha->marker_needed = 0;
312         }
313
314         /* Acquire ring specific lock */
315         spin_lock_irqsave(&ha->hardware_lock, flags);
316
317         /* Check for room in outstanding command list. */
318         handle = req->current_outstanding_cmd;
319         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
320                 handle++;
321                 if (handle == MAX_OUTSTANDING_COMMANDS)
322                         handle = 1;
323                 if (!req->outstanding_cmds[handle])
324                         break;
325         }
326         if (index == MAX_OUTSTANDING_COMMANDS)
327                 goto queuing_error;
328
329         /* Map the sg table so we have an accurate count of sg entries needed */
330         if (scsi_sg_count(cmd)) {
331                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
332                     scsi_sg_count(cmd), cmd->sc_data_direction);
333                 if (unlikely(!nseg))
334                         goto queuing_error;
335         } else
336                 nseg = 0;
337
338         tot_dsds = nseg;
339
340         /* Calculate the number of request entries needed. */
341         req_cnt = ha->isp_ops->calc_req_entries(tot_dsds);
342         if (req->cnt < (req_cnt + 2)) {
343                 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
344                 if (req->ring_index < cnt)
345                         req->cnt = cnt - req->ring_index;
346                 else
347                         req->cnt = req->length -
348                             (req->ring_index - cnt);
349         }
350         if (req->cnt < (req_cnt + 2))
351                 goto queuing_error;
352
353         /* Build command packet */
354         req->current_outstanding_cmd = handle;
355         req->outstanding_cmds[handle] = sp;
356         sp->que = req;
357         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
358         req->cnt -= req_cnt;
359
360         cmd_pkt = (cmd_entry_t *)req->ring_ptr;
361         cmd_pkt->handle = handle;
362         /* Zero out remaining portion of packet. */
363         clr_ptr = (uint32_t *)cmd_pkt + 2;
364         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
365         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
366
367         /* Set target ID and LUN number*/
368         SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
369         cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
370
371         /* Update tagged queuing modifier */
372         cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
373
374         /* Load SCSI command packet. */
375         memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
376         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
377
378         /* Build IOCB segments */
379         ha->isp_ops->build_iocbs(sp, cmd_pkt, tot_dsds);
380
381         /* Set total data segment count. */
382         cmd_pkt->entry_count = (uint8_t)req_cnt;
383         wmb();
384
385         /* Adjust ring index. */
386         req->ring_index++;
387         if (req->ring_index == req->length) {
388                 req->ring_index = 0;
389                 req->ring_ptr = req->ring;
390         } else
391                 req->ring_ptr++;
392
393         sp->flags |= SRB_DMA_VALID;
394
395         /* Set chip new ring index. */
396         WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), req->ring_index);
397         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg));     /* PCI Posting. */
398
399         /* Manage unprocessed RIO/ZIO commands in response queue. */
400         if (vha->flags.process_response_queue &&
401             rsp->ring_ptr->signature != RESPONSE_PROCESSED)
402                 qla2x00_process_response_queue(rsp);
403
404         spin_unlock_irqrestore(&ha->hardware_lock, flags);
405         return (QLA_SUCCESS);
406
407 queuing_error:
408         if (tot_dsds)
409                 scsi_dma_unmap(cmd);
410
411         spin_unlock_irqrestore(&ha->hardware_lock, flags);
412
413         return (QLA_FUNCTION_FAILED);
414 }
415
416 /**
417  * qla2x00_marker() - Send a marker IOCB to the firmware.
418  * @ha: HA context
419  * @loop_id: loop ID
420  * @lun: LUN
421  * @type: marker modifier
422  *
423  * Can be called from both normal and interrupt context.
424  *
425  * Returns non-zero if a failure occurred, else zero.
426  */
427 int
428 __qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
429                         struct rsp_que *rsp, uint16_t loop_id,
430                         uint16_t lun, uint8_t type)
431 {
432         mrk_entry_t *mrk;
433         struct mrk_entry_24xx *mrk24;
434         struct qla_hw_data *ha = vha->hw;
435         scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
436
437         mrk24 = NULL;
438         mrk = (mrk_entry_t *)qla2x00_req_pkt(vha, req, rsp);
439         if (mrk == NULL) {
440                 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
441                     __func__, base_vha->host_no));
442
443                 return (QLA_FUNCTION_FAILED);
444         }
445
446         mrk->entry_type = MARKER_TYPE;
447         mrk->modifier = type;
448         if (type != MK_SYNC_ALL) {
449                 if (IS_FWI2_CAPABLE(ha)) {
450                         mrk24 = (struct mrk_entry_24xx *) mrk;
451                         mrk24->nport_handle = cpu_to_le16(loop_id);
452                         mrk24->lun[1] = LSB(lun);
453                         mrk24->lun[2] = MSB(lun);
454                         host_to_fcp_swap(mrk24->lun, sizeof(mrk24->lun));
455                         mrk24->vp_index = vha->vp_idx;
456                 } else {
457                         SET_TARGET_ID(ha, mrk->target, loop_id);
458                         mrk->lun = cpu_to_le16(lun);
459                 }
460         }
461         wmb();
462
463         qla2x00_isp_cmd(vha, req);
464
465         return (QLA_SUCCESS);
466 }
467
468 int
469 qla2x00_marker(struct scsi_qla_host *vha, struct req_que *req,
470                 struct rsp_que *rsp, uint16_t loop_id, uint16_t lun,
471                 uint8_t type)
472 {
473         int ret;
474         unsigned long flags = 0;
475
476         spin_lock_irqsave(&vha->hw->hardware_lock, flags);
477         ret = __qla2x00_marker(vha, req, rsp, loop_id, lun, type);
478         spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
479
480         return (ret);
481 }
482
483 /**
484  * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
485  * @ha: HA context
486  *
487  * Note: The caller must hold the hardware lock before calling this routine.
488  *
489  * Returns NULL if function failed, else, a pointer to the request packet.
490  */
491 static request_t *
492 qla2x00_req_pkt(struct scsi_qla_host *vha, struct req_que *req,
493                 struct rsp_que *rsp)
494 {
495         struct qla_hw_data *ha = vha->hw;
496         device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);
497         request_t       *pkt = NULL;
498         uint16_t        cnt;
499         uint32_t        *dword_ptr;
500         uint32_t        timer;
501         uint16_t        req_cnt = 1;
502
503         /* Wait 1 second for slot. */
504         for (timer = HZ; timer; timer--) {
505                 if ((req_cnt + 2) >= req->cnt) {
506                         /* Calculate number of free request entries. */
507                         if (ha->mqenable)
508                                 cnt = (uint16_t)
509                                         RD_REG_DWORD(&reg->isp25mq.req_q_out);
510                         else {
511                                 if (IS_FWI2_CAPABLE(ha))
512                                         cnt = (uint16_t)RD_REG_DWORD(
513                                                 &reg->isp24.req_q_out);
514                                 else
515                                         cnt = qla2x00_debounce_register(
516                                                 ISP_REQ_Q_OUT(ha, &reg->isp));
517                         }
518                         if  (req->ring_index < cnt)
519                                 req->cnt = cnt - req->ring_index;
520                         else
521                                 req->cnt = req->length -
522                                     (req->ring_index - cnt);
523                 }
524                 /* If room for request in request ring. */
525                 if ((req_cnt + 2) < req->cnt) {
526                         req->cnt--;
527                         pkt = req->ring_ptr;
528
529                         /* Zero out packet. */
530                         dword_ptr = (uint32_t *)pkt;
531                         for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
532                                 *dword_ptr++ = 0;
533
534                         /* Set system defined field. */
535                         pkt->sys_define = (uint8_t)req->ring_index;
536
537                         /* Set entry count. */
538                         pkt->entry_count = 1;
539
540                         break;
541                 }
542
543                 /* Release ring specific lock */
544                 spin_unlock_irq(&ha->hardware_lock);
545
546                 udelay(2);   /* 2 us */
547
548                 /* Check for pending interrupts. */
549                 /* During init we issue marker directly */
550                 if (!vha->marker_needed && !vha->flags.init_done)
551                         qla2x00_poll(rsp);
552                 spin_lock_irq(&ha->hardware_lock);
553         }
554         if (!pkt) {
555                 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
556         }
557
558         return (pkt);
559 }
560
561 /**
562  * qla2x00_isp_cmd() - Modify the request ring pointer.
563  * @ha: HA context
564  *
565  * Note: The caller must hold the hardware lock before calling this routine.
566  */
567 static void
568 qla2x00_isp_cmd(struct scsi_qla_host *vha, struct req_que *req)
569 {
570         struct qla_hw_data *ha = vha->hw;
571         device_reg_t __iomem *reg = ISP_QUE_REG(ha, req->id);
572         struct device_reg_2xxx __iomem *ioreg = &ha->iobase->isp;
573
574         DEBUG5(printk("%s(): IOCB data:\n", __func__));
575         DEBUG5(qla2x00_dump_buffer(
576             (uint8_t *)req->ring_ptr, REQUEST_ENTRY_SIZE));
577
578         /* Adjust ring index. */
579         req->ring_index++;
580         if (req->ring_index == req->length) {
581                 req->ring_index = 0;
582                 req->ring_ptr = req->ring;
583         } else
584                 req->ring_ptr++;
585
586         /* Set chip new ring index. */
587         if (ha->mqenable) {
588                 WRT_REG_DWORD(&reg->isp25mq.req_q_in, req->ring_index);
589                 RD_REG_DWORD(&ioreg->hccr);
590         }
591         else {
592                 if (IS_FWI2_CAPABLE(ha)) {
593                         WRT_REG_DWORD(&reg->isp24.req_q_in, req->ring_index);
594                         RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
595                 } else {
596                         WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp),
597                                 req->ring_index);
598                         RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
599                 }
600         }
601
602 }
603
604 /**
605  * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
606  * Continuation Type 1 IOCBs to allocate.
607  *
608  * @dsds: number of data segment decriptors needed
609  *
610  * Returns the number of IOCB entries needed to store @dsds.
611  */
612 static inline uint16_t
613 qla24xx_calc_iocbs(uint16_t dsds)
614 {
615         uint16_t iocbs;
616
617         iocbs = 1;
618         if (dsds > 1) {
619                 iocbs += (dsds - 1) / 5;
620                 if ((dsds - 1) % 5)
621                         iocbs++;
622         }
623         return iocbs;
624 }
625
626 /**
627  * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
628  * IOCB types.
629  *
630  * @sp: SRB command to process
631  * @cmd_pkt: Command type 3 IOCB
632  * @tot_dsds: Total number of segments to transfer
633  */
634 static inline void
635 qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
636     uint16_t tot_dsds)
637 {
638         uint16_t        avail_dsds;
639         uint32_t        *cur_dsd;
640         scsi_qla_host_t *vha;
641         struct scsi_cmnd *cmd;
642         struct scatterlist *sg;
643         int i;
644         struct req_que *req;
645
646         cmd = sp->cmd;
647
648         /* Update entry type to indicate Command Type 3 IOCB */
649         *((uint32_t *)(&cmd_pkt->entry_type)) =
650             __constant_cpu_to_le32(COMMAND_TYPE_7);
651
652         /* No data transfer */
653         if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
654                 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
655                 return;
656         }
657
658         vha = sp->fcport->vha;
659         req = sp->que;
660
661         /* Set transfer direction */
662         if (cmd->sc_data_direction == DMA_TO_DEVICE) {
663                 cmd_pkt->task_mgmt_flags =
664                     __constant_cpu_to_le16(TMF_WRITE_DATA);
665                 sp->fcport->vha->hw->qla_stats.output_bytes +=
666                     scsi_bufflen(sp->cmd);
667         } else if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
668                 cmd_pkt->task_mgmt_flags =
669                     __constant_cpu_to_le16(TMF_READ_DATA);
670                 sp->fcport->vha->hw->qla_stats.input_bytes +=
671                     scsi_bufflen(sp->cmd);
672         }
673
674         /* One DSD is available in the Command Type 3 IOCB */
675         avail_dsds = 1;
676         cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
677
678         /* Load data segments */
679
680         scsi_for_each_sg(cmd, sg, tot_dsds, i) {
681                 dma_addr_t      sle_dma;
682                 cont_a64_entry_t *cont_pkt;
683
684                 /* Allocate additional continuation packets? */
685                 if (avail_dsds == 0) {
686                         /*
687                          * Five DSDs are available in the Continuation
688                          * Type 1 IOCB.
689                          */
690                         cont_pkt = qla2x00_prep_cont_type1_iocb(req, vha);
691                         cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
692                         avail_dsds = 5;
693                 }
694
695                 sle_dma = sg_dma_address(sg);
696                 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
697                 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
698                 *cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
699                 avail_dsds--;
700         }
701 }
702
703
704 /**
705  * qla24xx_start_scsi() - Send a SCSI command to the ISP
706  * @sp: command to send to the ISP
707  *
708  * Returns non-zero if a failure occurred, else zero.
709  */
710 int
711 qla24xx_start_scsi(srb_t *sp)
712 {
713         int             ret, nseg;
714         unsigned long   flags;
715         uint32_t        *clr_ptr;
716         uint32_t        index;
717         uint32_t        handle;
718         struct cmd_type_7 *cmd_pkt;
719         uint16_t        cnt;
720         uint16_t        req_cnt;
721         uint16_t        tot_dsds;
722         struct req_que *req = NULL;
723         struct rsp_que *rsp = NULL;
724         struct scsi_cmnd *cmd = sp->cmd;
725         struct scsi_qla_host *vha = sp->fcport->vha;
726         struct qla_hw_data *ha = vha->hw;
727         uint16_t que_id;
728
729         /* Setup device pointers. */
730         ret = 0;
731         que_id = vha->req_ques[0];
732
733         req = ha->req_q_map[que_id];
734         sp->que = req;
735
736         if (req->rsp)
737                 rsp = req->rsp;
738         else
739                 rsp = ha->rsp_q_map[que_id];
740         /* So we know we haven't pci_map'ed anything yet */
741         tot_dsds = 0;
742
743         /* Send marker if required */
744         if (vha->marker_needed != 0) {
745                 if (qla2x00_marker(vha, req, rsp, 0, 0, MK_SYNC_ALL)
746                                                         != QLA_SUCCESS)
747                         return QLA_FUNCTION_FAILED;
748                 vha->marker_needed = 0;
749         }
750
751         /* Acquire ring specific lock */
752         spin_lock_irqsave(&ha->hardware_lock, flags);
753
754         /* Check for room in outstanding command list. */
755         handle = req->current_outstanding_cmd;
756         for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
757                 handle++;
758                 if (handle == MAX_OUTSTANDING_COMMANDS)
759                         handle = 1;
760                 if (!req->outstanding_cmds[handle])
761                         break;
762         }
763         if (index == MAX_OUTSTANDING_COMMANDS)
764                 goto queuing_error;
765
766         /* Map the sg table so we have an accurate count of sg entries needed */
767         if (scsi_sg_count(cmd)) {
768                 nseg = dma_map_sg(&ha->pdev->dev, scsi_sglist(cmd),
769                     scsi_sg_count(cmd), cmd->sc_data_direction);
770                 if (unlikely(!nseg))
771                         goto queuing_error;
772         } else
773                 nseg = 0;
774
775         tot_dsds = nseg;
776
777         req_cnt = qla24xx_calc_iocbs(tot_dsds);
778         if (req->cnt < (req_cnt + 2)) {
779                 cnt = RD_REG_DWORD_RELAXED(req->req_q_out);
780
781                 if (req->ring_index < cnt)
782                         req->cnt = cnt - req->ring_index;
783                 else
784                         req->cnt = req->length -
785                                 (req->ring_index - cnt);
786         }
787         if (req->cnt < (req_cnt + 2))
788                 goto queuing_error;
789
790         /* Build command packet. */
791         req->current_outstanding_cmd = handle;
792         req->outstanding_cmds[handle] = sp;
793         sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
794         req->cnt -= req_cnt;
795
796         cmd_pkt = (struct cmd_type_7 *)req->ring_ptr;
797         cmd_pkt->handle = handle;
798
799         /* Zero out remaining portion of packet. */
800         /*    tagged queuing modifier -- default is TSK_SIMPLE (0). */
801         clr_ptr = (uint32_t *)cmd_pkt + 2;
802         memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
803         cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
804
805         /* Set NPORT-ID and LUN number*/
806         cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
807         cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
808         cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
809         cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
810         cmd_pkt->vp_index = sp->fcport->vp_idx;
811
812         int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
813         host_to_fcp_swap((uint8_t *)&cmd_pkt->lun, sizeof(cmd_pkt->lun));
814
815         /* Load SCSI command packet. */
816         memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
817         host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
818
819         cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
820
821         /* Build IOCB segments */
822         qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
823
824         /* Set total data segment count. */
825         cmd_pkt->entry_count = (uint8_t)req_cnt;
826         wmb();
827
828         /* Adjust ring index. */
829         req->ring_index++;
830         if (req->ring_index == req->length) {
831                 req->ring_index = 0;
832                 req->ring_ptr = req->ring;
833         } else
834                 req->ring_ptr++;
835
836         sp->flags |= SRB_DMA_VALID;
837
838         /* Set chip new ring index. */
839         WRT_REG_DWORD(req->req_q_in, req->ring_index);
840         RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
841
842         /* Manage unprocessed RIO/ZIO commands in response queue. */
843         if (vha->flags.process_response_queue &&
844                 rsp->ring_ptr->signature != RESPONSE_PROCESSED)
845                 qla24xx_process_response_queue(rsp);
846
847         spin_unlock_irqrestore(&ha->hardware_lock, flags);
848         return QLA_SUCCESS;
849
850 queuing_error:
851         if (tot_dsds)
852                 scsi_dma_unmap(cmd);
853
854         spin_unlock_irqrestore(&ha->hardware_lock, flags);
855
856         return QLA_FUNCTION_FAILED;
857 }