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[SCSI] qla2xxx: Refactor request/response-queue register handling.
[deliverable/linux.git] / 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 }
Linux kernel - Deliverables
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