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[SCSI] qla2xxx: Use midlayer's int_to_scsilun() function.
[linux-2.6-block.git] / drivers / scsi / qla2xxx / qla_iocb.c
CommitLineData
1da177e4
LT		 1/******************************************************************************
2 * QLOGIC LINUX SOFTWARE
3 *
4 * QLogic ISP2x00 device driver for Linux 2.6.x
ae91193c 5 * Copyright (C) 2003-2005 QLogic Corporation
1da177e4
LT		 6 * (www.qlogic.com)
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2, or (at your option) any
11 * later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 ******************************************************************************/
19
20#include "qla_def.h"
21
22#include <linux/blkdev.h>
23#include <linux/delay.h>
24
25#include <scsi/scsi_tcq.h>
26
27static inline uint16_t qla2x00_get_cmd_direction(struct scsi_cmnd *cmd);
28static inline cont_entry_t *qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *);
29static inline cont_a64_entry_t *qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *);
30static request_t *qla2x00_req_pkt(scsi_qla_host_t *ha);
31
32/**
33 * qla2x00_get_cmd_direction() - Determine control_flag data direction.
34 * @cmd: SCSI command
35 *
36 * Returns the proper CF_* direction based on CDB.
37 */
38static inline uint16_t
39qla2x00_get_cmd_direction(struct scsi_cmnd *cmd)
40{
41 uint16_t cflags;
42
43 cflags = 0;
44
45 /* Set transfer direction */
46 if (cmd->sc_data_direction == DMA_TO_DEVICE)
47 cflags = CF_WRITE;
48 else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
49 cflags = CF_READ;
50 return (cflags);
51}
52
53/**
54 * qla2x00_calc_iocbs_32() - Determine number of Command Type 2 and
55 * Continuation Type 0 IOCBs to allocate.
56 *
57 * @dsds: number of data segment decriptors needed
58 *
59 * Returns the number of IOCB entries needed to store @dsds.
60 */
61uint16_t
62qla2x00_calc_iocbs_32(uint16_t dsds)
63{
64 uint16_t iocbs;
65
66 iocbs = 1;
67 if (dsds > 3) {
68 iocbs += (dsds - 3) / 7;
69 if ((dsds - 3) % 7)
70 iocbs++;
71 }
72 return (iocbs);
73}
74
75/**
76 * qla2x00_calc_iocbs_64() - Determine number of Command Type 3 and
77 * Continuation Type 1 IOCBs to allocate.
78 *
79 * @dsds: number of data segment decriptors needed
80 *
81 * Returns the number of IOCB entries needed to store @dsds.
82 */
83uint16_t
84qla2x00_calc_iocbs_64(uint16_t dsds)
85{
86 uint16_t iocbs;
87
88 iocbs = 1;
89 if (dsds > 2) {
90 iocbs += (dsds - 2) / 5;
91 if ((dsds - 2) % 5)
92 iocbs++;
93 }
94 return (iocbs);
95}
96
97/**
98 * qla2x00_prep_cont_type0_iocb() - Initialize a Continuation Type 0 IOCB.
99 * @ha: HA context
100 *
101 * Returns a pointer to the Continuation Type 0 IOCB packet.
102 */
103static inline cont_entry_t *
104qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *ha)
105{
106 cont_entry_t *cont_pkt;
107
108 /* Adjust ring index. */
109 ha->req_ring_index++;
110 if (ha->req_ring_index == ha->request_q_length) {
111 ha->req_ring_index = 0;
112 ha->request_ring_ptr = ha->request_ring;
113 } else {
114 ha->request_ring_ptr++;
115 }
116
117 cont_pkt = (cont_entry_t *)ha->request_ring_ptr;
118
119 /* Load packet defaults. */
120 *((uint32_t *)(&cont_pkt->entry_type)) =
121 __constant_cpu_to_le32(CONTINUE_TYPE);
122
123 return (cont_pkt);
124}
125
126/**
127 * qla2x00_prep_cont_type1_iocb() - Initialize a Continuation Type 1 IOCB.
128 * @ha: HA context
129 *
130 * Returns a pointer to the continuation type 1 IOCB packet.
131 */
132static inline cont_a64_entry_t *
133qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *ha)
134{
135 cont_a64_entry_t *cont_pkt;
136
137 /* Adjust ring index. */
138 ha->req_ring_index++;
139 if (ha->req_ring_index == ha->request_q_length) {
140 ha->req_ring_index = 0;
141 ha->request_ring_ptr = ha->request_ring;
142 } else {
143 ha->request_ring_ptr++;
144 }
145
146 cont_pkt = (cont_a64_entry_t *)ha->request_ring_ptr;
147
148 /* Load packet defaults. */
149 *((uint32_t *)(&cont_pkt->entry_type)) =
150 __constant_cpu_to_le32(CONTINUE_A64_TYPE);
151
152 return (cont_pkt);
153}
154
155/**
156 * qla2x00_build_scsi_iocbs_32() - Build IOCB command utilizing 32bit
157 * capable IOCB types.
158 *
159 * @sp: SRB command to process
160 * @cmd_pkt: Command type 2 IOCB
161 * @tot_dsds: Total number of segments to transfer
162 */
163void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
164 uint16_t tot_dsds)
165{
166 uint16_t avail_dsds;
167 uint32_t *cur_dsd;
168 scsi_qla_host_t *ha;
169 struct scsi_cmnd *cmd;
170
171 cmd = sp->cmd;
172
173 /* Update entry type to indicate Command Type 2 IOCB */
174 *((uint32_t *)(&cmd_pkt->entry_type)) =
175 __constant_cpu_to_le32(COMMAND_TYPE);
176
177 /* No data transfer */
178 if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
179 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
180 return;
181 }
182
183 ha = sp->ha;
184
185 cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
186
187 /* Three DSDs are available in the Command Type 2 IOCB */
188 avail_dsds = 3;
189 cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
190
191 /* Load data segments */
192 if (cmd->use_sg != 0) {
193 struct scatterlist *cur_seg;
194 struct scatterlist *end_seg;
195
196 cur_seg = (struct scatterlist *)cmd->request_buffer;
197 end_seg = cur_seg + tot_dsds;
198 while (cur_seg < end_seg) {
199 cont_entry_t *cont_pkt;
200
201 /* Allocate additional continuation packets? */
202 if (avail_dsds == 0) {
203 /*
204 * Seven DSDs are available in the Continuation
205 * Type 0 IOCB.
206 */
207 cont_pkt = qla2x00_prep_cont_type0_iocb(ha);
208 cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
209 avail_dsds = 7;
210 }
211
212 *cur_dsd++ = cpu_to_le32(sg_dma_address(cur_seg));
213 *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
214 avail_dsds--;
215
216 cur_seg++;
217 }
218 } else {
83021920 219 *cur_dsd++ = cpu_to_le32(sp->dma_handle);
1da177e4
LT		 220 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
221 }
222}
223
224/**
225 * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
226 * capable IOCB types.
227 *
228 * @sp: SRB command to process
229 * @cmd_pkt: Command type 3 IOCB
230 * @tot_dsds: Total number of segments to transfer
231 */
232void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
233 uint16_t tot_dsds)
234{
235 uint16_t avail_dsds;
236 uint32_t *cur_dsd;
237 scsi_qla_host_t *ha;
238 struct scsi_cmnd *cmd;
239
240 cmd = sp->cmd;
241
242 /* Update entry type to indicate Command Type 3 IOCB */
243 *((uint32_t *)(&cmd_pkt->entry_type)) =
244 __constant_cpu_to_le32(COMMAND_A64_TYPE);
245
246 /* No data transfer */
247 if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
248 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
249 return;
250 }
251
252 ha = sp->ha;
253
254 cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
255
256 /* Two DSDs are available in the Command Type 3 IOCB */
257 avail_dsds = 2;
258 cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
259
260 /* Load data segments */
261 if (cmd->use_sg != 0) {
262 struct scatterlist *cur_seg;
263 struct scatterlist *end_seg;
264
265 cur_seg = (struct scatterlist *)cmd->request_buffer;
266 end_seg = cur_seg + tot_dsds;
267 while (cur_seg < end_seg) {
268 dma_addr_t sle_dma;
269 cont_a64_entry_t *cont_pkt;
270
271 /* Allocate additional continuation packets? */
272 if (avail_dsds == 0) {
273 /*
274 * Five DSDs are available in the Continuation
275 * Type 1 IOCB.
276 */
277 cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
278 cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
279 avail_dsds = 5;
280 }
281
282 sle_dma = sg_dma_address(cur_seg);
283 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
284 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
285 *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
286 avail_dsds--;
287
288 cur_seg++;
289 }
290 } else {
83021920 291 *cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
292 *cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
1da177e4
LT		 293 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
294 }
295}
296
297/**
298 * qla2x00_start_scsi() - Send a SCSI command to the ISP
299 * @sp: command to send to the ISP
300 *
301 * Returns non-zero if a failure occured, else zero.
302 */
303int
304qla2x00_start_scsi(srb_t *sp)
305{
306 int ret;
307 unsigned long flags;
308 scsi_qla_host_t *ha;
1da177e4
LT		 309 struct scsi_cmnd *cmd;
310 uint32_t *clr_ptr;
311 uint32_t index;
312 uint32_t handle;
313 cmd_entry_t *cmd_pkt;
1da177e4
LT		 314 struct scatterlist *sg;
315 uint16_t cnt;
316 uint16_t req_cnt;
317 uint16_t tot_dsds;
3d71644c 318 struct device_reg_2xxx __iomem *reg;
1da177e4
LT		 319 char tag[2];
320
321 /* Setup device pointers. */
322 ret = 0;
bdf79621 323 ha = sp->ha;
3d71644c 324 reg = &ha->iobase->isp;
1da177e4 325 cmd = sp->cmd;
83021920 326 /* So we know we haven't pci_map'ed anything yet */
327 tot_dsds = 0;
1da177e4
LT		 328
329 /* Send marker if required */
330 if (ha->marker_needed != 0) {
331 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
332 return (QLA_FUNCTION_FAILED);
333 }
334 ha->marker_needed = 0;
335 }
336
337 /* Acquire ring specific lock */
338 spin_lock_irqsave(&ha->hardware_lock, flags);
339
340 /* Check for room in outstanding command list. */
341 handle = ha->current_outstanding_cmd;
342 for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
343 handle++;
344 if (handle == MAX_OUTSTANDING_COMMANDS)
345 handle = 1;
346 if (ha->outstanding_cmds[handle] == 0)
347 break;
348 }
349 if (index == MAX_OUTSTANDING_COMMANDS)
350 goto queuing_error;
351
83021920 352 /* Map the sg table so we have an accurate count of sg entries needed */
353 if (cmd->use_sg) {
354 sg = (struct scatterlist *) cmd->request_buffer;
355 tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
356 cmd->sc_data_direction);
357 if (tot_dsds == 0)
358 goto queuing_error;
359 } else if (cmd->request_bufflen) {
360 dma_addr_t req_dma;
361
362 req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
363 cmd->request_bufflen, cmd->sc_data_direction);
364 if (dma_mapping_error(req_dma))
365 goto queuing_error;
366
367 sp->dma_handle = req_dma;
368 tot_dsds = 1;
369 }
370
1da177e4 371 /* Calculate the number of request entries needed. */
abbd8870 372 req_cnt = ha->isp_ops.calc_req_entries(tot_dsds);
1da177e4
LT		 373 if (ha->req_q_cnt < (req_cnt + 2)) {
374 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
375 if (ha->req_ring_index < cnt)
376 ha->req_q_cnt = cnt - ha->req_ring_index;
377 else
378 ha->req_q_cnt = ha->request_q_length -
379 (ha->req_ring_index - cnt);
380 }
381 if (ha->req_q_cnt < (req_cnt + 2))
382 goto queuing_error;
383
1da177e4
LT		 384 /* Build command packet */
385 ha->current_outstanding_cmd = handle;
386 ha->outstanding_cmds[handle] = sp;
387 sp->ha = ha;
388 sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
389 ha->req_q_cnt -= req_cnt;
390
391 cmd_pkt = (cmd_entry_t *)ha->request_ring_ptr;
392 cmd_pkt->handle = handle;
393 /* Zero out remaining portion of packet. */
394 clr_ptr = (uint32_t *)cmd_pkt + 2;
395 memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
396 cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
397
bdf79621 398 /* Set target ID and LUN number*/
399 SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
400 cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
1da177e4
LT		 401
402 /* Update tagged queuing modifier */
403 cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
404 if (scsi_populate_tag_msg(cmd, tag)) {
405 switch (tag[0]) {
406 case MSG_HEAD_TAG:
407 cmd_pkt->control_flags =
408 __constant_cpu_to_le16(CF_HEAD_TAG);
409 break;
410 case MSG_ORDERED_TAG:
411 cmd_pkt->control_flags =
412 __constant_cpu_to_le16(CF_ORDERED_TAG);
413 break;
414 }
415 }
416
1da177e4
LT		 417 /* Load SCSI command packet. */
418 memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
419 cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
420
421 /* Build IOCB segments */
abbd8870 422 ha->isp_ops.build_iocbs(sp, cmd_pkt, tot_dsds);
1da177e4
LT		 423
424 /* Set total data segment count. */
425 cmd_pkt->entry_count = (uint8_t)req_cnt;
426 wmb();
427
428 /* Adjust ring index. */
429 ha->req_ring_index++;
430 if (ha->req_ring_index == ha->request_q_length) {
431 ha->req_ring_index = 0;
432 ha->request_ring_ptr = ha->request_ring;
433 } else
434 ha->request_ring_ptr++;
435
1da177e4
LT		 436 sp->flags |= SRB_DMA_VALID;
437 sp->state = SRB_ACTIVE_STATE;
1da177e4
LT		 438
439 /* Set chip new ring index. */
440 WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
441 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg)); /* PCI Posting. */
442
4fdfefe5
AV		 443 /* Manage unprocessed RIO/ZIO commands in response queue. */
444 if (ha->flags.process_response_queue &&
445 ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
446 qla2x00_process_response_queue(ha);
447
1da177e4
LT		 448 spin_unlock_irqrestore(&ha->hardware_lock, flags);
449 return (QLA_SUCCESS);
450
451queuing_error:
83021920 452 if (cmd->use_sg && tot_dsds) {
453 sg = (struct scatterlist *) cmd->request_buffer;
454 pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
455 cmd->sc_data_direction);
456 } else if (tot_dsds) {
457 pci_unmap_single(ha->pdev, sp->dma_handle,
458 cmd->request_bufflen, cmd->sc_data_direction);
459 }
1da177e4
LT		 460 spin_unlock_irqrestore(&ha->hardware_lock, flags);
461
462 return (QLA_FUNCTION_FAILED);
463}
464
465/**
466 * qla2x00_marker() - Send a marker IOCB to the firmware.
467 * @ha: HA context
468 * @loop_id: loop ID
469 * @lun: LUN
470 * @type: marker modifier
471 *
472 * Can be called from both normal and interrupt context.
473 *
474 * Returns non-zero if a failure occured, else zero.
475 */
fa2a1ce5 476int
1da177e4
LT		 477__qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
478 uint8_t type)
479{
2b6c0cee
AV		 480 mrk_entry_t *mrk;
481 struct mrk_entry_24xx *mrk24;
1da177e4 482
2b6c0cee
AV		 483 mrk24 = NULL;
484 mrk = (mrk_entry_t *)qla2x00_req_pkt(ha);
485 if (mrk == NULL) {
486 DEBUG2_3(printk("%s(%ld): failed to allocate Marker IOCB.\n",
487 __func__, ha->host_no));
1da177e4
LT		 488
489 return (QLA_FUNCTION_FAILED);
490 }
491
2b6c0cee
AV		 492 mrk->entry_type = MARKER_TYPE;
493 mrk->modifier = type;
1da177e4 494 if (type != MK_SYNC_ALL) {
2b6c0cee
AV		 495 if (IS_QLA24XX(ha) || IS_QLA25XX(ha)) {
496 mrk24 = (struct mrk_entry_24xx *) mrk;
497 mrk24->nport_handle = cpu_to_le16(loop_id);
498 mrk24->lun[1] = LSB(lun);
499 mrk24->lun[2] = MSB(lun);
500 } else {
501 SET_TARGET_ID(ha, mrk->target, loop_id);
502 mrk->lun = cpu_to_le16(lun);
503 }
1da177e4
LT		 504 }
505 wmb();
506
1da177e4
LT		 507 qla2x00_isp_cmd(ha);
508
509 return (QLA_SUCCESS);
510}
511
fa2a1ce5 512int
1da177e4
LT		 513qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
514 uint8_t type)
515{
516 int ret;
517 unsigned long flags = 0;
518
519 spin_lock_irqsave(&ha->hardware_lock, flags);
520 ret = __qla2x00_marker(ha, loop_id, lun, type);
521 spin_unlock_irqrestore(&ha->hardware_lock, flags);
522
523 return (ret);
524}
525
526/**
527 * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
528 * @ha: HA context
529 *
530 * Note: The caller must hold the hardware lock before calling this routine.
531 *
532 * Returns NULL if function failed, else, a pointer to the request packet.
533 */
534static request_t *
535qla2x00_req_pkt(scsi_qla_host_t *ha)
536{
2b6c0cee 537 device_reg_t __iomem *reg = ha->iobase;
1da177e4
LT		 538 request_t *pkt = NULL;
539 uint16_t cnt;
540 uint32_t *dword_ptr;
541 uint32_t timer;
542 uint16_t req_cnt = 1;
543
544 /* Wait 1 second for slot. */
545 for (timer = HZ; timer; timer--) {
546 if ((req_cnt + 2) >= ha->req_q_cnt) {
547 /* Calculate number of free request entries. */
2b6c0cee
AV		 548 if (IS_QLA24XX(ha) || IS_QLA25XX(ha))
549 cnt = (uint16_t)RD_REG_DWORD(
550 &reg->isp24.req_q_out);
551 else
552 cnt = qla2x00_debounce_register(
553 ISP_REQ_Q_OUT(ha, &reg->isp));
1da177e4
LT		 554 if (ha->req_ring_index < cnt)
555 ha->req_q_cnt = cnt - ha->req_ring_index;
556 else
557 ha->req_q_cnt = ha->request_q_length -
558 (ha->req_ring_index - cnt);
559 }
560 /* If room for request in request ring. */
561 if ((req_cnt + 2) < ha->req_q_cnt) {
562 ha->req_q_cnt--;
563 pkt = ha->request_ring_ptr;
564
565 /* Zero out packet. */
566 dword_ptr = (uint32_t *)pkt;
567 for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
568 *dword_ptr++ = 0;
569
570 /* Set system defined field. */
571 pkt->sys_define = (uint8_t)ha->req_ring_index;
572
573 /* Set entry count. */
574 pkt->entry_count = 1;
575
576 break;
577 }
578
579 /* Release ring specific lock */
580 spin_unlock(&ha->hardware_lock);
581
582 udelay(2); /* 2 us */
583
584 /* Check for pending interrupts. */
585 /* During init we issue marker directly */
586 if (!ha->marker_needed)
587 qla2x00_poll(ha);
588
589 spin_lock_irq(&ha->hardware_lock);
590 }
591 if (!pkt) {
592 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
593 }
594
595 return (pkt);
596}
597
598/**
599 * qla2x00_isp_cmd() - Modify the request ring pointer.
600 * @ha: HA context
601 *
602 * Note: The caller must hold the hardware lock before calling this routine.
603 */
604void
605qla2x00_isp_cmd(scsi_qla_host_t *ha)
606{
2b6c0cee 607 device_reg_t __iomem *reg = ha->iobase;
1da177e4
LT		 608
609 DEBUG5(printk("%s(): IOCB data:\n", __func__));
610 DEBUG5(qla2x00_dump_buffer(
611 (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE));
612
613 /* Adjust ring index. */
614 ha->req_ring_index++;
615 if (ha->req_ring_index == ha->request_q_length) {
616 ha->req_ring_index = 0;
617 ha->request_ring_ptr = ha->request_ring;
618 } else
619 ha->request_ring_ptr++;
620
621 /* Set chip new ring index. */
2b6c0cee
AV		 622 if (IS_QLA24XX(ha) || IS_QLA25XX(ha)) {
623 WRT_REG_DWORD(&reg->isp24.req_q_in, ha->req_ring_index);
624 RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
625 } else {
626 WRT_REG_WORD(ISP_REQ_Q_IN(ha, &reg->isp), ha->req_ring_index);
627 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, &reg->isp));
628 }
629
630}
631
632/**
633 * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
634 * Continuation Type 1 IOCBs to allocate.
635 *
636 * @dsds: number of data segment decriptors needed
637 *
638 * Returns the number of IOCB entries needed to store @dsds.
639 */
640static inline uint16_t
641qla24xx_calc_iocbs(uint16_t dsds)
642{
643 uint16_t iocbs;
644
645 iocbs = 1;
646 if (dsds > 1) {
647 iocbs += (dsds - 1) / 5;
648 if ((dsds - 1) % 5)
649 iocbs++;
650 }
651 return iocbs;
652}
653
654/**
655 * qla24xx_build_scsi_iocbs() - Build IOCB command utilizing Command Type 7
656 * IOCB types.
657 *
658 * @sp: SRB command to process
659 * @cmd_pkt: Command type 3 IOCB
660 * @tot_dsds: Total number of segments to transfer
661 */
662static inline void
663qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
664 uint16_t tot_dsds)
665{
666 uint16_t avail_dsds;
667 uint32_t *cur_dsd;
668 scsi_qla_host_t *ha;
669 struct scsi_cmnd *cmd;
670
671 cmd = sp->cmd;
672
673 /* Update entry type to indicate Command Type 3 IOCB */
674 *((uint32_t *)(&cmd_pkt->entry_type)) =
675 __constant_cpu_to_le32(COMMAND_TYPE_7);
676
677 /* No data transfer */
678 if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
679 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
680 return;
681 }
682
683 ha = sp->ha;
684
685 /* Set transfer direction */
686 if (cmd->sc_data_direction == DMA_TO_DEVICE)
687 cmd_pkt->task_mgmt_flags =
688 __constant_cpu_to_le16(TMF_WRITE_DATA);
689 else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
690 cmd_pkt->task_mgmt_flags =
691 __constant_cpu_to_le16(TMF_READ_DATA);
692
693 /* One DSD is available in the Command Type 3 IOCB */
694 avail_dsds = 1;
695 cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
696
697 /* Load data segments */
698 if (cmd->use_sg != 0) {
699 struct scatterlist *cur_seg;
700 struct scatterlist *end_seg;
701
702 cur_seg = (struct scatterlist *)cmd->request_buffer;
703 end_seg = cur_seg + tot_dsds;
704 while (cur_seg < end_seg) {
705 dma_addr_t sle_dma;
706 cont_a64_entry_t *cont_pkt;
707
708 /* Allocate additional continuation packets? */
709 if (avail_dsds == 0) {
710 /*
711 * Five DSDs are available in the Continuation
712 * Type 1 IOCB.
713 */
714 cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
715 cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
716 avail_dsds = 5;
717 }
718
719 sle_dma = sg_dma_address(cur_seg);
720 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
721 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
722 *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
723 avail_dsds--;
724
725 cur_seg++;
726 }
727 } else {
728 *cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
729 *cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
730 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
731 }
732}
733
734
735/**
736 * qla24xx_start_scsi() - Send a SCSI command to the ISP
737 * @sp: command to send to the ISP
738 *
739 * Returns non-zero if a failure occured, else zero.
740 */
741int
742qla24xx_start_scsi(srb_t *sp)
743{
744 int ret;
745 unsigned long flags;
746 scsi_qla_host_t *ha;
747 struct scsi_cmnd *cmd;
748 uint32_t *clr_ptr;
749 uint32_t index;
750 uint32_t handle;
751 struct cmd_type_7 *cmd_pkt;
752 struct scatterlist *sg;
753 uint16_t cnt;
754 uint16_t req_cnt;
755 uint16_t tot_dsds;
db776a14 756 struct device_reg_24xx __iomem *reg;
2b6c0cee
AV		 757 char tag[2];
758
759 /* Setup device pointers. */
760 ret = 0;
761 ha = sp->ha;
762 reg = &ha->iobase->isp24;
763 cmd = sp->cmd;
764 /* So we know we haven't pci_map'ed anything yet */
765 tot_dsds = 0;
766
767 /* Send marker if required */
768 if (ha->marker_needed != 0) {
769 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
770 return QLA_FUNCTION_FAILED;
771 }
772 ha->marker_needed = 0;
773 }
774
775 /* Acquire ring specific lock */
776 spin_lock_irqsave(&ha->hardware_lock, flags);
777
778 /* Check for room in outstanding command list. */
779 handle = ha->current_outstanding_cmd;
780 for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
781 handle++;
782 if (handle == MAX_OUTSTANDING_COMMANDS)
783 handle = 1;
784 if (ha->outstanding_cmds[handle] == 0)
785 break;
786 }
787 if (index == MAX_OUTSTANDING_COMMANDS)
788 goto queuing_error;
789
790 /* Map the sg table so we have an accurate count of sg entries needed */
791 if (cmd->use_sg) {
792 sg = (struct scatterlist *) cmd->request_buffer;
793 tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
794 cmd->sc_data_direction);
795 if (tot_dsds == 0)
796 goto queuing_error;
797 } else if (cmd->request_bufflen) {
798 dma_addr_t req_dma;
799
800 req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
801 cmd->request_bufflen, cmd->sc_data_direction);
802 if (dma_mapping_error(req_dma))
803 goto queuing_error;
804
805 sp->dma_handle = req_dma;
806 tot_dsds = 1;
807 }
808
809 req_cnt = qla24xx_calc_iocbs(tot_dsds);
810 if (ha->req_q_cnt < (req_cnt + 2)) {
811 cnt = (uint16_t)RD_REG_DWORD_RELAXED(&reg->req_q_out);
812 if (ha->req_ring_index < cnt)
813 ha->req_q_cnt = cnt - ha->req_ring_index;
814 else
815 ha->req_q_cnt = ha->request_q_length -
816 (ha->req_ring_index - cnt);
817 }
131736d3 818 if (ha->req_q_cnt < (req_cnt + 2))
2b6c0cee 819 goto queuing_error;
2b6c0cee
AV		 820
821 /* Build command packet. */
822 ha->current_outstanding_cmd = handle;
823 ha->outstanding_cmds[handle] = sp;
824 sp->ha = ha;
825 sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
826 ha->req_q_cnt -= req_cnt;
827
828 cmd_pkt = (struct cmd_type_7 *)ha->request_ring_ptr;
829 cmd_pkt->handle = handle;
830
831 /* Zero out remaining portion of packet. */
832 clr_ptr = (uint32_t *)cmd_pkt + 2;
833 memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
834 cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
835
836 /* Set NPORT-ID and LUN number*/
837 cmd_pkt->nport_handle = cpu_to_le16(sp->fcport->loop_id);
838 cmd_pkt->port_id[0] = sp->fcport->d_id.b.al_pa;
839 cmd_pkt->port_id[1] = sp->fcport->d_id.b.area;
840 cmd_pkt->port_id[2] = sp->fcport->d_id.b.domain;
841
661c3f6c 842 int_to_scsilun(sp->cmd->device->lun, &cmd_pkt->lun);
2b6c0cee
AV		 843
844 /* Update tagged queuing modifier -- default is TSK_SIMPLE (0). */
845 if (scsi_populate_tag_msg(cmd, tag)) {
846 switch (tag[0]) {
847 case MSG_HEAD_TAG:
848 cmd_pkt->task = TSK_HEAD_OF_QUEUE;
849 break;
850 case MSG_ORDERED_TAG:
851 cmd_pkt->task = TSK_ORDERED;
852 break;
853 }
854 }
855
856 /* Load SCSI command packet. */
857 memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
858 host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
859
860 cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
861
862 /* Build IOCB segments */
863 qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
864
865 /* Set total data segment count. */
866 cmd_pkt->entry_count = (uint8_t)req_cnt;
867 wmb();
868
869 /* Adjust ring index. */
870 ha->req_ring_index++;
871 if (ha->req_ring_index == ha->request_q_length) {
872 ha->req_ring_index = 0;
873 ha->request_ring_ptr = ha->request_ring;
874 } else
875 ha->request_ring_ptr++;
876
877 sp->flags |= SRB_DMA_VALID;
878 sp->state = SRB_ACTIVE_STATE;
879
880 /* Set chip new ring index. */
881 WRT_REG_DWORD(&reg->req_q_in, ha->req_ring_index);
882 RD_REG_DWORD_RELAXED(&reg->req_q_in); /* PCI Posting. */
883
4fdfefe5
AV		 884 /* Manage unprocessed RIO/ZIO commands in response queue. */
885 if (ha->flags.process_response_queue &&
886 ha->response_ring_ptr->signature != RESPONSE_PROCESSED)
887 qla24xx_process_response_queue(ha);
888
2b6c0cee
AV		 889 spin_unlock_irqrestore(&ha->hardware_lock, flags);
890 return QLA_SUCCESS;
891
892queuing_error:
893 if (cmd->use_sg && tot_dsds) {
894 sg = (struct scatterlist *) cmd->request_buffer;
895 pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
896 cmd->sc_data_direction);
897 } else if (tot_dsds) {
898 pci_unmap_single(ha->pdev, sp->dma_handle,
899 cmd->request_bufflen, cmd->sc_data_direction);
900 }
901 spin_unlock_irqrestore(&ha->hardware_lock, flags);
902
903 return QLA_FUNCTION_FAILED;
1da177e4 904}
Linux 6.x block layer and io_uring tree(s)