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[PATCH] qla2xxx: remove lun discovery codes...
[deliverable/linux.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
5 * Copyright (C) 2003-2004 QLogic Corporation
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 {
219 dma_addr_t req_dma;
220 struct page *page;
221 unsigned long offset;
222
223 page = virt_to_page(cmd->request_buffer);
224 offset = ((unsigned long)cmd->request_buffer & ~PAGE_MASK);
225 req_dma = pci_map_page(ha->pdev, page, offset,
226 cmd->request_bufflen, cmd->sc_data_direction);
227
228 sp->dma_handle = req_dma;
229
230 *cur_dsd++ = cpu_to_le32(req_dma);
231 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
232 }
233}
234
235/**
236 * qla2x00_build_scsi_iocbs_64() - Build IOCB command utilizing 64bit
237 * capable IOCB types.
238 *
239 * @sp: SRB command to process
240 * @cmd_pkt: Command type 3 IOCB
241 * @tot_dsds: Total number of segments to transfer
242 */
243void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
244 uint16_t tot_dsds)
245{
246 uint16_t avail_dsds;
247 uint32_t *cur_dsd;
248 scsi_qla_host_t *ha;
249 struct scsi_cmnd *cmd;
250
251 cmd = sp->cmd;
252
253 /* Update entry type to indicate Command Type 3 IOCB */
254 *((uint32_t *)(&cmd_pkt->entry_type)) =
255 __constant_cpu_to_le32(COMMAND_A64_TYPE);
256
257 /* No data transfer */
258 if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
259 cmd_pkt->byte_count = __constant_cpu_to_le32(0);
260 return;
261 }
262
263 ha = sp->ha;
264
265 cmd_pkt->control_flags |= cpu_to_le16(qla2x00_get_cmd_direction(cmd));
266
267 /* Two DSDs are available in the Command Type 3 IOCB */
268 avail_dsds = 2;
269 cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
270
271 /* Load data segments */
272 if (cmd->use_sg != 0) {
273 struct scatterlist *cur_seg;
274 struct scatterlist *end_seg;
275
276 cur_seg = (struct scatterlist *)cmd->request_buffer;
277 end_seg = cur_seg + tot_dsds;
278 while (cur_seg < end_seg) {
279 dma_addr_t sle_dma;
280 cont_a64_entry_t *cont_pkt;
281
282 /* Allocate additional continuation packets? */
283 if (avail_dsds == 0) {
284 /*
285 * Five DSDs are available in the Continuation
286 * Type 1 IOCB.
287 */
288 cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
289 cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
290 avail_dsds = 5;
291 }
292
293 sle_dma = sg_dma_address(cur_seg);
294 *cur_dsd++ = cpu_to_le32(LSD(sle_dma));
295 *cur_dsd++ = cpu_to_le32(MSD(sle_dma));
296 *cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
297 avail_dsds--;
298
299 cur_seg++;
300 }
301 } else {
302 dma_addr_t req_dma;
303 struct page *page;
304 unsigned long offset;
305
306 page = virt_to_page(cmd->request_buffer);
307 offset = ((unsigned long)cmd->request_buffer & ~PAGE_MASK);
308 req_dma = pci_map_page(ha->pdev, page, offset,
309 cmd->request_bufflen, cmd->sc_data_direction);
310
311 sp->dma_handle = req_dma;
312
313 *cur_dsd++ = cpu_to_le32(LSD(req_dma));
314 *cur_dsd++ = cpu_to_le32(MSD(req_dma));
315 *cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
316 }
317}
318
319/**
320 * qla2x00_start_scsi() - Send a SCSI command to the ISP
321 * @sp: command to send to the ISP
322 *
323 * Returns non-zero if a failure occured, else zero.
324 */
325int
326qla2x00_start_scsi(srb_t *sp)
327{
328 int ret;
329 unsigned long flags;
330 scsi_qla_host_t *ha;
1da177e4
LT		 331 struct scsi_cmnd *cmd;
332 uint32_t *clr_ptr;
333 uint32_t index;
334 uint32_t handle;
335 cmd_entry_t *cmd_pkt;
1da177e4
LT		 336 struct scatterlist *sg;
337 uint16_t cnt;
338 uint16_t req_cnt;
339 uint16_t tot_dsds;
340 device_reg_t __iomem *reg;
341 char tag[2];
342
343 /* Setup device pointers. */
344 ret = 0;
bdf79621 345 ha = sp->ha;
1da177e4
LT		 346 reg = ha->iobase;
347 cmd = sp->cmd;
348
349 /* Send marker if required */
350 if (ha->marker_needed != 0) {
351 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
352 return (QLA_FUNCTION_FAILED);
353 }
354 ha->marker_needed = 0;
355 }
356
357 /* Acquire ring specific lock */
358 spin_lock_irqsave(&ha->hardware_lock, flags);
359
360 /* Check for room in outstanding command list. */
361 handle = ha->current_outstanding_cmd;
362 for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
363 handle++;
364 if (handle == MAX_OUTSTANDING_COMMANDS)
365 handle = 1;
366 if (ha->outstanding_cmds[handle] == 0)
367 break;
368 }
369 if (index == MAX_OUTSTANDING_COMMANDS)
370 goto queuing_error;
371
372 /* Calculate the number of request entries needed. */
373 req_cnt = (ha->calc_request_entries)(cmd->request->nr_hw_segments);
374 if (ha->req_q_cnt < (req_cnt + 2)) {
375 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
376 if (ha->req_ring_index < cnt)
377 ha->req_q_cnt = cnt - ha->req_ring_index;
378 else
379 ha->req_q_cnt = ha->request_q_length -
380 (ha->req_ring_index - cnt);
381 }
382 if (ha->req_q_cnt < (req_cnt + 2))
383 goto queuing_error;
384
385 /* Finally, we have enough space, now perform mappings. */
386 tot_dsds = 0;
387 if (cmd->use_sg) {
388 sg = (struct scatterlist *) cmd->request_buffer;
389 tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
390 cmd->sc_data_direction);
391 if (tot_dsds == 0)
392 goto queuing_error;
393 } else if (cmd->request_bufflen) {
394 tot_dsds++;
395 }
396 req_cnt = (ha->calc_request_entries)(tot_dsds);
397
398 /* Build command packet */
399 ha->current_outstanding_cmd = handle;
400 ha->outstanding_cmds[handle] = sp;
401 sp->ha = ha;
402 sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
403 ha->req_q_cnt -= req_cnt;
404
405 cmd_pkt = (cmd_entry_t *)ha->request_ring_ptr;
406 cmd_pkt->handle = handle;
407 /* Zero out remaining portion of packet. */
408 clr_ptr = (uint32_t *)cmd_pkt + 2;
409 memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
410 cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
411
bdf79621 412 /* Set target ID and LUN number*/
413 SET_TARGET_ID(ha, cmd_pkt->target, sp->fcport->loop_id);
414 cmd_pkt->lun = cpu_to_le16(sp->cmd->device->lun);
1da177e4
LT		 415
416 /* Update tagged queuing modifier */
417 cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
418 if (scsi_populate_tag_msg(cmd, tag)) {
419 switch (tag[0]) {
420 case MSG_HEAD_TAG:
421 cmd_pkt->control_flags =
422 __constant_cpu_to_le16(CF_HEAD_TAG);
423 break;
424 case MSG_ORDERED_TAG:
425 cmd_pkt->control_flags =
426 __constant_cpu_to_le16(CF_ORDERED_TAG);
427 break;
428 }
429 }
430
1da177e4
LT		 431 /* Load SCSI command packet. */
432 memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
433 cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
434
435 /* Build IOCB segments */
436 (ha->build_scsi_iocbs)(sp, cmd_pkt, tot_dsds);
437
438 /* Set total data segment count. */
439 cmd_pkt->entry_count = (uint8_t)req_cnt;
440 wmb();
441
442 /* Adjust ring index. */
443 ha->req_ring_index++;
444 if (ha->req_ring_index == ha->request_q_length) {
445 ha->req_ring_index = 0;
446 ha->request_ring_ptr = ha->request_ring;
447 } else
448 ha->request_ring_ptr++;
449
450 ha->actthreads++;
451 ha->total_ios++;
1da177e4
LT		 452 sp->flags |= SRB_DMA_VALID;
453 sp->state = SRB_ACTIVE_STATE;
454 sp->u_start = jiffies;
455
456 /* Set chip new ring index. */
457 WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
458 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg)); /* PCI Posting. */
459
460 spin_unlock_irqrestore(&ha->hardware_lock, flags);
461 return (QLA_SUCCESS);
462
463queuing_error:
464 spin_unlock_irqrestore(&ha->hardware_lock, flags);
465
466 return (QLA_FUNCTION_FAILED);
467}
468
469/**
470 * qla2x00_marker() - Send a marker IOCB to the firmware.
471 * @ha: HA context
472 * @loop_id: loop ID
473 * @lun: LUN
474 * @type: marker modifier
475 *
476 * Can be called from both normal and interrupt context.
477 *
478 * Returns non-zero if a failure occured, else zero.
479 */
480int
481__qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
482 uint8_t type)
483{
484 mrk_entry_t *pkt;
485
486 pkt = (mrk_entry_t *)qla2x00_req_pkt(ha);
487 if (pkt == NULL) {
488 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
489
490 return (QLA_FUNCTION_FAILED);
491 }
492
493 pkt->entry_type = MARKER_TYPE;
494 pkt->modifier = type;
495
496 if (type != MK_SYNC_ALL) {
497 pkt->lun = cpu_to_le16(lun);
498 SET_TARGET_ID(ha, pkt->target, loop_id);
499 }
500 wmb();
501
502 /* Issue command to ISP */
503 qla2x00_isp_cmd(ha);
504
505 return (QLA_SUCCESS);
506}
507
508int
509qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
510 uint8_t type)
511{
512 int ret;
513 unsigned long flags = 0;
514
515 spin_lock_irqsave(&ha->hardware_lock, flags);
516 ret = __qla2x00_marker(ha, loop_id, lun, type);
517 spin_unlock_irqrestore(&ha->hardware_lock, flags);
518
519 return (ret);
520}
521
522/**
523 * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
524 * @ha: HA context
525 *
526 * Note: The caller must hold the hardware lock before calling this routine.
527 *
528 * Returns NULL if function failed, else, a pointer to the request packet.
529 */
530static request_t *
531qla2x00_req_pkt(scsi_qla_host_t *ha)
532{
533 device_reg_t __iomem *reg = ha->iobase;
534 request_t *pkt = NULL;
535 uint16_t cnt;
536 uint32_t *dword_ptr;
537 uint32_t timer;
538 uint16_t req_cnt = 1;
539
540 /* Wait 1 second for slot. */
541 for (timer = HZ; timer; timer--) {
542 if ((req_cnt + 2) >= ha->req_q_cnt) {
543 /* Calculate number of free request entries. */
544 cnt = qla2x00_debounce_register(ISP_REQ_Q_OUT(ha, reg));
545 if (ha->req_ring_index < cnt)
546 ha->req_q_cnt = cnt - ha->req_ring_index;
547 else
548 ha->req_q_cnt = ha->request_q_length -
549 (ha->req_ring_index - cnt);
550 }
551 /* If room for request in request ring. */
552 if ((req_cnt + 2) < ha->req_q_cnt) {
553 ha->req_q_cnt--;
554 pkt = ha->request_ring_ptr;
555
556 /* Zero out packet. */
557 dword_ptr = (uint32_t *)pkt;
558 for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
559 *dword_ptr++ = 0;
560
561 /* Set system defined field. */
562 pkt->sys_define = (uint8_t)ha->req_ring_index;
563
564 /* Set entry count. */
565 pkt->entry_count = 1;
566
567 break;
568 }
569
570 /* Release ring specific lock */
571 spin_unlock(&ha->hardware_lock);
572
573 udelay(2); /* 2 us */
574
575 /* Check for pending interrupts. */
576 /* During init we issue marker directly */
577 if (!ha->marker_needed)
578 qla2x00_poll(ha);
579
580 spin_lock_irq(&ha->hardware_lock);
581 }
582 if (!pkt) {
583 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
584 }
585
586 return (pkt);
587}
588
589/**
590 * qla2x00_isp_cmd() - Modify the request ring pointer.
591 * @ha: HA context
592 *
593 * Note: The caller must hold the hardware lock before calling this routine.
594 */
595void
596qla2x00_isp_cmd(scsi_qla_host_t *ha)
597{
598 device_reg_t __iomem *reg = ha->iobase;
599
600 DEBUG5(printk("%s(): IOCB data:\n", __func__));
601 DEBUG5(qla2x00_dump_buffer(
602 (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE));
603
604 /* Adjust ring index. */
605 ha->req_ring_index++;
606 if (ha->req_ring_index == ha->request_q_length) {
607 ha->req_ring_index = 0;
608 ha->request_ring_ptr = ha->request_ring;
609 } else
610 ha->request_ring_ptr++;
611
612 /* Set chip new ring index. */
613 WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
614 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg)); /* PCI Posting. */
615}
Linux kernel - Deliverables
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