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Linux-2.6.12-rc2
[linux-2.6/next.git] / drivers / scsi / qla2xxx / qla_iocb.c
blobec066074c72297baa28e1c81804269a09149e06c
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
27 static inline uint16_t qla2x00_get_cmd_direction(struct scsi_cmnd *cmd);
28 static inline cont_entry_t *qla2x00_prep_cont_type0_iocb(scsi_qla_host_t *);
29 static inline cont_a64_entry_t *qla2x00_prep_cont_type1_iocb(scsi_qla_host_t *);
30 static 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 */
38 static inline uint16_t
39 qla2x00_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 */
61 uint16_t
62 qla2x00_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 */
83 uint16_t
84 qla2x00_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 */
103 static inline cont_entry_t *
104 qla2x00_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 */
132 static inline cont_a64_entry_t *
133 qla2x00_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 */
163 void 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 */
243 void 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 */
325 int
326 qla2x00_start_scsi(srb_t *sp)
327 {
328 int ret;
329 unsigned long flags;
330 scsi_qla_host_t *ha;
331 fc_lun_t *fclun;
332 struct scsi_cmnd *cmd;
333 uint32_t *clr_ptr;
334 uint32_t index;
335 uint32_t handle;
336 cmd_entry_t *cmd_pkt;
337 uint32_t timeout;
338 struct scatterlist *sg;
339 uint16_t cnt;
340 uint16_t req_cnt;
341 uint16_t tot_dsds;
342 device_reg_t __iomem *reg;
343 char tag[2];
344
345 /* Setup device pointers. */
346 ret = 0;
347 fclun = sp->lun_queue->fclun;
348 ha = fclun->fcport->ha;
349 reg = ha->iobase;
350 cmd = sp->cmd;
351
352 /* Send marker if required */
353 if (ha->marker_needed != 0) {
354 if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) != QLA_SUCCESS) {
355 return (QLA_FUNCTION_FAILED);
356 }
357 ha->marker_needed = 0;
358 }
359
360 /* Acquire ring specific lock */
361 spin_lock_irqsave(&ha->hardware_lock, flags);
362
363 /* Check for room in outstanding command list. */
364 handle = ha->current_outstanding_cmd;
365 for (index = 1; index < MAX_OUTSTANDING_COMMANDS; index++) {
366 handle++;
367 if (handle == MAX_OUTSTANDING_COMMANDS)
368 handle = 1;
369 if (ha->outstanding_cmds[handle] == 0)
370 break;
371 }
372 if (index == MAX_OUTSTANDING_COMMANDS)
373 goto queuing_error;
374
375 /* Calculate the number of request entries needed. */
376 req_cnt = (ha->calc_request_entries)(cmd->request->nr_hw_segments);
377 if (ha->req_q_cnt < (req_cnt + 2)) {
378 cnt = RD_REG_WORD_RELAXED(ISP_REQ_Q_OUT(ha, reg));
379 if (ha->req_ring_index < cnt)
380 ha->req_q_cnt = cnt - ha->req_ring_index;
381 else
382 ha->req_q_cnt = ha->request_q_length -
383 (ha->req_ring_index - cnt);
384 }
385 if (ha->req_q_cnt < (req_cnt + 2))
386 goto queuing_error;
387
388 /* Finally, we have enough space, now perform mappings. */
389 tot_dsds = 0;
390 if (cmd->use_sg) {
391 sg = (struct scatterlist *) cmd->request_buffer;
392 tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
393 cmd->sc_data_direction);
394 if (tot_dsds == 0)
395 goto queuing_error;
396 } else if (cmd->request_bufflen) {
397 tot_dsds++;
398 }
399 req_cnt = (ha->calc_request_entries)(tot_dsds);
400
401 /* Build command packet */
402 ha->current_outstanding_cmd = handle;
403 ha->outstanding_cmds[handle] = sp;
404 sp->ha = ha;
405 sp->cmd->host_scribble = (unsigned char *)(unsigned long)handle;
406 ha->req_q_cnt -= req_cnt;
407
408 cmd_pkt = (cmd_entry_t *)ha->request_ring_ptr;
409 cmd_pkt->handle = handle;
410 /* Zero out remaining portion of packet. */
411 clr_ptr = (uint32_t *)cmd_pkt + 2;
412 memset(clr_ptr, 0, REQUEST_ENTRY_SIZE - 8);
413 cmd_pkt->dseg_count = cpu_to_le16(tot_dsds);
414
415 /* Set target ID */
416 SET_TARGET_ID(ha, cmd_pkt->target, fclun->fcport->loop_id);
417
418 /* Set LUN number*/
419 cmd_pkt->lun = cpu_to_le16(fclun->lun);
420
421 /* Update tagged queuing modifier */
422 cmd_pkt->control_flags = __constant_cpu_to_le16(CF_SIMPLE_TAG);
423 if (scsi_populate_tag_msg(cmd, tag)) {
424 switch (tag[0]) {
425 case MSG_HEAD_TAG:
426 cmd_pkt->control_flags =
427 __constant_cpu_to_le16(CF_HEAD_TAG);
428 break;
429 case MSG_ORDERED_TAG:
430 cmd_pkt->control_flags =
431 __constant_cpu_to_le16(CF_ORDERED_TAG);
432 break;
433 }
434 }
435
436 /*
437 * Allocate at least 5 (+ QLA_CMD_TIMER_DELTA) seconds for RISC timeout.
438 */
439 timeout = (uint32_t)(cmd->timeout_per_command / HZ);
440 if (timeout > 65535)
441 cmd_pkt->timeout = __constant_cpu_to_le16(0);
442 else if (timeout > 25)
443 cmd_pkt->timeout = cpu_to_le16((uint16_t)timeout -
444 (5 + QLA_CMD_TIMER_DELTA));
445 else
446 cmd_pkt->timeout = cpu_to_le16((uint16_t)timeout);
447
448 /* Load SCSI command packet. */
449 memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
450 cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
451
452 /* Build IOCB segments */
453 (ha->build_scsi_iocbs)(sp, cmd_pkt, tot_dsds);
454
455 /* Set total data segment count. */
456 cmd_pkt->entry_count = (uint8_t)req_cnt;
457 wmb();
458
459 /* Adjust ring index. */
460 ha->req_ring_index++;
461 if (ha->req_ring_index == ha->request_q_length) {
462 ha->req_ring_index = 0;
463 ha->request_ring_ptr = ha->request_ring;
464 } else
465 ha->request_ring_ptr++;
466
467 ha->actthreads++;
468 ha->total_ios++;
469 sp->lun_queue->out_cnt++;
470 sp->flags |= SRB_DMA_VALID;
471 sp->state = SRB_ACTIVE_STATE;
472 sp->u_start = jiffies;
473
474 /* Set chip new ring index. */
475 WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
476 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg)); /* PCI Posting. */
477
478 spin_unlock_irqrestore(&ha->hardware_lock, flags);
479 return (QLA_SUCCESS);
480
481 queuing_error:
482 spin_unlock_irqrestore(&ha->hardware_lock, flags);
483
484 return (QLA_FUNCTION_FAILED);
485 }
486
487 /**
488 * qla2x00_marker() - Send a marker IOCB to the firmware.
489 * @ha: HA context
490 * @loop_id: loop ID
491 * @lun: LUN
492 * @type: marker modifier
493 *
494 * Can be called from both normal and interrupt context.
495 *
496 * Returns non-zero if a failure occured, else zero.
497 */
498 int
499 __qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
500 uint8_t type)
501 {
502 mrk_entry_t *pkt;
503
504 pkt = (mrk_entry_t *)qla2x00_req_pkt(ha);
505 if (pkt == NULL) {
506 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
507
508 return (QLA_FUNCTION_FAILED);
509 }
510
511 pkt->entry_type = MARKER_TYPE;
512 pkt->modifier = type;
513
514 if (type != MK_SYNC_ALL) {
515 pkt->lun = cpu_to_le16(lun);
516 SET_TARGET_ID(ha, pkt->target, loop_id);
517 }
518 wmb();
519
520 /* Issue command to ISP */
521 qla2x00_isp_cmd(ha);
522
523 return (QLA_SUCCESS);
524 }
525
526 int
527 qla2x00_marker(scsi_qla_host_t *ha, uint16_t loop_id, uint16_t lun,
528 uint8_t type)
529 {
530 int ret;
531 unsigned long flags = 0;
532
533 spin_lock_irqsave(&ha->hardware_lock, flags);
534 ret = __qla2x00_marker(ha, loop_id, lun, type);
535 spin_unlock_irqrestore(&ha->hardware_lock, flags);
536
537 return (ret);
538 }
539
540 /**
541 * qla2x00_req_pkt() - Retrieve a request packet from the request ring.
542 * @ha: HA context
543 *
544 * Note: The caller must hold the hardware lock before calling this routine.
545 *
546 * Returns NULL if function failed, else, a pointer to the request packet.
547 */
548 static request_t *
549 qla2x00_req_pkt(scsi_qla_host_t *ha)
550 {
551 device_reg_t __iomem *reg = ha->iobase;
552 request_t *pkt = NULL;
553 uint16_t cnt;
554 uint32_t *dword_ptr;
555 uint32_t timer;
556 uint16_t req_cnt = 1;
557
558 /* Wait 1 second for slot. */
559 for (timer = HZ; timer; timer--) {
560 if ((req_cnt + 2) >= ha->req_q_cnt) {
561 /* Calculate number of free request entries. */
562 cnt = qla2x00_debounce_register(ISP_REQ_Q_OUT(ha, reg));
563 if (ha->req_ring_index < cnt)
564 ha->req_q_cnt = cnt - ha->req_ring_index;
565 else
566 ha->req_q_cnt = ha->request_q_length -
567 (ha->req_ring_index - cnt);
568 }
569 /* If room for request in request ring. */
570 if ((req_cnt + 2) < ha->req_q_cnt) {
571 ha->req_q_cnt--;
572 pkt = ha->request_ring_ptr;
573
574 /* Zero out packet. */
575 dword_ptr = (uint32_t *)pkt;
576 for (cnt = 0; cnt < REQUEST_ENTRY_SIZE / 4; cnt++)
577 *dword_ptr++ = 0;
578
579 /* Set system defined field. */
580 pkt->sys_define = (uint8_t)ha->req_ring_index;
581
582 /* Set entry count. */
583 pkt->entry_count = 1;
584
585 break;
586 }
587
588 /* Release ring specific lock */
589 spin_unlock(&ha->hardware_lock);
590
591 udelay(2); /* 2 us */
592
593 /* Check for pending interrupts. */
594 /* During init we issue marker directly */
595 if (!ha->marker_needed)
596 qla2x00_poll(ha);
597
598 spin_lock_irq(&ha->hardware_lock);
599 }
600 if (!pkt) {
601 DEBUG2_3(printk("%s(): **** FAILED ****\n", __func__));
602 }
603
604 return (pkt);
605 }
606
607 /**
608 * qla2x00_isp_cmd() - Modify the request ring pointer.
609 * @ha: HA context
610 *
611 * Note: The caller must hold the hardware lock before calling this routine.
612 */
613 void
614 qla2x00_isp_cmd(scsi_qla_host_t *ha)
615 {
616 device_reg_t __iomem *reg = ha->iobase;
617
618 DEBUG5(printk("%s(): IOCB data:\n", __func__));
619 DEBUG5(qla2x00_dump_buffer(
620 (uint8_t *)ha->request_ring_ptr, REQUEST_ENTRY_SIZE));
621
622 /* Adjust ring index. */
623 ha->req_ring_index++;
624 if (ha->req_ring_index == ha->request_q_length) {
625 ha->req_ring_index = 0;
626 ha->request_ring_ptr = ha->request_ring;
627 } else
628 ha->request_ring_ptr++;
629
630 /* Set chip new ring index. */
631 WRT_REG_WORD(ISP_REQ_Q_IN(ha, reg), ha->req_ring_index);
632 RD_REG_WORD_RELAXED(ISP_REQ_Q_IN(ha, reg)); /* PCI Posting. */
633 }
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