summaryrefslogtreecommitdiff
path: root/drivers/scsi/aic94xx/aic94xx_scb.c
blob: 8f43ff772f2378290d99af151a409b7dd19d6792 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
/*
 * Aic94xx SAS/SATA driver SCB management.
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
 *
 * This file is licensed under GPLv2.
 *
 * This file is part of the aic94xx driver.
 *
 * The aic94xx driver is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; version 2 of the
 * License.
 *
 * The aic94xx driver is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the aic94xx driver; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <linux/pci.h>
#include <scsi/scsi_host.h>

#include "aic94xx.h"
#include "aic94xx_reg.h"
#include "aic94xx_hwi.h"
#include "aic94xx_seq.h"

#include "aic94xx_dump.h"

/* ---------- EMPTY SCB ---------- */

#define DL_PHY_MASK      7
#define BYTES_DMAED      0
#define PRIMITIVE_RECVD  0x08
#define PHY_EVENT        0x10
#define LINK_RESET_ERROR 0x18
#define TIMER_EVENT      0x20
#define REQ_TASK_ABORT   0xF0
#define REQ_DEVICE_RESET 0xF1
#define SIGNAL_NCQ_ERROR 0xF2
#define CLEAR_NCQ_ERROR  0xF3

#define PHY_EVENTS_STATUS (CURRENT_LOSS_OF_SIGNAL | CURRENT_OOB_DONE   \
			   | CURRENT_SPINUP_HOLD | CURRENT_GTO_TIMEOUT \
			   | CURRENT_OOB_ERROR)

static inline void get_lrate_mode(struct asd_phy *phy, u8 oob_mode)
{
	struct sas_phy *sas_phy = phy->sas_phy.phy;

	switch (oob_mode & 7) {
	case PHY_SPEED_60:
		/* FIXME: sas transport class doesn't have this */
		phy->sas_phy.linkrate = SAS_LINK_RATE_6_0_GBPS;
		phy->sas_phy.phy->negotiated_linkrate = SAS_LINK_RATE_6_0_GBPS;
		break;
	case PHY_SPEED_30:
		phy->sas_phy.linkrate = SAS_LINK_RATE_3_0_GBPS;
		phy->sas_phy.phy->negotiated_linkrate = SAS_LINK_RATE_3_0_GBPS;
		break;
	case PHY_SPEED_15:
		phy->sas_phy.linkrate = SAS_LINK_RATE_1_5_GBPS;
		phy->sas_phy.phy->negotiated_linkrate = SAS_LINK_RATE_1_5_GBPS;
		break;
	}
	sas_phy->negotiated_linkrate = phy->sas_phy.linkrate;
	sas_phy->maximum_linkrate_hw = SAS_LINK_RATE_3_0_GBPS;
	sas_phy->minimum_linkrate_hw = SAS_LINK_RATE_1_5_GBPS;
	sas_phy->maximum_linkrate = phy->phy_desc->max_sas_lrate;
	sas_phy->minimum_linkrate = phy->phy_desc->min_sas_lrate;

	if (oob_mode & SAS_MODE)
		phy->sas_phy.oob_mode = SAS_OOB_MODE;
	else if (oob_mode & SATA_MODE)
		phy->sas_phy.oob_mode = SATA_OOB_MODE;
}

static inline void asd_phy_event_tasklet(struct asd_ascb *ascb,
					 struct done_list_struct *dl)
{
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct sas_ha_struct *sas_ha = &asd_ha->sas_ha;
	int phy_id = dl->status_block[0] & DL_PHY_MASK;
	struct asd_phy *phy = &asd_ha->phys[phy_id];

	u8 oob_status = dl->status_block[1] & PHY_EVENTS_STATUS;
	u8 oob_mode   = dl->status_block[2];

	switch (oob_status) {
	case CURRENT_LOSS_OF_SIGNAL:
		/* directly attached device was removed */
		ASD_DPRINTK("phy%d: device unplugged\n", phy_id);
		asd_turn_led(asd_ha, phy_id, 0);
		sas_phy_disconnected(&phy->sas_phy);
		sas_ha->notify_phy_event(&phy->sas_phy, PHYE_LOSS_OF_SIGNAL);
		break;
	case CURRENT_OOB_DONE:
		/* hot plugged device */
		asd_turn_led(asd_ha, phy_id, 1);
		get_lrate_mode(phy, oob_mode);
		ASD_DPRINTK("phy%d device plugged: lrate:0x%x, proto:0x%x\n",
			    phy_id, phy->sas_phy.linkrate, phy->sas_phy.iproto);
		sas_ha->notify_phy_event(&phy->sas_phy, PHYE_OOB_DONE);
		break;
	case CURRENT_SPINUP_HOLD:
		/* hot plug SATA, no COMWAKE sent */
		asd_turn_led(asd_ha, phy_id, 1);
		sas_ha->notify_phy_event(&phy->sas_phy, PHYE_SPINUP_HOLD);
		break;
	case CURRENT_GTO_TIMEOUT:
	case CURRENT_OOB_ERROR:
		ASD_DPRINTK("phy%d error while OOB: oob status:0x%x\n", phy_id,
			    dl->status_block[1]);
		asd_turn_led(asd_ha, phy_id, 0);
		sas_phy_disconnected(&phy->sas_phy);
		sas_ha->notify_phy_event(&phy->sas_phy, PHYE_OOB_ERROR);
		break;
	}
}

/* If phys are enabled sparsely, this will do the right thing. */
static inline unsigned ord_phy(struct asd_ha_struct *asd_ha,
			       struct asd_phy *phy)
{
	u8 enabled_mask = asd_ha->hw_prof.enabled_phys;
	int i, k = 0;

	for_each_phy(enabled_mask, enabled_mask, i) {
		if (&asd_ha->phys[i] == phy)
			return k;
		k++;
	}
	return 0;
}

/**
 * asd_get_attached_sas_addr -- extract/generate attached SAS address
 * phy: pointer to asd_phy
 * sas_addr: pointer to buffer where the SAS address is to be written
 *
 * This function extracts the SAS address from an IDENTIFY frame
 * received.  If OOB is SATA, then a SAS address is generated from the
 * HA tables.
 *
 * LOCKING: the frame_rcvd_lock needs to be held since this parses the frame
 * buffer.
 */
static inline void asd_get_attached_sas_addr(struct asd_phy *phy, u8 *sas_addr)
{
	if (phy->sas_phy.frame_rcvd[0] == 0x34
	    && phy->sas_phy.oob_mode == SATA_OOB_MODE) {
		struct asd_ha_struct *asd_ha = phy->sas_phy.ha->lldd_ha;
		/* FIS device-to-host */
		u64 addr = be64_to_cpu(*(__be64 *)phy->phy_desc->sas_addr);

		addr += asd_ha->hw_prof.sata_name_base + ord_phy(asd_ha, phy);
		*(__be64 *)sas_addr = cpu_to_be64(addr);
	} else {
		struct sas_identify_frame *idframe =
			(void *) phy->sas_phy.frame_rcvd;
		memcpy(sas_addr, idframe->sas_addr, SAS_ADDR_SIZE);
	}
}

static void asd_form_port(struct asd_ha_struct *asd_ha, struct asd_phy *phy)
{
	int i;
	struct asd_port *free_port = NULL;
	struct asd_port *port;
	struct asd_sas_phy *sas_phy = &phy->sas_phy;
	unsigned long flags;

	spin_lock_irqsave(&asd_ha->asd_ports_lock, flags);
	if (!phy->asd_port) {
		for (i = 0; i < ASD_MAX_PHYS; i++) {
			port = &asd_ha->asd_ports[i];

			/* Check for wide port */
			if (port->num_phys > 0 &&
			    memcmp(port->sas_addr, sas_phy->sas_addr,
				   SAS_ADDR_SIZE) == 0 &&
			    memcmp(port->attached_sas_addr,
				   sas_phy->attached_sas_addr,
				   SAS_ADDR_SIZE) == 0) {
				break;
			}

			/* Find a free port */
			if (port->num_phys == 0 && free_port == NULL) {
				free_port = port;
			}
		}

		/* Use a free port if this doesn't form a wide port */
		if (i >= ASD_MAX_PHYS) {
			port = free_port;
			BUG_ON(!port);
			memcpy(port->sas_addr, sas_phy->sas_addr,
			       SAS_ADDR_SIZE);
			memcpy(port->attached_sas_addr,
			       sas_phy->attached_sas_addr,
			       SAS_ADDR_SIZE);
		}
		port->num_phys++;
		port->phy_mask |= (1U << sas_phy->id);
		phy->asd_port = port;
	}
	ASD_DPRINTK("%s: updating phy_mask 0x%x for phy%d\n",
		    __FUNCTION__, phy->asd_port->phy_mask, sas_phy->id);
	asd_update_port_links(asd_ha, phy);
	spin_unlock_irqrestore(&asd_ha->asd_ports_lock, flags);
}

static void asd_deform_port(struct asd_ha_struct *asd_ha, struct asd_phy *phy)
{
	struct asd_port *port = phy->asd_port;
	struct asd_sas_phy *sas_phy = &phy->sas_phy;
	unsigned long flags;

	spin_lock_irqsave(&asd_ha->asd_ports_lock, flags);
	if (port) {
		port->num_phys--;
		port->phy_mask &= ~(1U << sas_phy->id);
		phy->asd_port = NULL;
	}
	spin_unlock_irqrestore(&asd_ha->asd_ports_lock, flags);
}

static inline void asd_bytes_dmaed_tasklet(struct asd_ascb *ascb,
					   struct done_list_struct *dl,
					   int edb_id, int phy_id)
{
	unsigned long flags;
	int edb_el = edb_id + ascb->edb_index;
	struct asd_dma_tok *edb = ascb->ha->seq.edb_arr[edb_el];
	struct asd_phy *phy = &ascb->ha->phys[phy_id];
	struct sas_ha_struct *sas_ha = phy->sas_phy.ha;
	u16 size = ((dl->status_block[3] & 7) << 8) | dl->status_block[2];

	size = min(size, (u16) sizeof(phy->frame_rcvd));

	spin_lock_irqsave(&phy->sas_phy.frame_rcvd_lock, flags);
	memcpy(phy->sas_phy.frame_rcvd, edb->vaddr, size);
	phy->sas_phy.frame_rcvd_size = size;
	asd_get_attached_sas_addr(phy, phy->sas_phy.attached_sas_addr);
	spin_unlock_irqrestore(&phy->sas_phy.frame_rcvd_lock, flags);
	asd_dump_frame_rcvd(phy, dl);
	asd_form_port(ascb->ha, phy);
	sas_ha->notify_port_event(&phy->sas_phy, PORTE_BYTES_DMAED);
}

static inline void asd_link_reset_err_tasklet(struct asd_ascb *ascb,
					      struct done_list_struct *dl,
					      int phy_id)
{
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct sas_ha_struct *sas_ha = &asd_ha->sas_ha;
	struct asd_sas_phy *sas_phy = sas_ha->sas_phy[phy_id];
	struct asd_phy *phy = &asd_ha->phys[phy_id];
	u8 lr_error = dl->status_block[1];
	u8 retries_left = dl->status_block[2];

	switch (lr_error) {
	case 0:
		ASD_DPRINTK("phy%d: Receive ID timer expired\n", phy_id);
		break;
	case 1:
		ASD_DPRINTK("phy%d: Loss of signal\n", phy_id);
		break;
	case 2:
		ASD_DPRINTK("phy%d: Loss of dword sync\n", phy_id);
		break;
	case 3:
		ASD_DPRINTK("phy%d: Receive FIS timeout\n", phy_id);
		break;
	default:
		ASD_DPRINTK("phy%d: unknown link reset error code: 0x%x\n",
			    phy_id, lr_error);
		break;
	}

	asd_turn_led(asd_ha, phy_id, 0);
	sas_phy_disconnected(sas_phy);
	asd_deform_port(asd_ha, phy);
	sas_ha->notify_port_event(sas_phy, PORTE_LINK_RESET_ERR);

	if (retries_left == 0) {
		int num = 1;
		struct asd_ascb *cp = asd_ascb_alloc_list(ascb->ha, &num,
							  GFP_ATOMIC);
		if (!cp) {
			asd_printk("%s: out of memory\n", __FUNCTION__);
			goto out;
		}
		ASD_DPRINTK("phy%d: retries:0 performing link reset seq\n",
			    phy_id);
		asd_build_control_phy(cp, phy_id, ENABLE_PHY);
		if (asd_post_ascb_list(ascb->ha, cp, 1) != 0)
			asd_ascb_free(cp);
	}
out:
	;
}

static inline void asd_primitive_rcvd_tasklet(struct asd_ascb *ascb,
					      struct done_list_struct *dl,
					      int phy_id)
{
	unsigned long flags;
	struct sas_ha_struct *sas_ha = &ascb->ha->sas_ha;
	struct asd_sas_phy *sas_phy = sas_ha->sas_phy[phy_id];
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct asd_phy *phy = &asd_ha->phys[phy_id];
	u8  reg  = dl->status_block[1];
	u32 cont = dl->status_block[2] << ((reg & 3)*8);

	reg &= ~3;
	switch (reg) {
	case LmPRMSTAT0BYTE0:
		switch (cont) {
		case LmBROADCH:
		case LmBROADRVCH0:
		case LmBROADRVCH1:
		case LmBROADSES:
			ASD_DPRINTK("phy%d: BROADCAST change received:%d\n",
				    phy_id, cont);
			spin_lock_irqsave(&sas_phy->sas_prim_lock, flags);
			sas_phy->sas_prim = ffs(cont);
			spin_unlock_irqrestore(&sas_phy->sas_prim_lock, flags);
			sas_ha->notify_port_event(sas_phy,PORTE_BROADCAST_RCVD);
			break;

		case LmUNKNOWNP:
			ASD_DPRINTK("phy%d: unknown BREAK\n", phy_id);
			break;

		default:
			ASD_DPRINTK("phy%d: primitive reg:0x%x, cont:0x%04x\n",
				    phy_id, reg, cont);
			break;
		}
		break;
	case LmPRMSTAT1BYTE0:
		switch (cont) {
		case LmHARDRST:
			ASD_DPRINTK("phy%d: HARD_RESET primitive rcvd\n",
				    phy_id);
			/* The sequencer disables all phys on that port.
			 * We have to re-enable the phys ourselves. */
			asd_deform_port(asd_ha, phy);
			sas_ha->notify_port_event(sas_phy, PORTE_HARD_RESET);
			break;

		default:
			ASD_DPRINTK("phy%d: primitive reg:0x%x, cont:0x%04x\n",
				    phy_id, reg, cont);
			break;
		}
		break;
	default:
		ASD_DPRINTK("unknown primitive register:0x%x\n",
			    dl->status_block[1]);
		break;
	}
}

/**
 * asd_invalidate_edb -- invalidate an EDB and if necessary post the ESCB
 * @ascb: pointer to Empty SCB
 * @edb_id: index [0,6] to the empty data buffer which is to be invalidated
 *
 * After an EDB has been invalidated, if all EDBs in this ESCB have been
 * invalidated, the ESCB is posted back to the sequencer.
 * Context is tasklet/IRQ.
 */
void asd_invalidate_edb(struct asd_ascb *ascb, int edb_id)
{
	struct asd_seq_data *seq = &ascb->ha->seq;
	struct empty_scb *escb = &ascb->scb->escb;
	struct sg_el     *eb   = &escb->eb[edb_id];
	struct asd_dma_tok *edb = seq->edb_arr[ascb->edb_index + edb_id];

	memset(edb->vaddr, 0, ASD_EDB_SIZE);
	eb->flags |= ELEMENT_NOT_VALID;
	escb->num_valid--;

	if (escb->num_valid == 0) {
		int i;
		/* ASD_DPRINTK("reposting escb: vaddr: 0x%p, "
			    "dma_handle: 0x%08llx, next: 0x%08llx, "
			    "index:%d, opcode:0x%02x\n",
			    ascb->dma_scb.vaddr,
			    (u64)ascb->dma_scb.dma_handle,
			    le64_to_cpu(ascb->scb->header.next_scb),
			    le16_to_cpu(ascb->scb->header.index),
			    ascb->scb->header.opcode);
		*/
		escb->num_valid = ASD_EDBS_PER_SCB;
		for (i = 0; i < ASD_EDBS_PER_SCB; i++)
			escb->eb[i].flags = 0;
		if (!list_empty(&ascb->list))
			list_del_init(&ascb->list);
		i = asd_post_escb_list(ascb->ha, ascb, 1);
		if (i)
			asd_printk("couldn't post escb, err:%d\n", i);
	}
}

static void escb_tasklet_complete(struct asd_ascb *ascb,
				  struct done_list_struct *dl)
{
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct sas_ha_struct *sas_ha = &asd_ha->sas_ha;
	int edb = (dl->opcode & DL_PHY_MASK) - 1; /* [0xc1,0xc7] -> [0,6] */
	u8  sb_opcode = dl->status_block[0];
	int phy_id = sb_opcode & DL_PHY_MASK;
	struct asd_sas_phy *sas_phy = sas_ha->sas_phy[phy_id];
	struct asd_phy *phy = &asd_ha->phys[phy_id];

	if (edb > 6 || edb < 0) {
		ASD_DPRINTK("edb is 0x%x! dl->opcode is 0x%x\n",
			    edb, dl->opcode);
		ASD_DPRINTK("sb_opcode : 0x%x, phy_id: 0x%x\n",
			    sb_opcode, phy_id);
		ASD_DPRINTK("escb: vaddr: 0x%p, "
			    "dma_handle: 0x%llx, next: 0x%llx, "
			    "index:%d, opcode:0x%02x\n",
			    ascb->dma_scb.vaddr,
			    (unsigned long long)ascb->dma_scb.dma_handle,
			    (unsigned long long)
			    le64_to_cpu(ascb->scb->header.next_scb),
			    le16_to_cpu(ascb->scb->header.index),
			    ascb->scb->header.opcode);
	}

	/* Catch these before we mask off the sb_opcode bits */
	switch (sb_opcode) {
	case REQ_TASK_ABORT: {
		struct asd_ascb *a, *b;
		u16 tc_abort;
		struct domain_device *failed_dev = NULL;

		ASD_DPRINTK("%s: REQ_TASK_ABORT, reason=0x%X\n",
			    __FUNCTION__, dl->status_block[3]);

		/*
		 * Find the task that caused the abort and abort it first.
		 * The sequencer won't put anything on the done list until
		 * that happens.
		 */
		tc_abort = *((u16*)(&dl->status_block[1]));
		tc_abort = le16_to_cpu(tc_abort);

		list_for_each_entry_safe(a, b, &asd_ha->seq.pend_q, list) {
			struct sas_task *task = ascb->uldd_task;

			if (task && a->tc_index == tc_abort) {
				failed_dev = task->dev;
				sas_task_abort(task);
				break;
			}
		}

		if (!failed_dev) {
			ASD_DPRINTK("%s: Can't find task (tc=%d) to abort!\n",
				    __FUNCTION__, tc_abort);
			goto out;
		}

		/*
		 * Now abort everything else for that device (hba?) so
		 * that the EH will wake up and do something.
		 */
		list_for_each_entry_safe(a, b, &asd_ha->seq.pend_q, list) {
			struct sas_task *task = ascb->uldd_task;

			if (task &&
			    task->dev == failed_dev &&
			    a->tc_index != tc_abort)
				sas_task_abort(task);
		}

		goto out;
	}
	case REQ_DEVICE_RESET: {
		struct asd_ascb *a;
		u16 conn_handle;
		unsigned long flags;
		struct sas_task *last_dev_task = NULL;

		conn_handle = *((u16*)(&dl->status_block[1]));
		conn_handle = le16_to_cpu(conn_handle);

		ASD_DPRINTK("%s: REQ_DEVICE_RESET, reason=0x%X\n", __FUNCTION__,
			    dl->status_block[3]);

		/* Find the last pending task for the device... */
		list_for_each_entry(a, &asd_ha->seq.pend_q, list) {
			u16 x;
			struct domain_device *dev;
			struct sas_task *task = a->uldd_task;

			if (!task)
				continue;
			dev = task->dev;

			x = (unsigned long)dev->lldd_dev;
			if (x == conn_handle)
				last_dev_task = task;
		}

		if (!last_dev_task) {
			ASD_DPRINTK("%s: Device reset for idle device %d?\n",
				    __FUNCTION__, conn_handle);
			goto out;
		}

		/* ...and set the reset flag */
		spin_lock_irqsave(&last_dev_task->task_state_lock, flags);
		last_dev_task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
		spin_unlock_irqrestore(&last_dev_task->task_state_lock, flags);

		/* Kill all pending tasks for the device */
		list_for_each_entry(a, &asd_ha->seq.pend_q, list) {
			u16 x;
			struct domain_device *dev;
			struct sas_task *task = a->uldd_task;

			if (!task)
				continue;
			dev = task->dev;

			x = (unsigned long)dev->lldd_dev;
			if (x == conn_handle)
				sas_task_abort(task);
		}

		goto out;
	}
	case SIGNAL_NCQ_ERROR:
		ASD_DPRINTK("%s: SIGNAL_NCQ_ERROR\n", __FUNCTION__);
		goto out;
	case CLEAR_NCQ_ERROR:
		ASD_DPRINTK("%s: CLEAR_NCQ_ERROR\n", __FUNCTION__);
		goto out;
	}

	sb_opcode &= ~DL_PHY_MASK;

	switch (sb_opcode) {
	case BYTES_DMAED:
		ASD_DPRINTK("%s: phy%d: BYTES_DMAED\n", __FUNCTION__, phy_id);
		asd_bytes_dmaed_tasklet(ascb, dl, edb, phy_id);
		break;
	case PRIMITIVE_RECVD:
		ASD_DPRINTK("%s: phy%d: PRIMITIVE_RECVD\n", __FUNCTION__,
			    phy_id);
		asd_primitive_rcvd_tasklet(ascb, dl, phy_id);
		break;
	case PHY_EVENT:
		ASD_DPRINTK("%s: phy%d: PHY_EVENT\n", __FUNCTION__, phy_id);
		asd_phy_event_tasklet(ascb, dl);
		break;
	case LINK_RESET_ERROR:
		ASD_DPRINTK("%s: phy%d: LINK_RESET_ERROR\n", __FUNCTION__,
			    phy_id);
		asd_link_reset_err_tasklet(ascb, dl, phy_id);
		break;
	case TIMER_EVENT:
		ASD_DPRINTK("%s: phy%d: TIMER_EVENT, lost dw sync\n",
			    __FUNCTION__, phy_id);
		asd_turn_led(asd_ha, phy_id, 0);
		/* the device is gone */
		sas_phy_disconnected(sas_phy);
		asd_deform_port(asd_ha, phy);
		sas_ha->notify_port_event(sas_phy, PORTE_TIMER_EVENT);
		break;
	default:
		ASD_DPRINTK("%s: phy%d: unknown event:0x%x\n", __FUNCTION__,
			    phy_id, sb_opcode);
		ASD_DPRINTK("edb is 0x%x! dl->opcode is 0x%x\n",
			    edb, dl->opcode);
		ASD_DPRINTK("sb_opcode : 0x%x, phy_id: 0x%x\n",
			    sb_opcode, phy_id);
		ASD_DPRINTK("escb: vaddr: 0x%p, "
			    "dma_handle: 0x%llx, next: 0x%llx, "
			    "index:%d, opcode:0x%02x\n",
			    ascb->dma_scb.vaddr,
			    (unsigned long long)ascb->dma_scb.dma_handle,
			    (unsigned long long)
			    le64_to_cpu(ascb->scb->header.next_scb),
			    le16_to_cpu(ascb->scb->header.index),
			    ascb->scb->header.opcode);

		break;
	}
out:
	asd_invalidate_edb(ascb, edb);
}

int asd_init_post_escbs(struct asd_ha_struct *asd_ha)
{
	struct asd_seq_data *seq = &asd_ha->seq;
	int i;

	for (i = 0; i < seq->num_escbs; i++)
		seq->escb_arr[i]->tasklet_complete = escb_tasklet_complete;

	ASD_DPRINTK("posting %d escbs\n", i);
	return asd_post_escb_list(asd_ha, seq->escb_arr[0], seq->num_escbs);
}

/* ---------- CONTROL PHY ---------- */

#define CONTROL_PHY_STATUS (CURRENT_DEVICE_PRESENT | CURRENT_OOB_DONE   \
			    | CURRENT_SPINUP_HOLD | CURRENT_GTO_TIMEOUT \
			    | CURRENT_OOB_ERROR)

/**
 * control_phy_tasklet_complete -- tasklet complete for CONTROL PHY ascb
 * @ascb: pointer to an ascb
 * @dl: pointer to the done list entry
 *
 * This function completes a CONTROL PHY scb and frees the ascb.
 * A note on LEDs:
 *  - an LED blinks if there is IO though it,
 *  - if a device is connected to the LED, it is lit,
 *  - if no device is connected to the LED, is is dimmed (off).
 */
static void control_phy_tasklet_complete(struct asd_ascb *ascb,
					 struct done_list_struct *dl)
{
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct scb *scb = ascb->scb;
	struct control_phy *control_phy = &scb->control_phy;
	u8 phy_id = control_phy->phy_id;
	struct asd_phy *phy = &ascb->ha->phys[phy_id];

	u8 status     = dl->status_block[0];
	u8 oob_status = dl->status_block[1];
	u8 oob_mode   = dl->status_block[2];
	/* u8 oob_signals= dl->status_block[3]; */

	if (status != 0) {
		ASD_DPRINTK("%s: phy%d status block opcode:0x%x\n",
			    __FUNCTION__, phy_id, status);
		goto out;
	}

	switch (control_phy->sub_func) {
	case DISABLE_PHY:
		asd_ha->hw_prof.enabled_phys &= ~(1 << phy_id);
		asd_turn_led(asd_ha, phy_id, 0);
		asd_control_led(asd_ha, phy_id, 0);
		ASD_DPRINTK("%s: disable phy%d\n", __FUNCTION__, phy_id);
		break;

	case ENABLE_PHY:
		asd_control_led(asd_ha, phy_id, 1);
		if (oob_status & CURRENT_OOB_DONE) {
			asd_ha->hw_prof.enabled_phys |= (1 << phy_id);
			get_lrate_mode(phy, oob_mode);
			asd_turn_led(asd_ha, phy_id, 1);
			ASD_DPRINTK("%s: phy%d, lrate:0x%x, proto:0x%x\n",
				    __FUNCTION__, phy_id,phy->sas_phy.linkrate,
				    phy->sas_phy.iproto);
		} else if (oob_status & CURRENT_SPINUP_HOLD) {
			asd_ha->hw_prof.enabled_phys |= (1 << phy_id);
			asd_turn_led(asd_ha, phy_id, 1);
			ASD_DPRINTK("%s: phy%d, spinup hold\n", __FUNCTION__,
				    phy_id);
		} else if (oob_status & CURRENT_ERR_MASK) {
			asd_turn_led(asd_ha, phy_id, 0);
			ASD_DPRINTK("%s: phy%d: error: oob status:0x%02x\n",
				    __FUNCTION__, phy_id, oob_status);
		} else if (oob_status & (CURRENT_HOT_PLUG_CNCT
					 | CURRENT_DEVICE_PRESENT))  {
			asd_ha->hw_prof.enabled_phys |= (1 << phy_id);
			asd_turn_led(asd_ha, phy_id, 1);
			ASD_DPRINTK("%s: phy%d: hot plug or device present\n",
				    __FUNCTION__, phy_id);
		} else {
			asd_ha->hw_prof.enabled_phys |= (1 << phy_id);
			asd_turn_led(asd_ha, phy_id, 0);
			ASD_DPRINTK("%s: phy%d: no device present: "
				    "oob_status:0x%x\n",
				    __FUNCTION__, phy_id, oob_status);
		}
		break;
	case RELEASE_SPINUP_HOLD:
	case PHY_NO_OP:
	case EXECUTE_HARD_RESET:
		ASD_DPRINTK("%s: phy%d: sub_func:0x%x\n", __FUNCTION__,
			    phy_id, control_phy->sub_func);
		/* XXX finish */
		break;
	default:
		ASD_DPRINTK("%s: phy%d: sub_func:0x%x?\n", __FUNCTION__,
			    phy_id, control_phy->sub_func);
		break;
	}
out:
	asd_ascb_free(ascb);
}

static inline void set_speed_mask(u8 *speed_mask, struct asd_phy_desc *pd)
{
	/* disable all speeds, then enable defaults */
	*speed_mask = SAS_SPEED_60_DIS | SAS_SPEED_30_DIS | SAS_SPEED_15_DIS
		| SATA_SPEED_30_DIS | SATA_SPEED_15_DIS;

	switch (pd->max_sas_lrate) {
	case SAS_LINK_RATE_6_0_GBPS:
		*speed_mask &= ~SAS_SPEED_60_DIS;
	default:
	case SAS_LINK_RATE_3_0_GBPS:
		*speed_mask &= ~SAS_SPEED_30_DIS;
	case SAS_LINK_RATE_1_5_GBPS:
		*speed_mask &= ~SAS_SPEED_15_DIS;
	}

	switch (pd->min_sas_lrate) {
	case SAS_LINK_RATE_6_0_GBPS:
		*speed_mask |= SAS_SPEED_30_DIS;
	case SAS_LINK_RATE_3_0_GBPS:
		*speed_mask |= SAS_SPEED_15_DIS;
	default:
	case SAS_LINK_RATE_1_5_GBPS:
		/* nothing to do */
		;
	}

	switch (pd->max_sata_lrate) {
	case SAS_LINK_RATE_3_0_GBPS:
		*speed_mask &= ~SATA_SPEED_30_DIS;
	default:
	case SAS_LINK_RATE_1_5_GBPS:
		*speed_mask &= ~SATA_SPEED_15_DIS;
	}

	switch (pd->min_sata_lrate) {
	case SAS_LINK_RATE_3_0_GBPS:
		*speed_mask |= SATA_SPEED_15_DIS;
	default:
	case SAS_LINK_RATE_1_5_GBPS:
		/* nothing to do */
		;
	}
}

/**
 * asd_build_control_phy -- build a CONTROL PHY SCB
 * @ascb: pointer to an ascb
 * @phy_id: phy id to control, integer
 * @subfunc: subfunction, what to actually to do the phy
 *
 * This function builds a CONTROL PHY scb.  No allocation of any kind
 * is performed. @ascb is allocated with the list function.
 * The caller can override the ascb->tasklet_complete to point
 * to its own callback function.  It must call asd_ascb_free()
 * at its tasklet complete function.
 * See the default implementation.
 */
void asd_build_control_phy(struct asd_ascb *ascb, int phy_id, u8 subfunc)
{
	struct asd_phy *phy = &ascb->ha->phys[phy_id];
	struct scb *scb = ascb->scb;
	struct control_phy *control_phy = &scb->control_phy;

	scb->header.opcode = CONTROL_PHY;
	control_phy->phy_id = (u8) phy_id;
	control_phy->sub_func = subfunc;

	switch (subfunc) {
	case EXECUTE_HARD_RESET:  /* 0x81 */
	case ENABLE_PHY:          /* 0x01 */
		/* decide hot plug delay */
		control_phy->hot_plug_delay = HOTPLUG_DELAY_TIMEOUT;

		/* decide speed mask */
		set_speed_mask(&control_phy->speed_mask, phy->phy_desc);

		/* initiator port settings are in the hi nibble */
		if (phy->sas_phy.role == PHY_ROLE_INITIATOR)
			control_phy->port_type = SAS_PROTO_ALL << 4;
		else if (phy->sas_phy.role == PHY_ROLE_TARGET)
			control_phy->port_type = SAS_PROTO_ALL;
		else
			control_phy->port_type =
				(SAS_PROTO_ALL << 4) | SAS_PROTO_ALL;

		/* link reset retries, this should be nominal */
		control_phy->link_reset_retries = 10;

	case RELEASE_SPINUP_HOLD: /* 0x02 */
		/* decide the func_mask */
		control_phy->func_mask = FUNCTION_MASK_DEFAULT;
		if (phy->phy_desc->flags & ASD_SATA_SPINUP_HOLD)
			control_phy->func_mask &= ~SPINUP_HOLD_DIS;
		else
			control_phy->func_mask |= SPINUP_HOLD_DIS;
	}

	control_phy->conn_handle = cpu_to_le16(0xFFFF);

	ascb->tasklet_complete = control_phy_tasklet_complete;
}

/* ---------- INITIATE LINK ADM TASK ---------- */

static void link_adm_tasklet_complete(struct asd_ascb *ascb,
				      struct done_list_struct *dl)
{
	u8 opcode = dl->opcode;
	struct initiate_link_adm *link_adm = &ascb->scb->link_adm;
	u8 phy_id = link_adm->phy_id;

	if (opcode != TC_NO_ERROR) {
		asd_printk("phy%d: link adm task 0x%x completed with error "
			   "0x%x\n", phy_id, link_adm->sub_func, opcode);
	}
	ASD_DPRINTK("phy%d: link adm task 0x%x: 0x%x\n",
		    phy_id, link_adm->sub_func, opcode);

	asd_ascb_free(ascb);
}

void asd_build_initiate_link_adm_task(struct asd_ascb *ascb, int phy_id,
				      u8 subfunc)
{
	struct scb *scb = ascb->scb;
	struct initiate_link_adm *link_adm = &scb->link_adm;

	scb->header.opcode = INITIATE_LINK_ADM_TASK;

	link_adm->phy_id = phy_id;
	link_adm->sub_func = subfunc;
	link_adm->conn_handle = cpu_to_le16(0xFFFF);

	ascb->tasklet_complete = link_adm_tasklet_complete;
}

/* ---------- SCB timer ---------- */

/**
 * asd_ascb_timedout -- called when a pending SCB's timer has expired
 * @data: unsigned long, a pointer to the ascb in question
 *
 * This is the default timeout function which does the most necessary.
 * Upper layers can implement their own timeout function, say to free
 * resources they have with this SCB, and then call this one at the
 * end of their timeout function.  To do this, one should initialize
 * the ascb->timer.{function, data, expires} prior to calling the post
 * funcion.  The timer is started by the post function.
 */
void asd_ascb_timedout(unsigned long data)
{
	struct asd_ascb *ascb = (void *) data;
	struct asd_seq_data *seq = &ascb->ha->seq;
	unsigned long flags;

	ASD_DPRINTK("scb:0x%x timed out\n", ascb->scb->header.opcode);

	spin_lock_irqsave(&seq->pend_q_lock, flags);
	seq->pending--;
	list_del_init(&ascb->list);
	spin_unlock_irqrestore(&seq->pend_q_lock, flags);

	asd_ascb_free(ascb);
}

/* ---------- CONTROL PHY ---------- */

/* Given the spec value, return a driver value. */
static const int phy_func_table[] = {
	[PHY_FUNC_NOP]        = PHY_NO_OP,
	[PHY_FUNC_LINK_RESET] = ENABLE_PHY,
	[PHY_FUNC_HARD_RESET] = EXECUTE_HARD_RESET,
	[PHY_FUNC_DISABLE]    = DISABLE_PHY,
	[PHY_FUNC_RELEASE_SPINUP_HOLD] = RELEASE_SPINUP_HOLD,
};

int asd_control_phy(struct asd_sas_phy *phy, enum phy_func func, void *arg)
{
	struct asd_ha_struct *asd_ha = phy->ha->lldd_ha;
	struct asd_phy_desc *pd = asd_ha->phys[phy->id].phy_desc;
	struct asd_ascb *ascb;
	struct sas_phy_linkrates *rates;
	int res = 1;

	switch (func) {
	case PHY_FUNC_CLEAR_ERROR_LOG:
		return -ENOSYS;
	case PHY_FUNC_SET_LINK_RATE:
		rates = arg;
		if (rates->minimum_linkrate) {
			pd->min_sas_lrate = rates->minimum_linkrate;
			pd->min_sata_lrate = rates->minimum_linkrate;
		}
		if (rates->maximum_linkrate) {
			pd->max_sas_lrate = rates->maximum_linkrate;
			pd->max_sata_lrate = rates->maximum_linkrate;
		}
		func = PHY_FUNC_LINK_RESET;
		break;
	default:
		break;
	}

	ascb = asd_ascb_alloc_list(asd_ha, &res, GFP_KERNEL);
	if (!ascb)
		return -ENOMEM;

	asd_build_control_phy(ascb, phy->id, phy_func_table[func]);
	res = asd_post_ascb_list(asd_ha, ascb , 1);
	if (res)
		asd_ascb_free(ascb);

	return res;
}