summaryrefslogtreecommitdiff
path: root/drivers/s390/crypto/ap_queue.c
blob: 6e4e8d324a6def068638e3418b8e9beef70a098f (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
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright IBM Corp. 2016, 2023
 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 *
 * Adjunct processor bus, queue related code.
 */

#define KMSG_COMPONENT "ap"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/init.h>
#include <linux/slab.h>
#include <asm/facility.h>

#include "ap_bus.h"
#include "ap_debug.h"

static void __ap_flush_queue(struct ap_queue *aq);

/*
 * some AP queue helper functions
 */

static inline bool ap_q_supports_bind(struct ap_queue *aq)
{
	return aq->card->hwinfo.ep11 || aq->card->hwinfo.accel;
}

static inline bool ap_q_supports_assoc(struct ap_queue *aq)
{
	return aq->card->hwinfo.ep11;
}

static inline bool ap_q_needs_bind(struct ap_queue *aq)
{
	return ap_q_supports_bind(aq) && ap_sb_available();
}

/**
 * ap_queue_enable_irq(): Enable interrupt support on this AP queue.
 * @aq: The AP queue
 * @ind: the notification indicator byte
 *
 * Enables interruption on AP queue via ap_aqic(). Based on the return
 * value it waits a while and tests the AP queue if interrupts
 * have been switched on using ap_test_queue().
 */
static int ap_queue_enable_irq(struct ap_queue *aq, void *ind)
{
	union ap_qirq_ctrl qirqctrl = { .value = 0 };
	struct ap_queue_status status;

	qirqctrl.ir = 1;
	qirqctrl.isc = AP_ISC;
	status = ap_aqic(aq->qid, qirqctrl, virt_to_phys(ind));
	if (status.async)
		return -EPERM;
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
	case AP_RESPONSE_OTHERWISE_CHANGED:
		return 0;
	case AP_RESPONSE_Q_NOT_AVAIL:
	case AP_RESPONSE_DECONFIGURED:
	case AP_RESPONSE_CHECKSTOPPED:
	case AP_RESPONSE_INVALID_ADDRESS:
		pr_err("Registering adapter interrupts for AP device %02x.%04x failed\n",
		       AP_QID_CARD(aq->qid),
		       AP_QID_QUEUE(aq->qid));
		return -EOPNOTSUPP;
	case AP_RESPONSE_RESET_IN_PROGRESS:
	case AP_RESPONSE_BUSY:
	default:
		return -EBUSY;
	}
}

/**
 * __ap_send(): Send message to adjunct processor queue.
 * @qid: The AP queue number
 * @psmid: The program supplied message identifier
 * @msg: The message text
 * @msglen: The message length
 * @special: Special Bit
 *
 * Returns AP queue status structure.
 * Condition code 1 on NQAP can't happen because the L bit is 1.
 * Condition code 2 on NQAP also means the send is incomplete,
 * because a segment boundary was reached. The NQAP is repeated.
 */
static inline struct ap_queue_status
__ap_send(ap_qid_t qid, unsigned long psmid, void *msg, size_t msglen,
	  int special)
{
	if (special)
		qid |= 0x400000UL;
	return ap_nqap(qid, psmid, msg, msglen);
}

/* State machine definitions and helpers */

static enum ap_sm_wait ap_sm_nop(struct ap_queue *aq)
{
	return AP_SM_WAIT_NONE;
}

/**
 * ap_sm_recv(): Receive pending reply messages from an AP queue but do
 *	not change the state of the device.
 * @aq: pointer to the AP queue
 *
 * Returns AP_SM_WAIT_NONE, AP_SM_WAIT_AGAIN, or AP_SM_WAIT_INTERRUPT
 */
static struct ap_queue_status ap_sm_recv(struct ap_queue *aq)
{
	struct ap_queue_status status;
	struct ap_message *ap_msg;
	bool found = false;
	size_t reslen;
	unsigned long resgr0 = 0;
	int parts = 0;

	/*
	 * DQAP loop until response code and resgr0 indicate that
	 * the msg is totally received. As we use the very same buffer
	 * the msg is overwritten with each invocation. That's intended
	 * and the receiver of the msg is informed with a msg rc code
	 * of EMSGSIZE in such a case.
	 */
	do {
		status = ap_dqap(aq->qid, &aq->reply->psmid,
				 aq->reply->msg, aq->reply->bufsize,
				 &aq->reply->len, &reslen, &resgr0);
		parts++;
	} while (status.response_code == 0xFF && resgr0 != 0);

	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		print_hex_dump_debug("aprpl: ", DUMP_PREFIX_ADDRESS, 16, 1,
				     aq->reply->msg, aq->reply->len, false);
		aq->queue_count = max_t(int, 0, aq->queue_count - 1);
		if (!status.queue_empty && !aq->queue_count)
			aq->queue_count++;
		if (aq->queue_count > 0)
			mod_timer(&aq->timeout,
				  jiffies + aq->request_timeout);
		list_for_each_entry(ap_msg, &aq->pendingq, list) {
			if (ap_msg->psmid != aq->reply->psmid)
				continue;
			list_del_init(&ap_msg->list);
			aq->pendingq_count--;
			if (parts > 1) {
				ap_msg->rc = -EMSGSIZE;
				ap_msg->receive(aq, ap_msg, NULL);
			} else {
				ap_msg->receive(aq, ap_msg, aq->reply);
			}
			found = true;
			break;
		}
		if (!found) {
			AP_DBF_WARN("%s unassociated reply psmid=0x%016lx on 0x%02x.%04x\n",
				    __func__, aq->reply->psmid,
				    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		}
		fallthrough;
	case AP_RESPONSE_NO_PENDING_REPLY:
		if (!status.queue_empty || aq->queue_count <= 0)
			break;
		/* The card shouldn't forget requests but who knows. */
		aq->queue_count = 0;
		list_splice_init(&aq->pendingq, &aq->requestq);
		aq->requestq_count += aq->pendingq_count;
		pr_debug("%s queue 0x%02x.%04x rescheduled %d reqs (new req %d)\n",
			 __func__, AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid),
			 aq->pendingq_count, aq->requestq_count);
		aq->pendingq_count = 0;
		break;
	default:
		break;
	}
	return status;
}

/**
 * ap_sm_read(): Receive pending reply messages from an AP queue.
 * @aq: pointer to the AP queue
 *
 * Returns AP_SM_WAIT_NONE, AP_SM_WAIT_AGAIN, or AP_SM_WAIT_INTERRUPT
 */
static enum ap_sm_wait ap_sm_read(struct ap_queue *aq)
{
	struct ap_queue_status status;

	if (!aq->reply)
		return AP_SM_WAIT_NONE;
	status = ap_sm_recv(aq);
	if (status.async)
		return AP_SM_WAIT_NONE;
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		if (aq->queue_count > 0) {
			aq->sm_state = AP_SM_STATE_WORKING;
			return AP_SM_WAIT_AGAIN;
		}
		aq->sm_state = AP_SM_STATE_IDLE;
		break;
	case AP_RESPONSE_NO_PENDING_REPLY:
		if (aq->queue_count > 0)
			return status.irq_enabled ?
				AP_SM_WAIT_INTERRUPT : AP_SM_WAIT_HIGH_TIMEOUT;
		aq->sm_state = AP_SM_STATE_IDLE;
		break;
	default:
		aq->dev_state = AP_DEV_STATE_ERROR;
		aq->last_err_rc = status.response_code;
		AP_DBF_WARN("%s RC 0x%02x on 0x%02x.%04x -> AP_DEV_STATE_ERROR\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return AP_SM_WAIT_NONE;
	}
	/* Check and maybe enable irq support (again) on this queue */
	if (!status.irq_enabled && status.queue_empty) {
		void *lsi_ptr = ap_airq_ptr();

		if (lsi_ptr && ap_queue_enable_irq(aq, lsi_ptr) == 0) {
			aq->sm_state = AP_SM_STATE_SETIRQ_WAIT;
			return AP_SM_WAIT_AGAIN;
		}
	}
	return AP_SM_WAIT_NONE;
}

/**
 * ap_sm_write(): Send messages from the request queue to an AP queue.
 * @aq: pointer to the AP queue
 *
 * Returns AP_SM_WAIT_NONE, AP_SM_WAIT_AGAIN, or AP_SM_WAIT_INTERRUPT
 */
static enum ap_sm_wait ap_sm_write(struct ap_queue *aq)
{
	struct ap_queue_status status;
	struct ap_message *ap_msg;
	ap_qid_t qid = aq->qid;

	if (aq->requestq_count <= 0)
		return AP_SM_WAIT_NONE;

	/* Start the next request on the queue. */
	ap_msg = list_entry(aq->requestq.next, struct ap_message, list);
	print_hex_dump_debug("apreq: ", DUMP_PREFIX_ADDRESS, 16, 1,
			     ap_msg->msg, ap_msg->len, false);
	status = __ap_send(qid, ap_msg->psmid,
			   ap_msg->msg, ap_msg->len,
			   ap_msg->flags & AP_MSG_FLAG_SPECIAL);
	if (status.async)
		return AP_SM_WAIT_NONE;
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		aq->queue_count = max_t(int, 1, aq->queue_count + 1);
		if (aq->queue_count == 1)
			mod_timer(&aq->timeout, jiffies + aq->request_timeout);
		list_move_tail(&ap_msg->list, &aq->pendingq);
		aq->requestq_count--;
		aq->pendingq_count++;
		if (aq->queue_count < aq->card->hwinfo.qd) {
			aq->sm_state = AP_SM_STATE_WORKING;
			return AP_SM_WAIT_AGAIN;
		}
		fallthrough;
	case AP_RESPONSE_Q_FULL:
		aq->sm_state = AP_SM_STATE_QUEUE_FULL;
		return status.irq_enabled ?
			AP_SM_WAIT_INTERRUPT : AP_SM_WAIT_HIGH_TIMEOUT;
	case AP_RESPONSE_RESET_IN_PROGRESS:
		aq->sm_state = AP_SM_STATE_RESET_WAIT;
		return AP_SM_WAIT_LOW_TIMEOUT;
	case AP_RESPONSE_INVALID_DOMAIN:
		AP_DBF_WARN("%s RESPONSE_INVALID_DOMAIN on NQAP\n", __func__);
		fallthrough;
	case AP_RESPONSE_MESSAGE_TOO_BIG:
	case AP_RESPONSE_REQ_FAC_NOT_INST:
		list_del_init(&ap_msg->list);
		aq->requestq_count--;
		ap_msg->rc = -EINVAL;
		ap_msg->receive(aq, ap_msg, NULL);
		return AP_SM_WAIT_AGAIN;
	default:
		aq->dev_state = AP_DEV_STATE_ERROR;
		aq->last_err_rc = status.response_code;
		AP_DBF_WARN("%s RC 0x%02x on 0x%02x.%04x -> AP_DEV_STATE_ERROR\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return AP_SM_WAIT_NONE;
	}
}

/**
 * ap_sm_read_write(): Send and receive messages to/from an AP queue.
 * @aq: pointer to the AP queue
 *
 * Returns AP_SM_WAIT_NONE, AP_SM_WAIT_AGAIN, or AP_SM_WAIT_INTERRUPT
 */
static enum ap_sm_wait ap_sm_read_write(struct ap_queue *aq)
{
	return min(ap_sm_read(aq), ap_sm_write(aq));
}

/**
 * ap_sm_reset(): Reset an AP queue.
 * @aq: The AP queue
 *
 * Submit the Reset command to an AP queue.
 */
static enum ap_sm_wait ap_sm_reset(struct ap_queue *aq)
{
	struct ap_queue_status status;

	status = ap_rapq(aq->qid, aq->rapq_fbit);
	if (status.async)
		return AP_SM_WAIT_NONE;
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
	case AP_RESPONSE_RESET_IN_PROGRESS:
		aq->sm_state = AP_SM_STATE_RESET_WAIT;
		aq->rapq_fbit = 0;
		return AP_SM_WAIT_LOW_TIMEOUT;
	default:
		aq->dev_state = AP_DEV_STATE_ERROR;
		aq->last_err_rc = status.response_code;
		AP_DBF_WARN("%s RC 0x%02x on 0x%02x.%04x -> AP_DEV_STATE_ERROR\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return AP_SM_WAIT_NONE;
	}
}

/**
 * ap_sm_reset_wait(): Test queue for completion of the reset operation
 * @aq: pointer to the AP queue
 *
 * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
 */
static enum ap_sm_wait ap_sm_reset_wait(struct ap_queue *aq)
{
	struct ap_queue_status status;
	struct ap_tapq_hwinfo hwinfo;
	void *lsi_ptr;

	/* Get the status with TAPQ */
	status = ap_test_queue(aq->qid, 1, &hwinfo);

	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		aq->se_bstate = hwinfo.bs;
		lsi_ptr = ap_airq_ptr();
		if (lsi_ptr && ap_queue_enable_irq(aq, lsi_ptr) == 0)
			aq->sm_state = AP_SM_STATE_SETIRQ_WAIT;
		else
			aq->sm_state = (aq->queue_count > 0) ?
				AP_SM_STATE_WORKING : AP_SM_STATE_IDLE;
		return AP_SM_WAIT_AGAIN;
	case AP_RESPONSE_BUSY:
	case AP_RESPONSE_RESET_IN_PROGRESS:
		return AP_SM_WAIT_LOW_TIMEOUT;
	case AP_RESPONSE_Q_NOT_AVAIL:
	case AP_RESPONSE_DECONFIGURED:
	case AP_RESPONSE_CHECKSTOPPED:
	default:
		aq->dev_state = AP_DEV_STATE_ERROR;
		aq->last_err_rc = status.response_code;
		AP_DBF_WARN("%s RC 0x%02x on 0x%02x.%04x -> AP_DEV_STATE_ERROR\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return AP_SM_WAIT_NONE;
	}
}

/**
 * ap_sm_setirq_wait(): Test queue for completion of the irq enablement
 * @aq: pointer to the AP queue
 *
 * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
 */
static enum ap_sm_wait ap_sm_setirq_wait(struct ap_queue *aq)
{
	struct ap_queue_status status;

	if (aq->queue_count > 0 && aq->reply)
		/* Try to read a completed message and get the status */
		status = ap_sm_recv(aq);
	else
		/* Get the status with TAPQ */
		status = ap_tapq(aq->qid, NULL);

	if (status.irq_enabled == 1) {
		/* Irqs are now enabled */
		aq->sm_state = (aq->queue_count > 0) ?
			AP_SM_STATE_WORKING : AP_SM_STATE_IDLE;
	}

	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		if (aq->queue_count > 0)
			return AP_SM_WAIT_AGAIN;
		fallthrough;
	case AP_RESPONSE_NO_PENDING_REPLY:
		return AP_SM_WAIT_LOW_TIMEOUT;
	default:
		aq->dev_state = AP_DEV_STATE_ERROR;
		aq->last_err_rc = status.response_code;
		AP_DBF_WARN("%s RC 0x%02x on 0x%02x.%04x -> AP_DEV_STATE_ERROR\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return AP_SM_WAIT_NONE;
	}
}

/**
 * ap_sm_assoc_wait(): Test queue for completion of a pending
 *		       association request.
 * @aq: pointer to the AP queue
 */
static enum ap_sm_wait ap_sm_assoc_wait(struct ap_queue *aq)
{
	struct ap_queue_status status;
	struct ap_tapq_hwinfo hwinfo;

	status = ap_test_queue(aq->qid, 1, &hwinfo);
	/* handle asynchronous error on this queue */
	if (status.async && status.response_code) {
		aq->dev_state = AP_DEV_STATE_ERROR;
		aq->last_err_rc = status.response_code;
		AP_DBF_WARN("%s asynch RC 0x%02x on 0x%02x.%04x -> AP_DEV_STATE_ERROR\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return AP_SM_WAIT_NONE;
	}
	if (status.response_code > AP_RESPONSE_BUSY) {
		aq->dev_state = AP_DEV_STATE_ERROR;
		aq->last_err_rc = status.response_code;
		AP_DBF_WARN("%s RC 0x%02x on 0x%02x.%04x -> AP_DEV_STATE_ERROR\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return AP_SM_WAIT_NONE;
	}

	/* update queue's SE bind state */
	aq->se_bstate = hwinfo.bs;

	/* check bs bits */
	switch (hwinfo.bs) {
	case AP_BS_Q_USABLE:
		/* association is through */
		aq->sm_state = AP_SM_STATE_IDLE;
		pr_debug("%s queue 0x%02x.%04x associated with %u\n",
			 __func__, AP_QID_CARD(aq->qid),
			 AP_QID_QUEUE(aq->qid), aq->assoc_idx);
		return AP_SM_WAIT_NONE;
	case AP_BS_Q_USABLE_NO_SECURE_KEY:
		/* association still pending */
		return AP_SM_WAIT_LOW_TIMEOUT;
	default:
		/* reset from 'outside' happened or no idea at all */
		aq->assoc_idx = ASSOC_IDX_INVALID;
		aq->dev_state = AP_DEV_STATE_ERROR;
		aq->last_err_rc = status.response_code;
		AP_DBF_WARN("%s bs 0x%02x on 0x%02x.%04x -> AP_DEV_STATE_ERROR\n",
			    __func__, hwinfo.bs,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return AP_SM_WAIT_NONE;
	}
}

/*
 * AP state machine jump table
 */
static ap_func_t *ap_jumptable[NR_AP_SM_STATES][NR_AP_SM_EVENTS] = {
	[AP_SM_STATE_RESET_START] = {
		[AP_SM_EVENT_POLL] = ap_sm_reset,
		[AP_SM_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_SM_STATE_RESET_WAIT] = {
		[AP_SM_EVENT_POLL] = ap_sm_reset_wait,
		[AP_SM_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_SM_STATE_SETIRQ_WAIT] = {
		[AP_SM_EVENT_POLL] = ap_sm_setirq_wait,
		[AP_SM_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_SM_STATE_IDLE] = {
		[AP_SM_EVENT_POLL] = ap_sm_write,
		[AP_SM_EVENT_TIMEOUT] = ap_sm_nop,
	},
	[AP_SM_STATE_WORKING] = {
		[AP_SM_EVENT_POLL] = ap_sm_read_write,
		[AP_SM_EVENT_TIMEOUT] = ap_sm_reset,
	},
	[AP_SM_STATE_QUEUE_FULL] = {
		[AP_SM_EVENT_POLL] = ap_sm_read,
		[AP_SM_EVENT_TIMEOUT] = ap_sm_reset,
	},
	[AP_SM_STATE_ASSOC_WAIT] = {
		[AP_SM_EVENT_POLL] = ap_sm_assoc_wait,
		[AP_SM_EVENT_TIMEOUT] = ap_sm_reset,
	},
};

enum ap_sm_wait ap_sm_event(struct ap_queue *aq, enum ap_sm_event event)
{
	if (aq->config && !aq->chkstop &&
	    aq->dev_state > AP_DEV_STATE_UNINITIATED)
		return ap_jumptable[aq->sm_state][event](aq);
	else
		return AP_SM_WAIT_NONE;
}

enum ap_sm_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_sm_event event)
{
	enum ap_sm_wait wait;

	while ((wait = ap_sm_event(aq, event)) == AP_SM_WAIT_AGAIN)
		;
	return wait;
}

/*
 * AP queue related attributes.
 */
static ssize_t request_count_show(struct device *dev,
				  struct device_attribute *attr,
				  char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	bool valid = false;
	u64 req_cnt;

	spin_lock_bh(&aq->lock);
	if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
		req_cnt = aq->total_request_count;
		valid = true;
	}
	spin_unlock_bh(&aq->lock);

	if (valid)
		return sysfs_emit(buf, "%llu\n", req_cnt);
	else
		return sysfs_emit(buf, "-\n");
}

static ssize_t request_count_store(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct ap_queue *aq = to_ap_queue(dev);

	spin_lock_bh(&aq->lock);
	aq->total_request_count = 0;
	spin_unlock_bh(&aq->lock);

	return count;
}

static DEVICE_ATTR_RW(request_count);

static ssize_t requestq_count_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	unsigned int reqq_cnt = 0;

	spin_lock_bh(&aq->lock);
	if (aq->dev_state > AP_DEV_STATE_UNINITIATED)
		reqq_cnt = aq->requestq_count;
	spin_unlock_bh(&aq->lock);
	return sysfs_emit(buf, "%d\n", reqq_cnt);
}

static DEVICE_ATTR_RO(requestq_count);

static ssize_t pendingq_count_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	unsigned int penq_cnt = 0;

	spin_lock_bh(&aq->lock);
	if (aq->dev_state > AP_DEV_STATE_UNINITIATED)
		penq_cnt = aq->pendingq_count;
	spin_unlock_bh(&aq->lock);
	return sysfs_emit(buf, "%d\n", penq_cnt);
}

static DEVICE_ATTR_RO(pendingq_count);

static ssize_t reset_show(struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	int rc = 0;

	spin_lock_bh(&aq->lock);
	switch (aq->sm_state) {
	case AP_SM_STATE_RESET_START:
	case AP_SM_STATE_RESET_WAIT:
		rc = sysfs_emit(buf, "Reset in progress.\n");
		break;
	case AP_SM_STATE_WORKING:
	case AP_SM_STATE_QUEUE_FULL:
		rc = sysfs_emit(buf, "Reset Timer armed.\n");
		break;
	default:
		rc = sysfs_emit(buf, "No Reset Timer set.\n");
	}
	spin_unlock_bh(&aq->lock);
	return rc;
}

static ssize_t reset_store(struct device *dev,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct ap_queue *aq = to_ap_queue(dev);

	spin_lock_bh(&aq->lock);
	__ap_flush_queue(aq);
	aq->sm_state = AP_SM_STATE_RESET_START;
	ap_wait(ap_sm_event(aq, AP_SM_EVENT_POLL));
	spin_unlock_bh(&aq->lock);

	AP_DBF_INFO("%s reset queue=%02x.%04x triggered by user\n",
		    __func__, AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));

	return count;
}

static DEVICE_ATTR_RW(reset);

static ssize_t interrupt_show(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	struct ap_queue_status status;
	int rc = 0;

	spin_lock_bh(&aq->lock);
	if (aq->sm_state == AP_SM_STATE_SETIRQ_WAIT) {
		rc = sysfs_emit(buf, "Enable Interrupt pending.\n");
	} else {
		status = ap_tapq(aq->qid, NULL);
		if (status.irq_enabled)
			rc = sysfs_emit(buf, "Interrupts enabled.\n");
		else
			rc = sysfs_emit(buf, "Interrupts disabled.\n");
	}
	spin_unlock_bh(&aq->lock);

	return rc;
}

static DEVICE_ATTR_RO(interrupt);

static ssize_t config_show(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	int rc;

	spin_lock_bh(&aq->lock);
	rc = sysfs_emit(buf, "%d\n", aq->config ? 1 : 0);
	spin_unlock_bh(&aq->lock);
	return rc;
}

static DEVICE_ATTR_RO(config);

static ssize_t chkstop_show(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	int rc;

	spin_lock_bh(&aq->lock);
	rc = sysfs_emit(buf, "%d\n", aq->chkstop ? 1 : 0);
	spin_unlock_bh(&aq->lock);
	return rc;
}

static DEVICE_ATTR_RO(chkstop);

static ssize_t ap_functions_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	struct ap_queue_status status;
	struct ap_tapq_hwinfo hwinfo;

	status = ap_test_queue(aq->qid, 1, &hwinfo);
	if (status.response_code > AP_RESPONSE_BUSY) {
		pr_debug("%s RC 0x%02x on tapq(0x%02x.%04x)\n",
			 __func__, status.response_code,
			 AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return -EIO;
	}

	return sysfs_emit(buf, "0x%08X\n", hwinfo.fac);
}

static DEVICE_ATTR_RO(ap_functions);

#ifdef CONFIG_ZCRYPT_DEBUG
static ssize_t states_show(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	int rc = 0;

	spin_lock_bh(&aq->lock);
	/* queue device state */
	switch (aq->dev_state) {
	case AP_DEV_STATE_UNINITIATED:
		rc = sysfs_emit(buf, "UNINITIATED\n");
		break;
	case AP_DEV_STATE_OPERATING:
		rc = sysfs_emit(buf, "OPERATING");
		break;
	case AP_DEV_STATE_SHUTDOWN:
		rc = sysfs_emit(buf, "SHUTDOWN");
		break;
	case AP_DEV_STATE_ERROR:
		rc = sysfs_emit(buf, "ERROR");
		break;
	default:
		rc = sysfs_emit(buf, "UNKNOWN");
	}
	/* state machine state */
	if (aq->dev_state) {
		switch (aq->sm_state) {
		case AP_SM_STATE_RESET_START:
			rc += sysfs_emit_at(buf, rc, " [RESET_START]\n");
			break;
		case AP_SM_STATE_RESET_WAIT:
			rc += sysfs_emit_at(buf, rc, " [RESET_WAIT]\n");
			break;
		case AP_SM_STATE_SETIRQ_WAIT:
			rc += sysfs_emit_at(buf, rc, " [SETIRQ_WAIT]\n");
			break;
		case AP_SM_STATE_IDLE:
			rc += sysfs_emit_at(buf, rc, " [IDLE]\n");
			break;
		case AP_SM_STATE_WORKING:
			rc += sysfs_emit_at(buf, rc, " [WORKING]\n");
			break;
		case AP_SM_STATE_QUEUE_FULL:
			rc += sysfs_emit_at(buf, rc, " [FULL]\n");
			break;
		case AP_SM_STATE_ASSOC_WAIT:
			rc += sysfs_emit_at(buf, rc, " [ASSOC_WAIT]\n");
			break;
		default:
			rc += sysfs_emit_at(buf, rc, " [UNKNOWN]\n");
		}
	}
	spin_unlock_bh(&aq->lock);

	return rc;
}
static DEVICE_ATTR_RO(states);

static ssize_t last_err_rc_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	int rc;

	spin_lock_bh(&aq->lock);
	rc = aq->last_err_rc;
	spin_unlock_bh(&aq->lock);

	switch (rc) {
	case AP_RESPONSE_NORMAL:
		return sysfs_emit(buf, "NORMAL\n");
	case AP_RESPONSE_Q_NOT_AVAIL:
		return sysfs_emit(buf, "Q_NOT_AVAIL\n");
	case AP_RESPONSE_RESET_IN_PROGRESS:
		return sysfs_emit(buf, "RESET_IN_PROGRESS\n");
	case AP_RESPONSE_DECONFIGURED:
		return sysfs_emit(buf, "DECONFIGURED\n");
	case AP_RESPONSE_CHECKSTOPPED:
		return sysfs_emit(buf, "CHECKSTOPPED\n");
	case AP_RESPONSE_BUSY:
		return sysfs_emit(buf, "BUSY\n");
	case AP_RESPONSE_INVALID_ADDRESS:
		return sysfs_emit(buf, "INVALID_ADDRESS\n");
	case AP_RESPONSE_OTHERWISE_CHANGED:
		return sysfs_emit(buf, "OTHERWISE_CHANGED\n");
	case AP_RESPONSE_Q_FULL:
		return sysfs_emit(buf, "Q_FULL/NO_PENDING_REPLY\n");
	case AP_RESPONSE_INDEX_TOO_BIG:
		return sysfs_emit(buf, "INDEX_TOO_BIG\n");
	case AP_RESPONSE_NO_FIRST_PART:
		return sysfs_emit(buf, "NO_FIRST_PART\n");
	case AP_RESPONSE_MESSAGE_TOO_BIG:
		return sysfs_emit(buf, "MESSAGE_TOO_BIG\n");
	case AP_RESPONSE_REQ_FAC_NOT_INST:
		return sysfs_emit(buf, "REQ_FAC_NOT_INST\n");
	default:
		return sysfs_emit(buf, "response code %d\n", rc);
	}
}
static DEVICE_ATTR_RO(last_err_rc);
#endif

static struct attribute *ap_queue_dev_attrs[] = {
	&dev_attr_request_count.attr,
	&dev_attr_requestq_count.attr,
	&dev_attr_pendingq_count.attr,
	&dev_attr_reset.attr,
	&dev_attr_interrupt.attr,
	&dev_attr_config.attr,
	&dev_attr_chkstop.attr,
	&dev_attr_ap_functions.attr,
#ifdef CONFIG_ZCRYPT_DEBUG
	&dev_attr_states.attr,
	&dev_attr_last_err_rc.attr,
#endif
	NULL
};

static struct attribute_group ap_queue_dev_attr_group = {
	.attrs = ap_queue_dev_attrs
};

static const struct attribute_group *ap_queue_dev_attr_groups[] = {
	&ap_queue_dev_attr_group,
	NULL
};

static struct device_type ap_queue_type = {
	.name = "ap_queue",
	.groups = ap_queue_dev_attr_groups,
};

static ssize_t se_bind_show(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	struct ap_queue_status status;
	struct ap_tapq_hwinfo hwinfo;

	if (!ap_q_supports_bind(aq))
		return sysfs_emit(buf, "-\n");

	status = ap_test_queue(aq->qid, 1, &hwinfo);
	if (status.response_code > AP_RESPONSE_BUSY) {
		pr_debug("%s RC 0x%02x on tapq(0x%02x.%04x)\n",
			 __func__, status.response_code,
			 AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return -EIO;
	}

	/* update queue's SE bind state */
	spin_lock_bh(&aq->lock);
	aq->se_bstate = hwinfo.bs;
	spin_unlock_bh(&aq->lock);

	switch (hwinfo.bs) {
	case AP_BS_Q_USABLE:
	case AP_BS_Q_USABLE_NO_SECURE_KEY:
		return sysfs_emit(buf, "bound\n");
	default:
		return sysfs_emit(buf, "unbound\n");
	}
}

static ssize_t se_bind_store(struct device *dev,
			     struct device_attribute *attr,
			     const char *buf, size_t count)
{
	struct ap_queue *aq = to_ap_queue(dev);
	struct ap_queue_status status;
	struct ap_tapq_hwinfo hwinfo;
	bool value;
	int rc;

	if (!ap_q_supports_bind(aq))
		return -EINVAL;

	/* only 0 (unbind) and 1 (bind) allowed */
	rc = kstrtobool(buf, &value);
	if (rc)
		return rc;

	if (!value) {
		/* Unbind. Set F bit arg and trigger RAPQ */
		spin_lock_bh(&aq->lock);
		__ap_flush_queue(aq);
		aq->rapq_fbit = 1;
		_ap_queue_init_state(aq);
		rc = count;
		goto out;
	}

	/* Bind. Check current SE bind state */
	status = ap_test_queue(aq->qid, 1, &hwinfo);
	if (status.response_code) {
		AP_DBF_WARN("%s RC 0x%02x on tapq(0x%02x.%04x)\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return -EIO;
	}

	/* Update BS state */
	spin_lock_bh(&aq->lock);
	aq->se_bstate = hwinfo.bs;
	if (hwinfo.bs != AP_BS_Q_AVAIL_FOR_BINDING) {
		AP_DBF_WARN("%s bind attempt with bs %d on queue 0x%02x.%04x\n",
			    __func__, hwinfo.bs,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		rc = -EINVAL;
		goto out;
	}

	/* Check SM state */
	if (aq->sm_state < AP_SM_STATE_IDLE) {
		rc = -EBUSY;
		goto out;
	}

	/* invoke BAPQ */
	status = ap_bapq(aq->qid);
	if (status.response_code) {
		AP_DBF_WARN("%s RC 0x%02x on bapq(0x%02x.%04x)\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		rc = -EIO;
		goto out;
	}
	aq->assoc_idx = ASSOC_IDX_INVALID;

	/* verify SE bind state */
	status = ap_test_queue(aq->qid, 1, &hwinfo);
	if (status.response_code) {
		AP_DBF_WARN("%s RC 0x%02x on tapq(0x%02x.%04x)\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		rc = -EIO;
		goto out;
	}
	aq->se_bstate = hwinfo.bs;
	if (!(hwinfo.bs == AP_BS_Q_USABLE ||
	      hwinfo.bs == AP_BS_Q_USABLE_NO_SECURE_KEY)) {
		AP_DBF_WARN("%s BAPQ success, but bs shows %d on queue 0x%02x.%04x\n",
			    __func__, hwinfo.bs,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		rc = -EIO;
		goto out;
	}

	/* SE bind was successful */
	AP_DBF_INFO("%s bapq(0x%02x.%04x) success\n", __func__,
		    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
	rc = count;

out:
	spin_unlock_bh(&aq->lock);
	return rc;
}

static DEVICE_ATTR_RW(se_bind);

static ssize_t se_associate_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct ap_queue *aq = to_ap_queue(dev);
	struct ap_queue_status status;
	struct ap_tapq_hwinfo hwinfo;

	if (!ap_q_supports_assoc(aq))
		return sysfs_emit(buf, "-\n");

	status = ap_test_queue(aq->qid, 1, &hwinfo);
	if (status.response_code > AP_RESPONSE_BUSY) {
		pr_debug("%s RC 0x%02x on tapq(0x%02x.%04x)\n",
			 __func__, status.response_code,
			 AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return -EIO;
	}

	/* update queue's SE bind state */
	spin_lock_bh(&aq->lock);
	aq->se_bstate = hwinfo.bs;
	spin_unlock_bh(&aq->lock);

	switch (hwinfo.bs) {
	case AP_BS_Q_USABLE:
		if (aq->assoc_idx == ASSOC_IDX_INVALID) {
			AP_DBF_WARN("%s AP_BS_Q_USABLE but invalid assoc_idx\n", __func__);
			return -EIO;
		}
		return sysfs_emit(buf, "associated %u\n", aq->assoc_idx);
	case AP_BS_Q_USABLE_NO_SECURE_KEY:
		if (aq->assoc_idx != ASSOC_IDX_INVALID)
			return sysfs_emit(buf, "association pending\n");
		fallthrough;
	default:
		return sysfs_emit(buf, "unassociated\n");
	}
}

static ssize_t se_associate_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t count)
{
	struct ap_queue *aq = to_ap_queue(dev);
	struct ap_queue_status status;
	struct ap_tapq_hwinfo hwinfo;
	unsigned int value;
	int rc;

	if (!ap_q_supports_assoc(aq))
		return -EINVAL;

	/* association index needs to be >= 0 */
	rc = kstrtouint(buf, 0, &value);
	if (rc)
		return rc;
	if (value >= ASSOC_IDX_INVALID)
		return -EINVAL;

	/* check current SE bind state */
	status = ap_test_queue(aq->qid, 1, &hwinfo);
	if (status.response_code) {
		AP_DBF_WARN("%s RC 0x%02x on tapq(0x%02x.%04x)\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		return -EIO;
	}
	spin_lock_bh(&aq->lock);
	aq->se_bstate = hwinfo.bs;
	if (hwinfo.bs != AP_BS_Q_USABLE_NO_SECURE_KEY) {
		AP_DBF_WARN("%s association attempt with bs %d on queue 0x%02x.%04x\n",
			    __func__, hwinfo.bs,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		rc = -EINVAL;
		goto out;
	}

	/* check SM state */
	if (aq->sm_state != AP_SM_STATE_IDLE) {
		rc = -EBUSY;
		goto out;
	}

	/* trigger the asynchronous association request */
	status = ap_aapq(aq->qid, value);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
	case AP_RESPONSE_STATE_CHANGE_IN_PROGRESS:
		aq->sm_state = AP_SM_STATE_ASSOC_WAIT;
		aq->assoc_idx = value;
		ap_wait(ap_sm_event(aq, AP_SM_EVENT_POLL));
		break;
	default:
		AP_DBF_WARN("%s RC 0x%02x on aapq(0x%02x.%04x)\n",
			    __func__, status.response_code,
			    AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid));
		rc = -EIO;
		goto out;
	}

	rc = count;

out:
	spin_unlock_bh(&aq->lock);
	return rc;
}

static DEVICE_ATTR_RW(se_associate);

static struct attribute *ap_queue_dev_sb_attrs[] = {
	&dev_attr_se_bind.attr,
	&dev_attr_se_associate.attr,
	NULL
};

static struct attribute_group ap_queue_dev_sb_attr_group = {
	.attrs = ap_queue_dev_sb_attrs
};

static const struct attribute_group *ap_queue_dev_sb_attr_groups[] = {
	&ap_queue_dev_sb_attr_group,
	NULL
};

static void ap_queue_device_release(struct device *dev)
{
	struct ap_queue *aq = to_ap_queue(dev);

	spin_lock_bh(&ap_queues_lock);
	hash_del(&aq->hnode);
	spin_unlock_bh(&ap_queues_lock);

	kfree(aq);
}

struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type)
{
	struct ap_queue *aq;

	aq = kzalloc(sizeof(*aq), GFP_KERNEL);
	if (!aq)
		return NULL;
	aq->ap_dev.device.release = ap_queue_device_release;
	aq->ap_dev.device.type = &ap_queue_type;
	aq->ap_dev.device_type = device_type;
	// add optional SE secure binding attributes group
	if (ap_sb_available() && is_prot_virt_guest())
		aq->ap_dev.device.groups = ap_queue_dev_sb_attr_groups;
	aq->qid = qid;
	spin_lock_init(&aq->lock);
	INIT_LIST_HEAD(&aq->pendingq);
	INIT_LIST_HEAD(&aq->requestq);
	timer_setup(&aq->timeout, ap_request_timeout, 0);

	return aq;
}

void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *reply)
{
	aq->reply = reply;

	spin_lock_bh(&aq->lock);
	ap_wait(ap_sm_event(aq, AP_SM_EVENT_POLL));
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_queue_init_reply);

/**
 * ap_queue_message(): Queue a request to an AP device.
 * @aq: The AP device to queue the message to
 * @ap_msg: The message that is to be added
 */
int ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg)
{
	int rc = 0;

	/* msg needs to have a valid receive-callback */
	BUG_ON(!ap_msg->receive);

	spin_lock_bh(&aq->lock);

	/* only allow to queue new messages if device state is ok */
	if (aq->dev_state == AP_DEV_STATE_OPERATING) {
		list_add_tail(&ap_msg->list, &aq->requestq);
		aq->requestq_count++;
		aq->total_request_count++;
		atomic64_inc(&aq->card->total_request_count);
	} else {
		rc = -ENODEV;
	}

	/* Send/receive as many request from the queue as possible. */
	ap_wait(ap_sm_event_loop(aq, AP_SM_EVENT_POLL));

	spin_unlock_bh(&aq->lock);

	return rc;
}
EXPORT_SYMBOL(ap_queue_message);

/**
 * ap_queue_usable(): Check if queue is usable just now.
 * @aq: The AP queue device to test for usability.
 * This function is intended for the scheduler to query if it makes
 * sense to enqueue a message into this AP queue device by calling
 * ap_queue_message(). The perspective is very short-term as the
 * state machine and device state(s) may change at any time.
 */
bool ap_queue_usable(struct ap_queue *aq)
{
	bool rc = true;

	spin_lock_bh(&aq->lock);

	/* check for not configured or checkstopped */
	if (!aq->config || aq->chkstop) {
		rc = false;
		goto unlock_and_out;
	}

	/* device state needs to be ok */
	if (aq->dev_state != AP_DEV_STATE_OPERATING) {
		rc = false;
		goto unlock_and_out;
	}

	/* SE guest's queues additionally need to be bound */
	if (ap_q_needs_bind(aq) &&
	    !(aq->se_bstate == AP_BS_Q_USABLE ||
	      aq->se_bstate == AP_BS_Q_USABLE_NO_SECURE_KEY))
		rc = false;

unlock_and_out:
	spin_unlock_bh(&aq->lock);
	return rc;
}
EXPORT_SYMBOL(ap_queue_usable);

/**
 * ap_cancel_message(): Cancel a crypto request.
 * @aq: The AP device that has the message queued
 * @ap_msg: The message that is to be removed
 *
 * Cancel a crypto request. This is done by removing the request
 * from the device pending or request queue. Note that the
 * request stays on the AP queue. When it finishes the message
 * reply will be discarded because the psmid can't be found.
 */
void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg)
{
	struct ap_message *tmp;

	spin_lock_bh(&aq->lock);
	if (!list_empty(&ap_msg->list)) {
		list_for_each_entry(tmp, &aq->pendingq, list)
			if (tmp->psmid == ap_msg->psmid) {
				aq->pendingq_count--;
				goto found;
			}
		aq->requestq_count--;
found:
		list_del_init(&ap_msg->list);
	}
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_cancel_message);

/**
 * __ap_flush_queue(): Flush requests.
 * @aq: Pointer to the AP queue
 *
 * Flush all requests from the request/pending queue of an AP device.
 */
static void __ap_flush_queue(struct ap_queue *aq)
{
	struct ap_message *ap_msg, *next;

	list_for_each_entry_safe(ap_msg, next, &aq->pendingq, list) {
		list_del_init(&ap_msg->list);
		aq->pendingq_count--;
		ap_msg->rc = -EAGAIN;
		ap_msg->receive(aq, ap_msg, NULL);
	}
	list_for_each_entry_safe(ap_msg, next, &aq->requestq, list) {
		list_del_init(&ap_msg->list);
		aq->requestq_count--;
		ap_msg->rc = -EAGAIN;
		ap_msg->receive(aq, ap_msg, NULL);
	}
	aq->queue_count = 0;
}

void ap_flush_queue(struct ap_queue *aq)
{
	spin_lock_bh(&aq->lock);
	__ap_flush_queue(aq);
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_flush_queue);

void ap_queue_prepare_remove(struct ap_queue *aq)
{
	spin_lock_bh(&aq->lock);
	/* flush queue */
	__ap_flush_queue(aq);
	/* move queue device state to SHUTDOWN in progress */
	aq->dev_state = AP_DEV_STATE_SHUTDOWN;
	spin_unlock_bh(&aq->lock);
	del_timer_sync(&aq->timeout);
}

void ap_queue_remove(struct ap_queue *aq)
{
	/*
	 * all messages have been flushed and the device state
	 * is SHUTDOWN. Now reset with zero which also clears
	 * the irq registration and move the device state
	 * to the initial value AP_DEV_STATE_UNINITIATED.
	 */
	spin_lock_bh(&aq->lock);
	ap_zapq(aq->qid, 0);
	aq->dev_state = AP_DEV_STATE_UNINITIATED;
	spin_unlock_bh(&aq->lock);
}

void _ap_queue_init_state(struct ap_queue *aq)
{
	aq->dev_state = AP_DEV_STATE_OPERATING;
	aq->sm_state = AP_SM_STATE_RESET_START;
	aq->last_err_rc = 0;
	aq->assoc_idx = ASSOC_IDX_INVALID;
	ap_wait(ap_sm_event(aq, AP_SM_EVENT_POLL));
}

void ap_queue_init_state(struct ap_queue *aq)
{
	spin_lock_bh(&aq->lock);
	_ap_queue_init_state(aq);
	spin_unlock_bh(&aq->lock);
}
EXPORT_SYMBOL(ap_queue_init_state);