aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/scsi/megaraid/megaraid_mm.c
blob: ac3b280c2a72abb7a310834b4ae45a924327db32 (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
/*
 *
 *			Linux MegaRAID device driver
 *
 * Copyright (c) 2003-2004  LSI Logic Corporation.
 *
 *	   This program 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; either version
 *	   2 of the License, or (at your option) any later version.
 *
 * FILE		: megaraid_mm.c
 * Version	: v2.20.2.7 (Jul 16 2006)
 *
 * Common management module
 */
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include "megaraid_mm.h"


// Entry points for char node driver
static int mraid_mm_open(struct inode *, struct file *);
static int mraid_mm_ioctl(struct inode *, struct file *, uint, unsigned long);


// routines to convert to and from the old the format
static int mimd_to_kioc(mimd_t __user *, mraid_mmadp_t *, uioc_t *);
static int kioc_to_mimd(uioc_t *, mimd_t __user *);


// Helper functions
static int handle_drvrcmd(void __user *, uint8_t, int *);
static int lld_ioctl(mraid_mmadp_t *, uioc_t *);
static void ioctl_done(uioc_t *);
static void lld_timedout(unsigned long);
static void hinfo_to_cinfo(mraid_hba_info_t *, mcontroller_t *);
static mraid_mmadp_t *mraid_mm_get_adapter(mimd_t __user *, int *);
static uioc_t *mraid_mm_alloc_kioc(mraid_mmadp_t *);
static void mraid_mm_dealloc_kioc(mraid_mmadp_t *, uioc_t *);
static int mraid_mm_attach_buf(mraid_mmadp_t *, uioc_t *, int);
static int mraid_mm_setup_dma_pools(mraid_mmadp_t *);
static void mraid_mm_free_adp_resources(mraid_mmadp_t *);
static void mraid_mm_teardown_dma_pools(mraid_mmadp_t *);

#ifdef CONFIG_COMPAT
static long mraid_mm_compat_ioctl(struct file *, unsigned int, unsigned long);
#endif

MODULE_AUTHOR("LSI Logic Corporation");
MODULE_DESCRIPTION("LSI Logic Management Module");
MODULE_LICENSE("GPL");
MODULE_VERSION(LSI_COMMON_MOD_VERSION);

static int dbglevel = CL_ANN;
module_param_named(dlevel, dbglevel, int, 0);
MODULE_PARM_DESC(dlevel, "Debug level (default=0)");

EXPORT_SYMBOL(mraid_mm_register_adp);
EXPORT_SYMBOL(mraid_mm_unregister_adp);
EXPORT_SYMBOL(mraid_mm_adapter_app_handle);

static uint32_t drvr_ver	= 0x02200207;

static int adapters_count_g;
static struct list_head adapters_list_g;

static wait_queue_head_t wait_q;

static const struct file_operations lsi_fops = {
	.open	= mraid_mm_open,
	.ioctl	= mraid_mm_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = mraid_mm_compat_ioctl,
#endif
	.owner	= THIS_MODULE,
};

static struct miscdevice megaraid_mm_dev = {
	.minor	= MISC_DYNAMIC_MINOR,
	.name   = "megadev0",
	.fops   = &lsi_fops,
};

/**
 * mraid_mm_open - open routine for char node interface
 * @inode	: unused
 * @filep	: unused
 *
 * Allow ioctl operations by apps only if they have superuser privilege.
 */
static int
mraid_mm_open(struct inode *inode, struct file *filep)
{
	/*
	 * Only allow superuser to access private ioctl interface
	 */
	if (!capable(CAP_SYS_ADMIN)) return (-EACCES);

	cycle_kernel_lock();
	return 0;
}

/**
 * mraid_mm_ioctl - module entry-point for ioctls
 * @inode	: inode (ignored)
 * @filep	: file operations pointer (ignored)
 * @cmd		: ioctl command
 * @arg		: user ioctl packet
 */
static int
mraid_mm_ioctl(struct inode *inode, struct file *filep, unsigned int cmd,
							unsigned long arg)
{
	uioc_t		*kioc;
	char		signature[EXT_IOCTL_SIGN_SZ]	= {0};
	int		rval;
	mraid_mmadp_t	*adp;
	uint8_t		old_ioctl;
	int		drvrcmd_rval;
	void __user *argp = (void __user *)arg;

	/*
	 * Make sure only USCSICMD are issued through this interface.
	 * MIMD application would still fire different command.
	 */

	if ((_IOC_TYPE(cmd) != MEGAIOC_MAGIC) && (cmd != USCSICMD)) {
		return (-EINVAL);
	}

	/*
	 * Look for signature to see if this is the new or old ioctl format.
	 */
	if (copy_from_user(signature, argp, EXT_IOCTL_SIGN_SZ)) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid cmm: copy from usr addr failed\n"));
		return (-EFAULT);
	}

	if (memcmp(signature, EXT_IOCTL_SIGN, EXT_IOCTL_SIGN_SZ) == 0)
		old_ioctl = 0;
	else
		old_ioctl = 1;

	/*
	 * At present, we don't support the new ioctl packet
	 */
	if (!old_ioctl )
		return (-EINVAL);

	/*
	 * If it is a driver ioctl (as opposed to fw ioctls), then we can
	 * handle the command locally. rval > 0 means it is not a drvr cmd
	 */
	rval = handle_drvrcmd(argp, old_ioctl, &drvrcmd_rval);

	if (rval < 0)
		return rval;
	else if (rval == 0)
		return drvrcmd_rval;

	rval = 0;
	if ((adp = mraid_mm_get_adapter(argp, &rval)) == NULL) {
		return rval;
	}

	/*
	 * Check if adapter can accept ioctl. We may have marked it offline
	 * if any previous kioc had timedout on this controller.
	 */
	if (!adp->quiescent) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid cmm: controller cannot accept cmds due to "
			"earlier errors\n" ));
		return -EFAULT;
	}

	/*
	 * The following call will block till a kioc is available
	 */
	kioc = mraid_mm_alloc_kioc(adp);

	/*
	 * User sent the old mimd_t ioctl packet. Convert it to uioc_t.
	 */
	if ((rval = mimd_to_kioc(argp, adp, kioc))) {
		mraid_mm_dealloc_kioc(adp, kioc);
		return rval;
	}

	kioc->done = ioctl_done;

	/*
	 * Issue the IOCTL to the low level driver. After the IOCTL completes
	 * release the kioc if and only if it was _not_ timedout. If it was
	 * timedout, that means that resources are still with low level driver.
	 */
	if ((rval = lld_ioctl(adp, kioc))) {

		if (!kioc->timedout)
			mraid_mm_dealloc_kioc(adp, kioc);

		return rval;
	}

	/*
	 * Convert the kioc back to user space
	 */
	rval = kioc_to_mimd(kioc, argp);

	/*
	 * Return the kioc to free pool
	 */
	mraid_mm_dealloc_kioc(adp, kioc);

	return rval;
}


/**
 * mraid_mm_get_adapter - Returns corresponding adapters for the mimd packet
 * @umimd	: User space mimd_t ioctl packet
 * @rval	: returned success/error status
 *
 * The function return value is a pointer to the located @adapter.
 */
static mraid_mmadp_t *
mraid_mm_get_adapter(mimd_t __user *umimd, int *rval)
{
	mraid_mmadp_t	*adapter;
	mimd_t		mimd;
	uint32_t	adapno;
	int		iterator;


	if (copy_from_user(&mimd, umimd, sizeof(mimd_t))) {
		*rval = -EFAULT;
		return NULL;
	}

	adapno = GETADAP(mimd.ui.fcs.adapno);

	if (adapno >= adapters_count_g) {
		*rval = -ENODEV;
		return NULL;
	}

	adapter = NULL;
	iterator = 0;

	list_for_each_entry(adapter, &adapters_list_g, list) {
		if (iterator++ == adapno) break;
	}

	if (!adapter) {
		*rval = -ENODEV;
		return NULL;
	}

	return adapter;
}

/**
 * handle_drvrcmd - Checks if the opcode is a driver cmd and if it is, handles it.
 * @arg		: packet sent by the user app
 * @old_ioctl	: mimd if 1; uioc otherwise
 * @rval	: pointer for command's returned value (not function status)
 */
static int
handle_drvrcmd(void __user *arg, uint8_t old_ioctl, int *rval)
{
	mimd_t		__user *umimd;
	mimd_t		kmimd;
	uint8_t		opcode;
	uint8_t		subopcode;

	if (old_ioctl)
		goto old_packet;
	else
		goto new_packet;

new_packet:
	return (-ENOTSUPP);

old_packet:
	*rval = 0;
	umimd = arg;

	if (copy_from_user(&kmimd, umimd, sizeof(mimd_t)))
		return (-EFAULT);

	opcode		= kmimd.ui.fcs.opcode;
	subopcode	= kmimd.ui.fcs.subopcode;

	/*
	 * If the opcode is 0x82 and the subopcode is either GET_DRVRVER or
	 * GET_NUMADP, then we can handle. Otherwise we should return 1 to
	 * indicate that we cannot handle this.
	 */
	if (opcode != 0x82)
		return 1;

	switch (subopcode) {

	case MEGAIOC_QDRVRVER:

		if (copy_to_user(kmimd.data, &drvr_ver, sizeof(uint32_t)))
			return (-EFAULT);

		return 0;

	case MEGAIOC_QNADAP:

		*rval = adapters_count_g;

		if (copy_to_user(kmimd.data, &adapters_count_g,
				sizeof(uint32_t)))
			return (-EFAULT);

		return 0;

	default:
		/* cannot handle */
		return 1;
	}

	return 0;
}


/**
 * mimd_to_kioc	- Converter from old to new ioctl format
 * @umimd	: user space old MIMD IOCTL
 * @adp		: adapter softstate
 * @kioc	: kernel space new format IOCTL
 *
 * Routine to convert MIMD interface IOCTL to new interface IOCTL packet. The
 * new packet is in kernel space so that driver can perform operations on it
 * freely.
 */

static int
mimd_to_kioc(mimd_t __user *umimd, mraid_mmadp_t *adp, uioc_t *kioc)
{
	mbox64_t		*mbox64;
	mbox_t			*mbox;
	mraid_passthru_t	*pthru32;
	uint32_t		adapno;
	uint8_t			opcode;
	uint8_t			subopcode;
	mimd_t			mimd;

	if (copy_from_user(&mimd, umimd, sizeof(mimd_t)))
		return (-EFAULT);

	/*
	 * Applications are not allowed to send extd pthru
	 */
	if ((mimd.mbox[0] == MBOXCMD_PASSTHRU64) ||
			(mimd.mbox[0] == MBOXCMD_EXTPTHRU))
		return (-EINVAL);

	opcode		= mimd.ui.fcs.opcode;
	subopcode	= mimd.ui.fcs.subopcode;
	adapno		= GETADAP(mimd.ui.fcs.adapno);

	if (adapno >= adapters_count_g)
		return (-ENODEV);

	kioc->adapno	= adapno;
	kioc->mb_type	= MBOX_LEGACY;
	kioc->app_type	= APPTYPE_MIMD;

	switch (opcode) {

	case 0x82:

		if (subopcode == MEGAIOC_QADAPINFO) {

			kioc->opcode	= GET_ADAP_INFO;
			kioc->data_dir	= UIOC_RD;
			kioc->xferlen	= sizeof(mraid_hba_info_t);

			if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
				return (-ENOMEM);
		}
		else {
			con_log(CL_ANN, (KERN_WARNING
					"megaraid cmm: Invalid subop\n"));
			return (-EINVAL);
		}

		break;

	case 0x81:

		kioc->opcode		= MBOX_CMD;
		kioc->xferlen		= mimd.ui.fcs.length;
		kioc->user_data_len	= kioc->xferlen;
		kioc->user_data		= mimd.ui.fcs.buffer;

		if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
			return (-ENOMEM);

		if (mimd.outlen) kioc->data_dir  = UIOC_RD;
		if (mimd.inlen) kioc->data_dir |= UIOC_WR;

		break;

	case 0x80:

		kioc->opcode		= MBOX_CMD;
		kioc->xferlen		= (mimd.outlen > mimd.inlen) ?
						mimd.outlen : mimd.inlen;
		kioc->user_data_len	= kioc->xferlen;
		kioc->user_data		= mimd.data;

		if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
			return (-ENOMEM);

		if (mimd.outlen) kioc->data_dir  = UIOC_RD;
		if (mimd.inlen) kioc->data_dir |= UIOC_WR;

		break;

	default:
		return (-EINVAL);
	}

	/*
	 * If driver command, nothing else to do
	 */
	if (opcode == 0x82)
		return 0;

	/*
	 * This is a mailbox cmd; copy the mailbox from mimd
	 */
	mbox64	= (mbox64_t *)((unsigned long)kioc->cmdbuf);
	mbox	= &mbox64->mbox32;
	memcpy(mbox, mimd.mbox, 14);

	if (mbox->cmd != MBOXCMD_PASSTHRU) {	// regular DCMD

		mbox->xferaddr	= (uint32_t)kioc->buf_paddr;

		if (kioc->data_dir & UIOC_WR) {
			if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
							kioc->xferlen)) {
				return (-EFAULT);
			}
		}

		return 0;
	}

	/*
	 * This is a regular 32-bit pthru cmd; mbox points to pthru struct.
	 * Just like in above case, the beginning for memblk is treated as
	 * a mailbox. The passthru will begin at next 1K boundary. And the
	 * data will start 1K after that.
	 */
	pthru32			= kioc->pthru32;
	kioc->user_pthru	= &umimd->pthru;
	mbox->xferaddr		= (uint32_t)kioc->pthru32_h;

	if (copy_from_user(pthru32, kioc->user_pthru,
			sizeof(mraid_passthru_t))) {
		return (-EFAULT);
	}

	pthru32->dataxferaddr	= kioc->buf_paddr;
	if (kioc->data_dir & UIOC_WR) {
		if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
						pthru32->dataxferlen)) {
			return (-EFAULT);
		}
	}

	return 0;
}

/**
 * mraid_mm_attch_buf - Attach a free dma buffer for required size
 * @adp		: Adapter softstate
 * @kioc	: kioc that the buffer needs to be attached to
 * @xferlen	: required length for buffer
 *
 * First we search for a pool with smallest buffer that is >= @xferlen. If
 * that pool has no free buffer, we will try for the next bigger size. If none
 * is available, we will try to allocate the smallest buffer that is >=
 * @xferlen and attach it the pool.
 */
static int
mraid_mm_attach_buf(mraid_mmadp_t *adp, uioc_t *kioc, int xferlen)
{
	mm_dmapool_t	*pool;
	int		right_pool = -1;
	unsigned long	flags;
	int		i;

	kioc->pool_index	= -1;
	kioc->buf_vaddr		= NULL;
	kioc->buf_paddr		= 0;
	kioc->free_buf		= 0;

	/*
	 * We need xferlen amount of memory. See if we can get it from our
	 * dma pools. If we don't get exact size, we will try bigger buffer
	 */

	for (i = 0; i < MAX_DMA_POOLS; i++) {

		pool = &adp->dma_pool_list[i];

		if (xferlen > pool->buf_size)
			continue;

		if (right_pool == -1)
			right_pool = i;

		spin_lock_irqsave(&pool->lock, flags);

		if (!pool->in_use) {

			pool->in_use		= 1;
			kioc->pool_index	= i;
			kioc->buf_vaddr		= pool->vaddr;
			kioc->buf_paddr		= pool->paddr;

			spin_unlock_irqrestore(&pool->lock, flags);
			return 0;
		}
		else {
			spin_unlock_irqrestore(&pool->lock, flags);
			continue;
		}
	}

	/*
	 * If xferlen doesn't match any of our pools, return error
	 */
	if (right_pool == -1)
		return -EINVAL;

	/*
	 * We did not get any buffer from the preallocated pool. Let us try
	 * to allocate one new buffer. NOTE: This is a blocking call.
	 */
	pool = &adp->dma_pool_list[right_pool];

	spin_lock_irqsave(&pool->lock, flags);

	kioc->pool_index	= right_pool;
	kioc->free_buf		= 1;
	kioc->buf_vaddr 	= pci_pool_alloc(pool->handle, GFP_KERNEL,
							&kioc->buf_paddr);
	spin_unlock_irqrestore(&pool->lock, flags);

	if (!kioc->buf_vaddr)
		return -ENOMEM;

	return 0;
}

/**
 * mraid_mm_alloc_kioc - Returns a uioc_t from free list
 * @adp	: Adapter softstate for this module
 *
 * The kioc_semaphore is initialized with number of kioc nodes in the
 * free kioc pool. If the kioc pool is empty, this function blocks till
 * a kioc becomes free.
 */
static uioc_t *
mraid_mm_alloc_kioc(mraid_mmadp_t *adp)
{
	uioc_t			*kioc;
	struct list_head*	head;
	unsigned long		flags;

	down(&adp->kioc_semaphore);

	spin_lock_irqsave(&adp->kioc_pool_lock, flags);

	head = &adp->kioc_pool;

	if (list_empty(head)) {
		up(&adp->kioc_semaphore);
		spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);

		con_log(CL_ANN, ("megaraid cmm: kioc list empty!\n"));
		return NULL;
	}

	kioc = list_entry(head->next, uioc_t, list);
	list_del_init(&kioc->list);

	spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);

	memset((caddr_t)(unsigned long)kioc->cmdbuf, 0, sizeof(mbox64_t));
	memset((caddr_t) kioc->pthru32, 0, sizeof(mraid_passthru_t));

	kioc->buf_vaddr		= NULL;
	kioc->buf_paddr		= 0;
	kioc->pool_index	=-1;
	kioc->free_buf		= 0;
	kioc->user_data		= NULL;
	kioc->user_data_len	= 0;
	kioc->user_pthru	= NULL;
	kioc->timedout		= 0;

	return kioc;
}

/**
 * mraid_mm_dealloc_kioc - Return kioc to free pool
 * @adp		: Adapter softstate
 * @kioc	: uioc_t node to be returned to free pool
 */
static void
mraid_mm_dealloc_kioc(mraid_mmadp_t *adp, uioc_t *kioc)
{
	mm_dmapool_t	*pool;
	unsigned long	flags;

	if (kioc->pool_index != -1) {
		pool = &adp->dma_pool_list[kioc->pool_index];

		/* This routine may be called in non-isr context also */
		spin_lock_irqsave(&pool->lock, flags);

		/*
		 * While attaching the dma buffer, if we didn't get the 
		 * required buffer from the pool, we would have allocated 
		 * it at the run time and set the free_buf flag. We must 
		 * free that buffer. Otherwise, just mark that the buffer is 
		 * not in use
		 */
		if (kioc->free_buf == 1)
			pci_pool_free(pool->handle, kioc->buf_vaddr, 
							kioc->buf_paddr);
		else
			pool->in_use = 0;

		spin_unlock_irqrestore(&pool->lock, flags);
	}

	/* Return the kioc to the free pool */
	spin_lock_irqsave(&adp->kioc_pool_lock, flags);
	list_add(&kioc->list, &adp->kioc_pool);
	spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);

	/* increment the free kioc count */
	up(&adp->kioc_semaphore);

	return;
}

/**
 * lld_ioctl - Routine to issue ioctl to low level drvr
 * @adp		: The adapter handle
 * @kioc	: The ioctl packet with kernel addresses
 */
static int
lld_ioctl(mraid_mmadp_t *adp, uioc_t *kioc)
{
	int			rval;
	struct timer_list	timer;
	struct timer_list	*tp = NULL;

	kioc->status	= -ENODATA;
	rval		= adp->issue_uioc(adp->drvr_data, kioc, IOCTL_ISSUE);

	if (rval) return rval;

	/*
	 * Start the timer
	 */
	if (adp->timeout > 0) {
		tp		= &timer;
		init_timer(tp);

		tp->function	= lld_timedout;
		tp->data	= (unsigned long)kioc;
		tp->expires	= jiffies + adp->timeout * HZ;

		add_timer(tp);
	}

	/*
	 * Wait till the low level driver completes the ioctl. After this
	 * call, the ioctl either completed successfully or timedout.
	 */
	wait_event(wait_q, (kioc->status != -ENODATA));
	if (tp) {
		del_timer_sync(tp);
	}

	/*
	 * If the command had timedout, we mark the controller offline
	 * before returning
	 */
	if (kioc->timedout) {
		adp->quiescent = 0;
	}

	return kioc->status;
}


/**
 * ioctl_done - callback from the low level driver
 * @kioc	: completed ioctl packet
 */
static void
ioctl_done(uioc_t *kioc)
{
	uint32_t	adapno;
	int		iterator;
	mraid_mmadp_t*	adapter;

	/*
	 * When the kioc returns from driver, make sure it still doesn't
	 * have ENODATA in status. Otherwise, driver will hang on wait_event
	 * forever
	 */
	if (kioc->status == -ENODATA) {
		con_log(CL_ANN, (KERN_WARNING
			"megaraid cmm: lld didn't change status!\n"));

		kioc->status = -EINVAL;
	}

	/*
	 * Check if this kioc was timedout before. If so, nobody is waiting
	 * on this kioc. We don't have to wake up anybody. Instead, we just
	 * have to free the kioc
	 */
	if (kioc->timedout) {
		iterator	= 0;
		adapter		= NULL;
		adapno		= kioc->adapno;

		con_log(CL_ANN, ( KERN_WARNING "megaraid cmm: completed "
					"ioctl that was timedout before\n"));

		list_for_each_entry(adapter, &adapters_list_g, list) {
			if (iterator++ == adapno) break;
		}

		kioc->timedout = 0;

		if (adapter) {
			mraid_mm_dealloc_kioc( adapter, kioc );
		}
	}
	else {
		wake_up(&wait_q);
	}
}


/**
 * lld_timedout	- callback from the expired timer
 * @ptr		: ioctl packet that timed out
 */
static void
lld_timedout(unsigned long ptr)
{
	uioc_t *kioc	= (uioc_t *)ptr;

	kioc->status 	= -ETIME;
	kioc->timedout	= 1;

	con_log(CL_ANN, (KERN_WARNING "megaraid cmm: ioctl timed out\n"));

	wake_up(&wait_q);
}


/**
 * kioc_to_mimd	- Converter from new back to old format
 * @kioc	: Kernel space IOCTL packet (successfully issued)
 * @mimd	: User space MIMD packet
 */
static int
kioc_to_mimd(uioc_t *kioc, mimd_t __user *mimd)
{
	mimd_t			kmimd;
	uint8_t			opcode;
	uint8_t			subopcode;

	mbox64_t		*mbox64;
	mraid_passthru_t	__user *upthru32;
	mraid_passthru_t	*kpthru32;
	mcontroller_t		cinfo;
	mraid_hba_info_t	*hinfo;


	if (copy_from_user(&kmimd, mimd, sizeof(mimd_t)))
		return (-EFAULT);

	opcode		= kmimd.ui.fcs.opcode;
	subopcode	= kmimd.ui.fcs.subopcode;

	if (opcode == 0x82) {
		switch (subopcode) {

		case MEGAIOC_QADAPINFO:

			hinfo = (mraid_hba_info_t *)(unsigned long)
					kioc->buf_vaddr;

			hinfo_to_cinfo(hinfo, &cinfo);

			if (copy_to_user(kmimd.data, &cinfo, sizeof(cinfo)))
				return (-EFAULT);

			return 0;

		default:
			return (-EINVAL);
		}

		return 0;
	}

	mbox64 = (mbox64_t *)(unsigned long)kioc->cmdbuf;

	if (kioc->user_pthru) {

		upthru32 = kioc->user_pthru;
		kpthru32 = kioc->pthru32;

		if (copy_to_user(&upthru32->scsistatus,
					&kpthru32->scsistatus,
					sizeof(uint8_t))) {
			return (-EFAULT);
		}
	}

	if (kioc->user_data) {
		if (copy_to_user(kioc->user_data, kioc->buf_vaddr,
					kioc->user_data_len)) {
			return (-EFAULT);
		}
	}

	if (copy_to_user(&mimd->mbox[17],
			&mbox64->mbox32.status, sizeof(uint8_t))) {
		return (-EFAULT);
	}

	return 0;
}


/**
 * hinfo_to_cinfo - Convert new format hba info into old format
 * @hinfo	: New format, more comprehensive adapter info
 * @cinfo	: Old format adapter info to support mimd_t apps
 */
static void
hinfo_to_cinfo(mraid_hba_info_t *hinfo, mcontroller_t *cinfo)
{
	if (!hinfo || !cinfo)
		return;

	cinfo->base		= hinfo->baseport;
	cinfo->irq		= hinfo->irq;
	cinfo->numldrv		= hinfo->num_ldrv;
	cinfo->pcibus		= hinfo->pci_bus;
	cinfo->pcidev		= hinfo->pci_slot;
	cinfo->pcifun		= PCI_FUNC(hinfo->pci_dev_fn);
	cinfo->pciid		= hinfo->pci_device_id;
	cinfo->pcivendor	= hinfo->pci_vendor_id;
	cinfo->pcislot		= hinfo->pci_slot;
	cinfo->uid		= hinfo->unique_id;
}


/**
 * mraid_mm_register_adp - Registration routine for low level drivers
 * @lld_adp	: Adapter objejct
 */
int
mraid_mm_register_adp(mraid_mmadp_t *lld_adp)
{
	mraid_mmadp_t	*adapter;
	mbox64_t	*mbox_list;
	uioc_t		*kioc;
	uint32_t	rval;
	int		i;


	if (lld_adp->drvr_type != DRVRTYPE_MBOX)
		return (-EINVAL);

	adapter = kzalloc(sizeof(mraid_mmadp_t), GFP_KERNEL);

	if (!adapter)
		return -ENOMEM;


	adapter->unique_id	= lld_adp->unique_id;
	adapter->drvr_type	= lld_adp->drvr_type;
	adapter->drvr_data	= lld_adp->drvr_data;
	adapter->pdev		= lld_adp->pdev;
	adapter->issue_uioc	= lld_adp->issue_uioc;
	adapter->timeout	= lld_adp->timeout;
	adapter->max_kioc	= lld_adp->max_kioc;
	adapter->quiescent	= 1;

	/*
	 * Allocate single blocks of memory for all required kiocs,
	 * mailboxes and passthru structures.
	 */
	adapter->kioc_list	= kmalloc(sizeof(uioc_t) * lld_adp->max_kioc,
						GFP_KERNEL);
	adapter->mbox_list	= kmalloc(sizeof(mbox64_t) * lld_adp->max_kioc,
						GFP_KERNEL);
	adapter->pthru_dma_pool = pci_pool_create("megaraid mm pthru pool",
						adapter->pdev,
						sizeof(mraid_passthru_t),
						16, 0);

	if (!adapter->kioc_list || !adapter->mbox_list ||
			!adapter->pthru_dma_pool) {

		con_log(CL_ANN, (KERN_WARNING
			"megaraid cmm: out of memory, %s %d\n", __FUNCTION__,
			__LINE__));

		rval = (-ENOMEM);

		goto memalloc_error;
	}

	/*
	 * Slice kioc_list and make a kioc_pool with the individiual kiocs
	 */
	INIT_LIST_HEAD(&adapter->kioc_pool);
	spin_lock_init(&adapter->kioc_pool_lock);
	sema_init(&adapter->kioc_semaphore, lld_adp->max_kioc);

	mbox_list	= (mbox64_t *)adapter->mbox_list;

	for (i = 0; i < lld_adp->max_kioc; i++) {

		kioc		= adapter->kioc_list + i;
		kioc->cmdbuf	= (uint64_t)(unsigned long)(mbox_list + i);
		kioc->pthru32	= pci_pool_alloc(adapter->pthru_dma_pool,
						GFP_KERNEL, &kioc->pthru32_h);

		if (!kioc->pthru32) {

			con_log(CL_ANN, (KERN_WARNING
				"megaraid cmm: out of memory, %s %d\n",
					__FUNCTION__, __LINE__));

			rval = (-ENOMEM);

			goto pthru_dma_pool_error;
		}

		list_add_tail(&kioc->list, &adapter->kioc_pool);
	}

	// Setup the dma pools for data buffers
	if ((rval = mraid_mm_setup_dma_pools(adapter)) != 0) {
		goto dma_pool_error;
	}

	list_add_tail(&adapter->list, &adapters_list_g);

	adapters_count_g++;

	return 0;

dma_pool_error:
	/* Do nothing */

pthru_dma_pool_error:

	for (i = 0; i < lld_adp->max_kioc; i++) {
		kioc = adapter->kioc_list + i;
		if (kioc->pthru32) {
			pci_pool_free(adapter->pthru_dma_pool, kioc->pthru32,
				kioc->pthru32_h);
		}
	}

memalloc_error:

	kfree(adapter->kioc_list);
	kfree(adapter->mbox_list);

	if (adapter->pthru_dma_pool)
		pci_pool_destroy(adapter->pthru_dma_pool);

	kfree(adapter);

	return rval;
}


/**
 * mraid_mm_adapter_app_handle - return the application handle for this adapter
 * @unique_id	: adapter unique identifier
 *
 * For the given driver data, locate the adapter in our global list and
 * return the corresponding handle, which is also used by applications to
 * uniquely identify an adapter.
 *
 * Return adapter handle if found in the list.
 * Return 0 if adapter could not be located, should never happen though.
 */
uint32_t
mraid_mm_adapter_app_handle(uint32_t unique_id)
{
	mraid_mmadp_t	*adapter;
	mraid_mmadp_t	*tmp;
	int		index = 0;

	list_for_each_entry_safe(adapter, tmp, &adapters_list_g, list) {

		if (adapter->unique_id == unique_id) {

			return MKADAP(index);
		}

		index++;
	}

	return 0;
}


/**
 * mraid_mm_setup_dma_pools - Set up dma buffer pools per adapter
 * @adp	: Adapter softstate
 *
 * We maintain a pool of dma buffers per each adapter. Each pool has one
 * buffer. E.g, we may have 5 dma pools - one each for 4k, 8k ... 64k buffers.
 * We have just one 4k buffer in 4k pool, one 8k buffer in 8k pool etc. We
 * dont' want to waste too much memory by allocating more buffers per each
 * pool.
 */
static int
mraid_mm_setup_dma_pools(mraid_mmadp_t *adp)
{
	mm_dmapool_t	*pool;
	int		bufsize;
	int		i;

	/*
	 * Create MAX_DMA_POOLS number of pools
	 */
	bufsize = MRAID_MM_INIT_BUFF_SIZE;

	for (i = 0; i < MAX_DMA_POOLS; i++){

		pool = &adp->dma_pool_list[i];

		pool->buf_size = bufsize;
		spin_lock_init(&pool->lock);

		pool->handle = pci_pool_create("megaraid mm data buffer",
						adp->pdev, bufsize, 16, 0);

		if (!pool->handle) {
			goto dma_pool_setup_error;
		}

		pool->vaddr = pci_pool_alloc(pool->handle, GFP_KERNEL,
							&pool->paddr);

		if (!pool->vaddr)
			goto dma_pool_setup_error;

		bufsize = bufsize * 2;
	}

	return 0;

dma_pool_setup_error:

	mraid_mm_teardown_dma_pools(adp);
	return (-ENOMEM);
}


/**
 * mraid_mm_unregister_adp - Unregister routine for low level drivers
 * @unique_id	: UID of the adpater
 *
 * Assumes no outstanding ioctls to llds.
 */
int
mraid_mm_unregister_adp(uint32_t unique_id)
{
	mraid_mmadp_t	*adapter;
	mraid_mmadp_t	*tmp;

	list_for_each_entry_safe(adapter, tmp, &adapters_list_g, list) {


		if (adapter->unique_id == unique_id) {

			adapters_count_g--;

			list_del_init(&adapter->list);

			mraid_mm_free_adp_resources(adapter);

			kfree(adapter);

			con_log(CL_ANN, (
				"megaraid cmm: Unregistered one adapter:%#x\n",
				unique_id));

			return 0;
		}
	}

	return (-ENODEV);
}

/**
 * mraid_mm_free_adp_resources - Free adapter softstate
 * @adp	: Adapter softstate
 */
static void
mraid_mm_free_adp_resources(mraid_mmadp_t *adp)
{
	uioc_t	*kioc;
	int	i;

	mraid_mm_teardown_dma_pools(adp);

	for (i = 0; i < adp->max_kioc; i++) {

		kioc = adp->kioc_list + i;

		pci_pool_free(adp->pthru_dma_pool, kioc->pthru32,
				kioc->pthru32_h);
	}

	kfree(adp->kioc_list);
	kfree(adp->mbox_list);

	pci_pool_destroy(adp->pthru_dma_pool);


	return;
}


/**
 * mraid_mm_teardown_dma_pools - Free all per adapter dma buffers
 * @adp	: Adapter softstate
 */
static void
mraid_mm_teardown_dma_pools(mraid_mmadp_t *adp)
{
	int		i;
	mm_dmapool_t	*pool;

	for (i = 0; i < MAX_DMA_POOLS; i++) {

		pool = &adp->dma_pool_list[i];

		if (pool->handle) {

			if (pool->vaddr)
				pci_pool_free(pool->handle, pool->vaddr,
							pool->paddr);

			pci_pool_destroy(pool->handle);
			pool->handle = NULL;
		}
	}

	return;
}

/**
 * mraid_mm_init	- Module entry point
 */
static int __init
mraid_mm_init(void)
{
	int err;

	// Announce the driver version
	con_log(CL_ANN, (KERN_INFO "megaraid cmm: %s %s\n",
		LSI_COMMON_MOD_VERSION, LSI_COMMON_MOD_EXT_VERSION));

	err = misc_register(&megaraid_mm_dev);
	if (err < 0) {
		con_log(CL_ANN, ("megaraid cmm: cannot register misc device\n"));
		return err;
	}

	init_waitqueue_head(&wait_q);

	INIT_LIST_HEAD(&adapters_list_g);

	return 0;
}


#ifdef CONFIG_COMPAT
/**
 * mraid_mm_compat_ioctl	- 32bit to 64bit ioctl conversion routine
 * @filep	: file operations pointer (ignored)
 * @cmd		: ioctl command
 * @arg		: user ioctl packet
 */
static long
mraid_mm_compat_ioctl(struct file *filep, unsigned int cmd,
		      unsigned long arg)
{
	int err;

	err = mraid_mm_ioctl(NULL, filep, cmd, arg);

	return err;
}
#endif

/**
 * mraid_mm_exit	- Module exit point
 */
static void __exit
mraid_mm_exit(void)
{
	con_log(CL_DLEVEL1 , ("exiting common mod\n"));

	misc_deregister(&megaraid_mm_dev);
}

module_init(mraid_mm_init);
module_exit(mraid_mm_exit);

/* vi: set ts=8 sw=8 tw=78: */