summaryrefslogtreecommitdiffstats
path: root/tools/firewire/nosy-dump.c
blob: 0bad0a42d7725cc9069d27cd32776d014e36acc0 (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
/* -*- mode: c; c-basic-offset: 2 -*- */

/*
 * nosy-dump - Interface to snoop mode driver for TI PCILynx 1394 controllers
 * Copyright (C) 2002-2006 Kristian Høgsberg
 *
 * 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <endian.h>
#include <popt.h>
#include <poll.h>
#include <byteswap.h>
#include <termios.h>

#include <signal.h>

#include "list.h"
#include "nosy-user.h"
#include "nosy-dump.h"

enum {
  PACKET_FIELD_DETAIL		= 0x01,
  PACKET_FIELD_DATA_LENGTH	= 0x02,
  /* Marks the fields we print in transaction view. */
  PACKET_FIELD_TRANSACTION	= 0x04
};

static void
print_packet(uint32_t *data, size_t length);
static void
decode_link_packet(struct link_packet *packet, size_t length,
		   int include_flags, int exclude_flags);

static int   run = 1;
sig_t sys_sigint_handler;

static char *option_nosy_device = "/dev/nosy";
static char *option_view = "packet";
static char *option_output = NULL;
static char *option_input = NULL;
static int   option_hex;
static int   option_iso;
static int   option_cycle_start;
static int   option_version;
static int   option_verbose;

enum {
  VIEW_TRANSACTION,
  VIEW_PACKET,
  VIEW_STATS
};

static const struct poptOption options[] = {
  {
    longName:	"device",
    shortName:	'd',
    argInfo:	POPT_ARG_STRING,
    arg:	&option_nosy_device,
    descrip:	"Path to nosy device.",
    argDescrip:	"DEVICE"
  },
  {
    longName:	"view",
    argInfo:	POPT_ARG_STRING,
    arg:	&option_view,
    descrip:	"Specify view of bus traffic: packet, transaction or stats.",
    argDescrip:	"VIEW"
  },
  {
    longName:	"hex",
    shortName:	'x',
    argInfo:	POPT_ARG_NONE,
    arg:	&option_hex,
    descrip:	"Print each packet in hex.",
  },
  {
    longName:	"iso",
    argInfo:	POPT_ARG_NONE,
    arg:	&option_iso,
    descrip:	"Print iso packets.",
  },
  {
    longName:	"cycle-start",
    argInfo:	POPT_ARG_NONE,
    arg:	&option_cycle_start,
    descrip:	"Print cycle start packets.",
  },
  {
    longName:	"verbose",
    shortName:	'v',
    argInfo:	POPT_ARG_NONE,
    arg:	&option_verbose,
    descrip:	"Verbose packet view.",
  },
  {
    longName:	"output",
    shortName:	'o',
    argInfo:	POPT_ARG_STRING,
    arg:	&option_output,
    descrip:	"Log to output file.",
    argDescrip:	"FILENAME"
  },
  {
    longName:	"input",
    shortName:	'i',
    argInfo:	POPT_ARG_STRING,
    arg:	&option_input,
    descrip:	"Decode log from file.",
    argDescrip:	"FILENAME"
  },
  {
    longName:	"version",
    argInfo:	POPT_ARG_NONE,
    arg:	&option_version,
    descrip:	"Specify print version info.",
  },
  POPT_AUTOHELP
  POPT_TABLEEND
};

void 
sigint_handler(int signal_num)
{
  if (run == 1) {
    run = 0;
    /* Allow all Ctrl-C's except the first to interrupt the program in
     * the usual way.
     */
    signal(SIGINT, SIG_DFL);
  }
}

struct subaction *
subaction_create(uint32_t *data, size_t length)
{
  struct subaction *sa;

  /* we put the ack in the subaction struct for easy access. */
  sa = malloc(sizeof *sa - sizeof sa->packet + length);
  sa->ack = data[length / 4 - 1];
  sa->length = length;
  memcpy (&sa->packet, data, length);

  return sa;
}

void
subaction_destroy(struct subaction *sa)
{
  free(sa);
}

struct list pending_transaction_list =
  { &pending_transaction_list, &pending_transaction_list };

struct link_transaction *
link_transaction_lookup(int request_node, int response_node, int tlabel)
{
  struct link_transaction *t;

  list_for_each_entry(t, &pending_transaction_list, link) {
    if (t->request_node == request_node &&
	t->response_node == response_node &&
	t->tlabel == tlabel)
      return t;
  }

  t = malloc(sizeof *t);
  t->request_node = request_node;
  t->response_node = response_node;
  t->tlabel = tlabel;
  list_init(&t->request_list);
  list_init(&t->response_list);
  
  list_append(&pending_transaction_list, &t->link);
  
  return t;
}

void
link_transaction_destroy(struct link_transaction *t)
{
  while (!list_empty(&t->request_list)) {
    struct subaction *sa = list_head(&t->request_list, struct subaction, link);
    list_remove(&sa->link);
    subaction_destroy(sa);
  }    

  while (!list_empty(&t->response_list)) {
    struct subaction *sa = list_head(&t->response_list, struct subaction, link);
    list_remove(&sa->link);
    subaction_destroy(sa);
  }    
  
  free(t);
}

struct protocol_decoder {
  const char *name;
  int (*decode)(struct link_transaction *t);
};

static struct protocol_decoder protocol_decoders[] = {
  { "FCP", decode_fcp }
};

void
handle_transaction(struct link_transaction *t)
{
  struct subaction *sa;
  int i;

  for (i = 0; i < array_length(protocol_decoders); i++)
    if (protocol_decoders[i].decode(t))
      break;

  /* HACK: decode only fcp right now. */
  return;

  decode_link_packet(&t->request->packet, t->request->length,
		     PACKET_FIELD_TRANSACTION, 0);
  if (t->response)
    decode_link_packet(&t->response->packet, t->request->length,
		       PACKET_FIELD_TRANSACTION, 0);
  else
    printf("[no response]");

  if (option_verbose) {
    list_for_each_entry(sa, &t->request_list, link)
      print_packet((uint32_t *) &sa->packet, sa->length);
    list_for_each_entry(sa, &t->response_list, link)
      print_packet((uint32_t *) &sa->packet, sa->length);
  }
  printf("\r\n");

  link_transaction_destroy(t);
}

void
clear_pending_transaction_list(void)
{
  struct link_transaction *t;

  while (!list_empty(&pending_transaction_list)) {
    t = list_head(&pending_transaction_list, struct link_transaction, link);
    list_remove(&t->link);
    link_transaction_destroy(t);
    /* print unfinished transactions */
  }    
}

static const char * const tcode_names[] = {
  "write_quadlet_request",
  "write_block_request",
  "write_response",
  "reserved",
  "read_quadlet_request",
  "read_block_request",
  "read_quadlet_response",
  "read_block_response",
  "cycle_start",
  "lock_request",
  "iso_data",
  "lock_response"
};

static const char * const ack_names[] = {
  "no ack",
  "ack_complete",
  "ack_pending",
  "reserved (0x03)",
  "ack_busy_x",
  "ack_busy_a",
  "ack_busy_b",
  "reserved (0x07)",
  "reserved (0x08)",
  "reserved (0x09)",
  "reserved (0x0a)",
  "reserved (0x0b)",
  "reserved (0x0c)",
  "ack_data_error",
  "ack_type_error",
  "reserved (0x0f)",
};

static const char * const rcode_names[] = {
  "complete",
  "reserved (0x01)",
  "reserved (0x02)",
  "reserved (0x03)",
  "conflict_error",
  "data_error",
  "type_error",
  "address_error",
};

static const char * const retry_names[] = {
  "retry_1",
  "retry_x",
  "retry_a",
  "retry_b",
};

enum {
  PACKET_RESERVED,
  PACKET_REQUEST,
  PACKET_RESPONSE,
  PACKET_OTHER,
};

struct packet_info {
  const char *name;
  int type;
  int response_tcode;
  struct packet_field *fields;
  int field_count;
};

struct packet_field {
  const char *name;	/* Short name for field. */
  int offset;		/* Location of field, specified in bits.
			 * Negative means from end of packet */
  int width;		/* Width of field, 0 means use data_length. */
  int flags;		/* Show options. */
  const char * const *value_names;
};

#define COMMON_REQUEST_FIELDS					\
  { "dest", 0, 16, PACKET_FIELD_TRANSACTION },			\
  { "tl", 16, 6 },						\
  { "rt", 22, 2, PACKET_FIELD_DETAIL, retry_names },		\
  { "tcode", 24, 4, PACKET_FIELD_TRANSACTION, tcode_names },	\
  { "pri", 28, 4, PACKET_FIELD_DETAIL },			\
  { "src", 32, 16, PACKET_FIELD_TRANSACTION },			\
  { "offs", 48, 48, PACKET_FIELD_TRANSACTION }

#define COMMON_RESPONSE_FIELDS					\
  { "dest", 0, 16 },						\
  { "tl", 16, 6 },						\
  { "rt", 22, 2, PACKET_FIELD_DETAIL, retry_names },		\
  { "tcode", 24, 4, 0, tcode_names },				\
  { "pri", 28, 4, PACKET_FIELD_DETAIL },			\
  { "src", 32, 16 },						\
  { "rcode", 48, 4, PACKET_FIELD_TRANSACTION, rcode_names }

struct packet_field read_quadlet_request_fields[] = {
  COMMON_REQUEST_FIELDS,
  { "crc", 96, 32, PACKET_FIELD_DETAIL },
  { "ack", 156, 4, 0, ack_names }
};

struct packet_field read_quadlet_response_fields[] = {
  COMMON_RESPONSE_FIELDS,
  { "data", 96, 32, PACKET_FIELD_TRANSACTION },
  { "crc", 128, 32, PACKET_FIELD_DETAIL },
  { "ack", 188, 4, 0, ack_names }
};

struct packet_field read_block_request_fields[] = {
  COMMON_REQUEST_FIELDS,
  { "data_length", 96, 16, PACKET_FIELD_TRANSACTION },
  { "extended_tcode", 112, 16 },
  { "crc", 128, 32, PACKET_FIELD_DETAIL },
  { "ack", 188, 4, 0, ack_names },
};

struct packet_field block_response_fields[] = {
  COMMON_RESPONSE_FIELDS,
  { "data_length", 96, 16, PACKET_FIELD_DATA_LENGTH },
  { "extended_tcode", 112, 16 },
  { "crc", 128, 32, PACKET_FIELD_DETAIL },
  { "data", 160, 0, PACKET_FIELD_TRANSACTION },
  { "crc", -64, 32, PACKET_FIELD_DETAIL },
  { "ack", -4, 4, 0, ack_names }
};

struct packet_field write_quadlet_request_fields[] = {
  COMMON_REQUEST_FIELDS,
  { "data", 96, 32, PACKET_FIELD_TRANSACTION },
  { "ack", -4, 4, 0, ack_names }
};

struct packet_field block_request_fields[] = {
  COMMON_REQUEST_FIELDS,
  { "data_length", 96, 16, PACKET_FIELD_DATA_LENGTH | PACKET_FIELD_TRANSACTION },
  { "extended_tcode", 112, 16, PACKET_FIELD_TRANSACTION },
  { "crc", 128, 32, PACKET_FIELD_DETAIL },
  { "data", 160, 0, PACKET_FIELD_TRANSACTION },
  { "crc", -64, 32, PACKET_FIELD_DETAIL },
  { "ack", -4, 4, 0, ack_names }
};

struct packet_field write_response_fields[] = {
  COMMON_RESPONSE_FIELDS,
  { "reserved", 64, 32, PACKET_FIELD_DETAIL },
  { "ack", -4, 4, 0, ack_names }
};

struct packet_field iso_data_fields[] = {
  { "data_length", 0, 16, PACKET_FIELD_DATA_LENGTH },
  { "tag", 16, 2 },
  { "channel", 18, 6 },
  { "tcode", 24, 4, 0, tcode_names },
  { "sy", 28, 4 },
  { "crc", 32, 32, PACKET_FIELD_DETAIL },
  { "data", 64, 0 },
  { "crc", -64, 32, PACKET_FIELD_DETAIL },
  { "ack", -4, 4, 0, ack_names }
};

static struct packet_info packet_info[] = {
  {
    .name =		"write_quadlet_request",
    .type =		PACKET_REQUEST,
    .response_tcode =	TCODE_WRITE_RESPONSE,
    .fields =		write_quadlet_request_fields,
    .field_count =	array_length(write_quadlet_request_fields)
  },
  {
    .name =		"write_block_request",
    .type =		PACKET_REQUEST,
    .response_tcode = 	TCODE_WRITE_RESPONSE,
    .fields =		block_request_fields,
    .field_count =	array_length(block_request_fields)
  },
  {
    .name =		"write_response",
    .type =		PACKET_RESPONSE,
    .fields =		write_response_fields,
    .field_count =	array_length(write_response_fields)
  },
  {
    .name =		"reserved",
    .type =		PACKET_RESERVED,
  },
  {
    .name =		"read_quadlet_request",
    .type =		PACKET_REQUEST,
    .response_tcode = 	TCODE_READ_QUADLET_RESPONSE,
    .fields =		read_quadlet_request_fields,
    .field_count =	array_length(read_quadlet_request_fields)
  },
  {
    .name =		"read_block_request",
    .type =		PACKET_REQUEST,
    .response_tcode = 	TCODE_READ_BLOCK_RESPONSE,
    .fields =		read_block_request_fields,
    .field_count =	array_length(read_block_request_fields)
  },
  {
    .name =		"read_quadlet_response",
    .type =		PACKET_RESPONSE,
    .fields =		read_quadlet_response_fields,
    .field_count =	array_length(read_quadlet_response_fields)
  },
  {
    .name =		"read_block_response",
    .type =		PACKET_RESPONSE,
    .fields =		block_response_fields,
    .field_count =	array_length(block_response_fields)
  },
  {
    .name =		"cycle_start",
    .type =		PACKET_OTHER,
    .fields =		write_quadlet_request_fields,
    .field_count =	array_length(write_quadlet_request_fields)
  },
  {
    .name =		"lock_request",
    .type =		PACKET_REQUEST,
    .fields =		block_request_fields,
    .field_count =	array_length(block_request_fields)
  },
  {
    .name =		"iso_data",
    .type =		PACKET_OTHER,
    .fields =		iso_data_fields,
    .field_count =	array_length(iso_data_fields)
  },
  {
    .name =		"lock_response",
    .type =		PACKET_RESPONSE,
    .fields =		block_response_fields,
    .field_count =	array_length(block_response_fields)
  }
};

int
handle_packet(uint32_t *data, size_t length)
{
  if (length == 0) {
    printf("bus reset\r\n");
    clear_pending_transaction_list();
  }
  else if (length > sizeof(struct phy_packet)) {
    struct link_packet *p = (struct link_packet *) data;
    struct subaction *sa, *prev;
    struct link_transaction *t;

    switch (packet_info[p->common.tcode].type) {
    case PACKET_REQUEST:
      t = link_transaction_lookup(p->common.source, p->common.destination,
				  p->common.tlabel);
      sa = subaction_create(data, length);
      t->request = sa;

      if (!list_empty(&t->request_list)) {
	prev = list_tail(&t->request_list, struct subaction, link);

	if (!ACK_BUSY(prev->ack)) {
	  /* error, we should only see ack_busy_* before the
	   * ack_pending/ack_complete -- this is an ack_pending
	   * instead (ack_complete would have finished the
	   * transaction). */
	}
	
	if (prev->packet.common.tcode != sa->packet.common.tcode ||
	    prev->packet.common.tlabel != sa->packet.common.tlabel)
	  /* memcmp() ? */
	  /* error, these should match for retries. */;
      }

      list_append(&t->request_list, &sa->link);

      switch (sa->ack) {
      case ACK_COMPLETE:
	if (p->common.tcode != TCODE_WRITE_QUADLET &&
	    p->common.tcode != TCODE_WRITE_BLOCK)
	  /* error, unified transactions only allowed for write */;
	list_remove(&t->link);
	handle_transaction(t);
	break;

      case ACK_NO_ACK:
      case ACK_DATA_ERROR:
      case ACK_TYPE_ERROR:
	list_remove(&t->link);
	handle_transaction(t);
	break;

      case ACK_PENDING:
	/* request subaction phase over, wait for response. */
	break;

      case ACK_BUSY_X:
      case ACK_BUSY_A:
      case ACK_BUSY_B:
	/* ok, wait for retry. */
	/* check that retry protocol is respected. */
	break;
      }
      break;

    case PACKET_RESPONSE:
      t = link_transaction_lookup(p->common.destination, p->common.source,
				  p->common.tlabel);
      if (list_empty(&t->request_list)) {
	/* unsolicited response */
      }

      sa = subaction_create(data, length);
      t->response = sa;

      if (!list_empty(&t->response_list)) {
	prev = list_tail(&t->response_list, struct subaction, link);

	if (!ACK_BUSY(prev->ack))
	  /* error, we should only see ack_busy_* before the
	   * ack_pending/ack_complete */;

	if (prev->packet.common.tcode != sa->packet.common.tcode ||
	    prev->packet.common.tlabel != sa->packet.common.tlabel)
	  /* use memcmp() instead? */
	  /* error, these should match for retries. */;
      }
      else {
	prev = list_tail(&t->request_list, struct subaction, link);
	if (prev->ack != ACK_PENDING) {
	  /* error, should not get response unless last request got
	   * ack_pending. */
	}
	
	if (packet_info[prev->packet.common.tcode].response_tcode !=
	    sa->packet.common.tcode) {
	  /* error, tcode mismatch */
	}
      }
      
      list_append(&t->response_list, &sa->link);

      switch (sa->ack) {
      case ACK_COMPLETE:
      case ACK_NO_ACK:
      case ACK_DATA_ERROR:
      case ACK_TYPE_ERROR:
	list_remove(&t->link);
	handle_transaction(t);
	/* transaction complete, remove t from pending list. */
	break;

      case ACK_PENDING:
	/* error for responses. */
	break;

      case ACK_BUSY_X:
      case ACK_BUSY_A:
      case ACK_BUSY_B:
	/* no problem, wait for next retry */
	break;
      }
      
      break;

    case PACKET_OTHER:
    case PACKET_RESERVED:
      return 0;
    }
  }

  return 1;
}

unsigned int get_bits(struct link_packet *packet, int offset, int width)
{
  uint32_t *data = (uint32_t *) packet;
  uint32_t index, shift, mask;

  index = offset / 32 + 1;
  shift = 32 - (offset & 31) - width;
  mask = width == 32 ? ~0 : (1 << width) - 1;

  return (data[index] >> shift) & mask;
}

#if __BYTE_ORDER == __LITTLE_ENDIAN
#define byte_index(i) ((i) ^ 3)
#elif __BYTE_ORDER == __BIG_ENDIAN
#define byte_index(i) (i)
#else
#error unsupported byte order.
#endif

void dump_data(unsigned char *data, int length)
{
  int i, print_length;

  if (length > 128)
    print_length = 128;
  else
    print_length = length;

  for (i = 0; i < print_length; i++)
    printf("%s%02hhx",
	   (i % 4 == 0 && i != 0) ? " " : "",
	   data[byte_index(i)]);

  if (print_length < length)
    printf(" (%d more bytes)", length - print_length);
}

static void
decode_link_packet(struct link_packet *packet, size_t length,
		   int include_flags, int exclude_flags)
{
  struct packet_info *pi;
  int data_length = 0;
  int i;

  pi = &packet_info[packet->common.tcode];

  for (i = 0; i < pi->field_count; i++) {
    struct packet_field *f = &pi->fields[i];
    int offset;

    if (f->flags & exclude_flags)
      continue;
    if (include_flags && !(f->flags & include_flags))
      continue;

    if (f->offset < 0)
      offset = length * 8 + f->offset - 32;
    else
      offset = f->offset;

    if (f->value_names != NULL) {
      uint32_t bits;

      bits = get_bits(packet, offset, f->width);
      printf("%s", f->value_names[bits]);
    }
    else if (f->width == 0) {
      printf("%s=[", f->name);
      dump_data((unsigned char *) packet + (offset / 8 + 4), data_length);
      printf("]");
    }
    else {
      unsigned long long bits;
      int high_width, low_width;

      if ((offset & ~31) != ((offset + f->width - 1) & ~31)) {
	/* Bit field spans quadlet boundary. */
	high_width = ((offset + 31) & ~31) - offset;
	low_width = f->width - high_width;

	bits = get_bits(packet, offset, high_width);
	bits = (bits << low_width) |
	  get_bits(packet, offset + high_width, low_width);
      }
      else
	bits = get_bits(packet, offset, f->width);

      printf("%s=0x%0*llx", f->name, (f->width + 3) / 4, bits);

      if (f->flags & PACKET_FIELD_DATA_LENGTH)
	data_length = bits;
    }

    if (i < pi->field_count - 1)
      printf(", ");
  }
}

static void
print_packet(uint32_t *data, size_t length)
{
  int i;

  printf("%6u  ", data[0]);

  if (length == 4)
    printf("bus reset");
  else if (length < sizeof(struct phy_packet)) {
    printf("short packet: ");
    for (i = 1; i < length / 4; i++)
      printf("%s%08x", i == 0 ? "[" : " ", data[i]);
    printf("]");

  }
  else if (length == sizeof(struct phy_packet) && data[1] == ~data[2]) {
    struct phy_packet *pp = (struct phy_packet *) data;

    /* phy packet are 3 quadlets: the 1 quadlet payload,
     * the bitwise inverse of the payload and the snoop
     * mode ack */

    switch (pp->common.identifier) {
    case PHY_PACKET_CONFIGURATION:
      if (!pp->phy_config.set_root && !pp->phy_config.set_gap_count) {
	printf("ext phy config: phy_id=%02x", pp->phy_config.root_id);
      }
      else {
	printf("phy config:");
	if (pp->phy_config.set_root)
	  printf(" set_root_id=%02x", pp->phy_config.root_id);
	if (pp->phy_config.set_gap_count)
	  printf(" set_gap_count=%d", pp->phy_config.gap_count);
      }
      break;

    case PHY_PACKET_LINK_ON:
      printf("link-on packet, phy_id=%02x", pp->link_on.phy_id);
      break;

    case PHY_PACKET_SELF_ID:
      if (pp->self_id.extended) {
	printf("extended self id: phy_id=%02x, seq=%d",
	       pp->ext_self_id.phy_id, pp->ext_self_id.sequence);
      }
      else {
	static const char * const speed_names[] = {
	  "S100", "S200", "S400", "BETA"
	};
	printf("self id: phy_id=%02x, link %s, gap_count=%d, speed=%s%s%s", 
	       pp->self_id.phy_id,
	       (pp->self_id.link_active ? "active" : "not active"),
	       pp->self_id.gap_count,
	       speed_names[pp->self_id.phy_speed],
	       (pp->self_id.contender ? ", irm contender" : ""),
	       (pp->self_id.initiated_reset ? ", initiator" : ""));
	       
      }
      break;
    default:
      printf("unknown phy packet: ");
      for (i = 1; i < length / 4; i++)
	printf("%s%08x", i == 0 ? "[" : " ", data[i]);
      printf("]");
      break;
    }
  }
  else {
    struct link_packet *packet = (struct link_packet *) data;

    decode_link_packet(packet, length, 0,
		       option_verbose ? 0 : PACKET_FIELD_DETAIL);
  }

  if (option_hex) {
    printf("  [");
    dump_data((unsigned char *) data + 4, length - 4);
    printf("]");
  }

  printf("\r\n");
}

#define HIDE_CURSOR	"\033[?25l"
#define SHOW_CURSOR	"\033[?25h"
#define CLEAR		"\033[H\033[2J"

static void
print_stats(uint32_t *data, size_t length)
{
  static int bus_reset_count, short_packet_count, phy_packet_count;
  static int tcode_count[16];
  static struct timeval last_update;
  struct timeval now;
  int i;

  if (length == 0)
    bus_reset_count++;
  else if (length < sizeof(struct phy_packet))
    short_packet_count++;
  else if (length == sizeof(struct phy_packet) && data[1] == ~data[2])
    phy_packet_count++;
  else {
    struct link_packet *packet = (struct link_packet *) data;
    tcode_count[packet->common.tcode]++;
  }

  gettimeofday(&now, NULL);
  if (now.tv_sec <= last_update.tv_sec &&
      now.tv_usec < last_update.tv_usec + 500000)
    return;
  
  last_update = now;
  printf(CLEAR HIDE_CURSOR
	 "  bus resets              : %8d\n"
	 "  short packets           : %8d\n"
	 "  phy packets             : %8d\n",
	 bus_reset_count, short_packet_count, phy_packet_count);

  for (i = 0; i < array_length(packet_info); i++)
    if (packet_info[i].type != PACKET_RESERVED)
      printf("  %-24s: %8d\n", packet_info[i].name, tcode_count[i]);
  printf(SHOW_CURSOR "\n");
}

struct termios saved_attributes;

void
reset_input_mode (void)
{
  tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
}

void
set_input_mode (void)
{
  struct termios tattr;

  /* Make sure stdin is a terminal. */
  if (!isatty(STDIN_FILENO)) {
    fprintf(stderr, "Not a terminal.\n");
    exit(EXIT_FAILURE);
  }

  /* Save the terminal attributes so we can restore them later. */
  tcgetattr(STDIN_FILENO, &saved_attributes);
  atexit(reset_input_mode);

  /* Set the funny terminal modes. */
  tcgetattr(STDIN_FILENO, &tattr);
  tattr.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
  tattr.c_cc[VMIN] = 1;
  tattr.c_cc[VTIME] = 0;
  tcsetattr(STDIN_FILENO, TCSAFLUSH, &tattr);
}

int main(int argc, const char *argv[])
{
  int fd = -1;
  FILE *output = NULL, *input = NULL;
  poptContext con;
  int retval;
  int view;
  char c;
  struct pollfd pollfds[2];

  sys_sigint_handler = signal(SIGINT, sigint_handler);

  con = poptGetContext(NULL, argc, argv, options, 0);
  retval = poptGetNextOpt(con);
  if (retval < -1) {
    poptPrintUsage(con, stdout, 0);
    return -1;
  }

  if (option_version) {
    printf("dump tool for nosy sniffer, version %s\n", VERSION);
    return 0;
  }

  if (__BYTE_ORDER != __LITTLE_ENDIAN)
    fprintf(stderr, "warning: nosy has only been tested on little "
	    "endian machines\n");

  if (option_input != NULL) {
    input = fopen(option_input, "r");
    if (input == NULL) {
      fprintf(stderr, "Could not open %s, %m\n", option_input);
      return -1;
    }
  }
  else {
    fd = open(option_nosy_device, O_RDWR);
    if (fd < 0) {
      fprintf(stderr, "Could not open %s, %m\n", option_nosy_device);
      return -1;
    }
    set_input_mode();
  }

  if (strcmp(option_view, "transaction") == 0)
    view = VIEW_TRANSACTION;
  else if (strcmp(option_view, "stats") == 0)
    view = VIEW_STATS;
  else
    view = VIEW_PACKET;

  if (option_output) {
    output = fopen(option_output, "w");
    if (output == NULL) {
      fprintf(stderr, "Could not open %s, %m\n", option_output);
      return -1;
    }
  }

  setvbuf(stdout, NULL, _IOLBF, BUFSIZ);

  if (1) {
    uint32_t buf[128 * 1024];
    uint32_t filter;
    int length;

    filter = ~0;
    if (!option_iso)
      filter &= ~(1 <<TCODE_ISO_DATA);
    if (!option_cycle_start)
      filter &= ~(1 << TCODE_CYCLE_START);
    if (view == VIEW_STATS)
      filter = ~(1 << TCODE_CYCLE_START);

    ioctl(fd, NOSY_IOC_FILTER, filter);

    ioctl(fd, NOSY_IOC_START);

    pollfds[0].fd = fd;
    pollfds[0].events = POLLIN;
    pollfds[1].fd = STDIN_FILENO;
    pollfds[1].events = POLLIN;

    while (run) {
      if (input != NULL) {
	if (fread(&length, sizeof length, 1, input) != 1)
	  return 0;
	fread(buf, 1, length, input);
      }
      else {
	poll(pollfds, 2, -1);
	if (pollfds[1].revents) {
	  read(STDIN_FILENO, &c, sizeof c);
	  switch (c) {
	  case 'q':
	    if (output != NULL)
	      fclose(output);
	    return 0;
	  }
	}

	if (pollfds[0].revents)
	  length = read(fd, buf, sizeof buf);
	else
	  continue;
      }

      if (output != NULL) {
	fwrite(&length, sizeof length, 1, output);
	fwrite(buf, 1, length, output);
      }

      switch (view) {
      case VIEW_TRANSACTION:
	handle_packet(buf, length);
	break;
      case VIEW_PACKET:
	print_packet(buf, length);
	break;
      case VIEW_STATS:
	print_stats(buf, length);
	break;
      }
    }
  }
  else
    poptPrintUsage(con, stdout, 0);

  if (output != NULL)
    fclose(output);

  close(fd);

  poptFreeContext(con);

  return 0;
}