aboutsummaryrefslogtreecommitdiff
path: root/arch/ia64/kernel/palinfo.c
blob: e5c57f413ca27b197ef0edeb2166efde99d113cb (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
/*
 * palinfo.c
 *
 * Prints processor specific information reported by PAL.
 * This code is based on specification of PAL as of the
 * Intel IA-64 Architecture Software Developer's Manual v1.0.
 *
 *
 * Copyright (C) 2000-2001, 2003 Hewlett-Packard Co
 *	Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2004 Intel Corporation
 *  Ashok Raj <ashok.raj@intel.com>
 *
 * 05/26/2000	S.Eranian	initial release
 * 08/21/2000	S.Eranian	updated to July 2000 PAL specs
 * 02/05/2001   S.Eranian	fixed module support
 * 10/23/2001	S.Eranian	updated pal_perf_mon_info bug fixes
 * 03/24/2004	Ashok Raj	updated to work with CPU Hotplug
 * 10/26/2006   Russ Anderson	updated processor features to rev 2.2 spec
 */
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/efi.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>

#include <asm/pal.h>
#include <asm/sal.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <linux/smp.h>

MODULE_AUTHOR("Stephane Eranian <eranian@hpl.hp.com>");
MODULE_DESCRIPTION("/proc interface to IA-64 PAL");
MODULE_LICENSE("GPL");

#define PALINFO_VERSION "0.5"

typedef int (*palinfo_func_t)(char*);

typedef struct {
	const char		*name;		/* name of the proc entry */
	palinfo_func_t		proc_read;	/* function to call for reading */
	struct proc_dir_entry	*entry;		/* registered entry (removal) */
} palinfo_entry_t;


/*
 *  A bunch of string array to get pretty printing
 */

static char *cache_types[] = {
	"",			/* not used */
	"Instruction",
	"Data",
	"Data/Instruction"	/* unified */
};

static const char *cache_mattrib[]={
	"WriteThrough",
	"WriteBack",
	"",		/* reserved */
	""		/* reserved */
};

static const char *cache_st_hints[]={
	"Temporal, level 1",
	"Reserved",
	"Reserved",
	"Non-temporal, all levels",
	"Reserved",
	"Reserved",
	"Reserved",
	"Reserved"
};

static const char *cache_ld_hints[]={
	"Temporal, level 1",
	"Non-temporal, level 1",
	"Reserved",
	"Non-temporal, all levels",
	"Reserved",
	"Reserved",
	"Reserved",
	"Reserved"
};

static const char *rse_hints[]={
	"enforced lazy",
	"eager stores",
	"eager loads",
	"eager loads and stores"
};

#define RSE_HINTS_COUNT ARRAY_SIZE(rse_hints)

static const char *mem_attrib[]={
	"WB",		/* 000 */
	"SW",		/* 001 */
	"010",		/* 010 */
	"011",		/* 011 */
	"UC",		/* 100 */
	"UCE",		/* 101 */
	"WC",		/* 110 */
	"NaTPage"	/* 111 */
};

/*
 * Take a 64bit vector and produces a string such that
 * if bit n is set then 2^n in clear text is generated. The adjustment
 * to the right unit is also done.
 *
 * Input:
 *	- a pointer to a buffer to hold the string
 *	- a 64-bit vector
 * Ouput:
 *	- a pointer to the end of the buffer
 *
 */
static char *
bitvector_process(char *p, u64 vector)
{
	int i,j;
	const char *units[]={ "", "K", "M", "G", "T" };

	for (i=0, j=0; i < 64; i++ , j=i/10) {
		if (vector & 0x1) {
			p += sprintf(p, "%d%s ", 1 << (i-j*10), units[j]);
		}
		vector >>= 1;
	}
	return p;
}

/*
 * Take a 64bit vector and produces a string such that
 * if bit n is set then register n is present. The function
 * takes into account consecutive registers and prints out ranges.
 *
 * Input:
 *	- a pointer to a buffer to hold the string
 *	- a 64-bit vector
 * Ouput:
 *	- a pointer to the end of the buffer
 *
 */
static char *
bitregister_process(char *p, u64 *reg_info, int max)
{
	int i, begin, skip = 0;
	u64 value = reg_info[0];

	value >>= i = begin = ffs(value) - 1;

	for(; i < max; i++ ) {

		if (i != 0 && (i%64) == 0) value = *++reg_info;

		if ((value & 0x1) == 0 && skip == 0) {
			if (begin  <= i - 2)
				p += sprintf(p, "%d-%d ", begin, i-1);
			else
				p += sprintf(p, "%d ", i-1);
			skip  = 1;
			begin = -1;
		} else if ((value & 0x1) && skip == 1) {
			skip = 0;
			begin = i;
		}
		value >>=1;
	}
	if (begin > -1) {
		if (begin < 127)
			p += sprintf(p, "%d-127", begin);
		else
			p += sprintf(p, "127");
	}

	return p;
}

static int
power_info(char *page)
{
	s64 status;
	char *p = page;
	u64 halt_info_buffer[8];
	pal_power_mgmt_info_u_t *halt_info =(pal_power_mgmt_info_u_t *)halt_info_buffer;
	int i;

	status = ia64_pal_halt_info(halt_info);
	if (status != 0) return 0;

	for (i=0; i < 8 ; i++ ) {
		if (halt_info[i].pal_power_mgmt_info_s.im == 1) {
			p += sprintf(p,	"Power level %d:\n"
				     "\tentry_latency       : %d cycles\n"
				     "\texit_latency        : %d cycles\n"
				     "\tpower consumption   : %d mW\n"
				     "\tCache+TLB coherency : %s\n", i,
				     halt_info[i].pal_power_mgmt_info_s.entry_latency,
				     halt_info[i].pal_power_mgmt_info_s.exit_latency,
				     halt_info[i].pal_power_mgmt_info_s.power_consumption,
				     halt_info[i].pal_power_mgmt_info_s.co ? "Yes" : "No");
		} else {
			p += sprintf(p,"Power level %d: not implemented\n",i);
		}
	}
	return p - page;
}

static int
cache_info(char *page)
{
	char *p = page;
	u64 i, levels, unique_caches;
	pal_cache_config_info_t cci;
	int j, k;
	s64 status;

	if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
		printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
		return 0;
	}

	p += sprintf(p, "Cache levels  : %ld\nUnique caches : %ld\n\n", levels, unique_caches);

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

		for (j=2; j >0 ; j--) {

			/* even without unification some level may not be present */
			if ((status=ia64_pal_cache_config_info(i,j, &cci)) != 0) {
				continue;
			}
			p += sprintf(p,
				     "%s Cache level %lu:\n"
				     "\tSize           : %u bytes\n"
				     "\tAttributes     : ",
				     cache_types[j+cci.pcci_unified], i+1,
				     cci.pcci_cache_size);

			if (cci.pcci_unified) p += sprintf(p, "Unified ");

			p += sprintf(p, "%s\n", cache_mattrib[cci.pcci_cache_attr]);

			p += sprintf(p,
				     "\tAssociativity  : %d\n"
				     "\tLine size      : %d bytes\n"
				     "\tStride         : %d bytes\n",
				     cci.pcci_assoc, 1<<cci.pcci_line_size, 1<<cci.pcci_stride);
			if (j == 1)
				p += sprintf(p, "\tStore latency  : N/A\n");
			else
				p += sprintf(p, "\tStore latency  : %d cycle(s)\n",
						cci.pcci_st_latency);

			p += sprintf(p,
				     "\tLoad latency   : %d cycle(s)\n"
				     "\tStore hints    : ", cci.pcci_ld_latency);

			for(k=0; k < 8; k++ ) {
				if ( cci.pcci_st_hints & 0x1)
					p += sprintf(p, "[%s]", cache_st_hints[k]);
				cci.pcci_st_hints >>=1;
			}
			p += sprintf(p, "\n\tLoad hints     : ");

			for(k=0; k < 8; k++ ) {
				if (cci.pcci_ld_hints & 0x1)
					p += sprintf(p, "[%s]", cache_ld_hints[k]);
				cci.pcci_ld_hints >>=1;
			}
			p += sprintf(p,
				     "\n\tAlias boundary : %d byte(s)\n"
				     "\tTag LSB        : %d\n"
				     "\tTag MSB        : %d\n",
				     1<<cci.pcci_alias_boundary, cci.pcci_tag_lsb,
				     cci.pcci_tag_msb);

			/* when unified, data(j=2) is enough */
			if (cci.pcci_unified) break;
		}
	}
	return p - page;
}


static int
vm_info(char *page)
{
	char *p = page;
	u64 tr_pages =0, vw_pages=0, tc_pages;
	u64 attrib;
	pal_vm_info_1_u_t vm_info_1;
	pal_vm_info_2_u_t vm_info_2;
	pal_tc_info_u_t	tc_info;
	ia64_ptce_info_t ptce;
	const char *sep;
	int i, j;
	s64 status;

	if ((status = ia64_pal_vm_summary(&vm_info_1, &vm_info_2)) !=0) {
		printk(KERN_ERR "ia64_pal_vm_summary=%ld\n", status);
	} else {

		p += sprintf(p,
		     "Physical Address Space         : %d bits\n"
		     "Virtual Address Space          : %d bits\n"
		     "Protection Key Registers(PKR)  : %d\n"
		     "Implemented bits in PKR.key    : %d\n"
		     "Hash Tag ID                    : 0x%x\n"
		     "Size of RR.rid                 : %d\n"
		     "Max Purges                     : ",
		     vm_info_1.pal_vm_info_1_s.phys_add_size,
		     vm_info_2.pal_vm_info_2_s.impl_va_msb+1,
		     vm_info_1.pal_vm_info_1_s.max_pkr+1,
		     vm_info_1.pal_vm_info_1_s.key_size,
		     vm_info_1.pal_vm_info_1_s.hash_tag_id,
		     vm_info_2.pal_vm_info_2_s.rid_size);
		if (vm_info_2.pal_vm_info_2_s.max_purges == PAL_MAX_PURGES)
			p += sprintf(p, "unlimited\n");
		else
			p += sprintf(p, "%d\n",
		     		vm_info_2.pal_vm_info_2_s.max_purges ?
				vm_info_2.pal_vm_info_2_s.max_purges : 1);
	}

	if (ia64_pal_mem_attrib(&attrib) == 0) {
		p += sprintf(p, "Supported memory attributes    : ");
		sep = "";
		for (i = 0; i < 8; i++) {
			if (attrib & (1 << i)) {
				p += sprintf(p, "%s%s", sep, mem_attrib[i]);
				sep = ", ";
			}
		}
		p += sprintf(p, "\n");
	}

	if ((status = ia64_pal_vm_page_size(&tr_pages, &vw_pages)) !=0) {
		printk(KERN_ERR "ia64_pal_vm_page_size=%ld\n", status);
	} else {

		p += sprintf(p,
			     "\nTLB walker                     : %simplemented\n"
			     "Number of DTR                  : %d\n"
			     "Number of ITR                  : %d\n"
			     "TLB insertable page sizes      : ",
			     vm_info_1.pal_vm_info_1_s.vw ? "" : "not ",
			     vm_info_1.pal_vm_info_1_s.max_dtr_entry+1,
			     vm_info_1.pal_vm_info_1_s.max_itr_entry+1);


		p = bitvector_process(p, tr_pages);

		p += sprintf(p, "\nTLB purgeable page sizes       : ");

		p = bitvector_process(p, vw_pages);
	}
	if ((status=ia64_get_ptce(&ptce)) != 0) {
		printk(KERN_ERR "ia64_get_ptce=%ld\n", status);
	} else {
		p += sprintf(p,
		     "\nPurge base address             : 0x%016lx\n"
		     "Purge outer loop count         : %d\n"
		     "Purge inner loop count         : %d\n"
		     "Purge outer loop stride        : %d\n"
		     "Purge inner loop stride        : %d\n",
		     ptce.base, ptce.count[0], ptce.count[1],
		     ptce.stride[0], ptce.stride[1]);

		p += sprintf(p,
		     "TC Levels                      : %d\n"
		     "Unique TC(s)                   : %d\n",
		     vm_info_1.pal_vm_info_1_s.num_tc_levels,
		     vm_info_1.pal_vm_info_1_s.max_unique_tcs);

		for(i=0; i < vm_info_1.pal_vm_info_1_s.num_tc_levels; i++) {
			for (j=2; j>0 ; j--) {
				tc_pages = 0; /* just in case */


				/* even without unification, some levels may not be present */
				if ((status=ia64_pal_vm_info(i,j, &tc_info, &tc_pages)) != 0) {
					continue;
				}

				p += sprintf(p,
				     "\n%s Translation Cache Level %d:\n"
				     "\tHash sets           : %d\n"
				     "\tAssociativity       : %d\n"
				     "\tNumber of entries   : %d\n"
				     "\tFlags               : ",
				     cache_types[j+tc_info.tc_unified], i+1,
				     tc_info.tc_num_sets,
				     tc_info.tc_associativity,
				     tc_info.tc_num_entries);

				if (tc_info.tc_pf)
					p += sprintf(p, "PreferredPageSizeOptimized ");
				if (tc_info.tc_unified)
					p += sprintf(p, "Unified ");
				if (tc_info.tc_reduce_tr)
					p += sprintf(p, "TCReduction");

				p += sprintf(p, "\n\tSupported page sizes: ");

				p = bitvector_process(p, tc_pages);

				/* when unified date (j=2) is enough */
				if (tc_info.tc_unified)
					break;
			}
		}
	}
	p += sprintf(p, "\n");

	return p - page;
}


static int
register_info(char *page)
{
	char *p = page;
	u64 reg_info[2];
	u64 info;
	u64 phys_stacked;
	pal_hints_u_t hints;
	u64 iregs, dregs;
	char *info_type[]={
		"Implemented AR(s)",
		"AR(s) with read side-effects",
		"Implemented CR(s)",
		"CR(s) with read side-effects",
	};

	for(info=0; info < 4; info++) {

		if (ia64_pal_register_info(info, &reg_info[0], &reg_info[1]) != 0) return 0;

		p += sprintf(p, "%-32s : ", info_type[info]);

		p = bitregister_process(p, reg_info, 128);

		p += sprintf(p, "\n");
	}

	if (ia64_pal_rse_info(&phys_stacked, &hints) == 0) {

	p += sprintf(p,
		     "RSE stacked physical registers   : %ld\n"
		     "RSE load/store hints             : %ld (%s)\n",
		     phys_stacked, hints.ph_data,
		     hints.ph_data < RSE_HINTS_COUNT ? rse_hints[hints.ph_data]: "(??)");
	}
	if (ia64_pal_debug_info(&iregs, &dregs))
		return 0;

	p += sprintf(p,
		     "Instruction debug register pairs : %ld\n"
		     "Data debug register pairs        : %ld\n", iregs, dregs);

	return p - page;
}

static char *proc_features_0[]={		/* Feature set 0 */
	NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
	NULL,NULL,NULL,NULL,NULL,NULL,NULL, NULL,NULL,
	NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
	NULL,NULL,NULL,NULL,NULL, NULL,NULL,NULL,NULL,
	"Unimplemented instruction address fault",
	"INIT, PMI, and LINT pins",
	"Simple unimplemented instr addresses",
	"Variable P-state performance",
	"Virtual machine features implemented",
	"XIP,XPSR,XFS implemented",
	"XR1-XR3 implemented",
	"Disable dynamic predicate prediction",
	"Disable processor physical number",
	"Disable dynamic data cache prefetch",
	"Disable dynamic inst cache prefetch",
	"Disable dynamic branch prediction",
	NULL, NULL, NULL, NULL,
	"Disable P-states",
	"Enable MCA on Data Poisoning",
	"Enable vmsw instruction",
	"Enable extern environmental notification",
	"Disable BINIT on processor time-out",
	"Disable dynamic power management (DPM)",
	"Disable coherency",
	"Disable cache",
	"Enable CMCI promotion",
	"Enable MCA to BINIT promotion",
	"Enable MCA promotion",
	"Enable BERR promotion"
};

static char *proc_features_16[]={		/* Feature set 16 */
	"Disable ETM",
	"Enable ETM",
	"Enable MCA on half-way timer",
	"Enable snoop WC",
	NULL,
	"Enable Fast Deferral",
	"Disable MCA on memory aliasing",
	"Enable RSB",
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	"DP system processor",
	"Low Voltage",
	"HT supported",
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	NULL, NULL, NULL, NULL, NULL
};

static char **proc_features[]={
	proc_features_0,
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	NULL, NULL, NULL, NULL,
	proc_features_16,
	NULL, NULL, NULL, NULL,
};

static char *
feature_set_info(char *page, u64 avail, u64 status, u64 control, u64 set)
{
	char *p = page;
	char **vf, **v;
	int i;

	vf = v = proc_features[set];
	for(i=0; i < 64; i++, avail >>=1, status >>=1, control >>=1) {

		if (!(control))		/* No remaining bits set */
			break;
		if (!(avail & 0x1))	/* Print only bits that are available */
			continue;
		if (vf)
			v = vf + i;
		if ( v && *v ) {
			p += sprintf(p, "%-40s : %s %s\n", *v,
				avail & 0x1 ? (status & 0x1 ?
						"On " : "Off"): "",
				avail & 0x1 ? (control & 0x1 ?
						"Ctrl" : "NoCtrl"): "");
		} else {
			p += sprintf(p, "Feature set %2ld bit %2d\t\t\t"
					" : %s %s\n",
				set, i,
				avail & 0x1 ? (status & 0x1 ?
						"On " : "Off"): "",
				avail & 0x1 ? (control & 0x1 ?
						"Ctrl" : "NoCtrl"): "");
		}
	}
	return p;
}

static int
processor_info(char *page)
{
	char *p = page;
	u64 avail=1, status=1, control=1, feature_set=0;
	s64 ret;

	do {
		ret = ia64_pal_proc_get_features(&avail, &status, &control,
						feature_set);
		if (ret < 0) {
			return p - page;
		}
		if (ret == 1) {
			feature_set++;
			continue;
		}

		p = feature_set_info(p, avail, status, control, feature_set);

		feature_set++;
	} while(1);

	return p - page;
}

static const char *bus_features[]={
	NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
	NULL,NULL,NULL,NULL,NULL,NULL,NULL, NULL,NULL,
	NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
	NULL,NULL,
	"Request  Bus Parking",
	"Bus Lock Mask",
	"Enable Half Transfer",
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	NULL, NULL, NULL, NULL,
	"Enable Cache Line Repl. Shared",
	"Enable Cache Line Repl. Exclusive",
	"Disable Transaction Queuing",
	"Disable Response Error Checking",
	"Disable Bus Error Checking",
	"Disable Bus Requester Internal Error Signalling",
	"Disable Bus Requester Error Signalling",
	"Disable Bus Initialization Event Checking",
	"Disable Bus Initialization Event Signalling",
	"Disable Bus Address Error Checking",
	"Disable Bus Address Error Signalling",
	"Disable Bus Data Error Checking"
};


static int
bus_info(char *page)
{
	char *p = page;
	const char **v = bus_features;
	pal_bus_features_u_t av, st, ct;
	u64 avail, status, control;
	int i;
	s64 ret;

	if ((ret=ia64_pal_bus_get_features(&av, &st, &ct)) != 0) return 0;

	avail   = av.pal_bus_features_val;
	status  = st.pal_bus_features_val;
	control = ct.pal_bus_features_val;

	for(i=0; i < 64; i++, v++, avail >>=1, status >>=1, control >>=1) {
		if ( ! *v ) continue;
		p += sprintf(p, "%-48s : %s%s %s\n", *v,
				avail & 0x1 ? "" : "NotImpl",
				avail & 0x1 ? (status  & 0x1 ? "On" : "Off"): "",
				avail & 0x1 ? (control & 0x1 ? "Ctrl" : "NoCtrl"): "");
	}
	return p - page;
}

static int
version_info(char *page)
{
	pal_version_u_t min_ver, cur_ver;
	char *p = page;

	if (ia64_pal_version(&min_ver, &cur_ver) != 0)
		return 0;

	p += sprintf(p,
		     "PAL_vendor : 0x%02x (min=0x%02x)\n"
		     "PAL_A      : %02x.%02x (min=%02x.%02x)\n"
		     "PAL_B      : %02x.%02x (min=%02x.%02x)\n",
		     cur_ver.pal_version_s.pv_pal_vendor,
		     min_ver.pal_version_s.pv_pal_vendor,
		     cur_ver.pal_version_s.pv_pal_a_model,
		     cur_ver.pal_version_s.pv_pal_a_rev,
		     min_ver.pal_version_s.pv_pal_a_model,
		     min_ver.pal_version_s.pv_pal_a_rev,
		     cur_ver.pal_version_s.pv_pal_b_model,
		     cur_ver.pal_version_s.pv_pal_b_rev,
		     min_ver.pal_version_s.pv_pal_b_model,
		     min_ver.pal_version_s.pv_pal_b_rev);
	return p - page;
}

static int
perfmon_info(char *page)
{
	char *p = page;
	u64 pm_buffer[16];
	pal_perf_mon_info_u_t pm_info;

	if (ia64_pal_perf_mon_info(pm_buffer, &pm_info) != 0) return 0;

	p += sprintf(p,
		     "PMC/PMD pairs                 : %d\n"
		     "Counter width                 : %d bits\n"
		     "Cycle event number            : %d\n"
		     "Retired event number          : %d\n"
		     "Implemented PMC               : ",
		     pm_info.pal_perf_mon_info_s.generic, pm_info.pal_perf_mon_info_s.width,
		     pm_info.pal_perf_mon_info_s.cycles, pm_info.pal_perf_mon_info_s.retired);

	p = bitregister_process(p, pm_buffer, 256);
	p += sprintf(p, "\nImplemented PMD               : ");
	p = bitregister_process(p, pm_buffer+4, 256);
	p += sprintf(p, "\nCycles count capable          : ");
	p = bitregister_process(p, pm_buffer+8, 256);
	p += sprintf(p, "\nRetired bundles count capable : ");

#ifdef CONFIG_ITANIUM
	/*
	 * PAL_PERF_MON_INFO reports that only PMC4 can be used to count CPU_CYCLES
	 * which is wrong, both PMC4 and PMD5 support it.
	 */
	if (pm_buffer[12] == 0x10) pm_buffer[12]=0x30;
#endif

	p = bitregister_process(p, pm_buffer+12, 256);

	p += sprintf(p, "\n");

	return p - page;
}

static int
frequency_info(char *page)
{
	char *p = page;
	struct pal_freq_ratio proc, itc, bus;
	u64 base;

	if (ia64_pal_freq_base(&base) == -1)
		p += sprintf(p, "Output clock            : not implemented\n");
	else
		p += sprintf(p, "Output clock            : %ld ticks/s\n", base);

	if (ia64_pal_freq_ratios(&proc, &bus, &itc) != 0) return 0;

	p += sprintf(p,
		     "Processor/Clock ratio   : %d/%d\n"
		     "Bus/Clock ratio         : %d/%d\n"
		     "ITC/Clock ratio         : %d/%d\n",
		     proc.num, proc.den, bus.num, bus.den, itc.num, itc.den);

	return p - page;
}

static int
tr_info(char *page)
{
	char *p = page;
	s64 status;
	pal_tr_valid_u_t tr_valid;
	u64 tr_buffer[4];
	pal_vm_info_1_u_t vm_info_1;
	pal_vm_info_2_u_t vm_info_2;
	u64 i, j;
	u64 max[3], pgm;
	struct ifa_reg {
		u64 valid:1;
		u64 ig:11;
		u64 vpn:52;
	} *ifa_reg;
	struct itir_reg {
		u64 rv1:2;
		u64 ps:6;
		u64 key:24;
		u64 rv2:32;
	} *itir_reg;
	struct gr_reg {
		u64 p:1;
		u64 rv1:1;
		u64 ma:3;
		u64 a:1;
		u64 d:1;
		u64 pl:2;
		u64 ar:3;
		u64 ppn:38;
		u64 rv2:2;
		u64 ed:1;
		u64 ig:11;
	} *gr_reg;
	struct rid_reg {
		u64 ig1:1;
		u64 rv1:1;
		u64 ig2:6;
		u64 rid:24;
		u64 rv2:32;
	} *rid_reg;

	if ((status = ia64_pal_vm_summary(&vm_info_1, &vm_info_2)) !=0) {
		printk(KERN_ERR "ia64_pal_vm_summary=%ld\n", status);
		return 0;
	}
	max[0] = vm_info_1.pal_vm_info_1_s.max_itr_entry+1;
	max[1] = vm_info_1.pal_vm_info_1_s.max_dtr_entry+1;

	for (i=0; i < 2; i++ ) {
		for (j=0; j < max[i]; j++) {

		status = ia64_pal_tr_read(j, i, tr_buffer, &tr_valid);
		if (status != 0) {
			printk(KERN_ERR "palinfo: pal call failed on tr[%lu:%lu]=%ld\n",
			       i, j, status);
			continue;
		}

		ifa_reg  = (struct ifa_reg *)&tr_buffer[2];

		if (ifa_reg->valid == 0) continue;

		gr_reg   = (struct gr_reg *)tr_buffer;
		itir_reg = (struct itir_reg *)&tr_buffer[1];
		rid_reg  = (struct rid_reg *)&tr_buffer[3];

		pgm	 = -1 << (itir_reg->ps - 12);
		p += sprintf(p,
			     "%cTR%lu: av=%d pv=%d dv=%d mv=%d\n"
			     "\tppn  : 0x%lx\n"
			     "\tvpn  : 0x%lx\n"
			     "\tps   : ",
			     "ID"[i], j,
			     tr_valid.pal_tr_valid_s.access_rights_valid,
			     tr_valid.pal_tr_valid_s.priv_level_valid,
			     tr_valid.pal_tr_valid_s.dirty_bit_valid,
			     tr_valid.pal_tr_valid_s.mem_attr_valid,
			     (gr_reg->ppn & pgm)<< 12, (ifa_reg->vpn & pgm)<< 12);

		p = bitvector_process(p, 1<< itir_reg->ps);

		p += sprintf(p,
			     "\n\tpl   : %d\n"
			     "\tar   : %d\n"
			     "\trid  : %x\n"
			     "\tp    : %d\n"
			     "\tma   : %d\n"
			     "\td    : %d\n",
			     gr_reg->pl, gr_reg->ar, rid_reg->rid, gr_reg->p, gr_reg->ma,
			     gr_reg->d);
		}
	}
	return p - page;
}



/*
 * List {name,function} pairs for every entry in /proc/palinfo/cpu*
 */
static palinfo_entry_t palinfo_entries[]={
	{ "version_info",	version_info, },
	{ "vm_info",		vm_info, },
	{ "cache_info",		cache_info, },
	{ "power_info",		power_info, },
	{ "register_info",	register_info, },
	{ "processor_info",	processor_info, },
	{ "perfmon_info",	perfmon_info, },
	{ "frequency_info",	frequency_info, },
	{ "bus_info",		bus_info },
	{ "tr_info",		tr_info, }
};

#define NR_PALINFO_ENTRIES	(int) ARRAY_SIZE(palinfo_entries)

/*
 * this array is used to keep track of the proc entries we create. This is
 * required in the module mode when we need to remove all entries. The procfs code
 * does not do recursion of deletion
 *
 * Notes:
 *	- +1 accounts for the cpuN directory entry in /proc/pal
 */
#define NR_PALINFO_PROC_ENTRIES	(NR_CPUS*(NR_PALINFO_ENTRIES+1))

static struct proc_dir_entry *palinfo_proc_entries[NR_PALINFO_PROC_ENTRIES];
static struct proc_dir_entry *palinfo_dir;

/*
 * This data structure is used to pass which cpu,function is being requested
 * It must fit in a 64bit quantity to be passed to the proc callback routine
 *
 * In SMP mode, when we get a request for another CPU, we must call that
 * other CPU using IPI and wait for the result before returning.
 */
typedef union {
	u64 value;
	struct {
		unsigned	req_cpu: 32;	/* for which CPU this info is */
		unsigned	func_id: 32;	/* which function is requested */
	} pal_func_cpu;
} pal_func_cpu_u_t;

#define req_cpu	pal_func_cpu.req_cpu
#define func_id pal_func_cpu.func_id

#ifdef CONFIG_SMP

/*
 * used to hold information about final function to call
 */
typedef struct {
	palinfo_func_t	func;	/* pointer to function to call */
	char		*page;	/* buffer to store results */
	int		ret;	/* return value from call */
} palinfo_smp_data_t;


/*
 * this function does the actual final call and he called
 * from the smp code, i.e., this is the palinfo callback routine
 */
static void
palinfo_smp_call(void *info)
{
	palinfo_smp_data_t *data = (palinfo_smp_data_t *)info;
	data->ret = (*data->func)(data->page);
}

/*
 * function called to trigger the IPI, we need to access a remote CPU
 * Return:
 *	0 : error or nothing to output
 *	otherwise how many bytes in the "page" buffer were written
 */
static
int palinfo_handle_smp(pal_func_cpu_u_t *f, char *page)
{
	palinfo_smp_data_t ptr;
	int ret;

	ptr.func = palinfo_entries[f->func_id].proc_read;
	ptr.page = page;
	ptr.ret  = 0; /* just in case */


	/* will send IPI to other CPU and wait for completion of remote call */
	if ((ret=smp_call_function_single(f->req_cpu, palinfo_smp_call, &ptr, 1))) {
		printk(KERN_ERR "palinfo: remote CPU call from %d to %d on function %d: "
		       "error %d\n", smp_processor_id(), f->req_cpu, f->func_id, ret);
		return 0;
	}
	return ptr.ret;
}
#else /* ! CONFIG_SMP */
static
int palinfo_handle_smp(pal_func_cpu_u_t *f, char *page)
{
	printk(KERN_ERR "palinfo: should not be called with non SMP kernel\n");
	return 0;
}
#endif /* CONFIG_SMP */

/*
 * Entry point routine: all calls go through this function
 */
static int
palinfo_read_entry(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	int len=0;
	pal_func_cpu_u_t *f = (pal_func_cpu_u_t *)&data;

	/*
	 * in SMP mode, we may need to call another CPU to get correct
	 * information. PAL, by definition, is processor specific
	 */
	if (f->req_cpu == get_cpu())
		len = (*palinfo_entries[f->func_id].proc_read)(page);
	else
		len = palinfo_handle_smp(f, page);

	put_cpu();

	if (len <= off+count) *eof = 1;

	*start = page + off;
	len   -= off;

	if (len>count) len = count;
	if (len<0) len = 0;

	return len;
}

static void __cpuinit
create_palinfo_proc_entries(unsigned int cpu)
{
#	define CPUSTR	"cpu%d"

	pal_func_cpu_u_t f;
	struct proc_dir_entry **pdir;
	struct proc_dir_entry *cpu_dir;
	int j;
	char cpustr[sizeof(CPUSTR)];


	/*
	 * we keep track of created entries in a depth-first order for
	 * cleanup purposes. Each entry is stored into palinfo_proc_entries
	 */
	sprintf(cpustr,CPUSTR, cpu);

	cpu_dir = proc_mkdir(cpustr, palinfo_dir);

	f.req_cpu = cpu;

	/*
	 * Compute the location to store per cpu entries
	 * We dont store the top level entry in this list, but
	 * remove it finally after removing all cpu entries.
	 */
	pdir = &palinfo_proc_entries[cpu*(NR_PALINFO_ENTRIES+1)];
	*pdir++ = cpu_dir;
	for (j=0; j < NR_PALINFO_ENTRIES; j++) {
		f.func_id = j;
		*pdir = create_proc_read_entry(
				palinfo_entries[j].name, 0, cpu_dir,
				palinfo_read_entry, (void *)f.value);
		if (*pdir)
			(*pdir)->owner = THIS_MODULE;
		pdir++;
	}
}

static void
remove_palinfo_proc_entries(unsigned int hcpu)
{
	int j;
	struct proc_dir_entry *cpu_dir, **pdir;

	pdir = &palinfo_proc_entries[hcpu*(NR_PALINFO_ENTRIES+1)];
	cpu_dir = *pdir;
	*pdir++=NULL;
	for (j=0; j < (NR_PALINFO_ENTRIES); j++) {
		if ((*pdir)) {
			remove_proc_entry ((*pdir)->name, cpu_dir);
			*pdir ++= NULL;
		}
	}

	if (cpu_dir) {
		remove_proc_entry(cpu_dir->name, palinfo_dir);
	}
}

static int __cpuinit palinfo_cpu_callback(struct notifier_block *nfb,
					unsigned long action, void *hcpu)
{
	unsigned int hotcpu = (unsigned long)hcpu;

	switch (action) {
	case CPU_ONLINE:
	case CPU_ONLINE_FROZEN:
		create_palinfo_proc_entries(hotcpu);
		break;
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		remove_palinfo_proc_entries(hotcpu);
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block __refdata palinfo_cpu_notifier =
{
	.notifier_call = palinfo_cpu_callback,
	.priority = 0,
};

static int __init
palinfo_init(void)
{
	int i = 0;

	printk(KERN_INFO "PAL Information Facility v%s\n", PALINFO_VERSION);
	palinfo_dir = proc_mkdir("pal", NULL);

	/* Create palinfo dirs in /proc for all online cpus */
	for_each_online_cpu(i) {
		create_palinfo_proc_entries(i);
	}

	/* Register for future delivery via notify registration */
	register_hotcpu_notifier(&palinfo_cpu_notifier);

	return 0;
}

static void __exit
palinfo_exit(void)
{
	int i = 0;

	/* remove all nodes: depth first pass. Could optimize this  */
	for_each_online_cpu(i) {
		remove_palinfo_proc_entries(i);
	}

	/*
	 * Remove the top level entry finally
	 */
	remove_proc_entry(palinfo_dir->name, NULL);

	/*
	 * Unregister from cpu notifier callbacks
	 */
	unregister_hotcpu_notifier(&palinfo_cpu_notifier);
}

module_init(palinfo_init);
module_exit(palinfo_exit);