aboutsummaryrefslogtreecommitdiff
path: root/arch/ia64/sn/kernel/sn2/sn_hwperf.c
blob: 4c7e747909583b5de652d5b3b73507a3ed6a644c (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
/* 
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
 *
 * SGI Altix topology and hardware performance monitoring API.
 * Mark Goodwin <markgw@sgi.com>. 
 *
 * Creates /proc/sgi_sn/sn_topology (read-only) to export
 * info about Altix nodes, routers, CPUs and NumaLink
 * interconnection/topology.
 *
 * Also creates a dynamic misc device named "sn_hwperf"
 * that supports an ioctl interface to call down into SAL
 * to discover hw objects, topology and to read/write
 * memory mapped registers, e.g. for performance monitoring.
 * The "sn_hwperf" device is registered only after the procfs
 * file is first opened, i.e. only if/when it's needed. 
 *
 * This API is used by SGI Performance Co-Pilot and other
 * tools, see http://oss.sgi.com/projects/pcp
 */

#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/seq_file.h>
#include <linux/miscdevice.h>
#include <linux/utsname.h>
#include <linux/cpumask.h>
#include <linux/smp_lock.h>
#include <linux/nodemask.h>
#include <linux/smp.h>
#include <linux/mutex.h>

#include <asm/processor.h>
#include <asm/topology.h>
#include <asm/uaccess.h>
#include <asm/sal.h>
#include <asm/sn/io.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/module.h>
#include <asm/sn/geo.h>
#include <asm/sn/sn2/sn_hwperf.h>
#include <asm/sn/addrs.h>

static void *sn_hwperf_salheap = NULL;
static int sn_hwperf_obj_cnt = 0;
static nasid_t sn_hwperf_master_nasid = INVALID_NASID;
static int sn_hwperf_init(void);
static DEFINE_MUTEX(sn_hwperf_init_mutex);

#define cnode_possible(n)	((n) < num_cnodes)

static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret)
{
	int e;
	u64 sz;
	struct sn_hwperf_object_info *objbuf = NULL;

	if ((e = sn_hwperf_init()) < 0) {
		printk(KERN_ERR "sn_hwperf_init failed: err %d\n", e);
		goto out;
	}

	sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info);
	objbuf = vmalloc(sz);
	if (objbuf == NULL) {
		printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz);
		e = -ENOMEM;
		goto out;
	}

	e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS,
		0, sz, (u64) objbuf, 0, 0, NULL);
	if (e != SN_HWPERF_OP_OK) {
		e = -EINVAL;
		vfree(objbuf);
	}

out:
	*nobj = sn_hwperf_obj_cnt;
	*ret = objbuf;
	return e;
}

static int sn_hwperf_location_to_bpos(char *location,
	int *rack, int *bay, int *slot, int *slab)
{
	char type;

	/* first scan for an old style geoid string */
	if (sscanf(location, "%03d%c%02d#%d",
		rack, &type, bay, slab) == 4)
		*slot = 0; 
	else /* scan for a new bladed geoid string */
	if (sscanf(location, "%03d%c%02d^%02d#%d",
		rack, &type, bay, slot, slab) != 5)
		return -1; 
	/* success */
	return 0;
}

static int sn_hwperf_geoid_to_cnode(char *location)
{
	int cnode;
	geoid_t geoid;
	moduleid_t module_id;
	int rack, bay, slot, slab;
	int this_rack, this_bay, this_slot, this_slab;

	if (sn_hwperf_location_to_bpos(location, &rack, &bay, &slot, &slab))
		return -1;

	/*
	 * FIXME: replace with cleaner for_each_XXX macro which addresses
	 * both compute and IO nodes once ACPI3.0 is available.
	 */
	for (cnode = 0; cnode < num_cnodes; cnode++) {
		geoid = cnodeid_get_geoid(cnode);
		module_id = geo_module(geoid);
		this_rack = MODULE_GET_RACK(module_id);
		this_bay = MODULE_GET_BPOS(module_id);
		this_slot = geo_slot(geoid);
		this_slab = geo_slab(geoid);
		if (rack == this_rack && bay == this_bay &&
			slot == this_slot && slab == this_slab) {
			break;
		}
	}

	return cnode_possible(cnode) ? cnode : -1;
}

static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj)
{
	if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj))
		BUG();
	if (SN_HWPERF_FOREIGN(obj))
		return -1;
	return sn_hwperf_geoid_to_cnode(obj->location);
}

static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj,
				struct sn_hwperf_object_info *objs)
{
	int ordinal;
	struct sn_hwperf_object_info *p;

	for (ordinal=0, p=objs; p != obj; p++) {
		if (SN_HWPERF_FOREIGN(p))
			continue;
		if (SN_HWPERF_SAME_OBJTYPE(p, obj))
			ordinal++;
	}

	return ordinal;
}

static const char *slabname_node =	"node"; /* SHub asic */
static const char *slabname_ionode =	"ionode"; /* TIO asic */
static const char *slabname_router =	"router"; /* NL3R or NL4R */
static const char *slabname_other =	"other"; /* unknown asic */

static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj,
			struct sn_hwperf_object_info *objs, int *ordinal)
{
	int isnode;
	const char *slabname = slabname_other;

	if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) {
	    	slabname = isnode ? slabname_node : slabname_ionode;
		*ordinal = sn_hwperf_obj_to_cnode(obj);
	}
	else {
		*ordinal = sn_hwperf_generic_ordinal(obj, objs);
		if (SN_HWPERF_IS_ROUTER(obj))
			slabname = slabname_router;
	}

	return slabname;
}

static void print_pci_topology(struct seq_file *s)
{
	char *p;
	size_t sz;
	int e;

	for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) {
		if (!(p = kmalloc(sz, GFP_KERNEL)))
			break;
		e = ia64_sn_ioif_get_pci_topology(__pa(p), sz);
		if (e == SALRET_OK)
			seq_puts(s, p);
		kfree(p);
		if (e == SALRET_OK || e == SALRET_NOT_IMPLEMENTED)
			break;
	}
}

static inline int sn_hwperf_has_cpus(cnodeid_t node)
{
	return node < MAX_NUMNODES && node_online(node) && nr_cpus_node(node);
}

static inline int sn_hwperf_has_mem(cnodeid_t node)
{
	return node < MAX_NUMNODES && node_online(node) && NODE_DATA(node)->node_present_pages;
}

static struct sn_hwperf_object_info *
sn_hwperf_findobj_id(struct sn_hwperf_object_info *objbuf,
	int nobj, int id)
{
	int i;
	struct sn_hwperf_object_info *p = objbuf;

	for (i=0; i < nobj; i++, p++) {
		if (p->id == id)
			return p;
	}

	return NULL;

}

static int sn_hwperf_get_nearest_node_objdata(struct sn_hwperf_object_info *objbuf,
	int nobj, cnodeid_t node, cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
{
	int e;
	struct sn_hwperf_object_info *nodeobj = NULL;
	struct sn_hwperf_object_info *op;
	struct sn_hwperf_object_info *dest;
	struct sn_hwperf_object_info *router;
	struct sn_hwperf_port_info ptdata[16];
	int sz, i, j;
	cnodeid_t c;
	int found_mem = 0;
	int found_cpu = 0;

	if (!cnode_possible(node))
		return -EINVAL;

	if (sn_hwperf_has_cpus(node)) {
		if (near_cpu_node)
			*near_cpu_node = node;
		found_cpu++;
	}

	if (sn_hwperf_has_mem(node)) {
		if (near_mem_node)
			*near_mem_node = node;
		found_mem++;
	}

	if (found_cpu && found_mem)
		return 0; /* trivially successful */

	/* find the argument node object */
	for (i=0, op=objbuf; i < nobj; i++, op++) {
		if (!SN_HWPERF_IS_NODE(op) && !SN_HWPERF_IS_IONODE(op))
			continue;
		if (node == sn_hwperf_obj_to_cnode(op)) {
			nodeobj = op;
			break;
		}
	}
	if (!nodeobj) {
		e = -ENOENT;
		goto err;
	}

	/* get it's interconnect topology */
	sz = op->ports * sizeof(struct sn_hwperf_port_info);
	BUG_ON(sz > sizeof(ptdata));
	e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
			      SN_HWPERF_ENUM_PORTS, nodeobj->id, sz,
			      (u64)&ptdata, 0, 0, NULL);
	if (e != SN_HWPERF_OP_OK) {
		e = -EINVAL;
		goto err;
	}

	/* find nearest node with cpus and nearest memory */
	for (router=NULL, j=0; j < op->ports; j++) {
		dest = sn_hwperf_findobj_id(objbuf, nobj, ptdata[j].conn_id);
		if (dest && SN_HWPERF_IS_ROUTER(dest))
			router = dest;
		if (!dest || SN_HWPERF_FOREIGN(dest) ||
		    !SN_HWPERF_IS_NODE(dest) || SN_HWPERF_IS_IONODE(dest)) {
			continue;
		}
		c = sn_hwperf_obj_to_cnode(dest);
		if (!found_cpu && sn_hwperf_has_cpus(c)) {
			if (near_cpu_node)
				*near_cpu_node = c;
			found_cpu++;
		}
		if (!found_mem && sn_hwperf_has_mem(c)) {
			if (near_mem_node)
				*near_mem_node = c;
			found_mem++;
		}
	}

	if (router && (!found_cpu || !found_mem)) {
		/* search for a node connected to the same router */
		sz = router->ports * sizeof(struct sn_hwperf_port_info);
		BUG_ON(sz > sizeof(ptdata));
		e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
				      SN_HWPERF_ENUM_PORTS, router->id, sz,
				      (u64)&ptdata, 0, 0, NULL);
		if (e != SN_HWPERF_OP_OK) {
			e = -EINVAL;
			goto err;
		}
		for (j=0; j < router->ports; j++) {
			dest = sn_hwperf_findobj_id(objbuf, nobj,
				ptdata[j].conn_id);
			if (!dest || dest->id == node ||
			    SN_HWPERF_FOREIGN(dest) ||
			    !SN_HWPERF_IS_NODE(dest) ||
			    SN_HWPERF_IS_IONODE(dest)) {
				continue;
			}
			c = sn_hwperf_obj_to_cnode(dest);
			if (!found_cpu && sn_hwperf_has_cpus(c)) {
				if (near_cpu_node)
					*near_cpu_node = c;
				found_cpu++;
			}
			if (!found_mem && sn_hwperf_has_mem(c)) {
				if (near_mem_node)
					*near_mem_node = c;
				found_mem++;
			}
			if (found_cpu && found_mem)
				break;
		}
	}

	if (!found_cpu || !found_mem) {
		/* resort to _any_ node with CPUs and memory */
		for (i=0, op=objbuf; i < nobj; i++, op++) {
			if (SN_HWPERF_FOREIGN(op) ||
			    SN_HWPERF_IS_IONODE(op) ||
			    !SN_HWPERF_IS_NODE(op)) {
				continue;
			}
			c = sn_hwperf_obj_to_cnode(op);
			if (!found_cpu && sn_hwperf_has_cpus(c)) {
				if (near_cpu_node)
					*near_cpu_node = c;
				found_cpu++;
			}
			if (!found_mem && sn_hwperf_has_mem(c)) {
				if (near_mem_node)
					*near_mem_node = c;
				found_mem++;
			}
			if (found_cpu && found_mem)
				break;
		}
	}

	if (!found_cpu || !found_mem)
		e = -ENODATA;

err:
	return e;
}


static int sn_topology_show(struct seq_file *s, void *d)
{
	int sz;
	int pt;
	int e = 0;
	int i;
	int j;
	const char *slabname;
	int ordinal;
	char slice;
	struct cpuinfo_ia64 *c;
	struct sn_hwperf_port_info *ptdata;
	struct sn_hwperf_object_info *p;
	struct sn_hwperf_object_info *obj = d;	/* this object */
	struct sn_hwperf_object_info *objs = s->private; /* all objects */
	u8 shubtype;
	u8 system_size;
	u8 sharing_size;
	u8 partid;
	u8 coher;
	u8 nasid_shift;
	u8 region_size;
	u16 nasid_mask;
	int nasid_msb;

	if (obj == objs) {
		seq_printf(s, "# sn_topology version 2\n");
		seq_printf(s, "# objtype ordinal location partition"
			" [attribute value [, ...]]\n");

		if (ia64_sn_get_sn_info(0,
			&shubtype, &nasid_mask, &nasid_shift, &system_size,
			&sharing_size, &partid, &coher, &region_size))
			BUG();
		for (nasid_msb=63; nasid_msb > 0; nasid_msb--) {
			if (((u64)nasid_mask << nasid_shift) & (1ULL << nasid_msb))
				break;
		}
		seq_printf(s, "partition %u %s local "
			"shubtype %s, "
			"nasid_mask 0x%016llx, "
			"nasid_bits %d:%d, "
			"system_size %d, "
			"sharing_size %d, "
			"coherency_domain %d, "
			"region_size %d\n",

			partid, utsname()->nodename,
			shubtype ? "shub2" : "shub1", 
			(u64)nasid_mask << nasid_shift, nasid_msb, nasid_shift,
			system_size, sharing_size, coher, region_size);

		print_pci_topology(s);
	}

	if (SN_HWPERF_FOREIGN(obj)) {
		/* private in another partition: not interesting */
		return 0;
	}

	for (i = 0; i < SN_HWPERF_MAXSTRING && obj->name[i]; i++) {
		if (obj->name[i] == ' ')
			obj->name[i] = '_';
	}

	slabname = sn_hwperf_get_slabname(obj, objs, &ordinal);
	seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location,
		obj->sn_hwp_this_part ? "local" : "shared", obj->name);

	if (ordinal < 0 || (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)))
		seq_putc(s, '\n');
	else {
		cnodeid_t near_mem = -1;
		cnodeid_t near_cpu = -1;

		seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal));

		if (sn_hwperf_get_nearest_node_objdata(objs, sn_hwperf_obj_cnt,
			ordinal, &near_mem, &near_cpu) == 0) {
			seq_printf(s, ", near_mem_nodeid %d, near_cpu_nodeid %d",
				near_mem, near_cpu);
		}

		if (!SN_HWPERF_IS_IONODE(obj)) {
			for_each_online_node(i) {
				seq_printf(s, i ? ":%d" : ", dist %d",
					node_distance(ordinal, i));
			}
		}

		seq_putc(s, '\n');

		/*
		 * CPUs on this node, if any
		 */
		if (!SN_HWPERF_IS_IONODE(obj)) {
			for_each_cpu_and(i, cpu_online_mask,
					 cpumask_of_node(ordinal)) {
				slice = 'a' + cpuid_to_slice(i);
				c = cpu_data(i);
				seq_printf(s, "cpu %d %s%c local"
					   " freq %luMHz, arch ia64",
					   i, obj->location, slice,
					   c->proc_freq / 1000000);
				for_each_online_cpu(j) {
					seq_printf(s, j ? ":%d" : ", dist %d",
						   node_distance(
						    	cpu_to_node(i),
						    	cpu_to_node(j)));
				}
				seq_putc(s, '\n');
			}
		}
	}

	if (obj->ports) {
		/*
		 * numalink ports
		 */
		sz = obj->ports * sizeof(struct sn_hwperf_port_info);
		if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
			return -ENOMEM;
		e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
				      SN_HWPERF_ENUM_PORTS, obj->id, sz,
				      (u64) ptdata, 0, 0, NULL);
		if (e != SN_HWPERF_OP_OK)
			return -EINVAL;
		for (ordinal=0, p=objs; p != obj; p++) {
			if (!SN_HWPERF_FOREIGN(p))
				ordinal += p->ports;
		}
		for (pt = 0; pt < obj->ports; pt++) {
			for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) {
				if (ptdata[pt].conn_id == p->id) {
					break;
				}
			}
			seq_printf(s, "numalink %d %s-%d",
			    ordinal+pt, obj->location, ptdata[pt].port);

			if (i >= sn_hwperf_obj_cnt) {
				/* no connection */
				seq_puts(s, " local endpoint disconnected"
					    ", protocol unknown\n");
				continue;
			}

			if (obj->sn_hwp_this_part && p->sn_hwp_this_part)
				/* both ends local to this partition */
				seq_puts(s, " local");
			else if (SN_HWPERF_FOREIGN(p))
				/* both ends of the link in foreign partiton */
				seq_puts(s, " foreign");
			else
				/* link straddles a partition */
				seq_puts(s, " shared");

			/*
			 * Unlikely, but strictly should query the LLP config
			 * registers because an NL4R can be configured to run
			 * NL3 protocol, even when not talking to an NL3 router.
			 * Ditto for node-node.
			 */
			seq_printf(s, " endpoint %s-%d, protocol %s\n",
				p->location, ptdata[pt].conn_port,
				(SN_HWPERF_IS_NL3ROUTER(obj) ||
				SN_HWPERF_IS_NL3ROUTER(p)) ?  "LLP3" : "LLP4");
		}
		kfree(ptdata);
	}

	return 0;
}

static void *sn_topology_start(struct seq_file *s, loff_t * pos)
{
	struct sn_hwperf_object_info *objs = s->private;

	if (*pos < sn_hwperf_obj_cnt)
		return (void *)(objs + *pos);

	return NULL;
}

static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos)
{
	++*pos;
	return sn_topology_start(s, pos);
}

static void sn_topology_stop(struct seq_file *m, void *v)
{
	return;
}

/*
 * /proc/sgi_sn/sn_topology, read-only using seq_file
 */
static const struct seq_operations sn_topology_seq_ops = {
	.start = sn_topology_start,
	.next = sn_topology_next,
	.stop = sn_topology_stop,
	.show = sn_topology_show
};

struct sn_hwperf_op_info {
	u64 op;
	struct sn_hwperf_ioctl_args *a;
	void *p;
	int *v0;
	int ret;
};

static void sn_hwperf_call_sal(void *info)
{
	struct sn_hwperf_op_info *op_info = info;
	int r;

	r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op,
		      op_info->a->arg, op_info->a->sz,
		      (u64) op_info->p, 0, 0, op_info->v0);
	op_info->ret = r;
}

static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
{
	u32 cpu;
	u32 use_ipi;
	int r = 0;
	cpumask_t save_allowed;
	
	cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
	use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
	op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK;

	if (cpu != SN_HWPERF_ARG_ANY_CPU) {
		if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
			r = -EINVAL;
			goto out;
		}
	}

	if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) {
		/* don't care, or already on correct cpu */
		sn_hwperf_call_sal(op_info);
	}
	else {
		if (use_ipi) {
			/* use an interprocessor interrupt to call SAL */
			smp_call_function_single(cpu, sn_hwperf_call_sal,
				op_info, 1);
		}
		else {
			/* migrate the task before calling SAL */ 
			save_allowed = current->cpus_allowed;
			set_cpus_allowed(current, cpumask_of_cpu(cpu));
			sn_hwperf_call_sal(op_info);
			set_cpus_allowed(current, save_allowed);
		}
	}
	r = op_info->ret;

out:
	return r;
}

/* map SAL hwperf error code to system error code */
static int sn_hwperf_map_err(int hwperf_err)
{
	int e;

	switch(hwperf_err) {
	case SN_HWPERF_OP_OK:
		e = 0;
		break;

	case SN_HWPERF_OP_NOMEM:
		e = -ENOMEM;
		break;

	case SN_HWPERF_OP_NO_PERM:
		e = -EPERM;
		break;

	case SN_HWPERF_OP_IO_ERROR:
		e = -EIO;
		break;

	case SN_HWPERF_OP_BUSY:
		e = -EBUSY;
		break;

	case SN_HWPERF_OP_RECONFIGURE:
		e = -EAGAIN;
		break;

	case SN_HWPERF_OP_INVAL:
	default:
		e = -EINVAL;
		break;
	}

	return e;
}

/*
 * ioctl for "sn_hwperf" misc device
 */
static int
sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, unsigned long arg)
{
	struct sn_hwperf_ioctl_args a;
	struct cpuinfo_ia64 *cdata;
	struct sn_hwperf_object_info *objs;
	struct sn_hwperf_object_info *cpuobj;
	struct sn_hwperf_op_info op_info;
	void *p = NULL;
	int nobj;
	char slice;
	int node;
	int r;
	int v0;
	int i;
	int j;

	unlock_kernel();

	/* only user requests are allowed here */
	if ((op & SN_HWPERF_OP_MASK) < 10) {
		r = -EINVAL;
		goto error;
	}
	r = copy_from_user(&a, (const void __user *)arg,
		sizeof(struct sn_hwperf_ioctl_args));
	if (r != 0) {
		r = -EFAULT;
		goto error;
	}

	/*
	 * Allocate memory to hold a kernel copy of the user buffer. The
	 * buffer contents are either copied in or out (or both) of user
	 * space depending on the flags encoded in the requested operation.
	 */
	if (a.ptr) {
		p = vmalloc(a.sz);
		if (!p) {
			r = -ENOMEM;
			goto error;
		}
	}

	if (op & SN_HWPERF_OP_MEM_COPYIN) {
		r = copy_from_user(p, (const void __user *)a.ptr, a.sz);
		if (r != 0) {
			r = -EFAULT;
			goto error;
		}
	}

	switch (op) {
	case SN_HWPERF_GET_CPU_INFO:
		if (a.sz == sizeof(u64)) {
			/* special case to get size needed */
			*(u64 *) p = (u64) num_online_cpus() *
				sizeof(struct sn_hwperf_object_info);
		} else
		if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) {
			r = -ENOMEM;
			goto error;
		} else
		if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
			int cpuobj_index = 0;

			memset(p, 0, a.sz);
			for (i = 0; i < nobj; i++) {
				if (!SN_HWPERF_IS_NODE(objs + i))
					continue;
				node = sn_hwperf_obj_to_cnode(objs + i);
				for_each_online_cpu(j) {
					if (node != cpu_to_node(j))
						continue;
					cpuobj = (struct sn_hwperf_object_info *) p + cpuobj_index++;
					slice = 'a' + cpuid_to_slice(j);
					cdata = cpu_data(j);
					cpuobj->id = j;
					snprintf(cpuobj->name,
						 sizeof(cpuobj->name),
						 "CPU %luMHz %s",
						 cdata->proc_freq / 1000000,
						 cdata->vendor);
					snprintf(cpuobj->location,
						 sizeof(cpuobj->location),
						 "%s%c", objs[i].location,
						 slice);
				}
			}

			vfree(objs);
		}
		break;

	case SN_HWPERF_GET_NODE_NASID:
		if (a.sz != sizeof(u64) ||
		   (node = a.arg) < 0 || !cnode_possible(node)) {
			r = -EINVAL;
			goto error;
		}
		*(u64 *)p = (u64)cnodeid_to_nasid(node);
		break;

	case SN_HWPERF_GET_OBJ_NODE:
		if (a.sz != sizeof(u64) || a.arg < 0) {
			r = -EINVAL;
			goto error;
		}
		if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) {
			if (a.arg >= nobj) {
				r = -EINVAL;
				vfree(objs);
				goto error;
			}
			if (objs[(i = a.arg)].id != a.arg) {
				for (i = 0; i < nobj; i++) {
					if (objs[i].id == a.arg)
						break;
				}
			}
			if (i == nobj) {
				r = -EINVAL;
				vfree(objs);
				goto error;
			}

			if (!SN_HWPERF_IS_NODE(objs + i) &&
			    !SN_HWPERF_IS_IONODE(objs + i)) {
			    	r = -ENOENT;
				vfree(objs);
				goto error;
			}

			*(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i);
			vfree(objs);
		}
		break;

	case SN_HWPERF_GET_MMRS:
	case SN_HWPERF_SET_MMRS:
	case SN_HWPERF_OBJECT_DISTANCE:
		op_info.p = p;
		op_info.a = &a;
		op_info.v0 = &v0;
		op_info.op = op;
		r = sn_hwperf_op_cpu(&op_info);
		if (r) {
			r = sn_hwperf_map_err(r);
			a.v0 = v0;
			goto error;
		}
		break;

	default:
		/* all other ops are a direct SAL call */
		r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op,
			      a.arg, a.sz, (u64) p, 0, 0, &v0);
		if (r) {
			r = sn_hwperf_map_err(r);
			goto error;
		}
		a.v0 = v0;
		break;
	}

	if (op & SN_HWPERF_OP_MEM_COPYOUT) {
		r = copy_to_user((void __user *)a.ptr, p, a.sz);
		if (r != 0) {
			r = -EFAULT;
			goto error;
		}
	}

error:
	vfree(p);

	lock_kernel();
	return r;
}

static const struct file_operations sn_hwperf_fops = {
	.ioctl = sn_hwperf_ioctl,
};

static struct miscdevice sn_hwperf_dev = {
	MISC_DYNAMIC_MINOR,
	"sn_hwperf",
	&sn_hwperf_fops
};

static int sn_hwperf_init(void)
{
	u64 v;
	int salr;
	int e = 0;

	/* single threaded, once-only initialization */
	mutex_lock(&sn_hwperf_init_mutex);

	if (sn_hwperf_salheap) {
		mutex_unlock(&sn_hwperf_init_mutex);
		return e;
	}

	/*
	 * The PROM code needs a fixed reference node. For convenience the
	 * same node as the console I/O is used.
	 */
	sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid();

	/*
	 * Request the needed size and install the PROM scratch area.
	 * The PROM keeps various tracking bits in this memory area.
	 */
	salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
				 (u64) SN_HWPERF_GET_HEAPSIZE, 0,
				 (u64) sizeof(u64), (u64) &v, 0, 0, NULL);
	if (salr != SN_HWPERF_OP_OK) {
		e = -EINVAL;
		goto out;
	}

	if ((sn_hwperf_salheap = vmalloc(v)) == NULL) {
		e = -ENOMEM;
		goto out;
	}
	salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
				 SN_HWPERF_INSTALL_HEAP, 0, v,
				 (u64) sn_hwperf_salheap, 0, 0, NULL);
	if (salr != SN_HWPERF_OP_OK) {
		e = -EINVAL;
		goto out;
	}

	salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
				 SN_HWPERF_OBJECT_COUNT, 0,
				 sizeof(u64), (u64) &v, 0, 0, NULL);
	if (salr != SN_HWPERF_OP_OK) {
		e = -EINVAL;
		goto out;
	}
	sn_hwperf_obj_cnt = (int)v;

out:
	if (e < 0 && sn_hwperf_salheap) {
		vfree(sn_hwperf_salheap);
		sn_hwperf_salheap = NULL;
		sn_hwperf_obj_cnt = 0;
	}
	mutex_unlock(&sn_hwperf_init_mutex);
	return e;
}

int sn_topology_open(struct inode *inode, struct file *file)
{
	int e;
	struct seq_file *seq;
	struct sn_hwperf_object_info *objbuf;
	int nobj;

	if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
		e = seq_open(file, &sn_topology_seq_ops);
		seq = file->private_data;
		seq->private = objbuf;
	}

	return e;
}

int sn_topology_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = file->private_data;

	vfree(seq->private);
	return seq_release(inode, file);
}

int sn_hwperf_get_nearest_node(cnodeid_t node,
	cnodeid_t *near_mem_node, cnodeid_t *near_cpu_node)
{
	int e;
	int nobj;
	struct sn_hwperf_object_info *objbuf;

	if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) {
		e = sn_hwperf_get_nearest_node_objdata(objbuf, nobj,
			node, near_mem_node, near_cpu_node);
		vfree(objbuf);
	}

	return e;
}

static int __devinit sn_hwperf_misc_register_init(void)
{
	int e;

	if (!ia64_platform_is("sn2"))
		return 0;

	sn_hwperf_init();

	/*
	 * Register a dynamic misc device for hwperf ioctls. Platforms
	 * supporting hotplug will create /dev/sn_hwperf, else user
	 * can to look up the minor number in /proc/misc.
	 */
	if ((e = misc_register(&sn_hwperf_dev)) != 0) {
		printk(KERN_ERR "sn_hwperf_misc_register_init: failed to "
		"register misc device for \"%s\"\n", sn_hwperf_dev.name);
	}

	return e;
}

device_initcall(sn_hwperf_misc_register_init); /* after misc_init() */
EXPORT_SYMBOL(sn_hwperf_get_nearest_node);