Free Electrons

Embedded Linux Experts

  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
/* mdesc.c: Sun4V machine description handling.
 *
 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
 */
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/memblock.h>
#include <linux/log2.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/bootmem.h>

#include <asm/cpudata.h>
#include <asm/hypervisor.h>
#include <asm/mdesc.h>
#include <asm/prom.h>
#include <asm/oplib.h>
#include <asm/smp.h>

/* Unlike the OBP device tree, the machine description is a full-on
 * DAG.  An arbitrary number of ARCs are possible from one
 * node to other nodes and thus we can't use the OBP device_node
 * data structure to represent these nodes inside of the kernel.
 *
 * Actually, it isn't even a DAG, because there are back pointers
 * which create cycles in the graph.
 *
 * mdesc_hdr and mdesc_elem describe the layout of the data structure
 * we get from the Hypervisor.
 */
struct mdesc_hdr {
	u32	version; /* Transport version */
	u32	node_sz; /* node block size */
	u32	name_sz; /* name block size */
	u32	data_sz; /* data block size */
} __attribute__((aligned(16)));

struct mdesc_elem {
	u8	tag;
#define MD_LIST_END	0x00
#define MD_NODE		0x4e
#define MD_NODE_END	0x45
#define MD_NOOP		0x20
#define MD_PROP_ARC	0x61
#define MD_PROP_VAL	0x76
#define MD_PROP_STR	0x73
#define MD_PROP_DATA	0x64
	u8	name_len;
	u16	resv;
	u32	name_offset;
	union {
		struct {
			u32	data_len;
			u32	data_offset;
		} data;
		u64	val;
	} d;
};

struct mdesc_mem_ops {
	struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
	void (*free)(struct mdesc_handle *handle);
};

struct mdesc_handle {
	struct list_head	list;
	struct mdesc_mem_ops	*mops;
	void			*self_base;
	atomic_t		refcnt;
	unsigned int		handle_size;
	struct mdesc_hdr	mdesc;
};

static void mdesc_handle_init(struct mdesc_handle *hp,
			      unsigned int handle_size,
			      void *base)
{
	BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));

	memset(hp, 0, handle_size);
	INIT_LIST_HEAD(&hp->list);
	hp->self_base = base;
	atomic_set(&hp->refcnt, 1);
	hp->handle_size = handle_size;
}

static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
{
	unsigned int handle_size, alloc_size;
	struct mdesc_handle *hp;
	unsigned long paddr;

	handle_size = (sizeof(struct mdesc_handle) -
		       sizeof(struct mdesc_hdr) +
		       mdesc_size);
	alloc_size = PAGE_ALIGN(handle_size);

	paddr = memblock_alloc(alloc_size, PAGE_SIZE);

	hp = NULL;
	if (paddr) {
		hp = __va(paddr);
		mdesc_handle_init(hp, handle_size, hp);
	}
	return hp;
}

static void mdesc_memblock_free(struct mdesc_handle *hp)
{
	unsigned int alloc_size;
	unsigned long start;

	BUG_ON(atomic_read(&hp->refcnt) != 0);
	BUG_ON(!list_empty(&hp->list));

	alloc_size = PAGE_ALIGN(hp->handle_size);
	start = __pa(hp);
	free_bootmem_late(start, alloc_size);
}

static struct mdesc_mem_ops memblock_mdesc_ops = {
	.alloc = mdesc_memblock_alloc,
	.free  = mdesc_memblock_free,
};

static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
{
	unsigned int handle_size;
	void *base;

	handle_size = (sizeof(struct mdesc_handle) -
		       sizeof(struct mdesc_hdr) +
		       mdesc_size);

	base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
	if (base) {
		struct mdesc_handle *hp;
		unsigned long addr;

		addr = (unsigned long)base;
		addr = (addr + 15UL) & ~15UL;
		hp = (struct mdesc_handle *) addr;

		mdesc_handle_init(hp, handle_size, base);
		return hp;
	}

	return NULL;
}

static void mdesc_kfree(struct mdesc_handle *hp)
{
	BUG_ON(atomic_read(&hp->refcnt) != 0);
	BUG_ON(!list_empty(&hp->list));

	kfree(hp->self_base);
}

static struct mdesc_mem_ops kmalloc_mdesc_memops = {
	.alloc = mdesc_kmalloc,
	.free  = mdesc_kfree,
};

static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
					struct mdesc_mem_ops *mops)
{
	struct mdesc_handle *hp = mops->alloc(mdesc_size);

	if (hp)
		hp->mops = mops;

	return hp;
}

static void mdesc_free(struct mdesc_handle *hp)
{
	hp->mops->free(hp);
}

static struct mdesc_handle *cur_mdesc;
static LIST_HEAD(mdesc_zombie_list);
static DEFINE_SPINLOCK(mdesc_lock);

struct mdesc_handle *mdesc_grab(void)
{
	struct mdesc_handle *hp;
	unsigned long flags;

	spin_lock_irqsave(&mdesc_lock, flags);
	hp = cur_mdesc;
	if (hp)
		atomic_inc(&hp->refcnt);
	spin_unlock_irqrestore(&mdesc_lock, flags);

	return hp;
}
EXPORT_SYMBOL(mdesc_grab);

void mdesc_release(struct mdesc_handle *hp)
{
	unsigned long flags;

	spin_lock_irqsave(&mdesc_lock, flags);
	if (atomic_dec_and_test(&hp->refcnt)) {
		list_del_init(&hp->list);
		hp->mops->free(hp);
	}
	spin_unlock_irqrestore(&mdesc_lock, flags);
}
EXPORT_SYMBOL(mdesc_release);

static DEFINE_MUTEX(mdesc_mutex);
static struct mdesc_notifier_client *client_list;

void mdesc_register_notifier(struct mdesc_notifier_client *client)
{
	u64 node;

	mutex_lock(&mdesc_mutex);
	client->next = client_list;
	client_list = client;

	mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
		client->add(cur_mdesc, node);

	mutex_unlock(&mdesc_mutex);
}

static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
{
	const u64 *id;
	u64 a;

	id = NULL;
	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
		u64 target;

		target = mdesc_arc_target(hp, a);
		id = mdesc_get_property(hp, target,
					"cfg-handle", NULL);
		if (id)
			break;
	}

	return id;
}

/* Run 'func' on nodes which are in A but not in B.  */
static void invoke_on_missing(const char *name,
			      struct mdesc_handle *a,
			      struct mdesc_handle *b,
			      void (*func)(struct mdesc_handle *, u64))
{
	u64 node;

	mdesc_for_each_node_by_name(a, node, name) {
		int found = 0, is_vdc_port = 0;
		const char *name_prop;
		const u64 *id;
		u64 fnode;

		name_prop = mdesc_get_property(a, node, "name", NULL);
		if (name_prop && !strcmp(name_prop, "vdc-port")) {
			is_vdc_port = 1;
			id = parent_cfg_handle(a, node);
		} else
			id = mdesc_get_property(a, node, "id", NULL);

		if (!id) {
			printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
			       (name_prop ? name_prop : name));
			continue;
		}

		mdesc_for_each_node_by_name(b, fnode, name) {
			const u64 *fid;

			if (is_vdc_port) {
				name_prop = mdesc_get_property(b, fnode,
							       "name", NULL);
				if (!name_prop ||
				    strcmp(name_prop, "vdc-port"))
					continue;
				fid = parent_cfg_handle(b, fnode);
				if (!fid) {
					printk(KERN_ERR "MD: Cannot find ID "
					       "for vdc-port node.\n");
					continue;
				}
			} else
				fid = mdesc_get_property(b, fnode,
							 "id", NULL);

			if (*id == *fid) {
				found = 1;
				break;
			}
		}
		if (!found)
			func(a, node);
	}
}

static void notify_one(struct mdesc_notifier_client *p,
		       struct mdesc_handle *old_hp,
		       struct mdesc_handle *new_hp)
{
	invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
	invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
}

static void mdesc_notify_clients(struct mdesc_handle *old_hp,
				 struct mdesc_handle *new_hp)
{
	struct mdesc_notifier_client *p = client_list;

	while (p) {
		notify_one(p, old_hp, new_hp);
		p = p->next;
	}
}

void mdesc_update(void)
{
	unsigned long len, real_len, status;
	struct mdesc_handle *hp, *orig_hp;
	unsigned long flags;

	mutex_lock(&mdesc_mutex);

	(void) sun4v_mach_desc(0UL, 0UL, &len);

	hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
	if (!hp) {
		printk(KERN_ERR "MD: mdesc alloc fails\n");
		goto out;
	}

	status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
	if (status != HV_EOK || real_len > len) {
		printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
		       status);
		atomic_dec(&hp->refcnt);
		mdesc_free(hp);
		goto out;
	}

	spin_lock_irqsave(&mdesc_lock, flags);
	orig_hp = cur_mdesc;
	cur_mdesc = hp;
	spin_unlock_irqrestore(&mdesc_lock, flags);

	mdesc_notify_clients(orig_hp, hp);

	spin_lock_irqsave(&mdesc_lock, flags);
	if (atomic_dec_and_test(&orig_hp->refcnt))
		mdesc_free(orig_hp);
	else
		list_add(&orig_hp->list, &mdesc_zombie_list);
	spin_unlock_irqrestore(&mdesc_lock, flags);

out:
	mutex_unlock(&mdesc_mutex);
}

static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
{
	return (struct mdesc_elem *) (mdesc + 1);
}

static void *name_block(struct mdesc_hdr *mdesc)
{
	return ((void *) node_block(mdesc)) + mdesc->node_sz;
}

static void *data_block(struct mdesc_hdr *mdesc)
{
	return ((void *) name_block(mdesc)) + mdesc->name_sz;
}

u64 mdesc_node_by_name(struct mdesc_handle *hp,
		       u64 from_node, const char *name)
{
	struct mdesc_elem *ep = node_block(&hp->mdesc);
	const char *names = name_block(&hp->mdesc);
	u64 last_node = hp->mdesc.node_sz / 16;
	u64 ret;

	if (from_node == MDESC_NODE_NULL) {
		ret = from_node = 0;
	} else if (from_node >= last_node) {
		return MDESC_NODE_NULL;
	} else {
		ret = ep[from_node].d.val;
	}

	while (ret < last_node) {
		if (ep[ret].tag != MD_NODE)
			return MDESC_NODE_NULL;
		if (!strcmp(names + ep[ret].name_offset, name))
			break;
		ret = ep[ret].d.val;
	}
	if (ret >= last_node)
		ret = MDESC_NODE_NULL;
	return ret;
}
EXPORT_SYMBOL(mdesc_node_by_name);

const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
			       const char *name, int *lenp)
{
	const char *names = name_block(&hp->mdesc);
	u64 last_node = hp->mdesc.node_sz / 16;
	void *data = data_block(&hp->mdesc);
	struct mdesc_elem *ep;

	if (node == MDESC_NODE_NULL || node >= last_node)
		return NULL;

	ep = node_block(&hp->mdesc) + node;
	ep++;
	for (; ep->tag != MD_NODE_END; ep++) {
		void *val = NULL;
		int len = 0;

		switch (ep->tag) {
		case MD_PROP_VAL:
			val = &ep->d.val;
			len = 8;
			break;

		case MD_PROP_STR:
		case MD_PROP_DATA:
			val = data + ep->d.data.data_offset;
			len = ep->d.data.data_len;
			break;

		default:
			break;
		}
		if (!val)
			continue;

		if (!strcmp(names + ep->name_offset, name)) {
			if (lenp)
				*lenp = len;
			return val;
		}
	}

	return NULL;
}
EXPORT_SYMBOL(mdesc_get_property);

u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
{
	struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
	const char *names = name_block(&hp->mdesc);
	u64 last_node = hp->mdesc.node_sz / 16;

	if (from == MDESC_NODE_NULL || from >= last_node)
		return MDESC_NODE_NULL;

	ep = base + from;

	ep++;
	for (; ep->tag != MD_NODE_END; ep++) {
		if (ep->tag != MD_PROP_ARC)
			continue;

		if (strcmp(names + ep->name_offset, arc_type))
			continue;

		return ep - base;
	}

	return MDESC_NODE_NULL;
}
EXPORT_SYMBOL(mdesc_next_arc);

u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
{
	struct mdesc_elem *ep, *base = node_block(&hp->mdesc);

	ep = base + arc;

	return ep->d.val;
}
EXPORT_SYMBOL(mdesc_arc_target);

const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
{
	struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
	const char *names = name_block(&hp->mdesc);
	u64 last_node = hp->mdesc.node_sz / 16;

	if (node == MDESC_NODE_NULL || node >= last_node)
		return NULL;

	ep = base + node;
	if (ep->tag != MD_NODE)
		return NULL;

	return names + ep->name_offset;
}
EXPORT_SYMBOL(mdesc_node_name);

static void __init report_platform_properties(void)
{
	struct mdesc_handle *hp = mdesc_grab();
	u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
	const char *s;
	const u64 *v;

	if (pn == MDESC_NODE_NULL) {
		prom_printf("No platform node in machine-description.\n");
		prom_halt();
	}

	s = mdesc_get_property(hp, pn, "banner-name", NULL);
	printk("PLATFORM: banner-name [%s]\n", s);
	s = mdesc_get_property(hp, pn, "name", NULL);
	printk("PLATFORM: name [%s]\n", s);

	v = mdesc_get_property(hp, pn, "hostid", NULL);
	if (v)
		printk("PLATFORM: hostid [%08llx]\n", *v);
	v = mdesc_get_property(hp, pn, "serial#", NULL);
	if (v)
		printk("PLATFORM: serial# [%08llx]\n", *v);
	v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
	printk("PLATFORM: stick-frequency [%08llx]\n", *v);
	v = mdesc_get_property(hp, pn, "mac-address", NULL);
	if (v)
		printk("PLATFORM: mac-address [%llx]\n", *v);
	v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
	if (v)
		printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
	v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
	if (v)
		printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
	v = mdesc_get_property(hp, pn, "max-cpus", NULL);
	if (v)
		printk("PLATFORM: max-cpus [%llu]\n", *v);

#ifdef CONFIG_SMP
	{
		int max_cpu, i;

		if (v) {
			max_cpu = *v;
			if (max_cpu > NR_CPUS)
				max_cpu = NR_CPUS;
		} else {
			max_cpu = NR_CPUS;
		}
		for (i = 0; i < max_cpu; i++)
			set_cpu_possible(i, true);
	}
#endif

	mdesc_release(hp);
}

static void __cpuinit fill_in_one_cache(cpuinfo_sparc *c,
					struct mdesc_handle *hp,
					u64 mp)
{
	const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
	const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
	const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
	const char *type;
	int type_len;

	type = mdesc_get_property(hp, mp, "type", &type_len);

	switch (*level) {
	case 1:
		if (of_find_in_proplist(type, "instn", type_len)) {
			c->icache_size = *size;
			c->icache_line_size = *line_size;
		} else if (of_find_in_proplist(type, "data", type_len)) {
			c->dcache_size = *size;
			c->dcache_line_size = *line_size;
		}
		break;

	case 2:
		c->ecache_size = *size;
		c->ecache_line_size = *line_size;
		break;

	default:
		break;
	}

	if (*level == 1) {
		u64 a;

		mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
			u64 target = mdesc_arc_target(hp, a);
			const char *name = mdesc_node_name(hp, target);

			if (!strcmp(name, "cache"))
				fill_in_one_cache(c, hp, target);
		}
	}
}

static void __cpuinit mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
{
	u64 a;

	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
		u64 t = mdesc_arc_target(hp, a);
		const char *name;
		const u64 *id;

		name = mdesc_node_name(hp, t);
		if (!strcmp(name, "cpu")) {
			id = mdesc_get_property(hp, t, "id", NULL);
			if (*id < NR_CPUS)
				cpu_data(*id).core_id = core_id;
		} else {
			u64 j;

			mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
				u64 n = mdesc_arc_target(hp, j);
				const char *n_name;

				n_name = mdesc_node_name(hp, n);
				if (strcmp(n_name, "cpu"))
					continue;

				id = mdesc_get_property(hp, n, "id", NULL);
				if (*id < NR_CPUS)
					cpu_data(*id).core_id = core_id;
			}
		}
	}
}

static void __cpuinit set_core_ids(struct mdesc_handle *hp)
{
	int idx;
	u64 mp;

	idx = 1;
	mdesc_for_each_node_by_name(hp, mp, "cache") {
		const u64 *level;
		const char *type;
		int len;

		level = mdesc_get_property(hp, mp, "level", NULL);
		if (*level != 1)
			continue;

		type = mdesc_get_property(hp, mp, "type", &len);
		if (!of_find_in_proplist(type, "instn", len))
			continue;

		mark_core_ids(hp, mp, idx);

		idx++;
	}
}

static void __cpuinit mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
{
	u64 a;

	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
		u64 t = mdesc_arc_target(hp, a);
		const char *name;
		const u64 *id;

		name = mdesc_node_name(hp, t);
		if (strcmp(name, "cpu"))
			continue;

		id = mdesc_get_property(hp, t, "id", NULL);
		if (*id < NR_CPUS)
			cpu_data(*id).proc_id = proc_id;
	}
}

static void __cpuinit __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
{
	int idx;
	u64 mp;

	idx = 0;
	mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
		const char *type;
		int len;

		type = mdesc_get_property(hp, mp, "type", &len);
		if (!of_find_in_proplist(type, "int", len) &&
		    !of_find_in_proplist(type, "integer", len))
			continue;

		mark_proc_ids(hp, mp, idx);

		idx++;
	}
}

static void __cpuinit set_proc_ids(struct mdesc_handle *hp)
{
	__set_proc_ids(hp, "exec_unit");
	__set_proc_ids(hp, "exec-unit");
}

static void __cpuinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
					 unsigned char def)
{
	u64 val;

	if (!p)
		goto use_default;
	val = *p;

	if (!val || val >= 64)
		goto use_default;

	*mask = ((1U << val) * 64U) - 1U;
	return;

use_default:
	*mask = ((1U << def) * 64U) - 1U;
}

static void __cpuinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
				     struct trap_per_cpu *tb)
{
	const u64 *val;

	val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
	get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7);

	val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
	get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7);

	val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
	get_one_mondo_bits(val, &tb->resum_qmask, 6);

	val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
	get_one_mondo_bits(val, &tb->nonresum_qmask, 2);
}

static void * __cpuinit mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
{
	struct mdesc_handle *hp = mdesc_grab();
	void *ret = NULL;
	u64 mp;

	mdesc_for_each_node_by_name(hp, mp, "cpu") {
		const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
		int cpuid = *id;

#ifdef CONFIG_SMP
		if (cpuid >= NR_CPUS) {
			printk(KERN_WARNING "Ignoring CPU %d which is "
			       ">= NR_CPUS (%d)\n",
			       cpuid, NR_CPUS);
			continue;
		}
		if (!cpu_isset(cpuid, *mask))
			continue;
#endif

		ret = func(hp, mp, cpuid, arg);
		if (ret)
			goto out;
	}
out:
	mdesc_release(hp);
	return ret;
}

static void * __cpuinit record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
{
	ncpus_probed++;
#ifdef CONFIG_SMP
	set_cpu_present(cpuid, true);
#endif
	return NULL;
}

void __cpuinit mdesc_populate_present_mask(cpumask_t *mask)
{
	if (tlb_type != hypervisor)
		return;

	ncpus_probed = 0;
	mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
}

static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
{
	const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
	struct trap_per_cpu *tb;
	cpuinfo_sparc *c;
	u64 a;

#ifndef CONFIG_SMP
	/* On uniprocessor we only want the values for the
	 * real physical cpu the kernel booted onto, however
	 * cpu_data() only has one entry at index 0.
	 */
	if (cpuid != real_hard_smp_processor_id())
		return NULL;
	cpuid = 0;
#endif

	c = &cpu_data(cpuid);
	c->clock_tick = *cfreq;

	tb = &trap_block[cpuid];
	get_mondo_data(hp, mp, tb);

	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
		u64 j, t = mdesc_arc_target(hp, a);
		const char *t_name;

		t_name = mdesc_node_name(hp, t);
		if (!strcmp(t_name, "cache")) {
			fill_in_one_cache(c, hp, t);
			continue;
		}

		mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
			u64 n = mdesc_arc_target(hp, j);
			const char *n_name;

			n_name = mdesc_node_name(hp, n);
			if (!strcmp(n_name, "cache"))
				fill_in_one_cache(c, hp, n);
		}
	}

	c->core_id = 0;
	c->proc_id = -1;

	return NULL;
}

void __cpuinit mdesc_fill_in_cpu_data(cpumask_t *mask)
{
	struct mdesc_handle *hp;

	mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);

#ifdef CONFIG_SMP
	sparc64_multi_core = 1;
#endif

	hp = mdesc_grab();

	set_core_ids(hp);
	set_proc_ids(hp);

	mdesc_release(hp);

	smp_fill_in_sib_core_maps();
}

static ssize_t mdesc_read(struct file *file, char __user *buf,
			  size_t len, loff_t *offp)
{
	struct mdesc_handle *hp = mdesc_grab();
	int err;

	if (!hp)
		return -ENODEV;

	err = hp->handle_size;
	if (len < hp->handle_size)
		err = -EMSGSIZE;
	else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
		err = -EFAULT;
	mdesc_release(hp);

	return err;
}

static const struct file_operations mdesc_fops = {
	.read	= mdesc_read,
	.owner	= THIS_MODULE,
	.llseek = noop_llseek,
};

static struct miscdevice mdesc_misc = {
	.minor	= MISC_DYNAMIC_MINOR,
	.name	= "mdesc",
	.fops	= &mdesc_fops,
};

static int __init mdesc_misc_init(void)
{
	return misc_register(&mdesc_misc);
}

__initcall(mdesc_misc_init);

void __init sun4v_mdesc_init(void)
{
	struct mdesc_handle *hp;
	unsigned long len, real_len, status;

	(void) sun4v_mach_desc(0UL, 0UL, &len);

	printk("MDESC: Size is %lu bytes.\n", len);

	hp = mdesc_alloc(len, &memblock_mdesc_ops);
	if (hp == NULL) {
		prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
		prom_halt();
	}

	status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
	if (status != HV_EOK || real_len > len) {
		prom_printf("sun4v_mach_desc fails, err(%lu), "
			    "len(%lu), real_len(%lu)\n",
			    status, len, real_len);
		mdesc_free(hp);
		prom_halt();
	}

	cur_mdesc = hp;

	report_platform_properties();
}