aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc64/kernel/mdesc.c
blob: f0e16045fb1693f0f8ba9e8e507413833aa05b9f (plain) (blame)
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
/* mdesc.c: Sun4V machine description handling.
 *
 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
 */
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/bootmem.h>
#include <linux/log2.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 */
};

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;
};

static struct mdesc_hdr *main_mdesc;
static struct mdesc_node *allnodes;

static struct mdesc_node *allnodes_tail;
static unsigned int unique_id;

static struct mdesc_node **mdesc_hash;
static unsigned int mdesc_hash_size;

static inline unsigned int node_hashfn(u64 node)
{
	return ((unsigned int) (node ^ (node >> 8) ^ (node >> 16)))
		& (mdesc_hash_size - 1);
}

static inline void hash_node(struct mdesc_node *mp)
{
	struct mdesc_node **head = &mdesc_hash[node_hashfn(mp->node)];

	mp->hash_next = *head;
	*head = mp;

	if (allnodes_tail) {
		allnodes_tail->allnodes_next = mp;
		allnodes_tail = mp;
	} else {
		allnodes = allnodes_tail = mp;
	}
}

static struct mdesc_node *find_node(u64 node)
{
	struct mdesc_node *mp = mdesc_hash[node_hashfn(node)];

	while (mp) {
		if (mp->node == node)
			return mp;

		mp = mp->hash_next;
	}
	return NULL;
}

struct property *md_find_property(const struct mdesc_node *mp,
				  const char *name,
				  int *lenp)
{
	struct property *pp;

	for (pp = mp->properties; pp != 0; pp = pp->next) {
		if (strcasecmp(pp->name, name) == 0) {
			if (lenp)
				*lenp = pp->length;
			break;
		}
	}
	return pp;
}
EXPORT_SYMBOL(md_find_property);

/*
 * Find a property with a given name for a given node
 * and return the value.
 */
const void *md_get_property(const struct mdesc_node *mp, const char *name,
			    int *lenp)
{
	struct property *pp = md_find_property(mp, name, lenp);
	return pp ? pp->value : NULL;
}
EXPORT_SYMBOL(md_get_property);

struct mdesc_node *md_find_node_by_name(struct mdesc_node *from,
					const char *name)
{
	struct mdesc_node *mp;

	mp = from ? from->allnodes_next : allnodes;
	for (; mp != NULL; mp = mp->allnodes_next) {
		if (strcmp(mp->name, name) == 0)
			break;
	}
	return mp;
}
EXPORT_SYMBOL(md_find_node_by_name);

static unsigned int mdesc_early_allocated;

static void * __init mdesc_early_alloc(unsigned long size)
{
	void *ret;

	ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
	if (ret == NULL) {
		prom_printf("MDESC: alloc of %lu bytes failed.\n", size);
		prom_halt();
	}

	memset(ret, 0, size);

	mdesc_early_allocated += size;

	return ret;
}

static unsigned int __init count_arcs(struct mdesc_elem *ep)
{
	unsigned int ret = 0;

	ep++;
	while (ep->tag != MD_NODE_END) {
		if (ep->tag == MD_PROP_ARC)
			ret++;
		ep++;
	}
	return ret;
}

static void __init mdesc_node_alloc(u64 node, struct mdesc_elem *ep, const char *names)
{
	unsigned int num_arcs = count_arcs(ep);
	struct mdesc_node *mp;

	mp = mdesc_early_alloc(sizeof(*mp) +
			       (num_arcs * sizeof(struct mdesc_arc)));
	mp->name = names + ep->name_offset;
	mp->node = node;
	mp->unique_id = unique_id++;
	mp->num_arcs = num_arcs;

	hash_node(mp);
}

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

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

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

/* In order to avoid recursion (the graph can be very deep) we use a
 * two pass algorithm.  First we allocate all the nodes and hash them.
 * Then we iterate over each node, filling in the arcs and properties.
 */
static void __init build_all_nodes(struct mdesc_hdr *mdesc)
{
	struct mdesc_elem *start, *ep;
	struct mdesc_node *mp;
	const char *names;
	void *data;
	u64 last_node;

	start = ep = node_block(mdesc);
	last_node = mdesc->node_sz / 16;

	names = name_block(mdesc);

	while (1) {
		u64 node = ep - start;

		if (ep->tag == MD_LIST_END)
			break;

		if (ep->tag != MD_NODE) {
			prom_printf("MDESC: Inconsistent element list.\n");
			prom_halt();
		}

		mdesc_node_alloc(node, ep, names);

		if (ep->d.val >= last_node) {
			printk("MDESC: Warning, early break out of node scan.\n");
			printk("MDESC: Next node [%lu] last_node [%lu].\n",
			       node, last_node);
			break;
		}

		ep = start + ep->d.val;
	}

	data = data_block(mdesc);
	for (mp = allnodes; mp; mp = mp->allnodes_next) {
		struct mdesc_elem *ep = start + mp->node;
		struct property **link = &mp->properties;
		unsigned int this_arc = 0;

		ep++;
		while (ep->tag != MD_NODE_END) {
			switch (ep->tag) {
			case MD_PROP_ARC: {
				struct mdesc_node *target;

				if (this_arc >= mp->num_arcs) {
					prom_printf("MDESC: ARC overrun [%u:%u]\n",
						    this_arc, mp->num_arcs);
					prom_halt();
				}
				target = find_node(ep->d.val);
				if (!target) {
					printk("MDESC: Warning, arc points to "
					       "missing node, ignoring.\n");
					break;
				}
				mp->arcs[this_arc].name =
					(names + ep->name_offset);
				mp->arcs[this_arc].arc = target;
				this_arc++;
				break;
			}

			case MD_PROP_VAL:
			case MD_PROP_STR:
			case MD_PROP_DATA: {
				struct property *p = mdesc_early_alloc(sizeof(*p));

				p->unique_id = unique_id++;
				p->name = (char *) names + ep->name_offset;
				if (ep->tag == MD_PROP_VAL) {
					p->value = &ep->d.val;
					p->length = 8;
				} else {
					p->value = data + ep->d.data.data_offset;
					p->length = ep->d.data.data_len;
				}
				*link = p;
				link = &p->next;
				break;
			}

			case MD_NOOP:
				break;

			default:
				printk("MDESC: Warning, ignoring unknown tag type %02x\n",
				       ep->tag);
			}
			ep++;
		}
	}
}

static unsigned int __init count_nodes(struct mdesc_hdr *mdesc)
{
	struct mdesc_elem *ep = node_block(mdesc);
	struct mdesc_elem *end;
	unsigned int cnt = 0;

	end = ((void *)ep) + mdesc->node_sz;
	while (ep < end) {
		if (ep->tag == MD_NODE)
			cnt++;
		ep++;
	}
	return cnt;
}

static void __init report_platform_properties(void)
{
	struct mdesc_node *pn = md_find_node_by_name(NULL, "platform");
	const char *s;
	const u64 *v;

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

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

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

static int inline find_in_proplist(const char *list, const char *match, int len)
{
	while (len > 0) {
		int l;

		if (!strcmp(list, match))
			return 1;
		l = strlen(list) + 1;
		list += l;
		len -= l;
	}
	return 0;
}

static void __init fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_node *mp)
{
	const u64 *level = md_get_property(mp, "level", NULL);
	const u64 *size = md_get_property(mp, "size", NULL);
	const u64 *line_size = md_get_property(mp, "line-size", NULL);
	const char *type;
	int type_len;

	type = md_get_property(mp, "type", &type_len);

	switch (*level) {
	case 1:
		if (find_in_proplist(type, "instn", type_len)) {
			c->icache_size = *size;
			c->icache_line_size = *line_size;
		} else if (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) {
		unsigned int i;

		for (i = 0; i < mp->num_arcs; i++) {
			struct mdesc_node *t = mp->arcs[i].arc;

			if (strcmp(mp->arcs[i].name, "fwd"))
				continue;

			if (!strcmp(t->name, "cache"))
				fill_in_one_cache(c, t);
		}
	}
}

static void __init mark_core_ids(struct mdesc_node *mp, int core_id)
{
	unsigned int i;

	for (i = 0; i < mp->num_arcs; i++) {
		struct mdesc_node *t = mp->arcs[i].arc;
		const u64 *id;

		if (strcmp(mp->arcs[i].name, "back"))
			continue;

		if (!strcmp(t->name, "cpu")) {
			id = md_get_property(t, "id", NULL);
			if (*id < NR_CPUS)
				cpu_data(*id).core_id = core_id;
		} else {
			unsigned int j;

			for (j = 0; j < t->num_arcs; j++) {
				struct mdesc_node *n = t->arcs[j].arc;

				if (strcmp(t->arcs[j].name, "back"))
					continue;

				if (strcmp(n->name, "cpu"))
					continue;

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

static void __init set_core_ids(void)
{
	struct mdesc_node *mp;
	int idx;

	idx = 1;
	md_for_each_node_by_name(mp, "cache") {
		const u64 *level = md_get_property(mp, "level", NULL);
		const char *type;
		int len;

		if (*level != 1)
			continue;

		type = md_get_property(mp, "type", &len);
		if (!find_in_proplist(type, "instn", len))
			continue;

		mark_core_ids(mp, idx);

		idx++;
	}
}

static void __init mark_proc_ids(struct mdesc_node *mp, int proc_id)
{
	int i;

	for (i = 0; i < mp->num_arcs; i++) {
		struct mdesc_node *t = mp->arcs[i].arc;
		const u64 *id;

		if (strcmp(mp->arcs[i].name, "back"))
			continue;

		if (strcmp(t->name, "cpu"))
			continue;

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

static void __init __set_proc_ids(const char *exec_unit_name)
{
	struct mdesc_node *mp;
	int idx;

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

		type = md_get_property(mp, "type", &len);
		if (!find_in_proplist(type, "int", len) &&
		    !find_in_proplist(type, "integer", len))
			continue;

		mark_proc_ids(mp, idx);

		idx++;
	}
}

static void __init set_proc_ids(void)
{
	__set_proc_ids("exec_unit");
	__set_proc_ids("exec-unit");
}

static void __init 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 __init get_mondo_data(struct mdesc_node *mp, struct trap_per_cpu *tb)
{
	const u64 *val;

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

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

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

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

static void __init mdesc_fill_in_cpu_data(void)
{
	struct mdesc_node *mp;

	ncpus_probed = 0;
	md_for_each_node_by_name(mp, "cpu") {
		const u64 *id = md_get_property(mp, "id", NULL);
		const u64 *cfreq = md_get_property(mp, "clock-frequency", NULL);
		struct trap_per_cpu *tb;
		cpuinfo_sparc *c;
		unsigned int i;
		int cpuid;

		ncpus_probed++;

		cpuid = *id;

#ifdef CONFIG_SMP
		if (cpuid >= NR_CPUS)
			continue;
#else
		/* 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())
			continue;
		cpuid = 0;
#endif

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

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

		for (i = 0; i < mp->num_arcs; i++) {
			struct mdesc_node *t = mp->arcs[i].arc;
			unsigned int j;

			if (strcmp(mp->arcs[i].name, "fwd"))
				continue;

			if (!strcmp(t->name, "cache")) {
				fill_in_one_cache(c, t);
				continue;
			}

			for (j = 0; j < t->num_arcs; j++) {
				struct mdesc_node *n;

				n = t->arcs[j].arc;
				if (strcmp(t->arcs[j].name, "fwd"))
					continue;

				if (!strcmp(n->name, "cache"))
					fill_in_one_cache(c, n);
			}
		}

#ifdef CONFIG_SMP
		cpu_set(cpuid, cpu_present_map);
		cpu_set(cpuid, phys_cpu_present_map);
#endif

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

#ifdef CONFIG_SMP
	sparc64_multi_core = 1;
#endif

	set_core_ids();
	set_proc_ids();

	smp_fill_in_sib_core_maps();
}

void __init sun4v_mdesc_init(void)
{
	unsigned long len, real_len, status;

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

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

	main_mdesc = mdesc_early_alloc(len);

	status = sun4v_mach_desc(__pa(main_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);
		prom_halt();
	}

	len = count_nodes(main_mdesc);
	printk("MDESC: %lu nodes.\n", len);

	len = roundup_pow_of_two(len);

	mdesc_hash = mdesc_early_alloc(len * sizeof(struct mdesc_node *));
	mdesc_hash_size = len;

	printk("MDESC: Hash size %lu entries.\n", len);

	build_all_nodes(main_mdesc);

	printk("MDESC: Built graph with %u bytes of memory.\n",
	       mdesc_early_allocated);

	report_platform_properties();
	mdesc_fill_in_cpu_data();
}