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ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / arch / sparc64 / kernel / mdesc.c
blobdde52bcf5c64e11daa1cd22558238ebd45eb46b9
1 /* mdesc.c: Sun4V machine description handling.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4 */
5 #include <linux/kernel.h>
6 #include <linux/types.h>
7 #include <linux/lmb.h>
8 #include <linux/log2.h>
9 #include <linux/list.h>
10 #include <linux/slab.h>
11 #include <linux/mm.h>
12 #include <linux/miscdevice.h>
13
14 #include <asm/hypervisor.h>
15 #include <asm/mdesc.h>
16 #include <asm/prom.h>
17 #include <asm/oplib.h>
18 #include <asm/smp.h>
19
20 /* Unlike the OBP device tree, the machine description is a full-on
21 * DAG. An arbitrary number of ARCs are possible from one
22 * node to other nodes and thus we can't use the OBP device_node
23 * data structure to represent these nodes inside of the kernel.
24 *
25 * Actually, it isn't even a DAG, because there are back pointers
26 * which create cycles in the graph.
27 *
28 * mdesc_hdr and mdesc_elem describe the layout of the data structure
29 * we get from the Hypervisor.
30 */
31 struct mdesc_hdr {
32 u32 version; /* Transport version */
33 u32 node_sz; /* node block size */
34 u32 name_sz; /* name block size */
35 u32 data_sz; /* data block size */
36 } __attribute__((aligned(16)));
37
38 struct mdesc_elem {
39 u8 tag;
40 #define MD_LIST_END 0x00
41 #define MD_NODE 0x4e
42 #define MD_NODE_END 0x45
43 #define MD_NOOP 0x20
44 #define MD_PROP_ARC 0x61
45 #define MD_PROP_VAL 0x76
46 #define MD_PROP_STR 0x73
47 #define MD_PROP_DATA 0x64
48 u8 name_len;
49 u16 resv;
50 u32 name_offset;
51 union {
52 struct {
53 u32 data_len;
54 u32 data_offset;
55 } data;
56 u64 val;
57 } d;
58 };
59
60 struct mdesc_mem_ops {
61 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
62 void (*free)(struct mdesc_handle *handle);
63 };
64
65 struct mdesc_handle {
66 struct list_head list;
67 struct mdesc_mem_ops *mops;
68 void *self_base;
69 atomic_t refcnt;
70 unsigned int handle_size;
71 struct mdesc_hdr mdesc;
72 };
73
74 static void mdesc_handle_init(struct mdesc_handle *hp,
75 unsigned int handle_size,
76 void *base)
77 {
78 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
79
80 memset(hp, 0, handle_size);
81 INIT_LIST_HEAD(&hp->list);
82 hp->self_base = base;
83 atomic_set(&hp->refcnt, 1);
84 hp->handle_size = handle_size;
85 }
86
87 static struct mdesc_handle * __init mdesc_lmb_alloc(unsigned int mdesc_size)
88 {
89 unsigned int handle_size, alloc_size;
90 struct mdesc_handle *hp;
91 unsigned long paddr;
92
93 handle_size = (sizeof(struct mdesc_handle) -
94 sizeof(struct mdesc_hdr) +
95 mdesc_size);
96 alloc_size = PAGE_ALIGN(handle_size);
97
98 paddr = lmb_alloc(alloc_size, PAGE_SIZE);
99
100 hp = NULL;
101 if (paddr) {
102 hp = __va(paddr);
103 mdesc_handle_init(hp, handle_size, hp);
104 }
105 return hp;
106 }
107
108 static void mdesc_lmb_free(struct mdesc_handle *hp)
109 {
110 unsigned int alloc_size, handle_size = hp->handle_size;
111 unsigned long start, end;
112
113 BUG_ON(atomic_read(&hp->refcnt) != 0);
114 BUG_ON(!list_empty(&hp->list));
115
116 alloc_size = PAGE_ALIGN(handle_size);
117
118 start = (unsigned long) hp;
119 end = start + alloc_size;
120
121 while (start < end) {
122 struct page *p;
123
124 p = virt_to_page(start);
125 ClearPageReserved(p);
126 __free_page(p);
127 start += PAGE_SIZE;
128 }
129 }
130
131 static struct mdesc_mem_ops lmb_mdesc_ops = {
132 .alloc = mdesc_lmb_alloc,
133 .free = mdesc_lmb_free,
134 };
135
136 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
137 {
138 unsigned int handle_size;
139 void *base;
140
141 handle_size = (sizeof(struct mdesc_handle) -
142 sizeof(struct mdesc_hdr) +
143 mdesc_size);
144
145 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
146 if (base) {
147 struct mdesc_handle *hp;
148 unsigned long addr;
149
150 addr = (unsigned long)base;
151 addr = (addr + 15UL) & ~15UL;
152 hp = (struct mdesc_handle *) addr;
153
154 mdesc_handle_init(hp, handle_size, base);
155 return hp;
156 }
157
158 return NULL;
159 }
160
161 static void mdesc_kfree(struct mdesc_handle *hp)
162 {
163 BUG_ON(atomic_read(&hp->refcnt) != 0);
164 BUG_ON(!list_empty(&hp->list));
165
166 kfree(hp->self_base);
167 }
168
169 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
170 .alloc = mdesc_kmalloc,
171 .free = mdesc_kfree,
172 };
173
174 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
175 struct mdesc_mem_ops *mops)
176 {
177 struct mdesc_handle *hp = mops->alloc(mdesc_size);
178
179 if (hp)
180 hp->mops = mops;
181
182 return hp;
183 }
184
185 static void mdesc_free(struct mdesc_handle *hp)
186 {
187 hp->mops->free(hp);
188 }
189
190 static struct mdesc_handle *cur_mdesc;
191 static LIST_HEAD(mdesc_zombie_list);
192 static DEFINE_SPINLOCK(mdesc_lock);
193
194 struct mdesc_handle *mdesc_grab(void)
195 {
196 struct mdesc_handle *hp;
197 unsigned long flags;
198
199 spin_lock_irqsave(&mdesc_lock, flags);
200 hp = cur_mdesc;
201 if (hp)
202 atomic_inc(&hp->refcnt);
203 spin_unlock_irqrestore(&mdesc_lock, flags);
204
205 return hp;
206 }
207 EXPORT_SYMBOL(mdesc_grab);
208
209 void mdesc_release(struct mdesc_handle *hp)
210 {
211 unsigned long flags;
212
213 spin_lock_irqsave(&mdesc_lock, flags);
214 if (atomic_dec_and_test(&hp->refcnt)) {
215 list_del_init(&hp->list);
216 hp->mops->free(hp);
217 }
218 spin_unlock_irqrestore(&mdesc_lock, flags);
219 }
220 EXPORT_SYMBOL(mdesc_release);
221
222 static DEFINE_MUTEX(mdesc_mutex);
223 static struct mdesc_notifier_client *client_list;
224
225 void mdesc_register_notifier(struct mdesc_notifier_client *client)
226 {
227 u64 node;
228
229 mutex_lock(&mdesc_mutex);
230 client->next = client_list;
231 client_list = client;
232
233 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
234 client->add(cur_mdesc, node);
235
236 mutex_unlock(&mdesc_mutex);
237 }
238
239 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
240 {
241 const u64 *id;
242 u64 a;
243
244 id = NULL;
245 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
246 u64 target;
247
248 target = mdesc_arc_target(hp, a);
249 id = mdesc_get_property(hp, target,
250 "cfg-handle", NULL);
251 if (id)
252 break;
253 }
254
255 return id;
256 }
257
258 /* Run 'func' on nodes which are in A but not in B. */
259 static void invoke_on_missing(const char *name,
260 struct mdesc_handle *a,
261 struct mdesc_handle *b,
262 void (*func)(struct mdesc_handle *, u64))
263 {
264 u64 node;
265
266 mdesc_for_each_node_by_name(a, node, name) {
267 int found = 0, is_vdc_port = 0;
268 const char *name_prop;
269 const u64 *id;
270 u64 fnode;
271
272 name_prop = mdesc_get_property(a, node, "name", NULL);
273 if (name_prop && !strcmp(name_prop, "vdc-port")) {
274 is_vdc_port = 1;
275 id = parent_cfg_handle(a, node);
276 } else
277 id = mdesc_get_property(a, node, "id", NULL);
278
279 if (!id) {
280 printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
281 (name_prop ? name_prop : name));
282 continue;
283 }
284
285 mdesc_for_each_node_by_name(b, fnode, name) {
286 const u64 *fid;
287
288 if (is_vdc_port) {
289 name_prop = mdesc_get_property(b, fnode,
290 "name", NULL);
291 if (!name_prop ||
292 strcmp(name_prop, "vdc-port"))
293 continue;
294 fid = parent_cfg_handle(b, fnode);
295 if (!fid) {
296 printk(KERN_ERR "MD: Cannot find ID "
297 "for vdc-port node.\n");
298 continue;
299 }
300 } else
301 fid = mdesc_get_property(b, fnode,
302 "id", NULL);
303
304 if (*id == *fid) {
305 found = 1;
306 break;
307 }
308 }
309 if (!found)
310 func(a, node);
311 }
312 }
313
314 static void notify_one(struct mdesc_notifier_client *p,
315 struct mdesc_handle *old_hp,
316 struct mdesc_handle *new_hp)
317 {
318 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
319 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
320 }
321
322 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
323 struct mdesc_handle *new_hp)
324 {
325 struct mdesc_notifier_client *p = client_list;
326
327 while (p) {
328 notify_one(p, old_hp, new_hp);
329 p = p->next;
330 }
331 }
332
333 void mdesc_update(void)
334 {
335 unsigned long len, real_len, status;
336 struct mdesc_handle *hp, *orig_hp;
337 unsigned long flags;
338
339 mutex_lock(&mdesc_mutex);
340
341 (void) sun4v_mach_desc(0UL, 0UL, &len);
342
343 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
344 if (!hp) {
345 printk(KERN_ERR "MD: mdesc alloc fails\n");
346 goto out;
347 }
348
349 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
350 if (status != HV_EOK || real_len > len) {
351 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
352 status);
353 atomic_dec(&hp->refcnt);
354 mdesc_free(hp);
355 goto out;
356 }
357
358 spin_lock_irqsave(&mdesc_lock, flags);
359 orig_hp = cur_mdesc;
360 cur_mdesc = hp;
361 spin_unlock_irqrestore(&mdesc_lock, flags);
362
363 mdesc_notify_clients(orig_hp, hp);
364
365 spin_lock_irqsave(&mdesc_lock, flags);
366 if (atomic_dec_and_test(&orig_hp->refcnt))
367 mdesc_free(orig_hp);
368 else
369 list_add(&orig_hp->list, &mdesc_zombie_list);
370 spin_unlock_irqrestore(&mdesc_lock, flags);
371
372 out:
373 mutex_unlock(&mdesc_mutex);
374 }
375
376 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
377 {
378 return (struct mdesc_elem *) (mdesc + 1);
379 }
380
381 static void *name_block(struct mdesc_hdr *mdesc)
382 {
383 return ((void *) node_block(mdesc)) + mdesc->node_sz;
384 }
385
386 static void *data_block(struct mdesc_hdr *mdesc)
387 {
388 return ((void *) name_block(mdesc)) + mdesc->name_sz;
389 }
390
391 u64 mdesc_node_by_name(struct mdesc_handle *hp,
392 u64 from_node, const char *name)
393 {
394 struct mdesc_elem *ep = node_block(&hp->mdesc);
395 const char *names = name_block(&hp->mdesc);
396 u64 last_node = hp->mdesc.node_sz / 16;
397 u64 ret;
398
399 if (from_node == MDESC_NODE_NULL) {
400 ret = from_node = 0;
401 } else if (from_node >= last_node) {
402 return MDESC_NODE_NULL;
403 } else {
404 ret = ep[from_node].d.val;
405 }
406
407 while (ret < last_node) {
408 if (ep[ret].tag != MD_NODE)
409 return MDESC_NODE_NULL;
410 if (!strcmp(names + ep[ret].name_offset, name))
411 break;
412 ret = ep[ret].d.val;
413 }
414 if (ret >= last_node)
415 ret = MDESC_NODE_NULL;
416 return ret;
417 }
418 EXPORT_SYMBOL(mdesc_node_by_name);
419
420 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
421 const char *name, int *lenp)
422 {
423 const char *names = name_block(&hp->mdesc);
424 u64 last_node = hp->mdesc.node_sz / 16;
425 void *data = data_block(&hp->mdesc);
426 struct mdesc_elem *ep;
427
428 if (node == MDESC_NODE_NULL || node >= last_node)
429 return NULL;
430
431 ep = node_block(&hp->mdesc) + node;
432 ep++;
433 for (; ep->tag != MD_NODE_END; ep++) {
434 void *val = NULL;
435 int len = 0;
436
437 switch (ep->tag) {
438 case MD_PROP_VAL:
439 val = &ep->d.val;
440 len = 8;
441 break;
442
443 case MD_PROP_STR:
444 case MD_PROP_DATA:
445 val = data + ep->d.data.data_offset;
446 len = ep->d.data.data_len;
447 break;
448
449 default:
450 break;
451 }
452 if (!val)
453 continue;
454
455 if (!strcmp(names + ep->name_offset, name)) {
456 if (lenp)
457 *lenp = len;
458 return val;
459 }
460 }
461
462 return NULL;
463 }
464 EXPORT_SYMBOL(mdesc_get_property);
465
466 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
467 {
468 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
469 const char *names = name_block(&hp->mdesc);
470 u64 last_node = hp->mdesc.node_sz / 16;
471
472 if (from == MDESC_NODE_NULL || from >= last_node)
473 return MDESC_NODE_NULL;
474
475 ep = base + from;
476
477 ep++;
478 for (; ep->tag != MD_NODE_END; ep++) {
479 if (ep->tag != MD_PROP_ARC)
480 continue;
481
482 if (strcmp(names + ep->name_offset, arc_type))
483 continue;
484
485 return ep - base;
486 }
487
488 return MDESC_NODE_NULL;
489 }
490 EXPORT_SYMBOL(mdesc_next_arc);
491
492 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
493 {
494 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
495
496 ep = base + arc;
497
498 return ep->d.val;
499 }
500 EXPORT_SYMBOL(mdesc_arc_target);
501
502 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
503 {
504 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
505 const char *names = name_block(&hp->mdesc);
506 u64 last_node = hp->mdesc.node_sz / 16;
507
508 if (node == MDESC_NODE_NULL || node >= last_node)
509 return NULL;
510
511 ep = base + node;
512 if (ep->tag != MD_NODE)
513 return NULL;
514
515 return names + ep->name_offset;
516 }
517 EXPORT_SYMBOL(mdesc_node_name);
518
519 static void __init report_platform_properties(void)
520 {
521 struct mdesc_handle *hp = mdesc_grab();
522 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
523 const char *s;
524 const u64 *v;
525
526 if (pn == MDESC_NODE_NULL) {
527 prom_printf("No platform node in machine-description.\n");
528 prom_halt();
529 }
530
531 s = mdesc_get_property(hp, pn, "banner-name", NULL);
532 printk("PLATFORM: banner-name [%s]\n", s);
533 s = mdesc_get_property(hp, pn, "name", NULL);
534 printk("PLATFORM: name [%s]\n", s);
535
536 v = mdesc_get_property(hp, pn, "hostid", NULL);
537 if (v)
538 printk("PLATFORM: hostid [%08lx]\n", *v);
539 v = mdesc_get_property(hp, pn, "serial#", NULL);
540 if (v)
541 printk("PLATFORM: serial# [%08lx]\n", *v);
542 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
543 printk("PLATFORM: stick-frequency [%08lx]\n", *v);
544 v = mdesc_get_property(hp, pn, "mac-address", NULL);
545 if (v)
546 printk("PLATFORM: mac-address [%lx]\n", *v);
547 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
548 if (v)
549 printk("PLATFORM: watchdog-resolution [%lu ms]\n", *v);
550 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
551 if (v)
552 printk("PLATFORM: watchdog-max-timeout [%lu ms]\n", *v);
553 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
554 if (v)
555 printk("PLATFORM: max-cpus [%lu]\n", *v);
556
557 #ifdef CONFIG_SMP
558 {
559 int max_cpu, i;
560
561 if (v) {
562 max_cpu = *v;
563 if (max_cpu > NR_CPUS)
564 max_cpu = NR_CPUS;
565 } else {
566 max_cpu = NR_CPUS;
567 }
568 for (i = 0; i < max_cpu; i++)
569 cpu_set(i, cpu_possible_map);
570 }
571 #endif
572
573 mdesc_release(hp);
574 }
575
576 static void __devinit fill_in_one_cache(cpuinfo_sparc *c,
577 struct mdesc_handle *hp,
578 u64 mp)
579 {
580 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
581 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
582 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
583 const char *type;
584 int type_len;
585
586 type = mdesc_get_property(hp, mp, "type", &type_len);
587
588 switch (*level) {
589 case 1:
590 if (of_find_in_proplist(type, "instn", type_len)) {
591 c->icache_size = *size;
592 c->icache_line_size = *line_size;
593 } else if (of_find_in_proplist(type, "data", type_len)) {
594 c->dcache_size = *size;
595 c->dcache_line_size = *line_size;
596 }
597 break;
598
599 case 2:
600 c->ecache_size = *size;
601 c->ecache_line_size = *line_size;
602 break;
603
604 default:
605 break;
606 }
607
608 if (*level == 1) {
609 u64 a;
610
611 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
612 u64 target = mdesc_arc_target(hp, a);
613 const char *name = mdesc_node_name(hp, target);
614
615 if (!strcmp(name, "cache"))
616 fill_in_one_cache(c, hp, target);
617 }
618 }
619 }
620
621 static void __devinit mark_core_ids(struct mdesc_handle *hp, u64 mp,
622 int core_id)
623 {
624 u64 a;
625
626 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
627 u64 t = mdesc_arc_target(hp, a);
628 const char *name;
629 const u64 *id;
630
631 name = mdesc_node_name(hp, t);
632 if (!strcmp(name, "cpu")) {
633 id = mdesc_get_property(hp, t, "id", NULL);
634 if (*id < NR_CPUS)
635 cpu_data(*id).core_id = core_id;
636 } else {
637 u64 j;
638
639 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
640 u64 n = mdesc_arc_target(hp, j);
641 const char *n_name;
642
643 n_name = mdesc_node_name(hp, n);
644 if (strcmp(n_name, "cpu"))
645 continue;
646
647 id = mdesc_get_property(hp, n, "id", NULL);
648 if (*id < NR_CPUS)
649 cpu_data(*id).core_id = core_id;
650 }
651 }
652 }
653 }
654
655 static void __devinit set_core_ids(struct mdesc_handle *hp)
656 {
657 int idx;
658 u64 mp;
659
660 idx = 1;
661 mdesc_for_each_node_by_name(hp, mp, "cache") {
662 const u64 *level;
663 const char *type;
664 int len;
665
666 level = mdesc_get_property(hp, mp, "level", NULL);
667 if (*level != 1)
668 continue;
669
670 type = mdesc_get_property(hp, mp, "type", &len);
671 if (!of_find_in_proplist(type, "instn", len))
672 continue;
673
674 mark_core_ids(hp, mp, idx);
675
676 idx++;
677 }
678 }
679
680 static void __devinit mark_proc_ids(struct mdesc_handle *hp, u64 mp,
681 int proc_id)
682 {
683 u64 a;
684
685 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
686 u64 t = mdesc_arc_target(hp, a);
687 const char *name;
688 const u64 *id;
689
690 name = mdesc_node_name(hp, t);
691 if (strcmp(name, "cpu"))
692 continue;
693
694 id = mdesc_get_property(hp, t, "id", NULL);
695 if (*id < NR_CPUS)
696 cpu_data(*id).proc_id = proc_id;
697 }
698 }
699
700 static void __devinit __set_proc_ids(struct mdesc_handle *hp,
701 const char *exec_unit_name)
702 {
703 int idx;
704 u64 mp;
705
706 idx = 0;
707 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
708 const char *type;
709 int len;
710
711 type = mdesc_get_property(hp, mp, "type", &len);
712 if (!of_find_in_proplist(type, "int", len) &&
713 !of_find_in_proplist(type, "integer", len))
714 continue;
715
716 mark_proc_ids(hp, mp, idx);
717
718 idx++;
719 }
720 }
721
722 static void __devinit set_proc_ids(struct mdesc_handle *hp)
723 {
724 __set_proc_ids(hp, "exec_unit");
725 __set_proc_ids(hp, "exec-unit");
726 }
727
728 static void __devinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
729 unsigned char def)
730 {
731 u64 val;
732
733 if (!p)
734 goto use_default;
735 val = *p;
736
737 if (!val || val >= 64)
738 goto use_default;
739
740 *mask = ((1U << val) * 64U) - 1U;
741 return;
742
743 use_default:
744 *mask = ((1U << def) * 64U) - 1U;
745 }
746
747 static void __devinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
748 struct trap_per_cpu *tb)
749 {
750 const u64 *val;
751
752 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
753 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7);
754
755 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
756 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7);
757
758 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
759 get_one_mondo_bits(val, &tb->resum_qmask, 6);
760
761 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
762 get_one_mondo_bits(val, &tb->nonresum_qmask, 2);
763 }
764
765 void __cpuinit mdesc_fill_in_cpu_data(cpumask_t mask)
766 {
767 struct mdesc_handle *hp = mdesc_grab();
768 u64 mp;
769
770 ncpus_probed = 0;
771 mdesc_for_each_node_by_name(hp, mp, "cpu") {
772 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
773 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
774 struct trap_per_cpu *tb;
775 cpuinfo_sparc *c;
776 int cpuid;
777 u64 a;
778
779 ncpus_probed++;
780
781 cpuid = *id;
782
783 #ifdef CONFIG_SMP
784 if (cpuid >= NR_CPUS) {
785 printk(KERN_WARNING "Ignoring CPU %d which is "
786 ">= NR_CPUS (%d)\n",
787 cpuid, NR_CPUS);
788 continue;
789 }
790 if (!cpu_isset(cpuid, mask))
791 continue;
792 #else
793 /* On uniprocessor we only want the values for the
794 * real physical cpu the kernel booted onto, however
795 * cpu_data() only has one entry at index 0.
796 */
797 if (cpuid != real_hard_smp_processor_id())
798 continue;
799 cpuid = 0;
800 #endif
801
802 c = &cpu_data(cpuid);
803 c->clock_tick = *cfreq;
804
805 tb = &trap_block[cpuid];
806 get_mondo_data(hp, mp, tb);
807
808 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
809 u64 j, t = mdesc_arc_target(hp, a);
810 const char *t_name;
811
812 t_name = mdesc_node_name(hp, t);
813 if (!strcmp(t_name, "cache")) {
814 fill_in_one_cache(c, hp, t);
815 continue;
816 }
817
818 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
819 u64 n = mdesc_arc_target(hp, j);
820 const char *n_name;
821
822 n_name = mdesc_node_name(hp, n);
823 if (!strcmp(n_name, "cache"))
824 fill_in_one_cache(c, hp, n);
825 }
826 }
827
828 #ifdef CONFIG_SMP
829 cpu_set(cpuid, cpu_present_map);
830 #endif
831
832 c->core_id = 0;
833 c->proc_id = -1;
834 }
835
836 #ifdef CONFIG_SMP
837 sparc64_multi_core = 1;
838 #endif
839
840 set_core_ids(hp);
841 set_proc_ids(hp);
842
843 smp_fill_in_sib_core_maps();
844
845 mdesc_release(hp);
846 }
847
848 static ssize_t mdesc_read(struct file *file, char __user *buf,
849 size_t len, loff_t *offp)
850 {
851 struct mdesc_handle *hp = mdesc_grab();
852 int err;
853
854 if (!hp)
855 return -ENODEV;
856
857 err = hp->handle_size;
858 if (len < hp->handle_size)
859 err = -EMSGSIZE;
860 else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
861 err = -EFAULT;
862 mdesc_release(hp);
863
864 return err;
865 }
866
867 static const struct file_operations mdesc_fops = {
868 .read = mdesc_read,
869 .owner = THIS_MODULE,
870 };
871
872 static struct miscdevice mdesc_misc = {
873 .minor = MISC_DYNAMIC_MINOR,
874 .name = "mdesc",
875 .fops = &mdesc_fops,
876 };
877
878 static int __init mdesc_misc_init(void)
879 {
880 return misc_register(&mdesc_misc);
881 }
882
883 __initcall(mdesc_misc_init);
884
885 void __init sun4v_mdesc_init(void)
886 {
887 struct mdesc_handle *hp;
888 unsigned long len, real_len, status;
889 cpumask_t mask;
890
891 (void) sun4v_mach_desc(0UL, 0UL, &len);
892
893 printk("MDESC: Size is %lu bytes.\n", len);
894
895 hp = mdesc_alloc(len, &lmb_mdesc_ops);
896 if (hp == NULL) {
897 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
898 prom_halt();
899 }
900
901 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
902 if (status != HV_EOK || real_len > len) {
903 prom_printf("sun4v_mach_desc fails, err(%lu), "
904 "len(%lu), real_len(%lu)\n",
905 status, len, real_len);
906 mdesc_free(hp);
907 prom_halt();
908 }
909
910 cur_mdesc = hp;
911
912 report_platform_properties();
913
914 cpus_setall(mask);
915 mdesc_fill_in_cpu_data(mask);
916 }
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