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retransmit send timing bugfix
[cor_2_6_31.git] / arch / sparc / kernel / mdesc.c
blob938da19dc06527d755d7ce0a9cc8171b39f654c7
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/cpudata.h>
15 #include <asm/hypervisor.h>
16 #include <asm/mdesc.h>
17 #include <asm/prom.h>
18 #include <asm/oplib.h>
19 #include <asm/smp.h>
20
21 /* Unlike the OBP device tree, the machine description is a full-on
22 * DAG. An arbitrary number of ARCs are possible from one
23 * node to other nodes and thus we can't use the OBP device_node
24 * data structure to represent these nodes inside of the kernel.
25 *
26 * Actually, it isn't even a DAG, because there are back pointers
27 * which create cycles in the graph.
28 *
29 * mdesc_hdr and mdesc_elem describe the layout of the data structure
30 * we get from the Hypervisor.
31 */
32 struct mdesc_hdr {
33 u32 version; /* Transport version */
34 u32 node_sz; /* node block size */
35 u32 name_sz; /* name block size */
36 u32 data_sz; /* data block size */
37 } __attribute__((aligned(16)));
38
39 struct mdesc_elem {
40 u8 tag;
41 #define MD_LIST_END 0x00
42 #define MD_NODE 0x4e
43 #define MD_NODE_END 0x45
44 #define MD_NOOP 0x20
45 #define MD_PROP_ARC 0x61
46 #define MD_PROP_VAL 0x76
47 #define MD_PROP_STR 0x73
48 #define MD_PROP_DATA 0x64
49 u8 name_len;
50 u16 resv;
51 u32 name_offset;
52 union {
53 struct {
54 u32 data_len;
55 u32 data_offset;
56 } data;
57 u64 val;
58 } d;
59 };
60
61 struct mdesc_mem_ops {
62 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
63 void (*free)(struct mdesc_handle *handle);
64 };
65
66 struct mdesc_handle {
67 struct list_head list;
68 struct mdesc_mem_ops *mops;
69 void *self_base;
70 atomic_t refcnt;
71 unsigned int handle_size;
72 struct mdesc_hdr mdesc;
73 };
74
75 static void mdesc_handle_init(struct mdesc_handle *hp,
76 unsigned int handle_size,
77 void *base)
78 {
79 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
80
81 memset(hp, 0, handle_size);
82 INIT_LIST_HEAD(&hp->list);
83 hp->self_base = base;
84 atomic_set(&hp->refcnt, 1);
85 hp->handle_size = handle_size;
86 }
87
88 static struct mdesc_handle * __init mdesc_lmb_alloc(unsigned int mdesc_size)
89 {
90 unsigned int handle_size, alloc_size;
91 struct mdesc_handle *hp;
92 unsigned long paddr;
93
94 handle_size = (sizeof(struct mdesc_handle) -
95 sizeof(struct mdesc_hdr) +
96 mdesc_size);
97 alloc_size = PAGE_ALIGN(handle_size);
98
99 paddr = lmb_alloc(alloc_size, PAGE_SIZE);
100
101 hp = NULL;
102 if (paddr) {
103 hp = __va(paddr);
104 mdesc_handle_init(hp, handle_size, hp);
105 }
106 return hp;
107 }
108
109 static void mdesc_lmb_free(struct mdesc_handle *hp)
110 {
111 unsigned int alloc_size, handle_size = hp->handle_size;
112 unsigned long start, end;
113
114 BUG_ON(atomic_read(&hp->refcnt) != 0);
115 BUG_ON(!list_empty(&hp->list));
116
117 alloc_size = PAGE_ALIGN(handle_size);
118
119 start = (unsigned long) hp;
120 end = start + alloc_size;
121
122 while (start < end) {
123 struct page *p;
124
125 p = virt_to_page(start);
126 ClearPageReserved(p);
127 __free_page(p);
128 start += PAGE_SIZE;
129 }
130 }
131
132 static struct mdesc_mem_ops lmb_mdesc_ops = {
133 .alloc = mdesc_lmb_alloc,
134 .free = mdesc_lmb_free,
135 };
136
137 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
138 {
139 unsigned int handle_size;
140 void *base;
141
142 handle_size = (sizeof(struct mdesc_handle) -
143 sizeof(struct mdesc_hdr) +
144 mdesc_size);
145
146 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
147 if (base) {
148 struct mdesc_handle *hp;
149 unsigned long addr;
150
151 addr = (unsigned long)base;
152 addr = (addr + 15UL) & ~15UL;
153 hp = (struct mdesc_handle *) addr;
154
155 mdesc_handle_init(hp, handle_size, base);
156 return hp;
157 }
158
159 return NULL;
160 }
161
162 static void mdesc_kfree(struct mdesc_handle *hp)
163 {
164 BUG_ON(atomic_read(&hp->refcnt) != 0);
165 BUG_ON(!list_empty(&hp->list));
166
167 kfree(hp->self_base);
168 }
169
170 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
171 .alloc = mdesc_kmalloc,
172 .free = mdesc_kfree,
173 };
174
175 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
176 struct mdesc_mem_ops *mops)
177 {
178 struct mdesc_handle *hp = mops->alloc(mdesc_size);
179
180 if (hp)
181 hp->mops = mops;
182
183 return hp;
184 }
185
186 static void mdesc_free(struct mdesc_handle *hp)
187 {
188 hp->mops->free(hp);
189 }
190
191 static struct mdesc_handle *cur_mdesc;
192 static LIST_HEAD(mdesc_zombie_list);
193 static DEFINE_SPINLOCK(mdesc_lock);
194
195 struct mdesc_handle *mdesc_grab(void)
196 {
197 struct mdesc_handle *hp;
198 unsigned long flags;
199
200 spin_lock_irqsave(&mdesc_lock, flags);
201 hp = cur_mdesc;
202 if (hp)
203 atomic_inc(&hp->refcnt);
204 spin_unlock_irqrestore(&mdesc_lock, flags);
205
206 return hp;
207 }
208 EXPORT_SYMBOL(mdesc_grab);
209
210 void mdesc_release(struct mdesc_handle *hp)
211 {
212 unsigned long flags;
213
214 spin_lock_irqsave(&mdesc_lock, flags);
215 if (atomic_dec_and_test(&hp->refcnt)) {
216 list_del_init(&hp->list);
217 hp->mops->free(hp);
218 }
219 spin_unlock_irqrestore(&mdesc_lock, flags);
220 }
221 EXPORT_SYMBOL(mdesc_release);
222
223 static DEFINE_MUTEX(mdesc_mutex);
224 static struct mdesc_notifier_client *client_list;
225
226 void mdesc_register_notifier(struct mdesc_notifier_client *client)
227 {
228 u64 node;
229
230 mutex_lock(&mdesc_mutex);
231 client->next = client_list;
232 client_list = client;
233
234 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
235 client->add(cur_mdesc, node);
236
237 mutex_unlock(&mdesc_mutex);
238 }
239
240 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
241 {
242 const u64 *id;
243 u64 a;
244
245 id = NULL;
246 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
247 u64 target;
248
249 target = mdesc_arc_target(hp, a);
250 id = mdesc_get_property(hp, target,
251 "cfg-handle", NULL);
252 if (id)
253 break;
254 }
255
256 return id;
257 }
258
259 /* Run 'func' on nodes which are in A but not in B. */
260 static void invoke_on_missing(const char *name,
261 struct mdesc_handle *a,
262 struct mdesc_handle *b,
263 void (*func)(struct mdesc_handle *, u64))
264 {
265 u64 node;
266
267 mdesc_for_each_node_by_name(a, node, name) {
268 int found = 0, is_vdc_port = 0;
269 const char *name_prop;
270 const u64 *id;
271 u64 fnode;
272
273 name_prop = mdesc_get_property(a, node, "name", NULL);
274 if (name_prop && !strcmp(name_prop, "vdc-port")) {
275 is_vdc_port = 1;
276 id = parent_cfg_handle(a, node);
277 } else
278 id = mdesc_get_property(a, node, "id", NULL);
279
280 if (!id) {
281 printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
282 (name_prop ? name_prop : name));
283 continue;
284 }
285
286 mdesc_for_each_node_by_name(b, fnode, name) {
287 const u64 *fid;
288
289 if (is_vdc_port) {
290 name_prop = mdesc_get_property(b, fnode,
291 "name", NULL);
292 if (!name_prop ||
293 strcmp(name_prop, "vdc-port"))
294 continue;
295 fid = parent_cfg_handle(b, fnode);
296 if (!fid) {
297 printk(KERN_ERR "MD: Cannot find ID "
298 "for vdc-port node.\n");
299 continue;
300 }
301 } else
302 fid = mdesc_get_property(b, fnode,
303 "id", NULL);
304
305 if (*id == *fid) {
306 found = 1;
307 break;
308 }
309 }
310 if (!found)
311 func(a, node);
312 }
313 }
314
315 static void notify_one(struct mdesc_notifier_client *p,
316 struct mdesc_handle *old_hp,
317 struct mdesc_handle *new_hp)
318 {
319 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
320 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
321 }
322
323 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
324 struct mdesc_handle *new_hp)
325 {
326 struct mdesc_notifier_client *p = client_list;
327
328 while (p) {
329 notify_one(p, old_hp, new_hp);
330 p = p->next;
331 }
332 }
333
334 void mdesc_update(void)
335 {
336 unsigned long len, real_len, status;
337 struct mdesc_handle *hp, *orig_hp;
338 unsigned long flags;
339
340 mutex_lock(&mdesc_mutex);
341
342 (void) sun4v_mach_desc(0UL, 0UL, &len);
343
344 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
345 if (!hp) {
346 printk(KERN_ERR "MD: mdesc alloc fails\n");
347 goto out;
348 }
349
350 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
351 if (status != HV_EOK || real_len > len) {
352 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
353 status);
354 atomic_dec(&hp->refcnt);
355 mdesc_free(hp);
356 goto out;
357 }
358
359 spin_lock_irqsave(&mdesc_lock, flags);
360 orig_hp = cur_mdesc;
361 cur_mdesc = hp;
362 spin_unlock_irqrestore(&mdesc_lock, flags);
363
364 mdesc_notify_clients(orig_hp, hp);
365
366 spin_lock_irqsave(&mdesc_lock, flags);
367 if (atomic_dec_and_test(&orig_hp->refcnt))
368 mdesc_free(orig_hp);
369 else
370 list_add(&orig_hp->list, &mdesc_zombie_list);
371 spin_unlock_irqrestore(&mdesc_lock, flags);
372
373 out:
374 mutex_unlock(&mdesc_mutex);
375 }
376
377 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
378 {
379 return (struct mdesc_elem *) (mdesc + 1);
380 }
381
382 static void *name_block(struct mdesc_hdr *mdesc)
383 {
384 return ((void *) node_block(mdesc)) + mdesc->node_sz;
385 }
386
387 static void *data_block(struct mdesc_hdr *mdesc)
388 {
389 return ((void *) name_block(mdesc)) + mdesc->name_sz;
390 }
391
392 u64 mdesc_node_by_name(struct mdesc_handle *hp,
393 u64 from_node, const char *name)
394 {
395 struct mdesc_elem *ep = node_block(&hp->mdesc);
396 const char *names = name_block(&hp->mdesc);
397 u64 last_node = hp->mdesc.node_sz / 16;
398 u64 ret;
399
400 if (from_node == MDESC_NODE_NULL) {
401 ret = from_node = 0;
402 } else if (from_node >= last_node) {
403 return MDESC_NODE_NULL;
404 } else {
405 ret = ep[from_node].d.val;
406 }
407
408 while (ret < last_node) {
409 if (ep[ret].tag != MD_NODE)
410 return MDESC_NODE_NULL;
411 if (!strcmp(names + ep[ret].name_offset, name))
412 break;
413 ret = ep[ret].d.val;
414 }
415 if (ret >= last_node)
416 ret = MDESC_NODE_NULL;
417 return ret;
418 }
419 EXPORT_SYMBOL(mdesc_node_by_name);
420
421 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
422 const char *name, int *lenp)
423 {
424 const char *names = name_block(&hp->mdesc);
425 u64 last_node = hp->mdesc.node_sz / 16;
426 void *data = data_block(&hp->mdesc);
427 struct mdesc_elem *ep;
428
429 if (node == MDESC_NODE_NULL || node >= last_node)
430 return NULL;
431
432 ep = node_block(&hp->mdesc) + node;
433 ep++;
434 for (; ep->tag != MD_NODE_END; ep++) {
435 void *val = NULL;
436 int len = 0;
437
438 switch (ep->tag) {
439 case MD_PROP_VAL:
440 val = &ep->d.val;
441 len = 8;
442 break;
443
444 case MD_PROP_STR:
445 case MD_PROP_DATA:
446 val = data + ep->d.data.data_offset;
447 len = ep->d.data.data_len;
448 break;
449
450 default:
451 break;
452 }
453 if (!val)
454 continue;
455
456 if (!strcmp(names + ep->name_offset, name)) {
457 if (lenp)
458 *lenp = len;
459 return val;
460 }
461 }
462
463 return NULL;
464 }
465 EXPORT_SYMBOL(mdesc_get_property);
466
467 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
468 {
469 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
470 const char *names = name_block(&hp->mdesc);
471 u64 last_node = hp->mdesc.node_sz / 16;
472
473 if (from == MDESC_NODE_NULL || from >= last_node)
474 return MDESC_NODE_NULL;
475
476 ep = base + from;
477
478 ep++;
479 for (; ep->tag != MD_NODE_END; ep++) {
480 if (ep->tag != MD_PROP_ARC)
481 continue;
482
483 if (strcmp(names + ep->name_offset, arc_type))
484 continue;
485
486 return ep - base;
487 }
488
489 return MDESC_NODE_NULL;
490 }
491 EXPORT_SYMBOL(mdesc_next_arc);
492
493 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
494 {
495 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
496
497 ep = base + arc;
498
499 return ep->d.val;
500 }
501 EXPORT_SYMBOL(mdesc_arc_target);
502
503 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
504 {
505 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
506 const char *names = name_block(&hp->mdesc);
507 u64 last_node = hp->mdesc.node_sz / 16;
508
509 if (node == MDESC_NODE_NULL || node >= last_node)
510 return NULL;
511
512 ep = base + node;
513 if (ep->tag != MD_NODE)
514 return NULL;
515
516 return names + ep->name_offset;
517 }
518 EXPORT_SYMBOL(mdesc_node_name);
519
520 static void __init report_platform_properties(void)
521 {
522 struct mdesc_handle *hp = mdesc_grab();
523 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
524 const char *s;
525 const u64 *v;
526
527 if (pn == MDESC_NODE_NULL) {
528 prom_printf("No platform node in machine-description.\n");
529 prom_halt();
530 }
531
532 s = mdesc_get_property(hp, pn, "banner-name", NULL);
533 printk("PLATFORM: banner-name [%s]\n", s);
534 s = mdesc_get_property(hp, pn, "name", NULL);
535 printk("PLATFORM: name [%s]\n", s);
536
537 v = mdesc_get_property(hp, pn, "hostid", NULL);
538 if (v)
539 printk("PLATFORM: hostid [%08llx]\n", *v);
540 v = mdesc_get_property(hp, pn, "serial#", NULL);
541 if (v)
542 printk("PLATFORM: serial# [%08llx]\n", *v);
543 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
544 printk("PLATFORM: stick-frequency [%08llx]\n", *v);
545 v = mdesc_get_property(hp, pn, "mac-address", NULL);
546 if (v)
547 printk("PLATFORM: mac-address [%llx]\n", *v);
548 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
549 if (v)
550 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
551 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
552 if (v)
553 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
554 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
555 if (v)
556 printk("PLATFORM: max-cpus [%llu]\n", *v);
557
558 #ifdef CONFIG_SMP
559 {
560 int max_cpu, i;
561
562 if (v) {
563 max_cpu = *v;
564 if (max_cpu > NR_CPUS)
565 max_cpu = NR_CPUS;
566 } else {
567 max_cpu = NR_CPUS;
568 }
569 for (i = 0; i < max_cpu; i++)
570 set_cpu_possible(i, true);
571 }
572 #endif
573
574 mdesc_release(hp);
575 }
576
577 static void __cpuinit fill_in_one_cache(cpuinfo_sparc *c,
578 struct mdesc_handle *hp,
579 u64 mp)
580 {
581 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
582 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
583 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
584 const char *type;
585 int type_len;
586
587 type = mdesc_get_property(hp, mp, "type", &type_len);
588
589 switch (*level) {
590 case 1:
591 if (of_find_in_proplist(type, "instn", type_len)) {
592 c->icache_size = *size;
593 c->icache_line_size = *line_size;
594 } else if (of_find_in_proplist(type, "data", type_len)) {
595 c->dcache_size = *size;
596 c->dcache_line_size = *line_size;
597 }
598 break;
599
600 case 2:
601 c->ecache_size = *size;
602 c->ecache_line_size = *line_size;
603 break;
604
605 default:
606 break;
607 }
608
609 if (*level == 1) {
610 u64 a;
611
612 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
613 u64 target = mdesc_arc_target(hp, a);
614 const char *name = mdesc_node_name(hp, target);
615
616 if (!strcmp(name, "cache"))
617 fill_in_one_cache(c, hp, target);
618 }
619 }
620 }
621
622 static void __cpuinit mark_core_ids(struct mdesc_handle *hp, u64 mp, 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 __cpuinit 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 __cpuinit mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
681 {
682 u64 a;
683
684 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
685 u64 t = mdesc_arc_target(hp, a);
686 const char *name;
687 const u64 *id;
688
689 name = mdesc_node_name(hp, t);
690 if (strcmp(name, "cpu"))
691 continue;
692
693 id = mdesc_get_property(hp, t, "id", NULL);
694 if (*id < NR_CPUS)
695 cpu_data(*id).proc_id = proc_id;
696 }
697 }
698
699 static void __cpuinit __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
700 {
701 int idx;
702 u64 mp;
703
704 idx = 0;
705 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
706 const char *type;
707 int len;
708
709 type = mdesc_get_property(hp, mp, "type", &len);
710 if (!of_find_in_proplist(type, "int", len) &&
711 !of_find_in_proplist(type, "integer", len))
712 continue;
713
714 mark_proc_ids(hp, mp, idx);
715
716 idx++;
717 }
718 }
719
720 static void __cpuinit set_proc_ids(struct mdesc_handle *hp)
721 {
722 __set_proc_ids(hp, "exec_unit");
723 __set_proc_ids(hp, "exec-unit");
724 }
725
726 static void __cpuinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
727 unsigned char def)
728 {
729 u64 val;
730
731 if (!p)
732 goto use_default;
733 val = *p;
734
735 if (!val || val >= 64)
736 goto use_default;
737
738 *mask = ((1U << val) * 64U) - 1U;
739 return;
740
741 use_default:
742 *mask = ((1U << def) * 64U) - 1U;
743 }
744
745 static void __cpuinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
746 struct trap_per_cpu *tb)
747 {
748 const u64 *val;
749
750 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
751 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7);
752
753 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
754 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7);
755
756 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
757 get_one_mondo_bits(val, &tb->resum_qmask, 6);
758
759 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
760 get_one_mondo_bits(val, &tb->nonresum_qmask, 2);
761 }
762
763 static void * __cpuinit mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
764 {
765 struct mdesc_handle *hp = mdesc_grab();
766 void *ret = NULL;
767 u64 mp;
768
769 mdesc_for_each_node_by_name(hp, mp, "cpu") {
770 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
771 int cpuid = *id;
772
773 #ifdef CONFIG_SMP
774 if (cpuid >= NR_CPUS) {
775 printk(KERN_WARNING "Ignoring CPU %d which is "
776 ">= NR_CPUS (%d)\n",
777 cpuid, NR_CPUS);
778 continue;
779 }
780 if (!cpu_isset(cpuid, *mask))
781 continue;
782 #endif
783
784 ret = func(hp, mp, cpuid, arg);
785 if (ret)
786 goto out;
787 }
788 out:
789 mdesc_release(hp);
790 return ret;
791 }
792
793 static void * __cpuinit record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
794 {
795 ncpus_probed++;
796 #ifdef CONFIG_SMP
797 set_cpu_present(cpuid, true);
798 #endif
799 return NULL;
800 }
801
802 void __cpuinit mdesc_populate_present_mask(cpumask_t *mask)
803 {
804 if (tlb_type != hypervisor)
805 return;
806
807 ncpus_probed = 0;
808 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
809 }
810
811 static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
812 {
813 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
814 struct trap_per_cpu *tb;
815 cpuinfo_sparc *c;
816 u64 a;
817
818 #ifndef CONFIG_SMP
819 /* On uniprocessor we only want the values for the
820 * real physical cpu the kernel booted onto, however
821 * cpu_data() only has one entry at index 0.
822 */
823 if (cpuid != real_hard_smp_processor_id())
824 return NULL;
825 cpuid = 0;
826 #endif
827
828 c = &cpu_data(cpuid);
829 c->clock_tick = *cfreq;
830
831 tb = &trap_block[cpuid];
832 get_mondo_data(hp, mp, tb);
833
834 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
835 u64 j, t = mdesc_arc_target(hp, a);
836 const char *t_name;
837
838 t_name = mdesc_node_name(hp, t);
839 if (!strcmp(t_name, "cache")) {
840 fill_in_one_cache(c, hp, t);
841 continue;
842 }
843
844 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
845 u64 n = mdesc_arc_target(hp, j);
846 const char *n_name;
847
848 n_name = mdesc_node_name(hp, n);
849 if (!strcmp(n_name, "cache"))
850 fill_in_one_cache(c, hp, n);
851 }
852 }
853
854 c->core_id = 0;
855 c->proc_id = -1;
856
857 return NULL;
858 }
859
860 void __cpuinit mdesc_fill_in_cpu_data(cpumask_t *mask)
861 {
862 struct mdesc_handle *hp;
863
864 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
865
866 #ifdef CONFIG_SMP
867 sparc64_multi_core = 1;
868 #endif
869
870 hp = mdesc_grab();
871
872 set_core_ids(hp);
873 set_proc_ids(hp);
874
875 mdesc_release(hp);
876
877 smp_fill_in_sib_core_maps();
878 }
879
880 static ssize_t mdesc_read(struct file *file, char __user *buf,
881 size_t len, loff_t *offp)
882 {
883 struct mdesc_handle *hp = mdesc_grab();
884 int err;
885
886 if (!hp)
887 return -ENODEV;
888
889 err = hp->handle_size;
890 if (len < hp->handle_size)
891 err = -EMSGSIZE;
892 else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
893 err = -EFAULT;
894 mdesc_release(hp);
895
896 return err;
897 }
898
899 static const struct file_operations mdesc_fops = {
900 .read = mdesc_read,
901 .owner = THIS_MODULE,
902 };
903
904 static struct miscdevice mdesc_misc = {
905 .minor = MISC_DYNAMIC_MINOR,
906 .name = "mdesc",
907 .fops = &mdesc_fops,
908 };
909
910 static int __init mdesc_misc_init(void)
911 {
912 return misc_register(&mdesc_misc);
913 }
914
915 __initcall(mdesc_misc_init);
916
917 void __init sun4v_mdesc_init(void)
918 {
919 struct mdesc_handle *hp;
920 unsigned long len, real_len, status;
921
922 (void) sun4v_mach_desc(0UL, 0UL, &len);
923
924 printk("MDESC: Size is %lu bytes.\n", len);
925
926 hp = mdesc_alloc(len, &lmb_mdesc_ops);
927 if (hp == NULL) {
928 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
929 prom_halt();
930 }
931
932 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
933 if (status != HV_EOK || real_len > len) {
934 prom_printf("sun4v_mach_desc fails, err(%lu), "
935 "len(%lu), real_len(%lu)\n",
936 status, len, real_len);
937 mdesc_free(hp);
938 prom_halt();
939 }
940
941 cur_mdesc = hp;
942
943 report_platform_properties();
944 }
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