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staging:iio:dds:ad9951: allocate chip state with iio_dev
[linux-2.6/next.git] / arch / sparc / kernel / mdesc.c
blob42f28c7420e1d99a1ac5abc3d44bc45a3e5fea54
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/memblock.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 #include <linux/bootmem.h>
14
15 #include <asm/cpudata.h>
16 #include <asm/hypervisor.h>
17 #include <asm/mdesc.h>
18 #include <asm/prom.h>
19 #include <asm/oplib.h>
20 #include <asm/smp.h>
21
22 /* Unlike the OBP device tree, the machine description is a full-on
23 * DAG. An arbitrary number of ARCs are possible from one
24 * node to other nodes and thus we can't use the OBP device_node
25 * data structure to represent these nodes inside of the kernel.
26 *
27 * Actually, it isn't even a DAG, because there are back pointers
28 * which create cycles in the graph.
29 *
30 * mdesc_hdr and mdesc_elem describe the layout of the data structure
31 * we get from the Hypervisor.
32 */
33 struct mdesc_hdr {
34 u32 version; /* Transport version */
35 u32 node_sz; /* node block size */
36 u32 name_sz; /* name block size */
37 u32 data_sz; /* data block size */
38 } __attribute__((aligned(16)));
39
40 struct mdesc_elem {
41 u8 tag;
42 #define MD_LIST_END 0x00
43 #define MD_NODE 0x4e
44 #define MD_NODE_END 0x45
45 #define MD_NOOP 0x20
46 #define MD_PROP_ARC 0x61
47 #define MD_PROP_VAL 0x76
48 #define MD_PROP_STR 0x73
49 #define MD_PROP_DATA 0x64
50 u8 name_len;
51 u16 resv;
52 u32 name_offset;
53 union {
54 struct {
55 u32 data_len;
56 u32 data_offset;
57 } data;
58 u64 val;
59 } d;
60 };
61
62 struct mdesc_mem_ops {
63 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
64 void (*free)(struct mdesc_handle *handle);
65 };
66
67 struct mdesc_handle {
68 struct list_head list;
69 struct mdesc_mem_ops *mops;
70 void *self_base;
71 atomic_t refcnt;
72 unsigned int handle_size;
73 struct mdesc_hdr mdesc;
74 };
75
76 static void mdesc_handle_init(struct mdesc_handle *hp,
77 unsigned int handle_size,
78 void *base)
79 {
80 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
81
82 memset(hp, 0, handle_size);
83 INIT_LIST_HEAD(&hp->list);
84 hp->self_base = base;
85 atomic_set(&hp->refcnt, 1);
86 hp->handle_size = handle_size;
87 }
88
89 static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
90 {
91 unsigned int handle_size, alloc_size;
92 struct mdesc_handle *hp;
93 unsigned long paddr;
94
95 handle_size = (sizeof(struct mdesc_handle) -
96 sizeof(struct mdesc_hdr) +
97 mdesc_size);
98 alloc_size = PAGE_ALIGN(handle_size);
99
100 paddr = memblock_alloc(alloc_size, PAGE_SIZE);
101
102 hp = NULL;
103 if (paddr) {
104 hp = __va(paddr);
105 mdesc_handle_init(hp, handle_size, hp);
106 }
107 return hp;
108 }
109
110 static void __init mdesc_memblock_free(struct mdesc_handle *hp)
111 {
112 unsigned int alloc_size;
113 unsigned long start;
114
115 BUG_ON(atomic_read(&hp->refcnt) != 0);
116 BUG_ON(!list_empty(&hp->list));
117
118 alloc_size = PAGE_ALIGN(hp->handle_size);
119 start = __pa(hp);
120 free_bootmem_late(start, alloc_size);
121 }
122
123 static struct mdesc_mem_ops memblock_mdesc_ops = {
124 .alloc = mdesc_memblock_alloc,
125 .free = mdesc_memblock_free,
126 };
127
128 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
129 {
130 unsigned int handle_size;
131 void *base;
132
133 handle_size = (sizeof(struct mdesc_handle) -
134 sizeof(struct mdesc_hdr) +
135 mdesc_size);
136
137 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
138 if (base) {
139 struct mdesc_handle *hp;
140 unsigned long addr;
141
142 addr = (unsigned long)base;
143 addr = (addr + 15UL) & ~15UL;
144 hp = (struct mdesc_handle *) addr;
145
146 mdesc_handle_init(hp, handle_size, base);
147 return hp;
148 }
149
150 return NULL;
151 }
152
153 static void mdesc_kfree(struct mdesc_handle *hp)
154 {
155 BUG_ON(atomic_read(&hp->refcnt) != 0);
156 BUG_ON(!list_empty(&hp->list));
157
158 kfree(hp->self_base);
159 }
160
161 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
162 .alloc = mdesc_kmalloc,
163 .free = mdesc_kfree,
164 };
165
166 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
167 struct mdesc_mem_ops *mops)
168 {
169 struct mdesc_handle *hp = mops->alloc(mdesc_size);
170
171 if (hp)
172 hp->mops = mops;
173
174 return hp;
175 }
176
177 static void mdesc_free(struct mdesc_handle *hp)
178 {
179 hp->mops->free(hp);
180 }
181
182 static struct mdesc_handle *cur_mdesc;
183 static LIST_HEAD(mdesc_zombie_list);
184 static DEFINE_SPINLOCK(mdesc_lock);
185
186 struct mdesc_handle *mdesc_grab(void)
187 {
188 struct mdesc_handle *hp;
189 unsigned long flags;
190
191 spin_lock_irqsave(&mdesc_lock, flags);
192 hp = cur_mdesc;
193 if (hp)
194 atomic_inc(&hp->refcnt);
195 spin_unlock_irqrestore(&mdesc_lock, flags);
196
197 return hp;
198 }
199 EXPORT_SYMBOL(mdesc_grab);
200
201 void mdesc_release(struct mdesc_handle *hp)
202 {
203 unsigned long flags;
204
205 spin_lock_irqsave(&mdesc_lock, flags);
206 if (atomic_dec_and_test(&hp->refcnt)) {
207 list_del_init(&hp->list);
208 hp->mops->free(hp);
209 }
210 spin_unlock_irqrestore(&mdesc_lock, flags);
211 }
212 EXPORT_SYMBOL(mdesc_release);
213
214 static DEFINE_MUTEX(mdesc_mutex);
215 static struct mdesc_notifier_client *client_list;
216
217 void mdesc_register_notifier(struct mdesc_notifier_client *client)
218 {
219 u64 node;
220
221 mutex_lock(&mdesc_mutex);
222 client->next = client_list;
223 client_list = client;
224
225 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
226 client->add(cur_mdesc, node);
227
228 mutex_unlock(&mdesc_mutex);
229 }
230
231 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
232 {
233 const u64 *id;
234 u64 a;
235
236 id = NULL;
237 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
238 u64 target;
239
240 target = mdesc_arc_target(hp, a);
241 id = mdesc_get_property(hp, target,
242 "cfg-handle", NULL);
243 if (id)
244 break;
245 }
246
247 return id;
248 }
249
250 /* Run 'func' on nodes which are in A but not in B. */
251 static void invoke_on_missing(const char *name,
252 struct mdesc_handle *a,
253 struct mdesc_handle *b,
254 void (*func)(struct mdesc_handle *, u64))
255 {
256 u64 node;
257
258 mdesc_for_each_node_by_name(a, node, name) {
259 int found = 0, is_vdc_port = 0;
260 const char *name_prop;
261 const u64 *id;
262 u64 fnode;
263
264 name_prop = mdesc_get_property(a, node, "name", NULL);
265 if (name_prop && !strcmp(name_prop, "vdc-port")) {
266 is_vdc_port = 1;
267 id = parent_cfg_handle(a, node);
268 } else
269 id = mdesc_get_property(a, node, "id", NULL);
270
271 if (!id) {
272 printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
273 (name_prop ? name_prop : name));
274 continue;
275 }
276
277 mdesc_for_each_node_by_name(b, fnode, name) {
278 const u64 *fid;
279
280 if (is_vdc_port) {
281 name_prop = mdesc_get_property(b, fnode,
282 "name", NULL);
283 if (!name_prop ||
284 strcmp(name_prop, "vdc-port"))
285 continue;
286 fid = parent_cfg_handle(b, fnode);
287 if (!fid) {
288 printk(KERN_ERR "MD: Cannot find ID "
289 "for vdc-port node.\n");
290 continue;
291 }
292 } else
293 fid = mdesc_get_property(b, fnode,
294 "id", NULL);
295
296 if (*id == *fid) {
297 found = 1;
298 break;
299 }
300 }
301 if (!found)
302 func(a, node);
303 }
304 }
305
306 static void notify_one(struct mdesc_notifier_client *p,
307 struct mdesc_handle *old_hp,
308 struct mdesc_handle *new_hp)
309 {
310 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
311 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
312 }
313
314 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
315 struct mdesc_handle *new_hp)
316 {
317 struct mdesc_notifier_client *p = client_list;
318
319 while (p) {
320 notify_one(p, old_hp, new_hp);
321 p = p->next;
322 }
323 }
324
325 void mdesc_update(void)
326 {
327 unsigned long len, real_len, status;
328 struct mdesc_handle *hp, *orig_hp;
329 unsigned long flags;
330
331 mutex_lock(&mdesc_mutex);
332
333 (void) sun4v_mach_desc(0UL, 0UL, &len);
334
335 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
336 if (!hp) {
337 printk(KERN_ERR "MD: mdesc alloc fails\n");
338 goto out;
339 }
340
341 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
342 if (status != HV_EOK || real_len > len) {
343 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
344 status);
345 atomic_dec(&hp->refcnt);
346 mdesc_free(hp);
347 goto out;
348 }
349
350 spin_lock_irqsave(&mdesc_lock, flags);
351 orig_hp = cur_mdesc;
352 cur_mdesc = hp;
353 spin_unlock_irqrestore(&mdesc_lock, flags);
354
355 mdesc_notify_clients(orig_hp, hp);
356
357 spin_lock_irqsave(&mdesc_lock, flags);
358 if (atomic_dec_and_test(&orig_hp->refcnt))
359 mdesc_free(orig_hp);
360 else
361 list_add(&orig_hp->list, &mdesc_zombie_list);
362 spin_unlock_irqrestore(&mdesc_lock, flags);
363
364 out:
365 mutex_unlock(&mdesc_mutex);
366 }
367
368 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
369 {
370 return (struct mdesc_elem *) (mdesc + 1);
371 }
372
373 static void *name_block(struct mdesc_hdr *mdesc)
374 {
375 return ((void *) node_block(mdesc)) + mdesc->node_sz;
376 }
377
378 static void *data_block(struct mdesc_hdr *mdesc)
379 {
380 return ((void *) name_block(mdesc)) + mdesc->name_sz;
381 }
382
383 u64 mdesc_node_by_name(struct mdesc_handle *hp,
384 u64 from_node, const char *name)
385 {
386 struct mdesc_elem *ep = node_block(&hp->mdesc);
387 const char *names = name_block(&hp->mdesc);
388 u64 last_node = hp->mdesc.node_sz / 16;
389 u64 ret;
390
391 if (from_node == MDESC_NODE_NULL) {
392 ret = from_node = 0;
393 } else if (from_node >= last_node) {
394 return MDESC_NODE_NULL;
395 } else {
396 ret = ep[from_node].d.val;
397 }
398
399 while (ret < last_node) {
400 if (ep[ret].tag != MD_NODE)
401 return MDESC_NODE_NULL;
402 if (!strcmp(names + ep[ret].name_offset, name))
403 break;
404 ret = ep[ret].d.val;
405 }
406 if (ret >= last_node)
407 ret = MDESC_NODE_NULL;
408 return ret;
409 }
410 EXPORT_SYMBOL(mdesc_node_by_name);
411
412 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
413 const char *name, int *lenp)
414 {
415 const char *names = name_block(&hp->mdesc);
416 u64 last_node = hp->mdesc.node_sz / 16;
417 void *data = data_block(&hp->mdesc);
418 struct mdesc_elem *ep;
419
420 if (node == MDESC_NODE_NULL || node >= last_node)
421 return NULL;
422
423 ep = node_block(&hp->mdesc) + node;
424 ep++;
425 for (; ep->tag != MD_NODE_END; ep++) {
426 void *val = NULL;
427 int len = 0;
428
429 switch (ep->tag) {
430 case MD_PROP_VAL:
431 val = &ep->d.val;
432 len = 8;
433 break;
434
435 case MD_PROP_STR:
436 case MD_PROP_DATA:
437 val = data + ep->d.data.data_offset;
438 len = ep->d.data.data_len;
439 break;
440
441 default:
442 break;
443 }
444 if (!val)
445 continue;
446
447 if (!strcmp(names + ep->name_offset, name)) {
448 if (lenp)
449 *lenp = len;
450 return val;
451 }
452 }
453
454 return NULL;
455 }
456 EXPORT_SYMBOL(mdesc_get_property);
457
458 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
459 {
460 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
461 const char *names = name_block(&hp->mdesc);
462 u64 last_node = hp->mdesc.node_sz / 16;
463
464 if (from == MDESC_NODE_NULL || from >= last_node)
465 return MDESC_NODE_NULL;
466
467 ep = base + from;
468
469 ep++;
470 for (; ep->tag != MD_NODE_END; ep++) {
471 if (ep->tag != MD_PROP_ARC)
472 continue;
473
474 if (strcmp(names + ep->name_offset, arc_type))
475 continue;
476
477 return ep - base;
478 }
479
480 return MDESC_NODE_NULL;
481 }
482 EXPORT_SYMBOL(mdesc_next_arc);
483
484 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
485 {
486 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
487
488 ep = base + arc;
489
490 return ep->d.val;
491 }
492 EXPORT_SYMBOL(mdesc_arc_target);
493
494 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
495 {
496 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
497 const char *names = name_block(&hp->mdesc);
498 u64 last_node = hp->mdesc.node_sz / 16;
499
500 if (node == MDESC_NODE_NULL || node >= last_node)
501 return NULL;
502
503 ep = base + node;
504 if (ep->tag != MD_NODE)
505 return NULL;
506
507 return names + ep->name_offset;
508 }
509 EXPORT_SYMBOL(mdesc_node_name);
510
511 static void __init report_platform_properties(void)
512 {
513 struct mdesc_handle *hp = mdesc_grab();
514 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
515 const char *s;
516 const u64 *v;
517
518 if (pn == MDESC_NODE_NULL) {
519 prom_printf("No platform node in machine-description.\n");
520 prom_halt();
521 }
522
523 s = mdesc_get_property(hp, pn, "banner-name", NULL);
524 printk("PLATFORM: banner-name [%s]\n", s);
525 s = mdesc_get_property(hp, pn, "name", NULL);
526 printk("PLATFORM: name [%s]\n", s);
527
528 v = mdesc_get_property(hp, pn, "hostid", NULL);
529 if (v)
530 printk("PLATFORM: hostid [%08llx]\n", *v);
531 v = mdesc_get_property(hp, pn, "serial#", NULL);
532 if (v)
533 printk("PLATFORM: serial# [%08llx]\n", *v);
534 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
535 printk("PLATFORM: stick-frequency [%08llx]\n", *v);
536 v = mdesc_get_property(hp, pn, "mac-address", NULL);
537 if (v)
538 printk("PLATFORM: mac-address [%llx]\n", *v);
539 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
540 if (v)
541 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
542 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
543 if (v)
544 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
545 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
546 if (v)
547 printk("PLATFORM: max-cpus [%llu]\n", *v);
548
549 #ifdef CONFIG_SMP
550 {
551 int max_cpu, i;
552
553 if (v) {
554 max_cpu = *v;
555 if (max_cpu > NR_CPUS)
556 max_cpu = NR_CPUS;
557 } else {
558 max_cpu = NR_CPUS;
559 }
560 for (i = 0; i < max_cpu; i++)
561 set_cpu_possible(i, true);
562 }
563 #endif
564
565 mdesc_release(hp);
566 }
567
568 static void __cpuinit fill_in_one_cache(cpuinfo_sparc *c,
569 struct mdesc_handle *hp,
570 u64 mp)
571 {
572 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
573 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
574 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
575 const char *type;
576 int type_len;
577
578 type = mdesc_get_property(hp, mp, "type", &type_len);
579
580 switch (*level) {
581 case 1:
582 if (of_find_in_proplist(type, "instn", type_len)) {
583 c->icache_size = *size;
584 c->icache_line_size = *line_size;
585 } else if (of_find_in_proplist(type, "data", type_len)) {
586 c->dcache_size = *size;
587 c->dcache_line_size = *line_size;
588 }
589 break;
590
591 case 2:
592 c->ecache_size = *size;
593 c->ecache_line_size = *line_size;
594 break;
595
596 default:
597 break;
598 }
599
600 if (*level == 1) {
601 u64 a;
602
603 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
604 u64 target = mdesc_arc_target(hp, a);
605 const char *name = mdesc_node_name(hp, target);
606
607 if (!strcmp(name, "cache"))
608 fill_in_one_cache(c, hp, target);
609 }
610 }
611 }
612
613 static void __cpuinit mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
614 {
615 u64 a;
616
617 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
618 u64 t = mdesc_arc_target(hp, a);
619 const char *name;
620 const u64 *id;
621
622 name = mdesc_node_name(hp, t);
623 if (!strcmp(name, "cpu")) {
624 id = mdesc_get_property(hp, t, "id", NULL);
625 if (*id < NR_CPUS)
626 cpu_data(*id).core_id = core_id;
627 } else {
628 u64 j;
629
630 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
631 u64 n = mdesc_arc_target(hp, j);
632 const char *n_name;
633
634 n_name = mdesc_node_name(hp, n);
635 if (strcmp(n_name, "cpu"))
636 continue;
637
638 id = mdesc_get_property(hp, n, "id", NULL);
639 if (*id < NR_CPUS)
640 cpu_data(*id).core_id = core_id;
641 }
642 }
643 }
644 }
645
646 static void __cpuinit set_core_ids(struct mdesc_handle *hp)
647 {
648 int idx;
649 u64 mp;
650
651 idx = 1;
652 mdesc_for_each_node_by_name(hp, mp, "cache") {
653 const u64 *level;
654 const char *type;
655 int len;
656
657 level = mdesc_get_property(hp, mp, "level", NULL);
658 if (*level != 1)
659 continue;
660
661 type = mdesc_get_property(hp, mp, "type", &len);
662 if (!of_find_in_proplist(type, "instn", len))
663 continue;
664
665 mark_core_ids(hp, mp, idx);
666
667 idx++;
668 }
669 }
670
671 static void __cpuinit mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
672 {
673 u64 a;
674
675 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
676 u64 t = mdesc_arc_target(hp, a);
677 const char *name;
678 const u64 *id;
679
680 name = mdesc_node_name(hp, t);
681 if (strcmp(name, "cpu"))
682 continue;
683
684 id = mdesc_get_property(hp, t, "id", NULL);
685 if (*id < NR_CPUS)
686 cpu_data(*id).proc_id = proc_id;
687 }
688 }
689
690 static void __cpuinit __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
691 {
692 int idx;
693 u64 mp;
694
695 idx = 0;
696 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
697 const char *type;
698 int len;
699
700 type = mdesc_get_property(hp, mp, "type", &len);
701 if (!of_find_in_proplist(type, "int", len) &&
702 !of_find_in_proplist(type, "integer", len))
703 continue;
704
705 mark_proc_ids(hp, mp, idx);
706
707 idx++;
708 }
709 }
710
711 static void __cpuinit set_proc_ids(struct mdesc_handle *hp)
712 {
713 __set_proc_ids(hp, "exec_unit");
714 __set_proc_ids(hp, "exec-unit");
715 }
716
717 static void __cpuinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
718 unsigned char def)
719 {
720 u64 val;
721
722 if (!p)
723 goto use_default;
724 val = *p;
725
726 if (!val || val >= 64)
727 goto use_default;
728
729 *mask = ((1U << val) * 64U) - 1U;
730 return;
731
732 use_default:
733 *mask = ((1U << def) * 64U) - 1U;
734 }
735
736 static void __cpuinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
737 struct trap_per_cpu *tb)
738 {
739 const u64 *val;
740
741 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
742 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7);
743
744 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
745 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7);
746
747 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
748 get_one_mondo_bits(val, &tb->resum_qmask, 6);
749
750 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
751 get_one_mondo_bits(val, &tb->nonresum_qmask, 2);
752 }
753
754 static void * __cpuinit mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
755 {
756 struct mdesc_handle *hp = mdesc_grab();
757 void *ret = NULL;
758 u64 mp;
759
760 mdesc_for_each_node_by_name(hp, mp, "cpu") {
761 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
762 int cpuid = *id;
763
764 #ifdef CONFIG_SMP
765 if (cpuid >= NR_CPUS) {
766 printk(KERN_WARNING "Ignoring CPU %d which is "
767 ">= NR_CPUS (%d)\n",
768 cpuid, NR_CPUS);
769 continue;
770 }
771 if (!cpumask_test_cpu(cpuid, mask))
772 continue;
773 #endif
774
775 ret = func(hp, mp, cpuid, arg);
776 if (ret)
777 goto out;
778 }
779 out:
780 mdesc_release(hp);
781 return ret;
782 }
783
784 static void * __cpuinit record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
785 {
786 ncpus_probed++;
787 #ifdef CONFIG_SMP
788 set_cpu_present(cpuid, true);
789 #endif
790 return NULL;
791 }
792
793 void __cpuinit mdesc_populate_present_mask(cpumask_t *mask)
794 {
795 if (tlb_type != hypervisor)
796 return;
797
798 ncpus_probed = 0;
799 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
800 }
801
802 static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
803 {
804 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
805 struct trap_per_cpu *tb;
806 cpuinfo_sparc *c;
807 u64 a;
808
809 #ifndef CONFIG_SMP
810 /* On uniprocessor we only want the values for the
811 * real physical cpu the kernel booted onto, however
812 * cpu_data() only has one entry at index 0.
813 */
814 if (cpuid != real_hard_smp_processor_id())
815 return NULL;
816 cpuid = 0;
817 #endif
818
819 c = &cpu_data(cpuid);
820 c->clock_tick = *cfreq;
821
822 tb = &trap_block[cpuid];
823 get_mondo_data(hp, mp, tb);
824
825 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
826 u64 j, t = mdesc_arc_target(hp, a);
827 const char *t_name;
828
829 t_name = mdesc_node_name(hp, t);
830 if (!strcmp(t_name, "cache")) {
831 fill_in_one_cache(c, hp, t);
832 continue;
833 }
834
835 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
836 u64 n = mdesc_arc_target(hp, j);
837 const char *n_name;
838
839 n_name = mdesc_node_name(hp, n);
840 if (!strcmp(n_name, "cache"))
841 fill_in_one_cache(c, hp, n);
842 }
843 }
844
845 c->core_id = 0;
846 c->proc_id = -1;
847
848 return NULL;
849 }
850
851 void __cpuinit mdesc_fill_in_cpu_data(cpumask_t *mask)
852 {
853 struct mdesc_handle *hp;
854
855 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
856
857 #ifdef CONFIG_SMP
858 sparc64_multi_core = 1;
859 #endif
860
861 hp = mdesc_grab();
862
863 set_core_ids(hp);
864 set_proc_ids(hp);
865
866 mdesc_release(hp);
867
868 smp_fill_in_sib_core_maps();
869 }
870
871 static ssize_t mdesc_read(struct file *file, char __user *buf,
872 size_t len, loff_t *offp)
873 {
874 struct mdesc_handle *hp = mdesc_grab();
875 int err;
876
877 if (!hp)
878 return -ENODEV;
879
880 err = hp->handle_size;
881 if (len < hp->handle_size)
882 err = -EMSGSIZE;
883 else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
884 err = -EFAULT;
885 mdesc_release(hp);
886
887 return err;
888 }
889
890 static const struct file_operations mdesc_fops = {
891 .read = mdesc_read,
892 .owner = THIS_MODULE,
893 .llseek = noop_llseek,
894 };
895
896 static struct miscdevice mdesc_misc = {
897 .minor = MISC_DYNAMIC_MINOR,
898 .name = "mdesc",
899 .fops = &mdesc_fops,
900 };
901
902 static int __init mdesc_misc_init(void)
903 {
904 return misc_register(&mdesc_misc);
905 }
906
907 __initcall(mdesc_misc_init);
908
909 void __init sun4v_mdesc_init(void)
910 {
911 struct mdesc_handle *hp;
912 unsigned long len, real_len, status;
913
914 (void) sun4v_mach_desc(0UL, 0UL, &len);
915
916 printk("MDESC: Size is %lu bytes.\n", len);
917
918 hp = mdesc_alloc(len, &memblock_mdesc_ops);
919 if (hp == NULL) {
920 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
921 prom_halt();
922 }
923
924 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
925 if (status != HV_EOK || real_len > len) {
926 prom_printf("sun4v_mach_desc fails, err(%lu), "
927 "len(%lu), real_len(%lu)\n",
928 status, len, real_len);
929 mdesc_free(hp);
930 prom_halt();
931 }
932
933 cur_mdesc = hp;
934
935 report_platform_properties();
936 }
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