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sparc32: Fix exit flag passed from traced sys_sigreturn
[linux-2.6/btrfs-unstable.git] / arch / sparc / kernel / mdesc.c
blobb90bf23e3aabf36950c03383afe215a8af6006ee
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 #include <linux/export.h>
15
16 #include <asm/cpudata.h>
17 #include <asm/hypervisor.h>
18 #include <asm/mdesc.h>
19 #include <asm/prom.h>
20 #include <asm/uaccess.h>
21 #include <asm/oplib.h>
22 #include <asm/smp.h>
23
24 /* Unlike the OBP device tree, the machine description is a full-on
25 * DAG. An arbitrary number of ARCs are possible from one
26 * node to other nodes and thus we can't use the OBP device_node
27 * data structure to represent these nodes inside of the kernel.
28 *
29 * Actually, it isn't even a DAG, because there are back pointers
30 * which create cycles in the graph.
31 *
32 * mdesc_hdr and mdesc_elem describe the layout of the data structure
33 * we get from the Hypervisor.
34 */
35 struct mdesc_hdr {
36 u32 version; /* Transport version */
37 u32 node_sz; /* node block size */
38 u32 name_sz; /* name block size */
39 u32 data_sz; /* data block size */
40 } __attribute__((aligned(16)));
41
42 struct mdesc_elem {
43 u8 tag;
44 #define MD_LIST_END 0x00
45 #define MD_NODE 0x4e
46 #define MD_NODE_END 0x45
47 #define MD_NOOP 0x20
48 #define MD_PROP_ARC 0x61
49 #define MD_PROP_VAL 0x76
50 #define MD_PROP_STR 0x73
51 #define MD_PROP_DATA 0x64
52 u8 name_len;
53 u16 resv;
54 u32 name_offset;
55 union {
56 struct {
57 u32 data_len;
58 u32 data_offset;
59 } data;
60 u64 val;
61 } d;
62 };
63
64 struct mdesc_mem_ops {
65 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
66 void (*free)(struct mdesc_handle *handle);
67 };
68
69 struct mdesc_handle {
70 struct list_head list;
71 struct mdesc_mem_ops *mops;
72 void *self_base;
73 atomic_t refcnt;
74 unsigned int handle_size;
75 struct mdesc_hdr mdesc;
76 };
77
78 static void mdesc_handle_init(struct mdesc_handle *hp,
79 unsigned int handle_size,
80 void *base)
81 {
82 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
83
84 memset(hp, 0, handle_size);
85 INIT_LIST_HEAD(&hp->list);
86 hp->self_base = base;
87 atomic_set(&hp->refcnt, 1);
88 hp->handle_size = handle_size;
89 }
90
91 static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
92 {
93 unsigned int handle_size, alloc_size;
94 struct mdesc_handle *hp;
95 unsigned long paddr;
96
97 handle_size = (sizeof(struct mdesc_handle) -
98 sizeof(struct mdesc_hdr) +
99 mdesc_size);
100 alloc_size = PAGE_ALIGN(handle_size);
101
102 paddr = memblock_alloc(alloc_size, PAGE_SIZE);
103
104 hp = NULL;
105 if (paddr) {
106 hp = __va(paddr);
107 mdesc_handle_init(hp, handle_size, hp);
108 }
109 return hp;
110 }
111
112 static void __init mdesc_memblock_free(struct mdesc_handle *hp)
113 {
114 unsigned int alloc_size;
115 unsigned long start;
116
117 BUG_ON(atomic_read(&hp->refcnt) != 0);
118 BUG_ON(!list_empty(&hp->list));
119
120 alloc_size = PAGE_ALIGN(hp->handle_size);
121 start = __pa(hp);
122 free_bootmem_late(start, alloc_size);
123 }
124
125 static struct mdesc_mem_ops memblock_mdesc_ops = {
126 .alloc = mdesc_memblock_alloc,
127 .free = mdesc_memblock_free,
128 };
129
130 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
131 {
132 unsigned int handle_size;
133 void *base;
134
135 handle_size = (sizeof(struct mdesc_handle) -
136 sizeof(struct mdesc_hdr) +
137 mdesc_size);
138
139 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
140 if (base) {
141 struct mdesc_handle *hp;
142 unsigned long addr;
143
144 addr = (unsigned long)base;
145 addr = (addr + 15UL) & ~15UL;
146 hp = (struct mdesc_handle *) addr;
147
148 mdesc_handle_init(hp, handle_size, base);
149 return hp;
150 }
151
152 return NULL;
153 }
154
155 static void mdesc_kfree(struct mdesc_handle *hp)
156 {
157 BUG_ON(atomic_read(&hp->refcnt) != 0);
158 BUG_ON(!list_empty(&hp->list));
159
160 kfree(hp->self_base);
161 }
162
163 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
164 .alloc = mdesc_kmalloc,
165 .free = mdesc_kfree,
166 };
167
168 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
169 struct mdesc_mem_ops *mops)
170 {
171 struct mdesc_handle *hp = mops->alloc(mdesc_size);
172
173 if (hp)
174 hp->mops = mops;
175
176 return hp;
177 }
178
179 static void mdesc_free(struct mdesc_handle *hp)
180 {
181 hp->mops->free(hp);
182 }
183
184 static struct mdesc_handle *cur_mdesc;
185 static LIST_HEAD(mdesc_zombie_list);
186 static DEFINE_SPINLOCK(mdesc_lock);
187
188 struct mdesc_handle *mdesc_grab(void)
189 {
190 struct mdesc_handle *hp;
191 unsigned long flags;
192
193 spin_lock_irqsave(&mdesc_lock, flags);
194 hp = cur_mdesc;
195 if (hp)
196 atomic_inc(&hp->refcnt);
197 spin_unlock_irqrestore(&mdesc_lock, flags);
198
199 return hp;
200 }
201 EXPORT_SYMBOL(mdesc_grab);
202
203 void mdesc_release(struct mdesc_handle *hp)
204 {
205 unsigned long flags;
206
207 spin_lock_irqsave(&mdesc_lock, flags);
208 if (atomic_dec_and_test(&hp->refcnt)) {
209 list_del_init(&hp->list);
210 hp->mops->free(hp);
211 }
212 spin_unlock_irqrestore(&mdesc_lock, flags);
213 }
214 EXPORT_SYMBOL(mdesc_release);
215
216 static DEFINE_MUTEX(mdesc_mutex);
217 static struct mdesc_notifier_client *client_list;
218
219 void mdesc_register_notifier(struct mdesc_notifier_client *client)
220 {
221 u64 node;
222
223 mutex_lock(&mdesc_mutex);
224 client->next = client_list;
225 client_list = client;
226
227 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
228 client->add(cur_mdesc, node);
229
230 mutex_unlock(&mdesc_mutex);
231 }
232
233 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
234 {
235 const u64 *id;
236 u64 a;
237
238 id = NULL;
239 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
240 u64 target;
241
242 target = mdesc_arc_target(hp, a);
243 id = mdesc_get_property(hp, target,
244 "cfg-handle", NULL);
245 if (id)
246 break;
247 }
248
249 return id;
250 }
251
252 /* Run 'func' on nodes which are in A but not in B. */
253 static void invoke_on_missing(const char *name,
254 struct mdesc_handle *a,
255 struct mdesc_handle *b,
256 void (*func)(struct mdesc_handle *, u64))
257 {
258 u64 node;
259
260 mdesc_for_each_node_by_name(a, node, name) {
261 int found = 0, is_vdc_port = 0;
262 const char *name_prop;
263 const u64 *id;
264 u64 fnode;
265
266 name_prop = mdesc_get_property(a, node, "name", NULL);
267 if (name_prop && !strcmp(name_prop, "vdc-port")) {
268 is_vdc_port = 1;
269 id = parent_cfg_handle(a, node);
270 } else
271 id = mdesc_get_property(a, node, "id", NULL);
272
273 if (!id) {
274 printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
275 (name_prop ? name_prop : name));
276 continue;
277 }
278
279 mdesc_for_each_node_by_name(b, fnode, name) {
280 const u64 *fid;
281
282 if (is_vdc_port) {
283 name_prop = mdesc_get_property(b, fnode,
284 "name", NULL);
285 if (!name_prop ||
286 strcmp(name_prop, "vdc-port"))
287 continue;
288 fid = parent_cfg_handle(b, fnode);
289 if (!fid) {
290 printk(KERN_ERR "MD: Cannot find ID "
291 "for vdc-port node.\n");
292 continue;
293 }
294 } else
295 fid = mdesc_get_property(b, fnode,
296 "id", NULL);
297
298 if (*id == *fid) {
299 found = 1;
300 break;
301 }
302 }
303 if (!found)
304 func(a, node);
305 }
306 }
307
308 static void notify_one(struct mdesc_notifier_client *p,
309 struct mdesc_handle *old_hp,
310 struct mdesc_handle *new_hp)
311 {
312 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
313 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
314 }
315
316 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
317 struct mdesc_handle *new_hp)
318 {
319 struct mdesc_notifier_client *p = client_list;
320
321 while (p) {
322 notify_one(p, old_hp, new_hp);
323 p = p->next;
324 }
325 }
326
327 void mdesc_update(void)
328 {
329 unsigned long len, real_len, status;
330 struct mdesc_handle *hp, *orig_hp;
331 unsigned long flags;
332
333 mutex_lock(&mdesc_mutex);
334
335 (void) sun4v_mach_desc(0UL, 0UL, &len);
336
337 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
338 if (!hp) {
339 printk(KERN_ERR "MD: mdesc alloc fails\n");
340 goto out;
341 }
342
343 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
344 if (status != HV_EOK || real_len > len) {
345 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
346 status);
347 atomic_dec(&hp->refcnt);
348 mdesc_free(hp);
349 goto out;
350 }
351
352 spin_lock_irqsave(&mdesc_lock, flags);
353 orig_hp = cur_mdesc;
354 cur_mdesc = hp;
355 spin_unlock_irqrestore(&mdesc_lock, flags);
356
357 mdesc_notify_clients(orig_hp, hp);
358
359 spin_lock_irqsave(&mdesc_lock, flags);
360 if (atomic_dec_and_test(&orig_hp->refcnt))
361 mdesc_free(orig_hp);
362 else
363 list_add(&orig_hp->list, &mdesc_zombie_list);
364 spin_unlock_irqrestore(&mdesc_lock, flags);
365
366 out:
367 mutex_unlock(&mdesc_mutex);
368 }
369
370 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
371 {
372 return (struct mdesc_elem *) (mdesc + 1);
373 }
374
375 static void *name_block(struct mdesc_hdr *mdesc)
376 {
377 return ((void *) node_block(mdesc)) + mdesc->node_sz;
378 }
379
380 static void *data_block(struct mdesc_hdr *mdesc)
381 {
382 return ((void *) name_block(mdesc)) + mdesc->name_sz;
383 }
384
385 u64 mdesc_node_by_name(struct mdesc_handle *hp,
386 u64 from_node, const char *name)
387 {
388 struct mdesc_elem *ep = node_block(&hp->mdesc);
389 const char *names = name_block(&hp->mdesc);
390 u64 last_node = hp->mdesc.node_sz / 16;
391 u64 ret;
392
393 if (from_node == MDESC_NODE_NULL) {
394 ret = from_node = 0;
395 } else if (from_node >= last_node) {
396 return MDESC_NODE_NULL;
397 } else {
398 ret = ep[from_node].d.val;
399 }
400
401 while (ret < last_node) {
402 if (ep[ret].tag != MD_NODE)
403 return MDESC_NODE_NULL;
404 if (!strcmp(names + ep[ret].name_offset, name))
405 break;
406 ret = ep[ret].d.val;
407 }
408 if (ret >= last_node)
409 ret = MDESC_NODE_NULL;
410 return ret;
411 }
412 EXPORT_SYMBOL(mdesc_node_by_name);
413
414 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
415 const char *name, int *lenp)
416 {
417 const char *names = name_block(&hp->mdesc);
418 u64 last_node = hp->mdesc.node_sz / 16;
419 void *data = data_block(&hp->mdesc);
420 struct mdesc_elem *ep;
421
422 if (node == MDESC_NODE_NULL || node >= last_node)
423 return NULL;
424
425 ep = node_block(&hp->mdesc) + node;
426 ep++;
427 for (; ep->tag != MD_NODE_END; ep++) {
428 void *val = NULL;
429 int len = 0;
430
431 switch (ep->tag) {
432 case MD_PROP_VAL:
433 val = &ep->d.val;
434 len = 8;
435 break;
436
437 case MD_PROP_STR:
438 case MD_PROP_DATA:
439 val = data + ep->d.data.data_offset;
440 len = ep->d.data.data_len;
441 break;
442
443 default:
444 break;
445 }
446 if (!val)
447 continue;
448
449 if (!strcmp(names + ep->name_offset, name)) {
450 if (lenp)
451 *lenp = len;
452 return val;
453 }
454 }
455
456 return NULL;
457 }
458 EXPORT_SYMBOL(mdesc_get_property);
459
460 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
461 {
462 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
463 const char *names = name_block(&hp->mdesc);
464 u64 last_node = hp->mdesc.node_sz / 16;
465
466 if (from == MDESC_NODE_NULL || from >= last_node)
467 return MDESC_NODE_NULL;
468
469 ep = base + from;
470
471 ep++;
472 for (; ep->tag != MD_NODE_END; ep++) {
473 if (ep->tag != MD_PROP_ARC)
474 continue;
475
476 if (strcmp(names + ep->name_offset, arc_type))
477 continue;
478
479 return ep - base;
480 }
481
482 return MDESC_NODE_NULL;
483 }
484 EXPORT_SYMBOL(mdesc_next_arc);
485
486 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
487 {
488 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
489
490 ep = base + arc;
491
492 return ep->d.val;
493 }
494 EXPORT_SYMBOL(mdesc_arc_target);
495
496 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
497 {
498 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
499 const char *names = name_block(&hp->mdesc);
500 u64 last_node = hp->mdesc.node_sz / 16;
501
502 if (node == MDESC_NODE_NULL || node >= last_node)
503 return NULL;
504
505 ep = base + node;
506 if (ep->tag != MD_NODE)
507 return NULL;
508
509 return names + ep->name_offset;
510 }
511 EXPORT_SYMBOL(mdesc_node_name);
512
513 static u64 max_cpus = 64;
514
515 static void __init report_platform_properties(void)
516 {
517 struct mdesc_handle *hp = mdesc_grab();
518 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
519 const char *s;
520 const u64 *v;
521
522 if (pn == MDESC_NODE_NULL) {
523 prom_printf("No platform node in machine-description.\n");
524 prom_halt();
525 }
526
527 s = mdesc_get_property(hp, pn, "banner-name", NULL);
528 printk("PLATFORM: banner-name [%s]\n", s);
529 s = mdesc_get_property(hp, pn, "name", NULL);
530 printk("PLATFORM: name [%s]\n", s);
531
532 v = mdesc_get_property(hp, pn, "hostid", NULL);
533 if (v)
534 printk("PLATFORM: hostid [%08llx]\n", *v);
535 v = mdesc_get_property(hp, pn, "serial#", NULL);
536 if (v)
537 printk("PLATFORM: serial# [%08llx]\n", *v);
538 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
539 printk("PLATFORM: stick-frequency [%08llx]\n", *v);
540 v = mdesc_get_property(hp, pn, "mac-address", NULL);
541 if (v)
542 printk("PLATFORM: mac-address [%llx]\n", *v);
543 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
544 if (v)
545 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
546 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
547 if (v)
548 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
549 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
550 if (v) {
551 max_cpus = *v;
552 printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
553 }
554
555 #ifdef CONFIG_SMP
556 {
557 int max_cpu, i;
558
559 if (v) {
560 max_cpu = *v;
561 if (max_cpu > NR_CPUS)
562 max_cpu = NR_CPUS;
563 } else {
564 max_cpu = NR_CPUS;
565 }
566 for (i = 0; i < max_cpu; i++)
567 set_cpu_possible(i, true);
568 }
569 #endif
570
571 mdesc_release(hp);
572 }
573
574 static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp)
575 {
576 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
577 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
578 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
579 const char *type;
580 int type_len;
581
582 type = mdesc_get_property(hp, mp, "type", &type_len);
583
584 switch (*level) {
585 case 1:
586 if (of_find_in_proplist(type, "instn", type_len)) {
587 c->icache_size = *size;
588 c->icache_line_size = *line_size;
589 } else if (of_find_in_proplist(type, "data", type_len)) {
590 c->dcache_size = *size;
591 c->dcache_line_size = *line_size;
592 }
593 break;
594
595 case 2:
596 c->ecache_size = *size;
597 c->ecache_line_size = *line_size;
598 break;
599
600 default:
601 break;
602 }
603
604 if (*level == 1) {
605 u64 a;
606
607 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
608 u64 target = mdesc_arc_target(hp, a);
609 const char *name = mdesc_node_name(hp, target);
610
611 if (!strcmp(name, "cache"))
612 fill_in_one_cache(c, hp, target);
613 }
614 }
615 }
616
617 static void mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
618 {
619 u64 a;
620
621 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
622 u64 t = mdesc_arc_target(hp, a);
623 const char *name;
624 const u64 *id;
625
626 name = mdesc_node_name(hp, t);
627 if (!strcmp(name, "cpu")) {
628 id = mdesc_get_property(hp, t, "id", NULL);
629 if (*id < NR_CPUS)
630 cpu_data(*id).core_id = core_id;
631 } else {
632 u64 j;
633
634 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
635 u64 n = mdesc_arc_target(hp, j);
636 const char *n_name;
637
638 n_name = mdesc_node_name(hp, n);
639 if (strcmp(n_name, "cpu"))
640 continue;
641
642 id = mdesc_get_property(hp, n, "id", NULL);
643 if (*id < NR_CPUS)
644 cpu_data(*id).core_id = core_id;
645 }
646 }
647 }
648 }
649
650 static void set_core_ids(struct mdesc_handle *hp)
651 {
652 int idx;
653 u64 mp;
654
655 idx = 1;
656 mdesc_for_each_node_by_name(hp, mp, "cache") {
657 const u64 *level;
658 const char *type;
659 int len;
660
661 level = mdesc_get_property(hp, mp, "level", NULL);
662 if (*level != 1)
663 continue;
664
665 type = mdesc_get_property(hp, mp, "type", &len);
666 if (!of_find_in_proplist(type, "instn", len))
667 continue;
668
669 mark_core_ids(hp, mp, idx);
670
671 idx++;
672 }
673 }
674
675 static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
676 {
677 u64 a;
678
679 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
680 u64 t = mdesc_arc_target(hp, a);
681 const char *name;
682 const u64 *id;
683
684 name = mdesc_node_name(hp, t);
685 if (strcmp(name, "cpu"))
686 continue;
687
688 id = mdesc_get_property(hp, t, "id", NULL);
689 if (*id < NR_CPUS)
690 cpu_data(*id).proc_id = proc_id;
691 }
692 }
693
694 static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
695 {
696 int idx;
697 u64 mp;
698
699 idx = 0;
700 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
701 const char *type;
702 int len;
703
704 type = mdesc_get_property(hp, mp, "type", &len);
705 if (!of_find_in_proplist(type, "int", len) &&
706 !of_find_in_proplist(type, "integer", len))
707 continue;
708
709 mark_proc_ids(hp, mp, idx);
710
711 idx++;
712 }
713 }
714
715 static void set_proc_ids(struct mdesc_handle *hp)
716 {
717 __set_proc_ids(hp, "exec_unit");
718 __set_proc_ids(hp, "exec-unit");
719 }
720
721 static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
722 unsigned long def, unsigned long max)
723 {
724 u64 val;
725
726 if (!p)
727 goto use_default;
728 val = *p;
729
730 if (!val || val >= 64)
731 goto use_default;
732
733 if (val > max)
734 val = max;
735
736 *mask = ((1U << val) * 64U) - 1U;
737 return;
738
739 use_default:
740 *mask = ((1U << def) * 64U) - 1U;
741 }
742
743 static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
744 struct trap_per_cpu *tb)
745 {
746 static int printed;
747 const u64 *val;
748
749 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
750 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
751
752 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
753 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
754
755 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
756 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
757
758 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
759 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
760 if (!printed++) {
761 pr_info("SUN4V: Mondo queue sizes "
762 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
763 tb->cpu_mondo_qmask + 1,
764 tb->dev_mondo_qmask + 1,
765 tb->resum_qmask + 1,
766 tb->nonresum_qmask + 1);
767 }
768 }
769
770 static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
771 {
772 struct mdesc_handle *hp = mdesc_grab();
773 void *ret = NULL;
774 u64 mp;
775
776 mdesc_for_each_node_by_name(hp, mp, "cpu") {
777 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
778 int cpuid = *id;
779
780 #ifdef CONFIG_SMP
781 if (cpuid >= NR_CPUS) {
782 printk(KERN_WARNING "Ignoring CPU %d which is "
783 ">= NR_CPUS (%d)\n",
784 cpuid, NR_CPUS);
785 continue;
786 }
787 if (!cpumask_test_cpu(cpuid, mask))
788 continue;
789 #endif
790
791 ret = func(hp, mp, cpuid, arg);
792 if (ret)
793 goto out;
794 }
795 out:
796 mdesc_release(hp);
797 return ret;
798 }
799
800 static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
801 void *arg)
802 {
803 ncpus_probed++;
804 #ifdef CONFIG_SMP
805 set_cpu_present(cpuid, true);
806 #endif
807 return NULL;
808 }
809
810 void mdesc_populate_present_mask(cpumask_t *mask)
811 {
812 if (tlb_type != hypervisor)
813 return;
814
815 ncpus_probed = 0;
816 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
817 }
818
819 static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
820 {
821 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
822 unsigned long *pgsz_mask = arg;
823 u64 val;
824
825 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
826 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
827 if (pgsz_prop)
828 val = *pgsz_prop;
829
830 if (!*pgsz_mask)
831 *pgsz_mask = val;
832 else
833 *pgsz_mask &= val;
834 return NULL;
835 }
836
837 void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
838 {
839 *pgsz_mask = 0;
840 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
841 }
842
843 static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
844 void *arg)
845 {
846 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
847 struct trap_per_cpu *tb;
848 cpuinfo_sparc *c;
849 u64 a;
850
851 #ifndef CONFIG_SMP
852 /* On uniprocessor we only want the values for the
853 * real physical cpu the kernel booted onto, however
854 * cpu_data() only has one entry at index 0.
855 */
856 if (cpuid != real_hard_smp_processor_id())
857 return NULL;
858 cpuid = 0;
859 #endif
860
861 c = &cpu_data(cpuid);
862 c->clock_tick = *cfreq;
863
864 tb = &trap_block[cpuid];
865 get_mondo_data(hp, mp, tb);
866
867 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
868 u64 j, t = mdesc_arc_target(hp, a);
869 const char *t_name;
870
871 t_name = mdesc_node_name(hp, t);
872 if (!strcmp(t_name, "cache")) {
873 fill_in_one_cache(c, hp, t);
874 continue;
875 }
876
877 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
878 u64 n = mdesc_arc_target(hp, j);
879 const char *n_name;
880
881 n_name = mdesc_node_name(hp, n);
882 if (!strcmp(n_name, "cache"))
883 fill_in_one_cache(c, hp, n);
884 }
885 }
886
887 c->core_id = 0;
888 c->proc_id = -1;
889
890 return NULL;
891 }
892
893 void mdesc_fill_in_cpu_data(cpumask_t *mask)
894 {
895 struct mdesc_handle *hp;
896
897 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
898
899 #ifdef CONFIG_SMP
900 sparc64_multi_core = 1;
901 #endif
902
903 hp = mdesc_grab();
904
905 set_core_ids(hp);
906 set_proc_ids(hp);
907
908 mdesc_release(hp);
909
910 smp_fill_in_sib_core_maps();
911 }
912
913 static ssize_t mdesc_read(struct file *file, char __user *buf,
914 size_t len, loff_t *offp)
915 {
916 struct mdesc_handle *hp = mdesc_grab();
917 int err;
918
919 if (!hp)
920 return -ENODEV;
921
922 err = hp->handle_size;
923 if (len < hp->handle_size)
924 err = -EMSGSIZE;
925 else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
926 err = -EFAULT;
927 mdesc_release(hp);
928
929 return err;
930 }
931
932 static const struct file_operations mdesc_fops = {
933 .read = mdesc_read,
934 .owner = THIS_MODULE,
935 .llseek = noop_llseek,
936 };
937
938 static struct miscdevice mdesc_misc = {
939 .minor = MISC_DYNAMIC_MINOR,
940 .name = "mdesc",
941 .fops = &mdesc_fops,
942 };
943
944 static int __init mdesc_misc_init(void)
945 {
946 return misc_register(&mdesc_misc);
947 }
948
949 __initcall(mdesc_misc_init);
950
951 void __init sun4v_mdesc_init(void)
952 {
953 struct mdesc_handle *hp;
954 unsigned long len, real_len, status;
955
956 (void) sun4v_mach_desc(0UL, 0UL, &len);
957
958 printk("MDESC: Size is %lu bytes.\n", len);
959
960 hp = mdesc_alloc(len, &memblock_mdesc_ops);
961 if (hp == NULL) {
962 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
963 prom_halt();
964 }
965
966 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
967 if (status != HV_EOK || real_len > len) {
968 prom_printf("sun4v_mach_desc fails, err(%lu), "
969 "len(%lu), real_len(%lu)\n",
970 status, len, real_len);
971 mdesc_free(hp);
972 prom_halt();
973 }
974
975 cur_mdesc = hp;
976
977 report_platform_properties();
978 }
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