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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 */
35struct 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
42struct 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
64struct mdesc_mem_ops {
65 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
66 void (*free)(struct mdesc_handle *handle);
67};
68
69struct 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
78static 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
91static 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
112static 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
125static struct mdesc_mem_ops memblock_mdesc_ops = {
126 .alloc = mdesc_memblock_alloc,
127 .free = mdesc_memblock_free,
128};
129
130static 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
155static 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
163static struct mdesc_mem_ops kmalloc_mdesc_memops = {
164 .alloc = mdesc_kmalloc,
165 .free = mdesc_kfree,
166};
167
168static 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
179static void mdesc_free(struct mdesc_handle *hp)
180{
181 hp->mops->free(hp);
182}
183
184static struct mdesc_handle *cur_mdesc;
185static LIST_HEAD(mdesc_zombie_list);
186static DEFINE_SPINLOCK(mdesc_lock);
187
188struct 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}
201EXPORT_SYMBOL(mdesc_grab);
202
203void 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}
214EXPORT_SYMBOL(mdesc_release);
215
216static DEFINE_MUTEX(mdesc_mutex);
217static struct mdesc_notifier_client *client_list;
218
219void 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
233static 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. */
253static 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
308static 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
316static 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
327void 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
366out:
367 mutex_unlock(&mdesc_mutex);
368}
369
370static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
371{
372 return (struct mdesc_elem *) (mdesc + 1);
373}
374
375static void *name_block(struct mdesc_hdr *mdesc)
376{
377 return ((void *) node_block(mdesc)) + mdesc->node_sz;
378}
379
380static void *data_block(struct mdesc_hdr *mdesc)
381{
382 return ((void *) name_block(mdesc)) + mdesc->name_sz;
383}
384
385u64 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}
412EXPORT_SYMBOL(mdesc_node_by_name);
413
414const 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}
458EXPORT_SYMBOL(mdesc_get_property);
459
460u64 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}
484EXPORT_SYMBOL(mdesc_next_arc);
485
486u64 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}
494EXPORT_SYMBOL(mdesc_arc_target);
495
496const 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}
511EXPORT_SYMBOL(mdesc_node_name);
512
513static u64 max_cpus = 64;
514
515static 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
574static void __cpuinit fill_in_one_cache(cpuinfo_sparc *c,
575 struct mdesc_handle *hp,
576 u64 mp)
577{
578 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
579 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
580 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
581 const char *type;
582 int type_len;
583
584 type = mdesc_get_property(hp, mp, "type", &type_len);
585
586 switch (*level) {
587 case 1:
588 if (of_find_in_proplist(type, "instn", type_len)) {
589 c->icache_size = *size;
590 c->icache_line_size = *line_size;
591 } else if (of_find_in_proplist(type, "data", type_len)) {
592 c->dcache_size = *size;
593 c->dcache_line_size = *line_size;
594 }
595 break;
596
597 case 2:
598 c->ecache_size = *size;
599 c->ecache_line_size = *line_size;
600 break;
601
602 default:
603 break;
604 }
605
606 if (*level == 1) {
607 u64 a;
608
609 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
610 u64 target = mdesc_arc_target(hp, a);
611 const char *name = mdesc_node_name(hp, target);
612
613 if (!strcmp(name, "cache"))
614 fill_in_one_cache(c, hp, target);
615 }
616 }
617}
618
619static void __cpuinit mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
620{
621 u64 a;
622
623 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
624 u64 t = mdesc_arc_target(hp, a);
625 const char *name;
626 const u64 *id;
627
628 name = mdesc_node_name(hp, t);
629 if (!strcmp(name, "cpu")) {
630 id = mdesc_get_property(hp, t, "id", NULL);
631 if (*id < NR_CPUS)
632 cpu_data(*id).core_id = core_id;
633 } else {
634 u64 j;
635
636 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
637 u64 n = mdesc_arc_target(hp, j);
638 const char *n_name;
639
640 n_name = mdesc_node_name(hp, n);
641 if (strcmp(n_name, "cpu"))
642 continue;
643
644 id = mdesc_get_property(hp, n, "id", NULL);
645 if (*id < NR_CPUS)
646 cpu_data(*id).core_id = core_id;
647 }
648 }
649 }
650}
651
652static void __cpuinit set_core_ids(struct mdesc_handle *hp)
653{
654 int idx;
655 u64 mp;
656
657 idx = 1;
658 mdesc_for_each_node_by_name(hp, mp, "cache") {
659 const u64 *level;
660 const char *type;
661 int len;
662
663 level = mdesc_get_property(hp, mp, "level", NULL);
664 if (*level != 1)
665 continue;
666
667 type = mdesc_get_property(hp, mp, "type", &len);
668 if (!of_find_in_proplist(type, "instn", len))
669 continue;
670
671 mark_core_ids(hp, mp, idx);
672
673 idx++;
674 }
675}
676
677static void __cpuinit mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
678{
679 u64 a;
680
681 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
682 u64 t = mdesc_arc_target(hp, a);
683 const char *name;
684 const u64 *id;
685
686 name = mdesc_node_name(hp, t);
687 if (strcmp(name, "cpu"))
688 continue;
689
690 id = mdesc_get_property(hp, t, "id", NULL);
691 if (*id < NR_CPUS)
692 cpu_data(*id).proc_id = proc_id;
693 }
694}
695
696static void __cpuinit __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
697{
698 int idx;
699 u64 mp;
700
701 idx = 0;
702 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
703 const char *type;
704 int len;
705
706 type = mdesc_get_property(hp, mp, "type", &len);
707 if (!of_find_in_proplist(type, "int", len) &&
708 !of_find_in_proplist(type, "integer", len))
709 continue;
710
711 mark_proc_ids(hp, mp, idx);
712
713 idx++;
714 }
715}
716
717static void __cpuinit set_proc_ids(struct mdesc_handle *hp)
718{
719 __set_proc_ids(hp, "exec_unit");
720 __set_proc_ids(hp, "exec-unit");
721}
722
723static void __cpuinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
724 unsigned long def, unsigned long max)
725{
726 u64 val;
727
728 if (!p)
729 goto use_default;
730 val = *p;
731
732 if (!val || val >= 64)
733 goto use_default;
734
735 if (val > max)
736 val = max;
737
738 *mask = ((1U << val) * 64U) - 1U;
739 return;
740
741use_default:
742 *mask = ((1U << def) * 64U) - 1U;
743}
744
745static void __cpuinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
746 struct trap_per_cpu *tb)
747{
748 static int printed;
749 const u64 *val;
750
751 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
752 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
753
754 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
755 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
756
757 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
758 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
759
760 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
761 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
762 if (!printed++) {
763 pr_info("SUN4V: Mondo queue sizes "
764 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
765 tb->cpu_mondo_qmask + 1,
766 tb->dev_mondo_qmask + 1,
767 tb->resum_qmask + 1,
768 tb->nonresum_qmask + 1);
769 }
770}
771
772static void * __cpuinit mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
773{
774 struct mdesc_handle *hp = mdesc_grab();
775 void *ret = NULL;
776 u64 mp;
777
778 mdesc_for_each_node_by_name(hp, mp, "cpu") {
779 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
780 int cpuid = *id;
781
782#ifdef CONFIG_SMP
783 if (cpuid >= NR_CPUS) {
784 printk(KERN_WARNING "Ignoring CPU %d which is "
785 ">= NR_CPUS (%d)\n",
786 cpuid, NR_CPUS);
787 continue;
788 }
789 if (!cpumask_test_cpu(cpuid, mask))
790 continue;
791#endif
792
793 ret = func(hp, mp, cpuid, arg);
794 if (ret)
795 goto out;
796 }
797out:
798 mdesc_release(hp);
799 return ret;
800}
801
802static void * __cpuinit record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
803{
804 ncpus_probed++;
805#ifdef CONFIG_SMP
806 set_cpu_present(cpuid, true);
807#endif
808 return NULL;
809}
810
811void __cpuinit mdesc_populate_present_mask(cpumask_t *mask)
812{
813 if (tlb_type != hypervisor)
814 return;
815
816 ncpus_probed = 0;
817 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
818}
819
820static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
821{
822 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
823 struct trap_per_cpu *tb;
824 cpuinfo_sparc *c;
825 u64 a;
826
827#ifndef CONFIG_SMP
828 /* On uniprocessor we only want the values for the
829 * real physical cpu the kernel booted onto, however
830 * cpu_data() only has one entry at index 0.
831 */
832 if (cpuid != real_hard_smp_processor_id())
833 return NULL;
834 cpuid = 0;
835#endif
836
837 c = &cpu_data(cpuid);
838 c->clock_tick = *cfreq;
839
840 tb = &trap_block[cpuid];
841 get_mondo_data(hp, mp, tb);
842
843 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
844 u64 j, t = mdesc_arc_target(hp, a);
845 const char *t_name;
846
847 t_name = mdesc_node_name(hp, t);
848 if (!strcmp(t_name, "cache")) {
849 fill_in_one_cache(c, hp, t);
850 continue;
851 }
852
853 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
854 u64 n = mdesc_arc_target(hp, j);
855 const char *n_name;
856
857 n_name = mdesc_node_name(hp, n);
858 if (!strcmp(n_name, "cache"))
859 fill_in_one_cache(c, hp, n);
860 }
861 }
862
863 c->core_id = 0;
864 c->proc_id = -1;
865
866 return NULL;
867}
868
869void __cpuinit mdesc_fill_in_cpu_data(cpumask_t *mask)
870{
871 struct mdesc_handle *hp;
872
873 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
874
875#ifdef CONFIG_SMP
876 sparc64_multi_core = 1;
877#endif
878
879 hp = mdesc_grab();
880
881 set_core_ids(hp);
882 set_proc_ids(hp);
883
884 mdesc_release(hp);
885
886 smp_fill_in_sib_core_maps();
887}
888
889static ssize_t mdesc_read(struct file *file, char __user *buf,
890 size_t len, loff_t *offp)
891{
892 struct mdesc_handle *hp = mdesc_grab();
893 int err;
894
895 if (!hp)
896 return -ENODEV;
897
898 err = hp->handle_size;
899 if (len < hp->handle_size)
900 err = -EMSGSIZE;
901 else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
902 err = -EFAULT;
903 mdesc_release(hp);
904
905 return err;
906}
907
908static const struct file_operations mdesc_fops = {
909 .read = mdesc_read,
910 .owner = THIS_MODULE,
911 .llseek = noop_llseek,
912};
913
914static struct miscdevice mdesc_misc = {
915 .minor = MISC_DYNAMIC_MINOR,
916 .name = "mdesc",
917 .fops = &mdesc_fops,
918};
919
920static int __init mdesc_misc_init(void)
921{
922 return misc_register(&mdesc_misc);
923}
924
925__initcall(mdesc_misc_init);
926
927void __init sun4v_mdesc_init(void)
928{
929 struct mdesc_handle *hp;
930 unsigned long len, real_len, status;
931
932 (void) sun4v_mach_desc(0UL, 0UL, &len);
933
934 printk("MDESC: Size is %lu bytes.\n", len);
935
936 hp = mdesc_alloc(len, &memblock_mdesc_ops);
937 if (hp == NULL) {
938 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
939 prom_halt();
940 }
941
942 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
943 if (status != HV_EOK || real_len > len) {
944 prom_printf("sun4v_mach_desc fails, err(%lu), "
945 "len(%lu), real_len(%lu)\n",
946 status, len, real_len);
947 mdesc_free(hp);
948 prom_halt();
949 }
950
951 cur_mdesc = hp;
952
953 report_platform_properties();
954}
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 <linux/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 */
35struct 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
42struct 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
64struct mdesc_mem_ops {
65 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
66 void (*free)(struct mdesc_handle *handle);
67};
68
69struct 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
78static 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
91static 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
112static 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
125static struct mdesc_mem_ops memblock_mdesc_ops = {
126 .alloc = mdesc_memblock_alloc,
127 .free = mdesc_memblock_free,
128};
129
130static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
131{
132 unsigned int handle_size;
133 struct mdesc_handle *hp;
134 unsigned long addr;
135 void *base;
136
137 handle_size = (sizeof(struct mdesc_handle) -
138 sizeof(struct mdesc_hdr) +
139 mdesc_size);
140
141 /*
142 * Allocation has to succeed because mdesc update would be missed
143 * and such events are not retransmitted.
144 */
145 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
146 addr = (unsigned long)base;
147 addr = (addr + 15UL) & ~15UL;
148 hp = (struct mdesc_handle *) addr;
149
150 mdesc_handle_init(hp, handle_size, base);
151
152 return hp;
153}
154
155static 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
163static struct mdesc_mem_ops kmalloc_mdesc_memops = {
164 .alloc = mdesc_kmalloc,
165 .free = mdesc_kfree,
166};
167
168static 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
179static void mdesc_free(struct mdesc_handle *hp)
180{
181 hp->mops->free(hp);
182}
183
184static struct mdesc_handle *cur_mdesc;
185static LIST_HEAD(mdesc_zombie_list);
186static DEFINE_SPINLOCK(mdesc_lock);
187
188struct 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}
201EXPORT_SYMBOL(mdesc_grab);
202
203void 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}
214EXPORT_SYMBOL(mdesc_release);
215
216static DEFINE_MUTEX(mdesc_mutex);
217static struct mdesc_notifier_client *client_list;
218
219void 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
233static 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. */
253static 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
308static 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
316static 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
327void 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
366out:
367 mutex_unlock(&mdesc_mutex);
368}
369
370static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
371{
372 return (struct mdesc_elem *) (mdesc + 1);
373}
374
375static void *name_block(struct mdesc_hdr *mdesc)
376{
377 return ((void *) node_block(mdesc)) + mdesc->node_sz;
378}
379
380static void *data_block(struct mdesc_hdr *mdesc)
381{
382 return ((void *) name_block(mdesc)) + mdesc->name_sz;
383}
384
385u64 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}
412EXPORT_SYMBOL(mdesc_node_by_name);
413
414const 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}
458EXPORT_SYMBOL(mdesc_get_property);
459
460u64 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}
484EXPORT_SYMBOL(mdesc_next_arc);
485
486u64 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}
494EXPORT_SYMBOL(mdesc_arc_target);
495
496const 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}
511EXPORT_SYMBOL(mdesc_node_name);
512
513static u64 max_cpus = 64;
514
515static 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
574static 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
617static void find_back_node_value(struct mdesc_handle *hp, u64 node,
618 char *srch_val,
619 void (*func)(struct mdesc_handle *, u64, int),
620 u64 val, int depth)
621{
622 u64 arc;
623
624 /* Since we have an estimate of recursion depth, do a sanity check. */
625 if (depth == 0)
626 return;
627
628 mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) {
629 u64 n = mdesc_arc_target(hp, arc);
630 const char *name = mdesc_node_name(hp, n);
631
632 if (!strcmp(srch_val, name))
633 (*func)(hp, n, val);
634
635 find_back_node_value(hp, n, srch_val, func, val, depth-1);
636 }
637}
638
639static void __mark_core_id(struct mdesc_handle *hp, u64 node,
640 int core_id)
641{
642 const u64 *id = mdesc_get_property(hp, node, "id", NULL);
643
644 if (*id < num_possible_cpus())
645 cpu_data(*id).core_id = core_id;
646}
647
648static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node,
649 int max_cache_id)
650{
651 const u64 *id = mdesc_get_property(hp, node, "id", NULL);
652
653 if (*id < num_possible_cpus()) {
654 cpu_data(*id).max_cache_id = max_cache_id;
655
656 /**
657 * On systems without explicit socket descriptions socket
658 * is max_cache_id
659 */
660 cpu_data(*id).sock_id = max_cache_id;
661 }
662}
663
664static void mark_core_ids(struct mdesc_handle *hp, u64 mp,
665 int core_id)
666{
667 find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10);
668}
669
670static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp,
671 int max_cache_id)
672{
673 find_back_node_value(hp, mp, "cpu", __mark_max_cache_id,
674 max_cache_id, 10);
675}
676
677static void set_core_ids(struct mdesc_handle *hp)
678{
679 int idx;
680 u64 mp;
681
682 idx = 1;
683
684 /* Identify unique cores by looking for cpus backpointed to by
685 * level 1 instruction caches.
686 */
687 mdesc_for_each_node_by_name(hp, mp, "cache") {
688 const u64 *level;
689 const char *type;
690 int len;
691
692 level = mdesc_get_property(hp, mp, "level", NULL);
693 if (*level != 1)
694 continue;
695
696 type = mdesc_get_property(hp, mp, "type", &len);
697 if (!of_find_in_proplist(type, "instn", len))
698 continue;
699
700 mark_core_ids(hp, mp, idx);
701 idx++;
702 }
703}
704
705static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level)
706{
707 u64 mp;
708 int idx = 1;
709 int fnd = 0;
710
711 /**
712 * Identify unique highest level of shared cache by looking for cpus
713 * backpointed to by shared level N caches.
714 */
715 mdesc_for_each_node_by_name(hp, mp, "cache") {
716 const u64 *cur_lvl;
717
718 cur_lvl = mdesc_get_property(hp, mp, "level", NULL);
719 if (*cur_lvl != level)
720 continue;
721 mark_max_cache_ids(hp, mp, idx);
722 idx++;
723 fnd = 1;
724 }
725 return fnd;
726}
727
728static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp)
729{
730 int idx = 1;
731
732 mdesc_for_each_node_by_name(hp, mp, "socket") {
733 u64 a;
734
735 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
736 u64 t = mdesc_arc_target(hp, a);
737 const char *name;
738 const u64 *id;
739
740 name = mdesc_node_name(hp, t);
741 if (strcmp(name, "cpu"))
742 continue;
743
744 id = mdesc_get_property(hp, t, "id", NULL);
745 if (*id < num_possible_cpus())
746 cpu_data(*id).sock_id = idx;
747 }
748 idx++;
749 }
750}
751
752static void set_sock_ids(struct mdesc_handle *hp)
753{
754 u64 mp;
755
756 /**
757 * Find the highest level of shared cache which pre-T7 is also
758 * the socket.
759 */
760 if (!set_max_cache_ids_by_cache(hp, 3))
761 set_max_cache_ids_by_cache(hp, 2);
762
763 /* If machine description exposes sockets data use it.*/
764 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets");
765 if (mp != MDESC_NODE_NULL)
766 set_sock_ids_by_socket(hp, mp);
767}
768
769static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
770{
771 u64 a;
772
773 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
774 u64 t = mdesc_arc_target(hp, a);
775 const char *name;
776 const u64 *id;
777
778 name = mdesc_node_name(hp, t);
779 if (strcmp(name, "cpu"))
780 continue;
781
782 id = mdesc_get_property(hp, t, "id", NULL);
783 if (*id < NR_CPUS)
784 cpu_data(*id).proc_id = proc_id;
785 }
786}
787
788static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
789{
790 int idx;
791 u64 mp;
792
793 idx = 0;
794 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
795 const char *type;
796 int len;
797
798 type = mdesc_get_property(hp, mp, "type", &len);
799 if (!of_find_in_proplist(type, "int", len) &&
800 !of_find_in_proplist(type, "integer", len))
801 continue;
802
803 mark_proc_ids(hp, mp, idx);
804 idx++;
805 }
806}
807
808static void set_proc_ids(struct mdesc_handle *hp)
809{
810 __set_proc_ids(hp, "exec_unit");
811 __set_proc_ids(hp, "exec-unit");
812}
813
814static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
815 unsigned long def, unsigned long max)
816{
817 u64 val;
818
819 if (!p)
820 goto use_default;
821 val = *p;
822
823 if (!val || val >= 64)
824 goto use_default;
825
826 if (val > max)
827 val = max;
828
829 *mask = ((1U << val) * 64U) - 1U;
830 return;
831
832use_default:
833 *mask = ((1U << def) * 64U) - 1U;
834}
835
836static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
837 struct trap_per_cpu *tb)
838{
839 static int printed;
840 const u64 *val;
841
842 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
843 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
844
845 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
846 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
847
848 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
849 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
850
851 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
852 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
853 if (!printed++) {
854 pr_info("SUN4V: Mondo queue sizes "
855 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
856 tb->cpu_mondo_qmask + 1,
857 tb->dev_mondo_qmask + 1,
858 tb->resum_qmask + 1,
859 tb->nonresum_qmask + 1);
860 }
861}
862
863static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
864{
865 struct mdesc_handle *hp = mdesc_grab();
866 void *ret = NULL;
867 u64 mp;
868
869 mdesc_for_each_node_by_name(hp, mp, "cpu") {
870 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
871 int cpuid = *id;
872
873#ifdef CONFIG_SMP
874 if (cpuid >= NR_CPUS) {
875 printk(KERN_WARNING "Ignoring CPU %d which is "
876 ">= NR_CPUS (%d)\n",
877 cpuid, NR_CPUS);
878 continue;
879 }
880 if (!cpumask_test_cpu(cpuid, mask))
881 continue;
882#endif
883
884 ret = func(hp, mp, cpuid, arg);
885 if (ret)
886 goto out;
887 }
888out:
889 mdesc_release(hp);
890 return ret;
891}
892
893static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
894 void *arg)
895{
896 ncpus_probed++;
897#ifdef CONFIG_SMP
898 set_cpu_present(cpuid, true);
899#endif
900 return NULL;
901}
902
903void mdesc_populate_present_mask(cpumask_t *mask)
904{
905 if (tlb_type != hypervisor)
906 return;
907
908 ncpus_probed = 0;
909 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
910}
911
912static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
913{
914 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
915 unsigned long *pgsz_mask = arg;
916 u64 val;
917
918 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
919 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
920 if (pgsz_prop)
921 val = *pgsz_prop;
922
923 if (!*pgsz_mask)
924 *pgsz_mask = val;
925 else
926 *pgsz_mask &= val;
927 return NULL;
928}
929
930void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
931{
932 *pgsz_mask = 0;
933 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
934}
935
936static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
937 void *arg)
938{
939 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
940 struct trap_per_cpu *tb;
941 cpuinfo_sparc *c;
942 u64 a;
943
944#ifndef CONFIG_SMP
945 /* On uniprocessor we only want the values for the
946 * real physical cpu the kernel booted onto, however
947 * cpu_data() only has one entry at index 0.
948 */
949 if (cpuid != real_hard_smp_processor_id())
950 return NULL;
951 cpuid = 0;
952#endif
953
954 c = &cpu_data(cpuid);
955 c->clock_tick = *cfreq;
956
957 tb = &trap_block[cpuid];
958 get_mondo_data(hp, mp, tb);
959
960 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
961 u64 j, t = mdesc_arc_target(hp, a);
962 const char *t_name;
963
964 t_name = mdesc_node_name(hp, t);
965 if (!strcmp(t_name, "cache")) {
966 fill_in_one_cache(c, hp, t);
967 continue;
968 }
969
970 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
971 u64 n = mdesc_arc_target(hp, j);
972 const char *n_name;
973
974 n_name = mdesc_node_name(hp, n);
975 if (!strcmp(n_name, "cache"))
976 fill_in_one_cache(c, hp, n);
977 }
978 }
979
980 c->core_id = 0;
981 c->proc_id = -1;
982
983 return NULL;
984}
985
986void mdesc_fill_in_cpu_data(cpumask_t *mask)
987{
988 struct mdesc_handle *hp;
989
990 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
991
992 hp = mdesc_grab();
993
994 set_core_ids(hp);
995 set_proc_ids(hp);
996 set_sock_ids(hp);
997
998 mdesc_release(hp);
999
1000 smp_fill_in_sib_core_maps();
1001}
1002
1003/* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is
1004 * opened. Hold this reference until /dev/mdesc is closed to ensure
1005 * mdesc data structure is not released underneath us. Store the
1006 * pointer to mdesc structure in private_data for read and seek to use
1007 */
1008static int mdesc_open(struct inode *inode, struct file *file)
1009{
1010 struct mdesc_handle *hp = mdesc_grab();
1011
1012 if (!hp)
1013 return -ENODEV;
1014
1015 file->private_data = hp;
1016
1017 return 0;
1018}
1019
1020static ssize_t mdesc_read(struct file *file, char __user *buf,
1021 size_t len, loff_t *offp)
1022{
1023 struct mdesc_handle *hp = file->private_data;
1024 unsigned char *mdesc;
1025 int bytes_left, count = len;
1026
1027 if (*offp >= hp->handle_size)
1028 return 0;
1029
1030 bytes_left = hp->handle_size - *offp;
1031 if (count > bytes_left)
1032 count = bytes_left;
1033
1034 mdesc = (unsigned char *)&hp->mdesc;
1035 mdesc += *offp;
1036 if (!copy_to_user(buf, mdesc, count)) {
1037 *offp += count;
1038 return count;
1039 } else {
1040 return -EFAULT;
1041 }
1042}
1043
1044static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
1045{
1046 struct mdesc_handle *hp = file->private_data;
1047
1048 return no_seek_end_llseek_size(file, offset, whence, hp->handle_size);
1049}
1050
1051/* mdesc_close() - /dev/mdesc is being closed, release the reference to
1052 * mdesc structure.
1053 */
1054static int mdesc_close(struct inode *inode, struct file *file)
1055{
1056 mdesc_release(file->private_data);
1057 return 0;
1058}
1059
1060static const struct file_operations mdesc_fops = {
1061 .open = mdesc_open,
1062 .read = mdesc_read,
1063 .llseek = mdesc_llseek,
1064 .release = mdesc_close,
1065 .owner = THIS_MODULE,
1066};
1067
1068static struct miscdevice mdesc_misc = {
1069 .minor = MISC_DYNAMIC_MINOR,
1070 .name = "mdesc",
1071 .fops = &mdesc_fops,
1072};
1073
1074static int __init mdesc_misc_init(void)
1075{
1076 return misc_register(&mdesc_misc);
1077}
1078
1079__initcall(mdesc_misc_init);
1080
1081void __init sun4v_mdesc_init(void)
1082{
1083 struct mdesc_handle *hp;
1084 unsigned long len, real_len, status;
1085
1086 (void) sun4v_mach_desc(0UL, 0UL, &len);
1087
1088 printk("MDESC: Size is %lu bytes.\n", len);
1089
1090 hp = mdesc_alloc(len, &memblock_mdesc_ops);
1091 if (hp == NULL) {
1092 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
1093 prom_halt();
1094 }
1095
1096 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
1097 if (status != HV_EOK || real_len > len) {
1098 prom_printf("sun4v_mach_desc fails, err(%lu), "
1099 "len(%lu), real_len(%lu)\n",
1100 status, len, real_len);
1101 mdesc_free(hp);
1102 prom_halt();
1103 }
1104
1105 cur_mdesc = hp;
1106
1107 report_platform_properties();
1108}