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