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Linux 4.13.16
[linux/fpc-iii.git] / arch / sparc / kernel / mdesc.c
blobfa466ce45bc9bf115a488aaa95279922efc96bc4
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 */
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 typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,
79 union md_node_info *);
80 typedef void (*mdesc_node_info_rel_f)(union md_node_info *);
81 typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);
82
83 struct md_node_ops {
84 char *name;
85 mdesc_node_info_get_f get_info;
86 mdesc_node_info_rel_f rel_info;
87 mdesc_node_match_f node_match;
88 };
89
90 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
91 union md_node_info *node_info);
92 static void rel_vdev_port_node_info(union md_node_info *node_info);
93 static bool vdev_port_node_match(union md_node_info *a_node_info,
94 union md_node_info *b_node_info);
95
96 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
97 union md_node_info *node_info);
98 static void rel_ds_port_node_info(union md_node_info *node_info);
99 static bool ds_port_node_match(union md_node_info *a_node_info,
100 union md_node_info *b_node_info);
101
102 /* supported node types which can be registered */
103 static struct md_node_ops md_node_ops_table[] = {
104 {"virtual-device-port", get_vdev_port_node_info,
105 rel_vdev_port_node_info, vdev_port_node_match},
106 {"domain-services-port", get_ds_port_node_info,
107 rel_ds_port_node_info, ds_port_node_match},
108 {NULL, NULL, NULL, NULL}
109 };
110
111 static void mdesc_get_node_ops(const char *node_name,
112 mdesc_node_info_get_f *get_info_f,
113 mdesc_node_info_rel_f *rel_info_f,
114 mdesc_node_match_f *match_f)
115 {
116 int i;
117
118 if (get_info_f)
119 *get_info_f = NULL;
120
121 if (rel_info_f)
122 *rel_info_f = NULL;
123
124 if (match_f)
125 *match_f = NULL;
126
127 if (!node_name)
128 return;
129
130 for (i = 0; md_node_ops_table[i].name != NULL; i++) {
131 if (strcmp(md_node_ops_table[i].name, node_name) == 0) {
132 if (get_info_f)
133 *get_info_f = md_node_ops_table[i].get_info;
134
135 if (rel_info_f)
136 *rel_info_f = md_node_ops_table[i].rel_info;
137
138 if (match_f)
139 *match_f = md_node_ops_table[i].node_match;
140
141 break;
142 }
143 }
144 }
145
146 static void mdesc_handle_init(struct mdesc_handle *hp,
147 unsigned int handle_size,
148 void *base)
149 {
150 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
151
152 memset(hp, 0, handle_size);
153 INIT_LIST_HEAD(&hp->list);
154 hp->self_base = base;
155 atomic_set(&hp->refcnt, 1);
156 hp->handle_size = handle_size;
157 }
158
159 static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
160 {
161 unsigned int handle_size, alloc_size;
162 struct mdesc_handle *hp;
163 unsigned long paddr;
164
165 handle_size = (sizeof(struct mdesc_handle) -
166 sizeof(struct mdesc_hdr) +
167 mdesc_size);
168 alloc_size = PAGE_ALIGN(handle_size);
169
170 paddr = memblock_alloc(alloc_size, PAGE_SIZE);
171
172 hp = NULL;
173 if (paddr) {
174 hp = __va(paddr);
175 mdesc_handle_init(hp, handle_size, hp);
176 }
177 return hp;
178 }
179
180 static void __init mdesc_memblock_free(struct mdesc_handle *hp)
181 {
182 unsigned int alloc_size;
183 unsigned long start;
184
185 BUG_ON(atomic_read(&hp->refcnt) != 0);
186 BUG_ON(!list_empty(&hp->list));
187
188 alloc_size = PAGE_ALIGN(hp->handle_size);
189 start = __pa(hp);
190 free_bootmem_late(start, alloc_size);
191 }
192
193 static struct mdesc_mem_ops memblock_mdesc_ops = {
194 .alloc = mdesc_memblock_alloc,
195 .free = mdesc_memblock_free,
196 };
197
198 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
199 {
200 unsigned int handle_size;
201 struct mdesc_handle *hp;
202 unsigned long addr;
203 void *base;
204
205 handle_size = (sizeof(struct mdesc_handle) -
206 sizeof(struct mdesc_hdr) +
207 mdesc_size);
208 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
209 if (!base)
210 return NULL;
211
212 addr = (unsigned long)base;
213 addr = (addr + 15UL) & ~15UL;
214 hp = (struct mdesc_handle *) addr;
215
216 mdesc_handle_init(hp, handle_size, base);
217
218 return hp;
219 }
220
221 static void mdesc_kfree(struct mdesc_handle *hp)
222 {
223 BUG_ON(atomic_read(&hp->refcnt) != 0);
224 BUG_ON(!list_empty(&hp->list));
225
226 kfree(hp->self_base);
227 }
228
229 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
230 .alloc = mdesc_kmalloc,
231 .free = mdesc_kfree,
232 };
233
234 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
235 struct mdesc_mem_ops *mops)
236 {
237 struct mdesc_handle *hp = mops->alloc(mdesc_size);
238
239 if (hp)
240 hp->mops = mops;
241
242 return hp;
243 }
244
245 static void mdesc_free(struct mdesc_handle *hp)
246 {
247 hp->mops->free(hp);
248 }
249
250 static struct mdesc_handle *cur_mdesc;
251 static LIST_HEAD(mdesc_zombie_list);
252 static DEFINE_SPINLOCK(mdesc_lock);
253
254 struct mdesc_handle *mdesc_grab(void)
255 {
256 struct mdesc_handle *hp;
257 unsigned long flags;
258
259 spin_lock_irqsave(&mdesc_lock, flags);
260 hp = cur_mdesc;
261 if (hp)
262 atomic_inc(&hp->refcnt);
263 spin_unlock_irqrestore(&mdesc_lock, flags);
264
265 return hp;
266 }
267 EXPORT_SYMBOL(mdesc_grab);
268
269 void mdesc_release(struct mdesc_handle *hp)
270 {
271 unsigned long flags;
272
273 spin_lock_irqsave(&mdesc_lock, flags);
274 if (atomic_dec_and_test(&hp->refcnt)) {
275 list_del_init(&hp->list);
276 hp->mops->free(hp);
277 }
278 spin_unlock_irqrestore(&mdesc_lock, flags);
279 }
280 EXPORT_SYMBOL(mdesc_release);
281
282 static DEFINE_MUTEX(mdesc_mutex);
283 static struct mdesc_notifier_client *client_list;
284
285 void mdesc_register_notifier(struct mdesc_notifier_client *client)
286 {
287 bool supported = false;
288 u64 node;
289 int i;
290
291 mutex_lock(&mdesc_mutex);
292
293 /* check to see if the node is supported for registration */
294 for (i = 0; md_node_ops_table[i].name != NULL; i++) {
295 if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) {
296 supported = true;
297 break;
298 }
299 }
300
301 if (!supported) {
302 pr_err("MD: %s node not supported\n", client->node_name);
303 mutex_unlock(&mdesc_mutex);
304 return;
305 }
306
307 client->next = client_list;
308 client_list = client;
309
310 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
311 client->add(cur_mdesc, node, client->node_name);
312
313 mutex_unlock(&mdesc_mutex);
314 }
315
316 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
317 {
318 const u64 *id;
319 u64 a;
320
321 id = NULL;
322 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
323 u64 target;
324
325 target = mdesc_arc_target(hp, a);
326 id = mdesc_get_property(hp, target,
327 "cfg-handle", NULL);
328 if (id)
329 break;
330 }
331
332 return id;
333 }
334
335 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
336 union md_node_info *node_info)
337 {
338 const u64 *parent_cfg_hdlp;
339 const char *name;
340 const u64 *idp;
341
342 /*
343 * Virtual device nodes are distinguished by:
344 * 1. "id" property
345 * 2. "name" property
346 * 3. parent node "cfg-handle" property
347 */
348 idp = mdesc_get_property(md, node, "id", NULL);
349 name = mdesc_get_property(md, node, "name", NULL);
350 parent_cfg_hdlp = parent_cfg_handle(md, node);
351
352 if (!idp || !name || !parent_cfg_hdlp)
353 return -1;
354
355 node_info->vdev_port.id = *idp;
356 node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL);
357 node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp;
358
359 return 0;
360 }
361
362 static void rel_vdev_port_node_info(union md_node_info *node_info)
363 {
364 if (node_info && node_info->vdev_port.name) {
365 kfree_const(node_info->vdev_port.name);
366 node_info->vdev_port.name = NULL;
367 }
368 }
369
370 static bool vdev_port_node_match(union md_node_info *a_node_info,
371 union md_node_info *b_node_info)
372 {
373 if (a_node_info->vdev_port.id != b_node_info->vdev_port.id)
374 return false;
375
376 if (a_node_info->vdev_port.parent_cfg_hdl !=
377 b_node_info->vdev_port.parent_cfg_hdl)
378 return false;
379
380 if (strncmp(a_node_info->vdev_port.name,
381 b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0)
382 return false;
383
384 return true;
385 }
386
387 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
388 union md_node_info *node_info)
389 {
390 const u64 *idp;
391
392 /* DS port nodes use the "id" property to distinguish them */
393 idp = mdesc_get_property(md, node, "id", NULL);
394 if (!idp)
395 return -1;
396
397 node_info->ds_port.id = *idp;
398
399 return 0;
400 }
401
402 static void rel_ds_port_node_info(union md_node_info *node_info)
403 {
404 }
405
406 static bool ds_port_node_match(union md_node_info *a_node_info,
407 union md_node_info *b_node_info)
408 {
409 if (a_node_info->ds_port.id != b_node_info->ds_port.id)
410 return false;
411
412 return true;
413 }
414
415 /* Run 'func' on nodes which are in A but not in B. */
416 static void invoke_on_missing(const char *name,
417 struct mdesc_handle *a,
418 struct mdesc_handle *b,
419 void (*func)(struct mdesc_handle *, u64,
420 const char *node_name))
421 {
422 mdesc_node_info_get_f get_info_func;
423 mdesc_node_info_rel_f rel_info_func;
424 mdesc_node_match_f node_match_func;
425 union md_node_info a_node_info;
426 union md_node_info b_node_info;
427 bool found;
428 u64 a_node;
429 u64 b_node;
430 int rv;
431
432 /*
433 * Find the get_info, rel_info and node_match ops for the given
434 * node name
435 */
436 mdesc_get_node_ops(name, &get_info_func, &rel_info_func,
437 &node_match_func);
438
439 /* If we didn't find a match, the node type is not supported */
440 if (!get_info_func || !rel_info_func || !node_match_func) {
441 pr_err("MD: %s node type is not supported\n", name);
442 return;
443 }
444
445 mdesc_for_each_node_by_name(a, a_node, name) {
446 found = false;
447
448 rv = get_info_func(a, a_node, &a_node_info);
449 if (rv != 0) {
450 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
451 name);
452 continue;
453 }
454
455 /* Check each node in B for node matching a_node */
456 mdesc_for_each_node_by_name(b, b_node, name) {
457 rv = get_info_func(b, b_node, &b_node_info);
458 if (rv != 0)
459 continue;
460
461 if (node_match_func(&a_node_info, &b_node_info)) {
462 found = true;
463 rel_info_func(&b_node_info);
464 break;
465 }
466
467 rel_info_func(&b_node_info);
468 }
469
470 rel_info_func(&a_node_info);
471
472 if (!found)
473 func(a, a_node, name);
474 }
475 }
476
477 static void notify_one(struct mdesc_notifier_client *p,
478 struct mdesc_handle *old_hp,
479 struct mdesc_handle *new_hp)
480 {
481 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
482 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
483 }
484
485 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
486 struct mdesc_handle *new_hp)
487 {
488 struct mdesc_notifier_client *p = client_list;
489
490 while (p) {
491 notify_one(p, old_hp, new_hp);
492 p = p->next;
493 }
494 }
495
496 void mdesc_update(void)
497 {
498 unsigned long len, real_len, status;
499 struct mdesc_handle *hp, *orig_hp;
500 unsigned long flags;
501
502 mutex_lock(&mdesc_mutex);
503
504 (void) sun4v_mach_desc(0UL, 0UL, &len);
505
506 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
507 if (!hp) {
508 printk(KERN_ERR "MD: mdesc alloc fails\n");
509 goto out;
510 }
511
512 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
513 if (status != HV_EOK || real_len > len) {
514 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
515 status);
516 atomic_dec(&hp->refcnt);
517 mdesc_free(hp);
518 goto out;
519 }
520
521 spin_lock_irqsave(&mdesc_lock, flags);
522 orig_hp = cur_mdesc;
523 cur_mdesc = hp;
524 spin_unlock_irqrestore(&mdesc_lock, flags);
525
526 mdesc_notify_clients(orig_hp, hp);
527
528 spin_lock_irqsave(&mdesc_lock, flags);
529 if (atomic_dec_and_test(&orig_hp->refcnt))
530 mdesc_free(orig_hp);
531 else
532 list_add(&orig_hp->list, &mdesc_zombie_list);
533 spin_unlock_irqrestore(&mdesc_lock, flags);
534
535 out:
536 mutex_unlock(&mdesc_mutex);
537 }
538
539 u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
540 union md_node_info *node_info)
541 {
542 mdesc_node_info_get_f get_info_func;
543 mdesc_node_info_rel_f rel_info_func;
544 mdesc_node_match_f node_match_func;
545 union md_node_info hp_node_info;
546 u64 hp_node;
547 int rv;
548
549 if (hp == NULL || node_name == NULL || node_info == NULL)
550 return MDESC_NODE_NULL;
551
552 /* Find the ops for the given node name */
553 mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func,
554 &node_match_func);
555
556 /* If we didn't find ops for the given node name, it is not supported */
557 if (!get_info_func || !rel_info_func || !node_match_func) {
558 pr_err("MD: %s node is not supported\n", node_name);
559 return -EINVAL;
560 }
561
562 mdesc_for_each_node_by_name(hp, hp_node, node_name) {
563 rv = get_info_func(hp, hp_node, &hp_node_info);
564 if (rv != 0)
565 continue;
566
567 if (node_match_func(node_info, &hp_node_info))
568 break;
569
570 rel_info_func(&hp_node_info);
571 }
572
573 rel_info_func(&hp_node_info);
574
575 return hp_node;
576 }
577 EXPORT_SYMBOL(mdesc_get_node);
578
579 int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
580 const char *node_name, union md_node_info *node_info)
581 {
582 mdesc_node_info_get_f get_info_func;
583 int rv;
584
585 if (hp == NULL || node == MDESC_NODE_NULL ||
586 node_name == NULL || node_info == NULL)
587 return -EINVAL;
588
589 /* Find the get_info op for the given node name */
590 mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL);
591
592 /* If we didn't find a get_info_func, the node name is not supported */
593 if (get_info_func == NULL) {
594 pr_err("MD: %s node is not supported\n", node_name);
595 return -EINVAL;
596 }
597
598 rv = get_info_func(hp, node, node_info);
599 if (rv != 0) {
600 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
601 node_name);
602 return -1;
603 }
604
605 return 0;
606 }
607 EXPORT_SYMBOL(mdesc_get_node_info);
608
609 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
610 {
611 return (struct mdesc_elem *) (mdesc + 1);
612 }
613
614 static void *name_block(struct mdesc_hdr *mdesc)
615 {
616 return ((void *) node_block(mdesc)) + mdesc->node_sz;
617 }
618
619 static void *data_block(struct mdesc_hdr *mdesc)
620 {
621 return ((void *) name_block(mdesc)) + mdesc->name_sz;
622 }
623
624 u64 mdesc_node_by_name(struct mdesc_handle *hp,
625 u64 from_node, const char *name)
626 {
627 struct mdesc_elem *ep = node_block(&hp->mdesc);
628 const char *names = name_block(&hp->mdesc);
629 u64 last_node = hp->mdesc.node_sz / 16;
630 u64 ret;
631
632 if (from_node == MDESC_NODE_NULL) {
633 ret = from_node = 0;
634 } else if (from_node >= last_node) {
635 return MDESC_NODE_NULL;
636 } else {
637 ret = ep[from_node].d.val;
638 }
639
640 while (ret < last_node) {
641 if (ep[ret].tag != MD_NODE)
642 return MDESC_NODE_NULL;
643 if (!strcmp(names + ep[ret].name_offset, name))
644 break;
645 ret = ep[ret].d.val;
646 }
647 if (ret >= last_node)
648 ret = MDESC_NODE_NULL;
649 return ret;
650 }
651 EXPORT_SYMBOL(mdesc_node_by_name);
652
653 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
654 const char *name, int *lenp)
655 {
656 const char *names = name_block(&hp->mdesc);
657 u64 last_node = hp->mdesc.node_sz / 16;
658 void *data = data_block(&hp->mdesc);
659 struct mdesc_elem *ep;
660
661 if (node == MDESC_NODE_NULL || node >= last_node)
662 return NULL;
663
664 ep = node_block(&hp->mdesc) + node;
665 ep++;
666 for (; ep->tag != MD_NODE_END; ep++) {
667 void *val = NULL;
668 int len = 0;
669
670 switch (ep->tag) {
671 case MD_PROP_VAL:
672 val = &ep->d.val;
673 len = 8;
674 break;
675
676 case MD_PROP_STR:
677 case MD_PROP_DATA:
678 val = data + ep->d.data.data_offset;
679 len = ep->d.data.data_len;
680 break;
681
682 default:
683 break;
684 }
685 if (!val)
686 continue;
687
688 if (!strcmp(names + ep->name_offset, name)) {
689 if (lenp)
690 *lenp = len;
691 return val;
692 }
693 }
694
695 return NULL;
696 }
697 EXPORT_SYMBOL(mdesc_get_property);
698
699 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
700 {
701 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
702 const char *names = name_block(&hp->mdesc);
703 u64 last_node = hp->mdesc.node_sz / 16;
704
705 if (from == MDESC_NODE_NULL || from >= last_node)
706 return MDESC_NODE_NULL;
707
708 ep = base + from;
709
710 ep++;
711 for (; ep->tag != MD_NODE_END; ep++) {
712 if (ep->tag != MD_PROP_ARC)
713 continue;
714
715 if (strcmp(names + ep->name_offset, arc_type))
716 continue;
717
718 return ep - base;
719 }
720
721 return MDESC_NODE_NULL;
722 }
723 EXPORT_SYMBOL(mdesc_next_arc);
724
725 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
726 {
727 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
728
729 ep = base + arc;
730
731 return ep->d.val;
732 }
733 EXPORT_SYMBOL(mdesc_arc_target);
734
735 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
736 {
737 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
738 const char *names = name_block(&hp->mdesc);
739 u64 last_node = hp->mdesc.node_sz / 16;
740
741 if (node == MDESC_NODE_NULL || node >= last_node)
742 return NULL;
743
744 ep = base + node;
745 if (ep->tag != MD_NODE)
746 return NULL;
747
748 return names + ep->name_offset;
749 }
750 EXPORT_SYMBOL(mdesc_node_name);
751
752 static u64 max_cpus = 64;
753
754 static void __init report_platform_properties(void)
755 {
756 struct mdesc_handle *hp = mdesc_grab();
757 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
758 const char *s;
759 const u64 *v;
760
761 if (pn == MDESC_NODE_NULL) {
762 prom_printf("No platform node in machine-description.\n");
763 prom_halt();
764 }
765
766 s = mdesc_get_property(hp, pn, "banner-name", NULL);
767 printk("PLATFORM: banner-name [%s]\n", s);
768 s = mdesc_get_property(hp, pn, "name", NULL);
769 printk("PLATFORM: name [%s]\n", s);
770
771 v = mdesc_get_property(hp, pn, "hostid", NULL);
772 if (v)
773 printk("PLATFORM: hostid [%08llx]\n", *v);
774 v = mdesc_get_property(hp, pn, "serial#", NULL);
775 if (v)
776 printk("PLATFORM: serial# [%08llx]\n", *v);
777 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
778 printk("PLATFORM: stick-frequency [%08llx]\n", *v);
779 v = mdesc_get_property(hp, pn, "mac-address", NULL);
780 if (v)
781 printk("PLATFORM: mac-address [%llx]\n", *v);
782 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
783 if (v)
784 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
785 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
786 if (v)
787 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
788 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
789 if (v) {
790 max_cpus = *v;
791 printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
792 }
793
794 #ifdef CONFIG_SMP
795 {
796 int max_cpu, i;
797
798 if (v) {
799 max_cpu = *v;
800 if (max_cpu > NR_CPUS)
801 max_cpu = NR_CPUS;
802 } else {
803 max_cpu = NR_CPUS;
804 }
805 for (i = 0; i < max_cpu; i++)
806 set_cpu_possible(i, true);
807 }
808 #endif
809
810 mdesc_release(hp);
811 }
812
813 static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp)
814 {
815 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
816 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
817 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
818 const char *type;
819 int type_len;
820
821 type = mdesc_get_property(hp, mp, "type", &type_len);
822
823 switch (*level) {
824 case 1:
825 if (of_find_in_proplist(type, "instn", type_len)) {
826 c->icache_size = *size;
827 c->icache_line_size = *line_size;
828 } else if (of_find_in_proplist(type, "data", type_len)) {
829 c->dcache_size = *size;
830 c->dcache_line_size = *line_size;
831 }
832 break;
833
834 case 2:
835 c->ecache_size = *size;
836 c->ecache_line_size = *line_size;
837 break;
838
839 default:
840 break;
841 }
842
843 if (*level == 1) {
844 u64 a;
845
846 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
847 u64 target = mdesc_arc_target(hp, a);
848 const char *name = mdesc_node_name(hp, target);
849
850 if (!strcmp(name, "cache"))
851 fill_in_one_cache(c, hp, target);
852 }
853 }
854 }
855
856 static void find_back_node_value(struct mdesc_handle *hp, u64 node,
857 char *srch_val,
858 void (*func)(struct mdesc_handle *, u64, int),
859 u64 val, int depth)
860 {
861 u64 arc;
862
863 /* Since we have an estimate of recursion depth, do a sanity check. */
864 if (depth == 0)
865 return;
866
867 mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) {
868 u64 n = mdesc_arc_target(hp, arc);
869 const char *name = mdesc_node_name(hp, n);
870
871 if (!strcmp(srch_val, name))
872 (*func)(hp, n, val);
873
874 find_back_node_value(hp, n, srch_val, func, val, depth-1);
875 }
876 }
877
878 static void __mark_core_id(struct mdesc_handle *hp, u64 node,
879 int core_id)
880 {
881 const u64 *id = mdesc_get_property(hp, node, "id", NULL);
882
883 if (*id < num_possible_cpus())
884 cpu_data(*id).core_id = core_id;
885 }
886
887 static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node,
888 int max_cache_id)
889 {
890 const u64 *id = mdesc_get_property(hp, node, "id", NULL);
891
892 if (*id < num_possible_cpus()) {
893 cpu_data(*id).max_cache_id = max_cache_id;
894
895 /**
896 * On systems without explicit socket descriptions socket
897 * is max_cache_id
898 */
899 cpu_data(*id).sock_id = max_cache_id;
900 }
901 }
902
903 static void mark_core_ids(struct mdesc_handle *hp, u64 mp,
904 int core_id)
905 {
906 find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10);
907 }
908
909 static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp,
910 int max_cache_id)
911 {
912 find_back_node_value(hp, mp, "cpu", __mark_max_cache_id,
913 max_cache_id, 10);
914 }
915
916 static void set_core_ids(struct mdesc_handle *hp)
917 {
918 int idx;
919 u64 mp;
920
921 idx = 1;
922
923 /* Identify unique cores by looking for cpus backpointed to by
924 * level 1 instruction caches.
925 */
926 mdesc_for_each_node_by_name(hp, mp, "cache") {
927 const u64 *level;
928 const char *type;
929 int len;
930
931 level = mdesc_get_property(hp, mp, "level", NULL);
932 if (*level != 1)
933 continue;
934
935 type = mdesc_get_property(hp, mp, "type", &len);
936 if (!of_find_in_proplist(type, "instn", len))
937 continue;
938
939 mark_core_ids(hp, mp, idx);
940 idx++;
941 }
942 }
943
944 static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level)
945 {
946 u64 mp;
947 int idx = 1;
948 int fnd = 0;
949
950 /**
951 * Identify unique highest level of shared cache by looking for cpus
952 * backpointed to by shared level N caches.
953 */
954 mdesc_for_each_node_by_name(hp, mp, "cache") {
955 const u64 *cur_lvl;
956
957 cur_lvl = mdesc_get_property(hp, mp, "level", NULL);
958 if (*cur_lvl != level)
959 continue;
960 mark_max_cache_ids(hp, mp, idx);
961 idx++;
962 fnd = 1;
963 }
964 return fnd;
965 }
966
967 static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp)
968 {
969 int idx = 1;
970
971 mdesc_for_each_node_by_name(hp, mp, "socket") {
972 u64 a;
973
974 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
975 u64 t = mdesc_arc_target(hp, a);
976 const char *name;
977 const u64 *id;
978
979 name = mdesc_node_name(hp, t);
980 if (strcmp(name, "cpu"))
981 continue;
982
983 id = mdesc_get_property(hp, t, "id", NULL);
984 if (*id < num_possible_cpus())
985 cpu_data(*id).sock_id = idx;
986 }
987 idx++;
988 }
989 }
990
991 static void set_sock_ids(struct mdesc_handle *hp)
992 {
993 u64 mp;
994
995 /**
996 * Find the highest level of shared cache which pre-T7 is also
997 * the socket.
998 */
999 if (!set_max_cache_ids_by_cache(hp, 3))
1000 set_max_cache_ids_by_cache(hp, 2);
1001
1002 /* If machine description exposes sockets data use it.*/
1003 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets");
1004 if (mp != MDESC_NODE_NULL)
1005 set_sock_ids_by_socket(hp, mp);
1006 }
1007
1008 static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
1009 {
1010 u64 a;
1011
1012 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
1013 u64 t = mdesc_arc_target(hp, a);
1014 const char *name;
1015 const u64 *id;
1016
1017 name = mdesc_node_name(hp, t);
1018 if (strcmp(name, "cpu"))
1019 continue;
1020
1021 id = mdesc_get_property(hp, t, "id", NULL);
1022 if (*id < NR_CPUS)
1023 cpu_data(*id).proc_id = proc_id;
1024 }
1025 }
1026
1027 static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
1028 {
1029 int idx;
1030 u64 mp;
1031
1032 idx = 0;
1033 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
1034 const char *type;
1035 int len;
1036
1037 type = mdesc_get_property(hp, mp, "type", &len);
1038 if (!of_find_in_proplist(type, "int", len) &&
1039 !of_find_in_proplist(type, "integer", len))
1040 continue;
1041
1042 mark_proc_ids(hp, mp, idx);
1043 idx++;
1044 }
1045 }
1046
1047 static void set_proc_ids(struct mdesc_handle *hp)
1048 {
1049 __set_proc_ids(hp, "exec_unit");
1050 __set_proc_ids(hp, "exec-unit");
1051 }
1052
1053 static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
1054 unsigned long def, unsigned long max)
1055 {
1056 u64 val;
1057
1058 if (!p)
1059 goto use_default;
1060 val = *p;
1061
1062 if (!val || val >= 64)
1063 goto use_default;
1064
1065 if (val > max)
1066 val = max;
1067
1068 *mask = ((1U << val) * 64U) - 1U;
1069 return;
1070
1071 use_default:
1072 *mask = ((1U << def) * 64U) - 1U;
1073 }
1074
1075 static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
1076 struct trap_per_cpu *tb)
1077 {
1078 static int printed;
1079 const u64 *val;
1080
1081 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
1082 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
1083
1084 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
1085 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
1086
1087 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
1088 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
1089
1090 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
1091 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
1092 if (!printed++) {
1093 pr_info("SUN4V: Mondo queue sizes "
1094 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
1095 tb->cpu_mondo_qmask + 1,
1096 tb->dev_mondo_qmask + 1,
1097 tb->resum_qmask + 1,
1098 tb->nonresum_qmask + 1);
1099 }
1100 }
1101
1102 static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
1103 {
1104 struct mdesc_handle *hp = mdesc_grab();
1105 void *ret = NULL;
1106 u64 mp;
1107
1108 mdesc_for_each_node_by_name(hp, mp, "cpu") {
1109 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
1110 int cpuid = *id;
1111
1112 #ifdef CONFIG_SMP
1113 if (cpuid >= NR_CPUS) {
1114 printk(KERN_WARNING "Ignoring CPU %d which is "
1115 ">= NR_CPUS (%d)\n",
1116 cpuid, NR_CPUS);
1117 continue;
1118 }
1119 if (!cpumask_test_cpu(cpuid, mask))
1120 continue;
1121 #endif
1122
1123 ret = func(hp, mp, cpuid, arg);
1124 if (ret)
1125 goto out;
1126 }
1127 out:
1128 mdesc_release(hp);
1129 return ret;
1130 }
1131
1132 static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
1133 void *arg)
1134 {
1135 ncpus_probed++;
1136 #ifdef CONFIG_SMP
1137 set_cpu_present(cpuid, true);
1138 #endif
1139 return NULL;
1140 }
1141
1142 void mdesc_populate_present_mask(cpumask_t *mask)
1143 {
1144 if (tlb_type != hypervisor)
1145 return;
1146
1147 ncpus_probed = 0;
1148 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
1149 }
1150
1151 static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
1152 {
1153 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
1154 unsigned long *pgsz_mask = arg;
1155 u64 val;
1156
1157 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
1158 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
1159 if (pgsz_prop)
1160 val = *pgsz_prop;
1161
1162 if (!*pgsz_mask)
1163 *pgsz_mask = val;
1164 else
1165 *pgsz_mask &= val;
1166 return NULL;
1167 }
1168
1169 void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
1170 {
1171 *pgsz_mask = 0;
1172 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
1173 }
1174
1175 static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
1176 void *arg)
1177 {
1178 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
1179 struct trap_per_cpu *tb;
1180 cpuinfo_sparc *c;
1181 u64 a;
1182
1183 #ifndef CONFIG_SMP
1184 /* On uniprocessor we only want the values for the
1185 * real physical cpu the kernel booted onto, however
1186 * cpu_data() only has one entry at index 0.
1187 */
1188 if (cpuid != real_hard_smp_processor_id())
1189 return NULL;
1190 cpuid = 0;
1191 #endif
1192
1193 c = &cpu_data(cpuid);
1194 c->clock_tick = *cfreq;
1195
1196 tb = &trap_block[cpuid];
1197 get_mondo_data(hp, mp, tb);
1198
1199 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
1200 u64 j, t = mdesc_arc_target(hp, a);
1201 const char *t_name;
1202
1203 t_name = mdesc_node_name(hp, t);
1204 if (!strcmp(t_name, "cache")) {
1205 fill_in_one_cache(c, hp, t);
1206 continue;
1207 }
1208
1209 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
1210 u64 n = mdesc_arc_target(hp, j);
1211 const char *n_name;
1212
1213 n_name = mdesc_node_name(hp, n);
1214 if (!strcmp(n_name, "cache"))
1215 fill_in_one_cache(c, hp, n);
1216 }
1217 }
1218
1219 c->core_id = 0;
1220 c->proc_id = -1;
1221
1222 return NULL;
1223 }
1224
1225 void mdesc_fill_in_cpu_data(cpumask_t *mask)
1226 {
1227 struct mdesc_handle *hp;
1228
1229 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
1230
1231 hp = mdesc_grab();
1232
1233 set_core_ids(hp);
1234 set_proc_ids(hp);
1235 set_sock_ids(hp);
1236
1237 mdesc_release(hp);
1238
1239 smp_fill_in_sib_core_maps();
1240 }
1241
1242 /* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is
1243 * opened. Hold this reference until /dev/mdesc is closed to ensure
1244 * mdesc data structure is not released underneath us. Store the
1245 * pointer to mdesc structure in private_data for read and seek to use
1246 */
1247 static int mdesc_open(struct inode *inode, struct file *file)
1248 {
1249 struct mdesc_handle *hp = mdesc_grab();
1250
1251 if (!hp)
1252 return -ENODEV;
1253
1254 file->private_data = hp;
1255
1256 return 0;
1257 }
1258
1259 static ssize_t mdesc_read(struct file *file, char __user *buf,
1260 size_t len, loff_t *offp)
1261 {
1262 struct mdesc_handle *hp = file->private_data;
1263 unsigned char *mdesc;
1264 int bytes_left, count = len;
1265
1266 if (*offp >= hp->handle_size)
1267 return 0;
1268
1269 bytes_left = hp->handle_size - *offp;
1270 if (count > bytes_left)
1271 count = bytes_left;
1272
1273 mdesc = (unsigned char *)&hp->mdesc;
1274 mdesc += *offp;
1275 if (!copy_to_user(buf, mdesc, count)) {
1276 *offp += count;
1277 return count;
1278 } else {
1279 return -EFAULT;
1280 }
1281 }
1282
1283 static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
1284 {
1285 struct mdesc_handle *hp = file->private_data;
1286
1287 return no_seek_end_llseek_size(file, offset, whence, hp->handle_size);
1288 }
1289
1290 /* mdesc_close() - /dev/mdesc is being closed, release the reference to
1291 * mdesc structure.
1292 */
1293 static int mdesc_close(struct inode *inode, struct file *file)
1294 {
1295 mdesc_release(file->private_data);
1296 return 0;
1297 }
1298
1299 static const struct file_operations mdesc_fops = {
1300 .open = mdesc_open,
1301 .read = mdesc_read,
1302 .llseek = mdesc_llseek,
1303 .release = mdesc_close,
1304 .owner = THIS_MODULE,
1305 };
1306
1307 static struct miscdevice mdesc_misc = {
1308 .minor = MISC_DYNAMIC_MINOR,
1309 .name = "mdesc",
1310 .fops = &mdesc_fops,
1311 };
1312
1313 static int __init mdesc_misc_init(void)
1314 {
1315 return misc_register(&mdesc_misc);
1316 }
1317
1318 __initcall(mdesc_misc_init);
1319
1320 void __init sun4v_mdesc_init(void)
1321 {
1322 struct mdesc_handle *hp;
1323 unsigned long len, real_len, status;
1324
1325 (void) sun4v_mach_desc(0UL, 0UL, &len);
1326
1327 printk("MDESC: Size is %lu bytes.\n", len);
1328
1329 hp = mdesc_alloc(len, &memblock_mdesc_ops);
1330 if (hp == NULL) {
1331 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
1332 prom_halt();
1333 }
1334
1335 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
1336 if (status != HV_EOK || real_len > len) {
1337 prom_printf("sun4v_mach_desc fails, err(%lu), "
1338 "len(%lu), real_len(%lu)\n",
1339 status, len, real_len);
1340 mdesc_free(hp);
1341 prom_halt();
1342 }
1343
1344 cur_mdesc = hp;
1345
1346 report_platform_properties();
1347 }
Linux with added FPC-III support