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mtd: nand: omap: Fix comment in platform data using wrong Kconfig symbol
[linux/fpc-iii.git] / arch / sparc / kernel / mdesc.c
blob9a26b442f820c86b5df5cfd13efd309dea3d59cc
1 // SPDX-License-Identifier: GPL-2.0
2 /* mdesc.c: Sun4V machine description handling.
3 *
4 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
5 */
6 #include <linux/kernel.h>
7 #include <linux/types.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/memblock.h>
14 #include <linux/export.h>
15 #include <linux/refcount.h>
16
17 #include <asm/cpudata.h>
18 #include <asm/hypervisor.h>
19 #include <asm/mdesc.h>
20 #include <asm/prom.h>
21 #include <linux/uaccess.h>
22 #include <asm/oplib.h>
23 #include <asm/smp.h>
24 #include <asm/adi.h>
25
26 /* Unlike the OBP device tree, the machine description is a full-on
27 * DAG. An arbitrary number of ARCs are possible from one
28 * node to other nodes and thus we can't use the OBP device_node
29 * data structure to represent these nodes inside of the kernel.
30 *
31 * Actually, it isn't even a DAG, because there are back pointers
32 * which create cycles in the graph.
33 *
34 * mdesc_hdr and mdesc_elem describe the layout of the data structure
35 * we get from the Hypervisor.
36 */
37 struct mdesc_hdr {
38 u32 version; /* Transport version */
39 u32 node_sz; /* node block size */
40 u32 name_sz; /* name block size */
41 u32 data_sz; /* data block size */
42 } __attribute__((aligned(16)));
43
44 struct mdesc_elem {
45 u8 tag;
46 #define MD_LIST_END 0x00
47 #define MD_NODE 0x4e
48 #define MD_NODE_END 0x45
49 #define MD_NOOP 0x20
50 #define MD_PROP_ARC 0x61
51 #define MD_PROP_VAL 0x76
52 #define MD_PROP_STR 0x73
53 #define MD_PROP_DATA 0x64
54 u8 name_len;
55 u16 resv;
56 u32 name_offset;
57 union {
58 struct {
59 u32 data_len;
60 u32 data_offset;
61 } data;
62 u64 val;
63 } d;
64 };
65
66 struct mdesc_mem_ops {
67 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
68 void (*free)(struct mdesc_handle *handle);
69 };
70
71 struct mdesc_handle {
72 struct list_head list;
73 struct mdesc_mem_ops *mops;
74 void *self_base;
75 refcount_t refcnt;
76 unsigned int handle_size;
77 struct mdesc_hdr mdesc;
78 };
79
80 typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,
81 union md_node_info *);
82 typedef void (*mdesc_node_info_rel_f)(union md_node_info *);
83 typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);
84
85 struct md_node_ops {
86 char *name;
87 mdesc_node_info_get_f get_info;
88 mdesc_node_info_rel_f rel_info;
89 mdesc_node_match_f node_match;
90 };
91
92 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
93 union md_node_info *node_info);
94 static void rel_vdev_port_node_info(union md_node_info *node_info);
95 static bool vdev_port_node_match(union md_node_info *a_node_info,
96 union md_node_info *b_node_info);
97
98 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
99 union md_node_info *node_info);
100 static void rel_ds_port_node_info(union md_node_info *node_info);
101 static bool ds_port_node_match(union md_node_info *a_node_info,
102 union md_node_info *b_node_info);
103
104 /* supported node types which can be registered */
105 static struct md_node_ops md_node_ops_table[] = {
106 {"virtual-device-port", get_vdev_port_node_info,
107 rel_vdev_port_node_info, vdev_port_node_match},
108 {"domain-services-port", get_ds_port_node_info,
109 rel_ds_port_node_info, ds_port_node_match},
110 {NULL, NULL, NULL, NULL}
111 };
112
113 static void mdesc_get_node_ops(const char *node_name,
114 mdesc_node_info_get_f *get_info_f,
115 mdesc_node_info_rel_f *rel_info_f,
116 mdesc_node_match_f *match_f)
117 {
118 int i;
119
120 if (get_info_f)
121 *get_info_f = NULL;
122
123 if (rel_info_f)
124 *rel_info_f = NULL;
125
126 if (match_f)
127 *match_f = NULL;
128
129 if (!node_name)
130 return;
131
132 for (i = 0; md_node_ops_table[i].name != NULL; i++) {
133 if (strcmp(md_node_ops_table[i].name, node_name) == 0) {
134 if (get_info_f)
135 *get_info_f = md_node_ops_table[i].get_info;
136
137 if (rel_info_f)
138 *rel_info_f = md_node_ops_table[i].rel_info;
139
140 if (match_f)
141 *match_f = md_node_ops_table[i].node_match;
142
143 break;
144 }
145 }
146 }
147
148 static void mdesc_handle_init(struct mdesc_handle *hp,
149 unsigned int handle_size,
150 void *base)
151 {
152 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
153
154 memset(hp, 0, handle_size);
155 INIT_LIST_HEAD(&hp->list);
156 hp->self_base = base;
157 refcount_set(&hp->refcnt, 1);
158 hp->handle_size = handle_size;
159 }
160
161 static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
162 {
163 unsigned int handle_size, alloc_size;
164 struct mdesc_handle *hp;
165 unsigned long paddr;
166
167 handle_size = (sizeof(struct mdesc_handle) -
168 sizeof(struct mdesc_hdr) +
169 mdesc_size);
170 alloc_size = PAGE_ALIGN(handle_size);
171
172 paddr = memblock_phys_alloc(alloc_size, PAGE_SIZE);
173
174 hp = NULL;
175 if (paddr) {
176 hp = __va(paddr);
177 mdesc_handle_init(hp, handle_size, hp);
178 }
179 return hp;
180 }
181
182 static void __init mdesc_memblock_free(struct mdesc_handle *hp)
183 {
184 unsigned int alloc_size;
185 unsigned long start;
186
187 BUG_ON(refcount_read(&hp->refcnt) != 0);
188 BUG_ON(!list_empty(&hp->list));
189
190 alloc_size = PAGE_ALIGN(hp->handle_size);
191 start = __pa(hp);
192 memblock_free_late(start, alloc_size);
193 }
194
195 static struct mdesc_mem_ops memblock_mdesc_ops = {
196 .alloc = mdesc_memblock_alloc,
197 .free = mdesc_memblock_free,
198 };
199
200 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
201 {
202 unsigned int handle_size;
203 struct mdesc_handle *hp;
204 unsigned long addr;
205 void *base;
206
207 handle_size = (sizeof(struct mdesc_handle) -
208 sizeof(struct mdesc_hdr) +
209 mdesc_size);
210 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
211 if (!base)
212 return NULL;
213
214 addr = (unsigned long)base;
215 addr = (addr + 15UL) & ~15UL;
216 hp = (struct mdesc_handle *) addr;
217
218 mdesc_handle_init(hp, handle_size, base);
219
220 return hp;
221 }
222
223 static void mdesc_kfree(struct mdesc_handle *hp)
224 {
225 BUG_ON(refcount_read(&hp->refcnt) != 0);
226 BUG_ON(!list_empty(&hp->list));
227
228 kfree(hp->self_base);
229 }
230
231 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
232 .alloc = mdesc_kmalloc,
233 .free = mdesc_kfree,
234 };
235
236 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
237 struct mdesc_mem_ops *mops)
238 {
239 struct mdesc_handle *hp = mops->alloc(mdesc_size);
240
241 if (hp)
242 hp->mops = mops;
243
244 return hp;
245 }
246
247 static void mdesc_free(struct mdesc_handle *hp)
248 {
249 hp->mops->free(hp);
250 }
251
252 static struct mdesc_handle *cur_mdesc;
253 static LIST_HEAD(mdesc_zombie_list);
254 static DEFINE_SPINLOCK(mdesc_lock);
255
256 struct mdesc_handle *mdesc_grab(void)
257 {
258 struct mdesc_handle *hp;
259 unsigned long flags;
260
261 spin_lock_irqsave(&mdesc_lock, flags);
262 hp = cur_mdesc;
263 if (hp)
264 refcount_inc(&hp->refcnt);
265 spin_unlock_irqrestore(&mdesc_lock, flags);
266
267 return hp;
268 }
269 EXPORT_SYMBOL(mdesc_grab);
270
271 void mdesc_release(struct mdesc_handle *hp)
272 {
273 unsigned long flags;
274
275 spin_lock_irqsave(&mdesc_lock, flags);
276 if (refcount_dec_and_test(&hp->refcnt)) {
277 list_del_init(&hp->list);
278 hp->mops->free(hp);
279 }
280 spin_unlock_irqrestore(&mdesc_lock, flags);
281 }
282 EXPORT_SYMBOL(mdesc_release);
283
284 static DEFINE_MUTEX(mdesc_mutex);
285 static struct mdesc_notifier_client *client_list;
286
287 void mdesc_register_notifier(struct mdesc_notifier_client *client)
288 {
289 bool supported = false;
290 u64 node;
291 int i;
292
293 mutex_lock(&mdesc_mutex);
294
295 /* check to see if the node is supported for registration */
296 for (i = 0; md_node_ops_table[i].name != NULL; i++) {
297 if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) {
298 supported = true;
299 break;
300 }
301 }
302
303 if (!supported) {
304 pr_err("MD: %s node not supported\n", client->node_name);
305 mutex_unlock(&mdesc_mutex);
306 return;
307 }
308
309 client->next = client_list;
310 client_list = client;
311
312 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
313 client->add(cur_mdesc, node, client->node_name);
314
315 mutex_unlock(&mdesc_mutex);
316 }
317
318 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
319 {
320 const u64 *id;
321 u64 a;
322
323 id = NULL;
324 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
325 u64 target;
326
327 target = mdesc_arc_target(hp, a);
328 id = mdesc_get_property(hp, target,
329 "cfg-handle", NULL);
330 if (id)
331 break;
332 }
333
334 return id;
335 }
336
337 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
338 union md_node_info *node_info)
339 {
340 const u64 *parent_cfg_hdlp;
341 const char *name;
342 const u64 *idp;
343
344 /*
345 * Virtual device nodes are distinguished by:
346 * 1. "id" property
347 * 2. "name" property
348 * 3. parent node "cfg-handle" property
349 */
350 idp = mdesc_get_property(md, node, "id", NULL);
351 name = mdesc_get_property(md, node, "name", NULL);
352 parent_cfg_hdlp = parent_cfg_handle(md, node);
353
354 if (!idp || !name || !parent_cfg_hdlp)
355 return -1;
356
357 node_info->vdev_port.id = *idp;
358 node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL);
359 node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp;
360
361 return 0;
362 }
363
364 static void rel_vdev_port_node_info(union md_node_info *node_info)
365 {
366 if (node_info && node_info->vdev_port.name) {
367 kfree_const(node_info->vdev_port.name);
368 node_info->vdev_port.name = NULL;
369 }
370 }
371
372 static bool vdev_port_node_match(union md_node_info *a_node_info,
373 union md_node_info *b_node_info)
374 {
375 if (a_node_info->vdev_port.id != b_node_info->vdev_port.id)
376 return false;
377
378 if (a_node_info->vdev_port.parent_cfg_hdl !=
379 b_node_info->vdev_port.parent_cfg_hdl)
380 return false;
381
382 if (strncmp(a_node_info->vdev_port.name,
383 b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0)
384 return false;
385
386 return true;
387 }
388
389 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
390 union md_node_info *node_info)
391 {
392 const u64 *idp;
393
394 /* DS port nodes use the "id" property to distinguish them */
395 idp = mdesc_get_property(md, node, "id", NULL);
396 if (!idp)
397 return -1;
398
399 node_info->ds_port.id = *idp;
400
401 return 0;
402 }
403
404 static void rel_ds_port_node_info(union md_node_info *node_info)
405 {
406 }
407
408 static bool ds_port_node_match(union md_node_info *a_node_info,
409 union md_node_info *b_node_info)
410 {
411 if (a_node_info->ds_port.id != b_node_info->ds_port.id)
412 return false;
413
414 return true;
415 }
416
417 /* Run 'func' on nodes which are in A but not in B. */
418 static void invoke_on_missing(const char *name,
419 struct mdesc_handle *a,
420 struct mdesc_handle *b,
421 void (*func)(struct mdesc_handle *, u64,
422 const char *node_name))
423 {
424 mdesc_node_info_get_f get_info_func;
425 mdesc_node_info_rel_f rel_info_func;
426 mdesc_node_match_f node_match_func;
427 union md_node_info a_node_info;
428 union md_node_info b_node_info;
429 bool found;
430 u64 a_node;
431 u64 b_node;
432 int rv;
433
434 /*
435 * Find the get_info, rel_info and node_match ops for the given
436 * node name
437 */
438 mdesc_get_node_ops(name, &get_info_func, &rel_info_func,
439 &node_match_func);
440
441 /* If we didn't find a match, the node type is not supported */
442 if (!get_info_func || !rel_info_func || !node_match_func) {
443 pr_err("MD: %s node type is not supported\n", name);
444 return;
445 }
446
447 mdesc_for_each_node_by_name(a, a_node, name) {
448 found = false;
449
450 rv = get_info_func(a, a_node, &a_node_info);
451 if (rv != 0) {
452 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
453 name);
454 continue;
455 }
456
457 /* Check each node in B for node matching a_node */
458 mdesc_for_each_node_by_name(b, b_node, name) {
459 rv = get_info_func(b, b_node, &b_node_info);
460 if (rv != 0)
461 continue;
462
463 if (node_match_func(&a_node_info, &b_node_info)) {
464 found = true;
465 rel_info_func(&b_node_info);
466 break;
467 }
468
469 rel_info_func(&b_node_info);
470 }
471
472 rel_info_func(&a_node_info);
473
474 if (!found)
475 func(a, a_node, name);
476 }
477 }
478
479 static void notify_one(struct mdesc_notifier_client *p,
480 struct mdesc_handle *old_hp,
481 struct mdesc_handle *new_hp)
482 {
483 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
484 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
485 }
486
487 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
488 struct mdesc_handle *new_hp)
489 {
490 struct mdesc_notifier_client *p = client_list;
491
492 while (p) {
493 notify_one(p, old_hp, new_hp);
494 p = p->next;
495 }
496 }
497
498 void mdesc_update(void)
499 {
500 unsigned long len, real_len, status;
501 struct mdesc_handle *hp, *orig_hp;
502 unsigned long flags;
503
504 mutex_lock(&mdesc_mutex);
505
506 (void) sun4v_mach_desc(0UL, 0UL, &len);
507
508 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
509 if (!hp) {
510 printk(KERN_ERR "MD: mdesc alloc fails\n");
511 goto out;
512 }
513
514 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
515 if (status != HV_EOK || real_len > len) {
516 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
517 status);
518 refcount_dec(&hp->refcnt);
519 mdesc_free(hp);
520 goto out;
521 }
522
523 spin_lock_irqsave(&mdesc_lock, flags);
524 orig_hp = cur_mdesc;
525 cur_mdesc = hp;
526 spin_unlock_irqrestore(&mdesc_lock, flags);
527
528 mdesc_notify_clients(orig_hp, hp);
529
530 spin_lock_irqsave(&mdesc_lock, flags);
531 if (refcount_dec_and_test(&orig_hp->refcnt))
532 mdesc_free(orig_hp);
533 else
534 list_add(&orig_hp->list, &mdesc_zombie_list);
535 spin_unlock_irqrestore(&mdesc_lock, flags);
536
537 out:
538 mutex_unlock(&mdesc_mutex);
539 }
540
541 u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
542 union md_node_info *node_info)
543 {
544 mdesc_node_info_get_f get_info_func;
545 mdesc_node_info_rel_f rel_info_func;
546 mdesc_node_match_f node_match_func;
547 union md_node_info hp_node_info;
548 u64 hp_node;
549 int rv;
550
551 if (hp == NULL || node_name == NULL || node_info == NULL)
552 return MDESC_NODE_NULL;
553
554 /* Find the ops for the given node name */
555 mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func,
556 &node_match_func);
557
558 /* If we didn't find ops for the given node name, it is not supported */
559 if (!get_info_func || !rel_info_func || !node_match_func) {
560 pr_err("MD: %s node is not supported\n", node_name);
561 return -EINVAL;
562 }
563
564 mdesc_for_each_node_by_name(hp, hp_node, node_name) {
565 rv = get_info_func(hp, hp_node, &hp_node_info);
566 if (rv != 0)
567 continue;
568
569 if (node_match_func(node_info, &hp_node_info))
570 break;
571
572 rel_info_func(&hp_node_info);
573 }
574
575 rel_info_func(&hp_node_info);
576
577 return hp_node;
578 }
579 EXPORT_SYMBOL(mdesc_get_node);
580
581 int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
582 const char *node_name, union md_node_info *node_info)
583 {
584 mdesc_node_info_get_f get_info_func;
585 int rv;
586
587 if (hp == NULL || node == MDESC_NODE_NULL ||
588 node_name == NULL || node_info == NULL)
589 return -EINVAL;
590
591 /* Find the get_info op for the given node name */
592 mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL);
593
594 /* If we didn't find a get_info_func, the node name is not supported */
595 if (get_info_func == NULL) {
596 pr_err("MD: %s node is not supported\n", node_name);
597 return -EINVAL;
598 }
599
600 rv = get_info_func(hp, node, node_info);
601 if (rv != 0) {
602 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
603 node_name);
604 return -1;
605 }
606
607 return 0;
608 }
609 EXPORT_SYMBOL(mdesc_get_node_info);
610
611 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
612 {
613 return (struct mdesc_elem *) (mdesc + 1);
614 }
615
616 static void *name_block(struct mdesc_hdr *mdesc)
617 {
618 return ((void *) node_block(mdesc)) + mdesc->node_sz;
619 }
620
621 static void *data_block(struct mdesc_hdr *mdesc)
622 {
623 return ((void *) name_block(mdesc)) + mdesc->name_sz;
624 }
625
626 u64 mdesc_node_by_name(struct mdesc_handle *hp,
627 u64 from_node, const char *name)
628 {
629 struct mdesc_elem *ep = node_block(&hp->mdesc);
630 const char *names = name_block(&hp->mdesc);
631 u64 last_node = hp->mdesc.node_sz / 16;
632 u64 ret;
633
634 if (from_node == MDESC_NODE_NULL) {
635 ret = from_node = 0;
636 } else if (from_node >= last_node) {
637 return MDESC_NODE_NULL;
638 } else {
639 ret = ep[from_node].d.val;
640 }
641
642 while (ret < last_node) {
643 if (ep[ret].tag != MD_NODE)
644 return MDESC_NODE_NULL;
645 if (!strcmp(names + ep[ret].name_offset, name))
646 break;
647 ret = ep[ret].d.val;
648 }
649 if (ret >= last_node)
650 ret = MDESC_NODE_NULL;
651 return ret;
652 }
653 EXPORT_SYMBOL(mdesc_node_by_name);
654
655 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
656 const char *name, int *lenp)
657 {
658 const char *names = name_block(&hp->mdesc);
659 u64 last_node = hp->mdesc.node_sz / 16;
660 void *data = data_block(&hp->mdesc);
661 struct mdesc_elem *ep;
662
663 if (node == MDESC_NODE_NULL || node >= last_node)
664 return NULL;
665
666 ep = node_block(&hp->mdesc) + node;
667 ep++;
668 for (; ep->tag != MD_NODE_END; ep++) {
669 void *val = NULL;
670 int len = 0;
671
672 switch (ep->tag) {
673 case MD_PROP_VAL:
674 val = &ep->d.val;
675 len = 8;
676 break;
677
678 case MD_PROP_STR:
679 case MD_PROP_DATA:
680 val = data + ep->d.data.data_offset;
681 len = ep->d.data.data_len;
682 break;
683
684 default:
685 break;
686 }
687 if (!val)
688 continue;
689
690 if (!strcmp(names + ep->name_offset, name)) {
691 if (lenp)
692 *lenp = len;
693 return val;
694 }
695 }
696
697 return NULL;
698 }
699 EXPORT_SYMBOL(mdesc_get_property);
700
701 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
702 {
703 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
704 const char *names = name_block(&hp->mdesc);
705 u64 last_node = hp->mdesc.node_sz / 16;
706
707 if (from == MDESC_NODE_NULL || from >= last_node)
708 return MDESC_NODE_NULL;
709
710 ep = base + from;
711
712 ep++;
713 for (; ep->tag != MD_NODE_END; ep++) {
714 if (ep->tag != MD_PROP_ARC)
715 continue;
716
717 if (strcmp(names + ep->name_offset, arc_type))
718 continue;
719
720 return ep - base;
721 }
722
723 return MDESC_NODE_NULL;
724 }
725 EXPORT_SYMBOL(mdesc_next_arc);
726
727 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
728 {
729 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
730
731 ep = base + arc;
732
733 return ep->d.val;
734 }
735 EXPORT_SYMBOL(mdesc_arc_target);
736
737 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
738 {
739 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
740 const char *names = name_block(&hp->mdesc);
741 u64 last_node = hp->mdesc.node_sz / 16;
742
743 if (node == MDESC_NODE_NULL || node >= last_node)
744 return NULL;
745
746 ep = base + node;
747 if (ep->tag != MD_NODE)
748 return NULL;
749
750 return names + ep->name_offset;
751 }
752 EXPORT_SYMBOL(mdesc_node_name);
753
754 static u64 max_cpus = 64;
755
756 static void __init report_platform_properties(void)
757 {
758 struct mdesc_handle *hp = mdesc_grab();
759 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
760 const char *s;
761 const u64 *v;
762
763 if (pn == MDESC_NODE_NULL) {
764 prom_printf("No platform node in machine-description.\n");
765 prom_halt();
766 }
767
768 s = mdesc_get_property(hp, pn, "banner-name", NULL);
769 printk("PLATFORM: banner-name [%s]\n", s);
770 s = mdesc_get_property(hp, pn, "name", NULL);
771 printk("PLATFORM: name [%s]\n", s);
772
773 v = mdesc_get_property(hp, pn, "hostid", NULL);
774 if (v)
775 printk("PLATFORM: hostid [%08llx]\n", *v);
776 v = mdesc_get_property(hp, pn, "serial#", NULL);
777 if (v)
778 printk("PLATFORM: serial# [%08llx]\n", *v);
779 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
780 printk("PLATFORM: stick-frequency [%08llx]\n", *v);
781 v = mdesc_get_property(hp, pn, "mac-address", NULL);
782 if (v)
783 printk("PLATFORM: mac-address [%llx]\n", *v);
784 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
785 if (v)
786 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
787 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
788 if (v)
789 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
790 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
791 if (v) {
792 max_cpus = *v;
793 printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
794 }
795
796 #ifdef CONFIG_SMP
797 {
798 int max_cpu, i;
799
800 if (v) {
801 max_cpu = *v;
802 if (max_cpu > NR_CPUS)
803 max_cpu = NR_CPUS;
804 } else {
805 max_cpu = NR_CPUS;
806 }
807 for (i = 0; i < max_cpu; i++)
808 set_cpu_possible(i, true);
809 }
810 #endif
811
812 mdesc_release(hp);
813 }
814
815 static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp)
816 {
817 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
818 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
819 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
820 const char *type;
821 int type_len;
822
823 type = mdesc_get_property(hp, mp, "type", &type_len);
824
825 switch (*level) {
826 case 1:
827 if (of_find_in_proplist(type, "instn", type_len)) {
828 c->icache_size = *size;
829 c->icache_line_size = *line_size;
830 } else if (of_find_in_proplist(type, "data", type_len)) {
831 c->dcache_size = *size;
832 c->dcache_line_size = *line_size;
833 }
834 break;
835
836 case 2:
837 c->ecache_size = *size;
838 c->ecache_line_size = *line_size;
839 break;
840
841 default:
842 break;
843 }
844
845 if (*level == 1) {
846 u64 a;
847
848 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
849 u64 target = mdesc_arc_target(hp, a);
850 const char *name = mdesc_node_name(hp, target);
851
852 if (!strcmp(name, "cache"))
853 fill_in_one_cache(c, hp, target);
854 }
855 }
856 }
857
858 static void find_back_node_value(struct mdesc_handle *hp, u64 node,
859 char *srch_val,
860 void (*func)(struct mdesc_handle *, u64, int),
861 u64 val, int depth)
862 {
863 u64 arc;
864
865 /* Since we have an estimate of recursion depth, do a sanity check. */
866 if (depth == 0)
867 return;
868
869 mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) {
870 u64 n = mdesc_arc_target(hp, arc);
871 const char *name = mdesc_node_name(hp, n);
872
873 if (!strcmp(srch_val, name))
874 (*func)(hp, n, val);
875
876 find_back_node_value(hp, n, srch_val, func, val, depth-1);
877 }
878 }
879
880 static void __mark_core_id(struct mdesc_handle *hp, u64 node,
881 int core_id)
882 {
883 const u64 *id = mdesc_get_property(hp, node, "id", NULL);
884
885 if (*id < num_possible_cpus())
886 cpu_data(*id).core_id = core_id;
887 }
888
889 static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node,
890 int max_cache_id)
891 {
892 const u64 *id = mdesc_get_property(hp, node, "id", NULL);
893
894 if (*id < num_possible_cpus()) {
895 cpu_data(*id).max_cache_id = max_cache_id;
896
897 /**
898 * On systems without explicit socket descriptions socket
899 * is max_cache_id
900 */
901 cpu_data(*id).sock_id = max_cache_id;
902 }
903 }
904
905 static void mark_core_ids(struct mdesc_handle *hp, u64 mp,
906 int core_id)
907 {
908 find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10);
909 }
910
911 static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp,
912 int max_cache_id)
913 {
914 find_back_node_value(hp, mp, "cpu", __mark_max_cache_id,
915 max_cache_id, 10);
916 }
917
918 static void set_core_ids(struct mdesc_handle *hp)
919 {
920 int idx;
921 u64 mp;
922
923 idx = 1;
924
925 /* Identify unique cores by looking for cpus backpointed to by
926 * level 1 instruction caches.
927 */
928 mdesc_for_each_node_by_name(hp, mp, "cache") {
929 const u64 *level;
930 const char *type;
931 int len;
932
933 level = mdesc_get_property(hp, mp, "level", NULL);
934 if (*level != 1)
935 continue;
936
937 type = mdesc_get_property(hp, mp, "type", &len);
938 if (!of_find_in_proplist(type, "instn", len))
939 continue;
940
941 mark_core_ids(hp, mp, idx);
942 idx++;
943 }
944 }
945
946 static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level)
947 {
948 u64 mp;
949 int idx = 1;
950 int fnd = 0;
951
952 /**
953 * Identify unique highest level of shared cache by looking for cpus
954 * backpointed to by shared level N caches.
955 */
956 mdesc_for_each_node_by_name(hp, mp, "cache") {
957 const u64 *cur_lvl;
958
959 cur_lvl = mdesc_get_property(hp, mp, "level", NULL);
960 if (*cur_lvl != level)
961 continue;
962 mark_max_cache_ids(hp, mp, idx);
963 idx++;
964 fnd = 1;
965 }
966 return fnd;
967 }
968
969 static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp)
970 {
971 int idx = 1;
972
973 mdesc_for_each_node_by_name(hp, mp, "socket") {
974 u64 a;
975
976 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
977 u64 t = mdesc_arc_target(hp, a);
978 const char *name;
979 const u64 *id;
980
981 name = mdesc_node_name(hp, t);
982 if (strcmp(name, "cpu"))
983 continue;
984
985 id = mdesc_get_property(hp, t, "id", NULL);
986 if (*id < num_possible_cpus())
987 cpu_data(*id).sock_id = idx;
988 }
989 idx++;
990 }
991 }
992
993 static void set_sock_ids(struct mdesc_handle *hp)
994 {
995 u64 mp;
996
997 /**
998 * Find the highest level of shared cache which pre-T7 is also
999 * the socket.
1000 */
1001 if (!set_max_cache_ids_by_cache(hp, 3))
1002 set_max_cache_ids_by_cache(hp, 2);
1003
1004 /* If machine description exposes sockets data use it.*/
1005 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets");
1006 if (mp != MDESC_NODE_NULL)
1007 set_sock_ids_by_socket(hp, mp);
1008 }
1009
1010 static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
1011 {
1012 u64 a;
1013
1014 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
1015 u64 t = mdesc_arc_target(hp, a);
1016 const char *name;
1017 const u64 *id;
1018
1019 name = mdesc_node_name(hp, t);
1020 if (strcmp(name, "cpu"))
1021 continue;
1022
1023 id = mdesc_get_property(hp, t, "id", NULL);
1024 if (*id < NR_CPUS)
1025 cpu_data(*id).proc_id = proc_id;
1026 }
1027 }
1028
1029 static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
1030 {
1031 int idx;
1032 u64 mp;
1033
1034 idx = 0;
1035 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
1036 const char *type;
1037 int len;
1038
1039 type = mdesc_get_property(hp, mp, "type", &len);
1040 if (!of_find_in_proplist(type, "int", len) &&
1041 !of_find_in_proplist(type, "integer", len))
1042 continue;
1043
1044 mark_proc_ids(hp, mp, idx);
1045 idx++;
1046 }
1047 }
1048
1049 static void set_proc_ids(struct mdesc_handle *hp)
1050 {
1051 __set_proc_ids(hp, "exec_unit");
1052 __set_proc_ids(hp, "exec-unit");
1053 }
1054
1055 static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
1056 unsigned long def, unsigned long max)
1057 {
1058 u64 val;
1059
1060 if (!p)
1061 goto use_default;
1062 val = *p;
1063
1064 if (!val || val >= 64)
1065 goto use_default;
1066
1067 if (val > max)
1068 val = max;
1069
1070 *mask = ((1U << val) * 64U) - 1U;
1071 return;
1072
1073 use_default:
1074 *mask = ((1U << def) * 64U) - 1U;
1075 }
1076
1077 static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
1078 struct trap_per_cpu *tb)
1079 {
1080 static int printed;
1081 const u64 *val;
1082
1083 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
1084 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
1085
1086 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
1087 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
1088
1089 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
1090 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
1091
1092 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
1093 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
1094 if (!printed++) {
1095 pr_info("SUN4V: Mondo queue sizes "
1096 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
1097 tb->cpu_mondo_qmask + 1,
1098 tb->dev_mondo_qmask + 1,
1099 tb->resum_qmask + 1,
1100 tb->nonresum_qmask + 1);
1101 }
1102 }
1103
1104 static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
1105 {
1106 struct mdesc_handle *hp = mdesc_grab();
1107 void *ret = NULL;
1108 u64 mp;
1109
1110 mdesc_for_each_node_by_name(hp, mp, "cpu") {
1111 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
1112 int cpuid = *id;
1113
1114 #ifdef CONFIG_SMP
1115 if (cpuid >= NR_CPUS) {
1116 printk(KERN_WARNING "Ignoring CPU %d which is "
1117 ">= NR_CPUS (%d)\n",
1118 cpuid, NR_CPUS);
1119 continue;
1120 }
1121 if (!cpumask_test_cpu(cpuid, mask))
1122 continue;
1123 #endif
1124
1125 ret = func(hp, mp, cpuid, arg);
1126 if (ret)
1127 goto out;
1128 }
1129 out:
1130 mdesc_release(hp);
1131 return ret;
1132 }
1133
1134 static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
1135 void *arg)
1136 {
1137 ncpus_probed++;
1138 #ifdef CONFIG_SMP
1139 set_cpu_present(cpuid, true);
1140 #endif
1141 return NULL;
1142 }
1143
1144 void mdesc_populate_present_mask(cpumask_t *mask)
1145 {
1146 if (tlb_type != hypervisor)
1147 return;
1148
1149 ncpus_probed = 0;
1150 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
1151 }
1152
1153 static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
1154 {
1155 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
1156 unsigned long *pgsz_mask = arg;
1157 u64 val;
1158
1159 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
1160 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
1161 if (pgsz_prop)
1162 val = *pgsz_prop;
1163
1164 if (!*pgsz_mask)
1165 *pgsz_mask = val;
1166 else
1167 *pgsz_mask &= val;
1168 return NULL;
1169 }
1170
1171 void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
1172 {
1173 *pgsz_mask = 0;
1174 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
1175 }
1176
1177 static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
1178 void *arg)
1179 {
1180 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
1181 struct trap_per_cpu *tb;
1182 cpuinfo_sparc *c;
1183 u64 a;
1184
1185 #ifndef CONFIG_SMP
1186 /* On uniprocessor we only want the values for the
1187 * real physical cpu the kernel booted onto, however
1188 * cpu_data() only has one entry at index 0.
1189 */
1190 if (cpuid != real_hard_smp_processor_id())
1191 return NULL;
1192 cpuid = 0;
1193 #endif
1194
1195 c = &cpu_data(cpuid);
1196 c->clock_tick = *cfreq;
1197
1198 tb = &trap_block[cpuid];
1199 get_mondo_data(hp, mp, tb);
1200
1201 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
1202 u64 j, t = mdesc_arc_target(hp, a);
1203 const char *t_name;
1204
1205 t_name = mdesc_node_name(hp, t);
1206 if (!strcmp(t_name, "cache")) {
1207 fill_in_one_cache(c, hp, t);
1208 continue;
1209 }
1210
1211 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
1212 u64 n = mdesc_arc_target(hp, j);
1213 const char *n_name;
1214
1215 n_name = mdesc_node_name(hp, n);
1216 if (!strcmp(n_name, "cache"))
1217 fill_in_one_cache(c, hp, n);
1218 }
1219 }
1220
1221 c->core_id = 0;
1222 c->proc_id = -1;
1223
1224 return NULL;
1225 }
1226
1227 void mdesc_fill_in_cpu_data(cpumask_t *mask)
1228 {
1229 struct mdesc_handle *hp;
1230
1231 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
1232
1233 hp = mdesc_grab();
1234
1235 set_core_ids(hp);
1236 set_proc_ids(hp);
1237 set_sock_ids(hp);
1238
1239 mdesc_release(hp);
1240
1241 smp_fill_in_sib_core_maps();
1242 }
1243
1244 /* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is
1245 * opened. Hold this reference until /dev/mdesc is closed to ensure
1246 * mdesc data structure is not released underneath us. Store the
1247 * pointer to mdesc structure in private_data for read and seek to use
1248 */
1249 static int mdesc_open(struct inode *inode, struct file *file)
1250 {
1251 struct mdesc_handle *hp = mdesc_grab();
1252
1253 if (!hp)
1254 return -ENODEV;
1255
1256 file->private_data = hp;
1257
1258 return 0;
1259 }
1260
1261 static ssize_t mdesc_read(struct file *file, char __user *buf,
1262 size_t len, loff_t *offp)
1263 {
1264 struct mdesc_handle *hp = file->private_data;
1265 unsigned char *mdesc;
1266 int bytes_left, count = len;
1267
1268 if (*offp >= hp->handle_size)
1269 return 0;
1270
1271 bytes_left = hp->handle_size - *offp;
1272 if (count > bytes_left)
1273 count = bytes_left;
1274
1275 mdesc = (unsigned char *)&hp->mdesc;
1276 mdesc += *offp;
1277 if (!copy_to_user(buf, mdesc, count)) {
1278 *offp += count;
1279 return count;
1280 } else {
1281 return -EFAULT;
1282 }
1283 }
1284
1285 static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
1286 {
1287 struct mdesc_handle *hp = file->private_data;
1288
1289 return no_seek_end_llseek_size(file, offset, whence, hp->handle_size);
1290 }
1291
1292 /* mdesc_close() - /dev/mdesc is being closed, release the reference to
1293 * mdesc structure.
1294 */
1295 static int mdesc_close(struct inode *inode, struct file *file)
1296 {
1297 mdesc_release(file->private_data);
1298 return 0;
1299 }
1300
1301 static const struct file_operations mdesc_fops = {
1302 .open = mdesc_open,
1303 .read = mdesc_read,
1304 .llseek = mdesc_llseek,
1305 .release = mdesc_close,
1306 .owner = THIS_MODULE,
1307 };
1308
1309 static struct miscdevice mdesc_misc = {
1310 .minor = MISC_DYNAMIC_MINOR,
1311 .name = "mdesc",
1312 .fops = &mdesc_fops,
1313 };
1314
1315 static int __init mdesc_misc_init(void)
1316 {
1317 return misc_register(&mdesc_misc);
1318 }
1319
1320 __initcall(mdesc_misc_init);
1321
1322 void __init sun4v_mdesc_init(void)
1323 {
1324 struct mdesc_handle *hp;
1325 unsigned long len, real_len, status;
1326
1327 (void) sun4v_mach_desc(0UL, 0UL, &len);
1328
1329 printk("MDESC: Size is %lu bytes.\n", len);
1330
1331 hp = mdesc_alloc(len, &memblock_mdesc_ops);
1332 if (hp == NULL) {
1333 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
1334 prom_halt();
1335 }
1336
1337 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
1338 if (status != HV_EOK || real_len > len) {
1339 prom_printf("sun4v_mach_desc fails, err(%lu), "
1340 "len(%lu), real_len(%lu)\n",
1341 status, len, real_len);
1342 mdesc_free(hp);
1343 prom_halt();
1344 }
1345
1346 cur_mdesc = hp;
1347
1348 mdesc_adi_init();
1349 report_platform_properties();
1350 }
Linux with added FPC-III support