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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/memblock.h>
9#include <linux/log2.h>
10#include <linux/list.h>
11#include <linux/slab.h>
12#include <linux/mm.h>
13#include <linux/miscdevice.h>
14#include <linux/bootmem.h>
15#include <linux/export.h>
16#include <linux/refcount.h>
17
18#include <asm/cpudata.h>
19#include <asm/hypervisor.h>
20#include <asm/mdesc.h>
21#include <asm/prom.h>
22#include <linux/uaccess.h>
23#include <asm/oplib.h>
24#include <asm/smp.h>
25#include <asm/adi.h>
26
27/* Unlike the OBP device tree, the machine description is a full-on
28 * DAG. An arbitrary number of ARCs are possible from one
29 * node to other nodes and thus we can't use the OBP device_node
30 * data structure to represent these nodes inside of the kernel.
31 *
32 * Actually, it isn't even a DAG, because there are back pointers
33 * which create cycles in the graph.
34 *
35 * mdesc_hdr and mdesc_elem describe the layout of the data structure
36 * we get from the Hypervisor.
37 */
38struct mdesc_hdr {
39 u32 version; /* Transport version */
40 u32 node_sz; /* node block size */
41 u32 name_sz; /* name block size */
42 u32 data_sz; /* data block size */
43} __attribute__((aligned(16)));
44
45struct mdesc_elem {
46 u8 tag;
47#define MD_LIST_END 0x00
48#define MD_NODE 0x4e
49#define MD_NODE_END 0x45
50#define MD_NOOP 0x20
51#define MD_PROP_ARC 0x61
52#define MD_PROP_VAL 0x76
53#define MD_PROP_STR 0x73
54#define MD_PROP_DATA 0x64
55 u8 name_len;
56 u16 resv;
57 u32 name_offset;
58 union {
59 struct {
60 u32 data_len;
61 u32 data_offset;
62 } data;
63 u64 val;
64 } d;
65};
66
67struct mdesc_mem_ops {
68 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
69 void (*free)(struct mdesc_handle *handle);
70};
71
72struct mdesc_handle {
73 struct list_head list;
74 struct mdesc_mem_ops *mops;
75 void *self_base;
76 refcount_t refcnt;
77 unsigned int handle_size;
78 struct mdesc_hdr mdesc;
79};
80
81typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,
82 union md_node_info *);
83typedef void (*mdesc_node_info_rel_f)(union md_node_info *);
84typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);
85
86struct md_node_ops {
87 char *name;
88 mdesc_node_info_get_f get_info;
89 mdesc_node_info_rel_f rel_info;
90 mdesc_node_match_f node_match;
91};
92
93static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
94 union md_node_info *node_info);
95static void rel_vdev_port_node_info(union md_node_info *node_info);
96static bool vdev_port_node_match(union md_node_info *a_node_info,
97 union md_node_info *b_node_info);
98
99static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
100 union md_node_info *node_info);
101static void rel_ds_port_node_info(union md_node_info *node_info);
102static bool ds_port_node_match(union md_node_info *a_node_info,
103 union md_node_info *b_node_info);
104
105/* supported node types which can be registered */
106static struct md_node_ops md_node_ops_table[] = {
107 {"virtual-device-port", get_vdev_port_node_info,
108 rel_vdev_port_node_info, vdev_port_node_match},
109 {"domain-services-port", get_ds_port_node_info,
110 rel_ds_port_node_info, ds_port_node_match},
111 {NULL, NULL, NULL, NULL}
112};
113
114static void mdesc_get_node_ops(const char *node_name,
115 mdesc_node_info_get_f *get_info_f,
116 mdesc_node_info_rel_f *rel_info_f,
117 mdesc_node_match_f *match_f)
118{
119 int i;
120
121 if (get_info_f)
122 *get_info_f = NULL;
123
124 if (rel_info_f)
125 *rel_info_f = NULL;
126
127 if (match_f)
128 *match_f = NULL;
129
130 if (!node_name)
131 return;
132
133 for (i = 0; md_node_ops_table[i].name != NULL; i++) {
134 if (strcmp(md_node_ops_table[i].name, node_name) == 0) {
135 if (get_info_f)
136 *get_info_f = md_node_ops_table[i].get_info;
137
138 if (rel_info_f)
139 *rel_info_f = md_node_ops_table[i].rel_info;
140
141 if (match_f)
142 *match_f = md_node_ops_table[i].node_match;
143
144 break;
145 }
146 }
147}
148
149static void mdesc_handle_init(struct mdesc_handle *hp,
150 unsigned int handle_size,
151 void *base)
152{
153 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
154
155 memset(hp, 0, handle_size);
156 INIT_LIST_HEAD(&hp->list);
157 hp->self_base = base;
158 refcount_set(&hp->refcnt, 1);
159 hp->handle_size = handle_size;
160}
161
162static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
163{
164 unsigned int handle_size, alloc_size;
165 struct mdesc_handle *hp;
166 unsigned long paddr;
167
168 handle_size = (sizeof(struct mdesc_handle) -
169 sizeof(struct mdesc_hdr) +
170 mdesc_size);
171 alloc_size = PAGE_ALIGN(handle_size);
172
173 paddr = memblock_alloc(alloc_size, PAGE_SIZE);
174
175 hp = NULL;
176 if (paddr) {
177 hp = __va(paddr);
178 mdesc_handle_init(hp, handle_size, hp);
179 }
180 return hp;
181}
182
183static void __init mdesc_memblock_free(struct mdesc_handle *hp)
184{
185 unsigned int alloc_size;
186 unsigned long start;
187
188 BUG_ON(refcount_read(&hp->refcnt) != 0);
189 BUG_ON(!list_empty(&hp->list));
190
191 alloc_size = PAGE_ALIGN(hp->handle_size);
192 start = __pa(hp);
193 free_bootmem_late(start, alloc_size);
194}
195
196static struct mdesc_mem_ops memblock_mdesc_ops = {
197 .alloc = mdesc_memblock_alloc,
198 .free = mdesc_memblock_free,
199};
200
201static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
202{
203 unsigned int handle_size;
204 struct mdesc_handle *hp;
205 unsigned long addr;
206 void *base;
207
208 handle_size = (sizeof(struct mdesc_handle) -
209 sizeof(struct mdesc_hdr) +
210 mdesc_size);
211 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
212 if (!base)
213 return NULL;
214
215 addr = (unsigned long)base;
216 addr = (addr + 15UL) & ~15UL;
217 hp = (struct mdesc_handle *) addr;
218
219 mdesc_handle_init(hp, handle_size, base);
220
221 return hp;
222}
223
224static void mdesc_kfree(struct mdesc_handle *hp)
225{
226 BUG_ON(refcount_read(&hp->refcnt) != 0);
227 BUG_ON(!list_empty(&hp->list));
228
229 kfree(hp->self_base);
230}
231
232static struct mdesc_mem_ops kmalloc_mdesc_memops = {
233 .alloc = mdesc_kmalloc,
234 .free = mdesc_kfree,
235};
236
237static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
238 struct mdesc_mem_ops *mops)
239{
240 struct mdesc_handle *hp = mops->alloc(mdesc_size);
241
242 if (hp)
243 hp->mops = mops;
244
245 return hp;
246}
247
248static void mdesc_free(struct mdesc_handle *hp)
249{
250 hp->mops->free(hp);
251}
252
253static struct mdesc_handle *cur_mdesc;
254static LIST_HEAD(mdesc_zombie_list);
255static DEFINE_SPINLOCK(mdesc_lock);
256
257struct mdesc_handle *mdesc_grab(void)
258{
259 struct mdesc_handle *hp;
260 unsigned long flags;
261
262 spin_lock_irqsave(&mdesc_lock, flags);
263 hp = cur_mdesc;
264 if (hp)
265 refcount_inc(&hp->refcnt);
266 spin_unlock_irqrestore(&mdesc_lock, flags);
267
268 return hp;
269}
270EXPORT_SYMBOL(mdesc_grab);
271
272void mdesc_release(struct mdesc_handle *hp)
273{
274 unsigned long flags;
275
276 spin_lock_irqsave(&mdesc_lock, flags);
277 if (refcount_dec_and_test(&hp->refcnt)) {
278 list_del_init(&hp->list);
279 hp->mops->free(hp);
280 }
281 spin_unlock_irqrestore(&mdesc_lock, flags);
282}
283EXPORT_SYMBOL(mdesc_release);
284
285static DEFINE_MUTEX(mdesc_mutex);
286static struct mdesc_notifier_client *client_list;
287
288void mdesc_register_notifier(struct mdesc_notifier_client *client)
289{
290 bool supported = false;
291 u64 node;
292 int i;
293
294 mutex_lock(&mdesc_mutex);
295
296 /* check to see if the node is supported for registration */
297 for (i = 0; md_node_ops_table[i].name != NULL; i++) {
298 if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) {
299 supported = true;
300 break;
301 }
302 }
303
304 if (!supported) {
305 pr_err("MD: %s node not supported\n", client->node_name);
306 mutex_unlock(&mdesc_mutex);
307 return;
308 }
309
310 client->next = client_list;
311 client_list = client;
312
313 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
314 client->add(cur_mdesc, node, client->node_name);
315
316 mutex_unlock(&mdesc_mutex);
317}
318
319static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
320{
321 const u64 *id;
322 u64 a;
323
324 id = NULL;
325 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
326 u64 target;
327
328 target = mdesc_arc_target(hp, a);
329 id = mdesc_get_property(hp, target,
330 "cfg-handle", NULL);
331 if (id)
332 break;
333 }
334
335 return id;
336}
337
338static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
339 union md_node_info *node_info)
340{
341 const u64 *parent_cfg_hdlp;
342 const char *name;
343 const u64 *idp;
344
345 /*
346 * Virtual device nodes are distinguished by:
347 * 1. "id" property
348 * 2. "name" property
349 * 3. parent node "cfg-handle" property
350 */
351 idp = mdesc_get_property(md, node, "id", NULL);
352 name = mdesc_get_property(md, node, "name", NULL);
353 parent_cfg_hdlp = parent_cfg_handle(md, node);
354
355 if (!idp || !name || !parent_cfg_hdlp)
356 return -1;
357
358 node_info->vdev_port.id = *idp;
359 node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL);
360 node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp;
361
362 return 0;
363}
364
365static void rel_vdev_port_node_info(union md_node_info *node_info)
366{
367 if (node_info && node_info->vdev_port.name) {
368 kfree_const(node_info->vdev_port.name);
369 node_info->vdev_port.name = NULL;
370 }
371}
372
373static bool vdev_port_node_match(union md_node_info *a_node_info,
374 union md_node_info *b_node_info)
375{
376 if (a_node_info->vdev_port.id != b_node_info->vdev_port.id)
377 return false;
378
379 if (a_node_info->vdev_port.parent_cfg_hdl !=
380 b_node_info->vdev_port.parent_cfg_hdl)
381 return false;
382
383 if (strncmp(a_node_info->vdev_port.name,
384 b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0)
385 return false;
386
387 return true;
388}
389
390static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
391 union md_node_info *node_info)
392{
393 const u64 *idp;
394
395 /* DS port nodes use the "id" property to distinguish them */
396 idp = mdesc_get_property(md, node, "id", NULL);
397 if (!idp)
398 return -1;
399
400 node_info->ds_port.id = *idp;
401
402 return 0;
403}
404
405static void rel_ds_port_node_info(union md_node_info *node_info)
406{
407}
408
409static bool ds_port_node_match(union md_node_info *a_node_info,
410 union md_node_info *b_node_info)
411{
412 if (a_node_info->ds_port.id != b_node_info->ds_port.id)
413 return false;
414
415 return true;
416}
417
418/* Run 'func' on nodes which are in A but not in B. */
419static void invoke_on_missing(const char *name,
420 struct mdesc_handle *a,
421 struct mdesc_handle *b,
422 void (*func)(struct mdesc_handle *, u64,
423 const char *node_name))
424{
425 mdesc_node_info_get_f get_info_func;
426 mdesc_node_info_rel_f rel_info_func;
427 mdesc_node_match_f node_match_func;
428 union md_node_info a_node_info;
429 union md_node_info b_node_info;
430 bool found;
431 u64 a_node;
432 u64 b_node;
433 int rv;
434
435 /*
436 * Find the get_info, rel_info and node_match ops for the given
437 * node name
438 */
439 mdesc_get_node_ops(name, &get_info_func, &rel_info_func,
440 &node_match_func);
441
442 /* If we didn't find a match, the node type is not supported */
443 if (!get_info_func || !rel_info_func || !node_match_func) {
444 pr_err("MD: %s node type is not supported\n", name);
445 return;
446 }
447
448 mdesc_for_each_node_by_name(a, a_node, name) {
449 found = false;
450
451 rv = get_info_func(a, a_node, &a_node_info);
452 if (rv != 0) {
453 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
454 name);
455 continue;
456 }
457
458 /* Check each node in B for node matching a_node */
459 mdesc_for_each_node_by_name(b, b_node, name) {
460 rv = get_info_func(b, b_node, &b_node_info);
461 if (rv != 0)
462 continue;
463
464 if (node_match_func(&a_node_info, &b_node_info)) {
465 found = true;
466 rel_info_func(&b_node_info);
467 break;
468 }
469
470 rel_info_func(&b_node_info);
471 }
472
473 rel_info_func(&a_node_info);
474
475 if (!found)
476 func(a, a_node, name);
477 }
478}
479
480static void notify_one(struct mdesc_notifier_client *p,
481 struct mdesc_handle *old_hp,
482 struct mdesc_handle *new_hp)
483{
484 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
485 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
486}
487
488static void mdesc_notify_clients(struct mdesc_handle *old_hp,
489 struct mdesc_handle *new_hp)
490{
491 struct mdesc_notifier_client *p = client_list;
492
493 while (p) {
494 notify_one(p, old_hp, new_hp);
495 p = p->next;
496 }
497}
498
499void mdesc_update(void)
500{
501 unsigned long len, real_len, status;
502 struct mdesc_handle *hp, *orig_hp;
503 unsigned long flags;
504
505 mutex_lock(&mdesc_mutex);
506
507 (void) sun4v_mach_desc(0UL, 0UL, &len);
508
509 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
510 if (!hp) {
511 printk(KERN_ERR "MD: mdesc alloc fails\n");
512 goto out;
513 }
514
515 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
516 if (status != HV_EOK || real_len > len) {
517 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
518 status);
519 refcount_dec(&hp->refcnt);
520 mdesc_free(hp);
521 goto out;
522 }
523
524 spin_lock_irqsave(&mdesc_lock, flags);
525 orig_hp = cur_mdesc;
526 cur_mdesc = hp;
527 spin_unlock_irqrestore(&mdesc_lock, flags);
528
529 mdesc_notify_clients(orig_hp, hp);
530
531 spin_lock_irqsave(&mdesc_lock, flags);
532 if (refcount_dec_and_test(&orig_hp->refcnt))
533 mdesc_free(orig_hp);
534 else
535 list_add(&orig_hp->list, &mdesc_zombie_list);
536 spin_unlock_irqrestore(&mdesc_lock, flags);
537
538out:
539 mutex_unlock(&mdesc_mutex);
540}
541
542u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
543 union md_node_info *node_info)
544{
545 mdesc_node_info_get_f get_info_func;
546 mdesc_node_info_rel_f rel_info_func;
547 mdesc_node_match_f node_match_func;
548 union md_node_info hp_node_info;
549 u64 hp_node;
550 int rv;
551
552 if (hp == NULL || node_name == NULL || node_info == NULL)
553 return MDESC_NODE_NULL;
554
555 /* Find the ops for the given node name */
556 mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func,
557 &node_match_func);
558
559 /* If we didn't find ops for the given node name, it is not supported */
560 if (!get_info_func || !rel_info_func || !node_match_func) {
561 pr_err("MD: %s node is not supported\n", node_name);
562 return -EINVAL;
563 }
564
565 mdesc_for_each_node_by_name(hp, hp_node, node_name) {
566 rv = get_info_func(hp, hp_node, &hp_node_info);
567 if (rv != 0)
568 continue;
569
570 if (node_match_func(node_info, &hp_node_info))
571 break;
572
573 rel_info_func(&hp_node_info);
574 }
575
576 rel_info_func(&hp_node_info);
577
578 return hp_node;
579}
580EXPORT_SYMBOL(mdesc_get_node);
581
582int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
583 const char *node_name, union md_node_info *node_info)
584{
585 mdesc_node_info_get_f get_info_func;
586 int rv;
587
588 if (hp == NULL || node == MDESC_NODE_NULL ||
589 node_name == NULL || node_info == NULL)
590 return -EINVAL;
591
592 /* Find the get_info op for the given node name */
593 mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL);
594
595 /* If we didn't find a get_info_func, the node name is not supported */
596 if (get_info_func == NULL) {
597 pr_err("MD: %s node is not supported\n", node_name);
598 return -EINVAL;
599 }
600
601 rv = get_info_func(hp, node, node_info);
602 if (rv != 0) {
603 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
604 node_name);
605 return -1;
606 }
607
608 return 0;
609}
610EXPORT_SYMBOL(mdesc_get_node_info);
611
612static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
613{
614 return (struct mdesc_elem *) (mdesc + 1);
615}
616
617static void *name_block(struct mdesc_hdr *mdesc)
618{
619 return ((void *) node_block(mdesc)) + mdesc->node_sz;
620}
621
622static void *data_block(struct mdesc_hdr *mdesc)
623{
624 return ((void *) name_block(mdesc)) + mdesc->name_sz;
625}
626
627u64 mdesc_node_by_name(struct mdesc_handle *hp,
628 u64 from_node, const char *name)
629{
630 struct mdesc_elem *ep = node_block(&hp->mdesc);
631 const char *names = name_block(&hp->mdesc);
632 u64 last_node = hp->mdesc.node_sz / 16;
633 u64 ret;
634
635 if (from_node == MDESC_NODE_NULL) {
636 ret = from_node = 0;
637 } else if (from_node >= last_node) {
638 return MDESC_NODE_NULL;
639 } else {
640 ret = ep[from_node].d.val;
641 }
642
643 while (ret < last_node) {
644 if (ep[ret].tag != MD_NODE)
645 return MDESC_NODE_NULL;
646 if (!strcmp(names + ep[ret].name_offset, name))
647 break;
648 ret = ep[ret].d.val;
649 }
650 if (ret >= last_node)
651 ret = MDESC_NODE_NULL;
652 return ret;
653}
654EXPORT_SYMBOL(mdesc_node_by_name);
655
656const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
657 const char *name, int *lenp)
658{
659 const char *names = name_block(&hp->mdesc);
660 u64 last_node = hp->mdesc.node_sz / 16;
661 void *data = data_block(&hp->mdesc);
662 struct mdesc_elem *ep;
663
664 if (node == MDESC_NODE_NULL || node >= last_node)
665 return NULL;
666
667 ep = node_block(&hp->mdesc) + node;
668 ep++;
669 for (; ep->tag != MD_NODE_END; ep++) {
670 void *val = NULL;
671 int len = 0;
672
673 switch (ep->tag) {
674 case MD_PROP_VAL:
675 val = &ep->d.val;
676 len = 8;
677 break;
678
679 case MD_PROP_STR:
680 case MD_PROP_DATA:
681 val = data + ep->d.data.data_offset;
682 len = ep->d.data.data_len;
683 break;
684
685 default:
686 break;
687 }
688 if (!val)
689 continue;
690
691 if (!strcmp(names + ep->name_offset, name)) {
692 if (lenp)
693 *lenp = len;
694 return val;
695 }
696 }
697
698 return NULL;
699}
700EXPORT_SYMBOL(mdesc_get_property);
701
702u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
703{
704 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
705 const char *names = name_block(&hp->mdesc);
706 u64 last_node = hp->mdesc.node_sz / 16;
707
708 if (from == MDESC_NODE_NULL || from >= last_node)
709 return MDESC_NODE_NULL;
710
711 ep = base + from;
712
713 ep++;
714 for (; ep->tag != MD_NODE_END; ep++) {
715 if (ep->tag != MD_PROP_ARC)
716 continue;
717
718 if (strcmp(names + ep->name_offset, arc_type))
719 continue;
720
721 return ep - base;
722 }
723
724 return MDESC_NODE_NULL;
725}
726EXPORT_SYMBOL(mdesc_next_arc);
727
728u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
729{
730 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
731
732 ep = base + arc;
733
734 return ep->d.val;
735}
736EXPORT_SYMBOL(mdesc_arc_target);
737
738const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
739{
740 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
741 const char *names = name_block(&hp->mdesc);
742 u64 last_node = hp->mdesc.node_sz / 16;
743
744 if (node == MDESC_NODE_NULL || node >= last_node)
745 return NULL;
746
747 ep = base + node;
748 if (ep->tag != MD_NODE)
749 return NULL;
750
751 return names + ep->name_offset;
752}
753EXPORT_SYMBOL(mdesc_node_name);
754
755static u64 max_cpus = 64;
756
757static void __init report_platform_properties(void)
758{
759 struct mdesc_handle *hp = mdesc_grab();
760 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
761 const char *s;
762 const u64 *v;
763
764 if (pn == MDESC_NODE_NULL) {
765 prom_printf("No platform node in machine-description.\n");
766 prom_halt();
767 }
768
769 s = mdesc_get_property(hp, pn, "banner-name", NULL);
770 printk("PLATFORM: banner-name [%s]\n", s);
771 s = mdesc_get_property(hp, pn, "name", NULL);
772 printk("PLATFORM: name [%s]\n", s);
773
774 v = mdesc_get_property(hp, pn, "hostid", NULL);
775 if (v)
776 printk("PLATFORM: hostid [%08llx]\n", *v);
777 v = mdesc_get_property(hp, pn, "serial#", NULL);
778 if (v)
779 printk("PLATFORM: serial# [%08llx]\n", *v);
780 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
781 printk("PLATFORM: stick-frequency [%08llx]\n", *v);
782 v = mdesc_get_property(hp, pn, "mac-address", NULL);
783 if (v)
784 printk("PLATFORM: mac-address [%llx]\n", *v);
785 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
786 if (v)
787 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
788 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
789 if (v)
790 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
791 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
792 if (v) {
793 max_cpus = *v;
794 printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
795 }
796
797#ifdef CONFIG_SMP
798 {
799 int max_cpu, i;
800
801 if (v) {
802 max_cpu = *v;
803 if (max_cpu > NR_CPUS)
804 max_cpu = NR_CPUS;
805 } else {
806 max_cpu = NR_CPUS;
807 }
808 for (i = 0; i < max_cpu; i++)
809 set_cpu_possible(i, true);
810 }
811#endif
812
813 mdesc_release(hp);
814}
815
816static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp)
817{
818 const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
819 const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
820 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
821 const char *type;
822 int type_len;
823
824 type = mdesc_get_property(hp, mp, "type", &type_len);
825
826 switch (*level) {
827 case 1:
828 if (of_find_in_proplist(type, "instn", type_len)) {
829 c->icache_size = *size;
830 c->icache_line_size = *line_size;
831 } else if (of_find_in_proplist(type, "data", type_len)) {
832 c->dcache_size = *size;
833 c->dcache_line_size = *line_size;
834 }
835 break;
836
837 case 2:
838 c->ecache_size = *size;
839 c->ecache_line_size = *line_size;
840 break;
841
842 default:
843 break;
844 }
845
846 if (*level == 1) {
847 u64 a;
848
849 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
850 u64 target = mdesc_arc_target(hp, a);
851 const char *name = mdesc_node_name(hp, target);
852
853 if (!strcmp(name, "cache"))
854 fill_in_one_cache(c, hp, target);
855 }
856 }
857}
858
859static void find_back_node_value(struct mdesc_handle *hp, u64 node,
860 char *srch_val,
861 void (*func)(struct mdesc_handle *, u64, int),
862 u64 val, int depth)
863{
864 u64 arc;
865
866 /* Since we have an estimate of recursion depth, do a sanity check. */
867 if (depth == 0)
868 return;
869
870 mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) {
871 u64 n = mdesc_arc_target(hp, arc);
872 const char *name = mdesc_node_name(hp, n);
873
874 if (!strcmp(srch_val, name))
875 (*func)(hp, n, val);
876
877 find_back_node_value(hp, n, srch_val, func, val, depth-1);
878 }
879}
880
881static void __mark_core_id(struct mdesc_handle *hp, u64 node,
882 int core_id)
883{
884 const u64 *id = mdesc_get_property(hp, node, "id", NULL);
885
886 if (*id < num_possible_cpus())
887 cpu_data(*id).core_id = core_id;
888}
889
890static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node,
891 int max_cache_id)
892{
893 const u64 *id = mdesc_get_property(hp, node, "id", NULL);
894
895 if (*id < num_possible_cpus()) {
896 cpu_data(*id).max_cache_id = max_cache_id;
897
898 /**
899 * On systems without explicit socket descriptions socket
900 * is max_cache_id
901 */
902 cpu_data(*id).sock_id = max_cache_id;
903 }
904}
905
906static void mark_core_ids(struct mdesc_handle *hp, u64 mp,
907 int core_id)
908{
909 find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10);
910}
911
912static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp,
913 int max_cache_id)
914{
915 find_back_node_value(hp, mp, "cpu", __mark_max_cache_id,
916 max_cache_id, 10);
917}
918
919static void set_core_ids(struct mdesc_handle *hp)
920{
921 int idx;
922 u64 mp;
923
924 idx = 1;
925
926 /* Identify unique cores by looking for cpus backpointed to by
927 * level 1 instruction caches.
928 */
929 mdesc_for_each_node_by_name(hp, mp, "cache") {
930 const u64 *level;
931 const char *type;
932 int len;
933
934 level = mdesc_get_property(hp, mp, "level", NULL);
935 if (*level != 1)
936 continue;
937
938 type = mdesc_get_property(hp, mp, "type", &len);
939 if (!of_find_in_proplist(type, "instn", len))
940 continue;
941
942 mark_core_ids(hp, mp, idx);
943 idx++;
944 }
945}
946
947static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level)
948{
949 u64 mp;
950 int idx = 1;
951 int fnd = 0;
952
953 /**
954 * Identify unique highest level of shared cache by looking for cpus
955 * backpointed to by shared level N caches.
956 */
957 mdesc_for_each_node_by_name(hp, mp, "cache") {
958 const u64 *cur_lvl;
959
960 cur_lvl = mdesc_get_property(hp, mp, "level", NULL);
961 if (*cur_lvl != level)
962 continue;
963 mark_max_cache_ids(hp, mp, idx);
964 idx++;
965 fnd = 1;
966 }
967 return fnd;
968}
969
970static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp)
971{
972 int idx = 1;
973
974 mdesc_for_each_node_by_name(hp, mp, "socket") {
975 u64 a;
976
977 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
978 u64 t = mdesc_arc_target(hp, a);
979 const char *name;
980 const u64 *id;
981
982 name = mdesc_node_name(hp, t);
983 if (strcmp(name, "cpu"))
984 continue;
985
986 id = mdesc_get_property(hp, t, "id", NULL);
987 if (*id < num_possible_cpus())
988 cpu_data(*id).sock_id = idx;
989 }
990 idx++;
991 }
992}
993
994static void set_sock_ids(struct mdesc_handle *hp)
995{
996 u64 mp;
997
998 /**
999 * Find the highest level of shared cache which pre-T7 is also
1000 * the socket.
1001 */
1002 if (!set_max_cache_ids_by_cache(hp, 3))
1003 set_max_cache_ids_by_cache(hp, 2);
1004
1005 /* If machine description exposes sockets data use it.*/
1006 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets");
1007 if (mp != MDESC_NODE_NULL)
1008 set_sock_ids_by_socket(hp, mp);
1009}
1010
1011static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
1012{
1013 u64 a;
1014
1015 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
1016 u64 t = mdesc_arc_target(hp, a);
1017 const char *name;
1018 const u64 *id;
1019
1020 name = mdesc_node_name(hp, t);
1021 if (strcmp(name, "cpu"))
1022 continue;
1023
1024 id = mdesc_get_property(hp, t, "id", NULL);
1025 if (*id < NR_CPUS)
1026 cpu_data(*id).proc_id = proc_id;
1027 }
1028}
1029
1030static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
1031{
1032 int idx;
1033 u64 mp;
1034
1035 idx = 0;
1036 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
1037 const char *type;
1038 int len;
1039
1040 type = mdesc_get_property(hp, mp, "type", &len);
1041 if (!of_find_in_proplist(type, "int", len) &&
1042 !of_find_in_proplist(type, "integer", len))
1043 continue;
1044
1045 mark_proc_ids(hp, mp, idx);
1046 idx++;
1047 }
1048}
1049
1050static void set_proc_ids(struct mdesc_handle *hp)
1051{
1052 __set_proc_ids(hp, "exec_unit");
1053 __set_proc_ids(hp, "exec-unit");
1054}
1055
1056static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
1057 unsigned long def, unsigned long max)
1058{
1059 u64 val;
1060
1061 if (!p)
1062 goto use_default;
1063 val = *p;
1064
1065 if (!val || val >= 64)
1066 goto use_default;
1067
1068 if (val > max)
1069 val = max;
1070
1071 *mask = ((1U << val) * 64U) - 1U;
1072 return;
1073
1074use_default:
1075 *mask = ((1U << def) * 64U) - 1U;
1076}
1077
1078static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
1079 struct trap_per_cpu *tb)
1080{
1081 static int printed;
1082 const u64 *val;
1083
1084 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
1085 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
1086
1087 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
1088 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
1089
1090 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
1091 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
1092
1093 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
1094 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
1095 if (!printed++) {
1096 pr_info("SUN4V: Mondo queue sizes "
1097 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
1098 tb->cpu_mondo_qmask + 1,
1099 tb->dev_mondo_qmask + 1,
1100 tb->resum_qmask + 1,
1101 tb->nonresum_qmask + 1);
1102 }
1103}
1104
1105static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
1106{
1107 struct mdesc_handle *hp = mdesc_grab();
1108 void *ret = NULL;
1109 u64 mp;
1110
1111 mdesc_for_each_node_by_name(hp, mp, "cpu") {
1112 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
1113 int cpuid = *id;
1114
1115#ifdef CONFIG_SMP
1116 if (cpuid >= NR_CPUS) {
1117 printk(KERN_WARNING "Ignoring CPU %d which is "
1118 ">= NR_CPUS (%d)\n",
1119 cpuid, NR_CPUS);
1120 continue;
1121 }
1122 if (!cpumask_test_cpu(cpuid, mask))
1123 continue;
1124#endif
1125
1126 ret = func(hp, mp, cpuid, arg);
1127 if (ret)
1128 goto out;
1129 }
1130out:
1131 mdesc_release(hp);
1132 return ret;
1133}
1134
1135static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
1136 void *arg)
1137{
1138 ncpus_probed++;
1139#ifdef CONFIG_SMP
1140 set_cpu_present(cpuid, true);
1141#endif
1142 return NULL;
1143}
1144
1145void mdesc_populate_present_mask(cpumask_t *mask)
1146{
1147 if (tlb_type != hypervisor)
1148 return;
1149
1150 ncpus_probed = 0;
1151 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
1152}
1153
1154static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
1155{
1156 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
1157 unsigned long *pgsz_mask = arg;
1158 u64 val;
1159
1160 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
1161 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
1162 if (pgsz_prop)
1163 val = *pgsz_prop;
1164
1165 if (!*pgsz_mask)
1166 *pgsz_mask = val;
1167 else
1168 *pgsz_mask &= val;
1169 return NULL;
1170}
1171
1172void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
1173{
1174 *pgsz_mask = 0;
1175 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
1176}
1177
1178static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
1179 void *arg)
1180{
1181 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
1182 struct trap_per_cpu *tb;
1183 cpuinfo_sparc *c;
1184 u64 a;
1185
1186#ifndef CONFIG_SMP
1187 /* On uniprocessor we only want the values for the
1188 * real physical cpu the kernel booted onto, however
1189 * cpu_data() only has one entry at index 0.
1190 */
1191 if (cpuid != real_hard_smp_processor_id())
1192 return NULL;
1193 cpuid = 0;
1194#endif
1195
1196 c = &cpu_data(cpuid);
1197 c->clock_tick = *cfreq;
1198
1199 tb = &trap_block[cpuid];
1200 get_mondo_data(hp, mp, tb);
1201
1202 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
1203 u64 j, t = mdesc_arc_target(hp, a);
1204 const char *t_name;
1205
1206 t_name = mdesc_node_name(hp, t);
1207 if (!strcmp(t_name, "cache")) {
1208 fill_in_one_cache(c, hp, t);
1209 continue;
1210 }
1211
1212 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
1213 u64 n = mdesc_arc_target(hp, j);
1214 const char *n_name;
1215
1216 n_name = mdesc_node_name(hp, n);
1217 if (!strcmp(n_name, "cache"))
1218 fill_in_one_cache(c, hp, n);
1219 }
1220 }
1221
1222 c->core_id = 0;
1223 c->proc_id = -1;
1224
1225 return NULL;
1226}
1227
1228void mdesc_fill_in_cpu_data(cpumask_t *mask)
1229{
1230 struct mdesc_handle *hp;
1231
1232 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
1233
1234 hp = mdesc_grab();
1235
1236 set_core_ids(hp);
1237 set_proc_ids(hp);
1238 set_sock_ids(hp);
1239
1240 mdesc_release(hp);
1241
1242 smp_fill_in_sib_core_maps();
1243}
1244
1245/* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is
1246 * opened. Hold this reference until /dev/mdesc is closed to ensure
1247 * mdesc data structure is not released underneath us. Store the
1248 * pointer to mdesc structure in private_data for read and seek to use
1249 */
1250static int mdesc_open(struct inode *inode, struct file *file)
1251{
1252 struct mdesc_handle *hp = mdesc_grab();
1253
1254 if (!hp)
1255 return -ENODEV;
1256
1257 file->private_data = hp;
1258
1259 return 0;
1260}
1261
1262static ssize_t mdesc_read(struct file *file, char __user *buf,
1263 size_t len, loff_t *offp)
1264{
1265 struct mdesc_handle *hp = file->private_data;
1266 unsigned char *mdesc;
1267 int bytes_left, count = len;
1268
1269 if (*offp >= hp->handle_size)
1270 return 0;
1271
1272 bytes_left = hp->handle_size - *offp;
1273 if (count > bytes_left)
1274 count = bytes_left;
1275
1276 mdesc = (unsigned char *)&hp->mdesc;
1277 mdesc += *offp;
1278 if (!copy_to_user(buf, mdesc, count)) {
1279 *offp += count;
1280 return count;
1281 } else {
1282 return -EFAULT;
1283 }
1284}
1285
1286static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
1287{
1288 struct mdesc_handle *hp = file->private_data;
1289
1290 return no_seek_end_llseek_size(file, offset, whence, hp->handle_size);
1291}
1292
1293/* mdesc_close() - /dev/mdesc is being closed, release the reference to
1294 * mdesc structure.
1295 */
1296static int mdesc_close(struct inode *inode, struct file *file)
1297{
1298 mdesc_release(file->private_data);
1299 return 0;
1300}
1301
1302static const struct file_operations mdesc_fops = {
1303 .open = mdesc_open,
1304 .read = mdesc_read,
1305 .llseek = mdesc_llseek,
1306 .release = mdesc_close,
1307 .owner = THIS_MODULE,
1308};
1309
1310static struct miscdevice mdesc_misc = {
1311 .minor = MISC_DYNAMIC_MINOR,
1312 .name = "mdesc",
1313 .fops = &mdesc_fops,
1314};
1315
1316static int __init mdesc_misc_init(void)
1317{
1318 return misc_register(&mdesc_misc);
1319}
1320
1321__initcall(mdesc_misc_init);
1322
1323void __init sun4v_mdesc_init(void)
1324{
1325 struct mdesc_handle *hp;
1326 unsigned long len, real_len, status;
1327
1328 (void) sun4v_mach_desc(0UL, 0UL, &len);
1329
1330 printk("MDESC: Size is %lu bytes.\n", len);
1331
1332 hp = mdesc_alloc(len, &memblock_mdesc_ops);
1333 if (hp == NULL) {
1334 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
1335 prom_halt();
1336 }
1337
1338 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
1339 if (status != HV_EOK || real_len > len) {
1340 prom_printf("sun4v_mach_desc fails, err(%lu), "
1341 "len(%lu), real_len(%lu)\n",
1342 status, len, real_len);
1343 mdesc_free(hp);
1344 prom_halt();
1345 }
1346
1347 cur_mdesc = hp;
1348
1349 mdesc_adi_init();
1350 report_platform_properties();
1351}
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
15#include <asm/cpudata.h>
16#include <asm/hypervisor.h>
17#include <asm/mdesc.h>
18#include <asm/prom.h>
19#include <asm/oplib.h>
20#include <asm/smp.h>
21
22/* Unlike the OBP device tree, the machine description is a full-on
23 * DAG. An arbitrary number of ARCs are possible from one
24 * node to other nodes and thus we can't use the OBP device_node
25 * data structure to represent these nodes inside of the kernel.
26 *
27 * Actually, it isn't even a DAG, because there are back pointers
28 * which create cycles in the graph.
29 *
30 * mdesc_hdr and mdesc_elem describe the layout of the data structure
31 * we get from the Hypervisor.
32 */
33struct mdesc_hdr {
34 u32 version; /* Transport version */
35 u32 node_sz; /* node block size */
36 u32 name_sz; /* name block size */
37 u32 data_sz; /* data block size */
38} __attribute__((aligned(16)));
39
40struct mdesc_elem {
41 u8 tag;
42#define MD_LIST_END 0x00
43#define MD_NODE 0x4e
44#define MD_NODE_END 0x45
45#define MD_NOOP 0x20
46#define MD_PROP_ARC 0x61
47#define MD_PROP_VAL 0x76
48#define MD_PROP_STR 0x73
49#define MD_PROP_DATA 0x64
50 u8 name_len;
51 u16 resv;
52 u32 name_offset;
53 union {
54 struct {
55 u32 data_len;
56 u32 data_offset;
57 } data;
58 u64 val;
59 } d;
60};
61
62struct mdesc_mem_ops {
63 struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
64 void (*free)(struct mdesc_handle *handle);
65};
66
67struct mdesc_handle {
68 struct list_head list;
69 struct mdesc_mem_ops *mops;
70 void *self_base;
71 atomic_t refcnt;
72 unsigned int handle_size;
73 struct mdesc_hdr mdesc;
74};
75
76static void mdesc_handle_init(struct mdesc_handle *hp,
77 unsigned int handle_size,
78 void *base)
79{
80 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
81
82 memset(hp, 0, handle_size);
83 INIT_LIST_HEAD(&hp->list);
84 hp->self_base = base;
85 atomic_set(&hp->refcnt, 1);
86 hp->handle_size = handle_size;
87}
88
89static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
90{
91 unsigned int handle_size, alloc_size;
92 struct mdesc_handle *hp;
93 unsigned long paddr;
94
95 handle_size = (sizeof(struct mdesc_handle) -
96 sizeof(struct mdesc_hdr) +
97 mdesc_size);
98 alloc_size = PAGE_ALIGN(handle_size);
99
100 paddr = memblock_alloc(alloc_size, PAGE_SIZE);
101
102 hp = NULL;
103 if (paddr) {
104 hp = __va(paddr);
105 mdesc_handle_init(hp, handle_size, hp);
106 }
107 return hp;
108}
109
110static void __init mdesc_memblock_free(struct mdesc_handle *hp)
111{
112 unsigned int alloc_size;
113 unsigned long start;
114
115 BUG_ON(atomic_read(&hp->refcnt) != 0);
116 BUG_ON(!list_empty(&hp->list));
117
118 alloc_size = PAGE_ALIGN(hp->handle_size);
119 start = __pa(hp);
120 free_bootmem_late(start, alloc_size);
121}
122
123static struct mdesc_mem_ops memblock_mdesc_ops = {
124 .alloc = mdesc_memblock_alloc,
125 .free = mdesc_memblock_free,
126};
127
128static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
129{
130 unsigned int handle_size;
131 void *base;
132
133 handle_size = (sizeof(struct mdesc_handle) -
134 sizeof(struct mdesc_hdr) +
135 mdesc_size);
136
137 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
138 if (base) {
139 struct mdesc_handle *hp;
140 unsigned long addr;
141
142 addr = (unsigned long)base;
143 addr = (addr + 15UL) & ~15UL;
144 hp = (struct mdesc_handle *) addr;
145
146 mdesc_handle_init(hp, handle_size, base);
147 return hp;
148 }
149
150 return NULL;
151}
152
153static void mdesc_kfree(struct mdesc_handle *hp)
154{
155 BUG_ON(atomic_read(&hp->refcnt) != 0);
156 BUG_ON(!list_empty(&hp->list));
157
158 kfree(hp->self_base);
159}
160
161static struct mdesc_mem_ops kmalloc_mdesc_memops = {
162 .alloc = mdesc_kmalloc,
163 .free = mdesc_kfree,
164};
165
166static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
167 struct mdesc_mem_ops *mops)
168{
169 struct mdesc_handle *hp = mops->alloc(mdesc_size);
170
171 if (hp)
172 hp->mops = mops;
173
174 return hp;
175}
176
177static void mdesc_free(struct mdesc_handle *hp)
178{
179 hp->mops->free(hp);
180}
181
182static struct mdesc_handle *cur_mdesc;
183static LIST_HEAD(mdesc_zombie_list);
184static DEFINE_SPINLOCK(mdesc_lock);
185
186struct mdesc_handle *mdesc_grab(void)
187{
188 struct mdesc_handle *hp;
189 unsigned long flags;
190
191 spin_lock_irqsave(&mdesc_lock, flags);
192 hp = cur_mdesc;
193 if (hp)
194 atomic_inc(&hp->refcnt);
195 spin_unlock_irqrestore(&mdesc_lock, flags);
196
197 return hp;
198}
199EXPORT_SYMBOL(mdesc_grab);
200
201void mdesc_release(struct mdesc_handle *hp)
202{
203 unsigned long flags;
204
205 spin_lock_irqsave(&mdesc_lock, flags);
206 if (atomic_dec_and_test(&hp->refcnt)) {
207 list_del_init(&hp->list);
208 hp->mops->free(hp);
209 }
210 spin_unlock_irqrestore(&mdesc_lock, flags);
211}
212EXPORT_SYMBOL(mdesc_release);
213
214static DEFINE_MUTEX(mdesc_mutex);
215static struct mdesc_notifier_client *client_list;
216
217void mdesc_register_notifier(struct mdesc_notifier_client *client)
218{
219 u64 node;
220
221 mutex_lock(&mdesc_mutex);
222 client->next = client_list;
223 client_list = client;
224
225 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
226 client->add(cur_mdesc, node);
227
228 mutex_unlock(&mdesc_mutex);
229}
230
231static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
232{
233 const u64 *id;
234 u64 a;
235
236 id = NULL;
237 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
238 u64 target;
239
240 target = mdesc_arc_target(hp, a);
241 id = mdesc_get_property(hp, target,
242 "cfg-handle", NULL);
243 if (id)
244 break;
245 }
246
247 return id;
248}
249
250/* Run 'func' on nodes which are in A but not in B. */
251static void invoke_on_missing(const char *name,
252 struct mdesc_handle *a,
253 struct mdesc_handle *b,
254 void (*func)(struct mdesc_handle *, u64))
255{
256 u64 node;
257
258 mdesc_for_each_node_by_name(a, node, name) {
259 int found = 0, is_vdc_port = 0;
260 const char *name_prop;
261 const u64 *id;
262 u64 fnode;
263
264 name_prop = mdesc_get_property(a, node, "name", NULL);
265 if (name_prop && !strcmp(name_prop, "vdc-port")) {
266 is_vdc_port = 1;
267 id = parent_cfg_handle(a, node);
268 } else
269 id = mdesc_get_property(a, node, "id", NULL);
270
271 if (!id) {
272 printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
273 (name_prop ? name_prop : name));
274 continue;
275 }
276
277 mdesc_for_each_node_by_name(b, fnode, name) {
278 const u64 *fid;
279
280 if (is_vdc_port) {
281 name_prop = mdesc_get_property(b, fnode,
282 "name", NULL);
283 if (!name_prop ||
284 strcmp(name_prop, "vdc-port"))
285 continue;
286 fid = parent_cfg_handle(b, fnode);
287 if (!fid) {
288 printk(KERN_ERR "MD: Cannot find ID "
289 "for vdc-port node.\n");
290 continue;
291 }
292 } else
293 fid = mdesc_get_property(b, fnode,
294 "id", NULL);
295
296 if (*id == *fid) {
297 found = 1;
298 break;
299 }
300 }
301 if (!found)
302 func(a, node);
303 }
304}
305
306static void notify_one(struct mdesc_notifier_client *p,
307 struct mdesc_handle *old_hp,
308 struct mdesc_handle *new_hp)
309{
310 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
311 invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
312}
313
314static void mdesc_notify_clients(struct mdesc_handle *old_hp,
315 struct mdesc_handle *new_hp)
316{
317 struct mdesc_notifier_client *p = client_list;
318
319 while (p) {
320 notify_one(p, old_hp, new_hp);
321 p = p->next;
322 }
323}
324
325void mdesc_update(void)
326{
327 unsigned long len, real_len, status;
328 struct mdesc_handle *hp, *orig_hp;
329 unsigned long flags;
330
331 mutex_lock(&mdesc_mutex);
332
333 (void) sun4v_mach_desc(0UL, 0UL, &len);
334
335 hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
336 if (!hp) {
337 printk(KERN_ERR "MD: mdesc alloc fails\n");
338 goto out;
339 }
340
341 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
342 if (status != HV_EOK || real_len > len) {
343 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
344 status);
345 atomic_dec(&hp->refcnt);
346 mdesc_free(hp);
347 goto out;
348 }
349
350 spin_lock_irqsave(&mdesc_lock, flags);
351 orig_hp = cur_mdesc;
352 cur_mdesc = hp;
353 spin_unlock_irqrestore(&mdesc_lock, flags);
354
355 mdesc_notify_clients(orig_hp, hp);
356
357 spin_lock_irqsave(&mdesc_lock, flags);
358 if (atomic_dec_and_test(&orig_hp->refcnt))
359 mdesc_free(orig_hp);
360 else
361 list_add(&orig_hp->list, &mdesc_zombie_list);
362 spin_unlock_irqrestore(&mdesc_lock, flags);
363
364out:
365 mutex_unlock(&mdesc_mutex);
366}
367
368static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
369{
370 return (struct mdesc_elem *) (mdesc + 1);
371}
372
373static void *name_block(struct mdesc_hdr *mdesc)
374{
375 return ((void *) node_block(mdesc)) + mdesc->node_sz;
376}
377
378static void *data_block(struct mdesc_hdr *mdesc)
379{
380 return ((void *) name_block(mdesc)) + mdesc->name_sz;
381}
382
383u64 mdesc_node_by_name(struct mdesc_handle *hp,
384 u64 from_node, const char *name)
385{
386 struct mdesc_elem *ep = node_block(&hp->mdesc);
387 const char *names = name_block(&hp->mdesc);
388 u64 last_node = hp->mdesc.node_sz / 16;
389 u64 ret;
390
391 if (from_node == MDESC_NODE_NULL) {
392 ret = from_node = 0;
393 } else if (from_node >= last_node) {
394 return MDESC_NODE_NULL;
395 } else {
396 ret = ep[from_node].d.val;
397 }
398
399 while (ret < last_node) {
400 if (ep[ret].tag != MD_NODE)
401 return MDESC_NODE_NULL;
402 if (!strcmp(names + ep[ret].name_offset, name))
403 break;
404 ret = ep[ret].d.val;
405 }
406 if (ret >= last_node)
407 ret = MDESC_NODE_NULL;
408 return ret;
409}
410EXPORT_SYMBOL(mdesc_node_by_name);
411
412const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
413 const char *name, int *lenp)
414{
415 const char *names = name_block(&hp->mdesc);
416 u64 last_node = hp->mdesc.node_sz / 16;
417 void *data = data_block(&hp->mdesc);
418 struct mdesc_elem *ep;
419
420 if (node == MDESC_NODE_NULL || node >= last_node)
421 return NULL;
422
423 ep = node_block(&hp->mdesc) + node;
424 ep++;
425 for (; ep->tag != MD_NODE_END; ep++) {
426 void *val = NULL;
427 int len = 0;
428
429 switch (ep->tag) {
430 case MD_PROP_VAL:
431 val = &ep->d.val;
432 len = 8;
433 break;
434
435 case MD_PROP_STR:
436 case MD_PROP_DATA:
437 val = data + ep->d.data.data_offset;
438 len = ep->d.data.data_len;
439 break;
440
441 default:
442 break;
443 }
444 if (!val)
445 continue;
446
447 if (!strcmp(names + ep->name_offset, name)) {
448 if (lenp)
449 *lenp = len;
450 return val;
451 }
452 }
453
454 return NULL;
455}
456EXPORT_SYMBOL(mdesc_get_property);
457
458u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
459{
460 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
461 const char *names = name_block(&hp->mdesc);
462 u64 last_node = hp->mdesc.node_sz / 16;
463
464 if (from == MDESC_NODE_NULL || from >= last_node)
465 return MDESC_NODE_NULL;
466
467 ep = base + from;
468
469 ep++;
470 for (; ep->tag != MD_NODE_END; ep++) {
471 if (ep->tag != MD_PROP_ARC)
472 continue;
473
474 if (strcmp(names + ep->name_offset, arc_type))
475 continue;
476
477 return ep - base;
478 }
479
480 return MDESC_NODE_NULL;
481}
482EXPORT_SYMBOL(mdesc_next_arc);
483
484u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
485{
486 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
487
488 ep = base + arc;
489
490 return ep->d.val;
491}
492EXPORT_SYMBOL(mdesc_arc_target);
493
494const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
495{
496 struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
497 const char *names = name_block(&hp->mdesc);
498 u64 last_node = hp->mdesc.node_sz / 16;
499
500 if (node == MDESC_NODE_NULL || node >= last_node)
501 return NULL;
502
503 ep = base + node;
504 if (ep->tag != MD_NODE)
505 return NULL;
506
507 return names + ep->name_offset;
508}
509EXPORT_SYMBOL(mdesc_node_name);
510
511static u64 max_cpus = 64;
512
513static void __init report_platform_properties(void)
514{
515 struct mdesc_handle *hp = mdesc_grab();
516 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
517 const char *s;
518 const u64 *v;
519
520 if (pn == MDESC_NODE_NULL) {
521 prom_printf("No platform node in machine-description.\n");
522 prom_halt();
523 }
524
525 s = mdesc_get_property(hp, pn, "banner-name", NULL);
526 printk("PLATFORM: banner-name [%s]\n", s);
527 s = mdesc_get_property(hp, pn, "name", NULL);
528 printk("PLATFORM: name [%s]\n", s);
529
530 v = mdesc_get_property(hp, pn, "hostid", NULL);
531 if (v)
532 printk("PLATFORM: hostid [%08llx]\n", *v);
533 v = mdesc_get_property(hp, pn, "serial#", NULL);
534 if (v)
535 printk("PLATFORM: serial# [%08llx]\n", *v);
536 v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
537 printk("PLATFORM: stick-frequency [%08llx]\n", *v);
538 v = mdesc_get_property(hp, pn, "mac-address", NULL);
539 if (v)
540 printk("PLATFORM: mac-address [%llx]\n", *v);
541 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
542 if (v)
543 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
544 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
545 if (v)
546 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
547 v = mdesc_get_property(hp, pn, "max-cpus", NULL);
548 if (v) {
549 max_cpus = *v;
550 printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
551 }
552
553#ifdef CONFIG_SMP
554 {
555 int max_cpu, i;
556
557 if (v) {
558 max_cpu = *v;
559 if (max_cpu > NR_CPUS)
560 max_cpu = NR_CPUS;
561 } else {
562 max_cpu = NR_CPUS;
563 }
564 for (i = 0; i < max_cpu; i++)
565 set_cpu_possible(i, true);
566 }
567#endif
568
569 mdesc_release(hp);
570}
571
572static void __cpuinit fill_in_one_cache(cpuinfo_sparc *c,
573 struct mdesc_handle *hp,
574 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 __cpuinit mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
618{
619 u64 a;
620
621 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
622 u64 t = mdesc_arc_target(hp, a);
623 const char *name;
624 const u64 *id;
625
626 name = mdesc_node_name(hp, t);
627 if (!strcmp(name, "cpu")) {
628 id = mdesc_get_property(hp, t, "id", NULL);
629 if (*id < NR_CPUS)
630 cpu_data(*id).core_id = core_id;
631 } else {
632 u64 j;
633
634 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
635 u64 n = mdesc_arc_target(hp, j);
636 const char *n_name;
637
638 n_name = mdesc_node_name(hp, n);
639 if (strcmp(n_name, "cpu"))
640 continue;
641
642 id = mdesc_get_property(hp, n, "id", NULL);
643 if (*id < NR_CPUS)
644 cpu_data(*id).core_id = core_id;
645 }
646 }
647 }
648}
649
650static void __cpuinit set_core_ids(struct mdesc_handle *hp)
651{
652 int idx;
653 u64 mp;
654
655 idx = 1;
656 mdesc_for_each_node_by_name(hp, mp, "cache") {
657 const u64 *level;
658 const char *type;
659 int len;
660
661 level = mdesc_get_property(hp, mp, "level", NULL);
662 if (*level != 1)
663 continue;
664
665 type = mdesc_get_property(hp, mp, "type", &len);
666 if (!of_find_in_proplist(type, "instn", len))
667 continue;
668
669 mark_core_ids(hp, mp, idx);
670
671 idx++;
672 }
673}
674
675static void __cpuinit mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
676{
677 u64 a;
678
679 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
680 u64 t = mdesc_arc_target(hp, a);
681 const char *name;
682 const u64 *id;
683
684 name = mdesc_node_name(hp, t);
685 if (strcmp(name, "cpu"))
686 continue;
687
688 id = mdesc_get_property(hp, t, "id", NULL);
689 if (*id < NR_CPUS)
690 cpu_data(*id).proc_id = proc_id;
691 }
692}
693
694static void __cpuinit __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
695{
696 int idx;
697 u64 mp;
698
699 idx = 0;
700 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
701 const char *type;
702 int len;
703
704 type = mdesc_get_property(hp, mp, "type", &len);
705 if (!of_find_in_proplist(type, "int", len) &&
706 !of_find_in_proplist(type, "integer", len))
707 continue;
708
709 mark_proc_ids(hp, mp, idx);
710
711 idx++;
712 }
713}
714
715static void __cpuinit set_proc_ids(struct mdesc_handle *hp)
716{
717 __set_proc_ids(hp, "exec_unit");
718 __set_proc_ids(hp, "exec-unit");
719}
720
721static void __cpuinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
722 unsigned long def, unsigned long max)
723{
724 u64 val;
725
726 if (!p)
727 goto use_default;
728 val = *p;
729
730 if (!val || val >= 64)
731 goto use_default;
732
733 if (val > max)
734 val = max;
735
736 *mask = ((1U << val) * 64U) - 1U;
737 return;
738
739use_default:
740 *mask = ((1U << def) * 64U) - 1U;
741}
742
743static void __cpuinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
744 struct trap_per_cpu *tb)
745{
746 static int printed;
747 const u64 *val;
748
749 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
750 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
751
752 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
753 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
754
755 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
756 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
757
758 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
759 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
760 if (!printed++) {
761 pr_info("SUN4V: Mondo queue sizes "
762 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
763 tb->cpu_mondo_qmask + 1,
764 tb->dev_mondo_qmask + 1,
765 tb->resum_qmask + 1,
766 tb->nonresum_qmask + 1);
767 }
768}
769
770static void * __cpuinit mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
771{
772 struct mdesc_handle *hp = mdesc_grab();
773 void *ret = NULL;
774 u64 mp;
775
776 mdesc_for_each_node_by_name(hp, mp, "cpu") {
777 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
778 int cpuid = *id;
779
780#ifdef CONFIG_SMP
781 if (cpuid >= NR_CPUS) {
782 printk(KERN_WARNING "Ignoring CPU %d which is "
783 ">= NR_CPUS (%d)\n",
784 cpuid, NR_CPUS);
785 continue;
786 }
787 if (!cpumask_test_cpu(cpuid, mask))
788 continue;
789#endif
790
791 ret = func(hp, mp, cpuid, arg);
792 if (ret)
793 goto out;
794 }
795out:
796 mdesc_release(hp);
797 return ret;
798}
799
800static void * __cpuinit record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
801{
802 ncpus_probed++;
803#ifdef CONFIG_SMP
804 set_cpu_present(cpuid, true);
805#endif
806 return NULL;
807}
808
809void __cpuinit mdesc_populate_present_mask(cpumask_t *mask)
810{
811 if (tlb_type != hypervisor)
812 return;
813
814 ncpus_probed = 0;
815 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
816}
817
818static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
819{
820 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
821 struct trap_per_cpu *tb;
822 cpuinfo_sparc *c;
823 u64 a;
824
825#ifndef CONFIG_SMP
826 /* On uniprocessor we only want the values for the
827 * real physical cpu the kernel booted onto, however
828 * cpu_data() only has one entry at index 0.
829 */
830 if (cpuid != real_hard_smp_processor_id())
831 return NULL;
832 cpuid = 0;
833#endif
834
835 c = &cpu_data(cpuid);
836 c->clock_tick = *cfreq;
837
838 tb = &trap_block[cpuid];
839 get_mondo_data(hp, mp, tb);
840
841 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
842 u64 j, t = mdesc_arc_target(hp, a);
843 const char *t_name;
844
845 t_name = mdesc_node_name(hp, t);
846 if (!strcmp(t_name, "cache")) {
847 fill_in_one_cache(c, hp, t);
848 continue;
849 }
850
851 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
852 u64 n = mdesc_arc_target(hp, j);
853 const char *n_name;
854
855 n_name = mdesc_node_name(hp, n);
856 if (!strcmp(n_name, "cache"))
857 fill_in_one_cache(c, hp, n);
858 }
859 }
860
861 c->core_id = 0;
862 c->proc_id = -1;
863
864 return NULL;
865}
866
867void __cpuinit mdesc_fill_in_cpu_data(cpumask_t *mask)
868{
869 struct mdesc_handle *hp;
870
871 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
872
873#ifdef CONFIG_SMP
874 sparc64_multi_core = 1;
875#endif
876
877 hp = mdesc_grab();
878
879 set_core_ids(hp);
880 set_proc_ids(hp);
881
882 mdesc_release(hp);
883
884 smp_fill_in_sib_core_maps();
885}
886
887static ssize_t mdesc_read(struct file *file, char __user *buf,
888 size_t len, loff_t *offp)
889{
890 struct mdesc_handle *hp = mdesc_grab();
891 int err;
892
893 if (!hp)
894 return -ENODEV;
895
896 err = hp->handle_size;
897 if (len < hp->handle_size)
898 err = -EMSGSIZE;
899 else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
900 err = -EFAULT;
901 mdesc_release(hp);
902
903 return err;
904}
905
906static const struct file_operations mdesc_fops = {
907 .read = mdesc_read,
908 .owner = THIS_MODULE,
909 .llseek = noop_llseek,
910};
911
912static struct miscdevice mdesc_misc = {
913 .minor = MISC_DYNAMIC_MINOR,
914 .name = "mdesc",
915 .fops = &mdesc_fops,
916};
917
918static int __init mdesc_misc_init(void)
919{
920 return misc_register(&mdesc_misc);
921}
922
923__initcall(mdesc_misc_init);
924
925void __init sun4v_mdesc_init(void)
926{
927 struct mdesc_handle *hp;
928 unsigned long len, real_len, status;
929
930 (void) sun4v_mach_desc(0UL, 0UL, &len);
931
932 printk("MDESC: Size is %lu bytes.\n", len);
933
934 hp = mdesc_alloc(len, &memblock_mdesc_ops);
935 if (hp == NULL) {
936 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
937 prom_halt();
938 }
939
940 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
941 if (status != HV_EOK || real_len > len) {
942 prom_printf("sun4v_mach_desc fails, err(%lu), "
943 "len(%lu), real_len(%lu)\n",
944 status, len, real_len);
945 mdesc_free(hp);
946 prom_halt();
947 }
948
949 cur_mdesc = hp;
950
951 report_platform_properties();
952}