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TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/mdesc.c

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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  */
 38 struct 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 
 45 struct 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 
 67 struct mdesc_mem_ops {
 68         struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
 69         void (*free)(struct mdesc_handle *handle);
 70 };
 71 
 72 struct 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 
 81 typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,
 82                                      union md_node_info *);
 83 typedef void (*mdesc_node_info_rel_f)(union md_node_info *);
 84 typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);
 85 
 86 struct 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 
 93 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
 94                                    union md_node_info *node_info);
 95 static void rel_vdev_port_node_info(union md_node_info *node_info);
 96 static bool vdev_port_node_match(union md_node_info *a_node_info,
 97                                  union md_node_info *b_node_info);
 98 
 99 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
100                                  union md_node_info *node_info);
101 static void rel_ds_port_node_info(union md_node_info *node_info);
102 static 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 */
106 static 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 
114 static 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 
149 static 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 
162 static 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 
183 static 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 
196 static struct mdesc_mem_ops memblock_mdesc_ops = {
197         .alloc = mdesc_memblock_alloc,
198         .free  = mdesc_memblock_free,
199 };
200 
201 static 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 
224 static 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 
232 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
233         .alloc = mdesc_kmalloc,
234         .free  = mdesc_kfree,
235 };
236 
237 static 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 
248 static void mdesc_free(struct mdesc_handle *hp)
249 {
250         hp->mops->free(hp);
251 }
252 
253 static struct mdesc_handle *cur_mdesc;
254 static LIST_HEAD(mdesc_zombie_list);
255 static DEFINE_SPINLOCK(mdesc_lock);
256 
257 struct 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 }
270 EXPORT_SYMBOL(mdesc_grab);
271 
272 void 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 }
283 EXPORT_SYMBOL(mdesc_release);
284 
285 static DEFINE_MUTEX(mdesc_mutex);
286 static struct mdesc_notifier_client *client_list;
287 
288 void 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 
319 static 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 
338 static 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 
365 static 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 
373 static 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 
390 static 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 
405 static void rel_ds_port_node_info(union md_node_info *node_info)
406 {
407 }
408 
409 static 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.  */
419 static 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 
480 static 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 
488 static 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 
499 void 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 
538 out:
539         mutex_unlock(&mdesc_mutex);
540 }
541 
542 u64 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 }
580 EXPORT_SYMBOL(mdesc_get_node);
581 
582 int 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 }
610 EXPORT_SYMBOL(mdesc_get_node_info);
611 
612 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
613 {
614         return (struct mdesc_elem *) (mdesc + 1);
615 }
616 
617 static void *name_block(struct mdesc_hdr *mdesc)
618 {
619         return ((void *) node_block(mdesc)) + mdesc->node_sz;
620 }
621 
622 static void *data_block(struct mdesc_hdr *mdesc)
623 {
624         return ((void *) name_block(mdesc)) + mdesc->name_sz;
625 }
626 
627 u64 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 }
654 EXPORT_SYMBOL(mdesc_node_by_name);
655 
656 const 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 }
700 EXPORT_SYMBOL(mdesc_get_property);
701 
702 u64 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 }
726 EXPORT_SYMBOL(mdesc_next_arc);
727 
728 u64 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 }
736 EXPORT_SYMBOL(mdesc_arc_target);
737 
738 const 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 }
753 EXPORT_SYMBOL(mdesc_node_name);
754 
755 static u64 max_cpus = 64;
756 
757 static 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 
816 static 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 
859 static 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 
881 static 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 
890 static 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 
906 static 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 
912 static 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 
919 static 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 
947 static 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 
970 static 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 
994 static 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 
1011 static 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 
1030 static 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 
1050 static 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 
1056 static 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 
1074 use_default:
1075         *mask = ((1U << def) * 64U) - 1U;
1076 }
1077 
1078 static 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 
1105 static 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         }
1130 out:
1131         mdesc_release(hp);
1132         return ret;
1133 }
1134 
1135 static 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 
1145 void 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 
1154 static 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 
1172 void __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 
1178 static 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 
1228 void 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  */
1250 static 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 
1262 static 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 
1286 static 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  */
1296 static int mdesc_close(struct inode *inode, struct file *file)
1297 {
1298         mdesc_release(file->private_data);
1299         return 0;
1300 }
1301 
1302 static 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 
1310 static struct miscdevice mdesc_misc = {
1311         .minor  = MISC_DYNAMIC_MINOR,
1312         .name   = "mdesc",
1313         .fops   = &mdesc_fops,
1314 };
1315 
1316 static int __init mdesc_misc_init(void)
1317 {
1318         return misc_register(&mdesc_misc);
1319 }
1320 
1321 __initcall(mdesc_misc_init);
1322 
1323 void __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 }
1352 

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