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

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