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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/log2.h>
  9 #include <linux/list.h>
 10 #include <linux/slab.h>
 11 #include <linux/mm.h>
 12 #include <linux/miscdevice.h>
 13 #include <linux/memblock.h>
 14 #include <linux/export.h>
 15 #include <linux/refcount.h>
 16 
 17 #include <asm/cpudata.h>
 18 #include <asm/hypervisor.h>
 19 #include <asm/mdesc.h>
 20 #include <asm/prom.h>
 21 #include <linux/uaccess.h>
 22 #include <asm/oplib.h>
 23 #include <asm/smp.h>
 24 #include <asm/adi.h>
 25 
 26 /* Unlike the OBP device tree, the machine description is a full-on
 27  * DAG.  An arbitrary number of ARCs are possible from one
 28  * node to other nodes and thus we can't use the OBP device_node
 29  * data structure to represent these nodes inside of the kernel.
 30  *
 31  * Actually, it isn't even a DAG, because there are back pointers
 32  * which create cycles in the graph.
 33  *
 34  * mdesc_hdr and mdesc_elem describe the layout of the data structure
 35  * we get from the Hypervisor.
 36  */
 37 struct mdesc_hdr {
 38         u32     version; /* Transport version */
 39         u32     node_sz; /* node block size */
 40         u32     name_sz; /* name block size */
 41         u32     data_sz; /* data block size */
 42 } __attribute__((aligned(16)));
 43 
 44 struct mdesc_elem {
 45         u8      tag;
 46 #define MD_LIST_END     0x00
 47 #define MD_NODE         0x4e
 48 #define MD_NODE_END     0x45
 49 #define MD_NOOP         0x20
 50 #define MD_PROP_ARC     0x61
 51 #define MD_PROP_VAL     0x76
 52 #define MD_PROP_STR     0x73
 53 #define MD_PROP_DATA    0x64
 54         u8      name_len;
 55         u16     resv;
 56         u32     name_offset;
 57         union {
 58                 struct {
 59                         u32     data_len;
 60                         u32     data_offset;
 61                 } data;
 62                 u64     val;
 63         } d;
 64 };
 65 
 66 struct mdesc_mem_ops {
 67         struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
 68         void (*free)(struct mdesc_handle *handle);
 69 };
 70 
 71 struct mdesc_handle {
 72         struct list_head        list;
 73         struct mdesc_mem_ops    *mops;
 74         void                    *self_base;
 75         refcount_t              refcnt;
 76         unsigned int            handle_size;
 77         struct mdesc_hdr        mdesc;
 78 };
 79 
 80 typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64,
 81                                      union md_node_info *);
 82 typedef void (*mdesc_node_info_rel_f)(union md_node_info *);
 83 typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *);
 84 
 85 struct md_node_ops {
 86         char                    *name;
 87         mdesc_node_info_get_f   get_info;
 88         mdesc_node_info_rel_f   rel_info;
 89         mdesc_node_match_f      node_match;
 90 };
 91 
 92 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
 93                                    union md_node_info *node_info);
 94 static void rel_vdev_port_node_info(union md_node_info *node_info);
 95 static bool vdev_port_node_match(union md_node_info *a_node_info,
 96                                  union md_node_info *b_node_info);
 97 
 98 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
 99                                  union md_node_info *node_info);
100 static void rel_ds_port_node_info(union md_node_info *node_info);
101 static bool ds_port_node_match(union md_node_info *a_node_info,
102                                union md_node_info *b_node_info);
103 
104 /* supported node types which can be registered */
105 static struct md_node_ops md_node_ops_table[] = {
106         {"virtual-device-port", get_vdev_port_node_info,
107          rel_vdev_port_node_info, vdev_port_node_match},
108         {"domain-services-port", get_ds_port_node_info,
109          rel_ds_port_node_info, ds_port_node_match},
110         {NULL, NULL, NULL, NULL}
111 };
112 
113 static void mdesc_get_node_ops(const char *node_name,
114                                mdesc_node_info_get_f *get_info_f,
115                                mdesc_node_info_rel_f *rel_info_f,
116                                mdesc_node_match_f *match_f)
117 {
118         int i;
119 
120         if (get_info_f)
121                 *get_info_f = NULL;
122 
123         if (rel_info_f)
124                 *rel_info_f = NULL;
125 
126         if (match_f)
127                 *match_f = NULL;
128 
129         if (!node_name)
130                 return;
131 
132         for (i = 0; md_node_ops_table[i].name != NULL; i++) {
133                 if (strcmp(md_node_ops_table[i].name, node_name) == 0) {
134                         if (get_info_f)
135                                 *get_info_f = md_node_ops_table[i].get_info;
136 
137                         if (rel_info_f)
138                                 *rel_info_f = md_node_ops_table[i].rel_info;
139 
140                         if (match_f)
141                                 *match_f = md_node_ops_table[i].node_match;
142 
143                         break;
144                 }
145         }
146 }
147 
148 static void mdesc_handle_init(struct mdesc_handle *hp,
149                               unsigned int handle_size,
150                               void *base)
151 {
152         BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
153 
154         memset(hp, 0, handle_size);
155         INIT_LIST_HEAD(&hp->list);
156         hp->self_base = base;
157         refcount_set(&hp->refcnt, 1);
158         hp->handle_size = handle_size;
159 }
160 
161 static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
162 {
163         unsigned int handle_size, alloc_size;
164         struct mdesc_handle *hp;
165         unsigned long paddr;
166 
167         handle_size = (sizeof(struct mdesc_handle) -
168                        sizeof(struct mdesc_hdr) +
169                        mdesc_size);
170         alloc_size = PAGE_ALIGN(handle_size);
171 
172         paddr = memblock_phys_alloc(alloc_size, PAGE_SIZE);
173 
174         hp = NULL;
175         if (paddr) {
176                 hp = __va(paddr);
177                 mdesc_handle_init(hp, handle_size, hp);
178         }
179         return hp;
180 }
181 
182 static void __init mdesc_memblock_free(struct mdesc_handle *hp)
183 {
184         unsigned int alloc_size;
185         unsigned long start;
186 
187         BUG_ON(refcount_read(&hp->refcnt) != 0);
188         BUG_ON(!list_empty(&hp->list));
189 
190         alloc_size = PAGE_ALIGN(hp->handle_size);
191         start = __pa(hp);
192         memblock_free_late(start, alloc_size);
193 }
194 
195 static struct mdesc_mem_ops memblock_mdesc_ops = {
196         .alloc = mdesc_memblock_alloc,
197         .free  = mdesc_memblock_free,
198 };
199 
200 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
201 {
202         unsigned int handle_size;
203         struct mdesc_handle *hp;
204         unsigned long addr;
205         void *base;
206 
207         handle_size = (sizeof(struct mdesc_handle) -
208                        sizeof(struct mdesc_hdr) +
209                        mdesc_size);
210         base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
211         if (!base)
212                 return NULL;
213 
214         addr = (unsigned long)base;
215         addr = (addr + 15UL) & ~15UL;
216         hp = (struct mdesc_handle *) addr;
217 
218         mdesc_handle_init(hp, handle_size, base);
219 
220         return hp;
221 }
222 
223 static void mdesc_kfree(struct mdesc_handle *hp)
224 {
225         BUG_ON(refcount_read(&hp->refcnt) != 0);
226         BUG_ON(!list_empty(&hp->list));
227 
228         kfree(hp->self_base);
229 }
230 
231 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
232         .alloc = mdesc_kmalloc,
233         .free  = mdesc_kfree,
234 };
235 
236 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
237                                         struct mdesc_mem_ops *mops)
238 {
239         struct mdesc_handle *hp = mops->alloc(mdesc_size);
240 
241         if (hp)
242                 hp->mops = mops;
243 
244         return hp;
245 }
246 
247 static void mdesc_free(struct mdesc_handle *hp)
248 {
249         hp->mops->free(hp);
250 }
251 
252 static struct mdesc_handle *cur_mdesc;
253 static LIST_HEAD(mdesc_zombie_list);
254 static DEFINE_SPINLOCK(mdesc_lock);
255 
256 struct mdesc_handle *mdesc_grab(void)
257 {
258         struct mdesc_handle *hp;
259         unsigned long flags;
260 
261         spin_lock_irqsave(&mdesc_lock, flags);
262         hp = cur_mdesc;
263         if (hp)
264                 refcount_inc(&hp->refcnt);
265         spin_unlock_irqrestore(&mdesc_lock, flags);
266 
267         return hp;
268 }
269 EXPORT_SYMBOL(mdesc_grab);
270 
271 void mdesc_release(struct mdesc_handle *hp)
272 {
273         unsigned long flags;
274 
275         spin_lock_irqsave(&mdesc_lock, flags);
276         if (refcount_dec_and_test(&hp->refcnt)) {
277                 list_del_init(&hp->list);
278                 hp->mops->free(hp);
279         }
280         spin_unlock_irqrestore(&mdesc_lock, flags);
281 }
282 EXPORT_SYMBOL(mdesc_release);
283 
284 static DEFINE_MUTEX(mdesc_mutex);
285 static struct mdesc_notifier_client *client_list;
286 
287 void mdesc_register_notifier(struct mdesc_notifier_client *client)
288 {
289         bool supported = false;
290         u64 node;
291         int i;
292 
293         mutex_lock(&mdesc_mutex);
294 
295         /* check to see if the node is supported for registration */
296         for (i = 0; md_node_ops_table[i].name != NULL; i++) {
297                 if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) {
298                         supported = true;
299                         break;
300                 }
301         }
302 
303         if (!supported) {
304                 pr_err("MD: %s node not supported\n", client->node_name);
305                 mutex_unlock(&mdesc_mutex);
306                 return;
307         }
308 
309         client->next = client_list;
310         client_list = client;
311 
312         mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
313                 client->add(cur_mdesc, node, client->node_name);
314 
315         mutex_unlock(&mdesc_mutex);
316 }
317 
318 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
319 {
320         const u64 *id;
321         u64 a;
322 
323         id = NULL;
324         mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
325                 u64 target;
326 
327                 target = mdesc_arc_target(hp, a);
328                 id = mdesc_get_property(hp, target,
329                                         "cfg-handle", NULL);
330                 if (id)
331                         break;
332         }
333 
334         return id;
335 }
336 
337 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node,
338                                    union md_node_info *node_info)
339 {
340         const u64 *parent_cfg_hdlp;
341         const char *name;
342         const u64 *idp;
343 
344         /*
345          * Virtual device nodes are distinguished by:
346          * 1. "id" property
347          * 2. "name" property
348          * 3. parent node "cfg-handle" property
349          */
350         idp = mdesc_get_property(md, node, "id", NULL);
351         name = mdesc_get_property(md, node, "name", NULL);
352         parent_cfg_hdlp = parent_cfg_handle(md, node);
353 
354         if (!idp || !name || !parent_cfg_hdlp)
355                 return -1;
356 
357         node_info->vdev_port.id = *idp;
358         node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL);
359         if (!node_info->vdev_port.name)
360                 return -1;
361         node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp;
362 
363         return 0;
364 }
365 
366 static void rel_vdev_port_node_info(union md_node_info *node_info)
367 {
368         if (node_info && node_info->vdev_port.name) {
369                 kfree_const(node_info->vdev_port.name);
370                 node_info->vdev_port.name = NULL;
371         }
372 }
373 
374 static bool vdev_port_node_match(union md_node_info *a_node_info,
375                                  union md_node_info *b_node_info)
376 {
377         if (a_node_info->vdev_port.id != b_node_info->vdev_port.id)
378                 return false;
379 
380         if (a_node_info->vdev_port.parent_cfg_hdl !=
381             b_node_info->vdev_port.parent_cfg_hdl)
382                 return false;
383 
384         if (strncmp(a_node_info->vdev_port.name,
385                     b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0)
386                 return false;
387 
388         return true;
389 }
390 
391 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node,
392                                  union md_node_info *node_info)
393 {
394         const u64 *idp;
395 
396         /* DS port nodes use the "id" property to distinguish them */
397         idp = mdesc_get_property(md, node, "id", NULL);
398         if (!idp)
399                 return -1;
400 
401         node_info->ds_port.id = *idp;
402 
403         return 0;
404 }
405 
406 static void rel_ds_port_node_info(union md_node_info *node_info)
407 {
408 }
409 
410 static bool ds_port_node_match(union md_node_info *a_node_info,
411                                union md_node_info *b_node_info)
412 {
413         if (a_node_info->ds_port.id != b_node_info->ds_port.id)
414                 return false;
415 
416         return true;
417 }
418 
419 /* Run 'func' on nodes which are in A but not in B.  */
420 static void invoke_on_missing(const char *name,
421                               struct mdesc_handle *a,
422                               struct mdesc_handle *b,
423                               void (*func)(struct mdesc_handle *, u64,
424                                            const char *node_name))
425 {
426         mdesc_node_info_get_f get_info_func;
427         mdesc_node_info_rel_f rel_info_func;
428         mdesc_node_match_f node_match_func;
429         union md_node_info a_node_info;
430         union md_node_info b_node_info;
431         bool found;
432         u64 a_node;
433         u64 b_node;
434         int rv;
435 
436         /*
437          * Find the get_info, rel_info and node_match ops for the given
438          * node name
439          */
440         mdesc_get_node_ops(name, &get_info_func, &rel_info_func,
441                            &node_match_func);
442 
443         /* If we didn't find a match, the node type is not supported */
444         if (!get_info_func || !rel_info_func || !node_match_func) {
445                 pr_err("MD: %s node type is not supported\n", name);
446                 return;
447         }
448 
449         mdesc_for_each_node_by_name(a, a_node, name) {
450                 found = false;
451 
452                 rv = get_info_func(a, a_node, &a_node_info);
453                 if (rv != 0) {
454                         pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
455                                name);
456                         continue;
457                 }
458 
459                 /* Check each node in B for node matching a_node */
460                 mdesc_for_each_node_by_name(b, b_node, name) {
461                         rv = get_info_func(b, b_node, &b_node_info);
462                         if (rv != 0)
463                                 continue;
464 
465                         if (node_match_func(&a_node_info, &b_node_info)) {
466                                 found = true;
467                                 rel_info_func(&b_node_info);
468                                 break;
469                         }
470 
471                         rel_info_func(&b_node_info);
472                 }
473 
474                 rel_info_func(&a_node_info);
475 
476                 if (!found)
477                         func(a, a_node, name);
478         }
479 }
480 
481 static void notify_one(struct mdesc_notifier_client *p,
482                        struct mdesc_handle *old_hp,
483                        struct mdesc_handle *new_hp)
484 {
485         invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
486         invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
487 }
488 
489 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
490                                  struct mdesc_handle *new_hp)
491 {
492         struct mdesc_notifier_client *p = client_list;
493 
494         while (p) {
495                 notify_one(p, old_hp, new_hp);
496                 p = p->next;
497         }
498 }
499 
500 void mdesc_update(void)
501 {
502         unsigned long len, real_len, status;
503         struct mdesc_handle *hp, *orig_hp;
504         unsigned long flags;
505 
506         mutex_lock(&mdesc_mutex);
507 
508         (void) sun4v_mach_desc(0UL, 0UL, &len);
509 
510         hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
511         if (!hp) {
512                 printk(KERN_ERR "MD: mdesc alloc fails\n");
513                 goto out;
514         }
515 
516         status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
517         if (status != HV_EOK || real_len > len) {
518                 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
519                        status);
520                 refcount_dec(&hp->refcnt);
521                 mdesc_free(hp);
522                 goto out;
523         }
524 
525         spin_lock_irqsave(&mdesc_lock, flags);
526         orig_hp = cur_mdesc;
527         cur_mdesc = hp;
528         spin_unlock_irqrestore(&mdesc_lock, flags);
529 
530         mdesc_notify_clients(orig_hp, hp);
531 
532         spin_lock_irqsave(&mdesc_lock, flags);
533         if (refcount_dec_and_test(&orig_hp->refcnt))
534                 mdesc_free(orig_hp);
535         else
536                 list_add(&orig_hp->list, &mdesc_zombie_list);
537         spin_unlock_irqrestore(&mdesc_lock, flags);
538 
539 out:
540         mutex_unlock(&mdesc_mutex);
541 }
542 
543 u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
544                    union md_node_info *node_info)
545 {
546         mdesc_node_info_get_f get_info_func;
547         mdesc_node_info_rel_f rel_info_func;
548         mdesc_node_match_f node_match_func;
549         union md_node_info hp_node_info;
550         u64 hp_node;
551         int rv;
552 
553         if (hp == NULL || node_name == NULL || node_info == NULL)
554                 return MDESC_NODE_NULL;
555 
556         /* Find the ops for the given node name */
557         mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func,
558                            &node_match_func);
559 
560         /* If we didn't find ops for the given node name, it is not supported */
561         if (!get_info_func || !rel_info_func || !node_match_func) {
562                 pr_err("MD: %s node is not supported\n", node_name);
563                 return -EINVAL;
564         }
565 
566         mdesc_for_each_node_by_name(hp, hp_node, node_name) {
567                 rv = get_info_func(hp, hp_node, &hp_node_info);
568                 if (rv != 0)
569                         continue;
570 
571                 if (node_match_func(node_info, &hp_node_info))
572                         break;
573 
574                 rel_info_func(&hp_node_info);
575         }
576 
577         rel_info_func(&hp_node_info);
578 
579         return hp_node;
580 }
581 EXPORT_SYMBOL(mdesc_get_node);
582 
583 int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
584                         const char *node_name, union md_node_info *node_info)
585 {
586         mdesc_node_info_get_f get_info_func;
587         int rv;
588 
589         if (hp == NULL || node == MDESC_NODE_NULL ||
590             node_name == NULL || node_info == NULL)
591                 return -EINVAL;
592 
593         /* Find the get_info op for the given node name */
594         mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL);
595 
596         /* If we didn't find a get_info_func, the node name is not supported */
597         if (get_info_func == NULL) {
598                 pr_err("MD: %s node is not supported\n", node_name);
599                 return -EINVAL;
600         }
601 
602         rv = get_info_func(hp, node, node_info);
603         if (rv != 0) {
604                 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n",
605                        node_name);
606                 return -1;
607         }
608 
609         return 0;
610 }
611 EXPORT_SYMBOL(mdesc_get_node_info);
612 
613 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
614 {
615         return (struct mdesc_elem *) (mdesc + 1);
616 }
617 
618 static void *name_block(struct mdesc_hdr *mdesc)
619 {
620         return ((void *) node_block(mdesc)) + mdesc->node_sz;
621 }
622 
623 static void *data_block(struct mdesc_hdr *mdesc)
624 {
625         return ((void *) name_block(mdesc)) + mdesc->name_sz;
626 }
627 
628 u64 mdesc_node_by_name(struct mdesc_handle *hp,
629                        u64 from_node, const char *name)
630 {
631         struct mdesc_elem *ep = node_block(&hp->mdesc);
632         const char *names = name_block(&hp->mdesc);
633         u64 last_node = hp->mdesc.node_sz / 16;
634         u64 ret;
635 
636         if (from_node == MDESC_NODE_NULL) {
637                 ret = from_node = 0;
638         } else if (from_node >= last_node) {
639                 return MDESC_NODE_NULL;
640         } else {
641                 ret = ep[from_node].d.val;
642         }
643 
644         while (ret < last_node) {
645                 if (ep[ret].tag != MD_NODE)
646                         return MDESC_NODE_NULL;
647                 if (!strcmp(names + ep[ret].name_offset, name))
648                         break;
649                 ret = ep[ret].d.val;
650         }
651         if (ret >= last_node)
652                 ret = MDESC_NODE_NULL;
653         return ret;
654 }
655 EXPORT_SYMBOL(mdesc_node_by_name);
656 
657 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
658                                const char *name, int *lenp)
659 {
660         const char *names = name_block(&hp->mdesc);
661         u64 last_node = hp->mdesc.node_sz / 16;
662         void *data = data_block(&hp->mdesc);
663         struct mdesc_elem *ep;
664 
665         if (node == MDESC_NODE_NULL || node >= last_node)
666                 return NULL;
667 
668         ep = node_block(&hp->mdesc) + node;
669         ep++;
670         for (; ep->tag != MD_NODE_END; ep++) {
671                 void *val = NULL;
672                 int len = 0;
673 
674                 switch (ep->tag) {
675                 case MD_PROP_VAL:
676                         val = &ep->d.val;
677                         len = 8;
678                         break;
679 
680                 case MD_PROP_STR:
681                 case MD_PROP_DATA:
682                         val = data + ep->d.data.data_offset;
683                         len = ep->d.data.data_len;
684                         break;
685 
686                 default:
687                         break;
688                 }
689                 if (!val)
690                         continue;
691 
692                 if (!strcmp(names + ep->name_offset, name)) {
693                         if (lenp)
694                                 *lenp = len;
695                         return val;
696                 }
697         }
698 
699         return NULL;
700 }
701 EXPORT_SYMBOL(mdesc_get_property);
702 
703 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
704 {
705         struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
706         const char *names = name_block(&hp->mdesc);
707         u64 last_node = hp->mdesc.node_sz / 16;
708 
709         if (from == MDESC_NODE_NULL || from >= last_node)
710                 return MDESC_NODE_NULL;
711 
712         ep = base + from;
713 
714         ep++;
715         for (; ep->tag != MD_NODE_END; ep++) {
716                 if (ep->tag != MD_PROP_ARC)
717                         continue;
718 
719                 if (strcmp(names + ep->name_offset, arc_type))
720                         continue;
721 
722                 return ep - base;
723         }
724 
725         return MDESC_NODE_NULL;
726 }
727 EXPORT_SYMBOL(mdesc_next_arc);
728 
729 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
730 {
731         struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
732 
733         ep = base + arc;
734 
735         return ep->d.val;
736 }
737 EXPORT_SYMBOL(mdesc_arc_target);
738 
739 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
740 {
741         struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
742         const char *names = name_block(&hp->mdesc);
743         u64 last_node = hp->mdesc.node_sz / 16;
744 
745         if (node == MDESC_NODE_NULL || node >= last_node)
746                 return NULL;
747 
748         ep = base + node;
749         if (ep->tag != MD_NODE)
750                 return NULL;
751 
752         return names + ep->name_offset;
753 }
754 EXPORT_SYMBOL(mdesc_node_name);
755 
756 static u64 max_cpus = 64;
757 
758 static void __init report_platform_properties(void)
759 {
760         struct mdesc_handle *hp = mdesc_grab();
761         u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
762         const char *s;
763         const u64 *v;
764 
765         if (pn == MDESC_NODE_NULL) {
766                 prom_printf("No platform node in machine-description.\n");
767                 prom_halt();
768         }
769 
770         s = mdesc_get_property(hp, pn, "banner-name", NULL);
771         printk("PLATFORM: banner-name [%s]\n", s);
772         s = mdesc_get_property(hp, pn, "name", NULL);
773         printk("PLATFORM: name [%s]\n", s);
774 
775         v = mdesc_get_property(hp, pn, "hostid", NULL);
776         if (v)
777                 printk("PLATFORM: hostid [%08llx]\n", *v);
778         v = mdesc_get_property(hp, pn, "serial#", NULL);
779         if (v)
780                 printk("PLATFORM: serial# [%08llx]\n", *v);
781         v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
782         printk("PLATFORM: stick-frequency [%08llx]\n", *v);
783         v = mdesc_get_property(hp, pn, "mac-address", NULL);
784         if (v)
785                 printk("PLATFORM: mac-address [%llx]\n", *v);
786         v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
787         if (v)
788                 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
789         v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
790         if (v)
791                 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
792         v = mdesc_get_property(hp, pn, "max-cpus", NULL);
793         if (v) {
794                 max_cpus = *v;
795                 printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
796         }
797 
798 #ifdef CONFIG_SMP
799         {
800                 int max_cpu, i;
801 
802                 if (v) {
803                         max_cpu = *v;
804                         if (max_cpu > NR_CPUS)
805                                 max_cpu = NR_CPUS;
806                 } else {
807                         max_cpu = NR_CPUS;
808                 }
809                 for (i = 0; i < max_cpu; i++)
810                         set_cpu_possible(i, true);
811         }
812 #endif
813 
814         mdesc_release(hp);
815 }
816 
817 static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp)
818 {
819         const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
820         const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
821         const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
822         const char *type;
823         int type_len;
824 
825         type = mdesc_get_property(hp, mp, "type", &type_len);
826 
827         switch (*level) {
828         case 1:
829                 if (of_find_in_proplist(type, "instn", type_len)) {
830                         c->icache_size = *size;
831                         c->icache_line_size = *line_size;
832                 } else if (of_find_in_proplist(type, "data", type_len)) {
833                         c->dcache_size = *size;
834                         c->dcache_line_size = *line_size;
835                 }
836                 break;
837 
838         case 2:
839                 c->ecache_size = *size;
840                 c->ecache_line_size = *line_size;
841                 break;
842 
843         default:
844                 break;
845         }
846 
847         if (*level == 1) {
848                 u64 a;
849 
850                 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
851                         u64 target = mdesc_arc_target(hp, a);
852                         const char *name = mdesc_node_name(hp, target);
853 
854                         if (!strcmp(name, "cache"))
855                                 fill_in_one_cache(c, hp, target);
856                 }
857         }
858 }
859 
860 static void find_back_node_value(struct mdesc_handle *hp, u64 node,
861                                  char *srch_val,
862                                  void (*func)(struct mdesc_handle *, u64, int),
863                                  u64 val, int depth)
864 {
865         u64 arc;
866 
867         /* Since we have an estimate of recursion depth, do a sanity check. */
868         if (depth == 0)
869                 return;
870 
871         mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) {
872                 u64 n = mdesc_arc_target(hp, arc);
873                 const char *name = mdesc_node_name(hp, n);
874 
875                 if (!strcmp(srch_val, name))
876                         (*func)(hp, n, val);
877 
878                 find_back_node_value(hp, n, srch_val, func, val, depth-1);
879         }
880 }
881 
882 static void __mark_core_id(struct mdesc_handle *hp, u64 node,
883                            int core_id)
884 {
885         const u64 *id = mdesc_get_property(hp, node, "id", NULL);
886 
887         if (*id < num_possible_cpus())
888                 cpu_data(*id).core_id = core_id;
889 }
890 
891 static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node,
892                                 int max_cache_id)
893 {
894         const u64 *id = mdesc_get_property(hp, node, "id", NULL);
895 
896         if (*id < num_possible_cpus()) {
897                 cpu_data(*id).max_cache_id = max_cache_id;
898 
899                 /**
900                  * On systems without explicit socket descriptions socket
901                  * is max_cache_id
902                  */
903                 cpu_data(*id).sock_id = max_cache_id;
904         }
905 }
906 
907 static void mark_core_ids(struct mdesc_handle *hp, u64 mp,
908                           int core_id)
909 {
910         find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10);
911 }
912 
913 static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp,
914                                int max_cache_id)
915 {
916         find_back_node_value(hp, mp, "cpu", __mark_max_cache_id,
917                              max_cache_id, 10);
918 }
919 
920 static void set_core_ids(struct mdesc_handle *hp)
921 {
922         int idx;
923         u64 mp;
924 
925         idx = 1;
926 
927         /* Identify unique cores by looking for cpus backpointed to by
928          * level 1 instruction caches.
929          */
930         mdesc_for_each_node_by_name(hp, mp, "cache") {
931                 const u64 *level;
932                 const char *type;
933                 int len;
934 
935                 level = mdesc_get_property(hp, mp, "level", NULL);
936                 if (*level != 1)
937                         continue;
938 
939                 type = mdesc_get_property(hp, mp, "type", &len);
940                 if (!of_find_in_proplist(type, "instn", len))
941                         continue;
942 
943                 mark_core_ids(hp, mp, idx);
944                 idx++;
945         }
946 }
947 
948 static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level)
949 {
950         u64 mp;
951         int idx = 1;
952         int fnd = 0;
953 
954         /**
955          * Identify unique highest level of shared cache by looking for cpus
956          * backpointed to by shared level N caches.
957          */
958         mdesc_for_each_node_by_name(hp, mp, "cache") {
959                 const u64 *cur_lvl;
960 
961                 cur_lvl = mdesc_get_property(hp, mp, "level", NULL);
962                 if (*cur_lvl != level)
963                         continue;
964                 mark_max_cache_ids(hp, mp, idx);
965                 idx++;
966                 fnd = 1;
967         }
968         return fnd;
969 }
970 
971 static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp)
972 {
973         int idx = 1;
974 
975         mdesc_for_each_node_by_name(hp, mp, "socket") {
976                 u64 a;
977 
978                 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
979                         u64 t = mdesc_arc_target(hp, a);
980                         const char *name;
981                         const u64 *id;
982 
983                         name = mdesc_node_name(hp, t);
984                         if (strcmp(name, "cpu"))
985                                 continue;
986 
987                         id = mdesc_get_property(hp, t, "id", NULL);
988                         if (*id < num_possible_cpus())
989                                 cpu_data(*id).sock_id = idx;
990                 }
991                 idx++;
992         }
993 }
994 
995 static void set_sock_ids(struct mdesc_handle *hp)
996 {
997         u64 mp;
998 
999         /**
1000          * Find the highest level of shared cache which pre-T7 is also
1001          * the socket.
1002          */
1003         if (!set_max_cache_ids_by_cache(hp, 3))
1004                 set_max_cache_ids_by_cache(hp, 2);
1005 
1006         /* If machine description exposes sockets data use it.*/
1007         mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets");
1008         if (mp != MDESC_NODE_NULL)
1009                 set_sock_ids_by_socket(hp, mp);
1010 }
1011 
1012 static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
1013 {
1014         u64 a;
1015 
1016         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
1017                 u64 t = mdesc_arc_target(hp, a);
1018                 const char *name;
1019                 const u64 *id;
1020 
1021                 name = mdesc_node_name(hp, t);
1022                 if (strcmp(name, "cpu"))
1023                         continue;
1024 
1025                 id = mdesc_get_property(hp, t, "id", NULL);
1026                 if (*id < NR_CPUS)
1027                         cpu_data(*id).proc_id = proc_id;
1028         }
1029 }
1030 
1031 static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
1032 {
1033         int idx;
1034         u64 mp;
1035 
1036         idx = 0;
1037         mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
1038                 const char *type;
1039                 int len;
1040 
1041                 type = mdesc_get_property(hp, mp, "type", &len);
1042                 if (!of_find_in_proplist(type, "int", len) &&
1043                     !of_find_in_proplist(type, "integer", len))
1044                         continue;
1045 
1046                 mark_proc_ids(hp, mp, idx);
1047                 idx++;
1048         }
1049 }
1050 
1051 static void set_proc_ids(struct mdesc_handle *hp)
1052 {
1053         __set_proc_ids(hp, "exec_unit");
1054         __set_proc_ids(hp, "exec-unit");
1055 }
1056 
1057 static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
1058                                unsigned long def, unsigned long max)
1059 {
1060         u64 val;
1061 
1062         if (!p)
1063                 goto use_default;
1064         val = *p;
1065 
1066         if (!val || val >= 64)
1067                 goto use_default;
1068 
1069         if (val > max)
1070                 val = max;
1071 
1072         *mask = ((1U << val) * 64U) - 1U;
1073         return;
1074 
1075 use_default:
1076         *mask = ((1U << def) * 64U) - 1U;
1077 }
1078 
1079 static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
1080                            struct trap_per_cpu *tb)
1081 {
1082         static int printed;
1083         const u64 *val;
1084 
1085         val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
1086         get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
1087 
1088         val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
1089         get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
1090 
1091         val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
1092         get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
1093 
1094         val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
1095         get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
1096         if (!printed++) {
1097                 pr_info("SUN4V: Mondo queue sizes "
1098                         "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
1099                         tb->cpu_mondo_qmask + 1,
1100                         tb->dev_mondo_qmask + 1,
1101                         tb->resum_qmask + 1,
1102                         tb->nonresum_qmask + 1);
1103         }
1104 }
1105 
1106 static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
1107 {
1108         struct mdesc_handle *hp = mdesc_grab();
1109         void *ret = NULL;
1110         u64 mp;
1111 
1112         mdesc_for_each_node_by_name(hp, mp, "cpu") {
1113                 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
1114                 int cpuid = *id;
1115 
1116 #ifdef CONFIG_SMP
1117                 if (cpuid >= NR_CPUS) {
1118                         printk(KERN_WARNING "Ignoring CPU %d which is "
1119                                ">= NR_CPUS (%d)\n",
1120                                cpuid, NR_CPUS);
1121                         continue;
1122                 }
1123                 if (!cpumask_test_cpu(cpuid, mask))
1124                         continue;
1125 #endif
1126 
1127                 ret = func(hp, mp, cpuid, arg);
1128                 if (ret)
1129                         goto out;
1130         }
1131 out:
1132         mdesc_release(hp);
1133         return ret;
1134 }
1135 
1136 static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
1137                             void *arg)
1138 {
1139         ncpus_probed++;
1140 #ifdef CONFIG_SMP
1141         set_cpu_present(cpuid, true);
1142 #endif
1143         return NULL;
1144 }
1145 
1146 void mdesc_populate_present_mask(cpumask_t *mask)
1147 {
1148         if (tlb_type != hypervisor)
1149                 return;
1150 
1151         ncpus_probed = 0;
1152         mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
1153 }
1154 
1155 static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
1156 {
1157         const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
1158         unsigned long *pgsz_mask = arg;
1159         u64 val;
1160 
1161         val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
1162                HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
1163         if (pgsz_prop)
1164                 val = *pgsz_prop;
1165 
1166         if (!*pgsz_mask)
1167                 *pgsz_mask = val;
1168         else
1169                 *pgsz_mask &= val;
1170         return NULL;
1171 }
1172 
1173 void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
1174 {
1175         *pgsz_mask = 0;
1176         mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
1177 }
1178 
1179 static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
1180                              void *arg)
1181 {
1182         const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
1183         struct trap_per_cpu *tb;
1184         cpuinfo_sparc *c;
1185         u64 a;
1186 
1187 #ifndef CONFIG_SMP
1188         /* On uniprocessor we only want the values for the
1189          * real physical cpu the kernel booted onto, however
1190          * cpu_data() only has one entry at index 0.
1191          */
1192         if (cpuid != real_hard_smp_processor_id())
1193                 return NULL;
1194         cpuid = 0;
1195 #endif
1196 
1197         c = &cpu_data(cpuid);
1198         c->clock_tick = *cfreq;
1199 
1200         tb = &trap_block[cpuid];
1201         get_mondo_data(hp, mp, tb);
1202 
1203         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
1204                 u64 j, t = mdesc_arc_target(hp, a);
1205                 const char *t_name;
1206 
1207                 t_name = mdesc_node_name(hp, t);
1208                 if (!strcmp(t_name, "cache")) {
1209                         fill_in_one_cache(c, hp, t);
1210                         continue;
1211                 }
1212 
1213                 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
1214                         u64 n = mdesc_arc_target(hp, j);
1215                         const char *n_name;
1216 
1217                         n_name = mdesc_node_name(hp, n);
1218                         if (!strcmp(n_name, "cache"))
1219                                 fill_in_one_cache(c, hp, n);
1220                 }
1221         }
1222 
1223         c->core_id = 0;
1224         c->proc_id = -1;
1225 
1226         return NULL;
1227 }
1228 
1229 void mdesc_fill_in_cpu_data(cpumask_t *mask)
1230 {
1231         struct mdesc_handle *hp;
1232 
1233         mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
1234 
1235         hp = mdesc_grab();
1236 
1237         set_core_ids(hp);
1238         set_proc_ids(hp);
1239         set_sock_ids(hp);
1240 
1241         mdesc_release(hp);
1242 
1243         smp_fill_in_sib_core_maps();
1244 }
1245 
1246 /* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is
1247  * opened. Hold this reference until /dev/mdesc is closed to ensure
1248  * mdesc data structure is not released underneath us. Store the
1249  * pointer to mdesc structure in private_data for read and seek to use
1250  */
1251 static int mdesc_open(struct inode *inode, struct file *file)
1252 {
1253         struct mdesc_handle *hp = mdesc_grab();
1254 
1255         if (!hp)
1256                 return -ENODEV;
1257 
1258         file->private_data = hp;
1259 
1260         return 0;
1261 }
1262 
1263 static ssize_t mdesc_read(struct file *file, char __user *buf,
1264                           size_t len, loff_t *offp)
1265 {
1266         struct mdesc_handle *hp = file->private_data;
1267         unsigned char *mdesc;
1268         int bytes_left, count = len;
1269 
1270         if (*offp >= hp->handle_size)
1271                 return 0;
1272 
1273         bytes_left = hp->handle_size - *offp;
1274         if (count > bytes_left)
1275                 count = bytes_left;
1276 
1277         mdesc = (unsigned char *)&hp->mdesc;
1278         mdesc += *offp;
1279         if (!copy_to_user(buf, mdesc, count)) {
1280                 *offp += count;
1281                 return count;
1282         } else {
1283                 return -EFAULT;
1284         }
1285 }
1286 
1287 static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
1288 {
1289         struct mdesc_handle *hp = file->private_data;
1290 
1291         return no_seek_end_llseek_size(file, offset, whence, hp->handle_size);
1292 }
1293 
1294 /* mdesc_close() - /dev/mdesc is being closed, release the reference to
1295  * mdesc structure.
1296  */
1297 static int mdesc_close(struct inode *inode, struct file *file)
1298 {
1299         mdesc_release(file->private_data);
1300         return 0;
1301 }
1302 
1303 static const struct file_operations mdesc_fops = {
1304         .open    = mdesc_open,
1305         .read    = mdesc_read,
1306         .llseek  = mdesc_llseek,
1307         .release = mdesc_close,
1308         .owner   = THIS_MODULE,
1309 };
1310 
1311 static struct miscdevice mdesc_misc = {
1312         .minor  = MISC_DYNAMIC_MINOR,
1313         .name   = "mdesc",
1314         .fops   = &mdesc_fops,
1315 };
1316 
1317 static int __init mdesc_misc_init(void)
1318 {
1319         return misc_register(&mdesc_misc);
1320 }
1321 
1322 __initcall(mdesc_misc_init);
1323 
1324 void __init sun4v_mdesc_init(void)
1325 {
1326         struct mdesc_handle *hp;
1327         unsigned long len, real_len, status;
1328 
1329         (void) sun4v_mach_desc(0UL, 0UL, &len);
1330 
1331         printk("MDESC: Size is %lu bytes.\n", len);
1332 
1333         hp = mdesc_alloc(len, &memblock_mdesc_ops);
1334         if (hp == NULL) {
1335                 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
1336                 prom_halt();
1337         }
1338 
1339         status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
1340         if (status != HV_EOK || real_len > len) {
1341                 prom_printf("sun4v_mach_desc fails, err(%lu), "
1342                             "len(%lu), real_len(%lu)\n",
1343                             status, len, real_len);
1344                 mdesc_free(hp);
1345                 prom_halt();
1346         }
1347 
1348         cur_mdesc = hp;
1349 
1350         mdesc_adi_init();
1351         report_platform_properties();
1352 }
1353 

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