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

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  1 /* mdesc.c: Sun4V machine description handling.
  2  *
  3  * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
  4  */
  5 #include <linux/kernel.h>
  6 #include <linux/types.h>
  7 #include <linux/memblock.h>
  8 #include <linux/log2.h>
  9 #include <linux/list.h>
 10 #include <linux/slab.h>
 11 #include <linux/mm.h>
 12 #include <linux/miscdevice.h>
 13 #include <linux/bootmem.h>
 14 
 15 #include <asm/cpudata.h>
 16 #include <asm/hypervisor.h>
 17 #include <asm/mdesc.h>
 18 #include <asm/prom.h>
 19 #include <asm/oplib.h>
 20 #include <asm/smp.h>
 21 
 22 /* Unlike the OBP device tree, the machine description is a full-on
 23  * DAG.  An arbitrary number of ARCs are possible from one
 24  * node to other nodes and thus we can't use the OBP device_node
 25  * data structure to represent these nodes inside of the kernel.
 26  *
 27  * Actually, it isn't even a DAG, because there are back pointers
 28  * which create cycles in the graph.
 29  *
 30  * mdesc_hdr and mdesc_elem describe the layout of the data structure
 31  * we get from the Hypervisor.
 32  */
 33 struct mdesc_hdr {
 34         u32     version; /* Transport version */
 35         u32     node_sz; /* node block size */
 36         u32     name_sz; /* name block size */
 37         u32     data_sz; /* data block size */
 38 } __attribute__((aligned(16)));
 39 
 40 struct mdesc_elem {
 41         u8      tag;
 42 #define MD_LIST_END     0x00
 43 #define MD_NODE         0x4e
 44 #define MD_NODE_END     0x45
 45 #define MD_NOOP         0x20
 46 #define MD_PROP_ARC     0x61
 47 #define MD_PROP_VAL     0x76
 48 #define MD_PROP_STR     0x73
 49 #define MD_PROP_DATA    0x64
 50         u8      name_len;
 51         u16     resv;
 52         u32     name_offset;
 53         union {
 54                 struct {
 55                         u32     data_len;
 56                         u32     data_offset;
 57                 } data;
 58                 u64     val;
 59         } d;
 60 };
 61 
 62 struct mdesc_mem_ops {
 63         struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
 64         void (*free)(struct mdesc_handle *handle);
 65 };
 66 
 67 struct mdesc_handle {
 68         struct list_head        list;
 69         struct mdesc_mem_ops    *mops;
 70         void                    *self_base;
 71         atomic_t                refcnt;
 72         unsigned int            handle_size;
 73         struct mdesc_hdr        mdesc;
 74 };
 75 
 76 static void mdesc_handle_init(struct mdesc_handle *hp,
 77                               unsigned int handle_size,
 78                               void *base)
 79 {
 80         BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
 81 
 82         memset(hp, 0, handle_size);
 83         INIT_LIST_HEAD(&hp->list);
 84         hp->self_base = base;
 85         atomic_set(&hp->refcnt, 1);
 86         hp->handle_size = handle_size;
 87 }
 88 
 89 static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
 90 {
 91         unsigned int handle_size, alloc_size;
 92         struct mdesc_handle *hp;
 93         unsigned long paddr;
 94 
 95         handle_size = (sizeof(struct mdesc_handle) -
 96                        sizeof(struct mdesc_hdr) +
 97                        mdesc_size);
 98         alloc_size = PAGE_ALIGN(handle_size);
 99 
100         paddr = memblock_alloc(alloc_size, PAGE_SIZE);
101 
102         hp = NULL;
103         if (paddr) {
104                 hp = __va(paddr);
105                 mdesc_handle_init(hp, handle_size, hp);
106         }
107         return hp;
108 }
109 
110 static void __init mdesc_memblock_free(struct mdesc_handle *hp)
111 {
112         unsigned int alloc_size;
113         unsigned long start;
114 
115         BUG_ON(atomic_read(&hp->refcnt) != 0);
116         BUG_ON(!list_empty(&hp->list));
117 
118         alloc_size = PAGE_ALIGN(hp->handle_size);
119         start = __pa(hp);
120         free_bootmem_late(start, alloc_size);
121 }
122 
123 static struct mdesc_mem_ops memblock_mdesc_ops = {
124         .alloc = mdesc_memblock_alloc,
125         .free  = mdesc_memblock_free,
126 };
127 
128 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
129 {
130         unsigned int handle_size;
131         void *base;
132 
133         handle_size = (sizeof(struct mdesc_handle) -
134                        sizeof(struct mdesc_hdr) +
135                        mdesc_size);
136 
137         base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
138         if (base) {
139                 struct mdesc_handle *hp;
140                 unsigned long addr;
141 
142                 addr = (unsigned long)base;
143                 addr = (addr + 15UL) & ~15UL;
144                 hp = (struct mdesc_handle *) addr;
145 
146                 mdesc_handle_init(hp, handle_size, base);
147                 return hp;
148         }
149 
150         return NULL;
151 }
152 
153 static void mdesc_kfree(struct mdesc_handle *hp)
154 {
155         BUG_ON(atomic_read(&hp->refcnt) != 0);
156         BUG_ON(!list_empty(&hp->list));
157 
158         kfree(hp->self_base);
159 }
160 
161 static struct mdesc_mem_ops kmalloc_mdesc_memops = {
162         .alloc = mdesc_kmalloc,
163         .free  = mdesc_kfree,
164 };
165 
166 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
167                                         struct mdesc_mem_ops *mops)
168 {
169         struct mdesc_handle *hp = mops->alloc(mdesc_size);
170 
171         if (hp)
172                 hp->mops = mops;
173 
174         return hp;
175 }
176 
177 static void mdesc_free(struct mdesc_handle *hp)
178 {
179         hp->mops->free(hp);
180 }
181 
182 static struct mdesc_handle *cur_mdesc;
183 static LIST_HEAD(mdesc_zombie_list);
184 static DEFINE_SPINLOCK(mdesc_lock);
185 
186 struct mdesc_handle *mdesc_grab(void)
187 {
188         struct mdesc_handle *hp;
189         unsigned long flags;
190 
191         spin_lock_irqsave(&mdesc_lock, flags);
192         hp = cur_mdesc;
193         if (hp)
194                 atomic_inc(&hp->refcnt);
195         spin_unlock_irqrestore(&mdesc_lock, flags);
196 
197         return hp;
198 }
199 EXPORT_SYMBOL(mdesc_grab);
200 
201 void mdesc_release(struct mdesc_handle *hp)
202 {
203         unsigned long flags;
204 
205         spin_lock_irqsave(&mdesc_lock, flags);
206         if (atomic_dec_and_test(&hp->refcnt)) {
207                 list_del_init(&hp->list);
208                 hp->mops->free(hp);
209         }
210         spin_unlock_irqrestore(&mdesc_lock, flags);
211 }
212 EXPORT_SYMBOL(mdesc_release);
213 
214 static DEFINE_MUTEX(mdesc_mutex);
215 static struct mdesc_notifier_client *client_list;
216 
217 void mdesc_register_notifier(struct mdesc_notifier_client *client)
218 {
219         u64 node;
220 
221         mutex_lock(&mdesc_mutex);
222         client->next = client_list;
223         client_list = client;
224 
225         mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
226                 client->add(cur_mdesc, node);
227 
228         mutex_unlock(&mdesc_mutex);
229 }
230 
231 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
232 {
233         const u64 *id;
234         u64 a;
235 
236         id = NULL;
237         mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
238                 u64 target;
239 
240                 target = mdesc_arc_target(hp, a);
241                 id = mdesc_get_property(hp, target,
242                                         "cfg-handle", NULL);
243                 if (id)
244                         break;
245         }
246 
247         return id;
248 }
249 
250 /* Run 'func' on nodes which are in A but not in B.  */
251 static void invoke_on_missing(const char *name,
252                               struct mdesc_handle *a,
253                               struct mdesc_handle *b,
254                               void (*func)(struct mdesc_handle *, u64))
255 {
256         u64 node;
257 
258         mdesc_for_each_node_by_name(a, node, name) {
259                 int found = 0, is_vdc_port = 0;
260                 const char *name_prop;
261                 const u64 *id;
262                 u64 fnode;
263 
264                 name_prop = mdesc_get_property(a, node, "name", NULL);
265                 if (name_prop && !strcmp(name_prop, "vdc-port")) {
266                         is_vdc_port = 1;
267                         id = parent_cfg_handle(a, node);
268                 } else
269                         id = mdesc_get_property(a, node, "id", NULL);
270 
271                 if (!id) {
272                         printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
273                                (name_prop ? name_prop : name));
274                         continue;
275                 }
276 
277                 mdesc_for_each_node_by_name(b, fnode, name) {
278                         const u64 *fid;
279 
280                         if (is_vdc_port) {
281                                 name_prop = mdesc_get_property(b, fnode,
282                                                                "name", NULL);
283                                 if (!name_prop ||
284                                     strcmp(name_prop, "vdc-port"))
285                                         continue;
286                                 fid = parent_cfg_handle(b, fnode);
287                                 if (!fid) {
288                                         printk(KERN_ERR "MD: Cannot find ID "
289                                                "for vdc-port node.\n");
290                                         continue;
291                                 }
292                         } else
293                                 fid = mdesc_get_property(b, fnode,
294                                                          "id", NULL);
295 
296                         if (*id == *fid) {
297                                 found = 1;
298                                 break;
299                         }
300                 }
301                 if (!found)
302                         func(a, node);
303         }
304 }
305 
306 static void notify_one(struct mdesc_notifier_client *p,
307                        struct mdesc_handle *old_hp,
308                        struct mdesc_handle *new_hp)
309 {
310         invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
311         invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
312 }
313 
314 static void mdesc_notify_clients(struct mdesc_handle *old_hp,
315                                  struct mdesc_handle *new_hp)
316 {
317         struct mdesc_notifier_client *p = client_list;
318 
319         while (p) {
320                 notify_one(p, old_hp, new_hp);
321                 p = p->next;
322         }
323 }
324 
325 void mdesc_update(void)
326 {
327         unsigned long len, real_len, status;
328         struct mdesc_handle *hp, *orig_hp;
329         unsigned long flags;
330 
331         mutex_lock(&mdesc_mutex);
332 
333         (void) sun4v_mach_desc(0UL, 0UL, &len);
334 
335         hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
336         if (!hp) {
337                 printk(KERN_ERR "MD: mdesc alloc fails\n");
338                 goto out;
339         }
340 
341         status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
342         if (status != HV_EOK || real_len > len) {
343                 printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
344                        status);
345                 atomic_dec(&hp->refcnt);
346                 mdesc_free(hp);
347                 goto out;
348         }
349 
350         spin_lock_irqsave(&mdesc_lock, flags);
351         orig_hp = cur_mdesc;
352         cur_mdesc = hp;
353         spin_unlock_irqrestore(&mdesc_lock, flags);
354 
355         mdesc_notify_clients(orig_hp, hp);
356 
357         spin_lock_irqsave(&mdesc_lock, flags);
358         if (atomic_dec_and_test(&orig_hp->refcnt))
359                 mdesc_free(orig_hp);
360         else
361                 list_add(&orig_hp->list, &mdesc_zombie_list);
362         spin_unlock_irqrestore(&mdesc_lock, flags);
363 
364 out:
365         mutex_unlock(&mdesc_mutex);
366 }
367 
368 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
369 {
370         return (struct mdesc_elem *) (mdesc + 1);
371 }
372 
373 static void *name_block(struct mdesc_hdr *mdesc)
374 {
375         return ((void *) node_block(mdesc)) + mdesc->node_sz;
376 }
377 
378 static void *data_block(struct mdesc_hdr *mdesc)
379 {
380         return ((void *) name_block(mdesc)) + mdesc->name_sz;
381 }
382 
383 u64 mdesc_node_by_name(struct mdesc_handle *hp,
384                        u64 from_node, const char *name)
385 {
386         struct mdesc_elem *ep = node_block(&hp->mdesc);
387         const char *names = name_block(&hp->mdesc);
388         u64 last_node = hp->mdesc.node_sz / 16;
389         u64 ret;
390 
391         if (from_node == MDESC_NODE_NULL) {
392                 ret = from_node = 0;
393         } else if (from_node >= last_node) {
394                 return MDESC_NODE_NULL;
395         } else {
396                 ret = ep[from_node].d.val;
397         }
398 
399         while (ret < last_node) {
400                 if (ep[ret].tag != MD_NODE)
401                         return MDESC_NODE_NULL;
402                 if (!strcmp(names + ep[ret].name_offset, name))
403                         break;
404                 ret = ep[ret].d.val;
405         }
406         if (ret >= last_node)
407                 ret = MDESC_NODE_NULL;
408         return ret;
409 }
410 EXPORT_SYMBOL(mdesc_node_by_name);
411 
412 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
413                                const char *name, int *lenp)
414 {
415         const char *names = name_block(&hp->mdesc);
416         u64 last_node = hp->mdesc.node_sz / 16;
417         void *data = data_block(&hp->mdesc);
418         struct mdesc_elem *ep;
419 
420         if (node == MDESC_NODE_NULL || node >= last_node)
421                 return NULL;
422 
423         ep = node_block(&hp->mdesc) + node;
424         ep++;
425         for (; ep->tag != MD_NODE_END; ep++) {
426                 void *val = NULL;
427                 int len = 0;
428 
429                 switch (ep->tag) {
430                 case MD_PROP_VAL:
431                         val = &ep->d.val;
432                         len = 8;
433                         break;
434 
435                 case MD_PROP_STR:
436                 case MD_PROP_DATA:
437                         val = data + ep->d.data.data_offset;
438                         len = ep->d.data.data_len;
439                         break;
440 
441                 default:
442                         break;
443                 }
444                 if (!val)
445                         continue;
446 
447                 if (!strcmp(names + ep->name_offset, name)) {
448                         if (lenp)
449                                 *lenp = len;
450                         return val;
451                 }
452         }
453 
454         return NULL;
455 }
456 EXPORT_SYMBOL(mdesc_get_property);
457 
458 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
459 {
460         struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
461         const char *names = name_block(&hp->mdesc);
462         u64 last_node = hp->mdesc.node_sz / 16;
463 
464         if (from == MDESC_NODE_NULL || from >= last_node)
465                 return MDESC_NODE_NULL;
466 
467         ep = base + from;
468 
469         ep++;
470         for (; ep->tag != MD_NODE_END; ep++) {
471                 if (ep->tag != MD_PROP_ARC)
472                         continue;
473 
474                 if (strcmp(names + ep->name_offset, arc_type))
475                         continue;
476 
477                 return ep - base;
478         }
479 
480         return MDESC_NODE_NULL;
481 }
482 EXPORT_SYMBOL(mdesc_next_arc);
483 
484 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
485 {
486         struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
487 
488         ep = base + arc;
489 
490         return ep->d.val;
491 }
492 EXPORT_SYMBOL(mdesc_arc_target);
493 
494 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
495 {
496         struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
497         const char *names = name_block(&hp->mdesc);
498         u64 last_node = hp->mdesc.node_sz / 16;
499 
500         if (node == MDESC_NODE_NULL || node >= last_node)
501                 return NULL;
502 
503         ep = base + node;
504         if (ep->tag != MD_NODE)
505                 return NULL;
506 
507         return names + ep->name_offset;
508 }
509 EXPORT_SYMBOL(mdesc_node_name);
510 
511 static u64 max_cpus = 64;
512 
513 static void __init report_platform_properties(void)
514 {
515         struct mdesc_handle *hp = mdesc_grab();
516         u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
517         const char *s;
518         const u64 *v;
519 
520         if (pn == MDESC_NODE_NULL) {
521                 prom_printf("No platform node in machine-description.\n");
522                 prom_halt();
523         }
524 
525         s = mdesc_get_property(hp, pn, "banner-name", NULL);
526         printk("PLATFORM: banner-name [%s]\n", s);
527         s = mdesc_get_property(hp, pn, "name", NULL);
528         printk("PLATFORM: name [%s]\n", s);
529 
530         v = mdesc_get_property(hp, pn, "hostid", NULL);
531         if (v)
532                 printk("PLATFORM: hostid [%08llx]\n", *v);
533         v = mdesc_get_property(hp, pn, "serial#", NULL);
534         if (v)
535                 printk("PLATFORM: serial# [%08llx]\n", *v);
536         v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
537         printk("PLATFORM: stick-frequency [%08llx]\n", *v);
538         v = mdesc_get_property(hp, pn, "mac-address", NULL);
539         if (v)
540                 printk("PLATFORM: mac-address [%llx]\n", *v);
541         v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
542         if (v)
543                 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
544         v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
545         if (v)
546                 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
547         v = mdesc_get_property(hp, pn, "max-cpus", NULL);
548         if (v) {
549                 max_cpus = *v;
550                 printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
551         }
552 
553 #ifdef CONFIG_SMP
554         {
555                 int max_cpu, i;
556 
557                 if (v) {
558                         max_cpu = *v;
559                         if (max_cpu > NR_CPUS)
560                                 max_cpu = NR_CPUS;
561                 } else {
562                         max_cpu = NR_CPUS;
563                 }
564                 for (i = 0; i < max_cpu; i++)
565                         set_cpu_possible(i, true);
566         }
567 #endif
568 
569         mdesc_release(hp);
570 }
571 
572 static void __cpuinit fill_in_one_cache(cpuinfo_sparc *c,
573                                         struct mdesc_handle *hp,
574                                         u64 mp)
575 {
576         const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
577         const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
578         const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
579         const char *type;
580         int type_len;
581 
582         type = mdesc_get_property(hp, mp, "type", &type_len);
583 
584         switch (*level) {
585         case 1:
586                 if (of_find_in_proplist(type, "instn", type_len)) {
587                         c->icache_size = *size;
588                         c->icache_line_size = *line_size;
589                 } else if (of_find_in_proplist(type, "data", type_len)) {
590                         c->dcache_size = *size;
591                         c->dcache_line_size = *line_size;
592                 }
593                 break;
594 
595         case 2:
596                 c->ecache_size = *size;
597                 c->ecache_line_size = *line_size;
598                 break;
599 
600         default:
601                 break;
602         }
603 
604         if (*level == 1) {
605                 u64 a;
606 
607                 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
608                         u64 target = mdesc_arc_target(hp, a);
609                         const char *name = mdesc_node_name(hp, target);
610 
611                         if (!strcmp(name, "cache"))
612                                 fill_in_one_cache(c, hp, target);
613                 }
614         }
615 }
616 
617 static void __cpuinit mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
618 {
619         u64 a;
620 
621         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
622                 u64 t = mdesc_arc_target(hp, a);
623                 const char *name;
624                 const u64 *id;
625 
626                 name = mdesc_node_name(hp, t);
627                 if (!strcmp(name, "cpu")) {
628                         id = mdesc_get_property(hp, t, "id", NULL);
629                         if (*id < NR_CPUS)
630                                 cpu_data(*id).core_id = core_id;
631                 } else {
632                         u64 j;
633 
634                         mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
635                                 u64 n = mdesc_arc_target(hp, j);
636                                 const char *n_name;
637 
638                                 n_name = mdesc_node_name(hp, n);
639                                 if (strcmp(n_name, "cpu"))
640                                         continue;
641 
642                                 id = mdesc_get_property(hp, n, "id", NULL);
643                                 if (*id < NR_CPUS)
644                                         cpu_data(*id).core_id = core_id;
645                         }
646                 }
647         }
648 }
649 
650 static void __cpuinit set_core_ids(struct mdesc_handle *hp)
651 {
652         int idx;
653         u64 mp;
654 
655         idx = 1;
656         mdesc_for_each_node_by_name(hp, mp, "cache") {
657                 const u64 *level;
658                 const char *type;
659                 int len;
660 
661                 level = mdesc_get_property(hp, mp, "level", NULL);
662                 if (*level != 1)
663                         continue;
664 
665                 type = mdesc_get_property(hp, mp, "type", &len);
666                 if (!of_find_in_proplist(type, "instn", len))
667                         continue;
668 
669                 mark_core_ids(hp, mp, idx);
670 
671                 idx++;
672         }
673 }
674 
675 static void __cpuinit mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
676 {
677         u64 a;
678 
679         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
680                 u64 t = mdesc_arc_target(hp, a);
681                 const char *name;
682                 const u64 *id;
683 
684                 name = mdesc_node_name(hp, t);
685                 if (strcmp(name, "cpu"))
686                         continue;
687 
688                 id = mdesc_get_property(hp, t, "id", NULL);
689                 if (*id < NR_CPUS)
690                         cpu_data(*id).proc_id = proc_id;
691         }
692 }
693 
694 static void __cpuinit __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
695 {
696         int idx;
697         u64 mp;
698 
699         idx = 0;
700         mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
701                 const char *type;
702                 int len;
703 
704                 type = mdesc_get_property(hp, mp, "type", &len);
705                 if (!of_find_in_proplist(type, "int", len) &&
706                     !of_find_in_proplist(type, "integer", len))
707                         continue;
708 
709                 mark_proc_ids(hp, mp, idx);
710 
711                 idx++;
712         }
713 }
714 
715 static void __cpuinit set_proc_ids(struct mdesc_handle *hp)
716 {
717         __set_proc_ids(hp, "exec_unit");
718         __set_proc_ids(hp, "exec-unit");
719 }
720 
721 static void __cpuinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
722                                          unsigned long def, unsigned long max)
723 {
724         u64 val;
725 
726         if (!p)
727                 goto use_default;
728         val = *p;
729 
730         if (!val || val >= 64)
731                 goto use_default;
732 
733         if (val > max)
734                 val = max;
735 
736         *mask = ((1U << val) * 64U) - 1U;
737         return;
738 
739 use_default:
740         *mask = ((1U << def) * 64U) - 1U;
741 }
742 
743 static void __cpuinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
744                                      struct trap_per_cpu *tb)
745 {
746         static int printed;
747         const u64 *val;
748 
749         val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
750         get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
751 
752         val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
753         get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
754 
755         val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
756         get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
757 
758         val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
759         get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
760         if (!printed++) {
761                 pr_info("SUN4V: Mondo queue sizes "
762                         "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
763                         tb->cpu_mondo_qmask + 1,
764                         tb->dev_mondo_qmask + 1,
765                         tb->resum_qmask + 1,
766                         tb->nonresum_qmask + 1);
767         }
768 }
769 
770 static void * __cpuinit mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
771 {
772         struct mdesc_handle *hp = mdesc_grab();
773         void *ret = NULL;
774         u64 mp;
775 
776         mdesc_for_each_node_by_name(hp, mp, "cpu") {
777                 const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
778                 int cpuid = *id;
779 
780 #ifdef CONFIG_SMP
781                 if (cpuid >= NR_CPUS) {
782                         printk(KERN_WARNING "Ignoring CPU %d which is "
783                                ">= NR_CPUS (%d)\n",
784                                cpuid, NR_CPUS);
785                         continue;
786                 }
787                 if (!cpumask_test_cpu(cpuid, mask))
788                         continue;
789 #endif
790 
791                 ret = func(hp, mp, cpuid, arg);
792                 if (ret)
793                         goto out;
794         }
795 out:
796         mdesc_release(hp);
797         return ret;
798 }
799 
800 static void * __cpuinit record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
801 {
802         ncpus_probed++;
803 #ifdef CONFIG_SMP
804         set_cpu_present(cpuid, true);
805 #endif
806         return NULL;
807 }
808 
809 void __cpuinit mdesc_populate_present_mask(cpumask_t *mask)
810 {
811         if (tlb_type != hypervisor)
812                 return;
813 
814         ncpus_probed = 0;
815         mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
816 }
817 
818 static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
819 {
820         const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
821         struct trap_per_cpu *tb;
822         cpuinfo_sparc *c;
823         u64 a;
824 
825 #ifndef CONFIG_SMP
826         /* On uniprocessor we only want the values for the
827          * real physical cpu the kernel booted onto, however
828          * cpu_data() only has one entry at index 0.
829          */
830         if (cpuid != real_hard_smp_processor_id())
831                 return NULL;
832         cpuid = 0;
833 #endif
834 
835         c = &cpu_data(cpuid);
836         c->clock_tick = *cfreq;
837 
838         tb = &trap_block[cpuid];
839         get_mondo_data(hp, mp, tb);
840 
841         mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
842                 u64 j, t = mdesc_arc_target(hp, a);
843                 const char *t_name;
844 
845                 t_name = mdesc_node_name(hp, t);
846                 if (!strcmp(t_name, "cache")) {
847                         fill_in_one_cache(c, hp, t);
848                         continue;
849                 }
850 
851                 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
852                         u64 n = mdesc_arc_target(hp, j);
853                         const char *n_name;
854 
855                         n_name = mdesc_node_name(hp, n);
856                         if (!strcmp(n_name, "cache"))
857                                 fill_in_one_cache(c, hp, n);
858                 }
859         }
860 
861         c->core_id = 0;
862         c->proc_id = -1;
863 
864         return NULL;
865 }
866 
867 void __cpuinit mdesc_fill_in_cpu_data(cpumask_t *mask)
868 {
869         struct mdesc_handle *hp;
870 
871         mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
872 
873 #ifdef CONFIG_SMP
874         sparc64_multi_core = 1;
875 #endif
876 
877         hp = mdesc_grab();
878 
879         set_core_ids(hp);
880         set_proc_ids(hp);
881 
882         mdesc_release(hp);
883 
884         smp_fill_in_sib_core_maps();
885 }
886 
887 static ssize_t mdesc_read(struct file *file, char __user *buf,
888                           size_t len, loff_t *offp)
889 {
890         struct mdesc_handle *hp = mdesc_grab();
891         int err;
892 
893         if (!hp)
894                 return -ENODEV;
895 
896         err = hp->handle_size;
897         if (len < hp->handle_size)
898                 err = -EMSGSIZE;
899         else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
900                 err = -EFAULT;
901         mdesc_release(hp);
902 
903         return err;
904 }
905 
906 static const struct file_operations mdesc_fops = {
907         .read   = mdesc_read,
908         .owner  = THIS_MODULE,
909         .llseek = noop_llseek,
910 };
911 
912 static struct miscdevice mdesc_misc = {
913         .minor  = MISC_DYNAMIC_MINOR,
914         .name   = "mdesc",
915         .fops   = &mdesc_fops,
916 };
917 
918 static int __init mdesc_misc_init(void)
919 {
920         return misc_register(&mdesc_misc);
921 }
922 
923 __initcall(mdesc_misc_init);
924 
925 void __init sun4v_mdesc_init(void)
926 {
927         struct mdesc_handle *hp;
928         unsigned long len, real_len, status;
929 
930         (void) sun4v_mach_desc(0UL, 0UL, &len);
931 
932         printk("MDESC: Size is %lu bytes.\n", len);
933 
934         hp = mdesc_alloc(len, &memblock_mdesc_ops);
935         if (hp == NULL) {
936                 prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
937                 prom_halt();
938         }
939 
940         status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
941         if (status != HV_EOK || real_len > len) {
942                 prom_printf("sun4v_mach_desc fails, err(%lu), "
943                             "len(%lu), real_len(%lu)\n",
944                             status, len, real_len);
945                 mdesc_free(hp);
946                 prom_halt();
947         }
948 
949         cur_mdesc = hp;
950 
951         report_platform_properties();
952 }
953 

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