arch/sparc/kernel/mdesc.c

   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 }