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#include <linux/export.h>
  15
  16#include <asm/cpudata.h>
  17#include <asm/hypervisor.h>
  18#include <asm/mdesc.h>
  19#include <asm/prom.h>
  20#include <linux/uaccess.h>
  21#include <asm/oplib.h>
  22#include <asm/smp.h>
  23
  24/* Unlike the OBP device tree, the machine description is a full-on
  25 * DAG.  An arbitrary number of ARCs are possible from one
  26 * node to other nodes and thus we can't use the OBP device_node
  27 * data structure to represent these nodes inside of the kernel.
  28 *
  29 * Actually, it isn't even a DAG, because there are back pointers
  30 * which create cycles in the graph.
  31 *
  32 * mdesc_hdr and mdesc_elem describe the layout of the data structure
  33 * we get from the Hypervisor.
  34 */
  35struct mdesc_hdr {
  36        u32     version; /* Transport version */
  37        u32     node_sz; /* node block size */
  38        u32     name_sz; /* name block size */
  39        u32     data_sz; /* data block size */
  40} __attribute__((aligned(16)));
  41
  42struct mdesc_elem {
  43        u8      tag;
  44#define MD_LIST_END     0x00
  45#define MD_NODE         0x4e
  46#define MD_NODE_END     0x45
  47#define MD_NOOP         0x20
  48#define MD_PROP_ARC     0x61
  49#define MD_PROP_VAL     0x76
  50#define MD_PROP_STR     0x73
  51#define MD_PROP_DATA    0x64
  52        u8      name_len;
  53        u16     resv;
  54        u32     name_offset;
  55        union {
  56                struct {
  57                        u32     data_len;
  58                        u32     data_offset;
  59                } data;
  60                u64     val;
  61        } d;
  62};
  63
  64struct mdesc_mem_ops {
  65        struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
  66        void (*free)(struct mdesc_handle *handle);
  67};
  68
  69struct mdesc_handle {
  70        struct list_head        list;
  71        struct mdesc_mem_ops    *mops;
  72        void                    *self_base;
  73        atomic_t                refcnt;
  74        unsigned int            handle_size;
  75        struct mdesc_hdr        mdesc;
  76};
  77
  78static void mdesc_handle_init(struct mdesc_handle *hp,
  79                              unsigned int handle_size,
  80                              void *base)
  81{
  82        BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
  83
  84        memset(hp, 0, handle_size);
  85        INIT_LIST_HEAD(&hp->list);
  86        hp->self_base = base;
  87        atomic_set(&hp->refcnt, 1);
  88        hp->handle_size = handle_size;
  89}
  90
  91static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size)
  92{
  93        unsigned int handle_size, alloc_size;
  94        struct mdesc_handle *hp;
  95        unsigned long paddr;
  96
  97        handle_size = (sizeof(struct mdesc_handle) -
  98                       sizeof(struct mdesc_hdr) +
  99                       mdesc_size);
 100        alloc_size = PAGE_ALIGN(handle_size);
 101
 102        paddr = memblock_alloc(alloc_size, PAGE_SIZE);
 103
 104        hp = NULL;
 105        if (paddr) {
 106                hp = __va(paddr);
 107                mdesc_handle_init(hp, handle_size, hp);
 108        }
 109        return hp;
 110}
 111
 112static void __init mdesc_memblock_free(struct mdesc_handle *hp)
 113{
 114        unsigned int alloc_size;
 115        unsigned long start;
 116
 117        BUG_ON(atomic_read(&hp->refcnt) != 0);
 118        BUG_ON(!list_empty(&hp->list));
 119
 120        alloc_size = PAGE_ALIGN(hp->handle_size);
 121        start = __pa(hp);
 122        free_bootmem_late(start, alloc_size);
 123}
 124
 125static struct mdesc_mem_ops memblock_mdesc_ops = {
 126        .alloc = mdesc_memblock_alloc,
 127        .free  = mdesc_memblock_free,
 128};
 129
 130static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
 131{
 132        unsigned int handle_size;
 133        struct mdesc_handle *hp;
 134        unsigned long addr;
 135        void *base;
 136
 137        handle_size = (sizeof(struct mdesc_handle) -
 138                       sizeof(struct mdesc_hdr) +
 139                       mdesc_size);
 140
 141        /*
 142         * Allocation has to succeed because mdesc update would be missed
 143         * and such events are not retransmitted.
 144         */
 145        base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
 146        addr = (unsigned long)base;
 147        addr = (addr + 15UL) & ~15UL;
 148        hp = (struct mdesc_handle *) addr;
 149
 150        mdesc_handle_init(hp, handle_size, base);
 151
 152        return hp;
 153}
 154
 155static void mdesc_kfree(struct mdesc_handle *hp)
 156{
 157        BUG_ON(atomic_read(&hp->refcnt) != 0);
 158        BUG_ON(!list_empty(&hp->list));
 159
 160        kfree(hp->self_base);
 161}
 162
 163static struct mdesc_mem_ops kmalloc_mdesc_memops = {
 164        .alloc = mdesc_kmalloc,
 165        .free  = mdesc_kfree,
 166};
 167
 168static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
 169                                        struct mdesc_mem_ops *mops)
 170{
 171        struct mdesc_handle *hp = mops->alloc(mdesc_size);
 172
 173        if (hp)
 174                hp->mops = mops;
 175
 176        return hp;
 177}
 178
 179static void mdesc_free(struct mdesc_handle *hp)
 180{
 181        hp->mops->free(hp);
 182}
 183
 184static struct mdesc_handle *cur_mdesc;
 185static LIST_HEAD(mdesc_zombie_list);
 186static DEFINE_SPINLOCK(mdesc_lock);
 187
 188struct mdesc_handle *mdesc_grab(void)
 189{
 190        struct mdesc_handle *hp;
 191        unsigned long flags;
 192
 193        spin_lock_irqsave(&mdesc_lock, flags);
 194        hp = cur_mdesc;
 195        if (hp)
 196                atomic_inc(&hp->refcnt);
 197        spin_unlock_irqrestore(&mdesc_lock, flags);
 198
 199        return hp;
 200}
 201EXPORT_SYMBOL(mdesc_grab);
 202
 203void mdesc_release(struct mdesc_handle *hp)
 204{
 205        unsigned long flags;
 206
 207        spin_lock_irqsave(&mdesc_lock, flags);
 208        if (atomic_dec_and_test(&hp->refcnt)) {
 209                list_del_init(&hp->list);
 210                hp->mops->free(hp);
 211        }
 212        spin_unlock_irqrestore(&mdesc_lock, flags);
 213}
 214EXPORT_SYMBOL(mdesc_release);
 215
 216static DEFINE_MUTEX(mdesc_mutex);
 217static struct mdesc_notifier_client *client_list;
 218
 219void mdesc_register_notifier(struct mdesc_notifier_client *client)
 220{
 221        u64 node;
 222
 223        mutex_lock(&mdesc_mutex);
 224        client->next = client_list;
 225        client_list = client;
 226
 227        mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
 228                client->add(cur_mdesc, node);
 229
 230        mutex_unlock(&mdesc_mutex);
 231}
 232
 233static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
 234{
 235        const u64 *id;
 236        u64 a;
 237
 238        id = NULL;
 239        mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
 240                u64 target;
 241
 242                target = mdesc_arc_target(hp, a);
 243                id = mdesc_get_property(hp, target,
 244                                        "cfg-handle", NULL);
 245                if (id)
 246                        break;
 247        }
 248
 249        return id;
 250}
 251
 252/* Run 'func' on nodes which are in A but not in B.  */
 253static void invoke_on_missing(const char *name,
 254                              struct mdesc_handle *a,
 255                              struct mdesc_handle *b,
 256                              void (*func)(struct mdesc_handle *, u64))
 257{
 258        u64 node;
 259
 260        mdesc_for_each_node_by_name(a, node, name) {
 261                int found = 0, is_vdc_port = 0;
 262                const char *name_prop;
 263                const u64 *id;
 264                u64 fnode;
 265
 266                name_prop = mdesc_get_property(a, node, "name", NULL);
 267                if (name_prop && !strcmp(name_prop, "vdc-port")) {
 268                        is_vdc_port = 1;
 269                        id = parent_cfg_handle(a, node);
 270                } else
 271                        id = mdesc_get_property(a, node, "id", NULL);
 272
 273                if (!id) {
 274                        printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
 275                               (name_prop ? name_prop : name));
 276                        continue;
 277                }
 278
 279                mdesc_for_each_node_by_name(b, fnode, name) {
 280                        const u64 *fid;
 281
 282                        if (is_vdc_port) {
 283                                name_prop = mdesc_get_property(b, fnode,
 284                                                               "name", NULL);
 285                                if (!name_prop ||
 286                                    strcmp(name_prop, "vdc-port"))
 287                                        continue;
 288                                fid = parent_cfg_handle(b, fnode);
 289                                if (!fid) {
 290                                        printk(KERN_ERR "MD: Cannot find ID "
 291                                               "for vdc-port node.\n");
 292                                        continue;
 293                                }
 294                        } else
 295                                fid = mdesc_get_property(b, fnode,
 296                                                         "id", NULL);
 297
 298                        if (*id == *fid) {
 299                                found = 1;
 300                                break;
 301                        }
 302                }
 303                if (!found)
 304                        func(a, node);
 305        }
 306}
 307
 308static void notify_one(struct mdesc_notifier_client *p,
 309                       struct mdesc_handle *old_hp,
 310                       struct mdesc_handle *new_hp)
 311{
 312        invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
 313        invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
 314}
 315
 316static void mdesc_notify_clients(struct mdesc_handle *old_hp,
 317                                 struct mdesc_handle *new_hp)
 318{
 319        struct mdesc_notifier_client *p = client_list;
 320
 321        while (p) {
 322                notify_one(p, old_hp, new_hp);
 323                p = p->next;
 324        }
 325}
 326
 327void mdesc_update(void)
 328{
 329        unsigned long len, real_len, status;
 330        struct mdesc_handle *hp, *orig_hp;
 331        unsigned long flags;
 332
 333        mutex_lock(&mdesc_mutex);
 334
 335        (void) sun4v_mach_desc(0UL, 0UL, &len);
 336
 337        hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
 338        if (!hp) {
 339                printk(KERN_ERR "MD: mdesc alloc fails\n");
 340                goto out;
 341        }
 342
 343        status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
 344        if (status != HV_EOK || real_len > len) {
 345                printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
 346                       status);
 347                atomic_dec(&hp->refcnt);
 348                mdesc_free(hp);
 349                goto out;
 350        }
 351
 352        spin_lock_irqsave(&mdesc_lock, flags);
 353        orig_hp = cur_mdesc;
 354        cur_mdesc = hp;
 355        spin_unlock_irqrestore(&mdesc_lock, flags);
 356
 357        mdesc_notify_clients(orig_hp, hp);
 358
 359        spin_lock_irqsave(&mdesc_lock, flags);
 360        if (atomic_dec_and_test(&orig_hp->refcnt))
 361                mdesc_free(orig_hp);
 362        else
 363                list_add(&orig_hp->list, &mdesc_zombie_list);
 364        spin_unlock_irqrestore(&mdesc_lock, flags);
 365
 366out:
 367        mutex_unlock(&mdesc_mutex);
 368}
 369
 370static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
 371{
 372        return (struct mdesc_elem *) (mdesc + 1);
 373}
 374
 375static void *name_block(struct mdesc_hdr *mdesc)
 376{
 377        return ((void *) node_block(mdesc)) + mdesc->node_sz;
 378}
 379
 380static void *data_block(struct mdesc_hdr *mdesc)
 381{
 382        return ((void *) name_block(mdesc)) + mdesc->name_sz;
 383}
 384
 385u64 mdesc_node_by_name(struct mdesc_handle *hp,
 386                       u64 from_node, const char *name)
 387{
 388        struct mdesc_elem *ep = node_block(&hp->mdesc);
 389        const char *names = name_block(&hp->mdesc);
 390        u64 last_node = hp->mdesc.node_sz / 16;
 391        u64 ret;
 392
 393        if (from_node == MDESC_NODE_NULL) {
 394                ret = from_node = 0;
 395        } else if (from_node >= last_node) {
 396                return MDESC_NODE_NULL;
 397        } else {
 398                ret = ep[from_node].d.val;
 399        }
 400
 401        while (ret < last_node) {
 402                if (ep[ret].tag != MD_NODE)
 403                        return MDESC_NODE_NULL;
 404                if (!strcmp(names + ep[ret].name_offset, name))
 405                        break;
 406                ret = ep[ret].d.val;
 407        }
 408        if (ret >= last_node)
 409                ret = MDESC_NODE_NULL;
 410        return ret;
 411}
 412EXPORT_SYMBOL(mdesc_node_by_name);
 413
 414const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
 415                               const char *name, int *lenp)
 416{
 417        const char *names = name_block(&hp->mdesc);
 418        u64 last_node = hp->mdesc.node_sz / 16;
 419        void *data = data_block(&hp->mdesc);
 420        struct mdesc_elem *ep;
 421
 422        if (node == MDESC_NODE_NULL || node >= last_node)
 423                return NULL;
 424
 425        ep = node_block(&hp->mdesc) + node;
 426        ep++;
 427        for (; ep->tag != MD_NODE_END; ep++) {
 428                void *val = NULL;
 429                int len = 0;
 430
 431                switch (ep->tag) {
 432                case MD_PROP_VAL:
 433                        val = &ep->d.val;
 434                        len = 8;
 435                        break;
 436
 437                case MD_PROP_STR:
 438                case MD_PROP_DATA:
 439                        val = data + ep->d.data.data_offset;
 440                        len = ep->d.data.data_len;
 441                        break;
 442
 443                default:
 444                        break;
 445                }
 446                if (!val)
 447                        continue;
 448
 449                if (!strcmp(names + ep->name_offset, name)) {
 450                        if (lenp)
 451                                *lenp = len;
 452                        return val;
 453                }
 454        }
 455
 456        return NULL;
 457}
 458EXPORT_SYMBOL(mdesc_get_property);
 459
 460u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
 461{
 462        struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
 463        const char *names = name_block(&hp->mdesc);
 464        u64 last_node = hp->mdesc.node_sz / 16;
 465
 466        if (from == MDESC_NODE_NULL || from >= last_node)
 467                return MDESC_NODE_NULL;
 468
 469        ep = base + from;
 470
 471        ep++;
 472        for (; ep->tag != MD_NODE_END; ep++) {
 473                if (ep->tag != MD_PROP_ARC)
 474                        continue;
 475
 476                if (strcmp(names + ep->name_offset, arc_type))
 477                        continue;
 478
 479                return ep - base;
 480        }
 481
 482        return MDESC_NODE_NULL;
 483}
 484EXPORT_SYMBOL(mdesc_next_arc);
 485
 486u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
 487{
 488        struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
 489
 490        ep = base + arc;
 491
 492        return ep->d.val;
 493}
 494EXPORT_SYMBOL(mdesc_arc_target);
 495
 496const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
 497{
 498        struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
 499        const char *names = name_block(&hp->mdesc);
 500        u64 last_node = hp->mdesc.node_sz / 16;
 501
 502        if (node == MDESC_NODE_NULL || node >= last_node)
 503                return NULL;
 504
 505        ep = base + node;
 506        if (ep->tag != MD_NODE)
 507                return NULL;
 508
 509        return names + ep->name_offset;
 510}
 511EXPORT_SYMBOL(mdesc_node_name);
 512
 513static u64 max_cpus = 64;
 514
 515static void __init report_platform_properties(void)
 516{
 517        struct mdesc_handle *hp = mdesc_grab();
 518        u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
 519        const char *s;
 520        const u64 *v;
 521
 522        if (pn == MDESC_NODE_NULL) {
 523                prom_printf("No platform node in machine-description.\n");
 524                prom_halt();
 525        }
 526
 527        s = mdesc_get_property(hp, pn, "banner-name", NULL);
 528        printk("PLATFORM: banner-name [%s]\n", s);
 529        s = mdesc_get_property(hp, pn, "name", NULL);
 530        printk("PLATFORM: name [%s]\n", s);
 531
 532        v = mdesc_get_property(hp, pn, "hostid", NULL);
 533        if (v)
 534                printk("PLATFORM: hostid [%08llx]\n", *v);
 535        v = mdesc_get_property(hp, pn, "serial#", NULL);
 536        if (v)
 537                printk("PLATFORM: serial# [%08llx]\n", *v);
 538        v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
 539        printk("PLATFORM: stick-frequency [%08llx]\n", *v);
 540        v = mdesc_get_property(hp, pn, "mac-address", NULL);
 541        if (v)
 542                printk("PLATFORM: mac-address [%llx]\n", *v);
 543        v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
 544        if (v)
 545                printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
 546        v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
 547        if (v)
 548                printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
 549        v = mdesc_get_property(hp, pn, "max-cpus", NULL);
 550        if (v) {
 551                max_cpus = *v;
 552                printk("PLATFORM: max-cpus [%llu]\n", max_cpus);
 553        }
 554
 555#ifdef CONFIG_SMP
 556        {
 557                int max_cpu, i;
 558
 559                if (v) {
 560                        max_cpu = *v;
 561                        if (max_cpu > NR_CPUS)
 562                                max_cpu = NR_CPUS;
 563                } else {
 564                        max_cpu = NR_CPUS;
 565                }
 566                for (i = 0; i < max_cpu; i++)
 567                        set_cpu_possible(i, true);
 568        }
 569#endif
 570
 571        mdesc_release(hp);
 572}
 573
 574static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, 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
 617static void find_back_node_value(struct mdesc_handle *hp, u64 node,
 618                                 char *srch_val,
 619                                 void (*func)(struct mdesc_handle *, u64, int),
 620                                 u64 val, int depth)
 621{
 622        u64 arc;
 623
 624        /* Since we have an estimate of recursion depth, do a sanity check. */
 625        if (depth == 0)
 626                return;
 627
 628        mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) {
 629                u64 n = mdesc_arc_target(hp, arc);
 630                const char *name = mdesc_node_name(hp, n);
 631
 632                if (!strcmp(srch_val, name))
 633                        (*func)(hp, n, val);
 634
 635                find_back_node_value(hp, n, srch_val, func, val, depth-1);
 636        }
 637}
 638
 639static void __mark_core_id(struct mdesc_handle *hp, u64 node,
 640                           int core_id)
 641{
 642        const u64 *id = mdesc_get_property(hp, node, "id", NULL);
 643
 644        if (*id < num_possible_cpus())
 645                cpu_data(*id).core_id = core_id;
 646}
 647
 648static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node,
 649                                int max_cache_id)
 650{
 651        const u64 *id = mdesc_get_property(hp, node, "id", NULL);
 652
 653        if (*id < num_possible_cpus()) {
 654                cpu_data(*id).max_cache_id = max_cache_id;
 655
 656                /**
 657                 * On systems without explicit socket descriptions socket
 658                 * is max_cache_id
 659                 */
 660                cpu_data(*id).sock_id = max_cache_id;
 661        }
 662}
 663
 664static void mark_core_ids(struct mdesc_handle *hp, u64 mp,
 665                          int core_id)
 666{
 667        find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10);
 668}
 669
 670static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp,
 671                               int max_cache_id)
 672{
 673        find_back_node_value(hp, mp, "cpu", __mark_max_cache_id,
 674                             max_cache_id, 10);
 675}
 676
 677static void set_core_ids(struct mdesc_handle *hp)
 678{
 679        int idx;
 680        u64 mp;
 681
 682        idx = 1;
 683
 684        /* Identify unique cores by looking for cpus backpointed to by
 685         * level 1 instruction caches.
 686         */
 687        mdesc_for_each_node_by_name(hp, mp, "cache") {
 688                const u64 *level;
 689                const char *type;
 690                int len;
 691
 692                level = mdesc_get_property(hp, mp, "level", NULL);
 693                if (*level != 1)
 694                        continue;
 695
 696                type = mdesc_get_property(hp, mp, "type", &len);
 697                if (!of_find_in_proplist(type, "instn", len))
 698                        continue;
 699
 700                mark_core_ids(hp, mp, idx);
 701                idx++;
 702        }
 703}
 704
 705static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level)
 706{
 707        u64 mp;
 708        int idx = 1;
 709        int fnd = 0;
 710
 711        /**
 712         * Identify unique highest level of shared cache by looking for cpus
 713         * backpointed to by shared level N caches.
 714         */
 715        mdesc_for_each_node_by_name(hp, mp, "cache") {
 716                const u64 *cur_lvl;
 717
 718                cur_lvl = mdesc_get_property(hp, mp, "level", NULL);
 719                if (*cur_lvl != level)
 720                        continue;
 721                mark_max_cache_ids(hp, mp, idx);
 722                idx++;
 723                fnd = 1;
 724        }
 725        return fnd;
 726}
 727
 728static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp)
 729{
 730        int idx = 1;
 731
 732        mdesc_for_each_node_by_name(hp, mp, "socket") {
 733                u64 a;
 734
 735                mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
 736                        u64 t = mdesc_arc_target(hp, a);
 737                        const char *name;
 738                        const u64 *id;
 739
 740                        name = mdesc_node_name(hp, t);
 741                        if (strcmp(name, "cpu"))
 742                                continue;
 743
 744                        id = mdesc_get_property(hp, t, "id", NULL);
 745                        if (*id < num_possible_cpus())
 746                                cpu_data(*id).sock_id = idx;
 747                }
 748                idx++;
 749        }
 750}
 751
 752static void set_sock_ids(struct mdesc_handle *hp)
 753{
 754        u64 mp;
 755
 756        /**
 757         * Find the highest level of shared cache which pre-T7 is also
 758         * the socket.
 759         */
 760        if (!set_max_cache_ids_by_cache(hp, 3))
 761                set_max_cache_ids_by_cache(hp, 2);
 762
 763        /* If machine description exposes sockets data use it.*/
 764        mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets");
 765        if (mp != MDESC_NODE_NULL)
 766                set_sock_ids_by_socket(hp, mp);
 767}
 768
 769static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
 770{
 771        u64 a;
 772
 773        mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
 774                u64 t = mdesc_arc_target(hp, a);
 775                const char *name;
 776                const u64 *id;
 777
 778                name = mdesc_node_name(hp, t);
 779                if (strcmp(name, "cpu"))
 780                        continue;
 781
 782                id = mdesc_get_property(hp, t, "id", NULL);
 783                if (*id < NR_CPUS)
 784                        cpu_data(*id).proc_id = proc_id;
 785        }
 786}
 787
 788static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
 789{
 790        int idx;
 791        u64 mp;
 792
 793        idx = 0;
 794        mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
 795                const char *type;
 796                int len;
 797
 798                type = mdesc_get_property(hp, mp, "type", &len);
 799                if (!of_find_in_proplist(type, "int", len) &&
 800                    !of_find_in_proplist(type, "integer", len))
 801                        continue;
 802
 803                mark_proc_ids(hp, mp, idx);
 804                idx++;
 805        }
 806}
 807
 808static void set_proc_ids(struct mdesc_handle *hp)
 809{
 810        __set_proc_ids(hp, "exec_unit");
 811        __set_proc_ids(hp, "exec-unit");
 812}
 813
 814static void get_one_mondo_bits(const u64 *p, unsigned int *mask,
 815                               unsigned long def, unsigned long max)
 816{
 817        u64 val;
 818
 819        if (!p)
 820                goto use_default;
 821        val = *p;
 822
 823        if (!val || val >= 64)
 824                goto use_default;
 825
 826        if (val > max)
 827                val = max;
 828
 829        *mask = ((1U << val) * 64U) - 1U;
 830        return;
 831
 832use_default:
 833        *mask = ((1U << def) * 64U) - 1U;
 834}
 835
 836static void get_mondo_data(struct mdesc_handle *hp, u64 mp,
 837                           struct trap_per_cpu *tb)
 838{
 839        static int printed;
 840        const u64 *val;
 841
 842        val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
 843        get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2));
 844
 845        val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
 846        get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8);
 847
 848        val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
 849        get_one_mondo_bits(val, &tb->resum_qmask, 6, 7);
 850
 851        val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
 852        get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2);
 853        if (!printed++) {
 854                pr_info("SUN4V: Mondo queue sizes "
 855                        "[cpu(%u) dev(%u) r(%u) nr(%u)]\n",
 856                        tb->cpu_mondo_qmask + 1,
 857                        tb->dev_mondo_qmask + 1,
 858                        tb->resum_qmask + 1,
 859                        tb->nonresum_qmask + 1);
 860        }
 861}
 862
 863static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
 864{
 865        struct mdesc_handle *hp = mdesc_grab();
 866        void *ret = NULL;
 867        u64 mp;
 868
 869        mdesc_for_each_node_by_name(hp, mp, "cpu") {
 870                const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
 871                int cpuid = *id;
 872
 873#ifdef CONFIG_SMP
 874                if (cpuid >= NR_CPUS) {
 875                        printk(KERN_WARNING "Ignoring CPU %d which is "
 876                               ">= NR_CPUS (%d)\n",
 877                               cpuid, NR_CPUS);
 878                        continue;
 879                }
 880                if (!cpumask_test_cpu(cpuid, mask))
 881                        continue;
 882#endif
 883
 884                ret = func(hp, mp, cpuid, arg);
 885                if (ret)
 886                        goto out;
 887        }
 888out:
 889        mdesc_release(hp);
 890        return ret;
 891}
 892
 893static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
 894                            void *arg)
 895{
 896        ncpus_probed++;
 897#ifdef CONFIG_SMP
 898        set_cpu_present(cpuid, true);
 899#endif
 900        return NULL;
 901}
 902
 903void mdesc_populate_present_mask(cpumask_t *mask)
 904{
 905        if (tlb_type != hypervisor)
 906                return;
 907
 908        ncpus_probed = 0;
 909        mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
 910}
 911
 912static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
 913{
 914        const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL);
 915        unsigned long *pgsz_mask = arg;
 916        u64 val;
 917
 918        val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K |
 919               HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB);
 920        if (pgsz_prop)
 921                val = *pgsz_prop;
 922
 923        if (!*pgsz_mask)
 924                *pgsz_mask = val;
 925        else
 926                *pgsz_mask &= val;
 927        return NULL;
 928}
 929
 930void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask)
 931{
 932        *pgsz_mask = 0;
 933        mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask);
 934}
 935
 936static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid,
 937                             void *arg)
 938{
 939        const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
 940        struct trap_per_cpu *tb;
 941        cpuinfo_sparc *c;
 942        u64 a;
 943
 944#ifndef CONFIG_SMP
 945        /* On uniprocessor we only want the values for the
 946         * real physical cpu the kernel booted onto, however
 947         * cpu_data() only has one entry at index 0.
 948         */
 949        if (cpuid != real_hard_smp_processor_id())
 950                return NULL;
 951        cpuid = 0;
 952#endif
 953
 954        c = &cpu_data(cpuid);
 955        c->clock_tick = *cfreq;
 956
 957        tb = &trap_block[cpuid];
 958        get_mondo_data(hp, mp, tb);
 959
 960        mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
 961                u64 j, t = mdesc_arc_target(hp, a);
 962                const char *t_name;
 963
 964                t_name = mdesc_node_name(hp, t);
 965                if (!strcmp(t_name, "cache")) {
 966                        fill_in_one_cache(c, hp, t);
 967                        continue;
 968                }
 969
 970                mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
 971                        u64 n = mdesc_arc_target(hp, j);
 972                        const char *n_name;
 973
 974                        n_name = mdesc_node_name(hp, n);
 975                        if (!strcmp(n_name, "cache"))
 976                                fill_in_one_cache(c, hp, n);
 977                }
 978        }
 979
 980        c->core_id = 0;
 981        c->proc_id = -1;
 982
 983        return NULL;
 984}
 985
 986void mdesc_fill_in_cpu_data(cpumask_t *mask)
 987{
 988        struct mdesc_handle *hp;
 989
 990        mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
 991
 992        hp = mdesc_grab();
 993
 994        set_core_ids(hp);
 995        set_proc_ids(hp);
 996        set_sock_ids(hp);
 997
 998        mdesc_release(hp);
 999
1000        smp_fill_in_sib_core_maps();
1001}
1002
1003/* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is
1004 * opened. Hold this reference until /dev/mdesc is closed to ensure
1005 * mdesc data structure is not released underneath us. Store the
1006 * pointer to mdesc structure in private_data for read and seek to use
1007 */
1008static int mdesc_open(struct inode *inode, struct file *file)
1009{
1010        struct mdesc_handle *hp = mdesc_grab();
1011
1012        if (!hp)
1013                return -ENODEV;
1014
1015        file->private_data = hp;
1016
1017        return 0;
1018}
1019
1020static ssize_t mdesc_read(struct file *file, char __user *buf,
1021                          size_t len, loff_t *offp)
1022{
1023        struct mdesc_handle *hp = file->private_data;
1024        unsigned char *mdesc;
1025        int bytes_left, count = len;
1026
1027        if (*offp >= hp->handle_size)
1028                return 0;
1029
1030        bytes_left = hp->handle_size - *offp;
1031        if (count > bytes_left)
1032                count = bytes_left;
1033
1034        mdesc = (unsigned char *)&hp->mdesc;
1035        mdesc += *offp;
1036        if (!copy_to_user(buf, mdesc, count)) {
1037                *offp += count;
1038                return count;
1039        } else {
1040                return -EFAULT;
1041        }
1042}
1043
1044static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence)
1045{
1046        struct mdesc_handle *hp = file->private_data;
1047
1048        return no_seek_end_llseek_size(file, offset, whence, hp->handle_size);
1049}
1050
1051/* mdesc_close() - /dev/mdesc is being closed, release the reference to
1052 * mdesc structure.
1053 */
1054static int mdesc_close(struct inode *inode, struct file *file)
1055{
1056        mdesc_release(file->private_data);
1057        return 0;
1058}
1059
1060static const struct file_operations mdesc_fops = {
1061        .open    = mdesc_open,
1062        .read    = mdesc_read,
1063        .llseek  = mdesc_llseek,
1064        .release = mdesc_close,
1065        .owner   = THIS_MODULE,
1066};
1067
1068static struct miscdevice mdesc_misc = {
1069        .minor  = MISC_DYNAMIC_MINOR,
1070        .name   = "mdesc",
1071        .fops   = &mdesc_fops,
1072};
1073
1074static int __init mdesc_misc_init(void)
1075{
1076        return misc_register(&mdesc_misc);
1077}
1078
1079__initcall(mdesc_misc_init);
1080
1081void __init sun4v_mdesc_init(void)
1082{
1083        struct mdesc_handle *hp;
1084        unsigned long len, real_len, status;
1085
1086        (void) sun4v_mach_desc(0UL, 0UL, &len);
1087
1088        printk("MDESC: Size is %lu bytes.\n", len);
1089
1090        hp = mdesc_alloc(len, &memblock_mdesc_ops);
1091        if (hp == NULL) {
1092                prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
1093                prom_halt();
1094        }
1095
1096        status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
1097        if (status != HV_EOK || real_len > len) {
1098                prom_printf("sun4v_mach_desc fails, err(%lu), "
1099                            "len(%lu), real_len(%lu)\n",
1100                            status, len, real_len);
1101                mdesc_free(hp);
1102                prom_halt();
1103        }
1104
1105        cur_mdesc = hp;
1106
1107        report_platform_properties();
1108}
1109