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/lmb.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_lmb_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 = lmb_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 mdesc_lmb_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 lmb_mdesc_ops = { 124 .alloc = mdesc_lmb_alloc, 125 .free = mdesc_lmb_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 void __init report_platform_properties(void) 512 { 513 struct mdesc_handle *hp = mdesc_grab(); 514 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); 515 const char *s; 516 const u64 *v; 517 518 if (pn == MDESC_NODE_NULL) { 519 prom_printf("No platform node in machine-description.\n"); 520 prom_halt(); 521 } 522 523 s = mdesc_get_property(hp, pn, "banner-name", NULL); 524 printk("PLATFORM: banner-name [%s]\n", s); 525 s = mdesc_get_property(hp, pn, "name", NULL); 526 printk("PLATFORM: name [%s]\n", s); 527 528 v = mdesc_get_property(hp, pn, "hostid", NULL); 529 if (v) 530 printk("PLATFORM: hostid [%08llx]\n", *v); 531 v = mdesc_get_property(hp, pn, "serial#", NULL); 532 if (v) 533 printk("PLATFORM: serial# [%08llx]\n", *v); 534 v = mdesc_get_property(hp, pn, "stick-frequency", NULL); 535 printk("PLATFORM: stick-frequency [%08llx]\n", *v); 536 v = mdesc_get_property(hp, pn, "mac-address", NULL); 537 if (v) 538 printk("PLATFORM: mac-address [%llx]\n", *v); 539 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL); 540 if (v) 541 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v); 542 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL); 543 if (v) 544 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v); 545 v = mdesc_get_property(hp, pn, "max-cpus", NULL); 546 if (v) 547 printk("PLATFORM: max-cpus [%llu]\n", *v); 548 549 #ifdef CONFIG_SMP 550 { 551 int max_cpu, i; 552 553 if (v) { 554 max_cpu = *v; 555 if (max_cpu > NR_CPUS) 556 max_cpu = NR_CPUS; 557 } else { 558 max_cpu = NR_CPUS; 559 } 560 for (i = 0; i < max_cpu; i++) 561 set_cpu_possible(i, true); 562 } 563 #endif 564 565 mdesc_release(hp); 566 } 567 568 static void __cpuinit fill_in_one_cache(cpuinfo_sparc *c, 569 struct mdesc_handle *hp, 570 u64 mp) 571 { 572 const u64 *level = mdesc_get_property(hp, mp, "level", NULL); 573 const u64 *size = mdesc_get_property(hp, mp, "size", NULL); 574 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL); 575 const char *type; 576 int type_len; 577 578 type = mdesc_get_property(hp, mp, "type", &type_len); 579 580 switch (*level) { 581 case 1: 582 if (of_find_in_proplist(type, "instn", type_len)) { 583 c->icache_size = *size; 584 c->icache_line_size = *line_size; 585 } else if (of_find_in_proplist(type, "data", type_len)) { 586 c->dcache_size = *size; 587 c->dcache_line_size = *line_size; 588 } 589 break; 590 591 case 2: 592 c->ecache_size = *size; 593 c->ecache_line_size = *line_size; 594 break; 595 596 default: 597 break; 598 } 599 600 if (*level == 1) { 601 u64 a; 602 603 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 604 u64 target = mdesc_arc_target(hp, a); 605 const char *name = mdesc_node_name(hp, target); 606 607 if (!strcmp(name, "cache")) 608 fill_in_one_cache(c, hp, target); 609 } 610 } 611 } 612 613 static void __cpuinit mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id) 614 { 615 u64 a; 616 617 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 618 u64 t = mdesc_arc_target(hp, a); 619 const char *name; 620 const u64 *id; 621 622 name = mdesc_node_name(hp, t); 623 if (!strcmp(name, "cpu")) { 624 id = mdesc_get_property(hp, t, "id", NULL); 625 if (*id < NR_CPUS) 626 cpu_data(*id).core_id = core_id; 627 } else { 628 u64 j; 629 630 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) { 631 u64 n = mdesc_arc_target(hp, j); 632 const char *n_name; 633 634 n_name = mdesc_node_name(hp, n); 635 if (strcmp(n_name, "cpu")) 636 continue; 637 638 id = mdesc_get_property(hp, n, "id", NULL); 639 if (*id < NR_CPUS) 640 cpu_data(*id).core_id = core_id; 641 } 642 } 643 } 644 } 645 646 static void __cpuinit set_core_ids(struct mdesc_handle *hp) 647 { 648 int idx; 649 u64 mp; 650 651 idx = 1; 652 mdesc_for_each_node_by_name(hp, mp, "cache") { 653 const u64 *level; 654 const char *type; 655 int len; 656 657 level = mdesc_get_property(hp, mp, "level", NULL); 658 if (*level != 1) 659 continue; 660 661 type = mdesc_get_property(hp, mp, "type", &len); 662 if (!of_find_in_proplist(type, "instn", len)) 663 continue; 664 665 mark_core_ids(hp, mp, idx); 666 667 idx++; 668 } 669 } 670 671 static void __cpuinit mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id) 672 { 673 u64 a; 674 675 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 676 u64 t = mdesc_arc_target(hp, a); 677 const char *name; 678 const u64 *id; 679 680 name = mdesc_node_name(hp, t); 681 if (strcmp(name, "cpu")) 682 continue; 683 684 id = mdesc_get_property(hp, t, "id", NULL); 685 if (*id < NR_CPUS) 686 cpu_data(*id).proc_id = proc_id; 687 } 688 } 689 690 static void __cpuinit __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name) 691 { 692 int idx; 693 u64 mp; 694 695 idx = 0; 696 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) { 697 const char *type; 698 int len; 699 700 type = mdesc_get_property(hp, mp, "type", &len); 701 if (!of_find_in_proplist(type, "int", len) && 702 !of_find_in_proplist(type, "integer", len)) 703 continue; 704 705 mark_proc_ids(hp, mp, idx); 706 707 idx++; 708 } 709 } 710 711 static void __cpuinit set_proc_ids(struct mdesc_handle *hp) 712 { 713 __set_proc_ids(hp, "exec_unit"); 714 __set_proc_ids(hp, "exec-unit"); 715 } 716 717 static void __cpuinit get_one_mondo_bits(const u64 *p, unsigned int *mask, 718 unsigned char def) 719 { 720 u64 val; 721 722 if (!p) 723 goto use_default; 724 val = *p; 725 726 if (!val || val >= 64) 727 goto use_default; 728 729 *mask = ((1U << val) * 64U) - 1U; 730 return; 731 732 use_default: 733 *mask = ((1U << def) * 64U) - 1U; 734 } 735 736 static void __cpuinit get_mondo_data(struct mdesc_handle *hp, u64 mp, 737 struct trap_per_cpu *tb) 738 { 739 const u64 *val; 740 741 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL); 742 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7); 743 744 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL); 745 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7); 746 747 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL); 748 get_one_mondo_bits(val, &tb->resum_qmask, 6); 749 750 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL); 751 get_one_mondo_bits(val, &tb->nonresum_qmask, 2); 752 } 753 754 static void * __cpuinit mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask) 755 { 756 struct mdesc_handle *hp = mdesc_grab(); 757 void *ret = NULL; 758 u64 mp; 759 760 mdesc_for_each_node_by_name(hp, mp, "cpu") { 761 const u64 *id = mdesc_get_property(hp, mp, "id", NULL); 762 int cpuid = *id; 763 764 #ifdef CONFIG_SMP 765 if (cpuid >= NR_CPUS) { 766 printk(KERN_WARNING "Ignoring CPU %d which is " 767 ">= NR_CPUS (%d)\n", 768 cpuid, NR_CPUS); 769 continue; 770 } 771 if (!cpu_isset(cpuid, *mask)) 772 continue; 773 #endif 774 775 ret = func(hp, mp, cpuid, arg); 776 if (ret) 777 goto out; 778 } 779 out: 780 mdesc_release(hp); 781 return ret; 782 } 783 784 static void * __cpuinit record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg) 785 { 786 ncpus_probed++; 787 #ifdef CONFIG_SMP 788 set_cpu_present(cpuid, true); 789 #endif 790 return NULL; 791 } 792 793 void __cpuinit mdesc_populate_present_mask(cpumask_t *mask) 794 { 795 if (tlb_type != hypervisor) 796 return; 797 798 ncpus_probed = 0; 799 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask); 800 } 801 802 static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg) 803 { 804 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL); 805 struct trap_per_cpu *tb; 806 cpuinfo_sparc *c; 807 u64 a; 808 809 #ifndef CONFIG_SMP 810 /* On uniprocessor we only want the values for the 811 * real physical cpu the kernel booted onto, however 812 * cpu_data() only has one entry at index 0. 813 */ 814 if (cpuid != real_hard_smp_processor_id()) 815 return NULL; 816 cpuid = 0; 817 #endif 818 819 c = &cpu_data(cpuid); 820 c->clock_tick = *cfreq; 821 822 tb = &trap_block[cpuid]; 823 get_mondo_data(hp, mp, tb); 824 825 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 826 u64 j, t = mdesc_arc_target(hp, a); 827 const char *t_name; 828 829 t_name = mdesc_node_name(hp, t); 830 if (!strcmp(t_name, "cache")) { 831 fill_in_one_cache(c, hp, t); 832 continue; 833 } 834 835 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) { 836 u64 n = mdesc_arc_target(hp, j); 837 const char *n_name; 838 839 n_name = mdesc_node_name(hp, n); 840 if (!strcmp(n_name, "cache")) 841 fill_in_one_cache(c, hp, n); 842 } 843 } 844 845 c->core_id = 0; 846 c->proc_id = -1; 847 848 return NULL; 849 } 850 851 void __cpuinit mdesc_fill_in_cpu_data(cpumask_t *mask) 852 { 853 struct mdesc_handle *hp; 854 855 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask); 856 857 #ifdef CONFIG_SMP 858 sparc64_multi_core = 1; 859 #endif 860 861 hp = mdesc_grab(); 862 863 set_core_ids(hp); 864 set_proc_ids(hp); 865 866 mdesc_release(hp); 867 868 smp_fill_in_sib_core_maps(); 869 } 870 871 static ssize_t mdesc_read(struct file *file, char __user *buf, 872 size_t len, loff_t *offp) 873 { 874 struct mdesc_handle *hp = mdesc_grab(); 875 int err; 876 877 if (!hp) 878 return -ENODEV; 879 880 err = hp->handle_size; 881 if (len < hp->handle_size) 882 err = -EMSGSIZE; 883 else if (copy_to_user(buf, &hp->mdesc, hp->handle_size)) 884 err = -EFAULT; 885 mdesc_release(hp); 886 887 return err; 888 } 889 890 static const struct file_operations mdesc_fops = { 891 .read = mdesc_read, 892 .owner = THIS_MODULE, 893 }; 894 895 static struct miscdevice mdesc_misc = { 896 .minor = MISC_DYNAMIC_MINOR, 897 .name = "mdesc", 898 .fops = &mdesc_fops, 899 }; 900 901 static int __init mdesc_misc_init(void) 902 { 903 return misc_register(&mdesc_misc); 904 } 905 906 __initcall(mdesc_misc_init); 907 908 void __init sun4v_mdesc_init(void) 909 { 910 struct mdesc_handle *hp; 911 unsigned long len, real_len, status; 912 913 (void) sun4v_mach_desc(0UL, 0UL, &len); 914 915 printk("MDESC: Size is %lu bytes.\n", len); 916 917 hp = mdesc_alloc(len, &lmb_mdesc_ops); 918 if (hp == NULL) { 919 prom_printf("MDESC: alloc of %lu bytes failed.\n", len); 920 prom_halt(); 921 } 922 923 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 924 if (status != HV_EOK || real_len > len) { 925 prom_printf("sun4v_mach_desc fails, err(%lu), " 926 "len(%lu), real_len(%lu)\n", 927 status, len, real_len); 928 mdesc_free(hp); 929 prom_halt(); 930 } 931 932 cur_mdesc = hp; 933 934 report_platform_properties(); 935 } 936