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