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 <asm/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 */ 35 struct 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 42 struct 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 64 struct mdesc_mem_ops { 65 struct mdesc_handle *(*alloc)(unsigned int mdesc_size); 66 void (*free)(struct mdesc_handle *handle); 67 }; 68 69 struct 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 78 static 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 91 static 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 } 111 112 static 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 } 124 125 static struct mdesc_mem_ops memblock_mdesc_ops = { 126 .alloc = mdesc_memblock_alloc, 127 .free = mdesc_memblock_free, 128 }; 129 130 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size) 131 { 132 unsigned int handle_size; 133 void *base; 134 135 handle_size = (sizeof(struct mdesc_handle) - 136 sizeof(struct mdesc_hdr) + 137 mdesc_size); 138 139 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL); 140 if (base) { 141 struct mdesc_handle *hp; 142 unsigned long addr; 143 144 addr = (unsigned long)base; 145 addr = (addr + 15UL) & ~15UL; 146 hp = (struct mdesc_handle *) addr; 147 148 mdesc_handle_init(hp, handle_size, base); 149 return hp; 150 } 151 152 return NULL; 153 } 154 155 static 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 } 162 163 static struct mdesc_mem_ops kmalloc_mdesc_memops = { 164 .alloc = mdesc_kmalloc, 165 .free = mdesc_kfree, 166 }; 167 168 static 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 } 178 179 static void mdesc_free(struct mdesc_handle *hp) 180 { 181 hp->mops->free(hp); 182 } 183 184 static struct mdesc_handle *cur_mdesc; 185 static LIST_HEAD(mdesc_zombie_list); 186 static DEFINE_SPINLOCK(mdesc_lock); 187 188 struct 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 } 201 EXPORT_SYMBOL(mdesc_grab); 202 203 void 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 } 214 EXPORT_SYMBOL(mdesc_release); 215 216 static DEFINE_MUTEX(mdesc_mutex); 217 static struct mdesc_notifier_client *client_list; 218 219 void 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 } 232 233 static 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. */ 253 static 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 } 307 308 static 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 } 315 316 static 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 } 326 327 void 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); 365 366 out: 367 mutex_unlock(&mdesc_mutex); 368 } 369 370 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc) 371 { 372 return (struct mdesc_elem *) (mdesc + 1); 373 } 374 375 static void *name_block(struct mdesc_hdr *mdesc) 376 { 377 return ((void *) node_block(mdesc)) + mdesc->node_sz; 378 } 379 380 static void *data_block(struct mdesc_hdr *mdesc) 381 { 382 return ((void *) name_block(mdesc)) + mdesc->name_sz; 383 } 384 385 u64 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 } 412 EXPORT_SYMBOL(mdesc_node_by_name); 413 414 const 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 } 458 EXPORT_SYMBOL(mdesc_get_property); 459 460 u64 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 } 484 EXPORT_SYMBOL(mdesc_next_arc); 485 486 u64 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 } 494 EXPORT_SYMBOL(mdesc_arc_target); 495 496 const 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 } 511 EXPORT_SYMBOL(mdesc_node_name); 512 513 static u64 max_cpus = 64; 514 515 static 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 } 573 574 static 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 } 616 617 static void 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 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 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 __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 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 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 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 *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 *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 801 void *arg) 802 { 803 ncpus_probed++; 804 #ifdef CONFIG_SMP 805 set_cpu_present(cpuid, true); 806 #endif 807 return NULL; 808 } 809 810 void mdesc_populate_present_mask(cpumask_t *mask) 811 { 812 if (tlb_type != hypervisor) 813 return; 814 815 ncpus_probed = 0; 816 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask); 817 } 818 819 static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg) 820 { 821 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL); 822 unsigned long *pgsz_mask = arg; 823 u64 val; 824 825 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K | 826 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB); 827 if (pgsz_prop) 828 val = *pgsz_prop; 829 830 if (!*pgsz_mask) 831 *pgsz_mask = val; 832 else 833 *pgsz_mask &= val; 834 return NULL; 835 } 836 837 void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask) 838 { 839 *pgsz_mask = 0; 840 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask); 841 } 842 843 static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 844 void *arg) 845 { 846 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL); 847 struct trap_per_cpu *tb; 848 cpuinfo_sparc *c; 849 u64 a; 850 851 #ifndef CONFIG_SMP 852 /* On uniprocessor we only want the values for the 853 * real physical cpu the kernel booted onto, however 854 * cpu_data() only has one entry at index 0. 855 */ 856 if (cpuid != real_hard_smp_processor_id()) 857 return NULL; 858 cpuid = 0; 859 #endif 860 861 c = &cpu_data(cpuid); 862 c->clock_tick = *cfreq; 863 864 tb = &trap_block[cpuid]; 865 get_mondo_data(hp, mp, tb); 866 867 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 868 u64 j, t = mdesc_arc_target(hp, a); 869 const char *t_name; 870 871 t_name = mdesc_node_name(hp, t); 872 if (!strcmp(t_name, "cache")) { 873 fill_in_one_cache(c, hp, t); 874 continue; 875 } 876 877 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) { 878 u64 n = mdesc_arc_target(hp, j); 879 const char *n_name; 880 881 n_name = mdesc_node_name(hp, n); 882 if (!strcmp(n_name, "cache")) 883 fill_in_one_cache(c, hp, n); 884 } 885 } 886 887 c->core_id = 0; 888 c->proc_id = -1; 889 890 return NULL; 891 } 892 893 void mdesc_fill_in_cpu_data(cpumask_t *mask) 894 { 895 struct mdesc_handle *hp; 896 897 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask); 898 899 hp = mdesc_grab(); 900 901 set_core_ids(hp); 902 set_proc_ids(hp); 903 904 mdesc_release(hp); 905 906 smp_fill_in_sib_core_maps(); 907 } 908 909 /* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is 910 * opened. Hold this reference until /dev/mdesc is closed to ensure 911 * mdesc data structure is not released underneath us. Store the 912 * pointer to mdesc structure in private_data for read and seek to use 913 */ 914 static int mdesc_open(struct inode *inode, struct file *file) 915 { 916 struct mdesc_handle *hp = mdesc_grab(); 917 918 if (!hp) 919 return -ENODEV; 920 921 file->private_data = hp; 922 923 return 0; 924 } 925 926 static ssize_t mdesc_read(struct file *file, char __user *buf, 927 size_t len, loff_t *offp) 928 { 929 struct mdesc_handle *hp = file->private_data; 930 unsigned char *mdesc; 931 int bytes_left, count = len; 932 933 if (*offp >= hp->handle_size) 934 return 0; 935 936 bytes_left = hp->handle_size - *offp; 937 if (count > bytes_left) 938 count = bytes_left; 939 940 mdesc = (unsigned char *)&hp->mdesc; 941 mdesc += *offp; 942 if (!copy_to_user(buf, mdesc, count)) { 943 *offp += count; 944 return count; 945 } else { 946 return -EFAULT; 947 } 948 } 949 950 static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence) 951 { 952 struct mdesc_handle *hp; 953 954 switch (whence) { 955 case SEEK_CUR: 956 offset += file->f_pos; 957 break; 958 case SEEK_SET: 959 break; 960 default: 961 return -EINVAL; 962 } 963 964 hp = file->private_data; 965 if (offset > hp->handle_size) 966 return -EINVAL; 967 else 968 file->f_pos = offset; 969 970 return offset; 971 } 972 973 /* mdesc_close() - /dev/mdesc is being closed, release the reference to 974 * mdesc structure. 975 */ 976 static int mdesc_close(struct inode *inode, struct file *file) 977 { 978 mdesc_release(file->private_data); 979 return 0; 980 } 981 982 static const struct file_operations mdesc_fops = { 983 .open = mdesc_open, 984 .read = mdesc_read, 985 .llseek = mdesc_llseek, 986 .release = mdesc_close, 987 .owner = THIS_MODULE, 988 }; 989 990 static struct miscdevice mdesc_misc = { 991 .minor = MISC_DYNAMIC_MINOR, 992 .name = "mdesc", 993 .fops = &mdesc_fops, 994 }; 995 996 static int __init mdesc_misc_init(void) 997 { 998 return misc_register(&mdesc_misc); 999 } 1000 1001 __initcall(mdesc_misc_init); 1002 1003 void __init sun4v_mdesc_init(void) 1004 { 1005 struct mdesc_handle *hp; 1006 unsigned long len, real_len, status; 1007 1008 (void) sun4v_mach_desc(0UL, 0UL, &len); 1009 1010 printk("MDESC: Size is %lu bytes.\n", len); 1011 1012 hp = mdesc_alloc(len, &memblock_mdesc_ops); 1013 if (hp == NULL) { 1014 prom_printf("MDESC: alloc of %lu bytes failed.\n", len); 1015 prom_halt(); 1016 } 1017 1018 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 1019 if (status != HV_EOK || real_len > len) { 1020 prom_printf("sun4v_mach_desc fails, err(%lu), " 1021 "len(%lu), real_len(%lu)\n", 1022 status, len, real_len); 1023 mdesc_free(hp); 1024 prom_halt(); 1025 } 1026 1027 cur_mdesc = hp; 1028 1029 report_platform_properties(); 1030 } 1031