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 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 } 154 155 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 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 } 638 639 static 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 } 647 648 static void __mark_sock_id(struct mdesc_handle *hp, u64 node, 649 int sock_id) 650 { 651 const u64 *id = mdesc_get_property(hp, node, "id", NULL); 652 653 if (*id < num_possible_cpus()) 654 cpu_data(*id).sock_id = sock_id; 655 } 656 657 static void mark_core_ids(struct mdesc_handle *hp, u64 mp, 658 int core_id) 659 { 660 find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10); 661 } 662 663 static void mark_sock_ids(struct mdesc_handle *hp, u64 mp, 664 int sock_id) 665 { 666 find_back_node_value(hp, mp, "cpu", __mark_sock_id, sock_id, 10); 667 } 668 669 static void set_core_ids(struct mdesc_handle *hp) 670 { 671 int idx; 672 u64 mp; 673 674 idx = 1; 675 676 /* Identify unique cores by looking for cpus backpointed to by 677 * level 1 instruction caches. 678 */ 679 mdesc_for_each_node_by_name(hp, mp, "cache") { 680 const u64 *level; 681 const char *type; 682 int len; 683 684 level = mdesc_get_property(hp, mp, "level", NULL); 685 if (*level != 1) 686 continue; 687 688 type = mdesc_get_property(hp, mp, "type", &len); 689 if (!of_find_in_proplist(type, "instn", len)) 690 continue; 691 692 mark_core_ids(hp, mp, idx); 693 idx++; 694 } 695 } 696 697 static int set_sock_ids_by_cache(struct mdesc_handle *hp, int level) 698 { 699 u64 mp; 700 int idx = 1; 701 int fnd = 0; 702 703 /* Identify unique sockets by looking for cpus backpointed to by 704 * shared level n caches. 705 */ 706 mdesc_for_each_node_by_name(hp, mp, "cache") { 707 const u64 *cur_lvl; 708 709 cur_lvl = mdesc_get_property(hp, mp, "level", NULL); 710 if (*cur_lvl != level) 711 continue; 712 713 mark_sock_ids(hp, mp, idx); 714 idx++; 715 fnd = 1; 716 } 717 return fnd; 718 } 719 720 static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp) 721 { 722 int idx = 1; 723 724 mdesc_for_each_node_by_name(hp, mp, "socket") { 725 u64 a; 726 727 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 728 u64 t = mdesc_arc_target(hp, a); 729 const char *name; 730 const u64 *id; 731 732 name = mdesc_node_name(hp, t); 733 if (strcmp(name, "cpu")) 734 continue; 735 736 id = mdesc_get_property(hp, t, "id", NULL); 737 if (*id < num_possible_cpus()) 738 cpu_data(*id).sock_id = idx; 739 } 740 idx++; 741 } 742 } 743 744 static void set_sock_ids(struct mdesc_handle *hp) 745 { 746 u64 mp; 747 748 /* If machine description exposes sockets data use it. 749 * Otherwise fallback to use shared L3 or L2 caches. 750 */ 751 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets"); 752 if (mp != MDESC_NODE_NULL) 753 return set_sock_ids_by_socket(hp, mp); 754 755 if (!set_sock_ids_by_cache(hp, 3)) 756 set_sock_ids_by_cache(hp, 2); 757 } 758 759 static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id) 760 { 761 u64 a; 762 763 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 764 u64 t = mdesc_arc_target(hp, a); 765 const char *name; 766 const u64 *id; 767 768 name = mdesc_node_name(hp, t); 769 if (strcmp(name, "cpu")) 770 continue; 771 772 id = mdesc_get_property(hp, t, "id", NULL); 773 if (*id < NR_CPUS) 774 cpu_data(*id).proc_id = proc_id; 775 } 776 } 777 778 static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name) 779 { 780 int idx; 781 u64 mp; 782 783 idx = 0; 784 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) { 785 const char *type; 786 int len; 787 788 type = mdesc_get_property(hp, mp, "type", &len); 789 if (!of_find_in_proplist(type, "int", len) && 790 !of_find_in_proplist(type, "integer", len)) 791 continue; 792 793 mark_proc_ids(hp, mp, idx); 794 idx++; 795 } 796 } 797 798 static void set_proc_ids(struct mdesc_handle *hp) 799 { 800 __set_proc_ids(hp, "exec_unit"); 801 __set_proc_ids(hp, "exec-unit"); 802 } 803 804 static void get_one_mondo_bits(const u64 *p, unsigned int *mask, 805 unsigned long def, unsigned long max) 806 { 807 u64 val; 808 809 if (!p) 810 goto use_default; 811 val = *p; 812 813 if (!val || val >= 64) 814 goto use_default; 815 816 if (val > max) 817 val = max; 818 819 *mask = ((1U << val) * 64U) - 1U; 820 return; 821 822 use_default: 823 *mask = ((1U << def) * 64U) - 1U; 824 } 825 826 static void get_mondo_data(struct mdesc_handle *hp, u64 mp, 827 struct trap_per_cpu *tb) 828 { 829 static int printed; 830 const u64 *val; 831 832 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL); 833 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2)); 834 835 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL); 836 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8); 837 838 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL); 839 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7); 840 841 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL); 842 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2); 843 if (!printed++) { 844 pr_info("SUN4V: Mondo queue sizes " 845 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n", 846 tb->cpu_mondo_qmask + 1, 847 tb->dev_mondo_qmask + 1, 848 tb->resum_qmask + 1, 849 tb->nonresum_qmask + 1); 850 } 851 } 852 853 static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask) 854 { 855 struct mdesc_handle *hp = mdesc_grab(); 856 void *ret = NULL; 857 u64 mp; 858 859 mdesc_for_each_node_by_name(hp, mp, "cpu") { 860 const u64 *id = mdesc_get_property(hp, mp, "id", NULL); 861 int cpuid = *id; 862 863 #ifdef CONFIG_SMP 864 if (cpuid >= NR_CPUS) { 865 printk(KERN_WARNING "Ignoring CPU %d which is " 866 ">= NR_CPUS (%d)\n", 867 cpuid, NR_CPUS); 868 continue; 869 } 870 if (!cpumask_test_cpu(cpuid, mask)) 871 continue; 872 #endif 873 874 ret = func(hp, mp, cpuid, arg); 875 if (ret) 876 goto out; 877 } 878 out: 879 mdesc_release(hp); 880 return ret; 881 } 882 883 static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 884 void *arg) 885 { 886 ncpus_probed++; 887 #ifdef CONFIG_SMP 888 set_cpu_present(cpuid, true); 889 #endif 890 return NULL; 891 } 892 893 void mdesc_populate_present_mask(cpumask_t *mask) 894 { 895 if (tlb_type != hypervisor) 896 return; 897 898 ncpus_probed = 0; 899 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask); 900 } 901 902 static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg) 903 { 904 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL); 905 unsigned long *pgsz_mask = arg; 906 u64 val; 907 908 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K | 909 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB); 910 if (pgsz_prop) 911 val = *pgsz_prop; 912 913 if (!*pgsz_mask) 914 *pgsz_mask = val; 915 else 916 *pgsz_mask &= val; 917 return NULL; 918 } 919 920 void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask) 921 { 922 *pgsz_mask = 0; 923 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask); 924 } 925 926 static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 927 void *arg) 928 { 929 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL); 930 struct trap_per_cpu *tb; 931 cpuinfo_sparc *c; 932 u64 a; 933 934 #ifndef CONFIG_SMP 935 /* On uniprocessor we only want the values for the 936 * real physical cpu the kernel booted onto, however 937 * cpu_data() only has one entry at index 0. 938 */ 939 if (cpuid != real_hard_smp_processor_id()) 940 return NULL; 941 cpuid = 0; 942 #endif 943 944 c = &cpu_data(cpuid); 945 c->clock_tick = *cfreq; 946 947 tb = &trap_block[cpuid]; 948 get_mondo_data(hp, mp, tb); 949 950 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 951 u64 j, t = mdesc_arc_target(hp, a); 952 const char *t_name; 953 954 t_name = mdesc_node_name(hp, t); 955 if (!strcmp(t_name, "cache")) { 956 fill_in_one_cache(c, hp, t); 957 continue; 958 } 959 960 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) { 961 u64 n = mdesc_arc_target(hp, j); 962 const char *n_name; 963 964 n_name = mdesc_node_name(hp, n); 965 if (!strcmp(n_name, "cache")) 966 fill_in_one_cache(c, hp, n); 967 } 968 } 969 970 c->core_id = 0; 971 c->proc_id = -1; 972 973 return NULL; 974 } 975 976 void mdesc_fill_in_cpu_data(cpumask_t *mask) 977 { 978 struct mdesc_handle *hp; 979 980 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask); 981 982 hp = mdesc_grab(); 983 984 set_core_ids(hp); 985 set_proc_ids(hp); 986 set_sock_ids(hp); 987 988 mdesc_release(hp); 989 990 smp_fill_in_sib_core_maps(); 991 } 992 993 /* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is 994 * opened. Hold this reference until /dev/mdesc is closed to ensure 995 * mdesc data structure is not released underneath us. Store the 996 * pointer to mdesc structure in private_data for read and seek to use 997 */ 998 static int mdesc_open(struct inode *inode, struct file *file) 999 { 1000 struct mdesc_handle *hp = mdesc_grab(); 1001 1002 if (!hp) 1003 return -ENODEV; 1004 1005 file->private_data = hp; 1006 1007 return 0; 1008 } 1009 1010 static ssize_t mdesc_read(struct file *file, char __user *buf, 1011 size_t len, loff_t *offp) 1012 { 1013 struct mdesc_handle *hp = file->private_data; 1014 unsigned char *mdesc; 1015 int bytes_left, count = len; 1016 1017 if (*offp >= hp->handle_size) 1018 return 0; 1019 1020 bytes_left = hp->handle_size - *offp; 1021 if (count > bytes_left) 1022 count = bytes_left; 1023 1024 mdesc = (unsigned char *)&hp->mdesc; 1025 mdesc += *offp; 1026 if (!copy_to_user(buf, mdesc, count)) { 1027 *offp += count; 1028 return count; 1029 } else { 1030 return -EFAULT; 1031 } 1032 } 1033 1034 static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence) 1035 { 1036 struct mdesc_handle *hp = file->private_data; 1037 1038 return no_seek_end_llseek_size(file, offset, whence, hp->handle_size); 1039 } 1040 1041 /* mdesc_close() - /dev/mdesc is being closed, release the reference to 1042 * mdesc structure. 1043 */ 1044 static int mdesc_close(struct inode *inode, struct file *file) 1045 { 1046 mdesc_release(file->private_data); 1047 return 0; 1048 } 1049 1050 static const struct file_operations mdesc_fops = { 1051 .open = mdesc_open, 1052 .read = mdesc_read, 1053 .llseek = mdesc_llseek, 1054 .release = mdesc_close, 1055 .owner = THIS_MODULE, 1056 }; 1057 1058 static struct miscdevice mdesc_misc = { 1059 .minor = MISC_DYNAMIC_MINOR, 1060 .name = "mdesc", 1061 .fops = &mdesc_fops, 1062 }; 1063 1064 static int __init mdesc_misc_init(void) 1065 { 1066 return misc_register(&mdesc_misc); 1067 } 1068 1069 __initcall(mdesc_misc_init); 1070 1071 void __init sun4v_mdesc_init(void) 1072 { 1073 struct mdesc_handle *hp; 1074 unsigned long len, real_len, status; 1075 1076 (void) sun4v_mach_desc(0UL, 0UL, &len); 1077 1078 printk("MDESC: Size is %lu bytes.\n", len); 1079 1080 hp = mdesc_alloc(len, &memblock_mdesc_ops); 1081 if (hp == NULL) { 1082 prom_printf("MDESC: alloc of %lu bytes failed.\n", len); 1083 prom_halt(); 1084 } 1085 1086 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 1087 if (status != HV_EOK || real_len > len) { 1088 prom_printf("sun4v_mach_desc fails, err(%lu), " 1089 "len(%lu), real_len(%lu)\n", 1090 status, len, real_len); 1091 mdesc_free(hp); 1092 prom_halt(); 1093 } 1094 1095 cur_mdesc = hp; 1096 1097 report_platform_properties(); 1098 } 1099