1 /* mdesc.c: Sun4V machine description handling. 2 * 3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> 4 */ 5 #include <linux/kernel.h> 6 #include <linux/types.h> 7 #include <linux/memblock.h> 8 #include <linux/log2.h> 9 #include <linux/list.h> 10 #include <linux/slab.h> 11 #include <linux/mm.h> 12 #include <linux/miscdevice.h> 13 #include <linux/bootmem.h> 14 #include <linux/export.h> 15 16 #include <asm/cpudata.h> 17 #include <asm/hypervisor.h> 18 #include <asm/mdesc.h> 19 #include <asm/prom.h> 20 #include <linux/uaccess.h> 21 #include <asm/oplib.h> 22 #include <asm/smp.h> 23 24 /* Unlike the OBP device tree, the machine description is a full-on 25 * DAG. An arbitrary number of ARCs are possible from one 26 * node to other nodes and thus we can't use the OBP device_node 27 * data structure to represent these nodes inside of the kernel. 28 * 29 * Actually, it isn't even a DAG, because there are back pointers 30 * which create cycles in the graph. 31 * 32 * mdesc_hdr and mdesc_elem describe the layout of the data structure 33 * we get from the Hypervisor. 34 */ 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 typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64, 79 union md_node_info *); 80 typedef void (*mdesc_node_info_rel_f)(union md_node_info *); 81 typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *); 82 83 struct md_node_ops { 84 char *name; 85 mdesc_node_info_get_f get_info; 86 mdesc_node_info_rel_f rel_info; 87 mdesc_node_match_f node_match; 88 }; 89 90 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node, 91 union md_node_info *node_info); 92 static void rel_vdev_port_node_info(union md_node_info *node_info); 93 static bool vdev_port_node_match(union md_node_info *a_node_info, 94 union md_node_info *b_node_info); 95 96 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node, 97 union md_node_info *node_info); 98 static void rel_ds_port_node_info(union md_node_info *node_info); 99 static bool ds_port_node_match(union md_node_info *a_node_info, 100 union md_node_info *b_node_info); 101 102 /* supported node types which can be registered */ 103 static struct md_node_ops md_node_ops_table[] = { 104 {"virtual-device-port", get_vdev_port_node_info, 105 rel_vdev_port_node_info, vdev_port_node_match}, 106 {"domain-services-port", get_ds_port_node_info, 107 rel_ds_port_node_info, ds_port_node_match}, 108 {NULL, NULL, NULL, NULL} 109 }; 110 111 static void mdesc_get_node_ops(const char *node_name, 112 mdesc_node_info_get_f *get_info_f, 113 mdesc_node_info_rel_f *rel_info_f, 114 mdesc_node_match_f *match_f) 115 { 116 int i; 117 118 if (get_info_f) 119 *get_info_f = NULL; 120 121 if (rel_info_f) 122 *rel_info_f = NULL; 123 124 if (match_f) 125 *match_f = NULL; 126 127 if (!node_name) 128 return; 129 130 for (i = 0; md_node_ops_table[i].name != NULL; i++) { 131 if (strcmp(md_node_ops_table[i].name, node_name) == 0) { 132 if (get_info_f) 133 *get_info_f = md_node_ops_table[i].get_info; 134 135 if (rel_info_f) 136 *rel_info_f = md_node_ops_table[i].rel_info; 137 138 if (match_f) 139 *match_f = md_node_ops_table[i].node_match; 140 141 break; 142 } 143 } 144 } 145 146 static void mdesc_handle_init(struct mdesc_handle *hp, 147 unsigned int handle_size, 148 void *base) 149 { 150 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1)); 151 152 memset(hp, 0, handle_size); 153 INIT_LIST_HEAD(&hp->list); 154 hp->self_base = base; 155 atomic_set(&hp->refcnt, 1); 156 hp->handle_size = handle_size; 157 } 158 159 static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size) 160 { 161 unsigned int handle_size, alloc_size; 162 struct mdesc_handle *hp; 163 unsigned long paddr; 164 165 handle_size = (sizeof(struct mdesc_handle) - 166 sizeof(struct mdesc_hdr) + 167 mdesc_size); 168 alloc_size = PAGE_ALIGN(handle_size); 169 170 paddr = memblock_alloc(alloc_size, PAGE_SIZE); 171 172 hp = NULL; 173 if (paddr) { 174 hp = __va(paddr); 175 mdesc_handle_init(hp, handle_size, hp); 176 } 177 return hp; 178 } 179 180 static void __init mdesc_memblock_free(struct mdesc_handle *hp) 181 { 182 unsigned int alloc_size; 183 unsigned long start; 184 185 BUG_ON(atomic_read(&hp->refcnt) != 0); 186 BUG_ON(!list_empty(&hp->list)); 187 188 alloc_size = PAGE_ALIGN(hp->handle_size); 189 start = __pa(hp); 190 free_bootmem_late(start, alloc_size); 191 } 192 193 static struct mdesc_mem_ops memblock_mdesc_ops = { 194 .alloc = mdesc_memblock_alloc, 195 .free = mdesc_memblock_free, 196 }; 197 198 static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size) 199 { 200 unsigned int handle_size; 201 struct mdesc_handle *hp; 202 unsigned long addr; 203 void *base; 204 205 handle_size = (sizeof(struct mdesc_handle) - 206 sizeof(struct mdesc_hdr) + 207 mdesc_size); 208 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_RETRY_MAYFAIL); 209 if (!base) 210 return NULL; 211 212 addr = (unsigned long)base; 213 addr = (addr + 15UL) & ~15UL; 214 hp = (struct mdesc_handle *) addr; 215 216 mdesc_handle_init(hp, handle_size, base); 217 218 return hp; 219 } 220 221 static void mdesc_kfree(struct mdesc_handle *hp) 222 { 223 BUG_ON(atomic_read(&hp->refcnt) != 0); 224 BUG_ON(!list_empty(&hp->list)); 225 226 kfree(hp->self_base); 227 } 228 229 static struct mdesc_mem_ops kmalloc_mdesc_memops = { 230 .alloc = mdesc_kmalloc, 231 .free = mdesc_kfree, 232 }; 233 234 static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size, 235 struct mdesc_mem_ops *mops) 236 { 237 struct mdesc_handle *hp = mops->alloc(mdesc_size); 238 239 if (hp) 240 hp->mops = mops; 241 242 return hp; 243 } 244 245 static void mdesc_free(struct mdesc_handle *hp) 246 { 247 hp->mops->free(hp); 248 } 249 250 static struct mdesc_handle *cur_mdesc; 251 static LIST_HEAD(mdesc_zombie_list); 252 static DEFINE_SPINLOCK(mdesc_lock); 253 254 struct mdesc_handle *mdesc_grab(void) 255 { 256 struct mdesc_handle *hp; 257 unsigned long flags; 258 259 spin_lock_irqsave(&mdesc_lock, flags); 260 hp = cur_mdesc; 261 if (hp) 262 atomic_inc(&hp->refcnt); 263 spin_unlock_irqrestore(&mdesc_lock, flags); 264 265 return hp; 266 } 267 EXPORT_SYMBOL(mdesc_grab); 268 269 void mdesc_release(struct mdesc_handle *hp) 270 { 271 unsigned long flags; 272 273 spin_lock_irqsave(&mdesc_lock, flags); 274 if (atomic_dec_and_test(&hp->refcnt)) { 275 list_del_init(&hp->list); 276 hp->mops->free(hp); 277 } 278 spin_unlock_irqrestore(&mdesc_lock, flags); 279 } 280 EXPORT_SYMBOL(mdesc_release); 281 282 static DEFINE_MUTEX(mdesc_mutex); 283 static struct mdesc_notifier_client *client_list; 284 285 void mdesc_register_notifier(struct mdesc_notifier_client *client) 286 { 287 bool supported = false; 288 u64 node; 289 int i; 290 291 mutex_lock(&mdesc_mutex); 292 293 /* check to see if the node is supported for registration */ 294 for (i = 0; md_node_ops_table[i].name != NULL; i++) { 295 if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) { 296 supported = true; 297 break; 298 } 299 } 300 301 if (!supported) { 302 pr_err("MD: %s node not supported\n", client->node_name); 303 mutex_unlock(&mdesc_mutex); 304 return; 305 } 306 307 client->next = client_list; 308 client_list = client; 309 310 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name) 311 client->add(cur_mdesc, node, client->node_name); 312 313 mutex_unlock(&mdesc_mutex); 314 } 315 316 static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node) 317 { 318 const u64 *id; 319 u64 a; 320 321 id = NULL; 322 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 323 u64 target; 324 325 target = mdesc_arc_target(hp, a); 326 id = mdesc_get_property(hp, target, 327 "cfg-handle", NULL); 328 if (id) 329 break; 330 } 331 332 return id; 333 } 334 335 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node, 336 union md_node_info *node_info) 337 { 338 const u64 *parent_cfg_hdlp; 339 const char *name; 340 const u64 *idp; 341 342 /* 343 * Virtual device nodes are distinguished by: 344 * 1. "id" property 345 * 2. "name" property 346 * 3. parent node "cfg-handle" property 347 */ 348 idp = mdesc_get_property(md, node, "id", NULL); 349 name = mdesc_get_property(md, node, "name", NULL); 350 parent_cfg_hdlp = parent_cfg_handle(md, node); 351 352 if (!idp || !name || !parent_cfg_hdlp) 353 return -1; 354 355 node_info->vdev_port.id = *idp; 356 node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL); 357 node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp; 358 359 return 0; 360 } 361 362 static void rel_vdev_port_node_info(union md_node_info *node_info) 363 { 364 if (node_info && node_info->vdev_port.name) { 365 kfree_const(node_info->vdev_port.name); 366 node_info->vdev_port.name = NULL; 367 } 368 } 369 370 static bool vdev_port_node_match(union md_node_info *a_node_info, 371 union md_node_info *b_node_info) 372 { 373 if (a_node_info->vdev_port.id != b_node_info->vdev_port.id) 374 return false; 375 376 if (a_node_info->vdev_port.parent_cfg_hdl != 377 b_node_info->vdev_port.parent_cfg_hdl) 378 return false; 379 380 if (strncmp(a_node_info->vdev_port.name, 381 b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0) 382 return false; 383 384 return true; 385 } 386 387 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node, 388 union md_node_info *node_info) 389 { 390 const u64 *idp; 391 392 /* DS port nodes use the "id" property to distinguish them */ 393 idp = mdesc_get_property(md, node, "id", NULL); 394 if (!idp) 395 return -1; 396 397 node_info->ds_port.id = *idp; 398 399 return 0; 400 } 401 402 static void rel_ds_port_node_info(union md_node_info *node_info) 403 { 404 } 405 406 static bool ds_port_node_match(union md_node_info *a_node_info, 407 union md_node_info *b_node_info) 408 { 409 if (a_node_info->ds_port.id != b_node_info->ds_port.id) 410 return false; 411 412 return true; 413 } 414 415 /* Run 'func' on nodes which are in A but not in B. */ 416 static void invoke_on_missing(const char *name, 417 struct mdesc_handle *a, 418 struct mdesc_handle *b, 419 void (*func)(struct mdesc_handle *, u64, 420 const char *node_name)) 421 { 422 mdesc_node_info_get_f get_info_func; 423 mdesc_node_info_rel_f rel_info_func; 424 mdesc_node_match_f node_match_func; 425 union md_node_info a_node_info; 426 union md_node_info b_node_info; 427 bool found; 428 u64 a_node; 429 u64 b_node; 430 int rv; 431 432 /* 433 * Find the get_info, rel_info and node_match ops for the given 434 * node name 435 */ 436 mdesc_get_node_ops(name, &get_info_func, &rel_info_func, 437 &node_match_func); 438 439 /* If we didn't find a match, the node type is not supported */ 440 if (!get_info_func || !rel_info_func || !node_match_func) { 441 pr_err("MD: %s node type is not supported\n", name); 442 return; 443 } 444 445 mdesc_for_each_node_by_name(a, a_node, name) { 446 found = false; 447 448 rv = get_info_func(a, a_node, &a_node_info); 449 if (rv != 0) { 450 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n", 451 name); 452 continue; 453 } 454 455 /* Check each node in B for node matching a_node */ 456 mdesc_for_each_node_by_name(b, b_node, name) { 457 rv = get_info_func(b, b_node, &b_node_info); 458 if (rv != 0) 459 continue; 460 461 if (node_match_func(&a_node_info, &b_node_info)) { 462 found = true; 463 rel_info_func(&b_node_info); 464 break; 465 } 466 467 rel_info_func(&b_node_info); 468 } 469 470 rel_info_func(&a_node_info); 471 472 if (!found) 473 func(a, a_node, name); 474 } 475 } 476 477 static void notify_one(struct mdesc_notifier_client *p, 478 struct mdesc_handle *old_hp, 479 struct mdesc_handle *new_hp) 480 { 481 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove); 482 invoke_on_missing(p->node_name, new_hp, old_hp, p->add); 483 } 484 485 static void mdesc_notify_clients(struct mdesc_handle *old_hp, 486 struct mdesc_handle *new_hp) 487 { 488 struct mdesc_notifier_client *p = client_list; 489 490 while (p) { 491 notify_one(p, old_hp, new_hp); 492 p = p->next; 493 } 494 } 495 496 void mdesc_update(void) 497 { 498 unsigned long len, real_len, status; 499 struct mdesc_handle *hp, *orig_hp; 500 unsigned long flags; 501 502 mutex_lock(&mdesc_mutex); 503 504 (void) sun4v_mach_desc(0UL, 0UL, &len); 505 506 hp = mdesc_alloc(len, &kmalloc_mdesc_memops); 507 if (!hp) { 508 printk(KERN_ERR "MD: mdesc alloc fails\n"); 509 goto out; 510 } 511 512 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 513 if (status != HV_EOK || real_len > len) { 514 printk(KERN_ERR "MD: mdesc reread fails with %lu\n", 515 status); 516 atomic_dec(&hp->refcnt); 517 mdesc_free(hp); 518 goto out; 519 } 520 521 spin_lock_irqsave(&mdesc_lock, flags); 522 orig_hp = cur_mdesc; 523 cur_mdesc = hp; 524 spin_unlock_irqrestore(&mdesc_lock, flags); 525 526 mdesc_notify_clients(orig_hp, hp); 527 528 spin_lock_irqsave(&mdesc_lock, flags); 529 if (atomic_dec_and_test(&orig_hp->refcnt)) 530 mdesc_free(orig_hp); 531 else 532 list_add(&orig_hp->list, &mdesc_zombie_list); 533 spin_unlock_irqrestore(&mdesc_lock, flags); 534 535 out: 536 mutex_unlock(&mdesc_mutex); 537 } 538 539 u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name, 540 union md_node_info *node_info) 541 { 542 mdesc_node_info_get_f get_info_func; 543 mdesc_node_info_rel_f rel_info_func; 544 mdesc_node_match_f node_match_func; 545 union md_node_info hp_node_info; 546 u64 hp_node; 547 int rv; 548 549 if (hp == NULL || node_name == NULL || node_info == NULL) 550 return MDESC_NODE_NULL; 551 552 /* Find the ops for the given node name */ 553 mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func, 554 &node_match_func); 555 556 /* If we didn't find ops for the given node name, it is not supported */ 557 if (!get_info_func || !rel_info_func || !node_match_func) { 558 pr_err("MD: %s node is not supported\n", node_name); 559 return -EINVAL; 560 } 561 562 mdesc_for_each_node_by_name(hp, hp_node, node_name) { 563 rv = get_info_func(hp, hp_node, &hp_node_info); 564 if (rv != 0) 565 continue; 566 567 if (node_match_func(node_info, &hp_node_info)) 568 break; 569 570 rel_info_func(&hp_node_info); 571 } 572 573 rel_info_func(&hp_node_info); 574 575 return hp_node; 576 } 577 EXPORT_SYMBOL(mdesc_get_node); 578 579 int mdesc_get_node_info(struct mdesc_handle *hp, u64 node, 580 const char *node_name, union md_node_info *node_info) 581 { 582 mdesc_node_info_get_f get_info_func; 583 int rv; 584 585 if (hp == NULL || node == MDESC_NODE_NULL || 586 node_name == NULL || node_info == NULL) 587 return -EINVAL; 588 589 /* Find the get_info op for the given node name */ 590 mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL); 591 592 /* If we didn't find a get_info_func, the node name is not supported */ 593 if (get_info_func == NULL) { 594 pr_err("MD: %s node is not supported\n", node_name); 595 return -EINVAL; 596 } 597 598 rv = get_info_func(hp, node, node_info); 599 if (rv != 0) { 600 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n", 601 node_name); 602 return -1; 603 } 604 605 return 0; 606 } 607 EXPORT_SYMBOL(mdesc_get_node_info); 608 609 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc) 610 { 611 return (struct mdesc_elem *) (mdesc + 1); 612 } 613 614 static void *name_block(struct mdesc_hdr *mdesc) 615 { 616 return ((void *) node_block(mdesc)) + mdesc->node_sz; 617 } 618 619 static void *data_block(struct mdesc_hdr *mdesc) 620 { 621 return ((void *) name_block(mdesc)) + mdesc->name_sz; 622 } 623 624 u64 mdesc_node_by_name(struct mdesc_handle *hp, 625 u64 from_node, const char *name) 626 { 627 struct mdesc_elem *ep = node_block(&hp->mdesc); 628 const char *names = name_block(&hp->mdesc); 629 u64 last_node = hp->mdesc.node_sz / 16; 630 u64 ret; 631 632 if (from_node == MDESC_NODE_NULL) { 633 ret = from_node = 0; 634 } else if (from_node >= last_node) { 635 return MDESC_NODE_NULL; 636 } else { 637 ret = ep[from_node].d.val; 638 } 639 640 while (ret < last_node) { 641 if (ep[ret].tag != MD_NODE) 642 return MDESC_NODE_NULL; 643 if (!strcmp(names + ep[ret].name_offset, name)) 644 break; 645 ret = ep[ret].d.val; 646 } 647 if (ret >= last_node) 648 ret = MDESC_NODE_NULL; 649 return ret; 650 } 651 EXPORT_SYMBOL(mdesc_node_by_name); 652 653 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node, 654 const char *name, int *lenp) 655 { 656 const char *names = name_block(&hp->mdesc); 657 u64 last_node = hp->mdesc.node_sz / 16; 658 void *data = data_block(&hp->mdesc); 659 struct mdesc_elem *ep; 660 661 if (node == MDESC_NODE_NULL || node >= last_node) 662 return NULL; 663 664 ep = node_block(&hp->mdesc) + node; 665 ep++; 666 for (; ep->tag != MD_NODE_END; ep++) { 667 void *val = NULL; 668 int len = 0; 669 670 switch (ep->tag) { 671 case MD_PROP_VAL: 672 val = &ep->d.val; 673 len = 8; 674 break; 675 676 case MD_PROP_STR: 677 case MD_PROP_DATA: 678 val = data + ep->d.data.data_offset; 679 len = ep->d.data.data_len; 680 break; 681 682 default: 683 break; 684 } 685 if (!val) 686 continue; 687 688 if (!strcmp(names + ep->name_offset, name)) { 689 if (lenp) 690 *lenp = len; 691 return val; 692 } 693 } 694 695 return NULL; 696 } 697 EXPORT_SYMBOL(mdesc_get_property); 698 699 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type) 700 { 701 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 702 const char *names = name_block(&hp->mdesc); 703 u64 last_node = hp->mdesc.node_sz / 16; 704 705 if (from == MDESC_NODE_NULL || from >= last_node) 706 return MDESC_NODE_NULL; 707 708 ep = base + from; 709 710 ep++; 711 for (; ep->tag != MD_NODE_END; ep++) { 712 if (ep->tag != MD_PROP_ARC) 713 continue; 714 715 if (strcmp(names + ep->name_offset, arc_type)) 716 continue; 717 718 return ep - base; 719 } 720 721 return MDESC_NODE_NULL; 722 } 723 EXPORT_SYMBOL(mdesc_next_arc); 724 725 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc) 726 { 727 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 728 729 ep = base + arc; 730 731 return ep->d.val; 732 } 733 EXPORT_SYMBOL(mdesc_arc_target); 734 735 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node) 736 { 737 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 738 const char *names = name_block(&hp->mdesc); 739 u64 last_node = hp->mdesc.node_sz / 16; 740 741 if (node == MDESC_NODE_NULL || node >= last_node) 742 return NULL; 743 744 ep = base + node; 745 if (ep->tag != MD_NODE) 746 return NULL; 747 748 return names + ep->name_offset; 749 } 750 EXPORT_SYMBOL(mdesc_node_name); 751 752 static u64 max_cpus = 64; 753 754 static void __init report_platform_properties(void) 755 { 756 struct mdesc_handle *hp = mdesc_grab(); 757 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); 758 const char *s; 759 const u64 *v; 760 761 if (pn == MDESC_NODE_NULL) { 762 prom_printf("No platform node in machine-description.\n"); 763 prom_halt(); 764 } 765 766 s = mdesc_get_property(hp, pn, "banner-name", NULL); 767 printk("PLATFORM: banner-name [%s]\n", s); 768 s = mdesc_get_property(hp, pn, "name", NULL); 769 printk("PLATFORM: name [%s]\n", s); 770 771 v = mdesc_get_property(hp, pn, "hostid", NULL); 772 if (v) 773 printk("PLATFORM: hostid [%08llx]\n", *v); 774 v = mdesc_get_property(hp, pn, "serial#", NULL); 775 if (v) 776 printk("PLATFORM: serial# [%08llx]\n", *v); 777 v = mdesc_get_property(hp, pn, "stick-frequency", NULL); 778 printk("PLATFORM: stick-frequency [%08llx]\n", *v); 779 v = mdesc_get_property(hp, pn, "mac-address", NULL); 780 if (v) 781 printk("PLATFORM: mac-address [%llx]\n", *v); 782 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL); 783 if (v) 784 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v); 785 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL); 786 if (v) 787 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v); 788 v = mdesc_get_property(hp, pn, "max-cpus", NULL); 789 if (v) { 790 max_cpus = *v; 791 printk("PLATFORM: max-cpus [%llu]\n", max_cpus); 792 } 793 794 #ifdef CONFIG_SMP 795 { 796 int max_cpu, i; 797 798 if (v) { 799 max_cpu = *v; 800 if (max_cpu > NR_CPUS) 801 max_cpu = NR_CPUS; 802 } else { 803 max_cpu = NR_CPUS; 804 } 805 for (i = 0; i < max_cpu; i++) 806 set_cpu_possible(i, true); 807 } 808 #endif 809 810 mdesc_release(hp); 811 } 812 813 static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp) 814 { 815 const u64 *level = mdesc_get_property(hp, mp, "level", NULL); 816 const u64 *size = mdesc_get_property(hp, mp, "size", NULL); 817 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL); 818 const char *type; 819 int type_len; 820 821 type = mdesc_get_property(hp, mp, "type", &type_len); 822 823 switch (*level) { 824 case 1: 825 if (of_find_in_proplist(type, "instn", type_len)) { 826 c->icache_size = *size; 827 c->icache_line_size = *line_size; 828 } else if (of_find_in_proplist(type, "data", type_len)) { 829 c->dcache_size = *size; 830 c->dcache_line_size = *line_size; 831 } 832 break; 833 834 case 2: 835 c->ecache_size = *size; 836 c->ecache_line_size = *line_size; 837 break; 838 839 default: 840 break; 841 } 842 843 if (*level == 1) { 844 u64 a; 845 846 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 847 u64 target = mdesc_arc_target(hp, a); 848 const char *name = mdesc_node_name(hp, target); 849 850 if (!strcmp(name, "cache")) 851 fill_in_one_cache(c, hp, target); 852 } 853 } 854 } 855 856 static void find_back_node_value(struct mdesc_handle *hp, u64 node, 857 char *srch_val, 858 void (*func)(struct mdesc_handle *, u64, int), 859 u64 val, int depth) 860 { 861 u64 arc; 862 863 /* Since we have an estimate of recursion depth, do a sanity check. */ 864 if (depth == 0) 865 return; 866 867 mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) { 868 u64 n = mdesc_arc_target(hp, arc); 869 const char *name = mdesc_node_name(hp, n); 870 871 if (!strcmp(srch_val, name)) 872 (*func)(hp, n, val); 873 874 find_back_node_value(hp, n, srch_val, func, val, depth-1); 875 } 876 } 877 878 static void __mark_core_id(struct mdesc_handle *hp, u64 node, 879 int core_id) 880 { 881 const u64 *id = mdesc_get_property(hp, node, "id", NULL); 882 883 if (*id < num_possible_cpus()) 884 cpu_data(*id).core_id = core_id; 885 } 886 887 static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node, 888 int max_cache_id) 889 { 890 const u64 *id = mdesc_get_property(hp, node, "id", NULL); 891 892 if (*id < num_possible_cpus()) { 893 cpu_data(*id).max_cache_id = max_cache_id; 894 895 /** 896 * On systems without explicit socket descriptions socket 897 * is max_cache_id 898 */ 899 cpu_data(*id).sock_id = max_cache_id; 900 } 901 } 902 903 static void mark_core_ids(struct mdesc_handle *hp, u64 mp, 904 int core_id) 905 { 906 find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10); 907 } 908 909 static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp, 910 int max_cache_id) 911 { 912 find_back_node_value(hp, mp, "cpu", __mark_max_cache_id, 913 max_cache_id, 10); 914 } 915 916 static void set_core_ids(struct mdesc_handle *hp) 917 { 918 int idx; 919 u64 mp; 920 921 idx = 1; 922 923 /* Identify unique cores by looking for cpus backpointed to by 924 * level 1 instruction caches. 925 */ 926 mdesc_for_each_node_by_name(hp, mp, "cache") { 927 const u64 *level; 928 const char *type; 929 int len; 930 931 level = mdesc_get_property(hp, mp, "level", NULL); 932 if (*level != 1) 933 continue; 934 935 type = mdesc_get_property(hp, mp, "type", &len); 936 if (!of_find_in_proplist(type, "instn", len)) 937 continue; 938 939 mark_core_ids(hp, mp, idx); 940 idx++; 941 } 942 } 943 944 static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level) 945 { 946 u64 mp; 947 int idx = 1; 948 int fnd = 0; 949 950 /** 951 * Identify unique highest level of shared cache by looking for cpus 952 * backpointed to by shared level N caches. 953 */ 954 mdesc_for_each_node_by_name(hp, mp, "cache") { 955 const u64 *cur_lvl; 956 957 cur_lvl = mdesc_get_property(hp, mp, "level", NULL); 958 if (*cur_lvl != level) 959 continue; 960 mark_max_cache_ids(hp, mp, idx); 961 idx++; 962 fnd = 1; 963 } 964 return fnd; 965 } 966 967 static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp) 968 { 969 int idx = 1; 970 971 mdesc_for_each_node_by_name(hp, mp, "socket") { 972 u64 a; 973 974 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 975 u64 t = mdesc_arc_target(hp, a); 976 const char *name; 977 const u64 *id; 978 979 name = mdesc_node_name(hp, t); 980 if (strcmp(name, "cpu")) 981 continue; 982 983 id = mdesc_get_property(hp, t, "id", NULL); 984 if (*id < num_possible_cpus()) 985 cpu_data(*id).sock_id = idx; 986 } 987 idx++; 988 } 989 } 990 991 static void set_sock_ids(struct mdesc_handle *hp) 992 { 993 u64 mp; 994 995 /** 996 * Find the highest level of shared cache which pre-T7 is also 997 * the socket. 998 */ 999 if (!set_max_cache_ids_by_cache(hp, 3)) 1000 set_max_cache_ids_by_cache(hp, 2); 1001 1002 /* If machine description exposes sockets data use it.*/ 1003 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets"); 1004 if (mp != MDESC_NODE_NULL) 1005 set_sock_ids_by_socket(hp, mp); 1006 } 1007 1008 static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id) 1009 { 1010 u64 a; 1011 1012 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 1013 u64 t = mdesc_arc_target(hp, a); 1014 const char *name; 1015 const u64 *id; 1016 1017 name = mdesc_node_name(hp, t); 1018 if (strcmp(name, "cpu")) 1019 continue; 1020 1021 id = mdesc_get_property(hp, t, "id", NULL); 1022 if (*id < NR_CPUS) 1023 cpu_data(*id).proc_id = proc_id; 1024 } 1025 } 1026 1027 static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name) 1028 { 1029 int idx; 1030 u64 mp; 1031 1032 idx = 0; 1033 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) { 1034 const char *type; 1035 int len; 1036 1037 type = mdesc_get_property(hp, mp, "type", &len); 1038 if (!of_find_in_proplist(type, "int", len) && 1039 !of_find_in_proplist(type, "integer", len)) 1040 continue; 1041 1042 mark_proc_ids(hp, mp, idx); 1043 idx++; 1044 } 1045 } 1046 1047 static void set_proc_ids(struct mdesc_handle *hp) 1048 { 1049 __set_proc_ids(hp, "exec_unit"); 1050 __set_proc_ids(hp, "exec-unit"); 1051 } 1052 1053 static void get_one_mondo_bits(const u64 *p, unsigned int *mask, 1054 unsigned long def, unsigned long max) 1055 { 1056 u64 val; 1057 1058 if (!p) 1059 goto use_default; 1060 val = *p; 1061 1062 if (!val || val >= 64) 1063 goto use_default; 1064 1065 if (val > max) 1066 val = max; 1067 1068 *mask = ((1U << val) * 64U) - 1U; 1069 return; 1070 1071 use_default: 1072 *mask = ((1U << def) * 64U) - 1U; 1073 } 1074 1075 static void get_mondo_data(struct mdesc_handle *hp, u64 mp, 1076 struct trap_per_cpu *tb) 1077 { 1078 static int printed; 1079 const u64 *val; 1080 1081 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL); 1082 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2)); 1083 1084 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL); 1085 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8); 1086 1087 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL); 1088 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7); 1089 1090 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL); 1091 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2); 1092 if (!printed++) { 1093 pr_info("SUN4V: Mondo queue sizes " 1094 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n", 1095 tb->cpu_mondo_qmask + 1, 1096 tb->dev_mondo_qmask + 1, 1097 tb->resum_qmask + 1, 1098 tb->nonresum_qmask + 1); 1099 } 1100 } 1101 1102 static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask) 1103 { 1104 struct mdesc_handle *hp = mdesc_grab(); 1105 void *ret = NULL; 1106 u64 mp; 1107 1108 mdesc_for_each_node_by_name(hp, mp, "cpu") { 1109 const u64 *id = mdesc_get_property(hp, mp, "id", NULL); 1110 int cpuid = *id; 1111 1112 #ifdef CONFIG_SMP 1113 if (cpuid >= NR_CPUS) { 1114 printk(KERN_WARNING "Ignoring CPU %d which is " 1115 ">= NR_CPUS (%d)\n", 1116 cpuid, NR_CPUS); 1117 continue; 1118 } 1119 if (!cpumask_test_cpu(cpuid, mask)) 1120 continue; 1121 #endif 1122 1123 ret = func(hp, mp, cpuid, arg); 1124 if (ret) 1125 goto out; 1126 } 1127 out: 1128 mdesc_release(hp); 1129 return ret; 1130 } 1131 1132 static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 1133 void *arg) 1134 { 1135 ncpus_probed++; 1136 #ifdef CONFIG_SMP 1137 set_cpu_present(cpuid, true); 1138 #endif 1139 return NULL; 1140 } 1141 1142 void mdesc_populate_present_mask(cpumask_t *mask) 1143 { 1144 if (tlb_type != hypervisor) 1145 return; 1146 1147 ncpus_probed = 0; 1148 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask); 1149 } 1150 1151 static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg) 1152 { 1153 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL); 1154 unsigned long *pgsz_mask = arg; 1155 u64 val; 1156 1157 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K | 1158 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB); 1159 if (pgsz_prop) 1160 val = *pgsz_prop; 1161 1162 if (!*pgsz_mask) 1163 *pgsz_mask = val; 1164 else 1165 *pgsz_mask &= val; 1166 return NULL; 1167 } 1168 1169 void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask) 1170 { 1171 *pgsz_mask = 0; 1172 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask); 1173 } 1174 1175 static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 1176 void *arg) 1177 { 1178 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL); 1179 struct trap_per_cpu *tb; 1180 cpuinfo_sparc *c; 1181 u64 a; 1182 1183 #ifndef CONFIG_SMP 1184 /* On uniprocessor we only want the values for the 1185 * real physical cpu the kernel booted onto, however 1186 * cpu_data() only has one entry at index 0. 1187 */ 1188 if (cpuid != real_hard_smp_processor_id()) 1189 return NULL; 1190 cpuid = 0; 1191 #endif 1192 1193 c = &cpu_data(cpuid); 1194 c->clock_tick = *cfreq; 1195 1196 tb = &trap_block[cpuid]; 1197 get_mondo_data(hp, mp, tb); 1198 1199 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 1200 u64 j, t = mdesc_arc_target(hp, a); 1201 const char *t_name; 1202 1203 t_name = mdesc_node_name(hp, t); 1204 if (!strcmp(t_name, "cache")) { 1205 fill_in_one_cache(c, hp, t); 1206 continue; 1207 } 1208 1209 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) { 1210 u64 n = mdesc_arc_target(hp, j); 1211 const char *n_name; 1212 1213 n_name = mdesc_node_name(hp, n); 1214 if (!strcmp(n_name, "cache")) 1215 fill_in_one_cache(c, hp, n); 1216 } 1217 } 1218 1219 c->core_id = 0; 1220 c->proc_id = -1; 1221 1222 return NULL; 1223 } 1224 1225 void mdesc_fill_in_cpu_data(cpumask_t *mask) 1226 { 1227 struct mdesc_handle *hp; 1228 1229 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask); 1230 1231 hp = mdesc_grab(); 1232 1233 set_core_ids(hp); 1234 set_proc_ids(hp); 1235 set_sock_ids(hp); 1236 1237 mdesc_release(hp); 1238 1239 smp_fill_in_sib_core_maps(); 1240 } 1241 1242 /* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is 1243 * opened. Hold this reference until /dev/mdesc is closed to ensure 1244 * mdesc data structure is not released underneath us. Store the 1245 * pointer to mdesc structure in private_data for read and seek to use 1246 */ 1247 static int mdesc_open(struct inode *inode, struct file *file) 1248 { 1249 struct mdesc_handle *hp = mdesc_grab(); 1250 1251 if (!hp) 1252 return -ENODEV; 1253 1254 file->private_data = hp; 1255 1256 return 0; 1257 } 1258 1259 static ssize_t mdesc_read(struct file *file, char __user *buf, 1260 size_t len, loff_t *offp) 1261 { 1262 struct mdesc_handle *hp = file->private_data; 1263 unsigned char *mdesc; 1264 int bytes_left, count = len; 1265 1266 if (*offp >= hp->handle_size) 1267 return 0; 1268 1269 bytes_left = hp->handle_size - *offp; 1270 if (count > bytes_left) 1271 count = bytes_left; 1272 1273 mdesc = (unsigned char *)&hp->mdesc; 1274 mdesc += *offp; 1275 if (!copy_to_user(buf, mdesc, count)) { 1276 *offp += count; 1277 return count; 1278 } else { 1279 return -EFAULT; 1280 } 1281 } 1282 1283 static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence) 1284 { 1285 struct mdesc_handle *hp = file->private_data; 1286 1287 return no_seek_end_llseek_size(file, offset, whence, hp->handle_size); 1288 } 1289 1290 /* mdesc_close() - /dev/mdesc is being closed, release the reference to 1291 * mdesc structure. 1292 */ 1293 static int mdesc_close(struct inode *inode, struct file *file) 1294 { 1295 mdesc_release(file->private_data); 1296 return 0; 1297 } 1298 1299 static const struct file_operations mdesc_fops = { 1300 .open = mdesc_open, 1301 .read = mdesc_read, 1302 .llseek = mdesc_llseek, 1303 .release = mdesc_close, 1304 .owner = THIS_MODULE, 1305 }; 1306 1307 static struct miscdevice mdesc_misc = { 1308 .minor = MISC_DYNAMIC_MINOR, 1309 .name = "mdesc", 1310 .fops = &mdesc_fops, 1311 }; 1312 1313 static int __init mdesc_misc_init(void) 1314 { 1315 return misc_register(&mdesc_misc); 1316 } 1317 1318 __initcall(mdesc_misc_init); 1319 1320 void __init sun4v_mdesc_init(void) 1321 { 1322 struct mdesc_handle *hp; 1323 unsigned long len, real_len, status; 1324 1325 (void) sun4v_mach_desc(0UL, 0UL, &len); 1326 1327 printk("MDESC: Size is %lu bytes.\n", len); 1328 1329 hp = mdesc_alloc(len, &memblock_mdesc_ops); 1330 if (hp == NULL) { 1331 prom_printf("MDESC: alloc of %lu bytes failed.\n", len); 1332 prom_halt(); 1333 } 1334 1335 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 1336 if (status != HV_EOK || real_len > len) { 1337 prom_printf("sun4v_mach_desc fails, err(%lu), " 1338 "len(%lu), real_len(%lu)\n", 1339 status, len, real_len); 1340 mdesc_free(hp); 1341 prom_halt(); 1342 } 1343 1344 cur_mdesc = hp; 1345 1346 report_platform_properties(); 1347 } 1348