1// SPDX-License-Identifier: GPL-2.0 2/* mdesc.c: Sun4V machine description handling. 3 * 4 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> 5 */ 6#include <linux/kernel.h> 7#include <linux/types.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/memblock.h> 14#include <linux/export.h> 15#include <linux/refcount.h> 16 17#include <asm/cpudata.h> 18#include <asm/hypervisor.h> 19#include <asm/mdesc.h> 20#include <asm/prom.h> 21#include <linux/uaccess.h> 22#include <asm/oplib.h> 23#include <asm/smp.h> 24#include <asm/adi.h> 25 26/* Unlike the OBP device tree, the machine description is a full-on 27 * DAG. An arbitrary number of ARCs are possible from one 28 * node to other nodes and thus we can't use the OBP device_node 29 * data structure to represent these nodes inside of the kernel. 30 * 31 * Actually, it isn't even a DAG, because there are back pointers 32 * which create cycles in the graph. 33 * 34 * mdesc_hdr and mdesc_elem describe the layout of the data structure 35 * we get from the Hypervisor. 36 */ 37struct mdesc_hdr { 38 u32 version; /* Transport version */ 39 u32 node_sz; /* node block size */ 40 u32 name_sz; /* name block size */ 41 u32 data_sz; /* data block size */ 42 char data[]; 43} __attribute__((aligned(16))); 44 45struct mdesc_elem { 46 u8 tag; 47#define MD_LIST_END 0x00 48#define MD_NODE 0x4e 49#define MD_NODE_END 0x45 50#define MD_NOOP 0x20 51#define MD_PROP_ARC 0x61 52#define MD_PROP_VAL 0x76 53#define MD_PROP_STR 0x73 54#define MD_PROP_DATA 0x64 55 u8 name_len; 56 u16 resv; 57 u32 name_offset; 58 union { 59 struct { 60 u32 data_len; 61 u32 data_offset; 62 } data; 63 u64 val; 64 } d; 65}; 66 67struct mdesc_mem_ops { 68 struct mdesc_handle *(*alloc)(unsigned int mdesc_size); 69 void (*free)(struct mdesc_handle *handle); 70}; 71 72struct mdesc_handle { 73 struct list_head list; 74 struct mdesc_mem_ops *mops; 75 void *self_base; 76 refcount_t refcnt; 77 unsigned int handle_size; 78 struct mdesc_hdr mdesc; 79}; 80 81typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64, 82 union md_node_info *); 83typedef void (*mdesc_node_info_rel_f)(union md_node_info *); 84typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *); 85 86struct md_node_ops { 87 char *name; 88 mdesc_node_info_get_f get_info; 89 mdesc_node_info_rel_f rel_info; 90 mdesc_node_match_f node_match; 91}; 92 93static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node, 94 union md_node_info *node_info); 95static void rel_vdev_port_node_info(union md_node_info *node_info); 96static bool vdev_port_node_match(union md_node_info *a_node_info, 97 union md_node_info *b_node_info); 98 99static int get_ds_port_node_info(struct mdesc_handle *md, u64 node, 100 union md_node_info *node_info); 101static void rel_ds_port_node_info(union md_node_info *node_info); 102static bool ds_port_node_match(union md_node_info *a_node_info, 103 union md_node_info *b_node_info); 104 105/* supported node types which can be registered */ 106static struct md_node_ops md_node_ops_table[] = { 107 {"virtual-device-port", get_vdev_port_node_info, 108 rel_vdev_port_node_info, vdev_port_node_match}, 109 {"domain-services-port", get_ds_port_node_info, 110 rel_ds_port_node_info, ds_port_node_match}, 111 {NULL, NULL, NULL, NULL} 112}; 113 114static void mdesc_get_node_ops(const char *node_name, 115 mdesc_node_info_get_f *get_info_f, 116 mdesc_node_info_rel_f *rel_info_f, 117 mdesc_node_match_f *match_f) 118{ 119 int i; 120 121 if (get_info_f) 122 *get_info_f = NULL; 123 124 if (rel_info_f) 125 *rel_info_f = NULL; 126 127 if (match_f) 128 *match_f = NULL; 129 130 if (!node_name) 131 return; 132 133 for (i = 0; md_node_ops_table[i].name != NULL; i++) { 134 if (strcmp(md_node_ops_table[i].name, node_name) == 0) { 135 if (get_info_f) 136 *get_info_f = md_node_ops_table[i].get_info; 137 138 if (rel_info_f) 139 *rel_info_f = md_node_ops_table[i].rel_info; 140 141 if (match_f) 142 *match_f = md_node_ops_table[i].node_match; 143 144 break; 145 } 146 } 147} 148 149static void mdesc_handle_init(struct mdesc_handle *hp, 150 unsigned int handle_size, 151 void *base) 152{ 153 BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1)); 154 155 memset(hp, 0, handle_size); 156 INIT_LIST_HEAD(&hp->list); 157 hp->self_base = base; 158 refcount_set(&hp->refcnt, 1); 159 hp->handle_size = handle_size; 160} 161 162static struct mdesc_handle * __init mdesc_memblock_alloc(unsigned int mdesc_size) 163{ 164 unsigned int handle_size, alloc_size; 165 struct mdesc_handle *hp; 166 unsigned long paddr; 167 168 handle_size = (sizeof(struct mdesc_handle) - 169 sizeof(struct mdesc_hdr) + 170 mdesc_size); 171 alloc_size = PAGE_ALIGN(handle_size); 172 173 paddr = memblock_phys_alloc(alloc_size, PAGE_SIZE); 174 175 hp = NULL; 176 if (paddr) { 177 hp = __va(paddr); 178 mdesc_handle_init(hp, handle_size, hp); 179 } 180 return hp; 181} 182 183static void __init mdesc_memblock_free(struct mdesc_handle *hp) 184{ 185 unsigned int alloc_size; 186 unsigned long start; 187 188 BUG_ON(refcount_read(&hp->refcnt) != 0); 189 BUG_ON(!list_empty(&hp->list)); 190 191 alloc_size = PAGE_ALIGN(hp->handle_size); 192 start = __pa(hp); 193 memblock_free_late(start, alloc_size); 194} 195 196static struct mdesc_mem_ops memblock_mdesc_ops = { 197 .alloc = mdesc_memblock_alloc, 198 .free = mdesc_memblock_free, 199}; 200 201static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size) 202{ 203 unsigned int handle_size; 204 struct mdesc_handle *hp; 205 unsigned long addr; 206 void *base; 207 208 handle_size = (sizeof(struct mdesc_handle) - 209 sizeof(struct mdesc_hdr) + 210 mdesc_size); 211 base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_RETRY_MAYFAIL); 212 if (!base) 213 return NULL; 214 215 addr = (unsigned long)base; 216 addr = (addr + 15UL) & ~15UL; 217 hp = (struct mdesc_handle *) addr; 218 219 mdesc_handle_init(hp, handle_size, base); 220 221 return hp; 222} 223 224static void mdesc_kfree(struct mdesc_handle *hp) 225{ 226 BUG_ON(refcount_read(&hp->refcnt) != 0); 227 BUG_ON(!list_empty(&hp->list)); 228 229 kfree(hp->self_base); 230} 231 232static struct mdesc_mem_ops kmalloc_mdesc_memops = { 233 .alloc = mdesc_kmalloc, 234 .free = mdesc_kfree, 235}; 236 237static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size, 238 struct mdesc_mem_ops *mops) 239{ 240 struct mdesc_handle *hp = mops->alloc(mdesc_size); 241 242 if (hp) 243 hp->mops = mops; 244 245 return hp; 246} 247 248static void mdesc_free(struct mdesc_handle *hp) 249{ 250 hp->mops->free(hp); 251} 252 253static struct mdesc_handle *cur_mdesc; 254static LIST_HEAD(mdesc_zombie_list); 255static DEFINE_SPINLOCK(mdesc_lock); 256 257struct mdesc_handle *mdesc_grab(void) 258{ 259 struct mdesc_handle *hp; 260 unsigned long flags; 261 262 spin_lock_irqsave(&mdesc_lock, flags); 263 hp = cur_mdesc; 264 if (hp) 265 refcount_inc(&hp->refcnt); 266 spin_unlock_irqrestore(&mdesc_lock, flags); 267 268 return hp; 269} 270EXPORT_SYMBOL(mdesc_grab); 271 272void mdesc_release(struct mdesc_handle *hp) 273{ 274 unsigned long flags; 275 276 spin_lock_irqsave(&mdesc_lock, flags); 277 if (refcount_dec_and_test(&hp->refcnt)) { 278 list_del_init(&hp->list); 279 hp->mops->free(hp); 280 } 281 spin_unlock_irqrestore(&mdesc_lock, flags); 282} 283EXPORT_SYMBOL(mdesc_release); 284 285static DEFINE_MUTEX(mdesc_mutex); 286static struct mdesc_notifier_client *client_list; 287 288void mdesc_register_notifier(struct mdesc_notifier_client *client) 289{ 290 bool supported = false; 291 u64 node; 292 int i; 293 294 mutex_lock(&mdesc_mutex); 295 296 /* check to see if the node is supported for registration */ 297 for (i = 0; md_node_ops_table[i].name != NULL; i++) { 298 if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) { 299 supported = true; 300 break; 301 } 302 } 303 304 if (!supported) { 305 pr_err("MD: %s node not supported\n", client->node_name); 306 mutex_unlock(&mdesc_mutex); 307 return; 308 } 309 310 client->next = client_list; 311 client_list = client; 312 313 mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name) 314 client->add(cur_mdesc, node, client->node_name); 315 316 mutex_unlock(&mdesc_mutex); 317} 318 319static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node) 320{ 321 const u64 *id; 322 u64 a; 323 324 id = NULL; 325 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { 326 u64 target; 327 328 target = mdesc_arc_target(hp, a); 329 id = mdesc_get_property(hp, target, 330 "cfg-handle", NULL); 331 if (id) 332 break; 333 } 334 335 return id; 336} 337 338static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node, 339 union md_node_info *node_info) 340{ 341 const u64 *parent_cfg_hdlp; 342 const char *name; 343 const u64 *idp; 344 345 /* 346 * Virtual device nodes are distinguished by: 347 * 1. "id" property 348 * 2. "name" property 349 * 3. parent node "cfg-handle" property 350 */ 351 idp = mdesc_get_property(md, node, "id", NULL); 352 name = mdesc_get_property(md, node, "name", NULL); 353 parent_cfg_hdlp = parent_cfg_handle(md, node); 354 355 if (!idp || !name || !parent_cfg_hdlp) 356 return -1; 357 358 node_info->vdev_port.id = *idp; 359 node_info->vdev_port.name = kstrdup_const(name, GFP_KERNEL); 360 if (!node_info->vdev_port.name) 361 return -1; 362 node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp; 363 364 return 0; 365} 366 367static void rel_vdev_port_node_info(union md_node_info *node_info) 368{ 369 if (node_info && node_info->vdev_port.name) { 370 kfree_const(node_info->vdev_port.name); 371 node_info->vdev_port.name = NULL; 372 } 373} 374 375static bool vdev_port_node_match(union md_node_info *a_node_info, 376 union md_node_info *b_node_info) 377{ 378 if (a_node_info->vdev_port.id != b_node_info->vdev_port.id) 379 return false; 380 381 if (a_node_info->vdev_port.parent_cfg_hdl != 382 b_node_info->vdev_port.parent_cfg_hdl) 383 return false; 384 385 if (strncmp(a_node_info->vdev_port.name, 386 b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0) 387 return false; 388 389 return true; 390} 391 392static int get_ds_port_node_info(struct mdesc_handle *md, u64 node, 393 union md_node_info *node_info) 394{ 395 const u64 *idp; 396 397 /* DS port nodes use the "id" property to distinguish them */ 398 idp = mdesc_get_property(md, node, "id", NULL); 399 if (!idp) 400 return -1; 401 402 node_info->ds_port.id = *idp; 403 404 return 0; 405} 406 407static void rel_ds_port_node_info(union md_node_info *node_info) 408{ 409} 410 411static bool ds_port_node_match(union md_node_info *a_node_info, 412 union md_node_info *b_node_info) 413{ 414 if (a_node_info->ds_port.id != b_node_info->ds_port.id) 415 return false; 416 417 return true; 418} 419 420/* Run 'func' on nodes which are in A but not in B. */ 421static void invoke_on_missing(const char *name, 422 struct mdesc_handle *a, 423 struct mdesc_handle *b, 424 void (*func)(struct mdesc_handle *, u64, 425 const char *node_name)) 426{ 427 mdesc_node_info_get_f get_info_func; 428 mdesc_node_info_rel_f rel_info_func; 429 mdesc_node_match_f node_match_func; 430 union md_node_info a_node_info; 431 union md_node_info b_node_info; 432 bool found; 433 u64 a_node; 434 u64 b_node; 435 int rv; 436 437 /* 438 * Find the get_info, rel_info and node_match ops for the given 439 * node name 440 */ 441 mdesc_get_node_ops(name, &get_info_func, &rel_info_func, 442 &node_match_func); 443 444 /* If we didn't find a match, the node type is not supported */ 445 if (!get_info_func || !rel_info_func || !node_match_func) { 446 pr_err("MD: %s node type is not supported\n", name); 447 return; 448 } 449 450 mdesc_for_each_node_by_name(a, a_node, name) { 451 found = false; 452 453 rv = get_info_func(a, a_node, &a_node_info); 454 if (rv != 0) { 455 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n", 456 name); 457 continue; 458 } 459 460 /* Check each node in B for node matching a_node */ 461 mdesc_for_each_node_by_name(b, b_node, name) { 462 rv = get_info_func(b, b_node, &b_node_info); 463 if (rv != 0) 464 continue; 465 466 if (node_match_func(&a_node_info, &b_node_info)) { 467 found = true; 468 rel_info_func(&b_node_info); 469 break; 470 } 471 472 rel_info_func(&b_node_info); 473 } 474 475 rel_info_func(&a_node_info); 476 477 if (!found) 478 func(a, a_node, name); 479 } 480} 481 482static void notify_one(struct mdesc_notifier_client *p, 483 struct mdesc_handle *old_hp, 484 struct mdesc_handle *new_hp) 485{ 486 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove); 487 invoke_on_missing(p->node_name, new_hp, old_hp, p->add); 488} 489 490static void mdesc_notify_clients(struct mdesc_handle *old_hp, 491 struct mdesc_handle *new_hp) 492{ 493 struct mdesc_notifier_client *p = client_list; 494 495 while (p) { 496 notify_one(p, old_hp, new_hp); 497 p = p->next; 498 } 499} 500 501void mdesc_update(void) 502{ 503 unsigned long len, real_len, status; 504 struct mdesc_handle *hp, *orig_hp; 505 unsigned long flags; 506 507 mutex_lock(&mdesc_mutex); 508 509 (void) sun4v_mach_desc(0UL, 0UL, &len); 510 511 hp = mdesc_alloc(len, &kmalloc_mdesc_memops); 512 if (!hp) { 513 printk(KERN_ERR "MD: mdesc alloc fails\n"); 514 goto out; 515 } 516 517 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 518 if (status != HV_EOK || real_len > len) { 519 printk(KERN_ERR "MD: mdesc reread fails with %lu\n", 520 status); 521 refcount_dec(&hp->refcnt); 522 mdesc_free(hp); 523 goto out; 524 } 525 526 spin_lock_irqsave(&mdesc_lock, flags); 527 orig_hp = cur_mdesc; 528 cur_mdesc = hp; 529 spin_unlock_irqrestore(&mdesc_lock, flags); 530 531 mdesc_notify_clients(orig_hp, hp); 532 533 spin_lock_irqsave(&mdesc_lock, flags); 534 if (refcount_dec_and_test(&orig_hp->refcnt)) 535 mdesc_free(orig_hp); 536 else 537 list_add(&orig_hp->list, &mdesc_zombie_list); 538 spin_unlock_irqrestore(&mdesc_lock, flags); 539 540out: 541 mutex_unlock(&mdesc_mutex); 542} 543 544u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name, 545 union md_node_info *node_info) 546{ 547 mdesc_node_info_get_f get_info_func; 548 mdesc_node_info_rel_f rel_info_func; 549 mdesc_node_match_f node_match_func; 550 union md_node_info hp_node_info; 551 u64 hp_node; 552 int rv; 553 554 if (hp == NULL || node_name == NULL || node_info == NULL) 555 return MDESC_NODE_NULL; 556 557 /* Find the ops for the given node name */ 558 mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func, 559 &node_match_func); 560 561 /* If we didn't find ops for the given node name, it is not supported */ 562 if (!get_info_func || !rel_info_func || !node_match_func) { 563 pr_err("MD: %s node is not supported\n", node_name); 564 return -EINVAL; 565 } 566 567 mdesc_for_each_node_by_name(hp, hp_node, node_name) { 568 rv = get_info_func(hp, hp_node, &hp_node_info); 569 if (rv != 0) 570 continue; 571 572 if (node_match_func(node_info, &hp_node_info)) 573 break; 574 575 rel_info_func(&hp_node_info); 576 } 577 578 rel_info_func(&hp_node_info); 579 580 return hp_node; 581} 582EXPORT_SYMBOL(mdesc_get_node); 583 584int mdesc_get_node_info(struct mdesc_handle *hp, u64 node, 585 const char *node_name, union md_node_info *node_info) 586{ 587 mdesc_node_info_get_f get_info_func; 588 int rv; 589 590 if (hp == NULL || node == MDESC_NODE_NULL || 591 node_name == NULL || node_info == NULL) 592 return -EINVAL; 593 594 /* Find the get_info op for the given node name */ 595 mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL); 596 597 /* If we didn't find a get_info_func, the node name is not supported */ 598 if (get_info_func == NULL) { 599 pr_err("MD: %s node is not supported\n", node_name); 600 return -EINVAL; 601 } 602 603 rv = get_info_func(hp, node, node_info); 604 if (rv != 0) { 605 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n", 606 node_name); 607 return -1; 608 } 609 610 return 0; 611} 612EXPORT_SYMBOL(mdesc_get_node_info); 613 614static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc) 615{ 616 return (struct mdesc_elem *) mdesc->data; 617} 618 619static void *name_block(struct mdesc_hdr *mdesc) 620{ 621 return ((void *) node_block(mdesc)) + mdesc->node_sz; 622} 623 624static void *data_block(struct mdesc_hdr *mdesc) 625{ 626 return ((void *) name_block(mdesc)) + mdesc->name_sz; 627} 628 629u64 mdesc_node_by_name(struct mdesc_handle *hp, 630 u64 from_node, const char *name) 631{ 632 struct mdesc_elem *ep = node_block(&hp->mdesc); 633 const char *names = name_block(&hp->mdesc); 634 u64 last_node = hp->mdesc.node_sz / 16; 635 u64 ret; 636 637 if (from_node == MDESC_NODE_NULL) { 638 ret = from_node = 0; 639 } else if (from_node >= last_node) { 640 return MDESC_NODE_NULL; 641 } else { 642 ret = ep[from_node].d.val; 643 } 644 645 while (ret < last_node) { 646 if (ep[ret].tag != MD_NODE) 647 return MDESC_NODE_NULL; 648 if (!strcmp(names + ep[ret].name_offset, name)) 649 break; 650 ret = ep[ret].d.val; 651 } 652 if (ret >= last_node) 653 ret = MDESC_NODE_NULL; 654 return ret; 655} 656EXPORT_SYMBOL(mdesc_node_by_name); 657 658const void *mdesc_get_property(struct mdesc_handle *hp, u64 node, 659 const char *name, int *lenp) 660{ 661 const char *names = name_block(&hp->mdesc); 662 u64 last_node = hp->mdesc.node_sz / 16; 663 void *data = data_block(&hp->mdesc); 664 struct mdesc_elem *ep; 665 666 if (node == MDESC_NODE_NULL || node >= last_node) 667 return NULL; 668 669 ep = node_block(&hp->mdesc) + node; 670 ep++; 671 for (; ep->tag != MD_NODE_END; ep++) { 672 void *val = NULL; 673 int len = 0; 674 675 switch (ep->tag) { 676 case MD_PROP_VAL: 677 val = &ep->d.val; 678 len = 8; 679 break; 680 681 case MD_PROP_STR: 682 case MD_PROP_DATA: 683 val = data + ep->d.data.data_offset; 684 len = ep->d.data.data_len; 685 break; 686 687 default: 688 break; 689 } 690 if (!val) 691 continue; 692 693 if (!strcmp(names + ep->name_offset, name)) { 694 if (lenp) 695 *lenp = len; 696 return val; 697 } 698 } 699 700 return NULL; 701} 702EXPORT_SYMBOL(mdesc_get_property); 703 704u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type) 705{ 706 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 707 const char *names = name_block(&hp->mdesc); 708 u64 last_node = hp->mdesc.node_sz / 16; 709 710 if (from == MDESC_NODE_NULL || from >= last_node) 711 return MDESC_NODE_NULL; 712 713 ep = base + from; 714 715 ep++; 716 for (; ep->tag != MD_NODE_END; ep++) { 717 if (ep->tag != MD_PROP_ARC) 718 continue; 719 720 if (strcmp(names + ep->name_offset, arc_type)) 721 continue; 722 723 return ep - base; 724 } 725 726 return MDESC_NODE_NULL; 727} 728EXPORT_SYMBOL(mdesc_next_arc); 729 730u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc) 731{ 732 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 733 734 ep = base + arc; 735 736 return ep->d.val; 737} 738EXPORT_SYMBOL(mdesc_arc_target); 739 740const char *mdesc_node_name(struct mdesc_handle *hp, u64 node) 741{ 742 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 743 const char *names = name_block(&hp->mdesc); 744 u64 last_node = hp->mdesc.node_sz / 16; 745 746 if (node == MDESC_NODE_NULL || node >= last_node) 747 return NULL; 748 749 ep = base + node; 750 if (ep->tag != MD_NODE) 751 return NULL; 752 753 return names + ep->name_offset; 754} 755EXPORT_SYMBOL(mdesc_node_name); 756 757static u64 max_cpus = 64; 758 759static void __init report_platform_properties(void) 760{ 761 struct mdesc_handle *hp = mdesc_grab(); 762 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); 763 const char *s; 764 const u64 *v; 765 766 if (pn == MDESC_NODE_NULL) { 767 prom_printf("No platform node in machine-description.\n"); 768 prom_halt(); 769 } 770 771 s = mdesc_get_property(hp, pn, "banner-name", NULL); 772 printk("PLATFORM: banner-name [%s]\n", s); 773 s = mdesc_get_property(hp, pn, "name", NULL); 774 printk("PLATFORM: name [%s]\n", s); 775 776 v = mdesc_get_property(hp, pn, "hostid", NULL); 777 if (v) 778 printk("PLATFORM: hostid [%08llx]\n", *v); 779 v = mdesc_get_property(hp, pn, "serial#", NULL); 780 if (v) 781 printk("PLATFORM: serial# [%08llx]\n", *v); 782 v = mdesc_get_property(hp, pn, "stick-frequency", NULL); 783 printk("PLATFORM: stick-frequency [%08llx]\n", *v); 784 v = mdesc_get_property(hp, pn, "mac-address", NULL); 785 if (v) 786 printk("PLATFORM: mac-address [%llx]\n", *v); 787 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL); 788 if (v) 789 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v); 790 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL); 791 if (v) 792 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v); 793 v = mdesc_get_property(hp, pn, "max-cpus", NULL); 794 if (v) { 795 max_cpus = *v; 796 printk("PLATFORM: max-cpus [%llu]\n", max_cpus); 797 } 798 799#ifdef CONFIG_SMP 800 { 801 int max_cpu, i; 802 803 if (v) { 804 max_cpu = *v; 805 if (max_cpu > NR_CPUS) 806 max_cpu = NR_CPUS; 807 } else { 808 max_cpu = NR_CPUS; 809 } 810 for (i = 0; i < max_cpu; i++) 811 set_cpu_possible(i, true); 812 } 813#endif 814 815 mdesc_release(hp); 816} 817 818static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp) 819{ 820 const u64 *level = mdesc_get_property(hp, mp, "level", NULL); 821 const u64 *size = mdesc_get_property(hp, mp, "size", NULL); 822 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL); 823 const char *type; 824 int type_len; 825 826 type = mdesc_get_property(hp, mp, "type", &type_len); 827 828 switch (*level) { 829 case 1: 830 if (of_find_in_proplist(type, "instn", type_len)) { 831 c->icache_size = *size; 832 c->icache_line_size = *line_size; 833 } else if (of_find_in_proplist(type, "data", type_len)) { 834 c->dcache_size = *size; 835 c->dcache_line_size = *line_size; 836 } 837 break; 838 839 case 2: 840 c->ecache_size = *size; 841 c->ecache_line_size = *line_size; 842 break; 843 844 default: 845 break; 846 } 847 848 if (*level == 1) { 849 u64 a; 850 851 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 852 u64 target = mdesc_arc_target(hp, a); 853 const char *name = mdesc_node_name(hp, target); 854 855 if (!strcmp(name, "cache")) 856 fill_in_one_cache(c, hp, target); 857 } 858 } 859} 860 861static void find_back_node_value(struct mdesc_handle *hp, u64 node, 862 char *srch_val, 863 void (*func)(struct mdesc_handle *, u64, int), 864 u64 val, int depth) 865{ 866 u64 arc; 867 868 /* Since we have an estimate of recursion depth, do a sanity check. */ 869 if (depth == 0) 870 return; 871 872 mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) { 873 u64 n = mdesc_arc_target(hp, arc); 874 const char *name = mdesc_node_name(hp, n); 875 876 if (!strcmp(srch_val, name)) 877 (*func)(hp, n, val); 878 879 find_back_node_value(hp, n, srch_val, func, val, depth-1); 880 } 881} 882 883static void __mark_core_id(struct mdesc_handle *hp, u64 node, 884 int core_id) 885{ 886 const u64 *id = mdesc_get_property(hp, node, "id", NULL); 887 888 if (*id < num_possible_cpus()) 889 cpu_data(*id).core_id = core_id; 890} 891 892static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node, 893 int max_cache_id) 894{ 895 const u64 *id = mdesc_get_property(hp, node, "id", NULL); 896 897 if (*id < num_possible_cpus()) { 898 cpu_data(*id).max_cache_id = max_cache_id; 899 900 /** 901 * On systems without explicit socket descriptions socket 902 * is max_cache_id 903 */ 904 cpu_data(*id).sock_id = max_cache_id; 905 } 906} 907 908static void mark_core_ids(struct mdesc_handle *hp, u64 mp, 909 int core_id) 910{ 911 find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10); 912} 913 914static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp, 915 int max_cache_id) 916{ 917 find_back_node_value(hp, mp, "cpu", __mark_max_cache_id, 918 max_cache_id, 10); 919} 920 921static void set_core_ids(struct mdesc_handle *hp) 922{ 923 int idx; 924 u64 mp; 925 926 idx = 1; 927 928 /* Identify unique cores by looking for cpus backpointed to by 929 * level 1 instruction caches. 930 */ 931 mdesc_for_each_node_by_name(hp, mp, "cache") { 932 const u64 *level; 933 const char *type; 934 int len; 935 936 level = mdesc_get_property(hp, mp, "level", NULL); 937 if (*level != 1) 938 continue; 939 940 type = mdesc_get_property(hp, mp, "type", &len); 941 if (!of_find_in_proplist(type, "instn", len)) 942 continue; 943 944 mark_core_ids(hp, mp, idx); 945 idx++; 946 } 947} 948 949static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level) 950{ 951 u64 mp; 952 int idx = 1; 953 int fnd = 0; 954 955 /** 956 * Identify unique highest level of shared cache by looking for cpus 957 * backpointed to by shared level N caches. 958 */ 959 mdesc_for_each_node_by_name(hp, mp, "cache") { 960 const u64 *cur_lvl; 961 962 cur_lvl = mdesc_get_property(hp, mp, "level", NULL); 963 if (*cur_lvl != level) 964 continue; 965 mark_max_cache_ids(hp, mp, idx); 966 idx++; 967 fnd = 1; 968 } 969 return fnd; 970} 971 972static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp) 973{ 974 int idx = 1; 975 976 mdesc_for_each_node_by_name(hp, mp, "socket") { 977 u64 a; 978 979 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 980 u64 t = mdesc_arc_target(hp, a); 981 const char *name; 982 const u64 *id; 983 984 name = mdesc_node_name(hp, t); 985 if (strcmp(name, "cpu")) 986 continue; 987 988 id = mdesc_get_property(hp, t, "id", NULL); 989 if (*id < num_possible_cpus()) 990 cpu_data(*id).sock_id = idx; 991 } 992 idx++; 993 } 994} 995 996static void set_sock_ids(struct mdesc_handle *hp) 997{ 998 u64 mp; 999 1000 /** 1001 * Find the highest level of shared cache which pre-T7 is also 1002 * the socket. 1003 */ 1004 if (!set_max_cache_ids_by_cache(hp, 3)) 1005 set_max_cache_ids_by_cache(hp, 2); 1006 1007 /* If machine description exposes sockets data use it.*/ 1008 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets"); 1009 if (mp != MDESC_NODE_NULL) 1010 set_sock_ids_by_socket(hp, mp); 1011} 1012 1013static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id) 1014{ 1015 u64 a; 1016 1017 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 1018 u64 t = mdesc_arc_target(hp, a); 1019 const char *name; 1020 const u64 *id; 1021 1022 name = mdesc_node_name(hp, t); 1023 if (strcmp(name, "cpu")) 1024 continue; 1025 1026 id = mdesc_get_property(hp, t, "id", NULL); 1027 if (*id < NR_CPUS) 1028 cpu_data(*id).proc_id = proc_id; 1029 } 1030} 1031 1032static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name) 1033{ 1034 int idx; 1035 u64 mp; 1036 1037 idx = 0; 1038 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) { 1039 const char *type; 1040 int len; 1041 1042 type = mdesc_get_property(hp, mp, "type", &len); 1043 if (!of_find_in_proplist(type, "int", len) && 1044 !of_find_in_proplist(type, "integer", len)) 1045 continue; 1046 1047 mark_proc_ids(hp, mp, idx); 1048 idx++; 1049 } 1050} 1051 1052static void set_proc_ids(struct mdesc_handle *hp) 1053{ 1054 __set_proc_ids(hp, "exec_unit"); 1055 __set_proc_ids(hp, "exec-unit"); 1056} 1057 1058static void get_one_mondo_bits(const u64 *p, unsigned int *mask, 1059 unsigned long def, unsigned long max) 1060{ 1061 u64 val; 1062 1063 if (!p) 1064 goto use_default; 1065 val = *p; 1066 1067 if (!val || val >= 64) 1068 goto use_default; 1069 1070 if (val > max) 1071 val = max; 1072 1073 *mask = ((1U << val) * 64U) - 1U; 1074 return; 1075 1076use_default: 1077 *mask = ((1U << def) * 64U) - 1U; 1078} 1079 1080static void get_mondo_data(struct mdesc_handle *hp, u64 mp, 1081 struct trap_per_cpu *tb) 1082{ 1083 static int printed; 1084 const u64 *val; 1085 1086 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL); 1087 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2)); 1088 1089 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL); 1090 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8); 1091 1092 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL); 1093 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7); 1094 1095 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL); 1096 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2); 1097 if (!printed++) { 1098 pr_info("SUN4V: Mondo queue sizes " 1099 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n", 1100 tb->cpu_mondo_qmask + 1, 1101 tb->dev_mondo_qmask + 1, 1102 tb->resum_qmask + 1, 1103 tb->nonresum_qmask + 1); 1104 } 1105} 1106 1107static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask) 1108{ 1109 struct mdesc_handle *hp = mdesc_grab(); 1110 void *ret = NULL; 1111 u64 mp; 1112 1113 mdesc_for_each_node_by_name(hp, mp, "cpu") { 1114 const u64 *id = mdesc_get_property(hp, mp, "id", NULL); 1115 int cpuid = *id; 1116 1117#ifdef CONFIG_SMP 1118 if (cpuid >= NR_CPUS) { 1119 printk(KERN_WARNING "Ignoring CPU %d which is " 1120 ">= NR_CPUS (%d)\n", 1121 cpuid, NR_CPUS); 1122 continue; 1123 } 1124 if (!cpumask_test_cpu(cpuid, mask)) 1125 continue; 1126#endif 1127 1128 ret = func(hp, mp, cpuid, arg); 1129 if (ret) 1130 goto out; 1131 } 1132out: 1133 mdesc_release(hp); 1134 return ret; 1135} 1136 1137static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 1138 void *arg) 1139{ 1140 ncpus_probed++; 1141#ifdef CONFIG_SMP 1142 set_cpu_present(cpuid, true); 1143#endif 1144 return NULL; 1145} 1146 1147void mdesc_populate_present_mask(cpumask_t *mask) 1148{ 1149 if (tlb_type != hypervisor) 1150 return; 1151 1152 ncpus_probed = 0; 1153 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask); 1154} 1155 1156static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg) 1157{ 1158 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL); 1159 unsigned long *pgsz_mask = arg; 1160 u64 val; 1161 1162 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K | 1163 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB); 1164 if (pgsz_prop) 1165 val = *pgsz_prop; 1166 1167 if (!*pgsz_mask) 1168 *pgsz_mask = val; 1169 else 1170 *pgsz_mask &= val; 1171 return NULL; 1172} 1173 1174void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask) 1175{ 1176 *pgsz_mask = 0; 1177 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask); 1178} 1179 1180static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 1181 void *arg) 1182{ 1183 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL); 1184 struct trap_per_cpu *tb; 1185 cpuinfo_sparc *c; 1186 u64 a; 1187 1188#ifndef CONFIG_SMP 1189 /* On uniprocessor we only want the values for the 1190 * real physical cpu the kernel booted onto, however 1191 * cpu_data() only has one entry at index 0. 1192 */ 1193 if (cpuid != real_hard_smp_processor_id()) 1194 return NULL; 1195 cpuid = 0; 1196#endif 1197 1198 c = &cpu_data(cpuid); 1199 c->clock_tick = *cfreq; 1200 1201 tb = &trap_block[cpuid]; 1202 get_mondo_data(hp, mp, tb); 1203 1204 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 1205 u64 j, t = mdesc_arc_target(hp, a); 1206 const char *t_name; 1207 1208 t_name = mdesc_node_name(hp, t); 1209 if (!strcmp(t_name, "cache")) { 1210 fill_in_one_cache(c, hp, t); 1211 continue; 1212 } 1213 1214 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) { 1215 u64 n = mdesc_arc_target(hp, j); 1216 const char *n_name; 1217 1218 n_name = mdesc_node_name(hp, n); 1219 if (!strcmp(n_name, "cache")) 1220 fill_in_one_cache(c, hp, n); 1221 } 1222 } 1223 1224 c->core_id = 0; 1225 c->proc_id = -1; 1226 1227 return NULL; 1228} 1229 1230void mdesc_fill_in_cpu_data(cpumask_t *mask) 1231{ 1232 struct mdesc_handle *hp; 1233 1234 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask); 1235 1236 hp = mdesc_grab(); 1237 1238 set_core_ids(hp); 1239 set_proc_ids(hp); 1240 set_sock_ids(hp); 1241 1242 mdesc_release(hp); 1243 1244 smp_fill_in_sib_core_maps(); 1245} 1246 1247/* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is 1248 * opened. Hold this reference until /dev/mdesc is closed to ensure 1249 * mdesc data structure is not released underneath us. Store the 1250 * pointer to mdesc structure in private_data for read and seek to use 1251 */ 1252static int mdesc_open(struct inode *inode, struct file *file) 1253{ 1254 struct mdesc_handle *hp = mdesc_grab(); 1255 1256 if (!hp) 1257 return -ENODEV; 1258 1259 file->private_data = hp; 1260 1261 return 0; 1262} 1263 1264static ssize_t mdesc_read(struct file *file, char __user *buf, 1265 size_t len, loff_t *offp) 1266{ 1267 struct mdesc_handle *hp = file->private_data; 1268 unsigned char *mdesc; 1269 int bytes_left, count = len; 1270 1271 if (*offp >= hp->handle_size) 1272 return 0; 1273 1274 bytes_left = hp->handle_size - *offp; 1275 if (count > bytes_left) 1276 count = bytes_left; 1277 1278 mdesc = (unsigned char *)&hp->mdesc; 1279 mdesc += *offp; 1280 if (!copy_to_user(buf, mdesc, count)) { 1281 *offp += count; 1282 return count; 1283 } else { 1284 return -EFAULT; 1285 } 1286} 1287 1288static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence) 1289{ 1290 struct mdesc_handle *hp = file->private_data; 1291 1292 return no_seek_end_llseek_size(file, offset, whence, hp->handle_size); 1293} 1294 1295/* mdesc_close() - /dev/mdesc is being closed, release the reference to 1296 * mdesc structure. 1297 */ 1298static int mdesc_close(struct inode *inode, struct file *file) 1299{ 1300 mdesc_release(file->private_data); 1301 return 0; 1302} 1303 1304static const struct file_operations mdesc_fops = { 1305 .open = mdesc_open, 1306 .read = mdesc_read, 1307 .llseek = mdesc_llseek, 1308 .release = mdesc_close, 1309 .owner = THIS_MODULE, 1310}; 1311 1312static struct miscdevice mdesc_misc = { 1313 .minor = MISC_DYNAMIC_MINOR, 1314 .name = "mdesc", 1315 .fops = &mdesc_fops, 1316}; 1317 1318static int __init mdesc_misc_init(void) 1319{ 1320 return misc_register(&mdesc_misc); 1321} 1322 1323__initcall(mdesc_misc_init); 1324 1325void __init sun4v_mdesc_init(void) 1326{ 1327 struct mdesc_handle *hp; 1328 unsigned long len, real_len, status; 1329 1330 (void) sun4v_mach_desc(0UL, 0UL, &len); 1331 1332 printk("MDESC: Size is %lu bytes.\n", len); 1333 1334 hp = mdesc_alloc(len, &memblock_mdesc_ops); 1335 if (hp == NULL) { 1336 prom_printf("MDESC: alloc of %lu bytes failed.\n", len); 1337 prom_halt(); 1338 } 1339 1340 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 1341 if (status != HV_EOK || real_len > len) { 1342 prom_printf("sun4v_mach_desc fails, err(%lu), " 1343 "len(%lu), real_len(%lu)\n", 1344 status, len, real_len); 1345 mdesc_free(hp); 1346 prom_halt(); 1347 } 1348 1349 cur_mdesc = hp; 1350 1351 mdesc_adi_init(); 1352 report_platform_properties(); 1353} 1354