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/memblock.h> 9 #include <linux/log2.h> 10 #include <linux/list.h> 11 #include <linux/slab.h> 12 #include <linux/mm.h> 13 #include <linux/miscdevice.h> 14 #include <linux/bootmem.h> 15 #include <linux/export.h> 16 #include <linux/refcount.h> 17 18 #include <asm/cpudata.h> 19 #include <asm/hypervisor.h> 20 #include <asm/mdesc.h> 21 #include <asm/prom.h> 22 #include <linux/uaccess.h> 23 #include <asm/oplib.h> 24 #include <asm/smp.h> 25 #include <asm/adi.h> 26 27 /* Unlike the OBP device tree, the machine description is a full-on 28 * DAG. An arbitrary number of ARCs are possible from one 29 * node to other nodes and thus we can't use the OBP device_node 30 * data structure to represent these nodes inside of the kernel. 31 * 32 * Actually, it isn't even a DAG, because there are back pointers 33 * which create cycles in the graph. 34 * 35 * mdesc_hdr and mdesc_elem describe the layout of the data structure 36 * we get from the Hypervisor. 37 */ 38 struct mdesc_hdr { 39 u32 version; /* Transport version */ 40 u32 node_sz; /* node block size */ 41 u32 name_sz; /* name block size */ 42 u32 data_sz; /* data block size */ 43 } __attribute__((aligned(16))); 44 45 struct 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 67 struct mdesc_mem_ops { 68 struct mdesc_handle *(*alloc)(unsigned int mdesc_size); 69 void (*free)(struct mdesc_handle *handle); 70 }; 71 72 struct 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 81 typedef int (*mdesc_node_info_get_f)(struct mdesc_handle *, u64, 82 union md_node_info *); 83 typedef void (*mdesc_node_info_rel_f)(union md_node_info *); 84 typedef bool (*mdesc_node_match_f)(union md_node_info *, union md_node_info *); 85 86 struct 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 93 static int get_vdev_port_node_info(struct mdesc_handle *md, u64 node, 94 union md_node_info *node_info); 95 static void rel_vdev_port_node_info(union md_node_info *node_info); 96 static bool vdev_port_node_match(union md_node_info *a_node_info, 97 union md_node_info *b_node_info); 98 99 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node, 100 union md_node_info *node_info); 101 static void rel_ds_port_node_info(union md_node_info *node_info); 102 static 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 */ 106 static 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 }; 113 114 static 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 } 148 149 static 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 } 161 162 static 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_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 } 182 183 static 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 free_bootmem_late(start, alloc_size); 194 } 195 196 static struct mdesc_mem_ops memblock_mdesc_ops = { 197 .alloc = mdesc_memblock_alloc, 198 .free = mdesc_memblock_free, 199 }; 200 201 static 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 } 223 224 static 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 } 231 232 static struct mdesc_mem_ops kmalloc_mdesc_memops = { 233 .alloc = mdesc_kmalloc, 234 .free = mdesc_kfree, 235 }; 236 237 static 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 } 247 248 static void mdesc_free(struct mdesc_handle *hp) 249 { 250 hp->mops->free(hp); 251 } 252 253 static struct mdesc_handle *cur_mdesc; 254 static LIST_HEAD(mdesc_zombie_list); 255 static DEFINE_SPINLOCK(mdesc_lock); 256 257 struct 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 } 270 EXPORT_SYMBOL(mdesc_grab); 271 272 void 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 } 283 EXPORT_SYMBOL(mdesc_release); 284 285 static DEFINE_MUTEX(mdesc_mutex); 286 static struct mdesc_notifier_client *client_list; 287 288 void 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 } 318 319 static 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 } 337 338 static 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 node_info->vdev_port.parent_cfg_hdl = *parent_cfg_hdlp; 361 362 return 0; 363 } 364 365 static void rel_vdev_port_node_info(union md_node_info *node_info) 366 { 367 if (node_info && node_info->vdev_port.name) { 368 kfree_const(node_info->vdev_port.name); 369 node_info->vdev_port.name = NULL; 370 } 371 } 372 373 static bool vdev_port_node_match(union md_node_info *a_node_info, 374 union md_node_info *b_node_info) 375 { 376 if (a_node_info->vdev_port.id != b_node_info->vdev_port.id) 377 return false; 378 379 if (a_node_info->vdev_port.parent_cfg_hdl != 380 b_node_info->vdev_port.parent_cfg_hdl) 381 return false; 382 383 if (strncmp(a_node_info->vdev_port.name, 384 b_node_info->vdev_port.name, MDESC_MAX_STR_LEN) != 0) 385 return false; 386 387 return true; 388 } 389 390 static int get_ds_port_node_info(struct mdesc_handle *md, u64 node, 391 union md_node_info *node_info) 392 { 393 const u64 *idp; 394 395 /* DS port nodes use the "id" property to distinguish them */ 396 idp = mdesc_get_property(md, node, "id", NULL); 397 if (!idp) 398 return -1; 399 400 node_info->ds_port.id = *idp; 401 402 return 0; 403 } 404 405 static void rel_ds_port_node_info(union md_node_info *node_info) 406 { 407 } 408 409 static bool ds_port_node_match(union md_node_info *a_node_info, 410 union md_node_info *b_node_info) 411 { 412 if (a_node_info->ds_port.id != b_node_info->ds_port.id) 413 return false; 414 415 return true; 416 } 417 418 /* Run 'func' on nodes which are in A but not in B. */ 419 static void invoke_on_missing(const char *name, 420 struct mdesc_handle *a, 421 struct mdesc_handle *b, 422 void (*func)(struct mdesc_handle *, u64, 423 const char *node_name)) 424 { 425 mdesc_node_info_get_f get_info_func; 426 mdesc_node_info_rel_f rel_info_func; 427 mdesc_node_match_f node_match_func; 428 union md_node_info a_node_info; 429 union md_node_info b_node_info; 430 bool found; 431 u64 a_node; 432 u64 b_node; 433 int rv; 434 435 /* 436 * Find the get_info, rel_info and node_match ops for the given 437 * node name 438 */ 439 mdesc_get_node_ops(name, &get_info_func, &rel_info_func, 440 &node_match_func); 441 442 /* If we didn't find a match, the node type is not supported */ 443 if (!get_info_func || !rel_info_func || !node_match_func) { 444 pr_err("MD: %s node type is not supported\n", name); 445 return; 446 } 447 448 mdesc_for_each_node_by_name(a, a_node, name) { 449 found = false; 450 451 rv = get_info_func(a, a_node, &a_node_info); 452 if (rv != 0) { 453 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n", 454 name); 455 continue; 456 } 457 458 /* Check each node in B for node matching a_node */ 459 mdesc_for_each_node_by_name(b, b_node, name) { 460 rv = get_info_func(b, b_node, &b_node_info); 461 if (rv != 0) 462 continue; 463 464 if (node_match_func(&a_node_info, &b_node_info)) { 465 found = true; 466 rel_info_func(&b_node_info); 467 break; 468 } 469 470 rel_info_func(&b_node_info); 471 } 472 473 rel_info_func(&a_node_info); 474 475 if (!found) 476 func(a, a_node, name); 477 } 478 } 479 480 static void notify_one(struct mdesc_notifier_client *p, 481 struct mdesc_handle *old_hp, 482 struct mdesc_handle *new_hp) 483 { 484 invoke_on_missing(p->node_name, old_hp, new_hp, p->remove); 485 invoke_on_missing(p->node_name, new_hp, old_hp, p->add); 486 } 487 488 static void mdesc_notify_clients(struct mdesc_handle *old_hp, 489 struct mdesc_handle *new_hp) 490 { 491 struct mdesc_notifier_client *p = client_list; 492 493 while (p) { 494 notify_one(p, old_hp, new_hp); 495 p = p->next; 496 } 497 } 498 499 void mdesc_update(void) 500 { 501 unsigned long len, real_len, status; 502 struct mdesc_handle *hp, *orig_hp; 503 unsigned long flags; 504 505 mutex_lock(&mdesc_mutex); 506 507 (void) sun4v_mach_desc(0UL, 0UL, &len); 508 509 hp = mdesc_alloc(len, &kmalloc_mdesc_memops); 510 if (!hp) { 511 printk(KERN_ERR "MD: mdesc alloc fails\n"); 512 goto out; 513 } 514 515 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 516 if (status != HV_EOK || real_len > len) { 517 printk(KERN_ERR "MD: mdesc reread fails with %lu\n", 518 status); 519 refcount_dec(&hp->refcnt); 520 mdesc_free(hp); 521 goto out; 522 } 523 524 spin_lock_irqsave(&mdesc_lock, flags); 525 orig_hp = cur_mdesc; 526 cur_mdesc = hp; 527 spin_unlock_irqrestore(&mdesc_lock, flags); 528 529 mdesc_notify_clients(orig_hp, hp); 530 531 spin_lock_irqsave(&mdesc_lock, flags); 532 if (refcount_dec_and_test(&orig_hp->refcnt)) 533 mdesc_free(orig_hp); 534 else 535 list_add(&orig_hp->list, &mdesc_zombie_list); 536 spin_unlock_irqrestore(&mdesc_lock, flags); 537 538 out: 539 mutex_unlock(&mdesc_mutex); 540 } 541 542 u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name, 543 union md_node_info *node_info) 544 { 545 mdesc_node_info_get_f get_info_func; 546 mdesc_node_info_rel_f rel_info_func; 547 mdesc_node_match_f node_match_func; 548 union md_node_info hp_node_info; 549 u64 hp_node; 550 int rv; 551 552 if (hp == NULL || node_name == NULL || node_info == NULL) 553 return MDESC_NODE_NULL; 554 555 /* Find the ops for the given node name */ 556 mdesc_get_node_ops(node_name, &get_info_func, &rel_info_func, 557 &node_match_func); 558 559 /* If we didn't find ops for the given node name, it is not supported */ 560 if (!get_info_func || !rel_info_func || !node_match_func) { 561 pr_err("MD: %s node is not supported\n", node_name); 562 return -EINVAL; 563 } 564 565 mdesc_for_each_node_by_name(hp, hp_node, node_name) { 566 rv = get_info_func(hp, hp_node, &hp_node_info); 567 if (rv != 0) 568 continue; 569 570 if (node_match_func(node_info, &hp_node_info)) 571 break; 572 573 rel_info_func(&hp_node_info); 574 } 575 576 rel_info_func(&hp_node_info); 577 578 return hp_node; 579 } 580 EXPORT_SYMBOL(mdesc_get_node); 581 582 int mdesc_get_node_info(struct mdesc_handle *hp, u64 node, 583 const char *node_name, union md_node_info *node_info) 584 { 585 mdesc_node_info_get_f get_info_func; 586 int rv; 587 588 if (hp == NULL || node == MDESC_NODE_NULL || 589 node_name == NULL || node_info == NULL) 590 return -EINVAL; 591 592 /* Find the get_info op for the given node name */ 593 mdesc_get_node_ops(node_name, &get_info_func, NULL, NULL); 594 595 /* If we didn't find a get_info_func, the node name is not supported */ 596 if (get_info_func == NULL) { 597 pr_err("MD: %s node is not supported\n", node_name); 598 return -EINVAL; 599 } 600 601 rv = get_info_func(hp, node, node_info); 602 if (rv != 0) { 603 pr_err("MD: Cannot find 1 or more required match properties for %s node.\n", 604 node_name); 605 return -1; 606 } 607 608 return 0; 609 } 610 EXPORT_SYMBOL(mdesc_get_node_info); 611 612 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc) 613 { 614 return (struct mdesc_elem *) (mdesc + 1); 615 } 616 617 static void *name_block(struct mdesc_hdr *mdesc) 618 { 619 return ((void *) node_block(mdesc)) + mdesc->node_sz; 620 } 621 622 static void *data_block(struct mdesc_hdr *mdesc) 623 { 624 return ((void *) name_block(mdesc)) + mdesc->name_sz; 625 } 626 627 u64 mdesc_node_by_name(struct mdesc_handle *hp, 628 u64 from_node, const char *name) 629 { 630 struct mdesc_elem *ep = node_block(&hp->mdesc); 631 const char *names = name_block(&hp->mdesc); 632 u64 last_node = hp->mdesc.node_sz / 16; 633 u64 ret; 634 635 if (from_node == MDESC_NODE_NULL) { 636 ret = from_node = 0; 637 } else if (from_node >= last_node) { 638 return MDESC_NODE_NULL; 639 } else { 640 ret = ep[from_node].d.val; 641 } 642 643 while (ret < last_node) { 644 if (ep[ret].tag != MD_NODE) 645 return MDESC_NODE_NULL; 646 if (!strcmp(names + ep[ret].name_offset, name)) 647 break; 648 ret = ep[ret].d.val; 649 } 650 if (ret >= last_node) 651 ret = MDESC_NODE_NULL; 652 return ret; 653 } 654 EXPORT_SYMBOL(mdesc_node_by_name); 655 656 const void *mdesc_get_property(struct mdesc_handle *hp, u64 node, 657 const char *name, int *lenp) 658 { 659 const char *names = name_block(&hp->mdesc); 660 u64 last_node = hp->mdesc.node_sz / 16; 661 void *data = data_block(&hp->mdesc); 662 struct mdesc_elem *ep; 663 664 if (node == MDESC_NODE_NULL || node >= last_node) 665 return NULL; 666 667 ep = node_block(&hp->mdesc) + node; 668 ep++; 669 for (; ep->tag != MD_NODE_END; ep++) { 670 void *val = NULL; 671 int len = 0; 672 673 switch (ep->tag) { 674 case MD_PROP_VAL: 675 val = &ep->d.val; 676 len = 8; 677 break; 678 679 case MD_PROP_STR: 680 case MD_PROP_DATA: 681 val = data + ep->d.data.data_offset; 682 len = ep->d.data.data_len; 683 break; 684 685 default: 686 break; 687 } 688 if (!val) 689 continue; 690 691 if (!strcmp(names + ep->name_offset, name)) { 692 if (lenp) 693 *lenp = len; 694 return val; 695 } 696 } 697 698 return NULL; 699 } 700 EXPORT_SYMBOL(mdesc_get_property); 701 702 u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type) 703 { 704 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 705 const char *names = name_block(&hp->mdesc); 706 u64 last_node = hp->mdesc.node_sz / 16; 707 708 if (from == MDESC_NODE_NULL || from >= last_node) 709 return MDESC_NODE_NULL; 710 711 ep = base + from; 712 713 ep++; 714 for (; ep->tag != MD_NODE_END; ep++) { 715 if (ep->tag != MD_PROP_ARC) 716 continue; 717 718 if (strcmp(names + ep->name_offset, arc_type)) 719 continue; 720 721 return ep - base; 722 } 723 724 return MDESC_NODE_NULL; 725 } 726 EXPORT_SYMBOL(mdesc_next_arc); 727 728 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc) 729 { 730 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 731 732 ep = base + arc; 733 734 return ep->d.val; 735 } 736 EXPORT_SYMBOL(mdesc_arc_target); 737 738 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node) 739 { 740 struct mdesc_elem *ep, *base = node_block(&hp->mdesc); 741 const char *names = name_block(&hp->mdesc); 742 u64 last_node = hp->mdesc.node_sz / 16; 743 744 if (node == MDESC_NODE_NULL || node >= last_node) 745 return NULL; 746 747 ep = base + node; 748 if (ep->tag != MD_NODE) 749 return NULL; 750 751 return names + ep->name_offset; 752 } 753 EXPORT_SYMBOL(mdesc_node_name); 754 755 static u64 max_cpus = 64; 756 757 static void __init report_platform_properties(void) 758 { 759 struct mdesc_handle *hp = mdesc_grab(); 760 u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); 761 const char *s; 762 const u64 *v; 763 764 if (pn == MDESC_NODE_NULL) { 765 prom_printf("No platform node in machine-description.\n"); 766 prom_halt(); 767 } 768 769 s = mdesc_get_property(hp, pn, "banner-name", NULL); 770 printk("PLATFORM: banner-name [%s]\n", s); 771 s = mdesc_get_property(hp, pn, "name", NULL); 772 printk("PLATFORM: name [%s]\n", s); 773 774 v = mdesc_get_property(hp, pn, "hostid", NULL); 775 if (v) 776 printk("PLATFORM: hostid [%08llx]\n", *v); 777 v = mdesc_get_property(hp, pn, "serial#", NULL); 778 if (v) 779 printk("PLATFORM: serial# [%08llx]\n", *v); 780 v = mdesc_get_property(hp, pn, "stick-frequency", NULL); 781 printk("PLATFORM: stick-frequency [%08llx]\n", *v); 782 v = mdesc_get_property(hp, pn, "mac-address", NULL); 783 if (v) 784 printk("PLATFORM: mac-address [%llx]\n", *v); 785 v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL); 786 if (v) 787 printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v); 788 v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL); 789 if (v) 790 printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v); 791 v = mdesc_get_property(hp, pn, "max-cpus", NULL); 792 if (v) { 793 max_cpus = *v; 794 printk("PLATFORM: max-cpus [%llu]\n", max_cpus); 795 } 796 797 #ifdef CONFIG_SMP 798 { 799 int max_cpu, i; 800 801 if (v) { 802 max_cpu = *v; 803 if (max_cpu > NR_CPUS) 804 max_cpu = NR_CPUS; 805 } else { 806 max_cpu = NR_CPUS; 807 } 808 for (i = 0; i < max_cpu; i++) 809 set_cpu_possible(i, true); 810 } 811 #endif 812 813 mdesc_release(hp); 814 } 815 816 static void fill_in_one_cache(cpuinfo_sparc *c, struct mdesc_handle *hp, u64 mp) 817 { 818 const u64 *level = mdesc_get_property(hp, mp, "level", NULL); 819 const u64 *size = mdesc_get_property(hp, mp, "size", NULL); 820 const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL); 821 const char *type; 822 int type_len; 823 824 type = mdesc_get_property(hp, mp, "type", &type_len); 825 826 switch (*level) { 827 case 1: 828 if (of_find_in_proplist(type, "instn", type_len)) { 829 c->icache_size = *size; 830 c->icache_line_size = *line_size; 831 } else if (of_find_in_proplist(type, "data", type_len)) { 832 c->dcache_size = *size; 833 c->dcache_line_size = *line_size; 834 } 835 break; 836 837 case 2: 838 c->ecache_size = *size; 839 c->ecache_line_size = *line_size; 840 break; 841 842 default: 843 break; 844 } 845 846 if (*level == 1) { 847 u64 a; 848 849 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 850 u64 target = mdesc_arc_target(hp, a); 851 const char *name = mdesc_node_name(hp, target); 852 853 if (!strcmp(name, "cache")) 854 fill_in_one_cache(c, hp, target); 855 } 856 } 857 } 858 859 static void find_back_node_value(struct mdesc_handle *hp, u64 node, 860 char *srch_val, 861 void (*func)(struct mdesc_handle *, u64, int), 862 u64 val, int depth) 863 { 864 u64 arc; 865 866 /* Since we have an estimate of recursion depth, do a sanity check. */ 867 if (depth == 0) 868 return; 869 870 mdesc_for_each_arc(arc, hp, node, MDESC_ARC_TYPE_BACK) { 871 u64 n = mdesc_arc_target(hp, arc); 872 const char *name = mdesc_node_name(hp, n); 873 874 if (!strcmp(srch_val, name)) 875 (*func)(hp, n, val); 876 877 find_back_node_value(hp, n, srch_val, func, val, depth-1); 878 } 879 } 880 881 static void __mark_core_id(struct mdesc_handle *hp, u64 node, 882 int core_id) 883 { 884 const u64 *id = mdesc_get_property(hp, node, "id", NULL); 885 886 if (*id < num_possible_cpus()) 887 cpu_data(*id).core_id = core_id; 888 } 889 890 static void __mark_max_cache_id(struct mdesc_handle *hp, u64 node, 891 int max_cache_id) 892 { 893 const u64 *id = mdesc_get_property(hp, node, "id", NULL); 894 895 if (*id < num_possible_cpus()) { 896 cpu_data(*id).max_cache_id = max_cache_id; 897 898 /** 899 * On systems without explicit socket descriptions socket 900 * is max_cache_id 901 */ 902 cpu_data(*id).sock_id = max_cache_id; 903 } 904 } 905 906 static void mark_core_ids(struct mdesc_handle *hp, u64 mp, 907 int core_id) 908 { 909 find_back_node_value(hp, mp, "cpu", __mark_core_id, core_id, 10); 910 } 911 912 static void mark_max_cache_ids(struct mdesc_handle *hp, u64 mp, 913 int max_cache_id) 914 { 915 find_back_node_value(hp, mp, "cpu", __mark_max_cache_id, 916 max_cache_id, 10); 917 } 918 919 static void set_core_ids(struct mdesc_handle *hp) 920 { 921 int idx; 922 u64 mp; 923 924 idx = 1; 925 926 /* Identify unique cores by looking for cpus backpointed to by 927 * level 1 instruction caches. 928 */ 929 mdesc_for_each_node_by_name(hp, mp, "cache") { 930 const u64 *level; 931 const char *type; 932 int len; 933 934 level = mdesc_get_property(hp, mp, "level", NULL); 935 if (*level != 1) 936 continue; 937 938 type = mdesc_get_property(hp, mp, "type", &len); 939 if (!of_find_in_proplist(type, "instn", len)) 940 continue; 941 942 mark_core_ids(hp, mp, idx); 943 idx++; 944 } 945 } 946 947 static int set_max_cache_ids_by_cache(struct mdesc_handle *hp, int level) 948 { 949 u64 mp; 950 int idx = 1; 951 int fnd = 0; 952 953 /** 954 * Identify unique highest level of shared cache by looking for cpus 955 * backpointed to by shared level N caches. 956 */ 957 mdesc_for_each_node_by_name(hp, mp, "cache") { 958 const u64 *cur_lvl; 959 960 cur_lvl = mdesc_get_property(hp, mp, "level", NULL); 961 if (*cur_lvl != level) 962 continue; 963 mark_max_cache_ids(hp, mp, idx); 964 idx++; 965 fnd = 1; 966 } 967 return fnd; 968 } 969 970 static void set_sock_ids_by_socket(struct mdesc_handle *hp, u64 mp) 971 { 972 int idx = 1; 973 974 mdesc_for_each_node_by_name(hp, mp, "socket") { 975 u64 a; 976 977 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 978 u64 t = mdesc_arc_target(hp, a); 979 const char *name; 980 const u64 *id; 981 982 name = mdesc_node_name(hp, t); 983 if (strcmp(name, "cpu")) 984 continue; 985 986 id = mdesc_get_property(hp, t, "id", NULL); 987 if (*id < num_possible_cpus()) 988 cpu_data(*id).sock_id = idx; 989 } 990 idx++; 991 } 992 } 993 994 static void set_sock_ids(struct mdesc_handle *hp) 995 { 996 u64 mp; 997 998 /** 999 * Find the highest level of shared cache which pre-T7 is also 1000 * the socket. 1001 */ 1002 if (!set_max_cache_ids_by_cache(hp, 3)) 1003 set_max_cache_ids_by_cache(hp, 2); 1004 1005 /* If machine description exposes sockets data use it.*/ 1006 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "sockets"); 1007 if (mp != MDESC_NODE_NULL) 1008 set_sock_ids_by_socket(hp, mp); 1009 } 1010 1011 static void mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id) 1012 { 1013 u64 a; 1014 1015 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { 1016 u64 t = mdesc_arc_target(hp, a); 1017 const char *name; 1018 const u64 *id; 1019 1020 name = mdesc_node_name(hp, t); 1021 if (strcmp(name, "cpu")) 1022 continue; 1023 1024 id = mdesc_get_property(hp, t, "id", NULL); 1025 if (*id < NR_CPUS) 1026 cpu_data(*id).proc_id = proc_id; 1027 } 1028 } 1029 1030 static void __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name) 1031 { 1032 int idx; 1033 u64 mp; 1034 1035 idx = 0; 1036 mdesc_for_each_node_by_name(hp, mp, exec_unit_name) { 1037 const char *type; 1038 int len; 1039 1040 type = mdesc_get_property(hp, mp, "type", &len); 1041 if (!of_find_in_proplist(type, "int", len) && 1042 !of_find_in_proplist(type, "integer", len)) 1043 continue; 1044 1045 mark_proc_ids(hp, mp, idx); 1046 idx++; 1047 } 1048 } 1049 1050 static void set_proc_ids(struct mdesc_handle *hp) 1051 { 1052 __set_proc_ids(hp, "exec_unit"); 1053 __set_proc_ids(hp, "exec-unit"); 1054 } 1055 1056 static void get_one_mondo_bits(const u64 *p, unsigned int *mask, 1057 unsigned long def, unsigned long max) 1058 { 1059 u64 val; 1060 1061 if (!p) 1062 goto use_default; 1063 val = *p; 1064 1065 if (!val || val >= 64) 1066 goto use_default; 1067 1068 if (val > max) 1069 val = max; 1070 1071 *mask = ((1U << val) * 64U) - 1U; 1072 return; 1073 1074 use_default: 1075 *mask = ((1U << def) * 64U) - 1U; 1076 } 1077 1078 static void get_mondo_data(struct mdesc_handle *hp, u64 mp, 1079 struct trap_per_cpu *tb) 1080 { 1081 static int printed; 1082 const u64 *val; 1083 1084 val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL); 1085 get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7, ilog2(max_cpus * 2)); 1086 1087 val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL); 1088 get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7, 8); 1089 1090 val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL); 1091 get_one_mondo_bits(val, &tb->resum_qmask, 6, 7); 1092 1093 val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL); 1094 get_one_mondo_bits(val, &tb->nonresum_qmask, 2, 2); 1095 if (!printed++) { 1096 pr_info("SUN4V: Mondo queue sizes " 1097 "[cpu(%u) dev(%u) r(%u) nr(%u)]\n", 1098 tb->cpu_mondo_qmask + 1, 1099 tb->dev_mondo_qmask + 1, 1100 tb->resum_qmask + 1, 1101 tb->nonresum_qmask + 1); 1102 } 1103 } 1104 1105 static void *mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask) 1106 { 1107 struct mdesc_handle *hp = mdesc_grab(); 1108 void *ret = NULL; 1109 u64 mp; 1110 1111 mdesc_for_each_node_by_name(hp, mp, "cpu") { 1112 const u64 *id = mdesc_get_property(hp, mp, "id", NULL); 1113 int cpuid = *id; 1114 1115 #ifdef CONFIG_SMP 1116 if (cpuid >= NR_CPUS) { 1117 printk(KERN_WARNING "Ignoring CPU %d which is " 1118 ">= NR_CPUS (%d)\n", 1119 cpuid, NR_CPUS); 1120 continue; 1121 } 1122 if (!cpumask_test_cpu(cpuid, mask)) 1123 continue; 1124 #endif 1125 1126 ret = func(hp, mp, cpuid, arg); 1127 if (ret) 1128 goto out; 1129 } 1130 out: 1131 mdesc_release(hp); 1132 return ret; 1133 } 1134 1135 static void *record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 1136 void *arg) 1137 { 1138 ncpus_probed++; 1139 #ifdef CONFIG_SMP 1140 set_cpu_present(cpuid, true); 1141 #endif 1142 return NULL; 1143 } 1144 1145 void mdesc_populate_present_mask(cpumask_t *mask) 1146 { 1147 if (tlb_type != hypervisor) 1148 return; 1149 1150 ncpus_probed = 0; 1151 mdesc_iterate_over_cpus(record_one_cpu, NULL, mask); 1152 } 1153 1154 static void * __init check_one_pgsz(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg) 1155 { 1156 const u64 *pgsz_prop = mdesc_get_property(hp, mp, "mmu-page-size-list", NULL); 1157 unsigned long *pgsz_mask = arg; 1158 u64 val; 1159 1160 val = (HV_PGSZ_MASK_8K | HV_PGSZ_MASK_64K | 1161 HV_PGSZ_MASK_512K | HV_PGSZ_MASK_4MB); 1162 if (pgsz_prop) 1163 val = *pgsz_prop; 1164 1165 if (!*pgsz_mask) 1166 *pgsz_mask = val; 1167 else 1168 *pgsz_mask &= val; 1169 return NULL; 1170 } 1171 1172 void __init mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask) 1173 { 1174 *pgsz_mask = 0; 1175 mdesc_iterate_over_cpus(check_one_pgsz, pgsz_mask, mask); 1176 } 1177 1178 static void *fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, 1179 void *arg) 1180 { 1181 const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL); 1182 struct trap_per_cpu *tb; 1183 cpuinfo_sparc *c; 1184 u64 a; 1185 1186 #ifndef CONFIG_SMP 1187 /* On uniprocessor we only want the values for the 1188 * real physical cpu the kernel booted onto, however 1189 * cpu_data() only has one entry at index 0. 1190 */ 1191 if (cpuid != real_hard_smp_processor_id()) 1192 return NULL; 1193 cpuid = 0; 1194 #endif 1195 1196 c = &cpu_data(cpuid); 1197 c->clock_tick = *cfreq; 1198 1199 tb = &trap_block[cpuid]; 1200 get_mondo_data(hp, mp, tb); 1201 1202 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { 1203 u64 j, t = mdesc_arc_target(hp, a); 1204 const char *t_name; 1205 1206 t_name = mdesc_node_name(hp, t); 1207 if (!strcmp(t_name, "cache")) { 1208 fill_in_one_cache(c, hp, t); 1209 continue; 1210 } 1211 1212 mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) { 1213 u64 n = mdesc_arc_target(hp, j); 1214 const char *n_name; 1215 1216 n_name = mdesc_node_name(hp, n); 1217 if (!strcmp(n_name, "cache")) 1218 fill_in_one_cache(c, hp, n); 1219 } 1220 } 1221 1222 c->core_id = 0; 1223 c->proc_id = -1; 1224 1225 return NULL; 1226 } 1227 1228 void mdesc_fill_in_cpu_data(cpumask_t *mask) 1229 { 1230 struct mdesc_handle *hp; 1231 1232 mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask); 1233 1234 hp = mdesc_grab(); 1235 1236 set_core_ids(hp); 1237 set_proc_ids(hp); 1238 set_sock_ids(hp); 1239 1240 mdesc_release(hp); 1241 1242 smp_fill_in_sib_core_maps(); 1243 } 1244 1245 /* mdesc_open() - Grab a reference to mdesc_handle when /dev/mdesc is 1246 * opened. Hold this reference until /dev/mdesc is closed to ensure 1247 * mdesc data structure is not released underneath us. Store the 1248 * pointer to mdesc structure in private_data for read and seek to use 1249 */ 1250 static int mdesc_open(struct inode *inode, struct file *file) 1251 { 1252 struct mdesc_handle *hp = mdesc_grab(); 1253 1254 if (!hp) 1255 return -ENODEV; 1256 1257 file->private_data = hp; 1258 1259 return 0; 1260 } 1261 1262 static ssize_t mdesc_read(struct file *file, char __user *buf, 1263 size_t len, loff_t *offp) 1264 { 1265 struct mdesc_handle *hp = file->private_data; 1266 unsigned char *mdesc; 1267 int bytes_left, count = len; 1268 1269 if (*offp >= hp->handle_size) 1270 return 0; 1271 1272 bytes_left = hp->handle_size - *offp; 1273 if (count > bytes_left) 1274 count = bytes_left; 1275 1276 mdesc = (unsigned char *)&hp->mdesc; 1277 mdesc += *offp; 1278 if (!copy_to_user(buf, mdesc, count)) { 1279 *offp += count; 1280 return count; 1281 } else { 1282 return -EFAULT; 1283 } 1284 } 1285 1286 static loff_t mdesc_llseek(struct file *file, loff_t offset, int whence) 1287 { 1288 struct mdesc_handle *hp = file->private_data; 1289 1290 return no_seek_end_llseek_size(file, offset, whence, hp->handle_size); 1291 } 1292 1293 /* mdesc_close() - /dev/mdesc is being closed, release the reference to 1294 * mdesc structure. 1295 */ 1296 static int mdesc_close(struct inode *inode, struct file *file) 1297 { 1298 mdesc_release(file->private_data); 1299 return 0; 1300 } 1301 1302 static const struct file_operations mdesc_fops = { 1303 .open = mdesc_open, 1304 .read = mdesc_read, 1305 .llseek = mdesc_llseek, 1306 .release = mdesc_close, 1307 .owner = THIS_MODULE, 1308 }; 1309 1310 static struct miscdevice mdesc_misc = { 1311 .minor = MISC_DYNAMIC_MINOR, 1312 .name = "mdesc", 1313 .fops = &mdesc_fops, 1314 }; 1315 1316 static int __init mdesc_misc_init(void) 1317 { 1318 return misc_register(&mdesc_misc); 1319 } 1320 1321 __initcall(mdesc_misc_init); 1322 1323 void __init sun4v_mdesc_init(void) 1324 { 1325 struct mdesc_handle *hp; 1326 unsigned long len, real_len, status; 1327 1328 (void) sun4v_mach_desc(0UL, 0UL, &len); 1329 1330 printk("MDESC: Size is %lu bytes.\n", len); 1331 1332 hp = mdesc_alloc(len, &memblock_mdesc_ops); 1333 if (hp == NULL) { 1334 prom_printf("MDESC: alloc of %lu bytes failed.\n", len); 1335 prom_halt(); 1336 } 1337 1338 status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len); 1339 if (status != HV_EOK || real_len > len) { 1340 prom_printf("sun4v_mach_desc fails, err(%lu), " 1341 "len(%lu), real_len(%lu)\n", 1342 status, len, real_len); 1343 mdesc_free(hp); 1344 prom_halt(); 1345 } 1346 1347 cur_mdesc = hp; 1348 1349 mdesc_adi_init(); 1350 report_platform_properties(); 1351 } 1352