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