1 /* 2 * acpi.c - Architecture-Specific Low-Level ACPI Support 3 * 4 * Copyright (C) 1999 VA Linux Systems 5 * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com> 6 * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co. 7 * David Mosberger-Tang <davidm@hpl.hp.com> 8 * Copyright (C) 2000 Intel Corp. 9 * Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com> 10 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 11 * Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com> 12 * Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com> 13 * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de> 14 * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com> 15 * 16 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 17 * 18 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License as published by 20 * the Free Software Foundation; either version 2 of the License, or 21 * (at your option) any later version. 22 * 23 * This program is distributed in the hope that it will be useful, 24 * but WITHOUT ANY WARRANTY; without even the implied warranty of 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 26 * GNU General Public License for more details. 27 * 28 * You should have received a copy of the GNU General Public License 29 * along with this program; if not, write to the Free Software 30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 31 * 32 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 33 */ 34 35 #include <linux/module.h> 36 #include <linux/init.h> 37 #include <linux/kernel.h> 38 #include <linux/sched.h> 39 #include <linux/smp.h> 40 #include <linux/string.h> 41 #include <linux/types.h> 42 #include <linux/irq.h> 43 #include <linux/acpi.h> 44 #include <linux/efi.h> 45 #include <linux/mmzone.h> 46 #include <linux/nodemask.h> 47 #include <linux/slab.h> 48 #include <acpi/processor.h> 49 #include <asm/io.h> 50 #include <asm/iosapic.h> 51 #include <asm/machvec.h> 52 #include <asm/page.h> 53 #include <asm/numa.h> 54 #include <asm/sal.h> 55 #include <asm/cyclone.h> 56 57 #define BAD_MADT_ENTRY(entry, end) ( \ 58 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \ 59 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry)) 60 61 #define PREFIX "ACPI: " 62 63 unsigned int acpi_cpei_override; 64 unsigned int acpi_cpei_phys_cpuid; 65 66 unsigned long acpi_wakeup_address = 0; 67 68 #ifdef CONFIG_IA64_GENERIC 69 static unsigned long __init acpi_find_rsdp(void) 70 { 71 unsigned long rsdp_phys = 0; 72 73 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 74 rsdp_phys = efi.acpi20; 75 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 76 printk(KERN_WARNING PREFIX 77 "v1.0/r0.71 tables no longer supported\n"); 78 return rsdp_phys; 79 } 80 81 const char __init * 82 acpi_get_sysname(void) 83 { 84 unsigned long rsdp_phys; 85 struct acpi_table_rsdp *rsdp; 86 struct acpi_table_xsdt *xsdt; 87 struct acpi_table_header *hdr; 88 #ifdef CONFIG_INTEL_IOMMU 89 u64 i, nentries; 90 #endif 91 92 rsdp_phys = acpi_find_rsdp(); 93 if (!rsdp_phys) { 94 printk(KERN_ERR 95 "ACPI 2.0 RSDP not found, default to \"dig\"\n"); 96 return "dig"; 97 } 98 99 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys); 100 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) { 101 printk(KERN_ERR 102 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n"); 103 return "dig"; 104 } 105 106 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address); 107 hdr = &xsdt->header; 108 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) { 109 printk(KERN_ERR 110 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n"); 111 return "dig"; 112 } 113 114 if (!strcmp(hdr->oem_id, "HP")) { 115 return "hpzx1"; 116 } else if (!strcmp(hdr->oem_id, "SGI")) { 117 if (!strcmp(hdr->oem_table_id + 4, "UV")) 118 return "uv"; 119 else 120 return "sn2"; 121 } 122 123 #ifdef CONFIG_INTEL_IOMMU 124 /* Look for Intel IOMMU */ 125 nentries = (hdr->length - sizeof(*hdr)) / 126 sizeof(xsdt->table_offset_entry[0]); 127 for (i = 0; i < nentries; i++) { 128 hdr = __va(xsdt->table_offset_entry[i]); 129 if (strncmp(hdr->signature, ACPI_SIG_DMAR, 130 sizeof(ACPI_SIG_DMAR) - 1) == 0) 131 return "dig_vtd"; 132 } 133 #endif 134 135 return "dig"; 136 } 137 #endif /* CONFIG_IA64_GENERIC */ 138 139 #define ACPI_MAX_PLATFORM_INTERRUPTS 256 140 141 /* Array to record platform interrupt vectors for generic interrupt routing. */ 142 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = { 143 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1 144 }; 145 146 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC; 147 148 /* 149 * Interrupt routing API for device drivers. Provides interrupt vector for 150 * a generic platform event. Currently only CPEI is implemented. 151 */ 152 int acpi_request_vector(u32 int_type) 153 { 154 int vector = -1; 155 156 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) { 157 /* corrected platform error interrupt */ 158 vector = platform_intr_list[int_type]; 159 } else 160 printk(KERN_ERR 161 "acpi_request_vector(): invalid interrupt type\n"); 162 return vector; 163 } 164 165 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size) 166 { 167 return __va(phys_addr); 168 } 169 170 void __init __acpi_unmap_table(char *map, unsigned long size) 171 { 172 } 173 174 /* -------------------------------------------------------------------------- 175 Boot-time Table Parsing 176 -------------------------------------------------------------------------- */ 177 178 static int available_cpus __initdata; 179 struct acpi_table_madt *acpi_madt __initdata; 180 static u8 has_8259; 181 182 static int __init 183 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header, 184 const unsigned long end) 185 { 186 struct acpi_madt_local_apic_override *lapic; 187 188 lapic = (struct acpi_madt_local_apic_override *)header; 189 190 if (BAD_MADT_ENTRY(lapic, end)) 191 return -EINVAL; 192 193 if (lapic->address) { 194 iounmap(ipi_base_addr); 195 ipi_base_addr = ioremap(lapic->address, 0); 196 } 197 return 0; 198 } 199 200 static int __init 201 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end) 202 { 203 struct acpi_madt_local_sapic *lsapic; 204 205 lsapic = (struct acpi_madt_local_sapic *)header; 206 207 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */ 208 209 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { 210 #ifdef CONFIG_SMP 211 smp_boot_data.cpu_phys_id[available_cpus] = 212 (lsapic->id << 8) | lsapic->eid; 213 #endif 214 ++available_cpus; 215 } 216 217 total_cpus++; 218 return 0; 219 } 220 221 static int __init 222 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end) 223 { 224 struct acpi_madt_local_apic_nmi *lacpi_nmi; 225 226 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header; 227 228 if (BAD_MADT_ENTRY(lacpi_nmi, end)) 229 return -EINVAL; 230 231 /* TBD: Support lapic_nmi entries */ 232 return 0; 233 } 234 235 static int __init 236 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end) 237 { 238 struct acpi_madt_io_sapic *iosapic; 239 240 iosapic = (struct acpi_madt_io_sapic *)header; 241 242 if (BAD_MADT_ENTRY(iosapic, end)) 243 return -EINVAL; 244 245 return iosapic_init(iosapic->address, iosapic->global_irq_base); 246 } 247 248 static unsigned int __initdata acpi_madt_rev; 249 250 static int __init 251 acpi_parse_plat_int_src(struct acpi_subtable_header * header, 252 const unsigned long end) 253 { 254 struct acpi_madt_interrupt_source *plintsrc; 255 int vector; 256 257 plintsrc = (struct acpi_madt_interrupt_source *)header; 258 259 if (BAD_MADT_ENTRY(plintsrc, end)) 260 return -EINVAL; 261 262 /* 263 * Get vector assignment for this interrupt, set attributes, 264 * and program the IOSAPIC routing table. 265 */ 266 vector = iosapic_register_platform_intr(plintsrc->type, 267 plintsrc->global_irq, 268 plintsrc->io_sapic_vector, 269 plintsrc->eid, 270 plintsrc->id, 271 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) == 272 ACPI_MADT_POLARITY_ACTIVE_HIGH) ? 273 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW, 274 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) == 275 ACPI_MADT_TRIGGER_EDGE) ? 276 IOSAPIC_EDGE : IOSAPIC_LEVEL); 277 278 platform_intr_list[plintsrc->type] = vector; 279 if (acpi_madt_rev > 1) { 280 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE; 281 } 282 283 /* 284 * Save the physical id, so we can check when its being removed 285 */ 286 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff; 287 288 return 0; 289 } 290 291 #ifdef CONFIG_HOTPLUG_CPU 292 unsigned int can_cpei_retarget(void) 293 { 294 extern int cpe_vector; 295 extern unsigned int force_cpei_retarget; 296 297 /* 298 * Only if CPEI is supported and the override flag 299 * is present, otherwise return that its re-targettable 300 * if we are in polling mode. 301 */ 302 if (cpe_vector > 0) { 303 if (acpi_cpei_override || force_cpei_retarget) 304 return 1; 305 else 306 return 0; 307 } 308 return 1; 309 } 310 311 unsigned int is_cpu_cpei_target(unsigned int cpu) 312 { 313 unsigned int logical_id; 314 315 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid); 316 317 if (logical_id == cpu) 318 return 1; 319 else 320 return 0; 321 } 322 323 void set_cpei_target_cpu(unsigned int cpu) 324 { 325 acpi_cpei_phys_cpuid = cpu_physical_id(cpu); 326 } 327 #endif 328 329 unsigned int get_cpei_target_cpu(void) 330 { 331 return acpi_cpei_phys_cpuid; 332 } 333 334 static int __init 335 acpi_parse_int_src_ovr(struct acpi_subtable_header * header, 336 const unsigned long end) 337 { 338 struct acpi_madt_interrupt_override *p; 339 340 p = (struct acpi_madt_interrupt_override *)header; 341 342 if (BAD_MADT_ENTRY(p, end)) 343 return -EINVAL; 344 345 iosapic_override_isa_irq(p->source_irq, p->global_irq, 346 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) == 347 ACPI_MADT_POLARITY_ACTIVE_LOW) ? 348 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH, 349 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) == 350 ACPI_MADT_TRIGGER_LEVEL) ? 351 IOSAPIC_LEVEL : IOSAPIC_EDGE); 352 return 0; 353 } 354 355 static int __init 356 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end) 357 { 358 struct acpi_madt_nmi_source *nmi_src; 359 360 nmi_src = (struct acpi_madt_nmi_source *)header; 361 362 if (BAD_MADT_ENTRY(nmi_src, end)) 363 return -EINVAL; 364 365 /* TBD: Support nimsrc entries */ 366 return 0; 367 } 368 369 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id) 370 { 371 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) { 372 373 /* 374 * Unfortunately ITC_DRIFT is not yet part of the 375 * official SAL spec, so the ITC_DRIFT bit is not 376 * set by the BIOS on this hardware. 377 */ 378 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT; 379 380 cyclone_setup(); 381 } 382 } 383 384 static int __init acpi_parse_madt(struct acpi_table_header *table) 385 { 386 if (!table) 387 return -EINVAL; 388 389 acpi_madt = (struct acpi_table_madt *)table; 390 391 acpi_madt_rev = acpi_madt->header.revision; 392 393 /* remember the value for reference after free_initmem() */ 394 #ifdef CONFIG_ITANIUM 395 has_8259 = 1; /* Firmware on old Itanium systems is broken */ 396 #else 397 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT; 398 #endif 399 iosapic_system_init(has_8259); 400 401 /* Get base address of IPI Message Block */ 402 403 if (acpi_madt->address) 404 ipi_base_addr = ioremap(acpi_madt->address, 0); 405 406 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr); 407 408 acpi_madt_oem_check(acpi_madt->header.oem_id, 409 acpi_madt->header.oem_table_id); 410 411 return 0; 412 } 413 414 #ifdef CONFIG_ACPI_NUMA 415 416 #undef SLIT_DEBUG 417 418 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32) 419 420 static int __initdata srat_num_cpus; /* number of cpus */ 421 static u32 pxm_flag[PXM_FLAG_LEN]; 422 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag)) 423 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag)) 424 static struct acpi_table_slit __initdata *slit_table; 425 cpumask_t early_cpu_possible_map = CPU_MASK_NONE; 426 427 static int __init 428 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa) 429 { 430 int pxm; 431 432 pxm = pa->proximity_domain_lo; 433 if (ia64_platform_is("sn2") || acpi_srat_revision >= 2) 434 pxm += pa->proximity_domain_hi[0] << 8; 435 return pxm; 436 } 437 438 static int __init 439 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma) 440 { 441 int pxm; 442 443 pxm = ma->proximity_domain; 444 if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1) 445 pxm &= 0xff; 446 447 return pxm; 448 } 449 450 /* 451 * ACPI 2.0 SLIT (System Locality Information Table) 452 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf 453 */ 454 void __init acpi_numa_slit_init(struct acpi_table_slit *slit) 455 { 456 u32 len; 457 458 len = sizeof(struct acpi_table_header) + 8 459 + slit->locality_count * slit->locality_count; 460 if (slit->header.length != len) { 461 printk(KERN_ERR 462 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n", 463 len, slit->header.length); 464 return; 465 } 466 slit_table = slit; 467 } 468 469 void __init 470 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 471 { 472 int pxm; 473 474 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED)) 475 return; 476 477 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) { 478 printk_once(KERN_WARNING 479 "node_cpuid[%ld] is too small, may not be able to use all cpus\n", 480 ARRAY_SIZE(node_cpuid)); 481 return; 482 } 483 pxm = get_processor_proximity_domain(pa); 484 485 /* record this node in proximity bitmap */ 486 pxm_bit_set(pxm); 487 488 node_cpuid[srat_num_cpus].phys_id = 489 (pa->apic_id << 8) | (pa->local_sapic_eid); 490 /* nid should be overridden as logical node id later */ 491 node_cpuid[srat_num_cpus].nid = pxm; 492 cpu_set(srat_num_cpus, early_cpu_possible_map); 493 srat_num_cpus++; 494 } 495 496 int __init 497 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) 498 { 499 unsigned long paddr, size; 500 int pxm; 501 struct node_memblk_s *p, *q, *pend; 502 503 pxm = get_memory_proximity_domain(ma); 504 505 /* fill node memory chunk structure */ 506 paddr = ma->base_address; 507 size = ma->length; 508 509 /* Ignore disabled entries */ 510 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED)) 511 return -1; 512 513 /* record this node in proximity bitmap */ 514 pxm_bit_set(pxm); 515 516 /* Insertion sort based on base address */ 517 pend = &node_memblk[num_node_memblks]; 518 for (p = &node_memblk[0]; p < pend; p++) { 519 if (paddr < p->start_paddr) 520 break; 521 } 522 if (p < pend) { 523 for (q = pend - 1; q >= p; q--) 524 *(q + 1) = *q; 525 } 526 p->start_paddr = paddr; 527 p->size = size; 528 p->nid = pxm; 529 num_node_memblks++; 530 return 0; 531 } 532 533 void __init acpi_numa_arch_fixup(void) 534 { 535 int i, j, node_from, node_to; 536 537 /* If there's no SRAT, fix the phys_id and mark node 0 online */ 538 if (srat_num_cpus == 0) { 539 node_set_online(0); 540 node_cpuid[0].phys_id = hard_smp_processor_id(); 541 return; 542 } 543 544 /* 545 * MCD - This can probably be dropped now. No need for pxm ID to node ID 546 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES. 547 */ 548 nodes_clear(node_online_map); 549 for (i = 0; i < MAX_PXM_DOMAINS; i++) { 550 if (pxm_bit_test(i)) { 551 int nid = acpi_map_pxm_to_node(i); 552 node_set_online(nid); 553 } 554 } 555 556 /* set logical node id in memory chunk structure */ 557 for (i = 0; i < num_node_memblks; i++) 558 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid); 559 560 /* assign memory bank numbers for each chunk on each node */ 561 for_each_online_node(i) { 562 int bank; 563 564 bank = 0; 565 for (j = 0; j < num_node_memblks; j++) 566 if (node_memblk[j].nid == i) 567 node_memblk[j].bank = bank++; 568 } 569 570 /* set logical node id in cpu structure */ 571 for_each_possible_early_cpu(i) 572 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid); 573 574 printk(KERN_INFO "Number of logical nodes in system = %d\n", 575 num_online_nodes()); 576 printk(KERN_INFO "Number of memory chunks in system = %d\n", 577 num_node_memblks); 578 579 if (!slit_table) { 580 for (i = 0; i < MAX_NUMNODES; i++) 581 for (j = 0; j < MAX_NUMNODES; j++) 582 node_distance(i, j) = i == j ? LOCAL_DISTANCE : 583 REMOTE_DISTANCE; 584 return; 585 } 586 587 memset(numa_slit, -1, sizeof(numa_slit)); 588 for (i = 0; i < slit_table->locality_count; i++) { 589 if (!pxm_bit_test(i)) 590 continue; 591 node_from = pxm_to_node(i); 592 for (j = 0; j < slit_table->locality_count; j++) { 593 if (!pxm_bit_test(j)) 594 continue; 595 node_to = pxm_to_node(j); 596 node_distance(node_from, node_to) = 597 slit_table->entry[i * slit_table->locality_count + j]; 598 } 599 } 600 601 #ifdef SLIT_DEBUG 602 printk("ACPI 2.0 SLIT locality table:\n"); 603 for_each_online_node(i) { 604 for_each_online_node(j) 605 printk("%03d ", node_distance(i, j)); 606 printk("\n"); 607 } 608 #endif 609 } 610 #endif /* CONFIG_ACPI_NUMA */ 611 612 /* 613 * success: return IRQ number (>=0) 614 * failure: return < 0 615 */ 616 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity) 617 { 618 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) 619 return gsi; 620 621 if (has_8259 && gsi < 16) 622 return isa_irq_to_vector(gsi); 623 624 return iosapic_register_intr(gsi, 625 (polarity == 626 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH : 627 IOSAPIC_POL_LOW, 628 (triggering == 629 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE : 630 IOSAPIC_LEVEL); 631 } 632 EXPORT_SYMBOL_GPL(acpi_register_gsi); 633 634 void acpi_unregister_gsi(u32 gsi) 635 { 636 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) 637 return; 638 639 if (has_8259 && gsi < 16) 640 return; 641 642 iosapic_unregister_intr(gsi); 643 } 644 EXPORT_SYMBOL_GPL(acpi_unregister_gsi); 645 646 static int __init acpi_parse_fadt(struct acpi_table_header *table) 647 { 648 struct acpi_table_header *fadt_header; 649 struct acpi_table_fadt *fadt; 650 651 if (!table) 652 return -EINVAL; 653 654 fadt_header = (struct acpi_table_header *)table; 655 if (fadt_header->revision != 3) 656 return -ENODEV; /* Only deal with ACPI 2.0 FADT */ 657 658 fadt = (struct acpi_table_fadt *)fadt_header; 659 660 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, 661 ACPI_ACTIVE_LOW); 662 return 0; 663 } 664 665 int __init early_acpi_boot_init(void) 666 { 667 int ret; 668 669 /* 670 * do a partial walk of MADT to determine how many CPUs 671 * we have including offline CPUs 672 */ 673 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 674 printk(KERN_ERR PREFIX "Can't find MADT\n"); 675 return 0; 676 } 677 678 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, 679 acpi_parse_lsapic, NR_CPUS); 680 if (ret < 1) 681 printk(KERN_ERR PREFIX 682 "Error parsing MADT - no LAPIC entries\n"); 683 684 #ifdef CONFIG_SMP 685 if (available_cpus == 0) { 686 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n"); 687 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id()); 688 smp_boot_data.cpu_phys_id[available_cpus] = 689 hard_smp_processor_id(); 690 available_cpus = 1; /* We've got at least one of these, no? */ 691 } 692 smp_boot_data.cpu_count = available_cpus; 693 #endif 694 /* Make boot-up look pretty */ 695 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus, 696 total_cpus); 697 698 return 0; 699 } 700 701 int __init acpi_boot_init(void) 702 { 703 704 /* 705 * MADT 706 * ---- 707 * Parse the Multiple APIC Description Table (MADT), if exists. 708 * Note that this table provides platform SMP configuration 709 * information -- the successor to MPS tables. 710 */ 711 712 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 713 printk(KERN_ERR PREFIX "Can't find MADT\n"); 714 goto skip_madt; 715 } 716 717 /* Local APIC */ 718 719 if (acpi_table_parse_madt 720 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0) 721 printk(KERN_ERR PREFIX 722 "Error parsing LAPIC address override entry\n"); 723 724 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0) 725 < 0) 726 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n"); 727 728 /* I/O APIC */ 729 730 if (acpi_table_parse_madt 731 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) { 732 if (!ia64_platform_is("sn2")) 733 printk(KERN_ERR PREFIX 734 "Error parsing MADT - no IOSAPIC entries\n"); 735 } 736 737 /* System-Level Interrupt Routing */ 738 739 if (acpi_table_parse_madt 740 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src, 741 ACPI_MAX_PLATFORM_INTERRUPTS) < 0) 742 printk(KERN_ERR PREFIX 743 "Error parsing platform interrupt source entry\n"); 744 745 if (acpi_table_parse_madt 746 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0) 747 printk(KERN_ERR PREFIX 748 "Error parsing interrupt source overrides entry\n"); 749 750 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0) 751 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n"); 752 skip_madt: 753 754 /* 755 * FADT says whether a legacy keyboard controller is present. 756 * The FADT also contains an SCI_INT line, by which the system 757 * gets interrupts such as power and sleep buttons. If it's not 758 * on a Legacy interrupt, it needs to be setup. 759 */ 760 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt)) 761 printk(KERN_ERR PREFIX "Can't find FADT\n"); 762 763 #ifdef CONFIG_ACPI_NUMA 764 #ifdef CONFIG_SMP 765 if (srat_num_cpus == 0) { 766 int cpu, i = 1; 767 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++) 768 if (smp_boot_data.cpu_phys_id[cpu] != 769 hard_smp_processor_id()) 770 node_cpuid[i++].phys_id = 771 smp_boot_data.cpu_phys_id[cpu]; 772 } 773 #endif 774 build_cpu_to_node_map(); 775 #endif 776 return 0; 777 } 778 779 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq) 780 { 781 int tmp; 782 783 if (has_8259 && gsi < 16) 784 *irq = isa_irq_to_vector(gsi); 785 else { 786 tmp = gsi_to_irq(gsi); 787 if (tmp == -1) 788 return -1; 789 *irq = tmp; 790 } 791 return 0; 792 } 793 794 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi) 795 { 796 if (isa_irq >= 16) 797 return -1; 798 *gsi = isa_irq; 799 return 0; 800 } 801 802 /* 803 * ACPI based hotplug CPU support 804 */ 805 #ifdef CONFIG_ACPI_HOTPLUG_CPU 806 static 807 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 808 { 809 #ifdef CONFIG_ACPI_NUMA 810 int pxm_id; 811 int nid; 812 813 pxm_id = acpi_get_pxm(handle); 814 /* 815 * We don't have cpu-only-node hotadd. But if the system equips 816 * SRAT table, pxm is already found and node is ready. 817 * So, just pxm_to_nid(pxm) is OK. 818 * This code here is for the system which doesn't have full SRAT 819 * table for possible cpus. 820 */ 821 nid = acpi_map_pxm_to_node(pxm_id); 822 node_cpuid[cpu].phys_id = physid; 823 node_cpuid[cpu].nid = nid; 824 #endif 825 return (0); 826 } 827 828 int additional_cpus __initdata = -1; 829 830 static __init int setup_additional_cpus(char *s) 831 { 832 if (s) 833 additional_cpus = simple_strtol(s, NULL, 0); 834 835 return 0; 836 } 837 838 early_param("additional_cpus", setup_additional_cpus); 839 840 /* 841 * cpu_possible_mask should be static, it cannot change as CPUs 842 * are onlined, or offlined. The reason is per-cpu data-structures 843 * are allocated by some modules at init time, and dont expect to 844 * do this dynamically on cpu arrival/departure. 845 * cpu_present_mask on the other hand can change dynamically. 846 * In case when cpu_hotplug is not compiled, then we resort to current 847 * behaviour, which is cpu_possible == cpu_present. 848 * - Ashok Raj 849 * 850 * Three ways to find out the number of additional hotplug CPUs: 851 * - If the BIOS specified disabled CPUs in ACPI/mptables use that. 852 * - The user can overwrite it with additional_cpus=NUM 853 * - Otherwise don't reserve additional CPUs. 854 */ 855 __init void prefill_possible_map(void) 856 { 857 int i; 858 int possible, disabled_cpus; 859 860 disabled_cpus = total_cpus - available_cpus; 861 862 if (additional_cpus == -1) { 863 if (disabled_cpus > 0) 864 additional_cpus = disabled_cpus; 865 else 866 additional_cpus = 0; 867 } 868 869 possible = available_cpus + additional_cpus; 870 871 if (possible > nr_cpu_ids) 872 possible = nr_cpu_ids; 873 874 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n", 875 possible, max((possible - available_cpus), 0)); 876 877 for (i = 0; i < possible; i++) 878 set_cpu_possible(i, true); 879 } 880 881 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu) 882 { 883 cpumask_t tmp_map; 884 int cpu; 885 886 cpumask_complement(&tmp_map, cpu_present_mask); 887 cpu = cpumask_first(&tmp_map); 888 if (cpu >= nr_cpu_ids) 889 return -EINVAL; 890 891 acpi_map_cpu2node(handle, cpu, physid); 892 893 set_cpu_present(cpu, true); 894 ia64_cpu_to_sapicid[cpu] = physid; 895 896 acpi_processor_set_pdc(handle); 897 898 *pcpu = cpu; 899 return (0); 900 } 901 902 /* wrapper to silence section mismatch warning */ 903 int __ref acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu) 904 { 905 return _acpi_map_lsapic(handle, physid, pcpu); 906 } 907 EXPORT_SYMBOL(acpi_map_lsapic); 908 909 int acpi_unmap_lsapic(int cpu) 910 { 911 ia64_cpu_to_sapicid[cpu] = -1; 912 set_cpu_present(cpu, false); 913 914 #ifdef CONFIG_ACPI_NUMA 915 /* NUMA specific cleanup's */ 916 #endif 917 918 return (0); 919 } 920 921 EXPORT_SYMBOL(acpi_unmap_lsapic); 922 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 923 924 #ifdef CONFIG_ACPI_NUMA 925 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth, 926 void *context, void **ret) 927 { 928 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 929 union acpi_object *obj; 930 struct acpi_madt_io_sapic *iosapic; 931 unsigned int gsi_base; 932 int pxm, node; 933 934 /* Only care about objects w/ a method that returns the MADT */ 935 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 936 return AE_OK; 937 938 if (!buffer.length || !buffer.pointer) 939 return AE_OK; 940 941 obj = buffer.pointer; 942 if (obj->type != ACPI_TYPE_BUFFER || 943 obj->buffer.length < sizeof(*iosapic)) { 944 kfree(buffer.pointer); 945 return AE_OK; 946 } 947 948 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer; 949 950 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) { 951 kfree(buffer.pointer); 952 return AE_OK; 953 } 954 955 gsi_base = iosapic->global_irq_base; 956 957 kfree(buffer.pointer); 958 959 /* 960 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell 961 * us which node to associate this with. 962 */ 963 pxm = acpi_get_pxm(handle); 964 if (pxm < 0) 965 return AE_OK; 966 967 node = pxm_to_node(pxm); 968 969 if (node >= MAX_NUMNODES || !node_online(node) || 970 cpumask_empty(cpumask_of_node(node))) 971 return AE_OK; 972 973 /* We know a gsi to node mapping! */ 974 map_iosapic_to_node(gsi_base, node); 975 return AE_OK; 976 } 977 978 static int __init 979 acpi_map_iosapics (void) 980 { 981 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL); 982 return 0; 983 } 984 985 fs_initcall(acpi_map_iosapics); 986 #endif /* CONFIG_ACPI_NUMA */ 987 988 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) 989 { 990 int err; 991 992 if ((err = iosapic_init(phys_addr, gsi_base))) 993 return err; 994 995 #ifdef CONFIG_ACPI_NUMA 996 acpi_map_iosapic(handle, 0, NULL, NULL); 997 #endif /* CONFIG_ACPI_NUMA */ 998 999 return 0; 1000 } 1001 1002 EXPORT_SYMBOL(acpi_register_ioapic); 1003 1004 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base) 1005 { 1006 return iosapic_remove(gsi_base); 1007 } 1008 1009 EXPORT_SYMBOL(acpi_unregister_ioapic); 1010 1011 /* 1012 * acpi_suspend_lowlevel() - save kernel state and suspend. 1013 * 1014 * TBD when when IA64 starts to support suspend... 1015 */ 1016 int acpi_suspend_lowlevel(void) { return 0; } 1017