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 <asm/io.h> 48 #include <asm/iosapic.h> 49 #include <asm/machvec.h> 50 #include <asm/page.h> 51 #include <asm/system.h> 52 #include <asm/numa.h> 53 #include <asm/sal.h> 54 #include <asm/cyclone.h> 55 56 #define BAD_MADT_ENTRY(entry, end) ( \ 57 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \ 58 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry)) 59 60 #define PREFIX "ACPI: " 61 62 void (*pm_idle) (void); 63 EXPORT_SYMBOL(pm_idle); 64 void (*pm_power_off) (void); 65 EXPORT_SYMBOL(pm_power_off); 66 67 unsigned int acpi_cpei_override; 68 unsigned int acpi_cpei_phys_cpuid; 69 70 const char *acpi_get_sysname(void) 71 { 72 #ifdef CONFIG_IA64_GENERIC 73 unsigned long rsdp_phys; 74 struct acpi_table_rsdp *rsdp; 75 struct acpi_table_xsdt *xsdt; 76 struct acpi_table_header *hdr; 77 78 rsdp_phys = acpi_find_rsdp(); 79 if (!rsdp_phys) { 80 printk(KERN_ERR 81 "ACPI 2.0 RSDP not found, default to \"dig\"\n"); 82 return "dig"; 83 } 84 85 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys); 86 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) { 87 printk(KERN_ERR 88 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n"); 89 return "dig"; 90 } 91 92 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address); 93 hdr = &xsdt->header; 94 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) { 95 printk(KERN_ERR 96 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n"); 97 return "dig"; 98 } 99 100 if (!strcmp(hdr->oem_id, "HP")) { 101 return "hpzx1"; 102 } else if (!strcmp(hdr->oem_id, "SGI")) { 103 return "sn2"; 104 } 105 106 return "dig"; 107 #else 108 # if defined (CONFIG_IA64_HP_SIM) 109 return "hpsim"; 110 # elif defined (CONFIG_IA64_HP_ZX1) 111 return "hpzx1"; 112 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB) 113 return "hpzx1_swiotlb"; 114 # elif defined (CONFIG_IA64_SGI_SN2) 115 return "sn2"; 116 # elif defined (CONFIG_IA64_DIG) 117 return "dig"; 118 # else 119 # error Unknown platform. Fix acpi.c. 120 # endif 121 #endif 122 } 123 124 #ifdef CONFIG_ACPI 125 126 #define ACPI_MAX_PLATFORM_INTERRUPTS 256 127 128 /* Array to record platform interrupt vectors for generic interrupt routing. */ 129 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = { 130 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1 131 }; 132 133 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC; 134 135 /* 136 * Interrupt routing API for device drivers. Provides interrupt vector for 137 * a generic platform event. Currently only CPEI is implemented. 138 */ 139 int acpi_request_vector(u32 int_type) 140 { 141 int vector = -1; 142 143 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) { 144 /* corrected platform error interrupt */ 145 vector = platform_intr_list[int_type]; 146 } else 147 printk(KERN_ERR 148 "acpi_request_vector(): invalid interrupt type\n"); 149 return vector; 150 } 151 152 char *__acpi_map_table(unsigned long phys_addr, unsigned long size) 153 { 154 return __va(phys_addr); 155 } 156 157 /* -------------------------------------------------------------------------- 158 Boot-time Table Parsing 159 -------------------------------------------------------------------------- */ 160 161 static int total_cpus __initdata; 162 static int available_cpus __initdata; 163 struct acpi_table_madt *acpi_madt __initdata; 164 static u8 has_8259; 165 166 static int __init 167 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header, 168 const unsigned long end) 169 { 170 struct acpi_madt_local_apic_override *lapic; 171 172 lapic = (struct acpi_madt_local_apic_override *)header; 173 174 if (BAD_MADT_ENTRY(lapic, end)) 175 return -EINVAL; 176 177 if (lapic->address) { 178 iounmap(ipi_base_addr); 179 ipi_base_addr = ioremap(lapic->address, 0); 180 } 181 return 0; 182 } 183 184 static int __init 185 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end) 186 { 187 struct acpi_madt_local_sapic *lsapic; 188 189 lsapic = (struct acpi_madt_local_sapic *)header; 190 191 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */ 192 193 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { 194 #ifdef CONFIG_SMP 195 smp_boot_data.cpu_phys_id[available_cpus] = 196 (lsapic->id << 8) | lsapic->eid; 197 #endif 198 ++available_cpus; 199 } 200 201 total_cpus++; 202 return 0; 203 } 204 205 static int __init 206 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end) 207 { 208 struct acpi_madt_local_apic_nmi *lacpi_nmi; 209 210 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header; 211 212 if (BAD_MADT_ENTRY(lacpi_nmi, end)) 213 return -EINVAL; 214 215 /* TBD: Support lapic_nmi entries */ 216 return 0; 217 } 218 219 static int __init 220 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end) 221 { 222 struct acpi_madt_io_sapic *iosapic; 223 224 iosapic = (struct acpi_madt_io_sapic *)header; 225 226 if (BAD_MADT_ENTRY(iosapic, end)) 227 return -EINVAL; 228 229 return iosapic_init(iosapic->address, iosapic->global_irq_base); 230 } 231 232 static unsigned int __initdata acpi_madt_rev; 233 234 static int __init 235 acpi_parse_plat_int_src(struct acpi_subtable_header * header, 236 const unsigned long end) 237 { 238 struct acpi_madt_interrupt_source *plintsrc; 239 int vector; 240 241 plintsrc = (struct acpi_madt_interrupt_source *)header; 242 243 if (BAD_MADT_ENTRY(plintsrc, end)) 244 return -EINVAL; 245 246 /* 247 * Get vector assignment for this interrupt, set attributes, 248 * and program the IOSAPIC routing table. 249 */ 250 vector = iosapic_register_platform_intr(plintsrc->type, 251 plintsrc->global_irq, 252 plintsrc->io_sapic_vector, 253 plintsrc->eid, 254 plintsrc->id, 255 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) == 256 ACPI_MADT_POLARITY_ACTIVE_HIGH) ? 257 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW, 258 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) == 259 ACPI_MADT_TRIGGER_EDGE) ? 260 IOSAPIC_EDGE : IOSAPIC_LEVEL); 261 262 platform_intr_list[plintsrc->type] = vector; 263 if (acpi_madt_rev > 1) { 264 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE; 265 } 266 267 /* 268 * Save the physical id, so we can check when its being removed 269 */ 270 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff; 271 272 return 0; 273 } 274 275 #ifdef CONFIG_HOTPLUG_CPU 276 unsigned int can_cpei_retarget(void) 277 { 278 extern int cpe_vector; 279 extern unsigned int force_cpei_retarget; 280 281 /* 282 * Only if CPEI is supported and the override flag 283 * is present, otherwise return that its re-targettable 284 * if we are in polling mode. 285 */ 286 if (cpe_vector > 0) { 287 if (acpi_cpei_override || force_cpei_retarget) 288 return 1; 289 else 290 return 0; 291 } 292 return 1; 293 } 294 295 unsigned int is_cpu_cpei_target(unsigned int cpu) 296 { 297 unsigned int logical_id; 298 299 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid); 300 301 if (logical_id == cpu) 302 return 1; 303 else 304 return 0; 305 } 306 307 void set_cpei_target_cpu(unsigned int cpu) 308 { 309 acpi_cpei_phys_cpuid = cpu_physical_id(cpu); 310 } 311 #endif 312 313 unsigned int get_cpei_target_cpu(void) 314 { 315 return acpi_cpei_phys_cpuid; 316 } 317 318 static int __init 319 acpi_parse_int_src_ovr(struct acpi_subtable_header * header, 320 const unsigned long end) 321 { 322 struct acpi_madt_interrupt_override *p; 323 324 p = (struct acpi_madt_interrupt_override *)header; 325 326 if (BAD_MADT_ENTRY(p, end)) 327 return -EINVAL; 328 329 iosapic_override_isa_irq(p->source_irq, p->global_irq, 330 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) == 331 ACPI_MADT_POLARITY_ACTIVE_HIGH) ? 332 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW, 333 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) == 334 ACPI_MADT_TRIGGER_EDGE) ? 335 IOSAPIC_EDGE : IOSAPIC_LEVEL); 336 return 0; 337 } 338 339 static int __init 340 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end) 341 { 342 struct acpi_madt_nmi_source *nmi_src; 343 344 nmi_src = (struct acpi_madt_nmi_source *)header; 345 346 if (BAD_MADT_ENTRY(nmi_src, end)) 347 return -EINVAL; 348 349 /* TBD: Support nimsrc entries */ 350 return 0; 351 } 352 353 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id) 354 { 355 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) { 356 357 /* 358 * Unfortunately ITC_DRIFT is not yet part of the 359 * official SAL spec, so the ITC_DRIFT bit is not 360 * set by the BIOS on this hardware. 361 */ 362 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT; 363 364 cyclone_setup(); 365 } 366 } 367 368 static int __init acpi_parse_madt(struct acpi_table_header *table) 369 { 370 if (!table) 371 return -EINVAL; 372 373 acpi_madt = (struct acpi_table_madt *)table; 374 375 acpi_madt_rev = acpi_madt->header.revision; 376 377 /* remember the value for reference after free_initmem() */ 378 #ifdef CONFIG_ITANIUM 379 has_8259 = 1; /* Firmware on old Itanium systems is broken */ 380 #else 381 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT; 382 #endif 383 iosapic_system_init(has_8259); 384 385 /* Get base address of IPI Message Block */ 386 387 if (acpi_madt->address) 388 ipi_base_addr = ioremap(acpi_madt->address, 0); 389 390 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr); 391 392 acpi_madt_oem_check(acpi_madt->header.oem_id, 393 acpi_madt->header.oem_table_id); 394 395 return 0; 396 } 397 398 #ifdef CONFIG_ACPI_NUMA 399 400 #undef SLIT_DEBUG 401 402 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32) 403 404 static int __initdata srat_num_cpus; /* number of cpus */ 405 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN]; 406 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag)) 407 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag)) 408 static struct acpi_table_slit __initdata *slit_table; 409 410 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa) 411 { 412 int pxm; 413 414 pxm = pa->proximity_domain_lo; 415 if (ia64_platform_is("sn2")) 416 pxm += pa->proximity_domain_hi[0] << 8; 417 return pxm; 418 } 419 420 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma) 421 { 422 int pxm; 423 424 pxm = ma->proximity_domain; 425 if (!ia64_platform_is("sn2")) 426 pxm &= 0xff; 427 428 return pxm; 429 } 430 431 /* 432 * ACPI 2.0 SLIT (System Locality Information Table) 433 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf 434 */ 435 void __init acpi_numa_slit_init(struct acpi_table_slit *slit) 436 { 437 u32 len; 438 439 len = sizeof(struct acpi_table_header) + 8 440 + slit->locality_count * slit->locality_count; 441 if (slit->header.length != len) { 442 printk(KERN_ERR 443 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n", 444 len, slit->header.length); 445 memset(numa_slit, 10, sizeof(numa_slit)); 446 return; 447 } 448 slit_table = slit; 449 } 450 451 void __init 452 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 453 { 454 int pxm; 455 456 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED)) 457 return; 458 459 pxm = get_processor_proximity_domain(pa); 460 461 /* record this node in proximity bitmap */ 462 pxm_bit_set(pxm); 463 464 node_cpuid[srat_num_cpus].phys_id = 465 (pa->apic_id << 8) | (pa->local_sapic_eid); 466 /* nid should be overridden as logical node id later */ 467 node_cpuid[srat_num_cpus].nid = pxm; 468 srat_num_cpus++; 469 } 470 471 void __init 472 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) 473 { 474 unsigned long paddr, size; 475 int pxm; 476 struct node_memblk_s *p, *q, *pend; 477 478 pxm = get_memory_proximity_domain(ma); 479 480 /* fill node memory chunk structure */ 481 paddr = ma->base_address; 482 size = ma->length; 483 484 /* Ignore disabled entries */ 485 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED)) 486 return; 487 488 /* record this node in proximity bitmap */ 489 pxm_bit_set(pxm); 490 491 /* Insertion sort based on base address */ 492 pend = &node_memblk[num_node_memblks]; 493 for (p = &node_memblk[0]; p < pend; p++) { 494 if (paddr < p->start_paddr) 495 break; 496 } 497 if (p < pend) { 498 for (q = pend - 1; q >= p; q--) 499 *(q + 1) = *q; 500 } 501 p->start_paddr = paddr; 502 p->size = size; 503 p->nid = pxm; 504 num_node_memblks++; 505 } 506 507 void __init acpi_numa_arch_fixup(void) 508 { 509 int i, j, node_from, node_to; 510 511 /* If there's no SRAT, fix the phys_id and mark node 0 online */ 512 if (srat_num_cpus == 0) { 513 node_set_online(0); 514 node_cpuid[0].phys_id = hard_smp_processor_id(); 515 return; 516 } 517 518 /* 519 * MCD - This can probably be dropped now. No need for pxm ID to node ID 520 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES. 521 */ 522 nodes_clear(node_online_map); 523 for (i = 0; i < MAX_PXM_DOMAINS; i++) { 524 if (pxm_bit_test(i)) { 525 int nid = acpi_map_pxm_to_node(i); 526 node_set_online(nid); 527 } 528 } 529 530 /* set logical node id in memory chunk structure */ 531 for (i = 0; i < num_node_memblks; i++) 532 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid); 533 534 /* assign memory bank numbers for each chunk on each node */ 535 for_each_online_node(i) { 536 int bank; 537 538 bank = 0; 539 for (j = 0; j < num_node_memblks; j++) 540 if (node_memblk[j].nid == i) 541 node_memblk[j].bank = bank++; 542 } 543 544 /* set logical node id in cpu structure */ 545 for (i = 0; i < srat_num_cpus; i++) 546 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid); 547 548 printk(KERN_INFO "Number of logical nodes in system = %d\n", 549 num_online_nodes()); 550 printk(KERN_INFO "Number of memory chunks in system = %d\n", 551 num_node_memblks); 552 553 if (!slit_table) 554 return; 555 memset(numa_slit, -1, sizeof(numa_slit)); 556 for (i = 0; i < slit_table->locality_count; i++) { 557 if (!pxm_bit_test(i)) 558 continue; 559 node_from = pxm_to_node(i); 560 for (j = 0; j < slit_table->locality_count; j++) { 561 if (!pxm_bit_test(j)) 562 continue; 563 node_to = pxm_to_node(j); 564 node_distance(node_from, node_to) = 565 slit_table->entry[i * slit_table->locality_count + j]; 566 } 567 } 568 569 #ifdef SLIT_DEBUG 570 printk("ACPI 2.0 SLIT locality table:\n"); 571 for_each_online_node(i) { 572 for_each_online_node(j) 573 printk("%03d ", node_distance(i, j)); 574 printk("\n"); 575 } 576 #endif 577 } 578 #endif /* CONFIG_ACPI_NUMA */ 579 580 /* 581 * success: return IRQ number (>=0) 582 * failure: return < 0 583 */ 584 int acpi_register_gsi(u32 gsi, int triggering, int polarity) 585 { 586 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) 587 return gsi; 588 589 if (has_8259 && gsi < 16) 590 return isa_irq_to_vector(gsi); 591 592 return iosapic_register_intr(gsi, 593 (polarity == 594 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH : 595 IOSAPIC_POL_LOW, 596 (triggering == 597 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE : 598 IOSAPIC_LEVEL); 599 } 600 601 EXPORT_SYMBOL(acpi_register_gsi); 602 603 void acpi_unregister_gsi(u32 gsi) 604 { 605 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) 606 return; 607 608 iosapic_unregister_intr(gsi); 609 } 610 611 EXPORT_SYMBOL(acpi_unregister_gsi); 612 613 static int __init acpi_parse_fadt(struct acpi_table_header *table) 614 { 615 struct acpi_table_header *fadt_header; 616 struct acpi_table_fadt *fadt; 617 618 if (!table) 619 return -EINVAL; 620 621 fadt_header = (struct acpi_table_header *)table; 622 if (fadt_header->revision != 3) 623 return -ENODEV; /* Only deal with ACPI 2.0 FADT */ 624 625 fadt = (struct acpi_table_fadt *)fadt_header; 626 627 acpi_register_gsi(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW); 628 return 0; 629 } 630 631 unsigned long __init acpi_find_rsdp(void) 632 { 633 unsigned long rsdp_phys = 0; 634 635 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 636 rsdp_phys = efi.acpi20; 637 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 638 printk(KERN_WARNING PREFIX 639 "v1.0/r0.71 tables no longer supported\n"); 640 return rsdp_phys; 641 } 642 643 int __init acpi_boot_init(void) 644 { 645 646 /* 647 * MADT 648 * ---- 649 * Parse the Multiple APIC Description Table (MADT), if exists. 650 * Note that this table provides platform SMP configuration 651 * information -- the successor to MPS tables. 652 */ 653 654 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 655 printk(KERN_ERR PREFIX "Can't find MADT\n"); 656 goto skip_madt; 657 } 658 659 /* Local APIC */ 660 661 if (acpi_table_parse_madt 662 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0) 663 printk(KERN_ERR PREFIX 664 "Error parsing LAPIC address override entry\n"); 665 666 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_lsapic, NR_CPUS) 667 < 1) 668 printk(KERN_ERR PREFIX 669 "Error parsing MADT - no LAPIC entries\n"); 670 671 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0) 672 < 0) 673 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n"); 674 675 /* I/O APIC */ 676 677 if (acpi_table_parse_madt 678 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) 679 printk(KERN_ERR PREFIX 680 "Error parsing MADT - no IOSAPIC entries\n"); 681 682 /* System-Level Interrupt Routing */ 683 684 if (acpi_table_parse_madt 685 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src, 686 ACPI_MAX_PLATFORM_INTERRUPTS) < 0) 687 printk(KERN_ERR PREFIX 688 "Error parsing platform interrupt source entry\n"); 689 690 if (acpi_table_parse_madt 691 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0) 692 printk(KERN_ERR PREFIX 693 "Error parsing interrupt source overrides entry\n"); 694 695 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0) 696 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n"); 697 skip_madt: 698 699 /* 700 * FADT says whether a legacy keyboard controller is present. 701 * The FADT also contains an SCI_INT line, by which the system 702 * gets interrupts such as power and sleep buttons. If it's not 703 * on a Legacy interrupt, it needs to be setup. 704 */ 705 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt)) 706 printk(KERN_ERR PREFIX "Can't find FADT\n"); 707 708 #ifdef CONFIG_SMP 709 if (available_cpus == 0) { 710 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n"); 711 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id()); 712 smp_boot_data.cpu_phys_id[available_cpus] = 713 hard_smp_processor_id(); 714 available_cpus = 1; /* We've got at least one of these, no? */ 715 } 716 smp_boot_data.cpu_count = available_cpus; 717 718 smp_build_cpu_map(); 719 # ifdef CONFIG_ACPI_NUMA 720 if (srat_num_cpus == 0) { 721 int cpu, i = 1; 722 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++) 723 if (smp_boot_data.cpu_phys_id[cpu] != 724 hard_smp_processor_id()) 725 node_cpuid[i++].phys_id = 726 smp_boot_data.cpu_phys_id[cpu]; 727 } 728 # endif 729 #endif 730 #ifdef CONFIG_ACPI_NUMA 731 build_cpu_to_node_map(); 732 #endif 733 /* Make boot-up look pretty */ 734 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus, 735 total_cpus); 736 return 0; 737 } 738 739 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq) 740 { 741 int vector; 742 743 if (has_8259 && gsi < 16) 744 *irq = isa_irq_to_vector(gsi); 745 else { 746 vector = gsi_to_vector(gsi); 747 if (vector == -1) 748 return -1; 749 750 *irq = vector; 751 } 752 return 0; 753 } 754 755 /* 756 * ACPI based hotplug CPU support 757 */ 758 #ifdef CONFIG_ACPI_HOTPLUG_CPU 759 static 760 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid) 761 { 762 #ifdef CONFIG_ACPI_NUMA 763 int pxm_id; 764 int nid; 765 766 pxm_id = acpi_get_pxm(handle); 767 /* 768 * We don't have cpu-only-node hotadd. But if the system equips 769 * SRAT table, pxm is already found and node is ready. 770 * So, just pxm_to_nid(pxm) is OK. 771 * This code here is for the system which doesn't have full SRAT 772 * table for possible cpus. 773 */ 774 nid = acpi_map_pxm_to_node(pxm_id); 775 node_cpuid[cpu].phys_id = physid; 776 node_cpuid[cpu].nid = nid; 777 #endif 778 return (0); 779 } 780 781 int additional_cpus __initdata = -1; 782 783 static __init int setup_additional_cpus(char *s) 784 { 785 if (s) 786 additional_cpus = simple_strtol(s, NULL, 0); 787 788 return 0; 789 } 790 791 early_param("additional_cpus", setup_additional_cpus); 792 793 /* 794 * cpu_possible_map should be static, it cannot change as cpu's 795 * are onlined, or offlined. The reason is per-cpu data-structures 796 * are allocated by some modules at init time, and dont expect to 797 * do this dynamically on cpu arrival/departure. 798 * cpu_present_map on the other hand can change dynamically. 799 * In case when cpu_hotplug is not compiled, then we resort to current 800 * behaviour, which is cpu_possible == cpu_present. 801 * - Ashok Raj 802 * 803 * Three ways to find out the number of additional hotplug CPUs: 804 * - If the BIOS specified disabled CPUs in ACPI/mptables use that. 805 * - The user can overwrite it with additional_cpus=NUM 806 * - Otherwise don't reserve additional CPUs. 807 */ 808 __init void prefill_possible_map(void) 809 { 810 int i; 811 int possible, disabled_cpus; 812 813 disabled_cpus = total_cpus - available_cpus; 814 815 if (additional_cpus == -1) { 816 if (disabled_cpus > 0) 817 additional_cpus = disabled_cpus; 818 else 819 additional_cpus = 0; 820 } 821 822 possible = available_cpus + additional_cpus; 823 824 if (possible > NR_CPUS) 825 possible = NR_CPUS; 826 827 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n", 828 possible, max((possible - available_cpus), 0)); 829 830 for (i = 0; i < possible; i++) 831 cpu_set(i, cpu_possible_map); 832 } 833 834 int acpi_map_lsapic(acpi_handle handle, int *pcpu) 835 { 836 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 837 union acpi_object *obj; 838 struct acpi_madt_local_sapic *lsapic; 839 cpumask_t tmp_map; 840 long physid; 841 int cpu; 842 843 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 844 return -EINVAL; 845 846 if (!buffer.length || !buffer.pointer) 847 return -EINVAL; 848 849 obj = buffer.pointer; 850 if (obj->type != ACPI_TYPE_BUFFER) 851 { 852 kfree(buffer.pointer); 853 return -EINVAL; 854 } 855 856 lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer; 857 858 if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) || 859 (!lsapic->lapic_flags & ACPI_MADT_ENABLED)) { 860 kfree(buffer.pointer); 861 return -EINVAL; 862 } 863 864 physid = ((lsapic->id << 8) | (lsapic->eid)); 865 866 kfree(buffer.pointer); 867 buffer.length = ACPI_ALLOCATE_BUFFER; 868 buffer.pointer = NULL; 869 870 cpus_complement(tmp_map, cpu_present_map); 871 cpu = first_cpu(tmp_map); 872 if (cpu >= NR_CPUS) 873 return -EINVAL; 874 875 acpi_map_cpu2node(handle, cpu, physid); 876 877 cpu_set(cpu, cpu_present_map); 878 ia64_cpu_to_sapicid[cpu] = physid; 879 880 *pcpu = cpu; 881 return (0); 882 } 883 884 EXPORT_SYMBOL(acpi_map_lsapic); 885 886 int acpi_unmap_lsapic(int cpu) 887 { 888 ia64_cpu_to_sapicid[cpu] = -1; 889 cpu_clear(cpu, cpu_present_map); 890 891 #ifdef CONFIG_ACPI_NUMA 892 /* NUMA specific cleanup's */ 893 #endif 894 895 return (0); 896 } 897 898 EXPORT_SYMBOL(acpi_unmap_lsapic); 899 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 900 901 #ifdef CONFIG_ACPI_NUMA 902 static acpi_status __devinit 903 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret) 904 { 905 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 906 union acpi_object *obj; 907 struct acpi_madt_io_sapic *iosapic; 908 unsigned int gsi_base; 909 int pxm, node; 910 911 /* Only care about objects w/ a method that returns the MADT */ 912 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 913 return AE_OK; 914 915 if (!buffer.length || !buffer.pointer) 916 return AE_OK; 917 918 obj = buffer.pointer; 919 if (obj->type != ACPI_TYPE_BUFFER || 920 obj->buffer.length < sizeof(*iosapic)) { 921 kfree(buffer.pointer); 922 return AE_OK; 923 } 924 925 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer; 926 927 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) { 928 kfree(buffer.pointer); 929 return AE_OK; 930 } 931 932 gsi_base = iosapic->global_irq_base; 933 934 kfree(buffer.pointer); 935 936 /* 937 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell 938 * us which node to associate this with. 939 */ 940 pxm = acpi_get_pxm(handle); 941 if (pxm < 0) 942 return AE_OK; 943 944 node = pxm_to_node(pxm); 945 946 if (node >= MAX_NUMNODES || !node_online(node) || 947 cpus_empty(node_to_cpumask(node))) 948 return AE_OK; 949 950 /* We know a gsi to node mapping! */ 951 map_iosapic_to_node(gsi_base, node); 952 return AE_OK; 953 } 954 955 static int __init 956 acpi_map_iosapics (void) 957 { 958 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL); 959 return 0; 960 } 961 962 fs_initcall(acpi_map_iosapics); 963 #endif /* CONFIG_ACPI_NUMA */ 964 965 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) 966 { 967 int err; 968 969 if ((err = iosapic_init(phys_addr, gsi_base))) 970 return err; 971 972 #ifdef CONFIG_ACPI_NUMA 973 acpi_map_iosapic(handle, 0, NULL, NULL); 974 #endif /* CONFIG_ACPI_NUMA */ 975 976 return 0; 977 } 978 979 EXPORT_SYMBOL(acpi_register_ioapic); 980 981 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base) 982 { 983 return iosapic_remove(gsi_base); 984 } 985 986 EXPORT_SYMBOL(acpi_unregister_ioapic); 987 988 #endif /* CONFIG_ACPI */ 989