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