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 if (!table) 384 return -EINVAL; 385 386 acpi_madt = (struct acpi_table_madt *)table; 387 388 acpi_madt_rev = acpi_madt->header.revision; 389 390 /* remember the value for reference after free_initmem() */ 391 #ifdef CONFIG_ITANIUM 392 has_8259 = 1; /* Firmware on old Itanium systems is broken */ 393 #else 394 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT; 395 #endif 396 iosapic_system_init(has_8259); 397 398 /* Get base address of IPI Message Block */ 399 400 if (acpi_madt->address) 401 ipi_base_addr = ioremap(acpi_madt->address, 0); 402 403 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr); 404 405 acpi_madt_oem_check(acpi_madt->header.oem_id, 406 acpi_madt->header.oem_table_id); 407 408 return 0; 409 } 410 411 #ifdef CONFIG_ACPI_NUMA 412 413 #undef SLIT_DEBUG 414 415 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32) 416 417 static int __initdata srat_num_cpus; /* number of cpus */ 418 static u32 pxm_flag[PXM_FLAG_LEN]; 419 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag)) 420 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag)) 421 static struct acpi_table_slit __initdata *slit_table; 422 cpumask_t early_cpu_possible_map = CPU_MASK_NONE; 423 424 static int __init 425 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa) 426 { 427 int pxm; 428 429 pxm = pa->proximity_domain_lo; 430 if (ia64_platform_is("sn2") || acpi_srat_revision >= 2) 431 pxm += pa->proximity_domain_hi[0] << 8; 432 return pxm; 433 } 434 435 static int __init 436 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma) 437 { 438 int pxm; 439 440 pxm = ma->proximity_domain; 441 if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1) 442 pxm &= 0xff; 443 444 return pxm; 445 } 446 447 /* 448 * ACPI 2.0 SLIT (System Locality Information Table) 449 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf 450 */ 451 void __init acpi_numa_slit_init(struct acpi_table_slit *slit) 452 { 453 u32 len; 454 455 len = sizeof(struct acpi_table_header) + 8 456 + slit->locality_count * slit->locality_count; 457 if (slit->header.length != len) { 458 printk(KERN_ERR 459 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n", 460 len, slit->header.length); 461 return; 462 } 463 slit_table = slit; 464 } 465 466 void __init 467 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 468 { 469 int pxm; 470 471 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED)) 472 return; 473 474 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) { 475 printk_once(KERN_WARNING 476 "node_cpuid[%ld] is too small, may not be able to use all cpus\n", 477 ARRAY_SIZE(node_cpuid)); 478 return; 479 } 480 pxm = get_processor_proximity_domain(pa); 481 482 /* record this node in proximity bitmap */ 483 pxm_bit_set(pxm); 484 485 node_cpuid[srat_num_cpus].phys_id = 486 (pa->apic_id << 8) | (pa->local_sapic_eid); 487 /* nid should be overridden as logical node id later */ 488 node_cpuid[srat_num_cpus].nid = pxm; 489 cpu_set(srat_num_cpus, early_cpu_possible_map); 490 srat_num_cpus++; 491 } 492 493 int __init 494 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma) 495 { 496 unsigned long paddr, size; 497 int pxm; 498 struct node_memblk_s *p, *q, *pend; 499 500 pxm = get_memory_proximity_domain(ma); 501 502 /* fill node memory chunk structure */ 503 paddr = ma->base_address; 504 size = ma->length; 505 506 /* Ignore disabled entries */ 507 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED)) 508 return -1; 509 510 /* record this node in proximity bitmap */ 511 pxm_bit_set(pxm); 512 513 /* Insertion sort based on base address */ 514 pend = &node_memblk[num_node_memblks]; 515 for (p = &node_memblk[0]; p < pend; p++) { 516 if (paddr < p->start_paddr) 517 break; 518 } 519 if (p < pend) { 520 for (q = pend - 1; q >= p; q--) 521 *(q + 1) = *q; 522 } 523 p->start_paddr = paddr; 524 p->size = size; 525 p->nid = pxm; 526 num_node_memblks++; 527 return 0; 528 } 529 530 void __init acpi_numa_arch_fixup(void) 531 { 532 int i, j, node_from, node_to; 533 534 /* If there's no SRAT, fix the phys_id and mark node 0 online */ 535 if (srat_num_cpus == 0) { 536 node_set_online(0); 537 node_cpuid[0].phys_id = hard_smp_processor_id(); 538 return; 539 } 540 541 /* 542 * MCD - This can probably be dropped now. No need for pxm ID to node ID 543 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES. 544 */ 545 nodes_clear(node_online_map); 546 for (i = 0; i < MAX_PXM_DOMAINS; i++) { 547 if (pxm_bit_test(i)) { 548 int nid = acpi_map_pxm_to_node(i); 549 node_set_online(nid); 550 } 551 } 552 553 /* set logical node id in memory chunk structure */ 554 for (i = 0; i < num_node_memblks; i++) 555 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid); 556 557 /* assign memory bank numbers for each chunk on each node */ 558 for_each_online_node(i) { 559 int bank; 560 561 bank = 0; 562 for (j = 0; j < num_node_memblks; j++) 563 if (node_memblk[j].nid == i) 564 node_memblk[j].bank = bank++; 565 } 566 567 /* set logical node id in cpu structure */ 568 for_each_possible_early_cpu(i) 569 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid); 570 571 printk(KERN_INFO "Number of logical nodes in system = %d\n", 572 num_online_nodes()); 573 printk(KERN_INFO "Number of memory chunks in system = %d\n", 574 num_node_memblks); 575 576 if (!slit_table) { 577 for (i = 0; i < MAX_NUMNODES; i++) 578 for (j = 0; j < MAX_NUMNODES; j++) 579 node_distance(i, j) = i == j ? LOCAL_DISTANCE : 580 REMOTE_DISTANCE; 581 return; 582 } 583 584 memset(numa_slit, -1, sizeof(numa_slit)); 585 for (i = 0; i < slit_table->locality_count; i++) { 586 if (!pxm_bit_test(i)) 587 continue; 588 node_from = pxm_to_node(i); 589 for (j = 0; j < slit_table->locality_count; j++) { 590 if (!pxm_bit_test(j)) 591 continue; 592 node_to = pxm_to_node(j); 593 node_distance(node_from, node_to) = 594 slit_table->entry[i * slit_table->locality_count + j]; 595 } 596 } 597 598 #ifdef SLIT_DEBUG 599 printk("ACPI 2.0 SLIT locality table:\n"); 600 for_each_online_node(i) { 601 for_each_online_node(j) 602 printk("%03d ", node_distance(i, j)); 603 printk("\n"); 604 } 605 #endif 606 } 607 #endif /* CONFIG_ACPI_NUMA */ 608 609 /* 610 * success: return IRQ number (>=0) 611 * failure: return < 0 612 */ 613 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity) 614 { 615 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) 616 return gsi; 617 618 if (has_8259 && gsi < 16) 619 return isa_irq_to_vector(gsi); 620 621 return iosapic_register_intr(gsi, 622 (polarity == 623 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH : 624 IOSAPIC_POL_LOW, 625 (triggering == 626 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE : 627 IOSAPIC_LEVEL); 628 } 629 EXPORT_SYMBOL_GPL(acpi_register_gsi); 630 631 void acpi_unregister_gsi(u32 gsi) 632 { 633 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) 634 return; 635 636 if (has_8259 && gsi < 16) 637 return; 638 639 iosapic_unregister_intr(gsi); 640 } 641 EXPORT_SYMBOL_GPL(acpi_unregister_gsi); 642 643 static int __init acpi_parse_fadt(struct acpi_table_header *table) 644 { 645 struct acpi_table_header *fadt_header; 646 struct acpi_table_fadt *fadt; 647 648 if (!table) 649 return -EINVAL; 650 651 fadt_header = (struct acpi_table_header *)table; 652 if (fadt_header->revision != 3) 653 return -ENODEV; /* Only deal with ACPI 2.0 FADT */ 654 655 fadt = (struct acpi_table_fadt *)fadt_header; 656 657 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, 658 ACPI_ACTIVE_LOW); 659 return 0; 660 } 661 662 int __init early_acpi_boot_init(void) 663 { 664 int ret; 665 666 /* 667 * do a partial walk of MADT to determine how many CPUs 668 * we have including offline CPUs 669 */ 670 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 671 printk(KERN_ERR PREFIX "Can't find MADT\n"); 672 return 0; 673 } 674 675 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, 676 acpi_parse_lsapic, NR_CPUS); 677 if (ret < 1) 678 printk(KERN_ERR PREFIX 679 "Error parsing MADT - no LAPIC entries\n"); 680 else 681 acpi_lapic = 1; 682 683 #ifdef CONFIG_SMP 684 if (available_cpus == 0) { 685 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n"); 686 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id()); 687 smp_boot_data.cpu_phys_id[available_cpus] = 688 hard_smp_processor_id(); 689 available_cpus = 1; /* We've got at least one of these, no? */ 690 } 691 smp_boot_data.cpu_count = available_cpus; 692 #endif 693 /* Make boot-up look pretty */ 694 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus, 695 total_cpus); 696 697 return 0; 698 } 699 700 int __init acpi_boot_init(void) 701 { 702 703 /* 704 * MADT 705 * ---- 706 * Parse the Multiple APIC Description Table (MADT), if exists. 707 * Note that this table provides platform SMP configuration 708 * information -- the successor to MPS tables. 709 */ 710 711 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 712 printk(KERN_ERR PREFIX "Can't find MADT\n"); 713 goto skip_madt; 714 } 715 716 /* Local APIC */ 717 718 if (acpi_table_parse_madt 719 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0) 720 printk(KERN_ERR PREFIX 721 "Error parsing LAPIC address override entry\n"); 722 723 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0) 724 < 0) 725 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n"); 726 727 /* I/O APIC */ 728 729 if (acpi_table_parse_madt 730 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) { 731 if (!ia64_platform_is("sn2")) 732 printk(KERN_ERR PREFIX 733 "Error parsing MADT - no IOSAPIC entries\n"); 734 } 735 736 /* System-Level Interrupt Routing */ 737 738 if (acpi_table_parse_madt 739 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src, 740 ACPI_MAX_PLATFORM_INTERRUPTS) < 0) 741 printk(KERN_ERR PREFIX 742 "Error parsing platform interrupt source entry\n"); 743 744 if (acpi_table_parse_madt 745 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0) 746 printk(KERN_ERR PREFIX 747 "Error parsing interrupt source overrides entry\n"); 748 749 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0) 750 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n"); 751 skip_madt: 752 753 /* 754 * FADT says whether a legacy keyboard controller is present. 755 * The FADT also contains an SCI_INT line, by which the system 756 * gets interrupts such as power and sleep buttons. If it's not 757 * on a Legacy interrupt, it needs to be setup. 758 */ 759 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt)) 760 printk(KERN_ERR PREFIX "Can't find FADT\n"); 761 762 #ifdef CONFIG_ACPI_NUMA 763 #ifdef CONFIG_SMP 764 if (srat_num_cpus == 0) { 765 int cpu, i = 1; 766 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++) 767 if (smp_boot_data.cpu_phys_id[cpu] != 768 hard_smp_processor_id()) 769 node_cpuid[i++].phys_id = 770 smp_boot_data.cpu_phys_id[cpu]; 771 } 772 #endif 773 build_cpu_to_node_map(); 774 #endif 775 return 0; 776 } 777 778 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq) 779 { 780 int tmp; 781 782 if (has_8259 && gsi < 16) 783 *irq = isa_irq_to_vector(gsi); 784 else { 785 tmp = gsi_to_irq(gsi); 786 if (tmp == -1) 787 return -1; 788 *irq = tmp; 789 } 790 return 0; 791 } 792 793 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi) 794 { 795 if (isa_irq >= 16) 796 return -1; 797 *gsi = isa_irq; 798 return 0; 799 } 800 801 /* 802 * ACPI based hotplug CPU support 803 */ 804 #ifdef CONFIG_ACPI_HOTPLUG_CPU 805 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 806 { 807 #ifdef CONFIG_ACPI_NUMA 808 /* 809 * We don't have cpu-only-node hotadd. But if the system equips 810 * SRAT table, pxm is already found and node is ready. 811 * So, just pxm_to_nid(pxm) is OK. 812 * This code here is for the system which doesn't have full SRAT 813 * table for possible cpus. 814 */ 815 node_cpuid[cpu].phys_id = physid; 816 node_cpuid[cpu].nid = acpi_get_node(handle); 817 #endif 818 return 0; 819 } 820 821 int additional_cpus __initdata = -1; 822 823 static __init int setup_additional_cpus(char *s) 824 { 825 if (s) 826 additional_cpus = simple_strtol(s, NULL, 0); 827 828 return 0; 829 } 830 831 early_param("additional_cpus", setup_additional_cpus); 832 833 /* 834 * cpu_possible_mask should be static, it cannot change as CPUs 835 * are onlined, or offlined. The reason is per-cpu data-structures 836 * are allocated by some modules at init time, and dont expect to 837 * do this dynamically on cpu arrival/departure. 838 * cpu_present_mask on the other hand can change dynamically. 839 * In case when cpu_hotplug is not compiled, then we resort to current 840 * behaviour, which is cpu_possible == cpu_present. 841 * - Ashok Raj 842 * 843 * Three ways to find out the number of additional hotplug CPUs: 844 * - If the BIOS specified disabled CPUs in ACPI/mptables use that. 845 * - The user can overwrite it with additional_cpus=NUM 846 * - Otherwise don't reserve additional CPUs. 847 */ 848 __init void prefill_possible_map(void) 849 { 850 int i; 851 int possible, disabled_cpus; 852 853 disabled_cpus = total_cpus - available_cpus; 854 855 if (additional_cpus == -1) { 856 if (disabled_cpus > 0) 857 additional_cpus = disabled_cpus; 858 else 859 additional_cpus = 0; 860 } 861 862 possible = available_cpus + additional_cpus; 863 864 if (possible > nr_cpu_ids) 865 possible = nr_cpu_ids; 866 867 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n", 868 possible, max((possible - available_cpus), 0)); 869 870 for (i = 0; i < possible; i++) 871 set_cpu_possible(i, true); 872 } 873 874 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu) 875 { 876 cpumask_t tmp_map; 877 int cpu; 878 879 cpumask_complement(&tmp_map, cpu_present_mask); 880 cpu = cpumask_first(&tmp_map); 881 if (cpu >= nr_cpu_ids) 882 return -EINVAL; 883 884 acpi_map_cpu2node(handle, cpu, physid); 885 886 set_cpu_present(cpu, true); 887 ia64_cpu_to_sapicid[cpu] = physid; 888 889 acpi_processor_set_pdc(handle); 890 891 *pcpu = cpu; 892 return (0); 893 } 894 895 /* wrapper to silence section mismatch warning */ 896 int __ref acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu) 897 { 898 return _acpi_map_lsapic(handle, physid, pcpu); 899 } 900 EXPORT_SYMBOL(acpi_map_lsapic); 901 902 int acpi_unmap_lsapic(int cpu) 903 { 904 ia64_cpu_to_sapicid[cpu] = -1; 905 set_cpu_present(cpu, false); 906 907 #ifdef CONFIG_ACPI_NUMA 908 /* NUMA specific cleanup's */ 909 #endif 910 911 return (0); 912 } 913 914 EXPORT_SYMBOL(acpi_unmap_lsapic); 915 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 916 917 #ifdef CONFIG_ACPI_NUMA 918 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth, 919 void *context, void **ret) 920 { 921 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 922 union acpi_object *obj; 923 struct acpi_madt_io_sapic *iosapic; 924 unsigned int gsi_base; 925 int node; 926 927 /* Only care about objects w/ a method that returns the MADT */ 928 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 929 return AE_OK; 930 931 if (!buffer.length || !buffer.pointer) 932 return AE_OK; 933 934 obj = buffer.pointer; 935 if (obj->type != ACPI_TYPE_BUFFER || 936 obj->buffer.length < sizeof(*iosapic)) { 937 kfree(buffer.pointer); 938 return AE_OK; 939 } 940 941 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer; 942 943 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) { 944 kfree(buffer.pointer); 945 return AE_OK; 946 } 947 948 gsi_base = iosapic->global_irq_base; 949 950 kfree(buffer.pointer); 951 952 /* OK, it's an IOSAPIC MADT entry; associate it with a node */ 953 node = acpi_get_node(handle); 954 if (node == NUMA_NO_NODE || !node_online(node) || 955 cpumask_empty(cpumask_of_node(node))) 956 return AE_OK; 957 958 /* We know a gsi to node mapping! */ 959 map_iosapic_to_node(gsi_base, node); 960 return AE_OK; 961 } 962 963 static int __init 964 acpi_map_iosapics (void) 965 { 966 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL); 967 return 0; 968 } 969 970 fs_initcall(acpi_map_iosapics); 971 #endif /* CONFIG_ACPI_NUMA */ 972 973 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) 974 { 975 int err; 976 977 if ((err = iosapic_init(phys_addr, gsi_base))) 978 return err; 979 980 #ifdef CONFIG_ACPI_NUMA 981 acpi_map_iosapic(handle, 0, NULL, NULL); 982 #endif /* CONFIG_ACPI_NUMA */ 983 984 return 0; 985 } 986 987 EXPORT_SYMBOL(acpi_register_ioapic); 988 989 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base) 990 { 991 return iosapic_remove(gsi_base); 992 } 993 994 EXPORT_SYMBOL(acpi_unregister_ioapic); 995 996 /* 997 * acpi_suspend_lowlevel() - save kernel state and suspend. 998 * 999 * TBD when when IA64 starts to support suspend... 1000 */ 1001 int acpi_suspend_lowlevel(void) { return 0; } 1002