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/system.h> 54 #include <asm/numa.h> 55 #include <asm/sal.h> 56 #include <asm/cyclone.h> 57 #include <asm/xen/hypervisor.h> 58 59 #define BAD_MADT_ENTRY(entry, end) ( \ 60 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \ 61 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry)) 62 63 #define PREFIX "ACPI: " 64 65 u32 acpi_rsdt_forced; 66 unsigned int acpi_cpei_override; 67 unsigned int acpi_cpei_phys_cpuid; 68 69 unsigned long acpi_wakeup_address = 0; 70 71 #ifdef CONFIG_IA64_GENERIC 72 static unsigned long __init acpi_find_rsdp(void) 73 { 74 unsigned long rsdp_phys = 0; 75 76 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) 77 rsdp_phys = efi.acpi20; 78 else if (efi.acpi != EFI_INVALID_TABLE_ADDR) 79 printk(KERN_WARNING PREFIX 80 "v1.0/r0.71 tables no longer supported\n"); 81 return rsdp_phys; 82 } 83 84 const char __init * 85 acpi_get_sysname(void) 86 { 87 unsigned long rsdp_phys; 88 struct acpi_table_rsdp *rsdp; 89 struct acpi_table_xsdt *xsdt; 90 struct acpi_table_header *hdr; 91 #ifdef CONFIG_DMAR 92 u64 i, nentries; 93 #endif 94 95 rsdp_phys = acpi_find_rsdp(); 96 if (!rsdp_phys) { 97 printk(KERN_ERR 98 "ACPI 2.0 RSDP not found, default to \"dig\"\n"); 99 return "dig"; 100 } 101 102 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys); 103 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) { 104 printk(KERN_ERR 105 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n"); 106 return "dig"; 107 } 108 109 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address); 110 hdr = &xsdt->header; 111 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) { 112 printk(KERN_ERR 113 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n"); 114 return "dig"; 115 } 116 117 if (!strcmp(hdr->oem_id, "HP")) { 118 return "hpzx1"; 119 } else if (!strcmp(hdr->oem_id, "SGI")) { 120 if (!strcmp(hdr->oem_table_id + 4, "UV")) 121 return "uv"; 122 else 123 return "sn2"; 124 } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) { 125 return "xen"; 126 } 127 128 #ifdef CONFIG_DMAR 129 /* Look for Intel IOMMU */ 130 nentries = (hdr->length - sizeof(*hdr)) / 131 sizeof(xsdt->table_offset_entry[0]); 132 for (i = 0; i < nentries; i++) { 133 hdr = __va(xsdt->table_offset_entry[i]); 134 if (strncmp(hdr->signature, ACPI_SIG_DMAR, 135 sizeof(ACPI_SIG_DMAR) - 1) == 0) 136 return "dig_vtd"; 137 } 138 #endif 139 140 return "dig"; 141 } 142 #endif /* CONFIG_IA64_GENERIC */ 143 144 #define ACPI_MAX_PLATFORM_INTERRUPTS 256 145 146 /* Array to record platform interrupt vectors for generic interrupt routing. */ 147 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = { 148 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1 149 }; 150 151 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC; 152 153 /* 154 * Interrupt routing API for device drivers. Provides interrupt vector for 155 * a generic platform event. Currently only CPEI is implemented. 156 */ 157 int acpi_request_vector(u32 int_type) 158 { 159 int vector = -1; 160 161 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) { 162 /* corrected platform error interrupt */ 163 vector = platform_intr_list[int_type]; 164 } else 165 printk(KERN_ERR 166 "acpi_request_vector(): invalid interrupt type\n"); 167 return vector; 168 } 169 170 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size) 171 { 172 return __va(phys_addr); 173 } 174 175 void __init __acpi_unmap_table(char *map, unsigned long size) 176 { 177 } 178 179 /* -------------------------------------------------------------------------- 180 Boot-time Table Parsing 181 -------------------------------------------------------------------------- */ 182 183 static int available_cpus __initdata; 184 struct acpi_table_madt *acpi_madt __initdata; 185 static u8 has_8259; 186 187 static int __init 188 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header, 189 const unsigned long end) 190 { 191 struct acpi_madt_local_apic_override *lapic; 192 193 lapic = (struct acpi_madt_local_apic_override *)header; 194 195 if (BAD_MADT_ENTRY(lapic, end)) 196 return -EINVAL; 197 198 if (lapic->address) { 199 iounmap(ipi_base_addr); 200 ipi_base_addr = ioremap(lapic->address, 0); 201 } 202 return 0; 203 } 204 205 static int __init 206 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end) 207 { 208 struct acpi_madt_local_sapic *lsapic; 209 210 lsapic = (struct acpi_madt_local_sapic *)header; 211 212 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */ 213 214 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { 215 #ifdef CONFIG_SMP 216 smp_boot_data.cpu_phys_id[available_cpus] = 217 (lsapic->id << 8) | lsapic->eid; 218 #endif 219 ++available_cpus; 220 } 221 222 total_cpus++; 223 return 0; 224 } 225 226 static int __init 227 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end) 228 { 229 struct acpi_madt_local_apic_nmi *lacpi_nmi; 230 231 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header; 232 233 if (BAD_MADT_ENTRY(lacpi_nmi, end)) 234 return -EINVAL; 235 236 /* TBD: Support lapic_nmi entries */ 237 return 0; 238 } 239 240 static int __init 241 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end) 242 { 243 struct acpi_madt_io_sapic *iosapic; 244 245 iosapic = (struct acpi_madt_io_sapic *)header; 246 247 if (BAD_MADT_ENTRY(iosapic, end)) 248 return -EINVAL; 249 250 return iosapic_init(iosapic->address, iosapic->global_irq_base); 251 } 252 253 static unsigned int __initdata acpi_madt_rev; 254 255 static int __init 256 acpi_parse_plat_int_src(struct acpi_subtable_header * header, 257 const unsigned long end) 258 { 259 struct acpi_madt_interrupt_source *plintsrc; 260 int vector; 261 262 plintsrc = (struct acpi_madt_interrupt_source *)header; 263 264 if (BAD_MADT_ENTRY(plintsrc, end)) 265 return -EINVAL; 266 267 /* 268 * Get vector assignment for this interrupt, set attributes, 269 * and program the IOSAPIC routing table. 270 */ 271 vector = iosapic_register_platform_intr(plintsrc->type, 272 plintsrc->global_irq, 273 plintsrc->io_sapic_vector, 274 plintsrc->eid, 275 plintsrc->id, 276 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) == 277 ACPI_MADT_POLARITY_ACTIVE_HIGH) ? 278 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW, 279 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) == 280 ACPI_MADT_TRIGGER_EDGE) ? 281 IOSAPIC_EDGE : IOSAPIC_LEVEL); 282 283 platform_intr_list[plintsrc->type] = vector; 284 if (acpi_madt_rev > 1) { 285 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE; 286 } 287 288 /* 289 * Save the physical id, so we can check when its being removed 290 */ 291 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff; 292 293 return 0; 294 } 295 296 #ifdef CONFIG_HOTPLUG_CPU 297 unsigned int can_cpei_retarget(void) 298 { 299 extern int cpe_vector; 300 extern unsigned int force_cpei_retarget; 301 302 /* 303 * Only if CPEI is supported and the override flag 304 * is present, otherwise return that its re-targettable 305 * if we are in polling mode. 306 */ 307 if (cpe_vector > 0) { 308 if (acpi_cpei_override || force_cpei_retarget) 309 return 1; 310 else 311 return 0; 312 } 313 return 1; 314 } 315 316 unsigned int is_cpu_cpei_target(unsigned int cpu) 317 { 318 unsigned int logical_id; 319 320 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid); 321 322 if (logical_id == cpu) 323 return 1; 324 else 325 return 0; 326 } 327 328 void set_cpei_target_cpu(unsigned int cpu) 329 { 330 acpi_cpei_phys_cpuid = cpu_physical_id(cpu); 331 } 332 #endif 333 334 unsigned int get_cpei_target_cpu(void) 335 { 336 return acpi_cpei_phys_cpuid; 337 } 338 339 static int __init 340 acpi_parse_int_src_ovr(struct acpi_subtable_header * header, 341 const unsigned long end) 342 { 343 struct acpi_madt_interrupt_override *p; 344 345 p = (struct acpi_madt_interrupt_override *)header; 346 347 if (BAD_MADT_ENTRY(p, end)) 348 return -EINVAL; 349 350 iosapic_override_isa_irq(p->source_irq, p->global_irq, 351 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) == 352 ACPI_MADT_POLARITY_ACTIVE_HIGH) ? 353 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW, 354 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) == 355 ACPI_MADT_TRIGGER_EDGE) ? 356 IOSAPIC_EDGE : IOSAPIC_LEVEL); 357 return 0; 358 } 359 360 static int __init 361 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end) 362 { 363 struct acpi_madt_nmi_source *nmi_src; 364 365 nmi_src = (struct acpi_madt_nmi_source *)header; 366 367 if (BAD_MADT_ENTRY(nmi_src, end)) 368 return -EINVAL; 369 370 /* TBD: Support nimsrc entries */ 371 return 0; 372 } 373 374 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id) 375 { 376 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) { 377 378 /* 379 * Unfortunately ITC_DRIFT is not yet part of the 380 * official SAL spec, so the ITC_DRIFT bit is not 381 * set by the BIOS on this hardware. 382 */ 383 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT; 384 385 cyclone_setup(); 386 } 387 } 388 389 static int __init acpi_parse_madt(struct acpi_table_header *table) 390 { 391 if (!table) 392 return -EINVAL; 393 394 acpi_madt = (struct acpi_table_madt *)table; 395 396 acpi_madt_rev = acpi_madt->header.revision; 397 398 /* remember the value for reference after free_initmem() */ 399 #ifdef CONFIG_ITANIUM 400 has_8259 = 1; /* Firmware on old Itanium systems is broken */ 401 #else 402 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT; 403 #endif 404 iosapic_system_init(has_8259); 405 406 /* Get base address of IPI Message Block */ 407 408 if (acpi_madt->address) 409 ipi_base_addr = ioremap(acpi_madt->address, 0); 410 411 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr); 412 413 acpi_madt_oem_check(acpi_madt->header.oem_id, 414 acpi_madt->header.oem_table_id); 415 416 return 0; 417 } 418 419 #ifdef CONFIG_ACPI_NUMA 420 421 #undef SLIT_DEBUG 422 423 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32) 424 425 static int __initdata srat_num_cpus; /* number of cpus */ 426 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN]; 427 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag)) 428 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag)) 429 static struct acpi_table_slit __initdata *slit_table; 430 cpumask_t early_cpu_possible_map = CPU_MASK_NONE; 431 432 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa) 433 { 434 int pxm; 435 436 pxm = pa->proximity_domain_lo; 437 if (ia64_platform_is("sn2")) 438 pxm += pa->proximity_domain_hi[0] << 8; 439 return pxm; 440 } 441 442 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma) 443 { 444 int pxm; 445 446 pxm = ma->proximity_domain; 447 if (!ia64_platform_is("sn2")) 448 pxm &= 0xff; 449 450 return pxm; 451 } 452 453 /* 454 * ACPI 2.0 SLIT (System Locality Information Table) 455 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf 456 */ 457 void __init acpi_numa_slit_init(struct acpi_table_slit *slit) 458 { 459 u32 len; 460 461 len = sizeof(struct acpi_table_header) + 8 462 + slit->locality_count * slit->locality_count; 463 if (slit->header.length != len) { 464 printk(KERN_ERR 465 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n", 466 len, slit->header.length); 467 return; 468 } 469 slit_table = slit; 470 } 471 472 void __init 473 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) 474 { 475 int pxm; 476 477 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED)) 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 void __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; 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 } 528 529 void __init acpi_numa_arch_fixup(void) 530 { 531 int i, j, node_from, node_to; 532 533 /* If there's no SRAT, fix the phys_id and mark node 0 online */ 534 if (srat_num_cpus == 0) { 535 node_set_online(0); 536 node_cpuid[0].phys_id = hard_smp_processor_id(); 537 return; 538 } 539 540 /* 541 * MCD - This can probably be dropped now. No need for pxm ID to node ID 542 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES. 543 */ 544 nodes_clear(node_online_map); 545 for (i = 0; i < MAX_PXM_DOMAINS; i++) { 546 if (pxm_bit_test(i)) { 547 int nid = acpi_map_pxm_to_node(i); 548 node_set_online(nid); 549 } 550 } 551 552 /* set logical node id in memory chunk structure */ 553 for (i = 0; i < num_node_memblks; i++) 554 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid); 555 556 /* assign memory bank numbers for each chunk on each node */ 557 for_each_online_node(i) { 558 int bank; 559 560 bank = 0; 561 for (j = 0; j < num_node_memblks; j++) 562 if (node_memblk[j].nid == i) 563 node_memblk[j].bank = bank++; 564 } 565 566 /* set logical node id in cpu structure */ 567 for_each_possible_early_cpu(i) 568 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid); 569 570 printk(KERN_INFO "Number of logical nodes in system = %d\n", 571 num_online_nodes()); 572 printk(KERN_INFO "Number of memory chunks in system = %d\n", 573 num_node_memblks); 574 575 if (!slit_table) { 576 for (i = 0; i < MAX_NUMNODES; i++) 577 for (j = 0; j < MAX_NUMNODES; j++) 578 node_distance(i, j) = i == j ? LOCAL_DISTANCE : 579 REMOTE_DISTANCE; 580 return; 581 } 582 583 memset(numa_slit, -1, sizeof(numa_slit)); 584 for (i = 0; i < slit_table->locality_count; i++) { 585 if (!pxm_bit_test(i)) 586 continue; 587 node_from = pxm_to_node(i); 588 for (j = 0; j < slit_table->locality_count; j++) { 589 if (!pxm_bit_test(j)) 590 continue; 591 node_to = pxm_to_node(j); 592 node_distance(node_from, node_to) = 593 slit_table->entry[i * slit_table->locality_count + j]; 594 } 595 } 596 597 #ifdef SLIT_DEBUG 598 printk("ACPI 2.0 SLIT locality table:\n"); 599 for_each_online_node(i) { 600 for_each_online_node(j) 601 printk("%03d ", node_distance(i, j)); 602 printk("\n"); 603 } 604 #endif 605 } 606 #endif /* CONFIG_ACPI_NUMA */ 607 608 /* 609 * success: return IRQ number (>=0) 610 * failure: return < 0 611 */ 612 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity) 613 { 614 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) 615 return gsi; 616 617 if (has_8259 && gsi < 16) 618 return isa_irq_to_vector(gsi); 619 620 return iosapic_register_intr(gsi, 621 (polarity == 622 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH : 623 IOSAPIC_POL_LOW, 624 (triggering == 625 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE : 626 IOSAPIC_LEVEL); 627 } 628 629 void acpi_unregister_gsi(u32 gsi) 630 { 631 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM) 632 return; 633 634 if (has_8259 && gsi < 16) 635 return; 636 637 iosapic_unregister_intr(gsi); 638 } 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 if (!table) 646 return -EINVAL; 647 648 fadt_header = (struct acpi_table_header *)table; 649 if (fadt_header->revision != 3) 650 return -ENODEV; /* Only deal with ACPI 2.0 FADT */ 651 652 fadt = (struct acpi_table_fadt *)fadt_header; 653 654 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, 655 ACPI_ACTIVE_LOW); 656 return 0; 657 } 658 659 int __init early_acpi_boot_init(void) 660 { 661 int ret; 662 663 /* 664 * do a partial walk of MADT to determine how many CPUs 665 * we have including offline CPUs 666 */ 667 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 668 printk(KERN_ERR PREFIX "Can't find MADT\n"); 669 return 0; 670 } 671 672 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, 673 acpi_parse_lsapic, NR_CPUS); 674 if (ret < 1) 675 printk(KERN_ERR PREFIX 676 "Error parsing MADT - no LAPIC entries\n"); 677 678 #ifdef CONFIG_SMP 679 if (available_cpus == 0) { 680 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n"); 681 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id()); 682 smp_boot_data.cpu_phys_id[available_cpus] = 683 hard_smp_processor_id(); 684 available_cpus = 1; /* We've got at least one of these, no? */ 685 } 686 smp_boot_data.cpu_count = available_cpus; 687 #endif 688 /* Make boot-up look pretty */ 689 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus, 690 total_cpus); 691 692 return 0; 693 } 694 695 int __init acpi_boot_init(void) 696 { 697 698 /* 699 * MADT 700 * ---- 701 * Parse the Multiple APIC Description Table (MADT), if exists. 702 * Note that this table provides platform SMP configuration 703 * information -- the successor to MPS tables. 704 */ 705 706 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) { 707 printk(KERN_ERR PREFIX "Can't find MADT\n"); 708 goto skip_madt; 709 } 710 711 /* Local APIC */ 712 713 if (acpi_table_parse_madt 714 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0) 715 printk(KERN_ERR PREFIX 716 "Error parsing LAPIC address override entry\n"); 717 718 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0) 719 < 0) 720 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n"); 721 722 /* I/O APIC */ 723 724 if (acpi_table_parse_madt 725 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) { 726 if (!ia64_platform_is("sn2")) 727 printk(KERN_ERR PREFIX 728 "Error parsing MADT - no IOSAPIC entries\n"); 729 } 730 731 /* System-Level Interrupt Routing */ 732 733 if (acpi_table_parse_madt 734 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src, 735 ACPI_MAX_PLATFORM_INTERRUPTS) < 0) 736 printk(KERN_ERR PREFIX 737 "Error parsing platform interrupt source entry\n"); 738 739 if (acpi_table_parse_madt 740 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0) 741 printk(KERN_ERR PREFIX 742 "Error parsing interrupt source overrides entry\n"); 743 744 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0) 745 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n"); 746 skip_madt: 747 748 /* 749 * FADT says whether a legacy keyboard controller is present. 750 * The FADT also contains an SCI_INT line, by which the system 751 * gets interrupts such as power and sleep buttons. If it's not 752 * on a Legacy interrupt, it needs to be setup. 753 */ 754 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt)) 755 printk(KERN_ERR PREFIX "Can't find FADT\n"); 756 757 #ifdef CONFIG_ACPI_NUMA 758 #ifdef CONFIG_SMP 759 if (srat_num_cpus == 0) { 760 int cpu, i = 1; 761 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++) 762 if (smp_boot_data.cpu_phys_id[cpu] != 763 hard_smp_processor_id()) 764 node_cpuid[i++].phys_id = 765 smp_boot_data.cpu_phys_id[cpu]; 766 } 767 #endif 768 build_cpu_to_node_map(); 769 #endif 770 return 0; 771 } 772 773 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq) 774 { 775 int tmp; 776 777 if (has_8259 && gsi < 16) 778 *irq = isa_irq_to_vector(gsi); 779 else { 780 tmp = gsi_to_irq(gsi); 781 if (tmp == -1) 782 return -1; 783 *irq = tmp; 784 } 785 return 0; 786 } 787 788 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi) 789 { 790 if (isa_irq >= 16) 791 return -1; 792 *gsi = isa_irq; 793 return 0; 794 } 795 796 /* 797 * ACPI based hotplug CPU support 798 */ 799 #ifdef CONFIG_ACPI_HOTPLUG_CPU 800 static 801 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 802 { 803 #ifdef CONFIG_ACPI_NUMA 804 int pxm_id; 805 int nid; 806 807 pxm_id = acpi_get_pxm(handle); 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 nid = acpi_map_pxm_to_node(pxm_id); 816 node_cpuid[cpu].phys_id = physid; 817 node_cpuid[cpu].nid = nid; 818 #endif 819 return (0); 820 } 821 822 int additional_cpus __initdata = -1; 823 824 static __init int setup_additional_cpus(char *s) 825 { 826 if (s) 827 additional_cpus = simple_strtol(s, NULL, 0); 828 829 return 0; 830 } 831 832 early_param("additional_cpus", setup_additional_cpus); 833 834 /* 835 * cpu_possible_map should be static, it cannot change as CPUs 836 * are onlined, or offlined. The reason is per-cpu data-structures 837 * are allocated by some modules at init time, and dont expect to 838 * do this dynamically on cpu arrival/departure. 839 * cpu_present_map on the other hand can change dynamically. 840 * In case when cpu_hotplug is not compiled, then we resort to current 841 * behaviour, which is cpu_possible == cpu_present. 842 * - Ashok Raj 843 * 844 * Three ways to find out the number of additional hotplug CPUs: 845 * - If the BIOS specified disabled CPUs in ACPI/mptables use that. 846 * - The user can overwrite it with additional_cpus=NUM 847 * - Otherwise don't reserve additional CPUs. 848 */ 849 __init void prefill_possible_map(void) 850 { 851 int i; 852 int possible, disabled_cpus; 853 854 disabled_cpus = total_cpus - available_cpus; 855 856 if (additional_cpus == -1) { 857 if (disabled_cpus > 0) 858 additional_cpus = disabled_cpus; 859 else 860 additional_cpus = 0; 861 } 862 863 possible = available_cpus + additional_cpus; 864 865 if (possible > nr_cpu_ids) 866 possible = nr_cpu_ids; 867 868 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n", 869 possible, max((possible - available_cpus), 0)); 870 871 for (i = 0; i < possible; i++) 872 set_cpu_possible(i, true); 873 } 874 875 int acpi_map_lsapic(acpi_handle handle, int *pcpu) 876 { 877 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 878 union acpi_object *obj; 879 struct acpi_madt_local_sapic *lsapic; 880 cpumask_t tmp_map; 881 int cpu, physid; 882 883 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 884 return -EINVAL; 885 886 if (!buffer.length || !buffer.pointer) 887 return -EINVAL; 888 889 obj = buffer.pointer; 890 if (obj->type != ACPI_TYPE_BUFFER) 891 { 892 kfree(buffer.pointer); 893 return -EINVAL; 894 } 895 896 lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer; 897 898 if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) || 899 (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) { 900 kfree(buffer.pointer); 901 return -EINVAL; 902 } 903 904 physid = ((lsapic->id << 8) | (lsapic->eid)); 905 906 kfree(buffer.pointer); 907 buffer.length = ACPI_ALLOCATE_BUFFER; 908 buffer.pointer = NULL; 909 910 cpumask_complement(&tmp_map, cpu_present_mask); 911 cpu = cpumask_first(&tmp_map); 912 if (cpu >= nr_cpu_ids) 913 return -EINVAL; 914 915 acpi_map_cpu2node(handle, cpu, physid); 916 917 cpu_set(cpu, cpu_present_map); 918 ia64_cpu_to_sapicid[cpu] = physid; 919 920 acpi_processor_set_pdc(handle); 921 922 *pcpu = cpu; 923 return (0); 924 } 925 926 EXPORT_SYMBOL(acpi_map_lsapic); 927 928 int acpi_unmap_lsapic(int cpu) 929 { 930 ia64_cpu_to_sapicid[cpu] = -1; 931 cpu_clear(cpu, cpu_present_map); 932 933 #ifdef CONFIG_ACPI_NUMA 934 /* NUMA specific cleanup's */ 935 #endif 936 937 return (0); 938 } 939 940 EXPORT_SYMBOL(acpi_unmap_lsapic); 941 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 942 943 #ifdef CONFIG_ACPI_NUMA 944 static acpi_status __devinit 945 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret) 946 { 947 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 948 union acpi_object *obj; 949 struct acpi_madt_io_sapic *iosapic; 950 unsigned int gsi_base; 951 int pxm, node; 952 953 /* Only care about objects w/ a method that returns the MADT */ 954 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 955 return AE_OK; 956 957 if (!buffer.length || !buffer.pointer) 958 return AE_OK; 959 960 obj = buffer.pointer; 961 if (obj->type != ACPI_TYPE_BUFFER || 962 obj->buffer.length < sizeof(*iosapic)) { 963 kfree(buffer.pointer); 964 return AE_OK; 965 } 966 967 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer; 968 969 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) { 970 kfree(buffer.pointer); 971 return AE_OK; 972 } 973 974 gsi_base = iosapic->global_irq_base; 975 976 kfree(buffer.pointer); 977 978 /* 979 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell 980 * us which node to associate this with. 981 */ 982 pxm = acpi_get_pxm(handle); 983 if (pxm < 0) 984 return AE_OK; 985 986 node = pxm_to_node(pxm); 987 988 if (node >= MAX_NUMNODES || !node_online(node) || 989 cpumask_empty(cpumask_of_node(node))) 990 return AE_OK; 991 992 /* We know a gsi to node mapping! */ 993 map_iosapic_to_node(gsi_base, node); 994 return AE_OK; 995 } 996 997 static int __init 998 acpi_map_iosapics (void) 999 { 1000 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL); 1001 return 0; 1002 } 1003 1004 fs_initcall(acpi_map_iosapics); 1005 #endif /* CONFIG_ACPI_NUMA */ 1006 1007 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) 1008 { 1009 int err; 1010 1011 if ((err = iosapic_init(phys_addr, gsi_base))) 1012 return err; 1013 1014 #ifdef CONFIG_ACPI_NUMA 1015 acpi_map_iosapic(handle, 0, NULL, NULL); 1016 #endif /* CONFIG_ACPI_NUMA */ 1017 1018 return 0; 1019 } 1020 1021 EXPORT_SYMBOL(acpi_register_ioapic); 1022 1023 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base) 1024 { 1025 return iosapic_remove(gsi_base); 1026 } 1027 1028 EXPORT_SYMBOL(acpi_unregister_ioapic); 1029 1030 /* 1031 * acpi_save_state_mem() - save kernel state 1032 * 1033 * TBD when when IA64 starts to support suspend... 1034 */ 1035 int acpi_save_state_mem(void) { return 0; } 1036 1037 /* 1038 * acpi_restore_state() 1039 */ 1040 void acpi_restore_state_mem(void) {} 1041 1042 /* 1043 * do_suspend_lowlevel() 1044 */ 1045 void do_suspend_lowlevel(void) {} 1046