arch/ia64/kernel/acpi.c

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