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 unsigned long acpi_wakeup_address = 0;
  46
  47 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
  48
  49 /* Array to record platform interrupt vectors for generic interrupt routing. */
  50 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
  51         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
  52 };
  53
  54 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
  55
  56 /*
  57  * Interrupt routing API for device drivers.  Provides interrupt vector for
  58  * a generic platform event.  Currently only CPEI is implemented.
  59  */
  60 int acpi_request_vector(u32 int_type)
  61 {
  62         int vector = -1;
  63
  64         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
  65                 /* corrected platform error interrupt */
  66                 vector = platform_intr_list[int_type];
  67         } else
  68                 printk(KERN_ERR
  69                        "acpi_request_vector(): invalid interrupt type\n");
  70         return vector;
  71 }
  72
  73 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
  74 {
  75         return __va(phys);
  76 }
  77
  78 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
  79 {
  80 }
  81
  82 /* --------------------------------------------------------------------------
  83                             Boot-time Table Parsing
  84    -------------------------------------------------------------------------- */
  85
  86 static int available_cpus __initdata;
  87 struct acpi_table_madt *acpi_madt __initdata;
  88 static u8 has_8259;
  89
  90 static int __init
  91 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
  92                           const unsigned long end)
  93 {
  94         struct acpi_madt_local_apic_override *lapic;
  95
  96         lapic = (struct acpi_madt_local_apic_override *)header;
  97
  98         if (BAD_MADT_ENTRY(lapic, end))
  99                 return -EINVAL;
 100
 101         if (lapic->address) {
 102                 iounmap(ipi_base_addr);
 103                 ipi_base_addr = ioremap(lapic->address, 0);
 104         }
 105         return 0;
 106 }
 107
 108 static int __init
 109 acpi_parse_lsapic(union acpi_subtable_headers *header, const unsigned long end)
 110 {
 111         struct acpi_madt_local_sapic *lsapic;
 112
 113         lsapic = (struct acpi_madt_local_sapic *)header;
 114
 115         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 116
 117         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 118 #ifdef CONFIG_SMP
 119                 smp_boot_data.cpu_phys_id[available_cpus] =
 120                     (lsapic->id << 8) | lsapic->eid;
 121 #endif
 122                 ++available_cpus;
 123         }
 124
 125         total_cpus++;
 126         return 0;
 127 }
 128
 129 static int __init
 130 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
 131 {
 132         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 133
 134         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 135
 136         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 137                 return -EINVAL;
 138
 139         /* TBD: Support lapic_nmi entries */
 140         return 0;
 141 }
 142
 143 static int __init
 144 acpi_parse_iosapic(union acpi_subtable_headers * header, const unsigned long end)
 145 {
 146         struct acpi_madt_io_sapic *iosapic;
 147
 148         iosapic = (struct acpi_madt_io_sapic *)header;
 149
 150         if (BAD_MADT_ENTRY(iosapic, end))
 151                 return -EINVAL;
 152
 153         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 154 }
 155
 156 static unsigned int __initdata acpi_madt_rev;
 157
 158 static int __init
 159 acpi_parse_plat_int_src(union acpi_subtable_headers * header,
 160                         const unsigned long end)
 161 {
 162         struct acpi_madt_interrupt_source *plintsrc;
 163         int vector;
 164
 165         plintsrc = (struct acpi_madt_interrupt_source *)header;
 166
 167         if (BAD_MADT_ENTRY(plintsrc, end))
 168                 return -EINVAL;
 169
 170         /*
 171          * Get vector assignment for this interrupt, set attributes,
 172          * and program the IOSAPIC routing table.
 173          */
 174         vector = iosapic_register_platform_intr(plintsrc->type,
 175                                                 plintsrc->global_irq,
 176                                                 plintsrc->io_sapic_vector,
 177                                                 plintsrc->eid,
 178                                                 plintsrc->id,
 179                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 180                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 181                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 182                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 183                                                  ACPI_MADT_TRIGGER_EDGE) ?
 184                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 185
 186         platform_intr_list[plintsrc->type] = vector;
 187         if (acpi_madt_rev > 1) {
 188                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 189         }
 190
 191         /*
 192          * Save the physical id, so we can check when its being removed
 193          */
 194         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 195
 196         return 0;
 197 }
 198
 199 #ifdef CONFIG_HOTPLUG_CPU
 200 unsigned int can_cpei_retarget(void)
 201 {
 202         extern int cpe_vector;
 203         extern unsigned int force_cpei_retarget;
 204
 205         /*
 206          * Only if CPEI is supported and the override flag
 207          * is present, otherwise return that its re-targettable
 208          * if we are in polling mode.
 209          */
 210         if (cpe_vector > 0) {
 211                 if (acpi_cpei_override || force_cpei_retarget)
 212                         return 1;
 213                 else
 214                         return 0;
 215         }
 216         return 1;
 217 }
 218
 219 unsigned int is_cpu_cpei_target(unsigned int cpu)
 220 {
 221         unsigned int logical_id;
 222
 223         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 224
 225         if (logical_id == cpu)
 226                 return 1;
 227         else
 228                 return 0;
 229 }
 230
 231 void set_cpei_target_cpu(unsigned int cpu)
 232 {
 233         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 234 }
 235 #endif
 236
 237 unsigned int get_cpei_target_cpu(void)
 238 {
 239         return acpi_cpei_phys_cpuid;
 240 }
 241
 242 static int __init
 243 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
 244                        const unsigned long end)
 245 {
 246         struct acpi_madt_interrupt_override *p;
 247
 248         p = (struct acpi_madt_interrupt_override *)header;
 249
 250         if (BAD_MADT_ENTRY(p, end))
 251                 return -EINVAL;
 252
 253         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 254                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 255                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
 256                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
 257                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 258                                  ACPI_MADT_TRIGGER_LEVEL) ?
 259                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
 260         return 0;
 261 }
 262
 263 static int __init
 264 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
 265 {
 266         struct acpi_madt_nmi_source *nmi_src;
 267
 268         nmi_src = (struct acpi_madt_nmi_source *)header;
 269
 270         if (BAD_MADT_ENTRY(nmi_src, end))
 271                 return -EINVAL;
 272
 273         /* TBD: Support nimsrc entries */
 274         return 0;
 275 }
 276
 277 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 278 {
 279         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 280
 281                 /*
 282                  * Unfortunately ITC_DRIFT is not yet part of the
 283                  * official SAL spec, so the ITC_DRIFT bit is not
 284                  * set by the BIOS on this hardware.
 285                  */
 286                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 287
 288                 cyclone_setup();
 289         }
 290 }
 291
 292 static int __init acpi_parse_madt(struct acpi_table_header *table)
 293 {
 294         acpi_madt = (struct acpi_table_madt *)table;
 295
 296         acpi_madt_rev = acpi_madt->header.revision;
 297
 298         /* remember the value for reference after free_initmem() */
 299 #ifdef CONFIG_ITANIUM
 300         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 301 #else
 302         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 303 #endif
 304         iosapic_system_init(has_8259);
 305
 306         /* Get base address of IPI Message Block */
 307
 308         if (acpi_madt->address)
 309                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 310
 311         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 312
 313         acpi_madt_oem_check(acpi_madt->header.oem_id,
 314                             acpi_madt->header.oem_table_id);
 315
 316         return 0;
 317 }
 318
 319 #ifdef CONFIG_ACPI_NUMA
 320
 321 #undef SLIT_DEBUG
 322
 323 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 324
 325 static int __initdata srat_num_cpus;    /* number of cpus */
 326 static u32 pxm_flag[PXM_FLAG_LEN];
 327 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 328 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 329 static struct acpi_table_slit __initdata *slit_table;
 330 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 331
 332 static int __init
 333 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 334 {
 335         int pxm;
 336
 337         pxm = pa->proximity_domain_lo;
 338         if (acpi_srat_revision >= 2)
 339                 pxm += pa->proximity_domain_hi[0] << 8;
 340         return pxm;
 341 }
 342
 343 static int __init
 344 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 345 {
 346         int pxm;
 347
 348         pxm = ma->proximity_domain;
 349         if (acpi_srat_revision <= 1)
 350                 pxm &= 0xff;
 351
 352         return pxm;
 353 }
 354
 355 /*
 356  * ACPI 2.0 SLIT (System Locality Information Table)
 357  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 358  */
 359 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 360 {
 361         u32 len;
 362
 363         len = sizeof(struct acpi_table_header) + 8
 364             + slit->locality_count * slit->locality_count;
 365         if (slit->header.length != len) {
 366                 printk(KERN_ERR
 367                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 368                        len, slit->header.length);
 369                 return;
 370         }
 371         slit_table = slit;
 372 }
 373
 374 void __init
 375 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 376 {
 377         int pxm;
 378
 379         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 380                 return;
 381
 382         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
 383                 printk_once(KERN_WARNING
 384                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
 385                             ARRAY_SIZE(node_cpuid));
 386                 return;
 387         }
 388         pxm = get_processor_proximity_domain(pa);
 389
 390         /* record this node in proximity bitmap */
 391         pxm_bit_set(pxm);
 392
 393         node_cpuid[srat_num_cpus].phys_id =
 394             (pa->apic_id << 8) | (pa->local_sapic_eid);
 395         /* nid should be overridden as logical node id later */
 396         node_cpuid[srat_num_cpus].nid = pxm;
 397         cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
 398         srat_num_cpus++;
 399 }
 400
 401 int __init
 402 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 403 {
 404         unsigned long paddr, size;
 405         int pxm;
 406         struct node_memblk_s *p, *q, *pend;
 407
 408         pxm = get_memory_proximity_domain(ma);
 409
 410         /* fill node memory chunk structure */
 411         paddr = ma->base_address;
 412         size = ma->length;
 413
 414         /* Ignore disabled entries */
 415         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 416                 return -1;
 417
 418         if (num_node_memblks >= NR_NODE_MEMBLKS) {
 419                 pr_err("NUMA: too many memblk ranges\n");
 420                 return -EINVAL;
 421         }
 422
 423         /* record this node in proximity bitmap */
 424         pxm_bit_set(pxm);
 425
 426         /* Insertion sort based on base address */
 427         pend = &node_memblk[num_node_memblks];
 428         for (p = &node_memblk[0]; p < pend; p++) {
 429                 if (paddr < p->start_paddr)
 430                         break;
 431         }
 432         if (p < pend) {
 433                 for (q = pend - 1; q >= p; q--)
 434                         *(q + 1) = *q;
 435         }
 436         p->start_paddr = paddr;
 437         p->size = size;
 438         p->nid = pxm;
 439         num_node_memblks++;
 440         return 0;
 441 }
 442
 443 void __init acpi_numa_fixup(void)
 444 {
 445         int i, j, node_from, node_to;
 446
 447         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 448         if (srat_num_cpus == 0) {
 449                 node_set_online(0);
 450                 node_cpuid[0].phys_id = hard_smp_processor_id();
 451                 slit_distance(0, 0) = LOCAL_DISTANCE;
 452                 goto out;
 453         }
 454
 455         /*
 456          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 457          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 458          */
 459         nodes_clear(node_online_map);
 460         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 461                 if (pxm_bit_test(i)) {
 462                         int nid = acpi_map_pxm_to_node(i);
 463                         node_set_online(nid);
 464                 }
 465         }
 466
 467         /* set logical node id in memory chunk structure */
 468         for (i = 0; i < num_node_memblks; i++)
 469                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 470
 471         /* assign memory bank numbers for each chunk on each node */
 472         for_each_online_node(i) {
 473                 int bank;
 474
 475                 bank = 0;
 476                 for (j = 0; j < num_node_memblks; j++)
 477                         if (node_memblk[j].nid == i)
 478                                 node_memblk[j].bank = bank++;
 479         }
 480
 481         /* set logical node id in cpu structure */
 482         for_each_possible_early_cpu(i)
 483                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 484
 485         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 486                num_online_nodes());
 487         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 488                num_node_memblks);
 489
 490         if (!slit_table) {
 491                 for (i = 0; i < MAX_NUMNODES; i++)
 492                         for (j = 0; j < MAX_NUMNODES; j++)
 493                                 slit_distance(i, j) = i == j ?
 494                                         LOCAL_DISTANCE : REMOTE_DISTANCE;
 495                 goto out;
 496         }
 497
 498         memset(numa_slit, -1, sizeof(numa_slit));
 499         for (i = 0; i < slit_table->locality_count; i++) {
 500                 if (!pxm_bit_test(i))
 501                         continue;
 502                 node_from = pxm_to_node(i);
 503                 for (j = 0; j < slit_table->locality_count; j++) {
 504                         if (!pxm_bit_test(j))
 505                                 continue;
 506                         node_to = pxm_to_node(j);
 507                         slit_distance(node_from, node_to) =
 508                             slit_table->entry[i * slit_table->locality_count + j];
 509                 }
 510         }
 511
 512 #ifdef SLIT_DEBUG
 513         printk("ACPI 2.0 SLIT locality table:\n");
 514         for_each_online_node(i) {
 515                 for_each_online_node(j)
 516                     printk("%03d ", node_distance(i, j));
 517                 printk("\n");
 518         }
 519 #endif
 520 out:
 521         node_possible_map = node_online_map;
 522 }
 523 #endif                          /* CONFIG_ACPI_NUMA */
 524
 525 /*
 526  * success: return IRQ number (>=0)
 527  * failure: return < 0
 528  */
 529 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
 530 {
 531         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 532                 return gsi;
 533
 534         if (has_8259 && gsi < 16)
 535                 return isa_irq_to_vector(gsi);
 536
 537         return iosapic_register_intr(gsi,
 538                                      (polarity ==
 539                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 540                                      IOSAPIC_POL_LOW,
 541                                      (triggering ==
 542                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 543                                      IOSAPIC_LEVEL);
 544 }
 545 EXPORT_SYMBOL_GPL(acpi_register_gsi);
 546
 547 void acpi_unregister_gsi(u32 gsi)
 548 {
 549         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 550                 return;
 551
 552         if (has_8259 && gsi < 16)
 553                 return;
 554
 555         iosapic_unregister_intr(gsi);
 556 }
 557 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
 558
 559 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 560 {
 561         struct acpi_table_header *fadt_header;
 562         struct acpi_table_fadt *fadt;
 563
 564         fadt_header = (struct acpi_table_header *)table;
 565         if (fadt_header->revision != 3)
 566                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 567
 568         fadt = (struct acpi_table_fadt *)fadt_header;
 569
 570         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
 571                                  ACPI_ACTIVE_LOW);
 572         return 0;
 573 }
 574
 575 int __init early_acpi_boot_init(void)
 576 {
 577         int ret;
 578
 579         /*
 580          * do a partial walk of MADT to determine how many CPUs
 581          * we have including offline CPUs
 582          */
 583         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 584                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 585                 return 0;
 586         }
 587
 588         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 589                 acpi_parse_lsapic, NR_CPUS);
 590         if (ret < 1)
 591                 printk(KERN_ERR PREFIX
 592                        "Error parsing MADT - no LAPIC entries\n");
 593         else
 594                 acpi_lapic = 1;
 595
 596 #ifdef CONFIG_SMP
 597         if (available_cpus == 0) {
 598                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 599                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 600                 smp_boot_data.cpu_phys_id[available_cpus] =
 601                     hard_smp_processor_id();
 602                 available_cpus = 1;     /* We've got at least one of these, no? */
 603         }
 604         smp_boot_data.cpu_count = available_cpus;
 605 #endif
 606         /* Make boot-up look pretty */
 607         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 608                total_cpus);
 609
 610         return 0;
 611 }
 612
 613 int __init acpi_boot_init(void)
 614 {
 615
 616         /*
 617          * MADT
 618          * ----
 619          * Parse the Multiple APIC Description Table (MADT), if exists.
 620          * Note that this table provides platform SMP configuration
 621          * information -- the successor to MPS tables.
 622          */
 623
 624         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 625                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 626                 goto skip_madt;
 627         }
 628
 629         /* Local APIC */
 630
 631         if (acpi_table_parse_madt
 632             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 633                 printk(KERN_ERR PREFIX
 634                        "Error parsing LAPIC address override entry\n");
 635
 636         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 637             < 0)
 638                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 639
 640         /* I/O APIC */
 641
 642         if (acpi_table_parse_madt
 643             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 644                 printk(KERN_ERR PREFIX
 645                        "Error parsing MADT - no IOSAPIC entries\n");
 646         }
 647
 648         /* System-Level Interrupt Routing */
 649
 650         if (acpi_table_parse_madt
 651             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 652              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 653                 printk(KERN_ERR PREFIX
 654                        "Error parsing platform interrupt source entry\n");
 655
 656         if (acpi_table_parse_madt
 657             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 658                 printk(KERN_ERR PREFIX
 659                        "Error parsing interrupt source overrides entry\n");
 660
 661         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 662                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 663       skip_madt:
 664
 665         /*
 666          * FADT says whether a legacy keyboard controller is present.
 667          * The FADT also contains an SCI_INT line, by which the system
 668          * gets interrupts such as power and sleep buttons.  If it's not
 669          * on a Legacy interrupt, it needs to be setup.
 670          */
 671         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 672                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 673
 674 #ifdef CONFIG_ACPI_NUMA
 675 #ifdef CONFIG_SMP
 676         if (srat_num_cpus == 0) {
 677                 int cpu, i = 1;
 678                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 679                         if (smp_boot_data.cpu_phys_id[cpu] !=
 680                             hard_smp_processor_id())
 681                                 node_cpuid[i++].phys_id =
 682                                     smp_boot_data.cpu_phys_id[cpu];
 683         }
 684 #endif
 685         build_cpu_to_node_map();
 686 #endif
 687         return 0;
 688 }
 689
 690 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 691 {
 692         int tmp;
 693
 694         if (has_8259 && gsi < 16)
 695                 *irq = isa_irq_to_vector(gsi);
 696         else {
 697                 tmp = gsi_to_irq(gsi);
 698                 if (tmp == -1)
 699                         return -1;
 700                 *irq = tmp;
 701         }
 702         return 0;
 703 }
 704
 705 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
 706 {
 707         if (isa_irq >= 16)
 708                 return -1;
 709         *gsi = isa_irq;
 710         return 0;
 711 }
 712
 713 /*
 714  *  ACPI based hotplug CPU support
 715  */
 716 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 717 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 718 {
 719 #ifdef CONFIG_ACPI_NUMA
 720         /*
 721          * We don't have cpu-only-node hotadd. But if the system equips
 722          * SRAT table, pxm is already found and node is ready.
 723          * So, just pxm_to_nid(pxm) is OK.
 724          * This code here is for the system which doesn't have full SRAT
 725          * table for possible cpus.
 726          */
 727         node_cpuid[cpu].phys_id = physid;
 728         node_cpuid[cpu].nid = acpi_get_node(handle);
 729 #endif
 730         return 0;
 731 }
 732
 733 int additional_cpus __initdata = -1;
 734
 735 static __init int setup_additional_cpus(char *s)
 736 {
 737         if (s)
 738                 additional_cpus = simple_strtol(s, NULL, 0);
 739
 740         return 0;
 741 }
 742
 743 early_param("additional_cpus", setup_additional_cpus);
 744
 745 /*
 746  * cpu_possible_mask should be static, it cannot change as CPUs
 747  * are onlined, or offlined. The reason is per-cpu data-structures
 748  * are allocated by some modules at init time, and dont expect to
 749  * do this dynamically on cpu arrival/departure.
 750  * cpu_present_mask on the other hand can change dynamically.
 751  * In case when cpu_hotplug is not compiled, then we resort to current
 752  * behaviour, which is cpu_possible == cpu_present.
 753  * - Ashok Raj
 754  *
 755  * Three ways to find out the number of additional hotplug CPUs:
 756  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 757  * - The user can overwrite it with additional_cpus=NUM
 758  * - Otherwise don't reserve additional CPUs.
 759  */
 760 __init void prefill_possible_map(void)
 761 {
 762         int i;
 763         int possible, disabled_cpus;
 764
 765         disabled_cpus = total_cpus - available_cpus;
 766
 767         if (additional_cpus == -1) {
 768                 if (disabled_cpus > 0)
 769                         additional_cpus = disabled_cpus;
 770                 else
 771                         additional_cpus = 0;
 772         }
 773
 774         possible = available_cpus + additional_cpus;
 775
 776         if (possible > nr_cpu_ids)
 777                 possible = nr_cpu_ids;
 778
 779         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 780                 possible, max((possible - available_cpus), 0));
 781
 782         for (i = 0; i < possible; i++)
 783                 set_cpu_possible(i, true);
 784 }
 785
 786 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
 787 {
 788         cpumask_t tmp_map;
 789         int cpu;
 790
 791         cpumask_complement(&tmp_map, cpu_present_mask);
 792         cpu = cpumask_first(&tmp_map);
 793         if (cpu >= nr_cpu_ids)
 794                 return -EINVAL;
 795
 796         acpi_map_cpu2node(handle, cpu, physid);
 797
 798         set_cpu_present(cpu, true);
 799         ia64_cpu_to_sapicid[cpu] = physid;
 800
 801         acpi_processor_set_pdc(handle);
 802
 803         *pcpu = cpu;
 804         return (0);
 805 }
 806
 807 /* wrapper to silence section mismatch warning */
 808 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
 809                        int *pcpu)
 810 {
 811         return _acpi_map_lsapic(handle, physid, pcpu);
 812 }
 813 EXPORT_SYMBOL(acpi_map_cpu);
 814
 815 int acpi_unmap_cpu(int cpu)
 816 {
 817         ia64_cpu_to_sapicid[cpu] = -1;
 818         set_cpu_present(cpu, false);
 819
 820 #ifdef CONFIG_ACPI_NUMA
 821         /* NUMA specific cleanup's */
 822 #endif
 823
 824         return (0);
 825 }
 826 EXPORT_SYMBOL(acpi_unmap_cpu);
 827 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 828
 829 #ifdef CONFIG_ACPI_NUMA
 830 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
 831                                     void *context, void **ret)
 832 {
 833         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 834         union acpi_object *obj;
 835         struct acpi_madt_io_sapic *iosapic;
 836         unsigned int gsi_base;
 837         int node;
 838
 839         /* Only care about objects w/ a method that returns the MADT */
 840         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 841                 return AE_OK;
 842
 843         if (!buffer.length || !buffer.pointer)
 844                 return AE_OK;
 845
 846         obj = buffer.pointer;
 847         if (obj->type != ACPI_TYPE_BUFFER ||
 848             obj->buffer.length < sizeof(*iosapic)) {
 849                 kfree(buffer.pointer);
 850                 return AE_OK;
 851         }
 852
 853         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 854
 855         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 856                 kfree(buffer.pointer);
 857                 return AE_OK;
 858         }
 859
 860         gsi_base = iosapic->global_irq_base;
 861
 862         kfree(buffer.pointer);
 863
 864         /* OK, it's an IOSAPIC MADT entry; associate it with a node */
 865         node = acpi_get_node(handle);
 866         if (node == NUMA_NO_NODE || !node_online(node) ||
 867             cpumask_empty(cpumask_of_node(node)))
 868                 return AE_OK;
 869
 870         /* We know a gsi to node mapping! */
 871         map_iosapic_to_node(gsi_base, node);
 872         return AE_OK;
 873 }
 874
 875 static int __init
 876 acpi_map_iosapics (void)
 877 {
 878         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 879         return 0;
 880 }
 881
 882 fs_initcall(acpi_map_iosapics);
 883 #endif                          /* CONFIG_ACPI_NUMA */
 884
 885 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 886 {
 887         int err;
 888
 889         if ((err = iosapic_init(phys_addr, gsi_base)))
 890                 return err;
 891
 892 #ifdef CONFIG_ACPI_NUMA
 893         acpi_map_iosapic(handle, 0, NULL, NULL);
 894 #endif                          /* CONFIG_ACPI_NUMA */
 895
 896         return 0;
 897 }
 898
 899 EXPORT_SYMBOL(acpi_register_ioapic);
 900
 901 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 902 {
 903         return iosapic_remove(gsi_base);
 904 }
 905
 906 EXPORT_SYMBOL(acpi_unregister_ioapic);
 907
 908 /*
 909  * acpi_suspend_lowlevel() - save kernel state and suspend.
 910  *
 911  * TBD when when IA64 starts to support suspend...
 912  */
 913 int acpi_suspend_lowlevel(void) { return 0; }