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/machvec.h>
  35 #include <asm/page.h>
  36 #include <asm/numa.h>
  37 #include <asm/sal.h>
  38 #include <asm/cyclone.h>
  39
  40 #define PREFIX                  "ACPI: "
  41
  42 int acpi_lapic;
  43 unsigned int acpi_cpei_override;
  44 unsigned int acpi_cpei_phys_cpuid;
  45
  46 unsigned long acpi_wakeup_address = 0;
  47
  48 #ifdef CONFIG_IA64_GENERIC
  49 static unsigned long __init acpi_find_rsdp(void)
  50 {
  51         unsigned long rsdp_phys = 0;
  52
  53         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  54                 rsdp_phys = efi.acpi20;
  55         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  56                 printk(KERN_WARNING PREFIX
  57                        "v1.0/r0.71 tables no longer supported\n");
  58         return rsdp_phys;
  59 }
  60
  61 const char __init *
  62 acpi_get_sysname(void)
  63 {
  64         unsigned long rsdp_phys;
  65         struct acpi_table_rsdp *rsdp;
  66         struct acpi_table_xsdt *xsdt;
  67         struct acpi_table_header *hdr;
  68 #ifdef CONFIG_INTEL_IOMMU
  69         u64 i, nentries;
  70 #endif
  71
  72         rsdp_phys = acpi_find_rsdp();
  73         if (!rsdp_phys) {
  74                 printk(KERN_ERR
  75                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  76                 return "dig";
  77         }
  78
  79         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
  80         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
  81                 printk(KERN_ERR
  82                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
  83                 return "dig";
  84         }
  85
  86         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
  87         hdr = &xsdt->header;
  88         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
  89                 printk(KERN_ERR
  90                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
  91                 return "dig";
  92         }
  93
  94         if (!strcmp(hdr->oem_id, "HP")) {
  95                 return "hpzx1";
  96         } else if (!strcmp(hdr->oem_id, "SGI")) {
  97                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
  98                         return "uv";
  99                 else
 100                         return "sn2";
 101         }
 102
 103 #ifdef CONFIG_INTEL_IOMMU
 104         /* Look for Intel IOMMU */
 105         nentries = (hdr->length - sizeof(*hdr)) /
 106                          sizeof(xsdt->table_offset_entry[0]);
 107         for (i = 0; i < nentries; i++) {
 108                 hdr = __va(xsdt->table_offset_entry[i]);
 109                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
 110                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
 111                         return "dig_vtd";
 112         }
 113 #endif
 114
 115         return "dig";
 116 }
 117 #endif /* CONFIG_IA64_GENERIC */
 118
 119 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 120
 121 /* Array to record platform interrupt vectors for generic interrupt routing. */
 122 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 123         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 124 };
 125
 126 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 127
 128 /*
 129  * Interrupt routing API for device drivers.  Provides interrupt vector for
 130  * a generic platform event.  Currently only CPEI is implemented.
 131  */
 132 int acpi_request_vector(u32 int_type)
 133 {
 134         int vector = -1;
 135
 136         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 137                 /* corrected platform error interrupt */
 138                 vector = platform_intr_list[int_type];
 139         } else
 140                 printk(KERN_ERR
 141                        "acpi_request_vector(): invalid interrupt type\n");
 142         return vector;
 143 }
 144
 145 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
 146 {
 147         return __va(phys);
 148 }
 149
 150 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
 151 {
 152 }
 153
 154 /* --------------------------------------------------------------------------
 155                             Boot-time Table Parsing
 156    -------------------------------------------------------------------------- */
 157
 158 static int available_cpus __initdata;
 159 struct acpi_table_madt *acpi_madt __initdata;
 160 static u8 has_8259;
 161
 162 static int __init
 163 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
 164                           const unsigned long end)
 165 {
 166         struct acpi_madt_local_apic_override *lapic;
 167
 168         lapic = (struct acpi_madt_local_apic_override *)header;
 169
 170         if (BAD_MADT_ENTRY(lapic, end))
 171                 return -EINVAL;
 172
 173         if (lapic->address) {
 174                 iounmap(ipi_base_addr);
 175                 ipi_base_addr = ioremap(lapic->address, 0);
 176         }
 177         return 0;
 178 }
 179
 180 static int __init
 181 acpi_parse_lsapic(union acpi_subtable_headers *header, const unsigned long end)
 182 {
 183         struct acpi_madt_local_sapic *lsapic;
 184
 185         lsapic = (struct acpi_madt_local_sapic *)header;
 186
 187         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 188
 189         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 190 #ifdef CONFIG_SMP
 191                 smp_boot_data.cpu_phys_id[available_cpus] =
 192                     (lsapic->id << 8) | lsapic->eid;
 193 #endif
 194                 ++available_cpus;
 195         }
 196
 197         total_cpus++;
 198         return 0;
 199 }
 200
 201 static int __init
 202 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
 203 {
 204         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 205
 206         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 207
 208         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 209                 return -EINVAL;
 210
 211         /* TBD: Support lapic_nmi entries */
 212         return 0;
 213 }
 214
 215 static int __init
 216 acpi_parse_iosapic(union acpi_subtable_headers * header, const unsigned long end)
 217 {
 218         struct acpi_madt_io_sapic *iosapic;
 219
 220         iosapic = (struct acpi_madt_io_sapic *)header;
 221
 222         if (BAD_MADT_ENTRY(iosapic, end))
 223                 return -EINVAL;
 224
 225         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 226 }
 227
 228 static unsigned int __initdata acpi_madt_rev;
 229
 230 static int __init
 231 acpi_parse_plat_int_src(union acpi_subtable_headers * header,
 232                         const unsigned long end)
 233 {
 234         struct acpi_madt_interrupt_source *plintsrc;
 235         int vector;
 236
 237         plintsrc = (struct acpi_madt_interrupt_source *)header;
 238
 239         if (BAD_MADT_ENTRY(plintsrc, end))
 240                 return -EINVAL;
 241
 242         /*
 243          * Get vector assignment for this interrupt, set attributes,
 244          * and program the IOSAPIC routing table.
 245          */
 246         vector = iosapic_register_platform_intr(plintsrc->type,
 247                                                 plintsrc->global_irq,
 248                                                 plintsrc->io_sapic_vector,
 249                                                 plintsrc->eid,
 250                                                 plintsrc->id,
 251                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 252                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 253                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 254                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 255                                                  ACPI_MADT_TRIGGER_EDGE) ?
 256                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 257
 258         platform_intr_list[plintsrc->type] = vector;
 259         if (acpi_madt_rev > 1) {
 260                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 261         }
 262
 263         /*
 264          * Save the physical id, so we can check when its being removed
 265          */
 266         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 267
 268         return 0;
 269 }
 270
 271 #ifdef CONFIG_HOTPLUG_CPU
 272 unsigned int can_cpei_retarget(void)
 273 {
 274         extern int cpe_vector;
 275         extern unsigned int force_cpei_retarget;
 276
 277         /*
 278          * Only if CPEI is supported and the override flag
 279          * is present, otherwise return that its re-targettable
 280          * if we are in polling mode.
 281          */
 282         if (cpe_vector > 0) {
 283                 if (acpi_cpei_override || force_cpei_retarget)
 284                         return 1;
 285                 else
 286                         return 0;
 287         }
 288         return 1;
 289 }
 290
 291 unsigned int is_cpu_cpei_target(unsigned int cpu)
 292 {
 293         unsigned int logical_id;
 294
 295         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 296
 297         if (logical_id == cpu)
 298                 return 1;
 299         else
 300                 return 0;
 301 }
 302
 303 void set_cpei_target_cpu(unsigned int cpu)
 304 {
 305         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 306 }
 307 #endif
 308
 309 unsigned int get_cpei_target_cpu(void)
 310 {
 311         return acpi_cpei_phys_cpuid;
 312 }
 313
 314 static int __init
 315 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
 316                        const unsigned long end)
 317 {
 318         struct acpi_madt_interrupt_override *p;
 319
 320         p = (struct acpi_madt_interrupt_override *)header;
 321
 322         if (BAD_MADT_ENTRY(p, end))
 323                 return -EINVAL;
 324
 325         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 326                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 327                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
 328                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
 329                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 330                                  ACPI_MADT_TRIGGER_LEVEL) ?
 331                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
 332         return 0;
 333 }
 334
 335 static int __init
 336 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
 337 {
 338         struct acpi_madt_nmi_source *nmi_src;
 339
 340         nmi_src = (struct acpi_madt_nmi_source *)header;
 341
 342         if (BAD_MADT_ENTRY(nmi_src, end))
 343                 return -EINVAL;
 344
 345         /* TBD: Support nimsrc entries */
 346         return 0;
 347 }
 348
 349 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 350 {
 351         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 352
 353                 /*
 354                  * Unfortunately ITC_DRIFT is not yet part of the
 355                  * official SAL spec, so the ITC_DRIFT bit is not
 356                  * set by the BIOS on this hardware.
 357                  */
 358                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 359
 360                 cyclone_setup();
 361         }
 362 }
 363
 364 static int __init acpi_parse_madt(struct acpi_table_header *table)
 365 {
 366         acpi_madt = (struct acpi_table_madt *)table;
 367
 368         acpi_madt_rev = acpi_madt->header.revision;
 369
 370         /* remember the value for reference after free_initmem() */
 371 #ifdef CONFIG_ITANIUM
 372         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 373 #else
 374         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 375 #endif
 376         iosapic_system_init(has_8259);
 377
 378         /* Get base address of IPI Message Block */
 379
 380         if (acpi_madt->address)
 381                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 382
 383         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 384
 385         acpi_madt_oem_check(acpi_madt->header.oem_id,
 386                             acpi_madt->header.oem_table_id);
 387
 388         return 0;
 389 }
 390
 391 #ifdef CONFIG_ACPI_NUMA
 392
 393 #undef SLIT_DEBUG
 394
 395 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 396
 397 static int __initdata srat_num_cpus;    /* number of cpus */
 398 static u32 pxm_flag[PXM_FLAG_LEN];
 399 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 400 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 401 static struct acpi_table_slit __initdata *slit_table;
 402 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 403
 404 static int __init
 405 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 406 {
 407         int pxm;
 408
 409         pxm = pa->proximity_domain_lo;
 410         if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
 411                 pxm += pa->proximity_domain_hi[0] << 8;
 412         return pxm;
 413 }
 414
 415 static int __init
 416 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 417 {
 418         int pxm;
 419
 420         pxm = ma->proximity_domain;
 421         if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
 422                 pxm &= 0xff;
 423
 424         return pxm;
 425 }
 426
 427 /*
 428  * ACPI 2.0 SLIT (System Locality Information Table)
 429  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 430  */
 431 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 432 {
 433         u32 len;
 434
 435         len = sizeof(struct acpi_table_header) + 8
 436             + slit->locality_count * slit->locality_count;
 437         if (slit->header.length != len) {
 438                 printk(KERN_ERR
 439                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 440                        len, slit->header.length);
 441                 return;
 442         }
 443         slit_table = slit;
 444 }
 445
 446 void __init
 447 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 448 {
 449         int pxm;
 450
 451         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 452                 return;
 453
 454         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
 455                 printk_once(KERN_WARNING
 456                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
 457                             ARRAY_SIZE(node_cpuid));
 458                 return;
 459         }
 460         pxm = get_processor_proximity_domain(pa);
 461
 462         /* record this node in proximity bitmap */
 463         pxm_bit_set(pxm);
 464
 465         node_cpuid[srat_num_cpus].phys_id =
 466             (pa->apic_id << 8) | (pa->local_sapic_eid);
 467         /* nid should be overridden as logical node id later */
 468         node_cpuid[srat_num_cpus].nid = pxm;
 469         cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
 470         srat_num_cpus++;
 471 }
 472
 473 int __init
 474 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 475 {
 476         unsigned long paddr, size;
 477         int pxm;
 478         struct node_memblk_s *p, *q, *pend;
 479
 480         pxm = get_memory_proximity_domain(ma);
 481
 482         /* fill node memory chunk structure */
 483         paddr = ma->base_address;
 484         size = ma->length;
 485
 486         /* Ignore disabled entries */
 487         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 488                 return -1;
 489
 490         if (num_node_memblks >= NR_NODE_MEMBLKS) {
 491                 pr_err("NUMA: too many memblk ranges\n");
 492                 return -EINVAL;
 493         }
 494
 495         /* record this node in proximity bitmap */
 496         pxm_bit_set(pxm);
 497
 498         /* Insertion sort based on base address */
 499         pend = &node_memblk[num_node_memblks];
 500         for (p = &node_memblk[0]; p < pend; p++) {
 501                 if (paddr < p->start_paddr)
 502                         break;
 503         }
 504         if (p < pend) {
 505                 for (q = pend - 1; q >= p; q--)
 506                         *(q + 1) = *q;
 507         }
 508         p->start_paddr = paddr;
 509         p->size = size;
 510         p->nid = pxm;
 511         num_node_memblks++;
 512         return 0;
 513 }
 514
 515 void __init acpi_numa_fixup(void)
 516 {
 517         int i, j, node_from, node_to;
 518
 519         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 520         if (srat_num_cpus == 0) {
 521                 node_set_online(0);
 522                 node_cpuid[0].phys_id = hard_smp_processor_id();
 523                 return;
 524         }
 525
 526         /*
 527          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 528          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 529          */
 530         nodes_clear(node_online_map);
 531         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 532                 if (pxm_bit_test(i)) {
 533                         int nid = acpi_map_pxm_to_node(i);
 534                         node_set_online(nid);
 535                 }
 536         }
 537
 538         /* set logical node id in memory chunk structure */
 539         for (i = 0; i < num_node_memblks; i++)
 540                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 541
 542         /* assign memory bank numbers for each chunk on each node */
 543         for_each_online_node(i) {
 544                 int bank;
 545
 546                 bank = 0;
 547                 for (j = 0; j < num_node_memblks; j++)
 548                         if (node_memblk[j].nid == i)
 549                                 node_memblk[j].bank = bank++;
 550         }
 551
 552         /* set logical node id in cpu structure */
 553         for_each_possible_early_cpu(i)
 554                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 555
 556         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 557                num_online_nodes());
 558         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 559                num_node_memblks);
 560
 561         if (!slit_table) {
 562                 for (i = 0; i < MAX_NUMNODES; i++)
 563                         for (j = 0; j < MAX_NUMNODES; j++)
 564                                 slit_distance(i, j) = i == j ?
 565                                         LOCAL_DISTANCE : REMOTE_DISTANCE;
 566                 return;
 567         }
 568
 569         memset(numa_slit, -1, sizeof(numa_slit));
 570         for (i = 0; i < slit_table->locality_count; i++) {
 571                 if (!pxm_bit_test(i))
 572                         continue;
 573                 node_from = pxm_to_node(i);
 574                 for (j = 0; j < slit_table->locality_count; j++) {
 575                         if (!pxm_bit_test(j))
 576                                 continue;
 577                         node_to = pxm_to_node(j);
 578                         slit_distance(node_from, node_to) =
 579                             slit_table->entry[i * slit_table->locality_count + j];
 580                 }
 581         }
 582
 583 #ifdef SLIT_DEBUG
 584         printk("ACPI 2.0 SLIT locality table:\n");
 585         for_each_online_node(i) {
 586                 for_each_online_node(j)
 587                     printk("%03d ", node_distance(i, j));
 588                 printk("\n");
 589         }
 590 #endif
 591 }
 592 #endif                          /* CONFIG_ACPI_NUMA */
 593
 594 /*
 595  * success: return IRQ number (>=0)
 596  * failure: return < 0
 597  */
 598 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
 599 {
 600         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 601                 return gsi;
 602
 603         if (has_8259 && gsi < 16)
 604                 return isa_irq_to_vector(gsi);
 605
 606         return iosapic_register_intr(gsi,
 607                                      (polarity ==
 608                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 609                                      IOSAPIC_POL_LOW,
 610                                      (triggering ==
 611                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 612                                      IOSAPIC_LEVEL);
 613 }
 614 EXPORT_SYMBOL_GPL(acpi_register_gsi);
 615
 616 void acpi_unregister_gsi(u32 gsi)
 617 {
 618         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 619                 return;
 620
 621         if (has_8259 && gsi < 16)
 622                 return;
 623
 624         iosapic_unregister_intr(gsi);
 625 }
 626 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
 627
 628 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 629 {
 630         struct acpi_table_header *fadt_header;
 631         struct acpi_table_fadt *fadt;
 632
 633         fadt_header = (struct acpi_table_header *)table;
 634         if (fadt_header->revision != 3)
 635                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 636
 637         fadt = (struct acpi_table_fadt *)fadt_header;
 638
 639         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
 640                                  ACPI_ACTIVE_LOW);
 641         return 0;
 642 }
 643
 644 int __init early_acpi_boot_init(void)
 645 {
 646         int ret;
 647
 648         /*
 649          * do a partial walk of MADT to determine how many CPUs
 650          * we have including offline CPUs
 651          */
 652         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 653                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 654                 return 0;
 655         }
 656
 657         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 658                 acpi_parse_lsapic, NR_CPUS);
 659         if (ret < 1)
 660                 printk(KERN_ERR PREFIX
 661                        "Error parsing MADT - no LAPIC entries\n");
 662         else
 663                 acpi_lapic = 1;
 664
 665 #ifdef CONFIG_SMP
 666         if (available_cpus == 0) {
 667                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 668                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 669                 smp_boot_data.cpu_phys_id[available_cpus] =
 670                     hard_smp_processor_id();
 671                 available_cpus = 1;     /* We've got at least one of these, no? */
 672         }
 673         smp_boot_data.cpu_count = available_cpus;
 674 #endif
 675         /* Make boot-up look pretty */
 676         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 677                total_cpus);
 678
 679         return 0;
 680 }
 681
 682 int __init acpi_boot_init(void)
 683 {
 684
 685         /*
 686          * MADT
 687          * ----
 688          * Parse the Multiple APIC Description Table (MADT), if exists.
 689          * Note that this table provides platform SMP configuration
 690          * information -- the successor to MPS tables.
 691          */
 692
 693         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 694                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 695                 goto skip_madt;
 696         }
 697
 698         /* Local APIC */
 699
 700         if (acpi_table_parse_madt
 701             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 702                 printk(KERN_ERR PREFIX
 703                        "Error parsing LAPIC address override entry\n");
 704
 705         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 706             < 0)
 707                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 708
 709         /* I/O APIC */
 710
 711         if (acpi_table_parse_madt
 712             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 713                 if (!ia64_platform_is("sn2"))
 714                         printk(KERN_ERR PREFIX
 715                                "Error parsing MADT - no IOSAPIC entries\n");
 716         }
 717
 718         /* System-Level Interrupt Routing */
 719
 720         if (acpi_table_parse_madt
 721             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 722              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 723                 printk(KERN_ERR PREFIX
 724                        "Error parsing platform interrupt source entry\n");
 725
 726         if (acpi_table_parse_madt
 727             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 728                 printk(KERN_ERR PREFIX
 729                        "Error parsing interrupt source overrides entry\n");
 730
 731         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 732                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 733       skip_madt:
 734
 735         /*
 736          * FADT says whether a legacy keyboard controller is present.
 737          * The FADT also contains an SCI_INT line, by which the system
 738          * gets interrupts such as power and sleep buttons.  If it's not
 739          * on a Legacy interrupt, it needs to be setup.
 740          */
 741         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 742                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 743
 744 #ifdef CONFIG_ACPI_NUMA
 745 #ifdef CONFIG_SMP
 746         if (srat_num_cpus == 0) {
 747                 int cpu, i = 1;
 748                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 749                         if (smp_boot_data.cpu_phys_id[cpu] !=
 750                             hard_smp_processor_id())
 751                                 node_cpuid[i++].phys_id =
 752                                     smp_boot_data.cpu_phys_id[cpu];
 753         }
 754 #endif
 755         build_cpu_to_node_map();
 756 #endif
 757         return 0;
 758 }
 759
 760 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 761 {
 762         int tmp;
 763
 764         if (has_8259 && gsi < 16)
 765                 *irq = isa_irq_to_vector(gsi);
 766         else {
 767                 tmp = gsi_to_irq(gsi);
 768                 if (tmp == -1)
 769                         return -1;
 770                 *irq = tmp;
 771         }
 772         return 0;
 773 }
 774
 775 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
 776 {
 777         if (isa_irq >= 16)
 778                 return -1;
 779         *gsi = isa_irq;
 780         return 0;
 781 }
 782
 783 /*
 784  *  ACPI based hotplug CPU support
 785  */
 786 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 787 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 788 {
 789 #ifdef CONFIG_ACPI_NUMA
 790         /*
 791          * We don't have cpu-only-node hotadd. But if the system equips
 792          * SRAT table, pxm is already found and node is ready.
 793          * So, just pxm_to_nid(pxm) is OK.
 794          * This code here is for the system which doesn't have full SRAT
 795          * table for possible cpus.
 796          */
 797         node_cpuid[cpu].phys_id = physid;
 798         node_cpuid[cpu].nid = acpi_get_node(handle);
 799 #endif
 800         return 0;
 801 }
 802
 803 int additional_cpus __initdata = -1;
 804
 805 static __init int setup_additional_cpus(char *s)
 806 {
 807         if (s)
 808                 additional_cpus = simple_strtol(s, NULL, 0);
 809
 810         return 0;
 811 }
 812
 813 early_param("additional_cpus", setup_additional_cpus);
 814
 815 /*
 816  * cpu_possible_mask should be static, it cannot change as CPUs
 817  * are onlined, or offlined. The reason is per-cpu data-structures
 818  * are allocated by some modules at init time, and dont expect to
 819  * do this dynamically on cpu arrival/departure.
 820  * cpu_present_mask on the other hand can change dynamically.
 821  * In case when cpu_hotplug is not compiled, then we resort to current
 822  * behaviour, which is cpu_possible == cpu_present.
 823  * - Ashok Raj
 824  *
 825  * Three ways to find out the number of additional hotplug CPUs:
 826  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 827  * - The user can overwrite it with additional_cpus=NUM
 828  * - Otherwise don't reserve additional CPUs.
 829  */
 830 __init void prefill_possible_map(void)
 831 {
 832         int i;
 833         int possible, disabled_cpus;
 834
 835         disabled_cpus = total_cpus - available_cpus;
 836
 837         if (additional_cpus == -1) {
 838                 if (disabled_cpus > 0)
 839                         additional_cpus = disabled_cpus;
 840                 else
 841                         additional_cpus = 0;
 842         }
 843
 844         possible = available_cpus + additional_cpus;
 845
 846         if (possible > nr_cpu_ids)
 847                 possible = nr_cpu_ids;
 848
 849         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 850                 possible, max((possible - available_cpus), 0));
 851
 852         for (i = 0; i < possible; i++)
 853                 set_cpu_possible(i, true);
 854 }
 855
 856 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
 857 {
 858         cpumask_t tmp_map;
 859         int cpu;
 860
 861         cpumask_complement(&tmp_map, cpu_present_mask);
 862         cpu = cpumask_first(&tmp_map);
 863         if (cpu >= nr_cpu_ids)
 864                 return -EINVAL;
 865
 866         acpi_map_cpu2node(handle, cpu, physid);
 867
 868         set_cpu_present(cpu, true);
 869         ia64_cpu_to_sapicid[cpu] = physid;
 870
 871         acpi_processor_set_pdc(handle);
 872
 873         *pcpu = cpu;
 874         return (0);
 875 }
 876
 877 /* wrapper to silence section mismatch warning */
 878 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
 879                        int *pcpu)
 880 {
 881         return _acpi_map_lsapic(handle, physid, pcpu);
 882 }
 883 EXPORT_SYMBOL(acpi_map_cpu);
 884
 885 int acpi_unmap_cpu(int cpu)
 886 {
 887         ia64_cpu_to_sapicid[cpu] = -1;
 888         set_cpu_present(cpu, false);
 889
 890 #ifdef CONFIG_ACPI_NUMA
 891         /* NUMA specific cleanup's */
 892 #endif
 893
 894         return (0);
 895 }
 896 EXPORT_SYMBOL(acpi_unmap_cpu);
 897 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 898
 899 #ifdef CONFIG_ACPI_NUMA
 900 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
 901                                     void *context, void **ret)
 902 {
 903         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 904         union acpi_object *obj;
 905         struct acpi_madt_io_sapic *iosapic;
 906         unsigned int gsi_base;
 907         int node;
 908
 909         /* Only care about objects w/ a method that returns the MADT */
 910         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 911                 return AE_OK;
 912
 913         if (!buffer.length || !buffer.pointer)
 914                 return AE_OK;
 915
 916         obj = buffer.pointer;
 917         if (obj->type != ACPI_TYPE_BUFFER ||
 918             obj->buffer.length < sizeof(*iosapic)) {
 919                 kfree(buffer.pointer);
 920                 return AE_OK;
 921         }
 922
 923         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 924
 925         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 926                 kfree(buffer.pointer);
 927                 return AE_OK;
 928         }
 929
 930         gsi_base = iosapic->global_irq_base;
 931
 932         kfree(buffer.pointer);
 933
 934         /* OK, it's an IOSAPIC MADT entry; associate it with a node */
 935         node = acpi_get_node(handle);
 936         if (node == NUMA_NO_NODE || !node_online(node) ||
 937             cpumask_empty(cpumask_of_node(node)))
 938                 return AE_OK;
 939
 940         /* We know a gsi to node mapping! */
 941         map_iosapic_to_node(gsi_base, node);
 942         return AE_OK;
 943 }
 944
 945 static int __init
 946 acpi_map_iosapics (void)
 947 {
 948         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 949         return 0;
 950 }
 951
 952 fs_initcall(acpi_map_iosapics);
 953 #endif                          /* CONFIG_ACPI_NUMA */
 954
 955 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 956 {
 957         int err;
 958
 959         if ((err = iosapic_init(phys_addr, gsi_base)))
 960                 return err;
 961
 962 #ifdef CONFIG_ACPI_NUMA
 963         acpi_map_iosapic(handle, 0, NULL, NULL);
 964 #endif                          /* CONFIG_ACPI_NUMA */
 965
 966         return 0;
 967 }
 968
 969 EXPORT_SYMBOL(acpi_register_ioapic);
 970
 971 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 972 {
 973         return iosapic_remove(gsi_base);
 974 }
 975
 976 EXPORT_SYMBOL(acpi_unregister_ioapic);
 977
 978 /*
 979  * acpi_suspend_lowlevel() - save kernel state and suspend.
 980  *
 981  * TBD when when IA64 starts to support suspend...
 982  */
 983 int acpi_suspend_lowlevel(void) { return 0; }