linux/arch/ia64/kernel/acpi.c
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   1/*
   2 *  acpi.c - Architecture-Specific Low-Level ACPI Support
   3 *
   4 *  Copyright (C) 1999 VA Linux Systems
   5 *  Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
   6 *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
   7 *      David Mosberger-Tang <davidm@hpl.hp.com>
   8 *  Copyright (C) 2000 Intel Corp.
   9 *  Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
  10 *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  11 *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
  12 *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
  13 *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
  14 *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
  15 *
  16 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  17 *
  18 *  This program is free software; you can redistribute it and/or modify
  19 *  it under the terms of the GNU General Public License as published by
  20 *  the Free Software Foundation; either version 2 of the License, or
  21 *  (at your option) any later version.
  22 *
  23 *  This program is distributed in the hope that it will be useful,
  24 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  25 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26 *  GNU General Public License for more details.
  27 *
  28 *  You should have received a copy of the GNU General Public License
  29 *  along with this program; if not, write to the Free Software
  30 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  31 *
  32 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  33 */
  34
  35#include <linux/module.h>
  36#include <linux/init.h>
  37#include <linux/kernel.h>
  38#include <linux/sched.h>
  39#include <linux/smp.h>
  40#include <linux/string.h>
  41#include <linux/types.h>
  42#include <linux/irq.h>
  43#include <linux/acpi.h>
  44#include <linux/efi.h>
  45#include <linux/mmzone.h>
  46#include <linux/nodemask.h>
  47#include <linux/slab.h>
  48#include <acpi/processor.h>
  49#include <asm/io.h>
  50#include <asm/iosapic.h>
  51#include <asm/machvec.h>
  52#include <asm/page.h>
  53#include <asm/numa.h>
  54#include <asm/sal.h>
  55#include <asm/cyclone.h>
  56
  57#define PREFIX                  "ACPI: "
  58
  59int acpi_lapic;
  60unsigned int acpi_cpei_override;
  61unsigned int acpi_cpei_phys_cpuid;
  62
  63unsigned long acpi_wakeup_address = 0;
  64
  65#ifdef CONFIG_IA64_GENERIC
  66static unsigned long __init acpi_find_rsdp(void)
  67{
  68        unsigned long rsdp_phys = 0;
  69
  70        if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  71                rsdp_phys = efi.acpi20;
  72        else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  73                printk(KERN_WARNING PREFIX
  74                       "v1.0/r0.71 tables no longer supported\n");
  75        return rsdp_phys;
  76}
  77
  78const char __init *
  79acpi_get_sysname(void)
  80{
  81        unsigned long rsdp_phys;
  82        struct acpi_table_rsdp *rsdp;
  83        struct acpi_table_xsdt *xsdt;
  84        struct acpi_table_header *hdr;
  85#ifdef CONFIG_INTEL_IOMMU
  86        u64 i, nentries;
  87#endif
  88
  89        rsdp_phys = acpi_find_rsdp();
  90        if (!rsdp_phys) {
  91                printk(KERN_ERR
  92                       "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  93                return "dig";
  94        }
  95
  96        rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
  97        if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
  98                printk(KERN_ERR
  99                       "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 100                return "dig";
 101        }
 102
 103        xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 104        hdr = &xsdt->header;
 105        if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 106                printk(KERN_ERR
 107                       "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 108                return "dig";
 109        }
 110
 111        if (!strcmp(hdr->oem_id, "HP")) {
 112                return "hpzx1";
 113        } else if (!strcmp(hdr->oem_id, "SGI")) {
 114                if (!strcmp(hdr->oem_table_id + 4, "UV"))
 115                        return "uv";
 116                else
 117                        return "sn2";
 118        }
 119
 120#ifdef CONFIG_INTEL_IOMMU
 121        /* Look for Intel IOMMU */
 122        nentries = (hdr->length - sizeof(*hdr)) /
 123                         sizeof(xsdt->table_offset_entry[0]);
 124        for (i = 0; i < nentries; i++) {
 125                hdr = __va(xsdt->table_offset_entry[i]);
 126                if (strncmp(hdr->signature, ACPI_SIG_DMAR,
 127                        sizeof(ACPI_SIG_DMAR) - 1) == 0)
 128                        return "dig_vtd";
 129        }
 130#endif
 131
 132        return "dig";
 133}
 134#endif /* CONFIG_IA64_GENERIC */
 135
 136#define ACPI_MAX_PLATFORM_INTERRUPTS    256
 137
 138/* Array to record platform interrupt vectors for generic interrupt routing. */
 139int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 140        [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 141};
 142
 143enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 144
 145/*
 146 * Interrupt routing API for device drivers.  Provides interrupt vector for
 147 * a generic platform event.  Currently only CPEI is implemented.
 148 */
 149int acpi_request_vector(u32 int_type)
 150{
 151        int vector = -1;
 152
 153        if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 154                /* corrected platform error interrupt */
 155                vector = platform_intr_list[int_type];
 156        } else
 157                printk(KERN_ERR
 158                       "acpi_request_vector(): invalid interrupt type\n");
 159        return vector;
 160}
 161
 162char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 163{
 164        return __va(phys_addr);
 165}
 166
 167void __init __acpi_unmap_table(char *map, unsigned long size)
 168{
 169}
 170
 171/* --------------------------------------------------------------------------
 172                            Boot-time Table Parsing
 173   -------------------------------------------------------------------------- */
 174
 175static int available_cpus __initdata;
 176struct acpi_table_madt *acpi_madt __initdata;
 177static u8 has_8259;
 178
 179static int __init
 180acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 181                          const unsigned long end)
 182{
 183        struct acpi_madt_local_apic_override *lapic;
 184
 185        lapic = (struct acpi_madt_local_apic_override *)header;
 186
 187        if (BAD_MADT_ENTRY(lapic, end))
 188                return -EINVAL;
 189
 190        if (lapic->address) {
 191                iounmap(ipi_base_addr);
 192                ipi_base_addr = ioremap(lapic->address, 0);
 193        }
 194        return 0;
 195}
 196
 197static int __init
 198acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 199{
 200        struct acpi_madt_local_sapic *lsapic;
 201
 202        lsapic = (struct acpi_madt_local_sapic *)header;
 203
 204        /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 205
 206        if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 207#ifdef CONFIG_SMP
 208                smp_boot_data.cpu_phys_id[available_cpus] =
 209                    (lsapic->id << 8) | lsapic->eid;
 210#endif
 211                ++available_cpus;
 212        }
 213
 214        total_cpus++;
 215        return 0;
 216}
 217
 218static int __init
 219acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 220{
 221        struct acpi_madt_local_apic_nmi *lacpi_nmi;
 222
 223        lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 224
 225        if (BAD_MADT_ENTRY(lacpi_nmi, end))
 226                return -EINVAL;
 227
 228        /* TBD: Support lapic_nmi entries */
 229        return 0;
 230}
 231
 232static int __init
 233acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 234{
 235        struct acpi_madt_io_sapic *iosapic;
 236
 237        iosapic = (struct acpi_madt_io_sapic *)header;
 238
 239        if (BAD_MADT_ENTRY(iosapic, end))
 240                return -EINVAL;
 241
 242        return iosapic_init(iosapic->address, iosapic->global_irq_base);
 243}
 244
 245static unsigned int __initdata acpi_madt_rev;
 246
 247static int __init
 248acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 249                        const unsigned long end)
 250{
 251        struct acpi_madt_interrupt_source *plintsrc;
 252        int vector;
 253
 254        plintsrc = (struct acpi_madt_interrupt_source *)header;
 255
 256        if (BAD_MADT_ENTRY(plintsrc, end))
 257                return -EINVAL;
 258
 259        /*
 260         * Get vector assignment for this interrupt, set attributes,
 261         * and program the IOSAPIC routing table.
 262         */
 263        vector = iosapic_register_platform_intr(plintsrc->type,
 264                                                plintsrc->global_irq,
 265                                                plintsrc->io_sapic_vector,
 266                                                plintsrc->eid,
 267                                                plintsrc->id,
 268                                                ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 269                                                 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 270                                                IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 271                                                ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 272                                                 ACPI_MADT_TRIGGER_EDGE) ?
 273                                                IOSAPIC_EDGE : IOSAPIC_LEVEL);
 274
 275        platform_intr_list[plintsrc->type] = vector;
 276        if (acpi_madt_rev > 1) {
 277                acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 278        }
 279
 280        /*
 281         * Save the physical id, so we can check when its being removed
 282         */
 283        acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 284
 285        return 0;
 286}
 287
 288#ifdef CONFIG_HOTPLUG_CPU
 289unsigned int can_cpei_retarget(void)
 290{
 291        extern int cpe_vector;
 292        extern unsigned int force_cpei_retarget;
 293
 294        /*
 295         * Only if CPEI is supported and the override flag
 296         * is present, otherwise return that its re-targettable
 297         * if we are in polling mode.
 298         */
 299        if (cpe_vector > 0) {
 300                if (acpi_cpei_override || force_cpei_retarget)
 301                        return 1;
 302                else
 303                        return 0;
 304        }
 305        return 1;
 306}
 307
 308unsigned int is_cpu_cpei_target(unsigned int cpu)
 309{
 310        unsigned int logical_id;
 311
 312        logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 313
 314        if (logical_id == cpu)
 315                return 1;
 316        else
 317                return 0;
 318}
 319
 320void set_cpei_target_cpu(unsigned int cpu)
 321{
 322        acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 323}
 324#endif
 325
 326unsigned int get_cpei_target_cpu(void)
 327{
 328        return acpi_cpei_phys_cpuid;
 329}
 330
 331static int __init
 332acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 333                       const unsigned long end)
 334{
 335        struct acpi_madt_interrupt_override *p;
 336
 337        p = (struct acpi_madt_interrupt_override *)header;
 338
 339        if (BAD_MADT_ENTRY(p, end))
 340                return -EINVAL;
 341
 342        iosapic_override_isa_irq(p->source_irq, p->global_irq,
 343                                 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 344                                  ACPI_MADT_POLARITY_ACTIVE_LOW) ?
 345                                 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
 346                                 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 347                                 ACPI_MADT_TRIGGER_LEVEL) ?
 348                                 IOSAPIC_LEVEL : IOSAPIC_EDGE);
 349        return 0;
 350}
 351
 352static int __init
 353acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 354{
 355        struct acpi_madt_nmi_source *nmi_src;
 356
 357        nmi_src = (struct acpi_madt_nmi_source *)header;
 358
 359        if (BAD_MADT_ENTRY(nmi_src, end))
 360                return -EINVAL;
 361
 362        /* TBD: Support nimsrc entries */
 363        return 0;
 364}
 365
 366static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 367{
 368        if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 369
 370                /*
 371                 * Unfortunately ITC_DRIFT is not yet part of the
 372                 * official SAL spec, so the ITC_DRIFT bit is not
 373                 * set by the BIOS on this hardware.
 374                 */
 375                sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 376
 377                cyclone_setup();
 378        }
 379}
 380
 381static int __init acpi_parse_madt(struct acpi_table_header *table)
 382{
 383        acpi_madt = (struct acpi_table_madt *)table;
 384
 385        acpi_madt_rev = acpi_madt->header.revision;
 386
 387        /* remember the value for reference after free_initmem() */
 388#ifdef CONFIG_ITANIUM
 389        has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 390#else
 391        has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 392#endif
 393        iosapic_system_init(has_8259);
 394
 395        /* Get base address of IPI Message Block */
 396
 397        if (acpi_madt->address)
 398                ipi_base_addr = ioremap(acpi_madt->address, 0);
 399
 400        printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 401
 402        acpi_madt_oem_check(acpi_madt->header.oem_id,
 403                            acpi_madt->header.oem_table_id);
 404
 405        return 0;
 406}
 407
 408#ifdef CONFIG_ACPI_NUMA
 409
 410#undef SLIT_DEBUG
 411
 412#define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 413
 414static int __initdata srat_num_cpus;    /* number of cpus */
 415static u32 pxm_flag[PXM_FLAG_LEN];
 416#define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 417#define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 418static struct acpi_table_slit __initdata *slit_table;
 419cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 420
 421static int __init
 422get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 423{
 424        int pxm;
 425
 426        pxm = pa->proximity_domain_lo;
 427        if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
 428                pxm += pa->proximity_domain_hi[0] << 8;
 429        return pxm;
 430}
 431
 432static int __init
 433get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 434{
 435        int pxm;
 436
 437        pxm = ma->proximity_domain;
 438        if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
 439                pxm &= 0xff;
 440
 441        return pxm;
 442}
 443
 444/*
 445 * ACPI 2.0 SLIT (System Locality Information Table)
 446 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 447 */
 448void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 449{
 450        u32 len;
 451
 452        len = sizeof(struct acpi_table_header) + 8
 453            + slit->locality_count * slit->locality_count;
 454        if (slit->header.length != len) {
 455                printk(KERN_ERR
 456                       "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 457                       len, slit->header.length);
 458                return;
 459        }
 460        slit_table = slit;
 461}
 462
 463void __init
 464acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 465{
 466        int pxm;
 467
 468        if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 469                return;
 470
 471        if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
 472                printk_once(KERN_WARNING
 473                            "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
 474                            ARRAY_SIZE(node_cpuid));
 475                return;
 476        }
 477        pxm = get_processor_proximity_domain(pa);
 478
 479        /* record this node in proximity bitmap */
 480        pxm_bit_set(pxm);
 481
 482        node_cpuid[srat_num_cpus].phys_id =
 483            (pa->apic_id << 8) | (pa->local_sapic_eid);
 484        /* nid should be overridden as logical node id later */
 485        node_cpuid[srat_num_cpus].nid = pxm;
 486        cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
 487        srat_num_cpus++;
 488}
 489
 490int __init
 491acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 492{
 493        unsigned long paddr, size;
 494        int pxm;
 495        struct node_memblk_s *p, *q, *pend;
 496
 497        pxm = get_memory_proximity_domain(ma);
 498
 499        /* fill node memory chunk structure */
 500        paddr = ma->base_address;
 501        size = ma->length;
 502
 503        /* Ignore disabled entries */
 504        if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 505                return -1;
 506
 507        /* record this node in proximity bitmap */
 508        pxm_bit_set(pxm);
 509
 510        /* Insertion sort based on base address */
 511        pend = &node_memblk[num_node_memblks];
 512        for (p = &node_memblk[0]; p < pend; p++) {
 513                if (paddr < p->start_paddr)
 514                        break;
 515        }
 516        if (p < pend) {
 517                for (q = pend - 1; q >= p; q--)
 518                        *(q + 1) = *q;
 519        }
 520        p->start_paddr = paddr;
 521        p->size = size;
 522        p->nid = pxm;
 523        num_node_memblks++;
 524        return 0;
 525}
 526
 527void __init acpi_numa_fixup(void)
 528{
 529        int i, j, node_from, node_to;
 530
 531        /* If there's no SRAT, fix the phys_id and mark node 0 online */
 532        if (srat_num_cpus == 0) {
 533                node_set_online(0);
 534                node_cpuid[0].phys_id = hard_smp_processor_id();
 535                return;
 536        }
 537
 538        /*
 539         * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 540         * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 541         */
 542        nodes_clear(node_online_map);
 543        for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 544                if (pxm_bit_test(i)) {
 545                        int nid = acpi_map_pxm_to_node(i);
 546                        node_set_online(nid);
 547                }
 548        }
 549
 550        /* set logical node id in memory chunk structure */
 551        for (i = 0; i < num_node_memblks; i++)
 552                node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 553
 554        /* assign memory bank numbers for each chunk on each node */
 555        for_each_online_node(i) {
 556                int bank;
 557
 558                bank = 0;
 559                for (j = 0; j < num_node_memblks; j++)
 560                        if (node_memblk[j].nid == i)
 561                                node_memblk[j].bank = bank++;
 562        }
 563
 564        /* set logical node id in cpu structure */
 565        for_each_possible_early_cpu(i)
 566                node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 567
 568        printk(KERN_INFO "Number of logical nodes in system = %d\n",
 569               num_online_nodes());
 570        printk(KERN_INFO "Number of memory chunks in system = %d\n",
 571               num_node_memblks);
 572
 573        if (!slit_table) {
 574                for (i = 0; i < MAX_NUMNODES; i++)
 575                        for (j = 0; j < MAX_NUMNODES; j++)
 576                                node_distance(i, j) = i == j ? LOCAL_DISTANCE :
 577                                                        REMOTE_DISTANCE;
 578                return;
 579        }
 580
 581        memset(numa_slit, -1, sizeof(numa_slit));
 582        for (i = 0; i < slit_table->locality_count; i++) {
 583                if (!pxm_bit_test(i))
 584                        continue;
 585                node_from = pxm_to_node(i);
 586                for (j = 0; j < slit_table->locality_count; j++) {
 587                        if (!pxm_bit_test(j))
 588                                continue;
 589                        node_to = pxm_to_node(j);
 590                        node_distance(node_from, node_to) =
 591                            slit_table->entry[i * slit_table->locality_count + j];
 592                }
 593        }
 594
 595#ifdef SLIT_DEBUG
 596        printk("ACPI 2.0 SLIT locality table:\n");
 597        for_each_online_node(i) {
 598                for_each_online_node(j)
 599                    printk("%03d ", node_distance(i, j));
 600                printk("\n");
 601        }
 602#endif
 603}
 604#endif                          /* CONFIG_ACPI_NUMA */
 605
 606/*
 607 * success: return IRQ number (>=0)
 608 * failure: return < 0
 609 */
 610int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
 611{
 612        if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 613                return gsi;
 614
 615        if (has_8259 && gsi < 16)
 616                return isa_irq_to_vector(gsi);
 617
 618        return iosapic_register_intr(gsi,
 619                                     (polarity ==
 620                                      ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 621                                     IOSAPIC_POL_LOW,
 622                                     (triggering ==
 623                                      ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 624                                     IOSAPIC_LEVEL);
 625}
 626EXPORT_SYMBOL_GPL(acpi_register_gsi);
 627
 628void acpi_unregister_gsi(u32 gsi)
 629{
 630        if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 631                return;
 632
 633        if (has_8259 && gsi < 16)
 634                return;
 635
 636        iosapic_unregister_intr(gsi);
 637}
 638EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
 639
 640static int __init acpi_parse_fadt(struct acpi_table_header *table)
 641{
 642        struct acpi_table_header *fadt_header;
 643        struct acpi_table_fadt *fadt;
 644
 645        fadt_header = (struct acpi_table_header *)table;
 646        if (fadt_header->revision != 3)
 647                return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 648
 649        fadt = (struct acpi_table_fadt *)fadt_header;
 650
 651        acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
 652                                 ACPI_ACTIVE_LOW);
 653        return 0;
 654}
 655
 656int __init early_acpi_boot_init(void)
 657{
 658        int ret;
 659
 660        /*
 661         * do a partial walk of MADT to determine how many CPUs
 662         * we have including offline CPUs
 663         */
 664        if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 665                printk(KERN_ERR PREFIX "Can't find MADT\n");
 666                return 0;
 667        }
 668
 669        ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 670                acpi_parse_lsapic, NR_CPUS);
 671        if (ret < 1)
 672                printk(KERN_ERR PREFIX
 673                       "Error parsing MADT - no LAPIC entries\n");
 674        else
 675                acpi_lapic = 1;
 676
 677#ifdef CONFIG_SMP
 678        if (available_cpus == 0) {
 679                printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 680                printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 681                smp_boot_data.cpu_phys_id[available_cpus] =
 682                    hard_smp_processor_id();
 683                available_cpus = 1;     /* We've got at least one of these, no? */
 684        }
 685        smp_boot_data.cpu_count = available_cpus;
 686#endif
 687        /* Make boot-up look pretty */
 688        printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 689               total_cpus);
 690
 691        return 0;
 692}
 693
 694int __init acpi_boot_init(void)
 695{
 696
 697        /*
 698         * MADT
 699         * ----
 700         * Parse the Multiple APIC Description Table (MADT), if exists.
 701         * Note that this table provides platform SMP configuration
 702         * information -- the successor to MPS tables.
 703         */
 704
 705        if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 706                printk(KERN_ERR PREFIX "Can't find MADT\n");
 707                goto skip_madt;
 708        }
 709
 710        /* Local APIC */
 711
 712        if (acpi_table_parse_madt
 713            (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 714                printk(KERN_ERR PREFIX
 715                       "Error parsing LAPIC address override entry\n");
 716
 717        if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 718            < 0)
 719                printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 720
 721        /* I/O APIC */
 722
 723        if (acpi_table_parse_madt
 724            (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 725                if (!ia64_platform_is("sn2"))
 726                        printk(KERN_ERR PREFIX
 727                               "Error parsing MADT - no IOSAPIC entries\n");
 728        }
 729
 730        /* System-Level Interrupt Routing */
 731
 732        if (acpi_table_parse_madt
 733            (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 734             ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 735                printk(KERN_ERR PREFIX
 736                       "Error parsing platform interrupt source entry\n");
 737
 738        if (acpi_table_parse_madt
 739            (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 740                printk(KERN_ERR PREFIX
 741                       "Error parsing interrupt source overrides entry\n");
 742
 743        if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 744                printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 745      skip_madt:
 746
 747        /*
 748         * FADT says whether a legacy keyboard controller is present.
 749         * The FADT also contains an SCI_INT line, by which the system
 750         * gets interrupts such as power and sleep buttons.  If it's not
 751         * on a Legacy interrupt, it needs to be setup.
 752         */
 753        if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 754                printk(KERN_ERR PREFIX "Can't find FADT\n");
 755
 756#ifdef CONFIG_ACPI_NUMA
 757#ifdef CONFIG_SMP
 758        if (srat_num_cpus == 0) {
 759                int cpu, i = 1;
 760                for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 761                        if (smp_boot_data.cpu_phys_id[cpu] !=
 762                            hard_smp_processor_id())
 763                                node_cpuid[i++].phys_id =
 764                                    smp_boot_data.cpu_phys_id[cpu];
 765        }
 766#endif
 767        build_cpu_to_node_map();
 768#endif
 769        return 0;
 770}
 771
 772int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 773{
 774        int tmp;
 775
 776        if (has_8259 && gsi < 16)
 777                *irq = isa_irq_to_vector(gsi);
 778        else {
 779                tmp = gsi_to_irq(gsi);
 780                if (tmp == -1)
 781                        return -1;
 782                *irq = tmp;
 783        }
 784        return 0;
 785}
 786
 787int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
 788{
 789        if (isa_irq >= 16)
 790                return -1;
 791        *gsi = isa_irq;
 792        return 0;
 793}
 794
 795/*
 796 *  ACPI based hotplug CPU support
 797 */
 798#ifdef CONFIG_ACPI_HOTPLUG_CPU
 799int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 800{
 801#ifdef CONFIG_ACPI_NUMA
 802        /*
 803         * We don't have cpu-only-node hotadd. But if the system equips
 804         * SRAT table, pxm is already found and node is ready.
 805         * So, just pxm_to_nid(pxm) is OK.
 806         * This code here is for the system which doesn't have full SRAT
 807         * table for possible cpus.
 808         */
 809        node_cpuid[cpu].phys_id = physid;
 810        node_cpuid[cpu].nid = acpi_get_node(handle);
 811#endif
 812        return 0;
 813}
 814
 815int additional_cpus __initdata = -1;
 816
 817static __init int setup_additional_cpus(char *s)
 818{
 819        if (s)
 820                additional_cpus = simple_strtol(s, NULL, 0);
 821
 822        return 0;
 823}
 824
 825early_param("additional_cpus", setup_additional_cpus);
 826
 827/*
 828 * cpu_possible_mask should be static, it cannot change as CPUs
 829 * are onlined, or offlined. The reason is per-cpu data-structures
 830 * are allocated by some modules at init time, and dont expect to
 831 * do this dynamically on cpu arrival/departure.
 832 * cpu_present_mask on the other hand can change dynamically.
 833 * In case when cpu_hotplug is not compiled, then we resort to current
 834 * behaviour, which is cpu_possible == cpu_present.
 835 * - Ashok Raj
 836 *
 837 * Three ways to find out the number of additional hotplug CPUs:
 838 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 839 * - The user can overwrite it with additional_cpus=NUM
 840 * - Otherwise don't reserve additional CPUs.
 841 */
 842__init void prefill_possible_map(void)
 843{
 844        int i;
 845        int possible, disabled_cpus;
 846
 847        disabled_cpus = total_cpus - available_cpus;
 848
 849        if (additional_cpus == -1) {
 850                if (disabled_cpus > 0)
 851                        additional_cpus = disabled_cpus;
 852                else
 853                        additional_cpus = 0;
 854        }
 855
 856        possible = available_cpus + additional_cpus;
 857
 858        if (possible > nr_cpu_ids)
 859                possible = nr_cpu_ids;
 860
 861        printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 862                possible, max((possible - available_cpus), 0));
 863
 864        for (i = 0; i < possible; i++)
 865                set_cpu_possible(i, true);
 866}
 867
 868static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
 869{
 870        cpumask_t tmp_map;
 871        int cpu;
 872
 873        cpumask_complement(&tmp_map, cpu_present_mask);
 874        cpu = cpumask_first(&tmp_map);
 875        if (cpu >= nr_cpu_ids)
 876                return -EINVAL;
 877
 878        acpi_map_cpu2node(handle, cpu, physid);
 879
 880        set_cpu_present(cpu, true);
 881        ia64_cpu_to_sapicid[cpu] = physid;
 882
 883        acpi_processor_set_pdc(handle);
 884
 885        *pcpu = cpu;
 886        return (0);
 887}
 888
 889/* wrapper to silence section mismatch warning */
 890int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
 891                       int *pcpu)
 892{
 893        return _acpi_map_lsapic(handle, physid, pcpu);
 894}
 895EXPORT_SYMBOL(acpi_map_cpu);
 896
 897int acpi_unmap_cpu(int cpu)
 898{
 899        ia64_cpu_to_sapicid[cpu] = -1;
 900        set_cpu_present(cpu, false);
 901
 902#ifdef CONFIG_ACPI_NUMA
 903        /* NUMA specific cleanup's */
 904#endif
 905
 906        return (0);
 907}
 908EXPORT_SYMBOL(acpi_unmap_cpu);
 909#endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 910
 911#ifdef CONFIG_ACPI_NUMA
 912static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
 913                                    void *context, void **ret)
 914{
 915        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 916        union acpi_object *obj;
 917        struct acpi_madt_io_sapic *iosapic;
 918        unsigned int gsi_base;
 919        int node;
 920
 921        /* Only care about objects w/ a method that returns the MADT */
 922        if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 923                return AE_OK;
 924
 925        if (!buffer.length || !buffer.pointer)
 926                return AE_OK;
 927
 928        obj = buffer.pointer;
 929        if (obj->type != ACPI_TYPE_BUFFER ||
 930            obj->buffer.length < sizeof(*iosapic)) {
 931                kfree(buffer.pointer);
 932                return AE_OK;
 933        }
 934
 935        iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 936
 937        if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 938                kfree(buffer.pointer);
 939                return AE_OK;
 940        }
 941
 942        gsi_base = iosapic->global_irq_base;
 943
 944        kfree(buffer.pointer);
 945
 946        /* OK, it's an IOSAPIC MADT entry; associate it with a node */
 947        node = acpi_get_node(handle);
 948        if (node == NUMA_NO_NODE || !node_online(node) ||
 949            cpumask_empty(cpumask_of_node(node)))
 950                return AE_OK;
 951
 952        /* We know a gsi to node mapping! */
 953        map_iosapic_to_node(gsi_base, node);
 954        return AE_OK;
 955}
 956
 957static int __init
 958acpi_map_iosapics (void)
 959{
 960        acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 961        return 0;
 962}
 963
 964fs_initcall(acpi_map_iosapics);
 965#endif                          /* CONFIG_ACPI_NUMA */
 966
 967int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 968{
 969        int err;
 970
 971        if ((err = iosapic_init(phys_addr, gsi_base)))
 972                return err;
 973
 974#ifdef CONFIG_ACPI_NUMA
 975        acpi_map_iosapic(handle, 0, NULL, NULL);
 976#endif                          /* CONFIG_ACPI_NUMA */
 977
 978        return 0;
 979}
 980
 981EXPORT_SYMBOL(acpi_register_ioapic);
 982
 983int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 984{
 985        return iosapic_remove(gsi_base);
 986}
 987
 988EXPORT_SYMBOL(acpi_unregister_ioapic);
 989
 990/*
 991 * acpi_suspend_lowlevel() - save kernel state and suspend.
 992 *
 993 * TBD when when IA64 starts to support suspend...
 994 */
 995int acpi_suspend_lowlevel(void) { return 0; }
 996