arch/ia64/kernel/acpi.c

   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 <asm/io.h>
  48 #include <asm/iosapic.h>
  49 #include <asm/machvec.h>
  50 #include <asm/page.h>
  51 #include <asm/system.h>
  52 #include <asm/numa.h>
  53 #include <asm/sal.h>
  54 #include <asm/cyclone.h>
  55 #include <asm/xen/hypervisor.h>
  56
  57 #define BAD_MADT_ENTRY(entry, end) (                                        \
  58                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  59                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  60
  61 #define PREFIX                  "ACPI: "
  62
  63 void (*pm_idle) (void);
  64 EXPORT_SYMBOL(pm_idle);
  65 void (*pm_power_off) (void);
  66 EXPORT_SYMBOL(pm_power_off);
  67
  68 u32 acpi_rsdt_forced;
  69 unsigned int acpi_cpei_override;
  70 unsigned int acpi_cpei_phys_cpuid;
  71
  72 unsigned long acpi_wakeup_address = 0;
  73
  74 #ifdef CONFIG_IA64_GENERIC
  75 static unsigned long __init acpi_find_rsdp(void)
  76 {
  77         unsigned long rsdp_phys = 0;
  78
  79         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  80                 rsdp_phys = efi.acpi20;
  81         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  82                 printk(KERN_WARNING PREFIX
  83                        "v1.0/r0.71 tables no longer supported\n");
  84         return rsdp_phys;
  85 }
  86 #endif
  87
  88 const char __init *
  89 acpi_get_sysname(void)
  90 {
  91 #ifdef CONFIG_IA64_GENERIC
  92         unsigned long rsdp_phys;
  93         struct acpi_table_rsdp *rsdp;
  94         struct acpi_table_xsdt *xsdt;
  95         struct acpi_table_header *hdr;
  96 #ifdef CONFIG_DMAR
  97         u64 i, nentries;
  98 #endif
  99
 100         rsdp_phys = acpi_find_rsdp();
 101         if (!rsdp_phys) {
 102                 printk(KERN_ERR
 103                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
 104                 return "dig";
 105         }
 106
 107         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
 108         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
 109                 printk(KERN_ERR
 110                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 111                 return "dig";
 112         }
 113
 114         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 115         hdr = &xsdt->header;
 116         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 117                 printk(KERN_ERR
 118                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 119                 return "dig";
 120         }
 121
 122         if (!strcmp(hdr->oem_id, "HP")) {
 123                 return "hpzx1";
 124         } else if (!strcmp(hdr->oem_id, "SGI")) {
 125                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
 126                         return "uv";
 127                 else
 128                         return "sn2";
 129         } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
 130                 return "xen";
 131         }
 132
 133 #ifdef CONFIG_DMAR
 134         /* Look for Intel IOMMU */
 135         nentries = (hdr->length - sizeof(*hdr)) /
 136                          sizeof(xsdt->table_offset_entry[0]);
 137         for (i = 0; i < nentries; i++) {
 138                 hdr = __va(xsdt->table_offset_entry[i]);
 139                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
 140                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
 141                         return "dig_vtd";
 142         }
 143 #endif
 144
 145         return "dig";
 146 #else
 147 # if defined (CONFIG_IA64_HP_SIM)
 148         return "hpsim";
 149 # elif defined (CONFIG_IA64_HP_ZX1)
 150         return "hpzx1";
 151 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
 152         return "hpzx1_swiotlb";
 153 # elif defined (CONFIG_IA64_SGI_SN2)
 154         return "sn2";
 155 # elif defined (CONFIG_IA64_SGI_UV)
 156         return "uv";
 157 # elif defined (CONFIG_IA64_DIG)
 158         return "dig";
 159 # elif defined (CONFIG_IA64_XEN_GUEST)
 160         return "xen";
 161 # elif defined(CONFIG_IA64_DIG_VTD)
 162         return "dig_vtd";
 163 # else
 164 #       error Unknown platform.  Fix acpi.c.
 165 # endif
 166 #endif
 167 }
 168
 169 #ifdef CONFIG_ACPI
 170
 171 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 172
 173 /* Array to record platform interrupt vectors for generic interrupt routing. */
 174 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 175         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 176 };
 177
 178 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 179
 180 /*
 181  * Interrupt routing API for device drivers.  Provides interrupt vector for
 182  * a generic platform event.  Currently only CPEI is implemented.
 183  */
 184 int acpi_request_vector(u32 int_type)
 185 {
 186         int vector = -1;
 187
 188         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 189                 /* corrected platform error interrupt */
 190                 vector = platform_intr_list[int_type];
 191         } else
 192                 printk(KERN_ERR
 193                        "acpi_request_vector(): invalid interrupt type\n");
 194         return vector;
 195 }
 196
 197 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 198 {
 199         return __va(phys_addr);
 200 }
 201
 202 void __init __acpi_unmap_table(char *map, unsigned long size)
 203 {
 204 }
 205
 206 /* --------------------------------------------------------------------------
 207                             Boot-time Table Parsing
 208    -------------------------------------------------------------------------- */
 209
 210 static int available_cpus __initdata;
 211 struct acpi_table_madt *acpi_madt __initdata;
 212 static u8 has_8259;
 213
 214 static int __init
 215 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 216                           const unsigned long end)
 217 {
 218         struct acpi_madt_local_apic_override *lapic;
 219
 220         lapic = (struct acpi_madt_local_apic_override *)header;
 221
 222         if (BAD_MADT_ENTRY(lapic, end))
 223                 return -EINVAL;
 224
 225         if (lapic->address) {
 226                 iounmap(ipi_base_addr);
 227                 ipi_base_addr = ioremap(lapic->address, 0);
 228         }
 229         return 0;
 230 }
 231
 232 static int __init
 233 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 234 {
 235         struct acpi_madt_local_sapic *lsapic;
 236
 237         lsapic = (struct acpi_madt_local_sapic *)header;
 238
 239         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 240
 241         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 242 #ifdef CONFIG_SMP
 243                 smp_boot_data.cpu_phys_id[available_cpus] =
 244                     (lsapic->id << 8) | lsapic->eid;
 245 #endif
 246                 ++available_cpus;
 247         }
 248
 249         total_cpus++;
 250         return 0;
 251 }
 252
 253 static int __init
 254 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 255 {
 256         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 257
 258         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 259
 260         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 261                 return -EINVAL;
 262
 263         /* TBD: Support lapic_nmi entries */
 264         return 0;
 265 }
 266
 267 static int __init
 268 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 269 {
 270         struct acpi_madt_io_sapic *iosapic;
 271
 272         iosapic = (struct acpi_madt_io_sapic *)header;
 273
 274         if (BAD_MADT_ENTRY(iosapic, end))
 275                 return -EINVAL;
 276
 277         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 278 }
 279
 280 static unsigned int __initdata acpi_madt_rev;
 281
 282 static int __init
 283 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 284                         const unsigned long end)
 285 {
 286         struct acpi_madt_interrupt_source *plintsrc;
 287         int vector;
 288
 289         plintsrc = (struct acpi_madt_interrupt_source *)header;
 290
 291         if (BAD_MADT_ENTRY(plintsrc, end))
 292                 return -EINVAL;
 293
 294         /*
 295          * Get vector assignment for this interrupt, set attributes,
 296          * and program the IOSAPIC routing table.
 297          */
 298         vector = iosapic_register_platform_intr(plintsrc->type,
 299                                                 plintsrc->global_irq,
 300                                                 plintsrc->io_sapic_vector,
 301                                                 plintsrc->eid,
 302                                                 plintsrc->id,
 303                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 304                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 305                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 306                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 307                                                  ACPI_MADT_TRIGGER_EDGE) ?
 308                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 309
 310         platform_intr_list[plintsrc->type] = vector;
 311         if (acpi_madt_rev > 1) {
 312                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 313         }
 314
 315         /*
 316          * Save the physical id, so we can check when its being removed
 317          */
 318         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 319
 320         return 0;
 321 }
 322
 323 #ifdef CONFIG_HOTPLUG_CPU
 324 unsigned int can_cpei_retarget(void)
 325 {
 326         extern int cpe_vector;
 327         extern unsigned int force_cpei_retarget;
 328
 329         /*
 330          * Only if CPEI is supported and the override flag
 331          * is present, otherwise return that its re-targettable
 332          * if we are in polling mode.
 333          */
 334         if (cpe_vector > 0) {
 335                 if (acpi_cpei_override || force_cpei_retarget)
 336                         return 1;
 337                 else
 338                         return 0;
 339         }
 340         return 1;
 341 }
 342
 343 unsigned int is_cpu_cpei_target(unsigned int cpu)
 344 {
 345         unsigned int logical_id;
 346
 347         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 348
 349         if (logical_id == cpu)
 350                 return 1;
 351         else
 352                 return 0;
 353 }
 354
 355 void set_cpei_target_cpu(unsigned int cpu)
 356 {
 357         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 358 }
 359 #endif
 360
 361 unsigned int get_cpei_target_cpu(void)
 362 {
 363         return acpi_cpei_phys_cpuid;
 364 }
 365
 366 static int __init
 367 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 368                        const unsigned long end)
 369 {
 370         struct acpi_madt_interrupt_override *p;
 371
 372         p = (struct acpi_madt_interrupt_override *)header;
 373
 374         if (BAD_MADT_ENTRY(p, end))
 375                 return -EINVAL;
 376
 377         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 378                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 379                                   ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 380                                  IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 381                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 382                                  ACPI_MADT_TRIGGER_EDGE) ?
 383                                  IOSAPIC_EDGE : IOSAPIC_LEVEL);
 384         return 0;
 385 }
 386
 387 static int __init
 388 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 389 {
 390         struct acpi_madt_nmi_source *nmi_src;
 391
 392         nmi_src = (struct acpi_madt_nmi_source *)header;
 393
 394         if (BAD_MADT_ENTRY(nmi_src, end))
 395                 return -EINVAL;
 396
 397         /* TBD: Support nimsrc entries */
 398         return 0;
 399 }
 400
 401 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 402 {
 403         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 404
 405                 /*
 406                  * Unfortunately ITC_DRIFT is not yet part of the
 407                  * official SAL spec, so the ITC_DRIFT bit is not
 408                  * set by the BIOS on this hardware.
 409                  */
 410                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 411
 412                 cyclone_setup();
 413         }
 414 }
 415
 416 static int __init acpi_parse_madt(struct acpi_table_header *table)
 417 {
 418         if (!table)
 419                 return -EINVAL;
 420
 421         acpi_madt = (struct acpi_table_madt *)table;
 422
 423         acpi_madt_rev = acpi_madt->header.revision;
 424
 425         /* remember the value for reference after free_initmem() */
 426 #ifdef CONFIG_ITANIUM
 427         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 428 #else
 429         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 430 #endif
 431         iosapic_system_init(has_8259);
 432
 433         /* Get base address of IPI Message Block */
 434
 435         if (acpi_madt->address)
 436                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 437
 438         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 439
 440         acpi_madt_oem_check(acpi_madt->header.oem_id,
 441                             acpi_madt->header.oem_table_id);
 442
 443         return 0;
 444 }
 445
 446 #ifdef CONFIG_ACPI_NUMA
 447
 448 #undef SLIT_DEBUG
 449
 450 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 451
 452 static int __initdata srat_num_cpus;    /* number of cpus */
 453 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 454 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 455 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 456 static struct acpi_table_slit __initdata *slit_table;
 457 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 458
 459 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 460 {
 461         int pxm;
 462
 463         pxm = pa->proximity_domain_lo;
 464         if (ia64_platform_is("sn2"))
 465                 pxm += pa->proximity_domain_hi[0] << 8;
 466         return pxm;
 467 }
 468
 469 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 470 {
 471         int pxm;
 472
 473         pxm = ma->proximity_domain;
 474         if (!ia64_platform_is("sn2"))
 475                 pxm &= 0xff;
 476
 477         return pxm;
 478 }
 479
 480 /*
 481  * ACPI 2.0 SLIT (System Locality Information Table)
 482  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 483  */
 484 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 485 {
 486         u32 len;
 487
 488         len = sizeof(struct acpi_table_header) + 8
 489             + slit->locality_count * slit->locality_count;
 490         if (slit->header.length != len) {
 491                 printk(KERN_ERR
 492                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 493                        len, slit->header.length);
 494                 return;
 495         }
 496         slit_table = slit;
 497 }
 498
 499 void __init
 500 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 501 {
 502         int pxm;
 503
 504         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 505                 return;
 506
 507         pxm = get_processor_proximity_domain(pa);
 508
 509         /* record this node in proximity bitmap */
 510         pxm_bit_set(pxm);
 511
 512         node_cpuid[srat_num_cpus].phys_id =
 513             (pa->apic_id << 8) | (pa->local_sapic_eid);
 514         /* nid should be overridden as logical node id later */
 515         node_cpuid[srat_num_cpus].nid = pxm;
 516         cpu_set(srat_num_cpus, early_cpu_possible_map);
 517         srat_num_cpus++;
 518 }
 519
 520 void __init
 521 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 522 {
 523         unsigned long paddr, size;
 524         int pxm;
 525         struct node_memblk_s *p, *q, *pend;
 526
 527         pxm = get_memory_proximity_domain(ma);
 528
 529         /* fill node memory chunk structure */
 530         paddr = ma->base_address;
 531         size = ma->length;
 532
 533         /* Ignore disabled entries */
 534         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 535                 return;
 536
 537         /* record this node in proximity bitmap */
 538         pxm_bit_set(pxm);
 539
 540         /* Insertion sort based on base address */
 541         pend = &node_memblk[num_node_memblks];
 542         for (p = &node_memblk[0]; p < pend; p++) {
 543                 if (paddr < p->start_paddr)
 544                         break;
 545         }
 546         if (p < pend) {
 547                 for (q = pend - 1; q >= p; q--)
 548                         *(q + 1) = *q;
 549         }
 550         p->start_paddr = paddr;
 551         p->size = size;
 552         p->nid = pxm;
 553         num_node_memblks++;
 554 }
 555
 556 void __init acpi_numa_arch_fixup(void)
 557 {
 558         int i, j, node_from, node_to;
 559
 560         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 561         if (srat_num_cpus == 0) {
 562                 node_set_online(0);
 563                 node_cpuid[0].phys_id = hard_smp_processor_id();
 564                 return;
 565         }
 566
 567         /*
 568          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 569          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 570          */
 571         nodes_clear(node_online_map);
 572         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 573                 if (pxm_bit_test(i)) {
 574                         int nid = acpi_map_pxm_to_node(i);
 575                         node_set_online(nid);
 576                 }
 577         }
 578
 579         /* set logical node id in memory chunk structure */
 580         for (i = 0; i < num_node_memblks; i++)
 581                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 582
 583         /* assign memory bank numbers for each chunk on each node */
 584         for_each_online_node(i) {
 585                 int bank;
 586
 587                 bank = 0;
 588                 for (j = 0; j < num_node_memblks; j++)
 589                         if (node_memblk[j].nid == i)
 590                                 node_memblk[j].bank = bank++;
 591         }
 592
 593         /* set logical node id in cpu structure */
 594         for_each_possible_early_cpu(i)
 595                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 596
 597         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 598                num_online_nodes());
 599         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 600                num_node_memblks);
 601
 602         if (!slit_table) {
 603                 for (i = 0; i < MAX_NUMNODES; i++)
 604                         for (j = 0; j < MAX_NUMNODES; j++)
 605                                 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
 606                                                         REMOTE_DISTANCE;
 607                 return;
 608         }
 609
 610         memset(numa_slit, -1, sizeof(numa_slit));
 611         for (i = 0; i < slit_table->locality_count; i++) {
 612                 if (!pxm_bit_test(i))
 613                         continue;
 614                 node_from = pxm_to_node(i);
 615                 for (j = 0; j < slit_table->locality_count; j++) {
 616                         if (!pxm_bit_test(j))
 617                                 continue;
 618                         node_to = pxm_to_node(j);
 619                         node_distance(node_from, node_to) =
 620                             slit_table->entry[i * slit_table->locality_count + j];
 621                 }
 622         }
 623
 624 #ifdef SLIT_DEBUG
 625         printk("ACPI 2.0 SLIT locality table:\n");
 626         for_each_online_node(i) {
 627                 for_each_online_node(j)
 628                     printk("%03d ", node_distance(i, j));
 629                 printk("\n");
 630         }
 631 #endif
 632 }
 633 #endif                          /* CONFIG_ACPI_NUMA */
 634
 635 /*
 636  * success: return IRQ number (>=0)
 637  * failure: return < 0
 638  */
 639 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
 640 {
 641         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 642                 return gsi;
 643
 644         if (has_8259 && gsi < 16)
 645                 return isa_irq_to_vector(gsi);
 646
 647         return iosapic_register_intr(gsi,
 648                                      (polarity ==
 649                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 650                                      IOSAPIC_POL_LOW,
 651                                      (triggering ==
 652                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 653                                      IOSAPIC_LEVEL);
 654 }
 655
 656 void acpi_unregister_gsi(u32 gsi)
 657 {
 658         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 659                 return;
 660
 661         if (has_8259 && gsi < 16)
 662                 return;
 663
 664         iosapic_unregister_intr(gsi);
 665 }
 666
 667 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 668 {
 669         struct acpi_table_header *fadt_header;
 670         struct acpi_table_fadt *fadt;
 671
 672         if (!table)
 673                 return -EINVAL;
 674
 675         fadt_header = (struct acpi_table_header *)table;
 676         if (fadt_header->revision != 3)
 677                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 678
 679         fadt = (struct acpi_table_fadt *)fadt_header;
 680
 681         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
 682                                  ACPI_ACTIVE_LOW);
 683         return 0;
 684 }
 685
 686 int __init early_acpi_boot_init(void)
 687 {
 688         int ret;
 689
 690         /*
 691          * do a partial walk of MADT to determine how many CPUs
 692          * we have including offline CPUs
 693          */
 694         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 695                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 696                 return 0;
 697         }
 698
 699         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 700                 acpi_parse_lsapic, NR_CPUS);
 701         if (ret < 1)
 702                 printk(KERN_ERR PREFIX
 703                        "Error parsing MADT - no LAPIC entries\n");
 704
 705         return 0;
 706 }
 707
 708
 709
 710 int __init acpi_boot_init(void)
 711 {
 712
 713         /*
 714          * MADT
 715          * ----
 716          * Parse the Multiple APIC Description Table (MADT), if exists.
 717          * Note that this table provides platform SMP configuration
 718          * information -- the successor to MPS tables.
 719          */
 720
 721         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 722                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 723                 goto skip_madt;
 724         }
 725
 726         /* Local APIC */
 727
 728         if (acpi_table_parse_madt
 729             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 730                 printk(KERN_ERR PREFIX
 731                        "Error parsing LAPIC address override entry\n");
 732
 733         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 734             < 0)
 735                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 736
 737         /* I/O APIC */
 738
 739         if (acpi_table_parse_madt
 740             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 741                 if (!ia64_platform_is("sn2"))
 742                         printk(KERN_ERR PREFIX
 743                                "Error parsing MADT - no IOSAPIC entries\n");
 744         }
 745
 746         /* System-Level Interrupt Routing */
 747
 748         if (acpi_table_parse_madt
 749             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 750              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 751                 printk(KERN_ERR PREFIX
 752                        "Error parsing platform interrupt source entry\n");
 753
 754         if (acpi_table_parse_madt
 755             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 756                 printk(KERN_ERR PREFIX
 757                        "Error parsing interrupt source overrides entry\n");
 758
 759         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 760                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 761       skip_madt:
 762
 763         /*
 764          * FADT says whether a legacy keyboard controller is present.
 765          * The FADT also contains an SCI_INT line, by which the system
 766          * gets interrupts such as power and sleep buttons.  If it's not
 767          * on a Legacy interrupt, it needs to be setup.
 768          */
 769         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 770                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 771
 772 #ifdef CONFIG_SMP
 773         if (available_cpus == 0) {
 774                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 775                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 776                 smp_boot_data.cpu_phys_id[available_cpus] =
 777                     hard_smp_processor_id();
 778                 available_cpus = 1;     /* We've got at least one of these, no? */
 779         }
 780         smp_boot_data.cpu_count = available_cpus;
 781
 782         smp_build_cpu_map();
 783 # ifdef CONFIG_ACPI_NUMA
 784         if (srat_num_cpus == 0) {
 785                 int cpu, i = 1;
 786                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 787                         if (smp_boot_data.cpu_phys_id[cpu] !=
 788                             hard_smp_processor_id())
 789                                 node_cpuid[i++].phys_id =
 790                                     smp_boot_data.cpu_phys_id[cpu];
 791         }
 792 # endif
 793 #endif
 794 #ifdef CONFIG_ACPI_NUMA
 795         build_cpu_to_node_map();
 796 #endif
 797         /* Make boot-up look pretty */
 798         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 799                total_cpus);
 800         return 0;
 801 }
 802
 803 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 804 {
 805         int tmp;
 806
 807         if (has_8259 && gsi < 16)
 808                 *irq = isa_irq_to_vector(gsi);
 809         else {
 810                 tmp = gsi_to_irq(gsi);
 811                 if (tmp == -1)
 812                         return -1;
 813                 *irq = tmp;
 814         }
 815         return 0;
 816 }
 817
 818 /*
 819  *  ACPI based hotplug CPU support
 820  */
 821 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 822 static
 823 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 824 {
 825 #ifdef CONFIG_ACPI_NUMA
 826         int pxm_id;
 827         int nid;
 828
 829         pxm_id = acpi_get_pxm(handle);
 830         /*
 831          * We don't have cpu-only-node hotadd. But if the system equips
 832          * SRAT table, pxm is already found and node is ready.
 833          * So, just pxm_to_nid(pxm) is OK.
 834          * This code here is for the system which doesn't have full SRAT
 835          * table for possible cpus.
 836          */
 837         nid = acpi_map_pxm_to_node(pxm_id);
 838         node_cpuid[cpu].phys_id = physid;
 839         node_cpuid[cpu].nid = nid;
 840 #endif
 841         return (0);
 842 }
 843
 844 int additional_cpus __initdata = -1;
 845
 846 static __init int setup_additional_cpus(char *s)
 847 {
 848         if (s)
 849                 additional_cpus = simple_strtol(s, NULL, 0);
 850
 851         return 0;
 852 }
 853
 854 early_param("additional_cpus", setup_additional_cpus);
 855
 856 /*
 857  * cpu_possible_map should be static, it cannot change as CPUs
 858  * are onlined, or offlined. The reason is per-cpu data-structures
 859  * are allocated by some modules at init time, and dont expect to
 860  * do this dynamically on cpu arrival/departure.
 861  * cpu_present_map on the other hand can change dynamically.
 862  * In case when cpu_hotplug is not compiled, then we resort to current
 863  * behaviour, which is cpu_possible == cpu_present.
 864  * - Ashok Raj
 865  *
 866  * Three ways to find out the number of additional hotplug CPUs:
 867  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 868  * - The user can overwrite it with additional_cpus=NUM
 869  * - Otherwise don't reserve additional CPUs.
 870  */
 871 __init void prefill_possible_map(void)
 872 {
 873         int i;
 874         int possible, disabled_cpus;
 875
 876         disabled_cpus = total_cpus - available_cpus;
 877
 878         if (additional_cpus == -1) {
 879                 if (disabled_cpus > 0)
 880                         additional_cpus = disabled_cpus;
 881                 else
 882                         additional_cpus = 0;
 883         }
 884
 885         possible = available_cpus + additional_cpus;
 886
 887         if (possible > NR_CPUS)
 888                 possible = NR_CPUS;
 889
 890         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 891                 possible, max((possible - available_cpus), 0));
 892
 893         for (i = 0; i < possible; i++)
 894                 set_cpu_possible(i, true);
 895 }
 896
 897 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 898 {
 899         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 900         union acpi_object *obj;
 901         struct acpi_madt_local_sapic *lsapic;
 902         cpumask_t tmp_map;
 903         int cpu, physid;
 904
 905         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 906                 return -EINVAL;
 907
 908         if (!buffer.length || !buffer.pointer)
 909                 return -EINVAL;
 910
 911         obj = buffer.pointer;
 912         if (obj->type != ACPI_TYPE_BUFFER)
 913         {
 914                 kfree(buffer.pointer);
 915                 return -EINVAL;
 916         }
 917
 918         lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
 919
 920         if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
 921             (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
 922                 kfree(buffer.pointer);
 923                 return -EINVAL;
 924         }
 925
 926         physid = ((lsapic->id << 8) | (lsapic->eid));
 927
 928         kfree(buffer.pointer);
 929         buffer.length = ACPI_ALLOCATE_BUFFER;
 930         buffer.pointer = NULL;
 931
 932         cpumask_complement(&tmp_map, cpu_present_mask);
 933         cpu = cpumask_first(&tmp_map);
 934         if (cpu >= nr_cpu_ids)
 935                 return -EINVAL;
 936
 937         acpi_map_cpu2node(handle, cpu, physid);
 938
 939         cpu_set(cpu, cpu_present_map);
 940         ia64_cpu_to_sapicid[cpu] = physid;
 941
 942         *pcpu = cpu;
 943         return (0);
 944 }
 945
 946 EXPORT_SYMBOL(acpi_map_lsapic);
 947
 948 int acpi_unmap_lsapic(int cpu)
 949 {
 950         ia64_cpu_to_sapicid[cpu] = -1;
 951         cpu_clear(cpu, cpu_present_map);
 952
 953 #ifdef CONFIG_ACPI_NUMA
 954         /* NUMA specific cleanup's */
 955 #endif
 956
 957         return (0);
 958 }
 959
 960 EXPORT_SYMBOL(acpi_unmap_lsapic);
 961 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 962
 963 #ifdef CONFIG_ACPI_NUMA
 964 static acpi_status __devinit
 965 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
 966 {
 967         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 968         union acpi_object *obj;
 969         struct acpi_madt_io_sapic *iosapic;
 970         unsigned int gsi_base;
 971         int pxm, node;
 972
 973         /* Only care about objects w/ a method that returns the MADT */
 974         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 975                 return AE_OK;
 976
 977         if (!buffer.length || !buffer.pointer)
 978                 return AE_OK;
 979
 980         obj = buffer.pointer;
 981         if (obj->type != ACPI_TYPE_BUFFER ||
 982             obj->buffer.length < sizeof(*iosapic)) {
 983                 kfree(buffer.pointer);
 984                 return AE_OK;
 985         }
 986
 987         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 988
 989         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 990                 kfree(buffer.pointer);
 991                 return AE_OK;
 992         }
 993
 994         gsi_base = iosapic->global_irq_base;
 995
 996         kfree(buffer.pointer);
 997
 998         /*
 999          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
1000          * us which node to associate this with.
1001          */
1002         pxm = acpi_get_pxm(handle);
1003         if (pxm < 0)
1004                 return AE_OK;
1005
1006         node = pxm_to_node(pxm);
1007
1008         if (node >= MAX_NUMNODES || !node_online(node) ||
1009             cpumask_empty(cpumask_of_node(node)))
1010                 return AE_OK;
1011
1012         /* We know a gsi to node mapping! */
1013         map_iosapic_to_node(gsi_base, node);
1014         return AE_OK;
1015 }
1016
1017 static int __init
1018 acpi_map_iosapics (void)
1019 {
1020         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
1021         return 0;
1022 }
1023
1024 fs_initcall(acpi_map_iosapics);
1025 #endif                          /* CONFIG_ACPI_NUMA */
1026
1027 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
1028 {
1029         int err;
1030
1031         if ((err = iosapic_init(phys_addr, gsi_base)))
1032                 return err;
1033
1034 #ifdef CONFIG_ACPI_NUMA
1035         acpi_map_iosapic(handle, 0, NULL, NULL);
1036 #endif                          /* CONFIG_ACPI_NUMA */
1037
1038         return 0;
1039 }
1040
1041 EXPORT_SYMBOL(acpi_register_ioapic);
1042
1043 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1044 {
1045         return iosapic_remove(gsi_base);
1046 }
1047
1048 EXPORT_SYMBOL(acpi_unregister_ioapic);
1049
1050 /*
1051  * acpi_save_state_mem() - save kernel state
1052  *
1053  * TBD when when IA64 starts to support suspend...
1054  */
1055 int acpi_save_state_mem(void) { return 0; }
1056
1057 /*
1058  * acpi_restore_state()
1059  */
1060 void acpi_restore_state_mem(void) {}
1061
1062 /*
1063  * do_suspend_lowlevel()
1064  */
1065 void do_suspend_lowlevel(void) {}
1066
1067 #endif                          /* CONFIG_ACPI */