Pileus Git - ~andy/linux/blob - 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 <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 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 unsigned int acpi_cpei_override;
  64 unsigned int acpi_cpei_phys_cpuid;
  65
  66 unsigned long acpi_wakeup_address = 0;
  67
  68 #ifdef CONFIG_IA64_GENERIC
  69 static unsigned long __init acpi_find_rsdp(void)
  70 {
  71         unsigned long rsdp_phys = 0;
  72
  73         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  74                 rsdp_phys = efi.acpi20;
  75         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  76                 printk(KERN_WARNING PREFIX
  77                        "v1.0/r0.71 tables no longer supported\n");
  78         return rsdp_phys;
  79 }
  80
  81 const char __init *
  82 acpi_get_sysname(void)
  83 {
  84         unsigned long rsdp_phys;
  85         struct acpi_table_rsdp *rsdp;
  86         struct acpi_table_xsdt *xsdt;
  87         struct acpi_table_header *hdr;
  88 #ifdef CONFIG_INTEL_IOMMU
  89         u64 i, nentries;
  90 #endif
  91
  92         rsdp_phys = acpi_find_rsdp();
  93         if (!rsdp_phys) {
  94                 printk(KERN_ERR
  95                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  96                 return "dig";
  97         }
  98
  99         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
 100         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
 101                 printk(KERN_ERR
 102                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 103                 return "dig";
 104         }
 105
 106         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 107         hdr = &xsdt->header;
 108         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 109                 printk(KERN_ERR
 110                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 111                 return "dig";
 112         }
 113
 114         if (!strcmp(hdr->oem_id, "HP")) {
 115                 return "hpzx1";
 116         } else if (!strcmp(hdr->oem_id, "SGI")) {
 117                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
 118                         return "uv";
 119                 else
 120                         return "sn2";
 121         }
 122
 123 #ifdef CONFIG_INTEL_IOMMU
 124         /* Look for Intel IOMMU */
 125         nentries = (hdr->length - sizeof(*hdr)) /
 126                          sizeof(xsdt->table_offset_entry[0]);
 127         for (i = 0; i < nentries; i++) {
 128                 hdr = __va(xsdt->table_offset_entry[i]);
 129                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
 130                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
 131                         return "dig_vtd";
 132         }
 133 #endif
 134
 135         return "dig";
 136 }
 137 #endif /* CONFIG_IA64_GENERIC */
 138
 139 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 140
 141 /* Array to record platform interrupt vectors for generic interrupt routing. */
 142 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 143         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 144 };
 145
 146 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 147
 148 /*
 149  * Interrupt routing API for device drivers.  Provides interrupt vector for
 150  * a generic platform event.  Currently only CPEI is implemented.
 151  */
 152 int acpi_request_vector(u32 int_type)
 153 {
 154         int vector = -1;
 155
 156         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 157                 /* corrected platform error interrupt */
 158                 vector = platform_intr_list[int_type];
 159         } else
 160                 printk(KERN_ERR
 161                        "acpi_request_vector(): invalid interrupt type\n");
 162         return vector;
 163 }
 164
 165 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 166 {
 167         return __va(phys_addr);
 168 }
 169
 170 void __init __acpi_unmap_table(char *map, unsigned long size)
 171 {
 172 }
 173
 174 /* --------------------------------------------------------------------------
 175                             Boot-time Table Parsing
 176    -------------------------------------------------------------------------- */
 177
 178 static int available_cpus __initdata;
 179 struct acpi_table_madt *acpi_madt __initdata;
 180 static u8 has_8259;
 181
 182 static int __init
 183 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 184                           const unsigned long end)
 185 {
 186         struct acpi_madt_local_apic_override *lapic;
 187
 188         lapic = (struct acpi_madt_local_apic_override *)header;
 189
 190         if (BAD_MADT_ENTRY(lapic, end))
 191                 return -EINVAL;
 192
 193         if (lapic->address) {
 194                 iounmap(ipi_base_addr);
 195                 ipi_base_addr = ioremap(lapic->address, 0);
 196         }
 197         return 0;
 198 }
 199
 200 static int __init
 201 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 202 {
 203         struct acpi_madt_local_sapic *lsapic;
 204
 205         lsapic = (struct acpi_madt_local_sapic *)header;
 206
 207         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 208
 209         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 210 #ifdef CONFIG_SMP
 211                 smp_boot_data.cpu_phys_id[available_cpus] =
 212                     (lsapic->id << 8) | lsapic->eid;
 213 #endif
 214                 ++available_cpus;
 215         }
 216
 217         total_cpus++;
 218         return 0;
 219 }
 220
 221 static int __init
 222 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 223 {
 224         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 225
 226         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 227
 228         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 229                 return -EINVAL;
 230
 231         /* TBD: Support lapic_nmi entries */
 232         return 0;
 233 }
 234
 235 static int __init
 236 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 237 {
 238         struct acpi_madt_io_sapic *iosapic;
 239
 240         iosapic = (struct acpi_madt_io_sapic *)header;
 241
 242         if (BAD_MADT_ENTRY(iosapic, end))
 243                 return -EINVAL;
 244
 245         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 246 }
 247
 248 static unsigned int __initdata acpi_madt_rev;
 249
 250 static int __init
 251 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 252                         const unsigned long end)
 253 {
 254         struct acpi_madt_interrupt_source *plintsrc;
 255         int vector;
 256
 257         plintsrc = (struct acpi_madt_interrupt_source *)header;
 258
 259         if (BAD_MADT_ENTRY(plintsrc, end))
 260                 return -EINVAL;
 261
 262         /*
 263          * Get vector assignment for this interrupt, set attributes,
 264          * and program the IOSAPIC routing table.
 265          */
 266         vector = iosapic_register_platform_intr(plintsrc->type,
 267                                                 plintsrc->global_irq,
 268                                                 plintsrc->io_sapic_vector,
 269                                                 plintsrc->eid,
 270                                                 plintsrc->id,
 271                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 272                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 273                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 274                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 275                                                  ACPI_MADT_TRIGGER_EDGE) ?
 276                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 277
 278         platform_intr_list[plintsrc->type] = vector;
 279         if (acpi_madt_rev > 1) {
 280                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 281         }
 282
 283         /*
 284          * Save the physical id, so we can check when its being removed
 285          */
 286         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 287
 288         return 0;
 289 }
 290
 291 #ifdef CONFIG_HOTPLUG_CPU
 292 unsigned int can_cpei_retarget(void)
 293 {
 294         extern int cpe_vector;
 295         extern unsigned int force_cpei_retarget;
 296
 297         /*
 298          * Only if CPEI is supported and the override flag
 299          * is present, otherwise return that its re-targettable
 300          * if we are in polling mode.
 301          */
 302         if (cpe_vector > 0) {
 303                 if (acpi_cpei_override || force_cpei_retarget)
 304                         return 1;
 305                 else
 306                         return 0;
 307         }
 308         return 1;
 309 }
 310
 311 unsigned int is_cpu_cpei_target(unsigned int cpu)
 312 {
 313         unsigned int logical_id;
 314
 315         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 316
 317         if (logical_id == cpu)
 318                 return 1;
 319         else
 320                 return 0;
 321 }
 322
 323 void set_cpei_target_cpu(unsigned int cpu)
 324 {
 325         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 326 }
 327 #endif
 328
 329 unsigned int get_cpei_target_cpu(void)
 330 {
 331         return acpi_cpei_phys_cpuid;
 332 }
 333
 334 static int __init
 335 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 336                        const unsigned long end)
 337 {
 338         struct acpi_madt_interrupt_override *p;
 339
 340         p = (struct acpi_madt_interrupt_override *)header;
 341
 342         if (BAD_MADT_ENTRY(p, end))
 343                 return -EINVAL;
 344
 345         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 346                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 347                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
 348                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
 349                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 350                                  ACPI_MADT_TRIGGER_LEVEL) ?
 351                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
 352         return 0;
 353 }
 354
 355 static int __init
 356 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 357 {
 358         struct acpi_madt_nmi_source *nmi_src;
 359
 360         nmi_src = (struct acpi_madt_nmi_source *)header;
 361
 362         if (BAD_MADT_ENTRY(nmi_src, end))
 363                 return -EINVAL;
 364
 365         /* TBD: Support nimsrc entries */
 366         return 0;
 367 }
 368
 369 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 370 {
 371         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 372
 373                 /*
 374                  * Unfortunately ITC_DRIFT is not yet part of the
 375                  * official SAL spec, so the ITC_DRIFT bit is not
 376                  * set by the BIOS on this hardware.
 377                  */
 378                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 379
 380                 cyclone_setup();
 381         }
 382 }
 383
 384 static int __init acpi_parse_madt(struct acpi_table_header *table)
 385 {
 386         if (!table)
 387                 return -EINVAL;
 388
 389         acpi_madt = (struct acpi_table_madt *)table;
 390
 391         acpi_madt_rev = acpi_madt->header.revision;
 392
 393         /* remember the value for reference after free_initmem() */
 394 #ifdef CONFIG_ITANIUM
 395         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 396 #else
 397         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 398 #endif
 399         iosapic_system_init(has_8259);
 400
 401         /* Get base address of IPI Message Block */
 402
 403         if (acpi_madt->address)
 404                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 405
 406         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 407
 408         acpi_madt_oem_check(acpi_madt->header.oem_id,
 409                             acpi_madt->header.oem_table_id);
 410
 411         return 0;
 412 }
 413
 414 #ifdef CONFIG_ACPI_NUMA
 415
 416 #undef SLIT_DEBUG
 417
 418 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 419
 420 static int __initdata srat_num_cpus;    /* number of cpus */
 421 static u32 pxm_flag[PXM_FLAG_LEN];
 422 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 423 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 424 static struct acpi_table_slit __initdata *slit_table;
 425 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 426
 427 static int __init
 428 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 429 {
 430         int pxm;
 431
 432         pxm = pa->proximity_domain_lo;
 433         if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
 434                 pxm += pa->proximity_domain_hi[0] << 8;
 435         return pxm;
 436 }
 437
 438 static int __init
 439 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 440 {
 441         int pxm;
 442
 443         pxm = ma->proximity_domain;
 444         if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
 445                 pxm &= 0xff;
 446
 447         return pxm;
 448 }
 449
 450 /*
 451  * ACPI 2.0 SLIT (System Locality Information Table)
 452  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 453  */
 454 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 455 {
 456         u32 len;
 457
 458         len = sizeof(struct acpi_table_header) + 8
 459             + slit->locality_count * slit->locality_count;
 460         if (slit->header.length != len) {
 461                 printk(KERN_ERR
 462                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 463                        len, slit->header.length);
 464                 return;
 465         }
 466         slit_table = slit;
 467 }
 468
 469 void __init
 470 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 471 {
 472         int pxm;
 473
 474         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 475                 return;
 476
 477         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
 478                 printk_once(KERN_WARNING
 479                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
 480                             ARRAY_SIZE(node_cpuid));
 481                 return;
 482         }
 483         pxm = get_processor_proximity_domain(pa);
 484
 485         /* record this node in proximity bitmap */
 486         pxm_bit_set(pxm);
 487
 488         node_cpuid[srat_num_cpus].phys_id =
 489             (pa->apic_id << 8) | (pa->local_sapic_eid);
 490         /* nid should be overridden as logical node id later */
 491         node_cpuid[srat_num_cpus].nid = pxm;
 492         cpu_set(srat_num_cpus, early_cpu_possible_map);
 493         srat_num_cpus++;
 494 }
 495
 496 int __init
 497 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 498 {
 499         unsigned long paddr, size;
 500         int pxm;
 501         struct node_memblk_s *p, *q, *pend;
 502
 503         pxm = get_memory_proximity_domain(ma);
 504
 505         /* fill node memory chunk structure */
 506         paddr = ma->base_address;
 507         size = ma->length;
 508
 509         /* Ignore disabled entries */
 510         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 511                 return -1;
 512
 513         /* record this node in proximity bitmap */
 514         pxm_bit_set(pxm);
 515
 516         /* Insertion sort based on base address */
 517         pend = &node_memblk[num_node_memblks];
 518         for (p = &node_memblk[0]; p < pend; p++) {
 519                 if (paddr < p->start_paddr)
 520                         break;
 521         }
 522         if (p < pend) {
 523                 for (q = pend - 1; q >= p; q--)
 524                         *(q + 1) = *q;
 525         }
 526         p->start_paddr = paddr;
 527         p->size = size;
 528         p->nid = pxm;
 529         num_node_memblks++;
 530         return 0;
 531 }
 532
 533 void __init acpi_numa_arch_fixup(void)
 534 {
 535         int i, j, node_from, node_to;
 536
 537         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 538         if (srat_num_cpus == 0) {
 539                 node_set_online(0);
 540                 node_cpuid[0].phys_id = hard_smp_processor_id();
 541                 return;
 542         }
 543
 544         /*
 545          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 546          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 547          */
 548         nodes_clear(node_online_map);
 549         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 550                 if (pxm_bit_test(i)) {
 551                         int nid = acpi_map_pxm_to_node(i);
 552                         node_set_online(nid);
 553                 }
 554         }
 555
 556         /* set logical node id in memory chunk structure */
 557         for (i = 0; i < num_node_memblks; i++)
 558                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 559
 560         /* assign memory bank numbers for each chunk on each node */
 561         for_each_online_node(i) {
 562                 int bank;
 563
 564                 bank = 0;
 565                 for (j = 0; j < num_node_memblks; j++)
 566                         if (node_memblk[j].nid == i)
 567                                 node_memblk[j].bank = bank++;
 568         }
 569
 570         /* set logical node id in cpu structure */
 571         for_each_possible_early_cpu(i)
 572                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 573
 574         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 575                num_online_nodes());
 576         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 577                num_node_memblks);
 578
 579         if (!slit_table) {
 580                 for (i = 0; i < MAX_NUMNODES; i++)
 581                         for (j = 0; j < MAX_NUMNODES; j++)
 582                                 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
 583                                                         REMOTE_DISTANCE;
 584                 return;
 585         }
 586
 587         memset(numa_slit, -1, sizeof(numa_slit));
 588         for (i = 0; i < slit_table->locality_count; i++) {
 589                 if (!pxm_bit_test(i))
 590                         continue;
 591                 node_from = pxm_to_node(i);
 592                 for (j = 0; j < slit_table->locality_count; j++) {
 593                         if (!pxm_bit_test(j))
 594                                 continue;
 595                         node_to = pxm_to_node(j);
 596                         node_distance(node_from, node_to) =
 597                             slit_table->entry[i * slit_table->locality_count + j];
 598                 }
 599         }
 600
 601 #ifdef SLIT_DEBUG
 602         printk("ACPI 2.0 SLIT locality table:\n");
 603         for_each_online_node(i) {
 604                 for_each_online_node(j)
 605                     printk("%03d ", node_distance(i, j));
 606                 printk("\n");
 607         }
 608 #endif
 609 }
 610 #endif                          /* CONFIG_ACPI_NUMA */
 611
 612 /*
 613  * success: return IRQ number (>=0)
 614  * failure: return < 0
 615  */
 616 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
 617 {
 618         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 619                 return gsi;
 620
 621         if (has_8259 && gsi < 16)
 622                 return isa_irq_to_vector(gsi);
 623
 624         return iosapic_register_intr(gsi,
 625                                      (polarity ==
 626                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 627                                      IOSAPIC_POL_LOW,
 628                                      (triggering ==
 629                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 630                                      IOSAPIC_LEVEL);
 631 }
 632 EXPORT_SYMBOL_GPL(acpi_register_gsi);
 633
 634 void acpi_unregister_gsi(u32 gsi)
 635 {
 636         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 637                 return;
 638
 639         if (has_8259 && gsi < 16)
 640                 return;
 641
 642         iosapic_unregister_intr(gsi);
 643 }
 644 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
 645
 646 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 647 {
 648         struct acpi_table_header *fadt_header;
 649         struct acpi_table_fadt *fadt;
 650
 651         if (!table)
 652                 return -EINVAL;
 653
 654         fadt_header = (struct acpi_table_header *)table;
 655         if (fadt_header->revision != 3)
 656                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 657
 658         fadt = (struct acpi_table_fadt *)fadt_header;
 659
 660         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
 661                                  ACPI_ACTIVE_LOW);
 662         return 0;
 663 }
 664
 665 int __init early_acpi_boot_init(void)
 666 {
 667         int ret;
 668
 669         /*
 670          * do a partial walk of MADT to determine how many CPUs
 671          * we have including offline CPUs
 672          */
 673         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 674                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 675                 return 0;
 676         }
 677
 678         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 679                 acpi_parse_lsapic, NR_CPUS);
 680         if (ret < 1)
 681                 printk(KERN_ERR PREFIX
 682                        "Error parsing MADT - no LAPIC entries\n");
 683
 684 #ifdef CONFIG_SMP
 685         if (available_cpus == 0) {
 686                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 687                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 688                 smp_boot_data.cpu_phys_id[available_cpus] =
 689                     hard_smp_processor_id();
 690                 available_cpus = 1;     /* We've got at least one of these, no? */
 691         }
 692         smp_boot_data.cpu_count = available_cpus;
 693 #endif
 694         /* Make boot-up look pretty */
 695         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 696                total_cpus);
 697
 698         return 0;
 699 }
 700
 701 int __init acpi_boot_init(void)
 702 {
 703
 704         /*
 705          * MADT
 706          * ----
 707          * Parse the Multiple APIC Description Table (MADT), if exists.
 708          * Note that this table provides platform SMP configuration
 709          * information -- the successor to MPS tables.
 710          */
 711
 712         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 713                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 714                 goto skip_madt;
 715         }
 716
 717         /* Local APIC */
 718
 719         if (acpi_table_parse_madt
 720             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 721                 printk(KERN_ERR PREFIX
 722                        "Error parsing LAPIC address override entry\n");
 723
 724         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 725             < 0)
 726                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 727
 728         /* I/O APIC */
 729
 730         if (acpi_table_parse_madt
 731             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 732                 if (!ia64_platform_is("sn2"))
 733                         printk(KERN_ERR PREFIX
 734                                "Error parsing MADT - no IOSAPIC entries\n");
 735         }
 736
 737         /* System-Level Interrupt Routing */
 738
 739         if (acpi_table_parse_madt
 740             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 741              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 742                 printk(KERN_ERR PREFIX
 743                        "Error parsing platform interrupt source entry\n");
 744
 745         if (acpi_table_parse_madt
 746             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 747                 printk(KERN_ERR PREFIX
 748                        "Error parsing interrupt source overrides entry\n");
 749
 750         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 751                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 752       skip_madt:
 753
 754         /*
 755          * FADT says whether a legacy keyboard controller is present.
 756          * The FADT also contains an SCI_INT line, by which the system
 757          * gets interrupts such as power and sleep buttons.  If it's not
 758          * on a Legacy interrupt, it needs to be setup.
 759          */
 760         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 761                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 762
 763 #ifdef CONFIG_ACPI_NUMA
 764 #ifdef CONFIG_SMP
 765         if (srat_num_cpus == 0) {
 766                 int cpu, i = 1;
 767                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 768                         if (smp_boot_data.cpu_phys_id[cpu] !=
 769                             hard_smp_processor_id())
 770                                 node_cpuid[i++].phys_id =
 771                                     smp_boot_data.cpu_phys_id[cpu];
 772         }
 773 #endif
 774         build_cpu_to_node_map();
 775 #endif
 776         return 0;
 777 }
 778
 779 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 780 {
 781         int tmp;
 782
 783         if (has_8259 && gsi < 16)
 784                 *irq = isa_irq_to_vector(gsi);
 785         else {
 786                 tmp = gsi_to_irq(gsi);
 787                 if (tmp == -1)
 788                         return -1;
 789                 *irq = tmp;
 790         }
 791         return 0;
 792 }
 793
 794 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
 795 {
 796         if (isa_irq >= 16)
 797                 return -1;
 798         *gsi = isa_irq;
 799         return 0;
 800 }
 801
 802 /*
 803  *  ACPI based hotplug CPU support
 804  */
 805 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 806 static
 807 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 808 {
 809 #ifdef CONFIG_ACPI_NUMA
 810         int pxm_id;
 811         int nid;
 812
 813         pxm_id = acpi_get_pxm(handle);
 814         /*
 815          * We don't have cpu-only-node hotadd. But if the system equips
 816          * SRAT table, pxm is already found and node is ready.
 817          * So, just pxm_to_nid(pxm) is OK.
 818          * This code here is for the system which doesn't have full SRAT
 819          * table for possible cpus.
 820          */
 821         nid = acpi_map_pxm_to_node(pxm_id);
 822         node_cpuid[cpu].phys_id = physid;
 823         node_cpuid[cpu].nid = nid;
 824 #endif
 825         return (0);
 826 }
 827
 828 int additional_cpus __initdata = -1;
 829
 830 static __init int setup_additional_cpus(char *s)
 831 {
 832         if (s)
 833                 additional_cpus = simple_strtol(s, NULL, 0);
 834
 835         return 0;
 836 }
 837
 838 early_param("additional_cpus", setup_additional_cpus);
 839
 840 /*
 841  * cpu_possible_mask should be static, it cannot change as CPUs
 842  * are onlined, or offlined. The reason is per-cpu data-structures
 843  * are allocated by some modules at init time, and dont expect to
 844  * do this dynamically on cpu arrival/departure.
 845  * cpu_present_mask on the other hand can change dynamically.
 846  * In case when cpu_hotplug is not compiled, then we resort to current
 847  * behaviour, which is cpu_possible == cpu_present.
 848  * - Ashok Raj
 849  *
 850  * Three ways to find out the number of additional hotplug CPUs:
 851  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 852  * - The user can overwrite it with additional_cpus=NUM
 853  * - Otherwise don't reserve additional CPUs.
 854  */
 855 __init void prefill_possible_map(void)
 856 {
 857         int i;
 858         int possible, disabled_cpus;
 859
 860         disabled_cpus = total_cpus - available_cpus;
 861
 862         if (additional_cpus == -1) {
 863                 if (disabled_cpus > 0)
 864                         additional_cpus = disabled_cpus;
 865                 else
 866                         additional_cpus = 0;
 867         }
 868
 869         possible = available_cpus + additional_cpus;
 870
 871         if (possible > nr_cpu_ids)
 872                 possible = nr_cpu_ids;
 873
 874         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 875                 possible, max((possible - available_cpus), 0));
 876
 877         for (i = 0; i < possible; i++)
 878                 set_cpu_possible(i, true);
 879 }
 880
 881 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
 882 {
 883         cpumask_t tmp_map;
 884         int cpu;
 885
 886         cpumask_complement(&tmp_map, cpu_present_mask);
 887         cpu = cpumask_first(&tmp_map);
 888         if (cpu >= nr_cpu_ids)
 889                 return -EINVAL;
 890
 891         acpi_map_cpu2node(handle, cpu, physid);
 892
 893         set_cpu_present(cpu, true);
 894         ia64_cpu_to_sapicid[cpu] = physid;
 895
 896         acpi_processor_set_pdc(handle);
 897
 898         *pcpu = cpu;
 899         return (0);
 900 }
 901
 902 /* wrapper to silence section mismatch warning */
 903 int __ref acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
 904 {
 905         return _acpi_map_lsapic(handle, physid, pcpu);
 906 }
 907 EXPORT_SYMBOL(acpi_map_lsapic);
 908
 909 int acpi_unmap_lsapic(int cpu)
 910 {
 911         ia64_cpu_to_sapicid[cpu] = -1;
 912         set_cpu_present(cpu, false);
 913
 914 #ifdef CONFIG_ACPI_NUMA
 915         /* NUMA specific cleanup's */
 916 #endif
 917
 918         return (0);
 919 }
 920
 921 EXPORT_SYMBOL(acpi_unmap_lsapic);
 922 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 923
 924 #ifdef CONFIG_ACPI_NUMA
 925 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
 926                                     void *context, void **ret)
 927 {
 928         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 929         union acpi_object *obj;
 930         struct acpi_madt_io_sapic *iosapic;
 931         unsigned int gsi_base;
 932         int pxm, node;
 933
 934         /* Only care about objects w/ a method that returns the MADT */
 935         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 936                 return AE_OK;
 937
 938         if (!buffer.length || !buffer.pointer)
 939                 return AE_OK;
 940
 941         obj = buffer.pointer;
 942         if (obj->type != ACPI_TYPE_BUFFER ||
 943             obj->buffer.length < sizeof(*iosapic)) {
 944                 kfree(buffer.pointer);
 945                 return AE_OK;
 946         }
 947
 948         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 949
 950         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 951                 kfree(buffer.pointer);
 952                 return AE_OK;
 953         }
 954
 955         gsi_base = iosapic->global_irq_base;
 956
 957         kfree(buffer.pointer);
 958
 959         /*
 960          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 961          * us which node to associate this with.
 962          */
 963         pxm = acpi_get_pxm(handle);
 964         if (pxm < 0)
 965                 return AE_OK;
 966
 967         node = pxm_to_node(pxm);
 968
 969         if (node >= MAX_NUMNODES || !node_online(node) ||
 970             cpumask_empty(cpumask_of_node(node)))
 971                 return AE_OK;
 972
 973         /* We know a gsi to node mapping! */
 974         map_iosapic_to_node(gsi_base, node);
 975         return AE_OK;
 976 }
 977
 978 static int __init
 979 acpi_map_iosapics (void)
 980 {
 981         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 982         return 0;
 983 }
 984
 985 fs_initcall(acpi_map_iosapics);
 986 #endif                          /* CONFIG_ACPI_NUMA */
 987
 988 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 989 {
 990         int err;
 991
 992         if ((err = iosapic_init(phys_addr, gsi_base)))
 993                 return err;
 994
 995 #ifdef CONFIG_ACPI_NUMA
 996         acpi_map_iosapic(handle, 0, NULL, NULL);
 997 #endif                          /* CONFIG_ACPI_NUMA */
 998
 999         return 0;
1000 }
1001
1002 EXPORT_SYMBOL(acpi_register_ioapic);
1003
1004 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1005 {
1006         return iosapic_remove(gsi_base);
1007 }
1008
1009 EXPORT_SYMBOL(acpi_unregister_ioapic);
1010
1011 /*
1012  * acpi_suspend_lowlevel() - save kernel state and suspend.
1013  *
1014  * TBD when when IA64 starts to support suspend...
1015  */
1016 int acpi_suspend_lowlevel(void) { return 0; }