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/system.h>
  54 #include <asm/numa.h>
  55 #include <asm/sal.h>
  56 #include <asm/cyclone.h>
  57 #include <asm/xen/hypervisor.h>
  58
  59 #define BAD_MADT_ENTRY(entry, end) (                                        \
  60                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  61                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  62
  63 #define PREFIX                  "ACPI: "
  64
  65 u32 acpi_rsdt_forced;
  66 unsigned int acpi_cpei_override;
  67 unsigned int acpi_cpei_phys_cpuid;
  68
  69 unsigned long acpi_wakeup_address = 0;
  70
  71 #ifdef CONFIG_IA64_GENERIC
  72 static unsigned long __init acpi_find_rsdp(void)
  73 {
  74         unsigned long rsdp_phys = 0;
  75
  76         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  77                 rsdp_phys = efi.acpi20;
  78         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  79                 printk(KERN_WARNING PREFIX
  80                        "v1.0/r0.71 tables no longer supported\n");
  81         return rsdp_phys;
  82 }
  83
  84 const char __init *
  85 acpi_get_sysname(void)
  86 {
  87         unsigned long rsdp_phys;
  88         struct acpi_table_rsdp *rsdp;
  89         struct acpi_table_xsdt *xsdt;
  90         struct acpi_table_header *hdr;
  91 #ifdef CONFIG_INTEL_IOMMU
  92         u64 i, nentries;
  93 #endif
  94
  95         rsdp_phys = acpi_find_rsdp();
  96         if (!rsdp_phys) {
  97                 printk(KERN_ERR
  98                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  99                 return "dig";
 100         }
 101
 102         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
 103         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
 104                 printk(KERN_ERR
 105                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 106                 return "dig";
 107         }
 108
 109         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 110         hdr = &xsdt->header;
 111         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 112                 printk(KERN_ERR
 113                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 114                 return "dig";
 115         }
 116
 117         if (!strcmp(hdr->oem_id, "HP")) {
 118                 return "hpzx1";
 119         } else if (!strcmp(hdr->oem_id, "SGI")) {
 120                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
 121                         return "uv";
 122                 else
 123                         return "sn2";
 124         } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
 125                 return "xen";
 126         }
 127
 128 #ifdef CONFIG_INTEL_IOMMU
 129         /* Look for Intel IOMMU */
 130         nentries = (hdr->length - sizeof(*hdr)) /
 131                          sizeof(xsdt->table_offset_entry[0]);
 132         for (i = 0; i < nentries; i++) {
 133                 hdr = __va(xsdt->table_offset_entry[i]);
 134                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
 135                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
 136                         return "dig_vtd";
 137         }
 138 #endif
 139
 140         return "dig";
 141 }
 142 #endif /* CONFIG_IA64_GENERIC */
 143
 144 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 145
 146 /* Array to record platform interrupt vectors for generic interrupt routing. */
 147 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 148         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 149 };
 150
 151 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 152
 153 /*
 154  * Interrupt routing API for device drivers.  Provides interrupt vector for
 155  * a generic platform event.  Currently only CPEI is implemented.
 156  */
 157 int acpi_request_vector(u32 int_type)
 158 {
 159         int vector = -1;
 160
 161         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 162                 /* corrected platform error interrupt */
 163                 vector = platform_intr_list[int_type];
 164         } else
 165                 printk(KERN_ERR
 166                        "acpi_request_vector(): invalid interrupt type\n");
 167         return vector;
 168 }
 169
 170 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 171 {
 172         return __va(phys_addr);
 173 }
 174
 175 void __init __acpi_unmap_table(char *map, unsigned long size)
 176 {
 177 }
 178
 179 /* --------------------------------------------------------------------------
 180                             Boot-time Table Parsing
 181    -------------------------------------------------------------------------- */
 182
 183 static int available_cpus __initdata;
 184 struct acpi_table_madt *acpi_madt __initdata;
 185 static u8 has_8259;
 186
 187 static int __init
 188 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 189                           const unsigned long end)
 190 {
 191         struct acpi_madt_local_apic_override *lapic;
 192
 193         lapic = (struct acpi_madt_local_apic_override *)header;
 194
 195         if (BAD_MADT_ENTRY(lapic, end))
 196                 return -EINVAL;
 197
 198         if (lapic->address) {
 199                 iounmap(ipi_base_addr);
 200                 ipi_base_addr = ioremap(lapic->address, 0);
 201         }
 202         return 0;
 203 }
 204
 205 static int __init
 206 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 207 {
 208         struct acpi_madt_local_sapic *lsapic;
 209
 210         lsapic = (struct acpi_madt_local_sapic *)header;
 211
 212         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 213
 214         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 215 #ifdef CONFIG_SMP
 216                 smp_boot_data.cpu_phys_id[available_cpus] =
 217                     (lsapic->id << 8) | lsapic->eid;
 218 #endif
 219                 ++available_cpus;
 220         }
 221
 222         total_cpus++;
 223         return 0;
 224 }
 225
 226 static int __init
 227 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 228 {
 229         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 230
 231         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 232
 233         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 234                 return -EINVAL;
 235
 236         /* TBD: Support lapic_nmi entries */
 237         return 0;
 238 }
 239
 240 static int __init
 241 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 242 {
 243         struct acpi_madt_io_sapic *iosapic;
 244
 245         iosapic = (struct acpi_madt_io_sapic *)header;
 246
 247         if (BAD_MADT_ENTRY(iosapic, end))
 248                 return -EINVAL;
 249
 250         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 251 }
 252
 253 static unsigned int __initdata acpi_madt_rev;
 254
 255 static int __init
 256 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 257                         const unsigned long end)
 258 {
 259         struct acpi_madt_interrupt_source *plintsrc;
 260         int vector;
 261
 262         plintsrc = (struct acpi_madt_interrupt_source *)header;
 263
 264         if (BAD_MADT_ENTRY(plintsrc, end))
 265                 return -EINVAL;
 266
 267         /*
 268          * Get vector assignment for this interrupt, set attributes,
 269          * and program the IOSAPIC routing table.
 270          */
 271         vector = iosapic_register_platform_intr(plintsrc->type,
 272                                                 plintsrc->global_irq,
 273                                                 plintsrc->io_sapic_vector,
 274                                                 plintsrc->eid,
 275                                                 plintsrc->id,
 276                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 277                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 278                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 279                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 280                                                  ACPI_MADT_TRIGGER_EDGE) ?
 281                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 282
 283         platform_intr_list[plintsrc->type] = vector;
 284         if (acpi_madt_rev > 1) {
 285                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 286         }
 287
 288         /*
 289          * Save the physical id, so we can check when its being removed
 290          */
 291         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 292
 293         return 0;
 294 }
 295
 296 #ifdef CONFIG_HOTPLUG_CPU
 297 unsigned int can_cpei_retarget(void)
 298 {
 299         extern int cpe_vector;
 300         extern unsigned int force_cpei_retarget;
 301
 302         /*
 303          * Only if CPEI is supported and the override flag
 304          * is present, otherwise return that its re-targettable
 305          * if we are in polling mode.
 306          */
 307         if (cpe_vector > 0) {
 308                 if (acpi_cpei_override || force_cpei_retarget)
 309                         return 1;
 310                 else
 311                         return 0;
 312         }
 313         return 1;
 314 }
 315
 316 unsigned int is_cpu_cpei_target(unsigned int cpu)
 317 {
 318         unsigned int logical_id;
 319
 320         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 321
 322         if (logical_id == cpu)
 323                 return 1;
 324         else
 325                 return 0;
 326 }
 327
 328 void set_cpei_target_cpu(unsigned int cpu)
 329 {
 330         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 331 }
 332 #endif
 333
 334 unsigned int get_cpei_target_cpu(void)
 335 {
 336         return acpi_cpei_phys_cpuid;
 337 }
 338
 339 static int __init
 340 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 341                        const unsigned long end)
 342 {
 343         struct acpi_madt_interrupt_override *p;
 344
 345         p = (struct acpi_madt_interrupt_override *)header;
 346
 347         if (BAD_MADT_ENTRY(p, end))
 348                 return -EINVAL;
 349
 350         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 351                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 352                                   ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 353                                  IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 354                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 355                                  ACPI_MADT_TRIGGER_EDGE) ?
 356                                  IOSAPIC_EDGE : IOSAPIC_LEVEL);
 357         return 0;
 358 }
 359
 360 static int __init
 361 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 362 {
 363         struct acpi_madt_nmi_source *nmi_src;
 364
 365         nmi_src = (struct acpi_madt_nmi_source *)header;
 366
 367         if (BAD_MADT_ENTRY(nmi_src, end))
 368                 return -EINVAL;
 369
 370         /* TBD: Support nimsrc entries */
 371         return 0;
 372 }
 373
 374 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 375 {
 376         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 377
 378                 /*
 379                  * Unfortunately ITC_DRIFT is not yet part of the
 380                  * official SAL spec, so the ITC_DRIFT bit is not
 381                  * set by the BIOS on this hardware.
 382                  */
 383                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 384
 385                 cyclone_setup();
 386         }
 387 }
 388
 389 static int __init acpi_parse_madt(struct acpi_table_header *table)
 390 {
 391         if (!table)
 392                 return -EINVAL;
 393
 394         acpi_madt = (struct acpi_table_madt *)table;
 395
 396         acpi_madt_rev = acpi_madt->header.revision;
 397
 398         /* remember the value for reference after free_initmem() */
 399 #ifdef CONFIG_ITANIUM
 400         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 401 #else
 402         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 403 #endif
 404         iosapic_system_init(has_8259);
 405
 406         /* Get base address of IPI Message Block */
 407
 408         if (acpi_madt->address)
 409                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 410
 411         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 412
 413         acpi_madt_oem_check(acpi_madt->header.oem_id,
 414                             acpi_madt->header.oem_table_id);
 415
 416         return 0;
 417 }
 418
 419 #ifdef CONFIG_ACPI_NUMA
 420
 421 #undef SLIT_DEBUG
 422
 423 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 424
 425 static int __initdata srat_num_cpus;    /* number of cpus */
 426 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 427 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 428 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 429 static struct acpi_table_slit __initdata *slit_table;
 430 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 431
 432 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 433 {
 434         int pxm;
 435
 436         pxm = pa->proximity_domain_lo;
 437         if (ia64_platform_is("sn2"))
 438                 pxm += pa->proximity_domain_hi[0] << 8;
 439         return pxm;
 440 }
 441
 442 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 443 {
 444         int pxm;
 445
 446         pxm = ma->proximity_domain;
 447         if (!ia64_platform_is("sn2"))
 448                 pxm &= 0xff;
 449
 450         return pxm;
 451 }
 452
 453 /*
 454  * ACPI 2.0 SLIT (System Locality Information Table)
 455  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 456  */
 457 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 458 {
 459         u32 len;
 460
 461         len = sizeof(struct acpi_table_header) + 8
 462             + slit->locality_count * slit->locality_count;
 463         if (slit->header.length != len) {
 464                 printk(KERN_ERR
 465                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 466                        len, slit->header.length);
 467                 return;
 468         }
 469         slit_table = slit;
 470 }
 471
 472 void __init
 473 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 474 {
 475         int pxm;
 476
 477         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 478                 return;
 479
 480         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
 481                 printk_once(KERN_WARNING
 482                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
 483                             ARRAY_SIZE(node_cpuid));
 484                 return;
 485         }
 486         pxm = get_processor_proximity_domain(pa);
 487
 488         /* record this node in proximity bitmap */
 489         pxm_bit_set(pxm);
 490
 491         node_cpuid[srat_num_cpus].phys_id =
 492             (pa->apic_id << 8) | (pa->local_sapic_eid);
 493         /* nid should be overridden as logical node id later */
 494         node_cpuid[srat_num_cpus].nid = pxm;
 495         cpu_set(srat_num_cpus, early_cpu_possible_map);
 496         srat_num_cpus++;
 497 }
 498
 499 void __init
 500 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 501 {
 502         unsigned long paddr, size;
 503         int pxm;
 504         struct node_memblk_s *p, *q, *pend;
 505
 506         pxm = get_memory_proximity_domain(ma);
 507
 508         /* fill node memory chunk structure */
 509         paddr = ma->base_address;
 510         size = ma->length;
 511
 512         /* Ignore disabled entries */
 513         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 514                 return;
 515
 516         /* record this node in proximity bitmap */
 517         pxm_bit_set(pxm);
 518
 519         /* Insertion sort based on base address */
 520         pend = &node_memblk[num_node_memblks];
 521         for (p = &node_memblk[0]; p < pend; p++) {
 522                 if (paddr < p->start_paddr)
 523                         break;
 524         }
 525         if (p < pend) {
 526                 for (q = pend - 1; q >= p; q--)
 527                         *(q + 1) = *q;
 528         }
 529         p->start_paddr = paddr;
 530         p->size = size;
 531         p->nid = pxm;
 532         num_node_memblks++;
 533 }
 534
 535 void __init acpi_numa_arch_fixup(void)
 536 {
 537         int i, j, node_from, node_to;
 538
 539         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 540         if (srat_num_cpus == 0) {
 541                 node_set_online(0);
 542                 node_cpuid[0].phys_id = hard_smp_processor_id();
 543                 return;
 544         }
 545
 546         /*
 547          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 548          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 549          */
 550         nodes_clear(node_online_map);
 551         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 552                 if (pxm_bit_test(i)) {
 553                         int nid = acpi_map_pxm_to_node(i);
 554                         node_set_online(nid);
 555                 }
 556         }
 557
 558         /* set logical node id in memory chunk structure */
 559         for (i = 0; i < num_node_memblks; i++)
 560                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 561
 562         /* assign memory bank numbers for each chunk on each node */
 563         for_each_online_node(i) {
 564                 int bank;
 565
 566                 bank = 0;
 567                 for (j = 0; j < num_node_memblks; j++)
 568                         if (node_memblk[j].nid == i)
 569                                 node_memblk[j].bank = bank++;
 570         }
 571
 572         /* set logical node id in cpu structure */
 573         for_each_possible_early_cpu(i)
 574                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 575
 576         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 577                num_online_nodes());
 578         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 579                num_node_memblks);
 580
 581         if (!slit_table) {
 582                 for (i = 0; i < MAX_NUMNODES; i++)
 583                         for (j = 0; j < MAX_NUMNODES; j++)
 584                                 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
 585                                                         REMOTE_DISTANCE;
 586                 return;
 587         }
 588
 589         memset(numa_slit, -1, sizeof(numa_slit));
 590         for (i = 0; i < slit_table->locality_count; i++) {
 591                 if (!pxm_bit_test(i))
 592                         continue;
 593                 node_from = pxm_to_node(i);
 594                 for (j = 0; j < slit_table->locality_count; j++) {
 595                         if (!pxm_bit_test(j))
 596                                 continue;
 597                         node_to = pxm_to_node(j);
 598                         node_distance(node_from, node_to) =
 599                             slit_table->entry[i * slit_table->locality_count + j];
 600                 }
 601         }
 602
 603 #ifdef SLIT_DEBUG
 604         printk("ACPI 2.0 SLIT locality table:\n");
 605         for_each_online_node(i) {
 606                 for_each_online_node(j)
 607                     printk("%03d ", node_distance(i, j));
 608                 printk("\n");
 609         }
 610 #endif
 611 }
 612 #endif                          /* CONFIG_ACPI_NUMA */
 613
 614 /*
 615  * success: return IRQ number (>=0)
 616  * failure: return < 0
 617  */
 618 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
 619 {
 620         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 621                 return gsi;
 622
 623         if (has_8259 && gsi < 16)
 624                 return isa_irq_to_vector(gsi);
 625
 626         return iosapic_register_intr(gsi,
 627                                      (polarity ==
 628                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 629                                      IOSAPIC_POL_LOW,
 630                                      (triggering ==
 631                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 632                                      IOSAPIC_LEVEL);
 633 }
 634
 635 void acpi_unregister_gsi(u32 gsi)
 636 {
 637         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 638                 return;
 639
 640         if (has_8259 && gsi < 16)
 641                 return;
 642
 643         iosapic_unregister_intr(gsi);
 644 }
 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 __cpuinit
 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_map 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_map 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 __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
 882 {
 883         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 884         union acpi_object *obj;
 885         struct acpi_madt_local_sapic *lsapic;
 886         cpumask_t tmp_map;
 887         int cpu, physid;
 888
 889         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 890                 return -EINVAL;
 891
 892         if (!buffer.length || !buffer.pointer)
 893                 return -EINVAL;
 894
 895         obj = buffer.pointer;
 896         if (obj->type != ACPI_TYPE_BUFFER)
 897         {
 898                 kfree(buffer.pointer);
 899                 return -EINVAL;
 900         }
 901
 902         lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
 903
 904         if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
 905             (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
 906                 kfree(buffer.pointer);
 907                 return -EINVAL;
 908         }
 909
 910         physid = ((lsapic->id << 8) | (lsapic->eid));
 911
 912         kfree(buffer.pointer);
 913         buffer.length = ACPI_ALLOCATE_BUFFER;
 914         buffer.pointer = NULL;
 915
 916         cpumask_complement(&tmp_map, cpu_present_mask);
 917         cpu = cpumask_first(&tmp_map);
 918         if (cpu >= nr_cpu_ids)
 919                 return -EINVAL;
 920
 921         acpi_map_cpu2node(handle, cpu, physid);
 922
 923         cpu_set(cpu, cpu_present_map);
 924         ia64_cpu_to_sapicid[cpu] = physid;
 925
 926         acpi_processor_set_pdc(handle);
 927
 928         *pcpu = cpu;
 929         return (0);
 930 }
 931
 932 /* wrapper to silence section mismatch warning */
 933 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
 934 {
 935         return _acpi_map_lsapic(handle, pcpu);
 936 }
 937 EXPORT_SYMBOL(acpi_map_lsapic);
 938
 939 int acpi_unmap_lsapic(int cpu)
 940 {
 941         ia64_cpu_to_sapicid[cpu] = -1;
 942         cpu_clear(cpu, cpu_present_map);
 943
 944 #ifdef CONFIG_ACPI_NUMA
 945         /* NUMA specific cleanup's */
 946 #endif
 947
 948         return (0);
 949 }
 950
 951 EXPORT_SYMBOL(acpi_unmap_lsapic);
 952 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 953
 954 #ifdef CONFIG_ACPI_NUMA
 955 static acpi_status __devinit
 956 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
 957 {
 958         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 959         union acpi_object *obj;
 960         struct acpi_madt_io_sapic *iosapic;
 961         unsigned int gsi_base;
 962         int pxm, node;
 963
 964         /* Only care about objects w/ a method that returns the MADT */
 965         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 966                 return AE_OK;
 967
 968         if (!buffer.length || !buffer.pointer)
 969                 return AE_OK;
 970
 971         obj = buffer.pointer;
 972         if (obj->type != ACPI_TYPE_BUFFER ||
 973             obj->buffer.length < sizeof(*iosapic)) {
 974                 kfree(buffer.pointer);
 975                 return AE_OK;
 976         }
 977
 978         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 979
 980         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 981                 kfree(buffer.pointer);
 982                 return AE_OK;
 983         }
 984
 985         gsi_base = iosapic->global_irq_base;
 986
 987         kfree(buffer.pointer);
 988
 989         /*
 990          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 991          * us which node to associate this with.
 992          */
 993         pxm = acpi_get_pxm(handle);
 994         if (pxm < 0)
 995                 return AE_OK;
 996
 997         node = pxm_to_node(pxm);
 998
 999         if (node >= MAX_NUMNODES || !node_online(node) ||
1000             cpumask_empty(cpumask_of_node(node)))
1001                 return AE_OK;
1002
1003         /* We know a gsi to node mapping! */
1004         map_iosapic_to_node(gsi_base, node);
1005         return AE_OK;
1006 }
1007
1008 static int __init
1009 acpi_map_iosapics (void)
1010 {
1011         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
1012         return 0;
1013 }
1014
1015 fs_initcall(acpi_map_iosapics);
1016 #endif                          /* CONFIG_ACPI_NUMA */
1017
1018 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
1019 {
1020         int err;
1021
1022         if ((err = iosapic_init(phys_addr, gsi_base)))
1023                 return err;
1024
1025 #ifdef CONFIG_ACPI_NUMA
1026         acpi_map_iosapic(handle, 0, NULL, NULL);
1027 #endif                          /* CONFIG_ACPI_NUMA */
1028
1029         return 0;
1030 }
1031
1032 EXPORT_SYMBOL(acpi_register_ioapic);
1033
1034 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1035 {
1036         return iosapic_remove(gsi_base);
1037 }
1038
1039 EXPORT_SYMBOL(acpi_unregister_ioapic);
1040
1041 /*
1042  * acpi_suspend_lowlevel() - save kernel state and suspend.
1043  *
1044  * TBD when when IA64 starts to support suspend...
1045  */
1046 int acpi_suspend_lowlevel(void) { return 0; }