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 #include <asm/xen/hypervisor.h>
  57
  58 #define BAD_MADT_ENTRY(entry, end) (                                        \
  59                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
  60                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
  61
  62 #define PREFIX                  "ACPI: "
  63
  64 u32 acpi_rsdt_forced;
  65 unsigned int acpi_cpei_override;
  66 unsigned int acpi_cpei_phys_cpuid;
  67
  68 unsigned long acpi_wakeup_address = 0;
  69
  70 #ifdef CONFIG_IA64_GENERIC
  71 static unsigned long __init acpi_find_rsdp(void)
  72 {
  73         unsigned long rsdp_phys = 0;
  74
  75         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  76                 rsdp_phys = efi.acpi20;
  77         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  78                 printk(KERN_WARNING PREFIX
  79                        "v1.0/r0.71 tables no longer supported\n");
  80         return rsdp_phys;
  81 }
  82
  83 const char __init *
  84 acpi_get_sysname(void)
  85 {
  86         unsigned long rsdp_phys;
  87         struct acpi_table_rsdp *rsdp;
  88         struct acpi_table_xsdt *xsdt;
  89         struct acpi_table_header *hdr;
  90 #ifdef CONFIG_INTEL_IOMMU
  91         u64 i, nentries;
  92 #endif
  93
  94         rsdp_phys = acpi_find_rsdp();
  95         if (!rsdp_phys) {
  96                 printk(KERN_ERR
  97                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  98                 return "dig";
  99         }
 100
 101         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
 102         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
 103                 printk(KERN_ERR
 104                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 105                 return "dig";
 106         }
 107
 108         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 109         hdr = &xsdt->header;
 110         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 111                 printk(KERN_ERR
 112                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 113                 return "dig";
 114         }
 115
 116         if (!strcmp(hdr->oem_id, "HP")) {
 117                 return "hpzx1";
 118         } else if (!strcmp(hdr->oem_id, "SGI")) {
 119                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
 120                         return "uv";
 121                 else
 122                         return "sn2";
 123         } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
 124                 return "xen";
 125         }
 126
 127 #ifdef CONFIG_INTEL_IOMMU
 128         /* Look for Intel IOMMU */
 129         nentries = (hdr->length - sizeof(*hdr)) /
 130                          sizeof(xsdt->table_offset_entry[0]);
 131         for (i = 0; i < nentries; i++) {
 132                 hdr = __va(xsdt->table_offset_entry[i]);
 133                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
 134                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
 135                         return "dig_vtd";
 136         }
 137 #endif
 138
 139         return "dig";
 140 }
 141 #endif /* CONFIG_IA64_GENERIC */
 142
 143 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 144
 145 /* Array to record platform interrupt vectors for generic interrupt routing. */
 146 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 147         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 148 };
 149
 150 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 151
 152 /*
 153  * Interrupt routing API for device drivers.  Provides interrupt vector for
 154  * a generic platform event.  Currently only CPEI is implemented.
 155  */
 156 int acpi_request_vector(u32 int_type)
 157 {
 158         int vector = -1;
 159
 160         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 161                 /* corrected platform error interrupt */
 162                 vector = platform_intr_list[int_type];
 163         } else
 164                 printk(KERN_ERR
 165                        "acpi_request_vector(): invalid interrupt type\n");
 166         return vector;
 167 }
 168
 169 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 170 {
 171         return __va(phys_addr);
 172 }
 173
 174 void __init __acpi_unmap_table(char *map, unsigned long size)
 175 {
 176 }
 177
 178 /* --------------------------------------------------------------------------
 179                             Boot-time Table Parsing
 180    -------------------------------------------------------------------------- */
 181
 182 static int available_cpus __initdata;
 183 struct acpi_table_madt *acpi_madt __initdata;
 184 static u8 has_8259;
 185
 186 static int __init
 187 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 188                           const unsigned long end)
 189 {
 190         struct acpi_madt_local_apic_override *lapic;
 191
 192         lapic = (struct acpi_madt_local_apic_override *)header;
 193
 194         if (BAD_MADT_ENTRY(lapic, end))
 195                 return -EINVAL;
 196
 197         if (lapic->address) {
 198                 iounmap(ipi_base_addr);
 199                 ipi_base_addr = ioremap(lapic->address, 0);
 200         }
 201         return 0;
 202 }
 203
 204 static int __init
 205 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 206 {
 207         struct acpi_madt_local_sapic *lsapic;
 208
 209         lsapic = (struct acpi_madt_local_sapic *)header;
 210
 211         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 212
 213         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 214 #ifdef CONFIG_SMP
 215                 smp_boot_data.cpu_phys_id[available_cpus] =
 216                     (lsapic->id << 8) | lsapic->eid;
 217 #endif
 218                 ++available_cpus;
 219         }
 220
 221         total_cpus++;
 222         return 0;
 223 }
 224
 225 static int __init
 226 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 227 {
 228         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 229
 230         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 231
 232         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 233                 return -EINVAL;
 234
 235         /* TBD: Support lapic_nmi entries */
 236         return 0;
 237 }
 238
 239 static int __init
 240 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 241 {
 242         struct acpi_madt_io_sapic *iosapic;
 243
 244         iosapic = (struct acpi_madt_io_sapic *)header;
 245
 246         if (BAD_MADT_ENTRY(iosapic, end))
 247                 return -EINVAL;
 248
 249         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 250 }
 251
 252 static unsigned int __initdata acpi_madt_rev;
 253
 254 static int __init
 255 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 256                         const unsigned long end)
 257 {
 258         struct acpi_madt_interrupt_source *plintsrc;
 259         int vector;
 260
 261         plintsrc = (struct acpi_madt_interrupt_source *)header;
 262
 263         if (BAD_MADT_ENTRY(plintsrc, end))
 264                 return -EINVAL;
 265
 266         /*
 267          * Get vector assignment for this interrupt, set attributes,
 268          * and program the IOSAPIC routing table.
 269          */
 270         vector = iosapic_register_platform_intr(plintsrc->type,
 271                                                 plintsrc->global_irq,
 272                                                 plintsrc->io_sapic_vector,
 273                                                 plintsrc->eid,
 274                                                 plintsrc->id,
 275                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 276                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 277                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 278                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 279                                                  ACPI_MADT_TRIGGER_EDGE) ?
 280                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 281
 282         platform_intr_list[plintsrc->type] = vector;
 283         if (acpi_madt_rev > 1) {
 284                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 285         }
 286
 287         /*
 288          * Save the physical id, so we can check when its being removed
 289          */
 290         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 291
 292         return 0;
 293 }
 294
 295 #ifdef CONFIG_HOTPLUG_CPU
 296 unsigned int can_cpei_retarget(void)
 297 {
 298         extern int cpe_vector;
 299         extern unsigned int force_cpei_retarget;
 300
 301         /*
 302          * Only if CPEI is supported and the override flag
 303          * is present, otherwise return that its re-targettable
 304          * if we are in polling mode.
 305          */
 306         if (cpe_vector > 0) {
 307                 if (acpi_cpei_override || force_cpei_retarget)
 308                         return 1;
 309                 else
 310                         return 0;
 311         }
 312         return 1;
 313 }
 314
 315 unsigned int is_cpu_cpei_target(unsigned int cpu)
 316 {
 317         unsigned int logical_id;
 318
 319         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 320
 321         if (logical_id == cpu)
 322                 return 1;
 323         else
 324                 return 0;
 325 }
 326
 327 void set_cpei_target_cpu(unsigned int cpu)
 328 {
 329         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 330 }
 331 #endif
 332
 333 unsigned int get_cpei_target_cpu(void)
 334 {
 335         return acpi_cpei_phys_cpuid;
 336 }
 337
 338 static int __init
 339 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 340                        const unsigned long end)
 341 {
 342         struct acpi_madt_interrupt_override *p;
 343
 344         p = (struct acpi_madt_interrupt_override *)header;
 345
 346         if (BAD_MADT_ENTRY(p, end))
 347                 return -EINVAL;
 348
 349         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 350                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 351                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
 352                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
 353                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 354                                  ACPI_MADT_TRIGGER_LEVEL) ?
 355                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
 356         return 0;
 357 }
 358
 359 static int __init
 360 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 361 {
 362         struct acpi_madt_nmi_source *nmi_src;
 363
 364         nmi_src = (struct acpi_madt_nmi_source *)header;
 365
 366         if (BAD_MADT_ENTRY(nmi_src, end))
 367                 return -EINVAL;
 368
 369         /* TBD: Support nimsrc entries */
 370         return 0;
 371 }
 372
 373 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 374 {
 375         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 376
 377                 /*
 378                  * Unfortunately ITC_DRIFT is not yet part of the
 379                  * official SAL spec, so the ITC_DRIFT bit is not
 380                  * set by the BIOS on this hardware.
 381                  */
 382                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 383
 384                 cyclone_setup();
 385         }
 386 }
 387
 388 static int __init acpi_parse_madt(struct acpi_table_header *table)
 389 {
 390         if (!table)
 391                 return -EINVAL;
 392
 393         acpi_madt = (struct acpi_table_madt *)table;
 394
 395         acpi_madt_rev = acpi_madt->header.revision;
 396
 397         /* remember the value for reference after free_initmem() */
 398 #ifdef CONFIG_ITANIUM
 399         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 400 #else
 401         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 402 #endif
 403         iosapic_system_init(has_8259);
 404
 405         /* Get base address of IPI Message Block */
 406
 407         if (acpi_madt->address)
 408                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 409
 410         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 411
 412         acpi_madt_oem_check(acpi_madt->header.oem_id,
 413                             acpi_madt->header.oem_table_id);
 414
 415         return 0;
 416 }
 417
 418 #ifdef CONFIG_ACPI_NUMA
 419
 420 #undef SLIT_DEBUG
 421
 422 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 423
 424 static int __initdata srat_num_cpus;    /* number of cpus */
 425 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
 426 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 427 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 428 static struct acpi_table_slit __initdata *slit_table;
 429 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 430
 431 static int __init
 432 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") || acpi_srat_revision >= 2)
 438                 pxm += pa->proximity_domain_hi[0] << 8;
 439         return pxm;
 440 }
 441
 442 static int __init
 443 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 444 {
 445         int pxm;
 446
 447         pxm = ma->proximity_domain;
 448         if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
 449                 pxm &= 0xff;
 450
 451         return pxm;
 452 }
 453
 454 /*
 455  * ACPI 2.0 SLIT (System Locality Information Table)
 456  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 457  */
 458 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 459 {
 460         u32 len;
 461
 462         len = sizeof(struct acpi_table_header) + 8
 463             + slit->locality_count * slit->locality_count;
 464         if (slit->header.length != len) {
 465                 printk(KERN_ERR
 466                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 467                        len, slit->header.length);
 468                 return;
 469         }
 470         slit_table = slit;
 471 }
 472
 473 void __init
 474 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 475 {
 476         int pxm;
 477
 478         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 479                 return;
 480
 481         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
 482                 printk_once(KERN_WARNING
 483                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
 484                             ARRAY_SIZE(node_cpuid));
 485                 return;
 486         }
 487         pxm = get_processor_proximity_domain(pa);
 488
 489         /* record this node in proximity bitmap */
 490         pxm_bit_set(pxm);
 491
 492         node_cpuid[srat_num_cpus].phys_id =
 493             (pa->apic_id << 8) | (pa->local_sapic_eid);
 494         /* nid should be overridden as logical node id later */
 495         node_cpuid[srat_num_cpus].nid = pxm;
 496         cpu_set(srat_num_cpus, early_cpu_possible_map);
 497         srat_num_cpus++;
 498 }
 499
 500 void __init
 501 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 502 {
 503         unsigned long paddr, size;
 504         int pxm;
 505         struct node_memblk_s *p, *q, *pend;
 506
 507         pxm = get_memory_proximity_domain(ma);
 508
 509         /* fill node memory chunk structure */
 510         paddr = ma->base_address;
 511         size = ma->length;
 512
 513         /* Ignore disabled entries */
 514         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 515                 return;
 516
 517         /* record this node in proximity bitmap */
 518         pxm_bit_set(pxm);
 519
 520         /* Insertion sort based on base address */
 521         pend = &node_memblk[num_node_memblks];
 522         for (p = &node_memblk[0]; p < pend; p++) {
 523                 if (paddr < p->start_paddr)
 524                         break;
 525         }
 526         if (p < pend) {
 527                 for (q = pend - 1; q >= p; q--)
 528                         *(q + 1) = *q;
 529         }
 530         p->start_paddr = paddr;
 531         p->size = size;
 532         p->nid = pxm;
 533         num_node_memblks++;
 534 }
 535
 536 void __init acpi_numa_arch_fixup(void)
 537 {
 538         int i, j, node_from, node_to;
 539
 540         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 541         if (srat_num_cpus == 0) {
 542                 node_set_online(0);
 543                 node_cpuid[0].phys_id = hard_smp_processor_id();
 544                 return;
 545         }
 546
 547         /*
 548          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 549          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 550          */
 551         nodes_clear(node_online_map);
 552         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 553                 if (pxm_bit_test(i)) {
 554                         int nid = acpi_map_pxm_to_node(i);
 555                         node_set_online(nid);
 556                 }
 557         }
 558
 559         /* set logical node id in memory chunk structure */
 560         for (i = 0; i < num_node_memblks; i++)
 561                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 562
 563         /* assign memory bank numbers for each chunk on each node */
 564         for_each_online_node(i) {
 565                 int bank;
 566
 567                 bank = 0;
 568                 for (j = 0; j < num_node_memblks; j++)
 569                         if (node_memblk[j].nid == i)
 570                                 node_memblk[j].bank = bank++;
 571         }
 572
 573         /* set logical node id in cpu structure */
 574         for_each_possible_early_cpu(i)
 575                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 576
 577         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 578                num_online_nodes());
 579         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 580                num_node_memblks);
 581
 582         if (!slit_table) {
 583                 for (i = 0; i < MAX_NUMNODES; i++)
 584                         for (j = 0; j < MAX_NUMNODES; j++)
 585                                 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
 586                                                         REMOTE_DISTANCE;
 587                 return;
 588         }
 589
 590         memset(numa_slit, -1, sizeof(numa_slit));
 591         for (i = 0; i < slit_table->locality_count; i++) {
 592                 if (!pxm_bit_test(i))
 593                         continue;
 594                 node_from = pxm_to_node(i);
 595                 for (j = 0; j < slit_table->locality_count; j++) {
 596                         if (!pxm_bit_test(j))
 597                                 continue;
 598                         node_to = pxm_to_node(j);
 599                         node_distance(node_from, node_to) =
 600                             slit_table->entry[i * slit_table->locality_count + j];
 601                 }
 602         }
 603
 604 #ifdef SLIT_DEBUG
 605         printk("ACPI 2.0 SLIT locality table:\n");
 606         for_each_online_node(i) {
 607                 for_each_online_node(j)
 608                     printk("%03d ", node_distance(i, j));
 609                 printk("\n");
 610         }
 611 #endif
 612 }
 613 #endif                          /* CONFIG_ACPI_NUMA */
 614
 615 /*
 616  * success: return IRQ number (>=0)
 617  * failure: return < 0
 618  */
 619 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
 620 {
 621         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 622                 return gsi;
 623
 624         if (has_8259 && gsi < 16)
 625                 return isa_irq_to_vector(gsi);
 626
 627         return iosapic_register_intr(gsi,
 628                                      (polarity ==
 629                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 630                                      IOSAPIC_POL_LOW,
 631                                      (triggering ==
 632                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 633                                      IOSAPIC_LEVEL);
 634 }
 635
 636 void acpi_unregister_gsi(u32 gsi)
 637 {
 638         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 639                 return;
 640
 641         if (has_8259 && gsi < 16)
 642                 return;
 643
 644         iosapic_unregister_intr(gsi);
 645 }
 646
 647 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 648 {
 649         struct acpi_table_header *fadt_header;
 650         struct acpi_table_fadt *fadt;
 651
 652         if (!table)
 653                 return -EINVAL;
 654
 655         fadt_header = (struct acpi_table_header *)table;
 656         if (fadt_header->revision != 3)
 657                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 658
 659         fadt = (struct acpi_table_fadt *)fadt_header;
 660
 661         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
 662                                  ACPI_ACTIVE_LOW);
 663         return 0;
 664 }
 665
 666 int __init early_acpi_boot_init(void)
 667 {
 668         int ret;
 669
 670         /*
 671          * do a partial walk of MADT to determine how many CPUs
 672          * we have including offline CPUs
 673          */
 674         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 675                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 676                 return 0;
 677         }
 678
 679         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 680                 acpi_parse_lsapic, NR_CPUS);
 681         if (ret < 1)
 682                 printk(KERN_ERR PREFIX
 683                        "Error parsing MADT - no LAPIC entries\n");
 684
 685 #ifdef CONFIG_SMP
 686         if (available_cpus == 0) {
 687                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 688                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 689                 smp_boot_data.cpu_phys_id[available_cpus] =
 690                     hard_smp_processor_id();
 691                 available_cpus = 1;     /* We've got at least one of these, no? */
 692         }
 693         smp_boot_data.cpu_count = available_cpus;
 694 #endif
 695         /* Make boot-up look pretty */
 696         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 697                total_cpus);
 698
 699         return 0;
 700 }
 701
 702 int __init acpi_boot_init(void)
 703 {
 704
 705         /*
 706          * MADT
 707          * ----
 708          * Parse the Multiple APIC Description Table (MADT), if exists.
 709          * Note that this table provides platform SMP configuration
 710          * information -- the successor to MPS tables.
 711          */
 712
 713         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 714                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 715                 goto skip_madt;
 716         }
 717
 718         /* Local APIC */
 719
 720         if (acpi_table_parse_madt
 721             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 722                 printk(KERN_ERR PREFIX
 723                        "Error parsing LAPIC address override entry\n");
 724
 725         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 726             < 0)
 727                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 728
 729         /* I/O APIC */
 730
 731         if (acpi_table_parse_madt
 732             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 733                 if (!ia64_platform_is("sn2"))
 734                         printk(KERN_ERR PREFIX
 735                                "Error parsing MADT - no IOSAPIC entries\n");
 736         }
 737
 738         /* System-Level Interrupt Routing */
 739
 740         if (acpi_table_parse_madt
 741             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 742              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 743                 printk(KERN_ERR PREFIX
 744                        "Error parsing platform interrupt source entry\n");
 745
 746         if (acpi_table_parse_madt
 747             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 748                 printk(KERN_ERR PREFIX
 749                        "Error parsing interrupt source overrides entry\n");
 750
 751         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 752                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 753       skip_madt:
 754
 755         /*
 756          * FADT says whether a legacy keyboard controller is present.
 757          * The FADT also contains an SCI_INT line, by which the system
 758          * gets interrupts such as power and sleep buttons.  If it's not
 759          * on a Legacy interrupt, it needs to be setup.
 760          */
 761         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 762                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 763
 764 #ifdef CONFIG_ACPI_NUMA
 765 #ifdef CONFIG_SMP
 766         if (srat_num_cpus == 0) {
 767                 int cpu, i = 1;
 768                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 769                         if (smp_boot_data.cpu_phys_id[cpu] !=
 770                             hard_smp_processor_id())
 771                                 node_cpuid[i++].phys_id =
 772                                     smp_boot_data.cpu_phys_id[cpu];
 773         }
 774 #endif
 775         build_cpu_to_node_map();
 776 #endif
 777         return 0;
 778 }
 779
 780 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 781 {
 782         int tmp;
 783
 784         if (has_8259 && gsi < 16)
 785                 *irq = isa_irq_to_vector(gsi);
 786         else {
 787                 tmp = gsi_to_irq(gsi);
 788                 if (tmp == -1)
 789                         return -1;
 790                 *irq = tmp;
 791         }
 792         return 0;
 793 }
 794
 795 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
 796 {
 797         if (isa_irq >= 16)
 798                 return -1;
 799         *gsi = isa_irq;
 800         return 0;
 801 }
 802
 803 /*
 804  *  ACPI based hotplug CPU support
 805  */
 806 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 807 static __cpuinit
 808 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 809 {
 810 #ifdef CONFIG_ACPI_NUMA
 811         int pxm_id;
 812         int nid;
 813
 814         pxm_id = acpi_get_pxm(handle);
 815         /*
 816          * We don't have cpu-only-node hotadd. But if the system equips
 817          * SRAT table, pxm is already found and node is ready.
 818          * So, just pxm_to_nid(pxm) is OK.
 819          * This code here is for the system which doesn't have full SRAT
 820          * table for possible cpus.
 821          */
 822         nid = acpi_map_pxm_to_node(pxm_id);
 823         node_cpuid[cpu].phys_id = physid;
 824         node_cpuid[cpu].nid = nid;
 825 #endif
 826         return (0);
 827 }
 828
 829 int additional_cpus __initdata = -1;
 830
 831 static __init int setup_additional_cpus(char *s)
 832 {
 833         if (s)
 834                 additional_cpus = simple_strtol(s, NULL, 0);
 835
 836         return 0;
 837 }
 838
 839 early_param("additional_cpus", setup_additional_cpus);
 840
 841 /*
 842  * cpu_possible_mask should be static, it cannot change as CPUs
 843  * are onlined, or offlined. The reason is per-cpu data-structures
 844  * are allocated by some modules at init time, and dont expect to
 845  * do this dynamically on cpu arrival/departure.
 846  * cpu_present_mask on the other hand can change dynamically.
 847  * In case when cpu_hotplug is not compiled, then we resort to current
 848  * behaviour, which is cpu_possible == cpu_present.
 849  * - Ashok Raj
 850  *
 851  * Three ways to find out the number of additional hotplug CPUs:
 852  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 853  * - The user can overwrite it with additional_cpus=NUM
 854  * - Otherwise don't reserve additional CPUs.
 855  */
 856 __init void prefill_possible_map(void)
 857 {
 858         int i;
 859         int possible, disabled_cpus;
 860
 861         disabled_cpus = total_cpus - available_cpus;
 862
 863         if (additional_cpus == -1) {
 864                 if (disabled_cpus > 0)
 865                         additional_cpus = disabled_cpus;
 866                 else
 867                         additional_cpus = 0;
 868         }
 869
 870         possible = available_cpus + additional_cpus;
 871
 872         if (possible > nr_cpu_ids)
 873                 possible = nr_cpu_ids;
 874
 875         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 876                 possible, max((possible - available_cpus), 0));
 877
 878         for (i = 0; i < possible; i++)
 879                 set_cpu_possible(i, true);
 880 }
 881
 882 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
 883 {
 884         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 885         union acpi_object *obj;
 886         struct acpi_madt_local_sapic *lsapic;
 887         cpumask_t tmp_map;
 888         int cpu, physid;
 889
 890         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 891                 return -EINVAL;
 892
 893         if (!buffer.length || !buffer.pointer)
 894                 return -EINVAL;
 895
 896         obj = buffer.pointer;
 897         if (obj->type != ACPI_TYPE_BUFFER)
 898         {
 899                 kfree(buffer.pointer);
 900                 return -EINVAL;
 901         }
 902
 903         lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
 904
 905         if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
 906             (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
 907                 kfree(buffer.pointer);
 908                 return -EINVAL;
 909         }
 910
 911         physid = ((lsapic->id << 8) | (lsapic->eid));
 912
 913         kfree(buffer.pointer);
 914         buffer.length = ACPI_ALLOCATE_BUFFER;
 915         buffer.pointer = NULL;
 916
 917         cpumask_complement(&tmp_map, cpu_present_mask);
 918         cpu = cpumask_first(&tmp_map);
 919         if (cpu >= nr_cpu_ids)
 920                 return -EINVAL;
 921
 922         acpi_map_cpu2node(handle, cpu, physid);
 923
 924         set_cpu_present(cpu, true);
 925         ia64_cpu_to_sapicid[cpu] = physid;
 926
 927         acpi_processor_set_pdc(handle);
 928
 929         *pcpu = cpu;
 930         return (0);
 931 }
 932
 933 /* wrapper to silence section mismatch warning */
 934 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
 935 {
 936         return _acpi_map_lsapic(handle, pcpu);
 937 }
 938 EXPORT_SYMBOL(acpi_map_lsapic);
 939
 940 int acpi_unmap_lsapic(int cpu)
 941 {
 942         ia64_cpu_to_sapicid[cpu] = -1;
 943         set_cpu_present(cpu, false);
 944
 945 #ifdef CONFIG_ACPI_NUMA
 946         /* NUMA specific cleanup's */
 947 #endif
 948
 949         return (0);
 950 }
 951
 952 EXPORT_SYMBOL(acpi_unmap_lsapic);
 953 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 954
 955 #ifdef CONFIG_ACPI_NUMA
 956 static acpi_status __devinit
 957 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
 958 {
 959         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 960         union acpi_object *obj;
 961         struct acpi_madt_io_sapic *iosapic;
 962         unsigned int gsi_base;
 963         int pxm, node;
 964
 965         /* Only care about objects w/ a method that returns the MADT */
 966         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 967                 return AE_OK;
 968
 969         if (!buffer.length || !buffer.pointer)
 970                 return AE_OK;
 971
 972         obj = buffer.pointer;
 973         if (obj->type != ACPI_TYPE_BUFFER ||
 974             obj->buffer.length < sizeof(*iosapic)) {
 975                 kfree(buffer.pointer);
 976                 return AE_OK;
 977         }
 978
 979         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 980
 981         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 982                 kfree(buffer.pointer);
 983                 return AE_OK;
 984         }
 985
 986         gsi_base = iosapic->global_irq_base;
 987
 988         kfree(buffer.pointer);
 989
 990         /*
 991          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
 992          * us which node to associate this with.
 993          */
 994         pxm = acpi_get_pxm(handle);
 995         if (pxm < 0)
 996                 return AE_OK;
 997
 998         node = pxm_to_node(pxm);
 999
1000         if (node >= MAX_NUMNODES || !node_online(node) ||
1001             cpumask_empty(cpumask_of_node(node)))
1002                 return AE_OK;
1003
1004         /* We know a gsi to node mapping! */
1005         map_iosapic_to_node(gsi_base, node);
1006         return AE_OK;
1007 }
1008
1009 static int __init
1010 acpi_map_iosapics (void)
1011 {
1012         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
1013         return 0;
1014 }
1015
1016 fs_initcall(acpi_map_iosapics);
1017 #endif                          /* CONFIG_ACPI_NUMA */
1018
1019 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
1020 {
1021         int err;
1022
1023         if ((err = iosapic_init(phys_addr, gsi_base)))
1024                 return err;
1025
1026 #ifdef CONFIG_ACPI_NUMA
1027         acpi_map_iosapic(handle, 0, NULL, NULL);
1028 #endif                          /* CONFIG_ACPI_NUMA */
1029
1030         return 0;
1031 }
1032
1033 EXPORT_SYMBOL(acpi_register_ioapic);
1034
1035 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1036 {
1037         return iosapic_remove(gsi_base);
1038 }
1039
1040 EXPORT_SYMBOL(acpi_unregister_ioapic);
1041
1042 /*
1043  * acpi_suspend_lowlevel() - save kernel state and suspend.
1044  *
1045  * TBD when when IA64 starts to support suspend...
1046  */
1047 int acpi_suspend_lowlevel(void) { return 0; }