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 PREFIX                  "ACPI: "
  58
  59 int acpi_lapic;
  60 unsigned int acpi_cpei_override;
  61 unsigned int acpi_cpei_phys_cpuid;
  62
  63 unsigned long acpi_wakeup_address = 0;
  64
  65 #ifdef CONFIG_IA64_GENERIC
  66 static unsigned long __init acpi_find_rsdp(void)
  67 {
  68         unsigned long rsdp_phys = 0;
  69
  70         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  71                 rsdp_phys = efi.acpi20;
  72         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  73                 printk(KERN_WARNING PREFIX
  74                        "v1.0/r0.71 tables no longer supported\n");
  75         return rsdp_phys;
  76 }
  77
  78 const char __init *
  79 acpi_get_sysname(void)
  80 {
  81         unsigned long rsdp_phys;
  82         struct acpi_table_rsdp *rsdp;
  83         struct acpi_table_xsdt *xsdt;
  84         struct acpi_table_header *hdr;
  85 #ifdef CONFIG_INTEL_IOMMU
  86         u64 i, nentries;
  87 #endif
  88
  89         rsdp_phys = acpi_find_rsdp();
  90         if (!rsdp_phys) {
  91                 printk(KERN_ERR
  92                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  93                 return "dig";
  94         }
  95
  96         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
  97         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
  98                 printk(KERN_ERR
  99                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
 100                 return "dig";
 101         }
 102
 103         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 104         hdr = &xsdt->header;
 105         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 106                 printk(KERN_ERR
 107                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 108                 return "dig";
 109         }
 110
 111         if (!strcmp(hdr->oem_id, "HP")) {
 112                 return "hpzx1";
 113         } else if (!strcmp(hdr->oem_id, "SGI")) {
 114                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
 115                         return "uv";
 116                 else
 117                         return "sn2";
 118         }
 119
 120 #ifdef CONFIG_INTEL_IOMMU
 121         /* Look for Intel IOMMU */
 122         nentries = (hdr->length - sizeof(*hdr)) /
 123                          sizeof(xsdt->table_offset_entry[0]);
 124         for (i = 0; i < nentries; i++) {
 125                 hdr = __va(xsdt->table_offset_entry[i]);
 126                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
 127                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
 128                         return "dig_vtd";
 129         }
 130 #endif
 131
 132         return "dig";
 133 }
 134 #endif /* CONFIG_IA64_GENERIC */
 135
 136 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 137
 138 /* Array to record platform interrupt vectors for generic interrupt routing. */
 139 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 140         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 141 };
 142
 143 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 144
 145 /*
 146  * Interrupt routing API for device drivers.  Provides interrupt vector for
 147  * a generic platform event.  Currently only CPEI is implemented.
 148  */
 149 int acpi_request_vector(u32 int_type)
 150 {
 151         int vector = -1;
 152
 153         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 154                 /* corrected platform error interrupt */
 155                 vector = platform_intr_list[int_type];
 156         } else
 157                 printk(KERN_ERR
 158                        "acpi_request_vector(): invalid interrupt type\n");
 159         return vector;
 160 }
 161
 162 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
 163 {
 164         return __va(phys);
 165 }
 166
 167 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
 168 {
 169 }
 170
 171 /* --------------------------------------------------------------------------
 172                             Boot-time Table Parsing
 173    -------------------------------------------------------------------------- */
 174
 175 static int available_cpus __initdata;
 176 struct acpi_table_madt *acpi_madt __initdata;
 177 static u8 has_8259;
 178
 179 static int __init
 180 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 181                           const unsigned long end)
 182 {
 183         struct acpi_madt_local_apic_override *lapic;
 184
 185         lapic = (struct acpi_madt_local_apic_override *)header;
 186
 187         if (BAD_MADT_ENTRY(lapic, end))
 188                 return -EINVAL;
 189
 190         if (lapic->address) {
 191                 iounmap(ipi_base_addr);
 192                 ipi_base_addr = ioremap(lapic->address, 0);
 193         }
 194         return 0;
 195 }
 196
 197 static int __init
 198 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 199 {
 200         struct acpi_madt_local_sapic *lsapic;
 201
 202         lsapic = (struct acpi_madt_local_sapic *)header;
 203
 204         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 205
 206         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 207 #ifdef CONFIG_SMP
 208                 smp_boot_data.cpu_phys_id[available_cpus] =
 209                     (lsapic->id << 8) | lsapic->eid;
 210 #endif
 211                 ++available_cpus;
 212         }
 213
 214         total_cpus++;
 215         return 0;
 216 }
 217
 218 static int __init
 219 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 220 {
 221         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 222
 223         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 224
 225         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 226                 return -EINVAL;
 227
 228         /* TBD: Support lapic_nmi entries */
 229         return 0;
 230 }
 231
 232 static int __init
 233 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 234 {
 235         struct acpi_madt_io_sapic *iosapic;
 236
 237         iosapic = (struct acpi_madt_io_sapic *)header;
 238
 239         if (BAD_MADT_ENTRY(iosapic, end))
 240                 return -EINVAL;
 241
 242         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 243 }
 244
 245 static unsigned int __initdata acpi_madt_rev;
 246
 247 static int __init
 248 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 249                         const unsigned long end)
 250 {
 251         struct acpi_madt_interrupt_source *plintsrc;
 252         int vector;
 253
 254         plintsrc = (struct acpi_madt_interrupt_source *)header;
 255
 256         if (BAD_MADT_ENTRY(plintsrc, end))
 257                 return -EINVAL;
 258
 259         /*
 260          * Get vector assignment for this interrupt, set attributes,
 261          * and program the IOSAPIC routing table.
 262          */
 263         vector = iosapic_register_platform_intr(plintsrc->type,
 264                                                 plintsrc->global_irq,
 265                                                 plintsrc->io_sapic_vector,
 266                                                 plintsrc->eid,
 267                                                 plintsrc->id,
 268                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 269                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 270                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 271                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 272                                                  ACPI_MADT_TRIGGER_EDGE) ?
 273                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 274
 275         platform_intr_list[plintsrc->type] = vector;
 276         if (acpi_madt_rev > 1) {
 277                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 278         }
 279
 280         /*
 281          * Save the physical id, so we can check when its being removed
 282          */
 283         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 284
 285         return 0;
 286 }
 287
 288 #ifdef CONFIG_HOTPLUG_CPU
 289 unsigned int can_cpei_retarget(void)
 290 {
 291         extern int cpe_vector;
 292         extern unsigned int force_cpei_retarget;
 293
 294         /*
 295          * Only if CPEI is supported and the override flag
 296          * is present, otherwise return that its re-targettable
 297          * if we are in polling mode.
 298          */
 299         if (cpe_vector > 0) {
 300                 if (acpi_cpei_override || force_cpei_retarget)
 301                         return 1;
 302                 else
 303                         return 0;
 304         }
 305         return 1;
 306 }
 307
 308 unsigned int is_cpu_cpei_target(unsigned int cpu)
 309 {
 310         unsigned int logical_id;
 311
 312         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 313
 314         if (logical_id == cpu)
 315                 return 1;
 316         else
 317                 return 0;
 318 }
 319
 320 void set_cpei_target_cpu(unsigned int cpu)
 321 {
 322         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 323 }
 324 #endif
 325
 326 unsigned int get_cpei_target_cpu(void)
 327 {
 328         return acpi_cpei_phys_cpuid;
 329 }
 330
 331 static int __init
 332 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 333                        const unsigned long end)
 334 {
 335         struct acpi_madt_interrupt_override *p;
 336
 337         p = (struct acpi_madt_interrupt_override *)header;
 338
 339         if (BAD_MADT_ENTRY(p, end))
 340                 return -EINVAL;
 341
 342         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 343                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 344                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
 345                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
 346                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 347                                  ACPI_MADT_TRIGGER_LEVEL) ?
 348                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
 349         return 0;
 350 }
 351
 352 static int __init
 353 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 354 {
 355         struct acpi_madt_nmi_source *nmi_src;
 356
 357         nmi_src = (struct acpi_madt_nmi_source *)header;
 358
 359         if (BAD_MADT_ENTRY(nmi_src, end))
 360                 return -EINVAL;
 361
 362         /* TBD: Support nimsrc entries */
 363         return 0;
 364 }
 365
 366 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 367 {
 368         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 369
 370                 /*
 371                  * Unfortunately ITC_DRIFT is not yet part of the
 372                  * official SAL spec, so the ITC_DRIFT bit is not
 373                  * set by the BIOS on this hardware.
 374                  */
 375                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 376
 377                 cyclone_setup();
 378         }
 379 }
 380
 381 static int __init acpi_parse_madt(struct acpi_table_header *table)
 382 {
 383         acpi_madt = (struct acpi_table_madt *)table;
 384
 385         acpi_madt_rev = acpi_madt->header.revision;
 386
 387         /* remember the value for reference after free_initmem() */
 388 #ifdef CONFIG_ITANIUM
 389         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 390 #else
 391         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 392 #endif
 393         iosapic_system_init(has_8259);
 394
 395         /* Get base address of IPI Message Block */
 396
 397         if (acpi_madt->address)
 398                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 399
 400         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 401
 402         acpi_madt_oem_check(acpi_madt->header.oem_id,
 403                             acpi_madt->header.oem_table_id);
 404
 405         return 0;
 406 }
 407
 408 #ifdef CONFIG_ACPI_NUMA
 409
 410 #undef SLIT_DEBUG
 411
 412 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 413
 414 static int __initdata srat_num_cpus;    /* number of cpus */
 415 static u32 pxm_flag[PXM_FLAG_LEN];
 416 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 417 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 418 static struct acpi_table_slit __initdata *slit_table;
 419 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 420
 421 static int __init
 422 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 423 {
 424         int pxm;
 425
 426         pxm = pa->proximity_domain_lo;
 427         if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
 428                 pxm += pa->proximity_domain_hi[0] << 8;
 429         return pxm;
 430 }
 431
 432 static int __init
 433 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 434 {
 435         int pxm;
 436
 437         pxm = ma->proximity_domain;
 438         if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
 439                 pxm &= 0xff;
 440
 441         return pxm;
 442 }
 443
 444 /*
 445  * ACPI 2.0 SLIT (System Locality Information Table)
 446  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 447  */
 448 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 449 {
 450         u32 len;
 451
 452         len = sizeof(struct acpi_table_header) + 8
 453             + slit->locality_count * slit->locality_count;
 454         if (slit->header.length != len) {
 455                 printk(KERN_ERR
 456                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 457                        len, slit->header.length);
 458                 return;
 459         }
 460         slit_table = slit;
 461 }
 462
 463 void __init
 464 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 465 {
 466         int pxm;
 467
 468         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 469                 return;
 470
 471         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
 472                 printk_once(KERN_WARNING
 473                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
 474                             ARRAY_SIZE(node_cpuid));
 475                 return;
 476         }
 477         pxm = get_processor_proximity_domain(pa);
 478
 479         /* record this node in proximity bitmap */
 480         pxm_bit_set(pxm);
 481
 482         node_cpuid[srat_num_cpus].phys_id =
 483             (pa->apic_id << 8) | (pa->local_sapic_eid);
 484         /* nid should be overridden as logical node id later */
 485         node_cpuid[srat_num_cpus].nid = pxm;
 486         cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
 487         srat_num_cpus++;
 488 }
 489
 490 int __init
 491 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 492 {
 493         unsigned long paddr, size;
 494         int pxm;
 495         struct node_memblk_s *p, *q, *pend;
 496
 497         pxm = get_memory_proximity_domain(ma);
 498
 499         /* fill node memory chunk structure */
 500         paddr = ma->base_address;
 501         size = ma->length;
 502
 503         /* Ignore disabled entries */
 504         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 505                 return -1;
 506
 507         if (num_node_memblks >= NR_NODE_MEMBLKS) {
 508                 pr_err("NUMA: too many memblk ranges\n");
 509                 return -EINVAL;
 510         }
 511
 512         /* record this node in proximity bitmap */
 513         pxm_bit_set(pxm);
 514
 515         /* Insertion sort based on base address */
 516         pend = &node_memblk[num_node_memblks];
 517         for (p = &node_memblk[0]; p < pend; p++) {
 518                 if (paddr < p->start_paddr)
 519                         break;
 520         }
 521         if (p < pend) {
 522                 for (q = pend - 1; q >= p; q--)
 523                         *(q + 1) = *q;
 524         }
 525         p->start_paddr = paddr;
 526         p->size = size;
 527         p->nid = pxm;
 528         num_node_memblks++;
 529         return 0;
 530 }
 531
 532 void __init acpi_numa_fixup(void)
 533 {
 534         int i, j, node_from, node_to;
 535
 536         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 537         if (srat_num_cpus == 0) {
 538                 node_set_online(0);
 539                 node_cpuid[0].phys_id = hard_smp_processor_id();
 540                 node_distance(0, 0) = LOCAL_DISTANCE;
 541                 goto out;
 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                 goto out;
 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 out:
 610         node_possible_map = node_online_map;
 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 EXPORT_SYMBOL_GPL(acpi_register_gsi);
 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 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
 647
 648 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 649 {
 650         struct acpi_table_header *fadt_header;
 651         struct acpi_table_fadt *fadt;
 652
 653         fadt_header = (struct acpi_table_header *)table;
 654         if (fadt_header->revision != 3)
 655                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 656
 657         fadt = (struct acpi_table_fadt *)fadt_header;
 658
 659         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
 660                                  ACPI_ACTIVE_LOW);
 661         return 0;
 662 }
 663
 664 int __init early_acpi_boot_init(void)
 665 {
 666         int ret;
 667
 668         /*
 669          * do a partial walk of MADT to determine how many CPUs
 670          * we have including offline CPUs
 671          */
 672         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 673                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 674                 return 0;
 675         }
 676
 677         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 678                 acpi_parse_lsapic, NR_CPUS);
 679         if (ret < 1)
 680                 printk(KERN_ERR PREFIX
 681                        "Error parsing MADT - no LAPIC entries\n");
 682         else
 683                 acpi_lapic = 1;
 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 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 808 {
 809 #ifdef CONFIG_ACPI_NUMA
 810         /*
 811          * We don't have cpu-only-node hotadd. But if the system equips
 812          * SRAT table, pxm is already found and node is ready.
 813          * So, just pxm_to_nid(pxm) is OK.
 814          * This code here is for the system which doesn't have full SRAT
 815          * table for possible cpus.
 816          */
 817         node_cpuid[cpu].phys_id = physid;
 818         node_cpuid[cpu].nid = acpi_get_node(handle);
 819 #endif
 820         return 0;
 821 }
 822
 823 int additional_cpus __initdata = -1;
 824
 825 static __init int setup_additional_cpus(char *s)
 826 {
 827         if (s)
 828                 additional_cpus = simple_strtol(s, NULL, 0);
 829
 830         return 0;
 831 }
 832
 833 early_param("additional_cpus", setup_additional_cpus);
 834
 835 /*
 836  * cpu_possible_mask should be static, it cannot change as CPUs
 837  * are onlined, or offlined. The reason is per-cpu data-structures
 838  * are allocated by some modules at init time, and dont expect to
 839  * do this dynamically on cpu arrival/departure.
 840  * cpu_present_mask on the other hand can change dynamically.
 841  * In case when cpu_hotplug is not compiled, then we resort to current
 842  * behaviour, which is cpu_possible == cpu_present.
 843  * - Ashok Raj
 844  *
 845  * Three ways to find out the number of additional hotplug CPUs:
 846  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 847  * - The user can overwrite it with additional_cpus=NUM
 848  * - Otherwise don't reserve additional CPUs.
 849  */
 850 __init void prefill_possible_map(void)
 851 {
 852         int i;
 853         int possible, disabled_cpus;
 854
 855         disabled_cpus = total_cpus - available_cpus;
 856
 857         if (additional_cpus == -1) {
 858                 if (disabled_cpus > 0)
 859                         additional_cpus = disabled_cpus;
 860                 else
 861                         additional_cpus = 0;
 862         }
 863
 864         possible = available_cpus + additional_cpus;
 865
 866         if (possible > nr_cpu_ids)
 867                 possible = nr_cpu_ids;
 868
 869         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 870                 possible, max((possible - available_cpus), 0));
 871
 872         for (i = 0; i < possible; i++)
 873                 set_cpu_possible(i, true);
 874 }
 875
 876 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
 877 {
 878         cpumask_t tmp_map;
 879         int cpu;
 880
 881         cpumask_complement(&tmp_map, cpu_present_mask);
 882         cpu = cpumask_first(&tmp_map);
 883         if (cpu >= nr_cpu_ids)
 884                 return -EINVAL;
 885
 886         acpi_map_cpu2node(handle, cpu, physid);
 887
 888         set_cpu_present(cpu, true);
 889         ia64_cpu_to_sapicid[cpu] = physid;
 890
 891         acpi_processor_set_pdc(handle);
 892
 893         *pcpu = cpu;
 894         return (0);
 895 }
 896
 897 /* wrapper to silence section mismatch warning */
 898 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
 899                        int *pcpu)
 900 {
 901         return _acpi_map_lsapic(handle, physid, pcpu);
 902 }
 903 EXPORT_SYMBOL(acpi_map_cpu);
 904
 905 int acpi_unmap_cpu(int cpu)
 906 {
 907         ia64_cpu_to_sapicid[cpu] = -1;
 908         set_cpu_present(cpu, false);
 909
 910 #ifdef CONFIG_ACPI_NUMA
 911         /* NUMA specific cleanup's */
 912 #endif
 913
 914         return (0);
 915 }
 916 EXPORT_SYMBOL(acpi_unmap_cpu);
 917 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 918
 919 #ifdef CONFIG_ACPI_NUMA
 920 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
 921                                     void *context, void **ret)
 922 {
 923         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 924         union acpi_object *obj;
 925         struct acpi_madt_io_sapic *iosapic;
 926         unsigned int gsi_base;
 927         int node;
 928
 929         /* Only care about objects w/ a method that returns the MADT */
 930         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 931                 return AE_OK;
 932
 933         if (!buffer.length || !buffer.pointer)
 934                 return AE_OK;
 935
 936         obj = buffer.pointer;
 937         if (obj->type != ACPI_TYPE_BUFFER ||
 938             obj->buffer.length < sizeof(*iosapic)) {
 939                 kfree(buffer.pointer);
 940                 return AE_OK;
 941         }
 942
 943         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 944
 945         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 946                 kfree(buffer.pointer);
 947                 return AE_OK;
 948         }
 949
 950         gsi_base = iosapic->global_irq_base;
 951
 952         kfree(buffer.pointer);
 953
 954         /* OK, it's an IOSAPIC MADT entry; associate it with a node */
 955         node = acpi_get_node(handle);
 956         if (node == NUMA_NO_NODE || !node_online(node) ||
 957             cpumask_empty(cpumask_of_node(node)))
 958                 return AE_OK;
 959
 960         /* We know a gsi to node mapping! */
 961         map_iosapic_to_node(gsi_base, node);
 962         return AE_OK;
 963 }
 964
 965 static int __init
 966 acpi_map_iosapics (void)
 967 {
 968         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 969         return 0;
 970 }
 971
 972 fs_initcall(acpi_map_iosapics);
 973 #endif                          /* CONFIG_ACPI_NUMA */
 974
 975 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 976 {
 977         int err;
 978
 979         if ((err = iosapic_init(phys_addr, gsi_base)))
 980                 return err;
 981
 982 #ifdef CONFIG_ACPI_NUMA
 983         acpi_map_iosapic(handle, 0, NULL, NULL);
 984 #endif                          /* CONFIG_ACPI_NUMA */
 985
 986         return 0;
 987 }
 988
 989 EXPORT_SYMBOL(acpi_register_ioapic);
 990
 991 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 992 {
 993         return iosapic_remove(gsi_base);
 994 }
 995
 996 EXPORT_SYMBOL(acpi_unregister_ioapic);
 997
 998 /*
 999  * acpi_suspend_lowlevel() - save kernel state and suspend.
1000  *
1001  * TBD when when IA64 starts to support suspend...
1002  */
1003 int acpi_suspend_lowlevel(void) { return 0; }