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 unsigned int acpi_cpei_override;
  60 unsigned int acpi_cpei_phys_cpuid;
  61
  62 unsigned long acpi_wakeup_address = 0;
  63
  64 #ifdef CONFIG_IA64_GENERIC
  65 static unsigned long __init acpi_find_rsdp(void)
  66 {
  67         unsigned long rsdp_phys = 0;
  68
  69         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
  70                 rsdp_phys = efi.acpi20;
  71         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
  72                 printk(KERN_WARNING PREFIX
  73                        "v1.0/r0.71 tables no longer supported\n");
  74         return rsdp_phys;
  75 }
  76
  77 const char __init *
  78 acpi_get_sysname(void)
  79 {
  80         unsigned long rsdp_phys;
  81         struct acpi_table_rsdp *rsdp;
  82         struct acpi_table_xsdt *xsdt;
  83         struct acpi_table_header *hdr;
  84 #ifdef CONFIG_INTEL_IOMMU
  85         u64 i, nentries;
  86 #endif
  87
  88         rsdp_phys = acpi_find_rsdp();
  89         if (!rsdp_phys) {
  90                 printk(KERN_ERR
  91                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
  92                 return "dig";
  93         }
  94
  95         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
  96         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
  97                 printk(KERN_ERR
  98                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
  99                 return "dig";
 100         }
 101
 102         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
 103         hdr = &xsdt->header;
 104         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
 105                 printk(KERN_ERR
 106                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
 107                 return "dig";
 108         }
 109
 110         if (!strcmp(hdr->oem_id, "HP")) {
 111                 return "hpzx1";
 112         } else if (!strcmp(hdr->oem_id, "SGI")) {
 113                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
 114                         return "uv";
 115                 else
 116                         return "sn2";
 117         }
 118
 119 #ifdef CONFIG_INTEL_IOMMU
 120         /* Look for Intel IOMMU */
 121         nentries = (hdr->length - sizeof(*hdr)) /
 122                          sizeof(xsdt->table_offset_entry[0]);
 123         for (i = 0; i < nentries; i++) {
 124                 hdr = __va(xsdt->table_offset_entry[i]);
 125                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
 126                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
 127                         return "dig_vtd";
 128         }
 129 #endif
 130
 131         return "dig";
 132 }
 133 #endif /* CONFIG_IA64_GENERIC */
 134
 135 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
 136
 137 /* Array to record platform interrupt vectors for generic interrupt routing. */
 138 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
 139         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
 140 };
 141
 142 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
 143
 144 /*
 145  * Interrupt routing API for device drivers.  Provides interrupt vector for
 146  * a generic platform event.  Currently only CPEI is implemented.
 147  */
 148 int acpi_request_vector(u32 int_type)
 149 {
 150         int vector = -1;
 151
 152         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
 153                 /* corrected platform error interrupt */
 154                 vector = platform_intr_list[int_type];
 155         } else
 156                 printk(KERN_ERR
 157                        "acpi_request_vector(): invalid interrupt type\n");
 158         return vector;
 159 }
 160
 161 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 162 {
 163         return __va(phys_addr);
 164 }
 165
 166 void __init __acpi_unmap_table(char *map, unsigned long size)
 167 {
 168 }
 169
 170 /* --------------------------------------------------------------------------
 171                             Boot-time Table Parsing
 172    -------------------------------------------------------------------------- */
 173
 174 static int available_cpus __initdata;
 175 struct acpi_table_madt *acpi_madt __initdata;
 176 static u8 has_8259;
 177
 178 static int __init
 179 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
 180                           const unsigned long end)
 181 {
 182         struct acpi_madt_local_apic_override *lapic;
 183
 184         lapic = (struct acpi_madt_local_apic_override *)header;
 185
 186         if (BAD_MADT_ENTRY(lapic, end))
 187                 return -EINVAL;
 188
 189         if (lapic->address) {
 190                 iounmap(ipi_base_addr);
 191                 ipi_base_addr = ioremap(lapic->address, 0);
 192         }
 193         return 0;
 194 }
 195
 196 static int __init
 197 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
 198 {
 199         struct acpi_madt_local_sapic *lsapic;
 200
 201         lsapic = (struct acpi_madt_local_sapic *)header;
 202
 203         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
 204
 205         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
 206 #ifdef CONFIG_SMP
 207                 smp_boot_data.cpu_phys_id[available_cpus] =
 208                     (lsapic->id << 8) | lsapic->eid;
 209 #endif
 210                 ++available_cpus;
 211         }
 212
 213         total_cpus++;
 214         return 0;
 215 }
 216
 217 static int __init
 218 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
 219 {
 220         struct acpi_madt_local_apic_nmi *lacpi_nmi;
 221
 222         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
 223
 224         if (BAD_MADT_ENTRY(lacpi_nmi, end))
 225                 return -EINVAL;
 226
 227         /* TBD: Support lapic_nmi entries */
 228         return 0;
 229 }
 230
 231 static int __init
 232 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
 233 {
 234         struct acpi_madt_io_sapic *iosapic;
 235
 236         iosapic = (struct acpi_madt_io_sapic *)header;
 237
 238         if (BAD_MADT_ENTRY(iosapic, end))
 239                 return -EINVAL;
 240
 241         return iosapic_init(iosapic->address, iosapic->global_irq_base);
 242 }
 243
 244 static unsigned int __initdata acpi_madt_rev;
 245
 246 static int __init
 247 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
 248                         const unsigned long end)
 249 {
 250         struct acpi_madt_interrupt_source *plintsrc;
 251         int vector;
 252
 253         plintsrc = (struct acpi_madt_interrupt_source *)header;
 254
 255         if (BAD_MADT_ENTRY(plintsrc, end))
 256                 return -EINVAL;
 257
 258         /*
 259          * Get vector assignment for this interrupt, set attributes,
 260          * and program the IOSAPIC routing table.
 261          */
 262         vector = iosapic_register_platform_intr(plintsrc->type,
 263                                                 plintsrc->global_irq,
 264                                                 plintsrc->io_sapic_vector,
 265                                                 plintsrc->eid,
 266                                                 plintsrc->id,
 267                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 268                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
 269                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
 270                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 271                                                  ACPI_MADT_TRIGGER_EDGE) ?
 272                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
 273
 274         platform_intr_list[plintsrc->type] = vector;
 275         if (acpi_madt_rev > 1) {
 276                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
 277         }
 278
 279         /*
 280          * Save the physical id, so we can check when its being removed
 281          */
 282         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
 283
 284         return 0;
 285 }
 286
 287 #ifdef CONFIG_HOTPLUG_CPU
 288 unsigned int can_cpei_retarget(void)
 289 {
 290         extern int cpe_vector;
 291         extern unsigned int force_cpei_retarget;
 292
 293         /*
 294          * Only if CPEI is supported and the override flag
 295          * is present, otherwise return that its re-targettable
 296          * if we are in polling mode.
 297          */
 298         if (cpe_vector > 0) {
 299                 if (acpi_cpei_override || force_cpei_retarget)
 300                         return 1;
 301                 else
 302                         return 0;
 303         }
 304         return 1;
 305 }
 306
 307 unsigned int is_cpu_cpei_target(unsigned int cpu)
 308 {
 309         unsigned int logical_id;
 310
 311         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
 312
 313         if (logical_id == cpu)
 314                 return 1;
 315         else
 316                 return 0;
 317 }
 318
 319 void set_cpei_target_cpu(unsigned int cpu)
 320 {
 321         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
 322 }
 323 #endif
 324
 325 unsigned int get_cpei_target_cpu(void)
 326 {
 327         return acpi_cpei_phys_cpuid;
 328 }
 329
 330 static int __init
 331 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
 332                        const unsigned long end)
 333 {
 334         struct acpi_madt_interrupt_override *p;
 335
 336         p = (struct acpi_madt_interrupt_override *)header;
 337
 338         if (BAD_MADT_ENTRY(p, end))
 339                 return -EINVAL;
 340
 341         iosapic_override_isa_irq(p->source_irq, p->global_irq,
 342                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
 343                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
 344                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
 345                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
 346                                  ACPI_MADT_TRIGGER_LEVEL) ?
 347                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
 348         return 0;
 349 }
 350
 351 static int __init
 352 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
 353 {
 354         struct acpi_madt_nmi_source *nmi_src;
 355
 356         nmi_src = (struct acpi_madt_nmi_source *)header;
 357
 358         if (BAD_MADT_ENTRY(nmi_src, end))
 359                 return -EINVAL;
 360
 361         /* TBD: Support nimsrc entries */
 362         return 0;
 363 }
 364
 365 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 366 {
 367         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
 368
 369                 /*
 370                  * Unfortunately ITC_DRIFT is not yet part of the
 371                  * official SAL spec, so the ITC_DRIFT bit is not
 372                  * set by the BIOS on this hardware.
 373                  */
 374                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
 375
 376                 cyclone_setup();
 377         }
 378 }
 379
 380 static int __init acpi_parse_madt(struct acpi_table_header *table)
 381 {
 382         if (!table)
 383                 return -EINVAL;
 384
 385         acpi_madt = (struct acpi_table_madt *)table;
 386
 387         acpi_madt_rev = acpi_madt->header.revision;
 388
 389         /* remember the value for reference after free_initmem() */
 390 #ifdef CONFIG_ITANIUM
 391         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
 392 #else
 393         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
 394 #endif
 395         iosapic_system_init(has_8259);
 396
 397         /* Get base address of IPI Message Block */
 398
 399         if (acpi_madt->address)
 400                 ipi_base_addr = ioremap(acpi_madt->address, 0);
 401
 402         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
 403
 404         acpi_madt_oem_check(acpi_madt->header.oem_id,
 405                             acpi_madt->header.oem_table_id);
 406
 407         return 0;
 408 }
 409
 410 #ifdef CONFIG_ACPI_NUMA
 411
 412 #undef SLIT_DEBUG
 413
 414 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
 415
 416 static int __initdata srat_num_cpus;    /* number of cpus */
 417 static u32 pxm_flag[PXM_FLAG_LEN];
 418 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
 419 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
 420 static struct acpi_table_slit __initdata *slit_table;
 421 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
 422
 423 static int __init
 424 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 425 {
 426         int pxm;
 427
 428         pxm = pa->proximity_domain_lo;
 429         if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
 430                 pxm += pa->proximity_domain_hi[0] << 8;
 431         return pxm;
 432 }
 433
 434 static int __init
 435 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 436 {
 437         int pxm;
 438
 439         pxm = ma->proximity_domain;
 440         if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
 441                 pxm &= 0xff;
 442
 443         return pxm;
 444 }
 445
 446 /*
 447  * ACPI 2.0 SLIT (System Locality Information Table)
 448  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 449  */
 450 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 451 {
 452         u32 len;
 453
 454         len = sizeof(struct acpi_table_header) + 8
 455             + slit->locality_count * slit->locality_count;
 456         if (slit->header.length != len) {
 457                 printk(KERN_ERR
 458                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
 459                        len, slit->header.length);
 460                 return;
 461         }
 462         slit_table = slit;
 463 }
 464
 465 void __init
 466 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
 467 {
 468         int pxm;
 469
 470         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
 471                 return;
 472
 473         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
 474                 printk_once(KERN_WARNING
 475                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
 476                             ARRAY_SIZE(node_cpuid));
 477                 return;
 478         }
 479         pxm = get_processor_proximity_domain(pa);
 480
 481         /* record this node in proximity bitmap */
 482         pxm_bit_set(pxm);
 483
 484         node_cpuid[srat_num_cpus].phys_id =
 485             (pa->apic_id << 8) | (pa->local_sapic_eid);
 486         /* nid should be overridden as logical node id later */
 487         node_cpuid[srat_num_cpus].nid = pxm;
 488         cpu_set(srat_num_cpus, early_cpu_possible_map);
 489         srat_num_cpus++;
 490 }
 491
 492 int __init
 493 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 494 {
 495         unsigned long paddr, size;
 496         int pxm;
 497         struct node_memblk_s *p, *q, *pend;
 498
 499         pxm = get_memory_proximity_domain(ma);
 500
 501         /* fill node memory chunk structure */
 502         paddr = ma->base_address;
 503         size = ma->length;
 504
 505         /* Ignore disabled entries */
 506         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
 507                 return -1;
 508
 509         /* record this node in proximity bitmap */
 510         pxm_bit_set(pxm);
 511
 512         /* Insertion sort based on base address */
 513         pend = &node_memblk[num_node_memblks];
 514         for (p = &node_memblk[0]; p < pend; p++) {
 515                 if (paddr < p->start_paddr)
 516                         break;
 517         }
 518         if (p < pend) {
 519                 for (q = pend - 1; q >= p; q--)
 520                         *(q + 1) = *q;
 521         }
 522         p->start_paddr = paddr;
 523         p->size = size;
 524         p->nid = pxm;
 525         num_node_memblks++;
 526         return 0;
 527 }
 528
 529 void __init acpi_numa_arch_fixup(void)
 530 {
 531         int i, j, node_from, node_to;
 532
 533         /* If there's no SRAT, fix the phys_id and mark node 0 online */
 534         if (srat_num_cpus == 0) {
 535                 node_set_online(0);
 536                 node_cpuid[0].phys_id = hard_smp_processor_id();
 537                 return;
 538         }
 539
 540         /*
 541          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
 542          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
 543          */
 544         nodes_clear(node_online_map);
 545         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
 546                 if (pxm_bit_test(i)) {
 547                         int nid = acpi_map_pxm_to_node(i);
 548                         node_set_online(nid);
 549                 }
 550         }
 551
 552         /* set logical node id in memory chunk structure */
 553         for (i = 0; i < num_node_memblks; i++)
 554                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
 555
 556         /* assign memory bank numbers for each chunk on each node */
 557         for_each_online_node(i) {
 558                 int bank;
 559
 560                 bank = 0;
 561                 for (j = 0; j < num_node_memblks; j++)
 562                         if (node_memblk[j].nid == i)
 563                                 node_memblk[j].bank = bank++;
 564         }
 565
 566         /* set logical node id in cpu structure */
 567         for_each_possible_early_cpu(i)
 568                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
 569
 570         printk(KERN_INFO "Number of logical nodes in system = %d\n",
 571                num_online_nodes());
 572         printk(KERN_INFO "Number of memory chunks in system = %d\n",
 573                num_node_memblks);
 574
 575         if (!slit_table) {
 576                 for (i = 0; i < MAX_NUMNODES; i++)
 577                         for (j = 0; j < MAX_NUMNODES; j++)
 578                                 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
 579                                                         REMOTE_DISTANCE;
 580                 return;
 581         }
 582
 583         memset(numa_slit, -1, sizeof(numa_slit));
 584         for (i = 0; i < slit_table->locality_count; i++) {
 585                 if (!pxm_bit_test(i))
 586                         continue;
 587                 node_from = pxm_to_node(i);
 588                 for (j = 0; j < slit_table->locality_count; j++) {
 589                         if (!pxm_bit_test(j))
 590                                 continue;
 591                         node_to = pxm_to_node(j);
 592                         node_distance(node_from, node_to) =
 593                             slit_table->entry[i * slit_table->locality_count + j];
 594                 }
 595         }
 596
 597 #ifdef SLIT_DEBUG
 598         printk("ACPI 2.0 SLIT locality table:\n");
 599         for_each_online_node(i) {
 600                 for_each_online_node(j)
 601                     printk("%03d ", node_distance(i, j));
 602                 printk("\n");
 603         }
 604 #endif
 605 }
 606 #endif                          /* CONFIG_ACPI_NUMA */
 607
 608 /*
 609  * success: return IRQ number (>=0)
 610  * failure: return < 0
 611  */
 612 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
 613 {
 614         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 615                 return gsi;
 616
 617         if (has_8259 && gsi < 16)
 618                 return isa_irq_to_vector(gsi);
 619
 620         return iosapic_register_intr(gsi,
 621                                      (polarity ==
 622                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 623                                      IOSAPIC_POL_LOW,
 624                                      (triggering ==
 625                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 626                                      IOSAPIC_LEVEL);
 627 }
 628 EXPORT_SYMBOL_GPL(acpi_register_gsi);
 629
 630 void acpi_unregister_gsi(u32 gsi)
 631 {
 632         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
 633                 return;
 634
 635         if (has_8259 && gsi < 16)
 636                 return;
 637
 638         iosapic_unregister_intr(gsi);
 639 }
 640 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
 641
 642 static int __init acpi_parse_fadt(struct acpi_table_header *table)
 643 {
 644         struct acpi_table_header *fadt_header;
 645         struct acpi_table_fadt *fadt;
 646
 647         if (!table)
 648                 return -EINVAL;
 649
 650         fadt_header = (struct acpi_table_header *)table;
 651         if (fadt_header->revision != 3)
 652                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
 653
 654         fadt = (struct acpi_table_fadt *)fadt_header;
 655
 656         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
 657                                  ACPI_ACTIVE_LOW);
 658         return 0;
 659 }
 660
 661 int __init early_acpi_boot_init(void)
 662 {
 663         int ret;
 664
 665         /*
 666          * do a partial walk of MADT to determine how many CPUs
 667          * we have including offline CPUs
 668          */
 669         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 670                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 671                 return 0;
 672         }
 673
 674         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
 675                 acpi_parse_lsapic, NR_CPUS);
 676         if (ret < 1)
 677                 printk(KERN_ERR PREFIX
 678                        "Error parsing MADT - no LAPIC entries\n");
 679
 680 #ifdef CONFIG_SMP
 681         if (available_cpus == 0) {
 682                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
 683                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
 684                 smp_boot_data.cpu_phys_id[available_cpus] =
 685                     hard_smp_processor_id();
 686                 available_cpus = 1;     /* We've got at least one of these, no? */
 687         }
 688         smp_boot_data.cpu_count = available_cpus;
 689 #endif
 690         /* Make boot-up look pretty */
 691         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
 692                total_cpus);
 693
 694         return 0;
 695 }
 696
 697 int __init acpi_boot_init(void)
 698 {
 699
 700         /*
 701          * MADT
 702          * ----
 703          * Parse the Multiple APIC Description Table (MADT), if exists.
 704          * Note that this table provides platform SMP configuration
 705          * information -- the successor to MPS tables.
 706          */
 707
 708         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
 709                 printk(KERN_ERR PREFIX "Can't find MADT\n");
 710                 goto skip_madt;
 711         }
 712
 713         /* Local APIC */
 714
 715         if (acpi_table_parse_madt
 716             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
 717                 printk(KERN_ERR PREFIX
 718                        "Error parsing LAPIC address override entry\n");
 719
 720         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
 721             < 0)
 722                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
 723
 724         /* I/O APIC */
 725
 726         if (acpi_table_parse_madt
 727             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
 728                 if (!ia64_platform_is("sn2"))
 729                         printk(KERN_ERR PREFIX
 730                                "Error parsing MADT - no IOSAPIC entries\n");
 731         }
 732
 733         /* System-Level Interrupt Routing */
 734
 735         if (acpi_table_parse_madt
 736             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
 737              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
 738                 printk(KERN_ERR PREFIX
 739                        "Error parsing platform interrupt source entry\n");
 740
 741         if (acpi_table_parse_madt
 742             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
 743                 printk(KERN_ERR PREFIX
 744                        "Error parsing interrupt source overrides entry\n");
 745
 746         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
 747                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
 748       skip_madt:
 749
 750         /*
 751          * FADT says whether a legacy keyboard controller is present.
 752          * The FADT also contains an SCI_INT line, by which the system
 753          * gets interrupts such as power and sleep buttons.  If it's not
 754          * on a Legacy interrupt, it needs to be setup.
 755          */
 756         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
 757                 printk(KERN_ERR PREFIX "Can't find FADT\n");
 758
 759 #ifdef CONFIG_ACPI_NUMA
 760 #ifdef CONFIG_SMP
 761         if (srat_num_cpus == 0) {
 762                 int cpu, i = 1;
 763                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
 764                         if (smp_boot_data.cpu_phys_id[cpu] !=
 765                             hard_smp_processor_id())
 766                                 node_cpuid[i++].phys_id =
 767                                     smp_boot_data.cpu_phys_id[cpu];
 768         }
 769 #endif
 770         build_cpu_to_node_map();
 771 #endif
 772         return 0;
 773 }
 774
 775 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
 776 {
 777         int tmp;
 778
 779         if (has_8259 && gsi < 16)
 780                 *irq = isa_irq_to_vector(gsi);
 781         else {
 782                 tmp = gsi_to_irq(gsi);
 783                 if (tmp == -1)
 784                         return -1;
 785                 *irq = tmp;
 786         }
 787         return 0;
 788 }
 789
 790 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
 791 {
 792         if (isa_irq >= 16)
 793                 return -1;
 794         *gsi = isa_irq;
 795         return 0;
 796 }
 797
 798 /*
 799  *  ACPI based hotplug CPU support
 800  */
 801 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 802 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
 803 {
 804 #ifdef CONFIG_ACPI_NUMA
 805         /*
 806          * We don't have cpu-only-node hotadd. But if the system equips
 807          * SRAT table, pxm is already found and node is ready.
 808          * So, just pxm_to_nid(pxm) is OK.
 809          * This code here is for the system which doesn't have full SRAT
 810          * table for possible cpus.
 811          */
 812         node_cpuid[cpu].phys_id = physid;
 813         node_cpuid[cpu].nid = acpi_get_node(handle);
 814 #endif
 815         return 0;
 816 }
 817
 818 int additional_cpus __initdata = -1;
 819
 820 static __init int setup_additional_cpus(char *s)
 821 {
 822         if (s)
 823                 additional_cpus = simple_strtol(s, NULL, 0);
 824
 825         return 0;
 826 }
 827
 828 early_param("additional_cpus", setup_additional_cpus);
 829
 830 /*
 831  * cpu_possible_mask should be static, it cannot change as CPUs
 832  * are onlined, or offlined. The reason is per-cpu data-structures
 833  * are allocated by some modules at init time, and dont expect to
 834  * do this dynamically on cpu arrival/departure.
 835  * cpu_present_mask on the other hand can change dynamically.
 836  * In case when cpu_hotplug is not compiled, then we resort to current
 837  * behaviour, which is cpu_possible == cpu_present.
 838  * - Ashok Raj
 839  *
 840  * Three ways to find out the number of additional hotplug CPUs:
 841  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
 842  * - The user can overwrite it with additional_cpus=NUM
 843  * - Otherwise don't reserve additional CPUs.
 844  */
 845 __init void prefill_possible_map(void)
 846 {
 847         int i;
 848         int possible, disabled_cpus;
 849
 850         disabled_cpus = total_cpus - available_cpus;
 851
 852         if (additional_cpus == -1) {
 853                 if (disabled_cpus > 0)
 854                         additional_cpus = disabled_cpus;
 855                 else
 856                         additional_cpus = 0;
 857         }
 858
 859         possible = available_cpus + additional_cpus;
 860
 861         if (possible > nr_cpu_ids)
 862                 possible = nr_cpu_ids;
 863
 864         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
 865                 possible, max((possible - available_cpus), 0));
 866
 867         for (i = 0; i < possible; i++)
 868                 set_cpu_possible(i, true);
 869 }
 870
 871 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
 872 {
 873         cpumask_t tmp_map;
 874         int cpu;
 875
 876         cpumask_complement(&tmp_map, cpu_present_mask);
 877         cpu = cpumask_first(&tmp_map);
 878         if (cpu >= nr_cpu_ids)
 879                 return -EINVAL;
 880
 881         acpi_map_cpu2node(handle, cpu, physid);
 882
 883         set_cpu_present(cpu, true);
 884         ia64_cpu_to_sapicid[cpu] = physid;
 885
 886         acpi_processor_set_pdc(handle);
 887
 888         *pcpu = cpu;
 889         return (0);
 890 }
 891
 892 /* wrapper to silence section mismatch warning */
 893 int __ref acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
 894 {
 895         return _acpi_map_lsapic(handle, physid, pcpu);
 896 }
 897 EXPORT_SYMBOL(acpi_map_lsapic);
 898
 899 int acpi_unmap_lsapic(int cpu)
 900 {
 901         ia64_cpu_to_sapicid[cpu] = -1;
 902         set_cpu_present(cpu, false);
 903
 904 #ifdef CONFIG_ACPI_NUMA
 905         /* NUMA specific cleanup's */
 906 #endif
 907
 908         return (0);
 909 }
 910
 911 EXPORT_SYMBOL(acpi_unmap_lsapic);
 912 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
 913
 914 #ifdef CONFIG_ACPI_NUMA
 915 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
 916                                     void *context, void **ret)
 917 {
 918         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 919         union acpi_object *obj;
 920         struct acpi_madt_io_sapic *iosapic;
 921         unsigned int gsi_base;
 922         int node;
 923
 924         /* Only care about objects w/ a method that returns the MADT */
 925         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 926                 return AE_OK;
 927
 928         if (!buffer.length || !buffer.pointer)
 929                 return AE_OK;
 930
 931         obj = buffer.pointer;
 932         if (obj->type != ACPI_TYPE_BUFFER ||
 933             obj->buffer.length < sizeof(*iosapic)) {
 934                 kfree(buffer.pointer);
 935                 return AE_OK;
 936         }
 937
 938         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
 939
 940         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
 941                 kfree(buffer.pointer);
 942                 return AE_OK;
 943         }
 944
 945         gsi_base = iosapic->global_irq_base;
 946
 947         kfree(buffer.pointer);
 948
 949         /* OK, it's an IOSAPIC MADT entry; associate it with a node */
 950         node = acpi_get_node(handle);
 951         if (node == NUMA_NO_NODE || !node_online(node) ||
 952             cpumask_empty(cpumask_of_node(node)))
 953                 return AE_OK;
 954
 955         /* We know a gsi to node mapping! */
 956         map_iosapic_to_node(gsi_base, node);
 957         return AE_OK;
 958 }
 959
 960 static int __init
 961 acpi_map_iosapics (void)
 962 {
 963         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
 964         return 0;
 965 }
 966
 967 fs_initcall(acpi_map_iosapics);
 968 #endif                          /* CONFIG_ACPI_NUMA */
 969
 970 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
 971 {
 972         int err;
 973
 974         if ((err = iosapic_init(phys_addr, gsi_base)))
 975                 return err;
 976
 977 #ifdef CONFIG_ACPI_NUMA
 978         acpi_map_iosapic(handle, 0, NULL, NULL);
 979 #endif                          /* CONFIG_ACPI_NUMA */
 980
 981         return 0;
 982 }
 983
 984 EXPORT_SYMBOL(acpi_register_ioapic);
 985
 986 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
 987 {
 988         return iosapic_remove(gsi_base);
 989 }
 990
 991 EXPORT_SYMBOL(acpi_unregister_ioapic);
 992
 993 /*
 994  * acpi_suspend_lowlevel() - save kernel state and suspend.
 995  *
 996  * TBD when when IA64 starts to support suspend...
 997  */
 998 int acpi_suspend_lowlevel(void) { return 0; }