drivers/acpi/processor_core.c

   1 /*
   2  * Copyright (C) 2005 Intel Corporation
   3  * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
   4  *
   5  *      Alex Chiang <achiang@hp.com>
   6  *      - Unified x86/ia64 implementations
   7  *
   8  * I/O APIC hotplug support
   9  *      Yinghai Lu <yinghai@kernel.org>
  10  *      Jiang Liu <jiang.liu@intel.com>
  11  */
  12 #include <linux/export.h>
  13 #include <linux/acpi.h>
  14 #include <acpi/processor.h>
  15
  16 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  17 ACPI_MODULE_NAME("processor_core");
  18
  19 static struct acpi_table_madt *get_madt_table(void)
  20 {
  21         static struct acpi_table_madt *madt;
  22         static int read_madt;
  23
  24         if (!read_madt) {
  25                 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
  26                                         (struct acpi_table_header **)&madt)))
  27                         madt = NULL;
  28                 read_madt++;
  29         }
  30
  31         return madt;
  32 }
  33
  34 static int map_lapic_id(struct acpi_subtable_header *entry,
  35                  u32 acpi_id, phys_cpuid_t *apic_id, bool ignore_disabled)
  36 {
  37         struct acpi_madt_local_apic *lapic =
  38                 container_of(entry, struct acpi_madt_local_apic, header);
  39
  40         if (ignore_disabled && !(lapic->lapic_flags & ACPI_MADT_ENABLED))
  41                 return -ENODEV;
  42
  43         if (lapic->processor_id != acpi_id)
  44                 return -EINVAL;
  45
  46         *apic_id = lapic->id;
  47         return 0;
  48 }
  49
  50 static int map_x2apic_id(struct acpi_subtable_header *entry,
  51                 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id,
  52                 bool ignore_disabled)
  53 {
  54         struct acpi_madt_local_x2apic *apic =
  55                 container_of(entry, struct acpi_madt_local_x2apic, header);
  56
  57         if (ignore_disabled && !(apic->lapic_flags & ACPI_MADT_ENABLED))
  58                 return -ENODEV;
  59
  60         if (device_declaration && (apic->uid == acpi_id)) {
  61                 *apic_id = apic->local_apic_id;
  62                 return 0;
  63         }
  64
  65         return -EINVAL;
  66 }
  67
  68 static int map_lsapic_id(struct acpi_subtable_header *entry,
  69                 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id,
  70                 bool ignore_disabled)
  71 {
  72         struct acpi_madt_local_sapic *lsapic =
  73                 container_of(entry, struct acpi_madt_local_sapic, header);
  74
  75         if (ignore_disabled && !(lsapic->lapic_flags & ACPI_MADT_ENABLED))
  76                 return -ENODEV;
  77
  78         if (device_declaration) {
  79                 if ((entry->length < 16) || (lsapic->uid != acpi_id))
  80                         return -EINVAL;
  81         } else if (lsapic->processor_id != acpi_id)
  82                 return -EINVAL;
  83
  84         *apic_id = (lsapic->id << 8) | lsapic->eid;
  85         return 0;
  86 }
  87
  88 /*
  89  * Retrieve the ARM CPU physical identifier (MPIDR)
  90  */
  91 static int map_gicc_mpidr(struct acpi_subtable_header *entry,
  92                 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr,
  93                 bool ignore_disabled)
  94 {
  95         struct acpi_madt_generic_interrupt *gicc =
  96             container_of(entry, struct acpi_madt_generic_interrupt, header);
  97
  98         if (ignore_disabled && !(gicc->flags & ACPI_MADT_ENABLED))
  99                 return -ENODEV;
 100
 101         /* device_declaration means Device object in DSDT, in the
 102          * GIC interrupt model, logical processors are required to
 103          * have a Processor Device object in the DSDT, so we should
 104          * check device_declaration here
 105          */
 106         if (device_declaration && (gicc->uid == acpi_id)) {
 107                 *mpidr = gicc->arm_mpidr;
 108                 return 0;
 109         }
 110
 111         return -EINVAL;
 112 }
 113
 114 static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
 115                                    int type, u32 acpi_id, bool ignore_disabled)
 116 {
 117         unsigned long madt_end, entry;
 118         phys_cpuid_t phys_id = PHYS_CPUID_INVALID;      /* CPU hardware ID */
 119
 120         if (!madt)
 121                 return phys_id;
 122
 123         entry = (unsigned long)madt;
 124         madt_end = entry + madt->header.length;
 125
 126         /* Parse all entries looking for a match. */
 127
 128         entry += sizeof(struct acpi_table_madt);
 129         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 130                 struct acpi_subtable_header *header =
 131                         (struct acpi_subtable_header *)entry;
 132                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 133                         if (!map_lapic_id(header, acpi_id, &phys_id,
 134                                           ignore_disabled))
 135                                 break;
 136                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 137                         if (!map_x2apic_id(header, type, acpi_id, &phys_id,
 138                                            ignore_disabled))
 139                                 break;
 140                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 141                         if (!map_lsapic_id(header, type, acpi_id, &phys_id,
 142                                            ignore_disabled))
 143                                 break;
 144                 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
 145                         if (!map_gicc_mpidr(header, type, acpi_id, &phys_id,
 146                                             ignore_disabled))
 147                                 break;
 148                 }
 149                 entry += header->length;
 150         }
 151         return phys_id;
 152 }
 153
 154 phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
 155 {
 156         struct acpi_table_madt *madt = NULL;
 157         acpi_size tbl_size;
 158         phys_cpuid_t rv;
 159
 160         acpi_get_table_with_size(ACPI_SIG_MADT, 0,
 161                                  (struct acpi_table_header **)&madt,
 162                                  &tbl_size);
 163         if (!madt)
 164                 return PHYS_CPUID_INVALID;
 165
 166         rv = map_madt_entry(madt, 1, acpi_id, true);
 167
 168         early_acpi_os_unmap_memory(madt, tbl_size);
 169
 170         return rv;
 171 }
 172
 173 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id,
 174                                   bool ignore_disabled)
 175 {
 176         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 177         union acpi_object *obj;
 178         struct acpi_subtable_header *header;
 179         phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
 180
 181         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 182                 goto exit;
 183
 184         if (!buffer.length || !buffer.pointer)
 185                 goto exit;
 186
 187         obj = buffer.pointer;
 188         if (obj->type != ACPI_TYPE_BUFFER ||
 189             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 190                 goto exit;
 191         }
 192
 193         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 194         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
 195                 map_lapic_id(header, acpi_id, &phys_id, ignore_disabled);
 196         else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
 197                 map_lsapic_id(header, type, acpi_id, &phys_id, ignore_disabled);
 198         else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
 199                 map_x2apic_id(header, type, acpi_id, &phys_id, ignore_disabled);
 200         else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
 201                 map_gicc_mpidr(header, type, acpi_id, &phys_id,
 202                                ignore_disabled);
 203
 204 exit:
 205         kfree(buffer.pointer);
 206         return phys_id;
 207 }
 208
 209 static phys_cpuid_t __acpi_get_phys_id(acpi_handle handle, int type,
 210                                        u32 acpi_id, bool ignore_disabled)
 211 {
 212         phys_cpuid_t phys_id;
 213
 214         phys_id = map_mat_entry(handle, type, acpi_id, ignore_disabled);
 215         if (invalid_phys_cpuid(phys_id))
 216                 phys_id = map_madt_entry(get_madt_table(), type, acpi_id,
 217                                            ignore_disabled);
 218
 219         return phys_id;
 220 }
 221
 222 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
 223 {
 224         return __acpi_get_phys_id(handle, type, acpi_id, true);
 225 }
 226
 227 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
 228 {
 229 #ifdef CONFIG_SMP
 230         int i;
 231 #endif
 232
 233         if (invalid_phys_cpuid(phys_id)) {
 234                 /*
 235                  * On UP processor, there is no _MAT or MADT table.
 236                  * So above phys_id is always set to PHYS_CPUID_INVALID.
 237                  *
 238                  * BIOS may define multiple CPU handles even for UP processor.
 239                  * For example,
 240                  *
 241                  * Scope (_PR)
 242                  * {
 243                  *     Processor (CPU0, 0x00, 0x00000410, 0x06) {}
 244                  *     Processor (CPU1, 0x01, 0x00000410, 0x06) {}
 245                  *     Processor (CPU2, 0x02, 0x00000410, 0x06) {}
 246                  *     Processor (CPU3, 0x03, 0x00000410, 0x06) {}
 247                  * }
 248                  *
 249                  * Ignores phys_id and always returns 0 for the processor
 250                  * handle with acpi id 0 if nr_cpu_ids is 1.
 251                  * This should be the case if SMP tables are not found.
 252                  * Return -EINVAL for other CPU's handle.
 253                  */
 254                 if (nr_cpu_ids <= 1 && acpi_id == 0)
 255                         return acpi_id;
 256                 else
 257                         return -EINVAL;
 258         }
 259
 260 #ifdef CONFIG_SMP
 261         for_each_possible_cpu(i) {
 262                 if (cpu_physical_id(i) == phys_id)
 263                         return i;
 264         }
 265 #else
 266         /* In UP kernel, only processor 0 is valid */
 267         if (phys_id == 0)
 268                 return phys_id;
 269 #endif
 270         return -ENODEV;
 271 }
 272
 273 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 274 {
 275         phys_cpuid_t phys_id;
 276
 277         phys_id = acpi_get_phys_id(handle, type, acpi_id);
 278
 279         return acpi_map_cpuid(phys_id, acpi_id);
 280 }
 281 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 282
 283 #ifdef CONFIG_ACPI_HOTPLUG_CPU
 284 static bool __init
 285 map_processor(acpi_handle handle, phys_cpuid_t *phys_id, int *cpuid)
 286 {
 287         int type, id;
 288         u32 acpi_id;
 289         acpi_status status;
 290         acpi_object_type acpi_type;
 291         unsigned long long tmp;
 292         union acpi_object object = { 0 };
 293         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 294
 295         status = acpi_get_type(handle, &acpi_type);
 296         if (ACPI_FAILURE(status))
 297                 return false;
 298
 299         switch (acpi_type) {
 300         case ACPI_TYPE_PROCESSOR:
 301                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
 302                 if (ACPI_FAILURE(status))
 303                         return false;
 304                 acpi_id = object.processor.proc_id;
 305
 306                 /* validate the acpi_id */
 307                 if(acpi_processor_validate_proc_id(acpi_id))
 308                         return false;
 309                 break;
 310         case ACPI_TYPE_DEVICE:
 311                 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
 312                 if (ACPI_FAILURE(status))
 313                         return false;
 314                 acpi_id = tmp;
 315                 break;
 316         default:
 317                 return false;
 318         }
 319
 320         type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
 321
 322         *phys_id = __acpi_get_phys_id(handle, type, acpi_id, false);
 323         id = acpi_map_cpuid(*phys_id, acpi_id);
 324
 325         if (id < 0)
 326                 return false;
 327         *cpuid = id;
 328         return true;
 329 }
 330
 331 static acpi_status __init
 332 set_processor_node_mapping(acpi_handle handle, u32 lvl, void *context,
 333                            void **rv)
 334 {
 335         phys_cpuid_t phys_id;
 336         int cpu_id;
 337
 338         if (!map_processor(handle, &phys_id, &cpu_id))
 339                 return AE_ERROR;
 340
 341         acpi_map_cpu2node(handle, cpu_id, phys_id);
 342         return AE_OK;
 343 }
 344
 345 void __init acpi_set_processor_mapping(void)
 346 {
 347         /* Set persistent cpu <-> node mapping for all processors. */
 348         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 349                             ACPI_UINT32_MAX, set_processor_node_mapping,
 350                             NULL, NULL, NULL);
 351 }
 352 #else
 353 void __init acpi_set_processor_mapping(void) {}
 354 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
 355
 356 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 357 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
 358                          u64 *phys_addr, int *ioapic_id)
 359 {
 360         struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
 361
 362         if (ioapic->global_irq_base != gsi_base)
 363                 return 0;
 364
 365         *phys_addr = ioapic->address;
 366         *ioapic_id = ioapic->id;
 367         return 1;
 368 }
 369
 370 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
 371 {
 372         struct acpi_subtable_header *hdr;
 373         unsigned long madt_end, entry;
 374         struct acpi_table_madt *madt;
 375         int apic_id = -1;
 376
 377         madt = get_madt_table();
 378         if (!madt)
 379                 return apic_id;
 380
 381         entry = (unsigned long)madt;
 382         madt_end = entry + madt->header.length;
 383
 384         /* Parse all entries looking for a match. */
 385         entry += sizeof(struct acpi_table_madt);
 386         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 387                 hdr = (struct acpi_subtable_header *)entry;
 388                 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
 389                     get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
 390                         break;
 391                 else
 392                         entry += hdr->length;
 393         }
 394
 395         return apic_id;
 396 }
 397
 398 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
 399                                   u64 *phys_addr)
 400 {
 401         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 402         struct acpi_subtable_header *header;
 403         union acpi_object *obj;
 404         int apic_id = -1;
 405
 406         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 407                 goto exit;
 408
 409         if (!buffer.length || !buffer.pointer)
 410                 goto exit;
 411
 412         obj = buffer.pointer;
 413         if (obj->type != ACPI_TYPE_BUFFER ||
 414             obj->buffer.length < sizeof(struct acpi_subtable_header))
 415                 goto exit;
 416
 417         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 418         if (header->type == ACPI_MADT_TYPE_IO_APIC)
 419                 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
 420
 421 exit:
 422         kfree(buffer.pointer);
 423         return apic_id;
 424 }
 425
 426 /**
 427  * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
 428  * @handle:     ACPI object for IOAPIC device
 429  * @gsi_base:   GSI base to match with
 430  * @phys_addr:  Pointer to store physical address of matching IOAPIC record
 431  *
 432  * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
 433  * for an ACPI IOAPIC record matching @gsi_base.
 434  * Return IOAPIC id and store physical address in @phys_addr if found a match,
 435  * otherwise return <0.
 436  */
 437 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
 438 {
 439         int apic_id;
 440
 441         apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
 442         if (apic_id == -1)
 443                 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
 444
 445         return apic_id;
 446 }
 447 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */