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 phys_cpuid_t rv; 158 159 acpi_get_table(ACPI_SIG_MADT, 0, 160 (struct acpi_table_header **)&madt); 161 if (!madt) 162 return PHYS_CPUID_INVALID; 163 164 rv = map_madt_entry(madt, 1, acpi_id, true); 165 166 acpi_put_table((struct acpi_table_header *)madt); 167 168 return rv; 169 } 170 171 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id, 172 bool ignore_disabled) 173 { 174 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 175 union acpi_object *obj; 176 struct acpi_subtable_header *header; 177 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; 178 179 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 180 goto exit; 181 182 if (!buffer.length || !buffer.pointer) 183 goto exit; 184 185 obj = buffer.pointer; 186 if (obj->type != ACPI_TYPE_BUFFER || 187 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 188 goto exit; 189 } 190 191 header = (struct acpi_subtable_header *)obj->buffer.pointer; 192 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) 193 map_lapic_id(header, acpi_id, &phys_id, ignore_disabled); 194 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) 195 map_lsapic_id(header, type, acpi_id, &phys_id, ignore_disabled); 196 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) 197 map_x2apic_id(header, type, acpi_id, &phys_id, ignore_disabled); 198 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) 199 map_gicc_mpidr(header, type, acpi_id, &phys_id, 200 ignore_disabled); 201 202 exit: 203 kfree(buffer.pointer); 204 return phys_id; 205 } 206 207 static phys_cpuid_t __acpi_get_phys_id(acpi_handle handle, int type, 208 u32 acpi_id, bool ignore_disabled) 209 { 210 phys_cpuid_t phys_id; 211 212 phys_id = map_mat_entry(handle, type, acpi_id, ignore_disabled); 213 if (invalid_phys_cpuid(phys_id)) 214 phys_id = map_madt_entry(get_madt_table(), type, acpi_id, 215 ignore_disabled); 216 217 return phys_id; 218 } 219 220 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) 221 { 222 return __acpi_get_phys_id(handle, type, acpi_id, true); 223 } 224 225 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id) 226 { 227 #ifdef CONFIG_SMP 228 int i; 229 #endif 230 231 if (invalid_phys_cpuid(phys_id)) { 232 /* 233 * On UP processor, there is no _MAT or MADT table. 234 * So above phys_id is always set to PHYS_CPUID_INVALID. 235 * 236 * BIOS may define multiple CPU handles even for UP processor. 237 * For example, 238 * 239 * Scope (_PR) 240 * { 241 * Processor (CPU0, 0x00, 0x00000410, 0x06) {} 242 * Processor (CPU1, 0x01, 0x00000410, 0x06) {} 243 * Processor (CPU2, 0x02, 0x00000410, 0x06) {} 244 * Processor (CPU3, 0x03, 0x00000410, 0x06) {} 245 * } 246 * 247 * Ignores phys_id and always returns 0 for the processor 248 * handle with acpi id 0 if nr_cpu_ids is 1. 249 * This should be the case if SMP tables are not found. 250 * Return -EINVAL for other CPU's handle. 251 */ 252 if (nr_cpu_ids <= 1 && acpi_id == 0) 253 return acpi_id; 254 else 255 return -EINVAL; 256 } 257 258 #ifdef CONFIG_SMP 259 for_each_possible_cpu(i) { 260 if (cpu_physical_id(i) == phys_id) 261 return i; 262 } 263 #else 264 /* In UP kernel, only processor 0 is valid */ 265 if (phys_id == 0) 266 return phys_id; 267 #endif 268 return -ENODEV; 269 } 270 271 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) 272 { 273 phys_cpuid_t phys_id; 274 275 phys_id = acpi_get_phys_id(handle, type, acpi_id); 276 277 return acpi_map_cpuid(phys_id, acpi_id); 278 } 279 EXPORT_SYMBOL_GPL(acpi_get_cpuid); 280 281 #ifdef CONFIG_ACPI_HOTPLUG_CPU 282 static bool __init 283 map_processor(acpi_handle handle, phys_cpuid_t *phys_id, int *cpuid) 284 { 285 int type, id; 286 u32 acpi_id; 287 acpi_status status; 288 acpi_object_type acpi_type; 289 unsigned long long tmp; 290 union acpi_object object = { 0 }; 291 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 292 293 status = acpi_get_type(handle, &acpi_type); 294 if (ACPI_FAILURE(status)) 295 return false; 296 297 switch (acpi_type) { 298 case ACPI_TYPE_PROCESSOR: 299 status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 300 if (ACPI_FAILURE(status)) 301 return false; 302 acpi_id = object.processor.proc_id; 303 304 /* validate the acpi_id */ 305 if(acpi_processor_validate_proc_id(acpi_id)) 306 return false; 307 break; 308 case ACPI_TYPE_DEVICE: 309 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); 310 if (ACPI_FAILURE(status)) 311 return false; 312 acpi_id = tmp; 313 break; 314 default: 315 return false; 316 } 317 318 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; 319 320 *phys_id = __acpi_get_phys_id(handle, type, acpi_id, false); 321 id = acpi_map_cpuid(*phys_id, acpi_id); 322 323 if (id < 0) 324 return false; 325 *cpuid = id; 326 return true; 327 } 328 329 static acpi_status __init 330 set_processor_node_mapping(acpi_handle handle, u32 lvl, void *context, 331 void **rv) 332 { 333 phys_cpuid_t phys_id; 334 int cpu_id; 335 336 if (!map_processor(handle, &phys_id, &cpu_id)) 337 return AE_ERROR; 338 339 acpi_map_cpu2node(handle, cpu_id, phys_id); 340 return AE_OK; 341 } 342 343 void __init acpi_set_processor_mapping(void) 344 { 345 /* Set persistent cpu <-> node mapping for all processors. */ 346 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 347 ACPI_UINT32_MAX, set_processor_node_mapping, 348 NULL, NULL, NULL); 349 } 350 #else 351 void __init acpi_set_processor_mapping(void) {} 352 #endif /* CONFIG_ACPI_HOTPLUG_CPU */ 353 354 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC 355 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, 356 u64 *phys_addr, int *ioapic_id) 357 { 358 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; 359 360 if (ioapic->global_irq_base != gsi_base) 361 return 0; 362 363 *phys_addr = ioapic->address; 364 *ioapic_id = ioapic->id; 365 return 1; 366 } 367 368 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) 369 { 370 struct acpi_subtable_header *hdr; 371 unsigned long madt_end, entry; 372 struct acpi_table_madt *madt; 373 int apic_id = -1; 374 375 madt = get_madt_table(); 376 if (!madt) 377 return apic_id; 378 379 entry = (unsigned long)madt; 380 madt_end = entry + madt->header.length; 381 382 /* Parse all entries looking for a match. */ 383 entry += sizeof(struct acpi_table_madt); 384 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 385 hdr = (struct acpi_subtable_header *)entry; 386 if (hdr->type == ACPI_MADT_TYPE_IO_APIC && 387 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) 388 break; 389 else 390 entry += hdr->length; 391 } 392 393 return apic_id; 394 } 395 396 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, 397 u64 *phys_addr) 398 { 399 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 400 struct acpi_subtable_header *header; 401 union acpi_object *obj; 402 int apic_id = -1; 403 404 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 405 goto exit; 406 407 if (!buffer.length || !buffer.pointer) 408 goto exit; 409 410 obj = buffer.pointer; 411 if (obj->type != ACPI_TYPE_BUFFER || 412 obj->buffer.length < sizeof(struct acpi_subtable_header)) 413 goto exit; 414 415 header = (struct acpi_subtable_header *)obj->buffer.pointer; 416 if (header->type == ACPI_MADT_TYPE_IO_APIC) 417 get_ioapic_id(header, gsi_base, phys_addr, &apic_id); 418 419 exit: 420 kfree(buffer.pointer); 421 return apic_id; 422 } 423 424 /** 425 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base 426 * @handle: ACPI object for IOAPIC device 427 * @gsi_base: GSI base to match with 428 * @phys_addr: Pointer to store physical address of matching IOAPIC record 429 * 430 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search 431 * for an ACPI IOAPIC record matching @gsi_base. 432 * Return IOAPIC id and store physical address in @phys_addr if found a match, 433 * otherwise return <0. 434 */ 435 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr) 436 { 437 int apic_id; 438 439 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr); 440 if (apic_id == -1) 441 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); 442 443 return apic_id; 444 } 445 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */ 446