1 /* 2 * Copyright (C) 2005 Intel Corporation 3 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. 4 * 5 * Alex Chiang <[email protected]> 6 * - Unified x86/ia64 implementations 7 * 8 * I/O APIC hotplug support 9 * Yinghai Lu <[email protected]> 10 * Jiang Liu <[email protected]> 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_IOAPIC 284 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, 285 u64 *phys_addr, int *ioapic_id) 286 { 287 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; 288 289 if (ioapic->global_irq_base != gsi_base) 290 return 0; 291 292 *phys_addr = ioapic->address; 293 *ioapic_id = ioapic->id; 294 return 1; 295 } 296 297 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) 298 { 299 struct acpi_subtable_header *hdr; 300 unsigned long madt_end, entry; 301 struct acpi_table_madt *madt; 302 int apic_id = -1; 303 304 madt = get_madt_table(); 305 if (!madt) 306 return apic_id; 307 308 entry = (unsigned long)madt; 309 madt_end = entry + madt->header.length; 310 311 /* Parse all entries looking for a match. */ 312 entry += sizeof(struct acpi_table_madt); 313 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 314 hdr = (struct acpi_subtable_header *)entry; 315 if (hdr->type == ACPI_MADT_TYPE_IO_APIC && 316 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) 317 break; 318 else 319 entry += hdr->length; 320 } 321 322 return apic_id; 323 } 324 325 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, 326 u64 *phys_addr) 327 { 328 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 329 struct acpi_subtable_header *header; 330 union acpi_object *obj; 331 int apic_id = -1; 332 333 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 334 goto exit; 335 336 if (!buffer.length || !buffer.pointer) 337 goto exit; 338 339 obj = buffer.pointer; 340 if (obj->type != ACPI_TYPE_BUFFER || 341 obj->buffer.length < sizeof(struct acpi_subtable_header)) 342 goto exit; 343 344 header = (struct acpi_subtable_header *)obj->buffer.pointer; 345 if (header->type == ACPI_MADT_TYPE_IO_APIC) 346 get_ioapic_id(header, gsi_base, phys_addr, &apic_id); 347 348 exit: 349 kfree(buffer.pointer); 350 return apic_id; 351 } 352 353 /** 354 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base 355 * @handle: ACPI object for IOAPIC device 356 * @gsi_base: GSI base to match with 357 * @phys_addr: Pointer to store physical address of matching IOAPIC record 358 * 359 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search 360 * for an ACPI IOAPIC record matching @gsi_base. 361 * Return IOAPIC id and store physical address in @phys_addr if found a match, 362 * otherwise return <0. 363 */ 364 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr) 365 { 366 int apic_id; 367 368 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr); 369 if (apic_id == -1) 370 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); 371 372 return apic_id; 373 } 374 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */ 375