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) 36 { 37 struct acpi_madt_local_apic *lapic = 38 container_of(entry, struct acpi_madt_local_apic, header); 39 40 if (!(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 { 53 struct acpi_madt_local_x2apic *apic = 54 container_of(entry, struct acpi_madt_local_x2apic, header); 55 56 if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) 57 return -ENODEV; 58 59 if (device_declaration && (apic->uid == acpi_id)) { 60 *apic_id = apic->local_apic_id; 61 return 0; 62 } 63 64 return -EINVAL; 65 } 66 67 static int map_lsapic_id(struct acpi_subtable_header *entry, 68 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) 69 { 70 struct acpi_madt_local_sapic *lsapic = 71 container_of(entry, struct acpi_madt_local_sapic, header); 72 73 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) 74 return -ENODEV; 75 76 if (device_declaration) { 77 if ((entry->length < 16) || (lsapic->uid != acpi_id)) 78 return -EINVAL; 79 } else if (lsapic->processor_id != acpi_id) 80 return -EINVAL; 81 82 *apic_id = (lsapic->id << 8) | lsapic->eid; 83 return 0; 84 } 85 86 /* 87 * Retrieve the ARM CPU physical identifier (MPIDR) 88 */ 89 static int map_gicc_mpidr(struct acpi_subtable_header *entry, 90 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr) 91 { 92 struct acpi_madt_generic_interrupt *gicc = 93 container_of(entry, struct acpi_madt_generic_interrupt, header); 94 95 if (!(gicc->flags & ACPI_MADT_ENABLED)) 96 return -ENODEV; 97 98 /* device_declaration means Device object in DSDT, in the 99 * GIC interrupt model, logical processors are required to 100 * have a Processor Device object in the DSDT, so we should 101 * check device_declaration here 102 */ 103 if (device_declaration && (gicc->uid == acpi_id)) { 104 *mpidr = gicc->arm_mpidr; 105 return 0; 106 } 107 108 return -EINVAL; 109 } 110 111 static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, 112 int type, u32 acpi_id) 113 { 114 unsigned long madt_end, entry; 115 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */ 116 117 if (!madt) 118 return phys_id; 119 120 entry = (unsigned long)madt; 121 madt_end = entry + madt->header.length; 122 123 /* Parse all entries looking for a match. */ 124 125 entry += sizeof(struct acpi_table_madt); 126 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 127 struct acpi_subtable_header *header = 128 (struct acpi_subtable_header *)entry; 129 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 130 if (!map_lapic_id(header, acpi_id, &phys_id)) 131 break; 132 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { 133 if (!map_x2apic_id(header, type, acpi_id, &phys_id)) 134 break; 135 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 136 if (!map_lsapic_id(header, type, acpi_id, &phys_id)) 137 break; 138 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { 139 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id)) 140 break; 141 } 142 entry += header->length; 143 } 144 return phys_id; 145 } 146 147 phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id) 148 { 149 struct acpi_table_madt *madt = NULL; 150 phys_cpuid_t rv; 151 152 acpi_get_table(ACPI_SIG_MADT, 0, 153 (struct acpi_table_header **)&madt); 154 if (!madt) 155 return PHYS_CPUID_INVALID; 156 157 rv = map_madt_entry(madt, 1, acpi_id); 158 159 acpi_put_table((struct acpi_table_header *)madt); 160 161 return rv; 162 } 163 164 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 165 { 166 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 167 union acpi_object *obj; 168 struct acpi_subtable_header *header; 169 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; 170 171 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 172 goto exit; 173 174 if (!buffer.length || !buffer.pointer) 175 goto exit; 176 177 obj = buffer.pointer; 178 if (obj->type != ACPI_TYPE_BUFFER || 179 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 180 goto exit; 181 } 182 183 header = (struct acpi_subtable_header *)obj->buffer.pointer; 184 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) 185 map_lapic_id(header, acpi_id, &phys_id); 186 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) 187 map_lsapic_id(header, type, acpi_id, &phys_id); 188 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) 189 map_x2apic_id(header, type, acpi_id, &phys_id); 190 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) 191 map_gicc_mpidr(header, type, acpi_id, &phys_id); 192 193 exit: 194 kfree(buffer.pointer); 195 return phys_id; 196 } 197 198 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) 199 { 200 phys_cpuid_t phys_id; 201 202 phys_id = map_mat_entry(handle, type, acpi_id); 203 if (invalid_phys_cpuid(phys_id)) 204 phys_id = map_madt_entry(get_madt_table(), type, acpi_id); 205 206 return phys_id; 207 } 208 209 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id) 210 { 211 #ifdef CONFIG_SMP 212 int i; 213 #endif 214 215 if (invalid_phys_cpuid(phys_id)) { 216 /* 217 * On UP processor, there is no _MAT or MADT table. 218 * So above phys_id is always set to PHYS_CPUID_INVALID. 219 * 220 * BIOS may define multiple CPU handles even for UP processor. 221 * For example, 222 * 223 * Scope (_PR) 224 * { 225 * Processor (CPU0, 0x00, 0x00000410, 0x06) {} 226 * Processor (CPU1, 0x01, 0x00000410, 0x06) {} 227 * Processor (CPU2, 0x02, 0x00000410, 0x06) {} 228 * Processor (CPU3, 0x03, 0x00000410, 0x06) {} 229 * } 230 * 231 * Ignores phys_id and always returns 0 for the processor 232 * handle with acpi id 0 if nr_cpu_ids is 1. 233 * This should be the case if SMP tables are not found. 234 * Return -EINVAL for other CPU's handle. 235 */ 236 if (nr_cpu_ids <= 1 && acpi_id == 0) 237 return acpi_id; 238 else 239 return -EINVAL; 240 } 241 242 #ifdef CONFIG_SMP 243 for_each_possible_cpu(i) { 244 if (cpu_physical_id(i) == phys_id) 245 return i; 246 } 247 #else 248 /* In UP kernel, only processor 0 is valid */ 249 if (phys_id == 0) 250 return phys_id; 251 #endif 252 return -ENODEV; 253 } 254 255 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) 256 { 257 phys_cpuid_t phys_id; 258 259 phys_id = acpi_get_phys_id(handle, type, acpi_id); 260 261 return acpi_map_cpuid(phys_id, acpi_id); 262 } 263 EXPORT_SYMBOL_GPL(acpi_get_cpuid); 264 265 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC 266 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, 267 u64 *phys_addr, int *ioapic_id) 268 { 269 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; 270 271 if (ioapic->global_irq_base != gsi_base) 272 return 0; 273 274 *phys_addr = ioapic->address; 275 *ioapic_id = ioapic->id; 276 return 1; 277 } 278 279 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) 280 { 281 struct acpi_subtable_header *hdr; 282 unsigned long madt_end, entry; 283 struct acpi_table_madt *madt; 284 int apic_id = -1; 285 286 madt = get_madt_table(); 287 if (!madt) 288 return apic_id; 289 290 entry = (unsigned long)madt; 291 madt_end = entry + madt->header.length; 292 293 /* Parse all entries looking for a match. */ 294 entry += sizeof(struct acpi_table_madt); 295 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 296 hdr = (struct acpi_subtable_header *)entry; 297 if (hdr->type == ACPI_MADT_TYPE_IO_APIC && 298 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) 299 break; 300 else 301 entry += hdr->length; 302 } 303 304 return apic_id; 305 } 306 307 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, 308 u64 *phys_addr) 309 { 310 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 311 struct acpi_subtable_header *header; 312 union acpi_object *obj; 313 int apic_id = -1; 314 315 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 316 goto exit; 317 318 if (!buffer.length || !buffer.pointer) 319 goto exit; 320 321 obj = buffer.pointer; 322 if (obj->type != ACPI_TYPE_BUFFER || 323 obj->buffer.length < sizeof(struct acpi_subtable_header)) 324 goto exit; 325 326 header = (struct acpi_subtable_header *)obj->buffer.pointer; 327 if (header->type == ACPI_MADT_TYPE_IO_APIC) 328 get_ioapic_id(header, gsi_base, phys_addr, &apic_id); 329 330 exit: 331 kfree(buffer.pointer); 332 return apic_id; 333 } 334 335 /** 336 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base 337 * @handle: ACPI object for IOAPIC device 338 * @gsi_base: GSI base to match with 339 * @phys_addr: Pointer to store physical address of matching IOAPIC record 340 * 341 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search 342 * for an ACPI IOAPIC record matching @gsi_base. 343 * Return IOAPIC id and store physical address in @phys_addr if found a match, 344 * otherwise return <0. 345 */ 346 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr) 347 { 348 int apic_id; 349 350 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr); 351 if (apic_id == -1) 352 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); 353 354 return apic_id; 355 } 356 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */ 357