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 acpi_size tbl_size; 151 phys_cpuid_t rv; 152 153 acpi_get_table_with_size(ACPI_SIG_MADT, 0, 154 (struct acpi_table_header **)&madt, 155 &tbl_size); 156 if (!madt) 157 return PHYS_CPUID_INVALID; 158 159 rv = map_madt_entry(madt, 1, acpi_id); 160 161 early_acpi_os_unmap_memory(madt, tbl_size); 162 163 return rv; 164 } 165 166 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 167 { 168 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 169 union acpi_object *obj; 170 struct acpi_subtable_header *header; 171 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; 172 173 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 174 goto exit; 175 176 if (!buffer.length || !buffer.pointer) 177 goto exit; 178 179 obj = buffer.pointer; 180 if (obj->type != ACPI_TYPE_BUFFER || 181 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 182 goto exit; 183 } 184 185 header = (struct acpi_subtable_header *)obj->buffer.pointer; 186 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) 187 map_lapic_id(header, acpi_id, &phys_id); 188 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) 189 map_lsapic_id(header, type, acpi_id, &phys_id); 190 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) 191 map_x2apic_id(header, type, acpi_id, &phys_id); 192 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) 193 map_gicc_mpidr(header, type, acpi_id, &phys_id); 194 195 exit: 196 kfree(buffer.pointer); 197 return phys_id; 198 } 199 200 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) 201 { 202 phys_cpuid_t phys_id; 203 204 phys_id = map_mat_entry(handle, type, acpi_id); 205 if (invalid_phys_cpuid(phys_id)) 206 phys_id = map_madt_entry(get_madt_table(), type, acpi_id); 207 208 return phys_id; 209 } 210 211 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id) 212 { 213 #ifdef CONFIG_SMP 214 int i; 215 #endif 216 217 if (invalid_phys_cpuid(phys_id)) { 218 /* 219 * On UP processor, there is no _MAT or MADT table. 220 * So above phys_id is always set to PHYS_CPUID_INVALID. 221 * 222 * BIOS may define multiple CPU handles even for UP processor. 223 * For example, 224 * 225 * Scope (_PR) 226 * { 227 * Processor (CPU0, 0x00, 0x00000410, 0x06) {} 228 * Processor (CPU1, 0x01, 0x00000410, 0x06) {} 229 * Processor (CPU2, 0x02, 0x00000410, 0x06) {} 230 * Processor (CPU3, 0x03, 0x00000410, 0x06) {} 231 * } 232 * 233 * Ignores phys_id and always returns 0 for the processor 234 * handle with acpi id 0 if nr_cpu_ids is 1. 235 * This should be the case if SMP tables are not found. 236 * Return -EINVAL for other CPU's handle. 237 */ 238 if (nr_cpu_ids <= 1 && acpi_id == 0) 239 return acpi_id; 240 else 241 return -EINVAL; 242 } 243 244 #ifdef CONFIG_SMP 245 for_each_possible_cpu(i) { 246 if (cpu_physical_id(i) == phys_id) 247 return i; 248 } 249 #else 250 /* In UP kernel, only processor 0 is valid */ 251 if (phys_id == 0) 252 return phys_id; 253 #endif 254 return -ENODEV; 255 } 256 257 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) 258 { 259 phys_cpuid_t phys_id; 260 261 phys_id = acpi_get_phys_id(handle, type, acpi_id); 262 263 return acpi_map_cpuid(phys_id, acpi_id); 264 } 265 EXPORT_SYMBOL_GPL(acpi_get_cpuid); 266 267 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC 268 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, 269 u64 *phys_addr, int *ioapic_id) 270 { 271 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; 272 273 if (ioapic->global_irq_base != gsi_base) 274 return 0; 275 276 *phys_addr = ioapic->address; 277 *ioapic_id = ioapic->id; 278 return 1; 279 } 280 281 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) 282 { 283 struct acpi_subtable_header *hdr; 284 unsigned long madt_end, entry; 285 struct acpi_table_madt *madt; 286 int apic_id = -1; 287 288 madt = get_madt_table(); 289 if (!madt) 290 return apic_id; 291 292 entry = (unsigned long)madt; 293 madt_end = entry + madt->header.length; 294 295 /* Parse all entries looking for a match. */ 296 entry += sizeof(struct acpi_table_madt); 297 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 298 hdr = (struct acpi_subtable_header *)entry; 299 if (hdr->type == ACPI_MADT_TYPE_IO_APIC && 300 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) 301 break; 302 else 303 entry += hdr->length; 304 } 305 306 return apic_id; 307 } 308 309 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, 310 u64 *phys_addr) 311 { 312 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 313 struct acpi_subtable_header *header; 314 union acpi_object *obj; 315 int apic_id = -1; 316 317 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 318 goto exit; 319 320 if (!buffer.length || !buffer.pointer) 321 goto exit; 322 323 obj = buffer.pointer; 324 if (obj->type != ACPI_TYPE_BUFFER || 325 obj->buffer.length < sizeof(struct acpi_subtable_header)) 326 goto exit; 327 328 header = (struct acpi_subtable_header *)obj->buffer.pointer; 329 if (header->type == ACPI_MADT_TYPE_IO_APIC) 330 get_ioapic_id(header, gsi_base, phys_addr, &apic_id); 331 332 exit: 333 kfree(buffer.pointer); 334 return apic_id; 335 } 336 337 /** 338 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base 339 * @handle: ACPI object for IOAPIC device 340 * @gsi_base: GSI base to match with 341 * @phys_addr: Pointer to store physical address of matching IOAPIC record 342 * 343 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search 344 * for an ACPI IOAPIC record matching @gsi_base. 345 * Return IOAPIC id and store physical address in @phys_addr if found a match, 346 * otherwise return <0. 347 */ 348 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr) 349 { 350 int apic_id; 351 352 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr); 353 if (apic_id == -1) 354 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); 355 356 return apic_id; 357 } 358 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */ 359