1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2005 Intel Corporation 4 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. 5 * 6 * Alex Chiang <achiang@hp.com> 7 * - Unified x86/ia64 implementations 8 * 9 * I/O APIC hotplug support 10 * Yinghai Lu <yinghai@kernel.org> 11 * Jiang Liu <jiang.liu@intel.com> 12 */ 13 #include <linux/export.h> 14 #include <linux/acpi.h> 15 #include <acpi/processor.h> 16 17 static struct acpi_table_madt *get_madt_table(void) 18 { 19 static struct acpi_table_madt *madt; 20 static int read_madt; 21 22 if (!read_madt) { 23 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 24 (struct acpi_table_header **)&madt))) 25 madt = NULL; 26 read_madt++; 27 } 28 29 return madt; 30 } 31 32 static int map_lapic_id(struct acpi_subtable_header *entry, 33 u32 acpi_id, phys_cpuid_t *apic_id) 34 { 35 struct acpi_madt_local_apic *lapic = 36 container_of(entry, struct acpi_madt_local_apic, header); 37 38 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) 39 return -ENODEV; 40 41 if (lapic->processor_id != acpi_id) 42 return -EINVAL; 43 44 *apic_id = lapic->id; 45 return 0; 46 } 47 48 static int map_x2apic_id(struct acpi_subtable_header *entry, 49 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) 50 { 51 struct acpi_madt_local_x2apic *apic = 52 container_of(entry, struct acpi_madt_local_x2apic, header); 53 54 if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) 55 return -ENODEV; 56 57 if (device_declaration && (apic->uid == acpi_id)) { 58 *apic_id = apic->local_apic_id; 59 return 0; 60 } 61 62 return -EINVAL; 63 } 64 65 static int map_lsapic_id(struct acpi_subtable_header *entry, 66 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) 67 { 68 struct acpi_madt_local_sapic *lsapic = 69 container_of(entry, struct acpi_madt_local_sapic, header); 70 71 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) 72 return -ENODEV; 73 74 if (device_declaration) { 75 if ((entry->length < 16) || (lsapic->uid != acpi_id)) 76 return -EINVAL; 77 } else if (lsapic->processor_id != acpi_id) 78 return -EINVAL; 79 80 *apic_id = (lsapic->id << 8) | lsapic->eid; 81 return 0; 82 } 83 84 /* 85 * Retrieve the ARM CPU physical identifier (MPIDR) 86 */ 87 static int map_gicc_mpidr(struct acpi_subtable_header *entry, 88 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr) 89 { 90 struct acpi_madt_generic_interrupt *gicc = 91 container_of(entry, struct acpi_madt_generic_interrupt, header); 92 93 if (!(gicc->flags & 94 (ACPI_MADT_ENABLED | ACPI_MADT_GICC_ONLINE_CAPABLE))) 95 return -ENODEV; 96 97 /* device_declaration means Device object in DSDT, in the 98 * GIC interrupt model, logical processors are required to 99 * have a Processor Device object in the DSDT, so we should 100 * check device_declaration here 101 */ 102 if (device_declaration && (gicc->uid == acpi_id)) { 103 *mpidr = gicc->arm_mpidr; 104 return 0; 105 } 106 107 return -EINVAL; 108 } 109 110 /* 111 * Retrieve the RISC-V hartid for the processor 112 */ 113 static int map_rintc_hartid(struct acpi_subtable_header *entry, 114 int device_declaration, u32 acpi_id, 115 phys_cpuid_t *hartid) 116 { 117 struct acpi_madt_rintc *rintc = 118 container_of(entry, struct acpi_madt_rintc, header); 119 120 if (!(rintc->flags & ACPI_MADT_ENABLED)) 121 return -ENODEV; 122 123 /* device_declaration means Device object in DSDT, in the 124 * RISC-V, logical processors are required to 125 * have a Processor Device object in the DSDT, so we should 126 * check device_declaration here 127 */ 128 if (device_declaration && rintc->uid == acpi_id) { 129 *hartid = rintc->hart_id; 130 return 0; 131 } 132 133 return -EINVAL; 134 } 135 136 /* 137 * Retrieve LoongArch CPU physical id 138 */ 139 static int map_core_pic_id(struct acpi_subtable_header *entry, 140 int device_declaration, u32 acpi_id, phys_cpuid_t *phys_id) 141 { 142 struct acpi_madt_core_pic *core_pic = 143 container_of(entry, struct acpi_madt_core_pic, header); 144 145 if (!(core_pic->flags & ACPI_MADT_ENABLED)) 146 return -ENODEV; 147 148 /* device_declaration means Device object in DSDT, in LoongArch 149 * system, logical processor acpi_id is required in _UID property 150 * of DSDT table, so we should check device_declaration here 151 */ 152 if (device_declaration && (core_pic->processor_id == acpi_id)) { 153 *phys_id = core_pic->core_id; 154 return 0; 155 } 156 157 return -EINVAL; 158 } 159 160 static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, 161 int type, u32 acpi_id) 162 { 163 unsigned long madt_end, entry; 164 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */ 165 166 if (!madt) 167 return phys_id; 168 169 entry = (unsigned long)madt; 170 madt_end = entry + madt->header.length; 171 172 /* Parse all entries looking for a match. */ 173 174 entry += sizeof(struct acpi_table_madt); 175 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 176 struct acpi_subtable_header *header = 177 (struct acpi_subtable_header *)entry; 178 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 179 if (!map_lapic_id(header, acpi_id, &phys_id)) 180 break; 181 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { 182 if (!map_x2apic_id(header, type, acpi_id, &phys_id)) 183 break; 184 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 185 if (!map_lsapic_id(header, type, acpi_id, &phys_id)) 186 break; 187 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { 188 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id)) 189 break; 190 } else if (header->type == ACPI_MADT_TYPE_RINTC) { 191 if (!map_rintc_hartid(header, type, acpi_id, &phys_id)) 192 break; 193 } else if (header->type == ACPI_MADT_TYPE_CORE_PIC) { 194 if (!map_core_pic_id(header, type, acpi_id, &phys_id)) 195 break; 196 } 197 entry += header->length; 198 } 199 return phys_id; 200 } 201 202 phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id) 203 { 204 struct acpi_table_madt *madt = NULL; 205 phys_cpuid_t rv; 206 207 acpi_get_table(ACPI_SIG_MADT, 0, 208 (struct acpi_table_header **)&madt); 209 if (!madt) 210 return PHYS_CPUID_INVALID; 211 212 rv = map_madt_entry(madt, 1, acpi_id); 213 214 acpi_put_table((struct acpi_table_header *)madt); 215 216 return rv; 217 } 218 219 int __init acpi_get_madt_revision(void) 220 { 221 struct acpi_table_header *madt = NULL; 222 int revision; 223 224 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, &madt))) 225 return -EINVAL; 226 227 revision = madt->revision; 228 229 acpi_put_table(madt); 230 231 return revision; 232 } 233 234 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 235 { 236 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 237 union acpi_object *obj; 238 struct acpi_subtable_header *header; 239 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; 240 241 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 242 goto exit; 243 244 if (!buffer.length || !buffer.pointer) 245 goto exit; 246 247 obj = buffer.pointer; 248 if (obj->type != ACPI_TYPE_BUFFER || 249 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 250 goto exit; 251 } 252 253 header = (struct acpi_subtable_header *)obj->buffer.pointer; 254 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) 255 map_lapic_id(header, acpi_id, &phys_id); 256 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) 257 map_lsapic_id(header, type, acpi_id, &phys_id); 258 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) 259 map_x2apic_id(header, type, acpi_id, &phys_id); 260 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) 261 map_gicc_mpidr(header, type, acpi_id, &phys_id); 262 else if (header->type == ACPI_MADT_TYPE_CORE_PIC) 263 map_core_pic_id(header, type, acpi_id, &phys_id); 264 265 exit: 266 kfree(buffer.pointer); 267 return phys_id; 268 } 269 270 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) 271 { 272 phys_cpuid_t phys_id; 273 274 phys_id = map_mat_entry(handle, type, acpi_id); 275 if (invalid_phys_cpuid(phys_id)) 276 phys_id = map_madt_entry(get_madt_table(), type, acpi_id); 277 278 return phys_id; 279 } 280 EXPORT_SYMBOL_GPL(acpi_get_phys_id); 281 282 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id) 283 { 284 #ifdef CONFIG_SMP 285 int i; 286 #endif 287 288 if (invalid_phys_cpuid(phys_id)) { 289 /* 290 * On UP processor, there is no _MAT or MADT table. 291 * So above phys_id is always set to PHYS_CPUID_INVALID. 292 * 293 * BIOS may define multiple CPU handles even for UP processor. 294 * For example, 295 * 296 * Scope (_PR) 297 * { 298 * Processor (CPU0, 0x00, 0x00000410, 0x06) {} 299 * Processor (CPU1, 0x01, 0x00000410, 0x06) {} 300 * Processor (CPU2, 0x02, 0x00000410, 0x06) {} 301 * Processor (CPU3, 0x03, 0x00000410, 0x06) {} 302 * } 303 * 304 * Ignores phys_id and always returns 0 for the processor 305 * handle with acpi id 0 if nr_cpu_ids is 1. 306 * This should be the case if SMP tables are not found. 307 * Return -EINVAL for other CPU's handle. 308 */ 309 if (nr_cpu_ids <= 1 && acpi_id == 0) 310 return acpi_id; 311 else 312 return -EINVAL; 313 } 314 315 #ifdef CONFIG_SMP 316 for_each_possible_cpu(i) { 317 if (cpu_physical_id(i) == phys_id) 318 return i; 319 } 320 #else 321 /* In UP kernel, only processor 0 is valid */ 322 if (phys_id == 0) 323 return phys_id; 324 #endif 325 return -ENODEV; 326 } 327 328 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) 329 { 330 phys_cpuid_t phys_id; 331 332 phys_id = acpi_get_phys_id(handle, type, acpi_id); 333 334 return acpi_map_cpuid(phys_id, acpi_id); 335 } 336 EXPORT_SYMBOL_GPL(acpi_get_cpuid); 337 338 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC 339 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, 340 u64 *phys_addr, int *ioapic_id) 341 { 342 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; 343 344 if (ioapic->global_irq_base != gsi_base) 345 return 0; 346 347 *phys_addr = ioapic->address; 348 *ioapic_id = ioapic->id; 349 return 1; 350 } 351 352 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) 353 { 354 struct acpi_subtable_header *hdr; 355 unsigned long madt_end, entry; 356 struct acpi_table_madt *madt; 357 int apic_id = -1; 358 359 madt = get_madt_table(); 360 if (!madt) 361 return apic_id; 362 363 entry = (unsigned long)madt; 364 madt_end = entry + madt->header.length; 365 366 /* Parse all entries looking for a match. */ 367 entry += sizeof(struct acpi_table_madt); 368 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 369 hdr = (struct acpi_subtable_header *)entry; 370 if (hdr->type == ACPI_MADT_TYPE_IO_APIC && 371 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) 372 break; 373 else 374 entry += hdr->length; 375 } 376 377 return apic_id; 378 } 379 380 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, 381 u64 *phys_addr) 382 { 383 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 384 struct acpi_subtable_header *header; 385 union acpi_object *obj; 386 int apic_id = -1; 387 388 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 389 goto exit; 390 391 if (!buffer.length || !buffer.pointer) 392 goto exit; 393 394 obj = buffer.pointer; 395 if (obj->type != ACPI_TYPE_BUFFER || 396 obj->buffer.length < sizeof(struct acpi_subtable_header)) 397 goto exit; 398 399 header = (struct acpi_subtable_header *)obj->buffer.pointer; 400 if (header->type == ACPI_MADT_TYPE_IO_APIC) 401 get_ioapic_id(header, gsi_base, phys_addr, &apic_id); 402 403 exit: 404 kfree(buffer.pointer); 405 return apic_id; 406 } 407 408 /** 409 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base 410 * @handle: ACPI object for IOAPIC device 411 * @gsi_base: GSI base to match with 412 * @phys_addr: Pointer to store physical address of matching IOAPIC record 413 * 414 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search 415 * for an ACPI IOAPIC record matching @gsi_base. 416 * Return IOAPIC id and store physical address in @phys_addr if found a match, 417 * otherwise return <0. 418 */ 419 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr) 420 { 421 int apic_id; 422 423 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr); 424 if (apic_id == -1) 425 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); 426 427 return apic_id; 428 } 429 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */ 430