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 & ACPI_MADT_ENABLED)) 94 return -ENODEV; 95 96 /* device_declaration means Device object in DSDT, in the 97 * GIC interrupt model, logical processors are required to 98 * have a Processor Device object in the DSDT, so we should 99 * check device_declaration here 100 */ 101 if (device_declaration && (gicc->uid == acpi_id)) { 102 *mpidr = gicc->arm_mpidr; 103 return 0; 104 } 105 106 return -EINVAL; 107 } 108 109 /* 110 * Retrieve the RISC-V hartid for the processor 111 */ 112 static int map_rintc_hartid(struct acpi_subtable_header *entry, 113 int device_declaration, u32 acpi_id, 114 phys_cpuid_t *hartid) 115 { 116 struct acpi_madt_rintc *rintc = 117 container_of(entry, struct acpi_madt_rintc, header); 118 119 if (!(rintc->flags & ACPI_MADT_ENABLED)) 120 return -ENODEV; 121 122 /* device_declaration means Device object in DSDT, in the 123 * RISC-V, logical processors are required to 124 * have a Processor Device object in the DSDT, so we should 125 * check device_declaration here 126 */ 127 if (device_declaration && rintc->uid == acpi_id) { 128 *hartid = rintc->hart_id; 129 return 0; 130 } 131 132 return -EINVAL; 133 } 134 135 /* 136 * Retrieve LoongArch CPU physical id 137 */ 138 static int map_core_pic_id(struct acpi_subtable_header *entry, 139 int device_declaration, u32 acpi_id, phys_cpuid_t *phys_id) 140 { 141 struct acpi_madt_core_pic *core_pic = 142 container_of(entry, struct acpi_madt_core_pic, header); 143 144 if (!(core_pic->flags & ACPI_MADT_ENABLED)) 145 return -ENODEV; 146 147 /* device_declaration means Device object in DSDT, in LoongArch 148 * system, logical processor acpi_id is required in _UID property 149 * of DSDT table, so we should check device_declaration here 150 */ 151 if (device_declaration && (core_pic->processor_id == acpi_id)) { 152 *phys_id = core_pic->core_id; 153 return 0; 154 } 155 156 return -EINVAL; 157 } 158 159 static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, 160 int type, u32 acpi_id) 161 { 162 unsigned long madt_end, entry; 163 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */ 164 165 if (!madt) 166 return phys_id; 167 168 entry = (unsigned long)madt; 169 madt_end = entry + madt->header.length; 170 171 /* Parse all entries looking for a match. */ 172 173 entry += sizeof(struct acpi_table_madt); 174 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 175 struct acpi_subtable_header *header = 176 (struct acpi_subtable_header *)entry; 177 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 178 if (!map_lapic_id(header, acpi_id, &phys_id)) 179 break; 180 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { 181 if (!map_x2apic_id(header, type, acpi_id, &phys_id)) 182 break; 183 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 184 if (!map_lsapic_id(header, type, acpi_id, &phys_id)) 185 break; 186 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { 187 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id)) 188 break; 189 } else if (header->type == ACPI_MADT_TYPE_RINTC) { 190 if (!map_rintc_hartid(header, type, acpi_id, &phys_id)) 191 break; 192 } else if (header->type == ACPI_MADT_TYPE_CORE_PIC) { 193 if (!map_core_pic_id(header, type, acpi_id, &phys_id)) 194 break; 195 } 196 entry += header->length; 197 } 198 return phys_id; 199 } 200 201 phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id) 202 { 203 struct acpi_table_madt *madt = NULL; 204 phys_cpuid_t rv; 205 206 acpi_get_table(ACPI_SIG_MADT, 0, 207 (struct acpi_table_header **)&madt); 208 if (!madt) 209 return PHYS_CPUID_INVALID; 210 211 rv = map_madt_entry(madt, 1, acpi_id); 212 213 acpi_put_table((struct acpi_table_header *)madt); 214 215 return rv; 216 } 217 218 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 219 { 220 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 221 union acpi_object *obj; 222 struct acpi_subtable_header *header; 223 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; 224 225 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 226 goto exit; 227 228 if (!buffer.length || !buffer.pointer) 229 goto exit; 230 231 obj = buffer.pointer; 232 if (obj->type != ACPI_TYPE_BUFFER || 233 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 234 goto exit; 235 } 236 237 header = (struct acpi_subtable_header *)obj->buffer.pointer; 238 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) 239 map_lapic_id(header, acpi_id, &phys_id); 240 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) 241 map_lsapic_id(header, type, acpi_id, &phys_id); 242 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) 243 map_x2apic_id(header, type, acpi_id, &phys_id); 244 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) 245 map_gicc_mpidr(header, type, acpi_id, &phys_id); 246 else if (header->type == ACPI_MADT_TYPE_CORE_PIC) 247 map_core_pic_id(header, type, acpi_id, &phys_id); 248 249 exit: 250 kfree(buffer.pointer); 251 return phys_id; 252 } 253 254 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) 255 { 256 phys_cpuid_t phys_id; 257 258 phys_id = map_mat_entry(handle, type, acpi_id); 259 if (invalid_phys_cpuid(phys_id)) 260 phys_id = map_madt_entry(get_madt_table(), type, acpi_id); 261 262 return phys_id; 263 } 264 EXPORT_SYMBOL_GPL(acpi_get_phys_id); 265 266 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id) 267 { 268 #ifdef CONFIG_SMP 269 int i; 270 #endif 271 272 if (invalid_phys_cpuid(phys_id)) { 273 /* 274 * On UP processor, there is no _MAT or MADT table. 275 * So above phys_id is always set to PHYS_CPUID_INVALID. 276 * 277 * BIOS may define multiple CPU handles even for UP processor. 278 * For example, 279 * 280 * Scope (_PR) 281 * { 282 * Processor (CPU0, 0x00, 0x00000410, 0x06) {} 283 * Processor (CPU1, 0x01, 0x00000410, 0x06) {} 284 * Processor (CPU2, 0x02, 0x00000410, 0x06) {} 285 * Processor (CPU3, 0x03, 0x00000410, 0x06) {} 286 * } 287 * 288 * Ignores phys_id and always returns 0 for the processor 289 * handle with acpi id 0 if nr_cpu_ids is 1. 290 * This should be the case if SMP tables are not found. 291 * Return -EINVAL for other CPU's handle. 292 */ 293 if (nr_cpu_ids <= 1 && acpi_id == 0) 294 return acpi_id; 295 else 296 return -EINVAL; 297 } 298 299 #ifdef CONFIG_SMP 300 for_each_possible_cpu(i) { 301 if (cpu_physical_id(i) == phys_id) 302 return i; 303 } 304 #else 305 /* In UP kernel, only processor 0 is valid */ 306 if (phys_id == 0) 307 return phys_id; 308 #endif 309 return -ENODEV; 310 } 311 312 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) 313 { 314 phys_cpuid_t phys_id; 315 316 phys_id = acpi_get_phys_id(handle, type, acpi_id); 317 318 return acpi_map_cpuid(phys_id, acpi_id); 319 } 320 EXPORT_SYMBOL_GPL(acpi_get_cpuid); 321 322 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC 323 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, 324 u64 *phys_addr, int *ioapic_id) 325 { 326 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; 327 328 if (ioapic->global_irq_base != gsi_base) 329 return 0; 330 331 *phys_addr = ioapic->address; 332 *ioapic_id = ioapic->id; 333 return 1; 334 } 335 336 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) 337 { 338 struct acpi_subtable_header *hdr; 339 unsigned long madt_end, entry; 340 struct acpi_table_madt *madt; 341 int apic_id = -1; 342 343 madt = get_madt_table(); 344 if (!madt) 345 return apic_id; 346 347 entry = (unsigned long)madt; 348 madt_end = entry + madt->header.length; 349 350 /* Parse all entries looking for a match. */ 351 entry += sizeof(struct acpi_table_madt); 352 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 353 hdr = (struct acpi_subtable_header *)entry; 354 if (hdr->type == ACPI_MADT_TYPE_IO_APIC && 355 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) 356 break; 357 else 358 entry += hdr->length; 359 } 360 361 return apic_id; 362 } 363 364 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, 365 u64 *phys_addr) 366 { 367 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 368 struct acpi_subtable_header *header; 369 union acpi_object *obj; 370 int apic_id = -1; 371 372 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 373 goto exit; 374 375 if (!buffer.length || !buffer.pointer) 376 goto exit; 377 378 obj = buffer.pointer; 379 if (obj->type != ACPI_TYPE_BUFFER || 380 obj->buffer.length < sizeof(struct acpi_subtable_header)) 381 goto exit; 382 383 header = (struct acpi_subtable_header *)obj->buffer.pointer; 384 if (header->type == ACPI_MADT_TYPE_IO_APIC) 385 get_ioapic_id(header, gsi_base, phys_addr, &apic_id); 386 387 exit: 388 kfree(buffer.pointer); 389 return apic_id; 390 } 391 392 /** 393 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base 394 * @handle: ACPI object for IOAPIC device 395 * @gsi_base: GSI base to match with 396 * @phys_addr: Pointer to store physical address of matching IOAPIC record 397 * 398 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search 399 * for an ACPI IOAPIC record matching @gsi_base. 400 * Return IOAPIC id and store physical address in @phys_addr if found a match, 401 * otherwise return <0. 402 */ 403 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr) 404 { 405 int apic_id; 406 407 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr); 408 if (apic_id == -1) 409 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); 410 411 return apic_id; 412 } 413 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */ 414