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