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 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 18 ACPI_MODULE_NAME("processor_core"); 19 20 static struct acpi_table_madt *get_madt_table(void) 21 { 22 static struct acpi_table_madt *madt; 23 static int read_madt; 24 25 if (!read_madt) { 26 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, 27 (struct acpi_table_header **)&madt))) 28 madt = NULL; 29 read_madt++; 30 } 31 32 return madt; 33 } 34 35 static int map_lapic_id(struct acpi_subtable_header *entry, 36 u32 acpi_id, phys_cpuid_t *apic_id) 37 { 38 struct acpi_madt_local_apic *lapic = 39 container_of(entry, struct acpi_madt_local_apic, header); 40 41 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) 42 return -ENODEV; 43 44 if (lapic->processor_id != acpi_id) 45 return -EINVAL; 46 47 *apic_id = lapic->id; 48 return 0; 49 } 50 51 static int map_x2apic_id(struct acpi_subtable_header *entry, 52 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) 53 { 54 struct acpi_madt_local_x2apic *apic = 55 container_of(entry, struct acpi_madt_local_x2apic, header); 56 57 if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) 58 return -ENODEV; 59 60 if (device_declaration && (apic->uid == acpi_id)) { 61 *apic_id = apic->local_apic_id; 62 return 0; 63 } 64 65 return -EINVAL; 66 } 67 68 static int map_lsapic_id(struct acpi_subtable_header *entry, 69 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) 70 { 71 struct acpi_madt_local_sapic *lsapic = 72 container_of(entry, struct acpi_madt_local_sapic, header); 73 74 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) 75 return -ENODEV; 76 77 if (device_declaration) { 78 if ((entry->length < 16) || (lsapic->uid != acpi_id)) 79 return -EINVAL; 80 } else if (lsapic->processor_id != acpi_id) 81 return -EINVAL; 82 83 *apic_id = (lsapic->id << 8) | lsapic->eid; 84 return 0; 85 } 86 87 /* 88 * Retrieve the ARM CPU physical identifier (MPIDR) 89 */ 90 static int map_gicc_mpidr(struct acpi_subtable_header *entry, 91 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr) 92 { 93 struct acpi_madt_generic_interrupt *gicc = 94 container_of(entry, struct acpi_madt_generic_interrupt, header); 95 96 if (!(gicc->flags & ACPI_MADT_ENABLED)) 97 return -ENODEV; 98 99 /* device_declaration means Device object in DSDT, in the 100 * GIC interrupt model, logical processors are required to 101 * have a Processor Device object in the DSDT, so we should 102 * check device_declaration here 103 */ 104 if (device_declaration && (gicc->uid == acpi_id)) { 105 *mpidr = gicc->arm_mpidr; 106 return 0; 107 } 108 109 return -EINVAL; 110 } 111 112 static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, 113 int type, u32 acpi_id) 114 { 115 unsigned long madt_end, entry; 116 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */ 117 118 if (!madt) 119 return phys_id; 120 121 entry = (unsigned long)madt; 122 madt_end = entry + madt->header.length; 123 124 /* Parse all entries looking for a match. */ 125 126 entry += sizeof(struct acpi_table_madt); 127 while (entry + sizeof(struct acpi_subtable_header) < madt_end) { 128 struct acpi_subtable_header *header = 129 (struct acpi_subtable_header *)entry; 130 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { 131 if (!map_lapic_id(header, acpi_id, &phys_id)) 132 break; 133 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { 134 if (!map_x2apic_id(header, type, acpi_id, &phys_id)) 135 break; 136 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { 137 if (!map_lsapic_id(header, type, acpi_id, &phys_id)) 138 break; 139 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { 140 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id)) 141 break; 142 } 143 entry += header->length; 144 } 145 return phys_id; 146 } 147 148 phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id) 149 { 150 struct acpi_table_madt *madt = NULL; 151 phys_cpuid_t rv; 152 153 acpi_get_table(ACPI_SIG_MADT, 0, 154 (struct acpi_table_header **)&madt); 155 if (!madt) 156 return PHYS_CPUID_INVALID; 157 158 rv = map_madt_entry(madt, 1, acpi_id); 159 160 acpi_put_table((struct acpi_table_header *)madt); 161 162 return rv; 163 } 164 165 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) 166 { 167 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 168 union acpi_object *obj; 169 struct acpi_subtable_header *header; 170 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; 171 172 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) 173 goto exit; 174 175 if (!buffer.length || !buffer.pointer) 176 goto exit; 177 178 obj = buffer.pointer; 179 if (obj->type != ACPI_TYPE_BUFFER || 180 obj->buffer.length < sizeof(struct acpi_subtable_header)) { 181 goto exit; 182 } 183 184 header = (struct acpi_subtable_header *)obj->buffer.pointer; 185 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) 186 map_lapic_id(header, acpi_id, &phys_id); 187 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) 188 map_lsapic_id(header, type, acpi_id, &phys_id); 189 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) 190 map_x2apic_id(header, type, acpi_id, &phys_id); 191 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) 192 map_gicc_mpidr(header, type, acpi_id, &phys_id); 193 194 exit: 195 kfree(buffer.pointer); 196 return phys_id; 197 } 198 199 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) 200 { 201 phys_cpuid_t phys_id; 202 203 phys_id = map_mat_entry(handle, type, acpi_id); 204 if (invalid_phys_cpuid(phys_id)) 205 phys_id = map_madt_entry(get_madt_table(), type, acpi_id); 206 207 return phys_id; 208 } 209 EXPORT_SYMBOL_GPL(acpi_get_phys_id); 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