drivers/acpi/processor_core.c

   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 <[email protected]>
   7  *      - Unified x86/ia64 implementations
   8  *
   9  * I/O APIC hotplug support
  10  *      Yinghai Lu <[email protected]>
  11  *      Jiang Liu <[email protected]>
  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 static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
 110                                    int type, u32 acpi_id)
 111 {
 112         unsigned long madt_end, entry;
 113         phys_cpuid_t phys_id = PHYS_CPUID_INVALID;      /* CPU hardware ID */
 114
 115         if (!madt)
 116                 return phys_id;
 117
 118         entry = (unsigned long)madt;
 119         madt_end = entry + madt->header.length;
 120
 121         /* Parse all entries looking for a match. */
 122
 123         entry += sizeof(struct acpi_table_madt);
 124         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 125                 struct acpi_subtable_header *header =
 126                         (struct acpi_subtable_header *)entry;
 127                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 128                         if (!map_lapic_id(header, acpi_id, &phys_id))
 129                                 break;
 130                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 131                         if (!map_x2apic_id(header, type, acpi_id, &phys_id))
 132                                 break;
 133                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 134                         if (!map_lsapic_id(header, type, acpi_id, &phys_id))
 135                                 break;
 136                 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
 137                         if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))
 138                                 break;
 139                 }
 140                 entry += header->length;
 141         }
 142         return phys_id;
 143 }
 144
 145 phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
 146 {
 147         struct acpi_table_madt *madt = NULL;
 148         phys_cpuid_t rv;
 149
 150         acpi_get_table(ACPI_SIG_MADT, 0,
 151                        (struct acpi_table_header **)&madt);
 152         if (!madt)
 153                 return PHYS_CPUID_INVALID;
 154
 155         rv = map_madt_entry(madt, 1, acpi_id);
 156
 157         acpi_put_table((struct acpi_table_header *)madt);
 158
 159         return rv;
 160 }
 161
 162 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 163 {
 164         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 165         union acpi_object *obj;
 166         struct acpi_subtable_header *header;
 167         phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
 168
 169         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 170                 goto exit;
 171
 172         if (!buffer.length || !buffer.pointer)
 173                 goto exit;
 174
 175         obj = buffer.pointer;
 176         if (obj->type != ACPI_TYPE_BUFFER ||
 177             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 178                 goto exit;
 179         }
 180
 181         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 182         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
 183                 map_lapic_id(header, acpi_id, &phys_id);
 184         else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
 185                 map_lsapic_id(header, type, acpi_id, &phys_id);
 186         else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
 187                 map_x2apic_id(header, type, acpi_id, &phys_id);
 188         else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
 189                 map_gicc_mpidr(header, type, acpi_id, &phys_id);
 190
 191 exit:
 192         kfree(buffer.pointer);
 193         return phys_id;
 194 }
 195
 196 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
 197 {
 198         phys_cpuid_t phys_id;
 199
 200         phys_id = map_mat_entry(handle, type, acpi_id);
 201         if (invalid_phys_cpuid(phys_id))
 202                 phys_id = map_madt_entry(get_madt_table(), type, acpi_id);
 203
 204         return phys_id;
 205 }
 206 EXPORT_SYMBOL_GPL(acpi_get_phys_id);
 207
 208 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
 209 {
 210 #ifdef CONFIG_SMP
 211         int i;
 212 #endif
 213
 214         if (invalid_phys_cpuid(phys_id)) {
 215                 /*
 216                  * On UP processor, there is no _MAT or MADT table.
 217                  * So above phys_id is always set to PHYS_CPUID_INVALID.
 218                  *
 219                  * BIOS may define multiple CPU handles even for UP processor.
 220                  * For example,
 221                  *
 222                  * Scope (_PR)
 223                  * {
 224                  *     Processor (CPU0, 0x00, 0x00000410, 0x06) {}
 225                  *     Processor (CPU1, 0x01, 0x00000410, 0x06) {}
 226                  *     Processor (CPU2, 0x02, 0x00000410, 0x06) {}
 227                  *     Processor (CPU3, 0x03, 0x00000410, 0x06) {}
 228                  * }
 229                  *
 230                  * Ignores phys_id and always returns 0 for the processor
 231                  * handle with acpi id 0 if nr_cpu_ids is 1.
 232                  * This should be the case if SMP tables are not found.
 233                  * Return -EINVAL for other CPU's handle.
 234                  */
 235                 if (nr_cpu_ids <= 1 && acpi_id == 0)
 236                         return acpi_id;
 237                 else
 238                         return -EINVAL;
 239         }
 240
 241 #ifdef CONFIG_SMP
 242         for_each_possible_cpu(i) {
 243                 if (cpu_physical_id(i) == phys_id)
 244                         return i;
 245         }
 246 #else
 247         /* In UP kernel, only processor 0 is valid */
 248         if (phys_id == 0)
 249                 return phys_id;
 250 #endif
 251         return -ENODEV;
 252 }
 253
 254 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 255 {
 256         phys_cpuid_t phys_id;
 257
 258         phys_id = acpi_get_phys_id(handle, type, acpi_id);
 259
 260         return acpi_map_cpuid(phys_id, acpi_id);
 261 }
 262 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 263
 264 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 265 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
 266                          u64 *phys_addr, int *ioapic_id)
 267 {
 268         struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
 269
 270         if (ioapic->global_irq_base != gsi_base)
 271                 return 0;
 272
 273         *phys_addr = ioapic->address;
 274         *ioapic_id = ioapic->id;
 275         return 1;
 276 }
 277
 278 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
 279 {
 280         struct acpi_subtable_header *hdr;
 281         unsigned long madt_end, entry;
 282         struct acpi_table_madt *madt;
 283         int apic_id = -1;
 284
 285         madt = get_madt_table();
 286         if (!madt)
 287                 return apic_id;
 288
 289         entry = (unsigned long)madt;
 290         madt_end = entry + madt->header.length;
 291
 292         /* Parse all entries looking for a match. */
 293         entry += sizeof(struct acpi_table_madt);
 294         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 295                 hdr = (struct acpi_subtable_header *)entry;
 296                 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
 297                     get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
 298                         break;
 299                 else
 300                         entry += hdr->length;
 301         }
 302
 303         return apic_id;
 304 }
 305
 306 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
 307                                   u64 *phys_addr)
 308 {
 309         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 310         struct acpi_subtable_header *header;
 311         union acpi_object *obj;
 312         int apic_id = -1;
 313
 314         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 315                 goto exit;
 316
 317         if (!buffer.length || !buffer.pointer)
 318                 goto exit;
 319
 320         obj = buffer.pointer;
 321         if (obj->type != ACPI_TYPE_BUFFER ||
 322             obj->buffer.length < sizeof(struct acpi_subtable_header))
 323                 goto exit;
 324
 325         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 326         if (header->type == ACPI_MADT_TYPE_IO_APIC)
 327                 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
 328
 329 exit:
 330         kfree(buffer.pointer);
 331         return apic_id;
 332 }
 333
 334 /**
 335  * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
 336  * @handle:     ACPI object for IOAPIC device
 337  * @gsi_base:   GSI base to match with
 338  * @phys_addr:  Pointer to store physical address of matching IOAPIC record
 339  *
 340  * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
 341  * for an ACPI IOAPIC record matching @gsi_base.
 342  * Return IOAPIC id and store physical address in @phys_addr if found a match,
 343  * otherwise return <0.
 344  */
 345 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
 346 {
 347         int apic_id;
 348
 349         apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
 350         if (apic_id == -1)
 351                 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
 352
 353         return apic_id;
 354 }
 355 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */