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 <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 (!acpi_gicc_is_usable(gicc))
  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 */