drivers/acpi/processor_core.c

   1 /*
   2  * Copyright (C) 2005 Intel Corporation
   3  * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
   4  *
   5  *      Alex Chiang <achiang@hp.com>
   6  *      - Unified x86/ia64 implementations
   7  *
   8  * I/O APIC hotplug support
   9  *      Yinghai Lu <yinghai@kernel.org>
  10  *      Jiang Liu <jiang.liu@intel.com>
  11  */
  12 #include <linux/export.h>
  13 #include <linux/acpi.h>
  14 #include <acpi/processor.h>
  15
  16 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  17 ACPI_MODULE_NAME("processor_core");
  18
  19 static struct acpi_table_madt *get_madt_table(void)
  20 {
  21         static struct acpi_table_madt *madt;
  22         static int read_madt;
  23
  24         if (!read_madt) {
  25                 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
  26                                         (struct acpi_table_header **)&madt)))
  27                         madt = NULL;
  28                 read_madt++;
  29         }
  30
  31         return madt;
  32 }
  33
  34 static int map_lapic_id(struct acpi_subtable_header *entry,
  35                  u32 acpi_id, phys_cpuid_t *apic_id, bool ignore_disabled)
  36 {
  37         struct acpi_madt_local_apic *lapic =
  38                 container_of(entry, struct acpi_madt_local_apic, header);
  39
  40         if (ignore_disabled && !(lapic->lapic_flags & ACPI_MADT_ENABLED))
  41                 return -ENODEV;
  42
  43         if (lapic->processor_id != acpi_id)
  44                 return -EINVAL;
  45
  46         *apic_id = lapic->id;
  47         return 0;
  48 }
  49
  50 static int map_x2apic_id(struct acpi_subtable_header *entry,
  51                 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id,
  52                 bool ignore_disabled)
  53 {
  54         struct acpi_madt_local_x2apic *apic =
  55                 container_of(entry, struct acpi_madt_local_x2apic, header);
  56
  57         if (ignore_disabled && !(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                 bool ignore_disabled)
  71 {
  72         struct acpi_madt_local_sapic *lsapic =
  73                 container_of(entry, struct acpi_madt_local_sapic, header);
  74
  75         if (ignore_disabled && !(lsapic->lapic_flags & ACPI_MADT_ENABLED))
  76                 return -ENODEV;
  77
  78         if (device_declaration) {
  79                 if ((entry->length < 16) || (lsapic->uid != acpi_id))
  80                         return -EINVAL;
  81         } else if (lsapic->processor_id != acpi_id)
  82                 return -EINVAL;
  83
  84         *apic_id = (lsapic->id << 8) | lsapic->eid;
  85         return 0;
  86 }
  87
  88 /*
  89  * Retrieve the ARM CPU physical identifier (MPIDR)
  90  */
  91 static int map_gicc_mpidr(struct acpi_subtable_header *entry,
  92                 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr,
  93                 bool ignore_disabled)
  94 {
  95         struct acpi_madt_generic_interrupt *gicc =
  96             container_of(entry, struct acpi_madt_generic_interrupt, header);
  97
  98         if (ignore_disabled && !(gicc->flags & ACPI_MADT_ENABLED))
  99                 return -ENODEV;
 100
 101         /* device_declaration means Device object in DSDT, in the
 102          * GIC interrupt model, logical processors are required to
 103          * have a Processor Device object in the DSDT, so we should
 104          * check device_declaration here
 105          */
 106         if (device_declaration && (gicc->uid == acpi_id)) {
 107                 *mpidr = gicc->arm_mpidr;
 108                 return 0;
 109         }
 110
 111         return -EINVAL;
 112 }
 113
 114 static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
 115                                    int type, u32 acpi_id, bool ignore_disabled)
 116 {
 117         unsigned long madt_end, entry;
 118         phys_cpuid_t phys_id = PHYS_CPUID_INVALID;      /* CPU hardware ID */
 119
 120         if (!madt)
 121                 return phys_id;
 122
 123         entry = (unsigned long)madt;
 124         madt_end = entry + madt->header.length;
 125
 126         /* Parse all entries looking for a match. */
 127
 128         entry += sizeof(struct acpi_table_madt);
 129         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 130                 struct acpi_subtable_header *header =
 131                         (struct acpi_subtable_header *)entry;
 132                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 133                         if (!map_lapic_id(header, acpi_id, &phys_id,
 134                                           ignore_disabled))
 135                                 break;
 136                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 137                         if (!map_x2apic_id(header, type, acpi_id, &phys_id,
 138                                            ignore_disabled))
 139                                 break;
 140                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 141                         if (!map_lsapic_id(header, type, acpi_id, &phys_id,
 142                                            ignore_disabled))
 143                                 break;
 144                 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
 145                         if (!map_gicc_mpidr(header, type, acpi_id, &phys_id,
 146                                             ignore_disabled))
 147                                 break;
 148                 }
 149                 entry += header->length;
 150         }
 151         return phys_id;
 152 }
 153
 154 phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
 155 {
 156         struct acpi_table_madt *madt = NULL;
 157         phys_cpuid_t rv;
 158
 159         acpi_get_table(ACPI_SIG_MADT, 0,
 160                        (struct acpi_table_header **)&madt);
 161         if (!madt)
 162                 return PHYS_CPUID_INVALID;
 163
 164         rv = map_madt_entry(madt, 1, acpi_id, true);
 165
 166         acpi_put_table((struct acpi_table_header *)madt);
 167
 168         return rv;
 169 }
 170
 171 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id,
 172                                   bool ignore_disabled)
 173 {
 174         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 175         union acpi_object *obj;
 176         struct acpi_subtable_header *header;
 177         phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
 178
 179         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 180                 goto exit;
 181
 182         if (!buffer.length || !buffer.pointer)
 183                 goto exit;
 184
 185         obj = buffer.pointer;
 186         if (obj->type != ACPI_TYPE_BUFFER ||
 187             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 188                 goto exit;
 189         }
 190
 191         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 192         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
 193                 map_lapic_id(header, acpi_id, &phys_id, ignore_disabled);
 194         else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
 195                 map_lsapic_id(header, type, acpi_id, &phys_id, ignore_disabled);
 196         else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
 197                 map_x2apic_id(header, type, acpi_id, &phys_id, ignore_disabled);
 198         else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
 199                 map_gicc_mpidr(header, type, acpi_id, &phys_id,
 200                                ignore_disabled);
 201
 202 exit:
 203         kfree(buffer.pointer);
 204         return phys_id;
 205 }
 206
 207 static phys_cpuid_t __acpi_get_phys_id(acpi_handle handle, int type,
 208                                        u32 acpi_id, bool ignore_disabled)
 209 {
 210         phys_cpuid_t phys_id;
 211
 212         phys_id = map_mat_entry(handle, type, acpi_id, ignore_disabled);
 213         if (invalid_phys_cpuid(phys_id))
 214                 phys_id = map_madt_entry(get_madt_table(), type, acpi_id,
 215                                            ignore_disabled);
 216
 217         return phys_id;
 218 }
 219
 220 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
 221 {
 222         return __acpi_get_phys_id(handle, type, acpi_id, true);
 223 }
 224
 225 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
 226 {
 227 #ifdef CONFIG_SMP
 228         int i;
 229 #endif
 230
 231         if (invalid_phys_cpuid(phys_id)) {
 232                 /*
 233                  * On UP processor, there is no _MAT or MADT table.
 234                  * So above phys_id is always set to PHYS_CPUID_INVALID.
 235                  *
 236                  * BIOS may define multiple CPU handles even for UP processor.
 237                  * For example,
 238                  *
 239                  * Scope (_PR)
 240                  * {
 241                  *     Processor (CPU0, 0x00, 0x00000410, 0x06) {}
 242                  *     Processor (CPU1, 0x01, 0x00000410, 0x06) {}
 243                  *     Processor (CPU2, 0x02, 0x00000410, 0x06) {}
 244                  *     Processor (CPU3, 0x03, 0x00000410, 0x06) {}
 245                  * }
 246                  *
 247                  * Ignores phys_id and always returns 0 for the processor
 248                  * handle with acpi id 0 if nr_cpu_ids is 1.
 249                  * This should be the case if SMP tables are not found.
 250                  * Return -EINVAL for other CPU's handle.
 251                  */
 252                 if (nr_cpu_ids <= 1 && acpi_id == 0)
 253                         return acpi_id;
 254                 else
 255                         return -EINVAL;
 256         }
 257
 258 #ifdef CONFIG_SMP
 259         for_each_possible_cpu(i) {
 260                 if (cpu_physical_id(i) == phys_id)
 261                         return i;
 262         }
 263 #else
 264         /* In UP kernel, only processor 0 is valid */
 265         if (phys_id == 0)
 266                 return phys_id;
 267 #endif
 268         return -ENODEV;
 269 }
 270
 271 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 272 {
 273         phys_cpuid_t phys_id;
 274
 275         phys_id = acpi_get_phys_id(handle, type, acpi_id);
 276
 277         return acpi_map_cpuid(phys_id, acpi_id);
 278 }
 279 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 280
 281 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
 282 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
 283                          u64 *phys_addr, int *ioapic_id)
 284 {
 285         struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
 286
 287         if (ioapic->global_irq_base != gsi_base)
 288                 return 0;
 289
 290         *phys_addr = ioapic->address;
 291         *ioapic_id = ioapic->id;
 292         return 1;
 293 }
 294
 295 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
 296 {
 297         struct acpi_subtable_header *hdr;
 298         unsigned long madt_end, entry;
 299         struct acpi_table_madt *madt;
 300         int apic_id = -1;
 301
 302         madt = get_madt_table();
 303         if (!madt)
 304                 return apic_id;
 305
 306         entry = (unsigned long)madt;
 307         madt_end = entry + madt->header.length;
 308
 309         /* Parse all entries looking for a match. */
 310         entry += sizeof(struct acpi_table_madt);
 311         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 312                 hdr = (struct acpi_subtable_header *)entry;
 313                 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
 314                     get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
 315                         break;
 316                 else
 317                         entry += hdr->length;
 318         }
 319
 320         return apic_id;
 321 }
 322
 323 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
 324                                   u64 *phys_addr)
 325 {
 326         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 327         struct acpi_subtable_header *header;
 328         union acpi_object *obj;
 329         int apic_id = -1;
 330
 331         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 332                 goto exit;
 333
 334         if (!buffer.length || !buffer.pointer)
 335                 goto exit;
 336
 337         obj = buffer.pointer;
 338         if (obj->type != ACPI_TYPE_BUFFER ||
 339             obj->buffer.length < sizeof(struct acpi_subtable_header))
 340                 goto exit;
 341
 342         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 343         if (header->type == ACPI_MADT_TYPE_IO_APIC)
 344                 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
 345
 346 exit:
 347         kfree(buffer.pointer);
 348         return apic_id;
 349 }
 350
 351 /**
 352  * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
 353  * @handle:     ACPI object for IOAPIC device
 354  * @gsi_base:   GSI base to match with
 355  * @phys_addr:  Pointer to store physical address of matching IOAPIC record
 356  *
 357  * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
 358  * for an ACPI IOAPIC record matching @gsi_base.
 359  * Return IOAPIC id and store physical address in @phys_addr if found a match,
 360  * otherwise return <0.
 361  */
 362 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
 363 {
 364         int apic_id;
 365
 366         apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
 367         if (apic_id == -1)
 368                 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
 369
 370         return apic_id;
 371 }
 372 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */