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  *      Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
   8  *      - Added _PDC for platforms with Intel CPUs
   9  */
  10 #include <linux/dmi.h>
  11
  12 #include <acpi/acpi_drivers.h>
  13 #include <acpi/processor.h>
  14
  15 #include "internal.h"
  16
  17 #define PREFIX                  "ACPI: "
  18 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
  19 ACPI_MODULE_NAME("processor_core");
  20
  21 static int set_no_mwait(const struct dmi_system_id *id)
  22 {
  23         printk(KERN_NOTICE PREFIX "%s detected - "
  24                 "disabling mwait for CPU C-states\n", id->ident);
  25         idle_nomwait = 1;
  26         return 0;
  27 }
  28
  29 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
  30         {
  31         set_no_mwait, "IFL91 board", {
  32         DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
  33         DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
  34         DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
  35         DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
  36         {
  37         set_no_mwait, "Extensa 5220", {
  38         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
  39         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
  40         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
  41         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
  42         {},
  43 };
  44
  45 #ifdef CONFIG_SMP
  46 static struct acpi_table_madt *madt;
  47
  48 static int map_lapic_id(struct acpi_subtable_header *entry,
  49                  u32 acpi_id, int *apic_id)
  50 {
  51         struct acpi_madt_local_apic *lapic =
  52                 (struct acpi_madt_local_apic *)entry;
  53
  54         if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
  55                 return 0;
  56
  57         if (lapic->processor_id != acpi_id)
  58                 return 0;
  59
  60         *apic_id = lapic->id;
  61         return 1;
  62 }
  63
  64 static int map_x2apic_id(struct acpi_subtable_header *entry,
  65                          int device_declaration, u32 acpi_id, int *apic_id)
  66 {
  67         struct acpi_madt_local_x2apic *apic =
  68                 (struct acpi_madt_local_x2apic *)entry;
  69
  70         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
  71                 return 0;
  72
  73         if (device_declaration && (apic->uid == acpi_id)) {
  74                 *apic_id = apic->local_apic_id;
  75                 return 1;
  76         }
  77
  78         return 0;
  79 }
  80
  81 static int map_lsapic_id(struct acpi_subtable_header *entry,
  82                 int device_declaration, u32 acpi_id, int *apic_id)
  83 {
  84         struct acpi_madt_local_sapic *lsapic =
  85                 (struct acpi_madt_local_sapic *)entry;
  86
  87         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
  88                 return 0;
  89
  90         if (device_declaration) {
  91                 if ((entry->length < 16) || (lsapic->uid != acpi_id))
  92                         return 0;
  93         } else if (lsapic->processor_id != acpi_id)
  94                 return 0;
  95
  96         *apic_id = (lsapic->id << 8) | lsapic->eid;
  97         return 1;
  98 }
  99
 100 static int map_madt_entry(int type, u32 acpi_id)
 101 {
 102         unsigned long madt_end, entry;
 103         int apic_id = -1;
 104
 105         if (!madt)
 106                 return apic_id;
 107
 108         entry = (unsigned long)madt;
 109         madt_end = entry + madt->header.length;
 110
 111         /* Parse all entries looking for a match. */
 112
 113         entry += sizeof(struct acpi_table_madt);
 114         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 115                 struct acpi_subtable_header *header =
 116                         (struct acpi_subtable_header *)entry;
 117                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 118                         if (map_lapic_id(header, acpi_id, &apic_id))
 119                                 break;
 120                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 121                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 122                                 break;
 123                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 124                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 125                                 break;
 126                 }
 127                 entry += header->length;
 128         }
 129         return apic_id;
 130 }
 131
 132 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 133 {
 134         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 135         union acpi_object *obj;
 136         struct acpi_subtable_header *header;
 137         int apic_id = -1;
 138
 139         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 140                 goto exit;
 141
 142         if (!buffer.length || !buffer.pointer)
 143                 goto exit;
 144
 145         obj = buffer.pointer;
 146         if (obj->type != ACPI_TYPE_BUFFER ||
 147             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 148                 goto exit;
 149         }
 150
 151         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 152         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 153                 map_lapic_id(header, acpi_id, &apic_id);
 154         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 155                 map_lsapic_id(header, type, acpi_id, &apic_id);
 156         }
 157
 158 exit:
 159         if (buffer.pointer)
 160                 kfree(buffer.pointer);
 161         return apic_id;
 162 }
 163
 164 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 165 {
 166         int i;
 167         int apic_id = -1;
 168
 169         apic_id = map_mat_entry(handle, type, acpi_id);
 170         if (apic_id == -1)
 171                 apic_id = map_madt_entry(type, acpi_id);
 172         if (apic_id == -1)
 173                 return apic_id;
 174
 175         for_each_possible_cpu(i) {
 176                 if (cpu_physical_id(i) == apic_id)
 177                         return i;
 178         }
 179         return -1;
 180 }
 181 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 182 #endif
 183
 184 static bool processor_physically_present(acpi_handle handle)
 185 {
 186         int cpuid, type;
 187         u32 acpi_id;
 188         acpi_status status;
 189         acpi_object_type acpi_type;
 190         unsigned long long tmp;
 191         union acpi_object object = { 0 };
 192         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 193
 194         status = acpi_get_type(handle, &acpi_type);
 195         if (ACPI_FAILURE(status))
 196                 return false;
 197
 198         switch (acpi_type) {
 199         case ACPI_TYPE_PROCESSOR:
 200                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
 201                 if (ACPI_FAILURE(status))
 202                         return false;
 203                 acpi_id = object.processor.proc_id;
 204                 break;
 205         case ACPI_TYPE_DEVICE:
 206                 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
 207                 if (ACPI_FAILURE(status))
 208                         return false;
 209                 acpi_id = tmp;
 210                 break;
 211         default:
 212                 return false;
 213         }
 214
 215         type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
 216         cpuid = acpi_get_cpuid(handle, type, acpi_id);
 217
 218         if (cpuid == -1)
 219                 return false;
 220
 221         return true;
 222 }
 223
 224 static void acpi_set_pdc_bits(u32 *buf)
 225 {
 226         buf[0] = ACPI_PDC_REVISION_ID;
 227         buf[1] = 1;
 228
 229         /* Enable coordination with firmware's _TSD info */
 230         buf[2] = ACPI_PDC_SMP_T_SWCOORD;
 231
 232         /* Twiddle arch-specific bits needed for _PDC */
 233         arch_acpi_set_pdc_bits(buf);
 234 }
 235
 236 static struct acpi_object_list *acpi_processor_alloc_pdc(void)
 237 {
 238         struct acpi_object_list *obj_list;
 239         union acpi_object *obj;
 240         u32 *buf;
 241
 242         /* allocate and initialize pdc. It will be used later. */
 243         obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
 244         if (!obj_list) {
 245                 printk(KERN_ERR "Memory allocation error\n");
 246                 return NULL;
 247         }
 248
 249         obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
 250         if (!obj) {
 251                 printk(KERN_ERR "Memory allocation error\n");
 252                 kfree(obj_list);
 253                 return NULL;
 254         }
 255
 256         buf = kmalloc(12, GFP_KERNEL);
 257         if (!buf) {
 258                 printk(KERN_ERR "Memory allocation error\n");
 259                 kfree(obj);
 260                 kfree(obj_list);
 261                 return NULL;
 262         }
 263
 264         acpi_set_pdc_bits(buf);
 265
 266         obj->type = ACPI_TYPE_BUFFER;
 267         obj->buffer.length = 12;
 268         obj->buffer.pointer = (u8 *) buf;
 269         obj_list->count = 1;
 270         obj_list->pointer = obj;
 271
 272         return obj_list;
 273 }
 274
 275 /*
 276  * _PDC is required for a BIOS-OS handshake for most of the newer
 277  * ACPI processor features.
 278  */
 279 static int
 280 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
 281 {
 282         acpi_status status = AE_OK;
 283
 284         if (idle_nomwait) {
 285                 /*
 286                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 287                  * mode will be disabled in the parameter of _PDC object.
 288                  * Of course C1_FFH access mode will also be disabled.
 289                  */
 290                 union acpi_object *obj;
 291                 u32 *buffer = NULL;
 292
 293                 obj = pdc_in->pointer;
 294                 buffer = (u32 *)(obj->buffer.pointer);
 295                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 296
 297         }
 298         status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
 299
 300         if (ACPI_FAILURE(status))
 301                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 302                     "Could not evaluate _PDC, using legacy perf. control.\n"));
 303
 304         return status;
 305 }
 306
 307 void acpi_processor_set_pdc(acpi_handle handle)
 308 {
 309         struct acpi_object_list *obj_list;
 310
 311         if (arch_has_acpi_pdc() == false)
 312                 return;
 313
 314         obj_list = acpi_processor_alloc_pdc();
 315         if (!obj_list)
 316                 return;
 317
 318         acpi_processor_eval_pdc(handle, obj_list);
 319
 320         kfree(obj_list->pointer->buffer.pointer);
 321         kfree(obj_list->pointer);
 322         kfree(obj_list);
 323 }
 324 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
 325
 326 static acpi_status
 327 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
 328 {
 329         if (processor_physically_present(handle) == false)
 330                 return AE_OK;
 331
 332         acpi_processor_set_pdc(handle);
 333         return AE_OK;
 334 }
 335
 336 void __init acpi_early_processor_set_pdc(void)
 337 {
 338
 339 #ifdef CONFIG_SMP
 340         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
 341                                 (struct acpi_table_header **)&madt)))
 342                 madt = NULL;
 343 #endif
 344
 345         /*
 346          * Check whether the system is DMI table. If yes, OSPM
 347          * should not use mwait for CPU-states.
 348          */
 349         dmi_check_system(processor_idle_dmi_table);
 350
 351         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 352                             ACPI_UINT32_MAX,
 353                             early_init_pdc, NULL, NULL, NULL);
 354 }