SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         u32 tmp = apic->local_apic_id;
  70
  71         /* Only check enabled APICs*/
  72         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
  73                 return 0;
  74
  75         /* Device statement declaration type */
  76         if (device_declaration) {
  77                 if (apic->uid == acpi_id)
  78                         goto found;
  79         }
  80
  81         return 0;
  82 found:
  83         *apic_id = tmp;
  84         return 1;
  85 }
  86
  87 static int map_lsapic_id(struct acpi_subtable_header *entry,
  88                 int device_declaration, u32 acpi_id, int *apic_id)
  89 {
  90         struct acpi_madt_local_sapic *lsapic =
  91                 (struct acpi_madt_local_sapic *)entry;
  92         u32 tmp = (lsapic->id << 8) | lsapic->eid;
  93
  94         /* Only check enabled APICs*/
  95         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
  96                 return 0;
  97
  98         /* Device statement declaration type */
  99         if (device_declaration) {
 100                 if (entry->length < 16)
 101                         printk(KERN_ERR PREFIX
 102                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 103                             tmp);
 104                 else if (lsapic->uid == acpi_id)
 105                         goto found;
 106         /* Processor statement declaration type */
 107         } else if (lsapic->processor_id == acpi_id)
 108                 goto found;
 109
 110         return 0;
 111 found:
 112         *apic_id = tmp;
 113         return 1;
 114 }
 115
 116 static int map_madt_entry(int type, u32 acpi_id)
 117 {
 118         unsigned long madt_end, entry;
 119         int apic_id = -1;
 120
 121         if (!madt)
 122                 return apic_id;
 123
 124         entry = (unsigned long)madt;
 125         madt_end = entry + madt->header.length;
 126
 127         /* Parse all entries looking for a match. */
 128
 129         entry += sizeof(struct acpi_table_madt);
 130         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 131                 struct acpi_subtable_header *header =
 132                         (struct acpi_subtable_header *)entry;
 133                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 134                         if (map_lapic_id(header, acpi_id, &apic_id))
 135                                 break;
 136                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 137                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 138                                 break;
 139                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 140                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 141                                 break;
 142                 }
 143                 entry += header->length;
 144         }
 145         return apic_id;
 146 }
 147
 148 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 149 {
 150         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 151         union acpi_object *obj;
 152         struct acpi_subtable_header *header;
 153         int apic_id = -1;
 154
 155         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 156                 goto exit;
 157
 158         if (!buffer.length || !buffer.pointer)
 159                 goto exit;
 160
 161         obj = buffer.pointer;
 162         if (obj->type != ACPI_TYPE_BUFFER ||
 163             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 164                 goto exit;
 165         }
 166
 167         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 168         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 169                 map_lapic_id(header, acpi_id, &apic_id);
 170         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 171                 map_lsapic_id(header, type, acpi_id, &apic_id);
 172         }
 173
 174 exit:
 175         if (buffer.pointer)
 176                 kfree(buffer.pointer);
 177         return apic_id;
 178 }
 179
 180 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 181 {
 182         int i;
 183         int apic_id = -1;
 184
 185         apic_id = map_mat_entry(handle, type, acpi_id);
 186         if (apic_id == -1)
 187                 apic_id = map_madt_entry(type, acpi_id);
 188         if (apic_id == -1)
 189                 return apic_id;
 190
 191         for_each_possible_cpu(i) {
 192                 if (cpu_physical_id(i) == apic_id)
 193                         return i;
 194         }
 195         return -1;
 196 }
 197 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 198 #endif
 199
 200 static bool processor_physically_present(acpi_handle handle)
 201 {
 202         int cpuid, type;
 203         u32 acpi_id;
 204         acpi_status status;
 205         acpi_object_type acpi_type;
 206         unsigned long long tmp;
 207         union acpi_object object = { 0 };
 208         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 209
 210         status = acpi_get_type(handle, &acpi_type);
 211         if (ACPI_FAILURE(status))
 212                 return false;
 213
 214         switch (acpi_type) {
 215         case ACPI_TYPE_PROCESSOR:
 216                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
 217                 if (ACPI_FAILURE(status))
 218                         return false;
 219                 acpi_id = object.processor.proc_id;
 220                 break;
 221         case ACPI_TYPE_DEVICE:
 222                 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
 223                 if (ACPI_FAILURE(status))
 224                         return false;
 225                 acpi_id = tmp;
 226                 break;
 227         default:
 228                 return false;
 229         }
 230
 231         type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
 232         cpuid = acpi_get_cpuid(handle, type, acpi_id);
 233
 234         if (cpuid == -1)
 235                 return false;
 236
 237         return true;
 238 }
 239
 240 static void acpi_set_pdc_bits(u32 *buf)
 241 {
 242         buf[0] = ACPI_PDC_REVISION_ID;
 243         buf[1] = 1;
 244
 245         /* Enable coordination with firmware's _TSD info */
 246         buf[2] = ACPI_PDC_SMP_T_SWCOORD;
 247
 248         /* Twiddle arch-specific bits needed for _PDC */
 249         arch_acpi_set_pdc_bits(buf);
 250 }
 251
 252 static struct acpi_object_list *acpi_processor_alloc_pdc(void)
 253 {
 254         struct acpi_object_list *obj_list;
 255         union acpi_object *obj;
 256         u32 *buf;
 257
 258         /* allocate and initialize pdc. It will be used later. */
 259         obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
 260         if (!obj_list) {
 261                 printk(KERN_ERR "Memory allocation error\n");
 262                 return NULL;
 263         }
 264
 265         obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
 266         if (!obj) {
 267                 printk(KERN_ERR "Memory allocation error\n");
 268                 kfree(obj_list);
 269                 return NULL;
 270         }
 271
 272         buf = kmalloc(12, GFP_KERNEL);
 273         if (!buf) {
 274                 printk(KERN_ERR "Memory allocation error\n");
 275                 kfree(obj);
 276                 kfree(obj_list);
 277                 return NULL;
 278         }
 279
 280         acpi_set_pdc_bits(buf);
 281
 282         obj->type = ACPI_TYPE_BUFFER;
 283         obj->buffer.length = 12;
 284         obj->buffer.pointer = (u8 *) buf;
 285         obj_list->count = 1;
 286         obj_list->pointer = obj;
 287
 288         return obj_list;
 289 }
 290
 291 /*
 292  * _PDC is required for a BIOS-OS handshake for most of the newer
 293  * ACPI processor features.
 294  */
 295 static int
 296 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
 297 {
 298         acpi_status status = AE_OK;
 299
 300         if (idle_nomwait) {
 301                 /*
 302                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 303                  * mode will be disabled in the parameter of _PDC object.
 304                  * Of course C1_FFH access mode will also be disabled.
 305                  */
 306                 union acpi_object *obj;
 307                 u32 *buffer = NULL;
 308
 309                 obj = pdc_in->pointer;
 310                 buffer = (u32 *)(obj->buffer.pointer);
 311                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 312
 313         }
 314         status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
 315
 316         if (ACPI_FAILURE(status))
 317                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 318                     "Could not evaluate _PDC, using legacy perf. control.\n"));
 319
 320         return status;
 321 }
 322
 323 void acpi_processor_set_pdc(acpi_handle handle)
 324 {
 325         struct acpi_object_list *obj_list;
 326
 327         if (arch_has_acpi_pdc() == false)
 328                 return;
 329
 330         obj_list = acpi_processor_alloc_pdc();
 331         if (!obj_list)
 332                 return;
 333
 334         acpi_processor_eval_pdc(handle, obj_list);
 335
 336         kfree(obj_list->pointer->buffer.pointer);
 337         kfree(obj_list->pointer);
 338         kfree(obj_list);
 339 }
 340 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
 341
 342 static acpi_status
 343 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
 344 {
 345         if (processor_physically_present(handle) == false)
 346                 return AE_OK;
 347
 348         acpi_processor_set_pdc(handle);
 349         return AE_OK;
 350 }
 351
 352 void __init acpi_early_processor_set_pdc(void)
 353 {
 354
 355 #ifdef CONFIG_SMP
 356         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
 357                                 (struct acpi_table_header **)&madt)))
 358                 madt = NULL;
 359 #endif
 360
 361         /*
 362          * Check whether the system is DMI table. If yes, OSPM
 363          * should not use mwait for CPU-states.
 364          */
 365         dmi_check_system(processor_idle_dmi_table);
 366
 367         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 368                             ACPI_UINT32_MAX,
 369                             early_init_pdc, NULL, NULL, NULL);
 370 }