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         if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
  54             lapic->processor_id == acpi_id) {
  55                 *apic_id = lapic->id;
  56                 return 1;
  57         }
  58         return 0;
  59 }
  60
  61 static int map_x2apic_id(struct acpi_subtable_header *entry,
  62                          int device_declaration, u32 acpi_id, int *apic_id)
  63 {
  64         struct acpi_madt_local_x2apic *apic =
  65                 (struct acpi_madt_local_x2apic *)entry;
  66         u32 tmp = apic->local_apic_id;
  67
  68         /* Only check enabled APICs*/
  69         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
  70                 return 0;
  71
  72         /* Device statement declaration type */
  73         if (device_declaration) {
  74                 if (apic->uid == acpi_id)
  75                         goto found;
  76         }
  77
  78         return 0;
  79 found:
  80         *apic_id = tmp;
  81         return 1;
  82 }
  83
  84 static int map_lsapic_id(struct acpi_subtable_header *entry,
  85                 int device_declaration, u32 acpi_id, int *apic_id)
  86 {
  87         struct acpi_madt_local_sapic *lsapic =
  88                 (struct acpi_madt_local_sapic *)entry;
  89         u32 tmp = (lsapic->id << 8) | lsapic->eid;
  90
  91         /* Only check enabled APICs*/
  92         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
  93                 return 0;
  94
  95         /* Device statement declaration type */
  96         if (device_declaration) {
  97                 if (entry->length < 16)
  98                         printk(KERN_ERR PREFIX
  99                             "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
 100                             tmp);
 101                 else if (lsapic->uid == acpi_id)
 102                         goto found;
 103         /* Processor statement declaration type */
 104         } else if (lsapic->processor_id == acpi_id)
 105                 goto found;
 106
 107         return 0;
 108 found:
 109         *apic_id = tmp;
 110         return 1;
 111 }
 112
 113 static int map_madt_entry(int type, u32 acpi_id)
 114 {
 115         unsigned long madt_end, entry;
 116         int apic_id = -1;
 117
 118         if (!madt)
 119                 return apic_id;
 120
 121         entry = (unsigned long)madt;
 122         madt_end = entry + madt->header.length;
 123
 124         /* Parse all entries looking for a match. */
 125
 126         entry += sizeof(struct acpi_table_madt);
 127         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 128                 struct acpi_subtable_header *header =
 129                         (struct acpi_subtable_header *)entry;
 130                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 131                         if (map_lapic_id(header, acpi_id, &apic_id))
 132                                 break;
 133                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 134                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
 135                                 break;
 136                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 137                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
 138                                 break;
 139                 }
 140                 entry += header->length;
 141         }
 142         return apic_id;
 143 }
 144
 145 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 146 {
 147         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 148         union acpi_object *obj;
 149         struct acpi_subtable_header *header;
 150         int apic_id = -1;
 151
 152         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 153                 goto exit;
 154
 155         if (!buffer.length || !buffer.pointer)
 156                 goto exit;
 157
 158         obj = buffer.pointer;
 159         if (obj->type != ACPI_TYPE_BUFFER ||
 160             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
 161                 goto exit;
 162         }
 163
 164         header = (struct acpi_subtable_header *)obj->buffer.pointer;
 165         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 166                 map_lapic_id(header, acpi_id, &apic_id);
 167         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
 168                 map_lsapic_id(header, type, acpi_id, &apic_id);
 169         }
 170
 171 exit:
 172         if (buffer.pointer)
 173                 kfree(buffer.pointer);
 174         return apic_id;
 175 }
 176
 177 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 178 {
 179         int i;
 180         int apic_id = -1;
 181
 182         apic_id = map_mat_entry(handle, type, acpi_id);
 183         if (apic_id == -1)
 184                 apic_id = map_madt_entry(type, acpi_id);
 185         if (apic_id == -1)
 186                 return apic_id;
 187
 188         for_each_possible_cpu(i) {
 189                 if (cpu_physical_id(i) == apic_id)
 190                         return i;
 191         }
 192         return -1;
 193 }
 194 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 195 #endif
 196
 197 static bool processor_physically_present(acpi_handle handle)
 198 {
 199         int cpuid, type;
 200         u32 acpi_id;
 201         acpi_status status;
 202         acpi_object_type acpi_type;
 203         unsigned long long tmp;
 204         union acpi_object object = { 0 };
 205         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
 206
 207         status = acpi_get_type(handle, &acpi_type);
 208         if (ACPI_FAILURE(status))
 209                 return false;
 210
 211         switch (acpi_type) {
 212         case ACPI_TYPE_PROCESSOR:
 213                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
 214                 if (ACPI_FAILURE(status))
 215                         return false;
 216                 acpi_id = object.processor.proc_id;
 217                 break;
 218         case ACPI_TYPE_DEVICE:
 219                 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
 220                 if (ACPI_FAILURE(status))
 221                         return false;
 222                 acpi_id = tmp;
 223                 break;
 224         default:
 225                 return false;
 226         }
 227
 228         type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
 229         cpuid = acpi_get_cpuid(handle, type, acpi_id);
 230
 231         if (cpuid == -1)
 232                 return false;
 233
 234         return true;
 235 }
 236
 237 static void acpi_set_pdc_bits(u32 *buf)
 238 {
 239         buf[0] = ACPI_PDC_REVISION_ID;
 240         buf[1] = 1;
 241
 242         /* Enable coordination with firmware's _TSD info */
 243         buf[2] = ACPI_PDC_SMP_T_SWCOORD;
 244
 245         /* Twiddle arch-specific bits needed for _PDC */
 246         arch_acpi_set_pdc_bits(buf);
 247 }
 248
 249 static struct acpi_object_list *acpi_processor_alloc_pdc(void)
 250 {
 251         struct acpi_object_list *obj_list;
 252         union acpi_object *obj;
 253         u32 *buf;
 254
 255         /* allocate and initialize pdc. It will be used later. */
 256         obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
 257         if (!obj_list) {
 258                 printk(KERN_ERR "Memory allocation error\n");
 259                 return NULL;
 260         }
 261
 262         obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
 263         if (!obj) {
 264                 printk(KERN_ERR "Memory allocation error\n");
 265                 kfree(obj_list);
 266                 return NULL;
 267         }
 268
 269         buf = kmalloc(12, GFP_KERNEL);
 270         if (!buf) {
 271                 printk(KERN_ERR "Memory allocation error\n");
 272                 kfree(obj);
 273                 kfree(obj_list);
 274                 return NULL;
 275         }
 276
 277         acpi_set_pdc_bits(buf);
 278
 279         obj->type = ACPI_TYPE_BUFFER;
 280         obj->buffer.length = 12;
 281         obj->buffer.pointer = (u8 *) buf;
 282         obj_list->count = 1;
 283         obj_list->pointer = obj;
 284
 285         return obj_list;
 286 }
 287
 288 /*
 289  * _PDC is required for a BIOS-OS handshake for most of the newer
 290  * ACPI processor features.
 291  */
 292 static int
 293 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
 294 {
 295         acpi_status status = AE_OK;
 296
 297         if (idle_nomwait) {
 298                 /*
 299                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
 300                  * mode will be disabled in the parameter of _PDC object.
 301                  * Of course C1_FFH access mode will also be disabled.
 302                  */
 303                 union acpi_object *obj;
 304                 u32 *buffer = NULL;
 305
 306                 obj = pdc_in->pointer;
 307                 buffer = (u32 *)(obj->buffer.pointer);
 308                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
 309
 310         }
 311         status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
 312
 313         if (ACPI_FAILURE(status))
 314                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 315                     "Could not evaluate _PDC, using legacy perf. control.\n"));
 316
 317         return status;
 318 }
 319
 320 static int early_pdc_done;
 321
 322 void acpi_processor_set_pdc(acpi_handle handle)
 323 {
 324         struct acpi_object_list *obj_list;
 325
 326         if (arch_has_acpi_pdc() == false)
 327                 return;
 328
 329         if (early_pdc_done)
 330                 return;
 331
 332         obj_list = acpi_processor_alloc_pdc();
 333         if (!obj_list)
 334                 return;
 335
 336         acpi_processor_eval_pdc(handle, obj_list);
 337
 338         kfree(obj_list->pointer->buffer.pointer);
 339         kfree(obj_list->pointer);
 340         kfree(obj_list);
 341 }
 342 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
 343
 344 static acpi_status
 345 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
 346 {
 347         if (processor_physically_present(handle) == false)
 348                 return AE_OK;
 349
 350         acpi_processor_set_pdc(handle);
 351         return AE_OK;
 352 }
 353
 354 void __init acpi_early_processor_set_pdc(void)
 355 {
 356
 357 #ifdef CONFIG_SMP
 358         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
 359                                 (struct acpi_table_header **)&madt)))
 360                 madt = NULL;
 361 #endif
 362
 363         /*
 364          * Check whether the system is DMI table. If yes, OSPM
 365          * should not use mwait for CPU-states.
 366          */
 367         dmi_check_system(processor_idle_dmi_table);
 368
 369         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
 370                             ACPI_UINT32_MAX,
 371                             early_init_pdc, NULL, NULL, NULL);
 372
 373         early_pdc_done = 1;
 374 }