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