| 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/export.h> |
| 11 | #include <linux/dmi.h> |
| 12 | #include <linux/slab.h> |
| 13 | |
| 14 | #include <acpi/acpi_drivers.h> |
| 15 | #include <acpi/processor.h> |
| 16 | |
| 17 | #include "internal.h" |
| 18 | |
| 19 | #define PREFIX "ACPI: " |
| 20 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
| 21 | ACPI_MODULE_NAME("processor_core"); |
| 22 | |
| 23 | static int __init set_no_mwait(const struct dmi_system_id *id) |
| 24 | { |
| 25 | printk(KERN_NOTICE PREFIX "%s detected - " |
| 26 | "disabling mwait for CPU C-states\n", id->ident); |
| 27 | boot_option_idle_override = IDLE_NOMWAIT; |
| 28 | return 0; |
| 29 | } |
| 30 | |
| 31 | static struct dmi_system_id __initdata processor_idle_dmi_table[] = { |
| 32 | { |
| 33 | set_no_mwait, "Extensa 5220", { |
| 34 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), |
| 35 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
| 36 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), |
| 37 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, |
| 38 | {}, |
| 39 | }; |
| 40 | |
| 41 | static int map_lapic_id(struct acpi_subtable_header *entry, |
| 42 | u32 acpi_id, int *apic_id) |
| 43 | { |
| 44 | struct acpi_madt_local_apic *lapic = |
| 45 | (struct acpi_madt_local_apic *)entry; |
| 46 | |
| 47 | if (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) |
| 48 | return 0; |
| 49 | |
| 50 | if (lapic->processor_id != acpi_id) |
| 51 | return 0; |
| 52 | |
| 53 | *apic_id = lapic->id; |
| 54 | return 1; |
| 55 | } |
| 56 | |
| 57 | static int map_x2apic_id(struct acpi_subtable_header *entry, |
| 58 | int device_declaration, u32 acpi_id, int *apic_id) |
| 59 | { |
| 60 | struct acpi_madt_local_x2apic *apic = |
| 61 | (struct acpi_madt_local_x2apic *)entry; |
| 62 | |
| 63 | if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) |
| 64 | return 0; |
| 65 | |
| 66 | if (device_declaration && (apic->uid == acpi_id)) { |
| 67 | *apic_id = apic->local_apic_id; |
| 68 | return 1; |
| 69 | } |
| 70 | |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static int map_lsapic_id(struct acpi_subtable_header *entry, |
| 75 | int device_declaration, u32 acpi_id, int *apic_id) |
| 76 | { |
| 77 | struct acpi_madt_local_sapic *lsapic = |
| 78 | (struct acpi_madt_local_sapic *)entry; |
| 79 | |
| 80 | if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) |
| 81 | return 0; |
| 82 | |
| 83 | if (device_declaration) { |
| 84 | if ((entry->length < 16) || (lsapic->uid != acpi_id)) |
| 85 | return 0; |
| 86 | } else if (lsapic->processor_id != acpi_id) |
| 87 | return 0; |
| 88 | |
| 89 | *apic_id = (lsapic->id << 8) | lsapic->eid; |
| 90 | return 1; |
| 91 | } |
| 92 | |
| 93 | static int map_madt_entry(int type, u32 acpi_id) |
| 94 | { |
| 95 | unsigned long madt_end, entry; |
| 96 | static struct acpi_table_madt *madt; |
| 97 | static int read_madt; |
| 98 | int apic_id = -1; |
| 99 | |
| 100 | if (!read_madt) { |
| 101 | if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, |
| 102 | (struct acpi_table_header **)&madt))) |
| 103 | madt = NULL; |
| 104 | read_madt++; |
| 105 | } |
| 106 | |
| 107 | if (!madt) |
| 108 | return apic_id; |
| 109 | |
| 110 | entry = (unsigned long)madt; |
| 111 | madt_end = entry + madt->header.length; |
| 112 | |
| 113 | /* Parse all entries looking for a match. */ |
| 114 | |
| 115 | entry += sizeof(struct acpi_table_madt); |
| 116 | while (entry + sizeof(struct acpi_subtable_header) < madt_end) { |
| 117 | struct acpi_subtable_header *header = |
| 118 | (struct acpi_subtable_header *)entry; |
| 119 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { |
| 120 | if (map_lapic_id(header, acpi_id, &apic_id)) |
| 121 | break; |
| 122 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { |
| 123 | if (map_x2apic_id(header, type, acpi_id, &apic_id)) |
| 124 | break; |
| 125 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { |
| 126 | if (map_lsapic_id(header, type, acpi_id, &apic_id)) |
| 127 | break; |
| 128 | } |
| 129 | entry += header->length; |
| 130 | } |
| 131 | return apic_id; |
| 132 | } |
| 133 | |
| 134 | static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) |
| 135 | { |
| 136 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 137 | union acpi_object *obj; |
| 138 | struct acpi_subtable_header *header; |
| 139 | int apic_id = -1; |
| 140 | |
| 141 | if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) |
| 142 | goto exit; |
| 143 | |
| 144 | if (!buffer.length || !buffer.pointer) |
| 145 | goto exit; |
| 146 | |
| 147 | obj = buffer.pointer; |
| 148 | if (obj->type != ACPI_TYPE_BUFFER || |
| 149 | obj->buffer.length < sizeof(struct acpi_subtable_header)) { |
| 150 | goto exit; |
| 151 | } |
| 152 | |
| 153 | header = (struct acpi_subtable_header *)obj->buffer.pointer; |
| 154 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { |
| 155 | map_lapic_id(header, acpi_id, &apic_id); |
| 156 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { |
| 157 | map_lsapic_id(header, type, acpi_id, &apic_id); |
| 158 | } |
| 159 | |
| 160 | exit: |
| 161 | if (buffer.pointer) |
| 162 | kfree(buffer.pointer); |
| 163 | return apic_id; |
| 164 | } |
| 165 | |
| 166 | int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) |
| 167 | { |
| 168 | #ifdef CONFIG_SMP |
| 169 | int i; |
| 170 | #endif |
| 171 | int apic_id = -1; |
| 172 | |
| 173 | apic_id = map_mat_entry(handle, type, acpi_id); |
| 174 | if (apic_id == -1) |
| 175 | apic_id = map_madt_entry(type, acpi_id); |
| 176 | if (apic_id == -1) { |
| 177 | /* |
| 178 | * On UP processor, there is no _MAT or MADT table. |
| 179 | * So above apic_id is always set to -1. |
| 180 | * |
| 181 | * BIOS may define multiple CPU handles even for UP processor. |
| 182 | * For example, |
| 183 | * |
| 184 | * Scope (_PR) |
| 185 | * { |
| 186 | * Processor (CPU0, 0x00, 0x00000410, 0x06) {} |
| 187 | * Processor (CPU1, 0x01, 0x00000410, 0x06) {} |
| 188 | * Processor (CPU2, 0x02, 0x00000410, 0x06) {} |
| 189 | * Processor (CPU3, 0x03, 0x00000410, 0x06) {} |
| 190 | * } |
| 191 | * |
| 192 | * Ignores apic_id and always returns 0 for the processor |
| 193 | * handle with acpi id 0 if nr_cpu_ids is 1. |
| 194 | * This should be the case if SMP tables are not found. |
| 195 | * Return -1 for other CPU's handle. |
| 196 | */ |
| 197 | if (nr_cpu_ids <= 1 && acpi_id == 0) |
| 198 | return acpi_id; |
| 199 | else |
| 200 | return apic_id; |
| 201 | } |
| 202 | |
| 203 | #ifdef CONFIG_SMP |
| 204 | for_each_possible_cpu(i) { |
| 205 | if (cpu_physical_id(i) == apic_id) |
| 206 | return i; |
| 207 | } |
| 208 | #else |
| 209 | /* In UP kernel, only processor 0 is valid */ |
| 210 | if (apic_id == 0) |
| 211 | return apic_id; |
| 212 | #endif |
| 213 | return -1; |
| 214 | } |
| 215 | EXPORT_SYMBOL_GPL(acpi_get_cpuid); |
| 216 | |
| 217 | static bool __init processor_physically_present(acpi_handle handle) |
| 218 | { |
| 219 | int cpuid, type; |
| 220 | u32 acpi_id; |
| 221 | acpi_status status; |
| 222 | acpi_object_type acpi_type; |
| 223 | unsigned long long tmp; |
| 224 | union acpi_object object = { 0 }; |
| 225 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; |
| 226 | |
| 227 | status = acpi_get_type(handle, &acpi_type); |
| 228 | if (ACPI_FAILURE(status)) |
| 229 | return false; |
| 230 | |
| 231 | switch (acpi_type) { |
| 232 | case ACPI_TYPE_PROCESSOR: |
| 233 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); |
| 234 | if (ACPI_FAILURE(status)) |
| 235 | return false; |
| 236 | acpi_id = object.processor.proc_id; |
| 237 | break; |
| 238 | case ACPI_TYPE_DEVICE: |
| 239 | status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); |
| 240 | if (ACPI_FAILURE(status)) |
| 241 | return false; |
| 242 | acpi_id = tmp; |
| 243 | break; |
| 244 | default: |
| 245 | return false; |
| 246 | } |
| 247 | |
| 248 | type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; |
| 249 | cpuid = acpi_get_cpuid(handle, type, acpi_id); |
| 250 | |
| 251 | if (cpuid == -1) |
| 252 | return false; |
| 253 | |
| 254 | return true; |
| 255 | } |
| 256 | |
| 257 | static void __cpuinit acpi_set_pdc_bits(u32 *buf) |
| 258 | { |
| 259 | buf[0] = ACPI_PDC_REVISION_ID; |
| 260 | buf[1] = 1; |
| 261 | |
| 262 | /* Enable coordination with firmware's _TSD info */ |
| 263 | buf[2] = ACPI_PDC_SMP_T_SWCOORD; |
| 264 | |
| 265 | /* Twiddle arch-specific bits needed for _PDC */ |
| 266 | arch_acpi_set_pdc_bits(buf); |
| 267 | } |
| 268 | |
| 269 | static struct acpi_object_list *__cpuinit acpi_processor_alloc_pdc(void) |
| 270 | { |
| 271 | struct acpi_object_list *obj_list; |
| 272 | union acpi_object *obj; |
| 273 | u32 *buf; |
| 274 | |
| 275 | /* allocate and initialize pdc. It will be used later. */ |
| 276 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); |
| 277 | if (!obj_list) { |
| 278 | printk(KERN_ERR "Memory allocation error\n"); |
| 279 | return NULL; |
| 280 | } |
| 281 | |
| 282 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); |
| 283 | if (!obj) { |
| 284 | printk(KERN_ERR "Memory allocation error\n"); |
| 285 | kfree(obj_list); |
| 286 | return NULL; |
| 287 | } |
| 288 | |
| 289 | buf = kmalloc(12, GFP_KERNEL); |
| 290 | if (!buf) { |
| 291 | printk(KERN_ERR "Memory allocation error\n"); |
| 292 | kfree(obj); |
| 293 | kfree(obj_list); |
| 294 | return NULL; |
| 295 | } |
| 296 | |
| 297 | acpi_set_pdc_bits(buf); |
| 298 | |
| 299 | obj->type = ACPI_TYPE_BUFFER; |
| 300 | obj->buffer.length = 12; |
| 301 | obj->buffer.pointer = (u8 *) buf; |
| 302 | obj_list->count = 1; |
| 303 | obj_list->pointer = obj; |
| 304 | |
| 305 | return obj_list; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * _PDC is required for a BIOS-OS handshake for most of the newer |
| 310 | * ACPI processor features. |
| 311 | */ |
| 312 | static int __cpuinit |
| 313 | acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) |
| 314 | { |
| 315 | acpi_status status = AE_OK; |
| 316 | |
| 317 | if (boot_option_idle_override == IDLE_NOMWAIT) { |
| 318 | /* |
| 319 | * If mwait is disabled for CPU C-states, the C2C3_FFH access |
| 320 | * mode will be disabled in the parameter of _PDC object. |
| 321 | * Of course C1_FFH access mode will also be disabled. |
| 322 | */ |
| 323 | union acpi_object *obj; |
| 324 | u32 *buffer = NULL; |
| 325 | |
| 326 | obj = pdc_in->pointer; |
| 327 | buffer = (u32 *)(obj->buffer.pointer); |
| 328 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); |
| 329 | |
| 330 | } |
| 331 | status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); |
| 332 | |
| 333 | if (ACPI_FAILURE(status)) |
| 334 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 335 | "Could not evaluate _PDC, using legacy perf. control.\n")); |
| 336 | |
| 337 | return status; |
| 338 | } |
| 339 | |
| 340 | void __cpuinit acpi_processor_set_pdc(acpi_handle handle) |
| 341 | { |
| 342 | struct acpi_object_list *obj_list; |
| 343 | |
| 344 | if (arch_has_acpi_pdc() == false) |
| 345 | return; |
| 346 | |
| 347 | obj_list = acpi_processor_alloc_pdc(); |
| 348 | if (!obj_list) |
| 349 | return; |
| 350 | |
| 351 | acpi_processor_eval_pdc(handle, obj_list); |
| 352 | |
| 353 | kfree(obj_list->pointer->buffer.pointer); |
| 354 | kfree(obj_list->pointer); |
| 355 | kfree(obj_list); |
| 356 | } |
| 357 | |
| 358 | static acpi_status __init |
| 359 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) |
| 360 | { |
| 361 | if (processor_physically_present(handle) == false) |
| 362 | return AE_OK; |
| 363 | |
| 364 | acpi_processor_set_pdc(handle); |
| 365 | return AE_OK; |
| 366 | } |
| 367 | |
| 368 | void __init acpi_early_processor_set_pdc(void) |
| 369 | { |
| 370 | /* |
| 371 | * Check whether the system is DMI table. If yes, OSPM |
| 372 | * should not use mwait for CPU-states. |
| 373 | */ |
| 374 | dmi_check_system(processor_idle_dmi_table); |
| 375 | |
| 376 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, |
| 377 | ACPI_UINT32_MAX, |
| 378 | early_init_pdc, NULL, NULL, NULL); |
| 379 | acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL); |
| 380 | } |