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 #include <linux/slab.h> 12 13 #include <acpi/acpi_drivers.h> 14 #include <acpi/processor.h> 15 16 #include "internal.h" 17 18 #define PREFIX "ACPI: " 19 #define _COMPONENT ACPI_PROCESSOR_COMPONENT 20 ACPI_MODULE_NAME("processor_core"); 21 22 static int set_no_mwait(const struct dmi_system_id *id) 23 { 24 printk(KERN_NOTICE PREFIX "%s detected - " 25 "disabling mwait for CPU C-states\n", id->ident); 26 idle_nomwait = 1; 27 return 0; 28 } 29 30 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = { 31 { 32 set_no_mwait, "Extensa 5220", { 33 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 34 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 35 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), 36 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, 37 {}, 38 }; 39 40 #ifdef CONFIG_SMP 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 int i; 169 int apic_id = -1; 170 171 apic_id = map_mat_entry(handle, type, acpi_id); 172 if (apic_id == -1) 173 apic_id = map_madt_entry(type, acpi_id); 174 if (apic_id == -1) 175 return apic_id; 176 177 for_each_possible_cpu(i) { 178 if (cpu_physical_id(i) == apic_id) 179 return i; 180 } 181 return -1; 182 } 183 EXPORT_SYMBOL_GPL(acpi_get_cpuid); 184 #endif 185 186 static bool processor_physically_present(acpi_handle handle) 187 { 188 int cpuid, type; 189 u32 acpi_id; 190 acpi_status status; 191 acpi_object_type acpi_type; 192 unsigned long long tmp; 193 union acpi_object object = { 0 }; 194 struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; 195 196 status = acpi_get_type(handle, &acpi_type); 197 if (ACPI_FAILURE(status)) 198 return false; 199 200 switch (acpi_type) { 201 case ACPI_TYPE_PROCESSOR: 202 status = acpi_evaluate_object(handle, NULL, NULL, &buffer); 203 if (ACPI_FAILURE(status)) 204 return false; 205 acpi_id = object.processor.proc_id; 206 break; 207 case ACPI_TYPE_DEVICE: 208 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); 209 if (ACPI_FAILURE(status)) 210 return false; 211 acpi_id = tmp; 212 break; 213 default: 214 return false; 215 } 216 217 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; 218 cpuid = acpi_get_cpuid(handle, type, acpi_id); 219 220 if ((cpuid == -1) && (num_possible_cpus() > 1)) 221 return false; 222 223 return true; 224 } 225 226 static void acpi_set_pdc_bits(u32 *buf) 227 { 228 buf[0] = ACPI_PDC_REVISION_ID; 229 buf[1] = 1; 230 231 /* Enable coordination with firmware's _TSD info */ 232 buf[2] = ACPI_PDC_SMP_T_SWCOORD; 233 234 /* Twiddle arch-specific bits needed for _PDC */ 235 arch_acpi_set_pdc_bits(buf); 236 } 237 238 static struct acpi_object_list *acpi_processor_alloc_pdc(void) 239 { 240 struct acpi_object_list *obj_list; 241 union acpi_object *obj; 242 u32 *buf; 243 244 /* allocate and initialize pdc. It will be used later. */ 245 obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); 246 if (!obj_list) { 247 printk(KERN_ERR "Memory allocation error\n"); 248 return NULL; 249 } 250 251 obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); 252 if (!obj) { 253 printk(KERN_ERR "Memory allocation error\n"); 254 kfree(obj_list); 255 return NULL; 256 } 257 258 buf = kmalloc(12, GFP_KERNEL); 259 if (!buf) { 260 printk(KERN_ERR "Memory allocation error\n"); 261 kfree(obj); 262 kfree(obj_list); 263 return NULL; 264 } 265 266 acpi_set_pdc_bits(buf); 267 268 obj->type = ACPI_TYPE_BUFFER; 269 obj->buffer.length = 12; 270 obj->buffer.pointer = (u8 *) buf; 271 obj_list->count = 1; 272 obj_list->pointer = obj; 273 274 return obj_list; 275 } 276 277 /* 278 * _PDC is required for a BIOS-OS handshake for most of the newer 279 * ACPI processor features. 280 */ 281 static int 282 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) 283 { 284 acpi_status status = AE_OK; 285 286 if (idle_nomwait) { 287 /* 288 * If mwait is disabled for CPU C-states, the C2C3_FFH access 289 * mode will be disabled in the parameter of _PDC object. 290 * Of course C1_FFH access mode will also be disabled. 291 */ 292 union acpi_object *obj; 293 u32 *buffer = NULL; 294 295 obj = pdc_in->pointer; 296 buffer = (u32 *)(obj->buffer.pointer); 297 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); 298 299 } 300 status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); 301 302 if (ACPI_FAILURE(status)) 303 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 304 "Could not evaluate _PDC, using legacy perf. control.\n")); 305 306 return status; 307 } 308 309 void acpi_processor_set_pdc(acpi_handle handle) 310 { 311 struct acpi_object_list *obj_list; 312 313 if (arch_has_acpi_pdc() == false) 314 return; 315 316 obj_list = acpi_processor_alloc_pdc(); 317 if (!obj_list) 318 return; 319 320 acpi_processor_eval_pdc(handle, obj_list); 321 322 kfree(obj_list->pointer->buffer.pointer); 323 kfree(obj_list->pointer); 324 kfree(obj_list); 325 } 326 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc); 327 328 static acpi_status 329 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) 330 { 331 if (processor_physically_present(handle) == false) 332 return AE_OK; 333 334 acpi_processor_set_pdc(handle); 335 return AE_OK; 336 } 337 338 void __init acpi_early_processor_set_pdc(void) 339 { 340 /* 341 * Check whether the system is DMI table. If yes, OSPM 342 * should not use mwait for CPU-states. 343 */ 344 dmi_check_system(processor_idle_dmi_table); 345 346 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, 347 ACPI_UINT32_MAX, 348 early_init_pdc, NULL, NULL, NULL); 349 acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL); 350 } 351