2 * Copyright (C) 2005 Intel Corporation
3 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
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
10 #include <linux/dmi.h>
12 #include <acpi/acpi_drivers.h>
13 #include <acpi/processor.h>
17 #define PREFIX "ACPI: "
18 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
19 ACPI_MODULE_NAME("processor_core");
21 static int set_no_mwait(const struct dmi_system_id *id)
23 printk(KERN_NOTICE PREFIX "%s detected - "
24 "disabling mwait for CPU C-states\n", id->ident);
29 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
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},
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},
46 static int map_lapic_id(struct acpi_subtable_header *entry,
47 u32 acpi_id, int *apic_id)
49 struct acpi_madt_local_apic *lapic =
50 (struct acpi_madt_local_apic *)entry;
52 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
55 if (lapic->processor_id != acpi_id)
62 static int map_x2apic_id(struct acpi_subtable_header *entry,
63 int device_declaration, u32 acpi_id, int *apic_id)
65 struct acpi_madt_local_x2apic *apic =
66 (struct acpi_madt_local_x2apic *)entry;
68 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
71 if (device_declaration && (apic->uid == acpi_id)) {
72 *apic_id = apic->local_apic_id;
79 static int map_lsapic_id(struct acpi_subtable_header *entry,
80 int device_declaration, u32 acpi_id, int *apic_id)
82 struct acpi_madt_local_sapic *lsapic =
83 (struct acpi_madt_local_sapic *)entry;
85 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
88 if (device_declaration) {
89 if ((entry->length < 16) || (lsapic->uid != acpi_id))
91 } else if (lsapic->processor_id != acpi_id)
94 *apic_id = (lsapic->id << 8) | lsapic->eid;
98 static int map_madt_entry(int type, u32 acpi_id)
100 unsigned long madt_end, entry;
101 static struct acpi_table_madt *madt;
102 static int read_madt;
106 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
107 (struct acpi_table_header **)&madt)))
115 entry = (unsigned long)madt;
116 madt_end = entry + madt->header.length;
118 /* Parse all entries looking for a match. */
120 entry += sizeof(struct acpi_table_madt);
121 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
122 struct acpi_subtable_header *header =
123 (struct acpi_subtable_header *)entry;
124 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
125 if (map_lapic_id(header, acpi_id, &apic_id))
127 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
128 if (map_x2apic_id(header, type, acpi_id, &apic_id))
130 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
131 if (map_lsapic_id(header, type, acpi_id, &apic_id))
134 entry += header->length;
139 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
141 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
142 union acpi_object *obj;
143 struct acpi_subtable_header *header;
146 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
149 if (!buffer.length || !buffer.pointer)
152 obj = buffer.pointer;
153 if (obj->type != ACPI_TYPE_BUFFER ||
154 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
158 header = (struct acpi_subtable_header *)obj->buffer.pointer;
159 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
160 map_lapic_id(header, acpi_id, &apic_id);
161 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
162 map_lsapic_id(header, type, acpi_id, &apic_id);
167 kfree(buffer.pointer);
171 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
176 apic_id = map_mat_entry(handle, type, acpi_id);
178 apic_id = map_madt_entry(type, acpi_id);
182 for_each_possible_cpu(i) {
183 if (cpu_physical_id(i) == apic_id)
188 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
191 static bool processor_physically_present(acpi_handle handle)
196 acpi_object_type acpi_type;
197 unsigned long long tmp;
198 union acpi_object object = { 0 };
199 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
201 status = acpi_get_type(handle, &acpi_type);
202 if (ACPI_FAILURE(status))
206 case ACPI_TYPE_PROCESSOR:
207 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
208 if (ACPI_FAILURE(status))
210 acpi_id = object.processor.proc_id;
212 case ACPI_TYPE_DEVICE:
213 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
214 if (ACPI_FAILURE(status))
222 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
223 cpuid = acpi_get_cpuid(handle, type, acpi_id);
231 static void acpi_set_pdc_bits(u32 *buf)
233 buf[0] = ACPI_PDC_REVISION_ID;
236 /* Enable coordination with firmware's _TSD info */
237 buf[2] = ACPI_PDC_SMP_T_SWCOORD;
239 /* Twiddle arch-specific bits needed for _PDC */
240 arch_acpi_set_pdc_bits(buf);
243 static struct acpi_object_list *acpi_processor_alloc_pdc(void)
245 struct acpi_object_list *obj_list;
246 union acpi_object *obj;
249 /* allocate and initialize pdc. It will be used later. */
250 obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
252 printk(KERN_ERR "Memory allocation error\n");
256 obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
258 printk(KERN_ERR "Memory allocation error\n");
263 buf = kmalloc(12, GFP_KERNEL);
265 printk(KERN_ERR "Memory allocation error\n");
271 acpi_set_pdc_bits(buf);
273 obj->type = ACPI_TYPE_BUFFER;
274 obj->buffer.length = 12;
275 obj->buffer.pointer = (u8 *) buf;
277 obj_list->pointer = obj;
283 * _PDC is required for a BIOS-OS handshake for most of the newer
284 * ACPI processor features.
287 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
289 acpi_status status = AE_OK;
293 * If mwait is disabled for CPU C-states, the C2C3_FFH access
294 * mode will be disabled in the parameter of _PDC object.
295 * Of course C1_FFH access mode will also be disabled.
297 union acpi_object *obj;
300 obj = pdc_in->pointer;
301 buffer = (u32 *)(obj->buffer.pointer);
302 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
305 status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
307 if (ACPI_FAILURE(status))
308 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
309 "Could not evaluate _PDC, using legacy perf. control.\n"));
314 void acpi_processor_set_pdc(acpi_handle handle)
316 struct acpi_object_list *obj_list;
318 if (arch_has_acpi_pdc() == false)
321 obj_list = acpi_processor_alloc_pdc();
325 acpi_processor_eval_pdc(handle, obj_list);
327 kfree(obj_list->pointer->buffer.pointer);
328 kfree(obj_list->pointer);
331 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
334 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
336 if (processor_physically_present(handle) == false)
339 acpi_processor_set_pdc(handle);
343 void __init acpi_early_processor_set_pdc(void)
346 * Check whether the system is DMI table. If yes, OSPM
347 * should not use mwait for CPU-states.
349 dmi_check_system(processor_idle_dmi_table);
351 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
353 early_init_pdc, NULL, NULL, NULL);