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 struct acpi_table_madt *madt;
48 static int map_lapic_id(struct acpi_subtable_header *entry,
49 u32 acpi_id, int *apic_id)
51 struct acpi_madt_local_apic *lapic =
52 (struct acpi_madt_local_apic *)entry;
54 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
57 if (lapic->processor_id != acpi_id)
64 static int map_x2apic_id(struct acpi_subtable_header *entry,
65 int device_declaration, u32 acpi_id, int *apic_id)
67 struct acpi_madt_local_x2apic *apic =
68 (struct acpi_madt_local_x2apic *)entry;
70 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
73 if (device_declaration && (apic->uid == acpi_id)) {
74 *apic_id = apic->local_apic_id;
81 static int map_lsapic_id(struct acpi_subtable_header *entry,
82 int device_declaration, u32 acpi_id, int *apic_id)
84 struct acpi_madt_local_sapic *lsapic =
85 (struct acpi_madt_local_sapic *)entry;
87 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
90 if (device_declaration) {
91 if ((entry->length < 16) || (lsapic->uid != acpi_id))
93 } else if (lsapic->processor_id != acpi_id)
96 *apic_id = (lsapic->id << 8) | lsapic->eid;
100 static int map_madt_entry(int type, u32 acpi_id)
102 unsigned long madt_end, entry;
108 entry = (unsigned long)madt;
109 madt_end = entry + madt->header.length;
111 /* Parse all entries looking for a match. */
113 entry += sizeof(struct acpi_table_madt);
114 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
115 struct acpi_subtable_header *header =
116 (struct acpi_subtable_header *)entry;
117 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
118 if (map_lapic_id(header, acpi_id, &apic_id))
120 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
121 if (map_x2apic_id(header, type, acpi_id, &apic_id))
123 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
124 if (map_lsapic_id(header, type, acpi_id, &apic_id))
127 entry += header->length;
132 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
134 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
135 union acpi_object *obj;
136 struct acpi_subtable_header *header;
139 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
142 if (!buffer.length || !buffer.pointer)
145 obj = buffer.pointer;
146 if (obj->type != ACPI_TYPE_BUFFER ||
147 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
151 header = (struct acpi_subtable_header *)obj->buffer.pointer;
152 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
153 map_lapic_id(header, acpi_id, &apic_id);
154 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
155 map_lsapic_id(header, type, acpi_id, &apic_id);
160 kfree(buffer.pointer);
164 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
169 apic_id = map_mat_entry(handle, type, acpi_id);
171 apic_id = map_madt_entry(type, acpi_id);
175 for_each_possible_cpu(i) {
176 if (cpu_physical_id(i) == apic_id)
181 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
184 static bool processor_physically_present(acpi_handle handle)
189 acpi_object_type acpi_type;
190 unsigned long long tmp;
191 union acpi_object object = { 0 };
192 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
194 status = acpi_get_type(handle, &acpi_type);
195 if (ACPI_FAILURE(status))
199 case ACPI_TYPE_PROCESSOR:
200 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
201 if (ACPI_FAILURE(status))
203 acpi_id = object.processor.proc_id;
205 case ACPI_TYPE_DEVICE:
206 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
207 if (ACPI_FAILURE(status))
215 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
216 cpuid = acpi_get_cpuid(handle, type, acpi_id);
224 static void acpi_set_pdc_bits(u32 *buf)
226 buf[0] = ACPI_PDC_REVISION_ID;
229 /* Enable coordination with firmware's _TSD info */
230 buf[2] = ACPI_PDC_SMP_T_SWCOORD;
232 /* Twiddle arch-specific bits needed for _PDC */
233 arch_acpi_set_pdc_bits(buf);
236 static struct acpi_object_list *acpi_processor_alloc_pdc(void)
238 struct acpi_object_list *obj_list;
239 union acpi_object *obj;
242 /* allocate and initialize pdc. It will be used later. */
243 obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
245 printk(KERN_ERR "Memory allocation error\n");
249 obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
251 printk(KERN_ERR "Memory allocation error\n");
256 buf = kmalloc(12, GFP_KERNEL);
258 printk(KERN_ERR "Memory allocation error\n");
264 acpi_set_pdc_bits(buf);
266 obj->type = ACPI_TYPE_BUFFER;
267 obj->buffer.length = 12;
268 obj->buffer.pointer = (u8 *) buf;
270 obj_list->pointer = obj;
276 * _PDC is required for a BIOS-OS handshake for most of the newer
277 * ACPI processor features.
280 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
282 acpi_status status = AE_OK;
286 * If mwait is disabled for CPU C-states, the C2C3_FFH access
287 * mode will be disabled in the parameter of _PDC object.
288 * Of course C1_FFH access mode will also be disabled.
290 union acpi_object *obj;
293 obj = pdc_in->pointer;
294 buffer = (u32 *)(obj->buffer.pointer);
295 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
298 status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
300 if (ACPI_FAILURE(status))
301 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
302 "Could not evaluate _PDC, using legacy perf. control.\n"));
307 void acpi_processor_set_pdc(acpi_handle handle)
309 struct acpi_object_list *obj_list;
311 if (arch_has_acpi_pdc() == false)
314 obj_list = acpi_processor_alloc_pdc();
318 acpi_processor_eval_pdc(handle, obj_list);
320 kfree(obj_list->pointer->buffer.pointer);
321 kfree(obj_list->pointer);
324 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
327 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
329 if (processor_physically_present(handle) == false)
332 acpi_processor_set_pdc(handle);
336 void __init acpi_early_processor_set_pdc(void)
340 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
341 (struct acpi_table_header **)&madt)))
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);