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;
53 if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
54 lapic->processor_id == acpi_id) {
61 static int map_x2apic_id(struct acpi_subtable_header *entry,
62 int device_declaration, u32 acpi_id, int *apic_id)
64 struct acpi_madt_local_x2apic *apic =
65 (struct acpi_madt_local_x2apic *)entry;
66 u32 tmp = apic->local_apic_id;
68 /* Only check enabled APICs*/
69 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
72 /* Device statement declaration type */
73 if (device_declaration) {
74 if (apic->uid == acpi_id)
84 static int map_lsapic_id(struct acpi_subtable_header *entry,
85 int device_declaration, u32 acpi_id, int *apic_id)
87 struct acpi_madt_local_sapic *lsapic =
88 (struct acpi_madt_local_sapic *)entry;
89 u32 tmp = (lsapic->id << 8) | lsapic->eid;
91 /* Only check enabled APICs*/
92 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
95 /* Device statement declaration type */
96 if (device_declaration) {
97 if (entry->length < 16)
98 printk(KERN_ERR PREFIX
99 "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
101 else if (lsapic->uid == acpi_id)
103 /* Processor statement declaration type */
104 } else if (lsapic->processor_id == acpi_id)
113 static int map_madt_entry(int type, u32 acpi_id)
115 unsigned long madt_end, entry;
121 entry = (unsigned long)madt;
122 madt_end = entry + madt->header.length;
124 /* Parse all entries looking for a match. */
126 entry += sizeof(struct acpi_table_madt);
127 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
128 struct acpi_subtable_header *header =
129 (struct acpi_subtable_header *)entry;
130 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
131 if (map_lapic_id(header, acpi_id, &apic_id))
133 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
134 if (map_x2apic_id(header, type, acpi_id, &apic_id))
136 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
137 if (map_lsapic_id(header, type, acpi_id, &apic_id))
140 entry += header->length;
145 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
147 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
148 union acpi_object *obj;
149 struct acpi_subtable_header *header;
152 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
155 if (!buffer.length || !buffer.pointer)
158 obj = buffer.pointer;
159 if (obj->type != ACPI_TYPE_BUFFER ||
160 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
164 header = (struct acpi_subtable_header *)obj->buffer.pointer;
165 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
166 map_lapic_id(header, acpi_id, &apic_id);
167 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
168 map_lsapic_id(header, type, acpi_id, &apic_id);
173 kfree(buffer.pointer);
177 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
182 apic_id = map_mat_entry(handle, type, acpi_id);
184 apic_id = map_madt_entry(type, acpi_id);
188 for_each_possible_cpu(i) {
189 if (cpu_physical_id(i) == apic_id)
194 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
198 static void acpi_set_pdc_bits(u32 *buf)
200 buf[0] = ACPI_PDC_REVISION_ID;
203 /* Enable coordination with firmware's _TSD info */
204 buf[2] = ACPI_PDC_SMP_T_SWCOORD;
206 /* Twiddle arch-specific bits needed for _PDC */
207 arch_acpi_set_pdc_bits(buf);
210 static struct acpi_object_list *acpi_processor_alloc_pdc(void)
212 struct acpi_object_list *obj_list;
213 union acpi_object *obj;
216 /* allocate and initialize pdc. It will be used later. */
217 obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
219 printk(KERN_ERR "Memory allocation error\n");
223 obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
225 printk(KERN_ERR "Memory allocation error\n");
230 buf = kmalloc(12, GFP_KERNEL);
232 printk(KERN_ERR "Memory allocation error\n");
238 acpi_set_pdc_bits(buf);
240 obj->type = ACPI_TYPE_BUFFER;
241 obj->buffer.length = 12;
242 obj->buffer.pointer = (u8 *) buf;
244 obj_list->pointer = obj;
250 * _PDC is required for a BIOS-OS handshake for most of the newer
251 * ACPI processor features.
254 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
256 acpi_status status = AE_OK;
260 * If mwait is disabled for CPU C-states, the C2C3_FFH access
261 * mode will be disabled in the parameter of _PDC object.
262 * Of course C1_FFH access mode will also be disabled.
264 union acpi_object *obj;
267 obj = pdc_in->pointer;
268 buffer = (u32 *)(obj->buffer.pointer);
269 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
272 status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
274 if (ACPI_FAILURE(status))
275 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
276 "Could not evaluate _PDC, using legacy perf. control.\n"));
281 static int early_pdc_done;
283 void acpi_processor_set_pdc(acpi_handle handle)
285 struct acpi_object_list *obj_list;
287 if (arch_has_acpi_pdc() == false)
293 obj_list = acpi_processor_alloc_pdc();
297 acpi_processor_eval_pdc(handle, obj_list);
299 kfree(obj_list->pointer->buffer.pointer);
300 kfree(obj_list->pointer);
303 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
305 static int early_pdc_optin;
306 static int set_early_pdc_optin(const struct dmi_system_id *id)
312 static int param_early_pdc_optin(char *s)
317 __setup("acpi_early_pdc_eval", param_early_pdc_optin);
319 static struct dmi_system_id __cpuinitdata early_pdc_optin_table[] = {
321 set_early_pdc_optin, "HP Envy", {
322 DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
323 DMI_MATCH(DMI_PRODUCT_NAME, "HP Envy") }, NULL},
325 set_early_pdc_optin, "HP Pavilion dv6", {
326 DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
327 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv6") }, NULL},
329 set_early_pdc_optin, "HP Pavilion dv7", {
330 DMI_MATCH(DMI_BIOS_VENDOR, "Hewlett-Packard"),
331 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dv7") }, NULL},
336 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
338 acpi_processor_set_pdc(handle);
342 void __init acpi_early_processor_set_pdc(void)
346 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
347 (struct acpi_table_header **)&madt)))
352 * Check whether the system is DMI table. If yes, OSPM
353 * should not use mwait for CPU-states.
355 dmi_check_system(processor_idle_dmi_table);
358 * Allow systems to opt-in to early _PDC evaluation.
360 dmi_check_system(early_pdc_optin_table);
361 if (!early_pdc_optin)
364 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
366 early_init_pdc, NULL, NULL, NULL);