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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
21ACPI_MODULE_NAME("processor_core");
22
23static 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
31static 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
41static 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
57static 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
74static 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
93static 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
134static 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
160exit:
161 if (buffer.pointer)
162 kfree(buffer.pointer);
163 return apic_id;
164}
165
166int 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}
215EXPORT_SYMBOL_GPL(acpi_get_cpuid);
216
217static 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
257static 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
269static 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 */
312static int __cpuinit
313acpi_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
340void __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
358static acpi_status __init
359early_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
368void __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}
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#include <linux/acpi.h>
14#include <acpi/processor.h>
15
16#include "internal.h"
17
18#define _COMPONENT ACPI_PROCESSOR_COMPONENT
19ACPI_MODULE_NAME("processor_core");
20
21static int map_lapic_id(struct acpi_subtable_header *entry,
22 u32 acpi_id, int *apic_id)
23{
24 struct acpi_madt_local_apic *lapic =
25 (struct acpi_madt_local_apic *)entry;
26
27 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
28 return -ENODEV;
29
30 if (lapic->processor_id != acpi_id)
31 return -EINVAL;
32
33 *apic_id = lapic->id;
34 return 0;
35}
36
37static int map_x2apic_id(struct acpi_subtable_header *entry,
38 int device_declaration, u32 acpi_id, int *apic_id)
39{
40 struct acpi_madt_local_x2apic *apic =
41 (struct acpi_madt_local_x2apic *)entry;
42
43 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
44 return -ENODEV;
45
46 if (device_declaration && (apic->uid == acpi_id)) {
47 *apic_id = apic->local_apic_id;
48 return 0;
49 }
50
51 return -EINVAL;
52}
53
54static int map_lsapic_id(struct acpi_subtable_header *entry,
55 int device_declaration, u32 acpi_id, int *apic_id)
56{
57 struct acpi_madt_local_sapic *lsapic =
58 (struct acpi_madt_local_sapic *)entry;
59
60 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
61 return -ENODEV;
62
63 if (device_declaration) {
64 if ((entry->length < 16) || (lsapic->uid != acpi_id))
65 return -EINVAL;
66 } else if (lsapic->processor_id != acpi_id)
67 return -EINVAL;
68
69 *apic_id = (lsapic->id << 8) | lsapic->eid;
70 return 0;
71}
72
73static int map_madt_entry(int type, u32 acpi_id)
74{
75 unsigned long madt_end, entry;
76 static struct acpi_table_madt *madt;
77 static int read_madt;
78 int apic_id = -1;
79
80 if (!read_madt) {
81 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
82 (struct acpi_table_header **)&madt)))
83 madt = NULL;
84 read_madt++;
85 }
86
87 if (!madt)
88 return apic_id;
89
90 entry = (unsigned long)madt;
91 madt_end = entry + madt->header.length;
92
93 /* Parse all entries looking for a match. */
94
95 entry += sizeof(struct acpi_table_madt);
96 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
97 struct acpi_subtable_header *header =
98 (struct acpi_subtable_header *)entry;
99 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
100 if (!map_lapic_id(header, acpi_id, &apic_id))
101 break;
102 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
103 if (!map_x2apic_id(header, type, acpi_id, &apic_id))
104 break;
105 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
106 if (!map_lsapic_id(header, type, acpi_id, &apic_id))
107 break;
108 }
109 entry += header->length;
110 }
111 return apic_id;
112}
113
114static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
115{
116 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
117 union acpi_object *obj;
118 struct acpi_subtable_header *header;
119 int apic_id = -1;
120
121 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
122 goto exit;
123
124 if (!buffer.length || !buffer.pointer)
125 goto exit;
126
127 obj = buffer.pointer;
128 if (obj->type != ACPI_TYPE_BUFFER ||
129 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
130 goto exit;
131 }
132
133 header = (struct acpi_subtable_header *)obj->buffer.pointer;
134 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
135 map_lapic_id(header, acpi_id, &apic_id);
136 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
137 map_lsapic_id(header, type, acpi_id, &apic_id);
138 }
139
140exit:
141 kfree(buffer.pointer);
142 return apic_id;
143}
144
145int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
146{
147 int apic_id;
148
149 apic_id = map_mat_entry(handle, type, acpi_id);
150 if (apic_id == -1)
151 apic_id = map_madt_entry(type, acpi_id);
152
153 return apic_id;
154}
155
156int acpi_map_cpuid(int apic_id, u32 acpi_id)
157{
158#ifdef CONFIG_SMP
159 int i;
160#endif
161
162 if (apic_id == -1) {
163 /*
164 * On UP processor, there is no _MAT or MADT table.
165 * So above apic_id is always set to -1.
166 *
167 * BIOS may define multiple CPU handles even for UP processor.
168 * For example,
169 *
170 * Scope (_PR)
171 * {
172 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
173 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
174 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
175 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
176 * }
177 *
178 * Ignores apic_id and always returns 0 for the processor
179 * handle with acpi id 0 if nr_cpu_ids is 1.
180 * This should be the case if SMP tables are not found.
181 * Return -1 for other CPU's handle.
182 */
183 if (nr_cpu_ids <= 1 && acpi_id == 0)
184 return acpi_id;
185 else
186 return apic_id;
187 }
188
189#ifdef CONFIG_SMP
190 for_each_possible_cpu(i) {
191 if (cpu_physical_id(i) == apic_id)
192 return i;
193 }
194#else
195 /* In UP kernel, only processor 0 is valid */
196 if (apic_id == 0)
197 return apic_id;
198#endif
199 return -1;
200}
201
202int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
203{
204 int apic_id;
205
206 apic_id = acpi_get_apicid(handle, type, acpi_id);
207
208 return acpi_map_cpuid(apic_id, acpi_id);
209}
210EXPORT_SYMBOL_GPL(acpi_get_cpuid);
211
212static bool __init processor_physically_present(acpi_handle handle)
213{
214 int cpuid, type;
215 u32 acpi_id;
216 acpi_status status;
217 acpi_object_type acpi_type;
218 unsigned long long tmp;
219 union acpi_object object = { 0 };
220 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
221
222 status = acpi_get_type(handle, &acpi_type);
223 if (ACPI_FAILURE(status))
224 return false;
225
226 switch (acpi_type) {
227 case ACPI_TYPE_PROCESSOR:
228 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
229 if (ACPI_FAILURE(status))
230 return false;
231 acpi_id = object.processor.proc_id;
232 break;
233 case ACPI_TYPE_DEVICE:
234 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
235 if (ACPI_FAILURE(status))
236 return false;
237 acpi_id = tmp;
238 break;
239 default:
240 return false;
241 }
242
243 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
244 cpuid = acpi_get_cpuid(handle, type, acpi_id);
245
246 if (cpuid == -1)
247 return false;
248
249 return true;
250}
251
252static void acpi_set_pdc_bits(u32 *buf)
253{
254 buf[0] = ACPI_PDC_REVISION_ID;
255 buf[1] = 1;
256
257 /* Enable coordination with firmware's _TSD info */
258 buf[2] = ACPI_PDC_SMP_T_SWCOORD;
259
260 /* Twiddle arch-specific bits needed for _PDC */
261 arch_acpi_set_pdc_bits(buf);
262}
263
264static struct acpi_object_list *acpi_processor_alloc_pdc(void)
265{
266 struct acpi_object_list *obj_list;
267 union acpi_object *obj;
268 u32 *buf;
269
270 /* allocate and initialize pdc. It will be used later. */
271 obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
272 if (!obj_list) {
273 printk(KERN_ERR "Memory allocation error\n");
274 return NULL;
275 }
276
277 obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
278 if (!obj) {
279 printk(KERN_ERR "Memory allocation error\n");
280 kfree(obj_list);
281 return NULL;
282 }
283
284 buf = kmalloc(12, GFP_KERNEL);
285 if (!buf) {
286 printk(KERN_ERR "Memory allocation error\n");
287 kfree(obj);
288 kfree(obj_list);
289 return NULL;
290 }
291
292 acpi_set_pdc_bits(buf);
293
294 obj->type = ACPI_TYPE_BUFFER;
295 obj->buffer.length = 12;
296 obj->buffer.pointer = (u8 *) buf;
297 obj_list->count = 1;
298 obj_list->pointer = obj;
299
300 return obj_list;
301}
302
303/*
304 * _PDC is required for a BIOS-OS handshake for most of the newer
305 * ACPI processor features.
306 */
307static acpi_status
308acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
309{
310 acpi_status status = AE_OK;
311
312 if (boot_option_idle_override == IDLE_NOMWAIT) {
313 /*
314 * If mwait is disabled for CPU C-states, the C2C3_FFH access
315 * mode will be disabled in the parameter of _PDC object.
316 * Of course C1_FFH access mode will also be disabled.
317 */
318 union acpi_object *obj;
319 u32 *buffer = NULL;
320
321 obj = pdc_in->pointer;
322 buffer = (u32 *)(obj->buffer.pointer);
323 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
324
325 }
326 status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
327
328 if (ACPI_FAILURE(status))
329 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
330 "Could not evaluate _PDC, using legacy perf. control.\n"));
331
332 return status;
333}
334
335void acpi_processor_set_pdc(acpi_handle handle)
336{
337 struct acpi_object_list *obj_list;
338
339 if (arch_has_acpi_pdc() == false)
340 return;
341
342 obj_list = acpi_processor_alloc_pdc();
343 if (!obj_list)
344 return;
345
346 acpi_processor_eval_pdc(handle, obj_list);
347
348 kfree(obj_list->pointer->buffer.pointer);
349 kfree(obj_list->pointer);
350 kfree(obj_list);
351}
352
353static acpi_status __init
354early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
355{
356 if (processor_physically_present(handle) == false)
357 return AE_OK;
358
359 acpi_processor_set_pdc(handle);
360 return AE_OK;
361}
362
363#if defined(CONFIG_X86) || defined(CONFIG_IA64)
364static int __init set_no_mwait(const struct dmi_system_id *id)
365{
366 pr_notice(PREFIX "%s detected - disabling mwait for CPU C-states\n",
367 id->ident);
368 boot_option_idle_override = IDLE_NOMWAIT;
369 return 0;
370}
371
372static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
373 {
374 set_no_mwait, "Extensa 5220", {
375 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
376 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
377 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
378 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
379 {},
380};
381
382static void __init processor_dmi_check(void)
383{
384 /*
385 * Check whether the system is DMI table. If yes, OSPM
386 * should not use mwait for CPU-states.
387 */
388 dmi_check_system(processor_idle_dmi_table);
389}
390#else
391static inline void processor_dmi_check(void) {}
392#endif
393
394void __init acpi_early_processor_set_pdc(void)
395{
396 processor_dmi_check();
397
398 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
399 ACPI_UINT32_MAX,
400 early_init_pdc, NULL, NULL, NULL);
401 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
402}