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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
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 kfree(buffer.pointer);
162 return apic_id;
163}
164
165int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
166{
167#ifdef CONFIG_SMP
168 int i;
169#endif
170 int apic_id = -1;
171
172 apic_id = map_mat_entry(handle, type, acpi_id);
173 if (apic_id == -1)
174 apic_id = map_madt_entry(type, acpi_id);
175 if (apic_id == -1) {
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195
196 if (nr_cpu_ids <= 1 && acpi_id == 0)
197 return acpi_id;
198 else
199 return apic_id;
200 }
201
202#ifdef CONFIG_SMP
203 for_each_possible_cpu(i) {
204 if (cpu_physical_id(i) == apic_id)
205 return i;
206 }
207#else
208
209 if (apic_id == 0)
210 return apic_id;
211#endif
212 return -1;
213}
214EXPORT_SYMBOL_GPL(acpi_get_cpuid);
215
216static bool __init processor_physically_present(acpi_handle handle)
217{
218 int cpuid, type;
219 u32 acpi_id;
220 acpi_status status;
221 acpi_object_type acpi_type;
222 unsigned long long tmp;
223 union acpi_object object = { 0 };
224 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
225
226 status = acpi_get_type(handle, &acpi_type);
227 if (ACPI_FAILURE(status))
228 return false;
229
230 switch (acpi_type) {
231 case ACPI_TYPE_PROCESSOR:
232 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
233 if (ACPI_FAILURE(status))
234 return false;
235 acpi_id = object.processor.proc_id;
236 break;
237 case ACPI_TYPE_DEVICE:
238 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
239 if (ACPI_FAILURE(status))
240 return false;
241 acpi_id = tmp;
242 break;
243 default:
244 return false;
245 }
246
247 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
248 cpuid = acpi_get_cpuid(handle, type, acpi_id);
249
250 if (cpuid == -1)
251 return false;
252
253 return true;
254}
255
256static void __cpuinit acpi_set_pdc_bits(u32 *buf)
257{
258 buf[0] = ACPI_PDC_REVISION_ID;
259 buf[1] = 1;
260
261
262 buf[2] = ACPI_PDC_SMP_T_SWCOORD;
263
264
265 arch_acpi_set_pdc_bits(buf);
266}
267
268static struct acpi_object_list *__cpuinit acpi_processor_alloc_pdc(void)
269{
270 struct acpi_object_list *obj_list;
271 union acpi_object *obj;
272 u32 *buf;
273
274
275 obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
276 if (!obj_list) {
277 printk(KERN_ERR "Memory allocation error\n");
278 return NULL;
279 }
280
281 obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
282 if (!obj) {
283 printk(KERN_ERR "Memory allocation error\n");
284 kfree(obj_list);
285 return NULL;
286 }
287
288 buf = kmalloc(12, GFP_KERNEL);
289 if (!buf) {
290 printk(KERN_ERR "Memory allocation error\n");
291 kfree(obj);
292 kfree(obj_list);
293 return NULL;
294 }
295
296 acpi_set_pdc_bits(buf);
297
298 obj->type = ACPI_TYPE_BUFFER;
299 obj->buffer.length = 12;
300 obj->buffer.pointer = (u8 *) buf;
301 obj_list->count = 1;
302 obj_list->pointer = obj;
303
304 return obj_list;
305}
306
307
308
309
310
311static int __cpuinit
312acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
313{
314 acpi_status status = AE_OK;
315
316 if (boot_option_idle_override == IDLE_NOMWAIT) {
317
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319
320
321
322 union acpi_object *obj;
323 u32 *buffer = NULL;
324
325 obj = pdc_in->pointer;
326 buffer = (u32 *)(obj->buffer.pointer);
327 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
328
329 }
330 status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
331
332 if (ACPI_FAILURE(status))
333 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
334 "Could not evaluate _PDC, using legacy perf. control.\n"));
335
336 return status;
337}
338
339void __cpuinit acpi_processor_set_pdc(acpi_handle handle)
340{
341 struct acpi_object_list *obj_list;
342
343 if (arch_has_acpi_pdc() == false)
344 return;
345
346 obj_list = acpi_processor_alloc_pdc();
347 if (!obj_list)
348 return;
349
350 acpi_processor_eval_pdc(handle, obj_list);
351
352 kfree(obj_list->pointer->buffer.pointer);
353 kfree(obj_list->pointer);
354 kfree(obj_list);
355}
356
357static acpi_status __init
358early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
359{
360 if (processor_physically_present(handle) == false)
361 return AE_OK;
362
363 acpi_processor_set_pdc(handle);
364 return AE_OK;
365}
366
367void __init acpi_early_processor_set_pdc(void)
368{
369
370
371
372
373 dmi_check_system(processor_idle_dmi_table);
374
375 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
376 ACPI_UINT32_MAX,
377 early_init_pdc, NULL, NULL, NULL);
378 acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
379}
380