ACPI: processor: driver doesn't need to evaluate _PDC
[linux-2.6.git] / drivers / acpi / processor_core.c
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/dmi.h>
11
12 #include <acpi/acpi_drivers.h>
13 #include <acpi/processor.h>
14
15 #include "internal.h"
16
17 #define PREFIX                  "ACPI: "
18 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
19 ACPI_MODULE_NAME("processor_core");
20
21 static int set_no_mwait(const struct dmi_system_id *id)
22 {
23         printk(KERN_NOTICE PREFIX "%s detected - "
24                 "disabling mwait for CPU C-states\n", id->ident);
25         idle_nomwait = 1;
26         return 0;
27 }
28
29 static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
30         {
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},
36         {
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},
42         {},
43 };
44
45 #ifdef CONFIG_SMP
46 static struct acpi_table_madt *madt;
47
48 static int map_lapic_id(struct acpi_subtable_header *entry,
49                  u32 acpi_id, int *apic_id)
50 {
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) {
55                 *apic_id = lapic->id;
56                 return 1;
57         }
58         return 0;
59 }
60
61 static int map_x2apic_id(struct acpi_subtable_header *entry,
62                          int device_declaration, u32 acpi_id, int *apic_id)
63 {
64         struct acpi_madt_local_x2apic *apic =
65                 (struct acpi_madt_local_x2apic *)entry;
66         u32 tmp = apic->local_apic_id;
67
68         /* Only check enabled APICs*/
69         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
70                 return 0;
71
72         /* Device statement declaration type */
73         if (device_declaration) {
74                 if (apic->uid == acpi_id)
75                         goto found;
76         }
77
78         return 0;
79 found:
80         *apic_id = tmp;
81         return 1;
82 }
83
84 static int map_lsapic_id(struct acpi_subtable_header *entry,
85                 int device_declaration, u32 acpi_id, int *apic_id)
86 {
87         struct acpi_madt_local_sapic *lsapic =
88                 (struct acpi_madt_local_sapic *)entry;
89         u32 tmp = (lsapic->id << 8) | lsapic->eid;
90
91         /* Only check enabled APICs*/
92         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
93                 return 0;
94
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",
100                             tmp);
101                 else if (lsapic->uid == acpi_id)
102                         goto found;
103         /* Processor statement declaration type */
104         } else if (lsapic->processor_id == acpi_id)
105                 goto found;
106
107         return 0;
108 found:
109         *apic_id = tmp;
110         return 1;
111 }
112
113 static int map_madt_entry(int type, u32 acpi_id)
114 {
115         unsigned long madt_end, entry;
116         int apic_id = -1;
117
118         if (!madt)
119                 return apic_id;
120
121         entry = (unsigned long)madt;
122         madt_end = entry + madt->header.length;
123
124         /* Parse all entries looking for a match. */
125
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))
132                                 break;
133                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
134                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
135                                 break;
136                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
137                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
138                                 break;
139                 }
140                 entry += header->length;
141         }
142         return apic_id;
143 }
144
145 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
146 {
147         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
148         union acpi_object *obj;
149         struct acpi_subtable_header *header;
150         int apic_id = -1;
151
152         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
153                 goto exit;
154
155         if (!buffer.length || !buffer.pointer)
156                 goto exit;
157
158         obj = buffer.pointer;
159         if (obj->type != ACPI_TYPE_BUFFER ||
160             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
161                 goto exit;
162         }
163
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);
169         }
170
171 exit:
172         if (buffer.pointer)
173                 kfree(buffer.pointer);
174         return apic_id;
175 }
176
177 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
178 {
179         int i;
180         int apic_id = -1;
181
182         apic_id = map_mat_entry(handle, type, acpi_id);
183         if (apic_id == -1)
184                 apic_id = map_madt_entry(type, acpi_id);
185         if (apic_id == -1)
186                 return apic_id;
187
188         for_each_possible_cpu(i) {
189                 if (cpu_physical_id(i) == apic_id)
190                         return i;
191         }
192         return -1;
193 }
194 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
195 #endif
196
197 static bool processor_physically_present(acpi_handle handle)
198 {
199         int cpuid, type;
200         u32 acpi_id;
201         acpi_status status;
202         acpi_object_type acpi_type;
203         unsigned long long tmp;
204         union acpi_object object = { 0 };
205         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
206
207         status = acpi_get_type(handle, &acpi_type);
208         if (ACPI_FAILURE(status))
209                 return false;
210
211         switch (acpi_type) {
212         case ACPI_TYPE_PROCESSOR:
213                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
214                 if (ACPI_FAILURE(status))
215                         return false;
216                 acpi_id = object.processor.proc_id;
217                 break;
218         case ACPI_TYPE_DEVICE:
219                 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
220                 if (ACPI_FAILURE(status))
221                         return false;
222                 acpi_id = tmp;
223                 break;
224         default:
225                 return false;
226         }
227
228         type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
229         cpuid = acpi_get_cpuid(handle, type, acpi_id);
230
231         if (cpuid == -1)
232                 return false;
233
234         return true;
235 }
236
237 static void acpi_set_pdc_bits(u32 *buf)
238 {
239         buf[0] = ACPI_PDC_REVISION_ID;
240         buf[1] = 1;
241
242         /* Enable coordination with firmware's _TSD info */
243         buf[2] = ACPI_PDC_SMP_T_SWCOORD;
244
245         /* Twiddle arch-specific bits needed for _PDC */
246         arch_acpi_set_pdc_bits(buf);
247 }
248
249 static struct acpi_object_list *acpi_processor_alloc_pdc(void)
250 {
251         struct acpi_object_list *obj_list;
252         union acpi_object *obj;
253         u32 *buf;
254
255         /* allocate and initialize pdc. It will be used later. */
256         obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
257         if (!obj_list) {
258                 printk(KERN_ERR "Memory allocation error\n");
259                 return NULL;
260         }
261
262         obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
263         if (!obj) {
264                 printk(KERN_ERR "Memory allocation error\n");
265                 kfree(obj_list);
266                 return NULL;
267         }
268
269         buf = kmalloc(12, GFP_KERNEL);
270         if (!buf) {
271                 printk(KERN_ERR "Memory allocation error\n");
272                 kfree(obj);
273                 kfree(obj_list);
274                 return NULL;
275         }
276
277         acpi_set_pdc_bits(buf);
278
279         obj->type = ACPI_TYPE_BUFFER;
280         obj->buffer.length = 12;
281         obj->buffer.pointer = (u8 *) buf;
282         obj_list->count = 1;
283         obj_list->pointer = obj;
284
285         return obj_list;
286 }
287
288 /*
289  * _PDC is required for a BIOS-OS handshake for most of the newer
290  * ACPI processor features.
291  */
292 static int
293 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
294 {
295         acpi_status status = AE_OK;
296
297         if (idle_nomwait) {
298                 /*
299                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
300                  * mode will be disabled in the parameter of _PDC object.
301                  * Of course C1_FFH access mode will also be disabled.
302                  */
303                 union acpi_object *obj;
304                 u32 *buffer = NULL;
305
306                 obj = pdc_in->pointer;
307                 buffer = (u32 *)(obj->buffer.pointer);
308                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
309
310         }
311         status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
312
313         if (ACPI_FAILURE(status))
314                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315                     "Could not evaluate _PDC, using legacy perf. control.\n"));
316
317         return status;
318 }
319
320 void acpi_processor_set_pdc(acpi_handle handle)
321 {
322         struct acpi_object_list *obj_list;
323
324         if (arch_has_acpi_pdc() == false)
325                 return;
326
327         obj_list = acpi_processor_alloc_pdc();
328         if (!obj_list)
329                 return;
330
331         acpi_processor_eval_pdc(handle, obj_list);
332
333         kfree(obj_list->pointer->buffer.pointer);
334         kfree(obj_list->pointer);
335         kfree(obj_list);
336 }
337 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
338
339 static acpi_status
340 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
341 {
342         if (processor_physically_present(handle) == false)
343                 return AE_OK;
344
345         acpi_processor_set_pdc(handle);
346         return AE_OK;
347 }
348
349 void __init acpi_early_processor_set_pdc(void)
350 {
351
352 #ifdef CONFIG_SMP
353         if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
354                                 (struct acpi_table_header **)&madt)))
355                 madt = NULL;
356 #endif
357
358         /*
359          * Check whether the system is DMI table. If yes, OSPM
360          * should not use mwait for CPU-states.
361          */
362         dmi_check_system(processor_idle_dmi_table);
363
364         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
365                             ACPI_UINT32_MAX,
366                             early_init_pdc, NULL, NULL, NULL);
367 }