Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[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 int map_lapic_id(struct acpi_subtable_header *entry,
47                  u32 acpi_id, int *apic_id)
48 {
49         struct acpi_madt_local_apic *lapic =
50                 (struct acpi_madt_local_apic *)entry;
51
52         if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
53                 return 0;
54
55         if (lapic->processor_id != acpi_id)
56                 return 0;
57
58         *apic_id = lapic->id;
59         return 1;
60 }
61
62 static int map_x2apic_id(struct acpi_subtable_header *entry,
63                          int device_declaration, u32 acpi_id, int *apic_id)
64 {
65         struct acpi_madt_local_x2apic *apic =
66                 (struct acpi_madt_local_x2apic *)entry;
67
68         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
69                 return 0;
70
71         if (device_declaration && (apic->uid == acpi_id)) {
72                 *apic_id = apic->local_apic_id;
73                 return 1;
74         }
75
76         return 0;
77 }
78
79 static int map_lsapic_id(struct acpi_subtable_header *entry,
80                 int device_declaration, u32 acpi_id, int *apic_id)
81 {
82         struct acpi_madt_local_sapic *lsapic =
83                 (struct acpi_madt_local_sapic *)entry;
84
85         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
86                 return 0;
87
88         if (device_declaration) {
89                 if ((entry->length < 16) || (lsapic->uid != acpi_id))
90                         return 0;
91         } else if (lsapic->processor_id != acpi_id)
92                 return 0;
93
94         *apic_id = (lsapic->id << 8) | lsapic->eid;
95         return 1;
96 }
97
98 static int map_madt_entry(int type, u32 acpi_id)
99 {
100         unsigned long madt_end, entry;
101         static struct acpi_table_madt *madt;
102         static int read_madt;
103         int apic_id = -1;
104
105         if (!read_madt) {
106                 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
107                                         (struct acpi_table_header **)&madt)))
108                         madt = NULL;
109                 read_madt++;
110         }
111
112         if (!madt)
113                 return apic_id;
114
115         entry = (unsigned long)madt;
116         madt_end = entry + madt->header.length;
117
118         /* Parse all entries looking for a match. */
119
120         entry += sizeof(struct acpi_table_madt);
121         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
122                 struct acpi_subtable_header *header =
123                         (struct acpi_subtable_header *)entry;
124                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
125                         if (map_lapic_id(header, acpi_id, &apic_id))
126                                 break;
127                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
128                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
129                                 break;
130                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
131                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
132                                 break;
133                 }
134                 entry += header->length;
135         }
136         return apic_id;
137 }
138
139 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
140 {
141         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
142         union acpi_object *obj;
143         struct acpi_subtable_header *header;
144         int apic_id = -1;
145
146         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
147                 goto exit;
148
149         if (!buffer.length || !buffer.pointer)
150                 goto exit;
151
152         obj = buffer.pointer;
153         if (obj->type != ACPI_TYPE_BUFFER ||
154             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
155                 goto exit;
156         }
157
158         header = (struct acpi_subtable_header *)obj->buffer.pointer;
159         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
160                 map_lapic_id(header, acpi_id, &apic_id);
161         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
162                 map_lsapic_id(header, type, acpi_id, &apic_id);
163         }
164
165 exit:
166         if (buffer.pointer)
167                 kfree(buffer.pointer);
168         return apic_id;
169 }
170
171 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
172 {
173         int i;
174         int apic_id = -1;
175
176         apic_id = map_mat_entry(handle, type, acpi_id);
177         if (apic_id == -1)
178                 apic_id = map_madt_entry(type, acpi_id);
179         if (apic_id == -1)
180                 return apic_id;
181
182         for_each_possible_cpu(i) {
183                 if (cpu_physical_id(i) == apic_id)
184                         return i;
185         }
186         return -1;
187 }
188 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
189 #endif
190
191 static bool processor_physically_present(acpi_handle handle)
192 {
193         int cpuid, type;
194         u32 acpi_id;
195         acpi_status status;
196         acpi_object_type acpi_type;
197         unsigned long long tmp;
198         union acpi_object object = { 0 };
199         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
200
201         status = acpi_get_type(handle, &acpi_type);
202         if (ACPI_FAILURE(status))
203                 return false;
204
205         switch (acpi_type) {
206         case ACPI_TYPE_PROCESSOR:
207                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
208                 if (ACPI_FAILURE(status))
209                         return false;
210                 acpi_id = object.processor.proc_id;
211                 break;
212         case ACPI_TYPE_DEVICE:
213                 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
214                 if (ACPI_FAILURE(status))
215                         return false;
216                 acpi_id = tmp;
217                 break;
218         default:
219                 return false;
220         }
221
222         type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
223         cpuid = acpi_get_cpuid(handle, type, acpi_id);
224
225         if (cpuid == -1)
226                 return false;
227
228         return true;
229 }
230
231 static void acpi_set_pdc_bits(u32 *buf)
232 {
233         buf[0] = ACPI_PDC_REVISION_ID;
234         buf[1] = 1;
235
236         /* Enable coordination with firmware's _TSD info */
237         buf[2] = ACPI_PDC_SMP_T_SWCOORD;
238
239         /* Twiddle arch-specific bits needed for _PDC */
240         arch_acpi_set_pdc_bits(buf);
241 }
242
243 static struct acpi_object_list *acpi_processor_alloc_pdc(void)
244 {
245         struct acpi_object_list *obj_list;
246         union acpi_object *obj;
247         u32 *buf;
248
249         /* allocate and initialize pdc. It will be used later. */
250         obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
251         if (!obj_list) {
252                 printk(KERN_ERR "Memory allocation error\n");
253                 return NULL;
254         }
255
256         obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
257         if (!obj) {
258                 printk(KERN_ERR "Memory allocation error\n");
259                 kfree(obj_list);
260                 return NULL;
261         }
262
263         buf = kmalloc(12, GFP_KERNEL);
264         if (!buf) {
265                 printk(KERN_ERR "Memory allocation error\n");
266                 kfree(obj);
267                 kfree(obj_list);
268                 return NULL;
269         }
270
271         acpi_set_pdc_bits(buf);
272
273         obj->type = ACPI_TYPE_BUFFER;
274         obj->buffer.length = 12;
275         obj->buffer.pointer = (u8 *) buf;
276         obj_list->count = 1;
277         obj_list->pointer = obj;
278
279         return obj_list;
280 }
281
282 /*
283  * _PDC is required for a BIOS-OS handshake for most of the newer
284  * ACPI processor features.
285  */
286 static int
287 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
288 {
289         acpi_status status = AE_OK;
290
291         if (idle_nomwait) {
292                 /*
293                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
294                  * mode will be disabled in the parameter of _PDC object.
295                  * Of course C1_FFH access mode will also be disabled.
296                  */
297                 union acpi_object *obj;
298                 u32 *buffer = NULL;
299
300                 obj = pdc_in->pointer;
301                 buffer = (u32 *)(obj->buffer.pointer);
302                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
303
304         }
305         status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
306
307         if (ACPI_FAILURE(status))
308                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
309                     "Could not evaluate _PDC, using legacy perf. control.\n"));
310
311         return status;
312 }
313
314 void acpi_processor_set_pdc(acpi_handle handle)
315 {
316         struct acpi_object_list *obj_list;
317
318         if (arch_has_acpi_pdc() == false)
319                 return;
320
321         obj_list = acpi_processor_alloc_pdc();
322         if (!obj_list)
323                 return;
324
325         acpi_processor_eval_pdc(handle, obj_list);
326
327         kfree(obj_list->pointer->buffer.pointer);
328         kfree(obj_list->pointer);
329         kfree(obj_list);
330 }
331 EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
332
333 static acpi_status
334 early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
335 {
336         if (processor_physically_present(handle) == false)
337                 return AE_OK;
338
339         acpi_processor_set_pdc(handle);
340         return AE_OK;
341 }
342
343 void __init acpi_early_processor_set_pdc(void)
344 {
345         /*
346          * Check whether the system is DMI table. If yes, OSPM
347          * should not use mwait for CPU-states.
348          */
349         dmi_check_system(processor_idle_dmi_table);
350
351         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
352                             ACPI_UINT32_MAX,
353                             early_init_pdc, NULL, NULL, NULL);
354 }