Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[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 #include <linux/slab.h>
12
13 #include <acpi/acpi_drivers.h>
14 #include <acpi/processor.h>
15
16 #include "internal.h"
17
18 #define PREFIX                  "ACPI: "
19 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
20 ACPI_MODULE_NAME("processor_core");
21
22 static int __init set_no_mwait(const struct dmi_system_id *id)
23 {
24         printk(KERN_NOTICE PREFIX "%s detected - "
25                 "disabling mwait for CPU C-states\n", id->ident);
26         boot_option_idle_override = IDLE_NOMWAIT;
27         return 0;
28 }
29
30 static struct dmi_system_id __initdata processor_idle_dmi_table[] = {
31         {
32         set_no_mwait, "Extensa 5220", {
33         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
34         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
35         DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
36         DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
37         {},
38 };
39
40 static int map_lapic_id(struct acpi_subtable_header *entry,
41                  u32 acpi_id, int *apic_id)
42 {
43         struct acpi_madt_local_apic *lapic =
44                 (struct acpi_madt_local_apic *)entry;
45
46         if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
47                 return 0;
48
49         if (lapic->processor_id != acpi_id)
50                 return 0;
51
52         *apic_id = lapic->id;
53         return 1;
54 }
55
56 static int map_x2apic_id(struct acpi_subtable_header *entry,
57                          int device_declaration, u32 acpi_id, int *apic_id)
58 {
59         struct acpi_madt_local_x2apic *apic =
60                 (struct acpi_madt_local_x2apic *)entry;
61
62         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
63                 return 0;
64
65         if (device_declaration && (apic->uid == acpi_id)) {
66                 *apic_id = apic->local_apic_id;
67                 return 1;
68         }
69
70         return 0;
71 }
72
73 static int map_lsapic_id(struct acpi_subtable_header *entry,
74                 int device_declaration, u32 acpi_id, int *apic_id)
75 {
76         struct acpi_madt_local_sapic *lsapic =
77                 (struct acpi_madt_local_sapic *)entry;
78
79         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
80                 return 0;
81
82         if (device_declaration) {
83                 if ((entry->length < 16) || (lsapic->uid != acpi_id))
84                         return 0;
85         } else if (lsapic->processor_id != acpi_id)
86                 return 0;
87
88         *apic_id = (lsapic->id << 8) | lsapic->eid;
89         return 1;
90 }
91
92 static int map_madt_entry(int type, u32 acpi_id)
93 {
94         unsigned long madt_end, entry;
95         static struct acpi_table_madt *madt;
96         static int read_madt;
97         int apic_id = -1;
98
99         if (!read_madt) {
100                 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
101                                         (struct acpi_table_header **)&madt)))
102                         madt = NULL;
103                 read_madt++;
104         }
105
106         if (!madt)
107                 return apic_id;
108
109         entry = (unsigned long)madt;
110         madt_end = entry + madt->header.length;
111
112         /* Parse all entries looking for a match. */
113
114         entry += sizeof(struct acpi_table_madt);
115         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
116                 struct acpi_subtable_header *header =
117                         (struct acpi_subtable_header *)entry;
118                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
119                         if (map_lapic_id(header, acpi_id, &apic_id))
120                                 break;
121                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
122                         if (map_x2apic_id(header, type, acpi_id, &apic_id))
123                                 break;
124                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
125                         if (map_lsapic_id(header, type, acpi_id, &apic_id))
126                                 break;
127                 }
128                 entry += header->length;
129         }
130         return apic_id;
131 }
132
133 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
134 {
135         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
136         union acpi_object *obj;
137         struct acpi_subtable_header *header;
138         int apic_id = -1;
139
140         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
141                 goto exit;
142
143         if (!buffer.length || !buffer.pointer)
144                 goto exit;
145
146         obj = buffer.pointer;
147         if (obj->type != ACPI_TYPE_BUFFER ||
148             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
149                 goto exit;
150         }
151
152         header = (struct acpi_subtable_header *)obj->buffer.pointer;
153         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
154                 map_lapic_id(header, acpi_id, &apic_id);
155         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
156                 map_lsapic_id(header, type, acpi_id, &apic_id);
157         }
158
159 exit:
160         if (buffer.pointer)
161                 kfree(buffer.pointer);
162         return apic_id;
163 }
164
165 int 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)
176                 return apic_id;
177
178 #ifdef CONFIG_SMP
179         for_each_possible_cpu(i) {
180                 if (cpu_physical_id(i) == apic_id)
181                         return i;
182         }
183 #else
184         /* In UP kernel, only processor 0 is valid */
185         if (apic_id == 0)
186                 return apic_id;
187 #endif
188         return -1;
189 }
190 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
191
192 static bool __init processor_physically_present(acpi_handle handle)
193 {
194         int cpuid, type;
195         u32 acpi_id;
196         acpi_status status;
197         acpi_object_type acpi_type;
198         unsigned long long tmp;
199         union acpi_object object = { 0 };
200         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
201
202         status = acpi_get_type(handle, &acpi_type);
203         if (ACPI_FAILURE(status))
204                 return false;
205
206         switch (acpi_type) {
207         case ACPI_TYPE_PROCESSOR:
208                 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
209                 if (ACPI_FAILURE(status))
210                         return false;
211                 acpi_id = object.processor.proc_id;
212                 break;
213         case ACPI_TYPE_DEVICE:
214                 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
215                 if (ACPI_FAILURE(status))
216                         return false;
217                 acpi_id = tmp;
218                 break;
219         default:
220                 return false;
221         }
222
223         type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
224         cpuid = acpi_get_cpuid(handle, type, acpi_id);
225
226         if (cpuid == -1)
227                 return false;
228
229         return true;
230 }
231
232 static void __cpuinit acpi_set_pdc_bits(u32 *buf)
233 {
234         buf[0] = ACPI_PDC_REVISION_ID;
235         buf[1] = 1;
236
237         /* Enable coordination with firmware's _TSD info */
238         buf[2] = ACPI_PDC_SMP_T_SWCOORD;
239
240         /* Twiddle arch-specific bits needed for _PDC */
241         arch_acpi_set_pdc_bits(buf);
242 }
243
244 static struct acpi_object_list *__cpuinit acpi_processor_alloc_pdc(void)
245 {
246         struct acpi_object_list *obj_list;
247         union acpi_object *obj;
248         u32 *buf;
249
250         /* allocate and initialize pdc. It will be used later. */
251         obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
252         if (!obj_list) {
253                 printk(KERN_ERR "Memory allocation error\n");
254                 return NULL;
255         }
256
257         obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
258         if (!obj) {
259                 printk(KERN_ERR "Memory allocation error\n");
260                 kfree(obj_list);
261                 return NULL;
262         }
263
264         buf = kmalloc(12, GFP_KERNEL);
265         if (!buf) {
266                 printk(KERN_ERR "Memory allocation error\n");
267                 kfree(obj);
268                 kfree(obj_list);
269                 return NULL;
270         }
271
272         acpi_set_pdc_bits(buf);
273
274         obj->type = ACPI_TYPE_BUFFER;
275         obj->buffer.length = 12;
276         obj->buffer.pointer = (u8 *) buf;
277         obj_list->count = 1;
278         obj_list->pointer = obj;
279
280         return obj_list;
281 }
282
283 /*
284  * _PDC is required for a BIOS-OS handshake for most of the newer
285  * ACPI processor features.
286  */
287 static int __cpuinit
288 acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
289 {
290         acpi_status status = AE_OK;
291
292         if (boot_option_idle_override == IDLE_NOMWAIT) {
293                 /*
294                  * If mwait is disabled for CPU C-states, the C2C3_FFH access
295                  * mode will be disabled in the parameter of _PDC object.
296                  * Of course C1_FFH access mode will also be disabled.
297                  */
298                 union acpi_object *obj;
299                 u32 *buffer = NULL;
300
301                 obj = pdc_in->pointer;
302                 buffer = (u32 *)(obj->buffer.pointer);
303                 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
304
305         }
306         status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
307
308         if (ACPI_FAILURE(status))
309                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
310                     "Could not evaluate _PDC, using legacy perf. control.\n"));
311
312         return status;
313 }
314
315 void __cpuinit acpi_processor_set_pdc(acpi_handle handle)
316 {
317         struct acpi_object_list *obj_list;
318
319         if (arch_has_acpi_pdc() == false)
320                 return;
321
322         obj_list = acpi_processor_alloc_pdc();
323         if (!obj_list)
324                 return;
325
326         acpi_processor_eval_pdc(handle, obj_list);
327
328         kfree(obj_list->pointer->buffer.pointer);
329         kfree(obj_list->pointer);
330         kfree(obj_list);
331 }
332
333 static acpi_status __init
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         acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
355 }