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Commit | Line | Data |
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47817254 AC |
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 | */ | |
78f16996 | 10 | #include <linux/dmi.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
78f16996 AC |
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 | |
4d5d4cd8 | 20 | ACPI_MODULE_NAME("processor_core"); |
78f16996 AC |
21 | |
22 | static int 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 | idle_nomwait = 1; | |
27 | return 0; | |
28 | } | |
29 | ||
30 | static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = { | |
31 | { | |
32 | set_no_mwait, "IFL91 board", { | |
33 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
34 | DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"), | |
35 | DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"), | |
36 | DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL}, | |
37 | { | |
38 | set_no_mwait, "Extensa 5220", { | |
39 | DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), | |
40 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
41 | DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), | |
42 | DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, | |
43 | {}, | |
44 | }; | |
45 | ||
78ed8bd2 | 46 | #ifdef CONFIG_SMP |
78ed8bd2 AC |
47 | static int map_lapic_id(struct acpi_subtable_header *entry, |
48 | u32 acpi_id, int *apic_id) | |
49 | { | |
50 | struct acpi_madt_local_apic *lapic = | |
51 | (struct acpi_madt_local_apic *)entry; | |
11130736 AC |
52 | |
53 | if (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) | |
54 | return 0; | |
55 | ||
56 | if (lapic->processor_id != acpi_id) | |
57 | return 0; | |
58 | ||
59 | *apic_id = lapic->id; | |
60 | return 1; | |
78ed8bd2 AC |
61 | } |
62 | ||
63 | static int map_x2apic_id(struct acpi_subtable_header *entry, | |
64 | int device_declaration, u32 acpi_id, int *apic_id) | |
65 | { | |
66 | struct acpi_madt_local_x2apic *apic = | |
67 | (struct acpi_madt_local_x2apic *)entry; | |
78ed8bd2 | 68 | |
78ed8bd2 AC |
69 | if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) |
70 | return 0; | |
71 | ||
d6742095 AC |
72 | if (device_declaration && (apic->uid == acpi_id)) { |
73 | *apic_id = apic->local_apic_id; | |
74 | return 1; | |
78ed8bd2 AC |
75 | } |
76 | ||
77 | return 0; | |
78ed8bd2 AC |
78 | } |
79 | ||
80 | static int map_lsapic_id(struct acpi_subtable_header *entry, | |
81 | int device_declaration, u32 acpi_id, int *apic_id) | |
82 | { | |
83 | struct acpi_madt_local_sapic *lsapic = | |
84 | (struct acpi_madt_local_sapic *)entry; | |
78ed8bd2 | 85 | |
78ed8bd2 AC |
86 | if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) |
87 | return 0; | |
88 | ||
78ed8bd2 | 89 | if (device_declaration) { |
eae701ce AC |
90 | if ((entry->length < 16) || (lsapic->uid != acpi_id)) |
91 | return 0; | |
92 | } else if (lsapic->processor_id != acpi_id) | |
93 | return 0; | |
78ed8bd2 | 94 | |
eae701ce | 95 | *apic_id = (lsapic->id << 8) | lsapic->eid; |
78ed8bd2 AC |
96 | return 1; |
97 | } | |
98 | ||
99 | static int map_madt_entry(int type, u32 acpi_id) | |
100 | { | |
101 | unsigned long madt_end, entry; | |
149fe9c2 AC |
102 | static struct acpi_table_madt *madt; |
103 | static int read_madt; | |
78ed8bd2 AC |
104 | int apic_id = -1; |
105 | ||
149fe9c2 AC |
106 | if (!read_madt) { |
107 | if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, | |
108 | (struct acpi_table_header **)&madt))) | |
109 | madt = NULL; | |
110 | read_madt++; | |
111 | } | |
112 | ||
78ed8bd2 AC |
113 | if (!madt) |
114 | return apic_id; | |
115 | ||
116 | entry = (unsigned long)madt; | |
117 | madt_end = entry + madt->header.length; | |
118 | ||
119 | /* Parse all entries looking for a match. */ | |
120 | ||
121 | entry += sizeof(struct acpi_table_madt); | |
122 | while (entry + sizeof(struct acpi_subtable_header) < madt_end) { | |
123 | struct acpi_subtable_header *header = | |
124 | (struct acpi_subtable_header *)entry; | |
125 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { | |
126 | if (map_lapic_id(header, acpi_id, &apic_id)) | |
127 | break; | |
128 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { | |
129 | if (map_x2apic_id(header, type, acpi_id, &apic_id)) | |
130 | break; | |
131 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { | |
132 | if (map_lsapic_id(header, type, acpi_id, &apic_id)) | |
133 | break; | |
134 | } | |
135 | entry += header->length; | |
136 | } | |
137 | return apic_id; | |
138 | } | |
139 | ||
140 | static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) | |
141 | { | |
142 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
143 | union acpi_object *obj; | |
144 | struct acpi_subtable_header *header; | |
145 | int apic_id = -1; | |
146 | ||
147 | if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) | |
148 | goto exit; | |
149 | ||
150 | if (!buffer.length || !buffer.pointer) | |
151 | goto exit; | |
152 | ||
153 | obj = buffer.pointer; | |
154 | if (obj->type != ACPI_TYPE_BUFFER || | |
155 | obj->buffer.length < sizeof(struct acpi_subtable_header)) { | |
156 | goto exit; | |
157 | } | |
158 | ||
159 | header = (struct acpi_subtable_header *)obj->buffer.pointer; | |
160 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { | |
161 | map_lapic_id(header, acpi_id, &apic_id); | |
162 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { | |
163 | map_lsapic_id(header, type, acpi_id, &apic_id); | |
164 | } | |
165 | ||
166 | exit: | |
167 | if (buffer.pointer) | |
168 | kfree(buffer.pointer); | |
169 | return apic_id; | |
170 | } | |
171 | ||
172 | int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) | |
173 | { | |
174 | int i; | |
175 | int apic_id = -1; | |
176 | ||
177 | apic_id = map_mat_entry(handle, type, acpi_id); | |
178 | if (apic_id == -1) | |
179 | apic_id = map_madt_entry(type, acpi_id); | |
180 | if (apic_id == -1) | |
181 | return apic_id; | |
182 | ||
183 | for_each_possible_cpu(i) { | |
184 | if (cpu_physical_id(i) == apic_id) | |
185 | return i; | |
186 | } | |
187 | return -1; | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(acpi_get_cpuid); | |
190 | #endif | |
191 | ||
5d554a7b AC |
192 | static bool 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 | } | |
78ed8bd2 | 231 | |
08ea48a3 AC |
232 | static void 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; | |
6c5807d7 AC |
239 | |
240 | /* Twiddle arch-specific bits needed for _PDC */ | |
241 | arch_acpi_set_pdc_bits(buf); | |
08ea48a3 AC |
242 | } |
243 | ||
3b407aef | 244 | static struct acpi_object_list *acpi_processor_alloc_pdc(void) |
407cd87c AC |
245 | { |
246 | struct acpi_object_list *obj_list; | |
247 | union acpi_object *obj; | |
248 | u32 *buf; | |
249 | ||
407cd87c AC |
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"); | |
3b407aef | 254 | return NULL; |
407cd87c AC |
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); | |
3b407aef | 261 | return NULL; |
407cd87c AC |
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); | |
3b407aef | 269 | return NULL; |
407cd87c AC |
270 | } |
271 | ||
08ea48a3 AC |
272 | acpi_set_pdc_bits(buf); |
273 | ||
407cd87c AC |
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; | |
407cd87c | 279 | |
3b407aef | 280 | return obj_list; |
407cd87c AC |
281 | } |
282 | ||
78f16996 AC |
283 | /* |
284 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
285 | * ACPI processor features. | |
286 | */ | |
fa118564 AC |
287 | static int |
288 | acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) | |
78f16996 | 289 | { |
78f16996 AC |
290 | acpi_status status = AE_OK; |
291 | ||
78f16996 AC |
292 | if (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 | } | |
fa118564 | 306 | status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); |
78f16996 AC |
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 | ||
43bab25c | 315 | void acpi_processor_set_pdc(acpi_handle handle) |
78f16996 | 316 | { |
3b407aef AC |
317 | struct acpi_object_list *obj_list; |
318 | ||
1d9cb470 AC |
319 | if (arch_has_acpi_pdc() == false) |
320 | return; | |
321 | ||
3b407aef AC |
322 | obj_list = acpi_processor_alloc_pdc(); |
323 | if (!obj_list) | |
324 | return; | |
325 | ||
43bab25c | 326 | acpi_processor_eval_pdc(handle, obj_list); |
b9c2db78 AC |
327 | |
328 | kfree(obj_list->pointer->buffer.pointer); | |
329 | kfree(obj_list->pointer); | |
330 | kfree(obj_list); | |
78f16996 AC |
331 | } |
332 | EXPORT_SYMBOL_GPL(acpi_processor_set_pdc); | |
333 | ||
334 | static acpi_status | |
335 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) | |
336 | { | |
5d554a7b AC |
337 | if (processor_physically_present(handle) == false) |
338 | return AE_OK; | |
339 | ||
43bab25c | 340 | acpi_processor_set_pdc(handle); |
78f16996 AC |
341 | return AE_OK; |
342 | } | |
343 | ||
7a0b73a4 | 344 | void __init acpi_early_processor_set_pdc(void) |
78f16996 AC |
345 | { |
346 | /* | |
347 | * Check whether the system is DMI table. If yes, OSPM | |
348 | * should not use mwait for CPU-states. | |
349 | */ | |
350 | dmi_check_system(processor_idle_dmi_table); | |
351 | ||
352 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
353 | ACPI_UINT32_MAX, | |
354 | early_init_pdc, NULL, NULL, NULL); | |
355 | } |