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 | */ | |
214f2c90 | 10 | #include <linux/export.h> |
78f16996 | 11 | #include <linux/dmi.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
78f16996 AC |
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 | |
4d5d4cd8 | 21 | ACPI_MODULE_NAME("processor_core"); |
78f16996 | 22 | |
6430c9c1 | 23 | static int __init set_no_mwait(const struct dmi_system_id *id) |
78f16996 AC |
24 | { |
25 | printk(KERN_NOTICE PREFIX "%s detected - " | |
26 | "disabling mwait for CPU C-states\n", id->ident); | |
d1896049 | 27 | boot_option_idle_override = IDLE_NOMWAIT; |
78f16996 AC |
28 | return 0; |
29 | } | |
30 | ||
6430c9c1 | 31 | static struct dmi_system_id __initdata processor_idle_dmi_table[] = { |
78f16996 AC |
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 | ||
78ed8bd2 AC |
41 | static 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; | |
11130736 AC |
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; | |
78ed8bd2 AC |
55 | } |
56 | ||
57 | static 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; | |
78ed8bd2 | 62 | |
78ed8bd2 AC |
63 | if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) |
64 | return 0; | |
65 | ||
d6742095 AC |
66 | if (device_declaration && (apic->uid == acpi_id)) { |
67 | *apic_id = apic->local_apic_id; | |
68 | return 1; | |
78ed8bd2 AC |
69 | } |
70 | ||
71 | return 0; | |
78ed8bd2 AC |
72 | } |
73 | ||
74 | static 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; | |
78ed8bd2 | 79 | |
78ed8bd2 AC |
80 | if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) |
81 | return 0; | |
82 | ||
78ed8bd2 | 83 | if (device_declaration) { |
eae701ce AC |
84 | if ((entry->length < 16) || (lsapic->uid != acpi_id)) |
85 | return 0; | |
86 | } else if (lsapic->processor_id != acpi_id) | |
87 | return 0; | |
78ed8bd2 | 88 | |
eae701ce | 89 | *apic_id = (lsapic->id << 8) | lsapic->eid; |
78ed8bd2 AC |
90 | return 1; |
91 | } | |
92 | ||
93 | static int map_madt_entry(int type, u32 acpi_id) | |
94 | { | |
95 | unsigned long madt_end, entry; | |
149fe9c2 AC |
96 | static struct acpi_table_madt *madt; |
97 | static int read_madt; | |
78ed8bd2 AC |
98 | int apic_id = -1; |
99 | ||
149fe9c2 AC |
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 | ||
78ed8bd2 AC |
107 | if (!madt) |
108 | return apic_id; | |
109 | ||
110 | entry = (unsigned long)madt; | |
111 | madt_end = entry + madt->header.length; | |
112 | ||
113 | /* Parse all entries looking for a match. */ | |
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 | ||
134 | static 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 | ||
160 | exit: | |
161 | if (buffer.pointer) | |
162 | kfree(buffer.pointer); | |
163 | return apic_id; | |
164 | } | |
165 | ||
166 | int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) | |
167 | { | |
932df741 | 168 | #ifdef CONFIG_SMP |
78ed8bd2 | 169 | int i; |
932df741 | 170 | #endif |
78ed8bd2 AC |
171 | int apic_id = -1; |
172 | ||
173 | apic_id = map_mat_entry(handle, type, acpi_id); | |
174 | if (apic_id == -1) | |
175 | apic_id = map_madt_entry(type, acpi_id); | |
d640113f LM |
176 | if (apic_id == -1) { |
177 | /* | |
178 | * On UP processor, there is no _MAT or MADT table. | |
179 | * So above apic_id is always set to -1. | |
180 | * | |
181 | * BIOS may define multiple CPU handles even for UP processor. | |
182 | * For example, | |
183 | * | |
184 | * Scope (_PR) | |
185 | * { | |
186 | * Processor (CPU0, 0x00, 0x00000410, 0x06) {} | |
187 | * Processor (CPU1, 0x01, 0x00000410, 0x06) {} | |
188 | * Processor (CPU2, 0x02, 0x00000410, 0x06) {} | |
189 | * Processor (CPU3, 0x03, 0x00000410, 0x06) {} | |
190 | * } | |
191 | * | |
c4686c71 TR |
192 | * Ignores apic_id and always returns 0 for the processor |
193 | * handle with acpi id 0 if nr_cpu_ids is 1. | |
194 | * This should be the case if SMP tables are not found. | |
d640113f LM |
195 | * Return -1 for other CPU's handle. |
196 | */ | |
c4686c71 | 197 | if (nr_cpu_ids <= 1 && acpi_id == 0) |
d640113f LM |
198 | return acpi_id; |
199 | else | |
200 | return apic_id; | |
201 | } | |
78ed8bd2 | 202 | |
932df741 | 203 | #ifdef CONFIG_SMP |
78ed8bd2 AC |
204 | for_each_possible_cpu(i) { |
205 | if (cpu_physical_id(i) == apic_id) | |
206 | return i; | |
207 | } | |
932df741 LM |
208 | #else |
209 | /* In UP kernel, only processor 0 is valid */ | |
210 | if (apic_id == 0) | |
211 | return apic_id; | |
212 | #endif | |
78ed8bd2 AC |
213 | return -1; |
214 | } | |
215 | EXPORT_SYMBOL_GPL(acpi_get_cpuid); | |
78ed8bd2 | 216 | |
6430c9c1 | 217 | static bool __init processor_physically_present(acpi_handle handle) |
5d554a7b AC |
218 | { |
219 | int cpuid, type; | |
220 | u32 acpi_id; | |
221 | acpi_status status; | |
222 | acpi_object_type acpi_type; | |
223 | unsigned long long tmp; | |
224 | union acpi_object object = { 0 }; | |
225 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
226 | ||
227 | status = acpi_get_type(handle, &acpi_type); | |
228 | if (ACPI_FAILURE(status)) | |
229 | return false; | |
230 | ||
231 | switch (acpi_type) { | |
232 | case ACPI_TYPE_PROCESSOR: | |
233 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); | |
234 | if (ACPI_FAILURE(status)) | |
235 | return false; | |
236 | acpi_id = object.processor.proc_id; | |
237 | break; | |
238 | case ACPI_TYPE_DEVICE: | |
239 | status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); | |
240 | if (ACPI_FAILURE(status)) | |
241 | return false; | |
242 | acpi_id = tmp; | |
243 | break; | |
244 | default: | |
245 | return false; | |
246 | } | |
247 | ||
248 | type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; | |
249 | cpuid = acpi_get_cpuid(handle, type, acpi_id); | |
250 | ||
932df741 | 251 | if (cpuid == -1) |
5d554a7b AC |
252 | return false; |
253 | ||
254 | return true; | |
255 | } | |
78ed8bd2 | 256 | |
af10f941 | 257 | static void __cpuinit acpi_set_pdc_bits(u32 *buf) |
08ea48a3 AC |
258 | { |
259 | buf[0] = ACPI_PDC_REVISION_ID; | |
260 | buf[1] = 1; | |
261 | ||
262 | /* Enable coordination with firmware's _TSD info */ | |
263 | buf[2] = ACPI_PDC_SMP_T_SWCOORD; | |
6c5807d7 AC |
264 | |
265 | /* Twiddle arch-specific bits needed for _PDC */ | |
266 | arch_acpi_set_pdc_bits(buf); | |
08ea48a3 AC |
267 | } |
268 | ||
af10f941 | 269 | static struct acpi_object_list *__cpuinit acpi_processor_alloc_pdc(void) |
407cd87c AC |
270 | { |
271 | struct acpi_object_list *obj_list; | |
272 | union acpi_object *obj; | |
273 | u32 *buf; | |
274 | ||
407cd87c AC |
275 | /* allocate and initialize pdc. It will be used later. */ |
276 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); | |
277 | if (!obj_list) { | |
278 | printk(KERN_ERR "Memory allocation error\n"); | |
3b407aef | 279 | return NULL; |
407cd87c AC |
280 | } |
281 | ||
282 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | |
283 | if (!obj) { | |
284 | printk(KERN_ERR "Memory allocation error\n"); | |
285 | kfree(obj_list); | |
3b407aef | 286 | return NULL; |
407cd87c AC |
287 | } |
288 | ||
289 | buf = kmalloc(12, GFP_KERNEL); | |
290 | if (!buf) { | |
291 | printk(KERN_ERR "Memory allocation error\n"); | |
292 | kfree(obj); | |
293 | kfree(obj_list); | |
3b407aef | 294 | return NULL; |
407cd87c AC |
295 | } |
296 | ||
08ea48a3 AC |
297 | acpi_set_pdc_bits(buf); |
298 | ||
407cd87c AC |
299 | obj->type = ACPI_TYPE_BUFFER; |
300 | obj->buffer.length = 12; | |
301 | obj->buffer.pointer = (u8 *) buf; | |
302 | obj_list->count = 1; | |
303 | obj_list->pointer = obj; | |
407cd87c | 304 | |
3b407aef | 305 | return obj_list; |
407cd87c AC |
306 | } |
307 | ||
78f16996 AC |
308 | /* |
309 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
310 | * ACPI processor features. | |
311 | */ | |
af10f941 | 312 | static int __cpuinit |
fa118564 | 313 | acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) |
78f16996 | 314 | { |
78f16996 AC |
315 | acpi_status status = AE_OK; |
316 | ||
d1896049 | 317 | if (boot_option_idle_override == IDLE_NOMWAIT) { |
78f16996 AC |
318 | /* |
319 | * If mwait is disabled for CPU C-states, the C2C3_FFH access | |
320 | * mode will be disabled in the parameter of _PDC object. | |
321 | * Of course C1_FFH access mode will also be disabled. | |
322 | */ | |
323 | union acpi_object *obj; | |
324 | u32 *buffer = NULL; | |
325 | ||
326 | obj = pdc_in->pointer; | |
327 | buffer = (u32 *)(obj->buffer.pointer); | |
328 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); | |
329 | ||
330 | } | |
fa118564 | 331 | status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); |
78f16996 AC |
332 | |
333 | if (ACPI_FAILURE(status)) | |
334 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
335 | "Could not evaluate _PDC, using legacy perf. control.\n")); | |
336 | ||
337 | return status; | |
338 | } | |
339 | ||
af10f941 | 340 | void __cpuinit acpi_processor_set_pdc(acpi_handle handle) |
78f16996 | 341 | { |
3b407aef AC |
342 | struct acpi_object_list *obj_list; |
343 | ||
1d9cb470 AC |
344 | if (arch_has_acpi_pdc() == false) |
345 | return; | |
346 | ||
3b407aef AC |
347 | obj_list = acpi_processor_alloc_pdc(); |
348 | if (!obj_list) | |
349 | return; | |
350 | ||
43bab25c | 351 | acpi_processor_eval_pdc(handle, obj_list); |
b9c2db78 AC |
352 | |
353 | kfree(obj_list->pointer->buffer.pointer); | |
354 | kfree(obj_list->pointer); | |
355 | kfree(obj_list); | |
78f16996 | 356 | } |
78f16996 | 357 | |
6430c9c1 | 358 | static acpi_status __init |
78f16996 AC |
359 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) |
360 | { | |
5d554a7b AC |
361 | if (processor_physically_present(handle) == false) |
362 | return AE_OK; | |
363 | ||
43bab25c | 364 | acpi_processor_set_pdc(handle); |
78f16996 AC |
365 | return AE_OK; |
366 | } | |
367 | ||
7a0b73a4 | 368 | void __init acpi_early_processor_set_pdc(void) |
78f16996 AC |
369 | { |
370 | /* | |
371 | * Check whether the system is DMI table. If yes, OSPM | |
372 | * should not use mwait for CPU-states. | |
373 | */ | |
374 | dmi_check_system(processor_idle_dmi_table); | |
375 | ||
376 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
377 | ACPI_UINT32_MAX, | |
378 | early_init_pdc, NULL, NULL, NULL); | |
c1e0ddbf | 379 | acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL); |
78f16996 | 380 | } |