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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 | */ | |
214f2c90 | 10 | #include <linux/export.h> |
78f16996 | 11 | #include <linux/dmi.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
8b48463f | 13 | #include <linux/acpi.h> |
78f16996 AC |
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 | 21 | |
6430c9c1 | 22 | static int __init set_no_mwait(const struct dmi_system_id *id) |
78f16996 AC |
23 | { |
24 | printk(KERN_NOTICE PREFIX "%s detected - " | |
25 | "disabling mwait for CPU C-states\n", id->ident); | |
d1896049 | 26 | boot_option_idle_override = IDLE_NOMWAIT; |
78f16996 AC |
27 | return 0; |
28 | } | |
29 | ||
8ef9fc78 | 30 | static struct dmi_system_id processor_idle_dmi_table[] __initdata = { |
78f16996 AC |
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 | ||
78ed8bd2 AC |
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; | |
11130736 AC |
45 | |
46 | if (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) | |
038d7b59 | 47 | return -ENODEV; |
11130736 AC |
48 | |
49 | if (lapic->processor_id != acpi_id) | |
038d7b59 | 50 | return -EINVAL; |
11130736 AC |
51 | |
52 | *apic_id = lapic->id; | |
038d7b59 | 53 | return 0; |
78ed8bd2 AC |
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; | |
78ed8bd2 | 61 | |
78ed8bd2 | 62 | if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) |
038d7b59 | 63 | return -ENODEV; |
78ed8bd2 | 64 | |
d6742095 AC |
65 | if (device_declaration && (apic->uid == acpi_id)) { |
66 | *apic_id = apic->local_apic_id; | |
038d7b59 | 67 | return 0; |
78ed8bd2 AC |
68 | } |
69 | ||
038d7b59 | 70 | return -EINVAL; |
78ed8bd2 AC |
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; | |
78ed8bd2 | 78 | |
78ed8bd2 | 79 | if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) |
038d7b59 | 80 | return -ENODEV; |
78ed8bd2 | 81 | |
78ed8bd2 | 82 | if (device_declaration) { |
eae701ce | 83 | if ((entry->length < 16) || (lsapic->uid != acpi_id)) |
038d7b59 | 84 | return -EINVAL; |
eae701ce | 85 | } else if (lsapic->processor_id != acpi_id) |
038d7b59 | 86 | return -EINVAL; |
78ed8bd2 | 87 | |
eae701ce | 88 | *apic_id = (lsapic->id << 8) | lsapic->eid; |
038d7b59 | 89 | return 0; |
78ed8bd2 AC |
90 | } |
91 | ||
92 | static int map_madt_entry(int type, u32 acpi_id) | |
93 | { | |
94 | unsigned long madt_end, entry; | |
149fe9c2 AC |
95 | static struct acpi_table_madt *madt; |
96 | static int read_madt; | |
78ed8bd2 AC |
97 | int apic_id = -1; |
98 | ||
149fe9c2 AC |
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 | ||
78ed8bd2 AC |
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) { | |
038d7b59 | 119 | if (!map_lapic_id(header, acpi_id, &apic_id)) |
78ed8bd2 AC |
120 | break; |
121 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { | |
038d7b59 | 122 | if (!map_x2apic_id(header, type, acpi_id, &apic_id)) |
78ed8bd2 AC |
123 | break; |
124 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { | |
038d7b59 | 125 | if (!map_lsapic_id(header, type, acpi_id, &apic_id)) |
78ed8bd2 AC |
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: | |
5273a258 | 160 | kfree(buffer.pointer); |
78ed8bd2 AC |
161 | return apic_id; |
162 | } | |
163 | ||
ca9f62ac | 164 | int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id) |
78ed8bd2 | 165 | { |
ca9f62ac | 166 | int apic_id; |
78ed8bd2 AC |
167 | |
168 | apic_id = map_mat_entry(handle, type, acpi_id); | |
169 | if (apic_id == -1) | |
170 | apic_id = map_madt_entry(type, acpi_id); | |
ca9f62ac JL |
171 | |
172 | return apic_id; | |
173 | } | |
174 | ||
175 | int acpi_map_cpuid(int apic_id, u32 acpi_id) | |
176 | { | |
177 | #ifdef CONFIG_SMP | |
178 | int i; | |
179 | #endif | |
180 | ||
d640113f LM |
181 | if (apic_id == -1) { |
182 | /* | |
183 | * On UP processor, there is no _MAT or MADT table. | |
184 | * So above apic_id is always set to -1. | |
185 | * | |
186 | * BIOS may define multiple CPU handles even for UP processor. | |
187 | * For example, | |
188 | * | |
189 | * Scope (_PR) | |
190 | * { | |
191 | * Processor (CPU0, 0x00, 0x00000410, 0x06) {} | |
192 | * Processor (CPU1, 0x01, 0x00000410, 0x06) {} | |
193 | * Processor (CPU2, 0x02, 0x00000410, 0x06) {} | |
194 | * Processor (CPU3, 0x03, 0x00000410, 0x06) {} | |
195 | * } | |
196 | * | |
c4686c71 TR |
197 | * Ignores apic_id and always returns 0 for the processor |
198 | * handle with acpi id 0 if nr_cpu_ids is 1. | |
199 | * This should be the case if SMP tables are not found. | |
d640113f LM |
200 | * Return -1 for other CPU's handle. |
201 | */ | |
c4686c71 | 202 | if (nr_cpu_ids <= 1 && acpi_id == 0) |
d640113f LM |
203 | return acpi_id; |
204 | else | |
205 | return apic_id; | |
206 | } | |
78ed8bd2 | 207 | |
932df741 | 208 | #ifdef CONFIG_SMP |
78ed8bd2 AC |
209 | for_each_possible_cpu(i) { |
210 | if (cpu_physical_id(i) == apic_id) | |
211 | return i; | |
212 | } | |
932df741 LM |
213 | #else |
214 | /* In UP kernel, only processor 0 is valid */ | |
215 | if (apic_id == 0) | |
216 | return apic_id; | |
217 | #endif | |
78ed8bd2 AC |
218 | return -1; |
219 | } | |
ca9f62ac JL |
220 | |
221 | int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) | |
222 | { | |
223 | int apic_id; | |
224 | ||
225 | apic_id = acpi_get_apicid(handle, type, acpi_id); | |
226 | ||
227 | return acpi_map_cpuid(apic_id, acpi_id); | |
228 | } | |
78ed8bd2 | 229 | EXPORT_SYMBOL_GPL(acpi_get_cpuid); |
78ed8bd2 | 230 | |
6430c9c1 | 231 | static bool __init processor_physically_present(acpi_handle handle) |
5d554a7b AC |
232 | { |
233 | int cpuid, type; | |
234 | u32 acpi_id; | |
235 | acpi_status status; | |
236 | acpi_object_type acpi_type; | |
237 | unsigned long long tmp; | |
238 | union acpi_object object = { 0 }; | |
239 | struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; | |
240 | ||
241 | status = acpi_get_type(handle, &acpi_type); | |
242 | if (ACPI_FAILURE(status)) | |
243 | return false; | |
244 | ||
245 | switch (acpi_type) { | |
246 | case ACPI_TYPE_PROCESSOR: | |
247 | status = acpi_evaluate_object(handle, NULL, NULL, &buffer); | |
248 | if (ACPI_FAILURE(status)) | |
249 | return false; | |
250 | acpi_id = object.processor.proc_id; | |
251 | break; | |
252 | case ACPI_TYPE_DEVICE: | |
253 | status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); | |
254 | if (ACPI_FAILURE(status)) | |
255 | return false; | |
256 | acpi_id = tmp; | |
257 | break; | |
258 | default: | |
259 | return false; | |
260 | } | |
261 | ||
262 | type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; | |
263 | cpuid = acpi_get_cpuid(handle, type, acpi_id); | |
264 | ||
932df741 | 265 | if (cpuid == -1) |
5d554a7b AC |
266 | return false; |
267 | ||
268 | return true; | |
269 | } | |
78ed8bd2 | 270 | |
fe7bf106 | 271 | static void acpi_set_pdc_bits(u32 *buf) |
08ea48a3 AC |
272 | { |
273 | buf[0] = ACPI_PDC_REVISION_ID; | |
274 | buf[1] = 1; | |
275 | ||
276 | /* Enable coordination with firmware's _TSD info */ | |
277 | buf[2] = ACPI_PDC_SMP_T_SWCOORD; | |
6c5807d7 AC |
278 | |
279 | /* Twiddle arch-specific bits needed for _PDC */ | |
280 | arch_acpi_set_pdc_bits(buf); | |
08ea48a3 AC |
281 | } |
282 | ||
fe7bf106 | 283 | static struct acpi_object_list *acpi_processor_alloc_pdc(void) |
407cd87c AC |
284 | { |
285 | struct acpi_object_list *obj_list; | |
286 | union acpi_object *obj; | |
287 | u32 *buf; | |
288 | ||
407cd87c AC |
289 | /* allocate and initialize pdc. It will be used later. */ |
290 | obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); | |
291 | if (!obj_list) { | |
292 | printk(KERN_ERR "Memory allocation error\n"); | |
3b407aef | 293 | return NULL; |
407cd87c AC |
294 | } |
295 | ||
296 | obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); | |
297 | if (!obj) { | |
298 | printk(KERN_ERR "Memory allocation error\n"); | |
299 | kfree(obj_list); | |
3b407aef | 300 | return NULL; |
407cd87c AC |
301 | } |
302 | ||
303 | buf = kmalloc(12, GFP_KERNEL); | |
304 | if (!buf) { | |
305 | printk(KERN_ERR "Memory allocation error\n"); | |
306 | kfree(obj); | |
307 | kfree(obj_list); | |
3b407aef | 308 | return NULL; |
407cd87c AC |
309 | } |
310 | ||
08ea48a3 AC |
311 | acpi_set_pdc_bits(buf); |
312 | ||
407cd87c AC |
313 | obj->type = ACPI_TYPE_BUFFER; |
314 | obj->buffer.length = 12; | |
315 | obj->buffer.pointer = (u8 *) buf; | |
316 | obj_list->count = 1; | |
317 | obj_list->pointer = obj; | |
407cd87c | 318 | |
3b407aef | 319 | return obj_list; |
407cd87c AC |
320 | } |
321 | ||
78f16996 AC |
322 | /* |
323 | * _PDC is required for a BIOS-OS handshake for most of the newer | |
324 | * ACPI processor features. | |
325 | */ | |
fe7bf106 | 326 | static int |
fa118564 | 327 | acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) |
78f16996 | 328 | { |
78f16996 AC |
329 | acpi_status status = AE_OK; |
330 | ||
d1896049 | 331 | if (boot_option_idle_override == IDLE_NOMWAIT) { |
78f16996 AC |
332 | /* |
333 | * If mwait is disabled for CPU C-states, the C2C3_FFH access | |
334 | * mode will be disabled in the parameter of _PDC object. | |
335 | * Of course C1_FFH access mode will also be disabled. | |
336 | */ | |
337 | union acpi_object *obj; | |
338 | u32 *buffer = NULL; | |
339 | ||
340 | obj = pdc_in->pointer; | |
341 | buffer = (u32 *)(obj->buffer.pointer); | |
342 | buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); | |
343 | ||
344 | } | |
fa118564 | 345 | status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); |
78f16996 AC |
346 | |
347 | if (ACPI_FAILURE(status)) | |
348 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
349 | "Could not evaluate _PDC, using legacy perf. control.\n")); | |
350 | ||
351 | return status; | |
352 | } | |
353 | ||
fe7bf106 | 354 | void acpi_processor_set_pdc(acpi_handle handle) |
78f16996 | 355 | { |
3b407aef AC |
356 | struct acpi_object_list *obj_list; |
357 | ||
1d9cb470 AC |
358 | if (arch_has_acpi_pdc() == false) |
359 | return; | |
360 | ||
3b407aef AC |
361 | obj_list = acpi_processor_alloc_pdc(); |
362 | if (!obj_list) | |
363 | return; | |
364 | ||
43bab25c | 365 | acpi_processor_eval_pdc(handle, obj_list); |
b9c2db78 AC |
366 | |
367 | kfree(obj_list->pointer->buffer.pointer); | |
368 | kfree(obj_list->pointer); | |
369 | kfree(obj_list); | |
78f16996 | 370 | } |
78f16996 | 371 | |
6430c9c1 | 372 | static acpi_status __init |
78f16996 AC |
373 | early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) |
374 | { | |
5d554a7b AC |
375 | if (processor_physically_present(handle) == false) |
376 | return AE_OK; | |
377 | ||
43bab25c | 378 | acpi_processor_set_pdc(handle); |
78f16996 AC |
379 | return AE_OK; |
380 | } | |
381 | ||
7a0b73a4 | 382 | void __init acpi_early_processor_set_pdc(void) |
78f16996 AC |
383 | { |
384 | /* | |
385 | * Check whether the system is DMI table. If yes, OSPM | |
386 | * should not use mwait for CPU-states. | |
387 | */ | |
388 | dmi_check_system(processor_idle_dmi_table); | |
389 | ||
390 | acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, | |
391 | ACPI_UINT32_MAX, | |
392 | early_init_pdc, NULL, NULL, NULL); | |
c1e0ddbf | 393 | acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL); |
78f16996 | 394 | } |