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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2005 Intel Corporation
4 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
5 *
6 * Alex Chiang <achiang@hp.com>
7 * - Unified x86/ia64 implementations
8 *
9 * I/O APIC hotplug support
10 * Yinghai Lu <yinghai@kernel.org>
11 * Jiang Liu <jiang.liu@intel.com>
12 */
13#include <linux/export.h>
14#include <linux/acpi.h>
15#include <acpi/processor.h>
16
17static struct acpi_table_madt *get_madt_table(void)
18{
19 static struct acpi_table_madt *madt;
20 static int read_madt;
21
22 if (!read_madt) {
23 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
24 (struct acpi_table_header **)&madt)))
25 madt = NULL;
26 read_madt++;
27 }
28
29 return madt;
30}
31
32static int map_lapic_id(struct acpi_subtable_header *entry,
33 u32 acpi_id, phys_cpuid_t *apic_id)
34{
35 struct acpi_madt_local_apic *lapic =
36 container_of(entry, struct acpi_madt_local_apic, header);
37
38 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
39 return -ENODEV;
40
41 if (lapic->processor_id != acpi_id)
42 return -EINVAL;
43
44 *apic_id = lapic->id;
45 return 0;
46}
47
48static int map_x2apic_id(struct acpi_subtable_header *entry,
49 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
50{
51 struct acpi_madt_local_x2apic *apic =
52 container_of(entry, struct acpi_madt_local_x2apic, header);
53
54 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
55 return -ENODEV;
56
57 if (device_declaration && (apic->uid == acpi_id)) {
58 *apic_id = apic->local_apic_id;
59 return 0;
60 }
61
62 return -EINVAL;
63}
64
65static int map_lsapic_id(struct acpi_subtable_header *entry,
66 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
67{
68 struct acpi_madt_local_sapic *lsapic =
69 container_of(entry, struct acpi_madt_local_sapic, header);
70
71 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
72 return -ENODEV;
73
74 if (device_declaration) {
75 if ((entry->length < 16) || (lsapic->uid != acpi_id))
76 return -EINVAL;
77 } else if (lsapic->processor_id != acpi_id)
78 return -EINVAL;
79
80 *apic_id = (lsapic->id << 8) | lsapic->eid;
81 return 0;
82}
83
84/*
85 * Retrieve the ARM CPU physical identifier (MPIDR)
86 */
87static int map_gicc_mpidr(struct acpi_subtable_header *entry,
88 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr)
89{
90 struct acpi_madt_generic_interrupt *gicc =
91 container_of(entry, struct acpi_madt_generic_interrupt, header);
92
93 if (!(gicc->flags &
94 (ACPI_MADT_ENABLED | ACPI_MADT_GICC_ONLINE_CAPABLE)))
95 return -ENODEV;
96
97 /* device_declaration means Device object in DSDT, in the
98 * GIC interrupt model, logical processors are required to
99 * have a Processor Device object in the DSDT, so we should
100 * check device_declaration here
101 */
102 if (device_declaration && (gicc->uid == acpi_id)) {
103 *mpidr = gicc->arm_mpidr;
104 return 0;
105 }
106
107 return -EINVAL;
108}
109
110/*
111 * Retrieve the RISC-V hartid for the processor
112 */
113static int map_rintc_hartid(struct acpi_subtable_header *entry,
114 int device_declaration, u32 acpi_id,
115 phys_cpuid_t *hartid)
116{
117 struct acpi_madt_rintc *rintc =
118 container_of(entry, struct acpi_madt_rintc, header);
119
120 if (!(rintc->flags & ACPI_MADT_ENABLED))
121 return -ENODEV;
122
123 /* device_declaration means Device object in DSDT, in the
124 * RISC-V, logical processors are required to
125 * have a Processor Device object in the DSDT, so we should
126 * check device_declaration here
127 */
128 if (device_declaration && rintc->uid == acpi_id) {
129 *hartid = rintc->hart_id;
130 return 0;
131 }
132
133 return -EINVAL;
134}
135
136/*
137 * Retrieve LoongArch CPU physical id
138 */
139static int map_core_pic_id(struct acpi_subtable_header *entry,
140 int device_declaration, u32 acpi_id, phys_cpuid_t *phys_id)
141{
142 struct acpi_madt_core_pic *core_pic =
143 container_of(entry, struct acpi_madt_core_pic, header);
144
145 if (!(core_pic->flags & ACPI_MADT_ENABLED))
146 return -ENODEV;
147
148 /* device_declaration means Device object in DSDT, in LoongArch
149 * system, logical processor acpi_id is required in _UID property
150 * of DSDT table, so we should check device_declaration here
151 */
152 if (device_declaration && (core_pic->processor_id == acpi_id)) {
153 *phys_id = core_pic->core_id;
154 return 0;
155 }
156
157 return -EINVAL;
158}
159
160static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
161 int type, u32 acpi_id)
162{
163 unsigned long madt_end, entry;
164 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
165
166 if (!madt)
167 return phys_id;
168
169 entry = (unsigned long)madt;
170 madt_end = entry + madt->header.length;
171
172 /* Parse all entries looking for a match. */
173
174 entry += sizeof(struct acpi_table_madt);
175 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
176 struct acpi_subtable_header *header =
177 (struct acpi_subtable_header *)entry;
178 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
179 if (!map_lapic_id(header, acpi_id, &phys_id))
180 break;
181 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
182 if (!map_x2apic_id(header, type, acpi_id, &phys_id))
183 break;
184 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
185 if (!map_lsapic_id(header, type, acpi_id, &phys_id))
186 break;
187 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
188 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))
189 break;
190 } else if (header->type == ACPI_MADT_TYPE_RINTC) {
191 if (!map_rintc_hartid(header, type, acpi_id, &phys_id))
192 break;
193 } else if (header->type == ACPI_MADT_TYPE_CORE_PIC) {
194 if (!map_core_pic_id(header, type, acpi_id, &phys_id))
195 break;
196 }
197 entry += header->length;
198 }
199 return phys_id;
200}
201
202phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
203{
204 struct acpi_table_madt *madt = NULL;
205 phys_cpuid_t rv;
206
207 acpi_get_table(ACPI_SIG_MADT, 0,
208 (struct acpi_table_header **)&madt);
209 if (!madt)
210 return PHYS_CPUID_INVALID;
211
212 rv = map_madt_entry(madt, 1, acpi_id);
213
214 acpi_put_table((struct acpi_table_header *)madt);
215
216 return rv;
217}
218
219int __init acpi_get_madt_revision(void)
220{
221 struct acpi_table_header *madt = NULL;
222 int revision;
223
224 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, &madt)))
225 return -EINVAL;
226
227 revision = madt->revision;
228
229 acpi_put_table(madt);
230
231 return revision;
232}
233
234static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
235{
236 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
237 union acpi_object *obj;
238 struct acpi_subtable_header *header;
239 phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
240
241 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
242 goto exit;
243
244 if (!buffer.length || !buffer.pointer)
245 goto exit;
246
247 obj = buffer.pointer;
248 if (obj->type != ACPI_TYPE_BUFFER ||
249 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
250 goto exit;
251 }
252
253 header = (struct acpi_subtable_header *)obj->buffer.pointer;
254 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
255 map_lapic_id(header, acpi_id, &phys_id);
256 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
257 map_lsapic_id(header, type, acpi_id, &phys_id);
258 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
259 map_x2apic_id(header, type, acpi_id, &phys_id);
260 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
261 map_gicc_mpidr(header, type, acpi_id, &phys_id);
262 else if (header->type == ACPI_MADT_TYPE_CORE_PIC)
263 map_core_pic_id(header, type, acpi_id, &phys_id);
264
265exit:
266 kfree(buffer.pointer);
267 return phys_id;
268}
269
270phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
271{
272 phys_cpuid_t phys_id;
273
274 phys_id = map_mat_entry(handle, type, acpi_id);
275 if (invalid_phys_cpuid(phys_id))
276 phys_id = map_madt_entry(get_madt_table(), type, acpi_id);
277
278 return phys_id;
279}
280EXPORT_SYMBOL_GPL(acpi_get_phys_id);
281
282int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
283{
284#ifdef CONFIG_SMP
285 int i;
286#endif
287
288 if (invalid_phys_cpuid(phys_id)) {
289 /*
290 * On UP processor, there is no _MAT or MADT table.
291 * So above phys_id is always set to PHYS_CPUID_INVALID.
292 *
293 * BIOS may define multiple CPU handles even for UP processor.
294 * For example,
295 *
296 * Scope (_PR)
297 * {
298 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
299 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
300 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
301 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
302 * }
303 *
304 * Ignores phys_id and always returns 0 for the processor
305 * handle with acpi id 0 if nr_cpu_ids is 1.
306 * This should be the case if SMP tables are not found.
307 * Return -EINVAL for other CPU's handle.
308 */
309 if (nr_cpu_ids <= 1 && acpi_id == 0)
310 return acpi_id;
311 else
312 return -EINVAL;
313 }
314
315#ifdef CONFIG_SMP
316 for_each_possible_cpu(i) {
317 if (cpu_physical_id(i) == phys_id)
318 return i;
319 }
320#else
321 /* In UP kernel, only processor 0 is valid */
322 if (phys_id == 0)
323 return phys_id;
324#endif
325 return -ENODEV;
326}
327
328int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
329{
330 phys_cpuid_t phys_id;
331
332 phys_id = acpi_get_phys_id(handle, type, acpi_id);
333
334 return acpi_map_cpuid(phys_id, acpi_id);
335}
336EXPORT_SYMBOL_GPL(acpi_get_cpuid);
337
338#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
339static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
340 u64 *phys_addr, int *ioapic_id)
341{
342 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
343
344 if (ioapic->global_irq_base != gsi_base)
345 return 0;
346
347 *phys_addr = ioapic->address;
348 *ioapic_id = ioapic->id;
349 return 1;
350}
351
352static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
353{
354 struct acpi_subtable_header *hdr;
355 unsigned long madt_end, entry;
356 struct acpi_table_madt *madt;
357 int apic_id = -1;
358
359 madt = get_madt_table();
360 if (!madt)
361 return apic_id;
362
363 entry = (unsigned long)madt;
364 madt_end = entry + madt->header.length;
365
366 /* Parse all entries looking for a match. */
367 entry += sizeof(struct acpi_table_madt);
368 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
369 hdr = (struct acpi_subtable_header *)entry;
370 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
371 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
372 break;
373 else
374 entry += hdr->length;
375 }
376
377 return apic_id;
378}
379
380static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
381 u64 *phys_addr)
382{
383 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
384 struct acpi_subtable_header *header;
385 union acpi_object *obj;
386 int apic_id = -1;
387
388 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
389 goto exit;
390
391 if (!buffer.length || !buffer.pointer)
392 goto exit;
393
394 obj = buffer.pointer;
395 if (obj->type != ACPI_TYPE_BUFFER ||
396 obj->buffer.length < sizeof(struct acpi_subtable_header))
397 goto exit;
398
399 header = (struct acpi_subtable_header *)obj->buffer.pointer;
400 if (header->type == ACPI_MADT_TYPE_IO_APIC)
401 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
402
403exit:
404 kfree(buffer.pointer);
405 return apic_id;
406}
407
408/**
409 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
410 * @handle: ACPI object for IOAPIC device
411 * @gsi_base: GSI base to match with
412 * @phys_addr: Pointer to store physical address of matching IOAPIC record
413 *
414 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
415 * for an ACPI IOAPIC record matching @gsi_base.
416 * Return IOAPIC id and store physical address in @phys_addr if found a match,
417 * otherwise return <0.
418 */
419int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
420{
421 int apic_id;
422
423 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
424 if (apic_id == -1)
425 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
426
427 return apic_id;
428}
429#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */
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/export.h>
11#include <linux/dmi.h>
12#include <linux/slab.h>
13#include <linux/acpi.h>
14#include <acpi/processor.h>
15
16#include "internal.h"
17
18#define _COMPONENT ACPI_PROCESSOR_COMPONENT
19ACPI_MODULE_NAME("processor_core");
20
21static int map_lapic_id(struct acpi_subtable_header *entry,
22 u32 acpi_id, int *apic_id)
23{
24 struct acpi_madt_local_apic *lapic =
25 (struct acpi_madt_local_apic *)entry;
26
27 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
28 return -ENODEV;
29
30 if (lapic->processor_id != acpi_id)
31 return -EINVAL;
32
33 *apic_id = lapic->id;
34 return 0;
35}
36
37static int map_x2apic_id(struct acpi_subtable_header *entry,
38 int device_declaration, u32 acpi_id, int *apic_id)
39{
40 struct acpi_madt_local_x2apic *apic =
41 (struct acpi_madt_local_x2apic *)entry;
42
43 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
44 return -ENODEV;
45
46 if (device_declaration && (apic->uid == acpi_id)) {
47 *apic_id = apic->local_apic_id;
48 return 0;
49 }
50
51 return -EINVAL;
52}
53
54static int map_lsapic_id(struct acpi_subtable_header *entry,
55 int device_declaration, u32 acpi_id, int *apic_id)
56{
57 struct acpi_madt_local_sapic *lsapic =
58 (struct acpi_madt_local_sapic *)entry;
59
60 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
61 return -ENODEV;
62
63 if (device_declaration) {
64 if ((entry->length < 16) || (lsapic->uid != acpi_id))
65 return -EINVAL;
66 } else if (lsapic->processor_id != acpi_id)
67 return -EINVAL;
68
69 *apic_id = (lsapic->id << 8) | lsapic->eid;
70 return 0;
71}
72
73static int map_madt_entry(int type, u32 acpi_id)
74{
75 unsigned long madt_end, entry;
76 static struct acpi_table_madt *madt;
77 static int read_madt;
78 int apic_id = -1;
79
80 if (!read_madt) {
81 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
82 (struct acpi_table_header **)&madt)))
83 madt = NULL;
84 read_madt++;
85 }
86
87 if (!madt)
88 return apic_id;
89
90 entry = (unsigned long)madt;
91 madt_end = entry + madt->header.length;
92
93 /* Parse all entries looking for a match. */
94
95 entry += sizeof(struct acpi_table_madt);
96 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
97 struct acpi_subtable_header *header =
98 (struct acpi_subtable_header *)entry;
99 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
100 if (!map_lapic_id(header, acpi_id, &apic_id))
101 break;
102 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
103 if (!map_x2apic_id(header, type, acpi_id, &apic_id))
104 break;
105 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
106 if (!map_lsapic_id(header, type, acpi_id, &apic_id))
107 break;
108 }
109 entry += header->length;
110 }
111 return apic_id;
112}
113
114static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
115{
116 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
117 union acpi_object *obj;
118 struct acpi_subtable_header *header;
119 int apic_id = -1;
120
121 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
122 goto exit;
123
124 if (!buffer.length || !buffer.pointer)
125 goto exit;
126
127 obj = buffer.pointer;
128 if (obj->type != ACPI_TYPE_BUFFER ||
129 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
130 goto exit;
131 }
132
133 header = (struct acpi_subtable_header *)obj->buffer.pointer;
134 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
135 map_lapic_id(header, acpi_id, &apic_id);
136 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
137 map_lsapic_id(header, type, acpi_id, &apic_id);
138 }
139
140exit:
141 kfree(buffer.pointer);
142 return apic_id;
143}
144
145int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
146{
147 int apic_id;
148
149 apic_id = map_mat_entry(handle, type, acpi_id);
150 if (apic_id == -1)
151 apic_id = map_madt_entry(type, acpi_id);
152
153 return apic_id;
154}
155
156int acpi_map_cpuid(int apic_id, u32 acpi_id)
157{
158#ifdef CONFIG_SMP
159 int i;
160#endif
161
162 if (apic_id == -1) {
163 /*
164 * On UP processor, there is no _MAT or MADT table.
165 * So above apic_id is always set to -1.
166 *
167 * BIOS may define multiple CPU handles even for UP processor.
168 * For example,
169 *
170 * Scope (_PR)
171 * {
172 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
173 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
174 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
175 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
176 * }
177 *
178 * Ignores apic_id and always returns 0 for the processor
179 * handle with acpi id 0 if nr_cpu_ids is 1.
180 * This should be the case if SMP tables are not found.
181 * Return -1 for other CPU's handle.
182 */
183 if (nr_cpu_ids <= 1 && acpi_id == 0)
184 return acpi_id;
185 else
186 return apic_id;
187 }
188
189#ifdef CONFIG_SMP
190 for_each_possible_cpu(i) {
191 if (cpu_physical_id(i) == apic_id)
192 return i;
193 }
194#else
195 /* In UP kernel, only processor 0 is valid */
196 if (apic_id == 0)
197 return apic_id;
198#endif
199 return -1;
200}
201
202int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
203{
204 int apic_id;
205
206 apic_id = acpi_get_apicid(handle, type, acpi_id);
207
208 return acpi_map_cpuid(apic_id, acpi_id);
209}
210EXPORT_SYMBOL_GPL(acpi_get_cpuid);
211
212static bool __init processor_physically_present(acpi_handle handle)
213{
214 int cpuid, type;
215 u32 acpi_id;
216 acpi_status status;
217 acpi_object_type acpi_type;
218 unsigned long long tmp;
219 union acpi_object object = { 0 };
220 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
221
222 status = acpi_get_type(handle, &acpi_type);
223 if (ACPI_FAILURE(status))
224 return false;
225
226 switch (acpi_type) {
227 case ACPI_TYPE_PROCESSOR:
228 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
229 if (ACPI_FAILURE(status))
230 return false;
231 acpi_id = object.processor.proc_id;
232 break;
233 case ACPI_TYPE_DEVICE:
234 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
235 if (ACPI_FAILURE(status))
236 return false;
237 acpi_id = tmp;
238 break;
239 default:
240 return false;
241 }
242
243 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
244 cpuid = acpi_get_cpuid(handle, type, acpi_id);
245
246 if (cpuid == -1)
247 return false;
248
249 return true;
250}
251
252static void acpi_set_pdc_bits(u32 *buf)
253{
254 buf[0] = ACPI_PDC_REVISION_ID;
255 buf[1] = 1;
256
257 /* Enable coordination with firmware's _TSD info */
258 buf[2] = ACPI_PDC_SMP_T_SWCOORD;
259
260 /* Twiddle arch-specific bits needed for _PDC */
261 arch_acpi_set_pdc_bits(buf);
262}
263
264static struct acpi_object_list *acpi_processor_alloc_pdc(void)
265{
266 struct acpi_object_list *obj_list;
267 union acpi_object *obj;
268 u32 *buf;
269
270 /* allocate and initialize pdc. It will be used later. */
271 obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
272 if (!obj_list) {
273 printk(KERN_ERR "Memory allocation error\n");
274 return NULL;
275 }
276
277 obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
278 if (!obj) {
279 printk(KERN_ERR "Memory allocation error\n");
280 kfree(obj_list);
281 return NULL;
282 }
283
284 buf = kmalloc(12, GFP_KERNEL);
285 if (!buf) {
286 printk(KERN_ERR "Memory allocation error\n");
287 kfree(obj);
288 kfree(obj_list);
289 return NULL;
290 }
291
292 acpi_set_pdc_bits(buf);
293
294 obj->type = ACPI_TYPE_BUFFER;
295 obj->buffer.length = 12;
296 obj->buffer.pointer = (u8 *) buf;
297 obj_list->count = 1;
298 obj_list->pointer = obj;
299
300 return obj_list;
301}
302
303/*
304 * _PDC is required for a BIOS-OS handshake for most of the newer
305 * ACPI processor features.
306 */
307static acpi_status
308acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
309{
310 acpi_status status = AE_OK;
311
312 if (boot_option_idle_override == IDLE_NOMWAIT) {
313 /*
314 * If mwait is disabled for CPU C-states, the C2C3_FFH access
315 * mode will be disabled in the parameter of _PDC object.
316 * Of course C1_FFH access mode will also be disabled.
317 */
318 union acpi_object *obj;
319 u32 *buffer = NULL;
320
321 obj = pdc_in->pointer;
322 buffer = (u32 *)(obj->buffer.pointer);
323 buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
324
325 }
326 status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
327
328 if (ACPI_FAILURE(status))
329 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
330 "Could not evaluate _PDC, using legacy perf. control.\n"));
331
332 return status;
333}
334
335void acpi_processor_set_pdc(acpi_handle handle)
336{
337 struct acpi_object_list *obj_list;
338
339 if (arch_has_acpi_pdc() == false)
340 return;
341
342 obj_list = acpi_processor_alloc_pdc();
343 if (!obj_list)
344 return;
345
346 acpi_processor_eval_pdc(handle, obj_list);
347
348 kfree(obj_list->pointer->buffer.pointer);
349 kfree(obj_list->pointer);
350 kfree(obj_list);
351}
352
353static acpi_status __init
354early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
355{
356 if (processor_physically_present(handle) == false)
357 return AE_OK;
358
359 acpi_processor_set_pdc(handle);
360 return AE_OK;
361}
362
363#if defined(CONFIG_X86) || defined(CONFIG_IA64)
364static int __init set_no_mwait(const struct dmi_system_id *id)
365{
366 pr_notice(PREFIX "%s detected - disabling mwait for CPU C-states\n",
367 id->ident);
368 boot_option_idle_override = IDLE_NOMWAIT;
369 return 0;
370}
371
372static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
373 {
374 set_no_mwait, "Extensa 5220", {
375 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
376 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
377 DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
378 DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
379 {},
380};
381
382static void __init processor_dmi_check(void)
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#else
391static inline void processor_dmi_check(void) {}
392#endif
393
394void __init acpi_early_processor_set_pdc(void)
395{
396 processor_dmi_check();
397
398 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
399 ACPI_UINT32_MAX,
400 early_init_pdc, NULL, NULL, NULL);
401 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
402}