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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 (!acpi_gicc_is_usable(gicc))
94 return -ENODEV;
95
96 /* device_declaration means Device object in DSDT, in the
97 * GIC interrupt model, logical processors are required to
98 * have a Processor Device object in the DSDT, so we should
99 * check device_declaration here
100 */
101 if (device_declaration && (gicc->uid == acpi_id)) {
102 *mpidr = gicc->arm_mpidr;
103 return 0;
104 }
105
106 return -EINVAL;
107}
108
109/*
110 * Retrieve the RISC-V hartid for the processor
111 */
112static int map_rintc_hartid(struct acpi_subtable_header *entry,
113 int device_declaration, u32 acpi_id,
114 phys_cpuid_t *hartid)
115{
116 struct acpi_madt_rintc *rintc =
117 container_of(entry, struct acpi_madt_rintc, header);
118
119 if (!(rintc->flags & ACPI_MADT_ENABLED))
120 return -ENODEV;
121
122 /* device_declaration means Device object in DSDT, in the
123 * RISC-V, logical processors are required to
124 * have a Processor Device object in the DSDT, so we should
125 * check device_declaration here
126 */
127 if (device_declaration && rintc->uid == acpi_id) {
128 *hartid = rintc->hart_id;
129 return 0;
130 }
131
132 return -EINVAL;
133}
134
135/*
136 * Retrieve LoongArch CPU physical id
137 */
138static int map_core_pic_id(struct acpi_subtable_header *entry,
139 int device_declaration, u32 acpi_id, phys_cpuid_t *phys_id)
140{
141 struct acpi_madt_core_pic *core_pic =
142 container_of(entry, struct acpi_madt_core_pic, header);
143
144 if (!(core_pic->flags & ACPI_MADT_ENABLED))
145 return -ENODEV;
146
147 /* device_declaration means Device object in DSDT, in LoongArch
148 * system, logical processor acpi_id is required in _UID property
149 * of DSDT table, so we should check device_declaration here
150 */
151 if (device_declaration && (core_pic->processor_id == acpi_id)) {
152 *phys_id = core_pic->core_id;
153 return 0;
154 }
155
156 return -EINVAL;
157}
158
159static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
160 int type, u32 acpi_id)
161{
162 unsigned long madt_end, entry;
163 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
164
165 if (!madt)
166 return phys_id;
167
168 entry = (unsigned long)madt;
169 madt_end = entry + madt->header.length;
170
171 /* Parse all entries looking for a match. */
172
173 entry += sizeof(struct acpi_table_madt);
174 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
175 struct acpi_subtable_header *header =
176 (struct acpi_subtable_header *)entry;
177 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
178 if (!map_lapic_id(header, acpi_id, &phys_id))
179 break;
180 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
181 if (!map_x2apic_id(header, type, acpi_id, &phys_id))
182 break;
183 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
184 if (!map_lsapic_id(header, type, acpi_id, &phys_id))
185 break;
186 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
187 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))
188 break;
189 } else if (header->type == ACPI_MADT_TYPE_RINTC) {
190 if (!map_rintc_hartid(header, type, acpi_id, &phys_id))
191 break;
192 } else if (header->type == ACPI_MADT_TYPE_CORE_PIC) {
193 if (!map_core_pic_id(header, type, acpi_id, &phys_id))
194 break;
195 }
196 entry += header->length;
197 }
198 return phys_id;
199}
200
201phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
202{
203 struct acpi_table_madt *madt = NULL;
204 phys_cpuid_t rv;
205
206 acpi_get_table(ACPI_SIG_MADT, 0,
207 (struct acpi_table_header **)&madt);
208 if (!madt)
209 return PHYS_CPUID_INVALID;
210
211 rv = map_madt_entry(madt, 1, acpi_id);
212
213 acpi_put_table((struct acpi_table_header *)madt);
214
215 return rv;
216}
217
218static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
219{
220 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
221 union acpi_object *obj;
222 struct acpi_subtable_header *header;
223 phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
224
225 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
226 goto exit;
227
228 if (!buffer.length || !buffer.pointer)
229 goto exit;
230
231 obj = buffer.pointer;
232 if (obj->type != ACPI_TYPE_BUFFER ||
233 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
234 goto exit;
235 }
236
237 header = (struct acpi_subtable_header *)obj->buffer.pointer;
238 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
239 map_lapic_id(header, acpi_id, &phys_id);
240 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
241 map_lsapic_id(header, type, acpi_id, &phys_id);
242 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
243 map_x2apic_id(header, type, acpi_id, &phys_id);
244 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
245 map_gicc_mpidr(header, type, acpi_id, &phys_id);
246 else if (header->type == ACPI_MADT_TYPE_CORE_PIC)
247 map_core_pic_id(header, type, acpi_id, &phys_id);
248
249exit:
250 kfree(buffer.pointer);
251 return phys_id;
252}
253
254phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
255{
256 phys_cpuid_t phys_id;
257
258 phys_id = map_mat_entry(handle, type, acpi_id);
259 if (invalid_phys_cpuid(phys_id))
260 phys_id = map_madt_entry(get_madt_table(), type, acpi_id);
261
262 return phys_id;
263}
264EXPORT_SYMBOL_GPL(acpi_get_phys_id);
265
266int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
267{
268#ifdef CONFIG_SMP
269 int i;
270#endif
271
272 if (invalid_phys_cpuid(phys_id)) {
273 /*
274 * On UP processor, there is no _MAT or MADT table.
275 * So above phys_id is always set to PHYS_CPUID_INVALID.
276 *
277 * BIOS may define multiple CPU handles even for UP processor.
278 * For example,
279 *
280 * Scope (_PR)
281 * {
282 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
283 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
284 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
285 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
286 * }
287 *
288 * Ignores phys_id and always returns 0 for the processor
289 * handle with acpi id 0 if nr_cpu_ids is 1.
290 * This should be the case if SMP tables are not found.
291 * Return -EINVAL for other CPU's handle.
292 */
293 if (nr_cpu_ids <= 1 && acpi_id == 0)
294 return acpi_id;
295 else
296 return -EINVAL;
297 }
298
299#ifdef CONFIG_SMP
300 for_each_possible_cpu(i) {
301 if (cpu_physical_id(i) == phys_id)
302 return i;
303 }
304#else
305 /* In UP kernel, only processor 0 is valid */
306 if (phys_id == 0)
307 return phys_id;
308#endif
309 return -ENODEV;
310}
311
312int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
313{
314 phys_cpuid_t phys_id;
315
316 phys_id = acpi_get_phys_id(handle, type, acpi_id);
317
318 return acpi_map_cpuid(phys_id, acpi_id);
319}
320EXPORT_SYMBOL_GPL(acpi_get_cpuid);
321
322#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
323static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
324 u64 *phys_addr, int *ioapic_id)
325{
326 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
327
328 if (ioapic->global_irq_base != gsi_base)
329 return 0;
330
331 *phys_addr = ioapic->address;
332 *ioapic_id = ioapic->id;
333 return 1;
334}
335
336static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
337{
338 struct acpi_subtable_header *hdr;
339 unsigned long madt_end, entry;
340 struct acpi_table_madt *madt;
341 int apic_id = -1;
342
343 madt = get_madt_table();
344 if (!madt)
345 return apic_id;
346
347 entry = (unsigned long)madt;
348 madt_end = entry + madt->header.length;
349
350 /* Parse all entries looking for a match. */
351 entry += sizeof(struct acpi_table_madt);
352 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
353 hdr = (struct acpi_subtable_header *)entry;
354 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
355 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
356 break;
357 else
358 entry += hdr->length;
359 }
360
361 return apic_id;
362}
363
364static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
365 u64 *phys_addr)
366{
367 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
368 struct acpi_subtable_header *header;
369 union acpi_object *obj;
370 int apic_id = -1;
371
372 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
373 goto exit;
374
375 if (!buffer.length || !buffer.pointer)
376 goto exit;
377
378 obj = buffer.pointer;
379 if (obj->type != ACPI_TYPE_BUFFER ||
380 obj->buffer.length < sizeof(struct acpi_subtable_header))
381 goto exit;
382
383 header = (struct acpi_subtable_header *)obj->buffer.pointer;
384 if (header->type == ACPI_MADT_TYPE_IO_APIC)
385 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
386
387exit:
388 kfree(buffer.pointer);
389 return apic_id;
390}
391
392/**
393 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
394 * @handle: ACPI object for IOAPIC device
395 * @gsi_base: GSI base to match with
396 * @phys_addr: Pointer to store physical address of matching IOAPIC record
397 *
398 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
399 * for an ACPI IOAPIC record matching @gsi_base.
400 * Return IOAPIC id and store physical address in @phys_addr if found a match,
401 * otherwise return <0.
402 */
403int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
404{
405 int apic_id;
406
407 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
408 if (apic_id == -1)
409 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
410
411 return apic_id;
412}
413#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}