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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
17#define _COMPONENT ACPI_PROCESSOR_COMPONENT
18ACPI_MODULE_NAME("processor_core");
19
20static struct acpi_table_madt *get_madt_table(void)
21{
22 static struct acpi_table_madt *madt;
23 static int read_madt;
24
25 if (!read_madt) {
26 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
27 (struct acpi_table_header **)&madt)))
28 madt = NULL;
29 read_madt++;
30 }
31
32 return madt;
33}
34
35static int map_lapic_id(struct acpi_subtable_header *entry,
36 u32 acpi_id, phys_cpuid_t *apic_id)
37{
38 struct acpi_madt_local_apic *lapic =
39 container_of(entry, struct acpi_madt_local_apic, header);
40
41 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
42 return -ENODEV;
43
44 if (lapic->processor_id != acpi_id)
45 return -EINVAL;
46
47 *apic_id = lapic->id;
48 return 0;
49}
50
51static int map_x2apic_id(struct acpi_subtable_header *entry,
52 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
53{
54 struct acpi_madt_local_x2apic *apic =
55 container_of(entry, struct acpi_madt_local_x2apic, header);
56
57 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
58 return -ENODEV;
59
60 if (device_declaration && (apic->uid == acpi_id)) {
61 *apic_id = apic->local_apic_id;
62 return 0;
63 }
64
65 return -EINVAL;
66}
67
68static int map_lsapic_id(struct acpi_subtable_header *entry,
69 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
70{
71 struct acpi_madt_local_sapic *lsapic =
72 container_of(entry, struct acpi_madt_local_sapic, header);
73
74 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
75 return -ENODEV;
76
77 if (device_declaration) {
78 if ((entry->length < 16) || (lsapic->uid != acpi_id))
79 return -EINVAL;
80 } else if (lsapic->processor_id != acpi_id)
81 return -EINVAL;
82
83 *apic_id = (lsapic->id << 8) | lsapic->eid;
84 return 0;
85}
86
87/*
88 * Retrieve the ARM CPU physical identifier (MPIDR)
89 */
90static int map_gicc_mpidr(struct acpi_subtable_header *entry,
91 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr)
92{
93 struct acpi_madt_generic_interrupt *gicc =
94 container_of(entry, struct acpi_madt_generic_interrupt, header);
95
96 if (!(gicc->flags & ACPI_MADT_ENABLED))
97 return -ENODEV;
98
99 /* device_declaration means Device object in DSDT, in the
100 * GIC interrupt model, logical processors are required to
101 * have a Processor Device object in the DSDT, so we should
102 * check device_declaration here
103 */
104 if (device_declaration && (gicc->uid == acpi_id)) {
105 *mpidr = gicc->arm_mpidr;
106 return 0;
107 }
108
109 return -EINVAL;
110}
111
112static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
113 int type, u32 acpi_id)
114{
115 unsigned long madt_end, entry;
116 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
117
118 if (!madt)
119 return phys_id;
120
121 entry = (unsigned long)madt;
122 madt_end = entry + madt->header.length;
123
124 /* Parse all entries looking for a match. */
125
126 entry += sizeof(struct acpi_table_madt);
127 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
128 struct acpi_subtable_header *header =
129 (struct acpi_subtable_header *)entry;
130 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
131 if (!map_lapic_id(header, acpi_id, &phys_id))
132 break;
133 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
134 if (!map_x2apic_id(header, type, acpi_id, &phys_id))
135 break;
136 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
137 if (!map_lsapic_id(header, type, acpi_id, &phys_id))
138 break;
139 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
140 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))
141 break;
142 }
143 entry += header->length;
144 }
145 return phys_id;
146}
147
148phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
149{
150 struct acpi_table_madt *madt = NULL;
151 phys_cpuid_t rv;
152
153 acpi_get_table(ACPI_SIG_MADT, 0,
154 (struct acpi_table_header **)&madt);
155 if (!madt)
156 return PHYS_CPUID_INVALID;
157
158 rv = map_madt_entry(madt, 1, acpi_id);
159
160 acpi_put_table((struct acpi_table_header *)madt);
161
162 return rv;
163}
164
165static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
166{
167 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
168 union acpi_object *obj;
169 struct acpi_subtable_header *header;
170 phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
171
172 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
173 goto exit;
174
175 if (!buffer.length || !buffer.pointer)
176 goto exit;
177
178 obj = buffer.pointer;
179 if (obj->type != ACPI_TYPE_BUFFER ||
180 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
181 goto exit;
182 }
183
184 header = (struct acpi_subtable_header *)obj->buffer.pointer;
185 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
186 map_lapic_id(header, acpi_id, &phys_id);
187 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
188 map_lsapic_id(header, type, acpi_id, &phys_id);
189 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
190 map_x2apic_id(header, type, acpi_id, &phys_id);
191 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
192 map_gicc_mpidr(header, type, acpi_id, &phys_id);
193
194exit:
195 kfree(buffer.pointer);
196 return phys_id;
197}
198
199phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
200{
201 phys_cpuid_t phys_id;
202
203 phys_id = map_mat_entry(handle, type, acpi_id);
204 if (invalid_phys_cpuid(phys_id))
205 phys_id = map_madt_entry(get_madt_table(), type, acpi_id);
206
207 return phys_id;
208}
209EXPORT_SYMBOL_GPL(acpi_get_phys_id);
210
211int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
212{
213#ifdef CONFIG_SMP
214 int i;
215#endif
216
217 if (invalid_phys_cpuid(phys_id)) {
218 /*
219 * On UP processor, there is no _MAT or MADT table.
220 * So above phys_id is always set to PHYS_CPUID_INVALID.
221 *
222 * BIOS may define multiple CPU handles even for UP processor.
223 * For example,
224 *
225 * Scope (_PR)
226 * {
227 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
228 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
229 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
230 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
231 * }
232 *
233 * Ignores phys_id and always returns 0 for the processor
234 * handle with acpi id 0 if nr_cpu_ids is 1.
235 * This should be the case if SMP tables are not found.
236 * Return -EINVAL for other CPU's handle.
237 */
238 if (nr_cpu_ids <= 1 && acpi_id == 0)
239 return acpi_id;
240 else
241 return -EINVAL;
242 }
243
244#ifdef CONFIG_SMP
245 for_each_possible_cpu(i) {
246 if (cpu_physical_id(i) == phys_id)
247 return i;
248 }
249#else
250 /* In UP kernel, only processor 0 is valid */
251 if (phys_id == 0)
252 return phys_id;
253#endif
254 return -ENODEV;
255}
256
257int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
258{
259 phys_cpuid_t phys_id;
260
261 phys_id = acpi_get_phys_id(handle, type, acpi_id);
262
263 return acpi_map_cpuid(phys_id, acpi_id);
264}
265EXPORT_SYMBOL_GPL(acpi_get_cpuid);
266
267#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
268static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
269 u64 *phys_addr, int *ioapic_id)
270{
271 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
272
273 if (ioapic->global_irq_base != gsi_base)
274 return 0;
275
276 *phys_addr = ioapic->address;
277 *ioapic_id = ioapic->id;
278 return 1;
279}
280
281static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
282{
283 struct acpi_subtable_header *hdr;
284 unsigned long madt_end, entry;
285 struct acpi_table_madt *madt;
286 int apic_id = -1;
287
288 madt = get_madt_table();
289 if (!madt)
290 return apic_id;
291
292 entry = (unsigned long)madt;
293 madt_end = entry + madt->header.length;
294
295 /* Parse all entries looking for a match. */
296 entry += sizeof(struct acpi_table_madt);
297 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
298 hdr = (struct acpi_subtable_header *)entry;
299 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
300 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
301 break;
302 else
303 entry += hdr->length;
304 }
305
306 return apic_id;
307}
308
309static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
310 u64 *phys_addr)
311{
312 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
313 struct acpi_subtable_header *header;
314 union acpi_object *obj;
315 int apic_id = -1;
316
317 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
318 goto exit;
319
320 if (!buffer.length || !buffer.pointer)
321 goto exit;
322
323 obj = buffer.pointer;
324 if (obj->type != ACPI_TYPE_BUFFER ||
325 obj->buffer.length < sizeof(struct acpi_subtable_header))
326 goto exit;
327
328 header = (struct acpi_subtable_header *)obj->buffer.pointer;
329 if (header->type == ACPI_MADT_TYPE_IO_APIC)
330 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
331
332exit:
333 kfree(buffer.pointer);
334 return apic_id;
335}
336
337/**
338 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
339 * @handle: ACPI object for IOAPIC device
340 * @gsi_base: GSI base to match with
341 * @phys_addr: Pointer to store physical address of matching IOAPIC record
342 *
343 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
344 * for an ACPI IOAPIC record matching @gsi_base.
345 * Return IOAPIC id and store physical address in @phys_addr if found a match,
346 * otherwise return <0.
347 */
348int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
349{
350 int apic_id;
351
352 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
353 if (apic_id == -1)
354 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
355
356 return apic_id;
357}
358#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 *
8 * I/O APIC hotplug support
9 * Yinghai Lu <yinghai@kernel.org>
10 * Jiang Liu <jiang.liu@intel.com>
11 */
12#include <linux/export.h>
13#include <linux/acpi.h>
14#include <acpi/processor.h>
15
16#define _COMPONENT ACPI_PROCESSOR_COMPONENT
17ACPI_MODULE_NAME("processor_core");
18
19static struct acpi_table_madt *get_madt_table(void)
20{
21 static struct acpi_table_madt *madt;
22 static int read_madt;
23
24 if (!read_madt) {
25 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
26 (struct acpi_table_header **)&madt)))
27 madt = NULL;
28 read_madt++;
29 }
30
31 return madt;
32}
33
34static int map_lapic_id(struct acpi_subtable_header *entry,
35 u32 acpi_id, phys_cpuid_t *apic_id, bool ignore_disabled)
36{
37 struct acpi_madt_local_apic *lapic =
38 container_of(entry, struct acpi_madt_local_apic, header);
39
40 if (ignore_disabled && !(lapic->lapic_flags & ACPI_MADT_ENABLED))
41 return -ENODEV;
42
43 if (lapic->processor_id != acpi_id)
44 return -EINVAL;
45
46 *apic_id = lapic->id;
47 return 0;
48}
49
50static int map_x2apic_id(struct acpi_subtable_header *entry,
51 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id,
52 bool ignore_disabled)
53{
54 struct acpi_madt_local_x2apic *apic =
55 container_of(entry, struct acpi_madt_local_x2apic, header);
56
57 if (ignore_disabled && !(apic->lapic_flags & ACPI_MADT_ENABLED))
58 return -ENODEV;
59
60 if (device_declaration && (apic->uid == acpi_id)) {
61 *apic_id = apic->local_apic_id;
62 return 0;
63 }
64
65 return -EINVAL;
66}
67
68static int map_lsapic_id(struct acpi_subtable_header *entry,
69 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id,
70 bool ignore_disabled)
71{
72 struct acpi_madt_local_sapic *lsapic =
73 container_of(entry, struct acpi_madt_local_sapic, header);
74
75 if (ignore_disabled && !(lsapic->lapic_flags & ACPI_MADT_ENABLED))
76 return -ENODEV;
77
78 if (device_declaration) {
79 if ((entry->length < 16) || (lsapic->uid != acpi_id))
80 return -EINVAL;
81 } else if (lsapic->processor_id != acpi_id)
82 return -EINVAL;
83
84 *apic_id = (lsapic->id << 8) | lsapic->eid;
85 return 0;
86}
87
88/*
89 * Retrieve the ARM CPU physical identifier (MPIDR)
90 */
91static int map_gicc_mpidr(struct acpi_subtable_header *entry,
92 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr,
93 bool ignore_disabled)
94{
95 struct acpi_madt_generic_interrupt *gicc =
96 container_of(entry, struct acpi_madt_generic_interrupt, header);
97
98 if (ignore_disabled && !(gicc->flags & ACPI_MADT_ENABLED))
99 return -ENODEV;
100
101 /* device_declaration means Device object in DSDT, in the
102 * GIC interrupt model, logical processors are required to
103 * have a Processor Device object in the DSDT, so we should
104 * check device_declaration here
105 */
106 if (device_declaration && (gicc->uid == acpi_id)) {
107 *mpidr = gicc->arm_mpidr;
108 return 0;
109 }
110
111 return -EINVAL;
112}
113
114static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
115 int type, u32 acpi_id, bool ignore_disabled)
116{
117 unsigned long madt_end, entry;
118 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
119
120 if (!madt)
121 return phys_id;
122
123 entry = (unsigned long)madt;
124 madt_end = entry + madt->header.length;
125
126 /* Parse all entries looking for a match. */
127
128 entry += sizeof(struct acpi_table_madt);
129 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
130 struct acpi_subtable_header *header =
131 (struct acpi_subtable_header *)entry;
132 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
133 if (!map_lapic_id(header, acpi_id, &phys_id,
134 ignore_disabled))
135 break;
136 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
137 if (!map_x2apic_id(header, type, acpi_id, &phys_id,
138 ignore_disabled))
139 break;
140 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
141 if (!map_lsapic_id(header, type, acpi_id, &phys_id,
142 ignore_disabled))
143 break;
144 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
145 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id,
146 ignore_disabled))
147 break;
148 }
149 entry += header->length;
150 }
151 return phys_id;
152}
153
154phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
155{
156 struct acpi_table_madt *madt = NULL;
157 phys_cpuid_t rv;
158
159 acpi_get_table(ACPI_SIG_MADT, 0,
160 (struct acpi_table_header **)&madt);
161 if (!madt)
162 return PHYS_CPUID_INVALID;
163
164 rv = map_madt_entry(madt, 1, acpi_id, true);
165
166 acpi_put_table((struct acpi_table_header *)madt);
167
168 return rv;
169}
170
171static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id,
172 bool ignore_disabled)
173{
174 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
175 union acpi_object *obj;
176 struct acpi_subtable_header *header;
177 phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
178
179 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
180 goto exit;
181
182 if (!buffer.length || !buffer.pointer)
183 goto exit;
184
185 obj = buffer.pointer;
186 if (obj->type != ACPI_TYPE_BUFFER ||
187 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
188 goto exit;
189 }
190
191 header = (struct acpi_subtable_header *)obj->buffer.pointer;
192 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
193 map_lapic_id(header, acpi_id, &phys_id, ignore_disabled);
194 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
195 map_lsapic_id(header, type, acpi_id, &phys_id, ignore_disabled);
196 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
197 map_x2apic_id(header, type, acpi_id, &phys_id, ignore_disabled);
198 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
199 map_gicc_mpidr(header, type, acpi_id, &phys_id,
200 ignore_disabled);
201
202exit:
203 kfree(buffer.pointer);
204 return phys_id;
205}
206
207static phys_cpuid_t __acpi_get_phys_id(acpi_handle handle, int type,
208 u32 acpi_id, bool ignore_disabled)
209{
210 phys_cpuid_t phys_id;
211
212 phys_id = map_mat_entry(handle, type, acpi_id, ignore_disabled);
213 if (invalid_phys_cpuid(phys_id))
214 phys_id = map_madt_entry(get_madt_table(), type, acpi_id,
215 ignore_disabled);
216
217 return phys_id;
218}
219
220phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
221{
222 return __acpi_get_phys_id(handle, type, acpi_id, true);
223}
224
225int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
226{
227#ifdef CONFIG_SMP
228 int i;
229#endif
230
231 if (invalid_phys_cpuid(phys_id)) {
232 /*
233 * On UP processor, there is no _MAT or MADT table.
234 * So above phys_id is always set to PHYS_CPUID_INVALID.
235 *
236 * BIOS may define multiple CPU handles even for UP processor.
237 * For example,
238 *
239 * Scope (_PR)
240 * {
241 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
242 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
243 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
244 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
245 * }
246 *
247 * Ignores phys_id and always returns 0 for the processor
248 * handle with acpi id 0 if nr_cpu_ids is 1.
249 * This should be the case if SMP tables are not found.
250 * Return -EINVAL for other CPU's handle.
251 */
252 if (nr_cpu_ids <= 1 && acpi_id == 0)
253 return acpi_id;
254 else
255 return -EINVAL;
256 }
257
258#ifdef CONFIG_SMP
259 for_each_possible_cpu(i) {
260 if (cpu_physical_id(i) == phys_id)
261 return i;
262 }
263#else
264 /* In UP kernel, only processor 0 is valid */
265 if (phys_id == 0)
266 return phys_id;
267#endif
268 return -ENODEV;
269}
270
271int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
272{
273 phys_cpuid_t phys_id;
274
275 phys_id = acpi_get_phys_id(handle, type, acpi_id);
276
277 return acpi_map_cpuid(phys_id, acpi_id);
278}
279EXPORT_SYMBOL_GPL(acpi_get_cpuid);
280
281#ifdef CONFIG_ACPI_HOTPLUG_CPU
282static bool __init
283map_processor(acpi_handle handle, phys_cpuid_t *phys_id, int *cpuid)
284{
285 int type, id;
286 u32 acpi_id;
287 acpi_status status;
288 acpi_object_type acpi_type;
289 unsigned long long tmp;
290 union acpi_object object = { 0 };
291 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
292
293 status = acpi_get_type(handle, &acpi_type);
294 if (ACPI_FAILURE(status))
295 return false;
296
297 switch (acpi_type) {
298 case ACPI_TYPE_PROCESSOR:
299 status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
300 if (ACPI_FAILURE(status))
301 return false;
302 acpi_id = object.processor.proc_id;
303
304 /* validate the acpi_id */
305 if(acpi_processor_validate_proc_id(acpi_id))
306 return false;
307 break;
308 case ACPI_TYPE_DEVICE:
309 status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
310 if (ACPI_FAILURE(status))
311 return false;
312 acpi_id = tmp;
313 break;
314 default:
315 return false;
316 }
317
318 type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
319
320 *phys_id = __acpi_get_phys_id(handle, type, acpi_id, false);
321 id = acpi_map_cpuid(*phys_id, acpi_id);
322
323 if (id < 0)
324 return false;
325 *cpuid = id;
326 return true;
327}
328
329static acpi_status __init
330set_processor_node_mapping(acpi_handle handle, u32 lvl, void *context,
331 void **rv)
332{
333 phys_cpuid_t phys_id;
334 int cpu_id;
335
336 if (!map_processor(handle, &phys_id, &cpu_id))
337 return AE_ERROR;
338
339 acpi_map_cpu2node(handle, cpu_id, phys_id);
340 return AE_OK;
341}
342
343void __init acpi_set_processor_mapping(void)
344{
345 /* Set persistent cpu <-> node mapping for all processors. */
346 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
347 ACPI_UINT32_MAX, set_processor_node_mapping,
348 NULL, NULL, NULL);
349}
350#else
351void __init acpi_set_processor_mapping(void) {}
352#endif /* CONFIG_ACPI_HOTPLUG_CPU */
353
354#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
355static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
356 u64 *phys_addr, int *ioapic_id)
357{
358 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
359
360 if (ioapic->global_irq_base != gsi_base)
361 return 0;
362
363 *phys_addr = ioapic->address;
364 *ioapic_id = ioapic->id;
365 return 1;
366}
367
368static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
369{
370 struct acpi_subtable_header *hdr;
371 unsigned long madt_end, entry;
372 struct acpi_table_madt *madt;
373 int apic_id = -1;
374
375 madt = get_madt_table();
376 if (!madt)
377 return apic_id;
378
379 entry = (unsigned long)madt;
380 madt_end = entry + madt->header.length;
381
382 /* Parse all entries looking for a match. */
383 entry += sizeof(struct acpi_table_madt);
384 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
385 hdr = (struct acpi_subtable_header *)entry;
386 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
387 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
388 break;
389 else
390 entry += hdr->length;
391 }
392
393 return apic_id;
394}
395
396static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
397 u64 *phys_addr)
398{
399 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
400 struct acpi_subtable_header *header;
401 union acpi_object *obj;
402 int apic_id = -1;
403
404 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
405 goto exit;
406
407 if (!buffer.length || !buffer.pointer)
408 goto exit;
409
410 obj = buffer.pointer;
411 if (obj->type != ACPI_TYPE_BUFFER ||
412 obj->buffer.length < sizeof(struct acpi_subtable_header))
413 goto exit;
414
415 header = (struct acpi_subtable_header *)obj->buffer.pointer;
416 if (header->type == ACPI_MADT_TYPE_IO_APIC)
417 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
418
419exit:
420 kfree(buffer.pointer);
421 return apic_id;
422}
423
424/**
425 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
426 * @handle: ACPI object for IOAPIC device
427 * @gsi_base: GSI base to match with
428 * @phys_addr: Pointer to store physical address of matching IOAPIC record
429 *
430 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
431 * for an ACPI IOAPIC record matching @gsi_base.
432 * Return IOAPIC id and store physical address in @phys_addr if found a match,
433 * otherwise return <0.
434 */
435int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
436{
437 int apic_id;
438
439 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
440 if (apic_id == -1)
441 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
442
443 return apic_id;
444}
445#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */