Loading...
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)
36{
37 struct acpi_madt_local_apic *lapic =
38 container_of(entry, struct acpi_madt_local_apic, header);
39
40 if (!(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{
53 struct acpi_madt_local_x2apic *apic =
54 container_of(entry, struct acpi_madt_local_x2apic, header);
55
56 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
57 return -ENODEV;
58
59 if (device_declaration && (apic->uid == acpi_id)) {
60 *apic_id = apic->local_apic_id;
61 return 0;
62 }
63
64 return -EINVAL;
65}
66
67static int map_lsapic_id(struct acpi_subtable_header *entry,
68 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
69{
70 struct acpi_madt_local_sapic *lsapic =
71 container_of(entry, struct acpi_madt_local_sapic, header);
72
73 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
74 return -ENODEV;
75
76 if (device_declaration) {
77 if ((entry->length < 16) || (lsapic->uid != acpi_id))
78 return -EINVAL;
79 } else if (lsapic->processor_id != acpi_id)
80 return -EINVAL;
81
82 *apic_id = (lsapic->id << 8) | lsapic->eid;
83 return 0;
84}
85
86/*
87 * Retrieve the ARM CPU physical identifier (MPIDR)
88 */
89static int map_gicc_mpidr(struct acpi_subtable_header *entry,
90 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr)
91{
92 struct acpi_madt_generic_interrupt *gicc =
93 container_of(entry, struct acpi_madt_generic_interrupt, header);
94
95 if (!(gicc->flags & ACPI_MADT_ENABLED))
96 return -ENODEV;
97
98 /* device_declaration means Device object in DSDT, in the
99 * GIC interrupt model, logical processors are required to
100 * have a Processor Device object in the DSDT, so we should
101 * check device_declaration here
102 */
103 if (device_declaration && (gicc->uid == acpi_id)) {
104 *mpidr = gicc->arm_mpidr;
105 return 0;
106 }
107
108 return -EINVAL;
109}
110
111static phys_cpuid_t map_madt_entry(int type, u32 acpi_id)
112{
113 unsigned long madt_end, entry;
114 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
115 struct acpi_table_madt *madt;
116
117 madt = get_madt_table();
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
148static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
149{
150 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
151 union acpi_object *obj;
152 struct acpi_subtable_header *header;
153 phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
154
155 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
156 goto exit;
157
158 if (!buffer.length || !buffer.pointer)
159 goto exit;
160
161 obj = buffer.pointer;
162 if (obj->type != ACPI_TYPE_BUFFER ||
163 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
164 goto exit;
165 }
166
167 header = (struct acpi_subtable_header *)obj->buffer.pointer;
168 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
169 map_lapic_id(header, acpi_id, &phys_id);
170 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
171 map_lsapic_id(header, type, acpi_id, &phys_id);
172 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
173 map_x2apic_id(header, type, acpi_id, &phys_id);
174 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
175 map_gicc_mpidr(header, type, acpi_id, &phys_id);
176
177exit:
178 kfree(buffer.pointer);
179 return phys_id;
180}
181
182phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
183{
184 phys_cpuid_t phys_id;
185
186 phys_id = map_mat_entry(handle, type, acpi_id);
187 if (invalid_phys_cpuid(phys_id))
188 phys_id = map_madt_entry(type, acpi_id);
189
190 return phys_id;
191}
192
193int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
194{
195#ifdef CONFIG_SMP
196 int i;
197#endif
198
199 if (invalid_phys_cpuid(phys_id)) {
200 /*
201 * On UP processor, there is no _MAT or MADT table.
202 * So above phys_id is always set to PHYS_CPUID_INVALID.
203 *
204 * BIOS may define multiple CPU handles even for UP processor.
205 * For example,
206 *
207 * Scope (_PR)
208 * {
209 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
210 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
211 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
212 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
213 * }
214 *
215 * Ignores phys_id and always returns 0 for the processor
216 * handle with acpi id 0 if nr_cpu_ids is 1.
217 * This should be the case if SMP tables are not found.
218 * Return -EINVAL for other CPU's handle.
219 */
220 if (nr_cpu_ids <= 1 && acpi_id == 0)
221 return acpi_id;
222 else
223 return -EINVAL;
224 }
225
226#ifdef CONFIG_SMP
227 for_each_possible_cpu(i) {
228 if (cpu_physical_id(i) == phys_id)
229 return i;
230 }
231#else
232 /* In UP kernel, only processor 0 is valid */
233 if (phys_id == 0)
234 return phys_id;
235#endif
236 return -ENODEV;
237}
238
239int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
240{
241 phys_cpuid_t phys_id;
242
243 phys_id = acpi_get_phys_id(handle, type, acpi_id);
244
245 return acpi_map_cpuid(phys_id, acpi_id);
246}
247EXPORT_SYMBOL_GPL(acpi_get_cpuid);
248
249#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
250static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
251 u64 *phys_addr, int *ioapic_id)
252{
253 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
254
255 if (ioapic->global_irq_base != gsi_base)
256 return 0;
257
258 *phys_addr = ioapic->address;
259 *ioapic_id = ioapic->id;
260 return 1;
261}
262
263static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
264{
265 struct acpi_subtable_header *hdr;
266 unsigned long madt_end, entry;
267 struct acpi_table_madt *madt;
268 int apic_id = -1;
269
270 madt = get_madt_table();
271 if (!madt)
272 return apic_id;
273
274 entry = (unsigned long)madt;
275 madt_end = entry + madt->header.length;
276
277 /* Parse all entries looking for a match. */
278 entry += sizeof(struct acpi_table_madt);
279 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
280 hdr = (struct acpi_subtable_header *)entry;
281 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
282 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
283 break;
284 else
285 entry += hdr->length;
286 }
287
288 return apic_id;
289}
290
291static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
292 u64 *phys_addr)
293{
294 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
295 struct acpi_subtable_header *header;
296 union acpi_object *obj;
297 int apic_id = -1;
298
299 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
300 goto exit;
301
302 if (!buffer.length || !buffer.pointer)
303 goto exit;
304
305 obj = buffer.pointer;
306 if (obj->type != ACPI_TYPE_BUFFER ||
307 obj->buffer.length < sizeof(struct acpi_subtable_header))
308 goto exit;
309
310 header = (struct acpi_subtable_header *)obj->buffer.pointer;
311 if (header->type == ACPI_MADT_TYPE_IO_APIC)
312 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
313
314exit:
315 kfree(buffer.pointer);
316 return apic_id;
317}
318
319/**
320 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
321 * @handle: ACPI object for IOAPIC device
322 * @gsi_base: GSI base to match with
323 * @phys_addr: Pointer to store physical address of matching IOAPIC record
324 *
325 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
326 * for an ACPI IOAPIC record matching @gsi_base.
327 * Return IOAPIC id and store physical address in @phys_addr if found a match,
328 * otherwise return <0.
329 */
330int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
331{
332 int apic_id;
333
334 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
335 if (apic_id == -1)
336 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
337
338 return apic_id;
339}
340#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */