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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 */
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 */