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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// 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 & ACPI_MADT_ENABLED))
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
109static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
110 int type, u32 acpi_id)
111{
112 unsigned long madt_end, entry;
113 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
114
115 if (!madt)
116 return phys_id;
117
118 entry = (unsigned long)madt;
119 madt_end = entry + madt->header.length;
120
121 /* Parse all entries looking for a match. */
122
123 entry += sizeof(struct acpi_table_madt);
124 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
125 struct acpi_subtable_header *header =
126 (struct acpi_subtable_header *)entry;
127 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
128 if (!map_lapic_id(header, acpi_id, &phys_id))
129 break;
130 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
131 if (!map_x2apic_id(header, type, acpi_id, &phys_id))
132 break;
133 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
134 if (!map_lsapic_id(header, type, acpi_id, &phys_id))
135 break;
136 } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
137 if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))
138 break;
139 }
140 entry += header->length;
141 }
142 return phys_id;
143}
144
145phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
146{
147 struct acpi_table_madt *madt = NULL;
148 phys_cpuid_t rv;
149
150 acpi_get_table(ACPI_SIG_MADT, 0,
151 (struct acpi_table_header **)&madt);
152 if (!madt)
153 return PHYS_CPUID_INVALID;
154
155 rv = map_madt_entry(madt, 1, acpi_id);
156
157 acpi_put_table((struct acpi_table_header *)madt);
158
159 return rv;
160}
161
162static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
163{
164 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
165 union acpi_object *obj;
166 struct acpi_subtable_header *header;
167 phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
168
169 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
170 goto exit;
171
172 if (!buffer.length || !buffer.pointer)
173 goto exit;
174
175 obj = buffer.pointer;
176 if (obj->type != ACPI_TYPE_BUFFER ||
177 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
178 goto exit;
179 }
180
181 header = (struct acpi_subtable_header *)obj->buffer.pointer;
182 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
183 map_lapic_id(header, acpi_id, &phys_id);
184 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
185 map_lsapic_id(header, type, acpi_id, &phys_id);
186 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
187 map_x2apic_id(header, type, acpi_id, &phys_id);
188 else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
189 map_gicc_mpidr(header, type, acpi_id, &phys_id);
190
191exit:
192 kfree(buffer.pointer);
193 return phys_id;
194}
195
196phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
197{
198 phys_cpuid_t phys_id;
199
200 phys_id = map_mat_entry(handle, type, acpi_id);
201 if (invalid_phys_cpuid(phys_id))
202 phys_id = map_madt_entry(get_madt_table(), type, acpi_id);
203
204 return phys_id;
205}
206EXPORT_SYMBOL_GPL(acpi_get_phys_id);
207
208int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
209{
210#ifdef CONFIG_SMP
211 int i;
212#endif
213
214 if (invalid_phys_cpuid(phys_id)) {
215 /*
216 * On UP processor, there is no _MAT or MADT table.
217 * So above phys_id is always set to PHYS_CPUID_INVALID.
218 *
219 * BIOS may define multiple CPU handles even for UP processor.
220 * For example,
221 *
222 * Scope (_PR)
223 * {
224 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
225 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
226 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
227 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
228 * }
229 *
230 * Ignores phys_id and always returns 0 for the processor
231 * handle with acpi id 0 if nr_cpu_ids is 1.
232 * This should be the case if SMP tables are not found.
233 * Return -EINVAL for other CPU's handle.
234 */
235 if (nr_cpu_ids <= 1 && acpi_id == 0)
236 return acpi_id;
237 else
238 return -EINVAL;
239 }
240
241#ifdef CONFIG_SMP
242 for_each_possible_cpu(i) {
243 if (cpu_physical_id(i) == phys_id)
244 return i;
245 }
246#else
247 /* In UP kernel, only processor 0 is valid */
248 if (phys_id == 0)
249 return phys_id;
250#endif
251 return -ENODEV;
252}
253
254int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
255{
256 phys_cpuid_t phys_id;
257
258 phys_id = acpi_get_phys_id(handle, type, acpi_id);
259
260 return acpi_map_cpuid(phys_id, acpi_id);
261}
262EXPORT_SYMBOL_GPL(acpi_get_cpuid);
263
264#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
265static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
266 u64 *phys_addr, int *ioapic_id)
267{
268 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
269
270 if (ioapic->global_irq_base != gsi_base)
271 return 0;
272
273 *phys_addr = ioapic->address;
274 *ioapic_id = ioapic->id;
275 return 1;
276}
277
278static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
279{
280 struct acpi_subtable_header *hdr;
281 unsigned long madt_end, entry;
282 struct acpi_table_madt *madt;
283 int apic_id = -1;
284
285 madt = get_madt_table();
286 if (!madt)
287 return apic_id;
288
289 entry = (unsigned long)madt;
290 madt_end = entry + madt->header.length;
291
292 /* Parse all entries looking for a match. */
293 entry += sizeof(struct acpi_table_madt);
294 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
295 hdr = (struct acpi_subtable_header *)entry;
296 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
297 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
298 break;
299 else
300 entry += hdr->length;
301 }
302
303 return apic_id;
304}
305
306static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
307 u64 *phys_addr)
308{
309 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
310 struct acpi_subtable_header *header;
311 union acpi_object *obj;
312 int apic_id = -1;
313
314 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
315 goto exit;
316
317 if (!buffer.length || !buffer.pointer)
318 goto exit;
319
320 obj = buffer.pointer;
321 if (obj->type != ACPI_TYPE_BUFFER ||
322 obj->buffer.length < sizeof(struct acpi_subtable_header))
323 goto exit;
324
325 header = (struct acpi_subtable_header *)obj->buffer.pointer;
326 if (header->type == ACPI_MADT_TYPE_IO_APIC)
327 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
328
329exit:
330 kfree(buffer.pointer);
331 return apic_id;
332}
333
334/**
335 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
336 * @handle: ACPI object for IOAPIC device
337 * @gsi_base: GSI base to match with
338 * @phys_addr: Pointer to store physical address of matching IOAPIC record
339 *
340 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
341 * for an ACPI IOAPIC record matching @gsi_base.
342 * Return IOAPIC id and store physical address in @phys_addr if found a match,
343 * otherwise return <0.
344 */
345int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
346{
347 int apic_id;
348
349 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
350 if (apic_id == -1)
351 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
352
353 return apic_id;
354}
355#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */