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