Commit | Line | Data |
---|---|---|
47817254 AC |
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 | |
ecf5636d YL |
7 | * |
8 | * I/O APIC hotplug support | |
9 | * Yinghai Lu <yinghai@kernel.org> | |
10 | * Jiang Liu <jiang.liu@intel.com> | |
47817254 | 11 | */ |
214f2c90 | 12 | #include <linux/export.h> |
8b48463f | 13 | #include <linux/acpi.h> |
78f16996 AC |
14 | #include <acpi/processor.h> |
15 | ||
78f16996 | 16 | #define _COMPONENT ACPI_PROCESSOR_COMPONENT |
4d5d4cd8 | 17 | ACPI_MODULE_NAME("processor_core"); |
78f16996 | 18 | |
ecf5636d YL |
19 | static 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 | ||
78ed8bd2 | 34 | static int map_lapic_id(struct acpi_subtable_header *entry, |
09c3f2bd | 35 | u32 acpi_id, phys_cpuid_t *apic_id) |
78ed8bd2 AC |
36 | { |
37 | struct acpi_madt_local_apic *lapic = | |
ef86c3f4 | 38 | container_of(entry, struct acpi_madt_local_apic, header); |
11130736 | 39 | |
09c3f2bd | 40 | if (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) |
038d7b59 | 41 | return -ENODEV; |
11130736 AC |
42 | |
43 | if (lapic->processor_id != acpi_id) | |
038d7b59 | 44 | return -EINVAL; |
11130736 AC |
45 | |
46 | *apic_id = lapic->id; | |
038d7b59 | 47 | return 0; |
78ed8bd2 AC |
48 | } |
49 | ||
50 | static int map_x2apic_id(struct acpi_subtable_header *entry, | |
09c3f2bd | 51 | int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) |
78ed8bd2 AC |
52 | { |
53 | struct acpi_madt_local_x2apic *apic = | |
ef86c3f4 | 54 | container_of(entry, struct acpi_madt_local_x2apic, header); |
78ed8bd2 | 55 | |
09c3f2bd | 56 | if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) |
038d7b59 | 57 | return -ENODEV; |
78ed8bd2 | 58 | |
d6742095 AC |
59 | if (device_declaration && (apic->uid == acpi_id)) { |
60 | *apic_id = apic->local_apic_id; | |
038d7b59 | 61 | return 0; |
78ed8bd2 AC |
62 | } |
63 | ||
038d7b59 | 64 | return -EINVAL; |
78ed8bd2 AC |
65 | } |
66 | ||
67 | static int map_lsapic_id(struct acpi_subtable_header *entry, | |
09c3f2bd | 68 | int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id) |
78ed8bd2 AC |
69 | { |
70 | struct acpi_madt_local_sapic *lsapic = | |
ef86c3f4 | 71 | container_of(entry, struct acpi_madt_local_sapic, header); |
78ed8bd2 | 72 | |
09c3f2bd | 73 | if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) |
038d7b59 | 74 | return -ENODEV; |
78ed8bd2 | 75 | |
78ed8bd2 | 76 | if (device_declaration) { |
eae701ce | 77 | if ((entry->length < 16) || (lsapic->uid != acpi_id)) |
038d7b59 | 78 | return -EINVAL; |
eae701ce | 79 | } else if (lsapic->processor_id != acpi_id) |
038d7b59 | 80 | return -EINVAL; |
78ed8bd2 | 81 | |
eae701ce | 82 | *apic_id = (lsapic->id << 8) | lsapic->eid; |
038d7b59 | 83 | return 0; |
78ed8bd2 AC |
84 | } |
85 | ||
020295b4 HG |
86 | /* |
87 | * Retrieve the ARM CPU physical identifier (MPIDR) | |
88 | */ | |
89 | static int map_gicc_mpidr(struct acpi_subtable_header *entry, | |
09c3f2bd | 90 | int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr) |
020295b4 HG |
91 | { |
92 | struct acpi_madt_generic_interrupt *gicc = | |
93 | container_of(entry, struct acpi_madt_generic_interrupt, header); | |
94 | ||
09c3f2bd | 95 | if (!(gicc->flags & ACPI_MADT_ENABLED)) |
020295b4 HG |
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 | ||
fb7c2bae | 111 | static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, |
09c3f2bd | 112 | int type, u32 acpi_id) |
78ed8bd2 AC |
113 | { |
114 | unsigned long madt_end, entry; | |
828aef37 | 115 | phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */ |
78ed8bd2 AC |
116 | |
117 | if (!madt) | |
af8f3f51 | 118 | return phys_id; |
78ed8bd2 AC |
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) { | |
09c3f2bd | 130 | if (!map_lapic_id(header, acpi_id, &phys_id)) |
78ed8bd2 AC |
131 | break; |
132 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { | |
09c3f2bd | 133 | if (!map_x2apic_id(header, type, acpi_id, &phys_id)) |
78ed8bd2 AC |
134 | break; |
135 | } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { | |
09c3f2bd | 136 | if (!map_lsapic_id(header, type, acpi_id, &phys_id)) |
78ed8bd2 | 137 | break; |
020295b4 | 138 | } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { |
09c3f2bd | 139 | if (!map_gicc_mpidr(header, type, acpi_id, &phys_id)) |
020295b4 | 140 | break; |
78ed8bd2 AC |
141 | } |
142 | entry += header->length; | |
143 | } | |
af8f3f51 | 144 | return phys_id; |
78ed8bd2 AC |
145 | } |
146 | ||
fb7c2bae DD |
147 | phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id) |
148 | { | |
149 | struct acpi_table_madt *madt = NULL; | |
fb7c2bae DD |
150 | phys_cpuid_t rv; |
151 | ||
6b11d1d6 LZ |
152 | acpi_get_table(ACPI_SIG_MADT, 0, |
153 | (struct acpi_table_header **)&madt); | |
fb7c2bae DD |
154 | if (!madt) |
155 | return PHYS_CPUID_INVALID; | |
156 | ||
09c3f2bd | 157 | rv = map_madt_entry(madt, 1, acpi_id); |
fb7c2bae | 158 | |
6b11d1d6 | 159 | acpi_put_table((struct acpi_table_header *)madt); |
fb7c2bae DD |
160 | |
161 | return rv; | |
162 | } | |
163 | ||
09c3f2bd | 164 | static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id) |
78ed8bd2 AC |
165 | { |
166 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
167 | union acpi_object *obj; | |
168 | struct acpi_subtable_header *header; | |
828aef37 | 169 | phys_cpuid_t phys_id = PHYS_CPUID_INVALID; |
78ed8bd2 AC |
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; | |
13ca62b2 | 184 | if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) |
09c3f2bd | 185 | map_lapic_id(header, acpi_id, &phys_id); |
13ca62b2 | 186 | else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) |
09c3f2bd | 187 | map_lsapic_id(header, type, acpi_id, &phys_id); |
13ca62b2 | 188 | else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) |
09c3f2bd | 189 | map_x2apic_id(header, type, acpi_id, &phys_id); |
020295b4 | 190 | else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) |
09c3f2bd | 191 | map_gicc_mpidr(header, type, acpi_id, &phys_id); |
78ed8bd2 AC |
192 | |
193 | exit: | |
5273a258 | 194 | kfree(buffer.pointer); |
af8f3f51 | 195 | return phys_id; |
78ed8bd2 AC |
196 | } |
197 | ||
09c3f2bd | 198 | phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id) |
78ed8bd2 | 199 | { |
828aef37 | 200 | phys_cpuid_t phys_id; |
78ed8bd2 | 201 | |
09c3f2bd | 202 | phys_id = map_mat_entry(handle, type, acpi_id); |
ddcc18f5 | 203 | if (invalid_phys_cpuid(phys_id)) |
09c3f2bd | 204 | phys_id = map_madt_entry(get_madt_table(), type, acpi_id); |
ca9f62ac | 205 | |
af8f3f51 | 206 | return phys_id; |
ca9f62ac | 207 | } |
166deb0f | 208 | EXPORT_SYMBOL_GPL(acpi_get_phys_id); |
ca9f62ac | 209 | |
828aef37 | 210 | int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id) |
ca9f62ac JL |
211 | { |
212 | #ifdef CONFIG_SMP | |
213 | int i; | |
214 | #endif | |
215 | ||
ddcc18f5 | 216 | if (invalid_phys_cpuid(phys_id)) { |
d640113f LM |
217 | /* |
218 | * On UP processor, there is no _MAT or MADT table. | |
828aef37 | 219 | * So above phys_id is always set to PHYS_CPUID_INVALID. |
d640113f LM |
220 | * |
221 | * BIOS may define multiple CPU handles even for UP processor. | |
222 | * For example, | |
223 | * | |
224 | * Scope (_PR) | |
13ca62b2 | 225 | * { |
d640113f LM |
226 | * Processor (CPU0, 0x00, 0x00000410, 0x06) {} |
227 | * Processor (CPU1, 0x01, 0x00000410, 0x06) {} | |
228 | * Processor (CPU2, 0x02, 0x00000410, 0x06) {} | |
229 | * Processor (CPU3, 0x03, 0x00000410, 0x06) {} | |
230 | * } | |
231 | * | |
af8f3f51 | 232 | * Ignores phys_id and always returns 0 for the processor |
c4686c71 TR |
233 | * handle with acpi id 0 if nr_cpu_ids is 1. |
234 | * This should be the case if SMP tables are not found. | |
d3da7cb9 | 235 | * Return -EINVAL for other CPU's handle. |
d640113f | 236 | */ |
c4686c71 | 237 | if (nr_cpu_ids <= 1 && acpi_id == 0) |
d640113f LM |
238 | return acpi_id; |
239 | else | |
d3da7cb9 | 240 | return -EINVAL; |
d640113f | 241 | } |
78ed8bd2 | 242 | |
932df741 | 243 | #ifdef CONFIG_SMP |
78ed8bd2 | 244 | for_each_possible_cpu(i) { |
af8f3f51 | 245 | if (cpu_physical_id(i) == phys_id) |
78ed8bd2 AC |
246 | return i; |
247 | } | |
932df741 LM |
248 | #else |
249 | /* In UP kernel, only processor 0 is valid */ | |
af8f3f51 HG |
250 | if (phys_id == 0) |
251 | return phys_id; | |
932df741 | 252 | #endif |
d3da7cb9 | 253 | return -ENODEV; |
78ed8bd2 | 254 | } |
ca9f62ac JL |
255 | |
256 | int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) | |
257 | { | |
828aef37 | 258 | phys_cpuid_t phys_id; |
ca9f62ac | 259 | |
af8f3f51 | 260 | phys_id = acpi_get_phys_id(handle, type, acpi_id); |
ca9f62ac | 261 | |
af8f3f51 | 262 | return acpi_map_cpuid(phys_id, acpi_id); |
ca9f62ac | 263 | } |
78ed8bd2 | 264 | EXPORT_SYMBOL_GPL(acpi_get_cpuid); |
ecf5636d YL |
265 | |
266 | #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC | |
267 | static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, | |
268 | u64 *phys_addr, int *ioapic_id) | |
269 | { | |
270 | struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; | |
271 | ||
272 | if (ioapic->global_irq_base != gsi_base) | |
273 | return 0; | |
274 | ||
275 | *phys_addr = ioapic->address; | |
276 | *ioapic_id = ioapic->id; | |
277 | return 1; | |
278 | } | |
279 | ||
280 | static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) | |
281 | { | |
282 | struct acpi_subtable_header *hdr; | |
283 | unsigned long madt_end, entry; | |
284 | struct acpi_table_madt *madt; | |
285 | int apic_id = -1; | |
286 | ||
287 | madt = get_madt_table(); | |
288 | if (!madt) | |
289 | return apic_id; | |
290 | ||
291 | entry = (unsigned long)madt; | |
292 | madt_end = entry + madt->header.length; | |
293 | ||
294 | /* Parse all entries looking for a match. */ | |
295 | entry += sizeof(struct acpi_table_madt); | |
296 | while (entry + sizeof(struct acpi_subtable_header) < madt_end) { | |
297 | hdr = (struct acpi_subtable_header *)entry; | |
298 | if (hdr->type == ACPI_MADT_TYPE_IO_APIC && | |
299 | get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) | |
300 | break; | |
301 | else | |
302 | entry += hdr->length; | |
303 | } | |
304 | ||
305 | return apic_id; | |
306 | } | |
307 | ||
308 | static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, | |
309 | u64 *phys_addr) | |
310 | { | |
311 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
312 | struct acpi_subtable_header *header; | |
313 | union acpi_object *obj; | |
314 | int apic_id = -1; | |
315 | ||
316 | if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) | |
317 | goto exit; | |
318 | ||
319 | if (!buffer.length || !buffer.pointer) | |
320 | goto exit; | |
321 | ||
322 | obj = buffer.pointer; | |
323 | if (obj->type != ACPI_TYPE_BUFFER || | |
324 | obj->buffer.length < sizeof(struct acpi_subtable_header)) | |
325 | goto exit; | |
326 | ||
327 | header = (struct acpi_subtable_header *)obj->buffer.pointer; | |
328 | if (header->type == ACPI_MADT_TYPE_IO_APIC) | |
329 | get_ioapic_id(header, gsi_base, phys_addr, &apic_id); | |
330 | ||
331 | exit: | |
332 | kfree(buffer.pointer); | |
333 | return apic_id; | |
334 | } | |
335 | ||
336 | /** | |
337 | * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base | |
338 | * @handle: ACPI object for IOAPIC device | |
339 | * @gsi_base: GSI base to match with | |
340 | * @phys_addr: Pointer to store physical address of matching IOAPIC record | |
341 | * | |
342 | * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search | |
343 | * for an ACPI IOAPIC record matching @gsi_base. | |
344 | * Return IOAPIC id and store physical address in @phys_addr if found a match, | |
345 | * otherwise return <0. | |
346 | */ | |
347 | int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr) | |
348 | { | |
349 | int apic_id; | |
350 | ||
351 | apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr); | |
352 | if (apic_id == -1) | |
353 | apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr); | |
354 | ||
355 | return apic_id; | |
356 | } | |
357 | #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */ |