Linux 4.1.16
[linux/fpc-iii.git] / drivers / acpi / processor_core.c
blobb1ec78b8a6455c68f08af8123a529e5513475b03
1 /*
2 * Copyright (C) 2005 Intel Corporation
3 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
5 * Alex Chiang <achiang@hp.com>
6 * - Unified x86/ia64 implementations
8 * I/O APIC hotplug support
9 * Yinghai Lu <yinghai@kernel.org>
10 * Jiang Liu <jiang.liu@intel.com>
12 #include <linux/export.h>
13 #include <linux/acpi.h>
14 #include <acpi/processor.h>
16 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
17 ACPI_MODULE_NAME("processor_core");
19 static struct acpi_table_madt *get_madt_table(void)
21 static struct acpi_table_madt *madt;
22 static int read_madt;
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++;
31 return madt;
34 static int map_lapic_id(struct acpi_subtable_header *entry,
35 u32 acpi_id, phys_cpuid_t *apic_id)
37 struct acpi_madt_local_apic *lapic =
38 container_of(entry, struct acpi_madt_local_apic, header);
40 if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
41 return -ENODEV;
43 if (lapic->processor_id != acpi_id)
44 return -EINVAL;
46 *apic_id = lapic->id;
47 return 0;
50 static int map_x2apic_id(struct acpi_subtable_header *entry,
51 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
53 struct acpi_madt_local_x2apic *apic =
54 container_of(entry, struct acpi_madt_local_x2apic, header);
56 if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
57 return -ENODEV;
59 if (device_declaration && (apic->uid == acpi_id)) {
60 *apic_id = apic->local_apic_id;
61 return 0;
64 return -EINVAL;
67 static int map_lsapic_id(struct acpi_subtable_header *entry,
68 int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
70 struct acpi_madt_local_sapic *lsapic =
71 container_of(entry, struct acpi_madt_local_sapic, header);
73 if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
74 return -ENODEV;
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;
82 *apic_id = (lsapic->id << 8) | lsapic->eid;
83 return 0;
87 * Retrieve the ARM CPU physical identifier (MPIDR)
89 static int map_gicc_mpidr(struct acpi_subtable_header *entry,
90 int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr)
92 struct acpi_madt_generic_interrupt *gicc =
93 container_of(entry, struct acpi_madt_generic_interrupt, header);
95 if (!(gicc->flags & ACPI_MADT_ENABLED))
96 return -ENODEV;
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
103 if (device_declaration && (gicc->uid == acpi_id)) {
104 *mpidr = gicc->arm_mpidr;
105 return 0;
108 return -EINVAL;
111 static phys_cpuid_t map_madt_entry(int type, u32 acpi_id)
113 unsigned long madt_end, entry;
114 phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
115 struct acpi_table_madt *madt;
117 madt = get_madt_table();
118 if (!madt)
119 return phys_id;
121 entry = (unsigned long)madt;
122 madt_end = entry + madt->header.length;
124 /* Parse all entries looking for a match. */
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;
143 entry += header->length;
145 return phys_id;
148 static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
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;
155 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
156 goto exit;
158 if (!buffer.length || !buffer.pointer)
159 goto exit;
161 obj = buffer.pointer;
162 if (obj->type != ACPI_TYPE_BUFFER ||
163 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
164 goto exit;
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);
177 exit:
178 kfree(buffer.pointer);
179 return phys_id;
182 phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
184 phys_cpuid_t phys_id;
186 phys_id = map_mat_entry(handle, type, acpi_id);
187 if (phys_id == PHYS_CPUID_INVALID)
188 phys_id = map_madt_entry(type, acpi_id);
190 return phys_id;
193 int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
195 #ifdef CONFIG_SMP
196 int i;
197 #endif
199 if (phys_id == PHYS_CPUID_INVALID) {
201 * On UP processor, there is no _MAT or MADT table.
202 * So above phys_id is always set to PHYS_CPUID_INVALID.
204 * BIOS may define multiple CPU handles even for UP processor.
205 * For example,
207 * Scope (_PR)
209 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
210 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
211 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
212 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
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 -1 for other CPU's handle.
220 if (nr_cpu_ids <= 1 && acpi_id == 0)
221 return acpi_id;
222 else
223 return -1;
226 #ifdef CONFIG_SMP
227 for_each_possible_cpu(i) {
228 if (cpu_physical_id(i) == phys_id)
229 return i;
231 #else
232 /* In UP kernel, only processor 0 is valid */
233 if (phys_id == 0)
234 return phys_id;
235 #endif
236 return -1;
239 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
241 phys_cpuid_t phys_id;
243 phys_id = acpi_get_phys_id(handle, type, acpi_id);
245 return acpi_map_cpuid(phys_id, acpi_id);
247 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
249 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
250 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
251 u64 *phys_addr, int *ioapic_id)
253 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
255 if (ioapic->global_irq_base != gsi_base)
256 return 0;
258 *phys_addr = ioapic->address;
259 *ioapic_id = ioapic->id;
260 return 1;
263 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
265 struct acpi_subtable_header *hdr;
266 unsigned long madt_end, entry;
267 struct acpi_table_madt *madt;
268 int apic_id = -1;
270 madt = get_madt_table();
271 if (!madt)
272 return apic_id;
274 entry = (unsigned long)madt;
275 madt_end = entry + madt->header.length;
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;
288 return apic_id;
291 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
292 u64 *phys_addr)
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;
299 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
300 goto exit;
302 if (!buffer.length || !buffer.pointer)
303 goto exit;
305 obj = buffer.pointer;
306 if (obj->type != ACPI_TYPE_BUFFER ||
307 obj->buffer.length < sizeof(struct acpi_subtable_header))
308 goto exit;
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);
314 exit:
315 kfree(buffer.pointer);
316 return apic_id;
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
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.
330 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
332 int apic_id;
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);
338 return apic_id;
340 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */