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;
25 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
26 (struct acpi_table_header **)&madt)))
34 static int map_lapic_id(struct acpi_subtable_header *entry,
35 u32 acpi_id, int *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))
43 if (lapic->processor_id != acpi_id)
50 static int map_x2apic_id(struct acpi_subtable_header *entry,
51 int device_declaration, u32 acpi_id, int *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))
59 if (device_declaration && (apic->uid == acpi_id)) {
60 *apic_id = apic->local_apic_id;
67 static int map_lsapic_id(struct acpi_subtable_header *entry,
68 int device_declaration, u32 acpi_id, int *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))
76 if (device_declaration) {
77 if ((entry->length < 16) || (lsapic->uid != acpi_id))
79 } else if (lsapic->processor_id != acpi_id)
82 *apic_id = (lsapic->id << 8) | lsapic->eid;
86 static int map_madt_entry(int type, u32 acpi_id)
88 unsigned long madt_end, entry;
89 int phys_id = -1; /* CPU hardware ID */
90 struct acpi_table_madt *madt;
92 madt = get_madt_table();
96 entry = (unsigned long)madt;
97 madt_end = entry + madt->header.length;
99 /* Parse all entries looking for a match. */
101 entry += sizeof(struct acpi_table_madt);
102 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
103 struct acpi_subtable_header *header =
104 (struct acpi_subtable_header *)entry;
105 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
106 if (!map_lapic_id(header, acpi_id, &phys_id))
108 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
109 if (!map_x2apic_id(header, type, acpi_id, &phys_id))
111 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
112 if (!map_lsapic_id(header, type, acpi_id, &phys_id))
115 entry += header->length;
120 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
122 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
123 union acpi_object *obj;
124 struct acpi_subtable_header *header;
127 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
130 if (!buffer.length || !buffer.pointer)
133 obj = buffer.pointer;
134 if (obj->type != ACPI_TYPE_BUFFER ||
135 obj->buffer.length < sizeof(struct acpi_subtable_header)) {
139 header = (struct acpi_subtable_header *)obj->buffer.pointer;
140 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
141 map_lapic_id(header, acpi_id, &phys_id);
142 else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
143 map_lsapic_id(header, type, acpi_id, &phys_id);
144 else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
145 map_x2apic_id(header, type, acpi_id, &phys_id);
148 kfree(buffer.pointer);
152 int acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
156 phys_id = map_mat_entry(handle, type, acpi_id);
158 phys_id = map_madt_entry(type, acpi_id);
163 int acpi_map_cpuid(int phys_id, u32 acpi_id)
171 * On UP processor, there is no _MAT or MADT table.
172 * So above phys_id is always set to -1.
174 * BIOS may define multiple CPU handles even for UP processor.
179 * Processor (CPU0, 0x00, 0x00000410, 0x06) {}
180 * Processor (CPU1, 0x01, 0x00000410, 0x06) {}
181 * Processor (CPU2, 0x02, 0x00000410, 0x06) {}
182 * Processor (CPU3, 0x03, 0x00000410, 0x06) {}
185 * Ignores phys_id and always returns 0 for the processor
186 * handle with acpi id 0 if nr_cpu_ids is 1.
187 * This should be the case if SMP tables are not found.
188 * Return -1 for other CPU's handle.
190 if (nr_cpu_ids <= 1 && acpi_id == 0)
197 for_each_possible_cpu(i) {
198 if (cpu_physical_id(i) == phys_id)
202 /* In UP kernel, only processor 0 is valid */
209 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
213 phys_id = acpi_get_phys_id(handle, type, acpi_id);
215 return acpi_map_cpuid(phys_id, acpi_id);
217 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
219 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
220 static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
221 u64 *phys_addr, int *ioapic_id)
223 struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
225 if (ioapic->global_irq_base != gsi_base)
228 *phys_addr = ioapic->address;
229 *ioapic_id = ioapic->id;
233 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
235 struct acpi_subtable_header *hdr;
236 unsigned long madt_end, entry;
237 struct acpi_table_madt *madt;
240 madt = get_madt_table();
244 entry = (unsigned long)madt;
245 madt_end = entry + madt->header.length;
247 /* Parse all entries looking for a match. */
248 entry += sizeof(struct acpi_table_madt);
249 while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
250 hdr = (struct acpi_subtable_header *)entry;
251 if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
252 get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
255 entry += hdr->length;
261 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
264 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
265 struct acpi_subtable_header *header;
266 union acpi_object *obj;
269 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
272 if (!buffer.length || !buffer.pointer)
275 obj = buffer.pointer;
276 if (obj->type != ACPI_TYPE_BUFFER ||
277 obj->buffer.length < sizeof(struct acpi_subtable_header))
280 header = (struct acpi_subtable_header *)obj->buffer.pointer;
281 if (header->type == ACPI_MADT_TYPE_IO_APIC)
282 get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
285 kfree(buffer.pointer);
290 * acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @gsi_base
291 * @handle: ACPI object for IOAPIC device
292 * @gsi_base: GSI base to match with
293 * @phys_addr: Pointer to store physical address of matching IOAPIC record
295 * Walk resources returned by ACPI_MAT method, then ACPI MADT table, to search
296 * for an ACPI IOAPIC record matching @gsi_base.
297 * Return IOAPIC id and store physical address in @phys_addr if found a match,
298 * otherwise return <0.
300 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
304 apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
306 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
310 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */