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 */