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Linux/drivers/acpi/processor_core.c

  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 #include <linux/export.h>
  9 #include <linux/acpi.h>
 10 #include <acpi/processor.h>
 11 
 12 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
 13 ACPI_MODULE_NAME("processor_core");
 14 
 15 static int map_lapic_id(struct acpi_subtable_header *entry,
 16                  u32 acpi_id, int *apic_id)
 17 {
 18         struct acpi_madt_local_apic *lapic =
 19                 (struct acpi_madt_local_apic *)entry;
 20 
 21         if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
 22                 return -ENODEV;
 23 
 24         if (lapic->processor_id != acpi_id)
 25                 return -EINVAL;
 26 
 27         *apic_id = lapic->id;
 28         return 0;
 29 }
 30 
 31 static int map_x2apic_id(struct acpi_subtable_header *entry,
 32                          int device_declaration, u32 acpi_id, int *apic_id)
 33 {
 34         struct acpi_madt_local_x2apic *apic =
 35                 (struct acpi_madt_local_x2apic *)entry;
 36 
 37         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 38                 return -ENODEV;
 39 
 40         if (device_declaration && (apic->uid == acpi_id)) {
 41                 *apic_id = apic->local_apic_id;
 42                 return 0;
 43         }
 44 
 45         return -EINVAL;
 46 }
 47 
 48 static int map_lsapic_id(struct acpi_subtable_header *entry,
 49                 int device_declaration, u32 acpi_id, int *apic_id)
 50 {
 51         struct acpi_madt_local_sapic *lsapic =
 52                 (struct acpi_madt_local_sapic *)entry;
 53 
 54         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 55                 return -ENODEV;
 56 
 57         if (device_declaration) {
 58                 if ((entry->length < 16) || (lsapic->uid != acpi_id))
 59                         return -EINVAL;
 60         } else if (lsapic->processor_id != acpi_id)
 61                 return -EINVAL;
 62 
 63         *apic_id = (lsapic->id << 8) | lsapic->eid;
 64         return 0;
 65 }
 66 
 67 static int map_madt_entry(int type, u32 acpi_id)
 68 {
 69         unsigned long madt_end, entry;
 70         static struct acpi_table_madt *madt;
 71         static int read_madt;
 72         int apic_id = -1;
 73 
 74         if (!read_madt) {
 75                 if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
 76                                         (struct acpi_table_header **)&madt)))
 77                         madt = NULL;
 78                 read_madt++;
 79         }
 80 
 81         if (!madt)
 82                 return apic_id;
 83 
 84         entry = (unsigned long)madt;
 85         madt_end = entry + madt->header.length;
 86 
 87         /* Parse all entries looking for a match. */
 88 
 89         entry += sizeof(struct acpi_table_madt);
 90         while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
 91                 struct acpi_subtable_header *header =
 92                         (struct acpi_subtable_header *)entry;
 93                 if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
 94                         if (!map_lapic_id(header, acpi_id, &apic_id))
 95                                 break;
 96                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
 97                         if (!map_x2apic_id(header, type, acpi_id, &apic_id))
 98                                 break;
 99                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
100                         if (!map_lsapic_id(header, type, acpi_id, &apic_id))
101                                 break;
102                 }
103                 entry += header->length;
104         }
105         return apic_id;
106 }
107 
108 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
109 {
110         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
111         union acpi_object *obj;
112         struct acpi_subtable_header *header;
113         int apic_id = -1;
114 
115         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
116                 goto exit;
117 
118         if (!buffer.length || !buffer.pointer)
119                 goto exit;
120 
121         obj = buffer.pointer;
122         if (obj->type != ACPI_TYPE_BUFFER ||
123             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
124                 goto exit;
125         }
126 
127         header = (struct acpi_subtable_header *)obj->buffer.pointer;
128         if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
129                 map_lapic_id(header, acpi_id, &apic_id);
130         } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
131                 map_lsapic_id(header, type, acpi_id, &apic_id);
132         } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
133                 map_x2apic_id(header, type, acpi_id, &apic_id);
134         }
135 
136 exit:
137         kfree(buffer.pointer);
138         return apic_id;
139 }
140 
141 int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id)
142 {
143         int apic_id;
144 
145         apic_id = map_mat_entry(handle, type, acpi_id);
146         if (apic_id == -1)
147                 apic_id = map_madt_entry(type, acpi_id);
148 
149         return apic_id;
150 }
151 
152 int acpi_map_cpuid(int apic_id, u32 acpi_id)
153 {
154 #ifdef CONFIG_SMP
155         int i;
156 #endif
157 
158         if (apic_id == -1) {
159                 /*
160                  * On UP processor, there is no _MAT or MADT table.
161                  * So above apic_id is always set to -1.
162                  *
163                  * BIOS may define multiple CPU handles even for UP processor.
164                  * For example,
165                  *
166                  * Scope (_PR)
167                  * {
168                  *     Processor (CPU0, 0x00, 0x00000410, 0x06) {}
169                  *     Processor (CPU1, 0x01, 0x00000410, 0x06) {}
170                  *     Processor (CPU2, 0x02, 0x00000410, 0x06) {}
171                  *     Processor (CPU3, 0x03, 0x00000410, 0x06) {}
172                  * }
173                  *
174                  * Ignores apic_id and always returns 0 for the processor
175                  * handle with acpi id 0 if nr_cpu_ids is 1.
176                  * This should be the case if SMP tables are not found.
177                  * Return -1 for other CPU's handle.
178                  */
179                 if (nr_cpu_ids <= 1 && acpi_id == 0)
180                         return acpi_id;
181                 else
182                         return apic_id;
183         }
184 
185 #ifdef CONFIG_SMP
186         for_each_possible_cpu(i) {
187                 if (cpu_physical_id(i) == apic_id)
188                         return i;
189         }
190 #else
191         /* In UP kernel, only processor 0 is valid */
192         if (apic_id == 0)
193                 return apic_id;
194 #endif
195         return -1;
196 }
197 
198 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
199 {
200         int apic_id;
201 
202         apic_id = acpi_get_apicid(handle, type, acpi_id);
203 
204         return acpi_map_cpuid(apic_id, acpi_id);
205 }
206 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
207 

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