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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  * I/O APIC hotplug support
  9  *      Yinghai Lu <yinghai@kernel.org>
 10  *      Jiang Liu <jiang.liu@intel.com>
 11  */
 12 #include <linux/export.h>
 13 #include <linux/acpi.h>
 14 #include <acpi/processor.h>
 15 
 16 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
 17 ACPI_MODULE_NAME("processor_core");
 18 
 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 
 34 static int map_lapic_id(struct acpi_subtable_header *entry,
 35                  u32 acpi_id, int *apic_id)
 36 {
 37         struct acpi_madt_local_apic *lapic =
 38                 container_of(entry, struct acpi_madt_local_apic, header);
 39 
 40         if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
 41                 return -ENODEV;
 42 
 43         if (lapic->processor_id != acpi_id)
 44                 return -EINVAL;
 45 
 46         *apic_id = lapic->id;
 47         return 0;
 48 }
 49 
 50 static int map_x2apic_id(struct acpi_subtable_header *entry,
 51                          int device_declaration, u32 acpi_id, int *apic_id)
 52 {
 53         struct acpi_madt_local_x2apic *apic =
 54                 container_of(entry, struct acpi_madt_local_x2apic, header);
 55 
 56         if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
 57                 return -ENODEV;
 58 
 59         if (device_declaration && (apic->uid == acpi_id)) {
 60                 *apic_id = apic->local_apic_id;
 61                 return 0;
 62         }
 63 
 64         return -EINVAL;
 65 }
 66 
 67 static int map_lsapic_id(struct acpi_subtable_header *entry,
 68                 int device_declaration, u32 acpi_id, int *apic_id)
 69 {
 70         struct acpi_madt_local_sapic *lsapic =
 71                 container_of(entry, struct acpi_madt_local_sapic, header);
 72 
 73         if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 74                 return -ENODEV;
 75 
 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;
 81 
 82         *apic_id = (lsapic->id << 8) | lsapic->eid;
 83         return 0;
 84 }
 85 
 86 static int map_madt_entry(int type, u32 acpi_id)
 87 {
 88         unsigned long madt_end, entry;
 89         int phys_id = -1;       /* CPU hardware ID */
 90         struct acpi_table_madt *madt;
 91 
 92         madt = get_madt_table();
 93         if (!madt)
 94                 return phys_id;
 95 
 96         entry = (unsigned long)madt;
 97         madt_end = entry + madt->header.length;
 98 
 99         /* Parse all entries looking for a match. */
100 
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))
107                                 break;
108                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
109                         if (!map_x2apic_id(header, type, acpi_id, &phys_id))
110                                 break;
111                 } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
112                         if (!map_lsapic_id(header, type, acpi_id, &phys_id))
113                                 break;
114                 }
115                 entry += header->length;
116         }
117         return phys_id;
118 }
119 
120 static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
121 {
122         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
123         union acpi_object *obj;
124         struct acpi_subtable_header *header;
125         int phys_id = -1;
126 
127         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
128                 goto exit;
129 
130         if (!buffer.length || !buffer.pointer)
131                 goto exit;
132 
133         obj = buffer.pointer;
134         if (obj->type != ACPI_TYPE_BUFFER ||
135             obj->buffer.length < sizeof(struct acpi_subtable_header)) {
136                 goto exit;
137         }
138 
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);
146 
147 exit:
148         kfree(buffer.pointer);
149         return phys_id;
150 }
151 
152 int acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
153 {
154         int phys_id;
155 
156         phys_id = map_mat_entry(handle, type, acpi_id);
157         if (phys_id == -1)
158                 phys_id = map_madt_entry(type, acpi_id);
159 
160         return phys_id;
161 }
162 
163 int acpi_map_cpuid(int phys_id, u32 acpi_id)
164 {
165 #ifdef CONFIG_SMP
166         int i;
167 #endif
168 
169         if (phys_id == -1) {
170                 /*
171                  * On UP processor, there is no _MAT or MADT table.
172                  * So above phys_id is always set to -1.
173                  *
174                  * BIOS may define multiple CPU handles even for UP processor.
175                  * For example,
176                  *
177                  * Scope (_PR)
178                  * {
179                  *     Processor (CPU0, 0x00, 0x00000410, 0x06) {}
180                  *     Processor (CPU1, 0x01, 0x00000410, 0x06) {}
181                  *     Processor (CPU2, 0x02, 0x00000410, 0x06) {}
182                  *     Processor (CPU3, 0x03, 0x00000410, 0x06) {}
183                  * }
184                  *
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.
189                  */
190                 if (nr_cpu_ids <= 1 && acpi_id == 0)
191                         return acpi_id;
192                 else
193                         return phys_id;
194         }
195 
196 #ifdef CONFIG_SMP
197         for_each_possible_cpu(i) {
198                 if (cpu_physical_id(i) == phys_id)
199                         return i;
200         }
201 #else
202         /* In UP kernel, only processor 0 is valid */
203         if (phys_id == 0)
204                 return phys_id;
205 #endif
206         return -1;
207 }
208 
209 int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
210 {
211         int phys_id;
212 
213         phys_id = acpi_get_phys_id(handle, type, acpi_id);
214 
215         return acpi_map_cpuid(phys_id, acpi_id);
216 }
217 EXPORT_SYMBOL_GPL(acpi_get_cpuid);
218 
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)
222 {
223         struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
224 
225         if (ioapic->global_irq_base != gsi_base)
226                 return 0;
227 
228         *phys_addr = ioapic->address;
229         *ioapic_id = ioapic->id;
230         return 1;
231 }
232 
233 static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
234 {
235         struct acpi_subtable_header *hdr;
236         unsigned long madt_end, entry;
237         struct acpi_table_madt *madt;
238         int apic_id = -1;
239 
240         madt = get_madt_table();
241         if (!madt)
242                 return apic_id;
243 
244         entry = (unsigned long)madt;
245         madt_end = entry + madt->header.length;
246 
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))
253                         break;
254                 else
255                         entry += hdr->length;
256         }
257 
258         return apic_id;
259 }
260 
261 static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
262                                   u64 *phys_addr)
263 {
264         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
265         struct acpi_subtable_header *header;
266         union acpi_object *obj;
267         int apic_id = -1;
268 
269         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
270                 goto exit;
271 
272         if (!buffer.length || !buffer.pointer)
273                 goto exit;
274 
275         obj = buffer.pointer;
276         if (obj->type != ACPI_TYPE_BUFFER ||
277             obj->buffer.length < sizeof(struct acpi_subtable_header))
278                 goto exit;
279 
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);
283 
284 exit:
285         kfree(buffer.pointer);
286         return apic_id;
287 }
288 
289 /**
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
294  *
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.
299  */
300 int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
301 {
302         int apic_id;
303 
304         apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
305         if (apic_id == -1)
306                 apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
307 
308         return apic_id;
309 }
310 #endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */
311 

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