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