1 /* 2 * acpi_tables.c - ACPI Boot-Time Table Parsing 3 * 4 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * 6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 19 * 20 */ 21 22 /* Uncomment next line to get verbose printout */ 23 /* #define DEBUG */ 24 #define pr_fmt(fmt) "ACPI: " fmt 25 26 #include <linux/init.h> 27 #include <linux/kernel.h> 28 #include <linux/smp.h> 29 #include <linux/string.h> 30 #include <linux/types.h> 31 #include <linux/irq.h> 32 #include <linux/errno.h> 33 #include <linux/acpi.h> 34 #include <linux/bootmem.h> 35 36 #define ACPI_MAX_TABLES 128 37 38 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 39 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 40 41 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 42 43 static int acpi_apic_instance __initdata; 44 45 /* 46 * Disable table checksum verification for the early stage due to the size 47 * limitation of the current x86 early mapping implementation. 48 */ 49 static bool acpi_verify_table_checksum __initdata = false; 50 51 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 52 { 53 if (!header) 54 return; 55 56 switch (header->type) { 57 58 case ACPI_MADT_TYPE_LOCAL_APIC: 59 { 60 struct acpi_madt_local_apic *p = 61 (struct acpi_madt_local_apic *)header; 62 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 63 p->processor_id, p->id, 64 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 65 } 66 break; 67 68 case ACPI_MADT_TYPE_LOCAL_X2APIC: 69 { 70 struct acpi_madt_local_x2apic *p = 71 (struct acpi_madt_local_x2apic *)header; 72 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 73 p->local_apic_id, p->uid, 74 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 75 } 76 break; 77 78 case ACPI_MADT_TYPE_IO_APIC: 79 { 80 struct acpi_madt_io_apic *p = 81 (struct acpi_madt_io_apic *)header; 82 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 83 p->id, p->address, p->global_irq_base); 84 } 85 break; 86 87 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 88 { 89 struct acpi_madt_interrupt_override *p = 90 (struct acpi_madt_interrupt_override *)header; 91 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 92 p->bus, p->source_irq, p->global_irq, 93 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 94 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 95 if (p->inti_flags & 96 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 97 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 98 p->inti_flags & 99 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 100 } 101 break; 102 103 case ACPI_MADT_TYPE_NMI_SOURCE: 104 { 105 struct acpi_madt_nmi_source *p = 106 (struct acpi_madt_nmi_source *)header; 107 pr_info("NMI_SRC (%s %s global_irq %d)\n", 108 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 109 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 110 p->global_irq); 111 } 112 break; 113 114 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 115 { 116 struct acpi_madt_local_apic_nmi *p = 117 (struct acpi_madt_local_apic_nmi *)header; 118 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 119 p->processor_id, 120 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 121 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 122 p->lint); 123 } 124 break; 125 126 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 127 { 128 u16 polarity, trigger; 129 struct acpi_madt_local_x2apic_nmi *p = 130 (struct acpi_madt_local_x2apic_nmi *)header; 131 132 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 133 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 134 135 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 136 p->uid, 137 mps_inti_flags_polarity[polarity], 138 mps_inti_flags_trigger[trigger], 139 p->lint); 140 } 141 break; 142 143 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 144 { 145 struct acpi_madt_local_apic_override *p = 146 (struct acpi_madt_local_apic_override *)header; 147 pr_info("LAPIC_ADDR_OVR (address[%p])\n", 148 (void *)(unsigned long)p->address); 149 } 150 break; 151 152 case ACPI_MADT_TYPE_IO_SAPIC: 153 { 154 struct acpi_madt_io_sapic *p = 155 (struct acpi_madt_io_sapic *)header; 156 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 157 p->id, (void *)(unsigned long)p->address, 158 p->global_irq_base); 159 } 160 break; 161 162 case ACPI_MADT_TYPE_LOCAL_SAPIC: 163 { 164 struct acpi_madt_local_sapic *p = 165 (struct acpi_madt_local_sapic *)header; 166 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 167 p->processor_id, p->id, p->eid, 168 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 169 } 170 break; 171 172 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 173 { 174 struct acpi_madt_interrupt_source *p = 175 (struct acpi_madt_interrupt_source *)header; 176 pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n", 177 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 178 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 179 p->type, p->id, p->eid, p->io_sapic_vector, 180 p->global_irq); 181 } 182 break; 183 184 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 185 { 186 struct acpi_madt_generic_interrupt *p = 187 (struct acpi_madt_generic_interrupt *)header; 188 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 189 p->uid, p->base_address, 190 p->arm_mpidr, 191 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 192 193 } 194 break; 195 196 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 197 { 198 struct acpi_madt_generic_distributor *p = 199 (struct acpi_madt_generic_distributor *)header; 200 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 201 p->gic_id, p->base_address, 202 p->global_irq_base); 203 } 204 break; 205 206 default: 207 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 208 header->type); 209 break; 210 } 211 } 212 213 /** 214 * acpi_parse_entries_array - for each proc_num find a suitable subtable 215 * 216 * @id: table id (for debugging purposes) 217 * @table_size: single entry size 218 * @table_header: where does the table start? 219 * @proc: array of acpi_subtable_proc struct containing entry id 220 * and associated handler with it 221 * @proc_num: how big proc is? 222 * @max_entries: how many entries can we process? 223 * 224 * For each proc_num find a subtable with proc->id and run proc->handler 225 * on it. Assumption is that there's only single handler for particular 226 * entry id. 227 * 228 * On success returns sum of all matching entries for all proc handlers. 229 * Otherwise, -ENODEV or -EINVAL is returned. 230 */ 231 static int __init 232 acpi_parse_entries_array(char *id, unsigned long table_size, 233 struct acpi_table_header *table_header, 234 struct acpi_subtable_proc *proc, int proc_num, 235 unsigned int max_entries) 236 { 237 struct acpi_subtable_header *entry; 238 unsigned long table_end; 239 int count = 0; 240 int i; 241 242 if (acpi_disabled) 243 return -ENODEV; 244 245 if (!id) 246 return -EINVAL; 247 248 if (!table_size) 249 return -EINVAL; 250 251 if (!table_header) { 252 pr_warn("%4.4s not present\n", id); 253 return -ENODEV; 254 } 255 256 table_end = (unsigned long)table_header + table_header->length; 257 258 /* Parse all entries looking for a match. */ 259 260 entry = (struct acpi_subtable_header *) 261 ((unsigned long)table_header + table_size); 262 263 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < 264 table_end) { 265 if (max_entries && count >= max_entries) 266 break; 267 268 for (i = 0; i < proc_num; i++) { 269 if (entry->type != proc[i].id) 270 continue; 271 if (!proc[i].handler || 272 proc[i].handler(entry, table_end)) 273 return -EINVAL; 274 275 proc->count++; 276 break; 277 } 278 if (i != proc_num) 279 count++; 280 281 /* 282 * If entry->length is 0, break from this loop to avoid 283 * infinite loop. 284 */ 285 if (entry->length == 0) { 286 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); 287 return -EINVAL; 288 } 289 290 entry = (struct acpi_subtable_header *) 291 ((unsigned long)entry + entry->length); 292 } 293 294 if (max_entries && count > max_entries) { 295 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n", 296 id, proc->id, count - max_entries, count); 297 } 298 299 return count; 300 } 301 302 int __init 303 acpi_parse_entries(char *id, 304 unsigned long table_size, 305 acpi_tbl_entry_handler handler, 306 struct acpi_table_header *table_header, 307 int entry_id, unsigned int max_entries) 308 { 309 struct acpi_subtable_proc proc = { 310 .id = entry_id, 311 .handler = handler, 312 }; 313 314 return acpi_parse_entries_array(id, table_size, table_header, 315 &proc, 1, max_entries); 316 } 317 318 int __init 319 acpi_table_parse_entries_array(char *id, 320 unsigned long table_size, 321 struct acpi_subtable_proc *proc, int proc_num, 322 unsigned int max_entries) 323 { 324 struct acpi_table_header *table_header = NULL; 325 acpi_size tbl_size; 326 int count; 327 u32 instance = 0; 328 329 if (acpi_disabled) 330 return -ENODEV; 331 332 if (!id) 333 return -EINVAL; 334 335 if (!strncmp(id, ACPI_SIG_MADT, 4)) 336 instance = acpi_apic_instance; 337 338 acpi_get_table_with_size(id, instance, &table_header, &tbl_size); 339 if (!table_header) { 340 pr_warn("%4.4s not present\n", id); 341 return -ENODEV; 342 } 343 344 count = acpi_parse_entries_array(id, table_size, table_header, 345 proc, proc_num, max_entries); 346 347 early_acpi_os_unmap_memory((char *)table_header, tbl_size); 348 return count; 349 } 350 351 int __init 352 acpi_table_parse_entries(char *id, 353 unsigned long table_size, 354 int entry_id, 355 acpi_tbl_entry_handler handler, 356 unsigned int max_entries) 357 { 358 struct acpi_subtable_proc proc = { 359 .id = entry_id, 360 .handler = handler, 361 }; 362 363 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 364 max_entries); 365 } 366 367 int __init 368 acpi_table_parse_madt(enum acpi_madt_type id, 369 acpi_tbl_entry_handler handler, unsigned int max_entries) 370 { 371 return acpi_table_parse_entries(ACPI_SIG_MADT, 372 sizeof(struct acpi_table_madt), id, 373 handler, max_entries); 374 } 375 376 /** 377 * acpi_table_parse - find table with @id, run @handler on it 378 * @id: table id to find 379 * @handler: handler to run 380 * 381 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 382 * run @handler on it. 383 * 384 * Return 0 if table found, -errno if not. 385 */ 386 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 387 { 388 struct acpi_table_header *table = NULL; 389 acpi_size tbl_size; 390 391 if (acpi_disabled) 392 return -ENODEV; 393 394 if (!id || !handler) 395 return -EINVAL; 396 397 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 398 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size); 399 else 400 acpi_get_table_with_size(id, 0, &table, &tbl_size); 401 402 if (table) { 403 handler(table); 404 early_acpi_os_unmap_memory(table, tbl_size); 405 return 0; 406 } else 407 return -ENODEV; 408 } 409 410 /* 411 * The BIOS is supposed to supply a single APIC/MADT, 412 * but some report two. Provide a knob to use either. 413 * (don't you wish instance 0 and 1 were not the same?) 414 */ 415 static void __init check_multiple_madt(void) 416 { 417 struct acpi_table_header *table = NULL; 418 acpi_size tbl_size; 419 420 acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size); 421 if (table) { 422 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 423 acpi_apic_instance); 424 pr_warn("If \"acpi_apic_instance=%d\" works better, " 425 "notify linux-acpi@vger.kernel.org\n", 426 acpi_apic_instance ? 0 : 2); 427 early_acpi_os_unmap_memory(table, tbl_size); 428 429 } else 430 acpi_apic_instance = 0; 431 432 return; 433 } 434 435 /* 436 * acpi_table_init() 437 * 438 * find RSDP, find and checksum SDT/XSDT. 439 * checksum all tables, print SDT/XSDT 440 * 441 * result: sdt_entry[] is initialized 442 */ 443 444 int __init acpi_table_init(void) 445 { 446 acpi_status status; 447 448 if (acpi_verify_table_checksum) { 449 pr_info("Early table checksum verification enabled\n"); 450 acpi_gbl_verify_table_checksum = TRUE; 451 } else { 452 pr_info("Early table checksum verification disabled\n"); 453 acpi_gbl_verify_table_checksum = FALSE; 454 } 455 456 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 457 if (ACPI_FAILURE(status)) 458 return -EINVAL; 459 460 check_multiple_madt(); 461 return 0; 462 } 463 464 static int __init acpi_parse_apic_instance(char *str) 465 { 466 if (!str) 467 return -EINVAL; 468 469 if (kstrtoint(str, 0, &acpi_apic_instance)) 470 return -EINVAL; 471 472 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 473 474 return 0; 475 } 476 477 early_param("acpi_apic_instance", acpi_parse_apic_instance); 478 479 static int __init acpi_force_table_verification_setup(char *s) 480 { 481 acpi_verify_table_checksum = true; 482 483 return 0; 484 } 485 486 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 487