1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * acpi_tables.c - ACPI Boot-Time Table Parsing 4 * 5 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 */ 7 8 /* Uncomment next line to get verbose printout */ 9 /* #define DEBUG */ 10 #define pr_fmt(fmt) "ACPI: " fmt 11 12 #include <linux/init.h> 13 #include <linux/kernel.h> 14 #include <linux/smp.h> 15 #include <linux/string.h> 16 #include <linux/types.h> 17 #include <linux/irq.h> 18 #include <linux/errno.h> 19 #include <linux/acpi.h> 20 #include <linux/memblock.h> 21 #include <linux/earlycpio.h> 22 #include <linux/initrd.h> 23 #include <linux/security.h> 24 #include <linux/kmemleak.h> 25 #include "internal.h" 26 27 #ifdef CONFIG_ACPI_CUSTOM_DSDT 28 #include CONFIG_ACPI_CUSTOM_DSDT_FILE 29 #endif 30 31 #define ACPI_MAX_TABLES 128 32 33 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 34 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 35 36 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 37 38 static int acpi_apic_instance __initdata_or_acpilib; 39 40 enum acpi_subtable_type { 41 ACPI_SUBTABLE_COMMON, 42 ACPI_SUBTABLE_HMAT, 43 ACPI_SUBTABLE_PRMT, 44 ACPI_SUBTABLE_CEDT, 45 }; 46 47 struct acpi_subtable_entry { 48 union acpi_subtable_headers *hdr; 49 enum acpi_subtable_type type; 50 }; 51 52 /* 53 * Disable table checksum verification for the early stage due to the size 54 * limitation of the current x86 early mapping implementation. 55 */ 56 static bool acpi_verify_table_checksum __initdata_or_acpilib = false; 57 58 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 59 { 60 if (!header) 61 return; 62 63 switch (header->type) { 64 65 case ACPI_MADT_TYPE_LOCAL_APIC: 66 { 67 struct acpi_madt_local_apic *p = 68 (struct acpi_madt_local_apic *)header; 69 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 70 p->processor_id, p->id, 71 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 72 } 73 break; 74 75 case ACPI_MADT_TYPE_LOCAL_X2APIC: 76 { 77 struct acpi_madt_local_x2apic *p = 78 (struct acpi_madt_local_x2apic *)header; 79 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 80 p->local_apic_id, p->uid, 81 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 82 } 83 break; 84 85 case ACPI_MADT_TYPE_IO_APIC: 86 { 87 struct acpi_madt_io_apic *p = 88 (struct acpi_madt_io_apic *)header; 89 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 90 p->id, p->address, p->global_irq_base); 91 } 92 break; 93 94 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 95 { 96 struct acpi_madt_interrupt_override *p = 97 (struct acpi_madt_interrupt_override *)header; 98 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 99 p->bus, p->source_irq, p->global_irq, 100 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 101 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 102 if (p->inti_flags & 103 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 104 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 105 p->inti_flags & 106 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 107 } 108 break; 109 110 case ACPI_MADT_TYPE_NMI_SOURCE: 111 { 112 struct acpi_madt_nmi_source *p = 113 (struct acpi_madt_nmi_source *)header; 114 pr_info("NMI_SRC (%s %s global_irq %d)\n", 115 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 116 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 117 p->global_irq); 118 } 119 break; 120 121 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 122 { 123 struct acpi_madt_local_apic_nmi *p = 124 (struct acpi_madt_local_apic_nmi *)header; 125 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 126 p->processor_id, 127 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 128 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 129 p->lint); 130 } 131 break; 132 133 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 134 { 135 u16 polarity, trigger; 136 struct acpi_madt_local_x2apic_nmi *p = 137 (struct acpi_madt_local_x2apic_nmi *)header; 138 139 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 140 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 141 142 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 143 p->uid, 144 mps_inti_flags_polarity[polarity], 145 mps_inti_flags_trigger[trigger], 146 p->lint); 147 } 148 break; 149 150 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 151 { 152 struct acpi_madt_local_apic_override *p = 153 (struct acpi_madt_local_apic_override *)header; 154 pr_info("LAPIC_ADDR_OVR (address[0x%llx])\n", 155 p->address); 156 } 157 break; 158 159 case ACPI_MADT_TYPE_IO_SAPIC: 160 { 161 struct acpi_madt_io_sapic *p = 162 (struct acpi_madt_io_sapic *)header; 163 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 164 p->id, (void *)(unsigned long)p->address, 165 p->global_irq_base); 166 } 167 break; 168 169 case ACPI_MADT_TYPE_LOCAL_SAPIC: 170 { 171 struct acpi_madt_local_sapic *p = 172 (struct acpi_madt_local_sapic *)header; 173 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 174 p->processor_id, p->id, p->eid, 175 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 176 } 177 break; 178 179 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 180 { 181 struct acpi_madt_interrupt_source *p = 182 (struct acpi_madt_interrupt_source *)header; 183 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", 184 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 185 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 186 p->type, p->id, p->eid, p->io_sapic_vector, 187 p->global_irq); 188 } 189 break; 190 191 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 192 { 193 struct acpi_madt_generic_interrupt *p = 194 (struct acpi_madt_generic_interrupt *)header; 195 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 196 p->uid, p->base_address, 197 p->arm_mpidr, 198 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 199 200 } 201 break; 202 203 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 204 { 205 struct acpi_madt_generic_distributor *p = 206 (struct acpi_madt_generic_distributor *)header; 207 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 208 p->gic_id, p->base_address, 209 p->global_irq_base); 210 } 211 break; 212 213 case ACPI_MADT_TYPE_CORE_PIC: 214 { 215 struct acpi_madt_core_pic *p = (struct acpi_madt_core_pic *)header; 216 217 pr_debug("CORE PIC (processor_id[0x%02x] core_id[0x%02x] %s)\n", 218 p->processor_id, p->core_id, 219 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 220 } 221 break; 222 223 default: 224 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 225 header->type); 226 break; 227 } 228 } 229 230 static unsigned long __init_or_acpilib 231 acpi_get_entry_type(struct acpi_subtable_entry *entry) 232 { 233 switch (entry->type) { 234 case ACPI_SUBTABLE_COMMON: 235 return entry->hdr->common.type; 236 case ACPI_SUBTABLE_HMAT: 237 return entry->hdr->hmat.type; 238 case ACPI_SUBTABLE_PRMT: 239 return 0; 240 case ACPI_SUBTABLE_CEDT: 241 return entry->hdr->cedt.type; 242 } 243 return 0; 244 } 245 246 static unsigned long __init_or_acpilib 247 acpi_get_entry_length(struct acpi_subtable_entry *entry) 248 { 249 switch (entry->type) { 250 case ACPI_SUBTABLE_COMMON: 251 return entry->hdr->common.length; 252 case ACPI_SUBTABLE_HMAT: 253 return entry->hdr->hmat.length; 254 case ACPI_SUBTABLE_PRMT: 255 return entry->hdr->prmt.length; 256 case ACPI_SUBTABLE_CEDT: 257 return entry->hdr->cedt.length; 258 } 259 return 0; 260 } 261 262 static unsigned long __init_or_acpilib 263 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry) 264 { 265 switch (entry->type) { 266 case ACPI_SUBTABLE_COMMON: 267 return sizeof(entry->hdr->common); 268 case ACPI_SUBTABLE_HMAT: 269 return sizeof(entry->hdr->hmat); 270 case ACPI_SUBTABLE_PRMT: 271 return sizeof(entry->hdr->prmt); 272 case ACPI_SUBTABLE_CEDT: 273 return sizeof(entry->hdr->cedt); 274 } 275 return 0; 276 } 277 278 static enum acpi_subtable_type __init_or_acpilib 279 acpi_get_subtable_type(char *id) 280 { 281 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0) 282 return ACPI_SUBTABLE_HMAT; 283 if (strncmp(id, ACPI_SIG_PRMT, 4) == 0) 284 return ACPI_SUBTABLE_PRMT; 285 if (strncmp(id, ACPI_SIG_CEDT, 4) == 0) 286 return ACPI_SUBTABLE_CEDT; 287 return ACPI_SUBTABLE_COMMON; 288 } 289 290 static __init_or_acpilib bool has_handler(struct acpi_subtable_proc *proc) 291 { 292 return proc->handler || proc->handler_arg; 293 } 294 295 static __init_or_acpilib int call_handler(struct acpi_subtable_proc *proc, 296 union acpi_subtable_headers *hdr, 297 unsigned long end) 298 { 299 if (proc->handler) 300 return proc->handler(hdr, end); 301 if (proc->handler_arg) 302 return proc->handler_arg(hdr, proc->arg, end); 303 return -EINVAL; 304 } 305 306 /** 307 * acpi_parse_entries_array - for each proc_num find a suitable subtable 308 * 309 * @id: table id (for debugging purposes) 310 * @table_size: size of the root table 311 * @table_header: where does the table start? 312 * @proc: array of acpi_subtable_proc struct containing entry id 313 * and associated handler with it 314 * @proc_num: how big proc is? 315 * @max_entries: how many entries can we process? 316 * 317 * For each proc_num find a subtable with proc->id and run proc->handler 318 * on it. Assumption is that there's only single handler for particular 319 * entry id. 320 * 321 * The table_size is not the size of the complete ACPI table (the length 322 * field in the header struct), but only the size of the root table; i.e., 323 * the offset from the very first byte of the complete ACPI table, to the 324 * first byte of the very first subtable. 325 * 326 * On success returns sum of all matching entries for all proc handlers. 327 * Otherwise, -ENODEV or -EINVAL is returned. 328 */ 329 static int __init_or_acpilib acpi_parse_entries_array( 330 char *id, unsigned long table_size, 331 struct acpi_table_header *table_header, struct acpi_subtable_proc *proc, 332 int proc_num, unsigned int max_entries) 333 { 334 struct acpi_subtable_entry entry; 335 unsigned long table_end, subtable_len, entry_len; 336 int count = 0; 337 int errs = 0; 338 int i; 339 340 table_end = (unsigned long)table_header + table_header->length; 341 342 /* Parse all entries looking for a match. */ 343 344 entry.type = acpi_get_subtable_type(id); 345 entry.hdr = (union acpi_subtable_headers *) 346 ((unsigned long)table_header + table_size); 347 subtable_len = acpi_get_subtable_header_length(&entry); 348 349 while (((unsigned long)entry.hdr) + subtable_len < table_end) { 350 if (max_entries && count >= max_entries) 351 break; 352 353 for (i = 0; i < proc_num; i++) { 354 if (acpi_get_entry_type(&entry) != proc[i].id) 355 continue; 356 if (!has_handler(&proc[i]) || 357 (!errs && 358 call_handler(&proc[i], entry.hdr, table_end))) { 359 errs++; 360 continue; 361 } 362 363 proc[i].count++; 364 break; 365 } 366 if (i != proc_num) 367 count++; 368 369 /* 370 * If entry->length is 0, break from this loop to avoid 371 * infinite loop. 372 */ 373 entry_len = acpi_get_entry_length(&entry); 374 if (entry_len == 0) { 375 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); 376 return -EINVAL; 377 } 378 379 entry.hdr = (union acpi_subtable_headers *) 380 ((unsigned long)entry.hdr + entry_len); 381 } 382 383 if (max_entries && count > max_entries) { 384 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n", 385 id, proc->id, count); 386 } 387 388 return errs ? -EINVAL : count; 389 } 390 391 int __init_or_acpilib acpi_table_parse_entries_array( 392 char *id, unsigned long table_size, struct acpi_subtable_proc *proc, 393 int proc_num, unsigned int max_entries) 394 { 395 struct acpi_table_header *table_header = NULL; 396 int count; 397 u32 instance = 0; 398 399 if (acpi_disabled) 400 return -ENODEV; 401 402 if (!id) 403 return -EINVAL; 404 405 if (!table_size) 406 return -EINVAL; 407 408 if (!strncmp(id, ACPI_SIG_MADT, 4)) 409 instance = acpi_apic_instance; 410 411 acpi_get_table(id, instance, &table_header); 412 if (!table_header) { 413 pr_debug("%4.4s not present\n", id); 414 return -ENODEV; 415 } 416 417 count = acpi_parse_entries_array(id, table_size, table_header, 418 proc, proc_num, max_entries); 419 420 acpi_put_table(table_header); 421 return count; 422 } 423 424 static int __init_or_acpilib __acpi_table_parse_entries( 425 char *id, unsigned long table_size, int entry_id, 426 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg, 427 void *arg, unsigned int max_entries) 428 { 429 struct acpi_subtable_proc proc = { 430 .id = entry_id, 431 .handler = handler, 432 .handler_arg = handler_arg, 433 .arg = arg, 434 }; 435 436 return acpi_table_parse_entries_array(id, table_size, &proc, 1, 437 max_entries); 438 } 439 440 int __init_or_acpilib 441 acpi_table_parse_cedt(enum acpi_cedt_type id, 442 acpi_tbl_entry_handler_arg handler_arg, void *arg) 443 { 444 return __acpi_table_parse_entries(ACPI_SIG_CEDT, 445 sizeof(struct acpi_table_cedt), id, 446 NULL, handler_arg, arg, 0); 447 } 448 EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt); 449 450 int __init acpi_table_parse_entries(char *id, unsigned long table_size, 451 int entry_id, 452 acpi_tbl_entry_handler handler, 453 unsigned int max_entries) 454 { 455 return __acpi_table_parse_entries(id, table_size, entry_id, handler, 456 NULL, NULL, max_entries); 457 } 458 459 int __init acpi_table_parse_madt(enum acpi_madt_type id, 460 acpi_tbl_entry_handler handler, unsigned int max_entries) 461 { 462 return acpi_table_parse_entries(ACPI_SIG_MADT, 463 sizeof(struct acpi_table_madt), id, 464 handler, max_entries); 465 } 466 467 /** 468 * acpi_table_parse - find table with @id, run @handler on it 469 * @id: table id to find 470 * @handler: handler to run 471 * 472 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 473 * run @handler on it. 474 * 475 * Return 0 if table found, -errno if not. 476 */ 477 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 478 { 479 struct acpi_table_header *table = NULL; 480 481 if (acpi_disabled) 482 return -ENODEV; 483 484 if (!id || !handler) 485 return -EINVAL; 486 487 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 488 acpi_get_table(id, acpi_apic_instance, &table); 489 else 490 acpi_get_table(id, 0, &table); 491 492 if (table) { 493 handler(table); 494 acpi_put_table(table); 495 return 0; 496 } else 497 return -ENODEV; 498 } 499 500 /* 501 * The BIOS is supposed to supply a single APIC/MADT, 502 * but some report two. Provide a knob to use either. 503 * (don't you wish instance 0 and 1 were not the same?) 504 */ 505 static void __init check_multiple_madt(void) 506 { 507 struct acpi_table_header *table = NULL; 508 509 acpi_get_table(ACPI_SIG_MADT, 2, &table); 510 if (table) { 511 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 512 acpi_apic_instance); 513 pr_warn("If \"acpi_apic_instance=%d\" works better, " 514 "notify linux-acpi@vger.kernel.org\n", 515 acpi_apic_instance ? 0 : 2); 516 acpi_put_table(table); 517 518 } else 519 acpi_apic_instance = 0; 520 521 return; 522 } 523 524 static void acpi_table_taint(struct acpi_table_header *table) 525 { 526 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n", 527 table->signature, table->oem_table_id); 528 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); 529 } 530 531 #ifdef CONFIG_ACPI_TABLE_UPGRADE 532 static u64 acpi_tables_addr; 533 static int all_tables_size; 534 535 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */ 536 static u8 __init acpi_table_checksum(u8 *buffer, u32 length) 537 { 538 u8 sum = 0; 539 u8 *end = buffer + length; 540 541 while (buffer < end) 542 sum = (u8) (sum + *(buffer++)); 543 return sum; 544 } 545 546 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */ 547 static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = { 548 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, 549 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, 550 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, 551 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, 552 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, 553 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, 554 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, 555 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, 556 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, 557 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, 558 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI, 559 ACPI_SIG_NBFT }; 560 561 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) 562 563 #define NR_ACPI_INITRD_TABLES 64 564 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; 565 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); 566 567 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) 568 569 void __init acpi_table_upgrade(void) 570 { 571 void *data; 572 size_t size; 573 int sig, no, table_nr = 0, total_offset = 0; 574 long offset = 0; 575 struct acpi_table_header *table; 576 char cpio_path[32] = "kernel/firmware/acpi/"; 577 struct cpio_data file; 578 579 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) { 580 data = __initramfs_start; 581 size = __initramfs_size; 582 } else { 583 data = (void *)initrd_start; 584 size = initrd_end - initrd_start; 585 } 586 587 if (data == NULL || size == 0) 588 return; 589 590 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { 591 file = find_cpio_data(cpio_path, data, size, &offset); 592 if (!file.data) 593 break; 594 595 data += offset; 596 size -= offset; 597 598 if (file.size < sizeof(struct acpi_table_header)) { 599 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n", 600 cpio_path, file.name); 601 continue; 602 } 603 604 table = file.data; 605 606 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++) 607 if (!memcmp(table->signature, table_sigs[sig], 4)) 608 break; 609 610 if (sig >= ARRAY_SIZE(table_sigs)) { 611 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n", 612 cpio_path, file.name); 613 continue; 614 } 615 if (file.size != table->length) { 616 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n", 617 cpio_path, file.name); 618 continue; 619 } 620 if (acpi_table_checksum(file.data, table->length)) { 621 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n", 622 cpio_path, file.name); 623 continue; 624 } 625 626 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n", 627 table->signature, cpio_path, file.name, table->length); 628 629 all_tables_size += table->length; 630 acpi_initrd_files[table_nr].data = file.data; 631 acpi_initrd_files[table_nr].size = file.size; 632 table_nr++; 633 } 634 if (table_nr == 0) 635 return; 636 637 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) { 638 pr_notice("kernel is locked down, ignoring table override\n"); 639 return; 640 } 641 642 acpi_tables_addr = 643 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE, 644 0, ACPI_TABLE_UPGRADE_MAX_PHYS); 645 if (!acpi_tables_addr) { 646 WARN_ON(1); 647 return; 648 } 649 /* 650 * Only calling e820_add_reserve does not work and the 651 * tables are invalid (memory got used) later. 652 * memblock_reserve works as expected and the tables won't get modified. 653 * But it's not enough on X86 because ioremap will 654 * complain later (used by acpi_os_map_memory) that the pages 655 * that should get mapped are not marked "reserved". 656 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area) 657 * works fine. 658 */ 659 arch_reserve_mem_area(acpi_tables_addr, all_tables_size); 660 661 kmemleak_ignore_phys(acpi_tables_addr); 662 663 /* 664 * early_ioremap only can remap 256k one time. If we map all 665 * tables one time, we will hit the limit. Need to map chunks 666 * one by one during copying the same as that in relocate_initrd(). 667 */ 668 for (no = 0; no < table_nr; no++) { 669 unsigned char *src_p = acpi_initrd_files[no].data; 670 phys_addr_t size = acpi_initrd_files[no].size; 671 phys_addr_t dest_addr = acpi_tables_addr + total_offset; 672 phys_addr_t slop, clen; 673 char *dest_p; 674 675 total_offset += size; 676 677 while (size) { 678 slop = dest_addr & ~PAGE_MASK; 679 clen = size; 680 if (clen > MAP_CHUNK_SIZE - slop) 681 clen = MAP_CHUNK_SIZE - slop; 682 dest_p = early_memremap(dest_addr & PAGE_MASK, 683 clen + slop); 684 memcpy(dest_p + slop, src_p, clen); 685 early_memunmap(dest_p, clen + slop); 686 src_p += clen; 687 dest_addr += clen; 688 size -= clen; 689 } 690 } 691 } 692 693 static acpi_status 694 acpi_table_initrd_override(struct acpi_table_header *existing_table, 695 acpi_physical_address *address, u32 *length) 696 { 697 int table_offset = 0; 698 int table_index = 0; 699 struct acpi_table_header *table; 700 u32 table_length; 701 702 *length = 0; 703 *address = 0; 704 if (!acpi_tables_addr) 705 return AE_OK; 706 707 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 708 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 709 ACPI_HEADER_SIZE); 710 if (table_offset + table->length > all_tables_size) { 711 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 712 WARN_ON(1); 713 return AE_OK; 714 } 715 716 table_length = table->length; 717 718 /* Only override tables matched */ 719 if (memcmp(existing_table->signature, table->signature, 4) || 720 memcmp(table->oem_id, existing_table->oem_id, 721 ACPI_OEM_ID_SIZE) || 722 memcmp(table->oem_table_id, existing_table->oem_table_id, 723 ACPI_OEM_TABLE_ID_SIZE)) { 724 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 725 goto next_table; 726 } 727 /* 728 * Mark the table to avoid being used in 729 * acpi_table_initrd_scan() and check the revision. 730 */ 731 if (test_and_set_bit(table_index, acpi_initrd_installed) || 732 existing_table->oem_revision >= table->oem_revision) { 733 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 734 goto next_table; 735 } 736 737 *length = table_length; 738 *address = acpi_tables_addr + table_offset; 739 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", 740 table->signature, table->oem_id, 741 table->oem_table_id); 742 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 743 break; 744 745 next_table: 746 table_offset += table_length; 747 table_index++; 748 } 749 return AE_OK; 750 } 751 752 static void __init acpi_table_initrd_scan(void) 753 { 754 int table_offset = 0; 755 int table_index = 0; 756 u32 table_length; 757 struct acpi_table_header *table; 758 759 if (!acpi_tables_addr) 760 return; 761 762 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) { 763 table = acpi_os_map_memory(acpi_tables_addr + table_offset, 764 ACPI_HEADER_SIZE); 765 if (table_offset + table->length > all_tables_size) { 766 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 767 WARN_ON(1); 768 return; 769 } 770 771 table_length = table->length; 772 773 /* Skip RSDT/XSDT which should only be used for override */ 774 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) || 775 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) { 776 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 777 goto next_table; 778 } 779 /* 780 * Mark the table to avoid being used in 781 * acpi_table_initrd_override(). Though this is not possible 782 * because override is disabled in acpi_install_physical_table(). 783 */ 784 if (test_and_set_bit(table_index, acpi_initrd_installed)) { 785 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 786 goto next_table; 787 } 788 789 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", 790 table->signature, table->oem_id, 791 table->oem_table_id); 792 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); 793 acpi_install_physical_table(acpi_tables_addr + table_offset); 794 next_table: 795 table_offset += table_length; 796 table_index++; 797 } 798 } 799 #else 800 static acpi_status 801 acpi_table_initrd_override(struct acpi_table_header *existing_table, 802 acpi_physical_address *address, 803 u32 *table_length) 804 { 805 *table_length = 0; 806 *address = 0; 807 return AE_OK; 808 } 809 810 static void __init acpi_table_initrd_scan(void) 811 { 812 } 813 #endif /* CONFIG_ACPI_TABLE_UPGRADE */ 814 815 acpi_status 816 acpi_os_physical_table_override(struct acpi_table_header *existing_table, 817 acpi_physical_address *address, 818 u32 *table_length) 819 { 820 return acpi_table_initrd_override(existing_table, address, 821 table_length); 822 } 823 824 #ifdef CONFIG_ACPI_CUSTOM_DSDT 825 static void *amlcode __attribute__ ((weakref("AmlCode"))); 826 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code"))); 827 #endif 828 829 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table, 830 struct acpi_table_header **new_table) 831 { 832 if (!existing_table || !new_table) 833 return AE_BAD_PARAMETER; 834 835 *new_table = NULL; 836 837 #ifdef CONFIG_ACPI_CUSTOM_DSDT 838 if (!strncmp(existing_table->signature, "DSDT", 4)) { 839 *new_table = (struct acpi_table_header *)&amlcode; 840 if (!(*new_table)) 841 *new_table = (struct acpi_table_header *)&dsdt_amlcode; 842 } 843 #endif 844 if (*new_table != NULL) 845 acpi_table_taint(existing_table); 846 return AE_OK; 847 } 848 849 /* 850 * acpi_locate_initial_tables() 851 * 852 * Get the RSDP, then find and checksum all the ACPI tables. 853 * 854 * result: initial_tables[] is initialized, and points to 855 * a list of ACPI tables. 856 */ 857 int __init acpi_locate_initial_tables(void) 858 { 859 acpi_status status; 860 861 if (acpi_verify_table_checksum) { 862 pr_info("Early table checksum verification enabled\n"); 863 acpi_gbl_enable_table_validation = TRUE; 864 } else { 865 pr_info("Early table checksum verification disabled\n"); 866 acpi_gbl_enable_table_validation = FALSE; 867 } 868 869 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 870 if (ACPI_FAILURE(status)) 871 return -EINVAL; 872 873 return 0; 874 } 875 876 void __init acpi_reserve_initial_tables(void) 877 { 878 int i; 879 880 for (i = 0; i < ACPI_MAX_TABLES; i++) { 881 struct acpi_table_desc *table_desc = &initial_tables[i]; 882 u64 start = table_desc->address; 883 u64 size = table_desc->length; 884 885 if (!start || !size) 886 break; 887 888 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n", 889 table_desc->signature.ascii, start, start + size - 1); 890 891 memblock_reserve(start, size); 892 } 893 } 894 895 void __init acpi_table_init_complete(void) 896 { 897 acpi_table_initrd_scan(); 898 check_multiple_madt(); 899 } 900 901 int __init acpi_table_init(void) 902 { 903 int ret; 904 905 ret = acpi_locate_initial_tables(); 906 if (ret) 907 return ret; 908 909 acpi_table_init_complete(); 910 911 return 0; 912 } 913 914 static int __init acpi_parse_apic_instance(char *str) 915 { 916 if (!str) 917 return -EINVAL; 918 919 if (kstrtoint(str, 0, &acpi_apic_instance)) 920 return -EINVAL; 921 922 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 923 924 return 0; 925 } 926 early_param("acpi_apic_instance", acpi_parse_apic_instance); 927 928 static int __init acpi_force_table_verification_setup(char *s) 929 { 930 acpi_verify_table_checksum = true; 931 932 return 0; 933 } 934 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 935 936 static int __init acpi_force_32bit_fadt_addr(char *s) 937 { 938 pr_info("Forcing 32 Bit FADT addresses\n"); 939 acpi_gbl_use32_bit_fadt_addresses = TRUE; 940 941 return 0; 942 } 943 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr); 944