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
acpi_table_print_madt_entry(struct acpi_subtable_header * header)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 case ACPI_MADT_TYPE_RINTC:
224 {
225 struct acpi_madt_rintc *p = (struct acpi_madt_rintc *)header;
226
227 pr_debug("RISC-V INTC (acpi_uid[0x%04x] hart_id[0x%llx] %s)\n",
228 p->uid, p->hart_id,
229 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
230 }
231 break;
232
233 default:
234 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
235 header->type);
236 break;
237 }
238 }
239
240 static unsigned long __init_or_acpilib
acpi_get_entry_type(struct acpi_subtable_entry * entry)241 acpi_get_entry_type(struct acpi_subtable_entry *entry)
242 {
243 switch (entry->type) {
244 case ACPI_SUBTABLE_COMMON:
245 return entry->hdr->common.type;
246 case ACPI_SUBTABLE_HMAT:
247 return entry->hdr->hmat.type;
248 case ACPI_SUBTABLE_PRMT:
249 return 0;
250 case ACPI_SUBTABLE_CEDT:
251 return entry->hdr->cedt.type;
252 }
253 return 0;
254 }
255
256 static unsigned long __init_or_acpilib
acpi_get_entry_length(struct acpi_subtable_entry * entry)257 acpi_get_entry_length(struct acpi_subtable_entry *entry)
258 {
259 switch (entry->type) {
260 case ACPI_SUBTABLE_COMMON:
261 return entry->hdr->common.length;
262 case ACPI_SUBTABLE_HMAT:
263 return entry->hdr->hmat.length;
264 case ACPI_SUBTABLE_PRMT:
265 return entry->hdr->prmt.length;
266 case ACPI_SUBTABLE_CEDT:
267 return entry->hdr->cedt.length;
268 }
269 return 0;
270 }
271
272 static unsigned long __init_or_acpilib
acpi_get_subtable_header_length(struct acpi_subtable_entry * entry)273 acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
274 {
275 switch (entry->type) {
276 case ACPI_SUBTABLE_COMMON:
277 return sizeof(entry->hdr->common);
278 case ACPI_SUBTABLE_HMAT:
279 return sizeof(entry->hdr->hmat);
280 case ACPI_SUBTABLE_PRMT:
281 return sizeof(entry->hdr->prmt);
282 case ACPI_SUBTABLE_CEDT:
283 return sizeof(entry->hdr->cedt);
284 }
285 return 0;
286 }
287
288 static enum acpi_subtable_type __init_or_acpilib
acpi_get_subtable_type(char * id)289 acpi_get_subtable_type(char *id)
290 {
291 if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
292 return ACPI_SUBTABLE_HMAT;
293 if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
294 return ACPI_SUBTABLE_PRMT;
295 if (strncmp(id, ACPI_SIG_CEDT, 4) == 0)
296 return ACPI_SUBTABLE_CEDT;
297 return ACPI_SUBTABLE_COMMON;
298 }
299
has_handler(struct acpi_subtable_proc * proc)300 static __init_or_acpilib bool has_handler(struct acpi_subtable_proc *proc)
301 {
302 return proc->handler || proc->handler_arg;
303 }
304
call_handler(struct acpi_subtable_proc * proc,union acpi_subtable_headers * hdr,unsigned long end)305 static __init_or_acpilib int call_handler(struct acpi_subtable_proc *proc,
306 union acpi_subtable_headers *hdr,
307 unsigned long end)
308 {
309 if (proc->handler)
310 return proc->handler(hdr, end);
311 if (proc->handler_arg)
312 return proc->handler_arg(hdr, proc->arg, end);
313 return -EINVAL;
314 }
315
316 /**
317 * acpi_parse_entries_array - for each proc_num find a suitable subtable
318 *
319 * @id: table id (for debugging purposes)
320 * @table_size: size of the root table
321 * @table_header: where does the table start?
322 * @proc: array of acpi_subtable_proc struct containing entry id
323 * and associated handler with it
324 * @proc_num: how big proc is?
325 * @max_entries: how many entries can we process?
326 *
327 * For each proc_num find a subtable with proc->id and run proc->handler
328 * on it. Assumption is that there's only single handler for particular
329 * entry id.
330 *
331 * The table_size is not the size of the complete ACPI table (the length
332 * field in the header struct), but only the size of the root table; i.e.,
333 * the offset from the very first byte of the complete ACPI table, to the
334 * first byte of the very first subtable.
335 *
336 * On success returns sum of all matching entries for all proc handlers.
337 * Otherwise, -ENODEV or -EINVAL is returned.
338 */
acpi_parse_entries_array(char * id,unsigned long table_size,struct acpi_table_header * table_header,struct acpi_subtable_proc * proc,int proc_num,unsigned int max_entries)339 static int __init_or_acpilib acpi_parse_entries_array(
340 char *id, unsigned long table_size,
341 struct acpi_table_header *table_header, struct acpi_subtable_proc *proc,
342 int proc_num, unsigned int max_entries)
343 {
344 struct acpi_subtable_entry entry;
345 unsigned long table_end, subtable_len, entry_len;
346 int count = 0;
347 int errs = 0;
348 int i;
349
350 table_end = (unsigned long)table_header + table_header->length;
351
352 /* Parse all entries looking for a match. */
353
354 entry.type = acpi_get_subtable_type(id);
355 entry.hdr = (union acpi_subtable_headers *)
356 ((unsigned long)table_header + table_size);
357 subtable_len = acpi_get_subtable_header_length(&entry);
358
359 while (((unsigned long)entry.hdr) + subtable_len < table_end) {
360 if (max_entries && count >= max_entries)
361 break;
362
363 for (i = 0; i < proc_num; i++) {
364 if (acpi_get_entry_type(&entry) != proc[i].id)
365 continue;
366 if (!has_handler(&proc[i]) ||
367 (!errs &&
368 call_handler(&proc[i], entry.hdr, table_end))) {
369 errs++;
370 continue;
371 }
372
373 proc[i].count++;
374 break;
375 }
376 if (i != proc_num)
377 count++;
378
379 /*
380 * If entry->length is 0, break from this loop to avoid
381 * infinite loop.
382 */
383 entry_len = acpi_get_entry_length(&entry);
384 if (entry_len == 0) {
385 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
386 return -EINVAL;
387 }
388
389 entry.hdr = (union acpi_subtable_headers *)
390 ((unsigned long)entry.hdr + entry_len);
391 }
392
393 if (max_entries && count > max_entries) {
394 pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
395 id, proc->id, count);
396 }
397
398 return errs ? -EINVAL : count;
399 }
400
acpi_table_parse_entries_array(char * id,unsigned long table_size,struct acpi_subtable_proc * proc,int proc_num,unsigned int max_entries)401 int __init_or_acpilib acpi_table_parse_entries_array(
402 char *id, unsigned long table_size, struct acpi_subtable_proc *proc,
403 int proc_num, unsigned int max_entries)
404 {
405 struct acpi_table_header *table_header = NULL;
406 int count;
407 u32 instance = 0;
408
409 if (acpi_disabled)
410 return -ENODEV;
411
412 if (!id)
413 return -EINVAL;
414
415 if (!table_size)
416 return -EINVAL;
417
418 if (!strncmp(id, ACPI_SIG_MADT, 4))
419 instance = acpi_apic_instance;
420
421 acpi_get_table(id, instance, &table_header);
422 if (!table_header) {
423 pr_debug("%4.4s not present\n", id);
424 return -ENODEV;
425 }
426
427 count = acpi_parse_entries_array(id, table_size, table_header,
428 proc, proc_num, max_entries);
429
430 acpi_put_table(table_header);
431 return count;
432 }
433
__acpi_table_parse_entries(char * id,unsigned long table_size,int entry_id,acpi_tbl_entry_handler handler,acpi_tbl_entry_handler_arg handler_arg,void * arg,unsigned int max_entries)434 static int __init_or_acpilib __acpi_table_parse_entries(
435 char *id, unsigned long table_size, int entry_id,
436 acpi_tbl_entry_handler handler, acpi_tbl_entry_handler_arg handler_arg,
437 void *arg, unsigned int max_entries)
438 {
439 struct acpi_subtable_proc proc = {
440 .id = entry_id,
441 .handler = handler,
442 .handler_arg = handler_arg,
443 .arg = arg,
444 };
445
446 return acpi_table_parse_entries_array(id, table_size, &proc, 1,
447 max_entries);
448 }
449
450 int __init_or_acpilib
acpi_table_parse_cedt(enum acpi_cedt_type id,acpi_tbl_entry_handler_arg handler_arg,void * arg)451 acpi_table_parse_cedt(enum acpi_cedt_type id,
452 acpi_tbl_entry_handler_arg handler_arg, void *arg)
453 {
454 return __acpi_table_parse_entries(ACPI_SIG_CEDT,
455 sizeof(struct acpi_table_cedt), id,
456 NULL, handler_arg, arg, 0);
457 }
458 EXPORT_SYMBOL_ACPI_LIB(acpi_table_parse_cedt);
459
acpi_table_parse_entries(char * id,unsigned long table_size,int entry_id,acpi_tbl_entry_handler handler,unsigned int max_entries)460 int __init acpi_table_parse_entries(char *id, unsigned long table_size,
461 int entry_id,
462 acpi_tbl_entry_handler handler,
463 unsigned int max_entries)
464 {
465 return __acpi_table_parse_entries(id, table_size, entry_id, handler,
466 NULL, NULL, max_entries);
467 }
468
acpi_table_parse_madt(enum acpi_madt_type id,acpi_tbl_entry_handler handler,unsigned int max_entries)469 int __init acpi_table_parse_madt(enum acpi_madt_type id,
470 acpi_tbl_entry_handler handler, unsigned int max_entries)
471 {
472 return acpi_table_parse_entries(ACPI_SIG_MADT,
473 sizeof(struct acpi_table_madt), id,
474 handler, max_entries);
475 }
476
477 /**
478 * acpi_table_parse - find table with @id, run @handler on it
479 * @id: table id to find
480 * @handler: handler to run
481 *
482 * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
483 * run @handler on it.
484 *
485 * Return 0 if table found, -errno if not.
486 */
acpi_table_parse(char * id,acpi_tbl_table_handler handler)487 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
488 {
489 struct acpi_table_header *table = NULL;
490
491 if (acpi_disabled)
492 return -ENODEV;
493
494 if (!id || !handler)
495 return -EINVAL;
496
497 if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
498 acpi_get_table(id, acpi_apic_instance, &table);
499 else
500 acpi_get_table(id, 0, &table);
501
502 if (table) {
503 handler(table);
504 acpi_put_table(table);
505 return 0;
506 } else
507 return -ENODEV;
508 }
509
510 /*
511 * The BIOS is supposed to supply a single APIC/MADT,
512 * but some report two. Provide a knob to use either.
513 * (don't you wish instance 0 and 1 were not the same?)
514 */
check_multiple_madt(void)515 static void __init check_multiple_madt(void)
516 {
517 struct acpi_table_header *table = NULL;
518
519 acpi_get_table(ACPI_SIG_MADT, 2, &table);
520 if (table) {
521 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
522 acpi_apic_instance);
523 pr_warn("If \"acpi_apic_instance=%d\" works better, "
524 "notify linux-acpi@vger.kernel.org\n",
525 acpi_apic_instance ? 0 : 2);
526 acpi_put_table(table);
527
528 } else
529 acpi_apic_instance = 0;
530
531 return;
532 }
533
acpi_table_taint(struct acpi_table_header * table)534 static void acpi_table_taint(struct acpi_table_header *table)
535 {
536 pr_warn("Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
537 table->signature, table->oem_table_id);
538 add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
539 }
540
541 #ifdef CONFIG_ACPI_TABLE_UPGRADE
542 static u64 acpi_tables_addr;
543 static int all_tables_size;
544
545 /* Copied from acpica/tbutils.c:acpi_tb_checksum() */
acpi_table_checksum(u8 * buffer,u32 length)546 static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
547 {
548 u8 sum = 0;
549 u8 *end = buffer + length;
550
551 while (buffer < end)
552 sum = (u8) (sum + *(buffer++));
553 return sum;
554 }
555
556 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
557 static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
558 ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
559 ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
560 ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
561 ACPI_SIG_ASF, ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
562 ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
563 ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
564 ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
565 ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
566 ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
567 ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
568 ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI,
569 ACPI_SIG_NBFT };
570
571 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
572
573 #define NR_ACPI_INITRD_TABLES 64
574 static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES];
575 static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
576
577 #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
578
acpi_table_upgrade(void)579 void __init acpi_table_upgrade(void)
580 {
581 void *data;
582 size_t size;
583 int sig, no, table_nr = 0, total_offset = 0;
584 long offset = 0;
585 struct acpi_table_header *table;
586 char cpio_path[32] = "kernel/firmware/acpi/";
587 struct cpio_data file;
588
589 if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
590 data = __initramfs_start;
591 size = __initramfs_size;
592 } else {
593 data = (void *)initrd_start;
594 size = initrd_end - initrd_start;
595 }
596
597 if (data == NULL || size == 0)
598 return;
599
600 for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) {
601 file = find_cpio_data(cpio_path, data, size, &offset);
602 if (!file.data)
603 break;
604
605 data += offset;
606 size -= offset;
607
608 if (file.size < sizeof(struct acpi_table_header)) {
609 pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
610 cpio_path, file.name);
611 continue;
612 }
613
614 table = file.data;
615
616 for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
617 if (!memcmp(table->signature, table_sigs[sig], 4))
618 break;
619
620 if (sig >= ARRAY_SIZE(table_sigs)) {
621 pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
622 cpio_path, file.name);
623 continue;
624 }
625 if (file.size != table->length) {
626 pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
627 cpio_path, file.name);
628 continue;
629 }
630 if (acpi_table_checksum(file.data, table->length)) {
631 pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
632 cpio_path, file.name);
633 continue;
634 }
635
636 pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
637 table->signature, cpio_path, file.name, table->length);
638
639 all_tables_size += table->length;
640 acpi_initrd_files[table_nr].data = file.data;
641 acpi_initrd_files[table_nr].size = file.size;
642 table_nr++;
643 }
644 if (table_nr == 0)
645 return;
646
647 if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
648 pr_notice("kernel is locked down, ignoring table override\n");
649 return;
650 }
651
652 acpi_tables_addr =
653 memblock_phys_alloc_range(all_tables_size, PAGE_SIZE,
654 0, ACPI_TABLE_UPGRADE_MAX_PHYS);
655 if (!acpi_tables_addr) {
656 WARN_ON(1);
657 return;
658 }
659 /*
660 * Only calling e820_add_reserve does not work and the
661 * tables are invalid (memory got used) later.
662 * memblock_reserve works as expected and the tables won't get modified.
663 * But it's not enough on X86 because ioremap will
664 * complain later (used by acpi_os_map_memory) that the pages
665 * that should get mapped are not marked "reserved".
666 * Both memblock_reserve and e820__range_add (via arch_reserve_mem_area)
667 * works fine.
668 */
669 arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
670
671 kmemleak_ignore_phys(acpi_tables_addr);
672
673 /*
674 * early_ioremap only can remap 256k one time. If we map all
675 * tables one time, we will hit the limit. Need to map chunks
676 * one by one during copying the same as that in relocate_initrd().
677 */
678 for (no = 0; no < table_nr; no++) {
679 unsigned char *src_p = acpi_initrd_files[no].data;
680 phys_addr_t size = acpi_initrd_files[no].size;
681 phys_addr_t dest_addr = acpi_tables_addr + total_offset;
682 phys_addr_t slop, clen;
683 char *dest_p;
684
685 total_offset += size;
686
687 while (size) {
688 slop = dest_addr & ~PAGE_MASK;
689 clen = size;
690 if (clen > MAP_CHUNK_SIZE - slop)
691 clen = MAP_CHUNK_SIZE - slop;
692 dest_p = early_memremap(dest_addr & PAGE_MASK,
693 clen + slop);
694 memcpy(dest_p + slop, src_p, clen);
695 early_memunmap(dest_p, clen + slop);
696 src_p += clen;
697 dest_addr += clen;
698 size -= clen;
699 }
700 }
701 }
702
703 static acpi_status
acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * length)704 acpi_table_initrd_override(struct acpi_table_header *existing_table,
705 acpi_physical_address *address, u32 *length)
706 {
707 int table_offset = 0;
708 int table_index = 0;
709 struct acpi_table_header *table;
710 u32 table_length;
711
712 *length = 0;
713 *address = 0;
714 if (!acpi_tables_addr)
715 return AE_OK;
716
717 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
718 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
719 ACPI_HEADER_SIZE);
720 if (table_offset + table->length > all_tables_size) {
721 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
722 WARN_ON(1);
723 return AE_OK;
724 }
725
726 table_length = table->length;
727
728 /* Only override tables matched */
729 if (memcmp(existing_table->signature, table->signature, 4) ||
730 memcmp(table->oem_id, existing_table->oem_id,
731 ACPI_OEM_ID_SIZE) ||
732 memcmp(table->oem_table_id, existing_table->oem_table_id,
733 ACPI_OEM_TABLE_ID_SIZE)) {
734 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
735 goto next_table;
736 }
737 /*
738 * Mark the table to avoid being used in
739 * acpi_table_initrd_scan() and check the revision.
740 */
741 if (test_and_set_bit(table_index, acpi_initrd_installed) ||
742 existing_table->oem_revision >= table->oem_revision) {
743 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
744 goto next_table;
745 }
746
747 *length = table_length;
748 *address = acpi_tables_addr + table_offset;
749 pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n",
750 table->signature, table->oem_id,
751 table->oem_table_id);
752 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
753 break;
754
755 next_table:
756 table_offset += table_length;
757 table_index++;
758 }
759 return AE_OK;
760 }
761
acpi_table_initrd_scan(void)762 static void __init acpi_table_initrd_scan(void)
763 {
764 int table_offset = 0;
765 int table_index = 0;
766 u32 table_length;
767 struct acpi_table_header *table;
768
769 if (!acpi_tables_addr)
770 return;
771
772 while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
773 table = acpi_os_map_memory(acpi_tables_addr + table_offset,
774 ACPI_HEADER_SIZE);
775 if (table_offset + table->length > all_tables_size) {
776 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
777 WARN_ON(1);
778 return;
779 }
780
781 table_length = table->length;
782
783 /* Skip RSDT/XSDT which should only be used for override */
784 if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
785 ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
786 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
787 goto next_table;
788 }
789 /*
790 * Mark the table to avoid being used in
791 * acpi_table_initrd_override(). Though this is not possible
792 * because override is disabled in acpi_install_physical_table().
793 */
794 if (test_and_set_bit(table_index, acpi_initrd_installed)) {
795 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
796 goto next_table;
797 }
798
799 pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n",
800 table->signature, table->oem_id,
801 table->oem_table_id);
802 acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
803 acpi_install_physical_table(acpi_tables_addr + table_offset);
804 next_table:
805 table_offset += table_length;
806 table_index++;
807 }
808 }
809 #else
810 static acpi_status
acpi_table_initrd_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)811 acpi_table_initrd_override(struct acpi_table_header *existing_table,
812 acpi_physical_address *address,
813 u32 *table_length)
814 {
815 *table_length = 0;
816 *address = 0;
817 return AE_OK;
818 }
819
acpi_table_initrd_scan(void)820 static void __init acpi_table_initrd_scan(void)
821 {
822 }
823 #endif /* CONFIG_ACPI_TABLE_UPGRADE */
824
825 acpi_status
acpi_os_physical_table_override(struct acpi_table_header * existing_table,acpi_physical_address * address,u32 * table_length)826 acpi_os_physical_table_override(struct acpi_table_header *existing_table,
827 acpi_physical_address *address,
828 u32 *table_length)
829 {
830 return acpi_table_initrd_override(existing_table, address,
831 table_length);
832 }
833
834 #ifdef CONFIG_ACPI_CUSTOM_DSDT
835 static void *amlcode __attribute__ ((weakref("AmlCode")));
836 static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
837 #endif
838
acpi_os_table_override(struct acpi_table_header * existing_table,struct acpi_table_header ** new_table)839 acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
840 struct acpi_table_header **new_table)
841 {
842 if (!existing_table || !new_table)
843 return AE_BAD_PARAMETER;
844
845 *new_table = NULL;
846
847 #ifdef CONFIG_ACPI_CUSTOM_DSDT
848 if (!strncmp(existing_table->signature, "DSDT", 4)) {
849 *new_table = (struct acpi_table_header *)&amlcode;
850 if (!(*new_table))
851 *new_table = (struct acpi_table_header *)&dsdt_amlcode;
852 }
853 #endif
854 if (*new_table != NULL)
855 acpi_table_taint(existing_table);
856 return AE_OK;
857 }
858
859 /*
860 * acpi_locate_initial_tables()
861 *
862 * Get the RSDP, then find and checksum all the ACPI tables.
863 *
864 * result: initial_tables[] is initialized, and points to
865 * a list of ACPI tables.
866 */
acpi_locate_initial_tables(void)867 int __init acpi_locate_initial_tables(void)
868 {
869 acpi_status status;
870
871 if (acpi_verify_table_checksum) {
872 pr_info("Early table checksum verification enabled\n");
873 acpi_gbl_enable_table_validation = TRUE;
874 } else {
875 pr_info("Early table checksum verification disabled\n");
876 acpi_gbl_enable_table_validation = FALSE;
877 }
878
879 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
880 if (ACPI_FAILURE(status))
881 return -EINVAL;
882
883 return 0;
884 }
885
acpi_reserve_initial_tables(void)886 void __init acpi_reserve_initial_tables(void)
887 {
888 int i;
889
890 for (i = 0; i < ACPI_MAX_TABLES; i++) {
891 struct acpi_table_desc *table_desc = &initial_tables[i];
892 u64 start = table_desc->address;
893 u64 size = table_desc->length;
894
895 if (!start || !size)
896 break;
897
898 pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n",
899 table_desc->signature.ascii, start, start + size - 1);
900
901 memblock_reserve(start, size);
902 }
903 }
904
acpi_table_init_complete(void)905 void __init acpi_table_init_complete(void)
906 {
907 acpi_table_initrd_scan();
908 check_multiple_madt();
909 }
910
acpi_table_init(void)911 int __init acpi_table_init(void)
912 {
913 int ret;
914
915 ret = acpi_locate_initial_tables();
916 if (ret)
917 return ret;
918
919 acpi_table_init_complete();
920
921 return 0;
922 }
923
acpi_parse_apic_instance(char * str)924 static int __init acpi_parse_apic_instance(char *str)
925 {
926 if (!str)
927 return -EINVAL;
928
929 if (kstrtoint(str, 0, &acpi_apic_instance))
930 return -EINVAL;
931
932 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
933
934 return 0;
935 }
936 early_param("acpi_apic_instance", acpi_parse_apic_instance);
937
acpi_force_table_verification_setup(char * s)938 static int __init acpi_force_table_verification_setup(char *s)
939 {
940 acpi_verify_table_checksum = true;
941
942 return 0;
943 }
944 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
945
acpi_force_32bit_fadt_addr(char * s)946 static int __init acpi_force_32bit_fadt_addr(char *s)
947 {
948 pr_info("Forcing 32 Bit FADT addresses\n");
949 acpi_gbl_use32_bit_fadt_addresses = TRUE;
950
951 return 0;
952 }
953 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);
954