1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * apei-base.c - ACPI Platform Error Interface (APEI) supporting |
4 | * infrastructure |
5 | * |
6 | * APEI allows to report errors (for example from the chipset) to |
7 | * the operating system. This improves NMI handling especially. In |
8 | * addition it supports error serialization and error injection. |
9 | * |
10 | * For more information about APEI, please refer to ACPI Specification |
11 | * version 4.0, chapter 17. |
12 | * |
13 | * This file has Common functions used by more than one APEI table, |
14 | * including framework of interpreter for ERST and EINJ; resource |
15 | * management for APEI registers. |
16 | * |
17 | * Copyright (C) 2009, Intel Corp. |
18 | * Author: Huang Ying <ying.huang@intel.com> |
19 | */ |
20 | |
21 | #include <linux/kernel.h> |
22 | #include <linux/module.h> |
23 | #include <linux/init.h> |
24 | #include <linux/acpi.h> |
25 | #include <linux/slab.h> |
26 | #include <linux/io.h> |
27 | #include <linux/kref.h> |
28 | #include <linux/interrupt.h> |
29 | #include <linux/debugfs.h> |
30 | #include <acpi/apei.h> |
31 | #include <asm/unaligned.h> |
32 | |
33 | #include "apei-internal.h" |
34 | |
35 | #define APEI_PFX "APEI: " |
36 | |
37 | /* |
38 | * APEI ERST (Error Record Serialization Table) and EINJ (Error |
39 | * INJection) interpreter framework. |
40 | */ |
41 | |
42 | #define APEI_EXEC_PRESERVE_REGISTER 0x1 |
43 | |
44 | void apei_exec_ctx_init(struct apei_exec_context *ctx, |
45 | struct apei_exec_ins_type *ins_table, |
46 | u32 instructions, |
47 | struct acpi_whea_header *action_table, |
48 | u32 entries) |
49 | { |
50 | ctx->ins_table = ins_table; |
51 | ctx->instructions = instructions; |
52 | ctx->action_table = action_table; |
53 | ctx->entries = entries; |
54 | } |
55 | EXPORT_SYMBOL_GPL(apei_exec_ctx_init); |
56 | |
57 | int __apei_exec_read_register(struct acpi_whea_header *entry, u64 *val) |
58 | { |
59 | int rc; |
60 | |
61 | rc = apei_read(val, reg: &entry->register_region); |
62 | if (rc) |
63 | return rc; |
64 | *val >>= entry->register_region.bit_offset; |
65 | *val &= entry->mask; |
66 | |
67 | return 0; |
68 | } |
69 | |
70 | int apei_exec_read_register(struct apei_exec_context *ctx, |
71 | struct acpi_whea_header *entry) |
72 | { |
73 | int rc; |
74 | u64 val = 0; |
75 | |
76 | rc = __apei_exec_read_register(entry, val: &val); |
77 | if (rc) |
78 | return rc; |
79 | ctx->value = val; |
80 | |
81 | return 0; |
82 | } |
83 | EXPORT_SYMBOL_GPL(apei_exec_read_register); |
84 | |
85 | int apei_exec_read_register_value(struct apei_exec_context *ctx, |
86 | struct acpi_whea_header *entry) |
87 | { |
88 | int rc; |
89 | |
90 | rc = apei_exec_read_register(ctx, entry); |
91 | if (rc) |
92 | return rc; |
93 | ctx->value = (ctx->value == entry->value); |
94 | |
95 | return 0; |
96 | } |
97 | EXPORT_SYMBOL_GPL(apei_exec_read_register_value); |
98 | |
99 | int __apei_exec_write_register(struct acpi_whea_header *entry, u64 val) |
100 | { |
101 | int rc; |
102 | |
103 | val &= entry->mask; |
104 | val <<= entry->register_region.bit_offset; |
105 | if (entry->flags & APEI_EXEC_PRESERVE_REGISTER) { |
106 | u64 valr = 0; |
107 | rc = apei_read(val: &valr, reg: &entry->register_region); |
108 | if (rc) |
109 | return rc; |
110 | valr &= ~(entry->mask << entry->register_region.bit_offset); |
111 | val |= valr; |
112 | } |
113 | rc = apei_write(val, reg: &entry->register_region); |
114 | |
115 | return rc; |
116 | } |
117 | |
118 | int apei_exec_write_register(struct apei_exec_context *ctx, |
119 | struct acpi_whea_header *entry) |
120 | { |
121 | return __apei_exec_write_register(entry, val: ctx->value); |
122 | } |
123 | EXPORT_SYMBOL_GPL(apei_exec_write_register); |
124 | |
125 | int apei_exec_write_register_value(struct apei_exec_context *ctx, |
126 | struct acpi_whea_header *entry) |
127 | { |
128 | ctx->value = entry->value; |
129 | |
130 | return apei_exec_write_register(ctx, entry); |
131 | } |
132 | EXPORT_SYMBOL_GPL(apei_exec_write_register_value); |
133 | |
134 | int apei_exec_noop(struct apei_exec_context *ctx, |
135 | struct acpi_whea_header *entry) |
136 | { |
137 | return 0; |
138 | } |
139 | EXPORT_SYMBOL_GPL(apei_exec_noop); |
140 | |
141 | /* |
142 | * Interpret the specified action. Go through whole action table, |
143 | * execute all instructions belong to the action. |
144 | */ |
145 | int __apei_exec_run(struct apei_exec_context *ctx, u8 action, |
146 | bool optional) |
147 | { |
148 | int rc = -ENOENT; |
149 | u32 i, ip; |
150 | struct acpi_whea_header *entry; |
151 | apei_exec_ins_func_t run; |
152 | |
153 | ctx->ip = 0; |
154 | |
155 | /* |
156 | * "ip" is the instruction pointer of current instruction, |
157 | * "ctx->ip" specifies the next instruction to executed, |
158 | * instruction "run" function may change the "ctx->ip" to |
159 | * implement "goto" semantics. |
160 | */ |
161 | rewind: |
162 | ip = 0; |
163 | for (i = 0; i < ctx->entries; i++) { |
164 | entry = &ctx->action_table[i]; |
165 | if (entry->action != action) |
166 | continue; |
167 | if (ip == ctx->ip) { |
168 | if (entry->instruction >= ctx->instructions || |
169 | !ctx->ins_table[entry->instruction].run) { |
170 | pr_warn(FW_WARN APEI_PFX |
171 | "Invalid action table, unknown instruction type: %d\n" , |
172 | entry->instruction); |
173 | return -EINVAL; |
174 | } |
175 | run = ctx->ins_table[entry->instruction].run; |
176 | rc = run(ctx, entry); |
177 | if (rc < 0) |
178 | return rc; |
179 | else if (rc != APEI_EXEC_SET_IP) |
180 | ctx->ip++; |
181 | } |
182 | ip++; |
183 | if (ctx->ip < ip) |
184 | goto rewind; |
185 | } |
186 | |
187 | return !optional && rc < 0 ? rc : 0; |
188 | } |
189 | EXPORT_SYMBOL_GPL(__apei_exec_run); |
190 | |
191 | typedef int (*apei_exec_entry_func_t)(struct apei_exec_context *ctx, |
192 | struct acpi_whea_header *entry, |
193 | void *data); |
194 | |
195 | static int apei_exec_for_each_entry(struct apei_exec_context *ctx, |
196 | apei_exec_entry_func_t func, |
197 | void *data, |
198 | int *end) |
199 | { |
200 | u8 ins; |
201 | int i, rc; |
202 | struct acpi_whea_header *entry; |
203 | struct apei_exec_ins_type *ins_table = ctx->ins_table; |
204 | |
205 | for (i = 0; i < ctx->entries; i++) { |
206 | entry = ctx->action_table + i; |
207 | ins = entry->instruction; |
208 | if (end) |
209 | *end = i; |
210 | if (ins >= ctx->instructions || !ins_table[ins].run) { |
211 | pr_warn(FW_WARN APEI_PFX |
212 | "Invalid action table, unknown instruction type: %d\n" , |
213 | ins); |
214 | return -EINVAL; |
215 | } |
216 | rc = func(ctx, entry, data); |
217 | if (rc) |
218 | return rc; |
219 | } |
220 | |
221 | return 0; |
222 | } |
223 | |
224 | static int pre_map_gar_callback(struct apei_exec_context *ctx, |
225 | struct acpi_whea_header *entry, |
226 | void *data) |
227 | { |
228 | u8 ins = entry->instruction; |
229 | |
230 | if (ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER) |
231 | return apei_map_generic_address(reg: &entry->register_region); |
232 | |
233 | return 0; |
234 | } |
235 | |
236 | /* |
237 | * Pre-map all GARs in action table to make it possible to access them |
238 | * in NMI handler. |
239 | */ |
240 | int apei_exec_pre_map_gars(struct apei_exec_context *ctx) |
241 | { |
242 | int rc, end; |
243 | |
244 | rc = apei_exec_for_each_entry(ctx, func: pre_map_gar_callback, |
245 | NULL, end: &end); |
246 | if (rc) { |
247 | struct apei_exec_context ctx_unmap; |
248 | memcpy(&ctx_unmap, ctx, sizeof(*ctx)); |
249 | ctx_unmap.entries = end; |
250 | apei_exec_post_unmap_gars(ctx: &ctx_unmap); |
251 | } |
252 | |
253 | return rc; |
254 | } |
255 | EXPORT_SYMBOL_GPL(apei_exec_pre_map_gars); |
256 | |
257 | static int post_unmap_gar_callback(struct apei_exec_context *ctx, |
258 | struct acpi_whea_header *entry, |
259 | void *data) |
260 | { |
261 | u8 ins = entry->instruction; |
262 | |
263 | if (ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER) |
264 | apei_unmap_generic_address(reg: &entry->register_region); |
265 | |
266 | return 0; |
267 | } |
268 | |
269 | /* Post-unmap all GAR in action table. */ |
270 | int apei_exec_post_unmap_gars(struct apei_exec_context *ctx) |
271 | { |
272 | return apei_exec_for_each_entry(ctx, func: post_unmap_gar_callback, |
273 | NULL, NULL); |
274 | } |
275 | EXPORT_SYMBOL_GPL(apei_exec_post_unmap_gars); |
276 | |
277 | /* |
278 | * Resource management for GARs in APEI |
279 | */ |
280 | struct apei_res { |
281 | struct list_head list; |
282 | unsigned long start; |
283 | unsigned long end; |
284 | }; |
285 | |
286 | /* Collect all resources requested, to avoid conflict */ |
287 | static struct apei_resources apei_resources_all = { |
288 | .iomem = LIST_HEAD_INIT(apei_resources_all.iomem), |
289 | .ioport = LIST_HEAD_INIT(apei_resources_all.ioport), |
290 | }; |
291 | |
292 | static int apei_res_add(struct list_head *res_list, |
293 | unsigned long start, unsigned long size) |
294 | { |
295 | struct apei_res *res, *resn, *res_ins = NULL; |
296 | unsigned long end = start + size; |
297 | |
298 | if (end <= start) |
299 | return 0; |
300 | repeat: |
301 | list_for_each_entry_safe(res, resn, res_list, list) { |
302 | if (res->start > end || res->end < start) |
303 | continue; |
304 | else if (end <= res->end && start >= res->start) { |
305 | kfree(objp: res_ins); |
306 | return 0; |
307 | } |
308 | list_del(entry: &res->list); |
309 | res->start = start = min(res->start, start); |
310 | res->end = end = max(res->end, end); |
311 | kfree(objp: res_ins); |
312 | res_ins = res; |
313 | goto repeat; |
314 | } |
315 | |
316 | if (res_ins) |
317 | list_add(new: &res_ins->list, head: res_list); |
318 | else { |
319 | res_ins = kmalloc(size: sizeof(*res_ins), GFP_KERNEL); |
320 | if (!res_ins) |
321 | return -ENOMEM; |
322 | res_ins->start = start; |
323 | res_ins->end = end; |
324 | list_add(new: &res_ins->list, head: res_list); |
325 | } |
326 | |
327 | return 0; |
328 | } |
329 | |
330 | static int apei_res_sub(struct list_head *res_list1, |
331 | struct list_head *res_list2) |
332 | { |
333 | struct apei_res *res1, *resn1, *res2, *res; |
334 | res1 = list_entry(res_list1->next, struct apei_res, list); |
335 | resn1 = list_entry(res1->list.next, struct apei_res, list); |
336 | while (&res1->list != res_list1) { |
337 | list_for_each_entry(res2, res_list2, list) { |
338 | if (res1->start >= res2->end || |
339 | res1->end <= res2->start) |
340 | continue; |
341 | else if (res1->end <= res2->end && |
342 | res1->start >= res2->start) { |
343 | list_del(entry: &res1->list); |
344 | kfree(objp: res1); |
345 | break; |
346 | } else if (res1->end > res2->end && |
347 | res1->start < res2->start) { |
348 | res = kmalloc(size: sizeof(*res), GFP_KERNEL); |
349 | if (!res) |
350 | return -ENOMEM; |
351 | res->start = res2->end; |
352 | res->end = res1->end; |
353 | res1->end = res2->start; |
354 | list_add(new: &res->list, head: &res1->list); |
355 | resn1 = res; |
356 | } else { |
357 | if (res1->start < res2->start) |
358 | res1->end = res2->start; |
359 | else |
360 | res1->start = res2->end; |
361 | } |
362 | } |
363 | res1 = resn1; |
364 | resn1 = list_entry(resn1->list.next, struct apei_res, list); |
365 | } |
366 | |
367 | return 0; |
368 | } |
369 | |
370 | static void apei_res_clean(struct list_head *res_list) |
371 | { |
372 | struct apei_res *res, *resn; |
373 | |
374 | list_for_each_entry_safe(res, resn, res_list, list) { |
375 | list_del(entry: &res->list); |
376 | kfree(objp: res); |
377 | } |
378 | } |
379 | |
380 | void apei_resources_fini(struct apei_resources *resources) |
381 | { |
382 | apei_res_clean(res_list: &resources->iomem); |
383 | apei_res_clean(res_list: &resources->ioport); |
384 | } |
385 | EXPORT_SYMBOL_GPL(apei_resources_fini); |
386 | |
387 | static int apei_resources_merge(struct apei_resources *resources1, |
388 | struct apei_resources *resources2) |
389 | { |
390 | int rc; |
391 | struct apei_res *res; |
392 | |
393 | list_for_each_entry(res, &resources2->iomem, list) { |
394 | rc = apei_res_add(res_list: &resources1->iomem, start: res->start, |
395 | size: res->end - res->start); |
396 | if (rc) |
397 | return rc; |
398 | } |
399 | list_for_each_entry(res, &resources2->ioport, list) { |
400 | rc = apei_res_add(res_list: &resources1->ioport, start: res->start, |
401 | size: res->end - res->start); |
402 | if (rc) |
403 | return rc; |
404 | } |
405 | |
406 | return 0; |
407 | } |
408 | |
409 | int apei_resources_add(struct apei_resources *resources, |
410 | unsigned long start, unsigned long size, |
411 | bool iomem) |
412 | { |
413 | if (iomem) |
414 | return apei_res_add(res_list: &resources->iomem, start, size); |
415 | else |
416 | return apei_res_add(res_list: &resources->ioport, start, size); |
417 | } |
418 | EXPORT_SYMBOL_GPL(apei_resources_add); |
419 | |
420 | /* |
421 | * EINJ has two groups of GARs (EINJ table entry and trigger table |
422 | * entry), so common resources are subtracted from the trigger table |
423 | * resources before the second requesting. |
424 | */ |
425 | int apei_resources_sub(struct apei_resources *resources1, |
426 | struct apei_resources *resources2) |
427 | { |
428 | int rc; |
429 | |
430 | rc = apei_res_sub(res_list1: &resources1->iomem, res_list2: &resources2->iomem); |
431 | if (rc) |
432 | return rc; |
433 | return apei_res_sub(res_list1: &resources1->ioport, res_list2: &resources2->ioport); |
434 | } |
435 | EXPORT_SYMBOL_GPL(apei_resources_sub); |
436 | |
437 | static int apei_get_res_callback(__u64 start, __u64 size, void *data) |
438 | { |
439 | struct apei_resources *resources = data; |
440 | return apei_res_add(res_list: &resources->iomem, start, size); |
441 | } |
442 | |
443 | static int apei_get_nvs_resources(struct apei_resources *resources) |
444 | { |
445 | return acpi_nvs_for_each_region(func: apei_get_res_callback, data: resources); |
446 | } |
447 | |
448 | int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size, |
449 | void *data), void *data); |
450 | static int apei_get_arch_resources(struct apei_resources *resources) |
451 | |
452 | { |
453 | return arch_apei_filter_addr(apei_get_res_callback, resources); |
454 | } |
455 | |
456 | /* |
457 | * IO memory/port resource management mechanism is used to check |
458 | * whether memory/port area used by GARs conflicts with normal memory |
459 | * or IO memory/port of devices. |
460 | */ |
461 | int apei_resources_request(struct apei_resources *resources, |
462 | const char *desc) |
463 | { |
464 | struct apei_res *res, *res_bak = NULL; |
465 | struct resource *r; |
466 | struct apei_resources nvs_resources, arch_res; |
467 | int rc; |
468 | |
469 | rc = apei_resources_sub(resources, &apei_resources_all); |
470 | if (rc) |
471 | return rc; |
472 | |
473 | /* |
474 | * Some firmware uses ACPI NVS region, that has been marked as |
475 | * busy, so exclude it from APEI resources to avoid false |
476 | * conflict. |
477 | */ |
478 | apei_resources_init(resources: &nvs_resources); |
479 | rc = apei_get_nvs_resources(resources: &nvs_resources); |
480 | if (rc) |
481 | goto nvs_res_fini; |
482 | rc = apei_resources_sub(resources, &nvs_resources); |
483 | if (rc) |
484 | goto nvs_res_fini; |
485 | |
486 | if (arch_apei_filter_addr) { |
487 | apei_resources_init(resources: &arch_res); |
488 | rc = apei_get_arch_resources(resources: &arch_res); |
489 | if (rc) |
490 | goto arch_res_fini; |
491 | rc = apei_resources_sub(resources, &arch_res); |
492 | if (rc) |
493 | goto arch_res_fini; |
494 | } |
495 | |
496 | rc = -EINVAL; |
497 | list_for_each_entry(res, &resources->iomem, list) { |
498 | r = request_mem_region(res->start, res->end - res->start, |
499 | desc); |
500 | if (!r) { |
501 | pr_err(APEI_PFX |
502 | "Can not request [mem %#010llx-%#010llx] for %s registers\n" , |
503 | (unsigned long long)res->start, |
504 | (unsigned long long)res->end - 1, desc); |
505 | res_bak = res; |
506 | goto err_unmap_iomem; |
507 | } |
508 | } |
509 | |
510 | list_for_each_entry(res, &resources->ioport, list) { |
511 | r = request_region(res->start, res->end - res->start, desc); |
512 | if (!r) { |
513 | pr_err(APEI_PFX |
514 | "Can not request [io %#06llx-%#06llx] for %s registers\n" , |
515 | (unsigned long long)res->start, |
516 | (unsigned long long)res->end - 1, desc); |
517 | res_bak = res; |
518 | goto err_unmap_ioport; |
519 | } |
520 | } |
521 | |
522 | rc = apei_resources_merge(resources1: &apei_resources_all, resources2: resources); |
523 | if (rc) { |
524 | pr_err(APEI_PFX "Fail to merge resources!\n" ); |
525 | goto err_unmap_ioport; |
526 | } |
527 | |
528 | goto arch_res_fini; |
529 | |
530 | err_unmap_ioport: |
531 | list_for_each_entry(res, &resources->ioport, list) { |
532 | if (res == res_bak) |
533 | break; |
534 | release_region(res->start, res->end - res->start); |
535 | } |
536 | res_bak = NULL; |
537 | err_unmap_iomem: |
538 | list_for_each_entry(res, &resources->iomem, list) { |
539 | if (res == res_bak) |
540 | break; |
541 | release_mem_region(res->start, res->end - res->start); |
542 | } |
543 | arch_res_fini: |
544 | if (arch_apei_filter_addr) |
545 | apei_resources_fini(&arch_res); |
546 | nvs_res_fini: |
547 | apei_resources_fini(&nvs_resources); |
548 | return rc; |
549 | } |
550 | EXPORT_SYMBOL_GPL(apei_resources_request); |
551 | |
552 | void apei_resources_release(struct apei_resources *resources) |
553 | { |
554 | int rc; |
555 | struct apei_res *res; |
556 | |
557 | list_for_each_entry(res, &resources->iomem, list) |
558 | release_mem_region(res->start, res->end - res->start); |
559 | list_for_each_entry(res, &resources->ioport, list) |
560 | release_region(res->start, res->end - res->start); |
561 | |
562 | rc = apei_resources_sub(&apei_resources_all, resources); |
563 | if (rc) |
564 | pr_err(APEI_PFX "Fail to sub resources!\n" ); |
565 | } |
566 | EXPORT_SYMBOL_GPL(apei_resources_release); |
567 | |
568 | static int apei_check_gar(struct acpi_generic_address *reg, u64 *paddr, |
569 | u32 *access_bit_width) |
570 | { |
571 | u32 bit_width, bit_offset, access_size_code, space_id; |
572 | |
573 | bit_width = reg->bit_width; |
574 | bit_offset = reg->bit_offset; |
575 | access_size_code = reg->access_width; |
576 | space_id = reg->space_id; |
577 | *paddr = get_unaligned(®->address); |
578 | if (!*paddr) { |
579 | pr_warn(FW_BUG APEI_PFX |
580 | "Invalid physical address in GAR [0x%llx/%u/%u/%u/%u]\n" , |
581 | *paddr, bit_width, bit_offset, access_size_code, |
582 | space_id); |
583 | return -EINVAL; |
584 | } |
585 | |
586 | if (access_size_code < 1 || access_size_code > 4) { |
587 | pr_warn(FW_BUG APEI_PFX |
588 | "Invalid access size code in GAR [0x%llx/%u/%u/%u/%u]\n" , |
589 | *paddr, bit_width, bit_offset, access_size_code, |
590 | space_id); |
591 | return -EINVAL; |
592 | } |
593 | *access_bit_width = 1UL << (access_size_code + 2); |
594 | |
595 | /* Fixup common BIOS bug */ |
596 | if (bit_width == 32 && bit_offset == 0 && (*paddr & 0x03) == 0 && |
597 | *access_bit_width < 32) |
598 | *access_bit_width = 32; |
599 | else if (bit_width == 64 && bit_offset == 0 && (*paddr & 0x07) == 0 && |
600 | *access_bit_width < 64) |
601 | *access_bit_width = 64; |
602 | |
603 | if ((bit_width + bit_offset) > *access_bit_width) { |
604 | pr_warn(FW_BUG APEI_PFX |
605 | "Invalid bit width + offset in GAR [0x%llx/%u/%u/%u/%u]\n" , |
606 | *paddr, bit_width, bit_offset, access_size_code, |
607 | space_id); |
608 | return -EINVAL; |
609 | } |
610 | |
611 | if (space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY && |
612 | space_id != ACPI_ADR_SPACE_SYSTEM_IO) { |
613 | pr_warn(FW_BUG APEI_PFX |
614 | "Invalid address space type in GAR [0x%llx/%u/%u/%u/%u]\n" , |
615 | *paddr, bit_width, bit_offset, access_size_code, |
616 | space_id); |
617 | return -EINVAL; |
618 | } |
619 | |
620 | return 0; |
621 | } |
622 | |
623 | int apei_map_generic_address(struct acpi_generic_address *reg) |
624 | { |
625 | int rc; |
626 | u32 access_bit_width; |
627 | u64 address; |
628 | |
629 | rc = apei_check_gar(reg, paddr: &address, access_bit_width: &access_bit_width); |
630 | if (rc) |
631 | return rc; |
632 | |
633 | /* IO space doesn't need mapping */ |
634 | if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) |
635 | return 0; |
636 | |
637 | if (!acpi_os_map_generic_address(addr: reg)) |
638 | return -ENXIO; |
639 | |
640 | return 0; |
641 | } |
642 | EXPORT_SYMBOL_GPL(apei_map_generic_address); |
643 | |
644 | /* read GAR in interrupt (including NMI) or process context */ |
645 | int apei_read(u64 *val, struct acpi_generic_address *reg) |
646 | { |
647 | int rc; |
648 | u32 access_bit_width; |
649 | u64 address; |
650 | acpi_status status; |
651 | |
652 | rc = apei_check_gar(reg, paddr: &address, access_bit_width: &access_bit_width); |
653 | if (rc) |
654 | return rc; |
655 | |
656 | *val = 0; |
657 | switch(reg->space_id) { |
658 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: |
659 | status = acpi_os_read_memory(address: (acpi_physical_address) address, |
660 | value: val, width: access_bit_width); |
661 | if (ACPI_FAILURE(status)) |
662 | return -EIO; |
663 | break; |
664 | case ACPI_ADR_SPACE_SYSTEM_IO: |
665 | status = acpi_os_read_port(address, value: (u32 *)val, |
666 | width: access_bit_width); |
667 | if (ACPI_FAILURE(status)) |
668 | return -EIO; |
669 | break; |
670 | default: |
671 | return -EINVAL; |
672 | } |
673 | |
674 | return 0; |
675 | } |
676 | EXPORT_SYMBOL_GPL(apei_read); |
677 | |
678 | /* write GAR in interrupt (including NMI) or process context */ |
679 | int apei_write(u64 val, struct acpi_generic_address *reg) |
680 | { |
681 | int rc; |
682 | u32 access_bit_width; |
683 | u64 address; |
684 | acpi_status status; |
685 | |
686 | rc = apei_check_gar(reg, paddr: &address, access_bit_width: &access_bit_width); |
687 | if (rc) |
688 | return rc; |
689 | |
690 | switch (reg->space_id) { |
691 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: |
692 | status = acpi_os_write_memory(address: (acpi_physical_address) address, |
693 | value: val, width: access_bit_width); |
694 | if (ACPI_FAILURE(status)) |
695 | return -EIO; |
696 | break; |
697 | case ACPI_ADR_SPACE_SYSTEM_IO: |
698 | status = acpi_os_write_port(address, value: val, width: access_bit_width); |
699 | if (ACPI_FAILURE(status)) |
700 | return -EIO; |
701 | break; |
702 | default: |
703 | return -EINVAL; |
704 | } |
705 | |
706 | return 0; |
707 | } |
708 | EXPORT_SYMBOL_GPL(apei_write); |
709 | |
710 | static int collect_res_callback(struct apei_exec_context *ctx, |
711 | struct acpi_whea_header *entry, |
712 | void *data) |
713 | { |
714 | struct apei_resources *resources = data; |
715 | struct acpi_generic_address *reg = &entry->register_region; |
716 | u8 ins = entry->instruction; |
717 | u32 access_bit_width; |
718 | u64 paddr; |
719 | int rc; |
720 | |
721 | if (!(ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER)) |
722 | return 0; |
723 | |
724 | rc = apei_check_gar(reg, paddr: &paddr, access_bit_width: &access_bit_width); |
725 | if (rc) |
726 | return rc; |
727 | |
728 | switch (reg->space_id) { |
729 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: |
730 | return apei_res_add(res_list: &resources->iomem, start: paddr, |
731 | size: access_bit_width / 8); |
732 | case ACPI_ADR_SPACE_SYSTEM_IO: |
733 | return apei_res_add(res_list: &resources->ioport, start: paddr, |
734 | size: access_bit_width / 8); |
735 | default: |
736 | return -EINVAL; |
737 | } |
738 | } |
739 | |
740 | /* |
741 | * Same register may be used by multiple instructions in GARs, so |
742 | * resources are collected before requesting. |
743 | */ |
744 | int apei_exec_collect_resources(struct apei_exec_context *ctx, |
745 | struct apei_resources *resources) |
746 | { |
747 | return apei_exec_for_each_entry(ctx, func: collect_res_callback, |
748 | data: resources, NULL); |
749 | } |
750 | EXPORT_SYMBOL_GPL(apei_exec_collect_resources); |
751 | |
752 | struct dentry *apei_get_debugfs_dir(void) |
753 | { |
754 | static struct dentry *dapei; |
755 | |
756 | if (!dapei) |
757 | dapei = debugfs_create_dir(name: "apei" , NULL); |
758 | |
759 | return dapei; |
760 | } |
761 | EXPORT_SYMBOL_GPL(apei_get_debugfs_dir); |
762 | |
763 | int __weak arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, |
764 | void *data) |
765 | { |
766 | return 1; |
767 | } |
768 | EXPORT_SYMBOL_GPL(arch_apei_enable_cmcff); |
769 | |
770 | void __weak arch_apei_report_mem_error(int sev, |
771 | struct cper_sec_mem_err *mem_err) |
772 | { |
773 | } |
774 | EXPORT_SYMBOL_GPL(arch_apei_report_mem_error); |
775 | |
776 | int apei_osc_setup(void) |
777 | { |
778 | static u8 whea_uuid_str[] = "ed855e0c-6c90-47bf-a62a-26de0fc5ad5c" ; |
779 | acpi_handle handle; |
780 | u32 capbuf[3]; |
781 | struct acpi_osc_context context = { |
782 | .uuid_str = whea_uuid_str, |
783 | .rev = 1, |
784 | .cap.length = sizeof(capbuf), |
785 | .cap.pointer = capbuf, |
786 | }; |
787 | |
788 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
789 | capbuf[OSC_SUPPORT_DWORD] = 1; |
790 | capbuf[OSC_CONTROL_DWORD] = 0; |
791 | |
792 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB" , &handle)) |
793 | || ACPI_FAILURE(acpi_run_osc(handle, &context))) |
794 | return -EIO; |
795 | else { |
796 | kfree(objp: context.ret.pointer); |
797 | return 0; |
798 | } |
799 | } |
800 | EXPORT_SYMBOL_GPL(apei_osc_setup); |
801 | |