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a643ce20 HY |
1 | /* |
2 | * apei-base.c - ACPI Platform Error Interface (APEI) supporting | |
3 | * infrastructure | |
4 | * | |
5 | * APEI allows to report errors (for example from the chipset) to the | |
6 | * the operating system. This improves NMI handling especially. In | |
7 | * addition it supports error serialization and error injection. | |
8 | * | |
9 | * For more information about APEI, please refer to ACPI Specification | |
10 | * version 4.0, chapter 17. | |
11 | * | |
12 | * This file has Common functions used by more than one APEI table, | |
13 | * including framework of interpreter for ERST and EINJ; resource | |
14 | * management for APEI registers. | |
15 | * | |
16 | * Copyright (C) 2009, Intel Corp. | |
17 | * Author: Huang Ying <ying.huang@intel.com> | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or | |
20 | * modify it under the terms of the GNU General Public License version | |
21 | * 2 as published by the Free Software Foundation. | |
22 | * | |
23 | * This program is distributed in the hope that it will be useful, | |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
a643ce20 HY |
27 | */ |
28 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/acpi.h> | |
e0fb8c41 | 33 | #include <linux/slab.h> |
a643ce20 HY |
34 | #include <linux/io.h> |
35 | #include <linux/kref.h> | |
36 | #include <linux/rculist.h> | |
37 | #include <linux/interrupt.h> | |
38 | #include <linux/debugfs.h> | |
d3ab3edc | 39 | #include <asm/unaligned.h> |
a643ce20 HY |
40 | |
41 | #include "apei-internal.h" | |
42 | ||
43 | #define APEI_PFX "APEI: " | |
44 | ||
45 | /* | |
46 | * APEI ERST (Error Record Serialization Table) and EINJ (Error | |
47 | * INJection) interpreter framework. | |
48 | */ | |
49 | ||
50 | #define APEI_EXEC_PRESERVE_REGISTER 0x1 | |
51 | ||
52 | void apei_exec_ctx_init(struct apei_exec_context *ctx, | |
53 | struct apei_exec_ins_type *ins_table, | |
54 | u32 instructions, | |
55 | struct acpi_whea_header *action_table, | |
56 | u32 entries) | |
57 | { | |
58 | ctx->ins_table = ins_table; | |
59 | ctx->instructions = instructions; | |
60 | ctx->action_table = action_table; | |
61 | ctx->entries = entries; | |
62 | } | |
63 | EXPORT_SYMBOL_GPL(apei_exec_ctx_init); | |
64 | ||
65 | int __apei_exec_read_register(struct acpi_whea_header *entry, u64 *val) | |
66 | { | |
67 | int rc; | |
68 | ||
700130b4 | 69 | rc = apei_read(val, &entry->register_region); |
a643ce20 HY |
70 | if (rc) |
71 | return rc; | |
72 | *val >>= entry->register_region.bit_offset; | |
73 | *val &= entry->mask; | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | int apei_exec_read_register(struct apei_exec_context *ctx, | |
79 | struct acpi_whea_header *entry) | |
80 | { | |
81 | int rc; | |
82 | u64 val = 0; | |
83 | ||
84 | rc = __apei_exec_read_register(entry, &val); | |
85 | if (rc) | |
86 | return rc; | |
87 | ctx->value = val; | |
88 | ||
89 | return 0; | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(apei_exec_read_register); | |
92 | ||
93 | int apei_exec_read_register_value(struct apei_exec_context *ctx, | |
94 | struct acpi_whea_header *entry) | |
95 | { | |
96 | int rc; | |
97 | ||
98 | rc = apei_exec_read_register(ctx, entry); | |
99 | if (rc) | |
100 | return rc; | |
101 | ctx->value = (ctx->value == entry->value); | |
102 | ||
103 | return 0; | |
104 | } | |
105 | EXPORT_SYMBOL_GPL(apei_exec_read_register_value); | |
106 | ||
107 | int __apei_exec_write_register(struct acpi_whea_header *entry, u64 val) | |
108 | { | |
109 | int rc; | |
110 | ||
111 | val &= entry->mask; | |
112 | val <<= entry->register_region.bit_offset; | |
113 | if (entry->flags & APEI_EXEC_PRESERVE_REGISTER) { | |
114 | u64 valr = 0; | |
700130b4 | 115 | rc = apei_read(&valr, &entry->register_region); |
a643ce20 HY |
116 | if (rc) |
117 | return rc; | |
118 | valr &= ~(entry->mask << entry->register_region.bit_offset); | |
119 | val |= valr; | |
120 | } | |
700130b4 | 121 | rc = apei_write(val, &entry->register_region); |
a643ce20 HY |
122 | |
123 | return rc; | |
124 | } | |
125 | ||
126 | int apei_exec_write_register(struct apei_exec_context *ctx, | |
127 | struct acpi_whea_header *entry) | |
128 | { | |
129 | return __apei_exec_write_register(entry, ctx->value); | |
130 | } | |
131 | EXPORT_SYMBOL_GPL(apei_exec_write_register); | |
132 | ||
133 | int apei_exec_write_register_value(struct apei_exec_context *ctx, | |
134 | struct acpi_whea_header *entry) | |
135 | { | |
136 | int rc; | |
137 | ||
138 | ctx->value = entry->value; | |
139 | rc = apei_exec_write_register(ctx, entry); | |
140 | ||
141 | return rc; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(apei_exec_write_register_value); | |
144 | ||
145 | int apei_exec_noop(struct apei_exec_context *ctx, | |
146 | struct acpi_whea_header *entry) | |
147 | { | |
148 | return 0; | |
149 | } | |
150 | EXPORT_SYMBOL_GPL(apei_exec_noop); | |
151 | ||
152 | /* | |
153 | * Interpret the specified action. Go through whole action table, | |
154 | * execute all instructions belong to the action. | |
155 | */ | |
eecf2f71 HY |
156 | int __apei_exec_run(struct apei_exec_context *ctx, u8 action, |
157 | bool optional) | |
a643ce20 | 158 | { |
eecf2f71 | 159 | int rc = -ENOENT; |
a643ce20 HY |
160 | u32 i, ip; |
161 | struct acpi_whea_header *entry; | |
162 | apei_exec_ins_func_t run; | |
163 | ||
164 | ctx->ip = 0; | |
165 | ||
166 | /* | |
167 | * "ip" is the instruction pointer of current instruction, | |
168 | * "ctx->ip" specifies the next instruction to executed, | |
169 | * instruction "run" function may change the "ctx->ip" to | |
170 | * implement "goto" semantics. | |
171 | */ | |
172 | rewind: | |
173 | ip = 0; | |
174 | for (i = 0; i < ctx->entries; i++) { | |
175 | entry = &ctx->action_table[i]; | |
176 | if (entry->action != action) | |
177 | continue; | |
178 | if (ip == ctx->ip) { | |
179 | if (entry->instruction >= ctx->instructions || | |
180 | !ctx->ins_table[entry->instruction].run) { | |
181 | pr_warning(FW_WARN APEI_PFX | |
182 | "Invalid action table, unknown instruction type: %d\n", | |
183 | entry->instruction); | |
184 | return -EINVAL; | |
185 | } | |
186 | run = ctx->ins_table[entry->instruction].run; | |
187 | rc = run(ctx, entry); | |
188 | if (rc < 0) | |
189 | return rc; | |
190 | else if (rc != APEI_EXEC_SET_IP) | |
191 | ctx->ip++; | |
192 | } | |
193 | ip++; | |
194 | if (ctx->ip < ip) | |
195 | goto rewind; | |
196 | } | |
197 | ||
eecf2f71 | 198 | return !optional && rc < 0 ? rc : 0; |
a643ce20 | 199 | } |
eecf2f71 | 200 | EXPORT_SYMBOL_GPL(__apei_exec_run); |
a643ce20 HY |
201 | |
202 | typedef int (*apei_exec_entry_func_t)(struct apei_exec_context *ctx, | |
203 | struct acpi_whea_header *entry, | |
204 | void *data); | |
205 | ||
206 | static int apei_exec_for_each_entry(struct apei_exec_context *ctx, | |
207 | apei_exec_entry_func_t func, | |
208 | void *data, | |
209 | int *end) | |
210 | { | |
211 | u8 ins; | |
212 | int i, rc; | |
213 | struct acpi_whea_header *entry; | |
214 | struct apei_exec_ins_type *ins_table = ctx->ins_table; | |
215 | ||
216 | for (i = 0; i < ctx->entries; i++) { | |
217 | entry = ctx->action_table + i; | |
218 | ins = entry->instruction; | |
219 | if (end) | |
220 | *end = i; | |
221 | if (ins >= ctx->instructions || !ins_table[ins].run) { | |
222 | pr_warning(FW_WARN APEI_PFX | |
223 | "Invalid action table, unknown instruction type: %d\n", | |
224 | ins); | |
225 | return -EINVAL; | |
226 | } | |
227 | rc = func(ctx, entry, data); | |
228 | if (rc) | |
229 | return rc; | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static int pre_map_gar_callback(struct apei_exec_context *ctx, | |
236 | struct acpi_whea_header *entry, | |
237 | void *data) | |
238 | { | |
239 | u8 ins = entry->instruction; | |
240 | ||
241 | if (ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER) | |
34ddeb03 | 242 | return apei_map_generic_address(&entry->register_region); |
a643ce20 HY |
243 | |
244 | return 0; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Pre-map all GARs in action table to make it possible to access them | |
249 | * in NMI handler. | |
250 | */ | |
251 | int apei_exec_pre_map_gars(struct apei_exec_context *ctx) | |
252 | { | |
253 | int rc, end; | |
254 | ||
255 | rc = apei_exec_for_each_entry(ctx, pre_map_gar_callback, | |
256 | NULL, &end); | |
257 | if (rc) { | |
258 | struct apei_exec_context ctx_unmap; | |
259 | memcpy(&ctx_unmap, ctx, sizeof(*ctx)); | |
260 | ctx_unmap.entries = end; | |
261 | apei_exec_post_unmap_gars(&ctx_unmap); | |
262 | } | |
263 | ||
264 | return rc; | |
265 | } | |
266 | EXPORT_SYMBOL_GPL(apei_exec_pre_map_gars); | |
267 | ||
268 | static int post_unmap_gar_callback(struct apei_exec_context *ctx, | |
269 | struct acpi_whea_header *entry, | |
270 | void *data) | |
271 | { | |
272 | u8 ins = entry->instruction; | |
273 | ||
274 | if (ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER) | |
34ddeb03 | 275 | apei_unmap_generic_address(&entry->register_region); |
a643ce20 HY |
276 | |
277 | return 0; | |
278 | } | |
279 | ||
280 | /* Post-unmap all GAR in action table. */ | |
281 | int apei_exec_post_unmap_gars(struct apei_exec_context *ctx) | |
282 | { | |
283 | return apei_exec_for_each_entry(ctx, post_unmap_gar_callback, | |
284 | NULL, NULL); | |
285 | } | |
286 | EXPORT_SYMBOL_GPL(apei_exec_post_unmap_gars); | |
287 | ||
288 | /* | |
289 | * Resource management for GARs in APEI | |
290 | */ | |
291 | struct apei_res { | |
292 | struct list_head list; | |
293 | unsigned long start; | |
294 | unsigned long end; | |
295 | }; | |
296 | ||
297 | /* Collect all resources requested, to avoid conflict */ | |
298 | struct apei_resources apei_resources_all = { | |
299 | .iomem = LIST_HEAD_INIT(apei_resources_all.iomem), | |
300 | .ioport = LIST_HEAD_INIT(apei_resources_all.ioport), | |
301 | }; | |
302 | ||
303 | static int apei_res_add(struct list_head *res_list, | |
304 | unsigned long start, unsigned long size) | |
305 | { | |
306 | struct apei_res *res, *resn, *res_ins = NULL; | |
307 | unsigned long end = start + size; | |
308 | ||
309 | if (end <= start) | |
310 | return 0; | |
311 | repeat: | |
312 | list_for_each_entry_safe(res, resn, res_list, list) { | |
313 | if (res->start > end || res->end < start) | |
314 | continue; | |
315 | else if (end <= res->end && start >= res->start) { | |
316 | kfree(res_ins); | |
317 | return 0; | |
318 | } | |
319 | list_del(&res->list); | |
320 | res->start = start = min(res->start, start); | |
321 | res->end = end = max(res->end, end); | |
322 | kfree(res_ins); | |
323 | res_ins = res; | |
324 | goto repeat; | |
325 | } | |
326 | ||
327 | if (res_ins) | |
328 | list_add(&res_ins->list, res_list); | |
329 | else { | |
330 | res_ins = kmalloc(sizeof(*res), GFP_KERNEL); | |
331 | if (!res_ins) | |
332 | return -ENOMEM; | |
333 | res_ins->start = start; | |
334 | res_ins->end = end; | |
335 | list_add(&res_ins->list, res_list); | |
336 | } | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | static int apei_res_sub(struct list_head *res_list1, | |
342 | struct list_head *res_list2) | |
343 | { | |
344 | struct apei_res *res1, *resn1, *res2, *res; | |
345 | res1 = list_entry(res_list1->next, struct apei_res, list); | |
346 | resn1 = list_entry(res1->list.next, struct apei_res, list); | |
347 | while (&res1->list != res_list1) { | |
348 | list_for_each_entry(res2, res_list2, list) { | |
349 | if (res1->start >= res2->end || | |
350 | res1->end <= res2->start) | |
351 | continue; | |
352 | else if (res1->end <= res2->end && | |
353 | res1->start >= res2->start) { | |
354 | list_del(&res1->list); | |
355 | kfree(res1); | |
356 | break; | |
357 | } else if (res1->end > res2->end && | |
358 | res1->start < res2->start) { | |
359 | res = kmalloc(sizeof(*res), GFP_KERNEL); | |
360 | if (!res) | |
361 | return -ENOMEM; | |
362 | res->start = res2->end; | |
363 | res->end = res1->end; | |
364 | res1->end = res2->start; | |
365 | list_add(&res->list, &res1->list); | |
366 | resn1 = res; | |
367 | } else { | |
368 | if (res1->start < res2->start) | |
369 | res1->end = res2->start; | |
370 | else | |
371 | res1->start = res2->end; | |
372 | } | |
373 | } | |
374 | res1 = resn1; | |
375 | resn1 = list_entry(resn1->list.next, struct apei_res, list); | |
376 | } | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static void apei_res_clean(struct list_head *res_list) | |
382 | { | |
383 | struct apei_res *res, *resn; | |
384 | ||
385 | list_for_each_entry_safe(res, resn, res_list, list) { | |
386 | list_del(&res->list); | |
387 | kfree(res); | |
388 | } | |
389 | } | |
390 | ||
391 | void apei_resources_fini(struct apei_resources *resources) | |
392 | { | |
393 | apei_res_clean(&resources->iomem); | |
394 | apei_res_clean(&resources->ioport); | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(apei_resources_fini); | |
397 | ||
398 | static int apei_resources_merge(struct apei_resources *resources1, | |
399 | struct apei_resources *resources2) | |
400 | { | |
401 | int rc; | |
402 | struct apei_res *res; | |
403 | ||
404 | list_for_each_entry(res, &resources2->iomem, list) { | |
405 | rc = apei_res_add(&resources1->iomem, res->start, | |
406 | res->end - res->start); | |
407 | if (rc) | |
408 | return rc; | |
409 | } | |
410 | list_for_each_entry(res, &resources2->ioport, list) { | |
411 | rc = apei_res_add(&resources1->ioport, res->start, | |
412 | res->end - res->start); | |
413 | if (rc) | |
414 | return rc; | |
415 | } | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
fdea163d HY |
420 | int apei_resources_add(struct apei_resources *resources, |
421 | unsigned long start, unsigned long size, | |
422 | bool iomem) | |
423 | { | |
424 | if (iomem) | |
425 | return apei_res_add(&resources->iomem, start, size); | |
426 | else | |
427 | return apei_res_add(&resources->ioport, start, size); | |
428 | } | |
429 | EXPORT_SYMBOL_GPL(apei_resources_add); | |
430 | ||
a643ce20 HY |
431 | /* |
432 | * EINJ has two groups of GARs (EINJ table entry and trigger table | |
433 | * entry), so common resources are subtracted from the trigger table | |
434 | * resources before the second requesting. | |
435 | */ | |
436 | int apei_resources_sub(struct apei_resources *resources1, | |
437 | struct apei_resources *resources2) | |
438 | { | |
439 | int rc; | |
440 | ||
441 | rc = apei_res_sub(&resources1->iomem, &resources2->iomem); | |
442 | if (rc) | |
443 | return rc; | |
444 | return apei_res_sub(&resources1->ioport, &resources2->ioport); | |
445 | } | |
446 | EXPORT_SYMBOL_GPL(apei_resources_sub); | |
447 | ||
d91525eb | 448 | static int apei_get_res_callback(__u64 start, __u64 size, void *data) |
4134b8c8 HY |
449 | { |
450 | struct apei_resources *resources = data; | |
451 | return apei_res_add(&resources->iomem, start, size); | |
452 | } | |
453 | ||
454 | static int apei_get_nvs_resources(struct apei_resources *resources) | |
455 | { | |
d91525eb CG |
456 | return acpi_nvs_for_each_region(apei_get_res_callback, resources); |
457 | } | |
458 | ||
459 | int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size, | |
460 | void *data), void *data); | |
461 | static int apei_get_arch_resources(struct apei_resources *resources) | |
462 | ||
463 | { | |
464 | return arch_apei_filter_addr(apei_get_res_callback, resources); | |
4134b8c8 HY |
465 | } |
466 | ||
a643ce20 | 467 | /* |
4134b8c8 | 468 | * IO memory/port resource management mechanism is used to check |
a643ce20 HY |
469 | * whether memory/port area used by GARs conflicts with normal memory |
470 | * or IO memory/port of devices. | |
471 | */ | |
472 | int apei_resources_request(struct apei_resources *resources, | |
473 | const char *desc) | |
474 | { | |
23f124ca | 475 | struct apei_res *res, *res_bak = NULL; |
a643ce20 | 476 | struct resource *r; |
d91525eb | 477 | struct apei_resources nvs_resources, arch_res; |
23f124ca | 478 | int rc; |
a643ce20 | 479 | |
23f124ca HY |
480 | rc = apei_resources_sub(resources, &apei_resources_all); |
481 | if (rc) | |
482 | return rc; | |
a643ce20 | 483 | |
4134b8c8 HY |
484 | /* |
485 | * Some firmware uses ACPI NVS region, that has been marked as | |
486 | * busy, so exclude it from APEI resources to avoid false | |
487 | * conflict. | |
488 | */ | |
489 | apei_resources_init(&nvs_resources); | |
490 | rc = apei_get_nvs_resources(&nvs_resources); | |
491 | if (rc) | |
d91525eb | 492 | goto nvs_res_fini; |
4134b8c8 HY |
493 | rc = apei_resources_sub(resources, &nvs_resources); |
494 | if (rc) | |
d91525eb CG |
495 | goto nvs_res_fini; |
496 | ||
497 | if (arch_apei_filter_addr) { | |
498 | apei_resources_init(&arch_res); | |
499 | rc = apei_get_arch_resources(&arch_res); | |
500 | if (rc) | |
501 | goto arch_res_fini; | |
502 | rc = apei_resources_sub(resources, &arch_res); | |
503 | if (rc) | |
504 | goto arch_res_fini; | |
505 | } | |
4134b8c8 | 506 | |
23f124ca | 507 | rc = -EINVAL; |
a643ce20 HY |
508 | list_for_each_entry(res, &resources->iomem, list) { |
509 | r = request_mem_region(res->start, res->end - res->start, | |
510 | desc); | |
511 | if (!r) { | |
512 | pr_err(APEI_PFX | |
46b91e37 | 513 | "Can not request [mem %#010llx-%#010llx] for %s registers\n", |
a643ce20 | 514 | (unsigned long long)res->start, |
46b91e37 | 515 | (unsigned long long)res->end - 1, desc); |
a643ce20 HY |
516 | res_bak = res; |
517 | goto err_unmap_iomem; | |
518 | } | |
519 | } | |
520 | ||
521 | list_for_each_entry(res, &resources->ioport, list) { | |
522 | r = request_region(res->start, res->end - res->start, desc); | |
523 | if (!r) { | |
524 | pr_err(APEI_PFX | |
46b91e37 | 525 | "Can not request [io %#06llx-%#06llx] for %s registers\n", |
a643ce20 | 526 | (unsigned long long)res->start, |
46b91e37 | 527 | (unsigned long long)res->end - 1, desc); |
a643ce20 HY |
528 | res_bak = res; |
529 | goto err_unmap_ioport; | |
530 | } | |
531 | } | |
532 | ||
23f124ca HY |
533 | rc = apei_resources_merge(&apei_resources_all, resources); |
534 | if (rc) { | |
535 | pr_err(APEI_PFX "Fail to merge resources!\n"); | |
536 | goto err_unmap_ioport; | |
537 | } | |
a643ce20 | 538 | |
e56c9256 JH |
539 | goto arch_res_fini; |
540 | ||
a643ce20 HY |
541 | err_unmap_ioport: |
542 | list_for_each_entry(res, &resources->ioport, list) { | |
543 | if (res == res_bak) | |
544 | break; | |
2663b3f2 | 545 | release_region(res->start, res->end - res->start); |
a643ce20 HY |
546 | } |
547 | res_bak = NULL; | |
548 | err_unmap_iomem: | |
549 | list_for_each_entry(res, &resources->iomem, list) { | |
550 | if (res == res_bak) | |
551 | break; | |
2663b3f2 | 552 | release_mem_region(res->start, res->end - res->start); |
a643ce20 | 553 | } |
d91525eb | 554 | arch_res_fini: |
e56c9256 JH |
555 | if (arch_apei_filter_addr) |
556 | apei_resources_fini(&arch_res); | |
d91525eb | 557 | nvs_res_fini: |
4134b8c8 | 558 | apei_resources_fini(&nvs_resources); |
23f124ca | 559 | return rc; |
a643ce20 HY |
560 | } |
561 | EXPORT_SYMBOL_GPL(apei_resources_request); | |
562 | ||
563 | void apei_resources_release(struct apei_resources *resources) | |
564 | { | |
23f124ca | 565 | int rc; |
a643ce20 HY |
566 | struct apei_res *res; |
567 | ||
568 | list_for_each_entry(res, &resources->iomem, list) | |
569 | release_mem_region(res->start, res->end - res->start); | |
570 | list_for_each_entry(res, &resources->ioport, list) | |
571 | release_region(res->start, res->end - res->start); | |
572 | ||
23f124ca HY |
573 | rc = apei_resources_sub(&apei_resources_all, resources); |
574 | if (rc) | |
575 | pr_err(APEI_PFX "Fail to sub resources!\n"); | |
a643ce20 HY |
576 | } |
577 | EXPORT_SYMBOL_GPL(apei_resources_release); | |
578 | ||
15afae60 GH |
579 | static int apei_check_gar(struct acpi_generic_address *reg, u64 *paddr, |
580 | u32 *access_bit_width) | |
a643ce20 | 581 | { |
15afae60 | 582 | u32 bit_width, bit_offset, access_size_code, space_id; |
a643ce20 | 583 | |
15afae60 GH |
584 | bit_width = reg->bit_width; |
585 | bit_offset = reg->bit_offset; | |
586 | access_size_code = reg->access_width; | |
a643ce20 | 587 | space_id = reg->space_id; |
d3ab3edc | 588 | *paddr = get_unaligned(®->address); |
a643ce20 HY |
589 | if (!*paddr) { |
590 | pr_warning(FW_BUG APEI_PFX | |
15afae60 GH |
591 | "Invalid physical address in GAR [0x%llx/%u/%u/%u/%u]\n", |
592 | *paddr, bit_width, bit_offset, access_size_code, | |
593 | space_id); | |
a643ce20 HY |
594 | return -EINVAL; |
595 | } | |
596 | ||
15afae60 | 597 | if (access_size_code < 1 || access_size_code > 4) { |
a643ce20 | 598 | pr_warning(FW_BUG APEI_PFX |
15afae60 GH |
599 | "Invalid access size code in GAR [0x%llx/%u/%u/%u/%u]\n", |
600 | *paddr, bit_width, bit_offset, access_size_code, | |
601 | space_id); | |
602 | return -EINVAL; | |
603 | } | |
604 | *access_bit_width = 1UL << (access_size_code + 2); | |
605 | ||
f712c71f JD |
606 | /* Fixup common BIOS bug */ |
607 | if (bit_width == 32 && bit_offset == 0 && (*paddr & 0x03) == 0 && | |
608 | *access_bit_width < 32) | |
609 | *access_bit_width = 32; | |
25216865 LZ |
610 | else if (bit_width == 64 && bit_offset == 0 && (*paddr & 0x07) == 0 && |
611 | *access_bit_width < 64) | |
612 | *access_bit_width = 64; | |
f712c71f | 613 | |
15afae60 GH |
614 | if ((bit_width + bit_offset) > *access_bit_width) { |
615 | pr_warning(FW_BUG APEI_PFX | |
616 | "Invalid bit width + offset in GAR [0x%llx/%u/%u/%u/%u]\n", | |
617 | *paddr, bit_width, bit_offset, access_size_code, | |
618 | space_id); | |
a643ce20 HY |
619 | return -EINVAL; |
620 | } | |
621 | ||
622 | if (space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY && | |
623 | space_id != ACPI_ADR_SPACE_SYSTEM_IO) { | |
624 | pr_warning(FW_BUG APEI_PFX | |
15afae60 GH |
625 | "Invalid address space type in GAR [0x%llx/%u/%u/%u/%u]\n", |
626 | *paddr, bit_width, bit_offset, access_size_code, | |
627 | space_id); | |
a643ce20 HY |
628 | return -EINVAL; |
629 | } | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
34ddeb03 HY |
634 | int apei_map_generic_address(struct acpi_generic_address *reg) |
635 | { | |
636 | int rc; | |
637 | u32 access_bit_width; | |
638 | u64 address; | |
639 | ||
640 | rc = apei_check_gar(reg, &address, &access_bit_width); | |
641 | if (rc) | |
642 | return rc; | |
643 | return acpi_os_map_generic_address(reg); | |
644 | } | |
645 | EXPORT_SYMBOL_GPL(apei_map_generic_address); | |
646 | ||
700130b4 MS |
647 | /* read GAR in interrupt (including NMI) or process context */ |
648 | int apei_read(u64 *val, struct acpi_generic_address *reg) | |
649 | { | |
650 | int rc; | |
15afae60 | 651 | u32 access_bit_width; |
700130b4 | 652 | u64 address; |
700130b4 MS |
653 | acpi_status status; |
654 | ||
15afae60 | 655 | rc = apei_check_gar(reg, &address, &access_bit_width); |
700130b4 MS |
656 | if (rc) |
657 | return rc; | |
658 | ||
700130b4 MS |
659 | *val = 0; |
660 | switch(reg->space_id) { | |
661 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: | |
73f05330 | 662 | status = acpi_os_read_memory((acpi_physical_address) address, |
15afae60 | 663 | val, access_bit_width); |
700130b4 MS |
664 | if (ACPI_FAILURE(status)) |
665 | return -EIO; | |
700130b4 MS |
666 | break; |
667 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
15afae60 GH |
668 | status = acpi_os_read_port(address, (u32 *)val, |
669 | access_bit_width); | |
700130b4 MS |
670 | if (ACPI_FAILURE(status)) |
671 | return -EIO; | |
672 | break; | |
673 | default: | |
674 | return -EINVAL; | |
675 | } | |
676 | ||
677 | return 0; | |
678 | } | |
679 | EXPORT_SYMBOL_GPL(apei_read); | |
680 | ||
681 | /* write GAR in interrupt (including NMI) or process context */ | |
682 | int apei_write(u64 val, struct acpi_generic_address *reg) | |
683 | { | |
684 | int rc; | |
15afae60 | 685 | u32 access_bit_width; |
700130b4 | 686 | u64 address; |
700130b4 MS |
687 | acpi_status status; |
688 | ||
15afae60 | 689 | rc = apei_check_gar(reg, &address, &access_bit_width); |
700130b4 MS |
690 | if (rc) |
691 | return rc; | |
692 | ||
700130b4 MS |
693 | switch (reg->space_id) { |
694 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: | |
73f05330 | 695 | status = acpi_os_write_memory((acpi_physical_address) address, |
15afae60 | 696 | val, access_bit_width); |
700130b4 MS |
697 | if (ACPI_FAILURE(status)) |
698 | return -EIO; | |
700130b4 MS |
699 | break; |
700 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
15afae60 | 701 | status = acpi_os_write_port(address, val, access_bit_width); |
700130b4 MS |
702 | if (ACPI_FAILURE(status)) |
703 | return -EIO; | |
704 | break; | |
705 | default: | |
706 | return -EINVAL; | |
707 | } | |
708 | ||
709 | return 0; | |
710 | } | |
711 | EXPORT_SYMBOL_GPL(apei_write); | |
712 | ||
a643ce20 HY |
713 | static int collect_res_callback(struct apei_exec_context *ctx, |
714 | struct acpi_whea_header *entry, | |
715 | void *data) | |
716 | { | |
717 | struct apei_resources *resources = data; | |
718 | struct acpi_generic_address *reg = &entry->register_region; | |
719 | u8 ins = entry->instruction; | |
15afae60 | 720 | u32 access_bit_width; |
a643ce20 HY |
721 | u64 paddr; |
722 | int rc; | |
723 | ||
724 | if (!(ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER)) | |
725 | return 0; | |
726 | ||
15afae60 | 727 | rc = apei_check_gar(reg, &paddr, &access_bit_width); |
a643ce20 HY |
728 | if (rc) |
729 | return rc; | |
730 | ||
731 | switch (reg->space_id) { | |
732 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: | |
733 | return apei_res_add(&resources->iomem, paddr, | |
15afae60 | 734 | access_bit_width / 8); |
a643ce20 HY |
735 | case ACPI_ADR_SPACE_SYSTEM_IO: |
736 | return apei_res_add(&resources->ioport, paddr, | |
15afae60 | 737 | access_bit_width / 8); |
a643ce20 HY |
738 | default: |
739 | return -EINVAL; | |
740 | } | |
741 | } | |
742 | ||
743 | /* | |
744 | * Same register may be used by multiple instructions in GARs, so | |
745 | * resources are collected before requesting. | |
746 | */ | |
747 | int apei_exec_collect_resources(struct apei_exec_context *ctx, | |
748 | struct apei_resources *resources) | |
749 | { | |
750 | return apei_exec_for_each_entry(ctx, collect_res_callback, | |
751 | resources, NULL); | |
752 | } | |
753 | EXPORT_SYMBOL_GPL(apei_exec_collect_resources); | |
754 | ||
755 | struct dentry *apei_get_debugfs_dir(void) | |
756 | { | |
757 | static struct dentry *dapei; | |
758 | ||
759 | if (!dapei) | |
760 | dapei = debugfs_create_dir("apei", NULL); | |
761 | ||
762 | return dapei; | |
763 | } | |
764 | EXPORT_SYMBOL_GPL(apei_get_debugfs_dir); | |
9fb0bfe1 | 765 | |
9dae3d0d TN |
766 | int __weak arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, |
767 | void *data) | |
768 | { | |
769 | return 1; | |
770 | } | |
771 | EXPORT_SYMBOL_GPL(arch_apei_enable_cmcff); | |
772 | ||
773 | void __weak arch_apei_report_mem_error(int sev, | |
774 | struct cper_sec_mem_err *mem_err) | |
775 | { | |
776 | } | |
777 | EXPORT_SYMBOL_GPL(arch_apei_report_mem_error); | |
778 | ||
9fb0bfe1 HY |
779 | int apei_osc_setup(void) |
780 | { | |
781 | static u8 whea_uuid_str[] = "ed855e0c-6c90-47bf-a62a-26de0fc5ad5c"; | |
782 | acpi_handle handle; | |
783 | u32 capbuf[3]; | |
784 | struct acpi_osc_context context = { | |
785 | .uuid_str = whea_uuid_str, | |
786 | .rev = 1, | |
787 | .cap.length = sizeof(capbuf), | |
788 | .cap.pointer = capbuf, | |
789 | }; | |
790 | ||
b938a229 BH |
791 | capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; |
792 | capbuf[OSC_SUPPORT_DWORD] = 1; | |
793 | capbuf[OSC_CONTROL_DWORD] = 0; | |
9fb0bfe1 HY |
794 | |
795 | if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)) | |
796 | || ACPI_FAILURE(acpi_run_osc(handle, &context))) | |
797 | return -EIO; | |
798 | else { | |
799 | kfree(context.ret.pointer); | |
800 | return 0; | |
801 | } | |
802 | } | |
803 | EXPORT_SYMBOL_GPL(apei_osc_setup); |