1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * APEI Error INJection support
4 *
5 * EINJ provides a hardware error injection mechanism, this is useful
6 * for debugging and testing of other APEI and RAS features.
7 *
8 * For more information about EINJ, please refer to ACPI Specification
9 * version 4.0, section 17.5.
10 *
11 * Copyright 2009-2010 Intel Corp.
12 * Author: Huang Ying <ying.huang@intel.com>
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/io.h>
19 #include <linux/debugfs.h>
20 #include <linux/seq_file.h>
21 #include <linux/nmi.h>
22 #include <linux/delay.h>
23 #include <linux/mm.h>
24 #include <asm/unaligned.h>
25
26 #include "apei-internal.h"
27
28 #undef pr_fmt
29 #define pr_fmt(fmt) "EINJ: " fmt
30
31 #define SPIN_UNIT 100 /* 100ns */
32 /* Firmware should respond within 1 milliseconds */
33 #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
34 #define ACPI5_VENDOR_BIT BIT(31)
35 #define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \
36 ACPI_EINJ_MEMORY_UNCORRECTABLE | \
37 ACPI_EINJ_MEMORY_FATAL)
38
39 /*
40 * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action.
41 */
42 static int acpi5;
43
44 struct set_error_type_with_address {
45 u32 type;
46 u32 vendor_extension;
47 u32 flags;
48 u32 apicid;
49 u64 memory_address;
50 u64 memory_address_range;
51 u32 pcie_sbdf;
52 };
53 enum {
54 SETWA_FLAGS_APICID = 1,
55 SETWA_FLAGS_MEM = 2,
56 SETWA_FLAGS_PCIE_SBDF = 4,
57 };
58
59 /*
60 * Vendor extensions for platform specific operations
61 */
62 struct vendor_error_type_extension {
63 u32 length;
64 u32 pcie_sbdf;
65 u16 vendor_id;
66 u16 device_id;
67 u8 rev_id;
68 u8 reserved[3];
69 };
70
71 static u32 notrigger;
72
73 static u32 vendor_flags;
74 static struct debugfs_blob_wrapper vendor_blob;
75 static char vendor_dev[64];
76
77 /*
78 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
79 * EINJ table through an unpublished extension. Use with caution as
80 * most will ignore the parameter and make their own choice of address
81 * for error injection. This extension is used only if
82 * param_extension module parameter is specified.
83 */
84 struct einj_parameter {
85 u64 type;
86 u64 reserved1;
87 u64 reserved2;
88 u64 param1;
89 u64 param2;
90 };
91
92 #define EINJ_OP_BUSY 0x1
93 #define EINJ_STATUS_SUCCESS 0x0
94 #define EINJ_STATUS_FAIL 0x1
95 #define EINJ_STATUS_INVAL 0x2
96
97 #define EINJ_TAB_ENTRY(tab) \
98 ((struct acpi_whea_header *)((char *)(tab) + \
99 sizeof(struct acpi_table_einj)))
100
101 static bool param_extension;
102 module_param(param_extension, bool, 0);
103
104 static struct acpi_table_einj *einj_tab;
105
106 static struct apei_resources einj_resources;
107
108 static struct apei_exec_ins_type einj_ins_type[] = {
109 [ACPI_EINJ_READ_REGISTER] = {
110 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
111 .run = apei_exec_read_register,
112 },
113 [ACPI_EINJ_READ_REGISTER_VALUE] = {
114 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
115 .run = apei_exec_read_register_value,
116 },
117 [ACPI_EINJ_WRITE_REGISTER] = {
118 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
119 .run = apei_exec_write_register,
120 },
121 [ACPI_EINJ_WRITE_REGISTER_VALUE] = {
122 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
123 .run = apei_exec_write_register_value,
124 },
125 [ACPI_EINJ_NOOP] = {
126 .flags = 0,
127 .run = apei_exec_noop,
128 },
129 };
130
131 /*
132 * Prevent EINJ interpreter to run simultaneously, because the
133 * corresponding firmware implementation may not work properly when
134 * invoked simultaneously.
135 */
136 static DEFINE_MUTEX(einj_mutex);
137
138 static void *einj_param;
139
einj_exec_ctx_init(struct apei_exec_context * ctx)140 static void einj_exec_ctx_init(struct apei_exec_context *ctx)
141 {
142 apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
143 EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
144 }
145
__einj_get_available_error_type(u32 * type)146 static int __einj_get_available_error_type(u32 *type)
147 {
148 struct apei_exec_context ctx;
149 int rc;
150
151 einj_exec_ctx_init(&ctx);
152 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
153 if (rc)
154 return rc;
155 *type = apei_exec_ctx_get_output(&ctx);
156
157 return 0;
158 }
159
160 /* Get error injection capabilities of the platform */
einj_get_available_error_type(u32 * type)161 static int einj_get_available_error_type(u32 *type)
162 {
163 int rc;
164
165 mutex_lock(&einj_mutex);
166 rc = __einj_get_available_error_type(type);
167 mutex_unlock(&einj_mutex);
168
169 return rc;
170 }
171
einj_timedout(u64 * t)172 static int einj_timedout(u64 *t)
173 {
174 if ((s64)*t < SPIN_UNIT) {
175 pr_warn(FW_WARN "Firmware does not respond in time\n");
176 return 1;
177 }
178 *t -= SPIN_UNIT;
179 ndelay(SPIN_UNIT);
180 touch_nmi_watchdog();
181 return 0;
182 }
183
check_vendor_extension(u64 paddr,struct set_error_type_with_address * v5param)184 static void check_vendor_extension(u64 paddr,
185 struct set_error_type_with_address *v5param)
186 {
187 int offset = v5param->vendor_extension;
188 struct vendor_error_type_extension *v;
189 u32 sbdf;
190
191 if (!offset)
192 return;
193 v = acpi_os_map_iomem(paddr + offset, sizeof(*v));
194 if (!v)
195 return;
196 sbdf = v->pcie_sbdf;
197 sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n",
198 sbdf >> 24, (sbdf >> 16) & 0xff,
199 (sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7,
200 v->vendor_id, v->device_id, v->rev_id);
201 acpi_os_unmap_iomem(v, sizeof(*v));
202 }
203
einj_get_parameter_address(void)204 static void *einj_get_parameter_address(void)
205 {
206 int i;
207 u64 pa_v4 = 0, pa_v5 = 0;
208 struct acpi_whea_header *entry;
209
210 entry = EINJ_TAB_ENTRY(einj_tab);
211 for (i = 0; i < einj_tab->entries; i++) {
212 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
213 entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
214 entry->register_region.space_id ==
215 ACPI_ADR_SPACE_SYSTEM_MEMORY)
216 pa_v4 = get_unaligned(&entry->register_region.address);
217 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
218 entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
219 entry->register_region.space_id ==
220 ACPI_ADR_SPACE_SYSTEM_MEMORY)
221 pa_v5 = get_unaligned(&entry->register_region.address);
222 entry++;
223 }
224 if (pa_v5) {
225 struct set_error_type_with_address *v5param;
226
227 v5param = acpi_os_map_iomem(pa_v5, sizeof(*v5param));
228 if (v5param) {
229 acpi5 = 1;
230 check_vendor_extension(pa_v5, v5param);
231 return v5param;
232 }
233 }
234 if (param_extension && pa_v4) {
235 struct einj_parameter *v4param;
236
237 v4param = acpi_os_map_iomem(pa_v4, sizeof(*v4param));
238 if (!v4param)
239 return NULL;
240 if (v4param->reserved1 || v4param->reserved2) {
241 acpi_os_unmap_iomem(v4param, sizeof(*v4param));
242 return NULL;
243 }
244 return v4param;
245 }
246
247 return NULL;
248 }
249
250 /* do sanity check to trigger table */
einj_check_trigger_header(struct acpi_einj_trigger * trigger_tab)251 static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
252 {
253 if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
254 return -EINVAL;
255 if (trigger_tab->table_size > PAGE_SIZE ||
256 trigger_tab->table_size < trigger_tab->header_size)
257 return -EINVAL;
258 if (trigger_tab->entry_count !=
259 (trigger_tab->table_size - trigger_tab->header_size) /
260 sizeof(struct acpi_einj_entry))
261 return -EINVAL;
262
263 return 0;
264 }
265
einj_get_trigger_parameter_region(struct acpi_einj_trigger * trigger_tab,u64 param1,u64 param2)266 static struct acpi_generic_address *einj_get_trigger_parameter_region(
267 struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2)
268 {
269 int i;
270 struct acpi_whea_header *entry;
271
272 entry = (struct acpi_whea_header *)
273 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
274 for (i = 0; i < trigger_tab->entry_count; i++) {
275 if (entry->action == ACPI_EINJ_TRIGGER_ERROR &&
276 entry->instruction <= ACPI_EINJ_WRITE_REGISTER_VALUE &&
277 entry->register_region.space_id ==
278 ACPI_ADR_SPACE_SYSTEM_MEMORY &&
279 (entry->register_region.address & param2) == (param1 & param2))
280 return &entry->register_region;
281 entry++;
282 }
283
284 return NULL;
285 }
286 /* Execute instructions in trigger error action table */
__einj_error_trigger(u64 trigger_paddr,u32 type,u64 param1,u64 param2)287 static int __einj_error_trigger(u64 trigger_paddr, u32 type,
288 u64 param1, u64 param2)
289 {
290 struct acpi_einj_trigger *trigger_tab = NULL;
291 struct apei_exec_context trigger_ctx;
292 struct apei_resources trigger_resources;
293 struct acpi_whea_header *trigger_entry;
294 struct resource *r;
295 u32 table_size;
296 int rc = -EIO;
297 struct acpi_generic_address *trigger_param_region = NULL;
298
299 r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
300 "APEI EINJ Trigger Table");
301 if (!r) {
302 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger table\n",
303 (unsigned long long)trigger_paddr,
304 (unsigned long long)trigger_paddr +
305 sizeof(*trigger_tab) - 1);
306 goto out;
307 }
308 trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
309 if (!trigger_tab) {
310 pr_err("Failed to map trigger table!\n");
311 goto out_rel_header;
312 }
313 rc = einj_check_trigger_header(trigger_tab);
314 if (rc) {
315 pr_warn(FW_BUG "Invalid trigger error action table.\n");
316 goto out_rel_header;
317 }
318
319 /* No action structures in the TRIGGER_ERROR table, nothing to do */
320 if (!trigger_tab->entry_count)
321 goto out_rel_header;
322
323 rc = -EIO;
324 table_size = trigger_tab->table_size;
325 r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
326 table_size - sizeof(*trigger_tab),
327 "APEI EINJ Trigger Table");
328 if (!r) {
329 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n",
330 (unsigned long long)trigger_paddr + sizeof(*trigger_tab),
331 (unsigned long long)trigger_paddr + table_size - 1);
332 goto out_rel_header;
333 }
334 iounmap(trigger_tab);
335 trigger_tab = ioremap_cache(trigger_paddr, table_size);
336 if (!trigger_tab) {
337 pr_err("Failed to map trigger table!\n");
338 goto out_rel_entry;
339 }
340 trigger_entry = (struct acpi_whea_header *)
341 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
342 apei_resources_init(&trigger_resources);
343 apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
344 ARRAY_SIZE(einj_ins_type),
345 trigger_entry, trigger_tab->entry_count);
346 rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
347 if (rc)
348 goto out_fini;
349 rc = apei_resources_sub(&trigger_resources, &einj_resources);
350 if (rc)
351 goto out_fini;
352 /*
353 * Some firmware will access target address specified in
354 * param1 to trigger the error when injecting memory error.
355 * This will cause resource conflict with regular memory. So
356 * remove it from trigger table resources.
357 */
358 if ((param_extension || acpi5) && (type & MEM_ERROR_MASK) && param2) {
359 struct apei_resources addr_resources;
360 apei_resources_init(&addr_resources);
361 trigger_param_region = einj_get_trigger_parameter_region(
362 trigger_tab, param1, param2);
363 if (trigger_param_region) {
364 rc = apei_resources_add(&addr_resources,
365 trigger_param_region->address,
366 trigger_param_region->bit_width/8, true);
367 if (rc)
368 goto out_fini;
369 rc = apei_resources_sub(&trigger_resources,
370 &addr_resources);
371 }
372 apei_resources_fini(&addr_resources);
373 if (rc)
374 goto out_fini;
375 }
376 rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
377 if (rc)
378 goto out_fini;
379 rc = apei_exec_pre_map_gars(&trigger_ctx);
380 if (rc)
381 goto out_release;
382
383 rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);
384
385 apei_exec_post_unmap_gars(&trigger_ctx);
386 out_release:
387 apei_resources_release(&trigger_resources);
388 out_fini:
389 apei_resources_fini(&trigger_resources);
390 out_rel_entry:
391 release_mem_region(trigger_paddr + sizeof(*trigger_tab),
392 table_size - sizeof(*trigger_tab));
393 out_rel_header:
394 release_mem_region(trigger_paddr, sizeof(*trigger_tab));
395 out:
396 if (trigger_tab)
397 iounmap(trigger_tab);
398
399 return rc;
400 }
401
__einj_error_inject(u32 type,u32 flags,u64 param1,u64 param2,u64 param3,u64 param4)402 static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
403 u64 param3, u64 param4)
404 {
405 struct apei_exec_context ctx;
406 u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
407 int rc;
408
409 einj_exec_ctx_init(&ctx);
410
411 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION);
412 if (rc)
413 return rc;
414 apei_exec_ctx_set_input(&ctx, type);
415 if (acpi5) {
416 struct set_error_type_with_address *v5param = einj_param;
417
418 v5param->type = type;
419 if (type & ACPI5_VENDOR_BIT) {
420 switch (vendor_flags) {
421 case SETWA_FLAGS_APICID:
422 v5param->apicid = param1;
423 break;
424 case SETWA_FLAGS_MEM:
425 v5param->memory_address = param1;
426 v5param->memory_address_range = param2;
427 break;
428 case SETWA_FLAGS_PCIE_SBDF:
429 v5param->pcie_sbdf = param1;
430 break;
431 }
432 v5param->flags = vendor_flags;
433 } else if (flags) {
434 v5param->flags = flags;
435 v5param->memory_address = param1;
436 v5param->memory_address_range = param2;
437 v5param->apicid = param3;
438 v5param->pcie_sbdf = param4;
439 } else {
440 switch (type) {
441 case ACPI_EINJ_PROCESSOR_CORRECTABLE:
442 case ACPI_EINJ_PROCESSOR_UNCORRECTABLE:
443 case ACPI_EINJ_PROCESSOR_FATAL:
444 v5param->apicid = param1;
445 v5param->flags = SETWA_FLAGS_APICID;
446 break;
447 case ACPI_EINJ_MEMORY_CORRECTABLE:
448 case ACPI_EINJ_MEMORY_UNCORRECTABLE:
449 case ACPI_EINJ_MEMORY_FATAL:
450 v5param->memory_address = param1;
451 v5param->memory_address_range = param2;
452 v5param->flags = SETWA_FLAGS_MEM;
453 break;
454 case ACPI_EINJ_PCIX_CORRECTABLE:
455 case ACPI_EINJ_PCIX_UNCORRECTABLE:
456 case ACPI_EINJ_PCIX_FATAL:
457 v5param->pcie_sbdf = param1;
458 v5param->flags = SETWA_FLAGS_PCIE_SBDF;
459 break;
460 }
461 }
462 } else {
463 rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
464 if (rc)
465 return rc;
466 if (einj_param) {
467 struct einj_parameter *v4param = einj_param;
468 v4param->param1 = param1;
469 v4param->param2 = param2;
470 }
471 }
472 rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
473 if (rc)
474 return rc;
475 for (;;) {
476 rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
477 if (rc)
478 return rc;
479 val = apei_exec_ctx_get_output(&ctx);
480 if (!(val & EINJ_OP_BUSY))
481 break;
482 if (einj_timedout(&timeout))
483 return -EIO;
484 }
485 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
486 if (rc)
487 return rc;
488 val = apei_exec_ctx_get_output(&ctx);
489 if (val != EINJ_STATUS_SUCCESS)
490 return -EBUSY;
491
492 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
493 if (rc)
494 return rc;
495 trigger_paddr = apei_exec_ctx_get_output(&ctx);
496 if (notrigger == 0) {
497 rc = __einj_error_trigger(trigger_paddr, type, param1, param2);
498 if (rc)
499 return rc;
500 }
501 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION);
502
503 return rc;
504 }
505
506 /* Inject the specified hardware error */
einj_error_inject(u32 type,u32 flags,u64 param1,u64 param2,u64 param3,u64 param4)507 static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
508 u64 param3, u64 param4)
509 {
510 int rc;
511 u64 base_addr, size;
512
513 /* If user manually set "flags", make sure it is legal */
514 if (flags && (flags &
515 ~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF)))
516 return -EINVAL;
517
518 /*
519 * We need extra sanity checks for memory errors.
520 * Other types leap directly to injection.
521 */
522
523 /* ensure param1/param2 existed */
524 if (!(param_extension || acpi5))
525 goto inject;
526
527 /* ensure injection is memory related */
528 if (type & ACPI5_VENDOR_BIT) {
529 if (vendor_flags != SETWA_FLAGS_MEM)
530 goto inject;
531 } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM))
532 goto inject;
533
534 /*
535 * Disallow crazy address masks that give BIOS leeway to pick
536 * injection address almost anywhere. Insist on page or
537 * better granularity and that target address is normal RAM or
538 * NVDIMM.
539 */
540 base_addr = param1 & param2;
541 size = ~param2 + 1;
542
543 if (((param2 & PAGE_MASK) != PAGE_MASK) ||
544 ((region_intersects(base_addr, size, IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE)
545 != REGION_INTERSECTS) &&
546 (region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY)
547 != REGION_INTERSECTS)))
548 return -EINVAL;
549
550 inject:
551 mutex_lock(&einj_mutex);
552 rc = __einj_error_inject(type, flags, param1, param2, param3, param4);
553 mutex_unlock(&einj_mutex);
554
555 return rc;
556 }
557
558 static u32 error_type;
559 static u32 error_flags;
560 static u64 error_param1;
561 static u64 error_param2;
562 static u64 error_param3;
563 static u64 error_param4;
564 static struct dentry *einj_debug_dir;
565
available_error_type_show(struct seq_file * m,void * v)566 static int available_error_type_show(struct seq_file *m, void *v)
567 {
568 int rc;
569 u32 available_error_type = 0;
570
571 rc = einj_get_available_error_type(&available_error_type);
572 if (rc)
573 return rc;
574 if (available_error_type & 0x0001)
575 seq_printf(m, "0x00000001\tProcessor Correctable\n");
576 if (available_error_type & 0x0002)
577 seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n");
578 if (available_error_type & 0x0004)
579 seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n");
580 if (available_error_type & 0x0008)
581 seq_printf(m, "0x00000008\tMemory Correctable\n");
582 if (available_error_type & 0x0010)
583 seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n");
584 if (available_error_type & 0x0020)
585 seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n");
586 if (available_error_type & 0x0040)
587 seq_printf(m, "0x00000040\tPCI Express Correctable\n");
588 if (available_error_type & 0x0080)
589 seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n");
590 if (available_error_type & 0x0100)
591 seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n");
592 if (available_error_type & 0x0200)
593 seq_printf(m, "0x00000200\tPlatform Correctable\n");
594 if (available_error_type & 0x0400)
595 seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n");
596 if (available_error_type & 0x0800)
597 seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n");
598
599 return 0;
600 }
601
602 DEFINE_SHOW_ATTRIBUTE(available_error_type);
603
error_type_get(void * data,u64 * val)604 static int error_type_get(void *data, u64 *val)
605 {
606 *val = error_type;
607
608 return 0;
609 }
610
error_type_set(void * data,u64 val)611 static int error_type_set(void *data, u64 val)
612 {
613 int rc;
614 u32 available_error_type = 0;
615 u32 tval, vendor;
616
617 /*
618 * Vendor defined types have 0x80000000 bit set, and
619 * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE
620 */
621 vendor = val & ACPI5_VENDOR_BIT;
622 tval = val & 0x7fffffff;
623
624 /* Only one error type can be specified */
625 if (tval & (tval - 1))
626 return -EINVAL;
627 if (!vendor) {
628 rc = einj_get_available_error_type(&available_error_type);
629 if (rc)
630 return rc;
631 if (!(val & available_error_type))
632 return -EINVAL;
633 }
634 error_type = val;
635
636 return 0;
637 }
638
639 DEFINE_DEBUGFS_ATTRIBUTE(error_type_fops, error_type_get, error_type_set,
640 "0x%llx\n");
641
error_inject_set(void * data,u64 val)642 static int error_inject_set(void *data, u64 val)
643 {
644 if (!error_type)
645 return -EINVAL;
646
647 return einj_error_inject(error_type, error_flags, error_param1, error_param2,
648 error_param3, error_param4);
649 }
650
651 DEFINE_DEBUGFS_ATTRIBUTE(error_inject_fops, NULL, error_inject_set, "%llu\n");
652
einj_check_table(struct acpi_table_einj * einj_tab)653 static int einj_check_table(struct acpi_table_einj *einj_tab)
654 {
655 if ((einj_tab->header_length !=
656 (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header)))
657 && (einj_tab->header_length != sizeof(struct acpi_table_einj)))
658 return -EINVAL;
659 if (einj_tab->header.length < sizeof(struct acpi_table_einj))
660 return -EINVAL;
661 if (einj_tab->entries !=
662 (einj_tab->header.length - sizeof(struct acpi_table_einj)) /
663 sizeof(struct acpi_einj_entry))
664 return -EINVAL;
665
666 return 0;
667 }
668
einj_init(void)669 static int __init einj_init(void)
670 {
671 int rc;
672 acpi_status status;
673 struct apei_exec_context ctx;
674
675 if (acpi_disabled) {
676 pr_warn("ACPI disabled.\n");
677 return -ENODEV;
678 }
679
680 status = acpi_get_table(ACPI_SIG_EINJ, 0,
681 (struct acpi_table_header **)&einj_tab);
682 if (status == AE_NOT_FOUND) {
683 pr_warn("EINJ table not found.\n");
684 return -ENODEV;
685 }
686 else if (ACPI_FAILURE(status)) {
687 pr_err("Failed to get EINJ table: %s\n",
688 acpi_format_exception(status));
689 return -EINVAL;
690 }
691
692 rc = einj_check_table(einj_tab);
693 if (rc) {
694 pr_warn(FW_BUG "Invalid EINJ table.\n");
695 goto err_put_table;
696 }
697
698 rc = -ENOMEM;
699 einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
700
701 debugfs_create_file("available_error_type", S_IRUSR, einj_debug_dir,
702 NULL, &available_error_type_fops);
703 debugfs_create_file_unsafe("error_type", 0600, einj_debug_dir,
704 NULL, &error_type_fops);
705 debugfs_create_file_unsafe("error_inject", 0200, einj_debug_dir,
706 NULL, &error_inject_fops);
707
708 apei_resources_init(&einj_resources);
709 einj_exec_ctx_init(&ctx);
710 rc = apei_exec_collect_resources(&ctx, &einj_resources);
711 if (rc) {
712 pr_err("Error collecting EINJ resources.\n");
713 goto err_fini;
714 }
715
716 rc = apei_resources_request(&einj_resources, "APEI EINJ");
717 if (rc) {
718 pr_err("Error requesting memory/port resources.\n");
719 goto err_fini;
720 }
721
722 rc = apei_exec_pre_map_gars(&ctx);
723 if (rc) {
724 pr_err("Error pre-mapping GARs.\n");
725 goto err_release;
726 }
727
728 einj_param = einj_get_parameter_address();
729 if ((param_extension || acpi5) && einj_param) {
730 debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir,
731 &error_flags);
732 debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir,
733 &error_param1);
734 debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir,
735 &error_param2);
736 debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir,
737 &error_param3);
738 debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir,
739 &error_param4);
740 debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
741 einj_debug_dir, ¬rigger);
742 }
743
744 if (vendor_dev[0]) {
745 vendor_blob.data = vendor_dev;
746 vendor_blob.size = strlen(vendor_dev);
747 debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir,
748 &vendor_blob);
749 debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
750 einj_debug_dir, &vendor_flags);
751 }
752
753 pr_info("Error INJection is initialized.\n");
754
755 return 0;
756
757 err_release:
758 apei_resources_release(&einj_resources);
759 err_fini:
760 apei_resources_fini(&einj_resources);
761 debugfs_remove_recursive(einj_debug_dir);
762 err_put_table:
763 acpi_put_table((struct acpi_table_header *)einj_tab);
764
765 return rc;
766 }
767
einj_exit(void)768 static void __exit einj_exit(void)
769 {
770 struct apei_exec_context ctx;
771
772 if (einj_param) {
773 acpi_size size = (acpi5) ?
774 sizeof(struct set_error_type_with_address) :
775 sizeof(struct einj_parameter);
776
777 acpi_os_unmap_iomem(einj_param, size);
778 }
779 einj_exec_ctx_init(&ctx);
780 apei_exec_post_unmap_gars(&ctx);
781 apei_resources_release(&einj_resources);
782 apei_resources_fini(&einj_resources);
783 debugfs_remove_recursive(einj_debug_dir);
784 acpi_put_table((struct acpi_table_header *)einj_tab);
785 }
786
787 module_init(einj_init);
788 module_exit(einj_exit);
789
790 MODULE_AUTHOR("Huang Ying");
791 MODULE_DESCRIPTION("APEI Error INJection support");
792 MODULE_LICENSE("GPL");
793