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 SLEEP_UNIT_MIN 1000 /* 1ms */
32 #define SLEEP_UNIT_MAX 5000 /* 5ms */
33 /* Firmware should respond within 1 seconds */
34 #define FIRMWARE_TIMEOUT (1 * USEC_PER_SEC)
35 #define ACPI5_VENDOR_BIT BIT(31)
36 #define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \
37 ACPI_EINJ_MEMORY_UNCORRECTABLE | \
38 ACPI_EINJ_MEMORY_FATAL)
39
40 /*
41 * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action.
42 */
43 static int acpi5;
44
45 struct set_error_type_with_address {
46 u32 type;
47 u32 vendor_extension;
48 u32 flags;
49 u32 apicid;
50 u64 memory_address;
51 u64 memory_address_range;
52 u32 pcie_sbdf;
53 };
54 enum {
55 SETWA_FLAGS_APICID = 1,
56 SETWA_FLAGS_MEM = 2,
57 SETWA_FLAGS_PCIE_SBDF = 4,
58 };
59
60 /*
61 * Vendor extensions for platform specific operations
62 */
63 struct vendor_error_type_extension {
64 u32 length;
65 u32 pcie_sbdf;
66 u16 vendor_id;
67 u16 device_id;
68 u8 rev_id;
69 u8 reserved[3];
70 };
71
72 static u32 notrigger;
73
74 static u32 vendor_flags;
75 static struct debugfs_blob_wrapper vendor_blob;
76 static char vendor_dev[64];
77
78 /*
79 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
80 * EINJ table through an unpublished extension. Use with caution as
81 * most will ignore the parameter and make their own choice of address
82 * for error injection. This extension is used only if
83 * param_extension module parameter is specified.
84 */
85 struct einj_parameter {
86 u64 type;
87 u64 reserved1;
88 u64 reserved2;
89 u64 param1;
90 u64 param2;
91 };
92
93 #define EINJ_OP_BUSY 0x1
94 #define EINJ_STATUS_SUCCESS 0x0
95 #define EINJ_STATUS_FAIL 0x1
96 #define EINJ_STATUS_INVAL 0x2
97
98 #define EINJ_TAB_ENTRY(tab) \
99 ((struct acpi_whea_header *)((char *)(tab) + \
100 sizeof(struct acpi_table_einj)))
101
102 static bool param_extension;
103 module_param(param_extension, bool, 0);
104
105 static struct acpi_table_einj *einj_tab;
106
107 static struct apei_resources einj_resources;
108
109 static struct apei_exec_ins_type einj_ins_type[] = {
110 [ACPI_EINJ_READ_REGISTER] = {
111 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
112 .run = apei_exec_read_register,
113 },
114 [ACPI_EINJ_READ_REGISTER_VALUE] = {
115 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
116 .run = apei_exec_read_register_value,
117 },
118 [ACPI_EINJ_WRITE_REGISTER] = {
119 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
120 .run = apei_exec_write_register,
121 },
122 [ACPI_EINJ_WRITE_REGISTER_VALUE] = {
123 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
124 .run = apei_exec_write_register_value,
125 },
126 [ACPI_EINJ_NOOP] = {
127 .flags = 0,
128 .run = apei_exec_noop,
129 },
130 };
131
132 /*
133 * Prevent EINJ interpreter to run simultaneously, because the
134 * corresponding firmware implementation may not work properly when
135 * invoked simultaneously.
136 */
137 static DEFINE_MUTEX(einj_mutex);
138
139 static void *einj_param;
140
einj_exec_ctx_init(struct apei_exec_context * ctx)141 static void einj_exec_ctx_init(struct apei_exec_context *ctx)
142 {
143 apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
144 EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
145 }
146
__einj_get_available_error_type(u32 * type)147 static int __einj_get_available_error_type(u32 *type)
148 {
149 struct apei_exec_context ctx;
150 int rc;
151
152 einj_exec_ctx_init(&ctx);
153 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
154 if (rc)
155 return rc;
156 *type = apei_exec_ctx_get_output(&ctx);
157
158 return 0;
159 }
160
161 /* Get error injection capabilities of the platform */
einj_get_available_error_type(u32 * type)162 static int einj_get_available_error_type(u32 *type)
163 {
164 int rc;
165
166 mutex_lock(&einj_mutex);
167 rc = __einj_get_available_error_type(type);
168 mutex_unlock(&einj_mutex);
169
170 return rc;
171 }
172
einj_timedout(u64 * t)173 static int einj_timedout(u64 *t)
174 {
175 if ((s64)*t < SLEEP_UNIT_MIN) {
176 pr_warn(FW_WARN "Firmware does not respond in time\n");
177 return 1;
178 }
179 *t -= SLEEP_UNIT_MIN;
180 usleep_range(SLEEP_UNIT_MIN, SLEEP_UNIT_MAX);
181
182 return 0;
183 }
184
check_vendor_extension(u64 paddr,struct set_error_type_with_address * v5param)185 static void check_vendor_extension(u64 paddr,
186 struct set_error_type_with_address *v5param)
187 {
188 int offset = v5param->vendor_extension;
189 struct vendor_error_type_extension *v;
190 u32 sbdf;
191
192 if (!offset)
193 return;
194 v = acpi_os_map_iomem(paddr + offset, sizeof(*v));
195 if (!v)
196 return;
197 sbdf = v->pcie_sbdf;
198 sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n",
199 sbdf >> 24, (sbdf >> 16) & 0xff,
200 (sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7,
201 v->vendor_id, v->device_id, v->rev_id);
202 acpi_os_unmap_iomem(v, sizeof(*v));
203 }
204
einj_get_parameter_address(void)205 static void *einj_get_parameter_address(void)
206 {
207 int i;
208 u64 pa_v4 = 0, pa_v5 = 0;
209 struct acpi_whea_header *entry;
210
211 entry = EINJ_TAB_ENTRY(einj_tab);
212 for (i = 0; i < einj_tab->entries; i++) {
213 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
214 entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
215 entry->register_region.space_id ==
216 ACPI_ADR_SPACE_SYSTEM_MEMORY)
217 pa_v4 = get_unaligned(&entry->register_region.address);
218 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
219 entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
220 entry->register_region.space_id ==
221 ACPI_ADR_SPACE_SYSTEM_MEMORY)
222 pa_v5 = get_unaligned(&entry->register_region.address);
223 entry++;
224 }
225 if (pa_v5) {
226 struct set_error_type_with_address *v5param;
227
228 v5param = acpi_os_map_iomem(pa_v5, sizeof(*v5param));
229 if (v5param) {
230 acpi5 = 1;
231 check_vendor_extension(pa_v5, v5param);
232 return v5param;
233 }
234 }
235 if (param_extension && pa_v4) {
236 struct einj_parameter *v4param;
237
238 v4param = acpi_os_map_iomem(pa_v4, sizeof(*v4param));
239 if (!v4param)
240 return NULL;
241 if (v4param->reserved1 || v4param->reserved2) {
242 acpi_os_unmap_iomem(v4param, sizeof(*v4param));
243 return NULL;
244 }
245 return v4param;
246 }
247
248 return NULL;
249 }
250
251 /* do sanity check to trigger table */
einj_check_trigger_header(struct acpi_einj_trigger * trigger_tab)252 static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
253 {
254 if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
255 return -EINVAL;
256 if (trigger_tab->table_size > PAGE_SIZE ||
257 trigger_tab->table_size < trigger_tab->header_size)
258 return -EINVAL;
259 if (trigger_tab->entry_count !=
260 (trigger_tab->table_size - trigger_tab->header_size) /
261 sizeof(struct acpi_einj_entry))
262 return -EINVAL;
263
264 return 0;
265 }
266
einj_get_trigger_parameter_region(struct acpi_einj_trigger * trigger_tab,u64 param1,u64 param2)267 static struct acpi_generic_address *einj_get_trigger_parameter_region(
268 struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2)
269 {
270 int i;
271 struct acpi_whea_header *entry;
272
273 entry = (struct acpi_whea_header *)
274 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
275 for (i = 0; i < trigger_tab->entry_count; i++) {
276 if (entry->action == ACPI_EINJ_TRIGGER_ERROR &&
277 entry->instruction <= ACPI_EINJ_WRITE_REGISTER_VALUE &&
278 entry->register_region.space_id ==
279 ACPI_ADR_SPACE_SYSTEM_MEMORY &&
280 (entry->register_region.address & param2) == (param1 & param2))
281 return &entry->register_region;
282 entry++;
283 }
284
285 return NULL;
286 }
287 /* Execute instructions in trigger error action table */
__einj_error_trigger(u64 trigger_paddr,u32 type,u64 param1,u64 param2)288 static int __einj_error_trigger(u64 trigger_paddr, u32 type,
289 u64 param1, u64 param2)
290 {
291 struct acpi_einj_trigger *trigger_tab = NULL;
292 struct apei_exec_context trigger_ctx;
293 struct apei_resources trigger_resources;
294 struct acpi_whea_header *trigger_entry;
295 struct resource *r;
296 u32 table_size;
297 int rc = -EIO;
298 struct acpi_generic_address *trigger_param_region = NULL;
299
300 r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
301 "APEI EINJ Trigger Table");
302 if (!r) {
303 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger table\n",
304 (unsigned long long)trigger_paddr,
305 (unsigned long long)trigger_paddr +
306 sizeof(*trigger_tab) - 1);
307 goto out;
308 }
309 trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
310 if (!trigger_tab) {
311 pr_err("Failed to map trigger table!\n");
312 goto out_rel_header;
313 }
314 rc = einj_check_trigger_header(trigger_tab);
315 if (rc) {
316 pr_warn(FW_BUG "Invalid trigger error action table.\n");
317 goto out_rel_header;
318 }
319
320 /* No action structures in the TRIGGER_ERROR table, nothing to do */
321 if (!trigger_tab->entry_count)
322 goto out_rel_header;
323
324 rc = -EIO;
325 table_size = trigger_tab->table_size;
326 r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
327 table_size - sizeof(*trigger_tab),
328 "APEI EINJ Trigger Table");
329 if (!r) {
330 pr_err("Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n",
331 (unsigned long long)trigger_paddr + sizeof(*trigger_tab),
332 (unsigned long long)trigger_paddr + table_size - 1);
333 goto out_rel_header;
334 }
335 iounmap(trigger_tab);
336 trigger_tab = ioremap_cache(trigger_paddr, table_size);
337 if (!trigger_tab) {
338 pr_err("Failed to map trigger table!\n");
339 goto out_rel_entry;
340 }
341 trigger_entry = (struct acpi_whea_header *)
342 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
343 apei_resources_init(&trigger_resources);
344 apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
345 ARRAY_SIZE(einj_ins_type),
346 trigger_entry, trigger_tab->entry_count);
347 rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
348 if (rc)
349 goto out_fini;
350 rc = apei_resources_sub(&trigger_resources, &einj_resources);
351 if (rc)
352 goto out_fini;
353 /*
354 * Some firmware will access target address specified in
355 * param1 to trigger the error when injecting memory error.
356 * This will cause resource conflict with regular memory. So
357 * remove it from trigger table resources.
358 */
359 if ((param_extension || acpi5) && (type & MEM_ERROR_MASK) && param2) {
360 struct apei_resources addr_resources;
361 apei_resources_init(&addr_resources);
362 trigger_param_region = einj_get_trigger_parameter_region(
363 trigger_tab, param1, param2);
364 if (trigger_param_region) {
365 rc = apei_resources_add(&addr_resources,
366 trigger_param_region->address,
367 trigger_param_region->bit_width/8, true);
368 if (rc)
369 goto out_fini;
370 rc = apei_resources_sub(&trigger_resources,
371 &addr_resources);
372 }
373 apei_resources_fini(&addr_resources);
374 if (rc)
375 goto out_fini;
376 }
377 rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
378 if (rc)
379 goto out_fini;
380 rc = apei_exec_pre_map_gars(&trigger_ctx);
381 if (rc)
382 goto out_release;
383
384 rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);
385
386 apei_exec_post_unmap_gars(&trigger_ctx);
387 out_release:
388 apei_resources_release(&trigger_resources);
389 out_fini:
390 apei_resources_fini(&trigger_resources);
391 out_rel_entry:
392 release_mem_region(trigger_paddr + sizeof(*trigger_tab),
393 table_size - sizeof(*trigger_tab));
394 out_rel_header:
395 release_mem_region(trigger_paddr, sizeof(*trigger_tab));
396 out:
397 if (trigger_tab)
398 iounmap(trigger_tab);
399
400 return rc;
401 }
402
__einj_error_inject(u32 type,u32 flags,u64 param1,u64 param2,u64 param3,u64 param4)403 static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
404 u64 param3, u64 param4)
405 {
406 struct apei_exec_context ctx;
407 u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
408 int rc;
409
410 einj_exec_ctx_init(&ctx);
411
412 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION);
413 if (rc)
414 return rc;
415 apei_exec_ctx_set_input(&ctx, type);
416 if (acpi5) {
417 struct set_error_type_with_address *v5param = einj_param;
418
419 v5param->type = type;
420 if (type & ACPI5_VENDOR_BIT) {
421 switch (vendor_flags) {
422 case SETWA_FLAGS_APICID:
423 v5param->apicid = param1;
424 break;
425 case SETWA_FLAGS_MEM:
426 v5param->memory_address = param1;
427 v5param->memory_address_range = param2;
428 break;
429 case SETWA_FLAGS_PCIE_SBDF:
430 v5param->pcie_sbdf = param1;
431 break;
432 }
433 v5param->flags = vendor_flags;
434 } else if (flags) {
435 v5param->flags = flags;
436 v5param->memory_address = param1;
437 v5param->memory_address_range = param2;
438 v5param->apicid = param3;
439 v5param->pcie_sbdf = param4;
440 } else {
441 switch (type) {
442 case ACPI_EINJ_PROCESSOR_CORRECTABLE:
443 case ACPI_EINJ_PROCESSOR_UNCORRECTABLE:
444 case ACPI_EINJ_PROCESSOR_FATAL:
445 v5param->apicid = param1;
446 v5param->flags = SETWA_FLAGS_APICID;
447 break;
448 case ACPI_EINJ_MEMORY_CORRECTABLE:
449 case ACPI_EINJ_MEMORY_UNCORRECTABLE:
450 case ACPI_EINJ_MEMORY_FATAL:
451 v5param->memory_address = param1;
452 v5param->memory_address_range = param2;
453 v5param->flags = SETWA_FLAGS_MEM;
454 break;
455 case ACPI_EINJ_PCIX_CORRECTABLE:
456 case ACPI_EINJ_PCIX_UNCORRECTABLE:
457 case ACPI_EINJ_PCIX_FATAL:
458 v5param->pcie_sbdf = param1;
459 v5param->flags = SETWA_FLAGS_PCIE_SBDF;
460 break;
461 }
462 }
463 } else {
464 rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
465 if (rc)
466 return rc;
467 if (einj_param) {
468 struct einj_parameter *v4param = einj_param;
469 v4param->param1 = param1;
470 v4param->param2 = param2;
471 }
472 }
473 rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
474 if (rc)
475 return rc;
476 for (;;) {
477 rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
478 if (rc)
479 return rc;
480 val = apei_exec_ctx_get_output(&ctx);
481 if (!(val & EINJ_OP_BUSY))
482 break;
483 if (einj_timedout(&timeout))
484 return -EIO;
485 }
486 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
487 if (rc)
488 return rc;
489 val = apei_exec_ctx_get_output(&ctx);
490 if (val != EINJ_STATUS_SUCCESS)
491 return -EBUSY;
492
493 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
494 if (rc)
495 return rc;
496 trigger_paddr = apei_exec_ctx_get_output(&ctx);
497 if (notrigger == 0) {
498 rc = __einj_error_trigger(trigger_paddr, type, param1, param2);
499 if (rc)
500 return rc;
501 }
502 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION);
503
504 return rc;
505 }
506
507 /* Inject the specified hardware error */
einj_error_inject(u32 type,u32 flags,u64 param1,u64 param2,u64 param3,u64 param4)508 static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
509 u64 param3, u64 param4)
510 {
511 int rc;
512 u64 base_addr, size;
513
514 /* If user manually set "flags", make sure it is legal */
515 if (flags && (flags &
516 ~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF)))
517 return -EINVAL;
518
519 /*
520 * We need extra sanity checks for memory errors.
521 * Other types leap directly to injection.
522 */
523
524 /* ensure param1/param2 existed */
525 if (!(param_extension || acpi5))
526 goto inject;
527
528 /* ensure injection is memory related */
529 if (type & ACPI5_VENDOR_BIT) {
530 if (vendor_flags != SETWA_FLAGS_MEM)
531 goto inject;
532 } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM))
533 goto inject;
534
535 /*
536 * Disallow crazy address masks that give BIOS leeway to pick
537 * injection address almost anywhere. Insist on page or
538 * better granularity and that target address is normal RAM or
539 * NVDIMM.
540 */
541 base_addr = param1 & param2;
542 size = ~param2 + 1;
543
544 if (((param2 & PAGE_MASK) != PAGE_MASK) ||
545 ((region_intersects(base_addr, size, IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE)
546 != REGION_INTERSECTS) &&
547 (region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_PERSISTENT_MEMORY)
548 != REGION_INTERSECTS) &&
549 (region_intersects(base_addr, size, IORESOURCE_MEM, IORES_DESC_SOFT_RESERVED)
550 != REGION_INTERSECTS) &&
551 !arch_is_platform_page(base_addr)))
552 return -EINVAL;
553
554 if (is_zero_pfn(base_addr >> PAGE_SHIFT))
555 return -EADDRINUSE;
556
557 inject:
558 mutex_lock(&einj_mutex);
559 rc = __einj_error_inject(type, flags, param1, param2, param3, param4);
560 mutex_unlock(&einj_mutex);
561
562 return rc;
563 }
564
565 static u32 error_type;
566 static u32 error_flags;
567 static u64 error_param1;
568 static u64 error_param2;
569 static u64 error_param3;
570 static u64 error_param4;
571 static struct dentry *einj_debug_dir;
572
available_error_type_show(struct seq_file * m,void * v)573 static int available_error_type_show(struct seq_file *m, void *v)
574 {
575 int rc;
576 u32 available_error_type = 0;
577
578 rc = einj_get_available_error_type(&available_error_type);
579 if (rc)
580 return rc;
581 if (available_error_type & 0x0001)
582 seq_printf(m, "0x00000001\tProcessor Correctable\n");
583 if (available_error_type & 0x0002)
584 seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n");
585 if (available_error_type & 0x0004)
586 seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n");
587 if (available_error_type & 0x0008)
588 seq_printf(m, "0x00000008\tMemory Correctable\n");
589 if (available_error_type & 0x0010)
590 seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n");
591 if (available_error_type & 0x0020)
592 seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n");
593 if (available_error_type & 0x0040)
594 seq_printf(m, "0x00000040\tPCI Express Correctable\n");
595 if (available_error_type & 0x0080)
596 seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n");
597 if (available_error_type & 0x0100)
598 seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n");
599 if (available_error_type & 0x0200)
600 seq_printf(m, "0x00000200\tPlatform Correctable\n");
601 if (available_error_type & 0x0400)
602 seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n");
603 if (available_error_type & 0x0800)
604 seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n");
605
606 return 0;
607 }
608
609 DEFINE_SHOW_ATTRIBUTE(available_error_type);
610
error_type_get(void * data,u64 * val)611 static int error_type_get(void *data, u64 *val)
612 {
613 *val = error_type;
614
615 return 0;
616 }
617
error_type_set(void * data,u64 val)618 static int error_type_set(void *data, u64 val)
619 {
620 int rc;
621 u32 available_error_type = 0;
622 u32 tval, vendor;
623
624 /*
625 * Vendor defined types have 0x80000000 bit set, and
626 * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE
627 */
628 vendor = val & ACPI5_VENDOR_BIT;
629 tval = val & 0x7fffffff;
630
631 /* Only one error type can be specified */
632 if (tval & (tval - 1))
633 return -EINVAL;
634 if (!vendor) {
635 rc = einj_get_available_error_type(&available_error_type);
636 if (rc)
637 return rc;
638 if (!(val & available_error_type))
639 return -EINVAL;
640 }
641 error_type = val;
642
643 return 0;
644 }
645
646 DEFINE_DEBUGFS_ATTRIBUTE(error_type_fops, error_type_get, error_type_set,
647 "0x%llx\n");
648
error_inject_set(void * data,u64 val)649 static int error_inject_set(void *data, u64 val)
650 {
651 if (!error_type)
652 return -EINVAL;
653
654 return einj_error_inject(error_type, error_flags, error_param1, error_param2,
655 error_param3, error_param4);
656 }
657
658 DEFINE_DEBUGFS_ATTRIBUTE(error_inject_fops, NULL, error_inject_set, "%llu\n");
659
einj_check_table(struct acpi_table_einj * einj_tab)660 static int einj_check_table(struct acpi_table_einj *einj_tab)
661 {
662 if ((einj_tab->header_length !=
663 (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header)))
664 && (einj_tab->header_length != sizeof(struct acpi_table_einj)))
665 return -EINVAL;
666 if (einj_tab->header.length < sizeof(struct acpi_table_einj))
667 return -EINVAL;
668 if (einj_tab->entries !=
669 (einj_tab->header.length - sizeof(struct acpi_table_einj)) /
670 sizeof(struct acpi_einj_entry))
671 return -EINVAL;
672
673 return 0;
674 }
675
einj_init(void)676 static int __init einj_init(void)
677 {
678 int rc;
679 acpi_status status;
680 struct apei_exec_context ctx;
681
682 if (acpi_disabled) {
683 pr_info("ACPI disabled.\n");
684 return -ENODEV;
685 }
686
687 status = acpi_get_table(ACPI_SIG_EINJ, 0,
688 (struct acpi_table_header **)&einj_tab);
689 if (status == AE_NOT_FOUND) {
690 pr_warn("EINJ table not found.\n");
691 return -ENODEV;
692 }
693 else if (ACPI_FAILURE(status)) {
694 pr_err("Failed to get EINJ table: %s\n",
695 acpi_format_exception(status));
696 return -EINVAL;
697 }
698
699 rc = einj_check_table(einj_tab);
700 if (rc) {
701 pr_warn(FW_BUG "Invalid EINJ table.\n");
702 goto err_put_table;
703 }
704
705 rc = -ENOMEM;
706 einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
707
708 debugfs_create_file("available_error_type", S_IRUSR, einj_debug_dir,
709 NULL, &available_error_type_fops);
710 debugfs_create_file_unsafe("error_type", 0600, einj_debug_dir,
711 NULL, &error_type_fops);
712 debugfs_create_file_unsafe("error_inject", 0200, einj_debug_dir,
713 NULL, &error_inject_fops);
714
715 apei_resources_init(&einj_resources);
716 einj_exec_ctx_init(&ctx);
717 rc = apei_exec_collect_resources(&ctx, &einj_resources);
718 if (rc) {
719 pr_err("Error collecting EINJ resources.\n");
720 goto err_fini;
721 }
722
723 rc = apei_resources_request(&einj_resources, "APEI EINJ");
724 if (rc) {
725 pr_err("Error requesting memory/port resources.\n");
726 goto err_fini;
727 }
728
729 rc = apei_exec_pre_map_gars(&ctx);
730 if (rc) {
731 pr_err("Error pre-mapping GARs.\n");
732 goto err_release;
733 }
734
735 einj_param = einj_get_parameter_address();
736 if ((param_extension || acpi5) && einj_param) {
737 debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir,
738 &error_flags);
739 debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir,
740 &error_param1);
741 debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir,
742 &error_param2);
743 debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir,
744 &error_param3);
745 debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir,
746 &error_param4);
747 debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
748 einj_debug_dir, ¬rigger);
749 }
750
751 if (vendor_dev[0]) {
752 vendor_blob.data = vendor_dev;
753 vendor_blob.size = strlen(vendor_dev);
754 debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir,
755 &vendor_blob);
756 debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
757 einj_debug_dir, &vendor_flags);
758 }
759
760 pr_info("Error INJection is initialized.\n");
761
762 return 0;
763
764 err_release:
765 apei_resources_release(&einj_resources);
766 err_fini:
767 apei_resources_fini(&einj_resources);
768 debugfs_remove_recursive(einj_debug_dir);
769 err_put_table:
770 acpi_put_table((struct acpi_table_header *)einj_tab);
771
772 return rc;
773 }
774
einj_exit(void)775 static void __exit einj_exit(void)
776 {
777 struct apei_exec_context ctx;
778
779 if (einj_param) {
780 acpi_size size = (acpi5) ?
781 sizeof(struct set_error_type_with_address) :
782 sizeof(struct einj_parameter);
783
784 acpi_os_unmap_iomem(einj_param, size);
785 }
786 einj_exec_ctx_init(&ctx);
787 apei_exec_post_unmap_gars(&ctx);
788 apei_resources_release(&einj_resources);
789 apei_resources_fini(&einj_resources);
790 debugfs_remove_recursive(einj_debug_dir);
791 acpi_put_table((struct acpi_table_header *)einj_tab);
792 }
793
794 module_init(einj_init);
795 module_exit(einj_exit);
796
797 MODULE_AUTHOR("Huang Ying");
798 MODULE_DESCRIPTION("APEI Error INJection support");
799 MODULE_LICENSE("GPL");
800