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ACPI, APEI, EINJ, cleanup 0 vs NULL confusion
[deliverable/linux.git] / drivers / acpi / apei / einj.c
1 /*
2 * APEI Error INJection support
3 *
4 * EINJ provides a hardware error injection mechanism, this is useful
5 * for debugging and testing of other APEI and RAS features.
6 *
7 * For more information about EINJ, please refer to ACPI Specification
8 * version 4.0, section 17.5.
9 *
10 * Copyright 2009-2010 Intel Corp.
11 * Author: Huang Ying <ying.huang@intel.com>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License version
15 * 2 as published by the Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/io.h>
31 #include <linux/debugfs.h>
32 #include <linux/seq_file.h>
33 #include <linux/nmi.h>
34 #include <linux/delay.h>
35 #include <acpi/acpi.h>
36
37 #include "apei-internal.h"
38
39 #define EINJ_PFX "EINJ: "
40
41 #define SPIN_UNIT 100 /* 100ns */
42 /* Firmware should respond within 1 milliseconds */
43 #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
44
45 /*
46 * ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action.
47 */
48 static int acpi5;
49
50 struct set_error_type_with_address {
51 u32 type;
52 u32 vendor_extension;
53 u32 flags;
54 u32 apicid;
55 u64 memory_address;
56 u64 memory_address_range;
57 u32 pcie_sbdf;
58 };
59 enum {
60 SETWA_FLAGS_APICID = 1,
61 SETWA_FLAGS_MEM = 2,
62 SETWA_FLAGS_PCIE_SBDF = 4,
63 };
64
65 /*
66 * Vendor extensions for platform specific operations
67 */
68 struct vendor_error_type_extension {
69 u32 length;
70 u32 pcie_sbdf;
71 u16 vendor_id;
72 u16 device_id;
73 u8 rev_id;
74 u8 reserved[3];
75 };
76
77 static u32 vendor_flags;
78 static struct debugfs_blob_wrapper vendor_blob;
79 static char vendor_dev[64];
80
81 /*
82 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
83 * EINJ table through an unpublished extension. Use with caution as
84 * most will ignore the parameter and make their own choice of address
85 * for error injection. This extension is used only if
86 * param_extension module parameter is specified.
87 */
88 struct einj_parameter {
89 u64 type;
90 u64 reserved1;
91 u64 reserved2;
92 u64 param1;
93 u64 param2;
94 };
95
96 #define EINJ_OP_BUSY 0x1
97 #define EINJ_STATUS_SUCCESS 0x0
98 #define EINJ_STATUS_FAIL 0x1
99 #define EINJ_STATUS_INVAL 0x2
100
101 #define EINJ_TAB_ENTRY(tab) \
102 ((struct acpi_whea_header *)((char *)(tab) + \
103 sizeof(struct acpi_table_einj)))
104
105 static bool param_extension;
106 module_param(param_extension, bool, 0);
107
108 static struct acpi_table_einj *einj_tab;
109
110 static struct apei_resources einj_resources;
111
112 static struct apei_exec_ins_type einj_ins_type[] = {
113 [ACPI_EINJ_READ_REGISTER] = {
114 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
115 .run = apei_exec_read_register,
116 },
117 [ACPI_EINJ_READ_REGISTER_VALUE] = {
118 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
119 .run = apei_exec_read_register_value,
120 },
121 [ACPI_EINJ_WRITE_REGISTER] = {
122 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
123 .run = apei_exec_write_register,
124 },
125 [ACPI_EINJ_WRITE_REGISTER_VALUE] = {
126 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
127 .run = apei_exec_write_register_value,
128 },
129 [ACPI_EINJ_NOOP] = {
130 .flags = 0,
131 .run = apei_exec_noop,
132 },
133 };
134
135 /*
136 * Prevent EINJ interpreter to run simultaneously, because the
137 * corresponding firmware implementation may not work properly when
138 * invoked simultaneously.
139 */
140 static DEFINE_MUTEX(einj_mutex);
141
142 static void *einj_param;
143
144 #ifndef readq
145 static inline __u64 readq(volatile void __iomem *addr)
146 {
147 return ((__u64)readl(addr+4) << 32) + readl(addr);
148 }
149 #endif
150
151 #ifndef writeq
152 static inline void writeq(__u64 val, volatile void __iomem *addr)
153 {
154 writel(val, addr);
155 writel(val >> 32, addr+4);
156 }
157 #endif
158
159 static void einj_exec_ctx_init(struct apei_exec_context *ctx)
160 {
161 apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
162 EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
163 }
164
165 static int __einj_get_available_error_type(u32 *type)
166 {
167 struct apei_exec_context ctx;
168 int rc;
169
170 einj_exec_ctx_init(&ctx);
171 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
172 if (rc)
173 return rc;
174 *type = apei_exec_ctx_get_output(&ctx);
175
176 return 0;
177 }
178
179 /* Get error injection capabilities of the platform */
180 static int einj_get_available_error_type(u32 *type)
181 {
182 int rc;
183
184 mutex_lock(&einj_mutex);
185 rc = __einj_get_available_error_type(type);
186 mutex_unlock(&einj_mutex);
187
188 return rc;
189 }
190
191 static int einj_timedout(u64 *t)
192 {
193 if ((s64)*t < SPIN_UNIT) {
194 pr_warning(FW_WARN EINJ_PFX
195 "Firmware does not respond in time\n");
196 return 1;
197 }
198 *t -= SPIN_UNIT;
199 ndelay(SPIN_UNIT);
200 touch_nmi_watchdog();
201 return 0;
202 }
203
204 static void check_vendor_extension(u64 paddr,
205 struct set_error_type_with_address *v5param)
206 {
207 int offset = readl(&v5param->vendor_extension);
208 struct vendor_error_type_extension *v;
209 u32 sbdf;
210
211 if (!offset)
212 return;
213 v = ioremap(paddr + offset, sizeof(*v));
214 if (!v)
215 return;
216 sbdf = readl(&v->pcie_sbdf);
217 sprintf(vendor_dev, "%x:%x:%x.%x vendor_id=%x device_id=%x rev_id=%x\n",
218 sbdf >> 24, (sbdf >> 16) & 0xff,
219 (sbdf >> 11) & 0x1f, (sbdf >> 8) & 0x7,
220 readw(&v->vendor_id), readw(&v->device_id),
221 readb(&v->rev_id));
222 iounmap(v);
223 }
224
225 static void *einj_get_parameter_address(void)
226 {
227 int i;
228 u64 paddrv4 = 0, paddrv5 = 0;
229 struct acpi_whea_header *entry;
230
231 entry = EINJ_TAB_ENTRY(einj_tab);
232 for (i = 0; i < einj_tab->entries; i++) {
233 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
234 entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
235 entry->register_region.space_id ==
236 ACPI_ADR_SPACE_SYSTEM_MEMORY)
237 memcpy(&paddrv4, &entry->register_region.address,
238 sizeof(paddrv4));
239 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE_WITH_ADDRESS &&
240 entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
241 entry->register_region.space_id ==
242 ACPI_ADR_SPACE_SYSTEM_MEMORY)
243 memcpy(&paddrv5, &entry->register_region.address,
244 sizeof(paddrv5));
245 entry++;
246 }
247 if (paddrv5) {
248 struct set_error_type_with_address *v5param;
249
250 v5param = ioremap(paddrv5, sizeof(*v5param));
251 if (v5param) {
252 acpi5 = 1;
253 check_vendor_extension(paddrv5, v5param);
254 return v5param;
255 }
256 }
257 if (paddrv4) {
258 struct einj_parameter *v4param;
259
260 v4param = ioremap(paddrv4, sizeof(*v4param));
261 if (!v4param)
262 return NULL;
263 if (readq(&v4param->reserved1) || readq(&v4param->reserved2)) {
264 iounmap(v4param);
265 return NULL;
266 }
267 return v4param;
268 }
269
270 return NULL;
271 }
272
273 /* do sanity check to trigger table */
274 static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
275 {
276 if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
277 return -EINVAL;
278 if (trigger_tab->table_size > PAGE_SIZE ||
279 trigger_tab->table_size < trigger_tab->header_size)
280 return -EINVAL;
281 if (trigger_tab->entry_count !=
282 (trigger_tab->table_size - trigger_tab->header_size) /
283 sizeof(struct acpi_einj_entry))
284 return -EINVAL;
285
286 return 0;
287 }
288
289 static struct acpi_generic_address *einj_get_trigger_parameter_region(
290 struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2)
291 {
292 int i;
293 struct acpi_whea_header *entry;
294
295 entry = (struct acpi_whea_header *)
296 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
297 for (i = 0; i < trigger_tab->entry_count; i++) {
298 if (entry->action == ACPI_EINJ_TRIGGER_ERROR &&
299 entry->instruction == ACPI_EINJ_WRITE_REGISTER_VALUE &&
300 entry->register_region.space_id ==
301 ACPI_ADR_SPACE_SYSTEM_MEMORY &&
302 (entry->register_region.address & param2) == (param1 & param2))
303 return &entry->register_region;
304 entry++;
305 }
306
307 return NULL;
308 }
309 /* Execute instructions in trigger error action table */
310 static int __einj_error_trigger(u64 trigger_paddr, u32 type,
311 u64 param1, u64 param2)
312 {
313 struct acpi_einj_trigger *trigger_tab = NULL;
314 struct apei_exec_context trigger_ctx;
315 struct apei_resources trigger_resources;
316 struct acpi_whea_header *trigger_entry;
317 struct resource *r;
318 u32 table_size;
319 int rc = -EIO;
320 struct acpi_generic_address *trigger_param_region = NULL;
321
322 r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
323 "APEI EINJ Trigger Table");
324 if (!r) {
325 pr_err(EINJ_PFX
326 "Can not request [mem %#010llx-%#010llx] for Trigger table\n",
327 (unsigned long long)trigger_paddr,
328 (unsigned long long)trigger_paddr +
329 sizeof(*trigger_tab) - 1);
330 goto out;
331 }
332 trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
333 if (!trigger_tab) {
334 pr_err(EINJ_PFX "Failed to map trigger table!\n");
335 goto out_rel_header;
336 }
337 rc = einj_check_trigger_header(trigger_tab);
338 if (rc) {
339 pr_warning(FW_BUG EINJ_PFX
340 "The trigger error action table is invalid\n");
341 goto out_rel_header;
342 }
343
344 /* No action structures in the TRIGGER_ERROR table, nothing to do */
345 if (!trigger_tab->entry_count)
346 goto out_rel_header;
347
348 rc = -EIO;
349 table_size = trigger_tab->table_size;
350 r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
351 table_size - sizeof(*trigger_tab),
352 "APEI EINJ Trigger Table");
353 if (!r) {
354 pr_err(EINJ_PFX
355 "Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n",
356 (unsigned long long)trigger_paddr + sizeof(*trigger_tab),
357 (unsigned long long)trigger_paddr + table_size - 1);
358 goto out_rel_header;
359 }
360 iounmap(trigger_tab);
361 trigger_tab = ioremap_cache(trigger_paddr, table_size);
362 if (!trigger_tab) {
363 pr_err(EINJ_PFX "Failed to map trigger table!\n");
364 goto out_rel_entry;
365 }
366 trigger_entry = (struct acpi_whea_header *)
367 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
368 apei_resources_init(&trigger_resources);
369 apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
370 ARRAY_SIZE(einj_ins_type),
371 trigger_entry, trigger_tab->entry_count);
372 rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
373 if (rc)
374 goto out_fini;
375 rc = apei_resources_sub(&trigger_resources, &einj_resources);
376 if (rc)
377 goto out_fini;
378 /*
379 * Some firmware will access target address specified in
380 * param1 to trigger the error when injecting memory error.
381 * This will cause resource conflict with regular memory. So
382 * remove it from trigger table resources.
383 */
384 if (param_extension && (type & 0x0038) && param2) {
385 struct apei_resources addr_resources;
386 apei_resources_init(&addr_resources);
387 trigger_param_region = einj_get_trigger_parameter_region(
388 trigger_tab, param1, param2);
389 if (trigger_param_region) {
390 rc = apei_resources_add(&addr_resources,
391 trigger_param_region->address,
392 trigger_param_region->bit_width/8, true);
393 if (rc)
394 goto out_fini;
395 rc = apei_resources_sub(&trigger_resources,
396 &addr_resources);
397 }
398 apei_resources_fini(&addr_resources);
399 if (rc)
400 goto out_fini;
401 }
402 rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
403 if (rc)
404 goto out_fini;
405 rc = apei_exec_pre_map_gars(&trigger_ctx);
406 if (rc)
407 goto out_release;
408
409 rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);
410
411 apei_exec_post_unmap_gars(&trigger_ctx);
412 out_release:
413 apei_resources_release(&trigger_resources);
414 out_fini:
415 apei_resources_fini(&trigger_resources);
416 out_rel_entry:
417 release_mem_region(trigger_paddr + sizeof(*trigger_tab),
418 table_size - sizeof(*trigger_tab));
419 out_rel_header:
420 release_mem_region(trigger_paddr, sizeof(*trigger_tab));
421 out:
422 if (trigger_tab)
423 iounmap(trigger_tab);
424
425 return rc;
426 }
427
428 static int __einj_error_inject(u32 type, u64 param1, u64 param2)
429 {
430 struct apei_exec_context ctx;
431 u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
432 int rc;
433
434 einj_exec_ctx_init(&ctx);
435
436 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION);
437 if (rc)
438 return rc;
439 apei_exec_ctx_set_input(&ctx, type);
440 if (acpi5) {
441 struct set_error_type_with_address *v5param = einj_param;
442
443 writel(type, &v5param->type);
444 if (type & 0x80000000) {
445 switch (vendor_flags) {
446 case SETWA_FLAGS_APICID:
447 writel(param1, &v5param->apicid);
448 break;
449 case SETWA_FLAGS_MEM:
450 writeq(param1, &v5param->memory_address);
451 writeq(param2, &v5param->memory_address_range);
452 break;
453 case SETWA_FLAGS_PCIE_SBDF:
454 writel(param1, &v5param->pcie_sbdf);
455 break;
456 }
457 writel(vendor_flags, &v5param->flags);
458 } else {
459 switch (type) {
460 case ACPI_EINJ_PROCESSOR_CORRECTABLE:
461 case ACPI_EINJ_PROCESSOR_UNCORRECTABLE:
462 case ACPI_EINJ_PROCESSOR_FATAL:
463 writel(param1, &v5param->apicid);
464 writel(SETWA_FLAGS_APICID, &v5param->flags);
465 break;
466 case ACPI_EINJ_MEMORY_CORRECTABLE:
467 case ACPI_EINJ_MEMORY_UNCORRECTABLE:
468 case ACPI_EINJ_MEMORY_FATAL:
469 writeq(param1, &v5param->memory_address);
470 writeq(param2, &v5param->memory_address_range);
471 writel(SETWA_FLAGS_MEM, &v5param->flags);
472 break;
473 case ACPI_EINJ_PCIX_CORRECTABLE:
474 case ACPI_EINJ_PCIX_UNCORRECTABLE:
475 case ACPI_EINJ_PCIX_FATAL:
476 writel(param1, &v5param->pcie_sbdf);
477 writel(SETWA_FLAGS_PCIE_SBDF, &v5param->flags);
478 break;
479 }
480 }
481 } else {
482 rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
483 if (rc)
484 return rc;
485 if (einj_param) {
486 struct einj_parameter *v4param = einj_param;
487 writeq(param1, &v4param->param1);
488 writeq(param2, &v4param->param2);
489 }
490 }
491 rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
492 if (rc)
493 return rc;
494 for (;;) {
495 rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
496 if (rc)
497 return rc;
498 val = apei_exec_ctx_get_output(&ctx);
499 if (!(val & EINJ_OP_BUSY))
500 break;
501 if (einj_timedout(&timeout))
502 return -EIO;
503 }
504 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
505 if (rc)
506 return rc;
507 val = apei_exec_ctx_get_output(&ctx);
508 if (val != EINJ_STATUS_SUCCESS)
509 return -EBUSY;
510
511 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
512 if (rc)
513 return rc;
514 trigger_paddr = apei_exec_ctx_get_output(&ctx);
515 rc = __einj_error_trigger(trigger_paddr, type, param1, param2);
516 if (rc)
517 return rc;
518 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION);
519
520 return rc;
521 }
522
523 /* Inject the specified hardware error */
524 static int einj_error_inject(u32 type, u64 param1, u64 param2)
525 {
526 int rc;
527
528 mutex_lock(&einj_mutex);
529 rc = __einj_error_inject(type, param1, param2);
530 mutex_unlock(&einj_mutex);
531
532 return rc;
533 }
534
535 static u32 error_type;
536 static u64 error_param1;
537 static u64 error_param2;
538 static struct dentry *einj_debug_dir;
539
540 static int available_error_type_show(struct seq_file *m, void *v)
541 {
542 int rc;
543 u32 available_error_type = 0;
544
545 rc = einj_get_available_error_type(&available_error_type);
546 if (rc)
547 return rc;
548 if (available_error_type & 0x0001)
549 seq_printf(m, "0x00000001\tProcessor Correctable\n");
550 if (available_error_type & 0x0002)
551 seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n");
552 if (available_error_type & 0x0004)
553 seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n");
554 if (available_error_type & 0x0008)
555 seq_printf(m, "0x00000008\tMemory Correctable\n");
556 if (available_error_type & 0x0010)
557 seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n");
558 if (available_error_type & 0x0020)
559 seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n");
560 if (available_error_type & 0x0040)
561 seq_printf(m, "0x00000040\tPCI Express Correctable\n");
562 if (available_error_type & 0x0080)
563 seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n");
564 if (available_error_type & 0x0100)
565 seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n");
566 if (available_error_type & 0x0200)
567 seq_printf(m, "0x00000200\tPlatform Correctable\n");
568 if (available_error_type & 0x0400)
569 seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n");
570 if (available_error_type & 0x0800)
571 seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n");
572
573 return 0;
574 }
575
576 static int available_error_type_open(struct inode *inode, struct file *file)
577 {
578 return single_open(file, available_error_type_show, NULL);
579 }
580
581 static const struct file_operations available_error_type_fops = {
582 .open = available_error_type_open,
583 .read = seq_read,
584 .llseek = seq_lseek,
585 .release = single_release,
586 };
587
588 static int error_type_get(void *data, u64 *val)
589 {
590 *val = error_type;
591
592 return 0;
593 }
594
595 static int error_type_set(void *data, u64 val)
596 {
597 int rc;
598 u32 available_error_type = 0;
599 u32 tval, vendor;
600
601 /*
602 * Vendor defined types have 0x80000000 bit set, and
603 * are not enumerated by ACPI_EINJ_GET_ERROR_TYPE
604 */
605 vendor = val & 0x80000000;
606 tval = val & 0x7fffffff;
607
608 /* Only one error type can be specified */
609 if (tval & (tval - 1))
610 return -EINVAL;
611 if (!vendor) {
612 rc = einj_get_available_error_type(&available_error_type);
613 if (rc)
614 return rc;
615 if (!(val & available_error_type))
616 return -EINVAL;
617 }
618 error_type = val;
619
620 return 0;
621 }
622
623 DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get,
624 error_type_set, "0x%llx\n");
625
626 static int error_inject_set(void *data, u64 val)
627 {
628 if (!error_type)
629 return -EINVAL;
630
631 return einj_error_inject(error_type, error_param1, error_param2);
632 }
633
634 DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL,
635 error_inject_set, "%llu\n");
636
637 static int einj_check_table(struct acpi_table_einj *einj_tab)
638 {
639 if ((einj_tab->header_length !=
640 (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header)))
641 && (einj_tab->header_length != sizeof(struct acpi_table_einj)))
642 return -EINVAL;
643 if (einj_tab->header.length < sizeof(struct acpi_table_einj))
644 return -EINVAL;
645 if (einj_tab->entries !=
646 (einj_tab->header.length - sizeof(struct acpi_table_einj)) /
647 sizeof(struct acpi_einj_entry))
648 return -EINVAL;
649
650 return 0;
651 }
652
653 static int __init einj_init(void)
654 {
655 int rc;
656 acpi_status status;
657 struct dentry *fentry;
658 struct apei_exec_context ctx;
659
660 if (acpi_disabled)
661 return -ENODEV;
662
663 status = acpi_get_table(ACPI_SIG_EINJ, 0,
664 (struct acpi_table_header **)&einj_tab);
665 if (status == AE_NOT_FOUND)
666 return -ENODEV;
667 else if (ACPI_FAILURE(status)) {
668 const char *msg = acpi_format_exception(status);
669 pr_err(EINJ_PFX "Failed to get table, %s\n", msg);
670 return -EINVAL;
671 }
672
673 rc = einj_check_table(einj_tab);
674 if (rc) {
675 pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n");
676 return -EINVAL;
677 }
678
679 rc = -ENOMEM;
680 einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
681 if (!einj_debug_dir)
682 goto err_cleanup;
683 fentry = debugfs_create_file("available_error_type", S_IRUSR,
684 einj_debug_dir, NULL,
685 &available_error_type_fops);
686 if (!fentry)
687 goto err_cleanup;
688 fentry = debugfs_create_file("error_type", S_IRUSR | S_IWUSR,
689 einj_debug_dir, NULL, &error_type_fops);
690 if (!fentry)
691 goto err_cleanup;
692 fentry = debugfs_create_file("error_inject", S_IWUSR,
693 einj_debug_dir, NULL, &error_inject_fops);
694 if (!fentry)
695 goto err_cleanup;
696
697 apei_resources_init(&einj_resources);
698 einj_exec_ctx_init(&ctx);
699 rc = apei_exec_collect_resources(&ctx, &einj_resources);
700 if (rc)
701 goto err_fini;
702 rc = apei_resources_request(&einj_resources, "APEI EINJ");
703 if (rc)
704 goto err_fini;
705 rc = apei_exec_pre_map_gars(&ctx);
706 if (rc)
707 goto err_release;
708
709 einj_param = einj_get_parameter_address();
710 if ((param_extension || acpi5) && einj_param) {
711 fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,
712 einj_debug_dir, &error_param1);
713 if (!fentry)
714 goto err_unmap;
715 fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR,
716 einj_debug_dir, &error_param2);
717 if (!fentry)
718 goto err_unmap;
719 }
720
721 if (vendor_dev[0]) {
722 vendor_blob.data = vendor_dev;
723 vendor_blob.size = strlen(vendor_dev);
724 fentry = debugfs_create_blob("vendor", S_IRUSR,
725 einj_debug_dir, &vendor_blob);
726 if (!fentry)
727 goto err_unmap;
728 fentry = debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
729 einj_debug_dir, &vendor_flags);
730 if (!fentry)
731 goto err_unmap;
732 }
733
734 pr_info(EINJ_PFX "Error INJection is initialized.\n");
735
736 return 0;
737
738 err_unmap:
739 if (einj_param)
740 iounmap(einj_param);
741 apei_exec_post_unmap_gars(&ctx);
742 err_release:
743 apei_resources_release(&einj_resources);
744 err_fini:
745 apei_resources_fini(&einj_resources);
746 err_cleanup:
747 debugfs_remove_recursive(einj_debug_dir);
748
749 return rc;
750 }
751
752 static void __exit einj_exit(void)
753 {
754 struct apei_exec_context ctx;
755
756 if (einj_param)
757 iounmap(einj_param);
758 einj_exec_ctx_init(&ctx);
759 apei_exec_post_unmap_gars(&ctx);
760 apei_resources_release(&einj_resources);
761 apei_resources_fini(&einj_resources);
762 debugfs_remove_recursive(einj_debug_dir);
763 }
764
765 module_init(einj_init);
766 module_exit(einj_exit);
767
768 MODULE_AUTHOR("Huang Ying");
769 MODULE_DESCRIPTION("APEI Error INJection support");
770 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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