2 * APEI Error INJection support
4 * EINJ provides a hardware error injection mechanism, this is useful
5 * for debugging and testing of other APEI and RAS features.
7 * For more information about EINJ, please refer to ACPI Specification
8 * version 4.0, section 17.5.
10 * Copyright 2009-2010 Intel Corp.
11 * Author: Huang Ying <ying.huang@intel.com>
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.
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.
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
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.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>
37 #include "apei-internal.h"
39 #define EINJ_PFX "EINJ: "
41 #define SPIN_UNIT 100 /* 100ns */
42 /* Firmware should respond within 1 milliseconds */
43 #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC)
46 * Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
47 * EINJ table through an unpublished extension. Use with caution as
48 * most will ignore the parameter and make their own choice of address
49 * for error injection. This extension is used only if
50 * param_extension module parameter is specified.
52 struct einj_parameter {
60 #define EINJ_OP_BUSY 0x1
61 #define EINJ_STATUS_SUCCESS 0x0
62 #define EINJ_STATUS_FAIL 0x1
63 #define EINJ_STATUS_INVAL 0x2
65 #define EINJ_TAB_ENTRY(tab) \
66 ((struct acpi_whea_header *)((char *)(tab) + \
67 sizeof(struct acpi_table_einj)))
69 static bool param_extension;
70 module_param(param_extension, bool, 0);
72 static struct acpi_table_einj *einj_tab;
74 static struct apei_resources einj_resources;
76 static struct apei_exec_ins_type einj_ins_type[] = {
77 [ACPI_EINJ_READ_REGISTER] = {
78 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
79 .run = apei_exec_read_register,
81 [ACPI_EINJ_READ_REGISTER_VALUE] = {
82 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
83 .run = apei_exec_read_register_value,
85 [ACPI_EINJ_WRITE_REGISTER] = {
86 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
87 .run = apei_exec_write_register,
89 [ACPI_EINJ_WRITE_REGISTER_VALUE] = {
90 .flags = APEI_EXEC_INS_ACCESS_REGISTER,
91 .run = apei_exec_write_register_value,
95 .run = apei_exec_noop,
100 * Prevent EINJ interpreter to run simultaneously, because the
101 * corresponding firmware implementation may not work properly when
102 * invoked simultaneously.
104 static DEFINE_MUTEX(einj_mutex);
106 static struct einj_parameter *einj_param;
109 static inline void writeq(__u64 val, volatile void __iomem *addr)
112 writel(val >> 32, addr+4);
116 static void einj_exec_ctx_init(struct apei_exec_context *ctx)
118 apei_exec_ctx_init(ctx, einj_ins_type, ARRAY_SIZE(einj_ins_type),
119 EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
122 static int __einj_get_available_error_type(u32 *type)
124 struct apei_exec_context ctx;
127 einj_exec_ctx_init(&ctx);
128 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
131 *type = apei_exec_ctx_get_output(&ctx);
136 /* Get error injection capabilities of the platform */
137 static int einj_get_available_error_type(u32 *type)
141 mutex_lock(&einj_mutex);
142 rc = __einj_get_available_error_type(type);
143 mutex_unlock(&einj_mutex);
148 static int einj_timedout(u64 *t)
150 if ((s64)*t < SPIN_UNIT) {
151 pr_warning(FW_WARN EINJ_PFX
152 "Firmware does not respond in time\n");
157 touch_nmi_watchdog();
161 static u64 einj_get_parameter_address(void)
165 struct acpi_whea_header *entry;
167 entry = EINJ_TAB_ENTRY(einj_tab);
168 for (i = 0; i < einj_tab->entries; i++) {
169 if (entry->action == ACPI_EINJ_SET_ERROR_TYPE &&
170 entry->instruction == ACPI_EINJ_WRITE_REGISTER &&
171 entry->register_region.space_id ==
172 ACPI_ADR_SPACE_SYSTEM_MEMORY)
173 memcpy(&paddr, &entry->register_region.address,
181 /* do sanity check to trigger table */
182 static int einj_check_trigger_header(struct acpi_einj_trigger *trigger_tab)
184 if (trigger_tab->header_size != sizeof(struct acpi_einj_trigger))
186 if (trigger_tab->table_size > PAGE_SIZE ||
187 trigger_tab->table_size <= trigger_tab->header_size)
189 if (trigger_tab->entry_count !=
190 (trigger_tab->table_size - trigger_tab->header_size) /
191 sizeof(struct acpi_einj_entry))
197 static struct acpi_generic_address *einj_get_trigger_parameter_region(
198 struct acpi_einj_trigger *trigger_tab, u64 param1, u64 param2)
201 struct acpi_whea_header *entry;
203 entry = (struct acpi_whea_header *)
204 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
205 for (i = 0; i < trigger_tab->entry_count; i++) {
206 if (entry->action == ACPI_EINJ_TRIGGER_ERROR &&
207 entry->instruction == ACPI_EINJ_WRITE_REGISTER_VALUE &&
208 entry->register_region.space_id ==
209 ACPI_ADR_SPACE_SYSTEM_MEMORY &&
210 (entry->register_region.address & param2) == (param1 & param2))
211 return &entry->register_region;
217 /* Execute instructions in trigger error action table */
218 static int __einj_error_trigger(u64 trigger_paddr, u32 type,
219 u64 param1, u64 param2)
221 struct acpi_einj_trigger *trigger_tab = NULL;
222 struct apei_exec_context trigger_ctx;
223 struct apei_resources trigger_resources;
224 struct acpi_whea_header *trigger_entry;
228 struct acpi_generic_address *trigger_param_region = NULL;
230 r = request_mem_region(trigger_paddr, sizeof(*trigger_tab),
231 "APEI EINJ Trigger Table");
234 "Can not request [mem %#010llx-%#010llx] for Trigger table\n",
235 (unsigned long long)trigger_paddr,
236 (unsigned long long)trigger_paddr +
237 sizeof(*trigger_tab) - 1);
240 trigger_tab = ioremap_cache(trigger_paddr, sizeof(*trigger_tab));
242 pr_err(EINJ_PFX "Failed to map trigger table!\n");
245 rc = einj_check_trigger_header(trigger_tab);
247 pr_warning(FW_BUG EINJ_PFX
248 "The trigger error action table is invalid\n");
252 table_size = trigger_tab->table_size;
253 r = request_mem_region(trigger_paddr + sizeof(*trigger_tab),
254 table_size - sizeof(*trigger_tab),
255 "APEI EINJ Trigger Table");
258 "Can not request [mem %#010llx-%#010llx] for Trigger Table Entry\n",
259 (unsigned long long)trigger_paddr + sizeof(*trigger_tab),
260 (unsigned long long)trigger_paddr + table_size - 1);
263 iounmap(trigger_tab);
264 trigger_tab = ioremap_cache(trigger_paddr, table_size);
266 pr_err(EINJ_PFX "Failed to map trigger table!\n");
269 trigger_entry = (struct acpi_whea_header *)
270 ((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
271 apei_resources_init(&trigger_resources);
272 apei_exec_ctx_init(&trigger_ctx, einj_ins_type,
273 ARRAY_SIZE(einj_ins_type),
274 trigger_entry, trigger_tab->entry_count);
275 rc = apei_exec_collect_resources(&trigger_ctx, &trigger_resources);
278 rc = apei_resources_sub(&trigger_resources, &einj_resources);
282 * Some firmware will access target address specified in
283 * param1 to trigger the error when injecting memory error.
284 * This will cause resource conflict with regular memory. So
285 * remove it from trigger table resources.
287 if (param_extension && (type & 0x0038) && param2) {
288 struct apei_resources addr_resources;
289 apei_resources_init(&addr_resources);
290 trigger_param_region = einj_get_trigger_parameter_region(
291 trigger_tab, param1, param2);
292 if (trigger_param_region) {
293 rc = apei_resources_add(&addr_resources,
294 trigger_param_region->address,
295 trigger_param_region->bit_width/8, true);
298 rc = apei_resources_sub(&trigger_resources,
301 apei_resources_fini(&addr_resources);
305 rc = apei_resources_request(&trigger_resources, "APEI EINJ Trigger");
308 rc = apei_exec_pre_map_gars(&trigger_ctx);
312 rc = apei_exec_run(&trigger_ctx, ACPI_EINJ_TRIGGER_ERROR);
314 apei_exec_post_unmap_gars(&trigger_ctx);
316 apei_resources_release(&trigger_resources);
318 apei_resources_fini(&trigger_resources);
320 release_mem_region(trigger_paddr + sizeof(*trigger_tab),
321 table_size - sizeof(*trigger_tab));
323 release_mem_region(trigger_paddr, sizeof(*trigger_tab));
326 iounmap(trigger_tab);
331 static int __einj_error_inject(u32 type, u64 param1, u64 param2)
333 struct apei_exec_context ctx;
334 u64 val, trigger_paddr, timeout = FIRMWARE_TIMEOUT;
337 einj_exec_ctx_init(&ctx);
339 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_BEGIN_OPERATION);
342 apei_exec_ctx_set_input(&ctx, type);
343 rc = apei_exec_run(&ctx, ACPI_EINJ_SET_ERROR_TYPE);
347 writeq(param1, &einj_param->param1);
348 writeq(param2, &einj_param->param2);
350 rc = apei_exec_run(&ctx, ACPI_EINJ_EXECUTE_OPERATION);
354 rc = apei_exec_run(&ctx, ACPI_EINJ_CHECK_BUSY_STATUS);
357 val = apei_exec_ctx_get_output(&ctx);
358 if (!(val & EINJ_OP_BUSY))
360 if (einj_timedout(&timeout))
363 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_COMMAND_STATUS);
366 val = apei_exec_ctx_get_output(&ctx);
367 if (val != EINJ_STATUS_SUCCESS)
370 rc = apei_exec_run(&ctx, ACPI_EINJ_GET_TRIGGER_TABLE);
373 trigger_paddr = apei_exec_ctx_get_output(&ctx);
374 rc = __einj_error_trigger(trigger_paddr, type, param1, param2);
377 rc = apei_exec_run_optional(&ctx, ACPI_EINJ_END_OPERATION);
382 /* Inject the specified hardware error */
383 static int einj_error_inject(u32 type, u64 param1, u64 param2)
387 mutex_lock(&einj_mutex);
388 rc = __einj_error_inject(type, param1, param2);
389 mutex_unlock(&einj_mutex);
394 static u32 error_type;
395 static u64 error_param1;
396 static u64 error_param2;
397 static struct dentry *einj_debug_dir;
399 static int available_error_type_show(struct seq_file *m, void *v)
402 u32 available_error_type = 0;
404 rc = einj_get_available_error_type(&available_error_type);
407 if (available_error_type & 0x0001)
408 seq_printf(m, "0x00000001\tProcessor Correctable\n");
409 if (available_error_type & 0x0002)
410 seq_printf(m, "0x00000002\tProcessor Uncorrectable non-fatal\n");
411 if (available_error_type & 0x0004)
412 seq_printf(m, "0x00000004\tProcessor Uncorrectable fatal\n");
413 if (available_error_type & 0x0008)
414 seq_printf(m, "0x00000008\tMemory Correctable\n");
415 if (available_error_type & 0x0010)
416 seq_printf(m, "0x00000010\tMemory Uncorrectable non-fatal\n");
417 if (available_error_type & 0x0020)
418 seq_printf(m, "0x00000020\tMemory Uncorrectable fatal\n");
419 if (available_error_type & 0x0040)
420 seq_printf(m, "0x00000040\tPCI Express Correctable\n");
421 if (available_error_type & 0x0080)
422 seq_printf(m, "0x00000080\tPCI Express Uncorrectable non-fatal\n");
423 if (available_error_type & 0x0100)
424 seq_printf(m, "0x00000100\tPCI Express Uncorrectable fatal\n");
425 if (available_error_type & 0x0200)
426 seq_printf(m, "0x00000200\tPlatform Correctable\n");
427 if (available_error_type & 0x0400)
428 seq_printf(m, "0x00000400\tPlatform Uncorrectable non-fatal\n");
429 if (available_error_type & 0x0800)
430 seq_printf(m, "0x00000800\tPlatform Uncorrectable fatal\n");
435 static int available_error_type_open(struct inode *inode, struct file *file)
437 return single_open(file, available_error_type_show, NULL);
440 static const struct file_operations available_error_type_fops = {
441 .open = available_error_type_open,
444 .release = single_release,
447 static int error_type_get(void *data, u64 *val)
454 static int error_type_set(void *data, u64 val)
457 u32 available_error_type = 0;
459 /* Only one error type can be specified */
462 rc = einj_get_available_error_type(&available_error_type);
465 if (!(val & available_error_type))
472 DEFINE_SIMPLE_ATTRIBUTE(error_type_fops, error_type_get,
473 error_type_set, "0x%llx\n");
475 static int error_inject_set(void *data, u64 val)
480 return einj_error_inject(error_type, error_param1, error_param2);
483 DEFINE_SIMPLE_ATTRIBUTE(error_inject_fops, NULL,
484 error_inject_set, "%llu\n");
486 static int einj_check_table(struct acpi_table_einj *einj_tab)
488 if ((einj_tab->header_length !=
489 (sizeof(struct acpi_table_einj) - sizeof(einj_tab->header)))
490 && (einj_tab->header_length != sizeof(struct acpi_table_einj)))
492 if (einj_tab->header.length < sizeof(struct acpi_table_einj))
494 if (einj_tab->entries !=
495 (einj_tab->header.length - sizeof(struct acpi_table_einj)) /
496 sizeof(struct acpi_einj_entry))
502 static int __init einj_init(void)
507 struct dentry *fentry;
508 struct apei_exec_context ctx;
513 status = acpi_get_table(ACPI_SIG_EINJ, 0,
514 (struct acpi_table_header **)&einj_tab);
515 if (status == AE_NOT_FOUND)
517 else if (ACPI_FAILURE(status)) {
518 const char *msg = acpi_format_exception(status);
519 pr_err(EINJ_PFX "Failed to get table, %s\n", msg);
523 rc = einj_check_table(einj_tab);
525 pr_warning(FW_BUG EINJ_PFX "EINJ table is invalid\n");
530 einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
533 fentry = debugfs_create_file("available_error_type", S_IRUSR,
534 einj_debug_dir, NULL,
535 &available_error_type_fops);
538 fentry = debugfs_create_file("error_type", S_IRUSR | S_IWUSR,
539 einj_debug_dir, NULL, &error_type_fops);
542 fentry = debugfs_create_file("error_inject", S_IWUSR,
543 einj_debug_dir, NULL, &error_inject_fops);
547 apei_resources_init(&einj_resources);
548 einj_exec_ctx_init(&ctx);
549 rc = apei_exec_collect_resources(&ctx, &einj_resources);
552 rc = apei_resources_request(&einj_resources, "APEI EINJ");
555 rc = apei_exec_pre_map_gars(&ctx);
558 if (param_extension) {
559 param_paddr = einj_get_parameter_address();
561 einj_param = ioremap(param_paddr, sizeof(*einj_param));
565 fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,
566 einj_debug_dir, &error_param1);
569 fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR,
570 einj_debug_dir, &error_param2);
574 pr_warn(EINJ_PFX "Parameter extension is not supported.\n");
577 pr_info(EINJ_PFX "Error INJection is initialized.\n");
584 apei_exec_post_unmap_gars(&ctx);
586 apei_resources_release(&einj_resources);
588 apei_resources_fini(&einj_resources);
590 debugfs_remove_recursive(einj_debug_dir);
595 static void __exit einj_exit(void)
597 struct apei_exec_context ctx;
601 einj_exec_ctx_init(&ctx);
602 apei_exec_post_unmap_gars(&ctx);
603 apei_resources_release(&einj_resources);
604 apei_resources_fini(&einj_resources);
605 debugfs_remove_recursive(einj_debug_dir);
608 module_init(einj_init);
609 module_exit(einj_exit);
611 MODULE_AUTHOR("Huang Ying");
612 MODULE_DESCRIPTION("APEI Error INJection support");
613 MODULE_LICENSE("GPL");