/drivers/acpi/apei/einj.c

  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 */
 42static int acpi5;
 43
 44struct 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};
 53enum {
 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 */
 62struct 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
 71static u32 notrigger;
 72
 73static u32 vendor_flags;
 74static struct debugfs_blob_wrapper vendor_blob;
 75static 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 79 * EINJ table through an unpublished extension.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 */
 84struct 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
101static bool param_extension;
102module_param(param_extension, bool, 0);
103
104static struct acpi_table_einj *einj_tab;
105
106static struct apei_resources einj_resources;
107
108static 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 */
136static DEFINE_MUTEX(einj_mutex);
137
138static void *einj_param;
139
140static 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
146static 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 */
161static 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
172static 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
184static 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
204static 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 */
251static 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
266static 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 */
287static 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);
386out_release:
387	apei_resources_release(&trigger_resources);
388out_fini:
389	apei_resources_fini(&trigger_resources);
390out_rel_entry:
391	release_mem_region(trigger_paddr + sizeof(*trigger_tab),
392			   table_size - sizeof(*trigger_tab));
393out_rel_header:
394	release_mem_region(trigger_paddr, sizeof(*trigger_tab));
395out:
396	if (trigger_tab)
397		iounmap(trigger_tab);
398
399	return rc;
400}
401
402static 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 */
507static 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
550inject:
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
558static u32 error_type;
559static u32 error_flags;
560static u64 error_param1;
561static u64 error_param2;
562static u64 error_param3;
563static u64 error_param4;
564static struct dentry *einj_debug_dir;
565
566static 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
602DEFINE_SHOW_ATTRIBUTE(available_error_type);
603
604static int error_type_get(void *data, u64 *val)
605{
606	*val = error_type;
607
608	return 0;
609}
610
611static 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
639DEFINE_DEBUGFS_ATTRIBUTE(error_type_fops, error_type_get, error_type_set,
640			 "0x%llx\n");
641
642static 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
651DEFINE_DEBUGFS_ATTRIBUTE(error_inject_fops, NULL, error_inject_set, "%llu\n");
652
653static 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
669static 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		return -EINVAL;
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	rc = -ENOMEM;
729	einj_param = einj_get_parameter_address();
730	if ((param_extension || acpi5) && einj_param) {
731		debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir,
732				   &error_flags);
733		debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir,
734				   &error_param1);
735		debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir,
736				   &error_param2);
737		debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir,
738				   &error_param3);
739		debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir,
740				   &error_param4);
741		debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
742				   einj_debug_dir, &notrigger);
743	}
744
745	if (vendor_dev[0]) {
746		vendor_blob.data = vendor_dev;
747		vendor_blob.size = strlen(vendor_dev);
748		debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir,
749				    &vendor_blob);
750		debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
751				   einj_debug_dir, &vendor_flags);
752	}
753
754	pr_info("Error INJection is initialized.\n");
755
756	return 0;
757
758err_release:
759	apei_resources_release(&einj_resources);
760err_fini:
761	apei_resources_fini(&einj_resources);
762	debugfs_remove_recursive(einj_debug_dir);
763
764	return rc;
765}
766
767static void __exit einj_exit(void)
768{
769	struct apei_exec_context ctx;
770
771	if (einj_param) {
772		acpi_size size = (acpi5) ?
773			sizeof(struct set_error_type_with_address) :
774			sizeof(struct einj_parameter);
775
776		acpi_os_unmap_iomem(einj_param, size);
777	}
778	einj_exec_ctx_init(&ctx);
779	apei_exec_post_unmap_gars(&ctx);
780	apei_resources_release(&einj_resources);
781	apei_resources_fini(&einj_resources);
782	debugfs_remove_recursive(einj_debug_dir);
783}
784
785module_init(einj_init);
786module_exit(einj_exit);
787
788MODULE_AUTHOR("Huang Ying");
789MODULE_DESCRIPTION("APEI Error INJection support");
790MODULE_LICENSE("GPL");