summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/apei/bert.c
blob: 5427e49e646b2686b269155156d85f43819fb8e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
// SPDX-License-Identifier: GPL-2.0-only
/*
 * APEI Boot Error Record Table (BERT) support
 *
 * Copyright 2011 Intel Corp.
 *   Author: Huang Ying <ying.huang@intel.com>
 *
 * Under normal circumstances, when a hardware error occurs, the error
 * handler receives control and processes the error. This gives OSPM a
 * chance to process the error condition, report it, and optionally attempt
 * recovery. In some cases, the system is unable to process an error.
 * For example, system firmware or a management controller may choose to
 * reset the system or the system might experience an uncontrolled crash
 * or reset.The boot error source is used to report unhandled errors that
 * occurred in a previous boot. This mechanism is described in the BERT
 * table.
 *
 * For more information about BERT, please refer to ACPI Specification
 * version 4.0, section 17.3.1
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/cper.h>
#include <linux/io.h>

#include "apei-internal.h"

#undef pr_fmt
#define pr_fmt(fmt) "BERT: " fmt

#define ACPI_BERT_PRINT_MAX_RECORDS 5
#define ACPI_BERT_PRINT_MAX_LEN 1024

static int bert_disable __initdata;

/*
 * Print "all" the error records in the BERT table, but avoid huge spam to
 * the console if the BIOS included oversize records, or too many records.
 * Skipping some records here does not lose anything because the full
 * data is available to user tools in:
 *	/sys/firmware/acpi/tables/data/BERT
 */
static void __init bert_print_all(struct acpi_bert_region *region,
				  unsigned int region_len)
{
	struct acpi_hest_generic_status *estatus =
		(struct acpi_hest_generic_status *)region;
	int remain = region_len;
	int printed = 0, skipped = 0;
	u32 estatus_len;

	while (remain >= sizeof(struct acpi_bert_region)) {
		estatus_len = cper_estatus_len(estatus);
		if (remain < estatus_len) {
			pr_err(FW_BUG "Truncated status block (length: %u).\n",
			       estatus_len);
			break;
		}

		/* No more error records. */
		if (!estatus->block_status)
			break;

		if (cper_estatus_check(estatus)) {
			pr_err(FW_BUG "Invalid error record.\n");
			break;
		}

		if (estatus_len < ACPI_BERT_PRINT_MAX_LEN &&
		    printed < ACPI_BERT_PRINT_MAX_RECORDS) {
			pr_info_once("Error records from previous boot:\n");
			cper_estatus_print(KERN_INFO HW_ERR, estatus);
			printed++;
		} else {
			skipped++;
		}

		/*
		 * Because the boot error source is "one-time polled" type,
		 * clear Block Status of current Generic Error Status Block,
		 * once it's printed.
		 */
		estatus->block_status = 0;

		estatus = (void *)estatus + estatus_len;
		remain -= estatus_len;
	}

	if (skipped)
		pr_info(HW_ERR "Skipped %d error records\n", skipped);

	if (printed + skipped)
		pr_info("Total records found: %d\n", printed + skipped);
}

static int __init setup_bert_disable(char *str)
{
	bert_disable = 1;

	return 1;
}
__setup("bert_disable", setup_bert_disable);

static int __init bert_check_table(struct acpi_table_bert *bert_tab)
{
	if (bert_tab->header.length < sizeof(struct acpi_table_bert) ||
	    bert_tab->region_length < sizeof(struct acpi_bert_region))
		return -EINVAL;

	return 0;
}

static int __init bert_init(void)
{
	struct apei_resources bert_resources;
	struct acpi_bert_region *boot_error_region;
	struct acpi_table_bert *bert_tab;
	unsigned int region_len;
	acpi_status status;
	int rc = 0;

	if (acpi_disabled)
		return 0;

	if (bert_disable) {
		pr_info("Boot Error Record Table support is disabled.\n");
		return 0;
	}

	status = acpi_get_table(ACPI_SIG_BERT, 0, (struct acpi_table_header **)&bert_tab);
	if (status == AE_NOT_FOUND)
		return 0;

	if (ACPI_FAILURE(status)) {
		pr_err("get table failed, %s.\n", acpi_format_exception(status));
		return -EINVAL;
	}

	rc = bert_check_table(bert_tab);
	if (rc) {
		pr_err(FW_BUG "table invalid.\n");
		goto out_put_bert_tab;
	}

	region_len = bert_tab->region_length;
	apei_resources_init(&bert_resources);
	rc = apei_resources_add(&bert_resources, bert_tab->address,
				region_len, true);
	if (rc)
		goto out_put_bert_tab;
	rc = apei_resources_request(&bert_resources, "APEI BERT");
	if (rc)
		goto out_fini;
	boot_error_region = ioremap_cache(bert_tab->address, region_len);
	if (boot_error_region) {
		bert_print_all(boot_error_region, region_len);
		iounmap(boot_error_region);
	} else {
		rc = -ENOMEM;
	}

	apei_resources_release(&bert_resources);
out_fini:
	apei_resources_fini(&bert_resources);
out_put_bert_tab:
	acpi_put_table((struct acpi_table_header *)bert_tab);

	return rc;
}

late_initcall(bert_init);