2 * APEI Hardware Error Souce Table support
4 * HEST describes error sources in detail; communicates operational
5 * parameters (i.e. severity levels, masking bits, and threshold
6 * values) to Linux as necessary. It also allows the BIOS to report
7 * non-standard error sources to Linux (for example, chipset-specific
10 * For more information about HEST, please refer to ACPI Specification
11 * version 4.0, section 17.3.2.
13 * Copyright 2009 Intel Corp.
14 * Author: Huang Ying <ying.huang@intel.com>
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License version
18 * 2 as published by the Free Software Foundation;
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/acpi.h>
34 #include <linux/kdebug.h>
35 #include <linux/highmem.h>
37 #include <acpi/apei.h>
39 #include "apei-internal.h"
41 #define HEST_PFX "HEST: "
44 EXPORT_SYMBOL_GPL(hest_disable
);
46 /* HEST table parsing */
48 static struct acpi_table_hest
*hest_tab
;
50 static int hest_void_parse(struct acpi_hest_header
*hest_hdr
, void *data
)
55 static int hest_esrc_len_tab
[ACPI_HEST_TYPE_RESERVED
] = {
56 [ACPI_HEST_TYPE_IA32_CHECK
] = -1, /* need further calculation */
57 [ACPI_HEST_TYPE_IA32_CORRECTED_CHECK
] = -1,
58 [ACPI_HEST_TYPE_IA32_NMI
] = sizeof(struct acpi_hest_ia_nmi
),
59 [ACPI_HEST_TYPE_AER_ROOT_PORT
] = sizeof(struct acpi_hest_aer_root
),
60 [ACPI_HEST_TYPE_AER_ENDPOINT
] = sizeof(struct acpi_hest_aer
),
61 [ACPI_HEST_TYPE_AER_BRIDGE
] = sizeof(struct acpi_hest_aer_bridge
),
62 [ACPI_HEST_TYPE_GENERIC_ERROR
] = sizeof(struct acpi_hest_generic
),
65 static int hest_esrc_len(struct acpi_hest_header
*hest_hdr
)
67 u16 hest_type
= hest_hdr
->type
;
70 if (hest_type
>= ACPI_HEST_TYPE_RESERVED
)
73 len
= hest_esrc_len_tab
[hest_type
];
75 if (hest_type
== ACPI_HEST_TYPE_IA32_CORRECTED_CHECK
) {
76 struct acpi_hest_ia_corrected
*cmc
;
77 cmc
= (struct acpi_hest_ia_corrected
*)hest_hdr
;
78 len
= sizeof(*cmc
) + cmc
->num_hardware_banks
*
79 sizeof(struct acpi_hest_ia_error_bank
);
80 } else if (hest_type
== ACPI_HEST_TYPE_IA32_CHECK
) {
81 struct acpi_hest_ia_machine_check
*mc
;
82 mc
= (struct acpi_hest_ia_machine_check
*)hest_hdr
;
83 len
= sizeof(*mc
) + mc
->num_hardware_banks
*
84 sizeof(struct acpi_hest_ia_error_bank
);
91 int apei_hest_parse(apei_hest_func_t func
, void *data
)
93 struct acpi_hest_header
*hest_hdr
;
99 hest_hdr
= (struct acpi_hest_header
*)(hest_tab
+ 1);
100 for (i
= 0; i
< hest_tab
->error_source_count
; i
++) {
101 len
= hest_esrc_len(hest_hdr
);
103 pr_warning(FW_WARN HEST_PFX
104 "Unknown or unused hardware error source "
105 "type: %d for hardware error source: %d.\n",
106 hest_hdr
->type
, hest_hdr
->source_id
);
109 if ((void *)hest_hdr
+ len
>
110 (void *)hest_tab
+ hest_tab
->header
.length
) {
111 pr_warning(FW_BUG HEST_PFX
112 "Table contents overflow for hardware error source: %d.\n",
113 hest_hdr
->source_id
);
117 rc
= func(hest_hdr
, data
);
121 hest_hdr
= (void *)hest_hdr
+ len
;
126 EXPORT_SYMBOL_GPL(apei_hest_parse
);
128 static int __init
setup_hest_disable(char *str
)
134 __setup("hest_disable", setup_hest_disable
);
136 static int __init
hest_init(void)
145 pr_info(HEST_PFX
"HEST tabling parsing is disabled.\n");
149 status
= acpi_get_table(ACPI_SIG_HEST
, 0,
150 (struct acpi_table_header
**)&hest_tab
);
151 if (status
== AE_NOT_FOUND
) {
152 pr_info(HEST_PFX
"Table is not found!\n");
154 } else if (ACPI_FAILURE(status
)) {
155 const char *msg
= acpi_format_exception(status
);
156 pr_err(HEST_PFX
"Failed to get table, %s\n", msg
);
161 rc
= apei_hest_parse(hest_void_parse
, NULL
);
165 pr_info(HEST_PFX
"HEST table parsing is initialized.\n");
173 subsys_initcall(hest_init
);