1/*
2 * common EDAC components that must be in kernel
3 *
4 * Author: Dave Jiang <djiang@mvista.com>
5 *
6 * 2007 (c) MontaVista Software, Inc.
7 * 2010 (c) Advanced Micro Devices Inc.
8 *	    Borislav Petkov <bp@alien8.de>
9 *
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2. This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
13 *
14 */
15#include <linux/module.h>
16#include <linux/edac.h>
17#include <linux/atomic.h>
18#include <linux/device.h>
19#include <asm/edac.h>
20
21int edac_op_state = EDAC_OPSTATE_INVAL;
22EXPORT_SYMBOL_GPL(edac_op_state);
23
24atomic_t edac_handlers = ATOMIC_INIT(0);
25EXPORT_SYMBOL_GPL(edac_handlers);
26
27int edac_err_assert = 0;
28EXPORT_SYMBOL_GPL(edac_err_assert);
29
30static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
31
32int edac_report_status = EDAC_REPORTING_ENABLED;
33EXPORT_SYMBOL_GPL(edac_report_status);
34
35static int __init edac_report_setup(char *str)
36{
37	if (!str)
38		return -EINVAL;
39
40	if (!strncmp(str, "on", 2))
41		set_edac_report_status(EDAC_REPORTING_ENABLED);
42	else if (!strncmp(str, "off", 3))
43		set_edac_report_status(EDAC_REPORTING_DISABLED);
44	else if (!strncmp(str, "force", 5))
45		set_edac_report_status(EDAC_REPORTING_FORCE);
46
47	return 0;
48}
49__setup("edac_report=", edac_report_setup);
50
51/*
52 * called to determine if there is an EDAC driver interested in
53 * knowing an event (such as NMI) occurred
54 */
55int edac_handler_set(void)
56{
57	if (edac_op_state == EDAC_OPSTATE_POLL)
58		return 0;
59
60	return atomic_read(&edac_handlers);
61}
62EXPORT_SYMBOL_GPL(edac_handler_set);
63
64/*
65 * handler for NMI type of interrupts to assert error
66 */
67void edac_atomic_assert_error(void)
68{
69	edac_err_assert++;
70}
71EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
72
73/*
74 * sysfs object: /sys/devices/system/edac
75 *	need to export to other files
76 */
77struct bus_type edac_subsys = {
78	.name = "edac",
79	.dev_name = "edac",
80};
81EXPORT_SYMBOL_GPL(edac_subsys);
82
83/* return pointer to the 'edac' node in sysfs */
84struct bus_type *edac_get_sysfs_subsys(void)
85{
86	int err = 0;
87
88	if (atomic_read(&edac_subsys_valid))
89		goto out;
90
91	/* create the /sys/devices/system/edac directory */
92	err = subsys_system_register(&edac_subsys, NULL);
93	if (err) {
94		printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
95		return NULL;
96	}
97
98out:
99	atomic_inc(&edac_subsys_valid);
100	return &edac_subsys;
101}
102EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
103
104void edac_put_sysfs_subsys(void)
105{
106	/* last user unregisters it */
107	if (atomic_dec_and_test(&edac_subsys_valid))
108		bus_unregister(&edac_subsys);
109}
110EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);
111