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
20int edac_op_state = EDAC_OPSTATE_INVAL;
21EXPORT_SYMBOL_GPL(edac_op_state);
22
23atomic_t edac_handlers = ATOMIC_INIT(0);
24EXPORT_SYMBOL_GPL(edac_handlers);
25
26int edac_err_assert = 0;
27EXPORT_SYMBOL_GPL(edac_err_assert);
28
29static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
30
31int edac_report_status = EDAC_REPORTING_ENABLED;
32EXPORT_SYMBOL_GPL(edac_report_status);
33
34static int __init edac_report_setup(char *str)
35{
36	if (!str)
37		return -EINVAL;
38
39	if (!strncmp(str, "on", 2))
40		set_edac_report_status(EDAC_REPORTING_ENABLED);
41	else if (!strncmp(str, "off", 3))
42		set_edac_report_status(EDAC_REPORTING_DISABLED);
43	else if (!strncmp(str, "force", 5))
44		set_edac_report_status(EDAC_REPORTING_FORCE);
45
46	return 0;
47}
48__setup("edac_report=", edac_report_setup);
49
50/*
51 * called to determine if there is an EDAC driver interested in
52 * knowing an event (such as NMI) occurred
53 */
54int edac_handler_set(void)
55{
56	if (edac_op_state == EDAC_OPSTATE_POLL)
57		return 0;
58
59	return atomic_read(&edac_handlers);
60}
61EXPORT_SYMBOL_GPL(edac_handler_set);
62
63/*
64 * handler for NMI type of interrupts to assert error
65 */
66void edac_atomic_assert_error(void)
67{
68	edac_err_assert++;
69}
70EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
71
72/*
73 * sysfs object: /sys/devices/system/edac
74 *	need to export to other files
75 */
76struct bus_type edac_subsys = {
77	.name = "edac",
78	.dev_name = "edac",
79};
80EXPORT_SYMBOL_GPL(edac_subsys);
81
82/* return pointer to the 'edac' node in sysfs */
83struct bus_type *edac_get_sysfs_subsys(void)
84{
85	int err = 0;
86
87	if (atomic_read(&edac_subsys_valid))
88		goto out;
89
90	/* create the /sys/devices/system/edac directory */
91	err = subsys_system_register(&edac_subsys, NULL);
92	if (err) {
93		printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
94		return NULL;
95	}
96
97out:
98	atomic_inc(&edac_subsys_valid);
99	return &edac_subsys;
100}
101EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
102
103void edac_put_sysfs_subsys(void)
104{
105	/* last user unregisters it */
106	if (atomic_dec_and_test(&edac_subsys_valid))
107		bus_unregister(&edac_subsys);
108}
109EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);
110