edac_stub.c revision 30e1f7a8122145f44f45c95366e27b6bb0b08428 
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 <borislav.petkov@amd.com>
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 <asm/atomic.h>
18#include <asm/edac.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_class_valid = ATOMIC_INIT(0);
30
31/*
32 * called to determine if there is an EDAC driver interested in
33 * knowing an event (such as NMI) occurred
34 */
35int edac_handler_set(void)
36{
37	if (edac_op_state == EDAC_OPSTATE_POLL)
38		return 0;
39
40	return atomic_read(&edac_handlers);
41}
42EXPORT_SYMBOL_GPL(edac_handler_set);
43
44/*
45 * handler for NMI type of interrupts to assert error
46 */
47void edac_atomic_assert_error(void)
48{
49	edac_err_assert++;
50}
51EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
52
53/*
54 * sysfs object: /sys/devices/system/edac
55 *	need to export to other files
56 */
57struct sysdev_class edac_class = {
58	.name = "edac",
59};
60EXPORT_SYMBOL_GPL(edac_class);
61
62/* return pointer to the 'edac' node in sysfs */
63struct sysdev_class *edac_get_sysfs_class(void)
64{
65	int err = 0;
66
67	if (atomic_read(&edac_class_valid))
68		goto out;
69
70	/* create the /sys/devices/system/edac directory */
71	err = sysdev_class_register(&edac_class);
72	if (err) {
73		printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
74		return NULL;
75	}
76
77out:
78	atomic_inc(&edac_class_valid);
79	return &edac_class;
80}
81EXPORT_SYMBOL_GPL(edac_get_sysfs_class);
82
83void edac_put_sysfs_class(void)
84{
85	/* last user unregisters it */
86	if (atomic_dec_and_test(&edac_class_valid))
87		sysdev_class_unregister(&edac_class);
88}
89EXPORT_SYMBOL_GPL(edac_put_sysfs_class);
90