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
20 int edac_op_state = EDAC_OPSTATE_INVAL;
21 EXPORT_SYMBOL_GPL(edac_op_state);
22
23 atomic_t edac_handlers = ATOMIC_INIT(0);
24 EXPORT_SYMBOL_GPL(edac_handlers);
25
26 int edac_err_assert = 0;
27 EXPORT_SYMBOL_GPL(edac_err_assert);
28
29 static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
30
31 int edac_report_status = EDAC_REPORTING_ENABLED;
32 EXPORT_SYMBOL_GPL(edac_report_status);
33
edac_report_setup(char * str)34 static 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 */
edac_handler_set(void)54 int edac_handler_set(void)
55 {
56 if (edac_op_state == EDAC_OPSTATE_POLL)
57 return 0;
58
59 return atomic_read(&edac_handlers);
60 }
61 EXPORT_SYMBOL_GPL(edac_handler_set);
62
63 /*
64 * handler for NMI type of interrupts to assert error
65 */
edac_atomic_assert_error(void)66 void edac_atomic_assert_error(void)
67 {
68 edac_err_assert++;
69 }
70 EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
71
72 /*
73 * sysfs object: /sys/devices/system/edac
74 * need to export to other files
75 */
76 struct bus_type edac_subsys = {
77 .name = "edac",
78 .dev_name = "edac",
79 };
80 EXPORT_SYMBOL_GPL(edac_subsys);
81
82 /* return pointer to the 'edac' node in sysfs */
edac_get_sysfs_subsys(void)83 struct 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
97 out:
98 atomic_inc(&edac_subsys_valid);
99 return &edac_subsys;
100 }
101 EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
102
edac_put_sysfs_subsys(void)103 void 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 }
109 EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);
110