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1/*
2 * edac_module.c
3 *
4 * (C) 2007 www.softwarebitmaker.com
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 *
10 * Author: Doug Thompson <[email protected]>
11 *
12 */
13#include <linux/edac.h>
14
15#include "edac_mc.h"
16#include "edac_module.h"
17
18#define EDAC_VERSION "Ver: 3.0.0"
19
20#ifdef CONFIG_EDAC_DEBUG
21
22static int edac_set_debug_level(const char *buf,
23 const struct kernel_param *kp)
24{
25 unsigned long val;
26 int ret;
27
28 ret = kstrtoul(buf, 0, &val);
29 if (ret)
30 return ret;
31
32 if (val > 4)
33 return -EINVAL;
34
35 return param_set_int(buf, kp);
36}
37
38/* Values of 0 to 4 will generate output */
39int edac_debug_level = 2;
40EXPORT_SYMBOL_GPL(edac_debug_level);
41
42module_param_call(edac_debug_level, edac_set_debug_level, param_get_int,
43 &edac_debug_level, 0644);
44MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2");
45#endif
46
47/*
48 * edac_op_state_to_string()
49 */
50char *edac_op_state_to_string(int opstate)
51{
52 if (opstate == OP_RUNNING_POLL)
53 return "POLLED";
54 else if (opstate == OP_RUNNING_INTERRUPT)
55 return "INTERRUPT";
56 else if (opstate == OP_RUNNING_POLL_INTR)
57 return "POLL-INTR";
58 else if (opstate == OP_ALLOC)
59 return "ALLOC";
60 else if (opstate == OP_OFFLINE)
61 return "OFFLINE";
62
63 return "UNKNOWN";
64}
65
66/*
67 * sysfs object: /sys/devices/system/edac
68 * need to export to other files
69 */
70static const struct bus_type edac_subsys = {
71 .name = "edac",
72 .dev_name = "edac",
73};
74
75static int edac_subsys_init(void)
76{
77 int err;
78
79 /* create the /sys/devices/system/edac directory */
80 err = subsys_system_register(&edac_subsys, NULL);
81 if (err)
82 printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
83
84 return err;
85}
86
87static void edac_subsys_exit(void)
88{
89 bus_unregister(&edac_subsys);
90}
91
92/* return pointer to the 'edac' node in sysfs */
93const struct bus_type *edac_get_sysfs_subsys(void)
94{
95 return &edac_subsys;
96}
97EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
98/*
99 * edac_init
100 * module initialization entry point
101 */
102static int __init edac_init(void)
103{
104 int err = 0;
105
106 edac_printk(KERN_INFO, EDAC_MC, EDAC_VERSION "\n");
107
108 err = edac_subsys_init();
109 if (err)
110 return err;
111
112 /*
113 * Harvest and clear any boot/initialization PCI parity errors
114 *
115 * FIXME: This only clears errors logged by devices present at time of
116 * module initialization. We should also do an initial clear
117 * of each newly hotplugged device.
118 */
119 edac_pci_clear_parity_errors();
120
121 err = edac_mc_sysfs_init();
122 if (err)
123 goto err_sysfs;
124
125 edac_debugfs_init();
126
127 err = edac_workqueue_setup();
128 if (err) {
129 edac_printk(KERN_ERR, EDAC_MC, "Failure initializing workqueue\n");
130 goto err_wq;
131 }
132
133 return 0;
134
135err_wq:
136 edac_debugfs_exit();
137 edac_mc_sysfs_exit();
138
139err_sysfs:
140 edac_subsys_exit();
141
142 return err;
143}
144
145/*
146 * edac_exit()
147 * module exit/termination function
148 */
149static void __exit edac_exit(void)
150{
151 edac_dbg(0, "\n");
152
153 /* tear down the various subsystems */
154 edac_workqueue_teardown();
155 edac_mc_sysfs_exit();
156 edac_debugfs_exit();
157 edac_subsys_exit();
158}
159
160/*
161 * Inform the kernel of our entry and exit points
162 */
163subsys_initcall(edac_init);
164module_exit(edac_exit);
165
166MODULE_LICENSE("GPL");
167MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
168MODULE_DESCRIPTION("Core library routines for EDAC reporting");