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 <dougthompson@xmission.com>
11 *
12 */
13#include <linux/edac.h>
14
15#include "edac_core.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, struct kernel_param *kp)
23{
24	unsigned long val;
25	int ret;
26
27	ret = kstrtoul(buf, 0, &val);
28	if (ret)
29		return ret;
30
31	if (val > 4)
32		return -EINVAL;
33
34	return param_set_int(buf, kp);
35}
36
37/* Values of 0 to 4 will generate output */
38int edac_debug_level = 2;
39EXPORT_SYMBOL_GPL(edac_debug_level);
40
41module_param_call(edac_debug_level, edac_set_debug_level, param_get_int,
42		  &edac_debug_level, 0644);
43MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2");
44#endif
45
46/* scope is to module level only */
47struct workqueue_struct *edac_workqueue;
48
49/*
50 * edac_op_state_to_string()
51 */
52char *edac_op_state_to_string(int opstate)
53{
54	if (opstate == OP_RUNNING_POLL)
55		return "POLLED";
56	else if (opstate == OP_RUNNING_INTERRUPT)
57		return "INTERRUPT";
58	else if (opstate == OP_RUNNING_POLL_INTR)
59		return "POLL-INTR";
60	else if (opstate == OP_ALLOC)
61		return "ALLOC";
62	else if (opstate == OP_OFFLINE)
63		return "OFFLINE";
64
65	return "UNKNOWN";
66}
67
68/*
69 * edac_workqueue_setup
70 *	initialize the edac work queue for polling operations
71 */
72static int edac_workqueue_setup(void)
73{
74	edac_workqueue = create_singlethread_workqueue("edac-poller");
75	if (edac_workqueue == NULL)
76		return -ENODEV;
77	else
78		return 0;
79}
80
81/*
82 * edac_workqueue_teardown
83 *	teardown the edac workqueue
84 */
85static void edac_workqueue_teardown(void)
86{
87	if (edac_workqueue) {
88		flush_workqueue(edac_workqueue);
89		destroy_workqueue(edac_workqueue);
90		edac_workqueue = NULL;
91	}
92}
93
94/*
95 * edac_init
96 *      module initialization entry point
97 */
98static int __init edac_init(void)
99{
100	int err = 0;
101
102	edac_printk(KERN_INFO, EDAC_MC, EDAC_VERSION "\n");
103
104	/*
105	 * Harvest and clear any boot/initialization PCI parity errors
106	 *
107	 * FIXME: This only clears errors logged by devices present at time of
108	 *      module initialization.  We should also do an initial clear
109	 *      of each newly hotplugged device.
110	 */
111	edac_pci_clear_parity_errors();
112
113	err = edac_mc_sysfs_init();
114	if (err)
115		goto err_sysfs;
116
117	edac_debugfs_init();
118
119	err = edac_workqueue_setup();
120	if (err) {
121		edac_printk(KERN_ERR, EDAC_MC, "Failure initializing workqueue\n");
122		goto err_wq;
123	}
124
125	return 0;
126
127err_wq:
128	edac_debugfs_exit();
129	edac_mc_sysfs_exit();
130
131err_sysfs:
132	return err;
133}
134
135/*
136 * edac_exit()
137 *      module exit/termination function
138 */
139static void __exit edac_exit(void)
140{
141	edac_dbg(0, "\n");
142
143	/* tear down the various subsystems */
144	edac_workqueue_teardown();
145	edac_mc_sysfs_exit();
146	edac_debugfs_exit();
147}
148
149/*
150 * Inform the kernel of our entry and exit points
151 */
152subsys_initcall(edac_init);
153module_exit(edac_exit);
154
155MODULE_LICENSE("GPL");
156MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
157MODULE_DESCRIPTION("Core library routines for EDAC reporting");
158