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: 2.1.0"
19 
20 #ifdef CONFIG_EDAC_DEBUG
21 /* Values of 0 to 4 will generate output */
22 int edac_debug_level = 2;
23 EXPORT_SYMBOL_GPL(edac_debug_level);
24 #endif
25 
26 /* scope is to module level only */
27 struct workqueue_struct *edac_workqueue;
28 
29 /*
30  * edac_op_state_to_string()
31  */
edac_op_state_to_string(int opstate)32 char *edac_op_state_to_string(int opstate)
33 {
34 	if (opstate == OP_RUNNING_POLL)
35 		return "POLLED";
36 	else if (opstate == OP_RUNNING_INTERRUPT)
37 		return "INTERRUPT";
38 	else if (opstate == OP_RUNNING_POLL_INTR)
39 		return "POLL-INTR";
40 	else if (opstate == OP_ALLOC)
41 		return "ALLOC";
42 	else if (opstate == OP_OFFLINE)
43 		return "OFFLINE";
44 
45 	return "UNKNOWN";
46 }
47 
48 /*
49  * edac_workqueue_setup
50  *	initialize the edac work queue for polling operations
51  */
edac_workqueue_setup(void)52 static int edac_workqueue_setup(void)
53 {
54 	edac_workqueue = create_singlethread_workqueue("edac-poller");
55 	if (edac_workqueue == NULL)
56 		return -ENODEV;
57 	else
58 		return 0;
59 }
60 
61 /*
62  * edac_workqueue_teardown
63  *	teardown the edac workqueue
64  */
edac_workqueue_teardown(void)65 static void edac_workqueue_teardown(void)
66 {
67 	if (edac_workqueue) {
68 		flush_workqueue(edac_workqueue);
69 		destroy_workqueue(edac_workqueue);
70 		edac_workqueue = NULL;
71 	}
72 }
73 
74 /*
75  * edac_init
76  *      module initialization entry point
77  */
edac_init(void)78 static int __init edac_init(void)
79 {
80 	int err = 0;
81 
82 	edac_printk(KERN_INFO, EDAC_MC, EDAC_VERSION "\n");
83 
84 	/*
85 	 * Harvest and clear any boot/initialization PCI parity errors
86 	 *
87 	 * FIXME: This only clears errors logged by devices present at time of
88 	 *      module initialization.  We should also do an initial clear
89 	 *      of each newly hotplugged device.
90 	 */
91 	edac_pci_clear_parity_errors();
92 
93 	/*
94 	 * now set up the mc_kset under the edac class object
95 	 */
96 	err = edac_sysfs_setup_mc_kset();
97 	if (err)
98 		goto error;
99 
100 	/* Setup/Initialize the workq for this core */
101 	err = edac_workqueue_setup();
102 	if (err) {
103 		edac_printk(KERN_ERR, EDAC_MC, "init WorkQueue failure\n");
104 		goto workq_fail;
105 	}
106 
107 	return 0;
108 
109 	/* Error teardown stack */
110 workq_fail:
111 	edac_sysfs_teardown_mc_kset();
112 
113 error:
114 	return err;
115 }
116 
117 /*
118  * edac_exit()
119  *      module exit/termination function
120  */
edac_exit(void)121 static void __exit edac_exit(void)
122 {
123 	debugf0("%s()\n", __func__);
124 
125 	/* tear down the various subsystems */
126 	edac_workqueue_teardown();
127 	edac_sysfs_teardown_mc_kset();
128 }
129 
130 /*
131  * Inform the kernel of our entry and exit points
132  */
133 module_init(edac_init);
134 module_exit(edac_exit);
135 
136 MODULE_LICENSE("GPL");
137 MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
138 MODULE_DESCRIPTION("Core library routines for EDAC reporting");
139 
140 /* refer to *_sysfs.c files for parameters that are exported via sysfs */
141 
142 #ifdef CONFIG_EDAC_DEBUG
143 module_param(edac_debug_level, int, 0644);
144 MODULE_PARM_DESC(edac_debug_level, "Debug level");
145 #endif
146