4 * (C) 2007 www.douglaskthompson.com
5 * This file is licensed under the terms of the GNU General Public
6 * License version 2. This program is licensed "as is" without any
7 * warranty of any kind, whether express or implied.
9 * Author: Doug Thompson <norsk5@xmission.com>
12 #include <linux/edac.h>
14 #include "edac_core.h"
15 #include "edac_module.h"
17 #define EDAC_MC_VERSION "Ver: 2.0.4 " __DATE__
19 #ifdef CONFIG_EDAC_DEBUG
20 /* Values of 0 to 4 will generate output */
21 int edac_debug_level = 1;
22 EXPORT_SYMBOL_GPL(edac_debug_level);
25 /* scope is to module level only */
26 struct workqueue_struct *edac_workqueue;
29 * sysfs object: /sys/devices/system/edac
30 * need to export to other files in this modules
32 static struct sysdev_class edac_class = {
33 set_kset_name("edac"),
35 static int edac_class_valid;
38 * edac_op_state_toString()
40 char *edac_op_state_toString(int opstate)
42 if (opstate == OP_RUNNING_POLL)
44 else if (opstate == OP_RUNNING_INTERRUPT)
46 else if (opstate == OP_RUNNING_POLL_INTR)
48 else if (opstate == OP_ALLOC)
50 else if (opstate == OP_OFFLINE)
57 * edac_get_edac_class()
59 * return pointer to the edac class of 'edac'
61 struct sysdev_class *edac_get_edac_class(void)
63 struct sysdev_class *classptr = NULL;
66 classptr = &edac_class;
72 * edac_register_sysfs_edac_name()
74 * register the 'edac' into /sys/devices/system
80 static int edac_register_sysfs_edac_name(void)
84 /* create the /sys/devices/system/edac directory */
85 err = sysdev_class_register(&edac_class);
88 debugf1("%s() error=%d\n", __func__, err);
97 * sysdev_class_unregister()
99 * unregister the 'edac' from /sys/devices/system
101 static void edac_unregister_sysfs_edac_name(void)
103 /* only if currently registered, then unregister it */
104 if (edac_class_valid)
105 sysdev_class_unregister(&edac_class);
107 edac_class_valid = 0;
111 * edac_workqueue_setup
112 * initialize the edac work queue for polling operations
114 static int edac_workqueue_setup(void)
116 edac_workqueue = create_singlethread_workqueue("edac-poller");
117 if (edac_workqueue == NULL)
124 * edac_workqueue_teardown
125 * teardown the edac workqueue
127 static void edac_workqueue_teardown(void)
129 if (edac_workqueue) {
130 flush_workqueue(edac_workqueue);
131 destroy_workqueue(edac_workqueue);
132 edac_workqueue = NULL;
138 * module initialization entry point
140 static int __init edac_init(void)
144 edac_printk(KERN_INFO, EDAC_MC, EDAC_MC_VERSION "\n");
147 * Harvest and clear any boot/initialization PCI parity errors
149 * FIXME: This only clears errors logged by devices present at time of
150 * module initialization. We should also do an initial clear
151 * of each newly hotplugged device.
153 edac_pci_clear_parity_errors();
156 * perform the registration of the /sys/devices/system/edac object
158 if (edac_register_sysfs_edac_name()) {
159 edac_printk(KERN_ERR, EDAC_MC,
160 "Error initializing 'edac' kobject\n");
165 /* Create the MC sysfs entries, must be first
167 if (edac_sysfs_memctrl_setup()) {
168 edac_printk(KERN_ERR, EDAC_MC,
169 "Error initializing sysfs code\n");
174 /* Setup/Initialize the edac_device system */
175 err = edac_workqueue_setup();
177 edac_printk(KERN_ERR, EDAC_MC, "init WorkQueue failure\n");
183 /* Error teardown stack */
185 edac_sysfs_memctrl_teardown();
187 edac_unregister_sysfs_edac_name();
194 * module exit/termination function
196 static void __exit edac_exit(void)
198 debugf0("%s()\n", __func__);
200 /* tear down the various subsystems */
201 edac_workqueue_teardown();
202 edac_sysfs_memctrl_teardown();
203 edac_unregister_sysfs_edac_name();
207 * Inform the kernel of our entry and exit points
209 module_init(edac_init);
210 module_exit(edac_exit);
212 MODULE_LICENSE("GPL");
213 MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
214 MODULE_DESCRIPTION("Core library routines for EDAC reporting");
216 /* refer to *_sysfs.c files for parameters that are exported via sysfs */
218 #ifdef CONFIG_EDAC_DEBUG
219 module_param(edac_debug_level, int, 0644);
220 MODULE_PARM_DESC(edac_debug_level, "Debug level");