aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/edac/edac_module.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/edac/edac_module.c')
-rw-r--r--drivers/edac/edac_module.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/edac/edac_module.c b/drivers/edac/edac_module.c
new file mode 100644
index 000000000000..8db0471a9476
--- /dev/null
+++ b/drivers/edac/edac_module.c
@@ -0,0 +1,130 @@
1
2#include <linux/freezer.h>
3#include <linux/kthread.h>
4
5#include "edac_mc.h"
6#include "edac_module.h"
7
8#define EDAC_MC_VERSION "Ver: 2.0.3" __DATE__
9
10#ifdef CONFIG_EDAC_DEBUG
11/* Values of 0 to 4 will generate output */
12int edac_debug_level = 1;
13EXPORT_SYMBOL_GPL(edac_debug_level);
14#endif
15
16static struct task_struct *edac_thread;
17
18/*
19 * Check MC status every edac_get_poll_msec().
20 * Check PCI status every edac_get_poll_msec() as well.
21 *
22 * This where the work gets done for edac.
23 *
24 * SMP safe, doesn't use NMI, and auto-rate-limits.
25 */
26static void do_edac_check(void)
27{
28 debugf3("%s()\n", __func__);
29
30 /* perform the poll activities */
31 edac_check_mc_devices();
32 edac_pci_do_parity_check();
33}
34
35/*
36 * Action thread for EDAC to perform the POLL operations
37 */
38static int edac_kernel_thread(void *arg)
39{
40 int msec;
41
42 while (!kthread_should_stop()) {
43
44 do_edac_check();
45
46 /* goto sleep for the interval */
47 msec = (HZ * edac_get_poll_msec()) / 1000;
48 schedule_timeout_interruptible(msec);
49 try_to_freeze();
50 }
51
52 return 0;
53}
54
55/*
56 * edac_init
57 * module initialization entry point
58 */
59static int __init edac_init(void)
60{
61 edac_printk(KERN_INFO, EDAC_MC, EDAC_MC_VERSION "\n");
62
63 /*
64 * Harvest and clear any boot/initialization PCI parity errors
65 *
66 * FIXME: This only clears errors logged by devices present at time of
67 * module initialization. We should also do an initial clear
68 * of each newly hotplugged device.
69 */
70 edac_pci_clear_parity_errors();
71
72 /* Create the MC sysfs entries */
73 if (edac_sysfs_memctrl_setup()) {
74 edac_printk(KERN_ERR, EDAC_MC,
75 "Error initializing sysfs code\n");
76 return -ENODEV;
77 }
78
79 /* Create the PCI parity sysfs entries */
80 if (edac_sysfs_pci_setup()) {
81 edac_sysfs_memctrl_teardown();
82 edac_printk(KERN_ERR, EDAC_MC,
83 "PCI: Error initializing sysfs code\n");
84 return -ENODEV;
85 }
86
87 /* create our kernel thread */
88 edac_thread = kthread_run(edac_kernel_thread, NULL, "kedac");
89
90 if (IS_ERR(edac_thread)) {
91 /* remove the sysfs entries */
92 edac_sysfs_memctrl_teardown();
93 edac_sysfs_pci_teardown();
94 return PTR_ERR(edac_thread);
95 }
96
97 return 0;
98}
99
100/*
101 * edac_exit()
102 * module exit/termination function
103 */
104static void __exit edac_exit(void)
105{
106 debugf0("%s()\n", __func__);
107 kthread_stop(edac_thread);
108
109 /* tear down the sysfs device */
110 edac_sysfs_memctrl_teardown();
111 edac_sysfs_pci_teardown();
112}
113
114/*
115 * Inform the kernel of our entry and exit points
116 */
117module_init(edac_init);
118module_exit(edac_exit);
119
120MODULE_LICENSE("GPL");
121MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
122MODULE_DESCRIPTION("Core library routines for EDAC reporting");
123
124/* refer to *_sysfs.c files for parameters that are exported via sysfs */
125
126#ifdef CONFIG_EDAC_DEBUG
127module_param(edac_debug_level, int, 0644);
128MODULE_PARM_DESC(edac_debug_level, "Debug level");
129#endif
130