drivers/edac/edac_module.c

   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
  22 static 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 */
  38 int edac_debug_level = 2;
  39 EXPORT_SYMBOL_GPL(edac_debug_level);
  40
  41 module_param_call(edac_debug_level, edac_set_debug_level, param_get_int,
  42                   &edac_debug_level, 0644);
  43 MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2");
  44 #endif
  45
  46 /* scope is to module level only */
  47 struct workqueue_struct *edac_workqueue;
  48
  49 /*
  50  * edac_op_state_to_string()
  51  */
  52 char *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  */
  72 static 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  */
  85 static 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  */
  98 static 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
 127 err_wq:
 128         edac_debugfs_exit();
 129         edac_mc_sysfs_exit();
 130
 131 err_sysfs:
 132         return err;
 133 }
 134
 135 /*
 136  * edac_exit()
 137  *      module exit/termination function
 138  */
 139 static 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  */
 152 subsys_initcall(edac_init);
 153 module_exit(edac_exit);
 154
 155 MODULE_LICENSE("GPL");
 156 MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
 157 MODULE_DESCRIPTION("Core library routines for EDAC reporting");