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_mc.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,
  23                                 const struct kernel_param *kp)
  24 {
  25         unsigned long val;
  26         int ret;
  27
  28         ret = kstrtoul(buf, 0, &val);
  29         if (ret)
  30                 return ret;
  31
  32         if (val > 4)
  33                 return -EINVAL;
  34
  35         return param_set_int(buf, kp);
  36 }
  37
  38 /* Values of 0 to 4 will generate output */
  39 int edac_debug_level = 2;
  40 EXPORT_SYMBOL_GPL(edac_debug_level);
  41
  42 module_param_call(edac_debug_level, edac_set_debug_level, param_get_int,
  43                   &edac_debug_level, 0644);
  44 MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2");
  45 #endif
  46
  47 /*
  48  * edac_op_state_to_string()
  49  */
  50 char *edac_op_state_to_string(int opstate)
  51 {
  52         if (opstate == OP_RUNNING_POLL)
  53                 return "POLLED";
  54         else if (opstate == OP_RUNNING_INTERRUPT)
  55                 return "INTERRUPT";
  56         else if (opstate == OP_RUNNING_POLL_INTR)
  57                 return "POLL-INTR";
  58         else if (opstate == OP_ALLOC)
  59                 return "ALLOC";
  60         else if (opstate == OP_OFFLINE)
  61                 return "OFFLINE";
  62
  63         return "UNKNOWN";
  64 }
  65
  66 /*
  67  * sysfs object: /sys/devices/system/edac
  68  *      need to export to other files
  69  */
  70 static struct bus_type edac_subsys = {
  71         .name = "edac",
  72         .dev_name = "edac",
  73 };
  74
  75 static int edac_subsys_init(void)
  76 {
  77         int err;
  78
  79         /* create the /sys/devices/system/edac directory */
  80         err = subsys_system_register(&edac_subsys, NULL);
  81         if (err)
  82                 printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
  83
  84         return err;
  85 }
  86
  87 static void edac_subsys_exit(void)
  88 {
  89         bus_unregister(&edac_subsys);
  90 }
  91
  92 /* return pointer to the 'edac' node in sysfs */
  93 struct bus_type *edac_get_sysfs_subsys(void)
  94 {
  95         return &edac_subsys;
  96 }
  97 EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
  98 /*
  99  * edac_init
 100  *      module initialization entry point
 101  */
 102 static int __init edac_init(void)
 103 {
 104         int err = 0;
 105
 106         edac_printk(KERN_INFO, EDAC_MC, EDAC_VERSION "\n");
 107
 108         err = edac_subsys_init();
 109         if (err)
 110                 return err;
 111
 112         /*
 113          * Harvest and clear any boot/initialization PCI parity errors
 114          *
 115          * FIXME: This only clears errors logged by devices present at time of
 116          *      module initialization.  We should also do an initial clear
 117          *      of each newly hotplugged device.
 118          */
 119         edac_pci_clear_parity_errors();
 120
 121         err = edac_mc_sysfs_init();
 122         if (err)
 123                 goto err_sysfs;
 124
 125         edac_debugfs_init();
 126
 127         err = edac_workqueue_setup();
 128         if (err) {
 129                 edac_printk(KERN_ERR, EDAC_MC, "Failure initializing workqueue\n");
 130                 goto err_wq;
 131         }
 132
 133         return 0;
 134
 135 err_wq:
 136         edac_debugfs_exit();
 137         edac_mc_sysfs_exit();
 138
 139 err_sysfs:
 140         edac_subsys_exit();
 141
 142         return err;
 143 }
 144
 145 /*
 146  * edac_exit()
 147  *      module exit/termination function
 148  */
 149 static void __exit edac_exit(void)
 150 {
 151         edac_dbg(0, "\n");
 152
 153         /* tear down the various subsystems */
 154         edac_workqueue_teardown();
 155         edac_mc_sysfs_exit();
 156         edac_debugfs_exit();
 157         edac_subsys_exit();
 158 }
 159
 160 /*
 161  * Inform the kernel of our entry and exit points
 162  */
 163 subsys_initcall(edac_init);
 164 module_exit(edac_exit);
 165
 166 MODULE_LICENSE("GPL");
 167 MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
 168 MODULE_DESCRIPTION("Core library routines for EDAC reporting");