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: 2.1.0 " __DATE__
  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  */
  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  */
  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  */
  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  */
  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  */
 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