LXR linux/drivers/edac/edac

   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
  22static 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 */
  39int edac_debug_level = 2;
  40EXPORT_SYMBOL_GPL(edac_debug_level);
  41
  42module_param_call(edac_debug_level, edac_set_debug_level, param_get_int,
  43                  &edac_debug_level, 0644);
  44MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2");
  45#endif
  46
  47/*
  48 * edac_op_state_to_string()
  49 */
  50char *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 */
  70static struct bus_type edac_subsys = {
  71        .name = "edac",
  72        .dev_name = "edac",
  73};
  74
  75static 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
  87static void edac_subsys_exit(void)
  88{
  89        bus_unregister(&edac_subsys);
  90}
  91
  92/* return pointer to the 'edac' node in sysfs */
  93struct bus_type *edac_get_sysfs_subsys(void)
  94{
  95        return &edac_subsys;
  96}
  97EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
  98/*
  99 * edac_init
 100 *      module initialization entry point
 101 */
 102static 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
 135err_wq:
 136        edac_debugfs_exit();
 137        edac_mc_sysfs_exit();
 138
 139err_sysfs:
 140        edac_subsys_exit();
 141
 142        return err;
 143}
 144
 145/*
 146 * edac_exit()
 147 *      module exit/termination function
 148 */
 149static 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 */
 163subsys_initcall(edac_init);
 164module_exit(edac_exit);
 165
 166MODULE_LICENSE("GPL");
 167MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
 168MODULE_DESCRIPTION("Core library routines for EDAC reporting");
 169