linux/drivers/edac/edac_stub.c
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   1/*
   2 * common EDAC components that must be in kernel
   3 *
   4 * Author: Dave Jiang <djiang@mvista.com>
   5 *
   6 * 2007 (c) MontaVista Software, Inc.
   7 * 2010 (c) Advanced Micro Devices Inc.
   8 *          Borislav Petkov <borislav.petkov@amd.com>
   9 *
  10 * This file is licensed under the terms of the GNU General Public
  11 * License version 2. This program is licensed "as is" without any
  12 * warranty of any kind, whether express or implied.
  13 *
  14 */
  15#include <linux/module.h>
  16#include <linux/edac.h>
  17#include <asm/atomic.h>
  18#include <asm/edac.h>
  19
  20int edac_op_state = EDAC_OPSTATE_INVAL;
  21EXPORT_SYMBOL_GPL(edac_op_state);
  22
  23atomic_t edac_handlers = ATOMIC_INIT(0);
  24EXPORT_SYMBOL_GPL(edac_handlers);
  25
  26int edac_err_assert = 0;
  27EXPORT_SYMBOL_GPL(edac_err_assert);
  28
  29static atomic_t edac_class_valid = ATOMIC_INIT(0);
  30
  31/*
  32 * called to determine if there is an EDAC driver interested in
  33 * knowing an event (such as NMI) occurred
  34 */
  35int edac_handler_set(void)
  36{
  37        if (edac_op_state == EDAC_OPSTATE_POLL)
  38                return 0;
  39
  40        return atomic_read(&edac_handlers);
  41}
  42EXPORT_SYMBOL_GPL(edac_handler_set);
  43
  44/*
  45 * handler for NMI type of interrupts to assert error
  46 */
  47void edac_atomic_assert_error(void)
  48{
  49        edac_err_assert++;
  50}
  51EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
  52
  53/*
  54 * sysfs object: /sys/devices/system/edac
  55 *      need to export to other files
  56 */
  57struct sysdev_class edac_class = {
  58        .name = "edac",
  59};
  60EXPORT_SYMBOL_GPL(edac_class);
  61
  62/* return pointer to the 'edac' node in sysfs */
  63struct sysdev_class *edac_get_sysfs_class(void)
  64{
  65        int err = 0;
  66
  67        if (atomic_read(&edac_class_valid))
  68                goto out;
  69
  70        /* create the /sys/devices/system/edac directory */
  71        err = sysdev_class_register(&edac_class);
  72        if (err) {
  73                printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
  74                return NULL;
  75        }
  76
  77out:
  78        atomic_inc(&edac_class_valid);
  79        return &edac_class;
  80}
  81EXPORT_SYMBOL_GPL(edac_get_sysfs_class);
  82
  83void edac_put_sysfs_class(void)
  84{
  85        /* last user unregisters it */
  86        if (atomic_dec_and_test(&edac_class_valid))
  87                sysdev_class_unregister(&edac_class);
  88}
  89EXPORT_SYMBOL_GPL(edac_put_sysfs_class);
  90