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 <linux/atomic.h>
  18#include <linux/device.h>
  19#include <asm/edac.h>
  20
  21int edac_op_state = EDAC_OPSTATE_INVAL;
  22EXPORT_SYMBOL_GPL(edac_op_state);
  23
  24atomic_t edac_handlers = ATOMIC_INIT(0);
  25EXPORT_SYMBOL_GPL(edac_handlers);
  26
  27int edac_err_assert = 0;
  28EXPORT_SYMBOL_GPL(edac_err_assert);
  29
  30static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
  31
  32/*
  33 * called to determine if there is an EDAC driver interested in
  34 * knowing an event (such as NMI) occurred
  35 */
  36int edac_handler_set(void)
  37{
  38        if (edac_op_state == EDAC_OPSTATE_POLL)
  39                return 0;
  40
  41        return atomic_read(&edac_handlers);
  42}
  43EXPORT_SYMBOL_GPL(edac_handler_set);
  44
  45/*
  46 * handler for NMI type of interrupts to assert error
  47 */
  48void edac_atomic_assert_error(void)
  49{
  50        edac_err_assert++;
  51}
  52EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
  53
  54/*
  55 * sysfs object: /sys/devices/system/edac
  56 *      need to export to other files
  57 */
  58struct bus_type edac_subsys = {
  59        .name = "edac",
  60        .dev_name = "edac",
  61};
  62EXPORT_SYMBOL_GPL(edac_subsys);
  63
  64/* return pointer to the 'edac' node in sysfs */
  65struct bus_type *edac_get_sysfs_subsys(void)
  66{
  67        int err = 0;
  68
  69        if (atomic_read(&edac_subsys_valid))
  70                goto out;
  71
  72        /* create the /sys/devices/system/edac directory */
  73        err = subsys_system_register(&edac_subsys, NULL);
  74        if (err) {
  75                printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
  76                return NULL;
  77        }
  78
  79out:
  80        atomic_inc(&edac_subsys_valid);
  81        return &edac_subsys;
  82}
  83EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
  84
  85void edac_put_sysfs_subsys(void)
  86{
  87        /* last user unregisters it */
  88        if (atomic_dec_and_test(&edac_subsys_valid))
  89                bus_unregister(&edac_subsys);
  90}
  91EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);
  92
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