LXR linux/drivers/edac/edac

   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 <bp@alien8.de>
   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
  32int edac_report_status = EDAC_REPORTING_ENABLED;
  33EXPORT_SYMBOL_GPL(edac_report_status);
  34
  35static int __init edac_report_setup(char *str)
  36{
  37        if (!str)
  38                return -EINVAL;
  39
  40        if (!strncmp(str, "on", 2))
  41                set_edac_report_status(EDAC_REPORTING_ENABLED);
  42        else if (!strncmp(str, "off", 3))
  43                set_edac_report_status(EDAC_REPORTING_DISABLED);
  44        else if (!strncmp(str, "force", 5))
  45                set_edac_report_status(EDAC_REPORTING_FORCE);
  46
  47        return 0;
  48}
  49__setup("edac_report=", edac_report_setup);
  50
  51/*
  52 * called to determine if there is an EDAC driver interested in
  53 * knowing an event (such as NMI) occurred
  54 */
  55int edac_handler_set(void)
  56{
  57        if (edac_op_state == EDAC_OPSTATE_POLL)
  58                return 0;
  59
  60        return atomic_read(&edac_handlers);
  61}
  62EXPORT_SYMBOL_GPL(edac_handler_set);
  63
  64/*
  65 * handler for NMI type of interrupts to assert error
  66 */
  67void edac_atomic_assert_error(void)
  68{
  69        edac_err_assert++;
  70}
  71EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
  72
  73/*
  74 * sysfs object: /sys/devices/system/edac
  75 *      need to export to other files
  76 */
  77struct bus_type edac_subsys = {
  78        .name = "edac",
  79        .dev_name = "edac",
  80};
  81EXPORT_SYMBOL_GPL(edac_subsys);
  82
  83/* return pointer to the 'edac' node in sysfs */
  84struct bus_type *edac_get_sysfs_subsys(void)
  85{
  86        int err = 0;
  87
  88        if (atomic_read(&edac_subsys_valid))
  89                goto out;
  90
  91        /* create the /sys/devices/system/edac directory */
  92        err = subsys_system_register(&edac_subsys, NULL);
  93        if (err) {
  94                printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
  95                return NULL;
  96        }
  97
  98out:
  99        atomic_inc(&edac_subsys_valid);
 100        return &edac_subsys;
 101}
 102EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
 103
 104void edac_put_sysfs_subsys(void)
 105{
 106        /* last user unregisters it */
 107        if (atomic_dec_and_test(&edac_subsys_valid))
 108                bus_unregister(&edac_subsys);
 109}
 110EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);
 111