linux/drivers/edac/mce_amd_inj.c
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   1/*
   2 * A simple MCE injection facility for testing the MCE decoding code. This
   3 * driver should be built as module so that it can be loaded on production
   4 * kernels for testing purposes.
   5 *
   6 * This file may be distributed under the terms of the GNU General Public
   7 * License version 2.
   8 *
   9 * Copyright (c) 2010:  Borislav Petkov <borislav.petkov@amd.com>
  10 *                      Advanced Micro Devices Inc.
  11 */
  12
  13#include <linux/kobject.h>
  14#include <linux/sysdev.h>
  15#include <linux/edac.h>
  16#include <asm/mce.h>
  17
  18#include "mce_amd.h"
  19
  20struct edac_mce_attr {
  21        struct attribute attr;
  22        ssize_t (*show) (struct kobject *kobj, struct edac_mce_attr *attr, char *buf);
  23        ssize_t (*store)(struct kobject *kobj, struct edac_mce_attr *attr,
  24                         const char *buf, size_t count);
  25};
  26
  27#define EDAC_MCE_ATTR(_name, _mode, _show, _store)                      \
  28static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _store)
  29
  30static struct kobject *mce_kobj;
  31
  32/*
  33 * Collect all the MCi_XXX settings
  34 */
  35static struct mce i_mce;
  36
  37#define MCE_INJECT_STORE(reg)                                           \
  38static ssize_t edac_inject_##reg##_store(struct kobject *kobj,          \
  39                                         struct edac_mce_attr *attr,    \
  40                                         const char *data, size_t count)\
  41{                                                                       \
  42        int ret = 0;                                                    \
  43        unsigned long value;                                            \
  44                                                                        \
  45        ret = strict_strtoul(data, 16, &value);                         \
  46        if (ret < 0)                                                    \
  47                printk(KERN_ERR "Error writing MCE " #reg " field.\n"); \
  48                                                                        \
  49        i_mce.reg = value;                                              \
  50                                                                        \
  51        return count;                                                   \
  52}
  53
  54MCE_INJECT_STORE(status);
  55MCE_INJECT_STORE(misc);
  56MCE_INJECT_STORE(addr);
  57
  58#define MCE_INJECT_SHOW(reg)                                            \
  59static ssize_t edac_inject_##reg##_show(struct kobject *kobj,           \
  60                                        struct edac_mce_attr *attr,     \
  61                                        char *buf)                      \
  62{                                                                       \
  63        return sprintf(buf, "0x%016llx\n", i_mce.reg);                  \
  64}
  65
  66MCE_INJECT_SHOW(status);
  67MCE_INJECT_SHOW(misc);
  68MCE_INJECT_SHOW(addr);
  69
  70EDAC_MCE_ATTR(status, 0644, edac_inject_status_show, edac_inject_status_store);
  71EDAC_MCE_ATTR(misc, 0644, edac_inject_misc_show, edac_inject_misc_store);
  72EDAC_MCE_ATTR(addr, 0644, edac_inject_addr_show, edac_inject_addr_store);
  73
  74/*
  75 * This denotes into which bank we're injecting and triggers
  76 * the injection, at the same time.
  77 */
  78static ssize_t edac_inject_bank_store(struct kobject *kobj,
  79                                      struct edac_mce_attr *attr,
  80                                      const char *data, size_t count)
  81{
  82        int ret = 0;
  83        unsigned long value;
  84
  85        ret = strict_strtoul(data, 10, &value);
  86        if (ret < 0) {
  87                printk(KERN_ERR "Invalid bank value!\n");
  88                return -EINVAL;
  89        }
  90
  91        if (value > 5)
  92                if (boot_cpu_data.x86 != 0x15 || value > 6) {
  93                        printk(KERN_ERR "Non-existant MCE bank: %lu\n", value);
  94                        return -EINVAL;
  95                }
  96
  97        i_mce.bank = value;
  98
  99        amd_decode_mce(NULL, 0, &i_mce);
 100
 101        return count;
 102}
 103
 104static ssize_t edac_inject_bank_show(struct kobject *kobj,
 105                                     struct edac_mce_attr *attr, char *buf)
 106{
 107        return sprintf(buf, "%d\n", i_mce.bank);
 108}
 109
 110EDAC_MCE_ATTR(bank, 0644, edac_inject_bank_show, edac_inject_bank_store);
 111
 112static struct edac_mce_attr *sysfs_attrs[] = { &mce_attr_status, &mce_attr_misc,
 113                                               &mce_attr_addr, &mce_attr_bank
 114};
 115
 116static int __init edac_init_mce_inject(void)
 117{
 118        struct sysdev_class *edac_class = NULL;
 119        int i, err = 0;
 120
 121        edac_class = edac_get_sysfs_class();
 122        if (!edac_class)
 123                return -EINVAL;
 124
 125        mce_kobj = kobject_create_and_add("mce", &edac_class->kset.kobj);
 126        if (!mce_kobj) {
 127                printk(KERN_ERR "Error creating a mce kset.\n");
 128                err = -ENOMEM;
 129                goto err_mce_kobj;
 130        }
 131
 132        for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) {
 133                err = sysfs_create_file(mce_kobj, &sysfs_attrs[i]->attr);
 134                if (err) {
 135                        printk(KERN_ERR "Error creating %s in sysfs.\n",
 136                                        sysfs_attrs[i]->attr.name);
 137                        goto err_sysfs_create;
 138                }
 139        }
 140        return 0;
 141
 142err_sysfs_create:
 143        while (--i >= 0)
 144                sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
 145
 146        kobject_del(mce_kobj);
 147
 148err_mce_kobj:
 149        edac_put_sysfs_class();
 150
 151        return err;
 152}
 153
 154static void __exit edac_exit_mce_inject(void)
 155{
 156        int i;
 157
 158        for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++)
 159                sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
 160
 161        kobject_del(mce_kobj);
 162
 163        edac_put_sysfs_class();
 164}
 165
 166module_init(edac_init_mce_inject);
 167module_exit(edac_exit_mce_inject);
 168
 169MODULE_LICENSE("GPL");
 170MODULE_AUTHOR("Borislav Petkov <borislav.petkov@amd.com>");
 171MODULE_AUTHOR("AMD Inc.");
 172MODULE_DESCRIPTION("MCE injection facility for testing MCE decoding");
 173