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/device.h>
  15#include <linux/edac.h>
  16#include <linux/module.h>
  17#include <asm/mce.h>
  18
  19#include "mce_amd.h"
  20
  21struct edac_mce_attr {
  22        struct attribute attr;
  23        ssize_t (*show) (struct kobject *kobj, struct edac_mce_attr *attr, char *buf);
  24        ssize_t (*store)(struct kobject *kobj, struct edac_mce_attr *attr,
  25                         const char *buf, size_t count);
  26};
  27
  28#define EDAC_MCE_ATTR(_name, _mode, _show, _store)                      \
  29static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _store)
  30
  31static struct kobject *mce_kobj;
  32
  33/*
  34 * Collect all the MCi_XXX settings
  35 */
  36static struct mce i_mce;
  37
  38#define MCE_INJECT_STORE(reg)                                           \
  39static ssize_t edac_inject_##reg##_store(struct kobject *kobj,          \
  40                                         struct edac_mce_attr *attr,    \
  41                                         const char *data, size_t count)\
  42{                                                                       \
  43        int ret = 0;                                                    \
  44        unsigned long value;                                            \
  45                                                                        \
  46        ret = strict_strtoul(data, 16, &value);                         \
  47        if (ret < 0)                                                    \
  48                printk(KERN_ERR "Error writing MCE " #reg " field.\n"); \
  49                                                                        \
  50        i_mce.reg = value;                                              \
  51                                                                        \
  52        return count;                                                   \
  53}
  54
  55MCE_INJECT_STORE(status);
  56MCE_INJECT_STORE(misc);
  57MCE_INJECT_STORE(addr);
  58
  59#define MCE_INJECT_SHOW(reg)                                            \
  60static ssize_t edac_inject_##reg##_show(struct kobject *kobj,           \
  61                                        struct edac_mce_attr *attr,     \
  62                                        char *buf)                      \
  63{                                                                       \
  64        return sprintf(buf, "0x%016llx\n", i_mce.reg);                  \
  65}
  66
  67MCE_INJECT_SHOW(status);
  68MCE_INJECT_SHOW(misc);
  69MCE_INJECT_SHOW(addr);
  70
  71EDAC_MCE_ATTR(status, 0644, edac_inject_status_show, edac_inject_status_store);
  72EDAC_MCE_ATTR(misc, 0644, edac_inject_misc_show, edac_inject_misc_store);
  73EDAC_MCE_ATTR(addr, 0644, edac_inject_addr_show, edac_inject_addr_store);
  74
  75/*
  76 * This denotes into which bank we're injecting and triggers
  77 * the injection, at the same time.
  78 */
  79static ssize_t edac_inject_bank_store(struct kobject *kobj,
  80                                      struct edac_mce_attr *attr,
  81                                      const char *data, size_t count)
  82{
  83        int ret = 0;
  84        unsigned long value;
  85
  86        ret = strict_strtoul(data, 10, &value);
  87        if (ret < 0) {
  88                printk(KERN_ERR "Invalid bank value!\n");
  89                return -EINVAL;
  90        }
  91
  92        if (value > 5)
  93                if (boot_cpu_data.x86 != 0x15 || value > 6) {
  94                        printk(KERN_ERR "Non-existent MCE bank: %lu\n", value);
  95                        return -EINVAL;
  96                }
  97
  98        i_mce.bank = value;
  99
 100        amd_decode_mce(NULL, 0, &i_mce);
 101
 102        return count;
 103}
 104
 105static ssize_t edac_inject_bank_show(struct kobject *kobj,
 106                                     struct edac_mce_attr *attr, char *buf)
 107{
 108        return sprintf(buf, "%d\n", i_mce.bank);
 109}
 110
 111EDAC_MCE_ATTR(bank, 0644, edac_inject_bank_show, edac_inject_bank_store);
 112
 113static struct edac_mce_attr *sysfs_attrs[] = { &mce_attr_status, &mce_attr_misc,
 114                                               &mce_attr_addr, &mce_attr_bank
 115};
 116
 117static int __init edac_init_mce_inject(void)
 118{
 119        struct bus_type *edac_subsys = NULL;
 120        int i, err = 0;
 121
 122        edac_subsys = edac_get_sysfs_subsys();
 123        if (!edac_subsys)
 124                return -EINVAL;
 125
 126        mce_kobj = kobject_create_and_add("mce", &edac_subsys->dev_root->kobj);
 127        if (!mce_kobj) {
 128                printk(KERN_ERR "Error creating a mce kset.\n");
 129                err = -ENOMEM;
 130                goto err_mce_kobj;
 131        }
 132
 133        for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) {
 134                err = sysfs_create_file(mce_kobj, &sysfs_attrs[i]->attr);
 135                if (err) {
 136                        printk(KERN_ERR "Error creating %s in sysfs.\n",
 137                                        sysfs_attrs[i]->attr.name);
 138                        goto err_sysfs_create;
 139                }
 140        }
 141        return 0;
 142
 143err_sysfs_create:
 144        while (--i >= 0)
 145                sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
 146
 147        kobject_del(mce_kobj);
 148
 149err_mce_kobj:
 150        edac_put_sysfs_subsys();
 151
 152        return err;
 153}
 154
 155static void __exit edac_exit_mce_inject(void)
 156{
 157        int i;
 158
 159        for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++)
 160                sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
 161
 162        kobject_del(mce_kobj);
 163
 164        edac_put_sysfs_subsys();
 165}
 166
 167module_init(edac_init_mce_inject);
 168module_exit(edac_exit_mce_inject);
 169
 170MODULE_LICENSE("GPL");
 171MODULE_AUTHOR("Borislav Petkov <borislav.petkov@amd.com>");
 172MODULE_AUTHOR("AMD Inc.");
 173MODULE_DESCRIPTION("MCE injection facility for testing MCE decoding");
 174
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