2010-09-02 10:33:24 -06:00
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/*
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* A simple MCE injection facility for testing the MCE decoding code. This
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* driver should be built as module so that it can be loaded on production
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* kernels for testing purposes.
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*
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* This file may be distributed under the terms of the GNU General Public
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* License version 2.
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*
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* Copyright (c) 2010: Borislav Petkov <borislav.petkov@amd.com>
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* Advanced Micro Devices Inc.
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*/
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#include <linux/kobject.h>
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#include <linux/sysdev.h>
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#include <linux/edac.h>
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#include <asm/mce.h>
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2010-09-27 07:30:39 -06:00
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#include "mce_amd.h"
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2010-09-02 10:33:24 -06:00
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struct edac_mce_attr {
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struct attribute attr;
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ssize_t (*show) (struct kobject *kobj, struct edac_mce_attr *attr, char *buf);
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ssize_t (*store)(struct kobject *kobj, struct edac_mce_attr *attr,
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const char *buf, size_t count);
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};
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#define EDAC_MCE_ATTR(_name, _mode, _show, _store) \
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static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _store)
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static struct kobject *mce_kobj;
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/*
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* Collect all the MCi_XXX settings
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*/
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static struct mce i_mce;
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#define MCE_INJECT_STORE(reg) \
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static ssize_t edac_inject_##reg##_store(struct kobject *kobj, \
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struct edac_mce_attr *attr, \
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const char *data, size_t count)\
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{ \
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int ret = 0; \
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unsigned long value; \
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\
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ret = strict_strtoul(data, 16, &value); \
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if (ret < 0) \
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printk(KERN_ERR "Error writing MCE " #reg " field.\n"); \
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\
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i_mce.reg = value; \
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\
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return count; \
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}
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MCE_INJECT_STORE(status);
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MCE_INJECT_STORE(misc);
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MCE_INJECT_STORE(addr);
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#define MCE_INJECT_SHOW(reg) \
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static ssize_t edac_inject_##reg##_show(struct kobject *kobj, \
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struct edac_mce_attr *attr, \
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char *buf) \
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{ \
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return sprintf(buf, "0x%016llx\n", i_mce.reg); \
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}
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MCE_INJECT_SHOW(status);
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MCE_INJECT_SHOW(misc);
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MCE_INJECT_SHOW(addr);
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EDAC_MCE_ATTR(status, 0644, edac_inject_status_show, edac_inject_status_store);
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EDAC_MCE_ATTR(misc, 0644, edac_inject_misc_show, edac_inject_misc_store);
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EDAC_MCE_ATTR(addr, 0644, edac_inject_addr_show, edac_inject_addr_store);
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/*
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* This denotes into which bank we're injecting and triggers
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* the injection, at the same time.
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*/
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static ssize_t edac_inject_bank_store(struct kobject *kobj,
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struct edac_mce_attr *attr,
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const char *data, size_t count)
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{
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int ret = 0;
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unsigned long value;
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ret = strict_strtoul(data, 10, &value);
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if (ret < 0) {
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printk(KERN_ERR "Invalid bank value!\n");
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return -EINVAL;
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}
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if (value > 5) {
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printk(KERN_ERR "Non-existant MCE bank: %lu\n", value);
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return -EINVAL;
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}
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i_mce.bank = value;
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amd_decode_mce(NULL, 0, &i_mce);
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return count;
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}
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static ssize_t edac_inject_bank_show(struct kobject *kobj,
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struct edac_mce_attr *attr, char *buf)
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{
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return sprintf(buf, "%d\n", i_mce.bank);
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}
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EDAC_MCE_ATTR(bank, 0644, edac_inject_bank_show, edac_inject_bank_store);
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static struct edac_mce_attr *sysfs_attrs[] = { &mce_attr_status, &mce_attr_misc,
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&mce_attr_addr, &mce_attr_bank
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};
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static int __init edac_init_mce_inject(void)
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{
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struct sysdev_class *edac_class = NULL;
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int i, err = 0;
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edac_class = edac_get_sysfs_class();
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if (!edac_class)
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return -EINVAL;
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mce_kobj = kobject_create_and_add("mce", &edac_class->kset.kobj);
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if (!mce_kobj) {
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printk(KERN_ERR "Error creating a mce kset.\n");
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err = -ENOMEM;
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goto err_mce_kobj;
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}
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for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) {
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err = sysfs_create_file(mce_kobj, &sysfs_attrs[i]->attr);
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if (err) {
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printk(KERN_ERR "Error creating %s in sysfs.\n",
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sysfs_attrs[i]->attr.name);
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goto err_sysfs_create;
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}
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}
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return 0;
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err_sysfs_create:
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2010-11-18 20:05:43 -07:00
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while (--i >= 0)
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2010-09-02 10:33:24 -06:00
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sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
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kobject_del(mce_kobj);
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err_mce_kobj:
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edac_put_sysfs_class();
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return err;
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}
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static void __exit edac_exit_mce_inject(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++)
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sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
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kobject_del(mce_kobj);
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edac_put_sysfs_class();
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}
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module_init(edac_init_mce_inject);
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module_exit(edac_exit_mce_inject);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Borislav Petkov <borislav.petkov@amd.com>");
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MODULE_AUTHOR("AMD Inc.");
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MODULE_DESCRIPTION("MCE injection facility for testing MCE decoding");
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