/* * A simple MCE injection facility for testing the MCE decoding code. This * driver should be built as module so that it can be loaded on production * kernels for testing purposes. * * This file may be distributed under the terms of the GNU General Public * License version 2. * * Copyright (c) 2010: Borislav Petkov <borislav.petkov@amd.com> * Advanced Micro Devices Inc. */ #include <linux/kobject.h> #include <linux/edac.h> #include <linux/module.h> #include <asm/mce.h> #include "mce_amd.h" struct edac_mce_attr { struct attribute attr; ssize_t (*show) (struct kobject *kobj, struct edac_mce_attr *attr, char *buf); ssize_t (*store)(struct kobject *kobj, struct edac_mce_attr *attr, const char *buf, size_t count); }; #define EDAC_MCE_ATTR(_name, _mode, _show, _store) \ static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _store) static struct kobject *mce_kobj; /* * Collect all the MCi_XXX settings */ static struct mce i_mce; #define MCE_INJECT_STORE(reg) \ static ssize_t edac_inject_##reg##_store(struct kobject *kobj, \ struct edac_mce_attr *attr, \ const char *data, size_t count)\ { \ int ret = 0; \ unsigned long value; \ \ ret = strict_strtoul(data, 16, &value); \ if (ret < 0) \ printk(KERN_ERR "Error writing MCE " #reg " field.\n"); \ \ i_mce.reg = value; \ \ return count; \ } MCE_INJECT_STORE(status); MCE_INJECT_STORE(misc); MCE_INJECT_STORE(addr); #define MCE_INJECT_SHOW(reg) \ static ssize_t edac_inject_##reg##_show(struct kobject *kobj, \ struct edac_mce_attr *attr, \ char *buf) \ { \ return sprintf(buf, "0x%016llx\n", i_mce.reg); \ } MCE_INJECT_SHOW(status); MCE_INJECT_SHOW(misc); MCE_INJECT_SHOW(addr); EDAC_MCE_ATTR(status, 0644, edac_inject_status_show, edac_inject_status_store); EDAC_MCE_ATTR(misc, 0644, edac_inject_misc_show, edac_inject_misc_store); EDAC_MCE_ATTR(addr, 0644, edac_inject_addr_show, edac_inject_addr_store); /* * This denotes into which bank we're injecting and triggers * the injection, at the same time. */ static ssize_t edac_inject_bank_store(struct kobject *kobj, struct edac_mce_attr *attr, const char *data, size_t count) { int ret = 0; unsigned long value; ret = strict_strtoul(data, 10, &value); if (ret < 0) { printk(KERN_ERR "Invalid bank value!\n"); return -EINVAL; } if (value > 5) if (boot_cpu_data.x86 != 0x15 || value > 6) { printk(KERN_ERR "Non-existent MCE bank: %lu\n", value); return -EINVAL; } i_mce.bank = value; amd_decode_mce(NULL, 0, &i_mce); return count; } static ssize_t edac_inject_bank_show(struct kobject *kobj, struct edac_mce_attr *attr, char *buf) { return sprintf(buf, "%d\n", i_mce.bank); } EDAC_MCE_ATTR(bank, 0644, edac_inject_bank_show, edac_inject_bank_store); static struct edac_mce_attr *sysfs_attrs[] = { &mce_attr_status, &mce_attr_misc, &mce_attr_addr, &mce_attr_bank }; static int __init edac_init_mce_inject(void) { struct bus_type *edac_subsys = NULL; int i, err = 0; edac_subsys = edac_get_sysfs_subsys(); if (!edac_subsys) return -EINVAL; mce_kobj = kobject_create_and_add("mce", &edac_subsys->dev_root->kobj); if (!mce_kobj) { printk(KERN_ERR "Error creating a mce kset.\n"); err = -ENOMEM; goto err_mce_kobj; } for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) { err = sysfs_create_file(mce_kobj, &sysfs_attrs[i]->attr); if (err) { printk(KERN_ERR "Error creating %s in sysfs.\n", sysfs_attrs[i]->attr.name); goto err_sysfs_create; } } return 0; err_sysfs_create: while (--i >= 0) sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr); kobject_del(mce_kobj); err_mce_kobj: edac_put_sysfs_subsys(); return err; } static void __exit edac_exit_mce_inject(void) { int i; for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr); kobject_del(mce_kobj); edac_put_sysfs_subsys(); } module_init(edac_init_mce_inject); module_exit(edac_exit_mce_inject); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Borislav Petkov <borislav.petkov@amd.com>"); MODULE_AUTHOR("AMD Inc."); MODULE_DESCRIPTION("MCE injection facility for testing MCE decoding");