/* * err_inject.c - * 1.) Inject errors to a processor. * 2.) Query error injection capabilities. * This driver along with user space code can be acting as an error * injection tool. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation * Copyright (C) 2006, Intel Corp. All rights reserved. * */ #include <linux/sysdev.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/cpu.h> #include <linux/module.h> #define ERR_INJ_DEBUG #define ERR_DATA_BUFFER_SIZE 3 // Three 8-byte; #define define_one_ro(name) \ static SYSDEV_ATTR(name, 0444, show_##name, NULL) #define define_one_rw(name) \ static SYSDEV_ATTR(name, 0644, show_##name, store_##name) static u64 call_start[NR_CPUS]; static u64 phys_addr[NR_CPUS]; static u64 err_type_info[NR_CPUS]; static u64 err_struct_info[NR_CPUS]; static struct { u64 data1; u64 data2; u64 data3; } __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS]; static s64 status[NR_CPUS]; static u64 capabilities[NR_CPUS]; static u64 resources[NR_CPUS]; #define show(name) \ static ssize_t \ show_##name(struct sys_device *dev, char *buf) \ { \ u32 cpu=dev->id; \ return sprintf(buf, "%lx\n", name[cpu]); \ } #define store(name) \ static ssize_t \ store_##name(struct sys_device *dev, const char *buf, size_t size) \ { \ unsigned int cpu=dev->id; \ name[cpu] = simple_strtoull(buf, NULL, 16); \ return size; \ } show(call_start) /* It's user's responsibility to call the PAL procedure on a specific * processor. The cpu number in driver is only used for storing data. */ static ssize_t store_call_start(struct sys_device *dev, const char *buf, size_t size) { unsigned int cpu=dev->id; unsigned long call_start = simple_strtoull(buf, NULL, 16); #ifdef ERR_INJ_DEBUG printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu); printk(KERN_DEBUG "err_type_info=%lx,\n", err_type_info[cpu]); printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]); printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\n", err_data_buffer[cpu].data1, err_data_buffer[cpu].data2, err_data_buffer[cpu].data3); #endif switch (call_start) { case 0: /* Do nothing. */ break; case 1: /* Call pal_mc_error_inject in physical mode. */ status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu], err_struct_info[cpu], ia64_tpa(&err_data_buffer[cpu]), &capabilities[cpu], &resources[cpu]); break; case 2: /* Call pal_mc_error_inject in virtual mode. */ status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu], err_struct_info[cpu], ia64_tpa(&err_data_buffer[cpu]), &capabilities[cpu], &resources[cpu]); break; default: status[cpu] = -EINVAL; break; } #ifdef ERR_INJ_DEBUG printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]); printk(KERN_DEBUG "capapbilities=%lx,\n", capabilities[cpu]); printk(KERN_DEBUG "resources=%lx\n", resources[cpu]); #endif return size; } show(err_type_info) store(err_type_info) static ssize_t show_virtual_to_phys(struct sys_device *dev, char *buf) { unsigned int cpu=dev->id; return sprintf(buf, "%lx\n", phys_addr[cpu]); } static ssize_t store_virtual_to_phys(struct sys_device *dev, const char *buf, size_t size) { unsigned int cpu=dev->id; u64 virt_addr=simple_strtoull(buf, NULL, 16); int ret; ret = get_user_pages(current, current->mm, virt_addr, 1, VM_READ, 0, NULL, NULL); if (ret<=0) { #ifdef ERR_INJ_DEBUG printk("Virtual address %lx is not existing.\n",virt_addr); #endif return -EINVAL; } phys_addr[cpu] = ia64_tpa(virt_addr); return size; } show(err_struct_info) store(err_struct_info) static ssize_t show_err_data_buffer(struct sys_device *dev, char *buf) { unsigned int cpu=dev->id; return sprintf(buf, "%lx, %lx, %lx\n", err_data_buffer[cpu].data1, err_data_buffer[cpu].data2, err_data_buffer[cpu].data3); } static ssize_t store_err_data_buffer(struct sys_device *dev, const char *buf, size_t size) { unsigned int cpu=dev->id; int ret; #ifdef ERR_INJ_DEBUG printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n", err_data_buffer[cpu].data1, err_data_buffer[cpu].data2, err_data_buffer[cpu].data3, cpu); #endif ret=sscanf(buf, "%lx, %lx, %lx", &err_data_buffer[cpu].data1, &err_data_buffer[cpu].data2, &err_data_buffer[cpu].data3); if (ret!=ERR_DATA_BUFFER_SIZE) return -EINVAL; return size; } show(status) show(capabilities) show(resources) define_one_rw(call_start); define_one_rw(err_type_info); define_one_rw(err_struct_info); define_one_rw(err_data_buffer); define_one_rw(virtual_to_phys); define_one_ro(status); define_one_ro(capabilities); define_one_ro(resources); static struct attribute *default_attrs[] = { &attr_call_start.attr, &attr_virtual_to_phys.attr, &attr_err_type_info.attr, &attr_err_struct_info.attr, &attr_err_data_buffer.attr, &attr_status.attr, &attr_capabilities.attr, &attr_resources.attr, NULL }; static struct attribute_group err_inject_attr_group = { .attrs = default_attrs, .name = "err_inject" }; /* Add/Remove err_inject interface for CPU device */ static int __cpuinit err_inject_add_dev(struct sys_device * sys_dev) { return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group); } static int __cpuinit err_inject_remove_dev(struct sys_device * sys_dev) { sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); return 0; } static int __cpuinit err_inject_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { unsigned int cpu = (unsigned long)hcpu; struct sys_device *sys_dev; sys_dev = get_cpu_sysdev(cpu); switch (action) { case CPU_ONLINE: case CPU_ONLINE_FROZEN: err_inject_add_dev(sys_dev); break; case CPU_DEAD: case CPU_DEAD_FROZEN: err_inject_remove_dev(sys_dev); break; } return NOTIFY_OK; } static struct notifier_block __cpuinitdata err_inject_cpu_notifier = { .notifier_call = err_inject_cpu_callback, }; static int __init err_inject_init(void) { int i; #ifdef ERR_INJ_DEBUG printk(KERN_INFO "Enter error injection driver.\n"); #endif for_each_online_cpu(i) { err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE, (void *)(long)i); } register_hotcpu_notifier(&err_inject_cpu_notifier); return 0; } static void __exit err_inject_exit(void) { int i; struct sys_device *sys_dev; #ifdef ERR_INJ_DEBUG printk(KERN_INFO "Exit error injection driver.\n"); #endif for_each_online_cpu(i) { sys_dev = get_cpu_sysdev(i); sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); } unregister_hotcpu_notifier(&err_inject_cpu_notifier); } module_init(err_inject_init); module_exit(err_inject_exit); MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); MODULE_DESCRIPTION("MC error injection kernel sysfs interface"); MODULE_LICENSE("GPL");