| /* |
| * 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 kenrel sysfs interface"); |
| MODULE_LICENSE("GPL"); |