1/* 2 * err_inject.c - 3 * 1.) Inject errors to a processor. 4 * 2.) Query error injection capabilities. 5 * This driver along with user space code can be acting as an error 6 * injection tool. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 16 * NON INFRINGEMENT. See the GNU General Public License for more 17 * details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * 23 * Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation 24 * Copyright (C) 2006, Intel Corp. All rights reserved. 25 * 26 */ 27#include <linux/sysdev.h> 28#include <linux/init.h> 29#include <linux/mm.h> 30#include <linux/cpu.h> 31#include <linux/module.h> 32 33#define ERR_INJ_DEBUG 34 35#define ERR_DATA_BUFFER_SIZE 3 // Three 8-byte; 36 37#define define_one_ro(name) \ 38static SYSDEV_ATTR(name, 0444, show_##name, NULL) 39 40#define define_one_rw(name) \ 41static SYSDEV_ATTR(name, 0644, show_##name, store_##name) 42 43static u64 call_start[NR_CPUS]; 44static u64 phys_addr[NR_CPUS]; 45static u64 err_type_info[NR_CPUS]; 46static u64 err_struct_info[NR_CPUS]; 47static struct { 48 u64 data1; 49 u64 data2; 50 u64 data3; 51} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS]; 52static s64 status[NR_CPUS]; 53static u64 capabilities[NR_CPUS]; 54static u64 resources[NR_CPUS]; 55 56#define show(name) \ 57static ssize_t \ 58show_##name(struct sys_device *dev, struct sysdev_attribute *attr, \ 59 char *buf) \ 60{ \ 61 u32 cpu=dev->id; \ 62 return sprintf(buf, "%lx\n", name[cpu]); \ 63} 64 65#define store(name) \ 66static ssize_t \ 67store_##name(struct sys_device *dev, struct sysdev_attribute *attr, \ 68 const char *buf, size_t size) \ 69{ \ 70 unsigned int cpu=dev->id; \ 71 name[cpu] = simple_strtoull(buf, NULL, 16); \ 72 return size; \ 73} 74 75show(call_start) 76 77/* It's user's responsibility to call the PAL procedure on a specific 78 * processor. The cpu number in driver is only used for storing data. 79 */ 80static ssize_t 81store_call_start(struct sys_device *dev, struct sysdev_attribute *attr, 82 const char *buf, size_t size) 83{ 84 unsigned int cpu=dev->id; 85 unsigned long call_start = simple_strtoull(buf, NULL, 16); 86 87#ifdef ERR_INJ_DEBUG 88 printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu); 89 printk(KERN_DEBUG "err_type_info=%lx,\n", err_type_info[cpu]); 90 printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]); 91 printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\n", 92 err_data_buffer[cpu].data1, 93 err_data_buffer[cpu].data2, 94 err_data_buffer[cpu].data3); 95#endif 96 switch (call_start) { 97 case 0: /* Do nothing. */ 98 break; 99 case 1: /* Call pal_mc_error_inject in physical mode. */ 100 status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu], 101 err_struct_info[cpu], 102 ia64_tpa(&err_data_buffer[cpu]), 103 &capabilities[cpu], 104 &resources[cpu]); 105 break; 106 case 2: /* Call pal_mc_error_inject in virtual mode. */ 107 status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu], 108 err_struct_info[cpu], 109 ia64_tpa(&err_data_buffer[cpu]), 110 &capabilities[cpu], 111 &resources[cpu]); 112 break; 113 default: 114 status[cpu] = -EINVAL; 115 break; 116 } 117 118#ifdef ERR_INJ_DEBUG 119 printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]); 120 printk(KERN_DEBUG "capapbilities=%lx,\n", capabilities[cpu]); 121 printk(KERN_DEBUG "resources=%lx\n", resources[cpu]); 122#endif 123 return size; 124} 125 126show(err_type_info) 127store(err_type_info) 128 129static ssize_t 130show_virtual_to_phys(struct sys_device *dev, struct sysdev_attribute *attr, 131 char *buf) 132{ 133 unsigned int cpu=dev->id; 134 return sprintf(buf, "%lx\n", phys_addr[cpu]); 135} 136 137static ssize_t 138store_virtual_to_phys(struct sys_device *dev, struct sysdev_attribute *attr, 139 const char *buf, size_t size) 140{ 141 unsigned int cpu=dev->id; 142 u64 virt_addr=simple_strtoull(buf, NULL, 16); 143 int ret; 144 145 ret = get_user_pages(current, current->mm, virt_addr, 146 1, VM_READ, 0, NULL, NULL); 147 if (ret<=0) { 148#ifdef ERR_INJ_DEBUG 149 printk("Virtual address %lx is not existing.\n",virt_addr); 150#endif 151 return -EINVAL; 152 } 153 154 phys_addr[cpu] = ia64_tpa(virt_addr); 155 return size; 156} 157 158show(err_struct_info) 159store(err_struct_info) 160 161static ssize_t 162show_err_data_buffer(struct sys_device *dev, 163 struct sysdev_attribute *attr, char *buf) 164{ 165 unsigned int cpu=dev->id; 166 167 return sprintf(buf, "%lx, %lx, %lx\n", 168 err_data_buffer[cpu].data1, 169 err_data_buffer[cpu].data2, 170 err_data_buffer[cpu].data3); 171} 172 173static ssize_t 174store_err_data_buffer(struct sys_device *dev, 175 struct sysdev_attribute *attr, 176 const char *buf, size_t size) 177{ 178 unsigned int cpu=dev->id; 179 int ret; 180 181#ifdef ERR_INJ_DEBUG 182 printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n", 183 err_data_buffer[cpu].data1, 184 err_data_buffer[cpu].data2, 185 err_data_buffer[cpu].data3, 186 cpu); 187#endif 188 ret=sscanf(buf, "%lx, %lx, %lx", 189 &err_data_buffer[cpu].data1, 190 &err_data_buffer[cpu].data2, 191 &err_data_buffer[cpu].data3); 192 if (ret!=ERR_DATA_BUFFER_SIZE) 193 return -EINVAL; 194 195 return size; 196} 197 198show(status) 199show(capabilities) 200show(resources) 201 202define_one_rw(call_start); 203define_one_rw(err_type_info); 204define_one_rw(err_struct_info); 205define_one_rw(err_data_buffer); 206define_one_rw(virtual_to_phys); 207define_one_ro(status); 208define_one_ro(capabilities); 209define_one_ro(resources); 210 211static struct attribute *default_attrs[] = { 212 &attr_call_start.attr, 213 &attr_virtual_to_phys.attr, 214 &attr_err_type_info.attr, 215 &attr_err_struct_info.attr, 216 &attr_err_data_buffer.attr, 217 &attr_status.attr, 218 &attr_capabilities.attr, 219 &attr_resources.attr, 220 NULL 221}; 222 223static struct attribute_group err_inject_attr_group = { 224 .attrs = default_attrs, 225 .name = "err_inject" 226}; 227/* Add/Remove err_inject interface for CPU device */ 228static int __cpuinit err_inject_add_dev(struct sys_device * sys_dev) 229{ 230 return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group); 231} 232 233static int __cpuinit err_inject_remove_dev(struct sys_device * sys_dev) 234{ 235 sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); 236 return 0; 237} 238static int __cpuinit err_inject_cpu_callback(struct notifier_block *nfb, 239 unsigned long action, void *hcpu) 240{ 241 unsigned int cpu = (unsigned long)hcpu; 242 struct sys_device *sys_dev; 243 244 sys_dev = get_cpu_sysdev(cpu); 245 switch (action) { 246 case CPU_ONLINE: 247 case CPU_ONLINE_FROZEN: 248 err_inject_add_dev(sys_dev); 249 break; 250 case CPU_DEAD: 251 case CPU_DEAD_FROZEN: 252 err_inject_remove_dev(sys_dev); 253 break; 254 } 255 256 return NOTIFY_OK; 257} 258 259static struct notifier_block __cpuinitdata err_inject_cpu_notifier = 260{ 261 .notifier_call = err_inject_cpu_callback, 262}; 263 264static int __init 265err_inject_init(void) 266{ 267 int i; 268 269#ifdef ERR_INJ_DEBUG 270 printk(KERN_INFO "Enter error injection driver.\n"); 271#endif 272 for_each_online_cpu(i) { 273 err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE, 274 (void *)(long)i); 275 } 276 277 register_hotcpu_notifier(&err_inject_cpu_notifier); 278 279 return 0; 280} 281 282static void __exit 283err_inject_exit(void) 284{ 285 int i; 286 struct sys_device *sys_dev; 287 288#ifdef ERR_INJ_DEBUG 289 printk(KERN_INFO "Exit error injection driver.\n"); 290#endif 291 for_each_online_cpu(i) { 292 sys_dev = get_cpu_sysdev(i); 293 sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); 294 } 295 unregister_hotcpu_notifier(&err_inject_cpu_notifier); 296} 297 298module_init(err_inject_init); 299module_exit(err_inject_exit); 300 301MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); 302MODULE_DESCRIPTION("MC error injection kernel sysfs interface"); 303MODULE_LICENSE("GPL"); 304