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) \ 38 static SYSDEV_ATTR(name, 0444, show_##name, NULL) 39 40 #define define_one_rw(name) \ 41 static SYSDEV_ATTR(name, 0644, show_##name, store_##name) 42 43 static u64 call_start[NR_CPUS]; 44 static u64 phys_addr[NR_CPUS]; 45 static u64 err_type_info[NR_CPUS]; 46 static u64 err_struct_info[NR_CPUS]; 47 static struct { 48 u64 data1; 49 u64 data2; 50 u64 data3; 51 } __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS]; 52 static s64 status[NR_CPUS]; 53 static u64 capabilities[NR_CPUS]; 54 static u64 resources[NR_CPUS]; 55 56 #define show(name) \ 57 static ssize_t \ 58 show_##name(struct sys_device *dev, char *buf) \ 59 { \ 60 u32 cpu=dev->id; \ 61 return sprintf(buf, "%lx\n", name[cpu]); \ 62 } 63 64 #define store(name) \ 65 static ssize_t \ 66 store_##name(struct sys_device *dev, const char *buf, size_t size) \ 67 { \ 68 unsigned int cpu=dev->id; \ 69 name[cpu] = simple_strtoull(buf, NULL, 16); \ 70 return size; \ 71 } 72 73 show(call_start) 74 75 /* It's user's responsibility to call the PAL procedure on a specific 76 * processor. The cpu number in driver is only used for storing data. 77 */ 78 static ssize_t 79 store_call_start(struct sys_device *dev, const char *buf, size_t size) 80 { 81 unsigned int cpu=dev->id; 82 unsigned long call_start = simple_strtoull(buf, NULL, 16); 83 84 #ifdef ERR_INJ_DEBUG 85 printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu); 86 printk(KERN_DEBUG "err_type_info=%lx,\n", err_type_info[cpu]); 87 printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]); 88 printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\n", 89 err_data_buffer[cpu].data1, 90 err_data_buffer[cpu].data2, 91 err_data_buffer[cpu].data3); 92 #endif 93 switch (call_start) { 94 case 0: /* Do nothing. */ 95 break; 96 case 1: /* Call pal_mc_error_inject in physical mode. */ 97 status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu], 98 err_struct_info[cpu], 99 ia64_tpa(&err_data_buffer[cpu]), 100 &capabilities[cpu], 101 &resources[cpu]); 102 break; 103 case 2: /* Call pal_mc_error_inject in virtual mode. */ 104 status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu], 105 err_struct_info[cpu], 106 ia64_tpa(&err_data_buffer[cpu]), 107 &capabilities[cpu], 108 &resources[cpu]); 109 break; 110 default: 111 status[cpu] = -EINVAL; 112 break; 113 } 114 115 #ifdef ERR_INJ_DEBUG 116 printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]); 117 printk(KERN_DEBUG "capapbilities=%lx,\n", capabilities[cpu]); 118 printk(KERN_DEBUG "resources=%lx\n", resources[cpu]); 119 #endif 120 return size; 121 } 122 123 show(err_type_info) 124 store(err_type_info) 125 126 static ssize_t 127 show_virtual_to_phys(struct sys_device *dev, char *buf) 128 { 129 unsigned int cpu=dev->id; 130 return sprintf(buf, "%lx\n", phys_addr[cpu]); 131 } 132 133 static ssize_t 134 store_virtual_to_phys(struct sys_device *dev, const char *buf, size_t size) 135 { 136 unsigned int cpu=dev->id; 137 u64 virt_addr=simple_strtoull(buf, NULL, 16); 138 int ret; 139 140 ret = get_user_pages(current, current->mm, virt_addr, 141 1, VM_READ, 0, NULL, NULL); 142 if (ret<=0) { 143 #ifdef ERR_INJ_DEBUG 144 printk("Virtual address %lx is not existing.\n",virt_addr); 145 #endif 146 return -EINVAL; 147 } 148 149 phys_addr[cpu] = ia64_tpa(virt_addr); 150 return size; 151 } 152 153 show(err_struct_info) 154 store(err_struct_info) 155 156 static ssize_t 157 show_err_data_buffer(struct sys_device *dev, char *buf) 158 { 159 unsigned int cpu=dev->id; 160 161 return sprintf(buf, "%lx, %lx, %lx\n", 162 err_data_buffer[cpu].data1, 163 err_data_buffer[cpu].data2, 164 err_data_buffer[cpu].data3); 165 } 166 167 static ssize_t 168 store_err_data_buffer(struct sys_device *dev, const char *buf, size_t size) 169 { 170 unsigned int cpu=dev->id; 171 int ret; 172 173 #ifdef ERR_INJ_DEBUG 174 printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n", 175 err_data_buffer[cpu].data1, 176 err_data_buffer[cpu].data2, 177 err_data_buffer[cpu].data3, 178 cpu); 179 #endif 180 ret=sscanf(buf, "%lx, %lx, %lx", 181 &err_data_buffer[cpu].data1, 182 &err_data_buffer[cpu].data2, 183 &err_data_buffer[cpu].data3); 184 if (ret!=ERR_DATA_BUFFER_SIZE) 185 return -EINVAL; 186 187 return size; 188 } 189 190 show(status) 191 show(capabilities) 192 show(resources) 193 194 define_one_rw(call_start); 195 define_one_rw(err_type_info); 196 define_one_rw(err_struct_info); 197 define_one_rw(err_data_buffer); 198 define_one_rw(virtual_to_phys); 199 define_one_ro(status); 200 define_one_ro(capabilities); 201 define_one_ro(resources); 202 203 static struct attribute *default_attrs[] = { 204 &attr_call_start.attr, 205 &attr_virtual_to_phys.attr, 206 &attr_err_type_info.attr, 207 &attr_err_struct_info.attr, 208 &attr_err_data_buffer.attr, 209 &attr_status.attr, 210 &attr_capabilities.attr, 211 &attr_resources.attr, 212 NULL 213 }; 214 215 static struct attribute_group err_inject_attr_group = { 216 .attrs = default_attrs, 217 .name = "err_inject" 218 }; 219 /* Add/Remove err_inject interface for CPU device */ 220 static int __cpuinit err_inject_add_dev(struct sys_device * sys_dev) 221 { 222 return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group); 223 } 224 225 static int __cpuinit err_inject_remove_dev(struct sys_device * sys_dev) 226 { 227 sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); 228 return 0; 229 } 230 static int __cpuinit err_inject_cpu_callback(struct notifier_block *nfb, 231 unsigned long action, void *hcpu) 232 { 233 unsigned int cpu = (unsigned long)hcpu; 234 struct sys_device *sys_dev; 235 236 sys_dev = get_cpu_sysdev(cpu); 237 switch (action) { 238 case CPU_ONLINE: 239 case CPU_ONLINE_FROZEN: 240 err_inject_add_dev(sys_dev); 241 break; 242 case CPU_DEAD: 243 case CPU_DEAD_FROZEN: 244 err_inject_remove_dev(sys_dev); 245 break; 246 } 247 248 return NOTIFY_OK; 249 } 250 251 static struct notifier_block __cpuinitdata err_inject_cpu_notifier = 252 { 253 .notifier_call = err_inject_cpu_callback, 254 }; 255 256 static int __init 257 err_inject_init(void) 258 { 259 int i; 260 261 #ifdef ERR_INJ_DEBUG 262 printk(KERN_INFO "Enter error injection driver.\n"); 263 #endif 264 for_each_online_cpu(i) { 265 err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE, 266 (void *)(long)i); 267 } 268 269 register_hotcpu_notifier(&err_inject_cpu_notifier); 270 271 return 0; 272 } 273 274 static void __exit 275 err_inject_exit(void) 276 { 277 int i; 278 struct sys_device *sys_dev; 279 280 #ifdef ERR_INJ_DEBUG 281 printk(KERN_INFO "Exit error injection driver.\n"); 282 #endif 283 for_each_online_cpu(i) { 284 sys_dev = get_cpu_sysdev(i); 285 sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); 286 } 287 unregister_hotcpu_notifier(&err_inject_cpu_notifier); 288 } 289 290 module_init(err_inject_init); 291 module_exit(err_inject_exit); 292 293 MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); 294 MODULE_DESCRIPTION("MC error injection kernel sysfs interface"); 295 MODULE_LICENSE("GPL"); 296