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/device.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 DEVICE_ATTR(name, 0444, show_##name, NULL) 39 40 #define define_one_rw(name) \ 41 static DEVICE_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 device *dev, struct device_attribute *attr, \ 59 char *buf) \ 60 { \ 61 u32 cpu=dev->id; \ 62 return sprintf(buf, "%llx\n", name[cpu]); \ 63 } 64 65 #define store(name) \ 66 static ssize_t \ 67 store_##name(struct device *dev, struct device_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 75 show(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 */ 80 static ssize_t 81 store_call_start(struct device *dev, struct device_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=%llx,\n", err_type_info[cpu]); 90 printk(KERN_DEBUG "err_struct_info=%llx,\n", err_struct_info[cpu]); 91 printk(KERN_DEBUG "err_data_buffer=%llx, %llx, %llx.\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 "capabilities=%llx,\n", capabilities[cpu]); 121 printk(KERN_DEBUG "resources=%llx\n", resources[cpu]); 122 #endif 123 return size; 124 } 125 126 show(err_type_info) 127 store(err_type_info) 128 129 static ssize_t 130 show_virtual_to_phys(struct device *dev, struct device_attribute *attr, 131 char *buf) 132 { 133 unsigned int cpu=dev->id; 134 return sprintf(buf, "%llx\n", phys_addr[cpu]); 135 } 136 137 static ssize_t 138 store_virtual_to_phys(struct device *dev, struct device_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_fast(virt_addr, 1, FOLL_WRITE, NULL); 146 if (ret<=0) { 147 #ifdef ERR_INJ_DEBUG 148 printk("Virtual address %llx is not existing.\n", virt_addr); 149 #endif 150 return -EINVAL; 151 } 152 153 phys_addr[cpu] = ia64_tpa(virt_addr); 154 return size; 155 } 156 157 show(err_struct_info) 158 store(err_struct_info) 159 160 static ssize_t 161 show_err_data_buffer(struct device *dev, 162 struct device_attribute *attr, char *buf) 163 { 164 unsigned int cpu=dev->id; 165 166 return sprintf(buf, "%llx, %llx, %llx\n", 167 err_data_buffer[cpu].data1, 168 err_data_buffer[cpu].data2, 169 err_data_buffer[cpu].data3); 170 } 171 172 static ssize_t 173 store_err_data_buffer(struct device *dev, 174 struct device_attribute *attr, 175 const char *buf, size_t size) 176 { 177 unsigned int cpu=dev->id; 178 int ret; 179 180 #ifdef ERR_INJ_DEBUG 181 printk("write err_data_buffer=[%llx,%llx,%llx] on cpu%d\n", 182 err_data_buffer[cpu].data1, 183 err_data_buffer[cpu].data2, 184 err_data_buffer[cpu].data3, 185 cpu); 186 #endif 187 ret = sscanf(buf, "%llx, %llx, %llx", 188 &err_data_buffer[cpu].data1, 189 &err_data_buffer[cpu].data2, 190 &err_data_buffer[cpu].data3); 191 if (ret!=ERR_DATA_BUFFER_SIZE) 192 return -EINVAL; 193 194 return size; 195 } 196 197 show(status) 198 show(capabilities) 199 show(resources) 200 201 define_one_rw(call_start); 202 define_one_rw(err_type_info); 203 define_one_rw(err_struct_info); 204 define_one_rw(err_data_buffer); 205 define_one_rw(virtual_to_phys); 206 define_one_ro(status); 207 define_one_ro(capabilities); 208 define_one_ro(resources); 209 210 static struct attribute *default_attrs[] = { 211 &dev_attr_call_start.attr, 212 &dev_attr_virtual_to_phys.attr, 213 &dev_attr_err_type_info.attr, 214 &dev_attr_err_struct_info.attr, 215 &dev_attr_err_data_buffer.attr, 216 &dev_attr_status.attr, 217 &dev_attr_capabilities.attr, 218 &dev_attr_resources.attr, 219 NULL 220 }; 221 222 static struct attribute_group err_inject_attr_group = { 223 .attrs = default_attrs, 224 .name = "err_inject" 225 }; 226 /* Add/Remove err_inject interface for CPU device */ 227 static int err_inject_add_dev(unsigned int cpu) 228 { 229 struct device *sys_dev = get_cpu_device(cpu); 230 231 return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group); 232 } 233 234 static int err_inject_remove_dev(unsigned int cpu) 235 { 236 struct device *sys_dev = get_cpu_device(cpu); 237 238 sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); 239 return 0; 240 } 241 242 static enum cpuhp_state hp_online; 243 244 static int __init err_inject_init(void) 245 { 246 int ret; 247 #ifdef ERR_INJ_DEBUG 248 printk(KERN_INFO "Enter error injection driver.\n"); 249 #endif 250 251 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/err_inj:online", 252 err_inject_add_dev, err_inject_remove_dev); 253 if (ret >= 0) { 254 hp_online = ret; 255 ret = 0; 256 } 257 return ret; 258 } 259 260 static void __exit err_inject_exit(void) 261 { 262 #ifdef ERR_INJ_DEBUG 263 printk(KERN_INFO "Exit error injection driver.\n"); 264 #endif 265 cpuhp_remove_state(hp_online); 266 } 267 268 module_init(err_inject_init); 269 module_exit(err_inject_exit); 270 271 MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); 272 MODULE_DESCRIPTION("MC error injection kernel sysfs interface"); 273 MODULE_LICENSE("GPL"); 274