Commit | Line | Data |
---|---|---|
62fa562a FY |
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 | */ | |
8a25a2fd | 27 | #include <linux/device.h> |
62fa562a FY |
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) \ | |
8a25a2fd | 38 | static DEVICE_ATTR(name, 0444, show_##name, NULL) |
62fa562a FY |
39 | |
40 | #define define_one_rw(name) \ | |
8a25a2fd | 41 | static DEVICE_ATTR(name, 0644, show_##name, store_##name) |
62fa562a FY |
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 \ | |
8a25a2fd | 58 | show_##name(struct device *dev, struct device_attribute *attr, \ |
4a0b2b4d | 59 | char *buf) \ |
62fa562a FY |
60 | { \ |
61 | u32 cpu=dev->id; \ | |
62 | return sprintf(buf, "%lx\n", name[cpu]); \ | |
63 | } | |
64 | ||
65 | #define store(name) \ | |
66 | static ssize_t \ | |
8a25a2fd | 67 | store_##name(struct device *dev, struct device_attribute *attr, \ |
4a0b2b4d | 68 | const char *buf, size_t size) \ |
62fa562a FY |
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 | |
8a25a2fd | 81 | store_call_start(struct device *dev, struct device_attribute *attr, |
4a0b2b4d | 82 | const char *buf, size_t size) |
62fa562a FY |
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 | ||
126 | show(err_type_info) | |
127 | store(err_type_info) | |
128 | ||
129 | static ssize_t | |
8a25a2fd | 130 | show_virtual_to_phys(struct device *dev, struct device_attribute *attr, |
4a0b2b4d | 131 | char *buf) |
62fa562a FY |
132 | { |
133 | unsigned int cpu=dev->id; | |
134 | return sprintf(buf, "%lx\n", phys_addr[cpu]); | |
135 | } | |
136 | ||
137 | static ssize_t | |
8a25a2fd | 138 | store_virtual_to_phys(struct device *dev, struct device_attribute *attr, |
4a0b2b4d | 139 | const char *buf, size_t size) |
62fa562a FY |
140 | { |
141 | unsigned int cpu=dev->id; | |
142 | u64 virt_addr=simple_strtoull(buf, NULL, 16); | |
143 | int ret; | |
144 | ||
d4edcf0d | 145 | ret = get_user_pages(virt_addr, 1, VM_READ, 0, NULL, NULL); |
62fa562a FY |
146 | if (ret<=0) { |
147 | #ifdef ERR_INJ_DEBUG | |
148 | printk("Virtual address %lx 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 | |
8a25a2fd KS |
161 | show_err_data_buffer(struct device *dev, |
162 | struct device_attribute *attr, char *buf) | |
62fa562a FY |
163 | { |
164 | unsigned int cpu=dev->id; | |
165 | ||
166 | return sprintf(buf, "%lx, %lx, %lx\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 | |
8a25a2fd KS |
173 | store_err_data_buffer(struct device *dev, |
174 | struct device_attribute *attr, | |
4a0b2b4d | 175 | const char *buf, size_t size) |
62fa562a FY |
176 | { |
177 | unsigned int cpu=dev->id; | |
178 | int ret; | |
179 | ||
180 | #ifdef ERR_INJ_DEBUG | |
181 | printk("write err_data_buffer=[%lx,%lx,%lx] 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, "%lx, %lx, %lx", | |
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[] = { | |
8a25a2fd KS |
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, | |
62fa562a FY |
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 */ | |
ccce9bb8 | 227 | static int err_inject_add_dev(struct device *sys_dev) |
62fa562a FY |
228 | { |
229 | return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group); | |
230 | } | |
231 | ||
ccce9bb8 | 232 | static int err_inject_remove_dev(struct device *sys_dev) |
62fa562a FY |
233 | { |
234 | sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); | |
235 | return 0; | |
236 | } | |
ccce9bb8 | 237 | static int err_inject_cpu_callback(struct notifier_block *nfb, |
62fa562a FY |
238 | unsigned long action, void *hcpu) |
239 | { | |
240 | unsigned int cpu = (unsigned long)hcpu; | |
8a25a2fd | 241 | struct device *sys_dev; |
62fa562a | 242 | |
8a25a2fd | 243 | sys_dev = get_cpu_device(cpu); |
62fa562a FY |
244 | switch (action) { |
245 | case CPU_ONLINE: | |
8bb78442 | 246 | case CPU_ONLINE_FROZEN: |
62fa562a FY |
247 | err_inject_add_dev(sys_dev); |
248 | break; | |
249 | case CPU_DEAD: | |
8bb78442 | 250 | case CPU_DEAD_FROZEN: |
62fa562a FY |
251 | err_inject_remove_dev(sys_dev); |
252 | break; | |
253 | } | |
254 | ||
255 | return NOTIFY_OK; | |
256 | } | |
257 | ||
ccce9bb8 | 258 | static struct notifier_block err_inject_cpu_notifier = |
62fa562a FY |
259 | { |
260 | .notifier_call = err_inject_cpu_callback, | |
261 | }; | |
262 | ||
263 | static int __init | |
264 | err_inject_init(void) | |
265 | { | |
266 | int i; | |
267 | ||
268 | #ifdef ERR_INJ_DEBUG | |
269 | printk(KERN_INFO "Enter error injection driver.\n"); | |
270 | #endif | |
f2e48a89 SB |
271 | |
272 | cpu_notifier_register_begin(); | |
273 | ||
62fa562a FY |
274 | for_each_online_cpu(i) { |
275 | err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE, | |
276 | (void *)(long)i); | |
277 | } | |
278 | ||
f2e48a89 SB |
279 | __register_hotcpu_notifier(&err_inject_cpu_notifier); |
280 | ||
281 | cpu_notifier_register_done(); | |
62fa562a FY |
282 | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static void __exit | |
287 | err_inject_exit(void) | |
288 | { | |
289 | int i; | |
8a25a2fd | 290 | struct device *sys_dev; |
62fa562a FY |
291 | |
292 | #ifdef ERR_INJ_DEBUG | |
293 | printk(KERN_INFO "Exit error injection driver.\n"); | |
294 | #endif | |
f2e48a89 SB |
295 | |
296 | cpu_notifier_register_begin(); | |
297 | ||
62fa562a | 298 | for_each_online_cpu(i) { |
8a25a2fd | 299 | sys_dev = get_cpu_device(i); |
62fa562a FY |
300 | sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); |
301 | } | |
f2e48a89 SB |
302 | |
303 | __unregister_hotcpu_notifier(&err_inject_cpu_notifier); | |
304 | ||
305 | cpu_notifier_register_done(); | |
62fa562a FY |
306 | } |
307 | ||
308 | module_init(err_inject_init); | |
309 | module_exit(err_inject_exit); | |
310 | ||
311 | MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); | |
8ee4dc39 | 312 | MODULE_DESCRIPTION("MC error injection kernel sysfs interface"); |
62fa562a | 313 | MODULE_LICENSE("GPL"); |