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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 | */ | |
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 \ | |
4a0b2b4d AK |
58 | show_##name(struct sys_device *dev, struct sysdev_attribute *attr, \ |
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 \ | |
4a0b2b4d AK |
67 | store_##name(struct sys_device *dev, struct sysdev_attribute *attr, \ |
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 | |
4a0b2b4d AK |
81 | store_call_start(struct sys_device *dev, struct sysdev_attribute *attr, |
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 | |
4a0b2b4d AK |
130 | show_virtual_to_phys(struct sys_device *dev, struct sysdev_attribute *attr, |
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 | |
4a0b2b4d AK |
138 | store_virtual_to_phys(struct sys_device *dev, struct sysdev_attribute *attr, |
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 | ||
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 | ||
158 | show(err_struct_info) | |
159 | store(err_struct_info) | |
160 | ||
161 | static ssize_t | |
4a0b2b4d AK |
162 | show_err_data_buffer(struct sys_device *dev, |
163 | struct sysdev_attribute *attr, char *buf) | |
62fa562a FY |
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 | ||
173 | static ssize_t | |
4a0b2b4d AK |
174 | store_err_data_buffer(struct sys_device *dev, |
175 | struct sysdev_attribute *attr, | |
176 | const char *buf, size_t size) | |
62fa562a FY |
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 | ||
198 | show(status) | |
199 | show(capabilities) | |
200 | show(resources) | |
201 | ||
202 | define_one_rw(call_start); | |
203 | define_one_rw(err_type_info); | |
204 | define_one_rw(err_struct_info); | |
205 | define_one_rw(err_data_buffer); | |
206 | define_one_rw(virtual_to_phys); | |
207 | define_one_ro(status); | |
208 | define_one_ro(capabilities); | |
209 | define_one_ro(resources); | |
210 | ||
211 | static 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 | ||
223 | static 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 */ | |
228 | static 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 | ||
233 | static 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 | } | |
238 | static 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: | |
8bb78442 | 247 | case CPU_ONLINE_FROZEN: |
62fa562a FY |
248 | err_inject_add_dev(sys_dev); |
249 | break; | |
250 | case CPU_DEAD: | |
8bb78442 | 251 | case CPU_DEAD_FROZEN: |
62fa562a FY |
252 | err_inject_remove_dev(sys_dev); |
253 | break; | |
254 | } | |
255 | ||
256 | return NOTIFY_OK; | |
257 | } | |
258 | ||
259 | static struct notifier_block __cpuinitdata err_inject_cpu_notifier = | |
260 | { | |
261 | .notifier_call = err_inject_cpu_callback, | |
262 | }; | |
263 | ||
264 | static int __init | |
265 | err_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 | ||
282 | static void __exit | |
283 | err_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 | ||
298 | module_init(err_inject_init); | |
299 | module_exit(err_inject_exit); | |
300 | ||
301 | MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); | |
8ee4dc39 | 302 | MODULE_DESCRIPTION("MC error injection kernel sysfs interface"); |
62fa562a | 303 | MODULE_LICENSE("GPL"); |