diff options
author | Fenghua Yu <fenghua.yu@intel.com> | 2006-12-08 19:15:16 -0500 |
---|---|---|
committer | Tony Luck <tony.luck@intel.com> | 2007-01-29 18:26:40 -0500 |
commit | 62fa562af36d32431ac8d7432b2c3ffbb7cf82df (patch) | |
tree | f3dac2cec638bc77a31fd130b1fc82472b5ab1b3 /arch/ia64/kernel/err_inject.c | |
parent | bf6285278418f1dc6f07296bbb286da0bfe26d5d (diff) |
[IA64] Itanium MC Error Injection Tool: Driver sysfs interface
This kernel driver patch provides sysfs interface for user application to
call pal_mc_error_inject() procedure.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/err_inject.c')
-rw-r--r-- | arch/ia64/kernel/err_inject.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c new file mode 100644 index 000000000000..d3e9f33e8bdd --- /dev/null +++ b/arch/ia64/kernel/err_inject.c | |||
@@ -0,0 +1,293 @@ | |||
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 | err_inject_add_dev(sys_dev); | ||
240 | break; | ||
241 | case CPU_DEAD: | ||
242 | err_inject_remove_dev(sys_dev); | ||
243 | break; | ||
244 | } | ||
245 | |||
246 | return NOTIFY_OK; | ||
247 | } | ||
248 | |||
249 | static struct notifier_block __cpuinitdata err_inject_cpu_notifier = | ||
250 | { | ||
251 | .notifier_call = err_inject_cpu_callback, | ||
252 | }; | ||
253 | |||
254 | static int __init | ||
255 | err_inject_init(void) | ||
256 | { | ||
257 | int i; | ||
258 | |||
259 | #ifdef ERR_INJ_DEBUG | ||
260 | printk(KERN_INFO "Enter error injection driver.\n"); | ||
261 | #endif | ||
262 | for_each_online_cpu(i) { | ||
263 | err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE, | ||
264 | (void *)(long)i); | ||
265 | } | ||
266 | |||
267 | register_hotcpu_notifier(&err_inject_cpu_notifier); | ||
268 | |||
269 | return 0; | ||
270 | } | ||
271 | |||
272 | static void __exit | ||
273 | err_inject_exit(void) | ||
274 | { | ||
275 | int i; | ||
276 | struct sys_device *sys_dev; | ||
277 | |||
278 | #ifdef ERR_INJ_DEBUG | ||
279 | printk(KERN_INFO "Exit error injection driver.\n"); | ||
280 | #endif | ||
281 | for_each_online_cpu(i) { | ||
282 | sys_dev = get_cpu_sysdev(i); | ||
283 | sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group); | ||
284 | } | ||
285 | unregister_hotcpu_notifier(&err_inject_cpu_notifier); | ||
286 | } | ||
287 | |||
288 | module_init(err_inject_init); | ||
289 | module_exit(err_inject_exit); | ||
290 | |||
291 | MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); | ||
292 | MODULE_DESCRIPTION("MC error injection kenrel sysfs interface"); | ||
293 | MODULE_LICENSE("GPL"); | ||