Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus
[linux-2.6] / arch / ia64 / kernel / err_inject.c
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");