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-rw-r--r--arch/ia64/kernel/err_inject.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c
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index 000000000000..d3e9f33e8bdd
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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) \
38static SYSDEV_ATTR(name, 0444, show_##name, NULL)
39
40#define define_one_rw(name) \
41static SYSDEV_ATTR(name, 0644, show_##name, store_##name)
42
43static u64 call_start[NR_CPUS];
44static u64 phys_addr[NR_CPUS];
45static u64 err_type_info[NR_CPUS];
46static u64 err_struct_info[NR_CPUS];
47static struct {
48 u64 data1;
49 u64 data2;
50 u64 data3;
51} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS];
52static s64 status[NR_CPUS];
53static u64 capabilities[NR_CPUS];
54static u64 resources[NR_CPUS];
55
56#define show(name) \
57static ssize_t \
58show_##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) \
65static ssize_t \
66store_##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
73show(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 */
78static ssize_t
79store_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
123show(err_type_info)
124store(err_type_info)
125
126static ssize_t
127show_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
133static ssize_t
134store_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
153show(err_struct_info)
154store(err_struct_info)
155
156static ssize_t
157show_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
167static ssize_t
168store_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
190show(status)
191show(capabilities)
192show(resources)
193
194define_one_rw(call_start);
195define_one_rw(err_type_info);
196define_one_rw(err_struct_info);
197define_one_rw(err_data_buffer);
198define_one_rw(virtual_to_phys);
199define_one_ro(status);
200define_one_ro(capabilities);
201define_one_ro(resources);
202
203static 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
215static 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 */
220static 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
225static 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}
230static 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
249static struct notifier_block __cpuinitdata err_inject_cpu_notifier =
250{
251 .notifier_call = err_inject_cpu_callback,
252};
253
254static int __init
255err_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
272static void __exit
273err_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
288module_init(err_inject_init);
289module_exit(err_inject_exit);
290
291MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
292MODULE_DESCRIPTION("MC error injection kenrel sysfs interface");
293MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-12 06:36:34 -0500