summaryrefslogtreecommitdiffstats
path: root/arch/ia64/kernel/err_inject.c
blob: 6a49600cf337f5e468e857ccce5088f12917bfe8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
/*
 * err_inject.c -
 *	1.) Inject errors to a processor.
 *	2.) Query error injection capabilities.
 * This driver along with user space code can be acting as an error
 * injection tool.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation
 * Copyright (C) 2006, Intel Corp.  All rights reserved.
 *
 */
#include <linux/sysdev.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/module.h>

#define ERR_INJ_DEBUG

#define ERR_DATA_BUFFER_SIZE 3 		// Three 8-byte;

#define define_one_ro(name) 						\
static SYSDEV_ATTR(name, 0444, show_##name, NULL)

#define define_one_rw(name) 						\
static SYSDEV_ATTR(name, 0644, show_##name, store_##name)

static u64 call_start[NR_CPUS];
static u64 phys_addr[NR_CPUS];
static u64 err_type_info[NR_CPUS];
static u64 err_struct_info[NR_CPUS];
static struct {
	u64 data1;
	u64 data2;
	u64 data3;
} __attribute__((__aligned__(16))) err_data_buffer[NR_CPUS];
static s64 status[NR_CPUS];
static u64 capabilities[NR_CPUS];
static u64 resources[NR_CPUS];

#define show(name) 							\
static ssize_t 								\
show_##name(struct sys_device *dev, char *buf)				\
{									\
	u32 cpu=dev->id;						\
	return sprintf(buf, "%lx\n", name[cpu]);			\
}

#define store(name)							\
static ssize_t 								\
store_##name(struct sys_device *dev, const char *buf, size_t size)	\
{									\
	unsigned int cpu=dev->id;					\
	name[cpu] = simple_strtoull(buf, NULL, 16);			\
	return size;							\
}

show(call_start)

/* It's user's responsibility to call the PAL procedure on a specific
 * processor. The cpu number in driver is only used for storing data.
 */
static ssize_t
store_call_start(struct sys_device *dev, const char *buf, size_t size)
{
	unsigned int cpu=dev->id;
	unsigned long call_start = simple_strtoull(buf, NULL, 16);

#ifdef ERR_INJ_DEBUG
	printk(KERN_DEBUG "pal_mc_err_inject for cpu%d:\n", cpu);
	printk(KERN_DEBUG "err_type_info=%lx,\n", err_type_info[cpu]);
	printk(KERN_DEBUG "err_struct_info=%lx,\n", err_struct_info[cpu]);
	printk(KERN_DEBUG "err_data_buffer=%lx, %lx, %lx.\n",
			  err_data_buffer[cpu].data1,
			  err_data_buffer[cpu].data2,
			  err_data_buffer[cpu].data3);
#endif
	switch (call_start) {
	    case 0: /* Do nothing. */
		break;
	    case 1: /* Call pal_mc_error_inject in physical mode. */
		status[cpu]=ia64_pal_mc_error_inject_phys(err_type_info[cpu],
					err_struct_info[cpu],
					ia64_tpa(&err_data_buffer[cpu]),
					&capabilities[cpu],
			 		&resources[cpu]);
		break;
	    case 2: /* Call pal_mc_error_inject in virtual mode. */
		status[cpu]=ia64_pal_mc_error_inject_virt(err_type_info[cpu],
					err_struct_info[cpu],
					ia64_tpa(&err_data_buffer[cpu]),
					&capabilities[cpu],
			 		&resources[cpu]);
		break;
	    default:
		status[cpu] = -EINVAL;
		break;
	}

#ifdef ERR_INJ_DEBUG
	printk(KERN_DEBUG "Returns: status=%d,\n", (int)status[cpu]);
	printk(KERN_DEBUG "capapbilities=%lx,\n", capabilities[cpu]);
	printk(KERN_DEBUG "resources=%lx\n", resources[cpu]);
#endif
	return size;
}

show(err_type_info)
store(err_type_info)

static ssize_t
show_virtual_to_phys(struct sys_device *dev, char *buf)
{
	unsigned int cpu=dev->id;
	return sprintf(buf, "%lx\n", phys_addr[cpu]);
}

static ssize_t
store_virtual_to_phys(struct sys_device *dev, const char *buf, size_t size)
{
	unsigned int cpu=dev->id;
	u64 virt_addr=simple_strtoull(buf, NULL, 16);
	int ret;

        ret = get_user_pages(current, current->mm, virt_addr,
                        1, VM_READ, 0, NULL, NULL);
	if (ret<=0) {
#ifdef ERR_INJ_DEBUG
		printk("Virtual address %lx is not existing.\n",virt_addr);
#endif
		return -EINVAL;
	}

	phys_addr[cpu] = ia64_tpa(virt_addr);
	return size;
}

show(err_struct_info)
store(err_struct_info)

static ssize_t
show_err_data_buffer(struct sys_device *dev, char *buf)
{
	unsigned int cpu=dev->id;

	return sprintf(buf, "%lx, %lx, %lx\n",
			err_data_buffer[cpu].data1,
			err_data_buffer[cpu].data2,
			err_data_buffer[cpu].data3);
}

static ssize_t
store_err_data_buffer(struct sys_device *dev, const char *buf, size_t size)
{
	unsigned int cpu=dev->id;
	int ret;

#ifdef ERR_INJ_DEBUG
	printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n",
		 err_data_buffer[cpu].data1,
		 err_data_buffer[cpu].data2,
		 err_data_buffer[cpu].data3,
		 cpu);
#endif
	ret=sscanf(buf, "%lx, %lx, %lx",
			&err_data_buffer[cpu].data1,
			&err_data_buffer[cpu].data2,
			&err_data_buffer[cpu].data3);
	if (ret!=ERR_DATA_BUFFER_SIZE)
		return -EINVAL;

	return size;
}

show(status)
show(capabilities)
show(resources)

define_one_rw(call_start);
define_one_rw(err_type_info);
define_one_rw(err_struct_info);
define_one_rw(err_data_buffer);
define_one_rw(virtual_to_phys);
define_one_ro(status);
define_one_ro(capabilities);
define_one_ro(resources);

static struct attribute *default_attrs[] = {
	&attr_call_start.attr,
	&attr_virtual_to_phys.attr,
	&attr_err_type_info.attr,
	&attr_err_struct_info.attr,
	&attr_err_data_buffer.attr,
	&attr_status.attr,
	&attr_capabilities.attr,
	&attr_resources.attr,
	NULL
};

static struct attribute_group err_inject_attr_group = {
	.attrs = default_attrs,
	.name = "err_inject"
};
/* Add/Remove err_inject interface for CPU device */
static int __cpuinit err_inject_add_dev(struct sys_device * sys_dev)
{
	return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
}

static int __cpuinit err_inject_remove_dev(struct sys_device * sys_dev)
{
	sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
	return 0;
}
static int __cpuinit err_inject_cpu_callback(struct notifier_block *nfb,
		unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;
	struct sys_device *sys_dev;

	sys_dev = get_cpu_sysdev(cpu);
	switch (action) {
	case CPU_ONLINE:
	case CPU_ONLINE_FROZEN:
		err_inject_add_dev(sys_dev);
		break;
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		err_inject_remove_dev(sys_dev);
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block __cpuinitdata err_inject_cpu_notifier =
{
	.notifier_call = err_inject_cpu_callback,
};

static int __init
err_inject_init(void)
{
	int i;

#ifdef ERR_INJ_DEBUG
	printk(KERN_INFO "Enter error injection driver.\n");
#endif
	for_each_online_cpu(i) {
		err_inject_cpu_callback(&err_inject_cpu_notifier, CPU_ONLINE,
				(void *)(long)i);
	}

	register_hotcpu_notifier(&err_inject_cpu_notifier);

	return 0;
}

static void __exit
err_inject_exit(void)
{
	int i;
	struct sys_device *sys_dev;

#ifdef ERR_INJ_DEBUG
	printk(KERN_INFO "Exit error injection driver.\n");
#endif
	for_each_online_cpu(i) {
		sys_dev = get_cpu_sysdev(i);
		sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
	}
	unregister_hotcpu_notifier(&err_inject_cpu_notifier);
}

module_init(err_inject_init);
module_exit(err_inject_exit);

MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
MODULE_DESCRIPTION("MC error injection kenrel sysfs interface");
MODULE_LICENSE("GPL");