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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/device.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 DEVICE_ATTR(name, 0444, show_##name, NULL)
39
40#define define_one_rw(name) \
41static DEVICE_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 device *dev, struct device_attribute *attr, \
59 char *buf) \
60{ \
61 u32 cpu=dev->id; \
62 return sprintf(buf, "%llx\n", name[cpu]); \
63}
64
65#define store(name) \
66static ssize_t \
67store_##name(struct device *dev, struct device_attribute *attr, \
68 const char *buf, size_t size) \
69{ \
70 unsigned int cpu=dev->id; \
71 name[cpu] = simple_strtoull(buf, NULL, 16); \
72 return size; \
73}
74
75show(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 */
80static ssize_t
81store_call_start(struct device *dev, struct device_attribute *attr,
82 const char *buf, size_t size)
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=%llx,\n", err_type_info[cpu]);
90 printk(KERN_DEBUG "err_struct_info=%llx,\n", err_struct_info[cpu]);
91 printk(KERN_DEBUG "err_data_buffer=%llx, %llx, %llx.\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 "capabilities=%llx,\n", capabilities[cpu]);
121 printk(KERN_DEBUG "resources=%llx\n", resources[cpu]);
122#endif
123 return size;
124}
125
126show(err_type_info)
127store(err_type_info)
128
129static ssize_t
130show_virtual_to_phys(struct device *dev, struct device_attribute *attr,
131 char *buf)
132{
133 unsigned int cpu=dev->id;
134 return sprintf(buf, "%llx\n", phys_addr[cpu]);
135}
136
137static ssize_t
138store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
139 const char *buf, size_t size)
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_fast(virt_addr, 1, FOLL_WRITE, NULL);
146 if (ret<=0) {
147#ifdef ERR_INJ_DEBUG
148 printk("Virtual address %llx is not existing.\n", virt_addr);
149#endif
150 return -EINVAL;
151 }
152
153 phys_addr[cpu] = ia64_tpa(virt_addr);
154 return size;
155}
156
157show(err_struct_info)
158store(err_struct_info)
159
160static ssize_t
161show_err_data_buffer(struct device *dev,
162 struct device_attribute *attr, char *buf)
163{
164 unsigned int cpu=dev->id;
165
166 return sprintf(buf, "%llx, %llx, %llx\n",
167 err_data_buffer[cpu].data1,
168 err_data_buffer[cpu].data2,
169 err_data_buffer[cpu].data3);
170}
171
172static ssize_t
173store_err_data_buffer(struct device *dev,
174 struct device_attribute *attr,
175 const char *buf, size_t size)
176{
177 unsigned int cpu=dev->id;
178 int ret;
179
180#ifdef ERR_INJ_DEBUG
181 printk("write err_data_buffer=[%llx,%llx,%llx] on cpu%d\n",
182 err_data_buffer[cpu].data1,
183 err_data_buffer[cpu].data2,
184 err_data_buffer[cpu].data3,
185 cpu);
186#endif
187 ret = sscanf(buf, "%llx, %llx, %llx",
188 &err_data_buffer[cpu].data1,
189 &err_data_buffer[cpu].data2,
190 &err_data_buffer[cpu].data3);
191 if (ret!=ERR_DATA_BUFFER_SIZE)
192 return -EINVAL;
193
194 return size;
195}
196
197show(status)
198show(capabilities)
199show(resources)
200
201define_one_rw(call_start);
202define_one_rw(err_type_info);
203define_one_rw(err_struct_info);
204define_one_rw(err_data_buffer);
205define_one_rw(virtual_to_phys);
206define_one_ro(status);
207define_one_ro(capabilities);
208define_one_ro(resources);
209
210static struct attribute *default_attrs[] = {
211 &dev_attr_call_start.attr,
212 &dev_attr_virtual_to_phys.attr,
213 &dev_attr_err_type_info.attr,
214 &dev_attr_err_struct_info.attr,
215 &dev_attr_err_data_buffer.attr,
216 &dev_attr_status.attr,
217 &dev_attr_capabilities.attr,
218 &dev_attr_resources.attr,
219 NULL
220};
221
222static struct attribute_group err_inject_attr_group = {
223 .attrs = default_attrs,
224 .name = "err_inject"
225};
226/* Add/Remove err_inject interface for CPU device */
227static int err_inject_add_dev(unsigned int cpu)
228{
229 struct device *sys_dev = get_cpu_device(cpu);
230
231 return sysfs_create_group(&sys_dev->kobj, &err_inject_attr_group);
232}
233
234static int err_inject_remove_dev(unsigned int cpu)
235{
236 struct device *sys_dev = get_cpu_device(cpu);
237
238 sysfs_remove_group(&sys_dev->kobj, &err_inject_attr_group);
239 return 0;
240}
241
242static enum cpuhp_state hp_online;
243
244static int __init err_inject_init(void)
245{
246 int ret;
247#ifdef ERR_INJ_DEBUG
248 printk(KERN_INFO "Enter error injection driver.\n");
249#endif
250
251 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/err_inj:online",
252 err_inject_add_dev, err_inject_remove_dev);
253 if (ret >= 0) {
254 hp_online = ret;
255 ret = 0;
256 }
257 return ret;
258}
259
260static void __exit err_inject_exit(void)
261{
262#ifdef ERR_INJ_DEBUG
263 printk(KERN_INFO "Exit error injection driver.\n");
264#endif
265 cpuhp_remove_state(hp_online);
266}
267
268module_init(err_inject_init);
269module_exit(err_inject_exit);
270
271MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
272MODULE_DESCRIPTION("MC error injection kernel sysfs interface");
273MODULE_LICENSE("GPL");
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, struct sysdev_attribute *attr, \
59 char *buf) \
60{ \
61 u32 cpu=dev->id; \
62 return sprintf(buf, "%lx\n", name[cpu]); \
63}
64
65#define store(name) \
66static ssize_t \
67store_##name(struct sys_device *dev, struct sysdev_attribute *attr, \
68 const char *buf, size_t size) \
69{ \
70 unsigned int cpu=dev->id; \
71 name[cpu] = simple_strtoull(buf, NULL, 16); \
72 return size; \
73}
74
75show(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 */
80static ssize_t
81store_call_start(struct sys_device *dev, struct sysdev_attribute *attr,
82 const char *buf, size_t size)
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
126show(err_type_info)
127store(err_type_info)
128
129static ssize_t
130show_virtual_to_phys(struct sys_device *dev, struct sysdev_attribute *attr,
131 char *buf)
132{
133 unsigned int cpu=dev->id;
134 return sprintf(buf, "%lx\n", phys_addr[cpu]);
135}
136
137static ssize_t
138store_virtual_to_phys(struct sys_device *dev, struct sysdev_attribute *attr,
139 const char *buf, size_t size)
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
158show(err_struct_info)
159store(err_struct_info)
160
161static ssize_t
162show_err_data_buffer(struct sys_device *dev,
163 struct sysdev_attribute *attr, char *buf)
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
173static ssize_t
174store_err_data_buffer(struct sys_device *dev,
175 struct sysdev_attribute *attr,
176 const char *buf, size_t size)
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
198show(status)
199show(capabilities)
200show(resources)
201
202define_one_rw(call_start);
203define_one_rw(err_type_info);
204define_one_rw(err_struct_info);
205define_one_rw(err_data_buffer);
206define_one_rw(virtual_to_phys);
207define_one_ro(status);
208define_one_ro(capabilities);
209define_one_ro(resources);
210
211static 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
223static 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 */
228static 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
233static 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}
238static 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:
247 case CPU_ONLINE_FROZEN:
248 err_inject_add_dev(sys_dev);
249 break;
250 case CPU_DEAD:
251 case CPU_DEAD_FROZEN:
252 err_inject_remove_dev(sys_dev);
253 break;
254 }
255
256 return NOTIFY_OK;
257}
258
259static struct notifier_block __cpuinitdata err_inject_cpu_notifier =
260{
261 .notifier_call = err_inject_cpu_callback,
262};
263
264static int __init
265err_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
282static void __exit
283err_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
298module_init(err_inject_init);
299module_exit(err_inject_exit);
300
301MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
302MODULE_DESCRIPTION("MC error injection kernel sysfs interface");
303MODULE_LICENSE("GPL");