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
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.
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
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.
23 * Written by: Fenghua Yu <fenghua.yu@intel.com>, Intel Corporation
24 * Copyright (C) 2006, Intel Corp. All rights reserved.
27 #include <linux/device.h>
28 #include <linux/init.h>
30 #include <linux/cpu.h>
31 #include <linux/module.h>
35 #define ERR_DATA_BUFFER_SIZE 3 // Three 8-byte;
37 #define define_one_ro(name) \
38 static DEVICE_ATTR(name, 0444, show_##name, NULL)
40 #define define_one_rw(name) \
41 static DEVICE_ATTR(name, 0644, show_##name, store_##name)
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
];
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
];
58 show_##name(struct device *dev, struct device_attribute *attr, \
62 return sprintf(buf, "%lx\n", name[cpu]); \
67 store_##name(struct device *dev, struct device_attribute *attr, \
68 const char *buf, size_t size) \
70 unsigned int cpu=dev->id; \
71 name[cpu] = simple_strtoull(buf, NULL, 16); \
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.
81 store_call_start(struct device
*dev
, struct device_attribute
*attr
,
82 const char *buf
, size_t size
)
84 unsigned int cpu
=dev
->id
;
85 unsigned long call_start
= simple_strtoull(buf
, NULL
, 16);
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
);
97 case 0: /* Do nothing. */
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
]),
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
]),
114 status
[cpu
] = -EINVAL
;
119 printk(KERN_DEBUG
"Returns: status=%d,\n", (int)status
[cpu
]);
120 printk(KERN_DEBUG
"capabilities=%lx,\n", capabilities
[cpu
]);
121 printk(KERN_DEBUG
"resources=%lx\n", resources
[cpu
]);
130 show_virtual_to_phys(struct device
*dev
, struct device_attribute
*attr
,
133 unsigned int cpu
=dev
->id
;
134 return sprintf(buf
, "%lx\n", phys_addr
[cpu
]);
138 store_virtual_to_phys(struct device
*dev
, struct device_attribute
*attr
,
139 const char *buf
, size_t size
)
141 unsigned int cpu
=dev
->id
;
142 u64 virt_addr
=simple_strtoull(buf
, NULL
, 16);
145 ret
= get_user_pages_fast(virt_addr
, 1, FOLL_WRITE
, NULL
);
148 printk("Virtual address %lx is not existing.\n",virt_addr
);
153 phys_addr
[cpu
] = ia64_tpa(virt_addr
);
157 show(err_struct_info
)
158 store(err_struct_info
)
161 show_err_data_buffer(struct device
*dev
,
162 struct device_attribute
*attr
, char *buf
)
164 unsigned int cpu
=dev
->id
;
166 return sprintf(buf
, "%lx, %lx, %lx\n",
167 err_data_buffer
[cpu
].data1
,
168 err_data_buffer
[cpu
].data2
,
169 err_data_buffer
[cpu
].data3
);
173 store_err_data_buffer(struct device
*dev
,
174 struct device_attribute
*attr
,
175 const char *buf
, size_t size
)
177 unsigned int cpu
=dev
->id
;
181 printk("write err_data_buffer=[%lx,%lx,%lx] on cpu%d\n",
182 err_data_buffer
[cpu
].data1
,
183 err_data_buffer
[cpu
].data2
,
184 err_data_buffer
[cpu
].data3
,
187 ret
=sscanf(buf
, "%lx, %lx, %lx",
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
)
201 define_one_rw(call_start
);
202 define_one_rw(err_type_info
);
203 define_one_rw(err_struct_info
);
204 define_one_rw(err_data_buffer
);
205 define_one_rw(virtual_to_phys
);
206 define_one_ro(status
);
207 define_one_ro(capabilities
);
208 define_one_ro(resources
);
210 static 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
,
222 static struct attribute_group err_inject_attr_group
= {
223 .attrs
= default_attrs
,
226 /* Add/Remove err_inject interface for CPU device */
227 static int err_inject_add_dev(unsigned int cpu
)
229 struct device
*sys_dev
= get_cpu_device(cpu
);
231 return sysfs_create_group(&sys_dev
->kobj
, &err_inject_attr_group
);
234 static int err_inject_remove_dev(unsigned int cpu
)
236 struct device
*sys_dev
= get_cpu_device(cpu
);
238 sysfs_remove_group(&sys_dev
->kobj
, &err_inject_attr_group
);
242 static enum cpuhp_state hp_online
;
244 static int __init
err_inject_init(void)
248 printk(KERN_INFO
"Enter error injection driver.\n");
251 ret
= cpuhp_setup_state(CPUHP_AP_ONLINE_DYN
, "ia64/err_inj:online",
252 err_inject_add_dev
, err_inject_remove_dev
);
260 static void __exit
err_inject_exit(void)
263 printk(KERN_INFO
"Exit error injection driver.\n");
265 cpuhp_remove_state(hp_online
);
268 module_init(err_inject_init
);
269 module_exit(err_inject_exit
);
271 MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>");
272 MODULE_DESCRIPTION("MC error injection kernel sysfs interface");
273 MODULE_LICENSE("GPL");