amd64_edac: Fix missing csrows sysfs nodes
[linux-2.6.git] / drivers / edac / mce_amd_inj.c
1 /*
2  * A simple MCE injection facility for testing the MCE decoding code. This
3  * driver should be built as module so that it can be loaded on production
4  * kernels for testing purposes.
5  *
6  * This file may be distributed under the terms of the GNU General Public
7  * License version 2.
8  *
9  * Copyright (c) 2010:  Borislav Petkov <borislav.petkov@amd.com>
10  *                      Advanced Micro Devices Inc.
11  */
12
13 #include <linux/kobject.h>
14 #include <linux/edac.h>
15 #include <linux/module.h>
16 #include <asm/mce.h>
17
18 #include "mce_amd.h"
19
20 struct edac_mce_attr {
21         struct attribute attr;
22         ssize_t (*show) (struct kobject *kobj, struct edac_mce_attr *attr, char *buf);
23         ssize_t (*store)(struct kobject *kobj, struct edac_mce_attr *attr,
24                          const char *buf, size_t count);
25 };
26
27 #define EDAC_MCE_ATTR(_name, _mode, _show, _store)                      \
28 static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _store)
29
30 static struct kobject *mce_kobj;
31
32 /*
33  * Collect all the MCi_XXX settings
34  */
35 static struct mce i_mce;
36
37 #define MCE_INJECT_STORE(reg)                                           \
38 static ssize_t edac_inject_##reg##_store(struct kobject *kobj,          \
39                                          struct edac_mce_attr *attr,    \
40                                          const char *data, size_t count)\
41 {                                                                       \
42         int ret = 0;                                                    \
43         unsigned long value;                                            \
44                                                                         \
45         ret = strict_strtoul(data, 16, &value);                         \
46         if (ret < 0)                                                    \
47                 printk(KERN_ERR "Error writing MCE " #reg " field.\n"); \
48                                                                         \
49         i_mce.reg = value;                                              \
50                                                                         \
51         return count;                                                   \
52 }
53
54 MCE_INJECT_STORE(status);
55 MCE_INJECT_STORE(misc);
56 MCE_INJECT_STORE(addr);
57
58 #define MCE_INJECT_SHOW(reg)                                            \
59 static ssize_t edac_inject_##reg##_show(struct kobject *kobj,           \
60                                         struct edac_mce_attr *attr,     \
61                                         char *buf)                      \
62 {                                                                       \
63         return sprintf(buf, "0x%016llx\n", i_mce.reg);                  \
64 }
65
66 MCE_INJECT_SHOW(status);
67 MCE_INJECT_SHOW(misc);
68 MCE_INJECT_SHOW(addr);
69
70 EDAC_MCE_ATTR(status, 0644, edac_inject_status_show, edac_inject_status_store);
71 EDAC_MCE_ATTR(misc, 0644, edac_inject_misc_show, edac_inject_misc_store);
72 EDAC_MCE_ATTR(addr, 0644, edac_inject_addr_show, edac_inject_addr_store);
73
74 /*
75  * This denotes into which bank we're injecting and triggers
76  * the injection, at the same time.
77  */
78 static ssize_t edac_inject_bank_store(struct kobject *kobj,
79                                       struct edac_mce_attr *attr,
80                                       const char *data, size_t count)
81 {
82         int ret = 0;
83         unsigned long value;
84
85         ret = strict_strtoul(data, 10, &value);
86         if (ret < 0) {
87                 printk(KERN_ERR "Invalid bank value!\n");
88                 return -EINVAL;
89         }
90
91         if (value > 5)
92                 if (boot_cpu_data.x86 != 0x15 || value > 6) {
93                         printk(KERN_ERR "Non-existent MCE bank: %lu\n", value);
94                         return -EINVAL;
95                 }
96
97         i_mce.bank = value;
98
99         amd_decode_mce(NULL, 0, &i_mce);
100
101         return count;
102 }
103
104 static ssize_t edac_inject_bank_show(struct kobject *kobj,
105                                      struct edac_mce_attr *attr, char *buf)
106 {
107         return sprintf(buf, "%d\n", i_mce.bank);
108 }
109
110 EDAC_MCE_ATTR(bank, 0644, edac_inject_bank_show, edac_inject_bank_store);
111
112 static struct edac_mce_attr *sysfs_attrs[] = { &mce_attr_status, &mce_attr_misc,
113                                                &mce_attr_addr, &mce_attr_bank
114 };
115
116 static int __init edac_init_mce_inject(void)
117 {
118         struct bus_type *edac_subsys = NULL;
119         int i, err = 0;
120
121         edac_subsys = edac_get_sysfs_subsys();
122         if (!edac_subsys)
123                 return -EINVAL;
124
125         mce_kobj = kobject_create_and_add("mce", &edac_subsys->dev_root->kobj);
126         if (!mce_kobj) {
127                 printk(KERN_ERR "Error creating a mce kset.\n");
128                 err = -ENOMEM;
129                 goto err_mce_kobj;
130         }
131
132         for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++) {
133                 err = sysfs_create_file(mce_kobj, &sysfs_attrs[i]->attr);
134                 if (err) {
135                         printk(KERN_ERR "Error creating %s in sysfs.\n",
136                                         sysfs_attrs[i]->attr.name);
137                         goto err_sysfs_create;
138                 }
139         }
140         return 0;
141
142 err_sysfs_create:
143         while (--i >= 0)
144                 sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
145
146         kobject_del(mce_kobj);
147
148 err_mce_kobj:
149         edac_put_sysfs_subsys();
150
151         return err;
152 }
153
154 static void __exit edac_exit_mce_inject(void)
155 {
156         int i;
157
158         for (i = 0; i < ARRAY_SIZE(sysfs_attrs); i++)
159                 sysfs_remove_file(mce_kobj, &sysfs_attrs[i]->attr);
160
161         kobject_del(mce_kobj);
162
163         edac_put_sysfs_subsys();
164 }
165
166 module_init(edac_init_mce_inject);
167 module_exit(edac_exit_mce_inject);
168
169 MODULE_LICENSE("GPL");
170 MODULE_AUTHOR("Borislav Petkov <borislav.petkov@amd.com>");
171 MODULE_AUTHOR("AMD Inc.");
172 MODULE_DESCRIPTION("MCE injection facility for testing MCE decoding");