summaryrefslogtreecommitdiffstats
path: root/drivers/edac/debugfs.c
blob: 54d2f668cb0ae09cccaf559fb199e18dda9b95bc (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
#include "edac_module.h"

static struct dentry *edac_debugfs;

static ssize_t edac_fake_inject_write(struct file *file,
				      const char __user *data,
				      size_t count, loff_t *ppos)
{
	struct device *dev = file->private_data;
	struct mem_ctl_info *mci = to_mci(dev);
	static enum hw_event_mc_err_type type;
	u16 errcount = mci->fake_inject_count;

	if (!errcount)
		errcount = 1;

	type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
				   : HW_EVENT_ERR_CORRECTED;

	printk(KERN_DEBUG
	       "Generating %d %s fake error%s to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
		errcount,
		(type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
		errcount > 1 ? "s" : "",
		mci->fake_inject_layer[0],
		mci->fake_inject_layer[1],
		mci->fake_inject_layer[2]
	       );
	edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
			     mci->fake_inject_layer[0],
			     mci->fake_inject_layer[1],
			     mci->fake_inject_layer[2],
			     "FAKE ERROR", "for EDAC testing only");

	return count;
}

static const struct file_operations debug_fake_inject_fops = {
	.open = simple_open,
	.write = edac_fake_inject_write,
	.llseek = generic_file_llseek,
};

int __init edac_debugfs_init(void)
{
	edac_debugfs = debugfs_create_dir("edac", NULL);
	if (IS_ERR(edac_debugfs)) {
		edac_debugfs = NULL;
		return -ENOMEM;
	}
	return 0;
}

void edac_debugfs_exit(void)
{
	debugfs_remove(edac_debugfs);
}

int edac_create_debugfs_nodes(struct mem_ctl_info *mci)
{
	struct dentry *d, *parent;
	char name[80];
	int i;

	if (!edac_debugfs)
		return -ENODEV;

	d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
	if (!d)
		return -ENOMEM;
	parent = d;

	for (i = 0; i < mci->n_layers; i++) {
		sprintf(name, "fake_inject_%s",
			     edac_layer_name[mci->layers[i].type]);
		d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
				      &mci->fake_inject_layer[i]);
		if (!d)
			goto nomem;
	}

	d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
				&mci->fake_inject_ue);
	if (!d)
		goto nomem;

	d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
				&mci->fake_inject_count);
	if (!d)
		goto nomem;

	d = debugfs_create_file("fake_inject", S_IWUSR, parent,
				&mci->dev,
				&debug_fake_inject_fops);
	if (!d)
		goto nomem;

	mci->debugfs = parent;
	return 0;
nomem:
	edac_debugfs_remove_recursive(mci->debugfs);
	return -ENOMEM;
}

/* Create a toplevel dir under EDAC's debugfs hierarchy */
struct dentry *edac_debugfs_create_dir(const char *dirname)
{
	if (!edac_debugfs)
		return NULL;

	return debugfs_create_dir(dirname, edac_debugfs);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_dir);

/* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */
struct dentry *
edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)
{
	return debugfs_create_dir(dirname, parent);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at);

/*
 * Create a file under EDAC's hierarchy or a sub-hierarchy:
 *
 * @name: file name
 * @mode: file permissions
 * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir
 * @data: private data of caller
 * @fops: file operations of this file
 */
struct dentry *
edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent,
			 void *data, const struct file_operations *fops)
{
	if (!parent)
		parent = edac_debugfs;

	return debugfs_create_file(name, mode, parent, data, fops);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_file);

/* Wrapper for debugfs_create_x8() */
struct dentry *edac_debugfs_create_x8(const char *name, umode_t mode,
				       struct dentry *parent, u8 *value)
{
	if (!parent)
		parent = edac_debugfs;

	return debugfs_create_x8(name, mode, parent, value);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);

/* Wrapper for debugfs_create_x16() */
struct dentry *edac_debugfs_create_x16(const char *name, umode_t mode,
				       struct dentry *parent, u16 *value)
{
	if (!parent)
		parent = edac_debugfs;

	return debugfs_create_x16(name, mode, parent, value);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);