1#include "edac_module.h"
2
3static struct dentry *edac_debugfs;
4
5static ssize_t edac_fake_inject_write(struct file *file,
6				      const char __user *data,
7				      size_t count, loff_t *ppos)
8{
9	struct device *dev = file->private_data;
10	struct mem_ctl_info *mci = to_mci(dev);
11	static enum hw_event_mc_err_type type;
12	u16 errcount = mci->fake_inject_count;
13
14	if (!errcount)
15		errcount = 1;
16
17	type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
18				   : HW_EVENT_ERR_CORRECTED;
19
20	printk(KERN_DEBUG
21	       "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",
22		errcount,
23		(type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
24		errcount > 1 ? "s" : "",
25		mci->fake_inject_layer[0],
26		mci->fake_inject_layer[1],
27		mci->fake_inject_layer[2]
28	       );
29	edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
30			     mci->fake_inject_layer[0],
31			     mci->fake_inject_layer[1],
32			     mci->fake_inject_layer[2],
33			     "FAKE ERROR", "for EDAC testing only");
34
35	return count;
36}
37
38static const struct file_operations debug_fake_inject_fops = {
39	.open = simple_open,
40	.write = edac_fake_inject_write,
41	.llseek = generic_file_llseek,
42};
43
44int __init edac_debugfs_init(void)
45{
46	edac_debugfs = debugfs_create_dir("edac", NULL);
47	if (IS_ERR(edac_debugfs)) {
48		edac_debugfs = NULL;
49		return -ENOMEM;
50	}
51	return 0;
52}
53
54void edac_debugfs_exit(void)
55{
56	debugfs_remove(edac_debugfs);
57}
58
59int edac_create_debugfs_nodes(struct mem_ctl_info *mci)
60{
61	struct dentry *d, *parent;
62	char name[80];
63	int i;
64
65	if (!edac_debugfs)
66		return -ENODEV;
67
68	d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
69	if (!d)
70		return -ENOMEM;
71	parent = d;
72
73	for (i = 0; i < mci->n_layers; i++) {
74		sprintf(name, "fake_inject_%s",
75			     edac_layer_name[mci->layers[i].type]);
76		d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
77				      &mci->fake_inject_layer[i]);
78		if (!d)
79			goto nomem;
80	}
81
82	d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
83				&mci->fake_inject_ue);
84	if (!d)
85		goto nomem;
86
87	d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
88				&mci->fake_inject_count);
89	if (!d)
90		goto nomem;
91
92	d = debugfs_create_file("fake_inject", S_IWUSR, parent,
93				&mci->dev,
94				&debug_fake_inject_fops);
95	if (!d)
96		goto nomem;
97
98	mci->debugfs = parent;
99	return 0;
100nomem:
101	edac_debugfs_remove_recursive(mci->debugfs);
102	return -ENOMEM;
103}
104
105/* Create a toplevel dir under EDAC's debugfs hierarchy */
106struct dentry *edac_debugfs_create_dir(const char *dirname)
107{
108	if (!edac_debugfs)
109		return NULL;
110
111	return debugfs_create_dir(dirname, edac_debugfs);
112}
113EXPORT_SYMBOL_GPL(edac_debugfs_create_dir);
114
115/* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */
116struct dentry *
117edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)
118{
119	return debugfs_create_dir(dirname, parent);
120}
121EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at);
122
123/*
124 * Create a file under EDAC's hierarchy or a sub-hierarchy:
125 *
126 * @name: file name
127 * @mode: file permissions
128 * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir
129 * @data: private data of caller
130 * @fops: file operations of this file
131 */
132struct dentry *
133edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent,
134			 void *data, const struct file_operations *fops)
135{
136	if (!parent)
137		parent = edac_debugfs;
138
139	return debugfs_create_file(name, mode, parent, data, fops);
140}
141EXPORT_SYMBOL_GPL(edac_debugfs_create_file);
142
143/* Wrapper for debugfs_create_x8() */
144struct dentry *edac_debugfs_create_x8(const char *name, umode_t mode,
145				       struct dentry *parent, u8 *value)
146{
147	if (!parent)
148		parent = edac_debugfs;
149
150	return debugfs_create_x8(name, mode, parent, value);
151}
152EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);
153
154/* Wrapper for debugfs_create_x16() */
155struct dentry *edac_debugfs_create_x16(const char *name, umode_t mode,
156				       struct dentry *parent, u16 *value)
157{
158	if (!parent)
159		parent = edac_debugfs;
160
161	return debugfs_create_x16(name, mode, parent, value);
162}
163EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);
164