1 // SPDX-License-Identifier: GPL-2.0-only
2 #include "edac_module.h"
3 
4 static struct dentry *edac_debugfs;
5 
edac_fake_inject_write(struct file * file,const char __user * data,size_t count,loff_t * ppos)6 static ssize_t edac_fake_inject_write(struct file *file,
7 				      const char __user *data,
8 				      size_t count, loff_t *ppos)
9 {
10 	struct device *dev = file->private_data;
11 	struct mem_ctl_info *mci = to_mci(dev);
12 	static enum hw_event_mc_err_type type;
13 	u16 errcount = mci->fake_inject_count;
14 
15 	if (!errcount)
16 		errcount = 1;
17 
18 	type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
19 				   : HW_EVENT_ERR_CORRECTED;
20 
21 	printk(KERN_DEBUG
22 	       "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",
23 		errcount,
24 		(type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
25 		errcount > 1 ? "s" : "",
26 		mci->fake_inject_layer[0],
27 		mci->fake_inject_layer[1],
28 		mci->fake_inject_layer[2]
29 	       );
30 	edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
31 			     mci->fake_inject_layer[0],
32 			     mci->fake_inject_layer[1],
33 			     mci->fake_inject_layer[2],
34 			     "FAKE ERROR", "for EDAC testing only");
35 
36 	return count;
37 }
38 
39 static const struct file_operations debug_fake_inject_fops = {
40 	.open = simple_open,
41 	.write = edac_fake_inject_write,
42 	.llseek = generic_file_llseek,
43 };
44 
edac_debugfs_init(void)45 void __init edac_debugfs_init(void)
46 {
47 	edac_debugfs = debugfs_create_dir("edac", NULL);
48 }
49 
edac_debugfs_exit(void)50 void edac_debugfs_exit(void)
51 {
52 	debugfs_remove_recursive(edac_debugfs);
53 }
54 
edac_create_debugfs_nodes(struct mem_ctl_info * mci)55 void edac_create_debugfs_nodes(struct mem_ctl_info *mci)
56 {
57 	struct dentry *parent;
58 	char name[80];
59 	int i;
60 
61 	parent = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
62 
63 	for (i = 0; i < mci->n_layers; i++) {
64 		sprintf(name, "fake_inject_%s",
65 			     edac_layer_name[mci->layers[i].type]);
66 		debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
67 				  &mci->fake_inject_layer[i]);
68 	}
69 
70 	debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
71 			    &mci->fake_inject_ue);
72 
73 	debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
74 			   &mci->fake_inject_count);
75 
76 	debugfs_create_file("fake_inject", S_IWUSR, parent, &mci->dev,
77 			    &debug_fake_inject_fops);
78 
79 	mci->debugfs = parent;
80 }
81 
82 /* Create a toplevel dir under EDAC's debugfs hierarchy */
edac_debugfs_create_dir(const char * dirname)83 struct dentry *edac_debugfs_create_dir(const char *dirname)
84 {
85 	if (!edac_debugfs)
86 		return NULL;
87 
88 	return debugfs_create_dir(dirname, edac_debugfs);
89 }
90 EXPORT_SYMBOL_GPL(edac_debugfs_create_dir);
91 
92 /* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */
93 struct dentry *
edac_debugfs_create_dir_at(const char * dirname,struct dentry * parent)94 edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)
95 {
96 	return debugfs_create_dir(dirname, parent);
97 }
98 EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at);
99 
100 /*
101  * Create a file under EDAC's hierarchy or a sub-hierarchy:
102  *
103  * @name: file name
104  * @mode: file permissions
105  * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir
106  * @data: private data of caller
107  * @fops: file operations of this file
108  */
109 struct dentry *
edac_debugfs_create_file(const char * name,umode_t mode,struct dentry * parent,void * data,const struct file_operations * fops)110 edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent,
111 			 void *data, const struct file_operations *fops)
112 {
113 	if (!parent)
114 		parent = edac_debugfs;
115 
116 	return debugfs_create_file(name, mode, parent, data, fops);
117 }
118 EXPORT_SYMBOL_GPL(edac_debugfs_create_file);
119 
120 /* Wrapper for debugfs_create_x8() */
edac_debugfs_create_x8(const char * name,umode_t mode,struct dentry * parent,u8 * value)121 void edac_debugfs_create_x8(const char *name, umode_t mode,
122 			    struct dentry *parent, u8 *value)
123 {
124 	if (!parent)
125 		parent = edac_debugfs;
126 
127 	debugfs_create_x8(name, mode, parent, value);
128 }
129 EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);
130 
131 /* Wrapper for debugfs_create_x16() */
edac_debugfs_create_x16(const char * name,umode_t mode,struct dentry * parent,u16 * value)132 void edac_debugfs_create_x16(const char *name, umode_t mode,
133 			     struct dentry *parent, u16 *value)
134 {
135 	if (!parent)
136 		parent = edac_debugfs;
137 
138 	debugfs_create_x16(name, mode, parent, value);
139 }
140 EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);
141 
142 /* Wrapper for debugfs_create_x32() */
edac_debugfs_create_x32(const char * name,umode_t mode,struct dentry * parent,u32 * value)143 void edac_debugfs_create_x32(const char *name, umode_t mode,
144 			     struct dentry *parent, u32 *value)
145 {
146 	if (!parent)
147 		parent = edac_debugfs;
148 
149 	debugfs_create_x32(name, mode, parent, value);
150 }
151 EXPORT_SYMBOL_GPL(edac_debugfs_create_x32);
152