1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/string_choices.h>
4
5#include "edac_module.h"
6
7static struct dentry *edac_debugfs;
8
9static ssize_t edac_fake_inject_write(struct file *file,
10 const char __user *data,
11 size_t count, loff_t *ppos)
12{
13 struct device *dev = file->private_data;
14 struct mem_ctl_info *mci = to_mci(dev);
15 static enum hw_event_mc_err_type type;
16 u16 errcount = mci->fake_inject_count;
17
18 if (!errcount)
19 errcount = 1;
20
21 type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
22 : HW_EVENT_ERR_CORRECTED;
23
24 printk(KERN_DEBUG
25 "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",
26 errcount,
27 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
28 str_plural(errcount),
29 mci->fake_inject_layer[0],
30 mci->fake_inject_layer[1],
31 mci->fake_inject_layer[2]
32 );
33 edac_mc_handle_error(type, mci, error_count: errcount, page_frame_number: 0, offset_in_page: 0, syndrome: 0,
34 top_layer: mci->fake_inject_layer[0],
35 mid_layer: mci->fake_inject_layer[1],
36 low_layer: mci->fake_inject_layer[2],
37 msg: "FAKE ERROR", other_detail: "for EDAC testing only");
38
39 return count;
40}
41
42static const struct file_operations debug_fake_inject_fops = {
43 .open = simple_open,
44 .write = edac_fake_inject_write,
45 .llseek = generic_file_llseek,
46};
47
48void __init edac_debugfs_init(void)
49{
50 edac_debugfs = debugfs_create_dir(name: "edac", NULL);
51}
52
53void edac_debugfs_exit(void)
54{
55 debugfs_remove_recursive(dentry: edac_debugfs);
56}
57
58void edac_create_debugfs_nodes(struct mem_ctl_info *mci)
59{
60 struct dentry *parent;
61 char name[80];
62 int i;
63
64 parent = debugfs_create_dir(name: mci->dev.kobj.name, parent: edac_debugfs);
65
66 for (i = 0; i < mci->n_layers; i++) {
67 sprintf(buf: name, fmt: "fake_inject_%s",
68 edac_layer_name[mci->layers[i].type]);
69 debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
70 value: &mci->fake_inject_layer[i]);
71 }
72
73 debugfs_create_bool(name: "fake_inject_ue", S_IRUGO | S_IWUSR, parent,
74 value: &mci->fake_inject_ue);
75
76 debugfs_create_u16(name: "fake_inject_count", S_IRUGO | S_IWUSR, parent,
77 value: &mci->fake_inject_count);
78
79 debugfs_create_file("fake_inject", S_IWUSR, parent, &mci->dev,
80 &debug_fake_inject_fops);
81
82 mci->debugfs = parent;
83}
84
85/* Create a toplevel dir under EDAC's debugfs hierarchy */
86struct dentry *edac_debugfs_create_dir(const char *dirname)
87{
88 if (!edac_debugfs)
89 return NULL;
90
91 return debugfs_create_dir(name: dirname, parent: edac_debugfs);
92}
93EXPORT_SYMBOL_GPL(edac_debugfs_create_dir);
94
95/* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */
96struct dentry *
97edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)
98{
99 return debugfs_create_dir(name: dirname, parent);
100}
101EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at);
102
103/*
104 * Create a file under EDAC's hierarchy or a sub-hierarchy:
105 *
106 * @name: file name
107 * @mode: file permissions
108 * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir
109 * @data: private data of caller
110 * @fops: file operations of this file
111 */
112struct dentry *
113edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent,
114 void *data, const struct file_operations *fops)
115{
116 if (!parent)
117 parent = edac_debugfs;
118
119 return debugfs_create_file(name, mode, parent, data, fops);
120}
121EXPORT_SYMBOL_GPL(edac_debugfs_create_file);
122
123/* Wrapper for debugfs_create_x8() */
124void edac_debugfs_create_x8(const char *name, umode_t mode,
125 struct dentry *parent, u8 *value)
126{
127 if (!parent)
128 parent = edac_debugfs;
129
130 debugfs_create_x8(name, mode, parent, value);
131}
132EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);
133
134/* Wrapper for debugfs_create_x16() */
135void edac_debugfs_create_x16(const char *name, umode_t mode,
136 struct dentry *parent, u16 *value)
137{
138 if (!parent)
139 parent = edac_debugfs;
140
141 debugfs_create_x16(name, mode, parent, value);
142}
143EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);
144
145/* Wrapper for debugfs_create_x32() */
146void edac_debugfs_create_x32(const char *name, umode_t mode,
147 struct dentry *parent, u32 *value)
148{
149 if (!parent)
150 parent = edac_debugfs;
151
152 debugfs_create_x32(name, mode, parent, value);
153}
154EXPORT_SYMBOL_GPL(edac_debugfs_create_x32);
155

source code of linux/drivers/edac/debugfs.c