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
164
165
166
167
168
169
170
171
172
173
174
175
176
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Architecture specific debugfs files
*
* Copyright (C) 2007, Intel Corp.
* Huang Ying <ying.huang@intel.com>
*/
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <asm/setup.h>
struct dentry *arch_debugfs_dir;
EXPORT_SYMBOL(arch_debugfs_dir);
#ifdef CONFIG_DEBUG_BOOT_PARAMS
struct setup_data_node {
u64 paddr;
u32 type;
u32 len;
};
static ssize_t setup_data_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct setup_data_node *node = file->private_data;
unsigned long remain;
loff_t pos = *ppos;
void *p;
u64 pa;
if (pos < 0)
return -EINVAL;
if (pos >= node->len)
return 0;
if (count > node->len - pos)
count = node->len - pos;
pa = node->paddr + pos;
/* Is it direct data or invalid indirect one? */
if (!(node->type & SETUP_INDIRECT) || node->type == SETUP_INDIRECT)
pa += sizeof(struct setup_data);
p = memremap(pa, count, MEMREMAP_WB);
if (!p)
return -ENOMEM;
remain = copy_to_user(user_buf, p, count);
memunmap(p);
if (remain)
return -EFAULT;
*ppos = pos + count;
return count;
}
static const struct file_operations fops_setup_data = {
.read = setup_data_read,
.open = simple_open,
.llseek = default_llseek,
};
static void __init
create_setup_data_node(struct dentry *parent, int no,
struct setup_data_node *node)
{
struct dentry *d;
char buf[16];
sprintf(buf, "%d", no);
d = debugfs_create_dir(buf, parent);
debugfs_create_x32("type", S_IRUGO, d, &node->type);
debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
}
static int __init create_setup_data_nodes(struct dentry *parent)
{
struct setup_data_node *node;
struct setup_data *data;
int error;
struct dentry *d;
u64 pa_data;
int no = 0;
d = debugfs_create_dir("setup_data", parent);
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
node = kmalloc(sizeof(*node), GFP_KERNEL);
if (!node) {
error = -ENOMEM;
goto err_dir;
}
data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
if (!data) {
kfree(node);
error = -ENOMEM;
goto err_dir;
}
if (data->type == SETUP_INDIRECT &&
((struct setup_indirect *)data->data)->type != SETUP_INDIRECT) {
node->paddr = ((struct setup_indirect *)data->data)->addr;
node->type = ((struct setup_indirect *)data->data)->type;
node->len = ((struct setup_indirect *)data->data)->len;
} else {
node->paddr = pa_data;
node->type = data->type;
node->len = data->len;
}
create_setup_data_node(d, no, node);
pa_data = data->next;
memunmap(data);
no++;
}
return 0;
err_dir:
debugfs_remove_recursive(d);
return error;
}
static struct debugfs_blob_wrapper boot_params_blob = {
.data = &boot_params,
.size = sizeof(boot_params),
};
static int __init boot_params_kdebugfs_init(void)
{
struct dentry *dbp;
int error;
dbp = debugfs_create_dir("boot_params", arch_debugfs_dir);
debugfs_create_x16("version", S_IRUGO, dbp, &boot_params.hdr.version);
debugfs_create_blob("data", S_IRUGO, dbp, &boot_params_blob);
error = create_setup_data_nodes(dbp);
if (error)
debugfs_remove_recursive(dbp);
return error;
}
#endif /* CONFIG_DEBUG_BOOT_PARAMS */
static int __init arch_kdebugfs_init(void)
{
int error = 0;
arch_debugfs_dir = debugfs_create_dir("x86", NULL);
#ifdef CONFIG_DEBUG_BOOT_PARAMS
error = boot_params_kdebugfs_init();
#endif
return error;
}
arch_initcall(arch_kdebugfs_init);
|
