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Commit | Line | Data |
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6d7d7433 HY |
1 | /* |
2 | * Architecture specific debugfs files | |
3 | * | |
4 | * Copyright (C) 2007, Intel Corp. | |
5 | * Huang Ying <ying.huang@intel.com> | |
6 | * | |
7 | * This file is released under the GPLv2. | |
8 | */ | |
6d7d7433 | 9 | #include <linux/debugfs.h> |
c14b2adf | 10 | #include <linux/uaccess.h> |
6d7d7433 HY |
11 | #include <linux/stat.h> |
12 | #include <linux/init.h> | |
c14b2adf HY |
13 | #include <linux/io.h> |
14 | #include <linux/mm.h> | |
ae79cdaa | 15 | #include <linux/module.h> |
6d7d7433 HY |
16 | |
17 | #include <asm/setup.h> | |
18 | ||
ae79cdaa | 19 | struct dentry *arch_debugfs_dir; |
20 | EXPORT_SYMBOL(arch_debugfs_dir); | |
21 | ||
6d7d7433 | 22 | #ifdef CONFIG_DEBUG_BOOT_PARAMS |
c14b2adf HY |
23 | struct setup_data_node { |
24 | u64 paddr; | |
25 | u32 type; | |
26 | u32 len; | |
27 | }; | |
28 | ||
29 | static ssize_t | |
30 | setup_data_read(struct file *file, char __user *user_buf, size_t count, | |
31 | loff_t *ppos) | |
32 | { | |
33 | struct setup_data_node *node = file->private_data; | |
34 | unsigned long remain; | |
35 | loff_t pos = *ppos; | |
36 | struct page *pg; | |
37 | void *p; | |
38 | u64 pa; | |
39 | ||
40 | if (pos < 0) | |
41 | return -EINVAL; | |
42 | if (pos >= node->len) | |
43 | return 0; | |
44 | ||
45 | if (count > node->len - pos) | |
46 | count = node->len - pos; | |
47 | pa = node->paddr + sizeof(struct setup_data) + pos; | |
48 | pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT); | |
49 | if (PageHighMem(pg)) { | |
50 | p = ioremap_cache(pa, count); | |
51 | if (!p) | |
52 | return -ENXIO; | |
53 | } else { | |
54 | p = __va(pa); | |
55 | } | |
56 | ||
57 | remain = copy_to_user(user_buf, p, count); | |
58 | ||
59 | if (PageHighMem(pg)) | |
60 | iounmap(p); | |
61 | ||
62 | if (remain) | |
63 | return -EFAULT; | |
64 | ||
65 | *ppos = pos + count; | |
66 | ||
67 | return count; | |
68 | } | |
69 | ||
70 | static int setup_data_open(struct inode *inode, struct file *file) | |
71 | { | |
72 | file->private_data = inode->i_private; | |
73 | return 0; | |
74 | } | |
75 | ||
76 | static const struct file_operations fops_setup_data = { | |
77 | .read = setup_data_read, | |
78 | .open = setup_data_open, | |
79 | }; | |
80 | ||
81 | static int __init | |
82 | create_setup_data_node(struct dentry *parent, int no, | |
83 | struct setup_data_node *node) | |
84 | { | |
85 | struct dentry *d, *type, *data; | |
86 | char buf[16]; | |
87 | int error; | |
88 | ||
89 | sprintf(buf, "%d", no); | |
90 | d = debugfs_create_dir(buf, parent); | |
91 | if (!d) { | |
92 | error = -ENOMEM; | |
93 | goto err_return; | |
94 | } | |
95 | type = debugfs_create_x32("type", S_IRUGO, d, &node->type); | |
96 | if (!type) { | |
97 | error = -ENOMEM; | |
98 | goto err_dir; | |
99 | } | |
100 | data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data); | |
101 | if (!data) { | |
102 | error = -ENOMEM; | |
103 | goto err_type; | |
104 | } | |
105 | return 0; | |
106 | ||
107 | err_type: | |
108 | debugfs_remove(type); | |
109 | err_dir: | |
110 | debugfs_remove(d); | |
111 | err_return: | |
112 | return error; | |
113 | } | |
114 | ||
115 | static int __init create_setup_data_nodes(struct dentry *parent) | |
116 | { | |
117 | struct setup_data_node *node; | |
118 | struct setup_data *data; | |
119 | int error, no = 0; | |
120 | struct dentry *d; | |
121 | struct page *pg; | |
122 | u64 pa_data; | |
123 | ||
124 | d = debugfs_create_dir("setup_data", parent); | |
125 | if (!d) { | |
126 | error = -ENOMEM; | |
127 | goto err_return; | |
128 | } | |
129 | ||
130 | pa_data = boot_params.hdr.setup_data; | |
131 | ||
132 | while (pa_data) { | |
133 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
134 | if (!node) { | |
135 | error = -ENOMEM; | |
136 | goto err_dir; | |
137 | } | |
138 | pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT); | |
139 | if (PageHighMem(pg)) { | |
140 | data = ioremap_cache(pa_data, sizeof(*data)); | |
141 | if (!data) { | |
f461a1d8 | 142 | kfree(node); |
c14b2adf HY |
143 | error = -ENXIO; |
144 | goto err_dir; | |
145 | } | |
146 | } else { | |
147 | data = __va(pa_data); | |
148 | } | |
149 | ||
150 | node->paddr = pa_data; | |
151 | node->type = data->type; | |
152 | node->len = data->len; | |
153 | error = create_setup_data_node(d, no, node); | |
154 | pa_data = data->next; | |
155 | ||
156 | if (PageHighMem(pg)) | |
157 | iounmap(data); | |
158 | if (error) | |
159 | goto err_dir; | |
160 | no++; | |
161 | } | |
162 | return 0; | |
163 | ||
164 | err_dir: | |
165 | debugfs_remove(d); | |
166 | err_return: | |
167 | return error; | |
168 | } | |
169 | ||
6d7d7433 | 170 | static struct debugfs_blob_wrapper boot_params_blob = { |
c14b2adf HY |
171 | .data = &boot_params, |
172 | .size = sizeof(boot_params), | |
6d7d7433 HY |
173 | }; |
174 | ||
175 | static int __init boot_params_kdebugfs_init(void) | |
176 | { | |
6d7d7433 | 177 | struct dentry *dbp, *version, *data; |
c14b2adf | 178 | int error; |
6d7d7433 HY |
179 | |
180 | dbp = debugfs_create_dir("boot_params", NULL); | |
181 | if (!dbp) { | |
182 | error = -ENOMEM; | |
183 | goto err_return; | |
184 | } | |
185 | version = debugfs_create_x16("version", S_IRUGO, dbp, | |
186 | &boot_params.hdr.version); | |
187 | if (!version) { | |
188 | error = -ENOMEM; | |
189 | goto err_dir; | |
190 | } | |
191 | data = debugfs_create_blob("data", S_IRUGO, dbp, | |
192 | &boot_params_blob); | |
193 | if (!data) { | |
194 | error = -ENOMEM; | |
195 | goto err_version; | |
196 | } | |
c14b2adf HY |
197 | error = create_setup_data_nodes(dbp); |
198 | if (error) | |
199 | goto err_data; | |
6d7d7433 | 200 | return 0; |
c14b2adf HY |
201 | |
202 | err_data: | |
203 | debugfs_remove(data); | |
6d7d7433 HY |
204 | err_version: |
205 | debugfs_remove(version); | |
206 | err_dir: | |
207 | debugfs_remove(dbp); | |
208 | err_return: | |
209 | return error; | |
210 | } | |
211 | #endif | |
212 | ||
213 | static int __init arch_kdebugfs_init(void) | |
214 | { | |
215 | int error = 0; | |
216 | ||
ae79cdaa | 217 | arch_debugfs_dir = debugfs_create_dir("x86", NULL); |
218 | if (!arch_debugfs_dir) | |
219 | return -ENOMEM; | |
220 | ||
6d7d7433 HY |
221 | #ifdef CONFIG_DEBUG_BOOT_PARAMS |
222 | error = boot_params_kdebugfs_init(); | |
223 | #endif | |
224 | ||
225 | return error; | |
226 | } | |
6d7d7433 | 227 | arch_initcall(arch_kdebugfs_init); |