Commit | Line | Data |
---|---|---|
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> |
390cd85c | 11 | #include <linux/module.h> |
6d7d7433 | 12 | #include <linux/init.h> |
390cd85c | 13 | #include <linux/stat.h> |
c14b2adf HY |
14 | #include <linux/io.h> |
15 | #include <linux/mm.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 | ||
390cd85c JSR |
29 | static ssize_t setup_data_read(struct file *file, char __user *user_buf, |
30 | size_t count, loff_t *ppos) | |
c14b2adf HY |
31 | { |
32 | struct setup_data_node *node = file->private_data; | |
33 | unsigned long remain; | |
34 | loff_t pos = *ppos; | |
35 | struct page *pg; | |
36 | void *p; | |
37 | u64 pa; | |
38 | ||
39 | if (pos < 0) | |
40 | return -EINVAL; | |
390cd85c | 41 | |
c14b2adf HY |
42 | if (pos >= node->len) |
43 | return 0; | |
44 | ||
45 | if (count > node->len - pos) | |
46 | count = node->len - pos; | |
390cd85c | 47 | |
c14b2adf HY |
48 | pa = node->paddr + sizeof(struct setup_data) + pos; |
49 | pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT); | |
50 | if (PageHighMem(pg)) { | |
51 | p = ioremap_cache(pa, count); | |
52 | if (!p) | |
53 | return -ENXIO; | |
390cd85c | 54 | } else |
c14b2adf | 55 | p = __va(pa); |
c14b2adf HY |
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; | |
390cd85c | 73 | |
c14b2adf HY |
74 | return 0; |
75 | } | |
76 | ||
77 | static const struct file_operations fops_setup_data = { | |
390cd85c JSR |
78 | .read = setup_data_read, |
79 | .open = setup_data_open, | |
c14b2adf HY |
80 | }; |
81 | ||
82 | static int __init | |
83 | create_setup_data_node(struct dentry *parent, int no, | |
84 | struct setup_data_node *node) | |
85 | { | |
86 | struct dentry *d, *type, *data; | |
87 | char buf[16]; | |
c14b2adf HY |
88 | |
89 | sprintf(buf, "%d", no); | |
90 | d = debugfs_create_dir(buf, parent); | |
390cd85c JSR |
91 | if (!d) |
92 | return -ENOMEM; | |
93 | ||
c14b2adf | 94 | type = debugfs_create_x32("type", S_IRUGO, d, &node->type); |
390cd85c | 95 | if (!type) |
c14b2adf | 96 | goto err_dir; |
390cd85c | 97 | |
c14b2adf | 98 | data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data); |
390cd85c | 99 | if (!data) |
c14b2adf | 100 | goto err_type; |
390cd85c | 101 | |
c14b2adf HY |
102 | return 0; |
103 | ||
104 | err_type: | |
105 | debugfs_remove(type); | |
106 | err_dir: | |
107 | debugfs_remove(d); | |
390cd85c | 108 | return -ENOMEM; |
c14b2adf HY |
109 | } |
110 | ||
111 | static int __init create_setup_data_nodes(struct dentry *parent) | |
112 | { | |
113 | struct setup_data_node *node; | |
114 | struct setup_data *data; | |
390cd85c | 115 | int error = -ENOMEM; |
c14b2adf HY |
116 | struct dentry *d; |
117 | struct page *pg; | |
118 | u64 pa_data; | |
390cd85c | 119 | int no = 0; |
c14b2adf HY |
120 | |
121 | d = debugfs_create_dir("setup_data", parent); | |
390cd85c JSR |
122 | if (!d) |
123 | return -ENOMEM; | |
c14b2adf HY |
124 | |
125 | pa_data = boot_params.hdr.setup_data; | |
126 | ||
127 | while (pa_data) { | |
128 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
390cd85c | 129 | if (!node) |
c14b2adf | 130 | goto err_dir; |
390cd85c | 131 | |
c14b2adf HY |
132 | pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT); |
133 | if (PageHighMem(pg)) { | |
134 | data = ioremap_cache(pa_data, sizeof(*data)); | |
135 | if (!data) { | |
f461a1d8 | 136 | kfree(node); |
c14b2adf HY |
137 | error = -ENXIO; |
138 | goto err_dir; | |
139 | } | |
390cd85c | 140 | } else |
c14b2adf | 141 | data = __va(pa_data); |
c14b2adf HY |
142 | |
143 | node->paddr = pa_data; | |
144 | node->type = data->type; | |
145 | node->len = data->len; | |
146 | error = create_setup_data_node(d, no, node); | |
147 | pa_data = data->next; | |
148 | ||
149 | if (PageHighMem(pg)) | |
150 | iounmap(data); | |
151 | if (error) | |
152 | goto err_dir; | |
153 | no++; | |
154 | } | |
390cd85c | 155 | |
c14b2adf HY |
156 | return 0; |
157 | ||
158 | err_dir: | |
159 | debugfs_remove(d); | |
c14b2adf HY |
160 | return error; |
161 | } | |
162 | ||
6d7d7433 | 163 | static struct debugfs_blob_wrapper boot_params_blob = { |
c14b2adf HY |
164 | .data = &boot_params, |
165 | .size = sizeof(boot_params), | |
6d7d7433 HY |
166 | }; |
167 | ||
168 | static int __init boot_params_kdebugfs_init(void) | |
169 | { | |
6d7d7433 | 170 | struct dentry *dbp, *version, *data; |
390cd85c | 171 | int error = -ENOMEM; |
6d7d7433 HY |
172 | |
173 | dbp = debugfs_create_dir("boot_params", NULL); | |
390cd85c JSR |
174 | if (!dbp) |
175 | return -ENOMEM; | |
176 | ||
6d7d7433 HY |
177 | version = debugfs_create_x16("version", S_IRUGO, dbp, |
178 | &boot_params.hdr.version); | |
390cd85c | 179 | if (!version) |
6d7d7433 | 180 | goto err_dir; |
390cd85c | 181 | |
6d7d7433 HY |
182 | data = debugfs_create_blob("data", S_IRUGO, dbp, |
183 | &boot_params_blob); | |
390cd85c | 184 | if (!data) |
6d7d7433 | 185 | goto err_version; |
390cd85c | 186 | |
c14b2adf HY |
187 | error = create_setup_data_nodes(dbp); |
188 | if (error) | |
189 | goto err_data; | |
390cd85c | 190 | |
6d7d7433 | 191 | return 0; |
c14b2adf HY |
192 | |
193 | err_data: | |
194 | debugfs_remove(data); | |
6d7d7433 HY |
195 | err_version: |
196 | debugfs_remove(version); | |
197 | err_dir: | |
198 | debugfs_remove(dbp); | |
6d7d7433 HY |
199 | return error; |
200 | } | |
390cd85c | 201 | #endif /* CONFIG_DEBUG_BOOT_PARAMS */ |
6d7d7433 HY |
202 | |
203 | static int __init arch_kdebugfs_init(void) | |
204 | { | |
205 | int error = 0; | |
206 | ||
ae79cdaa | 207 | arch_debugfs_dir = debugfs_create_dir("x86", NULL); |
208 | if (!arch_debugfs_dir) | |
209 | return -ENOMEM; | |
210 | ||
6d7d7433 HY |
211 | #ifdef CONFIG_DEBUG_BOOT_PARAMS |
212 | error = boot_params_kdebugfs_init(); | |
213 | #endif | |
214 | ||
215 | return error; | |
216 | } | |
6d7d7433 | 217 | arch_initcall(arch_kdebugfs_init); |