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Huang, Ying6d7d7432008-01-30 13:32:51 +01001/*
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 */
Huang, Ying6d7d7432008-01-30 13:32:51 +01009#include <linux/debugfs.h>
Huang, Yingc14b2ad2008-03-28 10:49:48 +080010#include <linux/uaccess.h>
Paul Gortmaker186f4362016-07-13 20:18:56 -040011#include <linux/export.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Huang, Ying6d7d7432008-01-30 13:32:51 +010013#include <linux/init.h>
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053014#include <linux/stat.h>
Huang, Yingc14b2ad2008-03-28 10:49:48 +080015#include <linux/io.h>
16#include <linux/mm.h>
Huang, Ying6d7d7432008-01-30 13:32:51 +010017
18#include <asm/setup.h>
19
venkatesh.pallipadi@intel.comae79cda2008-07-18 16:08:13 -070020struct dentry *arch_debugfs_dir;
21EXPORT_SYMBOL(arch_debugfs_dir);
22
Huang, Ying6d7d7432008-01-30 13:32:51 +010023#ifdef CONFIG_DEBUG_BOOT_PARAMS
Huang, Yingc14b2ad2008-03-28 10:49:48 +080024struct setup_data_node {
25 u64 paddr;
26 u32 type;
27 u32 len;
28};
29
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053030static ssize_t setup_data_read(struct file *file, char __user *user_buf,
31 size_t count, loff_t *ppos)
Huang, Yingc14b2ad2008-03-28 10:49:48 +080032{
33 struct setup_data_node *node = file->private_data;
34 unsigned long remain;
35 loff_t pos = *ppos;
Huang, Yingc14b2ad2008-03-28 10:49:48 +080036 void *p;
37 u64 pa;
38
39 if (pos < 0)
40 return -EINVAL;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053041
Huang, Yingc14b2ad2008-03-28 10:49:48 +080042 if (pos >= node->len)
43 return 0;
44
45 if (count > node->len - pos)
46 count = node->len - pos;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053047
Huang, Yingc14b2ad2008-03-28 10:49:48 +080048 pa = node->paddr + sizeof(struct setup_data) + pos;
Tom Lendackyf7750a72017-07-17 16:10:00 -050049 p = memremap(pa, count, MEMREMAP_WB);
50 if (!p)
51 return -ENOMEM;
Huang, Yingc14b2ad2008-03-28 10:49:48 +080052
53 remain = copy_to_user(user_buf, p, count);
54
Tom Lendackyf7750a72017-07-17 16:10:00 -050055 memunmap(p);
Huang, Yingc14b2ad2008-03-28 10:49:48 +080056
57 if (remain)
58 return -EFAULT;
59
60 *ppos = pos + count;
61
62 return count;
63}
64
Huang, Yingc14b2ad2008-03-28 10:49:48 +080065static const struct file_operations fops_setup_data = {
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053066 .read = setup_data_read,
Stephen Boyd234e3402012-04-05 14:25:11 -070067 .open = simple_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +020068 .llseek = default_llseek,
Huang, Yingc14b2ad2008-03-28 10:49:48 +080069};
70
71static int __init
72create_setup_data_node(struct dentry *parent, int no,
73 struct setup_data_node *node)
74{
75 struct dentry *d, *type, *data;
76 char buf[16];
Huang, Yingc14b2ad2008-03-28 10:49:48 +080077
78 sprintf(buf, "%d", no);
79 d = debugfs_create_dir(buf, parent);
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053080 if (!d)
81 return -ENOMEM;
82
Huang, Yingc14b2ad2008-03-28 10:49:48 +080083 type = debugfs_create_x32("type", S_IRUGO, d, &node->type);
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053084 if (!type)
Huang, Yingc14b2ad2008-03-28 10:49:48 +080085 goto err_dir;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053086
Huang, Yingc14b2ad2008-03-28 10:49:48 +080087 data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053088 if (!data)
Huang, Yingc14b2ad2008-03-28 10:49:48 +080089 goto err_type;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053090
Huang, Yingc14b2ad2008-03-28 10:49:48 +080091 return 0;
92
93err_type:
94 debugfs_remove(type);
95err_dir:
96 debugfs_remove(d);
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +053097 return -ENOMEM;
Huang, Yingc14b2ad2008-03-28 10:49:48 +080098}
99
100static int __init create_setup_data_nodes(struct dentry *parent)
101{
102 struct setup_data_node *node;
103 struct setup_data *data;
Julia Lawall41fb4332012-07-14 18:43:08 +0200104 int error;
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800105 struct dentry *d;
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800106 u64 pa_data;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530107 int no = 0;
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800108
109 d = debugfs_create_dir("setup_data", parent);
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530110 if (!d)
111 return -ENOMEM;
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800112
113 pa_data = boot_params.hdr.setup_data;
114
115 while (pa_data) {
116 node = kmalloc(sizeof(*node), GFP_KERNEL);
Julia Lawall41fb4332012-07-14 18:43:08 +0200117 if (!node) {
118 error = -ENOMEM;
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800119 goto err_dir;
Julia Lawall41fb4332012-07-14 18:43:08 +0200120 }
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530121
Tom Lendackyf7750a72017-07-17 16:10:00 -0500122 data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
123 if (!data) {
124 kfree(node);
125 error = -ENOMEM;
126 goto err_dir;
127 }
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800128
129 node->paddr = pa_data;
130 node->type = data->type;
131 node->len = data->len;
132 error = create_setup_data_node(d, no, node);
133 pa_data = data->next;
134
Tom Lendackyf7750a72017-07-17 16:10:00 -0500135 memunmap(data);
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800136 if (error)
137 goto err_dir;
138 no++;
139 }
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530140
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800141 return 0;
142
143err_dir:
144 debugfs_remove(d);
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800145 return error;
146}
147
Huang, Ying6d7d7432008-01-30 13:32:51 +0100148static struct debugfs_blob_wrapper boot_params_blob = {
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800149 .data = &boot_params,
150 .size = sizeof(boot_params),
Huang, Ying6d7d7432008-01-30 13:32:51 +0100151};
152
153static int __init boot_params_kdebugfs_init(void)
154{
Huang, Ying6d7d7432008-01-30 13:32:51 +0100155 struct dentry *dbp, *version, *data;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530156 int error = -ENOMEM;
Huang, Ying6d7d7432008-01-30 13:32:51 +0100157
Borislav Petkov10bce842017-02-27 23:50:58 +0100158 dbp = debugfs_create_dir("boot_params", arch_debugfs_dir);
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530159 if (!dbp)
160 return -ENOMEM;
161
Huang, Ying6d7d7432008-01-30 13:32:51 +0100162 version = debugfs_create_x16("version", S_IRUGO, dbp,
163 &boot_params.hdr.version);
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530164 if (!version)
Huang, Ying6d7d7432008-01-30 13:32:51 +0100165 goto err_dir;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530166
Huang, Ying6d7d7432008-01-30 13:32:51 +0100167 data = debugfs_create_blob("data", S_IRUGO, dbp,
168 &boot_params_blob);
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530169 if (!data)
Huang, Ying6d7d7432008-01-30 13:32:51 +0100170 goto err_version;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530171
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800172 error = create_setup_data_nodes(dbp);
173 if (error)
174 goto err_data;
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530175
Huang, Ying6d7d7432008-01-30 13:32:51 +0100176 return 0;
Huang, Yingc14b2ad2008-03-28 10:49:48 +0800177
178err_data:
179 debugfs_remove(data);
Huang, Ying6d7d7432008-01-30 13:32:51 +0100180err_version:
181 debugfs_remove(version);
182err_dir:
183 debugfs_remove(dbp);
Huang, Ying6d7d7432008-01-30 13:32:51 +0100184 return error;
185}
Jaswinder Singh Rajput390cd85c2009-03-21 16:55:45 +0530186#endif /* CONFIG_DEBUG_BOOT_PARAMS */
Huang, Ying6d7d7432008-01-30 13:32:51 +0100187
188static int __init arch_kdebugfs_init(void)
189{
190 int error = 0;
191
venkatesh.pallipadi@intel.comae79cda2008-07-18 16:08:13 -0700192 arch_debugfs_dir = debugfs_create_dir("x86", NULL);
193 if (!arch_debugfs_dir)
194 return -ENOMEM;
195
Huang, Ying6d7d7432008-01-30 13:32:51 +0100196#ifdef CONFIG_DEBUG_BOOT_PARAMS
197 error = boot_params_kdebugfs_init();
198#endif
199
200 return error;
201}
Huang, Ying6d7d7432008-01-30 13:32:51 +0100202arch_initcall(arch_kdebugfs_init);