Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 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 | */ |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 9 | #include <linux/debugfs.h> |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 10 | #include <linux/uaccess.h> |
Paul Gortmaker | 186f436 | 2016-07-13 20:18:56 -0400 | [diff] [blame] | 11 | #include <linux/export.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 13 | #include <linux/init.h> |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 14 | #include <linux/stat.h> |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 15 | #include <linux/io.h> |
| 16 | #include <linux/mm.h> |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 17 | |
| 18 | #include <asm/setup.h> |
| 19 | |
venkatesh.pallipadi@intel.com | ae79cda | 2008-07-18 16:08:13 -0700 | [diff] [blame] | 20 | struct dentry *arch_debugfs_dir; |
| 21 | EXPORT_SYMBOL(arch_debugfs_dir); |
| 22 | |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 23 | #ifdef CONFIG_DEBUG_BOOT_PARAMS |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 24 | struct setup_data_node { |
| 25 | u64 paddr; |
| 26 | u32 type; |
| 27 | u32 len; |
| 28 | }; |
| 29 | |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 30 | static ssize_t setup_data_read(struct file *file, char __user *user_buf, |
| 31 | size_t count, loff_t *ppos) |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 32 | { |
| 33 | struct setup_data_node *node = file->private_data; |
| 34 | unsigned long remain; |
| 35 | loff_t pos = *ppos; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 36 | void *p; |
| 37 | u64 pa; |
| 38 | |
| 39 | if (pos < 0) |
| 40 | return -EINVAL; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 41 | |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 42 | if (pos >= node->len) |
| 43 | return 0; |
| 44 | |
| 45 | if (count > node->len - pos) |
| 46 | count = node->len - pos; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 47 | |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 48 | pa = node->paddr + sizeof(struct setup_data) + pos; |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 49 | p = memremap(pa, count, MEMREMAP_WB); |
| 50 | if (!p) |
| 51 | return -ENOMEM; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 52 | |
| 53 | remain = copy_to_user(user_buf, p, count); |
| 54 | |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 55 | memunmap(p); |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 56 | |
| 57 | if (remain) |
| 58 | return -EFAULT; |
| 59 | |
| 60 | *ppos = pos + count; |
| 61 | |
| 62 | return count; |
| 63 | } |
| 64 | |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 65 | static const struct file_operations fops_setup_data = { |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 66 | .read = setup_data_read, |
Stephen Boyd | 234e340 | 2012-04-05 14:25:11 -0700 | [diff] [blame] | 67 | .open = simple_open, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 68 | .llseek = default_llseek, |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 69 | }; |
| 70 | |
| 71 | static int __init |
| 72 | create_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, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 77 | |
| 78 | sprintf(buf, "%d", no); |
| 79 | d = debugfs_create_dir(buf, parent); |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 80 | if (!d) |
| 81 | return -ENOMEM; |
| 82 | |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 83 | type = debugfs_create_x32("type", S_IRUGO, d, &node->type); |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 84 | if (!type) |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 85 | goto err_dir; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 86 | |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 87 | data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data); |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 88 | if (!data) |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 89 | goto err_type; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 90 | |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 91 | return 0; |
| 92 | |
| 93 | err_type: |
| 94 | debugfs_remove(type); |
| 95 | err_dir: |
| 96 | debugfs_remove(d); |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 97 | return -ENOMEM; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | static int __init create_setup_data_nodes(struct dentry *parent) |
| 101 | { |
| 102 | struct setup_data_node *node; |
| 103 | struct setup_data *data; |
Julia Lawall | 41fb433 | 2012-07-14 18:43:08 +0200 | [diff] [blame] | 104 | int error; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 105 | struct dentry *d; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 106 | u64 pa_data; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 107 | int no = 0; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 108 | |
| 109 | d = debugfs_create_dir("setup_data", parent); |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 110 | if (!d) |
| 111 | return -ENOMEM; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 112 | |
| 113 | pa_data = boot_params.hdr.setup_data; |
| 114 | |
| 115 | while (pa_data) { |
| 116 | node = kmalloc(sizeof(*node), GFP_KERNEL); |
Julia Lawall | 41fb433 | 2012-07-14 18:43:08 +0200 | [diff] [blame] | 117 | if (!node) { |
| 118 | error = -ENOMEM; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 119 | goto err_dir; |
Julia Lawall | 41fb433 | 2012-07-14 18:43:08 +0200 | [diff] [blame] | 120 | } |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 121 | |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 122 | data = memremap(pa_data, sizeof(*data), MEMREMAP_WB); |
| 123 | if (!data) { |
| 124 | kfree(node); |
| 125 | error = -ENOMEM; |
| 126 | goto err_dir; |
| 127 | } |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 128 | |
| 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 Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 135 | memunmap(data); |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 136 | if (error) |
| 137 | goto err_dir; |
| 138 | no++; |
| 139 | } |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 140 | |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 141 | return 0; |
| 142 | |
| 143 | err_dir: |
| 144 | debugfs_remove(d); |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 145 | return error; |
| 146 | } |
| 147 | |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 148 | static struct debugfs_blob_wrapper boot_params_blob = { |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 149 | .data = &boot_params, |
| 150 | .size = sizeof(boot_params), |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 151 | }; |
| 152 | |
| 153 | static int __init boot_params_kdebugfs_init(void) |
| 154 | { |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 155 | struct dentry *dbp, *version, *data; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 156 | int error = -ENOMEM; |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 157 | |
Borislav Petkov | 10bce84 | 2017-02-27 23:50:58 +0100 | [diff] [blame] | 158 | dbp = debugfs_create_dir("boot_params", arch_debugfs_dir); |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 159 | if (!dbp) |
| 160 | return -ENOMEM; |
| 161 | |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 162 | version = debugfs_create_x16("version", S_IRUGO, dbp, |
| 163 | &boot_params.hdr.version); |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 164 | if (!version) |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 165 | goto err_dir; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 166 | |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 167 | data = debugfs_create_blob("data", S_IRUGO, dbp, |
| 168 | &boot_params_blob); |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 169 | if (!data) |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 170 | goto err_version; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 171 | |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 172 | error = create_setup_data_nodes(dbp); |
| 173 | if (error) |
| 174 | goto err_data; |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 175 | |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 176 | return 0; |
Huang, Ying | c14b2ad | 2008-03-28 10:49:48 +0800 | [diff] [blame] | 177 | |
| 178 | err_data: |
| 179 | debugfs_remove(data); |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 180 | err_version: |
| 181 | debugfs_remove(version); |
| 182 | err_dir: |
| 183 | debugfs_remove(dbp); |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 184 | return error; |
| 185 | } |
Jaswinder Singh Rajput | 390cd85c | 2009-03-21 16:55:45 +0530 | [diff] [blame] | 186 | #endif /* CONFIG_DEBUG_BOOT_PARAMS */ |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 187 | |
| 188 | static int __init arch_kdebugfs_init(void) |
| 189 | { |
| 190 | int error = 0; |
| 191 | |
venkatesh.pallipadi@intel.com | ae79cda | 2008-07-18 16:08:13 -0700 | [diff] [blame] | 192 | arch_debugfs_dir = debugfs_create_dir("x86", NULL); |
| 193 | if (!arch_debugfs_dir) |
| 194 | return -ENOMEM; |
| 195 | |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 196 | #ifdef CONFIG_DEBUG_BOOT_PARAMS |
| 197 | error = boot_params_kdebugfs_init(); |
| 198 | #endif |
| 199 | |
| 200 | return error; |
| 201 | } |
Huang, Ying | 6d7d743 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 202 | arch_initcall(arch_kdebugfs_init); |