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