/* * Architecture specific debugfs files * * Copyright (C) 2007, Intel Corp. *	Huang Ying <ying.huang@intel.com> * * This file is released under the GPLv2. */#include <linux/debugfs.h>#include <linux/uaccess.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/stat.h>#include <linux/io.h>#include <linux/mm.h> #include <asm/setup.h> struct dentry *arch_debugfs_dir;EXPORT_SYMBOL(arch_debugfs_dir); #ifdef CONFIG_DEBUG_BOOT_PARAMSstruct setup_data_node {	u64 paddr;	u32 type;	u32 len;}; static ssize_t setup_data_read(struct file *file, char __user *user_buf,			       size_t count, loff_t *ppos){	struct setup_data_node *node = file->private_data;	unsigned long remain;	loff_t pos = *ppos;	struct page *pg;	void *p;	u64 pa; 	if (pos < 0)		return -EINVAL; 	if (pos >= node->len)		return 0; 	if (count > node->len - pos)		count = node->len - pos; 	pa = node->paddr + sizeof(struct setup_data) + pos;	pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT);	if (PageHighMem(pg)) {		p = ioremap_cache(pa, count);		if (!p)			return -ENXIO;	} else		p = __va(pa); 	remain = copy_to_user(user_buf, p, count); 	if (PageHighMem(pg))		iounmap(p); 	if (remain)		return -EFAULT; 	*ppos = pos + count; 	return count;} static const struct file_operations fops_setup_data = {	.read		= setup_data_read,	.open		= simple_open,	.llseek		= default_llseek,}; static int __initcreate_setup_data_node(struct dentry *parent, int no,		       struct setup_data_node *node){	struct dentry *d, *type, *data;	char buf[16]; 	sprintf(buf, "%d", no);	d = debugfs_create_dir(buf, parent);	if (!d)		return -ENOMEM; 	type = debugfs_create_x32("type", S_IRUGO, d, &node->type);	if (!type)		goto err_dir; 	data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);	if (!data)		goto err_type; 	return 0; err_type:	debugfs_remove(type);err_dir:	debugfs_remove(d);	return -ENOMEM;} static int __init create_setup_data_nodes(struct dentry *parent){	struct setup_data_node *node;	struct setup_data *data;	int error;	struct dentry *d;	struct page *pg;	u64 pa_data;	int no = 0; 	d = debugfs_create_dir("setup_data", parent);	if (!d)		return -ENOMEM; 	pa_data = boot_params.hdr.setup_data; 	while (pa_data) {		node = kmalloc(sizeof(*node), GFP_KERNEL);		if (!node) {			error = -ENOMEM;			goto err_dir;		} 		pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT);		if (PageHighMem(pg)) {			data = ioremap_cache(pa_data, sizeof(*data));			if (!data) {				kfree(node);				error = -ENXIO;				goto err_dir;			}		} else			data = __va(pa_data); 		node->paddr = pa_data;		node->type = data->type;		node->len = data->len;		error = create_setup_data_node(d, no, node);		pa_data = data->next; 		if (PageHighMem(pg))			iounmap(data);		if (error)			goto err_dir;		no++;	} 	return 0; err_dir:	debugfs_remove(d);	return error;} static struct debugfs_blob_wrapper boot_params_blob = {	.data		= &boot_params,	.size		= sizeof(boot_params),}; static int __init boot_params_kdebugfs_init(void){	struct dentry *dbp, *version, *data;	int error = -ENOMEM; 	dbp = debugfs_create_dir("boot_params", NULL);	if (!dbp)		return -ENOMEM; 	version = debugfs_create_x16("version", S_IRUGO, dbp,				     &boot_params.hdr.version);	if (!version)		goto err_dir; 	data = debugfs_create_blob("data", S_IRUGO, dbp,				   &boot_params_blob);	if (!data)		goto err_version; 	error = create_setup_data_nodes(dbp);	if (error)		goto err_data; 	return 0; err_data:	debugfs_remove(data);err_version:	debugfs_remove(version);err_dir:	debugfs_remove(dbp);	return error;}#endif /* CONFIG_DEBUG_BOOT_PARAMS */ static int __init arch_kdebugfs_init(void){	int error = 0; 	arch_debugfs_dir = debugfs_create_dir("x86", NULL);	if (!arch_debugfs_dir)		return -ENOMEM; #ifdef CONFIG_DEBUG_BOOT_PARAMS	error = boot_params_kdebugfs_init();#endif 	return error;}arch_initcall(arch_kdebugfs_init);