[mirror_ubuntu-artful-kernel.git] / arch / x86 / kernel / kdebugfs.c

/*
 * 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/export.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_PARAMS
struct 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 __init
create_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", arch_debugfs_dir);
	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);
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>
186f4360	11	#include <linux/export.h>
5a0e3ad6	12	#include <linux/slab.h>
6d7d7433	13	#include <linux/init.h>
390cd85c	14	#include <linux/stat.h>
c14b2adf HY	15	#include <linux/io.h>
c14b2adf HY	16	#include <linux/mm.h>
6d7d7433 HY	17
	18	#include <asm/setup.h>
	19
ae79cdaa	20	struct dentry *arch_debugfs_dir;
	21	EXPORT_SYMBOL(arch_debugfs_dir);
	22
6d7d7433	23	#ifdef CONFIG_DEBUG_BOOT_PARAMS
c14b2adf HY	24	struct setup_data_node {
	25	u64 paddr;
	26	u32 type;
	27	u32 len;
	28	};
	29
390cd85c JSR	30	static ssize_t setup_data_read(struct file file, char __user user_buf,
390cd85c JSR	31	size_t count, loff_t *ppos)
c14b2adf HY	32	{
	33	struct setup_data_node *node = file->private_data;
	34	unsigned long remain;
	35	loff_t pos = *ppos;
	36	struct page *pg;
	37	void *p;
	38	u64 pa;
	39
	40	if (pos < 0)
	41	return -EINVAL;
390cd85c	42
c14b2adf HY	43	if (pos >= node->len)
	44	return 0;
	45
	46	if (count > node->len - pos)
	47	count = node->len - pos;
390cd85c	48
c14b2adf HY	49	pa = node->paddr + sizeof(struct setup_data) + pos;
	50	pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT);
	51	if (PageHighMem(pg)) {
	52	p = ioremap_cache(pa, count);
	53	if (!p)
	54	return -ENXIO;
390cd85c	55	} else
c14b2adf	56	p = __va(pa);
c14b2adf HY	57
	58	remain = copy_to_user(user_buf, p, count);
	59
	60	if (PageHighMem(pg))
	61	iounmap(p);
	62
	63	if (remain)
	64	return -EFAULT;
	65
	66	*ppos = pos + count;
	67
	68	return count;
	69	}
	70
c14b2adf	71	static const struct file_operations fops_setup_data = {
390cd85c	72	.read = setup_data_read,
234e3405	73	.open = simple_open,
6038f373	74	.llseek = default_llseek,
c14b2adf HY	75	};
	76
	77	static int __init
	78	create_setup_data_node(struct dentry *parent, int no,
	79	struct setup_data_node *node)
	80	{
	81	struct dentry d, type, *data;
	82	char buf[16];
c14b2adf HY	83
	84	sprintf(buf, "%d", no);
	85	d = debugfs_create_dir(buf, parent);
390cd85c JSR	86	if (!d)
	87	return -ENOMEM;
	88
c14b2adf	89	type = debugfs_create_x32("type", S_IRUGO, d, &node->type);
390cd85c	90	if (!type)
c14b2adf	91	goto err_dir;
390cd85c	92
c14b2adf	93	data = debugfs_create_file("data", S_IRUGO, d, node, &fops_setup_data);
390cd85c	94	if (!data)
c14b2adf	95	goto err_type;
390cd85c	96
c14b2adf HY	97	return 0;
	98
	99	err_type:
	100	debugfs_remove(type);
	101	err_dir:
	102	debugfs_remove(d);
390cd85c	103	return -ENOMEM;
c14b2adf HY	104	}
	105
	106	static int __init create_setup_data_nodes(struct dentry *parent)
	107	{
	108	struct setup_data_node *node;
	109	struct setup_data *data;
41fb433b	110	int error;
c14b2adf HY	111	struct dentry *d;
	112	struct page *pg;
	113	u64 pa_data;
390cd85c	114	int no = 0;
c14b2adf HY	115
c14b2adf HY	116	d = debugfs_create_dir("setup_data", parent);
390cd85c JSR	117	if (!d)
390cd85c JSR	118	return -ENOMEM;
c14b2adf HY	119
	120	pa_data = boot_params.hdr.setup_data;
	121
	122	while (pa_data) {
	123	node = kmalloc(sizeof(*node), GFP_KERNEL);
41fb433b JL	124	if (!node) {
41fb433b JL	125	error = -ENOMEM;
c14b2adf	126	goto err_dir;
41fb433b	127	}
390cd85c	128
c14b2adf HY	129	pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT);
	130	if (PageHighMem(pg)) {
	131	data = ioremap_cache(pa_data, sizeof(*data));
	132	if (!data) {
f461a1d8	133	kfree(node);
c14b2adf HY	134	error = -ENXIO;
	135	goto err_dir;
	136	}
390cd85c	137	} else
c14b2adf	138	data = __va(pa_data);
c14b2adf HY	139
	140	node->paddr = pa_data;
	141	node->type = data->type;
	142	node->len = data->len;
	143	error = create_setup_data_node(d, no, node);
	144	pa_data = data->next;
	145
	146	if (PageHighMem(pg))
	147	iounmap(data);
	148	if (error)
	149	goto err_dir;
	150	no++;
	151	}
390cd85c	152
c14b2adf HY	153	return 0;
	154
	155	err_dir:
	156	debugfs_remove(d);
c14b2adf HY	157	return error;
	158	}
	159
6d7d7433	160	static struct debugfs_blob_wrapper boot_params_blob = {
c14b2adf HY	161	.data = &boot_params,
c14b2adf HY	162	.size = sizeof(boot_params),
6d7d7433 HY	163	};
	164
	165	static int __init boot_params_kdebugfs_init(void)
	166	{
6d7d7433	167	struct dentry dbp, version, *data;
390cd85c	168	int error = -ENOMEM;
6d7d7433	169
10bce841	170	dbp = debugfs_create_dir("boot_params", arch_debugfs_dir);
390cd85c JSR	171	if (!dbp)
	172	return -ENOMEM;
	173
6d7d7433 HY	174	version = debugfs_create_x16("version", S_IRUGO, dbp,
6d7d7433 HY	175	&boot_params.hdr.version);
390cd85c	176	if (!version)
6d7d7433	177	goto err_dir;
390cd85c	178
6d7d7433 HY	179	data = debugfs_create_blob("data", S_IRUGO, dbp,
6d7d7433 HY	180	&boot_params_blob);
390cd85c	181	if (!data)
6d7d7433	182	goto err_version;
390cd85c	183
c14b2adf HY	184	error = create_setup_data_nodes(dbp);
	185	if (error)
	186	goto err_data;
390cd85c	187
6d7d7433	188	return 0;
c14b2adf HY	189
	190	err_data:
	191	debugfs_remove(data);
6d7d7433 HY	192	err_version:
	193	debugfs_remove(version);
	194	err_dir:
	195	debugfs_remove(dbp);
6d7d7433 HY	196	return error;
6d7d7433 HY	197	}
390cd85c	198	#endif /* CONFIG_DEBUG_BOOT_PARAMS */
6d7d7433 HY	199
	200	static int __init arch_kdebugfs_init(void)
	201	{
	202	int error = 0;
	203
ae79cdaa	204	arch_debugfs_dir = debugfs_create_dir("x86", NULL);
	205	if (!arch_debugfs_dir)
	206	return -ENOMEM;
	207
6d7d7433 HY	208	#ifdef CONFIG_DEBUG_BOOT_PARAMS
	209	error = boot_params_kdebugfs_init();
	210	#endif
	211
	212	return error;
	213	}
6d7d7433	214	arch_initcall(arch_kdebugfs_init);