summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/iommu/omap-iommu-debug.c
blob: f3d20a2039d20417093fd70c6192b905e7c3ccf8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/*
 * omap iommu: debugfs interface
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include <linux/platform_data/iommu-omap.h>

#include "omap-iopgtable.h"
#include "omap-iommu.h"

static DEFINE_MUTEX(iommu_debug_lock);

static struct dentry *iommu_debug_root;

static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
{
	return !obj->domain;
}

static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
			       size_t count, loff_t *ppos)
{
	struct omap_iommu *obj = file->private_data;
	char *p, *buf;
	ssize_t bytes;

	if (is_omap_iommu_detached(obj))
		return -EPERM;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	p = buf;

	mutex_lock(&iommu_debug_lock);

	bytes = omap_iommu_dump_ctx(obj, p, count);
	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);

	mutex_unlock(&iommu_debug_lock);
	kfree(buf);

	return bytes;
}

static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
			      size_t count, loff_t *ppos)
{
	struct omap_iommu *obj = file->private_data;
	char *p, *buf;
	ssize_t bytes, rest;

	if (is_omap_iommu_detached(obj))
		return -EPERM;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;
	p = buf;

	mutex_lock(&iommu_debug_lock);

	p += sprintf(p, "%8s %8s\n", "cam:", "ram:");
	p += sprintf(p, "-----------------------------------------\n");
	rest = count - (p - buf);
	p += omap_dump_tlb_entries(obj, p, rest);

	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);

	mutex_unlock(&iommu_debug_lock);
	kfree(buf);

	return bytes;
}

static void dump_ioptable(struct seq_file *s)
{
	int i, j;
	u32 da;
	u32 *iopgd, *iopte;
	struct omap_iommu *obj = s->private;

	spin_lock(&obj->page_table_lock);

	iopgd = iopgd_offset(obj, 0);
	for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {
		if (!*iopgd)
			continue;

		if (!(*iopgd & IOPGD_TABLE)) {
			da = i << IOPGD_SHIFT;
			seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);
			continue;
		}

		iopte = iopte_offset(iopgd, 0);
		for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {
			if (!*iopte)
				continue;

			da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);
			seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);
		}
	}

	spin_unlock(&obj->page_table_lock);
}

static int debug_read_pagetable(struct seq_file *s, void *data)
{
	struct omap_iommu *obj = s->private;

	if (is_omap_iommu_detached(obj))
		return -EPERM;

	mutex_lock(&iommu_debug_lock);

	seq_printf(s, "L: %8s %8s\n", "da:", "pte:");
	seq_puts(s, "--------------------------\n");
	dump_ioptable(s);

	mutex_unlock(&iommu_debug_lock);

	return 0;
}

#define DEBUG_SEQ_FOPS_RO(name)						       \
	static int debug_open_##name(struct inode *inode, struct file *file)   \
	{								       \
		return single_open(file, debug_read_##name, inode->i_private); \
	}								       \
									       \
	static const struct file_operations debug_##name##_fops = {	       \
		.open		= debug_open_##name,			       \
		.read		= seq_read,				       \
		.llseek		= seq_lseek,				       \
		.release	= single_release,			       \
	}

#define DEBUG_FOPS_RO(name)						\
	static const struct file_operations debug_##name##_fops = {	\
		.open = simple_open,					\
		.read = debug_read_##name,				\
		.llseek = generic_file_llseek,				\
	};

DEBUG_FOPS_RO(regs);
DEBUG_FOPS_RO(tlb);
DEBUG_SEQ_FOPS_RO(pagetable);

#define __DEBUG_ADD_FILE(attr, mode)					\
	{								\
		struct dentry *dent;					\
		dent = debugfs_create_file(#attr, mode, obj->debug_dir,	\
					   obj, &debug_##attr##_fops);	\
		if (!dent)						\
			goto err;					\
	}

#define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)

void omap_iommu_debugfs_add(struct omap_iommu *obj)
{
	struct dentry *d;

	if (!iommu_debug_root)
		return;

	obj->debug_dir = debugfs_create_dir(obj->name, iommu_debug_root);
	if (!obj->debug_dir)
		return;

	d = debugfs_create_u8("nr_tlb_entries", 0400, obj->debug_dir,
			      (u8 *)&obj->nr_tlb_entries);
	if (!d)
		return;

	DEBUG_ADD_FILE_RO(regs);
	DEBUG_ADD_FILE_RO(tlb);
	DEBUG_ADD_FILE_RO(pagetable);

	return;

err:
	debugfs_remove_recursive(obj->debug_dir);
}

void omap_iommu_debugfs_remove(struct omap_iommu *obj)
{
	if (!obj->debug_dir)
		return;

	debugfs_remove_recursive(obj->debug_dir);
}

void __init omap_iommu_debugfs_init(void)
{
	iommu_debug_root = debugfs_create_dir("omap_iommu", NULL);
	if (!iommu_debug_root)
		pr_err("can't create debugfs dir\n");
}

void __exit omap_iommu_debugfs_exit(void)
{
	debugfs_remove(iommu_debug_root);
}