summaryrefslogtreecommitdiffstats
path: root/arch/sh/mm/cache-debugfs.c
blob: 4eb9d43578b4c3ead533bcae6030ec4ead92ce95 (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
/*
 * debugfs ops for the L1 cache
 *
 *  Copyright (C) 2006  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <asm/cache.h>
#include <asm/io.h>

enum cache_type {
	CACHE_TYPE_ICACHE,
	CACHE_TYPE_DCACHE,
	CACHE_TYPE_UNIFIED,
};

static int cache_seq_show(struct seq_file *file, void *iter)
{
	unsigned int cache_type = (unsigned int)file->private;
	struct cache_info *cache;
	unsigned int waysize, way;
	unsigned long ccr;
	unsigned long addrstart = 0;

	/*
	 * Go uncached immediately so we don't skew the results any
	 * more than we already are..
	 */
	jump_to_uncached();

	ccr = __raw_readl(SH_CCR);
	if ((ccr & CCR_CACHE_ENABLE) == 0) {
		back_to_cached();

		seq_printf(file, "disabled\n");
		return 0;
	}

	if (cache_type == CACHE_TYPE_DCACHE) {
		addrstart = CACHE_OC_ADDRESS_ARRAY;
		cache = &current_cpu_data.dcache;
	} else {
		addrstart = CACHE_IC_ADDRESS_ARRAY;
		cache = &current_cpu_data.icache;
	}

	waysize = cache->sets;

	/*
	 * If the OC is already in RAM mode, we only have
	 * half of the entries to consider..
	 */
	if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)
		waysize >>= 1;

	waysize <<= cache->entry_shift;

	for (way = 0; way < cache->ways; way++) {
		unsigned long addr;
		unsigned int line;

		seq_printf(file, "-----------------------------------------\n");
		seq_printf(file, "Way %d\n", way);
		seq_printf(file, "-----------------------------------------\n");

		for (addr = addrstart, line = 0;
		     addr < addrstart + waysize;
		     addr += cache->linesz, line++) {
			unsigned long data = __raw_readl(addr);

			/* Check the V bit, ignore invalid cachelines */
			if ((data & 1) == 0)
				continue;

			/* U: Dirty, cache tag is 10 bits up */
			seq_printf(file, "%3d: %c 0x%lx\n",
				   line, data & 2 ? 'U' : ' ',
				   data & 0x1ffffc00);
		}

		addrstart += cache->way_incr;
	}

	back_to_cached();

	return 0;
}

static int cache_debugfs_open(struct inode *inode, struct file *file)
{
	return single_open(file, cache_seq_show, inode->i_private);
}

static const struct file_operations cache_debugfs_fops = {
	.owner		= THIS_MODULE,
	.open		= cache_debugfs_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int __init cache_debugfs_init(void)
{
	struct dentry *dcache_dentry, *icache_dentry;

	dcache_dentry = debugfs_create_file("dcache", S_IRUSR, arch_debugfs_dir,
					    (unsigned int *)CACHE_TYPE_DCACHE,
					    &cache_debugfs_fops);
	if (!dcache_dentry)
		return -ENOMEM;

	icache_dentry = debugfs_create_file("icache", S_IRUSR, arch_debugfs_dir,
					    (unsigned int *)CACHE_TYPE_ICACHE,
					    &cache_debugfs_fops);
	if (!icache_dentry) {
		debugfs_remove(dcache_dentry);
		return -ENOMEM;
	}

	return 0;
}
module_init(cache_debugfs_init);

MODULE_LICENSE("GPL v2");