2 * debugfs ops for the L1 cache
4 * Copyright (C) 2006 Paul Mundt
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/debugfs.h>
13 #include <linux/seq_file.h>
14 #include <asm/processor.h>
15 #include <asm/uaccess.h>
16 #include <asm/cache.h>
25 static int cache_seq_show(struct seq_file *file, void *iter)
27 unsigned int cache_type = (unsigned int)file->private;
28 struct cache_info *cache;
29 unsigned int waysize, way, cache_size;
30 unsigned long ccr, base;
31 static unsigned long addrstart = 0;
34 * Go uncached immediately so we don't skew the results any
35 * more than we already are..
40 if ((ccr & CCR_CACHE_ENABLE) == 0) {
43 seq_printf(file, "disabled\n");
47 if (cache_type == CACHE_TYPE_DCACHE) {
48 base = CACHE_OC_ADDRESS_ARRAY;
49 cache = ¤t_cpu_data.dcache;
51 base = CACHE_IC_ADDRESS_ARRAY;
52 cache = ¤t_cpu_data.icache;
56 * Due to the amount of data written out (depending on the cache size),
57 * we may be iterated over multiple times. In this case, keep track of
58 * the entry position in addrstart, and rewind it when we've hit the
61 * Likewise, the same code is used for multiple caches, so care must
62 * be taken for bouncing addrstart back and forth so the appropriate
65 cache_size = cache->ways * cache->sets * cache->linesz;
66 if (((addrstart & 0xff000000) != base) ||
67 (addrstart & 0x00ffffff) > cache_size)
70 waysize = cache->sets;
73 * If the OC is already in RAM mode, we only have
74 * half of the entries to consider..
76 if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)
79 waysize <<= cache->entry_shift;
81 for (way = 0; way < cache->ways; way++) {
85 seq_printf(file, "-----------------------------------------\n");
86 seq_printf(file, "Way %d\n", way);
87 seq_printf(file, "-----------------------------------------\n");
89 for (addr = addrstart, line = 0;
90 addr < addrstart + waysize;
91 addr += cache->linesz, line++) {
92 unsigned long data = ctrl_inl(addr);
94 /* Check the V bit, ignore invalid cachelines */
98 /* U: Dirty, cache tag is 10 bits up */
99 seq_printf(file, "%3d: %c 0x%lx\n",
100 line, data & 2 ? 'U' : ' ',
104 addrstart += cache->way_incr;
112 static int cache_debugfs_open(struct inode *inode, struct file *file)
114 return single_open(file, cache_seq_show, inode->i_private);
117 static const struct file_operations cache_debugfs_fops = {
118 .owner = THIS_MODULE,
119 .open = cache_debugfs_open,
122 .release = seq_release,
125 static int __init cache_debugfs_init(void)
127 struct dentry *dcache_dentry, *icache_dentry;
129 dcache_dentry = debugfs_create_file("dcache", S_IRUSR, NULL,
130 (unsigned int *)CACHE_TYPE_DCACHE,
131 &cache_debugfs_fops);
132 if (IS_ERR(dcache_dentry))
133 return PTR_ERR(dcache_dentry);
135 icache_dentry = debugfs_create_file("icache", S_IRUSR, NULL,
136 (unsigned int *)CACHE_TYPE_ICACHE,
137 &cache_debugfs_fops);
138 if (IS_ERR(icache_dentry)) {
139 debugfs_remove(dcache_dentry);
140 return PTR_ERR(icache_dentry);
145 module_init(cache_debugfs_init);
147 MODULE_LICENSE("GPL v2");