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/*
* 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 <asm/uaccess.h>
#include <asm/cache.h>
#include <asm/io.h>
enum cache_type {
CACHE_TYPE_ICACHE,
CACHE_TYPE_DCACHE,
CACHE_TYPE_UNIFIED,
};
static int __uses_jump_to_uncached 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, cache_size;
unsigned long ccr, base;
static unsigned long addrstart = 0;
/*
* Go uncached immediately so we don't skew the results any
* more than we already are..
*/
jump_to_uncached();
ccr = ctrl_inl(CCR);
if ((ccr & CCR_CACHE_ENABLE) == 0) {
back_to_cached();
seq_printf(file, "disabled\n");
return 0;
}
if (cache_type == CACHE_TYPE_DCACHE) {
base = CACHE_OC_ADDRESS_ARRAY;
cache = ¤t_cpu_data.dcache;
} else {
base = CACHE_IC_ADDRESS_ARRAY;
cache = ¤t_cpu_data.icache;
}
/*
* Due to the amount of data written out (depending on the cache size),
* we may be iterated over multiple times. In this case, keep track of
* the entry position in addrstart, and rewind it when we've hit the
* end of the cache.
*
* Likewise, the same code is used for multiple caches, so care must
* be taken for bouncing addrstart back and forth so the appropriate
* cache is hit.
*/
cache_size = cache->ways * cache->sets * cache->linesz;
if (((addrstart & 0xff000000) != base) ||
(addrstart & 0x00ffffff) > cache_size)
addrstart = base;
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 = ctrl_inl(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 = seq_release,
};
static int __init cache_debugfs_init(void)
{
struct dentry *dcache_dentry, *icache_dentry;
dcache_dentry = debugfs_create_file("dcache", S_IRUSR, NULL,
(unsigned int *)CACHE_TYPE_DCACHE,
&cache_debugfs_fops);
if (IS_ERR(dcache_dentry))
return PTR_ERR(dcache_dentry);
icache_dentry = debugfs_create_file("icache", S_IRUSR, NULL,
(unsigned int *)CACHE_TYPE_ICACHE,
&cache_debugfs_fops);
if (IS_ERR(icache_dentry)) {
debugfs_remove(dcache_dentry);
return PTR_ERR(icache_dentry);
}
return 0;
}
module_init(cache_debugfs_init);
MODULE_LICENSE("GPL v2");
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