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298c48a811
This patch fixes a icache/dcache address-array start address while dumping its entires in debugfs. Perviously the code was attempting to remember the address in static variable, which is no more required for debugfs, as the function can be executed in one pass. Without this patch the start address ends up in wrong place and the /sys/kernel/debug/sh/icache or dcache debugfs contents may not be correct. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com> Cc: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
132 lines
3 KiB
C
132 lines
3 KiB
C
/*
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* debugfs ops for the L1 cache
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*
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* Copyright (C) 2006 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <asm/processor.h>
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#include <asm/uaccess.h>
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#include <asm/cache.h>
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#include <asm/io.h>
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enum cache_type {
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CACHE_TYPE_ICACHE,
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CACHE_TYPE_DCACHE,
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CACHE_TYPE_UNIFIED,
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};
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static int cache_seq_show(struct seq_file *file, void *iter)
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{
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unsigned int cache_type = (unsigned int)file->private;
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struct cache_info *cache;
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unsigned int waysize, way;
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unsigned long ccr;
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unsigned long addrstart = 0;
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/*
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* Go uncached immediately so we don't skew the results any
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* more than we already are..
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*/
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jump_to_uncached();
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ccr = __raw_readl(CCR);
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if ((ccr & CCR_CACHE_ENABLE) == 0) {
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back_to_cached();
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seq_printf(file, "disabled\n");
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return 0;
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}
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if (cache_type == CACHE_TYPE_DCACHE) {
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addrstart = CACHE_OC_ADDRESS_ARRAY;
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cache = ¤t_cpu_data.dcache;
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} else {
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addrstart = CACHE_IC_ADDRESS_ARRAY;
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cache = ¤t_cpu_data.icache;
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}
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waysize = cache->sets;
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/*
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* If the OC is already in RAM mode, we only have
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* half of the entries to consider..
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*/
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if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)
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waysize >>= 1;
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waysize <<= cache->entry_shift;
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for (way = 0; way < cache->ways; way++) {
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unsigned long addr;
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unsigned int line;
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seq_printf(file, "-----------------------------------------\n");
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seq_printf(file, "Way %d\n", way);
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seq_printf(file, "-----------------------------------------\n");
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for (addr = addrstart, line = 0;
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addr < addrstart + waysize;
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addr += cache->linesz, line++) {
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unsigned long data = __raw_readl(addr);
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/* Check the V bit, ignore invalid cachelines */
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if ((data & 1) == 0)
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continue;
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/* U: Dirty, cache tag is 10 bits up */
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seq_printf(file, "%3d: %c 0x%lx\n",
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line, data & 2 ? 'U' : ' ',
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data & 0x1ffffc00);
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}
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addrstart += cache->way_incr;
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}
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back_to_cached();
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return 0;
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}
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static int cache_debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, cache_seq_show, inode->i_private);
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}
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static const struct file_operations cache_debugfs_fops = {
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.owner = THIS_MODULE,
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.open = cache_debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init cache_debugfs_init(void)
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{
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struct dentry *dcache_dentry, *icache_dentry;
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dcache_dentry = debugfs_create_file("dcache", S_IRUSR, arch_debugfs_dir,
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(unsigned int *)CACHE_TYPE_DCACHE,
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&cache_debugfs_fops);
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if (!dcache_dentry)
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return -ENOMEM;
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icache_dentry = debugfs_create_file("icache", S_IRUSR, arch_debugfs_dir,
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(unsigned int *)CACHE_TYPE_ICACHE,
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&cache_debugfs_fops);
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if (!icache_dentry) {
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debugfs_remove(dcache_dentry);
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return -ENOMEM;
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}
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return 0;
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}
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module_init(cache_debugfs_init);
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MODULE_LICENSE("GPL v2");
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