v4.19.13 snapshot.
diff --git a/arch/sh/mm/cache-debugfs.c b/arch/sh/mm/cache-debugfs.c
new file mode 100644
index 0000000..4eb9d43
--- /dev/null
+++ b/arch/sh/mm/cache-debugfs.c
@@ -0,0 +1,132 @@
+/*
+ * 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 = ¤t_cpu_data.dcache;
+ } else {
+ addrstart = CACHE_IC_ADDRESS_ARRAY;
+ cache = ¤t_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");