This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / sh / mm / cache-debugfs.c

diff --git a/arch/sh/mm/cache-debugfs.c b/arch/sh/mm/cache-debugfs.c
new file mode 100644 (file)
index 0000000..e0122bd
--- /dev/null
+++ b/arch/sh/mm/cache-debugfs.c
@@ -0,0 +1,147 @@
+/*
+ * 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 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_P2();
+
+       ccr = ctrl_inl(CCR);
+       if ((ccr & CCR_CACHE_ENABLE) == 0) {
+               back_to_P1();
+
+               seq_printf(file, "disabled\n");
+               return 0;
+       }
+
+       if (cache_type == CACHE_TYPE_DCACHE) {
+               base = CACHE_OC_ADDRESS_ARRAY;
+               cache = &cpu_data->dcache;
+       } else {
+               base = CACHE_IC_ADDRESS_ARRAY;
+               cache = &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_P1();
+
+       return 0;
+}
+
+static int cache_debugfs_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, cache_seq_show, inode->i_private);
+}
+
+static 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");