arch/sh/mm/cache-debugfs.c

   1 /*
   2  * debugfs ops for the L1 cache
   3  *
   4  *  Copyright (C) 2006  Paul Mundt
   5  *
   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
   8  * for more details.
   9  */
  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 <linux/uaccess.h>
  16 #include <asm/cache.h>
  17 #include <asm/io.h>
  18
  19 enum cache_type {
  20         CACHE_TYPE_ICACHE,
  21         CACHE_TYPE_DCACHE,
  22         CACHE_TYPE_UNIFIED,
  23 };
  24
  25 static int cache_seq_show(struct seq_file *file, void *iter)
  26 {
  27         unsigned int cache_type = (unsigned int)file->private;
  28         struct cache_info *cache;
  29         unsigned int waysize, way;
  30         unsigned long ccr;
  31         unsigned long addrstart = 0;
  32
  33         /*
  34          * Go uncached immediately so we don't skew the results any
  35          * more than we already are..
  36          */
  37         jump_to_uncached();
  38
  39         ccr = __raw_readl(SH_CCR);
  40         if ((ccr & CCR_CACHE_ENABLE) == 0) {
  41                 back_to_cached();
  42
  43                 seq_printf(file, "disabled\n");
  44                 return 0;
  45         }
  46
  47         if (cache_type == CACHE_TYPE_DCACHE) {
  48                 addrstart = CACHE_OC_ADDRESS_ARRAY;
  49                 cache = &current_cpu_data.dcache;
  50         } else {
  51                 addrstart = CACHE_IC_ADDRESS_ARRAY;
  52                 cache = &current_cpu_data.icache;
  53         }
  54
  55         waysize = cache->sets;
  56
  57         /*
  58          * If the OC is already in RAM mode, we only have
  59          * half of the entries to consider..
  60          */
  61         if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)
  62                 waysize >>= 1;
  63
  64         waysize <<= cache->entry_shift;
  65
  66         for (way = 0; way < cache->ways; way++) {
  67                 unsigned long addr;
  68                 unsigned int line;
  69
  70                 seq_printf(file, "-----------------------------------------\n");
  71                 seq_printf(file, "Way %d\n", way);
  72                 seq_printf(file, "-----------------------------------------\n");
  73
  74                 for (addr = addrstart, line = 0;
  75                      addr < addrstart + waysize;
  76                      addr += cache->linesz, line++) {
  77                         unsigned long data = __raw_readl(addr);
  78
  79                         /* Check the V bit, ignore invalid cachelines */
  80                         if ((data & 1) == 0)
  81                                 continue;
  82
  83                         /* U: Dirty, cache tag is 10 bits up */
  84                         seq_printf(file, "%3d: %c 0x%lx\n",
  85                                    line, data & 2 ? 'U' : ' ',
  86                                    data & 0x1ffffc00);
  87                 }
  88
  89                 addrstart += cache->way_incr;
  90         }
  91
  92         back_to_cached();
  93
  94         return 0;
  95 }
  96
  97 static int cache_debugfs_open(struct inode *inode, struct file *file)
  98 {
  99         return single_open(file, cache_seq_show, inode->i_private);
 100 }
 101
 102 static const struct file_operations cache_debugfs_fops = {
 103         .owner          = THIS_MODULE,
 104         .open           = cache_debugfs_open,
 105         .read           = seq_read,
 106         .llseek         = seq_lseek,
 107         .release        = single_release,
 108 };
 109
 110 static int __init cache_debugfs_init(void)
 111 {
 112         struct dentry *dcache_dentry, *icache_dentry;
 113
 114         dcache_dentry = debugfs_create_file("dcache", S_IRUSR, arch_debugfs_dir,
 115                                             (unsigned int *)CACHE_TYPE_DCACHE,
 116                                             &cache_debugfs_fops);
 117         if (!dcache_dentry)
 118                 return -ENOMEM;
 119
 120         icache_dentry = debugfs_create_file("icache", S_IRUSR, arch_debugfs_dir,
 121                                             (unsigned int *)CACHE_TYPE_ICACHE,
 122                                             &cache_debugfs_fops);
 123         if (!icache_dentry) {
 124                 debugfs_remove(dcache_dentry);
 125                 return -ENOMEM;
 126         }
 127
 128         return 0;
 129 }
 130 module_init(cache_debugfs_init);
 131
 132 MODULE_LICENSE("GPL v2");