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Linux/arch/sh/mm/cache-debugfs.c

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  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 <asm/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(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");
133 

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