| 1 | |
| 2 | * debugfs ops for the L1 cache
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| 3 | *
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| 4 | * Copyright (C) 2006 Paul Mundt
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| 5 | *
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| 6 | * This file is subject to the terms and conditions of the GNU General Public
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| 7 | * License. See the file "COPYING" in the main directory of this archive
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| 8 | * for more details.
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| 9 |
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| 10 | #include <linux/init.h>
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| 11 | #include <linux/module.h>
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| 12 | #include <linux/debugfs.h>
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| 13 | #include <linux/seq_file.h>
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| 14 | #include <asm/processor.h>
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| 15 | #include <linux/uaccess.h>
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| 16 | #include <asm/cache.h>
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| 17 | #include <asm/io.h>
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| 18 |
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| 19 | enum cache_type {
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| 20 | CACHE_TYPE_ICACHE,
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| 21 | CACHE_TYPE_DCACHE,
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| 22 | CACHE_TYPE_UNIFIED,
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| 23 | };
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| 24 |
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| 25 | static int cache_debugfs_show(struct seq_file *file, void *iter)
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| 26 | {
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| 27 | unsigned int cache_type = (unsigned int)file->private;
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| 28 | struct cache_info *cache;
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| 29 | unsigned int waysize, way;
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| 30 | unsigned long ccr;
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| 31 | unsigned long addrstart = 0;
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| 32 |
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| 33 | |
| 34 | * Go uncached immediately so we don't skew the results any
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| 35 | * more than we already are..
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| 36 |
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| 37 | jump_to_uncached();
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| 38 |
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| 39 | ccr = __raw_readl(SH_CCR);
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| 40 | if ((ccr & CCR_CACHE_ENABLE) == 0) {
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| 41 | back_to_cached();
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| 42 |
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| 43 | seq_printf(file, "disabled\n");
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| 44 | return 0;
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| 45 | }
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| 46 |
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| 47 | if (cache_type == CACHE_TYPE_DCACHE) {
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| 48 | addrstart = CACHE_OC_ADDRESS_ARRAY;
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| 49 | cache = ¤t_cpu_data.dcache;
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| 50 | } else {
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| 51 | addrstart = CACHE_IC_ADDRESS_ARRAY;
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| 52 | cache = ¤t_cpu_data.icache;
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| 53 | }
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| 54 |
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| 55 | waysize = cache->sets;
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| 56 |
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| 57 | |
| 58 | * If the OC is already in RAM mode, we only have
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| 59 | * half of the entries to consider..
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| 60 |
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| 61 | if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)
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| 62 | waysize >>= 1;
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| 63 |
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| 64 | waysize <<= cache->entry_shift;
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| 65 |
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| 66 | for (way = 0; way < cache->ways; way++) {
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| 67 | unsigned long addr;
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| 68 | unsigned int line;
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| 69 |
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| 70 | seq_printf(file, "-----------------------------------------\n");
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| 71 | seq_printf(file, "Way %d\n", way);
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| 72 | seq_printf(file, "-----------------------------------------\n");
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| 73 |
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| 74 | for (addr = addrstart, line = 0;
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| 75 | addr < addrstart + waysize;
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| 76 | addr += cache->linesz, line++) {
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| 77 | unsigned long data = __raw_readl(addr);
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| 78 |
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| 79 |
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| 80 | if ((data & 1) == 0)
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| 81 | continue;
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| 82 |
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| 83 |
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| 84 | seq_printf(file, "%3d: %c 0x%lx\n",
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| 85 | line, data & 2 ? 'U' : ' ',
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| 86 | data & 0x1ffffc00);
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| 87 | }
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| 88 |
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| 89 | addrstart += cache->way_incr;
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| 90 | }
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| 91 |
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| 92 | back_to_cached();
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| 93 |
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| 94 | return 0;
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| 95 | }
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| 96 |
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| 97 | DEFINE_SHOW_ATTRIBUTE(cache_debugfs);
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| 98 |
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| 99 | static int __init cache_debugfs_init(void)
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| 100 | {
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| 101 | debugfs_create_file("dcache", S_IRUSR, arch_debugfs_dir,
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| 102 | (void *)CACHE_TYPE_DCACHE, &cache_debugfs_fops);
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| 103 | debugfs_create_file("icache", S_IRUSR, arch_debugfs_dir,
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| 104 | (void *)CACHE_TYPE_ICACHE, &cache_debugfs_fops);
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| 105 | return 0;
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| 106 | }
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| 107 | module_init(cache_debugfs_init);
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| 108 |
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| 109 | MODULE_LICENSE("GPL v2");
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