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15f57a29 PM |
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, cache_size; | |
30 | unsigned long ccr, base; | |
31 | static 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_P2(); | |
38 | ||
39 | ccr = ctrl_inl(CCR); | |
40 | if ((ccr & CCR_CACHE_ENABLE) == 0) { | |
41 | back_to_P1(); | |
42 | ||
43 | seq_printf(file, "disabled\n"); | |
44 | return 0; | |
45 | } | |
46 | ||
47 | if (cache_type == CACHE_TYPE_DCACHE) { | |
48 | base = CACHE_OC_ADDRESS_ARRAY; | |
49 | cache = &cpu_data->dcache; | |
50 | } else { | |
51 | base = CACHE_IC_ADDRESS_ARRAY; | |
52 | cache = &cpu_data->icache; | |
53 | } | |
54 | ||
55 | /* | |
56 | * Due to the amount of data written out (depending on the cache size), | |
57 | * we may be iterated over multiple times. In this case, keep track of | |
58 | * the entry position in addrstart, and rewind it when we've hit the | |
59 | * end of the cache. | |
60 | * | |
61 | * Likewise, the same code is used for multiple caches, so care must | |
62 | * be taken for bouncing addrstart back and forth so the appropriate | |
63 | * cache is hit. | |
64 | */ | |
65 | cache_size = cache->ways * cache->sets * cache->linesz; | |
66 | if (((addrstart & 0xff000000) != base) || | |
67 | (addrstart & 0x00ffffff) > cache_size) | |
68 | addrstart = base; | |
69 | ||
70 | waysize = cache->sets; | |
71 | ||
72 | /* | |
73 | * If the OC is already in RAM mode, we only have | |
74 | * half of the entries to consider.. | |
75 | */ | |
76 | if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE) | |
77 | waysize >>= 1; | |
78 | ||
79 | waysize <<= cache->entry_shift; | |
80 | ||
81 | for (way = 0; way < cache->ways; way++) { | |
82 | unsigned long addr; | |
83 | unsigned int line; | |
84 | ||
85 | seq_printf(file, "-----------------------------------------\n"); | |
86 | seq_printf(file, "Way %d\n", way); | |
87 | seq_printf(file, "-----------------------------------------\n"); | |
88 | ||
89 | for (addr = addrstart, line = 0; | |
90 | addr < addrstart + waysize; | |
91 | addr += cache->linesz, line++) { | |
92 | unsigned long data = ctrl_inl(addr); | |
93 | ||
94 | /* Check the V bit, ignore invalid cachelines */ | |
95 | if ((data & 1) == 0) | |
96 | continue; | |
97 | ||
98 | /* U: Dirty, cache tag is 10 bits up */ | |
99 | seq_printf(file, "%3d: %c 0x%lx\n", | |
100 | line, data & 2 ? 'U' : ' ', | |
101 | data & 0x1ffffc00); | |
102 | } | |
103 | ||
104 | addrstart += cache->way_incr; | |
105 | } | |
106 | ||
107 | back_to_P1(); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | static int cache_debugfs_open(struct inode *inode, struct file *file) | |
113 | { | |
711fa809 | 114 | return single_open(file, cache_seq_show, inode->i_private); |
15f57a29 PM |
115 | } |
116 | ||
5dfe4c96 | 117 | static const struct file_operations cache_debugfs_fops = { |
15f57a29 PM |
118 | .owner = THIS_MODULE, |
119 | .open = cache_debugfs_open, | |
120 | .read = seq_read, | |
121 | .llseek = seq_lseek, | |
122 | .release = seq_release, | |
123 | }; | |
124 | ||
125 | static int __init cache_debugfs_init(void) | |
126 | { | |
127 | struct dentry *dcache_dentry, *icache_dentry; | |
128 | ||
129 | dcache_dentry = debugfs_create_file("dcache", S_IRUSR, NULL, | |
130 | (unsigned int *)CACHE_TYPE_DCACHE, | |
131 | &cache_debugfs_fops); | |
132 | if (IS_ERR(dcache_dentry)) | |
133 | return PTR_ERR(dcache_dentry); | |
134 | ||
135 | icache_dentry = debugfs_create_file("icache", S_IRUSR, NULL, | |
136 | (unsigned int *)CACHE_TYPE_ICACHE, | |
137 | &cache_debugfs_fops); | |
138 | if (IS_ERR(icache_dentry)) { | |
139 | debugfs_remove(dcache_dentry); | |
140 | return PTR_ERR(icache_dentry); | |
141 | } | |
142 | ||
143 | return 0; | |
144 | } | |
145 | module_init(cache_debugfs_init); | |
146 | ||
147 | MODULE_LICENSE("GPL v2"); |