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6ae66502 MF |
1 | /* |
2 | * arch/sh/mm/tlb-debugfs.c | |
3 | * | |
4 | * debugfs ops for SH-4 ITLB/UTLBs. | |
5 | * | |
6 | * Copyright (C) 2010 Matt Fleming | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General Public | |
9 | * License. See the file "COPYING" in the main directory of this archive | |
10 | * for more details. | |
11 | */ | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/debugfs.h> | |
15 | #include <linux/seq_file.h> | |
16 | #include <asm/processor.h> | |
17 | #include <asm/mmu_context.h> | |
18 | #include <asm/tlbflush.h> | |
19 | ||
20 | enum tlb_type { | |
21 | TLB_TYPE_ITLB, | |
22 | TLB_TYPE_UTLB, | |
23 | }; | |
24 | ||
25 | static struct { | |
26 | int bits; | |
27 | const char *size; | |
28 | } tlb_sizes[] = { | |
29 | { 0x0, " 1KB" }, | |
30 | { 0x1, " 4KB" }, | |
31 | { 0x2, " 8KB" }, | |
32 | { 0x4, " 64KB" }, | |
33 | { 0x5, "256KB" }, | |
34 | { 0x7, " 1MB" }, | |
35 | { 0x8, " 4MB" }, | |
36 | { 0xc, " 64MB" }, | |
37 | }; | |
38 | ||
39 | static int tlb_seq_show(struct seq_file *file, void *iter) | |
40 | { | |
41 | unsigned int tlb_type = (unsigned int)file->private; | |
42 | unsigned long addr1, addr2, data1, data2; | |
43 | unsigned long flags; | |
44 | unsigned long mmucr; | |
45 | unsigned int nentries, entry; | |
46 | unsigned int urb; | |
47 | ||
48 | mmucr = __raw_readl(MMUCR); | |
49 | if ((mmucr & 0x1) == 0) { | |
50 | seq_printf(file, "address translation disabled\n"); | |
51 | return 0; | |
52 | } | |
53 | ||
54 | if (tlb_type == TLB_TYPE_ITLB) { | |
55 | addr1 = MMU_ITLB_ADDRESS_ARRAY; | |
56 | addr2 = MMU_ITLB_ADDRESS_ARRAY2; | |
57 | data1 = MMU_ITLB_DATA_ARRAY; | |
58 | data2 = MMU_ITLB_DATA_ARRAY2; | |
59 | nentries = 4; | |
60 | } else { | |
61 | addr1 = MMU_UTLB_ADDRESS_ARRAY; | |
62 | addr2 = MMU_UTLB_ADDRESS_ARRAY2; | |
63 | data1 = MMU_UTLB_DATA_ARRAY; | |
64 | data2 = MMU_UTLB_DATA_ARRAY2; | |
65 | nentries = 64; | |
66 | } | |
67 | ||
68 | local_irq_save(flags); | |
69 | jump_to_uncached(); | |
70 | ||
71 | urb = (mmucr & MMUCR_URB) >> MMUCR_URB_SHIFT; | |
72 | ||
73 | /* Make the "entry >= urb" test fail. */ | |
74 | if (urb == 0) | |
75 | urb = MMUCR_URB_NENTRIES + 1; | |
76 | ||
77 | if (tlb_type == TLB_TYPE_ITLB) { | |
78 | addr1 = MMU_ITLB_ADDRESS_ARRAY; | |
79 | addr2 = MMU_ITLB_ADDRESS_ARRAY2; | |
80 | data1 = MMU_ITLB_DATA_ARRAY; | |
81 | data2 = MMU_ITLB_DATA_ARRAY2; | |
82 | nentries = 4; | |
83 | } else { | |
84 | addr1 = MMU_UTLB_ADDRESS_ARRAY; | |
85 | addr2 = MMU_UTLB_ADDRESS_ARRAY2; | |
86 | data1 = MMU_UTLB_DATA_ARRAY; | |
87 | data2 = MMU_UTLB_DATA_ARRAY2; | |
88 | nentries = 64; | |
89 | } | |
90 | ||
91 | seq_printf(file, "entry: vpn ppn asid size valid wired\n"); | |
92 | ||
93 | for (entry = 0; entry < nentries; entry++) { | |
94 | unsigned long vpn, ppn, asid, size; | |
95 | unsigned long valid; | |
96 | unsigned long val; | |
97 | const char *sz = " ?"; | |
98 | int i; | |
99 | ||
100 | val = __raw_readl(addr1 | (entry << MMU_TLB_ENTRY_SHIFT)); | |
101 | ctrl_barrier(); | |
102 | vpn = val & 0xfffffc00; | |
103 | valid = val & 0x100; | |
104 | ||
105 | val = __raw_readl(addr2 | (entry << MMU_TLB_ENTRY_SHIFT)); | |
106 | ctrl_barrier(); | |
107 | asid = val & MMU_CONTEXT_ASID_MASK; | |
108 | ||
109 | val = __raw_readl(data1 | (entry << MMU_TLB_ENTRY_SHIFT)); | |
110 | ctrl_barrier(); | |
111 | ppn = (val & 0x0ffffc00) << 4; | |
112 | ||
113 | val = __raw_readl(data2 | (entry << MMU_TLB_ENTRY_SHIFT)); | |
114 | ctrl_barrier(); | |
115 | size = (val & 0xf0) >> 4; | |
116 | ||
117 | for (i = 0; i < ARRAY_SIZE(tlb_sizes); i++) { | |
118 | if (tlb_sizes[i].bits == size) | |
119 | break; | |
120 | } | |
121 | ||
122 | if (i != ARRAY_SIZE(tlb_sizes)) | |
123 | sz = tlb_sizes[i].size; | |
124 | ||
125 | seq_printf(file, "%2d: 0x%08lx 0x%08lx %5lu %s %s %s\n", | |
126 | entry, vpn, ppn, asid, | |
127 | sz, valid ? "V" : "-", | |
128 | (urb <= entry) ? "W" : "-"); | |
129 | } | |
130 | ||
131 | back_to_cached(); | |
132 | local_irq_restore(flags); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int tlb_debugfs_open(struct inode *inode, struct file *file) | |
138 | { | |
139 | return single_open(file, tlb_seq_show, inode->i_private); | |
140 | } | |
141 | ||
142 | static const struct file_operations tlb_debugfs_fops = { | |
143 | .owner = THIS_MODULE, | |
144 | .open = tlb_debugfs_open, | |
145 | .read = seq_read, | |
146 | .llseek = seq_lseek, | |
147 | .release = single_release, | |
148 | }; | |
149 | ||
150 | static int __init tlb_debugfs_init(void) | |
151 | { | |
152 | struct dentry *itlb, *utlb; | |
153 | ||
154 | itlb = debugfs_create_file("itlb", S_IRUSR, sh_debugfs_root, | |
155 | (unsigned int *)TLB_TYPE_ITLB, | |
156 | &tlb_debugfs_fops); | |
157 | if (unlikely(!itlb)) | |
158 | return -ENOMEM; | |
159 | if (IS_ERR(itlb)) | |
160 | return PTR_ERR(itlb); | |
161 | ||
162 | utlb = debugfs_create_file("utlb", S_IRUSR, sh_debugfs_root, | |
163 | (unsigned int *)TLB_TYPE_UTLB, | |
164 | &tlb_debugfs_fops); | |
165 | if (unlikely(!utlb)) { | |
166 | debugfs_remove(itlb); | |
167 | return -ENOMEM; | |
168 | } | |
169 | ||
170 | if (IS_ERR(utlb)) { | |
171 | debugfs_remove(itlb); | |
172 | return PTR_ERR(utlb); | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | module_init(tlb_debugfs_init); | |
178 | ||
179 | MODULE_LICENSE("GPL v2"); |