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(m: file, fmt: "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(m: file, fmt: "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(m: file, fmt: "%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 | debugfs_create_file(name: "itlb" , S_IRUSR, parent: arch_debugfs_dir, |
153 | data: (void *)TLB_TYPE_ITLB, fops: &tlb_debugfs_fops); |
154 | debugfs_create_file(name: "utlb" , S_IRUSR, parent: arch_debugfs_dir, |
155 | data: (void *)TLB_TYPE_UTLB, fops: &tlb_debugfs_fops); |
156 | return 0; |
157 | } |
158 | module_init(tlb_debugfs_init); |
159 | |
160 | MODULE_LICENSE("GPL v2" ); |
161 | |