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
tlb_seq_show(struct seq_file * file,void * iter)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
tlb_debugfs_open(struct inode * inode,struct file * file)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
tlb_debugfs_init(void)150 static int __init tlb_debugfs_init(void)
151 {
152 debugfs_create_file("itlb", S_IRUSR, arch_debugfs_dir,
153 (void *)TLB_TYPE_ITLB, &tlb_debugfs_fops);
154 debugfs_create_file("utlb", S_IRUSR, arch_debugfs_dir,
155 (void *)TLB_TYPE_UTLB, &tlb_debugfs_fops);
156 return 0;
157 }
158 module_init(tlb_debugfs_init);
159
160 MODULE_LICENSE("GPL v2");
161