Linux Kernel  3.7.1
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tlb-debugfs.c
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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 {
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;
59  nentries = 4;
60  } else {
61  addr1 = MMU_UTLB_ADDRESS_ARRAY;
65  nentries = 64;
66  }
67 
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;
82  nentries = 4;
83  } else {
84  addr1 = MMU_UTLB_ADDRESS_ARRAY;
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 
106  ctrl_barrier();
107  asid = val & MMU_CONTEXT_ASID_MASK;
108 
110  ctrl_barrier();
111  ppn = (val & 0x0ffffc00) << 4;
112 
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();
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 
155  (unsigned int *)TLB_TYPE_ITLB,
156  &tlb_debugfs_fops);
157  if (unlikely(!itlb))
158  return -ENOMEM;
159 
161  (unsigned int *)TLB_TYPE_UTLB,
162  &tlb_debugfs_fops);
163  if (unlikely(!utlb)) {
164  debugfs_remove(itlb);
165  return -ENOMEM;
166  }
167 
168  return 0;
169 }
170 module_init(tlb_debugfs_init);
171 
172 MODULE_LICENSE("GPL v2");