linux/arch/sh/mm/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
  20enum tlb_type {
  21        TLB_TYPE_ITLB,
  22        TLB_TYPE_UTLB,
  23};
  24
  25static 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
  39static 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
 137static int tlb_debugfs_open(struct inode *inode, struct file *file)
 138{
 139        return single_open(file, tlb_seq_show, inode->i_private);
 140}
 141
 142static 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
 150static int __init tlb_debugfs_init(void)
 151{
 152        struct dentry *itlb, *utlb;
 153
 154        itlb = debugfs_create_file("itlb", S_IRUSR, arch_debugfs_dir,
 155                                   (unsigned int *)TLB_TYPE_ITLB,
 156                                   &tlb_debugfs_fops);
 157        if (unlikely(!itlb))
 158                return -ENOMEM;
 159
 160        utlb = debugfs_create_file("utlb", S_IRUSR, arch_debugfs_dir,
 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}
 170module_init(tlb_debugfs_init);
 171
 172MODULE_LICENSE("GPL v2");
 173