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