1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2018, Christophe Leroy CS S.I. 4 * <christophe.leroy@c-s.fr> 5 * 6 * This dumps the content of BATS 7 */ 8 9 #include <asm/debugfs.h> 10 #include <asm/pgtable.h> 11 #include <asm/cpu_has_feature.h> 12 13 static char *pp_601(int k, int pp) 14 { 15 if (pp == 0) 16 return k ? "NA" : "RWX"; 17 if (pp == 1) 18 return k ? "ROX" : "RWX"; 19 if (pp == 2) 20 return k ? "RWX" : "RWX"; 21 return k ? "ROX" : "ROX"; 22 } 23 24 static void bat_show_601(struct seq_file *m, int idx, u32 lower, u32 upper) 25 { 26 u32 blpi = upper & 0xfffe0000; 27 u32 k = (upper >> 2) & 3; 28 u32 pp = upper & 3; 29 phys_addr_t pbn = PHYS_BAT_ADDR(lower); 30 u32 bsm = lower & 0x3ff; 31 u32 size = (bsm + 1) << 17; 32 33 seq_printf(m, "%d: ", idx); 34 if (!(lower & 0x40)) { 35 seq_puts(m, " -\n"); 36 return; 37 } 38 39 seq_printf(m, "0x%08x-0x%08x ", blpi, blpi + size - 1); 40 #ifdef CONFIG_PHYS_64BIT 41 seq_printf(m, "0x%016llx ", pbn); 42 #else 43 seq_printf(m, "0x%08x ", pbn); 44 #endif 45 46 seq_printf(m, "Kernel %s User %s", pp_601(k & 2, pp), pp_601(k & 1, pp)); 47 48 if (lower & _PAGE_WRITETHRU) 49 seq_puts(m, "write through "); 50 if (lower & _PAGE_NO_CACHE) 51 seq_puts(m, "no cache "); 52 if (lower & _PAGE_COHERENT) 53 seq_puts(m, "coherent "); 54 seq_puts(m, "\n"); 55 } 56 57 #define BAT_SHOW_601(_m, _n, _l, _u) bat_show_601(_m, _n, mfspr(_l), mfspr(_u)) 58 59 static int bats_show_601(struct seq_file *m, void *v) 60 { 61 seq_puts(m, "---[ Block Address Translation ]---\n"); 62 63 BAT_SHOW_601(m, 0, SPRN_IBAT0L, SPRN_IBAT0U); 64 BAT_SHOW_601(m, 1, SPRN_IBAT1L, SPRN_IBAT1U); 65 BAT_SHOW_601(m, 2, SPRN_IBAT2L, SPRN_IBAT2U); 66 BAT_SHOW_601(m, 3, SPRN_IBAT3L, SPRN_IBAT3U); 67 68 return 0; 69 } 70 71 static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d) 72 { 73 u32 bepi = upper & 0xfffe0000; 74 u32 bl = (upper >> 2) & 0x7ff; 75 u32 k = upper & 3; 76 phys_addr_t brpn = PHYS_BAT_ADDR(lower); 77 u32 size = (bl + 1) << 17; 78 79 seq_printf(m, "%d: ", idx); 80 if (k == 0) { 81 seq_puts(m, " -\n"); 82 return; 83 } 84 85 seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1); 86 #ifdef CONFIG_PHYS_64BIT 87 seq_printf(m, "0x%016llx ", brpn); 88 #else 89 seq_printf(m, "0x%08x ", brpn); 90 #endif 91 92 if (k == 1) 93 seq_puts(m, "User "); 94 else if (k == 2) 95 seq_puts(m, "Kernel "); 96 else 97 seq_puts(m, "Kernel/User "); 98 99 if (lower & BPP_RX) 100 seq_puts(m, is_d ? "RO " : "EXEC "); 101 else if (lower & BPP_RW) 102 seq_puts(m, is_d ? "RW " : "EXEC "); 103 else 104 seq_puts(m, is_d ? "NA " : "NX "); 105 106 if (lower & _PAGE_WRITETHRU) 107 seq_puts(m, "write through "); 108 if (lower & _PAGE_NO_CACHE) 109 seq_puts(m, "no cache "); 110 if (lower & _PAGE_COHERENT) 111 seq_puts(m, "coherent "); 112 if (lower & _PAGE_GUARDED) 113 seq_puts(m, "guarded "); 114 seq_puts(m, "\n"); 115 } 116 117 #define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d) 118 119 static int bats_show_603(struct seq_file *m, void *v) 120 { 121 seq_puts(m, "---[ Instruction Block Address Translation ]---\n"); 122 123 BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false); 124 BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false); 125 BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false); 126 BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false); 127 if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) { 128 BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false); 129 BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false); 130 BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false); 131 BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false); 132 } 133 134 seq_puts(m, "\n---[ Data Block Address Translation ]---\n"); 135 136 BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true); 137 BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true); 138 BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true); 139 BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true); 140 if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) { 141 BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true); 142 BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true); 143 BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true); 144 BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true); 145 } 146 147 return 0; 148 } 149 150 static int bats_open(struct inode *inode, struct file *file) 151 { 152 if (IS_ENABLED(CONFIG_PPC_BOOK3S_601)) 153 return single_open(file, bats_show_601, NULL); 154 155 return single_open(file, bats_show_603, NULL); 156 } 157 158 static const struct file_operations bats_fops = { 159 .open = bats_open, 160 .read = seq_read, 161 .llseek = seq_lseek, 162 .release = single_release, 163 }; 164 165 static int __init bats_init(void) 166 { 167 struct dentry *debugfs_file; 168 169 debugfs_file = debugfs_create_file("block_address_translation", 0400, 170 powerpc_debugfs_root, NULL, &bats_fops); 171 return debugfs_file ? 0 : -ENOMEM; 172 } 173 device_initcall(bats_init); 174