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 <linux/pgtable.h> 10 #include <asm/debugfs.h> 11 #include <asm/cpu_has_feature.h> 12 13 #include "ptdump.h" 14 15 static char *pp_601(int k, int pp) 16 { 17 if (pp == 0) 18 return k ? " " : "rwx"; 19 if (pp == 1) 20 return k ? "r x" : "rwx"; 21 if (pp == 2) 22 return "rwx"; 23 return "r x"; 24 } 25 26 static void bat_show_601(struct seq_file *m, int idx, u32 lower, u32 upper) 27 { 28 u32 blpi = upper & 0xfffe0000; 29 u32 k = (upper >> 2) & 3; 30 u32 pp = upper & 3; 31 phys_addr_t pbn = PHYS_BAT_ADDR(lower); 32 u32 bsm = lower & 0x3ff; 33 u32 size = (bsm + 1) << 17; 34 35 seq_printf(m, "%d: ", idx); 36 if (!(lower & 0x40)) { 37 seq_puts(m, " -\n"); 38 return; 39 } 40 41 seq_printf(m, "0x%08x-0x%08x ", blpi, blpi + size - 1); 42 #ifdef CONFIG_PHYS_64BIT 43 seq_printf(m, "0x%016llx ", pbn); 44 #else 45 seq_printf(m, "0x%08x ", pbn); 46 #endif 47 pt_dump_size(m, size); 48 49 seq_printf(m, "Kernel %s User %s", pp_601(k & 2, pp), pp_601(k & 1, pp)); 50 51 seq_puts(m, lower & _PAGE_WRITETHRU ? "w " : " "); 52 seq_puts(m, lower & _PAGE_NO_CACHE ? "i " : " "); 53 seq_puts(m, lower & _PAGE_COHERENT ? "m " : " "); 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 pt_dump_size(m, size); 92 93 if (k == 1) 94 seq_puts(m, "User "); 95 else if (k == 2) 96 seq_puts(m, "Kernel "); 97 else 98 seq_puts(m, "Kernel/User "); 99 100 if (lower & BPP_RX) 101 seq_puts(m, is_d ? "r " : " x "); 102 else if (lower & BPP_RW) 103 seq_puts(m, is_d ? "rw " : " x "); 104 else 105 seq_puts(m, is_d ? " " : " "); 106 107 seq_puts(m, lower & _PAGE_WRITETHRU ? "w " : " "); 108 seq_puts(m, lower & _PAGE_NO_CACHE ? "i " : " "); 109 seq_puts(m, lower & _PAGE_COHERENT ? "m " : " "); 110 seq_puts(m, lower & _PAGE_GUARDED ? "g " : " "); 111 seq_puts(m, "\n"); 112 } 113 114 #define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d) 115 116 static int bats_show_603(struct seq_file *m, void *v) 117 { 118 seq_puts(m, "---[ Instruction Block Address Translation ]---\n"); 119 120 BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false); 121 BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false); 122 BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false); 123 BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false); 124 if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) { 125 BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false); 126 BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false); 127 BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false); 128 BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false); 129 } 130 131 seq_puts(m, "\n---[ Data Block Address Translation ]---\n"); 132 133 BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true); 134 BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true); 135 BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true); 136 BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true); 137 if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) { 138 BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true); 139 BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true); 140 BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true); 141 BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true); 142 } 143 144 return 0; 145 } 146 147 static int bats_open(struct inode *inode, struct file *file) 148 { 149 if (IS_ENABLED(CONFIG_PPC_BOOK3S_601)) 150 return single_open(file, bats_show_601, NULL); 151 152 return single_open(file, bats_show_603, NULL); 153 } 154 155 static const struct file_operations bats_fops = { 156 .open = bats_open, 157 .read = seq_read, 158 .llseek = seq_lseek, 159 .release = single_release, 160 }; 161 162 static int __init bats_init(void) 163 { 164 debugfs_create_file("block_address_translation", 0400, 165 powerpc_debugfs_root, NULL, &bats_fops); 166 return 0; 167 } 168 device_initcall(bats_init); 169