arch/powerpc/mm/ptdump/bats.c

   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);