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 void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d)
  16 {
  17         u32 bepi = upper & 0xfffe0000;
  18         u32 bl = (upper >> 2) & 0x7ff;
  19         u32 k = upper & 3;
  20         phys_addr_t brpn = PHYS_BAT_ADDR(lower);
  21         u32 size = (bl + 1) << 17;
  22
  23         seq_printf(m, "%d: ", idx);
  24         if (k == 0) {
  25                 seq_puts(m, "        -\n");
  26                 return;
  27         }
  28
  29         seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1);
  30 #ifdef CONFIG_PHYS_64BIT
  31         seq_printf(m, "0x%016llx ", brpn);
  32 #else
  33         seq_printf(m, "0x%08x ", brpn);
  34 #endif
  35         pt_dump_size(m, size);
  36
  37         if (k == 1)
  38                 seq_puts(m, "User ");
  39         else if (k == 2)
  40                 seq_puts(m, "Kernel ");
  41         else
  42                 seq_puts(m, "Kernel/User ");
  43
  44         if (lower & BPP_RX)
  45                 seq_puts(m, is_d ? "r   " : "  x ");
  46         else if (lower & BPP_RW)
  47                 seq_puts(m, is_d ? "rw  " : "  x ");
  48         else
  49                 seq_puts(m, is_d ? "    " : "    ");
  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, lower & _PAGE_GUARDED ? "g " : "  ");
  55         seq_puts(m, "\n");
  56 }
  57
  58 #define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d)
  59
  60 static int bats_show_603(struct seq_file *m, void *v)
  61 {
  62         seq_puts(m, "---[ Instruction Block Address Translation ]---\n");
  63
  64         BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false);
  65         BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false);
  66         BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false);
  67         BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false);
  68         if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
  69                 BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false);
  70                 BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false);
  71                 BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false);
  72                 BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false);
  73         }
  74
  75         seq_puts(m, "\n---[ Data Block Address Translation ]---\n");
  76
  77         BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true);
  78         BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true);
  79         BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true);
  80         BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true);
  81         if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
  82                 BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true);
  83                 BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true);
  84                 BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true);
  85                 BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true);
  86         }
  87
  88         return 0;
  89 }
  90
  91 static int bats_open(struct inode *inode, struct file *file)
  92 {
  93         return single_open(file, bats_show_603, NULL);
  94 }
  95
  96 static const struct file_operations bats_fops = {
  97         .open           = bats_open,
  98         .read           = seq_read,
  99         .llseek         = seq_lseek,
 100         .release        = single_release,
 101 };
 102
 103 static int __init bats_init(void)
 104 {
 105         debugfs_create_file("block_address_translation", 0400,
 106                             powerpc_debugfs_root, NULL, &bats_fops);
 107         return 0;
 108 }
 109 device_initcall(bats_init);