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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/mm/ptdump/bats.c
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// SPDX-License-Identifier: GPL-2.0+

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/*

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 * Copyright 2018, Christophe Leroy CS S.I.

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 * <[email protected]>

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 *

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 * This dumps the content of BATS

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 */

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#include <linux/pgtable.h>

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#include <linux/debugfs.h>

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#include <asm/cpu_has_feature.h>

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#include "ptdump.h"

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static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d)

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{

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	u32 bepi = upper & 0xfffe0000;

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	u32 bl = (upper >> 2) & 0x7ff;

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	u32 k = upper & 3;

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	phys_addr_t brpn = PHYS_BAT_ADDR(lower);

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	u32 size = (bl + 1) << 17;

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	seq_printf(m, "%d: ", idx);

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	if (k == 0) {

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		seq_puts(m, "        -\n");

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		return;

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	}

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	seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1);

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#ifdef CONFIG_PHYS_64BIT

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	seq_printf(m, "0x%016llx ", brpn);

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#else

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	seq_printf(m, "0x%08x ", brpn);

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#endif

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	pt_dump_size(m, size);

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	if (k == 1)

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		seq_puts(m, "User ");

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	else if (k == 2)

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		seq_puts(m, "Kernel ");

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	else

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		seq_puts(m, "Kernel/User ");

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	if (lower & BPP_RX)

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		seq_puts(m, is_d ? "r   " : "  x ");

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	else if (lower & BPP_RW)

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		seq_puts(m, is_d ? "rw  " : "  x ");

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	else

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		seq_puts(m, is_d ? "    " : "    ");

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	seq_puts(m, lower & _PAGE_WRITETHRU ? "w " : "  ");

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	seq_puts(m, lower & _PAGE_NO_CACHE ? "i " : "  ");

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	seq_puts(m, lower & _PAGE_COHERENT ? "m " : "  ");

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	seq_puts(m, lower & _PAGE_GUARDED ? "g " : "  ");

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	seq_puts(m, "\n");

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}

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#define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d)

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static int bats_show(struct seq_file *m, void *v)

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{

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	seq_puts(m, "---[ Instruction Block Address Translation ]---\n");

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	BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false);

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	BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false);

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	BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false);

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	BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false);

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	if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {

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		BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false);

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		BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false);

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		BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false);

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		BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false);

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	}

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	seq_puts(m, "\n---[ Data Block Address Translation ]---\n");

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	BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true);

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	BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true);

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	BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true);

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	BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true);

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	if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {

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		BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true);

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		BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true);

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		BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true);

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		BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true);

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	}

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	return 0;

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}

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DEFINE_SHOW_ATTRIBUTE(bats);

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static int __init bats_init(void)

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{

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	debugfs_create_file("block_address_translation", 0400,

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			    arch_debugfs_dir, NULL, &bats_fops);

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	return 0;

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}

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device_initcall(bats_init);

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