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 <linux/debugfs.h>
11#include <asm/cpu_has_feature.h>
12
13#include "ptdump.h"
14
15static 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
60static int bats_show(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
91DEFINE_SHOW_ATTRIBUTE(bats);
92
93static int __init bats_init(void)
94{
95	debugfs_create_file("block_address_translation", 0400,
96			    arch_debugfs_dir, NULL, &bats_fops);
97	return 0;
98}
99device_initcall(bats_init);
100