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
bat_show_603(struct seq_file * m,int idx,u32 lower,u32 upper,bool is_d)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
bats_show_603(struct seq_file * m,void * v)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
bats_open(struct inode * inode,struct file * file)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
bats_init(void)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);
110
