mm/ptdump/bats.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright 2018, Christophe Leroy CS S.I.
0004  * <christophe.leroy@c-s.fr>
0005  *
0006  * This dumps the content of BATS
0007  */
0008
0009 #include <linux/pgtable.h>
0010 #include <linux/debugfs.h>
0011 #include <asm/cpu_has_feature.h>
0012
0013 #include "ptdump.h"
0014
0015 static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d)
0016 {
0017     u32 bepi = upper & 0xfffe0000;
0018     u32 bl = (upper >> 2) & 0x7ff;
0019     u32 k = upper & 3;
0020     phys_addr_t brpn = PHYS_BAT_ADDR(lower);
0021     u32 size = (bl + 1) << 17;
0022
0023     seq_printf(m, "%d: ", idx);
0024     if (k == 0) {
0025         seq_puts(m, "        -\n");
0026         return;
0027     }
0028
0029     seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1);
0030 #ifdef CONFIG_PHYS_64BIT
0031     seq_printf(m, "0x%016llx ", brpn);
0032 #else
0033     seq_printf(m, "0x%08x ", brpn);
0034 #endif
0035     pt_dump_size(m, size);
0036
0037     if (k == 1)
0038         seq_puts(m, "User ");
0039     else if (k == 2)
0040         seq_puts(m, "Kernel ");
0041     else
0042         seq_puts(m, "Kernel/User ");
0043
0044     if (lower & BPP_RX)
0045         seq_puts(m, is_d ? "r   " : "  x ");
0046     else if (lower & BPP_RW)
0047         seq_puts(m, is_d ? "rw  " : "  x ");
0048     else
0049         seq_puts(m, is_d ? "    " : "    ");
0050
0051     seq_puts(m, lower & _PAGE_WRITETHRU ? "w " : "  ");
0052     seq_puts(m, lower & _PAGE_NO_CACHE ? "i " : "  ");
0053     seq_puts(m, lower & _PAGE_COHERENT ? "m " : "  ");
0054     seq_puts(m, lower & _PAGE_GUARDED ? "g " : "  ");
0055     seq_puts(m, "\n");
0056 }
0057
0058 #define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d)
0059
0060 static int bats_show(struct seq_file *m, void *v)
0061 {
0062     seq_puts(m, "---[ Instruction Block Address Translation ]---\n");
0063
0064     BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false);
0065     BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false);
0066     BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false);
0067     BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false);
0068     if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
0069         BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false);
0070         BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false);
0071         BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false);
0072         BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false);
0073     }
0074
0075     seq_puts(m, "\n---[ Data Block Address Translation ]---\n");
0076
0077     BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true);
0078     BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true);
0079     BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true);
0080     BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true);
0081     if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
0082         BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true);
0083         BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true);
0084         BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true);
0085         BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true);
0086     }
0087
0088     return 0;
0089 }
0090
0091 DEFINE_SHOW_ATTRIBUTE(bats);
0092
0093 static int __init bats_init(void)
0094 {
0095     debugfs_create_file("block_address_translation", 0400,
0096                 arch_debugfs_dir, NULL, &bats_fops);
0097     return 0;
0098 }
0099 device_initcall(bats_init);