| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright 2018, Christophe Leroy CS S.I. |
| * <christophe.leroy@c-s.fr> |
| * |
| * This dumps the content of BATS |
| */ |
| |
| #include <asm/debugfs.h> |
| #include <asm/pgtable.h> |
| #include <asm/cpu_has_feature.h> |
| |
| static char *pp_601(int k, int pp) |
| { |
| if (pp == 0) |
| return k ? "NA" : "RWX"; |
| if (pp == 1) |
| return k ? "ROX" : "RWX"; |
| if (pp == 2) |
| return k ? "RWX" : "RWX"; |
| return k ? "ROX" : "ROX"; |
| } |
| |
| static void bat_show_601(struct seq_file *m, int idx, u32 lower, u32 upper) |
| { |
| u32 blpi = upper & 0xfffe0000; |
| u32 k = (upper >> 2) & 3; |
| u32 pp = upper & 3; |
| phys_addr_t pbn = PHYS_BAT_ADDR(lower); |
| u32 bsm = lower & 0x3ff; |
| u32 size = (bsm + 1) << 17; |
| |
| seq_printf(m, "%d: ", idx); |
| if (!(lower & 0x40)) { |
| seq_puts(m, " -\n"); |
| return; |
| } |
| |
| seq_printf(m, "0x%08x-0x%08x ", blpi, blpi + size - 1); |
| #ifdef CONFIG_PHYS_64BIT |
| seq_printf(m, "0x%016llx ", pbn); |
| #else |
| seq_printf(m, "0x%08x ", pbn); |
| #endif |
| |
| seq_printf(m, "Kernel %s User %s", pp_601(k & 2, pp), pp_601(k & 1, pp)); |
| |
| if (lower & _PAGE_WRITETHRU) |
| seq_puts(m, "write through "); |
| if (lower & _PAGE_NO_CACHE) |
| seq_puts(m, "no cache "); |
| if (lower & _PAGE_COHERENT) |
| seq_puts(m, "coherent "); |
| seq_puts(m, "\n"); |
| } |
| |
| #define BAT_SHOW_601(_m, _n, _l, _u) bat_show_601(_m, _n, mfspr(_l), mfspr(_u)) |
| |
| static int bats_show_601(struct seq_file *m, void *v) |
| { |
| seq_puts(m, "---[ Block Address Translation ]---\n"); |
| |
| BAT_SHOW_601(m, 0, SPRN_IBAT0L, SPRN_IBAT0U); |
| BAT_SHOW_601(m, 1, SPRN_IBAT1L, SPRN_IBAT1U); |
| BAT_SHOW_601(m, 2, SPRN_IBAT2L, SPRN_IBAT2U); |
| BAT_SHOW_601(m, 3, SPRN_IBAT3L, SPRN_IBAT3U); |
| |
| return 0; |
| } |
| |
| static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d) |
| { |
| u32 bepi = upper & 0xfffe0000; |
| u32 bl = (upper >> 2) & 0x7ff; |
| u32 k = upper & 3; |
| phys_addr_t brpn = PHYS_BAT_ADDR(lower); |
| u32 size = (bl + 1) << 17; |
| |
| seq_printf(m, "%d: ", idx); |
| if (k == 0) { |
| seq_puts(m, " -\n"); |
| return; |
| } |
| |
| seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1); |
| #ifdef CONFIG_PHYS_64BIT |
| seq_printf(m, "0x%016llx ", brpn); |
| #else |
| seq_printf(m, "0x%08x ", brpn); |
| #endif |
| |
| if (k == 1) |
| seq_puts(m, "User "); |
| else if (k == 2) |
| seq_puts(m, "Kernel "); |
| else |
| seq_puts(m, "Kernel/User "); |
| |
| if (lower & BPP_RX) |
| seq_puts(m, is_d ? "RO " : "EXEC "); |
| else if (lower & BPP_RW) |
| seq_puts(m, is_d ? "RW " : "EXEC "); |
| else |
| seq_puts(m, is_d ? "NA " : "NX "); |
| |
| if (lower & _PAGE_WRITETHRU) |
| seq_puts(m, "write through "); |
| if (lower & _PAGE_NO_CACHE) |
| seq_puts(m, "no cache "); |
| if (lower & _PAGE_COHERENT) |
| seq_puts(m, "coherent "); |
| if (lower & _PAGE_GUARDED) |
| seq_puts(m, "guarded "); |
| seq_puts(m, "\n"); |
| } |
| |
| #define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d) |
| |
| static int bats_show_603(struct seq_file *m, void *v) |
| { |
| seq_puts(m, "---[ Instruction Block Address Translation ]---\n"); |
| |
| BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false); |
| BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false); |
| BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false); |
| BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false); |
| if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) { |
| BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false); |
| BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false); |
| BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false); |
| BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false); |
| } |
| |
| seq_puts(m, "\n---[ Data Block Address Translation ]---\n"); |
| |
| BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true); |
| BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true); |
| BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true); |
| BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true); |
| if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) { |
| BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true); |
| BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true); |
| BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true); |
| BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true); |
| } |
| |
| return 0; |
| } |
| |
| static int bats_open(struct inode *inode, struct file *file) |
| { |
| if (IS_ENABLED(CONFIG_PPC_BOOK3S_601)) |
| return single_open(file, bats_show_601, NULL); |
| |
| return single_open(file, bats_show_603, NULL); |
| } |
| |
| static const struct file_operations bats_fops = { |
| .open = bats_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int __init bats_init(void) |
| { |
| struct dentry *debugfs_file; |
| |
| debugfs_file = debugfs_create_file("block_address_translation", 0400, |
| powerpc_debugfs_root, NULL, &bats_fops); |
| return debugfs_file ? 0 : -ENOMEM; |
| } |
| device_initcall(bats_init); |