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chleroympe
chleroy
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powerpc/mm: dump block address translation on book3s/32
This patch adds a debugfs file to dump block address translation: ~# cat /sys/kernel/debug/powerpc/block_address_translation ---[ Instruction Block Address Translations ]--- 0: - 1: - 2: 0xc0000000-0xcfffffff 0x00000000 Kernel EXEC coherent 3: 0xd0000000-0xdfffffff 0x10000000 Kernel EXEC coherent 4: - 5: - 6: - 7: - ---[ Data Block Address Translations ]--- 0: - 1: - 2: 0xc0000000-0xcfffffff 0x00000000 Kernel RW coherent 3: 0xd0000000-0xdfffffff 0x10000000 Kernel RW coherent 4: - 5: - 6: - 7: - Signed-off-by: Christophe Leroy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]>
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‎arch/powerpc/include/asm/book3s/32/mmu-hash.h‎

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Original file line numberDiff line numberDiff line change
@@ -37,8 +37,12 @@
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#define BAT_PHYS_ADDR(x) ((u32)((x & 0x00000000fffe0000ULL) | \
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((x & 0x0000000e00000000ULL) >> 24) | \
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((x & 0x0000000100000000ULL) >> 30)))
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#define PHYS_BAT_ADDR(x) (((u64)(x) & 0x00000000fffe0000ULL) | \
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(((u64)(x) << 24) & 0x0000000e00000000ULL) | \
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(((u64)(x) << 30) & 0x0000000100000000ULL))
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#else
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#define BAT_PHYS_ADDR(x) (x)
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#define PHYS_BAT_ADDR(x) ((x) & 0xfffe0000)
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#endif
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struct ppc_bat {

‎arch/powerpc/mm/Makefile‎

Lines changed: 1 addition & 1 deletion
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@@ -50,7 +50,7 @@ ifdef CONFIG_PPC_PTDUMP
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obj-$(CONFIG_4xx) += dump_linuxpagetables-generic.o
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obj-$(CONFIG_PPC_8xx) += dump_linuxpagetables-8xx.o
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obj-$(CONFIG_PPC_BOOK3E_MMU) += dump_linuxpagetables-generic.o
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obj-$(CONFIG_PPC_BOOK3S_32) += dump_linuxpagetables-generic.o dump_sr.o
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obj-$(CONFIG_PPC_BOOK3S_32) += dump_linuxpagetables-generic.o dump_bats.o dump_sr.o
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obj-$(CONFIG_PPC_BOOK3S_64) += dump_linuxpagetables-book3s64.o
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endif
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obj-$(CONFIG_PPC_HTDUMP) += dump_hashpagetable.o

‎arch/powerpc/mm/dump_bats.c‎

Lines changed: 173 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,173 @@
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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 <asm/debugfs.h>
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#include <asm/pgtable.h>
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#include <asm/cpu_has_feature.h>
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static char *pp_601(int k, int pp)
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{
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if (pp == 0)
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return k ? "NA" : "RWX";
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if (pp == 1)
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return k ? "ROX" : "RWX";
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if (pp == 2)
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return k ? "RWX" : "RWX";
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return k ? "ROX" : "ROX";
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}
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static void bat_show_601(struct seq_file *m, int idx, u32 lower, u32 upper)
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{
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u32 blpi = upper & 0xfffe0000;
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u32 k = (upper >> 2) & 3;
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u32 pp = upper & 3;
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phys_addr_t pbn = PHYS_BAT_ADDR(lower);
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u32 bsm = lower & 0x3ff;
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u32 size = (bsm + 1) << 17;
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seq_printf(m, "%d: ", idx);
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if (!(lower & 0x40)) {
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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 ", blpi, blpi + size - 1);
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#ifdef CONFIG_PHYS_64BIT
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seq_printf(m, "0x%016llx ", pbn);
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#else
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seq_printf(m, "0x%08x ", pbn);
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#endif
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seq_printf(m, "Kernel %s User %s", pp_601(k & 2, pp), pp_601(k & 1, pp));
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if (lower & _PAGE_WRITETHRU)
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seq_puts(m, "write through ");
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if (lower & _PAGE_NO_CACHE)
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seq_puts(m, "no cache ");
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if (lower & _PAGE_COHERENT)
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seq_puts(m, "coherent ");
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seq_puts(m, "\n");
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}
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#define BAT_SHOW_601(_m, _n, _l, _u) bat_show_601(_m, _n, mfspr(_l), mfspr(_u))
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static int bats_show_601(struct seq_file *m, void *v)
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{
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seq_puts(m, "---[ Block Address Translation ]---\n");
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BAT_SHOW_601(m, 0, SPRN_IBAT0L, SPRN_IBAT0U);
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BAT_SHOW_601(m, 1, SPRN_IBAT1L, SPRN_IBAT1U);
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BAT_SHOW_601(m, 2, SPRN_IBAT2L, SPRN_IBAT2U);
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BAT_SHOW_601(m, 3, SPRN_IBAT3L, SPRN_IBAT3U);
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return 0;
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}
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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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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 ? "RO " : "EXEC ");
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else if (lower & BPP_RW)
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seq_puts(m, is_d ? "RW " : "EXEC ");
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else
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seq_puts(m, is_d ? "NA " : "NX ");
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if (lower & _PAGE_WRITETHRU)
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seq_puts(m, "write through ");
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if (lower & _PAGE_NO_CACHE)
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seq_puts(m, "no cache ");
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if (lower & _PAGE_COHERENT)
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seq_puts(m, "coherent ");
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if (lower & _PAGE_GUARDED)
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seq_puts(m, "guarded ");
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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_603(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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static int bats_open(struct inode *inode, struct file *file)
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{
152+
if (cpu_has_feature(CPU_FTR_601))
153+
return single_open(file, bats_show_601, NULL);
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return single_open(file, bats_show_603, NULL);
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}
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static const struct file_operations bats_fops = {
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.open = bats_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init bats_init(void)
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{
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struct dentry *debugfs_file;
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debugfs_file = debugfs_create_file("block_address_translation", 0400,
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powerpc_debugfs_root, NULL, &bats_fops);
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return debugfs_file ? 0 : -ENOMEM;
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}
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device_initcall(bats_init);

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