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SubjectRe: [PATCH] powerpc/mm: dump block address translation on book3s/32
Date
Christophe Leroy <christophe.leroy@c-s.fr> writes:

> This patch adds a debugfs file to dump block address translation:
>
> ~# cat /sys/kernel/debug/block_address_translation

My instinct is it should be in /sys/kernel/debug/powerpc. But I guess
the other page table dump files are not.

> 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 <christophe.leroy@c-s.fr>
> ---
> Tested on mpc8321 aka 603
> Please review/test the 601 part
>
> arch/powerpc/mm/Makefile | 2 +-
> arch/powerpc/mm/dump_bats.c | 176 ++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 177 insertions(+), 1 deletion(-)
> create mode 100644 arch/powerpc/mm/dump_bats.c
>
> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
> index ca96e7be4d0e..2adad10b5856 100644
> --- a/arch/powerpc/mm/Makefile
> +++ b/arch/powerpc/mm/Makefile
> @@ -47,7 +47,7 @@ ifdef CONFIG_PPC_PTDUMP
> obj-$(CONFIG_4xx) += dump_linuxpagetables-generic.o
> obj-$(CONFIG_PPC_8xx) += dump_linuxpagetables-8xx.o
> obj-$(CONFIG_PPC_BOOK3E_MMU) += dump_linuxpagetables-generic.o
> -obj-$(CONFIG_PPC_BOOK3S_32) += dump_linuxpagetables-generic.o
> +obj-$(CONFIG_PPC_BOOK3S_32) += dump_linuxpagetables-generic.o dump_bats.o

BOOK3S_32 covers quite a lot of CPUs.

But below the only check is that you're on 601 or 603.

So is the 603 code going to work on all other BOOK3S_32 CPUs?

cheers

> diff --git a/arch/powerpc/mm/dump_bats.c b/arch/powerpc/mm/dump_bats.c
> new file mode 100644
> index 000000000000..824a94ee9051
> --- /dev/null
> +++ b/arch/powerpc/mm/dump_bats.c
> @@ -0,0 +1,176 @@
> +// 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 <linux/debugfs.h>
> +#include <linux/fs.h>
> +#include <linux/hugetlb.h>
> +#include <linux/io.h>
> +#include <linux/mm.h>
> +#include <linux/sched.h>
> +#include <linux/seq_file.h>
> +#include <asm/fixmap.h>
> +#include <asm/pgtable.h>
> +#include <linux/const.h>
> +#include <asm/page.h>
> +#include <asm/pgalloc.h>
> +
> +#include <asm/book3s/32/mmu-hash.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;
> + u32 pbn = lower & 0xfffe0000;
> + 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);
> + seq_printf(m, "0x%08x ", pbn);
> +
> + 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;
> + u32 brpn = lower & 0xfffe0000;
> + 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);
> + seq_printf(m, "0x%08x ", brpn);
> +
> + 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, "\nData 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 (PVR_VER(mfspr(SPRN_PVR)) == 1)
> + 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 bats_init(void)
> +{
> + struct dentry *debugfs_file;
> +
> + debugfs_file = debugfs_create_file("block_address_translation", 0400,
> + NULL, NULL, &bats_fops);
> + return debugfs_file ? 0 : -ENOMEM;
> +}
> +device_initcall(bats_init);
> --
> 2.13.3

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