From d5d2c264d33b9acf1a0216861942176ee3569258 Mon Sep 17 00:00:00 2001 From: Yu Chien Peter Lin Date: Thu, 21 Sep 2023 10:50:20 +0800 Subject: riscv: Improve PTDUMP to show RSW with non-zero value RSW field can be used to encode 2 bits of software defined information. Currently, PTDUMP only prints "RSW" when its value is 1 or 3. To fix this issue and improve the debugging experience with PTDUMP, we redefine _PAGE_SPECIAL to its original value and use _PAGE_SOFT as the RSW mask, allow it to print the RSW with any non-zero value. This patch also removes the val from the struct prot_bits as it is no longer needed. Signed-off-by: Yu Chien Peter Lin Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti Link: https://lore.kernel.org/r/20230921025022.3989723-2-peterlin@andestech.com Signed-off-by: Palmer Dabbelt --- arch/riscv/mm/ptdump.c | 35 +++++++++++++++-------------------- 1 file changed, 15 insertions(+), 20 deletions(-) (limited to 'arch/riscv/mm') diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c index 20a9f991a6d7..57a0926c6627 100644 --- a/arch/riscv/mm/ptdump.c +++ b/arch/riscv/mm/ptdump.c @@ -129,7 +129,6 @@ static struct ptd_mm_info efi_ptd_info = { /* Page Table Entry */ struct prot_bits { u64 mask; - u64 val; const char *set; const char *clear; }; @@ -137,47 +136,38 @@ struct prot_bits { static const struct prot_bits pte_bits[] = { { .mask = _PAGE_SOFT, - .val = _PAGE_SOFT, - .set = "RSW", - .clear = " ", + .set = "RSW(%d)", + .clear = " .. ", }, { .mask = _PAGE_DIRTY, - .val = _PAGE_DIRTY, .set = "D", .clear = ".", }, { .mask = _PAGE_ACCESSED, - .val = _PAGE_ACCESSED, .set = "A", .clear = ".", }, { .mask = _PAGE_GLOBAL, - .val = _PAGE_GLOBAL, .set = "G", .clear = ".", }, { .mask = _PAGE_USER, - .val = _PAGE_USER, .set = "U", .clear = ".", }, { .mask = _PAGE_EXEC, - .val = _PAGE_EXEC, .set = "X", .clear = ".", }, { .mask = _PAGE_WRITE, - .val = _PAGE_WRITE, .set = "W", .clear = ".", }, { .mask = _PAGE_READ, - .val = _PAGE_READ, .set = "R", .clear = ".", }, { .mask = _PAGE_PRESENT, - .val = _PAGE_PRESENT, .set = "V", .clear = ".", } @@ -208,15 +198,20 @@ static void dump_prot(struct pg_state *st) unsigned int i; for (i = 0; i < ARRAY_SIZE(pte_bits); i++) { - const char *s; - - if ((st->current_prot & pte_bits[i].mask) == pte_bits[i].val) - s = pte_bits[i].set; - else - s = pte_bits[i].clear; + char s[7]; + unsigned long val; + + val = st->current_prot & pte_bits[i].mask; + if (val) { + if (pte_bits[i].mask == _PAGE_SOFT) + sprintf(s, pte_bits[i].set, val >> 8); + else + sprintf(s, "%s", pte_bits[i].set); + } else { + sprintf(s, "%s", pte_bits[i].clear); + } - if (s) - pt_dump_seq_printf(st->seq, " %s", s); + pt_dump_seq_printf(st->seq, " %s", s); } } -- cgit v1.2.3