[PATCH v10 3/5] arm64: ptdump: Use the ptdump description from a local context

From: Sebastian Ene
Date: Mon Sep 09 2024 - 08:48:19 EST


Rename the attributes description array to allow the parsing method
to use the description from a local context. To be able to do this,
store a pointer to the description array in the state structure. This
will allow for the later introduced callers (stage_2 ptdump) to specify
their own page table description format to the ptdump parser.

Signed-off-by: Sebastian Ene <sebastianene@xxxxxxxxxx>
---
arch/arm64/include/asm/ptdump.h | 1 +
arch/arm64/mm/ptdump.c | 13 ++++++++-----
2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/include/asm/ptdump.h b/arch/arm64/include/asm/ptdump.h
index bd5d3ee3e8dc..71a7ed01153a 100644
--- a/arch/arm64/include/asm/ptdump.h
+++ b/arch/arm64/include/asm/ptdump.h
@@ -44,6 +44,7 @@ struct ptdump_pg_level {
*/
struct ptdump_pg_state {
struct ptdump_state ptdump;
+ struct ptdump_pg_level *pg_level;
struct seq_file *seq;
const struct addr_marker *marker;
const struct mm_struct *mm;
diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
index 404751fd30fe..ca53ef274a8b 100644
--- a/arch/arm64/mm/ptdump.c
+++ b/arch/arm64/mm/ptdump.c
@@ -117,7 +117,7 @@ static const struct ptdump_prot_bits pte_bits[] = {
}
};

-static struct ptdump_pg_level pg_level[] __ro_after_init = {
+static struct ptdump_pg_level kernel_pg_levels[] __ro_after_init = {
{ /* pgd */
.name = "PGD",
.bits = pte_bits,
@@ -192,6 +192,7 @@ void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
u64 val)
{
struct ptdump_pg_state *st = container_of(pt_st, struct ptdump_pg_state, ptdump);
+ struct ptdump_pg_level *pg_level = st->pg_level;
static const char units[] = "KMGTPE";
u64 prot = 0;

@@ -262,6 +263,7 @@ void ptdump_walk(struct seq_file *s, struct ptdump_info *info)
.seq = s,
.marker = info->markers,
.mm = info->mm,
+ .pg_level = &kernel_pg_levels[0],
.level = -1,
.ptdump = {
.note_page = note_page,
@@ -279,10 +281,10 @@ static void __init ptdump_initialize(void)
{
unsigned i, j;

- for (i = 0; i < ARRAY_SIZE(pg_level); i++)
- if (pg_level[i].bits)
- for (j = 0; j < pg_level[i].num; j++)
- pg_level[i].mask |= pg_level[i].bits[j].mask;
+ for (i = 0; i < ARRAY_SIZE(kernel_pg_levels); i++)
+ if (kernel_pg_levels[i].bits)
+ for (j = 0; j < kernel_pg_levels[i].num; j++)
+ kernel_pg_levels[i].mask |= kernel_pg_levels[i].bits[j].mask;
}

static struct ptdump_info kernel_ptdump_info __ro_after_init = {
@@ -297,6 +299,7 @@ bool ptdump_check_wx(void)
{ 0, NULL},
{ -1, NULL},
},
+ .pg_level = &kernel_pg_levels[0],
.level = -1,
.check_wx = true,
.ptdump = {
--
2.46.0.469.g59c65b2a67-goog