linux-kernel - [PATCH v2 03/11] arm64: ptdump: Add the walker function to the ptdump info structure

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Date:   Thu, 19 Oct 2023 14:40:25 +0000
From:   Sebastian Ene <sebastianene@...gle.com>
To:     will@...nel.org, catalin.marinas@....com, mark.rutland@....com,
        akpm@...ux-foundation.org, maz@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, vdonnefort@...gle.com, qperret@...gle.com,
        smostafa@...gle.com, Sebastian Ene <sebastianene@...gle.com>
Subject: [PATCH v2 03/11] arm64: ptdump: Add the walker function to the ptdump
 info structure

Stage-2 needs a dedicated walk function to be able to parse concatenated
pagetables. The ptdump info structure is used to hold different
configuration options for the walker. This structure is registered with
the debugfs entry and is stored in the argument for the debugfs file.
Hence, in preparation for parsing the stage-2 pagetables add the walk
function as an argument for the debugfs file.

Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
---
 arch/arm64/include/asm/ptdump.h | 1 +
 arch/arm64/mm/ptdump.c          | 1 +
 arch/arm64/mm/ptdump_debugfs.c  | 3 ++-
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/ptdump.h b/arch/arm64/include/asm/ptdump.h
index 581caac525b0..1f6e0aabf16a 100644
--- a/arch/arm64/include/asm/ptdump.h
+++ b/arch/arm64/include/asm/ptdump.h
@@ -19,6 +19,7 @@ struct ptdump_info {
 	struct mm_struct		*mm;
 	const struct addr_marker	*markers;
 	unsigned long			base_addr;
+	void (*ptdump_walk)(struct seq_file *s, struct ptdump_info *info);
 };
 
 void ptdump_walk(struct seq_file *s, struct ptdump_info *info);
diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
index 8761a70f916f..d531e24ea0b2 100644
--- a/arch/arm64/mm/ptdump.c
+++ b/arch/arm64/mm/ptdump.c
@@ -346,6 +346,7 @@ static struct ptdump_info kernel_ptdump_info = {
 	.mm		= &init_mm,
 	.markers	= address_markers,
 	.base_addr	= PAGE_OFFSET,
+	.ptdump_walk	= &ptdump_walk,
 };
 
 void ptdump_check_wx(void)
diff --git a/arch/arm64/mm/ptdump_debugfs.c b/arch/arm64/mm/ptdump_debugfs.c
index 68bf1a125502..7564519db1e6 100644
--- a/arch/arm64/mm/ptdump_debugfs.c
+++ b/arch/arm64/mm/ptdump_debugfs.c
@@ -10,7 +10,8 @@ static int ptdump_show(struct seq_file *m, void *v)
 	struct ptdump_info *info = m->private;
 
 	get_online_mems();
-	ptdump_walk(m, info);
+	if (info->ptdump_walk)
+		info->ptdump_walk(m, info);
 	put_online_mems();
 	return 0;
 }
-- 
2.42.0.655.g421f12c284-goog