linux-kernel - [PATCH v6 2/6] arm64: ptdump: Expose the attribute parsing functionality

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Message-ID: <20240220151035.327199-3-sebastianene@google.com>
Date: Tue, 20 Feb 2024 15:10:31 +0000
From: Sebastian Ene <sebastianene@...gle.com>
To: catalin.marinas@....com, gshan@...hat.com, james.morse@....com, 
	mark.rutland@....com, maz@...nel.org, oliver.upton@...ux.dev, 
	rananta@...gle.com, ricarkol@...gle.com, ryan.roberts@....com, 
	shahuang@...hat.com, suzuki.poulose@....com, will@...nel.org, 
	yuzenghui@...wei.com
Cc: kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, kernel-team@...roid.com, vdonnefort@...gle.com, 
	Sebastian Ene <sebastianene@...gle.com>
Subject: [PATCH v6 2/6] arm64: ptdump: Expose the attribute parsing functionality

To keep the same output format as the arch specific ptdump and for the
sake of reusability, move the parser's state tracking code out
of the arch specific.

Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
---
 arch/arm64/include/asm/ptdump.h | 41 ++++++++++++++++++++++++++++++++-
 arch/arm64/mm/ptdump.c          | 36 ++---------------------------
 2 files changed, 42 insertions(+), 35 deletions(-)

diff --git a/arch/arm64/include/asm/ptdump.h b/arch/arm64/include/asm/ptdump.h
index 581caac525b0..23510be35084 100644
--- a/arch/arm64/include/asm/ptdump.h
+++ b/arch/arm64/include/asm/ptdump.h
@@ -9,6 +9,8 @@
 
 #include <linux/mm_types.h>
 #include <linux/seq_file.h>
+#include <linux/ptdump.h>
+
 
 struct addr_marker {
 	unsigned long start_address;
@@ -21,15 +23,52 @@ struct ptdump_info {
 	unsigned long			base_addr;
 };
 
+struct prot_bits {
+	u64		mask;
+	u64		val;
+	const char	*set;
+	const char	*clear;
+};
+
+struct pg_level {
+	const struct prot_bits	*bits;
+	const char		*name;
+	size_t			num;
+	u64			mask;
+};
+
+/*
+ * The page dumper groups page table entries of the same type into a single
+ * description. It uses pg_state to track the range information while
+ * iterating over the pte entries. When the continuity is broken it then
+ * dumps out a description of the range.
+ */
+struct pg_state {
+	struct ptdump_state		ptdump;
+	struct seq_file			*seq;
+	const struct addr_marker	*marker;
+	unsigned long			start_address;
+	int				level;
+	u64				current_prot;
+	bool				check_wx;
+	unsigned long			wx_pages;
+	unsigned long			uxn_pages;
+};
+
 void ptdump_walk(struct seq_file *s, struct ptdump_info *info);
+void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
+	       u64 val);
 #ifdef CONFIG_PTDUMP_DEBUGFS
 #define EFI_RUNTIME_MAP_END	DEFAULT_MAP_WINDOW_64
 void __init ptdump_debugfs_register(struct ptdump_info *info, const char *name);
 #else
 static inline void ptdump_debugfs_register(struct ptdump_info *info,
 					   const char *name) { }
-#endif
+#endif /* CONFIG_PTDUMP_DEBUGFS */
 void ptdump_check_wx(void);
+#else
+static inline void note_page(void *pt_st, unsigned long addr,
+			     int level, u64 val) { }
 #endif /* CONFIG_PTDUMP_CORE */
 
 #ifdef CONFIG_DEBUG_WX
diff --git a/arch/arm64/mm/ptdump.c b/arch/arm64/mm/ptdump.c
index e305b6593c4e..64127c70b109 100644
--- a/arch/arm64/mm/ptdump.c
+++ b/arch/arm64/mm/ptdump.c
@@ -66,31 +66,6 @@ static struct addr_marker address_markers[] = {
 		seq_printf(m, fmt);	\
 })
 
-/*
- * The page dumper groups page table entries of the same type into a single
- * description. It uses pg_state to track the range information while
- * iterating over the pte entries. When the continuity is broken it then
- * dumps out a description of the range.
- */
-struct pg_state {
-	struct ptdump_state ptdump;
-	struct seq_file *seq;
-	const struct addr_marker *marker;
-	unsigned long start_address;
-	int level;
-	u64 current_prot;
-	bool check_wx;
-	unsigned long wx_pages;
-	unsigned long uxn_pages;
-};
-
-struct prot_bits {
-	u64		mask;
-	u64		val;
-	const char	*set;
-	const char	*clear;
-};
-
 static const struct prot_bits pte_bits[] = {
 	{
 		.mask	= PTE_VALID,
@@ -170,13 +145,6 @@ static const struct prot_bits pte_bits[] = {
 	}
 };
 
-struct pg_level {
-	const struct prot_bits *bits;
-	const char *name;
-	size_t num;
-	u64 mask;
-};
-
 static struct pg_level pg_level[] = {
 	{ /* pgd */
 		.name	= "PGD",
@@ -248,8 +216,8 @@ static void note_prot_wx(struct pg_state *st, unsigned long addr)
 	st->wx_pages += (addr - st->start_address) / PAGE_SIZE;
 }
 
-static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
-		      u64 val)
+void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
+	       u64 val)
 {
 	struct pg_state *st = container_of(pt_st, struct pg_state, ptdump);
 	static const char units[] = "KMGTPE";
-- 
2.44.0.rc0.258.g7320e95886-goog