linux-kernel - [PATCH v2] efi/arm: dump UEFI runtime page tables for ARM

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Date:   Fri, 30 Sep 2022 18:10:24 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Russell King <linux@...linux.org.uk>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v2] efi/arm: dump UEFI runtime page tables for ARM

UEFI runtime page tables dump only for ARM64 at present,
but ARM support EFI and ARM_PTDUMP_DEBUGFS now. Since
ARM could potentially execute with a 1G/3G user/kernel
split, choosing 1G as the upper limit for UEFI runtime
end, with this, we could enable UEFI runtime page tables.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
v2: update upper limit for ARM, only build test due to
    my qemu without UEFI boot support.
 arch/arm/include/asm/ptdump.h      | 1 +
 arch/arm64/include/asm/ptdump.h    | 1 +
 drivers/firmware/efi/arm-runtime.c | 4 ++--
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/ptdump.h b/arch/arm/include/asm/ptdump.h
index 0c2d3d0d4cc6..aad1d034136c 100644
--- a/arch/arm/include/asm/ptdump.h
+++ b/arch/arm/include/asm/ptdump.h
@@ -21,6 +21,7 @@ struct ptdump_info {
 
 void ptdump_walk_pgd(struct seq_file *s, struct ptdump_info *info);
 #ifdef CONFIG_ARM_PTDUMP_DEBUGFS
+#define EFI_RUNTIME_MAP_END	SZ_1G
 void ptdump_debugfs_register(struct ptdump_info *info, const char *name);
 #else
 static inline void ptdump_debugfs_register(struct ptdump_info *info,
diff --git a/arch/arm64/include/asm/ptdump.h b/arch/arm64/include/asm/ptdump.h
index b1dd7ecff7ef..581caac525b0 100644
--- a/arch/arm64/include/asm/ptdump.h
+++ b/arch/arm64/include/asm/ptdump.h
@@ -23,6 +23,7 @@ struct ptdump_info {
 
 void ptdump_walk(struct seq_file *s, struct ptdump_info *info);
 #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,
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 3359ae2adf24..8f8ae479061b 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -25,14 +25,14 @@
 #include <asm/mmu.h>
 #include <asm/pgalloc.h>
 
-#if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64)
+#if defined(CONFIG_PTDUMP_DEBUGFS) || defined(CONFIG_ARM_PTDUMP_DEBUGFS)
 #include <asm/ptdump.h>
 
 static struct ptdump_info efi_ptdump_info = {
 	.mm		= &efi_mm,
 	.markers	= (struct addr_marker[]){
 		{ 0,				"UEFI runtime start" },
-		{ DEFAULT_MAP_WINDOW_64,	"UEFI runtime end" },
+		{ EFI_RUNTIME_MAP_END,		"UEFI runtime end" },
 		{ -1,				NULL }
 	},
 	.base_addr	= 0,
-- 
2.35.3