linux-kernel - [PATCH] loongarch: Disable FIX_EARLYCON_MEM when ARCH

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Message-Id: <20250102-la-earlycon-fixed-map-v1-1-23fe3a6681c4@flygoat.com>
Date: Thu, 02 Jan 2025 14:34:40 +0000
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>
Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH] loongarch: Disable FIX_EARLYCON_MEM when ARCH_IOREMAP is
 enabled

When ARCH_IOREMAP is enabled, we are using always accessible DMW
for ioremap. It makes no sense to create a dedicated mapping for
earlycon given that we can access the region via DMW.

Disable FIX_EARLYCON_MEM when ARCH_IOREMAP is selected. This can
ease debugging for early mapping issues.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/loongarch/Kconfig              | 2 +-
 arch/loongarch/include/asm/fixmap.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 1c4d13aa677e2e04b9791882fba7523f93d6a69d..ad8a8cf75343799ea626be52f521fa75e7cbe07b 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -246,7 +246,7 @@ config MACH_LOONGSON64
 	def_bool 64BIT
 
 config FIX_EARLYCON_MEM
-	def_bool y
+	def_bool !ARCH_IOREMAP
 
 config PGTABLE_2LEVEL
 	bool
diff --git a/arch/loongarch/include/asm/fixmap.h b/arch/loongarch/include/asm/fixmap.h
index d2e55ae55bb9c499b9a685509bc26d663054b58e..905dc7a5f9fa52ac924fe832749f39283c28a9f8 100644
--- a/arch/loongarch/include/asm/fixmap.h
+++ b/arch/loongarch/include/asm/fixmap.h
@@ -12,7 +12,9 @@
 
 enum fixed_addresses {
 	FIX_HOLE,
+#ifdef CONFIG_FIX_EARLYCON_MEM
 	FIX_EARLYCON_MEM_BASE,
+#endif
 	__end_of_fixed_addresses
 };
 

---
base-commit: 8155b4ef3466f0e289e8fcc9e6e62f3f4dceeac2
change-id: 20250102-la-earlycon-fixed-map-d6a48bd5b831

Best regards,
-- 
Jiaxun Yang <jiaxun.yang@...goat.com>