[PATCH 3/3] arm64: acpi: Enable ACPI CCEL support
From: Suzuki K Poulose
Date: Fri Jun 13 2025 - 07:13:00 EST
ACPI CCEL memory area is reported as Non-Volatile storage area. Map it as
PAGE_KERNEL.
Cc: Sami Mujawar <sami.mujawar@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxx>
Cc: Steven Price <steven.price@xxxxxxx>
Cc: Sudeep Holla <sudeep.holla@xxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
---
arch/arm64/kernel/acpi.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index b9a66fc146c9..f52439d411a0 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -356,6 +356,11 @@ void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
prot = PAGE_KERNEL_RO;
break;
+ case EFI_ACPI_MEMORY_NVS:
+ /* Non-volatile storage, required for CCEL */
+ prot = PAGE_KERNEL;
+ break;
+
case EFI_ACPI_RECLAIM_MEMORY:
/*
* ACPI reclaim memory is used to pass firmware tables
--
2.43.0