[PATCH 3/3] arm64: acpi: Enable ACPI CCEL support

[Suzuki K Poulose]

ACPI CCEL memory area is reported as Non-Volatile storage area. Map it as
PAGE_KERNEL.

Cc: Sami Mujawar <sami.mujawar at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar at kernel.org>
Cc: Steven Price <steven.price at arm.com>
Cc: Sudeep Holla <sudeep.holla at arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
---
 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