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

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Message-ID: <20250613111153.1548928-4-suzuki.poulose@arm.com>
Date: Fri, 13 Jun 2025 12:11:53 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: will@...nel.org,
	catalin.marinas@....com,
	sami.mujawar@....com,
	aneesh.kumar@...nel.org,
	steven.price@....com,
	linux-kernel@...r.kernel.org,
	sudeep.holla@....com,
	Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH 3/3] arm64: acpi: Enable ACPI CCEL support

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

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