linux-kernel - [PATCH 4/4] arm64: tegra194: add reserved-only flag in sysram node

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Message-Id: <20200512144803.24344-4-ykaukab@suse.de>
Date:   Tue, 12 May 2020 16:48:03 +0200
From:   Mian Yousaf Kaukab <ykaukab@...e.de>
To:     swarren@...dotorg.org, robh+dt@...nel.org, robin.murphy@....com
Cc:     devicetree@...r.kernel.org, talho@...dia.com,
        thierry.reding@...il.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, afaerber@...e.de,
        arnd@...db.de, gregkh@...uxfoundation.org,
        Mian Yousaf Kaukab <ykaukab@...e.de>
Subject: [PATCH 4/4] arm64: tegra194: add reserved-only flag in sysram node

bpmp driver has reserved regions in sysram. Since sysram is only used
by the bpmp driver, add ‘reserved-only’ flag to the sysram node so
that only regions used by the bpmp driver are remapped. Other regions
of the sysram may not be accessible to the kernel and a speculative
access to them can cause SError.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@...e.de>
---
 arch/arm64/boot/dts/nvidia/tegra194.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
index e1ae01c2d039..9a5276d9c2a6 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
@@ -1743,6 +1743,7 @@ sysram@...00000 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x0 0x0 0x40000000 0x50000>;
+		reserved-only;
 
 		cpu_bpmp_tx: shmem@...00 {
 			compatible = "nvidia,tegra194-bpmp-shmem";
-- 
2.25.0