linux-kernel - [PATCH] arm64: tegra: only map accessible sysram

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Message-Id: <20190929200851.14228-1-ykaukab@suse.de>
Date:   Sun, 29 Sep 2019 22:08:51 +0200
From:   Mian Yousaf Kaukab <ykaukab@...e.de>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, treding@...dia.com,
        jonathanh@...dia.com, linux-tegra@...r.kernel.org,
        Mian Yousaf Kaukab <ykaukab@...e.de>
Subject: [PATCH] arm64: tegra: only map accessible sysram

Most of the SysRAM is secure and only accessible by TF-A.
Don't map this inaccessible memory in kernel. Only map pages
used by bpmp driver.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@...e.de>
---
Only tegra186 is tested. Tested on Jetson TX2.

 arch/arm64/boot/dts/nvidia/tegra186.dtsi | 14 +++++++-------
 arch/arm64/boot/dts/nvidia/tegra194.dtsi | 14 +++++++-------
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
index 47cd831fcf44..a861f46125fd 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
@@ -1174,23 +1174,23 @@
 		power-domains = <&bpmp TEGRA186_POWER_DOMAIN_GPU>;
 	};
 
-	sysram@...00000 {
+	sysram@...4e000 {
 		compatible = "nvidia,tegra186-sysram", "mmio-sram";
-		reg = <0x0 0x30000000 0x0 0x50000>;
+		reg = <0x0 0x3004e000 0x0 0x2000>;
 		#address-cells = <2>;
 		#size-cells = <2>;
-		ranges = <0 0x0 0x0 0x30000000 0x0 0x50000>;
+		ranges = <0 0x0 0x0 0x3004e000 0x0 0x2000>;
 
-		cpu_bpmp_tx: shmem@...00 {
+		cpu_bpmp_tx: shmem@...0 {
 			compatible = "nvidia,tegra186-bpmp-shmem";
-			reg = <0x0 0x4e000 0x0 0x1000>;
+			reg = <0x0 0x0 0x0 0x1000>;
 			label = "cpu-bpmp-tx";
 			pool;
 		};
 
-		cpu_bpmp_rx: shmem@...00 {
+		cpu_bpmp_rx: shmem@...0 {
 			compatible = "nvidia,tegra186-bpmp-shmem";
-			reg = <0x0 0x4f000 0x0 0x1000>;
+			reg = <0x0 0x1000 0x0 0x1000>;
 			label = "cpu-bpmp-rx";
 			pool;
 		};
diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
index 3c0cf54f0aab..98b9399d6b7f 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
@@ -1430,23 +1430,23 @@
 			  0x82000000 0x0  0x40000000 0x1f 0x40000000 0x0 0xc0000000>; /* non-prefetchable memory (3GB) */
 	};
 
-	sysram@...00000 {
+	sysram@...4e000 {
 		compatible = "nvidia,tegra194-sysram", "mmio-sram";
-		reg = <0x0 0x40000000 0x0 0x50000>;
+		reg = <0x0 0x4004e000 0x0 0x2000>;
 		#address-cells = <1>;
 		#size-cells = <1>;
-		ranges = <0x0 0x0 0x40000000 0x50000>;
+		ranges = <0x0 0x0 0x4004e000 0x2000>;
 
-		cpu_bpmp_tx: shmem@...00 {
+		cpu_bpmp_tx: shmem@...0 {
 			compatible = "nvidia,tegra194-bpmp-shmem";
-			reg = <0x4e000 0x1000>;
+			reg = <0x0 0x1000>;
 			label = "cpu-bpmp-tx";
 			pool;
 		};
 
-		cpu_bpmp_rx: shmem@...00 {
+		cpu_bpmp_rx: shmem@...0 {
 			compatible = "nvidia,tegra194-bpmp-shmem";
-			reg = <0x4f000 0x1000>;
+			reg = <0x1000 0x1000>;
 			label = "cpu-bpmp-rx";
 			pool;
 		};
-- 
2.16.4