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Message-Id: <20251020-sdm845-use-guard-pages-v1-1-64d714f8bd73@ixit.cz>
Date: Mon, 20 Oct 2025 23:12:56 +0200
From: David Heidelberg via B4 Relay <devnull+david.ixit.cz@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Paul Sajna <sajattack@...tmarketos.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
David Heidelberg <david@...t.cz>
Subject: [PATCH] arm64: dts: qcom: sdm845: Define guard pages within the
rmtfs region
From: David Heidelberg <david@...t.cz>
Use qcom,use-guard-pages property instead of polluting device-tree with
lower and upper rmtfs guard nodes.
No functional change intended.
cosmetic: set name the node rmtfs-region.
Signed-off-by: David Heidelberg <david@...t.cz>
---
Tested on OnePlus 6T.
---
arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi | 17 +++--------------
arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi | 18 +++---------------
2 files changed, 6 insertions(+), 29 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi
index 99dafc6716e76..83b98bad19dd2 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi
@@ -99,26 +99,15 @@ memory@...00000 {
no-map;
};
- /* rmtfs lower guard */
- memory@...00000 {
- reg = <0 0xf0800000 0 0x1000>;
- no-map;
- };
-
- rmtfs_mem: memory@...01000 {
+ rmtfs_mem: rmtfs-region@...00000 {
compatible = "qcom,rmtfs-mem";
- reg = <0 0xf0801000 0 0x200000>;
+ reg = <0 0xf0800000 0 0x202000>;
+ qcom,use-guard-pages;
no-map;
qcom,client-id = <1>;
qcom,vmid = <QCOM_SCM_VMID_MSS_MSA>;
};
-
- /* rmtfs upper guard */
- memory@...01000 {
- reg = <0 0xf0a01000 0 0x1000>;
- no-map;
- };
};
gpio-keys {
diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
index dcfffb271fcf3..61d63003fa371 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
@@ -75,32 +75,20 @@ key-vol-up {
};
reserved-memory {
- /*
- * The rmtfs_mem needs to be guarded due to "XPU limitations"
- * it is otherwise possible for an allocation adjacent to the
- * rmtfs_mem region to trigger an XPU violation, causing a crash.
- */
- rmtfs_lower_guard: rmtfs-lower-guard@...00000 {
- no-map;
- reg = <0 0xf5b00000 0 0x1000>;
- };
/*
* The rmtfs memory region in downstream is 'dynamically allocated'
* but given the same address every time. Hard code it as this address is
* where the modem firmware expects it to be.
*/
- rmtfs_mem: rmtfs-mem@...01000 {
+ rmtfs_mem: rmtfs-region@...00000 {
compatible = "qcom,rmtfs-mem";
- reg = <0 0xf5b01000 0 0x200000>;
+ reg = <0 0xf5b00000 0 0x202000>;
+ qcom,use-guard-pages;
no-map;
qcom,client-id = <1>;
qcom,vmid = <QCOM_SCM_VMID_MSS_MSA>;
};
- rmtfs_upper_guard: rmtfs-upper-guard@...01000 {
- no-map;
- reg = <0 0xf5d01000 0 0x1000>;
- };
/*
* It seems like reserving the old rmtfs_mem region is also needed to prevent
---
base-commit: 606da5bb165594c052ee11de79bf05bc38bc1aa6
change-id: 20251020-sdm845-use-guard-pages-9c2b2fa0b71e
Best regards,
--
David Heidelberg <david@...t.cz>
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