* [PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries
@ 2026-10-16 5:20 Abhinav Parihar
2026-10-16 8:45 ` Konrad Dybcio
2026-10-16 10:03 ` Ekansh Gupta
0 siblings, 2 replies; 3+ messages in thread
From: Abhinav Parihar @ 2026-10-16 5:20 UTC (permalink / raw)
To: srinivas.kandagatla, linux-arm-msm
Cc: Abhinav Parihar, gregkh, quic_bkumar, ekansh.gupta, linux-kernel,
quic_chennak, dri-devel, arnd
Context bank 9 is reserved for secure use cases and must not be exposed
as a FastRPC compute context bank for non-secure offloading.
Remove the compute-cb@9 nodes from the Lemans and Monaco device trees to
prevent clients from selecting a secure context bank for normal FastRPC
workloads.
Secure use case support is not currently implemented upstream.
Signed-off-by: Abhinav Parihar <abhinav.parihar@oss.qualcomm.com>
---
arch/arm64/boot/dts/qcom/lemans.dtsi | 16 ----------------
arch/arm64/boot/dts/qcom/monaco.dtsi | 7 -------
2 files changed, 23 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/lemans.dtsi b/arch/arm64/boot/dts/qcom/lemans.dtsi
index 695eae1b7256..5481dfb73454 100644
--- a/arch/arm64/boot/dts/qcom/lemans.dtsi
+++ b/arch/arm64/boot/dts/qcom/lemans.dtsi
@@ -7861,14 +7861,6 @@ compute-cb@8 {
dma-coherent;
};
- compute-cb@9 {
- compatible = "qcom,fastrpc-compute-cb";
- reg = <9>;
- iommus = <&apps_smmu 0x2149 0x04a0>,
- <&apps_smmu 0x2189 0x0400>;
- dma-coherent;
- };
-
compute-cb@11 {
compatible = "qcom,fastrpc-compute-cb";
reg = <11>;
@@ -8000,14 +7992,6 @@ compute-cb@8 {
dma-coherent;
};
- compute-cb@9 {
- compatible = "qcom,fastrpc-compute-cb";
- reg = <9>;
- iommus = <&apps_smmu 0x2949 0x04a0>,
- <&apps_smmu 0x2989 0x0400>;
- dma-coherent;
- };
-
compute-cb@10 {
compatible = "qcom,fastrpc-compute-cb";
reg = <10>;
diff --git a/arch/arm64/boot/dts/qcom/monaco.dtsi b/arch/arm64/boot/dts/qcom/monaco.dtsi
index cfe39f923224..e73a735f2f13 100644
--- a/arch/arm64/boot/dts/qcom/monaco.dtsi
+++ b/arch/arm64/boot/dts/qcom/monaco.dtsi
@@ -7822,13 +7822,6 @@ compute-cb@8 {
dma-coherent;
};
- compute-cb@9 {
- compatible = "qcom,fastrpc-compute-cb";
- reg = <9>;
- iommus = <&apps_smmu 0x19c9 0x0400>;
- dma-coherent;
- };
-
compute-cb@11 {
compatible = "qcom,fastrpc-compute-cb";
reg = <0xb>;
--
2.34.1
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries
2026-10-16 5:20 [PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries Abhinav Parihar
@ 2026-10-16 8:45 ` Konrad Dybcio
2026-10-16 10:03 ` Ekansh Gupta
1 sibling, 0 replies; 3+ messages in thread
From: Konrad Dybcio @ 2026-10-16 8:45 UTC (permalink / raw)
To: Abhinav Parihar, srinivas.kandagatla, linux-arm-msm
Cc: gregkh, quic_bkumar, ekansh.gupta, linux-kernel, quic_chennak,
dri-devel, arnd
On 10/16/26 7:20 AM, Abhinav Parihar wrote:
> Context bank 9 is reserved for secure use cases and must not be exposed
> as a FastRPC compute context bank for non-secure offloading.
The lack of a platform name in the commit message and a split over that
suggests this is a universal truth for all Qualcomm platforms, yet the
patch only limits this to some of those who currently define a cb@9.
Please make it more clear which one is intended.
> Remove the compute-cb@9 nodes from the Lemans and Monaco device trees to
> prevent clients from selecting a secure context bank for normal FastRPC
> workloads.
>
> Secure use case support is not currently implemented upstream.
Ordering this sentence before the previous paragraph would make the
commit message read more naturally
Konrad
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries
2026-10-16 5:20 [PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries Abhinav Parihar
2026-10-16 8:45 ` Konrad Dybcio
@ 2026-10-16 10:03 ` Ekansh Gupta
1 sibling, 0 replies; 3+ messages in thread
From: Ekansh Gupta @ 2026-10-16 10:03 UTC (permalink / raw)
To: Abhinav Parihar, srinivas.kandagatla, linux-arm-msm
Cc: gregkh, quic_bkumar, linux-kernel, quic_chennak, dri-devel, arnd
On 16-10-2026 10:50, Abhinav Parihar wrote:
> Context bank 9 is reserved for secure use cases and must not be exposed
> as a FastRPC compute context bank for non-secure offloading.
>
> Remove the compute-cb@9 nodes from the Lemans and Monaco device trees to
> prevent clients from selecting a secure context bank for normal FastRPC
> workloads.
>
> Secure use case support is not currently implemented upstream.
>
can you add Fixes: tag as well?> Signed-off-by: Abhinav Parihar
<abhinav.parihar@oss.qualcomm.com>
> ---
> arch/arm64/boot/dts/qcom/lemans.dtsi | 16 ----------------
> arch/arm64/boot/dts/qcom/monaco.dtsi | 7 -------
separate the patch both different platforms, also please include other
applicable platforms in your next spin> 2 files changed, 23 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/lemans.dtsi b/arch/arm64/boot/dts/qcom/lemans.dtsi
> index 695eae1b7256..5481dfb73454 100644
> --- a/arch/arm64/boot/dts/qcom/lemans.dtsi
> +++ b/arch/arm64/boot/dts/qcom/lemans.dtsi
> @@ -7861,14 +7861,6 @@ compute-cb@8 {
> dma-coherent;
> };
>
> - compute-cb@9 {
> - compatible = "qcom,fastrpc-compute-cb";
> - reg = <9>;
> - iommus = <&apps_smmu 0x2149 0x04a0>,
> - <&apps_smmu 0x2189 0x0400>;
> - dma-coherent;
> - };
> -
> compute-cb@11 {
> compatible = "qcom,fastrpc-compute-cb";
> reg = <11>;
> @@ -8000,14 +7992,6 @@ compute-cb@8 {
> dma-coherent;
> };
>
> - compute-cb@9 {
> - compatible = "qcom,fastrpc-compute-cb";
> - reg = <9>;
> - iommus = <&apps_smmu 0x2949 0x04a0>,
> - <&apps_smmu 0x2989 0x0400>;
> - dma-coherent;
> - };
> -
> compute-cb@10 {
> compatible = "qcom,fastrpc-compute-cb";
> reg = <10>;
> diff --git a/arch/arm64/boot/dts/qcom/monaco.dtsi b/arch/arm64/boot/dts/qcom/monaco.dtsi
> index cfe39f923224..e73a735f2f13 100644
> --- a/arch/arm64/boot/dts/qcom/monaco.dtsi
> +++ b/arch/arm64/boot/dts/qcom/monaco.dtsi
> @@ -7822,13 +7822,6 @@ compute-cb@8 {
> dma-coherent;
> };
>
> - compute-cb@9 {
> - compatible = "qcom,fastrpc-compute-cb";
> - reg = <9>;
> - iommus = <&apps_smmu 0x19c9 0x0400>;
> - dma-coherent;
> - };
> -
> compute-cb@11 {
> compatible = "qcom,fastrpc-compute-cb";
> reg = <0xb>;
^ permalink raw reply [flat|nested] 3+ messages in thread
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2026-10-16 5:20 [PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries Abhinav Parihar
2026-10-16 8:45 ` Konrad Dybcio
2026-10-16 10:03 ` Ekansh Gupta
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