[PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries

[PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries

[Abhinav Parihar]

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

Re: [PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries

[Konrad Dybcio]

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

Re: [PATCH v1] arm64: dts: qcom: Remove FastRPC compute CB9 entries

[Ekansh Gupta]

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>;