linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sm6350: Add Crypto Engine

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Message-Id: <CZ6FYZLGWT3K.ZBHYDQ7TDN4B@fairphone.com>
Date: Fri, 16 Feb 2024 11:46:49 +0100
From: "Luca Weiss" <luca.weiss@...rphone.com>
To: "Stephan Gerhold" <stephan@...hold.net>
Cc: "Andy Gross" <agross@...nel.org>, "Bjorn Andersson"
 <andersson@...nel.org>, "Konrad Dybcio" <konrad.dybcio@...aro.org>, "Thara
 Gopinath" <thara.gopinath@...il.com>, "Herbert Xu"
 <herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net>,
 "Rob Herring" <robh+dt@...nel.org>, "Krzysztof Kozlowski"
 <krzysztof.kozlowski+dt@...aro.org>, "Conor Dooley" <conor+dt@...nel.org>,
 "Bhupesh Sharma" <bhupesh.sharma@...aro.org>,
 <~postmarketos/upstreaming@...ts.sr.ht>, <phone-devel@...r.kernel.org>,
 <linux-crypto@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm6350: Add Crypto Engine

On Fri Jan 5, 2024 at 5:30 PM CET, Stephan Gerhold wrote:
> On Fri, Jan 05, 2024 at 05:15:44PM +0100, Luca Weiss wrote:
> > Add crypto engine (CE) and CE BAM related nodes and definitions for this
> > SoC.
> > 
> > For reference:
> > 
> >   [    2.297419] qcrypto 1dfa000.crypto: Crypto device found, version 55.1
> > 
> > Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> > ---
> >  arch/arm64/boot/dts/qcom/sm6350.dtsi | 31 +++++++++++++++++++++++++++++++
> >  1 file changed, 31 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sm6350.dtsi b/arch/arm64/boot/dts/qcom/sm6350.dtsi
> > index 8fd6f4d03490..516aadbb16bb 100644
> > --- a/arch/arm64/boot/dts/qcom/sm6350.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm6350.dtsi
> > @@ -1212,6 +1212,37 @@ ufs_mem_phy_lanes: phy@...7400 {
> >  			};
> >  		};
> >  
> > +		cryptobam: dma-controller@...4000 {
> > +			compatible = "qcom,bam-v1.7.4", "qcom,bam-v1.7.0";
> > +			reg = <0 0x01dc4000 0 0x24000>;
> > +			interrupts = <GIC_SPI 272 IRQ_TYPE_LEVEL_HIGH>;
> > +			#dma-cells = <1>;
> > +			qcom,ee = <0>;
> > +			qcom,controlled-remotely;
> > +			num-channels = <16>;
> > +			qcom,num-ees = <4>;
> > +			iommus = <&apps_smmu 0x432 0x0000>,
> > +				 <&apps_smmu 0x438 0x0001>,
> > +				 <&apps_smmu 0x43f 0x0000>,
> > +				 <&apps_smmu 0x426 0x0011>,
> > +				 <&apps_smmu 0x436 0x0011>;
>
> The last two lines look equivalent to me: 0x436 & ~0x0011 = 0x426.

I don't understand the IOMMU SID + mask really, but I think I've seen
somewhere before like here that TZ can be a bit picky with the SIDs?

https://lore.kernel.org/linux-arm-msm/opqdrmyj3y64nqqqmakjydn5rkspizufyeavm7ec7c7ufqz4wk@ey2a7bq3shfj/
https://lore.kernel.org/linux-arm-msm/11b5db69-49f5-4d7b-81c9-687d66a5cb0d@linaro.org/

I don't quite want to risk having some obscure use case breaking because
we cleaned up the dts ;)

But if you're more sure than me that it won't break, let me know!

>
> It's also a bit weird that the mask has one more digit than the stream
> ID. And ordered numerically (by stream ID, first number) it would be a
> bit easier to read. :-)

Sorting them is no problem, can do that for v2.

>
> Thanks,
> Stephan