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

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Date: Fri, 16 Feb 2024 12:09:11 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: Stephan Gerhold <stephan@...hold.net>, Andy Gross <agross@...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, Feb 16, 2024 at 11:46:49AM +0100, Luca Weiss wrote:
> 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 5.5.1
> > > 
> > > 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.
> 

Where you able to do this? I don't see a v2 in my inbox, am I just
searching poorly?

Regards,
Bjorn

> >
> > Thanks,
> > Stephan
>