linux-kernel - Re: [PATCH 7/7] arm64: dts: qcom: sm8650: Add hwlock to remoteproc

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Date: Wed, 22 May 2024 10:51:57 -0700
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: Chris Lew <quic_clew@...cinc.com>, Bjorn Andersson <andersson@...nel.org>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Peter Zijlstra
	<peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
        Will Deacon
	<will@...nel.org>, Waiman Long <longman@...hat.com>,
        Boqun Feng
	<boqun.feng@...il.com>, Jonathan Corbet <corbet@....net>,
        Mathieu Poirier
	<mathieu.poirier@...aro.org>,
        Rob Herring <robh@...nel.org>,
        "Krzysztof
 Kozlowski" <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 7/7] arm64: dts: qcom: sm8650: Add hwlock to remoteproc

On Wed, May 22, 2024 at 09:27:29AM +0200, Krzysztof Kozlowski wrote:
> On 17/05/2024 00:58, Chris Lew wrote:
> > Add the hwlock property to remoteproc. This enables the remoteproc to
> > try and bust the smem hwspinlock if the remoteproc has crashed while
> > holding the hwspinlock.
> > 
> > Signed-off-by: Chris Lew <quic_clew@...cinc.com>
> > ---
> >  arch/arm64/boot/dts/qcom/sm8650.dtsi | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi b/arch/arm64/boot/dts/qcom/sm8650.dtsi
> > index 62a6e77730bc..a65a1679f003 100644
> > --- a/arch/arm64/boot/dts/qcom/sm8650.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
> > @@ -2878,6 +2878,7 @@ remoteproc_mpss: remoteproc@...0000 {
> >  
> >  			qcom,smem-states = <&smp2p_modem_out 0>;
> >  			qcom,smem-state-names = "stop";
> > +			hwlocks = <&tcsr_mutex 3>;
> 
> lock #3 is used by smem, so this proves you are taking someone else's
> lock.

The lock is a shared resource, it's not "some else's lock".

Regards,
Bjorn

> I commented on this in the binding, but let's be specific:
> 
> NAK, please carry:
> 
> Nacked-by: Krzysztof Kozlowski <krzk@...nel.org>
> 
> Best regards,
> Krzysztof
>