linux-kernel - Re: [PATCH v2 1/4] dt-bindings: firmware: qcom,scm: Document that SCM can be dma-coherent

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <23cecdde-2b24-a472-1497-5da9f1158c00@linaro.org>
Date:   Mon, 19 Jun 2023 12:00:07 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Douglas Anderson <dianders@...omium.org>, andersson@...nel.org
Cc:     amit.pundir@...aro.org, Will Deacon <will@...nel.org>,
        sumit.semwal@...aro.org, linux-arm-msm@...r.kernel.org,
        konrad.dybcio@...ainline.org, linux-arm-kernel@...ts.infradead.org,
        Stephan Gerhold <stephan@...hold.net>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Nikita Travkin <nikita@...n.ru>,
        Stephen Boyd <swboyd@...omium.org>,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Das Srinagesh <quic_gurus@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Robert Marko <robimarko@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: firmware: qcom,scm: Document that SCM
 can be dma-coherent

On 18.06.2023 10:07, Krzysztof Kozlowski wrote:
> On 16/06/2023 17:14, Douglas Anderson wrote:
>> Trogdor devices use firmware backed by TF-A instead of Qualcomm's
>> normal TZ. On TF-A we end up mapping memory as cacheable. Specifically,
>> you can see in Trogdor's TF-A code [1] in qti_sip_mem_assign() that we
>> call qti_mmap_add_dynamic_region() with MT_RO_DATA. This translates
>> down to MT_MEMORY instead of MT_NON_CACHEABLE or MT_DEVICE.
>>
>> Let's allow devices like trogdor to be described properly by allowing
>> "dma-coherent" in the SCM node.
>>
>> Signed-off-by: Douglas Anderson <dianders@...omium.org
> 
> 2
Forgot to press alt or something

Konrad
> 
> Best regards,
> Krzysztof
>