linux-kernel - Re: [PATCH 2/4] firmware: qcom: scm: add iommu scm calls for pg table

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Date:   Thu, 25 Aug 2016 12:08:31 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     "Gupta, Puja" <pujag@...eaurora.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Andy Gross <andy.gross@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Rob Clark <robdclark@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/4] firmware: qcom: scm: add iommu scm calls for pg table

Hi Puja,

On 08/24/2016 09:35 PM, Gupta, Puja wrote:
> On 8/19/2016 8:53 AM, Stanimir Varbanov wrote:
>> Those two scm calls are used to get the size of secure iommu
>> page table and to pass physical memory address for this page
>> table. The calls are used by remoteproc venus driver to load
>> the firmware.

> Do we really need these additional scm calls for venus? why can't we
> just reuse existing __qcom_scm_pas_mem_setup() call?

We are using __qcom_scm_pas_mem_setup() but it will return error if I
did not provide page table memory. At least for apq8016 this step looks
like is mandatory.

Do you have some idea how those iommu calls can be avoided?

-- 
regards,
Stan