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

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Message-ID: <20160830211532.GE24683@hector.attlocal.net>
Date:   Tue, 30 Aug 2016 16:15:32 -0500
From:   Andy Gross <andy.gross@...aro.org>
To:     "Gupta, Puja" <pujag@...eaurora.org>
Cc:     Stanimir Varbanov <stanimir.varbanov@...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>,
        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

On Wed, Aug 24, 2016 at 11:35:29AM -0700, 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?

Keep in mind this is with the smmu-v1 on 8916.  It seems like the downstream
kernel has to do extra stuff when dealing with the older smmu.  The newer
platforms handle this quasi-transparently.

Regards,

Andy