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boundary="===============0166090039321826061==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============0166090039321826061== Content-Type: multipart/alternative; boundary="000000000000dcc52405c31233cf" --000000000000dcc52405c31233cf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 8 Jan 2020 at 09:16, Will Deacon wrote: > On Thu, Dec 26, 2019 at 02:17:06PM -0800, Bjorn Andersson wrote: > > These patches implements the stream mapping inheritance that's necessar= y > in > > order to not hit a security violation as the display hardware looses it= s > stream > > mapping during initialization of arm-smmu in various Qualcomm platforms= . > > > > This was previously posted as an RFC [1], changes since then involves t= he > > rebase and migration of the read-back code to the Qualcomm specific > > implementation, the mapping is maintained indefinitely - to handle prob= e > > deferring clients - and rewritten commit messages. > > I don't think we should solve this in a Qualcomm-specific manner. Please > can > you take a look at the proposal from Thierry [1] and see whether or not i= t > works for you? > Did this or Thierry's solution ever gain traction? Or are all the parties still 'solving' this downstream? > Thanks, > > Will > > [1] > https://lore.kernel.org/lkml/20191209150748.2471814-1-thierry.reding@gmai= l.com > --=20 Lee Jones [=E6=9D=8E=E7=90=BC=E6=96=AF] Linaro Services Senior Technical Lead Linaro.org =E2=94=82 Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog --000000000000dcc52405c31233cf Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Wed, 8 Jan 2020 at 09:16, Will Deacon = <will@kernel.org> wrote:
On Thu, Dec 26, 2019 at 02:17:06PM -0800, Bjorn Andersson wrote:
> These patches implements the stream mapping inheritance that's nec= essary in
> order to not hit a security violation as the display hardware looses i= ts stream
> mapping during initialization of arm-smmu in various Qualcomm platform= s.
>
> This was previously posted as an RFC [1], changes since then involves = the
> rebase and migration of the read-back code to the Qualcomm specific > implementation, the mapping is maintained indefinitely - to handle pro= be
> deferring clients - and rewritten commit messages.

I don't think we should solve this in a Qualcomm-specific manner. Pleas= e can
you take a look at the proposal from Thierry [1] and see whether or not it<= br> works for you?

Did this or=C2=A0Thierry= 's solution ever gain traction?

Or are all the= parties still 'solving' this downstream?
=C2=A0
Thanks,

Will

[1] https://lore.kerne= l.org/lkml/20191209150748.2471814-1-thierry.reding@gmail.com


--
Lee Jones [=E6=9D=8E=E7=90=BC=E6=96=AF]
Linaro Services Senior Tec= hnical Lead
Linaro.org = =E2=94=82 Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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