linux-kernel - Re: [PATCHv1 3/4] dt-bindings: fpga: add authenticate-fpga-config property

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Message-ID: <20201116024758.GA6810@yilunxu-OptiPlex-7050>
Date:   Mon, 16 Nov 2020 10:47:58 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     richard.gong@...ux.intel.com, trix@...hat.com,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        dinguyen@...nel.org, sridhar.rajagopal@...el.com,
        Richard Gong <richard.gong@...el.com>, yilun.xu@...el.com
Subject: Re: [PATCHv1 3/4] dt-bindings: fpga: add authenticate-fpga-config
  property

On Sun, Nov 15, 2020 at 11:21:06AM -0800, Moritz Fischer wrote:
> Hi Richard,
> 
> On Thu, Nov 12, 2020 at 12:06:42PM -0600, richard.gong@...ux.intel.com wrote:
> > From: Richard Gong <richard.gong@...el.com>
> > 
> > Add authenticate-fpga-config property for FPGA bitstream authentication.
> > 
> > Signed-off-by: Richard Gong <richard.gong@...el.com>
> > ---
> >  Documentation/devicetree/bindings/fpga/fpga-region.txt | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/fpga/fpga-region.txt b/Documentation/devicetree/bindings/fpga/fpga-region.txt
> > index e811cf8..7a512bc 100644
> > --- a/Documentation/devicetree/bindings/fpga/fpga-region.txt
> > +++ b/Documentation/devicetree/bindings/fpga/fpga-region.txt
> > @@ -187,6 +187,7 @@ Optional properties:
> >  - external-fpga-config : boolean, set if the FPGA has already been configured
> >  	prior to OS boot up.
> >  - encrypted-fpga-config : boolean, set if the bitstream is encrypted
> > +- authenticate-fpga-config : boolean, set if do bitstream authentication
> It is unclear to me from the description whether this entails
> authentication + reconfiguration or just authentication.
> 
> If the latter is the case this should probably be described as such.

If it is just authentication, do we still need to disable bridges in
fpga_region_program_fpga?

I'm wondering if the FPGA functionalities could still be working when
the authenticating is ongoing, or when the authenticating is failed.

Thanks,
Yilun

> 
> >  - region-unfreeze-timeout-us : The maximum time in microseconds to wait for
> >  	bridges to successfully become enabled after the region has been
> >  	programmed.
> > -- 
> > 2.7.4
> > 
> 
> Thanks