linux-kernel - RE: [PATCH 1/2] dt-bindings: fpga: Add compatible value for Xilinx DFX AXI shutdown manger

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: <MWHPR02MB26230314CDC7179841CDC585C2A30@MWHPR02MB2623.namprd02.prod.outlook.com>
Date:   Tue, 19 Jan 2021 06:09:45 +0000
From:   Nava kishore Manne <navam@...inx.com>
To:     Tom Rix <trix@...hat.com>, "mdf@...nel.org" <mdf@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Michal Simek <michals@...inx.com>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     git <git@...inx.com>,
        "chinnikishore369@...il.com" <chinnikishore369@...il.com>
Subject: RE: [PATCH 1/2] dt-bindings: fpga: Add compatible value for Xilinx
 DFX AXI shutdown manger

Hi Tom,

	Thanks for the review.
Please find my response inline.

> -----Original Message-----
> From: Tom Rix <trix@...hat.com>
> Sent: Friday, January 15, 2021 11:37 PM
> To: Nava kishore Manne <navam@...inx.com>; mdf@...nel.org;
> robh+dt@...nel.org; Michal Simek <michals@...inx.com>; linux-
> fpga@...r.kernel.org; devicetree@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
> Cc: git <git@...inx.com>; chinnikishore369@...il.com
> Subject: Re: [PATCH 1/2] dt-bindings: fpga: Add compatible value for Xilinx
> DFX AXI shutdown manger
> 
> 
> On 1/14/21 5:34 PM, Nava kishore Manne wrote:
> > This patch Adds compatible value for Xilinx Dynamic Function
> > eXchnage(DFX) AXI Shutdown manager IP.
> 
> A multi patch set should have a cover letter.
> 
> Use git format-patch --cover-letter
> 

Will  fix in v2.

> > Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> > ---
> >  .../bindings/fpga/xilinx-pr-decoupler.txt     | 19 ++++++++++++++++---
> >  1 file changed, 16 insertions(+), 3 deletions(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
> > b/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
> > index 4284d293fa61..42fca058a5f4 100644
> > --- a/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
> > +++ b/Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt
> > @@ -7,13 +7,26 @@ changes from passing through the bridge.  The
> > controller can also  couple / enable the bridges which allows traffic
> > to pass through the  bridge normally.
> Below is some wordsmithing to make the compatibility explicit and remove
> unneeded words

Will fix in v2

> >
> > +Xilinx LogiCORE Dynamic Function eXchange(DFX) AXI shutdown manager
> > +Softcore
> is compatible with the Xilinx LogiCORE pr-decoupler.

Yes, Both IP's are compatible with respect to the IP registers spec.

> > +
> > +The Xilinx LogiCORE Dynamic Function eXchange(DFX) AXI shutdown
> > +manager manages one or more shutdown managers / fpga bridges.
> > +The controller can shutdown/passthrough the bridges which prevents
> 
> Delete 4 lines above.
> 

Will fix in v2.

> The DFX AXI shutdown manager prevents
> 

Will fix in v2.

> > +AXI traffic from passing through the bridge. The controller safely
> > +handles AXI4MM and AXI4-Lite interfaces on a Reconfigurable Partition
> > +when it is undergoing dynamic reconfiguration (DFX), preventing
> > +system
> 
> I don't know about the use of '(DFX)' here, above it is Dynamic Function
> eXchange'
> 
> Here it is dynamic reconfiguration, maybe just delete the '(DFX)'
> 


Will fix in v2.

> > +deadlock that can occur if AXI transactions are interrupted by DFX
> > +
> >  The Driver supports only MMIO handling. A PR region can have multiple
> > -PR Decouplers which can be handled independently or chained via
> > decouple/ -decouple_status signals.
> > +PR Decouplers/AXI shutdown manager which can be handled
> independently
> > +or chained via decouple/ decouple_status signals.
> Being compatible, i don't think it is necessary to add to / change this section.
> >
> >  Required properties:
> >  - compatible		: Should contain "xlnx,pr-decoupler-1.00" followed
> by
> > -                          "xlnx,pr-decoupler"
> > +                          "xlnx,pr-decoupler" or
> > +			  "xlnx,dfx-axi-shutdown-manager-1.00" followed by
> > +			  "xlnx,dfx-axi-shutdown-manager"
> >  - regs			: base address and size for decoupler module
> >  - clocks		: input clock to IP
> >  - clock-names		: should contain "aclk"
> 
> Adding an example similar to the existing would be helpful.
> 

Will fix in v2.

Regards,
Navakishore.