linux-kernel - Re: [PATCH v7 3/4] misc: fastrpc: Add support for new DSP IOVA formatting

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: <hvjbohxvyogsxkt2wrzdlzlbodjtqybyxyt7bbp67xq7qbs4iy@atbtkdltnhzp>
Date: Sat, 27 Dec 2025 19:16:23 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
Cc: kpallavi@....qualcomm.com, srini@...nel.org, amahesh@....qualcomm.com,
        arnd@...db.de, gregkh@...uxfoundation.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, quic_bkumar@...cinc.com,
        ekansh.gupta@....qualcomm.com, linux-kernel@...r.kernel.org,
        quic_chennak@...cinc.com, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        jingyi.wang@....qualcomm.com, aiqun.yu@....qualcomm.com,
        ktadakam@....qualcomm.com
Subject: Re: [PATCH v7 3/4] misc: fastrpc: Add support for new DSP IOVA
 formatting

On Fri, Dec 26, 2025 at 12:35:33PM +0530, Kumari Pallavi wrote:
> Implement the new IOVA formatting required by the DSP architecture change
> on Kaanapali SoC. Place the SID for DSP DMA transactions at bit 56 in the
> physical address. This placement is necessary for the DSPs to correctly
> identify streams and operate as intended.
> To address this, set SID position to bit 56 via OF matching on the fastrpc
> node; otherwise, default to legacy 32-bit placement.
> This change ensures consistent SID placement across DSPs.
> 
> Signed-off-by: Kumari Pallavi <kumari.pallavi@....qualcomm.com>
> ---
>  drivers/misc/fastrpc.c | 62 ++++++++++++++++++++++++++++++++++--------
>  1 file changed, 51 insertions(+), 11 deletions(-)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry