linux-kernel - Re: [PATCH v2] media: venus: vdec: restrict EOS addr quirk to IRIS2 only

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: <CAO9ioeVKDjKMh3su2XVwXPxjfZNbVSan73d099C6_vkCqjkJmA@mail.gmail.com>
Date: Wed, 26 Nov 2025 10:43:44 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
Cc: Vikash Garodia <vikash.garodia@....qualcomm.com>,
        "Bryan O'Donoghue" <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Viswanath Boma <quic_vboma@...cinc.com>,
        Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Mecid <mecid@...omediagroup.de>,
        Renjiang Han <renjiang.han@....qualcomm.com>
Subject: Re: [PATCH v2] media: venus: vdec: restrict EOS addr quirk to IRIS2 only

On Wed, 26 Nov 2025 at 08:02, Dikshita Agarwal
<dikshita.agarwal@....qualcomm.com> wrote:
>
>
>
> On 11/26/2025 6:43 AM, Dmitry Baryshkov wrote:
> > On Tue, Nov 25, 2025 at 11:04:19AM +0530, Dikshita Agarwal wrote:
> >> On SM8250 (IRIS2) with firmware older than 1.0.087, the firmware could
> >
> > Hmm, interesting. In linux-firmware we have VIDEO.IR.1.0-00005-PROD-4
> > for SM8250 firmware. This version wouldn't be parsed at all for SM8250
> > (nor does it follow the format string). Why? Would you please fix
> > version parsing for this firmware?
>
> Right, Seems this firmware doesn't have the proper version string, I will
> upload a new binary with proper version string soon.

That's fine, but also we need to fix the driver to correctly work with
the firmware we currently have in linux-firmware.

>
> >
> >> not handle a dummy device address for EOS buffers, so a NULL device
> >> address is sent instead. The existing check used IS_V6() alongside a
> >> firmware version gate:
> >>
> >>     if (IS_V6(core) && is_fw_rev_or_older(core, 1, 0, 87))
> >>         fdata.device_addr = 0;
> >>     else
> >>      fdata.device_addr = 0xdeadb000;
> >>
> >> However, SC7280 which is also V6, uses a firmware string of the form
> >> "1.0.<commit-hash>", which the version parser translates to 1.0.0. This
> >
> > I still think that using commit-hash is a mistake. It doesn't allow any
> > version checks.
>
> Agree, we had this discussion with firmware team sometime back and for all
> latest firmware they are having rel version in the firmware binary, but
> SC7280 firmware binary would still have commit hash in version string.

What prevents us from updating SC7280 firmware to also include :rel-NNN part?

>
> Thanks,
> Dikshita
> >
> >> unintentionally satisfies the `is_fw_rev_or_older(..., 1, 0, 87)`
> >> condition on SC7280. Combined with IS_V6() matching there as well, the
> >> quirk is incorrectly applied to SC7280, causing VP9 decode failures.
> >>
> >> Constrain the check to IRIS2 (SM8250) only, which is the only platform
> >> that needed this quirk, by replacing IS_V6() with IS_IRIS2(). This
> >> restores correct behavior on SC7280 (no forced NULL EOS buffer address).
> >>
> >> Fixes: 47f867cb1b63 ("media: venus: fix EOS handling in decoder stop command")
> >> Cc: stable@...r.kernel.org
> >> Reported-by: Mecid <mecid@...omediagroup.de>
> >> Closes: https://github.com/qualcomm-linux/kernel-topics/issues/222
> >> Co-developed-by: Renjiang Han <renjiang.han@....qualcomm.com>
> >> Signed-off-by: Renjiang Han <renjiang.han@....qualcomm.com>
> >> Signed-off-by: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
> >> ---
> >> Changes in v2:
> >> - Fixed email address for Mecid (Konrad)
> >> - Added inline comment for the quirk (Konrad)
> >> - Link to v1: https://lore.kernel.org/r/20251124-venus-vp9-fix-v1-1-2ff36d9f2374@oss.qualcomm.com
> >> ---
> >>  drivers/media/platform/qcom/venus/vdec.c | 8 +++++++-
> >>  1 file changed, 7 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> >> index 4a6641fdffcf79705893be58c7ec5cf485e2fab9..6b3d5e59133e6902353d15c24c8bbaed4fcb6808 100644
> >> --- a/drivers/media/platform/qcom/venus/vdec.c
> >> +++ b/drivers/media/platform/qcom/venus/vdec.c
> >> @@ -565,7 +565,13 @@ vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
> >>
> >>              fdata.buffer_type = HFI_BUFFER_INPUT;
> >>              fdata.flags |= HFI_BUFFERFLAG_EOS;
> >> -            if (IS_V6(inst->core) && is_fw_rev_or_older(inst->core, 1, 0, 87))
> >> +
> >> +            /* Send NULL EOS addr for only IRIS2 (SM8250),for firmware <= 1.0.87.
> >> +             * SC7280 also reports "1.0.<hash>" parsed as 1.0.0; restricting to IRIS2
> >> +             * avoids misapplying this quirk and breaking VP9 decode on SC7280.
> >> +             */
> >> +
> >> +            if (IS_IRIS2(inst->core) && is_fw_rev_or_older(inst->core, 1, 0, 87))
> >>                      fdata.device_addr = 0;
> >>              else
> >>                      fdata.device_addr = 0xdeadb000;
> >>
> >> ---
> >> base-commit: 1f2353f5a1af995efbf7bea44341aa0d03460b28
> >> change-id: 20251121-venus-vp9-fix-1ff602724c02
> >>
> >> Best regards,
> >> --
> >> Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
> >>
> >



-- 
With best wishes
Dmitry