linux-kernel - Re: [PATCH] media: verisilicon: Additional fix for the crash when opening the driver

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Message-ID: <CAAEAJfAG_Z_tW8_LzgL7D+tGFYRhyJz3n0uy0gZiOkMnz6FOGA@mail.gmail.com>
Date:   Tue, 23 May 2023 14:36:32 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Michael Tretter <m.tretter@...gutronix.de>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        ezequiel@...guardiasur.com.ar, nicolas.dufresne@...labora.com,
        p.zabel@...gutronix.de, mchehab@...nel.org,
        m.szyprowski@...sung.com, didi.debian@...ow.org,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        hverkuil-cisco@...all.nl, kernel@...gutronix.de,
        regressions@...ts.linux.dev
Subject: Re: [PATCH] media: verisilicon: Additional fix for the crash when
 opening the driver

Hi guys,

After reviewing the format logic (hantro_reset_encoded_fmt and
hantro_reset_raw_fmt).
It seems to me trying to support Decoders, Encoders and so many
different SoC Variants, is getting increasingly fragile.
This driver is becoming a big fat monolith. Regressions like this will
be increasingly frequent.

The only codec that supports encoding right now is JPEG, so I think
it's a good idea to remove it for good,
and split it to its own driver.

Anyone volunteering? :-)

Thanks,
Ezequiel

On Tue, May 23, 2023 at 2:06 PM Michael Tretter
<m.tretter@...gutronix.de> wrote:
>
> On Tue, 23 May 2023 18:36:09 +0200, Benjamin Gaignard wrote:
> >
> > Le 23/05/2023 à 18:25, Benjamin Gaignard a écrit :
> > > This fixes the following issue observed on Odroid-M1 board:
> > >
> > >   Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
> > >   Mem abort info:
> > >   ...
> > >   Modules linked in: crct10dif_ce hantro_vpu snd_soc_simple_card snd_soc_simple_card_utils v4l2_vp9 v4l2_h264 rockchip_saradc v4l2_mem2mem videobuf2_dma_contig videobuf2_memops rtc_rk808 videobuf2_v4l2 industrialio_triggered_buffer rockchip_thermal dwmac_rk stmmac_platform stmmac videodev kfifo_buf display_connector videobuf2_common pcs_xpcs mc rockchipdrm analogix_dp dw_mipi_dsi dw_hdmi drm_display_helper panfrost drm_shmem_helper gpu_sched ip_tables x_tables ipv6
> > >   CPU: 3 PID: 176 Comm: v4l_id Not tainted 6.3.0-rc7-next-20230420 #13481
> > >   Hardware name: Hardkernel ODROID-M1 (DT)
> > >   pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > >   pc : hantro_try_fmt+0xa0/0x278 [hantro_vpu]
> > >   lr : hantro_try_fmt+0x94/0x278 [hantro_vpu]
> > >   ...
> > >   Call trace:
> > >    hantro_try_fmt+0xa0/0x278 [hantro_vpu]
> > >    hantro_set_fmt_out+0x3c/0x298 [hantro_vpu]
> > >    hantro_reset_raw_fmt+0x98/0x128 [hantro_vpu]
> > >    hantro_set_fmt_cap+0x240/0x254 [hantro_vpu]
> > >    hantro_reset_encoded_fmt+0x94/0xcc [hantro_vpu]
> > >    hantro_reset_fmts+0x18/0x38 [hantro_vpu]
> > >    hantro_open+0xd4/0x20c [hantro_vpu]
> > >    v4l2_open+0x80/0x120 [videodev]
> > >    chrdev_open+0xc0/0x22c
> > >    do_dentry_open+0x13c/0x48c
> > >    vfs_open+0x2c/0x38
> > >    path_openat+0x550/0x934
> > >    do_filp_open+0x80/0x12c
> > >    do_sys_openat2+0xb4/0x168
> > >    __arm64_sys_openat+0x64/0xac
> > >    invoke_syscall+0x48/0x114
> > >    el0_svc_common+0x100/0x120
> > >    do_el0_svc+0x3c/0xa8
> > >    el0_svc+0x40/0xa8
> > >    el0t_64_sync_handler+0xb8/0xbc
> > >    el0t_64_sync+0x190/0x194
> > >   Code: 97fc8a7f f940aa80 52864a61 72a686c1 (b9400800)
> > >   ---[ end trace 0000000000000000 ]---
> > >
> > > Fixes: db6f68b51e5c ("media: verisilicon: Do not set context src/dst formats in reset functions")
>
> This patch partially reverts the previous commit. I wonder whether the reason
> for resetting the context format only if the targeted queue is not busy still
> stands.
>
> > >
> > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>
> Tested-by: Michael Tretter <m.tretter@...gutronix.de>
>
> > > ---
> >
> > Diederick, Marek, Michael,
> > I have tested this patch on my boards and I see no regressions on
> > decoder part and no more crash when probing the encoder.
> > Could you test it on your side to confirm it is ok ?
> >
> > Thorsten, I try/test regzbot commands, please tell me if it is correct.
> >
> > #regzbot ^introduced db6f68b51e5c
> > #regzbot title media: verisilicon: null pointer dereference in try_fmt
> > #regzbot ignore-activity
> >
> >
> > >   drivers/media/platform/verisilicon/hantro_v4l2.c | 6 ++++--
> > >   1 file changed, 4 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> > > index 835518534e3b..61cfaaf4e927 100644
> > > --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
> > > +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
> > > @@ -397,10 +397,12 @@ hantro_reset_raw_fmt(struct hantro_ctx *ctx, int bit_depth)
> > >     if (!raw_vpu_fmt)
> > >             return -EINVAL;
> > > -   if (ctx->is_encoder)
> > > +   if (ctx->is_encoder) {
> > >             encoded_fmt = &ctx->dst_fmt;
> > > -   else
> > > +           ctx->vpu_src_fmt = raw_vpu_fmt;
> > > +   } else {
> > >             encoded_fmt = &ctx->src_fmt;
> > > +   }
> > >     hantro_reset_fmt(&raw_fmt, raw_vpu_fmt);
> > >     raw_fmt.width = encoded_fmt->width;
> >