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Date: Wed, 15 Jun 2022 23:16:08 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Nicolas Dufresne <nicolas@...fresne.ca>
Cc: Moudy Ho <moudy.ho@...iatek.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Jernej Skrabec <jernej.skrabec@...l.net>,
Maoguang Meng <maoguang.meng@...iatek.com>,
Hsin-Yi Wang <hsinyi@...gle.com>,
daoyuan huang <daoyuan.huang@...iatek.com>,
Ping-Hsun Wu <ping-hsun.wu@...iatek.com>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Rob Landley <rob@...dley.net>, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
tfiga@...omium.org, drinkcat@...omium.org, acourbot@...omium.org,
pihsun@...omium.org, menghui.lin@...iatek.com,
sj.huang@...iatek.com, ben.lok@...iatek.com, randy.wu@...iatek.com,
srv_heupstream@...iatek.com, Rex-BC Chen <Rex-BC.Chen@...iatek.com>
Subject: Re: [V1] media: mtk-mdp3: Add Mediatek MDP3 Driver
On Wed, Jun 15, 2022 at 03:55:14PM -0400, Nicolas Dufresne wrote:
> Le mercredi 23 juin 2021 à 17:14 +0800, Moudy Ho a écrit :
> > From: mtk18742 <moudy.ho@...iatek.com>
> >
> > Add MDP3 driver for MT8183
> >
> > Signed-off-by: Moudy Ho <moudy.ho@...iatek.com>
> > ---
> > drivers/media/platform/Kconfig | 17 +
> > drivers/media/platform/Makefile | 2 +
> > drivers/media/platform/mtk-mdp3/Makefile | 9 +
> > drivers/media/platform/mtk-mdp3/isp_reg.h | 37 +
> > .../media/platform/mtk-mdp3/mdp-platform.h | 58 +
> > .../media/platform/mtk-mdp3/mdp_reg_ccorr.h | 75 +
> > .../media/platform/mtk-mdp3/mdp_reg_rdma.h | 206 +++
> > drivers/media/platform/mtk-mdp3/mdp_reg_rsz.h | 109 ++
> > .../media/platform/mtk-mdp3/mdp_reg_wdma.h | 125 ++
> > .../media/platform/mtk-mdp3/mdp_reg_wrot.h | 115 ++
> > .../media/platform/mtk-mdp3/mmsys_config.h | 188 +++
> > drivers/media/platform/mtk-mdp3/mmsys_mutex.h | 35 +
> > .../media/platform/mtk-mdp3/mmsys_reg_base.h | 38 +
> > drivers/media/platform/mtk-mdp3/mtk-img-ipi.h | 282 ++++
> > .../media/platform/mtk-mdp3/mtk-mdp3-cmdq.c | 538 ++++++
> > .../media/platform/mtk-mdp3/mtk-mdp3-cmdq.h | 53 +
> > .../media/platform/mtk-mdp3/mtk-mdp3-comp.c | 1437 +++++++++++++++++
> > .../media/platform/mtk-mdp3/mtk-mdp3-comp.h | 157 ++
> > .../media/platform/mtk-mdp3/mtk-mdp3-core.c | 266 +++
> > .../media/platform/mtk-mdp3/mtk-mdp3-core.h | 86 +
> > .../media/platform/mtk-mdp3/mtk-mdp3-debug.c | 973 +++++++++++
> > .../media/platform/mtk-mdp3/mtk-mdp3-debug.h | 39 +
> > .../media/platform/mtk-mdp3/mtk-mdp3-m2m.c | 803 +++++++++
> > .../media/platform/mtk-mdp3/mtk-mdp3-m2m.h | 42 +
> > .../media/platform/mtk-mdp3/mtk-mdp3-regs.c | 748 +++++++++
> > .../media/platform/mtk-mdp3/mtk-mdp3-regs.h | 373 +++++
> > .../media/platform/mtk-mdp3/mtk-mdp3-vpu.c | 313 ++++
> > .../media/platform/mtk-mdp3/mtk-mdp3-vpu.h | 79 +
> > 28 files changed, 7203 insertions(+)
> > create mode 100644 drivers/media/platform/mtk-mdp3/Makefile
> > create mode 100644 drivers/media/platform/mtk-mdp3/isp_reg.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mdp-platform.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mdp_reg_ccorr.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mdp_reg_rdma.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mdp_reg_rsz.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mdp_reg_wdma.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mdp_reg_wrot.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mmsys_config.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mmsys_mutex.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mmsys_reg_base.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-img-ipi.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-cmdq.c
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-cmdq.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-comp.c
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-comp.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-core.c
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-core.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-debug.c
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-debug.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-m2m.c
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-m2m.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-regs.c
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-regs.h
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-vpu.c
> > create mode 100644 drivers/media/platform/mtk-mdp3/mtk-mdp3-vpu.h
[snip]
> > diff --git a/drivers/media/platform/mtk-mdp3/mtk-mdp3-regs.c b/drivers/media/platform/mtk-mdp3/mtk-mdp3-regs.c
> > new file mode 100644
> > index 000000000000..0c4c942b5f9c
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-mdp3/mtk-mdp3-regs.c
> > @@ -0,0 +1,748 @@
[snip]
> > +static void mdp_prepare_buffer(struct img_image_buffer *b,
> > + struct mdp_frame *frame, struct vb2_buffer *vb)
> > +{
> > + struct v4l2_pix_format_mplane *pix_mp = &frame->format.fmt.pix_mp;
> > + unsigned int i;
> > +
> > + b->format.colorformat = frame->mdp_fmt->mdp_color;
> > + b->format.ycbcr_prof = frame->ycbcr_prof;
> > + for (i = 0; i < pix_mp->num_planes; ++i) {
> > + u32 stride = mdp_fmt_get_stride(frame->mdp_fmt,
> > + pix_mp->plane_fmt[i].bytesperline, i);
> > +
> > + b->format.plane_fmt[i].stride = stride;
> > + /*
> > + * TODO(crbug.com/901264): The way to pass an offset within a
> > + * DMA-buf is not defined in V4L2 specification, so we abuse
> > + * data_offset for now. Fix it when we have the right interface,
> > + * including any necessary validation and potential alignment
> > + * issues.
> > + */
> > + b->format.plane_fmt[i].size =
> > + mdp_fmt_get_plane_size(frame->mdp_fmt, stride,
> > + pix_mp->height, i) -
> > + vb->planes[i].data_offset;
> > + b->iova[i] = vb2_dma_contig_plane_dma_addr(vb, i) +
> > + vb->planes[i].data_offset;
>
> As the comment says, data_offset is not valdiated at all for capture devices and
> is only validated so that (length - data_offset > 0) for OUTPUT devices. So this
> is going out of spec and leave the door open for buffer overflow triggered by
> users.
And as documented by the TODO comment, it's clearly an API abuse. This
can't go in as-is, we need to revive the v4l2_buffer extended API that
Boris used to work on.
> > + }
> > + for (; i < MDP_COLOR_GET_PLANE_COUNT(b->format.colorformat); ++i) {
> > + u32 stride = mdp_fmt_get_stride_contig(frame->mdp_fmt,
> > + b->format.plane_fmt[0].stride, i);
> > +
> > + b->format.plane_fmt[i].stride = stride;
> > + b->format.plane_fmt[i].size =
> > + mdp_fmt_get_plane_size(frame->mdp_fmt, stride,
> > + pix_mp->height, i);
> > + b->iova[i] = b->iova[i - 1] + b->format.plane_fmt[i - 1].size;
> > + }
> > + b->usage = frame->usage;
> > +}
--
Regards,
Laurent Pinchart
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