linux-kernel - Re: [PATCH 01/18] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT flag

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Date:   Fri, 25 Sep 2020 18:47:12 +0000
From:   Tomasz Figa <tfiga@...omium.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Matt Porter <mporter@...nel.crashing.org>,
        iommu@...ts.linux-foundation.org,
        Stefan Richter <stefanr@...6.in-berlin.de>,
        linux1394-devel@...ts.sourceforge.net, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        nouveau@...ts.freedesktop.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-mm@...ck.org,
        alsa-devel@...a-project.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH 01/18] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT
 flag

Hi Christoph,

On Tue, Sep 15, 2020 at 05:51:05PM +0200, Christoph Hellwig wrote:
> From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> 
> The patch partially reverts some of the UAPI bits of the buffer
> cache management hints. Namely, the queue consistency (memory
> coherency) user-space hint because, as it turned out, the kernel
> implementation of this feature was misusing DMA_ATTR_NON_CONSISTENT.
> 
> The patch revers both kernel and user space parts: removes the
> DMA consistency attr functions, rollbacks changes to v4l2_requestbuffers,
> v4l2_create_buffers structures and corresponding UAPI functions
> (plus compat32 layer) and cleanups the documentation.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  .../userspace-api/media/v4l/buffer.rst        | 17 -------
>  .../media/v4l/vidioc-create-bufs.rst          |  6 +--
>  .../media/v4l/vidioc-reqbufs.rst              | 12 +----
>  .../media/common/videobuf2/videobuf2-core.c   | 46 +++----------------
>  .../common/videobuf2/videobuf2-dma-contig.c   | 19 --------
>  .../media/common/videobuf2/videobuf2-dma-sg.c |  3 +-
>  .../media/common/videobuf2/videobuf2-v4l2.c   | 18 +-------
>  drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 10 +---
>  drivers/media/v4l2-core/v4l2-ioctl.c          |  5 +-
>  include/media/videobuf2-core.h                |  7 +--
>  include/uapi/linux/videodev2.h                | 13 +-----
>  11 files changed, 22 insertions(+), 134 deletions(-)

Acked-by: Tomasz Figa <tfiga@...omium.org>

Best regards,
Tomasz