From: Rob Clark <robdclark@gmail.com>
To: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Tomasz Stanislawski <t.stanislaws@samsung.com>,
linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
airlied@redhat.com, m.szyprowski@samsung.com,
kyungmin.park@samsung.com, sumit.semwal@ti.com,
daeinki@gmail.com, daniel.vetter@ffwll.ch, pawel@osciak.com,
linaro-mm-sig@lists.linaro.org, remi@remlab.net,
subashrp@gmail.com, mchehab@redhat.com, g.liakhovetski@gmx.de
Subject: Re: [PATCHv2 3/9] v4l: add buffer exporting via dmabuf
Date: Tue, 31 Jul 2012 07:46:44 -0500 [thread overview]
Message-ID: <CAF6AEGurTWo2AtG=+QkHA2ARVV6OwL7maDpdCyOLEs3QyFKhCA@mail.gmail.com> (raw)
In-Reply-To: <201207311411.06974.hverkuil@xs4all.nl>
On Tue, Jul 31, 2012 at 7:11 AM, Hans Verkuil <hverkuil@xs4all.nl> wrote:
>> > For that matter, wouldn't it be useful to support exporting a userptr buffer
>> > at some point in the future?
>>
>> Shouldn't USERPTR usage be discouraged once we get dma-buf support ?
>
> Why? It's perfectly fine to use it and it's not going away.
>
> I'm not saying that we should support exporting a userptr buffer as a dmabuf fd,
> but I'm just wondering if that is possible at all and how difficult it would be.
it seems not terribly safe, since you don't really have much control
over where the memory comes from w/ userptr. I'm more in favor of
discouraging usage of userptr
BR,
-R
next prev parent reply other threads:[~2012-07-31 12:46 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-14 14:32 [PATCHv2 0/9] Support for dmabuf exporting for videobuf2 Tomasz Stanislawski
2012-06-14 14:32 ` Tomasz Stanislawski
2012-06-14 14:32 ` [PATCHv2 1/9] v4l: vb2-dma-contig: let mmap method to use dma_mmap_coherent call Tomasz Stanislawski
2012-06-14 14:32 ` [PATCHv2 2/9] Documentation: media: description of DMABUF exporting in V4L2 Tomasz Stanislawski
2012-06-14 14:32 ` [PATCHv2 3/9] v4l: add buffer exporting via dmabuf Tomasz Stanislawski
2012-07-31 6:33 ` Hans Verkuil
2012-07-31 11:56 ` Laurent Pinchart
2012-07-31 12:11 ` Hans Verkuil
2012-07-31 12:46 ` Rob Clark [this message]
2012-08-01 8:01 ` Tomasz Stanislawski
2012-08-01 8:10 ` Laurent Pinchart
2012-08-01 8:28 ` Hans Verkuil
2012-08-01 9:35 ` Tomasz Stanislawski
2012-07-31 13:39 ` Rémi Denis-Courmont
2012-07-31 14:03 ` Rob Clark
2012-07-31 14:18 ` Rémi Denis-Courmont
2012-07-31 16:28 ` Laurent Pinchart
2012-07-31 18:39 ` Rémi Denis-Courmont
2012-07-31 21:52 ` Laurent Pinchart
2012-08-01 8:37 ` Rémi Denis-Courmont
2012-08-01 8:37 ` Rémi Denis-Courmont
2012-08-01 11:35 ` Laurent Pinchart
2012-08-01 20:49 ` Rémi Denis-Courmont
2012-08-02 6:35 ` Hans Verkuil
2012-08-02 6:56 ` Rémi Denis-Courmont
2012-08-02 7:08 ` Hans Verkuil
2012-08-02 21:50 ` Laurent Pinchart
2012-08-02 21:41 ` Laurent Pinchart
2012-08-08 9:35 ` Sakari Ailus
2012-08-08 9:46 ` Hans Verkuil
2012-06-14 14:32 ` [PATCHv2 4/9] v4l: vb2: " Tomasz Stanislawski
2012-06-14 14:32 ` [PATCHv2 5/9] v4l: vb2-dma-contig: add support for DMABUF exporting Tomasz Stanislawski
2012-06-14 14:32 ` [PATCHv2 6/9] v4l: s5p-fimc: support for dmabuf exporting Tomasz Stanislawski
2012-06-14 14:32 ` [PATCHv2 7/9] v4l: s5p-tv: mixer: " Tomasz Stanislawski
2012-06-14 14:32 ` [PATCHv2 8/9] v4l: s5p-mfc: " Tomasz Stanislawski
2012-06-14 14:32 ` [PATCHv2 9/9] v4l: vb2-dma-contig: use dma_get_sgtable Tomasz Stanislawski
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