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From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
To: Sakari Ailus <sakari.ailus@iki.fi>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>,
	Hans Verkuil <hverkuil@xs4all.nl>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Pawel Osciak <pawel@osciak.com>,
	Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>,
	Mauro Carvalho Chehab <mchehab@infradead.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH 3/9 v6] V4L: document the new VIDIOC_CREATE_BUFS and VIDIOC_PREPARE_BUF ioctl()s
Date: Thu, 1 Sep 2011 09:10:48 +0200 (CEST)	[thread overview]
Message-ID: <Pine.LNX.4.64.1109010904300.21309@axis700.grange> (raw)
In-Reply-To: <20110831211157.GR12368@valkosipuli.localdomain>

On Thu, 1 Sep 2011, Sakari Ailus wrote:

> Hi Guennadi,
> 
> On Wed, Aug 31, 2011 at 08:02:42PM +0200, Guennadi Liakhovetski wrote:
> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
> > Cc: Hans Verkuil <hverkuil@xs4all.nl>
> > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> > Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
> > Cc: Pawel Osciak <pawel@osciak.com>
> > Cc: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
> > ---
> >  Documentation/DocBook/media/v4l/io.xml             |   17 +++
> >  Documentation/DocBook/media/v4l/v4l2.xml           |    2 +
> >  .../DocBook/media/v4l/vidioc-create-bufs.xml       |  147 ++++++++++++++++++++
> >  .../DocBook/media/v4l/vidioc-prepare-buf.xml       |   96 +++++++++++++
> >  4 files changed, 262 insertions(+), 0 deletions(-)
> >  create mode 100644 Documentation/DocBook/media/v4l/vidioc-create-bufs.xml
> >  create mode 100644 Documentation/DocBook/media/v4l/vidioc-prepare-buf.xml

[snip]

> > +  <refsect1>
> > +    <title>Description</title>
> > +
> > +    <para>Applications can optionally call the
> > +<constant>VIDIOC_PREPARE_BUF</constant> ioctl to pass ownership of the buffer
> > +to the driver before actually enqueuing it, using the
> > +<constant>VIDIOC_QBUF</constant> ioctl, and to prepare it for future I/O.
> > +Such preparations may include cache invalidation or cleaning. Performing them
> 
> I think it could be added that the first time when the buffer is prepared,
> the preparation may include very time consuming tasks such as memory
> allocation and iommu mapping of that memory.

Sure, looking forward to your incremental patch.

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/

  reply	other threads:[~2011-09-01  7:10 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-31 18:02 [PATCH 0/9 v6] new ioctl()s and soc-camera implementation Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 1/9 v6] V4L: add a new videobuf2 buffer state VB2_BUF_STATE_PREPARED Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 2/9 v6] V4L: add two new ioctl()s for multi-size videobuffer management Guennadi Liakhovetski
2011-08-31 21:06   ` Sakari Ailus
2011-09-01  7:03     ` Guennadi Liakhovetski
2011-09-01  8:35       ` Laurent Pinchart
2011-09-01  8:53         ` Guennadi Liakhovetski
2011-09-01  8:42       ` Sakari Ailus
2011-09-01  9:24         ` Guennadi Liakhovetski
2011-09-01 10:19           ` Sakari Ailus
2011-09-01 10:51             ` Guennadi Liakhovetski
2011-09-01 11:06               ` Sakari Ailus
2011-09-01 13:35                 ` Laurent Pinchart
2011-09-01 13:45                   ` Guennadi Liakhovetski
2011-09-08  7:45         ` [PATCH 2/9 v7] " Guennadi Liakhovetski
2011-09-08  7:46           ` [PATCH 3/9 v7] V4L: document the new VIDIOC_CREATE_BUFS and VIDIOC_PREPARE_BUF ioctl()s Guennadi Liakhovetski
2011-09-09 13:24             ` Laurent Pinchart
2011-09-27 10:51             ` Hans Verkuil
2011-09-27 15:49               ` Guennadi Liakhovetski
2011-09-27 19:50                 ` Sakari Ailus
2011-09-28  7:34                 ` Hans Verkuil
2011-09-27 17:01               ` [PATCH 3/9 v8] " Guennadi Liakhovetski
2011-09-28 13:20                 ` [PATCH 3/9 v9] " Guennadi Liakhovetski
2011-09-28 14:58                   ` [PATCH 3/9 v10] " Guennadi Liakhovetski
2011-09-08  7:48           ` [PATCH] V4L: docbook documentation for struct v4l2_create_buffers Guennadi Liakhovetski
2011-09-08  8:10           ` [PATCH 1/1] v4l: Mark VIDIOC_PREPARE_BUFS and VIDIOC_CREATE_BUFS experimental Sakari Ailus
2011-09-27 10:34           ` [PATCH 2/9 v7] V4L: add two new ioctl()s for multi-size videobuffer management Hans Verkuil
2011-09-27 11:00             ` Guennadi Liakhovetski
2011-09-27 11:06               ` Hans Verkuil
2011-09-27 12:19                 ` Guennadi Liakhovetski
2011-09-27 13:40                   ` Hans Verkuil
2011-09-27 16:54                     ` [PATCH 2/9 v8] " Guennadi Liakhovetski
2011-09-28  8:06                       ` Hans Verkuil
2011-09-28  8:34                         ` Guennadi Liakhovetski
2011-09-28  8:48                           ` Guennadi Liakhovetski
2011-09-28  9:01                             ` Hans Verkuil
2011-09-28 13:19                       ` [PATCH 2/9 v9] " Guennadi Liakhovetski
2011-09-28 13:33                         ` Sakari Ailus
2011-09-28 14:59                           ` Guennadi Liakhovetski
2011-09-28 14:56                         ` [PATCH 2/9 v10] " Guennadi Liakhovetski
2011-09-28 20:15                           ` Sakari Ailus
2011-09-28 20:38                             ` Guennadi Liakhovetski
2011-09-29  6:59                               ` Sakari Ailus
2011-09-29  8:12                                 ` Guennadi Liakhovetski
2011-09-27 17:08             ` [PATCH 2/9 v7] " Laurent Pinchart
2011-09-28  8:09               ` Hans Verkuil
2011-08-31 18:02 ` [PATCH 3/9 v6] V4L: document the new VIDIOC_CREATE_BUFS and VIDIOC_PREPARE_BUF ioctl()s Guennadi Liakhovetski
2011-08-31 21:11   ` Sakari Ailus
2011-09-01  7:10     ` Guennadi Liakhovetski [this message]
2011-09-01 11:08       ` [PATCH 1/1] v4l: Add note on buffer locking to memory and DMA mapping to PREPARE_BUF Sakari Ailus
2011-09-28 20:20         ` Sakari Ailus
2011-09-28 20:31           ` Guennadi Liakhovetski
2011-11-03 12:13   ` [PATCH 3/9 v6] V4L: document the new VIDIOC_CREATE_BUFS and VIDIOC_PREPARE_BUF ioctl()s Mauro Carvalho Chehab
2011-08-31 18:02 ` [PATCH 4/9 v6] V4L: vb2: prepare to support multi-size buffers Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 5/9 v6] V4L: vb2: add support for buffers of different sizes on a single queue Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 6/9 v6] V4L: sh-mobile-ceu-camera: prepare to support multi-size buffers Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 7/9 v6] dmaengine: ipu-idmac: add support for the DMA_PAUSE control Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 8/9 v6] V4L: mx3-camera: prepare to support multi-size buffers Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 9/9 v6] V4L: soc-camera: add 2 new ioctl() handlers Guennadi Liakhovetski

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