Em 17-08-2012 18:01, Sylwester Nawrocki escreveu: > Hi Laurent, > > On 08/15/2012 11:09 PM, Laurent Pinchart wrote: >> On Wednesday 15 August 2012 18:13:19 Sylwester Nawrocki wrote: >>> On 08/15/2012 12:06 AM, Laurent Pinchart wrote: >>>> On Tuesday 14 August 2012 18:37:23 Sylwester Nawrocki wrote: >>>>> On 08/14/2012 03:04 PM, Mauro Carvalho Chehab wrote: >>>>>> This one requires more testing: >>>>>> >>>>>> May,15 2012: [GIT,PULL,FOR,3.5] DMABUF importer feature in V4L2 API >>>>>> http://patchwork.linuxtv.org/patch/11268 Sylwester Nawrocki >>>>>> <s.nawrocki@xxxxxxxxxxx> >>>>> >>>>> Hmm, this is not valid any more. Tomasz just posted a new patch series >>>>> that adds DMABUF importer and exporter feature altogether. >>>>> >>>>> [PATCHv8 00/26] Integration of videobuf2 with DMABUF >>>>> >>>>> I guess we need someone else to submit test patches for other H/W than >>>>> just Samsung SoCs. I'm not sure if we've got enough resources to port >>>>> this to other hardware. We have been using these features internally for >>>>> some time already. It's been 2 kernel releases and I can see only Ack >>>>> tags from Laurent on Tomasz's patch series, hence it seems there is no >>>>> wide interest in DMABUF support in V4L2 and this patch series is probably >>>>> going to stay in a fridge for another few kernel releases. >>>> >>>> What would be required to push it to v3.7 ? >>> >>> Mauro requested more test coverage on that, which is understood since this >>> is a fairly important API enhancement and the V4L2 video overlay API >>> replacement. >>> >>> We need DMABUF support added at some webcam driver and a DRM driver with >>> prime support (or some V4L2 output driver), I guess it would be best to >>> have that in a PC environment. It looks like i915/radeon/nouveau drivers >>> already have prime support. >> >> uvcvideo has recently been moved to videobuf2, using vb2_vmalloc. I can easily >> test that, except that I have no idea how to export buffers on the i915 side >> when X is running. Have you looked into that ? > > All right. Yes, I'm also not sure yet how to do it. I tried it on a laptop > with i915 driver, but in the running system drmModeGetResources() just fails > with EPERM. I've CCed dri-devel, so hopefully someone can shed some light > on this. Likely, you need to run with root permission to use it, or to write an Xorg driver. It is probably easier to get the V4L driver there, that uses the VIDIOC_OVERLAY stuff, and make it work via DMABUF: http://cgit.freedesktop.org/xorg/driver/xf86-video-v4l/ In order to test it, xawtv has already the code needed to talk with the v4l plugin. What the plugin does is to export the video board as a XV extension, accessible via xawtv. It currently talks with the display card also via XV, but I believe it won't be hard to port it to work with DMABUF. As the interface between xawtv and the v4l plugin is just Xv, changing the code there from VIDIOC_OVERLAY to DMABUF should be trivial. Regards, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
