On 28 February 2011 11:33, Laurent Pinchart < laurent.pinch...@ideasonboard.com> wrote:
> On Monday 28 February 2011 11:21:52 Hans Verkuil wrote: > > On Monday, February 28, 2011 11:11:47 Laurent Pinchart wrote: > > > On Saturday 26 February 2011 13:12:42 Hans Verkuil wrote: > > > > On Friday, February 25, 2011 18:22:51 Linus Walleij wrote: > > > > > 2011/2/24 Edward Hervey <bilb...@gmail.com>: > > > > > > What *needs* to be solved is an API for data allocation/passing > at > > > > > > the kernel level which v4l2,omx,X,GL,vdpau,vaapi,... can use and > > > > > > that userspace (like GStreamer) can pass around, monitor and know > > > > > > about. > > > > > > > > > > I think the patches sent out from ST-Ericsson's Johan Mossberg to > > > > > linux-mm for "HWMEM" (hardware memory) deals exactly with buffer > > > > > passing, pinning of buffers and so on. The CMA (Contigous Memory > > > > > Allocator) has been slightly modified to fit hand-in-glove with > > > > > HWMEM, so CMA provides buffers, HWMEM pass them around. > > > > > > > > > > Johan, when you re-spin the HWMEM patchset, can you include > > > > > linaro-dev and linux-media in the CC? > Yepp..Johan will do that (his mail is fubar at the moment so I will answer instead :-) ) > > > > > > > > Yes, please. This sounds promising and we at linux-media would very > > > > much like to take a look at this. I hope that the CMA + HWMEM > > > > combination is exactly what we need. > > > > > > Once again let me restate what I've been telling for some time: CMA > must > > > be *optional*. Not all hardware need contiguous memory. I'll have a > look > > > at the next HWMEM version. > hwmem API has Scattered memory support as well (not implemented yet though) > > > > Yes, it is optional when you look at specific hardware. On a kernel level > > however it is functionality that is required in order to support all the > > hardware. There is little point in solving one issue and not the other. > > I agree. What I meant is that we need to make sure there's no HWMEM -> CMA > dependency. > > HWMEM has no CMA dependency, although hwmem is easily adapted ontop of CMA(once the speculative prefetch stuff in ARM arch is resolved) BR /Robert F _______________________________________________ > st-ericsson mailing list > st-erics...@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/st-ericsson >
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