Messages in this thread | | | Date | Wed, 12 Oct 2011 15:01:37 +0100 | Subject | Re: [Linaro-mm-sig] [RFC 1/2] dma-buf: Introduce dma buffer sharing mechanism | From | Dave Airlie <> |
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> But then we'd need a different set of accessors for every different > drm/v4l/etc driver, wouldn't we?
Not any more different than you need for this, you just have a new interface that you request a sw object from, then mmap that object, and underneath it knows who owns it in the kernel.
mmap just feels wrong in this API, which is a buffer sharing API not a buffer mapping API.
> I guess if sharing a buffer between multiple drm devices, there is > nothing stopping you from having some NOT_DMABUF_MMAPABLE flag you > pass when the buffer is allocated, then you don't have to support > dmabuf->mmap(), and instead mmap via device and use some sort of > DRM_CPU_PREP/FINI ioctls for synchronization..
Or we could make a generic CPU accessor that we don't have to worry about.
Dave.
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