On Wed, Apr 11, 2012 at 03:23:26PM +0200, Thierry Reding wrote: > * Daniel Vetter wrote: > > On Wed, Apr 11, 2012 at 02:10:30PM +0200, Thierry Reding wrote: > > > This commit adds a very basic DRM driver for NVIDIA Tegra SoCs. It > > > currently has rudimentary GEM support and can run a console on the > > > framebuffer as well as X using the xf86-video-modesetting driver. > > > Only the RGB output is supported. Quite a lot of things still need > > > to be worked out and there is a lot of room for cleanup. > > > > Indeed, after a quick look there are tons of functions that are just stubs > > ;-) One thing I wonder though is why you directly use the iommu api and > > not wrap it up into dma_map? Is arm infrastructure just not there yet or > > do you plan to tightly integrate the tegra drm with the iommu (e.g. for > > process space switching or similarly funky stuff)? > > I'm not sure I know what you are referring to. Looking for all users of > iommu_map() doesn't turn up anything related to dma_map. Can you point me in > the right direction?
Well, you use the iommu api to map/unmap memory into the iommu for tegra, whereas usually device drivers just use the dma api to do that. The usual interface is dma_map_sg/dma_unmap_sg, but there are quite a few variants around. I'm just wondering why this you've choosen this. -Daniel -- Daniel Vetter Mail: dan...@ffwll.ch Mobile: +41 (0)79 365 57 48 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
