[agp-mm][PATCH 2/4][AGP] Add generic support for graphics dma remapping

[agp-mm] [AGP] Add generic support for graphics dma remapping New driver hooks for support graphics memory dma remapping are introduced in this patch. It makes generic code can tell if current device needs dma remapping, then call driver provided interfaces for mapping and unmapping. Change has

[agp-mm][PATCH 2/4][AGP] Add generic support for graphics dma remapping

[agp-mm] [AGP] Add generic support for graphics dma remapping New driver hooks for support graphics memory dma remapping are introduced in this patch. It makes generic code can tell if current device needs dma remapping, then call driver provided interfaces for mapping and unmapping. Change has