On Sun, Mar 2, 2014 at 8:09 PM, Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> wrote: > The GEM CMA helpers uses a custom mmap implementation based on > remap_pfn_range(). While this works when the buffer DMA and physical > addresses are identical, it fails to take IOMMU into account and tries > to mmap the buffer to userspace using the DMA virtual address instead of > the physical address. This results in mapping random physical pages when > the device is behind an IOMMU. > > Use the DMA mapping dma_mmap_writecombine() function instead. > > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> Tested-by: Philipp Zabel <philipp.zabel@xxxxxxxxx> regards Philipp _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
