Re: [PATCH v2 3/5] drm: Add and export function drm_gem_cma_mmap_noncoherent

Christoph Hellwig
2021-03-12T16:38:24Z

On Thu, Mar 11, 2021 at 04:12:55PM +0000, Paul Cercueil wrote:
> ret = dma_mmap_pages(cma_obj->base.dev->dev,
> vma, vma->vm_end - vma->vm_start,
> virt_to_page(cma_obj->vaddr));
>
> It works fine.
>
> I think I can use remap_pfn_range() for now, and switch to your new API once
> it's available in drm-misc-next.

No, drivers must not use dma_to_phys, and they also must not include
dma-direct.h.