linux-kernel - Re: [PATCH v2 3/5] drm: Add and export function drm_gem_cma_mmap

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Date:   Fri, 12 Mar 2021 16:36:26 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>, od@...c.me,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH v2 3/5] drm: Add and export function
 drm_gem_cma_mmap_noncoherent

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.