[PATCH 7/9] drm/shmem-helpers: Redirect mmap for imported dma-buf

[Thomas Zimmermann]

Hi

Am 11.05.20 um 11:35 schrieb Daniel Vetter:
> Currently this seems to work by converting the sgt into a pages array,
> and then treating it like a native object. Do the right thing and
> redirect mmap to the exporter.
> 
> With this nothing is calling get_pages anymore on imported dma-buf,
> and we can start to remove the use of the ->pages array for that case.
> 
> v2: Rebase
> 
> Cc: Gerd Hoffmann <kraxel at redhat.com>
> Cc: Rob Herring <robh at kernel.org>
> Cc: Noralf Trønnes <noralf at tronnes.org>
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> ---
>  drivers/gpu/drm/drm_gem_shmem_helper.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index b9cba5cc61c3..117a7841e284 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -551,6 +551,9 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
>  	/* Remove the fake offset */
>  	vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
>  
> +	if (obj->import_attach)
> +		return dma_buf_mmap(obj->dma_buf, vma, 0);
> +

Just a question: how does it work with the fake value in vm_pgoffset?
The offset is a DRM-specific thing and the dma-buf exporter expects the
real offset?

With this question clarified:

Acked-by: Thomas Zimmermann <tzimmermann at suse.de>


>  	shmem = to_drm_gem_shmem_obj(obj);
>  
>  	ret = drm_gem_shmem_get_pages(shmem);
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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