[PATCH] drm/etnaviv: switch to PFN mappings

[Lucas Stach]

Am Freitag, dem 09.09.2022 um 11:20 +0200 schrieb Lucas Stach:
> There is no reason to use page based mappings, as the established
> mappings are special driver mappings anyways and should not be
> handled like normal pages.
> 
> Be consistent with what other drivers do and use raw PFN based
> mappings.

Anyone up for reviewing this? Basically it moves etnaviv closer to what
all the other DRM drivers are doing.

Regards,
Lucas

> 
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> ---
>  drivers/gpu/drm/etnaviv/etnaviv_gem.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> index d45bf0368339..68e4446a94ad 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> @@ -130,7 +130,7 @@ static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
>  {
>  	pgprot_t vm_page_prot;
>  
> -	vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
> +	vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
>  
>  	vm_page_prot = vm_get_page_prot(vma->vm_flags);
>  
> @@ -165,7 +165,8 @@ static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
>  	struct vm_area_struct *vma = vmf->vma;
>  	struct drm_gem_object *obj = vma->vm_private_data;
>  	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
> -	struct page **pages, *page;
> +	struct page **pages;
> +	unsigned long pfn;
>  	pgoff_t pgoff;
>  	int err;
>  
> @@ -189,12 +190,12 @@ static vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf)
>  	/* We don't use vmf->pgoff since that has the fake offset: */
>  	pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
>  
> -	page = pages[pgoff];
> +	pfn = page_to_pfn(pages[pgoff]);
>  
>  	VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
> -	     page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
> +	     pfn, pfn << PAGE_SHIFT);
>  
> -	return vmf_insert_page(vma, vmf->address, page);
> +	return vmf_insert_pfn(vma, vmf->address, pfn);
>  }
>  
>  int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)