On Wed, Nov 16, 2022 at 10:17:02AM +0100, Lucas Stach wrote:
> 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.
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Note that since you've had VM_IO before it was already VM_SPECIAL, so
outside of etnaviv (for stuff like get_user_pages/userptr) there's not
really a difference. But it's nice to be a tad more consistent, since page
mapping + VM_IO really doesn't make that much sense :-)
-Daniel
>
> Regards,
> Lucas
>
> >
> > Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> > ---
> > 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)
>
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
