On Wed, Jun 26, 2019 at 04:40:13PM +0200, Sam Ravnborg wrote:
> Hi Gerd.
>
> On Wed, Jun 26, 2019 at 08:55:50AM +0200, Gerd Hoffmann wrote:
> > Store width and height of the bo. Needed in case userspace
> > sets up a framebuffer with fb->width != bo->width..
> >
> > Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> > ---
> > include/drm/drm_gem_vram_helper.h | 1 +
> > drivers/gpu/drm/drm_gem_vram_helper.c | 2 ++
> > 2 files changed, 3 insertions(+)
> >
> > diff --git a/include/drm/drm_gem_vram_helper.h b/include/drm/drm_gem_vram_helper.h
> > index 1a0ea18e7a74..3692dba167df 100644
> > --- a/include/drm/drm_gem_vram_helper.h
> > +++ b/include/drm/drm_gem_vram_helper.h
> > @@ -39,6 +39,7 @@ struct drm_gem_vram_object {
> > struct drm_gem_object gem;
> > struct ttm_buffer_object bo;
> > struct ttm_bo_kmap_obj kmap;
> > + unsigned int width, height;
> >
> > /* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */
> > struct ttm_placement placement;
> > diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
> > index 4de782ca26b2..c02bf7694117 100644
> > --- a/drivers/gpu/drm/drm_gem_vram_helper.c
> > +++ b/drivers/gpu/drm/drm_gem_vram_helper.c
> > @@ -377,6 +377,8 @@ int drm_gem_vram_fill_create_dumb(struct drm_file *file,
> > gbo = drm_gem_vram_create(dev, bdev, size, pg_align, interruptible);
> > if (IS_ERR(gbo))
> > return PTR_ERR(gbo);
> > + gbo->width = args->width;
> > + gbo->height = args->height;
> >
> > ret = drm_gem_handle_create(file, &gbo->gem, &handle);
> > if (ret)
>
> Be warned, I may have missed something in the bigger picture.
>
> Your patch will set width and height only for dumb bo's
> But we have several users of drm_gem_vram_create() that will
> not set the width and height.
>
> So only in some cases can we rely on them being set.
> Should this be refactored so we always set width, height.
> Or maybe say in a small comment that width,height are only
> set for dumb bo's?
Also for dumb bo allocated buffers if userspace gets the dimensions wrong
between dumb_create and the addfb, something is wrong. Papering over that
by remembering the right dimensions doesn't look like a good solution.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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