On Wed, May 30, 2018 at 11:08:57PM +0300, Ville Syrjälä wrote:
> On Fri, May 25, 2018 at 09:50:34PM +0300, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >
> > Instead of plane->fb (which we're going to deprecate for atomic drivers)
> > we need to look at plane->state->fb. The maze of code leading to
> > vmw_kms_helper_dirty() wasn't particularly clear, but my analysis
> > concluded that the calls originating from vmw_*_primary_plane_atomic_update()
> > all pass in the crtc which means we'll never end up in this branch
> > of the function. All other callers use drm_modeset_lock_all() somewhere
> > higher up, which means accessing plane->state is safe. We'll toss in
> > a lockdep assert to catch wrongdoers.
> >
> > v2: Drop the comment and make the code do what it did before (Thomas)
> >
> > Cc: Deepak Rawat <drawat@xxxxxxxxxx>
> > Cc: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
> > Cc: Sinclair Yeh <syeh@xxxxxxxxxx>
> > Cc: VMware Graphics <linux-graphics-maintainer@xxxxxxxxxx>
> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 9 ++++++---
> > 1 file changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> > index 2e4c38bb846d..5417eb1b486e 100644
> > --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> > +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> > @@ -2326,9 +2326,12 @@ int vmw_kms_helper_dirty(struct vmw_private *dev_priv,
> > } else {
> > list_for_each_entry(crtc, &dev_priv->dev->mode_config.crtc_list,
> > head) {
> > - if (crtc->primary->fb != &framebuffer->base)
> > - continue;
> > - units[num_units++] = vmw_crtc_to_du(crtc);
> > + struct drm_plane *plane = crtc->primary;
> > +
> > + lockdep_assert_held(&plane->mutex);
>
> kbuild test robot told me
> >> include/linux/lockdep.h:347:52: error: 'struct drm_modeset_lock' has
> >> no member named 'dep_map'
> #define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map)
>
> Maybe I'll just drop the asserts? Or do people really want them
> (in which case I gues I need to dig out the underlying mutex)?
Eitherway is fine with me.
>
> > +
> > + if (plane->state->fb == &framebuffer->base)
> > + units[num_units++] = vmw_crtc_to_du(crtc);
> > }
> > }
> >
> > --
> > 2.16.1
>
> --
> Ville Syrjälä
> Intel
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