Re: [PATCH 59/74] drm/nv17-50: restore fence buffer on resume

[Herton Ronaldo Krzesinski]

On Thu, Jan 24, 2013 at 06:36:52PM +0100, Marcin Slusarz wrote:
> On Thu, Jan 24, 2013 at 01:27:11AM -0200, Herton Ronaldo Krzesinski wrote:
> > 3.5.7.4 -stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Marcin Slusarz <marcin.slusarz@xxxxxxxxx>
> > 
> > commit f20ebd034eab43fd38c58b11c5bb5fb125e5f7d7 upstream.
> > 
> > Since commit 5e120f6e4b3f35b741c5445dfc755f50128c3c44 "drm/nouveau/fence:
> > convert to exec engine, and improve channel sync" nouveau fence sync
> > implementation for nv17-50 and nvc0+ started to rely on state of fence buffer
> > left by previous sync operation. But as pinned bo's (where fence state is
> > stored) are not saved+restored across suspend/resume, we need to do it
> > manually.
> > 
> > nvc0+ was fixed by commit d6ba6d215a538a58f0f0026f0961b0b9125e8042
> > "drm/nvc0/fence: restore pre-suspend fence buffer context on resume".
> > 
> > Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=50121
> > 
> > Signed-off-by: Marcin Slusarz <marcin.slusarz@xxxxxxxxx>
> > Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
> > [ herton: backport for 3.5, looks like we only need to call
> >   nouveau_bo_wr32 on nv10_fence_init ]
> > Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
> > ---
> >  drivers/gpu/drm/nouveau/nv10_fence.c |    3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/nouveau/nv10_fence.c b/drivers/gpu/drm/nouveau/nv10_fence.c
> > index 8a1b750..18932a6 100644
> > --- a/drivers/gpu/drm/nouveau/nv10_fence.c
> > +++ b/drivers/gpu/drm/nouveau/nv10_fence.c
> > @@ -155,6 +155,9 @@ nv10_fence_fini(struct drm_device *dev, int engine, bool suspend)
> >  static int
> >  nv10_fence_init(struct drm_device *dev, int engine)
> >  {
> > +	struct nv10_fence_priv *priv = nv_engine(dev, engine);
> > +
> > +	nouveau_bo_wr32(priv->bo, 0, priv->sequence);
> >  	return 0;
> >  }
> >  
> > -- 
> 
> As I already mentioned in linked bug report, this backport will crash on module
> load for nv10-nv17 cards. priv->bo is created only for chipsets >= nv17.
> 
> You need to add "if (priv->bo)" before nouveau_bo_wr32.

Indeed, thanks. I didn't noticed it on nv10_fence_create. This is the
fixed patch: