On Tue, Jul 14, 2020 at 08:13:03PM +0100, Chris Wilson wrote:
> Quoting Ville Syrjala (2020-07-14 19:51:28)
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >
> > Since g4x the CFB base only takes a 28bit offset into stolen.
> > Not sure if the CFB is allowed to start below that limit but
> > then extend beyond it. Let's assume not and just restrict the
> > allocation to the first 256MiB (in the unlikely case
> > we have more stolen than that).
> >
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/display/intel_fbc.c | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> > index 85723fba6002..448e966bad11 100644
> > --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> > +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> > @@ -424,6 +424,14 @@ static void intel_fbc_deactivate(struct drm_i915_private *dev_priv,
> > fbc->no_fbc_reason = reason;
> > }
> >
> > +static u64 intel_fbc_cfb_base_max(struct drm_i915_private *i915)
> > +{
> > + if (INTEL_GEN(i915) >= 5 || IS_G4X(i915))
> > + return BIT(28);
> > + else
> > + return BIT(32);
>
> BIT_ULL(32)
Argh. I should stop being lazy and always test build 32bit
locally. Also, 'long' really is the most annoying type ever.
--
Ville Syrjälä
Intel
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