On Mon, Jun 11, 2012 at 05:07:03PM +0200, Daniel Vetter wrote: > Especially vesafb likes to map everything as uc- (yikes), and if that > mapping hangs around still while we try to map the gtt as wc the > kernel will downgrade our request to uc-, resulting in abyssal > performance. > > Unfortunately we can't do this as early as readon does (i.e. as the > first thing we do when initializing the hw) because our fb/mmio space > region moves around on a per-gen basis. So I've had to move it below > the gtt initialization, but that seems to work, too. The important > thing is that we do this before we set up the gtt wc mapping. > > Now an altogether different question is why people compile their > kernels with vesafb enabled, but I guess making things just work isn't > bad per se ... > > Reported-and-tested-by: "Kilarski, Bernard R" <[email protected]> > Signed-Off-by: Daniel Vetter <[email protected]> > --- > drivers/gpu/drm/i915/i915_dma.c | 35 ++++++++++++++++++++++++++++------- > 1 file changed, 28 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c > index 262a74d..6be01c8 100644 > --- a/drivers/gpu/drm/i915/i915_dma.c > +++ b/drivers/gpu/drm/i915/i915_dma.c > @@ -1401,6 +1401,25 @@ i915_mtrr_setup(struct drm_i915_private *dev_priv, > unsigned long base, > } > } > > +static void i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv) > +{ > + struct apertures_struct *ap; > + struct pci_dev *pdev = dev_priv->dev->pdev; > + bool primary = false; > + > + ap = alloc_apertures(1); > + ap->ranges[0].base = dev_priv->dev->agp->base; > + ap->ranges[0].size = > + dev_priv->mm.gtt->gtt_mappable_entries << PAGE_SHIFT; > + > +#ifdef CONFIG_X86 > + primary = pdev->resource[PCI_ROM_RESOURCE].flags & > IORESOURCE_ROM_SHADOW; > +#endif > + > + remove_conflicting_framebuffers(ap, "radeondrmfb", primary); ^^^^^^^^^^^
Nice disguise :) > + kfree(ap); > +} > + > /** > * i915_driver_load - setup chip and create an initial config > * @dev: DRM device -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
