linux-kernel - Re: "Can not ioremap virtual address" (was Re: [git pull] drm)

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Message-Id: <200902131104.04318.jbarnes@virtuousgeek.org>
Date:	Fri, 13 Feb 2009 11:04:03 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Diego Calleja <diegocg@...il.com>
Cc:	Dave Airlie <airlied@...ux.ie>, torvalds@...ux-foundation.org,
	dri-devel@...ts.sf.net, linux-kernel@...r.kernel.org,
	Eric Anholt <eric@...olt.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Nico Schottelius <nico-linux-20090213@...ottelius.org>
Subject: Re: "Can not ioremap virtual address" (was Re: [git pull] drm)

On Friday, February 13, 2009 9:28 am Diego Calleja wrote:
> On Lunes 09 Febrero 2009 09:30:57 Dave Airlie escribió:
> > Hi Linus,
> >
> > Please pull the 'drm-fixes' branch from
> > ssh://master.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6.git
> > drm-fixes
>
> A commit from this merge is causing an error in my machine:
>
> commit ab657db12d7020629f26f30d287558a8d0e32b41
> Author: Eric Anholt <eric@...olt.net>
> Date:   Fri Jan 23 12:57:47 2009 -0800
>
>     drm/i915: Set up an MTRR covering the GTT at driver load.
>
>
> (found using bisection)
>
> The error:
> [   20.270956] [drm] Initialized i915 1.6.0 20080730 on minor 0
> [   20.289492] [drm:i915_initialize] *ERROR* can not ioremap virtual
> address for ring buffer
>
> And in Xorg.0.log: (II) intel(0): direct rendering: Failed
>
>
> But...excluding that printk, everything works OK, including "direct
> rendering: Yes"...
>
> There's a related thread here: http://lkml.org/lkml/2009/2/13/139

Does this prevent the message?  We map it WC in GEM but not in 
i915_initialize...

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 81f1cff..2d797ff 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -202,7 +202,7 @@ static int i915_initialize(struct drm_device * dev, 
drm_i915
                dev_priv->ring.map.flags = 0;
                dev_priv->ring.map.mtrr = 0;

-               drm_core_ioremap(&dev_priv->ring.map, dev);
+               drm_core_ioremap_wc(&dev_priv->ring.map, dev);

                if (dev_priv->ring.map.handle == NULL) {
                        i915_dma_cleanup(dev);


-- 
Jesse Barnes, Intel Open Source Technology Center
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