linux-kernel - [ 120/171] drm/i915: dont pwrite tiled objects through the gtt

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Date:	Tue, 15 Jan 2013 14:44:45 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Julien Cristau <jcristau@...ian.org>
Subject: [ 120/171] drm/i915: dont pwrite tiled objects through the gtt

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Vetter <daniel.vetter@...ll.ch>

commit c07496fa61f4c5cb2addd1c57f6b22fcaeea2eeb upstream.

... we will botch up the bit17 swizzling. Furthermore tiled pwrite is
a (now) unused slowpath, so no one really cares.

This fixes the last swizzling issues I have with i-g-t on my bit17
swizzling i915G. No regression, it's been broken since the dawn of
gem, but it's nice for regression tracking when really _all_ i-g-t
tests work.

Actually this is not true, Chris Wilson noticed while reviewing this
patch that the commit

commit d9e86c0ee60f323e890484628f351bf50fa9a15d
Author: Chris Wilson <chris@...is-wilson.co.uk>
Date:   Wed Nov 10 16:40:20 2010 +0000

    drm/i915: Pipelined fencing [infrastructure]

contained a functional change that broke things.

Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@...ll.ch>
[jcristau: adjust context for 3.4]
Signed-off-by: Julien Cristau <jcristau@...ian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/i915/i915_gem.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -928,6 +928,7 @@ i915_gem_pwrite_ioctl(struct drm_device
 	}
 
 	if (obj->gtt_space &&
+	    obj->tiling_mode == I915_TILING_NONE &&
 	    obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
 		ret = i915_gem_object_pin(obj, 0, true);
 		if (ret)


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