linux-kernel - Re: [PATCH] drm/i915: fix corruptions on i8xx due to relaxed fencing

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Date:	Thu, 10 Mar 2011 08:52:34 +0100
From:	"Daniel Vetter" <daniel@...ll.ch>
To:	"Indan Zupancic" <indan@....nu>
Cc:	"Daniel Vetter" <daniel@...ll.ch>,
	"Daniel Vetter" <daniel.vetter@...ll.ch>,
	"Chris Wilson" <chris@...is-wilson.co.uk>,
	dri-devel@...ts.freedesktop.org,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/i915: fix corruptions on i8xx due to relaxed     
 fencing

Am Do, 10.03.2011, 06:06 schrieb Indan Zupancic:
> This isn't in rc8, can someone make sure it gets into 2.6.38-rc9/2.6.38?

The patch unfortunately broke gen4+ (more precisely: the unwritten abi
guarantee that userspace can tile buffers that don't have a complete last
tile row, as long as it promises not to touch it). Hence it got reverted.
It was just a enforcement check to prevent broken userspace from fooling
itself. The proper fix is to upgrade your userspace (libdrm +
xf86-video-intel).

[Aside: This only happens if you have new enough userspace that supports
relaxed tiling. Old userspace and new kernels are _not_ broken.]

Cheers, Daniel

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