[Intel-gfx] [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Chris Wilson]

On Tue, Apr 29, 2014 at 11:53:58AM +0200, Daniel Vetter wrote:
> Otherwise we'll end up spamming dmesg on every context creation on snb
> with vt-d enabled. This regression was introduced in
> 
> commit 246cbfb5fb9a1ca0997fbb135464c1ff5bb9c549
> Author: Ben Widawsky <benjamin.widawsky at intel.com>
> Date:   Fri Dec 6 14:11:14 2013 -0800
> 
>     drm/i915: Reorganize intel_enable_ppgtt
> 
> As the i915.enable_ppgtt is read-only it cannot be changed after the
> module is loaded and so we can perform an early sanitization of the
> values.
> 
> v2:
> - Add comment and pimp commit message (Chris)
> - Use the param consistently (Jani)
> 
> v3:
> - Fix init sequence on pre-gen6 by moving the sanitize_ppgtt call to
>   gtt_init. Fixes boot hangs on pre-gen6.
> - Add a debug output for the sanitize ppgtt mode.
> 
> References: https://lkml.org/lkml/2014/4/17/599
> Rererences: https://bugs.freedesktop.org/show_bug.cgi?id=77916
> Cc: Alessandro Suardi <alessandro.suardi at gmail.com>
> Cc: Ben Widawsky <ben at bwidawsk.net>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

I am pretty sure we only call i915_gem_gtt_init() once during driver
load... So let's try that r-b again.
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre