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

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

[Daniel Vetter]

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@intel.com>
Date:   Fri Dec 6 14:11:14 2013 -0800

    drm/i915: Reorganize intel_enable_ppgtt

References: https://lkml.org/lkml/2014/4/17/599
Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
Cc: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 0d514ff9b94c..47491c4a1181 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
 
 bool intel_enable_ppgtt(struct drm_device *dev, bool full)
 {
-	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+	if (i915.enable_ppgtt == 0)
 		return false;
 
 	if (i915.enable_ppgtt == 1 && full)
 		return false;
 
+	return true;
+}
+
+static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
+{
+	if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+		return 0;
+
+	if (i915.enable_ppgtt == 1)
+		return 1;
+
+	if (i915.enable_ppgtt == 2 && HAS_PPGTT(dev))
+		return 2;
+
 #ifdef CONFIG_INTEL_IOMMU
 	/* Disable ppgtt on SNB if VT-d is on. */
 	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
 		DRM_INFO("Disabling PPGTT because VT-d is on\n");
-		return false;
+		return 0;
 	}
 #endif
 
-	/* Full ppgtt disabled by default for now due to issues. */
-	if (full)
-		return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
-	else
-		return HAS_ALIASING_PPGTT(dev);
+	return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
 }
 
 
@@ -1157,6 +1167,8 @@ int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret = 0;
 
+	i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
+
 	ppgtt->base.dev = dev;
 	ppgtt->base.scratch = dev_priv->gtt.base.scratch;
 
-- 
1.9.2

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Chris Wilson]

On Tue, Apr 22, 2014 at 10:17:50PM +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@intel.com>
> Date:   Fri Dec 6 14:11:14 2013 -0800
> 
>     drm/i915: Reorganize intel_enable_ppgtt

I started to consider what would happen if i915.enable_ppgtt changed on
the fly, but then saw that it is 0400 and this pre-initialisation makes
a lot of sense. So maybe we could mention that here:

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.

> References: https://lkml.org/lkml/2014/4/17/599
> Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
> Cc: Ben Widawsky <ben@bwidawsk.net>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

If you care to add in some of the comments,
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

>  drivers/gpu/drm/i915/i915_gem_gtt.c | 26 +++++++++++++++++++-------
>  1 file changed, 19 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 0d514ff9b94c..47491c4a1181 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
>  
>  bool intel_enable_ppgtt(struct drm_device *dev, bool full)
>  {
> -	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
> +	if (i915.enable_ppgtt == 0)
>  		return false;
>  
>  	if (i915.enable_ppgtt == 1 && full)
>  		return false;
>  
> +	return true;
> +}
> +

/* i915.enable_ppgtt is read-only, so do an early pass to validate
 * the user's requested state against the hardware/driver capabilities.
 * We do this now so that we can print out any log messages once rather
 * than every time we check intel_enable_ppgtt().
 */
> +static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
> +{
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Daniel Vetter]

On Tue, Apr 22, 2014 at 10:22:15PM +0100, Chris Wilson wrote:
> On Tue, Apr 22, 2014 at 10:17:50PM +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@intel.com>
> > Date:   Fri Dec 6 14:11:14 2013 -0800
> > 
> >     drm/i915: Reorganize intel_enable_ppgtt
> 
> I started to consider what would happen if i915.enable_ppgtt changed on
> the fly, but then saw that it is 0400 and this pre-initialisation makes
> a lot of sense. So maybe we could mention that here:
> 
> 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.
> 
> > References: https://lkml.org/lkml/2014/4/17/599
> > Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
> > Cc: Ben Widawsky <ben@bwidawsk.net>
> > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> 
> If you care to add in some of the comments,
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

Fully agreed on both since the first thing I've checked is that the
enable_ppgtt option is indeed 0400 ;-)

Jani, can you please apply Chris' commit message text and comment when
merging?
-Daniel

> 
> >  drivers/gpu/drm/i915/i915_gem_gtt.c | 26 +++++++++++++++++++-------
> >  1 file changed, 19 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > index 0d514ff9b94c..47491c4a1181 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > @@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
> >  
> >  bool intel_enable_ppgtt(struct drm_device *dev, bool full)
> >  {
> > -	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
> > +	if (i915.enable_ppgtt == 0)
> >  		return false;
> >  
> >  	if (i915.enable_ppgtt == 1 && full)
> >  		return false;
> >  
> > +	return true;
> > +}
> > +
> 
> /* i915.enable_ppgtt is read-only, so do an early pass to validate
>  * the user's requested state against the hardware/driver capabilities.
>  * We do this now so that we can print out any log messages once rather
>  * than every time we check intel_enable_ppgtt().
>  */
> > +static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
> > +{
> -Chris
> 
> -- 
> Chris Wilson, Intel Open Source Technology Centre

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Jani Nikula]

On Tue, 22 Apr 2014, Daniel Vetter <daniel.vetter@ffwll.ch> 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@intel.com>
> Date:   Fri Dec 6 14:11:14 2013 -0800
>
>     drm/i915: Reorganize intel_enable_ppgtt
>
> References: https://lkml.org/lkml/2014/4/17/599
> Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
> Cc: Ben Widawsky <ben@bwidawsk.net>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 26 +++++++++++++++++++-------
>  1 file changed, 19 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 0d514ff9b94c..47491c4a1181 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
>  
>  bool intel_enable_ppgtt(struct drm_device *dev, bool full)
>  {
> -	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
> +	if (i915.enable_ppgtt == 0)
>  		return false;
>  
>  	if (i915.enable_ppgtt == 1 && full)
>  		return false;
>  
> +	return true;
> +}
> +
> +static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
> +{
> +	if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
> +		return 0;
> +
> +	if (i915.enable_ppgtt == 1)
> +		return 1;
> +
> +	if (i915.enable_ppgtt == 2 && HAS_PPGTT(dev))
> +		return 2;

You should probably either pass enable_ppgtt as parameter and use that
exclusively, or not pass it and refer to i915.enable_ppgtt directly, but
not mix them.

> +
>  #ifdef CONFIG_INTEL_IOMMU
>  	/* Disable ppgtt on SNB if VT-d is on. */
>  	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
>  		DRM_INFO("Disabling PPGTT because VT-d is on\n");
> -		return false;
> +		return 0;
>  	}
>  #endif
>  
> -	/* Full ppgtt disabled by default for now due to issues. */
> -	if (full)
> -		return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
> -	else
> -		return HAS_ALIASING_PPGTT(dev);
> +	return HAS_ALIASING_PPGTT(dev) ? 1 : 0;


This conflicts in -fixes due to
commit 8d214b7d9c45f4af23ce41b2bc74f79c44f760de
Author: Ben Widawsky <benjamin.widawsky@linux.intel.com>
Date:   Mon Mar 24 18:06:00 2014 -0700

    drm/i915: Allow full PPGTT with param override

Should I incorporate that in the conflict resolution for simplicity,
letting 3.15 users also play with full ppgtt with the module param?


BR,
Jani.


>  }
>  
>  
> @@ -1157,6 +1167,8 @@ int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	int ret = 0;
>  
> +	i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
> +
>  	ppgtt->base.dev = dev;
>  	ppgtt->base.scratch = dev_priv->gtt.base.scratch;
>  
> -- 
> 1.9.2
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Jani Nikula, Intel Open Source Technology Center

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Ben Widawsky]

On Wed, Apr 23, 2014 at 09:18:03AM +0200, Daniel Vetter wrote:
> On Tue, Apr 22, 2014 at 10:22:15PM +0100, Chris Wilson wrote:
> > On Tue, Apr 22, 2014 at 10:17:50PM +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@intel.com>
> > > Date:   Fri Dec 6 14:11:14 2013 -0800
> > > 
> > >     drm/i915: Reorganize intel_enable_ppgtt
> > 
> > I started to consider what would happen if i915.enable_ppgtt changed on
> > the fly, but then saw that it is 0400 and this pre-initialisation makes
> > a lot of sense. So maybe we could mention that here:
> > 
> > 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.
> > 
> > > References: https://lkml.org/lkml/2014/4/17/599
> > > Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
> > > Cc: Ben Widawsky <ben@bwidawsk.net>
> > > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > 
> > If you care to add in some of the comments,
> > Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
> 
> Fully agreed on both since the first thing I've checked is that the
> enable_ppgtt option is indeed 0400 ;-)
> 
> Jani, can you please apply Chris' commit message text and comment when
> merging?
> -Daniel

Here as well:
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>



> 
> > 
> > >  drivers/gpu/drm/i915/i915_gem_gtt.c | 26 +++++++++++++++++++-------
> > >  1 file changed, 19 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > > index 0d514ff9b94c..47491c4a1181 100644
> > > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > > @@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
> > >  
> > >  bool intel_enable_ppgtt(struct drm_device *dev, bool full)
> > >  {
> > > -	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
> > > +	if (i915.enable_ppgtt == 0)
> > >  		return false;
> > >  
> > >  	if (i915.enable_ppgtt == 1 && full)
> > >  		return false;
> > >  
> > > +	return true;
> > > +}
> > > +
> > 
> > /* i915.enable_ppgtt is read-only, so do an early pass to validate
> >  * the user's requested state against the hardware/driver capabilities.
> >  * We do this now so that we can print out any log messages once rather
> >  * than every time we check intel_enable_ppgtt().
> >  */
> > > +static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
> > > +{
> > -Chris
> > 
> > -- 
> > Chris Wilson, Intel Open Source Technology Centre
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch

-- 
Ben Widawsky, Intel Open Source Technology Center

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

[Daniel Vetter]

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@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)

References: https://lkml.org/lkml/2014/4/17/599
Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
Cc: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 0d514ff9b94c..70e8892f81a6 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
 
 bool intel_enable_ppgtt(struct drm_device *dev, bool full)
 {
-	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+	if (i915.enable_ppgtt == 0)
 		return false;
 
 	if (i915.enable_ppgtt == 1 && full)
 		return false;
 
+	return true;
+}
+
+static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
+{
+	if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+		return 0;
+
+	if (enable_ppgtt == 1)
+		return 1;
+
+	if (enable_ppgtt == 2 && HAS_PPGTT(dev))
+		return 2;
+
 #ifdef CONFIG_INTEL_IOMMU
 	/* Disable ppgtt on SNB if VT-d is on. */
 	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
 		DRM_INFO("Disabling PPGTT because VT-d is on\n");
-		return false;
+		return 0;
 	}
 #endif
 
-	/* Full ppgtt disabled by default for now due to issues. */
-	if (full)
-		return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
-	else
-		return HAS_ALIASING_PPGTT(dev);
+	return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
 }
 
 
@@ -1157,6 +1167,14 @@ int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret = 0;
 
+	/*
+	 * i915.enable_ppgtt is read-only, so do an early pass to validate the
+	 * user's requested state against the hardware/driver capabilities.  We
+	 * do this now so that we can print out any log messages once rather
+	 * than every time we check intel_enable_ppgtt().
+	 */
+	i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
+
 	ppgtt->base.dev = dev;
 	ppgtt->base.scratch = dev_priv->gtt.base.scratch;
 
-- 
1.9.2

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Daniel Vetter]

On Wed, Apr 23, 2014 at 11:37:46AM +0300, Jani Nikula wrote:
> On Tue, 22 Apr 2014, Daniel Vetter <daniel.vetter@ffwll.ch> 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@intel.com>
> > Date:   Fri Dec 6 14:11:14 2013 -0800
> >
> >     drm/i915: Reorganize intel_enable_ppgtt
> >
> > References: https://lkml.org/lkml/2014/4/17/599
> > Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
> > Cc: Ben Widawsky <ben@bwidawsk.net>
> > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > ---
> >  drivers/gpu/drm/i915/i915_gem_gtt.c | 26 +++++++++++++++++++-------
> >  1 file changed, 19 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > index 0d514ff9b94c..47491c4a1181 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > @@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
> >  
> >  bool intel_enable_ppgtt(struct drm_device *dev, bool full)
> >  {
> > -	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
> > +	if (i915.enable_ppgtt == 0)
> >  		return false;
> >  
> >  	if (i915.enable_ppgtt == 1 && full)
> >  		return false;
> >  
> > +	return true;
> > +}
> > +
> > +static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
> > +{
> > +	if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
> > +		return 0;
> > +
> > +	if (i915.enable_ppgtt == 1)
> > +		return 1;
> > +
> > +	if (i915.enable_ppgtt == 2 && HAS_PPGTT(dev))
> > +		return 2;
> 
> You should probably either pass enable_ppgtt as parameter and use that
> exclusively, or not pass it and refer to i915.enable_ppgtt directly, but
> not mix them.

New patch on its way with Chris' comments also applied.
> 
> > +
> >  #ifdef CONFIG_INTEL_IOMMU
> >  	/* Disable ppgtt on SNB if VT-d is on. */
> >  	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
> >  		DRM_INFO("Disabling PPGTT because VT-d is on\n");
> > -		return false;
> > +		return 0;
> >  	}
> >  #endif
> >  
> > -	/* Full ppgtt disabled by default for now due to issues. */
> > -	if (full)
> > -		return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
> > -	else
> > -		return HAS_ALIASING_PPGTT(dev);
> > +	return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
> 
> 
> This conflicts in -fixes due to
> commit 8d214b7d9c45f4af23ce41b2bc74f79c44f760de
> Author: Ben Widawsky <benjamin.widawsky@linux.intel.com>
> Date:   Mon Mar 24 18:06:00 2014 -0700
> 
>     drm/i915: Allow full PPGTT with param override
> 
> Should I incorporate that in the conflict resolution for simplicity,
> letting 3.15 users also play with full ppgtt with the module param?

Yeah I guess it's easiest to just cherry-pick that one to -fixes, too.
-Daniel

> 
> 
> BR,
> Jani.
> 
> 
> >  }
> >  
> >  
> > @@ -1157,6 +1167,8 @@ int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
> >  	struct drm_i915_private *dev_priv = dev->dev_private;
> >  	int ret = 0;
> >  
> > +	i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
> > +
> >  	ppgtt->base.dev = dev;
> >  	ppgtt->base.scratch = dev_priv->gtt.base.scratch;
> >  
> > -- 
> > 1.9.2
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Jani Nikula]

On Wed, 23 Apr 2014, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Wed, Apr 23, 2014 at 11:37:46AM +0300, Jani Nikula wrote:
>> On Tue, 22 Apr 2014, Daniel Vetter <daniel.vetter@ffwll.ch> 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@intel.com>
>> > Date:   Fri Dec 6 14:11:14 2013 -0800
>> >
>> >     drm/i915: Reorganize intel_enable_ppgtt
>> >
>> > References: https://lkml.org/lkml/2014/4/17/599
>> > Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
>> > Cc: Ben Widawsky <ben@bwidawsk.net>
>> > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>> > ---
>> >  drivers/gpu/drm/i915/i915_gem_gtt.c | 26 +++++++++++++++++++-------
>> >  1 file changed, 19 insertions(+), 7 deletions(-)
>> >
>> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
>> > index 0d514ff9b94c..47491c4a1181 100644
>> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
>> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
>> > @@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
>> >  
>> >  bool intel_enable_ppgtt(struct drm_device *dev, bool full)
>> >  {
>> > -	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
>> > +	if (i915.enable_ppgtt == 0)
>> >  		return false;
>> >  
>> >  	if (i915.enable_ppgtt == 1 && full)
>> >  		return false;
>> >  
>> > +	return true;
>> > +}
>> > +
>> > +static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
>> > +{
>> > +	if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
>> > +		return 0;
>> > +
>> > +	if (i915.enable_ppgtt == 1)
>> > +		return 1;
>> > +
>> > +	if (i915.enable_ppgtt == 2 && HAS_PPGTT(dev))
>> > +		return 2;
>> 
>> You should probably either pass enable_ppgtt as parameter and use that
>> exclusively, or not pass it and refer to i915.enable_ppgtt directly, but
>> not mix them.
>
> New patch on its way with Chris' comments also applied.
>> 
>> > +
>> >  #ifdef CONFIG_INTEL_IOMMU
>> >  	/* Disable ppgtt on SNB if VT-d is on. */
>> >  	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
>> >  		DRM_INFO("Disabling PPGTT because VT-d is on\n");
>> > -		return false;
>> > +		return 0;
>> >  	}
>> >  #endif
>> >  
>> > -	/* Full ppgtt disabled by default for now due to issues. */
>> > -	if (full)
>> > -		return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
>> > -	else
>> > -		return HAS_ALIASING_PPGTT(dev);
>> > +	return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
>> 
>> 
>> This conflicts in -fixes due to
>> commit 8d214b7d9c45f4af23ce41b2bc74f79c44f760de
>> Author: Ben Widawsky <benjamin.widawsky@linux.intel.com>
>> Date:   Mon Mar 24 18:06:00 2014 -0700
>> 
>>     drm/i915: Allow full PPGTT with param override
>> 
>> Should I incorporate that in the conflict resolution for simplicity,
>> letting 3.15 users also play with full ppgtt with the module param?
>
> Yeah I guess it's easiest to just cherry-pick that one to -fixes, too.
> -Daniel

Pushed v2 to -fixes, along with "drm/i915: Allow full PPGTT with param
override". Thanks for the patch and review.

BR,
Jani.


>
>> 
>> 
>> BR,
>> Jani.
>> 
>> 
>> >  }
>> >  
>> >  
>> > @@ -1157,6 +1167,8 @@ int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
>> >  	struct drm_i915_private *dev_priv = dev->dev_private;
>> >  	int ret = 0;
>> >  
>> > +	i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
>> > +
>> >  	ppgtt->base.dev = dev;
>> >  	ppgtt->base.scratch = dev_priv->gtt.base.scratch;
>> >  
>> > -- 
>> > 1.9.2
>> >
>> > _______________________________________________
>> > Intel-gfx mailing list
>> > Intel-gfx@lists.freedesktop.org
>> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>> 
>> -- 
>> Jani Nikula, Intel Open Source Technology Center
>
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch

-- 
Jani Nikula, Intel Open Source Technology Center

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Jani Nikula]

On Thu, 24 Apr 2014, Jani Nikula <jani.nikula@linux.intel.com> wrote:
> On Wed, 23 Apr 2014, Daniel Vetter <daniel@ffwll.ch> wrote:
>> On Wed, Apr 23, 2014 at 11:37:46AM +0300, Jani Nikula wrote:
>>> On Tue, 22 Apr 2014, Daniel Vetter <daniel.vetter@ffwll.ch> 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@intel.com>
>>> > Date:   Fri Dec 6 14:11:14 2013 -0800
>>> >
>>> >     drm/i915: Reorganize intel_enable_ppgtt
>>> >
>>> > References: https://lkml.org/lkml/2014/4/17/599
>>> > Cc: Alessandro Suardi <alessandro.suardi@gmail.com>
>>> > Cc: Ben Widawsky <ben@bwidawsk.net>
>>> > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>>> > ---
>>> >  drivers/gpu/drm/i915/i915_gem_gtt.c | 26 +++++++++++++++++++-------
>>> >  1 file changed, 19 insertions(+), 7 deletions(-)
>>> >
>>> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
>>> > index 0d514ff9b94c..47491c4a1181 100644
>>> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
>>> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
>>> > @@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
>>> >  
>>> >  bool intel_enable_ppgtt(struct drm_device *dev, bool full)
>>> >  {
>>> > -	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
>>> > +	if (i915.enable_ppgtt == 0)
>>> >  		return false;
>>> >  
>>> >  	if (i915.enable_ppgtt == 1 && full)
>>> >  		return false;
>>> >  
>>> > +	return true;
>>> > +}
>>> > +
>>> > +static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
>>> > +{
>>> > +	if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
>>> > +		return 0;
>>> > +
>>> > +	if (i915.enable_ppgtt == 1)
>>> > +		return 1;
>>> > +
>>> > +	if (i915.enable_ppgtt == 2 && HAS_PPGTT(dev))
>>> > +		return 2;
>>> 
>>> You should probably either pass enable_ppgtt as parameter and use that
>>> exclusively, or not pass it and refer to i915.enable_ppgtt directly, but
>>> not mix them.
>>
>> New patch on its way with Chris' comments also applied.
>>> 
>>> > +
>>> >  #ifdef CONFIG_INTEL_IOMMU
>>> >  	/* Disable ppgtt on SNB if VT-d is on. */
>>> >  	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
>>> >  		DRM_INFO("Disabling PPGTT because VT-d is on\n");
>>> > -		return false;
>>> > +		return 0;
>>> >  	}
>>> >  #endif
>>> >  
>>> > -	/* Full ppgtt disabled by default for now due to issues. */
>>> > -	if (full)
>>> > -		return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
>>> > -	else
>>> > -		return HAS_ALIASING_PPGTT(dev);
>>> > +	return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
>>> 
>>> 
>>> This conflicts in -fixes due to
>>> commit 8d214b7d9c45f4af23ce41b2bc74f79c44f760de
>>> Author: Ben Widawsky <benjamin.widawsky@linux.intel.com>
>>> Date:   Mon Mar 24 18:06:00 2014 -0700
>>> 
>>>     drm/i915: Allow full PPGTT with param override
>>> 
>>> Should I incorporate that in the conflict resolution for simplicity,
>>> letting 3.15 users also play with full ppgtt with the module param?
>>
>> Yeah I guess it's easiest to just cherry-pick that one to -fixes, too.
>> -Daniel
>
> Pushed v2 to -fixes, along with "drm/i915: Allow full PPGTT with param
> override". Thanks for the patch and review.

And yanked out again due to [1]. Back to the drawing board. Please also
add a ppgtt sanity check BUG_ON before returning true from
intel_enable_ppgtt().

BR,
Jani.


[1] https://bugs.freedesktop.org/show_bug.cgi?id=77916

-- 
Jani Nikula, Intel Open Source Technology Center

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

[Daniel Vetter]

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@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@gmail.com>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 0d514ff9b94c..be504c1443ac 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -34,25 +34,35 @@ static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
 
 bool intel_enable_ppgtt(struct drm_device *dev, bool full)
 {
-	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+	if (i915.enable_ppgtt == 0)
 		return false;
 
 	if (i915.enable_ppgtt == 1 && full)
 		return false;
 
+	return true;
+}
+
+static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
+{
+	if (enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
+		return 0;
+
+	if (enable_ppgtt == 1)
+		return 1;
+
+	if (enable_ppgtt == 2 && HAS_PPGTT(dev))
+		return 2;
+
 #ifdef CONFIG_INTEL_IOMMU
 	/* Disable ppgtt on SNB if VT-d is on. */
 	if (INTEL_INFO(dev)->gen == 6 && intel_iommu_gfx_mapped) {
 		DRM_INFO("Disabling PPGTT because VT-d is on\n");
-		return false;
+		return 0;
 	}
 #endif
 
-	/* Full ppgtt disabled by default for now due to issues. */
-	if (full)
-		return HAS_PPGTT(dev) && (i915.enable_ppgtt == 2);
-	else
-		return HAS_ALIASING_PPGTT(dev);
+	return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
 }
 
 
@@ -1966,6 +1976,14 @@ int i915_gem_gtt_init(struct drm_device *dev)
 	if (intel_iommu_gfx_mapped)
 		DRM_INFO("VT-d active for gfx access\n");
 #endif
+	/*
+	 * i915.enable_ppgtt is read-only, so do an early pass to validate the
+	 * user's requested state against the hardware/driver capabilities.  We
+	 * do this now so that we can print out any log messages once rather
+	 * than every time we check intel_enable_ppgtt().
+	 */
+	i915.enable_ppgtt = sanitize_enable_ppgtt(dev, i915.enable_ppgtt);
+	DRM_DEBUG_DRIVER("ppgtt mode: %i\n", i915.enable_ppgtt);
 
 	return 0;
 }
-- 
1.9.2

Re: [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@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@gmail.com>
> Cc: Ben Widawsky <ben@bwidawsk.net>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Daniel Vetter <daniel.vetter@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@chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Alessandro Suardi]

On Tue, Apr 29, 2014 at 12:44 PM, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> 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@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@gmail.com>
>> Cc: Ben Widawsky <ben@bwidawsk.net>
>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>> Signed-off-by: Daniel Vetter <daniel.vetter@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@chris-wilson.co.uk>
> -Chris

I'd like to add my Tested-By, but this patch doesn't apply cleanly to
 3.15-rc3 - is there any prerequisite patch on top of -rc3 or should I
 use a git tree to test this fix ?

Offtopic, this email has a tiny typo (Rererences in the freedesktop
 bug ID line), just in case git actually stores that kind of metadata :)


thanks,

--alessandro

"don't underestimate the things that I will do"

 (Adele, "Rolling In The Deep")

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Jani Nikula]

On Tue, 29 Apr 2014, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> 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@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@gmail.com>
>> Cc: Ben Widawsky <ben@bwidawsk.net>
>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>> Signed-off-by: Daniel Vetter <daniel.vetter@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@chris-wilson.co.uk>

Pushed to -fixes, thanks for the patch and review.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Daniel Vetter]

On Tue, Apr 29, 2014 at 02:23:56PM +0200, Alessandro Suardi wrote:
> On Tue, Apr 29, 2014 at 12:44 PM, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> > 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@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@gmail.com>
> >> Cc: Ben Widawsky <ben@bwidawsk.net>
> >> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> >> Signed-off-by: Daniel Vetter <daniel.vetter@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@chris-wilson.co.uk>
> > -Chris
> 
> I'd like to add my Tested-By, but this patch doesn't apply cleanly to
>  3.15-rc3 - is there any prerequisite patch on top of -rc3 or should I
>  use a git tree to test this fix ?

It needs one patch from drm-intel-fixes, probably easiest if you just grab
that git tree. Or grab the relevant patch

http://cgit.freedesktop.org/drm-intel/commit/?id=0f9dc59db6abc475dc23afc077fabbc606b8830f

> Offtopic, this email has a tiny typo (Rererences in the freedesktop
>  bug ID line), just in case git actually stores that kind of metadata :)

Jani, can you please rectify this?

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

Re: [PATCH] drm/i915: Sanitize the enable_ppgtt module option once

[Jani Nikula]

On Tue, 29 Apr 2014, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Tue, Apr 29, 2014 at 02:23:56PM +0200, Alessandro Suardi wrote:
>> Offtopic, this email has a tiny typo (Rererences in the freedesktop
>>  bug ID line), just in case git actually stores that kind of metadata :)
>
> Jani, can you please rectify this?

Done.

-- 
Jani Nikula, Intel Open Source Technology Center