Re: [PATCH] drm/i915: BIOS and power context stolen mem handling for VLV v4

[Chris Wilson <chris@chris-wilson.co.uk>]

On Tue, May 07, 2013 at 12:34:00PM -0700, Jesse Barnes wrote:
> But we need to get the right stolen base and make pre-allocated objects
> for BIOS stuff so we don't clobber it.  If the BIOS hasn't allocated a
> power context, we allocate one here too, from stolen space as required
> by the docs.
> 
> v2: fix stolen to phys if ladder (Ben)
>     keep BIOS reserved space out of allocator altogether (Ben)
> v3: fix mask of stolen base (Ben)
> v4: clean up preallocated object on unload (Ben)
>     don't zero reg on unload (Jesse)
>     fix mask harder (Jesse)
> 
> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/i915_drv.h        |    2 +
>  drivers/gpu/drm/i915/i915_gem_stolen.c |   69 +++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/i915_reg.h        |    1 +
>  3 files changed, 70 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index c81100c..2fe5fd4 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1073,6 +1073,8 @@ typedef struct drm_i915_private {
>  
>  	struct i915_gpu_error gpu_error;
>  
> +	struct drm_i915_gem_object *vlv_pctx;
> +
>  	/* list of fbdev register on this device */
>  	struct intel_fbdev *fbdev;
>  
> diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
> index 67d3510..02950bb 100644
> --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> @@ -62,7 +62,10 @@ static unsigned long i915_stolen_to_physical(struct drm_device *dev)
>  	 * its value of TOLUD.
>  	 */
>  	base = 0;
> -	if (INTEL_INFO(dev)->gen >= 6) {
> +	if (IS_VALLEYVIEW(dev)) {
> +		pci_read_config_dword(pdev, 0x5c, &base);
> +		base &= ~((1<<20) - 1);
> +	} else if (INTEL_INFO(dev)->gen >= 6) {
>  		/* Read Base Data of Stolen Memory Register (BDSM) directly.
>  		 * Note that there is also a MCHBAR miror at 0x1080c0 or
>  		 * we could use device 2:0x5c instead.
> @@ -172,17 +175,72 @@ void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
>  	dev_priv->cfb_size = 0;
>  }
>  
> +static void valleyview_setup_pctx(struct drm_device *dev)
> +{

This doesn't belong in i915_gem_stolen.c. It has nothing to do with the
management of stolen memory, it is just a user. It should be closer to
the other power contexts.

> +static void valleyview_cleanup_pctx(struct drm_device *dev)
> +{
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +
> +	if (!dev_priv->vlv_pctx)
> +		return;
> +
> +	i915_gem_object_release_stolen(dev_priv->vlv_pctx);

Cleanup should just be drm_gem_object_unreference();

> +}
> +
>  void i915_gem_cleanup_stolen(struct drm_device *dev)
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  
>  	i915_gem_stolen_cleanup_compression(dev);
> +	if (IS_VALLEYVIEW(dev))
> +		valleyview_cleanup_pctx(dev);
Not here, not like this.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre