[Intel-gfx] [PATCH 06/22] drm/i915: add power context allocation and setup on VLV

[Jani Nikula]

On Sat, 02 Feb 2013, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> The Gunit has a separate reg for this, so allocate some stolen space for
> the power context and initialize the reg.
>
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/i915_drv.h        |    2 ++
>  drivers/gpu/drm/i915/i915_gem_stolen.c |   41 ++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/i915_reg.h        |    1 +
>  3 files changed, 44 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index f4ae73d..34f01a9 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -928,6 +928,8 @@ typedef struct drm_i915_private {
>  	struct drm_mm_node *compressed_fb;
>  	struct drm_mm_node *compressed_llb;
>  
> +	struct drm_mm_node *vlv_pctx;
> +
>  	unsigned long last_gpu_reset;
>  
>  	/* list of fbdev register on this device */
> diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
> index f21ae17..ac11a41 100644
> --- a/drivers/gpu/drm/i915/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
> @@ -171,11 +171,49 @@ void i915_gem_stolen_cleanup_compression(struct drm_device *dev)
>  	dev_priv->cfb_size = 0;
>  }
>  
> +static void i915_setup_pctx(struct drm_device *dev)
> +{
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct drm_mm_node *pctx;
> +	unsigned long pctx_paddr;
> +	int pctx_size = 24*1024;
> +
> +	pctx = drm_mm_search_free(&dev_priv->mm.stolen, pctx_size, 4096, 0);
> +	if (pctx)
> +		pctx = drm_mm_get_block(pctx, pctx_size, 4096);
> +	if (!pctx)
> +		goto err;
> +
> +	pctx_paddr = dev_priv->mm.stolen_base + pctx->start;
> +	if (!pctx_paddr)
> +		goto err_free_pctx;
> +
> +	dev_priv->vlv_pctx = pctx;
> +	I915_WRITE(VLV_PCBR, pctx_paddr);
> +
> +	return;
> +
> +err_free_pctx:
> +	drm_mm_put_block(pctx);
> +err:
> +	DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
> +}
> +
> +static void i915_cleanup_pctx(struct drm_device *dev)
> +{
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +
> +	I915_WRITE(VLV_PCBR, 0);
> +	drm_mm_put_block(dev_priv->vlv_pctx);
> +}
> +
>  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) && i915_powersave)
> +		i915_cleanup_pctx(dev);

At least in theory dev_priv->vlv_pctx could be NULL here. Maybe make
dev_priv->vlv_pctx != NULL the condition here?

BR,
Jani.


>  	drm_mm_takedown(&dev_priv->mm.stolen);
>  }
>  
> @@ -193,6 +231,9 @@ int i915_gem_init_stolen(struct drm_device *dev)
>  	/* Basic memrange allocator for stolen space */
>  	drm_mm_init(&dev_priv->mm.stolen, 0, dev_priv->mm.gtt->stolen_size);
>  
> +	if (IS_VALLEYVIEW(dev) && i915_powersave)
> +		i915_setup_pctx(dev);
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 286bab3..c785750 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -561,6 +561,7 @@
>  #define ISR		0x020ac
>  #define VLV_GUNIT_CLOCK_GATE	0x182060
>  #define   GCFG_DIS		(1<<8)
> +#define VLV_PCBR	0x182120
>  #define VLV_IIR_RW	0x182084
>  #define VLV_IER		0x1820a0
>  #define VLV_IIR		0x1820a4
> -- 
> 1.7.9.5
>
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