[Intel-gfx] [PATCH 2/3] drm/i915/gtt: Allow >= 4GB sizes for vm.

[Daniel Vetter]

On Tue, May 12, 2015 at 10:35:09AM +0300, Mika Kuoppala wrote:
> We can have exactly 4GB sized ppgtt with 32bit system.
> size_t is inadequate for this.
> 
> Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>

A quick grep shows that there's still lots of size_t in gem code
(i915_gem.c, i915_gem_gtt.c and parts of i915_debugfs.c). I think we need
to convert them all to avoid overflow issues.
-Daniel

> ---
>  drivers/char/agp/intel-gtt.c        | 2 +-
>  drivers/gpu/drm/i915/i915_debugfs.c | 4 ++--
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 8 ++++----
>  drivers/gpu/drm/i915/i915_gem_gtt.h | 6 +++---
>  include/drm/intel-gtt.h             | 2 +-
>  5 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
> index 0b4188b..2f0396c 100644
> --- a/drivers/char/agp/intel-gtt.c
> +++ b/drivers/char/agp/intel-gtt.c
> @@ -1408,7 +1408,7 @@ int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev,
>  }
>  EXPORT_SYMBOL(intel_gmch_probe);
>  
> -void intel_gtt_get(size_t *gtt_total, size_t *stolen_size,
> +void intel_gtt_get(u64 *gtt_total, size_t *stolen_size,
>  		   phys_addr_t *mappable_base, unsigned long *mappable_end)
>  {
>  	*gtt_total = intel_private.gtt_total_entries << PAGE_SHIFT;
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index adbbdda..44175f6 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -474,9 +474,9 @@ static int i915_gem_object_info(struct seq_file *m, void* data)
>  	seq_printf(m, "%u fault mappable objects, %zu bytes\n",
>  		   count, size);
>  
> -	seq_printf(m, "%zu [%lu] gtt total\n",
> +	seq_printf(m, "%llu [%llu] gtt total\n",
>  		   dev_priv->gtt.base.total,
> -		   dev_priv->gtt.mappable_end - dev_priv->gtt.base.start);
> +		   (u64)dev_priv->gtt.mappable_end - dev_priv->gtt.base.start);
>  
>  	seq_putc(m, '\n');
>  	print_batch_pool_stats(m, dev_priv);
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 17b7df0..525d154 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -2347,7 +2347,7 @@ static void chv_setup_private_ppat(struct drm_i915_private *dev_priv)
>  }
>  
>  static int gen8_gmch_probe(struct drm_device *dev,
> -			   size_t *gtt_total,
> +			   u64 *gtt_total,
>  			   size_t *stolen,
>  			   phys_addr_t *mappable_base,
>  			   unsigned long *mappable_end)
> @@ -2395,7 +2395,7 @@ static int gen8_gmch_probe(struct drm_device *dev,
>  }
>  
>  static int gen6_gmch_probe(struct drm_device *dev,
> -			   size_t *gtt_total,
> +			   u64 *gtt_total,
>  			   size_t *stolen,
>  			   phys_addr_t *mappable_base,
>  			   unsigned long *mappable_end)
> @@ -2446,7 +2446,7 @@ static void gen6_gmch_remove(struct i915_address_space *vm)
>  }
>  
>  static int i915_gmch_probe(struct drm_device *dev,
> -			   size_t *gtt_total,
> +			   u64 *gtt_total,
>  			   size_t *stolen,
>  			   phys_addr_t *mappable_base,
>  			   unsigned long *mappable_end)
> @@ -2514,7 +2514,7 @@ int i915_gem_gtt_init(struct drm_device *dev)
>  	gtt->base.dev = dev;
>  
>  	/* GMADR is the PCI mmio aperture into the global GTT. */
> -	DRM_INFO("Memory usable by graphics device = %zdM\n",
> +	DRM_INFO("Memory usable by graphics device = %lluM\n",
>  		 gtt->base.total >> 20);
>  	DRM_DEBUG_DRIVER("GMADR size = %ldM\n", gtt->mappable_end >> 20);
>  	DRM_DEBUG_DRIVER("GTT stolen size = %zdM\n", gtt->stolen_size >> 20);
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
> index 0d46dd2..5786c7d 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> @@ -233,8 +233,8 @@ struct i915_address_space {
>  	struct drm_mm mm;
>  	struct drm_device *dev;
>  	struct list_head global_link;
> -	unsigned long start;		/* Start offset always 0 for dri2 */
> -	size_t total;		/* size addr space maps (ex. 2GB for ggtt) */
> +	u64 start;		/* Start offset always 0 for dri2 */
> +	u64 total;		/* size addr space maps (ex. 2GB for ggtt) */
>  
>  	struct {
>  		dma_addr_t addr;
> @@ -314,7 +314,7 @@ struct i915_gtt {
>  	int mtrr;
>  
>  	/* global gtt ops */
> -	int (*gtt_probe)(struct drm_device *dev, size_t *gtt_total,
> +	int (*gtt_probe)(struct drm_device *dev, u64 *gtt_total,
>  			  size_t *stolen, phys_addr_t *mappable_base,
>  			  unsigned long *mappable_end);
>  };
> diff --git a/include/drm/intel-gtt.h b/include/drm/intel-gtt.h
> index b08bdad..dbf4105 100644
> --- a/include/drm/intel-gtt.h
> +++ b/include/drm/intel-gtt.h
> @@ -3,7 +3,7 @@
>  #ifndef _DRM_INTEL_GTT_H
>  #define	_DRM_INTEL_GTT_H
>  
> -void intel_gtt_get(size_t *gtt_total, size_t *stolen_size,
> +void intel_gtt_get(u64 *gtt_total, size_t *stolen_size,
>  		   phys_addr_t *mappable_base, unsigned long *mappable_end);
>  
>  int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev,
> -- 
> 1.9.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch