[Intel-gfx] [PATCH 1/2] drm/i915: Infrastructure for supporting different GGTT views per object

[Daniel Vetter]

On Fri, Dec 05, 2014 at 12:11:45PM +0000, Tvrtko Ursulin wrote:
> +struct i915_ggtt_view {
> +	enum i915_ggtt_view_type type;
> +
> +	struct sg_table *pages;
> +};

Minor nit on semantics, not really worth a resend (except when you need
one anyway because of the detailed review): Imo the sg_table should be in
the vma directly, not in the gtt_view. Otherwise we can't just do a memcmp
if the view paramaters grow more fancy than just the type key. And maybe
call it sg_table, not pages, to avoid confusion with the real obj->pages
backing storage pointer.

Anyway just bikesheds ;-)
-Daniel

> +
> +extern const struct i915_ggtt_view i915_ggtt_view_normal;
> +
>  enum i915_cache_level;
> +
>  /**
>   * A VMA represents a GEM BO that is bound into an address space. Therefore, a
>   * VMA's presence cannot be guaranteed before binding, or after unbinding the
> @@ -129,6 +142,15 @@ struct i915_vma {
>  #define PTE_READ_ONLY	(1<<2)
>  	unsigned int bound : 4;
>  
> +	/**
> +	 * Support different GGTT views into the same object.
> +	 * This means there can be multiple VMA mappings per object and per VM.
> +	 * i915_ggtt_view_type is used to distinguish between those entries.
> +	 * The default one of zero (I915_GGTT_VIEW_NORMAL) is default and also
> +	 * assumed in GEM functions which take no ggtt view parameter.
> +	 */
> +	struct i915_ggtt_view ggtt_view;
> +
>  	/** This object's place on the active/inactive lists */
>  	struct list_head mm_list;
>  
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index c4536e1..f97479a 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -718,10 +718,8 @@ static u32 capture_pinned_bo(struct drm_i915_error_buffer *err,
>  			break;
>  
>  		list_for_each_entry(vma, &obj->vma_list, vma_link)
> -			if (vma->vm == vm && vma->pin_count > 0) {
> +			if (vma->vm == vm && vma->pin_count > 0)
>  				capture_bo(err++, vma);
> -				break;
> -			}
>  	}
>  
>  	return err - first;
> @@ -1096,10 +1094,8 @@ static void i915_gem_capture_vm(struct drm_i915_private *dev_priv,
>  
>  	list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
>  		list_for_each_entry(vma, &obj->vma_list, vma_link)
> -			if (vma->vm == vm && vma->pin_count > 0) {
> +			if (vma->vm == vm && vma->pin_count > 0)
>  				i++;
> -				break;
> -			}
>  	}
>  	error->pinned_bo_count[ndx] = i - error->active_bo_count[ndx];
>  
> -- 
> 2.1.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch