[Intel-gfx] [RFC PATCH 1/2] drm/i915: Add a function to mmap framebuffer obj

[Andi Shyti]

Hi Nirmoy,

[...]

> +int i915_gem_fb_mmap(struct drm_i915_gem_object *obj, struct vm_area_struct *vma)
> +{
> +	struct drm_i915_private *i915 = to_i915(obj->base.dev);
> +	struct drm_device *dev = &i915->drm;
> +	struct i915_mmap_offset *mmo = NULL;
> +	enum i915_mmap_type mmap_type;
> +	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
> +
> +	if (drm_dev_is_unplugged(dev))
> +		return -ENODEV;
> +
> +	mmap_type = i915_ggtt_has_aperture(ggtt) ? I915_MMAP_TYPE_GTT : I915_MMAP_TYPE_WC;
> +	mmo = mmap_offset_attach(obj, mmap_type, NULL);
> +	if (!mmo)
> +		return -ENODEV;
> +
> +	obj = i915_gem_object_get(mmo->obj);

Where do we decrease the refcount?

Andi

> +	return i915_gem_object_mmap(obj, mmo, vma);
> +}
> +