Re: [PATCH v6 16/19] drm/i915/userptr: Kill user_size limit check

["Goel, Akash" <akash.goel@intel.com>]

Reviewed the patch & it looks fine.
Reviewed-by: "Akash Goel <akash.goel@intel.com>"

On 7/29/2015 9:54 PM, Michel Thierry wrote:
> GTT was only 32b and its max value is 4GB. In order to allow objects
> bigger than 4GB in 48b PPGTT, i915_gem_userptr_ioctl we could check
> against max 48b range (1ULL << 48).
>
> But since the check no longer applies, just kill the limit.
>
> v2: Use the default ctx to infer the ppgtt max size (Akash).
> v3: Just kill the limit, it was only there for early detection of an
> error when used for execbuffer (Chris).
>
> Cc: Akash Goel <akash.goel@intel.com>
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Michel Thierry <michel.thierry@intel.com>
> ---
>   drivers/gpu/drm/i915/i915_gem_userptr.c | 4 ----
>   1 file changed, 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
> index 8fd431b..d11901d 100644
> --- a/drivers/gpu/drm/i915/i915_gem_userptr.c
> +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
> @@ -813,7 +813,6 @@ static const struct drm_i915_gem_object_ops i915_gem_userptr_ops = {
>   int
>   i915_gem_userptr_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
>   {
> -	struct drm_i915_private *dev_priv = dev->dev_private;
>   	struct drm_i915_gem_userptr *args = data;
>   	struct drm_i915_gem_object *obj;
>   	int ret;
> @@ -826,9 +825,6 @@ i915_gem_userptr_ioctl(struct drm_device *dev, void *data, struct drm_file *file
>   	if (offset_in_page(args->user_ptr | args->user_size))
>   		return -EINVAL;
>
> -	if (args->user_size > dev_priv->gtt.base.total)
> -		return -E2BIG;
> -
>   	if (!access_ok(args->flags & I915_USERPTR_READ_ONLY ? VERIFY_READ : VERIFY_WRITE,
>   		       (char __user *)(unsigned long)args->user_ptr, args->user_size))
>   		return -EFAULT;
>
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