linux-kernel - Re: [PATCH v2 2/2] drm/v3d: replace obj lookup steps with drm_gem_objects

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Date:   Mon, 5 Dec 2022 21:41:21 -0300
From:   Maíra Canal <mcanal@...lia.com>
To:     Melissa Wen <mwen@...lia.com>, emma@...olt.net, airlied@...il.com,
        daniel@...ll.ch
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        kernel-dev@...lia.com
Subject: Re: [PATCH v2 2/2] drm/v3d: replace obj lookup steps with
 drm_gem_objects_lookup

On 12/5/22 10:55, Melissa Wen wrote:
> As v3d_lookup_bos() performs the same steps as drm_gem_objects_lookup(),
> replace the explicit code in v3d to simply use the DRM function.
> 
> Signed-off-by: Melissa Wen <mwen@...lia.com>

Reviewed-by: Maíra Canal <mcanal@...lia.com>

Best Regards,
- Maíra Canal

> ---
>  drivers/gpu/drm/v3d/v3d_gem.c | 49 +++--------------------------------
>  1 file changed, 3 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
> index 31a37572c11d..6e152ef26358 100644
> --- a/drivers/gpu/drm/v3d/v3d_gem.c
> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
> @@ -299,10 +299,6 @@ v3d_lookup_bos(struct drm_device *dev,
>  	       u64 bo_handles,
>  	       u32 bo_count)
>  {
> -	u32 *handles;
> -	int ret = 0;
> -	int i;
> -
>  	job->bo_count = bo_count;
>  
>  	if (!job->bo_count) {
> @@ -313,48 +309,9 @@ v3d_lookup_bos(struct drm_device *dev,
>  		return -EINVAL;
>  	}
>  
> -	job->bo = kvmalloc_array(job->bo_count,
> -				 sizeof(struct drm_gem_dma_object *),
> -				 GFP_KERNEL | __GFP_ZERO);
> -	if (!job->bo) {
> -		DRM_DEBUG("Failed to allocate validated BO pointers\n");
> -		return -ENOMEM;
> -	}
> -
> -	handles = kvmalloc_array(job->bo_count, sizeof(u32), GFP_KERNEL);
> -	if (!handles) {
> -		ret = -ENOMEM;
> -		DRM_DEBUG("Failed to allocate incoming GEM handles\n");
> -		goto fail;
> -	}
> -
> -	if (copy_from_user(handles,
> -			   (void __user *)(uintptr_t)bo_handles,
> -			   job->bo_count * sizeof(u32))) {
> -		ret = -EFAULT;
> -		DRM_DEBUG("Failed to copy in GEM handles\n");
> -		goto fail;
> -	}
> -
> -	spin_lock(&file_priv->table_lock);
> -	for (i = 0; i < job->bo_count; i++) {
> -		struct drm_gem_object *bo = idr_find(&file_priv->object_idr,
> -						     handles[i]);
> -		if (!bo) {
> -			DRM_DEBUG("Failed to look up GEM BO %d: %d\n",
> -				  i, handles[i]);
> -			ret = -ENOENT;
> -			spin_unlock(&file_priv->table_lock);
> -			goto fail;
> -		}
> -		drm_gem_object_get(bo);
> -		job->bo[i] = bo;
> -	}
> -	spin_unlock(&file_priv->table_lock);
> -
> -fail:
> -	kvfree(handles);
> -	return ret;
> +	return drm_gem_objects_lookup(file_priv,
> +				      (void __user *)(uintptr_t)bo_handles,
> +				      job->bo_count, &job->bo);
>  }
>  
>  static void