linux-kernel - Re: [PATCH 2/2] drm/virtio: kms: use drm managed resources

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Date:   Thu, 11 Aug 2022 18:16:57 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Danilo Krummrich <dakr@...hat.com>
Cc:     airlied@...ux.ie, daniel@...ll.ch, kraxel@...hat.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/virtio: kms: use drm managed resources

On Thu, Jul 14, 2022 at 03:00:28PM +0200, Danilo Krummrich wrote:
> Allocate driver structures with drm managed resource allocators in order
> to cleanup/simplify the drm driver .release callback.
> 
> Signed-off-by: Danilo Krummrich <dakr@...hat.com>

On both patches:

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

I'm assuming you have commits rights or know someone who does :-)
-Daniel


> ---
>  drivers/gpu/drm/virtio/virtgpu_kms.c | 16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
> index 3313b92db531..63ebe63ef409 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_kms.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
> @@ -28,6 +28,7 @@
>  #include <linux/virtio_ring.h>
>  
>  #include <drm/drm_file.h>
> +#include <drm/drm_managed.h>
>  
>  #include "virtgpu_drv.h"
>  
> @@ -66,10 +67,11 @@ static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
>  {
>  	int i, ret;
>  	bool invalid_capset_id = false;
> +	struct drm_device *drm = vgdev->ddev;
>  
> -	vgdev->capsets = kcalloc(num_capsets,
> -				 sizeof(struct virtio_gpu_drv_capset),
> -				 GFP_KERNEL);
> +	vgdev->capsets = drmm_kcalloc(drm, num_capsets,
> +				      sizeof(struct virtio_gpu_drv_capset),
> +				      GFP_KERNEL);
>  	if (!vgdev->capsets) {
>  		DRM_ERROR("failed to allocate cap sets\n");
>  		return;
> @@ -94,7 +96,7 @@ static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
>  
>  		if (ret == 0 || invalid_capset_id) {
>  			spin_lock(&vgdev->display_info_lock);
> -			kfree(vgdev->capsets);
> +			drmm_kfree(drm, vgdev->capsets);
>  			vgdev->capsets = NULL;
>  			spin_unlock(&vgdev->display_info_lock);
>  			return;
> @@ -126,7 +128,7 @@ int virtio_gpu_init(struct drm_device *dev)
>  	if (!virtio_has_feature(dev_to_virtio(dev->dev), VIRTIO_F_VERSION_1))
>  		return -ENODEV;
>  
> -	vgdev = kzalloc(sizeof(struct virtio_gpu_device), GFP_KERNEL);
> +	vgdev = drmm_kzalloc(dev, sizeof(struct virtio_gpu_device), GFP_KERNEL);
>  	if (!vgdev)
>  		return -ENOMEM;
>  
> @@ -257,7 +259,6 @@ int virtio_gpu_init(struct drm_device *dev)
>  	vgdev->vdev->config->del_vqs(vgdev->vdev);
>  err_vqs:
>  	dev->dev_private = NULL;
> -	kfree(vgdev);
>  	return ret;
>  }
>  
> @@ -296,9 +297,6 @@ void virtio_gpu_release(struct drm_device *dev)
>  
>  	if (vgdev->has_host_visible)
>  		drm_mm_takedown(&vgdev->host_visible_mm);
> -
> -	kfree(vgdev->capsets);
> -	kfree(vgdev);
>  }
>  
>  int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
> -- 
> 2.36.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch