linux-kernel - Re: [PATCH] drm/virtio: add drm

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Message-ID: <20200207134903.GD43062@phenom.ffwll.local>
Date:   Fri, 7 Feb 2020 14:49:03 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, gurchetansingh@...omium.org,
        olvaffe@...il.com, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/virtio: add drm_driver.release callback.

On Fri, Feb 07, 2020 at 01:14:20PM +0100, Gerd Hoffmann wrote:
> Split virtio_gpu_deinit(), move the drm shutdown and release to
> virtio_gpu_release().  Also free vbufs in case we can't queue them.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
>  drivers/gpu/drm/virtio/virtgpu_drv.c | 4 ++++
>  drivers/gpu/drm/virtio/virtgpu_kms.c | 5 +++++
>  drivers/gpu/drm/virtio/virtgpu_vq.c  | 9 ++++++++-
>  4 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
> index d278c8c50f39..09a485b001e7 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> @@ -217,6 +217,7 @@ extern struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS];
>  /* virtio_kms.c */
>  int virtio_gpu_init(struct drm_device *dev);
>  void virtio_gpu_deinit(struct drm_device *dev);
> +void virtio_gpu_release(struct drm_device *dev);
>  int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file);
>  void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file);
>  
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
> index 8cf27af3ad53..664a741a3b0b 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
> @@ -31,6 +31,7 @@
>  #include <linux/pci.h>
>  
>  #include <drm/drm.h>
> +#include <drm/drm_atomic_helper.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_file.h>
>  
> @@ -136,6 +137,7 @@ static void virtio_gpu_remove(struct virtio_device *vdev)
>  	struct drm_device *dev = vdev->priv;
>  
>  	drm_dev_unregister(dev);
> +	drm_atomic_helper_shutdown(dev);
>  	virtio_gpu_deinit(dev);
>  	drm_dev_put(dev);
>  }
> @@ -214,4 +216,6 @@ static struct drm_driver driver = {
>  	.major = DRIVER_MAJOR,
>  	.minor = DRIVER_MINOR,
>  	.patchlevel = DRIVER_PATCHLEVEL,
> +
> +	.release = virtio_gpu_release,
>  };
> diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
> index c1086df49816..b45d12e3db2a 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_kms.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
> @@ -240,6 +240,11 @@ void virtio_gpu_deinit(struct drm_device *dev)
>  	flush_work(&vgdev->config_changed_work);
>  	vgdev->vdev->config->reset(vgdev->vdev);
>  	vgdev->vdev->config->del_vqs(vgdev->vdev);
> +}
> +
> +void virtio_gpu_release(struct drm_device *dev)
> +{
> +	struct virtio_gpu_device *vgdev = dev->dev_private;
>  
>  	virtio_gpu_modeset_fini(vgdev);

This calls drm_atomic_helper_shutdown, probably want that in the remove
hook?  Everything else looks like it's in the right spot. So with that
call moved into the top of the deinit function above this is:

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


>  	virtio_gpu_free_vbufs(vgdev);
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index cc02fc4bab2a..cc674b45f904 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -330,6 +330,11 @@ static void virtio_gpu_queue_ctrl_sgs(struct virtio_gpu_device *vgdev,
>  	bool notify = false;
>  	int ret;
>  
> +	if (!vgdev->vqs_ready) {
> +		free_vbuf(vgdev, vbuf);
> +		return;
> +	}
> +
>  	if (vgdev->has_indirect)
>  		elemcnt = 1;
>  
> @@ -462,8 +467,10 @@ static void virtio_gpu_queue_cursor(struct virtio_gpu_device *vgdev,
>  	int ret;
>  	int outcnt;
>  
> -	if (!vgdev->vqs_ready)
> +	if (!vgdev->vqs_ready) {
> +		free_vbuf(vgdev, vbuf);
>  		return;
> +	}
>  
>  	sg_init_one(&ccmd, vbuf->buf, vbuf->size);
>  	sgs[0] = &ccmd;
> -- 
> 2.18.1
> 

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