linux-kernel - Re: [PATCH v2] drm/virtio: add drm

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Message-ID: <20200211083553.GU43062@phenom.ffwll.local>
Date:   Tue, 11 Feb 2020 09:35:53 +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 v2] drm/virtio: add drm_driver.release callback.

On Mon, Feb 10, 2020 at 11:08:19AM +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_display.c | 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 ++++++++-
>  5 files changed, 18 insertions(+), 2 deletions(-)
> 
> 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_display.c b/drivers/gpu/drm/virtio/virtgpu_display.c
> index 7b0f0643bb2d..af953db4a0c9 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_display.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_display.c
> @@ -368,6 +368,5 @@ void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev)
>  
>  	for (i = 0 ; i < vgdev->num_scanouts; ++i)
>  		kfree(vgdev->outputs[i].edid);
> -	drm_atomic_helper_shutdown(vgdev->ddev);
>  	drm_mode_config_cleanup(vgdev->ddev);
>  }
> 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)

Split lgtm, but again I think you want drm_dev_enter/exit. And maybe a
changelog.
-Daniel

> +{
> +	struct virtio_gpu_device *vgdev = dev->dev_private;
>  
>  	virtio_gpu_modeset_fini(vgdev);
>  	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