[PATCH] drm/vgem: Convert to a struct drm_device subclass

[Daniel Vetter]

On Tue, May 09, 2017 at 12:20:32PM -0700, Laura Abbott wrote:
> On 05/08/2017 06:22 AM, Chris Wilson wrote:
> > With Laura's introduction of the fake platform device for importing
> > dmabuf, we add a second static that is logically tied to the vgem_device.
> > Convert vgem over to using the struct drm_device subclassing, so that
> > the platform device is stored inside its owner.
> > 
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Laura Abbott <labbott at redhat.com>
> > Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> > ---
> >   drivers/gpu/drm/vgem/vgem_drv.c | 63 +++++++++++++++++++++++++++--------------
> >   1 file changed, 41 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
> > index c9381d457a03..4b23ba049632 100644
> > --- a/drivers/gpu/drm/vgem/vgem_drv.c
> > +++ b/drivers/gpu/drm/vgem/vgem_drv.c
> > @@ -42,7 +42,10 @@
> >   #define DRIVER_MAJOR	1
> >   #define DRIVER_MINOR	0
> > -static struct platform_device *vgem_platform;
> > +static struct vgem_device {
> > +	struct drm_device drm;
> > +	struct platform_device *platform;
> > +} *vgem_device;
> >   static void vgem_gem_free_object(struct drm_gem_object *obj)
> >   {
> > @@ -307,7 +310,9 @@ static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj)
> >   static struct drm_gem_object* vgem_prime_import(struct drm_device *dev,
> >   						struct dma_buf *dma_buf)
> >   {
> > -	return drm_gem_prime_import_dev(dev, dma_buf, &vgem_platform->dev);
> > +	struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm);
> > +
> > +	return drm_gem_prime_import_dev(dev, dma_buf, &vgem->platform->dev);
> >   }
> >   static struct drm_gem_object *vgem_prime_import_sg_table(struct drm_device *dev,
> > @@ -377,8 +382,19 @@ static int vgem_prime_mmap(struct drm_gem_object *obj,
> >   	return 0;
> >   }
> > +static void vgem_release(struct drm_device *dev)
> > +{
> > +	struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm);
> > +
> > +	platform_device_unregister(vgem->platform);
> > +	drm_dev_fini(&vgem->drm);
> > +
> > +	kfree(vgem);
> > +}
> > +
> >   static struct drm_driver vgem_driver = {
> >   	.driver_features		= DRIVER_GEM | DRIVER_PRIME,
> > +	.release			= vgem_release,
> >   	.open				= vgem_open,
> >   	.postclose			= vgem_postclose,
> >   	.gem_free_object_unlocked	= vgem_gem_free_object,
> > @@ -408,45 +424,48 @@ static struct drm_driver vgem_driver = {
> >   	.minor	= DRIVER_MINOR,
> >   };
> > -static struct drm_device *vgem_device;
> > -
> >   static int __init vgem_init(void)
> >   {
> >   	int ret;
> > -	vgem_device = drm_dev_alloc(&vgem_driver, NULL);
> > -	if (IS_ERR(vgem_device))
> > -		return PTR_ERR(vgem_device);
> > +	vgem_device = kzalloc(sizeof(*vgem_device), GFP_KERNEL);
> > +	if (!vgem_device)
> > +		return -ENOMEM;
> > -	vgem_platform = platform_device_register_simple("vgem",
> > -					-1, NULL, 0);
> > +	ret = drm_dev_init(&vgem_device->drm, &vgem_driver, NULL);
> > +	if (ret)
> > +		goto out_free;
> > -	if (!vgem_platform) {
> > +	vgem_device->platform =
> > +		platform_device_register_simple("vgem", -1, NULL, 0);
> > +	if (!vgem_device->platform) {
> >   		ret = -ENODEV;
> > -		goto out;
> > +		goto out_fini;
> >   	}
> > -	dma_coerce_mask_and_coherent(&vgem_platform->dev,
> > -					DMA_BIT_MASK(64));
> > +	dma_coerce_mask_and_coherent(&vgem_device->platform->dev,
> > +				     DMA_BIT_MASK(64));
> > -	ret  = drm_dev_register(vgem_device, 0);
> > +	/* Final step: expose the device/driver to userspace */
> > +	ret  = drm_dev_register(&vgem_device->drm, 0);
> >   	if (ret)
> > -		goto out_unref;
> > +		goto out_unregister;
> >   	return 0;
> > -out_unref:
> > -	platform_device_unregister(vgem_platform);
> > -out:
> > -	drm_dev_unref(vgem_device);
> > +out_unregister:
> > +	platform_device_unregister(vgem_device->platform);
> > +out_fini:
> > +	drm_dev_fini(&vgem_device->drm > +out_free:
> > +	kfree(vgem_device);
> >   	return ret;
> >   }
> >   static void __exit vgem_exit(void)
> >   {
> > -	platform_device_unregister(vgem_platform);
> > -	drm_dev_unregister(vgem_device);
> > -	drm_dev_unref(vgem_device);
> > +	drm_dev_unregister(&vgem_device->drm);
> > +	drm_dev_unref(&vgem_device->drm);
> >   }
> >   module_init(vgem_init);
> > 
> 
> Reviewed-by: Laura Abbott <labbott at redhat.com>

Applied, thanks for patch&review. Btw, I thought there was a small
0day/gcc issue that needs a fixup. Does this patch address it, or is there
some other patch I've failed to spot&apply?

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