Re: [PATCH 19/25] drm: remove the dma_ioctl special-case

[David Herrmann <dh.herrmann@gmail.com>]

Hi

On Thu, Aug 8, 2013 at 3:41 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
> We might as well have a real ioctl function which checks for the
> callbacks. This seems to be a remnant from back in the days when each
> drm driver had their own complete ioctl table, with no shared core
> drm table at all.
>
> To make really sure no mis-guided user in a kms driver pops up again
> explicitly check for that in the new ioctl implementation.
>
> v2: Drop the unused variable I've accidentally left in the code,
> spotted by David Herrmann.
>
> Cc: David Herrmann <dh.herrmann@gmail.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Reviewed-by: David Herrmann <dh.herrmann@gmail.com>

Regards
David

> ---
>  drivers/gpu/drm/drm_bufs.c | 12 ++++++++++++
>  drivers/gpu/drm/drm_drv.c  |  6 +-----
>  include/drm/drmP.h         |  2 ++
>  3 files changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
> index f63133b..471e051d 100644
> --- a/drivers/gpu/drm/drm_bufs.c
> +++ b/drivers/gpu/drm/drm_bufs.c
> @@ -1455,6 +1455,18 @@ int drm_mapbufs(struct drm_device *dev, void *data,
>         return retcode;
>  }
>
> +int drm_dma_ioctl(struct drm_device *dev, void *data,
> +                 struct drm_file *file_priv)
> +{
> +       if (drm_core_check_feature(dev, DRIVER_MODESET))
> +               return -EINVAL;
> +
> +       if (dev->driver->dma_ioctl)
> +               return dev->driver->dma_ioctl(dev, data, file_priv);
> +       else
> +               return -EINVAL;
> +}
> +
>  struct drm_local_map *drm_getsarea(struct drm_device *dev)
>  {
>         struct drm_map_list *entry;
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 5b949a7..83078cd 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -106,8 +106,7 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
>         DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
>         DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
>         DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
> -       /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
> -       DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
> +       DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma_ioctl, DRM_AUTH),
>
>         DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
>
> @@ -395,9 +394,6 @@ long drm_ioctl(struct file *filp,
>
>         /* Do not trust userspace, use our own definition */
>         func = ioctl->func;
> -       /* is there a local override? */
> -       if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
> -               func = dev->driver->dma_ioctl;
>
>         if (!func) {
>                 DRM_DEBUG("no function\n");
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 5b9462d..2a2a5b7 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -1366,6 +1366,8 @@ extern int drm_freebufs(struct drm_device *dev, void *data,
>                         struct drm_file *file_priv);
>  extern int drm_mapbufs(struct drm_device *dev, void *data,
>                        struct drm_file *file_priv);
> +extern int drm_dma_ioctl(struct drm_device *dev, void *data,
> +                        struct drm_file *file_priv);
>
>                                 /* DMA support (drm_dma.h) */
>  extern int drm_legacy_dma_setup(struct drm_device *dev);
> --
> 1.8.3.2
>