Re: [PATCH 2/5] drm: Compile out legacy chunks from struct drm_device

[Alex Deucher <alexdeucher@gmail.com>]

On Fri, Oct 30, 2020 at 6:11 AM Daniel Vetter <daniel.vetter@ffwll.ch> wrote:
>
> This means some very few #ifdef in code, but it allows us to
> enlist the compiler to make sure this stuff isn't used anymore.
>
> More important, only legacy drivers change drm_device (for the
> legacy_dev_list shadow attach management), therefore this is
> prep to allow modern drivers to have a const driver struct. Which
> is nice, because there's a ton of function pointers in there.
>
> Acked-by: Maxime Ripard <mripard@kernel.org>
> Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
> Review-by: Thomas Zimmermann <tzimmermann@suse.de>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

> ---
>  drivers/gpu/drm/drm_file.c   |  2 ++
>  drivers/gpu/drm/drm_vblank.c | 15 ++++++++++++---
>  include/drm/drm_drv.h        |  2 ++
>  3 files changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
> index 0ac4566ae3f4..b50380fa80ce 100644
> --- a/drivers/gpu/drm/drm_file.c
> +++ b/drivers/gpu/drm/drm_file.c
> @@ -258,9 +258,11 @@ void drm_file_free(struct drm_file *file)
>                   (long)old_encode_dev(file->minor->kdev->devt),
>                   atomic_read(&dev->open_count));
>
> +#ifdef CONFIG_DRM_LEGACY
>         if (drm_core_check_feature(dev, DRIVER_LEGACY) &&
>             dev->driver->preclose)
>                 dev->driver->preclose(dev, file);
> +#endif
>
>         if (drm_core_check_feature(dev, DRIVER_LEGACY))
>                 drm_legacy_lock_release(dev, file->filp);
> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> index ba7e741764aa..15e5ea436434 100644
> --- a/drivers/gpu/drm/drm_vblank.c
> +++ b/drivers/gpu/drm/drm_vblank.c
> @@ -210,9 +210,12 @@ static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe)
>
>                 if (crtc->funcs->get_vblank_counter)
>                         return crtc->funcs->get_vblank_counter(crtc);
> -       } else if (dev->driver->get_vblank_counter) {
> +       }
> +#ifdef CONFIG_DRM_LEGACY
> +       else if (dev->driver->get_vblank_counter) {
>                 return dev->driver->get_vblank_counter(dev, pipe);
>         }
> +#endif
>
>         return drm_vblank_no_hw_counter(dev, pipe);
>  }
> @@ -430,9 +433,12 @@ static void __disable_vblank(struct drm_device *dev, unsigned int pipe)
>
>                 if (crtc->funcs->disable_vblank)
>                         crtc->funcs->disable_vblank(crtc);
> -       } else {
> +       }
> +#ifdef CONFIG_DRM_LEGACY
> +       else {
>                 dev->driver->disable_vblank(dev, pipe);
>         }
> +#endif
>  }
>
>  /*
> @@ -1097,9 +1103,12 @@ static int __enable_vblank(struct drm_device *dev, unsigned int pipe)
>
>                 if (crtc->funcs->enable_vblank)
>                         return crtc->funcs->enable_vblank(crtc);
> -       } else if (dev->driver->enable_vblank) {
> +       }
> +#ifdef CONFIG_DRM_LEGACY
> +       else if (dev->driver->enable_vblank) {
>                 return dev->driver->enable_vblank(dev, pipe);
>         }
> +#endif
>
>         return -EINVAL;
>  }
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index c6d17550efc9..7af220226a25 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -498,6 +498,7 @@ struct drm_driver {
>          */
>         const struct file_operations *fops;
>
> +#ifdef CONFIG_DRM_LEGACY
>         /* Everything below here is for legacy driver, never use! */
>         /* private: */
>
> @@ -512,6 +513,7 @@ struct drm_driver {
>         int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
>         void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
>         int dev_priv_size;
> +#endif
>  };
>
>  void *__devm_drm_dev_alloc(struct device *parent, struct drm_driver *driver,
> --
> 2.28.0
>
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