linux-kernel - Re: [PATCH v3 1/2] drm: Add DRM_GEM

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Date:   Fri, 24 Jun 2022 22:48:59 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Chris Healy <cphealy@...il.com>,
        Rob Clark <robdclark@...omium.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] drm: Add DRM_GEM_FOPS

On Thu, Jun 09, 2022 at 10:42:11AM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> The DEFINE_DRM_GEM_FOPS() helper is a bit limiting if a driver wants to
> provide additional file ops, like show_fdinfo().
> 
> v2: Split out DRM_GEM_FOPS instead of making DEFINE_DRM_GEM_FOPS
>     varardic
> v3: nits
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

We're at three drivers, maybe it'd be better if this is more standardized?
I feel like we're opening a bit a can of worms here where everyone just
has some good odl fashioned fun. It's at least much better documented than
the old property proliferation :-)
-Daniel

> ---
>  include/drm/drm_gem.h | 26 ++++++++++++++++++--------
>  1 file changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index 9d7c61a122dc..87cffc9efa85 100644
> --- a/include/drm/drm_gem.h
> +++ b/include/drm/drm_gem.h
> @@ -314,6 +314,23 @@ struct drm_gem_object {
>  	const struct drm_gem_object_funcs *funcs;
>  };
>  
> +/**
> + * DRM_GEM_FOPS - Default drm GEM file operations
> + *
> + * This macro provides a shorthand for setting the GEM file ops in the
> + * &file_operations structure.  If all you need are the default ops, use
> + * DEFINE_DRM_GEM_FOPS instead.
> + */
> +#define DRM_GEM_FOPS \
> +	.open		= drm_open,\
> +	.release	= drm_release,\
> +	.unlocked_ioctl	= drm_ioctl,\
> +	.compat_ioctl	= drm_compat_ioctl,\
> +	.poll		= drm_poll,\
> +	.read		= drm_read,\
> +	.llseek		= noop_llseek,\
> +	.mmap		= drm_gem_mmap
> +
>  /**
>   * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers
>   * @name: name for the generated structure
> @@ -330,14 +347,7 @@ struct drm_gem_object {
>  #define DEFINE_DRM_GEM_FOPS(name) \
>  	static const struct file_operations name = {\
>  		.owner		= THIS_MODULE,\
> -		.open		= drm_open,\
> -		.release	= drm_release,\
> -		.unlocked_ioctl	= drm_ioctl,\
> -		.compat_ioctl	= drm_compat_ioctl,\
> -		.poll		= drm_poll,\
> -		.read		= drm_read,\
> -		.llseek		= noop_llseek,\
> -		.mmap		= drm_gem_mmap,\
> +		DRM_GEM_FOPS,\
>  	}
>  
>  void drm_gem_object_release(struct drm_gem_object *obj);
> -- 
> 2.36.1
> 

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