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SubjectRe: [PATCH v3 1/2] drm: Add DRM_GEM_FOPS
On Fri, Jun 24, 2022 at 1:49 PM Daniel Vetter <daniel@ffwll.ch> wrote:
>
> On Thu, Jun 09, 2022 at 10:42:11AM -0700, Rob Clark wrote:
> > From: Rob Clark <robdclark@chromium.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@chromium.org>
> > Acked-by: Thomas Zimmermann <tzimmermann@suse.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 :-)

yeah, we could have a standardized drm_show_fdinfo() fop plus
drm_driver callback.. at this point the drm core fxn would be rather
boring, ie. only printing dev->driver->name, so I didn't pursue that
approach (yet?).. but perhaps that changes over time. I think we
chose the right approach here, focusing on the documentation first so
that userspace has a standardized experience. The kernel side of
things, we are free to refactor at any time ;-)

BR,
-R

> -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

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