linux-kernel - Re: [PATCH v4 1/2] drm/gem: Rename drm_gem_dumb_map_offset() to drm_gem_map

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Date:   Thu, 27 Jun 2019 23:35:27 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Rob Herring <robh@...nel.org>
Cc:     Steven Price <steven.price@....com>,
        Daniel Vetter <daniel@...ll.ch>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        David Airlie <airlied@...ux.ie>,
        Inki Dae <inki.dae@...sung.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] drm/gem: Rename drm_gem_dumb_map_offset() to
 drm_gem_map_offset()

On Thu, Jun 27, 2019 at 11:57:34AM -0600, Rob Herring wrote:
> On Thu, Jun 27, 2019 at 9:53 AM Steven Price <steven.price@....com> wrote:
> >
> > drm_gem_dumb_map_offset() is a useful helper for non-dumb clients, so
> > rename it to remove the _dumb and add a comment that it can be used by
> > shmem clients.
> >
> > Signed-off-by: Steven Price <steven.price@....com>
> > ---
> >  drivers/gpu/drm/drm_dumb_buffers.c      | 4 ++--
> >  drivers/gpu/drm/drm_gem.c               | 9 ++++++---
> >  drivers/gpu/drm/exynos/exynos_drm_gem.c | 3 +--
> >  include/drm/drm_gem.h                   | 4 ++--
> >  4 files changed, 11 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_dumb_buffers.c b/drivers/gpu/drm/drm_dumb_buffers.c
> > index d18a740fe0f1..b55cfc9e8772 100644
> > --- a/drivers/gpu/drm/drm_dumb_buffers.c
> > +++ b/drivers/gpu/drm/drm_dumb_buffers.c
> > @@ -48,7 +48,7 @@
> >   * To support dumb objects drivers must implement the &drm_driver.dumb_create
> >   * operation. &drm_driver.dumb_destroy defaults to drm_gem_dumb_destroy() if
> >   * not set and &drm_driver.dumb_map_offset defaults to
> > - * drm_gem_dumb_map_offset(). See the callbacks for further details.
> > + * drm_gem_map_offset(). See the callbacks for further details.
> >   *
> >   * Note that dumb objects may not be used for gpu acceleration, as has been
> >   * attempted on some ARM embedded platforms. Such drivers really must have
> > @@ -127,7 +127,7 @@ int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
> >                                                     args->handle,
> >                                                     &args->offset);
> >         else
> > -               return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
> > +               return drm_gem_map_offset(file_priv, dev, args->handle,
> >                                                &args->offset);
> >  }
> >
> > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > index a8c4468f03d9..62842b7701bb 100644
> > --- a/drivers/gpu/drm/drm_gem.c
> > +++ b/drivers/gpu/drm/drm_gem.c
> > @@ -298,7 +298,7 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> >  EXPORT_SYMBOL(drm_gem_handle_delete);
> >
> >  /**
> > - * drm_gem_dumb_map_offset - return the fake mmap offset for a gem object
> > + * drm_gem_map_offset - return the fake mmap offset for a gem object
> >   * @file: drm file-private structure containing the gem object
> >   * @dev: corresponding drm_device
> >   * @handle: gem object handle
> > @@ -307,10 +307,13 @@ EXPORT_SYMBOL(drm_gem_handle_delete);
> >   * This implements the &drm_driver.dumb_map_offset kms driver callback for
> >   * drivers which use gem to manage their backing storage.
> >   *
> > + * It can also be used by drivers using the shmem backend as they have the
> > + * same restriction that imported objects cannot be mapped.
> 
> Maybe better not to say 'shmem' explicitly or just mention it as an
> example so when we have a 2nd case we don't have to update the
> comment.
> 
> ...drivers with GEM BO implementations which have the same...
> 
> I can fix up and apply. Some other acks would be nice first.

Yeah kerneldoc is a bit suboptimal, with that polished, a-b: me. Yours
should be good enough though.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch