Re: [RFC PATCH v2 03/13] drm/msm/dpu: encoder: simplify debugfs handling

From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc: Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
	Stephen Boyd <swboyd@chromium.org>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	Bjorn Andersson <andersson@kernel.org>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	freedreno@lists.freedesktop.org
Subject: Re: [RFC PATCH v2 03/13] drm/msm/dpu: encoder: simplify debugfs handling
Date: Sun, 14 May 2023 20:02:37 +0300	[thread overview]
Message-ID: <CAA8EJprczWqZ9uDPujw0JbOVW6A5+NcF_isnzDmheomRg3MQjw@mail.gmail.com> (raw)
In-Reply-To: <47ade353-a46a-9f10-f712-4d5502e03ce1@quicinc.com>

On Sat, 13 May 2023 at 01:18, Abhinav Kumar <quic_abhinavk@quicinc.com> wrote:
>
>
>
> On 3/20/2023 6:18 PM, Dmitry Baryshkov wrote:
> > As the debugfs is fully cleared on drm device removal, drop the
> > encoder-specific cleanup function, remove debugfs_root from dpu_encoder
> > struct and also remove phys_encoder late_register() ops which has been
> > unused since the driver being added.
> >
>
> Agreed, late_register of encoder_phys is unused, so we can drop that.
>
> For the other two things which this patch does:
>
> 1) remove debugfs_root from dpu_encoder
> 2) remove early_unregister of dpu_encoder
>
> I think this has been posted separately here
> https://patchwork.freedesktop.org/patch/534802/?series=117150&rev=1 for
> which I had given my feedback about why it cant be removed

Sure. And this patch predates your feedback.

>
> So these 2 parts have to be kept till we sort out that feedback
>
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> > ---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c   | 22 +++----------------
> >   .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h  |  3 ---
> >   2 files changed, 3 insertions(+), 22 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > index 97d8d777f178..28729c77364f 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > @@ -142,7 +142,6 @@ enum dpu_enc_rc_states {
> >    * @crtc_kickoff_cb:                Callback into CRTC that will flush & start
> >    *                          all CTL paths
> >    * @crtc_kickoff_cb_data:   Opaque user data given to crtc_kickoff_cb
> > - * @debugfs_root:            Debug file system root file node
> >    * @enc_lock:                       Lock around physical encoder
> >    *                          create/destroy/enable/disable
> >    * @frame_busy_mask:                Bitmask tracking which phys_enc we are still
> > @@ -186,7 +185,6 @@ struct dpu_encoder_virt {
> >       struct drm_crtc *crtc;
> >       struct drm_connector *connector;
> >
> > -     struct dentry *debugfs_root;
> >       struct mutex enc_lock;
> >       DECLARE_BITMAP(frame_busy_mask, MAX_PHYS_ENCODERS_PER_VIRTUAL);
> >       void (*crtc_frame_event_cb)(void *, u32 event);
> > @@ -2134,7 +2132,7 @@ DEFINE_SHOW_ATTRIBUTE(_dpu_encoder_status);
> >   static int _dpu_encoder_init_debugfs(struct drm_encoder *drm_enc)
> >   {
> >       struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> > -     int i;
> > +     struct dentry *debugfs_root;
> >
> >       char name[DPU_NAME_SIZE];
> >
> > @@ -2146,18 +2144,12 @@ static int _dpu_encoder_init_debugfs(struct drm_encoder *drm_enc)
> >       snprintf(name, DPU_NAME_SIZE, "encoder%u", drm_enc->base.id);
> >
> >       /* create overall sub-directory for the encoder */
> > -     dpu_enc->debugfs_root = debugfs_create_dir(name,
> > +     debugfs_root = debugfs_create_dir(name,
> >                       drm_enc->dev->primary->debugfs_root);
> >
> >       /* don't error check these */
> >       debugfs_create_file("status", 0600,
> > -             dpu_enc->debugfs_root, dpu_enc, &_dpu_encoder_status_fops);
> > -
> > -     for (i = 0; i < dpu_enc->num_phys_encs; i++)
> > -             if (dpu_enc->phys_encs[i]->ops.late_register)
> > -                     dpu_enc->phys_encs[i]->ops.late_register(
> > -                                     dpu_enc->phys_encs[i],
> > -                                     dpu_enc->debugfs_root);
> > +             debugfs_root, dpu_enc, &_dpu_encoder_status_fops);
> >
> >       return 0;
> >   }
> > @@ -2173,13 +2165,6 @@ static int dpu_encoder_late_register(struct drm_encoder *encoder)
> >       return _dpu_encoder_init_debugfs(encoder);
> >   }
> >
> > -static void dpu_encoder_early_unregister(struct drm_encoder *encoder)
> > -{
> > -     struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(encoder);
> > -
> > -     debugfs_remove_recursive(dpu_enc->debugfs_root);
> > -}
> > -
> >   static int dpu_encoder_virt_add_phys_encs(
> >               struct msm_display_info *disp_info,
> >               struct dpu_encoder_virt *dpu_enc,
> > @@ -2406,7 +2391,6 @@ static const struct drm_encoder_helper_funcs dpu_encoder_helper_funcs = {
> >   static const struct drm_encoder_funcs dpu_encoder_funcs = {
> >               .destroy = dpu_encoder_destroy,
> >               .late_register = dpu_encoder_late_register,
> > -             .early_unregister = dpu_encoder_early_unregister,
> >   };
> >
> >   int dpu_encoder_setup(struct drm_device *dev, struct drm_encoder *enc,
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> > index 1d434b22180d..9e29079a6fc4 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> > @@ -63,7 +63,6 @@ struct dpu_encoder_phys;
> >   /**
> >    * struct dpu_encoder_phys_ops - Interface the physical encoders provide to
> >    *  the containing virtual encoder.
> > - * @late_register:           DRM Call. Add Userspace interfaces, debugfs.
> >    * @prepare_commit:         MSM Atomic Call, start of atomic commit sequence
> >    * @is_master:                      Whether this phys_enc is the current master
> >    *                          encoder. Can be switched at enable time. Based
> > @@ -93,8 +92,6 @@ struct dpu_encoder_phys;
> >    */
> >
> >   struct dpu_encoder_phys_ops {
> > -     int (*late_register)(struct dpu_encoder_phys *encoder,
> > -                     struct dentry *debugfs_root);
> >       void (*prepare_commit)(struct dpu_encoder_phys *encoder);
> >       bool (*is_master)(struct dpu_encoder_phys *encoder);
> >       void (*atomic_mode_set)(struct dpu_encoder_phys *encoder,

-- 
With best wishes
Dmitry