Le 28/08/24 - 11:35, Jani Nikula a écrit :
> On Tue, 27 Aug 2024, Louis Chauvet <louis.chauvet@xxxxxxxxxxx> wrote:
> > Le 27/08/24 - 16:33, Maxime Ripard a écrit :
> >> Hi,
> >>
> >> On Wed, Aug 14, 2024 at 04:36:33PM GMT, Louis Chauvet wrote:
> >> > Currently drm_writeback_connector are created by
> >> > drm_writeback_connector_init or drm_writeback_connector_init_with_encoder.
> >> > Both of the function uses drm_connector_init and drm_encoder_init, but
> >> > there is no way to properly clean those structure from outside.
> >> >
> >> > This patch introduce the new function drm_writeback_connector_cleanup to
> >> > allow a proper cleanup.
> >> >
> >> > Signed-off-by: Louis Chauvet <louis.chauvet@xxxxxxxxxxx>
> >> > ---
> >> > drivers/gpu/drm/drm_writeback.c | 10 ++++++++++
> >> > include/drm/drm_writeback.h | 11 +++++++++++
> >> > 2 files changed, 21 insertions(+)
> >> >
> >> > diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c
> >> > index a031c335bdb9..505a4eb40f93 100644
> >> > --- a/drivers/gpu/drm/drm_writeback.c
> >> > +++ b/drivers/gpu/drm/drm_writeback.c
> >> > @@ -184,6 +184,7 @@ int drm_writeback_connector_init(struct drm_device *dev,
> >> > drm_encoder_helper_add(&wb_connector->encoder, enc_helper_funcs);
> >> >
> >> > wb_connector->encoder.possible_crtcs = possible_crtcs;
> >> > + wb_connector->managed_encoder = true;
> >> >
> >> > ret = drm_encoder_init(dev, &wb_connector->encoder,
> >> > &drm_writeback_encoder_funcs,
> >> > @@ -290,6 +291,15 @@ int drm_writeback_connector_init_with_encoder(struct drm_device *dev,
> >> > }
> >> > EXPORT_SYMBOL(drm_writeback_connector_init_with_encoder);
> >> >
> >> > +void drm_writeback_connector_cleanup(struct drm_writeback_connector *wb_connector)
> >> > +{
> >> > + drm_connector_cleanup(&wb_connector->base);
> >> > + drm_property_blob_put(wb_connector->pixel_formats_blob_ptr);
> >> > + if (wb_connector->managed_encoder)
> >> > + drm_encoder_cleanup(&wb_connector->encoder);
> >> > +}
> >> > +EXPORT_SYMBOL(drm_writeback_connector_cleanup);
> >> > +
> >> > int drm_writeback_set_fb(struct drm_connector_state *conn_state,
> >> > struct drm_framebuffer *fb)
> >> > {
> >> > diff --git a/include/drm/drm_writeback.h b/include/drm/drm_writeback.h
> >> > index 17e576c80169..e651c0c0c84c 100644
> >> > --- a/include/drm/drm_writeback.h
> >> > +++ b/include/drm/drm_writeback.h
> >> > @@ -35,6 +35,15 @@ struct drm_writeback_connector {
> >> > */
> >> > struct drm_encoder encoder;
> >> >
> >> > + /**
> >> > + * @managed_encoder: Sets to true if @encoder was created by drm_writeback_connector_init()
> >> > + *
> >> > + * If the user used drm_writeback_connector_init_with_encoder() to create the connector,
> >> > + * @encoder is not valid and not managed by drm_writeback_connector. This fields allows
> >> > + * the drm_writeback_cleanup() function to properly destroy the encoder if needed.
> >> > + */
> >> > + bool managed_encoder;
> >> > +
> >>
> >> I think we should rather create drmm_writeback_connector variants,
> >> and make both deprecated in favor of these new functions.
> >
> > Hi,
> >
> > I can try to do it. If I understand correctly, you want to create two
> > functions like this?
> >
> > int drmm_writeback_connector_init([...]) {
> > /* drmm and alloc as we want to let drm core to manage this
> > encoder, no need to store it in drm_writeback_connector
> > */
> > enc = drmm_plain_encoder_alloc(...);
> >
> > return drmm_writeback_connector_init_with_encoder([...], enc);
> > }
> >
> > int drmm_writeback_connector_init_with_encoder([...], enc) {
> > con = drmm_connector_init([...]);
> >
> > drm_connector_attach_encoder(enc, con);
> >
> > /* Needed for pixel_formats_blob_ptr, base is already
> > managed by drmm_connector_init. Maybe cleaning
> > job_queue is also needed? */
> > drmm_add_action_or_reset([...], &drm_writeback_connector_cleanup)
> > }
>
> Why add two variants, when you can have one and pass NULL for encoder?
> We have the _init_with_encoder variant only because nobody bothered to
> clean up existing call sites.
I just followed the existing code, but yes, I can make only one function
and create the encoder if the pointer is NULL.
> Side note, I'd still like to be able to pass driver's own allocated
> connector instead of having writeback midlayer force it on you.
I just checked, it seems non-trivial to make this change and I don't feel
confident to change this much the drm core.
Louis Chauvet
> BR,
> Jani.
>
>
> >
> > Louis Chauvet
> >
> >> Maxime
> >
> >
>
> --
> Jani Nikula, Intel
