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Mon, 29 Dec 2025 09:09:37 -0800 (PST) Date: Mon, 29 Dec 2025 18:09:35 +0100 From: =?iso-8859-1?Q?Jos=E9_Exp=F3sito?= To: Louis Chauvet Cc: Haneen Mohammed , Simona Vetter , Melissa Wen , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Jonathan Corbet , victoria@system76.com, sebastian.wick@redhat.com, thomas.petazzoni@bootlin.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Luca Ceresoli Subject: Re: [PATCH v3 32/33] drm/vkms: Allow to hot-add connectors Message-ID: References: <20251222-vkms-all-config-v3-0-ba42dc3fb9ff@bootlin.com> <20251222-vkms-all-config-v3-32-ba42dc3fb9ff@bootlin.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20251222-vkms-all-config-v3-32-ba42dc3fb9ff@bootlin.com> On Mon, Dec 22, 2025 at 11:11:34AM +0100, Louis Chauvet wrote: > In order to allow creating dynamic connector, add the required > infrastructure in vkms_connector. > > [Louis Chauvet: use drm_atomic_helper_connector_reset instead of > drm_mode_config_reset because connector is not yet registered] > > Co-developed-by: José Expósito > Signed-off-by: José Expósito > Reviewed-by: Luca Ceresoli > Signed-off-by: Louis Chauvet > --- > drivers/gpu/drm/vkms/vkms_connector.c | 81 +++++++++++++++++++++++++++++++++++ > drivers/gpu/drm/vkms/vkms_connector.h | 33 ++++++++++++++ > drivers/gpu/drm/vkms/vkms_output.c | 9 ++++ > 3 files changed, 123 insertions(+) > > diff --git a/drivers/gpu/drm/vkms/vkms_connector.c b/drivers/gpu/drm/vkms/vkms_connector.c > index 3ad614642355..616036494937 100644 > --- a/drivers/gpu/drm/vkms/vkms_connector.c > +++ b/drivers/gpu/drm/vkms/vkms_connector.c > @@ -163,9 +163,90 @@ struct vkms_connector *vkms_connector_init_static(struct vkms_device *vkmsdev, > return connector; > } > > +static void vkms_connector_dynamic_destroy(struct drm_connector *connector) > +{ > + struct drm_device *dev = connector->dev; > + struct vkms_connector *vkms_connector; > + > + drm_connector_cleanup(connector); > + > + vkms_connector = drm_connector_to_vkms_connector(connector); > + drmm_kfree(dev, vkms_connector); > +} > + > +static const struct drm_connector_funcs vkms_dynamic_connector_funcs = { > + .fill_modes = drm_helper_probe_single_connector_modes, > + .reset = drm_atomic_helper_connector_reset, > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > + .destroy = vkms_connector_dynamic_destroy, > + .detect = vkms_connector_detect, > +}; > + > void vkms_trigger_connector_hotplug(struct vkms_device *vkmsdev) > { > struct drm_device *dev = &vkmsdev->drm; > > drm_kms_helper_hotplug_event(dev); > } > + > +struct vkms_connector *vkms_connector_hot_add(struct vkms_device *vkmsdev, > + struct vkms_config_connector *connector_cfg) > +{ > + struct vkms_config_encoder *encoder_cfg; > + struct vkms_connector *connector; > + int ret; > + unsigned long idx = 0; > + > + connector = drmm_kzalloc(&vkmsdev->drm, sizeof(*connector), GFP_KERNEL); > + if (IS_ERR(connector)) I need to test this patch carefully, but in a first review I noticed that this "if" should check for NULL, not for error. Jose > + return connector; > + ret = drm_connector_dynamic_init(&vkmsdev->drm, > + &connector->base, > + &vkms_dynamic_connector_funcs, > + connector_cfg->type, > + NULL); > + if (ret) > + return ERR_PTR(ret); > + drm_connector_helper_add(&connector->base, &vkms_conn_helper_funcs); > + > + vkms_config_connector_for_each_possible_encoder(connector_cfg, idx, encoder_cfg) { > + ret = drm_connector_attach_encoder(&connector->base, > + encoder_cfg->encoder); > + if (ret) > + return ERR_PTR(ret); > + } > + > + drm_atomic_helper_connector_reset(&connector->base); > + > + vkms_connector_init(vkmsdev, connector, connector_cfg); > + > + ret = drm_connector_dynamic_register(&connector->base); > + if (ret) > + return ERR_PTR(ret); > + > + return connector; > +} > + > +void vkms_connector_hot_remove(struct vkms_device *vkmsdev, > + struct vkms_connector *connector) > +{ > + drm_connector_unregister(&connector->base); > + drm_mode_config_reset(&vkmsdev->drm); > + drm_connector_put(&connector->base); > +} > + > +int vkms_connector_hot_attach_encoder(struct vkms_device *vkmsdev, > + struct vkms_connector *connector, > + struct drm_encoder *encoder) > +{ > + int ret; > + > + ret = drm_connector_attach_encoder(&connector->base, encoder); > + if (ret) > + return ret; > + > + drm_mode_config_reset(&vkmsdev->drm); > + > + return ret; > +} > diff --git a/drivers/gpu/drm/vkms/vkms_connector.h b/drivers/gpu/drm/vkms/vkms_connector.h > index 85f9082c710e..a235a518d5a0 100644 > --- a/drivers/gpu/drm/vkms/vkms_connector.h > +++ b/drivers/gpu/drm/vkms/vkms_connector.h > @@ -34,4 +34,37 @@ struct vkms_connector *vkms_connector_init_static(struct vkms_device *vkmsdev, > */ > void vkms_trigger_connector_hotplug(struct vkms_device *vkmsdev); > > +/** > + * vkms_connector_hot_add() - Create a connector after the device is created > + * @vkmsdev: Device to hot-add the connector to > + * @connector_cfg: Connector's configuration > + * > + * Returns: > + * A pointer to the newly created connector or a PTR_ERR on failure. > + */ > +struct vkms_connector *vkms_connector_hot_add(struct vkms_device *vkmsdev, > + struct vkms_config_connector *connector_cfg); > + > +/** > + * vkms_connector_hot_remove() - Remove a connector after a device is created > + * @vkmsdev: Device to containing the connector to be removed > + * @connector: The connector to hot-remove > + */ > +void vkms_connector_hot_remove(struct vkms_device *vkmsdev, > + struct vkms_connector *connector); > + > +/** > + * vkms_connector_hot_attach_encoder() - Attach a connector to a encoder after > + * the device is created. > + * @vkmsdev: Device containing the connector and the encoder > + * @connector: Connector to attach to @encoder > + * @encoder: Target encoder > + * > + * Returns: > + * 0 on success or an error on failure. > + */ > +int vkms_connector_hot_attach_encoder(struct vkms_device *vkmsdev, > + struct vkms_connector *connector, > + struct drm_encoder *encoder); > + > #endif /* _VKMS_CONNECTOR_H_ */ > diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c > index 13c4ca5fd39d..50f7d88dee8b 100644 > --- a/drivers/gpu/drm/vkms/vkms_output.c > +++ b/drivers/gpu/drm/vkms/vkms_output.c > @@ -117,5 +117,14 @@ int vkms_output_init(struct vkms_device *vkmsdev) > > drm_mode_config_reset(dev); > > + vkms_config_for_each_connector_dynamic(vkmsdev->config, connector_cfg) { > + if (connector_cfg->enabled) { > + connector_cfg->connector = vkms_connector_hot_add(vkmsdev, connector_cfg); > + > + if (IS_ERR(connector_cfg->connector)) > + return PTR_ERR(connector_cfg->connector); > + } > + } > + > return 0; > } > > -- > 2.51.2 >