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Mon, 27 Oct 2025 08:01:02 -0700 (PDT) Date: Mon, 27 Oct 2025 16:01:00 +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 Subject: Re: [PATCH 21/22] drm/vkms: Allow to hot-add connectors Message-ID: References: <20251018-vkms-all-config-v1-0-a7760755d92d@bootlin.com> <20251018-vkms-all-config-v1-21-a7760755d92d@bootlin.com> Precedence: bulk X-Mailing-List: linux-doc@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: <20251018-vkms-all-config-v1-21-a7760755d92d@bootlin.com> On Sat, Oct 18, 2025 at 04:01:21AM +0200, Louis Chauvet wrote: > In order to allow creating dynamic connector, add the required > infrastructure in vkms_connector. > > Co-developed-by: José Expósito > Signed-off-by: José Expósito > [Louis Chauvet: use drm_atomic_helper_connector_reset instead of > drm_mode_config_reset because connector is not yet registered] Aha! That was why, thanks a lot for figuring this out :) > Signed-off-by: Louis Chauvet > --- > drivers/gpu/drm/vkms/vkms_connector.c | 69 ++++++++++++++++++++++++++++++++++- > drivers/gpu/drm/vkms/vkms_connector.h | 33 +++++++++++++++++ > drivers/gpu/drm/vkms/vkms_output.c | 11 +++++- > 3 files changed, 111 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/vkms/vkms_connector.c b/drivers/gpu/drm/vkms/vkms_connector.c > index 339d747e729e..77a544728721 100644 > --- a/drivers/gpu/drm/vkms/vkms_connector.c > +++ b/drivers/gpu/drm/vkms/vkms_connector.c > @@ -1,5 +1,4 @@ > // SPDX-License-Identifier: GPL-2.0+ > - > #include > #include > #include > @@ -144,9 +143,77 @@ struct vkms_connector *vkms_connector_init(struct vkms_device *vkmsdev, > return 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 = drm_connector_cleanup, > + .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 = kzalloc(sizeof(*connector), GFP_KERNEL); Could we use drmm_kzalloc instead? > + if (IS_ERR(connector)) > + 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); > + > + 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 a124c5403697..224950c13a93 100644 > --- a/drivers/gpu/drm/vkms/vkms_connector.h > +++ b/drivers/gpu/drm/vkms/vkms_connector.h > @@ -7,6 +7,7 @@ > > #define drm_connector_to_vkms_connector(target) \ > container_of(target, struct vkms_connector, base) > +struct vkms_config_connector; > > /** > * struct vkms_connector - VKMS custom type wrapping around the DRM connector > @@ -33,4 +34,36 @@ struct vkms_connector *vkms_connector_init(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: > + * The connector or an error 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 > + * @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 217f054d9598..aba2f9ab243d 100644 > --- a/drivers/gpu/drm/vkms/vkms_output.c > +++ b/drivers/gpu/drm/vkms/vkms_output.c > @@ -92,7 +92,7 @@ int vkms_output_init(struct vkms_device *vkmsdev) > } > } > > - vkms_config_for_each_connector(vkmsdev->config, connector_cfg) { > + vkms_config_for_each_connector_static(vkmsdev->config, connector_cfg) { > struct vkms_config_encoder *possible_encoder; > unsigned long idx = 0; > > @@ -116,5 +116,14 @@ 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; > } > > -- > 2.51.0 >