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bh=BwwL4cnp4RoALnvWnEcSXWpYWaEMk5cvkZlZMXpw4rk=; b=nDL/EQtmu+kHT0TcVOhTQQziuis/Y1VU5md7oIoYyWv9v677vOod35e3kvmPbPwrIENsmK 2azkcbUz1A9vvbUWnZMVZaQCjnc4vKm2fiYGCgEV+bVfOM0jot/jblMXR3VcyK6IJfKhzY c4JvJKelHDspIkT9C/BBuvRAW5SZp+PDX5EQrTG48HRbfwpl4o8xU9ex3XM64Fn1R1ItIh J9wfZE9ekvY6j3ekrODt0LVCFD5DT0ms4bWmI7b4qNqPmO035pCKzaBu3z2u0FJpLhVC3F 2OWBff7KpGsp7lgDfCMNYitV4QCk0FE+wc4MsvjD8fKdbuqNjwROtSuIqlrwLw== Message-ID: Date: Tue, 15 Apr 2025 14:37:22 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 10/16] drm/vkms: Allow to configure multiple connectors via configfs To: =?UTF-8?B?Sm9zw6kgRXhww7NzaXRv?= Cc: hamohammed.sa@gmail.com, simona@ffwll.ch, melissa.srw@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20250407081425.6420-1-jose.exposito89@gmail.com> <20250407081425.6420-11-jose.exposito89@gmail.com> Content-Language: en-US From: Louis Chauvet Autocrypt: addr=louis.chauvet@bootlin.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgddvvdefheduucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefkffggfgfuvfevfhfhjggtgfesthekredttddvjeenucfhrhhomhepnfhouhhishcuvehhrghuvhgvthcuoehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeekieevtdefgedtkeehteehtddttdefhffhgeejleejjeeluddvhfdugedvkeehveenucffohhmrghinhepsghoohhtlhhinhdrtghomhenucfkphepledtrdekledrudeifedruddvjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeeltddrkeelrdduieefrdduvdejpdhhvghloheplgduledvrdduieekrddtrddvtdgnpdhmrghilhhfrhhomheplhhouhhishdrtghhrghuvhgvthessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepuddtpdhrtghpthhtohepjhhoshgvrdgvgihpohhsihhtohekleesghhmrghilhdrtghomhdprhgtphhtthhopehhrghmohhhrghmmhgvugdrshgrsehgmhgrihhlrdgtohhmpdhrtghpthhtohepshhimhhonhgrsehffhiflhhlrdgthhdprhgtphhtthhopehmvghlihhsshgrrdhsrhifsehgmhgrihhlrdgtohhmpdhrtghpthhtohepm hgrrghrthgvnhdrlhgrnhhkhhhorhhstheslhhinhhugidrihhnthgvlhdrtghomhdprhgtphhtthhopehmrhhiphgrrhgusehkvghrnhgvlhdrohhrghdprhgtphhtthhopehtiihimhhmvghrmhgrnhhnsehsuhhsvgdruggvpdhrtghpthhtoheprghirhhlihgvugesghhmrghilhdrtghomh X-GND-Sasl: louis.chauvet@bootlin.com Le 07/04/2025 à 10:14, José Expósito a écrit : > From: Louis Chauvet > > Create a default subgroup at > /config/vkms/connectors to allow to create as many connectors as > required. Reviewed-by: Louis Chauvet > Signed-off-by: Louis Chauvet > Co-developed-by: José Expósito > Signed-off-by: José Expósito > --- > Documentation/gpu/vkms.rst | 6 ++ > drivers/gpu/drm/vkms/vkms_configfs.c | 87 ++++++++++++++++++++++++++++ > 2 files changed, 93 insertions(+) > > diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst > index 650dbfa76f59..744e2355db23 100644 > --- a/Documentation/gpu/vkms.rst > +++ b/Documentation/gpu/vkms.rst > @@ -74,6 +74,7 @@ By default, the instance is disabled:: > And directories are created for each configurable item of the display pipeline:: > > tree /config/vkms/my-vkms > + ├── connectors > ├── crtcs > ├── enabled > ├── encoders > @@ -103,6 +104,10 @@ Next, create one or more encoders:: > > sudo mkdir /config/vkms/my-vkms/encoders/encoder0 > > +Last but not least, create one or more connectors:: > + > + sudo mkdir /config/vkms/my-vkms/connectors/connector0 > + > To finish the configuration, link the different pipeline items:: > > sudo ln -s /config/vkms/my-vkms/crtcs/crtc0 /config/vkms/my-vkms/planes/plane0/possible_crtcs > @@ -127,6 +132,7 @@ And removing the top level directory and its subdirectories:: > sudo rmdir /config/vkms/my-vkms/planes/* > sudo rmdir /config/vkms/my-vkms/crtcs/* > sudo rmdir /config/vkms/my-vkms/encoders/* > + sudo rmdir /config/vkms/my-vkms/connectors/* > sudo rmdir /config/vkms/my-vkms > > Testing With IGT > diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c > index 7de601e39d2b..692e1b708012 100644 > --- a/drivers/gpu/drm/vkms/vkms_configfs.c > +++ b/drivers/gpu/drm/vkms/vkms_configfs.c > @@ -19,6 +19,7 @@ static bool is_configfs_registered; > * @planes_group: Default subgroup of @group at "/config/vkms/planes" > * @crtcs_group: Default subgroup of @group at "/config/vkms/crtcs" > * @encoders_group: Default subgroup of @group at "/config/vkms/encoders" > + * @connectors_group: Default subgroup of @group at "/config/vkms/connectors" > * @lock: Lock used to project concurrent access to the configuration attributes > * @config: Protected by @lock. Configuration of the VKMS device > * @enabled: Protected by @lock. The device is created or destroyed when this > @@ -29,6 +30,7 @@ struct vkms_configfs_device { > struct config_group planes_group; > struct config_group crtcs_group; > struct config_group encoders_group; > + struct config_group connectors_group; > > struct mutex lock; > struct vkms_config *config; > @@ -81,6 +83,20 @@ struct vkms_configfs_encoder { > struct vkms_config_encoder *config; > }; > > +/** > + * struct vkms_configfs_connector - Configfs representation of a connector > + * > + * @group: Top level configuration group that represents a connector. > + * Initialized when a new directory is created under "/config/vkms/connectors" > + * @dev: The vkms_configfs_device this connector belongs to > + * @config: Configuration of the VKMS connector > + */ > +struct vkms_configfs_connector { > + struct config_group group; > + struct vkms_configfs_device *dev; > + struct vkms_config_connector *config; > +}; > + > #define device_item_to_vkms_configfs_device(item) \ > container_of(to_config_group((item)), struct vkms_configfs_device, \ > group) > @@ -106,6 +122,10 @@ struct vkms_configfs_encoder { > container_of(to_config_group((item)), struct vkms_configfs_encoder, \ > possible_crtcs_group) > > +#define connector_item_to_vkms_configfs_connector(item) \ > + container_of(to_config_group((item)), struct vkms_configfs_connector, \ > + group) > + > static ssize_t crtc_writeback_show(struct config_item *item, char *page) > { > struct vkms_configfs_crtc *crtc; > @@ -485,6 +505,69 @@ static const struct config_item_type encoder_group_type = { > .ct_owner = THIS_MODULE, > }; > > +static void connector_release(struct config_item *item) > +{ > + struct vkms_configfs_connector *connector; > + struct mutex *lock; > + > + connector = connector_item_to_vkms_configfs_connector(item); > + lock = &connector->dev->lock; > + > + scoped_guard(mutex, lock) { > + vkms_config_destroy_connector(connector->config); > + kfree(connector); > + } > +} > + > +static struct configfs_item_operations connector_item_operations = { > + .release = &connector_release, > +}; > + > +static const struct config_item_type connector_item_type = { > + .ct_item_ops = &connector_item_operations, > + .ct_owner = THIS_MODULE, > +}; > + > +static struct config_group *make_connector_group(struct config_group *group, > + const char *name) > +{ > + struct vkms_configfs_device *dev; > + struct vkms_configfs_connector *connector; > + > + dev = child_group_to_vkms_configfs_device(group); > + > + scoped_guard(mutex, &dev->lock) { > + if (dev->enabled) > + return ERR_PTR(-EBUSY); > + > + connector = kzalloc(sizeof(*connector), GFP_KERNEL); > + if (!connector) > + return ERR_PTR(-ENOMEM); > + > + connector->dev = dev; > + > + connector->config = vkms_config_create_connector(dev->config); > + if (IS_ERR(connector->config)) { > + kfree(connector); > + return ERR_CAST(connector->config); > + } > + > + config_group_init_type_name(&connector->group, name, > + &connector_item_type); > + } > + > + return &connector->group; > +} > + > +static struct configfs_group_operations connectors_group_operations = { > + .make_group = &make_connector_group, > +}; > + > +static const struct config_item_type connector_group_type = { > + .ct_group_ops = &connectors_group_operations, > + .ct_owner = THIS_MODULE, > +}; > + > static ssize_t device_enabled_show(struct config_item *item, char *page) > { > struct vkms_configfs_device *dev; > @@ -592,6 +675,10 @@ static struct config_group *make_device_group(struct config_group *group, > &encoder_group_type); > configfs_add_default_group(&dev->encoders_group, &dev->group); > > + config_group_init_type_name(&dev->connectors_group, "connectors", > + &connector_group_type); > + configfs_add_default_group(&dev->connectors_group, &dev->group); > + > return &dev->group; > } > -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com