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Message-ID: <20250225175936.7223-11-jose.exposito89@gmail.com>
Date: Tue, 25 Feb 2025 18:59:30 +0100
From: José Expósito <jose.exposito89@...il.com>
To: louis.chauvet@...tlin.com
Cc: hamohammed.sa@...il.com,
simona@...ll.ch,
melissa.srw@...il.com,
maarten.lankhorst@...ux.intel.com,
mripard@...nel.org,
tzimmermann@...e.de,
airlied@...il.com,
dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org,
José Expósito <jose.exposito89@...il.com>
Subject: [PATCH v2 10/16] drm/vkms: Allow to configure multiple connectors via configfs
Create a default subgroup at
/config/vkms/connectors to allow to create as many connectors as
required.
Co-developed-by: Louis Chauvet <louis.chauvet@...tlin.com>
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
Signed-off-by: José Expósito <jose.exposito89@...il.com>
---
Documentation/gpu/vkms.rst | 6 ++
drivers/gpu/drm/vkms/vkms_configfs.c | 86 ++++++++++++++++++++++++++++
2 files changed, 92 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 64aa10cd3156..bcbf91fbcd44 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;
@@ -469,6 +489,68 @@ 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;
+
+ 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);
+
+ 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;
@@ -573,6 +655,10 @@ 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;
}
--
2.48.1
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