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Message-Id: <20240814-google-config-fs-v1-3-8363181907a6@bootlin.com>
Date: Wed, 14 Aug 2024 17:15:50 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
Melissa Wen <melissa.srw@...il.com>,
Maíra Canal <mairacanal@...eup.net>,
Haneen Mohammed <hamohammed.sa@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>
Cc: dri-devel@...ts.freedesktop.org, arthurgrillo@...eup.net,
linux-kernel@...r.kernel.org, jeremie.dautheribes@...tlin.com,
miquel.raynal@...tlin.com, thomas.petazzoni@...tlin.com,
seanpaul@...gle.com, nicolejadeyee@...gle.com,
Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH RFC 3/7] drm/vkms: Introduce basic plane creation
To allows the userspace to test many hardware configuration, introduce a
new interface to create and configure planes.
The planes are created by creating a directory in the `planes` directory.
The type of plane is configured by writing 0 (Overlay), 1 (primary) or 2
(cursor) in the file `type`.
As the CRTCs and encoders can't be configured yet, the planes are all
atteched to the same CRTC and encoder.
The current interface is:
/config/vkms
DEVICE_1
┣━ enable
┣━ planes
┃ ┣━ PLANE_1
┃ ┃ ┣━ type
┃ ┣━ PLANE_2
┃ ┃ ┗━ type
┃ ┗━ PLANE_3
┃ ┗━ type
DEVICE_2
┗━ ditto
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
drivers/gpu/drm/vkms/vkms_configfs.c | 149 ++++++++++++++++++++++++++++++++---
drivers/gpu/drm/vkms/vkms_configfs.h | 20 +++++
2 files changed, 160 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c
index 6535672f0084..ee64243396b3 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.c
+++ b/drivers/gpu/drm/vkms/vkms_configfs.c
@@ -10,6 +10,138 @@
#include "vkms_drv.h"
#include "vkms_config.h"
+static ssize_t plane_type_show(struct config_item *item, char *page)
+{
+ struct vkms_config_plane *plane;
+ enum drm_plane_type plane_type;
+ struct vkms_configfs_device *vkms_configfs = plane_item_to_vkms_configfs_device(item);
+
+ mutex_lock(&vkms_configfs->lock);
+ plane = plane_item_to_vkms_configfs_plane(item)->vkms_config_plane;
+ plane_type = plane->type;
+ mutex_unlock(&vkms_configfs->lock);
+
+ return sprintf(page, "%u", plane_type);
+}
+
+static ssize_t plane_type_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct vkms_configfs_device *vkms_configfs = plane_item_to_vkms_configfs_device(item);
+ enum drm_plane_type val = DRM_PLANE_TYPE_OVERLAY;
+ struct vkms_config_plane *plane;
+ int ret;
+
+ ret = kstrtouint(page, 10, &val);
+ if (ret)
+ return ret;
+
+ if (val != DRM_PLANE_TYPE_PRIMARY && val != DRM_PLANE_TYPE_CURSOR &&
+ val != DRM_PLANE_TYPE_OVERLAY)
+ return -EINVAL;
+
+ mutex_lock(&vkms_configfs->lock);
+ if (vkms_configfs->enabled) {
+ mutex_unlock(&vkms_configfs->lock);
+ return -EINVAL;
+ }
+
+ plane = plane_item_to_vkms_configfs_plane(item)->vkms_config_plane;
+ plane->type = val;
+
+ mutex_unlock(&vkms_configfs->lock);
+
+ return count;
+}
+
+CONFIGFS_ATTR(plane_, type);
+
+static struct configfs_attribute *plane_attrs[] = {
+ &plane_attr_type,
+ NULL,
+};
+
+static void plane_release(struct config_item *item)
+{
+ struct vkms_configfs_plane *vkms_configfs_plane = plane_item_to_vkms_configfs_plane(item);
+
+ mutex_lock(&vkms_configfs_plane->vkms_configfs_device->lock);
+ vkms_config_delete_plane(vkms_configfs_plane->vkms_config_plane,
+ vkms_configfs_plane->vkms_configfs_device->vkms_config);
+ mutex_unlock(&vkms_configfs_plane->vkms_configfs_device->lock);
+
+ kfree(vkms_configfs_plane);
+}
+
+static struct configfs_item_operations plane_item_operations = {
+ .release = plane_release,
+};
+
+static const struct config_item_type subgroup_plane = {
+ .ct_attrs = plane_attrs,
+ .ct_item_ops = &plane_item_operations,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_group *planes_make_group(struct config_group *config_group,
+ const char *name)
+{
+ struct vkms_configfs_device *vkms_configfs;
+ struct vkms_configfs_plane *vkms_configfs_plane;
+
+ vkms_configfs = planes_item_to_vkms_configfs_device(&config_group->cg_item);
+ vkms_configfs_plane = kzalloc(sizeof(*vkms_configfs_plane), GFP_KERNEL);
+
+ if (!vkms_configfs_plane)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_lock(&vkms_configfs->lock);
+
+ if (vkms_configfs->enabled) {
+ kfree(vkms_configfs_plane);
+ mutex_unlock(&vkms_configfs->lock);
+ return ERR_PTR(-EINVAL);
+ }
+
+ vkms_configfs_plane->vkms_config_plane = vkms_config_create_plane(vkms_configfs->vkms_config);
+
+ if (list_count_nodes(&vkms_configfs->vkms_config->planes) == 1)
+ vkms_configfs_plane->vkms_config_plane->type = DRM_PLANE_TYPE_PRIMARY;
+
+ if (!vkms_configfs_plane->vkms_config_plane ||
+ vkms_config_plane_attach_crtc(vkms_configfs_plane->vkms_config_plane,
+ vkms_configfs->vkms_config_crtc)) {
+ kfree(vkms_configfs_plane);
+ mutex_unlock(&vkms_configfs->lock);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ vkms_configfs_plane->vkms_config_plane->name = kzalloc(strlen(name) + 1, GFP_KERNEL);
+ if (!vkms_configfs_plane->vkms_config_plane->name) {
+ kfree(vkms_configfs_plane->vkms_config_plane);
+ kfree(vkms_configfs_plane);
+ mutex_unlock(&vkms_configfs->lock);
+ return ERR_PTR(-ENOMEM);
+ }
+ strscpy(vkms_configfs_plane->vkms_config_plane->name, name, strlen(name) + 1);
+
+ config_group_init_type_name(&vkms_configfs_plane->group, name, &subgroup_plane);
+
+ vkms_configfs_plane->vkms_configfs_device = vkms_configfs;
+ mutex_unlock(&vkms_configfs->lock);
+
+ return &vkms_configfs_plane->group;
+}
+
+static struct configfs_group_operations planes_group_operations = {
+ .make_group = &planes_make_group,
+};
+
+static const struct config_item_type planes_item_type = {
+ .ct_group_ops = &planes_group_operations,
+ .ct_owner = THIS_MODULE,
+};
+
static ssize_t device_enable_show(struct config_item *item, char *page)
{
return sprintf(page, "%d\n",
@@ -92,23 +224,22 @@ static struct config_group *root_make_group(struct config_group *group,
return ERR_PTR(-ENOMEM);
}
- plane = vkms_config_create_plane(configfs->vkms_config);
- crtc = vkms_config_create_crtc(configfs->vkms_config);
- encoder = vkms_config_create_encoder(configfs->vkms_config);
-
- if (!plane || !crtc || !encoder ||
- vkms_config_plane_attach_crtc(plane, crtc) ||
- vkms_config_encoder_attach_crtc(encoder, crtc)) {
+ configfs->vkms_config_crtc = vkms_config_create_crtc(configfs->vkms_config);
+ configfs->vkms_config_encoder = vkms_config_create_encoder(configfs->vkms_config);
+ if (!configfs->vkms_config_crtc || !configfs->vkms_config_encoder ||
+ vkms_config_encoder_attach_crtc(configfs->vkms_config_encoder,
+ configfs->vkms_config_crtc)) {
vkms_config_destroy(configfs->vkms_config);
kfree(configfs);
return ERR_PTR(-ENOMEM);
}
- plane->type = DRM_PLANE_TYPE_PRIMARY;
-
config_group_init_type_name(&configfs->group, name,
&device_item_type);
+ config_group_init_type_name(&configfs->plane_group, "planes", &planes_item_type);
+ configfs_add_default_group(&configfs->plane_group, &configfs->group);
+
return &configfs->group;
}
diff --git a/drivers/gpu/drm/vkms/vkms_configfs.h b/drivers/gpu/drm/vkms/vkms_configfs.h
index 3de89c9c552c..6dc4d34a9e44 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.h
+++ b/drivers/gpu/drm/vkms/vkms_configfs.h
@@ -19,15 +19,35 @@
struct vkms_configfs_device {
struct config_group group;
+ struct config_group plane_group;
+
struct mutex lock;
bool enabled;
struct vkms_config *vkms_config;
+ struct vkms_config_crtc *vkms_config_crtc;
+ struct vkms_config_encoder *vkms_config_encoder;
+};
+
+struct vkms_configfs_plane {
+ struct config_group group;
+
+ struct vkms_configfs_device *vkms_configfs_device;
+ struct vkms_config_plane *vkms_config_plane;
};
#define config_item_to_vkms_configfs_device(item) \
container_of(to_config_group((item)), struct vkms_configfs_device, group)
+#define planes_item_to_vkms_configfs_device(item) \
+ config_item_to_vkms_configfs_device((item)->ci_parent)
+
+#define plane_item_to_vkms_configfs_device(item) \
+ planes_item_to_vkms_configfs_device((item)->ci_parent)
+
+#define plane_item_to_vkms_configfs_plane(item) \
+ container_of(to_config_group((item)), struct vkms_configfs_plane, group)
+
/* ConfigFS Support */
int vkms_init_configfs(void);
void vkms_unregister_configfs(void);
--
2.44.2
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