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Message-Id: <20251018-vkms-all-config-v1-6-a7760755d92d@bootlin.com>
Date: Sat, 18 Oct 2025 04:01:06 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Haneen Mohammed <hamohammed.sa@...il.com>,
Simona Vetter <simona@...ll.ch>, Melissa Wen <melissa.srw@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, jose.exposito89@...il.com,
Jonathan Corbet <corbet@....net>
Cc: victoria@...tem76.com, sebastian.wick@...hat.com, victoria@...tem76.com,
airlied@...il.com, thomas.petazzoni@...tlin.com,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH 06/22] drm/vkms: Introduce configfs for plane color
encoding
To allows the userspace to test many hardware configuration, introduce a
new interface to configure the available color encoding per planes. VKMS
supports multiple color encoding, so the userspace can choose any
combination.
The supported color encoding are configured by writing a color encoding
bitmask to the file `supported_color_encoding` and the default color
encoding is chosen by writing a color encoding bitmask to
`default_color_encoding`.
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
Documentation/gpu/vkms.rst | 7 ++-
drivers/gpu/drm/vkms/vkms_configfs.c | 102 +++++++++++++++++++++++++++++++++++
2 files changed, 108 insertions(+), 1 deletion(-)
diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
index a432968cc711..4ff75b53a386 100644
--- a/Documentation/gpu/vkms.rst
+++ b/Documentation/gpu/vkms.rst
@@ -87,7 +87,7 @@ Start by creating one or more planes::
sudo mkdir /config/vkms/my-vkms/planes/plane0
-Planes have 3 configurable attribute:
+Planes have 5 configurable attribute:
- type: Plane type: 0 overlay, 1 primary, 2 cursor (same values as those
exposed by the "type" property of a plane)
@@ -96,6 +96,11 @@ Planes have 3 configurable attribute:
(same values as those exposed by the "rotation" property of a plane)
- default_rotation: Default rotation presented to the userspace, same values as
possible_rotations.
+- supported_color_encoding: Available encoding for a plane, as a bitmask:
+ 0x01 YCBCR_BT601, 0x02: YCBCR_BT709, 0x04 YCBCR_BT2020 (same values as those exposed
+ by the COLOR_ENCODING property of a plane)
+- default_color_encoding: Default color encoding presented to the userspace, same
+ values as supported_color_encoding
Continue by creating one or more CRTCs::
diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c
index 450e45e66a45..a4e0e054cf2d 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.c
+++ b/drivers/gpu/drm/vkms/vkms_configfs.c
@@ -412,14 +412,116 @@ static ssize_t plane_default_rotation_store(struct config_item *item,
return count;
}
+static ssize_t plane_supported_color_encoding_show(struct config_item *item, char *page)
+{
+ struct vkms_configfs_plane *plane;
+ unsigned int supported_color_encoding;
+
+ plane = plane_item_to_vkms_configfs_plane(item);
+
+ scoped_guard(mutex, &plane->dev->lock) {
+ supported_color_encoding = vkms_config_plane_get_supported_color_encoding(plane->config);
+ }
+
+ return sprintf(page, "%u", supported_color_encoding);
+}
+
+static ssize_t plane_supported_color_encoding_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct vkms_configfs_plane *plane = plane_item_to_vkms_configfs_plane(item);
+ int ret, val = 0;
+
+ ret = kstrtouint(page, 10, &val);
+ if (ret)
+ return ret;
+
+ /* Should be a supported value */
+ if (val & ~(BIT(DRM_COLOR_YCBCR_BT601) |
+ BIT(DRM_COLOR_YCBCR_BT709) |
+ BIT(DRM_COLOR_YCBCR_BT2020)))
+ return -EINVAL;
+ /* Should at least provide one color range */
+ if ((val & (BIT(DRM_COLOR_YCBCR_BT601) |
+ BIT(DRM_COLOR_YCBCR_BT709) |
+ BIT(DRM_COLOR_YCBCR_BT2020))) == 0)
+ return -EINVAL;
+
+ scoped_guard(mutex, &plane->dev->lock) {
+ /* Ensures that the default rotation is included in supported rotation */
+ if (plane->dev->enabled ||
+ (val & vkms_config_plane_get_default_color_encoding(plane->config)) !=
+ vkms_config_plane_get_default_color_encoding(plane->config))
+ return -EINVAL;
+
+ vkms_config_plane_set_supported_color_encoding(plane->config, val);
+ }
+
+ return count;
+}
+
+/* Plane default_color_encoding : vkms/<device>/planes/<plane>/default_color_encoding */
+
+static ssize_t plane_default_color_encoding_show(struct config_item *item, char *page)
+{
+ struct vkms_configfs_plane *plane;
+ unsigned int default_color_encoding;
+
+ plane = plane_item_to_vkms_configfs_plane(item);
+
+ scoped_guard(mutex, &plane->dev->lock) {
+ default_color_encoding = vkms_config_plane_get_default_color_encoding(plane->config);
+ }
+
+ return sprintf(page, "%u", default_color_encoding);
+}
+
+static ssize_t plane_default_color_encoding_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct vkms_configfs_plane *plane = plane_item_to_vkms_configfs_plane(item);
+ int ret, val = 0;
+
+ ret = kstrtouint(page, 10, &val);
+ if (ret)
+ return ret;
+
+ /* Should be a supported value */
+ if (val & ~(BIT(DRM_COLOR_YCBCR_BT601) |
+ BIT(DRM_COLOR_YCBCR_BT709) |
+ BIT(DRM_COLOR_YCBCR_BT2020)))
+ return -EINVAL;
+ /* Should at least provide one color range */
+ if ((val & (BIT(DRM_COLOR_YCBCR_BT601) |
+ BIT(DRM_COLOR_YCBCR_BT709) |
+ BIT(DRM_COLOR_YCBCR_BT2020))) == 0)
+ return -EINVAL;
+
+ scoped_guard(mutex, &plane->dev->lock) {
+ /* Ensures that the default rotation is included in supported rotation */
+ if (plane->dev->enabled ||
+ (val & vkms_config_plane_get_supported_color_encoding(plane->config)) !=
+ val)
+ return -EINVAL;
+
+ vkms_config_plane_set_default_color_encoding(plane->config, val);
+ }
+
+ return count;
+}
+
CONFIGFS_ATTR(plane_, type);
CONFIGFS_ATTR(plane_, supported_rotations);
CONFIGFS_ATTR(plane_, default_rotation);
+CONFIGFS_ATTR(plane_, supported_color_encoding);
+CONFIGFS_ATTR(plane_, default_color_encoding);
static struct configfs_attribute *plane_item_attrs[] = {
&plane_attr_type,
&plane_attr_supported_rotations,
&plane_attr_default_rotation,
+ &plane_attr_supported_color_encoding,
+ &plane_attr_default_color_encoding,
NULL,
};
--
2.51.0
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