[PATCH 08/22] drm/vkms: Introduce configfs for plane color range

[Louis Chauvet <louis.chauvet@bootlin.com>]

To allows the userspace to test many hardware configuration, introduce a
new interface to configure the available color ranges per planes. VKMS
supports multiple color ranges, so the userspace can choose any
combination.

The supported color ranges are configured by writing a color range bitmask
to the file `supported_color_ranges` and the default color range is
chosen by writing a color encoding bitmask to `default_color_range`.

Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
---
 Documentation/gpu/vkms.rst           |  7 ++-
 drivers/gpu/drm/vkms/vkms_configfs.c | 93 ++++++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+), 1 deletion(-)

diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
index 4ff75b53a386..979f8a545498 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 5 configurable attribute:
+Planes have 7 configurable attribute:
 
 - type: Plane type: 0 overlay, 1 primary, 2 cursor (same values as those
   exposed by the "type" property of a plane)
@@ -101,6 +101,11 @@ Planes have 5 configurable attribute:
   by the COLOR_ENCODING property of a plane)
 - default_color_encoding: Default color encoding presented to the userspace, same
   values as supported_color_encoding
+- supported_color_range: Available color range for a plane, as a bitmask:
+  0x1 DRM_COLOR_YCBCR_LIMITED_RANGE, 0x2 DRM_COLOR_YCBCR_FULL_RANGE (same values as
+  those exposed by the COLOR_RANGE property of a plane)
+- default_color_range: Default color range presented to the userspace, same
+  values as supported_color_range
 
 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 a4e0e054cf2d..0b280c73b0cc 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.c
+++ b/drivers/gpu/drm/vkms/vkms_configfs.c
@@ -412,6 +412,95 @@ static ssize_t plane_default_rotation_store(struct config_item *item,
 	return count;
 }
 
+static ssize_t plane_supported_color_range_show(struct config_item *item, char *page)
+{
+	struct vkms_configfs_plane *plane;
+	unsigned int supported_color_range;
+
+	plane = plane_item_to_vkms_configfs_plane(item);
+
+	scoped_guard(mutex, &plane->dev->lock) {
+		supported_color_range = vkms_config_plane_get_supported_color_range(plane->config);
+	}
+
+	return sprintf(page, "%u", supported_color_range);
+}
+
+static ssize_t plane_supported_color_range_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_LIMITED_RANGE) |
+		    BIT(DRM_COLOR_YCBCR_FULL_RANGE)))
+		return -EINVAL;
+	/* Should at least provide one color range */
+	if ((val & (BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
+		    BIT(DRM_COLOR_YCBCR_FULL_RANGE))) == 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_range(plane->config)) !=
+		     vkms_config_plane_get_default_color_range(plane->config))
+			return -EINVAL;
+		vkms_config_plane_set_supported_color_range(plane->config, val);
+	}
+
+	return count;
+}
+
+static ssize_t plane_default_color_range_show(struct config_item *item, char *page)
+{
+	struct vkms_configfs_plane *plane;
+	unsigned int default_color_range;
+
+	plane = plane_item_to_vkms_configfs_plane(item);
+
+	scoped_guard(mutex, &plane->dev->lock)
+		default_color_range = vkms_config_plane_get_default_color_range(plane->config);
+
+	return sprintf(page, "%u", default_color_range);
+}
+
+static ssize_t plane_default_color_range_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_LIMITED_RANGE) |
+		    BIT(DRM_COLOR_YCBCR_FULL_RANGE)))
+		return -EINVAL;
+	/* Should at least provide one color range */
+	if ((val & (BIT(DRM_COLOR_YCBCR_LIMITED_RANGE) |
+		    BIT(DRM_COLOR_YCBCR_FULL_RANGE))) == 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_range(plane->config)) !=
+		     val)
+			return -EINVAL;
+		vkms_config_plane_set_default_color_range(plane->config, val);
+	}
+
+	return count;
+}
+
 static ssize_t plane_supported_color_encoding_show(struct config_item *item, char *page)
 {
 	struct vkms_configfs_plane *plane;
@@ -513,6 +602,8 @@ static ssize_t plane_default_color_encoding_store(struct config_item *item,
 CONFIGFS_ATTR(plane_, type);
 CONFIGFS_ATTR(plane_, supported_rotations);
 CONFIGFS_ATTR(plane_, default_rotation);
+CONFIGFS_ATTR(plane_, supported_color_range);
+CONFIGFS_ATTR(plane_, default_color_range);
 CONFIGFS_ATTR(plane_, supported_color_encoding);
 CONFIGFS_ATTR(plane_, default_color_encoding);
 
@@ -520,6 +611,8 @@ static struct configfs_attribute *plane_item_attrs[] = {
 	&plane_attr_type,
 	&plane_attr_supported_rotations,
 	&plane_attr_default_rotation,
+	&plane_attr_supported_color_range,
+	&plane_attr_default_color_range,
 	&plane_attr_supported_color_encoding,
 	&plane_attr_default_color_encoding,
 	NULL,

-- 
2.51.0