[RFC PATCH v2 13/17] drm/colorop: Add new IOCTLs to retrieve drm_colorop objects

[Harry Wentland <harry.wentland@amd.com>]

Since we created a new DRM object we need new IOCTLs (and
new libdrm functions) to retrieve those objects.

TODO: Can we make these IOCTLs and libdrm functions generic
to allow for new DRM objects in the future without the need
for new IOCTLs and libdrm functions?

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Pekka Paalanen <pekka.paalanen@collabora.com>
Cc: Simon Ser <contact@emersion.fr>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Melissa Wen <mwen@igalia.com>
Cc: Jonas Ådahl <jadahl@redhat.com>
Cc: Sebastian Wick <sebastian.wick@redhat.com>
Cc: Shashank Sharma <shashank.sharma@amd.com>
Cc: Alexander Goins <agoins@nvidia.com>
Cc: Joshua Ashton <joshua@froggi.es>
Cc: Michel Dänzer <mdaenzer@redhat.com>
Cc: Aleix Pol <aleixpol@kde.org>
Cc: Xaver Hugl <xaver.hugl@gmail.com>
Cc: Victoria Brekenfeld <victoria@system76.com>
Cc: Sima <daniel@ffwll.ch>
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Naseer Ahmed <quic_naseer@quicinc.com>
Cc: Christopher Braga <quic_cbraga@quicinc.com>
Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
Cc: Arthur Grillo <arthurgrillo@riseup.net>
Cc: Hector Martin <marcan@marcan.st>
Cc: Liviu Dudau <Liviu.Dudau@arm.com>
Cc: Sasha McIntosh <sashamcintosh@google.com>
---
 drivers/gpu/drm/drm_colorop.c       | 51 +++++++++++++++++++++++++++++
 drivers/gpu/drm/drm_crtc_internal.h |  4 +++
 drivers/gpu/drm/drm_ioctl.c         |  5 +++
 include/uapi/drm/drm_mode.h         | 21 ++++++++++++
 4 files changed, 81 insertions(+)

diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
index bc1250718baf..1afd5fbe8776 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -32,6 +32,57 @@
 
 /* TODO big colorop doc, including properties, etc. */
 
+/* IOCTLs */
+
+int drm_mode_getcolorop_res(struct drm_device *dev, void *data,
+			    struct drm_file *file_priv)
+{
+	struct drm_mode_get_colorop_res *colorop_resp = data;
+	struct drm_colorop *colorop;
+	uint32_t __user *colorop_ptr;
+	int count = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EOPNOTSUPP;
+
+	colorop_ptr = u64_to_user_ptr(colorop_resp->colorop_id_ptr);
+
+	/*
+	 * This ioctl is called twice, once to determine how much space is
+	 * needed, and the 2nd time to fill it.
+	 */
+	drm_for_each_colorop(colorop, dev) {
+		if (drm_lease_held(file_priv, colorop->base.id)) {
+			if (count < colorop_resp->count_colorops &&
+			    put_user(colorop->base.id, colorop_ptr + count))
+				return -EFAULT;
+			count++;
+		}
+	}
+	colorop_resp->count_colorops = count;
+
+	return 0;
+}
+
+int drm_mode_getcolorop(struct drm_device *dev, void *data,
+		        struct drm_file *file_priv)
+{
+	struct drm_mode_get_colorop *colorop_resp = data;
+	struct drm_colorop *colorop;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EOPNOTSUPP;
+
+	colorop = drm_colorop_find(dev, file_priv, colorop_resp->colorop_id);
+	if (!colorop)
+		return -ENOENT;
+
+	colorop_resp->colorop_id = colorop->base.id;
+	colorop_resp->plane_id = colorop->plane ? colorop->plane->base.id : 0;
+
+	return 0;
+}
+
 static const struct drm_prop_enum_list drm_colorop_type_enum_list[] = {
 	{ DRM_COLOROP_1D_CURVE, "1D Curve" },
 };
diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index 8556c3b3ff88..252cd7e607e3 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -278,6 +278,10 @@ int drm_mode_getplane(struct drm_device *dev,
 		      void *data, struct drm_file *file_priv);
 int drm_mode_setplane(struct drm_device *dev,
 		      void *data, struct drm_file *file_priv);
+int drm_mode_getcolorop_res(struct drm_device *dev, void *data,
+			    struct drm_file *file_priv);
+int drm_mode_getcolorop(struct drm_device *dev, void *data,
+		        struct drm_file *file_priv);
 int drm_mode_cursor_ioctl(struct drm_device *dev,
 			  void *data, struct drm_file *file_priv);
 int drm_mode_cursor2_ioctl(struct drm_device *dev,
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 77590b0f38fa..8a4b7d8d8a0b 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -717,6 +717,11 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER),
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER),
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER),
+
+	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCOLOROPRESOURCES, drm_mode_getcolorop_res, 0),
+	/* TODO do we need GETCOLOROP? */
+	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCOLOROP, drm_mode_getcolorop, 0),
+
 };
 
 #define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE(drm_ioctls)
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 009a800676ac..5c71eb011181 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -357,6 +357,27 @@ struct drm_mode_get_plane {
 	__u64 format_type_ptr;
 };
 
+struct drm_mode_get_colorop_res {
+	__u64 colorop_id_ptr;
+	__u32 count_colorops;
+};
+
+
+/**
+ * struct drm_mode_get_colorop - Get colorop metadata.
+ *
+ * Userspace can perform a GETCOLOROP ioctl to retrieve information about a
+ * colorop.
+ */
+struct drm_mode_get_colorop {
+	/**
+	 * @colorop_id: Object ID of the colorop whose information should be
+	 * retrieved. Set by caller.
+	 */
+	__u32 colorop_id;
+	__u32 plane_id;
+};
+
 struct drm_mode_get_plane_res {
 	__u64 plane_id_ptr;
 	__u32 count_planes;
-- 
2.42.0