Initial import

1 files changed, 5643 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
new file mode 100644
index 000000000..800a025dd
--- /dev/null
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -0,0 +1,5643 @@
+/*
+ * Copyright (c) 2006-2008 Intel Corporation
+ * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
+ * Copyright (c) 2008 Red Hat Inc.
+ *
+ * DRM core CRTC related functions
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ *
+ * Authors:
+ *      Keith Packard
+ *	Eric Anholt <eric@anholt.net>
+ *      Dave Airlie <airlied@linux.ie>
+ *      Jesse Barnes <jesse.barnes@intel.com>
+ */
+#include <linux/ctype.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_modeset_lock.h>
+#include <drm/drm_atomic.h>
+
+#include "drm_crtc_internal.h"
+#include "drm_internal.h"
+
+static struct drm_framebuffer *
+internal_framebuffer_create(struct drm_device *dev,
+			    struct drm_mode_fb_cmd2 *r,
+			    struct drm_file *file_priv);
+
+/* Avoid boilerplate.  I'm tired of typing. */
+#define DRM_ENUM_NAME_FN(fnname, list)				\
+	const char *fnname(int val)				\
+	{							\
+		int i;						\
+		for (i = 0; i < ARRAY_SIZE(list); i++) {	\
+			if (list[i].type == val)		\
+				return list[i].name;		\
+		}						\
+		return "(unknown)";				\
+	}
+
+/*
+ * Global properties
+ */
+static const struct drm_prop_enum_list drm_dpms_enum_list[] = {
+	{ DRM_MODE_DPMS_ON, "On" },
+	{ DRM_MODE_DPMS_STANDBY, "Standby" },
+	{ DRM_MODE_DPMS_SUSPEND, "Suspend" },
+	{ DRM_MODE_DPMS_OFF, "Off" }
+};
+
+DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)
+
+static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
+	{ DRM_PLANE_TYPE_OVERLAY, "Overlay" },
+	{ DRM_PLANE_TYPE_PRIMARY, "Primary" },
+	{ DRM_PLANE_TYPE_CURSOR, "Cursor" },
+};
+
+/*
+ * Optional properties
+ */
+static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = {
+	{ DRM_MODE_SCALE_NONE, "None" },
+	{ DRM_MODE_SCALE_FULLSCREEN, "Full" },
+	{ DRM_MODE_SCALE_CENTER, "Center" },
+	{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
+};
+
+static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
+	{ DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
+	{ DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
+	{ DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
+};
+
+/*
+ * Non-global properties, but "required" for certain connectors.
+ */
+static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = {
+	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
+	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
+	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
+};
+
+DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)
+
+static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = {
+	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
+	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
+	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
+};
+
+DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
+		 drm_dvi_i_subconnector_enum_list)
+
+static const struct drm_prop_enum_list drm_tv_select_enum_list[] = {
+	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
+	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
+	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
+	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
+	{ DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
+};
+
+DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)
+
+static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
+	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
+	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
+	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
+	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
+	{ DRM_MODE_SUBCONNECTOR_SCART,     "SCART"     }, /* TV-out */
+};
+
+DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
+		 drm_tv_subconnector_enum_list)
+
+static const struct drm_prop_enum_list drm_dirty_info_enum_list[] = {
+	{ DRM_MODE_DIRTY_OFF,      "Off"      },
+	{ DRM_MODE_DIRTY_ON,       "On"       },
+	{ DRM_MODE_DIRTY_ANNOTATE, "Annotate" },
+};
+
+struct drm_conn_prop_enum_list {
+	int type;
+	const char *name;
+	struct ida ida;
+};
+
+/*
+ * Connector and encoder types.
+ */
+static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
+	{ DRM_MODE_CONNECTOR_Unknown, "Unknown" },
+	{ DRM_MODE_CONNECTOR_VGA, "VGA" },
+	{ DRM_MODE_CONNECTOR_DVII, "DVI-I" },
+	{ DRM_MODE_CONNECTOR_DVID, "DVI-D" },
+	{ DRM_MODE_CONNECTOR_DVIA, "DVI-A" },
+	{ DRM_MODE_CONNECTOR_Composite, "Composite" },
+	{ DRM_MODE_CONNECTOR_SVIDEO, "SVIDEO" },
+	{ DRM_MODE_CONNECTOR_LVDS, "LVDS" },
+	{ DRM_MODE_CONNECTOR_Component, "Component" },
+	{ DRM_MODE_CONNECTOR_9PinDIN, "DIN" },
+	{ DRM_MODE_CONNECTOR_DisplayPort, "DP" },
+	{ DRM_MODE_CONNECTOR_HDMIA, "HDMI-A" },
+	{ DRM_MODE_CONNECTOR_HDMIB, "HDMI-B" },
+	{ DRM_MODE_CONNECTOR_TV, "TV" },
+	{ DRM_MODE_CONNECTOR_eDP, "eDP" },
+	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
+	{ DRM_MODE_CONNECTOR_DSI, "DSI" },
+};
+
+static const struct drm_prop_enum_list drm_encoder_enum_list[] = {
+	{ DRM_MODE_ENCODER_NONE, "None" },
+	{ DRM_MODE_ENCODER_DAC, "DAC" },
+	{ DRM_MODE_ENCODER_TMDS, "TMDS" },
+	{ DRM_MODE_ENCODER_LVDS, "LVDS" },
+	{ DRM_MODE_ENCODER_TVDAC, "TV" },
+	{ DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
+	{ DRM_MODE_ENCODER_DSI, "DSI" },
+	{ DRM_MODE_ENCODER_DPMST, "DP MST" },
+};
+
+static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
+	{ SubPixelUnknown, "Unknown" },
+	{ SubPixelHorizontalRGB, "Horizontal RGB" },
+	{ SubPixelHorizontalBGR, "Horizontal BGR" },
+	{ SubPixelVerticalRGB, "Vertical RGB" },
+	{ SubPixelVerticalBGR, "Vertical BGR" },
+	{ SubPixelNone, "None" },
+};
+
+void drm_connector_ida_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
+		ida_init(&drm_connector_enum_list[i].ida);
+}
+
+void drm_connector_ida_destroy(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
+		ida_destroy(&drm_connector_enum_list[i].ida);
+}
+
+/**
+ * drm_get_connector_status_name - return a string for connector status
+ * @status: connector status to compute name of
+ *
+ * In contrast to the other drm_get_*_name functions this one here returns a
+ * const pointer and hence is threadsafe.
+ */
+const char *drm_get_connector_status_name(enum drm_connector_status status)
+{
+	if (status == connector_status_connected)
+		return "connected";
+	else if (status == connector_status_disconnected)
+		return "disconnected";
+	else
+		return "unknown";
+}
+EXPORT_SYMBOL(drm_get_connector_status_name);
+
+/**
+ * drm_get_subpixel_order_name - return a string for a given subpixel enum
+ * @order: enum of subpixel_order
+ *
+ * Note you could abuse this and return something out of bounds, but that
+ * would be a caller error.  No unscrubbed user data should make it here.
+ */
+const char *drm_get_subpixel_order_name(enum subpixel_order order)
+{
+	return drm_subpixel_enum_list[order].name;
+}
+EXPORT_SYMBOL(drm_get_subpixel_order_name);
+
+static char printable_char(int c)
+{
+	return isascii(c) && isprint(c) ? c : '?';
+}
+
+/**
+ * drm_get_format_name - return a string for drm fourcc format
+ * @format: format to compute name of
+ *
+ * Note that the buffer used by this function is globally shared and owned by
+ * the function itself.
+ *
+ * FIXME: This isn't really multithreading safe.
+ */
+const char *drm_get_format_name(uint32_t format)
+{
+	static char buf[32];
+
+	snprintf(buf, sizeof(buf),
+		 "%c%c%c%c %s-endian (0x%08x)",
+		 printable_char(format & 0xff),
+		 printable_char((format >> 8) & 0xff),
+		 printable_char((format >> 16) & 0xff),
+		 printable_char((format >> 24) & 0x7f),
+		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
+		 format);
+
+	return buf;
+}
+EXPORT_SYMBOL(drm_get_format_name);
+
+/*
+ * Internal function to assign a slot in the object idr and optionally
+ * register the object into the idr.
+ */
+static int drm_mode_object_get_reg(struct drm_device *dev,
+				   struct drm_mode_object *obj,
+				   uint32_t obj_type,
+				   bool register_obj)
+{
+	int ret;
+
+	mutex_lock(&dev->mode_config.idr_mutex);
+	ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL);
+	if (ret >= 0) {
+		/*
+		 * Set up the object linking under the protection of the idr
+		 * lock so that other users can't see inconsistent state.
+		 */
+		obj->id = ret;
+		obj->type = obj_type;
+	}
+	mutex_unlock(&dev->mode_config.idr_mutex);
+
+	return ret < 0 ? ret : 0;
+}
+
+/**
+ * drm_mode_object_get - allocate a new modeset identifier
+ * @dev: DRM device
+ * @obj: object pointer, used to generate unique ID
+ * @obj_type: object type
+ *
+ * Create a unique identifier based on @ptr in @dev's identifier space.  Used
+ * for tracking modes, CRTCs and connectors. Note that despite the _get postfix
+ * modeset identifiers are _not_ reference counted. Hence don't use this for
+ * reference counted modeset objects like framebuffers.
+ *
+ * Returns:
+ * New unique (relative to other objects in @dev) integer identifier for the
+ * object.
+ */
+int drm_mode_object_get(struct drm_device *dev,
+			struct drm_mode_object *obj, uint32_t obj_type)
+{
+	return drm_mode_object_get_reg(dev, obj, obj_type, true);
+}
+
+static void drm_mode_object_register(struct drm_device *dev,
+				     struct drm_mode_object *obj)
+{
+	mutex_lock(&dev->mode_config.idr_mutex);
+	idr_replace(&dev->mode_config.crtc_idr, obj, obj->id);
+	mutex_unlock(&dev->mode_config.idr_mutex);
+}
+
+/**
+ * drm_mode_object_put - free a modeset identifer
+ * @dev: DRM device
+ * @object: object to free
+ *
+ * Free @id from @dev's unique identifier pool. Note that despite the _get
+ * postfix modeset identifiers are _not_ reference counted. Hence don't use this
+ * for reference counted modeset objects like framebuffers.
+ */
+void drm_mode_object_put(struct drm_device *dev,
+			 struct drm_mode_object *object)
+{
+	mutex_lock(&dev->mode_config.idr_mutex);
+	idr_remove(&dev->mode_config.crtc_idr, object->id);
+	mutex_unlock(&dev->mode_config.idr_mutex);
+}
+
+static struct drm_mode_object *_object_find(struct drm_device *dev,
+		uint32_t id, uint32_t type)
+{
+	struct drm_mode_object *obj = NULL;
+
+	mutex_lock(&dev->mode_config.idr_mutex);
+	obj = idr_find(&dev->mode_config.crtc_idr, id);
+	if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
+		obj = NULL;
+	if (obj && obj->id != id)
+		obj = NULL;
+	/* don't leak out unref'd fb's */
+	if (obj && (obj->type == DRM_MODE_OBJECT_FB))
+		obj = NULL;
+	mutex_unlock(&dev->mode_config.idr_mutex);
+
+	return obj;
+}
+
+/**
+ * drm_mode_object_find - look up a drm object with static lifetime
+ * @dev: drm device
+ * @id: id of the mode object
+ * @type: type of the mode object
+ *
+ * Note that framebuffers cannot be looked up with this functions - since those
+ * are reference counted, they need special treatment.  Even with
+ * DRM_MODE_OBJECT_ANY (although that will simply return NULL
+ * rather than WARN_ON()).
+ */
+struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
+		uint32_t id, uint32_t type)
+{
+	struct drm_mode_object *obj = NULL;
+
+	/* Framebuffers are reference counted and need their own lookup
+	 * function.*/
+	WARN_ON(type == DRM_MODE_OBJECT_FB);
+	obj = _object_find(dev, id, type);
+	return obj;
+}
+EXPORT_SYMBOL(drm_mode_object_find);
+
+/**
+ * drm_framebuffer_init - initialize a framebuffer
+ * @dev: DRM device
+ * @fb: framebuffer to be initialized
+ * @funcs: ... with these functions
+ *
+ * Allocates an ID for the framebuffer's parent mode object, sets its mode
+ * functions & device file and adds it to the master fd list.
+ *
+ * IMPORTANT:
+ * This functions publishes the fb and makes it available for concurrent access
+ * by other users. Which means by this point the fb _must_ be fully set up -
+ * since all the fb attributes are invariant over its lifetime, no further
+ * locking but only correct reference counting is required.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
+			 const struct drm_framebuffer_funcs *funcs)
+{
+	int ret;
+
+	mutex_lock(&dev->mode_config.fb_lock);
+	kref_init(&fb->refcount);
+	INIT_LIST_HEAD(&fb->filp_head);
+	fb->dev = dev;
+	fb->funcs = funcs;
+
+	ret = drm_mode_object_get(dev, &fb->base, DRM_MODE_OBJECT_FB);
+	if (ret)
+		goto out;
+
+	dev->mode_config.num_fb++;
+	list_add(&fb->head, &dev->mode_config.fb_list);
+out:
+	mutex_unlock(&dev->mode_config.fb_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_framebuffer_init);
+
+/* dev->mode_config.fb_lock must be held! */
+static void __drm_framebuffer_unregister(struct drm_device *dev,
+					 struct drm_framebuffer *fb)
+{
+	mutex_lock(&dev->mode_config.idr_mutex);
+	idr_remove(&dev->mode_config.crtc_idr, fb->base.id);
+	mutex_unlock(&dev->mode_config.idr_mutex);
+
+	fb->base.id = 0;
+}
+
+static void drm_framebuffer_free(struct kref *kref)
+{
+	struct drm_framebuffer *fb =
+			container_of(kref, struct drm_framebuffer, refcount);
+	struct drm_device *dev = fb->dev;
+
+	/*
+	 * The lookup idr holds a weak reference, which has not necessarily been
+	 * removed at this point. Check for that.
+	 */
+	mutex_lock(&dev->mode_config.fb_lock);
+	if (fb->base.id) {
+		/* Mark fb as reaped and drop idr ref. */
+		__drm_framebuffer_unregister(dev, fb);
+	}
+	mutex_unlock(&dev->mode_config.fb_lock);
+
+	fb->funcs->destroy(fb);
+}
+
+static struct drm_framebuffer *__drm_framebuffer_lookup(struct drm_device *dev,
+							uint32_t id)
+{
+	struct drm_mode_object *obj = NULL;
+	struct drm_framebuffer *fb;
+
+	mutex_lock(&dev->mode_config.idr_mutex);
+	obj = idr_find(&dev->mode_config.crtc_idr, id);
+	if (!obj || (obj->type != DRM_MODE_OBJECT_FB) || (obj->id != id))
+		fb = NULL;
+	else
+		fb = obj_to_fb(obj);
+	mutex_unlock(&dev->mode_config.idr_mutex);
+
+	return fb;
+}
+
+/**
+ * drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
+ * @dev: drm device
+ * @id: id of the fb object
+ *
+ * If successful, this grabs an additional reference to the framebuffer -
+ * callers need to make sure to eventually unreference the returned framebuffer
+ * again, using @drm_framebuffer_unreference.
+ */
+struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
+					       uint32_t id)
+{
+	struct drm_framebuffer *fb;
+
+	mutex_lock(&dev->mode_config.fb_lock);
+	fb = __drm_framebuffer_lookup(dev, id);
+	if (fb) {
+		if (!kref_get_unless_zero(&fb->refcount))
+			fb = NULL;
+	}
+	mutex_unlock(&dev->mode_config.fb_lock);
+
+	return fb;
+}
+EXPORT_SYMBOL(drm_framebuffer_lookup);
+
+/**
+ * drm_framebuffer_unreference - unref a framebuffer
+ * @fb: framebuffer to unref
+ *
+ * This functions decrements the fb's refcount and frees it if it drops to zero.
+ */
+void drm_framebuffer_unreference(struct drm_framebuffer *fb)
+{
+	DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
+	kref_put(&fb->refcount, drm_framebuffer_free);
+}
+EXPORT_SYMBOL(drm_framebuffer_unreference);
+
+/**
+ * drm_framebuffer_reference - incr the fb refcnt
+ * @fb: framebuffer
+ *
+ * This functions increments the fb's refcount.
+ */
+void drm_framebuffer_reference(struct drm_framebuffer *fb)
+{
+	DRM_DEBUG("%p: FB ID: %d (%d)\n", fb, fb->base.id, atomic_read(&fb->refcount.refcount));
+	kref_get(&fb->refcount);
+}
+EXPORT_SYMBOL(drm_framebuffer_reference);
+
+/**
+ * drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
+ * @fb: fb to unregister
+ *
+ * Drivers need to call this when cleaning up driver-private framebuffers, e.g.
+ * those used for fbdev. Note that the caller must hold a reference of it's own,
+ * i.e. the object may not be destroyed through this call (since it'll lead to a
+ * locking inversion).
+ */
+void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
+{
+	struct drm_device *dev = fb->dev;
+
+	mutex_lock(&dev->mode_config.fb_lock);
+	/* Mark fb as reaped and drop idr ref. */
+	__drm_framebuffer_unregister(dev, fb);
+	mutex_unlock(&dev->mode_config.fb_lock);
+}
+EXPORT_SYMBOL(drm_framebuffer_unregister_private);
+
+/**
+ * drm_framebuffer_cleanup - remove a framebuffer object
+ * @fb: framebuffer to remove
+ *
+ * Cleanup framebuffer. This function is intended to be used from the drivers
+ * ->destroy callback. It can also be used to clean up driver private
+ *  framebuffers embedded into a larger structure.
+ *
+ * Note that this function does not remove the fb from active usuage - if it is
+ * still used anywhere, hilarity can ensue since userspace could call getfb on
+ * the id and get back -EINVAL. Obviously no concern at driver unload time.
+ *
+ * Also, the framebuffer will not be removed from the lookup idr - for
+ * user-created framebuffers this will happen in in the rmfb ioctl. For
+ * driver-private objects (e.g. for fbdev) drivers need to explicitly call
+ * drm_framebuffer_unregister_private.
+ */
+void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
+{
+	struct drm_device *dev = fb->dev;
+
+	mutex_lock(&dev->mode_config.fb_lock);
+	list_del(&fb->head);
+	dev->mode_config.num_fb--;
+	mutex_unlock(&dev->mode_config.fb_lock);
+}
+EXPORT_SYMBOL(drm_framebuffer_cleanup);
+
+/**
+ * drm_framebuffer_remove - remove and unreference a framebuffer object
+ * @fb: framebuffer to remove
+ *
+ * Scans all the CRTCs and planes in @dev's mode_config.  If they're
+ * using @fb, removes it, setting it to NULL. Then drops the reference to the
+ * passed-in framebuffer. Might take the modeset locks.
+ *
+ * Note that this function optimizes the cleanup away if the caller holds the
+ * last reference to the framebuffer. It is also guaranteed to not take the
+ * modeset locks in this case.
+ */
+void drm_framebuffer_remove(struct drm_framebuffer *fb)
+{
+	struct drm_device *dev = fb->dev;
+	struct drm_crtc *crtc;
+	struct drm_plane *plane;
+	struct drm_mode_set set;
+	int ret;
+
+	WARN_ON(!list_empty(&fb->filp_head));
+
+	/*
+	 * drm ABI mandates that we remove any deleted framebuffers from active
+	 * useage. But since most sane clients only remove framebuffers they no
+	 * longer need, try to optimize this away.
+	 *
+	 * Since we're holding a reference ourselves, observing a refcount of 1
+	 * means that we're the last holder and can skip it. Also, the refcount
+	 * can never increase from 1 again, so we don't need any barriers or
+	 * locks.
+	 *
+	 * Note that userspace could try to race with use and instate a new
+	 * usage _after_ we've cleared all current ones. End result will be an
+	 * in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
+	 * in this manner.
+	 */
+	if (atomic_read(&fb->refcount.refcount) > 1) {
+		drm_modeset_lock_all(dev);
+		/* remove from any CRTC */
+		list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+			if (crtc->primary->fb == fb) {
+				/* should turn off the crtc */
+				memset(&set, 0, sizeof(struct drm_mode_set));
+				set.crtc = crtc;
+				set.fb = NULL;
+				ret = drm_mode_set_config_internal(&set);
+				if (ret)
+					DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
+			}
+		}
+
+		list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
+			if (plane->fb == fb)
+				drm_plane_force_disable(plane);
+		}
+		drm_modeset_unlock_all(dev);
+	}
+
+	drm_framebuffer_unreference(fb);
+}
+EXPORT_SYMBOL(drm_framebuffer_remove);
+
+DEFINE_WW_CLASS(crtc_ww_class);
+
+/**
+ * drm_crtc_init_with_planes - Initialise a new CRTC object with
+ *    specified primary and cursor planes.
+ * @dev: DRM device
+ * @crtc: CRTC object to init
+ * @primary: Primary plane for CRTC
+ * @cursor: Cursor plane for CRTC
+ * @funcs: callbacks for the new CRTC
+ *
+ * Inits a new object created as base part of a driver crtc object.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
+			      struct drm_plane *primary,
+			      struct drm_plane *cursor,
+			      const struct drm_crtc_funcs *funcs)
+{
+	struct drm_mode_config *config = &dev->mode_config;
+	int ret;
+
+	WARN_ON(primary && primary->type != DRM_PLANE_TYPE_PRIMARY);
+	WARN_ON(cursor && cursor->type != DRM_PLANE_TYPE_CURSOR);
+
+	crtc->dev = dev;
+	crtc->funcs = funcs;
+	crtc->invert_dimensions = false;
+
+	drm_modeset_lock_init(&crtc->mutex);
+	ret = drm_mode_object_get(dev, &crtc->base, DRM_MODE_OBJECT_CRTC);
+	if (ret)
+		return ret;
+
+	crtc->base.properties = &crtc->properties;
+
+	list_add_tail(&crtc->head, &config->crtc_list);
+	config->num_crtc++;
+
+	crtc->primary = primary;
+	crtc->cursor = cursor;
+	if (primary)
+		primary->possible_crtcs = 1 << drm_crtc_index(crtc);
+	if (cursor)
+		cursor->possible_crtcs = 1 << drm_crtc_index(crtc);
+
+	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
+		drm_object_attach_property(&crtc->base, config->prop_active, 0);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_crtc_init_with_planes);
+
+/**
+ * drm_crtc_cleanup - Clean up the core crtc usage
+ * @crtc: CRTC to cleanup
+ *
+ * This function cleans up @crtc and removes it from the DRM mode setting
+ * core. Note that the function does *not* free the crtc structure itself,
+ * this is the responsibility of the caller.
+ */
+void drm_crtc_cleanup(struct drm_crtc *crtc)
+{
+	struct drm_device *dev = crtc->dev;
+
+	kfree(crtc->gamma_store);
+	crtc->gamma_store = NULL;
+
+	drm_modeset_lock_fini(&crtc->mutex);
+
+	drm_mode_object_put(dev, &crtc->base);
+	list_del(&crtc->head);
+	dev->mode_config.num_crtc--;
+
+	WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state);
+	if (crtc->state && crtc->funcs->atomic_destroy_state)
+		crtc->funcs->atomic_destroy_state(crtc, crtc->state);
+
+	memset(crtc, 0, sizeof(*crtc));
+}
+EXPORT_SYMBOL(drm_crtc_cleanup);
+
+/**
+ * drm_crtc_index - find the index of a registered CRTC
+ * @crtc: CRTC to find index for
+ *
+ * Given a registered CRTC, return the index of that CRTC within a DRM
+ * device's list of CRTCs.
+ */
+unsigned int drm_crtc_index(struct drm_crtc *crtc)
+{
+	unsigned int index = 0;
+	struct drm_crtc *tmp;
+
+	list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head) {
+		if (tmp == crtc)
+			return index;
+
+		index++;
+	}
+
+	BUG();
+}
+EXPORT_SYMBOL(drm_crtc_index);
+
+/*
+ * drm_mode_remove - remove and free a mode
+ * @connector: connector list to modify
+ * @mode: mode to remove
+ *
+ * Remove @mode from @connector's mode list, then free it.
+ */
+static void drm_mode_remove(struct drm_connector *connector,
+			    struct drm_display_mode *mode)
+{
+	list_del(&mode->head);
+	drm_mode_destroy(connector->dev, mode);
+}
+
+/**
+ * drm_display_info_set_bus_formats - set the supported bus formats
+ * @info: display info to store bus formats in
+ * @formats: array containing the supported bus formats
+ * @num_formats: the number of entries in the fmts array
+ *
+ * Store the supported bus formats in display info structure.
+ * See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
+ * a full list of available formats.
+ */
+int drm_display_info_set_bus_formats(struct drm_display_info *info,
+				     const u32 *formats,
+				     unsigned int num_formats)
+{
+	u32 *fmts = NULL;
+
+	if (!formats && num_formats)
+		return -EINVAL;
+
+	if (formats && num_formats) {
+		fmts = kmemdup(formats, sizeof(*formats) * num_formats,
+			       GFP_KERNEL);
+		if (!fmts)
+			return -ENOMEM;
+	}
+
+	kfree(info->bus_formats);
+	info->bus_formats = fmts;
+	info->num_bus_formats = num_formats;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_display_info_set_bus_formats);
+
+/**
+ * drm_connector_get_cmdline_mode - reads the user's cmdline mode
+ * @connector: connector to quwery
+ *
+ * The kernel supports per-connector configration of its consoles through
+ * use of the video= parameter. This function parses that option and
+ * extracts the user's specified mode (or enable/disable status) for a
+ * particular connector. This is typically only used during the early fbdev
+ * setup.
+ */
+static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
+{
+	struct drm_cmdline_mode *mode = &connector->cmdline_mode;
+	char *option = NULL;
+
+	if (fb_get_options(connector->name, &option))
+		return;
+
+	if (!drm_mode_parse_command_line_for_connector(option,
+						       connector,
+						       mode))
+		return;
+
+	if (mode->force) {
+		const char *s;
+
+		switch (mode->force) {
+		case DRM_FORCE_OFF:
+			s = "OFF";
+			break;
+		case DRM_FORCE_ON_DIGITAL:
+			s = "ON - dig";
+			break;
+		default:
+		case DRM_FORCE_ON:
+			s = "ON";
+			break;
+		}
+
+		DRM_INFO("forcing %s connector %s\n", connector->name, s);
+		connector->force = mode->force;
+	}
+
+	DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
+		      connector->name,
+		      mode->xres, mode->yres,
+		      mode->refresh_specified ? mode->refresh : 60,
+		      mode->rb ? " reduced blanking" : "",
+		      mode->margins ? " with margins" : "",
+		      mode->interlace ?  " interlaced" : "");
+}
+
+/**
+ * drm_connector_init - Init a preallocated connector
+ * @dev: DRM device
+ * @connector: the connector to init
+ * @funcs: callbacks for this connector
+ * @connector_type: user visible type of the connector
+ *
+ * Initialises a preallocated connector. Connectors should be
+ * subclassed as part of driver connector objects.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_connector_init(struct drm_device *dev,
+		       struct drm_connector *connector,
+		       const struct drm_connector_funcs *funcs,
+		       int connector_type)
+{
+	struct drm_mode_config *config = &dev->mode_config;
+	int ret;
+	struct ida *connector_ida =
+		&drm_connector_enum_list[connector_type].ida;
+
+	drm_modeset_lock_all(dev);
+
+	ret = drm_mode_object_get_reg(dev, &connector->base, DRM_MODE_OBJECT_CONNECTOR, false);
+	if (ret)
+		goto out_unlock;
+
+	connector->base.properties = &connector->properties;
+	connector->dev = dev;
+	connector->funcs = funcs;
+	connector->connector_type = connector_type;
+	connector->connector_type_id =
+		ida_simple_get(connector_ida, 1, 0, GFP_KERNEL);
+	if (connector->connector_type_id < 0) {
+		ret = connector->connector_type_id;
+		goto out_put;
+	}
+	connector->name =
+		kasprintf(GFP_KERNEL, "%s-%d",
+			  drm_connector_enum_list[connector_type].name,
+			  connector->connector_type_id);
+	if (!connector->name) {
+		ret = -ENOMEM;
+		goto out_put;
+	}
+
+	INIT_LIST_HEAD(&connector->probed_modes);
+	INIT_LIST_HEAD(&connector->modes);
+	connector->edid_blob_ptr = NULL;
+	connector->status = connector_status_unknown;
+
+	drm_connector_get_cmdline_mode(connector);
+
+	/* We should add connectors at the end to avoid upsetting the connector
+	 * index too much. */
+	list_add_tail(&connector->head, &config->connector_list);
+	config->num_connector++;
+
+	if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL)
+		drm_object_attach_property(&connector->base,
+					      config->edid_property,
+					      0);
+
+	drm_object_attach_property(&connector->base,
+				      config->dpms_property, 0);
+
+	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
+		drm_object_attach_property(&connector->base, config->prop_crtc_id, 0);
+	}
+
+	connector->debugfs_entry = NULL;
+
+out_put:
+	if (ret)
+		drm_mode_object_put(dev, &connector->base);
+
+out_unlock:
+	drm_modeset_unlock_all(dev);
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_connector_init);
+
+/**
+ * drm_connector_cleanup - cleans up an initialised connector
+ * @connector: connector to cleanup
+ *
+ * Cleans up the connector but doesn't free the object.
+ */
+void drm_connector_cleanup(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct drm_display_mode *mode, *t;
+
+	if (connector->tile_group) {
+		drm_mode_put_tile_group(dev, connector->tile_group);
+		connector->tile_group = NULL;
+	}
+
+	list_for_each_entry_safe(mode, t, &connector->probed_modes, head)
+		drm_mode_remove(connector, mode);
+
+	list_for_each_entry_safe(mode, t, &connector->modes, head)
+		drm_mode_remove(connector, mode);
+
+	ida_remove(&drm_connector_enum_list[connector->connector_type].ida,
+		   connector->connector_type_id);
+
+	kfree(connector->display_info.bus_formats);
+	drm_mode_object_put(dev, &connector->base);
+	kfree(connector->name);
+	connector->name = NULL;
+	list_del(&connector->head);
+	dev->mode_config.num_connector--;
+
+	WARN_ON(connector->state && !connector->funcs->atomic_destroy_state);
+	if (connector->state && connector->funcs->atomic_destroy_state)
+		connector->funcs->atomic_destroy_state(connector,
+						       connector->state);
+
+	memset(connector, 0, sizeof(*connector));
+}
+EXPORT_SYMBOL(drm_connector_cleanup);
+
+/**
+ * drm_connector_index - find the index of a registered connector
+ * @connector: connector to find index for
+ *
+ * Given a registered connector, return the index of that connector within a DRM
+ * device's list of connectors.
+ */
+unsigned int drm_connector_index(struct drm_connector *connector)
+{
+	unsigned int index = 0;
+	struct drm_connector *tmp;
+	struct drm_mode_config *config = &connector->dev->mode_config;
+
+	WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
+
+	list_for_each_entry(tmp, &connector->dev->mode_config.connector_list, head) {
+		if (tmp == connector)
+			return index;
+
+		index++;
+	}
+
+	BUG();
+}
+EXPORT_SYMBOL(drm_connector_index);
+
+/**
+ * drm_connector_register - register a connector
+ * @connector: the connector to register
+ *
+ * Register userspace interfaces for a connector
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_connector_register(struct drm_connector *connector)
+{
+	int ret;
+
+	drm_mode_object_register(connector->dev, &connector->base);
+
+	ret = drm_sysfs_connector_add(connector);
+	if (ret)
+		return ret;
+
+	ret = drm_debugfs_connector_add(connector);
+	if (ret) {
+		drm_sysfs_connector_remove(connector);
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_connector_register);
+
+/**
+ * drm_connector_unregister - unregister a connector
+ * @connector: the connector to unregister
+ *
+ * Unregister userspace interfaces for a connector
+ */
+void drm_connector_unregister(struct drm_connector *connector)
+{
+	drm_sysfs_connector_remove(connector);
+	drm_debugfs_connector_remove(connector);
+}
+EXPORT_SYMBOL(drm_connector_unregister);
+
+
+/**
+ * drm_connector_unplug_all - unregister connector userspace interfaces
+ * @dev: drm device
+ *
+ * This function unregisters all connector userspace interfaces in sysfs. Should
+ * be call when the device is disconnected, e.g. from an usb driver's
+ * ->disconnect callback.
+ */
+void drm_connector_unplug_all(struct drm_device *dev)
+{
+	struct drm_connector *connector;
+
+	/* taking the mode config mutex ends up in a clash with sysfs */
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+		drm_connector_unregister(connector);
+
+}
+EXPORT_SYMBOL(drm_connector_unplug_all);
+
+/**
+ * drm_encoder_init - Init a preallocated encoder
+ * @dev: drm device
+ * @encoder: the encoder to init
+ * @funcs: callbacks for this encoder
+ * @encoder_type: user visible type of the encoder
+ *
+ * Initialises a preallocated encoder. Encoder should be
+ * subclassed as part of driver encoder objects.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_encoder_init(struct drm_device *dev,
+		      struct drm_encoder *encoder,
+		      const struct drm_encoder_funcs *funcs,
+		      int encoder_type)
+{
+	int ret;
+
+	drm_modeset_lock_all(dev);
+
+	ret = drm_mode_object_get(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER);
+	if (ret)
+		goto out_unlock;
+
+	encoder->dev = dev;
+	encoder->encoder_type = encoder_type;
+	encoder->funcs = funcs;
+	encoder->name = kasprintf(GFP_KERNEL, "%s-%d",
+				  drm_encoder_enum_list[encoder_type].name,
+				  encoder->base.id);
+	if (!encoder->name) {
+		ret = -ENOMEM;
+		goto out_put;
+	}
+
+	list_add_tail(&encoder->head, &dev->mode_config.encoder_list);
+	dev->mode_config.num_encoder++;
+
+out_put:
+	if (ret)
+		drm_mode_object_put(dev, &encoder->base);
+
+out_unlock:
+	drm_modeset_unlock_all(dev);
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_encoder_init);
+
+/**
+ * drm_encoder_cleanup - cleans up an initialised encoder
+ * @encoder: encoder to cleanup
+ *
+ * Cleans up the encoder but doesn't free the object.
+ */
+void drm_encoder_cleanup(struct drm_encoder *encoder)
+{
+	struct drm_device *dev = encoder->dev;
+
+	drm_modeset_lock_all(dev);
+	drm_mode_object_put(dev, &encoder->base);
+	kfree(encoder->name);
+	list_del(&encoder->head);
+	dev->mode_config.num_encoder--;
+	drm_modeset_unlock_all(dev);
+
+	memset(encoder, 0, sizeof(*encoder));
+}
+EXPORT_SYMBOL(drm_encoder_cleanup);
+
+/**
+ * drm_universal_plane_init - Initialize a new universal plane object
+ * @dev: DRM device
+ * @plane: plane object to init
+ * @possible_crtcs: bitmask of possible CRTCs
+ * @funcs: callbacks for the new plane
+ * @formats: array of supported formats (%DRM_FORMAT_*)
+ * @format_count: number of elements in @formats
+ * @type: type of plane (overlay, primary, cursor)
+ *
+ * Initializes a plane object of type @type.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
+			     unsigned long possible_crtcs,
+			     const struct drm_plane_funcs *funcs,
+			     const uint32_t *formats, uint32_t format_count,
+			     enum drm_plane_type type)
+{
+	struct drm_mode_config *config = &dev->mode_config;
+	int ret;
+
+	ret = drm_mode_object_get(dev, &plane->base, DRM_MODE_OBJECT_PLANE);
+	if (ret)
+		return ret;
+
+	drm_modeset_lock_init(&plane->mutex);
+
+	plane->base.properties = &plane->properties;
+	plane->dev = dev;
+	plane->funcs = funcs;
+	plane->format_types = kmalloc_array(format_count, sizeof(uint32_t),
+					    GFP_KERNEL);
+	if (!plane->format_types) {
+		DRM_DEBUG_KMS("out of memory when allocating plane\n");
+		drm_mode_object_put(dev, &plane->base);
+		return -ENOMEM;
+	}
+
+	memcpy(plane->format_types, formats, format_count * sizeof(uint32_t));
+	plane->format_count = format_count;
+	plane->possible_crtcs = possible_crtcs;
+	plane->type = type;
+
+	list_add_tail(&plane->head, &config->plane_list);
+	config->num_total_plane++;
+	if (plane->type == DRM_PLANE_TYPE_OVERLAY)
+		config->num_overlay_plane++;
+
+	drm_object_attach_property(&plane->base,
+				   config->plane_type_property,
+				   plane->type);
+
+	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
+		drm_object_attach_property(&plane->base, config->prop_fb_id, 0);
+		drm_object_attach_property(&plane->base, config->prop_crtc_id, 0);
+		drm_object_attach_property(&plane->base, config->prop_crtc_x, 0);
+		drm_object_attach_property(&plane->base, config->prop_crtc_y, 0);
+		drm_object_attach_property(&plane->base, config->prop_crtc_w, 0);
+		drm_object_attach_property(&plane->base, config->prop_crtc_h, 0);
+		drm_object_attach_property(&plane->base, config->prop_src_x, 0);
+		drm_object_attach_property(&plane->base, config->prop_src_y, 0);
+		drm_object_attach_property(&plane->base, config->prop_src_w, 0);
+		drm_object_attach_property(&plane->base, config->prop_src_h, 0);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_universal_plane_init);
+
+/**
+ * drm_plane_init - Initialize a legacy plane
+ * @dev: DRM device
+ * @plane: plane object to init
+ * @possible_crtcs: bitmask of possible CRTCs
+ * @funcs: callbacks for the new plane
+ * @formats: array of supported formats (%DRM_FORMAT_*)
+ * @format_count: number of elements in @formats
+ * @is_primary: plane type (primary vs overlay)
+ *
+ * Legacy API to initialize a DRM plane.
+ *
+ * New drivers should call drm_universal_plane_init() instead.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_plane_init(struct drm_device *dev, struct drm_plane *plane,
+		   unsigned long possible_crtcs,
+		   const struct drm_plane_funcs *funcs,
+		   const uint32_t *formats, uint32_t format_count,
+		   bool is_primary)
+{
+	enum drm_plane_type type;
+
+	type = is_primary ? DRM_PLANE_TYPE_PRIMARY : DRM_PLANE_TYPE_OVERLAY;
+	return drm_universal_plane_init(dev, plane, possible_crtcs, funcs,
+					formats, format_count, type);
+}
+EXPORT_SYMBOL(drm_plane_init);
+
+/**
+ * drm_plane_cleanup - Clean up the core plane usage
+ * @plane: plane to cleanup
+ *
+ * This function cleans up @plane and removes it from the DRM mode setting
+ * core. Note that the function does *not* free the plane structure itself,
+ * this is the responsibility of the caller.
+ */
+void drm_plane_cleanup(struct drm_plane *plane)
+{
+	struct drm_device *dev = plane->dev;
+
+	drm_modeset_lock_all(dev);
+	kfree(plane->format_types);
+	drm_mode_object_put(dev, &plane->base);
+
+	BUG_ON(list_empty(&plane->head));
+
+	list_del(&plane->head);
+	dev->mode_config.num_total_plane--;
+	if (plane->type == DRM_PLANE_TYPE_OVERLAY)
+		dev->mode_config.num_overlay_plane--;
+	drm_modeset_unlock_all(dev);
+
+	WARN_ON(plane->state && !plane->funcs->atomic_destroy_state);
+	if (plane->state && plane->funcs->atomic_destroy_state)
+		plane->funcs->atomic_destroy_state(plane, plane->state);
+
+	memset(plane, 0, sizeof(*plane));
+}
+EXPORT_SYMBOL(drm_plane_cleanup);
+
+/**
+ * drm_plane_index - find the index of a registered plane
+ * @plane: plane to find index for
+ *
+ * Given a registered plane, return the index of that CRTC within a DRM
+ * device's list of planes.
+ */
+unsigned int drm_plane_index(struct drm_plane *plane)
+{
+	unsigned int index = 0;
+	struct drm_plane *tmp;
+
+	list_for_each_entry(tmp, &plane->dev->mode_config.plane_list, head) {
+		if (tmp == plane)
+			return index;
+
+		index++;
+	}
+
+	BUG();
+}
+EXPORT_SYMBOL(drm_plane_index);
+
+/**
+ * drm_plane_force_disable - Forcibly disable a plane
+ * @plane: plane to disable
+ *
+ * Forces the plane to be disabled.
+ *
+ * Used when the plane's current framebuffer is destroyed,
+ * and when restoring fbdev mode.
+ */
+void drm_plane_force_disable(struct drm_plane *plane)
+{
+	int ret;
+
+	if (!plane->fb)
+		return;
+
+	plane->old_fb = plane->fb;
+	ret = plane->funcs->disable_plane(plane);
+	if (ret) {
+		DRM_ERROR("failed to disable plane with busy fb\n");
+		plane->old_fb = NULL;
+		return;
+	}
+	/* disconnect the plane from the fb and crtc: */
+	drm_framebuffer_unreference(plane->old_fb);
+	plane->old_fb = NULL;
+	plane->fb = NULL;
+	plane->crtc = NULL;
+}
+EXPORT_SYMBOL(drm_plane_force_disable);
+
+static int drm_mode_create_standard_properties(struct drm_device *dev)
+{
+	struct drm_property *prop;
+
+	/*
+	 * Standard properties (apply to all connectors)
+	 */
+	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB |
+				   DRM_MODE_PROP_IMMUTABLE,
+				   "EDID", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.edid_property = prop;
+
+	prop = drm_property_create_enum(dev, 0,
+				   "DPMS", drm_dpms_enum_list,
+				   ARRAY_SIZE(drm_dpms_enum_list));
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.dpms_property = prop;
+
+	prop = drm_property_create(dev,
+				   DRM_MODE_PROP_BLOB |
+				   DRM_MODE_PROP_IMMUTABLE,
+				   "PATH", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.path_property = prop;
+
+	prop = drm_property_create(dev,
+				   DRM_MODE_PROP_BLOB |
+				   DRM_MODE_PROP_IMMUTABLE,
+				   "TILE", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.tile_property = prop;
+
+	prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
+					"type", drm_plane_type_enum_list,
+					ARRAY_SIZE(drm_plane_type_enum_list));
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.plane_type_property = prop;
+
+	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+			"SRC_X", 0, UINT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_src_x = prop;
+
+	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+			"SRC_Y", 0, UINT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_src_y = prop;
+
+	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+			"SRC_W", 0, UINT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_src_w = prop;
+
+	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+			"SRC_H", 0, UINT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_src_h = prop;
+
+	prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
+			"CRTC_X", INT_MIN, INT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_crtc_x = prop;
+
+	prop = drm_property_create_signed_range(dev, DRM_MODE_PROP_ATOMIC,
+			"CRTC_Y", INT_MIN, INT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_crtc_y = prop;
+
+	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+			"CRTC_W", 0, INT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_crtc_w = prop;
+
+	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+			"CRTC_H", 0, INT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_crtc_h = prop;
+
+	prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
+			"FB_ID", DRM_MODE_OBJECT_FB);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_fb_id = prop;
+
+	prop = drm_property_create_object(dev, DRM_MODE_PROP_ATOMIC,
+			"CRTC_ID", DRM_MODE_OBJECT_CRTC);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_crtc_id = prop;
+
+	prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
+			"ACTIVE");
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_active = prop;
+
+	return 0;
+}
+
+/**
+ * drm_mode_create_dvi_i_properties - create DVI-I specific connector properties
+ * @dev: DRM device
+ *
+ * Called by a driver the first time a DVI-I connector is made.
+ */
+int drm_mode_create_dvi_i_properties(struct drm_device *dev)
+{
+	struct drm_property *dvi_i_selector;
+	struct drm_property *dvi_i_subconnector;
+
+	if (dev->mode_config.dvi_i_select_subconnector_property)
+		return 0;
+
+	dvi_i_selector =
+		drm_property_create_enum(dev, 0,
+				    "select subconnector",
+				    drm_dvi_i_select_enum_list,
+				    ARRAY_SIZE(drm_dvi_i_select_enum_list));
+	dev->mode_config.dvi_i_select_subconnector_property = dvi_i_selector;
+
+	dvi_i_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
+				    "subconnector",
+				    drm_dvi_i_subconnector_enum_list,
+				    ARRAY_SIZE(drm_dvi_i_subconnector_enum_list));
+	dev->mode_config.dvi_i_subconnector_property = dvi_i_subconnector;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);
+
+/**
+ * drm_create_tv_properties - create TV specific connector properties
+ * @dev: DRM device
+ * @num_modes: number of different TV formats (modes) supported
+ * @modes: array of pointers to strings containing name of each format
+ *
+ * Called by a driver's TV initialization routine, this function creates
+ * the TV specific connector properties for a given device.  Caller is
+ * responsible for allocating a list of format names and passing them to
+ * this routine.
+ */
+int drm_mode_create_tv_properties(struct drm_device *dev,
+				  unsigned int num_modes,
+				  char *modes[])
+{
+	struct drm_property *tv_selector;
+	struct drm_property *tv_subconnector;
+	unsigned int i;
+
+	if (dev->mode_config.tv_select_subconnector_property)
+		return 0;
+
+	/*
+	 * Basic connector properties
+	 */
+	tv_selector = drm_property_create_enum(dev, 0,
+					  "select subconnector",
+					  drm_tv_select_enum_list,
+					  ARRAY_SIZE(drm_tv_select_enum_list));
+	dev->mode_config.tv_select_subconnector_property = tv_selector;
+
+	tv_subconnector =
+		drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
+				    "subconnector",
+				    drm_tv_subconnector_enum_list,
+				    ARRAY_SIZE(drm_tv_subconnector_enum_list));
+	dev->mode_config.tv_subconnector_property = tv_subconnector;
+
+	/*
+	 * Other, TV specific properties: margins & TV modes.
+	 */
+	dev->mode_config.tv_left_margin_property =
+		drm_property_create_range(dev, 0, "left margin", 0, 100);
+
+	dev->mode_config.tv_right_margin_property =
+		drm_property_create_range(dev, 0, "right margin", 0, 100);
+
+	dev->mode_config.tv_top_margin_property =
+		drm_property_create_range(dev, 0, "top margin", 0, 100);
+
+	dev->mode_config.tv_bottom_margin_property =
+		drm_property_create_range(dev, 0, "bottom margin", 0, 100);
+
+	dev->mode_config.tv_mode_property =
+		drm_property_create(dev, DRM_MODE_PROP_ENUM,
+				    "mode", num_modes);
+	for (i = 0; i < num_modes; i++)
+		drm_property_add_enum(dev->mode_config.tv_mode_property, i,
+				      i, modes[i]);
+
+	dev->mode_config.tv_brightness_property =
+		drm_property_create_range(dev, 0, "brightness", 0, 100);
+
+	dev->mode_config.tv_contrast_property =
+		drm_property_create_range(dev, 0, "contrast", 0, 100);
+
+	dev->mode_config.tv_flicker_reduction_property =
+		drm_property_create_range(dev, 0, "flicker reduction", 0, 100);
+
+	dev->mode_config.tv_overscan_property =
+		drm_property_create_range(dev, 0, "overscan", 0, 100);
+
+	dev->mode_config.tv_saturation_property =
+		drm_property_create_range(dev, 0, "saturation", 0, 100);
+
+	dev->mode_config.tv_hue_property =
+		drm_property_create_range(dev, 0, "hue", 0, 100);
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_tv_properties);
+
+/**
+ * drm_mode_create_scaling_mode_property - create scaling mode property
+ * @dev: DRM device
+ *
+ * Called by a driver the first time it's needed, must be attached to desired
+ * connectors.
+ */
+int drm_mode_create_scaling_mode_property(struct drm_device *dev)
+{
+	struct drm_property *scaling_mode;
+
+	if (dev->mode_config.scaling_mode_property)
+		return 0;
+
+	scaling_mode =
+		drm_property_create_enum(dev, 0, "scaling mode",
+				drm_scaling_mode_enum_list,
+				    ARRAY_SIZE(drm_scaling_mode_enum_list));
+
+	dev->mode_config.scaling_mode_property = scaling_mode;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
+
+/**
+ * drm_mode_create_aspect_ratio_property - create aspect ratio property
+ * @dev: DRM device
+ *
+ * Called by a driver the first time it's needed, must be attached to desired
+ * connectors.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
+{
+	if (dev->mode_config.aspect_ratio_property)
+		return 0;
+
+	dev->mode_config.aspect_ratio_property =
+		drm_property_create_enum(dev, 0, "aspect ratio",
+				drm_aspect_ratio_enum_list,
+				ARRAY_SIZE(drm_aspect_ratio_enum_list));
+
+	if (dev->mode_config.aspect_ratio_property == NULL)
+		return -ENOMEM;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);
+
+/**
+ * drm_mode_create_dirty_property - create dirty property
+ * @dev: DRM device
+ *
+ * Called by a driver the first time it's needed, must be attached to desired
+ * connectors.
+ */
+int drm_mode_create_dirty_info_property(struct drm_device *dev)
+{
+	struct drm_property *dirty_info;
+
+	if (dev->mode_config.dirty_info_property)
+		return 0;
+
+	dirty_info =
+		drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
+				    "dirty",
+				    drm_dirty_info_enum_list,
+				    ARRAY_SIZE(drm_dirty_info_enum_list));
+	dev->mode_config.dirty_info_property = dirty_info;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_dirty_info_property);
+
+/**
+ * drm_mode_create_suggested_offset_properties - create suggests offset properties
+ * @dev: DRM device
+ *
+ * Create the the suggested x/y offset property for connectors.
+ */
+int drm_mode_create_suggested_offset_properties(struct drm_device *dev)
+{
+	if (dev->mode_config.suggested_x_property && dev->mode_config.suggested_y_property)
+		return 0;
+
+	dev->mode_config.suggested_x_property =
+		drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested X", 0, 0xffffffff);
+
+	dev->mode_config.suggested_y_property =
+		drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested Y", 0, 0xffffffff);
+
+	if (dev->mode_config.suggested_x_property == NULL ||
+	    dev->mode_config.suggested_y_property == NULL)
+		return -ENOMEM;
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties);
+
+static int drm_mode_group_init(struct drm_device *dev, struct drm_mode_group *group)
+{
+	uint32_t total_objects = 0;
+
+	total_objects += dev->mode_config.num_crtc;
+	total_objects += dev->mode_config.num_connector;
+	total_objects += dev->mode_config.num_encoder;
+
+	group->id_list = kcalloc(total_objects, sizeof(uint32_t), GFP_KERNEL);
+	if (!group->id_list)
+		return -ENOMEM;
+
+	group->num_crtcs = 0;
+	group->num_connectors = 0;
+	group->num_encoders = 0;
+	return 0;
+}
+
+void drm_mode_group_destroy(struct drm_mode_group *group)
+{
+	kfree(group->id_list);
+	group->id_list = NULL;
+}
+
+/*
+ * NOTE: Driver's shouldn't ever call drm_mode_group_init_legacy_group - it is
+ * the drm core's responsibility to set up mode control groups.
+ */
+int drm_mode_group_init_legacy_group(struct drm_device *dev,
+				     struct drm_mode_group *group)
+{
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	int ret;
+
+	ret = drm_mode_group_init(dev, group);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+		group->id_list[group->num_crtcs++] = crtc->base.id;
+
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
+		group->id_list[group->num_crtcs + group->num_encoders++] =
+		encoder->base.id;
+
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+		group->id_list[group->num_crtcs + group->num_encoders +
+			       group->num_connectors++] = connector->base.id;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_group_init_legacy_group);
+
+void drm_reinit_primary_mode_group(struct drm_device *dev)
+{
+	drm_modeset_lock_all(dev);
+	drm_mode_group_destroy(&dev->primary->mode_group);
+	drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
+	drm_modeset_unlock_all(dev);
+}
+EXPORT_SYMBOL(drm_reinit_primary_mode_group);
+
+/**
+ * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
+ * @out: drm_mode_modeinfo struct to return to the user
+ * @in: drm_display_mode to use
+ *
+ * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
+ * the user.
+ */
+static void drm_crtc_convert_to_umode(struct drm_mode_modeinfo *out,
+				      const struct drm_display_mode *in)
+{
+	WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
+	     in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
+	     in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
+	     in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
+	     in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
+	     "timing values too large for mode info\n");
+
+	out->clock = in->clock;
+	out->hdisplay = in->hdisplay;
+	out->hsync_start = in->hsync_start;
+	out->hsync_end = in->hsync_end;
+	out->htotal = in->htotal;
+	out->hskew = in->hskew;
+	out->vdisplay = in->vdisplay;
+	out->vsync_start = in->vsync_start;
+	out->vsync_end = in->vsync_end;
+	out->vtotal = in->vtotal;
+	out->vscan = in->vscan;
+	out->vrefresh = in->vrefresh;
+	out->flags = in->flags;
+	out->type = in->type;
+	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
+	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
+}
+
+/**
+ * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
+ * @out: drm_display_mode to return to the user
+ * @in: drm_mode_modeinfo to use
+ *
+ * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
+ * the caller.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+static int drm_crtc_convert_umode(struct drm_display_mode *out,
+				  const struct drm_mode_modeinfo *in)
+{
+	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
+		return -ERANGE;
+
+	if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
+		return -EINVAL;
+
+	out->clock = in->clock;
+	out->hdisplay = in->hdisplay;
+	out->hsync_start = in->hsync_start;
+	out->hsync_end = in->hsync_end;
+	out->htotal = in->htotal;
+	out->hskew = in->hskew;
+	out->vdisplay = in->vdisplay;
+	out->vsync_start = in->vsync_start;
+	out->vsync_end = in->vsync_end;
+	out->vtotal = in->vtotal;
+	out->vscan = in->vscan;
+	out->vrefresh = in->vrefresh;
+	out->flags = in->flags;
+	out->type = in->type;
+	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
+	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
+
+	return 0;
+}
+
+/**
+ * drm_mode_getresources - get graphics configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Construct a set of configuration description structures and return
+ * them to the user, including CRTC, connector and framebuffer configuration.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getresources(struct drm_device *dev, void *data,
+			  struct drm_file *file_priv)
+{
+	struct drm_mode_card_res *card_res = data;
+	struct list_head *lh;
+	struct drm_framebuffer *fb;
+	struct drm_connector *connector;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	int ret = 0;
+	int connector_count = 0;
+	int crtc_count = 0;
+	int fb_count = 0;
+	int encoder_count = 0;
+	int copied = 0, i;
+	uint32_t __user *fb_id;
+	uint32_t __user *crtc_id;
+	uint32_t __user *connector_id;
+	uint32_t __user *encoder_id;
+	struct drm_mode_group *mode_group;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+
+	mutex_lock(&file_priv->fbs_lock);
+	/*
+	 * For the non-control nodes we need to limit the list of resources
+	 * by IDs in the group list for this node
+	 */
+	list_for_each(lh, &file_priv->fbs)
+		fb_count++;
+
+	/* handle this in 4 parts */
+	/* FBs */
+	if (card_res->count_fbs >= fb_count) {
+		copied = 0;
+		fb_id = (uint32_t __user *)(unsigned long)card_res->fb_id_ptr;
+		list_for_each_entry(fb, &file_priv->fbs, filp_head) {
+			if (put_user(fb->base.id, fb_id + copied)) {
+				mutex_unlock(&file_priv->fbs_lock);
+				return -EFAULT;
+			}
+			copied++;
+		}
+	}
+	card_res->count_fbs = fb_count;
+	mutex_unlock(&file_priv->fbs_lock);
+
+	/* mode_config.mutex protects the connector list against e.g. DP MST
+	 * connector hot-adding. CRTC/Plane lists are invariant. */
+	mutex_lock(&dev->mode_config.mutex);
+	if (!drm_is_primary_client(file_priv)) {
+
+		mode_group = NULL;
+		list_for_each(lh, &dev->mode_config.crtc_list)
+			crtc_count++;
+
+		list_for_each(lh, &dev->mode_config.connector_list)
+			connector_count++;
+
+		list_for_each(lh, &dev->mode_config.encoder_list)
+			encoder_count++;
+	} else {
+
+		mode_group = &file_priv->master->minor->mode_group;
+		crtc_count = mode_group->num_crtcs;
+		connector_count = mode_group->num_connectors;
+		encoder_count = mode_group->num_encoders;
+	}
+
+	card_res->max_height = dev->mode_config.max_height;
+	card_res->min_height = dev->mode_config.min_height;
+	card_res->max_width = dev->mode_config.max_width;
+	card_res->min_width = dev->mode_config.min_width;
+
+	/* CRTCs */
+	if (card_res->count_crtcs >= crtc_count) {
+		copied = 0;
+		crtc_id = (uint32_t __user *)(unsigned long)card_res->crtc_id_ptr;
+		if (!mode_group) {
+			list_for_each_entry(crtc, &dev->mode_config.crtc_list,
+					    head) {
+				DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
+				if (put_user(crtc->base.id, crtc_id + copied)) {
+					ret = -EFAULT;
+					goto out;
+				}
+				copied++;
+			}
+		} else {
+			for (i = 0; i < mode_group->num_crtcs; i++) {
+				if (put_user(mode_group->id_list[i],
+					     crtc_id + copied)) {
+					ret = -EFAULT;
+					goto out;
+				}
+				copied++;
+			}
+		}
+	}
+	card_res->count_crtcs = crtc_count;
+
+	/* Encoders */
+	if (card_res->count_encoders >= encoder_count) {
+		copied = 0;
+		encoder_id = (uint32_t __user *)(unsigned long)card_res->encoder_id_ptr;
+		if (!mode_group) {
+			list_for_each_entry(encoder,
+					    &dev->mode_config.encoder_list,
+					    head) {
+				DRM_DEBUG_KMS("[ENCODER:%d:%s]\n", encoder->base.id,
+						encoder->name);
+				if (put_user(encoder->base.id, encoder_id +
+					     copied)) {
+					ret = -EFAULT;
+					goto out;
+				}
+				copied++;
+			}
+		} else {
+			for (i = mode_group->num_crtcs; i < mode_group->num_crtcs + mode_group->num_encoders; i++) {
+				if (put_user(mode_group->id_list[i],
+					     encoder_id + copied)) {
+					ret = -EFAULT;
+					goto out;
+				}
+				copied++;
+			}
+
+		}
+	}
+	card_res->count_encoders = encoder_count;
+
+	/* Connectors */
+	if (card_res->count_connectors >= connector_count) {
+		copied = 0;
+		connector_id = (uint32_t __user *)(unsigned long)card_res->connector_id_ptr;
+		if (!mode_group) {
+			list_for_each_entry(connector,
+					    &dev->mode_config.connector_list,
+					    head) {
+				DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
+					connector->base.id,
+					connector->name);
+				if (put_user(connector->base.id,
+					     connector_id + copied)) {
+					ret = -EFAULT;
+					goto out;
+				}
+				copied++;
+			}
+		} else {
+			int start = mode_group->num_crtcs +
+				mode_group->num_encoders;
+			for (i = start; i < start + mode_group->num_connectors; i++) {
+				if (put_user(mode_group->id_list[i],
+					     connector_id + copied)) {
+					ret = -EFAULT;
+					goto out;
+				}
+				copied++;
+			}
+		}
+	}
+	card_res->count_connectors = connector_count;
+
+	DRM_DEBUG_KMS("CRTC[%d] CONNECTORS[%d] ENCODERS[%d]\n", card_res->count_crtcs,
+		  card_res->count_connectors, card_res->count_encoders);
+
+out:
+	mutex_unlock(&dev->mode_config.mutex);
+	return ret;
+}
+
+/**
+ * drm_mode_getcrtc - get CRTC configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Construct a CRTC configuration structure to return to the user.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getcrtc(struct drm_device *dev,
+		     void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_crtc *crtc_resp = data;
+	struct drm_crtc *crtc;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	crtc = drm_crtc_find(dev, crtc_resp->crtc_id);
+	if (!crtc)
+		return -ENOENT;
+
+	drm_modeset_lock_crtc(crtc, crtc->primary);
+	crtc_resp->gamma_size = crtc->gamma_size;
+	if (crtc->primary->fb)
+		crtc_resp->fb_id = crtc->primary->fb->base.id;
+	else
+		crtc_resp->fb_id = 0;
+
+	if (crtc->state) {
+		crtc_resp->x = crtc->primary->state->src_x >> 16;
+		crtc_resp->y = crtc->primary->state->src_y >> 16;
+		if (crtc->state->enable) {
+			drm_crtc_convert_to_umode(&crtc_resp->mode, &crtc->state->mode);
+			crtc_resp->mode_valid = 1;
+
+		} else {
+			crtc_resp->mode_valid = 0;
+		}
+	} else {
+		crtc_resp->x = crtc->x;
+		crtc_resp->y = crtc->y;
+		if (crtc->enabled) {
+			drm_crtc_convert_to_umode(&crtc_resp->mode, &crtc->mode);
+			crtc_resp->mode_valid = 1;
+
+		} else {
+			crtc_resp->mode_valid = 0;
+		}
+	}
+	drm_modeset_unlock_crtc(crtc);
+
+	return 0;
+}
+
+static bool drm_mode_expose_to_userspace(const struct drm_display_mode *mode,
+					 const struct drm_file *file_priv)
+{
+	/*
+	 * If user-space hasn't configured the driver to expose the stereo 3D
+	 * modes, don't expose them.
+	 */
+	if (!file_priv->stereo_allowed && drm_mode_is_stereo(mode))
+		return false;
+
+	return true;
+}
+
+static struct drm_encoder *drm_connector_get_encoder(struct drm_connector *connector)
+{
+	/* For atomic drivers only state objects are synchronously updated and
+	 * protected by modeset locks, so check those first. */
+	if (connector->state)
+		return connector->state->best_encoder;
+	return connector->encoder;
+}
+
+/* helper for getconnector and getproperties ioctls */
+static int get_properties(struct drm_mode_object *obj, bool atomic,
+		uint32_t __user *prop_ptr, uint64_t __user *prop_values,
+		uint32_t *arg_count_props)
+{
+	int props_count;
+	int i, ret, copied;
+
+	props_count = obj->properties->count;
+	if (!atomic)
+		props_count -= obj->properties->atomic_count;
+
+	if ((*arg_count_props >= props_count) && props_count) {
+		for (i = 0, copied = 0; copied < props_count; i++) {
+			struct drm_property *prop = obj->properties->properties[i];
+			uint64_t val;
+
+			if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
+				continue;
+
+			ret = drm_object_property_get_value(obj, prop, &val);
+			if (ret)
+				return ret;
+
+			if (put_user(prop->base.id, prop_ptr + copied))
+				return -EFAULT;
+
+			if (put_user(val, prop_values + copied))
+				return -EFAULT;
+
+			copied++;
+		}
+	}
+	*arg_count_props = props_count;
+
+	return 0;
+}
+
+/**
+ * drm_mode_getconnector - get connector configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Construct a connector configuration structure to return to the user.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getconnector(struct drm_device *dev, void *data,
+			  struct drm_file *file_priv)
+{
+	struct drm_mode_get_connector *out_resp = data;
+	struct drm_connector *connector;
+	struct drm_encoder *encoder;
+	struct drm_display_mode *mode;
+	int mode_count = 0;
+	int encoders_count = 0;
+	int ret = 0;
+	int copied = 0;
+	int i;
+	struct drm_mode_modeinfo u_mode;
+	struct drm_mode_modeinfo __user *mode_ptr;
+	uint32_t __user *encoder_ptr;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));
+
+	DRM_DEBUG_KMS("[CONNECTOR:%d:?]\n", out_resp->connector_id);
+
+	mutex_lock(&dev->mode_config.mutex);
+
+	connector = drm_connector_find(dev, out_resp->connector_id);
+	if (!connector) {
+		ret = -ENOENT;
+		goto out_unlock;
+	}
+
+	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
+		if (connector->encoder_ids[i] != 0)
+			encoders_count++;
+
+	if (out_resp->count_modes == 0) {
+		connector->funcs->fill_modes(connector,
+					     dev->mode_config.max_width,
+					     dev->mode_config.max_height);
+	}
+
+	/* delayed so we get modes regardless of pre-fill_modes state */
+	list_for_each_entry(mode, &connector->modes, head)
+		if (drm_mode_expose_to_userspace(mode, file_priv))
+			mode_count++;
+
+	out_resp->connector_id = connector->base.id;
+	out_resp->connector_type = connector->connector_type;
+	out_resp->connector_type_id = connector->connector_type_id;
+	out_resp->mm_width = connector->display_info.width_mm;
+	out_resp->mm_height = connector->display_info.height_mm;
+	out_resp->subpixel = connector->display_info.subpixel_order;
+	out_resp->connection = connector->status;
+
+	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
+	encoder = drm_connector_get_encoder(connector);
+	if (encoder)
+		out_resp->encoder_id = encoder->base.id;
+	else
+		out_resp->encoder_id = 0;
+
+	/*
+	 * This ioctl is called twice, once to determine how much space is
+	 * needed, and the 2nd time to fill it.
+	 */
+	if ((out_resp->count_modes >= mode_count) && mode_count) {
+		copied = 0;
+		mode_ptr = (struct drm_mode_modeinfo __user *)(unsigned long)out_resp->modes_ptr;
+		list_for_each_entry(mode, &connector->modes, head) {
+			if (!drm_mode_expose_to_userspace(mode, file_priv))
+				continue;
+
+			drm_crtc_convert_to_umode(&u_mode, mode);
+			if (copy_to_user(mode_ptr + copied,
+					 &u_mode, sizeof(u_mode))) {
+				ret = -EFAULT;
+				goto out;
+			}
+			copied++;
+		}
+	}
+	out_resp->count_modes = mode_count;
+
+	ret = get_properties(&connector->base, file_priv->atomic,
+			(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
+			(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
+			&out_resp->count_props);
+	if (ret)
+		goto out;
+
+	if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
+		copied = 0;
+		encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
+		for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
+			if (connector->encoder_ids[i] != 0) {
+				if (put_user(connector->encoder_ids[i],
+					     encoder_ptr + copied)) {
+					ret = -EFAULT;
+					goto out;
+				}
+				copied++;
+			}
+		}
+	}
+	out_resp->count_encoders = encoders_count;
+
+out:
+	drm_modeset_unlock(&dev->mode_config.connection_mutex);
+
+out_unlock:
+	mutex_unlock(&dev->mode_config.mutex);
+
+	return ret;
+}
+
+static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder)
+{
+	struct drm_connector *connector;
+	struct drm_device *dev = encoder->dev;
+	bool uses_atomic = false;
+
+	/* For atomic drivers only state objects are synchronously updated and
+	 * protected by modeset locks, so check those first. */
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		if (!connector->state)
+			continue;
+
+		uses_atomic = true;
+
+		if (connector->state->best_encoder != encoder)
+			continue;
+
+		return connector->state->crtc;
+	}
+
+	/* Don't return stale data (e.g. pending async disable). */
+	if (uses_atomic)
+		return NULL;
+
+	return encoder->crtc;
+}
+
+/**
+ * drm_mode_getencoder - get encoder configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Construct a encoder configuration structure to return to the user.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getencoder(struct drm_device *dev, void *data,
+			struct drm_file *file_priv)
+{
+	struct drm_mode_get_encoder *enc_resp = data;
+	struct drm_encoder *encoder;
+	struct drm_crtc *crtc;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	encoder = drm_encoder_find(dev, enc_resp->encoder_id);
+	if (!encoder)
+		return -ENOENT;
+
+	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
+	crtc = drm_encoder_get_crtc(encoder);
+	if (crtc)
+		enc_resp->crtc_id = crtc->base.id;
+	else
+		enc_resp->crtc_id = 0;
+	drm_modeset_unlock(&dev->mode_config.connection_mutex);
+
+	enc_resp->encoder_type = encoder->encoder_type;
+	enc_resp->encoder_id = encoder->base.id;
+	enc_resp->possible_crtcs = encoder->possible_crtcs;
+	enc_resp->possible_clones = encoder->possible_clones;
+
+	return 0;
+}
+
+/**
+ * drm_mode_getplane_res - enumerate all plane resources
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * Construct a list of plane ids to return to the user.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getplane_res(struct drm_device *dev, void *data,
+			  struct drm_file *file_priv)
+{
+	struct drm_mode_get_plane_res *plane_resp = data;
+	struct drm_mode_config *config;
+	struct drm_plane *plane;
+	uint32_t __user *plane_ptr;
+	int copied = 0;
+	unsigned num_planes;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	config = &dev->mode_config;
+
+	if (file_priv->universal_planes)
+		num_planes = config->num_total_plane;
+	else
+		num_planes = config->num_overlay_plane;
+
+	/*
+	 * This ioctl is called twice, once to determine how much space is
+	 * needed, and the 2nd time to fill it.
+	 */
+	if (num_planes &&
+	    (plane_resp->count_planes >= num_planes)) {
+		plane_ptr = (uint32_t __user *)(unsigned long)plane_resp->plane_id_ptr;
+
+		/* Plane lists are invariant, no locking needed. */
+		list_for_each_entry(plane, &config->plane_list, head) {
+			/*
+			 * Unless userspace set the 'universal planes'
+			 * capability bit, only advertise overlays.
+			 */
+			if (plane->type != DRM_PLANE_TYPE_OVERLAY &&
+			    !file_priv->universal_planes)
+				continue;
+
+			if (put_user(plane->base.id, plane_ptr + copied))
+				return -EFAULT;
+			copied++;
+		}
+	}
+	plane_resp->count_planes = num_planes;
+
+	return 0;
+}
+
+/**
+ * drm_mode_getplane - get plane configuration
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * Construct a plane configuration structure to return to the user.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getplane(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv)
+{
+	struct drm_mode_get_plane *plane_resp = data;
+	struct drm_plane *plane;
+	uint32_t __user *format_ptr;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	plane = drm_plane_find(dev, plane_resp->plane_id);
+	if (!plane)
+		return -ENOENT;
+
+	drm_modeset_lock(&plane->mutex, NULL);
+	if (plane->crtc)
+		plane_resp->crtc_id = plane->crtc->base.id;
+	else
+		plane_resp->crtc_id = 0;
+
+	if (plane->fb)
+		plane_resp->fb_id = plane->fb->base.id;
+	else
+		plane_resp->fb_id = 0;
+	drm_modeset_unlock(&plane->mutex);
+
+	plane_resp->plane_id = plane->base.id;
+	plane_resp->possible_crtcs = plane->possible_crtcs;
+	plane_resp->gamma_size = 0;
+
+	/*
+	 * This ioctl is called twice, once to determine how much space is
+	 * needed, and the 2nd time to fill it.
+	 */
+	if (plane->format_count &&
+	    (plane_resp->count_format_types >= plane->format_count)) {
+		format_ptr = (uint32_t __user *)(unsigned long)plane_resp->format_type_ptr;
+		if (copy_to_user(format_ptr,
+				 plane->format_types,
+				 sizeof(uint32_t) * plane->format_count)) {
+			return -EFAULT;
+		}
+	}
+	plane_resp->count_format_types = plane->format_count;
+
+	return 0;
+}
+
+/**
+ * drm_plane_check_pixel_format - Check if the plane supports the pixel format
+ * @plane: plane to check for format support
+ * @format: the pixel format
+ *
+ * Returns:
+ * Zero of @plane has @format in its list of supported pixel formats, -EINVAL
+ * otherwise.
+ */
+int drm_plane_check_pixel_format(const struct drm_plane *plane, u32 format)
+{
+	unsigned int i;
+
+	for (i = 0; i < plane->format_count; i++) {
+		if (format == plane->format_types[i])
+			return 0;
+	}
+
+	return -EINVAL;
+}
+
+/*
+ * setplane_internal - setplane handler for internal callers
+ *
+ * Note that we assume an extra reference has already been taken on fb.  If the
+ * update fails, this reference will be dropped before return; if it succeeds,
+ * the previous framebuffer (if any) will be unreferenced instead.
+ *
+ * src_{x,y,w,h} are provided in 16.16 fixed point format
+ */
+static int __setplane_internal(struct drm_plane *plane,
+			       struct drm_crtc *crtc,
+			       struct drm_framebuffer *fb,
+			       int32_t crtc_x, int32_t crtc_y,
+			       uint32_t crtc_w, uint32_t crtc_h,
+			       /* src_{x,y,w,h} values are 16.16 fixed point */
+			       uint32_t src_x, uint32_t src_y,
+			       uint32_t src_w, uint32_t src_h)
+{
+	int ret = 0;
+	unsigned int fb_width, fb_height;
+
+	/* No fb means shut it down */
+	if (!fb) {
+		plane->old_fb = plane->fb;
+		ret = plane->funcs->disable_plane(plane);
+		if (!ret) {
+			plane->crtc = NULL;
+			plane->fb = NULL;
+		} else {
+			plane->old_fb = NULL;
+		}
+		goto out;
+	}
+
+	/* Check whether this plane is usable on this CRTC */
+	if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
+		DRM_DEBUG_KMS("Invalid crtc for plane\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Check whether this plane supports the fb pixel format. */
+	ret = drm_plane_check_pixel_format(plane, fb->pixel_format);
+	if (ret) {
+		DRM_DEBUG_KMS("Invalid pixel format %s\n",
+			      drm_get_format_name(fb->pixel_format));
+		goto out;
+	}
+
+	/* Give drivers some help against integer overflows */
+	if (crtc_w > INT_MAX ||
+	    crtc_x > INT_MAX - (int32_t) crtc_w ||
+	    crtc_h > INT_MAX ||
+	    crtc_y > INT_MAX - (int32_t) crtc_h) {
+		DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n",
+			      crtc_w, crtc_h, crtc_x, crtc_y);
+		return -ERANGE;
+	}
+
+
+	fb_width = fb->width << 16;
+	fb_height = fb->height << 16;
+
+	/* Make sure source coordinates are inside the fb. */
+	if (src_w > fb_width ||
+	    src_x > fb_width - src_w ||
+	    src_h > fb_height ||
+	    src_y > fb_height - src_h) {
+		DRM_DEBUG_KMS("Invalid source coordinates "
+			      "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
+			      src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
+			      src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
+			      src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
+			      src_y >> 16, ((src_y & 0xffff) * 15625) >> 10);
+		ret = -ENOSPC;
+		goto out;
+	}
+
+	plane->old_fb = plane->fb;
+	ret = plane->funcs->update_plane(plane, crtc, fb,
+					 crtc_x, crtc_y, crtc_w, crtc_h,
+					 src_x, src_y, src_w, src_h);
+	if (!ret) {
+		plane->crtc = crtc;
+		plane->fb = fb;
+		fb = NULL;
+	} else {
+		plane->old_fb = NULL;
+	}
+
+out:
+	if (fb)
+		drm_framebuffer_unreference(fb);
+	if (plane->old_fb)
+		drm_framebuffer_unreference(plane->old_fb);
+	plane->old_fb = NULL;
+
+	return ret;
+}
+
+static int setplane_internal(struct drm_plane *plane,
+			     struct drm_crtc *crtc,
+			     struct drm_framebuffer *fb,
+			     int32_t crtc_x, int32_t crtc_y,
+			     uint32_t crtc_w, uint32_t crtc_h,
+			     /* src_{x,y,w,h} values are 16.16 fixed point */
+			     uint32_t src_x, uint32_t src_y,
+			     uint32_t src_w, uint32_t src_h)
+{
+	int ret;
+
+	drm_modeset_lock_all(plane->dev);
+	ret = __setplane_internal(plane, crtc, fb,
+				  crtc_x, crtc_y, crtc_w, crtc_h,
+				  src_x, src_y, src_w, src_h);
+	drm_modeset_unlock_all(plane->dev);
+
+	return ret;
+}
+
+/**
+ * drm_mode_setplane - configure a plane's configuration
+ * @dev: DRM device
+ * @data: ioctl data*
+ * @file_priv: DRM file info
+ *
+ * Set plane configuration, including placement, fb, scaling, and other factors.
+ * Or pass a NULL fb to disable (planes may be disabled without providing a
+ * valid crtc).
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_setplane(struct drm_device *dev, void *data,
+		      struct drm_file *file_priv)
+{
+	struct drm_mode_set_plane *plane_req = data;
+	struct drm_plane *plane;
+	struct drm_crtc *crtc = NULL;
+	struct drm_framebuffer *fb = NULL;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	/*
+	 * First, find the plane, crtc, and fb objects.  If not available,
+	 * we don't bother to call the driver.
+	 */
+	plane = drm_plane_find(dev, plane_req->plane_id);
+	if (!plane) {
+		DRM_DEBUG_KMS("Unknown plane ID %d\n",
+			      plane_req->plane_id);
+		return -ENOENT;
+	}
+
+	if (plane_req->fb_id) {
+		fb = drm_framebuffer_lookup(dev, plane_req->fb_id);
+		if (!fb) {
+			DRM_DEBUG_KMS("Unknown framebuffer ID %d\n",
+				      plane_req->fb_id);
+			return -ENOENT;
+		}
+
+		crtc = drm_crtc_find(dev, plane_req->crtc_id);
+		if (!crtc) {
+			DRM_DEBUG_KMS("Unknown crtc ID %d\n",
+				      plane_req->crtc_id);
+			return -ENOENT;
+		}
+	}
+
+	/*
+	 * setplane_internal will take care of deref'ing either the old or new
+	 * framebuffer depending on success.
+	 */
+	return setplane_internal(plane, crtc, fb,
+				 plane_req->crtc_x, plane_req->crtc_y,
+				 plane_req->crtc_w, plane_req->crtc_h,
+				 plane_req->src_x, plane_req->src_y,
+				 plane_req->src_w, plane_req->src_h);
+}
+
+/**
+ * drm_mode_set_config_internal - helper to call ->set_config
+ * @set: modeset config to set
+ *
+ * This is a little helper to wrap internal calls to the ->set_config driver
+ * interface. The only thing it adds is correct refcounting dance.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_set_config_internal(struct drm_mode_set *set)
+{
+	struct drm_crtc *crtc = set->crtc;
+	struct drm_framebuffer *fb;
+	struct drm_crtc *tmp;
+	int ret;
+
+	/*
+	 * NOTE: ->set_config can also disable other crtcs (if we steal all
+	 * connectors from it), hence we need to refcount the fbs across all
+	 * crtcs. Atomic modeset will have saner semantics ...
+	 */
+	list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head)
+		tmp->primary->old_fb = tmp->primary->fb;
+
+	fb = set->fb;
+
+	ret = crtc->funcs->set_config(set);
+	if (ret == 0) {
+		crtc->primary->crtc = crtc;
+		crtc->primary->fb = fb;
+	}
+
+	list_for_each_entry(tmp, &crtc->dev->mode_config.crtc_list, head) {
+		if (tmp->primary->fb)
+			drm_framebuffer_reference(tmp->primary->fb);
+		if (tmp->primary->old_fb)
+			drm_framebuffer_unreference(tmp->primary->old_fb);
+		tmp->primary->old_fb = NULL;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_mode_set_config_internal);
+
+/**
+ * drm_crtc_get_hv_timing - Fetches hdisplay/vdisplay for given mode
+ * @mode: mode to query
+ * @hdisplay: hdisplay value to fill in
+ * @vdisplay: vdisplay value to fill in
+ *
+ * The vdisplay value will be doubled if the specified mode is a stereo mode of
+ * the appropriate layout.
+ */
+void drm_crtc_get_hv_timing(const struct drm_display_mode *mode,
+			    int *hdisplay, int *vdisplay)
+{
+	struct drm_display_mode adjusted;
+
+	drm_mode_copy(&adjusted, mode);
+	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
+	*hdisplay = adjusted.crtc_hdisplay;
+	*vdisplay = adjusted.crtc_vdisplay;
+}
+EXPORT_SYMBOL(drm_crtc_get_hv_timing);
+
+/**
+ * drm_crtc_check_viewport - Checks that a framebuffer is big enough for the
+ *     CRTC viewport
+ * @crtc: CRTC that framebuffer will be displayed on
+ * @x: x panning
+ * @y: y panning
+ * @mode: mode that framebuffer will be displayed under
+ * @fb: framebuffer to check size of
+ */
+int drm_crtc_check_viewport(const struct drm_crtc *crtc,
+			    int x, int y,
+			    const struct drm_display_mode *mode,
+			    const struct drm_framebuffer *fb)
+
+{
+	int hdisplay, vdisplay;
+
+	drm_crtc_get_hv_timing(mode, &hdisplay, &vdisplay);
+
+	if (crtc->invert_dimensions)
+		swap(hdisplay, vdisplay);
+
+	if (hdisplay > fb->width ||
+	    vdisplay > fb->height ||
+	    x > fb->width - hdisplay ||
+	    y > fb->height - vdisplay) {
+		DRM_DEBUG_KMS("Invalid fb size %ux%u for CRTC viewport %ux%u+%d+%d%s.\n",
+			      fb->width, fb->height, hdisplay, vdisplay, x, y,
+			      crtc->invert_dimensions ? " (inverted)" : "");
+		return -ENOSPC;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_crtc_check_viewport);
+
+/**
+ * drm_mode_setcrtc - set CRTC configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Build a new CRTC configuration based on user request.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_setcrtc(struct drm_device *dev, void *data,
+		     struct drm_file *file_priv)
+{
+	struct drm_mode_config *config = &dev->mode_config;
+	struct drm_mode_crtc *crtc_req = data;
+	struct drm_crtc *crtc;
+	struct drm_connector **connector_set = NULL, *connector;
+	struct drm_framebuffer *fb = NULL;
+	struct drm_display_mode *mode = NULL;
+	struct drm_mode_set set;
+	uint32_t __user *set_connectors_ptr;
+	int ret;
+	int i;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	/*
+	 * Universal plane src offsets are only 16.16, prevent havoc for
+	 * drivers using universal plane code internally.
+	 */
+	if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000)
+		return -ERANGE;
+
+	drm_modeset_lock_all(dev);
+	crtc = drm_crtc_find(dev, crtc_req->crtc_id);
+	if (!crtc) {
+		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_req->crtc_id);
+		ret = -ENOENT;
+		goto out;
+	}
+	DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
+
+	if (crtc_req->mode_valid) {
+		/* If we have a mode we need a framebuffer. */
+		/* If we pass -1, set the mode with the currently bound fb */
+		if (crtc_req->fb_id == -1) {
+			if (!crtc->primary->fb) {
+				DRM_DEBUG_KMS("CRTC doesn't have current FB\n");
+				ret = -EINVAL;
+				goto out;
+			}
+			fb = crtc->primary->fb;
+			/* Make refcounting symmetric with the lookup path. */
+			drm_framebuffer_reference(fb);
+		} else {
+			fb = drm_framebuffer_lookup(dev, crtc_req->fb_id);
+			if (!fb) {
+				DRM_DEBUG_KMS("Unknown FB ID%d\n",
+						crtc_req->fb_id);
+				ret = -ENOENT;
+				goto out;
+			}
+		}
+
+		mode = drm_mode_create(dev);
+		if (!mode) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		ret = drm_crtc_convert_umode(mode, &crtc_req->mode);
+		if (ret) {
+			DRM_DEBUG_KMS("Invalid mode\n");
+			goto out;
+		}
+
+		mode->status = drm_mode_validate_basic(mode);
+		if (mode->status != MODE_OK) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
+
+		/*
+		 * Check whether the primary plane supports the fb pixel format.
+		 * Drivers not implementing the universal planes API use a
+		 * default formats list provided by the DRM core which doesn't
+		 * match real hardware capabilities. Skip the check in that
+		 * case.
+		 */
+		if (!crtc->primary->format_default) {
+			ret = drm_plane_check_pixel_format(crtc->primary,
+							   fb->pixel_format);
+			if (ret) {
+				DRM_DEBUG_KMS("Invalid pixel format %s\n",
+					drm_get_format_name(fb->pixel_format));
+				goto out;
+			}
+		}
+
+		ret = drm_crtc_check_viewport(crtc, crtc_req->x, crtc_req->y,
+					      mode, fb);
+		if (ret)
+			goto out;
+
+	}
+
+	if (crtc_req->count_connectors == 0 && mode) {
+		DRM_DEBUG_KMS("Count connectors is 0 but mode set\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (crtc_req->count_connectors > 0 && (!mode || !fb)) {
+		DRM_DEBUG_KMS("Count connectors is %d but no mode or fb set\n",
+			  crtc_req->count_connectors);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (crtc_req->count_connectors > 0) {
+		u32 out_id;
+
+		/* Avoid unbounded kernel memory allocation */
+		if (crtc_req->count_connectors > config->num_connector) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		connector_set = kmalloc_array(crtc_req->count_connectors,
+					      sizeof(struct drm_connector *),
+					      GFP_KERNEL);
+		if (!connector_set) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		for (i = 0; i < crtc_req->count_connectors; i++) {
+			set_connectors_ptr = (uint32_t __user *)(unsigned long)crtc_req->set_connectors_ptr;
+			if (get_user(out_id, &set_connectors_ptr[i])) {
+				ret = -EFAULT;
+				goto out;
+			}
+
+			connector = drm_connector_find(dev, out_id);
+			if (!connector) {
+				DRM_DEBUG_KMS("Connector id %d unknown\n",
+						out_id);
+				ret = -ENOENT;
+				goto out;
+			}
+			DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
+					connector->base.id,
+					connector->name);
+
+			connector_set[i] = connector;
+		}
+	}
+
+	set.crtc = crtc;
+	set.x = crtc_req->x;
+	set.y = crtc_req->y;
+	set.mode = mode;
+	set.connectors = connector_set;
+	set.num_connectors = crtc_req->count_connectors;
+	set.fb = fb;
+	ret = drm_mode_set_config_internal(&set);
+
+out:
+	if (fb)
+		drm_framebuffer_unreference(fb);
+
+	kfree(connector_set);
+	drm_mode_destroy(dev, mode);
+	drm_modeset_unlock_all(dev);
+	return ret;
+}
+
+/**
+ * drm_mode_cursor_universal - translate legacy cursor ioctl call into a
+ *     universal plane handler call
+ * @crtc: crtc to update cursor for
+ * @req: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Legacy cursor ioctl's work directly with driver buffer handles.  To
+ * translate legacy ioctl calls into universal plane handler calls, we need to
+ * wrap the native buffer handle in a drm_framebuffer.
+ *
+ * Note that we assume any handle passed to the legacy ioctls was a 32-bit ARGB
+ * buffer with a pitch of 4*width; the universal plane interface should be used
+ * directly in cases where the hardware can support other buffer settings and
+ * userspace wants to make use of these capabilities.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+static int drm_mode_cursor_universal(struct drm_crtc *crtc,
+				     struct drm_mode_cursor2 *req,
+				     struct drm_file *file_priv)
+{
+	struct drm_device *dev = crtc->dev;
+	struct drm_framebuffer *fb = NULL;
+	struct drm_mode_fb_cmd2 fbreq = {
+		.width = req->width,
+		.height = req->height,
+		.pixel_format = DRM_FORMAT_ARGB8888,
+		.pitches = { req->width * 4 },
+		.handles = { req->handle },
+	};
+	int32_t crtc_x, crtc_y;
+	uint32_t crtc_w = 0, crtc_h = 0;
+	uint32_t src_w = 0, src_h = 0;
+	int ret = 0;
+
+	BUG_ON(!crtc->cursor);
+	WARN_ON(crtc->cursor->crtc != crtc && crtc->cursor->crtc != NULL);
+
+	/*
+	 * Obtain fb we'll be using (either new or existing) and take an extra
+	 * reference to it if fb != null.  setplane will take care of dropping
+	 * the reference if the plane update fails.
+	 */
+	if (req->flags & DRM_MODE_CURSOR_BO) {
+		if (req->handle) {
+			fb = internal_framebuffer_create(dev, &fbreq, file_priv);
+			if (IS_ERR(fb)) {
+				DRM_DEBUG_KMS("failed to wrap cursor buffer in drm framebuffer\n");
+				return PTR_ERR(fb);
+			}
+		} else {
+			fb = NULL;
+		}
+	} else {
+		fb = crtc->cursor->fb;
+		if (fb)
+			drm_framebuffer_reference(fb);
+	}
+
+	if (req->flags & DRM_MODE_CURSOR_MOVE) {
+		crtc_x = req->x;
+		crtc_y = req->y;
+	} else {
+		crtc_x = crtc->cursor_x;
+		crtc_y = crtc->cursor_y;
+	}
+
+	if (fb) {
+		crtc_w = fb->width;
+		crtc_h = fb->height;
+		src_w = fb->width << 16;
+		src_h = fb->height << 16;
+	}
+
+	/*
+	 * setplane_internal will take care of deref'ing either the old or new
+	 * framebuffer depending on success.
+	 */
+	ret = __setplane_internal(crtc->cursor, crtc, fb,
+				crtc_x, crtc_y, crtc_w, crtc_h,
+				0, 0, src_w, src_h);
+
+	/* Update successful; save new cursor position, if necessary */
+	if (ret == 0 && req->flags & DRM_MODE_CURSOR_MOVE) {
+		crtc->cursor_x = req->x;
+		crtc->cursor_y = req->y;
+	}
+
+	return ret;
+}
+
+static int drm_mode_cursor_common(struct drm_device *dev,
+				  struct drm_mode_cursor2 *req,
+				  struct drm_file *file_priv)
+{
+	struct drm_crtc *crtc;
+	int ret = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	if (!req->flags || (~DRM_MODE_CURSOR_FLAGS & req->flags))
+		return -EINVAL;
+
+	crtc = drm_crtc_find(dev, req->crtc_id);
+	if (!crtc) {
+		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", req->crtc_id);
+		return -ENOENT;
+	}
+
+	/*
+	 * If this crtc has a universal cursor plane, call that plane's update
+	 * handler rather than using legacy cursor handlers.
+	 */
+	drm_modeset_lock_crtc(crtc, crtc->cursor);
+	if (crtc->cursor) {
+		ret = drm_mode_cursor_universal(crtc, req, file_priv);
+		goto out;
+	}
+
+	if (req->flags & DRM_MODE_CURSOR_BO) {
+		if (!crtc->funcs->cursor_set && !crtc->funcs->cursor_set2) {
+			ret = -ENXIO;
+			goto out;
+		}
+		/* Turns off the cursor if handle is 0 */
+		if (crtc->funcs->cursor_set2)
+			ret = crtc->funcs->cursor_set2(crtc, file_priv, req->handle,
+						      req->width, req->height, req->hot_x, req->hot_y);
+		else
+			ret = crtc->funcs->cursor_set(crtc, file_priv, req->handle,
+						      req->width, req->height);
+	}
+
+	if (req->flags & DRM_MODE_CURSOR_MOVE) {
+		if (crtc->funcs->cursor_move) {
+			ret = crtc->funcs->cursor_move(crtc, req->x, req->y);
+		} else {
+			ret = -EFAULT;
+			goto out;
+		}
+	}
+out:
+	drm_modeset_unlock_crtc(crtc);
+
+	return ret;
+
+}
+
+
+/**
+ * drm_mode_cursor_ioctl - set CRTC's cursor configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Set the cursor configuration based on user request.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_cursor_ioctl(struct drm_device *dev,
+			  void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_cursor *req = data;
+	struct drm_mode_cursor2 new_req;
+
+	memcpy(&new_req, req, sizeof(struct drm_mode_cursor));
+	new_req.hot_x = new_req.hot_y = 0;
+
+	return drm_mode_cursor_common(dev, &new_req, file_priv);
+}
+
+/**
+ * drm_mode_cursor2_ioctl - set CRTC's cursor configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Set the cursor configuration based on user request. This implements the 2nd
+ * version of the cursor ioctl, which allows userspace to additionally specify
+ * the hotspot of the pointer.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_cursor2_ioctl(struct drm_device *dev,
+			   void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_cursor2 *req = data;
+
+	return drm_mode_cursor_common(dev, req, file_priv);
+}
+
+/**
+ * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
+ * @bpp: bits per pixels
+ * @depth: bit depth per pixel
+ *
+ * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
+ * Useful in fbdev emulation code, since that deals in those values.
+ */
+uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
+{
+	uint32_t fmt;
+
+	switch (bpp) {
+	case 8:
+		fmt = DRM_FORMAT_C8;
+		break;
+	case 16:
+		if (depth == 15)
+			fmt = DRM_FORMAT_XRGB1555;
+		else
+			fmt = DRM_FORMAT_RGB565;
+		break;
+	case 24:
+		fmt = DRM_FORMAT_RGB888;
+		break;
+	case 32:
+		if (depth == 24)
+			fmt = DRM_FORMAT_XRGB8888;
+		else if (depth == 30)
+			fmt = DRM_FORMAT_XRGB2101010;
+		else
+			fmt = DRM_FORMAT_ARGB8888;
+		break;
+	default:
+		DRM_ERROR("bad bpp, assuming x8r8g8b8 pixel format\n");
+		fmt = DRM_FORMAT_XRGB8888;
+		break;
+	}
+
+	return fmt;
+}
+EXPORT_SYMBOL(drm_mode_legacy_fb_format);
+
+/**
+ * drm_mode_addfb - add an FB to the graphics configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Add a new FB to the specified CRTC, given a user request. This is the
+ * original addfb ioctl which only supported RGB formats.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_addfb(struct drm_device *dev,
+		   void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_fb_cmd *or = data;
+	struct drm_mode_fb_cmd2 r = {};
+	int ret;
+
+	/* convert to new format and call new ioctl */
+	r.fb_id = or->fb_id;
+	r.width = or->width;
+	r.height = or->height;
+	r.pitches[0] = or->pitch;
+	r.pixel_format = drm_mode_legacy_fb_format(or->bpp, or->depth);
+	r.handles[0] = or->handle;
+
+	ret = drm_mode_addfb2(dev, &r, file_priv);
+	if (ret)
+		return ret;
+
+	or->fb_id = r.fb_id;
+
+	return 0;
+}
+
+static int format_check(const struct drm_mode_fb_cmd2 *r)
+{
+	uint32_t format = r->pixel_format & ~DRM_FORMAT_BIG_ENDIAN;
+
+	switch (format) {
+	case DRM_FORMAT_C8:
+	case DRM_FORMAT_RGB332:
+	case DRM_FORMAT_BGR233:
+	case DRM_FORMAT_XRGB4444:
+	case DRM_FORMAT_XBGR4444:
+	case DRM_FORMAT_RGBX4444:
+	case DRM_FORMAT_BGRX4444:
+	case DRM_FORMAT_ARGB4444:
+	case DRM_FORMAT_ABGR4444:
+	case DRM_FORMAT_RGBA4444:
+	case DRM_FORMAT_BGRA4444:
+	case DRM_FORMAT_XRGB1555:
+	case DRM_FORMAT_XBGR1555:
+	case DRM_FORMAT_RGBX5551:
+	case DRM_FORMAT_BGRX5551:
+	case DRM_FORMAT_ARGB1555:
+	case DRM_FORMAT_ABGR1555:
+	case DRM_FORMAT_RGBA5551:
+	case DRM_FORMAT_BGRA5551:
+	case DRM_FORMAT_RGB565:
+	case DRM_FORMAT_BGR565:
+	case DRM_FORMAT_RGB888:
+	case DRM_FORMAT_BGR888:
+	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_XBGR8888:
+	case DRM_FORMAT_RGBX8888:
+	case DRM_FORMAT_BGRX8888:
+	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_ABGR8888:
+	case DRM_FORMAT_RGBA8888:
+	case DRM_FORMAT_BGRA8888:
+	case DRM_FORMAT_XRGB2101010:
+	case DRM_FORMAT_XBGR2101010:
+	case DRM_FORMAT_RGBX1010102:
+	case DRM_FORMAT_BGRX1010102:
+	case DRM_FORMAT_ARGB2101010:
+	case DRM_FORMAT_ABGR2101010:
+	case DRM_FORMAT_RGBA1010102:
+	case DRM_FORMAT_BGRA1010102:
+	case DRM_FORMAT_YUYV:
+	case DRM_FORMAT_YVYU:
+	case DRM_FORMAT_UYVY:
+	case DRM_FORMAT_VYUY:
+	case DRM_FORMAT_AYUV:
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV16:
+	case DRM_FORMAT_NV61:
+	case DRM_FORMAT_NV24:
+	case DRM_FORMAT_NV42:
+	case DRM_FORMAT_YUV410:
+	case DRM_FORMAT_YVU410:
+	case DRM_FORMAT_YUV411:
+	case DRM_FORMAT_YVU411:
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+	case DRM_FORMAT_YUV422:
+	case DRM_FORMAT_YVU422:
+	case DRM_FORMAT_YUV444:
+	case DRM_FORMAT_YVU444:
+		return 0;
+	default:
+		DRM_DEBUG_KMS("invalid pixel format %s\n",
+			      drm_get_format_name(r->pixel_format));
+		return -EINVAL;
+	}
+}
+
+static int framebuffer_check(const struct drm_mode_fb_cmd2 *r)
+{
+	int ret, hsub, vsub, num_planes, i;
+
+	ret = format_check(r);
+	if (ret) {
+		DRM_DEBUG_KMS("bad framebuffer format %s\n",
+			      drm_get_format_name(r->pixel_format));
+		return ret;
+	}
+
+	hsub = drm_format_horz_chroma_subsampling(r->pixel_format);
+	vsub = drm_format_vert_chroma_subsampling(r->pixel_format);
+	num_planes = drm_format_num_planes(r->pixel_format);
+
+	if (r->width == 0 || r->width % hsub) {
+		DRM_DEBUG_KMS("bad framebuffer width %u\n", r->width);
+		return -EINVAL;
+	}
+
+	if (r->height == 0 || r->height % vsub) {
+		DRM_DEBUG_KMS("bad framebuffer height %u\n", r->height);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < num_planes; i++) {
+		unsigned int width = r->width / (i != 0 ? hsub : 1);
+		unsigned int height = r->height / (i != 0 ? vsub : 1);
+		unsigned int cpp = drm_format_plane_cpp(r->pixel_format, i);
+
+		if (!r->handles[i]) {
+			DRM_DEBUG_KMS("no buffer object handle for plane %d\n", i);
+			return -EINVAL;
+		}
+
+		if ((uint64_t) width * cpp > UINT_MAX)
+			return -ERANGE;
+
+		if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
+			return -ERANGE;
+
+		if (r->pitches[i] < width * cpp) {
+			DRM_DEBUG_KMS("bad pitch %u for plane %d\n", r->pitches[i], i);
+			return -EINVAL;
+		}
+
+		if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {
+			DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
+				      r->modifier[i], i);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static struct drm_framebuffer *
+internal_framebuffer_create(struct drm_device *dev,
+			    struct drm_mode_fb_cmd2 *r,
+			    struct drm_file *file_priv)
+{
+	struct drm_mode_config *config = &dev->mode_config;
+	struct drm_framebuffer *fb;
+	int ret;
+
+	if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
+		DRM_DEBUG_KMS("bad framebuffer flags 0x%08x\n", r->flags);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if ((config->min_width > r->width) || (r->width > config->max_width)) {
+		DRM_DEBUG_KMS("bad framebuffer width %d, should be >= %d && <= %d\n",
+			  r->width, config->min_width, config->max_width);
+		return ERR_PTR(-EINVAL);
+	}
+	if ((config->min_height > r->height) || (r->height > config->max_height)) {
+		DRM_DEBUG_KMS("bad framebuffer height %d, should be >= %d && <= %d\n",
+			  r->height, config->min_height, config->max_height);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (r->flags & DRM_MODE_FB_MODIFIERS &&
+	    !dev->mode_config.allow_fb_modifiers) {
+		DRM_DEBUG_KMS("driver does not support fb modifiers\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	ret = framebuffer_check(r);
+	if (ret)
+		return ERR_PTR(ret);
+
+	fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
+	if (IS_ERR(fb)) {
+		DRM_DEBUG_KMS("could not create framebuffer\n");
+		return fb;
+	}
+
+	return fb;
+}
+
+/**
+ * drm_mode_addfb2 - add an FB to the graphics configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Add a new FB to the specified CRTC, given a user request with format. This is
+ * the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
+ * and uses fourcc codes as pixel format specifiers.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_addfb2(struct drm_device *dev,
+		    void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_fb_cmd2 *r = data;
+	struct drm_framebuffer *fb;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	fb = internal_framebuffer_create(dev, r, file_priv);
+	if (IS_ERR(fb))
+		return PTR_ERR(fb);
+
+	/* Transfer ownership to the filp for reaping on close */
+
+	DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
+	mutex_lock(&file_priv->fbs_lock);
+	r->fb_id = fb->base.id;
+	list_add(&fb->filp_head, &file_priv->fbs);
+	mutex_unlock(&file_priv->fbs_lock);
+
+	return 0;
+}
+
+/**
+ * drm_mode_rmfb - remove an FB from the configuration
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Remove the FB specified by the user.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_rmfb(struct drm_device *dev,
+		   void *data, struct drm_file *file_priv)
+{
+	struct drm_framebuffer *fb = NULL;
+	struct drm_framebuffer *fbl = NULL;
+	uint32_t *id = data;
+	int found = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	mutex_lock(&file_priv->fbs_lock);
+	mutex_lock(&dev->mode_config.fb_lock);
+	fb = __drm_framebuffer_lookup(dev, *id);
+	if (!fb)
+		goto fail_lookup;
+
+	list_for_each_entry(fbl, &file_priv->fbs, filp_head)
+		if (fb == fbl)
+			found = 1;
+	if (!found)
+		goto fail_lookup;
+
+	/* Mark fb as reaped, we still have a ref from fpriv->fbs. */
+	__drm_framebuffer_unregister(dev, fb);
+
+	list_del_init(&fb->filp_head);
+	mutex_unlock(&dev->mode_config.fb_lock);
+	mutex_unlock(&file_priv->fbs_lock);
+
+	drm_framebuffer_remove(fb);
+
+	return 0;
+
+fail_lookup:
+	mutex_unlock(&dev->mode_config.fb_lock);
+	mutex_unlock(&file_priv->fbs_lock);
+
+	return -ENOENT;
+}
+
+/**
+ * drm_mode_getfb - get FB info
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Lookup the FB given its ID and return info about it.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getfb(struct drm_device *dev,
+		   void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_fb_cmd *r = data;
+	struct drm_framebuffer *fb;
+	int ret;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	fb = drm_framebuffer_lookup(dev, r->fb_id);
+	if (!fb)
+		return -ENOENT;
+
+	r->height = fb->height;
+	r->width = fb->width;
+	r->depth = fb->depth;
+	r->bpp = fb->bits_per_pixel;
+	r->pitch = fb->pitches[0];
+	if (fb->funcs->create_handle) {
+		if (file_priv->is_master || capable(CAP_SYS_ADMIN) ||
+		    drm_is_control_client(file_priv)) {
+			ret = fb->funcs->create_handle(fb, file_priv,
+						       &r->handle);
+		} else {
+			/* GET_FB() is an unprivileged ioctl so we must not
+			 * return a buffer-handle to non-master processes! For
+			 * backwards-compatibility reasons, we cannot make
+			 * GET_FB() privileged, so just return an invalid handle
+			 * for non-masters. */
+			r->handle = 0;
+			ret = 0;
+		}
+	} else {
+		ret = -ENODEV;
+	}
+
+	drm_framebuffer_unreference(fb);
+
+	return ret;
+}
+
+/**
+ * drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB
+ * @dev: drm device for the ioctl
+ * @data: data pointer for the ioctl
+ * @file_priv: drm file for the ioctl call
+ *
+ * Lookup the FB and flush out the damaged area supplied by userspace as a clip
+ * rectangle list. Generic userspace which does frontbuffer rendering must call
+ * this ioctl to flush out the changes on manual-update display outputs, e.g.
+ * usb display-link, mipi manual update panels or edp panel self refresh modes.
+ *
+ * Modesetting drivers which always update the frontbuffer do not need to
+ * implement the corresponding ->dirty framebuffer callback.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
+			   void *data, struct drm_file *file_priv)
+{
+	struct drm_clip_rect __user *clips_ptr;
+	struct drm_clip_rect *clips = NULL;
+	struct drm_mode_fb_dirty_cmd *r = data;
+	struct drm_framebuffer *fb;
+	unsigned flags;
+	int num_clips;
+	int ret;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	fb = drm_framebuffer_lookup(dev, r->fb_id);
+	if (!fb)
+		return -ENOENT;
+
+	num_clips = r->num_clips;
+	clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr;
+
+	if (!num_clips != !clips_ptr) {
+		ret = -EINVAL;
+		goto out_err1;
+	}
+
+	flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;
+
+	/* If userspace annotates copy, clips must come in pairs */
+	if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {
+		ret = -EINVAL;
+		goto out_err1;
+	}
+
+	if (num_clips && clips_ptr) {
+		if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) {
+			ret = -EINVAL;
+			goto out_err1;
+		}
+		clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
+		if (!clips) {
+			ret = -ENOMEM;
+			goto out_err1;
+		}
+
+		ret = copy_from_user(clips, clips_ptr,
+				     num_clips * sizeof(*clips));
+		if (ret) {
+			ret = -EFAULT;
+			goto out_err2;
+		}
+	}
+
+	if (fb->funcs->dirty) {
+		ret = fb->funcs->dirty(fb, file_priv, flags, r->color,
+				       clips, num_clips);
+	} else {
+		ret = -ENOSYS;
+	}
+
+out_err2:
+	kfree(clips);
+out_err1:
+	drm_framebuffer_unreference(fb);
+
+	return ret;
+}
+
+
+/**
+ * drm_fb_release - remove and free the FBs on this file
+ * @priv: drm file for the ioctl
+ *
+ * Destroy all the FBs associated with @filp.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+void drm_fb_release(struct drm_file *priv)
+{
+	struct drm_device *dev = priv->minor->dev;
+	struct drm_framebuffer *fb, *tfb;
+
+	/*
+	 * When the file gets released that means no one else can access the fb
+	 * list any more, so no need to grab fpriv->fbs_lock. And we need to
+	 * avoid upsetting lockdep since the universal cursor code adds a
+	 * framebuffer while holding mutex locks.
+	 *
+	 * Note that a real deadlock between fpriv->fbs_lock and the modeset
+	 * locks is impossible here since no one else but this function can get
+	 * at it any more.
+	 */
+	list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
+
+		mutex_lock(&dev->mode_config.fb_lock);
+		/* Mark fb as reaped, we still have a ref from fpriv->fbs. */
+		__drm_framebuffer_unregister(dev, fb);
+		mutex_unlock(&dev->mode_config.fb_lock);
+
+		list_del_init(&fb->filp_head);
+
+		/* This will also drop the fpriv->fbs reference. */
+		drm_framebuffer_remove(fb);
+	}
+}
+
+/**
+ * drm_property_create - create a new property type
+ * @dev: drm device
+ * @flags: flags specifying the property type
+ * @name: name of the property
+ * @num_values: number of pre-defined values
+ *
+ * This creates a new generic drm property which can then be attached to a drm
+ * object with drm_object_attach_property. The returned property object must be
+ * freed with drm_property_destroy.
+ *
+ * Note that the DRM core keeps a per-device list of properties and that, if
+ * drm_mode_config_cleanup() is called, it will destroy all properties created
+ * by the driver.
+ *
+ * Returns:
+ * A pointer to the newly created property on success, NULL on failure.
+ */
+struct drm_property *drm_property_create(struct drm_device *dev, int flags,
+					 const char *name, int num_values)
+{
+	struct drm_property *property = NULL;
+	int ret;
+
+	property = kzalloc(sizeof(struct drm_property), GFP_KERNEL);
+	if (!property)
+		return NULL;
+
+	property->dev = dev;
+
+	if (num_values) {
+		property->values = kcalloc(num_values, sizeof(uint64_t),
+					   GFP_KERNEL);
+		if (!property->values)
+			goto fail;
+	}
+
+	ret = drm_mode_object_get(dev, &property->base, DRM_MODE_OBJECT_PROPERTY);
+	if (ret)
+		goto fail;
+
+	property->flags = flags;
+	property->num_values = num_values;
+	INIT_LIST_HEAD(&property->enum_list);
+
+	if (name) {
+		strncpy(property->name, name, DRM_PROP_NAME_LEN);
+		property->name[DRM_PROP_NAME_LEN-1] = '\0';
+	}
+
+	list_add_tail(&property->head, &dev->mode_config.property_list);
+
+	WARN_ON(!drm_property_type_valid(property));
+
+	return property;
+fail:
+	kfree(property->values);
+	kfree(property);
+	return NULL;
+}
+EXPORT_SYMBOL(drm_property_create);
+
+/**
+ * drm_property_create_enum - create a new enumeration property type
+ * @dev: drm device
+ * @flags: flags specifying the property type
+ * @name: name of the property
+ * @props: enumeration lists with property values
+ * @num_values: number of pre-defined values
+ *
+ * This creates a new generic drm property which can then be attached to a drm
+ * object with drm_object_attach_property. The returned property object must be
+ * freed with drm_property_destroy.
+ *
+ * Userspace is only allowed to set one of the predefined values for enumeration
+ * properties.
+ *
+ * Returns:
+ * A pointer to the newly created property on success, NULL on failure.
+ */
+struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags,
+					 const char *name,
+					 const struct drm_prop_enum_list *props,
+					 int num_values)
+{
+	struct drm_property *property;
+	int i, ret;
+
+	flags |= DRM_MODE_PROP_ENUM;
+
+	property = drm_property_create(dev, flags, name, num_values);
+	if (!property)
+		return NULL;
+
+	for (i = 0; i < num_values; i++) {
+		ret = drm_property_add_enum(property, i,
+				      props[i].type,
+				      props[i].name);
+		if (ret) {
+			drm_property_destroy(dev, property);
+			return NULL;
+		}
+	}
+
+	return property;
+}
+EXPORT_SYMBOL(drm_property_create_enum);
+
+/**
+ * drm_property_create_bitmask - create a new bitmask property type
+ * @dev: drm device
+ * @flags: flags specifying the property type
+ * @name: name of the property
+ * @props: enumeration lists with property bitflags
+ * @num_props: size of the @props array
+ * @supported_bits: bitmask of all supported enumeration values
+ *
+ * This creates a new bitmask drm property which can then be attached to a drm
+ * object with drm_object_attach_property. The returned property object must be
+ * freed with drm_property_destroy.
+ *
+ * Compared to plain enumeration properties userspace is allowed to set any
+ * or'ed together combination of the predefined property bitflag values
+ *
+ * Returns:
+ * A pointer to the newly created property on success, NULL on failure.
+ */
+struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
+					 int flags, const char *name,
+					 const struct drm_prop_enum_list *props,
+					 int num_props,
+					 uint64_t supported_bits)
+{
+	struct drm_property *property;
+	int i, ret, index = 0;
+	int num_values = hweight64(supported_bits);
+
+	flags |= DRM_MODE_PROP_BITMASK;
+
+	property = drm_property_create(dev, flags, name, num_values);
+	if (!property)
+		return NULL;
+	for (i = 0; i < num_props; i++) {
+		if (!(supported_bits & (1ULL << props[i].type)))
+			continue;
+
+		if (WARN_ON(index >= num_values)) {
+			drm_property_destroy(dev, property);
+			return NULL;
+		}
+
+		ret = drm_property_add_enum(property, index++,
+				      props[i].type,
+				      props[i].name);
+		if (ret) {
+			drm_property_destroy(dev, property);
+			return NULL;
+		}
+	}
+
+	return property;
+}
+EXPORT_SYMBOL(drm_property_create_bitmask);
+
+static struct drm_property *property_create_range(struct drm_device *dev,
+					 int flags, const char *name,
+					 uint64_t min, uint64_t max)
+{
+	struct drm_property *property;
+
+	property = drm_property_create(dev, flags, name, 2);
+	if (!property)
+		return NULL;
+
+	property->values[0] = min;
+	property->values[1] = max;
+
+	return property;
+}
+
+/**
+ * drm_property_create_range - create a new unsigned ranged property type
+ * @dev: drm device
+ * @flags: flags specifying the property type
+ * @name: name of the property
+ * @min: minimum value of the property
+ * @max: maximum value of the property
+ *
+ * This creates a new generic drm property which can then be attached to a drm
+ * object with drm_object_attach_property. The returned property object must be
+ * freed with drm_property_destroy.
+ *
+ * Userspace is allowed to set any unsigned integer value in the (min, max)
+ * range inclusive.
+ *
+ * Returns:
+ * A pointer to the newly created property on success, NULL on failure.
+ */
+struct drm_property *drm_property_create_range(struct drm_device *dev, int flags,
+					 const char *name,
+					 uint64_t min, uint64_t max)
+{
+	return property_create_range(dev, DRM_MODE_PROP_RANGE | flags,
+			name, min, max);
+}
+EXPORT_SYMBOL(drm_property_create_range);
+
+/**
+ * drm_property_create_signed_range - create a new signed ranged property type
+ * @dev: drm device
+ * @flags: flags specifying the property type
+ * @name: name of the property
+ * @min: minimum value of the property
+ * @max: maximum value of the property
+ *
+ * This creates a new generic drm property which can then be attached to a drm
+ * object with drm_object_attach_property. The returned property object must be
+ * freed with drm_property_destroy.
+ *
+ * Userspace is allowed to set any signed integer value in the (min, max)
+ * range inclusive.
+ *
+ * Returns:
+ * A pointer to the newly created property on success, NULL on failure.
+ */
+struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
+					 int flags, const char *name,
+					 int64_t min, int64_t max)
+{
+	return property_create_range(dev, DRM_MODE_PROP_SIGNED_RANGE | flags,
+			name, I642U64(min), I642U64(max));
+}
+EXPORT_SYMBOL(drm_property_create_signed_range);
+
+/**
+ * drm_property_create_object - create a new object property type
+ * @dev: drm device
+ * @flags: flags specifying the property type
+ * @name: name of the property
+ * @type: object type from DRM_MODE_OBJECT_* defines
+ *
+ * This creates a new generic drm property which can then be attached to a drm
+ * object with drm_object_attach_property. The returned property object must be
+ * freed with drm_property_destroy.
+ *
+ * Userspace is only allowed to set this to any property value of the given
+ * @type. Only useful for atomic properties, which is enforced.
+ *
+ * Returns:
+ * A pointer to the newly created property on success, NULL on failure.
+ */
+struct drm_property *drm_property_create_object(struct drm_device *dev,
+					 int flags, const char *name, uint32_t type)
+{
+	struct drm_property *property;
+
+	flags |= DRM_MODE_PROP_OBJECT;
+
+	if (WARN_ON(!(flags & DRM_MODE_PROP_ATOMIC)))
+		return NULL;
+
+	property = drm_property_create(dev, flags, name, 1);
+	if (!property)
+		return NULL;
+
+	property->values[0] = type;
+
+	return property;
+}
+EXPORT_SYMBOL(drm_property_create_object);
+
+/**
+ * drm_property_create_bool - create a new boolean property type
+ * @dev: drm device
+ * @flags: flags specifying the property type
+ * @name: name of the property
+ *
+ * This creates a new generic drm property which can then be attached to a drm
+ * object with drm_object_attach_property. The returned property object must be
+ * freed with drm_property_destroy.
+ *
+ * This is implemented as a ranged property with only {0, 1} as valid values.
+ *
+ * Returns:
+ * A pointer to the newly created property on success, NULL on failure.
+ */
+struct drm_property *drm_property_create_bool(struct drm_device *dev, int flags,
+					 const char *name)
+{
+	return drm_property_create_range(dev, flags, name, 0, 1);
+}
+EXPORT_SYMBOL(drm_property_create_bool);
+
+/**
+ * drm_property_add_enum - add a possible value to an enumeration property
+ * @property: enumeration property to change
+ * @index: index of the new enumeration
+ * @value: value of the new enumeration
+ * @name: symbolic name of the new enumeration
+ *
+ * This functions adds enumerations to a property.
+ *
+ * It's use is deprecated, drivers should use one of the more specific helpers
+ * to directly create the property with all enumerations already attached.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_property_add_enum(struct drm_property *property, int index,
+			  uint64_t value, const char *name)
+{
+	struct drm_property_enum *prop_enum;
+
+	if (!(drm_property_type_is(property, DRM_MODE_PROP_ENUM) ||
+			drm_property_type_is(property, DRM_MODE_PROP_BITMASK)))
+		return -EINVAL;
+
+	/*
+	 * Bitmask enum properties have the additional constraint of values
+	 * from 0 to 63
+	 */
+	if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK) &&
+			(value > 63))
+		return -EINVAL;
+
+	if (!list_empty(&property->enum_list)) {
+		list_for_each_entry(prop_enum, &property->enum_list, head) {
+			if (prop_enum->value == value) {
+				strncpy(prop_enum->name, name, DRM_PROP_NAME_LEN);
+				prop_enum->name[DRM_PROP_NAME_LEN-1] = '\0';
+				return 0;
+			}
+		}
+	}
+
+	prop_enum = kzalloc(sizeof(struct drm_property_enum), GFP_KERNEL);
+	if (!prop_enum)
+		return -ENOMEM;
+
+	strncpy(prop_enum->name, name, DRM_PROP_NAME_LEN);
+	prop_enum->name[DRM_PROP_NAME_LEN-1] = '\0';
+	prop_enum->value = value;
+
+	property->values[index] = value;
+	list_add_tail(&prop_enum->head, &property->enum_list);
+	return 0;
+}
+EXPORT_SYMBOL(drm_property_add_enum);
+
+/**
+ * drm_property_destroy - destroy a drm property
+ * @dev: drm device
+ * @property: property to destry
+ *
+ * This function frees a property including any attached resources like
+ * enumeration values.
+ */
+void drm_property_destroy(struct drm_device *dev, struct drm_property *property)
+{
+	struct drm_property_enum *prop_enum, *pt;
+
+	list_for_each_entry_safe(prop_enum, pt, &property->enum_list, head) {
+		list_del(&prop_enum->head);
+		kfree(prop_enum);
+	}
+
+	if (property->num_values)
+		kfree(property->values);
+	drm_mode_object_put(dev, &property->base);
+	list_del(&property->head);
+	kfree(property);
+}
+EXPORT_SYMBOL(drm_property_destroy);
+
+/**
+ * drm_object_attach_property - attach a property to a modeset object
+ * @obj: drm modeset object
+ * @property: property to attach
+ * @init_val: initial value of the property
+ *
+ * This attaches the given property to the modeset object with the given initial
+ * value. Currently this function cannot fail since the properties are stored in
+ * a statically sized array.
+ */
+void drm_object_attach_property(struct drm_mode_object *obj,
+				struct drm_property *property,
+				uint64_t init_val)
+{
+	int count = obj->properties->count;
+
+	if (count == DRM_OBJECT_MAX_PROPERTY) {
+		WARN(1, "Failed to attach object property (type: 0x%x). Please "
+			"increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
+			"you see this message on the same object type.\n",
+			obj->type);
+		return;
+	}
+
+	obj->properties->properties[count] = property;
+	obj->properties->values[count] = init_val;
+	obj->properties->count++;
+	if (property->flags & DRM_MODE_PROP_ATOMIC)
+		obj->properties->atomic_count++;
+}
+EXPORT_SYMBOL(drm_object_attach_property);
+
+/**
+ * drm_object_property_set_value - set the value of a property
+ * @obj: drm mode object to set property value for
+ * @property: property to set
+ * @val: value the property should be set to
+ *
+ * This functions sets a given property on a given object. This function only
+ * changes the software state of the property, it does not call into the
+ * driver's ->set_property callback.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_object_property_set_value(struct drm_mode_object *obj,
+				  struct drm_property *property, uint64_t val)
+{
+	int i;
+
+	for (i = 0; i < obj->properties->count; i++) {
+		if (obj->properties->properties[i] == property) {
+			obj->properties->values[i] = val;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(drm_object_property_set_value);
+
+/**
+ * drm_object_property_get_value - retrieve the value of a property
+ * @obj: drm mode object to get property value from
+ * @property: property to retrieve
+ * @val: storage for the property value
+ *
+ * This function retrieves the softare state of the given property for the given
+ * property. Since there is no driver callback to retrieve the current property
+ * value this might be out of sync with the hardware, depending upon the driver
+ * and property.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_object_property_get_value(struct drm_mode_object *obj,
+				  struct drm_property *property, uint64_t *val)
+{
+	int i;
+
+	/* read-only properties bypass atomic mechanism and still store
+	 * their value in obj->properties->values[].. mostly to avoid
+	 * having to deal w/ EDID and similar props in atomic paths:
+	 */
+	if (drm_core_check_feature(property->dev, DRIVER_ATOMIC) &&
+			!(property->flags & DRM_MODE_PROP_IMMUTABLE))
+		return drm_atomic_get_property(obj, property, val);
+
+	for (i = 0; i < obj->properties->count; i++) {
+		if (obj->properties->properties[i] == property) {
+			*val = obj->properties->values[i];
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(drm_object_property_get_value);
+
+/**
+ * drm_mode_getproperty_ioctl - get the property metadata
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This function retrieves the metadata for a given property, like the different
+ * possible values for an enum property or the limits for a range property.
+ *
+ * Blob properties are special
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getproperty_ioctl(struct drm_device *dev,
+			       void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_get_property *out_resp = data;
+	struct drm_property *property;
+	int enum_count = 0;
+	int value_count = 0;
+	int ret = 0, i;
+	int copied;
+	struct drm_property_enum *prop_enum;
+	struct drm_mode_property_enum __user *enum_ptr;
+	uint64_t __user *values_ptr;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	drm_modeset_lock_all(dev);
+	property = drm_property_find(dev, out_resp->prop_id);
+	if (!property) {
+		ret = -ENOENT;
+		goto done;
+	}
+
+	if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) ||
+			drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
+		list_for_each_entry(prop_enum, &property->enum_list, head)
+			enum_count++;
+	}
+
+	value_count = property->num_values;
+
+	strncpy(out_resp->name, property->name, DRM_PROP_NAME_LEN);
+	out_resp->name[DRM_PROP_NAME_LEN-1] = 0;
+	out_resp->flags = property->flags;
+
+	if ((out_resp->count_values >= value_count) && value_count) {
+		values_ptr = (uint64_t __user *)(unsigned long)out_resp->values_ptr;
+		for (i = 0; i < value_count; i++) {
+			if (copy_to_user(values_ptr + i, &property->values[i], sizeof(uint64_t))) {
+				ret = -EFAULT;
+				goto done;
+			}
+		}
+	}
+	out_resp->count_values = value_count;
+
+	if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) ||
+			drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
+		if ((out_resp->count_enum_blobs >= enum_count) && enum_count) {
+			copied = 0;
+			enum_ptr = (struct drm_mode_property_enum __user *)(unsigned long)out_resp->enum_blob_ptr;
+			list_for_each_entry(prop_enum, &property->enum_list, head) {
+
+				if (copy_to_user(&enum_ptr[copied].value, &prop_enum->value, sizeof(uint64_t))) {
+					ret = -EFAULT;
+					goto done;
+				}
+
+				if (copy_to_user(&enum_ptr[copied].name,
+						 &prop_enum->name, DRM_PROP_NAME_LEN)) {
+					ret = -EFAULT;
+					goto done;
+				}
+				copied++;
+			}
+		}
+		out_resp->count_enum_blobs = enum_count;
+	}
+
+	/*
+	 * NOTE: The idea seems to have been to use this to read all the blob
+	 * property values. But nothing ever added them to the corresponding
+	 * list, userspace always used the special-purpose get_blob ioctl to
+	 * read the value for a blob property. It also doesn't make a lot of
+	 * sense to return values here when everything else is just metadata for
+	 * the property itself.
+	 */
+	if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
+		out_resp->count_enum_blobs = 0;
+done:
+	drm_modeset_unlock_all(dev);
+	return ret;
+}
+
+static struct drm_property_blob *
+drm_property_create_blob(struct drm_device *dev, size_t length,
+			 const void *data)
+{
+	struct drm_property_blob *blob;
+	int ret;
+
+	if (!length || !data)
+		return NULL;
+
+	blob = kzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL);
+	if (!blob)
+		return NULL;
+
+	ret = drm_mode_object_get(dev, &blob->base, DRM_MODE_OBJECT_BLOB);
+	if (ret) {
+		kfree(blob);
+		return NULL;
+	}
+
+	blob->length = length;
+
+	memcpy(blob->data, data, length);
+
+	list_add_tail(&blob->head, &dev->mode_config.property_blob_list);
+	return blob;
+}
+
+static void drm_property_destroy_blob(struct drm_device *dev,
+			       struct drm_property_blob *blob)
+{
+	drm_mode_object_put(dev, &blob->base);
+	list_del(&blob->head);
+	kfree(blob);
+}
+
+/**
+ * drm_mode_getblob_ioctl - get the contents of a blob property value
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This function retrieves the contents of a blob property. The value stored in
+ * an object's blob property is just a normal modeset object id.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_getblob_ioctl(struct drm_device *dev,
+			   void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_get_blob *out_resp = data;
+	struct drm_property_blob *blob;
+	int ret = 0;
+	void __user *blob_ptr;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	drm_modeset_lock_all(dev);
+	blob = drm_property_blob_find(dev, out_resp->blob_id);
+	if (!blob) {
+		ret = -ENOENT;
+		goto done;
+	}
+
+	if (out_resp->length == blob->length) {
+		blob_ptr = (void __user *)(unsigned long)out_resp->data;
+		if (copy_to_user(blob_ptr, blob->data, blob->length)) {
+			ret = -EFAULT;
+			goto done;
+		}
+	}
+	out_resp->length = blob->length;
+
+done:
+	drm_modeset_unlock_all(dev);
+	return ret;
+}
+
+/**
+ * drm_mode_connector_set_path_property - set tile property on connector
+ * @connector: connector to set property on.
+ * @path: path to use for property.
+ *
+ * This creates a property to expose to userspace to specify a
+ * connector path. This is mainly used for DisplayPort MST where
+ * connectors have a topology and we want to allow userspace to give
+ * them more meaningful names.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_connector_set_path_property(struct drm_connector *connector,
+					 const char *path)
+{
+	struct drm_device *dev = connector->dev;
+	size_t size = strlen(path) + 1;
+	int ret;
+
+	connector->path_blob_ptr = drm_property_create_blob(connector->dev,
+							    size, path);
+	if (!connector->path_blob_ptr)
+		return -EINVAL;
+
+	ret = drm_object_property_set_value(&connector->base,
+					    dev->mode_config.path_property,
+					    connector->path_blob_ptr->base.id);
+	return ret;
+}
+EXPORT_SYMBOL(drm_mode_connector_set_path_property);
+
+/**
+ * drm_mode_connector_set_tile_property - set tile property on connector
+ * @connector: connector to set property on.
+ *
+ * This looks up the tile information for a connector, and creates a
+ * property for userspace to parse if it exists. The property is of
+ * the form of 8 integers using ':' as a separator.
+ *
+ * Returns:
+ * Zero on success, errno on failure.
+ */
+int drm_mode_connector_set_tile_property(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	int ret, size;
+	char tile[256];
+
+	if (connector->tile_blob_ptr)
+		drm_property_destroy_blob(dev, connector->tile_blob_ptr);
+
+	if (!connector->has_tile) {
+		connector->tile_blob_ptr = NULL;
+		ret = drm_object_property_set_value(&connector->base,
+						    dev->mode_config.tile_property, 0);
+		return ret;
+	}
+
+	snprintf(tile, 256, "%d:%d:%d:%d:%d:%d:%d:%d",
+		 connector->tile_group->id, connector->tile_is_single_monitor,
+		 connector->num_h_tile, connector->num_v_tile,
+		 connector->tile_h_loc, connector->tile_v_loc,
+		 connector->tile_h_size, connector->tile_v_size);
+	size = strlen(tile) + 1;
+
+	connector->tile_blob_ptr = drm_property_create_blob(connector->dev,
+							    size, tile);
+	if (!connector->tile_blob_ptr)
+		return -EINVAL;
+
+	ret = drm_object_property_set_value(&connector->base,
+					    dev->mode_config.tile_property,
+					    connector->tile_blob_ptr->base.id);
+	return ret;
+}
+EXPORT_SYMBOL(drm_mode_connector_set_tile_property);
+
+/**
+ * drm_mode_connector_update_edid_property - update the edid property of a connector
+ * @connector: drm connector
+ * @edid: new value of the edid property
+ *
+ * This function creates a new blob modeset object and assigns its id to the
+ * connector's edid property.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_connector_update_edid_property(struct drm_connector *connector,
+					    const struct edid *edid)
+{
+	struct drm_device *dev = connector->dev;
+	size_t size;
+	int ret;
+
+	/* ignore requests to set edid when overridden */
+	if (connector->override_edid)
+		return 0;
+
+	if (connector->edid_blob_ptr)
+		drm_property_destroy_blob(dev, connector->edid_blob_ptr);
+
+	/* Delete edid, when there is none. */
+	if (!edid) {
+		connector->edid_blob_ptr = NULL;
+		ret = drm_object_property_set_value(&connector->base, dev->mode_config.edid_property, 0);
+		return ret;
+	}
+
+	size = EDID_LENGTH * (1 + edid->extensions);
+	connector->edid_blob_ptr = drm_property_create_blob(connector->dev,
+							    size, edid);
+	if (!connector->edid_blob_ptr)
+		return -EINVAL;
+
+	ret = drm_object_property_set_value(&connector->base,
+					       dev->mode_config.edid_property,
+					       connector->edid_blob_ptr->base.id);
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_mode_connector_update_edid_property);
+
+/* Some properties could refer to dynamic refcnt'd objects, or things that
+ * need special locking to handle lifetime issues (ie. to ensure the prop
+ * value doesn't become invalid part way through the property update due to
+ * race).  The value returned by reference via 'obj' should be passed back
+ * to drm_property_change_valid_put() after the property is set (and the
+ * object to which the property is attached has a chance to take it's own
+ * reference).
+ */
+bool drm_property_change_valid_get(struct drm_property *property,
+					 uint64_t value, struct drm_mode_object **ref)
+{
+	int i;
+
+	if (property->flags & DRM_MODE_PROP_IMMUTABLE)
+		return false;
+
+	*ref = NULL;
+
+	if (drm_property_type_is(property, DRM_MODE_PROP_RANGE)) {
+		if (value < property->values[0] || value > property->values[1])
+			return false;
+		return true;
+	} else if (drm_property_type_is(property, DRM_MODE_PROP_SIGNED_RANGE)) {
+		int64_t svalue = U642I64(value);
+
+		if (svalue < U642I64(property->values[0]) ||
+				svalue > U642I64(property->values[1]))
+			return false;
+		return true;
+	} else if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
+		uint64_t valid_mask = 0;
+
+		for (i = 0; i < property->num_values; i++)
+			valid_mask |= (1ULL << property->values[i]);
+		return !(value & ~valid_mask);
+	} else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) {
+		/* Only the driver knows */
+		return true;
+	} else if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
+		/* a zero value for an object property translates to null: */
+		if (value == 0)
+			return true;
+
+		/* handle refcnt'd objects specially: */
+		if (property->values[0] == DRM_MODE_OBJECT_FB) {
+			struct drm_framebuffer *fb;
+			fb = drm_framebuffer_lookup(property->dev, value);
+			if (fb) {
+				*ref = &fb->base;
+				return true;
+			} else {
+				return false;
+			}
+		} else {
+			return _object_find(property->dev, value, property->values[0]) != NULL;
+		}
+	}
+
+	for (i = 0; i < property->num_values; i++)
+		if (property->values[i] == value)
+			return true;
+	return false;
+}
+
+void drm_property_change_valid_put(struct drm_property *property,
+		struct drm_mode_object *ref)
+{
+	if (!ref)
+		return;
+
+	if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
+		if (property->values[0] == DRM_MODE_OBJECT_FB)
+			drm_framebuffer_unreference(obj_to_fb(ref));
+	}
+}
+
+/**
+ * drm_mode_connector_property_set_ioctl - set the current value of a connector property
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This function sets the current value for a connectors's property. It also
+ * calls into a driver's ->set_property callback to update the hardware state
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_connector_property_set_ioctl(struct drm_device *dev,
+				       void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_connector_set_property *conn_set_prop = data;
+	struct drm_mode_obj_set_property obj_set_prop = {
+		.value = conn_set_prop->value,
+		.prop_id = conn_set_prop->prop_id,
+		.obj_id = conn_set_prop->connector_id,
+		.obj_type = DRM_MODE_OBJECT_CONNECTOR
+	};
+
+	/* It does all the locking and checking we need */
+	return drm_mode_obj_set_property_ioctl(dev, &obj_set_prop, file_priv);
+}
+
+static int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj,
+					   struct drm_property *property,
+					   uint64_t value)
+{
+	int ret = -EINVAL;
+	struct drm_connector *connector = obj_to_connector(obj);
+
+	/* Do DPMS ourselves */
+	if (property == connector->dev->mode_config.dpms_property) {
+		if (connector->funcs->dpms)
+			(*connector->funcs->dpms)(connector, (int)value);
+		ret = 0;
+	} else if (connector->funcs->set_property)
+		ret = connector->funcs->set_property(connector, property, value);
+
+	/* store the property value if successful */
+	if (!ret)
+		drm_object_property_set_value(&connector->base, property, value);
+	return ret;
+}
+
+static int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
+				      struct drm_property *property,
+				      uint64_t value)
+{
+	int ret = -EINVAL;
+	struct drm_crtc *crtc = obj_to_crtc(obj);
+
+	if (crtc->funcs->set_property)
+		ret = crtc->funcs->set_property(crtc, property, value);
+	if (!ret)
+		drm_object_property_set_value(obj, property, value);
+
+	return ret;
+}
+
+/**
+ * drm_mode_plane_set_obj_prop - set the value of a property
+ * @plane: drm plane object to set property value for
+ * @property: property to set
+ * @value: value the property should be set to
+ *
+ * This functions sets a given property on a given plane object. This function
+ * calls the driver's ->set_property callback and changes the software state of
+ * the property if the callback succeeds.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
+				struct drm_property *property,
+				uint64_t value)
+{
+	int ret = -EINVAL;
+	struct drm_mode_object *obj = &plane->base;
+
+	if (plane->funcs->set_property)
+		ret = plane->funcs->set_property(plane, property, value);
+	if (!ret)
+		drm_object_property_set_value(obj, property, value);
+
+	return ret;
+}
+EXPORT_SYMBOL(drm_mode_plane_set_obj_prop);
+
+/**
+ * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This function retrieves the current value for an object's property. Compared
+ * to the connector specific ioctl this one is extended to also work on crtc and
+ * plane objects.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
+				      struct drm_file *file_priv)
+{
+	struct drm_mode_obj_get_properties *arg = data;
+	struct drm_mode_object *obj;
+	int ret = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	drm_modeset_lock_all(dev);
+
+	obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
+	if (!obj) {
+		ret = -ENOENT;
+		goto out;
+	}
+	if (!obj->properties) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = get_properties(obj, file_priv->atomic,
+			(uint32_t __user *)(unsigned long)(arg->props_ptr),
+			(uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
+			&arg->count_props);
+
+out:
+	drm_modeset_unlock_all(dev);
+	return ret;
+}
+
+/**
+ * drm_mode_obj_set_property_ioctl - set the current value of an object's property
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This function sets the current value for an object's property. It also calls
+ * into a driver's ->set_property callback to update the hardware state.
+ * Compared to the connector specific ioctl this one is extended to also work on
+ * crtc and plane objects.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
+				    struct drm_file *file_priv)
+{
+	struct drm_mode_obj_set_property *arg = data;
+	struct drm_mode_object *arg_obj;
+	struct drm_mode_object *prop_obj;
+	struct drm_property *property;
+	int i, ret = -EINVAL;
+	struct drm_mode_object *ref;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	drm_modeset_lock_all(dev);
+
+	arg_obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
+	if (!arg_obj) {
+		ret = -ENOENT;
+		goto out;
+	}
+	if (!arg_obj->properties)
+		goto out;
+
+	for (i = 0; i < arg_obj->properties->count; i++)
+		if (arg_obj->properties->properties[i]->base.id == arg->prop_id)
+			break;
+
+	if (i == arg_obj->properties->count)
+		goto out;
+
+	prop_obj = drm_mode_object_find(dev, arg->prop_id,
+					DRM_MODE_OBJECT_PROPERTY);
+	if (!prop_obj) {
+		ret = -ENOENT;
+		goto out;
+	}
+	property = obj_to_property(prop_obj);
+
+	if (!drm_property_change_valid_get(property, arg->value, &ref))
+		goto out;
+
+	switch (arg_obj->type) {
+	case DRM_MODE_OBJECT_CONNECTOR:
+		ret = drm_mode_connector_set_obj_prop(arg_obj, property,
+						      arg->value);
+		break;
+	case DRM_MODE_OBJECT_CRTC:
+		ret = drm_mode_crtc_set_obj_prop(arg_obj, property, arg->value);
+		break;
+	case DRM_MODE_OBJECT_PLANE:
+		ret = drm_mode_plane_set_obj_prop(obj_to_plane(arg_obj),
+						  property, arg->value);
+		break;
+	}
+
+	drm_property_change_valid_put(property, ref);
+
+out:
+	drm_modeset_unlock_all(dev);
+	return ret;
+}
+
+/**
+ * drm_mode_connector_attach_encoder - attach a connector to an encoder
+ * @connector: connector to attach
+ * @encoder: encoder to attach @connector to
+ *
+ * This function links up a connector to an encoder. Note that the routing
+ * restrictions between encoders and crtcs are exposed to userspace through the
+ * possible_clones and possible_crtcs bitmasks.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_connector_attach_encoder(struct drm_connector *connector,
+				      struct drm_encoder *encoder)
+{
+	int i;
+
+	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
+		if (connector->encoder_ids[i] == 0) {
+			connector->encoder_ids[i] = encoder->base.id;
+			return 0;
+		}
+	}
+	return -ENOMEM;
+}
+EXPORT_SYMBOL(drm_mode_connector_attach_encoder);
+
+/**
+ * drm_mode_crtc_set_gamma_size - set the gamma table size
+ * @crtc: CRTC to set the gamma table size for
+ * @gamma_size: size of the gamma table
+ *
+ * Drivers which support gamma tables should set this to the supported gamma
+ * table size when initializing the CRTC. Currently the drm core only supports a
+ * fixed gamma table size.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
+				 int gamma_size)
+{
+	crtc->gamma_size = gamma_size;
+
+	crtc->gamma_store = kcalloc(gamma_size, sizeof(uint16_t) * 3,
+				    GFP_KERNEL);
+	if (!crtc->gamma_store) {
+		crtc->gamma_size = 0;
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_mode_crtc_set_gamma_size);
+
+/**
+ * drm_mode_gamma_set_ioctl - set the gamma table
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * Set the gamma table of a CRTC to the one passed in by the user. Userspace can
+ * inquire the required gamma table size through drm_mode_gamma_get_ioctl.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_gamma_set_ioctl(struct drm_device *dev,
+			     void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_crtc_lut *crtc_lut = data;
+	struct drm_crtc *crtc;
+	void *r_base, *g_base, *b_base;
+	int size;
+	int ret = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	drm_modeset_lock_all(dev);
+	crtc = drm_crtc_find(dev, crtc_lut->crtc_id);
+	if (!crtc) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	if (crtc->funcs->gamma_set == NULL) {
+		ret = -ENOSYS;
+		goto out;
+	}
+
+	/* memcpy into gamma store */
+	if (crtc_lut->gamma_size != crtc->gamma_size) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	size = crtc_lut->gamma_size * (sizeof(uint16_t));
+	r_base = crtc->gamma_store;
+	if (copy_from_user(r_base, (void __user *)(unsigned long)crtc_lut->red, size)) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	g_base = r_base + size;
+	if (copy_from_user(g_base, (void __user *)(unsigned long)crtc_lut->green, size)) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	b_base = g_base + size;
+	if (copy_from_user(b_base, (void __user *)(unsigned long)crtc_lut->blue, size)) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
+
+out:
+	drm_modeset_unlock_all(dev);
+	return ret;
+
+}
+
+/**
+ * drm_mode_gamma_get_ioctl - get the gamma table
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * Copy the current gamma table into the storage provided. This also provides
+ * the gamma table size the driver expects, which can be used to size the
+ * allocated storage.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_gamma_get_ioctl(struct drm_device *dev,
+			     void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_crtc_lut *crtc_lut = data;
+	struct drm_crtc *crtc;
+	void *r_base, *g_base, *b_base;
+	int size;
+	int ret = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	drm_modeset_lock_all(dev);
+	crtc = drm_crtc_find(dev, crtc_lut->crtc_id);
+	if (!crtc) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	/* memcpy into gamma store */
+	if (crtc_lut->gamma_size != crtc->gamma_size) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	size = crtc_lut->gamma_size * (sizeof(uint16_t));
+	r_base = crtc->gamma_store;
+	if (copy_to_user((void __user *)(unsigned long)crtc_lut->red, r_base, size)) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	g_base = r_base + size;
+	if (copy_to_user((void __user *)(unsigned long)crtc_lut->green, g_base, size)) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	b_base = g_base + size;
+	if (copy_to_user((void __user *)(unsigned long)crtc_lut->blue, b_base, size)) {
+		ret = -EFAULT;
+		goto out;
+	}
+out:
+	drm_modeset_unlock_all(dev);
+	return ret;
+}
+
+/**
+ * drm_mode_page_flip_ioctl - schedule an asynchronous fb update
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This schedules an asynchronous update on a given CRTC, called page flip.
+ * Optionally a drm event is generated to signal the completion of the event.
+ * Generic drivers cannot assume that a pageflip with changed framebuffer
+ * properties (including driver specific metadata like tiling layout) will work,
+ * but some drivers support e.g. pixel format changes through the pageflip
+ * ioctl.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_page_flip_ioctl(struct drm_device *dev,
+			     void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_crtc_page_flip *page_flip = data;
+	struct drm_crtc *crtc;
+	struct drm_framebuffer *fb = NULL;
+	struct drm_pending_vblank_event *e = NULL;
+	unsigned long flags;
+	int ret = -EINVAL;
+
+	if (page_flip->flags & ~DRM_MODE_PAGE_FLIP_FLAGS ||
+	    page_flip->reserved != 0)
+		return -EINVAL;
+
+	if ((page_flip->flags & DRM_MODE_PAGE_FLIP_ASYNC) && !dev->mode_config.async_page_flip)
+		return -EINVAL;
+
+	crtc = drm_crtc_find(dev, page_flip->crtc_id);
+	if (!crtc)
+		return -ENOENT;
+
+	drm_modeset_lock_crtc(crtc, crtc->primary);
+	if (crtc->primary->fb == NULL) {
+		/* The framebuffer is currently unbound, presumably
+		 * due to a hotplug event, that userspace has not
+		 * yet discovered.
+		 */
+		ret = -EBUSY;
+		goto out;
+	}
+
+	if (crtc->funcs->page_flip == NULL)
+		goto out;
+
+	fb = drm_framebuffer_lookup(dev, page_flip->fb_id);
+	if (!fb) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	ret = drm_crtc_check_viewport(crtc, crtc->x, crtc->y, &crtc->mode, fb);
+	if (ret)
+		goto out;
+
+	if (crtc->primary->fb->pixel_format != fb->pixel_format) {
+		DRM_DEBUG_KMS("Page flip is not allowed to change frame buffer format.\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
+		ret = -ENOMEM;
+		spin_lock_irqsave(&dev->event_lock, flags);
+		if (file_priv->event_space < sizeof(e->event)) {
+			spin_unlock_irqrestore(&dev->event_lock, flags);
+			goto out;
+		}
+		file_priv->event_space -= sizeof(e->event);
+		spin_unlock_irqrestore(&dev->event_lock, flags);
+
+		e = kzalloc(sizeof(*e), GFP_KERNEL);
+		if (e == NULL) {
+			spin_lock_irqsave(&dev->event_lock, flags);
+			file_priv->event_space += sizeof(e->event);
+			spin_unlock_irqrestore(&dev->event_lock, flags);
+			goto out;
+		}
+
+		e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
+		e->event.base.length = sizeof(e->event);
+		e->event.user_data = page_flip->user_data;
+		e->base.event = &e->event.base;
+		e->base.file_priv = file_priv;
+		e->base.destroy =
+			(void (*) (struct drm_pending_event *)) kfree;
+	}
+
+	crtc->primary->old_fb = crtc->primary->fb;
+	ret = crtc->funcs->page_flip(crtc, fb, e, page_flip->flags);
+	if (ret) {
+		if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
+			spin_lock_irqsave(&dev->event_lock, flags);
+			file_priv->event_space += sizeof(e->event);
+			spin_unlock_irqrestore(&dev->event_lock, flags);
+			kfree(e);
+		}
+		/* Keep the old fb, don't unref it. */
+		crtc->primary->old_fb = NULL;
+	} else {
+		/*
+		 * Warn if the driver hasn't properly updated the crtc->fb
+		 * field to reflect that the new framebuffer is now used.
+		 * Failing to do so will screw with the reference counting
+		 * on framebuffers.
+		 */
+		WARN_ON(crtc->primary->fb != fb);
+		/* Unref only the old framebuffer. */
+		fb = NULL;
+	}
+
+out:
+	if (fb)
+		drm_framebuffer_unreference(fb);
+	if (crtc->primary->old_fb)
+		drm_framebuffer_unreference(crtc->primary->old_fb);
+	crtc->primary->old_fb = NULL;
+	drm_modeset_unlock_crtc(crtc);
+
+	return ret;
+}
+
+/**
+ * drm_mode_config_reset - call ->reset callbacks
+ * @dev: drm device
+ *
+ * This functions calls all the crtc's, encoder's and connector's ->reset
+ * callback. Drivers can use this in e.g. their driver load or resume code to
+ * reset hardware and software state.
+ */
+void drm_mode_config_reset(struct drm_device *dev)
+{
+	struct drm_crtc *crtc;
+	struct drm_plane *plane;
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+
+	list_for_each_entry(plane, &dev->mode_config.plane_list, head)
+		if (plane->funcs->reset)
+			plane->funcs->reset(plane);
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+		if (crtc->funcs->reset)
+			crtc->funcs->reset(crtc);
+
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
+		if (encoder->funcs->reset)
+			encoder->funcs->reset(encoder);
+
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+		if (connector->funcs->reset)
+			connector->funcs->reset(connector);
+}
+EXPORT_SYMBOL(drm_mode_config_reset);
+
+/**
+ * drm_mode_create_dumb_ioctl - create a dumb backing storage buffer
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This creates a new dumb buffer in the driver's backing storage manager (GEM,
+ * TTM or something else entirely) and returns the resulting buffer handle. This
+ * handle can then be wrapped up into a framebuffer modeset object.
+ *
+ * Note that userspace is not allowed to use such objects for render
+ * acceleration - drivers must create their own private ioctls for such a use
+ * case.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_create_dumb_ioctl(struct drm_device *dev,
+			       void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_create_dumb *args = data;
+	u32 cpp, stride, size;
+
+	if (!dev->driver->dumb_create)
+		return -ENOSYS;
+	if (!args->width || !args->height || !args->bpp)
+		return -EINVAL;
+
+	/* overflow checks for 32bit size calculations */
+	/* NOTE: DIV_ROUND_UP() can overflow */
+	cpp = DIV_ROUND_UP(args->bpp, 8);
+	if (!cpp || cpp > 0xffffffffU / args->width)
+		return -EINVAL;
+	stride = cpp * args->width;
+	if (args->height > 0xffffffffU / stride)
+		return -EINVAL;
+
+	/* test for wrap-around */
+	size = args->height * stride;
+	if (PAGE_ALIGN(size) == 0)
+		return -EINVAL;
+
+	/*
+	 * handle, pitch and size are output parameters. Zero them out to
+	 * prevent drivers from accidentally using uninitialized data. Since
+	 * not all existing userspace is clearing these fields properly we
+	 * cannot reject IOCTL with garbage in them.
+	 */
+	args->handle = 0;
+	args->pitch = 0;
+	args->size = 0;
+
+	return dev->driver->dumb_create(file_priv, dev, args);
+}
+
+/**
+ * drm_mode_mmap_dumb_ioctl - create an mmap offset for a dumb backing storage buffer
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * Allocate an offset in the drm device node's address space to be able to
+ * memory map a dumb buffer.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
+			     void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_map_dumb *args = data;
+
+	/* call driver ioctl to get mmap offset */
+	if (!dev->driver->dumb_map_offset)
+		return -ENOSYS;
+
+	return dev->driver->dumb_map_offset(file_priv, dev, args->handle, &args->offset);
+}
+
+/**
+ * drm_mode_destroy_dumb_ioctl - destroy a dumb backing strage buffer
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This destroys the userspace handle for the given dumb backing storage buffer.
+ * Since buffer objects must be reference counted in the kernel a buffer object
+ * won't be immediately freed if a framebuffer modeset object still uses it.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
+				void *data, struct drm_file *file_priv)
+{
+	struct drm_mode_destroy_dumb *args = data;
+
+	if (!dev->driver->dumb_destroy)
+		return -ENOSYS;
+
+	return dev->driver->dumb_destroy(file_priv, dev, args->handle);
+}
+
+/**
+ * drm_fb_get_bpp_depth - get the bpp/depth values for format
+ * @format: pixel format (DRM_FORMAT_*)
+ * @depth: storage for the depth value
+ * @bpp: storage for the bpp value
+ *
+ * This only supports RGB formats here for compat with code that doesn't use
+ * pixel formats directly yet.
+ */
+void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
+			  int *bpp)
+{
+	switch (format) {
+	case DRM_FORMAT_C8:
+	case DRM_FORMAT_RGB332:
+	case DRM_FORMAT_BGR233:
+		*depth = 8;
+		*bpp = 8;
+		break;
+	case DRM_FORMAT_XRGB1555:
+	case DRM_FORMAT_XBGR1555:
+	case DRM_FORMAT_RGBX5551:
+	case DRM_FORMAT_BGRX5551:
+	case DRM_FORMAT_ARGB1555:
+	case DRM_FORMAT_ABGR1555:
+	case DRM_FORMAT_RGBA5551:
+	case DRM_FORMAT_BGRA5551:
+		*depth = 15;
+		*bpp = 16;
+		break;
+	case DRM_FORMAT_RGB565:
+	case DRM_FORMAT_BGR565:
+		*depth = 16;
+		*bpp = 16;
+		break;
+	case DRM_FORMAT_RGB888:
+	case DRM_FORMAT_BGR888:
+		*depth = 24;
+		*bpp = 24;
+		break;
+	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_XBGR8888:
+	case DRM_FORMAT_RGBX8888:
+	case DRM_FORMAT_BGRX8888:
+		*depth = 24;
+		*bpp = 32;
+		break;
+	case DRM_FORMAT_XRGB2101010:
+	case DRM_FORMAT_XBGR2101010:
+	case DRM_FORMAT_RGBX1010102:
+	case DRM_FORMAT_BGRX1010102:
+	case DRM_FORMAT_ARGB2101010:
+	case DRM_FORMAT_ABGR2101010:
+	case DRM_FORMAT_RGBA1010102:
+	case DRM_FORMAT_BGRA1010102:
+		*depth = 30;
+		*bpp = 32;
+		break;
+	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_ABGR8888:
+	case DRM_FORMAT_RGBA8888:
+	case DRM_FORMAT_BGRA8888:
+		*depth = 32;
+		*bpp = 32;
+		break;
+	default:
+		DRM_DEBUG_KMS("unsupported pixel format %s\n",
+			      drm_get_format_name(format));
+		*depth = 0;
+		*bpp = 0;
+		break;
+	}
+}
+EXPORT_SYMBOL(drm_fb_get_bpp_depth);
+
+/**
+ * drm_format_num_planes - get the number of planes for format
+ * @format: pixel format (DRM_FORMAT_*)
+ *
+ * Returns:
+ * The number of planes used by the specified pixel format.
+ */
+int drm_format_num_planes(uint32_t format)
+{
+	switch (format) {
+	case DRM_FORMAT_YUV410:
+	case DRM_FORMAT_YVU410:
+	case DRM_FORMAT_YUV411:
+	case DRM_FORMAT_YVU411:
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+	case DRM_FORMAT_YUV422:
+	case DRM_FORMAT_YVU422:
+	case DRM_FORMAT_YUV444:
+	case DRM_FORMAT_YVU444:
+		return 3;
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV16:
+	case DRM_FORMAT_NV61:
+	case DRM_FORMAT_NV24:
+	case DRM_FORMAT_NV42:
+		return 2;
+	default:
+		return 1;
+	}
+}
+EXPORT_SYMBOL(drm_format_num_planes);
+
+/**
+ * drm_format_plane_cpp - determine the bytes per pixel value
+ * @format: pixel format (DRM_FORMAT_*)
+ * @plane: plane index
+ *
+ * Returns:
+ * The bytes per pixel value for the specified plane.
+ */
+int drm_format_plane_cpp(uint32_t format, int plane)
+{
+	unsigned int depth;
+	int bpp;
+
+	if (plane >= drm_format_num_planes(format))
+		return 0;
+
+	switch (format) {
+	case DRM_FORMAT_YUYV:
+	case DRM_FORMAT_YVYU:
+	case DRM_FORMAT_UYVY:
+	case DRM_FORMAT_VYUY:
+		return 2;
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV16:
+	case DRM_FORMAT_NV61:
+	case DRM_FORMAT_NV24:
+	case DRM_FORMAT_NV42:
+		return plane ? 2 : 1;
+	case DRM_FORMAT_YUV410:
+	case DRM_FORMAT_YVU410:
+	case DRM_FORMAT_YUV411:
+	case DRM_FORMAT_YVU411:
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+	case DRM_FORMAT_YUV422:
+	case DRM_FORMAT_YVU422:
+	case DRM_FORMAT_YUV444:
+	case DRM_FORMAT_YVU444:
+		return 1;
+	default:
+		drm_fb_get_bpp_depth(format, &depth, &bpp);
+		return bpp >> 3;
+	}
+}
+EXPORT_SYMBOL(drm_format_plane_cpp);
+
+/**
+ * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
+ * @format: pixel format (DRM_FORMAT_*)
+ *
+ * Returns:
+ * The horizontal chroma subsampling factor for the
+ * specified pixel format.
+ */
+int drm_format_horz_chroma_subsampling(uint32_t format)
+{
+	switch (format) {
+	case DRM_FORMAT_YUV411:
+	case DRM_FORMAT_YVU411:
+	case DRM_FORMAT_YUV410:
+	case DRM_FORMAT_YVU410:
+		return 4;
+	case DRM_FORMAT_YUYV:
+	case DRM_FORMAT_YVYU:
+	case DRM_FORMAT_UYVY:
+	case DRM_FORMAT_VYUY:
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV16:
+	case DRM_FORMAT_NV61:
+	case DRM_FORMAT_YUV422:
+	case DRM_FORMAT_YVU422:
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+		return 2;
+	default:
+		return 1;
+	}
+}
+EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);
+
+/**
+ * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
+ * @format: pixel format (DRM_FORMAT_*)
+ *
+ * Returns:
+ * The vertical chroma subsampling factor for the
+ * specified pixel format.
+ */
+int drm_format_vert_chroma_subsampling(uint32_t format)
+{
+	switch (format) {
+	case DRM_FORMAT_YUV410:
+	case DRM_FORMAT_YVU410:
+		return 4;
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+		return 2;
+	default:
+		return 1;
+	}
+}
+EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
+
+/**
+ * drm_rotation_simplify() - Try to simplify the rotation
+ * @rotation: Rotation to be simplified
+ * @supported_rotations: Supported rotations
+ *
+ * Attempt to simplify the rotation to a form that is supported.
+ * Eg. if the hardware supports everything except DRM_REFLECT_X
+ * one could call this function like this:
+ *
+ * drm_rotation_simplify(rotation, BIT(DRM_ROTATE_0) |
+ *                       BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_180) |
+ *                       BIT(DRM_ROTATE_270) | BIT(DRM_REFLECT_Y));
+ *
+ * to eliminate the DRM_ROTATE_X flag. Depending on what kind of
+ * transforms the hardware supports, this function may not
+ * be able to produce a supported transform, so the caller should
+ * check the result afterwards.
+ */
+unsigned int drm_rotation_simplify(unsigned int rotation,
+				   unsigned int supported_rotations)
+{
+	if (rotation & ~supported_rotations) {
+		rotation ^= BIT(DRM_REFLECT_X) | BIT(DRM_REFLECT_Y);
+		rotation = (rotation & ~0xf) | BIT((ffs(rotation & 0xf) + 1) % 4);
+	}
+
+	return rotation;
+}
+EXPORT_SYMBOL(drm_rotation_simplify);
+
+/**
+ * drm_mode_config_init - initialize DRM mode_configuration structure
+ * @dev: DRM device
+ *
+ * Initialize @dev's mode_config structure, used for tracking the graphics
+ * configuration of @dev.
+ *
+ * Since this initializes the modeset locks, no locking is possible. Which is no
+ * problem, since this should happen single threaded at init time. It is the
+ * driver's problem to ensure this guarantee.
+ *
+ */
+void drm_mode_config_init(struct drm_device *dev)
+{
+	mutex_init(&dev->mode_config.mutex);
+	drm_modeset_lock_init(&dev->mode_config.connection_mutex);
+	mutex_init(&dev->mode_config.idr_mutex);
+	mutex_init(&dev->mode_config.fb_lock);
+	INIT_LIST_HEAD(&dev->mode_config.fb_list);
+	INIT_LIST_HEAD(&dev->mode_config.crtc_list);
+	INIT_LIST_HEAD(&dev->mode_config.connector_list);
+	INIT_LIST_HEAD(&dev->mode_config.encoder_list);
+	INIT_LIST_HEAD(&dev->mode_config.property_list);
+	INIT_LIST_HEAD(&dev->mode_config.property_blob_list);
+	INIT_LIST_HEAD(&dev->mode_config.plane_list);
+	idr_init(&dev->mode_config.crtc_idr);
+	idr_init(&dev->mode_config.tile_idr);
+
+	drm_modeset_lock_all(dev);
+	drm_mode_create_standard_properties(dev);
+	drm_modeset_unlock_all(dev);
+
+	/* Just to be sure */
+	dev->mode_config.num_fb = 0;
+	dev->mode_config.num_connector = 0;
+	dev->mode_config.num_crtc = 0;
+	dev->mode_config.num_encoder = 0;
+	dev->mode_config.num_overlay_plane = 0;
+	dev->mode_config.num_total_plane = 0;
+}
+EXPORT_SYMBOL(drm_mode_config_init);
+
+/**
+ * drm_mode_config_cleanup - free up DRM mode_config info
+ * @dev: DRM device
+ *
+ * Free up all the connectors and CRTCs associated with this DRM device, then
+ * free up the framebuffers and associated buffer objects.
+ *
+ * Note that since this /should/ happen single-threaded at driver/device
+ * teardown time, no locking is required. It's the driver's job to ensure that
+ * this guarantee actually holds true.
+ *
+ * FIXME: cleanup any dangling user buffer objects too
+ */
+void drm_mode_config_cleanup(struct drm_device *dev)
+{
+	struct drm_connector *connector, *ot;
+	struct drm_crtc *crtc, *ct;
+	struct drm_encoder *encoder, *enct;
+	struct drm_framebuffer *fb, *fbt;
+	struct drm_property *property, *pt;
+	struct drm_property_blob *blob, *bt;
+	struct drm_plane *plane, *plt;
+
+	list_for_each_entry_safe(encoder, enct, &dev->mode_config.encoder_list,
+				 head) {
+		encoder->funcs->destroy(encoder);
+	}
+
+	list_for_each_entry_safe(connector, ot,
+				 &dev->mode_config.connector_list, head) {
+		connector->funcs->destroy(connector);
+	}
+
+	list_for_each_entry_safe(property, pt, &dev->mode_config.property_list,
+				 head) {
+		drm_property_destroy(dev, property);
+	}
+
+	list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list,
+				 head) {
+		drm_property_destroy_blob(dev, blob);
+	}
+
+	/*
+	 * Single-threaded teardown context, so it's not required to grab the
+	 * fb_lock to protect against concurrent fb_list access. Contrary, it
+	 * would actually deadlock with the drm_framebuffer_cleanup function.
+	 *
+	 * Also, if there are any framebuffers left, that's a driver leak now,
+	 * so politely WARN about this.
+	 */
+	WARN_ON(!list_empty(&dev->mode_config.fb_list));
+	list_for_each_entry_safe(fb, fbt, &dev->mode_config.fb_list, head) {
+		drm_framebuffer_remove(fb);
+	}
+
+	list_for_each_entry_safe(plane, plt, &dev->mode_config.plane_list,
+				 head) {
+		plane->funcs->destroy(plane);
+	}
+
+	list_for_each_entry_safe(crtc, ct, &dev->mode_config.crtc_list, head) {
+		crtc->funcs->destroy(crtc);
+	}
+
+	idr_destroy(&dev->mode_config.tile_idr);
+	idr_destroy(&dev->mode_config.crtc_idr);
+	drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
+}
+EXPORT_SYMBOL(drm_mode_config_cleanup);
+
+struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
+						       unsigned int supported_rotations)
+{
+	static const struct drm_prop_enum_list props[] = {
+		{ DRM_ROTATE_0,   "rotate-0" },
+		{ DRM_ROTATE_90,  "rotate-90" },
+		{ DRM_ROTATE_180, "rotate-180" },
+		{ DRM_ROTATE_270, "rotate-270" },
+		{ DRM_REFLECT_X,  "reflect-x" },
+		{ DRM_REFLECT_Y,  "reflect-y" },
+	};
+
+	return drm_property_create_bitmask(dev, 0, "rotation",
+					   props, ARRAY_SIZE(props),
+					   supported_rotations);
+}
+EXPORT_SYMBOL(drm_mode_create_rotation_property);
+
+/**
+ * DOC: Tile group
+ *
+ * Tile groups are used to represent tiled monitors with a unique
+ * integer identifier. Tiled monitors using DisplayID v1.3 have
+ * a unique 8-byte handle, we store this in a tile group, so we
+ * have a common identifier for all tiles in a monitor group.
+ */
+static void drm_tile_group_free(struct kref *kref)
+{
+	struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount);
+	struct drm_device *dev = tg->dev;
+	mutex_lock(&dev->mode_config.idr_mutex);
+	idr_remove(&dev->mode_config.tile_idr, tg->id);
+	mutex_unlock(&dev->mode_config.idr_mutex);
+	kfree(tg);
+}
+
+/**
+ * drm_mode_put_tile_group - drop a reference to a tile group.
+ * @dev: DRM device
+ * @tg: tile group to drop reference to.
+ *
+ * drop reference to tile group and free if 0.
+ */
+void drm_mode_put_tile_group(struct drm_device *dev,
+			     struct drm_tile_group *tg)
+{
+	kref_put(&tg->refcount, drm_tile_group_free);
+}
+
+/**
+ * drm_mode_get_tile_group - get a reference to an existing tile group
+ * @dev: DRM device
+ * @topology: 8-bytes unique per monitor.
+ *
+ * Use the unique bytes to get a reference to an existing tile group.
+ *
+ * RETURNS:
+ * tile group or NULL if not found.
+ */
+struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
+					       char topology[8])
+{
+	struct drm_tile_group *tg;
+	int id;
+	mutex_lock(&dev->mode_config.idr_mutex);
+	idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) {
+		if (!memcmp(tg->group_data, topology, 8)) {
+			if (!kref_get_unless_zero(&tg->refcount))
+				tg = NULL;
+			mutex_unlock(&dev->mode_config.idr_mutex);
+			return tg;
+		}
+	}
+	mutex_unlock(&dev->mode_config.idr_mutex);
+	return NULL;
+}
+EXPORT_SYMBOL(drm_mode_get_tile_group);
+
+/**
+ * drm_mode_create_tile_group - create a tile group from a displayid description
+ * @dev: DRM device
+ * @topology: 8-bytes unique per monitor.
+ *
+ * Create a tile group for the unique monitor, and get a unique
+ * identifier for the tile group.
+ *
+ * RETURNS:
+ * new tile group or error.
+ */
+struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
+						  char topology[8])
+{
+	struct drm_tile_group *tg;
+	int ret;
+
+	tg = kzalloc(sizeof(*tg), GFP_KERNEL);
+	if (!tg)
+		return ERR_PTR(-ENOMEM);
+
+	kref_init(&tg->refcount);
+	memcpy(tg->group_data, topology, 8);
+	tg->dev = dev;
+
+	mutex_lock(&dev->mode_config.idr_mutex);
+	ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL);
+	if (ret >= 0) {
+		tg->id = ret;
+	} else {
+		kfree(tg);
+		tg = ERR_PTR(ret);
+	}
+
+	mutex_unlock(&dev->mode_config.idr_mutex);
+	return tg;
+}
+EXPORT_SYMBOL(drm_mode_create_tile_group);