Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 695 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
new file mode 100644
index 000000000..8525ef851
--- /dev/null
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -0,0 +1,695 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * 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.
+ */
+
+#include <linux/uaccess.h>
+
+#include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_file.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mode_config.h>
+#include <drm/drm_print.h>
+#include <linux/dma-resv.h>
+
+#include "drm_crtc_internal.h"
+#include "drm_internal.h"
+
+int drm_modeset_register_all(struct drm_device *dev)
+{
+	int ret;
+
+	ret = drm_plane_register_all(dev);
+	if (ret)
+		goto err_plane;
+
+	ret = drm_crtc_register_all(dev);
+	if  (ret)
+		goto err_crtc;
+
+	ret = drm_encoder_register_all(dev);
+	if (ret)
+		goto err_encoder;
+
+	ret = drm_connector_register_all(dev);
+	if (ret)
+		goto err_connector;
+
+	return 0;
+
+err_connector:
+	drm_encoder_unregister_all(dev);
+err_encoder:
+	drm_crtc_unregister_all(dev);
+err_crtc:
+	drm_plane_unregister_all(dev);
+err_plane:
+	return ret;
+}
+
+void drm_modeset_unregister_all(struct drm_device *dev)
+{
+	drm_connector_unregister_all(dev);
+	drm_encoder_unregister_all(dev);
+	drm_crtc_unregister_all(dev);
+	drm_plane_unregister_all(dev);
+}
+
+/**
+ * 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 drm_framebuffer *fb;
+	struct drm_connector *connector;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	int count, ret = 0;
+	uint32_t __user *fb_id;
+	uint32_t __user *crtc_id;
+	uint32_t __user *connector_id;
+	uint32_t __user *encoder_id;
+	struct drm_connector_list_iter conn_iter;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EOPNOTSUPP;
+
+	mutex_lock(&file_priv->fbs_lock);
+	count = 0;
+	fb_id = u64_to_user_ptr(card_res->fb_id_ptr);
+	list_for_each_entry(fb, &file_priv->fbs, filp_head) {
+		if (count < card_res->count_fbs &&
+		    put_user(fb->base.id, fb_id + count)) {
+			mutex_unlock(&file_priv->fbs_lock);
+			return -EFAULT;
+		}
+		count++;
+	}
+	card_res->count_fbs = count;
+	mutex_unlock(&file_priv->fbs_lock);
+
+	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;
+
+	count = 0;
+	crtc_id = u64_to_user_ptr(card_res->crtc_id_ptr);
+	drm_for_each_crtc(crtc, dev) {
+		if (drm_lease_held(file_priv, crtc->base.id)) {
+			if (count < card_res->count_crtcs &&
+			    put_user(crtc->base.id, crtc_id + count))
+				return -EFAULT;
+			count++;
+		}
+	}
+	card_res->count_crtcs = count;
+
+	count = 0;
+	encoder_id = u64_to_user_ptr(card_res->encoder_id_ptr);
+	drm_for_each_encoder(encoder, dev) {
+		if (count < card_res->count_encoders &&
+		    put_user(encoder->base.id, encoder_id + count))
+			return -EFAULT;
+		count++;
+	}
+	card_res->count_encoders = count;
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	count = 0;
+	connector_id = u64_to_user_ptr(card_res->connector_id_ptr);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		/* only expose writeback connectors if userspace understands them */
+		if (!file_priv->writeback_connectors &&
+		    (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK))
+			continue;
+
+		if (drm_lease_held(file_priv, connector->base.id)) {
+			if (count < card_res->count_connectors &&
+			    put_user(connector->base.id, connector_id + count)) {
+				drm_connector_list_iter_end(&conn_iter);
+				return -EFAULT;
+			}
+			count++;
+		}
+	}
+	card_res->count_connectors = count;
+	drm_connector_list_iter_end(&conn_iter);
+
+	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;
+	struct drm_connector_list_iter conn_iter;
+
+	drm_for_each_plane(plane, dev)
+		if (plane->funcs->reset)
+			plane->funcs->reset(plane);
+
+	drm_for_each_crtc(crtc, dev)
+		if (crtc->funcs->reset)
+			crtc->funcs->reset(crtc);
+
+	drm_for_each_encoder(encoder, dev)
+		if (encoder->funcs && encoder->funcs->reset)
+			encoder->funcs->reset(encoder);
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter)
+		if (connector->funcs->reset)
+			connector->funcs->reset(connector);
+	drm_connector_list_iter_end(&conn_iter);
+}
+EXPORT_SYMBOL(drm_mode_config_reset);
+
+/*
+ * Global properties
+ */
+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" },
+};
+
+static int drm_mode_create_standard_properties(struct drm_device *dev)
+{
+	struct drm_property *prop;
+	int ret;
+
+	ret = drm_connector_create_standard_properties(dev);
+	if (ret)
+		return ret;
+
+	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_signed_range(dev, DRM_MODE_PROP_ATOMIC,
+			"IN_FENCE_FD", -1, INT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_in_fence_fd = prop;
+
+	prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+			"OUT_FENCE_PTR", 0, U64_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_out_fence_ptr = 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(dev,
+			DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
+			"FB_DAMAGE_CLIPS", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_fb_damage_clips = prop;
+
+	prop = drm_property_create_bool(dev, DRM_MODE_PROP_ATOMIC,
+			"ACTIVE");
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_active = prop;
+
+	prop = drm_property_create(dev,
+			DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
+			"MODE_ID", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_mode_id = prop;
+
+	prop = drm_property_create_bool(dev, 0,
+			"VRR_ENABLED");
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.prop_vrr_enabled = prop;
+
+	prop = drm_property_create(dev,
+			DRM_MODE_PROP_BLOB,
+			"DEGAMMA_LUT", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.degamma_lut_property = prop;
+
+	prop = drm_property_create_range(dev,
+			DRM_MODE_PROP_IMMUTABLE,
+			"DEGAMMA_LUT_SIZE", 0, UINT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.degamma_lut_size_property = prop;
+
+	prop = drm_property_create(dev,
+			DRM_MODE_PROP_BLOB,
+			"CTM", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.ctm_property = prop;
+
+	prop = drm_property_create(dev,
+			DRM_MODE_PROP_BLOB,
+			"GAMMA_LUT", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.gamma_lut_property = prop;
+
+	prop = drm_property_create_range(dev,
+			DRM_MODE_PROP_IMMUTABLE,
+			"GAMMA_LUT_SIZE", 0, UINT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.gamma_lut_size_property = prop;
+
+	prop = drm_property_create(dev,
+				   DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
+				   "IN_FORMATS", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.modifiers_property = prop;
+
+	return 0;
+}
+
+static void drm_mode_config_init_release(struct drm_device *dev, void *ptr)
+{
+	drm_mode_config_cleanup(dev);
+}
+
+/**
+ * drmm_mode_config_init - managed DRM mode_configuration structure
+ * 	initialization
+ * @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.
+ *
+ * Cleanup is automatically handled through registering drm_mode_config_cleanup
+ * with drmm_add_action().
+ *
+ * Returns: 0 on success, negative error value on failure.
+ */
+int drmm_mode_config_init(struct drm_device *dev)
+{
+	int ret;
+
+	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);
+	mutex_init(&dev->mode_config.blob_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);
+	INIT_LIST_HEAD(&dev->mode_config.privobj_list);
+	idr_init_base(&dev->mode_config.object_idr, 1);
+	idr_init_base(&dev->mode_config.tile_idr, 1);
+	ida_init(&dev->mode_config.connector_ida);
+	spin_lock_init(&dev->mode_config.connector_list_lock);
+
+	init_llist_head(&dev->mode_config.connector_free_list);
+	INIT_WORK(&dev->mode_config.connector_free_work, drm_connector_free_work_fn);
+
+	ret = drm_mode_create_standard_properties(dev);
+	if (ret) {
+		drm_mode_config_cleanup(dev);
+		return ret;
+	}
+
+	/* 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_total_plane = 0;
+
+	if (IS_ENABLED(CONFIG_LOCKDEP)) {
+		struct drm_modeset_acquire_ctx modeset_ctx;
+		struct ww_acquire_ctx resv_ctx;
+		struct dma_resv resv;
+		int ret;
+
+		dma_resv_init(&resv);
+
+		drm_modeset_acquire_init(&modeset_ctx, 0);
+		ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
+				       &modeset_ctx);
+		if (ret == -EDEADLK)
+			ret = drm_modeset_backoff(&modeset_ctx);
+
+		ww_acquire_init(&resv_ctx, &reservation_ww_class);
+		ret = dma_resv_lock(&resv, &resv_ctx);
+		if (ret == -EDEADLK)
+			dma_resv_lock_slow(&resv, &resv_ctx);
+
+		dma_resv_unlock(&resv);
+		ww_acquire_fini(&resv_ctx);
+
+		drm_modeset_drop_locks(&modeset_ctx);
+		drm_modeset_acquire_fini(&modeset_ctx);
+		dma_resv_fini(&resv);
+	}
+
+	return drmm_add_action_or_reset(dev, drm_mode_config_init_release,
+					NULL);
+}
+EXPORT_SYMBOL(drmm_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: With the managed drmm_mode_config_init() it is no longer necessary for
+ * drivers to explicitly call this function.
+ */
+void drm_mode_config_cleanup(struct drm_device *dev)
+{
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
+	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);
+	}
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		/* drm_connector_list_iter holds an full reference to the
+		 * current connector itself, which means it is inherently safe
+		 * against unreferencing the current connector - but not against
+		 * deleting it right away. */
+		drm_connector_put(connector);
+	}
+	drm_connector_list_iter_end(&conn_iter);
+	/* connector_iter drops references in a work item. */
+	flush_work(&dev->mode_config.connector_free_work);
+	if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) {
+		drm_connector_list_iter_begin(dev, &conn_iter);
+		drm_for_each_connector_iter(connector, &conn_iter)
+			DRM_ERROR("connector %s leaked!\n", connector->name);
+		drm_connector_list_iter_end(&conn_iter);
+	}
+
+	list_for_each_entry_safe(property, pt, &dev->mode_config.property_list,
+				 head) {
+		drm_property_destroy(dev, property);
+	}
+
+	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);
+	}
+
+	list_for_each_entry_safe(blob, bt, &dev->mode_config.property_blob_list,
+				 head_global) {
+		drm_property_blob_put(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) {
+		struct drm_printer p = drm_debug_printer("[leaked fb]");
+
+		drm_printf(&p, "framebuffer[%u]:\n", fb->base.id);
+		drm_framebuffer_print_info(&p, 1, fb);
+		drm_framebuffer_free(&fb->base.refcount);
+	}
+
+	ida_destroy(&dev->mode_config.connector_ida);
+	idr_destroy(&dev->mode_config.tile_idr);
+	idr_destroy(&dev->mode_config.object_idr);
+	drm_modeset_lock_fini(&dev->mode_config.connection_mutex);
+}
+EXPORT_SYMBOL(drm_mode_config_cleanup);
+
+static u32 full_encoder_mask(struct drm_device *dev)
+{
+	struct drm_encoder *encoder;
+	u32 encoder_mask = 0;
+
+	drm_for_each_encoder(encoder, dev)
+		encoder_mask |= drm_encoder_mask(encoder);
+
+	return encoder_mask;
+}
+
+/*
+ * For some reason we want the encoder itself included in
+ * possible_clones. Make life easy for drivers by allowing them
+ * to leave possible_clones unset if no cloning is possible.
+ */
+static void fixup_encoder_possible_clones(struct drm_encoder *encoder)
+{
+	if (encoder->possible_clones == 0)
+		encoder->possible_clones = drm_encoder_mask(encoder);
+}
+
+static void validate_encoder_possible_clones(struct drm_encoder *encoder)
+{
+	struct drm_device *dev = encoder->dev;
+	u32 encoder_mask = full_encoder_mask(dev);
+	struct drm_encoder *other;
+
+	drm_for_each_encoder(other, dev) {
+		WARN(!!(encoder->possible_clones & drm_encoder_mask(other)) !=
+		     !!(other->possible_clones & drm_encoder_mask(encoder)),
+		     "possible_clones mismatch: "
+		     "[ENCODER:%d:%s] mask=0x%x possible_clones=0x%x vs. "
+		     "[ENCODER:%d:%s] mask=0x%x possible_clones=0x%x\n",
+		     encoder->base.id, encoder->name,
+		     drm_encoder_mask(encoder), encoder->possible_clones,
+		     other->base.id, other->name,
+		     drm_encoder_mask(other), other->possible_clones);
+	}
+
+	WARN((encoder->possible_clones & drm_encoder_mask(encoder)) == 0 ||
+	     (encoder->possible_clones & ~encoder_mask) != 0,
+	     "Bogus possible_clones: "
+	     "[ENCODER:%d:%s] possible_clones=0x%x (full encoder mask=0x%x)\n",
+	     encoder->base.id, encoder->name,
+	     encoder->possible_clones, encoder_mask);
+}
+
+static u32 full_crtc_mask(struct drm_device *dev)
+{
+	struct drm_crtc *crtc;
+	u32 crtc_mask = 0;
+
+	drm_for_each_crtc(crtc, dev)
+		crtc_mask |= drm_crtc_mask(crtc);
+
+	return crtc_mask;
+}
+
+static void validate_encoder_possible_crtcs(struct drm_encoder *encoder)
+{
+	u32 crtc_mask = full_crtc_mask(encoder->dev);
+
+	WARN((encoder->possible_crtcs & crtc_mask) == 0 ||
+	     (encoder->possible_crtcs & ~crtc_mask) != 0,
+	     "Bogus possible_crtcs: "
+	     "[ENCODER:%d:%s] possible_crtcs=0x%x (full crtc mask=0x%x)\n",
+	     encoder->base.id, encoder->name,
+	     encoder->possible_crtcs, crtc_mask);
+}
+
+void drm_mode_config_validate(struct drm_device *dev)
+{
+	struct drm_encoder *encoder;
+	struct drm_crtc *crtc;
+	struct drm_plane *plane;
+	u32 primary_with_crtc = 0, cursor_with_crtc = 0;
+	unsigned int num_primary = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return;
+
+	drm_for_each_encoder(encoder, dev)
+		fixup_encoder_possible_clones(encoder);
+
+	drm_for_each_encoder(encoder, dev) {
+		validate_encoder_possible_clones(encoder);
+		validate_encoder_possible_crtcs(encoder);
+	}
+
+	drm_for_each_crtc(crtc, dev) {
+		WARN(!crtc->primary, "Missing primary plane on [CRTC:%d:%s]\n",
+		     crtc->base.id, crtc->name);
+
+		WARN(crtc->cursor && crtc->funcs->cursor_set,
+		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set func",
+		     crtc->base.id, crtc->name);
+		WARN(crtc->cursor && crtc->funcs->cursor_set2,
+		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set2 func",
+		     crtc->base.id, crtc->name);
+		WARN(crtc->cursor && crtc->funcs->cursor_move,
+		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_move func",
+		     crtc->base.id, crtc->name);
+
+		if (crtc->primary) {
+			WARN(!(crtc->primary->possible_crtcs & drm_crtc_mask(crtc)),
+			     "Bogus primary plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
+			     crtc->primary->base.id, crtc->primary->name,
+			     crtc->base.id, crtc->name);
+			WARN(primary_with_crtc & drm_plane_mask(crtc->primary),
+			     "Primary plane [PLANE:%d:%s] used for multiple CRTCs",
+			     crtc->primary->base.id, crtc->primary->name);
+			primary_with_crtc |= drm_plane_mask(crtc->primary);
+		}
+		if (crtc->cursor) {
+			WARN(!(crtc->cursor->possible_crtcs & drm_crtc_mask(crtc)),
+			     "Bogus cursor plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
+			     crtc->cursor->base.id, crtc->cursor->name,
+			     crtc->base.id, crtc->name);
+			WARN(cursor_with_crtc & drm_plane_mask(crtc->cursor),
+			     "Cursor plane [PLANE:%d:%s] used for multiple CRTCs",
+			     crtc->cursor->base.id, crtc->cursor->name);
+			cursor_with_crtc |= drm_plane_mask(crtc->cursor);
+		}
+	}
+
+	drm_for_each_plane(plane, dev) {
+		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
+			num_primary++;
+	}
+
+	WARN(num_primary != dev->mode_config.num_crtc,
+	     "Must have as many primary planes as there are CRTCs, but have %u primary planes and %u CRTCs",
+	     num_primary, dev->mode_config.num_crtc);
+}