drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c - arm/linux-arm-legacy - Git at Google

 /**************************************************************************
  *
  * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sub license, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial portions
  * of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  **************************************************************************/

 #include "vmwgfx_kms.h"


 #define vmw_crtc_to_ldu(x) \
 	container_of(x, struct vmw_legacy_display_unit, base.crtc)
 #define vmw_encoder_to_ldu(x) \
 	container_of(x, struct vmw_legacy_display_unit, base.encoder)
 #define vmw_connector_to_ldu(x) \
 	container_of(x, struct vmw_legacy_display_unit, base.connector)

 struct vmw_legacy_display {
 	struct list_head active;

 	unsigned num_active;
 	unsigned last_num_active;

 	struct vmw_framebuffer *fb;
 };

 /**
  * Display unit using the legacy register interface.
  */
 struct vmw_legacy_display_unit {
 	struct vmw_display_unit base;

 	struct list_head active;
 };

 static void vmw_ldu_destroy(struct vmw_legacy_display_unit *ldu)
 {
 	list_del_init(&ldu->active);
 	vmw_display_unit_cleanup(&ldu->base);
 	kfree(ldu);
 }


 /*
  * Legacy Display Unit CRTC functions
  */

 static void vmw_ldu_crtc_destroy(struct drm_crtc *crtc)
 {
 	vmw_ldu_destroy(vmw_crtc_to_ldu(crtc));
 }

 static int vmw_ldu_commit_list(struct vmw_private *dev_priv)
 {
 	struct vmw_legacy_display *lds = dev_priv->ldu_priv;
 	struct vmw_legacy_display_unit *entry;
 	struct vmw_display_unit *du = NULL;
 	struct drm_framebuffer *fb = NULL;
 	struct drm_crtc *crtc = NULL;
 	int i = 0, ret;

 	/* If there is no display topology the host just assumes
 	 * that the guest will set the same layout as the host.
 	 */
 	if (!(dev_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY)) {
 		int w = 0, h = 0;
 		list_for_each_entry(entry, &lds->active, active) {
 			crtc = &entry->base.crtc;
 			w = max(w, crtc->x + crtc->mode.hdisplay);
 			h = max(h, crtc->y + crtc->mode.vdisplay);
 			i++;
 		}

 		if (crtc == NULL)
 			return 0;
 		fb = entry->base.crtc.fb;

 		return vmw_kms_write_svga(dev_priv, w, h, fb->pitches[0],
 					  fb->bits_per_pixel, fb->depth);
 	}

 	if (!list_empty(&lds->active)) {
 		entry = list_entry(lds->active.next, typeof(*entry), active);
 		fb = entry->base.crtc.fb;

 		vmw_kms_write_svga(dev_priv, fb->width, fb->height, fb->pitches[0],
 				   fb->bits_per_pixel, fb->depth);
 	}

 	/* Make sure we always show something. */
 	vmw_write(dev_priv, SVGA_REG_NUM_GUEST_DISPLAYS,
 		  lds->num_active ? lds->num_active : 1);

 	i = 0;
 	list_for_each_entry(entry, &lds->active, active) {
 		crtc = &entry->base.crtc;

 		vmw_write(dev_priv, SVGA_REG_DISPLAY_ID, i);
 		vmw_write(dev_priv, SVGA_REG_DISPLAY_IS_PRIMARY, !i);
 		vmw_write(dev_priv, SVGA_REG_DISPLAY_POSITION_X, crtc->x);
 		vmw_write(dev_priv, SVGA_REG_DISPLAY_POSITION_Y, crtc->y);
 		vmw_write(dev_priv, SVGA_REG_DISPLAY_WIDTH, crtc->mode.hdisplay);
 		vmw_write(dev_priv, SVGA_REG_DISPLAY_HEIGHT, crtc->mode.vdisplay);
 		vmw_write(dev_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);

 		i++;
 	}

 	BUG_ON(i != lds->num_active);

 	lds->last_num_active = lds->num_active;


 	/* Find the first du with a cursor. */
 	list_for_each_entry(entry, &lds->active, active) {
 		du = &entry->base;

 		if (!du->cursor_dmabuf)
 			continue;

 		ret = vmw_cursor_update_dmabuf(dev_priv,
 					       du->cursor_dmabuf,
 					       64, 64,
 					       du->hotspot_x,
 					       du->hotspot_y);
 		if (ret == 0)
 			break;

 		DRM_ERROR("Could not update cursor image\n");
 	}

 	return 0;
 }

 static int vmw_ldu_del_active(struct vmw_private *vmw_priv,
 			      struct vmw_legacy_display_unit *ldu)
 {
 	struct vmw_legacy_display *ld = vmw_priv->ldu_priv;
 	if (list_empty(&ldu->active))
 		return 0;

 	/* Must init otherwise list_empty(&ldu->active) will not work. */
 	list_del_init(&ldu->active);
 	if (--(ld->num_active) == 0) {
 		BUG_ON(!ld->fb);
 		if (ld->fb->unpin)
 			ld->fb->unpin(ld->fb);
 		ld->fb = NULL;
 	}

 	return 0;
 }

 static int vmw_ldu_add_active(struct vmw_private *vmw_priv,
 			      struct vmw_legacy_display_unit *ldu,
 			      struct vmw_framebuffer *vfb)
 {
 	struct vmw_legacy_display *ld = vmw_priv->ldu_priv;
 	struct vmw_legacy_display_unit *entry;
 	struct list_head *at;

 	BUG_ON(!ld->num_active && ld->fb);
 	if (vfb != ld->fb) {
 		if (ld->fb && ld->fb->unpin)
 			ld->fb->unpin(ld->fb);
 		if (vfb->pin)
 			vfb->pin(vfb);
 		ld->fb = vfb;
 	}

 	if (!list_empty(&ldu->active))
 		return 0;

 	at = &ld->active;
 	list_for_each_entry(entry, &ld->active, active) {
 		if (entry->base.unit > ldu->base.unit)
 			break;

 		at = &entry->active;
 	}

 	list_add(&ldu->active, at);

 	ld->num_active++;

 	return 0;
 }

 static int vmw_ldu_crtc_set_config(struct drm_mode_set *set)
 {
 	struct vmw_private *dev_priv;
 	struct vmw_legacy_display_unit *ldu;
 	struct drm_connector *connector;
 	struct drm_display_mode *mode;
 	struct drm_encoder *encoder;
 	struct vmw_framebuffer *vfb;
 	struct drm_framebuffer *fb;
 	struct drm_crtc *crtc;

 	if (!set)
 		return -EINVAL;

 	if (!set->crtc)
 		return -EINVAL;

 	/* get the ldu */
 	crtc = set->crtc;
 	ldu = vmw_crtc_to_ldu(crtc);
 	vfb = set->fb ? vmw_framebuffer_to_vfb(set->fb) : NULL;
 	dev_priv = vmw_priv(crtc->dev);

 	if (set->num_connectors > 1) {
 		DRM_ERROR("to many connectors\n");
 		return -EINVAL;
 	}

 	if (set->num_connectors == 1 &&
 	    set->connectors[0] != &ldu->base.connector) {
 		DRM_ERROR("connector doesn't match %p %p\n",
 			set->connectors[0], &ldu->base.connector);
 		return -EINVAL;
 	}

 	/* ldu only supports one fb active at the time */
 	if (dev_priv->ldu_priv->fb && vfb &&
 	    !(dev_priv->ldu_priv->num_active == 1 &&
 	      !list_empty(&ldu->active)) &&
 	    dev_priv->ldu_priv->fb != vfb) {
 		DRM_ERROR("Multiple framebuffers not supported\n");
 		return -EINVAL;
 	}

 	/* since they always map one to one these are safe */
 	connector = &ldu->base.connector;
 	encoder = &ldu->base.encoder;

 	/* should we turn the crtc off? */
 	if (set->num_connectors == 0 || !set->mode || !set->fb) {

 		connector->encoder = NULL;
 		encoder->crtc = NULL;
 		crtc->fb = NULL;
 		crtc->enabled = false;

 		vmw_ldu_del_active(dev_priv, ldu);

 		return vmw_ldu_commit_list(dev_priv);
 	}


 	/* we now know we want to set a mode */
 	mode = set->mode;
 	fb = set->fb;

 	if (set->x + mode->hdisplay > fb->width ||
 	    set->y + mode->vdisplay > fb->height) {
 		DRM_ERROR("set outside of framebuffer\n");
 		return -EINVAL;
 	}

 	vmw_fb_off(dev_priv);

 	crtc->fb = fb;
 	encoder->crtc = crtc;
 	connector->encoder = encoder;
 	crtc->x = set->x;
 	crtc->y = set->y;
 	crtc->mode = *mode;
 	crtc->enabled = true;

 	vmw_ldu_add_active(dev_priv, ldu, vfb);

 	return vmw_ldu_commit_list(dev_priv);
 }

 static struct drm_crtc_funcs vmw_legacy_crtc_funcs = {
 	.save = vmw_du_crtc_save,
 	.restore = vmw_du_crtc_restore,
 	.cursor_set = vmw_du_crtc_cursor_set,
 	.cursor_move = vmw_du_crtc_cursor_move,
 	.gamma_set = vmw_du_crtc_gamma_set,
 	.destroy = vmw_ldu_crtc_destroy,
 	.set_config = vmw_ldu_crtc_set_config,
 };


 /*
  * Legacy Display Unit encoder functions
  */

 static void vmw_ldu_encoder_destroy(struct drm_encoder *encoder)
 {
 	vmw_ldu_destroy(vmw_encoder_to_ldu(encoder));
 }

 static struct drm_encoder_funcs vmw_legacy_encoder_funcs = {
 	.destroy = vmw_ldu_encoder_destroy,
 };

 /*
  * Legacy Display Unit connector functions
  */

 static void vmw_ldu_connector_destroy(struct drm_connector *connector)
 {
 	vmw_ldu_destroy(vmw_connector_to_ldu(connector));
 }

 static struct drm_connector_funcs vmw_legacy_connector_funcs = {
 	.dpms = vmw_du_connector_dpms,
 	.save = vmw_du_connector_save,
 	.restore = vmw_du_connector_restore,
 	.detect = vmw_du_connector_detect,
 	.fill_modes = vmw_du_connector_fill_modes,
 	.set_property = vmw_du_connector_set_property,
 	.destroy = vmw_ldu_connector_destroy,
 };

 static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
 {
 	struct vmw_legacy_display_unit *ldu;
 	struct drm_device *dev = dev_priv->dev;
 	struct drm_connector *connector;
 	struct drm_encoder *encoder;
 	struct drm_crtc *crtc;

 	ldu = kzalloc(sizeof(*ldu), GFP_KERNEL);
 	if (!ldu)
 		return -ENOMEM;

 	ldu->base.unit = unit;
 	crtc = &ldu->base.crtc;
 	encoder = &ldu->base.encoder;
 	connector = &ldu->base.connector;

 	INIT_LIST_HEAD(&ldu->active);

 	ldu->base.pref_active = (unit == 0);
 	ldu->base.pref_width = dev_priv->initial_width;
 	ldu->base.pref_height = dev_priv->initial_height;
 	ldu->base.pref_mode = NULL;
 	ldu->base.is_implicit = true;

 	drm_connector_init(dev, connector, &vmw_legacy_connector_funcs,
 			   DRM_MODE_CONNECTOR_VIRTUAL);
 	connector->status = vmw_du_connector_detect(connector, true);

 	drm_encoder_init(dev, encoder, &vmw_legacy_encoder_funcs,
 			 DRM_MODE_ENCODER_VIRTUAL);
 	drm_mode_connector_attach_encoder(connector, encoder);
 	encoder->possible_crtcs = (1 << unit);
 	encoder->possible_clones = 0;

 	(void) drm_sysfs_connector_add(connector);

 	drm_crtc_init(dev, crtc, &vmw_legacy_crtc_funcs);

 	drm_mode_crtc_set_gamma_size(crtc, 256);

 	drm_object_attach_property(&connector->base,
 				      dev->mode_config.dirty_info_property,
 				      1);

 	return 0;
 }

 int vmw_kms_init_legacy_display_system(struct vmw_private *dev_priv)
 {
 	struct drm_device *dev = dev_priv->dev;
 	int i, ret;

 	if (dev_priv->ldu_priv) {
 		DRM_INFO("ldu system already on\n");
 		return -EINVAL;
 	}

 	dev_priv->ldu_priv = kmalloc(sizeof(*dev_priv->ldu_priv), GFP_KERNEL);
 	if (!dev_priv->ldu_priv)
 		return -ENOMEM;

 	INIT_LIST_HEAD(&dev_priv->ldu_priv->active);
 	dev_priv->ldu_priv->num_active = 0;
 	dev_priv->ldu_priv->last_num_active = 0;
 	dev_priv->ldu_priv->fb = NULL;

 	/* for old hardware without multimon only enable one display */
 	if (dev_priv->capabilities & SVGA_CAP_MULTIMON)
 		ret = drm_vblank_init(dev, VMWGFX_NUM_DISPLAY_UNITS);
 	else
 		ret = drm_vblank_init(dev, 1);
 	if (ret != 0)
 		goto err_free;

 	ret = drm_mode_create_dirty_info_property(dev);
 	if (ret != 0)
 		goto err_vblank_cleanup;

 	if (dev_priv->capabilities & SVGA_CAP_MULTIMON)
 		for (i = 0; i < VMWGFX_NUM_DISPLAY_UNITS; ++i)
 			vmw_ldu_init(dev_priv, i);
 	else
 		vmw_ldu_init(dev_priv, 0);

 	return 0;

 err_vblank_cleanup:
 	drm_vblank_cleanup(dev);
 err_free:
 	kfree(dev_priv->ldu_priv);
 	dev_priv->ldu_priv = NULL;
 	return ret;
 }

 int vmw_kms_close_legacy_display_system(struct vmw_private *dev_priv)
 {
 	struct drm_device *dev = dev_priv->dev;

 	if (!dev_priv->ldu_priv)
 		return -ENOSYS;

 	drm_vblank_cleanup(dev);

 	BUG_ON(!list_empty(&dev_priv->ldu_priv->active));

 	kfree(dev_priv->ldu_priv);

 	return 0;
 }
	/**************************************************************************
	*
	* Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
	* All Rights Reserved.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the
	* "Software"), to deal in the Software without restriction, including
	* without limitation the rights to use, copy, modify, merge, publish,
	* distribute, sub license, and/or sell copies of the Software, and to
	* permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial portions
	* of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	*
	**************************************************************************/

	#include "vmwgfx_kms.h"


	#define vmw_crtc_to_ldu(x) \
	container_of(x, struct vmw_legacy_display_unit, base.crtc)
	#define vmw_encoder_to_ldu(x) \
	container_of(x, struct vmw_legacy_display_unit, base.encoder)
	#define vmw_connector_to_ldu(x) \
	container_of(x, struct vmw_legacy_display_unit, base.connector)

	struct vmw_legacy_display {
	struct list_head active;

	unsigned num_active;
	unsigned last_num_active;

	struct vmw_framebuffer *fb;
	};

	/**
	* Display unit using the legacy register interface.
	*/
	struct vmw_legacy_display_unit {
	struct vmw_display_unit base;

	struct list_head active;
	};

	static void vmw_ldu_destroy(struct vmw_legacy_display_unit *ldu)
	{
	list_del_init(&ldu->active);
	vmw_display_unit_cleanup(&ldu->base);
	kfree(ldu);
	}


	/*
	* Legacy Display Unit CRTC functions
	*/

	static void vmw_ldu_crtc_destroy(struct drm_crtc *crtc)
	{
	vmw_ldu_destroy(vmw_crtc_to_ldu(crtc));
	}

	static int vmw_ldu_commit_list(struct vmw_private *dev_priv)
	{
	struct vmw_legacy_display *lds = dev_priv->ldu_priv;
	struct vmw_legacy_display_unit *entry;
	struct vmw_display_unit *du = NULL;
	struct drm_framebuffer *fb = NULL;
	struct drm_crtc *crtc = NULL;
	int i = 0, ret;

	/* If there is no display topology the host just assumes
	* that the guest will set the same layout as the host.
	*/
	if (!(dev_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY)) {
	int w = 0, h = 0;
	list_for_each_entry(entry, &lds->active, active) {
	crtc = &entry->base.crtc;
	w = max(w, crtc->x + crtc->mode.hdisplay);
	h = max(h, crtc->y + crtc->mode.vdisplay);
	i++;
	}

	if (crtc == NULL)
	return 0;
	fb = entry->base.crtc.fb;

	return vmw_kms_write_svga(dev_priv, w, h, fb->pitches[0],
	fb->bits_per_pixel, fb->depth);
	}

	if (!list_empty(&lds->active)) {
	entry = list_entry(lds->active.next, typeof(*entry), active);
	fb = entry->base.crtc.fb;

	vmw_kms_write_svga(dev_priv, fb->width, fb->height, fb->pitches[0],
	fb->bits_per_pixel, fb->depth);
	}

	/* Make sure we always show something. */
	vmw_write(dev_priv, SVGA_REG_NUM_GUEST_DISPLAYS,
	lds->num_active ? lds->num_active : 1);

	i = 0;
	list_for_each_entry(entry, &lds->active, active) {
	crtc = &entry->base.crtc;

	vmw_write(dev_priv, SVGA_REG_DISPLAY_ID, i);
	vmw_write(dev_priv, SVGA_REG_DISPLAY_IS_PRIMARY, !i);
	vmw_write(dev_priv, SVGA_REG_DISPLAY_POSITION_X, crtc->x);
	vmw_write(dev_priv, SVGA_REG_DISPLAY_POSITION_Y, crtc->y);
	vmw_write(dev_priv, SVGA_REG_DISPLAY_WIDTH, crtc->mode.hdisplay);
	vmw_write(dev_priv, SVGA_REG_DISPLAY_HEIGHT, crtc->mode.vdisplay);
	vmw_write(dev_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);

	i++;
	}

	BUG_ON(i != lds->num_active);

	lds->last_num_active = lds->num_active;


	/* Find the first du with a cursor. */
	list_for_each_entry(entry, &lds->active, active) {
	du = &entry->base;

	if (!du->cursor_dmabuf)
	continue;

	ret = vmw_cursor_update_dmabuf(dev_priv,
	du->cursor_dmabuf,
	64, 64,
	du->hotspot_x,
	du->hotspot_y);
	if (ret == 0)
	break;

	DRM_ERROR("Could not update cursor image\n");
	}

	return 0;
	}

	static int vmw_ldu_del_active(struct vmw_private *vmw_priv,
	struct vmw_legacy_display_unit *ldu)
	{
	struct vmw_legacy_display *ld = vmw_priv->ldu_priv;
	if (list_empty(&ldu->active))
	return 0;

	/* Must init otherwise list_empty(&ldu->active) will not work. */
	list_del_init(&ldu->active);
	if (--(ld->num_active) == 0) {
	BUG_ON(!ld->fb);
	if (ld->fb->unpin)
	ld->fb->unpin(ld->fb);
	ld->fb = NULL;
	}

	return 0;
	}

	static int vmw_ldu_add_active(struct vmw_private *vmw_priv,
	struct vmw_legacy_display_unit *ldu,
	struct vmw_framebuffer *vfb)
	{
	struct vmw_legacy_display *ld = vmw_priv->ldu_priv;
	struct vmw_legacy_display_unit *entry;
	struct list_head *at;

	BUG_ON(!ld->num_active && ld->fb);
	if (vfb != ld->fb) {
	if (ld->fb && ld->fb->unpin)
	ld->fb->unpin(ld->fb);
	if (vfb->pin)
	vfb->pin(vfb);
	ld->fb = vfb;
	}

	if (!list_empty(&ldu->active))
	return 0;

	at = &ld->active;
	list_for_each_entry(entry, &ld->active, active) {
	if (entry->base.unit > ldu->base.unit)
	break;

	at = &entry->active;
	}

	list_add(&ldu->active, at);

	ld->num_active++;

	return 0;
	}

	static int vmw_ldu_crtc_set_config(struct drm_mode_set *set)
	{
	struct vmw_private *dev_priv;
	struct vmw_legacy_display_unit *ldu;
	struct drm_connector *connector;
	struct drm_display_mode *mode;
	struct drm_encoder *encoder;
	struct vmw_framebuffer *vfb;
	struct drm_framebuffer *fb;
	struct drm_crtc *crtc;

	if (!set)
	return -EINVAL;

	if (!set->crtc)
	return -EINVAL;

	/* get the ldu */
	crtc = set->crtc;
	ldu = vmw_crtc_to_ldu(crtc);
	vfb = set->fb ? vmw_framebuffer_to_vfb(set->fb) : NULL;
	dev_priv = vmw_priv(crtc->dev);

	if (set->num_connectors > 1) {
	DRM_ERROR("to many connectors\n");
	return -EINVAL;
	}

	if (set->num_connectors == 1 &&
	set->connectors[0] != &ldu->base.connector) {
	DRM_ERROR("connector doesn't match %p %p\n",
	set->connectors[0], &ldu->base.connector);
	return -EINVAL;
	}

	/* ldu only supports one fb active at the time */
	if (dev_priv->ldu_priv->fb && vfb &&
	!(dev_priv->ldu_priv->num_active == 1 &&
	!list_empty(&ldu->active)) &&
	dev_priv->ldu_priv->fb != vfb) {
	DRM_ERROR("Multiple framebuffers not supported\n");
	return -EINVAL;
	}

	/* since they always map one to one these are safe */
	connector = &ldu->base.connector;
	encoder = &ldu->base.encoder;

	/* should we turn the crtc off? */
	if (set->num_connectors == 0 \|\| !set->mode \|\| !set->fb) {

	connector->encoder = NULL;
	encoder->crtc = NULL;
	crtc->fb = NULL;
	crtc->enabled = false;

	vmw_ldu_del_active(dev_priv, ldu);

	return vmw_ldu_commit_list(dev_priv);
	}


	/* we now know we want to set a mode */
	mode = set->mode;
	fb = set->fb;

	if (set->x + mode->hdisplay > fb->width \|\|
	set->y + mode->vdisplay > fb->height) {
	DRM_ERROR("set outside of framebuffer\n");
	return -EINVAL;
	}

	vmw_fb_off(dev_priv);

	crtc->fb = fb;
	encoder->crtc = crtc;
	connector->encoder = encoder;
	crtc->x = set->x;
	crtc->y = set->y;
	crtc->mode = *mode;
	crtc->enabled = true;

	vmw_ldu_add_active(dev_priv, ldu, vfb);

	return vmw_ldu_commit_list(dev_priv);
	}

	static struct drm_crtc_funcs vmw_legacy_crtc_funcs = {
	.save = vmw_du_crtc_save,
	.restore = vmw_du_crtc_restore,
	.cursor_set = vmw_du_crtc_cursor_set,
	.cursor_move = vmw_du_crtc_cursor_move,
	.gamma_set = vmw_du_crtc_gamma_set,
	.destroy = vmw_ldu_crtc_destroy,
	.set_config = vmw_ldu_crtc_set_config,
	};


	/*
	* Legacy Display Unit encoder functions
	*/

	static void vmw_ldu_encoder_destroy(struct drm_encoder *encoder)
	{
	vmw_ldu_destroy(vmw_encoder_to_ldu(encoder));
	}

	static struct drm_encoder_funcs vmw_legacy_encoder_funcs = {
	.destroy = vmw_ldu_encoder_destroy,
	};

	/*
	* Legacy Display Unit connector functions
	*/

	static void vmw_ldu_connector_destroy(struct drm_connector *connector)
	{
	vmw_ldu_destroy(vmw_connector_to_ldu(connector));
	}

	static struct drm_connector_funcs vmw_legacy_connector_funcs = {
	.dpms = vmw_du_connector_dpms,
	.save = vmw_du_connector_save,
	.restore = vmw_du_connector_restore,
	.detect = vmw_du_connector_detect,
	.fill_modes = vmw_du_connector_fill_modes,
	.set_property = vmw_du_connector_set_property,
	.destroy = vmw_ldu_connector_destroy,
	};

	static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
	{
	struct vmw_legacy_display_unit *ldu;
	struct drm_device *dev = dev_priv->dev;
	struct drm_connector *connector;
	struct drm_encoder *encoder;
	struct drm_crtc *crtc;

	ldu = kzalloc(sizeof(*ldu), GFP_KERNEL);
	if (!ldu)
	return -ENOMEM;

	ldu->base.unit = unit;
	crtc = &ldu->base.crtc;
	encoder = &ldu->base.encoder;
	connector = &ldu->base.connector;

	INIT_LIST_HEAD(&ldu->active);

	ldu->base.pref_active = (unit == 0);
	ldu->base.pref_width = dev_priv->initial_width;
	ldu->base.pref_height = dev_priv->initial_height;
	ldu->base.pref_mode = NULL;
	ldu->base.is_implicit = true;

	drm_connector_init(dev, connector, &vmw_legacy_connector_funcs,
	DRM_MODE_CONNECTOR_VIRTUAL);
	connector->status = vmw_du_connector_detect(connector, true);

	drm_encoder_init(dev, encoder, &vmw_legacy_encoder_funcs,
	DRM_MODE_ENCODER_VIRTUAL);
	drm_mode_connector_attach_encoder(connector, encoder);
	encoder->possible_crtcs = (1 << unit);
	encoder->possible_clones = 0;

	(void) drm_sysfs_connector_add(connector);

	drm_crtc_init(dev, crtc, &vmw_legacy_crtc_funcs);

	drm_mode_crtc_set_gamma_size(crtc, 256);

	drm_object_attach_property(&connector->base,
	dev->mode_config.dirty_info_property,
	1);

	return 0;
	}

	int vmw_kms_init_legacy_display_system(struct vmw_private *dev_priv)
	{
	struct drm_device *dev = dev_priv->dev;
	int i, ret;

	if (dev_priv->ldu_priv) {
	DRM_INFO("ldu system already on\n");
	return -EINVAL;
	}

	dev_priv->ldu_priv = kmalloc(sizeof(*dev_priv->ldu_priv), GFP_KERNEL);
	if (!dev_priv->ldu_priv)
	return -ENOMEM;

	INIT_LIST_HEAD(&dev_priv->ldu_priv->active);
	dev_priv->ldu_priv->num_active = 0;
	dev_priv->ldu_priv->last_num_active = 0;
	dev_priv->ldu_priv->fb = NULL;

	/* for old hardware without multimon only enable one display */
	if (dev_priv->capabilities & SVGA_CAP_MULTIMON)
	ret = drm_vblank_init(dev, VMWGFX_NUM_DISPLAY_UNITS);
	else
	ret = drm_vblank_init(dev, 1);
	if (ret != 0)
	goto err_free;

	ret = drm_mode_create_dirty_info_property(dev);
	if (ret != 0)
	goto err_vblank_cleanup;

	if (dev_priv->capabilities & SVGA_CAP_MULTIMON)
	for (i = 0; i < VMWGFX_NUM_DISPLAY_UNITS; ++i)
	vmw_ldu_init(dev_priv, i);
	else
	vmw_ldu_init(dev_priv, 0);

	return 0;

	err_vblank_cleanup:
	drm_vblank_cleanup(dev);
	err_free:
	kfree(dev_priv->ldu_priv);
	dev_priv->ldu_priv = NULL;
	return ret;
	}

	int vmw_kms_close_legacy_display_system(struct vmw_private *dev_priv)
	{
	struct drm_device *dev = dev_priv->dev;

	if (!dev_priv->ldu_priv)
	return -ENOSYS;

	drm_vblank_cleanup(dev);

	BUG_ON(!list_empty(&dev_priv->ldu_priv->active));

	kfree(dev_priv->ldu_priv);

	return 0;
	}