text: /**************************************************************************
   *
   * Copyright © 2007 David Airlie
   * Copyright © 2009-2015 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 <linux/pci.h>
  
  #include <drm/drm_fourcc.h>
  #include <drm/ttm/ttm_placement.h>
  
  #include "vmwgfx_drv.h"
  #include "vmwgfx_kms.h"
  
  #define VMW_DIRTY_DELAY (HZ / 30)
  
  struct vmw_fb_par {
  	struct vmw_private *vmw_priv;
  
  	void *vmalloc;
  
  	struct mutex bo_mutex;
  	struct vmw_buffer_object *vmw_bo;
  	unsigned bo_size;
  	struct drm_framebuffer *set_fb;
  	struct drm_display_mode *set_mode;
  	u32 fb_x;
  	u32 fb_y;
  	bool bo_iowrite;
  
  	u32 pseudo_palette[17];
  
  	unsigned max_width;
  	unsigned max_height;
  
  	struct {
  		spinlock_t lock;
  		bool active;
  		unsigned x1;
  		unsigned y1;
  		unsigned x2;
  		unsigned y2;
  	} dirty;
  
  	struct drm_crtc *crtc;
  	struct drm_connector *con;
  	struct delayed_work local_work;
  };
  
  static int vmw_fb_setcolreg(unsigned regno, unsigned red, unsigned green,
  			    unsigned blue, unsigned transp,
  			    struct fb_info *info)
  {
  	struct vmw_fb_par *par = info->par;
  	u32 *pal = par->pseudo_palette;
  
  	if (regno > 15) {
  		DRM_ERROR("Bad regno %u.\n", regno);
  		return 1;
  	}
  
  	switch (par->set_fb->format->depth) {
  	case 24:
  	case 32:
  		pal[regno] = ((red & 0xff00) << 8) |
  			      (green & 0xff00) |
  			     ((blue  & 0xff00) >> 8);
  		break;
  	default:
  		DRM_ERROR("Bad depth %u, bpp %u.\n",
  			  par->set_fb->format->depth,
  			  par->set_fb->format->cpp[0] * 8);
  		return 1;
  	}
  
  	return 0;
  }
  
  static int vmw_fb_check_var(struct fb_var_screeninfo *var,
  			    struct fb_info *info)
  {
  	int depth = var->bits_per_pixel;
  	struct vmw_fb_par *par = info->par;
  	struct vmw_private *vmw_priv = par->vmw_priv;
  
  	switch (var->bits_per_pixel) {
  	case 32:
  		depth = (var->transp.length > 0) ? 32 : 24;
  		break;
  	default:
  		DRM_ERROR("Bad bpp %u.\n", var->bits_per_pixel);
  		return -EINVAL;
  	}
  
  	switch (depth) {
  	case 24:
  		var->red.offset = 16;
  		var->green.offset = 8;
  		var->blue.offset = 0;
  		var->red.length = 8;
  		var->green.length = 8;
  		var->blue.length = 8;
  		var->transp.length = 0;
  		var->transp.offset = 0;
  		break;
  	case 32:
  		var->red.offset = 16;
  		var->green.offset = 8;
  		var->blue.offset = 0;
  		var->red.length = 8;
  		var->green.length = 8;
  		var->blue.length = 8;
  		var->transp.length = 8;
  		var->transp.offset = 24;
  		break;
  	default:
  		DRM_ERROR("Bad depth %u.\n", depth);
  		return -EINVAL;
  	}
  
  	if ((var->xoffset + var->xres) > par->max_width ||
  	    (var->yoffset + var->yres) > par->max_height) {
  		DRM_ERROR("Requested geom can not fit in framebuffer\n");
  		return -EINVAL;
  	}
  
  	if (!vmw_kms_validate_mode_vram(vmw_priv,
  					var->xres * var->bits_per_pixel/8,
  					var->yoffset + var->yres)) {
  		DRM_ERROR("Requested geom can not fit in framebuffer\n");
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int vmw_fb_blank(int blank, struct fb_info *info)
  {
  	return 0;
  }
  
  /**
   * vmw_fb_dirty_flush - flush dirty regions to the kms framebuffer
   *
   * @work: The struct work_struct associated with this task.
   *
   * This function flushes the dirty regions of the vmalloc framebuffer to the
   * kms framebuffer, and if the kms framebuffer is visible, also updated the
   * corresponding displays. Note that this function runs even if the kms
   * framebuffer is not bound to a crtc and thus not visible, but it's turned
   * off during hibernation using the par->dirty.active bool.
   */
  static void vmw_fb_dirty_flush(struct work_struct *work)
  {
  	struct vmw_fb_par *par = container_of(work, struct vmw_fb_par,
  					      local_work.work);
  	struct vmw_private *vmw_priv = par->vmw_priv;
  	struct fb_info *info = vmw_priv->fb_info;
  	unsigned long irq_flags;
  	s32 dst_x1, dst_x2, dst_y1, dst_y2, w = 0, h = 0;
  	u32 cpp, max_x, max_y;
  	struct drm_clip_rect clip;
  	struct drm_framebuffer *cur_fb;
  	u8 *src_ptr, *dst_ptr;
  	struct vmw_buffer_object *vbo = par->vmw_bo;
  	void *virtual;
  
  	if (!READ_ONCE(par->dirty.active))
  		return;
  
  	mutex_lock(&par->bo_mutex);
  	cur_fb = par->set_fb;
  	if (!cur_fb)
  		goto out_unlock;
  
  	(void) ttm_bo_reserve(&vbo->base, false, false, NULL);
  	virtual = vmw_bo_map_and_cache(vbo);
  	if (!virtual)
  		goto out_unreserve;
  
  	spin_lock_irqsave(&par->dirty.lock, irq_flags);
  	if (!par->dirty.active) {
  		spin_unlock_irqrestore(&par->dirty.lock, irq_flags);
  		goto out_unreserve;
  	}
  
  	/*
  	 * Handle panning when copying from vmalloc to framebuffer.
  	 * Clip dirty area to framebuffer.
  	 */
  	cpp = cur_fb->format->cpp[0];
  	max_x = par->fb_x + cur_fb->width;
  	max_y = par->fb_y + cur_fb->height;
  
  	dst_x1 = par->dirty.x1 - par->fb_x;
  	dst_y1 = par->dirty.y1 - par->fb_y;
  	dst_x1 = max_t(s32, dst_x1, 0);
  	dst_y1 = max_t(s32, dst_y1, 0);
  
  	dst_x2 = par->dirty.x2 - par->fb_x;
  	dst_y2 = par->dirty.y2 - par->fb_y;
  	dst_x2 = min_t(s32, dst_x2, max_x);
  	dst_y2 = min_t(s32, dst_y2, max_y);
  	w = dst_x2 - dst_x1;
  	h = dst_y2 - dst_y1;
  	w = max_t(s32, 0, w);
  	h = max_t(s32, 0, h);
  
  	par->dirty.x1 = par->dirty.x2 = 0;
  	par->dirty.y1 = par->dirty.y2 = 0;
  	spin_unlock_irqrestore(&par->dirty.lock, irq_flags);
  
  	if (w && h) {
  		dst_ptr = (u8 *)virtual  +
  			(dst_y1 * par->set_fb->pitches[0] + dst_x1 * cpp);
  		src_ptr = (u8 *)par->vmalloc +
  			((dst_y1 + par->fb_y) * info->fix.line_length +
  			 (dst_x1 + par->fb_x) * cpp);
  
  		while (h-- > 0) {
  			memcpy(dst_ptr, src_ptr, w*cpp);
  			dst_ptr += par->set_fb->pitches[0];
  			src_ptr += info->fix.line_length;
  		}
  
  		clip.x1 = dst_x1;
  		clip.x2 = dst_x2;
  		clip.y1 = dst_y1;
  		clip.y2 = dst_y2;
  	}
  
  out_unreserve:
  	ttm_bo_unreserve(&vbo->base);
  	if (w && h) {
  		WARN_ON_ONCE(par->set_fb->funcs->dirty(cur_fb, NULL, 0, 0,
  						       &clip, 1));
  		vmw_cmd_flush(vmw_priv, false);
  	}
  out_unlock:
  	mutex_unlock(&par->bo_mutex);
  }
  
  static void vmw_fb_dirty_mark(struct vmw_fb_par *par,
  			      unsigned x1, unsigned y1,
  			      unsigned width, unsigned height)
  {
  	unsigned long flags;
  	unsigned x2 = x1 + width;
  	unsigned y2 = y1 + height;
  
  	spin_lock_irqsave(&par->dirty.lock, flags);
  	if (par->dirty.x1 == par->dirty.x2) {
  		par->dirty.x1 = x1;
  		par->dirty.y1 = y1;
  		par->dirty.x2 = x2;
  		par->dirty.y2 = y2;
  		/* if we are active start the dirty work
  		 * we share the work with the defio system */
  		if (par->dirty.active)
  			schedule_delayed_work(&par->local_work,
  					      VMW_DIRTY_DELAY);
  	} else {
  		if (x1 < par->dirty.x1)
  			par->dirty.x1 = x1;
  		if (y1 < par->dirty.y1)
  			par->dirty.y1 = y1;
  		if (x2 > par->dirty.x2)
  			par->dirty.x2 = x2;
  		if (y2 > par->dirty.y2)
  			par->dirty.y2 = y2;
  	}
  	spin_unlock_irqrestore(&par->dirty.lock, flags);
  }
  
  static int vmw_fb_pan_display(struct fb_var_screeninfo *var,
  			      struct fb_info *info)
  {
  	struct vmw_fb_par *par = info->par;
  
  	if ((var->xoffset + var->xres) > var->xres_virtual ||
  	    (var->yoffset + var->yres) > var->yres_virtual) {
  		DRM_ERROR("Requested panning can not fit in framebuffer\n");
  		return -EINVAL;
  	}
  
  	mutex_lock(&par->bo_mutex);
  	par->fb_x = var->xoffset;
  	par->fb_y = var->yoffset;
  	if (par->set_fb)
  		vmw_fb_dirty_mark(par, par->fb_x, par->fb_y, par->set_fb->width,
  				  par->set_fb->height);
  	mutex_unlock(&par->bo_mutex);
  
  	return 0;
  }
  
  static void vmw_deferred_io(struct fb_info *info,
  			    struct list_head *pagelist)
  {
  	struct vmw_fb_par *par = info->par;
  	unsigned long start, end, min, max;
  	unsigned long flags;
  	struct page *page;
  	int y1, y2;
  
  	min = ULONG_MAX;
  	max = 0;
  	list_for_each_entry(page, pagelist, lru) {
  		start = page->index << PAGE_SHIFT;
  		end = start + PAGE_SIZE - 1;
  		min = min(min, start);
  		max = max(max, end);
  	}
  
  	if (min < max) {
  		y1 = min / info->fix.line_length;
  		y2 = (max / info->fix.line_length) + 1;
  
  		spin_lock_irqsave(&par->dirty.lock, flags);
  		par->dirty.x1 = 0;
  		par->dirty.y1 = y1;
  		par->dirty.x2 = info->var.xres;
  		par->dirty.y2 = y2;
  		spin_unlock_irqrestore(&par->dirty.lock, flags);
  
  		/*
  		 * Since we've already waited on this work once, try to
  		 * execute asap.
  		 */
  		cancel_delayed_work(&par->local_work);
  		schedule_delayed_work(&par->local_work, 0);
  	}
  };
  
  static struct fb_deferred_io vmw_defio = {
  	.delay		= VMW_DIRTY_DELAY,
  	.deferred_io	= vmw_deferred_io,
  };
  
  /*
   * Draw code
   */
  
  static void vmw_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
  {
  	cfb_fillrect(info, rect);
  	vmw_fb_dirty_mark(info->par, rect->dx, rect->dy,
  			  rect->width, rect->height);
  }
  
  static void vmw_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
  {
  	cfb_copyarea(info, region);
  	vmw_fb_dirty_mark(info->par, region->dx, region->dy,
  			  region->width, region->height);
  }
  
  static void vmw_fb_imageblit(struct fb_info *info, const struct fb_image *image)
  {
  	cfb_imageblit(info, image);
  	vmw_fb_dirty_mark(info->par, image->dx, image->dy,
  			  image->width, image->height);
  }
  
  /*
   * Bring up code
   */
  
  static int vmw_fb_create_bo(struct vmw_private *vmw_priv,
  			    size_t size, struct vmw_buffer_object **out)
  {
  	struct vmw_buffer_object *vmw_bo;
  	int ret;
  
  	vmw_bo = kmalloc(sizeof(*vmw_bo), GFP_KERNEL);
  	if (!vmw_bo) {
  		ret = -ENOMEM;
  		goto err_unlock;
  	}
  
  	ret = vmw_bo_init(vmw_priv, vmw_bo, size,
  			      &vmw_sys_placement,
  			      false, false,
  			      &vmw_bo_bo_free);
  	if (unlikely(ret != 0))
  		goto err_unlock; /* init frees the buffer on failure */
  
  	*out = vmw_bo;
  
  err_unlock:
  	return ret;
  }
  
  static int vmw_fb_compute_depth(struct fb_var_screeninfo *var,
  				int *depth)
  {
  	switch (var->bits_per_pixel) {
  	case 32:
  		*depth = (var->transp.length > 0) ? 32 : 24;
  		break;
  	default:
  		DRM_ERROR("Bad bpp %u.\n", var->bits_per_pixel);
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int vmwgfx_set_config_internal(struct drm_mode_set *set)
  {
  	struct drm_crtc *crtc = set->crtc;
  	struct drm_modeset_acquire_ctx ctx;
  	int ret;
  
  	drm_modeset_acquire_init(&ctx, 0);
  
  restart:
  	ret = crtc->funcs->set_config(set, &ctx);
  
  	if (ret == -EDEADLK) {
  		drm_modeset_backoff(&ctx);
  		goto restart;
  	}
  
  	drm_modeset_drop_locks(&ctx);
  	drm_modeset_acquire_fini(&ctx);
  
  	return ret;
  }
  
  static int vmw_fb_kms_detach(struct vmw_fb_par *par,
  			     bool detach_bo,
  			     bool unref_bo)
  {
  	struct drm_framebuffer *cur_fb = par->set_fb;
  	int ret;
  
  	/* Detach the KMS framebuffer from crtcs */
  	if (par->set_mode) {
  		struct drm_mode_set set;
  
  		set.crtc = par->crtc;
  		set.x = 0;
  		set.y = 0;
  		set.mode = NULL;
  		set.fb = NULL;
  		set.num_connectors = 0;
  		set.connectors = &par->con;
  		ret = vmwgfx_set_config_internal(&set);
  		if (ret) {
  			DRM_ERROR("Could not unset a mode.\n");
  			return ret;
  		}
  		drm_mode_destroy(&par->vmw_priv->drm, par->set_mode);
  		par->set_mode = NULL;
  	}
  
  	if (cur_fb) {
  		drm_framebuffer_put(cur_fb);
  		par->set_fb = NULL;
  	}
  
  	if (par->vmw_bo && detach_bo && unref_bo)
  		vmw_bo_unreference(&par->vmw_bo);
  
  	return 0;
  }
  
  static int vmw_fb_kms_framebuffer(struct fb_info *info)
  {
  	struct drm_mode_fb_cmd2 mode_cmd;
  	struct vmw_fb_par *par = info->par;
  	struct fb_var_screeninfo *var = &info->var;
  	struct drm_framebuffer *cur_fb;
  	struct vmw_framebuffer *vfb;
  	int ret = 0, depth;
  	size_t new_bo_size;
  
  	ret = vmw_fb_compute_depth(var, &depth);
  	if (ret)
  		return ret;
  
  	mode_cmd.width = var->xres;
  	mode_cmd.height = var->yres;
  	mode_cmd.pitches[0] = ((var->bits_per_pixel + 7) / 8) * mode_cmd.width;
  	mode_cmd.pixel_format =
  		drm_mode_legacy_fb_format(var->bits_per_pixel, depth);
  
  	cur_fb = par->set_fb;
  	if (cur_fb && cur_fb->width == mode_cmd.width &&
  	    cur_fb->height == mode_cmd.height &&
  	    cur_fb->format->format == mode_cmd.pixel_format &&
  	    cur_fb->pitches[0] == mode_cmd.pitches[0])
  		return 0;
  
  	/* Need new buffer object ? */
  	new_bo_size = (size_t) mode_cmd.pitches[0] * (size_t) mode_cmd.height;
  	ret = vmw_fb_kms_detach(par,
  				par->bo_size < new_bo_size ||
  				par->bo_size > 2*new_bo_size,
  				true);
  	if (ret)
  		return ret;
  
  	if (!par->vmw_bo) {
  		ret = vmw_fb_create_bo(par->vmw_priv, new_bo_size,
  				       &par->vmw_bo);
  		if (ret) {
  			DRM_ERROR("Failed creating a buffer object for "
  				  "fbdev.\n");
  			return ret;
  		}
  		par->bo_size = new_bo_size;
  	}
  
  	vfb = vmw_kms_new_framebuffer(par->vmw_priv, par->vmw_bo, NULL,
  				      true, &mode_cmd);
  	if (IS_ERR(vfb))
  		return PTR_ERR(vfb);
  
  	par->set_fb = &vfb->base;
  
  	return 0;
  }
  
  static int vmw_fb_set_par(struct fb_info *info)
  {
  	struct vmw_fb_par *par = info->par;
  	struct vmw_private *vmw_priv = par->vmw_priv;
  	struct drm_mode_set set;
  	struct fb_var_screeninfo *var = &info->var;
  	struct drm_display_mode new_mode = { DRM_MODE("fb_mode",
  		DRM_MODE_TYPE_DRIVER,
  		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  		DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC)
  	};
  	struct drm_display_mode *mode;
  	int ret;
  
  	mode = drm_mode_duplicate(&vmw_priv->drm, &new_mode);
  	if (!mode) {
  		DRM_ERROR("Could not create new fb mode.\n");
  		return -ENOMEM;
  	}
  
  	mode->hdisplay = var->xres;
  	mode->vdisplay = var->yres;
  	vmw_guess_mode_timing(mode);
  
  	if (!vmw_kms_validate_mode_vram(vmw_priv,
  					mode->hdisplay *
  					DIV_ROUND_UP(var->bits_per_pixel, 8),
  					mode->vdisplay)) {
  		drm_mode_destroy(&vmw_priv->drm, mode);
  		return -EINVAL;
  	}
  
  	mutex_lock(&par->bo_mutex);
  	ret = vmw_fb_kms_framebuffer(info);
  	if (ret)
  		goto out_unlock;
  
  	par->fb_x = var->xoffset;
  	par->fb_y = var->yoffset;
  
  	set.crtc = par->crtc;
  	set.x = 0;
  	set.y = 0;
  	set.mode = mode;
  	set.fb = par->set_fb;
  	set.num_connectors = 1;
  	set.connectors = &par->con;
  
  	ret = vmwgfx_set_config_internal(&set);
  	if (ret)
  		goto out_unlock;
  
  	vmw_fb_dirty_mark(par, par->fb_x, par->fb_y,
  			  par->set_fb->width, par->set_fb->height);
  
  	/* If there already was stuff dirty we wont
  	 * schedule a new work, so lets do it now */
  
  	schedule_delayed_work(&par->local_work, 0);
  
  out_unlock:
  	if (par->set_mode)
  		drm_mode_destroy(&vmw_priv->drm, par->set_mode);
  	par->set_mode = mode;
  
  	mutex_unlock(&par->bo_mutex);
  
  	return ret;
  }
  
  
  static const struct fb_ops vmw_fb_ops = {
  	.owner = THIS_MODULE,
  	.fb_check_var = vmw_fb_check_var,
  	.fb_set_par = vmw_fb_set_par,
  	.fb_setcolreg = vmw_fb_setcolreg,
  	.fb_fillrect = vmw_fb_fillrect,
  	.fb_copyarea = vmw_fb_copyarea,
  	.fb_imageblit = vmw_fb_imageblit,
  	.fb_pan_display = vmw_fb_pan_display,
  	.fb_blank = vmw_fb_blank,
  };
  
  int vmw_fb_init(struct vmw_private *vmw_priv)
  {
  	struct device *device = vmw_priv->drm.dev;
  	struct vmw_fb_par *par;
  	struct fb_info *info;
  	unsigned fb_width, fb_height;
  	unsigned int fb_bpp, fb_pitch, fb_size;
  	struct drm_display_mode *init_mode;
  	int ret;
  
  	fb_bpp = 32;
  
  	/* XXX As shouldn't these be as well. */
  	fb_width = min(vmw_priv->fb_max_width, (unsigned)2048);
  	fb_height = min(vmw_priv->fb_max_height, (unsigned)2048);
  
  	fb_pitch = fb_width * fb_bpp / 8;
  	fb_size = fb_pitch * fb_height;
  
  	info = framebuffer_alloc(sizeof(*par), device);
  	if (!info)
  		return -ENOMEM;
  
  	/*
  	 * Par
  	 */
  	vmw_priv->fb_info = info;
  	par = info->par;
  	memset(par, 0, sizeof(*par));
  	INIT_DELAYED_WORK(&par->local_work, &vmw_fb_dirty_flush);
  	par->vmw_priv = vmw_priv;
  	par->vmalloc = NULL;
  	par->max_width = fb_width;
  	par->max_height = fb_height;
  
  	ret = vmw_kms_fbdev_init_data(vmw_priv, 0, par->max_width,
  				      par->max_height, &par->con,
  				      &par->crtc, &init_mode);
  	if (ret)
  		goto err_kms;
  
  	info->var.xres = init_mode->hdisplay;
  	info->var.yres = init_mode->vdisplay;
  
  	/*
  	 * Create buffers and alloc memory
  	 */
  	par->vmalloc = vzalloc(fb_size);
  	if (unlikely(par->vmalloc == NULL)) {
  		ret = -ENOMEM;
  		goto err_free;
  	}
  
  	/*
  	 * Fixed and var
  	 */
  	strcpy(info->fix.id, "svgadrmfb");
  	info->fix.type = FB_TYPE_PACKED_PIXELS;
  	info->fix.visual = FB_VISUAL_TRUECOLOR;
  	info->fix.type_aux = 0;
  	info->fix.xpanstep = 1; /* doing it in hw */
  	info->fix.ypanstep = 1; /* doing it in hw */
  	info->fix.ywrapstep = 0;
  	info->fix.accel = FB_ACCEL_NONE;
  	info->fix.line_length = fb_pitch;
  
  	info->fix.smem_start = 0;
  	info->fix.smem_len = fb_size;
  
  	info->pseudo_palette = par->pseudo_palette;
  	info->screen_base = (char __iomem *)par->vmalloc;
  	info->screen_size = fb_size;
  
  	info->fbops = &vmw_fb_ops;
  
  	/* 24 depth per default */
  	info->var.red.offset = 16;
  	info->var.green.offset = 8;
  	info->var.blue.offset = 0;
  	info->var.red.length = 8;
  	info->var.green.length = 8;
  	info->var.blue.length = 8;
  	info->var.transp.offset = 0;
  	info->var.transp.length = 0;
  
  	info->var.xres_virtual = fb_width;
  	info->var.yres_virtual = fb_height;
  	info->var.bits_per_pixel = fb_bpp;
  	info->var.xoffset = 0;
  	info->var.yoffset = 0;
  	info->var.activate = FB_ACTIVATE_NOW;
  	info->var.height = -1;
  	info->var.width = -1;
  
  	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
  	info->apertures = alloc_apertures(1);
  	if (!info->apertures) {
  		ret = -ENOMEM;
  		goto err_aper;
  	}
  	info->apertures->ranges[0].base = vmw_priv->vram_start;
  	info->apertures->ranges[0].size = vmw_priv->vram_size;
  
  	/*
  	 * Dirty & Deferred IO
  	 */
  	par->dirty.x1 = par->dirty.x2 = 0;
  	par->dirty.y1 = par->dirty.y2 = 0;
  	par->dirty.active = true;
  	spin_lock_init(&par->dirty.lock);
  	mutex_init(&par->bo_mutex);
  	info->fbdefio = &vmw_defio;
  	fb_deferred_io_init(info);
  
  	ret = register_framebuffer(info);
  	if (unlikely(ret != 0))
  		goto err_defio;
  
  	vmw_fb_set_par(info);
  
  	return 0;
  
  err_defio:
  	fb_deferred_io_cleanup(info);
  err_aper:
  err_free:
  	vfree(par->vmalloc);
  err_kms:
  	framebuffer_release(info);
  	vmw_priv->fb_info = NULL;
  
  	return ret;
  }
  
  int vmw_fb_close(struct vmw_private *vmw_priv)
  {
  	struct fb_info *info;
  	struct vmw_fb_par *par;
  
  	if (!vmw_priv->fb_info)
  		return 0;
  
  	info = vmw_priv->fb_info;
  	par = info->par;
  
  	/* ??? order */
  	fb_deferred_io_cleanup(info);
  	cancel_delayed_work_sync(&par->local_work);
  	unregister_framebuffer(info);
  
  	mutex_lock(&par->bo_mutex);
  	(void) vmw_fb_kms_detach(par, true, true);
  	mutex_unlock(&par->bo_mutex);
  
  	vfree(par->vmalloc);
  	framebuffer_release(info);
  
  	return 0;
  }
  
  int vmw_fb_off(struct vmw_private *vmw_priv)
  {
  	struct fb_info *info;
  	struct vmw_fb_par *par;
  	unsigned long flags;
  
  	if (!vmw_priv->fb_info)
  		return -EINVAL;
  
  	info = vmw_priv->fb_info;
  	par = info->par;
  
  	spin_lock_irqsave(&par->dirty.lock, flags);
  	par->dirty.active = false;
  	spin_unlock_irqrestore(&par->dirty.lock, flags);
  
  	flush_delayed_work(&info->deferred_work);
  	flush_delayed_work(&par->local_work);
  
  	return 0;
  }
  
  int vmw_fb_on(struct vmw_private *vmw_priv)
  {
  	struct fb_info *info;
  	struct vmw_fb_par *par;
  	unsigned long flags;
  
  	if (!vmw_priv->fb_info)
  		return -EINVAL;
  
  	info = vmw_priv->fb_info;
  	par = info->par;
  
  	spin_lock_irqsave(&par->dirty.lock, flags);
  	par->dirty.active = true;
  	spin_unlock_irqrestore(&par->dirty.lock, flags);
  
  	/*
  	 * Need to reschedule a dirty update, because otherwise that's
  	 * only done in dirty_mark() if the previous coalesced
  	 * dirty region was empty.
  	 */
  	schedule_delayed_work(&par->local_work, 0);
  
  	return 0;
  }
  