drivers/gpu/drm/qxl/qxl_fb.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright © 2013 Red Hat
  *
  * 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, sublicense,
  * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS 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.
  *
  * Authors:
  *     David Airlie
  */
 #include <linux/module.h>
 #include <linux/fb.h>

 #include "drmP.h"
 #include "drm/drm.h"
 #include "drm/drm_crtc.h"
 #include "drm/drm_crtc_helper.h"
 #include "qxl_drv.h"

 #include "qxl_object.h"
 #include "drm_fb_helper.h"

 #define QXL_DIRTY_DELAY (HZ / 30)

 #define QXL_FB_OP_FILLRECT 1
 #define QXL_FB_OP_COPYAREA 2
 #define QXL_FB_OP_IMAGEBLIT 3

 struct qxl_fb_op {
 	struct list_head head;
 	int op_type;
 	union {
 		struct fb_fillrect fr;
 		struct fb_copyarea ca;
 		struct fb_image ib;
 	} op;
 	void *img_data;
 };

 struct qxl_fbdev {
 	struct drm_fb_helper helper;
 	struct qxl_framebuffer	qfb;
 	struct list_head	fbdev_list;
 	struct qxl_device	*qdev;

 	spinlock_t delayed_ops_lock;
 	struct list_head delayed_ops;
 	void *shadow;
 	int size;

 	/* dirty memory logging */
 	struct {
 		spinlock_t lock;
 		bool active;
 		unsigned x1;
 		unsigned y1;
 		unsigned x2;
 		unsigned y2;
 	} dirty;
 };

 static void qxl_fb_image_init(struct qxl_fb_image *qxl_fb_image,
 			      struct qxl_device *qdev, struct fb_info *info,
 			      const struct fb_image *image)
 {
 	qxl_fb_image->qdev = qdev;
 	if (info) {
 		qxl_fb_image->visual = info->fix.visual;
 		if (qxl_fb_image->visual == FB_VISUAL_TRUECOLOR ||
 		    qxl_fb_image->visual == FB_VISUAL_DIRECTCOLOR)
 			memcpy(&qxl_fb_image->pseudo_palette,
 			       info->pseudo_palette,
 			       sizeof(qxl_fb_image->pseudo_palette));
 	} else {
 		 /* fallback */
 		if (image->depth == 1)
 			qxl_fb_image->visual = FB_VISUAL_MONO10;
 		else
 			qxl_fb_image->visual = FB_VISUAL_DIRECTCOLOR;
 	}
 	if (image) {
 		memcpy(&qxl_fb_image->fb_image, image,
 		       sizeof(qxl_fb_image->fb_image));
 	}
 }

 static void qxl_fb_dirty_flush(struct fb_info *info)
 {
 	struct qxl_fbdev *qfbdev = info->par;
 	struct qxl_device *qdev = qfbdev->qdev;
 	struct qxl_fb_image qxl_fb_image;
 	struct fb_image *image = &qxl_fb_image.fb_image;
 	u32 x1, x2, y1, y2;

 	/* TODO: hard coding 32 bpp */
 	int stride = qfbdev->qfb.base.pitches[0];

 	x1 = qfbdev->dirty.x1;
 	x2 = qfbdev->dirty.x2;
 	y1 = qfbdev->dirty.y1;
 	y2 = qfbdev->dirty.y2;
 	/*
 	 * we are using a shadow draw buffer, at qdev->surface0_shadow
 	 */
 	qxl_io_log(qdev, "dirty x[%d, %d], y[%d, %d]", x1, x2, y1, y2);
 	image->dx = x1;
 	image->dy = y1;
 	image->width = x2 - x1;
 	image->height = y2 - y1;
 	image->fg_color = 0xffffffff; /* unused, just to avoid uninitialized
 					 warnings */
 	image->bg_color = 0;
 	image->depth = 32;	     /* TODO: take from somewhere? */
 	image->cmap.start = 0;
 	image->cmap.len = 0;
 	image->cmap.red = NULL;
 	image->cmap.green = NULL;
 	image->cmap.blue = NULL;
 	image->cmap.transp = NULL;
 	image->data = qfbdev->shadow + (x1 * 4) + (stride * y1);

 	qxl_fb_image_init(&qxl_fb_image, qdev, info, NULL);
 	qxl_draw_opaque_fb(&qxl_fb_image, stride);
 	qfbdev->dirty.x1 = 0;
 	qfbdev->dirty.x2 = 0;
 	qfbdev->dirty.y1 = 0;
 	qfbdev->dirty.y2 = 0;
 }

 static void qxl_deferred_io(struct fb_info *info,
 			    struct list_head *pagelist)
 {
 	struct qxl_fbdev *qfbdev = info->par;
 	unsigned long start, end, min, max;
 	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;

 		/* TODO: add spin lock? */
 		/* spin_lock_irqsave(&qfbdev->dirty.lock, flags); */
 		qfbdev->dirty.x1 = 0;
 		qfbdev->dirty.y1 = y1;
 		qfbdev->dirty.x2 = info->var.xres;
 		qfbdev->dirty.y2 = y2;
 		/* spin_unlock_irqrestore(&qfbdev->dirty.lock, flags); */
 	}

 	qxl_fb_dirty_flush(info);
 };


 static struct fb_deferred_io qxl_defio = {
 	.delay		= QXL_DIRTY_DELAY,
 	.deferred_io	= qxl_deferred_io,
 };

 static void qxl_fb_delayed_fillrect(struct qxl_fbdev *qfbdev,
 				    const struct fb_fillrect *fb_rect)
 {
 	struct qxl_fb_op *op;
 	unsigned long flags;

 	op = kmalloc(sizeof(struct qxl_fb_op), GFP_ATOMIC | __GFP_NOWARN);
 	if (!op)
 		return;

 	op->op.fr = *fb_rect;
 	op->img_data = NULL;
 	op->op_type = QXL_FB_OP_FILLRECT;

 	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
 	list_add_tail(&op->head, &qfbdev->delayed_ops);
 	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
 }

 static void qxl_fb_delayed_copyarea(struct qxl_fbdev *qfbdev,
 				    const struct fb_copyarea *fb_copy)
 {
 	struct qxl_fb_op *op;
 	unsigned long flags;

 	op = kmalloc(sizeof(struct qxl_fb_op), GFP_ATOMIC | __GFP_NOWARN);
 	if (!op)
 		return;

 	op->op.ca = *fb_copy;
 	op->img_data = NULL;
 	op->op_type = QXL_FB_OP_COPYAREA;

 	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
 	list_add_tail(&op->head, &qfbdev->delayed_ops);
 	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
 }

 static void qxl_fb_delayed_imageblit(struct qxl_fbdev *qfbdev,
 				     const struct fb_image *fb_image)
 {
 	struct qxl_fb_op *op;
 	unsigned long flags;
 	uint32_t size = fb_image->width * fb_image->height * (fb_image->depth >= 8 ? fb_image->depth / 8 : 1);

 	op = kmalloc(sizeof(struct qxl_fb_op) + size, GFP_ATOMIC | __GFP_NOWARN);
 	if (!op)
 		return;

 	op->op.ib = *fb_image;
 	op->img_data = (void *)(op + 1);
 	op->op_type = QXL_FB_OP_IMAGEBLIT;

 	memcpy(op->img_data, fb_image->data, size);

 	op->op.ib.data = op->img_data;
 	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
 	list_add_tail(&op->head, &qfbdev->delayed_ops);
 	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
 }

 static void qxl_fb_fillrect_internal(struct fb_info *info,
 				     const struct fb_fillrect *fb_rect)
 {
 	struct qxl_fbdev *qfbdev = info->par;
 	struct qxl_device *qdev = qfbdev->qdev;
 	struct qxl_rect rect;
 	uint32_t color;
 	int x = fb_rect->dx;
 	int y = fb_rect->dy;
 	int width = fb_rect->width;
 	int height = fb_rect->height;
 	uint16_t rop;
 	struct qxl_draw_fill qxl_draw_fill_rec;

 	if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
 	    info->fix.visual == FB_VISUAL_DIRECTCOLOR)
 		color = ((u32 *) (info->pseudo_palette))[fb_rect->color];
 	else
 		color = fb_rect->color;
 	rect.left = x;
 	rect.right = x + width;
 	rect.top = y;
 	rect.bottom = y + height;
 	switch (fb_rect->rop) {
 	case ROP_XOR:
 		rop = SPICE_ROPD_OP_XOR;
 		break;
 	case ROP_COPY:
 		rop = SPICE_ROPD_OP_PUT;
 		break;
 	default:
 		pr_err("qxl_fb_fillrect(): unknown rop, "
 		       "defaulting to SPICE_ROPD_OP_PUT\n");
 		rop = SPICE_ROPD_OP_PUT;
 	}
 	qxl_draw_fill_rec.qdev = qdev;
 	qxl_draw_fill_rec.rect = rect;
 	qxl_draw_fill_rec.color = color;
 	qxl_draw_fill_rec.rop = rop;

 	qxl_draw_fill(&qxl_draw_fill_rec);
 }

 static void qxl_fb_fillrect(struct fb_info *info,
 			    const struct fb_fillrect *fb_rect)
 {
 	struct qxl_fbdev *qfbdev = info->par;
 	struct qxl_device *qdev = qfbdev->qdev;

 	if (!drm_can_sleep()) {
 		qxl_fb_delayed_fillrect(qfbdev, fb_rect);
 		schedule_work(&qdev->fb_work);
 		return;
 	}
 	/* make sure any previous work is done */
 	flush_work(&qdev->fb_work);
 	qxl_fb_fillrect_internal(info, fb_rect);
 }

 static void qxl_fb_copyarea_internal(struct fb_info *info,
 				     const struct fb_copyarea *region)
 {
 	struct qxl_fbdev *qfbdev = info->par;

 	qxl_draw_copyarea(qfbdev->qdev,
 			  region->width, region->height,
 			  region->sx, region->sy,
 			  region->dx, region->dy);
 }

 static void qxl_fb_copyarea(struct fb_info *info,
 			    const struct fb_copyarea *region)
 {
 	struct qxl_fbdev *qfbdev = info->par;
 	struct qxl_device *qdev = qfbdev->qdev;

 	if (!drm_can_sleep()) {
 		qxl_fb_delayed_copyarea(qfbdev, region);
 		schedule_work(&qdev->fb_work);
 		return;
 	}
 	/* make sure any previous work is done */
 	flush_work(&qdev->fb_work);
 	qxl_fb_copyarea_internal(info, region);
 }

 static void qxl_fb_imageblit_safe(struct qxl_fb_image *qxl_fb_image)
 {
 	qxl_draw_opaque_fb(qxl_fb_image, 0);
 }

 static void qxl_fb_imageblit_internal(struct fb_info *info,
 				      const struct fb_image *image)
 {
 	struct qxl_fbdev *qfbdev = info->par;
 	struct qxl_fb_image qxl_fb_image;

 	/* ensure proper order  rendering operations - TODO: must do this
 	 * for everything. */
 	qxl_fb_image_init(&qxl_fb_image, qfbdev->qdev, info, image);
 	qxl_fb_imageblit_safe(&qxl_fb_image);
 }

 static void qxl_fb_imageblit(struct fb_info *info,
 			     const struct fb_image *image)
 {
 	struct qxl_fbdev *qfbdev = info->par;
 	struct qxl_device *qdev = qfbdev->qdev;

 	if (!drm_can_sleep()) {
 		qxl_fb_delayed_imageblit(qfbdev, image);
 		schedule_work(&qdev->fb_work);
 		return;
 	}
 	/* make sure any previous work is done */
 	flush_work(&qdev->fb_work);
 	qxl_fb_imageblit_internal(info, image);
 }

 static void qxl_fb_work(struct work_struct *work)
 {
 	struct qxl_device *qdev = container_of(work, struct qxl_device, fb_work);
 	unsigned long flags;
 	struct qxl_fb_op *entry, *tmp;
 	struct qxl_fbdev *qfbdev = qdev->mode_info.qfbdev;

 	/* since the irq context just adds entries to the end of the
 	   list dropping the lock should be fine, as entry isn't modified
 	   in the operation code */
 	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
 	list_for_each_entry_safe(entry, tmp, &qfbdev->delayed_ops, head) {
 		spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
 		switch (entry->op_type) {
 		case QXL_FB_OP_FILLRECT:
 			qxl_fb_fillrect_internal(qfbdev->helper.fbdev, &entry->op.fr);
 			break;
 		case QXL_FB_OP_COPYAREA:
 			qxl_fb_copyarea_internal(qfbdev->helper.fbdev, &entry->op.ca);
 			break;
 		case QXL_FB_OP_IMAGEBLIT:
 			qxl_fb_imageblit_internal(qfbdev->helper.fbdev, &entry->op.ib);
 			break;
 		}
 		spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
 		list_del(&entry->head);
 		kfree(entry);
 	}
 	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
 }

 int qxl_fb_init(struct qxl_device *qdev)
 {
 	INIT_WORK(&qdev->fb_work, qxl_fb_work);
 	return 0;
 }

 static struct fb_ops qxlfb_ops = {
 	.owner = THIS_MODULE,
 	.fb_check_var = drm_fb_helper_check_var,
 	.fb_set_par = drm_fb_helper_set_par, /* TODO: copy vmwgfx */
 	.fb_fillrect = qxl_fb_fillrect,
 	.fb_copyarea = qxl_fb_copyarea,
 	.fb_imageblit = qxl_fb_imageblit,
 	.fb_pan_display = drm_fb_helper_pan_display,
 	.fb_blank = drm_fb_helper_blank,
 	.fb_setcmap = drm_fb_helper_setcmap,
 	.fb_debug_enter = drm_fb_helper_debug_enter,
 	.fb_debug_leave = drm_fb_helper_debug_leave,
 };

 static void qxlfb_destroy_pinned_object(struct drm_gem_object *gobj)
 {
 	struct qxl_bo *qbo = gem_to_qxl_bo(gobj);
 	int ret;

 	ret = qxl_bo_reserve(qbo, false);
 	if (likely(ret == 0)) {
 		qxl_bo_kunmap(qbo);
 		qxl_bo_unpin(qbo);
 		qxl_bo_unreserve(qbo);
 	}
 	drm_gem_object_unreference_unlocked(gobj);
 }

 int qxl_get_handle_for_primary_fb(struct qxl_device *qdev,
 				  struct drm_file *file_priv,
 				  uint32_t *handle)
 {
 	int r;
 	struct drm_gem_object *gobj = qdev->fbdev_qfb->obj;

 	BUG_ON(!gobj);
 	/* drm_get_handle_create adds a reference - good */
 	r = drm_gem_handle_create(file_priv, gobj, handle);
 	if (r)
 		return r;
 	return 0;
 }

 static int qxlfb_create_pinned_object(struct qxl_fbdev *qfbdev,
 				      struct drm_mode_fb_cmd2 *mode_cmd,
 				      struct drm_gem_object **gobj_p)
 {
 	struct qxl_device *qdev = qfbdev->qdev;
 	struct drm_gem_object *gobj = NULL;
 	struct qxl_bo *qbo = NULL;
 	int ret;
 	int aligned_size, size;
 	int height = mode_cmd->height;
 	int bpp;
 	int depth;

 	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &bpp, &depth);

 	size = mode_cmd->pitches[0] * height;
 	aligned_size = ALIGN(size, PAGE_SIZE);
 	/* TODO: unallocate and reallocate surface0 for real. Hack to just
 	 * have a large enough surface0 for 1024x768 Xorg 32bpp mode */
 	ret = qxl_gem_object_create(qdev, aligned_size, 0,
 				    QXL_GEM_DOMAIN_SURFACE,
 				    false, /* is discardable */
 				    false, /* is kernel (false means device) */
 				    NULL,
 				    &gobj);
 	if (ret) {
 		pr_err("failed to allocate framebuffer (%d)\n",
 		       aligned_size);
 		return -ENOMEM;
 	}
 	qbo = gem_to_qxl_bo(gobj);

 	qbo->surf.width = mode_cmd->width;
 	qbo->surf.height = mode_cmd->height;
 	qbo->surf.stride = mode_cmd->pitches[0];
 	qbo->surf.format = SPICE_SURFACE_FMT_32_xRGB;
 	ret = qxl_bo_reserve(qbo, false);
 	if (unlikely(ret != 0))
 		goto out_unref;
 	ret = qxl_bo_pin(qbo, QXL_GEM_DOMAIN_SURFACE, NULL);
 	if (ret) {
 		qxl_bo_unreserve(qbo);
 		goto out_unref;
 	}
 	ret = qxl_bo_kmap(qbo, NULL);
 	qxl_bo_unreserve(qbo); /* unreserve, will be mmaped */
 	if (ret)
 		goto out_unref;

 	*gobj_p = gobj;
 	return 0;
 out_unref:
 	qxlfb_destroy_pinned_object(gobj);
 	*gobj_p = NULL;
 	return ret;
 }

 static int qxlfb_create(struct qxl_fbdev *qfbdev,
 			struct drm_fb_helper_surface_size *sizes)
 {
 	struct qxl_device *qdev = qfbdev->qdev;
 	struct fb_info *info;
 	struct drm_framebuffer *fb = NULL;
 	struct drm_mode_fb_cmd2 mode_cmd;
 	struct drm_gem_object *gobj = NULL;
 	struct qxl_bo *qbo = NULL;
 	struct device *device = &qdev->pdev->dev;
 	int ret;
 	int size;
 	int bpp = sizes->surface_bpp;
 	int depth = sizes->surface_depth;
 	void *shadow;

 	mode_cmd.width = sizes->surface_width;
 	mode_cmd.height = sizes->surface_height;

 	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * ((bpp + 1) / 8), 64);
 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);

 	ret = qxlfb_create_pinned_object(qfbdev, &mode_cmd, &gobj);
 	qbo = gem_to_qxl_bo(gobj);
 	QXL_INFO(qdev, "%s: %dx%d %d\n", __func__, mode_cmd.width,
 		 mode_cmd.height, mode_cmd.pitches[0]);

 	shadow = vmalloc(mode_cmd.pitches[0] * mode_cmd.height);
 	/* TODO: what's the usual response to memory allocation errors? */
 	BUG_ON(!shadow);
 	QXL_INFO(qdev,
 	"surface0 at gpu offset %lld, mmap_offset %lld (virt %p, shadow %p)\n",
 		 qxl_bo_gpu_offset(qbo),
 		 qxl_bo_mmap_offset(qbo),
 		 qbo->kptr,
 		 shadow);
 	size = mode_cmd.pitches[0] * mode_cmd.height;

 	info = framebuffer_alloc(0, device);
 	if (info == NULL) {
 		ret = -ENOMEM;
 		goto out_unref;
 	}

 	info->par = qfbdev;

 	qxl_framebuffer_init(qdev->ddev, &qfbdev->qfb, &mode_cmd, gobj);

 	fb = &qfbdev->qfb.base;

 	/* setup helper with fb data */
 	qfbdev->helper.fb = fb;
 	qfbdev->helper.fbdev = info;
 	qfbdev->shadow = shadow;
 	strcpy(info->fix.id, "qxldrmfb");

 	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);

 	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT;
 	info->fbops = &qxlfb_ops;

 	/*
 	 * TODO: using gobj->size in various places in this function. Not sure
 	 * what the difference between the different sizes is.
 	 */
 	info->fix.smem_start = qdev->vram_base; /* TODO - correct? */
 	info->fix.smem_len = gobj->size;
 	info->screen_base = qfbdev->shadow;
 	info->screen_size = gobj->size;

 	drm_fb_helper_fill_var(info, &qfbdev->helper, sizes->fb_width,
 			       sizes->fb_height);

 	/* setup aperture base/size for vesafb takeover */
 	info->apertures = alloc_apertures(1);
 	if (!info->apertures) {
 		ret = -ENOMEM;
 		goto out_unref;
 	}
 	info->apertures->ranges[0].base = qdev->ddev->mode_config.fb_base;
 	info->apertures->ranges[0].size = qdev->vram_size;

 	info->fix.mmio_start = 0;
 	info->fix.mmio_len = 0;

 	if (info->screen_base == NULL) {
 		ret = -ENOSPC;
 		goto out_unref;
 	}

 	ret = fb_alloc_cmap(&info->cmap, 256, 0);
 	if (ret) {
 		ret = -ENOMEM;
 		goto out_unref;
 	}

 	info->fbdefio = &qxl_defio;
 	fb_deferred_io_init(info);

 	qdev->fbdev_info = info;
 	qdev->fbdev_qfb = &qfbdev->qfb;
 	DRM_INFO("fb mappable at 0x%lX, size %lu\n",  info->fix.smem_start, (unsigned long)info->screen_size);
 	DRM_INFO("fb: depth %d, pitch %d, width %d, height %d\n", fb->depth, fb->pitches[0], fb->width, fb->height);
 	return 0;

 out_unref:
 	if (qbo) {
 		ret = qxl_bo_reserve(qbo, false);
 		if (likely(ret == 0)) {
 			qxl_bo_kunmap(qbo);
 			qxl_bo_unpin(qbo);
 			qxl_bo_unreserve(qbo);
 		}
 	}
 	if (fb && ret) {
 		drm_gem_object_unreference(gobj);
 		drm_framebuffer_cleanup(fb);
 		kfree(fb);
 	}
 	drm_gem_object_unreference(gobj);
 	return ret;
 }

 static int qxl_fb_find_or_create_single(
 		struct drm_fb_helper *helper,
 		struct drm_fb_helper_surface_size *sizes)
 {
 	struct qxl_fbdev *qfbdev = (struct qxl_fbdev *)helper;
 	int new_fb = 0;
 	int ret;

 	if (!helper->fb) {
 		ret = qxlfb_create(qfbdev, sizes);
 		if (ret)
 			return ret;
 		new_fb = 1;
 	}
 	return new_fb;
 }

 static int qxl_fbdev_destroy(struct drm_device *dev, struct qxl_fbdev *qfbdev)
 {
 	struct fb_info *info;
 	struct qxl_framebuffer *qfb = &qfbdev->qfb;

 	if (qfbdev->helper.fbdev) {
 		info = qfbdev->helper.fbdev;

 		unregister_framebuffer(info);
 		framebuffer_release(info);
 	}
 	if (qfb->obj) {
 		qxlfb_destroy_pinned_object(qfb->obj);
 		qfb->obj = NULL;
 	}
 	drm_fb_helper_fini(&qfbdev->helper);
 	vfree(qfbdev->shadow);
 	drm_framebuffer_cleanup(&qfb->base);

 	return 0;
 }

 static struct drm_fb_helper_funcs qxl_fb_helper_funcs = {
 	.fb_probe = qxl_fb_find_or_create_single,
 };

 int qxl_fbdev_init(struct qxl_device *qdev)
 {
 	struct qxl_fbdev *qfbdev;
 	int bpp_sel = 32; /* TODO: parameter from somewhere? */
 	int ret;

 	qfbdev = kzalloc(sizeof(struct qxl_fbdev), GFP_KERNEL);
 	if (!qfbdev)
 		return -ENOMEM;

 	qfbdev->qdev = qdev;
 	qdev->mode_info.qfbdev = qfbdev;
 	qfbdev->helper.funcs = &qxl_fb_helper_funcs;
 	spin_lock_init(&qfbdev->delayed_ops_lock);
 	INIT_LIST_HEAD(&qfbdev->delayed_ops);
 	ret = drm_fb_helper_init(qdev->ddev, &qfbdev->helper,
 				 qxl_num_crtc /* num_crtc - QXL supports just 1 */,
 				 QXLFB_CONN_LIMIT);
 	if (ret) {
 		kfree(qfbdev);
 		return ret;
 	}

 	drm_fb_helper_single_add_all_connectors(&qfbdev->helper);
 	drm_fb_helper_initial_config(&qfbdev->helper, bpp_sel);
 	return 0;
 }

 void qxl_fbdev_fini(struct qxl_device *qdev)
 {
 	if (!qdev->mode_info.qfbdev)
 		return;

 	qxl_fbdev_destroy(qdev->ddev, qdev->mode_info.qfbdev);
 	kfree(qdev->mode_info.qfbdev);
 	qdev->mode_info.qfbdev = NULL;
 }

 void qxl_fbdev_set_suspend(struct qxl_device *qdev, int state)
 {
 	fb_set_suspend(qdev->mode_info.qfbdev->helper.fbdev, state);
 }

 bool qxl_fbdev_qobj_is_fb(struct qxl_device *qdev, struct qxl_bo *qobj)
 {
 	if (qobj == gem_to_qxl_bo(qdev->mode_info.qfbdev->qfb.obj))
 		return true;
 	return false;
 }
	/*
	* Copyright © 2013 Red Hat
	*
	* 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, sublicense,
	* 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 NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS 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.
	*
	* Authors:
	* David Airlie
	*/
	#include <linux/module.h>
	#include <linux/fb.h>

	#include "drmP.h"
	#include "drm/drm.h"
	#include "drm/drm_crtc.h"
	#include "drm/drm_crtc_helper.h"
	#include "qxl_drv.h"

	#include "qxl_object.h"
	#include "drm_fb_helper.h"

	#define QXL_DIRTY_DELAY (HZ / 30)

	#define QXL_FB_OP_FILLRECT 1
	#define QXL_FB_OP_COPYAREA 2
	#define QXL_FB_OP_IMAGEBLIT 3

	struct qxl_fb_op {
	struct list_head head;
	int op_type;
	union {
	struct fb_fillrect fr;
	struct fb_copyarea ca;
	struct fb_image ib;
	} op;
	void *img_data;
	};

	struct qxl_fbdev {
	struct drm_fb_helper helper;
	struct qxl_framebuffer qfb;
	struct list_head fbdev_list;
	struct qxl_device *qdev;

	spinlock_t delayed_ops_lock;
	struct list_head delayed_ops;
	void *shadow;
	int size;

	/* dirty memory logging */
	struct {
	spinlock_t lock;
	bool active;
	unsigned x1;
	unsigned y1;
	unsigned x2;
	unsigned y2;
	} dirty;
	};

	static void qxl_fb_image_init(struct qxl_fb_image *qxl_fb_image,
	struct qxl_device qdev, struct fb_info info,
	const struct fb_image *image)
	{
	qxl_fb_image->qdev = qdev;
	if (info) {
	qxl_fb_image->visual = info->fix.visual;
	if (qxl_fb_image->visual == FB_VISUAL_TRUECOLOR \|\|
	qxl_fb_image->visual == FB_VISUAL_DIRECTCOLOR)
	memcpy(&qxl_fb_image->pseudo_palette,
	info->pseudo_palette,
	sizeof(qxl_fb_image->pseudo_palette));
	} else {
	/* fallback */
	if (image->depth == 1)
	qxl_fb_image->visual = FB_VISUAL_MONO10;
	else
	qxl_fb_image->visual = FB_VISUAL_DIRECTCOLOR;
	}
	if (image) {
	memcpy(&qxl_fb_image->fb_image, image,
	sizeof(qxl_fb_image->fb_image));
	}
	}

	static void qxl_fb_dirty_flush(struct fb_info *info)
	{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;
	struct qxl_fb_image qxl_fb_image;
	struct fb_image *image = &qxl_fb_image.fb_image;
	u32 x1, x2, y1, y2;

	/* TODO: hard coding 32 bpp */
	int stride = qfbdev->qfb.base.pitches[0];

	x1 = qfbdev->dirty.x1;
	x2 = qfbdev->dirty.x2;
	y1 = qfbdev->dirty.y1;
	y2 = qfbdev->dirty.y2;
	/*
	* we are using a shadow draw buffer, at qdev->surface0_shadow
	*/
	qxl_io_log(qdev, "dirty x[%d, %d], y[%d, %d]", x1, x2, y1, y2);
	image->dx = x1;
	image->dy = y1;
	image->width = x2 - x1;
	image->height = y2 - y1;
	image->fg_color = 0xffffffff; /* unused, just to avoid uninitialized
	warnings */
	image->bg_color = 0;
	image->depth = 32; /* TODO: take from somewhere? */
	image->cmap.start = 0;
	image->cmap.len = 0;
	image->cmap.red = NULL;
	image->cmap.green = NULL;
	image->cmap.blue = NULL;
	image->cmap.transp = NULL;
	image->data = qfbdev->shadow + (x1 * 4) + (stride * y1);

	qxl_fb_image_init(&qxl_fb_image, qdev, info, NULL);
	qxl_draw_opaque_fb(&qxl_fb_image, stride);
	qfbdev->dirty.x1 = 0;
	qfbdev->dirty.x2 = 0;
	qfbdev->dirty.y1 = 0;
	qfbdev->dirty.y2 = 0;
	}

	static void qxl_deferred_io(struct fb_info *info,
	struct list_head *pagelist)
	{
	struct qxl_fbdev *qfbdev = info->par;
	unsigned long start, end, min, max;
	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;

	/* TODO: add spin lock? */
	/* spin_lock_irqsave(&qfbdev->dirty.lock, flags); */
	qfbdev->dirty.x1 = 0;
	qfbdev->dirty.y1 = y1;
	qfbdev->dirty.x2 = info->var.xres;
	qfbdev->dirty.y2 = y2;
	/* spin_unlock_irqrestore(&qfbdev->dirty.lock, flags); */
	}

	qxl_fb_dirty_flush(info);
	};


	static struct fb_deferred_io qxl_defio = {
	.delay = QXL_DIRTY_DELAY,
	.deferred_io = qxl_deferred_io,
	};

	static void qxl_fb_delayed_fillrect(struct qxl_fbdev *qfbdev,
	const struct fb_fillrect *fb_rect)
	{
	struct qxl_fb_op *op;
	unsigned long flags;

	op = kmalloc(sizeof(struct qxl_fb_op), GFP_ATOMIC \| __GFP_NOWARN);
	if (!op)
	return;

	op->op.fr = *fb_rect;
	op->img_data = NULL;
	op->op_type = QXL_FB_OP_FILLRECT;

	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_add_tail(&op->head, &qfbdev->delayed_ops);
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
	}

	static void qxl_fb_delayed_copyarea(struct qxl_fbdev *qfbdev,
	const struct fb_copyarea *fb_copy)
	{
	struct qxl_fb_op *op;
	unsigned long flags;

	op = kmalloc(sizeof(struct qxl_fb_op), GFP_ATOMIC \| __GFP_NOWARN);
	if (!op)
	return;

	op->op.ca = *fb_copy;
	op->img_data = NULL;
	op->op_type = QXL_FB_OP_COPYAREA;

	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_add_tail(&op->head, &qfbdev->delayed_ops);
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
	}

	static void qxl_fb_delayed_imageblit(struct qxl_fbdev *qfbdev,
	const struct fb_image *fb_image)
	{
	struct qxl_fb_op *op;
	unsigned long flags;
	uint32_t size = fb_image->width * fb_image->height * (fb_image->depth >= 8 ? fb_image->depth / 8 : 1);

	op = kmalloc(sizeof(struct qxl_fb_op) + size, GFP_ATOMIC \| __GFP_NOWARN);
	if (!op)
	return;

	op->op.ib = *fb_image;
	op->img_data = (void *)(op + 1);
	op->op_type = QXL_FB_OP_IMAGEBLIT;

	memcpy(op->img_data, fb_image->data, size);

	op->op.ib.data = op->img_data;
	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_add_tail(&op->head, &qfbdev->delayed_ops);
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
	}

	static void qxl_fb_fillrect_internal(struct fb_info *info,
	const struct fb_fillrect *fb_rect)
	{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;
	struct qxl_rect rect;
	uint32_t color;
	int x = fb_rect->dx;
	int y = fb_rect->dy;
	int width = fb_rect->width;
	int height = fb_rect->height;
	uint16_t rop;
	struct qxl_draw_fill qxl_draw_fill_rec;

	if (info->fix.visual == FB_VISUAL_TRUECOLOR \|\|
	info->fix.visual == FB_VISUAL_DIRECTCOLOR)
	color = ((u32 *) (info->pseudo_palette))[fb_rect->color];
	else
	color = fb_rect->color;
	rect.left = x;
	rect.right = x + width;
	rect.top = y;
	rect.bottom = y + height;
	switch (fb_rect->rop) {
	case ROP_XOR:
	rop = SPICE_ROPD_OP_XOR;
	break;
	case ROP_COPY:
	rop = SPICE_ROPD_OP_PUT;
	break;
	default:
	pr_err("qxl_fb_fillrect(): unknown rop, "
	"defaulting to SPICE_ROPD_OP_PUT\n");
	rop = SPICE_ROPD_OP_PUT;
	}
	qxl_draw_fill_rec.qdev = qdev;
	qxl_draw_fill_rec.rect = rect;
	qxl_draw_fill_rec.color = color;
	qxl_draw_fill_rec.rop = rop;

	qxl_draw_fill(&qxl_draw_fill_rec);
	}

	static void qxl_fb_fillrect(struct fb_info *info,
	const struct fb_fillrect *fb_rect)
	{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;

	if (!drm_can_sleep()) {
	qxl_fb_delayed_fillrect(qfbdev, fb_rect);
	schedule_work(&qdev->fb_work);
	return;
	}
	/* make sure any previous work is done */
	flush_work(&qdev->fb_work);
	qxl_fb_fillrect_internal(info, fb_rect);
	}

	static void qxl_fb_copyarea_internal(struct fb_info *info,
	const struct fb_copyarea *region)
	{
	struct qxl_fbdev *qfbdev = info->par;

	qxl_draw_copyarea(qfbdev->qdev,
	region->width, region->height,
	region->sx, region->sy,
	region->dx, region->dy);
	}

	static void qxl_fb_copyarea(struct fb_info *info,
	const struct fb_copyarea *region)
	{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;

	if (!drm_can_sleep()) {
	qxl_fb_delayed_copyarea(qfbdev, region);
	schedule_work(&qdev->fb_work);
	return;
	}
	/* make sure any previous work is done */
	flush_work(&qdev->fb_work);
	qxl_fb_copyarea_internal(info, region);
	}

	static void qxl_fb_imageblit_safe(struct qxl_fb_image *qxl_fb_image)
	{
	qxl_draw_opaque_fb(qxl_fb_image, 0);
	}

	static void qxl_fb_imageblit_internal(struct fb_info *info,
	const struct fb_image *image)
	{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_fb_image qxl_fb_image;

	/* ensure proper order rendering operations - TODO: must do this
	* for everything. */
	qxl_fb_image_init(&qxl_fb_image, qfbdev->qdev, info, image);
	qxl_fb_imageblit_safe(&qxl_fb_image);
	}

	static void qxl_fb_imageblit(struct fb_info *info,
	const struct fb_image *image)
	{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;

	if (!drm_can_sleep()) {
	qxl_fb_delayed_imageblit(qfbdev, image);
	schedule_work(&qdev->fb_work);
	return;
	}
	/* make sure any previous work is done */
	flush_work(&qdev->fb_work);
	qxl_fb_imageblit_internal(info, image);
	}

	static void qxl_fb_work(struct work_struct *work)
	{
	struct qxl_device *qdev = container_of(work, struct qxl_device, fb_work);
	unsigned long flags;
	struct qxl_fb_op entry, tmp;
	struct qxl_fbdev *qfbdev = qdev->mode_info.qfbdev;

	/* since the irq context just adds entries to the end of the
	list dropping the lock should be fine, as entry isn't modified
	in the operation code */
	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_for_each_entry_safe(entry, tmp, &qfbdev->delayed_ops, head) {
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
	switch (entry->op_type) {
	case QXL_FB_OP_FILLRECT:
	qxl_fb_fillrect_internal(qfbdev->helper.fbdev, &entry->op.fr);
	break;
	case QXL_FB_OP_COPYAREA:
	qxl_fb_copyarea_internal(qfbdev->helper.fbdev, &entry->op.ca);
	break;
	case QXL_FB_OP_IMAGEBLIT:
	qxl_fb_imageblit_internal(qfbdev->helper.fbdev, &entry->op.ib);
	break;
	}
	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_del(&entry->head);
	kfree(entry);
	}
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
	}

	int qxl_fb_init(struct qxl_device *qdev)
	{
	INIT_WORK(&qdev->fb_work, qxl_fb_work);
	return 0;
	}

	static struct fb_ops qxlfb_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = drm_fb_helper_check_var,
	.fb_set_par = drm_fb_helper_set_par, /* TODO: copy vmwgfx */
	.fb_fillrect = qxl_fb_fillrect,
	.fb_copyarea = qxl_fb_copyarea,
	.fb_imageblit = qxl_fb_imageblit,
	.fb_pan_display = drm_fb_helper_pan_display,
	.fb_blank = drm_fb_helper_blank,
	.fb_setcmap = drm_fb_helper_setcmap,
	.fb_debug_enter = drm_fb_helper_debug_enter,
	.fb_debug_leave = drm_fb_helper_debug_leave,
	};

	static void qxlfb_destroy_pinned_object(struct drm_gem_object *gobj)
	{
	struct qxl_bo *qbo = gem_to_qxl_bo(gobj);
	int ret;

	ret = qxl_bo_reserve(qbo, false);
	if (likely(ret == 0)) {
	qxl_bo_kunmap(qbo);
	qxl_bo_unpin(qbo);
	qxl_bo_unreserve(qbo);
	}
	drm_gem_object_unreference_unlocked(gobj);
	}

	int qxl_get_handle_for_primary_fb(struct qxl_device *qdev,
	struct drm_file *file_priv,
	uint32_t *handle)
	{
	int r;
	struct drm_gem_object *gobj = qdev->fbdev_qfb->obj;

	BUG_ON(!gobj);
	/* drm_get_handle_create adds a reference - good */
	r = drm_gem_handle_create(file_priv, gobj, handle);
	if (r)
	return r;
	return 0;
	}

	static int qxlfb_create_pinned_object(struct qxl_fbdev *qfbdev,
	struct drm_mode_fb_cmd2 *mode_cmd,
	struct drm_gem_object **gobj_p)
	{
	struct qxl_device *qdev = qfbdev->qdev;
	struct drm_gem_object *gobj = NULL;
	struct qxl_bo *qbo = NULL;
	int ret;
	int aligned_size, size;
	int height = mode_cmd->height;
	int bpp;
	int depth;

	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &bpp, &depth);

	size = mode_cmd->pitches[0] * height;
	aligned_size = ALIGN(size, PAGE_SIZE);
	/* TODO: unallocate and reallocate surface0 for real. Hack to just
	* have a large enough surface0 for 1024x768 Xorg 32bpp mode */
	ret = qxl_gem_object_create(qdev, aligned_size, 0,
	QXL_GEM_DOMAIN_SURFACE,
	false, /* is discardable */
	false, /* is kernel (false means device) */
	NULL,
	&gobj);
	if (ret) {
	pr_err("failed to allocate framebuffer (%d)\n",
	aligned_size);
	return -ENOMEM;
	}
	qbo = gem_to_qxl_bo(gobj);

	qbo->surf.width = mode_cmd->width;
	qbo->surf.height = mode_cmd->height;
	qbo->surf.stride = mode_cmd->pitches[0];
	qbo->surf.format = SPICE_SURFACE_FMT_32_xRGB;
	ret = qxl_bo_reserve(qbo, false);
	if (unlikely(ret != 0))
	goto out_unref;
	ret = qxl_bo_pin(qbo, QXL_GEM_DOMAIN_SURFACE, NULL);
	if (ret) {
	qxl_bo_unreserve(qbo);
	goto out_unref;
	}
	ret = qxl_bo_kmap(qbo, NULL);
	qxl_bo_unreserve(qbo); /* unreserve, will be mmaped */
	if (ret)
	goto out_unref;

	*gobj_p = gobj;
	return 0;
	out_unref:
	qxlfb_destroy_pinned_object(gobj);
	*gobj_p = NULL;
	return ret;
	}

	static int qxlfb_create(struct qxl_fbdev *qfbdev,
	struct drm_fb_helper_surface_size *sizes)
	{
	struct qxl_device *qdev = qfbdev->qdev;
	struct fb_info *info;
	struct drm_framebuffer *fb = NULL;
	struct drm_mode_fb_cmd2 mode_cmd;
	struct drm_gem_object *gobj = NULL;
	struct qxl_bo *qbo = NULL;
	struct device *device = &qdev->pdev->dev;
	int ret;
	int size;
	int bpp = sizes->surface_bpp;
	int depth = sizes->surface_depth;
	void *shadow;

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;

	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * ((bpp + 1) / 8), 64);
	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);

	ret = qxlfb_create_pinned_object(qfbdev, &mode_cmd, &gobj);
	qbo = gem_to_qxl_bo(gobj);
	QXL_INFO(qdev, "%s: %dx%d %d\n", __func__, mode_cmd.width,
	mode_cmd.height, mode_cmd.pitches[0]);

	shadow = vmalloc(mode_cmd.pitches[0] * mode_cmd.height);
	/* TODO: what's the usual response to memory allocation errors? */
	BUG_ON(!shadow);
	QXL_INFO(qdev,
	"surface0 at gpu offset %lld, mmap_offset %lld (virt %p, shadow %p)\n",
	qxl_bo_gpu_offset(qbo),
	qxl_bo_mmap_offset(qbo),
	qbo->kptr,
	shadow);
	size = mode_cmd.pitches[0] * mode_cmd.height;

	info = framebuffer_alloc(0, device);
	if (info == NULL) {
	ret = -ENOMEM;
	goto out_unref;
	}

	info->par = qfbdev;

	qxl_framebuffer_init(qdev->ddev, &qfbdev->qfb, &mode_cmd, gobj);

	fb = &qfbdev->qfb.base;

	/* setup helper with fb data */
	qfbdev->helper.fb = fb;
	qfbdev->helper.fbdev = info;
	qfbdev->shadow = shadow;
	strcpy(info->fix.id, "qxldrmfb");

	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);

	info->flags = FBINFO_DEFAULT \| FBINFO_HWACCEL_COPYAREA \| FBINFO_HWACCEL_FILLRECT;
	info->fbops = &qxlfb_ops;

	/*
	* TODO: using gobj->size in various places in this function. Not sure
	* what the difference between the different sizes is.
	*/
	info->fix.smem_start = qdev->vram_base; /* TODO - correct? */
	info->fix.smem_len = gobj->size;
	info->screen_base = qfbdev->shadow;
	info->screen_size = gobj->size;

	drm_fb_helper_fill_var(info, &qfbdev->helper, sizes->fb_width,
	sizes->fb_height);

	/* setup aperture base/size for vesafb takeover */
	info->apertures = alloc_apertures(1);
	if (!info->apertures) {
	ret = -ENOMEM;
	goto out_unref;
	}
	info->apertures->ranges[0].base = qdev->ddev->mode_config.fb_base;
	info->apertures->ranges[0].size = qdev->vram_size;

	info->fix.mmio_start = 0;
	info->fix.mmio_len = 0;

	if (info->screen_base == NULL) {
	ret = -ENOSPC;
	goto out_unref;
	}

	ret = fb_alloc_cmap(&info->cmap, 256, 0);
	if (ret) {
	ret = -ENOMEM;
	goto out_unref;
	}

	info->fbdefio = &qxl_defio;
	fb_deferred_io_init(info);

	qdev->fbdev_info = info;
	qdev->fbdev_qfb = &qfbdev->qfb;
	DRM_INFO("fb mappable at 0x%lX, size %lu\n", info->fix.smem_start, (unsigned long)info->screen_size);
	DRM_INFO("fb: depth %d, pitch %d, width %d, height %d\n", fb->depth, fb->pitches[0], fb->width, fb->height);
	return 0;

	out_unref:
	if (qbo) {
	ret = qxl_bo_reserve(qbo, false);
	if (likely(ret == 0)) {
	qxl_bo_kunmap(qbo);
	qxl_bo_unpin(qbo);
	qxl_bo_unreserve(qbo);
	}
	}
	if (fb && ret) {
	drm_gem_object_unreference(gobj);
	drm_framebuffer_cleanup(fb);
	kfree(fb);
	}
	drm_gem_object_unreference(gobj);
	return ret;
	}

	static int qxl_fb_find_or_create_single(
	struct drm_fb_helper *helper,
	struct drm_fb_helper_surface_size *sizes)
	{
	struct qxl_fbdev qfbdev = (struct qxl_fbdev )helper;
	int new_fb = 0;
	int ret;

	if (!helper->fb) {
	ret = qxlfb_create(qfbdev, sizes);
	if (ret)
	return ret;
	new_fb = 1;
	}
	return new_fb;
	}

	static int qxl_fbdev_destroy(struct drm_device dev, struct qxl_fbdev qfbdev)
	{
	struct fb_info *info;
	struct qxl_framebuffer *qfb = &qfbdev->qfb;

	if (qfbdev->helper.fbdev) {
	info = qfbdev->helper.fbdev;

	unregister_framebuffer(info);
	framebuffer_release(info);
	}
	if (qfb->obj) {
	qxlfb_destroy_pinned_object(qfb->obj);
	qfb->obj = NULL;
	}
	drm_fb_helper_fini(&qfbdev->helper);
	vfree(qfbdev->shadow);
	drm_framebuffer_cleanup(&qfb->base);

	return 0;
	}

	static struct drm_fb_helper_funcs qxl_fb_helper_funcs = {
	.fb_probe = qxl_fb_find_or_create_single,
	};

	int qxl_fbdev_init(struct qxl_device *qdev)
	{
	struct qxl_fbdev *qfbdev;
	int bpp_sel = 32; /* TODO: parameter from somewhere? */
	int ret;

	qfbdev = kzalloc(sizeof(struct qxl_fbdev), GFP_KERNEL);
	if (!qfbdev)
	return -ENOMEM;

	qfbdev->qdev = qdev;
	qdev->mode_info.qfbdev = qfbdev;
	qfbdev->helper.funcs = &qxl_fb_helper_funcs;
	spin_lock_init(&qfbdev->delayed_ops_lock);
	INIT_LIST_HEAD(&qfbdev->delayed_ops);
	ret = drm_fb_helper_init(qdev->ddev, &qfbdev->helper,
	qxl_num_crtc /* num_crtc - QXL supports just 1 */,
	QXLFB_CONN_LIMIT);
	if (ret) {
	kfree(qfbdev);
	return ret;
	}

	drm_fb_helper_single_add_all_connectors(&qfbdev->helper);
	drm_fb_helper_initial_config(&qfbdev->helper, bpp_sel);
	return 0;
	}

	void qxl_fbdev_fini(struct qxl_device *qdev)
	{
	if (!qdev->mode_info.qfbdev)
	return;

	qxl_fbdev_destroy(qdev->ddev, qdev->mode_info.qfbdev);
	kfree(qdev->mode_info.qfbdev);
	qdev->mode_info.qfbdev = NULL;
	}

	void qxl_fbdev_set_suspend(struct qxl_device *qdev, int state)
	{
	fb_set_suspend(qdev->mode_info.qfbdev->helper.fbdev, state);
	}

	bool qxl_fbdev_qobj_is_fb(struct qxl_device qdev, struct qxl_bo qobj)
	{
	if (qobj == gem_to_qxl_bo(qdev->mode_info.qfbdev->qfb.obj))
	return true;
	return false;
	}