/**************************************************************************
 *
 * 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 "vmwgfx_kms.h"


/* Might need a hrtimer here? */
#define VMWGFX_PRESENT_RATE ((HZ / 60 > 0) ? HZ / 60 : 1)

void vmw_du_cleanup(struct vmw_display_unit *du)
{
        if (du->cursor_surface)
                vmw_surface_unreference(&du->cursor_surface);
        if (du->cursor_dmabuf)
                vmw_dmabuf_unreference(&du->cursor_dmabuf);
        drm_connector_unregister(&du->connector);
        drm_crtc_cleanup(&du->crtc);
        drm_encoder_cleanup(&du->encoder);
        drm_connector_cleanup(&du->connector);
}

/*
 * Display Unit Cursor functions
 */

int vmw_cursor_update_image(struct vmw_private *dev_priv,
                            u32 *image, u32 width, u32 height,
                            u32 hotspotX, u32 hotspotY)
{
        struct {
                u32 cmd;
                SVGAFifoCmdDefineAlphaCursor cursor;
        } *cmd;
        u32 image_size = width * height * 4;
        u32 cmd_size = sizeof(*cmd) + image_size;

        if (!image)
                return -EINVAL;

        cmd = vmw_fifo_reserve(dev_priv, cmd_size);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Fifo reserve failed.\n");
                return -ENOMEM;
        }

        memset(cmd, 0, sizeof(*cmd));

        memcpy(&cmd[1], image, image_size);

        cmd->cmd = SVGA_CMD_DEFINE_ALPHA_CURSOR;
        cmd->cursor.id = 0;
        cmd->cursor.width = width;
        cmd->cursor.height = height;
        cmd->cursor.hotspotX = hotspotX;
        cmd->cursor.hotspotY = hotspotY;

        vmw_fifo_commit_flush(dev_priv, cmd_size);

        return 0;
}

int vmw_cursor_update_dmabuf(struct vmw_private *dev_priv,
                             struct vmw_dma_buffer *dmabuf,
                             u32 width, u32 height,
                             u32 hotspotX, u32 hotspotY)
{
        struct ttm_bo_kmap_obj map;
        unsigned long kmap_offset;
        unsigned long kmap_num;
        void *virtual;
        bool dummy;
        int ret;

        kmap_offset = 0;
        kmap_num = (width*height*4 + PAGE_SIZE - 1) >> PAGE_SHIFT;

        ret = ttm_bo_reserve(&dmabuf->base, true, false, false, NULL);
        if (unlikely(ret != 0)) {
                DRM_ERROR("reserve failed\n");
                return -EINVAL;
        }

        ret = ttm_bo_kmap(&dmabuf->base, kmap_offset, kmap_num, &map);
        if (unlikely(ret != 0))
                goto err_unreserve;

        virtual = ttm_kmap_obj_virtual(&map, &dummy);
        ret = vmw_cursor_update_image(dev_priv, virtual, width, height,
                                      hotspotX, hotspotY);

        ttm_bo_kunmap(&map);
err_unreserve:
        ttm_bo_unreserve(&dmabuf->base);

        return ret;
}


void vmw_cursor_update_position(struct vmw_private *dev_priv,
                                bool show, int x, int y)
{
        u32 *fifo_mem = dev_priv->mmio_virt;
        uint32_t count;

        vmw_mmio_write(show ? 1 : 0, fifo_mem + SVGA_FIFO_CURSOR_ON);
        vmw_mmio_write(x, fifo_mem + SVGA_FIFO_CURSOR_X);
        vmw_mmio_write(y, fifo_mem + SVGA_FIFO_CURSOR_Y);
        count = vmw_mmio_read(fifo_mem + SVGA_FIFO_CURSOR_COUNT);
        vmw_mmio_write(++count, fifo_mem + SVGA_FIFO_CURSOR_COUNT);
}


/*
 * vmw_du_crtc_cursor_set2 - Driver cursor_set2 callback.
 */
int vmw_du_crtc_cursor_set2(struct drm_crtc *crtc, struct drm_file *file_priv,
                            uint32_t handle, uint32_t width, uint32_t height,
                            int32_t hot_x, int32_t hot_y)
{
        struct vmw_private *dev_priv = vmw_priv(crtc->dev);
        struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
        struct vmw_surface *surface = NULL;
        struct vmw_dma_buffer *dmabuf = NULL;
        s32 hotspot_x, hotspot_y;
        int ret;

        /*
         * FIXME: Unclear whether there's any global state touched by the
         * cursor_set function, especially vmw_cursor_update_position looks
         * suspicious. For now take the easy route and reacquire all locks. We
         * can do this since the caller in the drm core doesn't check anything
         * which is protected by any looks.
         */
        drm_modeset_unlock_crtc(crtc);
        drm_modeset_lock_all(dev_priv->dev);
        hotspot_x = hot_x + du->hotspot_x;
        hotspot_y = hot_y + du->hotspot_y;

        /* A lot of the code assumes this */
        if (handle && (width != 64 || height != 64)) {
                ret = -EINVAL;
                goto out;
        }

        if (handle) {
                struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

                ret = vmw_user_lookup_handle(dev_priv, tfile,
                                             handle, &surface, &dmabuf);
                if (ret) {
                        DRM_ERROR("failed to find surface or dmabuf: %i\n", ret);
                        ret = -EINVAL;
                        goto out;
                }
        }

        /* need to do this before taking down old image */
        if (surface && !surface->snooper.image) {
                DRM_ERROR("surface not suitable for cursor\n");
                vmw_surface_unreference(&surface);
                ret = -EINVAL;
                goto out;
        }

        /* takedown old cursor */
        if (du->cursor_surface) {
                du->cursor_surface->snooper.crtc = NULL;
                vmw_surface_unreference(&du->cursor_surface);
        }
        if (du->cursor_dmabuf)
                vmw_dmabuf_unreference(&du->cursor_dmabuf);

        /* setup new image */
        ret = 0;
        if (surface) {
                /* vmw_user_surface_lookup takes one reference */
                du->cursor_surface = surface;

                du->cursor_surface->snooper.crtc = crtc;
                du->cursor_age = du->cursor_surface->snooper.age;
                ret = vmw_cursor_update_image(dev_priv, surface->snooper.image,
                                              64, 64, hotspot_x, hotspot_y);
        } else if (dmabuf) {
                /* vmw_user_surface_lookup takes one reference */
                du->cursor_dmabuf = dmabuf;

                ret = vmw_cursor_update_dmabuf(dev_priv, dmabuf, width, height,
                                               hotspot_x, hotspot_y);
        } else {
                vmw_cursor_update_position(dev_priv, false, 0, 0);
                goto out;
        }

        if (!ret) {
                vmw_cursor_update_position(dev_priv, true,
                                           du->cursor_x + hotspot_x,
                                           du->cursor_y + hotspot_y);
                du->core_hotspot_x = hot_x;
                du->core_hotspot_y = hot_y;
        }

out:
        drm_modeset_unlock_all(dev_priv->dev);
        drm_modeset_lock_crtc(crtc, crtc->cursor);

        return ret;
}

int vmw_du_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
{
        struct vmw_private *dev_priv = vmw_priv(crtc->dev);
        struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
        bool shown = du->cursor_surface || du->cursor_dmabuf ? true : false;

        du->cursor_x = x + du->set_gui_x;
        du->cursor_y = y + du->set_gui_y;

        /*
         * FIXME: Unclear whether there's any global state touched by the
         * cursor_set function, especially vmw_cursor_update_position looks
         * suspicious. For now take the easy route and reacquire all locks. We
         * can do this since the caller in the drm core doesn't check anything
         * which is protected by any looks.
         */
        drm_modeset_unlock_crtc(crtc);
        drm_modeset_lock_all(dev_priv->dev);

        vmw_cursor_update_position(dev_priv, shown,
                                   du->cursor_x + du->hotspot_x +
                                   du->core_hotspot_x,
                                   du->cursor_y + du->hotspot_y +
                                   du->core_hotspot_y);

        drm_modeset_unlock_all(dev_priv->dev);
        drm_modeset_lock_crtc(crtc, crtc->cursor);

        return 0;
}

void vmw_kms_cursor_snoop(struct vmw_surface *srf,
                          struct ttm_object_file *tfile,
                          struct ttm_buffer_object *bo,
                          SVGA3dCmdHeader *header)
{
        struct ttm_bo_kmap_obj map;
        unsigned long kmap_offset;
        unsigned long kmap_num;
        SVGA3dCopyBox *box;
        unsigned box_count;
        void *virtual;
        bool dummy;
        struct vmw_dma_cmd {
                SVGA3dCmdHeader header;
                SVGA3dCmdSurfaceDMA dma;
        } *cmd;
        int i, ret;

        cmd = container_of(header, struct vmw_dma_cmd, header);

        /* No snooper installed */
        if (!srf->snooper.image)
                return;

        if (cmd->dma.host.face != 0 || cmd->dma.host.mipmap != 0) {
                DRM_ERROR("face and mipmap for cursors should never != 0\n");
                return;
        }

        if (cmd->header.size < 64) {
                DRM_ERROR("at least one full copy box must be given\n");
                return;
        }

        box = (SVGA3dCopyBox *)&cmd[1];
        box_count = (cmd->header.size - sizeof(SVGA3dCmdSurfaceDMA)) /
                        sizeof(SVGA3dCopyBox);

        if (cmd->dma.guest.ptr.offset % PAGE_SIZE ||
            box->x != 0    || box->y != 0    || box->z != 0    ||
            box->srcx != 0 || box->srcy != 0 || box->srcz != 0 ||
            box->d != 1    || box_count != 1) {
                /* TODO handle none page aligned offsets */
                /* TODO handle more dst & src != 0 */
                /* TODO handle more then one copy */
                DRM_ERROR("Cant snoop dma request for cursor!\n");
                DRM_ERROR("(%u, %u, %u) (%u, %u, %u) (%ux%ux%u) %u %u\n",
                          box->srcx, box->srcy, box->srcz,
                          box->x, box->y, box->z,
                          box->w, box->h, box->d, box_count,
                          cmd->dma.guest.ptr.offset);
                return;
        }

        kmap_offset = cmd->dma.guest.ptr.offset >> PAGE_SHIFT;
        kmap_num = (64*64*4) >> PAGE_SHIFT;

        ret = ttm_bo_reserve(bo, true, false, false, NULL);
        if (unlikely(ret != 0)) {
                DRM_ERROR("reserve failed\n");
                return;
        }

        ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map);
        if (unlikely(ret != 0))
                goto err_unreserve;

        virtual = ttm_kmap_obj_virtual(&map, &dummy);

        if (box->w == 64 && cmd->dma.guest.pitch == 64*4) {
                memcpy(srf->snooper.image, virtual, 64*64*4);
        } else {
                /* Image is unsigned pointer. */
                for (i = 0; i < box->h; i++)
                        memcpy(srf->snooper.image + i * 64,
                               virtual + i * cmd->dma.guest.pitch,
                               box->w * 4);
        }

        srf->snooper.age++;

        ttm_bo_kunmap(&map);
err_unreserve:
        ttm_bo_unreserve(bo);
}

/**
 * vmw_kms_legacy_hotspot_clear - Clear legacy hotspots
 *
 * @dev_priv: Pointer to the device private struct.
 *
 * Clears all legacy hotspots.
 */
void vmw_kms_legacy_hotspot_clear(struct vmw_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;
        struct vmw_display_unit *du;
        struct drm_crtc *crtc;

        drm_modeset_lock_all(dev);
        drm_for_each_crtc(crtc, dev) {
                du = vmw_crtc_to_du(crtc);

                du->hotspot_x = 0;
                du->hotspot_y = 0;
        }
        drm_modeset_unlock_all(dev);
}

void vmw_kms_cursor_post_execbuf(struct vmw_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;
        struct vmw_display_unit *du;
        struct drm_crtc *crtc;

        mutex_lock(&dev->mode_config.mutex);

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                du = vmw_crtc_to_du(crtc);
                if (!du->cursor_surface ||
                    du->cursor_age == du->cursor_surface->snooper.age)
                        continue;

                du->cursor_age = du->cursor_surface->snooper.age;
                vmw_cursor_update_image(dev_priv,
                                        du->cursor_surface->snooper.image,
                                        64, 64,
                                        du->hotspot_x + du->core_hotspot_x,
                                        du->hotspot_y + du->core_hotspot_y);
        }

        mutex_unlock(&dev->mode_config.mutex);
}

/*
 * Generic framebuffer code
 */

/*
 * Surface framebuffer code
 */

static void vmw_framebuffer_surface_destroy(struct drm_framebuffer *framebuffer)
{
        struct vmw_framebuffer_surface *vfbs =
                vmw_framebuffer_to_vfbs(framebuffer);

        drm_framebuffer_cleanup(framebuffer);
        vmw_surface_unreference(&vfbs->surface);
        if (vfbs->base.user_obj)
                ttm_base_object_unref(&vfbs->base.user_obj);

        kfree(vfbs);
}

static int vmw_framebuffer_surface_dirty(struct drm_framebuffer *framebuffer,
                                  struct drm_file *file_priv,
                                  unsigned flags, unsigned color,
                                  struct drm_clip_rect *clips,
                                  unsigned num_clips)
{
        struct vmw_private *dev_priv = vmw_priv(framebuffer->dev);
        struct vmw_framebuffer_surface *vfbs =
                vmw_framebuffer_to_vfbs(framebuffer);
        struct drm_clip_rect norect;
        int ret, inc = 1;

        /* Legacy Display Unit does not support 3D */
        if (dev_priv->active_display_unit == vmw_du_legacy)
                return -EINVAL;

        drm_modeset_lock_all(dev_priv->dev);

        ret = ttm_read_lock(&dev_priv->reservation_sem, true);
        if (unlikely(ret != 0)) {
                drm_modeset_unlock_all(dev_priv->dev);
                return ret;
        }

        if (!num_clips) {
                num_clips = 1;
                clips = &norect;
                norect.x1 = norect.y1 = 0;
                norect.x2 = framebuffer->width;
                norect.y2 = framebuffer->height;
        } else if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY) {
                num_clips /= 2;
                inc = 2; /* skip source rects */
        }

        if (dev_priv->active_display_unit == vmw_du_screen_object)
                ret = vmw_kms_sou_do_surface_dirty(dev_priv, &vfbs->base,
                                                   clips, NULL, NULL, 0, 0,
                                                   num_clips, inc, NULL);
        else
                ret = vmw_kms_stdu_surface_dirty(dev_priv, &vfbs->base,
                                                 clips, NULL, NULL, 0, 0,
                                                 num_clips, inc, NULL);

        vmw_fifo_flush(dev_priv, false);
        ttm_read_unlock(&dev_priv->reservation_sem);

        drm_modeset_unlock_all(dev_priv->dev);

        return 0;
}

/**
 * vmw_kms_readback - Perform a readback from the screen system to
 * a dma-buffer backed framebuffer.
 *
 * @dev_priv: Pointer to the device private structure.
 * @file_priv: Pointer to a struct drm_file identifying the caller.
 * Must be set to NULL if @user_fence_rep is NULL.
 * @vfb: Pointer to the dma-buffer backed framebuffer.
 * @user_fence_rep: User-space provided structure for fence information.
 * Must be set to non-NULL if @file_priv is non-NULL.
 * @vclips: Array of clip rects.
 * @num_clips: Number of clip rects in @vclips.
 *
 * Returns 0 on success, negative error code on failure. -ERESTARTSYS if
 * interrupted.
 */
int vmw_kms_readback(struct vmw_private *dev_priv,
                     struct drm_file *file_priv,
                     struct vmw_framebuffer *vfb,
                     struct drm_vmw_fence_rep __user *user_fence_rep,
                     struct drm_vmw_rect *vclips,
                     uint32_t num_clips)
{
        switch (dev_priv->active_display_unit) {
        case vmw_du_screen_object:
                return vmw_kms_sou_readback(dev_priv, file_priv, vfb,
                                            user_fence_rep, vclips, num_clips);
        case vmw_du_screen_target:
                return vmw_kms_stdu_dma(dev_priv, file_priv, vfb,
                                        user_fence_rep, NULL, vclips, num_clips,
                                        1, false, true);
        default:
                WARN_ONCE(true,
                          "Readback called with invalid display system.\n");
}

        return -ENOSYS;
}


static const struct drm_framebuffer_funcs vmw_framebuffer_surface_funcs = {
        .destroy = vmw_framebuffer_surface_destroy,
        .dirty = vmw_framebuffer_surface_dirty,
};

static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
                                           struct vmw_surface *surface,
                                           struct vmw_framebuffer **out,
                                           const struct drm_mode_fb_cmd
                                           *mode_cmd,
                                           bool is_dmabuf_proxy)

{
        struct drm_device *dev = dev_priv->dev;
        struct vmw_framebuffer_surface *vfbs;
        enum SVGA3dSurfaceFormat format;
        int ret;

        /* 3D is only supported on HWv8 and newer hosts */
        if (dev_priv->active_display_unit == vmw_du_legacy)
                return -ENOSYS;

        /*
         * Sanity checks.
         */

        /* Surface must be marked as a scanout. */
        if (unlikely(!surface->scanout))
                return -EINVAL;

        if (unlikely(surface->mip_levels[0] != 1 ||
                     surface->num_sizes != 1 ||
                     surface->base_size.width < mode_cmd->width ||
                     surface->base_size.height < mode_cmd->height ||
                     surface->base_size.depth != 1)) {
                DRM_ERROR("Incompatible surface dimensions "
                          "for requested mode.\n");
                return -EINVAL;
        }

        switch (mode_cmd->depth) {
        case 32:
                format = SVGA3D_A8R8G8B8;
                break;
        case 24:
                format = SVGA3D_X8R8G8B8;
                break;
        case 16:
                format = SVGA3D_R5G6B5;
                break;
        case 15:
                format = SVGA3D_A1R5G5B5;
                break;
        default:
                DRM_ERROR("Invalid color depth: %d\n", mode_cmd->depth);
                return -EINVAL;
        }

        /*
         * For DX, surface format validation is done when surface->scanout
         * is set.
         */
        if (!dev_priv->has_dx && format != surface->format) {
                DRM_ERROR("Invalid surface format for requested mode.\n");
                return -EINVAL;
        }

        vfbs = kzalloc(sizeof(*vfbs), GFP_KERNEL);
        if (!vfbs) {
                ret = -ENOMEM;
                goto out_err1;
        }

        /* XXX get the first 3 from the surface info */
        vfbs->base.base.bits_per_pixel = mode_cmd->bpp;
        vfbs->base.base.pitches[0] = mode_cmd->pitch;
        vfbs->base.base.depth = mode_cmd->depth;
        vfbs->base.base.width = mode_cmd->width;
        vfbs->base.base.height = mode_cmd->height;
        vfbs->surface = vmw_surface_reference(surface);
        vfbs->base.user_handle = mode_cmd->handle;
        vfbs->is_dmabuf_proxy = is_dmabuf_proxy;

        *out = &vfbs->base;

        ret = drm_framebuffer_init(dev, &vfbs->base.base,
                                   &vmw_framebuffer_surface_funcs);
        if (ret)
                goto out_err2;

        return 0;

out_err2:
        vmw_surface_unreference(&surface);
        kfree(vfbs);
out_err1:
        return ret;
}

/*
 * Dmabuf framebuffer code
 */

static void vmw_framebuffer_dmabuf_destroy(struct drm_framebuffer *framebuffer)
{
        struct vmw_framebuffer_dmabuf *vfbd =
                vmw_framebuffer_to_vfbd(framebuffer);

        drm_framebuffer_cleanup(framebuffer);
        vmw_dmabuf_unreference(&vfbd->buffer);
        if (vfbd->base.user_obj)
                ttm_base_object_unref(&vfbd->base.user_obj);

        kfree(vfbd);
}

static int vmw_framebuffer_dmabuf_dirty(struct drm_framebuffer *framebuffer,
                                 struct drm_file *file_priv,
                                 unsigned flags, unsigned color,
                                 struct drm_clip_rect *clips,
                                 unsigned num_clips)
{
        struct vmw_private *dev_priv = vmw_priv(framebuffer->dev);
        struct vmw_framebuffer_dmabuf *vfbd =
                vmw_framebuffer_to_vfbd(framebuffer);
        struct drm_clip_rect norect;
        int ret, increment = 1;

        drm_modeset_lock_all(dev_priv->dev);

        ret = ttm_read_lock(&dev_priv->reservation_sem, true);
        if (unlikely(ret != 0)) {
                drm_modeset_unlock_all(dev_priv->dev);
                return ret;
        }

        if (!num_clips) {
                num_clips = 1;
                clips = &norect;
                norect.x1 = norect.y1 = 0;
                norect.x2 = framebuffer->width;
                norect.y2 = framebuffer->height;
        } else if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY) {
                num_clips /= 2;
                increment = 2;
        }

        switch (dev_priv->active_display_unit) {
        case vmw_du_screen_target:
                ret = vmw_kms_stdu_dma(dev_priv, NULL, &vfbd->base, NULL,
                                       clips, NULL, num_clips, increment,
                                       true, true);
                break;
        case vmw_du_screen_object:
                ret = vmw_kms_sou_do_dmabuf_dirty(dev_priv, &vfbd->base,
                                                  clips, NULL, num_clips,
                                                  increment, true, NULL);
                break;
        case vmw_du_legacy:
                ret = vmw_kms_ldu_do_dmabuf_dirty(dev_priv, &vfbd->base, 0, 0,
                                                  clips, num_clips, increment);
                break;
        default:
                ret = -EINVAL;
                WARN_ONCE(true, "Dirty called with invalid display system.\n");
                break;
        }

        vmw_fifo_flush(dev_priv, false);
        ttm_read_unlock(&dev_priv->reservation_sem);

        drm_modeset_unlock_all(dev_priv->dev);

        return ret;
}

static const struct drm_framebuffer_funcs vmw_framebuffer_dmabuf_funcs = {
        .destroy = vmw_framebuffer_dmabuf_destroy,
        .dirty = vmw_framebuffer_dmabuf_dirty,
};

/**
 * Pin the dmabuffer to the start of vram.
 */
static int vmw_framebuffer_pin(struct vmw_framebuffer *vfb)
{
        struct vmw_private *dev_priv = vmw_priv(vfb->base.dev);
        struct vmw_dma_buffer *buf;
        int ret;

        buf = vfb->dmabuf ?  vmw_framebuffer_to_vfbd(&vfb->base)->buffer :
                vmw_framebuffer_to_vfbs(&vfb->base)->surface->res.backup;

        if (!buf)
                return 0;

        switch (dev_priv->active_display_unit) {
        case vmw_du_legacy:
                vmw_overlay_pause_all(dev_priv);
                ret = vmw_dmabuf_pin_in_start_of_vram(dev_priv, buf, false);
                vmw_overlay_resume_all(dev_priv);
                break;
        case vmw_du_screen_object:
        case vmw_du_screen_target:
                if (vfb->dmabuf)
                        return vmw_dmabuf_pin_in_vram_or_gmr(dev_priv, buf,
                                                             false);

                return vmw_dmabuf_pin_in_placement(dev_priv, buf,
                                                   &vmw_mob_placement, false);
        default:
                return -EINVAL;
        }

        return ret;
}

static int vmw_framebuffer_unpin(struct vmw_framebuffer *vfb)
{
        struct vmw_private *dev_priv = vmw_priv(vfb->base.dev);
        struct vmw_dma_buffer *buf;

        buf = vfb->dmabuf ?  vmw_framebuffer_to_vfbd(&vfb->base)->buffer :
                vmw_framebuffer_to_vfbs(&vfb->base)->surface->res.backup;

        if (WARN_ON(!buf))
                return 0;

        return vmw_dmabuf_unpin(dev_priv, buf, false);
}

/**
 * vmw_create_dmabuf_proxy - create a proxy surface for the DMA buf
 *
 * @dev: DRM device
 * @mode_cmd: parameters for the new surface
 * @dmabuf_mob: MOB backing the DMA buf
 * @srf_out: newly created surface
 *
 * When the content FB is a DMA buf, we create a surface as a proxy to the
 * same buffer.  This way we can do a surface copy rather than a surface DMA.
 * This is a more efficient approach
 *
 * RETURNS:
 * 0 on success, error code otherwise
 */
static int vmw_create_dmabuf_proxy(struct drm_device *dev,
                                   const struct drm_mode_fb_cmd *mode_cmd,
                                   struct vmw_dma_buffer *dmabuf_mob,
                                   struct vmw_surface **srf_out)
{
        uint32_t format;
        struct drm_vmw_size content_base_size;
        struct vmw_resource *res;
        unsigned int bytes_pp;
        int ret;

        switch (mode_cmd->depth) {
        case 32:
        case 24:
                format = SVGA3D_X8R8G8B8;
                bytes_pp = 4;
                break;

        case 16:
        case 15:
                format = SVGA3D_R5G6B5;
                bytes_pp = 2;
                break;

        case 8:
                format = SVGA3D_P8;
                bytes_pp = 1;
                break;

        default:
                DRM_ERROR("Invalid framebuffer format %d\n", mode_cmd->depth);
                return -EINVAL;
        }

        content_base_size.width  = mode_cmd->pitch / bytes_pp;
        content_base_size.height = mode_cmd->height;
        content_base_size.depth  = 1;

        ret = vmw_surface_gb_priv_define(dev,
                        0, /* kernel visible only */
                        0, /* flags */
                        format,
                        true, /* can be a scanout buffer */
                        1, /* num of mip levels */
                        0,
                        0,
                        content_base_size,
                        srf_out);
        if (ret) {
                DRM_ERROR("Failed to allocate proxy content buffer\n");
                return ret;
        }

        res = &(*srf_out)->res;

        /* Reserve and switch the backing mob. */
        mutex_lock(&res->dev_priv->cmdbuf_mutex);
        (void) vmw_resource_reserve(res, false, true);
        vmw_dmabuf_unreference(&res->backup);
        res->backup = vmw_dmabuf_reference(dmabuf_mob);
        res->backup_offset = 0;
        vmw_resource_unreserve(res, false, NULL, 0);
        mutex_unlock(&res->dev_priv->cmdbuf_mutex);

        return 0;
}



static int vmw_kms_new_framebuffer_dmabuf(struct vmw_private *dev_priv,
                                          struct vmw_dma_buffer *dmabuf,
                                          struct vmw_framebuffer **out,
                                          const struct drm_mode_fb_cmd
                                          *mode_cmd)

{
        struct drm_device *dev = dev_priv->dev;
        struct vmw_framebuffer_dmabuf *vfbd;
        unsigned int requested_size;
        int ret;

        requested_size = mode_cmd->height * mode_cmd->pitch;
        if (unlikely(requested_size > dmabuf->base.num_pages * PAGE_SIZE)) {
                DRM_ERROR("Screen buffer object size is too small "
                          "for requested mode.\n");
                return -EINVAL;
        }

        /* Limited framebuffer color depth support for screen objects */
        if (dev_priv->active_display_unit == vmw_du_screen_object) {
                switch (mode_cmd->depth) {
                case 32:
                case 24:
                        /* Only support 32 bpp for 32 and 24 depth fbs */
                        if (mode_cmd->bpp == 32)
                                break;

                        DRM_ERROR("Invalid color depth/bbp: %d %d\n",
                                  mode_cmd->depth, mode_cmd->bpp);
                        return -EINVAL;
                case 16:
                case 15:
                        /* Only support 16 bpp for 16 and 15 depth fbs */
                        if (mode_cmd->bpp == 16)
                                break;

                        DRM_ERROR("Invalid color depth/bbp: %d %d\n",
                                  mode_cmd->depth, mode_cmd->bpp);
                        return -EINVAL;
                default:
                        DRM_ERROR("Invalid color depth: %d\n", mode_cmd->depth);
                        return -EINVAL;
                }
        }

        vfbd = kzalloc(sizeof(*vfbd), GFP_KERNEL);
        if (!vfbd) {
                ret = -ENOMEM;
                goto out_err1;
        }

        vfbd->base.base.bits_per_pixel = mode_cmd->bpp;
        vfbd->base.base.pitches[0] = mode_cmd->pitch;
        vfbd->base.base.depth = mode_cmd->depth;
        vfbd->base.base.width = mode_cmd->width;
        vfbd->base.base.height = mode_cmd->height;
        vfbd->base.dmabuf = true;
        vfbd->buffer = vmw_dmabuf_reference(dmabuf);
        vfbd->base.user_handle = mode_cmd->handle;
        *out = &vfbd->base;

        ret = drm_framebuffer_init(dev, &vfbd->base.base,
                                   &vmw_framebuffer_dmabuf_funcs);
        if (ret)
                goto out_err2;

        return 0;

out_err2:
        vmw_dmabuf_unreference(&dmabuf);
        kfree(vfbd);
out_err1:
        return ret;
}

/**
 * vmw_kms_new_framebuffer - Create a new framebuffer.
 *
 * @dev_priv: Pointer to device private struct.
 * @dmabuf: Pointer to dma buffer to wrap the kms framebuffer around.
 * Either @dmabuf or @surface must be NULL.
 * @surface: Pointer to a surface to wrap the kms framebuffer around.
 * Either @dmabuf or @surface must be NULL.
 * @only_2d: No presents will occur to this dma buffer based framebuffer. This
 * Helps the code to do some important optimizations.
 * @mode_cmd: Frame-buffer metadata.
 */
struct vmw_framebuffer *
vmw_kms_new_framebuffer(struct vmw_private *dev_priv,
                        struct vmw_dma_buffer *dmabuf,
                        struct vmw_surface *surface,
                        bool only_2d,
                        const struct drm_mode_fb_cmd *mode_cmd)
{
        struct vmw_framebuffer *vfb = NULL;
        bool is_dmabuf_proxy = false;
        int ret;

        /*
         * We cannot use the SurfaceDMA command in an non-accelerated VM,
         * therefore, wrap the DMA buf in a surface so we can use the
         * SurfaceCopy command.
         */
        if (dmabuf && only_2d &&
            dev_priv->active_display_unit == vmw_du_screen_target) {
                ret = vmw_create_dmabuf_proxy(dev_priv->dev, mode_cmd,
                                              dmabuf, &surface);
                if (ret)
                        return ERR_PTR(ret);

                is_dmabuf_proxy = true;
        }

        /* Create the new framebuffer depending one what we have */
        if (surface) {
                ret = vmw_kms_new_framebuffer_surface(dev_priv, surface, &vfb,
                                                      mode_cmd,
                                                      is_dmabuf_proxy);

                /*
                 * vmw_create_dmabuf_proxy() adds a reference that is no longer
                 * needed
                 */
                if (is_dmabuf_proxy)
                        vmw_surface_unreference(&surface);
        } else if (dmabuf) {
                ret = vmw_kms_new_framebuffer_dmabuf(dev_priv, dmabuf, &vfb,
                                                     mode_cmd);
        } else {
                BUG();
        }

        if (ret)
                return ERR_PTR(ret);

        vfb->pin = vmw_framebuffer_pin;
        vfb->unpin = vmw_framebuffer_unpin;

        return vfb;
}

/*
 * Generic Kernel modesetting functions
 */

static struct drm_framebuffer *vmw_kms_fb_create(struct drm_device *dev,
                                                 struct drm_file *file_priv,
                                                 const struct drm_mode_fb_cmd2 *mode_cmd2)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
        struct vmw_framebuffer *vfb = NULL;
        struct vmw_surface *surface = NULL;
        struct vmw_dma_buffer *bo = NULL;
        struct ttm_base_object *user_obj;
        struct drm_mode_fb_cmd mode_cmd;
        int ret;

        mode_cmd.width = mode_cmd2->width;
        mode_cmd.height = mode_cmd2->height;
        mode_cmd.pitch = mode_cmd2->pitches[0];
        mode_cmd.handle = mode_cmd2->handles[0];
        drm_fb_get_bpp_depth(mode_cmd2->pixel_format, &mode_cmd.depth,
                                    &mode_cmd.bpp);

        /**
         * This code should be conditioned on Screen Objects not being used.
         * If screen objects are used, we can allocate a GMR to hold the
         * requested framebuffer.
         */

        if (!vmw_kms_validate_mode_vram(dev_priv,
                                        mode_cmd.pitch,
                                        mode_cmd.height)) {

                DRM_ERROR("Requested mode exceed bounding box limit.\n");
                return ERR_PTR(-ENOMEM);
        }

        /*
         * Take a reference on the user object of the resource
         * backing the kms fb. This ensures that user-space handle
         * lookups on that resource will always work as long as
         * it's registered with a kms framebuffer. This is important,
         * since vmw_execbuf_process identifies resources in the
         * command stream using user-space handles.
         */

        user_obj = ttm_base_object_lookup(tfile, mode_cmd.handle);
        if (unlikely(user_obj == NULL)) {
                DRM_ERROR("Could not locate requested kms frame buffer.\n");
                return ERR_PTR(-ENOENT);
        }

        /**
         * End conditioned code.
         */

        /* returns either a dmabuf or surface */
        ret = vmw_user_lookup_handle(dev_priv, tfile,
                                     mode_cmd.handle,
                                     &surface, &bo);
        if (ret)
                goto err_out;

        vfb = vmw_kms_new_framebuffer(dev_priv, bo, surface,
                                      !(dev_priv->capabilities & SVGA_CAP_3D),
                                      &mode_cmd);
        if (IS_ERR(vfb)) {
                ret = PTR_ERR(vfb);
                goto err_out;
        }

err_out:
        /* vmw_user_lookup_handle takes one ref so does new_fb */
        if (bo)
                vmw_dmabuf_unreference(&bo);
        if (surface)
                vmw_surface_unreference(&surface);

        if (ret) {
                DRM_ERROR("failed to create vmw_framebuffer: %i\n", ret);
                ttm_base_object_unref(&user_obj);
                return ERR_PTR(ret);
        } else
                vfb->user_obj = user_obj;

        return &vfb->base;
}

static const struct drm_mode_config_funcs vmw_kms_funcs = {
        .fb_create = vmw_kms_fb_create,
};

static int vmw_kms_generic_present(struct vmw_private *dev_priv,
                                   struct drm_file *file_priv,
                                   struct vmw_framebuffer *vfb,
                                   struct vmw_surface *surface,
                                   uint32_t sid,
                                   int32_t destX, int32_t destY,
                                   struct drm_vmw_rect *clips,
                                   uint32_t num_clips)
{
        return vmw_kms_sou_do_surface_dirty(dev_priv, vfb, NULL, clips,
                                            &surface->res, destX, destY,
                                            num_clips, 1, NULL);
}


int vmw_kms_present(struct vmw_private *dev_priv,
                    struct drm_file *file_priv,
                    struct vmw_framebuffer *vfb,
                    struct vmw_surface *surface,
                    uint32_t sid,
                    int32_t destX, int32_t destY,
                    struct drm_vmw_rect *clips,
                    uint32_t num_clips)
{
        int ret;

        switch (dev_priv->active_display_unit) {
        case vmw_du_screen_target:
                ret = vmw_kms_stdu_surface_dirty(dev_priv, vfb, NULL, clips,
                                                 &surface->res, destX, destY,
                                                 num_clips, 1, NULL);
                break;
        case vmw_du_screen_object:
                ret = vmw_kms_generic_present(dev_priv, file_priv, vfb, surface,
                                              sid, destX, destY, clips,
                                              num_clips);
                break;
        default:
                WARN_ONCE(true,
                          "Present called with invalid display system.\n");
                ret = -ENOSYS;
                break;
        }
        if (ret)
                return ret;

        vmw_fifo_flush(dev_priv, false);

        return 0;
}

static void
vmw_kms_create_hotplug_mode_update_property(struct vmw_private *dev_priv)
{
        if (dev_priv->hotplug_mode_update_property)
                return;

        dev_priv->hotplug_mode_update_property =
                drm_property_create_range(dev_priv->dev,
                                          DRM_MODE_PROP_IMMUTABLE,
                                          "hotplug_mode_update", 0, 1);

        if (!dev_priv->hotplug_mode_update_property)
                return;

}

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

        drm_mode_config_init(dev);
        dev->mode_config.funcs = &vmw_kms_funcs;
        dev->mode_config.min_width = 1;
        dev->mode_config.min_height = 1;
        dev->mode_config.max_width = dev_priv->texture_max_width;
        dev->mode_config.max_height = dev_priv->texture_max_height;

        drm_mode_create_suggested_offset_properties(dev);
        vmw_kms_create_hotplug_mode_update_property(dev_priv);

        ret = vmw_kms_stdu_init_display(dev_priv);
        if (ret) {
                ret = vmw_kms_sou_init_display(dev_priv);
                if (ret) /* Fallback */
                        ret = vmw_kms_ldu_init_display(dev_priv);
        }

        return ret;
}

int vmw_kms_close(struct vmw_private *dev_priv)
{
        int ret;

        /*
         * Docs says we should take the lock before calling this function
         * but since it destroys encoders and our destructor calls
         * drm_encoder_cleanup which takes the lock we deadlock.
         */
        drm_mode_config_cleanup(dev_priv->dev);
        if (dev_priv->active_display_unit == vmw_du_screen_object)
                ret = vmw_kms_sou_close_display(dev_priv);
        else if (dev_priv->active_display_unit == vmw_du_screen_target)
                ret = vmw_kms_stdu_close_display(dev_priv);
        else
                ret = vmw_kms_ldu_close_display(dev_priv);

        return ret;
}

int vmw_kms_cursor_bypass_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv)
{
        struct drm_vmw_cursor_bypass_arg *arg = data;
        struct vmw_display_unit *du;
        struct drm_crtc *crtc;
        int ret = 0;


        mutex_lock(&dev->mode_config.mutex);
        if (arg->flags & DRM_VMW_CURSOR_BYPASS_ALL) {

                list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                        du = vmw_crtc_to_du(crtc);
                        du->hotspot_x = arg->xhot;
                        du->hotspot_y = arg->yhot;
                }

                mutex_unlock(&dev->mode_config.mutex);
                return 0;
        }

        crtc = drm_crtc_find(dev, arg->crtc_id);
        if (!crtc) {
                ret = -ENOENT;
                goto out;
        }

        du = vmw_crtc_to_du(crtc);

        du->hotspot_x = arg->xhot;
        du->hotspot_y = arg->yhot;

out:
        mutex_unlock(&dev->mode_config.mutex);

        return ret;
}

int vmw_kms_write_svga(struct vmw_private *vmw_priv,
                        unsigned width, unsigned height, unsigned pitch,
                        unsigned bpp, unsigned depth)
{
        if (vmw_priv->capabilities & SVGA_CAP_PITCHLOCK)
                vmw_write(vmw_priv, SVGA_REG_PITCHLOCK, pitch);
        else if (vmw_fifo_have_pitchlock(vmw_priv))
                vmw_mmio_write(pitch, vmw_priv->mmio_virt +
                               SVGA_FIFO_PITCHLOCK);
        vmw_write(vmw_priv, SVGA_REG_WIDTH, width);
        vmw_write(vmw_priv, SVGA_REG_HEIGHT, height);
        vmw_write(vmw_priv, SVGA_REG_BITS_PER_PIXEL, bpp);

        if (vmw_read(vmw_priv, SVGA_REG_DEPTH) != depth) {
                DRM_ERROR("Invalid depth %u for %u bpp, host expects %u\n",
                          depth, bpp, vmw_read(vmw_priv, SVGA_REG_DEPTH));
                return -EINVAL;
        }

        return 0;
}

int vmw_kms_save_vga(struct vmw_private *vmw_priv)
{
        struct vmw_vga_topology_state *save;
        uint32_t i;

        vmw_priv->vga_width = vmw_read(vmw_priv, SVGA_REG_WIDTH);
        vmw_priv->vga_height = vmw_read(vmw_priv, SVGA_REG_HEIGHT);
        vmw_priv->vga_bpp = vmw_read(vmw_priv, SVGA_REG_BITS_PER_PIXEL);
        if (vmw_priv->capabilities & SVGA_CAP_PITCHLOCK)
                vmw_priv->vga_pitchlock =
                  vmw_read(vmw_priv, SVGA_REG_PITCHLOCK);
        else if (vmw_fifo_have_pitchlock(vmw_priv))
                vmw_priv->vga_pitchlock = vmw_mmio_read(vmw_priv->mmio_virt +
                                                        SVGA_FIFO_PITCHLOCK);

        if (!(vmw_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY))
                return 0;

        vmw_priv->num_displays = vmw_read(vmw_priv,
                                          SVGA_REG_NUM_GUEST_DISPLAYS);

        if (vmw_priv->num_displays == 0)
                vmw_priv->num_displays = 1;

        for (i = 0; i < vmw_priv->num_displays; ++i) {
                save = &vmw_priv->vga_save[i];
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, i);
                save->primary = vmw_read(vmw_priv, SVGA_REG_DISPLAY_IS_PRIMARY);
                save->pos_x = vmw_read(vmw_priv, SVGA_REG_DISPLAY_POSITION_X);
                save->pos_y = vmw_read(vmw_priv, SVGA_REG_DISPLAY_POSITION_Y);
                save->width = vmw_read(vmw_priv, SVGA_REG_DISPLAY_WIDTH);
                save->height = vmw_read(vmw_priv, SVGA_REG_DISPLAY_HEIGHT);
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);
                if (i == 0 && vmw_priv->num_displays == 1 &&
                    save->width == 0 && save->height == 0) {

                        /*
                         * It should be fairly safe to assume that these
                         * values are uninitialized.
                         */

                        save->width = vmw_priv->vga_width - save->pos_x;
                        save->height = vmw_priv->vga_height - save->pos_y;
                }
        }

        return 0;
}

int vmw_kms_restore_vga(struct vmw_private *vmw_priv)
{
        struct vmw_vga_topology_state *save;
        uint32_t i;

        vmw_write(vmw_priv, SVGA_REG_WIDTH, vmw_priv->vga_width);
        vmw_write(vmw_priv, SVGA_REG_HEIGHT, vmw_priv->vga_height);
        vmw_write(vmw_priv, SVGA_REG_BITS_PER_PIXEL, vmw_priv->vga_bpp);
        if (vmw_priv->capabilities & SVGA_CAP_PITCHLOCK)
                vmw_write(vmw_priv, SVGA_REG_PITCHLOCK,
                          vmw_priv->vga_pitchlock);
        else if (vmw_fifo_have_pitchlock(vmw_priv))
                vmw_mmio_write(vmw_priv->vga_pitchlock,
                               vmw_priv->mmio_virt + SVGA_FIFO_PITCHLOCK);

        if (!(vmw_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY))
                return 0;

        for (i = 0; i < vmw_priv->num_displays; ++i) {
                save = &vmw_priv->vga_save[i];
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, i);
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_IS_PRIMARY, save->primary);
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_X, save->pos_x);
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_POSITION_Y, save->pos_y);
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_WIDTH, save->width);
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_HEIGHT, save->height);
                vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);
        }

        return 0;
}

bool vmw_kms_validate_mode_vram(struct vmw_private *dev_priv,
                                uint32_t pitch,
                                uint32_t height)
{
        return ((u64) pitch * (u64) height) < (u64)
                ((dev_priv->active_display_unit == vmw_du_screen_target) ?
                 dev_priv->prim_bb_mem : dev_priv->vram_size);
}


/**
 * Function called by DRM code called with vbl_lock held.
 */
u32 vmw_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
{
        return 0;
}

/**
 * Function called by DRM code called with vbl_lock held.
 */
int vmw_enable_vblank(struct drm_device *dev, unsigned int pipe)
{
        return -ENOSYS;
}

/**
 * Function called by DRM code called with vbl_lock held.
 */
void vmw_disable_vblank(struct drm_device *dev, unsigned int pipe)
{
}


/*
 * Small shared kms functions.
 */

static int vmw_du_update_layout(struct vmw_private *dev_priv, unsigned num,
                         struct drm_vmw_rect *rects)
{
        struct drm_device *dev = dev_priv->dev;
        struct vmw_display_unit *du;
        struct drm_connector *con;

        mutex_lock(&dev->mode_config.mutex);

#if 0
        {
                unsigned int i;

                DRM_INFO("%s: new layout ", __func__);
                for (i = 0; i < num; i++)
                        DRM_INFO("(%i, %i %ux%u) ", rects[i].x, rects[i].y,
                                 rects[i].w, rects[i].h);
                DRM_INFO("\n");
        }
#endif

        list_for_each_entry(con, &dev->mode_config.connector_list, head) {
                du = vmw_connector_to_du(con);
                if (num > du->unit) {
                        du->pref_width = rects[du->unit].w;
                        du->pref_height = rects[du->unit].h;
                        du->pref_active = true;
                        du->gui_x = rects[du->unit].x;
                        du->gui_y = rects[du->unit].y;
                        drm_object_property_set_value
                          (&con->base, dev->mode_config.suggested_x_property,
                           du->gui_x);
                        drm_object_property_set_value
                          (&con->base, dev->mode_config.suggested_y_property,
                           du->gui_y);
                } else {
                        du->pref_width = 800;
                        du->pref_height = 600;
                        du->pref_active = false;
                        drm_object_property_set_value
                          (&con->base, dev->mode_config.suggested_x_property,
                           0);
                        drm_object_property_set_value
                          (&con->base, dev->mode_config.suggested_y_property,
                           0);
                }
                con->status = vmw_du_connector_detect(con, true);
        }

        mutex_unlock(&dev->mode_config.mutex);
        drm_sysfs_hotplug_event(dev);

        return 0;
}

void vmw_du_crtc_gamma_set(struct drm_crtc *crtc,
                           u16 *r, u16 *g, u16 *b,
                           uint32_t start, uint32_t size)
{
        struct vmw_private *dev_priv = vmw_priv(crtc->dev);
        int i;

        for (i = 0; i < size; i++) {
                DRM_DEBUG("%d r/g/b = 0x%04x / 0x%04x / 0x%04x\n", i,
                          r[i], g[i], b[i]);
                vmw_write(dev_priv, SVGA_PALETTE_BASE + i * 3 + 0, r[i] >> 8);
                vmw_write(dev_priv, SVGA_PALETTE_BASE + i * 3 + 1, g[i] >> 8);
                vmw_write(dev_priv, SVGA_PALETTE_BASE + i * 3 + 2, b[i] >> 8);
        }
}

int vmw_du_connector_dpms(struct drm_connector *connector, int mode)
{
        return 0;
}

enum drm_connector_status
vmw_du_connector_detect(struct drm_connector *connector, bool force)
{
        uint32_t num_displays;
        struct drm_device *dev = connector->dev;
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct vmw_display_unit *du = vmw_connector_to_du(connector);

        num_displays = vmw_read(dev_priv, SVGA_REG_NUM_DISPLAYS);

        return ((vmw_connector_to_du(connector)->unit < num_displays &&
                 du->pref_active) ?
                connector_status_connected : connector_status_disconnected);
}

static struct drm_display_mode vmw_kms_connector_builtin[] = {
        /* 640x480@60Hz */
        { DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25175, 640, 656,
                   752, 800, 0, 480, 489, 492, 525, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
        /* 800x600@60Hz */
        { DRM_MODE("800x600", DRM_MODE_TYPE_DRIVER, 40000, 800, 840,
                   968, 1056, 0, 600, 601, 605, 628, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1024x768@60Hz */
        { DRM_MODE("1024x768", DRM_MODE_TYPE_DRIVER, 65000, 1024, 1048,
                   1184, 1344, 0, 768, 771, 777, 806, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC) },
        /* 1152x864@75Hz */
        { DRM_MODE("1152x864", DRM_MODE_TYPE_DRIVER, 108000, 1152, 1216,
                   1344, 1600, 0, 864, 865, 868, 900, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1280x768@60Hz */
        { DRM_MODE("1280x768", DRM_MODE_TYPE_DRIVER, 79500, 1280, 1344,
                   1472, 1664, 0, 768, 771, 778, 798, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1280x800@60Hz */
        { DRM_MODE("1280x800", DRM_MODE_TYPE_DRIVER, 83500, 1280, 1352,
                   1480, 1680, 0, 800, 803, 809, 831, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
        /* 1280x960@60Hz */
        { DRM_MODE("1280x960", DRM_MODE_TYPE_DRIVER, 108000, 1280, 1376,
                   1488, 1800, 0, 960, 961, 964, 1000, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1280x1024@60Hz */
        { DRM_MODE("1280x1024", DRM_MODE_TYPE_DRIVER, 108000, 1280, 1328,
                   1440, 1688, 0, 1024, 1025, 1028, 1066, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1360x768@60Hz */
        { DRM_MODE("1360x768", DRM_MODE_TYPE_DRIVER, 85500, 1360, 1424,
                   1536, 1792, 0, 768, 771, 777, 795, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1440x1050@60Hz */
        { DRM_MODE("1400x1050", DRM_MODE_TYPE_DRIVER, 121750, 1400, 1488,
                   1632, 1864, 0, 1050, 1053, 1057, 1089, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1440x900@60Hz */
        { DRM_MODE("1440x900", DRM_MODE_TYPE_DRIVER, 106500, 1440, 1520,
                   1672, 1904, 0, 900, 903, 909, 934, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1600x1200@60Hz */
        { DRM_MODE("1600x1200", DRM_MODE_TYPE_DRIVER, 162000, 1600, 1664,
                   1856, 2160, 0, 1200, 1201, 1204, 1250, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1680x1050@60Hz */
        { DRM_MODE("1680x1050", DRM_MODE_TYPE_DRIVER, 146250, 1680, 1784,
                   1960, 2240, 0, 1050, 1053, 1059, 1089, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1792x1344@60Hz */
        { DRM_MODE("1792x1344", DRM_MODE_TYPE_DRIVER, 204750, 1792, 1920,
                   2120, 2448, 0, 1344, 1345, 1348, 1394, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1853x1392@60Hz */
        { DRM_MODE("1856x1392", DRM_MODE_TYPE_DRIVER, 218250, 1856, 1952,
                   2176, 2528, 0, 1392, 1393, 1396, 1439, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1920x1200@60Hz */
        { DRM_MODE("1920x1200", DRM_MODE_TYPE_DRIVER, 193250, 1920, 2056,
                   2256, 2592, 0, 1200, 1203, 1209, 1245, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 1920x1440@60Hz */
        { DRM_MODE("1920x1440", DRM_MODE_TYPE_DRIVER, 234000, 1920, 2048,
                   2256, 2600, 0, 1440, 1441, 1444, 1500, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* 2560x1600@60Hz */
        { DRM_MODE("2560x1600", DRM_MODE_TYPE_DRIVER, 348500, 2560, 2752,
                   3032, 3504, 0, 1600, 1603, 1609, 1658, 0,
                   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
        /* Terminate */
        { DRM_MODE("", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) },
};

/**
 * vmw_guess_mode_timing - Provide fake timings for a
 * 60Hz vrefresh mode.
 *
 * @mode - Pointer to a struct drm_display_mode with hdisplay and vdisplay
 * members filled in.
 */
void vmw_guess_mode_timing(struct drm_display_mode *mode)
{
        mode->hsync_start = mode->hdisplay + 50;
        mode->hsync_end = mode->hsync_start + 50;
        mode->htotal = mode->hsync_end + 50;

        mode->vsync_start = mode->vdisplay + 50;
        mode->vsync_end = mode->vsync_start + 50;
        mode->vtotal = mode->vsync_end + 50;

        mode->clock = (u32)mode->htotal * (u32)mode->vtotal / 100 * 6;
        mode->vrefresh = drm_mode_vrefresh(mode);
}


int vmw_du_connector_fill_modes(struct drm_connector *connector,
                                uint32_t max_width, uint32_t max_height)
{
        struct vmw_display_unit *du = vmw_connector_to_du(connector);
        struct drm_device *dev = connector->dev;
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct drm_display_mode *mode = NULL;
        struct drm_display_mode *bmode;
        struct drm_display_mode prefmode = { DRM_MODE("preferred",
                DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
                0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC)
        };
        int i;
        u32 assumed_bpp = 2;

        /*
         * If using screen objects, then assume 32-bpp because that's what the
         * SVGA device is assuming
         */
        if (dev_priv->active_display_unit == vmw_du_screen_object)
                assumed_bpp = 4;

        if (dev_priv->active_display_unit == vmw_du_screen_target) {
                max_width  = min(max_width,  dev_priv->stdu_max_width);
                max_height = min(max_height, dev_priv->stdu_max_height);
        }

        /* Add preferred mode */
        mode = drm_mode_duplicate(dev, &prefmode);
        if (!mode)
                return 0;
        mode->hdisplay = du->pref_width;
        mode->vdisplay = du->pref_height;
        vmw_guess_mode_timing(mode);

        if (vmw_kms_validate_mode_vram(dev_priv,
                                        mode->hdisplay * assumed_bpp,
                                        mode->vdisplay)) {
                drm_mode_probed_add(connector, mode);
        } else {
                drm_mode_destroy(dev, mode);
                mode = NULL;
        }

        if (du->pref_mode) {
                list_del_init(&du->pref_mode->head);
                drm_mode_destroy(dev, du->pref_mode);
        }

        /* mode might be null here, this is intended */
        du->pref_mode = mode;

        for (i = 0; vmw_kms_connector_builtin[i].type != 0; i++) {
                bmode = &vmw_kms_connector_builtin[i];
                if (bmode->hdisplay > max_width ||
                    bmode->vdisplay > max_height)
                        continue;

                if (!vmw_kms_validate_mode_vram(dev_priv,
                                                bmode->hdisplay * assumed_bpp,
                                                bmode->vdisplay))
                        continue;

                mode = drm_mode_duplicate(dev, bmode);
                if (!mode)
                        return 0;
                mode->vrefresh = drm_mode_vrefresh(mode);

                drm_mode_probed_add(connector, mode);
        }

        drm_mode_connector_list_update(connector);
        /* Move the prefered mode first, help apps pick the right mode. */
        drm_mode_sort(&connector->modes);

        return 1;
}

int vmw_du_connector_set_property(struct drm_connector *connector,
                                  struct drm_property *property,
                                  uint64_t val)
{
        struct vmw_display_unit *du = vmw_connector_to_du(connector);
        struct vmw_private *dev_priv = vmw_priv(connector->dev);

        if (property == dev_priv->implicit_placement_property)
                du->is_implicit = val;

        return 0;
}


int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct drm_vmw_update_layout_arg *arg =
                (struct drm_vmw_update_layout_arg *)data;
        void __user *user_rects;
        struct drm_vmw_rect *rects;
        unsigned rects_size;
        int ret;
        int i;
        u64 total_pixels = 0;
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct drm_vmw_rect bounding_box = {0};

        if (!arg->num_outputs) {
                struct drm_vmw_rect def_rect = {0, 0, 800, 600};
                vmw_du_update_layout(dev_priv, 1, &def_rect);
                return 0;
        }

        rects_size = arg->num_outputs * sizeof(struct drm_vmw_rect);
        rects = kcalloc(arg->num_outputs, sizeof(struct drm_vmw_rect),
                        GFP_KERNEL);
        if (unlikely(!rects))
                return -ENOMEM;

        user_rects = (void __user *)(unsigned long)arg->rects;
        ret = copy_from_user(rects, user_rects, rects_size);
        if (unlikely(ret != 0)) {
                DRM_ERROR("Failed to get rects.\n");
                ret = -EFAULT;
                goto out_free;
        }

        for (i = 0; i < arg->num_outputs; ++i) {
                if (rects[i].x < 0 ||
                    rects[i].y < 0 ||
                    rects[i].x + rects[i].w > mode_config->max_width ||
                    rects[i].y + rects[i].h > mode_config->max_height) {
                        DRM_ERROR("Invalid GUI layout.\n");
                        ret = -EINVAL;
                        goto out_free;
                }

                /*
                 * bounding_box.w and bunding_box.h are used as
                 * lower-right coordinates
                 */
                if (rects[i].x + rects[i].w > bounding_box.w)
                        bounding_box.w = rects[i].x + rects[i].w;

                if (rects[i].y + rects[i].h > bounding_box.h)
                        bounding_box.h = rects[i].y + rects[i].h;

                total_pixels += (u64) rects[i].w * (u64) rects[i].h;
        }

        if (dev_priv->active_display_unit == vmw_du_screen_target) {
                /*
                 * For Screen Targets, the limits for a toplogy are:
                 *      1. Bounding box (assuming 32bpp) must be < prim_bb_mem
                 *      2. Total pixels (assuming 32bpp) must be < prim_bb_mem
                 */
                u64 bb_mem    = bounding_box.w * bounding_box.h * 4;
                u64 pixel_mem = total_pixels * 4;

                if (bb_mem > dev_priv->prim_bb_mem) {
                        DRM_ERROR("Topology is beyond supported limits.\n");
                        ret = -EINVAL;
                        goto out_free;
                }

                if (pixel_mem > dev_priv->prim_bb_mem) {
                        DRM_ERROR("Combined output size too large\n");
                        ret = -EINVAL;
                        goto out_free;
                }
        }

        vmw_du_update_layout(dev_priv, arg->num_outputs, rects);

out_free:
        kfree(rects);
        return ret;
}

/**
 * vmw_kms_helper_dirty - Helper to build commands and perform actions based
 * on a set of cliprects and a set of display units.
 *
 * @dev_priv: Pointer to a device private structure.
 * @framebuffer: Pointer to the framebuffer on which to perform the actions.
 * @clips: A set of struct drm_clip_rect. Either this os @vclips must be NULL.
 * Cliprects are given in framebuffer coordinates.
 * @vclips: A set of struct drm_vmw_rect cliprects. Either this or @clips must
 * be NULL. Cliprects are given in source coordinates.
 * @dest_x: X coordinate offset for the crtc / destination clip rects.
 * @dest_y: Y coordinate offset for the crtc / destination clip rects.
 * @num_clips: Number of cliprects in the @clips or @vclips array.
 * @increment: Integer with which to increment the clip counter when looping.
 * Used to skip a predetermined number of clip rects.
 * @dirty: Closure structure. See the description of struct vmw_kms_dirty.
 */
int vmw_kms_helper_dirty(struct vmw_private *dev_priv,
                         struct vmw_framebuffer *framebuffer,
                         const struct drm_clip_rect *clips,
                         const struct drm_vmw_rect *vclips,
                         s32 dest_x, s32 dest_y,
                         int num_clips,
                         int increment,
                         struct vmw_kms_dirty *dirty)
{
        struct vmw_display_unit *units[VMWGFX_NUM_DISPLAY_UNITS];
        struct drm_crtc *crtc;
        u32 num_units = 0;
        u32 i, k;

        dirty->dev_priv = dev_priv;

        list_for_each_entry(crtc, &dev_priv->dev->mode_config.crtc_list, head) {
                if (crtc->primary->fb != &framebuffer->base)
                        continue;
                units[num_units++] = vmw_crtc_to_du(crtc);
        }

        for (k = 0; k < num_units; k++) {
                struct vmw_display_unit *unit = units[k];
                s32 crtc_x = unit->crtc.x;
                s32 crtc_y = unit->crtc.y;
                s32 crtc_width = unit->crtc.mode.hdisplay;
                s32 crtc_height = unit->crtc.mode.vdisplay;
                const struct drm_clip_rect *clips_ptr = clips;
                const struct drm_vmw_rect *vclips_ptr = vclips;

                dirty->unit = unit;
                if (dirty->fifo_reserve_size > 0) {
                        dirty->cmd = vmw_fifo_reserve(dev_priv,
                                                      dirty->fifo_reserve_size);
                        if (!dirty->cmd) {
                                DRM_ERROR("Couldn't reserve fifo space "
                                          "for dirty blits.\n");
                                return -ENOMEM;
                        }
                        memset(dirty->cmd, 0, dirty->fifo_reserve_size);
                }
                dirty->num_hits = 0;
                for (i = 0; i < num_clips; i++, clips_ptr += increment,
                       vclips_ptr += increment) {
                        s32 clip_left;
                        s32 clip_top;

                        /*
                         * Select clip array type. Note that integer type
                         * in @clips is unsigned short, whereas in @vclips
                         * it's 32-bit.
                         */
                        if (clips) {
                                dirty->fb_x = (s32) clips_ptr->x1;
                                dirty->fb_y = (s32) clips_ptr->y1;
                                dirty->unit_x2 = (s32) clips_ptr->x2 + dest_x -
                                        crtc_x;
                                dirty->unit_y2 = (s32) clips_ptr->y2 + dest_y -
                                        crtc_y;
                        } else {
                                dirty->fb_x = vclips_ptr->x;
                                dirty->fb_y = vclips_ptr->y;
                                dirty->unit_x2 = dirty->fb_x + vclips_ptr->w +
                                        dest_x - crtc_x;
                                dirty->unit_y2 = dirty->fb_y + vclips_ptr->h +
                                        dest_y - crtc_y;
                        }

                        dirty->unit_x1 = dirty->fb_x + dest_x - crtc_x;
                        dirty->unit_y1 = dirty->fb_y + dest_y - crtc_y;

                        /* Skip this clip if it's outside the crtc region */
                        if (dirty->unit_x1 >= crtc_width ||
                            dirty->unit_y1 >= crtc_height ||
                            dirty->unit_x2 <= 0 || dirty->unit_y2 <= 0)
                                continue;

                        /* Clip right and bottom to crtc limits */
                        dirty->unit_x2 = min_t(s32, dirty->unit_x2,
                                               crtc_width);
                        dirty->unit_y2 = min_t(s32, dirty->unit_y2,
                                               crtc_height);

                        /* Clip left and top to crtc limits */
                        clip_left = min_t(s32, dirty->unit_x1, 0);
                        clip_top = min_t(s32, dirty->unit_y1, 0);
                        dirty->unit_x1 -= clip_left;
                        dirty->unit_y1 -= clip_top;
                        dirty->fb_x -= clip_left;
                        dirty->fb_y -= clip_top;

                        dirty->clip(dirty);
                }

                dirty->fifo_commit(dirty);
        }

        return 0;
}

/**
 * vmw_kms_helper_buffer_prepare - Reserve and validate a buffer object before
 * command submission.
 *
 * @dev_priv. Pointer to a device private structure.
 * @buf: The buffer object
 * @interruptible: Whether to perform waits as interruptible.
 * @validate_as_mob: Whether the buffer should be validated as a MOB. If false,
 * The buffer will be validated as a GMR. Already pinned buffers will not be
 * validated.
 *
 * Returns 0 on success, negative error code on failure, -ERESTARTSYS if
 * interrupted by a signal.
 */
int vmw_kms_helper_buffer_prepare(struct vmw_private *dev_priv,
                                  struct vmw_dma_buffer *buf,
                                  bool interruptible,
                                  bool validate_as_mob)
{
        struct ttm_buffer_object *bo = &buf->base;
        int ret;

        ttm_bo_reserve(bo, false, false, interruptible, NULL);
        ret = vmw_validate_single_buffer(dev_priv, bo, interruptible,
                                         validate_as_mob);
        if (ret)
                ttm_bo_unreserve(bo);

        return ret;
}

/**
 * vmw_kms_helper_buffer_revert - Undo the actions of
 * vmw_kms_helper_buffer_prepare.
 *
 * @res: Pointer to the buffer object.
 *
 * Helper to be used if an error forces the caller to undo the actions of
 * vmw_kms_helper_buffer_prepare.
 */
void vmw_kms_helper_buffer_revert(struct vmw_dma_buffer *buf)
{
        if (buf)
                ttm_bo_unreserve(&buf->base);
}

/**
 * vmw_kms_helper_buffer_finish - Unreserve and fence a buffer object after
 * kms command submission.
 *
 * @dev_priv: Pointer to a device private structure.
 * @file_priv: Pointer to a struct drm_file representing the caller's
 * connection. Must be set to NULL if @user_fence_rep is NULL, and conversely
 * if non-NULL, @user_fence_rep must be non-NULL.
 * @buf: The buffer object.
 * @out_fence:  Optional pointer to a fence pointer. If non-NULL, a
 * ref-counted fence pointer is returned here.
 * @user_fence_rep: Optional pointer to a user-space provided struct
 * drm_vmw_fence_rep. If provided, @file_priv must also be provided and the
 * function copies fence data to user-space in a fail-safe manner.
 */
void vmw_kms_helper_buffer_finish(struct vmw_private *dev_priv,
                                  struct drm_file *file_priv,
                                  struct vmw_dma_buffer *buf,
                                  struct vmw_fence_obj **out_fence,
                                  struct drm_vmw_fence_rep __user *
                                  user_fence_rep)
{
        struct vmw_fence_obj *fence;
        uint32_t handle;
        int ret;

        ret = vmw_execbuf_fence_commands(file_priv, dev_priv, &fence,
                                         file_priv ? &handle : NULL);
        if (buf)
                vmw_fence_single_bo(&buf->base, fence);
        if (file_priv)
                vmw_execbuf_copy_fence_user(dev_priv, vmw_fpriv(file_priv),
                                            ret, user_fence_rep, fence,
                                            handle);
        if (out_fence)
                *out_fence = fence;
        else
                vmw_fence_obj_unreference(&fence);

        vmw_kms_helper_buffer_revert(buf);
}


/**
 * vmw_kms_helper_resource_revert - Undo the actions of
 * vmw_kms_helper_resource_prepare.
 *
 * @res: Pointer to the resource. Typically a surface.
 *
 * Helper to be used if an error forces the caller to undo the actions of
 * vmw_kms_helper_resource_prepare.
 */
void vmw_kms_helper_resource_revert(struct vmw_resource *res)
{
        vmw_kms_helper_buffer_revert(res->backup);
        vmw_resource_unreserve(res, false, NULL, 0);
        mutex_unlock(&res->dev_priv->cmdbuf_mutex);
}

/**
 * vmw_kms_helper_resource_prepare - Reserve and validate a resource before
 * command submission.
 *
 * @res: Pointer to the resource. Typically a surface.
 * @interruptible: Whether to perform waits as interruptible.
 *
 * Reserves and validates also the backup buffer if a guest-backed resource.
 * Returns 0 on success, negative error code on failure. -ERESTARTSYS if
 * interrupted by a signal.
 */
int vmw_kms_helper_resource_prepare(struct vmw_resource *res,
                                    bool interruptible)
{
        int ret = 0;

        if (interruptible)
                ret = mutex_lock_interruptible(&res->dev_priv->cmdbuf_mutex);
        else
                mutex_lock(&res->dev_priv->cmdbuf_mutex);

        if (unlikely(ret != 0))
                return -ERESTARTSYS;

        ret = vmw_resource_reserve(res, interruptible, false);
        if (ret)
                goto out_unlock;

        if (res->backup) {
                ret = vmw_kms_helper_buffer_prepare(res->dev_priv, res->backup,
                                                    interruptible,
                                                    res->dev_priv->has_mob);
                if (ret)
                        goto out_unreserve;
        }
        ret = vmw_resource_validate(res);
        if (ret)
                goto out_revert;
        return 0;

out_revert:
        vmw_kms_helper_buffer_revert(res->backup);
out_unreserve:
        vmw_resource_unreserve(res, false, NULL, 0);
out_unlock:
        mutex_unlock(&res->dev_priv->cmdbuf_mutex);
        return ret;
}

/**
 * vmw_kms_helper_resource_finish - Unreserve and fence a resource after
 * kms command submission.
 *
 * @res: Pointer to the resource. Typically a surface.
 * @out_fence: Optional pointer to a fence pointer. If non-NULL, a
 * ref-counted fence pointer is returned here.

 */
void vmw_kms_helper_resource_finish(struct vmw_resource *res,
                             struct vmw_fence_obj **out_fence)
{
        if (res->backup || out_fence)
                vmw_kms_helper_buffer_finish(res->dev_priv, NULL, res->backup,
                                             out_fence, NULL);

        vmw_resource_unreserve(res, false, NULL, 0);
        mutex_unlock(&res->dev_priv->cmdbuf_mutex);
}

/**
 * vmw_kms_update_proxy - Helper function to update a proxy surface from
 * its backing MOB.
 *
 * @res: Pointer to the surface resource
 * @clips: Clip rects in framebuffer (surface) space.
 * @num_clips: Number of clips in @clips.
 * @increment: Integer with which to increment the clip counter when looping.
 * Used to skip a predetermined number of clip rects.
 *
 * This function makes sure the proxy surface is updated from its backing MOB
 * using the region given by @clips. The surface resource @res and its backing
 * MOB needs to be reserved and validated on call.
 */
int vmw_kms_update_proxy(struct vmw_resource *res,
                         const struct drm_clip_rect *clips,
                         unsigned num_clips,
                         int increment)
{
        struct vmw_private *dev_priv = res->dev_priv;
        struct drm_vmw_size *size = &vmw_res_to_srf(res)->base_size;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdUpdateGBImage body;
        } *cmd;
        SVGA3dBox *box;
        size_t copy_size = 0;
        int i;

        if (!clips)
                return 0;

        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd) * num_clips);
        if (!cmd) {
                DRM_ERROR("Couldn't reserve fifo space for proxy surface "
                          "update.\n");
                return -ENOMEM;
        }

        for (i = 0; i < num_clips; ++i, clips += increment, ++cmd) {
                box = &cmd->body.box;

                cmd->header.id = SVGA_3D_CMD_UPDATE_GB_IMAGE;
                cmd->header.size = sizeof(cmd->body);
                cmd->body.image.sid = res->id;
                cmd->body.image.face = 0;
                cmd->body.image.mipmap = 0;

                if (clips->x1 > size->width || clips->x2 > size->width ||
                    clips->y1 > size->height || clips->y2 > size->height) {
                        DRM_ERROR("Invalid clips outsize of framebuffer.\n");
                        return -EINVAL;
                }

                box->x = clips->x1;
                box->y = clips->y1;
                box->z = 0;
                box->w = clips->x2 - clips->x1;
                box->h = clips->y2 - clips->y1;
                box->d = 1;

                copy_size += sizeof(*cmd);
        }

        vmw_fifo_commit(dev_priv, copy_size);

        return 0;
}

int vmw_kms_fbdev_init_data(struct vmw_private *dev_priv,
                            unsigned unit,
                            u32 max_width,
                            u32 max_height,
                            struct drm_connector **p_con,
                            struct drm_crtc **p_crtc,
                            struct drm_display_mode **p_mode)
{
        struct drm_connector *con;
        struct vmw_display_unit *du;
        struct drm_display_mode *mode;
        int i = 0;

        list_for_each_entry(con, &dev_priv->dev->mode_config.connector_list,
                            head) {
                if (i == unit)
                        break;

                ++i;
        }

        if (i != unit) {
                DRM_ERROR("Could not find initial display unit.\n");
                return -EINVAL;
        }

        if (list_empty(&con->modes))
                (void) vmw_du_connector_fill_modes(con, max_width, max_height);

        if (list_empty(&con->modes)) {
                DRM_ERROR("Could not find initial display mode.\n");
                return -EINVAL;
        }

        du = vmw_connector_to_du(con);
        *p_con = con;
        *p_crtc = &du->crtc;

        list_for_each_entry(mode, &con->modes, head) {
                if (mode->type & DRM_MODE_TYPE_PREFERRED)
                        break;
        }

        if (mode->type & DRM_MODE_TYPE_PREFERRED)
                *p_mode = mode;
        else {
                WARN_ONCE(true, "Could not find initial preferred mode.\n");
                *p_mode = list_first_entry(&con->modes,
                                           struct drm_display_mode,
                                           head);
        }

        return 0;
}

/**
 * vmw_kms_del_active - unregister a crtc binding to the implicit framebuffer
 *
 * @dev_priv: Pointer to a device private struct.
 * @du: The display unit of the crtc.
 */
void vmw_kms_del_active(struct vmw_private *dev_priv,
                        struct vmw_display_unit *du)
{
        lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);

        if (du->active_implicit) {
                if (--(dev_priv->num_implicit) == 0)
                        dev_priv->implicit_fb = NULL;
                du->active_implicit = false;
        }
}

/**
 * vmw_kms_add_active - register a crtc binding to an implicit framebuffer
 *
 * @vmw_priv: Pointer to a device private struct.
 * @du: The display unit of the crtc.
 * @vfb: The implicit framebuffer
 *
 * Registers a binding to an implicit framebuffer.
 */
void vmw_kms_add_active(struct vmw_private *dev_priv,
                        struct vmw_display_unit *du,
                        struct vmw_framebuffer *vfb)
{
        lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);

        WARN_ON_ONCE(!dev_priv->num_implicit && dev_priv->implicit_fb);

        if (!du->active_implicit && du->is_implicit) {
                dev_priv->implicit_fb = vfb;
                du->active_implicit = true;
                dev_priv->num_implicit++;
        }
}

/**
 * vmw_kms_screen_object_flippable - Check whether we can page-flip a crtc.
 *
 * @dev_priv: Pointer to device-private struct.
 * @crtc: The crtc we want to flip.
 *
 * Returns true or false depending whether it's OK to flip this crtc
 * based on the criterion that we must not have more than one implicit
 * frame-buffer at any one time.
 */
bool vmw_kms_crtc_flippable(struct vmw_private *dev_priv,
                            struct drm_crtc *crtc)
{
        struct vmw_display_unit *du = vmw_crtc_to_du(crtc);

        lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);

        if (!du->is_implicit)
                return true;

        if (dev_priv->num_implicit != 1)
                return false;

        return true;
}

/**
 * vmw_kms_update_implicit_fb - Update the implicit fb.
 *
 * @dev_priv: Pointer to device-private struct.
 * @crtc: The crtc the new implicit frame-buffer is bound to.
 */
void vmw_kms_update_implicit_fb(struct vmw_private *dev_priv,
                                struct drm_crtc *crtc)
{
        struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
        struct vmw_framebuffer *vfb;

        lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);

        if (!du->is_implicit)
                return;

        vfb = vmw_framebuffer_to_vfb(crtc->primary->fb);
        WARN_ON_ONCE(dev_priv->num_implicit != 1 &&
                     dev_priv->implicit_fb != vfb);

        dev_priv->implicit_fb = vfb;
}

/**
 * vmw_kms_create_implicit_placement_proparty - Set up the implicit placement
 * property.
 *
 * @dev_priv: Pointer to a device private struct.
 * @immutable: Whether the property is immutable.
 *
 * Sets up the implicit placement property unless it's already set up.
 */
void
vmw_kms_create_implicit_placement_property(struct vmw_private *dev_priv,
                                           bool immutable)
{
        if (dev_priv->implicit_placement_property)
                return;

        dev_priv->implicit_placement_property =
                drm_property_create_range(dev_priv->dev,
                                          immutable ?
                                          DRM_MODE_PROP_IMMUTABLE : 0,
                                          "implicit_placement", 0, 1);

}