/*
 * Copyright 2013 Red Hat Inc.
 *
 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Dave Airlie
 *          Alon Levy
 */


#include <linux/crc32.h>

#include "qxl_drv.h"
#include "qxl_object.h"
#include "drm_crtc_helper.h"
#include <drm/drm_plane_helper.h>

static bool qxl_head_enabled(struct qxl_head *head)
{
        return head->width && head->height;
}

void qxl_alloc_client_monitors_config(struct qxl_device *qdev, unsigned count)
{
        if (qdev->client_monitors_config &&
            count > qdev->client_monitors_config->count) {
                kfree(qdev->client_monitors_config);
                qdev->client_monitors_config = NULL;
        }
        if (!qdev->client_monitors_config) {
                qdev->client_monitors_config = kzalloc(
                                sizeof(struct qxl_monitors_config) +
                                sizeof(struct qxl_head) * count, GFP_KERNEL);
                if (!qdev->client_monitors_config) {
                        qxl_io_log(qdev,
                                   "%s: allocation failure for %u heads\n",
                                   __func__, count);
                        return;
                }
        }
        qdev->client_monitors_config->count = count;
}

static int qxl_display_copy_rom_client_monitors_config(struct qxl_device *qdev)
{
        int i;
        int num_monitors;
        uint32_t crc;

        num_monitors = qdev->rom->client_monitors_config.count;
        crc = crc32(0, (const uint8_t *)&qdev->rom->client_monitors_config,
                  sizeof(qdev->rom->client_monitors_config));
        if (crc != qdev->rom->client_monitors_config_crc) {
                qxl_io_log(qdev, "crc mismatch: have %X (%d) != %X\n", crc,
                           sizeof(qdev->rom->client_monitors_config),
                           qdev->rom->client_monitors_config_crc);
                return 1;
        }
        if (num_monitors > qdev->monitors_config->max_allowed) {
                DRM_DEBUG_KMS("client monitors list will be truncated: %d < %d\n",
                              qdev->monitors_config->max_allowed, num_monitors);
                num_monitors = qdev->monitors_config->max_allowed;
        } else {
                num_monitors = qdev->rom->client_monitors_config.count;
        }
        qxl_alloc_client_monitors_config(qdev, num_monitors);
        /* we copy max from the client but it isn't used */
        qdev->client_monitors_config->max_allowed =
                                qdev->monitors_config->max_allowed;
        for (i = 0 ; i < qdev->client_monitors_config->count ; ++i) {
                struct qxl_urect *c_rect =
                        &qdev->rom->client_monitors_config.heads[i];
                struct qxl_head *client_head =
                        &qdev->client_monitors_config->heads[i];
                client_head->x = c_rect->left;
                client_head->y = c_rect->top;
                client_head->width = c_rect->right - c_rect->left;
                client_head->height = c_rect->bottom - c_rect->top;
                client_head->surface_id = 0;
                client_head->id = i;
                client_head->flags = 0;
                DRM_DEBUG_KMS("read %dx%d+%d+%d\n", client_head->width, client_head->height,
                          client_head->x, client_head->y);
        }
        return 0;
}

static void qxl_update_offset_props(struct qxl_device *qdev)
{
        struct drm_device *dev = qdev->ddev;
        struct drm_connector *connector;
        struct qxl_output *output;
        struct qxl_head *head;

        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                output = drm_connector_to_qxl_output(connector);

                head = &qdev->client_monitors_config->heads[output->index];

                drm_object_property_set_value(&connector->base,
                        dev->mode_config.suggested_x_property, head->x);
                drm_object_property_set_value(&connector->base,
                        dev->mode_config.suggested_y_property, head->y);
        }
}

void qxl_display_read_client_monitors_config(struct qxl_device *qdev)
{

        struct drm_device *dev = qdev->ddev;
        while (qxl_display_copy_rom_client_monitors_config(qdev)) {
                qxl_io_log(qdev, "failed crc check for client_monitors_config,"
                                 " retrying\n");
        }

        drm_modeset_lock_all(dev);
        qxl_update_offset_props(qdev);
        drm_modeset_unlock_all(dev);
        if (!drm_helper_hpd_irq_event(qdev->ddev)) {
                /* notify that the monitor configuration changed, to
                   adjust at the arbitrary resolution */
                drm_kms_helper_hotplug_event(qdev->ddev);
        }
}

static int qxl_add_monitors_config_modes(struct drm_connector *connector,
                                         unsigned *pwidth,
                                         unsigned *pheight)
{
        struct drm_device *dev = connector->dev;
        struct qxl_device *qdev = dev->dev_private;
        struct qxl_output *output = drm_connector_to_qxl_output(connector);
        int h = output->index;
        struct drm_display_mode *mode = NULL;
        struct qxl_head *head;

        if (!qdev->client_monitors_config)
                return 0;
        head = &qdev->client_monitors_config->heads[h];

        mode = drm_cvt_mode(dev, head->width, head->height, 60, false, false,
                            false);
        mode->type |= DRM_MODE_TYPE_PREFERRED;
        *pwidth = head->width;
        *pheight = head->height;
        drm_mode_probed_add(connector, mode);
        return 1;
}

static int qxl_add_common_modes(struct drm_connector *connector,
                                unsigned pwidth,
                                unsigned pheight)
{
        struct drm_device *dev = connector->dev;
        struct drm_display_mode *mode = NULL;
        int i;
        struct mode_size {
                int w;
                int h;
        } common_modes[] = {
                { 640,  480},
                { 720,  480},
                { 800,  600},
                { 848,  480},
                {1024,  768},
                {1152,  768},
                {1280,  720},
                {1280,  800},
                {1280,  854},
                {1280,  960},
                {1280, 1024},
                {1440,  900},
                {1400, 1050},
                {1680, 1050},
                {1600, 1200},
                {1920, 1080},
                {1920, 1200}
        };

        for (i = 0; i < ARRAY_SIZE(common_modes); i++) {
                mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h,
                                    60, false, false, false);
                if (common_modes[i].w == pwidth && common_modes[i].h == pheight)
                        mode->type |= DRM_MODE_TYPE_PREFERRED;
                drm_mode_probed_add(connector, mode);
        }
        return i - 1;
}

static void qxl_crtc_destroy(struct drm_crtc *crtc)
{
        struct qxl_crtc *qxl_crtc = to_qxl_crtc(crtc);

        drm_crtc_cleanup(crtc);
        kfree(qxl_crtc);
}

static int qxl_crtc_page_flip(struct drm_crtc *crtc,
                              struct drm_framebuffer *fb,
                              struct drm_pending_vblank_event *event,
                              uint32_t page_flip_flags)
{
        struct drm_device *dev = crtc->dev;
        struct qxl_device *qdev = dev->dev_private;
        struct qxl_crtc *qcrtc = to_qxl_crtc(crtc);
        struct qxl_framebuffer *qfb_src = to_qxl_framebuffer(fb);
        struct qxl_framebuffer *qfb_old = to_qxl_framebuffer(crtc->primary->fb);
        struct qxl_bo *bo_old = gem_to_qxl_bo(qfb_old->obj);
        struct qxl_bo *bo = gem_to_qxl_bo(qfb_src->obj);
        unsigned long flags;
        struct drm_clip_rect norect = {
            .x1 = 0,
            .y1 = 0,
            .x2 = fb->width,
            .y2 = fb->height
        };
        int inc = 1;
        int one_clip_rect = 1;
        int ret = 0;

        crtc->primary->fb = fb;
        bo_old->is_primary = false;
        bo->is_primary = true;

        ret = qxl_bo_reserve(bo, false);
        if (ret)
                return ret;

        qxl_draw_dirty_fb(qdev, qfb_src, bo, 0, 0,
                          &norect, one_clip_rect, inc);

        drm_vblank_get(dev, qcrtc->index);

        if (event) {
                spin_lock_irqsave(&dev->event_lock, flags);
                drm_send_vblank_event(dev, qcrtc->index, event);
                spin_unlock_irqrestore(&dev->event_lock, flags);
        }
        drm_vblank_put(dev, qcrtc->index);

        qxl_bo_unreserve(bo);

        return 0;
}

static int
qxl_hide_cursor(struct qxl_device *qdev)
{
        struct qxl_release *release;
        struct qxl_cursor_cmd *cmd;
        int ret;

        ret = qxl_alloc_release_reserved(qdev, sizeof(*cmd), QXL_RELEASE_CURSOR_CMD,
                                         &release, NULL);
        if (ret)
                return ret;

        ret = qxl_release_reserve_list(release, true);
        if (ret) {
                qxl_release_free(qdev, release);
                return ret;
        }

        cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev, release);
        cmd->type = QXL_CURSOR_HIDE;
        qxl_release_unmap(qdev, release, &cmd->release_info);

        qxl_push_cursor_ring_release(qdev, release, QXL_CMD_CURSOR, false);
        qxl_release_fence_buffer_objects(release);
        return 0;
}

static int qxl_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 drm_device *dev = crtc->dev;
        struct qxl_device *qdev = dev->dev_private;
        struct qxl_crtc *qcrtc = to_qxl_crtc(crtc);
        struct drm_gem_object *obj;
        struct qxl_cursor *cursor;
        struct qxl_cursor_cmd *cmd;
        struct qxl_bo *cursor_bo, *user_bo;
        struct qxl_release *release;
        void *user_ptr;

        int size = 64*64*4;
        int ret = 0;
        if (!handle)
                return qxl_hide_cursor(qdev);

        obj = drm_gem_object_lookup(crtc->dev, file_priv, handle);
        if (!obj) {
                DRM_ERROR("cannot find cursor object\n");
                return -ENOENT;
        }

        user_bo = gem_to_qxl_bo(obj);

        ret = qxl_bo_reserve(user_bo, false);
        if (ret)
                goto out_unref;

        ret = qxl_bo_pin(user_bo, QXL_GEM_DOMAIN_CPU, NULL);
        qxl_bo_unreserve(user_bo);
        if (ret)
                goto out_unref;

        ret = qxl_bo_kmap(user_bo, &user_ptr);
        if (ret)
                goto out_unpin;

        ret = qxl_alloc_release_reserved(qdev, sizeof(*cmd),
                                         QXL_RELEASE_CURSOR_CMD,
                                         &release, NULL);
        if (ret)
                goto out_kunmap;

        ret = qxl_alloc_bo_reserved(qdev, release, sizeof(struct qxl_cursor) + size,
                           &cursor_bo);
        if (ret)
                goto out_free_release;

        ret = qxl_release_reserve_list(release, false);
        if (ret)
                goto out_free_bo;

        ret = qxl_bo_kmap(cursor_bo, (void **)&cursor);
        if (ret)
                goto out_backoff;

        cursor->header.unique = 0;
        cursor->header.type = SPICE_CURSOR_TYPE_ALPHA;
        cursor->header.width = 64;
        cursor->header.height = 64;
        cursor->header.hot_spot_x = hot_x;
        cursor->header.hot_spot_y = hot_y;
        cursor->data_size = size;
        cursor->chunk.next_chunk = 0;
        cursor->chunk.prev_chunk = 0;
        cursor->chunk.data_size = size;

        memcpy(cursor->chunk.data, user_ptr, size);

        qxl_bo_kunmap(cursor_bo);

        qxl_bo_kunmap(user_bo);

        cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev, release);
        cmd->type = QXL_CURSOR_SET;
        cmd->u.set.position.x = qcrtc->cur_x;
        cmd->u.set.position.y = qcrtc->cur_y;

        cmd->u.set.shape = qxl_bo_physical_address(qdev, cursor_bo, 0);

        cmd->u.set.visible = 1;
        qxl_release_unmap(qdev, release, &cmd->release_info);

        qxl_push_cursor_ring_release(qdev, release, QXL_CMD_CURSOR, false);
        qxl_release_fence_buffer_objects(release);

        /* finish with the userspace bo */
        ret = qxl_bo_reserve(user_bo, false);
        if (!ret) {
                qxl_bo_unpin(user_bo);
                qxl_bo_unreserve(user_bo);
        }
        drm_gem_object_unreference_unlocked(obj);

        qxl_bo_unref(&cursor_bo);

        return ret;

out_backoff:
        qxl_release_backoff_reserve_list(release);
out_free_bo:
        qxl_bo_unref(&cursor_bo);
out_free_release:
        qxl_release_free(qdev, release);
out_kunmap:
        qxl_bo_kunmap(user_bo);
out_unpin:
        qxl_bo_unpin(user_bo);
out_unref:
        drm_gem_object_unreference_unlocked(obj);
        return ret;
}

static int qxl_crtc_cursor_move(struct drm_crtc *crtc,
                                int x, int y)
{
        struct drm_device *dev = crtc->dev;
        struct qxl_device *qdev = dev->dev_private;
        struct qxl_crtc *qcrtc = to_qxl_crtc(crtc);
        struct qxl_release *release;
        struct qxl_cursor_cmd *cmd;
        int ret;

        ret = qxl_alloc_release_reserved(qdev, sizeof(*cmd), QXL_RELEASE_CURSOR_CMD,
                                   &release, NULL);
        if (ret)
                return ret;

        ret = qxl_release_reserve_list(release, true);
        if (ret) {
                qxl_release_free(qdev, release);
                return ret;
        }

        qcrtc->cur_x = x;
        qcrtc->cur_y = y;

        cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev, release);
        cmd->type = QXL_CURSOR_MOVE;
        cmd->u.position.x = qcrtc->cur_x;
        cmd->u.position.y = qcrtc->cur_y;
        qxl_release_unmap(qdev, release, &cmd->release_info);

        qxl_push_cursor_ring_release(qdev, release, QXL_CMD_CURSOR, false);
        qxl_release_fence_buffer_objects(release);

        return 0;
}


static const struct drm_crtc_funcs qxl_crtc_funcs = {
        .cursor_set2 = qxl_crtc_cursor_set2,
        .cursor_move = qxl_crtc_cursor_move,
        .set_config = drm_crtc_helper_set_config,
        .destroy = qxl_crtc_destroy,
        .page_flip = qxl_crtc_page_flip,
};

static void qxl_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
        struct qxl_framebuffer *qxl_fb = to_qxl_framebuffer(fb);

        if (qxl_fb->obj)
                drm_gem_object_unreference_unlocked(qxl_fb->obj);
        drm_framebuffer_cleanup(fb);
        kfree(qxl_fb);
}

static int qxl_framebuffer_surface_dirty(struct drm_framebuffer *fb,
                                         struct drm_file *file_priv,
                                         unsigned flags, unsigned color,
                                         struct drm_clip_rect *clips,
                                         unsigned num_clips)
{
        /* TODO: vmwgfx where this was cribbed from had locking. Why? */
        struct qxl_framebuffer *qxl_fb = to_qxl_framebuffer(fb);
        struct qxl_device *qdev = qxl_fb->base.dev->dev_private;
        struct drm_clip_rect norect;
        struct qxl_bo *qobj;
        int inc = 1;

        drm_modeset_lock_all(fb->dev);

        qobj = gem_to_qxl_bo(qxl_fb->obj);
        /* if we aren't primary surface ignore this */
        if (!qobj->is_primary) {
                drm_modeset_unlock_all(fb->dev);
                return 0;
        }

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

        qxl_draw_dirty_fb(qdev, qxl_fb, qobj, flags, color,
                          clips, num_clips, inc);

        drm_modeset_unlock_all(fb->dev);

        return 0;
}

static const struct drm_framebuffer_funcs qxl_fb_funcs = {
        .destroy = qxl_user_framebuffer_destroy,
        .dirty = qxl_framebuffer_surface_dirty,
/*      TODO?
 *      .create_handle = qxl_user_framebuffer_create_handle, */
};

int
qxl_framebuffer_init(struct drm_device *dev,
                     struct qxl_framebuffer *qfb,
                     struct drm_mode_fb_cmd2 *mode_cmd,
                     struct drm_gem_object *obj)
{
        int ret;

        qfb->obj = obj;
        ret = drm_framebuffer_init(dev, &qfb->base, &qxl_fb_funcs);
        if (ret) {
                qfb->obj = NULL;
                return ret;
        }
        drm_helper_mode_fill_fb_struct(&qfb->base, mode_cmd);
        return 0;
}

static void qxl_crtc_dpms(struct drm_crtc *crtc, int mode)
{
}

static bool qxl_crtc_mode_fixup(struct drm_crtc *crtc,
                                  const struct drm_display_mode *mode,
                                  struct drm_display_mode *adjusted_mode)
{
        struct drm_device *dev = crtc->dev;
        struct qxl_device *qdev = dev->dev_private;

        qxl_io_log(qdev, "%s: (%d,%d) => (%d,%d)\n",
                   __func__,
                   mode->hdisplay, mode->vdisplay,
                   adjusted_mode->hdisplay,
                   adjusted_mode->vdisplay);
        return true;
}

void
qxl_send_monitors_config(struct qxl_device *qdev)
{
        int i;

        BUG_ON(!qdev->ram_header->monitors_config);

        if (qdev->monitors_config->count == 0) {
                qxl_io_log(qdev, "%s: 0 monitors??\n", __func__);
                return;
        }
        for (i = 0 ; i < qdev->monitors_config->count ; ++i) {
                struct qxl_head *head = &qdev->monitors_config->heads[i];

                if (head->y > 8192 || head->x > 8192 ||
                    head->width > 8192 || head->height > 8192) {
                        DRM_ERROR("head %d wrong: %dx%d+%d+%d\n",
                                  i, head->width, head->height,
                                  head->x, head->y);
                        return;
                }
        }
        qxl_io_monitors_config(qdev);
}

static void qxl_monitors_config_set(struct qxl_device *qdev,
                                    int index,
                                    unsigned x, unsigned y,
                                    unsigned width, unsigned height,
                                    unsigned surf_id)
{
        DRM_DEBUG_KMS("%d:%dx%d+%d+%d\n", index, width, height, x, y);
        qdev->monitors_config->heads[index].x = x;
        qdev->monitors_config->heads[index].y = y;
        qdev->monitors_config->heads[index].width = width;
        qdev->monitors_config->heads[index].height = height;
        qdev->monitors_config->heads[index].surface_id = surf_id;

}

static int qxl_crtc_mode_set(struct drm_crtc *crtc,
                               struct drm_display_mode *mode,
                               struct drm_display_mode *adjusted_mode,
                               int x, int y,
                               struct drm_framebuffer *old_fb)
{
        struct drm_device *dev = crtc->dev;
        struct qxl_device *qdev = dev->dev_private;
        struct qxl_framebuffer *qfb;
        struct qxl_bo *bo, *old_bo = NULL;
        struct qxl_crtc *qcrtc = to_qxl_crtc(crtc);
        bool recreate_primary = false;
        int ret;
        int surf_id;
        if (!crtc->primary->fb) {
                DRM_DEBUG_KMS("No FB bound\n");
                return 0;
        }

        if (old_fb) {
                qfb = to_qxl_framebuffer(old_fb);
                old_bo = gem_to_qxl_bo(qfb->obj);
        }
        qfb = to_qxl_framebuffer(crtc->primary->fb);
        bo = gem_to_qxl_bo(qfb->obj);
        DRM_DEBUG("+%d+%d (%d,%d) => (%d,%d)\n",
                  x, y,
                  mode->hdisplay, mode->vdisplay,
                  adjusted_mode->hdisplay,
                  adjusted_mode->vdisplay);

        if (qcrtc->index == 0)
                recreate_primary = true;

        if (bo->surf.stride * bo->surf.height > qdev->vram_size) {
                DRM_ERROR("Mode doesn't fit in vram size (vgamem)");
                return -EINVAL;
        }

        ret = qxl_bo_reserve(bo, false);
        if (ret != 0)
                return ret;
        ret = qxl_bo_pin(bo, bo->type, NULL);
        if (ret != 0) {
                qxl_bo_unreserve(bo);
                return -EINVAL;
        }
        qxl_bo_unreserve(bo);
        if (recreate_primary) {
                qxl_io_destroy_primary(qdev);
                qxl_io_log(qdev,
                           "recreate primary: %dx%d,%d,%d\n",
                           bo->surf.width, bo->surf.height,
                           bo->surf.stride, bo->surf.format);
                qxl_io_create_primary(qdev, 0, bo);
                bo->is_primary = true;
        }

        if (bo->is_primary) {
                DRM_DEBUG_KMS("setting surface_id to 0 for primary surface %d on crtc %d\n", bo->surface_id, qcrtc->index);
                surf_id = 0;
        } else {
                surf_id = bo->surface_id;
        }

        if (old_bo && old_bo != bo) {
                old_bo->is_primary = false;
                ret = qxl_bo_reserve(old_bo, false);
                qxl_bo_unpin(old_bo);
                qxl_bo_unreserve(old_bo);
        }

        qxl_monitors_config_set(qdev, qcrtc->index, x, y,
                                mode->hdisplay,
                                mode->vdisplay, surf_id);
        return 0;
}

static void qxl_crtc_prepare(struct drm_crtc *crtc)
{
        DRM_DEBUG("current: %dx%d+%d+%d (%d).\n",
                  crtc->mode.hdisplay, crtc->mode.vdisplay,
                  crtc->x, crtc->y, crtc->enabled);
}

static void qxl_crtc_commit(struct drm_crtc *crtc)
{
        DRM_DEBUG("\n");
}

static void qxl_crtc_disable(struct drm_crtc *crtc)
{
        struct qxl_crtc *qcrtc = to_qxl_crtc(crtc);
        struct drm_device *dev = crtc->dev;
        struct qxl_device *qdev = dev->dev_private;
        if (crtc->primary->fb) {
                struct qxl_framebuffer *qfb = to_qxl_framebuffer(crtc->primary->fb);
                struct qxl_bo *bo = gem_to_qxl_bo(qfb->obj);
                int ret;
                ret = qxl_bo_reserve(bo, false);
                qxl_bo_unpin(bo);
                qxl_bo_unreserve(bo);
                crtc->primary->fb = NULL;
        }

        qxl_monitors_config_set(qdev, qcrtc->index, 0, 0, 0, 0, 0);

        qxl_send_monitors_config(qdev);
}

static const struct drm_crtc_helper_funcs qxl_crtc_helper_funcs = {
        .dpms = qxl_crtc_dpms,
        .disable = qxl_crtc_disable,
        .mode_fixup = qxl_crtc_mode_fixup,
        .mode_set = qxl_crtc_mode_set,
        .prepare = qxl_crtc_prepare,
        .commit = qxl_crtc_commit,
};

static int qdev_crtc_init(struct drm_device *dev, int crtc_id)
{
        struct qxl_crtc *qxl_crtc;

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

        drm_crtc_init(dev, &qxl_crtc->base, &qxl_crtc_funcs);
        qxl_crtc->index = crtc_id;
        drm_mode_crtc_set_gamma_size(&qxl_crtc->base, 256);
        drm_crtc_helper_add(&qxl_crtc->base, &qxl_crtc_helper_funcs);
        return 0;
}

static void qxl_enc_dpms(struct drm_encoder *encoder, int mode)
{
        DRM_DEBUG("\n");
}

static bool qxl_enc_mode_fixup(struct drm_encoder *encoder,
                               const struct drm_display_mode *mode,
                               struct drm_display_mode *adjusted_mode)
{
        DRM_DEBUG("\n");
        return true;
}

static void qxl_enc_prepare(struct drm_encoder *encoder)
{
        DRM_DEBUG("\n");
}

static void qxl_write_monitors_config_for_encoder(struct qxl_device *qdev,
                struct drm_encoder *encoder)
{
        int i;
        struct qxl_output *output = drm_encoder_to_qxl_output(encoder);
        struct qxl_head *head;
        struct drm_display_mode *mode;

        BUG_ON(!encoder);
        /* TODO: ugly, do better */
        i = output->index;
        if (!qdev->monitors_config ||
            qdev->monitors_config->max_allowed <= i) {
                DRM_ERROR(
                "head number too large or missing monitors config: %p, %d",
                qdev->monitors_config,
                qdev->monitors_config ?
                        qdev->monitors_config->max_allowed : -1);
                return;
        }
        if (!encoder->crtc) {
                DRM_ERROR("missing crtc on encoder %p\n", encoder);
                return;
        }
        if (i != 0)
                DRM_DEBUG("missing for multiple monitors: no head holes\n");
        head = &qdev->monitors_config->heads[i];
        head->id = i;
        if (encoder->crtc->enabled) {
                mode = &encoder->crtc->mode;
                head->width = mode->hdisplay;
                head->height = mode->vdisplay;
                head->x = encoder->crtc->x;
                head->y = encoder->crtc->y;
                if (qdev->monitors_config->count < i + 1)
                        qdev->monitors_config->count = i + 1;
        } else {
                head->width = 0;
                head->height = 0;
                head->x = 0;
                head->y = 0;
        }
        DRM_DEBUG_KMS("setting head %d to +%d+%d %dx%d out of %d\n",
                      i, head->x, head->y, head->width, head->height, qdev->monitors_config->count);
        head->flags = 0;
        /* TODO - somewhere else to call this for multiple monitors
         * (config_commit?) */
        qxl_send_monitors_config(qdev);
}

static void qxl_enc_commit(struct drm_encoder *encoder)
{
        struct qxl_device *qdev = encoder->dev->dev_private;

        qxl_write_monitors_config_for_encoder(qdev, encoder);
        DRM_DEBUG("\n");
}

static void qxl_enc_mode_set(struct drm_encoder *encoder,
                                struct drm_display_mode *mode,
                                struct drm_display_mode *adjusted_mode)
{
        DRM_DEBUG("\n");
}

static int qxl_conn_get_modes(struct drm_connector *connector)
{
        int ret = 0;
        struct qxl_device *qdev = connector->dev->dev_private;
        unsigned pwidth = 1024;
        unsigned pheight = 768;

        DRM_DEBUG_KMS("monitors_config=%p\n", qdev->monitors_config);
        /* TODO: what should we do here? only show the configured modes for the
         * device, or allow the full list, or both? */
        if (qdev->monitors_config && qdev->monitors_config->count) {
                ret = qxl_add_monitors_config_modes(connector, &pwidth, &pheight);
                if (ret < 0)
                        return ret;
        }
        ret += qxl_add_common_modes(connector, pwidth, pheight);
        return ret;
}

static int qxl_conn_mode_valid(struct drm_connector *connector,
                               struct drm_display_mode *mode)
{
        /* TODO: is this called for user defined modes? (xrandr --add-mode)
         * TODO: check that the mode fits in the framebuffer */
        DRM_DEBUG("%s: %dx%d status=%d\n", mode->name, mode->hdisplay,
                  mode->vdisplay, mode->status);
        return MODE_OK;
}

static struct drm_encoder *qxl_best_encoder(struct drm_connector *connector)
{
        struct qxl_output *qxl_output =
                drm_connector_to_qxl_output(connector);

        DRM_DEBUG("\n");
        return &qxl_output->enc;
}


static const struct drm_encoder_helper_funcs qxl_enc_helper_funcs = {
        .dpms = qxl_enc_dpms,
        .mode_fixup = qxl_enc_mode_fixup,
        .prepare = qxl_enc_prepare,
        .mode_set = qxl_enc_mode_set,
        .commit = qxl_enc_commit,
};

static const struct drm_connector_helper_funcs qxl_connector_helper_funcs = {
        .get_modes = qxl_conn_get_modes,
        .mode_valid = qxl_conn_mode_valid,
        .best_encoder = qxl_best_encoder,
};

static void qxl_conn_save(struct drm_connector *connector)
{
        DRM_DEBUG("\n");
}

static void qxl_conn_restore(struct drm_connector *connector)
{
        DRM_DEBUG("\n");
}

static enum drm_connector_status qxl_conn_detect(
                        struct drm_connector *connector,
                        bool force)
{
        struct qxl_output *output =
                drm_connector_to_qxl_output(connector);
        struct drm_device *ddev = connector->dev;
        struct qxl_device *qdev = ddev->dev_private;
        int connected;

        /* The first monitor is always connected */
        connected = (output->index == 0) ||
                    (qdev->client_monitors_config &&
                     qdev->client_monitors_config->count > output->index &&
                     qxl_head_enabled(&qdev->client_monitors_config->heads[output->index]));

        DRM_DEBUG("#%d connected: %d\n", output->index, connected);
        if (!connected)
                qxl_monitors_config_set(qdev, output->index, 0, 0, 0, 0, 0);

        return connected ? connector_status_connected
                         : connector_status_disconnected;
}

static int qxl_conn_set_property(struct drm_connector *connector,
                                   struct drm_property *property,
                                   uint64_t value)
{
        DRM_DEBUG("\n");
        return 0;
}

static void qxl_conn_destroy(struct drm_connector *connector)
{
        struct qxl_output *qxl_output =
                drm_connector_to_qxl_output(connector);

        drm_connector_unregister(connector);
        drm_connector_cleanup(connector);
        kfree(qxl_output);
}

static const struct drm_connector_funcs qxl_connector_funcs = {
        .dpms = drm_helper_connector_dpms,
        .save = qxl_conn_save,
        .restore = qxl_conn_restore,
        .detect = qxl_conn_detect,
        .fill_modes = drm_helper_probe_single_connector_modes_nomerge,
        .set_property = qxl_conn_set_property,
        .destroy = qxl_conn_destroy,
};

static void qxl_enc_destroy(struct drm_encoder *encoder)
{
        drm_encoder_cleanup(encoder);
}

static const struct drm_encoder_funcs qxl_enc_funcs = {
        .destroy = qxl_enc_destroy,
};

static int qxl_mode_create_hotplug_mode_update_property(struct qxl_device *qdev)
{
        if (qdev->hotplug_mode_update_property)
                return 0;

        qdev->hotplug_mode_update_property =
                drm_property_create_range(qdev->ddev, DRM_MODE_PROP_IMMUTABLE,
                                          "hotplug_mode_update", 0, 1);

        return 0;
}

static int qdev_output_init(struct drm_device *dev, int num_output)
{
        struct qxl_device *qdev = dev->dev_private;
        struct qxl_output *qxl_output;
        struct drm_connector *connector;
        struct drm_encoder *encoder;

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

        qxl_output->index = num_output;

        connector = &qxl_output->base;
        encoder = &qxl_output->enc;
        drm_connector_init(dev, &qxl_output->base,
                           &qxl_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);

        drm_encoder_init(dev, &qxl_output->enc, &qxl_enc_funcs,
                         DRM_MODE_ENCODER_VIRTUAL);

        /* we get HPD via client monitors config */
        connector->polled = DRM_CONNECTOR_POLL_HPD;
        encoder->possible_crtcs = 1 << num_output;
        drm_mode_connector_attach_encoder(&qxl_output->base,
                                          &qxl_output->enc);
        drm_encoder_helper_add(encoder, &qxl_enc_helper_funcs);
        drm_connector_helper_add(connector, &qxl_connector_helper_funcs);

        drm_object_attach_property(&connector->base,
                                   qdev->hotplug_mode_update_property, 0);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.suggested_x_property, 0);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.suggested_y_property, 0);
        drm_connector_register(connector);
        return 0;
}

static struct drm_framebuffer *
qxl_user_framebuffer_create(struct drm_device *dev,
                            struct drm_file *file_priv,
                            struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_gem_object *obj;
        struct qxl_framebuffer *qxl_fb;
        int ret;

        obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);

        qxl_fb = kzalloc(sizeof(*qxl_fb), GFP_KERNEL);
        if (qxl_fb == NULL)
                return NULL;

        ret = qxl_framebuffer_init(dev, qxl_fb, mode_cmd, obj);
        if (ret) {
                kfree(qxl_fb);
                drm_gem_object_unreference_unlocked(obj);
                return NULL;
        }

        return &qxl_fb->base;
}

static const struct drm_mode_config_funcs qxl_mode_funcs = {
        .fb_create = qxl_user_framebuffer_create,
};

int qxl_create_monitors_object(struct qxl_device *qdev)
{
        int ret;
        struct drm_gem_object *gobj;
        int max_allowed = qxl_num_crtc;
        int monitors_config_size = sizeof(struct qxl_monitors_config) +
                max_allowed * sizeof(struct qxl_head);

        ret = qxl_gem_object_create(qdev, monitors_config_size, 0,
                                    QXL_GEM_DOMAIN_VRAM,
                                    false, false, NULL, &gobj);
        if (ret) {
                DRM_ERROR("%s: failed to create gem ret=%d\n", __func__, ret);
                return -ENOMEM;
        }
        qdev->monitors_config_bo = gem_to_qxl_bo(gobj);

        ret = qxl_bo_reserve(qdev->monitors_config_bo, false);
        if (ret)
                return ret;

        ret = qxl_bo_pin(qdev->monitors_config_bo, QXL_GEM_DOMAIN_VRAM, NULL);
        if (ret) {
                qxl_bo_unreserve(qdev->monitors_config_bo);
                return ret;
        }

        qxl_bo_unreserve(qdev->monitors_config_bo);

        qxl_bo_kmap(qdev->monitors_config_bo, NULL);

        qdev->monitors_config = qdev->monitors_config_bo->kptr;
        qdev->ram_header->monitors_config =
                qxl_bo_physical_address(qdev, qdev->monitors_config_bo, 0);

        memset(qdev->monitors_config, 0, monitors_config_size);
        qdev->monitors_config->max_allowed = max_allowed;
        return 0;
}

int qxl_destroy_monitors_object(struct qxl_device *qdev)
{
        int ret;

        qdev->monitors_config = NULL;
        qdev->ram_header->monitors_config = 0;

        qxl_bo_kunmap(qdev->monitors_config_bo);
        ret = qxl_bo_reserve(qdev->monitors_config_bo, false);
        if (ret)
                return ret;

        qxl_bo_unpin(qdev->monitors_config_bo);
        qxl_bo_unreserve(qdev->monitors_config_bo);

        qxl_bo_unref(&qdev->monitors_config_bo);
        return 0;
}

int qxl_modeset_init(struct qxl_device *qdev)
{
        int i;
        int ret;

        drm_mode_config_init(qdev->ddev);

        ret = qxl_create_monitors_object(qdev);
        if (ret)
                return ret;

        qdev->ddev->mode_config.funcs = (void *)&qxl_mode_funcs;

        /* modes will be validated against the framebuffer size */
        qdev->ddev->mode_config.min_width = 320;
        qdev->ddev->mode_config.min_height = 200;
        qdev->ddev->mode_config.max_width = 8192;
        qdev->ddev->mode_config.max_height = 8192;

        qdev->ddev->mode_config.fb_base = qdev->vram_base;

        drm_mode_create_suggested_offset_properties(qdev->ddev);
        qxl_mode_create_hotplug_mode_update_property(qdev);

        for (i = 0 ; i < qxl_num_crtc; ++i) {
                qdev_crtc_init(qdev->ddev, i);
                qdev_output_init(qdev->ddev, i);
        }

        qdev->mode_info.mode_config_initialized = true;

        /* primary surface must be created by this point, to allow
         * issuing command queue commands and having them read by
         * spice server. */
        qxl_fbdev_init(qdev);
        return 0;
}

void qxl_modeset_fini(struct qxl_device *qdev)
{
        qxl_fbdev_fini(qdev);

        qxl_destroy_monitors_object(qdev);
        if (qdev->mode_info.mode_config_initialized) {
                drm_mode_config_cleanup(qdev->ddev);
                qdev->mode_info.mode_config_initialized = false;
        }
}