// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
 *
 * 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 <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_rect.h>
#include <drm/drm_sysfs.h>
#include <drm/drm_vblank.h>

#include "vmwgfx_kms.h"

void vmw_du_cleanup(struct vmw_display_unit *du)
{
        struct vmw_private *dev_priv = vmw_priv(du->primary.dev);
        drm_plane_cleanup(&du->primary);
        if (vmw_cmd_supported(dev_priv))
                drm_plane_cleanup(&du->cursor);

        drm_connector_unregister(&du->connector);
        drm_crtc_cleanup(&du->crtc);
        drm_encoder_cleanup(&du->encoder);
        drm_connector_cleanup(&du->connector);
}

/*
 * Display Unit Cursor functions
 */

static 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_CMD_RESERVE(dev_priv, cmd_size);
        if (unlikely(cmd == NULL))
                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_cmd_commit_flush(dev_priv, cmd_size);

        return 0;
}

static int vmw_cursor_update_bo(struct vmw_private *dev_priv,
                                struct vmw_buffer_object *bo,
                                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 = PFN_UP(width*height*4);

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

        ret = ttm_bo_kmap(&bo->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(&bo->base);

        return ret;
}


static void vmw_cursor_update_position(struct vmw_private *dev_priv,
                                       bool show, int x, int y)
{
        uint32_t count;

        spin_lock(&dev_priv->cursor_lock);
        if (vmw_is_cursor_bypass3_enabled(dev_priv)) {
                vmw_fifo_mem_write(dev_priv, SVGA_FIFO_CURSOR_ON, show ? 1 : 0);
                vmw_fifo_mem_write(dev_priv, SVGA_FIFO_CURSOR_X, x);
                vmw_fifo_mem_write(dev_priv, SVGA_FIFO_CURSOR_Y, y);
                count = vmw_fifo_mem_read(dev_priv, SVGA_FIFO_CURSOR_COUNT);
                vmw_fifo_mem_write(dev_priv, SVGA_FIFO_CURSOR_COUNT, ++count);
        } else {
                vmw_write(dev_priv, SVGA_REG_CURSOR_X, x);
                vmw_write(dev_priv, SVGA_REG_CURSOR_Y, y);
                vmw_write(dev_priv, SVGA_REG_CURSOR_ON, show ? 1 : 0);
        }
        spin_unlock(&dev_priv->cursor_lock);
}


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("Can't 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, 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->drm;
        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->drm;
        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);
}


void vmw_du_cursor_plane_destroy(struct drm_plane *plane)
{
        vmw_cursor_update_position(plane->dev->dev_private, false, 0, 0);

        drm_plane_cleanup(plane);
}


void vmw_du_primary_plane_destroy(struct drm_plane *plane)
{
        drm_plane_cleanup(plane);

        /* Planes are static in our case so we don't free it */
}


/**
 * vmw_du_plane_unpin_surf - unpins resource associated with a framebuffer surface
 *
 * @vps: plane state associated with the display surface
 * @unreference: true if we also want to unreference the display.
 */
void vmw_du_plane_unpin_surf(struct vmw_plane_state *vps,
                             bool unreference)
{
        if (vps->surf) {
                if (vps->pinned) {
                        vmw_resource_unpin(&vps->surf->res);
                        vps->pinned--;
                }

                if (unreference) {
                        if (vps->pinned)
                                DRM_ERROR("Surface still pinned\n");
                        vmw_surface_unreference(&vps->surf);
                }
        }
}


/**
 * vmw_du_plane_cleanup_fb - Unpins the cursor
 *
 * @plane:  display plane
 * @old_state: Contains the FB to clean up
 *
 * Unpins the framebuffer surface
 *
 * Returns 0 on success
 */
void
vmw_du_plane_cleanup_fb(struct drm_plane *plane,
                        struct drm_plane_state *old_state)
{
        struct vmw_plane_state *vps = vmw_plane_state_to_vps(old_state);

        vmw_du_plane_unpin_surf(vps, false);
}


/**
 * vmw_du_cursor_plane_prepare_fb - Readies the cursor by referencing it
 *
 * @plane:  display plane
 * @new_state: info on the new plane state, including the FB
 *
 * Returns 0 on success
 */
int
vmw_du_cursor_plane_prepare_fb(struct drm_plane *plane,
                               struct drm_plane_state *new_state)
{
        struct drm_framebuffer *fb = new_state->fb;
        struct vmw_plane_state *vps = vmw_plane_state_to_vps(new_state);


        if (vps->surf)
                vmw_surface_unreference(&vps->surf);

        if (vps->bo)
                vmw_bo_unreference(&vps->bo);

        if (fb) {
                if (vmw_framebuffer_to_vfb(fb)->bo) {
                        vps->bo = vmw_framebuffer_to_vfbd(fb)->buffer;
                        vmw_bo_reference(vps->bo);
                } else {
                        vps->surf = vmw_framebuffer_to_vfbs(fb)->surface;
                        vmw_surface_reference(vps->surf);
                }
        }

        return 0;
}


void
vmw_du_cursor_plane_atomic_update(struct drm_plane *plane,
                                  struct drm_atomic_state *state)
{
        struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
                                                                           plane);
        struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
                                                                           plane);
        struct drm_crtc *crtc = new_state->crtc ?: old_state->crtc;
        struct vmw_private *dev_priv = vmw_priv(crtc->dev);
        struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
        struct vmw_plane_state *vps = vmw_plane_state_to_vps(new_state);
        s32 hotspot_x, hotspot_y;
        int ret = 0;


        hotspot_x = du->hotspot_x;
        hotspot_y = du->hotspot_y;

        if (new_state->fb) {
                hotspot_x += new_state->fb->hot_x;
                hotspot_y += new_state->fb->hot_y;
        }

        du->cursor_surface = vps->surf;
        du->cursor_bo = vps->bo;

        if (vps->surf) {
                du->cursor_age = du->cursor_surface->snooper.age;

                ret = vmw_cursor_update_image(dev_priv,
                                              vps->surf->snooper.image,
                                              64, 64, hotspot_x,
                                              hotspot_y);
        } else if (vps->bo) {
                ret = vmw_cursor_update_bo(dev_priv, vps->bo,
                                           new_state->crtc_w,
                                           new_state->crtc_h,
                                           hotspot_x, hotspot_y);
        } else {
                vmw_cursor_update_position(dev_priv, false, 0, 0);
                return;
        }

        if (!ret) {
                du->cursor_x = new_state->crtc_x + du->set_gui_x;
                du->cursor_y = new_state->crtc_y + du->set_gui_y;

                vmw_cursor_update_position(dev_priv, true,
                                           du->cursor_x + hotspot_x,
                                           du->cursor_y + hotspot_y);

                du->core_hotspot_x = hotspot_x - du->hotspot_x;
                du->core_hotspot_y = hotspot_y - du->hotspot_y;
        } else {
                DRM_ERROR("Failed to update cursor image\n");
        }
}


/**
 * vmw_du_primary_plane_atomic_check - check if the new state is okay
 *
 * @plane: display plane
 * @state: info on the new plane state, including the FB
 *
 * Check if the new state is settable given the current state.  Other
 * than what the atomic helper checks, we care about crtc fitting
 * the FB and maintaining one active framebuffer.
 *
 * Returns 0 on success
 */
int vmw_du_primary_plane_atomic_check(struct drm_plane *plane,
                                      struct drm_atomic_state *state)
{
        struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
                                                                           plane);
        struct drm_crtc_state *crtc_state = NULL;
        struct drm_framebuffer *new_fb = new_state->fb;
        int ret;

        if (new_state->crtc)
                crtc_state = drm_atomic_get_new_crtc_state(state,
                                                           new_state->crtc);

        ret = drm_atomic_helper_check_plane_state(new_state, crtc_state,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  false, true);

        if (!ret && new_fb) {
                struct drm_crtc *crtc = new_state->crtc;
                struct vmw_display_unit *du = vmw_crtc_to_du(crtc);

                vmw_connector_state_to_vcs(du->connector.state);
        }


        return ret;
}


/**
 * vmw_du_cursor_plane_atomic_check - check if the new state is okay
 *
 * @plane: cursor plane
 * @state: info on the new plane state
 *
 * This is a chance to fail if the new cursor state does not fit
 * our requirements.
 *
 * Returns 0 on success
 */
int vmw_du_cursor_plane_atomic_check(struct drm_plane *plane,
                                     struct drm_atomic_state *state)
{
        struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
                                                                           plane);
        int ret = 0;
        struct drm_crtc_state *crtc_state = NULL;
        struct vmw_surface *surface = NULL;
        struct drm_framebuffer *fb = new_state->fb;

        if (new_state->crtc)
                crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
                                                           new_state->crtc);

        ret = drm_atomic_helper_check_plane_state(new_state, crtc_state,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  true, true);
        if (ret)
                return ret;

        /* Turning off */
        if (!fb)
                return 0;

        /* A lot of the code assumes this */
        if (new_state->crtc_w != 64 || new_state->crtc_h != 64) {
                DRM_ERROR("Invalid cursor dimensions (%d, %d)\n",
                          new_state->crtc_w, new_state->crtc_h);
                ret = -EINVAL;
        }

        if (!vmw_framebuffer_to_vfb(fb)->bo)
                surface = vmw_framebuffer_to_vfbs(fb)->surface;

        if (surface && !surface->snooper.image) {
                DRM_ERROR("surface not suitable for cursor\n");
                ret = -EINVAL;
        }

        return ret;
}


int vmw_du_crtc_atomic_check(struct drm_crtc *crtc,
                             struct drm_atomic_state *state)
{
        struct drm_crtc_state *new_state = drm_atomic_get_new_crtc_state(state,
                                                                         crtc);
        struct vmw_display_unit *du = vmw_crtc_to_du(new_state->crtc);
        int connector_mask = drm_connector_mask(&du->connector);
        bool has_primary = new_state->plane_mask &
                           drm_plane_mask(crtc->primary);

        /* We always want to have an active plane with an active CRTC */
        if (has_primary != new_state->enable)
                return -EINVAL;


        if (new_state->connector_mask != connector_mask &&
            new_state->connector_mask != 0) {
                DRM_ERROR("Invalid connectors configuration\n");
                return -EINVAL;
        }

        /*
         * Our virtual device does not have a dot clock, so use the logical
         * clock value as the dot clock.
         */
        if (new_state->mode.crtc_clock == 0)
                new_state->adjusted_mode.crtc_clock = new_state->mode.clock;

        return 0;
}


void vmw_du_crtc_atomic_begin(struct drm_crtc *crtc,
                              struct drm_atomic_state *state)
{
}


void vmw_du_crtc_atomic_flush(struct drm_crtc *crtc,
                              struct drm_atomic_state *state)
{
        struct drm_pending_vblank_event *event = crtc->state->event;

        if (event) {
                crtc->state->event = NULL;

                spin_lock_irq(&crtc->dev->event_lock);
                drm_crtc_send_vblank_event(crtc, event);
                spin_unlock_irq(&crtc->dev->event_lock);
        }
}


/**
 * vmw_du_crtc_duplicate_state - duplicate crtc state
 * @crtc: DRM crtc
 *
 * Allocates and returns a copy of the crtc state (both common and
 * vmw-specific) for the specified crtc.
 *
 * Returns: The newly allocated crtc state, or NULL on failure.
 */
struct drm_crtc_state *
vmw_du_crtc_duplicate_state(struct drm_crtc *crtc)
{
        struct drm_crtc_state *state;
        struct vmw_crtc_state *vcs;

        if (WARN_ON(!crtc->state))
                return NULL;

        vcs = kmemdup(crtc->state, sizeof(*vcs), GFP_KERNEL);

        if (!vcs)
                return NULL;

        state = &vcs->base;

        __drm_atomic_helper_crtc_duplicate_state(crtc, state);

        return state;
}


/**
 * vmw_du_crtc_reset - creates a blank vmw crtc state
 * @crtc: DRM crtc
 *
 * Resets the atomic state for @crtc by freeing the state pointer (which
 * might be NULL, e.g. at driver load time) and allocating a new empty state
 * object.
 */
void vmw_du_crtc_reset(struct drm_crtc *crtc)
{
        struct vmw_crtc_state *vcs;


        if (crtc->state) {
                __drm_atomic_helper_crtc_destroy_state(crtc->state);

                kfree(vmw_crtc_state_to_vcs(crtc->state));
        }

        vcs = kzalloc(sizeof(*vcs), GFP_KERNEL);

        if (!vcs) {
                DRM_ERROR("Cannot allocate vmw_crtc_state\n");
                return;
        }

        __drm_atomic_helper_crtc_reset(crtc, &vcs->base);
}


/**
 * vmw_du_crtc_destroy_state - destroy crtc state
 * @crtc: DRM crtc
 * @state: state object to destroy
 *
 * Destroys the crtc state (both common and vmw-specific) for the
 * specified plane.
 */
void
vmw_du_crtc_destroy_state(struct drm_crtc *crtc,
                          struct drm_crtc_state *state)
{
        drm_atomic_helper_crtc_destroy_state(crtc, state);
}


/**
 * vmw_du_plane_duplicate_state - duplicate plane state
 * @plane: drm plane
 *
 * Allocates and returns a copy of the plane state (both common and
 * vmw-specific) for the specified plane.
 *
 * Returns: The newly allocated plane state, or NULL on failure.
 */
struct drm_plane_state *
vmw_du_plane_duplicate_state(struct drm_plane *plane)
{
        struct drm_plane_state *state;
        struct vmw_plane_state *vps;

        vps = kmemdup(plane->state, sizeof(*vps), GFP_KERNEL);

        if (!vps)
                return NULL;

        vps->pinned = 0;
        vps->cpp = 0;

        /* Each ref counted resource needs to be acquired again */
        if (vps->surf)
                (void) vmw_surface_reference(vps->surf);

        if (vps->bo)
                (void) vmw_bo_reference(vps->bo);

        state = &vps->base;

        __drm_atomic_helper_plane_duplicate_state(plane, state);

        return state;
}


/**
 * vmw_du_plane_reset - creates a blank vmw plane state
 * @plane: drm plane
 *
 * Resets the atomic state for @plane by freeing the state pointer (which might
 * be NULL, e.g. at driver load time) and allocating a new empty state object.
 */
void vmw_du_plane_reset(struct drm_plane *plane)
{
        struct vmw_plane_state *vps;


        if (plane->state)
                vmw_du_plane_destroy_state(plane, plane->state);

        vps = kzalloc(sizeof(*vps), GFP_KERNEL);

        if (!vps) {
                DRM_ERROR("Cannot allocate vmw_plane_state\n");
                return;
        }

        __drm_atomic_helper_plane_reset(plane, &vps->base);
}


/**
 * vmw_du_plane_destroy_state - destroy plane state
 * @plane: DRM plane
 * @state: state object to destroy
 *
 * Destroys the plane state (both common and vmw-specific) for the
 * specified plane.
 */
void
vmw_du_plane_destroy_state(struct drm_plane *plane,
                           struct drm_plane_state *state)
{
        struct vmw_plane_state *vps = vmw_plane_state_to_vps(state);


        /* Should have been freed by cleanup_fb */
        if (vps->surf)
                vmw_surface_unreference(&vps->surf);

        if (vps->bo)
                vmw_bo_unreference(&vps->bo);

        drm_atomic_helper_plane_destroy_state(plane, state);
}


/**
 * vmw_du_connector_duplicate_state - duplicate connector state
 * @connector: DRM connector
 *
 * Allocates and returns a copy of the connector state (both common and
 * vmw-specific) for the specified connector.
 *
 * Returns: The newly allocated connector state, or NULL on failure.
 */
struct drm_connector_state *
vmw_du_connector_duplicate_state(struct drm_connector *connector)
{
        struct drm_connector_state *state;
        struct vmw_connector_state *vcs;

        if (WARN_ON(!connector->state))
                return NULL;

        vcs = kmemdup(connector->state, sizeof(*vcs), GFP_KERNEL);

        if (!vcs)
                return NULL;

        state = &vcs->base;

        __drm_atomic_helper_connector_duplicate_state(connector, state);

        return state;
}


/**
 * vmw_du_connector_reset - creates a blank vmw connector state
 * @connector: DRM connector
 *
 * Resets the atomic state for @connector by freeing the state pointer (which
 * might be NULL, e.g. at driver load time) and allocating a new empty state
 * object.
 */
void vmw_du_connector_reset(struct drm_connector *connector)
{
        struct vmw_connector_state *vcs;


        if (connector->state) {
                __drm_atomic_helper_connector_destroy_state(connector->state);

                kfree(vmw_connector_state_to_vcs(connector->state));
        }

        vcs = kzalloc(sizeof(*vcs), GFP_KERNEL);

        if (!vcs) {
                DRM_ERROR("Cannot allocate vmw_connector_state\n");
                return;
        }

        __drm_atomic_helper_connector_reset(connector, &vcs->base);
}


/**
 * vmw_du_connector_destroy_state - destroy connector state
 * @connector: DRM connector
 * @state: state object to destroy
 *
 * Destroys the connector state (both common and vmw-specific) for the
 * specified plane.
 */
void
vmw_du_connector_destroy_state(struct drm_connector *connector,
                          struct drm_connector_state *state)
{
        drm_atomic_helper_connector_destroy_state(connector, state);
}
/*
 * 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);

        kfree(vfbs);
}

/**
 * vmw_kms_readback - Perform a readback from the screen system to
 * a buffer-object 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 buffer-object 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,
                                            NULL);
        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, NULL);
        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 = drm_atomic_helper_dirtyfb,
};

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_cmd2
                                           *mode_cmd,
                                           bool is_bo_proxy)

{
        struct drm_device *dev = &dev_priv->drm;
        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->metadata.scanout))
                return -EINVAL;

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

        switch (mode_cmd->pixel_format) {
        case DRM_FORMAT_ARGB8888:
                format = SVGA3D_A8R8G8B8;
                break;
        case DRM_FORMAT_XRGB8888:
                format = SVGA3D_X8R8G8B8;
                break;
        case DRM_FORMAT_RGB565:
                format = SVGA3D_R5G6B5;
                break;
        case DRM_FORMAT_XRGB1555:
                format = SVGA3D_A1R5G5B5;
                break;
        default:
                DRM_ERROR("Invalid pixel format: %p4cc\n",
                          &mode_cmd->pixel_format);
                return -EINVAL;
        }

        /*
         * For DX, surface format validation is done when surface->scanout
         * is set.
         */
        if (!has_sm4_context(dev_priv) && format != surface->metadata.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;
        }

        drm_helper_mode_fill_fb_struct(dev, &vfbs->base.base, mode_cmd);
        vfbs->surface = vmw_surface_reference(surface);
        vfbs->base.user_handle = mode_cmd->handles[0];
        vfbs->is_bo_proxy = is_bo_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;
}

/*
 * Buffer-object framebuffer code
 */

static int vmw_framebuffer_bo_create_handle(struct drm_framebuffer *fb,
                                            struct drm_file *file_priv,
                                            unsigned int *handle)
{
        struct vmw_framebuffer_bo *vfbd =
                        vmw_framebuffer_to_vfbd(fb);

        return drm_gem_handle_create(file_priv, &vfbd->buffer->base.base, handle);
}

static void vmw_framebuffer_bo_destroy(struct drm_framebuffer *framebuffer)

{
        struct vmw_framebuffer_bo *vfbd =
                vmw_framebuffer_to_vfbd(framebuffer);

        drm_framebuffer_cleanup(framebuffer);
        vmw_bo_unreference(&vfbd->buffer);

        kfree(vfbd);
}

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

        drm_modeset_lock_all(&dev_priv->drm);

        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_legacy:
                ret = vmw_kms_ldu_do_bo_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_cmd_flush(dev_priv, false);

        drm_modeset_unlock_all(&dev_priv->drm);

        return ret;
}

static int vmw_framebuffer_bo_dirty_ext(struct drm_framebuffer *framebuffer,
                                        struct drm_file *file_priv,
                                        unsigned int flags, unsigned int color,
                                        struct drm_clip_rect *clips,
                                        unsigned int num_clips)
{
        struct vmw_private *dev_priv = vmw_priv(framebuffer->dev);

        if (dev_priv->active_display_unit == vmw_du_legacy &&
            vmw_cmd_supported(dev_priv))
                return vmw_framebuffer_bo_dirty(framebuffer, file_priv, flags,
                                                color, clips, num_clips);

        return drm_atomic_helper_dirtyfb(framebuffer, file_priv, flags, color,
                                         clips, num_clips);
}

static const struct drm_framebuffer_funcs vmw_framebuffer_bo_funcs = {
        .create_handle = vmw_framebuffer_bo_create_handle,
        .destroy = vmw_framebuffer_bo_destroy,
        .dirty = vmw_framebuffer_bo_dirty_ext,
};

/*
 * Pin the bofer in a location suitable for access by the
 * display system.
 */
static int vmw_framebuffer_pin(struct vmw_framebuffer *vfb)
{
        struct vmw_private *dev_priv = vmw_priv(vfb->base.dev);
        struct vmw_buffer_object *buf;
        struct ttm_placement *placement;
        int ret;

        buf = vfb->bo ?  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_bo_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->bo) {
                        if (dev_priv->capabilities & SVGA_CAP_3D) {
                                /*
                                 * Use surface DMA to get content to
                                 * sreen target surface.
                                 */
                                placement = &vmw_vram_gmr_placement;
                        } else {
                                /* Use CPU blit. */
                                placement = &vmw_sys_placement;
                        }
                } else {
                        /* Use surface / image update */
                        placement = &vmw_mob_placement;
                }

                return vmw_bo_pin_in_placement(dev_priv, buf, 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_buffer_object *buf;

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

        if (WARN_ON(!buf))
                return 0;

        return vmw_bo_unpin(dev_priv, buf, false);
}

/**
 * vmw_create_bo_proxy - create a proxy surface for the buffer object
 *
 * @dev: DRM device
 * @mode_cmd: parameters for the new surface
 * @bo_mob: MOB backing the buffer object
 * @srf_out: newly created surface
 *
 * When the content FB is a buffer object, 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_bo_proxy(struct drm_device *dev,
                               const struct drm_mode_fb_cmd2 *mode_cmd,
                               struct vmw_buffer_object *bo_mob,
                               struct vmw_surface **srf_out)
{
        struct vmw_surface_metadata metadata = {0};
        uint32_t format;
        struct vmw_resource *res;
        unsigned int bytes_pp;
        int ret;

        switch (mode_cmd->pixel_format) {
        case DRM_FORMAT_ARGB8888:
        case DRM_FORMAT_XRGB8888:
                format = SVGA3D_X8R8G8B8;
                bytes_pp = 4;
                break;

        case DRM_FORMAT_RGB565:
        case DRM_FORMAT_XRGB1555:
                format = SVGA3D_R5G6B5;
                bytes_pp = 2;
                break;

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

        default:
                DRM_ERROR("Invalid framebuffer format %p4cc\n",
                          &mode_cmd->pixel_format);
                return -EINVAL;
        }

        metadata.format = format;
        metadata.mip_levels[0] = 1;
        metadata.num_sizes = 1;
        metadata.base_size.width = mode_cmd->pitches[0] / bytes_pp;
        metadata.base_size.height =  mode_cmd->height;
        metadata.base_size.depth = 1;
        metadata.scanout = true;

        ret = vmw_gb_surface_define(vmw_priv(dev), &metadata, 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_bo_unreference(&res->backup);
        res->backup = vmw_bo_reference(bo_mob);
        res->backup_offset = 0;
        vmw_resource_unreserve(res, false, false, false, NULL, 0);
        mutex_unlock(&res->dev_priv->cmdbuf_mutex);

        return 0;
}



static int vmw_kms_new_framebuffer_bo(struct vmw_private *dev_priv,
                                      struct vmw_buffer_object *bo,
                                      struct vmw_framebuffer **out,
                                      const struct drm_mode_fb_cmd2
                                      *mode_cmd)

{
        struct drm_device *dev = &dev_priv->drm;
        struct vmw_framebuffer_bo *vfbd;
        unsigned int requested_size;
        int ret;

        requested_size = mode_cmd->height * mode_cmd->pitches[0];
        if (unlikely(requested_size > bo->base.base.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->pixel_format) {
                case DRM_FORMAT_XRGB8888:
                case DRM_FORMAT_ARGB8888:
                        break;
                case DRM_FORMAT_XRGB1555:
                case DRM_FORMAT_RGB565:
                        break;
                default:
                        DRM_ERROR("Invalid pixel format: %p4cc\n",
                                  &mode_cmd->pixel_format);
                        return -EINVAL;
                }
        }

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

        vfbd->base.base.obj[0] = &bo->base.base;
        drm_helper_mode_fill_fb_struct(dev, &vfbd->base.base, mode_cmd);
        vfbd->base.bo = true;
        vfbd->buffer = vmw_bo_reference(bo);
        vfbd->base.user_handle = mode_cmd->handles[0];
        *out = &vfbd->base;

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

        return 0;

out_err2:
        vmw_bo_unreference(&bo);
        kfree(vfbd);
out_err1:
        return ret;
}


/**
 * vmw_kms_srf_ok - check if a surface can be created
 *
 * @dev_priv: Pointer to device private struct.
 * @width: requested width
 * @height: requested height
 *
 * Surfaces need to be less than texture size
 */
static bool
vmw_kms_srf_ok(struct vmw_private *dev_priv, uint32_t width, uint32_t height)
{
        if (width  > dev_priv->texture_max_width ||
            height > dev_priv->texture_max_height)
                return false;

        return true;
}

/**
 * vmw_kms_new_framebuffer - Create a new framebuffer.
 *
 * @dev_priv: Pointer to device private struct.
 * @bo: Pointer to buffer object to wrap the kms framebuffer around.
 * Either @bo or @surface must be NULL.
 * @surface: Pointer to a surface to wrap the kms framebuffer around.
 * Either @bo or @surface must be NULL.
 * @only_2d: No presents will occur to this buffer object 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_buffer_object *bo,
                        struct vmw_surface *surface,
                        bool only_2d,
                        const struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct vmw_framebuffer *vfb = NULL;
        bool is_bo_proxy = false;
        int ret;

        /*
         * We cannot use the SurfaceDMA command in an non-accelerated VM,
         * therefore, wrap the buffer object in a surface so we can use the
         * SurfaceCopy command.
         */
        if (vmw_kms_srf_ok(dev_priv, mode_cmd->width, mode_cmd->height)  &&
            bo && only_2d &&
            mode_cmd->width > 64 &&  /* Don't create a proxy for cursor */
            dev_priv->active_display_unit == vmw_du_screen_target) {
                ret = vmw_create_bo_proxy(&dev_priv->drm, mode_cmd,
                                          bo, &surface);
                if (ret)
                        return ERR_PTR(ret);

                is_bo_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_bo_proxy);
                /*
                 * vmw_create_bo_proxy() adds a reference that is no longer
                 * needed
                 */
                if (is_bo_proxy)
                        vmw_surface_unreference(&surface);
        } else if (bo) {
                ret = vmw_kms_new_framebuffer_bo(dev_priv, bo, &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_cmd)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct vmw_framebuffer *vfb = NULL;
        struct vmw_surface *surface = NULL;
        struct vmw_buffer_object *bo = NULL;
        int ret;

        /* returns either a bo or surface */
        ret = vmw_user_lookup_handle(dev_priv, file_priv,
                                     mode_cmd->handles[0],
                                     &surface, &bo);
        if (ret) {
                DRM_ERROR("Invalid buffer object handle %u (0x%x).\n",
                          mode_cmd->handles[0], mode_cmd->handles[0]);
                goto err_out;
        }


        if (!bo &&
            !vmw_kms_srf_ok(dev_priv, mode_cmd->width, mode_cmd->height)) {
                DRM_ERROR("Surface size cannot exceed %dx%d\n",
                        dev_priv->texture_max_width,
                        dev_priv->texture_max_height);
                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_bo_unreference(&bo);
        if (surface)
                vmw_surface_unreference(&surface);

        if (ret) {
                DRM_ERROR("failed to create vmw_framebuffer: %i\n", ret);
                return ERR_PTR(ret);
        }

        return &vfb->base;
}

/**
 * vmw_kms_check_display_memory - Validates display memory required for a
 * topology
 * @dev: DRM device
 * @num_rects: number of drm_rect in rects
 * @rects: array of drm_rect representing the topology to validate indexed by
 * crtc index.
 *
 * Returns:
 * 0 on success otherwise negative error code
 */
static int vmw_kms_check_display_memory(struct drm_device *dev,
                                        uint32_t num_rects,
                                        struct drm_rect *rects)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct drm_rect bounding_box = {0};
        u64 total_pixels = 0, pixel_mem, bb_mem;
        int i;

        for (i = 0; i < num_rects; i++) {
                /*
                 * For STDU only individual screen (screen target) is limited by
                 * SCREENTARGET_MAX_WIDTH/HEIGHT registers.
                 */
                if (dev_priv->active_display_unit == vmw_du_screen_target &&
                    (drm_rect_width(&rects[i]) > dev_priv->stdu_max_width ||
                     drm_rect_height(&rects[i]) > dev_priv->stdu_max_height)) {
                        VMW_DEBUG_KMS("Screen size not supported.\n");
                        return -EINVAL;
                }

                /* Bounding box upper left is at (0,0). */
                if (rects[i].x2 > bounding_box.x2)
                        bounding_box.x2 = rects[i].x2;

                if (rects[i].y2 > bounding_box.y2)
                        bounding_box.y2 = rects[i].y2;

                total_pixels += (u64) drm_rect_width(&rects[i]) *
                        (u64) drm_rect_height(&rects[i]);
        }

        /* Virtual svga device primary limits are always in 32-bpp. */
        pixel_mem = total_pixels * 4;

        /*
         * For HV10 and below prim_bb_mem is vram size. When
         * SVGA_REG_MAX_PRIMARY_BOUNDING_BOX_MEM is not present vram size is
         * limit on primary bounding box
         */
        if (pixel_mem > dev_priv->max_primary_mem) {
                VMW_DEBUG_KMS("Combined output size too large.\n");
                return -EINVAL;
        }

        /* SVGA_CAP_NO_BB_RESTRICTION is available for STDU only. */
        if (dev_priv->active_display_unit != vmw_du_screen_target ||
            !(dev_priv->capabilities & SVGA_CAP_NO_BB_RESTRICTION)) {
                bb_mem = (u64) bounding_box.x2 * bounding_box.y2 * 4;

                if (bb_mem > dev_priv->max_primary_mem) {
                        VMW_DEBUG_KMS("Topology is beyond supported limits.\n");
                        return -EINVAL;
                }
        }

        return 0;
}

/**
 * vmw_crtc_state_and_lock - Return new or current crtc state with locked
 * crtc mutex
 * @state: The atomic state pointer containing the new atomic state
 * @crtc: The crtc
 *
 * This function returns the new crtc state if it's part of the state update.
 * Otherwise returns the current crtc state. It also makes sure that the
 * crtc mutex is locked.
 *
 * Returns: A valid crtc state pointer or NULL. It may also return a
 * pointer error, in particular -EDEADLK if locking needs to be rerun.
 */
static struct drm_crtc_state *
vmw_crtc_state_and_lock(struct drm_atomic_state *state, struct drm_crtc *crtc)
{
        struct drm_crtc_state *crtc_state;

        crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
        if (crtc_state) {
                lockdep_assert_held(&crtc->mutex.mutex.base);
        } else {
                int ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);

                if (ret != 0 && ret != -EALREADY)
                        return ERR_PTR(ret);

                crtc_state = crtc->state;
        }

        return crtc_state;
}

/**
 * vmw_kms_check_implicit - Verify that all implicit display units scan out
 * from the same fb after the new state is committed.
 * @dev: The drm_device.
 * @state: The new state to be checked.
 *
 * Returns:
 *   Zero on success,
 *   -EINVAL on invalid state,
 *   -EDEADLK if modeset locking needs to be rerun.
 */
static int vmw_kms_check_implicit(struct drm_device *dev,
                                  struct drm_atomic_state *state)
{
        struct drm_framebuffer *implicit_fb = NULL;
        struct drm_crtc *crtc;
        struct drm_crtc_state *crtc_state;
        struct drm_plane_state *plane_state;

        drm_for_each_crtc(crtc, dev) {
                struct vmw_display_unit *du = vmw_crtc_to_du(crtc);

                if (!du->is_implicit)
                        continue;

                crtc_state = vmw_crtc_state_and_lock(state, crtc);
                if (IS_ERR(crtc_state))
                        return PTR_ERR(crtc_state);

                if (!crtc_state || !crtc_state->enable)
                        continue;

                /*
                 * Can't move primary planes across crtcs, so this is OK.
                 * It also means we don't need to take the plane mutex.
                 */
                plane_state = du->primary.state;
                if (plane_state->crtc != crtc)
                        continue;

                if (!implicit_fb)
                        implicit_fb = plane_state->fb;
                else if (implicit_fb != plane_state->fb)
                        return -EINVAL;
        }

        return 0;
}

/**
 * vmw_kms_check_topology - Validates topology in drm_atomic_state
 * @dev: DRM device
 * @state: the driver state object
 *
 * Returns:
 * 0 on success otherwise negative error code
 */
static int vmw_kms_check_topology(struct drm_device *dev,
                                  struct drm_atomic_state *state)
{
        struct drm_crtc_state *old_crtc_state, *new_crtc_state;
        struct drm_rect *rects;
        struct drm_crtc *crtc;
        uint32_t i;
        int ret = 0;

        rects = kcalloc(dev->mode_config.num_crtc, sizeof(struct drm_rect),
                        GFP_KERNEL);
        if (!rects)
                return -ENOMEM;

        drm_for_each_crtc(crtc, dev) {
                struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
                struct drm_crtc_state *crtc_state;

                i = drm_crtc_index(crtc);

                crtc_state = vmw_crtc_state_and_lock(state, crtc);
                if (IS_ERR(crtc_state)) {
                        ret = PTR_ERR(crtc_state);
                        goto clean;
                }

                if (!crtc_state)
                        continue;

                if (crtc_state->enable) {
                        rects[i].x1 = du->gui_x;
                        rects[i].y1 = du->gui_y;
                        rects[i].x2 = du->gui_x + crtc_state->mode.hdisplay;
                        rects[i].y2 = du->gui_y + crtc_state->mode.vdisplay;
                } else {
                        rects[i].x1 = 0;
                        rects[i].y1 = 0;
                        rects[i].x2 = 0;
                        rects[i].y2 = 0;
                }
        }

        /* Determine change to topology due to new atomic state */
        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
                                      new_crtc_state, i) {
                struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
                struct drm_connector *connector;
                struct drm_connector_state *conn_state;
                struct vmw_connector_state *vmw_conn_state;

                if (!du->pref_active && new_crtc_state->enable) {
                        VMW_DEBUG_KMS("Enabling a disabled display unit\n");
                        ret = -EINVAL;
                        goto clean;
                }

                /*
                 * For vmwgfx each crtc has only one connector attached and it
                 * is not changed so don't really need to check the
                 * crtc->connector_mask and iterate over it.
                 */
                connector = &du->connector;
                conn_state = drm_atomic_get_connector_state(state, connector);
                if (IS_ERR(conn_state)) {
                        ret = PTR_ERR(conn_state);
                        goto clean;
                }

                vmw_conn_state = vmw_connector_state_to_vcs(conn_state);
                vmw_conn_state->gui_x = du->gui_x;
                vmw_conn_state->gui_y = du->gui_y;
        }

        ret = vmw_kms_check_display_memory(dev, dev->mode_config.num_crtc,
                                           rects);

clean:
        kfree(rects);
        return ret;
}

/**
 * vmw_kms_atomic_check_modeset- validate state object for modeset changes
 *
 * @dev: DRM device
 * @state: the driver state object
 *
 * This is a simple wrapper around drm_atomic_helper_check_modeset() for
 * us to assign a value to mode->crtc_clock so that
 * drm_calc_timestamping_constants() won't throw an error message
 *
 * Returns:
 * Zero for success or -errno
 */
static int
vmw_kms_atomic_check_modeset(struct drm_device *dev,
                             struct drm_atomic_state *state)
{
        struct drm_crtc *crtc;
        struct drm_crtc_state *crtc_state;
        bool need_modeset = false;
        int i, ret;

        ret = drm_atomic_helper_check(dev, state);
        if (ret)
                return ret;

        ret = vmw_kms_check_implicit(dev, state);
        if (ret) {
                VMW_DEBUG_KMS("Invalid implicit state\n");
                return ret;
        }

        for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
                if (drm_atomic_crtc_needs_modeset(crtc_state))
                        need_modeset = true;
        }

        if (need_modeset)
                return vmw_kms_check_topology(dev, state);

        return ret;
}

static const struct drm_mode_config_funcs vmw_kms_funcs = {
        .fb_create = vmw_kms_fb_create,
        .atomic_check = vmw_kms_atomic_check_modeset,
        .atomic_commit = drm_atomic_helper_commit,
};

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, 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, 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_cmd_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->drm,
                                          DRM_MODE_PROP_IMMUTABLE,
                                          "hotplug_mode_update", 0, 1);
}

int vmw_kms_init(struct vmw_private *dev_priv)
{
        struct drm_device *dev = &dev_priv->drm;
        int ret;
        static const char *display_unit_names[] = {
                "Invalid",
                "Legacy",
                "Screen Object",
                "Screen Target",
                "Invalid (max)"
        };

        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);
        }
        BUILD_BUG_ON(ARRAY_SIZE(display_unit_names) != (vmw_du_max + 1));
        drm_info(&dev_priv->drm, "%s display unit initialized\n",
                 display_unit_names[dev_priv->active_display_unit]);

        return ret;
}

int vmw_kms_close(struct vmw_private *dev_priv)
{
        int ret = 0;

        /*
         * 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->drm);
        if (dev_priv->active_display_unit == vmw_du_legacy)
                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, file_priv, 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_fifo_mem_write(vmw_priv, SVGA_FIFO_PITCHLOCK, pitch);
        vmw_write(vmw_priv, SVGA_REG_WIDTH, width);
        vmw_write(vmw_priv, SVGA_REG_HEIGHT, height);
        if ((vmw_priv->capabilities & SVGA_CAP_8BIT_EMULATION) != 0)
                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;
}

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->max_primary_mem : dev_priv->vram_size);
}


/*
 * Function called by DRM code called with vbl_lock held.
 */
u32 vmw_get_vblank_counter(struct drm_crtc *crtc)
{
        return 0;
}

/*
 * Function called by DRM code called with vbl_lock held.
 */
int vmw_enable_vblank(struct drm_crtc *crtc)
{
        return -EINVAL;
}

/*
 * Function called by DRM code called with vbl_lock held.
 */
void vmw_disable_vblank(struct drm_crtc *crtc)
{
}

/**
 * vmw_du_update_layout - Update the display unit with topology from resolution
 * plugin and generate DRM uevent
 * @dev_priv: device private
 * @num_rects: number of drm_rect in rects
 * @rects: toplogy to update
 */
static int vmw_du_update_layout(struct vmw_private *dev_priv,
                                unsigned int num_rects, struct drm_rect *rects)
{
        struct drm_device *dev = &dev_priv->drm;
        struct vmw_display_unit *du;
        struct drm_connector *con;
        struct drm_connector_list_iter conn_iter;
        struct drm_modeset_acquire_ctx ctx;
        struct drm_crtc *crtc;
        int ret;

        /* Currently gui_x/y is protected with the crtc mutex */
        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_acquire_init(&ctx, 0);
retry:
        drm_for_each_crtc(crtc, dev) {
                ret = drm_modeset_lock(&crtc->mutex, &ctx);
                if (ret < 0) {
                        if (ret == -EDEADLK) {
                                drm_modeset_backoff(&ctx);
                                goto retry;
                }
                        goto out_fini;
                }
        }

        drm_connector_list_iter_begin(dev, &conn_iter);
        drm_for_each_connector_iter(con, &conn_iter) {
                du = vmw_connector_to_du(con);
                if (num_rects > du->unit) {
                        du->pref_width = drm_rect_width(&rects[du->unit]);
                        du->pref_height = drm_rect_height(&rects[du->unit]);
                        du->pref_active = true;
                        du->gui_x = rects[du->unit].x1;
                        du->gui_y = rects[du->unit].y1;
                } else {
                        du->pref_width = 800;
                        du->pref_height = 600;
                        du->pref_active = false;
                        du->gui_x = 0;
                        du->gui_y = 0;
                }
        }
        drm_connector_list_iter_end(&conn_iter);

        list_for_each_entry(con, &dev->mode_config.connector_list, head) {
                du = vmw_connector_to_du(con);
                if (num_rects > du->unit) {
                        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 {
                        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);
        }

        drm_sysfs_hotplug_event(dev);
out_fini:
        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);
        mutex_unlock(&dev->mode_config.mutex);

 
        return 0;
}

int vmw_du_crtc_gamma_set(struct drm_crtc *crtc,
                          u16 *r, u16 *g, u16 *b,
                          uint32_t size,
                          struct drm_modeset_acquire_ctx *ctx)
{
        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);
        }

        return 0;
}

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) },
        /* 1280x720@60Hz */
        { DRM_MODE("1280x720", DRM_MODE_TYPE_DRIVER, 74500, 1280, 1344,
                   1472, 1664, 0, 720, 723, 728, 748, 0,
                   DRM_MODE_FLAG_NHSYNC | 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) },
        /* 1920x1080@60Hz */
        { DRM_MODE("1920x1080", DRM_MODE_TYPE_DRIVER, 173000, 1920, 2048,
                   2248, 2576, 0, 1080, 1083, 1088, 1120, 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) },
        /* 2560x1440@60Hz */
        { DRM_MODE("2560x1440", DRM_MODE_TYPE_DRIVER, 241500, 2560, 2608,
                   2640, 2720, 0, 1440, 1443, 1448, 1481, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
        /* 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) },
        /* 2880x1800@60Hz */
        { DRM_MODE("2880x1800", DRM_MODE_TYPE_DRIVER, 337500, 2880, 2928,
                   2960, 3040, 0, 1800, 1803, 1809, 1852, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
        /* 3840x2160@60Hz */
        { DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 533000, 3840, 3888,
                   3920, 4000, 0, 2160, 2163, 2168, 2222, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
        /* 3840x2400@60Hz */
        { DRM_MODE("3840x2400", DRM_MODE_TYPE_DRIVER, 592250, 3840, 3888,
                   3920, 4000, 0, 2400, 2403, 2409, 2469, 0,
                   DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC) },
        /* 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;
}


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 = 4;

        if (dev_priv->assume_16bpp)
                assumed_bpp = 2;

        max_width  = min(max_width,  dev_priv->texture_max_width);
        max_height = min(max_height, dev_priv->texture_max_height);

        /*
         * For STDU extra limit for a mode on SVGA_REG_SCREENTARGET_MAX_WIDTH/
         * HEIGHT registers.
         */
        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);
        drm_mode_set_name(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;

                drm_mode_probed_add(connector, mode);
        }

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

        return 1;
}

/**
 * vmw_kms_update_layout_ioctl - Handler for DRM_VMW_UPDATE_LAYOUT ioctl
 * @dev: drm device for the ioctl
 * @data: data pointer for the ioctl
 * @file_priv: drm file for the ioctl call
 *
 * Update preferred topology of display unit as per ioctl request. The topology
 * is expressed as array of drm_vmw_rect.
 * e.g.
 * [0 0 640 480] [640 0 800 600] [0 480 640 480]
 *
 * NOTE:
 * The x and y offset (upper left) in drm_vmw_rect cannot be less than 0. Beside
 * device limit on topology, x + w and y + h (lower right) cannot be greater
 * than INT_MAX. So topology beyond these limits will return with error.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
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_mode_config *mode_config = &dev->mode_config;
        struct drm_vmw_update_layout_arg *arg =
                (struct drm_vmw_update_layout_arg *)data;
        void __user *user_rects;
        struct drm_vmw_rect *rects;
        struct drm_rect *drm_rects;
        unsigned rects_size;
        int ret, i;

        if (!arg->num_outputs) {
                struct drm_rect def_rect = {0, 0, 800, 600};
                VMW_DEBUG_KMS("Default layout x1 = %d y1 = %d x2 = %d y2 = %d\n",
                              def_rect.x1, def_rect.y1,
                              def_rect.x2, def_rect.y2);
                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;
        }

        drm_rects = (struct drm_rect *)rects;

        VMW_DEBUG_KMS("Layout count = %u\n", arg->num_outputs);
        for (i = 0; i < arg->num_outputs; i++) {
                struct drm_vmw_rect curr_rect;

                /* Verify user-space for overflow as kernel use drm_rect */
                if ((rects[i].x + rects[i].w > INT_MAX) ||
                    (rects[i].y + rects[i].h > INT_MAX)) {
                        ret = -ERANGE;
                        goto out_free;
                }

                curr_rect = rects[i];
                drm_rects[i].x1 = curr_rect.x;
                drm_rects[i].y1 = curr_rect.y;
                drm_rects[i].x2 = curr_rect.x + curr_rect.w;
                drm_rects[i].y2 = curr_rect.y + curr_rect.h;

                VMW_DEBUG_KMS("  x1 = %d y1 = %d x2 = %d y2 = %d\n",
                              drm_rects[i].x1, drm_rects[i].y1,
                              drm_rects[i].x2, drm_rects[i].y2);

                /*
                 * Currently this check is limiting the topology within
                 * mode_config->max (which actually is max texture size
                 * supported by virtual device). This limit is here to address
                 * window managers that create a big framebuffer for whole
                 * topology.
                 */
                if (drm_rects[i].x1 < 0 ||  drm_rects[i].y1 < 0 ||
                    drm_rects[i].x2 > mode_config->max_width ||
                    drm_rects[i].y2 > mode_config->max_height) {
                        VMW_DEBUG_KMS("Invalid layout %d %d %d %d\n",
                                      drm_rects[i].x1, drm_rects[i].y1,
                                      drm_rects[i].x2, drm_rects[i].y2);
                        ret = -EINVAL;
                        goto out_free;
                }
        }

        ret = vmw_kms_check_display_memory(dev, arg->num_outputs, drm_rects);

        if (ret == 0)
                vmw_du_update_layout(dev_priv, arg->num_outputs, drm_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;

        /* If crtc is passed, no need to iterate over other display units */
        if (dirty->crtc) {
                units[num_units++] = vmw_crtc_to_du(dirty->crtc);
        } else {
                list_for_each_entry(crtc, &dev_priv->drm.mode_config.crtc_list,
                                    head) {
                        struct drm_plane *plane = crtc->primary;

                        if (plane->state->fb == &framebuffer->base)
                                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_CMD_RESERVE(dev_priv,
                                                      dirty->fifo_reserve_size);
                        if (!dirty->cmd)
                                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_validation_finish - Helper for post KMS command submission
 * cleanup and fencing
 * @dev_priv: Pointer to the device-private struct
 * @file_priv: Pointer identifying the client when user-space fencing is used
 * @ctx: Pointer to the validation context
 * @out_fence: If non-NULL, returned refcounted fence-pointer
 * @user_fence_rep: If non-NULL, pointer to user-space address area
 * in which to copy user-space fence info
 */
void vmw_kms_helper_validation_finish(struct vmw_private *dev_priv,
                                      struct drm_file *file_priv,
                                      struct vmw_validation_context *ctx,
                                      struct vmw_fence_obj **out_fence,
                                      struct drm_vmw_fence_rep __user *
                                      user_fence_rep)
{
        struct vmw_fence_obj *fence = NULL;
        uint32_t handle = 0;
        int ret = 0;

        if (file_priv || user_fence_rep || vmw_validation_has_bos(ctx) ||
            out_fence)
                ret = vmw_execbuf_fence_commands(file_priv, dev_priv, &fence,
                                                 file_priv ? &handle : NULL);
        vmw_validation_done(ctx, fence);
        if (file_priv)
                vmw_execbuf_copy_fence_user(dev_priv, vmw_fpriv(file_priv),
                                            ret, user_fence_rep, fence,
                                            handle, -1);
        if (out_fence)
                *out_fence = fence;
        else
                vmw_fence_obj_unreference(&fence);
}

/**
 * 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)->metadata.base_size;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdUpdateGBImage body;
        } *cmd;
        SVGA3dBox *box;
        size_t copy_size = 0;
        int i;

        if (!clips)
                return 0;

        cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd) * num_clips);
        if (!cmd)
                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_cmd_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;
        int ret = 0;

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

                ++i;
        }

        if (&con->head == &dev_priv->drm.mode_config.connector_list) {
                DRM_ERROR("Could not find initial display unit.\n");
                ret = -EINVAL;
                goto out_unlock;
        }

        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");
                ret = -EINVAL;
                goto out_unlock;
        }

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

 out_unlock:
        mutex_unlock(&dev_priv->drm.mode_config.mutex);

        return ret;
}

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

        dev_priv->implicit_placement_property =
                drm_property_create_range(&dev_priv->drm,
                                          DRM_MODE_PROP_IMMUTABLE,
                                          "implicit_placement", 0, 1);
}

/**
 * vmw_kms_suspend - Save modesetting state and turn modesetting off.
 *
 * @dev: Pointer to the drm device
 * Return: 0 on success. Negative error code on failure.
 */
int vmw_kms_suspend(struct drm_device *dev)
{
        struct vmw_private *dev_priv = vmw_priv(dev);

        dev_priv->suspend_state = drm_atomic_helper_suspend(dev);
        if (IS_ERR(dev_priv->suspend_state)) {
                int ret = PTR_ERR(dev_priv->suspend_state);

                DRM_ERROR("Failed kms suspend: %d\n", ret);
                dev_priv->suspend_state = NULL;

                return ret;
        }

        return 0;
}


/**
 * vmw_kms_resume - Re-enable modesetting and restore state
 *
 * @dev: Pointer to the drm device
 * Return: 0 on success. Negative error code on failure.
 *
 * State is resumed from a previous vmw_kms_suspend(). It's illegal
 * to call this function without a previous vmw_kms_suspend().
 */
int vmw_kms_resume(struct drm_device *dev)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        int ret;

        if (WARN_ON(!dev_priv->suspend_state))
                return 0;

        ret = drm_atomic_helper_resume(dev, dev_priv->suspend_state);
        dev_priv->suspend_state = NULL;

        return ret;
}

/**
 * vmw_kms_lost_device - Notify kms that modesetting capabilities will be lost
 *
 * @dev: Pointer to the drm device
 */
void vmw_kms_lost_device(struct drm_device *dev)
{
        drm_atomic_helper_shutdown(dev);
}

/**
 * vmw_du_helper_plane_update - Helper to do plane update on a display unit.
 * @update: The closure structure.
 *
 * Call this helper after setting callbacks in &vmw_du_update_plane to do plane
 * update on display unit.
 *
 * Return: 0 on success or a negative error code on failure.
 */
int vmw_du_helper_plane_update(struct vmw_du_update_plane *update)
{
        struct drm_plane_state *state = update->plane->state;
        struct drm_plane_state *old_state = update->old_state;
        struct drm_atomic_helper_damage_iter iter;
        struct drm_rect clip;
        struct drm_rect bb;
        DECLARE_VAL_CONTEXT(val_ctx, NULL, 0);
        uint32_t reserved_size = 0;
        uint32_t submit_size = 0;
        uint32_t curr_size = 0;
        uint32_t num_hits = 0;
        void *cmd_start;
        char *cmd_next;
        int ret;

        /*
         * Iterate in advance to check if really need plane update and find the
         * number of clips that actually are in plane src for fifo allocation.
         */
        drm_atomic_helper_damage_iter_init(&iter, old_state, state);
        drm_atomic_for_each_plane_damage(&iter, &clip)
                num_hits++;

        if (num_hits == 0)
                return 0;

        if (update->vfb->bo) {
                struct vmw_framebuffer_bo *vfbbo =
                        container_of(update->vfb, typeof(*vfbbo), base);

                ret = vmw_validation_add_bo(&val_ctx, vfbbo->buffer, false,
                                            update->cpu_blit);
        } else {
                struct vmw_framebuffer_surface *vfbs =
                        container_of(update->vfb, typeof(*vfbs), base);

                ret = vmw_validation_add_resource(&val_ctx, &vfbs->surface->res,
                                                  0, VMW_RES_DIRTY_NONE, NULL,
                                                  NULL);
        }

        if (ret)
                return ret;

        ret = vmw_validation_prepare(&val_ctx, update->mutex, update->intr);
        if (ret)
                goto out_unref;

        reserved_size = update->calc_fifo_size(update, num_hits);
        cmd_start = VMW_CMD_RESERVE(update->dev_priv, reserved_size);
        if (!cmd_start) {
                ret = -ENOMEM;
                goto out_revert;
        }

        cmd_next = cmd_start;

        if (update->post_prepare) {
                curr_size = update->post_prepare(update, cmd_next);
                cmd_next += curr_size;
                submit_size += curr_size;
        }

        if (update->pre_clip) {
                curr_size = update->pre_clip(update, cmd_next, num_hits);
                cmd_next += curr_size;
                submit_size += curr_size;
        }

        bb.x1 = INT_MAX;
        bb.y1 = INT_MAX;
        bb.x2 = INT_MIN;
        bb.y2 = INT_MIN;

        drm_atomic_helper_damage_iter_init(&iter, old_state, state);
        drm_atomic_for_each_plane_damage(&iter, &clip) {
                uint32_t fb_x = clip.x1;
                uint32_t fb_y = clip.y1;

                vmw_du_translate_to_crtc(state, &clip);
                if (update->clip) {
                        curr_size = update->clip(update, cmd_next, &clip, fb_x,
                                                 fb_y);
                        cmd_next += curr_size;
                        submit_size += curr_size;
                }
                bb.x1 = min_t(int, bb.x1, clip.x1);
                bb.y1 = min_t(int, bb.y1, clip.y1);
                bb.x2 = max_t(int, bb.x2, clip.x2);
                bb.y2 = max_t(int, bb.y2, clip.y2);
        }

        curr_size = update->post_clip(update, cmd_next, &bb);
        submit_size += curr_size;

        if (reserved_size < submit_size)
                submit_size = 0;

        vmw_cmd_commit(update->dev_priv, submit_size);

        vmw_kms_helper_validation_finish(update->dev_priv, NULL, &val_ctx,
                                         update->out_fence, NULL);
        return ret;

out_revert:
        vmw_validation_revert(&val_ctx);

out_unref:
        vmw_validation_unref_lists(&val_ctx);
        return ret;
}