/**************************************************************************
 *
 * Copyright © 2009-2015 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include "vmwgfx_kms.h"
#include <drm/drm_plane_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>


#define vmw_crtc_to_ldu(x) \
        container_of(x, struct vmw_legacy_display_unit, base.crtc)
#define vmw_encoder_to_ldu(x) \
        container_of(x, struct vmw_legacy_display_unit, base.encoder)
#define vmw_connector_to_ldu(x) \
        container_of(x, struct vmw_legacy_display_unit, base.connector)

struct vmw_legacy_display {
        struct list_head active;

        unsigned num_active;
        unsigned last_num_active;

        struct vmw_framebuffer *fb;
};

/**
 * Display unit using the legacy register interface.
 */
struct vmw_legacy_display_unit {
        struct vmw_display_unit base;

        struct list_head active;
};

static void vmw_ldu_destroy(struct vmw_legacy_display_unit *ldu)
{
        list_del_init(&ldu->active);
        vmw_du_cleanup(&ldu->base);
        kfree(ldu);
}


/*
 * Legacy Display Unit CRTC functions
 */

static void vmw_ldu_crtc_destroy(struct drm_crtc *crtc)
{
        vmw_ldu_destroy(vmw_crtc_to_ldu(crtc));
}

static int vmw_ldu_commit_list(struct vmw_private *dev_priv)
{
        struct vmw_legacy_display *lds = dev_priv->ldu_priv;
        struct vmw_legacy_display_unit *entry;
        struct drm_framebuffer *fb = NULL;
        struct drm_crtc *crtc = NULL;
        int i = 0;

        /* If there is no display topology the host just assumes
         * that the guest will set the same layout as the host.
         */
        if (!(dev_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY)) {
                int w = 0, h = 0;
                list_for_each_entry(entry, &lds->active, active) {
                        crtc = &entry->base.crtc;
                        w = max(w, crtc->x + crtc->mode.hdisplay);
                        h = max(h, crtc->y + crtc->mode.vdisplay);
                        i++;
                }

                if (crtc == NULL)
                        return 0;
                fb = entry->base.crtc.primary->state->fb;

                return vmw_kms_write_svga(dev_priv, w, h, fb->pitches[0],
                                          fb->format->cpp[0] * 8,
                                          fb->format->depth);
        }

        if (!list_empty(&lds->active)) {
                entry = list_entry(lds->active.next, typeof(*entry), active);
                fb = entry->base.crtc.primary->state->fb;

                vmw_kms_write_svga(dev_priv, fb->width, fb->height, fb->pitches[0],
                                   fb->format->cpp[0] * 8, fb->format->depth);
        }

        /* Make sure we always show something. */
        vmw_write(dev_priv, SVGA_REG_NUM_GUEST_DISPLAYS,
                  lds->num_active ? lds->num_active : 1);

        i = 0;
        list_for_each_entry(entry, &lds->active, active) {
                crtc = &entry->base.crtc;

                vmw_write(dev_priv, SVGA_REG_DISPLAY_ID, i);
                vmw_write(dev_priv, SVGA_REG_DISPLAY_IS_PRIMARY, !i);
                vmw_write(dev_priv, SVGA_REG_DISPLAY_POSITION_X, crtc->x);
                vmw_write(dev_priv, SVGA_REG_DISPLAY_POSITION_Y, crtc->y);
                vmw_write(dev_priv, SVGA_REG_DISPLAY_WIDTH, crtc->mode.hdisplay);
                vmw_write(dev_priv, SVGA_REG_DISPLAY_HEIGHT, crtc->mode.vdisplay);
                vmw_write(dev_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);

                i++;
        }

        BUG_ON(i != lds->num_active);

        lds->last_num_active = lds->num_active;

        return 0;
}

static int vmw_ldu_del_active(struct vmw_private *vmw_priv,
                              struct vmw_legacy_display_unit *ldu)
{
        struct vmw_legacy_display *ld = vmw_priv->ldu_priv;
        if (list_empty(&ldu->active))
                return 0;

        /* Must init otherwise list_empty(&ldu->active) will not work. */
        list_del_init(&ldu->active);
        if (--(ld->num_active) == 0) {
                BUG_ON(!ld->fb);
                if (ld->fb->unpin)
                        ld->fb->unpin(ld->fb);
                ld->fb = NULL;
        }

        return 0;
}

static int vmw_ldu_add_active(struct vmw_private *vmw_priv,
                              struct vmw_legacy_display_unit *ldu,
                              struct vmw_framebuffer *vfb)
{
        struct vmw_legacy_display *ld = vmw_priv->ldu_priv;
        struct vmw_legacy_display_unit *entry;
        struct list_head *at;

        BUG_ON(!ld->num_active && ld->fb);
        if (vfb != ld->fb) {
                if (ld->fb && ld->fb->unpin)
                        ld->fb->unpin(ld->fb);
                vmw_svga_enable(vmw_priv);
                if (vfb->pin)
                        vfb->pin(vfb);
                ld->fb = vfb;
        }

        if (!list_empty(&ldu->active))
                return 0;

        at = &ld->active;
        list_for_each_entry(entry, &ld->active, active) {
                if (entry->base.unit > ldu->base.unit)
                        break;

                at = &entry->active;
        }

        list_add(&ldu->active, at);

        ld->num_active++;

        return 0;
}

/**
 * vmw_ldu_crtc_mode_set_nofb - Enable svga
 *
 * @crtc: CRTC associated with the new screen
 *
 * For LDU, just enable the svga
 */
static void vmw_ldu_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
}

/**
 * vmw_ldu_crtc_atomic_enable - Noop
 *
 * @crtc: CRTC associated with the new screen
 *
 * This is called after a mode set has been completed.  Here's
 * usually a good place to call vmw_ldu_add_active/vmw_ldu_del_active
 * but since for LDU the display plane is closely tied to the
 * CRTC, it makes more sense to do those at plane update time.
 */
static void vmw_ldu_crtc_atomic_enable(struct drm_crtc *crtc,
                                       struct drm_crtc_state *old_state)
{
}

/**
 * vmw_ldu_crtc_atomic_disable - Turns off CRTC
 *
 * @crtc: CRTC to be turned off
 */
static void vmw_ldu_crtc_atomic_disable(struct drm_crtc *crtc,
                                        struct drm_crtc_state *old_state)
{
}

static const struct drm_crtc_funcs vmw_legacy_crtc_funcs = {
        .gamma_set = vmw_du_crtc_gamma_set,
        .destroy = vmw_ldu_crtc_destroy,
        .reset = vmw_du_crtc_reset,
        .atomic_duplicate_state = vmw_du_crtc_duplicate_state,
        .atomic_destroy_state = vmw_du_crtc_destroy_state,
        .set_config = vmw_kms_set_config,
};


/*
 * Legacy Display Unit encoder functions
 */

static void vmw_ldu_encoder_destroy(struct drm_encoder *encoder)
{
        vmw_ldu_destroy(vmw_encoder_to_ldu(encoder));
}

static const struct drm_encoder_funcs vmw_legacy_encoder_funcs = {
        .destroy = vmw_ldu_encoder_destroy,
};

/*
 * Legacy Display Unit connector functions
 */

static void vmw_ldu_connector_destroy(struct drm_connector *connector)
{
        vmw_ldu_destroy(vmw_connector_to_ldu(connector));
}

static const struct drm_connector_funcs vmw_legacy_connector_funcs = {
        .dpms = vmw_du_connector_dpms,
        .detect = vmw_du_connector_detect,
        .fill_modes = vmw_du_connector_fill_modes,
        .set_property = vmw_du_connector_set_property,
        .destroy = vmw_ldu_connector_destroy,
        .reset = vmw_du_connector_reset,
        .atomic_duplicate_state = vmw_du_connector_duplicate_state,
        .atomic_destroy_state = vmw_du_connector_destroy_state,
        .atomic_set_property = vmw_du_connector_atomic_set_property,
        .atomic_get_property = vmw_du_connector_atomic_get_property,
};

static const struct
drm_connector_helper_funcs vmw_ldu_connector_helper_funcs = {
        .best_encoder = drm_atomic_helper_best_encoder,
};

/*
 * Legacy Display Plane Functions
 */

/**
 * vmw_ldu_primary_plane_cleanup_fb - Noop
 *
 * @plane:  display plane
 * @old_state: Contains the FB to clean up
 *
 * Unpins the display surface
 *
 * Returns 0 on success
 */
static void
vmw_ldu_primary_plane_cleanup_fb(struct drm_plane *plane,
                                 struct drm_plane_state *old_state)
{
}


/**
 * vmw_ldu_primary_plane_prepare_fb - Noop
 *
 * @plane:  display plane
 * @new_state: info on the new plane state, including the FB
 *
 * Returns 0 on success
 */
static int
vmw_ldu_primary_plane_prepare_fb(struct drm_plane *plane,
                                 struct drm_plane_state *new_state)
{
        return 0;
}


static void
vmw_ldu_primary_plane_atomic_update(struct drm_plane *plane,
                                    struct drm_plane_state *old_state)
{
        struct vmw_private *dev_priv;
        struct vmw_legacy_display_unit *ldu;
        struct vmw_framebuffer *vfb;
        struct drm_framebuffer *fb;
        struct drm_crtc *crtc = plane->state->crtc ?: old_state->crtc;


        ldu = vmw_crtc_to_ldu(crtc);
        dev_priv = vmw_priv(plane->dev);
        fb       = plane->state->fb;

        vfb = (fb) ? vmw_framebuffer_to_vfb(fb) : NULL;

        if (vfb)
                vmw_ldu_add_active(dev_priv, ldu, vfb);
        else
                vmw_ldu_del_active(dev_priv, ldu);

        vmw_ldu_commit_list(dev_priv);
}


static const struct drm_plane_funcs vmw_ldu_plane_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = vmw_du_primary_plane_destroy,
        .reset = vmw_du_plane_reset,
        .atomic_duplicate_state = vmw_du_plane_duplicate_state,
        .atomic_destroy_state = vmw_du_plane_destroy_state,
};

static const struct drm_plane_funcs vmw_ldu_cursor_funcs = {
        .update_plane = drm_atomic_helper_update_plane,
        .disable_plane = drm_atomic_helper_disable_plane,
        .destroy = vmw_du_cursor_plane_destroy,
        .reset = vmw_du_plane_reset,
        .atomic_duplicate_state = vmw_du_plane_duplicate_state,
        .atomic_destroy_state = vmw_du_plane_destroy_state,
};

/*
 * Atomic Helpers
 */
static const struct
drm_plane_helper_funcs vmw_ldu_cursor_plane_helper_funcs = {
        .atomic_check = vmw_du_cursor_plane_atomic_check,
        .atomic_update = vmw_du_cursor_plane_atomic_update,
        .prepare_fb = vmw_du_cursor_plane_prepare_fb,
        .cleanup_fb = vmw_du_plane_cleanup_fb,
};

static const struct
drm_plane_helper_funcs vmw_ldu_primary_plane_helper_funcs = {
        .atomic_check = vmw_du_primary_plane_atomic_check,
        .atomic_update = vmw_ldu_primary_plane_atomic_update,
        .prepare_fb = vmw_ldu_primary_plane_prepare_fb,
        .cleanup_fb = vmw_ldu_primary_plane_cleanup_fb,
};

static const struct drm_crtc_helper_funcs vmw_ldu_crtc_helper_funcs = {
        .mode_set_nofb = vmw_ldu_crtc_mode_set_nofb,
        .atomic_check = vmw_du_crtc_atomic_check,
        .atomic_begin = vmw_du_crtc_atomic_begin,
        .atomic_flush = vmw_du_crtc_atomic_flush,
        .atomic_enable = vmw_ldu_crtc_atomic_enable,
        .atomic_disable = vmw_ldu_crtc_atomic_disable,
};


static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
{
        struct vmw_legacy_display_unit *ldu;
        struct drm_device *dev = dev_priv->dev;
        struct drm_connector *connector;
        struct drm_encoder *encoder;
        struct drm_plane *primary, *cursor;
        struct drm_crtc *crtc;
        int ret;

        ldu = kzalloc(sizeof(*ldu), GFP_KERNEL);
        if (!ldu)
                return -ENOMEM;

        ldu->base.unit = unit;
        crtc = &ldu->base.crtc;
        encoder = &ldu->base.encoder;
        connector = &ldu->base.connector;
        primary = &ldu->base.primary;
        cursor = &ldu->base.cursor;

        INIT_LIST_HEAD(&ldu->active);

        ldu->base.pref_active = (unit == 0);
        ldu->base.pref_width = dev_priv->initial_width;
        ldu->base.pref_height = dev_priv->initial_height;
        ldu->base.pref_mode = NULL;

        /*
         * Remove this after enabling atomic because property values can
         * only exist in a state object
         */
        ldu->base.is_implicit = true;

        /* Initialize primary plane */
        vmw_du_plane_reset(primary);

        ret = drm_universal_plane_init(dev, &ldu->base.primary,
                                       0, &vmw_ldu_plane_funcs,
                                       vmw_primary_plane_formats,
                                       ARRAY_SIZE(vmw_primary_plane_formats),
                                       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
        if (ret) {
                DRM_ERROR("Failed to initialize primary plane");
                goto err_free;
        }

        drm_plane_helper_add(primary, &vmw_ldu_primary_plane_helper_funcs);

        /* Initialize cursor plane */
        vmw_du_plane_reset(cursor);

        ret = drm_universal_plane_init(dev, &ldu->base.cursor,
                        0, &vmw_ldu_cursor_funcs,
                        vmw_cursor_plane_formats,
                        ARRAY_SIZE(vmw_cursor_plane_formats),
                        NULL, DRM_PLANE_TYPE_CURSOR, NULL);
        if (ret) {
                DRM_ERROR("Failed to initialize cursor plane");
                drm_plane_cleanup(&ldu->base.primary);
                goto err_free;
        }

        drm_plane_helper_add(cursor, &vmw_ldu_cursor_plane_helper_funcs);


        vmw_du_connector_reset(connector);
        ret = drm_connector_init(dev, connector, &vmw_legacy_connector_funcs,
                                 DRM_MODE_CONNECTOR_VIRTUAL);
        if (ret) {
                DRM_ERROR("Failed to initialize connector\n");
                goto err_free;
        }

        drm_connector_helper_add(connector, &vmw_ldu_connector_helper_funcs);
        connector->status = vmw_du_connector_detect(connector, true);
        vmw_connector_state_to_vcs(connector->state)->is_implicit = true;


        ret = drm_encoder_init(dev, encoder, &vmw_legacy_encoder_funcs,
                               DRM_MODE_ENCODER_VIRTUAL, NULL);
        if (ret) {
                DRM_ERROR("Failed to initialize encoder\n");
                goto err_free_connector;
        }

        (void) drm_mode_connector_attach_encoder(connector, encoder);
        encoder->possible_crtcs = (1 << unit);
        encoder->possible_clones = 0;

        ret = drm_connector_register(connector);
        if (ret) {
                DRM_ERROR("Failed to register connector\n");
                goto err_free_encoder;
        }


        vmw_du_crtc_reset(crtc);
        ret = drm_crtc_init_with_planes(dev, crtc, &ldu->base.primary,
                                        &ldu->base.cursor,
                                        &vmw_legacy_crtc_funcs, NULL);
        if (ret) {
                DRM_ERROR("Failed to initialize CRTC\n");
                goto err_free_unregister;
        }

        drm_crtc_helper_add(crtc, &vmw_ldu_crtc_helper_funcs);

        drm_mode_crtc_set_gamma_size(crtc, 256);

        drm_object_attach_property(&connector->base,
                                   dev_priv->hotplug_mode_update_property, 1);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.suggested_x_property, 0);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.suggested_y_property, 0);
        if (dev_priv->implicit_placement_property)
                drm_object_attach_property
                        (&connector->base,
                         dev_priv->implicit_placement_property,
                         1);

        return 0;

err_free_unregister:
        drm_connector_unregister(connector);
err_free_encoder:
        drm_encoder_cleanup(encoder);
err_free_connector:
        drm_connector_cleanup(connector);
err_free:
        kfree(ldu);
        return ret;
}

int vmw_kms_ldu_init_display(struct vmw_private *dev_priv)
{
        struct drm_device *dev = dev_priv->dev;
        int i, ret;

        if (dev_priv->ldu_priv) {
                DRM_INFO("ldu system already on\n");
                return -EINVAL;
        }

        dev_priv->ldu_priv = kmalloc(sizeof(*dev_priv->ldu_priv), GFP_KERNEL);
        if (!dev_priv->ldu_priv)
                return -ENOMEM;

        INIT_LIST_HEAD(&dev_priv->ldu_priv->active);
        dev_priv->ldu_priv->num_active = 0;
        dev_priv->ldu_priv->last_num_active = 0;
        dev_priv->ldu_priv->fb = NULL;

        /* for old hardware without multimon only enable one display */
        if (dev_priv->capabilities & SVGA_CAP_MULTIMON)
                ret = drm_vblank_init(dev, VMWGFX_NUM_DISPLAY_UNITS);
        else
                ret = drm_vblank_init(dev, 1);
        if (ret != 0)
                goto err_free;

        vmw_kms_create_implicit_placement_property(dev_priv, true);

        if (dev_priv->capabilities & SVGA_CAP_MULTIMON)
                for (i = 0; i < VMWGFX_NUM_DISPLAY_UNITS; ++i)
                        vmw_ldu_init(dev_priv, i);
        else
                vmw_ldu_init(dev_priv, 0);

        dev_priv->active_display_unit = vmw_du_legacy;

        DRM_INFO("Legacy Display Unit initialized\n");

        return 0;

err_free:
        kfree(dev_priv->ldu_priv);
        dev_priv->ldu_priv = NULL;
        return ret;
}

int vmw_kms_ldu_close_display(struct vmw_private *dev_priv)
{
        if (!dev_priv->ldu_priv)
                return -ENOSYS;

        BUG_ON(!list_empty(&dev_priv->ldu_priv->active));

        kfree(dev_priv->ldu_priv);

        return 0;
}


int vmw_kms_ldu_do_dmabuf_dirty(struct vmw_private *dev_priv,
                                struct vmw_framebuffer *framebuffer,
                                unsigned flags, unsigned color,
                                struct drm_clip_rect *clips,
                                unsigned num_clips, int increment)
{
        size_t fifo_size;
        int i;

        struct {
                uint32_t header;
                SVGAFifoCmdUpdate body;
        } *cmd;

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

        memset(cmd, 0, fifo_size);
        for (i = 0; i < num_clips; i++, clips += increment) {
                cmd[i].header = SVGA_CMD_UPDATE;
                cmd[i].body.x = clips->x1;
                cmd[i].body.y = clips->y1;
                cmd[i].body.width = clips->x2 - clips->x1;
                cmd[i].body.height = clips->y2 - clips->y1;
        }

        vmw_fifo_commit(dev_priv, fifo_size);
        return 0;
}