vmwgfx_ldu.c

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/**************************************************************************
 *
 * Copyright © 2009 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"


#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;
};

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_display_unit_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 vmw_display_unit *du = NULL;
    struct drm_framebuffer *fb = NULL;
    struct drm_crtc *crtc = NULL;
    int i = 0, ret;

    /* 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.fb;

        return vmw_kms_write_svga(dev_priv, w, h, fb->pitches[0],
                      fb->bits_per_pixel, fb->depth);
    }

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

        vmw_kms_write_svga(dev_priv, fb->width, fb->height, fb->pitches[0],
                   fb->bits_per_pixel, fb->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;


    /* Find the first du with a cursor. */
    list_for_each_entry(entry, &lds->active, active) {
        du = &entry->base;

        if (!du->cursor_dmabuf)
            continue;

        ret = vmw_cursor_update_dmabuf(dev_priv,
                           du->cursor_dmabuf,
                           64, 64,
                           du->hotspot_x,
                           du->hotspot_y);
        if (ret == 0)
            break;

        DRM_ERROR("Could not update cursor image\n");
    }

    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);
        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;
}

static int vmw_ldu_crtc_set_config(struct drm_mode_set *set)
{
    struct vmw_private *dev_priv;
    struct vmw_legacy_display_unit *ldu;
    struct drm_connector *connector;
    struct drm_display_mode *mode;
    struct drm_encoder *encoder;
    struct vmw_framebuffer *vfb;
    struct drm_framebuffer *fb;
    struct drm_crtc *crtc;

    if (!set)
        return -EINVAL;

    if (!set->crtc)
        return -EINVAL;

    /* get the ldu */
    crtc = set->crtc;
    ldu = vmw_crtc_to_ldu(crtc);
    vfb = set->fb ? vmw_framebuffer_to_vfb(set->fb) : NULL;
    dev_priv = vmw_priv(crtc->dev);

    if (set->num_connectors > 1) {
        DRM_ERROR("to many connectors\n");
        return -EINVAL;
    }

    if (set->num_connectors == 1 &&
        set->connectors[0] != &ldu->base.connector) {
        DRM_ERROR("connector doesn't match %p %p\n",
            set->connectors[0], &ldu->base.connector);
        return -EINVAL;
    }

    /* ldu only supports one fb active at the time */
    if (dev_priv->ldu_priv->fb && vfb &&
        !(dev_priv->ldu_priv->num_active == 1 &&
          !list_empty(&ldu->active)) &&
        dev_priv->ldu_priv->fb != vfb) {
        DRM_ERROR("Multiple framebuffers not supported\n");
        return -EINVAL;
    }

    /* since they always map one to one these are safe */
    connector = &ldu->base.connector;
    encoder = &ldu->base.encoder;

    /* should we turn the crtc off? */
    if (set->num_connectors == 0 || !set->mode || !set->fb) {

        connector->encoder = NULL;
        encoder->crtc = NULL;
        crtc->fb = NULL;

        vmw_ldu_del_active(dev_priv, ldu);

        return vmw_ldu_commit_list(dev_priv);
    }


    /* we now know we want to set a mode */
    mode = set->mode;
    fb = set->fb;

    if (set->x + mode->hdisplay > fb->width ||
        set->y + mode->vdisplay > fb->height) {
        DRM_ERROR("set outside of framebuffer\n");
        return -EINVAL;
    }

    vmw_fb_off(dev_priv);

    crtc->fb = fb;
    encoder->crtc = crtc;
    connector->encoder = encoder;
    crtc->x = set->x;
    crtc->y = set->y;
    crtc->mode = *mode;

    vmw_ldu_add_active(dev_priv, ldu, vfb);

    return vmw_ldu_commit_list(dev_priv);
}

static struct drm_crtc_funcs vmw_legacy_crtc_funcs = {
    .save = vmw_du_crtc_save,
    .restore = vmw_du_crtc_restore,
    .cursor_set = vmw_du_crtc_cursor_set,
    .cursor_move = vmw_du_crtc_cursor_move,
    .gamma_set = vmw_du_crtc_gamma_set,
    .destroy = vmw_ldu_crtc_destroy,
    .set_config = vmw_ldu_crtc_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 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 struct drm_connector_funcs vmw_legacy_connector_funcs = {
    .dpms = vmw_du_connector_dpms,
    .save = vmw_du_connector_save,
    .restore = vmw_du_connector_restore,
    .detect = vmw_du_connector_detect,
    .fill_modes = vmw_du_connector_fill_modes,
    .set_property = vmw_du_connector_set_property,
    .destroy = vmw_ldu_connector_destroy,
};

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_crtc *crtc;

    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;

    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;
    ldu->base.is_implicit = true;

    drm_connector_init(dev, connector, &vmw_legacy_connector_funcs,
               DRM_MODE_CONNECTOR_VIRTUAL);
    connector->status = vmw_du_connector_detect(connector, true);

    drm_encoder_init(dev, encoder, &vmw_legacy_encoder_funcs,
             DRM_MODE_ENCODER_VIRTUAL);
    drm_mode_connector_attach_encoder(connector, encoder);
    encoder->possible_crtcs = (1 << unit);
    encoder->possible_clones = 0;

    drm_crtc_init(dev, crtc, &vmw_legacy_crtc_funcs);

    drm_mode_crtc_set_gamma_size(crtc, 256);

    drm_connector_attach_property(connector,
                      dev->mode_config.dirty_info_property,
                      1);

    return 0;
}

int vmw_kms_init_legacy_display_system(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;

    ret = drm_mode_create_dirty_info_property(dev);
    if (ret != 0)
        goto err_vblank_cleanup;

    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);

    return 0;

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

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

    if (!dev_priv->ldu_priv)
        return -ENOSYS;

    drm_vblank_cleanup(dev);

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

    kfree(dev_priv->ldu_priv);

    return 0;
}