source: vbox/trunk/src/VBox/Additions/linux/drm/vbox_irq.c@ 66523

/* $Id: vbox_irq.c 66523 2017-04-12 10:22:50Z vboxsync $ */
/** @file
 * VirtualBox Additions Linux kernel video driver
 */

/*
 * Copyright (C) 2016 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 * --------------------------------------------------------------------
 *
 * This code is based on
 * qxl_irq.c
 * with the following copyright and permission notice:
 *
 * Copyright 2013 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Dave Airlie
 *          Alon Levy
 */

#include "vbox_drv.h"

#include <VBoxVideo.h>

#include <drm/drm_crtc_helper.h>

static void vbox_clear_irq(void)
{
    outl((uint32_t)~0, VGA_PORT_HGSMI_HOST);
}

static uint32_t vbox_get_flags(struct vbox_private *vbox)
{
        return readl(vbox->guest_heap + HOST_FLAGS_OFFSET);
}

void vbox_report_hotplug(struct vbox_private *vbox)
{
    schedule_work(&vbox->hotplug_work);
}

irqreturn_t vbox_irq_handler(int irq, void *arg)
{
    struct drm_device *dev = (struct drm_device *) arg;
    struct vbox_private *vbox = (struct vbox_private *)dev->dev_private;
    uint32_t host_flags = vbox_get_flags(vbox);

    if (!(host_flags & HGSMIHOSTFLAGS_IRQ))
        return IRQ_NONE;

    /* Due to a bug in the initial host implementation of hot-plug interrupts,
     * the hot-plug and cursor capability flags were never cleared.  Fortunately
     * we can tell when they would have been set by checking that the VSYNC flag
     * is not set. */
    if (   host_flags & (HGSMIHOSTFLAGS_HOTPLUG | HGSMIHOSTFLAGS_CURSOR_CAPABILITIES)
        && !(host_flags & HGSMIHOSTFLAGS_VSYNC))
        vbox_report_hotplug(vbox);
    vbox_clear_irq();
    return IRQ_HANDLED;
}

/** Check that the position hints provided by the host are suitable for GNOME
 * shell (i.e. all screens disjoint and hints for all enabled screens) and if
 * not replace them with default ones.  Providing valid hints improves the
 * chances that we will get a known screen layout for pointer mapping. */
static void validate_or_set_position_hints(struct vbox_private *vbox)
{
    int i, j;
    uint16_t currentx = 0;
    bool valid = true;

    for (i = 0; i < vbox->num_crtcs; ++i) {
        for (j = 0; j < i; ++j) {
            struct VBVAMODEHINT *hintsi = &vbox->last_mode_hints[i];
            struct VBVAMODEHINT *hintsj = &vbox->last_mode_hints[j];

            if (hintsi->fEnabled && hintsj->fEnabled) {
                if ((hintsi->dx >= 0xffff || hintsi->dy >= 0xffff ||
                     hintsj->dx >= 0xffff || hintsj->dy >= 0xffff) ||
                    (hintsi->dx < hintsj->dx + (hintsj->cx & 0x8fff) &&
                     hintsi->dx + (hintsi->cx & 0x8fff) > hintsj->dx) ||
                    (hintsi->dy < hintsj->dy + (hintsj->cy & 0x8fff) &&
                     hintsi->dy + (hintsi->cy & 0x8fff) > hintsj->dy))
                    valid = false;
            }
        }
    }
    if (!valid)
        for (i = 0; i < vbox->num_crtcs; ++i) {
            if (vbox->last_mode_hints[i].fEnabled) {
                vbox->last_mode_hints[i].dx = currentx;
                vbox->last_mode_hints[i].dy = 0;
                currentx += vbox->last_mode_hints[i].cx & 0x8fff;
            }
        }
}

/**
 * Query the host for the most recent video mode hints.
 */
static void vbox_update_mode_hints(struct vbox_private *vbox)
{
    struct drm_device *dev = vbox->dev;
    struct drm_connector *connector;
    struct vbox_connector *vbox_connector;
    struct VBVAMODEHINT *hints;
    uint16_t flags;
    bool disconnected;
    unsigned crtc_id;
    int rc;

    rc = VBoxHGSMIGetModeHints(&vbox->submit_info, vbox->num_crtcs,
                               vbox->last_mode_hints);
    if (RT_FAILURE(rc)) {
        printk("vboxvideo: VBoxHGSMIGetModeHints failed, rc=%i.\n", rc);
        return;
    }
    validate_or_set_position_hints(vbox);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
    drm_modeset_lock_all(dev);
#else
    mutex_lock(&dev->mode_config.mutex);
#endif
    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
        vbox_connector = to_vbox_connector(connector);
        hints = &vbox->last_mode_hints[vbox_connector->vbox_crtc->crtc_id];
        if (hints->magic == VBVAMODEHINT_MAGIC) {
            disconnected = !(hints->fEnabled);
            crtc_id = vbox_connector->vbox_crtc->crtc_id;
            flags =   VBVA_SCREEN_F_ACTIVE
                    | (disconnected ? VBVA_SCREEN_F_DISABLED : VBVA_SCREEN_F_BLANK);
            vbox_connector->mode_hint.width = hints->cx & 0x8fff;
            vbox_connector->mode_hint.height = hints->cy & 0x8fff;
            vbox_connector->vbox_crtc->x_hint = hints->dx;
            vbox_connector->vbox_crtc->y_hint = hints->dy;
            vbox_connector->mode_hint.disconnected = disconnected;
            if (vbox_connector->vbox_crtc->disconnected != disconnected) {
                VBoxHGSMIProcessDisplayInfo(&vbox->submit_info, crtc_id,
                                            0, 0, 0, hints->cx * 4, hints->cx,
                                            hints->cy, 0, flags);
                vbox_connector->vbox_crtc->disconnected = disconnected;
            }
        }
    }
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0)
    drm_modeset_unlock_all(dev);
#else
    mutex_unlock(&dev->mode_config.mutex);
#endif
}

static void vbox_hotplug_worker(struct work_struct *work)
{
    struct vbox_private *vbox = container_of(work, struct vbox_private,
                                             hotplug_work);

    vbox_update_mode_hints(vbox);
    drm_kms_helper_hotplug_event(vbox->dev);
}

int vbox_irq_init(struct vbox_private *vbox)
{
    int ret;

    vbox_update_mode_hints(vbox);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
    ret = drm_irq_install(vbox->dev, vbox->dev->pdev->irq);
#else
    ret = drm_irq_install(vbox->dev);
#endif
    if (unlikely(ret != 0)) {
        vbox_irq_fini(vbox);
        DRM_ERROR("Failed installing irq: %d\n", ret);
        return 1;
    }
    INIT_WORK(&vbox->hotplug_work, vbox_hotplug_worker);
    vbox->isr_installed = true;
    return 0;
}

void vbox_irq_fini(struct vbox_private *vbox)
{
    if (vbox->isr_installed) {
        drm_irq_uninstall(vbox->dev);
        flush_work(&vbox->hotplug_work);
        vbox->isr_installed = false;
    }
}