source: vbox/trunk/src/VBox/Additions/linux/drm/vbox_irq.c@ 59598

/* $Id: vbox_irq.c 59598 2016-02-05 14:47:59Z 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 <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 (uint32_t)readl(vbox->vram + vbox->host_flags_offset);
}

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))
        schedule_work(&vbox->hotplug_work);
        vbox_clear_irq();
        return IRQ_HANDLED;
}

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

    LogFunc(("vboxvideo: %d: vbox=%p\n", __LINE__, vbox));
    drm_kms_helper_hotplug_event(vbox->dev);
    if (vbox->fbdev)
        drm_fb_helper_hotplug_event(&vbox->fbdev->helper);
}

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

    LogFunc(("vboxvideo: %d: vbox=%p\n", __LINE__, vbox));
        ret = drm_irq_install(vbox->dev, vbox->dev->pdev->irq);
        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;
    LogFunc(("vboxvideo: %d: vbox=%p\n", __LINE__, vbox));
        return 0;
}

void vbox_irq_fini(struct vbox_private *vbox)
{
    LogFunc(("vboxvideo: %d: vbox=%p\n", __LINE__, vbox));
    if (vbox->isr_installed) {
        drm_irq_uninstall(vbox->dev);
        flush_work(&vbox->hotplug_work);
        vbox->isr_installed = false;
    }
}