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// SPDX-License-Identifier: MIT
/*
* Copyright (C) 2016-2017 Oracle Corporation
* This file is based on qxl_irq.c
* Copyright 2013 Red Hat Inc.
* Authors: Dave Airlie
* Alon Levy
* Michael Thayer <michael.thayer@oracle.com,
* Hans de Goede <hdegoede@redhat.com>
*/
#include <linux/pci.h>
#include <drm/drm_drv.h>
#include <drm/drm_probe_helper.h>
#include "vbox_drv.h"
#include "vboxvideo.h"
static void vbox_clear_irq(void)
{
outl((u32)~0, VGA_PORT_HGSMI_HOST);
}
static u32 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);
}
static irqreturn_t vbox_irq_handler(int irq, void *arg)
{
struct drm_device *dev = (struct drm_device *)arg;
struct vbox_private *vbox = to_vbox_dev(dev);
u32 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 irqs,
* 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)
{
struct vbva_modehint *hintsi, *hintsj;
bool valid = true;
u16 currentx = 0;
int i, j;
for (i = 0; i < vbox->num_crtcs; ++i) {
for (j = 0; j < i; ++j) {
hintsi = &vbox->last_mode_hints[i];
hintsj = &vbox->last_mode_hints[j];
if (hintsi->enabled && hintsj->enabled) {
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].enabled) {
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_connector_list_iter conn_iter;
struct drm_device *dev = &vbox->ddev;
struct drm_connector *connector;
struct vbox_connector *vbox_conn;
struct vbva_modehint *hints;
u16 flags;
bool disconnected;
unsigned int crtc_id;
int ret;
ret = hgsmi_get_mode_hints(vbox->guest_pool, vbox->num_crtcs,
vbox->last_mode_hints);
if (ret) {
DRM_ERROR("vboxvideo: hgsmi_get_mode_hints failed: %d\n", ret);
return;
}
validate_or_set_position_hints(vbox);
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
vbox_conn = to_vbox_connector(connector);
hints = &vbox->last_mode_hints[vbox_conn->vbox_crtc->crtc_id];
if (hints->magic != VBVAMODEHINT_MAGIC)
continue;
disconnected = !(hints->enabled);
crtc_id = vbox_conn->vbox_crtc->crtc_id;
vbox_conn->mode_hint.width = hints->cx;
vbox_conn->mode_hint.height = hints->cy;
vbox_conn->vbox_crtc->x_hint = hints->dx;
vbox_conn->vbox_crtc->y_hint = hints->dy;
vbox_conn->mode_hint.disconnected = disconnected;
if (vbox_conn->vbox_crtc->disconnected == disconnected)
continue;
if (disconnected)
flags = VBVA_SCREEN_F_ACTIVE | VBVA_SCREEN_F_DISABLED;
else
flags = VBVA_SCREEN_F_ACTIVE | VBVA_SCREEN_F_BLANK;
hgsmi_process_display_info(vbox->guest_pool, crtc_id, 0, 0, 0,
hints->cx * 4, hints->cx,
hints->cy, 0, flags);
vbox_conn->vbox_crtc->disconnected = disconnected;
}
drm_connector_list_iter_end(&conn_iter);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
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->ddev);
}
int vbox_irq_init(struct vbox_private *vbox)
{
struct drm_device *dev = &vbox->ddev;
struct pci_dev *pdev = to_pci_dev(dev->dev);
INIT_WORK(&vbox->hotplug_work, vbox_hotplug_worker);
vbox_update_mode_hints(vbox);
/* PCI devices require shared interrupts. */
return request_irq(pdev->irq, vbox_irq_handler, IRQF_SHARED, dev->driver->name, dev);
}
void vbox_irq_fini(struct vbox_private *vbox)
{
struct drm_device *dev = &vbox->ddev;
struct pci_dev *pdev = to_pci_dev(dev->dev);
free_irq(pdev->irq, dev);
flush_work(&vbox->hotplug_work);
}
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