1// SPDX-License-Identifier: MIT
  2/*
  3 * Copyright (C) 2016-2017 Oracle Corporation
  4 * This file is based on qxl_irq.c
  5 * Copyright 2013 Red Hat Inc.
  6 * Authors: Dave Airlie
  7 *          Alon Levy
  8 *          Michael Thayer <michael.thayer@oracle.com,
  9 *          Hans de Goede <hdegoede@redhat.com>
 10 */
 11
 12#include <linux/pci.h>
 13#include <drm/drm_irq.h>
 14#include <drm/drm_probe_helper.h>
 15
 16#include "vbox_drv.h"
 17#include "vboxvideo.h"
 18
 19static void vbox_clear_irq(void)
 20{
 21	outl((u32)~0, VGA_PORT_HGSMI_HOST);
 22}
 23
 24static u32 vbox_get_flags(struct vbox_private *vbox)
 25{
 26	return readl(vbox->guest_heap + HOST_FLAGS_OFFSET);
 27}
 28
 29void vbox_report_hotplug(struct vbox_private *vbox)
 30{
 31	schedule_work(&vbox->hotplug_work);
 32}
 33
 34irqreturn_t vbox_irq_handler(int irq, void *arg)
 35{
 36	struct drm_device *dev = (struct drm_device *)arg;
 37	struct vbox_private *vbox = (struct vbox_private *)dev->dev_private;
 38	u32 host_flags = vbox_get_flags(vbox);
 39
 40	if (!(host_flags & HGSMIHOSTFLAGS_IRQ))
 41		return IRQ_NONE;
 42
 43	/*
 44	 * Due to a bug in the initial host implementation of hot-plug irqs,
 45	 * the hot-plug and cursor capability flags were never cleared.
 46	 * Fortunately we can tell when they would have been set by checking
 47	 * that the VSYNC flag is not set.
 48	 */
 49	if (host_flags &
 50	    (HGSMIHOSTFLAGS_HOTPLUG | HGSMIHOSTFLAGS_CURSOR_CAPABILITIES) &&
 51	    !(host_flags & HGSMIHOSTFLAGS_VSYNC))
 52		vbox_report_hotplug(vbox);
 53
 54	vbox_clear_irq();
 55
 56	return IRQ_HANDLED;
 57}
 58
 59/*
 60 * Check that the position hints provided by the host are suitable for GNOME
 61 * shell (i.e. all screens disjoint and hints for all enabled screens) and if
 62 * not replace them with default ones.  Providing valid hints improves the
 63 * chances that we will get a known screen layout for pointer mapping.
 64 */
 65static void validate_or_set_position_hints(struct vbox_private *vbox)
 66{
 67	struct vbva_modehint *hintsi, *hintsj;
 68	bool valid = true;
 69	u16 currentx = 0;
 70	int i, j;
 71
 72	for (i = 0; i < vbox->num_crtcs; ++i) {
 73		for (j = 0; j < i; ++j) {
 74			hintsi = &vbox->last_mode_hints[i];
 75			hintsj = &vbox->last_mode_hints[j];
 76
 77			if (hintsi->enabled && hintsj->enabled) {
 78				if (hintsi->dx >= 0xffff ||
 79				    hintsi->dy >= 0xffff ||
 80				    hintsj->dx >= 0xffff ||
 81				    hintsj->dy >= 0xffff ||
 82				    (hintsi->dx <
 83					hintsj->dx + (hintsj->cx & 0x8fff) &&
 84				     hintsi->dx + (hintsi->cx & 0x8fff) >
 85					hintsj->dx) ||
 86				    (hintsi->dy <
 87					hintsj->dy + (hintsj->cy & 0x8fff) &&
 88				     hintsi->dy + (hintsi->cy & 0x8fff) >
 89					hintsj->dy))
 90					valid = false;
 91			}
 92		}
 93	}
 94	if (!valid)
 95		for (i = 0; i < vbox->num_crtcs; ++i) {
 96			if (vbox->last_mode_hints[i].enabled) {
 97				vbox->last_mode_hints[i].dx = currentx;
 98				vbox->last_mode_hints[i].dy = 0;
 99				currentx +=
100				    vbox->last_mode_hints[i].cx & 0x8fff;
101			}
102		}
103}
104
105/* Query the host for the most recent video mode hints. */
106static void vbox_update_mode_hints(struct vbox_private *vbox)
107{
108	struct drm_connector_list_iter conn_iter;
109	struct drm_device *dev = &vbox->ddev;
110	struct drm_connector *connector;
111	struct vbox_connector *vbox_conn;
112	struct vbva_modehint *hints;
113	u16 flags;
114	bool disconnected;
115	unsigned int crtc_id;
116	int ret;
117
118	ret = hgsmi_get_mode_hints(vbox->guest_pool, vbox->num_crtcs,
119				   vbox->last_mode_hints);
120	if (ret) {
121		DRM_ERROR("vboxvideo: hgsmi_get_mode_hints failed: %d\n", ret);
122		return;
123	}
124
125	validate_or_set_position_hints(vbox);
126
127	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
128	drm_connector_list_iter_begin(dev, &conn_iter);
129	drm_for_each_connector_iter(connector, &conn_iter) {
130		vbox_conn = to_vbox_connector(connector);
131
132		hints = &vbox->last_mode_hints[vbox_conn->vbox_crtc->crtc_id];
133		if (hints->magic != VBVAMODEHINT_MAGIC)
134			continue;
135
136		disconnected = !(hints->enabled);
137		crtc_id = vbox_conn->vbox_crtc->crtc_id;
138		vbox_conn->mode_hint.width = hints->cx;
139		vbox_conn->mode_hint.height = hints->cy;
140		vbox_conn->vbox_crtc->x_hint = hints->dx;
141		vbox_conn->vbox_crtc->y_hint = hints->dy;
142		vbox_conn->mode_hint.disconnected = disconnected;
143
144		if (vbox_conn->vbox_crtc->disconnected == disconnected)
145			continue;
146
147		if (disconnected)
148			flags = VBVA_SCREEN_F_ACTIVE | VBVA_SCREEN_F_DISABLED;
149		else
150			flags = VBVA_SCREEN_F_ACTIVE | VBVA_SCREEN_F_BLANK;
151
152		hgsmi_process_display_info(vbox->guest_pool, crtc_id, 0, 0, 0,
153					   hints->cx * 4, hints->cx,
154					   hints->cy, 0, flags);
155
156		vbox_conn->vbox_crtc->disconnected = disconnected;
157	}
158	drm_connector_list_iter_end(&conn_iter);
159	drm_modeset_unlock(&dev->mode_config.connection_mutex);
160}
161
162static void vbox_hotplug_worker(struct work_struct *work)
163{
164	struct vbox_private *vbox = container_of(work, struct vbox_private,
165						 hotplug_work);
166
167	vbox_update_mode_hints(vbox);
168	drm_kms_helper_hotplug_event(&vbox->ddev);
169}
170
171int vbox_irq_init(struct vbox_private *vbox)
172{
173	INIT_WORK(&vbox->hotplug_work, vbox_hotplug_worker);
174	vbox_update_mode_hints(vbox);
175
176	return drm_irq_install(&vbox->ddev, vbox->ddev.pdev->irq);
177}
178
179void vbox_irq_fini(struct vbox_private *vbox)
180{
181	drm_irq_uninstall(&vbox->ddev);
182	flush_work(&vbox->hotplug_work);
183}