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
14#include <drm/drm_drv.h>
15#include <drm/drm_probe_helper.h>
16
17#include "vbox_drv.h"
18#include "vboxvideo.h"
19
20static void vbox_clear_irq(void)
21{
22	outl((u32)~0, VGA_PORT_HGSMI_HOST);
23}
24
25static u32 vbox_get_flags(struct vbox_private *vbox)
26{
27	return readl(vbox->guest_heap + HOST_FLAGS_OFFSET);
28}
29
30void vbox_report_hotplug(struct vbox_private *vbox)
31{
32	schedule_work(&vbox->hotplug_work);
33}
34
35static irqreturn_t vbox_irq_handler(int irq, void *arg)
36{
37	struct drm_device *dev = (struct drm_device *)arg;
38	struct vbox_private *vbox = to_vbox_dev(dev);
39	u32 host_flags = vbox_get_flags(vbox);
40
41	if (!(host_flags & HGSMIHOSTFLAGS_IRQ))
42		return IRQ_NONE;
43
44	/*
45	 * Due to a bug in the initial host implementation of hot-plug irqs,
46	 * the hot-plug and cursor capability flags were never cleared.
47	 * Fortunately we can tell when they would have been set by checking
48	 * that the VSYNC flag is not set.
49	 */
50	if (host_flags &
51	    (HGSMIHOSTFLAGS_HOTPLUG | HGSMIHOSTFLAGS_CURSOR_CAPABILITIES) &&
52	    !(host_flags & HGSMIHOSTFLAGS_VSYNC))
53		vbox_report_hotplug(vbox);
54
55	vbox_clear_irq();
56
57	return IRQ_HANDLED;
58}
59
60/*
61 * Check that the position hints provided by the host are suitable for GNOME
62 * shell (i.e. all screens disjoint and hints for all enabled screens) and if
63 * not replace them with default ones.  Providing valid hints improves the
64 * chances that we will get a known screen layout for pointer mapping.
65 */
66static void validate_or_set_position_hints(struct vbox_private *vbox)
67{
68	struct vbva_modehint *hintsi, *hintsj;
69	bool valid = true;
70	u16 currentx = 0;
71	int i, j;
72
73	for (i = 0; i < vbox->num_crtcs; ++i) {
74		for (j = 0; j < i; ++j) {
75			hintsi = &vbox->last_mode_hints[i];
76			hintsj = &vbox->last_mode_hints[j];
77
78			if (hintsi->enabled && hintsj->enabled) {
79				if (hintsi->dx >= 0xffff ||
80				    hintsi->dy >= 0xffff ||
81				    hintsj->dx >= 0xffff ||
82				    hintsj->dy >= 0xffff ||
83				    (hintsi->dx <
84					hintsj->dx + (hintsj->cx & 0x8fff) &&
85				     hintsi->dx + (hintsi->cx & 0x8fff) >
86					hintsj->dx) ||
87				    (hintsi->dy <
88					hintsj->dy + (hintsj->cy & 0x8fff) &&
89				     hintsi->dy + (hintsi->cy & 0x8fff) >
90					hintsj->dy))
91					valid = false;
92			}
93		}
94	}
95	if (!valid)
96		for (i = 0; i < vbox->num_crtcs; ++i) {
97			if (vbox->last_mode_hints[i].enabled) {
98				vbox->last_mode_hints[i].dx = currentx;
99				vbox->last_mode_hints[i].dy = 0;
100				currentx +=
101				    vbox->last_mode_hints[i].cx & 0x8fff;
102			}
103		}
104}
105
106/* Query the host for the most recent video mode hints. */
107static void vbox_update_mode_hints(struct vbox_private *vbox)
108{
109	struct drm_connector_list_iter conn_iter;
110	struct drm_device *dev = &vbox->ddev;
111	struct drm_connector *connector;
112	struct vbox_connector *vbox_conn;
113	struct vbva_modehint *hints;
114	u16 flags;
115	bool disconnected;
116	unsigned int crtc_id;
117	int ret;
118
119	ret = hgsmi_get_mode_hints(vbox->guest_pool, vbox->num_crtcs,
120				   vbox->last_mode_hints);
121	if (ret) {
122		DRM_ERROR("vboxvideo: hgsmi_get_mode_hints failed: %d\n", ret);
123		return;
124	}
125
126	validate_or_set_position_hints(vbox);
127
128	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
129	drm_connector_list_iter_begin(dev, &conn_iter);
130	drm_for_each_connector_iter(connector, &conn_iter) {
131		vbox_conn = to_vbox_connector(connector);
132
133		hints = &vbox->last_mode_hints[vbox_conn->vbox_crtc->crtc_id];
134		if (hints->magic != VBVAMODEHINT_MAGIC)
135			continue;
136
137		disconnected = !(hints->enabled);
138		crtc_id = vbox_conn->vbox_crtc->crtc_id;
139		vbox_conn->mode_hint.width = hints->cx;
140		vbox_conn->mode_hint.height = hints->cy;
141		vbox_conn->vbox_crtc->x_hint = hints->dx;
142		vbox_conn->vbox_crtc->y_hint = hints->dy;
143		vbox_conn->mode_hint.disconnected = disconnected;
144
145		if (vbox_conn->vbox_crtc->disconnected == disconnected)
146			continue;
147
148		if (disconnected)
149			flags = VBVA_SCREEN_F_ACTIVE | VBVA_SCREEN_F_DISABLED;
150		else
151			flags = VBVA_SCREEN_F_ACTIVE | VBVA_SCREEN_F_BLANK;
152
153		hgsmi_process_display_info(vbox->guest_pool, crtc_id, 0, 0, 0,
154					   hints->cx * 4, hints->cx,
155					   hints->cy, 0, flags);
156
157		vbox_conn->vbox_crtc->disconnected = disconnected;
158	}
159	drm_connector_list_iter_end(&conn_iter);
160	drm_modeset_unlock(&dev->mode_config.connection_mutex);
161}
162
163static void vbox_hotplug_worker(struct work_struct *work)
164{
165	struct vbox_private *vbox = container_of(work, struct vbox_private,
166						 hotplug_work);
167
168	vbox_update_mode_hints(vbox);
169	drm_kms_helper_hotplug_event(&vbox->ddev);
170}
171
172int vbox_irq_init(struct vbox_private *vbox)
173{
174	struct drm_device *dev = &vbox->ddev;
175	struct pci_dev *pdev = to_pci_dev(dev->dev);
176
177	INIT_WORK(&vbox->hotplug_work, vbox_hotplug_worker);
178	vbox_update_mode_hints(vbox);
179
180	/* PCI devices require shared interrupts. */
181	return request_irq(pdev->irq, vbox_irq_handler, IRQF_SHARED, dev->driver->name, dev);
182}
183
184void vbox_irq_fini(struct vbox_private *vbox)
185{
186	struct drm_device *dev = &vbox->ddev;
187	struct pci_dev *pdev = to_pci_dev(dev->dev);
188
189	free_irq(pdev->irq, dev);
190	flush_work(&vbox->hotplug_work);
191}
192