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
vbox_clear_irq(void)20 static void vbox_clear_irq(void)
21 {
22 outl((u32)~0, VGA_PORT_HGSMI_HOST);
23 }
24
vbox_get_flags(struct vbox_private * vbox)25 static u32 vbox_get_flags(struct vbox_private *vbox)
26 {
27 return readl(vbox->guest_heap + HOST_FLAGS_OFFSET);
28 }
29
vbox_report_hotplug(struct vbox_private * vbox)30 void vbox_report_hotplug(struct vbox_private *vbox)
31 {
32 schedule_work(&vbox->hotplug_work);
33 }
34
vbox_irq_handler(int irq,void * arg)35 static 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 */
validate_or_set_position_hints(struct vbox_private * vbox)66 static 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. */
vbox_update_mode_hints(struct vbox_private * vbox)107 static 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
vbox_hotplug_worker(struct work_struct * work)163 static 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
vbox_irq_init(struct vbox_private * vbox)172 int 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
vbox_irq_fini(struct vbox_private * vbox)184 void 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