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 19 static void vbox_clear_irq(void) 20 { 21 outl((u32)~0, VGA_PORT_HGSMI_HOST); 22 } 23 24 static u32 vbox_get_flags(struct vbox_private *vbox) 25 { 26 return readl(vbox->guest_heap + HOST_FLAGS_OFFSET); 27 } 28 29 void vbox_report_hotplug(struct vbox_private *vbox) 30 { 31 schedule_work(&vbox->hotplug_work); 32 } 33 34 irqreturn_t vbox_irq_handler(int irq, void *arg) 35 { 36 struct drm_device *dev = (struct drm_device *)arg; 37 struct vbox_private *vbox = to_vbox_dev(dev); 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 */ 65 static 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. */ 106 static 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 } 161 162 static 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 } 170 171 int 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 } 178 179 void vbox_irq_fini(struct vbox_private *vbox) 180 { 181 drm_irq_uninstall(&vbox->ddev); 182 flush_work(&vbox->hotplug_work); 183 } 184