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 20 static void vbox_clear_irq(void) 21 { 22 outl((u32)~0, VGA_PORT_HGSMI_HOST); 23 } 24 25 static u32 vbox_get_flags(struct vbox_private *vbox) 26 { 27 return readl(vbox->guest_heap + HOST_FLAGS_OFFSET); 28 } 29 30 void vbox_report_hotplug(struct vbox_private *vbox) 31 { 32 schedule_work(&vbox->hotplug_work); 33 } 34 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 */ 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. */ 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 } 162 163 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 } 171 172 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 } 183 184 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