1 | /* $Id: display-svga.cpp 67759 2017-07-03 14:07:23Z vboxsync $ */
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2 | /** @file
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3 | * X11 guest client - VMSVGA emulation resize event pass-through to guest
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4 | * driver.
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5 | */
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6 |
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7 | /*
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8 | * Copyright (C) 2016 Oracle Corporation
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9 | *
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10 | * This file is part of VirtualBox Open Source Edition (OSE), as
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11 | * available from http://www.virtualbox.org. This file is free software;
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12 | * you can redistribute it and/or modify it under the terms of the GNU
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13 | * General Public License (GPL) as published by the Free Software
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14 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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15 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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16 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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17 | */
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18 |
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19 | /*
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20 | * Known things to test when changing this code. All assume a guest with VMSVGA
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21 | * active and controlled by X11 or Wayland, and Guest Additions installed and
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22 | * running, unless otherwise stated.
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23 | * - On Linux 4.6 and later guests, VBoxClient --vmsvga should be running as
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24 | * root and not as the logged-in user. Dynamic resizing should work for all
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25 | * screens in any environment which handles kernel resize notifications,
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26 | * including at log-in screens. Test GNOME Shell Wayland and GNOME Shell
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27 | * under X.Org or Unity or KDE at the log-in screen and after log-in.
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28 | * - Linux 4.10 changed the user-kernel-ABI introduced in 4.6: test both.
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29 | * - On other guests (than Linux 4.6 or later) running X.Org Server 1.3 or
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30 | * later, VBoxClient --vmsvga should never be running as root, and should run
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31 | * (and dynamic resizing and screen enable/disable should work for all
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32 | * screens) whenever a user is logged in to a supported desktop environment.
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33 | * - On guests running X.Org Server 1.2 or older, VBoxClient --vmsvga should
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34 | * never run as root and should run whenever a user is logged in to a
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35 | * supported desktop environment. Dynamic resizing should work for the first
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36 | * screen, and enabling others should not be possible.
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37 | * - When VMSVGA is not enabled, VBoxClient --vmsvga should never stay running.
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38 | */
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39 |
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40 | #include "VBoxClient.h"
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41 |
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42 | #include <VBox/VBoxGuestLib.h>
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43 |
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44 | #include <iprt/assert.h>
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45 | #include <iprt/file.h>
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46 | #include <iprt/string.h>
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47 |
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48 | /** Maximum number of supported screens. DRM and X11 both limit this to 32. */
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49 | #define VMW_MAX_HEADS 32
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50 |
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51 | /* VMWare kernel driver control parts definitions. */
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52 |
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53 | #ifdef RT_OS_LINUX
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54 | # include <sys/ioctl.h>
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55 | #else /* Solaris and BSDs, in case they ever adopt the DRM driver. */
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56 | # include <sys/ioccom.h>
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57 | #endif
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58 |
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59 | #define DRM_DRIVER_NAME "vmwgfx"
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60 |
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61 | /** DRM version structure. */
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62 | struct DRMVERSION
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63 | {
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64 | int cMajor;
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65 | int cMinor;
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66 | int cPatchLevel;
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67 | size_t cbName;
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68 | char *pszName;
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69 | size_t cbDate;
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70 | char *pszDate;
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71 | size_t cbDescription;
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72 | char *pszDescription;
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73 | };
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74 | AssertCompileSize(struct DRMVERSION, 8 + 7 * sizeof(void *));
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75 |
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76 | /** Rectangle structure for geometry of a single screen. */
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77 | struct DRMVMWRECT
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78 | {
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79 | int32_t x;
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80 | int32_t y;
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81 | uint32_t w;
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82 | uint32_t h;
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83 | };
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84 | AssertCompileSize(struct DRMVMWRECT, 16);
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85 |
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86 | #define DRM_IOCTL_VERSION _IOWR('d', 0x00, struct DRMVERSION)
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87 |
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88 | struct DRMCONTEXT
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89 | {
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90 | RTFILE hDevice;
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91 | };
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92 |
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93 | static void drmConnect(struct DRMCONTEXT *pContext)
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94 | {
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95 | unsigned i;
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96 | RTFILE hDevice;
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97 |
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98 | if (pContext->hDevice != NIL_RTFILE)
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99 | VBClFatalError(("%s called with bad argument\n", __func__));
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100 | /* Try to open the SVGA DRM device. */
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101 | for (i = 0; i < 128; ++i)
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102 | {
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103 | char szPath[64];
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104 | struct DRMVERSION version;
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105 | char szName[sizeof(DRM_DRIVER_NAME)];
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106 | int rc;
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107 |
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108 | /* Control devices for drm graphics driver control devices go from
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109 | * controlD64 to controlD127. Render node devices go from renderD128
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110 | * to renderD192. The driver takes resize hints via the control device
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111 | * on pre-4.10 kernels and on the render device on newer ones. Try
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112 | * both types. */
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113 | if (i % 2 == 0)
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114 | rc = RTStrPrintf(szPath, sizeof(szPath), "/dev/dri/renderD%u", i / 2 + 128);
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115 | else
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116 | rc = RTStrPrintf(szPath, sizeof(szPath), "/dev/dri/controlD%u", i / 2 + 64);
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117 | if (RT_FAILURE(rc))
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118 | VBClFatalError(("RTStrPrintf of device path failed, rc=%Rrc\n", rc));
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119 | rc = RTFileOpen(&hDevice, szPath, RTFILE_O_READWRITE | RTFILE_O_OPEN | RTFILE_O_DENY_NONE);
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120 | if (RT_FAILURE(rc))
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121 | continue;
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122 | RT_ZERO(version);
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123 | version.cbName = sizeof(szName);
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124 | version.pszName = szName;
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125 | rc = RTFileIoCtl(hDevice, DRM_IOCTL_VERSION, &version, sizeof(version), NULL);
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126 | if ( RT_SUCCESS(rc)
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127 | && !strncmp(szName, DRM_DRIVER_NAME, sizeof(DRM_DRIVER_NAME) - 1)
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128 | && ( version.cMajor > 2
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129 | || (version.cMajor == 2 && version.cMinor > 9)))
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130 | break;
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131 | hDevice = NIL_RTFILE;
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132 | }
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133 | pContext->hDevice = hDevice;
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134 | }
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135 |
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136 | /** Preferred screen layout information for DRM_VMW_UPDATE_LAYOUT IoCtl. The
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137 | * rects argument is a cast pointer to an array of drm_vmw_rect. */
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138 | struct DRMVMWUPDATELAYOUT {
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139 | uint32_t cOutputs;
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140 | uint32_t u32Pad;
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141 | uint64_t ptrRects;
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142 | };
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143 | AssertCompileSize(struct DRMVMWUPDATELAYOUT, 16);
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144 |
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145 | #define DRM_IOCTL_VMW_UPDATE_LAYOUT \
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146 | _IOW('d', 0x40 + 20, struct DRMVMWUPDATELAYOUT)
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147 |
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148 | static void drmSendHints(struct DRMCONTEXT *pContext, struct DRMVMWRECT *paRects,
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149 | unsigned cHeads)
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150 | {
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151 | int rc;
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152 | struct DRMVMWUPDATELAYOUT ioctlLayout;
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153 |
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154 | if (pContext->hDevice == NIL_RTFILE)
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155 | VBClFatalError(("%s bad device argument.\n", __func__));
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156 | ioctlLayout.cOutputs = cHeads;
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157 | ioctlLayout.ptrRects = (uint64_t)paRects;
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158 | rc = RTFileIoCtl(pContext->hDevice, DRM_IOCTL_VMW_UPDATE_LAYOUT,
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159 | &ioctlLayout, sizeof(ioctlLayout), NULL);
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160 | if (RT_FAILURE(rc) && rc != VERR_INVALID_PARAMETER)
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161 | VBClFatalError(("Failure updating layout, rc=%Rrc\n", rc));
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162 | }
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163 |
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164 | /* VMWare X.Org driver control parts definitions. */
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165 |
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166 | #include <X11/Xlibint.h>
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167 |
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168 | struct X11CONTEXT
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169 | {
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170 | Display *pDisplay;
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171 | int hRandRMajor;
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172 | int hVMWMajor;
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173 | };
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174 |
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175 | static void x11Connect(struct X11CONTEXT *pContext)
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176 | {
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177 | int dummy;
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178 |
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179 | if (pContext->pDisplay != NULL)
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180 | VBClFatalError(("%s called with bad argument\n", __func__));
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181 | pContext->pDisplay = XOpenDisplay(NULL);
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182 | if (pContext->pDisplay == NULL)
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183 | return;
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184 | if ( !XQueryExtension(pContext->pDisplay, "RANDR",
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185 | &pContext->hRandRMajor, &dummy, &dummy)
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186 | || !XQueryExtension(pContext->pDisplay, "VMWARE_CTRL",
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187 | &pContext->hVMWMajor, &dummy, &dummy))
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188 | {
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189 | XCloseDisplay(pContext->pDisplay);
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190 | pContext->pDisplay = NULL;
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191 | }
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192 | }
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193 |
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194 | #define X11_VMW_TOPOLOGY_REQ 2
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195 | struct X11VMWRECT /* xXineramaScreenInfo in Xlib headers. */
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196 | {
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197 | int16_t x;
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198 | int16_t y;
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199 | uint16_t w;
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200 | uint16_t h;
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201 | };
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202 | AssertCompileSize(struct X11VMWRECT, 8);
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203 |
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204 | struct X11REQHEADER
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205 | {
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206 | uint8_t hMajor;
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207 | uint8_t idType;
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208 | uint16_t cd;
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209 | };
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210 |
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211 | struct X11VMWTOPOLOGYREQ
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212 | {
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213 | struct X11REQHEADER header;
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214 | uint32_t idX11Screen;
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215 | uint32_t cScreens;
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216 | uint32_t u32Pad;
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217 | struct X11VMWRECT aRects[1];
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218 | };
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219 | AssertCompileSize(struct X11VMWTOPOLOGYREQ, 24);
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220 |
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221 | #define X11_VMW_TOPOLOGY_REPLY_SIZE 32
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222 |
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223 | #define X11_VMW_RESOLUTION_REQUEST 1
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224 | struct X11VMWRESOLUTIONREQ
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225 | {
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226 | struct X11REQHEADER header;
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227 | uint32_t idX11Screen;
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228 | uint32_t x;
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229 | uint32_t y;
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230 | };
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231 | AssertCompileSize(struct X11VMWRESOLUTIONREQ, 16);
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232 |
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233 | #define X11_VMW_RESOLUTION_REPLY_SIZE 32
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234 |
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235 | #define X11_RANDR_GET_SCREEN_REQUEST 5
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236 | struct X11RANDRGETSCREENREQ
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237 | {
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238 | struct X11REQHEADER header;
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239 | uint32_t hWindow;
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240 | };
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241 | AssertCompileSize(struct X11RANDRGETSCREENREQ, 8);
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242 |
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243 | #define X11_RANDR_GET_SCREEN_REPLY_SIZE 32
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244 |
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245 | /* This was a macro in old Xlib versions and a function in newer ones; the
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246 | * display members touched by the macro were declared as ABI for compatibility
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247 | * reasons. To simplify building with different generations, we duplicate the
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248 | * code. */
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249 | static void x11GetRequest(struct X11CONTEXT *pContext, uint8_t hMajor,
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250 | uint8_t idType, size_t cb, struct X11REQHEADER **ppReq)
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251 | {
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252 | if (pContext->pDisplay->bufptr + cb > pContext->pDisplay->bufmax)
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253 | _XFlush(pContext->pDisplay);
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254 | if (pContext->pDisplay->bufptr + cb > pContext->pDisplay->bufmax)
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255 | VBClFatalError(("%s display buffer overflow.\n", __func__));
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256 | if (cb % 4 != 0)
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257 | VBClFatalError(("%s bad parameter.\n", __func__));
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258 | pContext->pDisplay->last_req = pContext->pDisplay->bufptr;
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259 | *ppReq = (struct X11REQHEADER *)pContext->pDisplay->bufptr;
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260 | (*ppReq)->hMajor = hMajor;
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261 | (*ppReq)->idType = idType;
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262 | (*ppReq)->cd = cb / 4;
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263 | pContext->pDisplay->bufptr += cb;
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264 | pContext->pDisplay->request++;
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265 | }
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266 |
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267 | static void x11SendHints(struct X11CONTEXT *pContext, struct DRMVMWRECT *pRects,
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268 | unsigned cRects)
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269 | {
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270 | unsigned i;
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271 | struct X11VMWTOPOLOGYREQ *pReqTopology;
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272 | uint8_t repTopology[X11_VMW_TOPOLOGY_REPLY_SIZE];
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273 | struct X11VMWRESOLUTIONREQ *pReqResolution;
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274 | uint8_t repResolution[X11_VMW_RESOLUTION_REPLY_SIZE];
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275 |
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276 | if (!VALID_PTR(pContext->pDisplay))
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277 | VBClFatalError(("%s bad display argument.\n", __func__));
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278 | if (cRects == 0)
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279 | return;
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280 | /* Try a topology (multiple screen) request. */
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281 | x11GetRequest(pContext, pContext->hVMWMajor, X11_VMW_TOPOLOGY_REQ,
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282 | sizeof(struct X11VMWTOPOLOGYREQ)
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283 | + sizeof(struct X11VMWRECT) * (cRects - 1),
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284 | (struct X11REQHEADER **)&pReqTopology);
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285 | pReqTopology->idX11Screen = DefaultScreen(pContext->pDisplay);
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286 | pReqTopology->cScreens = cRects;
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287 | for (i = 0; i < cRects; ++i)
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288 | {
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289 | pReqTopology->aRects[i].x = pRects[i].x;
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290 | pReqTopology->aRects[i].y = pRects[i].y;
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291 | pReqTopology->aRects[i].w = pRects[i].w;
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292 | pReqTopology->aRects[i].h = pRects[i].h;
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293 | }
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294 | _XSend(pContext->pDisplay, NULL, 0);
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295 | if (_XReply(pContext->pDisplay, (xReply *)&repTopology, 0, xTrue))
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296 | return;
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297 | /* That failed, so try the old single screen set resolution. We prefer
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298 | * simpler code to negligeably improved efficiency, so we just always try
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299 | * both requests instead of doing version checks or caching. */
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300 | x11GetRequest(pContext, pContext->hVMWMajor, X11_VMW_RESOLUTION_REQUEST,
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301 | sizeof(struct X11VMWTOPOLOGYREQ),
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302 | (struct X11REQHEADER **)&pReqResolution);
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303 | pReqResolution->idX11Screen = DefaultScreen(pContext->pDisplay);
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304 | pReqResolution->x = pRects[0].x;
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305 | pReqResolution->y = pRects[0].y;
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306 | if (_XReply(pContext->pDisplay, (xReply *)&repResolution, 0, xTrue))
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307 | return;
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308 | /* What now? */
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309 | VBClFatalError(("%s failed to set resolution\n", __func__));
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310 | }
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311 |
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312 | /** Call RRGetScreenInfo to wake up the server to the new modes. */
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313 | static void x11GetScreenInfo(struct X11CONTEXT *pContext)
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314 | {
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315 | struct X11RANDRGETSCREENREQ *pReqGetScreen;
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316 | uint8_t repGetScreen[X11_RANDR_GET_SCREEN_REPLY_SIZE];
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317 |
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318 | if (!VALID_PTR(pContext->pDisplay))
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319 | VBClFatalError(("%s bad display argument.\n", __func__));
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320 | x11GetRequest(pContext, pContext->hRandRMajor, X11_RANDR_GET_SCREEN_REQUEST,
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321 | sizeof(struct X11RANDRGETSCREENREQ),
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322 | (struct X11REQHEADER **)&pReqGetScreen);
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323 | pReqGetScreen->hWindow = DefaultRootWindow(pContext->pDisplay);
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324 | _XSend(pContext->pDisplay, NULL, 0);
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325 | if (!_XReply(pContext->pDisplay, (xReply *)&repGetScreen, 0, xTrue))
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326 | VBClFatalError(("%s failed to set resolution\n", __func__));
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327 | }
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328 |
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329 | static const char *getPidFilePath()
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330 | {
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331 | return ".vboxclient-display-svga.pid";
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332 | }
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333 |
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334 | static int run(struct VBCLSERVICE **ppInterface, bool fDaemonised)
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335 | {
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336 | (void)ppInterface;
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337 | (void)fDaemonised;
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338 | struct DRMCONTEXT drmContext = { NIL_RTFILE };
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339 | struct X11CONTEXT x11Context = { NULL };
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340 | unsigned i;
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341 | int rc;
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342 | uint32_t acx[VMW_MAX_HEADS] = { 0 };
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343 | uint32_t acy[VMW_MAX_HEADS] = { 0 };
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344 | uint32_t adx[VMW_MAX_HEADS] = { 0 };
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345 | uint32_t ady[VMW_MAX_HEADS] = { 0 };
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346 | uint32_t afEnabled[VMW_MAX_HEADS] = { false };
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347 | struct DRMVMWRECT aRects[VMW_MAX_HEADS];
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348 | unsigned cHeads;
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349 |
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350 | drmConnect(&drmContext);
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351 | if (drmContext.hDevice == NIL_RTFILE)
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352 | {
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353 | x11Connect(&x11Context);
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354 | if (x11Context.pDisplay == NULL)
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355 | return VINF_SUCCESS;
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356 | }
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357 | /* Initialise the guest library. */
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358 | rc = VbglR3InitUser();
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359 | if (RT_FAILURE(rc))
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360 | VBClFatalError(("Failed to connect to the VirtualBox kernel service, rc=%Rrc\n", rc));
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361 | rc = VbglR3CtlFilterMask(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, 0);
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362 | if (RT_FAILURE(rc))
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363 | VBClFatalError(("Failed to request display change events, rc=%Rrc\n", rc));
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364 | rc = VbglR3AcquireGuestCaps(VMMDEV_GUEST_SUPPORTS_GRAPHICS, 0, false);
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365 | if (rc == VERR_RESOURCE_BUSY) /* Someone else has already acquired it. */
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366 | return VINF_SUCCESS;
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367 | if (RT_FAILURE(rc))
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368 | VBClFatalError(("Failed to register resizing support, rc=%Rrc\n", rc));
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369 | for (;;)
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370 | {
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371 | uint32_t events;
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372 |
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373 | rc = VbglR3WaitEvent(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, RT_INDEFINITE_WAIT, &events);
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374 | if (RT_FAILURE(rc))
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375 | VBClFatalError(("Failure waiting for event, rc=%Rrc\n", rc));
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376 | while (rc != VERR_TIMEOUT)
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377 | {
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378 | uint32_t cx, cy, cBits, dx, dy, idx;
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379 | bool fEnabled, fChangeOrigin;
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380 |
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381 | rc = VbglR3GetDisplayChangeRequest(&cx, &cy, &cBits, &idx, &dx, &dy, &fEnabled, &fChangeOrigin, true);
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382 | if (RT_FAILURE(rc))
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383 | VBClFatalError(("Failed to get display change request, rc=%Rrc\n", rc));
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384 | if (idx < VMW_MAX_HEADS)
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385 | {
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386 | acx[idx] = cx;
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387 | acy[idx] = cy;
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388 | if (fChangeOrigin)
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389 | adx[idx] = dx < INT32_MAX ? dx : 0;
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390 | if (fChangeOrigin)
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391 | ady[idx] = dy < INT32_MAX ? dy : 0;
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392 | afEnabled[idx] = fEnabled;
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393 | }
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394 | rc = VbglR3WaitEvent(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, 0, &events);
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395 | if (RT_FAILURE(rc) && rc != VERR_TIMEOUT)
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396 | VBClFatalError(("Failure waiting for event, rc=%Rrc\n", rc));
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397 | }
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398 | for (i = 0, cHeads = 0; i < VMW_MAX_HEADS; ++i)
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399 | {
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400 | if (afEnabled[i])
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401 | {
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402 | aRects[cHeads].x = (int32_t)adx[i];
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403 | aRects[cHeads].y = (int32_t)ady[i];
|
---|
404 | aRects[cHeads].w = acx[i];
|
---|
405 | aRects[cHeads].h = acy[i];
|
---|
406 | ++cHeads;
|
---|
407 | }
|
---|
408 | }
|
---|
409 | if (drmContext.hDevice != NIL_RTFILE)
|
---|
410 | drmSendHints(&drmContext, aRects, cHeads);
|
---|
411 | else
|
---|
412 | {
|
---|
413 | x11SendHints(&x11Context, aRects, cHeads);
|
---|
414 | x11GetScreenInfo(&x11Context);
|
---|
415 | }
|
---|
416 | }
|
---|
417 | }
|
---|
418 |
|
---|
419 | struct VBCLSERVICE interface =
|
---|
420 | {
|
---|
421 | getPidFilePath,
|
---|
422 | VBClServiceDefaultHandler, /* Init */
|
---|
423 | run,
|
---|
424 | VBClServiceDefaultCleanup
|
---|
425 | }, *pInterface = &interface;
|
---|
426 |
|
---|
427 | struct VBCLSERVICE **VBClDisplaySVGAService()
|
---|
428 | {
|
---|
429 | return &pInterface;
|
---|
430 | }
|
---|