| 1 | /* $Id: display-drm.cpp 86318 2020-09-28 12:33:34Z vboxsync $ */
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| 2 | /** @file
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| 3 | * X11 guest client - VMSVGA emulation resize event pass-through to drm 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) 2016-2020 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/err.h>
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| 47 | #include <iprt/string.h>
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| 48 | #include <iprt/initterm.h>
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| 49 | #include <iprt/message.h>
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| 50 | #include <unistd.h>
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| 51 | #include <stdio.h>
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| 52 |
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| 53 |
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| 54 | /** Maximum number of supported screens. DRM and X11 both limit this to 32. */
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| 55 | /** @todo if this ever changes, dynamically allocate resizeable arrays in the
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| 56 | * context structure. */
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| 57 | #define VMW_MAX_HEADS 32
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| 58 |
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| 59 | /* VMWare kernel driver control parts definitions. */
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| 60 |
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| 61 | #ifdef RT_OS_LINUX
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| 62 | # include <sys/ioctl.h>
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| 63 | #else /* Solaris and BSDs, in case they ever adopt the DRM driver. */
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| 64 | # include <sys/ioccom.h>
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| 65 | #endif
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| 66 |
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| 67 | #define DRM_DRIVER_NAME "vmwgfx"
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| 68 |
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| 69 | /** Counter of how often our daemon has been respawned. */
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| 70 | unsigned g_cRespawn = 0;
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| 71 | /** Logging verbosity level. */
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| 72 | unsigned g_cVerbosity = 0;
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| 73 |
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| 74 | /** DRM version structure. */
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| 75 | struct DRMVERSION
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| 76 | {
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| 77 | int cMajor;
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| 78 | int cMinor;
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| 79 | int cPatchLevel;
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| 80 | size_t cbName;
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| 81 | char *pszName;
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| 82 | size_t cbDate;
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| 83 | char *pszDate;
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| 84 | size_t cbDescription;
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| 85 | char *pszDescription;
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| 86 | };
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| 87 | AssertCompileSize(struct DRMVERSION, 8 + 7 * sizeof(void *));
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| 88 |
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| 89 | /** Rectangle structure for geometry of a single screen. */
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| 90 | struct DRMVMWRECT
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| 91 | {
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| 92 | int32_t x;
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| 93 | int32_t y;
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| 94 | uint32_t w;
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| 95 | uint32_t h;
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| 96 | };
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| 97 | AssertCompileSize(struct DRMVMWRECT, 16);
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| 98 |
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| 99 | #define DRM_IOCTL_VERSION _IOWR('d', 0x00, struct DRMVERSION)
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| 100 |
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| 101 | struct DRMCONTEXT
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| 102 | {
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| 103 | RTFILE hDevice;
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| 104 | };
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| 105 |
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| 106 | static void drmConnect(struct DRMCONTEXT *pContext)
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| 107 | {
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| 108 | unsigned i;
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| 109 | RTFILE hDevice;
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| 110 |
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| 111 | if (pContext->hDevice != NIL_RTFILE)
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| 112 | VBClLogFatalError("%s called with bad argument\n", __func__);
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| 113 | /* Try to open the SVGA DRM device. */
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| 114 | for (i = 0; i < 128; ++i)
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| 115 | {
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| 116 | char szPath[64];
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| 117 | struct DRMVERSION version;
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| 118 | char szName[sizeof(DRM_DRIVER_NAME)];
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| 119 | int rc;
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| 120 |
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| 121 | /* Control devices for drm graphics driver control devices go from
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| 122 | * controlD64 to controlD127. Render node devices go from renderD128
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| 123 | * to renderD192. The driver takes resize hints via the control device
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| 124 | * on pre-4.10 kernels and on the render device on newer ones. Try
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| 125 | * both types. */
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| 126 | if (i % 2 == 0)
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| 127 | rc = RTStrPrintf(szPath, sizeof(szPath), "/dev/dri/renderD%u", i / 2 + 128);
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| 128 | else
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| 129 | rc = RTStrPrintf(szPath, sizeof(szPath), "/dev/dri/controlD%u", i / 2 + 64);
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| 130 | if (RT_FAILURE(rc))
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| 131 | VBClLogFatalError("RTStrPrintf of device path failed, rc=%Rrc\n", rc);
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| 132 | rc = RTFileOpen(&hDevice, szPath, RTFILE_O_READWRITE | RTFILE_O_OPEN | RTFILE_O_DENY_NONE);
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| 133 | if (RT_FAILURE(rc))
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| 134 | continue;
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| 135 | RT_ZERO(version);
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| 136 | version.cbName = sizeof(szName);
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| 137 | version.pszName = szName;
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| 138 | rc = RTFileIoCtl(hDevice, DRM_IOCTL_VERSION, &version, sizeof(version), NULL);
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| 139 | if ( RT_SUCCESS(rc)
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| 140 | && !strncmp(szName, DRM_DRIVER_NAME, sizeof(DRM_DRIVER_NAME) - 1)
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| 141 | && ( version.cMajor > 2
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| 142 | || (version.cMajor == 2 && version.cMinor > 9)))
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| 143 | break;
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| 144 | hDevice = NIL_RTFILE;
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| 145 | }
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| 146 | pContext->hDevice = hDevice;
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| 147 | }
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| 148 |
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| 149 | /** Preferred screen layout information for DRM_VMW_UPDATE_LAYOUT IoCtl. The
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| 150 | * rects argument is a cast pointer to an array of drm_vmw_rect. */
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| 151 | struct DRMVMWUPDATELAYOUT {
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| 152 | uint32_t cOutputs;
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| 153 | uint32_t u32Pad;
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| 154 | uint64_t ptrRects;
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| 155 | };
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| 156 | AssertCompileSize(struct DRMVMWUPDATELAYOUT, 16);
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| 157 |
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| 158 | #define DRM_IOCTL_VMW_UPDATE_LAYOUT \
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| 159 | _IOW('d', 0x40 + 20, struct DRMVMWUPDATELAYOUT)
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| 160 |
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| 161 | static void drmSendHints(struct DRMCONTEXT *pContext, struct DRMVMWRECT *paRects,
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| 162 | unsigned cHeads)
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| 163 | {
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| 164 | uid_t curuid = getuid();
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| 165 | if (setreuid(0, 0) != 0)
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| 166 | perror("setreuid failed during drm ioctl.");
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| 167 | int rc;
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| 168 | struct DRMVMWUPDATELAYOUT ioctlLayout;
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| 169 |
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| 170 | if (pContext->hDevice == NIL_RTFILE)
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| 171 | VBClLogFatalError("%s bad device argument\n", __func__);
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| 172 | ioctlLayout.cOutputs = cHeads;
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| 173 | ioctlLayout.ptrRects = (uint64_t)paRects;
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| 174 | rc = RTFileIoCtl(pContext->hDevice, DRM_IOCTL_VMW_UPDATE_LAYOUT,
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| 175 | &ioctlLayout, sizeof(ioctlLayout), NULL);
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| 176 | if (RT_FAILURE(rc) && rc != VERR_INVALID_PARAMETER)
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| 177 | VBClLogFatalError("Failure updating layout, rc=%Rrc\n", rc);
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| 178 | if (setreuid(curuid, 0) != 0)
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| 179 | perror("reset of setreuid failed after drm ioctl.");
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| 180 | }
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| 181 |
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| 182 | int main(int argc, char *argv[])
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| 183 | {
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| 184 | int rc = RTR3InitExe(argc, &argv, 0);
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| 185 | if (RT_FAILURE(rc))
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| 186 | return RTMsgInitFailure(rc);
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| 187 | rc = VbglR3InitUser();
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| 188 | if (RT_FAILURE(rc))
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| 189 | VBClLogFatalError("VbglR3InitUser failed: %Rrc", rc);
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| 190 |
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| 191 | struct DRMCONTEXT drmContext = { NIL_RTFILE };
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| 192 | static struct VMMDevDisplayDef aMonitors[VMW_MAX_HEADS];
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| 193 |
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| 194 | unsigned cEnabledMonitors;
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| 195 | /* Do not acknowledge the first event we query for to pick up old events,
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| 196 | * e.g. from before a guest reboot. */
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| 197 | bool fAck = false;
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| 198 | drmConnect(&drmContext);
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| 199 | if (drmContext.hDevice == NIL_RTFILE)
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| 200 | return VERR_OPEN_FAILED;
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| 201 | rc = VbglR3CtlFilterMask(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, 0);
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| 202 | if (RT_FAILURE(rc))
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| 203 | {
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| 204 | VBClLogFatalError("Failed to request display change events, rc=%Rrc\n", rc);
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| 205 | return VERR_INVALID_HANDLE;
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| 206 | }
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| 207 | rc = VbglR3AcquireGuestCaps(VMMDEV_GUEST_SUPPORTS_GRAPHICS, 0, false);
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| 208 | if (rc == VERR_RESOURCE_BUSY) /* Someone else has already acquired it. */
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| 209 | {
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| 210 | return VERR_RESOURCE_BUSY;
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| 211 | }
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| 212 | if (RT_FAILURE(rc))
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| 213 | {
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| 214 | VBClLogFatalError("Failed to register resizing support, rc=%Rrc\n", rc);
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| 215 | return VERR_INVALID_HANDLE;
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| 216 | }
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| 217 |
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| 218 | for (;;)
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| 219 | {
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| 220 | uint32_t events;
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| 221 | struct VMMDevDisplayDef aDisplays[VMW_MAX_HEADS];
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| 222 | uint32_t cDisplaysOut;
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| 223 | /* Query the first size without waiting. This lets us e.g. pick up
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| 224 | * the last event before a guest reboot when we start again after. */
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| 225 | rc = VbglR3GetDisplayChangeRequestMulti(VMW_MAX_HEADS, &cDisplaysOut, aDisplays, fAck);
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| 226 | fAck = true;
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| 227 | if (RT_FAILURE(rc))
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| 228 | VBClLogFatalError("Failed to get display change request, rc=%Rrc\n", rc);
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| 229 | if (cDisplaysOut > VMW_MAX_HEADS)
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| 230 | VBClLogFatalError("Display change request contained, rc=%Rrc\n", rc);
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| 231 | if (cDisplaysOut > 0)
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| 232 | {
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| 233 | for (unsigned i = 0; i < cDisplaysOut && i < VMW_MAX_HEADS; ++i)
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| 234 | {
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| 235 | uint32_t idDisplay = aDisplays[i].idDisplay;
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| 236 | if (idDisplay >= VMW_MAX_HEADS)
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| 237 | continue;
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| 238 | aMonitors[idDisplay].fDisplayFlags = aDisplays[i].fDisplayFlags;
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| 239 | if (!(aDisplays[i].fDisplayFlags & VMMDEV_DISPLAY_DISABLED))
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| 240 | {
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| 241 | if ((idDisplay == 0) || (aDisplays[i].fDisplayFlags & VMMDEV_DISPLAY_ORIGIN))
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| 242 | {
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| 243 | aMonitors[idDisplay].xOrigin = aDisplays[i].xOrigin;
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| 244 | aMonitors[idDisplay].yOrigin = aDisplays[i].yOrigin;
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| 245 | } else {
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| 246 | aMonitors[idDisplay].xOrigin = aMonitors[idDisplay - 1].xOrigin + aMonitors[idDisplay - 1].cx;
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| 247 | aMonitors[idDisplay].yOrigin = aMonitors[idDisplay - 1].yOrigin;
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| 248 | }
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| 249 | aMonitors[idDisplay].cx = aDisplays[i].cx;
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| 250 | aMonitors[idDisplay].cy = aDisplays[i].cy;
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| 251 | }
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| 252 | }
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| 253 | /* Create an dense (consisting of enabled monitors only) array to pass to DRM. */
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| 254 | cEnabledMonitors = 0;
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| 255 | struct DRMVMWRECT aEnabledMonitors[VMW_MAX_HEADS];
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| 256 | for (int j = 0; j < VMW_MAX_HEADS; ++j)
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| 257 | {
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| 258 | if (!(aMonitors[j].fDisplayFlags & VMMDEV_DISPLAY_DISABLED))
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| 259 | {
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| 260 | aEnabledMonitors[cEnabledMonitors].x = aMonitors[j].xOrigin;
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| 261 | aEnabledMonitors[cEnabledMonitors].y = aMonitors[j].yOrigin;
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| 262 | aEnabledMonitors[cEnabledMonitors].w = aMonitors[j].cx;
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| 263 | aEnabledMonitors[cEnabledMonitors].h = aMonitors[j].cy;
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| 264 | if (cEnabledMonitors > 0)
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| 265 | aEnabledMonitors[cEnabledMonitors].x = aEnabledMonitors[cEnabledMonitors - 1].x + aEnabledMonitors[cEnabledMonitors - 1].w;
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| 266 | ++cEnabledMonitors;
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| 267 | }
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| 268 | }
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| 269 | for (unsigned i = 0; i < cEnabledMonitors; ++i)
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| 270 | printf("Monitor %u: %dx%d, (%d, %d)\n", i, (int)aEnabledMonitors[i].w, (int)aEnabledMonitors[i].h,
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| 271 | (int)aEnabledMonitors[i].x, (int)aEnabledMonitors[i].y);
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| 272 | drmSendHints(&drmContext, aEnabledMonitors, cEnabledMonitors);
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| 273 | }
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| 274 | do
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| 275 | {
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| 276 | rc = VbglR3WaitEvent(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, RT_INDEFINITE_WAIT, &events);
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| 277 | } while (rc == VERR_INTERRUPTED);
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| 278 | if (RT_FAILURE(rc))
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| 279 | VBClLogFatalError("Failure waiting for event, rc=%Rrc\n", rc);
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| 280 | }
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| 281 | return 0;
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| 282 | }
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