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/* $Id: display-svga.cpp $ */
/** @file
* X11 guest client - VMSVGA emulation resize event pass-through to drm guest
* driver.
*/
/*
* Copyright (C) 2016-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*
* Known things to test when changing this code. All assume a guest with VMSVGA
* active and controlled by X11 or Wayland, and Guest Additions installed and
* running, unless otherwise stated.
* - On Linux 4.6 and later guests, VBoxClient --vmsvga should be running as
* root and not as the logged-in user. Dynamic resizing should work for all
* screens in any environment which handles kernel resize notifications,
* including at log-in screens. Test GNOME Shell Wayland and GNOME Shell
* under X.Org or Unity or KDE at the log-in screen and after log-in.
* - Linux 4.10 changed the user-kernel-ABI introduced in 4.6: test both.
* - On other guests (than Linux 4.6 or later) running X.Org Server 1.3 or
* later, VBoxClient --vmsvga should never be running as root, and should run
* (and dynamic resizing and screen enable/disable should work for all
* screens) whenever a user is logged in to a supported desktop environment.
* - On guests running X.Org Server 1.2 or older, VBoxClient --vmsvga should
* never run as root and should run whenever a user is logged in to a
* supported desktop environment. Dynamic resizing should work for the first
* screen, and enabling others should not be possible.
* - When VMSVGA is not enabled, VBoxClient --vmsvga should never stay running.
*/
#include "VBoxClient.h"
#include <VBox/VBoxGuestLib.h>
#include <iprt/assert.h>
#include <iprt/file.h>
#include <iprt/err.h>
#include <iprt/string.h>
/** Maximum number of supported screens. DRM and X11 both limit this to 32. */
/** @todo if this ever changes, dynamically allocate resizeable arrays in the
* context structure. */
#define VMW_MAX_HEADS 32
/* VMWare kernel driver control parts definitions. */
#ifdef RT_OS_LINUX
# include <sys/ioctl.h>
#else /* Solaris and BSDs, in case they ever adopt the DRM driver. */
# include <sys/ioccom.h>
#endif
#define DRM_DRIVER_NAME "vmwgfx"
/** DRM version structure. */
struct DRMVERSION
{
int cMajor;
int cMinor;
int cPatchLevel;
size_t cbName;
char *pszName;
size_t cbDate;
char *pszDate;
size_t cbDescription;
char *pszDescription;
};
AssertCompileSize(struct DRMVERSION, 8 + 7 * sizeof(void *));
/** Rectangle structure for geometry of a single screen. */
struct DRMVMWRECT
{
int32_t x;
int32_t y;
uint32_t w;
uint32_t h;
};
AssertCompileSize(struct DRMVMWRECT, 16);
#define DRM_IOCTL_VERSION _IOWR('d', 0x00, struct DRMVERSION)
struct DRMCONTEXT
{
RTFILE hDevice;
};
static void drmConnect(struct DRMCONTEXT *pContext)
{
unsigned i;
RTFILE hDevice;
if (pContext->hDevice != NIL_RTFILE)
VBClFatalError(("%s called with bad argument\n", __func__));
/* Try to open the SVGA DRM device. */
for (i = 0; i < 128; ++i)
{
char szPath[64];
struct DRMVERSION version;
char szName[sizeof(DRM_DRIVER_NAME)];
int rc;
/* Control devices for drm graphics driver control devices go from
* controlD64 to controlD127. Render node devices go from renderD128
* to renderD192. The driver takes resize hints via the control device
* on pre-4.10 kernels and on the render device on newer ones. Try
* both types. */
if (i % 2 == 0)
rc = RTStrPrintf(szPath, sizeof(szPath), "/dev/dri/renderD%u", i / 2 + 128);
else
rc = RTStrPrintf(szPath, sizeof(szPath), "/dev/dri/controlD%u", i / 2 + 64);
if (RT_FAILURE(rc))
VBClFatalError(("RTStrPrintf of device path failed, rc=%Rrc\n", rc));
rc = RTFileOpen(&hDevice, szPath, RTFILE_O_READWRITE | RTFILE_O_OPEN | RTFILE_O_DENY_NONE);
if (RT_FAILURE(rc))
continue;
RT_ZERO(version);
version.cbName = sizeof(szName);
version.pszName = szName;
rc = RTFileIoCtl(hDevice, DRM_IOCTL_VERSION, &version, sizeof(version), NULL);
if ( RT_SUCCESS(rc)
&& !strncmp(szName, DRM_DRIVER_NAME, sizeof(DRM_DRIVER_NAME) - 1)
&& ( version.cMajor > 2
|| (version.cMajor == 2 && version.cMinor > 9)))
break;
hDevice = NIL_RTFILE;
}
pContext->hDevice = hDevice;
}
/** Preferred screen layout information for DRM_VMW_UPDATE_LAYOUT IoCtl. The
* rects argument is a cast pointer to an array of drm_vmw_rect. */
struct DRMVMWUPDATELAYOUT {
uint32_t cOutputs;
uint32_t u32Pad;
uint64_t ptrRects;
};
AssertCompileSize(struct DRMVMWUPDATELAYOUT, 16);
#define DRM_IOCTL_VMW_UPDATE_LAYOUT \
_IOW('d', 0x40 + 20, struct DRMVMWUPDATELAYOUT)
static void drmSendHints(struct DRMCONTEXT *pContext, struct DRMVMWRECT *paRects,
unsigned cHeads)
{
int rc;
struct DRMVMWUPDATELAYOUT ioctlLayout;
if (pContext->hDevice == NIL_RTFILE)
VBClFatalError(("%s bad device argument.\n", __func__));
ioctlLayout.cOutputs = cHeads;
ioctlLayout.ptrRects = (uint64_t)paRects;
rc = RTFileIoCtl(pContext->hDevice, DRM_IOCTL_VMW_UPDATE_LAYOUT,
&ioctlLayout, sizeof(ioctlLayout), NULL);
if (RT_FAILURE(rc) && rc != VERR_INVALID_PARAMETER)
VBClFatalError(("Failure updating layout, rc=%Rrc\n", rc));
}
static const char *getPidFilePath()
{
return ".vboxclient-display-svga.pid";
}
static int run(struct VBCLSERVICE **ppInterface, bool fDaemonised)
{
(void)ppInterface;
(void)fDaemonised;
struct DRMCONTEXT drmContext = { NIL_RTFILE };
unsigned i;
int rc;
uint32_t acx[VMW_MAX_HEADS] = { 0 };
uint32_t acy[VMW_MAX_HEADS] = { 0 };
uint32_t adx[VMW_MAX_HEADS] = { 0 };
uint32_t ady[VMW_MAX_HEADS] = { 0 };
uint32_t afEnabled[VMW_MAX_HEADS] = { false };
struct DRMVMWRECT aRects[VMW_MAX_HEADS];
unsigned cHeads;
drmConnect(&drmContext);
if (drmContext.hDevice == NIL_RTFILE)
return VINF_SUCCESS;
/* Initialise the guest library. */
rc = VbglR3InitUser();
if (RT_FAILURE(rc))
VBClFatalError(("Failed to connect to the VirtualBox kernel service, rc=%Rrc\n", rc));
rc = VbglR3CtlFilterMask(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, 0);
if (RT_FAILURE(rc))
VBClFatalError(("Failed to request display change events, rc=%Rrc\n", rc));
rc = VbglR3AcquireGuestCaps(VMMDEV_GUEST_SUPPORTS_GRAPHICS, 0, false);
if (rc == VERR_RESOURCE_BUSY) /* Someone else has already acquired it. */
return VINF_SUCCESS;
if (RT_FAILURE(rc))
VBClFatalError(("Failed to register resizing support, rc=%Rrc\n", rc));
for (;;)
{
uint32_t events;
rc = VbglR3WaitEvent(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, RT_INDEFINITE_WAIT, &events);
if (RT_FAILURE(rc))
VBClFatalError(("Failure waiting for event, rc=%Rrc\n", rc));
while (rc != VERR_TIMEOUT)
{
uint32_t cx, cy, cBits, dx, dy, idx;
bool fEnabled, fChangeOrigin;
rc = VbglR3GetDisplayChangeRequest(&cx, &cy, &cBits, &idx, &dx, &dy, &fEnabled, &fChangeOrigin, true);
if (RT_FAILURE(rc))
VBClFatalError(("Failed to get display change request, rc=%Rrc\n", rc));
if (idx < VMW_MAX_HEADS)
{
acx[idx] = cx;
acy[idx] = cy;
if (fChangeOrigin)
adx[idx] = dx < INT32_MAX ? dx : 0;
if (fChangeOrigin)
ady[idx] = dy < INT32_MAX ? dy : 0;
afEnabled[idx] = fEnabled;
}
rc = VbglR3WaitEvent(VMMDEV_EVENT_DISPLAY_CHANGE_REQUEST, 0, &events);
if (RT_FAILURE(rc) && rc != VERR_TIMEOUT && rc != VERR_INTERRUPTED)
VBClFatalError(("Failure waiting for event, rc=%Rrc\n", rc));
}
for (i = 0, cHeads = 0; i < VMW_MAX_HEADS; ++i)
{
if (afEnabled[i])
{
if ((i == 0) || (adx[i] || ady[i]))
{
aRects[cHeads].x = (int32_t)adx[i];
aRects[cHeads].y = (int32_t)ady[i];
} else {
aRects[cHeads].x = (int32_t)(adx[i - 1] + acx[i - 1]);
aRects[cHeads].y = (int32_t)ady[i - 1];
}
aRects[cHeads].w = acx[i];
aRects[cHeads].h = acy[i];
++cHeads;
}
}
drmSendHints(&drmContext, aRects, cHeads);
}
}
static struct VBCLSERVICE interface =
{
getPidFilePath,
VBClServiceDefaultHandler, /* Init */
run,
VBClServiceDefaultCleanup
}, *pInterface = &interface;
struct VBCLSERVICE **VBClDisplaySVGAService()
{
return &pInterface;
}
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