# Port of GEM and KMS ## Status The latest drm code from FreeBSD 9.x current has been successfully ported to DragonFly BSD, [patch](http://leaf.dragonflybsd.org/~davshao/r600fbsd.diff) and git branch **r600fbsd** git://leaf.dragonflybsd.org/~davshao/dragonfly.git, and tested with a Radeon HD 4550 on an x86_64 machine (Shuttle SG45H7). However it must be remembered that testing has only been done with this one graphics card and it is completely unknown whether say an Intel machine will lock up solid. Also nothing was done to port the extensive Via drivers FreeBSD has already ported. ## Introduction or what the heck is being talked about We are talking about modern graphics card drivers that have already or are in the process of being written for Linux. Fortunately for the BSDs the source code that is the basis of these drivers, part hosted in git repositories accessible from [freedesktop.org](http://cgit.freedesktop.org/), and even the part that is now residing in the Linux kernel, is mostly licensed under terms compatible with the [MIT X License](http://www.opensource.org/licenses/mit-license.php), and therefore can be directly ported to DragonFly. When we refer to DRM, we are referring to the [Direct Render Manager](http://dri.freedesktop.org/wiki/DRM) that is a kernel module arbitrating requests for various graphics related services. Because of this acronym, the source code for DragonFly's DRM module can be found in directory **sys/dev/drm**, while the source code for Linux'd DRM module has been split into **include/drm** hosting common header files and **drivers/gpu/drm**. Furthermore the Linux files have had vendor specific code split off into their own separate directories, a change the BSDs should consider since having all files in one directory is becoming rather unwieldy. ## Previous work makes the port possible Simply take a diff of the FreeBSD and DragonFlyBSD versions of DRM and one can readily see that the hard work of translating the semantics of the locking for the Linux drivers has mostly been done, and better still can be done almost automatically. The FreeBSD port represents the limits of what can be ported having worked out exclusive access mechanisms, but not having completely worked out equivalents of other Linux APIs such as **idr**, small integer ID management. ## What has been done and should be done The software used for graphics whether the kernel or Mesa is surprisingly resilient. As long as it compiles it will try and find a way with dealing with other mismatched components by falling back on default behavior. Working on a fast x86_64 machine, it is easy to be lulled into a false sense that things are working properly unless one checks the logs. ### **dmesg* output Here the proper kernel module appears to be loaded. I wasted quite a bit of time earlier this week not realizing an error that led to the kernel module not being loaded at all that appeared from the messages to be a device non-existence problem. drm0: on vgapci0 vgapci0: child drm0 requested pci_enable_busmaster info: [drm] Initialized radeon 1.31.0 20080613 info: [drm] Setting GART location based on new memory map info: [drm] Loading RV710 Microcode info: [drm] Resetting GPU info: [drm] writeback test succeeded in 1 usecs ### **var/log/Xorg.0.log** output Somewhere on one's system are the logs of the latest startup of the X server and the modules it finds. There can be an alternate place if one installs a second X.org, say at */opt/xtest*, in which case instead of **/var/log/Xorg.0.log** one will look in **/opt/xtest/var/log/Xorg.0.log**. Here's a case of a failure where things are fine: I am composing this wiki from within Firefox 3.6.3 on a system where the proper module fails to load and yet where because of the machine's speed there is no discernible problem. drmOpenDevice: node name is /dev/dri/card0 drmOpenDevice: open result is 10, (OK) drmOpenByBusid: Searching for BusID pci:0000:01:00.0 drmOpenDevice: node name is /dev/dri/card0 drmOpenDevice: open result is 10, (OK) drmOpenByBusid: drmOpenMinor returns 10 drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0 (EE) AIGLX error: dlopen of /usr/pkg/lib/dri/r600_dri.so failed (Cannot open "/usr/pkg/lib/dri/r600_dri.so") (EE) AIGLX: reverting to software rendering (II) AIGLX: Loaded and initialized /usr/pkg/lib/dri/swrast_dri.so The Mesa 7.4.x series simply didn't *have* an r600_drv.so driver so of course it can't be found. Mesa happily falls back to using software rendering and nothing seems greatly wrong. Now here is an example using latest Mesa and everything else from git where the driver is found: [ 95.404] drmOpenDevice: node name is /dev/dri/card0 [ 95.405] drmOpenDevice: open result is 11, (OK) [ 95.405] drmOpenByBusid: Searching for BusID pci:0000:01:00.0 [ 95.405] drmOpenDevice: node name is /dev/dri/card0 [ 95.405] drmOpenDevice: open result is 11, (OK) [ 95.405] drmOpenByBusid: drmOpenMinor returns 11 [ 95.405] drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0 [ 95.507] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer [ 95.507] (II) AIGLX: enabled GLX_SGI_make_current_read [ 95.507] (II) AIGLX: enabled GLX_texture_from_pixmap with driver support [ 95.507] (II) AIGLX: Loaded and initialized /opt/xtest/lib/dri/r600_dri.so [ 95.507] (II) GLX: Initialized DRI GL provider for screen 0 [ 95.508] (II) RADEON(0): Setting screen physical size to 508 x 285 Ironically I knew I was on the right track porting the latest git versions of the X.org stack when I succeeded in locking up hard my machine. That meant a real hardware acceleration module was being loaded by that the previous kernel could not handle it, which was why the latest drm from FreeBSD had to be imported for Radeon r600. ## Installing from pkgsrc As of 2010-05-09, I find it necessary on x86_64 to use the following patch for pkgsrc gstreamer0.10, an eventual dependency of the full xfce desktop: --- pkgsrc/multimedia/gstreamer0.10/Makefile.orig 2010-03-29 16:04:23 -0700 +++ pkgsrc/multimedia/gstreamer0.10/Makefile 2010-03-29 16:09:04 -0700 @@ -44,6 +44,11 @@ .include "../../mk/bsd.prefs.mk" +# __udivti3 error otherwise +.if ${OPSYS} == "DragonFly" && ${MACHINE_ARCH} == "x86_64" +MAKEFLAGS+= CCVER=gcc44 +.endif + .if ${OPSYS} == "NetBSD" # We must have a glib2 compiled with the RTLD_GLOBAL fix; if not, plugins # won't work at all. See for example the following bug report for more details: ## Building a separate version of X.org We try something **ill-advised**, we build a separate version of X.org in another directory, say */opt/xbeta*, on the same machine where we have installed the latext pkgsrc. We do this because we have no choice but to use the graphics hardware on this machine, but the risk is that it is very easy to link the wrong libraries from pkgsrc. ### expat and gettext We start with installing into */opt/xbeta* [expat 2.0.1](http://sourceforge.net/projects/expat/) and [gettext 0.17](http://www.gnu.org/software/gettext/). ### Git repository for most of X.org We use the following listing: [freedesktop.org git repository browser](http://cgit.freedesktop.org/) One can easily script getting, updating, and building the projects listed on that page. ### Example of using ldd $ ldd ./libXau.so.6 ./libXau.so.6: libc.so.7 => /usr/lib/libc.so.7 (0x800640000) $ ldd ./libXdmcp.so.6 ./libXdmcp.so.6: libc.so.7 => /usr/lib/libc.so.7 (0x800640000) ### libxcb problem with Python 2.6 cElementTree Library *xcb/libxcb* unfortunately needs to be built early and there is a catch for using pkgsrc Python 2.6. Unfortunately at the current time not all of *cElementTree* appears to be functional; therefore, one needs a patch similar to diff --git a/src/c_client.py b/src/c_client.py index d86d05e..36a7039 100755 --- a/src/c_client.py +++ b/src/c_client.py @@ -1,5 +1,5 @@ #!/usr/bin/env python -from xml.etree.cElementTree import * +from xml.etree.ElementTree import * from os.path import basename import getopt import sys ### libXext CCLD libXext.la /usr/libexec/binutils217/elf/ld: .libs/extutil.o: relocation R_X86_64_PC32 against `xgeExtRegister' can not be used when making a shared object; recompile with -fPIC /usr/libexec/binutils217/elf/ld: final link failed: Bad value Use the following patch from diff --git a/src/Xge.c b/src/Xge.c index 7a583e5..2ea5d27 100644 --- a/src/Xge.c +++ b/src/Xge.c @@ -294,7 +294,7 @@ _xgeEventToWire(Display* dpy, XEvent* re, xEvent* event) /* * Extensions need to register callbacks for their events. */ -Bool +_X_HIDDEN Bool xgeExtRegister(Display* dpy, int offset, XExtensionHooks* callbacks) { XGEExtNode* newExt;