Editing PS3 GPU Driver

[[Category:Linux]]
=Introduction=

* FreeBSD character device which gives you direct access to PS3 GPU from user-space.

=Features=

* Upto 3 GPU contexts simultaneously (LV1 limit is 3 contexts per LPAR).
* Direct control of GPU FIFO from user-space.
* Support of hardware cursors.
* Dynamic allocation of GART memory.
* Mapping of GART memory into GPU address space is done by the driver. That means user-space applications do not have to worry about it.
* Access to GART and VRAM memory through mmap syscall.
* Heap management for GART and VRAM memory.
* Support of display buffers.

=Kernel Driver=

* http://gitorious.ps3dev.net/ps3freebsd/ps3gpu

==Requirements==

* You have to patch your LV1 and enable 4KB GPU IO page size support else ps3gpu won't work.
* You can either patch your LV1 permanently (e.g. with my ps3mfw task for LV1) or do it at run-time with my '''gpu_4kb_iopage.sh''' script.
* By default, LV1 supports 1MB and 64KB GPU IO page sizes but we need 4KB page size. The reason for this is that it's very hard to allocate 1MB or 64KB continuous memory chunk in FreeBSD kernel (same applies for Linux).
* gpu_4kb_iopage.sh should work with my petitboot and my Linux kernels and even on FreeBSD if you load ps3physmem driver before using the script.
* http://gitorious.ps3dev.net/ps3otheros/scripts

==Building==

* You can cross-compile the kernel module or build it natively on PS3 FreeBSD.
* The kernel module and the kernel should match. That means the kernel module should be build against the same kernel source else the kernel module cannot be loaded (The same applies on Linux).

<pre>
cd /usr/devel
env MAKEOBJDIRPREFIX=/usr/obj/PS3 SYSDIR=/usr/devel/sys make TARGET=powerpc TARGET_ARCH=powerpc64 buildenv
cd /home/glevand/ps3gpu
make
ls -l ps3gpu.ko
</pre>

==Test==

* ps3gpu_test is a user-space application for testing ps3gpu kernel driver.
* The application demonstrates how to allocate GART and VRAM memory, how to load, set and move cursor and how to flip.
* It shows you how to use RSX FIFO and send commands.
* It shows you how to use RSX DMA engine for memory copying (used e.g. in X11 driver all the time).
* It shows how to load vertex and fragment programs, draw vertices and flip displlay buffers.
* http://gitorious.ps3dev.net/ps3freebsd/ps3gpu_test

<pre>
kldload ./ps3gpu.ko

cd ps3gpu_test
make

sudo ./vram_dma
context id 0
control handle 0x10000000000 size 4096
fifo handle 0x40000000000 gpu addr 0x08d000000
FIFO put 0x0d000000 get 0x0d000000 ref 0xdeadbabe
reset GPU state handle 0x50000000000 gpu addr 0x0d010000
FIFO put 0x0d00000c get 0x0d00000c ref 0xcafef00d
VRAM handle 0x60000000000 gpu addr 0x00000000
cursor handle 0x70000000000 gpu addr 0x00900000
</pre>

To restore your console:
<pre>
vidcontrol < /dev/ttyv0 80x25
</pre>

==Screenshots==

* The square in the middle of the screen is the source.
* The square on the left was copied from the source by RSX DMA using positive pitches, from top to bottom.
* The square on the right was copied from the source by RSX DMA using negative pitches, from bottom to top.
* Unfortunately it's not possible to make a screenshot of hardware cursor by dumping video ram content because hardware cursor is overlayed.

vram_dma Example:
[[Image:Freebsd_ps3gpu_test.jpg|300px|Image: 300 pixels]]

triangle Example:
[[Image:Freebsd_ps3gpu_test_triangle.jpg|300px|Image: 300 pixels]]

=X11 Driver=

* You need this driver to run X11 server on PS3.
* The driver supports hardware acceleration through X11 EXA interface.
* Currently the driver uses only RSX DMA engine to copy memory.
* http://gitorious.ps3dev.net/ps3freebsd/xf86-video-ps3gpu
* The driver is still work in progress but is usable. Expect to see some artefacts :)
* Please report any problems and bugs to my.

==Building==

First install xorg port on your PS3. It will take a long time:
<pre>
cd /usr/ports/x11/xorg
make BATCH=yes install clean

# And install some window manager, e.g. blackbox

cd /usr/ports/x11-wm/blackbox
make BATCH=yes install clean

# Also install scrot to make screenshots

cd /usr/ports/graphics/scrot
make BATCH=yes install clean
</pre>

Now compile the X11 driver:
<pre>
cd xf86-video-ps3gpu
./autogen.sh
./configure
make
make install           # as root
</pre>

==xorg_accel.conf==

* Acceleration enabled.

<pre>

Section "ServerFlags"
	Option		"AllowEmptyInput" "False"
EndSection

Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen		0 "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
       	ModulePath	"/usr/local/lib/xorg/modules"
       	FontPath    	"/usr/local/lib/X11/fonts/misc/"
       	FontPath    	"/usr/local/lib/X11/fonts/TTF/"
       	FontPath    	"/usr/local/lib/X11/fonts/OTF"
       	FontPath    	"/usr/local/lib/X11/fonts/Type1/"
      	FontPath    	"/usr/local/lib/X11/fonts/100dpi/"
	FontPath    	"/usr/local/lib/X11/fonts/75dpi/"
EndSection

Section "Module"
	Load		"GLcore"
	Load		"dbe"
	Load		"dri"
	Load		"extmod"
	Load		"glx"
	Load		"record"
	Load		"shadow"
	Load		"freetype"
	Load		"type1"
EndSection

Section "InputDevice"
	Identifier	"Keyboard0"
	Driver		"kbd"
EndSection

Section "InputDevice"
	Identifier	"Mouse0"
  	Driver     	"mouse"
  	Option	   	"Protocol" "auto"
  	Option	   	"Device" "/dev/sysmouse"
  	Option	   	"ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
	Identifier	"Monitor0"
	VendorName	"Monitor Vendor"
	ModelName	"Monitor Model"
	HorizSync	30-75
	VertRefresh	60-90
EndSection

Section "Device"
	Identifier	"Card0"
	Driver		"ps3gpu"
	Option		"ShadowFB" "False"
	Option		"SWcursor" "False"
	Option		"NoAccel" "False"
EndSection

Section "Screen"
	Identifier     "Screen0"
	Device         "Card0"
	Monitor        "Monitor0"
	DefaultDepth	24
	SubSection     "Display"
		Modes		"1920x1080"
		Viewport	0 0
		Depth		24
	EndSubSection
EndSection
</pre>

==Test==

<pre>
# Load the ps3gpu driver

kldload ./ps3gpu.ko                          # as root

# Copy xorg.conf

cp xorg_accel.conf /etc/X11/xorg.conf        # as root

echo "exec blackbox" > ~/.xinitrc

startx

# Now you should see the blackbox desktop !!!
</pre>

==Screenshots==

* X11 and ps3gpu on FreeBSD 9.1 in action.

[[Image:Freebsd_91_x11_ps3gpu.png|300px|Image: 300 pixels]]

=Future Work=

* Create a cool application which demonstrates some 3D stuff using ps3gpu
* Use ps3gpu driver for syscons.

=Links=

* http://www.freebsd.org/cgi/cvsweb.cgi
* http://www.virtuousgeek.org/exa-driver.txt