Kernel DRI support

[David Seery]

Hello,

I have a laptop with a Radeon IGP 320M U1 Mobility graphics card.

I've been looking for information on the bugzilla at XFree86, usenet,
various Linux forums and the archives of this and other mailing lists.
It's not too difficult to get the thing up and running, at the moment
with a patched XFree86 and a patched 2.6.2 kernel.

I have two questions:

1.  It seems like support for these nasty chipsets went into the kernel
around 2.4.22, but it doesn't work out of the box on 2.6.2 and I needed
to apply a patch, mostly to drivers/char/drm/radeon_cp.c, to shift the
base of the framebuffer.  This comes from http://bugs.xfree86.org/
show_bug.cgi?id=314.  The patch didn't apply cleanly so I did it by
hand.

Is this correct, or should the radeon agp stuff work as is?

2.  The result is not really any faster than doing it in software.  In
particular, it doesn't make any difference if I have mtrr write-
combining ranges set up or not, so it seems like the AGP acceleration
isn't really being used.   (This is why I am directing my query here.)

Am I off the mark here, or is this a known problem with support for
these IGP devices?

I've been unable to find previous responses about this.  Pardon me if
I'm rehashing old ground.

For benchmarking purposes, I get about 450-480 fps with glxgears as
compared with 430-450 without DRI.  Or, is there another reason I should
be thinking about for poor performance?  (Such as, the inherent badness
of the card, perhaps?)

Cheers,

David

Some relevant output:

dmesg | grep -i agp
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.AGPB._PRT]
Linux agpgart interface v0.100 (c) Dave Jones
agpgart: Detected Ati IGP320/M chipset
agpgart: Maximum main memory to use for agp memory: 148M
agpgart: AGP aperture is 64M @ 0xd4000000
agpgart: Found an AGP 2.0 compliant device at 0000:00:00.0.
agpgart: Putting AGP V2 device at 0000:00:00.0 into 4x mode
agpgart: Putting AGP V2 device at 0000:01:05.0 into 4x mode

dmesg | grep -i drm
[drm] Initialized i830 1.3.2 20021108 on minor 0
[drm] Initialized radeon 1.9.0 20020828 on minor 1

cat /proc/mtrr
reg00: base=0x00000000 (   0MB), size= 128MB: write-back, count=1
reg01: base=0x08000000 ( 128MB), size=  64MB: write-back, count=1
reg02: base=0xd4000000 (3392MB), size=  64MB: write-combining, count=2
reg03: base=0xe0000000 (3584MB), size=  64MB: write-combining, count=2

grep -i drm /var/log/XFree86.0.log        (trimmed)
drmOpenDevice: minor is 0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 6, (OK)
drmOpenDevice: minor is 0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 6, (OK)
drmOpenDevice: minor is 0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 6, (OK)
drmOpenDevice: minor is 1
drmOpenDevice: node name is /dev/dri/card1
drmOpenDevice: open result is 6, (OK)
drmGetBusid returned ''
(II) RADEON(0): [drm] created "radeon" driver at busid "PCI:1:5:0"
(II) RADEON(0): [drm] added 8192 byte SAREA at 0xcc92b000
(II) RADEON(0): [drm] mapped SAREA 0xcc92b000 to 0x44268000
(II) RADEON(0): [drm] framebuffer handle = 0xe0000000
(II) RADEON(0): [drm] added 1 reserved context for kernel
(II) RADEON(0): [drm] register handle = 0xd0100000
(II) RADEON(0): [drm] installed DRM signal handler
(II) RADEON(0): [drm] Added 32 65536 byte vertex/indirect buffers
(II) RADEON(0): [drm] Mapped 32 vertex/indirect buffers
(II) RADEON(0): [drm] dma control initialized, using IRQ 9
(II) RADEON(0): [drm] Initialized kernel GART heap manager, 5111808

grep -i agp /var/log/XFree86.0.log             (trimmed)
(**) RADEON(0): Option "AGPMode" "4"
(**) RADEON(0): Option "AGPFastWrite" "true"
(II) RADEON(0): AGP card detected
(**) RADEON(0): AGP 4x mode is configured
(**) RADEON(0): Enabling AGP Fast Write
(II) RADEON(0): [agp] Mode 0x0f000214 [AGP 0x1002/0xcab0; Card
0x1002/0x4336]
(II) RADEON(0): [agp] 8192 kB allocated with handle 0x00000001
(II) RADEON(0): [agp] ring handle = 0xd4000000
(II) RADEON(0): [agp] Ring mapped at 0x4426a000
(II) RADEON(0): [agp] ring read ptr handle = 0xd4101000
(II) RADEON(0): [agp] Ring read ptr mapped at 0x4436b000
(II) RADEON(0): [agp] vertex/indirect buffers handle = 0xd4102000
(II) RADEON(0): [agp] Vertex/indirect buffers mapped at 0x4436c000
(II) RADEON(0): [agp] GART texture map handle = 0xd4302000
(II) RADEON(0): [agp] GART Texture map mapped at 0x4456c000

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/