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SubjectErrors in i810 DRM driver, 2.4.21-pre5-ac1

When I boot 2.4.21-pre5-ac1 on a system with an i810 card and i810 DRM
supported in the kernel, following lines are printed continuously to the
kernel log:

PCI: Found IRQ 12 for device 00:01.0
[drm:i810_wait_ring] *ERROR* space: 65520 wanted 65528
[drm:i810_wait_ring] *ERROR* lockup
mtrr: base(0xd0000000) is not aligned on a size(0x180000) boundary

The same messages were observed with 2.4.21-pre4-ac7. I haven't tried
other -ac kernels on that machine.

The system feels significantly slower. I have X and gdm running, the
messages are printed on the serial console. The workaround is to stop X
by "init 3" - the messages stop and the system becomes more responsive.

The system is Red Hat 8.0, kernel 2.4.21-pre5-ac1, XFree86-4.2.0-72,
gdm- (two later are native from Red Hat). No modules are

# /sbin/lspci
00:00.0 Host bridge: Intel Corp. 82810E DC-133 GMCH [Graphics Memory
Controller Hub] (rev 03)
00:01.0 VGA compatible controller: Intel Corp. 82810E DC-133 CGC [Chipset
Graphics Controller] (rev 03)
00:1e.0 PCI bridge: Intel Corp. 82801AA PCI Bridge (rev 02)
00:1f.0 ISA bridge: Intel Corp. 82801AA ISA Bridge (LPC) (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801AA IDE (rev 02)
00:1f.2 USB Controller: Intel Corp. 82801AA USB (rev 02)
00:1f.3 SMBus: Intel Corp. 82801AA SMBus (rev 02)
00:1f.5 Multimedia audio controller: Intel Corp. 82801AA AC'97 Audio (rev 02)
01:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev 80)
01:00.1 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev 80)
01:01.0 CardBus bridge: Texas Instruments PCI1410 PC card Cardbus Controller (rev 01)
01:07.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)

There is an interesting message when compiling i810_dma.c (most likely
irrelevant, but I'll report it anyway):

gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes
-Wno-trigraphs -O2 -fno-strict-aliasing -fno-common -pipe
-mpreferred-stack-boundary=2 -march=i686 -nostdinc -iwithprefix include
-DKBUILD_BASENAME=i810_dma -c -o i810_dma.o i810_dma.c
In file included from drmP.h:75,
from i810_dma.c:35:
drm_os_linux.h:16:2: warning: #warning the author of this code needs to
read up on list_entry

This patch fixes the loop, but it's really just a random fix without
understanding anything:

--- linux.orig/drivers/char/drm/i810_dma.c
+++ linux/drivers/char/drm/i810_dma.c
@@ -309,7 +309,7 @@ static int i810_wait_ring(drm_device_t *
end = jiffies + (HZ*3);
while (ring->space < n) {
ring->head = I810_READ(LP_RING + RING_HEAD) & HEAD_ADDR;
- ring->space = ring->head - (ring->tail+8);
+ ring->space = ring->head - ring->tail;
if (ring->space < 0) ring->space += ring->Size;

if (ring->head != last_head)
Still, the following messages are printed 4 times on startup:

mtrr: base(0xd0000000) is not aligned on a size(0x180000) boundary
PCI: Found IRQ 12 for device 00:01.0
Pavel Roskin
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