Re: intel graphics loosing msi interrupt on subsequent starts

On Mon, 2009-05-04 at 20:40 +0200, Alexey Shuvaev wrote:
> Hello all!
> 
> Sorry if it is already reported...
> 
> I have recently upgaded X server from 1.4  to 1.6
> (ports from ~23.01.2009 -> 03.05.2009).
> On the first start everything works ok (including [glx]gears).
> On the second and subsequent starts everything looks working but jerky,
> I need to move mouse around to get some windows redrawn,
> [glx]gears print warning message about not getting vblank interrupts
> and outputs something about 1-2 frames per 5 seconds.
> 
> The inspectation with vmstat -i has shown that the card generates
> interrupts only during the first start of X server.
> 
> If I set hw.pci.enable_msi="0" everything is working fine (start X server
> multiple times, switch consoles, [glx]gears, number of irq16-s
> is increasing, ...).

irq16 is likely shared, so this may or may not be true...  At least in
some cases, I was seeing the interrupt handler processing events when
some other device on the shared interrupt fired.  Interrupts on Intel
have been a real pain.  There is a drm specific tuneable for disabling
msi hw.drm.msi=0.  I have a patch which I'm currently using on my g45
that overhauls the way that we handle interrupts.  

http://people.freebsd.org/~rnoland/drm-intel-050209.patch

Reports have been mixed with this, but it is working for me...

robert.

> I can't be sure it is only due to X upgrade,
> I have upgraded the base system also (~2 weeks old CURRENT -> 03.05.2009).
> 
> Some quick to gather system details:
> 
> ~> uname -a
> FreeBSD wep4035 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Sun May  3 03:04:41 CEST 2009     root_at_wep4035:/usr/obj/usr/src/sys/GENERIC  amd64 
> (4 GB of RAM, Core2Duo, if it matters)

I'm running the same.

> >From pciconf -lv:
> vgapci0_at_pci0:0:2:0:     class=0x030000 card=0x82761043 chip=0x29c28086 rev=0x02 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = '(Bearlake) Integrated Graphics Controller'
>     class      = display
>     subclass   = VGA
> 
> >From dmesg with hw.pci.enable_msi="0":
> vgapci0: <VGA-compatible display> port 0xbc00-0xbc07 mem 0xfe980000-0xfe9fffff,0xd0000000-0xdfffffff,0xfe800000-0xfe8fffff irq 16 at device 2.0 on pci0
> agp0: <Intel G33 SVGA controller> on vgapci0
> agp0: detected 7164k stolen memory
> agp0: aperture size is 256M
> drm0: <Intel G33> on vgapci0
> vgapci0: child drm0 requested pci_enable_busmaster
> info: [drm] AGP at 0xd0000000 256MB
> info: [drm] Initialized i915 1.6.0 20080730
> 
> >From dmesg with default settings:
> vgapci0: <VGA-compatible display> port 0xbc00-0xbc07 mem 0xfe980000-0xfe9fffff,0xd0000000-0xdfffffff,0xfe800000-0xfe8fffff irq 16 at device 2.0 on pci0
> agp0: <Intel G33 SVGA controller> on vgapci0
> agp0: detected 7164k stolen memory
> agp0: aperture size is 256M
> drm0: <Intel G33> on vgapci0
> info: [drm] MSI enabled 1 message(s)
> vgapci0: child drm0 requested pci_enable_busmaster
> info: [drm] AGP at 0xd0000000 256MB
> info: [drm] Initialized i915 1.6.0 20080730
> 
> Thanks,
> Alexey.
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-- 
Robert Noland <rnoland_at_FreeBSD.org>
FreeBSD