linux-kernel - Re: [git pull] drm main pull for 3.4-rc1

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Date:	Tue, 27 Mar 2012 11:24:01 +0100
From:	Tony Vroon <tony@...x.net>
To:	Dave Airlie <airlied@...ux.ie>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	linux-kernel@...r.kernel.org, Matt Turner <mattst88@...il.com>
Subject: Re: [git pull] drm main pull for 3.4-rc1

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On 27/03/12 11:11, Tony Vroon wrote:
> No DMAR complaints in dmesg yet; it would have crashed by now if
> the fault was present.

To confirm, it is stable.
So ppgtt + VT-d is problematic on:
00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd
Generation Core Processor Family Integrated Graphics Controller
[8086:0126] (rev 09) (prog-if 00 [VGA controller])
	Subsystem: Fujitsu Limited. Device [10cf:15e9]
	Flags: bus master, fast devsel, latency 0, IRQ 42
	Memory at e0000000 (64-bit, non-prefetchable) [size=4M]
	Memory at d0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 3000 [size=64]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [a4] PCI Advanced Features
	Kernel driver in use: i915

For the avoidance of doubt, it is a mobile Core i7 part:
cpu family	: 6
model		: 42
model name	: Intel(R) Core(TM) i7-2620M CPU @ 2.70GHz
stepping	: 7
microcode	: 0x25

Prior to the crash, I see:
DRHD: handling fault status reg 3
DMAR:[DMA Write] Request device [00:02.0] fault addr 12806b000
DMAR:[fault reason 05] PTE Write access is not set
DRHD: handling fault status reg 3
DMAR:[DMA Write] Request device [00:02.0] fault addr 128183000
DMAR:[fault reason 05] PTE Write access is not set
DRHD: handling fault status reg 3
DMAR:[DMA Write] Request device [00:02.0] fault addr 4147562000
DMAR:[fault reason 05] PTE Write access is not set
DRHD: handling fault status reg 3
DMAR:[DMA Write] Request device [00:02.0] fault addr 4147562000
DMAR:[fault reason 05] PTE Write access is not set

So I believe a bisection should point at commit
e21af88d39796c907c38648c824be3d646ffbe35, but I am willing to run one
if you really feel there is more to it?

Regards,
- -- 
Tony Vroon
UNIX systems administrator
London Internet Exchange Ltd, Trinity Court, Trinity Street,
Peterborough, PE1 1DA
Registered in England number 3137929
E-Mail: tony@...x.net
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