linux-kernel - Re: 3.9-rc1: crash kernel panic - not syncing: Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer

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Date:	Mon, 11 Mar 2013 11:42:50 +0800
From:	WANG Chao <chaowang@...hat.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Vivek Goyal <vgoyal@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>, Shuah Khan <shuahkhan@...il.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	CAI Qian <caiqian@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	kexec <kexec@...ts.infradead.org>,
	Dave Young <dyoung@...hat.com>,
	Takao Indoh <indou.takao@...fujitsu.com>
Subject: Re: 3.9-rc1: crash kernel panic - not syncing: Can not allocate SWIOTLB
 buffer earlier and can't now provide you with the DMA bounce buffer

On 03/09/2013 03:39 AM, Yinghai Lu wrote:
> [ Add more to To list ]
> 
> On Fri, Mar 8, 2013 at 10:24 AM, Yinghai Lu <yinghai@...nel.org> wrote:
>> On Fri, Mar 8, 2013 at 4:12 AM, WANG Chao <chaowang@...hat.com> wrote:
>>
>>>> what is 00:02.0 in your system?
>>> This IOMMU issue is related to https://lkml.org/lkml/2012/11/26/814. We can
>>> discuss this IOMMU issue in that thread.
>>> Anyway 00:02.0 is a video card, the box is Ivy Bridge.
>>> # lspci -s 00:02.0 -v
>>> 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
>>> Graphics Controller (rev 09) (prog-if 00 [VGA controller])
>>>         Subsystem: Intel Corporation Device 2211
>>>         Flags: bus master, fast devsel, latency 0, IRQ 44
>>>         Memory at afc00000 (64-bit, non-prefetchable) [size=4M]
>>>         Memory at c0000000 (64-bit, prefetchable) [size=256M]
>>>         I/O ports at 6000 [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
>>
>> disable drm for i915 will make your iommu work with dump?
>>
>>>
>>>
>>> Is it expected to intel_iommu=on or crashkernel_low to make 2nd kernel boot in
>>> 3.9? Back in 3.8, it works just fine w/ only crashkernel param.
>>
>> Yes, I really do not want to set crashkernel low range like 72M
>> automatically for all.
>> that would have the system with proper iommu support lose 72M under 4G
>> in first kernel.
>> And can not play allocate and return tricks, as first kernel have no
>> idea if iommu will work
>> on second kernel even iommu is working on first kernel.
>>
>> Better to fix iommu support at first.
>>
>> For old system that does not have DMAR or kernel does not have IOMMU
>> support enabled, or
>> user does not pass intel_iommu=on.
>> We could set crashkernel low range to 72M automatically.
> 
> It seem that it is not worthy to check case that does not support
> IOMMU in second kernel.
> 
> Please check attached patch that will just set crashkernel_low auto, and if the
> system DO support iommu with kdump, user can specify crashkernel_low=0
> to save low 72M.

The patch works flawlessly on my box! Thank you, Yinghai!
Let me know if anything else I can help.

WANG Chao

> 
> Thanks
> 
> Yinghai
> 

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