From: Tejun Heo <htejun@gmail.com>
To: Andi Kleen <ak@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Srihari Vijayaraghavan <sriharivijayaraghavan@yahoo.com.au>,
Ingo Molnar <mingo@elte.hu>,
linux-ide@vger.kernel.org
Subject: Re: 2.6.24-rc & SB600 AHCI no go on >=4GB of RAM
Date: Tue, 20 Nov 2007 10:03:01 +0900 [thread overview]
Message-ID: <47423245.1050109@gmail.com> (raw)
In-Reply-To: <200711141746.26793.ak@suse.de>
Andi Kleen wrote:
>
>> The AHCI code falls back to 32bit DMA in that case. Which in turn
>> causes the problem seen by Srihari. There is not much printk sticking
>> necessary, the code is simply not handling this.
>
> What code is not handling what?
>
> IOMMU merging should be always safe. If it is not the driver should
> not submit things in a single SG list.
Yeap, a sg merged by IOMMU should be safe. It's just another contiguous
memory area from the POV of the controller anyway. I wonder what went
wrong here. What has exactly changed with iommu_merge patch?
--
tejun
next prev parent reply other threads:[~2007-11-20 1:03 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-14 11:55 2.6.24-rc & SB600 AHCI no go on >=4GB of RAM Srihari Vijayaraghavan
2007-11-14 12:17 ` Andi Kleen
2007-11-14 16:43 ` Thomas Gleixner
2007-11-14 16:46 ` Andi Kleen
2007-11-19 22:47 ` Srihari Vijayaraghavan
2007-11-20 1:03 ` Tejun Heo [this message]
2007-11-20 15:34 ` Thomas Gleixner
2007-11-20 15:44 ` Andi Kleen
2007-11-20 18:29 ` Thomas Gleixner
2007-11-20 18:43 ` Andi Kleen
2007-11-20 16:36 ` 2.6.24-rc & SB600 AHCI no go on >=4GB of RAM II Andi Kleen
2007-11-20 19:07 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2007-11-08 22:41 2.6.24-rc & SB600 AHCI no go on >=4GB of RAM Srihari Vijayaraghavan
2007-11-09 4:00 ` Tejun Heo
2007-11-12 10:56 ` Srihari Vijayaraghavan
2007-11-13 0:06 ` Srihari Vijayaraghavan
2007-11-13 3:08 ` Tejun Heo
2007-11-13 11:17 ` Srihari Vijayaraghavan
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