linux-kernel - Re: iommu_iova leak [inside 3w-9xxx]

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Message-ID: <CAHtARFHfxpU1JKu4092ZshvhsrRY-hx_pfnL3_+T32B3ncgWvg@mail.gmail.com>
Date:	Sat, 17 Sep 2011 12:22:12 -0700
From:	adam radford <aradford@...il.com>
To:	Chris Boot <bootc@...tc.net>
Cc:	"Woodhouse, David" <david.woodhouse@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Adam Radford <linuxraid@....com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org
Subject: Re: iommu_iova leak [inside 3w-9xxx]

On Sat, Sep 17, 2011 at 7:29 AM, Chris Boot <bootc@...tc.net> wrote:
> On 17 Sep 2011, at 12:57, Chris Boot wrote:
>> On 17 Sep 2011, at 11:45, Woodhouse, David wrote:
>>> I suppose it's vaguely possible that we're leaking them in such a way
>>> that they remain on the rbtree, perhaps if the deferred unmap is never
>>> actually happening... but I think it's a whole lot more likely that the
>>> PCI driver is just never bothering to unmap the pages it maps.

If you think 3w-9xxx is not unmapping pages it maps, please re-run with
CONFIG_PCI_DMA_DEBUG=y

-Adam
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