linux-kernel - Re: [RFC] sdhci: fix DMA leaks [was: [SHDCI] Heavy (thousands) DMA leaks]

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Message-ID: <20150805162522.GC16341@amd>
Date:	Wed, 5 Aug 2015 18:25:22 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Chen Bough <Haibo.Chen@...escale.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] sdhci: fix DMA leaks [was: [SHDCI] Heavy (thousands) DMA
 leaks]

On Wed 2015-08-05 17:11:48, Jiri Slaby wrote:
> On 08/05/2015, 01:52 PM, Jiri Slaby wrote:
> >> Yes, I see:
> >> sdhci-pci 0000:02:00.0: swiotlb buffer is full (sz: 65536 bytes)
> >> after some time. The driver falls back to non-DMA transfers after that.
> >> It also generates a warning about that:
> >> WARNING: CPU: 0 PID: 0 at drivers/mmc/host/sdhci.c:857
> >> sdhci_prepare_data+0x8ec/0x900 [sdhci]()
> > 
> > I am attaching a debug patch and a debug log. You can see where
> > 0x00000000fffb0000 and 0x00000000fffe0000 is leaked. It is when 'invalid
> > cookie' error happens.
> 
> And you could see the cookie handling is totally bogus.
> 
> With this rewrite, I no longer see the problems. Could you confirm it
> still does the good job with respect to performance -- the numbers you
> mentioned in your commit.
> 
> Ulf, what do you think about the attached patch? (Do not look at the
> commented info prints.)

Umm. Normally we inline patches for easier comments.

Attaching it with type of _mailbox_ is not really good.

									Pavel

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