linux-kernel - Re: USB transfer_buffer allocations on 64bit systems

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Message-ID: <20100412124708.GO18855@one.firstfloor.org>
Date:	Mon, 12 Apr 2010 14:47:08 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Daniel Mack <daniel@...aq.de>
Cc:	Andi Kleen <andi@...stfloor.org>, Pedro Ribeiro <pedrib@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Greg KH <gregkh@...e.de>, alsa-devel@...a-project.org,
	linux-usb@...r.kernel.org
Subject: Re: USB transfer_buffer allocations on 64bit systems

On Mon, Apr 12, 2010 at 02:32:38PM +0200, Daniel Mack wrote:
> Another detail I can't explain is that on his machine, the kernel oopses
> when kmalloc() with GFP_DMA32 is used. The patch to try this also only
> touched the allocation in sound/usb/caiaq/audio.c.

Where did it oops?

> 
> > > The only which solved this problem was the first patch sent to me by
> > > Daniel Mack. I've been using it for days straight and it works fine.
> > 
> > Can you send a full boot log?
> 
> He just did. I put it online here:
> 
>   http://caiaq.de/download/tmp/pedro-dmesg

The system seems to set up the soft iotlb correctly.

[    0.468472] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[    0.468539] Placing 64MB software IO TLB between ffff880020000000 - ffff880024000000
[    0.468610] software IO TLB at phys 0x20000000 - 0x24000000

Also if that was wrong a lot more things would go wrong.

I would suspect the driver. Are you sure:

- it sets up it's dma_masks correctly?
- it uses pci_map_single/sg correctly for all transferred data?

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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