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From: Robert Hancock <hancockrwd@gmail.com>
To: Andi Kleen <ak@linux.intel.com>
Cc: Chuck Ebbert <cebbert@redhat.com>,
	linux-kernel@vger.kernel.org,
	David Woodhouse <dwmw2@infradead.org>
Subject: Re: b44 driver causes panic when using swiotlb
Date: Tue, 1 Feb 2011 15:44:41 -0600	[thread overview]
Message-ID: <AANLkTimLZv4+zfMf0MWwPthG1Osnq3EFEg824u7DF6bK@mail.gmail.com> (raw)
In-Reply-To: <20110201180749.GA19382@tassilo.jf.intel.com>

On Tue, Feb 1, 2011 at 12:07 PM, Andi Kleen <ak@linux.intel.com> wrote:
> On Mon, Jan 31, 2011 at 06:54:21PM -0600, Robert Hancock wrote:
>> On 01/31/2011 10:36 AM, Andi Kleen wrote:
>> >On Mon, Jan 31, 2011 at 10:54:12AM -0500, Chuck Ebbert wrote:
>> >>The b44 driver is triggering this panic in swiotlb_map_page():
>> >>
>> >>         if (!dma_capable(dev, dev_addr, size))
>> >>                 panic("map_single: bounce buffer is not DMA'ble");
>> >>
>> >>The kernel log says the bounce buffers are at 0xdb400000, but b44 can
>> >>only do DMA to the first 1GB of memory:
>> >
>> >b44 needs to use GFP_DMA then and do its own custom bouncing.
>> >The standard pci_map_* bounce buffering is only designed for at least
>> >32bit capable devices.
>>
>> That seems wrong - it's a documented API and that restriction isn'
>
> Please read the documentation. When PCI DMA cannot handle it
> it returns failure. That is what happened here.

Apparently not, given that it hit a panic inside the swiotlb code..

  reply	other threads:[~2011-02-01 21:44 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-31 15:54 Chuck Ebbert
2011-01-31 16:36 ` Andi Kleen
2011-02-01  0:54   ` Robert Hancock
2011-02-01  1:28     ` FUJITA Tomonori
2011-02-01  3:22       ` Robert Hancock
2011-02-01  5:22         ` FUJITA Tomonori
2011-02-15  0:47           ` Robert Hancock
2011-02-01 21:18       ` Chuck Ebbert
2011-02-02  0:06         ` FUJITA Tomonori
2011-02-02  0:09           ` FUJITA Tomonori
2011-02-01 18:07     ` Andi Kleen
2011-02-01 21:44       ` Robert Hancock [this message]
2011-02-01 13:54 ` FUJITA Tomonori
2011-02-14 11:59   ` FUJITA Tomonori
2011-02-14 16:41     ` Arkadiusz Miśkiewicz
2011-02-15  0:39       ` FUJITA Tomonori
2011-02-15 22:03     ` Chuck Ebbert
     [not found] <4D478EDC.4070004@lwfinger.net>
2011-02-01  4:53 ` Larry Finger

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