lkml.org 
[lkml]   [2010]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Regression] r8169: enable 64-bit DMA by default for PCI Express devices (v2)
On 03/26/2010 03:12 AM, � Engel wrote:
> On Thu, 25 March 2010 18:56:03 -0600, Robert Hancock wrote:
>>
>> Francois, ping? Is there anyone else that has access to this kind of
>> information about these chips?
>>
>> It's kind of interesting that there's only been one report of this
>> though. Either the affected chips are rare among people testing
>> 2.6.34-rc or there's something more to this. Maybe something
>> wierd/unusual about Jörn's system?
>>
>> Jörn, are any other devices on your system working with 64-bit
>> addressing? Try doing this:
>>
>> find /sys -name "*dma_mask_bits*" | xargs cat
>>
>> Does anything show more than 32?
>
> I've slightly changed the command:
> # for i in `find /sys -name "*dma_mask_bits*"`; do echo -n "$i: "; cat $i; done
> /sys/devices/pci0000:00/0000:00:00.0/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:00.0/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:02.0/dma_mask_bits: 36
> /sys/devices/pci0000:00/0000:00:02.0/consistent_dma_mask_bits: 36
> /sys/devices/pci0000:00/0000:00:1c.0/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1c.0/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1c.1/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1c.1/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1c.1/0000:01:00.0/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1c.1/0000:01:00.0/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.0/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.0/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.1/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.1/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.2/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.2/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.3/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.3/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.7/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1d.7/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1e.0/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1e.0/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1f.0/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1f.0/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1f.1/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1f.1/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1f.2/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1f.2/consistent_dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1f.3/dma_mask_bits: 32
> /sys/devices/pci0000:00/0000:00:1f.3/consistent_dma_mask_bits: 32
>
> One device, which should be this one:
> 00:02.0 VGA compatible controller: Intel Corporation 82G33/G31 Express Integrated Graphics Controller (rev 10)

Well, that one's 36 bits, but it's unclear whether that driver would
actually be likely to access anything over 4GB. It's possible that
there's just some general problem with 64-bit DMA on that machine.

The fact that even stuff like lspci and MII is breaking seems odd,
though. It could be that model of card doesn't like the PCIDAC register
bit being set (maybe it means something different on that model, or
something).

I suppose a publicly accessible datasheet for these chips is too much to
hope for?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2010-03-27 02:57    [W:1.856 / U:0.628 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site