lkml.org 
[lkml]   [2009]   [Jun]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: pci 0000:01:00.0: BAR 6: no parent found for of device [0xfffe0000-0xffffffff]
From
On Wed, Jun 24, 2009 at 1:04 PM, Jesse Barnes<jbarnes@virtuousgeek.org> wrote:
> On Wed, 24 Jun 2009 13:50:30 -0600
> Matthew Wilcox <matthew@wil.cx> wrote:
>
>> On Wed, Jun 24, 2009 at 09:30:07PM +0200, Rafael J. Wysocki wrote:
>> > (Adding CC to linux-pci)
>>
>> Thanks Rafael.
>>
>> > On Wednesday 24 June 2009, Justin Mattock wrote:
>> > > (just pulled the latest git)
>> > > And am seeing this:
>> >
>> > Where pci 0000:01:00.0 and 0000:02:00.0 are what?
>> >
>> > > [    0.696001] pci 0000:01:00.0: BAR 6: no parent found for of
>> > > device [0xfffe0000-0xffffffff]
>>
>> So the message is coming from pci_claim_resource, and
>> if you bother to bisect, you'll track it back to my commit
>> a76117dfd687ec4be0a9a05214f3009cc5f73a42 .  What's going on here,
>> since this is BAR 6, is we have a ROM which has been mapped high, and
>> then not unmapped.  The BAR doesn't fit in the parent's window, so
>> the code is rightly declining to allocate the BAR.
>>
>> Before my patch, we silently didn't allocate the BARs.  Now we print
>> a message.  I wonder what to do ... we could silence this warning in
>> pci_claim_resource (patch below).  Or we could declare this to be a
>> bug, and fix it by disabling the ROM BAR (by clearing bit 0).
>>
>> I'm agnostic ... anyone have any preferences?
>
> Well, given that sometimes the ROM is important, it seems like an
> error.  Really we should be smarter about re-allocating things as
> necessary...
>
> --
> Jesse Barnes, Intel Open Source Technology Center
>

I guess the easiest would be to silence the problem,
(but personally I don work that way)
So I opt for the second choice:
we could declare this to be a
bug, and fix it by disabling the ROM BAR (by clearing bit 0).

So If and when, I can test out a patch.

--
Justin P. Mattock
--
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: 2009-06-24 22:43    [W:0.043 / U:4.452 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site