From: James Bottomley <James.Bottomley@SteelEye.com>
To: Grant Grundler <grundler@parisc-linux.org>
Cc: PARISC list <parisc-linux@lists.parisc-linux.org>
Subject: Re: [parisc-linux] BUG 2.6.12-rc3-pa1 PCI mmap panic
Date: Sun, 01 May 2005 14:24:20 -0500 [thread overview]
Message-ID: <1114975460.4788.27.camel@mulgrave> (raw)
In-Reply-To: <20050501074901.GA13801@colo.lackof.org>
On Sun, 2005-05-01 at 01:49 -0600, Grant Grundler wrote:
> Trying to get "tvflash" running on pa8800. tvflash is a userspace
> firmware flash tool for mellanox infiniband boards.
> Works fine on x86, x86-64, ia64, ppc, and sparc64.
> "tvflash -i" is supposed to go off and identify all
> installed mellanox boards and which firmware rev they
> currently have.
>
> The panic is in pfn_to_nid():
> r = pfnnid_map[i];
> BUG_ON(r == 0xff); <---- panic
>
> Any clue what's broken?
pfnnid_map is a map per 1gb (currently what PFNNID_SHIFT defines) of our
memory range showing which discontig chunk this maps to. 0xff means the
range maps nowhere.
Without better debugging, it's hard to say, but I guess that this flash
tool is actually trying to mmap a region of memory on the PCI card and
it's tripping over this section of code. My second order guess would be
that we don't update the pfnnid_map when we actually declare a card I/O
range, so the kernel thinks it can map the region OK but we erroneously
trip this bug.
I'm with Joel on this one: Can you reproduce the problem without
CONFIG_DISCONTIGMEM?
James
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next prev parent reply other threads:[~2005-05-01 19:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-01 7:49 [parisc-linux] BUG 2.6.12-rc3-pa1 PCI mmap panic Grant Grundler
[not found] ` <4274FC81.4060906@tiscali.be>
2005-05-01 17:24 ` Grant Grundler
2005-05-01 19:24 ` James Bottomley [this message]
2005-05-02 0:08 ` Grant Grundler
2005-05-02 0:31 ` James Bottomley
2005-05-02 4:12 ` Grant Grundler
2005-05-02 14:51 ` James Bottomley
2005-05-02 16:00 ` Grant Grundler
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