From: Grant Grundler <grundler@parisc-linux.org>
To: James Bottomley <James.Bottomley@SteelEye.com>
Cc: PARISC list <parisc-linux@lists.parisc-linux.org>
Subject: Re: [parisc-linux] BUG 2.6.12-rc3-pa1 PCI mmap panic
Date: Sun, 1 May 2005 18:08:33 -0600 [thread overview]
Message-ID: <20050502000833.GE17998@colo.lackof.org> (raw)
In-Reply-To: <1114975460.4788.27.camel@mulgrave>
On Sun, May 01, 2005 at 02:24:20PM -0500, James Bottomley wrote:
> 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.
ok
> 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.
Yes. A copy of the openib_gen2 tree is parked on gsyprf11:/usr/src/ as well.
> 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.
*nod*. Where should we be telling the VM about MMIO ranges?
We clearly need to be advertising them.
> I'm with Joel on this one:
> Can you reproduce the problem without CONFIG_DISCONTIGMEM?
Yes. I rebuilt the kernel with CONFIG_DISCONTIGMEM=n.
I'm having doubts though that I rebooted the right kernel.
I believe so but post again later if not.
ion:/usr/src/openib_gen2/src/userspace/tvflash# src/tvflash -i
open_hca(0)
kernel BUG at include/asm/mmzone.h:85!
Backtrace:
[<0000000010113060>] dump_stack+0x18/0x28
[<00000000101813fc>] remap_pfn_range+0x37c/0x4b8
[<0000000010241934>] mmap_mem+0x2c/0x40
[<0000000010187288>] do_mmap_pgoff+0x478/0x858
[<0000000010114f84>] do_mmap2+0xa4/0x108
[<0000000010115030>] sys_mmap+0x28/0x38
[<0000000010107f80>] syscall_exit+0x0/0x14
Kernel panic - not syncing: BUG!
<0>Rebooting in 5 seconds..
thanks,
grant
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next prev parent reply other threads:[~2005-05-02 0:08 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
2005-05-02 0:08 ` Grant Grundler [this message]
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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