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Date: Thu, 8 Jan 2009 18:05:15 -0800
From: Dirk Hohndel <hohndel@...radead.org>
To: "Han, Weidong" <weidong.han@...el.com>
Cc: 'Grant Grundler' <grundler@...isc-linux.org>,
"'linux-pci@...r.kernel.org'" <linux-pci@...r.kernel.org>,
"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
'Jesse Barnes' <jbarnes@...tuousgeek.org>,
"'iommu@...ts.linux-foundation.org'"
<iommu@...ts.linux-foundation.org>, 'Ingo Molnar' <mingo@...e.hu>,
'Arjan van de Ven' <arjan@...radead.org>
Subject: Re: git-latest: kernel oops in IOMMU setup
On Fri, 9 Jan 2009 08:58:46 +0800 "Han, Weidong"
<weidong.han@...el.com> wrote:
> >>
> >> The oops happens very early during boot in device_to_iommu (called
> >> from domain_context_mapping_one).
> >>
> >> Looking at the code dump and the disassembled function here's where
> >> the error happens:
> >>
> >> static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn) {
> >> struct dmar_drhd_unit *drhd = NULL;
> >> int i;
> >>
> >> for_each_drhd_unit(drhd) {
> >> if (drhd->ignored)
> >> continue;
> >>
> >> for (i = 0; i < drhd->devices_cnt; i++)
> >> if (drhd->devices[i]->bus->number == bus &&
> >> --> drhd->devices[0] is NULL
> >> drhd->devices[i]->devfn == devfn)
> >> return drhd->iommu;
> >>
> >>
> >> Given how early this happens it's a little hard to provide logs,
> >> etc. I literally used delay_boot=100 and wrote things down by hand
> >> (forgot my digital camera) and then added printk's to verify).
> >>
> >> please let me know what other data I should collect.
> >
> yes, pls get the call trace. When device_to_iommu() is called, DMAR
> should be already parsed from acpi table and registered, so
> device_to_iommu() should not fail unless it's called earlier than
> DMAR is parsed and registered.
I updated to Linus' latest git (as your description made me wonder if
the async stuff might play a role here). I still get an oops - but at
a different spot and the system no longer hangs - it partly recovers
(but things aren't too well - for example my USB keyboard / mouse don't
work anymore).
Here's the oops:
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.359578] ------------[ cut here ]------------
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.410579] WARNING: at arch/x86/mm/ioremap.c:240 __ioremap_caller+0x150/0x2bd()
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.461578] Hardware name: 7465CTO
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.512578] Modules linked in:
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.614579] Pid: 1, comm: swapper Not tainted 2.6.28 #12
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.665578] Call Trace:
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.767581] [<ffffffff81038b49>] warn_slowpath+0xb1/0xed
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.869580] [<ffffffff81028319>] ? change_page_attr_set_clr+0x13e/0x2e6
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 12.971580] [<ffffffff810275b2>] __ioremap_caller+0x150/0x2bd
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.073581] [<ffffffff81158363>] ? alloc_iommu+0x140/0x181
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.175580] [<ffffffff810277f2>] ioremap_nocache+0x12/0x14
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.277580] [<ffffffff81158363>] alloc_iommu+0x140/0x181
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.379581] [<ffffffff8166a5d6>] dmar_table_init+0x115/0x265
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.481580] [<ffffffff8165687b>] ? pci_iommu_init+0x0/0x17
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.583580] [<ffffffff8166abb1>] intel_iommu_init+0x16/0x8f3
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.685581] [<ffffffff813ce372>] ? mutex_lock+0x11/0x23
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.787581] [<ffffffff813bb9d1>] ? sysctl_net_init+0x1b/0x1f
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.889580] [<ffffffff8165687b>] ? pci_iommu_init+0x0/0x17
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 13.991580] [<ffffffff81656884>] pci_iommu_init+0x9/0x17
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.093581] [<ffffffff81009056>] _stext+0x56/0x12b
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.195581] [<ffffffff81071220>] ? register_irq_proc+0xa3/0xbf
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.297582] [<ffffffff810e0000>] ? proc_coredump_filter_write+0xe0/0xfe
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.399581] [<ffffffff8164e673>] kernel_init+0x139/0x191
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.501581] [<ffffffff8100d27a>] child_rip+0xa/0x20
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.603581] [<ffffffff8164e53a>] ? kernel_init+0x0/0x191
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.705581] [<ffffffff8100d270>] ? child_rip+0x0/0x20
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.756580] ---[ end trace 4eaa2a86a8e2da22 ]---
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.807580] IOMMU: can't map the region
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 14.858580] DMAR:parse DMAR table failure.
later in the log file I find lots of these:
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 40.403251] nommu_map_single: overflow 13a08b248+8 of device mask ffffffff
and finally
Jan 8 17:51:00 dhohndel-mobl4 kernel: [ 66.777166] hub 4-0:1.0: unable to enumerate USB device on port 2
/D
--
Dirk Hohndel
Intel Open Source Technology Center
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