linux-kernel - Re: hpsa driver bug crack kernel down!

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Date:	Fri, 11 Apr 2014 09:18:53 +0000
From:	"Woodhouse, David" <david.woodhouse@...el.com>
To:	Davidlohr Bueso <davidlohr@...com>
CC:	"joro@...tes.org" <joro@...tes.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"bhe@...hat.com" <bhe@...hat.com>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"James.Bottomley@...senpartnership.com" 
	<James.Bottomley@...senpartnership.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"scameron@...rdog.cce.hp.com" <scameron@...rdog.cce.hp.com>
Subject: Re: hpsa driver bug crack kernel down!

On Thu, 2014-04-10 at 09:19 -0700, Davidlohr Bueso wrote:
> Attaching a dmesg from one of the kernels that boots. It doesn't appear
> to have much of the related information... is there any debug config
> option I can enable that might give you more data?

I'd like the contents of /sys/firmware/acpi/tables/DMAR please. And
please could you also apply this patch to both the last-working and
first-failing kernels and show me the output in both cases?

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index dd576c0..d52ac03 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -683,6 +683,12 @@ static struct intel_iommu *device_to_iommu(int segment, u8 bus, u8 devfn)
 out:
 	rcu_read_unlock();
 
+	if (iommu)
+		printk("Device %x:%02x:%02x.%d on IOMMU at %llx\n", segment, bus,
+		       PCI_SLOT(devfn), PCI_FUNC(devfn), drhd->reg_base_addr);
+	else
+		printk("Device %x:%02x:%02x.%d on no IOMMU\n", segment, bus,
+		       PCI_SLOT(devfn), PCI_FUNC(devfn));
 	return iommu;
 }
 


-- 
                  Sent with Evolution's ActiveSync support.

David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation





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