Re: hpsa driver bug crack kernel down!

["Woodhouse, David" <david.woodhouse@intel.com>]

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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;
 }
 


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





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