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powerpc: IOMMU fault injection

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Add the ability to inject IOMMU faults. We enable this per device
via a fail_iommu sysfs property, similar to fault injection on other
subsystems.

An example:

...
0003:01:00.1 Ethernet controller: Emulex Corporation OneConnect 10Gb NIC (be3) (rev 02)

To inject one error to this device:

echo 1 > /sys/bus/pci/devices/0003:01:00.1/fail_iommu
echo 1 > /sys/kernel/debug/fail_iommu/probability
echo 1 > /sys/kernel/debug/fail_iommu/times

As feared, the first failure injected on the be3 results in an
unrecoverable error, taking down both functions of the card
permanently:

be2net 0003:01:00.1: Unrecoverable error in the card

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard
2012-06-24 18:26:17 +00:00
committed by Benjamin Herrenschmidt
parent a980349725
commit d6b9a81b2a
3 changed files with 106 additions and 0 deletions
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3
arch/powerpc/include/asm/device.h
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@@ -34,6 +34,9 @@ struct dev_archdata {
#ifdef CONFIG_EEH
struct eeh_dev *edev;
#endif
#ifdef CONFIG_FAIL_IOMMU
int fail_iommu;
#endif
};
struct pdev_archdata {