From 4e28784024a0d87f6f04250e46e8c9ac4f30e361 Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Date: Thu, 23 Oct 2014 19:19:35 -0200
Subject: [PATCH] powernv/iommu: disable IOMMU bypass with param iommu=nobypass

When IOMMU bypass is enabled, a PCI device can read and write memory
that was not mapped by the driver without causing an EEH. That might
cause memory corruption, for example.

When we disable bypass, DMA reads and writes to addresses not mapped by
the IOMMU will cause an EEH, allowing us to debug such issues.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
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