tree 9ff69be5ade7bb02c85f67a04992986c80c16072
parent d01140df6a32554728ab055f2d82f8028a73d2f5
author Li, Zhen-Hua <zhen-hual@hp.com> 1369036652 +0800
committer Joerg Roedel <joro@8bytes.org> 1371739168 +0200

iommu/vt-d: DMAR reporting table needs at least one DRHD

In intel vt-d spec , chapter 8.1 , DMA Remapping Reporting Structure.
In the end of the table, it says:

Remapping Structures[]
-
A list of structures. The list will contain one or
more DMA Remapping Hardware Unit Definition
(DRHD) structures, and zero or more Reserved
Memory Region Reporting (RMRR) and Root Port
ATS Capability Reporting (ATSR) structures.
These structures are described below.

So, there should be at least one DRHD structure in DMA Remapping
reporting table. If there is no DRHD found, a warning is necessary.

Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>