From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Date: Thu, 6 Mar 2014 00:54:18 +0000 (-0600)
Subject: iommu/amd: Fix logic to determine and checking max PASID
X-Git-Tag: v3.15-rc1~70^2^3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a919a018cccf999aa56d7f9adeae0525b01b7434;p=pandora-kernel.git

iommu/amd: Fix logic to determine and checking max PASID

In reality, the spec can only support 16-bit PASID since
INVALIDATE_IOTLB_PAGES and COMPLETE_PPR_REQUEST commands only allow 16-bit
PASID. So, we updated the PASID_MASK accordingly and invoke BUG_ON
if the hardware is reporting PASmax more than 16-bit.

Besides, max PASID is defined as ((2^(PASmax+1)) - 1). The current does not
determine this correctly.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Tested-by: Jay Cornwall <Jay.Cornwall@amd.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
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