From: Bjorn Helgaas <bhelgaas@google.com>
Date: Mon, 20 Jul 2015 14:10:36 +0000 (-0500)
Subject: iommu/vt-d: Cache PCI ATS state and Invalidate Queue Depth
X-Git-Tag: omap-for-v4.3/fixes-merge-window~31^2~3^3~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb0cc3aa552642631c3a4e83deae2b5c1a1ef4fa;p=pandora-kernel.git

iommu/vt-d: Cache PCI ATS state and Invalidate Queue Depth

We check the ATS state (enabled/disabled) and fetch the PCI ATS Invalidate
Queue Depth in performance-sensitive paths.  It's easy to cache these,
which removes dependencies on PCI.

Remember the ATS enabled state.  When enabling, read the queue depth once
and cache it in the device_domain_info struct.  This is similar to what
amd_iommu.c does.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Joerg Roedel <jroedel@suse.de>
---

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