iommu/vt-d: Check FL and SL capability sanity in scalable mode

[ Upstream commit 7afd7f6a ]

An iommu domain could be allocated and mapped before it's attached to any
device. This requires that in scalable mode, when the domain is allocated,
the format (FL or SL) of the page table must be determined. In order to
achieve this, the platform should support consistent SL or FL capabilities
on all IOMMU's. This adds a check for this and aborts IOMMU probing if it
doesn't meet this requirement.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20210926114535.923263-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20211014053839.727419-5-baolu.lu@linux.intel.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>
Stable-dep-of: 257ec290 ("iommu/vt-d: Allow to use flush-queue when first level is default")
Signed-off-by: Sasha Levin <sashal@kernel.org>