iommu/vt-d: Avoid superfluous IOTLB tracking in lazy mode

mainline inclusion
from mainline-v6.3-rc1
commit 16a75bbe
category: bugfix
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8C8B4
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16a75bbe480c3598b3af57a2504ea89b1e32c3ac



-------------------------------------

Intel-SIG: commit 16a75bbe iommu/vt-d: Avoid superfluous IOTLB tracking
in lazy mode
Backport SPR and EMR IOMMU PCIe related upstream bugfixes to kernel 5.10.

Intel IOMMU driver implements IOTLB flush queue with domain selective
or PASID selective invalidations. In this case there's no need to track
IOVA page range and sync IOTLBs, which may cause significant performance
hit.

This patch adds a check to avoid IOVA gather page and IOTLB sync for
the lazy path.

The performance difference on Sapphire Rapids 100Gb NIC is improved by
the following (as measured by iperf send):

w/o this fix~48 Gbits/s. with this fix ~54 Gbits/s

Cc: <stable@vger.kernel.org>
Fixes: 2a2b8eaa ("iommu: Handle freelists when using deferred flushing in iommu drivers")
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Link: https://lore.kernel.org/r/20230209175330.1783556-1-jacob.jun.pan@linux.intel.com


Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
(cherry picked from commit 16a75bbe)
Signed-off-by: Ethan Zhao <haifeng.zhao@linux.intel.com>