mainline inclusion
from linux-next
commit: 14bd9a607f9082e7b5690c27e69072f2aeae0de4
category: feature
feature: IOMMU performance
bugzilla: NA
CVE: NA

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

In struct iova_domain, there are three atomic variables, the former two
are about TLB flush counters which use atomic_add operation, anoter is
used to flush timer that use cmpxhg operation.
These variables are in the same cache line, so it will cause some
performance loss under the condition that many cores call queue_iova
function, Let's isolate the two type atomic variables to different
cache line to reduce cache line conflict.

Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: NJinyu Qi <jinyuqi@huawei.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>
Signed-off-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>