RHEL9: Update to iova management code

Merge Request Required Information

JIRA: https://issues.redhat.com/browse/RHEL-11148

Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git - next branch

Tested: Tested on Genoa system under I/O stress with fio, and tested by 2 customers that reported issues.

Summary of Changes

This updates the iova management code to scale the rcache depot based on workload. The current implementation has run into problems on large cpu systems like the Genoa with soft lockups occurring under load due to contention for the iova rbtree lock.

Robin extends the current implementation to incorporate the idea put forward in the original USENIX paper of the depot being an unbounded list of full magazines, rather than a fixed array.

Signed-off-by: Jerry Snitselaar jsnitsel@redhat.com

Approved Development Ticket

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