mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-01-10 15:10:38 +00:00
21c1f9021f
I/O translation tables on s390 use 8 byte page table entries and tables which are allocated lazily but only freed when the entire I/O translation table is torn down. Also each IOVA can at any time only translate to one physical address Furthermore I/O table accesses by the IOMMU hardware are cache coherent. With a bit of care we can thus use atomic updates to manipulate the translation table without having to use a global lock at all. This is done analogous to the existing I/O translation table handling code used on Intel and AMD x86 systems. Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Link: https://lore.kernel.org/r/20221109142903.4080275-6-schnelle@linux.ibm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>