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SubjectRe: [PATCH RFC 11/14] arm64: Move the ASID allocator code in a separate file
Thx Will,

On Mon, Jun 24, 2019 at 6:40 PM Will Deacon <will@kernel.org> wrote:
> > I'll keep my system use the same ASID for SMP + IOMMU :P
>
> You will want a separate allocator for that:
>
> https://lkml.kernel.org/r/20190610184714.6786-2-jean-philippe.brucker@arm.com

Yes, it is hard to maintain ASID between IOMMU and CPUMMU or different
system, because it's difficult to synchronize the IO_ASID when the CPU
ASID is rollover.
But we could still use hardware broadcast TLB invalidation instruction
to uniformly manage the ASID and IO_ASID, or OTHER_ASID in our IOMMU.

Welcome to join our disscusion:
"Introduce an implementation of IOMMU in linux-riscv"
9 Sep 2019, 10:45 Jade-room-I&II (Corinthia Hotel Lisbon) RISC-V MC

--
Best Regards
Guo Ren

ML: https://lore.kernel.org/linux-csky/

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