[PATCH v2] powerpc/npu: Cleanup MMIO ATSD flushing

[Michael Ellerman]

Alistair Popple <alistair at popple.id.au> writes:

>> @aneesh can you please look at this? @mpe can we pick this up if there
>> are no objections?
>
> @mpe any objections to picking this up for this release? Or do you want to wait
> for the next one? (there are likely more bugfixes coming for ATS support).

I can grab it for this release if it's fixing a bug, the subject makes
it sound like a cleanup. Do we have a Fixes tag for it?

I don't particularly like the potentially very long loop in
pnv_npu2_invalidate_helper() which spends most of its time with
interrupts off. I worry we're going to see soft lockups pointing there
if we get a very large invalidate.

cheers