[PATCH 1/2] iommu/io-pgtable-arm: Convert to IOMMU API TLB sync

[Robin Murphy]

On 27/09/17 13:27, Joerg Roedel wrote:
> Hi Will, Robin,
> 
> On Fri, Sep 22, 2017 at 04:43:22PM +0100, Will Deacon wrote:
>> Joerg, do you reckon it's worth merging this as-is, or should we also
>> hook up add_flush before implementing this?
> 
> The patches implement .iotlb_sync() so that it is okay to not have a
> .iotlb_range_add() call-back for now. But the patches lack a
> .flush_iotlb_range() call-back, which is strictly necessary for
> correctness because it is defined to be synchronous and doesn't require
> a sync-call afterwards.

Good point - even with the flush still implicit in the unmap, an
iommu_unmap_fast()/iommu_flush_iotlb_all() sequence would indeed be
missing a sync at the end. I'll fix that up and post a new version shortly.

Thanks,
Robin.