Re: [PATCH 5/6] iommu/arm-smmu: support buggy implementations with invalidate-on-map

Will Deacon
2014-11-12T18:26:43Z

Hi Mitch,

On Wed, Aug 13, 2014 at 01:51:38AM +0100, Mitchel Humpherys wrote:
> Add a workaround for some buggy hardware that requires a TLB invalidate
> operation to occur at map time. Activate the feature with the
> qcom,smmu-invalidate-on-map boolean DT property.

I'm digging up an old thread here, but I've been working on a new page-table
allocator for the SMMU and looked into implementing this workaround for you
in there. When I do the TLBI on map after installing the new PTE, can I just
invalidate the range mapped by that PTE, or does it need to be a full TLBI?

Will