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

Will Deacon will.deacon at arm.com
Wed Nov 12 10:26:43 PST 2014


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



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