On 23/06/2017 10:58, Robin Murphy wrote:
On 23/06/17 09:47, John Garry wrote:
On 22/06/2017 16:53, Robin Murphy wrote:
The feedback has been promising, so v2 is just a final update to cover
a handful of memory ordering and cosmetic tweaks that came up when Will
and I went through this offline.
Thanks,
Robin.
Hi Robin,
Is it worth us retesting this patchset?
If yes, as for a branch (for convenience), does this one now match v2:
git://linux-arm.org/linux-rm iommu/pgtable
I saw it was rewritten recently.
Indeed, I pushed the branch out before posting. Functionally it ought to
be identical to v1, so this was more just a heads-up - feel free to
double-check I've not broken anything, but I wouldn't say you need to
throw the full test lab at it again.
I saw Will has already sent the pull request. But, FWIW, we are seeing
roughly the same performance as v1 patchset. For PCI NIC, Zhou again
found performance drop goes from ~15->8% with SMMU enabled, and for
integrated storage controller [platform device], we still see a drop of
about 50%, depending on datarates (Leizhen has been working on fixing this).
John
Thanks,
Robin.
Thanks,
John
Robin Murphy (8):
iommu/io-pgtable-arm-v7s: Check table PTEs more precisely
iommu/io-pgtable-arm: Improve split_blk_unmap
iommu/io-pgtable-arm-v7s: Refactor split_blk_unmap
iommu/io-pgtable: Introduce explicit coherency
iommu/io-pgtable-arm: Support lockless operation
iommu/io-pgtable-arm-v7s: Support lockless operation
iommu/arm-smmu: Remove io-pgtable spinlock
iommu/arm-smmu-v3: Remove io-pgtable spinlock
drivers/iommu/arm-smmu-v3.c | 36 ++-----
drivers/iommu/arm-smmu.c | 48 ++++------
drivers/iommu/io-pgtable-arm-v7s.c | 179
+++++++++++++++++++++-------------
drivers/iommu/io-pgtable-arm.c | 191
++++++++++++++++++++++++-------------
drivers/iommu/io-pgtable.h | 6 ++
5 files changed, 274 insertions(+), 186 deletions(-)
.
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