iommu: Handle freelists when using deferred flushing in iommu drivers

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Allow the iommu_unmap_fast to return newly freed page table pages and
pass the freelist to queue_iova in the dma-iommu ops path.

This is useful for iommu drivers (in this case the intel iommu driver)
which need to wait for the ioTLB to be flushed before newly
free/unmapped page table pages can be freed. This way we can still batch
ioTLB free operations and handle the freelists.

Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Logan Gunthorpe <logang@deltatee.com>
Link: https://lore.kernel.org/r/20201124082057.2614359-2-baolu.lu@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>

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Tom Murphy 2020-11-24 16:20:51 +08:00 • committed by Will Deacon

parent 66930e7e1e

commit 2a2b8eaa5b

3 changed files with 58 additions and 27 deletions

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29

drivers/iommu/dma-iommu.c

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55

drivers/iommu/intel/iommu.c

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1

include/linux/iommu.h

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