linux-kernel - [PATCH 0/9] iommu: Refactor flush queues into iommu-dma

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Date:   Tue, 23 Nov 2021 14:10:35 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org, will@...nel.org
Cc:     iommu@...ts.linux-foundation.org, suravee.suthikulpanit@....com,
        baolu.lu@...ux.intel.com, willy@...radead.org,
        linux-kernel@...r.kernel.org, john.garry@...wei.com
Subject: [PATCH 0/9] iommu: Refactor flush queues into iommu-dma

Hi all,

As promised, this series cleans up the flush queue code and streamlines
it directly into iommu-dma. Since we no longer have per-driver DMA ops
implementations, a lot of the abstraction is now no longer necessary, so
there's a nice degree of simplification in the process. Un-abstracting
the queued page freeing mechanism is also the perfect opportunity to
revise which struct page fields we use so we can be better-behaved
from the MM point of view, thanks to Matthew.

These changes should also make it viable to start using the gather
freelist in io-pgtable-arm, and eliminate some more synchronous
invalidations from the normal flow there, but that is proving to need a
bit more careful thought than I have time for in this cycle, so I've
parked that again for now and will revisit it in the new year.

For convenience, branch at:
  https://gitlab.arm.com/linux-arm/linux-rm/-/tree/iommu/iova

I've build-tested for x86_64, and boot-tested arm64 to the point of
confirming that put_pages_list() gets passed a valid empty list when
flushing, while everything else still works.

Cheers,
Robin.

Matthew Wilcox (Oracle) (2):
  iommu/amd: Use put_pages_list
  iommu/vt-d: Use put_pages_list

Robin Murphy (7):
  gpu: host1x: Add missing DMA API include
  iommu/iova: Squash entry_dtor abstraction
  iommu/iova: Squash flush_cb abstraction
  iommu/amd: Simplify pagetable freeing
  iommu/iova: Consolidate flush queue code
  iommu/iova: Move flush queue code to iommu-dma
  iommu: Move flush queue data into iommu_dma_cookie

 drivers/gpu/host1x/bus.c       |   1 +
 drivers/iommu/amd/io_pgtable.c | 116 ++++++--------
 drivers/iommu/dma-iommu.c      | 266 +++++++++++++++++++++++++++------
 drivers/iommu/intel/iommu.c    |  89 ++++-------
 drivers/iommu/iova.c           | 200 -------------------------
 include/linux/iommu.h          |   3 +-
 include/linux/iova.h           |  69 +--------
 7 files changed, 295 insertions(+), 449 deletions(-)

-- 
2.28.0.dirty