iommu: Indicate queued flushes via gather data

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Since iommu_iotlb_gather exists to help drivers optimise flushing for a
given unmap request, it is also the logical place to indicate whether
the unmap is strict or not, and thus help them further optimise for
whether to expect a sync or a flush_all subsequently. As part of that,
it also seems fair to make the flush queue code take responsibility for
enforcing the really subtle ordering requirement it brings, so that we
don't need to worry about forgetting that if new drivers want to add
flush queue support, and can consolidate the existing versions.

While we're adding to the kerneldoc, also fill in some info for
@freelist which was overlooked previously.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/bf5f8e2ad84e48c712ccbf80fa8c610594c7595f.1628682049.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Robin Murphy 2021-08-11 13:21:28 +01:00 • committed by Joerg Roedel

parent 8d971243a9

commit 7a7c5badf8

3 changed files with 15 additions and 1 deletions

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1

drivers/iommu/dma-iommu.c

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7

drivers/iommu/iova.c

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8

include/linux/iommu.h

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