vfio: Replace the iommu notifier with a device list

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Instead of bouncing the function call to the driver op through a blocking
notifier just have the iommu layer call it directly.

Register each device that is being attached to the iommu with the lower
driver which then threads them on a linked list and calls the appropriate
driver op at the right time.

Currently the only use is if dma_unmap() is defined.

Also, fully lock all the debugging tests on the pinning path that a
dma_unmap is registered.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/2-v4-681e038e30fd+78-vfio_unmap_notif_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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This commit is contained in:

Jason Gunthorpe 2022-07-19 21:02:49 -03:00 • committed by Alex Williamson

parent ce4b4657ff

commit 8cfc5b6075

4 changed files with 81 additions and 77 deletions

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41

drivers/vfio/vfio.c

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12

drivers/vfio/vfio.h

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103

drivers/vfio/vfio_iommu_type1.c

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2

include/linux/vfio.h

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