iommu: Add recoverable fault reporting

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Some IOMMU hardware features, for example PCI PRI and Arm SMMU Stall,
enable recoverable I/O page faults. Allow IOMMU drivers to report PRI Page
Requests and Stall events through the new fault reporting API. The
consumer of the fault can be either an I/O page fault handler in the host,
or a guest OS.

Once handled, the fault must be completed by sending a page response back
to the IOMMU. Add an iommu_page_response() function to complete a page
fault.

There are two ways to extend the userspace API:
* Add a field to iommu_page_response and a flag to
  iommu_page_response::flags describing the validity of this field.
* Introduce a new iommu_page_response_X structure with a different version
  number. The kernel must then support both versions.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

...

This commit is contained in:

Jean-Philippe Brucker 2019-06-03 15:57:49 +01:00 • committed by Joerg Roedel

parent 0c830e6b32

commit bf3255b3cf

3 changed files with 146 additions and 2 deletions

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94

drivers/iommu/iommu.c

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19

include/linux/iommu.h

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35

include/uapi/linux/iommu.h

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