Public bug reported:
Description
Under terminal conditions when drivers require to reset their devices, they
need to ensure that page request processing is flushed and restarted after the
device is completed processing the reset.
Drivers need a mechanism to stop page requests, and start page request
processing.
Need 2 new interfaces:
intel_svm_suspend_prs_processing() - it can take some flags to indicate if this
indicates all PASID's for this device? or just a specific PASID. Any Page
Request that comes will be dropped and not processed by IOMMU SVM code.
Consider having any stats on per device or per pasid to indicate how many were
dropped during this period. and facility to clear stats?
intel_svm_drain_prs_processing() This call will block, until a drain desc is
complete, also should ensure that any request that have been pushed to the page
queue should be dropped before returning back to caller.
Target Release: 20.04
Target Kernel: TBD
** Affects: intel
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: intel-kernel-20.04
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1843491
Title:
IOMMU SVM requires PRQ_DRAIN function implemented.
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