When a PASID is stopped or terminated, there can be pending PRQs (requests that haven't received responses) in the software and remapping hardware. The pending page requests must be drained so that the pasid could be reused. The register level interface for page request draining is defined in 7.11 of the VT-d spec. This series adds the support for page requests draining.
This includes two parts: - PATCH 1/7 ~ 3/7: refactor the qi_submit_sync() to support multiple descriptors per submission which will be used by PATCH 6/7. - PATCH 4/7 ~ 7/7: add page request drain support after a pasid entry is torn down due to an unbind operation. Please help to review. Best regards, baolu Change log: v1->v2: - Fix race between multiple prq handling threads Lu Baolu (7): iommu/vt-d: Refactor parameters for qi_submit_sync() iommu/vt-d: Multiple descriptors per qi_submit_sync() iommu/vt-d: debugfs: Add support to show inv queue internals iommu/vt-d: Refactor prq_event_thread() iommu/vt-d: Save prq descriptors in an internal list iommu/vt-d: Add page request draining support iommu/vt-d: Remove redundant IOTLB flush drivers/iommu/dmar.c | 63 +++-- drivers/iommu/intel-iommu-debugfs.c | 62 +++++ drivers/iommu/intel-pasid.c | 4 +- drivers/iommu/intel-svm.c | 383 ++++++++++++++++++---------- drivers/iommu/intel_irq_remapping.c | 2 +- include/linux/intel-iommu.h | 12 +- 6 files changed, 369 insertions(+), 157 deletions(-) -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
