linux-kernel - RE: [PATCH v4 0/5] iommu/vt-d: Add page request draining support

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Date:   Thu, 7 May 2020 06:38:42 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>
CC:     "Raj, Ashok" <ashok.raj@...el.com>,
        "jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 0/5] iommu/vt-d: Add page request draining support

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Thursday, May 7, 2020 8:55 AM
> 
> 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 chapter 7.10 in the VT-d
> specification specifies the software steps to drain pending page
> requests and responses.
> 
> This includes two parts:
>  - PATCH 1/4 ~ 2/4: refactor the qi_submit_sync() to support multiple
>    descriptors per submission which will be used in the following
>    patch.
>  - PATCH 3/4 ~ 4/4: add page request drain support after a pasid entry
>    is torn down.
> 

I think you should mention that this series depends on Jacob's nested
SVA series.

> Best regards,
> baolu
> 
> Change log:
> v3->v4:
>   - Remove prq drain in mm notifier;
>   - Set PASID FPD bit when pasid is cleared in mm notifier and clear
>     it in unbound().
> 
>  v2->v3:
>   - Address Kevin's review comments
>     - Squash the first 2 patches together;
>     - The prq thread is serialized, no need to consider reentrance;
>     - Ensure no new-coming prq before drain prq in queue;
>     - Handle page request overflow case.
> 
>  v1->v2:
>   - Fix race between multiple prq handling threads.
> 
> Lu Baolu (5):
>   iommu/vt-d: Multiple descriptors per qi_submit_sync()
>   iommu/vt-d: debugfs: Add support to show inv queue internals
>   iommu/vt-d: Disable non-recoverable fault processing before unbind
>   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-iommu.c         |   4 +-
>  drivers/iommu/intel-pasid.c         |  30 +++++--
>  drivers/iommu/intel-pasid.h         |   3 +-
>  drivers/iommu/intel-svm.c           | 123 ++++++++++++++++++++++++----
>  drivers/iommu/intel_irq_remapping.c |   2 +-
>  include/linux/intel-iommu.h         |  13 ++-
>  8 files changed, 247 insertions(+), 53 deletions(-)
> 
> --
> 2.17.1