linux-kernel - Re: [PATCH v7 0/4] Re-enable IDXD kernel workqueue under DMA API

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Date:   Wed, 31 May 2023 21:33:42 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     LKML <linux-kernel@...r.kernel.org>, iommu@...ts.linux.dev,
        Jason Gunthorpe <jgg@...dia.com>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Robin Murphy" <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        dmaengine@...r.kernel.org, vkoul@...nel.org
Cc:     "Will Deacon" <will@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        narayan.ranganathan@...el.com, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v7 0/4] Re-enable IDXD kernel workqueue under DMA API

Hi Jason,

Do you have any comments on this set? this is a follow-up of the IOASID
removal series.

Thanks a lot for your time.

Jacob

On Tue, 23 May 2023 10:34:47 -0700, Jacob Pan
<jacob.jun.pan@...ux.intel.com> wrote:

> Hi Joerg and all,
> 
> IDXD kernel work queues were disabled due to the flawed use of kernel VA
> and SVA API.
> Link:
> https://lore.kernel.org/linux-iommu/20210511194726.GP1002214@nvidia.com/
> 
> The solution is to enable it under DMA API where IDXD shared workqueue
> users can use ENQCMDS to submit work on buffers mapped by DMA API.
> 
> This patchset adds support for attaching PASID to the device's default
> domain and the ability to allocate global PASIDs from IOMMU APIs. IDXD
> driver can then re-enable the kernel work queues and use them under DMA
> API.
> 
> This depends on the IOASID removal series. (merged)
> https://lore.kernel.org/all/ZCaUBJvUMsJyD7EW@8bytes.org/
> 
> 
> Thanks,
> 
> Jacob
> 
> ---
> Changelog:
> v7:
> 	- renamed IOMMU_DEF_RID_PASID to be IOMMU_NO_PASID to be more
> generic (Jean)
> 	- simplify range checking for sva PASID (Baolu) 
> v6:
> 	- use a simplified version of vt-d driver change for
> set_device_pasid from Baolu.
> 	- check and rename global PASID allocation base
> v5:
> 	- exclude two patches related to supervisor mode, taken by VT-d
> 	maintainer Baolu.
> 	- move PASID range check into allocation API so that device
> drivers only need to pass in struct device*. (Kevin)
> 	- factor out helper functions in device-domain attach (Baolu)
> 	- make explicit use of RID_PASID across architectures
> v4:
> 	- move dummy functions outside ifdef CONFIG_IOMMU_SVA (Baolu)
> 	- dropped domain type check while disabling idxd system PASID
> (Baolu)
> 
> v3:
> 	- moved global PASID allocation API from SVA to IOMMU (Kevin)
> 	- remove #ifdef around global PASID reservation during boot
> (Baolu)
> 	- remove restriction on PASID 0 allocation (Baolu)
> 	- fix a bug in sysfs domain change when attaching devices
> 	- clear idxd user interrupt enable bit after disabling device(
> Fenghua) v2:
> 	- refactored device PASID attach domain ops based on Baolu's
> early patch
> 	- addressed TLB flush gap
> 	- explicitly reserve RID_PASID from SVA PASID number space
> 	- get dma domain directly, avoid checking domain types
> 
> 
> 
> Jacob Pan (3):
>   iommu: Generalize PASID 0 for normal DMA w/o PASID
>   iommu: Move global PASID allocation from SVA to core
>   dmaengine/idxd: Re-enable kernel workqueue under DMA API
> 
> Lu Baolu (1):
>   iommu/vt-d: Add set_dev_pasid callback for dma domain
> 
>  drivers/dma/idxd/device.c                     |  30 +---
>  drivers/dma/idxd/dma.c                        |   5 +-
>  drivers/dma/idxd/init.c                       |  60 ++++++-
>  drivers/dma/idxd/sysfs.c                      |   7 -
>  .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |   2 +-
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   |  10 +-
>  drivers/iommu/intel/iommu.c                   | 159 +++++++++++++++---
>  drivers/iommu/intel/iommu.h                   |   7 +
>  drivers/iommu/intel/pasid.c                   |   2 +-
>  drivers/iommu/intel/pasid.h                   |   1 -
>  drivers/iommu/iommu-sva.c                     |  28 ++-
>  drivers/iommu/iommu.c                         |  24 +++
>  include/linux/iommu.h                         |  11 ++
>  13 files changed, 261 insertions(+), 85 deletions(-)
> 


Thanks,

Jacob