linux-kernel - RE: [PATCH v9 07/11] iommu/sva: Refactoring iommu_sva_bind/unbind

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Message-ID: <BN9PR11MB5276EBFC3D990EA8EDEDF8C38CB89@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 28 Jun 2022 08:52:37 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Jiang, Dave" <dave.jiang@...el.com>, Vinod Koul <vkoul@...nel.org>
CC:     Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v9 07/11] iommu/sva: Refactoring
 iommu_sva_bind/unbind_device()

> From: Baolu Lu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, June 28, 2022 1:54 PM
> >> +u32 iommu_sva_get_pasid(struct iommu_sva *handle)
> >> +{
> >> +	struct iommu_domain *domain =
> >> +			container_of(handle, struct iommu_domain, bond);
> >> +
> >> +	return domain->mm->pasid;
> >> +}
> >> +EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);
> >
> > Looks this is only used by unbind_device. Just open code it.
> 
> It's part of current IOMMU/SVA interfaces for the device drivers, and
> has been used in various drivers.
> 
> $ git grep iommu_sva_get_pasid
> drivers/dma/idxd/cdev.c:                pasid = iommu_sva_get_pasid(sva);
> drivers/iommu/iommu-sva-lib.c:  ioasid_t pasid =
> iommu_sva_get_pasid(handle);
> drivers/iommu/iommu-sva-lib.c:u32 iommu_sva_get_pasid(struct
> iommu_sva
> *handle)
> drivers/iommu/iommu-sva-
> lib.c:EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);
> drivers/misc/uacce/uacce.c:     pasid = iommu_sva_get_pasid(handle);
> include/linux/iommu.h:u32 iommu_sva_get_pasid(struct iommu_sva
> *handle);
> include/linux/iommu.h:static inline u32 iommu_sva_get_pasid(struct
> iommu_sva *handle)
> 
> Or, I missed anything?
> 

Forget it. I thought it's a new function introduced in this series. :/