linux-kernel - Re: [PATCH RFC 06/11] iommu/sva: Use attach/detach_pasid

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Message-ID: <bdf294e5-b4ed-04dd-1c71-24fada7c9f3d@linux.intel.com>
Date:   Tue, 22 Mar 2022 12:31:38 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 06/11] iommu/sva: Use attach/detach_pasid_dev in SVA
 interfaces

On 2022/3/21 20:05, Jason Gunthorpe wrote:
> On Sun, Mar 20, 2022 at 02:40:25PM +0800, Lu Baolu wrote:
> 
>> +/**
>> + * iommu_sva_bind_device() - Bind a process address space to a device
>> + * @dev: the device
>> + * @mm: the mm to bind, caller must hold a reference to it
>> + * @drvdata: opaque data pointer to pass to bind callback
>> + *
>> + * Create a bond between device and address space, allowing the device to access
>> + * the mm using the returned PASID. If a bond already exists between @device and
>> + * @mm, it is returned and an additional reference is taken. Caller must call
>> + * iommu_sva_unbind_device() to release each reference.
>> + *
>> + * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to
>> + * initialize the required SVA features.
>> + *
>> + * On error, returns an ERR_PTR value.
>> + */
>> +struct iommu_sva *
>> +iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
> The drvdata is never used

Yes. It is cleaned up in Jacob's series.

Best regards,
baolu