linux-kernel - Re: [RFC 04/20] iommu: Add iommu_device_get

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Date:   Wed, 29 Sep 2021 17:25:18 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     David Gibson <david@...son.dropbear.id.au>,
        Liu Yi L <yi.l.liu@...el.com>
Cc:     baolu.lu@...ux.intel.com, alex.williamson@...hat.com,
        jgg@...dia.com, hch@....de, jasowang@...hat.com, joro@...tes.org,
        jean-philippe@...aro.org, kevin.tian@...el.com, parav@...lanox.com,
        lkml@...ux.net, pbonzini@...hat.com, lushenming@...wei.com,
        eric.auger@...hat.com, corbet@....net, ashok.raj@...el.com,
        yi.l.liu@...ux.intel.com, jun.j.tian@...el.com, hao.wu@...el.com,
        dave.jiang@...el.com, jacob.jun.pan@...ux.intel.com,
        kwankhede@...dia.com, robin.murphy@....com, kvm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
        linux-kernel@...r.kernel.org, nicolinc@...dia.com
Subject: Re: [RFC 04/20] iommu: Add iommu_device_get_info interface

Hi David,

On 2021/9/29 10:52, David Gibson wrote:
> On Sun, Sep 19, 2021 at 02:38:32PM +0800, Liu Yi L wrote:
>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>>
>> This provides an interface for upper layers to get the per-device iommu
>> attributes.
>>
>>      int iommu_device_get_info(struct device *dev,
>>                                enum iommu_devattr attr, void *data);
> That fact that this interface doesn't let you know how to size the
> data buffer, other than by just knowing the right size for each attr
> concerns me.
> 

We plan to address this by following the comments here.

https://lore.kernel.org/linux-iommu/20210921161930.GP327412@nvidia.com/

Best regards,
baolu