Re: [RFC 04/20] iommu: Add iommu_device_get_info interface

[Lu Baolu]

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@xxxxxxxxxxxxxxx>
> >
> > 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@xxxxxxxxxx/

Best regards,
baolu