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    SubjectRe: [RFC 04/20] iommu: Add iommu_device_get_info interface
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    On 2021/9/29 17:25, Lu Baolu wrote:
    > 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@linux.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/

    And Christoph gave another option as well.

    https://lore.kernel.org/linux-iommu/20210922050746.GA12921@lst.de/

    Best regards,
    baolu

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