Messages in this thread | | | Subject | Re: [RFC 04/20] iommu: Add iommu_device_get_info interface | From | Lu Baolu <> | Date | Wed, 29 Sep 2021 17:29:17 +0800 |
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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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