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
