Re: [PATCH v4 11/22] driver core: add per device iommu param

[Greg Kroah-Hartman]

On Mon, Apr 16, 2018 at 02:49:00PM -0700, Jacob Pan wrote:
> DMA faults can be detected by IOMMU at device level. Adding a pointer
> to struct device allows IOMMU subsystem to report relevant faults
> back to the device driver for further handling.
> For direct assigned device (or user space drivers), guest OS holds
> responsibility to handle and respond per device IOMMU fault.
> Therefore we need fault reporting mechanism to propagate faults beyond
> IOMMU subsystem.
> 
> There are two other IOMMU data pointers under struct device today, here
> we introduce iommu_param as a parent pointer such that all device IOMMU
> data can be consolidated here. The idea was suggested here by Greg KH
> and Joerg. The name iommu_param is chosen here since iommu_data has been used.
> 
> Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
> Link: https://lkml.org/lkml/2017/10/6/81

Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>