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

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Date:   Fri, 23 Mar 2018 09:12:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        Lan Tianyu <tianyu.lan@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean Delvare <khali@...ux-fr.org>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v4 11/22] driver core: add per device iommu param

On Thu, Mar 22, 2018 at 08:12:03PM -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@...uxfoundation.org>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@....com>
> Link: https://lkml.org/lkml/2017/10/6/81

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>