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Date: Mon, 18 Dec 2017 15:37:53 +0100
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: iommu@lists.linux-foundation.org, LKML <linux-kernel@vger.kernel.org>,
        Joerg Roedel <joro@8bytes.org>, David Woodhouse <dwmw2@infradead.org>,
        Rafael Wysocki <rafael.j.wysocki@intel.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        "Liu, Yi L" <yi.l.liu@intel.com>, Lan Tianyu <tianyu.lan@intel.com>,
        "Tian, Kevin" <kevin.tian@intel.com>, Raj Ashok <ashok.raj@intel.com>,
        Jean Delvare <khali@linux-fr.org>,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v3 09/16] driver core: add iommu device fault reporting
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Message-ID: <20171218143753.GA14211@kroah.com>
References: <1510944914-54430-1-git-send-email-jacob.jun.pan@linux.intel.com>
 <1510944914-54430-10-git-send-email-jacob.jun.pan@linux.intel.com>
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On Fri, Nov 17, 2017 at 10:55:07AM -0800, 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@linuxfoundation.org>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> Link: https://lkml.org/lkml/2017/10/6/81

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