From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 23 Apr 2018 12:26:06 +0200 From: Greg Kroah-Hartman To: Jacob Pan Cc: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Alex Williamson , Jean-Philippe Brucker , Rafael Wysocki , "Liu, Yi L" , "Tian, Kevin" , Raj Ashok , Jean Delvare , Christoph Hellwig , Lu Baolu Subject: Re: [PATCH v4 11/22] driver core: add per device iommu param Message-ID: <20180423102606.GA29194@kroah.com> References: <1523915351-54415-1-git-send-email-jacob.jun.pan@linux.intel.com> <1523915351-54415-12-git-send-email-jacob.jun.pan@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1523915351-54415-12-git-send-email-jacob.jun.pan@linux.intel.com> User-Agent: Mutt/1.9.5 (2018-04-13) X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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 > Signed-off-by: Jacob Pan > Signed-off-by: Jean-Philippe Brucker > Link: https://lkml.org/lkml/2017/10/6/81 Reviewed-by: Greg Kroah-Hartman