From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: Re: [PATCH v4 11/22] driver core: add per device iommu param Date: Fri, 23 Mar 2018 09:12:09 +0100 Message-ID: <20180323081209.GA27808@kroah.com> References: <1521774734-48433-1-git-send-email-jacob.jun.pan@linux.intel.com> <1521774734-48433-12-git-send-email-jacob.jun.pan@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1521774734-48433-12-git-send-email-jacob.jun.pan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Jacob Pan Cc: Lan Tianyu , Raj Ashok , Rafael Wysocki , LKML , iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Jean Delvare , David Woodhouse List-Id: iommu@lists.linux-foundation.org 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 > Signed-off-by: Jacob Pan > Signed-off-by: Jean-Philippe Brucker > Link: https://lkml.org/lkml/2017/10/6/81 Acked-by: Greg Kroah-Hartman From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 23 Mar 2018 09:12:09 +0100 From: Greg Kroah-Hartman To: Jacob Pan Cc: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Jean-Philippe Brucker , Rafael Wysocki , "Liu, Yi L" , Lan Tianyu , "Tian, Kevin" , Raj Ashok , Alex Williamson , Jean Delvare , Christoph Hellwig Subject: Re: [PATCH v4 11/22] driver core: add per device iommu param Message-ID: <20180323081209.GA27808@kroah.com> References: <1521774734-48433-1-git-send-email-jacob.jun.pan@linux.intel.com> <1521774734-48433-12-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: <1521774734-48433-12-git-send-email-jacob.jun.pan@linux.intel.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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 > Signed-off-by: Jacob Pan > Signed-off-by: Jean-Philippe Brucker > Link: https://lkml.org/lkml/2017/10/6/81 Acked-by: Greg Kroah-Hartman