From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934382AbcKJPh2 (ORCPT ); Thu, 10 Nov 2016 10:37:28 -0500 Received: from 8bytes.org ([81.169.241.247]:60452 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933658AbcKJPh0 (ORCPT ); Thu, 10 Nov 2016 10:37:26 -0500 Date: Thu, 10 Nov 2016 16:37:24 +0100 From: Joerg Roedel To: Eric Auger Cc: eric.auger.pro@gmail.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, tglx@linutronix.de, jason@lakedaemon.net, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, drjones@redhat.com, linux-kernel@vger.kernel.org, pranav.sawargaonkar@gmail.com, iommu@lists.linux-foundation.org, punit.agrawal@arm.com, diana.craciun@nxp.com Subject: Re: [RFC v2 4/8] iommu: Add a list of iommu_reserved_region in iommu_domain Message-ID: <20161110153724.GG2078@8bytes.org> References: <1478258646-3117-1-git-send-email-eric.auger@redhat.com> <1478258646-3117-5-git-send-email-eric.auger@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1478258646-3117-5-git-send-email-eric.auger@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 04, 2016 at 11:24:02AM +0000, Eric Auger wrote: > Introduce a new iommu_reserved_region struct. This embodies > an IOVA reserved region that cannot be used along with the IOMMU > API. The list is protected by a dedicated mutex. > > An iommu domain now owns a list of those. > > Signed-off-by: Eric Auger > > --- > --- > drivers/iommu/iommu.c | 2 ++ > include/linux/iommu.h | 17 +++++++++++++++++ > 2 files changed, 19 insertions(+) > > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > index 9a2f196..0af07492 100644 > --- a/drivers/iommu/iommu.c > +++ b/drivers/iommu/iommu.c > @@ -1061,6 +1061,8 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, > > domain->ops = bus->iommu_ops; > domain->type = type; > + INIT_LIST_HEAD(&domain->reserved_regions); > + mutex_init(&domain->resv_mutex); These regions are a property of the iommu-group, they are specific to a device or a group of devices, not to a particular domain where devics (iommu-groups) can come and go. Further I agree with Robin that this is similar to the get_dm_regions/set_dm_regions approach, which should be changed/extended for this instead of adding something new. Joerg From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: [RFC v2 4/8] iommu: Add a list of iommu_reserved_region in iommu_domain Date: Thu, 10 Nov 2016 16:37:24 +0100 Message-ID: <20161110153724.GG2078@8bytes.org> References: <1478258646-3117-1-git-send-email-eric.auger@redhat.com> <1478258646-3117-5-git-send-email-eric.auger@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: drjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, marc.zyngier-5wv7dgnIgG8@public.gmane.org, punit.agrawal-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, pranav.sawargaonkar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, eric.auger.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org To: Eric Auger Return-path: Content-Disposition: inline In-Reply-To: <1478258646-3117-5-git-send-email-eric.auger-H+wXaHxf7aLQT0dZR+AlfA@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 List-Id: kvm.vger.kernel.org On Fri, Nov 04, 2016 at 11:24:02AM +0000, Eric Auger wrote: > Introduce a new iommu_reserved_region struct. This embodies > an IOVA reserved region that cannot be used along with the IOMMU > API. The list is protected by a dedicated mutex. > > An iommu domain now owns a list of those. > > Signed-off-by: Eric Auger > > --- > --- > drivers/iommu/iommu.c | 2 ++ > include/linux/iommu.h | 17 +++++++++++++++++ > 2 files changed, 19 insertions(+) > > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > index 9a2f196..0af07492 100644 > --- a/drivers/iommu/iommu.c > +++ b/drivers/iommu/iommu.c > @@ -1061,6 +1061,8 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, > > domain->ops = bus->iommu_ops; > domain->type = type; > + INIT_LIST_HEAD(&domain->reserved_regions); > + mutex_init(&domain->resv_mutex); These regions are a property of the iommu-group, they are specific to a device or a group of devices, not to a particular domain where devics (iommu-groups) can come and go. Further I agree with Robin that this is similar to the get_dm_regions/set_dm_regions approach, which should be changed/extended for this instead of adding something new. Joerg From mboxrd@z Thu Jan 1 00:00:00 1970 From: joro@8bytes.org (Joerg Roedel) Date: Thu, 10 Nov 2016 16:37:24 +0100 Subject: [RFC v2 4/8] iommu: Add a list of iommu_reserved_region in iommu_domain In-Reply-To: <1478258646-3117-5-git-send-email-eric.auger@redhat.com> References: <1478258646-3117-1-git-send-email-eric.auger@redhat.com> <1478258646-3117-5-git-send-email-eric.auger@redhat.com> Message-ID: <20161110153724.GG2078@8bytes.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Nov 04, 2016 at 11:24:02AM +0000, Eric Auger wrote: > Introduce a new iommu_reserved_region struct. This embodies > an IOVA reserved region that cannot be used along with the IOMMU > API. The list is protected by a dedicated mutex. > > An iommu domain now owns a list of those. > > Signed-off-by: Eric Auger > > --- > --- > drivers/iommu/iommu.c | 2 ++ > include/linux/iommu.h | 17 +++++++++++++++++ > 2 files changed, 19 insertions(+) > > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > index 9a2f196..0af07492 100644 > --- a/drivers/iommu/iommu.c > +++ b/drivers/iommu/iommu.c > @@ -1061,6 +1061,8 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus, > > domain->ops = bus->iommu_ops; > domain->type = type; > + INIT_LIST_HEAD(&domain->reserved_regions); > + mutex_init(&domain->resv_mutex); These regions are a property of the iommu-group, they are specific to a device or a group of devices, not to a particular domain where devics (iommu-groups) can come and go. Further I agree with Robin that this is similar to the get_dm_regions/set_dm_regions approach, which should be changed/extended for this instead of adding something new. Joerg