From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933170AbcKCVkK (ORCPT ); Thu, 3 Nov 2016 17:40:10 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39224 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933120AbcKCVkH (ORCPT ); Thu, 3 Nov 2016 17:40:07 -0400 From: Eric Auger To: eric.auger@redhat.com, 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, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, linux-arm-kernel@lists.infradead.org Cc: 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: [RFC 4/8] iommu: Add a list of iommu_reserved_region in iommu_domain Date: Thu, 3 Nov 2016 21:39:34 +0000 Message-Id: <1478209178-3009-5-git-send-email-eric.auger@redhat.com> In-Reply-To: <1478209178-3009-1-git-send-email-eric.auger@redhat.com> References: <1478209178-3009-1-git-send-email-eric.auger@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 03 Nov 2016 21:40:07 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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); /* Assume all sizes by default; the driver may override this later */ domain->pgsize_bitmap = bus->iommu_ops->pgsize_bitmap; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 436dc21..0f2eb64 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -84,6 +84,8 @@ struct iommu_domain { void *handler_token; struct iommu_domain_geometry geometry; void *iova_cookie; + struct list_head reserved_regions; + struct mutex resv_mutex; /* protects the reserved region list */ }; enum iommu_cap { @@ -131,6 +133,21 @@ struct iommu_dm_region { int prot; }; +/** + * struct iommu_reserved_region - descriptor for a reserved iova region + * @list: Linked list pointers + * @start: IOVA base address of the region + * @length: Length of the region in bytes + */ +struct iommu_reserved_region { + struct list_head list; + dma_addr_t start; + size_t length; +}; + +#define iommu_reserved_region_for_each(resv, d) \ + list_for_each_entry(resv, &(d)->reserved_regions, list) + #ifdef CONFIG_IOMMU_API /** -- 1.9.1