From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Auger Subject: [RFC v2 4/8] iommu: Add a list of iommu_reserved_region in iommu_domain Date: Fri, 4 Nov 2016 11:24:02 +0000 Message-ID: <1478258646-3117-5-git-send-email-eric.auger@redhat.com> References: <1478258646-3117-1-git-send-email-eric.auger@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1478258646-3117-1-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 To: eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, eric.auger.pro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, marc.zyngier-5wv7dgnIgG8@public.gmane.org, robin.murphy-5wv7dgnIgG8@public.gmane.org, alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Cc: drjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, punit.agrawal-5wv7dgnIgG8@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, pranav.sawargaonkar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org List-Id: iommu@lists.linux-foundation.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