From mboxrd@z Thu Jan 1 00:00:00 1970 From: Baoquan He Subject: [PATCH v9 08/13] iommu: Add is_attach_deferred call-back to iommu-ops Date: Tue, 1 Aug 2017 19:37:24 +0800 Message-ID: <1501587449-9817-9-git-send-email-bhe@redhat.com> References: <1501587449-9817-1-git-send-email-bhe@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1501587449-9817-1-git-send-email-bhe-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: jroedel-l3A5Bk7waGM@public.gmane.org Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: iommu@lists.linux-foundation.org This new call-back will be used to check if the domain attach need be deferred for now. If yes, the domain attach/detach will return directly. Signed-off-by: Baoquan He --- drivers/iommu/iommu.c | 8 ++++++++ include/linux/iommu.h | 1 + 2 files changed, 9 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 3f6ea160afed..86581b115b92 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1283,6 +1283,10 @@ static int __iommu_attach_device(struct iommu_domain *domain, struct device *dev) { int ret; + if ((domain->ops->is_attach_deferred != NULL) && + domain->ops->is_attach_deferred(domain, dev)) + return 0; + if (unlikely(domain->ops->attach_dev == NULL)) return -ENODEV; @@ -1324,6 +1328,10 @@ EXPORT_SYMBOL_GPL(iommu_attach_device); static void __iommu_detach_device(struct iommu_domain *domain, struct device *dev) { + if ((domain->ops->is_attach_deferred != NULL) && + domain->ops->is_attach_deferred(domain, dev)) + return; + if (unlikely(domain->ops->detach_dev == NULL)) return; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 2cb54adc4a33..63983c9e6c3a 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -225,6 +225,7 @@ struct iommu_ops { u32 (*domain_get_windows)(struct iommu_domain *domain); int (*of_xlate)(struct device *dev, struct of_phandle_args *args); + bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev); unsigned long pgsize_bitmap; }; -- 2.5.5