From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752680AbcKYFO7 (ORCPT ); Fri, 25 Nov 2016 00:14:59 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51930 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751218AbcKYFOU (ORCPT ); Fri, 25 Nov 2016 00:14:20 -0500 From: Baoquan He To: joro@8bytes.org Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, dyoung@redhat.com, xlpang@redhat.com, Baoquan He Subject: [PATCH v7 06/12] iommu: Add is_attach_deferred call-back to iommu-ops Date: Fri, 25 Nov 2016 13:13:13 +0800 Message-Id: <1480050799-1237-7-git-send-email-bhe@redhat.com> In-Reply-To: <1480050799-1237-1-git-send-email-bhe@redhat.com> References: <1480050799-1237-1-git-send-email-bhe@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Fri, 25 Nov 2016 05:13:45 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.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 9a2f196..0262eee 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1083,6 +1083,10 @@ 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; @@ -1124,6 +1128,10 @@ 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 436dc21..e179313 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -200,6 +200,7 @@ 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