From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B134EC433ED for ; Mon, 10 May 2021 14:25:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9364C611BD for ; Mon, 10 May 2021 14:25:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235714AbhEJO07 (ORCPT ); Mon, 10 May 2021 10:26:59 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:2756 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235161AbhEJOXq (ORCPT ); Mon, 10 May 2021 10:23:46 -0400 Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4Ff38H6410zqTrx; Mon, 10 May 2021 22:19:11 +0800 (CST) Received: from localhost.localdomain (10.69.192.58) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.498.0; Mon, 10 May 2021 22:22:25 +0800 From: John Garry To: , , , , CC: , , , , , , John Garry Subject: [PATCH v2 04/15] iommu: Add iommu_group_get_max_opt_dma_size() Date: Mon, 10 May 2021 22:17:18 +0800 Message-ID: <1620656249-68890-5-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1620656249-68890-1-git-send-email-john.garry@huawei.com> References: <1620656249-68890-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.58] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a function to return the max optimised DMA size for an IOMMU group. Signed-off-by: John Garry --- drivers/iommu/iommu.c | 5 +++++ include/linux/iommu.h | 6 ++++++ 2 files changed, 11 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 63cdfb11ebed..62e4491f32e0 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2296,6 +2296,11 @@ struct iommu_domain *iommu_get_dma_domain(struct device *dev) return dev->iommu_group->default_domain; } +size_t iommu_group_get_max_opt_dma_size(struct iommu_group *group) +{ + return group->max_opt_dma_size; +} + /* * IOMMU groups are really the natural working unit of the IOMMU, but * the IOMMU API works on domains and devices. Bridge that gap by diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 32d448050bf7..e26abda94792 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -405,6 +405,7 @@ extern int iommu_sva_unbind_gpasid(struct iommu_domain *domain, struct device *dev, ioasid_t pasid); extern struct iommu_domain *iommu_get_domain_for_dev(struct device *dev); extern struct iommu_domain *iommu_get_dma_domain(struct device *dev); +extern size_t iommu_group_get_max_opt_dma_size(struct iommu_group *group); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot); extern int iommu_map_atomic(struct iommu_domain *domain, unsigned long iova, @@ -653,6 +654,11 @@ static inline struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) return NULL; } +static inline size_t iommu_group_get_max_opt_dma_size(struct iommu_group *group) +{ + return 0; +} + static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot) { -- 2.26.2