From patchwork Mon Feb 21 15:43:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameerali Kolothum Thodi X-Patchwork-Id: 12753820 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05A61C433FE for ; Mon, 21 Feb 2022 15:46:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379481AbiBUPqZ (ORCPT ); Mon, 21 Feb 2022 10:46:25 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:38030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379562AbiBUPpe (ORCPT ); Mon, 21 Feb 2022 10:45:34 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F20B22B00 for ; Mon, 21 Feb 2022 07:45:11 -0800 (PST) Received: from fraeml711-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4K2RMb1rg1z6GCsV; Mon, 21 Feb 2022 23:40:27 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml711-chm.china.huawei.com (10.206.15.60) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 21 Feb 2022 16:45:09 +0100 Received: from A2006125610.china.huawei.com (10.47.91.169) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 21 Feb 2022 15:45:01 +0000 From: Shameer Kolothum To: , , CC: , , , , , , , , , , , Subject: [PATCH v8 04/11] iommu/dma: Introduce generic helper to retrieve RMR info Date: Mon, 21 Feb 2022 15:43:37 +0000 Message-ID: <20220221154344.2126-5-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20220221154344.2126-1-shameerali.kolothum.thodi@huawei.com> References: <20220221154344.2126-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.47.91.169] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Reserved Memory Regions(RMR) associated with an IOMMU can be described through ACPI IORT tables in systems with devices that require a unity mapping or bypass for those regions. Introduce a generic interface so that IOMMU drivers can retrieve and set up necessary mappings. Signed-off-by: Shameer Kolothum --- drivers/iommu/dma-iommu.c | 21 +++++++++++++++++++++ include/linux/dma-iommu.h | 14 ++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index d85d54f2b549..65ab01d5128b 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -370,6 +370,27 @@ void iommu_put_dma_cookie(struct iommu_domain *domain) domain->iova_cookie = NULL; } +/** + * + * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated + * with a given IOMMU and device(optional) + * @iommu_fwnode: fwnode associated with IOMMU + * @dev: Optional associated device + * @list: Reserved region list to be populated + * + */ +void iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode, struct device *dev, + struct list_head *list) +{ +} +EXPORT_SYMBOL(iommu_dma_get_rmrs); + +void iommu_dma_put_rmrs(struct fwnode_handle *iommu_fwnode, + struct list_head *list) +{ +} +EXPORT_SYMBOL(iommu_dma_put_rmrs); + /** * iommu_dma_get_resv_regions - Reserved region driver helper * @dev: Device from iommu_get_resv_regions() diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index 24607dc3c2ac..897b457cad2c 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -43,12 +43,17 @@ void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, extern bool iommu_dma_forcedac; +void iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct device *dev, + struct list_head *list); + +void iommu_dma_put_rmrs(struct fwnode_handle *iommu, struct list_head *list); #else /* CONFIG_IOMMU_DMA */ struct iommu_domain; struct msi_desc; struct msi_msg; struct device; +struct fwnode_handle; static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit) @@ -89,5 +94,14 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he { } +static inline void iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct device *dev, + struct list_head *list) +{ +} + +static inline void iommu_dma_put_rmrs(struct fwnode_handle *iommu, struct list_head *list) +{ +} + #endif /* CONFIG_IOMMU_DMA */ #endif /* __DMA_IOMMU_H */