From patchwork Thu Aug 5 08:07:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameerali Kolothum Thodi X-Patchwork-Id: 492243 Delivered-To: patch@linaro.org Received: by 2002:a05:6638:396:0:0:0:0 with SMTP id y22csp55259jap; Thu, 5 Aug 2021 01:09:06 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwZwGJ1e8JNFBFqbKZXeE3jZmFjDPhiXE07oB7PbC/2SYbVuKaXhCzSDnWDJmELVEx7tXrY X-Received: by 2002:a17:906:4943:: with SMTP id f3mr3606612ejt.102.1628150945976; Thu, 05 Aug 2021 01:09:05 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1628150945; cv=none; d=google.com; s=arc-20160816; b=DCcpfSj9lmTFR6V/VKxRH8ziPIae1otBg7o5P+24tEUZ8x6agc69A63oJpnnkzYT+d pULKwzCvdIzbtqbLVafRifHyvWkNt/JVw0iU1Y3KcYyH1bAI95iWOBUITLGL0Y0bppCr 5FEeKi/aLMml3O2x295j2ZD3KwgoP3KH7CoWlkqel5EC7KB97oZy5xSpByJSEosTnI/m 6/DkjIe6geIcyFt17HhnZIDv0W5w73wWgy6ixeIKJEvBgbe8t2rN9fN07iWaHYf1Pd0i 8fmc1CaN63HPngKSgDllXHkHa0+80dQ7cXcyRJn5SQzGm6m2eAsMRXn428Pr76q6hrod fdPg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:in-reply-to:message-id :date:subject:cc:to:from; bh=goYH1kxTUVniKteiIS7yqNleQTw7O8pk3eq1u9rBwJ4=; b=bjpQNZSqoh5YEE/rdYSY8FF2xUBOhS1Hvs/8cL1Fb8BAGqpuHqsqU6bNigROwgZYmx WLjTs2Hf8X+phwUOLTaKZSUrragaSx1rLhYK5axn8gA5u23Ju4i5TAjvFd7oFxcXwZwV HdVFWaWH/nEJH3AfLlecyRSUOCqt3SZv6CgBZthYz4Lkyqi2zIvnxeS+v8tuUy/EInzi 1WYMvFlimu0Mzyg71DyM4dIROfmhHn9Dml9nsNoFgAW1fTAP6Hg8e2CCGOr8OGQbA1mE CP/lCamBQTTjmugfw/3cE7RM0VbBOagUbkIv1CASYj5RxX8BFIPiJox9tRzf+X9qhN6r iECA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-acpi-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-acpi-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=huawei.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id g18si5224762ejp.458.2021.08.05.01.09.05; Thu, 05 Aug 2021 01:09:05 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-acpi-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-acpi-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-acpi-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=huawei.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232700AbhHEIJS (ORCPT + 4 others); Thu, 5 Aug 2021 04:09:18 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]:3587 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232559AbhHEIJR (ORCPT ); Thu, 5 Aug 2021 04:09:17 -0400 Received: from fraeml739-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4GgLpk5g0Qz6GBjV; Thu, 5 Aug 2021 16:08:46 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml739-chm.china.huawei.com (10.206.15.220) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Thu, 5 Aug 2021 10:09:02 +0200 Received: from A2006125610.china.huawei.com (10.47.91.4) 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 15.1.2176.2; Thu, 5 Aug 2021 09:08:55 +0100 From: Shameer Kolothum To: , , CC: , , , , , , , , , , , Subject: [PATCH v7 3/9] iommu/dma: Introduce generic helper to retrieve RMR info Date: Thu, 5 Aug 2021 09:07:18 +0100 Message-ID: <20210805080724.480-4-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20210805080724.480-1-shameerali.kolothum.thodi@huawei.com> References: <20210805080724.480-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.47.91.4] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) 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 | 29 +++++++++++++++++++++++++++++ include/linux/dma-iommu.h | 13 +++++++++++++ 2 files changed, 42 insertions(+) -- 2.17.1 diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 98ba927aee1a..2fa2445e9070 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -174,6 +174,35 @@ void iommu_put_dma_cookie(struct iommu_domain *domain) } EXPORT_SYMBOL(iommu_put_dma_cookie); +/** + * + * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated + * with a given IOMMU + * @iommu_fwnode: fwnode associated with IOMMU + * @list: RMR list to be populated + * + */ +int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode, + struct list_head *list) +{ + return -EINVAL; +} +EXPORT_SYMBOL(iommu_dma_get_rmrs); + +/** + * + * iommu_dma_put_rmrs - Release Reserved Memory Regions(RMRs) associated + * with a given IOMMU + * @iommu_fwnode: fwnode associated with IOMMU + * @list: RMR list + * + */ +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 758ca4694257..3b7b2d096c6e 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -42,12 +42,16 @@ void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, extern bool iommu_dma_forcedac; +int iommu_dma_get_rmrs(struct fwnode_handle *iommu, 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) @@ -83,5 +87,14 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he { } +static int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list) +{ + return -ENODEV; +} + +static void iommu_dma_put_rmrs(struct fwnode_handle *iommu, struct list_head *list) +{ +} + #endif /* CONFIG_IOMMU_DMA */ #endif /* __DMA_IOMMU_H */