From patchwork Tue Apr 20 08:27:45 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: 12213633 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=ham 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 40916C433B4 for ; Tue, 20 Apr 2021 09:28:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0AFA761073 for ; Tue, 20 Apr 2021 09:28:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231183AbhDTJ3J (ORCPT ); Tue, 20 Apr 2021 05:29:09 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:17801 "EHLO szxga07-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229761AbhDTJ3I (ORCPT ); Tue, 20 Apr 2021 05:29:08 -0400 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4FPdbV3Xh4z7vrv; Tue, 20 Apr 2021 17:26:14 +0800 (CST) Received: from A2006125610.china.huawei.com (10.47.83.26) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.498.0; Tue, 20 Apr 2021 17:28:26 +0800 From: Shameer Kolothum To: , , CC: , , , , , , , , , Subject: [PATCH v3 04/10] iommu/dma: Add a helper function to reserve RMRs for IOMMU drivers Date: Tue, 20 Apr 2021 10:27:45 +0200 Message-ID: <20210420082751.1829-5-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20210420082751.1829-1-shameerali.kolothum.thodi@huawei.com> References: <20210420082751.1829-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.47.83.26] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org IOMMU drivers can use this to implement their .get_resv_regions callback for any RMR address regions specific to a device. As per ACPI IORT E.b spec, a check is added to make sure OS has preserved the PCIe configuration done by boot firmware. Signed-off-by: Shameer Kolothum Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/iommu/dma-iommu.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/dma-iommu.h | 7 +++++++ 2 files changed, 42 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index a942cc04eee1..c624000bf230 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -191,6 +191,41 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list) } EXPORT_SYMBOL(iommu_dma_get_resv_regions); +void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr, + struct list_head *list) +{ + int prot = IOMMU_READ | IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO; + struct iommu_resv_region *region; + enum iommu_resv_type type; + + /* + * For ACPI, please make sure the OS has preserved the PCIe configuration + * performed by the boot firmware(See IORT revision E.b). + */ + if (!is_of_node(dev_iommu_fwspec_get(dev)->iommu_fwnode) && + dev_is_pci(dev)) { + struct pci_dev *pdev = to_pci_dev(dev); + struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus); + + if (!host->preserve_config) + return; + } + + if (rmr->flags & IOMMU_RMR_REMAP_PERMITTED) + type = IOMMU_RESV_DIRECT_RELAXABLE; + else + type = IOMMU_RESV_DIRECT; + + region = iommu_alloc_resv_region(rmr->base_address, + rmr->length, prot, + type); + if (!region) + return; + + list_add_tail(®ion->list, list); +} +EXPORT_SYMBOL(iommu_dma_get_rmr_resv_regions); + /** * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated * with a given IOMMU diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index beb84c4fe5b1..dbad5073c9e0 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -40,6 +40,8 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list); void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, struct iommu_domain *domain); +void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr, + struct list_head *list); int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list); struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, u32 sid, u32 flags); @@ -89,6 +91,11 @@ static inline void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, { } +static void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr, + struct list_head *list) +{ +} + int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list); { return 0;