From patchwork Thu Nov 19 12:11:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameerali Kolothum Thodi X-Patchwork-Id: 11917229 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,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 9026BC6369E for ; Thu, 19 Nov 2020 12:13:30 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1D630206CA for ; Thu, 19 Nov 2020 12:13:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="oMAPJwVc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1D630206CA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-ID:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=MHkdLbdj41TMIqCM6SOEQl0MDFenhXs+ly1t/Fj4+tI=; b=oMAPJwVcuB/PxXka7JfUHeKeX 8096qWajuxnBRmf+wgwGTwuzwcLwhLcM8tRTlxTyYd6In/1CcGFG4ErND4HelhNDIX4VVWO2+9nU5 fn0iQSegPUdpQ31V3nWnIWspyqXsVYbnw6Gv2K9whczXP101IuGyrJDzdpid8ZZAw6XEkHG3mmBzh A7ho9G82dedidk5hLOYfVEIwfUjzqLN7ottFq59eth59H3jdNCIYj83857FUdyZiNYuuQCZWP4vA5 AUH8KpmK9yXvmt7AvfpSIsi2WEcIRThHSeV1/pfbhRMKMJxd0gjzBhflQs9j6t8+XzZgUwwo26Ev/ Rp9QW2rwg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kfio9-0003aW-Rc; Thu, 19 Nov 2020 12:13:01 +0000 Received: from szxga05-in.huawei.com ([45.249.212.191]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kfio0-0003XV-G3 for linux-arm-kernel@lists.infradead.org; Thu, 19 Nov 2020 12:12:54 +0000 Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4CcJTP2bGyzLr01; Thu, 19 Nov 2020 20:12:25 +0800 (CST) Received: from S00345302A-PC.china.huawei.com (10.210.168.73) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.487.0; Thu, 19 Nov 2020 20:12:38 +0800 From: Shameer Kolothum To: , , , Subject: [RFC PATCH v2 3/8] iommu/dma: Introduce generic helper to retrieve RMR info Date: Thu, 19 Nov 2020 12:11:45 +0000 Message-ID: <20201119121150.3316-4-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20201119121150.3316-1-shameerali.kolothum.thodi@huawei.com> References: <20201119121150.3316-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.210.168.73] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201119_071253_057115_6BAFF4C9 X-CRM114-Status: GOOD ( 15.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lorenzo.pieralisi@arm.com, joro@8bytes.org, jonathan.cameron@huawei.com, linuxarm@huawei.com, steven.price@arm.com, guohanjun@huawei.com, Sami.Mujawar@arm.com, robin.murphy@arm.com, wanghuiqiang@huawei.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Reserved Memory Regions(RMR) associated with an IOMMU may be described either through ACPI tables or DT in systems with devices that require a unity mapping or bypass for those regions in IOMMU drivers. 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 | 36 ++++++++++++++++++++++++++++++++++++ include/linux/dma-iommu.h | 7 +++++++ include/linux/iommu.h | 16 ++++++++++++++++ 3 files changed, 59 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 0cbcd3fc3e7e..d73768ecdd1a 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -166,6 +166,42 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list) } EXPORT_SYMBOL(iommu_dma_get_resv_regions); +/** + * 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 0; +} +EXPORT_SYMBOL(iommu_dma_get_rmrs); + +struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, + u32 *ids, int num_ids) +{ + struct iommu_rmr *rmr; + int i; + + rmr = kzalloc(struct_size(rmr, ids, num_ids), GFP_KERNEL); + if (!rmr) + return NULL; + + INIT_LIST_HEAD(&rmr->list); + rmr->base_address = base; + rmr->length = length; + rmr->num_ids = num_ids; + + for (i = 0; i < num_ids; i++) + rmr->ids[i] = ids[i]; + + return rmr; +} +EXPORT_SYMBOL(iommu_dma_alloc_rmr); + static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie, phys_addr_t start, phys_addr_t end) { diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index 2112f21f73d8..8900ccbc9e6a 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -37,6 +37,9 @@ void iommu_dma_compose_msi_msg(struct msi_desc *desc, void iommu_dma_get_resv_regions(struct device *dev, 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 *ids, int num_ids); #else /* CONFIG_IOMMU_DMA */ struct iommu_domain; @@ -78,5 +81,9 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he { } +int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list); +{ + return 0; +} #endif /* CONFIG_IOMMU_DMA */ #endif /* __DMA_IOMMU_H */ diff --git a/include/linux/iommu.h b/include/linux/iommu.h index b95a6f8db6ff..e43c4e8084e7 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -592,6 +592,22 @@ struct iommu_sva { struct device *dev; }; +/** + * struct iommu_rmr - Reserved Memory Region details per IOMMU + * @list: Linked list pointers to hold RMR region info + * @base_address: base address of Reserved Memory Region + * @length: length of memory region + * @num_ids: number of associated device IDs + * @ids: associated device IDs + */ +struct iommu_rmr { + struct list_head list; + phys_addr_t base_address; + u64 length; + unsigned int num_ids; + u32 ids[]; +}; + int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, const struct iommu_ops *ops); void iommu_fwspec_free(struct device *dev);