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: 328402 Delivered-To: patch@linaro.org Received: by 2002:a05:6e02:5ce:0:0:0:0 with SMTP id l14csp361488ils; Thu, 19 Nov 2020 04:13:52 -0800 (PST) X-Google-Smtp-Source: ABdhPJz0NdHER39om5EGbF2isVqB9LqBMlL9/PlbnBrwzolRNbL2+zYkldYiMZjBHn8l842hn1MC X-Received: by 2002:a05:6402:1019:: with SMTP id c25mr2636705edu.297.1605788032180; Thu, 19 Nov 2020 04:13:52 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1605788032; cv=none; d=google.com; s=arc-20160816; b=OTyr7i1gyQBk3P1JZ5CbXNITxitn75l/LD7GvKL+88ZMIdTZPXxaMLnjsQYZToI2zM n1pVB6M15YoT+77GJE5nG4XGMj4q/CQpj5nuK+M8nPwsE7xiFKLuwPJKaCKlh+jOa8as 6oCvfpRlbSleYje/BPW70LkAsqylGZitxKzg5I/DNco0QphdEZgUhdjb2GLR2WWLLzQJ 66xaCkvHvhGcG75vxIw6x2Gs0Pd53v/dj6iZC1ONygiIYfj+WCLFo7ctwz3aCj4zD+1l igLSqf3yEyYhD1PCwA+WYvY3tNyvIzovj8LRfjlvu7uKdlYeavmxxVXmDGreBjWM2y4c 3SRw== 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=eewYhq/zZjuaZlIaDY2gouIWEBzbezEuaMJqHKLi4QA=; b=bryj8r0Xyr6VEp3yrDJPrdzgIJaMv8Ef512vDKYzByGbXBn2DSNt31eZ9LelaiFuZp 10MEc0tOByEG7tm5iwoLUz+DFoH7s+wmmZKd/vpQdpvW0otEzBiI8lWuTxr7tE8/ply1 fXoTY+nCEmzyCKvLlYxVIL4ElZeXYymxjvnXSS/gqgZRB+YqZsmhSyx1PT0uYAfapIKD 5ESMmBlmY7C7vhP5aPmQCb8lLp4pbmRoaCo5ewGOTBWerPO4IZSQrIyri2j80tS8qwFX HPuP1x6FEfARIyk3/MtwCWLiMh5e9v97wRpq4j98qfdFRImZuZKWutcsfEocPG77upAB opcw== 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 Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id qc4si16705640ejb.188.2020.11.19.04.13.52; Thu, 19 Nov 2020 04:13:52 -0800 (PST) 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727253AbgKSMMt (ORCPT + 5 others); Thu, 19 Nov 2020 07:12:49 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:8120 "EHLO szxga05-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727058AbgKSMMs (ORCPT ); Thu, 19 Nov 2020 07:12:48 -0500 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: , , , CC: , , , , , , , , 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 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.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(+) -- 2.17.1 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);