From patchwork Mon Aug 15 15:23:40 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 9281401 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 57345607FD for ; Mon, 15 Aug 2016 15:29:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 486C928D26 for ; Mon, 15 Aug 2016 15:29:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3D4EF28D29; Mon, 15 Aug 2016 15:29:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id AB85528D33 for ; Mon, 15 Aug 2016 15:29:40 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bZJo7-0000vH-K1; Mon, 15 Aug 2016 15:28:07 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bZJkb-0005WL-M2 for linux-arm-kernel@lists.infradead.org; Mon, 15 Aug 2016 15:24:35 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BF3D6BFD; Mon, 15 Aug 2016 08:26:00 -0700 (PDT) Received: from red-moon.cambridge.arm.com (red-moon.cambridge.arm.com [10.1.206.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1C8A13F32C; Mon, 15 Aug 2016 08:24:25 -0700 (PDT) From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Subject: [PATCH v4 15/15] drivers: acpi: iort: introduce iort_iommu_configure Date: Mon, 15 Aug 2016 16:23:40 +0100 Message-Id: <1471274620-20754-16-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1471274620-20754-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1471274620-20754-1-git-send-email-lorenzo.pieralisi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160815_082429_893710_EE5775EC X-CRM114-Status: GOOD ( 16.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, Lorenzo Pieralisi , Marc Zyngier , Tomasz Nowicki , Joerg Roedel , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Will Deacon , Sinan Kaya , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, Hanjun Guo , Jon Masters , Dennis Chen , Robin Murphy , Nate Watterson MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP DT based systems have a generic kernel API to configure IOMMUs for devices (ie of_iommu_configure()). On ARM based ACPI systems, the of_iommu_configure() equivalent can be implemented atop ACPI IORT kernel API, with the corresponding functions to map device identifiers to IOMMUs and retrieve the corresponding IOMMU operations necessary for DMA operations set-up. By relying on the iommu_fwspec generic kernel infrastructure, implement the IORT based IOMMU configuration for ARM ACPI systems and hook it up in the ACPI kernel layer that implements DMA configuration for a device. Signed-off-by: Lorenzo Pieralisi Cc: Hanjun Guo Cc: Tomasz Nowicki Cc: "Rafael J. Wysocki" --- drivers/acpi/arm64/iort.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/acpi/scan.c | 7 +++- include/linux/iort.h | 5 +++ 3 files changed, 107 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index e68ed2c..c231629 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -18,6 +18,7 @@ #define pr_fmt(fmt) "ACPI: IORT: " fmt +#include #include #include #include @@ -27,6 +28,8 @@ #define IORT_TYPE_MASK(type) (1 << (type)) #define IORT_MSI_TYPE (1 << ACPI_IORT_NODE_ITS_GROUP) +#define IORT_IOMMU_TYPE ((1 << ACPI_IORT_NODE_SMMU) | \ + (1 << ACPI_IORT_NODE_SMMU_V3)) struct iort_its_msi_chip { struct list_head list; @@ -496,6 +499,99 @@ iort_get_device_domain(struct device *dev, u32 req_id) return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI); } +static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data) +{ + u32 *rid = data; + + *rid = alias; + return 0; +} + +static int arm_smmu_iort_xlate(struct device *dev, u32 streamid, + struct fwnode_handle *fwnode) +{ + int ret = iommu_fwspec_init(dev, fwnode); + + if (!ret) + ret = iommu_fwspec_add_ids(dev, &streamid, 1); + + return ret; +} + +static const struct iommu_ops * +iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node, + u32 streamid) +{ + struct fwnode_handle *iort_fwnode = NULL; + int ret; + + if (node) { + iort_fwnode = iort_get_fwnode(node); + if (!iort_fwnode) + return NULL; + + ret = arm_smmu_iort_xlate(dev, streamid, + iort_fwnode); + if (!ret) + return fwspec_iommu_get_ops(iort_fwnode); + } + + return NULL; +} + +/** + * iort_iommu_configure - Set-up IOMMU configuration for a device. + * + * @dev: device to configure + * + * Returns: iommu_ops pointer on configuration success + * NULL on configuration failure + */ +const struct iommu_ops *iort_iommu_configure(struct device *dev) +{ + struct acpi_iort_node *node, *parent; + const struct iommu_ops *ops = NULL; + u32 streamid = 0; + + if (dev_is_pci(dev)) { + struct pci_bus *bus = to_pci_dev(dev)->bus; + u32 rid; + + pci_for_each_dma_alias(to_pci_dev(dev), __get_pci_rid, + &rid); + + node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, + iort_match_node_callback, &bus->dev); + if (!node) + return NULL; + + parent = iort_node_map_rid(node, rid, &streamid, + IORT_IOMMU_TYPE); + + ops = iort_iommu_xlate(dev, parent, streamid); + + } else { + int i = 0; + + node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT, + iort_match_node_callback, dev); + if (!node) + return NULL; + + parent = iort_node_get_id(node, &streamid, + IORT_IOMMU_TYPE, i++); + + while (parent) { + ops = iort_iommu_xlate(dev, parent, streamid); + + parent = iort_node_get_id(node, &streamid, + IORT_IOMMU_TYPE, i++); + } + } + + return ops; +} + static void __init acpi_iort_register_irq(int hwirq, const char *name, int trigger, struct resource *res) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 0bdc98e..e875537 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include #include @@ -1377,11 +1378,15 @@ enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) */ void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr) { + const struct iommu_ops *iommu; + + iommu = iort_iommu_configure(dev); + /* * Assume dma valid range starts at 0 and covers the whole * coherent_dma_mask. */ - arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, NULL, + arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, iommu, attr == DEV_DMA_COHERENT); } diff --git a/include/linux/iort.h b/include/linux/iort.h index bf37aaf..1b6c50d 100644 --- a/include/linux/iort.h +++ b/include/linux/iort.h @@ -34,6 +34,8 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); int iort_set_fwnode(struct acpi_iort_node *iort_node, struct fwnode_handle *fwnode); struct fwnode_handle *iort_get_fwnode(struct acpi_iort_node *node); +/* IOMMU interface */ +const struct iommu_ops *iort_iommu_configure(struct device *dev); #else static inline bool iort_node_match(u8 type) { return false; } static inline void iort_table_detect(void) { } @@ -46,6 +48,9 @@ static inline int iort_set_fwnode(struct acpi_iort_node *iort_node, { return -ENODEV; } static inline struct fwnode_handle * iort_get_fwnode(struct acpi_iort_node *node) { return NULL; } +/* IOMMU interface */ +static inline const struct iommu_ops * +iort_iommu_configure(struct device *dev) { return NULL; } #endif #define IORT_ACPI_DECLARE(name, table_id, fn) \