From patchwork Mon Aug 15 15:23:34 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 9281397 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 7E61E607FD for ; Mon, 15 Aug 2016 15:28:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6E08928D13 for ; Mon, 15 Aug 2016 15:28:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6229628D29; Mon, 15 Aug 2016 15:28:36 +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 C77DC28D13 for ; Mon, 15 Aug 2016 15:28:35 +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 1bZJmt-0008M0-Oh; Mon, 15 Aug 2016 15:26:51 +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 1bZJkZ-0005Wh-DM for linux-arm-kernel@lists.infradead.org; Mon, 15 Aug 2016 15:24:34 +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 11F89318; Mon, 15 Aug 2016 08:25:44 -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 651FA3F32C; Mon, 15 Aug 2016 08:24:09 -0700 (PDT) From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Subject: [PATCH v4 09/15] drivers: acpi: iort: add support for ARM SMMU platform devices creation Date: Mon, 15 Aug 2016 16:23:34 +0100 Message-Id: <1471274620-20754-10-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_082427_675518_2DC24548 X-CRM114-Status: GOOD ( 17.45 ) 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 In ARM ACPI systems, IOMMU components are specified through static IORT table entries. In order to create platform devices for the corresponding ARM SMMU components, IORT kernel code should be made able to parse IORT table entries and create platform devices dynamically. This patch adds the generic IORT infrastructure required to create platform devices for ARM SMMUs. ARM SMMU versions have different resources requirement therefore this patch also introduces an IORT specific structure (ie iort_iommu_config) that contains hooks (to be defined when the corresponding ARM SMMU driver support is added to the kernel) to be used to define the platform devices names, init the IOMMUs, count their resources and finally initialize them. Signed-off-by: Lorenzo Pieralisi Cc: Hanjun Guo Cc: Tomasz Nowicki Cc: "Rafael J. Wysocki" --- drivers/acpi/arm64/iort.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 153 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index f6db3d8..4043071 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -22,6 +22,7 @@ #include #include #include +#include #include struct iort_its_msi_chip { @@ -454,6 +455,157 @@ iort_get_device_domain(struct device *dev, u32 req_id) return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI); } +struct iort_iommu_config { + const char *name; + int (*iommu_init)(struct acpi_iort_node *node); + bool (*iommu_is_coherent)(struct acpi_iort_node *node); + int (*iommu_count_resources)(struct acpi_iort_node *node); + void (*iommu_init_resources)(struct resource *res, + struct acpi_iort_node *node); +}; + +static const struct iort_iommu_config * __init +iort_get_iommu_config(struct acpi_iort_node *node) +{ + return NULL; +} + +/** + * iort_add_smmu_platform_device() - Allocate a platform device for SMMU + * @fwnode: IORT node associated fwnode handle + * @node: Pointer to SMMU ACPI IORT node + * + * Returns: 0 on success, <0 failure + */ +static int __init +iort_add_smmu_platform_device(struct fwnode_handle *fwnode, + struct acpi_iort_node *node) +{ + struct platform_device *pdev; + struct resource *r; + enum dev_dma_attr attr; + int ret, count; + const struct iort_iommu_config *ops = + iort_get_iommu_config(node); + + if (!ops) + return -ENODEV; + + pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO); + if (!pdev) + return PTR_ERR(pdev); + + count = ops->iommu_count_resources(node); + + r = kcalloc(count, sizeof(*r), GFP_KERNEL); + if (!r) { + ret = -ENOMEM; + goto dev_put; + } + + ops->iommu_init_resources(r, node); + + ret = platform_device_add_resources(pdev, r, count); + /* + * Resources are duplicated in platform_device_add_resources, + * free their allocated memory + */ + kfree(r); + + if (ret) + goto dev_put; + + /* + * Add a copy of IORT node pointer to platform_data to + * be used to retrieve IORT data information. + */ + ret = platform_device_add_data(pdev, &node, sizeof(node)); + if (ret) + goto dev_put; + + pdev->dev.dma_mask = kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL); + if (!pdev->dev.dma_mask) { + ret = -ENOMEM; + goto dev_put; + } + + pdev->dev.fwnode = fwnode; + + /* + * Set default dma mask value for the table walker, + * to be overridden on probing with correct value. + */ + *pdev->dev.dma_mask = DMA_BIT_MASK(32); + pdev->dev.coherent_dma_mask = *pdev->dev.dma_mask; + + attr = ops->iommu_is_coherent(node) ? + DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT; + + /* Configure DMA for the page table walker */ + acpi_dma_configure(&pdev->dev, attr); + + ret = platform_device_add(pdev); + if (ret) + goto dma_deconfigure; + + return 0; + +dma_deconfigure: + acpi_dma_deconfigure(&pdev->dev); + kfree(pdev->dev.dma_mask); + +dev_put: + platform_device_put(pdev); + + return ret; +} + +static void __init iort_smmu_init(void) +{ + struct acpi_iort_node *iort_node, *iort_end; + struct acpi_table_iort *iort; + struct fwnode_handle *fwnode; + int i, ret; + + /* + * table and iort will both point to the start of IORT table, but + * have different struct types + */ + iort = (struct acpi_table_iort *)iort_table; + + /* Get the first IORT node */ + iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table, + iort->node_offset); + iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort_table, + iort_table->length); + + for (i = 0; i < iort->node_count; i++) { + + if (iort_node >= iort_end) { + pr_err("iort node pointer overflows, bad table\n"); + return; + } + + if (iort_node->type == ACPI_IORT_NODE_SMMU || + iort_node->type == ACPI_IORT_NODE_SMMU_V3) { + fwnode = iort_get_fwnode(iort_node); + + if (!fwnode) + continue; + + ret = iort_add_smmu_platform_device(fwnode, + iort_node); + if (ret) { + pr_err("Error in platform device creation\n"); + return; + } + } + + iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node, + iort_node->length); + } +} + void __init iort_table_detect(void) { acpi_status status; @@ -465,4 +617,5 @@ void __init iort_table_detect(void) } acpi_probe_device_table(iort); + iort_smmu_init(); }