From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756052AbcDNRYd (ORCPT ); Thu, 14 Apr 2016 13:24:33 -0400 Received: from foss.arm.com ([217.140.101.70]:44853 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755786AbcDNRXa (ORCPT ); Thu, 14 Apr 2016 13:23:30 -0400 From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Cc: Lorenzo Pieralisi , Will Deacon , Robin Murphy , Marc Zyngier , Joerg Roedel , "Rafael J. Wysocki" , Tomasz Nowicki , Hanjun Guo , Jon Masters , Sinan Kaya , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 07/11] drivers: iommu: arm-smmu: allow ACPI based streamid translation Date: Thu, 14 Apr 2016 18:25:39 +0100 Message-Id: <1460654743-7896-8-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1460654743-7896-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1460654743-7896-1-git-send-email-lorenzo.pieralisi@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The ACPI IORT table provides data to ARM IOMMU drivers to carry out streamid mappings and the kernel has the infrastructure to implement it through the fw_xlate() struct iommu_ops hook. By relying on the DT agnostic struct iommu_fwspec fields, this patch adds code in the ARM SMMU fw_xlate() callback that allows streamid translation on ACPI based ARM system. Signed-off-by: Lorenzo Pieralisi Cc: Will Deacon Cc: Robin Murphy --- drivers/iommu/arm-smmu.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 84bcff7..0f1e784 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1440,6 +1440,20 @@ out_unlock: return ret; } +static int arm_smmu_dev_node_match(struct device *dev, void *data) +{ + return is_fwnode_iommu(dev->fwnode) && dev->fwnode == data; +} + +static struct platform_device *arm_smmu_get_dev(struct fwnode_handle *fwnode) +{ + struct device *dev; + + dev = bus_find_device(&platform_bus_type, NULL, fwnode, + arm_smmu_dev_node_match); + return dev ? to_platform_device(dev) : NULL; +} + static int arm_smmu_fw_xlate(struct device *dev, struct iommu_fwspec *args) { struct arm_smmu_device *smmu; @@ -1447,6 +1461,8 @@ static int arm_smmu_fw_xlate(struct device *dev, struct iommu_fwspec *args) if (is_of_node(args->fwnode)) smmu_pdev = of_find_device_by_node(to_of_node(args->fwnode)); + else if (is_fwnode_iommu(args->fwnode)) + smmu_pdev = arm_smmu_get_dev(args->fwnode); if (!smmu_pdev) return -ENODEV; -- 2.6.4