From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933043AbcFGNc6 (ORCPT ); Tue, 7 Jun 2016 09:32:58 -0400 Received: from foss.arm.com ([217.140.101.70]:44489 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932929AbcFGNbX (ORCPT ); Tue, 7 Jun 2016 09:31:23 -0400 From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Cc: Lorenzo Pieralisi , Will Deacon , Robin Murphy , Joerg Roedel , Marc Zyngier , "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 v2 10/15] drivers: iommu: arm-smmu-v3: enable ACPI driver initialization Date: Tue, 7 Jun 2016 14:31:05 +0100 Message-Id: <1465306270-27076-11-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1465306270-27076-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1465306270-27076-1-git-send-email-lorenzo.pieralisi@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On systems booting with ACPI that enable the ARM SMMU components in the kernel config options, the ARM SMMU v3 init function (ie arm_smmu_init(), that registers the driver and sets-up bus iommu operations) does not run only because the device tree interface (of_find_matching_node()) fails to find the respective device tree nodes for ARM SMMU devices. This works as long as there are no ARM SMMU devices to be probed with ACPI. If ARM SMMU v3 components are part of the IORT tables, for them to be instantiated and probed the function registering the ARM SMMU v3 driver must be able to register the driver and initialize the bus IOMMU operations accordingly. This patch changes the logic in arm-smmu-v3 init call to allow for it to be probed in ACPI systems. Signed-off-by: Lorenzo Pieralisi Cc: Will Deacon Cc: Robin Murphy Cc: Joerg Roedel --- drivers/iommu/arm-smmu-v3.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 75f93aa..90745a8 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -2643,11 +2643,16 @@ static int __init arm_smmu_init(void) struct device_node *np; int ret; - np = of_find_matching_node(NULL, arm_smmu_of_match); - if (!np) - return 0; + if (acpi_disabled) { + np = of_find_matching_node(NULL, arm_smmu_of_match); + if (!np) + return 0; - of_node_put(np); + of_node_put(np); + } else { + if (!iort_node_match(ACPI_IORT_NODE_SMMU_V3)) + return 0; + } ret = platform_driver_register(&arm_smmu_driver); if (ret) -- 2.6.4