Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753635AbdDQL5y (ORCPT ); Mon, 17 Apr 2017 07:57:54 -0400 Received: from mail-pg0-f66.google.com ([74.125.83.66]:34541 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750896AbdDQL5w (ORCPT ); Mon, 17 Apr 2017 07:57:52 -0400 From: sunil.kovvuri@gmail.com To: will.deacon@arm.com, iommu@lists.linux-foundation.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, robert.richter@cavium.com, Sunil Goutham Subject: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed Date: Mon, 17 Apr 2017 17:27:26 +0530 Message-Id: <1492430246-17267-1-git-send-email-sunil.kovvuri@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 920 Lines: 30 From: Sunil Goutham For software initiated address translation, when domain type is IOMMU_DOMAIN_IDENTITY i.e SMMU is bypassed, mimic HW behavior i.e return the same IOVA as translated address. This patch is an extension to Will Deacon's patchset "Implement SMMU passthrough using the default domain". Signed-off-by: Sunil Goutham --- drivers/iommu/arm-smmu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 41afb07..2f4a130 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1405,6 +1405,9 @@ static phys_addr_t arm_smmu_iova_to_phys(struct iommu_domain *domain, struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); struct io_pgtable_ops *ops= smmu_domain->pgtbl_ops; + if (domain->type == IOMMU_DOMAIN_IDENTITY) + return iova; + if (!ops) return 0; -- 2.7.4