Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S939269AbdDTEU1 (ORCPT ); Thu, 20 Apr 2017 00:20:27 -0400 Received: from mail-wm0-f67.google.com ([74.125.82.67]:35367 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S939214AbdDTEUZ (ORCPT ); Thu, 20 Apr 2017 00:20:25 -0400 MIME-Version: 1.0 In-Reply-To: <1492430246-17267-1-git-send-email-sunil.kovvuri@gmail.com> References: <1492430246-17267-1-git-send-email-sunil.kovvuri@gmail.com> From: Sunil Kovvuri Date: Thu, 20 Apr 2017 09:50:23 +0530 Message-ID: Subject: Re: [PATCH] iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed To: Will Deacon , iommu@lists.linux-foundation.org Cc: LAKML , LKML , robert.richter@cavium.com, Sunil Goutham Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1147 Lines: 37 On Mon, Apr 17, 2017 at 5:27 PM, wrote: > 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 > Any comments or is this patch accepted ? Thanks, Sunil.