From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rick Song Subject: [RFC,v1,1/2] iommu/arm-smmu: support s2 domain attribute Date: Fri, 21 Oct 2016 12:39:23 +0800 Message-ID: <1477024764-79882-1-git-send-email-songwenjun@huawei.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Sender: kvm-owner@vger.kernel.org To: will.deacon@arm.com, robin.murphy@arm.com, joro@8bytes.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, alex.williamson@redhat.com, kvm@vger.kernel.org, songwenjun@huawei.com List-Id: iommu@lists.linux-foundation.org Under some condition, user want to use the only stage 2 translation ability, so smmu driver need support setting only s2 domain attribute. Signed-off-by: Rick Song --- drivers/iommu/arm-smmu-v3.c | 12 ++++++++++++ include/linux/iommu.h | 1 + 2 files changed, 13 insertions(+) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 15c01c3..d3b19d2 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1854,6 +1854,18 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain, mutex_lock(&smmu_domain->init_mutex); switch (attr) { + case DOMAIN_ATTR_S2: + if (smmu_domain->smmu) { + ret = -EPERM; + goto out_unlock; + } + + if (*(int *)data) + smmu_domain->stage = ARM_SMMU_DOMAIN_S2; + else + smmu_domain->stage = ARM_SMMU_DOMAIN_S1; + + break; case DOMAIN_ATTR_NESTING: if (smmu_domain->smmu) { ret = -EPERM; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 436dc21..0b5a387 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -114,6 +114,7 @@ enum iommu_attr { DOMAIN_ATTR_FSL_PAMU_ENABLE, DOMAIN_ATTR_FSL_PAMUV1, DOMAIN_ATTR_NESTING, /* two stages of translation */ + DOMAIN_ATTR_S2, /* only stage 2 translation */ DOMAIN_ATTR_MAX, }; -- 1.9.1