From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lu Baolu Subject: [PATCH v3 2/8] iommu/vt-d: Add multiple domains per device query Date: Fri, 12 Oct 2018 13:16:26 +0800 Message-ID: <20181012051632.26064-3-baolu.lu@linux.intel.com> References: <20181012051632.26064-1-baolu.lu@linux.intel.com> Cc: ashok.raj@intel.com, sanjay.k.kumar@intel.com, jacob.jun.pan@intel.com, kevin.tian@intel.com, Jean-Philippe Brucker , yi.l.liu@intel.com, yi.y.sun@intel.com, peterx@redhat.com, tiwei.bie@intel.com, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Lu Baolu , Jacob Pan To: Joerg Roedel , David Woodhouse , Alex Williamson , Kirti Wankhede Return-path: In-Reply-To: <20181012051632.26064-1-baolu.lu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org Add the response to IOMMU_DEV_ATTR_AUXD_CAPABILITY capability query through iommu_get_dev_attr(). Cc: Ashok Raj Cc: Jacob Pan Cc: Kevin Tian Cc: Liu Yi L Signed-off-by: Lu Baolu --- drivers/iommu/intel-iommu.c | 38 +++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 4b1f7426acea..3133216e5733 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5170,6 +5170,24 @@ static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain, return phys; } +static inline bool scalable_mode_support(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + bool ret = true; + + rcu_read_lock(); + for_each_active_iommu(iommu, drhd) { + if (!sm_supported(iommu)) { + ret = false; + break; + } + } + rcu_read_unlock(); + + return ret; +} + static bool intel_iommu_capable(enum iommu_cap cap) { if (cap == IOMMU_CAP_CACHE_COHERENCY) @@ -5334,6 +5352,25 @@ struct intel_iommu *intel_svm_device_to_iommu(struct device *dev) } #endif /* CONFIG_INTEL_IOMMU_SVM */ +static int intel_iommu_get_dev_attr(struct device *dev, + enum iommu_dev_attr attr, void *data) +{ + int ret = 0; + bool *auxd_capable; + + switch (attr) { + case IOMMU_DEV_ATTR_AUXD_CAPABILITY: + auxd_capable = data; + *auxd_capable = scalable_mode_support(); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + const struct iommu_ops intel_iommu_ops = { .capable = intel_iommu_capable, .domain_alloc = intel_iommu_domain_alloc, @@ -5348,6 +5385,7 @@ const struct iommu_ops intel_iommu_ops = { .get_resv_regions = intel_iommu_get_resv_regions, .put_resv_regions = intel_iommu_put_resv_regions, .device_group = pci_device_group, + .get_dev_attr = intel_iommu_get_dev_attr, .pgsize_bitmap = INTEL_IOMMU_PGSIZES, }; -- 2.17.1