[PATCH v3 3/8] iommu/vt-d: Enable/disable multiple domains per device

Lu Baolu
2018-10-12T05:16:27Z

Add iommu ops for enabling and disabling multiple domains per
device.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 57 +++++++++++++++++++++++++++++++++++++
include/linux/intel-iommu.h | 1 +
2 files changed, 58 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 3133216e5733..27beda7f9d88 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2476,6 +2476,7 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
info->domain = domain;
info->iommu = iommu;
info->pasid_table = NULL;
+ info->auxd_enabled = 0;

if (dev && dev_is_pci(dev)) {
struct pci_dev *pdev = to_pci_dev(info->dev);
@@ -5371,6 +5372,61 @@ static int intel_iommu_get_dev_attr(struct device *dev,
return ret;
}

+static int intel_iommu_enable_auxd(struct device *dev)
+{
+ struct device_domain_info *info;
+ struct dmar_domain *domain;
+ unsigned long flags;
+
+ if (!scalable_mode_support())
+ return -ENODEV;
+
+ domain = get_valid_domain_for_dev(dev);
+ if (!domain)
+ return -ENODEV;
+
+ spin_lock_irqsave(&device_domain_lock, flags);
+ info = dev->archdata.iommu;
+ info->auxd_enabled = 1;
+ spin_unlock_irqrestore(&device_domain_lock, flags);
+
+ return 0;
+}
+
+static int intel_iommu_disable_auxd(struct device *dev)
+{
+ struct device_domain_info *info;
+ unsigned long flags;
+
+ spin_lock_irqsave(&device_domain_lock, flags);
+ info = dev->archdata.iommu;
+ if (!WARN_ON(!info))
+ info->auxd_enabled = 0;
+ spin_unlock_irqrestore(&device_domain_lock, flags);
+
+ return 0;
+}
+
+static int intel_iommu_set_dev_attr(struct device *dev,
+ enum iommu_dev_attr attr, void *data)
+{
+ int ret = 0;
+
+ switch (attr) {
+ case IOMMU_DEV_ATTR_AUXD_ENABLE:
+ ret = intel_iommu_enable_auxd(dev);
+ break;
+ case IOMMU_DEV_ATTR_AUXD_DISABLE:
+ ret = intel_iommu_disable_auxd(dev);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.domain_alloc = intel_iommu_domain_alloc,
@@ -5386,6 +5442,7 @@ const struct iommu_ops intel_iommu_ops = {
.put_resv_regions = intel_iommu_put_resv_regions,
.device_group = pci_device_group,
.get_dev_attr = intel_iommu_get_dev_attr,
+ .set_dev_attr = intel_iommu_set_dev_attr,
.pgsize_bitmap = INTEL_IOMMU_PGSIZES,
};

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index d174724e131f..6b198e13e75e 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -552,6 +552,7 @@ struct device_domain_info {
u8 pri_enabled:1;
u8 ats_supported:1;
u8 ats_enabled:1;
+ u8 auxd_enabled:1; /* Multiple domains per device */
u8 ats_qdep;
struct device *dev; /* it's NULL for PCIe-to-PCI bridge */
struct intel_iommu *iommu; /* IOMMU used by this device */
--
2.17.1