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Subject[RFC PATCH 01/10] iommu/vt-d: Get iommu device for a mediated device
Date
This patch adds the support to get the iommu device for a mediated
device. The assumption is that each mediated device is a minimal
assignable set of a physical PCI device. Hence, we should use the
iommu device of the parent PCI device to manage the translation.

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: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 6 ++++++
drivers/iommu/intel-pasid.h | 16 ++++++++++++++++
2 files changed, 22 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 7d198ea..fc3ac1c 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -767,6 +767,12 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf
if (iommu_dummy(dev))
return NULL;

+ if (dev_is_mdev(dev)) {
+ dev = dev_mdev_parent(dev);
+ if (WARN_ON(!dev_is_pci(dev)))
+ return NULL;
+ }
+
if (dev_is_pci(dev)) {
struct pci_dev *pf_pdev;

diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h
index 518df72..46cde66 100644
--- a/drivers/iommu/intel-pasid.h
+++ b/drivers/iommu/intel-pasid.h
@@ -35,6 +35,22 @@ struct pasid_table {
struct list_head dev; /* device list */
};

+static inline bool dev_is_mdev(struct device *dev)
+{
+ if (!dev)
+ return false;
+
+ return !strcmp(dev->bus->name, "mdev");
+}
+
+static inline struct device *dev_mdev_parent(struct device *dev)
+{
+ if (WARN_ON(!dev_is_mdev(dev)))
+ return NULL;
+
+ return dev->parent;
+}
+
extern u32 intel_pasid_max_id;
int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
void intel_pasid_free_id(int pasid);
--
2.7.4
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