iommu/amd: Add routines to bind/unbind a pasid

This patch adds routines to bind a specific process
address-space to a given PASID.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/linux/amd-iommu.h b/include/linux/amd-iommu.h
index e8c7a2ec86b3..23e21e15dfab 100644
--- a/include/linux/amd-iommu.h
+++ b/include/linux/amd-iommu.h
@@ -24,9 +24,13 @@
 
 #ifdef CONFIG_AMD_IOMMU
 
+struct task_struct;
 struct pci_dev;
 
 extern int amd_iommu_detect(void);
+extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
+                                struct task_struct *task);
+extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
 
 
 /**
@@ -65,6 +69,28 @@ extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
  */
 extern void amd_iommu_free_device(struct pci_dev *pdev);
 
+/**
+ * amd_iommu_bind_pasid() - Bind a given task to a PASID on a device
+ * @pdev: The PCI device to bind the task to
+ * @pasid: The PASID on the device the task should be bound to
+ * @task: the task to bind
+ *
+ * The function returns 0 on success or a negative value on error.
+ */
+extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
+                                struct task_struct *task);
+
+/**
+ * amd_iommu_unbind_pasid() - Unbind a PASID from its task on
+ *                            a device
+ * @pdev: The device of the PASID
+ * @pasid: The PASID to unbind
+ *
+ * When this function returns the device is no longer using the PASID
+ * and the PASID is no longer bound to its task.
+ */
+extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
+
 #else
 
 static inline int amd_iommu_detect(void) { return -ENODEV; }