iommu/vt-d: Add callback to device driver on page faults
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/include/linux/intel-svm.h b/include/linux/intel-svm.h
index 42f80ad..239f8a1 100644
--- a/include/linux/intel-svm.h
+++ b/include/linux/intel-svm.h
@@ -20,10 +20,23 @@
struct device;
+struct svm_dev_ops {
+ void (*fault_cb)(struct device *dev, int pasid, u64 address,
+ u32 private, int rwxp, int response);
+};
+
+/* Values for rxwp in fault_cb callback */
+#define SVM_REQ_READ (1<<3)
+#define SVM_REQ_WRITE (1<<2)
+#define SVM_REQ_EXEC (1<<1)
+#define SVM_REQ_PRIV (1<<0)
+
/**
* intel_svm_bind_mm() - Bind the current process to a PASID
* @dev: Device to be granted acccess
* @pasid: Address for allocated PASID
+ * @flags: Flags. Later for requesting supervisor mode, etc.
+ * @ops: Callbacks to device driver
*
* This function attempts to enable PASID support for the given device.
* If the @pasid argument is non-%NULL, a PASID is allocated for access
@@ -45,7 +58,8 @@
* Multiple calls from the same process may result in the same PASID
* being re-used. A reference count is kept.
*/
-extern int intel_svm_bind_mm(struct device *dev, int *pasid);
+extern int intel_svm_bind_mm(struct device *dev, int *pasid, int flags,
+ struct svm_dev_ops *ops);
/**
* intel_svm_unbind_mm() - Unbind a specified PASID
@@ -66,7 +80,8 @@
#else /* CONFIG_INTEL_IOMMU_SVM */
-static inline int intel_svm_bind_mm(struct device *dev, int *pasid)
+static inline int intel_svm_bind_mm(struct device *dev, int *pasid,
+ int flags, struct svm_dev_ops *ops)
{
return -ENOSYS;
}
@@ -77,6 +92,6 @@
}
#endif /* CONFIG_INTEL_IOMMU_SVM */
-#define intel_svm_available(dev) (!intel_svm_bind_mm((dev), NULL))
+#define intel_svm_available(dev) (!intel_svm_bind_mm((dev), NULL, 0, NULL))
#endif /* __INTEL_SVM_H__ */