drm/xe/uapi: Define drm_xe_vm_get_property

Add initial declarations for the drm_xe_vm_get_property ioctl.

v2:
- Expand kernel docs for drm_xe_vm_get_property (Jianxun)

v3:
- Remove address type external definitions (Jianxun)
- Add fault type to xe_drm_fault struct (Jianxun)

v4:
- Remove engine class and instance (Ivan)

v5:
- Add declares for fault type, access type, and fault level (Matt Brost,
  Ivan)

v6:
- Fix inconsistent use of whitespace in defines

v7:
- Rebase and refactor (jcavitt)

v8:
- Rebase (jcavitt)

v9:
- Clarify address is canonical (José)

v10:
- s/uAPI/Link in the commit log links

Link: intel/compute-runtime#878
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Shuicheng Lin <shuicheng.lin@intel.com>
Acked-by: Matthew Brost <matthew.brost@intel.com>
Acked-by: Ivan Briano <ivan.briano@intel.com>
Acked-by: José Roberto de Souza <jose.souza@intel.com>
Cc: Zhang Jianxun <jianxun.zhang@intel.com>
Cc: Ivan Briano <ivan.briano@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>

Author: Jonathan-Cavitt

include/uapi/drm/xe_drm.h

@@ -83,6 +83,7 @@ extern "C" {
  *  - &DRM_IOCTL_XE_OBSERVATION
  *  - &DRM_IOCTL_XE_MADVISE
  *  - &DRM_IOCTL_XE_VM_QUERY_MEM_RANGE_ATTRS
+ *  - &DRM_IOCTL_XE_VM_GET_PROPERTY
  */
 
 /*
@@ -107,6 +108,7 @@ extern "C" {
 #define DRM_XE_MADVISE			0x0c
 #define DRM_XE_VM_QUERY_MEM_RANGE_ATTRS	0x0d
 #define DRM_XE_EXEC_QUEUE_SET_PROPERTY	0x0e
+#define DRM_XE_VM_GET_PROPERTY		0x0f
 
 /* Must be kept compact -- no holes */
 
@@ -125,6 +127,7 @@ extern "C" {
 #define DRM_IOCTL_XE_MADVISE			DRM_IOW(DRM_COMMAND_BASE + DRM_XE_MADVISE, struct drm_xe_madvise)
 #define DRM_IOCTL_XE_VM_QUERY_MEM_RANGE_ATTRS	DRM_IOWR(DRM_COMMAND_BASE + DRM_XE_VM_QUERY_MEM_RANGE_ATTRS, struct drm_xe_vm_query_mem_range_attr)
 #define DRM_IOCTL_XE_EXEC_QUEUE_SET_PROPERTY	DRM_IOW(DRM_COMMAND_BASE + DRM_XE_EXEC_QUEUE_SET_PROPERTY, struct drm_xe_exec_queue_set_property)
+#define DRM_IOCTL_XE_VM_GET_PROPERTY		DRM_IOWR(DRM_COMMAND_BASE + DRM_XE_VM_GET_PROPERTY, struct drm_xe_vm_get_property)
 
 /**
  * DOC: Xe IOCTL Extensions
@@ -1263,6 +1266,89 @@ struct drm_xe_vm_bind {
 	__u64 reserved[2];
 };
 
+/** struct xe_vm_fault - Describes faults for %DRM_XE_VM_GET_PROPERTY_FAULTS */
+struct xe_vm_fault {
+	/** @address: Canonical address of the fault */
+	__u64 address;
+	/** @address_precision: Precision of faulted address */
+	__u32 address_precision;
+	/** @access_type: Type of address access that resulted in fault */
+#define FAULT_ACCESS_TYPE_READ		0
+#define FAULT_ACCESS_TYPE_WRITE		1
+#define FAULT_ACCESS_TYPE_ATOMIC	2
+	__u8 access_type;
+	/** @fault_type: Type of fault reported */
+#define FAULT_TYPE_NOT_PRESENT		0
+#define FAULT_TYPE_WRITE_ACCESS		1
+#define FAULT_TYPE_ATOMIC_ACCESS	2
+	__u8 fault_type;
+	/** @fault_level: fault level of the fault */
+#define FAULT_LEVEL_PTE		0
+#define FAULT_LEVEL_PDE		1
+#define FAULT_LEVEL_PDP		2
+#define FAULT_LEVEL_PML4	3
+#define FAULT_LEVEL_PML5	4
+	__u8 fault_level;
+	/** @pad: MBZ */
+	__u8 pad;
+	/** @reserved: MBZ */
+	__u64 reserved[4];
+};
+
+/**
+ * struct drm_xe_vm_get_property - Input of &DRM_IOCTL_XE_VM_GET_PROPERTY
+ *
+ * The user provides a VM and a property to query among DRM_XE_VM_GET_PROPERTY_*,
+ * and sets the values in the vm_id and property members, respectively.  This
+ * determines both the VM to get the property of, as well as the property to
+ * report.
+ *
+ * If size is set to 0, the driver fills it with the required size for the
+ * requested property.  The user is expected here to allocate memory for the
+ * property structure and to provide a pointer to the allocated memory using the
+ * data member.  For some properties, this may be zero, in which case, the
+ * value of the property will be saved to the value member and size will remain
+ * zero on return.
+ *
+ * If size is not zero, then the IOCTL will attempt to copy the requested
+ * property into the data member.
+ *
+ * The IOCTL will return -ENOENT if the VM could not be identified from the
+ * provided VM ID, or -EINVAL if the IOCTL fails for any other reason, such as
+ * providing an invalid size for the given property or if the property data
+ * could not be copied to the memory allocated to the data member.
+ *
+ * The property member can be:
+ *  - %DRM_XE_VM_GET_PROPERTY_FAULTS
+ */
+struct drm_xe_vm_get_property {
+	/** @extensions: Pointer to the first extension struct, if any */
+	__u64 extensions;
+
+	/** @vm_id: The ID of the VM to query the properties of */
+	__u32 vm_id;
+
+#define DRM_XE_VM_GET_PROPERTY_FAULTS		0
+	/** @property: property to get */
+	__u32 property;
+
+	/** @size: Size to allocate for @data */
+	__u32 size;
+
+	/** @pad: MBZ */
+	__u32 pad;
+
+	union {
+		/** @data: Pointer to user-defined array of flexible size and type */
+		__u64 data;
+		/** @value: Return value for scalar queries */
+		__u64 value;
+	};
+
+	/** @reserved: MBZ */
+	__u64 reserved[3];
+};
+
 /**
  * struct drm_xe_exec_queue_create - Input of &DRM_IOCTL_XE_EXEC_QUEUE_CREATE
  *