drm/xe/uapi: Add XE_ENGINE_GET_PROPERTY uAPI

This is intended to get some properties that are of interest of UMDs
like the ban state.

Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_device.c

@@ -89,6 +89,8 @@ static const struct drm_ioctl_desc xe_ioctls[] = {
 	DRM_IOCTL_DEF_DRV(XE_VM_BIND, xe_vm_bind_ioctl, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(XE_ENGINE_CREATE, xe_engine_create_ioctl,
 			  DRM_RENDER_ALLOW),
+	DRM_IOCTL_DEF_DRV(XE_ENGINE_GET_PROPERTY, xe_engine_get_property_ioctl,
+			  DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(XE_ENGINE_DESTROY, xe_engine_destroy_ioctl,
 			  DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(XE_EXEC, xe_exec_ioctl, DRM_RENDER_ALLOW),

drivers/gpu/drm/xe/xe_engine.c

@@ -639,6 +639,32 @@ int xe_engine_create_ioctl(struct drm_device *dev, void *data,
 	return err;
 }
 
+int xe_engine_get_property_ioctl(struct drm_device *dev, void *data,
+				 struct drm_file *file)
+{
+	struct xe_device *xe = to_xe_device(dev);
+	struct xe_file *xef = to_xe_file(file);
+	struct drm_xe_engine_get_property *args = data;
+	struct xe_engine *e;
+
+	mutex_lock(&xef->engine.lock);
+	e = xa_load(&xef->engine.xa, args->engine_id);
+	mutex_unlock(&xef->engine.lock);
+
+	if (XE_IOCTL_ERR(xe, !e))
+		return -ENOENT;
+
+	switch (args->property) {
+	case XE_ENGINE_GET_PROPERTY_BAN:
+		args->value = !!(e->flags & ENGINE_FLAG_BANNED);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static void engine_kill_compute(struct xe_engine *e)
 {
 	if (!xe_vm_in_compute_mode(e->vm))

drivers/gpu/drm/xe/xe_engine.h

@@ -50,5 +50,7 @@ int xe_engine_destroy_ioctl(struct drm_device *dev, void *data,
 			    struct drm_file *file);
 int xe_engine_set_property_ioctl(struct drm_device *dev, void *data,
 				 struct drm_file *file);
+int xe_engine_get_property_ioctl(struct drm_device *dev, void *data,
+				 struct drm_file *file);
 
 #endif

include/uapi/drm/xe_drm.h

@@ -118,6 +118,7 @@ struct xe_user_extension {
 #define DRM_XE_ENGINE_SET_PROPERTY	0x0a
 #define DRM_XE_WAIT_USER_FENCE		0x0b
 #define DRM_XE_VM_MADVISE		0x0c
+#define DRM_XE_ENGINE_GET_PROPERTY	0x0d
 
 /* Must be kept compact -- no holes */
 #define DRM_IOCTL_XE_DEVICE_QUERY		DRM_IOWR(DRM_COMMAND_BASE + DRM_XE_DEVICE_QUERY, struct drm_xe_device_query)
@@ -127,6 +128,7 @@ struct xe_user_extension {
 #define DRM_IOCTL_XE_VM_DESTROY			DRM_IOW( DRM_COMMAND_BASE + DRM_XE_VM_DESTROY, struct drm_xe_vm_destroy)
 #define DRM_IOCTL_XE_VM_BIND			DRM_IOW( DRM_COMMAND_BASE + DRM_XE_VM_BIND, struct drm_xe_vm_bind)
 #define DRM_IOCTL_XE_ENGINE_CREATE		DRM_IOWR(DRM_COMMAND_BASE + DRM_XE_ENGINE_CREATE, struct drm_xe_engine_create)
+#define DRM_IOCTL_XE_ENGINE_GET_PROPERTY	DRM_IOWR(DRM_COMMAND_BASE + DRM_XE_ENGINE_GET_PROPERTY, struct drm_xe_engine_get_property)
 #define DRM_IOCTL_XE_ENGINE_DESTROY		DRM_IOW( DRM_COMMAND_BASE + DRM_XE_ENGINE_DESTROY, struct drm_xe_engine_destroy)
 #define DRM_IOCTL_XE_EXEC			DRM_IOW( DRM_COMMAND_BASE + DRM_XE_EXEC, struct drm_xe_exec)
 #define DRM_IOCTL_XE_MMIO			DRM_IOWR(DRM_COMMAND_BASE + DRM_XE_MMIO, struct drm_xe_mmio)
@@ -568,8 +570,26 @@ struct drm_xe_engine_create {
 	__u64 reserved[2];
 };
 
+struct drm_xe_engine_get_property {
+	/** @extensions: Pointer to the first extension struct, if any */
+	__u64 extensions;
+
+	/** @engine_id: Engine ID */
+	__u32 engine_id;
+
+	/** @property: property to get */
+#define XE_ENGINE_GET_PROPERTY_BAN			0
+	__u32 property;
+
+	/** @value: property value */
+	__u64 value;
+
+	/** @reserved: Reserved */
+	__u64 reserved[2];
+};
+
 struct drm_xe_engine_destroy {
-	/** @vm_id: VM ID */
+	/** @engine_id: Engine ID */
 	__u32 engine_id;
 
 	/** @pad: MBZ */