+drm_private int
+abi16_sclass(struct nouveau_object *obj, struct nouveau_sclass **psclass)
+{
+ struct nouveau_sclass *sclass;
+ struct nouveau_device *dev;
+
+ if (!(sclass = calloc(8, sizeof(*sclass))))
+ return -ENOMEM;
+ *psclass = sclass;
+
+ switch (obj->oclass) {
+ case NOUVEAU_FIFO_CHANNEL_CLASS:
+ /* Older kernel versions were exposing the wrong video engine
+ * classes on certain G98:GF100 boards. This has since been
+ * corrected, but ABI16 has compatibility in place to avoid
+ * breaking older userspace.
+ *
+ * Clients that have been updated to use NVIF are required to
+ * use the correct classes, which means that they'll break if
+ * running on an older kernel.
+ *
+ * To handle this issue, if using the older kernel interfaces,
+ * we'll magic up a list containing the vdec classes that the
+ * kernel will accept for these boards. Clients should make
+ * use of this information instead of hardcoding classes for
+ * specific chipsets.
+ */
+ dev = (struct nouveau_device *)obj->parent;
+ if (dev->chipset >= 0x98 &&
+ dev->chipset != 0xa0 &&
+ dev->chipset < 0xc0) {
+ *sclass++ = (struct nouveau_sclass){
+ GT212_MSVLD, -1, -1
+ };
+ *sclass++ = (struct nouveau_sclass){
+ GT212_MSPDEC, -1, -1
+ };
+ *sclass++ = (struct nouveau_sclass){
+ GT212_MSPPP, -1, -1
+ };
+ }
+ break;
+ default:
+ break;
+ }
+
+ return sclass - *psclass;
+}
+
+drm_private void
+abi16_delete(struct nouveau_object *obj)
+{
+ struct nouveau_drm *drm = nouveau_drm(obj);
+ if (obj->oclass == NOUVEAU_FIFO_CHANNEL_CLASS) {
+ struct drm_nouveau_channel_free req;
+ req.channel = obj->handle;
+ drmCommandWrite(drm->fd, DRM_NOUVEAU_CHANNEL_FREE,
+ &req, sizeof(req));
+ } else {
+ struct drm_nouveau_gpuobj_free req;
+ req.channel = obj->parent->handle;
+ req.handle = obj->handle;
+ drmCommandWrite(drm->fd, DRM_NOUVEAU_GPUOBJ_FREE,
+ &req, sizeof(req));
+ }
+}
+
+drm_private bool
+abi16_object(struct nouveau_object *obj, int (**func)(struct nouveau_object *))
+{
+ struct nouveau_object *parent = obj->parent;
+
+ /* nouveau_object::length is (ab)used to determine whether the
+ * object is a legacy object (!=0), or a real NVIF object.
+ */
+ if ((parent->length != 0 && parent->oclass == NOUVEAU_DEVICE_CLASS) ||
+ (parent->length == 0 && parent->oclass == NV_DEVICE)) {
+ if (obj->oclass == NOUVEAU_FIFO_CHANNEL_CLASS) {
+ struct nouveau_device *dev = (void *)parent;
+ if (dev->chipset < 0xc0)
+ *func = abi16_chan_nv04;
+ else
+ if (dev->chipset < 0xe0)
+ *func = abi16_chan_nvc0;
+ else
+ *func = abi16_chan_nve0;
+ return true;
+ }
+ } else
+ if ((parent->length != 0 &&
+ parent->oclass == NOUVEAU_FIFO_CHANNEL_CLASS)) {
+ if (obj->oclass == NOUVEAU_NOTIFIER_CLASS) {
+ *func = abi16_ntfy;
+ return true;
+ }
+
+ *func = abi16_engobj;
+ return false; /* try NVIF, if supported, before calling func */
+ }
+
+ *func = NULL;
+ return false;
+}
+
+drm_private void