1 files changed, 334 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/core/object.c b/drivers/gpu/drm/nouveau/nvkm/core/object.c
new file mode 100644
index 000000000000..b160860edf54
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/core/object.c
@@ -0,0 +1,334 @@
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#include <core/object.h>
+#include <core/engine.h>
+
+#ifdef NOUVEAU_OBJECT_MAGIC
+static struct list_head _objlist = LIST_HEAD_INIT(_objlist);
+static DEFINE_SPINLOCK(_objlist_lock);
+#endif
+
+int
+nouveau_object_create_(struct nouveau_object *parent,
+		       struct nouveau_object *engine,
+		       struct nouveau_oclass *oclass, u32 pclass,
+		       int size, void **pobject)
+{
+	struct nouveau_object *object;
+
+	object = *pobject = kzalloc(size, GFP_KERNEL);
+	if (!object)
+		return -ENOMEM;
+
+	nouveau_object_ref(parent, &object->parent);
+	nouveau_object_ref(engine, (struct nouveau_object **)&object->engine);
+	object->oclass = oclass;
+	object->oclass->handle |= pclass;
+	atomic_set(&object->refcount, 1);
+	atomic_set(&object->usecount, 0);
+
+#ifdef NOUVEAU_OBJECT_MAGIC
+	object->_magic = NOUVEAU_OBJECT_MAGIC;
+	spin_lock(&_objlist_lock);
+	list_add(&object->list, &_objlist);
+	spin_unlock(&_objlist_lock);
+#endif
+	return 0;
+}
+
+int
+_nouveau_object_ctor(struct nouveau_object *parent,
+		     struct nouveau_object *engine,
+		     struct nouveau_oclass *oclass, void *data, u32 size,
+		     struct nouveau_object **pobject)
+{
+	if (size != 0)
+		return -ENOSYS;
+	return nouveau_object_create(parent, engine, oclass, 0, pobject);
+}
+
+void
+nouveau_object_destroy(struct nouveau_object *object)
+{
+#ifdef NOUVEAU_OBJECT_MAGIC
+	spin_lock(&_objlist_lock);
+	list_del(&object->list);
+	spin_unlock(&_objlist_lock);
+#endif
+	nouveau_object_ref(NULL, (struct nouveau_object **)&object->engine);
+	nouveau_object_ref(NULL, &object->parent);
+	kfree(object);
+}
+
+int
+nouveau_object_init(struct nouveau_object *object)
+{
+	return 0;
+}
+
+int
+nouveau_object_fini(struct nouveau_object *object, bool suspend)
+{
+	return 0;
+}
+
+struct nouveau_ofuncs
+nouveau_object_ofuncs = {
+	.ctor = _nouveau_object_ctor,
+	.dtor = nouveau_object_destroy,
+	.init = nouveau_object_init,
+	.fini = nouveau_object_fini,
+};
+
+int
+nouveau_object_ctor(struct nouveau_object *parent,
+		    struct nouveau_object *engine,
+		    struct nouveau_oclass *oclass, void *data, u32 size,
+		    struct nouveau_object **pobject)
+{
+	struct nouveau_ofuncs *ofuncs = oclass->ofuncs;
+	struct nouveau_object *object = NULL;
+	int ret;
+
+	ret = ofuncs->ctor(parent, engine, oclass, data, size, &object);
+	*pobject = object;
+	if (ret < 0) {
+		if (ret != -ENODEV) {
+			nv_error(parent, "failed to create 0x%08x, %d\n",
+				 oclass->handle, ret);
+		}
+
+		if (object) {
+			ofuncs->dtor(object);
+			*pobject = NULL;
+		}
+
+		return ret;
+	}
+
+	if (ret == 0) {
+		nv_trace(object, "created\n");
+		atomic_set(&object->refcount, 1);
+	}
+
+	return 0;
+}
+
+static void
+nouveau_object_dtor(struct nouveau_object *object)
+{
+	nv_trace(object, "destroying\n");
+	nv_ofuncs(object)->dtor(object);
+}
+
+void
+nouveau_object_ref(struct nouveau_object *obj, struct nouveau_object **ref)
+{
+	if (obj) {
+		atomic_inc(&obj->refcount);
+		nv_trace(obj, "inc() == %d\n", atomic_read(&obj->refcount));
+	}
+
+	if (*ref) {
+		int dead = atomic_dec_and_test(&(*ref)->refcount);
+		nv_trace(*ref, "dec() == %d\n", atomic_read(&(*ref)->refcount));
+		if (dead)
+			nouveau_object_dtor(*ref);
+	}
+
+	*ref = obj;
+}
+
+int
+nouveau_object_inc(struct nouveau_object *object)
+{
+	int ref = atomic_add_return(1, &object->usecount);
+	int ret;
+
+	nv_trace(object, "use(+1) == %d\n", atomic_read(&object->usecount));
+	if (ref != 1)
+		return 0;
+
+	nv_trace(object, "initialising...\n");
+	if (object->parent) {
+		ret = nouveau_object_inc(object->parent);
+		if (ret) {
+			nv_error(object, "parent failed, %d\n", ret);
+			goto fail_parent;
+		}
+	}
+
+	if (object->engine) {
+		mutex_lock(&nv_subdev(object->engine)->mutex);
+		ret = nouveau_object_inc(&object->engine->subdev.object);
+		mutex_unlock(&nv_subdev(object->engine)->mutex);
+		if (ret) {
+			nv_error(object, "engine failed, %d\n", ret);
+			goto fail_engine;
+		}
+	}
+
+	ret = nv_ofuncs(object)->init(object);
+	atomic_set(&object->usecount, 1);
+	if (ret) {
+		nv_error(object, "init failed, %d\n", ret);
+		goto fail_self;
+	}
+
+	nv_trace(object, "initialised\n");
+	return 0;
+
+fail_self:
+	if (object->engine) {
+		mutex_lock(&nv_subdev(object->engine)->mutex);
+		nouveau_object_dec(&object->engine->subdev.object, false);
+		mutex_unlock(&nv_subdev(object->engine)->mutex);
+	}
+fail_engine:
+	if (object->parent)
+		 nouveau_object_dec(object->parent, false);
+fail_parent:
+	atomic_dec(&object->usecount);
+	return ret;
+}
+
+static int
+nouveau_object_decf(struct nouveau_object *object)
+{
+	int ret;
+
+	nv_trace(object, "stopping...\n");
+
+	ret = nv_ofuncs(object)->fini(object, false);
+	atomic_set(&object->usecount, 0);
+	if (ret)
+		nv_warn(object, "failed fini, %d\n", ret);
+
+	if (object->engine) {
+		mutex_lock(&nv_subdev(object->engine)->mutex);
+		nouveau_object_dec(&object->engine->subdev.object, false);
+		mutex_unlock(&nv_subdev(object->engine)->mutex);
+	}
+
+	if (object->parent)
+		nouveau_object_dec(object->parent, false);
+
+	nv_trace(object, "stopped\n");
+	return 0;
+}
+
+static int
+nouveau_object_decs(struct nouveau_object *object)
+{
+	int ret, rret;
+
+	nv_trace(object, "suspending...\n");
+
+	ret = nv_ofuncs(object)->fini(object, true);
+	atomic_set(&object->usecount, 0);
+	if (ret) {
+		nv_error(object, "failed suspend, %d\n", ret);
+		return ret;
+	}
+
+	if (object->engine) {
+		mutex_lock(&nv_subdev(object->engine)->mutex);
+		ret = nouveau_object_dec(&object->engine->subdev.object, true);
+		mutex_unlock(&nv_subdev(object->engine)->mutex);
+		if (ret) {
+			nv_warn(object, "engine failed suspend, %d\n", ret);
+			goto fail_engine;
+		}
+	}
+
+	if (object->parent) {
+		ret = nouveau_object_dec(object->parent, true);
+		if (ret) {
+			nv_warn(object, "parent failed suspend, %d\n", ret);
+			goto fail_parent;
+		}
+	}
+
+	nv_trace(object, "suspended\n");
+	return 0;
+
+fail_parent:
+	if (object->engine) {
+		mutex_lock(&nv_subdev(object->engine)->mutex);
+		rret = nouveau_object_inc(&object->engine->subdev.object);
+		mutex_unlock(&nv_subdev(object->engine)->mutex);
+		if (rret)
+			nv_fatal(object, "engine failed to reinit, %d\n", rret);
+	}
+
+fail_engine:
+	rret = nv_ofuncs(object)->init(object);
+	if (rret)
+		nv_fatal(object, "failed to reinit, %d\n", rret);
+
+	return ret;
+}
+
+int
+nouveau_object_dec(struct nouveau_object *object, bool suspend)
+{
+	int ref = atomic_add_return(-1, &object->usecount);
+	int ret;
+
+	nv_trace(object, "use(-1) == %d\n", atomic_read(&object->usecount));
+
+	if (ref == 0) {
+		if (suspend)
+			ret = nouveau_object_decs(object);
+		else
+			ret = nouveau_object_decf(object);
+
+		if (ret) {
+			atomic_inc(&object->usecount);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+void
+nouveau_object_debug(void)
+{
+#ifdef NOUVEAU_OBJECT_MAGIC
+	struct nouveau_object *object;
+	if (!list_empty(&_objlist)) {
+		nv_fatal(NULL, "*******************************************\n");
+		nv_fatal(NULL, "* AIIIII! object(s) still exist!!!\n");
+		nv_fatal(NULL, "*******************************************\n");
+		list_for_each_entry(object, &_objlist, list) {
+			nv_fatal(object, "%p/%p/%d/%d\n",
+				 object->parent, object->engine,
+				 atomic_read(&object->refcount),
+				 atomic_read(&object->usecount));
+		}
+	}
+#endif
+}