nvif: simplify and tidy library interfaces

A variety of tweaks to the NVIF library interfaces, mostly ripping out
things that turned out to be not so useful.

- Removed refcounting from nvif_object, callers are expected to not be
  stupid instead.
- nvif_client is directly reachable from anything derived from nvif_object,
  removing the need for heuristics to locate it
- _new() versions of interfaces, that allocate memory for the object
  they construct, have been removed.  The vast majority of callers used
  the embedded _init() interfaces.
- No longer storing constructor arguments (and the data returned from
  nvkm) inside nvif_object, it's more or less unused and just wastes
  memory.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

4 files changed, 68 insertions, 222 deletions

diff --git a/drm/nouveau/nvif/client.c b/drm/nouveau/nvif/client.c
index 80b968442..4a830ebf9 100644
--- a/drm/nouveau/nvif/client.c
+++ b/drm/nouveau/nvif/client.c
@@ -29,29 +29,30 @@
 int
 nvif_client_ioctl(struct nvif_client *client, void *data, u32 size)
 {
-	return client->driver->ioctl(client->base.priv, client->super, data, size, NULL);
+	return client->driver->ioctl(client->object.priv, client->super, data, size, NULL);
 }
 
 int
 nvif_client_suspend(struct nvif_client *client)
 {
-	return client->driver->suspend(client->base.priv);
+	return client->driver->suspend(client->object.priv);
 }
 
 int
 nvif_client_resume(struct nvif_client *client)
 {
-	return client->driver->resume(client->base.priv);
+	return client->driver->resume(client->object.priv);
 }
 
 void
 nvif_client_fini(struct nvif_client *client)
 {
 	if (client->driver) {
-		client->driver->fini(client->base.priv);
+		client->driver->fini(client->object.priv);
 		client->driver = NULL;
-		client->base.parent = NULL;
-		nvif_object_fini(&client->base);
+		client->object.parent = NULL;
+		client->object.client = NULL;
+		nvif_object_fini(&client->object);
 	}
 }
 
@@ -68,25 +69,25 @@ nvif_drivers[] = {
 };
 
 int
-nvif_client_init(void (*dtor)(struct nvif_client *), const char *driver,
-		 const char *name, u64 device, const char *cfg, const char *dbg,
-		 struct nvif_client *client)
+nvif_client_init(const char *driver, const char *name, u64 device,
+		 const char *cfg, const char *dbg, struct nvif_client *client)
 {
 	int ret, i;
 
-	ret = nvif_object_init(NULL, (void*)dtor, 0, 0, NULL, 0, &client->base);
+	ret = nvif_object_init(NULL, 0, 0, NULL, 0, &client->object);
 	if (ret)
 		return ret;
 
-	client->base.parent = &client->base;
-	client->base.handle = ~0;
-	client->object = &client->base;
+	client->object.client = client;
+	client->object.parent = &client->object;
+	client->object.handle = ~0;
+	client->route = NVIF_IOCTL_V0_ROUTE_NVIF;
 	client->super = true;
 
 	for (i = 0, ret = -EINVAL; (client->driver = nvif_drivers[i]); i++) {
 		if (!driver || !strcmp(client->driver->name, driver)) {
 			ret = client->driver->init(name, device, cfg, dbg,
-						  &client->base.priv);
+						  &client->object.priv);
 			if (!ret || driver)
 				break;
 		}
@@ -96,35 +97,3 @@ nvif_client_init(void (*dtor)(struct nvif_client *), const char *driver,
 		nvif_client_fini(client);
 	return ret;
 }
-
-static void
-nvif_client_del(struct nvif_client *client)
-{
-	nvif_client_fini(client);
-	kfree(client);
-}
-
-int
-nvif_client_new(const char *driver, const char *name, u64 device,
-		const char *cfg, const char *dbg,
-		struct nvif_client **pclient)
-{
-	struct nvif_client *client = kzalloc(sizeof(*client), GFP_KERNEL);
-	if (client) {
-		int ret = nvif_client_init(nvif_client_del, driver, name,
-					   device, cfg, dbg, client);
-		if (ret) {
-			kfree(client);
-			client = NULL;
-		}
-		*pclient = client;
-		return ret;
-	}
-	return -ENOMEM;
-}
-
-void
-nvif_client_ref(struct nvif_client *client, struct nvif_client **pclient)
-{
-	nvif_object_ref(&client->base, (struct nvif_object **)pclient);
-}
diff --git a/drm/nouveau/nvif/device.c b/drm/nouveau/nvif/device.c
index 837442c69..f15d51a69 100644
--- a/drm/nouveau/nvif/device.c
+++ b/drm/nouveau/nvif/device.c
@@ -33,52 +33,19 @@ nvif_device_time(struct nvif_device *device)
 void
 nvif_device_fini(struct nvif_device *device)
 {
-	nvif_object_fini(&device->base);
+	nvif_object_fini(&device->object);
 }
 
 int
-nvif_device_init(struct nvif_object *parent, void (*dtor)(struct nvif_device *),
-		 u32 handle, u32 oclass, void *data, u32 size,
-		 struct nvif_device *device)
+nvif_device_init(struct nvif_object *parent, u32 handle, u32 oclass,
+		 void *data, u32 size, struct nvif_device *device)
 {
-	int ret = nvif_object_init(parent, (void *)dtor, handle, oclass,
-				   data, size, &device->base);
+	int ret = nvif_object_init(parent, handle, oclass, data, size,
+				   &device->object);
 	if (ret == 0) {
-		device->object = &device->base;
 		device->info.version = 0;
-		ret = nvif_object_mthd(&device->base, NV_DEVICE_V0_INFO,
+		ret = nvif_object_mthd(&device->object, NV_DEVICE_V0_INFO,
 				       &device->info, sizeof(device->info));
 	}
 	return ret;
 }
-
-static void
-nvif_device_del(struct nvif_device *device)
-{
-	nvif_device_fini(device);
-	kfree(device);
-}
-
-int
-nvif_device_new(struct nvif_object *parent, u32 handle, u32 oclass,
-		void *data, u32 size, struct nvif_device **pdevice)
-{
-	struct nvif_device *device = kzalloc(sizeof(*device), GFP_KERNEL);
-	if (device) {
-		int ret = nvif_device_init(parent, nvif_device_del, handle,
-					   oclass, data, size, device);
-		if (ret) {
-			kfree(device);
-			device = NULL;
-		}
-		*pdevice = device;
-		return ret;
-	}
-	return -ENOMEM;
-}
-
-void
-nvif_device_ref(struct nvif_device *device, struct nvif_device **pdevice)
-{
-	nvif_object_ref(&device->base, (struct nvif_object **)pdevice);
-}
diff --git a/drm/nouveau/nvif/notify.c b/drm/nouveau/nvif/notify.c
index 8e3474870..b0787ff83 100644
--- a/drm/nouveau/nvif/notify.c
+++ b/drm/nouveau/nvif/notify.c
@@ -124,7 +124,7 @@ nvif_notify(const void *header, u32 length, const void *data, u32 size)
 	}
 
 	if (!WARN_ON(notify == NULL)) {
-		struct nvif_client *client = nvif_client(notify->object);
+		struct nvif_client *client = notify->object->client;
 		if (!WARN_ON(notify->size != size)) {
 			atomic_inc(&notify->putcnt);
 			if (test_bit(NVIF_NOTIFY_WORK, &notify->flags)) {
@@ -156,7 +156,7 @@ nvif_notify_fini(struct nvif_notify *notify)
 	if (ret >= 0 && object) {
 		ret = nvif_object_ioctl(object, &args, sizeof(args), NULL);
 		if (ret == 0) {
-			nvif_object_ref(NULL, &notify->object);
+			notify->object = NULL;
 			kfree((void *)notify->data);
 		}
 	}
@@ -164,9 +164,9 @@ nvif_notify_fini(struct nvif_notify *notify)
 }
 
 int
-nvif_notify_init(struct nvif_object *object, void (*dtor)(struct nvif_notify *),
-		 int (*func)(struct nvif_notify *), bool work, u8 event,
-		 void *data, u32 size, u32 reply, struct nvif_notify *notify)
+nvif_notify_init(struct nvif_object *object, int (*func)(struct nvif_notify *),
+		 bool work, u8 event, void *data, u32 size, u32 reply,
+		 struct nvif_notify *notify)
 {
 	struct {
 		struct nvif_ioctl_v0 ioctl;
@@ -175,11 +175,9 @@ nvif_notify_init(struct nvif_object *object, void (*dtor)(struct nvif_notify *),
 	} *args;
 	int ret = -ENOMEM;
 
-	notify->object = NULL;
-	nvif_object_ref(object, &notify->object);
+	notify->object = object;
 	notify->flags = 0;
 	atomic_set(&notify->putcnt, 1);
-	notify->dtor = dtor;
 	notify->func = func;
 	notify->data = NULL;
 	notify->size = reply;
@@ -211,38 +209,3 @@ done:
 		nvif_notify_fini(notify);
 	return ret;
 }
-
-static void
-nvif_notify_del(struct nvif_notify *notify)
-{
-	nvif_notify_fini(notify);
-	kfree(notify);
-}
-
-void
-nvif_notify_ref(struct nvif_notify *notify, struct nvif_notify **pnotify)
-{
-	BUG_ON(notify != NULL);
-	if (*pnotify)
-		(*pnotify)->dtor(*pnotify);
-	*pnotify = notify;
-}
-
-int
-nvif_notify_new(struct nvif_object *object, int (*func)(struct nvif_notify *),
-		bool work, u8 type, void *data, u32 size, u32 reply,
-		struct nvif_notify **pnotify)
-{
-	struct nvif_notify *notify = kzalloc(sizeof(*notify), GFP_KERNEL);
-	if (notify) {
-		int ret = nvif_notify_init(object, nvif_notify_del, func, work,
-					   type, data, size, reply, notify);
-		if (ret) {
-			kfree(notify);
-			notify = NULL;
-		}
-		*pnotify = notify;
-		return ret;
-	}
-	return -ENOMEM;
-}
diff --git a/drm/nouveau/nvif/object.c b/drm/nouveau/nvif/object.c
index 3ab4e2f8c..a727f72ca 100644
--- a/drm/nouveau/nvif/object.c
+++ b/drm/nouveau/nvif/object.c
@@ -30,7 +30,7 @@
 int
 nvif_object_ioctl(struct nvif_object *object, void *data, u32 size, void **hack)
 {
-	struct nvif_client *client = nvif_client(object);
+	struct nvif_client *client = object->client;
 	union {
 		struct nvif_ioctl_v0 v0;
 	} *args = data;
@@ -47,7 +47,8 @@ nvif_object_ioctl(struct nvif_object *object, void *data, u32 size, void **hack)
 	} else
 		return -ENOSYS;
 
-	return client->driver->ioctl(client->base.priv, client->super, data, size, hack);
+	return client->driver->ioctl(client->object.priv, client->super,
+				     data, size, hack);
 }
 
 int
@@ -145,7 +146,7 @@ void
 nvif_object_unmap(struct nvif_object *object)
 {
 	if (object->map.size) {
-		struct nvif_client *client = nvif_client(object);
+		struct nvif_client *client = object->client;
 		struct {
 			struct nvif_ioctl_v0 ioctl;
 			struct nvif_ioctl_unmap unmap;
@@ -167,7 +168,7 @@ nvif_object_unmap(struct nvif_object *object)
 int
 nvif_object_map(struct nvif_object *object)
 {
-	struct nvif_client *client = nvif_client(object);
+	struct nvif_client *client = object->client;
 	struct {
 		struct nvif_ioctl_v0 ioctl;
 		struct nvif_ioctl_map_v0 map;
@@ -186,119 +187,65 @@ nvif_object_map(struct nvif_object *object)
 	return ret;
 }
 
-struct ctor {
-	struct nvif_ioctl_v0 ioctl;
-	struct nvif_ioctl_new_v0 new;
-};
-
 void
 nvif_object_fini(struct nvif_object *object)
 {
-	struct ctor *ctor = container_of(object->data, typeof(*ctor), new.data);
-	if (object->parent) {
-		struct {
-			struct nvif_ioctl_v0 ioctl;
-			struct nvif_ioctl_del del;
-		} args = {
-			.ioctl.type = NVIF_IOCTL_V0_DEL,
-		};
+	struct {
+		struct nvif_ioctl_v0 ioctl;
+		struct nvif_ioctl_del del;
+	} args = {
+		.ioctl.type = NVIF_IOCTL_V0_DEL,
+	};
 
-		nvif_object_unmap(object);
-		nvif_object_ioctl(object, &args, sizeof(args), NULL);
-		if (object->data) {
-			object->size = 0;
-			object->data = NULL;
-			kfree(ctor);
-		}
-		nvif_object_ref(NULL, &object->parent);
-	}
+	if (!object->client)
+		return;
+
+	nvif_object_unmap(object);
+	nvif_object_ioctl(object, &args, sizeof(args), NULL);
+	object->client = NULL;
 }
 
 int
-nvif_object_init(struct nvif_object *parent, void (*dtor)(struct nvif_object *),
-		 u32 handle, u32 oclass, void *data, u32 size,
-		 struct nvif_object *object)
+nvif_object_init(struct nvif_object *parent, u32 handle, u32 oclass,
+		 void *data, u32 size, struct nvif_object *object)
 {
-	struct ctor *ctor;
+	struct {
+		struct nvif_ioctl_v0 ioctl;
+		struct nvif_ioctl_new_v0 new;
+	} *args;
 	int ret = 0;
 
-	object->parent = NULL;
-	object->object = object;
-	nvif_object_ref(parent, &object->parent);
-	kref_init(&object->refcount);
+	object->client = NULL;
+	object->parent = parent;
 	object->handle = handle;
 	object->oclass = oclass;
-	object->data = NULL;
-	object->size = 0;
-	object->dtor = dtor;
 	object->map.ptr = NULL;
 	object->map.size = 0;
 
 	if (object->parent) {
-		if (!(ctor = kmalloc(sizeof(*ctor) + size, GFP_KERNEL))) {
+		if (!(args = kmalloc(sizeof(*args) + size, GFP_KERNEL))) {
 			nvif_object_fini(object);
 			return -ENOMEM;
 		}
-		object->data = ctor->new.data;
-		object->size = size;
-		memcpy(object->data, data, size);
 
-		ctor->ioctl.version = 0;
-		ctor->ioctl.type = NVIF_IOCTL_V0_NEW;
-		ctor->new.version = 0;
-		ctor->new.route = NVIF_IOCTL_V0_ROUTE_NVIF;
-		ctor->new.token = (unsigned long)(void *)object;
-		ctor->new.handle = handle;
-		ctor->new.oclass = oclass;
-
-		ret = nvif_object_ioctl(parent, ctor, sizeof(*ctor) +
-					object->size, &object->priv);
+		args->ioctl.version = 0;
+		args->ioctl.type = NVIF_IOCTL_V0_NEW;
+		args->new.version = 0;
+		args->new.route = parent->client->route;
+		args->new.token = (unsigned long)(void *)object;
+		args->new.handle = handle;
+		args->new.oclass = oclass;
+
+		memcpy(args->new.data, data, size);
+		ret = nvif_object_ioctl(parent, args, sizeof(*args) + size,
+					&object->priv);
+		memcpy(data, args->new.data, size);
+		kfree(args);
+		if (ret == 0)
+			object->client = parent->client;
 	}
 
 	if (ret)
 		nvif_object_fini(object);
 	return ret;
 }
-
-static void
-nvif_object_del(struct nvif_object *object)
-{
-	nvif_object_fini(object);
-	kfree(object);
-}
-
-int
-nvif_object_new(struct nvif_object *parent, u32 handle, u32 oclass,
-		void *data, u32 size, struct nvif_object **pobject)
-{
-	struct nvif_object *object = kzalloc(sizeof(*object), GFP_KERNEL);
-	if (object) {
-		int ret = nvif_object_init(parent, nvif_object_del, handle,
-					   oclass, data, size, object);
-		if (ret) {
-			kfree(object);
-			object = NULL;
-		}
-		*pobject = object;
-		return ret;
-	}
-	return -ENOMEM;
-}
-
-static void
-nvif_object_put(struct kref *kref)
-{
-	struct nvif_object *object =
-		container_of(kref, typeof(*object), refcount);
-	object->dtor(object);
-}
-
-void
-nvif_object_ref(struct nvif_object *object, struct nvif_object **pobject)
-{
-	if (object)
-		kref_get(&object->refcount);
-	if (*pobject)
-		kref_put(&(*pobject)->refcount, nvif_object_put);
-	*pobject = object;
-}