/*
 * Copyright 2014 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 <bskeggs@redhat.com>
 */

#include <nvif/object.h>
#include <nvif/client.h>
#include <nvif/driver.h>
#include <nvif/ioctl.h>

int
nvif_object_ioctl(struct nvif_object *object, void *data, u32 size, void **hack)
{
	struct nvif_client *client = object->client;
	union {
		struct nvif_ioctl_v0 v0;
	} *args = data;

	if (size >= sizeof(*args) && args->v0.version == 0) {
		if (object != &client->object)
			args->v0.object = nvif_handle(object);
		else
			args->v0.object = 0;
	} else
		return -ENOSYS;

	return client->driver->ioctl(client->object.priv, data, size, hack);
}

void
nvif_object_sclass_put(struct nvif_sclass **psclass)
{
	kfree(*psclass);
	*psclass = NULL;
}

int
nvif_object_sclass_get(struct nvif_object *object, struct nvif_sclass **psclass)
{
	struct {
		struct nvif_ioctl_v0 ioctl;
		struct nvif_ioctl_sclass_v0 sclass;
	} *args = NULL;
	int ret, cnt = 0, i;
	u32 size;

	while (1) {
		size = sizeof(*args) + cnt * sizeof(args->sclass.oclass[0]);
		if (!(args = kmalloc(size, GFP_KERNEL)))
			return -ENOMEM;
		args->ioctl.version = 0;
		args->ioctl.type = NVIF_IOCTL_V0_SCLASS;
		args->sclass.version = 0;
		args->sclass.count = cnt;

		ret = nvif_object_ioctl(object, args, size, NULL);
		if (ret == 0 && args->sclass.count <= cnt)
			break;
		cnt = args->sclass.count;
		kfree(args);
		if (ret != 0)
			return ret;
	}

	*psclass = kcalloc(args->sclass.count, sizeof(**psclass), GFP_KERNEL);
	if (*psclass) {
		for (i = 0; i < args->sclass.count; i++) {
			(*psclass)[i].oclass = args->sclass.oclass[i].oclass;
			(*psclass)[i].minver = args->sclass.oclass[i].minver;
			(*psclass)[i].maxver = args->sclass.oclass[i].maxver;
		}
		ret = args->sclass.count;
	} else {
		ret = -ENOMEM;
	}

	kfree(args);
	return ret;
}

int
nvif_object_mthd(struct nvif_object *object, u32 mthd, void *data, u32 size)
{
	struct {
		struct nvif_ioctl_v0 ioctl;
		struct nvif_ioctl_mthd_v0 mthd;
	} *args;
	u32 args_size;
	u8 stack[128];
	int ret;

	if (check_add_overflow(sizeof(*args), size, &args_size))
		return -ENOMEM;

	if (args_size > sizeof(stack)) {
		args = kmalloc(args_size, GFP_KERNEL);
		if (!args)
			return -ENOMEM;
	} else {
		args = (void *)stack;
	}
	args->ioctl.version = 0;
	args->ioctl.type = NVIF_IOCTL_V0_MTHD;
	args->mthd.version = 0;
	args->mthd.method = mthd;

	memcpy(args->mthd.data, data, size);
	ret = nvif_object_ioctl(object, args, args_size, NULL);
	memcpy(data, args->mthd.data, size);
	if (args != (void *)stack)
		kfree(args);
	return ret;
}

void
nvif_object_unmap_handle(struct nvif_object *object)
{
	struct {
		struct nvif_ioctl_v0 ioctl;
		struct nvif_ioctl_unmap unmap;
	} args = {
		.ioctl.type = NVIF_IOCTL_V0_UNMAP,
	};

	nvif_object_ioctl(object, &args, sizeof(args), NULL);
}

int
nvif_object_map_handle(struct nvif_object *object, void *argv, u32 argc,
		       u64 *handle, u64 *length)
{
	struct {
		struct nvif_ioctl_v0 ioctl;
		struct nvif_ioctl_map_v0 map;
	} *args;
	u32 argn = sizeof(*args) + argc;
	int ret, maptype;

	if (!(args = kzalloc(argn, GFP_KERNEL)))
		return -ENOMEM;
	args->ioctl.type = NVIF_IOCTL_V0_MAP;
	memcpy(args->map.data, argv, argc);

	ret = nvif_object_ioctl(object, args, argn, NULL);
	*handle = args->map.handle;
	*length = args->map.length;
	maptype = args->map.type;
	kfree(args);
	return ret ? ret : (maptype == NVIF_IOCTL_MAP_V0_IO);
}

void
nvif_object_unmap(struct nvif_object *object)
{
	struct nvif_client *client = object->client;
	if (object->map.ptr) {
		if (object->map.size) {
			client->driver->unmap(client, object->map.ptr,
						      object->map.size);
			object->map.size = 0;
		}
		object->map.ptr = NULL;
		nvif_object_unmap_handle(object);
	}
}

int
nvif_object_map(struct nvif_object *object, void *argv, u32 argc)
{
	struct nvif_client *client = object->client;
	u64 handle, length;
	int ret = nvif_object_map_handle(object, argv, argc, &handle, &length);
	if (ret >= 0) {
		if (ret) {
			object->map.ptr = client->driver->map(client,
							      handle,
							      length);
			if (ret = -ENOMEM, object->map.ptr) {
				object->map.size = length;
				return 0;
			}
		} else {
			object->map.ptr = (void *)(unsigned long)handle;
			return 0;
		}
		nvif_object_unmap_handle(object);
	}
	return ret;
}

void
nvif_object_dtor(struct nvif_object *object)
{
	struct {
		struct nvif_ioctl_v0 ioctl;
		struct nvif_ioctl_del del;
	} args = {
		.ioctl.type = NVIF_IOCTL_V0_DEL,
	};

	if (!nvif_object_constructed(object))
		return;

	nvif_object_unmap(object);
	nvif_object_ioctl(object, &args, sizeof(args), NULL);
	object->client = NULL;
}

int
nvif_object_ctor(struct nvif_object *parent, const char *name, u32 handle,
		 s32 oclass, void *data, u32 size, struct nvif_object *object)
{
	struct {
		struct nvif_ioctl_v0 ioctl;
		struct nvif_ioctl_new_v0 new;
	} *args;
	int ret = 0;

	object->client = NULL;
	object->name = name ? name : "nvifObject";
	object->handle = handle;
	object->oclass = oclass;
	object->map.ptr = NULL;
	object->map.size = 0;

	if (parent) {
		u32 args_size;

		if (check_add_overflow(sizeof(*args), size, &args_size)) {
			nvif_object_dtor(object);
			return -ENOMEM;
		}

		args = kmalloc(args_size, GFP_KERNEL);
		if (!args) {
			nvif_object_dtor(object);
			return -ENOMEM;
		}

		object->parent = parent->parent;

		args->ioctl.version = 0;
		args->ioctl.type = NVIF_IOCTL_V0_NEW;
		args->new.version = 0;
		args->new.object = nvif_handle(object);
		args->new.handle = handle;
		args->new.oclass = oclass;

		memcpy(args->new.data, data, size);
		ret = nvif_object_ioctl(parent, args, args_size, &object->priv);
		memcpy(data, args->new.data, size);
		kfree(args);
		if (ret == 0)
			object->client = parent->client;
	}

	if (ret)
		nvif_object_dtor(object);
	return ret;
}