/*
 * 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/client.h>
#include <core/device.h>
#include <core/handle.h>
#include <core/notify.h>
#include <core/option.h>

#include <nvif/class.h>
#include <nvif/event.h>
#include <nvif/unpack.h>

struct nvkm_client_notify {
	struct nvkm_client *client;
	struct nvkm_notify n;
	u8 version;
	u8 size;
	union {
		struct nvif_notify_rep_v0 v0;
	} rep;
};

static int
nvkm_client_notify(struct nvkm_notify *n)
{
	struct nvkm_client_notify *notify = container_of(n, typeof(*notify), n);
	struct nvkm_client *client = notify->client;
	return client->ntfy(&notify->rep, notify->size, n->data, n->size);
}

int
nvkm_client_notify_put(struct nvkm_client *client, int index)
{
	if (index < ARRAY_SIZE(client->notify)) {
		if (client->notify[index]) {
			nvkm_notify_put(&client->notify[index]->n);
			return 0;
		}
	}
	return -ENOENT;
}

int
nvkm_client_notify_get(struct nvkm_client *client, int index)
{
	if (index < ARRAY_SIZE(client->notify)) {
		if (client->notify[index]) {
			nvkm_notify_get(&client->notify[index]->n);
			return 0;
		}
	}
	return -ENOENT;
}

int
nvkm_client_notify_del(struct nvkm_client *client, int index)
{
	if (index < ARRAY_SIZE(client->notify)) {
		if (client->notify[index]) {
			nvkm_notify_fini(&client->notify[index]->n);
			kfree(client->notify[index]);
			client->notify[index] = NULL;
			return 0;
		}
	}
	return -ENOENT;
}

int
nvkm_client_notify_new(struct nvkm_object *object,
		       struct nvkm_event *event, void *data, u32 size)
{
	struct nvkm_client *client = nvkm_client(object);
	struct nvkm_client_notify *notify;
	union {
		struct nvif_notify_req_v0 v0;
	} *req = data;
	u8  index, reply;
	int ret;

	for (index = 0; index < ARRAY_SIZE(client->notify); index++) {
		if (!client->notify[index])
			break;
	}

	if (index == ARRAY_SIZE(client->notify))
		return -ENOSPC;

	notify = kzalloc(sizeof(*notify), GFP_KERNEL);
	if (!notify)
		return -ENOMEM;

	nvif_ioctl(object, "notify new size %d\n", size);
	if (nvif_unpack(req->v0, 0, 0, true)) {
		nvif_ioctl(object, "notify new vers %d reply %d route %02x "
				   "token %llx\n", req->v0.version,
			   req->v0.reply, req->v0.route, req->v0.token);
		notify->version = req->v0.version;
		notify->size = sizeof(notify->rep.v0);
		notify->rep.v0.version = req->v0.version;
		notify->rep.v0.route = req->v0.route;
		notify->rep.v0.token = req->v0.token;
		reply = req->v0.reply;
	}

	if (ret == 0) {
		ret = nvkm_notify_init(object, event, nvkm_client_notify,
				       false, data, size, reply, &notify->n);
		if (ret == 0) {
			client->notify[index] = notify;
			notify->client = client;
			return index;
		}
	}

	kfree(notify);
	return ret;
}

static int
nvkm_client_mthd_devlist(struct nvkm_object *object, void *data, u32 size)
{
	union {
		struct nv_client_devlist_v0 v0;
	} *args = data;
	int ret;

	nvif_ioctl(object, "client devlist size %d\n", size);
	if (nvif_unpack(args->v0, 0, 0, true)) {
		nvif_ioctl(object, "client devlist vers %d count %d\n",
			   args->v0.version, args->v0.count);
		if (size == sizeof(args->v0.device[0]) * args->v0.count) {
			ret = nvkm_device_list(args->v0.device, args->v0.count);
			if (ret >= 0) {
				args->v0.count = ret;
				ret = 0;
			}
		} else {
			ret = -EINVAL;
		}
	}

	return ret;
}

static int
nvkm_client_mthd(struct nvkm_object *object, u32 mthd, void *data, u32 size)
{
	switch (mthd) {
	case NV_CLIENT_DEVLIST:
		return nvkm_client_mthd_devlist(object, data, size);
	default:
		break;
	}
	return -EINVAL;
}

static struct nvkm_oclass
nvkm_client_oclass = {
	.ofuncs = &(struct nvkm_ofuncs) {
		.mthd = nvkm_client_mthd,
	},
};

void
nvkm_client_remove(struct nvkm_client *client, struct nvkm_handle *object)
{
	if (!RB_EMPTY_NODE(&object->rb))
		rb_erase(&object->rb, &client->objroot);
}

bool
nvkm_client_insert(struct nvkm_client *client, struct nvkm_handle *object)
{
	struct rb_node **ptr = &client->objroot.rb_node;
	struct rb_node *parent = NULL;

	while (*ptr) {
		struct nvkm_handle *this =
			container_of(*ptr, typeof(*this), rb);
		parent = *ptr;
		if (object->handle < this->handle)
			ptr = &parent->rb_left;
		else
		if (object->handle > this->handle)
			ptr = &parent->rb_right;
		else
			return false;
	}

	rb_link_node(&object->rb, parent, ptr);
	rb_insert_color(&object->rb, &client->objroot);
	return true;
}

struct nvkm_handle *
nvkm_client_search(struct nvkm_client *client, u64 handle)
{
	struct rb_node *node = client->objroot.rb_node;
	while (node) {
		struct nvkm_handle *object =
			container_of(node, typeof(*object), rb);
		if (handle < object->handle)
			node = node->rb_left;
		else
		if (handle > object->handle)
			node = node->rb_right;
		else
			return object;
	}
	return NULL;
}

int
nvkm_client_fini(struct nvkm_client *client, bool suspend)
{
	struct nvkm_object *object = &client->namedb.parent.object;
	const char *name[2] = { "fini", "suspend" };
	int ret, i;
	nvif_trace(object, "%s running\n", name[suspend]);
	nvif_trace(object, "%s notify\n", name[suspend]);
	for (i = 0; i < ARRAY_SIZE(client->notify); i++)
		nvkm_client_notify_put(client, i);
	nvif_trace(object, "%s object\n", name[suspend]);
	ret = nvkm_handle_fini(client->root, suspend);
	nvif_trace(object, "%s completed with %d\n", name[suspend], ret);
	return ret;
}

int
nvkm_client_init(struct nvkm_client *client)
{
	struct nvkm_object *object = &client->namedb.parent.object;
	int ret;
	nvif_trace(object, "init running\n");
	ret = nvkm_handle_init(client->root);
	nvif_trace(object, "init completed with %d\n", ret);
	return ret;
}

void
nvkm_client_del(struct nvkm_client **pclient)
{
	struct nvkm_client *client = *pclient;
	int i;
	if (client) {
		nvkm_client_fini(client, false);
		for (i = 0; i < ARRAY_SIZE(client->notify); i++)
			nvkm_client_notify_del(client, i);
		nvkm_handle_destroy(client->root);
		nvkm_namedb_destroy(&client->namedb);
		*pclient = NULL;
	}
}

static struct nvkm_oclass
nvkm_client_sclass[] = {
	{ NV_DEVICE, &nvkm_udevice_ofuncs },
	{}
};

int
nvkm_client_new(const char *name, u64 device, const char *cfg,
		const char *dbg, struct nvkm_client **pclient)
{
	struct nvkm_client *client;
	int ret;

	ret = nvkm_namedb_create(NULL, NULL, &nvkm_client_oclass,
				 NV_CLIENT_CLASS, nvkm_client_sclass,
				 0, &client);
	*pclient = client;
	if (ret)
		return ret;

	ret = nvkm_handle_create(nv_object(client), ~0, ~0, nv_object(client),
				 &client->root);
	if (ret)
		return ret;

	/* prevent init/fini being called, os in in charge of this */
	atomic_set(&nv_object(client)->usecount, 2);

	client->device = device;
	snprintf(client->name, sizeof(client->name), "%s", name);
	client->debug = nvkm_dbgopt(dbg, "CLIENT");
	client->objroot = RB_ROOT;
	return 0;
}

const char *
nvkm_client_name(void *obj)
{
	const char *client_name = "unknown";
	struct nvkm_client *client = nvkm_client(obj);
	if (client)
		client_name = client->name;
	return client_name;
}